blob: 02e91893064d89d6a80a25ef78daee53b1b9f0a8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/drivers/scsi/ide-scsi.c Version 0.9 Jul 4, 1999
3 *
4 * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
5 */
6
7/*
8 * Emulation of a SCSI host adapter for IDE ATAPI devices.
9 *
10 * With this driver, one can use the Linux SCSI drivers instead of the
11 * native IDE ATAPI drivers.
12 *
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
32 */
33
34#define IDESCSI_VERSION "0.92"
35
36#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <linux/types.h>
38#include <linux/string.h>
39#include <linux/kernel.h>
40#include <linux/mm.h>
41#include <linux/ioport.h>
42#include <linux/blkdev.h>
43#include <linux/errno.h>
44#include <linux/hdreg.h>
45#include <linux/slab.h>
46#include <linux/ide.h>
47#include <linux/scatterlist.h>
Jeff Garzik df0ae242005-05-28 07:57:14 -040048#include <linux/delay.h>
Jes Sorensene723ccd2006-03-23 03:00:22 -080049#include <linux/mutex.h>
Jiri Slaby1977f032007-10-18 23:40:25 -070050#include <linux/bitops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <asm/uaccess.h>
54
55#include <scsi/scsi.h>
56#include <scsi/scsi_cmnd.h>
57#include <scsi/scsi_device.h>
58#include <scsi/scsi_host.h>
59#include <scsi/scsi_tcq.h>
60#include <scsi/sg.h>
61
62#define IDESCSI_DEBUG_LOG 0
63
64typedef struct idescsi_pc_s {
65 u8 c[12]; /* Actual packet bytes */
66 int request_transfer; /* Bytes to transfer */
67 int actually_transferred; /* Bytes actually transferred */
68 int buffer_size; /* Size of our data buffer */
69 struct request *rq; /* The corresponding request */
70 u8 *buffer; /* Data buffer */
71 u8 *current_position; /* Pointer into the above buffer */
72 struct scatterlist *sg; /* Scatter gather table */
Jens Axboec79d88b2007-10-17 13:16:35 +020073 unsigned int sg_cnt; /* Number of entries in sg */
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 int b_count; /* Bytes transferred from current entry */
75 struct scsi_cmnd *scsi_cmd; /* SCSI command */
76 void (*done)(struct scsi_cmnd *); /* Scsi completion routine */
77 unsigned long flags; /* Status/Action flags */
78 unsigned long timeout; /* Command timeout */
79} idescsi_pc_t;
80
81/*
82 * Packet command status bits.
83 */
84#define PC_DMA_IN_PROGRESS 0 /* 1 while DMA in progress */
85#define PC_WRITING 1 /* Data direction */
Linus Torvalds1da177e2005-04-16 15:20:36 -070086#define PC_TIMEDOUT 3 /* command timed out */
87#define PC_DMA_OK 4 /* Use DMA */
88
89/*
90 * SCSI command transformation layer
91 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070092#define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
93
94/*
95 * Log flags
96 */
97#define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
98
99typedef struct ide_scsi_obj {
100 ide_drive_t *drive;
101 ide_driver_t *driver;
102 struct gendisk *disk;
103 struct Scsi_Host *host;
104
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 */
109} idescsi_scsi_t;
110
Jes Sorensene723ccd2006-03-23 03:00:22 -0800111static DEFINE_MUTEX(idescsi_ref_mutex);
Alan Coxaaeab802006-12-06 20:39:33 -0800112static int idescsi_nocd; /* Set by module param to skip cd */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
114#define ide_scsi_g(disk) \
115 container_of((disk)->private_data, struct ide_scsi_obj, driver)
116
117static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
118{
119 struct ide_scsi_obj *scsi = NULL;
120
Jes Sorensene723ccd2006-03-23 03:00:22 -0800121 mutex_lock(&idescsi_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 scsi = ide_scsi_g(disk);
123 if (scsi)
124 scsi_host_get(scsi->host);
Jes Sorensene723ccd2006-03-23 03:00:22 -0800125 mutex_unlock(&idescsi_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 return scsi;
127}
128
129static void ide_scsi_put(struct ide_scsi_obj *scsi)
130{
Jes Sorensene723ccd2006-03-23 03:00:22 -0800131 mutex_lock(&idescsi_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 scsi_host_put(scsi->host);
Jes Sorensene723ccd2006-03-23 03:00:22 -0800133 mutex_unlock(&idescsi_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134}
135
136static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
137{
138 return (idescsi_scsi_t*) (&host[1]);
139}
140
141static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
142{
143 return scsihost_to_idescsi(ide_drive->driver_data);
144}
145
146/*
147 * Per ATAPI device status bits.
