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[SCSI] aic7xxx: make correct use of slave_alloc/destroy and remove the per device...
[linux-3.10.git] / drivers / scsi / aic7xxx / aic7xxx_osm.c
1 /*
2  * Adaptec AIC7xxx device driver for Linux.
3  *
4  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
5  *
6  * Copyright (c) 1994 John Aycock
7  *   The University of Calgary Department of Computer Science.
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2, or (at your option)
12  * any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; see the file COPYING.  If not, write to
21  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
22  *
23  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
24  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
25  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
26  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
27  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
28  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
29  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
30  * ANSI SCSI-2 specification (draft 10c), ...
31  *
32  * --------------------------------------------------------------------------
33  *
34  *  Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
35  *
36  *  Substantially modified to include support for wide and twin bus
37  *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
38  *  SCB paging, and other rework of the code.
39  *
40  * --------------------------------------------------------------------------
41  * Copyright (c) 1994-2000 Justin T. Gibbs.
42  * Copyright (c) 2000-2001 Adaptec Inc.
43  * All rights reserved.
44  *
45  * Redistribution and use in source and binary forms, with or without
46  * modification, are permitted provided that the following conditions
47  * are met:
48  * 1. Redistributions of source code must retain the above copyright
49  *    notice, this list of conditions, and the following disclaimer,
50  *    without modification.
51  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
52  *    substantially similar to the "NO WARRANTY" disclaimer below
53  *    ("Disclaimer") and any redistribution must be conditioned upon
54  *    including a substantially similar Disclaimer requirement for further
55  *    binary redistribution.
56  * 3. Neither the names of the above-listed copyright holders nor the names
57  *    of any contributors may be used to endorse or promote products derived
58  *    from this software without specific prior written permission.
59  *
60  * Alternatively, this software may be distributed under the terms of the
61  * GNU General Public License ("GPL") version 2 as published by the Free
62  * Software Foundation.
63  *
64  * NO WARRANTY
65  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
66  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
67  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
68  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
69  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
70  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
71  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
72  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
73  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
74  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
75  * POSSIBILITY OF SUCH DAMAGES.
76  *
77  *---------------------------------------------------------------------------
78  *
79  *  Thanks also go to (in alphabetical order) the following:
80  *
81  *    Rory Bolt     - Sequencer bug fixes
82  *    Jay Estabrook - Initial DEC Alpha support
83  *    Doug Ledford  - Much needed abort/reset bug fixes
84  *    Kai Makisara  - DMAing of SCBs
85  *
86  *  A Boot time option was also added for not resetting the scsi bus.
87  *
88  *    Form:  aic7xxx=extended
89  *           aic7xxx=no_reset
90  *           aic7xxx=verbose
91  *
92  *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
93  *
94  *  Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
95  */
96
97 /*
98  * Further driver modifications made by Doug Ledford <dledford@redhat.com>
99  *
100  * Copyright (c) 1997-1999 Doug Ledford
101  *
102  * These changes are released under the same licensing terms as the FreeBSD
103  * driver written by Justin Gibbs.  Please see his Copyright notice above
104  * for the exact terms and conditions covering my changes as well as the
105  * warranty statement.
106  *
107  * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
108  * but are not limited to:
109  *
110  *  1: Import of the latest FreeBSD sequencer code for this driver
111  *  2: Modification of kernel code to accommodate different sequencer semantics
112  *  3: Extensive changes throughout kernel portion of driver to improve
113  *     abort/reset processing and error hanndling
114  *  4: Other work contributed by various people on the Internet
115  *  5: Changes to printk information and verbosity selection code
116  *  6: General reliability related changes, especially in IRQ management
117  *  7: Modifications to the default probe/attach order for supported cards
118  *  8: SMP friendliness has been improved
119  *
120  */
121
122 #include "aic7xxx_osm.h"
123 #include "aic7xxx_inline.h"
124 #include <scsi/scsicam.h>
125 #include <scsi/scsi_transport.h>
126 #include <scsi/scsi_transport_spi.h>
127
128 static struct scsi_transport_template *ahc_linux_transport_template = NULL;
129
130 /*
131  * Include aiclib.c as part of our
132  * "module dependencies are hard" work around.
133  */
134 #include "aiclib.c"
135
136 #include <linux/init.h>         /* __setup */
137 #include <linux/mm.h>           /* For fetching system memory size */
138 #include <linux/blkdev.h>               /* For block_size() */
139 #include <linux/delay.h>        /* For ssleep/msleep */
140
141 /*
142  * Lock protecting manipulation of the ahc softc list.
143  */
144 spinlock_t ahc_list_spinlock;
145
146 /*
147  * Set this to the delay in seconds after SCSI bus reset.
148  * Note, we honor this only for the initial bus reset.
149  * The scsi error recovery code performs its own bus settle
150  * delay handling for error recovery actions.
151  */
152 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
153 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
154 #else
155 #define AIC7XXX_RESET_DELAY 5000
156 #endif
157
158 /*
159  * Control collection of SCSI transfer statistics for the /proc filesystem.
160  *
161  * NOTE: Do NOT enable this when running on kernels version 1.2.x and below.
162  * NOTE: This does affect performance since it has to maintain statistics.
163  */
164 #ifdef CONFIG_AIC7XXX_PROC_STATS
165 #define AIC7XXX_PROC_STATS
166 #endif
167
168 /*
169  * To change the default number of tagged transactions allowed per-device,
170  * add a line to the lilo.conf file like:
171  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
172  * which will result in the first four devices on the first two
173  * controllers being set to a tagged queue depth of 32.
174  *
175  * The tag_commands is an array of 16 to allow for wide and twin adapters.
176  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
177  * for channel 1.
178  */
179 typedef struct {
180         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
181 } adapter_tag_info_t;
182
183 /*
184  * Modify this as you see fit for your system.
185  *
186  * 0                    tagged queuing disabled
187  * 1 <= n <= 253        n == max tags ever dispatched.
188  *
189  * The driver will throttle the number of commands dispatched to a
190  * device if it returns queue full.  For devices with a fixed maximum
191  * queue depth, the driver will eventually determine this depth and
192  * lock it in (a console message is printed to indicate that a lock
193  * has occurred).  On some devices, queue full is returned for a temporary
194  * resource shortage.  These devices will return queue full at varying
195  * depths.  The driver will throttle back when the queue fulls occur and
196  * attempt to slowly increase the depth over time as the device recovers
197  * from the resource shortage.
198  *
199  * In this example, the first line will disable tagged queueing for all
200  * the devices on the first probed aic7xxx adapter.
201  *
202  * The second line enables tagged queueing with 4 commands/LUN for IDs
203  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
204  * driver to attempt to use up to 64 tags for ID 1.
205  *
206  * The third line is the same as the first line.
207  *
208  * The fourth line disables tagged queueing for devices 0 and 3.  It
209  * enables tagged queueing for the other IDs, with 16 commands/LUN
210  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
211  * IDs 2, 5-7, and 9-15.
212  */
213
214 /*
215  * NOTE: The below structure is for reference only, the actual structure
216  *       to modify in order to change things is just below this comment block.
217 adapter_tag_info_t aic7xxx_tag_info[] =
218 {
219         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
220         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
221         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
222         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
223 };
224 */
225
226 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
227 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
228 #else
229 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
230 #endif
231
232 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
233         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
234         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
235         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
236         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
237         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
238         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
239         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
240         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE                \
241 }
242
243 /*
244  * By default, use the number of commands specified by
245  * the users kernel configuration.
246  */
247 static adapter_tag_info_t aic7xxx_tag_info[] =
248 {
249         {AIC7XXX_CONFIGED_TAG_COMMANDS},
250         {AIC7XXX_CONFIGED_TAG_COMMANDS},
251         {AIC7XXX_CONFIGED_TAG_COMMANDS},
252         {AIC7XXX_CONFIGED_TAG_COMMANDS},
253         {AIC7XXX_CONFIGED_TAG_COMMANDS},
254         {AIC7XXX_CONFIGED_TAG_COMMANDS},
255         {AIC7XXX_CONFIGED_TAG_COMMANDS},
256         {AIC7XXX_CONFIGED_TAG_COMMANDS},
257         {AIC7XXX_CONFIGED_TAG_COMMANDS},
258         {AIC7XXX_CONFIGED_TAG_COMMANDS},
259         {AIC7XXX_CONFIGED_TAG_COMMANDS},
260         {AIC7XXX_CONFIGED_TAG_COMMANDS},
261         {AIC7XXX_CONFIGED_TAG_COMMANDS},
262         {AIC7XXX_CONFIGED_TAG_COMMANDS},
263         {AIC7XXX_CONFIGED_TAG_COMMANDS},
264         {AIC7XXX_CONFIGED_TAG_COMMANDS}
265 };
266
267 /*
268  * There should be a specific return value for this in scsi.h, but
269  * it seems that most drivers ignore it.
270  */
271 #define DID_UNDERFLOW   DID_ERROR
272
273 void
274 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
275 {
276         printk("(scsi%d:%c:%d:%d): ",
277                ahc->platform_data->host->host_no,
278                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
279                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
280                scb != NULL ? SCB_GET_LUN(scb) : -1);
281 }
282
283 /*
284  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
285  *       cards in the system.  This should be fixed.  Exceptions to this
286  *       rule are noted in the comments.
287  */
288
289 /*
290  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
291  * has no effect on any later resets that might occur due to things like
292  * SCSI bus timeouts.
293  */
294 static uint32_t aic7xxx_no_reset;
295
296 /*
297  * Certain PCI motherboards will scan PCI devices from highest to lowest,
298  * others scan from lowest to highest, and they tend to do all kinds of
299  * strange things when they come into contact with PCI bridge chips.  The
300  * net result of all this is that the PCI card that is actually used to boot
301  * the machine is very hard to detect.  Most motherboards go from lowest
302  * PCI slot number to highest, and the first SCSI controller found is the
303  * one you boot from.  The only exceptions to this are when a controller
304  * has its BIOS disabled.  So, we by default sort all of our SCSI controllers
305  * from lowest PCI slot number to highest PCI slot number.  We also force
306  * all controllers with their BIOS disabled to the end of the list.  This
307  * works on *almost* all computers.  Where it doesn't work, we have this
308  * option.  Setting this option to non-0 will reverse the order of the sort
309  * to highest first, then lowest, but will still leave cards with their BIOS
310  * disabled at the very end.  That should fix everyone up unless there are
311  * really strange cirumstances.
312  */
313 static uint32_t aic7xxx_reverse_scan;
314
315 /*
316  * Should we force EXTENDED translation on a controller.
317  *     0 == Use whatever is in the SEEPROM or default to off
318  *     1 == Use whatever is in the SEEPROM or default to on
319  */
320 static uint32_t aic7xxx_extended;
321
322 /*
323  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
324  * dubious at best.  To my knowledge, this option has never actually
325  * solved a PCI parity problem, but on certain machines with broken PCI
326  * chipset configurations where stray PCI transactions with bad parity are
327  * the norm rather than the exception, the error messages can be overwelming.
328  * It's included in the driver for completeness.
329  *   0     = Shut off PCI parity check
330  *   non-0 = reverse polarity pci parity checking
331  */
332 static uint32_t aic7xxx_pci_parity = ~0;
333
334 /*
335  * Certain newer motherboards have put new PCI based devices into the
336  * IO spaces that used to typically be occupied by VLB or EISA cards.
337  * This overlap can cause these newer motherboards to lock up when scanned
338  * for older EISA and VLB devices.  Setting this option to non-0 will
339  * cause the driver to skip scanning for any VLB or EISA controllers and
340  * only support the PCI controllers.  NOTE: this means that if the kernel
341  * os compiled with PCI support disabled, then setting this to non-0
342  * would result in never finding any devices :)
343  */
344 #ifndef CONFIG_AIC7XXX_PROBE_EISA_VL
345 uint32_t aic7xxx_probe_eisa_vl;
346 #else
347 uint32_t aic7xxx_probe_eisa_vl = ~0;
348 #endif
349
350 /*
351  * There are lots of broken chipsets in the world.  Some of them will
352  * violate the PCI spec when we issue byte sized memory writes to our
353  * controller.  I/O mapped register access, if allowed by the given
354  * platform, will work in almost all cases.
