blob: 68e5c632c5d55ca7b909643c3cf2f2a1adff3889 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Bartlomiej Zolnierkiewicz59bca8c2008-02-01 23:09:33 +01002 * Copyright (C) 1996-1999 Gadi Oxman <gadio@netvision.net.il>
3 * Copyright (C) 2004-2005 Bartlomiej Zolnierkiewicz
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 */
5
6/*
7 * Emulation of a SCSI host adapter for IDE ATAPI devices.
8 *
9 * With this driver, one can use the Linux SCSI drivers instead of the
10 * native IDE ATAPI drivers.
11 *
12 * Ver 0.1 Dec 3 96 Initial version.
13 * Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation
14 * of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
15 * to Janos Farkas for pointing this out.
16 * Avoid using bitfields in structures for m68k.
17 * Added Scatter/Gather and DMA support.
18 * Ver 0.4 Dec 7 97 Add support for ATAPI PD/CD drives.
19 * Use variable timeout for each command.
20 * Ver 0.5 Jan 2 98 Fix previous PD/CD support.
21 * Allow disabling of SCSI-6 to SCSI-10 transformation.
22 * Ver 0.6 Jan 27 98 Allow disabling of SCSI command translation layer
23 * for access through /dev/sg.
24 * Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
25 * Ver 0.7 Dec 04 98 Ignore commands where lun != 0 to avoid multiple
26 * detection of devices with CONFIG_SCSI_MULTI_LUN
27 * Ver 0.8 Feb 05 99 Optical media need translation too. Reverse 0.7.
28 * Ver 0.9 Jul 04 99 Fix a bug in SG_SET_TRANSFORM.
29 * Ver 0.91 Jun 10 02 Fix "off by one" error in transforms
30 * Ver 0.92 Dec 31 02 Implement new SCSI mid level API
31 */
32
33#define IDESCSI_VERSION "0.92"
34
35#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/types.h>
37#include <linux/string.h>
38#include <linux/kernel.h>
39#include <linux/mm.h>
40#include <linux/ioport.h>
41#include <linux/blkdev.h>
42#include <linux/errno.h>
43#include <linux/hdreg.h>
44#include <linux/slab.h>
45#include <linux/ide.h>
46#include <linux/scatterlist.h>
Jeff Garzik df0ae242005-05-28 07:57:14 -040047#include <linux/delay.h>
Jes Sorensene723ccd2006-03-23 03:00:22 -080048#include <linux/mutex.h>
Jiri Slaby1977f032007-10-18 23:40:25 -070049#include <linux/bitops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <asm/uaccess.h>
53
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>
59#include <scsi/sg.h>
60
61#define IDESCSI_DEBUG_LOG 0
62
63typedef 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 */
Jens Axboec79d88b2007-10-17 13:16:35 +020072 unsigned int sg_cnt; /* Number of entries in sg */
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 int b_count; /* Bytes transferred from current entry */
74 struct scsi_cmnd *scsi_cmd; /* SCSI command */
75 void (*done)(struct scsi_cmnd *); /* Scsi completion routine */
76 unsigned long flags; /* Status/Action flags */
77 unsigned long timeout; /* Command timeout */
78} idescsi_pc_t;
79
80/*
81 * Packet command status bits.
82 */
83#define PC_DMA_IN_PROGRESS 0 /* 1 while DMA in progress */
84#define PC_WRITING 1 /* Data direction */
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#define PC_TIMEDOUT 3 /* command timed out */
86#define PC_DMA_OK 4 /* Use DMA */
87
88/*
89 * SCSI command transformation layer
90 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070091#define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
92
93/*
94 * Log flags
95 */
96#define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
97
98typedef struct ide_scsi_obj {
99 ide_drive_t *drive;
100 ide_driver_t *driver;
101 struct gendisk *disk;
102 struct Scsi_Host *host;
103
104 idescsi_pc_t *pc; /* Current packet command */
105 unsigned long flags; /* Status/Action flags */
106 unsigned long transform; /* SCSI cmd translation layer */
107 unsigned long log; /* log flags */
108} idescsi_scsi_t;
109
Jes Sorensene723ccd2006-03-23 03:00:22 -0800110static DEFINE_MUTEX(idescsi_ref_mutex);
Alan Coxaaeab802006-12-06 20:39:33 -0800111static int idescsi_nocd; /* Set by module param to skip cd */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113#define ide_scsi_g(disk) \
114 container_of((disk)->private_data, struct ide_scsi_obj, driver)
115
116static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
117{
118 struct ide_scsi_obj *scsi = NULL;
119
Jes Sorensene723ccd2006-03-23 03:00:22 -0800120 mutex_lock(&idescsi_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 scsi = ide_scsi_g(disk);
122 if (scsi)
123 scsi_host_get(scsi->host);
Jes Sorensene723ccd2006-03-23 03:00:22 -0800124 mutex_unlock(&idescsi_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 return scsi;
126}
127
128static void ide_scsi_put(struct ide_scsi_obj *scsi)
129{
Jes Sorensene723ccd2006-03-23 03:00:22 -0800130 mutex_lock(&idescsi_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 scsi_host_put(scsi->host);
Jes Sorensene723ccd2006-03-23 03:00:22 -0800132 mutex_unlock(&idescsi_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133}
134
135static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
136{
137 return (idescsi_scsi_t*) (&host[1]);
138}
139
140static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
141{
142 return scsihost_to_idescsi(ide_drive->driver_data);
143}
144
145/*
146 * Per ATAPI device status bits.