148 */
149#define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
150
151/*
152 * ide-scsi requests.
153 */
154#define IDESCSI_PC_RQ 90
155
156static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
157{
158 while (bcount--)
159 (void) HWIF(drive)->INB(IDE_DATA_REG);
160}
161
162static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
163{
164 while (bcount--)
165 HWIF(drive)->OUTB(0, IDE_DATA_REG);
166}
167
168/*
169 * PIO data transfer routines using the scatter gather table.
170 */
171static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
172{
173 int count;
174 char *buf;
175
176 while (bcount) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 count = min(pc->sg->length - pc->b_count, bcount);
Jens Axboe45711f12007-10-22 21:19:53 +0200178 if (PageHighMem(sg_page(pc->sg))) {
Andrew Mortona717f772005-10-31 14:08:53 -0800179 unsigned long flags;
180
181 local_irq_save(flags);
Jens Axboe45711f12007-10-22 21:19:53 +0200182 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
Andrew Mortona717f772005-10-31 14:08:53 -0800183 pc->sg->offset;
184 drive->hwif->atapi_input_bytes(drive,
185 buf + pc->b_count, count);
186 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
187 local_irq_restore(flags);
188 } else {
Jens Axboe45711f12007-10-22 21:19:53 +0200189 buf = sg_virt(pc->sg);
Andrew Mortona717f772005-10-31 14:08:53 -0800190 drive->hwif->atapi_input_bytes(drive,
191 buf + pc->b_count, count);
192 }
193 bcount -= count; pc->b_count += count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 if (pc->b_count == pc->sg->length) {
Jens Axboec79d88b2007-10-17 13:16:35 +0200195 if (!--pc->sg_cnt)
Jens Axboed274a982007-10-16 11:20:52 +0200196 break;
197 pc->sg = sg_next(pc->sg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 pc->b_count = 0;
199 }
200 }
Jens Axboed274a982007-10-16 11:20:52 +0200201
202 if (bcount) {
203 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
204 idescsi_discard_data (drive, bcount);
205 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206}
207
208static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
209{
210 int count;
211 char *buf;
212
213 while (bcount) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 count = min(pc->sg->length - pc->b_count, bcount);
Jens Axboe45711f12007-10-22 21:19:53 +0200215 if (PageHighMem(sg_page(pc->sg))) {
Andrew Mortona717f772005-10-31 14:08:53 -0800216 unsigned long flags;
217
218 local_irq_save(flags);
Jens Axboe45711f12007-10-22 21:19:53 +0200219 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
Andrew Mortona717f772005-10-31 14:08:53 -0800220 pc->sg->offset;
221 drive->hwif->atapi_output_bytes(drive,
222 buf + pc->b_count, count);
223 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
224 local_irq_restore(flags);
225 } else {
Jens Axboe45711f12007-10-22 21:19:53 +0200226 buf = sg_virt(pc->sg);
Andrew Mortona717f772005-10-31 14:08:53 -0800227 drive->hwif->atapi_output_bytes(drive,
228 buf + pc->b_count, count);
229 }
230 bcount -= count; pc->b_count += count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 if (pc->b_count == pc->sg->length) {
Jens Axboec79d88b2007-10-17 13:16:35 +0200232 if (!--pc->sg_cnt)
Jens Axboed274a982007-10-16 11:20:52 +0200233 break;
234 pc->sg = sg_next(pc->sg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 pc->b_count = 0;
236 }
237 }
Jens Axboed274a982007-10-16 11:20:52 +0200238
239 if (bcount) {
240 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
241 idescsi_output_zeros (drive, bcount);
242 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243}
244
Bartlomiej Zolnierkiewicz69ae6fe2007-12-12 23:31:57 +0100245static void ide_scsi_hex_dump(u8 *data, int len)
246{
247 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
248}
249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
251{
252 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
253 idescsi_pc_t *pc;
254 struct request *rq;
255 u8 *buf;
256
257 /* stuff a sense request in front of our current request */
Mariusz Kozlowski41ead3c2007-08-01 23:46:45 +0200258 pc = kzalloc(sizeof(idescsi_pc_t), GFP_ATOMIC);
259 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
260 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
261 if (!pc || !rq || !buf) {
Jesper Juhlc9475cb2005-11-07 01:01:26 -0800262 kfree(buf);
263 kfree(rq);
264 kfree(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 return -ENOMEM;
266 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 ide_init_drive_cmd(rq);
268 rq->special = (char *) pc;
269 pc->rq = rq;
270 pc->buffer = buf;
