2 * linux/drivers/scsi/ide-scsi.c Version 0.9 Jul 4, 1999
4 * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
8 * Emulation of a SCSI host adapter for IDE ATAPI devices.
10 * With this driver, one can use the Linux SCSI drivers instead of the
11 * native IDE ATAPI drivers.
13 * Ver 0.1 Dec 3 96 Initial version.
14 * Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation
15 * of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
16 * to Janos Farkas for pointing this out.
17 * Avoid using bitfields in structures for m68k.
18 * Added Scatter/Gather and DMA support.
19 * Ver 0.4 Dec 7 97 Add support for ATAPI PD/CD drives.
20 * Use variable timeout for each command.
21 * Ver 0.5 Jan 2 98 Fix previous PD/CD support.
22 * Allow disabling of SCSI-6 to SCSI-10 transformation.
23 * Ver 0.6 Jan 27 98 Allow disabling of SCSI command translation layer
24 * for access through /dev/sg.
25 * Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
26 * Ver 0.7 Dec 04 98 Ignore commands where lun != 0 to avoid multiple
27 * detection of devices with CONFIG_SCSI_MULTI_LUN
28 * Ver 0.8 Feb 05 99 Optical media need translation too. Reverse 0.7.
29 * Ver 0.9 Jul 04 99 Fix a bug in SG_SET_TRANSFORM.
30 * Ver 0.91 Jun 10 02 Fix "off by one" error in transforms
31 * Ver 0.92 Dec 31 02 Implement new SCSI mid level API
34 #define IDESCSI_VERSION "0.92"
36 #include <linux/module.h>
37 #include <linux/config.h>
38 #include <linux/types.h>
39 #include <linux/string.h>
40 #include <linux/kernel.h>
42 #include <linux/ioport.h>
43 #include <linux/blkdev.h>
44 #include <linux/errno.h>
45 #include <linux/hdreg.h>
46 #include <linux/slab.h>
47 #include <linux/ide.h>
48 #include <linux/scatterlist.h>
51 #include <asm/bitops.h>
52 #include <asm/uaccess.h>
54 #include <scsi/scsi.h>
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_device.h>
57 #include <scsi/scsi_host.h>
58 #include <scsi/scsi_tcq.h>
61 #define IDESCSI_DEBUG_LOG 0
63 typedef struct idescsi_pc_s
{
64 u8 c
[12]; /* Actual packet bytes */
65 int request_transfer
; /* Bytes to transfer */
66 int actually_transferred
; /* Bytes actually transferred */
67 int buffer_size
; /* Size of our data buffer */
68 struct request
*rq
; /* The corresponding request */
69 u8
*buffer
; /* Data buffer */
70 u8
*current_position
; /* Pointer into the above buffer */
71 struct scatterlist
*sg
; /* Scatter gather table */
72 int b_count
; /* Bytes transferred from current entry */
73 struct scsi_cmnd
*scsi_cmd
; /* SCSI command */
74 void (*done
)(struct scsi_cmnd
*); /* Scsi completion routine */
75 unsigned long flags
; /* Status/Action flags */
76 unsigned long timeout
; /* Command timeout */
80 * Packet command status bits.
82 #define PC_DMA_IN_PROGRESS 0 /* 1 while DMA in progress */
83 #define PC_WRITING 1 /* Data direction */
84 #define PC_TRANSFORM 2 /* transform SCSI commands */
85 #define PC_TIMEDOUT 3 /* command timed out */
86 #define PC_DMA_OK 4 /* Use DMA */
89 * SCSI command transformation layer
91 #define IDESCSI_TRANSFORM 0 /* Enable/Disable transformation */
92 #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
97 #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
99 typedef struct ide_scsi_obj
{
101 ide_driver_t
*driver
;
102 struct gendisk
*disk
;
103 struct Scsi_Host
*host
;
105 idescsi_pc_t
*pc
; /* Current packet command */
106 unsigned long flags
; /* Status/Action flags */
107 unsigned long transform
; /* SCSI cmd translation layer */
108 unsigned long log
; /* log flags */
111 static DECLARE_MUTEX(idescsi_ref_sem
);
113 #define ide_scsi_g(disk) \
114 container_of((disk)->private_data, struct ide_scsi_obj, driver)
116 static struct ide_scsi_obj
*ide_scsi_get(struct gendisk
*disk
)
118 struct ide_scsi_obj
*scsi
= NULL
;
120 down(&idescsi_ref_sem
);
121 scsi
= ide_scsi_g(disk
);
123 scsi_host_get(scsi
->host
);
124 up(&idescsi_ref_sem
);
128 static void ide_scsi_put(struct ide_scsi_obj
*scsi
)
130 down(&idescsi_ref_sem
);
131 scsi_host_put(scsi
->host
);
132 up(&idescsi_ref_sem
);
135 static inline idescsi_scsi_t
*scsihost_to_idescsi(struct Scsi_Host
*host
)
137 return (idescsi_scsi_t
*) (&host
[1]);
140 static inline idescsi_scsi_t
*drive_to_idescsi(ide_drive_t
*ide_drive
)
142 return scsihost_to_idescsi(ide_drive
->driver_data
);
146 * Per ATAPI device status bits.
148 #define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
153 #define IDESCSI_PC_RQ 90
155 static void idescsi_discard_data (ide_drive_t
*drive
, unsigned int bcount
)
158 (void) HWIF(drive
)->INB(IDE_DATA_REG
);
161 static void idescsi_output_zeros (ide_drive_t
*drive
, unsigned int bcount
)
164 HWIF(drive
)->OUTB(0, IDE_DATA_REG
);
168 * PIO data transfer routines using the scatter gather table.
