Linux 2.6.12
[linux-2.6.git] / drivers / scsi / aic7xxx / aic79xx_osm.c
1 /*
2  * Adaptec AIC79xx device driver for Linux.
3  *
4  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic79xx_osm.c#171 $
5  *
6  * --------------------------------------------------------------------------
7  * Copyright (c) 1994-2000 Justin T. Gibbs.
8  * Copyright (c) 1997-1999 Doug Ledford
9  * Copyright (c) 2000-2003 Adaptec Inc.
10  * All rights reserved.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions, and the following disclaimer,
17  *    without modification.
18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19  *    substantially similar to the "NO WARRANTY" disclaimer below
20  *    ("Disclaimer") and any redistribution must be conditioned upon
21  *    including a substantially similar Disclaimer requirement for further
22  *    binary redistribution.
23  * 3. Neither the names of the above-listed copyright holders nor the names
24  *    of any contributors may be used to endorse or promote products derived
25  *    from this software without specific prior written permission.
26  *
27  * Alternatively, this software may be distributed under the terms of the
28  * GNU General Public License ("GPL") version 2 as published by the Free
29  * Software Foundation.
30  *
31  * NO WARRANTY
32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42  * POSSIBILITY OF SUCH DAMAGES.
43  */
44
45 #include "aic79xx_osm.h"
46 #include "aic79xx_inline.h"
47 #include <scsi/scsicam.h>
48
49 /*
50  * Include aiclib.c as part of our
51  * "module dependencies are hard" work around.
52  */
53 #include "aiclib.c"
54
55 #include <linux/init.h>         /* __setup */
56
57 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
58 #include "sd.h"                 /* For geometry detection */
59 #endif
60
61 #include <linux/mm.h>           /* For fetching system memory size */
62 #include <linux/delay.h>        /* For ssleep/msleep */
63
64 /*
65  * Lock protecting manipulation of the ahd softc list.
66  */
67 spinlock_t ahd_list_spinlock;
68
69 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
70 /* For dynamic sglist size calculation. */
71 u_int ahd_linux_nseg;
72 #endif
73
74 /*
75  * Bucket size for counting good commands in between bad ones.
76  */
77 #define AHD_LINUX_ERR_THRESH    1000
78
79 /*
80  * Set this to the delay in seconds after SCSI bus reset.
81  * Note, we honor this only for the initial bus reset.
82  * The scsi error recovery code performs its own bus settle
83  * delay handling for error recovery actions.
84  */
85 #ifdef CONFIG_AIC79XX_RESET_DELAY_MS
86 #define AIC79XX_RESET_DELAY CONFIG_AIC79XX_RESET_DELAY_MS
87 #else
88 #define AIC79XX_RESET_DELAY 5000
89 #endif
90
91 /*
92  * To change the default number of tagged transactions allowed per-device,
93  * add a line to the lilo.conf file like:
94  * append="aic79xx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
95  * which will result in the first four devices on the first two
96  * controllers being set to a tagged queue depth of 32.
97  *
98  * The tag_commands is an array of 16 to allow for wide and twin adapters.
99  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
100  * for channel 1.
101  */
102 typedef struct {
103         uint16_t tag_commands[16];      /* Allow for wide/twin adapters. */
104 } adapter_tag_info_t;
105
106 /*
107  * Modify this as you see fit for your system.
108  *
109  * 0                    tagged queuing disabled
110  * 1 <= n <= 253        n == max tags ever dispatched.
111  *
112  * The driver will throttle the number of commands dispatched to a
113  * device if it returns queue full.  For devices with a fixed maximum
114  * queue depth, the driver will eventually determine this depth and
115  * lock it in (a console message is printed to indicate that a lock
116  * has occurred).  On some devices, queue full is returned for a temporary
117  * resource shortage.  These devices will return queue full at varying
118  * depths.  The driver will throttle back when the queue fulls occur and
119  * attempt to slowly increase the depth over time as the device recovers
120  * from the resource shortage.
121  *
122  * In this example, the first line will disable tagged queueing for all
123  * the devices on the first probed aic79xx adapter.
124  *
125  * The second line enables tagged queueing with 4 commands/LUN for IDs
126  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
127  * driver to attempt to use up to 64 tags for ID 1.
128  *
129  * The third line is the same as the first line.
130  *
131  * The fourth line disables tagged queueing for devices 0 and 3.  It
132  * enables tagged queueing for the other IDs, with 16 commands/LUN
133  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
134  * IDs 2, 5-7, and 9-15.
135  */
136
137 /*
138  * NOTE: The below structure is for reference only, the actual structure
139  *       to modify in order to change things is just below this comment block.
140 adapter_tag_info_t aic79xx_tag_info[] =
141 {
142         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
143         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
144         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
145         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
146 };
147 */
148
149 #ifdef CONFIG_AIC79XX_CMDS_PER_DEVICE
150 #define AIC79XX_CMDS_PER_DEVICE CONFIG_AIC79XX_CMDS_PER_DEVICE
151 #else
152 #define AIC79XX_CMDS_PER_DEVICE AHD_MAX_QUEUE
153 #endif
154
155 #define AIC79XX_CONFIGED_TAG_COMMANDS {                                 \
156         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
157         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
158         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
159         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
160         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
161         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
162         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
163         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE                \
164 }
165
166 /*
167  * By default, use the number of commands specified by
168  * the users kernel configuration.
169  */
170 static adapter_tag_info_t aic79xx_tag_info[] =
171 {
172         {AIC79XX_CONFIGED_TAG_COMMANDS},
173         {AIC79XX_CONFIGED_TAG_COMMANDS},
174         {AIC79XX_CONFIGED_TAG_COMMANDS},
175         {AIC79XX_CONFIGED_TAG_COMMANDS},
176         {AIC79XX_CONFIGED_TAG_COMMANDS},
177         {AIC79XX_CONFIGED_TAG_COMMANDS},
178         {AIC79XX_CONFIGED_TAG_COMMANDS},
179         {AIC79XX_CONFIGED_TAG_COMMANDS},
180         {AIC79XX_CONFIGED_TAG_COMMANDS},
181         {AIC79XX_CONFIGED_TAG_COMMANDS},
182         {AIC79XX_CONFIGED_TAG_COMMANDS},
183         {AIC79XX_CONFIGED_TAG_COMMANDS},
184         {AIC79XX_CONFIGED_TAG_COMMANDS},
185         {AIC79XX_CONFIGED_TAG_COMMANDS},
186         {AIC79XX_CONFIGED_TAG_COMMANDS},
187         {AIC79XX_CONFIGED_TAG_COMMANDS}
188 };
189
190 /*
191  * By default, read streaming is disabled.  In theory,
192  * read streaming should enhance performance, but early
193  * U320 drive firmware actually performs slower with
194  * read streaming enabled.
195  */
196 #ifdef CONFIG_AIC79XX_ENABLE_RD_STRM
197 #define AIC79XX_CONFIGED_RD_STRM 0xFFFF
198 #else
199 #define AIC79XX_CONFIGED_RD_STRM 0
200 #endif
201
202 static uint16_t aic79xx_rd_strm_info[] =
203 {
204         AIC79XX_CONFIGED_RD_STRM,
205         AIC79XX_CONFIGED_RD_STRM,
206         AIC79XX_CONFIGED_RD_STRM,
207         AIC79XX_CONFIGED_RD_STRM,
208         AIC79XX_CONFIGED_RD_STRM,
209         AIC79XX_CONFIGED_RD_STRM,
210         AIC79XX_CONFIGED_RD_STRM,
211         AIC79XX_CONFIGED_RD_STRM,
212         AIC79XX_CONFIGED_RD_STRM,
213         AIC79XX_CONFIGED_RD_STRM,
214         AIC79XX_CONFIGED_RD_STRM,
215         AIC79XX_CONFIGED_RD_STRM,
216         AIC79XX_CONFIGED_RD_STRM,
217         AIC79XX_CONFIGED_RD_STRM,
218         AIC79XX_CONFIGED_RD_STRM,
219         AIC79XX_CONFIGED_RD_STRM
220 };
221
222 /*
223  * DV option:
224  *
225  * positive value = DV Enabled
226  * zero           = DV Disabled
227  * negative value = DV Default for adapter type/seeprom
228  */
229 #ifdef CONFIG_AIC79XX_DV_SETTING
230 #define AIC79XX_CONFIGED_DV CONFIG_AIC79XX_DV_SETTING
231 #else
232 #define AIC79XX_CONFIGED_DV -1
233 #endif
234
235 static int8_t aic79xx_dv_settings[] =
236 {
237         AIC79XX_CONFIGED_DV,
238         AIC79XX_CONFIGED_DV,
239         AIC79XX_CONFIGED_DV,
240         AIC79XX_CONFIGED_DV,
241         AIC79XX_CONFIGED_DV,
242         AIC79XX_CONFIGED_DV,
243         AIC79XX_CONFIGED_DV,
244         AIC79XX_CONFIGED_DV,
245         AIC79XX_CONFIGED_DV,
246         AIC79XX_CONFIGED_DV,
247         AIC79XX_CONFIGED_DV,
248         AIC79XX_CONFIGED_DV,
249         AIC79XX_CONFIGED_DV,
250         AIC79XX_CONFIGED_DV,
251         AIC79XX_CONFIGED_DV,
252         AIC79XX_CONFIGED_DV
253 };
254
255 /*
256  * The I/O cell on the chip is very configurable in respect to its analog
257  * characteristics.  Set the defaults here; they can be overriden with
258  * the proper insmod parameters.
259  */
260 struct ahd_linux_iocell_opts
261 {
262         uint8_t precomp;
263         uint8_t slewrate;
264         uint8_t amplitude;
265 };
266 #define AIC79XX_DEFAULT_PRECOMP         0xFF
267 #define AIC79XX_DEFAULT_SLEWRATE        0xFF
268 #define AIC79XX_DEFAULT_AMPLITUDE       0xFF
269 #define AIC79XX_DEFAULT_IOOPTS                  \
270 {                                               \
271         AIC79XX_DEFAULT_PRECOMP,                \
272         AIC79XX_DEFAULT_SLEWRATE,               \
273         AIC79XX_DEFAULT_AMPLITUDE               \
274 }
275 #define AIC79XX_PRECOMP_INDEX   0
276 #define AIC79XX_SLEWRATE_INDEX  1
277 #define AIC79XX_AMPLITUDE_INDEX 2
278 static struct ahd_linux_iocell_opts aic79xx_iocell_info[] =
279 {
280         AIC79XX_DEFAULT_IOOPTS,
281         AIC79XX_DEFAULT_IOOPTS,
282         AIC79XX_DEFAULT_IOOPTS,
283         AIC79XX_DEFAULT_IOOPTS,
284         AIC79XX_DEFAULT_IOOPTS,
285         AIC79XX_DEFAULT_IOOPTS,
286         AIC79XX_DEFAULT_IOOPTS,
287         AIC79XX_DEFAULT_IOOPTS,
288         AIC79XX_DEFAULT_IOOPTS,
289         AIC79XX_DEFAULT_IOOPTS,
290         AIC79XX_DEFAULT_IOOPTS,
291         AIC79XX_DEFAULT_IOOPTS,
292         AIC79XX_DEFAULT_IOOPTS,
293         AIC79XX_DEFAULT_IOOPTS,
294         AIC79XX_DEFAULT_IOOPTS,
295         AIC79XX_DEFAULT_IOOPTS
296 };
297
298 /*
299  * There should be a specific return value for this in scsi.h, but
300  * it seems that most drivers ignore it.
301  */
302 #define DID_UNDERFLOW   DID_ERROR
303
304 void
305 ahd_print_path(struct ahd_softc *ahd, struct scb *scb)
306 {
307         printk("(scsi%d:%c:%d:%d): ",
308                ahd->platform_data->host->host_no,
309                scb != NULL ? SCB_GET_CHANNEL(ahd, scb) : 'X',
310                scb != NULL ? SCB_GET_TARGET(ahd, scb) : -1,
311                scb != NULL ? SCB_GET_LUN(scb) : -1);
312 }
313
314 /*
315  * XXX - these options apply unilaterally to _all_ adapters
316  *       cards in the system.  This should be fixed.  Exceptions to this
317  *       rule are noted in the comments.
318  */
319
320 /*
321  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
322  * has no effect on any later resets that might occur due to things like
323  * SCSI bus timeouts.
324  */
325 static uint32_t aic79xx_no_reset;
326
327 /*
328  * Certain PCI motherboards will scan PCI devices from highest to lowest,
329  * others scan from lowest to highest, and they tend to do all kinds of
330  * strange things when they come into contact with PCI bridge chips.  The
331  * net result of all this is that the PCI card that is actually used to boot
332  * the machine is very hard to detect.  Most motherboards go from lowest
333  * PCI slot number to highest, and the first SCSI controller found is the
334  * one you boot from.  The only exceptions to this are when a controller
335  * has its BIOS disabled.  So, we by default sort all of our SCSI controllers
336  * from lowest PCI slot number to highest PCI slot number.  We also force
337  * all controllers with their BIOS disabled to the end of the list.  This
338  * works on *almost* all computers.  Where it doesn't work, we have this
339  * option.  Setting this option to non-0 will reverse the order of the sort
340  * to highest first, then lowest, but will still leave cards with their BIOS
341  * disabled at the very end.  That should fix everyone up unless there are
342  * really strange cirumstances.
343  */
344 static uint32_t aic79xx_reverse_scan;
345
346 /*
347  * Should we force EXTENDED translation on a controller.
348  *     0 == Use whatever is in the SEEPROM or default to off
349  *     1 == Use whatever is in the SEEPROM or default to on
350  */
351 static uint32_t aic79xx_extended;
352
353 /*
354  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
355  * dubious at best.  To my knowledge, this option has never actually
356  * solved a PCI parity problem, but on certain machines with broken PCI
357  * chipset configurations, it can generate tons of false error messages.
358  * It's included in the driver for completeness.
359  *   0     = Shut off PCI parity check
360  *   non-0 = Enable PCI parity check
361  *
362  * NOTE: you can't actually pass -1 on the lilo prompt.  So, to set this
363  * variable to -1 you would actually want to simply pass the variable
364  * name without a number.  That will invert the 0 which will result in
365  * -1.
366  */
367 static uint32_t aic79xx_pci_parity = ~0;
368
369 /*
370  * There are lots of broken chipsets in the world.  Some of them will
371  * violate the PCI spec when we issue byte sized memory writes to our
372  * controller.  I/O mapped register access, if allowed by the given
373  * platform, will work in almost all cases.
374  */
375 uint32_t aic79xx_allow_memio = ~0;
376
377 /*
378  * aic79xx_detect() has been run, so register all device arrivals
379  * immediately with the system rather than deferring to the sorted
380  * attachment performed by aic79xx_detect().
381  */
382 int aic79xx_detect_complete;
383
384 /*
385  * So that we can set how long each device is given as a selection timeout.
386  * The table of values goes like this:
387  *   0 - 256ms
388  *   1 - 128ms
389  *   2 - 64ms
390  *   3 - 32ms
391  * We default to 256ms because some older devices need a longer time
392  * to respond to initial selection.
393  */
394 static uint32_t aic79xx_seltime;
395
396 /*
397  * Certain devices do not perform any aging on commands.  Should the
398  * device be saturated by commands in one portion of the disk, it is
399  * possible for transactions on far away sectors to never be serviced.
400  * To handle these devices, we can periodically send an ordered tag to
401  * force all outstanding transactions to be serviced prior to a new
402  * transaction.
403  */
404 uint32_t aic79xx_periodic_otag;
405
406 /*
407  * Module information and settable options.
