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1da177e4 LT |
1 | /* |
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> | |
1da177e4 LT |
37 | #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> | |
df0ae249 | 48 | #include <linux/delay.h> |
e723ccd8 | 49 | #include <linux/mutex.h> |
1da177e4 LT |
50 | |
51 | #include <asm/io.h> | |
52 | #include <asm/bitops.h> | |
53 | #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 | ||
64 | typedef 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 */ | |
73 | 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 */ | |
85 | #define PC_TRANSFORM 2 /* transform SCSI commands */ | |
86 | #define PC_TIMEDOUT 3 /* command timed out */ | |
87 | #define PC_DMA_OK 4 /* Use DMA */ | |
88 | ||
89 | /* | |
90 | * SCSI command transformation layer | |
91 | */ | |
92 | #define IDESCSI_TRANSFORM 0 /* Enable/Disable transformation */ | |
93 | #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */ | |
94 | ||
95 | /* | |
96 | * Log flags | |
97 | */ | |
98 | #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */ | |
99 | ||
100 | typedef struct ide_scsi_obj { | |
101 | ide_drive_t *drive; | |
102 | ide_driver_t *driver; | |
103 | struct gendisk *disk; | |
104 | struct Scsi_Host *host; | |
105 | ||
106 | idescsi_pc_t *pc; /* Current packet command */ | |
107 | unsigned long flags; /* Status/Action flags */ | |
108 | unsigned long transform; /* SCSI cmd translation layer */ | |
109 | unsigned long log; /* log flags */ | |
110 | } idescsi_scsi_t; | |
111 | ||
e723ccd8 | 112 | static DEFINE_MUTEX(idescsi_ref_mutex); |
aaeab80b | 113 | static int idescsi_nocd; /* Set by module param to skip cd */ |
1da177e4 LT |
114 | |
115 | #define ide_scsi_g(disk) \ | |
116 | container_of((disk)->private_data, struct ide_scsi_obj, driver) | |
117 | ||
118 | static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk) | |
119 | { | |
120 | struct ide_scsi_obj *scsi = NULL; | |
121 | ||
e723ccd8 | 122 | mutex_lock(&idescsi_ref_mutex); |
1da177e4 LT |
123 | scsi = ide_scsi_g(disk); |
124 | if (scsi) | |
125 | scsi_host_get(scsi->host); | |
e723ccd8 | 126 | mutex_unlock(&idescsi_ref_mutex); |
1da177e4 LT |
127 | return scsi; |
128 | } | |
129 | ||
130 | static void ide_scsi_put(struct ide_scsi_obj *scsi) | |
131 | { | |
e723ccd8 | 132 | mutex_lock(&idescsi_ref_mutex); |
1da177e4 | 133 | scsi_host_put(scsi->host); |
e723ccd8 | 134 | mutex_unlock(&idescsi_ref_mutex); |
1da177e4 LT |
135 | } |
136 | ||
137 | static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host) | |
138 | { | |
139 | return (idescsi_scsi_t*) (&host[1]); | |
140 | } | |
141 | ||
142 | static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive) | |
143 | { | |
144 | return scsihost_to_idescsi(ide_drive->driver_data); | |
145 | } | |
146 | ||
147 | /* | |
148 | * Per ATAPI device status bits. | |
149 | */ | |
150 | #define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */ | |
151 | ||
152 | /* | |
153 | * ide-scsi requests. | |
154 | */ | |
155 | #define IDESCSI_PC_RQ 90 | |
156 | ||
157 | static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount) | |
158 | { | |
159 | while (bcount--) | |
160 | (void) HWIF(drive)->INB(IDE_DATA_REG); | |
161 | } | |
162 | ||
163 | static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount) | |
164 | { | |
165 | while (bcount--) | |
166 | HWIF(drive)->OUTB(0, IDE_DATA_REG); | |
167 | } | |
168 | ||
169 | /* | |
170 | * PIO data transfer routines using the scatter gather table. | |
171 | */ | |
172 | static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount) | |
173 | { | |
174 | int count; | |
175 | char *buf; | |
176 | ||
177 | while (bcount) { | |
178 | if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) { | |
179 | printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n"); | |
