[PATCH] aic7xxx_osm build fix
[linux-2.6.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         unsigned int target_offset;
649         unsigned long flags;
650         int retval = -ENOMEM;
651
652         target_offset = starget->id;
653         if (starget->channel != 0)
654                 target_offset += 8;
655
656         ahc = *((struct ahc_softc **)device->host->hostdata);
657         if (bootverbose)
658                 printf("%s: Slave Alloc %d\n", ahc_name(ahc), device->id);
659         ahc_lock(ahc, &flags);
660         targ = ahc->platform_data->targets[target_offset];
661         if (targ == NULL) {
662                 struct seeprom_config *sc;
663
664                 targ = ahc_linux_alloc_target(ahc, starget->channel,
665                                                 starget->id);
666                 sc = ahc->seep_config;
667                 if (targ == NULL)
668                         goto out;
669
670                 if (sc) {
671                         unsigned short scsirate;
672                         struct ahc_devinfo devinfo;
673                         struct ahc_initiator_tinfo *tinfo;
674                         struct ahc_tmode_tstate *tstate;
675                         char channel = starget->channel + 'A';
676                         unsigned int our_id = ahc->our_id;
677
678                         if (starget->channel)
679                                 our_id = ahc->our_id_b;
680
681                         if ((ahc->features & AHC_ULTRA2) != 0) {
682                                 scsirate = sc->device_flags[target_offset] & CFXFER;
683                         } else {
684                                 scsirate = (sc->device_flags[target_offset] & CFXFER) << 4;
685                                 if (sc->device_flags[target_offset] & CFSYNCH)
686                                         scsirate |= SOFS;
687                         }
688                         if (sc->device_flags[target_offset] & CFWIDEB) {
689                                 scsirate |= WIDEXFER;
690                                 spi_max_width(starget) = 1;
691                         } else
692                                 spi_max_width(starget) = 0;
693                         spi_min_period(starget) = 
694                                 ahc_find_period(ahc, scsirate, AHC_SYNCRATE_DT);
695                         tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
696                                                     targ->target, &tstate);
697                         ahc_compile_devinfo(&devinfo, our_id, targ->target,
698                                             CAM_LUN_WILDCARD, channel,
699                                             ROLE_INITIATOR);
700                         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
701                                          AHC_TRANS_GOAL, /*paused*/FALSE);
702                         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
703                                       AHC_TRANS_GOAL, /*paused*/FALSE);
704                 }
705                         
706         }
707         dev = targ->devices[device->lun];
708         if (dev == NULL) {
709                 dev = ahc_linux_alloc_device(ahc, targ, device->lun);
710                 if (dev == NULL)
711                         goto out;
712         }
713         retval = 0;
714
715  out:
716         ahc_unlock(ahc, &flags);
717         return retval;
718 }
719
720 static int
721 ahc_linux_slave_configure(struct scsi_device *device)
722 {
723         struct  ahc_softc *ahc;
724         struct  ahc_linux_device *dev;
725
726         ahc = *((struct ahc_softc **)device->host->hostdata);
727
728         if (bootverbose)
729                 printf("%s: Slave Configure %d\n", ahc_name(ahc), device->id);
730
731         dev = ahc_linux_get_device(ahc, device->channel, device->id,
732                                    device->lun);
733         dev->scsi_device = device;
734         ahc_linux_device_queue_depth(ahc, dev);
735
736         /* Initial Domain Validation */
737         if (!spi_initial_dv(device->sdev_target))
738                 spi_dv_device(device);
739
740         return 0;
741 }
742
743 static void
744 ahc_linux_slave_destroy(struct scsi_device *device)
745 {
746         struct  ahc_softc *ahc;
747         struct  ahc_linux_device *dev;
748
749         ahc = *((struct ahc_softc **)device->host->hostdata);
750         if (bootverbose)
751                 printf("%s: Slave Destroy %d\n", ahc_name(ahc), device->id);
752         dev = ahc_linux_get_device(ahc, device->channel,
753                                    device->id, device->lun);
754
755         BUG_ON(dev->active);
756
757         ahc_linux_free_device(ahc, dev);
758 }
759
760 #if defined(__i386__)
761 /*
762  * Return the disk geometry for the given SCSI device.
763  */
764 static int
765 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
766                     sector_t capacity, int geom[])
767 {
768         uint8_t *bh;
769         int      heads;
770         int      sectors;
771         int      cylinders;
772         int      ret;
773         int      extended;
774         struct   ahc_softc *ahc;
775         u_int    channel;
776
777         ahc = *((struct ahc_softc **)sdev->host->hostdata);
778         channel = sdev->channel;
779
780         bh = scsi_bios_ptable(bdev);
781         if (bh) {
782                 ret = scsi_partsize(bh, capacity,
783                                     &geom[2], &geom[0], &geom[1]);
784                 kfree(bh);
785                 if (ret != -1)
786                         return (ret);
787         }
788         heads = 64;
789         sectors = 32;
790         cylinders = aic_sector_div(capacity, heads, sectors);
791
792         if (aic7xxx_extended != 0)
793                 extended = 1;
794         else if (channel == 0)
795                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
796         else
797                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
798         if (extended && cylinders >= 1024) {
799                 heads = 255;
800                 sectors = 63;
801                 cylinders = aic_sector_div(capacity, heads, sectors);
802         }
803         geom[0] = heads;
804         geom[1] = sectors;
805         geom[2] = cylinders;
806         return (0);
807 }
808 #endif
809
810 /*
811  * Abort the current SCSI command(s).
812  */
813 static int
814 ahc_linux_abort(struct scsi_cmnd *cmd)
815 {
816         int error;
817
818         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
819         if (error != 0)
820                 printf("aic7xxx_abort returns 0x%x\n", error);
821         return (error);
822 }
823
824 /*
825  * Attempt to send a target reset message to the device that timed out.
826  */
827 static int
828 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
829 {
830         int error;
831
832         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
833         if (error != 0)
834                 printf("aic7xxx_dev_reset returns 0x%x\n", error);
835         return (error);
836 }
837
838 /*
839  * Reset the SCSI bus.
840  */
841 static int
842 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
843 {
844         struct ahc_softc *ahc;
845         int    found;
846
847         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
848         found = ahc_reset_channel(ahc, cmd->device->channel + 'A',
849                                   /*initiate reset*/TRUE);
850
851         if (bootverbose)
852                 printf("%s: SCSI bus reset delivered. "
853                        "%d SCBs aborted.\n", ahc_name(ahc), found);
854
855         return SUCCESS;
856 }
857
858 struct scsi_host_template aic7xxx_driver_template = {
859         .module                 = THIS_MODULE,
860         .name                   = "aic7xxx",
861         .proc_info              = ahc_linux_proc_info,
862         .info                   = ahc_linux_info,
863         .queuecommand           = ahc_linux_queue,
864         .eh_abort_handler       = ahc_linux_abort,
865         .eh_device_reset_handler = ahc_linux_dev_reset,
866         .eh_bus_reset_handler   = ahc_linux_bus_reset,
867 #if defined(__i386__)
868         .bios_param             = ahc_linux_biosparam,
869 #endif
870         .can_queue              = AHC_MAX_QUEUE,
871         .this_id                = -1,
872         .cmd_per_lun            = 2,
873         .use_clustering         = ENABLE_CLUSTERING,
874         .slave_alloc            = ahc_linux_slave_alloc,
875         .slave_configure        = ahc_linux_slave_configure,
876         .slave_destroy          = ahc_linux_slave_destroy,
877 };
878
879 /**************************** Tasklet Handler *********************************/
880
881 /******************************** Macros **************************************/
882 #define BUILD_SCSIID(ahc, cmd)                                              \
883         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
884         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
885         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
886
887 /******************************** Bus DMA *************************************/
888 int
889 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
890                    bus_size_t alignment, bus_size_t boundary,
891                    dma_addr_t lowaddr, dma_addr_t highaddr,
892                    bus_dma_filter_t *filter, void *filterarg,
893                    bus_size_t maxsize, int nsegments,
894                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
895 {
896         bus_dma_tag_t dmat;
897
898         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
899         if (dmat == NULL)
900                 return (ENOMEM);
901
902         /*
903          * Linux is very simplistic about DMA memory.  For now don't
904          * maintain all specification information.  Once Linux supplies
905          * better facilities for doing these operations, or the
906          * needs of this particular driver change, we might need to do
907          * more here.
908          */
909         dmat->alignment = alignment;
910         dmat->boundary = boundary;
911         dmat->maxsize = maxsize;
912         *ret_tag = dmat;
913         return (0);
914 }
915
916 void
917 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
918 {
919         free(dmat, M_DEVBUF);
920 }
921
922 int
923 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
924                  int flags, bus_dmamap_t *mapp)
925 {
926         *vaddr = pci_alloc_consistent(ahc->dev_softc,
927                                       dmat->maxsize, mapp);
928         if (*vaddr == NULL)
929                 return ENOMEM;
930         return 0;
931 }
932
933 void
934 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
935                 void* vaddr, bus_dmamap_t map)
936 {
937         pci_free_consistent(ahc->dev_softc, dmat->maxsize,
938                             vaddr, map);
939 }
940
941 int
942 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
943                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
944                 void *cb_arg, int flags)
945 {
946         /*
947          * Assume for now that this will only be used during
948          * initialization and not for per-transaction buffer mapping.