355  */
356 uint32_t aic7xxx_allow_memio = ~0;
357
358 /*
359  * aic7xxx_detect() has been run, so register all device arrivals
360  * immediately with the system rather than deferring to the sorted
361  * attachment performed by aic7xxx_detect().
362  */
363 int aic7xxx_detect_complete;
364
365 /*
366  * So that we can set how long each device is given as a selection timeout.
367  * The table of values goes like this:
368  *   0 - 256ms
369  *   1 - 128ms
370  *   2 - 64ms
371  *   3 - 32ms
372  * We default to 256ms because some older devices need a longer time
373  * to respond to initial selection.
374  */
375 static uint32_t aic7xxx_seltime;
376
377 /*
378  * Certain devices do not perform any aging on commands.  Should the
379  * device be saturated by commands in one portion of the disk, it is
380  * possible for transactions on far away sectors to never be serviced.
381  * To handle these devices, we can periodically send an ordered tag to
382  * force all outstanding transactions to be serviced prior to a new
383  * transaction.
384  */
385 uint32_t aic7xxx_periodic_otag;
386
387 /*
388  * Module information and settable options.
389  */
390 static char *aic7xxx = NULL;
391
392 MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
393 MODULE_DESCRIPTION("Adaptec Aic77XX/78XX SCSI Host Bus Adapter driver");
394 MODULE_LICENSE("Dual BSD/GPL");
395 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
396 module_param(aic7xxx, charp, 0444);
397 MODULE_PARM_DESC(aic7xxx,
398 "period delimited, options string.\n"
399 "       verbose                 Enable verbose/diagnostic logging\n"
400 "       allow_memio             Allow device registers to be memory mapped\n"
401 "       debug                   Bitmask of debug values to enable\n"
402 "       no_probe                Toggle EISA/VLB controller probing\n"
403 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
404 "       no_reset                Supress initial bus resets\n"
405 "       extended                Enable extended geometry on all controllers\n"
406 "       periodic_otag           Send an ordered tagged transaction\n"
407 "                               periodically to prevent tag starvation.\n"
408 "                               This may be required by some older disk\n"
409 "                               drives or RAID arrays.\n"
410 "       reverse_scan            Sort PCI devices highest Bus/Slot to lowest\n"
411 "       tag_info:<tag_str>      Set per-target tag depth\n"
412 "       global_tag_depth:<int>  Global tag depth for every target\n"
413 "                               on every bus\n"
414 "       seltime:<int>           Selection Timeout\n"
415 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
416 "\n"
417 "       Sample /etc/modprobe.conf line:\n"
418 "               Toggle EISA/VLB probing\n"
419 "               Set tag depth on Controller 1/Target 1 to 10 tags\n"
420 "               Shorten the selection timeout to 128ms\n"
421 "\n"
422 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
423 );
424
425 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
426                                          struct ahc_linux_device *,
427                                          struct scb *);
428 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
429                                          struct scsi_cmnd *cmd);
430 static void ahc_linux_sem_timeout(u_long arg);
431 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
432 static void ahc_linux_release_simq(u_long arg);
433 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
434 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
435 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
436                                      struct ahc_devinfo *devinfo);
437 static void ahc_linux_device_queue_depth(struct ahc_softc *ahc,
438                                          struct ahc_linux_device *dev);
439 static struct ahc_linux_target* ahc_linux_alloc_target(struct ahc_softc*,
440                                                        u_int, u_int);
441 static void                     ahc_linux_free_target(struct ahc_softc*,
442                                                       struct ahc_linux_target*);
443 static struct ahc_linux_device* ahc_linux_alloc_device(struct ahc_softc*,
444                                                        struct ahc_linux_target*,
445                                                        u_int);
446 static void                     ahc_linux_free_device(struct ahc_softc*,
447                                                       struct ahc_linux_device*);
448 static int ahc_linux_run_command(struct ahc_softc*,
449                                  struct ahc_linux_device *,
450                                  struct scsi_cmnd *);
451 static void ahc_linux_setup_tag_info_global(char *p);
452 static aic_option_callback_t ahc_linux_setup_tag_info;
453 static int  aic7xxx_setup(char *s);
454 static int  ahc_linux_next_unit(void);
455
456 /********************************* Inlines ************************************/
457 static __inline struct ahc_linux_device*
458                      ahc_linux_get_device(struct ahc_softc *ahc, u_int channel,
459                                           u_int target, u_int lun);
460 static __inline void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
461
462 static __inline int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
463                                       struct ahc_dma_seg *sg,
464                                       dma_addr_t addr, bus_size_t len);
465
466 static __inline struct ahc_linux_device*
467 ahc_linux_get_device(struct ahc_softc *ahc, u_int channel, u_int target,
468                      u_int lun)
469 {
470         struct ahc_linux_target *targ;
471         struct ahc_linux_device *dev;
472         u_int target_offset;
473
474         target_offset = target;
475         if (channel != 0)
476                 target_offset += 8;
477         targ = ahc->platform_data->targets[target_offset];
478         BUG_ON(targ == NULL);
479         dev = targ->devices[lun];
480         return dev;
481 }
482
483 static __inline void
484 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
485 {
486         struct scsi_cmnd *cmd;
487
488         cmd = scb->io_ctx;
489         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
490         if (cmd->use_sg != 0) {
491                 struct scatterlist *sg;
492
493                 sg = (struct scatterlist *)cmd->request_buffer;
494                 pci_unmap_sg(ahc->dev_softc, sg, cmd->use_sg,
495                              cmd->sc_data_direction);
496         } else if (cmd->request_bufflen != 0) {
497                 pci_unmap_single(ahc->dev_softc,
498                                  scb->platform_data->buf_busaddr,
499                                  cmd->request_bufflen,
500                                  cmd->sc_data_direction);
501         }
502 }
503
504 static __inline int
505 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
506                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
507 {
508         int      consumed;
509
510         if ((scb->sg_count + 1) > AHC_NSEG)
511                 panic("Too few segs for dma mapping.  "
512                       "Increase AHC_NSEG\n");
513
514         consumed = 1;
515         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
516         scb->platform_data->xfer_len += len;
517
518         if (sizeof(dma_addr_t) > 4
519          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
520                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
521
522         sg->len = ahc_htole32(len);
523         return (consumed);
524 }
525
526 /*
527  * Try to detect an Adaptec 7XXX controller.
528  */
529 static int
530 ahc_linux_detect(struct scsi_host_template *template)
531 {
532         struct  ahc_softc *ahc;
533         int     found = 0;
534
535         /*
536          * Sanity checking of Linux SCSI data structures so
537          * that some of our hacks^H^H^H^H^Hassumptions aren't
538          * violated.
539          */
540         if (offsetof(struct ahc_cmd_internal, end)
541           > offsetof(struct scsi_cmnd, host_scribble)) {
542                 printf("ahc_linux_detect: SCSI data structures changed.\n");
543                 printf("ahc_linux_detect: Unable to attach\n");
544                 return (0);
545         }
546         /*
547          * If we've been passed any parameters, process them now.
548          */
549         if (aic7xxx)
550                 aic7xxx_setup(aic7xxx);
551
552         template->proc_name = "aic7xxx";
553
554         /*
555          * Initialize our softc list lock prior to
556          * probing for any adapters.
557          */
558         ahc_list_lockinit();
559
560         found = ahc_linux_pci_init();
561         if (!ahc_linux_eisa_init())
562                 found++;
563         
564         /*
565          * Register with the SCSI layer all
566          * controllers we've found.
567          */
568         TAILQ_FOREACH(ahc, &ahc_tailq, links) {
569
570                 if (ahc_linux_register_host(ahc, template) == 0)
571                         found++;
572         }
573
574         aic7xxx_detect_complete++;
575
576         return (found);
577 }
578
579 /*
580  * Return a string describing the driver.
581  */
582 static const char *
583 ahc_linux_info(struct Scsi_Host *host)
584 {
585         static char buffer[512];
586         char    ahc_info[256];
587         char   *bp;
588         struct ahc_softc *ahc;
589
590         bp = &buffer[0];
591         ahc = *(struct ahc_softc **)host->hostdata;
592         memset(bp, 0, sizeof(buffer));
593         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev ");
594         strcat(bp, AIC7XXX_DRIVER_VERSION);
595         strcat(bp, "\n");
596         strcat(bp, "        <");
597         strcat(bp, ahc->description);
598         strcat(bp, ">\n");
599         strcat(bp, "        ");
600         ahc_controller_info(ahc, ahc_info);
601         strcat(bp, ahc_info);
602         strcat(bp, "\n");
603
604         return (bp);
605 }
606
607 /*
608  * Queue an SCB to the controller.
609  */
610 static int
611 ahc_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
612 {
613         struct   ahc_softc *ahc;
614         struct   ahc_linux_device *dev;
615
616         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
617
618         /*
619          * Save the callback on completion function.
620          */
621         cmd->scsi_done = scsi_done;
622
623         /*
624          * Close the race of a command that was in the process of
625          * being queued to us just as our simq was frozen.  Let
626          * DV commands through so long as we are only frozen to
627          * perform DV.
628          */
629         if (ahc->platform_data->qfrozen != 0)
630                 return SCSI_MLQUEUE_HOST_BUSY;
631
632         dev = ahc_linux_get_device(ahc, cmd->device->channel, cmd->device->id,
633                                    cmd->device->lun);
634         BUG_ON(dev == NULL);
635
636         cmd->result = CAM_REQ_INPROG << 16;
637
638         return ahc_linux_run_command(ahc, dev, cmd);
639 }
640
641 static int
642 ahc_linux_slave_alloc(struct scsi_device *device)
643 {
644         struct  ahc_softc *ahc;
645         struct ahc_linux_target *targ;
646         struct scsi_target *starget = device->sdev_target;
647         struct ahc_linux_device *dev;
648         u_int target_offset;
649
650         target_offset = starget->id;
651         if (starget->channel != 0)
652                 target_offset += 8;
653
654         ahc = *((struct ahc_softc **)device->host->hostdata);
655         if (bootverbose)
656                 printf("%s: Slave Alloc %d\n", ahc_name(ahc), device->id);
657         targ = ahc->platform_data->targets[target_offset];
658         if (targ == NULL) {
659                 targ = ahc_linux_alloc_target(ahc, starget->channel, starget->id);
660                 struct seeprom_config *sc = ahc->seep_config;
661                 if (targ == NULL)
662                         return -ENOMEM;
663                 if (sc) {
664                         unsigned short scsirate;
665                         struct ahc_devinfo devinfo;
666                         struct ahc_initiator_tinfo *tinfo;
667                         struct ahc_tmode_tstate *tstate;
668                         char channel = starget->channel + 'A';
669                         unsigned int our_id = ahc->our_id;
670
671                         if (starget->channel)
672                                 our_id = ahc->our_id_b;
673
674                         if ((ahc->features & AHC_ULTRA2) != 0) {
675                                 scsirate = sc->device_flags[target_offset] & CFXFER;
676                         } else {
677                                 scsirate = (sc->device_flags[target_offset] & CFXFER) << 4;
678                                 if (sc->device_flags[target_offset] & CFSYNCH)
679                                         scsirate |= SOFS;
680                         }
681                         if (sc->device_flags[target_offset] & CFWIDEB) {
682                                 scsirate |= WIDEXFER;
683                                 spi_max_width(starget) = 1;
684                         } else
685                                 spi_max_width(starget) = 0;
686                         spi_min_period(starget) = 
687                                 ahc_find_period(ahc, scsirate, AHC_SYNCRATE_DT);
688                         tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
689                                                     targ->target, &tstate);
690                         ahc_compile_devinfo(&devinfo, our_id, targ->target,
691                                             CAM_LUN_WILDCARD, channel,
692                                             ROLE_INITIATOR);
693                         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
694                                          AHC_TRANS_GOAL, /*paused*/FALSE);
695                         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
696                                       AHC_TRANS_GOAL, /*paused*/FALSE);
697                 }
698                         
699         }
700         dev = targ->devices[device->lun];
701         if (dev == NULL) {
702                 dev = ahc_linux_alloc_device(ahc, targ, device->lun);
703                 if (dev == NULL)
704                         return -ENOMEM;
705         }
706
707         return 0;
708 }
709
710 static int
711 ahc_linux_slave_configure(struct scsi_device *device)
712 {
713         struct  ahc_softc *ahc;
714         struct  ahc_linux_device *dev;
715
716         ahc = *((struct ahc_softc **)device->host->hostdata);
717
718         if (bootverbose)
719                 printf("%s: Slave Configure %d\n", ahc_name(ahc), device->id);
720
721         dev = ahc_linux_get_device(ahc, device->channel, device->id,
722                                    device->lun);
723         dev->scsi_device = device;
724         ahc_linux_device_queue_depth(ahc, dev);
725
726         /* Initial Domain Validation */
727         if (!spi_initial_dv(device->sdev_target))
728                 spi_dv_device(device);
729
730         return 0;
731 }
732
733 static void
734 ahc_linux_slave_destroy(struct scsi_device *device)
735 {
736         struct  ahc_softc *ahc;
737         struct  ahc_linux_device *dev;
738
739         ahc = *((struct ahc_softc **)device->host->hostdata);
740         if (bootverbose)
741                 printf("%s: Slave Destroy %d\n", ahc_name(ahc), device->id);
742         dev = ahc_linux_get_device(ahc, device->channel,
743                                    device->id, device->lun);
744
745         BUG_ON(dev->active);
746
747         ahc_linux_free_device(ahc, dev);
748 }
749
750 #if defined(__i386__)
751 /*
752  * Return the disk geometry for the given SCSI device.