170 static void idescsi_input_buffers (ide_drive_t
*drive
, idescsi_pc_t
*pc
, unsigned int bcount
)
176 if (pc
->sg
- (struct scatterlist
*) pc
->scsi_cmd
->request_buffer
> pc
->scsi_cmd
->use_sg
) {
177 printk (KERN_ERR
"ide-scsi: scatter gather table too small, discarding data\n");
178 idescsi_discard_data (drive
, bcount
);
181 count
= min(pc
->sg
->length
- pc
->b_count
, bcount
);
182 if (PageHighMem(pc
->sg
->page
)) {
185 local_irq_save(flags
);
186 buf
= kmap_atomic(pc
->sg
->page
, KM_IRQ0
) + pc
->sg
->offset
;
187 drive
->hwif
->atapi_input_bytes(drive
, buf
+ pc
->b_count
, count
);
188 kunmap_atomic(buf
- pc
->sg
->offset
, KM_IRQ0
);
189 local_irq_restore(flags
);
191 buf
= page_address(pc
->sg
->page
) + pc
->sg
->offset
;
192 drive
->hwif
->atapi_input_bytes(drive
, buf
+ pc
->b_count
, count
);
194 bcount
-= count
; pc
->b_count
+= count
;
195 if (pc
->b_count
== pc
->sg
->length
) {
202 static void idescsi_output_buffers (ide_drive_t
*drive
, idescsi_pc_t
*pc
, unsigned int bcount
)
208 if (pc
->sg
- (struct scatterlist
*) pc
->scsi_cmd
->request_buffer
> pc
->scsi_cmd
->use_sg
) {
209 printk (KERN_ERR
"ide-scsi: scatter gather table too small, padding with zeros\n");
210 idescsi_output_zeros (drive
, bcount
);
213 count
= min(pc
->sg
->length
- pc
->b_count
, bcount
);
214 if (PageHighMem(pc
->sg
->page
)) {
217 local_irq_save(flags
);
218 buf
= kmap_atomic(pc
->sg
->page
, KM_IRQ0
) + pc
->sg
->offset
;
219 drive
->hwif
->atapi_output_bytes(drive
, buf
+ pc
->b_count
, count
);
220 kunmap_atomic(buf
- pc
->sg
->offset
, KM_IRQ0
);
221 local_irq_restore(flags
);
223 buf
= page_address(pc
->sg
->page
) + pc
->sg
->offset
;
224 drive
->hwif
->atapi_output_bytes(drive
, buf
+ pc
->b_count
, count
);
226 bcount
-= count
; pc
->b_count
+= count
;
227 if (pc
->b_count
== pc
->sg
->length
) {
235 * Most of the SCSI commands are supported directly by ATAPI devices.
236 * idescsi_transform_pc handles the few exceptions.
238 static inline void idescsi_transform_pc1 (ide_drive_t
*drive
, idescsi_pc_t
*pc
)
240 u8
*c
= pc
->c
, *scsi_buf
= pc
->buffer
, *sc
= pc
->scsi_cmd
->cmnd
;
243 if (!test_bit(PC_TRANSFORM
, &pc
->flags
))
245 if (drive
->media
== ide_cdrom
|| drive
->media
== ide_optical
) {
246 if (c
[0] == READ_6
|| c
[0] == WRITE_6
) {
247 c
[8] = c
[4]; c
[5] = c
[3]; c
[4] = c
[2];
248 c
[3] = c
[1] & 0x1f; c
[2] = 0; c
[1] &= 0xe0;
249 c
[0] += (READ_10
- READ_6
);
251 if (c
[0] == MODE_SENSE
|| c
[0] == MODE_SELECT
) {
252 unsigned short new_len
;
255 if ((atapi_buf
= kmalloc(pc
->buffer_size
+ 4, GFP_ATOMIC
)) == NULL
)
257 memset(atapi_buf
, 0, pc
->buffer_size
+ 4);
266 if (c
[0] == MODE_SELECT_10
) {
267 atapi_buf
[1] = scsi_buf
[0]; /* Mode data length */
268 atapi_buf
[2] = scsi_buf
[1]; /* Medium type */
269 atapi_buf
[3] = scsi_buf
[2]; /* Device specific parameter */
270 atapi_buf
[7] = scsi_buf
[3]; /* Block descriptor length */
271 memcpy(atapi_buf
+ 8, scsi_buf
+ 4, pc
->buffer_size
- 4);
273 pc
->buffer
= atapi_buf
;
274 pc
->request_transfer
+= 4;
275 pc
->buffer_size
+= 4;
280 static inline void idescsi_transform_pc2 (ide_drive_t
*drive
, idescsi_pc_t
*pc
)
282 u8
*atapi_buf
= pc
->buffer
;
283 u8
*sc
= pc
->scsi_cmd
->cmnd
;
284 u8
*scsi_buf
= pc
->scsi_cmd
->request_buffer
;
286 if (!test_bit(PC_TRANSFORM
, &pc
->flags
))
288 if (drive
->media
== ide_cdrom
|| drive
->media
== ide_optical
) {
289 if (pc
->c
[0] == MODE_SENSE_10
&& sc
[0] == MODE_SENSE
) {
290 scsi_buf
[0] = atapi_buf
[1]; /* Mode data length */
291 scsi_buf
[1] = atapi_buf
[2]; /* Medium type */
292 scsi_buf
[2] = atapi_buf
[3]; /* Device specific parameter */
293 scsi_buf
[3] = atapi_buf
[7]; /* Block descriptor length */
294 memcpy(scsi_buf
+ 4, atapi_buf
+ 8, pc
->request_transfer
- 8);
296 if (pc
->c
[0] == INQUIRY
) {
297 scsi_buf
[2] |= 2; /* ansi_revision */
298 scsi_buf
[3] = (scsi_buf
[3] & 0xf0) | 2; /* response data format */
301 if (atapi_buf
&& atapi_buf
!= scsi_buf
)
305 static void hexdump(u8
*x
, int len
)
310 for (i
= 0; i
< len
; i
++)
315 static int idescsi_check_condition(ide_drive_t
*drive
, struct request
*failed_command
)
317 idescsi_scsi_t
*scsi
= drive_to_idescsi(drive
);
322 /* stuff a sense request in front of our current request */
323 pc
= kmalloc (sizeof (idescsi_pc_t
), GFP_ATOMIC
);
324 rq
