isci: Add decode for SMP request retry error condition
[linux-2.6.git] / drivers / scsi / isci / request.c
1 /*
2  * This file is provided under a dual BSD/GPLv2 license.  When using or
3  * redistributing this file, you may do so under either license.
4  *
5  * GPL LICENSE SUMMARY
6  *
7  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of version 2 of the GNU General Public License as
11  * published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * General Public License for more details.
17  *
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19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
21  * The full GNU General Public License is included in this distribution
22  * in the file called LICENSE.GPL.
23  *
24  * BSD LICENSE
25  *
26  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
27  * All rights reserved.
28  *
29  * Redistribution and use in source and binary forms, with or without
30  * modification, are permitted provided that the following conditions
31  * are met:
32  *
33  *   * Redistributions of source code must retain the above copyright
34  *     notice, this list of conditions and the following disclaimer.
35  *   * Redistributions in binary form must reproduce the above copyright
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37  *     the documentation and/or other materials provided with the
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39  *   * Neither the name of Intel Corporation nor the names of its
40  *     contributors may be used to endorse or promote products derived
41  *     from this software without specific prior written permission.
42  *
43  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
44  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
45  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
46  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
47  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
48  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
49  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
50  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
51  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
52  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
53  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
54  */
55
56 #include "isci.h"
57 #include "task.h"
58 #include "request.h"
59 #include "sata.h"
60 #include "scu_completion_codes.h"
61 #include "scu_event_codes.h"
62 #include "sas.h"
63
64 /**
65  * This method returns the sgl element pair for the specificed sgl_pair index.
66  * @sci_req: This parameter specifies the IO request for which to retrieve
67  *    the Scatter-Gather List element pair.
68  * @sgl_pair_index: This parameter specifies the index into the SGL element
69  *    pair to be retrieved.
70  *
71  * This method returns a pointer to an struct scu_sgl_element_pair.
72  */
73 static struct scu_sgl_element_pair *scic_sds_request_get_sgl_element_pair(
74         struct scic_sds_request *sci_req,
75         u32 sgl_pair_index
76         ) {
77         struct scu_task_context *task_context;
78
79         task_context = (struct scu_task_context *)sci_req->task_context_buffer;
80
81         if (sgl_pair_index == 0) {
82                 return &task_context->sgl_pair_ab;
83         } else if (sgl_pair_index == 1) {
84                 return &task_context->sgl_pair_cd;
85         }
86
87         return &sci_req->sg_table[sgl_pair_index - 2];
88 }
89
90 /**
91  * This function will build the SGL list for an IO request.
92  * @sci_req: This parameter specifies the IO request for which to build
93  *    the Scatter-Gather List.
94  *
95  */
96 static void scic_sds_request_build_sgl(struct scic_sds_request *sds_request)
97 {
98         struct isci_request *isci_request = sci_req_to_ireq(sds_request);
99         struct isci_host *isci_host = isci_request->isci_host;
100         struct sas_task *task = isci_request_access_task(isci_request);
101         struct scatterlist *sg = NULL;
102         dma_addr_t dma_addr;
103         u32 sg_idx = 0;
104         struct scu_sgl_element_pair *scu_sg   = NULL;
105         struct scu_sgl_element_pair *prev_sg  = NULL;
106
107         if (task->num_scatter > 0) {
108                 sg = task->scatter;
109
110                 while (sg) {
111                         scu_sg = scic_sds_request_get_sgl_element_pair(
112                                         sds_request,
113                                         sg_idx);
114
115                         SCU_SGL_COPY(scu_sg->A, sg);
116
117                         sg = sg_next(sg);
118
119                         if (sg) {
120                                 SCU_SGL_COPY(scu_sg->B, sg);
121                                 sg = sg_next(sg);
122                         } else
123                                 SCU_SGL_ZERO(scu_sg->B);
124
125                         if (prev_sg) {
126                                 dma_addr =
127                                         scic_io_request_get_dma_addr(
128                                                         sds_request,
129                                                         scu_sg);
130
131                                 prev_sg->next_pair_upper =
132                                         upper_32_bits(dma_addr);
133                                 prev_sg->next_pair_lower =
134                                         lower_32_bits(dma_addr);
135                         }
136
137                         prev_sg = scu_sg;
138                         sg_idx++;
139                 }
140         } else {        /* handle when no sg */
141                 scu_sg = scic_sds_request_get_sgl_element_pair(sds_request,
142                                                                sg_idx);
143
144                 dma_addr = dma_map_single(&isci_host->pdev->dev,
145                                           task->scatter,
146                                           task->total_xfer_len,
147                                           task->data_dir);
148
149                 isci_request->zero_scatter_daddr = dma_addr;
150
151                 scu_sg->A.length = task->total_xfer_len;
152                 scu_sg->A.address_upper = upper_32_bits(dma_addr);
153                 scu_sg->A.address_lower = lower_32_bits(dma_addr);
154         }
155
156         if (scu_sg) {
157                 scu_sg->next_pair_upper = 0;
158                 scu_sg->next_pair_lower = 0;
159         }
160 }
161
162 static void scic_sds_io_request_build_ssp_command_iu(struct scic_sds_request *sci_req)
163 {
164         struct ssp_cmd_iu *cmd_iu;
165         struct isci_request *ireq = sci_req_to_ireq(sci_req);
166         struct sas_task *task = isci_request_access_task(ireq);
167
168         cmd_iu = &sci_req->ssp.cmd;
169
170         memcpy(cmd_iu->LUN, task->ssp_task.LUN, 8);
171         cmd_iu->add_cdb_len = 0;
172         cmd_iu->_r_a = 0;
173         cmd_iu->_r_b = 0;
174         cmd_iu->en_fburst = 0; /* unsupported */
175         cmd_iu->task_prio = task->ssp_task.task_prio;
176         cmd_iu->task_attr = task->ssp_task.task_attr;
177         cmd_iu->_r_c = 0;
178
179         sci_swab32_cpy(&cmd_iu->cdb, task->ssp_task.cdb,
180                        sizeof(task->ssp_task.cdb) / sizeof(u32));
181 }
182
183 static void scic_sds_task_request_build_ssp_task_iu(struct scic_sds_request *sci_req)
184 {
185         struct ssp_task_iu *task_iu;
186         struct isci_request *ireq = sci_req_to_ireq(sci_req);
187         struct sas_task *task = isci_request_access_task(ireq);
188         struct isci_tmf *isci_tmf = isci_request_access_tmf(ireq);
189
190         task_iu = &sci_req->ssp.tmf;
191
192         memset(task_iu, 0, sizeof(struct ssp_task_iu));
193
194         memcpy(task_iu->LUN, task->ssp_task.LUN, 8);
195
196         task_iu->task_func = isci_tmf->tmf_code;
197         task_iu->task_tag =
198                 (ireq->ttype == tmf_task) ?
199                 isci_tmf->io_tag :
200                 SCI_CONTROLLER_INVALID_IO_TAG;
201 }
202
203 /**
204  * This method is will fill in the SCU Task Context for any type of SSP request.
205  * @sci_req:
206  * @task_context:
207  *
208  */
209 static void scu_ssp_reqeust_construct_task_context(
210         struct scic_sds_request *sds_request,
211         struct scu_task_context *task_context)
212 {
213         dma_addr_t dma_addr;
214         struct scic_sds_remote_device *target_device;
215         struct scic_sds_port *target_port;
216
217         target_device = scic_sds_request_get_device(sds_request);
218         target_port = scic_sds_request_get_port(sds_request);
219
220         /* Fill in the TC with the its required data */
221         task_context->abort = 0;
222         task_context->priority = 0;
223         task_context->initiator_request = 1;
224         task_context->connection_rate = target_device->connection_rate;
225         task_context->protocol_engine_index =
226                 scic_sds_controller_get_protocol_engine_group(controller);
227         task_context->logical_port_index =
228                 scic_sds_port_get_index(target_port);
229         task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SSP;
230         task_context->valid = SCU_TASK_CONTEXT_VALID;
231         task_context->context_type = SCU_TASK_CONTEXT_TYPE;
232
233         task_context->remote_node_index =
234                 scic_sds_remote_device_get_index(sds_request->target_device);
235         task_context->command_code = 0;
236
237         task_context->link_layer_control = 0;
238         task_context->do_not_dma_ssp_good_response = 1;
239         task_context->strict_ordering = 0;
240         task_context->control_frame = 0;
241         task_context->timeout_enable = 0;
242         task_context->block_guard_enable = 0;
243
244         task_context->address_modifier = 0;
245
246         /* task_context->type.ssp.tag = sci_req->io_tag; */
247         task_context->task_phase = 0x01;
248
249         if (sds_request->was_tag_assigned_by_user) {
250                 /*
251                  * Build the task context now since we have already read
252                  * the data
253                  */
254                 sds_request->post_context =
255                         (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
256                          (scic_sds_controller_get_protocol_engine_group(
257                                                         controller) <<
258                           SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
259                          (scic_sds_port_get_index(target_port) <<
260                           SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
261                          scic_sds_io_tag_get_index(sds_request->io_tag));
262         } else {
263                 /*
264                  * Build the task context now since we have already read
265                  * the data
266                  *
267                  * I/O tag index is not assigned because we have to wait
268                  * until we get a TCi
269                  */
270                 sds_request->post_context =
271                         (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
272                          (scic_sds_controller_get_protocol_engine_group(
273                                                         owning_controller) <<
274                           SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
275                          (scic_sds_port_get_index(target_port) <<
276                           SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT));
277         }
278
279         /*
280          * Copy the physical address for the command buffer to the
281          * SCU Task Context
282          */
283         dma_addr = scic_io_request_get_dma_addr(sds_request,
284                                                 &sds_request->ssp.cmd);
285
286         task_context->command_iu_upper = upper_32_bits(dma_addr);
287         task_context->command_iu_lower = lower_32_bits(dma_addr);
288
289         /*
290          * Copy the physical address for the response buffer to the
291          * SCU Task Context
292          */
293         dma_addr = scic_io_request_get_dma_addr(sds_request,
294                                                 &sds_request->ssp.rsp);
295
296         task_context->response_iu_upper = upper_32_bits(dma_addr);
297         task_context->response_iu_lower = lower_32_bits(dma_addr);
298 }
299
300 /**
301  * This method is will fill in the SCU Task Context for a SSP IO request.
302  * @sci_req:
303  *
304  */
305 static void scu_ssp_io_request_construct_task_context(
306         struct scic_sds_request *sci_req,
307         enum dma_data_direction dir,
308         u32 len)
309 {
310         struct scu_task_context *task_context;
311
312         task_context = scic_sds_request_get_task_context(sci_req);
313
314         scu_ssp_reqeust_construct_task_context(sci_req, task_context);
315
316         task_context->ssp_command_iu_length =
317                 sizeof(struct ssp_cmd_iu) / sizeof(u32);
318         task_context->type.ssp.frame_type = SSP_COMMAND;
319
320         switch (dir) {
321         case DMA_FROM_DEVICE:
322         case DMA_NONE:
323         default:
324                 task_context->task_type = SCU_TASK_TYPE_IOREAD;
325                 break;
326         case DMA_TO_DEVICE:
327                 task_context->task_type = SCU_TASK_TYPE_IOWRITE;
328                 break;
329         }
330
331         task_context->transfer_length_bytes = len;
332
333         if (task_context->transfer_length_bytes > 0)
334                 scic_sds_request_build_sgl(sci_req);
335 }
336
337 /**
338  * This method will fill in the SCU Task Context for a SSP Task request.  The
339  *    following important settings are utilized: -# priority ==
340  *    SCU_TASK_PRIORITY_HIGH.  This ensures that the task request is issued
341  *    ahead of other task destined for the same Remote Node. -# task_type ==
342  *    SCU_TASK_TYPE_IOREAD.  This simply indicates that a normal request type
343  *    (i.e. non-raw frame) is being utilized to perform task management. -#
344  *    control_frame == 1.  This ensures that the proper endianess is set so
345  *    that the bytes are transmitted in the right order for a task frame.
346  * @sci_req: This parameter specifies the task request object being
347  *    constructed.
348  *
349  */
350 static void scu_ssp_task_request_construct_task_context(
351         struct scic_sds_request *sci_req)
352 {
353         struct scu_task_context *task_context;
354
355         task_context = scic_sds_request_get_task_context(sci_req);
356
357         scu_ssp_reqeust_construct_task_context(sci_req, task_context);
358
359         task_context->control_frame                = 1;
360         task_context->priority                     = SCU_TASK_PRIORITY_HIGH;
361         task_context->task_type                    = SCU_TASK_TYPE_RAW_FRAME;
362         task_context->transfer_length_bytes        = 0;
363         task_context->type.ssp.frame_type          = SSP_TASK;
364         task_context->ssp_command_iu_length =
365                 sizeof(struct ssp_task_iu) / sizeof(u32);
366 }
367
368 /**
369  * This method is will fill in the SCU Task Context for any type of SATA
370  *    request.  This is called from the various SATA constructors.
371  * @sci_req: The general IO request object which is to be used in
372  *    constructing the SCU task context.
373  * @task_context: The buffer pointer for the SCU task context which is being
374  *    constructed.
375  *
376  * The general io request construction is complete. The buffer assignment for
377  * the command buffer is complete. none Revisit task context construction to
378  * determine what is common for SSP/SMP/STP task context structures.
379  */
380 static void scu_sata_reqeust_construct_task_context(
381         struct scic_sds_request *sci_req,
382         struct scu_task_context *task_context)
383 {
384         dma_addr_t dma_addr;
385         struct scic_sds_remote_device *target_device;
386         struct scic_sds_port *target_port;
387
388         target_device = scic_sds_request_get_device(sci_req);
389         target_port = scic_sds_request_get_port(sci_req);
390
391         /* Fill in the TC with the its required data */
392         task_context->abort = 0;
393         task_context->priority = SCU_TASK_PRIORITY_NORMAL;
394         task_context->initiator_request = 1;
395         task_context->connection_rate = target_device->connection_rate;
396         task_context->protocol_engine_index =
397                 scic_sds_controller_get_protocol_engine_group(controller);
398         task_context->logical_port_index =
399                 scic_sds_port_get_index(target_port);
400         task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_STP;
401         task_context->valid = SCU_TASK_CONTEXT_VALID;
402         task_context->context_type = SCU_TASK_CONTEXT_TYPE;
403
404         task_context->remote_node_index =
405                 scic_sds_remote_device_get_index(sci_req->target_device);
406         task_context->command_code = 0;
407
408         task_context->link_layer_control = 0;
409         task_context->do_not_dma_ssp_good_response = 1;
410         task_context->strict_ordering = 0;
411         task_context->control_frame = 0;
412         task_context->timeout_enable = 0;
413         task_context->block_guard_enable = 0;
414
415         task_context->address_modifier = 0;
416         task_context->task_phase = 0x01;
417
418         task_context->ssp_command_iu_length =
419                 (sizeof(struct host_to_dev_fis) - sizeof(u32)) / sizeof(u32);
420
421         /* Set the first word of the H2D REG FIS */
422         task_context->type.words[0] = *(u32 *)&sci_req->stp.cmd;
423
424         if (sci_req->was_tag_assigned_by_user) {
425                 /*
426                  * Build the task context now since we have already read
427                  * the data
428                  */
429                 sci_req->post_context =
430                         (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
431                          (scic_sds_controller_get_protocol_engine_group(
432                                                         controller) <<
433                           SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
434                          (scic_sds_port_get_index(target_port) <<
435                           SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
436                          scic_sds_io_tag_get_index(sci_req->io_tag));
437         } else {
438                 /*
439                  * Build the task context now since we have already read
440                  * the data.
441                  * I/O tag index is not assigned because we have to wait
442                  * until we get a TCi.
443                  */
444                 sci_req->post_context =
445                         (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
446                          (scic_sds_controller_get_protocol_engine_group(
447                                                         controller) <<
448                           SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
449                          (scic_sds_port_get_index(target_port) <<
450                           SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT));
451         }
452
453         /*
454          * Copy the physical address for the command buffer to the SCU Task
455          * Context. We must offset the command buffer by 4 bytes because the
456          * first 4 bytes are transfered in the body of the TC.
457          */
458         dma_addr = scic_io_request_get_dma_addr(sci_req,
459                                                 ((char *) &sci_req->stp.cmd) +
460                                                 sizeof(u32));
461
462         task_context->command_iu_upper = upper_32_bits(dma_addr);
463         task_context->command_iu_lower = lower_32_bits(dma_addr);
464
465         /* SATA Requests do not have a response buffer */
466         task_context->response_iu_upper = 0;
467         task_context->response_iu_lower = 0;
468 }
469
470
471
472 /**
473  * scu_stp_raw_request_construct_task_context -
474  * @sci_req: This parameter specifies the STP request object for which to
475  *    construct a RAW command frame task context.
476  * @task_context: This parameter specifies the SCU specific task context buffer
477  *    to construct.
478  *
479  * This method performs the operations common to all SATA/STP requests
480  * utilizing the raw frame method. none
481  */
482 static void scu_stp_raw_request_construct_task_context(struct scic_sds_stp_request *stp_req,
483                                                        struct scu_task_context *task_context)
484 {
485         struct scic_sds_request *sci_req = to_sci_req(stp_req);
486
487         scu_sata_reqeust_construct_task_context(sci_req, task_context);
488
489         task_context->control_frame         = 0;
490         task_context->priority              = SCU_TASK_PRIORITY_NORMAL;
491         task_context->task_type             = SCU_TASK_TYPE_SATA_RAW_FRAME;
492         task_context->type.stp.fis_type     = FIS_REGH2D;
493         task_context->transfer_length_bytes = sizeof(struct host_to_dev_fis) - sizeof(u32);
494 }
495
496 static enum sci_status
497 scic_sds_stp_pio_request_construct(struct scic_sds_request *sci_req,
498                                    bool copy_rx_frame)
499 {
500         struct scic_sds_stp_request *stp_req = &sci_req->stp.req;
501         struct scic_sds_stp_pio_request *pio = &stp_req->type.pio;
502
503         scu_stp_raw_request_construct_task_context(stp_req,
504                                                    sci_req->task_context_buffer);
505
506         pio->current_transfer_bytes = 0;
507         pio->ending_error = 0;
508         pio->ending_status = 0;
509
510         pio->request_current.sgl_offset = 0;
511         pio->request_current.sgl_set = SCU_SGL_ELEMENT_PAIR_A;
512
513         if (copy_rx_frame) {
514                 scic_sds_request_build_sgl(sci_req);
515                 /* Since the IO request copy of the TC contains the same data as
516                  * the actual TC this pointer is vaild for either.