753  */
754 static int
755 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
756                     sector_t capacity, int geom[])
757 {
758         uint8_t *bh;
759         int      heads;
760         int      sectors;
761         int      cylinders;
762         int      ret;
763         int      extended;
764         struct   ahc_softc *ahc;
765         u_int    channel;
766
767         ahc = *((struct ahc_softc **)sdev->host->hostdata);
768         channel = sdev->channel;
769
770         bh = scsi_bios_ptable(bdev);
771         if (bh) {
772                 ret = scsi_partsize(bh, capacity,
773                                     &geom[2], &geom[0], &geom[1]);
774                 kfree(bh);
775                 if (ret != -1)
776                         return (ret);
777         }
778         heads = 64;
779         sectors = 32;
780         cylinders = aic_sector_div(capacity, heads, sectors);
781
782         if (aic7xxx_extended != 0)
783                 extended = 1;
784         else if (channel == 0)
785                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
786         else
787                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
788         if (extended && cylinders >= 1024) {
789                 heads = 255;
790                 sectors = 63;
791                 cylinders = aic_sector_div(capacity, heads, sectors);
792         }
793         geom[0] = heads;
794         geom[1] = sectors;
795         geom[2] = cylinders;
796         return (0);
797 }
798 #endif
799
800 /*
801  * Abort the current SCSI command(s).
802  */
803 static int
804 ahc_linux_abort(struct scsi_cmnd *cmd)
805 {
806         int error;
807
808         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
809         if (error != 0)
810                 printf("aic7xxx_abort returns 0x%x\n", error);
811         return (error);
812 }
813
814 /*
815  * Attempt to send a target reset message to the device that timed out.
816  */
817 static int
818 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
819 {
820         int error;
821
822         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
823         if (error != 0)
824                 printf("aic7xxx_dev_reset returns 0x%x\n", error);
825         return (error);
826 }
827
828 /*
829  * Reset the SCSI bus.
830  */
831 static int
832 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
833 {
834         struct ahc_softc *ahc;
835         int    found;
836
837         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
838         found = ahc_reset_channel(ahc, cmd->device->channel + 'A',
839                                   /*initiate reset*/TRUE);
840
841         if (bootverbose)
842                 printf("%s: SCSI bus reset delivered. "
843                        "%d SCBs aborted.\n", ahc_name(ahc), found);
844
845         return SUCCESS;
846 }
847
848 struct scsi_host_template aic7xxx_driver_template = {
849         .module                 = THIS_MODULE,
850         .name                   = "aic7xxx",
851         .proc_info              = ahc_linux_proc_info,
852         .info                   = ahc_linux_info,
853         .queuecommand           = ahc_linux_queue,
854         .eh_abort_handler       = ahc_linux_abort,
855         .eh_device_reset_handler = ahc_linux_dev_reset,
856         .eh_bus_reset_handler   = ahc_linux_bus_reset,
857 #if defined(__i386__)
858         .bios_param             = ahc_linux_biosparam,
859 #endif
860         .can_queue              = AHC_MAX_QUEUE,
861         .this_id                = -1,
862         .cmd_per_lun            = 2,
863         .use_clustering         = ENABLE_CLUSTERING,
864         .slave_alloc            = ahc_linux_slave_alloc,
865         .slave_configure        = ahc_linux_slave_configure,
866         .slave_destroy          = ahc_linux_slave_destroy,
867 };
868
869 /**************************** Tasklet Handler *********************************/
870
871 /******************************** Macros **************************************/
872 #define BUILD_SCSIID(ahc, cmd)                                              \
873         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
874         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
875         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
876
877 /******************************** Bus DMA *************************************/
878 int
879 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
880                    bus_size_t alignment, bus_size_t boundary,
881                    dma_addr_t lowaddr, dma_addr_t highaddr,
882                    bus_dma_filter_t *filter, void *filterarg,
883                    bus_size_t maxsize, int nsegments,
884                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
885 {
886         bus_dma_tag_t dmat;
887
888         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
889         if (dmat == NULL)
890                 return (ENOMEM);
891
892         /*
893          * Linux is very simplistic about DMA memory.  For now don't
894          * maintain all specification information.  Once Linux supplies
895          * better facilities for doing these operations, or the
896          * needs of this particular driver change, we might need to do
897          * more here.
898          */
899         dmat->alignment = alignment;
900         dmat->boundary = boundary;
901         dmat->maxsize = maxsize;
902         *ret_tag = dmat;
903         return (0);
904 }
905
906 void
907 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
908 {
909         free(dmat, M_DEVBUF);
910 }
911
912 int
913 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
914                  int flags, bus_dmamap_t *mapp)
915 {
916         *vaddr = pci_alloc_consistent(ahc->dev_softc,
917                                       dmat->maxsize, mapp);
918         if (*vaddr == NULL)
919                 return ENOMEM;
920         return 0;
921 }
922
923 void
924 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
925                 void* vaddr, bus_dmamap_t map)
926 {
927         pci_free_consistent(ahc->dev_softc, dmat->maxsize,
928                             vaddr, map);
929 }
930
931 int
932 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
933                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
934                 void *cb_arg, int flags)
935 {
936         /*
937          * Assume for now that this will only be used during
938          * initialization and not for per-transaction buffer mapping.
939          */
940         bus_dma_segment_t stack_sg;
941
942         stack_sg.ds_addr = map;
943         stack_sg.ds_len = dmat->maxsize;
944         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
945         return (0);
946 }
947
948 void
949 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
950 {
951 }
952
953 int
954 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
955 {
956         /* Nothing to do */
957         return (0);
958 }
959
960 /********************* Platform Dependent Functions ***************************/
961 /*
962  * Compare "left hand" softc with "right hand" softc, returning:
963  * < 0 - lahc has a lower priority than rahc
964  *   0 - Softcs are equal
965  * > 0 - lahc has a higher priority than rahc
966  */
967 int
968 ahc_softc_comp(struct ahc_softc *lahc, struct ahc_softc *rahc)
969 {
970         int     value;
971         int     rvalue;
972         int     lvalue;
973
974         /*
975          * Under Linux, cards are ordered as follows:
976          *      1) VLB/EISA BIOS enabled devices sorted by BIOS address.
977          *      2) PCI devices with BIOS enabled sorted by bus/slot/func.
978          *      3) All remaining VLB/EISA devices sorted by ioport.
979          *      4) All remaining PCI devices sorted by bus/slot/func.
980          */
981         value = (lahc->flags & AHC_BIOS_ENABLED)
982               - (rahc->flags & AHC_BIOS_ENABLED);
983         if (value != 0)
984                 /* Controllers with BIOS enabled have a *higher* priority */
985                 return (value);
986
987         /*
988          * Same BIOS setting, now sort based on bus type.
989          * EISA and VL controllers sort together.  EISA/VL
990          * have higher priority than PCI.
991          */
992         rvalue = (rahc->chip & AHC_BUS_MASK);
993         if (rvalue == AHC_VL)
994                 rvalue = AHC_EISA;
995         lvalue = (lahc->chip & AHC_BUS_MASK);
996         if (lvalue == AHC_VL)
997                 lvalue = AHC_EISA;
998         value = rvalue - lvalue;
999         if (value != 0)
1000                 return (value);
1001
1002         /* Still equal.  Sort by BIOS address, ioport, or bus/slot/func. */
1003         switch (rvalue) {
1004 #ifdef CONFIG_PCI
1005         case AHC_PCI:
1006         {
1007                 char primary_channel;
1008
1009                 if (aic7xxx_reverse_scan != 0)
1010                         value = ahc_get_pci_bus(lahc->dev_softc)
1011                               - ahc_get_pci_bus(rahc->dev_softc);
1012                 else
1013                         value = ahc_get_pci_bus(rahc->dev_softc)
1014                               - ahc_get_pci_bus(lahc->dev_softc);
1015                 if (value != 0)
1016                         break;
1017                 if (aic7xxx_reverse_scan != 0)
1018                         value = ahc_get_pci_slot(lahc->dev_softc)
1019                               - ahc_get_pci_slot(rahc->dev_softc);
1020                 else
1021                         value = ahc_get_pci_slot(rahc->dev_softc)
1022                               - ahc_get_pci_slot(lahc->dev_softc);
1023                 if (value != 0)
1024                         break;
1025                 /*
1026                  * On multi-function devices, the user can choose
1027                  * to have function 1 probed before function 0.
1028                  * Give whichever channel is the primary channel
1029                  * the highest priority.
1030                  */
1031                 primary_channel = (lahc->flags & AHC_PRIMARY_CHANNEL) + 'A';
1032                 value = -1;
1033                 if (lahc->channel == primary_channel)
1034                         value = 1;
1035                 break;
1036         }
1037 #endif
1038         case AHC_EISA:
1039                 if ((rahc->flags & AHC_BIOS_ENABLED) != 0) {
1040                         value = rahc->platform_data->bios_address
1041                               - lahc->platform_data->bios_address; 
1042                 } else {
1043                         value = rahc->bsh.ioport
1044                               - lahc->bsh.ioport; 
1045                 }
1046                 break;
1047         default:
1048                 panic("ahc_softc_sort: invalid bus type");
1049         }
1050         return (value);
1051 }
1052
1053 static void
1054 ahc_linux_setup_tag_info_global(char *p)
1055 {
1056         int tags, i, j;
1057
1058         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
1059         printf("Setting Global Tags= %d\n", tags);
1060
1061         for (i = 0; i < NUM_ELEMENTS(aic7xxx_tag_info); i++) {
1062                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
1063                         aic7xxx_tag_info[i].tag_commands[j] = tags;
1064                 }
1065         }
1066 }
1067
1068 static void
1069 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
1070 {
1071
1072         if ((instance >= 0) && (targ >= 0)
1073          && (instance < NUM_ELEMENTS(aic7xxx_tag_info))
1074          && (targ < AHC_NUM_TARGETS)) {
1075                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
1076                 if (bootverbose)
1077                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
1078         }
1079 }
1080
1081 /*
1082  * Handle Linux boot parameters. This routine allows for assigning a value
1083  * to a parameter with a ':' between the parameter and the value.