408  */
409 static char *aic79xx = NULL;
410
411 MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
412 MODULE_DESCRIPTION("Adaptec Aic790X U320 SCSI Host Bus Adapter driver");
413 MODULE_LICENSE("Dual BSD/GPL");
414 MODULE_VERSION(AIC79XX_DRIVER_VERSION);
415 module_param(aic79xx, charp, 0);
416 MODULE_PARM_DESC(aic79xx,
417 "period delimited, options string.\n"
418 "       verbose                 Enable verbose/diagnostic logging\n"
419 "       allow_memio             Allow device registers to be memory mapped\n"
420 "       debug                   Bitmask of debug values to enable\n"
421 "       no_reset                Supress initial bus resets\n"
422 "       extended                Enable extended geometry on all controllers\n"
423 "       periodic_otag           Send an ordered tagged transaction\n"
424 "                               periodically to prevent tag starvation.\n"
425 "                               This may be required by some older disk\n"
426 "                               or drives/RAID arrays.\n"
427 "       reverse_scan            Sort PCI devices highest Bus/Slot to lowest\n"
428 "       tag_info:<tag_str>      Set per-target tag depth\n"
429 "       global_tag_depth:<int>  Global tag depth for all targets on all buses\n"
430 "       rd_strm:<rd_strm_masks> Set per-target read streaming setting.\n"
431 "       dv:<dv_settings>        Set per-controller Domain Validation Setting.\n"
432 "       slewrate:<slewrate_list>Set the signal slew rate (0-15).\n"
433 "       precomp:<pcomp_list>    Set the signal precompensation (0-7).\n"
434 "       amplitude:<int>         Set the signal amplitude (0-7).\n"
435 "       seltime:<int>           Selection Timeout:\n"
436 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
437 "\n"
438 "       Sample /etc/modprobe.conf line:\n"
439 "               Enable verbose logging\n"
440 "               Set tag depth on Controller 2/Target 2 to 10 tags\n"
441 "               Shorten the selection timeout to 128ms\n"
442 "\n"
443 "       options aic79xx 'aic79xx=verbose.tag_info:{{}.{}.{..10}}.seltime:1'\n"
444 "\n"
445 "       Sample /etc/modprobe.conf line:\n"
446 "               Change Read Streaming for Controller's 2 and 3\n"
447 "\n"
448 "       options aic79xx 'aic79xx=rd_strm:{..0xFFF0.0xC0F0}'");
449
450 static void ahd_linux_handle_scsi_status(struct ahd_softc *,
451                                          struct ahd_linux_device *,
452                                          struct scb *);
453 static void ahd_linux_queue_cmd_complete(struct ahd_softc *ahd,
454                                          Scsi_Cmnd *cmd);
455 static void ahd_linux_filter_inquiry(struct ahd_softc *ahd,
456                                      struct ahd_devinfo *devinfo);
457 static void ahd_linux_dev_timed_unfreeze(u_long arg);
458 static void ahd_linux_sem_timeout(u_long arg);
459 static void ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd);
460 static void ahd_linux_size_nseg(void);
461 static void ahd_linux_thread_run_complete_queue(struct ahd_softc *ahd);
462 static void ahd_linux_start_dv(struct ahd_softc *ahd);
463 static void ahd_linux_dv_timeout(struct scsi_cmnd *cmd);
464 static int  ahd_linux_dv_thread(void *data);
465 static void ahd_linux_kill_dv_thread(struct ahd_softc *ahd);
466 static void ahd_linux_dv_target(struct ahd_softc *ahd, u_int target);
467 static void ahd_linux_dv_transition(struct ahd_softc *ahd,
468                                     struct scsi_cmnd *cmd,
469                                     struct ahd_devinfo *devinfo,
470                                     struct ahd_linux_target *targ);
471 static void ahd_linux_dv_fill_cmd(struct ahd_softc *ahd,
472                                   struct scsi_cmnd *cmd,
473                                   struct ahd_devinfo *devinfo);
474 static void ahd_linux_dv_inq(struct ahd_softc *ahd,
475                              struct scsi_cmnd *cmd,
476                              struct ahd_devinfo *devinfo,
477                              struct ahd_linux_target *targ,
478                              u_int request_length);
479 static void ahd_linux_dv_tur(struct ahd_softc *ahd,
480                              struct scsi_cmnd *cmd,
481                              struct ahd_devinfo *devinfo);
482 static void ahd_linux_dv_rebd(struct ahd_softc *ahd,
483                               struct scsi_cmnd *cmd,
484                               struct ahd_devinfo *devinfo,
485                               struct ahd_linux_target *targ);
486 static void ahd_linux_dv_web(struct ahd_softc *ahd,
487                              struct scsi_cmnd *cmd,
488                              struct ahd_devinfo *devinfo,
489                              struct ahd_linux_target *targ);
490 static void ahd_linux_dv_reb(struct ahd_softc *ahd,
491                              struct scsi_cmnd *cmd,
492                              struct ahd_devinfo *devinfo,
493                              struct ahd_linux_target *targ);
494 static void ahd_linux_dv_su(struct ahd_softc *ahd,
495                             struct scsi_cmnd *cmd,
496                             struct ahd_devinfo *devinfo,
497                             struct ahd_linux_target *targ);
498 static int ahd_linux_fallback(struct ahd_softc *ahd,
499                               struct ahd_devinfo *devinfo);
500 static __inline int ahd_linux_dv_fallback(struct ahd_softc *ahd,
501                                           struct ahd_devinfo *devinfo);
502 static void ahd_linux_dv_complete(Scsi_Cmnd *cmd);
503 static void ahd_linux_generate_dv_pattern(struct ahd_linux_target *targ);
504 static u_int ahd_linux_user_tagdepth(struct ahd_softc *ahd,
505                                      struct ahd_devinfo *devinfo);
506 static u_int ahd_linux_user_dv_setting(struct ahd_softc *ahd);
507 static void ahd_linux_setup_user_rd_strm_settings(struct ahd_softc *ahd);
508 static void ahd_linux_device_queue_depth(struct ahd_softc *ahd,
509                                          struct ahd_linux_device *dev);
510 static struct ahd_linux_target* ahd_linux_alloc_target(struct ahd_softc*,
511                                                        u_int, u_int);
512 static void                     ahd_linux_free_target(struct ahd_softc*,
513                                                       struct ahd_linux_target*);
514 static struct ahd_linux_device* ahd_linux_alloc_device(struct ahd_softc*,
515                                                        struct ahd_linux_target*,
516                                                        u_int);
517 static void                     ahd_linux_free_device(struct ahd_softc*,
518                                                       struct ahd_linux_device*);
519 static void ahd_linux_run_device_queue(struct ahd_softc*,
520                                        struct ahd_linux_device*);
521 static void ahd_linux_setup_tag_info_global(char *p);
522 static aic_option_callback_t ahd_linux_setup_tag_info;
523 static aic_option_callback_t ahd_linux_setup_rd_strm_info;
524 static aic_option_callback_t ahd_linux_setup_dv;
525 static aic_option_callback_t ahd_linux_setup_iocell_info;
526 static int ahd_linux_next_unit(void);
527 static void ahd_runq_tasklet(unsigned long data);
528 static int aic79xx_setup(char *c);
529
530 /****************************** Inlines ***************************************/
531 static __inline void ahd_schedule_completeq(struct ahd_softc *ahd);
532 static __inline void ahd_schedule_runq(struct ahd_softc *ahd);
533 static __inline void ahd_setup_runq_tasklet(struct ahd_softc *ahd);
534 static __inline void ahd_teardown_runq_tasklet(struct ahd_softc *ahd);
535 static __inline struct ahd_linux_device*
536                      ahd_linux_get_device(struct ahd_softc *ahd, u_int channel,
537                                           u_int target, u_int lun, int alloc);
538 static struct ahd_cmd *ahd_linux_run_complete_queue(struct ahd_softc *ahd);
539 static __inline void ahd_linux_check_device_queue(struct ahd_softc *ahd,
540                                                   struct ahd_linux_device *dev);
541 static __inline struct ahd_linux_device *
542                      ahd_linux_next_device_to_run(struct ahd_softc *ahd);
543 static __inline void ahd_linux_run_device_queues(struct ahd_softc *ahd);
544 static __inline void ahd_linux_unmap_scb(struct ahd_softc*, struct scb*);
545
546 static __inline void
547 ahd_schedule_completeq(struct ahd_softc *ahd)
548 {
549         if ((ahd->platform_data->flags & AHD_RUN_CMPLT_Q_TIMER) == 0) {
550                 ahd->platform_data->flags |= AHD_RUN_CMPLT_Q_TIMER;
551                 ahd->platform_data->completeq_timer.expires = jiffies;
552                 add_timer(&ahd->platform_data->completeq_timer);
553         }
554 }
555
556 /*
557  * Must be called with our lock held.
558  */
559 static __inline void
560 ahd_schedule_runq(struct ahd_softc *ahd)
561 {
562         tasklet_schedule(&ahd->platform_data->runq_tasklet);
563 }
564
565 static __inline
566 void ahd_setup_runq_tasklet(struct ahd_softc *ahd)
567 {
568         tasklet_init(&ahd->platform_data->runq_tasklet, ahd_runq_tasklet,
569                      (unsigned long)ahd);
570 }
571
572 static __inline void
573 ahd_teardown_runq_tasklet(struct ahd_softc *ahd)
574 {
575         tasklet_kill(&ahd->platform_data->runq_tasklet);
576 }
577
578 static __inline struct ahd_linux_device*
579 ahd_linux_get_device(struct ahd_softc *ahd, u_int channel, u_int target,
580                      u_int lun, int alloc)
581 {
582         struct ahd_linux_target *targ;
583         struct ahd_linux_device *dev;
584         u_int target_offset;
585
586         target_offset = target;
587         if (channel != 0)
588                 target_offset += 8;
589         targ = ahd->platform_data->targets[target_offset];
590         if (targ == NULL) {
591                 if (alloc != 0) {
592                         targ = ahd_linux_alloc_target(ahd, channel, target);
593                         if (targ == NULL)
594                                 return (NULL);
595                 } else
596                         return (NULL);
597         }
598         dev = targ->devices[lun];
599         if (dev == NULL && alloc != 0)
600                 dev = ahd_linux_alloc_device(ahd, targ, lun);
601         return (dev);
602 }
603
604 #define AHD_LINUX_MAX_RETURNED_ERRORS 4
605 static struct ahd_cmd *
606 ahd_linux_run_complete_queue(struct ahd_softc *ahd)
607 {       
608         struct  ahd_cmd *acmd;
609         u_long  done_flags;
610         int     with_errors;
611
612         with_errors = 0;
613         ahd_done_lock(ahd, &done_flags);
614         while ((acmd = TAILQ_FIRST(&ahd->platform_data->completeq)) != NULL) {
615                 Scsi_Cmnd *cmd;
616
617                 if (with_errors > AHD_LINUX_MAX_RETURNED_ERRORS) {
618                         /*
619                          * Linux uses stack recursion to requeue
620                          * commands that need to be retried.  Avoid
621                          * blowing out the stack by "spoon feeding"
622                          * commands that completed with error back
623                          * the operating system in case they are going
624                          * to be retried. "ick"
625                          */
626                         ahd_schedule_completeq(ahd);
627                         break;
628                 }
629                 TAILQ_REMOVE(&ahd->platform_data->completeq,
630                              acmd, acmd_links.tqe);
631                 cmd = &acmd_scsi_cmd(acmd);
632                 cmd->host_scribble = NULL;
633                 if (ahd_cmd_get_transaction_status(cmd) != DID_OK
634                  || (cmd->result & 0xFF) != SCSI_STATUS_OK)
635                         with_errors++;
636
637                 cmd->scsi_done(cmd);
638         }
639         ahd_done_unlock(ahd, &done_flags);
640         return (acmd);
641 }
642
643 static __inline void
644 ahd_linux_check_device_queue(struct ahd_softc *ahd,
645                              struct ahd_linux_device *dev)
646 {
647         if ((dev->flags & AHD_DEV_FREEZE_TIL_EMPTY) != 0
648          && dev->active == 0) {
649                 dev->flags &= ~AHD_DEV_FREEZE_TIL_EMPTY;
650                 dev->qfrozen--;
651         }
652
653         if (TAILQ_FIRST(&dev->busyq) == NULL
654          || dev->openings == 0 || dev->qfrozen != 0)
655                 return;
656
657         ahd_linux_run_device_queue(ahd, dev);
658 }
659
660 static __inline struct ahd_linux_device *
661 ahd_linux_next_device_to_run(struct ahd_softc *ahd)
662 {
663         
664         if ((ahd->flags & AHD_RESOURCE_SHORTAGE) != 0
665          || (ahd->platform_data->qfrozen != 0
666           && AHD_DV_SIMQ_FROZEN(ahd) == 0))
667                 return (NULL);
668         return (TAILQ_FIRST(&ahd->platform_data->device_runq));
669 }
670
671 static __inline void
672 ahd_linux_run_device_queues(struct ahd_softc *ahd)
673 {
674         struct ahd_linux_device *dev;
675
676         while ((dev = ahd_linux_next_device_to_run(ahd)) != NULL) {
677                 TAILQ_REMOVE(&ahd->platform_data->device_runq, dev, links);
678                 dev->flags &= ~AHD_DEV_ON_RUN_LIST;
679                 ahd_linux_check_device_queue(ahd, dev);
680         }
681 }
682
683 static __inline void
684 ahd_linux_unmap_scb(struct ahd_softc *ahd, struct scb *scb)
685 {
686         Scsi_Cmnd *cmd;
687         int direction;
688
689         cmd = scb->io_ctx;
690         direction = cmd->sc_data_direction;
691         ahd_sync_sglist(ahd, scb, BUS_DMASYNC_POSTWRITE);
692         if (cmd->use_sg != 0) {
693                 struct scatterlist *sg;
694
695                 sg = (struct scatterlist *)cmd->request_buffer;
696                 pci_unmap_sg(ahd->dev_softc, sg, cmd->use_sg, direction);
697         } else if (cmd->request_bufflen != 0) {
698                 pci_unmap_single(ahd->dev_softc,
699                                  scb->platform_data->buf_busaddr,
700                                  cmd->request_bufflen, direction);
701         }
702 }
703
704 /******************************** Macros **************************************/
705 #define BUILD_SCSIID(ahd, cmd)                                          \
706         ((((cmd)->device->id << TID_SHIFT) & TID) | (ahd)->our_id)
707
708 /************************  Host template entry points *************************/
709 static int         ahd_linux_detect(Scsi_Host_Template *);
710 static const char *ahd_linux_info(struct Scsi_Host *);
711 static int         ahd_linux_queue(Scsi_Cmnd *, void (*)(Scsi_Cmnd *));
712 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
713 static int         ahd_linux_slave_alloc(Scsi_Device *);
714 static int         ahd_linux_slave_configure(Scsi_Device *);
715 static void        ahd_linux_slave_destroy(Scsi_Device *);
716 #if defined(__i386__)
717 static int         ahd_linux_biosparam(struct scsi_device*,
718                                        struct block_device*, sector_t, int[]);
719 #endif
720 #else
721 static int         ahd_linux_release(struct Scsi_Host *);
722 static void        ahd_linux_select_queue_depth(struct Scsi_Host *host,
723                                                 Scsi_Device *scsi_devs);
724 #if defined(__i386__)
725 static int         ahd_linux_biosparam(Disk *, kdev_t, int[]);
726 #endif
727 #endif
728 static int         ahd_linux_bus_reset(Scsi_Cmnd *);
729 static int         ahd_linux_dev_reset(Scsi_Cmnd *);
730 static int         ahd_linux_abort(Scsi_Cmnd *);
731
732 /*
733  * Calculate a safe value for AHD_NSEG (as expressed through ahd_linux_nseg).