517                  */
518                 pio->request_current.sgl_pair = &sci_req->task_context_buffer->sgl_pair_ab;
519         } else {
520                 /* The user does not want the data copied to the SGL buffer location */
521                 pio->request_current.sgl_pair = NULL;
522         }
523
524         return SCI_SUCCESS;
525 }
526
527 /**
528  *
529  * @sci_req: This parameter specifies the request to be constructed as an
530  *    optimized request.
531  * @optimized_task_type: This parameter specifies whether the request is to be
532  *    an UDMA request or a NCQ request. - A value of 0 indicates UDMA. - A
533  *    value of 1 indicates NCQ.
534  *
535  * This method will perform request construction common to all types of STP
536  * requests that are optimized by the silicon (i.e. UDMA, NCQ). This method
537  * returns an indication as to whether the construction was successful.
538  */
539 static void scic_sds_stp_optimized_request_construct(struct scic_sds_request *sci_req,
540                                                      u8 optimized_task_type,
541                                                      u32 len,
542                                                      enum dma_data_direction dir)
543 {
544         struct scu_task_context *task_context = sci_req->task_context_buffer;
545
546         /* Build the STP task context structure */
547         scu_sata_reqeust_construct_task_context(sci_req, task_context);
548
549         /* Copy over the SGL elements */
550         scic_sds_request_build_sgl(sci_req);
551
552         /* Copy over the number of bytes to be transfered */
553         task_context->transfer_length_bytes = len;
554
555         if (dir == DMA_TO_DEVICE) {
556                 /*
557                  * The difference between the DMA IN and DMA OUT request task type
558                  * values are consistent with the difference between FPDMA READ
559                  * and FPDMA WRITE values.  Add the supplied task type parameter
560                  * to this difference to set the task type properly for this
561                  * DATA OUT (WRITE) case. */
562                 task_context->task_type = optimized_task_type + (SCU_TASK_TYPE_DMA_OUT
563                                                                  - SCU_TASK_TYPE_DMA_IN);
564         } else {
565                 /*
566                  * For the DATA IN (READ) case, simply save the supplied
567                  * optimized task type. */
568                 task_context->task_type = optimized_task_type;
569         }
570 }
571
572
573
574 static enum sci_status
575 scic_io_request_construct_sata(struct scic_sds_request *sci_req,
576                                u32 len,
577                                enum dma_data_direction dir,
578                                bool copy)
579 {
580         enum sci_status status = SCI_SUCCESS;
581         struct isci_request *ireq = sci_req_to_ireq(sci_req);
582         struct sas_task *task = isci_request_access_task(ireq);
583
584         /* check for management protocols */
585         if (ireq->ttype == tmf_task) {
586                 struct isci_tmf *tmf = isci_request_access_tmf(ireq);
587
588                 if (tmf->tmf_code == isci_tmf_sata_srst_high ||
589                     tmf->tmf_code == isci_tmf_sata_srst_low) {
590                         scu_stp_raw_request_construct_task_context(&sci_req->stp.req,
591                                                                    sci_req->task_context_buffer);
592                         return SCI_SUCCESS;
593                 } else {
594                         dev_err(scic_to_dev(sci_req->owning_controller),
595                                 "%s: Request 0x%p received un-handled SAT "
596                                 "management protocol 0x%x.\n",
597                                 __func__, sci_req, tmf->tmf_code);
598
599                         return SCI_FAILURE;
600                 }
601         }
602
603         if (!sas_protocol_ata(task->task_proto)) {
604                 dev_err(scic_to_dev(sci_req->owning_controller),
605                         "%s: Non-ATA protocol in SATA path: 0x%x\n",
606                         __func__,
607                         task->task_proto);
608                 return SCI_FAILURE;
609
610         }
611
612         /* non data */
613         if (task->data_dir == DMA_NONE) {
614                 scu_stp_raw_request_construct_task_context(&sci_req->stp.req,
615                                                            sci_req->task_context_buffer);
616                 return SCI_SUCCESS;
617         }
618
619         /* NCQ */
620         if (task->ata_task.use_ncq) {
621                 scic_sds_stp_optimized_request_construct(sci_req,
622                                                          SCU_TASK_TYPE_FPDMAQ_READ,
623                                                          len, dir);
624                 return SCI_SUCCESS;
625         }
626
627         /* DMA */
628         if (task->ata_task.dma_xfer) {
629                 scic_sds_stp_optimized_request_construct(sci_req,
630                                                          SCU_TASK_TYPE_DMA_IN,
631                                                          len, dir);
632                 return SCI_SUCCESS;
633         } else /* PIO */
634                 return scic_sds_stp_pio_request_construct(sci_req, copy);
635
636         return status;
637 }
638
639 static enum sci_status scic_io_request_construct_basic_ssp(struct scic_sds_request *sci_req)
640 {
641         struct isci_request *ireq = sci_req_to_ireq(sci_req);
642         struct sas_task *task = isci_request_access_task(ireq);
643
644         sci_req->protocol = SCIC_SSP_PROTOCOL;
645
646         scu_ssp_io_request_construct_task_context(sci_req,
647                                                   task->data_dir,
648                                                   task->total_xfer_len);
649
650         scic_sds_io_request_build_ssp_command_iu(sci_req);
651
652         sci_change_state(&sci_req->sm, SCI_REQ_CONSTRUCTED);
653
654         return SCI_SUCCESS;
655 }
656
657 enum sci_status scic_task_request_construct_ssp(
658         struct scic_sds_request *sci_req)
659 {
660         /* Construct the SSP Task SCU Task Context */
661         scu_ssp_task_request_construct_task_context(sci_req);
662
663         /* Fill in the SSP Task IU */
664         scic_sds_task_request_build_ssp_task_iu(sci_req);
665
666         sci_change_state(&sci_req->sm, SCI_REQ_CONSTRUCTED);
667
668         return SCI_SUCCESS;
669 }
670
671 static enum sci_status scic_io_request_construct_basic_sata(struct scic_sds_request *sci_req)
672 {
673         enum sci_status status;
674         bool copy = false;
675         struct isci_request *isci_request = sci_req_to_ireq(sci_req);
676         struct sas_task *task = isci_request_access_task(isci_request);
677
678         sci_req->protocol = SCIC_STP_PROTOCOL;
679
680         copy = (task->data_dir == DMA_NONE) ? false : true;
681
682         status = scic_io_request_construct_sata(sci_req,
683                                                 task->total_xfer_len,
684                                                 task->data_dir,
685                                                 copy);
686
687         if (status == SCI_SUCCESS)
688                 sci_change_state(&sci_req->sm, SCI_REQ_CONSTRUCTED);
689
690         return status;
691 }
692
693 enum sci_status scic_task_request_construct_sata(struct scic_sds_request *sci_req)
694 {
695         enum sci_status status = SCI_SUCCESS;
696         struct isci_request *ireq = sci_req_to_ireq(sci_req);
697
698         /* check for management protocols */
699         if (ireq->ttype == tmf_task) {
700                 struct isci_tmf *tmf = isci_request_access_tmf(ireq);
701
702                 if (tmf->tmf_code == isci_tmf_sata_srst_high ||
703                     tmf->tmf_code == isci_tmf_sata_srst_low) {
704                         scu_stp_raw_request_construct_task_context(&sci_req->stp.req,
705                                                                    sci_req->task_context_buffer);
706                 } else {
707                         dev_err(scic_to_dev(sci_req->owning_controller),
708                                 "%s: Request 0x%p received un-handled SAT "
709                                 "Protocol 0x%x.\n",
710                                 __func__, sci_req, tmf->tmf_code);
711
712                         return SCI_FAILURE;
713                 }
714         }
715
716         if (status != SCI_SUCCESS)
717                 return status;
718         sci_change_state(&sci_req->sm, SCI_REQ_CONSTRUCTED);
719
720         return status;
721 }
722
723 /**
724  * sci_req_tx_bytes - bytes transferred when reply underruns request
725  * @sci_req: request that was terminated early
726  */
727 #define SCU_TASK_CONTEXT_SRAM 0x200000
728 static u32 sci_req_tx_bytes(struct scic_sds_request *sci_req)
729 {
730         struct scic_sds_controller *scic = sci_req->owning_controller;
731         u32 ret_val = 0;
732
733         if (readl(&scic->smu_registers->address_modifier) == 0) {
734                 void __iomem *scu_reg_base = scic->scu_registers;
735
736                 /* get the bytes of data from the Address == BAR1 + 20002Ch + (256*TCi) where
737                  *   BAR1 is the scu_registers
738                  *   0x20002C = 0x200000 + 0x2c
739                  *            = start of task context SRAM + offset of (type.ssp.data_offset)
740                  *   TCi is the io_tag of struct scic_sds_request
741                  */
742                 ret_val = readl(scu_reg_base +
743                                 (SCU_TASK_CONTEXT_SRAM + offsetof(struct scu_task_context, type.ssp.data_offset)) +
744                                 ((sizeof(struct scu_task_context)) * scic_sds_io_tag_get_index(sci_req->io_tag)));
745         }
746
747         return ret_val;
748 }
749
750 enum sci_status scic_sds_request_start(struct scic_sds_request *sci_req)
751 {
752         struct scic_sds_controller *scic = sci_req->owning_controller;
753         struct scu_task_context *task_context;
754         enum sci_base_request_states state;
755
756         if (sci_req->device_sequence !=
757             scic_sds_remote_device_get_sequence(sci_req->target_device))
758                 return SCI_FAILURE;
759
760         state = sci_req->sm.current_state_id;
761         if (state != SCI_REQ_CONSTRUCTED) {
762                 dev_warn(scic_to_dev(scic),
763                         "%s: SCIC IO Request requested to start while in wrong "
764                          "state %d\n", __func__, state);
765                 return SCI_FAILURE_INVALID_STATE;
766         }
767
768         /* if necessary, allocate a TCi for the io request object and then will,
769          * if necessary, copy the constructed TC data into the actual TC buffer.
770          * If everything is successful the post context field is updated with
771          * the TCi so the controller can post the request to the hardware.
772          */
773         if (sci_req->io_tag == SCI_CONTROLLER_INVALID_IO_TAG)
774                 sci_req->io_tag = scic_controller_allocate_io_tag(scic);
775
776         /* Record the IO Tag in the request */
777         if (sci_req->io_tag != SCI_CONTROLLER_INVALID_IO_TAG) {
778                 task_context = sci_req->task_context_buffer;
779
780                 task_context->task_index = scic_sds_io_tag_get_index(sci_req->io_tag);
781
782                 switch (task_context->protocol_type) {
783                 case SCU_TASK_CONTEXT_PROTOCOL_SMP:
784                 case SCU_TASK_CONTEXT_PROTOCOL_SSP:
785                         /* SSP/SMP Frame */
786                         task_context->type.ssp.tag = sci_req->io_tag;
787                         task_context->type.ssp.target_port_transfer_tag =
788                                 0xFFFF;
789                         break;
790
791                 case SCU_TASK_CONTEXT_PROTOCOL_STP:
792                         /* STP/SATA Frame
793                          * task_context->type.stp.ncq_tag = sci_req->ncq_tag;
794                          */
795                         break;
796
797                 case SCU_TASK_CONTEXT_PROTOCOL_NONE:
798                         /* / @todo When do we set no protocol type? */
799                         break;
800
801                 default:
802                         /* This should never happen since we build the IO
803                          * requests */
804                         break;
805                 }
806
807                 /*
808                  * Check to see if we need to copy the task context buffer
809                  * or have been building into the task context buffer */
810                 if (sci_req->was_tag_assigned_by_user == false)
811                         scic_sds_controller_copy_task_context(scic, sci_req);
812
813                 /* Add to the post_context the io tag value */
814                 sci_req->post_context |= scic_sds_io_tag_get_index(sci_req->io_tag);
815
816                 /* Everything is good go ahead and change state */
817                 sci_change_state(&sci_req->sm, SCI_REQ_STARTED);
818
819                 return SCI_SUCCESS;
820         }
821
822         return SCI_FAILURE_INSUFFICIENT_RESOURCES;
823 }
824
825 enum sci_status
826 scic_sds_io_request_terminate(struct scic_sds_request *sci_req)
827 {
828         enum sci_base_request_states state;
829
830         state = sci_req->sm.current_state_id;
831
832         switch (state) {
833         case SCI_REQ_CONSTRUCTED:
834                 scic_sds_request_set_status(sci_req,
835                         SCU_TASK_DONE_TASK_ABORT,
836                         SCI_FAILURE_IO_TERMINATED);
837
838                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
839                 return SCI_SUCCESS;
840         case SCI_REQ_STARTED:
841         case SCI_REQ_TASK_WAIT_TC_COMP:
842         case SCI_REQ_SMP_WAIT_RESP:
843         case SCI_REQ_SMP_WAIT_TC_COMP:
844         case SCI_REQ_STP_UDMA_WAIT_TC_COMP:
845         case SCI_REQ_STP_UDMA_WAIT_D2H:
846         case SCI_REQ_STP_NON_DATA_WAIT_H2D:
847         case SCI_REQ_STP_NON_DATA_WAIT_D2H:
848         case SCI_REQ_STP_PIO_WAIT_H2D:
849         case SCI_REQ_STP_PIO_WAIT_FRAME:
850         case SCI_REQ_STP_PIO_DATA_IN:
851         case SCI_REQ_STP_PIO_DATA_OUT:
852         case SCI_REQ_STP_SOFT_RESET_WAIT_H2D_ASSERTED:
853         case SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG:
854         case SCI_REQ_STP_SOFT_RESET_WAIT_D2H:
855                 sci_change_state(&sci_req->sm, SCI_REQ_ABORTING);
856                 return SCI_SUCCESS;
857         case SCI_REQ_TASK_WAIT_TC_RESP:
858                 sci_change_state(&sci_req->sm, SCI_REQ_ABORTING);
859                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
860                 return SCI_SUCCESS;
861         case SCI_REQ_ABORTING:
862                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
863                 return SCI_SUCCESS;
864         case SCI_REQ_COMPLETED:
865         default:
866                 dev_warn(scic_to_dev(sci_req->owning_controller),
867                          "%s: SCIC IO Request requested to abort while in wrong "
868                          "state %d\n",
869                          __func__,
870                          sci_req->sm.current_state_id);
871                 break;
872         }
873
874         return SCI_FAILURE_INVALID_STATE;
875 }
876
877 enum sci_status scic_sds_request_complete(struct scic_sds_request *sci_req)
878 {
879         enum sci_base_request_states state;
880         struct scic_sds_controller *scic = sci_req->owning_controller;
881
882         state = sci_req->sm.current_state_id;
883         if (WARN_ONCE(state != SCI_REQ_COMPLETED,
884                       "isci: request completion from wrong state (%d)\n", state))
885                 return SCI_FAILURE_INVALID_STATE;
886
887         if (!sci_req->was_tag_assigned_by_user)
888                 scic_controller_free_io_tag(scic, sci_req->io_tag);
889
890         if (sci_req->saved_rx_frame_index != SCU_INVALID_FRAME_INDEX)
891                 scic_sds_controller_release_frame(scic,
892                                                   sci_req->saved_rx_frame_index);
893
894         /* XXX can we just stop the machine and remove the 'final' state? */
895         sci_change_state(&sci_req->sm, SCI_REQ_FINAL);
896         return SCI_SUCCESS;
897 }
898
899 enum sci_status scic_sds_io_request_event_handler(struct scic_sds_request *sci_req,
900                                                   u32 event_code)
901 {
902         enum sci_base_request_states state;
903         struct scic_sds_controller *scic = sci_req->owning_controller;
904
905         state = sci_req->sm.current_state_id;
906
907         if (state != SCI_REQ_STP_PIO_DATA_IN) {
908                 dev_warn(scic_to_dev(scic), "%s: (%x) in wrong state %d\n",
909                          __func__, event_code, state);
910
911                 return SCI_FAILURE_INVALID_STATE;
912         }
913
914         switch (scu_get_event_specifier(event_code)) {
915         case SCU_TASK_DONE_CRC_ERR << SCU_EVENT_SPECIFIC_CODE_SHIFT:
916                 /* We are waiting for data and the SCU has R_ERR the data frame.
917                  * Go back to waiting for the D2H Register FIS
918                  */
919                 sci_change_state(&sci_req->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
920                 return SCI_SUCCESS;
921         default:
922                 dev_err(scic_to_dev(scic),
923                         "%s: pio request unexpected event %#x\n",
924                         __func__, event_code);
925
926                 /* TODO Should we fail the PIO request when we get an
927                  * unexpected event?
928                  */
929                 return SCI_FAILURE;
930         }
931 }
932
933 /*
934  * This function copies response data for requests returning response data
935  *    instead of sense data.
936  * @sci_req: This parameter specifies the request object for which to copy
937  *    the response data.
938  */
939 static void scic_sds_io_request_copy_response(struct scic_sds_request *sci_req)
940 {
941         void *resp_buf;
942         u32 len;
943         struct ssp_response_iu *ssp_response;
944         struct isci_request *ireq = sci_req_to_ireq(sci_req);
945         struct isci_tmf *isci_tmf = isci_request_access_tmf(ireq);
946
947         ssp_response = &sci_req->ssp.rsp;
948
949         resp_buf = &isci_tmf->resp.resp_iu;
950
951         len = min_t(u32,
952                     SSP_RESP_IU_MAX_SIZE,
953                     be32_to_cpu(ssp_response->response_data_len));
954
955         memcpy(resp_buf, ssp_response->resp_data, len);
956 }
957
958 static enum sci_status
959 request_started_state_tc_event(struct scic_sds_request *sci_req,
960                                u32 completion_code)
961 {
962         struct ssp_response_iu *resp_iu;
963         u8 datapres;
964
965         /* TODO: Any SDMA return code of other than 0 is bad decode 0x003C0000
966          * to determine SDMA status
967          */
968         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
969         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
970                 scic_sds_request_set_status(sci_req,
971                                             SCU_TASK_DONE_GOOD,
972                                             SCI_SUCCESS);
973                 break;
974         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_EARLY_RESP): {
975                 /* There are times when the SCU hardware will return an early
976                  * response because the io request specified more data than is
977                  * returned by the target device (mode pages, inquiry data,
978                  * etc.).  We must check the response stats to see if this is
979                  * truly a failed request or a good request that just got
980                  * completed early.