949          */
950         bus_dma_segment_t stack_sg;
951
952         stack_sg.ds_addr = map;
953         stack_sg.ds_len = dmat->maxsize;
954         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
955         return (0);
956 }
957
958 void
959 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
960 {
961 }
962
963 int
964 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
965 {
966         /* Nothing to do */
967         return (0);
968 }
969
970 /********************* Platform Dependent Functions ***************************/
971 /*
972  * Compare "left hand" softc with "right hand" softc, returning:
973  * < 0 - lahc has a lower priority than rahc
974  *   0 - Softcs are equal
975  * > 0 - lahc has a higher priority than rahc
976  */
977 int
978 ahc_softc_comp(struct ahc_softc *lahc, struct ahc_softc *rahc)
979 {
980         int     value;
981         int     rvalue;
982         int     lvalue;
983
984         /*
985          * Under Linux, cards are ordered as follows:
986          *      1) VLB/EISA BIOS enabled devices sorted by BIOS address.
987          *      2) PCI devices with BIOS enabled sorted by bus/slot/func.
988          *      3) All remaining VLB/EISA devices sorted by ioport.
989          *      4) All remaining PCI devices sorted by bus/slot/func.
990          */
991         value = (lahc->flags & AHC_BIOS_ENABLED)
992               - (rahc->flags & AHC_BIOS_ENABLED);
993         if (value != 0)
994                 /* Controllers with BIOS enabled have a *higher* priority */
995                 return (value);
996
997         /*
998          * Same BIOS setting, now sort based on bus type.
999          * EISA and VL controllers sort together.  EISA/VL
1000          * have higher priority than PCI.
1001          */
1002         rvalue = (rahc->chip & AHC_BUS_MASK);
1003         if (rvalue == AHC_VL)
1004                 rvalue = AHC_EISA;
1005         lvalue = (lahc->chip & AHC_BUS_MASK);
1006         if (lvalue == AHC_VL)
1007                 lvalue = AHC_EISA;
1008         value = rvalue - lvalue;
1009         if (value != 0)
1010                 return (value);
1011
1012         /* Still equal.  Sort by BIOS address, ioport, or bus/slot/func. */
1013         switch (rvalue) {
1014 #ifdef CONFIG_PCI
1015         case AHC_PCI:
1016         {
1017                 char primary_channel;
1018
1019                 if (aic7xxx_reverse_scan != 0)
1020                         value = ahc_get_pci_bus(lahc->dev_softc)
1021                               - ahc_get_pci_bus(rahc->dev_softc);
1022                 else
1023                         value = ahc_get_pci_bus(rahc->dev_softc)
1024                               - ahc_get_pci_bus(lahc->dev_softc);
1025                 if (value != 0)
1026                         break;
1027                 if (aic7xxx_reverse_scan != 0)
1028                         value = ahc_get_pci_slot(lahc->dev_softc)
1029                               - ahc_get_pci_slot(rahc->dev_softc);
1030                 else
1031                         value = ahc_get_pci_slot(rahc->dev_softc)
1032                               - ahc_get_pci_slot(lahc->dev_softc);
1033                 if (value != 0)
1034                         break;
1035                 /*
1036                  * On multi-function devices, the user can choose
1037                  * to have function 1 probed before function 0.
1038                  * Give whichever channel is the primary channel
1039                  * the highest priority.
1040                  */
1041                 primary_channel = (lahc->flags & AHC_PRIMARY_CHANNEL) + 'A';
1042                 value = -1;
1043                 if (lahc->channel == primary_channel)
1044                         value = 1;
1045                 break;
1046         }
1047 #endif
1048         case AHC_EISA:
1049                 if ((rahc->flags & AHC_BIOS_ENABLED) != 0) {
1050                         value = rahc->platform_data->bios_address
1051                               - lahc->platform_data->bios_address; 
1052                 } else {
1053                         value = rahc->bsh.ioport
1054                               - lahc->bsh.ioport; 
1055                 }
1056                 break;
1057         default:
1058                 panic("ahc_softc_sort: invalid bus type");
1059         }
1060         return (value);
1061 }
1062
1063 static void
1064 ahc_linux_setup_tag_info_global(char *p)
1065 {
1066         int tags, i, j;
1067
1068         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
1069         printf("Setting Global Tags= %d\n", tags);
1070
1071         for (i = 0; i < NUM_ELEMENTS(aic7xxx_tag_info); i++) {
1072                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
1073                         aic7xxx_tag_info[i].tag_commands[j] = tags;
1074                 }
1075         }
1076 }
1077
1078 static void
1079 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
1080 {
1081
1082         if ((instance >= 0) && (targ >= 0)
1083          && (instance < NUM_ELEMENTS(aic7xxx_tag_info))
1084          && (targ < AHC_NUM_TARGETS)) {
1085                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
1086                 if (bootverbose)
1087                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
1088         }
1089 }
1090
1091 /*
1092  * Handle Linux boot parameters. This routine allows for assigning a value
1093  * to a parameter with a ':' between the parameter and the value.
1094  * ie. aic7xxx=stpwlev:1,extended
1095  */
1096 static int
1097 aic7xxx_setup(char *s)
1098 {
1099         int     i, n;
1100         char   *p;
1101         char   *end;
1102
1103         static struct {
1104                 const char *name;
1105                 uint32_t *flag;
1106         } options[] = {
1107                 { "extended", &aic7xxx_extended },
1108                 { "no_reset", &aic7xxx_no_reset },
1109                 { "verbose", &aic7xxx_verbose },
1110                 { "allow_memio", &aic7xxx_allow_memio},
1111 #ifdef AHC_DEBUG
1112                 { "debug", &ahc_debug },
1113 #endif
1114                 { "reverse_scan", &aic7xxx_reverse_scan },
1115                 { "no_probe", &aic7xxx_probe_eisa_vl },
1116                 { "probe_eisa_vl", &aic7xxx_probe_eisa_vl },
1117                 { "periodic_otag", &aic7xxx_periodic_otag },
1118                 { "pci_parity", &aic7xxx_pci_parity },
1119                 { "seltime", &aic7xxx_seltime },
1120                 { "tag_info", NULL },
1121                 { "global_tag_depth", NULL },
1122                 { "dv", NULL }
1123         };
1124
1125         end = strchr(s, '\0');
1126
1127         /*
1128          * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS
1129          * will never be 0 in this case.
1130          */
1131         n = 0;
1132
1133         while ((p = strsep(&s, ",.")) != NULL) {
1134                 if (*p == '\0')
1135                         continue;
1136                 for (i = 0; i < NUM_ELEMENTS(options); i++) {
1137
1138                         n = strlen(options[i].name);
1139                         if (strncmp(options[i].name, p, n) == 0)
1140                                 break;
1141                 }
1142                 if (i == NUM_ELEMENTS(options))
1143                         continue;
1144
1145                 if (strncmp(p, "global_tag_depth", n) == 0) {
1146                         ahc_linux_setup_tag_info_global(p + n);
1147                 } else if (strncmp(p, "tag_info", n) == 0) {
1148                         s = aic_parse_brace_option("tag_info", p + n, end,
1149                             2, ahc_linux_setup_tag_info, 0);
1150                 } else if (p[n] == ':') {
1151                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1152                 } else if (strncmp(p, "verbose", n) == 0) {
1153                         *(options[i].flag) = 1;
1154                 } else {
1155                         *(options[i].flag) ^= 0xFFFFFFFF;
1156                 }
1157         }
1158         return 1;
1159 }
1160
1161 __setup("aic7xxx=", aic7xxx_setup);
1162
1163 uint32_t aic7xxx_verbose;
1164
1165 int
1166 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1167 {
1168         char     buf[80];
1169         struct   Scsi_Host *host;
1170         char    *new_name;
1171         u_long   s;
1172
1173         template->name = ahc->description;
1174         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1175         if (host == NULL)
1176                 return (ENOMEM);
1177
1178         *((struct ahc_softc **)host->hostdata) = ahc;
1179         ahc_lock(ahc, &s);
1180         scsi_assign_lock(host, &ahc->platform_data->spin_lock);
1181         ahc->platform_data->host = host;
1182         host->can_queue = AHC_MAX_QUEUE;
1183         host->cmd_per_lun = 2;
1184         /* XXX No way to communicate the ID for multiple channels */
1185         host->this_id = ahc->our_id;
1186         host->irq = ahc->platform_data->irq;
1187         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1188         host->max_lun = AHC_NUM_LUNS;
1189         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1190         host->sg_tablesize = AHC_NSEG;
1191         ahc_set_unit(ahc, ahc_linux_next_unit());
1192         sprintf(buf, "scsi%d", host->host_no);
1193         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1194         if (new_name != NULL) {
1195                 strcpy(new_name, buf);
1196                 ahc_set_name(ahc, new_name);
1197         }
1198         host->unique_id = ahc->unit;
1199         ahc_linux_initialize_scsi_bus(ahc);
1200         ahc_intr_enable(ahc, TRUE);
1201         ahc_unlock(ahc, &s);
1202
1203         host->transportt = ahc_linux_transport_template;
1204
1205         scsi_add_host(host, (ahc->dev_softc ? &ahc->dev_softc->dev : NULL)); /* XXX handle failure */
1206         scsi_scan_host(host);
1207         return (0);
1208 }
1209
1210 uint64_t
1211 ahc_linux_get_memsize(void)
1212 {
1213         struct sysinfo si;
1214
1215         si_meminfo(&si);
1216         return ((uint64_t)si.totalram << PAGE_SHIFT);
1217 }
1218
1219 /*
1220  * Find the smallest available unit number to use
1221  * for a new device.  We don't just use a static
1222  * count to handle the "repeated hot-(un)plug"
1223  * scenario.