= kmalloc (sizeof (struct request
), GFP_ATOMIC
);
325 buf
= kmalloc(SCSI_SENSE_BUFFERSIZE
, GFP_ATOMIC
);
326 if (pc
== NULL
|| rq
== NULL
|| buf
== NULL
) {
332 memset (pc
, 0, sizeof (idescsi_pc_t
));
333 memset (buf
, 0, SCSI_SENSE_BUFFERSIZE
);
334 ide_init_drive_cmd(rq
);
335 rq
->special
= (char *) pc
;
338 pc
->c
[0] = REQUEST_SENSE
;
339 pc
->c
[4] = pc
->request_transfer
= pc
->buffer_size
= SCSI_SENSE_BUFFERSIZE
;
340 rq
->flags
= REQ_SENSE
;
341 pc
->timeout
= jiffies
+ WAIT_READY
;
342 /* NOTE! Save the failed packet command in "rq->buffer" */
343 rq
->buffer
= (void *) failed_command
->special
;
344 pc
->scsi_cmd
= ((idescsi_pc_t
*) failed_command
->special
)->scsi_cmd
;
345 if (test_bit(IDESCSI_LOG_CMD
, &scsi
->log
)) {
346 printk ("ide-scsi: %s: queue cmd = ", drive
->name
);
349 rq
->rq_disk
= scsi
->disk
;
350 return ide_do_drive_cmd(drive
, rq
, ide_preempt
);
353 static int idescsi_end_request(ide_drive_t
*, int, int);
355 static ide_startstop_t
356 idescsi_atapi_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
358 if (HWIF(drive
)->INB(IDE_STATUS_REG
) & (BUSY_STAT
|DRQ_STAT
))
360 HWIF(drive
)->OUTB(WIN_IDLEIMMEDIATE
,IDE_COMMAND_REG
);
364 idescsi_end_request(drive
, 0, 0);
369 static ide_startstop_t
370 idescsi_atapi_abort(ide_drive_t
*drive
, struct request
*rq
)
372 #if IDESCSI_DEBUG_LOG
373 printk(KERN_WARNING
"idescsi_atapi_abort called for %lu\n",
374 ((idescsi_pc_t
*) rq
->special
)->scsi_cmd
->serial_number
);
376 rq
->errors
|= ERROR_MAX
;
378 idescsi_end_request(drive
, 0, 0);
383 static int idescsi_end_request (ide_drive_t
*drive
, int uptodate
, int nrsecs
)
385 idescsi_scsi_t
*scsi
= drive_to_idescsi(drive
);
386 struct request
*rq
= HWGROUP(drive
)->rq
;
387 idescsi_pc_t
*pc
= (idescsi_pc_t
*) rq
->special
;
388 int log
= test_bit(IDESCSI_LOG_CMD
, &scsi
->log
);
389 struct Scsi_Host
*host
;
393 if (!(rq
->flags
& (REQ_SPECIAL
|REQ_SENSE
))) {
394 ide_end_request(drive
, uptodate
, nrsecs
);
397 ide_end_drive_cmd (drive
, 0, 0);
398 if (rq
->flags
& REQ_SENSE
) {
399 idescsi_pc_t
*opc
= (idescsi_pc_t
*) rq
->buffer
;
401 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive
->name
, opc
->scsi_cmd
->serial_number
);
402 hexdump(pc
->buffer
,16);
404 memcpy((void *) opc
->scsi_cmd
->sense_buffer
, pc
->buffer
, SCSI_SENSE_BUFFERSIZE
);
410 pc
->scsi_cmd
->result
= (CHECK_CONDITION
<< 1) |
411 ((test_bit(PC_TIMEDOUT
, &pc
->flags
)?DID_TIME_OUT
:DID_OK
) << 16);
412 } else if (test_bit(PC_TIMEDOUT
, &pc
->flags
)) {
414 printk (KERN_WARNING
"ide-scsi: %s: timed out for %lu\n",
415 drive
->name
, pc
->scsi_cmd
->serial_number
);
416 pc
->scsi_cmd
->result
= DID_TIME_OUT
<< 16;
417 } else if (rq
->errors
>= ERROR_MAX
) {
418 pc
->scsi_cmd
->result
= DID_ERROR
<< 16;
420 printk ("ide-scsi: %s: I/O error for %lu\n", drive
->name
, pc
->scsi_cmd
->serial_number
);
421 } else if (rq
->errors
) {
423 printk ("ide-scsi: %s: check condition for %lu\n", drive
->name
, pc
->scsi_cmd
->serial_number
);
424 if (!idescsi_check_condition(drive
, rq
))
425 /* we started a request sense, so we'll be back, exit for now */
427 pc
->scsi_cmd
->result
= (CHECK_CONDITION
<< 1) | (DID_OK
<< 16);
429 pc
->scsi_cmd
->result
= DID_OK
<< 16;
430 idescsi_transform_pc2 (drive
, pc
);
432 printk ("ide-scsi: %s: suc %lu", drive
->name
, pc
->scsi_cmd
->serial_number
);
433 if (!test_bit(PC_WRITING
, &pc
->flags
) && pc
->actually_transferred
&& pc
->actually_transferred
<= 1024 && pc
->buffer
) {
435 scsi_buf
= pc
->scsi_cmd
->request_buffer
;
436 hexdump(scsi_buf
, min_t(unsigned, 16, pc
->scsi_cmd
->request_bufflen
));
440 host
= pc
->scsi_cmd
->device
->host
;
441 spin_lock_irqsave(host
->host_lock
, flags
);
442 pc
->done(pc
->scsi_cmd
);
443 spin_unlock_irqrestore(host
->host_lock
, flags
);
450 static inline unsigned long get_timeout(idescsi_pc_t
*pc
)
452 return max_t(unsigned long, WAIT_CMD
, pc
->timeout
- jiffies
);
455 static int idescsi_expiry(ide_drive_t
*drive
)
457 idescsi_scsi_t
*scsi
= drive
->driver_data
;
458 idescsi_pc_t
*pc
= scsi
->pc
;
460 #if IDESCSI_DEBUG_LOG
461 printk(KERN_WARNING
"idescsi_expiry called for %lu at %lu\n", pc
->scsi_cmd
->serial_number
, jiffies
);
463 set_bit(PC_TIMEDOUT
, &pc
->flags
);
465 return 0; /* we do not want the ide subsystem to retry */
469 * Our interrupt handler.