734  *
735  * In pre-2.5.X...
736  * The midlayer allocates an S/G array dynamically when a command is issued
737  * using SCSI malloc.  This array, which is in an OS dependent format that
738  * must later be copied to our private S/G list, is sized to house just the
739  * number of segments needed for the current transfer.  Since the code that
740  * sizes the SCSI malloc pool does not take into consideration fragmentation
741  * of the pool, executing transactions numbering just a fraction of our
742  * concurrent transaction limit with SG list lengths aproaching AHC_NSEG will
743  * quickly depleat the SCSI malloc pool of usable space.  Unfortunately, the
744  * mid-layer does not properly handle this scsi malloc failures for the S/G
745  * array and the result can be a lockup of the I/O subsystem.  We try to size
746  * our S/G list so that it satisfies our drivers allocation requirements in
747  * addition to avoiding fragmentation of the SCSI malloc pool.
748  */
749 static void
750 ahd_linux_size_nseg(void)
751 {
752 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
753         u_int cur_size;
754         u_int best_size;
755
756         /*
757          * The SCSI allocator rounds to the nearest 512 bytes
758          * an cannot allocate across a page boundary.  Our algorithm
759          * is to start at 1K of scsi malloc space per-command and
760          * loop through all factors of the PAGE_SIZE and pick the best.
761          */
762         best_size = 0;
763         for (cur_size = 1024; cur_size <= PAGE_SIZE; cur_size *= 2) {
764                 u_int nseg;
765
766                 nseg = cur_size / sizeof(struct scatterlist);
767                 if (nseg < AHD_LINUX_MIN_NSEG)
768                         continue;
769
770                 if (best_size == 0) {
771                         best_size = cur_size;
772                         ahd_linux_nseg = nseg;
773                 } else {
774                         u_int best_rem;
775                         u_int cur_rem;
776
777                         /*
778                          * Compare the traits of the current "best_size"
779                          * with the current size to determine if the
780                          * current size is a better size.
781                          */
782                         best_rem = best_size % sizeof(struct scatterlist);
783                         cur_rem = cur_size % sizeof(struct scatterlist);
784                         if (cur_rem < best_rem) {
785                                 best_size = cur_size;
786                                 ahd_linux_nseg = nseg;
787                         }
788                 }
789         }
790 #endif
791 }
792
793 /*
794  * Try to detect an Adaptec 79XX controller.
795  */
796 static int
797 ahd_linux_detect(Scsi_Host_Template *template)
798 {
799         struct  ahd_softc *ahd;
800         int     found;
801         int     error = 0;
802
803 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
804         /*
805          * It is a bug that the upper layer takes
806          * this lock just prior to calling us.
807          */
808         spin_unlock_irq(&io_request_lock);
809 #endif
810
811         /*
812          * Sanity checking of Linux SCSI data structures so
813          * that some of our hacks^H^H^H^H^Hassumptions aren't
814          * violated.
815          */
816         if (offsetof(struct ahd_cmd_internal, end)
817           > offsetof(struct scsi_cmnd, host_scribble)) {
818                 printf("ahd_linux_detect: SCSI data structures changed.\n");
819                 printf("ahd_linux_detect: Unable to attach\n");
820                 return (0);
821         }
822         /*
823          * Determine an appropriate size for our Scatter Gatther lists.
824          */
825         ahd_linux_size_nseg();
826 #ifdef MODULE
827         /*
828          * If we've been passed any parameters, process them now.
829          */
830         if (aic79xx)
831                 aic79xx_setup(aic79xx);
832 #endif
833
834         template->proc_name = "aic79xx";
835
836         /*
837          * Initialize our softc list lock prior to
838          * probing for any adapters.
839          */
840         ahd_list_lockinit();
841
842 #ifdef CONFIG_PCI
843         error = ahd_linux_pci_init();
844         if (error)
845                 return error;
846 #endif
847
848         /*
849          * Register with the SCSI layer all
850          * controllers we've found.
851          */
852         found = 0;
853         TAILQ_FOREACH(ahd, &ahd_tailq, links) {
854
855                 if (ahd_linux_register_host(ahd, template) == 0)
856                         found++;
857         }
858 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
859         spin_lock_irq(&io_request_lock);
860 #endif
861         aic79xx_detect_complete++;
862         return 0;
863 }
864
865 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
866 /*
867  * Free the passed in Scsi_Host memory structures prior to unloading the
868  * module.
869  */
870 static int
871 ahd_linux_release(struct Scsi_Host * host)
872 {
873         struct ahd_softc *ahd;
874         u_long l;
875
876         ahd_list_lock(&l);
877         if (host != NULL) {
878
879                 /*
880                  * We should be able to just perform
881                  * the free directly, but check our
882                  * list for extra sanity.
883                  */
884                 ahd = ahd_find_softc(*(struct ahd_softc **)host->hostdata);
885                 if (ahd != NULL) {
886                         u_long s;
887
888                         ahd_lock(ahd, &s);
889                         ahd_intr_enable(ahd, FALSE);
890                         ahd_unlock(ahd, &s);
891                         ahd_free(ahd);
892                 }
893         }
894         ahd_list_unlock(&l);
895         return (0);
896 }
897 #endif
898
899 /*
900  * Return a string describing the driver.
901  */
902 static const char *
903 ahd_linux_info(struct Scsi_Host *host)
904 {
905         static char buffer[512];
906         char    ahd_info[256];
907         char   *bp;
908         struct ahd_softc *ahd;
909
910         bp = &buffer[0];
911         ahd = *(struct ahd_softc **)host->hostdata;
912         memset(bp, 0, sizeof(buffer));
913         strcpy(bp, "Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev ");
914         strcat(bp, AIC79XX_DRIVER_VERSION);
915         strcat(bp, "\n");
916         strcat(bp, "        <");
917         strcat(bp, ahd->description);
918         strcat(bp, ">\n");
919         strcat(bp, "        ");
920         ahd_controller_info(ahd, ahd_info);
921         strcat(bp, ahd_info);
922         strcat(bp, "\n");
923
924         return (bp);
925 }
926
927 /*
928  * Queue an SCB to the controller.
929  */
930 static int
931 ahd_linux_queue(Scsi_Cmnd * cmd, void (*scsi_done) (Scsi_Cmnd *))
932 {
933         struct   ahd_softc *ahd;
934         struct   ahd_linux_device *dev;
935         u_long   flags;
936
937         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
938
939         /*
940          * Save the callback on completion function.
941          */
942         cmd->scsi_done = scsi_done;
943
944         ahd_midlayer_entrypoint_lock(ahd, &flags);
945
946         /*
947          * Close the race of a command that was in the process of
948          * being queued to us just as our simq was frozen.  Let
949          * DV commands through so long as we are only frozen to
950          * perform DV.
951          */
952         if (ahd->platform_data->qfrozen != 0
953          && AHD_DV_CMD(cmd) == 0) {
954
955                 ahd_cmd_set_transaction_status(cmd, CAM_REQUEUE_REQ);
956                 ahd_linux_queue_cmd_complete(ahd, cmd);
957                 ahd_schedule_completeq(ahd);
958                 ahd_midlayer_entrypoint_unlock(ahd, &flags);
959                 return (0);
960         }
961         dev = ahd_linux_get_device(ahd, cmd->device->channel,
962                                    cmd->device->id, cmd->device->lun,
963                                    /*alloc*/TRUE);
964         if (dev == NULL) {
965                 ahd_cmd_set_transaction_status(cmd, CAM_RESRC_UNAVAIL);
966                 ahd_linux_queue_cmd_complete(ahd, cmd);
967                 ahd_schedule_completeq(ahd);
968                 ahd_midlayer_entrypoint_unlock(ahd, &flags);
969                 printf("%s: aic79xx_linux_queue - Unable to allocate device!\n",
970                        ahd_name(ahd));
971                 return (0);
972         }
973         if (cmd->cmd_len > MAX_CDB_LEN)
974                 return (-EINVAL);
975         cmd->result = CAM_REQ_INPROG << 16;
976         TAILQ_INSERT_TAIL(&dev->busyq, (struct ahd_cmd *)cmd, acmd_links.tqe);
977         if ((dev->flags & AHD_DEV_ON_RUN_LIST) == 0) {
978                 TAILQ_INSERT_TAIL(&ahd->platform_data->device_runq, dev, links);
979                 dev->flags |= AHD_DEV_ON_RUN_LIST;
980                 ahd_linux_run_device_queues(ahd);
981         }
982         ahd_midlayer_entrypoint_unlock(ahd, &flags);
983         return (0);
984 }
985
986 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
987 static int
988 ahd_linux_slave_alloc(Scsi_Device *device)
989 {
990         struct  ahd_softc *ahd;
991
992         ahd = *((struct ahd_softc **)device->host->hostdata);
993         if (bootverbose)
994                 printf("%s: Slave Alloc %d\n", ahd_name(ahd), device->id);
995         return (0);
996 }
997
998 static int
999 ahd_linux_slave_configure(Scsi_Device *device)
1000 {
1001         struct  ahd_softc *ahd;
1002         struct  ahd_linux_device *dev;
1003         u_long  flags;
1004
1005         ahd = *((struct ahd_softc **)device->host->hostdata);
1006         if (bootverbose)
1007                 printf("%s: Slave Configure %d\n", ahd_name(ahd), device->id);
1008         ahd_midlayer_entrypoint_lock(ahd, &flags);
1009         /*
1010          * Since Linux has attached to the device, configure
1011          * it so we don't free and allocate the device
1012          * structure on every command.
1013          */
1014         dev = ahd_linux_get_device(ahd, device->channel,
1015                                    device->id, device->lun,
1016                                    /*alloc*/TRUE);
1017         if (dev != NULL) {
1018                 dev->flags &= ~AHD_DEV_UNCONFIGURED;
1019                 dev->flags |= AHD_DEV_SLAVE_CONFIGURED;
1020                 dev->scsi_device = device;
1021                 ahd_linux_device_queue_depth(ahd, dev);
1022         }
1023         ahd_midlayer_entrypoint_unlock(ahd, &flags);
1024         return (0);
1025 }
1026
1027 static void
1028 ahd_linux_slave_destroy(Scsi_Device *device)
1029 {
1030         struct  ahd_softc *ahd;
1031         struct  ahd_linux_device *dev;
1032         u_long  flags;
1033
1034         ahd = *((struct ahd_softc **)device->host->hostdata);
1035         if (bootverbose)
1036                 printf("%s: Slave Destroy %d\n", ahd_name(ahd), device->id);
1037         ahd_midlayer_entrypoint_lock(ahd, &flags);
1038         dev = ahd_linux_get_device(ahd, device->channel,
1039                                    device->id, device->lun,
1040                                            /*alloc*/FALSE);
1041
1042         /*
1043          * Filter out "silly" deletions of real devices by only
1044          * deleting devices that have had slave_configure()
1045          * called on them.  All other devices that have not
1046          * been configured will automatically be deleted by
1047          * the refcounting process.
1048          */
1049         if (dev != NULL
1050          && (dev->flags & AHD_DEV_SLAVE_CONFIGURED) != 0) {
1051                 dev->flags |= AHD_DEV_UNCONFIGURED;
1052                 if (TAILQ_EMPTY(&dev->busyq)
1053                  && dev->active == 0
1054                  && (dev->flags & AHD_DEV_TIMER_ACTIVE) == 0)
1055                         ahd_linux_free_device(ahd, dev);
1056         }
1057         ahd_midlayer_entrypoint_unlock(ahd, &flags);
1058 }
1059 #else
1060 /*
1061  * Sets the queue depth for each SCSI device hanging
1062  * off the input host adapter.
1063  */
1064 static void
1065 ahd_linux_select_queue_depth(struct Scsi_Host * host,
1066                              Scsi_Device * scsi_devs)
1067 {
1068         Scsi_Device *device;
1069         Scsi_Device *ldev;
1070         struct  ahd_softc *ahd;
1071         u_long  flags;
1072
1073         ahd = *((struct ahd_softc **)host->hostdata);
1074         ahd_lock(ahd, &flags);
1075         for (device = scsi_devs; device != NULL; device = device->next) {
1076
1077                 /*
1078                  * Watch out for duplicate devices.  This works around
1079                  * some quirks in how the SCSI scanning code does its
1080                  * device management.
1081                  */
1082                 for (ldev = scsi_devs; ldev != device; ldev = ldev->next) {
1083                         if (ldev->host == device->host
1084                          && ldev->channel == device->channel
1085                          && ldev->id == device->id
1086                          && ldev->lun == device->lun)
1087                                 break;
1088                 }
1089                 /* Skip duplicate. */
1090                 if (ldev != device)
1091                         continue;
1092
1093                 if (device->host == host) {
1094                         struct   ahd_linux_device *dev;
1095
1096                         /*
1097                          * Since Linux has attached to the device, configure
1098                          * it so we don't free and allocate the device
1099                          * structure on every command.
1100                          */
1101                         dev = ahd_linux_get_device(ahd, device->channel,
1102                                                    device->id, device->lun,
1103                                                    /*alloc*/TRUE);
1104                         if (dev != NULL) {
1105                                 dev->flags &= ~AHD_DEV_UNCONFIGURED;
1106                                 dev->scsi_device = device;
1107                                 ahd_linux_device_queue_depth(ahd, dev);
1108                                 device->queue_depth = dev->openings
1109                                                     + dev->active;
1110                                 if ((dev->flags & (AHD_DEV_Q_BASIC
1111                                                 | AHD_DEV_Q_TAGGED)) == 0) {
1112                                         /*
1113                                          * We allow the OS to queue 2 untagged
1114                                          * transactions to us at any time even
1115                                          * though we can only execute them
1116                                          * serially on the controller/device.
1117                                          * This should remove some latency.
1118                                          */
1119                                         device->queue_depth = 2;
1120                                 }
1121                         }
1122                 }
1123         }
1124         ahd_unlock(ahd, &flags);
1125 }
1126 #endif
1127
1128 #if defined(__i386__)
1129 /*
1130  * Return the disk geometry for the given SCSI device.
1131  */
1132 static int
1133 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
1134 ahd_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
1135                     sector_t capacity, int geom[])
1136 {
1137         uint8_t *bh;
1138 #else
1139 ahd_linux_biosparam(Disk *disk, kdev_t dev, int geom[])
1140 {
1141         struct  scsi_device *sdev = disk->device;
1142         u_long  capacity = disk->capacity;
1143         struct  buffer_head *bh;
1144 #endif
1145         int      heads;
1146         int      sectors;
1147         int      cylinders;
1148         int      ret;
1149         int      extended;
1150         struct   ahd_softc *ahd;
1151
1152         ahd = *((struct ahd_softc **)sdev->host->hostdata);
1153
1154 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
1155         bh = scsi_bios_ptable(bdev);
1156 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,17)
1157         bh = bread(MKDEV(MAJOR(dev), MINOR(dev) & ~0xf), 0, block_size(dev));
1158 #else
1159         bh = bread(MKDEV(MAJOR(dev), MINOR(dev) & ~0xf), 0, 1024);
1160 #endif
1161
1162         if (bh) {
1163                 ret = scsi_partsize(bh, capacity,
1164                                     &geom[2], &geom[0], &geom[1]);
1165 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
1166                 kfree(bh);
1167 #else
1168                 brelse(bh);
1169 #endif
1170                 if (ret != -1)
1171                         return (ret);
1172         }
1173         heads = 64;
1174         sectors = 32;
1175         cylinders = aic_sector_div(capacity, heads, sectors);
1176
1177         if (aic79xx_extended != 0)
1178                 extended = 1;
1179         else
1180                 extended = (ahd->flags & AHD_EXTENDED_TRANS_A) != 0;
1181         if (extended && cylinders >= 1024) {
1182                 heads = 255;
1183                 sectors = 63;
1184                 cylinders = aic_sector_div(capacity, heads, sectors);
1185         }
1186         geom[0] = heads;
1187         geom[1] = sectors;
1188         geom[2] = cylinders;
1189         return (0);
1190 }
1191 #endif
1192
1193 /*
1194  * Abort the current SCSI command(s).