981                  */
982                 struct ssp_response_iu *resp = &sci_req->ssp.rsp;
983                 ssize_t word_cnt = SSP_RESP_IU_MAX_SIZE / sizeof(u32);
984
985                 sci_swab32_cpy(&sci_req->ssp.rsp,
986                                &sci_req->ssp.rsp,
987                                word_cnt);
988
989                 if (resp->status == 0) {
990                         scic_sds_request_set_status(sci_req,
991                                                     SCU_TASK_DONE_GOOD,
992                                                     SCI_SUCCESS_IO_DONE_EARLY);
993                 } else {
994                         scic_sds_request_set_status(sci_req,
995                                                     SCU_TASK_DONE_CHECK_RESPONSE,
996                                                     SCI_FAILURE_IO_RESPONSE_VALID);
997                 }
998                 break;
999         }
1000         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_CHECK_RESPONSE): {
1001                 ssize_t word_cnt = SSP_RESP_IU_MAX_SIZE / sizeof(u32);
1002
1003                 sci_swab32_cpy(&sci_req->ssp.rsp,
1004                                &sci_req->ssp.rsp,
1005                                word_cnt);
1006
1007                 scic_sds_request_set_status(sci_req,
1008                                             SCU_TASK_DONE_CHECK_RESPONSE,
1009                                             SCI_FAILURE_IO_RESPONSE_VALID);
1010                 break;
1011         }
1012
1013         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_RESP_LEN_ERR):
1014                 /* TODO With TASK_DONE_RESP_LEN_ERR is the response frame
1015                  * guaranteed to be received before this completion status is
1016                  * posted?
1017                  */
1018                 resp_iu = &sci_req->ssp.rsp;
1019                 datapres = resp_iu->datapres;
1020
1021                 if (datapres == 1 || datapres == 2) {
1022                         scic_sds_request_set_status(sci_req,
1023                                                     SCU_TASK_DONE_CHECK_RESPONSE,
1024                                                     SCI_FAILURE_IO_RESPONSE_VALID);
1025                 } else
1026                         scic_sds_request_set_status(sci_req,
1027                                                     SCU_TASK_DONE_GOOD,
1028                                                     SCI_SUCCESS);
1029                 break;
1030         /* only stp device gets suspended. */
1031         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_ACK_NAK_TO):
1032         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LL_PERR):
1033         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_NAK_ERR):
1034         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_DATA_LEN_ERR):
1035         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LL_ABORT_ERR):
1036         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_XR_WD_LEN):
1037         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_MAX_PLD_ERR):
1038         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_RESP):
1039         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_SDBFIS):
1040         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_REG_ERR):
1041         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SDB_ERR):
1042                 if (sci_req->protocol == SCIC_STP_PROTOCOL) {
1043                         scic_sds_request_set_status(sci_req,
1044                                 SCU_GET_COMPLETION_TL_STATUS(completion_code) >>
1045                                 SCU_COMPLETION_TL_STATUS_SHIFT,
1046                                 SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED);
1047                 } else {
1048                         scic_sds_request_set_status(sci_req,
1049                                 SCU_GET_COMPLETION_TL_STATUS(completion_code) >>
1050                                 SCU_COMPLETION_TL_STATUS_SHIFT,
1051                                 SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR);
1052                 }
1053                 break;
1054
1055         /* both stp/ssp device gets suspended */
1056         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LF_ERR):
1057         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_WRONG_DESTINATION):
1058         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1):
1059         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2):
1060         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_3):
1061         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_BAD_DESTINATION):
1062         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_ZONE_VIOLATION):
1063         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_STP_RESOURCES_BUSY):
1064         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_PROTOCOL_NOT_SUPPORTED):
1065         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_CONNECTION_RATE_NOT_SUPPORTED):
1066                 scic_sds_request_set_status(sci_req,
1067                                             SCU_GET_COMPLETION_TL_STATUS(completion_code) >>
1068                                             SCU_COMPLETION_TL_STATUS_SHIFT,
1069                                             SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED);
1070                 break;
1071
1072         /* neither ssp nor stp gets suspended. */
1073         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_NAK_CMD_ERR):
1074         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_XR):
1075         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_XR_IU_LEN_ERR):
1076         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SDMA_ERR):
1077         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_OFFSET_ERR):
1078         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_EXCESS_DATA):
1079         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_RESP_TO_ERR):
1080         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_UFI_ERR):
1081         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_FRM_TYPE_ERR):
1082         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_LL_RX_ERR):
1083         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_DATA):
1084         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_OPEN_FAIL):
1085         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_VIIT_ENTRY_NV):
1086         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_IIT_ENTRY_NV):
1087         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_RNCNV_OUTBOUND):
1088         default:
1089                 scic_sds_request_set_status(
1090                         sci_req,
1091                         SCU_GET_COMPLETION_TL_STATUS(completion_code) >>
1092                         SCU_COMPLETION_TL_STATUS_SHIFT,
1093                         SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR);
1094                 break;
1095         }
1096
1097         /*
1098          * TODO: This is probably wrong for ACK/NAK timeout conditions
1099          */
1100
1101         /* In all cases we will treat this as the completion of the IO req. */
1102         sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1103         return SCI_SUCCESS;
1104 }
1105
1106 static enum sci_status
1107 request_aborting_state_tc_event(struct scic_sds_request *sci_req,
1108                                 u32 completion_code)
1109 {
1110         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1111         case (SCU_TASK_DONE_GOOD << SCU_COMPLETION_TL_STATUS_SHIFT):
1112         case (SCU_TASK_DONE_TASK_ABORT << SCU_COMPLETION_TL_STATUS_SHIFT):
1113                 scic_sds_request_set_status(sci_req, SCU_TASK_DONE_TASK_ABORT,
1114                                             SCI_FAILURE_IO_TERMINATED);
1115
1116                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1117                 break;
1118
1119         default:
1120                 /* Unless we get some strange error wait for the task abort to complete
1121                  * TODO: Should there be a state change for this completion?
1122                  */
1123                 break;
1124         }
1125
1126         return SCI_SUCCESS;
1127 }
1128
1129 static enum sci_status ssp_task_request_await_tc_event(struct scic_sds_request *sci_req,
1130                                                        u32 completion_code)
1131 {
1132         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1133         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1134                 scic_sds_request_set_status(sci_req, SCU_TASK_DONE_GOOD,
1135                                             SCI_SUCCESS);
1136
1137                 sci_change_state(&sci_req->sm, SCI_REQ_TASK_WAIT_TC_RESP);
1138                 break;
1139         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_ACK_NAK_TO):
1140                 /* Currently, the decision is to simply allow the task request
1141                  * to timeout if the task IU wasn't received successfully.
1142                  * There is a potential for receiving multiple task responses if
1143                  * we decide to send the task IU again.
1144                  */
1145                 dev_warn(scic_to_dev(sci_req->owning_controller),
1146                          "%s: TaskRequest:0x%p CompletionCode:%x - "
1147                          "ACK/NAK timeout\n", __func__, sci_req,
1148                          completion_code);
1149
1150                 sci_change_state(&sci_req->sm, SCI_REQ_TASK_WAIT_TC_RESP);
1151                 break;
1152         default:
1153                 /*
1154                  * All other completion status cause the IO to be complete.
1155                  * If a NAK was received, then it is up to the user to retry
1156                  * the request.
1157                  */
1158                 scic_sds_request_set_status(sci_req,
1159                         SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
1160                         SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR);
1161
1162                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1163                 break;
1164         }
1165
1166         return SCI_SUCCESS;
1167 }
1168
1169 static enum sci_status
1170 smp_request_await_response_tc_event(struct scic_sds_request *sci_req,
1171                                     u32 completion_code)
1172 {
1173         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1174         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1175                 /* In the AWAIT RESPONSE state, any TC completion is
1176                  * unexpected.  but if the TC has success status, we
1177                  * complete the IO anyway.
1178                  */
1179                 scic_sds_request_set_status(sci_req, SCU_TASK_DONE_GOOD,
1180                                             SCI_SUCCESS);
1181
1182                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1183                 break;
1184
1185         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_RESP_TO_ERR):
1186         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_UFI_ERR):
1187         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_FRM_TYPE_ERR):
1188         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_LL_RX_ERR):
1189                 /* These status has been seen in a specific LSI
1190                  * expander, which sometimes is not able to send smp
1191                  * response within 2 ms. This causes our hardware break
1192                  * the connection and set TC completion with one of
1193                  * these SMP_XXX_XX_ERR status. For these type of error,
1194                  * we ask scic user to retry the request.
1195                  */
1196                 scic_sds_request_set_status(sci_req, SCU_TASK_DONE_SMP_RESP_TO_ERR,
1197                                             SCI_FAILURE_RETRY_REQUIRED);
1198
1199                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1200                 break;
1201
1202         default:
1203                 /* All other completion status cause the IO to be complete.  If a NAK
1204                  * was received, then it is up to the user to retry the request
1205                  */
1206                 scic_sds_request_set_status(sci_req,
1207                                             SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
1208                                             SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR);
1209
1210                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1211                 break;
1212         }
1213
1214         return SCI_SUCCESS;
1215 }
1216
1217 static enum sci_status
1218 smp_request_await_tc_event(struct scic_sds_request *sci_req,
1219                            u32 completion_code)
1220 {
1221         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1222         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1223                 scic_sds_request_set_status(sci_req, SCU_TASK_DONE_GOOD,
1224                                             SCI_SUCCESS);
1225
1226                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1227                 break;
1228         default:
1229                 /* All other completion status cause the IO to be
1230                  * complete.  If a NAK was received, then it is up to
1231                  * the user to retry the request.
1232                  */
1233                 scic_sds_request_set_status(sci_req,
1234                                             SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
1235                                             SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR);
1236
1237                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1238                 break;
1239         }
1240
1241         return SCI_SUCCESS;
1242 }
1243
1244 void scic_stp_io_request_set_ncq_tag(struct scic_sds_request *req,
1245                                      u16 ncq_tag)
1246 {
1247         /**
1248          * @note This could be made to return an error to the user if the user
1249          *       attempts to set the NCQ tag in the wrong state.
1250          */
1251         req->task_context_buffer->type.stp.ncq_tag = ncq_tag;
1252 }
1253
1254 /**
1255  *
1256  * @sci_req:
1257  *
1258  * Get the next SGL element from the request. - Check on which SGL element pair
1259  * we are working - if working on SLG pair element A - advance to element B -
1260  * else - check to see if there are more SGL element pairs for this IO request
1261  * - if there are more SGL element pairs - advance to the next pair and return
1262  * element A struct scu_sgl_element*
1263  */
1264 static struct scu_sgl_element *scic_sds_stp_request_pio_get_next_sgl(struct scic_sds_stp_request *stp_req)
1265 {
1266         struct scu_sgl_element *current_sgl;
1267         struct scic_sds_request *sci_req = to_sci_req(stp_req);
1268         struct scic_sds_request_pio_sgl *pio_sgl = &stp_req->type.pio.request_current;
1269
1270         if (pio_sgl->sgl_set == SCU_SGL_ELEMENT_PAIR_A) {
1271                 if (pio_sgl->sgl_pair->B.address_lower == 0 &&
1272                     pio_sgl->sgl_pair->B.address_upper == 0) {
1273                         current_sgl = NULL;
1274                 } else {
1275                         pio_sgl->sgl_set = SCU_SGL_ELEMENT_PAIR_B;
1276                         current_sgl = &pio_sgl->sgl_pair->B;
1277                 }
1278         } else {
1279                 if (pio_sgl->sgl_pair->next_pair_lower == 0 &&
1280                     pio_sgl->sgl_pair->next_pair_upper == 0) {
1281                         current_sgl = NULL;
1282                 } else {
1283                         u64 phys_addr;
1284
1285                         phys_addr = pio_sgl->sgl_pair->next_pair_upper;
1286                         phys_addr <<= 32;
1287                         phys_addr |= pio_sgl->sgl_pair->next_pair_lower;
1288
1289                         pio_sgl->sgl_pair = scic_request_get_virt_addr(sci_req, phys_addr);
1290                         pio_sgl->sgl_set = SCU_SGL_ELEMENT_PAIR_A;
1291                         current_sgl = &pio_sgl->sgl_pair->A;
1292                 }
1293         }
1294
1295         return current_sgl;
1296 }
1297
1298 static enum sci_status
1299 stp_request_non_data_await_h2d_tc_event(struct scic_sds_request *sci_req,
1300                                         u32 completion_code)
1301 {
1302         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1303         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1304                 scic_sds_request_set_status(sci_req, SCU_TASK_DONE_GOOD,
1305                                             SCI_SUCCESS);
1306
1307                 sci_change_state(&sci_req->sm, SCI_REQ_STP_NON_DATA_WAIT_D2H);
1308                 break;
1309
1310         default:
1311                 /* All other completion status cause the IO to be
1312                  * complete.  If a NAK was received, then it is up to
1313                  * the user to retry the request.
1314                  */
1315                 scic_sds_request_set_status(sci_req,
1316                                             SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
1317                                             SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR);
1318
1319                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1320                 break;
1321         }
1322
1323         return SCI_SUCCESS;
1324 }
1325
1326 #define SCU_MAX_FRAME_BUFFER_SIZE  0x400  /* 1K is the maximum SCU frame data payload */
1327
1328 /* transmit DATA_FIS from (current sgl + offset) for input
1329  * parameter length. current sgl and offset is alreay stored in the IO request
1330  */
1331 static enum sci_status scic_sds_stp_request_pio_data_out_trasmit_data_frame(
1332         struct scic_sds_request *sci_req,
1333         u32 length)
1334 {
1335         struct scic_sds_controller *scic = sci_req->owning_controller;
1336         struct scic_sds_stp_request *stp_req = &sci_req->stp.req;
1337         struct scu_task_context *task_context;
1338         struct scu_sgl_element *current_sgl;
1339
1340         /* Recycle the TC and reconstruct it for sending out DATA FIS containing
1341          * for the data from current_sgl+offset for the input length
1342          */
1343         task_context = scic_sds_controller_get_task_context_buffer(scic,
1344                                                                    sci_req->io_tag);
1345
1346         if (stp_req->type.pio.request_current.sgl_set == SCU_SGL_ELEMENT_PAIR_A)
1347                 current_sgl = &stp_req->type.pio.request_current.sgl_pair->A;
1348         else
1349                 current_sgl = &stp_req->type.pio.request_current.sgl_pair->B;
1350
1351         /* update the TC */
1352         task_context->command_iu_upper = current_sgl->address_upper;
1353         task_context->command_iu_lower = current_sgl->address_lower;
1354         task_context->transfer_length_bytes = length;
1355         task_context->type.stp.fis_type = FIS_DATA;
1356
1357         /* send the new TC out. */
1358         return scic_controller_continue_io(sci_req);
1359 }
1360
1361 static enum sci_status scic_sds_stp_request_pio_data_out_transmit_data(struct scic_sds_request *sci_req)
1362 {
1363
1364         struct scu_sgl_element *current_sgl;
1365         u32 sgl_offset;
1366         u32 remaining_bytes_in_current_sgl = 0;
1367         enum sci_status status = SCI_SUCCESS;
1368         struct scic_sds_stp_request *stp_req = &sci_req->stp.req;
1369
1370         sgl_offset = stp_req->type.pio.request_current.sgl_offset;
1371
1372         if (stp_req->type.pio.request_current.sgl_set == SCU_SGL_ELEMENT_PAIR_A) {
1373                 current_sgl = &(stp_req->type.pio.request_current.sgl_pair->A);
1374                 remaining_bytes_in_current_sgl = stp_req->type.pio.request_current.sgl_pair->A.length - sgl_offset;
1375         } else {
1376                 current_sgl = &(stp_req->type.pio.request_current.sgl_pair->B);
1377                 remaining_bytes_in_current_sgl = stp_req->type.pio.request_current.sgl_pair->B.length - sgl_offset;
1378         }
1379
1380
1381         if (stp_req->type.pio.pio_transfer_bytes > 0) {
1382                 if (stp_req->type.pio.pio_transfer_bytes >= remaining_bytes_in_current_sgl) {
1383                         /* recycle the TC and send the H2D Data FIS from (current sgl + sgl_offset) and length = remaining_bytes_in_current_sgl */
1384                         status = scic_sds_stp_request_pio_data_out_trasmit_data_frame(sci_req, remaining_bytes_in_current_sgl);
1385                         if (status == SCI_SUCCESS) {
1386                                 stp_req->type.pio.pio_transfer_bytes -= remaining_bytes_in_current_sgl;
1387
1388                                 /* update the current sgl, sgl_offset and save for future */
1389                                 current_sgl = scic_sds_stp_request_pio_get_next_sgl(stp_req);
1390                                 sgl_offset = 0;
1391                         }
1392                 } else if (stp_req->type.pio.pio_transfer_bytes < remaining_bytes_in_current_sgl) {
1393                         /* recycle the TC and send the H2D Data FIS from (current sgl + sgl_offset) and length = type.pio.pio_transfer_bytes */
1394                         scic_sds_stp_request_pio_data_out_trasmit_data_frame(sci_req, stp_req->type.pio.pio_transfer_bytes);
1395
1396                         if (status == SCI_SUCCESS) {
1397                                 /* Sgl offset will be adjusted and saved for future */
1398                                 sgl_offset += stp_req->type.pio.pio_transfer_bytes;
1399                                 current_sgl->address_lower += stp_req->type.pio.pio_transfer_bytes;
1400                                 stp_req->type.pio.pio_transfer_bytes = 0;
1401                         }
1402                 }
1403         }
1404
1405         if (status == SCI_SUCCESS) {
1406                 stp_req->type.pio.request_current.sgl_offset = sgl_offset;
1407         }
1408
1409         return status;
1410 }
1411
1412 /**
1413  *
1414  * @stp_request: The request that is used for the SGL processing.