471 static ide_startstop_t
idescsi_pc_intr (ide_drive_t
*drive
)
473 idescsi_scsi_t
*scsi
= drive_to_idescsi(drive
);
474 idescsi_pc_t
*pc
=scsi
->pc
;
475 struct request
*rq
= pc
->rq
;
476 atapi_bcount_t bcount
;
477 atapi_status_t status
;
478 atapi_ireason_t ireason
;
479 atapi_feature_t feature
;
483 #if IDESCSI_DEBUG_LOG
484 printk (KERN_INFO
"ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
485 #endif /* IDESCSI_DEBUG_LOG */
487 if (test_bit(PC_TIMEDOUT
, &pc
->flags
)){
488 #if IDESCSI_DEBUG_LOG
489 printk(KERN_WARNING
"idescsi_pc_intr: got timed out packet %lu at %lu\n",
490 pc
->scsi_cmd
->serial_number
, jiffies
);
492 /* end this request now - scsi should retry it*/
493 idescsi_end_request (drive
, 1, 0);
496 if (test_and_clear_bit (PC_DMA_IN_PROGRESS
, &pc
->flags
)) {
497 #if IDESCSI_DEBUG_LOG
498 printk ("ide-scsi: %s: DMA complete\n", drive
->name
);
499 #endif /* IDESCSI_DEBUG_LOG */
500 pc
->actually_transferred
=pc
->request_transfer
;
501 (void) HWIF(drive
)->ide_dma_end(drive
);
505 /* Clear the interrupt */
506 status
.all
= HWIF(drive
)->INB(IDE_STATUS_REG
);
509 /* No more interrupts */
510 if (test_bit(IDESCSI_LOG_CMD
, &scsi
->log
))
511 printk (KERN_INFO
"Packet command completed, %d bytes transferred\n", pc
->actually_transferred
);
515 idescsi_end_request (drive
, 1, 0);
518 bcount
.b
.low
= HWIF(drive
)->INB(IDE_BCOUNTL_REG
);
519 bcount
.b
.high
= HWIF(drive
)->INB(IDE_BCOUNTH_REG
);
520 ireason
.all
= HWIF(drive
)->INB(IDE_IREASON_REG
);
523 printk(KERN_ERR
"ide-scsi: CoD != 0 in idescsi_pc_intr\n");
524 return ide_do_reset (drive
);
527 temp
= pc
->actually_transferred
+ bcount
.all
;
528 if (temp
> pc
->request_transfer
) {
529 if (temp
> pc
->buffer_size
) {
530 printk(KERN_ERR
"ide-scsi: The scsi wants to "
531 "send us more data than expected "
532 "- discarding data\n");
533 temp
= pc
->buffer_size
- pc
->actually_transferred
;
535 clear_bit(PC_WRITING
, &pc
->flags
);
537 idescsi_input_buffers(drive
, pc
, temp
);
539 drive
->hwif
->atapi_input_bytes(drive
, pc
->current_position
, temp
);
540 printk(KERN_ERR
"ide-scsi: transferred %d of %d bytes\n", temp
, bcount
.all
);
542 pc
->actually_transferred
+= temp
;
543 pc
->current_position
+= temp
;
544 idescsi_discard_data(drive
, bcount
.all
- temp
);
545 ide_set_handler(drive
, &idescsi_pc_intr
, get_timeout(pc
), idescsi_expiry
);
548 #if IDESCSI_DEBUG_LOG
549 printk (KERN_NOTICE
"ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
550 #endif /* IDESCSI_DEBUG_LOG */
554 clear_bit(PC_WRITING
, &pc
->flags
);
556 idescsi_input_buffers(drive
, pc
, bcount
.all
);
558 HWIF(drive
)->atapi_input_bytes(drive
, pc
->current_position
, bcount
.all
);
560 set_bit(PC_WRITING
, &pc
->flags
);
562 idescsi_output_buffers (drive
, pc
, bcount
.all
);
564 HWIF(drive
)->atapi_output_bytes(drive
, pc
->current_position
, bcount
.all
);
566 /* Update the current position */
567 pc
->actually_transferred
+= bcount
.all
;
568 pc
->current_position
+= bcount
.all
;
570 /* And set the interrupt handler again */
571 ide_set_handler(drive
, &idescsi_pc_intr
, get_timeout(pc
), idescsi_expiry
);
575 static ide_startstop_t
idescsi_transfer_pc(ide_drive_t