1224  */
1225 static int
1226 ahc_linux_next_unit(void)
1227 {
1228         struct ahc_softc *ahc;
1229         int unit;
1230
1231         unit = 0;
1232 retry:
1233         TAILQ_FOREACH(ahc, &ahc_tailq, links) {
1234                 if (ahc->unit == unit) {
1235                         unit++;
1236                         goto retry;
1237                 }
1238         }
1239         return (unit);
1240 }
1241
1242 /*
1243  * Place the SCSI bus into a known state by either resetting it,
1244  * or forcing transfer negotiations on the next command to any
1245  * target.
1246  */
1247 void
1248 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1249 {
1250         int i;
1251         int numtarg;
1252
1253         i = 0;
1254         numtarg = 0;
1255
1256         if (aic7xxx_no_reset != 0)
1257                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1258
1259         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1260                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1261         else
1262                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1263
1264         if ((ahc->features & AHC_TWIN) != 0) {
1265
1266                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1267                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1268                 } else {
1269                         if (numtarg == 0)
1270                                 i = 8;
1271                         numtarg += 8;
1272                 }
1273         }
1274
1275         /*
1276          * Force negotiation to async for all targets that
1277          * will not see an initial bus reset.
1278          */
1279         for (; i < numtarg; i++) {
1280                 struct ahc_devinfo devinfo;
1281                 struct ahc_initiator_tinfo *tinfo;
1282                 struct ahc_tmode_tstate *tstate;
1283                 u_int our_id;
1284                 u_int target_id;
1285                 char channel;
1286
1287                 channel = 'A';
1288                 our_id = ahc->our_id;
1289                 target_id = i;
1290                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1291                         channel = 'B';
1292                         our_id = ahc->our_id_b;
1293                         target_id = i % 8;
1294                 }
1295                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1296                                             target_id, &tstate);
1297                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1298                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1299                 ahc_update_neg_request(ahc, &devinfo, tstate,
1300                                        tinfo, AHC_NEG_ALWAYS);
1301         }
1302         /* Give the bus some time to recover */
1303         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1304                 ahc_linux_freeze_simq(ahc);
1305                 init_timer(&ahc->platform_data->reset_timer);
1306                 ahc->platform_data->reset_timer.data = (u_long)ahc;
1307                 ahc->platform_data->reset_timer.expires =
1308                     jiffies + (AIC7XXX_RESET_DELAY * HZ)/1000;
1309                 ahc->platform_data->reset_timer.function =
1310                     ahc_linux_release_simq;
1311                 add_timer(&ahc->platform_data->reset_timer);
1312         }
1313 }
1314
1315 int
1316 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1317 {
1318
1319         ahc->platform_data =
1320             malloc(sizeof(struct ahc_platform_data), M_DEVBUF, M_NOWAIT);
1321         if (ahc->platform_data == NULL)
1322                 return (ENOMEM);
1323         memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data));
1324         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1325         ahc_lockinit(ahc);
1326         init_MUTEX_LOCKED(&ahc->platform_data->eh_sem);
1327         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1328         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1329         if (aic7xxx_pci_parity == 0)
1330                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1331
1332         return (0);
1333 }
1334
1335 void
1336 ahc_platform_free(struct ahc_softc *ahc)
1337 {
1338         struct ahc_linux_target *targ;
1339         struct ahc_linux_device *dev;
1340         int i, j;
1341
1342         if (ahc->platform_data != NULL) {
1343                 if (ahc->platform_data->host != NULL) {
1344                         scsi_remove_host(ahc->platform_data->host);
1345                         scsi_host_put(ahc->platform_data->host);
1346                 }
1347
1348                 /* destroy all of the device and target objects */
1349                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1350                         targ = ahc->platform_data->targets[i];
1351                         if (targ != NULL) {
1352                                 /* Keep target around through the loop. */
1353                                 targ->refcount++;
1354                                 for (j = 0; j < AHC_NUM_LUNS; j++) {
1355
1356                                         if (targ->devices[j] == NULL)
1357                                                 continue;
1358                                         dev = targ->devices[j];
1359                                         ahc_linux_free_device(ahc, dev);
1360                                 }
1361                                 /*
1362                                  * Forcibly free the target now that
1363                                  * all devices are gone.
1364                                  */
1365                                 ahc_linux_free_target(ahc, targ);
1366                         }
1367                 }
1368
1369                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1370                         free_irq(ahc->platform_data->irq, ahc);
1371                 if (ahc->tag == BUS_SPACE_PIO
1372                  && ahc->bsh.ioport != 0)
1373                         release_region(ahc->bsh.ioport, 256);
1374                 if (ahc->tag == BUS_SPACE_MEMIO
1375                  && ahc->bsh.maddr != NULL) {
1376                         iounmap(ahc->bsh.maddr);
1377                         release_mem_region(ahc->platform_data->mem_busaddr,
1378                                            0x1000);
1379                 }
1380
1381                 free(ahc->platform_data, M_DEVBUF);
1382         }
1383 }
1384
1385 void
1386 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1387 {
1388         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1389                                 SCB_GET_CHANNEL(ahc, scb),
1390                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1391                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1392 }
1393
1394 void
1395 ahc_platform_set_tags(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
1396                       ahc_queue_alg alg)
1397 {
1398         struct ahc_linux_device *dev;
1399         int was_queuing;
1400         int now_queuing;
1401
1402         dev = ahc_linux_get_device(ahc, devinfo->channel - 'A',
1403                                    devinfo->target,
1404                                    devinfo->lun);
1405         if (dev == NULL)
1406                 return;
1407         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1408         switch (alg) {
1409         default:
1410         case AHC_QUEUE_NONE:
1411                 now_queuing = 0;
1412                 break; 
1413         case AHC_QUEUE_BASIC:
1414                 now_queuing = AHC_DEV_Q_BASIC;
1415                 break;
1416         case AHC_QUEUE_TAGGED:
1417                 now_queuing = AHC_DEV_Q_TAGGED;
1418                 break;
1419         }
1420         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1421          && (was_queuing != now_queuing)
1422          && (dev->active != 0)) {
1423                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1424                 dev->qfrozen++;
1425         }
1426
1427         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1428         if (now_queuing) {
1429                 u_int usertags;
1430
1431                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1432                 if (!was_queuing) {
1433                         /*
1434                          * Start out agressively and allow our
1435                          * dynamic queue depth algorithm to take
1436                          * care of the rest.
1437                          */
1438                         dev->maxtags = usertags;
1439                         dev->openings = dev->maxtags - dev->active;
1440                 }
1441                 if (dev->maxtags == 0) {
1442                         /*
1443                          * Queueing is disabled by the user.
1444                          */
1445                         dev->openings = 1;
1446                 } else if (alg == AHC_QUEUE_TAGGED) {
1447                         dev->flags |= AHC_DEV_Q_TAGGED;
1448                         if (aic7xxx_periodic_otag != 0)
1449                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1450                 } else
1451                         dev->flags |= AHC_DEV_Q_BASIC;
1452         } else {
1453                 /* We can only have one opening. */
1454                 dev->maxtags = 0;
1455                 dev->openings =  1 - dev->active;
1456         }
1457         if (dev->scsi_device != NULL) {
1458                 switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1459                 case AHC_DEV_Q_BASIC:
1460                         scsi_adjust_queue_depth(dev->scsi_device,
1461                                                 MSG_SIMPLE_TASK,
1462                                                 dev->openings + dev->active);
1463                         break;
1464                 case AHC_DEV_Q_TAGGED:
1465                         scsi_adjust_queue_depth(dev->scsi_device,
1466                                                 MSG_ORDERED_TASK,
1467                                                 dev->openings + dev->active);
1468                         break;
1469                 default:
1470                         /*
1471                          * We allow the OS to queue 2 untagged transactions to
1472                          * us at any time even though we can only execute them
1473                          * serially on the controller/device.  This should
1474                          * remove some latency.
1475                          */
1476                         scsi_adjust_queue_depth(dev->scsi_device,
1477                                                 /*NON-TAGGED*/0,
1478                                                 /*queue depth*/2);
1479                         break;
1480                 }
1481         }
1482 }
1483
1484 int
1485 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1486                         int lun, u_int tag, role_t role, uint32_t status)
1487 {
1488         return 0;
1489 }
1490
1491 static u_int
1492 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1493 {
1494         static int warned_user;
1495         u_int tags;
1496
1497         tags = 0;
1498         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1499                 if (ahc->unit >= NUM_ELEMENTS(aic7xxx_tag_info)) {
1500                         if (warned_user == 0) {
1501
1502                                 printf(KERN_WARNING
1503 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1504 "aic7xxx: for installed controllers. Using defaults\n"
1505 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1506 "aic7xxx: the aic7xxx_osm..c source file.\n");
1507                                 warned_user++;
1508                         }
1509                         tags = AHC_MAX_QUEUE;
1510                 } else {
1511                         adapter_tag_info_t *tag_info;
1512
1513                         tag_info = &aic7xxx_tag_info[ahc->unit];
1514                         tags = tag_info->tag_commands[devinfo->target_offset];
1515                         if (tags > AHC_MAX_QUEUE)
1516                                 tags = AHC_MAX_QUEUE;
1517                 }
1518         }
1519         return (tags);
1520 }
1521
1522 /*
1523  * Determines the queue depth for a given device.