147 */
148#define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
149
150/*
151 * ide-scsi requests.
152 */
153#define IDESCSI_PC_RQ 90
154
155static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
156{
157 while (bcount--)
158 (void) HWIF(drive)->INB(IDE_DATA_REG);
159}
160
161static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
162{
163 while (bcount--)
164 HWIF(drive)->OUTB(0, IDE_DATA_REG);
165}
166
167/*
168 * PIO data transfer routines using the scatter gather table.
169 */
170static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
171{
172 int count;
173 char *buf;
174
175 while (bcount) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 count = min(pc->sg->length - pc->b_count, bcount);
Jens Axboe45711f12007-10-22 21:19:53 +0200177 if (PageHighMem(sg_page(pc->sg))) {
Andrew Mortona717f772005-10-31 14:08:53 -0800178 unsigned long flags;
179
180 local_irq_save(flags);
Jens Axboe45711f12007-10-22 21:19:53 +0200181 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
Andrew Mortona717f772005-10-31 14:08:53 -0800182 pc->sg->offset;
183 drive->hwif->atapi_input_bytes(drive,
184 buf + pc->b_count, count);
185 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
186 local_irq_restore(flags);
187 } else {
Jens Axboe45711f12007-10-22 21:19:53 +0200188 buf = sg_virt(pc->sg);
Andrew Mortona717f772005-10-31 14:08:53 -0800189 drive->hwif->atapi_input_bytes(drive,
190 buf + pc->b_count, count);
191 }
192 bcount -= count; pc->b_count += count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 if (pc->b_count == pc->sg->length) {
Jens Axboec79d88b2007-10-17 13:16:35 +0200194 if (!--pc->sg_cnt)
Jens Axboed274a982007-10-16 11:20:52 +0200195 break;
196 pc->sg = sg_next(pc->sg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 pc->b_count = 0;
198 }
199 }
Jens Axboed274a982007-10-16 11:20:52 +0200200
201 if (bcount) {
202 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
203 idescsi_discard_data (drive, bcount);
204 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205}
206
207static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
208{
209 int count;
210 char *buf;
211
212 while (bcount) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 count = min(pc->sg->length - pc->b_count, bcount);
Jens Axboe45711f12007-10-22 21:19:53 +0200214 if (PageHighMem(sg_page(pc->sg))) {
Andrew Mortona717f772005-10-31 14:08:53 -0800215 unsigned long flags;
216
217 local_irq_save(flags);
Jens Axboe45711f12007-10-22 21:19:53 +0200218 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
Andrew Mortona717f772005-10-31 14:08:53 -0800219 pc->sg->offset;
220 drive->hwif->atapi_output_bytes(drive,
221 buf + pc->b_count, count);
222 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
223 local_irq_restore(flags);
224 } else {
Jens Axboe45711f12007-10-22 21:19:53 +0200225 buf = sg_virt(pc->sg);
Andrew Mortona717f772005-10-31 14:08:53 -0800226 drive->hwif->atapi_output_bytes(drive,
227 buf + pc->b_count, count);
228 }
229 bcount -= count; pc->b_count += count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 if (pc->b_count == pc->sg->length) {
Jens Axboec79d88b2007-10-17 13:16:35 +0200231 if (!--pc->sg_cnt)
Jens Axboed274a982007-10-16 11:20:52 +0200232 break;
233 pc->sg = sg_next(pc->sg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 pc->b_count = 0;
235 }
236 }
Jens Axboed274a982007-10-16 11:20:52 +0200237
238 if (bcount) {
239 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
240 idescsi_output_zeros (drive, bcount);
241 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242}
243
Bartlomiej Zolnierkiewicz69ae6fe2007-12-12 23:31:57 +0100244static void ide_scsi_hex_dump(u8 *data, int len)
245{
246 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
247}
248
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
250{
251 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
252 idescsi_pc_t *pc;
253 struct request *rq;
254 u8 *buf;
255
256 /* stuff a sense request in front of our current request */
Mariusz Kozlowski41ead3c2007-08-01 23:46:45 +0200257 pc = kzalloc(sizeof(idescsi_pc_t), GFP_ATOMIC);
258 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
259 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
260 if (!pc || !rq || !buf) {
Jesper Juhlc9475cb2005-11-07 01:01:26 -0800261 kfree(buf);
262 kfree(rq);
263 kfree(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 return -ENOMEM;
265 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 ide_init_drive_cmd(rq);
267 rq->special = (char *) pc;
268 pc->rq = rq;
269 pc->buffer = buf;
270 pc->c[0] = REQUEST_SENSE;