1195  */
1196 static int
1197 ahd_linux_abort(Scsi_Cmnd *cmd)
1198 {
1199         struct ahd_softc *ahd;
1200         struct ahd_cmd *acmd;
1201         struct ahd_cmd *list_acmd;
1202         struct ahd_linux_device *dev;
1203         struct scb *pending_scb;
1204         u_long s;
1205         u_int  saved_scbptr;
1206         u_int  active_scbptr;
1207         u_int  last_phase;
1208         u_int  cdb_byte;
1209         int    retval;
1210         int    was_paused;
1211         int    paused;
1212         int    wait;
1213         int    disconnected;
1214         ahd_mode_state saved_modes;
1215
1216         pending_scb = NULL;
1217         paused = FALSE;
1218         wait = FALSE;
1219         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
1220         acmd = (struct ahd_cmd *)cmd;
1221
1222         printf("%s:%d:%d:%d: Attempting to abort cmd %p:",
1223                ahd_name(ahd), cmd->device->channel, cmd->device->id,
1224                cmd->device->lun, cmd);
1225         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
1226                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
1227         printf("\n");
1228
1229         /*
1230          * In all versions of Linux, we have to work around
1231          * a major flaw in how the mid-layer is locked down
1232          * if we are to sleep successfully in our error handler
1233          * while allowing our interrupt handler to run.  Since
1234          * the midlayer acquires either the io_request_lock or
1235          * our lock prior to calling us, we must use the
1236          * spin_unlock_irq() method for unlocking our lock.
1237          * This will force interrupts to be enabled on the
1238          * current CPU.  Since the EH thread should not have
1239          * been running with CPU interrupts disabled other than
1240          * by acquiring either the io_request_lock or our own
1241          * lock, this *should* be safe.
1242          */
1243         ahd_midlayer_entrypoint_lock(ahd, &s);
1244
1245         /*
1246          * First determine if we currently own this command.
1247          * Start by searching the device queue.  If not found
1248          * there, check the pending_scb list.  If not found
1249          * at all, and the system wanted us to just abort the
1250          * command, return success.
1251          */
1252         dev = ahd_linux_get_device(ahd, cmd->device->channel,
1253                                    cmd->device->id, cmd->device->lun,
1254                                    /*alloc*/FALSE);
1255
1256         if (dev == NULL) {
1257                 /*
1258                  * No target device for this command exists,
1259                  * so we must not still own the command.
1260                  */
1261                 printf("%s:%d:%d:%d: Is not an active device\n",
1262                        ahd_name(ahd), cmd->device->channel, cmd->device->id,
1263                        cmd->device->lun);
1264                 retval = SUCCESS;
1265                 goto no_cmd;
1266         }
1267
1268         TAILQ_FOREACH(list_acmd, &dev->busyq, acmd_links.tqe) {
1269                 if (list_acmd == acmd)
1270                         break;
1271         }
1272
1273         if (list_acmd != NULL) {
1274                 printf("%s:%d:%d:%d: Command found on device queue\n",
1275                        ahd_name(ahd), cmd->device->channel, cmd->device->id,
1276                        cmd->device->lun);
1277                 TAILQ_REMOVE(&dev->busyq, list_acmd, acmd_links.tqe);
1278                 cmd->result = DID_ABORT << 16;
1279                 ahd_linux_queue_cmd_complete(ahd, cmd);
1280                 retval = SUCCESS;
1281                 goto done;
1282         }
1283
1284         /*
1285          * See if we can find a matching cmd in the pending list.
1286          */
1287         LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
1288                 if (pending_scb->io_ctx == cmd)
1289                         break;
1290         }
1291
1292         if (pending_scb == NULL) {
1293                 printf("%s:%d:%d:%d: Command not found\n",
1294                        ahd_name(ahd), cmd->device->channel, cmd->device->id,
1295                        cmd->device->lun);
1296                 goto no_cmd;
1297         }
1298
1299         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
1300                 /*
1301                  * We can't queue two recovery actions using the same SCB
1302                  */
1303                 retval = FAILED;
1304                 goto  done;
1305         }
1306
1307         /*
1308          * Ensure that the card doesn't do anything
1309          * behind our back.  Also make sure that we
1310          * didn't "just" miss an interrupt that would
1311          * affect this cmd.
1312          */
1313         was_paused = ahd_is_paused(ahd);
1314         ahd_pause_and_flushwork(ahd);
1315         paused = TRUE;
1316
1317         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
1318                 printf("%s:%d:%d:%d: Command already completed\n",
1319                        ahd_name(ahd), cmd->device->channel, cmd->device->id,
1320                        cmd->device->lun);
1321                 goto no_cmd;
1322         }
1323
1324         printf("%s: At time of recovery, card was %spaused\n",
1325                ahd_name(ahd), was_paused ? "" : "not ");
1326         ahd_dump_card_state(ahd);
1327
1328         disconnected = TRUE;
1329         if (ahd_search_qinfifo(ahd, cmd->device->id, cmd->device->channel + 'A',
1330                                cmd->device->lun, SCB_GET_TAG(pending_scb),
1331                                ROLE_INITIATOR, CAM_REQ_ABORTED,
1332                                SEARCH_COMPLETE) > 0) {
1333                 printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
1334                        ahd_name(ahd), cmd->device->channel, cmd->device->id,
1335                                 cmd->device->lun);
1336                 retval = SUCCESS;
1337                 goto done;
1338         }
1339
1340         saved_modes = ahd_save_modes(ahd);
1341         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
1342         last_phase = ahd_inb(ahd, LASTPHASE);
1343         saved_scbptr = ahd_get_scbptr(ahd);
1344         active_scbptr = saved_scbptr;
1345         if (disconnected && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
1346                 struct scb *bus_scb;
1347
1348                 bus_scb = ahd_lookup_scb(ahd, active_scbptr);
1349                 if (bus_scb == pending_scb)
1350                         disconnected = FALSE;
1351         }
1352
1353         /*
1354          * At this point, pending_scb is the scb associated with the
1355          * passed in command.  That command is currently active on the
1356          * bus or is in the disconnected state.
1357          */
1358         if (last_phase != P_BUSFREE
1359          && SCB_GET_TAG(pending_scb) == active_scbptr) {
1360
1361                 /*
1362                  * We're active on the bus, so assert ATN
1363                  * and hope that the target responds.
1364                  */
1365                 pending_scb = ahd_lookup_scb(ahd, active_scbptr);
1366                 pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
1367                 ahd_outb(ahd, MSG_OUT, HOST_MSG);
1368                 ahd_outb(ahd, SCSISIGO, last_phase|ATNO);
1369                 printf("%s:%d:%d:%d: Device is active, asserting ATN\n",
1370                        ahd_name(ahd), cmd->device->channel,
1371                        cmd->device->id, cmd->device->lun);
1372                 wait = TRUE;
1373         } else if (disconnected) {
1374
1375                 /*
1376                  * Actually re-queue this SCB in an attempt
1377                  * to select the device before it reconnects.
1378                  */
1379                 pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
1380                 ahd_set_scbptr(ahd, SCB_GET_TAG(pending_scb));
1381                 pending_scb->hscb->cdb_len = 0;
1382                 pending_scb->hscb->task_attribute = 0;
1383                 pending_scb->hscb->task_management = SIU_TASKMGMT_ABORT_TASK;
1384
1385                 if ((pending_scb->flags & SCB_PACKETIZED) != 0) {
1386                         /*
1387                          * Mark the SCB has having an outstanding
1388                          * task management function.  Should the command
1389                          * complete normally before the task management
1390                          * function can be sent, the host will be notified
1391                          * to abort our requeued SCB.
1392                          */
1393                         ahd_outb(ahd, SCB_TASK_MANAGEMENT,
1394                                  pending_scb->hscb->task_management);
1395                 } else {
1396                         /*
1397                          * If non-packetized, set the MK_MESSAGE control
1398                          * bit indicating that we desire to send a message.
1399                          * We also set the disconnected flag since there is
1400                          * no guarantee that our SCB control byte matches
1401                          * the version on the card.  We don't want the
1402                          * sequencer to abort the command thinking an
1403                          * unsolicited reselection occurred.
1404                          */
1405                         pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
1406
1407                         /*
1408                          * The sequencer will never re-reference the
1409                          * in-core SCB.  To make sure we are notified
1410                          * during reslection, set the MK_MESSAGE flag in
1411                          * the card's copy of the SCB.
1412                          */
1413                         ahd_outb(ahd, SCB_CONTROL,
1414                                  ahd_inb(ahd, SCB_CONTROL)|MK_MESSAGE);
1415                 }
1416
1417                 /*
1418                  * Clear out any entries in the QINFIFO first
1419                  * so we are the next SCB for this target
1420                  * to run.
1421                  */
1422                 ahd_search_qinfifo(ahd, cmd->device->id,
1423                                    cmd->device->channel + 'A', cmd->device->lun,
1424                                    SCB_LIST_NULL, ROLE_INITIATOR,
1425                                    CAM_REQUEUE_REQ, SEARCH_COMPLETE);
1426                 ahd_qinfifo_requeue_tail(ahd, pending_scb);
1427                 ahd_set_scbptr(ahd, saved_scbptr);
1428                 ahd_print_path(ahd, pending_scb);
1429                 printf("Device is disconnected, re-queuing SCB\n");
1430                 wait = TRUE;
1431         } else {
1432                 printf("%s:%d:%d:%d: Unable to deliver message\n",
1433                        ahd_name(ahd), cmd->device->channel,
1434                        cmd->device->id, cmd->device->lun);
1435                 retval = FAILED;
1436                 goto done;
1437         }
1438
1439 no_cmd:
1440         /*
1441          * Our assumption is that if we don't have the command, no
1442          * recovery action was required, so we return success.  Again,
1443          * the semantics of the mid-layer recovery engine are not
1444          * well defined, so this may change in time.
1445          */
1446         retval = SUCCESS;
1447 done:
1448         if (paused)
1449                 ahd_unpause(ahd);
1450         if (wait) {
1451                 struct timer_list timer;
1452                 int ret;
1453
1454                 pending_scb->platform_data->flags |= AHD_SCB_UP_EH_SEM;
1455                 spin_unlock_irq(&ahd->platform_data->spin_lock);
1456                 init_timer(&timer);
1457                 timer.data = (u_long)pending_scb;
1458                 timer.expires = jiffies + (5 * HZ);
1459                 timer.function = ahd_linux_sem_timeout;
1460                 add_timer(&timer);
1461                 printf("Recovery code sleeping\n");
1462                 down(&ahd->platform_data->eh_sem);
1463                 printf("Recovery code awake\n");
1464                 ret = del_timer_sync(&timer);
1465                 if (ret == 0) {
1466                         printf("Timer Expired\n");
1467                         retval = FAILED;
1468                 }
1469                 spin_lock_irq(&ahd->platform_data->spin_lock);
1470         }
1471         ahd_schedule_runq(ahd);
1472         ahd_linux_run_complete_queue(ahd);
1473         ahd_midlayer_entrypoint_unlock(ahd, &s);
1474         return (retval);
1475 }
1476
1477
1478 static void
1479 ahd_linux_dev_reset_complete(Scsi_Cmnd *cmd)
1480 {
1481         free(cmd, M_DEVBUF);
1482 }
1483
1484 /*
1485  * Attempt to send a target reset message to the device that timed out.
1486  */
1487 static int
1488 ahd_linux_dev_reset(Scsi_Cmnd *cmd)
1489 {
1490         struct  ahd_softc *ahd;
1491         struct  scsi_cmnd *recovery_cmd;
1492         struct  ahd_linux_device *dev;
1493         struct  ahd_initiator_tinfo *tinfo;
1494         struct  ahd_tmode_tstate *tstate;
1495         struct  scb *scb;
1496         struct  hardware_scb *hscb;
1497         u_long  s;
1498         struct  timer_list timer;
1499         int     retval;
1500
1501         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
1502         recovery_cmd = malloc(sizeof(struct scsi_cmnd), M_DEVBUF, M_WAITOK);
1503         if (!recovery_cmd)
1504                 return (FAILED);
1505         memset(recovery_cmd, 0, sizeof(struct scsi_cmnd));
1506         recovery_cmd->device = cmd->device;
1507         recovery_cmd->scsi_done = ahd_linux_dev_reset_complete;
1508 #if AHD_DEBUG
1509         if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
1510                 printf("%s:%d:%d:%d: Device reset called for cmd %p\n",
1511                        ahd_name(ahd), cmd->device->channel, cmd->device->id,
1512                        cmd->device->lun, cmd);
1513 #endif
1514         ahd_midlayer_entrypoint_lock(ahd, &s);
1515
1516         dev = ahd_linux_get_device(ahd, cmd->device->channel, cmd->device->id,
1517                                    cmd->device->lun, /*alloc*/FALSE);
1518         if (dev == NULL) {
1519                 ahd_midlayer_entrypoint_unlock(ahd, &s);
1520                 kfree(recovery_cmd);
1521                 return (FAILED);
1522         }
1523         if ((scb = ahd_get_scb(ahd, AHD_NEVER_COL_IDX)) == NULL) {
1524                 ahd_midlayer_entrypoint_unlock(ahd, &s);
1525                 kfree(recovery_cmd);
1526                 return (FAILED);
1527         }
1528         tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1529                                     cmd->device->id, &tstate);
1530         recovery_cmd->result = CAM_REQ_INPROG << 16;
1531         recovery_cmd->host_scribble = (char *)scb;
1532         scb->io_ctx = recovery_cmd;
1533         scb->platform_data->dev = dev;
1534         scb->sg_count = 0;
1535         ahd_set_residual(scb, 0);
1536         ahd_set_sense_residual(scb, 0);
1537         hscb = scb->hscb;
1538         hscb->control = 0;
1539         hscb->scsiid = BUILD_SCSIID(ahd, cmd);
1540         hscb->lun = cmd->device->lun;
1541         hscb->cdb_len = 0;
1542         hscb->task_management = SIU_TASKMGMT_LUN_RESET;
1543         scb->flags |= SCB_DEVICE_RESET|SCB_RECOVERY_SCB|SCB_ACTIVE;
1544         if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
1545                 scb->flags |= SCB_PACKETIZED;
1546         } else {
1547                 hscb->control |= MK_MESSAGE;
1548         }
1549         dev->openings--;
1550         dev->active++;
1551         dev->commands_issued++;
1552         LIST_INSERT_HEAD(&ahd->pending_scbs, scb, pending_links);
1553         ahd_queue_scb(ahd, scb);
1554
1555         scb->platform_data->flags |= AHD_SCB_UP_EH_SEM;
1556         spin_unlock_irq(&ahd->platform_data->spin_lock);
1557         init_timer(&timer);
1558         timer.data = (u_long)scb;
1559         timer.expires = jiffies + (5 * HZ);
1560         timer.function = ahd_linux_sem_timeout;
1561         add_timer(&timer);
1562         printf("Recovery code sleeping\n");
1563         down(&ahd->platform_data->eh_sem);
1564         printf("Recovery code awake\n");
1565         retval = SUCCESS;
1566         if (del_timer_sync(&timer) == 0) {
1567                 printf("Timer Expired\n");
1568                 retval = FAILED;
1569         }
1570         spin_lock_irq(&ahd->platform_data->spin_lock);
1571         ahd_schedule_runq(ahd);
1572         ahd_linux_run_complete_queue(ahd);
1573         ahd_midlayer_entrypoint_unlock(ahd, &s);
1574         printf("%s: Device reset returning 0x%x\n", ahd_name(ahd), retval);
1575         return (retval);
1576 }
1577
1578 /*
1579  * Reset the SCSI bus.