*drive
)
577 ide_hwif_t
*hwif
= drive
->hwif
;
578 idescsi_scsi_t
*scsi
= drive_to_idescsi(drive
);
579 idescsi_pc_t
*pc
= scsi
->pc
;
580 atapi_ireason_t ireason
;
581 ide_startstop_t startstop
;
583 if (ide_wait_stat(&startstop
,drive
,DRQ_STAT
,BUSY_STAT
,WAIT_READY
)) {
584 printk(KERN_ERR
"ide-scsi: Strange, packet command "
585 "initiated yet DRQ isn't asserted\n");
588 ireason
.all
= HWIF(drive
)->INB(IDE_IREASON_REG
);
589 if (!ireason
.b
.cod
|| ireason
.b
.io
) {
590 printk(KERN_ERR
"ide-scsi: (IO,CoD) != (0,1) while "
591 "issuing a packet command\n");
592 return ide_do_reset (drive
);
594 if (HWGROUP(drive
)->handler
!= NULL
)
596 /* Set the interrupt routine */
597 ide_set_handler(drive
, &idescsi_pc_intr
, get_timeout(pc
), idescsi_expiry
);
598 /* Send the actual packet */
599 drive
->hwif
->atapi_output_bytes(drive
, scsi
->pc
->c
, 12);
600 if (test_bit (PC_DMA_OK
, &pc
->flags
)) {
601 set_bit (PC_DMA_IN_PROGRESS
, &pc
->flags
);
602 hwif
->dma_start(drive
);
607 static inline int idescsi_set_direction(idescsi_pc_t
*pc
)
610 case READ_6
: case READ_10
: case READ_12
:
611 clear_bit(PC_WRITING
, &pc
->flags
);
613 case WRITE_6
: case WRITE_10
: case WRITE_12
:
614 set_bit(PC_WRITING
, &pc
->flags
);
621 static int idescsi_map_sg(ide_drive_t
*drive
, idescsi_pc_t
*pc
)
623 ide_hwif_t
*hwif
= drive
->hwif
;
624 struct scatterlist
*sg
, *scsi_sg
;
627 if (!pc
->request_transfer
|| pc
->request_transfer
% 1024)
630 if (idescsi_set_direction(pc
))
634 scsi_sg
= pc
->scsi_cmd
->request_buffer
;
635 segments
= pc
->scsi_cmd
->use_sg
;
637 if (segments
> hwif
->sg_max_nents
)
642 sg_init_one(sg
, pc
->scsi_cmd
->request_buffer
, pc
->request_transfer
);
644 hwif
->sg_nents
= segments
;
645 memcpy(sg
, scsi_sg
, sizeof(*sg
) * segments
);
652 * Issue a packet command
654 static ide_startstop_t
idescsi_issue_pc (ide_drive_t
*drive
, idescsi_pc_t
*pc
)
656 idescsi_scsi_t
*scsi
= drive_to_idescsi(drive
);
657 ide_hwif_t
*hwif
= drive
->hwif
;
658 atapi_feature_t feature
;
659 atapi_bcount_t bcount
;
661 scsi
->pc
=pc
; /* Set the current packet command */
662 pc
->actually_transferred
=0; /* We haven't transferred any data yet */
663 pc
->current_position
=pc
->buffer
;
664 bcount
.all
= min(pc
->request_transfer
, 63 * 1024); /* Request to transfer the entire buffer at once */
667 if (drive
->using_dma
&& !idescsi_map_sg(drive
, pc
)) {
669 feature
.b
.dma
= !hwif
->dma_setup(drive
);
675 HWIF(drive
)->OUTB(drive
->ctl
, IDE_CONTROL_REG
);
677 HWIF(drive
)->OUTB(feature
.all
, IDE_FEATURE_REG
);
678 HWIF(drive
)->OUTB(bcount
.b
.high
, IDE_BCOUNTH_REG
);
679 HWIF(drive
)->OUTB(bcount
.b
.low
, IDE_BCOUNTL_REG
);
682 set_bit(PC_DMA_OK
, &pc
->flags
);
684 if (test_bit(IDESCSI_DRQ_INTERRUPT
, &scsi
->flags
)) {
685 if (HWGROUP(drive
)->handler
!= NULL
)
687 ide_set_handler(drive
, &idescsi_transfer_pc
,
688 get_timeout(pc
), idescsi_expiry
);
689 /* Issue the packet command */
690 HWIF(drive
)->OUTB(WIN_PACKETCMD
, IDE_COMMAND_REG
);
693 /* Issue the packet command */
694 HWIF(drive
)->OUTB(WIN_PACKETCMD
, IDE_COMMAND_REG
);
695 return idescsi_transfer_pc(drive
);
700 * idescsi_do_request is our request handling function.