271 pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
Jens Axboe4aff5e22006-08-10 08:44:47 +0200272 rq->cmd_type = REQ_TYPE_SENSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 pc->timeout = jiffies + WAIT_READY;
274 /* NOTE! Save the failed packet command in "rq->buffer" */
275 rq->buffer = (void *) failed_command->special;
276 pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
277 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
278 printk ("ide-scsi: %s: queue cmd = ", drive->name);
Bartlomiej Zolnierkiewicz69ae6fe2007-12-12 23:31:57 +0100279 ide_scsi_hex_dump(pc->c, 6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 }
281 rq->rq_disk = scsi->disk;
282 return ide_do_drive_cmd(drive, rq, ide_preempt);
283}
284
285static int idescsi_end_request(ide_drive_t *, int, int);
286
287static ide_startstop_t
288idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
289{
Bartlomiej Zolnierkiewiczc47137a2008-02-06 02:57:51 +0100290 if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 /* force an abort */
292 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
293
294 rq->errors++;
295
296 idescsi_end_request(drive, 0, 0);
297
298 return ide_stopped;
299}
300
301static ide_startstop_t
302idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
303{
304#if IDESCSI_DEBUG_LOG
305 printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
306 ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
307#endif
308 rq->errors |= ERROR_MAX;
309
310 idescsi_end_request(drive, 0, 0);
311
312 return ide_stopped;
313}
314
315static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
316{
317 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
318 struct request *rq = HWGROUP(drive)->rq;
319 idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
320 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
321 struct Scsi_Host *host;
Willem Riede32565342005-10-31 00:03:49 +0000322 int errors = rq->errors;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 unsigned long flags;
324
Jens Axboe4aff5e22006-08-10 08:44:47 +0200325 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 ide_end_request(drive, uptodate, nrsecs);
327 return 0;
328 }
329 ide_end_drive_cmd (drive, 0, 0);
Jens Axboe4aff5e22006-08-10 08:44:47 +0200330 if (blk_sense_request(rq)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
332 if (log) {
333 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
Bartlomiej Zolnierkiewicz69ae6fe2007-12-12 23:31:57 +0100334 ide_scsi_hex_dump(pc->buffer, 16);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 }
336 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
337 kfree(pc->buffer);
338 kfree(pc);
339 kfree(rq);
340 pc = opc;
341 rq = pc->rq;
342 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
343 ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
344 } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
345 if (log)
346 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
347 drive->name, pc->scsi_cmd->serial_number);
348 pc->scsi_cmd->result = DID_TIME_OUT << 16;
Willem Riede32565342005-10-31 00:03:49 +0000349 } else if (errors >= ERROR_MAX) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 pc->scsi_cmd->result = DID_ERROR << 16;
351 if (log)
352 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
Willem Riede32565342005-10-31 00:03:49 +0000353 } else if (errors) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 if (log)
355 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
356 if (!idescsi_check_condition(drive, rq))
357 /* we started a request sense, so we'll be back, exit for now */
358 return 0;
359 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
360 } else {
361 pc->scsi_cmd->result = DID_OK << 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 }
363 host = pc->scsi_cmd->device->host;
364 spin_lock_irqsave(host->host_lock, flags);
365 pc->done(pc->scsi_cmd);
366 spin_unlock_irqrestore(host->host_lock, flags);
367 kfree(pc);
368 kfree(rq);
369 scsi->pc = NULL;
370 return 0;
371}
372
373static inline unsigned long get_timeout(idescsi_pc_t *pc)
374{
375 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
376}
377
378static int idescsi_expiry(ide_drive_t *drive)
379{
Bartlomiej Zolnierkiewiczd1be0a82007-06-16 02:24:44 +0200380 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 idescsi_pc_t *pc = scsi->pc;
382
383#if IDESCSI_DEBUG_LOG
384 printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
385#endif
386 set_bit(PC_TIMEDOUT, &pc->flags);
387
388 return 0; /* we do not want the ide subsystem to retry */
389}
390
391/*
392 * Our interrupt handler.