1415  * @data_buffer: The buffer of data to be copied.
1416  * @length: The length of the data transfer.
1417  *
1418  * Copy the data from the buffer for the length specified to the IO reqeust SGL
1419  * specified data region. enum sci_status
1420  */
1421 static enum sci_status
1422 scic_sds_stp_request_pio_data_in_copy_data_buffer(struct scic_sds_stp_request *stp_req,
1423                                                   u8 *data_buf, u32 len)
1424 {
1425         struct scic_sds_request *sci_req;
1426         struct isci_request *ireq;
1427         u8 *src_addr;
1428         int copy_len;
1429         struct sas_task *task;
1430         struct scatterlist *sg;
1431         void *kaddr;
1432         int total_len = len;
1433
1434         sci_req = to_sci_req(stp_req);
1435         ireq = sci_req_to_ireq(sci_req);
1436         task = isci_request_access_task(ireq);
1437         src_addr = data_buf;
1438
1439         if (task->num_scatter > 0) {
1440                 sg = task->scatter;
1441
1442                 while (total_len > 0) {
1443                         struct page *page = sg_page(sg);
1444
1445                         copy_len = min_t(int, total_len, sg_dma_len(sg));
1446                         kaddr = kmap_atomic(page, KM_IRQ0);
1447                         memcpy(kaddr + sg->offset, src_addr, copy_len);
1448                         kunmap_atomic(kaddr, KM_IRQ0);
1449                         total_len -= copy_len;
1450                         src_addr += copy_len;
1451                         sg = sg_next(sg);
1452                 }
1453         } else {
1454                 BUG_ON(task->total_xfer_len < total_len);
1455                 memcpy(task->scatter, src_addr, total_len);
1456         }
1457
1458         return SCI_SUCCESS;
1459 }
1460
1461 /**
1462  *
1463  * @sci_req: The PIO DATA IN request that is to receive the data.
1464  * @data_buffer: The buffer to copy from.
1465  *
1466  * Copy the data buffer to the io request data region. enum sci_status
1467  */
1468 static enum sci_status scic_sds_stp_request_pio_data_in_copy_data(
1469         struct scic_sds_stp_request *sci_req,
1470         u8 *data_buffer)
1471 {
1472         enum sci_status status;
1473
1474         /*
1475          * If there is less than 1K remaining in the transfer request
1476          * copy just the data for the transfer */
1477         if (sci_req->type.pio.pio_transfer_bytes < SCU_MAX_FRAME_BUFFER_SIZE) {
1478                 status = scic_sds_stp_request_pio_data_in_copy_data_buffer(
1479                         sci_req, data_buffer, sci_req->type.pio.pio_transfer_bytes);
1480
1481                 if (status == SCI_SUCCESS)
1482                         sci_req->type.pio.pio_transfer_bytes = 0;
1483         } else {
1484                 /* We are transfering the whole frame so copy */
1485                 status = scic_sds_stp_request_pio_data_in_copy_data_buffer(
1486                         sci_req, data_buffer, SCU_MAX_FRAME_BUFFER_SIZE);
1487
1488                 if (status == SCI_SUCCESS)
1489                         sci_req->type.pio.pio_transfer_bytes -= SCU_MAX_FRAME_BUFFER_SIZE;
1490         }
1491
1492         return status;
1493 }
1494
1495 static enum sci_status
1496 stp_request_pio_await_h2d_completion_tc_event(struct scic_sds_request *sci_req,
1497                                               u32 completion_code)
1498 {
1499         enum sci_status status = SCI_SUCCESS;
1500
1501         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1502         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1503                 scic_sds_request_set_status(sci_req,
1504                                             SCU_TASK_DONE_GOOD,
1505                                             SCI_SUCCESS);
1506
1507                 sci_change_state(&sci_req->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
1508                 break;
1509
1510         default:
1511                 /* All other completion status cause the IO to be
1512                  * complete.  If a NAK was received, then it is up to
1513                  * the user to retry the request.
1514                  */
1515                 scic_sds_request_set_status(sci_req,
1516                                             SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
1517                                             SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR);
1518
1519                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1520                 break;
1521         }
1522
1523         return status;
1524 }
1525
1526 static enum sci_status
1527 pio_data_out_tx_done_tc_event(struct scic_sds_request *sci_req,
1528                               u32 completion_code)
1529 {
1530         enum sci_status status = SCI_SUCCESS;
1531         bool all_frames_transferred = false;
1532         struct scic_sds_stp_request *stp_req = &sci_req->stp.req;
1533
1534         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1535         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1536                 /* Transmit data */
1537                 if (stp_req->type.pio.pio_transfer_bytes != 0) {
1538                         status = scic_sds_stp_request_pio_data_out_transmit_data(sci_req);
1539                         if (status == SCI_SUCCESS) {
1540                                 if (stp_req->type.pio.pio_transfer_bytes == 0)
1541                                         all_frames_transferred = true;
1542                         }
1543                 } else if (stp_req->type.pio.pio_transfer_bytes == 0) {
1544                         /*
1545                          * this will happen if the all data is written at the
1546                          * first time after the pio setup fis is received
1547                          */
1548                         all_frames_transferred  = true;
1549                 }
1550
1551                 /* all data transferred. */
1552                 if (all_frames_transferred) {
1553                         /*
1554                          * Change the state to SCI_REQ_STP_PIO_DATA_IN
1555                          * and wait for PIO_SETUP fis / or D2H REg fis. */
1556                         sci_change_state(&sci_req->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
1557                 }
1558                 break;
1559
1560         default:
1561                 /*
1562                  * All other completion status cause the IO to be complete.
1563                  * If a NAK was received, then it is up to the user to retry
1564                  * the request.
1565                  */
1566                 scic_sds_request_set_status(
1567                         sci_req,
1568                         SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
1569                         SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR);
1570
1571                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1572                 break;
1573         }
1574
1575         return status;
1576 }
1577
1578 static void scic_sds_stp_request_udma_complete_request(
1579         struct scic_sds_request *request,
1580         u32 scu_status,
1581         enum sci_status sci_status)
1582 {
1583         scic_sds_request_set_status(request, scu_status, sci_status);
1584         sci_change_state(&request->sm, SCI_REQ_COMPLETED);
1585 }
1586
1587 static enum sci_status scic_sds_stp_request_udma_general_frame_handler(struct scic_sds_request *sci_req,
1588                                                                        u32 frame_index)
1589 {
1590         struct scic_sds_controller *scic = sci_req->owning_controller;
1591         struct dev_to_host_fis *frame_header;
1592         enum sci_status status;
1593         u32 *frame_buffer;
1594
1595         status = scic_sds_unsolicited_frame_control_get_header(&scic->uf_control,
1596                                                                frame_index,
1597                                                                (void **)&frame_header);
1598
1599         if ((status == SCI_SUCCESS) &&
1600             (frame_header->fis_type == FIS_REGD2H)) {
1601                 scic_sds_unsolicited_frame_control_get_buffer(&scic->uf_control,
1602                                                               frame_index,
1603                                                               (void **)&frame_buffer);
1604
1605                 scic_sds_controller_copy_sata_response(&sci_req->stp.rsp,
1606                                                        frame_header,
1607                                                        frame_buffer);
1608         }
1609
1610         scic_sds_controller_release_frame(scic, frame_index);
1611
1612         return status;
1613 }
1614
1615 enum sci_status
1616 scic_sds_io_request_frame_handler(struct scic_sds_request *sci_req,
1617                                   u32 frame_index)
1618 {
1619         struct scic_sds_controller *scic = sci_req->owning_controller;
1620         struct scic_sds_stp_request *stp_req = &sci_req->stp.req;
1621         enum sci_base_request_states state;
1622         enum sci_status status;
1623         ssize_t word_cnt;
1624
1625         state = sci_req->sm.current_state_id;
1626         switch (state)  {
1627         case SCI_REQ_STARTED: {
1628                 struct ssp_frame_hdr ssp_hdr;
1629                 void *frame_header;
1630
1631                 scic_sds_unsolicited_frame_control_get_header(&scic->uf_control,
1632                                                               frame_index,
1633                                                               &frame_header);
1634
1635                 word_cnt = sizeof(struct ssp_frame_hdr) / sizeof(u32);
1636                 sci_swab32_cpy(&ssp_hdr, frame_header, word_cnt);
1637
1638                 if (ssp_hdr.frame_type == SSP_RESPONSE) {
1639                         struct ssp_response_iu *resp_iu;
1640                         ssize_t word_cnt = SSP_RESP_IU_MAX_SIZE / sizeof(u32);
1641
1642                         scic_sds_unsolicited_frame_control_get_buffer(&scic->uf_control,
1643                                                                       frame_index,
1644                                                                       (void **)&resp_iu);
1645
1646                         sci_swab32_cpy(&sci_req->ssp.rsp, resp_iu, word_cnt);
1647
1648                         resp_iu = &sci_req->ssp.rsp;
1649
1650                         if (resp_iu->datapres == 0x01 ||
1651                             resp_iu->datapres == 0x02) {
1652                                 scic_sds_request_set_status(sci_req,
1653                                                             SCU_TASK_DONE_CHECK_RESPONSE,
1654                                                             SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR);
1655                         } else
1656                                 scic_sds_request_set_status(sci_req,
1657                                                             SCU_TASK_DONE_GOOD,
1658                                                             SCI_SUCCESS);
1659                 } else {
1660                         /* not a response frame, why did it get forwarded? */
1661                         dev_err(scic_to_dev(scic),
1662                                 "%s: SCIC IO Request 0x%p received unexpected "
1663                                 "frame %d type 0x%02x\n", __func__, sci_req,
1664                                 frame_index, ssp_hdr.frame_type);
1665                 }
1666
1667                 /*
1668                  * In any case we are done with this frame buffer return it to
1669                  * the controller
1670                  */
1671                 scic_sds_controller_release_frame(scic, frame_index);
1672
1673                 return SCI_SUCCESS;
1674         }
1675
1676         case SCI_REQ_TASK_WAIT_TC_RESP:
1677                 scic_sds_io_request_copy_response(sci_req);
1678                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1679                 scic_sds_controller_release_frame(scic,frame_index);
1680                 return SCI_SUCCESS;
1681
1682         case SCI_REQ_SMP_WAIT_RESP: {
1683                 struct smp_resp *rsp_hdr = &sci_req->smp.rsp;
1684                 void *frame_header;
1685
1686                 scic_sds_unsolicited_frame_control_get_header(&scic->uf_control,
1687                                                               frame_index,
1688                                                               &frame_header);
1689
1690                 /* byte swap the header. */
1691                 word_cnt = SMP_RESP_HDR_SZ / sizeof(u32);
1692                 sci_swab32_cpy(rsp_hdr, frame_header, word_cnt);
1693
1694                 if (rsp_hdr->frame_type == SMP_RESPONSE) {
1695                         void *smp_resp;
1696
1697                         scic_sds_unsolicited_frame_control_get_buffer(&scic->uf_control,
1698                                                                       frame_index,
1699                                                                       &smp_resp);
1700
1701                         word_cnt = (sizeof(struct smp_req) - SMP_RESP_HDR_SZ) /
1702                                 sizeof(u32);
1703
1704                         sci_swab32_cpy(((u8 *) rsp_hdr) + SMP_RESP_HDR_SZ,
1705                                        smp_resp, word_cnt);
1706
1707                         scic_sds_request_set_status(sci_req, SCU_TASK_DONE_GOOD,
1708                                                     SCI_SUCCESS);
1709
1710                         sci_change_state(&sci_req->sm, SCI_REQ_SMP_WAIT_TC_COMP);
1711                 } else {
1712                         /*
1713                          * This was not a response frame why did it get
1714                          * forwarded?
1715                          */
1716                         dev_err(scic_to_dev(scic),
1717                                 "%s: SCIC SMP Request 0x%p received unexpected "
1718                                 "frame %d type 0x%02x\n",
1719                                 __func__,
1720                                 sci_req,
1721                                 frame_index,
1722                                 rsp_hdr->frame_type);
1723
1724                         scic_sds_request_set_status(sci_req,
1725                                                     SCU_TASK_DONE_SMP_FRM_TYPE_ERR,
1726                                                     SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR);
1727
1728                         sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1729                 }
1730
1731                 scic_sds_controller_release_frame(scic, frame_index);
1732
1733                 return SCI_SUCCESS;
1734         }
1735
1736         case SCI_REQ_STP_UDMA_WAIT_TC_COMP:
1737                 return scic_sds_stp_request_udma_general_frame_handler(sci_req,
1738                                                                        frame_index);
1739
1740         case SCI_REQ_STP_UDMA_WAIT_D2H:
1741                 /* Use the general frame handler to copy the resposne data */
1742                 status = scic_sds_stp_request_udma_general_frame_handler(sci_req,
1743                                                                          frame_index);
1744
1745                 if (status != SCI_SUCCESS)
1746                         return status;
1747
1748                 scic_sds_stp_request_udma_complete_request(sci_req,
1749                                                            SCU_TASK_DONE_CHECK_RESPONSE,
1750                                                            SCI_FAILURE_IO_RESPONSE_VALID);
1751
1752                 return SCI_SUCCESS;
1753
1754         case SCI_REQ_STP_NON_DATA_WAIT_D2H: {
1755                 struct dev_to_host_fis *frame_header;
1756                 u32 *frame_buffer;
1757
1758                 status = scic_sds_unsolicited_frame_control_get_header(&scic->uf_control,
1759                                                                        frame_index,
1760                                                                        (void **)&frame_header);
1761
1762                 if (status != SCI_SUCCESS) {
1763                         dev_err(scic_to_dev(scic),
1764                                 "%s: SCIC IO Request 0x%p could not get frame "
1765                                 "header for frame index %d, status %x\n",
1766                                 __func__,
1767                                 stp_req,
1768                                 frame_index,
1769                                 status);
1770
1771                         return status;
1772                 }
1773
1774                 switch (frame_header->fis_type) {
1775                 case FIS_REGD2H:
1776                         scic_sds_unsolicited_frame_control_get_buffer(&scic->uf_control,
1777                                                                       frame_index,
1778                                                                       (void **)&frame_buffer);
1779
1780                         scic_sds_controller_copy_sata_response(&sci_req->stp.rsp,
1781                                                                frame_header,
1782                                                                frame_buffer);
1783
1784                         /* The command has completed with error */
1785                         scic_sds_request_set_status(sci_req, SCU_TASK_DONE_CHECK_RESPONSE,
1786                                                     SCI_FAILURE_IO_RESPONSE_VALID);
1787                         break;
1788
1789                 default:
1790                         dev_warn(scic_to_dev(scic),
1791                                  "%s: IO Request:0x%p Frame Id:%d protocol "
1792                                   "violation occurred\n", __func__, stp_req,
1793                                   frame_index);
1794
1795                         scic_sds_request_set_status(sci_req, SCU_TASK_DONE_UNEXP_FIS,
1796                                                     SCI_FAILURE_PROTOCOL_VIOLATION);
1797                         break;
1798                 }
1799
1800                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1801
1802                 /* Frame has been decoded return it to the controller */
1803                 scic_sds_controller_release_frame(scic, frame_index);
1804
1805                 return status;
1806         }
1807
1808         case SCI_REQ_STP_PIO_WAIT_FRAME: {
1809                 struct isci_request *ireq = sci_req_to_ireq(sci_req);
1810                 struct sas_task *task = isci_request_access_task(ireq);
1811                 struct dev_to_host_fis *frame_header;
1812                 u32 *frame_buffer;
1813
1814                 status = scic_sds_unsolicited_frame_control_get_header(&scic->uf_control,
1815                                                                        frame_index,
1816                                                                        (void **)&frame_header);
1817
1818                 if (status != SCI_SUCCESS) {
1819                         dev_err(scic_to_dev(scic),
1820                                 "%s: SCIC IO Request 0x%p could not get frame "
1821                                 "header for frame index %d, status %x\n",
1822                                 __func__, stp_req, frame_index, status);
1823                         return status;
1824                 }
1825
1826                 switch (frame_header->fis_type) {
1827                 case FIS_PIO_SETUP:
1828                         /* Get from the frame buffer the PIO Setup Data */
1829                         scic_sds_unsolicited_frame_control_get_buffer(&scic->uf_control,
1830                                                                       frame_index,
1831                                                                       (void **)&frame_buffer);
1832
1833                         /* Get the data from the PIO Setup The SCU Hardware
1834                          * returns first word in the frame_header and the rest
1835                          * of the data is in the frame buffer so we need to
1836                          * back up one dword
1837                          */
1838
1839                         /* transfer_count: first 16bits in the 4th dword */
1840                         stp_req->type.pio.pio_transfer_bytes = frame_buffer[3] & 0xffff;
1841
1842                         /* ending_status: 4th byte in the 3rd dword */
1843                         stp_req->type.pio.ending_status = (frame_buffer[2] >> 24) & 0xff;
1844
1845                         scic_sds_controller_copy_sata_response(&sci_req->stp.rsp,
1846                                                                frame_header,
1847                                                                frame_buffer);
1848
1849                         sci_req->stp.rsp.status = stp_req->type.pio.ending_status;
1850
1851                         /* The next state is dependent on whether the
1852                          * request was PIO Data-in or Data out
1853                          */
1854                         if (task->data_dir == DMA_FROM_DEVICE) {
1855                                 sci_change_state(&sci_req->sm, SCI_REQ_STP_PIO_DATA_IN);
1856                         } else if (task->data_dir == DMA_TO_DEVICE) {
1857                                 /* Transmit data */
1858                                 status = scic_sds_stp_request_pio_data_out_transmit_data(sci_req);
1859                                 if (status != SCI_SUCCESS)
1860                                         break;
1861                                 sci_change_state(&sci_req->sm, SCI_REQ_STP_PIO_DATA_OUT);
1862                         }
1863                         break;
1864
1865                 case FIS_SETDEVBITS:
1866                         sci_change_state(&sci_req->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
1867                         break;
1868
1869                 case FIS_REGD2H:
1870                         if (frame_header->status & ATA_BUSY) {
1871                                 /*
1872                                  * Now why is the drive sending a D2H Register
1873                                  * FIS when it is still busy?  Do nothing since
1874                                  * we are still in the right state.