180 | idescsi_discard_data (drive, bcount); | |
181 | return; | |
182 | } | |
183 | count = min(pc->sg->length - pc->b_count, bcount); | |
a717f773 AM |
184 | if (PageHighMem(pc->sg->page)) { |
185 | unsigned long flags; | |
186 | ||
187 | local_irq_save(flags); | |
188 | buf = kmap_atomic(pc->sg->page, KM_IRQ0) + | |
189 | pc->sg->offset; | |
190 | drive->hwif->atapi_input_bytes(drive, | |
191 | buf + pc->b_count, count); | |
192 | kunmap_atomic(buf - pc->sg->offset, KM_IRQ0); | |
193 | local_irq_restore(flags); | |
194 | } else { | |
195 | buf = page_address(pc->sg->page) + pc->sg->offset; | |
196 | drive->hwif->atapi_input_bytes(drive, | |
197 | buf + pc->b_count, count); | |
198 | } | |
199 | bcount -= count; pc->b_count += count; | |
1da177e4 LT |
200 | if (pc->b_count == pc->sg->length) { |
201 | pc->sg++; | |
202 | pc->b_count = 0; | |
203 | } | |
204 | } | |
205 | } | |
206 | ||
207 | static 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) { | |
213 | if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) { | |
214 | printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n"); | |
215 | idescsi_output_zeros (drive, bcount); | |
216 | return; | |
217 | } | |
218 | count = min(pc->sg->length - pc->b_count, bcount); | |
a717f773 AM |
219 | if (PageHighMem(pc->sg->page)) { |
220 | unsigned long flags; | |
221 | ||
222 | local_irq_save(flags); | |
223 | buf = kmap_atomic(pc->sg->page, KM_IRQ0) + | |
224 | pc->sg->offset; | |
225 | drive->hwif->atapi_output_bytes(drive, | |
226 | buf + pc->b_count, count); | |
227 | kunmap_atomic(buf - pc->sg->offset, KM_IRQ0); | |
228 | local_irq_restore(flags); | |
229 | } else { | |
230 | buf = page_address(pc->sg->page) + pc->sg->offset; | |
231 | drive->hwif->atapi_output_bytes(drive, | |
232 | buf + pc->b_count, count); | |
233 | } | |
234 | bcount -= count; pc->b_count += count; | |
1da177e4 LT |
235 | if (pc->b_count == pc->sg->length) { |
236 | pc->sg++; | |
237 | pc->b_count = 0; | |
238 | } | |
239 | } | |
240 | } | |
241 | ||
242 | /* | |
243 | * Most of the SCSI commands are supported directly by ATAPI devices. | |
244 | * idescsi_transform_pc handles the few exceptions. | |
245 | */ | |
246 | static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc) | |
247 | { | |
248 | u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd; | |
249 | char *atapi_buf; | |
250 | ||
251 | if (!test_bit(PC_TRANSFORM, &pc->flags)) | |
252 | return; | |
253 | if (drive->media == ide_cdrom || drive->media == ide_optical) { | |
254 | if (c[0] == READ_6 || c[0] == WRITE_6) { | |
255 | c[8] = c[4]; c[5] = c[3]; c[4] = c[2]; | |
256 | c[3] = c[1] & 0x1f; c[2] = 0; c[1] &= 0xe0; | |
257 | c[0] += (READ_10 - READ_6); | |
258 | } | |
259 | if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) { | |
260 | unsigned short new_len; | |
261 | if (!scsi_buf) | |
262 | return; | |
263 | if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL) | |
264 | return; | |
265 | memset(atapi_buf, 0, pc->buffer_size + 4); | |
266 | memset (c, 0, 12); | |
267 | c[0] = sc[0] | 0x40; | |
268 | c[1] = sc[1]; | |
269 | c[2] = sc[2]; | |
270 | new_len = sc[4] + 4; | |
271 | c[8] = new_len; | |
272 | c[7] = new_len >> 8; | |
273 | c[9] = sc[5]; | |
274 | if (c[0] == MODE_SELECT_10) { | |
275 | atapi_buf[1] = scsi_buf[0]; /* Mode data length */ | |
276 | atapi_buf[2] = scsi_buf[1]; /* Medium type */ | |
277 | atapi_buf[3] = scsi_buf[2]; /* Device specific parameter */ | |
278 | atapi_buf[7] = scsi_buf[3]; /* Block descriptor length */ | |
279 | memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4); | |
280 | } | |
281 | pc->buffer = atapi_buf; | |
282 | pc->request_transfer += 4; | |
283 | pc->buffer_size += 4; | |
284 | } | |
285 | } | |
286 | } | |
287 | ||
288 | static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc) | |