1084  * ie. aic7xxx=stpwlev:1,extended
1085  */
1086 static int
1087 aic7xxx_setup(char *s)
1088 {
1089         int     i, n;
1090         char   *p;
1091         char   *end;
1092
1093         static struct {
1094                 const char *name;
1095                 uint32_t *flag;
1096         } options[] = {
1097                 { "extended", &aic7xxx_extended },
1098                 { "no_reset", &aic7xxx_no_reset },
1099                 { "verbose", &aic7xxx_verbose },
1100                 { "allow_memio", &aic7xxx_allow_memio},
1101 #ifdef AHC_DEBUG
1102                 { "debug", &ahc_debug },
1103 #endif
1104                 { "reverse_scan", &aic7xxx_reverse_scan },
1105                 { "no_probe", &aic7xxx_probe_eisa_vl },
1106                 { "probe_eisa_vl", &aic7xxx_probe_eisa_vl },
1107                 { "periodic_otag", &aic7xxx_periodic_otag },
1108                 { "pci_parity", &aic7xxx_pci_parity },
1109                 { "seltime", &aic7xxx_seltime },
1110                 { "tag_info", NULL },
1111                 { "global_tag_depth", NULL },
1112                 { "dv", NULL }
1113         };
1114
1115         end = strchr(s, '\0');
1116
1117         /*
1118          * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS
1119          * will never be 0 in this case.
1120          */
1121         n = 0;
1122
1123         while ((p = strsep(&s, ",.")) != NULL) {
1124                 if (*p == '\0')
1125                         continue;
1126                 for (i = 0; i < NUM_ELEMENTS(options); i++) {
1127
1128                         n = strlen(options[i].name);
1129                         if (strncmp(options[i].name, p, n) == 0)
1130                                 break;
1131                 }
1132                 if (i == NUM_ELEMENTS(options))
1133                         continue;
1134
1135                 if (strncmp(p, "global_tag_depth", n) == 0) {
1136                         ahc_linux_setup_tag_info_global(p + n);
1137                 } else if (strncmp(p, "tag_info", n) == 0) {
1138                         s = aic_parse_brace_option("tag_info", p + n, end,
1139                             2, ahc_linux_setup_tag_info, 0);
1140                 } else if (p[n] == ':') {
1141                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1142                 } else if (strncmp(p, "verbose", n) == 0) {
1143                         *(options[i].flag) = 1;
1144                 } else {
1145                         *(options[i].flag) ^= 0xFFFFFFFF;
1146                 }
1147         }
1148         return 1;
1149 }
1150
1151 __setup("aic7xxx=", aic7xxx_setup);
1152
1153 uint32_t aic7xxx_verbose;
1154
1155 int
1156 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1157 {
1158         char     buf[80];
1159         struct   Scsi_Host *host;
1160         char    *new_name;
1161         u_long   s;
1162
1163         template->name = ahc->description;
1164         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1165         if (host == NULL)
1166                 return (ENOMEM);
1167
1168         *((struct ahc_softc **)host->hostdata) = ahc;
1169         ahc_lock(ahc, &s);
1170         scsi_assign_lock(host, &ahc->platform_data->spin_lock);
1171         ahc->platform_data->host = host;
1172         host->can_queue = AHC_MAX_QUEUE;
1173         host->cmd_per_lun = 2;
1174         /* XXX No way to communicate the ID for multiple channels */
1175         host->this_id = ahc->our_id;
1176         host->irq = ahc->platform_data->irq;
1177         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1178         host->max_lun = AHC_NUM_LUNS;
1179         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1180         host->sg_tablesize = AHC_NSEG;
1181         ahc_set_unit(ahc, ahc_linux_next_unit());
1182         sprintf(buf, "scsi%d", host->host_no);
1183         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1184         if (new_name != NULL) {
1185                 strcpy(new_name, buf);
1186                 ahc_set_name(ahc, new_name);
1187         }
1188         host->unique_id = ahc->unit;
1189         ahc_linux_initialize_scsi_bus(ahc);
1190         ahc_intr_enable(ahc, TRUE);
1191         ahc_unlock(ahc, &s);
1192
1193         host->transportt = ahc_linux_transport_template;
1194
1195         scsi_add_host(host, (ahc->dev_softc ? &ahc->dev_softc->dev : NULL)); /* XXX handle failure */
1196         scsi_scan_host(host);
1197         return (0);
1198 }
1199
1200 uint64_t
1201 ahc_linux_get_memsize(void)
1202 {
1203         struct sysinfo si;
1204
1205         si_meminfo(&si);
1206         return ((uint64_t)si.totalram << PAGE_SHIFT);
1207 }
1208
1209 /*
1210  * Find the smallest available unit number to use
1211  * for a new device.  We don't just use a static
1212  * count to handle the "repeated hot-(un)plug"
1213  * scenario.
1214  */
1215 static int
1216 ahc_linux_next_unit(void)
1217 {
1218         struct ahc_softc *ahc;
1219         int unit;
1220
1221         unit = 0;
1222 retry:
1223         TAILQ_FOREACH(ahc, &ahc_tailq, links) {
1224                 if (ahc->unit == unit) {
1225                         unit++;
1226                         goto retry;
1227                 }
1228         }
1229         return (unit);
1230 }
1231
1232 /*
1233  * Place the SCSI bus into a known state by either resetting it,
1234  * or forcing transfer negotiations on the next command to any
1235  * target.
1236  */
1237 void
1238 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1239 {
1240         int i;
1241         int numtarg;
1242
1243         i = 0;
1244         numtarg = 0;
1245
1246         if (aic7xxx_no_reset != 0)
1247                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1248
1249         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1250                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1251         else
1252                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1253
1254         if ((ahc->features & AHC_TWIN) != 0) {
1255
1256                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1257                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1258                 } else {
1259                         if (numtarg == 0)
1260                                 i = 8;
1261                         numtarg += 8;
1262                 }
1263         }
1264
1265         /*
1266          * Force negotiation to async for all targets that
1267          * will not see an initial bus reset.
1268          */
1269         for (; i < numtarg; i++) {
1270                 struct ahc_devinfo devinfo;
1271                 struct ahc_initiator_tinfo *tinfo;
1272                 struct ahc_tmode_tstate *tstate;
1273                 u_int our_id;
1274                 u_int target_id;
1275                 char channel;
1276
1277                 channel = 'A';
1278                 our_id = ahc->our_id;
1279                 target_id = i;
1280                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1281                         channel = 'B';
1282                         our_id = ahc->our_id_b;
1283                         target_id = i % 8;
1284                 }
1285                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1286                                             target_id, &tstate);
1287                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1288                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1289                 ahc_update_neg_request(ahc, &devinfo, tstate,
1290                                        tinfo, AHC_NEG_ALWAYS);
1291         }
1292         /* Give the bus some time to recover */
1293         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1294                 ahc_linux_freeze_simq(ahc);
1295                 init_timer(&ahc->platform_data->reset_timer);
1296                 ahc->platform_data->reset_timer.data = (u_long)ahc;
1297                 ahc->platform_data->reset_timer.expires =
1298                     jiffies + (AIC7XXX_RESET_DELAY * HZ)/1000;
1299                 ahc->platform_data->reset_timer.function =
1300                     ahc_linux_release_simq;
1301                 add_timer(&ahc->platform_data->reset_timer);
1302         }
1303 }
1304
1305 int
1306 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1307 {
1308
1309         ahc->platform_data =
1310             malloc(sizeof(struct ahc_platform_data), M_DEVBUF, M_NOWAIT);
1311         if (ahc->platform_data == NULL)
1312                 return (ENOMEM);
1313         memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data));
1314         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1315         ahc_lockinit(ahc);
1316         init_MUTEX_LOCKED(&ahc->platform_data->eh_sem);
1317         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1318         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1319         if (aic7xxx_pci_parity == 0)
1320                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1321
1322         return (0);
1323 }
1324
1325 void
1326 ahc_platform_free(struct ahc_softc *ahc)
1327 {
1328         struct ahc_linux_target *targ;
1329         struct ahc_linux_device *dev;
1330         int i, j;
1331
1332         if (ahc->platform_data != NULL) {
1333                 if (ahc->platform_data->host != NULL) {
1334                         scsi_remove_host(ahc->platform_data->host);
1335                         scsi_host_put(ahc->platform_data->host);
1336                 }
1337
1338                 /* destroy all of the device and target objects */
1339                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1340                         targ = ahc->platform_data->targets[i];
1341                         if (targ != NULL) {
1342                                 /* Keep target around through the loop. */
1343                                 targ->refcount++;
1344                                 for (j = 0; j < AHC_NUM_LUNS; j++) {
1345
1346                                         if (targ->devices[j] == NULL)
1347                                                 continue;
1348                                         dev = targ->devices[j];
1349                                         ahc_linux_free_device(ahc, dev);
1350                                 }
1351                                 /*
1352                                  * Forcibly free the target now that
1353                                  * all devices are gone.
1354                                  */
1355                                 ahc_linux_free_target(ahc, targ);
1356                         }
1357                 }
1358
1359                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1360                         free_irq(ahc->platform_data->irq, ahc);
1361                 if (ahc->tag == BUS_SPACE_PIO
1362                  && ahc->bsh.ioport != 0)
1363                         release_region(ahc->bsh.ioport, 256);
1364                 if (ahc->tag == BUS_SPACE_MEMIO
1365                  && ahc->bsh.maddr != NULL) {
1366                         iounmap(ahc->bsh.maddr);
1367                         release_mem_region(ahc->platform_data->mem_busaddr,
1368                                            0x1000);
1369                 }
1370
1371                 free(ahc->platform_data, M_DEVBUF);
1372         }
1373 }
1374
1375 void
1376 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1377 {
1378         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1379                                 SCB_GET_CHANNEL(ahc, scb),
1380                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1381                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1382 }
1383
1384 void
1385 ahc_platform_set_tags(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
1386                       ahc_queue_alg alg)
1387 {
1388         struct ahc_linux_device *dev;
1389         int was_queuing;
1390         int now_queuing;
1391
1392         dev = ahc_linux_get_device(ahc, devinfo->channel - 'A',
1393                                    devinfo->target,
1394                                    devinfo->lun);
1395         if (dev == NULL)
1396                 return;
1397         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1398         switch (alg) {
1399         default:
1400         case AHC_QUEUE_NONE:
1401                 now_queuing = 0;
1402                 break; 
1403         case AHC_QUEUE_BASIC:
1404                 now_queuing = AHC_DEV_Q_BASIC;
1405                 break;
1406         case AHC_QUEUE_TAGGED:
1407                 now_queuing = AHC_DEV_Q_TAGGED;
1408                 break;
1409         }
1410         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1411          && (was_queuing != now_queuing)
1412          && (dev->active != 0)) {
1413                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1414                 dev->qfrozen++;
1415         }
1416
1417         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1418         if (now_queuing) {
1419                 u_int usertags;
1420
1421                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1422                 if (!was_queuing) {
1423                         /*
1424                          * Start out agressively and allow our
1425                          * dynamic queue depth algorithm to take
1426                          * care of the rest.
1427                          */
1428                         dev->maxtags = usertags;
1429                         dev->openings = dev->maxtags - dev->active;
1430                 }
1431                 if (dev->maxtags == 0) {
1432                         /*
1433                          * Queueing is disabled by the user.
1434                          */
1435                         dev->openings = 1;
1436                 } else if (alg == AHC_QUEUE_TAGGED) {
1437                         dev->flags |= AHC_DEV_Q_TAGGED;
1438                         if (aic7xxx_periodic_otag != 0)
1439                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1440                 } else
1441                         dev->flags |= AHC_DEV_Q_BASIC;
1442         } else {
1443                 /* We can only have one opening. */
1444                 dev->maxtags = 0;
1445                 dev->openings =  1 - dev->active;
1446         }
1447         if (dev->scsi_device != NULL) {
1448                 switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1449                 case AHC_DEV_Q_BASIC:
1450                         scsi_adjust_queue_depth(dev->scsi_device,
1451                                                 MSG_SIMPLE_TASK,
1452                                                 dev->openings + dev->active);
1453                         break;
1454                 case AHC_DEV_Q_TAGGED:
1455                         scsi_adjust_queue_depth(dev->scsi_device,
1456                                                 MSG_ORDERED_TASK,
1457                                                 dev->openings + dev->active);
1458                         break;
1459                 default:
1460                         /*
1461                          * We allow the OS to queue 2 untagged transactions to
1462                          * us at any time even though we can only execute them
1463                          * serially on the controller/device.  This should
1464                          * remove some latency.