1580  */
1581 static int
1582 ahd_linux_bus_reset(Scsi_Cmnd *cmd)
1583 {
1584         struct ahd_softc *ahd;
1585         u_long s;
1586         int    found;
1587
1588         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
1589 #ifdef AHD_DEBUG
1590         if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
1591                 printf("%s: Bus reset called for cmd %p\n",
1592                        ahd_name(ahd), cmd);
1593 #endif
1594         ahd_midlayer_entrypoint_lock(ahd, &s);
1595         found = ahd_reset_channel(ahd, cmd->device->channel + 'A',
1596                                   /*initiate reset*/TRUE);
1597         ahd_linux_run_complete_queue(ahd);
1598         ahd_midlayer_entrypoint_unlock(ahd, &s);
1599
1600         if (bootverbose)
1601                 printf("%s: SCSI bus reset delivered. "
1602                        "%d SCBs aborted.\n", ahd_name(ahd), found);
1603
1604         return (SUCCESS);
1605 }
1606
1607 Scsi_Host_Template aic79xx_driver_template = {
1608         .module                 = THIS_MODULE,
1609         .name                   = "aic79xx",
1610         .proc_info              = ahd_linux_proc_info,
1611         .info                   = ahd_linux_info,
1612         .queuecommand           = ahd_linux_queue,
1613         .eh_abort_handler       = ahd_linux_abort,
1614         .eh_device_reset_handler = ahd_linux_dev_reset,
1615         .eh_bus_reset_handler   = ahd_linux_bus_reset,
1616 #if defined(__i386__)
1617         .bios_param             = ahd_linux_biosparam,
1618 #endif
1619         .can_queue              = AHD_MAX_QUEUE,
1620         .this_id                = -1,
1621         .cmd_per_lun            = 2,
1622         .use_clustering         = ENABLE_CLUSTERING,
1623         .slave_alloc            = ahd_linux_slave_alloc,
1624         .slave_configure        = ahd_linux_slave_configure,
1625         .slave_destroy          = ahd_linux_slave_destroy,
1626 };
1627
1628 /**************************** Tasklet Handler *********************************/
1629
1630 /*
1631  * In 2.4.X and above, this routine is called from a tasklet,
1632  * so we must re-acquire our lock prior to executing this code.
1633  * In all prior kernels, ahd_schedule_runq() calls this routine
1634  * directly and ahd_schedule_runq() is called with our lock held.
1635  */
1636 static void
1637 ahd_runq_tasklet(unsigned long data)
1638 {
1639         struct ahd_softc* ahd;
1640         struct ahd_linux_device *dev;
1641         u_long flags;
1642
1643         ahd = (struct ahd_softc *)data;
1644         ahd_lock(ahd, &flags);
1645         while ((dev = ahd_linux_next_device_to_run(ahd)) != NULL) {
1646         
1647                 TAILQ_REMOVE(&ahd->platform_data->device_runq, dev, links);
1648                 dev->flags &= ~AHD_DEV_ON_RUN_LIST;
1649                 ahd_linux_check_device_queue(ahd, dev);
1650                 /* Yeild to our interrupt handler */
1651                 ahd_unlock(ahd, &flags);
1652                 ahd_lock(ahd, &flags);
1653         }
1654         ahd_unlock(ahd, &flags);
1655 }
1656
1657 /******************************** Bus DMA *************************************/
1658 int
1659 ahd_dma_tag_create(struct ahd_softc *ahd, bus_dma_tag_t parent,
1660                    bus_size_t alignment, bus_size_t boundary,
1661                    dma_addr_t lowaddr, dma_addr_t highaddr,
1662                    bus_dma_filter_t *filter, void *filterarg,
1663                    bus_size_t maxsize, int nsegments,
1664                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
1665 {
1666         bus_dma_tag_t dmat;
1667
1668         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
1669         if (dmat == NULL)
1670                 return (ENOMEM);
1671
1672         /*
1673          * Linux is very simplistic about DMA memory.  For now don't
1674          * maintain all specification information.  Once Linux supplies
1675          * better facilities for doing these operations, or the
1676          * needs of this particular driver change, we might need to do
1677          * more here.
1678          */
1679         dmat->alignment = alignment;
1680         dmat->boundary = boundary;
1681         dmat->maxsize = maxsize;
1682         *ret_tag = dmat;
1683         return (0);
1684 }
1685
1686 void
1687 ahd_dma_tag_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat)
1688 {
1689         free(dmat, M_DEVBUF);
1690 }
1691
1692 int
1693 ahd_dmamem_alloc(struct ahd_softc *ahd, bus_dma_tag_t dmat, void** vaddr,
1694                  int flags, bus_dmamap_t *mapp)
1695 {
1696         bus_dmamap_t map;
1697
1698         map = malloc(sizeof(*map), M_DEVBUF, M_NOWAIT);
1699         if (map == NULL)
1700                 return (ENOMEM);
1701         /*
1702          * Although we can dma data above 4GB, our
1703          * "consistent" memory is below 4GB for
1704          * space efficiency reasons (only need a 4byte
1705          * address).  For this reason, we have to reset
1706          * our dma mask when doing allocations.
1707          */
1708         if (ahd->dev_softc != NULL)
1709                 if (pci_set_dma_mask(ahd->dev_softc, 0xFFFFFFFF)) {
1710                         printk(KERN_WARNING "aic79xx: No suitable DMA available.\n");
1711                         kfree(map);
1712                         return (ENODEV);
1713                 }
1714         *vaddr = pci_alloc_consistent(ahd->dev_softc,
1715                                       dmat->maxsize, &map->bus_addr);
1716         if (ahd->dev_softc != NULL)
1717                 if (pci_set_dma_mask(ahd->dev_softc,
1718                                      ahd->platform_data->hw_dma_mask)) {
1719                         printk(KERN_WARNING "aic79xx: No suitable DMA available.\n");
1720                         kfree(map);
1721                         return (ENODEV);
1722                 }
1723         if (*vaddr == NULL)
1724                 return (ENOMEM);
1725         *mapp = map;
1726         return(0);
1727 }
1728
1729 void
1730 ahd_dmamem_free(struct ahd_softc *ahd, bus_dma_tag_t dmat,
1731                 void* vaddr, bus_dmamap_t map)
1732 {
1733         pci_free_consistent(ahd->dev_softc, dmat->maxsize,
1734                             vaddr, map->bus_addr);
1735 }
1736
1737 int
1738 ahd_dmamap_load(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map,
1739                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
1740                 void *cb_arg, int flags)
1741 {
1742         /*
1743          * Assume for now that this will only be used during
1744          * initialization and not for per-transaction buffer mapping.
1745          */
1746         bus_dma_segment_t stack_sg;
1747
1748         stack_sg.ds_addr = map->bus_addr;
1749         stack_sg.ds_len = dmat->maxsize;
1750         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
1751         return (0);
1752 }
1753
1754 void
1755 ahd_dmamap_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
1756 {
1757         /*
1758          * The map may is NULL in our < 2.3.X implementation.
1759          */
1760         if (map != NULL)
1761                 free(map, M_DEVBUF);
1762 }
1763
1764 int
1765 ahd_dmamap_unload(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
1766 {
1767         /* Nothing to do */
1768         return (0);
1769 }
1770
1771 /********************* Platform Dependent Functions ***************************/
1772 /*
1773  * Compare "left hand" softc with "right hand" softc, returning:
1774  * < 0 - lahd has a lower priority than rahd
1775  *   0 - Softcs are equal
1776  * > 0 - lahd has a higher priority than rahd
1777  */
1778 int
1779 ahd_softc_comp(struct ahd_softc *lahd, struct ahd_softc *rahd)
1780 {
1781         int     value;
1782
1783         /*
1784          * Under Linux, cards are ordered as follows:
1785          *      1) PCI devices that are marked as the boot controller.
1786          *      2) PCI devices with BIOS enabled sorted by bus/slot/func.
1787          *      3) All remaining PCI devices sorted by bus/slot/func.
1788          */
1789 #if 0
1790         value = (lahd->flags & AHD_BOOT_CHANNEL)
1791               - (rahd->flags & AHD_BOOT_CHANNEL);
1792         if (value != 0)
1793                 /* Controllers set for boot have a *higher* priority */
1794                 return (value);
1795 #endif
1796
1797         value = (lahd->flags & AHD_BIOS_ENABLED)
1798               - (rahd->flags & AHD_BIOS_ENABLED);
1799         if (value != 0)
1800                 /* Controllers with BIOS enabled have a *higher* priority */
1801                 return (value);
1802
1803         /* Still equal.  Sort by bus/slot/func. */
1804         if (aic79xx_reverse_scan != 0)
1805                 value = ahd_get_pci_bus(lahd->dev_softc)
1806                       - ahd_get_pci_bus(rahd->dev_softc);
1807         else
1808                 value = ahd_get_pci_bus(rahd->dev_softc)
1809                       - ahd_get_pci_bus(lahd->dev_softc);
1810         if (value != 0)
1811                 return (value);
1812         if (aic79xx_reverse_scan != 0)
1813                 value = ahd_get_pci_slot(lahd->dev_softc)
1814                       - ahd_get_pci_slot(rahd->dev_softc);
1815         else
1816                 value = ahd_get_pci_slot(rahd->dev_softc)
1817                       - ahd_get_pci_slot(lahd->dev_softc);
1818         if (value != 0)
1819                 return (value);
1820
1821         value = rahd->channel - lahd->channel;
1822         return (value);
1823 }
1824
1825 static void
1826 ahd_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
1827 {
1828
1829         if ((instance >= 0) && (targ >= 0)
1830          && (instance < NUM_ELEMENTS(aic79xx_tag_info))
1831          && (targ < AHD_NUM_TARGETS)) {
1832                 aic79xx_tag_info[instance].tag_commands[targ] = value & 0x1FF;
1833                 if (bootverbose)
1834                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
1835         }
1836 }
1837
1838 static void
1839 ahd_linux_setup_rd_strm_info(u_long arg, int instance, int targ, int32_t value)
1840 {
1841         if ((instance >= 0)
1842          && (instance < NUM_ELEMENTS(aic79xx_rd_strm_info))) {
1843                 aic79xx_rd_strm_info[instance] = value & 0xFFFF;
1844                 if (bootverbose)
1845                         printf("rd_strm[%d] = 0x%x\n", instance, value);
1846         }
1847 }
1848
1849 static void
1850 ahd_linux_setup_dv(u_long arg, int instance, int targ, int32_t value)
1851 {
1852         if ((instance >= 0)
1853          && (instance < NUM_ELEMENTS(aic79xx_dv_settings))) {
1854                 aic79xx_dv_settings[instance] = value;
1855                 if (bootverbose)
1856                         printf("dv[%d] = %d\n", instance, value);
1857         }
1858 }
1859
1860 static void
1861 ahd_linux_setup_iocell_info(u_long index, int instance, int targ, int32_t value)
1862 {
1863
1864         if ((instance >= 0)
1865          && (instance < NUM_ELEMENTS(aic79xx_iocell_info))) {
1866                 uint8_t *iocell_info;
1867
1868                 iocell_info = (uint8_t*)&aic79xx_iocell_info[instance];
1869                 iocell_info[index] = value & 0xFFFF;
1870                 if (bootverbose)
1871                         printf("iocell[%d:%ld] = %d\n", instance, index, value);
1872         }
1873 }
1874
1875 static void
1876 ahd_linux_setup_tag_info_global(char *p)
1877 {
1878         int tags, i, j;
1879
1880         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
1881         printf("Setting Global Tags= %d\n", tags);
1882
1883         for (i = 0; i < NUM_ELEMENTS(aic79xx_tag_info); i++) {
1884                 for (j = 0; j < AHD_NUM_TARGETS; j++) {
1885                         aic79xx_tag_info[i].tag_commands[j] = tags;
1886                 }
1887         }
1888 }
1889
1890 /*
1891  * Handle Linux boot parameters. This routine allows for assigning a value
1892  * to a parameter with a ':' between the parameter and the value.
1893  * ie. aic79xx=stpwlev:1,extended
1894  */
1895 static int
1896 aic79xx_setup(char *s)
1897 {
1898         int     i, n;
1899         char   *p;
1900         char   *end;
1901
1902         static struct {
1903                 const char *name;
1904                 uint32_t *flag;
1905         } options[] = {
1906                 { "extended", &aic79xx_extended },
1907                 { "no_reset", &aic79xx_no_reset },
1908                 { "verbose", &aic79xx_verbose },
1909                 { "allow_memio", &aic79xx_allow_memio},
1910 #ifdef AHD_DEBUG
1911                 { "debug", &ahd_debug },
1912 #endif
1913                 { "reverse_scan", &aic79xx_reverse_scan },
1914                 { "periodic_otag", &aic79xx_periodic_otag },
1915                 { "pci_parity", &aic79xx_pci_parity },
1916                 { "seltime", &aic79xx_seltime },
1917                 { "tag_info", NULL },
1918                 { "global_tag_depth", NULL},
1919                 { "rd_strm", NULL },
1920                 { "dv", NULL },
1921                 { "slewrate", NULL },
1922                 { "precomp", NULL },
1923                 { "amplitude", NULL },
1924         };
1925
1926         end = strchr(s, '\0');
1927
1928         /*
1929          * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS
1930          * will never be 0 in this case.