393 */
394static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
395{
396 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100397 ide_hwif_t *hwif = drive->hwif;
398 idescsi_pc_t *pc = scsi->pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 struct request *rq = pc->rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 unsigned int temp;
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100401 u16 bcount;
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100402 u8 stat, ireason;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
404#if IDESCSI_DEBUG_LOG
405 printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
406#endif /* IDESCSI_DEBUG_LOG */
407
408 if (test_bit(PC_TIMEDOUT, &pc->flags)){
409#if IDESCSI_DEBUG_LOG
410 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
411 pc->scsi_cmd->serial_number, jiffies);
412#endif
413 /* end this request now - scsi should retry it*/
414 idescsi_end_request (drive, 1, 0);
415 return ide_stopped;
416 }
417 if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
418#if IDESCSI_DEBUG_LOG
419 printk ("ide-scsi: %s: DMA complete\n", drive->name);
420#endif /* IDESCSI_DEBUG_LOG */
421 pc->actually_transferred=pc->request_transfer;
422 (void) HWIF(drive)->ide_dma_end(drive);
423 }
424
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 /* Clear the interrupt */
Bartlomiej Zolnierkiewiczc47137a2008-02-06 02:57:51 +0100426 stat = ide_read_status(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +0100428 if ((stat & DRQ_STAT) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 /* No more interrupts */
430 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
431 printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
Ingo Molnar36e8e572006-08-27 01:23:56 -0700432 local_irq_enable_in_hardirq();
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +0100433 if (stat & ERR_STAT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 rq->errors++;
435 idescsi_end_request (drive, 1, 0);
436 return ide_stopped;
437 }
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100438 bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) |
439 hwif->INB(IDE_BCOUNTL_REG);
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100440 ireason = hwif->INB(IDE_IREASON_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100442 if (ireason & CD) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
444 return ide_do_reset (drive);
445 }
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100446 if (ireason & IO) {
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100447 temp = pc->actually_transferred + bcount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 if (temp > pc->request_transfer) {
449 if (temp > pc->buffer_size) {
450 printk(KERN_ERR "ide-scsi: The scsi wants to "
451 "send us more data than expected "
452 "- discarding data\n");
453 temp = pc->buffer_size - pc->actually_transferred;
454 if (temp) {
455 clear_bit(PC_WRITING, &pc->flags);
456 if (pc->sg)
457 idescsi_input_buffers(drive, pc, temp);
458 else
459 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100460 printk(KERN_ERR "ide-scsi: transferred"
461 " %d of %d bytes\n",
462 temp, bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 }
464 pc->actually_transferred += temp;
465 pc->current_position += temp;
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100466 idescsi_discard_data(drive, bcount - temp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
468 return ide_started;
469 }
470#if IDESCSI_DEBUG_LOG
471 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
472#endif /* IDESCSI_DEBUG_LOG */
473 }
474 }
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100475 if (ireason & IO) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 clear_bit(PC_WRITING, &pc->flags);
477 if (pc->sg)
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100478 idescsi_input_buffers(drive, pc, bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 else
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100480 hwif->atapi_input_bytes(drive, pc->current_position,
481 bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 } else {
483 set_bit(PC_WRITING, &pc->flags);
484 if (pc->sg)
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100485 idescsi_output_buffers(drive, pc, bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 else
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100487 hwif->atapi_output_bytes(drive, pc->current_position,
488 bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 }
490 /* Update the current position */
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100491 pc->actually_transferred += bcount;
492 pc->current_position += bcount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
494 /* And set the interrupt handler again */
495 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
496 return ide_started;
497}
498
499static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
500{
501 ide_hwif_t *hwif = drive->hwif;
502 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
503 idescsi_pc_t *pc = scsi->pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 ide_startstop_t startstop;
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100505 u8 ireason;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
507 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