1465                          */
1466                         scsi_adjust_queue_depth(dev->scsi_device,
1467                                                 /*NON-TAGGED*/0,
1468                                                 /*queue depth*/2);
1469                         break;
1470                 }
1471         }
1472 }
1473
1474 int
1475 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1476                         int lun, u_int tag, role_t role, uint32_t status)
1477 {
1478         return 0;
1479 }
1480
1481 static u_int
1482 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1483 {
1484         static int warned_user;
1485         u_int tags;
1486
1487         tags = 0;
1488         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1489                 if (ahc->unit >= NUM_ELEMENTS(aic7xxx_tag_info)) {
1490                         if (warned_user == 0) {
1491
1492                                 printf(KERN_WARNING
1493 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1494 "aic7xxx: for installed controllers. Using defaults\n"
1495 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1496 "aic7xxx: the aic7xxx_osm..c source file.\n");
1497                                 warned_user++;
1498                         }
1499                         tags = AHC_MAX_QUEUE;
1500                 } else {
1501                         adapter_tag_info_t *tag_info;
1502
1503                         tag_info = &aic7xxx_tag_info[ahc->unit];
1504                         tags = tag_info->tag_commands[devinfo->target_offset];
1505                         if (tags > AHC_MAX_QUEUE)
1506                                 tags = AHC_MAX_QUEUE;
1507                 }
1508         }
1509         return (tags);
1510 }
1511
1512 /*
1513  * Determines the queue depth for a given device.
1514  */
1515 static void
1516 ahc_linux_device_queue_depth(struct ahc_softc *ahc,
1517                              struct ahc_linux_device *dev)
1518 {
1519         struct  ahc_devinfo devinfo;
1520         u_int   tags;
1521
1522         ahc_compile_devinfo(&devinfo,
1523                             dev->target->channel == 0
1524                           ? ahc->our_id : ahc->our_id_b,
1525                             dev->target->target, dev->lun,
1526                             dev->target->channel == 0 ? 'A' : 'B',
1527                             ROLE_INITIATOR);
1528         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1529         if (tags != 0
1530          && dev->scsi_device != NULL
1531          && dev->scsi_device->tagged_supported != 0) {
1532
1533                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_TAGGED);
1534                 ahc_print_devinfo(ahc, &devinfo);
1535                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1536         } else {
1537                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_NONE);
1538         }
1539 }
1540
1541 static int
1542 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1543                       struct scsi_cmnd *cmd)
1544 {
1545         struct   scb *scb;
1546         struct   hardware_scb *hscb;
1547         struct   ahc_initiator_tinfo *tinfo;
1548         struct   ahc_tmode_tstate *tstate;
1549         uint16_t mask;
1550         struct scb_tailq *untagged_q = NULL;
1551
1552         /*
1553          * Schedule us to run later.  The only reason we are not
1554          * running is because the whole controller Q is frozen.
1555          */
1556         if (ahc->platform_data->qfrozen != 0)
1557                 return SCSI_MLQUEUE_HOST_BUSY;
1558
1559         /*
1560          * We only allow one untagged transaction
1561          * per target in the initiator role unless
1562          * we are storing a full busy target *lun*
1563          * table in SCB space.
1564          */
1565         if (!blk_rq_tagged(cmd->request)
1566             && (ahc->features & AHC_SCB_BTT) == 0) {
1567                 int target_offset;
1568
1569                 target_offset = cmd->device->id + cmd->device->channel * 8;
1570                 untagged_q = &(ahc->untagged_queues[target_offset]);
1571                 if (!TAILQ_EMPTY(untagged_q))
1572                         /* if we're already executing an untagged command
1573                          * we're busy to another */
1574                         return SCSI_MLQUEUE_DEVICE_BUSY;
1575         }
1576
1577         /*
1578          * Get an scb to use.
1579          */
1580         if ((scb = ahc_get_scb(ahc)) == NULL) {
1581                         ahc->flags |= AHC_RESOURCE_SHORTAGE;
1582                         return SCSI_MLQUEUE_HOST_BUSY;
1583         }
1584
1585         scb->io_ctx = cmd;
1586         scb->platform_data->dev = dev;
1587         hscb = scb->hscb;
1588         cmd->host_scribble = (char *)scb;
1589
1590         /*
1591          * Fill out basics of the HSCB.
1592          */
1593         hscb->control = 0;
1594         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1595         hscb->lun = cmd->device->lun;
1596         mask = SCB_GET_TARGET_MASK(ahc, scb);
1597         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1598                                     SCB_GET_OUR_ID(scb),
1599                                     SCB_GET_TARGET(ahc, scb), &tstate);
1600         hscb->scsirate = tinfo->scsirate;
1601         hscb->scsioffset = tinfo->curr.offset;
1602         if ((tstate->ultraenb & mask) != 0)
1603                 hscb->control |= ULTRAENB;
1604         
1605         if ((ahc->user_discenable & mask) != 0)
1606                 hscb->control |= DISCENB;
1607         
1608         if ((tstate->auto_negotiate & mask) != 0) {
1609                 scb->flags |= SCB_AUTO_NEGOTIATE;
1610                 scb->hscb->control |= MK_MESSAGE;
1611         }
1612
1613         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1614                 int     msg_bytes;
1615                 uint8_t tag_msgs[2];
1616                 
1617                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1618                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1619                         hscb->control |= tag_msgs[0];
1620                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1621                                 dev->commands_since_idle_or_otag = 0;
1622                 } else if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1623                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1624                         hscb->control |= MSG_ORDERED_TASK;
1625                         dev->commands_since_idle_or_otag = 0;
1626                 } else {
1627                         hscb->control |= MSG_SIMPLE_TASK;
1628                 }
1629         }
1630
1631         hscb->cdb_len = cmd->cmd_len;
1632         if (hscb->cdb_len <= 12) {
1633                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1634         } else {
1635                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1636                 scb->flags |= SCB_CDB32_PTR;
1637         }
1638
1639         scb->platform_data->xfer_len = 0;
1640         ahc_set_residual(scb, 0);
1641         ahc_set_sense_residual(scb, 0);
1642         scb->sg_count = 0;
1643         if (cmd->use_sg != 0) {
1644                 struct  ahc_dma_seg *sg;
1645                 struct  scatterlist *cur_seg;
1646                 struct  scatterlist *end_seg;
1647                 int     nseg;
1648
1649                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1650                 nseg = pci_map_sg(ahc->dev_softc, cur_seg, cmd->use_sg,
1651                                   cmd->sc_data_direction);
1652                 end_seg = cur_seg + nseg;
1653                 /* Copy the segments into the SG list. */
1654                 sg = scb->sg_list;
1655                 /*
1656                  * The sg_count may be larger than nseg if
1657                  * a transfer crosses a 32bit page.
1658                  */ 
1659                 while (cur_seg < end_seg) {
1660                         dma_addr_t addr;
1661                         bus_size_t len;
1662                         int consumed;
1663
1664                         addr = sg_dma_address(cur_seg);
1665                         len = sg_dma_len(cur_seg);
1666                         consumed = ahc_linux_map_seg(ahc, scb,
1667                                                      sg, addr, len);
1668                         sg += consumed;
1669                         scb->sg_count += consumed;
1670                         cur_seg++;
1671                 }
1672                 sg--;
1673                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1674
1675                 /*
1676                  * Reset the sg list pointer.
1677                  */
1678                 scb->hscb->sgptr =
1679                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1680                 
1681                 /*
1682                  * Copy the first SG into the "current"
1683                  * data pointer area.
1684                  */
1685                 scb->hscb->dataptr = scb->sg_list->addr;
1686                 scb->hscb->datacnt = scb->sg_list->len;
1687         } else if (cmd->request_bufflen != 0) {
1688                 struct   ahc_dma_seg *sg;
1689                 dma_addr_t addr;
1690
1691                 sg = scb->sg_list;
1692                 addr = pci_map_single(ahc->dev_softc,
1693                                       cmd->request_buffer,
1694                                       cmd->request_bufflen,
1695                                       cmd->sc_data_direction);
1696                 scb->platform_data->buf_busaddr = addr;
1697                 scb->sg_count = ahc_linux_map_seg(ahc, scb,
1698                                                   sg, addr,
1699                                                   cmd->request_bufflen);
1700                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1701
1702                 /*
1703                  * Reset the sg list pointer.
1704                  */
1705                 scb->hscb->sgptr =
1706                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1707
1708                 /*
1709                  * Copy the first SG into the "current"
1710                  * data pointer area.
1711                  */
1712                 scb->hscb->dataptr = sg->addr;
1713                 scb->hscb->datacnt = sg->len;
1714         } else {
1715                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1716                 scb->hscb->dataptr = 0;
1717                 scb->hscb->datacnt = 0;
1718                 scb->sg_count = 0;
1719         }
1720
1721         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1722         dev->openings--;
1723         dev->active++;
1724         dev->commands_issued++;
1725         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1726                 dev->commands_since_idle_or_otag++;
1727         
1728         scb->flags |= SCB_ACTIVE;
1729         if (untagged_q) {
1730                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1731                 scb->flags |= SCB_UNTAGGEDQ;
1732         }
1733         ahc_queue_scb(ahc, scb);
1734         return 0;
1735 }
1736
1737 /*
1738  * SCSI controller interrupt handler.
1739  */
1740 irqreturn_t
1741 ahc_linux_isr(int irq, void *dev_id, struct pt_regs * regs)
1742 {
1743         struct  ahc_softc *ahc;
1744         u_long  flags;
1745         int     ours;
1746
1747         ahc = (struct ahc_softc *) dev_id;
1748         ahc_lock(ahc, &flags); 
1749         ours = ahc_intr(ahc);
1750         ahc_unlock(ahc, &flags);
1751         return IRQ_RETVAL(ours);
1752 }
1753
1754 void
1755 ahc_platform_flushwork(struct ahc_softc *ahc)
1756 {
1757
1758 }
1759
1760 static struct ahc_linux_target*
1761 ahc_linux_alloc_target(struct ahc_softc *ahc, u_int channel, u_int target)
1762 {
1763         struct ahc_linux_target *targ;
1764         u_int target_offset;
1765
1766         target_offset = target;
1767         if (channel != 0)
1768                 target_offset += 8;
1769
1770         targ = malloc(sizeof(*targ), M_DEVBUG, M_NOWAIT);
1771         if (targ == NULL)
1772                 return (NULL);
1773         memset(targ, 0, sizeof(*targ));
1774         targ->channel = channel;
1775         targ->target = target;
1776         targ->ahc = ahc;
1777         ahc->platform_data->targets[target_offset] = targ;
1778         return (targ);
1779 }
1780
1781 static void
1782 ahc_linux_free_target(struct ahc_softc *ahc, struct ahc_linux_target *targ)
1783 {
1784         struct ahc_devinfo devinfo;
1785         struct ahc_initiator_tinfo *tinfo;
1786         struct ahc_tmode_tstate *tstate;
1787         u_int our_id;
1788         u_int target_offset;
1789         char channel;
1790
1791         /*
1792          * Force a negotiation to async/narrow on any
1793          * future command to this device unless a bus
1794          * reset occurs between now and that command.
1795          */
1796         channel = 'A' + targ->channel;
1797         our_id = ahc->our_id;
1798         target_offset = targ->target;
1799         if (targ->channel != 0) {
1800                 target_offset += 8;
1801                 our_id = ahc->our_id_b;
1802         }
1803         tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1804                                     targ->target, &tstate);
1805         ahc_compile_devinfo(&devinfo, our_id, targ->target, CAM_LUN_WILDCARD,
1806                             channel, ROLE_INITIATOR);
1807         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
1808                          AHC_TRANS_GOAL, /*paused*/FALSE);
1809         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
1810                       AHC_TRANS_GOAL, /*paused*/FALSE);
1811         ahc_update_neg_request(ahc, &devinfo, tstate, tinfo, AHC_NEG_ALWAYS);
1812         ahc->platform_data->targets[target_offset] = NULL;
1813         free(targ, M_DEVBUF);
1814 }
1815
1816 static struct ahc_linux_device*
1817 ahc_linux_alloc_device(struct ahc_softc *ahc,
1818                  struct ahc_linux_target *targ, u_int lun)
1819 {
1820         struct ahc_linux_device *dev;
1821
1822         dev = malloc(sizeof(*dev), M_DEVBUG, M_NOWAIT);
1823         if (dev == NULL)
1824                 return (NULL);
1825         memset(dev, 0, sizeof(*dev));
1826         dev->lun = lun;
1827         dev->target = targ;
1828
1829         /*
1830          * We start out life using untagged
1831          * transactions of which we allow one.