1931          */      
1932         n = 0;  
1933
1934         while ((p = strsep(&s, ",.")) != NULL) {
1935                 if (*p == '\0')
1936                         continue;
1937                 for (i = 0; i < NUM_ELEMENTS(options); i++) {
1938
1939                         n = strlen(options[i].name);
1940                         if (strncmp(options[i].name, p, n) == 0)
1941                                 break;
1942                 }
1943                 if (i == NUM_ELEMENTS(options))
1944                         continue;
1945
1946                 if (strncmp(p, "global_tag_depth", n) == 0) {
1947                         ahd_linux_setup_tag_info_global(p + n);
1948                 } else if (strncmp(p, "tag_info", n) == 0) {
1949                         s = aic_parse_brace_option("tag_info", p + n, end,
1950                             2, ahd_linux_setup_tag_info, 0);
1951                 } else if (strncmp(p, "rd_strm", n) == 0) {
1952                         s = aic_parse_brace_option("rd_strm", p + n, end,
1953                             1, ahd_linux_setup_rd_strm_info, 0);
1954                 } else if (strncmp(p, "dv", n) == 0) {
1955                         s = aic_parse_brace_option("dv", p + n, end, 1,
1956                             ahd_linux_setup_dv, 0);
1957                 } else if (strncmp(p, "slewrate", n) == 0) {
1958                         s = aic_parse_brace_option("slewrate",
1959                             p + n, end, 1, ahd_linux_setup_iocell_info,
1960                             AIC79XX_SLEWRATE_INDEX);
1961                 } else if (strncmp(p, "precomp", n) == 0) {
1962                         s = aic_parse_brace_option("precomp",
1963                             p + n, end, 1, ahd_linux_setup_iocell_info,
1964                             AIC79XX_PRECOMP_INDEX);
1965                 } else if (strncmp(p, "amplitude", n) == 0) {
1966                         s = aic_parse_brace_option("amplitude",
1967                             p + n, end, 1, ahd_linux_setup_iocell_info,
1968                             AIC79XX_AMPLITUDE_INDEX);
1969                 } else if (p[n] == ':') {
1970                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1971                 } else if (!strncmp(p, "verbose", n)) {
1972                         *(options[i].flag) = 1;
1973                 } else {
1974                         *(options[i].flag) ^= 0xFFFFFFFF;
1975                 }
1976         }
1977         return 1;
1978 }
1979
1980 __setup("aic79xx=", aic79xx_setup);
1981
1982 uint32_t aic79xx_verbose;
1983
1984 int
1985 ahd_linux_register_host(struct ahd_softc *ahd, Scsi_Host_Template *template)
1986 {
1987         char    buf[80];
1988         struct  Scsi_Host *host;
1989         char    *new_name;
1990         u_long  s;
1991         u_long  target;
1992
1993         template->name = ahd->description;
1994         host = scsi_host_alloc(template, sizeof(struct ahd_softc *));
1995         if (host == NULL)
1996                 return (ENOMEM);
1997
1998         *((struct ahd_softc **)host->hostdata) = ahd;
1999         ahd_lock(ahd, &s);
2000 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
2001         scsi_assign_lock(host, &ahd->platform_data->spin_lock);
2002 #elif AHD_SCSI_HAS_HOST_LOCK != 0
2003         host->lock = &ahd->platform_data->spin_lock;
2004 #endif
2005         ahd->platform_data->host = host;
2006         host->can_queue = AHD_MAX_QUEUE;
2007         host->cmd_per_lun = 2;
2008         host->sg_tablesize = AHD_NSEG;
2009         host->this_id = ahd->our_id;
2010         host->irq = ahd->platform_data->irq;
2011         host->max_id = (ahd->features & AHD_WIDE) ? 16 : 8;
2012         host->max_lun = AHD_NUM_LUNS;
2013         host->max_channel = 0;
2014         host->sg_tablesize = AHD_NSEG;
2015         ahd_set_unit(ahd, ahd_linux_next_unit());
2016         sprintf(buf, "scsi%d", host->host_no);
2017         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
2018         if (new_name != NULL) {
2019                 strcpy(new_name, buf);
2020                 ahd_set_name(ahd, new_name);
2021         }
2022         host->unique_id = ahd->unit;
2023 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
2024         scsi_set_pci_device(host, ahd->dev_softc);
2025 #endif
2026         ahd_linux_setup_user_rd_strm_settings(ahd);
2027         ahd_linux_initialize_scsi_bus(ahd);
2028         ahd_unlock(ahd, &s);
2029         ahd->platform_data->dv_pid = kernel_thread(ahd_linux_dv_thread, ahd, 0);
2030         ahd_lock(ahd, &s);
2031         if (ahd->platform_data->dv_pid < 0) {
2032                 printf("%s: Failed to create DV thread, error= %d\n",
2033                        ahd_name(ahd), ahd->platform_data->dv_pid);
2034                 return (-ahd->platform_data->dv_pid);
2035         }
2036         /*
2037          * Initially allocate *all* of our linux target objects
2038          * so that the DV thread will scan them all in parallel
2039          * just after driver initialization.  Any device that
2040          * does not exist will have its target object destroyed
2041          * by the selection timeout handler.  In the case of a
2042          * device that appears after the initial DV scan, async
2043          * negotiation will occur for the first command, and DV
2044          * will comence should that first command be successful.
2045          */
2046         for (target = 0; target < host->max_id; target++) {
2047
2048                 /*
2049                  * Skip our own ID.  Some Compaq/HP storage devices
2050                  * have enclosure management devices that respond to
2051                  * single bit selection (i.e. selecting ourselves).
2052                  * It is expected that either an external application
2053                  * or a modified kernel will be used to probe this
2054                  * ID if it is appropriate.  To accommodate these
2055                  * installations, ahc_linux_alloc_target() will allocate
2056                  * for our ID if asked to do so.
2057                  */
2058                 if (target == ahd->our_id) 
2059                         continue;
2060
2061                 ahd_linux_alloc_target(ahd, 0, target);
2062         }
2063         ahd_intr_enable(ahd, TRUE);
2064         ahd_linux_start_dv(ahd);
2065         ahd_unlock(ahd, &s);
2066
2067 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
2068         scsi_add_host(host, &ahd->dev_softc->dev); /* XXX handle failure */
2069         scsi_scan_host(host);
2070 #endif
2071         return (0);
2072 }
2073
2074 uint64_t
2075 ahd_linux_get_memsize(void)
2076 {
2077         struct sysinfo si;
2078
2079         si_meminfo(&si);
2080         return ((uint64_t)si.totalram << PAGE_SHIFT);
2081 }
2082
2083 /*
2084  * Find the smallest available unit number to use
2085  * for a new device.  We don't just use a static
2086  * count to handle the "repeated hot-(un)plug"
2087  * scenario.
2088  */
2089 static int
2090 ahd_linux_next_unit(void)
2091 {
2092         struct ahd_softc *ahd;
2093         int unit;
2094
2095         unit = 0;
2096 retry:
2097         TAILQ_FOREACH(ahd, &ahd_tailq, links) {
2098                 if (ahd->unit == unit) {
2099                         unit++;
2100                         goto retry;
2101                 }
2102         }
2103         return (unit);
2104 }
2105
2106 /*
2107  * Place the SCSI bus into a known state by either resetting it,
2108  * or forcing transfer negotiations on the next command to any
2109  * target.
2110  */
2111 static void
2112 ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd)
2113 {
2114         u_int target_id;
2115         u_int numtarg;
2116
2117         target_id = 0;
2118         numtarg = 0;
2119
2120         if (aic79xx_no_reset != 0)
2121                 ahd->flags &= ~AHD_RESET_BUS_A;
2122
2123         if ((ahd->flags & AHD_RESET_BUS_A) != 0)
2124                 ahd_reset_channel(ahd, 'A', /*initiate_reset*/TRUE);
2125         else
2126                 numtarg = (ahd->features & AHD_WIDE) ? 16 : 8;
2127
2128         /*
2129          * Force negotiation to async for all targets that
2130          * will not see an initial bus reset.
2131          */
2132         for (; target_id < numtarg; target_id++) {
2133                 struct ahd_devinfo devinfo;
2134                 struct ahd_initiator_tinfo *tinfo;
2135                 struct ahd_tmode_tstate *tstate;
2136
2137                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
2138                                             target_id, &tstate);
2139                 ahd_compile_devinfo(&devinfo, ahd->our_id, target_id,
2140                                     CAM_LUN_WILDCARD, 'A', ROLE_INITIATOR);
2141                 ahd_update_neg_request(ahd, &devinfo, tstate,
2142                                        tinfo, AHD_NEG_ALWAYS);
2143         }
2144         /* Give the bus some time to recover */
2145         if ((ahd->flags & AHD_RESET_BUS_A) != 0) {
2146                 ahd_freeze_simq(ahd);
2147                 init_timer(&ahd->platform_data->reset_timer);
2148                 ahd->platform_data->reset_timer.data = (u_long)ahd;
2149                 ahd->platform_data->reset_timer.expires =
2150                     jiffies + (AIC79XX_RESET_DELAY * HZ)/1000;
2151                 ahd->platform_data->reset_timer.function =
2152                     (ahd_linux_callback_t *)ahd_release_simq;
2153                 add_timer(&ahd->platform_data->reset_timer);
2154         }
2155 }
2156
2157 int
2158 ahd_platform_alloc(struct ahd_softc *ahd, void *platform_arg)
2159 {
2160         ahd->platform_data =
2161             malloc(sizeof(struct ahd_platform_data), M_DEVBUF, M_NOWAIT);
2162         if (ahd->platform_data == NULL)
2163                 return (ENOMEM);
2164         memset(ahd->platform_data, 0, sizeof(struct ahd_platform_data));
2165         TAILQ_INIT(&ahd->platform_data->completeq);
2166         TAILQ_INIT(&ahd->platform_data->device_runq);
2167         ahd->platform_data->irq = AHD_LINUX_NOIRQ;
2168         ahd->platform_data->hw_dma_mask = 0xFFFFFFFF;
2169         ahd_lockinit(ahd);
2170         ahd_done_lockinit(ahd);
2171         init_timer(&ahd->platform_data->completeq_timer);
2172         ahd->platform_data->completeq_timer.data = (u_long)ahd;
2173         ahd->platform_data->completeq_timer.function =
2174             (ahd_linux_callback_t *)ahd_linux_thread_run_complete_queue;
2175         init_MUTEX_LOCKED(&ahd->platform_data->eh_sem);
2176         init_MUTEX_LOCKED(&ahd->platform_data->dv_sem);
2177         init_MUTEX_LOCKED(&ahd->platform_data->dv_cmd_sem);
2178         ahd_setup_runq_tasklet(ahd);
2179         ahd->seltime = (aic79xx_seltime & 0x3) << 4;
2180         return (0);
2181 }
2182
2183 void
2184 ahd_platform_free(struct ahd_softc *ahd)
2185 {
2186         struct ahd_linux_target *targ;
2187         struct ahd_linux_device *dev;
2188         int i, j;
2189
2190         if (ahd->platform_data != NULL) {
2191                 del_timer_sync(&ahd->platform_data->completeq_timer);
2192                 ahd_linux_kill_dv_thread(ahd);
2193                 ahd_teardown_runq_tasklet(ahd);
2194                 if (ahd->platform_data->host != NULL) {
2195 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
2196                         scsi_remove_host(ahd->platform_data->host);
2197 #endif
2198                         scsi_host_put(ahd->platform_data->host);
2199                 }
2200
2201                 /* destroy all of the device and target objects */
2202                 for (i = 0; i < AHD_NUM_TARGETS; i++) {
2203                         targ = ahd->platform_data->targets[i];
2204                         if (targ != NULL) {
2205                                 /* Keep target around through the loop. */
2206                                 targ->refcount++;
2207                                 for (j = 0; j < AHD_NUM_LUNS; j++) {
2208
2209                                         if (targ->devices[j] == NULL)
2210                                                 continue;
2211                                         dev = targ->devices[j];
2212                                         ahd_linux_free_device(ahd, dev);
2213                                 }
2214                                 /*
2215                                  * Forcibly free the target now that
2216                                  * all devices are gone.
2217                                  */
2218                                 ahd_linux_free_target(ahd, targ);
2219                         }
2220                 }
2221
2222                 if (ahd->platform_data->irq != AHD_LINUX_NOIRQ)
2223                         free_irq(ahd->platform_data->irq, ahd);
2224                 if (ahd->tags[0] == BUS_SPACE_PIO
2225                  && ahd->bshs[0].ioport != 0)
2226                         release_region(ahd->bshs[0].ioport, 256);
2227                 if (ahd->tags[1] == BUS_SPACE_PIO
2228                  && ahd->bshs[1].ioport != 0)
2229                         release_region(ahd->bshs[1].ioport, 256);
2230                 if (ahd->tags[0] == BUS_SPACE_MEMIO
2231                  && ahd->bshs[0].maddr != NULL) {
2232                         iounmap(ahd->bshs[0].maddr);
2233                         release_mem_region(ahd->platform_data->mem_busaddr,
2234                                            0x1000);
2235                 }
2236 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
2237                 /*
2238                  * In 2.4 we detach from the scsi midlayer before the PCI
2239                  * layer invokes our remove callback.  No per-instance
2240                  * detach is provided, so we must reach inside the PCI
2241                  * subsystem's internals and detach our driver manually.
2242                  */
2243                 if (ahd->dev_softc != NULL)
2244                         ahd->dev_softc->driver = NULL;
2245 #endif
2246                 free(ahd->platform_data, M_DEVBUF);
2247         }
2248 }
2249
2250 void
2251 ahd_platform_init(struct ahd_softc *ahd)
2252 {
2253         /*
2254          * Lookup and commit any modified IO Cell options.
2255          */
2256         if (ahd->unit < NUM_ELEMENTS(aic79xx_iocell_info)) {
2257                 struct ahd_linux_iocell_opts *iocell_opts;
2258
2259                 iocell_opts = &aic79xx_iocell_info[ahd->unit];
2260                 if (iocell_opts->precomp != AIC79XX_DEFAULT_PRECOMP)
2261                         AHD_SET_PRECOMP(ahd, iocell_opts->precomp);
2262                 if (iocell_opts->slewrate != AIC79XX_DEFAULT_SLEWRATE)
2263                         AHD_SET_SLEWRATE(ahd, iocell_opts->slewrate);
2264                 if (iocell_opts->amplitude != AIC79XX_DEFAULT_AMPLITUDE)
2265                         AHD_SET_AMPLITUDE(ahd, iocell_opts->amplitude);
2266         }
2267
2268 }
2269
2270 void
2271 ahd_platform_freeze_devq(struct ahd_softc *ahd, struct scb *scb)
2272 {
2273         ahd_platform_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
2274                                 SCB_GET_CHANNEL(ahd, scb),
2275                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
2276                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
2277 }
2278
2279 void
2280 ahd_platform_set_tags(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
2281                       ahd_queue_alg alg)
2282 {
2283         struct ahd_linux_device *dev;
2284         int was_queuing;
2285         int now_queuing;
2286
2287         dev = ahd_linux_get_device(ahd, devinfo->channel - 'A',
2288                                    devinfo->target,
2289                                    devinfo->lun, /*alloc*/FALSE);
2290         if (dev == NULL)
2291                 return;
2292         was_queuing = dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED);
2293         switch (alg) {
2294         default:
2295         case AHD_QUEUE_NONE:
2296                 now_queuing = 0;
2297                 break; 
2298         case AHD_QUEUE_BASIC:
2299                 now_queuing = AHD_DEV_Q_BASIC;
2300                 break;
2301         case AHD_QUEUE_TAGGED:
2302                 now_queuing = AHD_DEV_Q_TAGGED;
2303                 break;
2304         }
2305         if ((dev->flags & AHD_DEV_FREEZE_TIL_EMPTY) == 0
2306          && (was_queuing != now_queuing)
2307          && (dev->active != 0)) {
2308                 dev->flags |= AHD_DEV_FREEZE_TIL_EMPTY;
2309                 dev->qfrozen++;
2310         }
2311
2312         dev->flags &= ~(AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED|AHD_DEV_PERIODIC_OTAG);
2313         if (now_queuing) {
2314                 u_int usertags;
2315
2316                 usertags = ahd_linux_user_tagdepth(ahd, devinfo);
2317                 if (!was_queuing) {
2318                         /*
2319                          * Start out agressively and allow our
2320                          * dynamic queue depth algorithm to take
2321                          * care of the rest.
2322                          */
2323                         dev->maxtags = usertags;
2324                         dev->openings = dev->maxtags - dev->active;
2325                 }
2326                 if (dev->maxtags == 0) {
2327                         /*
2328                          * Queueing is disabled by the user.