271 pc->c[0] = REQUEST_SENSE;
272 pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
Jens Axboe4aff5e22006-08-10 08:44:47 +0200273 rq->cmd_type = REQ_TYPE_SENSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 pc->timeout = jiffies + WAIT_READY;
275 /* NOTE! Save the failed packet command in "rq->buffer" */
276 rq->buffer = (void *) failed_command->special;
277 pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
278 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
279 printk ("ide-scsi: %s: queue cmd = ", drive->name);
Bartlomiej Zolnierkiewicz69ae6fe2007-12-12 23:31:57 +0100280 ide_scsi_hex_dump(pc->c, 6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 }
282 rq->rq_disk = scsi->disk;
283 return ide_do_drive_cmd(drive, rq, ide_preempt);
284}
285
286static int idescsi_end_request(ide_drive_t *, int, int);
287
288static ide_startstop_t
289idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
290{
291 if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
292 /* force an abort */
293 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
294
295 rq->errors++;
296
297 idescsi_end_request(drive, 0, 0);
298
299 return ide_stopped;
300}
301
302static ide_startstop_t
303idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
304{
305#if IDESCSI_DEBUG_LOG
306 printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
307 ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
308#endif
309 rq->errors |= ERROR_MAX;
310
311 idescsi_end_request(drive, 0, 0);
312
313 return ide_stopped;
314}
315
316static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
317{
318 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
319 struct request *rq = HWGROUP(drive)->rq;
320 idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
321 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
322 struct Scsi_Host *host;
Willem Riede32565342005-10-31 00:03:49 +0000323 int errors = rq->errors;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 unsigned long flags;
325
Jens Axboe4aff5e22006-08-10 08:44:47 +0200326 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 ide_end_request(drive, uptodate, nrsecs);
328 return 0;
329 }
330 ide_end_drive_cmd (drive, 0, 0);
Jens Axboe4aff5e22006-08-10 08:44:47 +0200331 if (blk_sense_request(rq)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
333 if (log) {
334 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
Bartlomiej Zolnierkiewicz69ae6fe2007-12-12 23:31:57 +0100335 ide_scsi_hex_dump(pc->buffer, 16);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 }
337 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
338 kfree(pc->buffer);
339 kfree(pc);
340 kfree(rq);
341 pc = opc;
342 rq = pc->rq;
343 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
344 ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
345 } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
346 if (log)
347 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
348 drive->name, pc->scsi_cmd->serial_number);
349 pc->scsi_cmd->result = DID_TIME_OUT << 16;
Willem Riede32565342005-10-31 00:03:49 +0000350 } else if (errors >= ERROR_MAX) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 pc->scsi_cmd->result = DID_ERROR << 16;
352 if (log)
353 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
Willem Riede32565342005-10-31 00:03:49 +0000354 } else if (errors) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 if (log)
356 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
357 if (!idescsi_check_condition(drive, rq))
358 /* we started a request sense, so we'll be back, exit for now */
359 return 0;
360 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
361 } else {
362 pc->scsi_cmd->result = DID_OK << 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 }
364 host = pc->scsi_cmd->device->host;
365 spin_lock_irqsave(host->host_lock, flags);
366 pc->done(pc->scsi_cmd);
367 spin_unlock_irqrestore(host->host_lock, flags);
368 kfree(pc);
369 kfree(rq);
370 scsi->pc = NULL;
371 return 0;
372}
373
374static inline unsigned long get_timeout(idescsi_pc_t *pc)
375{
376 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
377}
378
379static int idescsi_expiry(ide_drive_t *drive)
380{
Bartlomiej Zolnierkiewiczd1be0a82007-06-16 02:24:44 +0200381 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 idescsi_pc_t *pc = scsi->pc;
383
384#if IDESCSI_DEBUG_LOG
385 printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
386#endif
387 set_bit(PC_TIMEDOUT, &pc->flags);
388
389 return 0; /* we do not want the ide subsystem to retry */
390}
391
392/*
393 * Our interrupt handler.