1524  */
1525 static void
1526 ahc_linux_device_queue_depth(struct ahc_softc *ahc,
1527                              struct ahc_linux_device *dev)
1528 {
1529         struct  ahc_devinfo devinfo;
1530         u_int   tags;
1531
1532         ahc_compile_devinfo(&devinfo,
1533                             dev->target->channel == 0
1534                           ? ahc->our_id : ahc->our_id_b,
1535                             dev->target->target, dev->lun,
1536                             dev->target->channel == 0 ? 'A' : 'B',
1537                             ROLE_INITIATOR);
1538         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1539         if (tags != 0
1540          && dev->scsi_device != NULL
1541          && dev->scsi_device->tagged_supported != 0) {
1542
1543                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_TAGGED);
1544                 ahc_print_devinfo(ahc, &devinfo);
1545                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1546         } else {
1547                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_NONE);
1548         }
1549 }
1550
1551 static int
1552 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1553                       struct scsi_cmnd *cmd)
1554 {
1555         struct   scb *scb;
1556         struct   hardware_scb *hscb;
1557         struct   ahc_initiator_tinfo *tinfo;
1558         struct   ahc_tmode_tstate *tstate;
1559         uint16_t mask;
1560         struct scb_tailq *untagged_q = NULL;
1561
1562         /*
1563          * Schedule us to run later.  The only reason we are not
1564          * running is because the whole controller Q is frozen.
1565          */
1566         if (ahc->platform_data->qfrozen != 0)
1567                 return SCSI_MLQUEUE_HOST_BUSY;
1568
1569         /*
1570          * We only allow one untagged transaction
1571          * per target in the initiator role unless
1572          * we are storing a full busy target *lun*
1573          * table in SCB space.
1574          */
1575         if (!blk_rq_tagged(cmd->request)
1576             && (ahc->features & AHC_SCB_BTT) == 0) {
1577                 int target_offset;
1578
1579                 target_offset = cmd->device->id + cmd->device->channel * 8;
1580                 untagged_q = &(ahc->untagged_queues[target_offset]);
1581                 if (!TAILQ_EMPTY(untagged_q))
1582                         /* if we're already executing an untagged command
1583                          * we're busy to another */
1584                         return SCSI_MLQUEUE_DEVICE_BUSY;
1585         }
1586
1587         /*
1588          * Get an scb to use.
1589          */
1590         if ((scb = ahc_get_scb(ahc)) == NULL) {
1591                         ahc->flags |= AHC_RESOURCE_SHORTAGE;
1592                         return SCSI_MLQUEUE_HOST_BUSY;
1593         }
1594
1595         scb->io_ctx = cmd;
1596         scb->platform_data->dev = dev;
1597         hscb = scb->hscb;
1598         cmd->host_scribble = (char *)scb;
1599
1600         /*
1601          * Fill out basics of the HSCB.
1602          */
1603         hscb->control = 0;
1604         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1605         hscb->lun = cmd->device->lun;
1606         mask = SCB_GET_TARGET_MASK(ahc, scb);
1607         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1608                                     SCB_GET_OUR_ID(scb),
1609                                     SCB_GET_TARGET(ahc, scb), &tstate);
1610         hscb->scsirate = tinfo->scsirate;
1611         hscb->scsioffset = tinfo->curr.offset;
1612         if ((tstate->ultraenb & mask) != 0)
1613                 hscb->control |= ULTRAENB;
1614         
1615         if ((ahc->user_discenable & mask) != 0)
1616                 hscb->control |= DISCENB;
1617         
1618         if ((tstate->auto_negotiate & mask) != 0) {
1619                 scb->flags |= SCB_AUTO_NEGOTIATE;
1620                 scb->hscb->control |= MK_MESSAGE;
1621         }
1622
1623         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1624                 int     msg_bytes;
1625                 uint8_t tag_msgs[2];
1626                 
1627                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1628                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1629                         hscb->control |= tag_msgs[0];
1630                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1631                                 dev->commands_since_idle_or_otag = 0;
1632                 } else if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1633                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1634                         hscb->control |= MSG_ORDERED_TASK;
1635                         dev->commands_since_idle_or_otag = 0;
1636                 } else {
1637                         hscb->control |= MSG_SIMPLE_TASK;
1638                 }
1639         }
1640
1641         hscb->cdb_len = cmd->cmd_len;
1642         if (hscb->cdb_len <= 12) {
1643                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1644         } else {
1645                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1646                 scb->flags |= SCB_CDB32_PTR;
1647         }
1648
1649         scb->platform_data->xfer_len = 0;
1650         ahc_set_residual(scb, 0);
1651         ahc_set_sense_residual(scb, 0);
1652         scb->sg_count = 0;
1653         if (cmd->use_sg != 0) {
1654                 struct  ahc_dma_seg *sg;
1655                 struct  scatterlist *cur_seg;
1656                 struct  scatterlist *end_seg;
1657                 int     nseg;
1658
1659                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1660                 nseg = pci_map_sg(ahc->dev_softc, cur_seg, cmd->use_sg,
1661                                   cmd->sc_data_direction);
1662                 end_seg = cur_seg + nseg;
1663                 /* Copy the segments into the SG list. */
1664                 sg = scb->sg_list;
1665                 /*
1666                  * The sg_count may be larger than nseg if
1667                  * a transfer crosses a 32bit page.
1668                  */ 
1669                 while (cur_seg < end_seg) {
1670                         dma_addr_t addr;
1671                         bus_size_t len;
1672                         int consumed;
1673
1674                         addr = sg_dma_address(cur_seg);
1675                         len = sg_dma_len(cur_seg);
1676                         consumed = ahc_linux_map_seg(ahc, scb,
1677                                                      sg, addr, len);
1678                         sg += consumed;
1679                         scb->sg_count += consumed;
1680                         cur_seg++;
1681                 }
1682                 sg--;
1683                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1684
1685                 /*
1686                  * Reset the sg list pointer.
1687                  */
1688                 scb->hscb->sgptr =
1689                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1690                 
1691                 /*
1692                  * Copy the first SG into the "current"
1693                  * data pointer area.
1694                  */
1695                 scb->hscb->dataptr = scb->sg_list->addr;
1696                 scb->hscb->datacnt = scb->sg_list->len;
1697         } else if (cmd->request_bufflen != 0) {
1698                 struct   ahc_dma_seg *sg;
1699                 dma_addr_t addr;
1700
1701                 sg = scb->sg_list;
1702                 addr = pci_map_single(ahc->dev_softc,
1703                                       cmd->request_buffer,
1704                                       cmd->request_bufflen,
1705                                       cmd->sc_data_direction);
1706                 scb->platform_data->buf_busaddr = addr;
1707                 scb->sg_count = ahc_linux_map_seg(ahc, scb,
1708                                                   sg, addr,
1709                                                   cmd->request_bufflen);
1710                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1711
1712                 /*
1713                  * Reset the sg list pointer.
1714                  */
1715                 scb->hscb->sgptr =
1716                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1717
1718                 /*
1719                  * Copy the first SG into the "current"
1720                  * data pointer area.
1721                  */
1722                 scb->hscb->dataptr = sg->addr;
1723                 scb->hscb->datacnt = sg->len;
1724         } else {
1725                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1726                 scb->hscb->dataptr = 0;
1727                 scb->hscb->datacnt = 0;
1728                 scb->sg_count = 0;
1729         }
1730
1731         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1732         dev->openings--;
1733         dev->active++;
1734         dev->commands_issued++;
1735         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1736                 dev->commands_since_idle_or_otag++;
1737         
1738         scb->flags |= SCB_ACTIVE;
1739         if (untagged_q) {
1740                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1741                 scb->flags |= SCB_UNTAGGEDQ;
1742         }
1743         ahc_queue_scb(ahc, scb);
1744         return 0;
1745 }
1746
1747 /*
1748  * SCSI controller interrupt handler.
1749  */
1750 irqreturn_t
1751 ahc_linux_isr(int irq, void *dev_id, struct pt_regs * regs)
1752 {
1753         struct  ahc_softc *ahc;
1754         u_long  flags;
1755         int     ours;
1756
1757         ahc = (struct ahc_softc *) dev_id;
1758         ahc_lock(ahc, &flags); 
1759         ours = ahc_intr(ahc);
1760         ahc_unlock(ahc, &flags);
1761         return IRQ_RETVAL(ours);
1762 }
1763
1764 void
1765 ahc_platform_flushwork(struct ahc_softc *ahc)
1766 {
1767
1768 }
1769
1770 static struct ahc_linux_target*
1771 ahc_linux_alloc_target(struct ahc_softc *ahc, u_int channel, u_int target)
1772 {
1773         struct ahc_linux_target *targ;
1774         u_int target_offset;
1775
1776         target_offset = target;
1777         if (channel != 0)
1778                 target_offset += 8;
1779
1780         targ = malloc(sizeof(*targ), M_DEVBUG, M_NOWAIT);
1781         if (targ == NULL)
1782                 return (NULL);
1783         memset(targ, 0, sizeof(*targ));
1784         targ->channel = channel;
1785         targ->target = target;
1786         targ->ahc = ahc;
1787         ahc->platform_data->targets[target_offset] = targ;
1788         return (targ);
1789 }
1790
1791 static void
1792 ahc_linux_free_target(struct ahc_softc *ahc, struct ahc_linux_target *targ)
1793 {
1794         struct ahc_devinfo devinfo;
1795         struct ahc_initiator_tinfo *tinfo;
1796         struct ahc_tmode_tstate *tstate;
1797         u_int our_id;
1798         u_int target_offset;
1799         char channel;
1800
1801         /*
1802          * Force a negotiation to async/narrow on any
1803          * future command to this device unless a bus
1804          * reset occurs between now and that command.