508 printk(KERN_ERR "ide-scsi: Strange, packet command "
509 "initiated yet DRQ isn't asserted\n");
510 return startstop;
511 }
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100512 ireason = hwif->INB(IDE_IREASON_REG);
513 if ((ireason & CD) == 0 || (ireason & IO)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
515 "issuing a packet command\n");
516 return ide_do_reset (drive);
517 }
Eric Sesterhenn125e1872006-06-23 02:06:06 -0700518 BUG_ON(HWGROUP(drive)->handler != NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 /* Set the interrupt routine */
520 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
521 /* Send the actual packet */
522 drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
523 if (test_bit (PC_DMA_OK, &pc->flags)) {
524 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
525 hwif->dma_start(drive);
526 }
527 return ide_started;
528}
529
530static inline int idescsi_set_direction(idescsi_pc_t *pc)
531{
532 switch (pc->c[0]) {
533 case READ_6: case READ_10: case READ_12:
534 clear_bit(PC_WRITING, &pc->flags);
535 return 0;
536 case WRITE_6: case WRITE_10: case WRITE_12:
537 set_bit(PC_WRITING, &pc->flags);
538 return 0;
539 default:
540 return 1;
541 }
542}
543
544static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
545{
546 ide_hwif_t *hwif = drive->hwif;
547 struct scatterlist *sg, *scsi_sg;
548 int segments;
549
550 if (!pc->request_transfer || pc->request_transfer % 1024)
551 return 1;
552
553 if (idescsi_set_direction(pc))
554 return 1;
555
556 sg = hwif->sg_table;
Boaz Harrosh427d0bd2007-09-18 12:27:43 +0200557 scsi_sg = scsi_sglist(pc->scsi_cmd);
558 segments = scsi_sg_count(pc->scsi_cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
560 if (segments > hwif->sg_max_nents)
561 return 1;
562
Boaz Harrosh427d0bd2007-09-18 12:27:43 +0200563 hwif->sg_nents = segments;
564 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
566 return 0;
567}
568
569/*
570 * Issue a packet command
571 */
572static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
573{
574 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
575 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100576 u16 bcount;
Bartlomiej Zolnierkiewicze5f9f5a2008-01-25 22:17:12 +0100577 u8 dma = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
579 scsi->pc=pc; /* Set the current packet command */
580 pc->actually_transferred=0; /* We haven't transferred any data yet */
581 pc->current_position=pc->buffer;
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100582 /* Request to transfer the entire buffer at once */
583 bcount = min(pc->request_transfer, 63 * 1024);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
586 hwif->sg_mapped = 1;
Bartlomiej Zolnierkiewicze5f9f5a2008-01-25 22:17:12 +0100587 dma = !hwif->dma_setup(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 hwif->sg_mapped = 0;
589 }
590
Bartlomiej Zolnierkiewicz2fc57382008-01-25 22:17:13 +0100591 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK, bcount, dma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
Bartlomiej Zolnierkiewicze5f9f5a2008-01-25 22:17:12 +0100593 if (dma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 set_bit(PC_DMA_OK, &pc->flags);
595
596 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
Bartlomiej Zolnierkiewicz2d6027f2008-02-02 19:56:44 +0100597 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
598 get_timeout(pc), idescsi_expiry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 return ide_started;
600 } else {
601 /* Issue the packet command */
602 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
603 return idescsi_transfer_pc(drive);
604 }
605}
606
607/*
608 * idescsi_do_request is our request handling function.
609 */
610static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
611{
612#if IDESCSI_DEBUG_LOG
Jens Axboecdd60262006-07-28 09:32:07 +0200613 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 -0700614 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
615#endif /* IDESCSI_DEBUG_LOG */
616
Jens Axboe4aff5e22006-08-10 08:44:47 +0200617 if (blk_sense_request(rq) || blk_special_request(rq)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
619 }
620 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
621 idescsi_end_request (drive, 0, 0);
622 return ide_stopped;
623}
624
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +0200625#ifdef CONFIG_IDE_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626static void idescsi_add_settings(ide_drive_t *drive)
627{
628 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
629
630/*
Bartlomiej Zolnierkiewicz14979432007-05-10 00:01:10 +0200631 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 */
Bartlomiej Zolnierkiewicz14979432007-05-10 00:01:10 +0200633 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
634 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
635 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
636 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
637 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638}
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +0200639#else
640static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
641#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
643/*
644 * Driver initialization.