394 */
395static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
396{
397 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100398 ide_hwif_t *hwif = drive->hwif;
399 idescsi_pc_t *pc = scsi->pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 struct request *rq = pc->rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 unsigned int temp;
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100402 u16 bcount;
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100403 u8 stat, ireason;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
405#if IDESCSI_DEBUG_LOG
406 printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
407#endif /* IDESCSI_DEBUG_LOG */
408
409 if (test_bit(PC_TIMEDOUT, &pc->flags)){
410#if IDESCSI_DEBUG_LOG
411 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
412 pc->scsi_cmd->serial_number, jiffies);
413#endif
414 /* end this request now - scsi should retry it*/
415 idescsi_end_request (drive, 1, 0);
416 return ide_stopped;
417 }
418 if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
419#if IDESCSI_DEBUG_LOG
420 printk ("ide-scsi: %s: DMA complete\n", drive->name);
421#endif /* IDESCSI_DEBUG_LOG */
422 pc->actually_transferred=pc->request_transfer;
423 (void) HWIF(drive)->ide_dma_end(drive);
424 }
425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 /* Clear the interrupt */
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +0100427 stat = drive->hwif->INB(IDE_STATUS_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +0100429 if ((stat & DRQ_STAT) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 /* No more interrupts */
431 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
432 printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
Ingo Molnar36e8e572006-08-27 01:23:56 -0700433 local_irq_enable_in_hardirq();
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +0100434 if (stat & ERR_STAT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 rq->errors++;
436 idescsi_end_request (drive, 1, 0);
437 return ide_stopped;
438 }
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100439 bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) |
440 hwif->INB(IDE_BCOUNTL_REG);
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100441 ireason = hwif->INB(IDE_IREASON_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100443 if (ireason & CD) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
445 return ide_do_reset (drive);
446 }
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100447 if (ireason & IO) {
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100448 temp = pc->actually_transferred + bcount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 if (temp > pc->request_transfer) {
450 if (temp > pc->buffer_size) {
451 printk(KERN_ERR "ide-scsi: The scsi wants to "
452 "send us more data than expected "
453 "- discarding data\n");
454 temp = pc->buffer_size - pc->actually_transferred;
455 if (temp) {
456 clear_bit(PC_WRITING, &pc->flags);
457 if (pc->sg)
458 idescsi_input_buffers(drive, pc, temp);
459 else
460 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100461 printk(KERN_ERR "ide-scsi: transferred"
462 " %d of %d bytes\n",
463 temp, bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 }
465 pc->actually_transferred += temp;
466 pc->current_position += temp;
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100467 idescsi_discard_data(drive, bcount - temp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
469 return ide_started;
470 }
471#if IDESCSI_DEBUG_LOG
472 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
473#endif /* IDESCSI_DEBUG_LOG */
474 }
475 }
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100476 if (ireason & IO) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 clear_bit(PC_WRITING, &pc->flags);
478 if (pc->sg)
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100479 idescsi_input_buffers(drive, pc, bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 else
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100481 hwif->atapi_input_bytes(drive, pc->current_position,
482 bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 } else {
484 set_bit(PC_WRITING, &pc->flags);
485 if (pc->sg)
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100486 idescsi_output_buffers(drive, pc, bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 else
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100488 hwif->atapi_output_bytes(drive, pc->current_position,
489 bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 }
491 /* Update the current position */
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100492 pc->actually_transferred += bcount;
493 pc->current_position += bcount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
495 /* And set the interrupt handler again */
496 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
497 return ide_started;
498}
499
500static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
501{
502 ide_hwif_t *hwif = drive->hwif;
503 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
504 idescsi_pc_t *pc = scsi->pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 ide_startstop_t startstop;
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100506 u8 ireason;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507
508 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
509 printk(KERN_ERR "ide-scsi: Strange, packet command "