1875                                  */
1876                                 dev_dbg(scic_to_dev(scic),
1877                                         "%s: SCIC PIO Request 0x%p received "
1878                                         "D2H Register FIS with BSY status "
1879                                         "0x%x\n",
1880                                         __func__,
1881                                         stp_req,
1882                                         frame_header->status);
1883                                 break;
1884                         }
1885
1886                         scic_sds_unsolicited_frame_control_get_buffer(&scic->uf_control,
1887                                                                       frame_index,
1888                                                                       (void **)&frame_buffer);
1889
1890                         scic_sds_controller_copy_sata_response(&sci_req->stp.req,
1891                                                                frame_header,
1892                                                                frame_buffer);
1893
1894                         scic_sds_request_set_status(sci_req,
1895                                                     SCU_TASK_DONE_CHECK_RESPONSE,
1896                                                     SCI_FAILURE_IO_RESPONSE_VALID);
1897
1898                         sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1899                         break;
1900
1901                 default:
1902                         /* FIXME: what do we do here? */
1903                         break;
1904                 }
1905
1906                 /* Frame is decoded return it to the controller */
1907                 scic_sds_controller_release_frame(scic, frame_index);
1908
1909                 return status;
1910         }
1911
1912         case SCI_REQ_STP_PIO_DATA_IN: {
1913                 struct dev_to_host_fis *frame_header;
1914                 struct sata_fis_data *frame_buffer;
1915
1916                 status = scic_sds_unsolicited_frame_control_get_header(&scic->uf_control,
1917                                                                        frame_index,
1918                                                                        (void **)&frame_header);
1919
1920                 if (status != SCI_SUCCESS) {
1921                         dev_err(scic_to_dev(scic),
1922                                 "%s: SCIC IO Request 0x%p could not get frame "
1923                                 "header for frame index %d, status %x\n",
1924                                 __func__,
1925                                 stp_req,
1926                                 frame_index,
1927                                 status);
1928                         return status;
1929                 }
1930
1931                 if (frame_header->fis_type != FIS_DATA) {
1932                         dev_err(scic_to_dev(scic),
1933                                 "%s: SCIC PIO Request 0x%p received frame %d "
1934                                 "with fis type 0x%02x when expecting a data "
1935                                 "fis.\n",
1936                                 __func__,
1937                                 stp_req,
1938                                 frame_index,
1939                                 frame_header->fis_type);
1940
1941                         scic_sds_request_set_status(sci_req,
1942                                                     SCU_TASK_DONE_GOOD,
1943                                                     SCI_FAILURE_IO_REQUIRES_SCSI_ABORT);
1944
1945                         sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1946
1947                         /* Frame is decoded return it to the controller */
1948                         scic_sds_controller_release_frame(scic, frame_index);
1949                         return status;
1950                 }
1951
1952                 if (stp_req->type.pio.request_current.sgl_pair == NULL) {
1953                         sci_req->saved_rx_frame_index = frame_index;
1954                         stp_req->type.pio.pio_transfer_bytes = 0;
1955                 } else {
1956                         scic_sds_unsolicited_frame_control_get_buffer(&scic->uf_control,
1957                                                                       frame_index,
1958                                                                       (void **)&frame_buffer);
1959
1960                         status = scic_sds_stp_request_pio_data_in_copy_data(stp_req,
1961                                                                             (u8 *)frame_buffer);
1962
1963                         /* Frame is decoded return it to the controller */
1964                         scic_sds_controller_release_frame(scic, frame_index);
1965                 }
1966
1967                 /* Check for the end of the transfer, are there more
1968                  * bytes remaining for this data transfer
1969                  */
1970                 if (status != SCI_SUCCESS ||
1971                     stp_req->type.pio.pio_transfer_bytes != 0)
1972                         return status;
1973
1974                 if ((stp_req->type.pio.ending_status & ATA_BUSY) == 0) {
1975                         scic_sds_request_set_status(sci_req,
1976                                                     SCU_TASK_DONE_CHECK_RESPONSE,
1977                                                     SCI_FAILURE_IO_RESPONSE_VALID);
1978
1979                         sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
1980                 } else {
1981                         sci_change_state(&sci_req->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
1982                 }
1983                 return status;
1984         }
1985
1986         case SCI_REQ_STP_SOFT_RESET_WAIT_D2H: {
1987                 struct dev_to_host_fis *frame_header;
1988                 u32 *frame_buffer;
1989
1990                 status = scic_sds_unsolicited_frame_control_get_header(&scic->uf_control,
1991                                                                        frame_index,
1992                                                                        (void **)&frame_header);
1993                 if (status != SCI_SUCCESS) {
1994                         dev_err(scic_to_dev(scic),
1995                                 "%s: SCIC IO Request 0x%p could not get frame "
1996                                 "header for frame index %d, status %x\n",
1997                                 __func__,
1998                                 stp_req,
1999                                 frame_index,
2000                                 status);
2001                         return status;
2002                 }
2003
2004                 switch (frame_header->fis_type) {
2005                 case FIS_REGD2H:
2006                         scic_sds_unsolicited_frame_control_get_buffer(&scic->uf_control,
2007                                                                       frame_index,
2008                                                                       (void **)&frame_buffer);
2009
2010                         scic_sds_controller_copy_sata_response(&sci_req->stp.rsp,
2011                                                                frame_header,
2012                                                                frame_buffer);
2013
2014                         /* The command has completed with error */
2015                         scic_sds_request_set_status(sci_req,
2016                                                     SCU_TASK_DONE_CHECK_RESPONSE,
2017                                                     SCI_FAILURE_IO_RESPONSE_VALID);
2018                         break;
2019
2020                 default:
2021                         dev_warn(scic_to_dev(scic),
2022                                  "%s: IO Request:0x%p Frame Id:%d protocol "
2023                                  "violation occurred\n",
2024                                  __func__,
2025                                  stp_req,
2026                                  frame_index);
2027
2028                         scic_sds_request_set_status(sci_req,
2029                                                     SCU_TASK_DONE_UNEXP_FIS,
2030                                                     SCI_FAILURE_PROTOCOL_VIOLATION);
2031                         break;
2032                 }
2033
2034                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
2035
2036                 /* Frame has been decoded return it to the controller */
2037                 scic_sds_controller_release_frame(scic, frame_index);
2038
2039                 return status;
2040         }
2041         case SCI_REQ_ABORTING:
2042                 /*
2043                  * TODO: Is it even possible to get an unsolicited frame in the
2044                  * aborting state?
2045                  */
2046                 scic_sds_controller_release_frame(scic, frame_index);
2047                 return SCI_SUCCESS;
2048
2049         default:
2050                 dev_warn(scic_to_dev(scic),
2051                          "%s: SCIC IO Request given unexpected frame %x while "
2052                          "in state %d\n",
2053                          __func__,
2054                          frame_index,
2055                          state);
2056
2057                 scic_sds_controller_release_frame(scic, frame_index);
2058                 return SCI_FAILURE_INVALID_STATE;
2059         }
2060 }
2061
2062 static enum sci_status stp_request_udma_await_tc_event(struct scic_sds_request *sci_req,
2063                                                        u32 completion_code)
2064 {
2065         enum sci_status status = SCI_SUCCESS;
2066
2067         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
2068         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
2069                 scic_sds_stp_request_udma_complete_request(sci_req,
2070                                                            SCU_TASK_DONE_GOOD,
2071                                                            SCI_SUCCESS);
2072                 break;
2073         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_FIS):
2074         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_REG_ERR):
2075                 /* We must check ther response buffer to see if the D2H
2076                  * Register FIS was received before we got the TC
2077                  * completion.
2078                  */
2079                 if (sci_req->stp.rsp.fis_type == FIS_REGD2H) {
2080                         scic_sds_remote_device_suspend(sci_req->target_device,
2081                                 SCU_EVENT_SPECIFIC(SCU_NORMALIZE_COMPLETION_STATUS(completion_code)));
2082
2083                         scic_sds_stp_request_udma_complete_request(sci_req,
2084                                                                    SCU_TASK_DONE_CHECK_RESPONSE,
2085                                                                    SCI_FAILURE_IO_RESPONSE_VALID);
2086                 } else {
2087                         /* If we have an error completion status for the
2088                          * TC then we can expect a D2H register FIS from
2089                          * the device so we must change state to wait
2090                          * for it
2091                          */
2092                         sci_change_state(&sci_req->sm, SCI_REQ_STP_UDMA_WAIT_D2H);
2093                 }
2094                 break;
2095
2096         /* TODO Check to see if any of these completion status need to
2097          * wait for the device to host register fis.
2098          */
2099         /* TODO We can retry the command for SCU_TASK_DONE_CMD_LL_R_ERR
2100          * - this comes only for B0
2101          */
2102         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_INV_FIS_LEN):
2103         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_MAX_PLD_ERR):
2104         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LL_R_ERR):
2105         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_CMD_LL_R_ERR):
2106         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_CRC_ERR):
2107                 scic_sds_remote_device_suspend(sci_req->target_device,
2108                         SCU_EVENT_SPECIFIC(SCU_NORMALIZE_COMPLETION_STATUS(completion_code)));
2109         /* Fall through to the default case */
2110         default:
2111                 /* All other completion status cause the IO to be complete. */
2112                 scic_sds_stp_request_udma_complete_request(sci_req,
2113                                         SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
2114                                         SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR);
2115                 break;
2116         }
2117
2118         return status;
2119 }
2120
2121 static enum sci_status
2122 stp_request_soft_reset_await_h2d_asserted_tc_event(struct scic_sds_request *sci_req,
2123                                                    u32 completion_code)
2124 {
2125         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
2126         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
2127                 scic_sds_request_set_status(sci_req, SCU_TASK_DONE_GOOD,
2128                                             SCI_SUCCESS);
2129
2130                 sci_change_state(&sci_req->sm, SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG);
2131                 break;
2132
2133         default:
2134                 /*
2135                  * All other completion status cause the IO to be complete.
2136                  * If a NAK was received, then it is up to the user to retry
2137                  * the request.
2138                  */
2139                 scic_sds_request_set_status(sci_req,
2140                                             SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
2141                                             SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR);
2142
2143                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
2144                 break;
2145         }
2146
2147         return SCI_SUCCESS;
2148 }
2149
2150 static enum sci_status
2151 stp_request_soft_reset_await_h2d_diagnostic_tc_event(struct scic_sds_request *sci_req,
2152                                                      u32 completion_code)
2153 {
2154         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
2155         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
2156                 scic_sds_request_set_status(sci_req, SCU_TASK_DONE_GOOD,
2157                                             SCI_SUCCESS);
2158
2159                 sci_change_state(&sci_req->sm, SCI_REQ_STP_SOFT_RESET_WAIT_D2H);
2160                 break;
2161
2162         default:
2163                 /* All other completion status cause the IO to be complete.  If
2164                  * a NAK was received, then it is up to the user to retry the
2165                  * request.
2166                  */
2167                 scic_sds_request_set_status(sci_req,
2168                         SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
2169                         SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR);
2170
2171                 sci_change_state(&sci_req->sm, SCI_REQ_COMPLETED);
2172                 break;
2173         }
2174
2175         return SCI_SUCCESS;
2176 }
2177
2178 enum sci_status
2179 scic_sds_io_request_tc_completion(struct scic_sds_request *sci_req,
2180                                   u32 completion_code)
2181 {
2182         enum sci_base_request_states state;
2183         struct scic_sds_controller *scic = sci_req->owning_controller;
2184
2185         state = sci_req->sm.current_state_id;
2186
2187         switch (state) {
2188         case SCI_REQ_STARTED:
2189                 return request_started_state_tc_event(sci_req, completion_code);
2190
2191         case SCI_REQ_TASK_WAIT_TC_COMP:
2192                 return ssp_task_request_await_tc_event(sci_req,
2193                                                        completion_code);
2194
2195         case SCI_REQ_SMP_WAIT_RESP:
2196                 return smp_request_await_response_tc_event(sci_req,
2197                                                            completion_code);
2198
2199         case SCI_REQ_SMP_WAIT_TC_COMP:
2200                 return smp_request_await_tc_event(sci_req, completion_code);
2201
2202         case SCI_REQ_STP_UDMA_WAIT_TC_COMP:
2203                 return stp_request_udma_await_tc_event(sci_req,
2204                                                        completion_code);
2205
2206         case SCI_REQ_STP_NON_DATA_WAIT_H2D:
2207                 return stp_request_non_data_await_h2d_tc_event(sci_req,
2208                                                                completion_code);
2209
2210         case SCI_REQ_STP_PIO_WAIT_H2D:
2211                 return stp_request_pio_await_h2d_completion_tc_event(sci_req,
2212                                                                      completion_code);
2213
2214         case SCI_REQ_STP_PIO_DATA_OUT:
2215                 return pio_data_out_tx_done_tc_event(sci_req, completion_code);
2216
2217         case SCI_REQ_STP_SOFT_RESET_WAIT_H2D_ASSERTED:
2218                 return stp_request_soft_reset_await_h2d_asserted_tc_event(sci_req,
2219                                                                           completion_code);
2220
2221         case SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG:
2222                 return stp_request_soft_reset_await_h2d_diagnostic_tc_event(sci_req,
2223                                                                             completion_code);
2224
2225         case SCI_REQ_ABORTING:
2226                 return request_aborting_state_tc_event(sci_req,
2227                                                        completion_code);
2228
2229         default:
2230                 dev_warn(scic_to_dev(scic),
2231                          "%s: SCIC IO Request given task completion "
2232                          "notification %x while in wrong state %d\n",
2233                          __func__,
2234                          completion_code,
2235                          state);
2236                 return SCI_FAILURE_INVALID_STATE;
2237         }
2238 }
2239
2240 /**
2241  * isci_request_process_response_iu() - This function sets the status and
2242  *    response iu, in the task struct, from the request object for the upper
2243  *    layer driver.
2244  * @sas_task: This parameter is the task struct from the upper layer driver.
2245  * @resp_iu: This parameter points to the response iu of the completed request.
2246  * @dev: This parameter specifies the linux device struct.
2247  *
2248  * none.
2249  */
2250 static void isci_request_process_response_iu(
2251         struct sas_task *task,
2252         struct ssp_response_iu *resp_iu,
2253         struct device *dev)
2254 {
2255         dev_dbg(dev,
2256                 "%s: resp_iu = %p "
2257                 "resp_iu->status = 0x%x,\nresp_iu->datapres = %d "
2258                 "resp_iu->response_data_len = %x, "
2259                 "resp_iu->sense_data_len = %x\nrepsonse data: ",
2260                 __func__,
2261                 resp_iu,
2262                 resp_iu->status,
2263                 resp_iu->datapres,
2264                 resp_iu->response_data_len,
2265                 resp_iu->sense_data_len);
2266
2267         task->task_status.stat = resp_iu->status;
2268
2269         /* libsas updates the task status fields based on the response iu. */
2270         sas_ssp_task_response(dev, task, resp_iu);
2271 }
2272
2273 /**
2274  * isci_request_set_open_reject_status() - This function prepares the I/O
2275  *    completion for OPEN_REJECT conditions.
2276  * @request: This parameter is the completed isci_request object.
2277  * @response_ptr: This parameter specifies the service response for the I/O.
2278  * @status_ptr: This parameter specifies the exec status for the I/O.
2279  * @complete_to_host_ptr: This parameter specifies the action to be taken by
2280  *    the LLDD with respect to completing this request or forcing an abort
2281  *    condition on the I/O.
2282  * @open_rej_reason: This parameter specifies the encoded reason for the
2283  *    abandon-class reject.
2284  *
2285  * none.
2286  */
2287 static void isci_request_set_open_reject_status(
2288         struct isci_request *request,
2289         struct sas_task *task,
2290         enum service_response *response_ptr,
2291         enum exec_status *status_ptr,
2292         enum isci_completion_selection *complete_to_host_ptr,
2293         enum sas_open_rej_reason open_rej_reason)
2294 {
2295         /* Task in the target is done. */
2296         request->complete_in_target       = true;
2297         *response_ptr                     = SAS_TASK_UNDELIVERED;
2298         *status_ptr                       = SAS_OPEN_REJECT;
2299         *complete_to_host_ptr             = isci_perform_normal_io_completion;
2300         task->task_status.open_rej_reason = open_rej_reason;
2301 }
2302
2303 /**
2304  * isci_request_handle_controller_specific_errors() - This function decodes
2305  *    controller-specific I/O completion error conditions.
2306  * @request: This parameter is the completed isci_request object.
2307  * @response_ptr: This parameter specifies the service response for the I/O.
2308  * @status_ptr: This parameter specifies the exec status for the I/O.
2309  * @complete_to_host_ptr: This parameter specifies the action to be taken by
2310  *    the LLDD with respect to completing this request or forcing an abort
2311  *    condition on the I/O.
2312  *
2313  * none.
2314  */
2315 static void isci_request_handle_controller_specific_errors(
2316         struct isci_remote_device *isci_device,
2317         struct isci_request *request,
2318         struct sas_task *task,
2319         enum service_response *response_ptr,
2320         enum exec_status *status_ptr,
2321         enum isci_completion_selection *complete_to_host_ptr)
2322 {
2323         unsigned int cstatus;
2324
2325         cstatus = request->sci.scu_status;
2326
2327         dev_dbg(&request->isci_host->pdev->dev,
2328                 "%s: %p SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR "
2329                 "- controller status = 0x%x\n",
2330                 __func__, request, cstatus);
2331
2332         /* Decode the controller-specific errors; most
2333          * important is to recognize those conditions in which
2334          * the target may still have a task outstanding that
2335          * must be aborted.
2336          *
2337          * Note that there are SCU completion codes being
2338          * named in the decode below for which SCIC has already
2339          * done work to handle them in a way other than as
2340          * a controller-specific completion code; these are left
2341          * in the decode below for completeness sake.