645 */
646static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
647{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 if (drive->id && (drive->id->config & 0x0060) == 0x20)
649 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
651#if IDESCSI_DEBUG_LOG
652 set_bit(IDESCSI_LOG_CMD, &scsi->log);
653#endif /* IDESCSI_DEBUG_LOG */
654 idescsi_add_settings(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655}
656
Mikael Petterssonb62735d2006-02-01 03:04:45 -0800657static void ide_scsi_remove(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658{
659 struct Scsi_Host *scsihost = drive->driver_data;
660 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
661 struct gendisk *g = scsi->disk;
662
Matthew Wilcox6fdea8d2007-08-15 12:57:01 -0600663 scsi_remove_host(scsihost);
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +0200664 ide_proc_unregister_driver(drive, scsi->driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665
666 ide_unregister_region(g);
667
668 drive->driver_data = NULL;
669 g->private_data = NULL;
670 put_disk(g);
671
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 ide_scsi_put(scsi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673}
674
Mikael Petterssonb62735d2006-02-01 03:04:45 -0800675static int ide_scsi_probe(ide_drive_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
Bartlomiej Zolnierkiewiczecfd80e2007-05-10 00:01:09 +0200677#ifdef CONFIG_IDE_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678static ide_proc_entry_t idescsi_proc[] = {
679 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
680 { NULL, 0, NULL, NULL }
681};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682#endif
683
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684static ide_driver_t idescsi_driver = {
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +0200685 .gen_driver = {
Laurent Riffard4ef3b8f2005-11-18 22:15:40 +0100686 .owner = THIS_MODULE,
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +0200687 .name = "ide-scsi",
688 .bus = &ide_bus_type,
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +0200689 },
Mikael Petterssonb62735d2006-02-01 03:04:45 -0800690 .probe = ide_scsi_probe,
691 .remove = ide_scsi_remove,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 .version = IDESCSI_VERSION,
693 .media = ide_scsi,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 .supports_dsc_overlap = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 .do_request = idescsi_do_request,
696 .end_request = idescsi_end_request,
697 .error = idescsi_atapi_error,
698 .abort = idescsi_atapi_abort,
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +0200699#ifdef CONFIG_IDE_PROC_FS
700 .proc = idescsi_proc,
701#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702};
703
704static int idescsi_ide_open(struct inode *inode, struct file *filp)
705{
706 struct gendisk *disk = inode->i_bdev->bd_disk;
707 struct ide_scsi_obj *scsi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
709 if (!(scsi = ide_scsi_get(disk)))
710 return -ENXIO;
711
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 return 0;
713}
714
715static int idescsi_ide_release(struct inode *inode, struct file *filp)
716{
717 struct gendisk *disk = inode->i_bdev->bd_disk;
718 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
720 ide_scsi_put(scsi);
721
722 return 0;
723}
724
725static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
726 unsigned int cmd, unsigned long arg)
727{
728 struct block_device *bdev = inode->i_bdev;
729 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
730 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
731}
732
733static struct block_device_operations idescsi_ops = {
734 .owner = THIS_MODULE,
735 .open = idescsi_ide_open,
736 .release = idescsi_ide_release,
737 .ioctl = idescsi_ide_ioctl,
738};
739
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740static int idescsi_slave_configure(struct scsi_device * sdp)
741{
742 /* Configure detected device */
Boaz Harrosh427d0bd2007-09-18 12:27:43 +0200743 sdp->use_10_for_rw = 1;
744 sdp->use_10_for_ms = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
746 return 0;
747}
748
749static const char *idescsi_info (struct Scsi_Host *host)
750{
751 return "SCSI host adapter emulation for IDE ATAPI devices";
752}
753
754static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
755{
756 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
757
758 if (cmd == SG_SET_TRANSFORM) {
759 if (arg)
760 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
761 else
762 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
763 return 0;
764 } else if (cmd == SG_GET_TRANSFORM)
765 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
766 return -EINVAL;
767}
768
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769static int idescsi_queue (struct scsi_cmnd *cmd,
770 void (*done)(struct scsi_cmnd *))
771{
772 struct Scsi_Host *host = cmd->device->host;
773 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
774 ide_drive_t *drive = scsi->drive;
775 struct request *rq = NULL;
776 idescsi_pc_t *pc = NULL;
777
778 if (!drive) {