1832          */
1833         dev->openings = 1;
1834
1835         /*
1836          * Set maxtags to 0.  This will be changed if we
1837          * later determine that we are dealing with
1838          * a tagged queuing capable device.
1839          */
1840         dev->maxtags = 0;
1841         
1842         targ->refcount++;
1843         targ->devices[lun] = dev;
1844         return (dev);
1845 }
1846
1847 static void
1848 ahc_linux_free_device(struct ahc_softc *ahc, struct ahc_linux_device *dev)
1849 {
1850         struct ahc_linux_target *targ;
1851
1852         targ = dev->target;
1853         targ->devices[dev->lun] = NULL;
1854         free(dev, M_DEVBUF);
1855         targ->refcount--;
1856         if (targ->refcount == 0)
1857                 ahc_linux_free_target(ahc, targ);
1858 }
1859
1860 void
1861 ahc_send_async(struct ahc_softc *ahc, char channel,
1862                u_int target, u_int lun, ac_code code, void *arg)
1863 {
1864         switch (code) {
1865         case AC_TRANSFER_NEG:
1866         {
1867                 char    buf[80];
1868                 struct  ahc_linux_target *targ;
1869                 struct  info_str info;
1870                 struct  ahc_initiator_tinfo *tinfo;
1871                 struct  ahc_tmode_tstate *tstate;
1872                 int     target_offset;
1873
1874                 info.buffer = buf;
1875                 info.length = sizeof(buf);
1876                 info.offset = 0;
1877                 info.pos = 0;
1878                 tinfo = ahc_fetch_transinfo(ahc, channel,
1879                                                 channel == 'A' ? ahc->our_id
1880                                                                : ahc->our_id_b,
1881                                                 target, &tstate);
1882
1883                 /*
1884                  * Don't bother reporting results while
1885                  * negotiations are still pending.
1886                  */
1887                 if (tinfo->curr.period != tinfo->goal.period
1888                  || tinfo->curr.width != tinfo->goal.width
1889                  || tinfo->curr.offset != tinfo->goal.offset
1890                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1891                         if (bootverbose == 0)
1892                                 break;
1893
1894                 /*
1895                  * Don't bother reporting results that
1896                  * are identical to those last reported.
1897                  */
1898                 target_offset = target;
1899                 if (channel == 'B')
1900                         target_offset += 8;
1901                 targ = ahc->platform_data->targets[target_offset];
1902                 if (targ == NULL)
1903                         break;
1904                 if (tinfo->curr.period == targ->last_tinfo.period
1905                  && tinfo->curr.width == targ->last_tinfo.width
1906                  && tinfo->curr.offset == targ->last_tinfo.offset
1907                  && tinfo->curr.ppr_options == targ->last_tinfo.ppr_options)
1908                         if (bootverbose == 0)
1909                                 break;
1910
1911                 targ->last_tinfo.period = tinfo->curr.period;
1912                 targ->last_tinfo.width = tinfo->curr.width;
1913                 targ->last_tinfo.offset = tinfo->curr.offset;
1914                 targ->last_tinfo.ppr_options = tinfo->curr.ppr_options;
1915
1916                 printf("(%s:%c:", ahc_name(ahc), channel);
1917                 if (target == CAM_TARGET_WILDCARD)
1918                         printf("*): ");
1919                 else
1920                         printf("%d): ", target);
1921                 ahc_format_transinfo(&info, &tinfo->curr);
1922                 if (info.pos < info.length)
1923                         *info.buffer = '\0';
1924                 else
1925                         buf[info.length - 1] = '\0';
1926                 printf("%s", buf);
1927                 break;
1928         }
1929         case AC_SENT_BDR:
1930         {
1931                 WARN_ON(lun != CAM_LUN_WILDCARD);
1932                 scsi_report_device_reset(ahc->platform_data->host,
1933                                          channel - 'A', target);
1934                 break;
1935         }
1936         case AC_BUS_RESET:
1937                 if (ahc->platform_data->host != NULL) {
1938                         scsi_report_bus_reset(ahc->platform_data->host,
1939                                               channel - 'A');
1940                 }
1941                 break;
1942         default:
1943                 panic("ahc_send_async: Unexpected async event");
1944         }
1945 }
1946
1947 /*
1948  * Calls the higher level scsi done function and frees the scb.
1949  */
1950 void
1951 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1952 {
1953         struct scsi_cmnd *cmd;
1954         struct     ahc_linux_device *dev;
1955
1956         LIST_REMOVE(scb, pending_links);
1957         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1958                 struct scb_tailq *untagged_q;
1959                 int target_offset;
1960
1961                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1962                 untagged_q = &(ahc->untagged_queues[target_offset]);
1963                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1964                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1965         }
1966
1967         if ((scb->flags & SCB_ACTIVE) == 0) {
1968                 printf("SCB %d done'd twice\n", scb->hscb->tag);
1969                 ahc_dump_card_state(ahc);
1970                 panic("Stopping for safety");
1971         }
1972         cmd = scb->io_ctx;
1973         dev = scb->platform_data->dev;
1974         dev->active--;
1975         dev->openings++;
1976         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1977                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1978                 dev->qfrozen--;
1979         }
1980         ahc_linux_unmap_scb(ahc, scb);
1981
1982         /*
1983          * Guard against stale sense data.
1984          * The Linux mid-layer assumes that sense
1985          * was retrieved anytime the first byte of
1986          * the sense buffer looks "sane".
1987          */
1988         cmd->sense_buffer[0] = 0;
1989         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1990                 uint32_t amount_xferred;
1991
1992                 amount_xferred =
1993                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1994                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1995 #ifdef AHC_DEBUG
1996                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1997                                 ahc_print_path(ahc, scb);
1998                                 printf("Set CAM_UNCOR_PARITY\n");
1999                         }
2000 #endif
2001                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
2002 #ifdef AHC_REPORT_UNDERFLOWS
2003                 /*
2004                  * This code is disabled by default as some
2005                  * clients of the SCSI system do not properly
2006                  * initialize the underflow parameter.  This
2007                  * results in spurious termination of commands
2008                  * that complete as expected (e.g. underflow is
2009                  * allowed as command can return variable amounts
2010                  * of data.
2011                  */
2012                 } else if (amount_xferred < scb->io_ctx->underflow) {
2013                         u_int i;
2014
2015                         ahc_print_path(ahc, scb);
2016                         printf("CDB:");
2017                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
2018                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
2019                         printf("\n");
2020                         ahc_print_path(ahc, scb);
2021                         printf("Saw underflow (%ld of %ld bytes). "
2022                                "Treated as error\n",
2023                                 ahc_get_residual(scb),
2024                                 ahc_get_transfer_length(scb));
2025                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
2026 #endif
2027                 } else {
2028                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
2029                 }
2030         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
2031                 ahc_linux_handle_scsi_status(ahc, dev, scb);
2032         }
2033
2034         if (dev->openings == 1
2035          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
2036          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
2037                 dev->tag_success_count++;
2038         /*
2039          * Some devices deal with temporary internal resource
2040          * shortages by returning queue full.  When the queue
2041          * full occurrs, we throttle back.  Slowly try to get
2042          * back to our previous queue depth.
2043          */
2044         if ((dev->openings + dev->active) < dev->maxtags
2045          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
2046                 dev->tag_success_count = 0;
2047                 dev->openings++;
2048         }
2049
2050         if (dev->active == 0)
2051                 dev->commands_since_idle_or_otag = 0;
2052
2053         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
2054                 printf("Recovery SCB completes\n");
2055                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
2056                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
2057                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
2058                 if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
2059                         ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
2060                         up(&ahc->platform_data->eh_sem);
2061                 }
2062         }
2063
2064         ahc_free_scb(ahc, scb);
2065         ahc_linux_queue_cmd_complete(ahc, cmd);
2066 }
2067
2068 static void
2069 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
2070                              struct ahc_linux_device *dev, struct scb *scb)
2071 {
2072         struct  ahc_devinfo devinfo;
2073
2074         ahc_compile_devinfo(&devinfo,
2075                             ahc->our_id,
2076                             dev->target->target, dev->lun,
2077                             dev->target->channel == 0 ? 'A' : 'B',
2078                             ROLE_INITIATOR);
2079         
2080         /*
2081          * We don't currently trust the mid-layer to
2082          * properly deal with queue full or busy.  So,
2083          * when one occurs, we tell the mid-layer to
2084          * unconditionally requeue the command to us
2085          * so that we can retry it ourselves.  We also
2086          * implement our own throttling mechanism so
2087          * we don't clobber the device with too many
2088          * commands.
2089          */
2090         switch (ahc_get_scsi_status(scb)) {
2091         default:
2092                 break;
2093         case SCSI_STATUS_CHECK_COND:
2094         case SCSI_STATUS_CMD_TERMINATED:
2095         {
2096                 struct scsi_cmnd *cmd;
2097
2098                 /*
2099                  * Copy sense information to the OS's cmd
2100                  * structure if it is available.
2101                  */
2102                 cmd = scb->io_ctx;
2103                 if (scb->flags & SCB_SENSE) {
2104                         u_int sense_size;
2105
2106                         sense_size = MIN(sizeof(struct scsi_sense_data)
2107                                        - ahc_get_sense_residual(scb),
2108                                          sizeof(cmd->sense_buffer));
2109                         memcpy(cmd->sense_buffer,
2110                                ahc_get_sense_buf(ahc, scb), sense_size);
2111                         if (sense_size < sizeof(cmd->sense_buffer))
2112                                 memset(&cmd->sense_buffer[sense_size], 0,
2113                                        sizeof(cmd->sense_buffer) - sense_size);
2114                         cmd->result |= (DRIVER_SENSE << 24);
2115 #ifdef AHC_DEBUG
2116                         if (ahc_debug & AHC_SHOW_SENSE) {
2117                                 int i;
2118
2119                                 printf("Copied %d bytes of sense data:",
2120                                        sense_size);
2121                                 for (i = 0; i < sense_size; i++) {
2122                                         if ((i & 0xF) == 0)
2123                                                 printf("\n");
2124                                         printf("0x%x ", cmd->sense_buffer[i]);
2125                                 }
2126                                 printf("\n");
2127                         }
2128 #endif
2129                 }
2130                 break;
2131         }
2132         case SCSI_STATUS_QUEUE_FULL:
2133         {
2134                 /*
2135                  * By the time the core driver has returned this
2136                  * command, all other commands that were queued
2137                  * to us but not the device have been returned.
2138                  * This ensures that dev->active is equal to
2139                  * the number of commands actually queued to
2140                  * the device.
2141                  */
2142                 dev->tag_success_count = 0;
2143                 if (dev->active != 0) {
2144                         /*
2145                          * Drop our opening count to the number
2146                          * of commands currently outstanding.
2147                          */
2148                         dev->openings = 0;
2149 /*
2150                         ahc_print_path(ahc, scb);
2151                         printf("Dropping tag count to %d\n", dev->active);
2152  */
2153                         if (dev->active == dev->tags_on_last_queuefull) {
2154
2155                                 dev->last_queuefull_same_count++;
2156                                 /*
2157                                  * If we repeatedly see a queue full
2158                                  * at the same queue depth, this
2159                                  * device has a fixed number of tag
2160                                  * slots.  Lock in this tag depth
2161                                  * so we stop seeing queue fulls from
2162                                  * this device.