289 | { | |
290 | u8 *atapi_buf = pc->buffer; | |
291 | u8 *sc = pc->scsi_cmd->cmnd; | |
292 | u8 *scsi_buf = pc->scsi_cmd->request_buffer; | |
293 | ||
294 | if (!test_bit(PC_TRANSFORM, &pc->flags)) | |
295 | return; | |
296 | if (drive->media == ide_cdrom || drive->media == ide_optical) { | |
297 | if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) { | |
298 | scsi_buf[0] = atapi_buf[1]; /* Mode data length */ | |
299 | scsi_buf[1] = atapi_buf[2]; /* Medium type */ | |
300 | scsi_buf[2] = atapi_buf[3]; /* Device specific parameter */ | |
301 | scsi_buf[3] = atapi_buf[7]; /* Block descriptor length */ | |
302 | memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8); | |
303 | } | |
304 | if (pc->c[0] == INQUIRY) { | |
305 | scsi_buf[2] |= 2; /* ansi_revision */ | |
306 | scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */ | |
307 | } | |
308 | } | |
309 | if (atapi_buf && atapi_buf != scsi_buf) | |
310 | kfree(atapi_buf); | |
311 | } | |
312 | ||
313 | static void hexdump(u8 *x, int len) | |
314 | { | |
315 | int i; | |
316 | ||
317 | printk("[ "); | |
318 | for (i = 0; i < len; i++) | |
319 | printk("%x ", x[i]); | |
320 | printk("]\n"); | |
321 | } | |
322 | ||
323 | static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command) | |
324 | { | |
325 | idescsi_scsi_t *scsi = drive_to_idescsi(drive); | |
326 | idescsi_pc_t *pc; | |
327 | struct request *rq; | |
328 | u8 *buf; | |
329 | ||
330 | /* stuff a sense request in front of our current request */ | |
331 | pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC); | |
332 | rq = kmalloc (sizeof (struct request), GFP_ATOMIC); | |
333 | buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC); | |
334 | if (pc == NULL || rq == NULL || buf == NULL) { | |
c9475cb0 JJ |
335 | kfree(buf); |
336 | kfree(rq); | |
337 | kfree(pc); | |
1da177e4 LT |
338 | return -ENOMEM; |
339 | } | |
340 | memset (pc, 0, sizeof (idescsi_pc_t)); | |
341 | memset (buf, 0, SCSI_SENSE_BUFFERSIZE); | |
342 | ide_init_drive_cmd(rq); | |
343 | rq->special = (char *) pc; | |
344 | pc->rq = rq; | |
345 | pc->buffer = buf; | |
346 | pc->c[0] = REQUEST_SENSE; | |
347 | pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE; | |
4aff5e23 | 348 | rq->cmd_type = REQ_TYPE_SENSE; |
1da177e4 LT |
349 | pc->timeout = jiffies + WAIT_READY; |
350 | /* NOTE! Save the failed packet command in "rq->buffer" */ | |
351 | rq->buffer = (void *) failed_command->special; | |
352 | pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd; | |
353 | if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) { | |
354 | printk ("ide-scsi: %s: queue cmd = ", drive->name); | |
355 | hexdump(pc->c, 6); | |
356 | } | |
357 | rq->rq_disk = scsi->disk; | |
358 | return ide_do_drive_cmd(drive, rq, ide_preempt); | |
359 | } | |
360 | ||
361 | static int idescsi_end_request(ide_drive_t *, int, int); | |
362 | ||
363 | static ide_startstop_t | |
364 | idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
365 | { | |
366 | if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT)) | |
367 | /* force an abort */ | |
368 | HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG); | |
369 | ||
370 | rq->errors++; | |
371 | ||
372 | idescsi_end_request(drive, 0, 0); | |
373 | ||
374 | return ide_stopped; | |
375 | } | |
376 | ||
377 | static ide_startstop_t | |
378 | idescsi_atapi_abort(ide_drive_t *drive, struct request *rq) | |
379 | { | |
380 | #if IDESCSI_DEBUG_LOG | |
381 | printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n", | |
382 | ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number); | |
383 | #endif | |
384 | rq->errors |= ERROR_MAX; | |
385 | ||
386 | idescsi_end_request(drive, 0, 0); | |
387 | ||
388 | return ide_stopped; | |
389 | } | |
390 | ||