Jeff Garzik017560f2005-10-24 18:04:36 -0400779 scmd_printk (KERN_ERR, cmd, "drive not present\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 goto abort;
781 }
782 scsi = drive_to_idescsi(drive);
783 pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
784 rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
785 if (rq == NULL || pc == NULL) {
786 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
787 goto abort;
788 }
789
790 memset (pc->c, 0, 12);
791 pc->flags = 0;
792 pc->rq = rq;
793 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
Boaz Harrosh427d0bd2007-09-18 12:27:43 +0200794 pc->buffer = NULL;
795 pc->sg = scsi_sglist(cmd);
Jens Axboec79d88b2007-10-17 13:16:35 +0200796 pc->sg_cnt = scsi_sg_count(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 pc->b_count = 0;
Boaz Harrosh427d0bd2007-09-18 12:27:43 +0200798 pc->request_transfer = pc->buffer_size = scsi_bufflen(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 pc->scsi_cmd = cmd;
800 pc->done = done;
801 pc->timeout = jiffies + cmd->timeout_per_command;
802
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
804 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
Bartlomiej Zolnierkiewicz69ae6fe2007-12-12 23:31:57 +0100805 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
807 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
Bartlomiej Zolnierkiewicz69ae6fe2007-12-12 23:31:57 +0100808 ide_scsi_hex_dump(pc->c, 12);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 }
810 }
811
812 ide_init_drive_cmd (rq);
813 rq->special = (char *) pc;
Jens Axboe4aff5e22006-08-10 08:44:47 +0200814 rq->cmd_type = REQ_TYPE_SPECIAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 spin_unlock_irq(host->host_lock);
816 rq->rq_disk = scsi->disk;
817 (void) ide_do_drive_cmd (drive, rq, ide_end);
818 spin_lock_irq(host->host_lock);
819 return 0;
820abort:
Jesper Juhlc9475cb2005-11-07 01:01:26 -0800821 kfree (pc);
822 kfree (rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 cmd->result = DID_ERROR << 16;
824 done(cmd);
825 return 0;
826}
827
828static int idescsi_eh_abort (struct scsi_cmnd *cmd)
829{
830 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
831 ide_drive_t *drive = scsi->drive;
832 int busy;
833 int ret = FAILED;
834
835 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
836
837 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
838 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
839
840 if (!drive) {
841 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
842 WARN_ON(1);
843 goto no_drive;
844 }
845
846 /* First give it some more time, how much is "right" is hard to say :-( */
847
848 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
849 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
850 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
851
852 spin_lock_irq(&ide_lock);
853
854 /* If there is no pc running we're done (our interrupt took care of it) */
855 if (!scsi->pc) {
856 ret = SUCCESS;
857 goto ide_unlock;
858 }
859
860 /* It's somewhere in flight. Does ide subsystem agree? */
861 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
862 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
863 /*
864 * FIXME - not sure this condition can ever occur
865 */
866 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
867
Jens Axboe4aff5e22006-08-10 08:44:47 +0200868 if (blk_sense_request(scsi->pc->rq))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 kfree(scsi->pc->buffer);
870 kfree(scsi->pc->rq);
871 kfree(scsi->pc);
872 scsi->pc = NULL;
873
874 ret = SUCCESS;
875 }
876
877ide_unlock:
878 spin_unlock_irq(&ide_lock);
879no_drive:
880 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
881 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
882
883 return ret;
884}
885
886static int idescsi_eh_reset (struct scsi_cmnd *cmd)
887{
888 struct request *req;
889 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
890 ide_drive_t *drive = scsi->drive;
891 int ready = 0;
892 int ret = SUCCESS;
893
894 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
895
896 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
897 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
898
899 if (!drive) {
900 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
901 WARN_ON(1);
902 return FAILED;
903 }
904
Jeff Garzik df0ae242005-05-28 07:57:14 -0400905 spin_lock_irq(cmd->device->host->host_lock);
906 spin_lock(&ide_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907
908 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
909 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
910 spin_unlock(&ide_lock);
Jeff Garzik df0ae242005-05-28 07:57:14 -0400911 spin_unlock_irq(cmd->device->host->host_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 return FAILED;
913 }
914
915 /* kill current request */
Kiyoshi Ueda5a330e32007-12-11 17:49:29 -0500916 if (__blk_end_request(req, -EIO, 0))
917 BUG();
Jens Axboe4aff5e22006-08-10 08:44:47 +0200918 if (blk_sense_request(req))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 kfree(scsi->pc->buffer);
920 kfree(scsi->pc);
921 scsi->pc = NULL;
922 kfree(req);
923
924 /* now nuke the drive queue */