1805          */
1806         channel = 'A' + targ->channel;
1807         our_id = ahc->our_id;
1808         target_offset = targ->target;
1809         if (targ->channel != 0) {
1810                 target_offset += 8;
1811                 our_id = ahc->our_id_b;
1812         }
1813         tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1814                                     targ->target, &tstate);
1815         ahc_compile_devinfo(&devinfo, our_id, targ->target, CAM_LUN_WILDCARD,
1816                             channel, ROLE_INITIATOR);
1817         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
1818                          AHC_TRANS_GOAL, /*paused*/FALSE);
1819         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
1820                       AHC_TRANS_GOAL, /*paused*/FALSE);
1821         ahc_update_neg_request(ahc, &devinfo, tstate, tinfo, AHC_NEG_ALWAYS);
1822         ahc->platform_data->targets[target_offset] = NULL;
1823         free(targ, M_DEVBUF);
1824 }
1825
1826 static struct ahc_linux_device*
1827 ahc_linux_alloc_device(struct ahc_softc *ahc,
1828                  struct ahc_linux_target *targ, u_int lun)
1829 {
1830         struct ahc_linux_device *dev;
1831
1832         dev = malloc(sizeof(*dev), M_DEVBUG, M_NOWAIT);
1833         if (dev == NULL)
1834                 return (NULL);
1835         memset(dev, 0, sizeof(*dev));
1836         dev->lun = lun;
1837         dev->target = targ;
1838
1839         /*
1840          * We start out life using untagged
1841          * transactions of which we allow one.
1842          */
1843         dev->openings = 1;
1844
1845         /*
1846          * Set maxtags to 0.  This will be changed if we
1847          * later determine that we are dealing with
1848          * a tagged queuing capable device.
1849          */
1850         dev->maxtags = 0;
1851         
1852         targ->refcount++;
1853         targ->devices[lun] = dev;
1854         return (dev);
1855 }
1856
1857 static void
1858 ahc_linux_free_device(struct ahc_softc *ahc, struct ahc_linux_device *dev)
1859 {
1860         struct ahc_linux_target *targ;
1861
1862         targ = dev->target;
1863         targ->devices[dev->lun] = NULL;
1864         free(dev, M_DEVBUF);
1865         targ->refcount--;
1866         if (targ->refcount == 0)
1867                 ahc_linux_free_target(ahc, targ);
1868 }
1869
1870 void
1871 ahc_send_async(struct ahc_softc *ahc, char channel,
1872                u_int target, u_int lun, ac_code code, void *arg)
1873 {
1874         switch (code) {
1875         case AC_TRANSFER_NEG:
1876         {
1877                 char    buf[80];
1878                 struct  ahc_linux_target *targ;
1879                 struct  info_str info;
1880                 struct  ahc_initiator_tinfo *tinfo;
1881                 struct  ahc_tmode_tstate *tstate;
1882                 int     target_offset;
1883
1884                 info.buffer = buf;
1885                 info.length = sizeof(buf);
1886                 info.offset = 0;
1887                 info.pos = 0;
1888                 tinfo = ahc_fetch_transinfo(ahc, channel,
1889                                                 channel == 'A' ? ahc->our_id
1890                                                                : ahc->our_id_b,
1891                                                 target, &tstate);
1892
1893                 /*
1894                  * Don't bother reporting results while
1895                  * negotiations are still pending.
1896                  */
1897                 if (tinfo->curr.period != tinfo->goal.period
1898                  || tinfo->curr.width != tinfo->goal.width
1899                  || tinfo->curr.offset != tinfo->goal.offset
1900                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1901                         if (bootverbose == 0)
1902                                 break;
1903
1904                 /*
1905                  * Don't bother reporting results that
1906                  * are identical to those last reported.
1907                  */
1908                 target_offset = target;
1909                 if (channel == 'B')
1910                         target_offset += 8;
1911                 targ = ahc->platform_data->targets[target_offset];
1912                 if (targ == NULL)
1913                         break;
1914                 if (tinfo->curr.period == targ->last_tinfo.period
1915                  && tinfo->curr.width == targ->last_tinfo.width
1916                  && tinfo->curr.offset == targ->last_tinfo.offset
1917                  && tinfo->curr.ppr_options == targ->last_tinfo.ppr_options)
1918                         if (bootverbose == 0)
1919                                 break;
1920
1921                 targ->last_tinfo.period = tinfo->curr.period;
1922                 targ->last_tinfo.width = tinfo->curr.width;
1923                 targ->last_tinfo.offset = tinfo->curr.offset;
1924                 targ->last_tinfo.ppr_options = tinfo->curr.ppr_options;
1925
1926                 printf("(%s:%c:", ahc_name(ahc), channel);
1927                 if (target == CAM_TARGET_WILDCARD)
1928                         printf("*): ");
1929                 else
1930                         printf("%d): ", target);
1931                 ahc_format_transinfo(&info, &tinfo->curr);
1932                 if (info.pos < info.length)
1933                         *info.buffer = '\0';
1934                 else
1935                         buf[info.length - 1] = '\0';
1936                 printf("%s", buf);
1937                 break;
1938         }
1939         case AC_SENT_BDR:
1940         {
1941                 WARN_ON(lun != CAM_LUN_WILDCARD);
1942                 scsi_report_device_reset(ahc->platform_data->host,
1943                                          channel - 'A', target);
1944                 break;
1945         }
1946         case AC_BUS_RESET:
1947                 if (ahc->platform_data->host != NULL) {
1948                         scsi_report_bus_reset(ahc->platform_data->host,
1949                                               channel - 'A');
1950                 }
1951                 break;
1952         default:
1953                 panic("ahc_send_async: Unexpected async event");
1954         }
1955 }
1956
1957 /*
1958  * Calls the higher level scsi done function and frees the scb.
1959  */
1960 void
1961 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1962 {
1963         struct scsi_cmnd *cmd;
1964         struct     ahc_linux_device *dev;
1965
1966         LIST_REMOVE(scb, pending_links);
1967         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1968                 struct scb_tailq *untagged_q;
1969                 int target_offset;
1970
1971                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1972                 untagged_q = &(ahc->untagged_queues[target_offset]);
1973                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1974                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1975         }
1976
1977         if ((scb->flags & SCB_ACTIVE) == 0) {
1978                 printf("SCB %d done'd twice\n", scb->hscb->tag);
1979                 ahc_dump_card_state(ahc);
1980                 panic("Stopping for safety");
1981         }
1982         cmd = scb->io_ctx;
1983         dev = scb->platform_data->dev;
1984         dev->active--;
1985         dev->openings++;
1986         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1987                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1988                 dev->qfrozen--;
1989         }
1990         ahc_linux_unmap_scb(ahc, scb);
1991
1992         /*
1993          * Guard against stale sense data.
1994          * The Linux mid-layer assumes that sense
1995          * was retrieved anytime the first byte of
1996          * the sense buffer looks "sane".
1997          */
1998         cmd->sense_buffer[0] = 0;
1999         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
2000                 uint32_t amount_xferred;
2001
2002                 amount_xferred =
2003                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
2004                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
2005 #ifdef AHC_DEBUG
2006                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
2007                                 ahc_print_path(ahc, scb);
2008                                 printf("Set CAM_UNCOR_PARITY\n");
2009                         }
2010 #endif
2011                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
2012 #ifdef AHC_REPORT_UNDERFLOWS
2013                 /*
2014                  * This code is disabled by default as some
2015                  * clients of the SCSI system do not properly
2016                  * initialize the underflow parameter.  This
2017                  * results in spurious termination of commands
2018                  * that complete as expected (e.g. underflow is
2019                  * allowed as command can return variable amounts
2020                  * of data.
2021                  */
2022                 } else if (amount_xferred < scb->io_ctx->underflow) {
2023                         u_int i;
2024
2025                         ahc_print_path(ahc, scb);
2026                         printf("CDB:");
2027                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
2028                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
2029                         printf("\n");
2030                         ahc_print_path(ahc, scb);
2031                         printf("Saw underflow (%ld of %ld bytes). "
2032                                "Treated as error\n",
2033                                 ahc_get_residual(scb),
2034                                 ahc_get_transfer_length(scb));
2035                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
2036 #endif
2037                 } else {
2038                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
2039                 }
2040         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
2041                 ahc_linux_handle_scsi_status(ahc, dev, scb);
2042         }
2043
2044         if (dev->openings == 1
2045          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
2046          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
2047                 dev->tag_success_count++;
2048         /*
2049          * Some devices deal with temporary internal resource
2050          * shortages by returning queue full.  When the queue
2051          * full occurrs, we throttle back.  Slowly try to get
2052          * back to our previous queue depth.
2053          */
2054         if ((dev->openings + dev->active) < dev->maxtags
2055          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
2056                 dev->tag_success_count = 0;
2057                 dev->openings++;
2058         }
2059
2060         if (dev->active == 0)
2061                 dev->commands_since_idle_or_otag = 0;
2062
2063         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
2064                 printf("Recovery SCB completes\n");
2065                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
2066                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
2067                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
2068                 if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
2069                         ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
2070                         up(&ahc->platform_data->eh_sem);
2071                 }
2072         }
2073
2074         ahc_free_scb(ahc, scb);
2075         ahc_linux_queue_cmd_complete(ahc, cmd);
2076 }
2077
2078 static void
2079 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
2080                              struct ahc_linux_device *dev, struct scb *scb)
2081 {
2082         struct  ahc_devinfo devinfo;
2083
2084         ahc_compile_devinfo(&devinfo,
2085                             ahc->our_id,
2086                             dev->target->target, dev->lun,
2087                             dev->target->channel == 0 ? 'A' : 'B',
2088                             ROLE_INITIATOR);
2089         
2090         /*
2091          * We don't currently trust the mid-layer to
2092          * properly deal with queue full or busy.  So,
2093          * when one occurs, we tell the mid-layer to
2094          * unconditionally requeue the command to us
2095          * so that we can retry it ourselves.  We also
2096          * implement our own throttling mechanism so
2097          * we don't clobber the device with too many
2098          * commands.