510 "initiated yet DRQ isn't asserted\n");
511 return startstop;
512 }
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100513 ireason = hwif->INB(IDE_IREASON_REG);
514 if ((ireason & CD) == 0 || (ireason & IO)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
516 "issuing a packet command\n");
517 return ide_do_reset (drive);
518 }
Eric Sesterhenn125e1872006-06-23 02:06:06 -0700519 BUG_ON(HWGROUP(drive)->handler != NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 /* Set the interrupt routine */
521 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
522 /* Send the actual packet */
523 drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
524 if (test_bit (PC_DMA_OK, &pc->flags)) {
525 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
526 hwif->dma_start(drive);
527 }
528 return ide_started;
529}
530
531static inline int idescsi_set_direction(idescsi_pc_t *pc)
532{
533 switch (pc->c[0]) {
534 case READ_6: case READ_10: case READ_12:
535 clear_bit(PC_WRITING, &pc->flags);
536 return 0;
537 case WRITE_6: case WRITE_10: case WRITE_12:
538 set_bit(PC_WRITING, &pc->flags);
539 return 0;
540 default:
541 return 1;
542 }
543}
544
545static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
546{
547 ide_hwif_t *hwif = drive->hwif;
548 struct scatterlist *sg, *scsi_sg;
549 int segments;
550
551 if (!pc->request_transfer || pc->request_transfer % 1024)
552 return 1;
553
554 if (idescsi_set_direction(pc))
555 return 1;
556
557 sg = hwif->sg_table;
Boaz Harrosh427d0bd2007-09-18 12:27:43 +0200558 scsi_sg = scsi_sglist(pc->scsi_cmd);
559 segments = scsi_sg_count(pc->scsi_cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
561 if (segments > hwif->sg_max_nents)
562 return 1;
563
Boaz Harrosh427d0bd2007-09-18 12:27:43 +0200564 hwif->sg_nents = segments;
565 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
567 return 0;
568}
569
570/*
571 * Issue a packet command
572 */
573static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
574{
575 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
576 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100577 u16 bcount;
Bartlomiej Zolnierkiewicze5f9f5a2008-01-25 22:17:12 +0100578 u8 dma = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
580 scsi->pc=pc; /* Set the current packet command */
581 pc->actually_transferred=0; /* We haven't transferred any data yet */
582 pc->current_position=pc->buffer;
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100583 /* Request to transfer the entire buffer at once */
584 bcount = min(pc->request_transfer, 63 * 1024);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
587 hwif->sg_mapped = 1;
Bartlomiej Zolnierkiewicze5f9f5a2008-01-25 22:17:12 +0100588 dma = !hwif->dma_setup(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 hwif->sg_mapped = 0;
590 }
591
592 SELECT_DRIVE(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
Bartlomiej Zolnierkiewicz2fc57382008-01-25 22:17:13 +0100594 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK, bcount, dma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595
Bartlomiej Zolnierkiewicze5f9f5a2008-01-25 22:17:12 +0100596 if (dma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 set_bit(PC_DMA_OK, &pc->flags);
598
599 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
Eric Sesterhenn125e1872006-06-23 02:06:06 -0700600 BUG_ON(HWGROUP(drive)->handler != NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 ide_set_handler(drive, &idescsi_transfer_pc,
602 get_timeout(pc), idescsi_expiry);
603 /* Issue the packet command */
604 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
605 return ide_started;
606 } else {
607 /* Issue the packet command */
608 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
609 return idescsi_transfer_pc(drive);
610 }
611}
612
613/*
614 * idescsi_do_request is our request handling function.
615 */
616static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
617{
618#if IDESCSI_DEBUG_LOG
Jens Axboecdd60262006-07-28 09:32:07 +0200619 printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
621#endif /* IDESCSI_DEBUG_LOG */
622
Jens Axboe4aff5e22006-08-10 08:44:47 +0200623 if (blk_sense_request(rq) || blk_special_request(rq)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
625 }
626 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
627 idescsi_end_request (drive, 0, 0);
628 return ide_stopped;
629}
630
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +0200631#ifdef CONFIG_IDE_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632static void idescsi_add_settings(ide_drive_t *drive)
633{
634 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
635
636/*
Bartlomiej Zolnierkiewicz14979432007-05-10 00:01:10 +0200637 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 */
Bartlomiej Zolnierkiewicz14979432007-05-10 00:01:10 +0200639 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
640 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
641 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
642 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
643 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644}
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +0200645#else
646static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
647#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
649/*
650 * Driver initialization.