2329                          */
2330                         dev->openings = 1;
2331                 } else if (alg == AHD_QUEUE_TAGGED) {
2332                         dev->flags |= AHD_DEV_Q_TAGGED;
2333                         if (aic79xx_periodic_otag != 0)
2334                                 dev->flags |= AHD_DEV_PERIODIC_OTAG;
2335                 } else
2336                         dev->flags |= AHD_DEV_Q_BASIC;
2337         } else {
2338                 /* We can only have one opening. */
2339                 dev->maxtags = 0;
2340                 dev->openings =  1 - dev->active;
2341         }
2342 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
2343         if (dev->scsi_device != NULL) {
2344                 switch ((dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED))) {
2345                 case AHD_DEV_Q_BASIC:
2346                         scsi_adjust_queue_depth(dev->scsi_device,
2347                                                 MSG_SIMPLE_TASK,
2348                                                 dev->openings + dev->active);
2349                         break;
2350                 case AHD_DEV_Q_TAGGED:
2351                         scsi_adjust_queue_depth(dev->scsi_device,
2352                                                 MSG_ORDERED_TASK,
2353                                                 dev->openings + dev->active);
2354                         break;
2355                 default:
2356                         /*
2357                          * We allow the OS to queue 2 untagged transactions to
2358                          * us at any time even though we can only execute them
2359                          * serially on the controller/device.  This should
2360                          * remove some latency.
2361                          */
2362                         scsi_adjust_queue_depth(dev->scsi_device,
2363                                                 /*NON-TAGGED*/0,
2364                                                 /*queue depth*/2);
2365                         break;
2366                 }
2367         }
2368 #endif
2369 }
2370
2371 int
2372 ahd_platform_abort_scbs(struct ahd_softc *ahd, int target, char channel,
2373                         int lun, u_int tag, role_t role, uint32_t status)
2374 {
2375         int targ;
2376         int maxtarg;
2377         int maxlun;
2378         int clun;
2379         int count;
2380
2381         if (tag != SCB_LIST_NULL)
2382                 return (0);
2383
2384         targ = 0;
2385         if (target != CAM_TARGET_WILDCARD) {
2386                 targ = target;
2387                 maxtarg = targ + 1;
2388         } else {
2389                 maxtarg = (ahd->features & AHD_WIDE) ? 16 : 8;
2390         }
2391         clun = 0;
2392         if (lun != CAM_LUN_WILDCARD) {
2393                 clun = lun;
2394                 maxlun = clun + 1;
2395         } else {
2396                 maxlun = AHD_NUM_LUNS;
2397         }
2398
2399         count = 0;
2400         for (; targ < maxtarg; targ++) {
2401
2402                 for (; clun < maxlun; clun++) {
2403                         struct ahd_linux_device *dev;
2404                         struct ahd_busyq *busyq;
2405                         struct ahd_cmd *acmd;
2406
2407                         dev = ahd_linux_get_device(ahd, /*chan*/0, targ,
2408                                                    clun, /*alloc*/FALSE);
2409                         if (dev == NULL)
2410                                 continue;
2411
2412                         busyq = &dev->busyq;
2413                         while ((acmd = TAILQ_FIRST(busyq)) != NULL) {
2414                                 Scsi_Cmnd *cmd;
2415
2416                                 cmd = &acmd_scsi_cmd(acmd);
2417                                 TAILQ_REMOVE(busyq, acmd,
2418                                              acmd_links.tqe);
2419                                 count++;
2420                                 cmd->result = status << 16;
2421                                 ahd_linux_queue_cmd_complete(ahd, cmd);
2422                         }
2423                 }
2424         }
2425
2426         return (count);
2427 }
2428
2429 static void
2430 ahd_linux_thread_run_complete_queue(struct ahd_softc *ahd)
2431 {
2432         u_long flags;
2433
2434         ahd_lock(ahd, &flags);
2435         del_timer(&ahd->platform_data->completeq_timer);
2436         ahd->platform_data->flags &= ~AHD_RUN_CMPLT_Q_TIMER;
2437         ahd_linux_run_complete_queue(ahd);
2438         ahd_unlock(ahd, &flags);
2439 }
2440
2441 static void
2442 ahd_linux_start_dv(struct ahd_softc *ahd)
2443 {
2444
2445         /*
2446          * Freeze the simq and signal ahd_linux_queue to not let any
2447          * more commands through
2448          */
2449         if ((ahd->platform_data->flags & AHD_DV_ACTIVE) == 0) {
2450 #ifdef AHD_DEBUG
2451                 if (ahd_debug & AHD_SHOW_DV)
2452                         printf("%s: Starting DV\n", ahd_name(ahd));
2453 #endif
2454
2455                 ahd->platform_data->flags |= AHD_DV_ACTIVE;
2456                 ahd_freeze_simq(ahd);
2457
2458                 /* Wake up the DV kthread */
2459                 up(&ahd->platform_data->dv_sem);
2460         }
2461 }
2462
2463 static int
2464 ahd_linux_dv_thread(void *data)
2465 {
2466         struct  ahd_softc *ahd;
2467         int     target;
2468         u_long  s;
2469
2470         ahd = (struct ahd_softc *)data;
2471
2472 #ifdef AHD_DEBUG
2473         if (ahd_debug & AHD_SHOW_DV)
2474                 printf("In DV Thread\n");
2475 #endif
2476
2477         /*
2478          * Complete thread creation.
2479          */
2480         lock_kernel();
2481 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,60)
2482         /*
2483          * Don't care about any signals.
2484          */
2485         siginitsetinv(&current->blocked, 0);
2486
2487         daemonize();
2488         sprintf(current->comm, "ahd_dv_%d", ahd->unit);
2489 #else
2490         daemonize("ahd_dv_%d", ahd->unit);
2491         current->flags |= PF_NOFREEZE;
2492 #endif
2493         unlock_kernel();
2494
2495         while (1) {
2496                 /*
2497                  * Use down_interruptible() rather than down() to
2498                  * avoid inclusion in the load average.
2499                  */
2500                 down_interruptible(&ahd->platform_data->dv_sem);
2501
2502                 /* Check to see if we've been signaled to exit */
2503                 ahd_lock(ahd, &s);
2504                 if ((ahd->platform_data->flags & AHD_DV_SHUTDOWN) != 0) {
2505                         ahd_unlock(ahd, &s);
2506                         break;
2507                 }
2508                 ahd_unlock(ahd, &s);
2509
2510 #ifdef AHD_DEBUG
2511                 if (ahd_debug & AHD_SHOW_DV)
2512                         printf("%s: Beginning Domain Validation\n",
2513                                ahd_name(ahd));
2514 #endif
2515
2516                 /*
2517                  * Wait for any pending commands to drain before proceeding.
2518                  */
2519                 ahd_lock(ahd, &s);
2520                 while (LIST_FIRST(&ahd->pending_scbs) != NULL) {
2521                         ahd->platform_data->flags |= AHD_DV_WAIT_SIMQ_EMPTY;
2522                         ahd_unlock(ahd, &s);
2523                         down_interruptible(&ahd->platform_data->dv_sem);
2524                         ahd_lock(ahd, &s);
2525                 }
2526
2527                 /*
2528                  * Wait for the SIMQ to be released so that DV is the
2529                  * only reason the queue is frozen.
2530                  */
2531                 while (AHD_DV_SIMQ_FROZEN(ahd) == 0) {
2532                         ahd->platform_data->flags |= AHD_DV_WAIT_SIMQ_RELEASE;
2533                         ahd_unlock(ahd, &s);
2534                         down_interruptible(&ahd->platform_data->dv_sem);
2535                         ahd_lock(ahd, &s);
2536                 }
2537                 ahd_unlock(ahd, &s);
2538
2539                 for (target = 0; target < AHD_NUM_TARGETS; target++)
2540                         ahd_linux_dv_target(ahd, target);
2541
2542                 ahd_lock(ahd, &s);
2543                 ahd->platform_data->flags &= ~AHD_DV_ACTIVE;
2544                 ahd_unlock(ahd, &s);
2545
2546                 /*
2547                  * Release the SIMQ so that normal commands are
2548                  * allowed to continue on the bus.
2549                  */
2550                 ahd_release_simq(ahd);
2551         }
2552         up(&ahd->platform_data->eh_sem);
2553         return (0);
2554 }
2555
2556 static void
2557 ahd_linux_kill_dv_thread(struct ahd_softc *ahd)
2558 {
2559         u_long s;
2560
2561         ahd_lock(ahd, &s);
2562         if (ahd->platform_data->dv_pid != 0) {
2563                 ahd->platform_data->flags |= AHD_DV_SHUTDOWN;
2564                 ahd_unlock(ahd, &s);
2565                 up(&ahd->platform_data->dv_sem);
2566
2567                 /*
2568                  * Use the eh_sem as an indicator that the
2569                  * dv thread is exiting.  Note that the dv
2570                  * thread must still return after performing
2571                  * the up on our semaphore before it has
2572                  * completely exited this module.  Unfortunately,
2573                  * there seems to be no easy way to wait for the
2574                  * exit of a thread for which you are not the
2575                  * parent (dv threads are parented by init).
2576                  * Cross your fingers...
2577                  */
2578                 down(&ahd->platform_data->eh_sem);
2579
2580                 /*
2581                  * Mark the dv thread as already dead.  This
2582                  * avoids attempting to kill it a second time.
2583                  * This is necessary because we must kill the
2584                  * DV thread before calling ahd_free() in the
2585                  * module shutdown case to avoid bogus locking
2586                  * in the SCSI mid-layer, but we ahd_free() is
2587                  * called without killing the DV thread in the
2588                  * instance detach case, so ahd_platform_free()
2589                  * calls us again to verify that the DV thread
2590                  * is dead.
2591                  */
2592                 ahd->platform_data->dv_pid = 0;
2593         } else {
2594                 ahd_unlock(ahd, &s);
2595         }
2596 }
2597
2598 #define AHD_LINUX_DV_INQ_SHORT_LEN      36
2599 #define AHD_LINUX_DV_INQ_LEN            256
2600 #define AHD_LINUX_DV_TIMEOUT            (HZ / 4)
2601
2602 #define AHD_SET_DV_STATE(ahd, targ, newstate) \
2603         ahd_set_dv_state(ahd, targ, newstate, __LINE__)
2604
2605 static __inline void
2606 ahd_set_dv_state(struct ahd_softc *ahd, struct ahd_linux_target *targ,
2607                  ahd_dv_state newstate, u_int line)
2608 {
2609         ahd_dv_state oldstate;
2610
2611         oldstate = targ->dv_state;
2612 #ifdef AHD_DEBUG
2613         if (ahd_debug & AHD_SHOW_DV)
2614                 printf("%s:%d: Going from state %d to state %d\n",
2615                        ahd_name(ahd), line, oldstate, newstate);
2616 #endif
2617
2618         if (oldstate == newstate)
2619                 targ->dv_state_retry++;
2620         else
2621                 targ->dv_state_retry = 0;
2622         targ->dv_state = newstate;
2623 }
2624
2625 static void
2626 ahd_linux_dv_target(struct ahd_softc *ahd, u_int target_offset)
2627 {
2628         struct   ahd_devinfo devinfo;
2629         struct   ahd_linux_target *targ;
2630         struct   scsi_cmnd *cmd;
2631         struct   scsi_device *scsi_dev;
2632         struct   scsi_sense_data *sense;
2633         uint8_t *buffer;
2634         u_long   s;
2635         u_int    timeout;
2636         int      echo_size;
2637
2638         sense = NULL;
2639         buffer = NULL;
2640         echo_size = 0;
2641         ahd_lock(ahd, &s);
2642         targ = ahd->platform_data->targets[target_offset];
2643         if (targ == NULL || (targ->flags & AHD_DV_REQUIRED) == 0) {
2644                 ahd_unlock(ahd, &s);
2645                 return;
2646         }
2647         ahd_compile_devinfo(&devinfo, ahd->our_id, targ->target, /*lun*/0,
2648                             targ->channel + 'A', ROLE_INITIATOR);
2649 #ifdef AHD_DEBUG
2650         if (ahd_debug & AHD_SHOW_DV) {
2651                 ahd_print_devinfo(ahd, &devinfo);
2652                 printf("Performing DV\n");
2653         }
2654 #endif
2655
2656         ahd_unlock(ahd, &s);
2657
2658         cmd = malloc(sizeof(struct scsi_cmnd), M_DEVBUF, M_WAITOK);
2659         scsi_dev = malloc(sizeof(struct scsi_device), M_DEVBUF, M_WAITOK);
2660         scsi_dev->host = ahd->platform_data->host;
2661         scsi_dev->id = devinfo.target;
2662         scsi_dev->lun = devinfo.lun;
2663         scsi_dev->channel = devinfo.channel - 'A';
2664         ahd->platform_data->dv_scsi_dev = scsi_dev;
2665
2666         AHD_SET_DV_STATE(ahd, targ, AHD_DV_STATE_INQ_SHORT_ASYNC);
2667
2668         while (targ->dv_state != AHD_DV_STATE_EXIT) {
2669                 timeout = AHD_LINUX_DV_TIMEOUT;
2670                 switch (targ->dv_state) {
2671                 case AHD_DV_STATE_INQ_SHORT_ASYNC:
2672                 case AHD_DV_STATE_INQ_ASYNC:
2673                 case AHD_DV_STATE_INQ_ASYNC_VERIFY:
2674                         /*
2675                          * Set things to async narrow to reduce the
2676                          * chance that the INQ will fail.
2677                          */
2678                         ahd_lock(ahd, &s);
2679                         ahd_set_syncrate(ahd, &devinfo, 0, 0, 0,
2680                                          AHD_TRANS_GOAL, /*paused*/FALSE);
2681                         ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
2682                                       AHD_TRANS_GOAL, /*paused*/FALSE);
2683                         ahd_unlock(ahd, &s);
2684                         timeout = 10 * HZ;
2685                         targ->flags &= ~AHD_INQ_VALID;
2686                         /* FALLTHROUGH */
2687                 case AHD_DV_STATE_INQ_VERIFY:
2688                 {
2689                         u_int inq_len;
2690
2691                         if (targ->dv_state == AHD_DV_STATE_INQ_SHORT_ASYNC)
2692                                 inq_len = AHD_LINUX_DV_INQ_SHORT_LEN;
2693                         else
2694                                 inq_len = targ->inq_data->additional_length + 5;
2695                         ahd_linux_dv_inq(ahd, cmd, &devinfo, targ, inq_len);
2696                         break;
2697                 }
2698                 case AHD_DV_STATE_TUR:
2699                 case AHD_DV_STATE_BUSY:
2700                         timeout = 5 * HZ;
2701                         ahd_linux_dv_tur(ahd, cmd, &devinfo);
2702                         break;
2703                 case AHD_DV_STATE_REBD:
2704                         ahd_linux_dv_rebd(ahd, cmd, &devinfo, targ);
2705                         break;
2706                 case AHD_DV_STATE_WEB:
2707                         ahd_linux_dv_web(ahd, cmd, &devinfo, targ);
2708                         break;
2709
2710                 case AHD_DV_STATE_REB:
2711                         ahd_linux_dv_reb(ahd, cmd, &devinfo, targ);
2712                         break;
2713
2714                 case AHD_DV_STATE_SU:
2715                         ahd_linux_dv_su(ahd, cmd, &devinfo, targ);
2716                         timeout = 50 * HZ;
2717                         break;
2718
2719                 default:
2720                         ahd_print_devinfo(ahd, &devinfo);
2721                         printf("Unknown DV state %d\n", targ->dv_state);
2722                         goto out;
2723                 }
2724
2725                 /* Queue the command and wait for it to complete */
2726                 /* Abuse eh_timeout in the scsi_cmnd struct for our purposes */
2727                 init_timer(&cmd->eh_timeout);
2728 #ifdef AHD_DEBUG
2729                 if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
2730                         /*
2731                          * All of the printfs during negotiation
2732                          * really slow down the negotiation.
2733                          * Add a bit of time just to be safe.