2163                                  */
2164                                 if (dev->last_queuefull_same_count
2165                                  == AHC_LOCK_TAGS_COUNT) {
2166                                         dev->maxtags = dev->active;
2167                                         ahc_print_path(ahc, scb);
2168                                         printf("Locking max tag count at %d\n",
2169                                                dev->active);
2170                                 }
2171                         } else {
2172                                 dev->tags_on_last_queuefull = dev->active;
2173                                 dev->last_queuefull_same_count = 0;
2174                         }
2175                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
2176                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
2177                         ahc_platform_set_tags(ahc, &devinfo,
2178                                      (dev->flags & AHC_DEV_Q_BASIC)
2179                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
2180                         break;
2181                 }
2182                 /*
2183                  * Drop down to a single opening, and treat this
2184                  * as if the target returned BUSY SCSI status.
2185                  */
2186                 dev->openings = 1;
2187                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
2188                 ahc_platform_set_tags(ahc, &devinfo,
2189                              (dev->flags & AHC_DEV_Q_BASIC)
2190                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
2191                 break;
2192         }
2193         }
2194 }
2195
2196 static void
2197 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
2198 {
2199         /*
2200          * Map CAM error codes into Linux Error codes.  We
2201          * avoid the conversion so that the DV code has the
2202          * full error information available when making
2203          * state change decisions.
2204          */
2205         {
2206                 u_int new_status;
2207
2208                 switch (ahc_cmd_get_transaction_status(cmd)) {
2209                 case CAM_REQ_INPROG:
2210                 case CAM_REQ_CMP:
2211                 case CAM_SCSI_STATUS_ERROR:
2212                         new_status = DID_OK;
2213                         break;
2214                 case CAM_REQ_ABORTED:
2215                         new_status = DID_ABORT;
2216                         break;
2217                 case CAM_BUSY:
2218                         new_status = DID_BUS_BUSY;
2219                         break;
2220                 case CAM_REQ_INVALID:
2221                 case CAM_PATH_INVALID:
2222                         new_status = DID_BAD_TARGET;
2223                         break;
2224                 case CAM_SEL_TIMEOUT:
2225                         new_status = DID_NO_CONNECT;
2226                         break;
2227                 case CAM_SCSI_BUS_RESET:
2228                 case CAM_BDR_SENT:
2229                         new_status = DID_RESET;
2230                         break;
2231                 case CAM_UNCOR_PARITY:
2232                         new_status = DID_PARITY;
2233                         break;
2234                 case CAM_CMD_TIMEOUT:
2235                         new_status = DID_TIME_OUT;
2236                         break;
2237                 case CAM_UA_ABORT:
2238                 case CAM_REQ_CMP_ERR:
2239                 case CAM_AUTOSENSE_FAIL:
2240                 case CAM_NO_HBA:
2241                 case CAM_DATA_RUN_ERR:
2242                 case CAM_UNEXP_BUSFREE:
2243                 case CAM_SEQUENCE_FAIL:
2244                 case CAM_CCB_LEN_ERR:
2245                 case CAM_PROVIDE_FAIL:
2246                 case CAM_REQ_TERMIO:
2247                 case CAM_UNREC_HBA_ERROR:
2248                 case CAM_REQ_TOO_BIG:
2249                         new_status = DID_ERROR;
2250                         break;
2251                 case CAM_REQUEUE_REQ:
2252                         new_status = DID_REQUEUE;
2253                         break;
2254                 default:
2255                         /* We should never get here */
2256                         new_status = DID_ERROR;
2257                         break;
2258                 }
2259
2260                 ahc_cmd_set_transaction_status(cmd, new_status);
2261         }
2262
2263         cmd->scsi_done(cmd);
2264 }
2265
2266 static void
2267 ahc_linux_sem_timeout(u_long arg)
2268 {
2269         struct  ahc_softc *ahc;
2270         u_long  s;
2271
2272         ahc = (struct ahc_softc *)arg;
2273
2274         ahc_lock(ahc, &s);
2275         if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
2276                 ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
2277                 up(&ahc->platform_data->eh_sem);
2278         }
2279         ahc_unlock(ahc, &s);
2280 }
2281
2282 static void
2283 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2284 {
2285         ahc->platform_data->qfrozen++;
2286         if (ahc->platform_data->qfrozen == 1) {
2287                 scsi_block_requests(ahc->platform_data->host);
2288
2289                 /* XXX What about Twin channels? */
2290                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2291                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2292                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2293         }
2294 }
2295
2296 static void
2297 ahc_linux_release_simq(u_long arg)
2298 {
2299         struct ahc_softc *ahc;
2300         u_long s;
2301         int    unblock_reqs;
2302
2303         ahc = (struct ahc_softc *)arg;
2304
2305         unblock_reqs = 0;
2306         ahc_lock(ahc, &s);
2307         if (ahc->platform_data->qfrozen > 0)
2308                 ahc->platform_data->qfrozen--;
2309         if (ahc->platform_data->qfrozen == 0)
2310                 unblock_reqs = 1;
2311         ahc_unlock(ahc, &s);
2312         /*
2313          * There is still a race here.  The mid-layer
2314          * should keep its own freeze count and use
2315          * a bottom half handler to run the queues
2316          * so we can unblock with our own lock held.
2317          */
2318         if (unblock_reqs)
2319                 scsi_unblock_requests(ahc->platform_data->host);
2320 }
2321
2322 static int
2323 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2324 {
2325         struct ahc_softc *ahc;
2326         struct ahc_linux_device *dev;
2327         struct scb *pending_scb;
2328         u_int  saved_scbptr;
2329         u_int  active_scb_index;
2330         u_int  last_phase;
2331         u_int  saved_scsiid;
2332         u_int  cdb_byte;
2333         int    retval;
2334         int    was_paused;
2335         int    paused;
2336         int    wait;
2337         int    disconnected;
2338
2339         pending_scb = NULL;
2340         paused = FALSE;
2341         wait = FALSE;
2342         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2343
2344         printf("%s:%d:%d:%d: Attempting to queue a%s message\n",
2345                ahc_name(ahc), cmd->device->channel,
2346                cmd->device->id, cmd->device->lun,
2347                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2348
2349         printf("CDB:");
2350         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2351                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2352         printf("\n");
2353
2354         /*
2355          * First determine if we currently own this command.
2356          * Start by searching the device queue.  If not found
2357          * there, check the pending_scb list.  If not found
2358          * at all, and the system wanted us to just abort the
2359          * command, return success.
2360          */
2361         dev = ahc_linux_get_device(ahc, cmd->device->channel, cmd->device->id,
2362                                    cmd->device->lun);
2363
2364         if (dev == NULL) {
2365                 /*
2366                  * No target device for this command exists,
2367                  * so we must not still own the command.
2368                  */
2369                 printf("%s:%d:%d:%d: Is not an active device\n",
2370                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2371                        cmd->device->lun);
2372                 retval = SUCCESS;
2373                 goto no_cmd;
2374         }
2375
2376         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2377          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2378                                        cmd->device->channel + 'A',
2379                                        cmd->device->lun,
2380                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2381                 printf("%s:%d:%d:%d: Command found on untagged queue\n",
2382                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2383                        cmd->device->lun);
2384                 retval = SUCCESS;
2385                 goto done;
2386         }
2387
2388         /*
2389          * See if we can find a matching cmd in the pending list.
2390          */
2391         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2392                 if (pending_scb->io_ctx == cmd)
2393                         break;
2394         }
2395
2396         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2397
2398                 /* Any SCB for this device will do for a target reset */
2399                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2400                         if (ahc_match_scb(ahc, pending_scb, cmd->device->id,
2401                                           cmd->device->channel + 'A',
2402                                           CAM_LUN_WILDCARD,
2403                                           SCB_LIST_NULL, ROLE_INITIATOR) == 0)
2404                                 break;
2405                 }
2406         }
2407
2408         if (pending_scb == NULL) {
2409                 printf("%s:%d:%d:%d: Command not found\n",
2410                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2411                        cmd->device->lun);
2412                 goto no_cmd;
2413         }
2414
2415         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2416                 /*
2417                  * We can't queue two recovery actions using the same SCB
2418                  */
2419                 retval = FAILED;
2420                 goto  done;
2421         }
2422
2423         /*
2424          * Ensure that the card doesn't do anything
2425          * behind our back and that we didn't "just" miss
2426          * an interrupt that would affect this cmd.
2427          */
2428         was_paused = ahc_is_paused(ahc);
2429         ahc_pause_and_flushwork(ahc);
2430         paused = TRUE;
2431
2432         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2433                 printf("%s:%d:%d:%d: Command already completed\n",
2434                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2435                        cmd->device->lun);
2436                 goto no_cmd;
2437         }
2438
2439         printf("%s: At time of recovery, card was %spaused\n",
2440                ahc_name(ahc), was_paused ? "" : "not ");
2441         ahc_dump_card_state(ahc);
2442
2443         disconnected = TRUE;
2444         if (flag == SCB_ABORT) {
2445                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2446                                        cmd->device->channel + 'A',
2447                                        cmd->device->lun,
2448                                        pending_scb->hscb->tag,
2449                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2450                                        SEARCH_COMPLETE) > 0) {
2451                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2452                                ahc_name(ahc), cmd->device->channel,
2453                                         cmd->device->id, cmd->device->lun);
2454                         retval = SUCCESS;
2455                         goto done;
2456                 }
2457         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2458                                       cmd->device->channel + 'A',
2459                                       cmd->device->lun, pending_scb->hscb->tag,
2460                                       ROLE_INITIATOR, /*status*/0,
2461                                       SEARCH_COUNT) > 0) {
2462                 disconnected = FALSE;
2463         }
2464
2465         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2466                 struct scb *bus_scb;
2467
2468                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2469                 if (bus_scb == pending_scb)
2470                         disconnected = FALSE;
2471                 else if (flag != SCB_ABORT
2472                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2473                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2474                         disconnected = FALSE;
2475         }
2476
2477         /*
2478          * At this point, pending_scb is the scb associated with the
2479          * passed in command.  That command is currently active on the
2480          * bus, is in the disconnected state, or we're hoping to find
2481          * a command for the same target active on the bus to abuse to
2482          * send a BDR.  Queue the appropriate message based on which of
2483          * these states we are in.
2484          */
2485         last_phase = ahc_inb(ahc, LASTPHASE);
2486         saved_scbptr = ahc_inb(ahc, SCBPTR);
2487         active_scb_index = ahc_inb(ahc, SCB_TAG);
2488         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2489         if (last_phase != P_BUSFREE
2490          && (pending_scb->hscb->tag == active_scb_index
2491           || (flag == SCB_DEVICE_RESET
2492            && SCSIID_TARGET(ahc, saved_scsiid) == cmd->device->id))) {
2493
2494                 /*
2495                  * We're active on the bus, so assert ATN
2496                  * and hope that the target responds.
2497                  */
2498                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2499                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2500                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2501                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2502                 printf("%s:%d:%d:%d: Device is active, asserting ATN\n",
2503                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2504                        cmd->device->lun);
2505                 wait = TRUE;
2506         } else if (disconnected) {
2507
2508                 /*
2509                  * Actually re-queue this SCB in an attempt
2510                  * to select the device before it reconnects.
2511                  * In either case (selection or reselection),
2512                  * we will now issue the approprate message
2513                  * to the timed-out device.
2514                  *
2515                  * Set the MK_MESSAGE control bit indicating
2516                  * that we desire to send a message.  We
2517                  * also set the disconnected flag since
2518                  * in the paging case there is no guarantee
2519                  * that our SCB control byte matches the
2520                  * version on the card.  We don't want the
2521                  * sequencer to abort the command thinking
2522                  * an unsolicited reselection occurred.
2523                  */
2524                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2525                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2526
2527                 /*
2528                  * Remove any cached copy of this SCB in the
2529                  * disconnected list in preparation for the
2530                  * queuing of our abort SCB.  We use the
2531                  * same element in the SCB, SCB_NEXT, for
2532                  * both the qinfifo and the disconnected list.
2533                  */
2534                 ahc_search_disc_list(ahc, cmd->device->id,
2535                                      cmd->device->channel + 'A',
2536                                      cmd->device->lun, pending_scb->hscb->tag,
2537                                      /*stop_on_first*/TRUE,
2538                                      /*remove*/TRUE,
2539                                      /*save_state*/FALSE);
2540
2541                 /*
2542                  * In the non-paging case, the sequencer will
2543                  * never re-reference the in-core SCB.