651 */
652static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
653{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 if (drive->id && (drive->id->config & 0x0060) == 0x20)
655 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
657#if IDESCSI_DEBUG_LOG
658 set_bit(IDESCSI_LOG_CMD, &scsi->log);
659#endif /* IDESCSI_DEBUG_LOG */
660 idescsi_add_settings(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661}
662
Mikael Petterssonb62735d2006-02-01 03:04:45 -0800663static void ide_scsi_remove(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664{
665 struct Scsi_Host *scsihost = drive->driver_data;
666 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
667 struct gendisk *g = scsi->disk;
668
Matthew Wilcox6fdea8d2007-08-15 12:57:01 -0600669 scsi_remove_host(scsihost);
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +0200670 ide_proc_unregister_driver(drive, scsi->driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
672 ide_unregister_region(g);
673
674 drive->driver_data = NULL;
675 g->private_data = NULL;
676 put_disk(g);
677
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 ide_scsi_put(scsi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679}
680
Mikael Petterssonb62735d2006-02-01 03:04:45 -0800681static int ide_scsi_probe(ide_drive_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682
Bartlomiej Zolnierkiewiczecfd80e2007-05-10 00:01:09 +0200683#ifdef CONFIG_IDE_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684static ide_proc_entry_t idescsi_proc[] = {
685 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
686 { NULL, 0, NULL, NULL }
687};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688#endif
689
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690static ide_driver_t idescsi_driver = {
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +0200691 .gen_driver = {
Laurent Riffard4ef3b8f2005-11-18 22:15:40 +0100692 .owner = THIS_MODULE,
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +0200693 .name = "ide-scsi",
694 .bus = &ide_bus_type,
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +0200695 },
Mikael Petterssonb62735d2006-02-01 03:04:45 -0800696 .probe = ide_scsi_probe,
697 .remove = ide_scsi_remove,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 .version = IDESCSI_VERSION,
699 .media = ide_scsi,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 .supports_dsc_overlap = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 .do_request = idescsi_do_request,
702 .end_request = idescsi_end_request,
703 .error = idescsi_atapi_error,
704 .abort = idescsi_atapi_abort,
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +0200705#ifdef CONFIG_IDE_PROC_FS
706 .proc = idescsi_proc,
707#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708};
709
710static int idescsi_ide_open(struct inode *inode, struct file *filp)
711{
712 struct gendisk *disk = inode->i_bdev->bd_disk;
713 struct ide_scsi_obj *scsi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714
715 if (!(scsi = ide_scsi_get(disk)))
716 return -ENXIO;
717
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 return 0;
719}
720
721static int idescsi_ide_release(struct inode *inode, struct file *filp)
722{
723 struct gendisk *disk = inode->i_bdev->bd_disk;
724 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
726 ide_scsi_put(scsi);
727
728 return 0;
729}
730
731static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
732 unsigned int cmd, unsigned long arg)
733{
734 struct block_device *bdev = inode->i_bdev;
735 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
736 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
737}
738
739static struct block_device_operations idescsi_ops = {
740 .owner = THIS_MODULE,
741 .open = idescsi_ide_open,
742 .release = idescsi_ide_release,
743 .ioctl = idescsi_ide_ioctl,
744};
745
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746static int idescsi_slave_configure(struct scsi_device * sdp)
747{
748 /* Configure detected device */
Boaz Harrosh427d0bd2007-09-18 12:27:43 +0200749 sdp->use_10_for_rw = 1;
750 sdp->use_10_for_ms = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
752 return 0;
753}
754
755static const char *idescsi_info (struct Scsi_Host *host)
756{
757 return "SCSI host adapter emulation for IDE ATAPI devices";
758}
759
760static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
761{
762 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
763
764 if (cmd == SG_SET_TRANSFORM) {
765 if (arg)
766 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
767 else
768 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
769 return 0;
770 } else if (cmd == SG_GET_TRANSFORM)
771 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
772 return -EINVAL;
773}
774
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775static int idescsi_queue (struct scsi_cmnd *cmd,
776 void (*done)(struct scsi_cmnd *))
777{
778 struct Scsi_Host *host = cmd->device->host;
779 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
780 ide_drive_t *drive = scsi->drive;
781 struct request *rq = NULL;
782 idescsi_pc_t *pc = NULL;
783
784 if (!drive) {