2734                          */
2735                         timeout += HZ;
2736 #endif
2737                 scsi_add_timer(cmd, timeout, ahd_linux_dv_timeout);
2738                 /*
2739                  * In 2.5.X, it is assumed that all calls from the
2740                  * "midlayer" (which we are emulating) will have the
2741                  * ahd host lock held.  For other kernels, the
2742                  * io_request_lock must be held.
2743                  */
2744 #if AHD_SCSI_HAS_HOST_LOCK != 0
2745                 ahd_lock(ahd, &s);
2746 #else
2747                 spin_lock_irqsave(&io_request_lock, s);
2748 #endif
2749                 ahd_linux_queue(cmd, ahd_linux_dv_complete);
2750 #if AHD_SCSI_HAS_HOST_LOCK != 0
2751                 ahd_unlock(ahd, &s);
2752 #else
2753                 spin_unlock_irqrestore(&io_request_lock, s);
2754 #endif
2755                 down_interruptible(&ahd->platform_data->dv_cmd_sem);
2756                 /*
2757                  * Wait for the SIMQ to be released so that DV is the
2758                  * only reason the queue is frozen.
2759                  */
2760                 ahd_lock(ahd, &s);
2761                 while (AHD_DV_SIMQ_FROZEN(ahd) == 0) {
2762                         ahd->platform_data->flags |= AHD_DV_WAIT_SIMQ_RELEASE;
2763                         ahd_unlock(ahd, &s);
2764                         down_interruptible(&ahd->platform_data->dv_sem);
2765                         ahd_lock(ahd, &s);
2766                 }
2767                 ahd_unlock(ahd, &s);
2768
2769                 ahd_linux_dv_transition(ahd, cmd, &devinfo, targ);
2770         }
2771
2772 out:
2773         if ((targ->flags & AHD_INQ_VALID) != 0
2774          && ahd_linux_get_device(ahd, devinfo.channel - 'A',
2775                                  devinfo.target, devinfo.lun,
2776                                  /*alloc*/FALSE) == NULL) {
2777                 /*
2778                  * The DV state machine failed to configure this device.  
2779                  * This is normal if DV is disabled.  Since we have inquiry
2780                  * data, filter it and use the "optimistic" negotiation
2781                  * parameters found in the inquiry string.
2782                  */
2783                 ahd_linux_filter_inquiry(ahd, &devinfo);
2784                 if ((targ->flags & (AHD_BASIC_DV|AHD_ENHANCED_DV)) != 0) {
2785                         ahd_print_devinfo(ahd, &devinfo);
2786                         printf("DV failed to configure device.  "
2787                                "Please file a bug report against "
2788                                "this driver.\n");
2789                 }
2790         }
2791
2792         if (cmd != NULL)
2793                 free(cmd, M_DEVBUF);
2794
2795         if (ahd->platform_data->dv_scsi_dev != NULL) {
2796                 free(ahd->platform_data->dv_scsi_dev, M_DEVBUF);
2797                 ahd->platform_data->dv_scsi_dev = NULL;
2798         }
2799
2800         ahd_lock(ahd, &s);
2801         if (targ->dv_buffer != NULL) {
2802                 free(targ->dv_buffer, M_DEVBUF);
2803                 targ->dv_buffer = NULL;
2804         }
2805         if (targ->dv_buffer1 != NULL) {
2806                 free(targ->dv_buffer1, M_DEVBUF);
2807                 targ->dv_buffer1 = NULL;
2808         }
2809         targ->flags &= ~AHD_DV_REQUIRED;
2810         if (targ->refcount == 0)
2811                 ahd_linux_free_target(ahd, targ);
2812         ahd_unlock(ahd, &s);
2813 }
2814
2815 static __inline int
2816 ahd_linux_dv_fallback(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
2817 {
2818         u_long s;
2819         int retval;
2820
2821         ahd_lock(ahd, &s);
2822         retval = ahd_linux_fallback(ahd, devinfo);
2823         ahd_unlock(ahd, &s);
2824
2825         return (retval);
2826 }
2827
2828 static void
2829 ahd_linux_dv_transition(struct ahd_softc *ahd, struct scsi_cmnd *cmd,
2830                         struct ahd_devinfo *devinfo,
2831                         struct ahd_linux_target *targ)
2832 {
2833         u_int32_t status;
2834
2835         status = aic_error_action(cmd, targ->inq_data,
2836                                   ahd_cmd_get_transaction_status(cmd),
2837                                   ahd_cmd_get_scsi_status(cmd));
2838
2839         
2840 #ifdef AHD_DEBUG
2841         if (ahd_debug & AHD_SHOW_DV) {
2842                 ahd_print_devinfo(ahd, devinfo);
2843                 printf("Entering ahd_linux_dv_transition, state= %d, "
2844                        "status= 0x%x, cmd->result= 0x%x\n", targ->dv_state,
2845                        status, cmd->result);
2846         }
2847 #endif
2848
2849         switch (targ->dv_state) {
2850         case AHD_DV_STATE_INQ_SHORT_ASYNC:
2851         case AHD_DV_STATE_INQ_ASYNC:
2852                 switch (status & SS_MASK) {
2853                 case SS_NOP:
2854                 {
2855                         AHD_SET_DV_STATE(ahd, targ, targ->dv_state+1);
2856                         break;
2857                 }
2858                 case SS_INQ_REFRESH:
2859                         AHD_SET_DV_STATE(ahd, targ,
2860                                          AHD_DV_STATE_INQ_SHORT_ASYNC);
2861                         break;
2862                 case SS_TUR:
2863                 case SS_RETRY:
2864                         AHD_SET_DV_STATE(ahd, targ, targ->dv_state);
2865                         if (ahd_cmd_get_transaction_status(cmd)
2866                          == CAM_REQUEUE_REQ)
2867                                 targ->dv_state_retry--;
2868                         if ((status & SS_ERRMASK) == EBUSY)
2869                                 AHD_SET_DV_STATE(ahd, targ, AHD_DV_STATE_BUSY);
2870                         if (targ->dv_state_retry < 10)
2871                                 break;
2872                         /* FALLTHROUGH */
2873                 default:
2874                         AHD_SET_DV_STATE(ahd, targ, AHD_DV_STATE_EXIT);
2875 #ifdef AHD_DEBUG
2876                         if (ahd_debug & AHD_SHOW_DV) {
2877                                 ahd_print_devinfo(ahd, devinfo);
2878                                 printf("Failed DV inquiry, skipping\n");
2879                         }
2880 #endif
2881                         break;
2882                 }
2883                 break;
2884         case AHD_DV_STATE_INQ_ASYNC_VERIFY:
2885                 switch (status & SS_MASK) {
2886                 case SS_NOP:
2887                 {
2888                         u_int xportflags;
2889                         u_int spi3data;
2890
2891                         if (memcmp(targ->inq_data, targ->dv_buffer,
2892                                    AHD_LINUX_DV_INQ_LEN) != 0) {
2893                                 /*
2894                                  * Inquiry data must have changed.
2895                                  * Try from the top again.
2896                                  */
2897                                 AHD_SET_DV_STATE(ahd, targ,
2898                                                  AHD_DV_STATE_INQ_SHORT_ASYNC);
2899                                 break;
2900                         }
2901
2902                         AHD_SET_DV_STATE(ahd, targ, targ->dv_state+1);
2903                         targ->flags |= AHD_INQ_VALID;
2904                         if (ahd_linux_user_dv_setting(ahd) == 0)
2905                                 break;
2906
2907                         xportflags = targ->inq_data->flags;
2908                         if ((xportflags & (SID_Sync|SID_WBus16)) == 0)
2909                                 break;
2910
2911                         spi3data = targ->inq_data->spi3data;
2912                         switch (spi3data & SID_SPI_CLOCK_DT_ST) {
2913                         default:
2914                         case SID_SPI_CLOCK_ST:
2915                                 /* Assume only basic DV is supported. */
2916                                 targ->flags |= AHD_BASIC_DV;
2917                                 break;
2918                         case SID_SPI_CLOCK_DT:
2919                         case SID_SPI_CLOCK_DT_ST:
2920                                 targ->flags |= AHD_ENHANCED_DV;
2921                                 break;
2922                         }
2923                         break;
2924                 }
2925                 case SS_INQ_REFRESH:
2926                         AHD_SET_DV_STATE(ahd, targ,
2927                                          AHD_DV_STATE_INQ_SHORT_ASYNC);
2928                         break;
2929                 case SS_TUR:
2930                 case SS_RETRY:
2931                         AHD_SET_DV_STATE(ahd, targ, targ->dv_state);
2932                         if (ahd_cmd_get_transaction_status(cmd)
2933                          == CAM_REQUEUE_REQ)
2934                                 targ->dv_state_retry--;
2935
2936                         if ((status & SS_ERRMASK) == EBUSY)
2937                                 AHD_SET_DV_STATE(ahd, targ, AHD_DV_STATE_BUSY);
2938                         if (targ->dv_state_retry < 10)
2939                                 break;
2940                         /* FALLTHROUGH */
2941                 default:
2942                         AHD_SET_DV_STATE(ahd, targ, AHD_DV_STATE_EXIT);
2943 #ifdef AHD_DEBUG
2944                         if (ahd_debug & AHD_SHOW_DV) {
2945                                 ahd_print_devinfo(ahd, devinfo);
2946                                 printf("Failed DV inquiry, skipping\n");
2947                         }
2948 #endif
2949                         break;
2950                 }
2951                 break;
2952         case AHD_DV_STATE_INQ_VERIFY:
2953                 switch (status & SS_MASK) {
2954                 case SS_NOP:
2955                 {
2956
2957                         if (memcmp(targ->inq_data, targ->dv_buffer,
2958                                    AHD_LINUX_DV_INQ_LEN) == 0) {
2959                                 AHD_SET_DV_STATE(ahd, targ, AHD_DV_STATE_EXIT);
2960                                 break;
2961                         }
2962
2963 #ifdef AHD_DEBUG
2964                         if (ahd_debug & AHD_SHOW_DV) {
2965                                 int i;
2966
2967                                 ahd_print_devinfo(ahd, devinfo);
2968                                 printf("Inquiry buffer mismatch:");
2969                                 for (i = 0; i < AHD_LINUX_DV_INQ_LEN; i++) {
2970                                         if ((i & 0xF) == 0)
2971                                                 printf("\n        ");
2972                                         printf("0x%x:0x0%x ",
2973                                                ((uint8_t *)targ->inq_data)[i], 
2974                                                targ->dv_buffer[i]);
2975                                 }
2976                                 printf("\n");
2977                         }
2978 #endif
2979
2980                         if (ahd_linux_dv_fallback(ahd, devinfo) != 0) {
2981                                 AHD_SET_DV_STATE(ahd, targ, AHD_DV_STATE_EXIT);
2982                                 break;
2983                         }
2984                         /*
2985                          * Do not count "falling back"
2986                          * against our retries.
2987                          */
2988                         targ->dv_state_retry = 0;
2989                         AHD_SET_DV_STATE(ahd, targ, targ->dv_state);
2990                         break;
2991                 }
2992                 case SS_INQ_REFRESH:
2993                         AHD_SET_DV_STATE(ahd, targ,
2994                                          AHD_DV_STATE_INQ_SHORT_ASYNC);
2995                         break;
2996                 case SS_TUR:
2997                 case SS_RETRY:
2998                         AHD_SET_DV_STATE(ahd, targ, targ->dv_state);
2999                         if (ahd_cmd_get_transaction_status(cmd)
3000                          == CAM_REQUEUE_REQ) {
3001                                 targ->dv_state_retry--;
3002                         } else if ((status & SSQ_FALLBACK) != 0) {
3003                                 if (ahd_linux_dv_fallback(ahd, devinfo) != 0) {
3004                                         AHD_SET_DV_STATE(ahd, targ,
3005                                                          AHD_DV_STATE_EXIT);
3006                                         break;
3007                                 }
3008                                 /*
3009                                  * Do not count "falling back"
3010                                  * against our retries.
3011                                  */
3012                                 targ->dv_state_retry = 0;
3013                         } else if ((status & SS_ERRMASK) == EBUSY)
3014                                 AHD_SET_DV_STATE(ahd, targ, AHD_DV_STATE_BUSY);
3015                         if (targ->dv_state_retry < 10)
3016                                 break;
3017                         /* FALLTHROUGH */
3018                 default:
3019                         AHD_SET_DV_STATE(ahd, targ, AHD_DV_STATE_EXIT);
3020 #ifdef AHD_DEBUG
3021                         if (ahd_debug & AHD_SHOW_DV) {
3022                                 ahd_print_devinfo(ahd, devinfo);
3023                                 printf("Failed DV inquiry, skipping\n");
3024                         }
3025 #endif
3026                         break;
3027                 }
3028                 break;
3029
3030         case AHD_DV_STATE_TUR:
3031                 switch (status & SS_MASK) {
3032                 case SS_NOP:
3033                         if ((targ->flags & AHD_BASIC_DV) != 0) {
3034                                 ahd_linux_filter_inquiry(ahd, devinfo);
3035                                 AHD_SET_DV_STATE(ahd, targ,
3036                                                  AHD_DV_STATE_INQ_VERIFY);
3037                         } else if ((targ->flags & AHD_ENHANCED_DV) != 0) {
3038                                 AHD_SET_DV_STATE(ahd, targ, AHD_DV_STATE_REBD);
3039                         } else {
3040                                 AHD_SET_DV_STATE(ahd, targ, AHD_DV_STATE_EXIT);
3041                         }
3042                         break;
3043                 case SS_RETRY:
3044                 case SS_TUR:
3045                         if ((status & SS_ERRMASK) == EBUSY) {
3046                                 AHD_SET_DV_STATE(ahd, targ, AHD_DV_STATE_BUSY);
3047                                 break;
3048                         }
3049                         AHD_SET_DV_STATE(ahd, targ, targ->dv_state);
3050                         if (ahd_cmd_get_transaction_status(cmd)
3051                          == CAM_REQUEUE_REQ) {
3052                                 targ->dv_state_retry--;
3053                         } else if ((status & SSQ_FALLBACK) != 0) {
3054                                 if (ahd_linux_dv_fallback(ahd, devinfo) != 0) {
3055                                         AHD_SET_DV_STATE(ahd, targ,
3056                                                          AHD_DV_STATE_EXIT);
3057                                         break;
3058                                 }
3059                                 /*
3060                                  * Do not count "falling back"
3061                                  * against our retries.
3062                                  */
3063                                 targ->dv_state_retry = 0;
3064                         }
3065                         if (targ->dv_state_retry >= 10) {
3066 #ifdef AHD_DEBUG
3067                                 if (ahd_debug & AHD_SHOW_DV) {
3068                                         ahd_print_devinfo(ahd, devinfo);
3069                                         printf("DV TUR reties exhausted\n");
3070                                 }
3071 #endif
3072                                 AHD_SET_DV_STATE(ahd, targ, AHD_DV_STATE_EXIT);
3073                                 break;
3074                         }
3075                         if (status & SSQ_DELAY)
3076                                 ssleep(1);
3077
3078                         break;
3079                 case SS_START:
3080                         AHD_SET_DV_STATE(ahd, targ, AHD_DV_STATE_SU);
3081                         break;
3082                 case SS_INQ_REFRESH:
3083                         AHD_SET_DV_STATE(ahd, targ,
3084                                          AHD_DV_STATE_INQ_SHORT_ASYNC);
3085                         break;
3086                 default:
3087                         AHD_SET_DV_STATE(ahd, targ, AHD_DV_STATE_EXIT);
3088                         break;
3089                 }
3090                 break;
3091
3092         case AHD_DV_STATE_REBD:
3093                 switch (status & SS_MASK) {
3094                 case SS_NOP:
3095                 {