702 static ide_startstop_t
idescsi_do_request (ide_drive_t
*drive
, struct request
*rq
, sector_t block
)
704 #if IDESCSI_DEBUG_LOG
705 printk (KERN_INFO
"rq_status: %d, dev: %s, cmd: %x, errors: %d\n",rq
->rq_status
, rq
->rq_disk
->disk_name
,rq
->cmd
[0],rq
->errors
);
706 printk (KERN_INFO
"sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq
->sector
,rq
->nr_sectors
,rq
->current_nr_sectors
);
707 #endif /* IDESCSI_DEBUG_LOG */
709 if (rq
->flags
& (REQ_SPECIAL
|REQ_SENSE
)) {
710 return idescsi_issue_pc (drive
, (idescsi_pc_t
*) rq
->special
);
712 blk_dump_rq_flags(rq
, "ide-scsi: unsup command");
713 idescsi_end_request (drive
, 0, 0);
717 static void idescsi_add_settings(ide_drive_t
*drive
)
719 idescsi_scsi_t
*scsi
= drive_to_idescsi(drive
);
722 * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function
724 ide_add_setting(drive
, "bios_cyl", SETTING_RW
, -1, -1, TYPE_INT
, 0, 1023, 1, 1, &drive
->bios_cyl
, NULL
);
725 ide_add_setting(drive
, "bios_head", SETTING_RW
, -1, -1, TYPE_BYTE
, 0, 255, 1, 1, &drive
->bios_head
, NULL
);
726 ide_add_setting(drive
, "bios_sect", SETTING_RW
, -1, -1, TYPE_BYTE
, 0, 63, 1, 1, &drive
->bios_sect
, NULL
);
727 ide_add_setting(drive
, "transform", SETTING_RW
, -1, -1, TYPE_INT
, 0, 3, 1, 1, &scsi
->transform
, NULL
);
728 ide_add_setting(drive
, "log", SETTING_RW
, -1, -1, TYPE_INT
, 0, 1, 1, 1, &scsi
->log
, NULL
);
732 * Driver initialization.
734 static void idescsi_setup (ide_drive_t
*drive
, idescsi_scsi_t
*scsi
)
736 if (drive
->id
&& (drive
->id
->config
& 0x0060) == 0x20)
737 set_bit (IDESCSI_DRQ_INTERRUPT
, &scsi
->flags
);
738 set_bit(IDESCSI_TRANSFORM
, &scsi
->transform
);
739 clear_bit(IDESCSI_SG_TRANSFORM
, &scsi
->transform
);
740 #if IDESCSI_DEBUG_LOG
741 set_bit(IDESCSI_LOG_CMD
, &scsi
->log
);
742 #endif /* IDESCSI_DEBUG_LOG */
743 idescsi_add_settings(drive
);
746 static int ide_scsi_remove(struct device
*dev
)
748 ide_drive_t
*drive
= to_ide_device(dev
);
749 struct Scsi_Host
*scsihost
= drive
->driver_data
;
750 struct ide_scsi_obj
*scsi
= scsihost_to_idescsi(scsihost
);
751 struct gendisk
*g
= scsi
->disk
;
753 ide_unregister_subdriver(drive
, scsi
->driver
);
755 ide_unregister_region(g
);
757 drive
->driver_data
= NULL
;
758 g
->private_data
= NULL
;
761 scsi_remove_host(scsihost
);
767 static int ide_scsi_probe(struct device
*);
769 #ifdef CONFIG_PROC_FS
770 static ide_proc_entry_t idescsi_proc
[] = {
771 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
772 { NULL
, 0, NULL
, NULL
}
775 # define idescsi_proc NULL
778 static ide_driver_t idescsi_driver
= {
779 .owner
= THIS_MODULE
,
782 .bus
= &ide_bus_type
,
783 .probe
= ide_scsi_probe
,
784 .remove
= ide_scsi_remove
,
786 .version
= IDESCSI_VERSION
,
788 .supports_dsc_overlap
= 0,
789 .proc
= idescsi_proc
,
790 .do_request
= idescsi_do_request
,
791 .end_request
= idescsi_end_request
,
792 .error
= idescsi_atapi_error
,
793 .abort
= idescsi_atapi_abort
,
796 static int idescsi_ide_open(struct inode
*inode
, struct file
*filp
)
798 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
799 struct ide_scsi_obj
*scsi
;
802 if (!(scsi
= ide_scsi_get(disk
)))
812 static int idescsi_ide_release(struct inode
*inode
, struct file
*filp
)
814 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
815 struct ide_scsi_obj
*scsi
= ide_scsi_g(disk
);
816 ide_drive_t
*drive
= scsi
->drive
;
825 static int idescsi_ide_ioctl(struct inode
*inode
, struct file
*file
,
826 unsigned int cmd
, unsigned long arg
)
828 struct block_device
*bdev
= inode
->i_bdev
;
829 struct ide_scsi_obj
*scsi
= ide_scsi_g(bdev
->bd_disk
);
830 return generic_ide_ioctl(scsi
->drive
, file
, bdev
, cmd
, arg
);
833 static struct block_device_operations idescsi_ops
= {
834 .owner
= THIS_MODULE
,
835 .open
= idescsi_ide_open
,
836 .release
= idescsi_ide_release
,
837 .ioctl
= idescsi_ide_ioctl
,
840 static int idescsi_slave_configure(struct scsi_device
* sdp
)
842 /* Configure detected device */
843 scsi_adjust_queue_depth(sdp
, MSG_SIMPLE_TAG
, sdp
->host
->cmd_per_lun
);
847 static const char *idescsi_info (struct Scsi_Host
*host
)
849 return "SCSI host adapter emulation for IDE ATAPI devices";