Jeff Garzik017560f2005-10-24 18:04:36 -0400785 scmd_printk (KERN_ERR, cmd, "drive not present\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 goto abort;
787 }
788 scsi = drive_to_idescsi(drive);
789 pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
790 rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
791 if (rq == NULL || pc == NULL) {
792 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
793 goto abort;
794 }
795
796 memset (pc->c, 0, 12);
797 pc->flags = 0;
798 pc->rq = rq;
799 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
Boaz Harrosh427d0bd2007-09-18 12:27:43 +0200800 pc->buffer = NULL;
801 pc->sg = scsi_sglist(cmd);
Jens Axboec79d88b2007-10-17 13:16:35 +0200802 pc->sg_cnt = scsi_sg_count(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 pc->b_count = 0;
Boaz Harrosh427d0bd2007-09-18 12:27:43 +0200804 pc->request_transfer = pc->buffer_size = scsi_bufflen(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 pc->scsi_cmd = cmd;
806 pc->done = done;
807 pc->timeout = jiffies + cmd->timeout_per_command;
808
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
810 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
Bartlomiej Zolnierkiewicz69ae6fe2007-12-12 23:31:57 +0100811 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
813 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
Bartlomiej Zolnierkiewicz69ae6fe2007-12-12 23:31:57 +0100814 ide_scsi_hex_dump(pc->c, 12);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 }
816 }
817
818 ide_init_drive_cmd (rq);
819 rq->special = (char *) pc;
Jens Axboe4aff5e22006-08-10 08:44:47 +0200820 rq->cmd_type = REQ_TYPE_SPECIAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 spin_unlock_irq(host->host_lock);
822 rq->rq_disk = scsi->disk;
823 (void) ide_do_drive_cmd (drive, rq, ide_end);
824 spin_lock_irq(host->host_lock);
825 return 0;
826abort:
Jesper Juhlc9475cb2005-11-07 01:01:26 -0800827 kfree (pc);
828 kfree (rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 cmd->result = DID_ERROR << 16;
830 done(cmd);
831 return 0;
832}
833
834static int idescsi_eh_abort (struct scsi_cmnd *cmd)
835{
836 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
837 ide_drive_t *drive = scsi->drive;
838 int busy;
839 int ret = FAILED;
840
841 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
842
843 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
844 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
845
846 if (!drive) {
847 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
848 WARN_ON(1);
849 goto no_drive;
850 }
851
852 /* First give it some more time, how much is "right" is hard to say :-( */
853
854 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
855 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
856 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
857
858 spin_lock_irq(&ide_lock);
859
860 /* If there is no pc running we're done (our interrupt took care of it) */
861 if (!scsi->pc) {
862 ret = SUCCESS;
863 goto ide_unlock;
864 }
865
866 /* It's somewhere in flight. Does ide subsystem agree? */
867 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
868 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
869 /*
870 * FIXME - not sure this condition can ever occur
871 */
872 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
873
Jens Axboe4aff5e22006-08-10 08:44:47 +0200874 if (blk_sense_request(scsi->pc->rq))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 kfree(scsi->pc->buffer);
876 kfree(scsi->pc->rq);
877 kfree(scsi->pc);
878 scsi->pc = NULL;
879
880 ret = SUCCESS;
881 }
882
883ide_unlock:
884 spin_unlock_irq(&ide_lock);
885no_drive:
886 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
887 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
888
889 return ret;
890}
891
892static int idescsi_eh_reset (struct scsi_cmnd *cmd)
893{
894 struct request *req;
895 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
896 ide_drive_t *drive = scsi->drive;
897 int ready = 0;
898 int ret = SUCCESS;
899
900 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
901
902 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
903 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
904
905 if (!drive) {
906 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
907 WARN_ON(1);
908 return FAILED;
909 }
910
Jeff Garzik df0ae242005-05-28 07:57:14 -0400911 spin_lock_irq(cmd->device->host->host_lock);
912 spin_lock(&ide_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913
914 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
915 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
916 spin_unlock(&ide_lock);
Jeff Garzik df0ae242005-05-28 07:57:14 -0400917 spin_unlock_irq(cmd->device->host->host_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 return FAILED;
919 }
920
921 /* kill current request */
922 blkdev_dequeue_request(req);
Tejun Heo8ffdc652006-01-06 09:49:03 +0100923 end_that_request_last(req, 0);
Jens Axboe4aff5e22006-08-10 08:44:47 +0200924 if (blk_sense_request(req))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 kfree(scsi->pc->buffer);
926 kfree(scsi->pc);
927 scsi->pc = NULL;
928 kfree(req);
929
930 /* now nuke the drive queue */