2544                  * To make sure we are notified during
2545                  * reslection, set the MK_MESSAGE flag in
2546                  * the card's copy of the SCB.
2547                  */
2548                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2549                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2550                         ahc_outb(ahc, SCB_CONTROL,
2551                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2552                 }
2553
2554                 /*
2555                  * Clear out any entries in the QINFIFO first
2556                  * so we are the next SCB for this target
2557                  * to run.
2558                  */
2559                 ahc_search_qinfifo(ahc, cmd->device->id,
2560                                    cmd->device->channel + 'A',
2561                                    cmd->device->lun, SCB_LIST_NULL,
2562                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2563                                    SEARCH_COMPLETE);
2564                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2565                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2566                 ahc_print_path(ahc, pending_scb);
2567                 printf("Device is disconnected, re-queuing SCB\n");
2568                 wait = TRUE;
2569         } else {
2570                 printf("%s:%d:%d:%d: Unable to deliver message\n",
2571                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2572                        cmd->device->lun);
2573                 retval = FAILED;
2574                 goto done;
2575         }
2576
2577 no_cmd:
2578         /*
2579          * Our assumption is that if we don't have the command, no
2580          * recovery action was required, so we return success.  Again,
2581          * the semantics of the mid-layer recovery engine are not
2582          * well defined, so this may change in time.
2583          */
2584         retval = SUCCESS;
2585 done:
2586         if (paused)
2587                 ahc_unpause(ahc);
2588         if (wait) {
2589                 struct timer_list timer;
2590                 int ret;
2591
2592                 ahc->platform_data->flags |= AHC_UP_EH_SEMAPHORE;
2593                 spin_unlock_irq(&ahc->platform_data->spin_lock);
2594                 init_timer(&timer);
2595                 timer.data = (u_long)ahc;
2596                 timer.expires = jiffies + (5 * HZ);
2597                 timer.function = ahc_linux_sem_timeout;
2598                 add_timer(&timer);
2599                 printf("Recovery code sleeping\n");
2600                 down(&ahc->platform_data->eh_sem);
2601                 printf("Recovery code awake\n");
2602                 ret = del_timer_sync(&timer);
2603                 if (ret == 0) {
2604                         printf("Timer Expired\n");
2605                         retval = FAILED;
2606                 }
2607                 spin_lock_irq(&ahc->platform_data->spin_lock);
2608         }
2609         return (retval);
2610 }
2611
2612 void
2613 ahc_platform_dump_card_state(struct ahc_softc *ahc)
2614 {
2615 }
2616
2617 static void ahc_linux_exit(void);
2618
2619 static void ahc_linux_get_width(struct scsi_target *starget)
2620 {
2621         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2622         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2623         struct ahc_tmode_tstate *tstate;
2624         struct ahc_initiator_tinfo *tinfo 
2625                 = ahc_fetch_transinfo(ahc,
2626                                       starget->channel + 'A',
2627                                       shost->this_id, starget->id, &tstate);
2628         spi_width(starget) = tinfo->curr.width;
2629 }
2630
2631 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2632 {
2633         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2634         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2635         struct ahc_devinfo devinfo;
2636         unsigned long flags;
2637
2638         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2639                             starget->channel + 'A', ROLE_INITIATOR);
2640         ahc_lock(ahc, &flags);
2641         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2642         ahc_unlock(ahc, &flags);
2643 }
2644
2645 static void ahc_linux_get_period(struct scsi_target *starget)
2646 {
2647         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2648         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2649         struct ahc_tmode_tstate *tstate;
2650         struct ahc_initiator_tinfo *tinfo 
2651                 = ahc_fetch_transinfo(ahc,
2652                                       starget->channel + 'A',
2653                                       shost->this_id, starget->id, &tstate);
2654         spi_period(starget) = tinfo->curr.period;
2655 }
2656
2657 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2658 {
2659         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2660         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2661         struct ahc_tmode_tstate *tstate;
2662         struct ahc_initiator_tinfo *tinfo 
2663                 = ahc_fetch_transinfo(ahc,
2664                                       starget->channel + 'A',
2665                                       shost->this_id, starget->id, &tstate);
2666         struct ahc_devinfo devinfo;
2667         unsigned int ppr_options = tinfo->curr.ppr_options;
2668         unsigned long flags;
2669         unsigned long offset = tinfo->curr.offset;
2670         struct ahc_syncrate *syncrate;
2671
2672         if (offset == 0)
2673                 offset = MAX_OFFSET;
2674
2675         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2676                             starget->channel + 'A', ROLE_INITIATOR);
2677
2678         /* all PPR requests apart from QAS require wide transfers */
2679         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2680                 ahc_linux_get_width(starget);
2681                 if (spi_width(starget) == 0)
2682                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2683         }
2684
2685         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2686         ahc_lock(ahc, &flags);
2687         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2688                          ppr_options, AHC_TRANS_GOAL, FALSE);
2689         ahc_unlock(ahc, &flags);
2690 }
2691
2692 static void ahc_linux_get_offset(struct scsi_target *starget)
2693 {
2694         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2695         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2696         struct ahc_tmode_tstate *tstate;
2697         struct ahc_initiator_tinfo *tinfo 
2698                 = ahc_fetch_transinfo(ahc,
2699                                       starget->channel + 'A',
2700                                       shost->this_id, starget->id, &tstate);
2701         spi_offset(starget) = tinfo->curr.offset;
2702 }
2703
2704 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2705 {
2706         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2707         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2708         struct ahc_tmode_tstate *tstate;
2709         struct ahc_initiator_tinfo *tinfo 
2710                 = ahc_fetch_transinfo(ahc,
2711                                       starget->channel + 'A',
2712                                       shost->this_id, starget->id, &tstate);
2713         struct ahc_devinfo devinfo;
2714         unsigned int ppr_options = 0;
2715         unsigned int period = 0;
2716         unsigned long flags;
2717         struct ahc_syncrate *syncrate = NULL;
2718
2719         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2720                             starget->channel + 'A', ROLE_INITIATOR);
2721         if (offset != 0) {
2722                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2723                 period = tinfo->curr.period;
2724                 ppr_options = tinfo->curr.ppr_options;
2725         }
2726         ahc_lock(ahc, &flags);
2727         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2728                          ppr_options, AHC_TRANS_GOAL, FALSE);
2729         ahc_unlock(ahc, &flags);
2730 }
2731
2732 static void ahc_linux_get_dt(struct scsi_target *starget)
2733 {
2734         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2735         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2736         struct ahc_tmode_tstate *tstate;
2737         struct ahc_initiator_tinfo *tinfo 
2738                 = ahc_fetch_transinfo(ahc,
2739                                       starget->channel + 'A',
2740                                       shost->this_id, starget->id, &tstate);
2741         spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ;
2742 }
2743
2744 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2745 {
2746         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2747         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2748         struct ahc_tmode_tstate *tstate;
2749         struct ahc_initiator_tinfo *tinfo 
2750                 = ahc_fetch_transinfo(ahc,
2751                                       starget->channel + 'A',
2752                                       shost->this_id, starget->id, &tstate);
2753         struct ahc_devinfo devinfo;
2754         unsigned int ppr_options = tinfo->curr.ppr_options
2755                 & ~MSG_EXT_PPR_DT_REQ;
2756         unsigned int period = tinfo->curr.period;
2757         unsigned long flags;
2758         struct ahc_syncrate *syncrate;
2759
2760         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2761                             starget->channel + 'A', ROLE_INITIATOR);
2762         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2763         ahc_lock(ahc, &flags);
2764         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->curr.offset,
2765                          ppr_options, AHC_TRANS_GOAL, FALSE);
2766         ahc_unlock(ahc, &flags);
2767 }
2768
2769 static void ahc_linux_get_qas(struct scsi_target *starget)
2770 {
2771         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2772         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2773         struct ahc_tmode_tstate *tstate;
2774         struct ahc_initiator_tinfo *tinfo 
2775                 = ahc_fetch_transinfo(ahc,
2776                                       starget->channel + 'A',
2777                                       shost->this_id, starget->id, &tstate);
2778         spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ;
2779 }
2780
2781 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2782 {
2783         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2784         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2785         struct ahc_tmode_tstate *tstate;
2786         struct ahc_initiator_tinfo *tinfo 
2787                 = ahc_fetch_transinfo(ahc,
2788                                       starget->channel + 'A',
2789                                       shost->this_id, starget->id, &tstate);
2790         struct ahc_devinfo devinfo;
2791         unsigned int ppr_options = tinfo->curr.ppr_options
2792                 & ~MSG_EXT_PPR_QAS_REQ;
2793         unsigned int period = tinfo->curr.period;
2794         unsigned long flags;
2795         struct ahc_syncrate *syncrate;
2796
2797         if (qas)
2798                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2799
2800         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2801                             starget->channel + 'A', ROLE_INITIATOR);
2802         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2803         ahc_lock(ahc, &flags);
2804         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->curr.offset,
2805                          ppr_options, AHC_TRANS_GOAL, FALSE);
2806         ahc_unlock(ahc, &flags);
2807 }
2808
2809 static void ahc_linux_get_iu(struct scsi_target *starget)
2810 {
2811         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2812         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2813         struct ahc_tmode_tstate *tstate;
2814         struct ahc_initiator_tinfo *tinfo 
2815                 = ahc_fetch_transinfo(ahc,
2816                                       starget->channel + 'A',
2817                                       shost->this_id, starget->id, &tstate);
2818         spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ;
2819 }
2820
2821 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2822 {
2823         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2824         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2825         struct ahc_tmode_tstate *tstate;
2826         struct ahc_initiator_tinfo *tinfo 
2827                 = ahc_fetch_transinfo(ahc,
2828                                       starget->channel + 'A',
2829                                       shost->this_id, starget->id, &tstate);
2830         struct ahc_devinfo devinfo;
2831         unsigned int ppr_options = tinfo->curr.ppr_options
2832                 & ~MSG_EXT_PPR_IU_REQ;
2833         unsigned int period = tinfo->curr.period;
2834         unsigned long flags;
2835         struct ahc_syncrate *syncrate;
2836
2837         if (iu)
2838                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2839
2840         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2841                             starget->channel + 'A', ROLE_INITIATOR);
2842         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2843         ahc_lock(ahc, &flags);
2844         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->curr.offset,
2845                          ppr_options, AHC_TRANS_GOAL, FALSE);
2846         ahc_unlock(ahc, &flags);
2847 }
2848
2849 static struct spi_function_template ahc_linux_transport_functions = {
2850         .get_offset     = ahc_linux_get_offset,
2851         .set_offset     = ahc_linux_set_offset,
2852         .show_offset    = 1,
2853         .get_period     = ahc_linux_get_period,
2854         .set_period     = ahc_linux_set_period,
2855         .show_period    = 1,
2856         .get_width      = ahc_linux_get_width,
2857         .set_width      = ahc_linux_set_width,
2858         .show_width     = 1,
2859         .get_dt         = ahc_linux_get_dt,
2860         .set_dt         = ahc_linux_set_dt,
2861         .show_dt        = 1,
2862         .get_iu         = ahc_linux_get_iu,
2863         .set_iu         = ahc_linux_set_iu,
2864         .show_iu        = 1,
2865         .get_qas        = ahc_linux_get_qas,
2866         .set_qas        = ahc_linux_set_qas,
2867         .show_qas       = 1,
2868 };
2869
2870
2871
2872 static int __init
2873 ahc_linux_init(void)
2874 {
2875         ahc_linux_transport_template = spi_attach_transport(&ahc_linux_transport_functions);
2876         if (!ahc_linux_transport_template)
2877                 return -ENODEV;
2878         if (ahc_linux_detect(&aic7xxx_driver_template))
2879                 return 0;
2880         spi_release_transport(ahc_linux_transport_template);
2881         ahc_linux_exit();
2882         return -ENODEV;
2883 }
2884
2885 static void
2886 ahc_linux_exit(void)
2887 {
2888         ahc_linux_pci_exit();
2889         ahc_linux_eisa_exit();
2890         spi_release_transport(ahc_linux_transport_template);
2891 }
2892
2893 module_init(ahc_linux_init);
2894 module_exit(ahc_linux_exit);