2099          */
2100         switch (ahc_get_scsi_status(scb)) {
2101         default:
2102                 break;
2103         case SCSI_STATUS_CHECK_COND:
2104         case SCSI_STATUS_CMD_TERMINATED:
2105         {
2106                 struct scsi_cmnd *cmd;
2107
2108                 /*
2109                  * Copy sense information to the OS's cmd
2110                  * structure if it is available.
2111                  */
2112                 cmd = scb->io_ctx;
2113                 if (scb->flags & SCB_SENSE) {
2114                         u_int sense_size;
2115
2116                         sense_size = MIN(sizeof(struct scsi_sense_data)
2117                                        - ahc_get_sense_residual(scb),
2118                                          sizeof(cmd->sense_buffer));
2119                         memcpy(cmd->sense_buffer,
2120                                ahc_get_sense_buf(ahc, scb), sense_size);
2121                         if (sense_size < sizeof(cmd->sense_buffer))
2122                                 memset(&cmd->sense_buffer[sense_size], 0,
2123                                        sizeof(cmd->sense_buffer) - sense_size);
2124                         cmd->result |= (DRIVER_SENSE << 24);
2125 #ifdef AHC_DEBUG
2126                         if (ahc_debug & AHC_SHOW_SENSE) {
2127                                 int i;
2128
2129                                 printf("Copied %d bytes of sense data:",
2130                                        sense_size);
2131                                 for (i = 0; i < sense_size; i++) {
2132                                         if ((i & 0xF) == 0)
2133                                                 printf("\n");
2134                                         printf("0x%x ", cmd->sense_buffer[i]);
2135                                 }
2136                                 printf("\n");
2137                         }
2138 #endif
2139                 }
2140                 break;
2141         }
2142         case SCSI_STATUS_QUEUE_FULL:
2143         {
2144                 /*
2145                  * By the time the core driver has returned this
2146                  * command, all other commands that were queued
2147                  * to us but not the device have been returned.
2148                  * This ensures that dev->active is equal to
2149                  * the number of commands actually queued to
2150                  * the device.
2151                  */
2152                 dev->tag_success_count = 0;
2153                 if (dev->active != 0) {
2154                         /*
2155                          * Drop our opening count to the number
2156                          * of commands currently outstanding.
2157                          */
2158                         dev->openings = 0;
2159 /*
2160                         ahc_print_path(ahc, scb);
2161                         printf("Dropping tag count to %d\n", dev->active);
2162  */
2163                         if (dev->active == dev->tags_on_last_queuefull) {
2164
2165                                 dev->last_queuefull_same_count++;
2166                                 /*
2167                                  * If we repeatedly see a queue full
2168                                  * at the same queue depth, this
2169                                  * device has a fixed number of tag
2170                                  * slots.  Lock in this tag depth
2171                                  * so we stop seeing queue fulls from
2172                                  * this device.
2173                                  */
2174                                 if (dev->last_queuefull_same_count
2175                                  == AHC_LOCK_TAGS_COUNT) {
2176                                         dev->maxtags = dev->active;
2177                                         ahc_print_path(ahc, scb);
2178                                         printf("Locking max tag count at %d\n",
2179                                                dev->active);
2180                                 }
2181                         } else {
2182                                 dev->tags_on_last_queuefull = dev->active;
2183                                 dev->last_queuefull_same_count = 0;
2184                         }
2185                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
2186                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
2187                         ahc_platform_set_tags(ahc, &devinfo,
2188                                      (dev->flags & AHC_DEV_Q_BASIC)
2189                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
2190                         break;
2191                 }
2192                 /*
2193                  * Drop down to a single opening, and treat this
2194                  * as if the target returned BUSY SCSI status.
2195                  */
2196                 dev->openings = 1;
2197                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
2198                 ahc_platform_set_tags(ahc, &devinfo,
2199                              (dev->flags & AHC_DEV_Q_BASIC)
2200                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
2201                 break;
2202         }
2203         }
2204 }
2205
2206 static void
2207 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
2208 {
2209         /*
2210          * Map CAM error codes into Linux Error codes.  We
2211          * avoid the conversion so that the DV code has the
2212          * full error information available when making
2213          * state change decisions.
2214          */
2215         {
2216                 u_int new_status;
2217
2218                 switch (ahc_cmd_get_transaction_status(cmd)) {
2219                 case CAM_REQ_INPROG:
2220                 case CAM_REQ_CMP:
2221                 case CAM_SCSI_STATUS_ERROR:
2222                         new_status = DID_OK;
2223                         break;
2224                 case CAM_REQ_ABORTED:
2225                         new_status = DID_ABORT;
2226                         break;
2227                 case CAM_BUSY:
2228                         new_status = DID_BUS_BUSY;
2229                         break;
2230                 case CAM_REQ_INVALID:
2231                 case CAM_PATH_INVALID:
2232                         new_status = DID_BAD_TARGET;
2233                         break;
2234                 case CAM_SEL_TIMEOUT:
2235                         new_status = DID_NO_CONNECT;
2236                         break;
2237                 case CAM_SCSI_BUS_RESET:
2238                 case CAM_BDR_SENT:
2239                         new_status = DID_RESET;
2240                         break;
2241                 case CAM_UNCOR_PARITY:
2242                         new_status = DID_PARITY;
2243                         break;
2244                 case CAM_CMD_TIMEOUT:
2245                         new_status = DID_TIME_OUT;
2246                         break;
2247                 case CAM_UA_ABORT:
2248                 case CAM_REQ_CMP_ERR:
2249                 case CAM_AUTOSENSE_FAIL:
2250                 case CAM_NO_HBA:
2251                 case CAM_DATA_RUN_ERR:
2252                 case CAM_UNEXP_BUSFREE:
2253                 case CAM_SEQUENCE_FAIL:
2254                 case CAM_CCB_LEN_ERR:
2255                 case CAM_PROVIDE_FAIL:
2256                 case CAM_REQ_TERMIO:
2257                 case CAM_UNREC_HBA_ERROR:
2258                 case CAM_REQ_TOO_BIG:
2259                         new_status = DID_ERROR;
2260                         break;
2261                 case CAM_REQUEUE_REQ:
2262                         new_status = DID_REQUEUE;
2263                         break;
2264                 default:
2265                         /* We should never get here */
2266                         new_status = DID_ERROR;
2267                         break;
2268                 }
2269
2270                 ahc_cmd_set_transaction_status(cmd, new_status);
2271         }
2272
2273         cmd->scsi_done(cmd);
2274 }
2275
2276 static void
2277 ahc_linux_sem_timeout(u_long arg)
2278 {
2279         struct  ahc_softc *ahc;
2280         u_long  s;
2281
2282         ahc = (struct ahc_softc *)arg;
2283
2284         ahc_lock(ahc, &s);
2285         if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
2286                 ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
2287                 up(&ahc->platform_data->eh_sem);
2288         }
2289         ahc_unlock(ahc, &s);
2290 }
2291
2292 static void
2293 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2294 {
2295         ahc->platform_data->qfrozen++;
2296         if (ahc->platform_data->qfrozen == 1) {
2297                 scsi_block_requests(ahc->platform_data->host);
2298
2299                 /* XXX What about Twin channels? */
2300                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2301                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2302                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2303         }
2304 }
2305
2306 static void
2307 ahc_linux_release_simq(u_long arg)
2308 {
2309         struct ahc_softc *ahc;
2310         u_long s;
2311         int    unblock_reqs;
2312
2313         ahc = (struct ahc_softc *)arg;
2314
2315         unblock_reqs = 0;
2316         ahc_lock(ahc, &s);
2317         if (ahc->platform_data->qfrozen > 0)
2318                 ahc->platform_data->qfrozen--;
2319         if (ahc->platform_data->qfrozen == 0)
2320                 unblock_reqs = 1;
2321         ahc_unlock(ahc, &s);
2322         /*
2323          * There is still a race here.  The mid-layer
2324          * should keep its own freeze count and use
2325          * a bottom half handler to run the queues
2326          * so we can unblock with our own lock held.
2327          */
2328         if (unblock_reqs)
2329                 scsi_unblock_requests(ahc->platform_data->host);
2330 }
2331
2332 static int
2333 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2334 {
2335         struct ahc_softc *ahc;
2336         struct ahc_linux_device *dev;
2337         struct scb *pending_scb;
2338         u_int  saved_scbptr;
2339         u_int  active_scb_index;
2340         u_int  last_phase;
2341         u_int  saved_scsiid;
2342         u_int  cdb_byte;
2343         int    retval;
2344         int    was_paused;
2345         int    paused;
2346         int    wait;
2347         int    disconnected;
2348
2349         pending_scb = NULL;
2350         paused = FALSE;
2351         wait = FALSE;
2352         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2353
2354         printf("%s:%d:%d:%d: Attempting to queue a%s message\n",
2355                ahc_name(ahc), cmd->device->channel,
2356                cmd->device->id, cmd->device->lun,
2357                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2358
2359         printf("CDB:");
2360         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2361                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2362         printf("\n");
2363
2364         /*
2365          * First determine if we currently own this command.