852 static int idescsi_ioctl (struct scsi_device
*dev
, int cmd
, void __user
*arg
)
854 idescsi_scsi_t
*scsi
= scsihost_to_idescsi(dev
->host
);
856 if (cmd
== SG_SET_TRANSFORM
) {
858 set_bit(IDESCSI_SG_TRANSFORM
, &scsi
->transform
);
860 clear_bit(IDESCSI_SG_TRANSFORM
, &scsi
->transform
);
862 } else if (cmd
== SG_GET_TRANSFORM
)
863 return put_user(test_bit(IDESCSI_SG_TRANSFORM
, &scsi
->transform
), (int __user
*) arg
);
867 static inline int should_transform(ide_drive_t
*drive
, struct scsi_cmnd
*cmd
)
869 idescsi_scsi_t
*scsi
= drive_to_idescsi(drive
);
871 /* this was a layering violation and we can't support it
874 struct gendisk
*disk
= cmd
->request
->rq_disk
;
877 struct Scsi_Device_Template
**p
= disk
->private_data
;
878 if (strcmp((*p
)->scsi_driverfs_driver
.name
, "sg") == 0)
879 return test_bit(IDESCSI_SG_TRANSFORM
, &scsi
->transform
);
882 return test_bit(IDESCSI_TRANSFORM
, &scsi
->transform
);
885 static int idescsi_queue (struct scsi_cmnd
*cmd
,
886 void (*done
)(struct scsi_cmnd
*))
888 struct Scsi_Host
*host
= cmd
->device
->host
;
889 idescsi_scsi_t
*scsi
= scsihost_to_idescsi(host
);
890 ide_drive_t
*drive
= scsi
->drive
;
891 struct request
*rq
= NULL
;
892 idescsi_pc_t
*pc
= NULL
;
895 printk (KERN_ERR
"ide-scsi: drive id %d not present\n", cmd
->device
->id
);
898 scsi
= drive_to_idescsi(drive
);
899 pc
= kmalloc (sizeof (idescsi_pc_t
), GFP_ATOMIC
);
900 rq
= kmalloc (sizeof (struct request
), GFP_ATOMIC
);
901 if (rq
== NULL
|| pc
== NULL
) {
902 printk (KERN_ERR
"ide-scsi: %s: out of memory\n", drive
->name
);
906 memset (pc
->c
, 0, 12);
909 memcpy (pc
->c
, cmd
->cmnd
, cmd
->cmd_len
);
912 pc
->sg
= cmd
->request_buffer
;
914 pc
->buffer
= cmd
->request_buffer
;
918 pc
->request_transfer
= pc
->buffer_size
= cmd
->request_bufflen
;
921 pc
->timeout
= jiffies
+ cmd
->timeout_per_command
;
923 if (should_transform(drive
, cmd
))
924 set_bit(PC_TRANSFORM
, &pc
->flags
);
925 idescsi_transform_pc1 (drive
, pc
);
927 if (test_bit(IDESCSI_LOG_CMD
, &scsi
->log
)) {
928 printk ("ide-scsi: %s: que %lu, cmd = ", drive
->name
, cmd
->serial_number
);
929 hexdump(cmd
->cmnd
, cmd
->cmd_len
);
930 if (memcmp(pc
->c
, cmd
->cmnd
, cmd
->cmd_len
)) {
931 printk ("ide-scsi: %s: que %lu, tsl = ", drive
->name
, cmd
->serial_number
);
936 ide_init_drive_cmd (rq
);
937 rq
->special
= (char *) pc
;
938 rq
->flags
= REQ_SPECIAL
;
939 spin_unlock_irq(host
->host_lock
);
940 rq
->rq_disk
= scsi
->disk
;
941 (void) ide_do_drive_cmd (drive
, rq
, ide_end
);
942 spin_lock_irq(host
->host_lock
);
947 cmd
->result
= DID_ERROR
<< 16;
952 static int idescsi_eh_abort (struct scsi_cmnd
*cmd
)
954 idescsi_scsi_t
*scsi
= scsihost_to_idescsi(cmd
->device
->host
);
955 ide_drive_t
*drive
= scsi
->drive
;
959 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
961 if (test_bit(IDESCSI_LOG_CMD
, &scsi
->log
))
962 printk (KERN_WARNING
"ide-scsi: abort called for %lu\n", cmd
->serial_number
);
965 printk (KERN_WARNING
"ide-scsi: Drive not set in idescsi_eh_abort\n");
970 /* First give it some more time, how much is "right" is hard to say :-( */
972 busy
= ide_wait_not_busy(HWIF(drive
), 100); /* FIXME - uses mdelay which causes latency? */
973 if (test_bit(IDESCSI_LOG_CMD
, &scsi
->log
))
974 printk (KERN_WARNING
"ide-scsi: drive did%s become ready\n", busy
?" not":"");
976 spin_lock_irq(&ide_lock
);
978 /* If there is no pc running we're done (our interrupt took care of it) */
984 /* It's somewhere in flight. Does ide subsystem agree? */
985 if (scsi
->pc
->scsi_cmd
->serial_number
== cmd
->serial_number
&& !busy
&&
986 elv_queue_empty(drive
->queue
) && HWGROUP(drive
)->rq
!= scsi
->pc
->rq
) {
988 * FIXME - not sure this condition can ever occur
990 printk (KERN_ERR
"ide-scsi: cmd aborted!\n");
992 if (scsi
->pc
->rq
->flags
& REQ_SENSE
)
993 kfree(scsi
->pc
->buffer
);
1002 spin_unlock_irq(&ide_lock
);
1004 if (test_bit(IDESCSI_LOG_CMD
, &scsi
->log
))
1005 printk (KERN_WARNING
"ide-scsi: abort returns %s\n", ret
== SUCCESS
?"success":"failed");
1010 static int idescsi_eh_reset (struct scsi_cmnd
*cmd
)
1012 struct request
*req
;
1013 idescsi_scsi_t