391 | static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs) | |
392 | { | |
393 | idescsi_scsi_t *scsi = drive_to_idescsi(drive); | |
394 | struct request *rq = HWGROUP(drive)->rq; | |
395 | idescsi_pc_t *pc = (idescsi_pc_t *) rq->special; | |
396 | int log = test_bit(IDESCSI_LOG_CMD, &scsi->log); | |
397 | struct Scsi_Host *host; | |
398 | u8 *scsi_buf; | |
32565347 | 399 | int errors = rq->errors; |
1da177e4 LT |
400 | unsigned long flags; |
401 | ||
4aff5e23 | 402 | if (!blk_special_request(rq) && !blk_sense_request(rq)) { |
1da177e4 LT |
403 | ide_end_request(drive, uptodate, nrsecs); |
404 | return 0; | |
405 | } | |
406 | ide_end_drive_cmd (drive, 0, 0); | |
4aff5e23 | 407 | if (blk_sense_request(rq)) { |
1da177e4 LT |
408 | idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer; |
409 | if (log) { | |
410 | printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number); | |
411 | hexdump(pc->buffer,16); | |
412 | } | |
413 | memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE); | |
414 | kfree(pc->buffer); | |
415 | kfree(pc); | |
416 | kfree(rq); | |
417 | pc = opc; | |
418 | rq = pc->rq; | |
419 | pc->scsi_cmd->result = (CHECK_CONDITION << 1) | | |
420 | ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16); | |
421 | } else if (test_bit(PC_TIMEDOUT, &pc->flags)) { | |
422 | if (log) | |
423 | printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n", | |
424 | drive->name, pc->scsi_cmd->serial_number); | |
425 | pc->scsi_cmd->result = DID_TIME_OUT << 16; | |
32565347 | 426 | } else if (errors >= ERROR_MAX) { |
1da177e4 LT |
427 | pc->scsi_cmd->result = DID_ERROR << 16; |
428 | if (log) | |
429 | printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number); | |
32565347 | 430 | } else if (errors) { |
1da177e4 LT |
431 | if (log) |
432 | printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number); | |
433 | if (!idescsi_check_condition(drive, rq)) | |
434 | /* we started a request sense, so we'll be back, exit for now */ | |
435 | return 0; | |
436 | pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16); | |
437 | } else { | |
438 | pc->scsi_cmd->result = DID_OK << 16; | |
439 | idescsi_transform_pc2 (drive, pc); | |
440 | if (log) { | |
441 | printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number); | |
442 | if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) { | |
443 | printk(", rst = "); | |
444 | scsi_buf = pc->scsi_cmd->request_buffer; | |
445 | hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen)); | |
446 | } else printk("\n"); | |
447 | } | |
448 | } | |
449 | host = pc->scsi_cmd->device->host; | |
450 | spin_lock_irqsave(host->host_lock, flags); | |
451 | pc->done(pc->scsi_cmd); | |
452 | spin_unlock_irqrestore(host->host_lock, flags); | |
453 | kfree(pc); | |
454 | kfree(rq); | |
455 | scsi->pc = NULL; | |
456 | return 0; | |
457 | } | |
458 | ||
459 | static inline unsigned long get_timeout(idescsi_pc_t *pc) | |
460 | { | |
461 | return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies); | |
462 | } | |
463 | ||
464 | static int idescsi_expiry(ide_drive_t *drive) | |
465 | { | |
466 | idescsi_scsi_t *scsi = drive->driver_data; | |
467 | idescsi_pc_t *pc = scsi->pc; | |
468 | ||
469 | #if IDESCSI_DEBUG_LOG | |
470 | printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies); | |
471 | #endif | |
472 | set_bit(PC_TIMEDOUT, &pc->flags); | |
473 | ||
474 | return 0; /* we do not want the ide subsystem to retry */ | |
475 | } | |
476 | ||
477 | /* | |
478 | * Our interrupt handler. | |
479 | */ | |
480 | static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive) | |
481 | { | |
482 | idescsi_scsi_t *scsi = drive_to_idescsi(drive); | |
483 | idescsi_pc_t *pc=scsi->pc; | |
484 | struct request *rq = pc->rq; | |
485 | atapi_bcount_t bcount; | |
486 | atapi_status_t status; | |