2366          * Start by searching the device queue.  If not found
2367          * there, check the pending_scb list.  If not found
2368          * at all, and the system wanted us to just abort the
2369          * command, return success.
2370          */
2371         dev = ahc_linux_get_device(ahc, cmd->device->channel, cmd->device->id,
2372                                    cmd->device->lun);
2373
2374         if (dev == NULL) {
2375                 /*
2376                  * No target device for this command exists,
2377                  * so we must not still own the command.
2378                  */
2379                 printf("%s:%d:%d:%d: Is not an active device\n",
2380                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2381                        cmd->device->lun);
2382                 retval = SUCCESS;
2383                 goto no_cmd;
2384         }
2385
2386         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2387          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2388                                        cmd->device->channel + 'A',
2389                                        cmd->device->lun,
2390                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2391                 printf("%s:%d:%d:%d: Command found on untagged queue\n",
2392                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2393                        cmd->device->lun);
2394                 retval = SUCCESS;
2395                 goto done;
2396         }
2397
2398         /*
2399          * See if we can find a matching cmd in the pending list.
2400          */
2401         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2402                 if (pending_scb->io_ctx == cmd)
2403                         break;
2404         }
2405
2406         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2407
2408                 /* Any SCB for this device will do for a target reset */
2409                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2410                         if (ahc_match_scb(ahc, pending_scb, cmd->device->id,
2411                                           cmd->device->channel + 'A',
2412                                           CAM_LUN_WILDCARD,
2413                                           SCB_LIST_NULL, ROLE_INITIATOR) == 0)
2414                                 break;
2415                 }
2416         }
2417
2418         if (pending_scb == NULL) {
2419                 printf("%s:%d:%d:%d: Command not found\n",
2420                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2421                        cmd->device->lun);
2422                 goto no_cmd;
2423         }
2424
2425         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2426                 /*
2427                  * We can't queue two recovery actions using the same SCB
2428                  */
2429                 retval = FAILED;
2430                 goto  done;
2431         }
2432
2433         /*
2434          * Ensure that the card doesn't do anything
2435          * behind our back and that we didn't "just" miss
2436          * an interrupt that would affect this cmd.
2437          */
2438         was_paused = ahc_is_paused(ahc);
2439         ahc_pause_and_flushwork(ahc);
2440         paused = TRUE;
2441
2442         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2443                 printf("%s:%d:%d:%d: Command already completed\n",
2444                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2445                        cmd->device->lun);
2446                 goto no_cmd;
2447         }
2448
2449         printf("%s: At time of recovery, card was %spaused\n",
2450                ahc_name(ahc), was_paused ? "" : "not ");
2451         ahc_dump_card_state(ahc);
2452
2453         disconnected = TRUE;
2454         if (flag == SCB_ABORT) {
2455                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2456                                        cmd->device->channel + 'A',
2457                                        cmd->device->lun,
2458                                        pending_scb->hscb->tag,
2459                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2460                                        SEARCH_COMPLETE) > 0) {
2461                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2462                                ahc_name(ahc), cmd->device->channel,
2463                                         cmd->device->id, cmd->device->lun);
2464                         retval = SUCCESS;
2465                         goto done;
2466                 }
2467         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2468                                       cmd->device->channel + 'A',
2469                                       cmd->device->lun, pending_scb->hscb->tag,
2470                                       ROLE_INITIATOR, /*status*/0,
2471                                       SEARCH_COUNT) > 0) {
2472                 disconnected = FALSE;
2473         }
2474
2475         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2476                 struct scb *bus_scb;
2477
2478                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2479                 if (bus_scb == pending_scb)
2480                         disconnected = FALSE;
2481                 else if (flag != SCB_ABORT
2482                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2483                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2484                         disconnected = FALSE;
2485         }
2486
2487         /*
2488          * At this point, pending_scb is the scb associated with the
2489          * passed in command.  That command is currently active on the
2490          * bus, is in the disconnected state, or we're hoping to find
2491          * a command for the same target active on the bus to abuse to
2492          * send a BDR.  Queue the appropriate message based on which of
2493          * these states we are in.
2494          */
2495         last_phase = ahc_inb(ahc, LASTPHASE);
2496         saved_scbptr = ahc_inb(ahc, SCBPTR);
2497         active_scb_index = ahc_inb(ahc, SCB_TAG);
2498         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2499         if (last_phase != P_BUSFREE
2500          && (pending_scb->hscb->tag == active_scb_index
2501           || (flag == SCB_DEVICE_RESET
2502            && SCSIID_TARGET(ahc, saved_scsiid) == cmd->device->id))) {
2503
2504                 /*
2505                  * We're active on the bus, so assert ATN
2506                  * and hope that the target responds.
2507                  */
2508                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2509                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2510                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2511                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2512                 printf("%s:%d:%d:%d: Device is active, asserting ATN\n",
2513                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2514                        cmd->device->lun);
2515                 wait = TRUE;
2516         } else if (disconnected) {
2517
2518                 /*
2519                  * Actually re-queue this SCB in an attempt
2520                  * to select the device before it reconnects.
2521                  * In either case (selection or reselection),
2522                  * we will now issue the approprate message
2523                  * to the timed-out device.
2524                  *
2525                  * Set the MK_MESSAGE control bit indicating
2526                  * that we desire to send a message.  We
2527                  * also set the disconnected flag since
2528                  * in the paging case there is no guarantee
2529                  * that our SCB control byte matches the
2530                  * version on the card.  We don't want the
2531                  * sequencer to abort the command thinking
2532                  * an unsolicited reselection occurred.
2533                  */
2534                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2535                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2536
2537                 /*
2538                  * Remove any cached copy of this SCB in the
2539                  * disconnected list in preparation for the
2540                  * queuing of our abort SCB.  We use the
2541                  * same element in the SCB, SCB_NEXT, for
2542                  * both the qinfifo and the disconnected list.
2543                  */
2544                 ahc_search_disc_list(ahc, cmd->device->id,
2545                                      cmd->device->channel + 'A',
2546                                      cmd->device->lun, pending_scb->hscb->tag,
2547                                      /*stop_on_first*/TRUE,
2548                                      /*remove*/TRUE,
2549                                      /*save_state*/FALSE);
2550
2551                 /*
2552                  * In the non-paging case, the sequencer will
2553                  * never re-reference the in-core SCB.
2554                  * To make sure we are notified during
2555                  * reslection, set the MK_MESSAGE flag in
2556                  * the card's copy of the SCB.
2557                  */
2558                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2559                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2560                         ahc_outb(ahc, SCB_CONTROL,
2561                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2562                 }
2563
2564                 /*
2565                  * Clear out any entries in the QINFIFO first
2566                  * so we are the next SCB for this target
2567                  * to run.
2568                  */
2569                 ahc_search_qinfifo(ahc, cmd->device->id,
2570                                    cmd->device->channel + 'A',
2571                                    cmd->device->lun, SCB_LIST_NULL,
2572                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2573                                    SEARCH_COMPLETE);
2574                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2575                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2576                 ahc_print_path(ahc, pending_scb);
2577                 printf("Device is disconnected, re-queuing SCB\n");
2578                 wait = TRUE;
2579         } else {
2580                 printf("%s:%d:%d:%d: Unable to deliver message\n",
2581                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2582                        cmd->device->lun);
2583                 retval = FAILED;
2584                 goto done;
2585         }
2586
2587 no_cmd:
2588         /*
2589          * Our assumption is that if we don't have the command, no
2590          * recovery action was required, so we return success.  Again,
2591          * the semantics of the mid-layer recovery engine are not
2592          * well defined, so this may change in time.