*scsi
= scsihost_to_idescsi(cmd
->device
->host
);
1014 ide_drive_t
*drive
= scsi
->drive
;
1018 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1020 if (test_bit(IDESCSI_LOG_CMD
, &scsi
->log
))
1021 printk (KERN_WARNING
"ide-scsi: reset called for %lu\n", cmd
->serial_number
);
1024 printk (KERN_WARNING
"ide-scsi: Drive not set in idescsi_eh_reset\n");
1029 spin_lock_irq(&ide_lock
);
1031 if (!scsi
->pc
|| (req
= scsi
->pc
->rq
) != HWGROUP(drive
)->rq
|| !HWGROUP(drive
)->handler
) {
1032 printk (KERN_WARNING
"ide-scsi: No active request in idescsi_eh_reset\n");
1033 spin_unlock(&ide_lock
);
1037 /* kill current request */
1038 blkdev_dequeue_request(req
);
1039 end_that_request_last(req
);
1040 if (req
->flags
& REQ_SENSE
)
1041 kfree(scsi
->pc
->buffer
);
1046 /* now nuke the drive queue */
1047 while ((req
= elv_next_request(drive
->queue
))) {
1048 blkdev_dequeue_request(req
);
1049 end_that_request_last(req
);
1052 HWGROUP(drive
)->rq
= NULL
;
1053 HWGROUP(drive
)->handler
= NULL
;
1054 HWGROUP(drive
)->busy
= 1; /* will set this to zero when ide reset finished */
1055 spin_unlock_irq(&ide_lock
);
1057 ide_do_reset(drive
);
1059 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
1062 set_current_state(TASK_UNINTERRUPTIBLE
);
1063 spin_unlock_irq(cmd
->device
->host
->host_lock
);
1064 schedule_timeout(HZ
/20);
1065 spin_lock_irq(cmd
->device
->host
->host_lock
);
1066 } while ( HWGROUP(drive
)->handler
);
1068 ready
= drive_is_ready(drive
);
1069 HWGROUP(drive
)->busy
--;
1071 printk (KERN_ERR
"ide-scsi: reset failed!\n");
1078 static int idescsi_bios(struct scsi_device
*sdev
, struct block_device
*bdev
,
1079 sector_t capacity
, int *parm
)
1081 idescsi_scsi_t
*idescsi
= scsihost_to_idescsi(sdev
->host
);
1082 ide_drive_t
*drive
= idescsi
->drive
;
1084 if (drive
->bios_cyl
&& drive
->bios_head
&& drive
->bios_sect
) {
1085 parm
[0] = drive
->bios_head
;
1086 parm
[1] = drive
->bios_sect
;
1087 parm
[2] = drive
->bios_cyl
;
1092 static struct scsi_host_template idescsi_template
= {
1093 .module
= THIS_MODULE
,
1095 .info
= idescsi_info
,
1096 .slave_configure
= idescsi_slave_configure
,
1097 .ioctl
= idescsi_ioctl
,
1098 .queuecommand
= idescsi_queue
,
1099 .eh_abort_handler
= idescsi_eh_abort
,
1100 .eh_host_reset_handler
= idescsi_eh_reset
,
1101 .bios_param
= idescsi_bios
,
1104 .sg_tablesize
= 256,
1107 .use_clustering
= DISABLE_CLUSTERING
,
1109 .proc_name
= "ide-scsi",
1112 static int ide_scsi_probe(struct device
*dev
)
1114 ide_drive_t
*drive
= to_ide_device(dev
);
1115 idescsi_scsi_t
*idescsi
;
1116 struct Scsi_Host
*host
;
1121 if (!warned
&& drive
->media
== ide_cdrom
) {
1122 printk(KERN_WARNING
"ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1126 if (!strstr("ide-scsi", drive
->driver_req
) ||
1128 drive
->media
== ide_disk
||
1129 !(host
= scsi_host_alloc(&idescsi_template
,sizeof(idescsi_scsi_t
))))
1132 g
= alloc_disk(1 << PARTN_BITS
);
1136 ide_init_disk(g
, drive
);
1140 #if IDESCSI_DEBUG_LOG
1141 if (drive
->id
->last_lun
)
1142 printk(KERN_NOTICE
"%s: id->last_lun=%u\n", drive
->name
, drive
->id
->last_lun
);
1144 if ((drive
->id
->last_lun
& 0x7) != 7)
1145 host
->max_lun
= (drive
->id
->last_lun
& 0x7) + 1;
1149 drive
->driver_data
= host
;
1150 idescsi
= scsihost_to_idescsi(host
);
1151 idescsi
->drive
= drive
;
1152 idescsi
->driver
= &idescsi_driver
;
1153 idescsi
->host
= host
;
1155 g
->private_data
= &idescsi
->driver
;
1156 ide_register_subdriver(drive
, &idescsi_driver
);
1158 idescsi_setup(drive
, idescsi
);
1159 g
->fops
= &idescsi_ops
;
1160 ide_register_region(g
);
1161 err
= scsi_add_host(host
, &drive
->gendev
);
1163 scsi_scan_host(host
);
1166 /* fall through on error */
1167 ide_unregister_region(g
);
1168 ide_unregister_subdriver(drive
, &idescsi_driver
);
1172 scsi_host_put(host
);
1176 static int __init
init_idescsi_module(void)
1178 return driver_register(&idescsi_driver
.gen_driver
);
1181 static void __exit
exit_idescsi_module(void)
1183 driver_unregister(&idescsi_driver
.gen_driver
);
1186 module_init(init_idescsi_module
);
1187 module_exit(exit_idescsi_module
);
1188 MODULE_LICENSE("GPL");