2342          */
2343         switch (cstatus) {
2344         case SCU_TASK_DONE_DMASETUP_DIRERR:
2345         /* Also SCU_TASK_DONE_SMP_FRM_TYPE_ERR: */
2346         case SCU_TASK_DONE_XFERCNT_ERR:
2347                 /* Also SCU_TASK_DONE_SMP_UFI_ERR: */
2348                 if (task->task_proto == SAS_PROTOCOL_SMP) {
2349                         /* SCU_TASK_DONE_SMP_UFI_ERR == Task Done. */
2350                         *response_ptr = SAS_TASK_COMPLETE;
2351
2352                         /* See if the device has been/is being stopped. Note
2353                          * that we ignore the quiesce state, since we are
2354                          * concerned about the actual device state.
2355                          */
2356                         if ((isci_device->status == isci_stopping) ||
2357                             (isci_device->status == isci_stopped))
2358                                 *status_ptr = SAS_DEVICE_UNKNOWN;
2359                         else
2360                                 *status_ptr = SAS_ABORTED_TASK;
2361
2362                         request->complete_in_target = true;
2363
2364                         *complete_to_host_ptr =
2365                                 isci_perform_normal_io_completion;
2366                 } else {
2367                         /* Task in the target is not done. */
2368                         *response_ptr = SAS_TASK_UNDELIVERED;
2369
2370                         if ((isci_device->status == isci_stopping) ||
2371                             (isci_device->status == isci_stopped))
2372                                 *status_ptr = SAS_DEVICE_UNKNOWN;
2373                         else
2374                                 *status_ptr = SAM_STAT_TASK_ABORTED;
2375
2376                         request->complete_in_target = false;
2377
2378                         *complete_to_host_ptr =
2379                                 isci_perform_error_io_completion;
2380                 }
2381
2382                 break;
2383
2384         case SCU_TASK_DONE_CRC_ERR:
2385         case SCU_TASK_DONE_NAK_CMD_ERR:
2386         case SCU_TASK_DONE_EXCESS_DATA:
2387         case SCU_TASK_DONE_UNEXP_FIS:
2388         /* Also SCU_TASK_DONE_UNEXP_RESP: */
2389         case SCU_TASK_DONE_VIIT_ENTRY_NV:       /* TODO - conditions? */
2390         case SCU_TASK_DONE_IIT_ENTRY_NV:        /* TODO - conditions? */
2391         case SCU_TASK_DONE_RNCNV_OUTBOUND:      /* TODO - conditions? */
2392                 /* These are conditions in which the target
2393                  * has completed the task, so that no cleanup
2394                  * is necessary.
2395                  */
2396                 *response_ptr = SAS_TASK_COMPLETE;
2397
2398                 /* See if the device has been/is being stopped. Note
2399                  * that we ignore the quiesce state, since we are
2400                  * concerned about the actual device state.
2401                  */
2402                 if ((isci_device->status == isci_stopping) ||
2403                     (isci_device->status == isci_stopped))
2404                         *status_ptr = SAS_DEVICE_UNKNOWN;
2405                 else
2406                         *status_ptr = SAS_ABORTED_TASK;
2407
2408                 request->complete_in_target = true;
2409
2410                 *complete_to_host_ptr = isci_perform_normal_io_completion;
2411                 break;
2412
2413
2414         /* Note that the only open reject completion codes seen here will be
2415          * abandon-class codes; all others are automatically retried in the SCU.
2416          */
2417         case SCU_TASK_OPEN_REJECT_WRONG_DESTINATION:
2418
2419                 isci_request_set_open_reject_status(
2420                         request, task, response_ptr, status_ptr,
2421                         complete_to_host_ptr, SAS_OREJ_WRONG_DEST);
2422                 break;
2423
2424         case SCU_TASK_OPEN_REJECT_ZONE_VIOLATION:
2425
2426                 /* Note - the return of AB0 will change when
2427                  * libsas implements detection of zone violations.
2428                  */
2429                 isci_request_set_open_reject_status(
2430                         request, task, response_ptr, status_ptr,
2431                         complete_to_host_ptr, SAS_OREJ_RESV_AB0);
2432                 break;
2433
2434         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1:
2435
2436                 isci_request_set_open_reject_status(
2437                         request, task, response_ptr, status_ptr,
2438                         complete_to_host_ptr, SAS_OREJ_RESV_AB1);
2439                 break;
2440
2441         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2:
2442
2443                 isci_request_set_open_reject_status(
2444                         request, task, response_ptr, status_ptr,
2445                         complete_to_host_ptr, SAS_OREJ_RESV_AB2);
2446                 break;
2447
2448         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_3:
2449
2450                 isci_request_set_open_reject_status(
2451                         request, task, response_ptr, status_ptr,
2452                         complete_to_host_ptr, SAS_OREJ_RESV_AB3);
2453                 break;
2454
2455         case SCU_TASK_OPEN_REJECT_BAD_DESTINATION:
2456
2457                 isci_request_set_open_reject_status(
2458                         request, task, response_ptr, status_ptr,
2459                         complete_to_host_ptr, SAS_OREJ_BAD_DEST);
2460                 break;
2461
2462         case SCU_TASK_OPEN_REJECT_STP_RESOURCES_BUSY:
2463
2464                 isci_request_set_open_reject_status(
2465                         request, task, response_ptr, status_ptr,
2466                         complete_to_host_ptr, SAS_OREJ_STP_NORES);
2467                 break;
2468
2469         case SCU_TASK_OPEN_REJECT_PROTOCOL_NOT_SUPPORTED:
2470
2471                 isci_request_set_open_reject_status(
2472                         request, task, response_ptr, status_ptr,
2473                         complete_to_host_ptr, SAS_OREJ_EPROTO);
2474                 break;
2475
2476         case SCU_TASK_OPEN_REJECT_CONNECTION_RATE_NOT_SUPPORTED:
2477
2478                 isci_request_set_open_reject_status(
2479                         request, task, response_ptr, status_ptr,
2480                         complete_to_host_ptr, SAS_OREJ_CONN_RATE);
2481                 break;
2482
2483         case SCU_TASK_DONE_LL_R_ERR:
2484         /* Also SCU_TASK_DONE_ACK_NAK_TO: */
2485         case SCU_TASK_DONE_LL_PERR:
2486         case SCU_TASK_DONE_LL_SY_TERM:
2487         /* Also SCU_TASK_DONE_NAK_ERR:*/
2488         case SCU_TASK_DONE_LL_LF_TERM:
2489         /* Also SCU_TASK_DONE_DATA_LEN_ERR: */
2490         case SCU_TASK_DONE_LL_ABORT_ERR:
2491         case SCU_TASK_DONE_SEQ_INV_TYPE:
2492         /* Also SCU_TASK_DONE_UNEXP_XR: */
2493         case SCU_TASK_DONE_XR_IU_LEN_ERR:
2494         case SCU_TASK_DONE_INV_FIS_LEN:
2495         /* Also SCU_TASK_DONE_XR_WD_LEN: */
2496         case SCU_TASK_DONE_SDMA_ERR:
2497         case SCU_TASK_DONE_OFFSET_ERR:
2498         case SCU_TASK_DONE_MAX_PLD_ERR:
2499         case SCU_TASK_DONE_LF_ERR:
2500         case SCU_TASK_DONE_SMP_RESP_TO_ERR:  /* Escalate to dev reset? */
2501         case SCU_TASK_DONE_SMP_LL_RX_ERR:
2502         case SCU_TASK_DONE_UNEXP_DATA:
2503         case SCU_TASK_DONE_UNEXP_SDBFIS:
2504         case SCU_TASK_DONE_REG_ERR:
2505         case SCU_TASK_DONE_SDB_ERR:
2506         case SCU_TASK_DONE_TASK_ABORT:
2507         default:
2508                 /* Task in the target is not done. */
2509                 *response_ptr = SAS_TASK_UNDELIVERED;
2510                 *status_ptr = SAM_STAT_TASK_ABORTED;
2511
2512                 if (task->task_proto == SAS_PROTOCOL_SMP) {
2513                         request->complete_in_target = true;
2514
2515                         *complete_to_host_ptr = isci_perform_normal_io_completion;
2516                 } else {
2517                         request->complete_in_target = false;
2518
2519                         *complete_to_host_ptr = isci_perform_error_io_completion;
2520                 }
2521                 break;
2522         }
2523 }
2524
2525 /**
2526  * isci_task_save_for_upper_layer_completion() - This function saves the
2527  *    request for later completion to the upper layer driver.
2528  * @host: This parameter is a pointer to the host on which the the request
2529  *    should be queued (either as an error or success).
2530  * @request: This parameter is the completed request.
2531  * @response: This parameter is the response code for the completed task.
2532  * @status: This parameter is the status code for the completed task.
2533  *
2534  * none.
2535  */
2536 static void isci_task_save_for_upper_layer_completion(
2537         struct isci_host *host,
2538         struct isci_request *request,
2539         enum service_response response,
2540         enum exec_status status,
2541         enum isci_completion_selection task_notification_selection)
2542 {
2543         struct sas_task *task = isci_request_access_task(request);
2544
2545         task_notification_selection
2546                 = isci_task_set_completion_status(task, response, status,
2547                                                   task_notification_selection);
2548
2549         /* Tasks aborted specifically by a call to the lldd_abort_task
2550          * function should not be completed to the host in the regular path.
2551          */
2552         switch (task_notification_selection) {
2553
2554         case isci_perform_normal_io_completion:
2555
2556                 /* Normal notification (task_done) */
2557                 dev_dbg(&host->pdev->dev,
2558                         "%s: Normal - task = %p, response=%d (%d), status=%d (%d)\n",
2559                         __func__,
2560                         task,
2561                         task->task_status.resp, response,
2562                         task->task_status.stat, status);
2563                 /* Add to the completed list. */
2564                 list_add(&request->completed_node,
2565                          &host->requests_to_complete);
2566
2567                 /* Take the request off the device's pending request list. */
2568                 list_del_init(&request->dev_node);
2569                 break;
2570
2571         case isci_perform_aborted_io_completion:
2572                 /* No notification to libsas because this request is
2573                  * already in the abort path.
2574                  */
2575                 dev_warn(&host->pdev->dev,
2576                          "%s: Aborted - task = %p, response=%d (%d), status=%d (%d)\n",
2577                          __func__,
2578                          task,
2579                          task->task_status.resp, response,
2580                          task->task_status.stat, status);
2581
2582                 /* Wake up whatever process was waiting for this
2583                  * request to complete.
2584                  */
2585                 WARN_ON(request->io_request_completion == NULL);
2586
2587                 if (request->io_request_completion != NULL) {
2588
2589                         /* Signal whoever is waiting that this
2590                         * request is complete.
2591                         */
2592                         complete(request->io_request_completion);
2593                 }
2594                 break;
2595
2596         case isci_perform_error_io_completion:
2597                 /* Use sas_task_abort */
2598                 dev_warn(&host->pdev->dev,
2599                          "%s: Error - task = %p, response=%d (%d), status=%d (%d)\n",
2600                          __func__,
2601                          task,
2602                          task->task_status.resp, response,
2603                          task->task_status.stat, status);
2604                 /* Add to the aborted list. */
2605                 list_add(&request->completed_node,
2606                          &host->requests_to_errorback);
2607                 break;
2608
2609         default:
2610                 dev_warn(&host->pdev->dev,
2611                          "%s: Unknown - task = %p, response=%d (%d), status=%d (%d)\n",
2612                          __func__,
2613                          task,
2614                          task->task_status.resp, response,
2615                          task->task_status.stat, status);
2616
2617                 /* Add to the error to libsas list. */
2618                 list_add(&request->completed_node,
2619                          &host->requests_to_errorback);
2620                 break;
2621         }
2622 }
2623
2624 static void isci_request_io_request_complete(struct isci_host *isci_host,
2625                                              struct isci_request *request,
2626                                              enum sci_io_status completion_status)
2627 {
2628         struct sas_task *task = isci_request_access_task(request);
2629         struct ssp_response_iu *resp_iu;
2630         void *resp_buf;
2631         unsigned long task_flags;
2632         struct isci_remote_device *isci_device   = request->isci_device;
2633         enum service_response response       = SAS_TASK_UNDELIVERED;
2634         enum exec_status status         = SAS_ABORTED_TASK;
2635         enum isci_request_status request_status;
2636         enum isci_completion_selection complete_to_host
2637                 = isci_perform_normal_io_completion;
2638
2639         dev_dbg(&isci_host->pdev->dev,
2640                 "%s: request = %p, task = %p,\n"
2641                 "task->data_dir = %d completion_status = 0x%x\n",
2642                 __func__,
2643                 request,
2644                 task,
2645                 task->data_dir,
2646                 completion_status);
2647
2648         spin_lock(&request->state_lock);
2649         request_status = isci_request_get_state(request);
2650
2651         /* Decode the request status.  Note that if the request has been
2652          * aborted by a task management function, we don't care
2653          * what the status is.
2654          */
2655         switch (request_status) {
2656
2657         case aborted:
2658                 /* "aborted" indicates that the request was aborted by a task
2659                  * management function, since once a task management request is
2660                  * perfomed by the device, the request only completes because
2661                  * of the subsequent driver terminate.
2662                  *
2663                  * Aborted also means an external thread is explicitly managing
2664                  * this request, so that we do not complete it up the stack.
2665                  *
2666                  * The target is still there (since the TMF was successful).
2667                  */
2668                 request->complete_in_target = true;
2669                 response = SAS_TASK_COMPLETE;
2670
2671                 /* See if the device has been/is being stopped. Note
2672                  * that we ignore the quiesce state, since we are
2673                  * concerned about the actual device state.
2674                  */
2675                 if ((isci_device->status == isci_stopping)
2676                     || (isci_device->status == isci_stopped)
2677                     )
2678                         status = SAS_DEVICE_UNKNOWN;
2679                 else
2680                         status = SAS_ABORTED_TASK;
2681
2682                 complete_to_host = isci_perform_aborted_io_completion;
2683                 /* This was an aborted request. */
2684
2685                 spin_unlock(&request->state_lock);
2686                 break;
2687
2688         case aborting:
2689                 /* aborting means that the task management function tried and
2690                  * failed to abort the request. We need to note the request
2691                  * as SAS_TASK_UNDELIVERED, so that the scsi mid layer marks the
2692                  * target as down.
2693                  *
2694                  * Aborting also means an external thread is explicitly managing
2695                  * this request, so that we do not complete it up the stack.
2696                  */
2697                 request->complete_in_target = true;
2698                 response = SAS_TASK_UNDELIVERED;
2699
2700                 if ((isci_device->status == isci_stopping) ||
2701                     (isci_device->status == isci_stopped))
2702                         /* The device has been /is being stopped. Note that
2703                          * we ignore the quiesce state, since we are
2704                          * concerned about the actual device state.
2705                          */
2706                         status = SAS_DEVICE_UNKNOWN;
2707                 else
2708                         status = SAS_PHY_DOWN;
2709
2710                 complete_to_host = isci_perform_aborted_io_completion;
2711
2712                 /* This was an aborted request. */
2713
2714                 spin_unlock(&request->state_lock);
2715                 break;
2716
2717         case terminating:
2718
2719                 /* This was an terminated request.  This happens when
2720                  * the I/O is being terminated because of an action on
2721                  * the device (reset, tear down, etc.), and the I/O needs
2722                  * to be completed up the stack.
2723                  */
2724                 request->complete_in_target = true;
2725                 response = SAS_TASK_UNDELIVERED;
2726
2727                 /* See if the device has been/is being stopped. Note
2728                  * that we ignore the quiesce state, since we are
2729                  * concerned about the actual device state.
2730                  */
2731                 if ((isci_device->status == isci_stopping) ||
2732                     (isci_device->status == isci_stopped))
2733                         status = SAS_DEVICE_UNKNOWN;
2734                 else
2735                         status = SAS_ABORTED_TASK;
2736
2737                 complete_to_host = isci_perform_aborted_io_completion;
2738
2739                 /* This was a terminated request. */
2740
2741                 spin_unlock(&request->state_lock);
2742                 break;
2743
2744         default:
2745
2746                 /* The request is done from an SCU HW perspective. */
2747                 request->status = completed;
2748
2749                 spin_unlock(&request->state_lock);
2750
2751                 /* This is an active request being completed from the core. */
2752                 switch (completion_status) {
2753
2754                 case SCI_IO_FAILURE_RESPONSE_VALID:
2755                         dev_dbg(&isci_host->pdev->dev,
2756                                 "%s: SCI_IO_FAILURE_RESPONSE_VALID (%p/%p)\n",
2757                                 __func__,
2758                                 request,
2759                                 task);
2760
2761                         if (sas_protocol_ata(task->task_proto)) {
2762                                 resp_buf = &request->sci.stp.rsp;
2763                                 isci_request_process_stp_response(task,
2764                                                                   resp_buf);
2765                         } else if (SAS_PROTOCOL_SSP == task->task_proto) {
2766
2767                                 /* crack the iu response buffer. */
2768                                 resp_iu = &request->sci.ssp.rsp;
2769                                 isci_request_process_response_iu(task, resp_iu,
2770                                                                  &isci_host->pdev->dev);
2771
2772                         } else if (SAS_PROTOCOL_SMP == task->task_proto) {
2773
2774                                 dev_err(&isci_host->pdev->dev,
2775                                         "%s: SCI_IO_FAILURE_RESPONSE_VALID: "
2776                                         "SAS_PROTOCOL_SMP protocol\n",
2777                                         __func__);
2778
2779                         } else
2780                                 dev_err(&isci_host->pdev->dev,
2781                                         "%s: unknown protocol\n", __func__);
2782
2783                         /* use the task status set in the task struct by the
2784                          * isci_request_process_response_iu call.
2785                          */
2786                         request->complete_in_target = true;
2787                         response = task->task_status.resp;
2788                         status = task->task_status.stat;
2789                         break;
2790
2791                 case SCI_IO_SUCCESS:
2792                 case SCI_IO_SUCCESS_IO_DONE_EARLY:
2793
2794                         response = SAS_TASK_COMPLETE;
2795                         status   = SAM_STAT_GOOD;
2796                         request->complete_in_target = true;
2797
2798                         if (task->task_proto == SAS_PROTOCOL_SMP) {
2799                                 void *rsp = &request->sci.smp.rsp;
2800
2801                                 dev_dbg(&isci_host->pdev->dev,
2802                                         "%s: SMP protocol completion\n",
2803                                         __func__);
2804
2805                                 sg_copy_from_buffer(
2806                                         &task->smp_task.smp_resp, 1,
2807                                         rsp, sizeof(struct smp_resp));
2808                         } else if (completion_status
2809                                    == SCI_IO_SUCCESS_IO_DONE_EARLY) {
2810
2811                                 /* This was an SSP / STP / SATA transfer.