931 while ((req = elv_next_request(drive->queue))) {
932 blkdev_dequeue_request(req);
Tejun Heo8ffdc652006-01-06 09:49:03 +0100933 end_that_request_last(req, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 }
935
936 HWGROUP(drive)->rq = NULL;
937 HWGROUP(drive)->handler = NULL;
938 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
Jeff Garzik df0ae242005-05-28 07:57:14 -0400939 spin_unlock(&ide_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940
941 ide_do_reset(drive);
942
943 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
944
945 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 spin_unlock_irq(cmd->device->host->host_lock);
Jeff Garzik df0ae242005-05-28 07:57:14 -0400947 msleep(50);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 spin_lock_irq(cmd->device->host->host_lock);
949 } while ( HWGROUP(drive)->handler );
950
951 ready = drive_is_ready(drive);
952 HWGROUP(drive)->busy--;
953 if (!ready) {
954 printk (KERN_ERR "ide-scsi: reset failed!\n");
955 ret = FAILED;
956 }
957
Jeff Garzik df0ae242005-05-28 07:57:14 -0400958 spin_unlock_irq(cmd->device->host->host_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 return ret;
960}
961
962static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
963 sector_t capacity, int *parm)
964{
965 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
966 ide_drive_t *drive = idescsi->drive;
967
968 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
969 parm[0] = drive->bios_head;
970 parm[1] = drive->bios_sect;
971 parm[2] = drive->bios_cyl;
972 }
973 return 0;
974}
975
976static struct scsi_host_template idescsi_template = {
977 .module = THIS_MODULE,
978 .name = "idescsi",
979 .info = idescsi_info,
980 .slave_configure = idescsi_slave_configure,
981 .ioctl = idescsi_ioctl,
982 .queuecommand = idescsi_queue,
983 .eh_abort_handler = idescsi_eh_abort,
984 .eh_host_reset_handler = idescsi_eh_reset,
985 .bios_param = idescsi_bios,
986 .can_queue = 40,
987 .this_id = -1,
988 .sg_tablesize = 256,
989 .cmd_per_lun = 5,
990 .max_sectors = 128,
991 .use_clustering = DISABLE_CLUSTERING,
992 .emulated = 1,
993 .proc_name = "ide-scsi",
994};
995
Mikael Petterssonb62735d2006-02-01 03:04:45 -0800996static int ide_scsi_probe(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997{
998 idescsi_scsi_t *idescsi;
999 struct Scsi_Host *host;
1000 struct gendisk *g;
1001 static int warned;
1002 int err = -ENOMEM;
1003
1004 if (!warned && drive->media == ide_cdrom) {
1005 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1006 warned = 1;
1007 }
1008
Alan Coxaaeab802006-12-06 20:39:33 -08001009 if (idescsi_nocd && drive->media == ide_cdrom)
1010 return -ENODEV;
1011
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 if (!strstr("ide-scsi", drive->driver_req) ||
1013 !drive->present ||
1014 drive->media == ide_disk ||
1015 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001016 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017
1018 g = alloc_disk(1 << PARTN_BITS);
1019 if (!g)
1020 goto out_host_put;
1021
1022 ide_init_disk(g, drive);
1023
1024 host->max_id = 1;
1025
1026#if IDESCSI_DEBUG_LOG
1027 if (drive->id->last_lun)
1028 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1029#endif
1030 if ((drive->id->last_lun & 0x7) != 7)
1031 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1032 else
1033 host->max_lun = 1;
1034
1035 drive->driver_data = host;
1036 idescsi = scsihost_to_idescsi(host);
1037 idescsi->drive = drive;
1038 idescsi->driver = &idescsi_driver;
1039 idescsi->host = host;
1040 idescsi->disk = g;
1041 g->private_data = &idescsi->driver;
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02001042 ide_proc_register_driver(drive, &idescsi_driver);
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001043 err = 0;
1044 idescsi_setup(drive, idescsi);
1045 g->fops = &idescsi_ops;
1046 ide_register_region(g);
1047 err = scsi_add_host(host, &drive->gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 if (!err) {
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001049 scsi_scan_host(host);
1050 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 }
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001052 /* fall through on error */
1053 ide_unregister_region(g);
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02001054 ide_proc_unregister_driver(drive, &idescsi_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055
1056 put_disk(g);
1057out_host_put:
1058 scsi_host_put(host);
1059 return err;
1060}
1061
1062static int __init init_idescsi_module(void)
1063{
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001064 return driver_register(&idescsi_driver.gen_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065}
1066
1067static void __exit exit_idescsi_module(void)
1068{
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001069 driver_unregister(&idescsi_driver.gen_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070}
1071
Alan Coxaaeab802006-12-06 20:39:33 -08001072module_param(idescsi_nocd, int, 0600);
1073MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074module_init(init_idescsi_module);
1075module_exit(exit_idescsi_module);
1076MODULE_LICENSE("GPL");