487 | atapi_ireason_t ireason; | |
488 | atapi_feature_t feature; | |
489 | ||
490 | unsigned int temp; | |
491 | ||
492 | #if IDESCSI_DEBUG_LOG | |
493 | printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n"); | |
494 | #endif /* IDESCSI_DEBUG_LOG */ | |
495 | ||
496 | if (test_bit(PC_TIMEDOUT, &pc->flags)){ | |
497 | #if IDESCSI_DEBUG_LOG | |
498 | printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n", | |
499 | pc->scsi_cmd->serial_number, jiffies); | |
500 | #endif | |
501 | /* end this request now - scsi should retry it*/ | |
502 | idescsi_end_request (drive, 1, 0); | |
503 | return ide_stopped; | |
504 | } | |
505 | if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) { | |
506 | #if IDESCSI_DEBUG_LOG | |
507 | printk ("ide-scsi: %s: DMA complete\n", drive->name); | |
508 | #endif /* IDESCSI_DEBUG_LOG */ | |
509 | pc->actually_transferred=pc->request_transfer; | |
510 | (void) HWIF(drive)->ide_dma_end(drive); | |
511 | } | |
512 | ||
513 | feature.all = 0; | |
514 | /* Clear the interrupt */ | |
515 | status.all = HWIF(drive)->INB(IDE_STATUS_REG); | |
516 | ||
517 | if (!status.b.drq) { | |
518 | /* No more interrupts */ | |
519 | if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) | |
520 | printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred); | |
36e8e578 | 521 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
522 | if (status.b.check) |
523 | rq->errors++; | |
524 | idescsi_end_request (drive, 1, 0); | |
525 | return ide_stopped; | |
526 | } | |
527 | bcount.b.low = HWIF(drive)->INB(IDE_BCOUNTL_REG); | |
528 | bcount.b.high = HWIF(drive)->INB(IDE_BCOUNTH_REG); | |
529 | ireason.all = HWIF(drive)->INB(IDE_IREASON_REG); | |
530 | ||
531 | if (ireason.b.cod) { | |
532 | printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n"); | |
533 | return ide_do_reset (drive); | |
534 | } | |
535 | if (ireason.b.io) { | |
536 | temp = pc->actually_transferred + bcount.all; | |
537 | if (temp > pc->request_transfer) { | |
538 | if (temp > pc->buffer_size) { | |
539 | printk(KERN_ERR "ide-scsi: The scsi wants to " | |
540 | "send us more data than expected " | |
541 | "- discarding data\n"); | |
542 | temp = pc->buffer_size - pc->actually_transferred; | |
543 | if (temp) { | |
544 | clear_bit(PC_WRITING, &pc->flags); | |
545 | if (pc->sg) | |
546 | idescsi_input_buffers(drive, pc, temp); | |
547 | else | |
548 | drive->hwif->atapi_input_bytes(drive, pc->current_position, temp); | |
549 | printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all); | |
550 | } | |
551 | pc->actually_transferred += temp; | |
552 | pc->current_position += temp; | |
553 | idescsi_discard_data(drive, bcount.all - temp); | |
554 | ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry); | |
555 | return ide_started; | |
556 | } | |
557 | #if IDESCSI_DEBUG_LOG | |
558 | printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n"); | |
559 | #endif /* IDESCSI_DEBUG_LOG */ | |
560 | } | |
561 | } | |
562 | if (ireason.b.io) { | |
563 | clear_bit(PC_WRITING, &pc->flags); | |
564 | if (pc->sg) | |
565 | idescsi_input_buffers(drive, pc, bcount.all); | |
566 | else | |
567 | HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all); | |
568 | } else { | |
569 | set_bit(PC_WRITING, &pc->flags); | |
570 | if (pc->sg) | |
571 | idescsi_output_buffers (drive, pc, bcount.all); | |
572 | else | |
573 | HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all); | |
574 | } | |
575 | /* Update the current position */ | |
576 | pc->actually_transferred += bcount.all; | |
577 | pc->current_position += bcount.all; | |
578 | ||
579 | /* And set the interrupt handler again */ | |
580 | ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry); | |
581 | return ide_started; | |
582 | } | |
583 | ||