2812                                  * There is a possibility that less data than
2813                                  * the maximum was transferred.
2814                                  */
2815                                 u32 transferred_length = sci_req_tx_bytes(&request->sci);
2816
2817                                 task->task_status.residual
2818                                         = task->total_xfer_len - transferred_length;
2819
2820                                 /* If there were residual bytes, call this an
2821                                  * underrun.
2822                                  */
2823                                 if (task->task_status.residual != 0)
2824                                         status = SAS_DATA_UNDERRUN;
2825
2826                                 dev_dbg(&isci_host->pdev->dev,
2827                                         "%s: SCI_IO_SUCCESS_IO_DONE_EARLY %d\n",
2828                                         __func__,
2829                                         status);
2830
2831                         } else
2832                                 dev_dbg(&isci_host->pdev->dev,
2833                                         "%s: SCI_IO_SUCCESS\n",
2834                                         __func__);
2835
2836                         break;
2837
2838                 case SCI_IO_FAILURE_TERMINATED:
2839                         dev_dbg(&isci_host->pdev->dev,
2840                                 "%s: SCI_IO_FAILURE_TERMINATED (%p/%p)\n",
2841                                 __func__,
2842                                 request,
2843                                 task);
2844
2845                         /* The request was terminated explicitly.  No handling
2846                          * is needed in the SCSI error handler path.
2847                          */
2848                         request->complete_in_target = true;
2849                         response = SAS_TASK_UNDELIVERED;
2850
2851                         /* See if the device has been/is being stopped. Note
2852                          * that we ignore the quiesce state, since we are
2853                          * concerned about the actual device state.
2854                          */
2855                         if ((isci_device->status == isci_stopping) ||
2856                             (isci_device->status == isci_stopped))
2857                                 status = SAS_DEVICE_UNKNOWN;
2858                         else
2859                                 status = SAS_ABORTED_TASK;
2860
2861                         complete_to_host = isci_perform_normal_io_completion;
2862                         break;
2863
2864                 case SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR:
2865
2866                         isci_request_handle_controller_specific_errors(
2867                                 isci_device, request, task, &response, &status,
2868                                 &complete_to_host);
2869
2870                         break;
2871
2872                 case SCI_IO_FAILURE_REMOTE_DEVICE_RESET_REQUIRED:
2873                         /* This is a special case, in that the I/O completion
2874                          * is telling us that the device needs a reset.
2875                          * In order for the device reset condition to be
2876                          * noticed, the I/O has to be handled in the error
2877                          * handler.  Set the reset flag and cause the
2878                          * SCSI error thread to be scheduled.
2879                          */
2880                         spin_lock_irqsave(&task->task_state_lock, task_flags);
2881                         task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
2882                         spin_unlock_irqrestore(&task->task_state_lock, task_flags);
2883
2884                         /* Fail the I/O. */
2885                         response = SAS_TASK_UNDELIVERED;
2886                         status = SAM_STAT_TASK_ABORTED;
2887
2888                         complete_to_host = isci_perform_error_io_completion;
2889                         request->complete_in_target = false;
2890                         break;
2891
2892                 case SCI_FAILURE_RETRY_REQUIRED:
2893
2894                         /* Fail the I/O so it can be retried. */
2895                         response = SAS_TASK_UNDELIVERED;
2896                         if ((isci_device->status == isci_stopping) ||
2897                             (isci_device->status == isci_stopped))
2898                                 status = SAS_DEVICE_UNKNOWN;
2899                         else
2900                                 status = SAS_ABORTED_TASK;
2901
2902                         complete_to_host = isci_perform_normal_io_completion;
2903                         request->complete_in_target = true;
2904                         break;
2905
2906
2907                 default:
2908                         /* Catch any otherwise unhandled error codes here. */
2909                         dev_warn(&isci_host->pdev->dev,
2910                                  "%s: invalid completion code: 0x%x - "
2911                                  "isci_request = %p\n",
2912                                  __func__, completion_status, request);
2913
2914                         response = SAS_TASK_UNDELIVERED;
2915
2916                         /* See if the device has been/is being stopped. Note
2917                          * that we ignore the quiesce state, since we are
2918                          * concerned about the actual device state.
2919                          */
2920                         if ((isci_device->status == isci_stopping) ||
2921                             (isci_device->status == isci_stopped))
2922                                 status = SAS_DEVICE_UNKNOWN;
2923                         else
2924                                 status = SAS_ABORTED_TASK;
2925
2926                         if (SAS_PROTOCOL_SMP == task->task_proto) {
2927                                 request->complete_in_target = true;
2928                                 complete_to_host = isci_perform_normal_io_completion;
2929                         } else {
2930                                 request->complete_in_target = false;
2931                                 complete_to_host = isci_perform_error_io_completion;
2932                         }
2933                         break;
2934                 }
2935                 break;
2936         }
2937
2938         isci_request_unmap_sgl(request, isci_host->pdev);
2939
2940         /* Put the completed request on the correct list */
2941         isci_task_save_for_upper_layer_completion(isci_host, request, response,
2942                                                   status, complete_to_host
2943                                                   );
2944
2945         /* complete the io request to the core. */
2946         scic_controller_complete_io(&isci_host->sci,
2947                                     &isci_device->sci,
2948                                     &request->sci);
2949         /* set terminated handle so it cannot be completed or
2950          * terminated again, and to cause any calls into abort
2951          * task to recognize the already completed case.
2952          */
2953         request->terminated = true;
2954
2955         isci_host_can_dequeue(isci_host, 1);
2956 }
2957
2958 static void scic_sds_request_started_state_enter(struct sci_base_state_machine *sm)
2959 {
2960         struct scic_sds_request *sci_req = container_of(sm, typeof(*sci_req), sm);
2961         struct isci_request *ireq = sci_req_to_ireq(sci_req);
2962         struct domain_device *dev = sci_dev_to_domain(sci_req->target_device);
2963         struct sas_task *task;
2964
2965         /* XXX as hch said always creating an internal sas_task for tmf
2966          * requests would simplify the driver
2967          */
2968         task = ireq->ttype == io_task ? isci_request_access_task(ireq) : NULL;
2969
2970         /* all unaccelerated request types (non ssp or ncq) handled with
2971          * substates
2972          */
2973         if (!task && dev->dev_type == SAS_END_DEV) {
2974                 sci_change_state(sm, SCI_REQ_TASK_WAIT_TC_COMP);
2975         } else if (!task &&
2976                    (isci_request_access_tmf(ireq)->tmf_code == isci_tmf_sata_srst_high ||
2977                     isci_request_access_tmf(ireq)->tmf_code == isci_tmf_sata_srst_low)) {
2978                 sci_change_state(sm, SCI_REQ_STP_SOFT_RESET_WAIT_H2D_ASSERTED);
2979         } else if (task && task->task_proto == SAS_PROTOCOL_SMP) {
2980                 sci_change_state(sm, SCI_REQ_SMP_WAIT_RESP);
2981         } else if (task && sas_protocol_ata(task->task_proto) &&
2982                    !task->ata_task.use_ncq) {
2983                 u32 state;
2984
2985                 if (task->data_dir == DMA_NONE)
2986                         state = SCI_REQ_STP_NON_DATA_WAIT_H2D;
2987                 else if (task->ata_task.dma_xfer)
2988                         state = SCI_REQ_STP_UDMA_WAIT_TC_COMP;
2989                 else /* PIO */
2990                         state = SCI_REQ_STP_PIO_WAIT_H2D;
2991
2992                 sci_change_state(sm, state);
2993         }
2994 }
2995
2996 static void scic_sds_request_completed_state_enter(struct sci_base_state_machine *sm)
2997 {
2998         struct scic_sds_request *sci_req = container_of(sm, typeof(*sci_req), sm);
2999         struct scic_sds_controller *scic = sci_req->owning_controller;
3000         struct isci_host *ihost = scic_to_ihost(scic);
3001         struct isci_request *ireq = sci_req_to_ireq(sci_req);
3002
3003         /* Tell the SCI_USER that the IO request is complete */
3004         if (sci_req->is_task_management_request == false)
3005                 isci_request_io_request_complete(ihost, ireq,
3006                                                  sci_req->sci_status);
3007         else
3008                 isci_task_request_complete(ihost, ireq, sci_req->sci_status);
3009 }
3010
3011 static void scic_sds_request_aborting_state_enter(struct sci_base_state_machine *sm)
3012 {
3013         struct scic_sds_request *sci_req = container_of(sm, typeof(*sci_req), sm);
3014
3015         /* Setting the abort bit in the Task Context is required by the silicon. */
3016         sci_req->task_context_buffer->abort = 1;
3017 }
3018
3019 static void scic_sds_stp_request_started_non_data_await_h2d_completion_enter(struct sci_base_state_machine *sm)
3020 {
3021         struct scic_sds_request *sci_req = container_of(sm, typeof(*sci_req), sm);
3022
3023         scic_sds_remote_device_set_working_request(sci_req->target_device,
3024                                                    sci_req);
3025 }
3026
3027 static void scic_sds_stp_request_started_pio_await_h2d_completion_enter(struct sci_base_state_machine *sm)
3028 {
3029         struct scic_sds_request *sci_req = container_of(sm, typeof(*sci_req), sm);
3030
3031         scic_sds_remote_device_set_working_request(sci_req->target_device,
3032                                                    sci_req);
3033 }
3034
3035 static void scic_sds_stp_request_started_soft_reset_await_h2d_asserted_completion_enter(struct sci_base_state_machine *sm)
3036 {
3037         struct scic_sds_request *sci_req = container_of(sm, typeof(*sci_req), sm);
3038
3039         scic_sds_remote_device_set_working_request(sci_req->target_device,
3040                                                    sci_req);
3041 }
3042
3043 static void scic_sds_stp_request_started_soft_reset_await_h2d_diagnostic_completion_enter(struct sci_base_state_machine *sm)
3044 {
3045         struct scic_sds_request *sci_req = container_of(sm, typeof(*sci_req), sm);
3046         struct scu_task_context *task_context;
3047         struct host_to_dev_fis *h2d_fis;
3048         enum sci_status status;
3049
3050         /* Clear the SRST bit */
3051         h2d_fis = &sci_req->stp.cmd;
3052         h2d_fis->control = 0;
3053
3054         /* Clear the TC control bit */
3055         task_context = scic_sds_controller_get_task_context_buffer(
3056                 sci_req->owning_controller, sci_req->io_tag);
3057         task_context->control_frame = 0;
3058
3059         status = scic_controller_continue_io(sci_req);
3060         WARN_ONCE(status != SCI_SUCCESS, "isci: continue io failure\n");
3061 }
3062
3063 static const struct sci_base_state scic_sds_request_state_table[] = {
3064         [SCI_REQ_INIT] = { },
3065         [SCI_REQ_CONSTRUCTED] = { },
3066         [SCI_REQ_STARTED] = {
3067                 .enter_state = scic_sds_request_started_state_enter,
3068         },
3069         [SCI_REQ_STP_NON_DATA_WAIT_H2D] = {
3070                 .enter_state = scic_sds_stp_request_started_non_data_await_h2d_completion_enter,
3071         },
3072         [SCI_REQ_STP_NON_DATA_WAIT_D2H] = { },
3073         [SCI_REQ_STP_PIO_WAIT_H2D] = {
3074                 .enter_state = scic_sds_stp_request_started_pio_await_h2d_completion_enter,
3075         },
3076         [SCI_REQ_STP_PIO_WAIT_FRAME] = { },
3077         [SCI_REQ_STP_PIO_DATA_IN] = { },
3078         [SCI_REQ_STP_PIO_DATA_OUT] = { },
3079         [SCI_REQ_STP_UDMA_WAIT_TC_COMP] = { },
3080         [SCI_REQ_STP_UDMA_WAIT_D2H] = { },
3081         [SCI_REQ_STP_SOFT_RESET_WAIT_H2D_ASSERTED] = {
3082                 .enter_state = scic_sds_stp_request_started_soft_reset_await_h2d_asserted_completion_enter,
3083         },
3084         [SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG] = {
3085                 .enter_state = scic_sds_stp_request_started_soft_reset_await_h2d_diagnostic_completion_enter,
3086         },
3087         [SCI_REQ_STP_SOFT_RESET_WAIT_D2H] = { },
3088         [SCI_REQ_TASK_WAIT_TC_COMP] = { },
3089         [SCI_REQ_TASK_WAIT_TC_RESP] = { },
3090         [SCI_REQ_SMP_WAIT_RESP] = { },
3091         [SCI_REQ_SMP_WAIT_TC_COMP] = { },
3092         [SCI_REQ_COMPLETED] = {
3093                 .enter_state = scic_sds_request_completed_state_enter,
3094         },
3095         [SCI_REQ_ABORTING] = {
3096                 .enter_state = scic_sds_request_aborting_state_enter,
3097         },
3098         [SCI_REQ_FINAL] = { },
3099 };
3100
3101 static void
3102 scic_sds_general_request_construct(struct scic_sds_controller *scic,
3103                                    struct scic_sds_remote_device *sci_dev,
3104                                    u16 io_tag,
3105                                    struct scic_sds_request *sci_req)
3106 {
3107         sci_init_sm(&sci_req->sm, scic_sds_request_state_table, SCI_REQ_INIT);
3108
3109         sci_req->io_tag = io_tag;
3110         sci_req->owning_controller = scic;
3111         sci_req->target_device = sci_dev;
3112         sci_req->protocol = SCIC_NO_PROTOCOL;
3113         sci_req->saved_rx_frame_index = SCU_INVALID_FRAME_INDEX;
3114         sci_req->device_sequence = scic_sds_remote_device_get_sequence(sci_dev);
3115
3116         sci_req->sci_status   = SCI_SUCCESS;
3117         sci_req->scu_status   = 0;
3118         sci_req->post_context = 0xFFFFFFFF;
3119
3120         sci_req->is_task_management_request = false;
3121
3122         if (io_tag == SCI_CONTROLLER_INVALID_IO_TAG) {
3123                 sci_req->was_tag_assigned_by_user = false;
3124                 sci_req->task_context_buffer = &sci_req->tc;
3125         } else {
3126                 sci_req->was_tag_assigned_by_user = true;
3127
3128                 sci_req->task_context_buffer =
3129                         scic_sds_controller_get_task_context_buffer(scic, io_tag);
3130         }
3131 }
3132
3133 static enum sci_status
3134 scic_io_request_construct(struct scic_sds_controller *scic,
3135                           struct scic_sds_remote_device *sci_dev,
3136                           u16 io_tag, struct scic_sds_request *sci_req)
3137 {
3138         struct domain_device *dev = sci_dev_to_domain(sci_dev);
3139         enum sci_status status = SCI_SUCCESS;
3140
3141         /* Build the common part of the request */
3142         scic_sds_general_request_construct(scic, sci_dev, io_tag, sci_req);
3143
3144         if (sci_dev->rnc.remote_node_index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX)
3145                 return SCI_FAILURE_INVALID_REMOTE_DEVICE;
3146
3147         if (dev->dev_type == SAS_END_DEV)
3148                 /* pass */;
3149         else if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP))
3150                 memset(&sci_req->stp.cmd, 0, sizeof(sci_req->stp.cmd));
3151         else if (dev_is_expander(dev))
3152                 memset(&sci_req->smp.cmd, 0, sizeof(sci_req->smp.cmd));
3153         else
3154                 return SCI_FAILURE_UNSUPPORTED_PROTOCOL;
3155
3156         memset(sci_req->task_context_buffer, 0,
3157                offsetof(struct scu_task_context, sgl_pair_ab));
3158
3159         return status;
3160 }
3161
3162 enum sci_status scic_task_request_construct(struct scic_sds_controller *scic,
3163                                             struct scic_sds_remote_device *sci_dev,
3164                                             u16 io_tag, struct scic_sds_request *sci_req)
3165 {
3166         struct domain_device *dev = sci_dev_to_domain(sci_dev);
3167         enum sci_status status = SCI_SUCCESS;
3168
3169         /* Build the common part of the request */
3170         scic_sds_general_request_construct(scic, sci_dev, io_tag, sci_req);
3171
3172         if (dev->dev_type == SAS_END_DEV ||
3173             dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
3174                 sci_req->is_task_management_request = true;
3175                 memset(sci_req->task_context_buffer, 0, sizeof(struct scu_task_context));
3176         } else
3177                 status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;
3178
3179         return status;
3180 }
3181
3182 static enum sci_status isci_request_ssp_request_construct(
3183         struct isci_request *request)
3184 {
3185         enum sci_status status;
3186
3187         dev_dbg(&request->isci_host->pdev->dev,
3188                 "%s: request = %p\n",
3189                 __func__,
3190                 request);
3191         status = scic_io_request_construct_basic_ssp(&request->sci);
3192         return status;
3193 }
3194
3195 static enum sci_status isci_request_stp_request_construct(
3196         struct isci_request *request)
3197 {
3198         struct sas_task *task = isci_request_access_task(request);
3199         enum sci_status status;
3200         struct host_to_dev_fis *register_fis;
3201
3202         dev_dbg(&request->isci_host->pdev->dev,
3203                 "%s: request = %p\n",
3204                 __func__,
3205                 request);
3206
3207         /* Get the host_to_dev_fis from the core and copy
3208          * the fis from the task into it.
3209          */
3210         register_fis = isci_sata_task_to_fis_copy(task);
3211
3212         status = scic_io_request_construct_basic_sata(&request->sci);
3213
3214         /* Set the ncq tag in the fis, from the queue
3215          * command in the task.
3216          */
3217         if (isci_sata_is_task_ncq(task)) {
3218
3219                 isci_sata_set_ncq_tag(
3220                         register_fis,
3221                         task
3222                         );
3223         }
3224
3225         return status;
3226 }
3227
3228 /*
3229  * This function will fill in the SCU Task Context for a SMP request. The
3230  *    following important settings are utilized: -# task_type ==
3231  *    SCU_TASK_TYPE_SMP.  This simply indicates that a normal request type
3232  *    (i.e. non-raw frame) is being utilized to perform task management. -#
3233  *    control_frame == 1.  This ensures that the proper endianess is set so
3234  *    that the bytes are transmitted in the right order for a smp request frame.