925 while ((req = elv_next_request(drive->queue))) {
Kiyoshi Ueda5a330e32007-12-11 17:49:29 -0500926 if (__blk_end_request(req, -EIO, 0))
927 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 }
929
930 HWGROUP(drive)->rq = NULL;
931 HWGROUP(drive)->handler = NULL;
932 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
Jeff Garzik df0ae242005-05-28 07:57:14 -0400933 spin_unlock(&ide_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
935 ide_do_reset(drive);
936
937 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
938
939 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 spin_unlock_irq(cmd->device->host->host_lock);
Jeff Garzik df0ae242005-05-28 07:57:14 -0400941 msleep(50);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 spin_lock_irq(cmd->device->host->host_lock);
943 } while ( HWGROUP(drive)->handler );
944
945 ready = drive_is_ready(drive);
946 HWGROUP(drive)->busy--;
947 if (!ready) {
948 printk (KERN_ERR "ide-scsi: reset failed!\n");
949 ret = FAILED;
950 }
951
Jeff Garzik df0ae242005-05-28 07:57:14 -0400952 spin_unlock_irq(cmd->device->host->host_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 return ret;
954}
955
956static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
957 sector_t capacity, int *parm)
958{
959 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
960 ide_drive_t *drive = idescsi->drive;
961
962 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
963 parm[0] = drive->bios_head;
964 parm[1] = drive->bios_sect;
965 parm[2] = drive->bios_cyl;
966 }
967 return 0;
968}
969
970static struct scsi_host_template idescsi_template = {
971 .module = THIS_MODULE,
972 .name = "idescsi",
973 .info = idescsi_info,
974 .slave_configure = idescsi_slave_configure,
975 .ioctl = idescsi_ioctl,
976 .queuecommand = idescsi_queue,
977 .eh_abort_handler = idescsi_eh_abort,
978 .eh_host_reset_handler = idescsi_eh_reset,
979 .bios_param = idescsi_bios,
980 .can_queue = 40,
981 .this_id = -1,
982 .sg_tablesize = 256,
983 .cmd_per_lun = 5,
984 .max_sectors = 128,
985 .use_clustering = DISABLE_CLUSTERING,
986 .emulated = 1,
987 .proc_name = "ide-scsi",
988};
989
Mikael Petterssonb62735d2006-02-01 03:04:45 -0800990static int ide_scsi_probe(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991{
992 idescsi_scsi_t *idescsi;
993 struct Scsi_Host *host;
994 struct gendisk *g;
995 static int warned;
996 int err = -ENOMEM;
997
998 if (!warned && drive->media == ide_cdrom) {
999 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1000 warned = 1;
1001 }
1002
Alan Coxaaeab802006-12-06 20:39:33 -08001003 if (idescsi_nocd && drive->media == ide_cdrom)
1004 return -ENODEV;
1005
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 if (!strstr("ide-scsi", drive->driver_req) ||
1007 !drive->present ||
1008 drive->media == ide_disk ||
1009 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001010 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011
1012 g = alloc_disk(1 << PARTN_BITS);
1013 if (!g)
1014 goto out_host_put;
1015
1016 ide_init_disk(g, drive);
1017
1018 host->max_id = 1;
1019
1020#if IDESCSI_DEBUG_LOG
1021 if (drive->id->last_lun)
1022 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1023#endif
1024 if ((drive->id->last_lun & 0x7) != 7)
1025 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1026 else
1027 host->max_lun = 1;
1028
1029 drive->driver_data = host;
1030 idescsi = scsihost_to_idescsi(host);
1031 idescsi->drive = drive;
1032 idescsi->driver = &idescsi_driver;
1033 idescsi->host = host;
1034 idescsi->disk = g;
1035 g->private_data = &idescsi->driver;
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02001036 ide_proc_register_driver(drive, &idescsi_driver);
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001037 err = 0;
1038 idescsi_setup(drive, idescsi);
1039 g->fops = &idescsi_ops;
1040 ide_register_region(g);
1041 err = scsi_add_host(host, &drive->gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 if (!err) {
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001043 scsi_scan_host(host);
1044 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 }
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001046 /* fall through on error */
1047 ide_unregister_region(g);
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02001048 ide_proc_unregister_driver(drive, &idescsi_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049
1050 put_disk(g);
1051out_host_put:
1052 scsi_host_put(host);
1053 return err;
1054}
1055
1056static int __init init_idescsi_module(void)
1057{
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001058 return driver_register(&idescsi_driver.gen_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059}
1060
1061static void __exit exit_idescsi_module(void)
1062{
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001063 driver_unregister(&idescsi_driver.gen_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064}
1065
Alan Coxaaeab802006-12-06 20:39:33 -08001066module_param(idescsi_nocd, int, 0600);
1067MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068module_init(init_idescsi_module);
1069module_exit(exit_idescsi_module);
1070MODULE_LICENSE("GPL");