2593          */
2594         retval = SUCCESS;
2595 done:
2596         if (paused)
2597                 ahc_unpause(ahc);
2598         if (wait) {
2599                 struct timer_list timer;
2600                 int ret;
2601
2602                 ahc->platform_data->flags |= AHC_UP_EH_SEMAPHORE;
2603                 spin_unlock_irq(&ahc->platform_data->spin_lock);
2604                 init_timer(&timer);
2605                 timer.data = (u_long)ahc;
2606                 timer.expires = jiffies + (5 * HZ);
2607                 timer.function = ahc_linux_sem_timeout;
2608                 add_timer(&timer);
2609                 printf("Recovery code sleeping\n");
2610                 down(&ahc->platform_data->eh_sem);
2611                 printf("Recovery code awake\n");
2612                 ret = del_timer_sync(&timer);
2613                 if (ret == 0) {
2614                         printf("Timer Expired\n");
2615                         retval = FAILED;
2616                 }
2617                 spin_lock_irq(&ahc->platform_data->spin_lock);
2618         }
2619         return (retval);
2620 }
2621
2622 void
2623 ahc_platform_dump_card_state(struct ahc_softc *ahc)
2624 {
2625 }
2626
2627 static void ahc_linux_exit(void);
2628
2629 static void ahc_linux_get_width(struct scsi_target *starget)
2630 {
2631         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2632         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2633         struct ahc_tmode_tstate *tstate;
2634         struct ahc_initiator_tinfo *tinfo 
2635                 = ahc_fetch_transinfo(ahc,
2636                                       starget->channel + 'A',
2637                                       shost->this_id, starget->id, &tstate);
2638         spi_width(starget) = tinfo->curr.width;
2639 }
2640
2641 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2642 {
2643         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2644         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2645         struct ahc_devinfo devinfo;
2646         unsigned long flags;
2647
2648         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2649                             starget->channel + 'A', ROLE_INITIATOR);
2650         ahc_lock(ahc, &flags);
2651         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2652         ahc_unlock(ahc, &flags);
2653 }
2654
2655 static void ahc_linux_get_period(struct scsi_target *starget)
2656 {
2657         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2658         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2659         struct ahc_tmode_tstate *tstate;
2660         struct ahc_initiator_tinfo *tinfo 
2661                 = ahc_fetch_transinfo(ahc,
2662                                       starget->channel + 'A',
2663                                       shost->this_id, starget->id, &tstate);
2664         spi_period(starget) = tinfo->curr.period;
2665 }
2666
2667 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2668 {
2669         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2670         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2671         struct ahc_tmode_tstate *tstate;
2672         struct ahc_initiator_tinfo *tinfo 
2673                 = ahc_fetch_transinfo(ahc,
2674                                       starget->channel + 'A',
2675                                       shost->this_id, starget->id, &tstate);
2676         struct ahc_devinfo devinfo;
2677         unsigned int ppr_options = tinfo->curr.ppr_options;
2678         unsigned long flags;
2679         unsigned long offset = tinfo->curr.offset;
2680         struct ahc_syncrate *syncrate;
2681
2682         if (offset == 0)
2683                 offset = MAX_OFFSET;
2684
2685         if (period < 9)
2686                 period = 9;     /* 12.5ns is our minimum */
2687         if (period == 9)
2688                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2689
2690         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2691                             starget->channel + 'A', ROLE_INITIATOR);
2692
2693         /* all PPR requests apart from QAS require wide transfers */
2694         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2695                 ahc_linux_get_width(starget);
2696                 if (spi_width(starget) == 0)
2697                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2698         }
2699
2700         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2701         ahc_lock(ahc, &flags);
2702         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2703                          ppr_options, AHC_TRANS_GOAL, FALSE);
2704         ahc_unlock(ahc, &flags);
2705 }
2706
2707 static void ahc_linux_get_offset(struct scsi_target *starget)
2708 {
2709         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2710         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2711         struct ahc_tmode_tstate *tstate;
2712         struct ahc_initiator_tinfo *tinfo 
2713                 = ahc_fetch_transinfo(ahc,
2714                                       starget->channel + 'A',
2715                                       shost->this_id, starget->id, &tstate);
2716         spi_offset(starget) = tinfo->curr.offset;
2717 }
2718
2719 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2720 {
2721         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2722         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2723         struct ahc_tmode_tstate *tstate;
2724         struct ahc_initiator_tinfo *tinfo 
2725                 = ahc_fetch_transinfo(ahc,
2726                                       starget->channel + 'A',
2727                                       shost->this_id, starget->id, &tstate);
2728         struct ahc_devinfo devinfo;
2729         unsigned int ppr_options = 0;
2730         unsigned int period = 0;
2731         unsigned long flags;
2732         struct ahc_syncrate *syncrate = NULL;
2733
2734         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2735                             starget->channel + 'A', ROLE_INITIATOR);
2736         if (offset != 0) {
2737                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2738                 period = tinfo->curr.period;
2739                 ppr_options = tinfo->curr.ppr_options;
2740         }
2741         ahc_lock(ahc, &flags);
2742         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2743                          ppr_options, AHC_TRANS_GOAL, FALSE);
2744         ahc_unlock(ahc, &flags);
2745 }
2746
2747 static void ahc_linux_get_dt(struct scsi_target *starget)
2748 {
2749         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2750         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2751         struct ahc_tmode_tstate *tstate;
2752         struct ahc_initiator_tinfo *tinfo 
2753                 = ahc_fetch_transinfo(ahc,
2754                                       starget->channel + 'A',
2755                                       shost->this_id, starget->id, &tstate);
2756         spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ;
2757 }
2758
2759 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2760 {
2761         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2762         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2763         struct ahc_tmode_tstate *tstate;
2764         struct ahc_initiator_tinfo *tinfo 
2765                 = ahc_fetch_transinfo(ahc,
2766                                       starget->channel + 'A',
2767                                       shost->this_id, starget->id, &tstate);
2768         struct ahc_devinfo devinfo;
2769         unsigned int ppr_options = tinfo->curr.ppr_options
2770                 & ~MSG_EXT_PPR_DT_REQ;
2771         unsigned int period = tinfo->curr.period;
2772         unsigned long flags;
2773         struct ahc_syncrate *syncrate;
2774
2775         if (dt) {
2776                 period = 9;     /* 12.5ns is the only period valid for DT */
2777                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2778         } else if (period == 9)
2779                 period = 10;    /* if resetting DT, period must be >= 25ns */
2780
2781         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2782                             starget->channel + 'A', ROLE_INITIATOR);
2783         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2784         ahc_lock(ahc, &flags);
2785         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->curr.offset,
2786                          ppr_options, AHC_TRANS_GOAL, FALSE);
2787         ahc_unlock(ahc, &flags);
2788 }
2789
2790 static void ahc_linux_get_qas(struct scsi_target *starget)
2791 {
2792         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2793         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2794         struct ahc_tmode_tstate *tstate;
2795         struct ahc_initiator_tinfo *tinfo 
2796                 = ahc_fetch_transinfo(ahc,
2797                                       starget->channel + 'A',
2798                                       shost->this_id, starget->id, &tstate);
2799         spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ;
2800 }
2801
2802 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2803 {
2804         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2805         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2806         struct ahc_tmode_tstate *tstate;
2807         struct ahc_initiator_tinfo *tinfo 
2808                 = ahc_fetch_transinfo(ahc,
2809                                       starget->channel + 'A',
2810                                       shost->this_id, starget->id, &tstate);
2811         struct ahc_devinfo devinfo;
2812         unsigned int ppr_options = tinfo->curr.ppr_options
2813                 & ~MSG_EXT_PPR_QAS_REQ;
2814         unsigned int period = tinfo->curr.period;
2815         unsigned long flags;
2816         struct ahc_syncrate *syncrate;
2817
2818         if (qas)
2819                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2820
2821         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2822                             starget->channel + 'A', ROLE_INITIATOR);
2823         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2824         ahc_lock(ahc, &flags);
2825         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->curr.offset,
2826                          ppr_options, AHC_TRANS_GOAL, FALSE);
2827         ahc_unlock(ahc, &flags);
2828 }
2829
2830 static void ahc_linux_get_iu(struct scsi_target *starget)
2831 {
2832         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2833         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2834         struct ahc_tmode_tstate *tstate;
2835         struct ahc_initiator_tinfo *tinfo 
2836                 = ahc_fetch_transinfo(ahc,
2837                                       starget->channel + 'A',
2838                                       shost->this_id, starget->id, &tstate);
2839         spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ;
2840 }
2841
2842 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2843 {
2844         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2845         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2846         struct ahc_tmode_tstate *tstate;
2847         struct ahc_initiator_tinfo *tinfo 
2848                 = ahc_fetch_transinfo(ahc,
2849                                       starget->channel + 'A',
2850                                       shost->this_id, starget->id, &tstate);
2851         struct ahc_devinfo devinfo;
2852         unsigned int ppr_options = tinfo->curr.ppr_options
2853                 & ~MSG_EXT_PPR_IU_REQ;
2854         unsigned int period = tinfo->curr.period;
2855         unsigned long flags;
2856         struct ahc_syncrate *syncrate;
2857
2858         if (iu)
2859                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2860
2861         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2862                             starget->channel + 'A', ROLE_INITIATOR);
2863         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2864         ahc_lock(ahc, &flags);
2865         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->curr.offset,
2866                          ppr_options, AHC_TRANS_GOAL, FALSE);
2867         ahc_unlock(ahc, &flags);
2868 }
2869
2870 static struct spi_function_template ahc_linux_transport_functions = {
2871         .get_offset     = ahc_linux_get_offset,
2872         .set_offset     = ahc_linux_set_offset,
2873         .show_offset    = 1,
2874         .get_period     = ahc_linux_get_period,
2875         .set_period     = ahc_linux_set_period,
2876         .show_period    = 1,
2877         .get_width      = ahc_linux_get_width,
2878         .set_width      = ahc_linux_set_width,
2879         .show_width     = 1,
2880         .get_dt         = ahc_linux_get_dt,
2881         .set_dt         = ahc_linux_set_dt,
2882         .show_dt        = 1,
2883         .get_iu         = ahc_linux_get_iu,
2884         .set_iu         = ahc_linux_set_iu,
2885         .show_iu        = 1,
2886         .get_qas        = ahc_linux_get_qas,
2887         .set_qas        = ahc_linux_set_qas,
2888         .show_qas       = 1,
2889 };
2890
2891
2892
2893 static int __init
2894 ahc_linux_init(void)
2895 {
2896         ahc_linux_transport_template = spi_attach_transport(&ahc_linux_transport_functions);
2897         if (!ahc_linux_transport_template)
2898                 return -ENODEV;
2899         if (ahc_linux_detect(&aic7xxx_driver_template))
2900                 return 0;
2901         spi_release_transport(ahc_linux_transport_template);
2902         ahc_linux_exit();
2903         return -ENODEV;
2904 }
2905
2906 static void
2907 ahc_linux_exit(void)
2908 {
2909         ahc_linux_pci_exit();
2910         ahc_linux_eisa_exit();
2911         spi_release_transport(ahc_linux_transport_template);
2912 }
2913
2914 module_init(ahc_linux_init);
2915 module_exit(ahc_linux_exit);