3235  * @sci_req: This parameter specifies the smp request object being
3236  *    constructed.
3237  *
3238  */
3239 static void
3240 scu_smp_request_construct_task_context(struct scic_sds_request *sci_req,
3241                                        ssize_t req_len)
3242 {
3243         dma_addr_t dma_addr;
3244         struct scic_sds_remote_device *sci_dev;
3245         struct scic_sds_port *sci_port;
3246         struct scu_task_context *task_context;
3247         ssize_t word_cnt = sizeof(struct smp_req) / sizeof(u32);
3248
3249         /* byte swap the smp request. */
3250         sci_swab32_cpy(&sci_req->smp.cmd, &sci_req->smp.cmd,
3251                        word_cnt);
3252
3253         task_context = scic_sds_request_get_task_context(sci_req);
3254
3255         sci_dev = scic_sds_request_get_device(sci_req);
3256         sci_port = scic_sds_request_get_port(sci_req);
3257
3258         /*
3259          * Fill in the TC with the its required data
3260          * 00h
3261          */
3262         task_context->priority = 0;
3263         task_context->initiator_request = 1;
3264         task_context->connection_rate = sci_dev->connection_rate;
3265         task_context->protocol_engine_index =
3266                 scic_sds_controller_get_protocol_engine_group(scic);
3267         task_context->logical_port_index = scic_sds_port_get_index(sci_port);
3268         task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SMP;
3269         task_context->abort = 0;
3270         task_context->valid = SCU_TASK_CONTEXT_VALID;
3271         task_context->context_type = SCU_TASK_CONTEXT_TYPE;
3272
3273         /* 04h */
3274         task_context->remote_node_index = sci_dev->rnc.remote_node_index;
3275         task_context->command_code = 0;
3276         task_context->task_type = SCU_TASK_TYPE_SMP_REQUEST;
3277
3278         /* 08h */
3279         task_context->link_layer_control = 0;
3280         task_context->do_not_dma_ssp_good_response = 1;
3281         task_context->strict_ordering = 0;
3282         task_context->control_frame = 1;
3283         task_context->timeout_enable = 0;
3284         task_context->block_guard_enable = 0;
3285
3286         /* 0ch */
3287         task_context->address_modifier = 0;
3288
3289         /* 10h */
3290         task_context->ssp_command_iu_length = req_len;
3291
3292         /* 14h */
3293         task_context->transfer_length_bytes = 0;
3294
3295         /*
3296          * 18h ~ 30h, protocol specific
3297          * since commandIU has been build by framework at this point, we just
3298          * copy the frist DWord from command IU to this location. */
3299         memcpy(&task_context->type.smp, &sci_req->smp.cmd, sizeof(u32));
3300
3301         /*
3302          * 40h
3303          * "For SMP you could program it to zero. We would prefer that way
3304          * so that done code will be consistent." - Venki
3305          */
3306         task_context->task_phase = 0;
3307
3308         if (sci_req->was_tag_assigned_by_user) {
3309                 /*
3310                  * Build the task context now since we have already read
3311                  * the data
3312                  */
3313                 sci_req->post_context =
3314                         (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
3315                          (scic_sds_controller_get_protocol_engine_group(scic) <<
3316                           SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
3317                          (scic_sds_port_get_index(sci_port) <<
3318                           SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
3319                          scic_sds_io_tag_get_index(sci_req->io_tag));
3320         } else {
3321                 /*
3322                  * Build the task context now since we have already read
3323                  * the data.
3324                  * I/O tag index is not assigned because we have to wait
3325                  * until we get a TCi.
3326                  */
3327                 sci_req->post_context =
3328                         (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
3329                          (scic_sds_controller_get_protocol_engine_group(scic) <<
3330                           SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
3331                          (scic_sds_port_get_index(sci_port) <<
3332                           SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT));
3333         }
3334
3335         /*
3336          * Copy the physical address for the command buffer to the SCU Task
3337          * Context command buffer should not contain command header.
3338          */
3339         dma_addr = scic_io_request_get_dma_addr(sci_req,
3340                                                 ((char *) &sci_req->smp.cmd) +
3341                                                 sizeof(u32));
3342
3343         task_context->command_iu_upper = upper_32_bits(dma_addr);
3344         task_context->command_iu_lower = lower_32_bits(dma_addr);
3345
3346         /* SMP response comes as UF, so no need to set response IU address. */
3347         task_context->response_iu_upper = 0;
3348         task_context->response_iu_lower = 0;
3349 }
3350
3351 static enum sci_status
3352 scic_io_request_construct_smp(struct scic_sds_request *sci_req)
3353 {
3354         struct smp_req *smp_req = &sci_req->smp.cmd;
3355
3356         sci_req->protocol = SCIC_SMP_PROTOCOL;
3357
3358         /*
3359          * Look at the SMP requests' header fields; for certain SAS 1.x SMP
3360          * functions under SAS 2.0, a zero request length really indicates
3361          * a non-zero default length.
3362          */
3363         if (smp_req->req_len == 0) {
3364                 switch (smp_req->func) {
3365                 case SMP_DISCOVER:
3366                 case SMP_REPORT_PHY_ERR_LOG:
3367                 case SMP_REPORT_PHY_SATA:
3368                 case SMP_REPORT_ROUTE_INFO:
3369                         smp_req->req_len = 2;
3370                         break;
3371                 case SMP_CONF_ROUTE_INFO:
3372                 case SMP_PHY_CONTROL:
3373                 case SMP_PHY_TEST_FUNCTION:
3374                         smp_req->req_len = 9;
3375                         break;
3376                         /* Default - zero is a valid default for 2.0. */
3377                 }
3378         }
3379
3380         scu_smp_request_construct_task_context(sci_req, smp_req->req_len);
3381
3382         sci_change_state(&sci_req->sm, SCI_REQ_CONSTRUCTED);
3383
3384         return SCI_SUCCESS;
3385 }
3386
3387 /*
3388  * isci_smp_request_build() - This function builds the smp request.
3389  * @ireq: This parameter points to the isci_request allocated in the
3390  *    request construct function.
3391  *
3392  * SCI_SUCCESS on successfull completion, or specific failure code.
3393  */
3394 static enum sci_status isci_smp_request_build(struct isci_request *ireq)
3395 {
3396         enum sci_status status = SCI_FAILURE;
3397         struct sas_task *task = isci_request_access_task(ireq);
3398         struct scic_sds_request *sci_req = &ireq->sci;
3399
3400         dev_dbg(&ireq->isci_host->pdev->dev,
3401                 "%s: request = %p\n", __func__, ireq);
3402
3403         dev_dbg(&ireq->isci_host->pdev->dev,
3404                 "%s: smp_req len = %d\n",
3405                 __func__,
3406                 task->smp_task.smp_req.length);
3407
3408         /* copy the smp_command to the address; */
3409         sg_copy_to_buffer(&task->smp_task.smp_req, 1,
3410                           &sci_req->smp.cmd,
3411                           sizeof(struct smp_req));
3412
3413         status = scic_io_request_construct_smp(sci_req);
3414         if (status != SCI_SUCCESS)
3415                 dev_warn(&ireq->isci_host->pdev->dev,
3416                          "%s: failed with status = %d\n",
3417                          __func__,
3418                          status);
3419
3420         return status;
3421 }
3422
3423 /**
3424  * isci_io_request_build() - This function builds the io request object.
3425  * @isci_host: This parameter specifies the ISCI host object
3426  * @request: This parameter points to the isci_request object allocated in the
3427  *    request construct function.
3428  * @sci_device: This parameter is the handle for the sci core's remote device
3429  *    object that is the destination for this request.
3430  *
3431  * SCI_SUCCESS on successfull completion, or specific failure code.
3432  */
3433 static enum sci_status isci_io_request_build(
3434         struct isci_host *isci_host,
3435         struct isci_request *request,
3436         struct isci_remote_device *isci_device)
3437 {
3438         enum sci_status status = SCI_SUCCESS;
3439         struct sas_task *task = isci_request_access_task(request);
3440         struct scic_sds_remote_device *sci_device = &isci_device->sci;
3441
3442         dev_dbg(&isci_host->pdev->dev,
3443                 "%s: isci_device = 0x%p; request = %p, "
3444                 "num_scatter = %d\n",
3445                 __func__,
3446                 isci_device,
3447                 request,
3448                 task->num_scatter);
3449
3450         /* map the sgl addresses, if present.
3451          * libata does the mapping for sata devices
3452          * before we get the request.
3453          */
3454         if (task->num_scatter &&
3455             !sas_protocol_ata(task->task_proto) &&
3456             !(SAS_PROTOCOL_SMP & task->task_proto)) {
3457
3458                 request->num_sg_entries = dma_map_sg(
3459                         &isci_host->pdev->dev,
3460                         task->scatter,
3461                         task->num_scatter,
3462                         task->data_dir
3463                         );
3464
3465                 if (request->num_sg_entries == 0)
3466                         return SCI_FAILURE_INSUFFICIENT_RESOURCES;
3467         }
3468
3469         /* build the common request object. For now,
3470          * we will let the core allocate the IO tag.
3471          */
3472         status = scic_io_request_construct(&isci_host->sci, sci_device,
3473                                            SCI_CONTROLLER_INVALID_IO_TAG,
3474                                            &request->sci);
3475
3476         if (status != SCI_SUCCESS) {
3477                 dev_warn(&isci_host->pdev->dev,
3478                          "%s: failed request construct\n",
3479                          __func__);
3480                 return SCI_FAILURE;
3481         }
3482
3483         switch (task->task_proto) {
3484         case SAS_PROTOCOL_SMP:
3485                 status = isci_smp_request_build(request);
3486                 break;
3487         case SAS_PROTOCOL_SSP:
3488                 status = isci_request_ssp_request_construct(request);
3489                 break;
3490         case SAS_PROTOCOL_SATA:
3491         case SAS_PROTOCOL_STP:
3492         case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP:
3493                 status = isci_request_stp_request_construct(request);
3494                 break;
3495         default:
3496                 dev_warn(&isci_host->pdev->dev,
3497                          "%s: unknown protocol\n", __func__);
3498                 return SCI_FAILURE;
3499         }
3500
3501         return SCI_SUCCESS;
3502 }
3503
3504 /**
3505  * isci_request_alloc_core() - This function gets the request object from the
3506  *    isci_host dma cache.
3507  * @isci_host: This parameter specifies the ISCI host object
3508  * @isci_request: This parameter will contain the pointer to the new
3509  *    isci_request object.
3510  * @isci_device: This parameter is the pointer to the isci remote device object
3511  *    that is the destination for this request.
3512  * @gfp_flags: This parameter specifies the os allocation flags.
3513  *
3514  * SCI_SUCCESS on successfull completion, or specific failure code.
3515  */
3516 static int isci_request_alloc_core(
3517         struct isci_host *isci_host,
3518         struct isci_request **isci_request,
3519         struct isci_remote_device *isci_device,
3520         gfp_t gfp_flags)
3521 {
3522         int ret = 0;
3523         dma_addr_t handle;
3524         struct isci_request *request;
3525
3526
3527         /* get pointer to dma memory. This actually points
3528          * to both the isci_remote_device object and the
3529          * sci object. The isci object is at the beginning
3530          * of the memory allocated here.
3531          */
3532         request = dma_pool_alloc(isci_host->dma_pool, gfp_flags, &handle);
3533         if (!request) {
3534                 dev_warn(&isci_host->pdev->dev,
3535                          "%s: dma_pool_alloc returned NULL\n", __func__);
3536                 return -ENOMEM;
3537         }
3538
3539         /* initialize the request object.       */
3540         spin_lock_init(&request->state_lock);
3541         request->request_daddr = handle;
3542         request->isci_host = isci_host;
3543         request->isci_device = isci_device;
3544         request->io_request_completion = NULL;
3545         request->terminated = false;
3546
3547         request->num_sg_entries = 0;
3548
3549         request->complete_in_target = false;
3550
3551         INIT_LIST_HEAD(&request->completed_node);
3552         INIT_LIST_HEAD(&request->dev_node);
3553
3554         *isci_request = request;
3555         isci_request_change_state(request, allocated);
3556
3557         return ret;
3558 }
3559
3560 static int isci_request_alloc_io(
3561         struct isci_host *isci_host,
3562         struct sas_task *task,
3563         struct isci_request **isci_request,
3564         struct isci_remote_device *isci_device,
3565         gfp_t gfp_flags)
3566 {
3567         int retval = isci_request_alloc_core(isci_host, isci_request,
3568                                              isci_device, gfp_flags);
3569
3570         if (!retval) {
3571                 (*isci_request)->ttype_ptr.io_task_ptr = task;
3572                 (*isci_request)->ttype                 = io_task;
3573
3574                 task->lldd_task = *isci_request;
3575         }
3576         return retval;
3577 }
3578
3579 /**
3580  * isci_request_alloc_tmf() - This function gets the request object from the
3581  *    isci_host dma cache and initializes the relevant fields as a sas_task.
3582  * @isci_host: This parameter specifies the ISCI host object
3583  * @sas_task: This parameter is the task struct from the upper layer driver.
3584  * @isci_request: This parameter will contain the pointer to the new
3585  *    isci_request object.
3586  * @isci_device: This parameter is the pointer to the isci remote device object
3587  *    that is the destination for this request.
3588  * @gfp_flags: This parameter specifies the os allocation flags.
3589  *
3590  * SCI_SUCCESS on successfull completion, or specific failure code.
3591  */
3592 int isci_request_alloc_tmf(
3593         struct isci_host *isci_host,
3594         struct isci_tmf *isci_tmf,
3595         struct isci_request **isci_request,
3596         struct isci_remote_device *isci_device,
3597         gfp_t gfp_flags)
3598 {
3599         int retval = isci_request_alloc_core(isci_host, isci_request,
3600                                              isci_device, gfp_flags);
3601
3602         if (!retval) {
3603
3604                 (*isci_request)->ttype_ptr.tmf_task_ptr = isci_tmf;
3605                 (*isci_request)->ttype = tmf_task;
3606         }
3607         return retval;
3608 }
3609
3610 /**
3611  * isci_request_execute() - This function allocates the isci_request object,
3612  *    all fills in some common fields.
3613  * @isci_host: This parameter specifies the ISCI host object
3614  * @sas_task: This parameter is the task struct from the upper layer driver.
3615  * @isci_request: This parameter will contain the pointer to the new
3616  *    isci_request object.
3617  * @gfp_flags: This parameter specifies the os allocation flags.
3618  *
3619  * SCI_SUCCESS on successfull completion, or specific failure code.
3620  */
3621 int isci_request_execute(
3622         struct isci_host *isci_host,
3623         struct sas_task *task,
3624         struct isci_request **isci_request,
3625         gfp_t gfp_flags)
3626 {
3627         int ret = 0;
3628         struct scic_sds_remote_device *sci_device;
3629         enum sci_status status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;
3630         struct isci_remote_device *isci_device;
3631         struct isci_request *request;
3632         unsigned long flags;
3633
3634         isci_device = task->dev->lldd_dev;
3635         sci_device = &isci_device->sci;
3636
3637         /* do common allocation and init of request object. */
3638         ret = isci_request_alloc_io(
3639                 isci_host,
3640                 task,
3641                 &request,
3642                 isci_device,
3643                 gfp_flags
3644                 );
3645
3646         if (ret)
3647                 goto out;
3648
3649         status = isci_io_request_build(isci_host, request, isci_device);
3650         if (status != SCI_SUCCESS) {
3651                 dev_warn(&isci_host->pdev->dev,
3652                          "%s: request_construct failed - status = 0x%x\n",
3653                          __func__,
3654                          status);
3655                 goto out;
3656         }
3657
3658         spin_lock_irqsave(&isci_host->scic_lock, flags);
3659
3660         /* send the request, let the core assign the IO TAG.    */
3661         status = scic_controller_start_io(&isci_host->sci, sci_device,
3662                                           &request->sci,
3663                                           SCI_CONTROLLER_INVALID_IO_TAG);
3664         if (status != SCI_SUCCESS &&
3665             status != SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
3666                 dev_warn(&isci_host->pdev->dev,
3667                          "%s: failed request start (0x%x)\n",
3668                          __func__, status);
3669                 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
3670                 goto out;
3671         }
3672
3673         /* Either I/O started OK, or the core has signaled that
3674          * the device needs a target reset.
3675          *
3676          * In either case, hold onto the I/O for later.
3677          *
3678          * Update it's status and add it to the list in the
3679          * remote device object.
3680          */
3681         isci_request_change_state(request, started);
3682         list_add(&request->dev_node, &isci_device->reqs_in_process);
3683
3684         if (status == SCI_SUCCESS) {
3685                 /* Save the tag for possible task mgmt later. */
3686                 request->io_tag = request->sci.io_tag;
3687         } else {
3688                 /* The request did not really start in the
3689                  * hardware, so clear the request handle
3690                  * here so no terminations will be done.
3691                  */
3692                 request->terminated = true;
3693         }
3694         spin_unlock_irqrestore(&isci_host->scic_lock, flags);
3695
3696         if (status ==
3697             SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
3698                 /* Signal libsas that we need the SCSI error
3699                 * handler thread to work on this I/O and that
3700                 * we want a device reset.
3701                 */
3702                 spin_lock_irqsave(&task->task_state_lock, flags);
3703                 task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
3704                 spin_unlock_irqrestore(&task->task_state_lock, flags);
3705
3706                 /* Cause this task to be scheduled in the SCSI error
3707                 * handler thread.
3708                 */
3709                 isci_execpath_callback(isci_host, task,
3710                                        sas_task_abort);
3711
3712                 /* Change the status, since we are holding
3713                 * the I/O until it is managed by the SCSI
3714                 * error handler.
3715                 */
3716                 status = SCI_SUCCESS;
3717         }
3718
3719  out:
3720         if (status != SCI_SUCCESS) {
3721                 /* release dma memory on failure. */
3722                 isci_request_free(isci_host, request);
3723                 request = NULL;
3724                 ret = SCI_FAILURE;
3725         }
3726
3727         *isci_request = request;
3728         return ret;
3729 }