584 | static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive) | |
585 | { | |
586 | ide_hwif_t *hwif = drive->hwif; | |
587 | idescsi_scsi_t *scsi = drive_to_idescsi(drive); | |
588 | idescsi_pc_t *pc = scsi->pc; | |
589 | atapi_ireason_t ireason; | |
590 | ide_startstop_t startstop; | |
591 | ||
592 | if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { | |
593 | printk(KERN_ERR "ide-scsi: Strange, packet command " | |
594 | "initiated yet DRQ isn't asserted\n"); | |
595 | return startstop; | |
596 | } | |
597 | ireason.all = HWIF(drive)->INB(IDE_IREASON_REG); | |
598 | if (!ireason.b.cod || ireason.b.io) { | |
599 | printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while " | |
600 | "issuing a packet command\n"); | |
601 | return ide_do_reset (drive); | |
602 | } | |
125e1874 | 603 | BUG_ON(HWGROUP(drive)->handler != NULL); |
1da177e4 LT |
604 | /* Set the interrupt routine */ |
605 | ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry); | |
606 | /* Send the actual packet */ | |
607 | drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12); | |
608 | if (test_bit (PC_DMA_OK, &pc->flags)) { | |
609 | set_bit (PC_DMA_IN_PROGRESS, &pc->flags); | |
610 | hwif->dma_start(drive); | |
611 | } | |
612 | return ide_started; | |
613 | } | |
614 | ||
615 | static inline int idescsi_set_direction(idescsi_pc_t *pc) | |
616 | { | |
617 | switch (pc->c[0]) { | |
618 | case READ_6: case READ_10: case READ_12: | |
619 | clear_bit(PC_WRITING, &pc->flags); | |
620 | return 0; | |
621 | case WRITE_6: case WRITE_10: case WRITE_12: | |
622 | set_bit(PC_WRITING, &pc->flags); | |
623 | return 0; | |
624 | default: | |
625 | return 1; | |
626 | } | |
627 | } | |
628 | ||
629 | static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc) | |
630 | { | |
631 | ide_hwif_t *hwif = drive->hwif; | |
632 | struct scatterlist *sg, *scsi_sg; | |
633 | int segments; | |
634 | ||
635 | if (!pc->request_transfer || pc->request_transfer % 1024) | |
636 | return 1; | |
637 | ||
638 | if (idescsi_set_direction(pc)) | |
639 | return 1; | |
640 | ||
641 | sg = hwif->sg_table; | |
642 | scsi_sg = pc->scsi_cmd->request_buffer; | |
643 | segments = pc->scsi_cmd->use_sg; | |
644 | ||
645 | if (segments > hwif->sg_max_nents) | |
646 | return 1; | |
647 | ||
648 | if (!segments) { | |
649 | hwif->sg_nents = 1; | |
650 | sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer); | |
651 | } else { | |
652 | hwif->sg_nents = segments; | |
653 | memcpy(sg, scsi_sg, sizeof(*sg) * segments); | |
654 | } | |
655 | ||
656 | return 0; | |
657 | } | |
658 | ||
659 | /* | |
660 | * Issue a packet command | |
661 | */ | |
662 | static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc) | |
663 | { | |
664 | idescsi_scsi_t *scsi = drive_to_idescsi(drive); | |
665 | ide_hwif_t *hwif = drive->hwif; | |
666 | atapi_feature_t feature; | |
667 | atapi_bcount_t bcount; | |
668 | ||
669 | scsi->pc=pc; /* Set the current packet command */ | |
670 | pc->actually_transferred=0; /* We haven't transferred any data yet */ | |
671 | pc->current_position=pc->buffer; | |
672 | bcount.all = min(pc->request_transfer, 63 * 1024); /* Request to transfer the entire buffer at once */ | |
673 | ||
674 | feature.all = 0; | |
675 | if (drive->using_dma && !idescsi_map_sg(drive, pc)) { | |
676 | hwif->sg_mapped = 1; | |
677 | feature.b.dma = !hwif->dma_setup(drive); | |
678 | hwif->sg_mapped = 0; | |
679 | } | |
680 | ||
681 | SELECT_DRIVE(drive); | |
682 | if (IDE_CONTROL_REG) | |
683 | HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG); | |
684 | ||
685 | HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG); | |
686 | HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG); | |
687 | HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG); | |
688 | ||
689 | if (feature.b.dma) | |
690 | set_bit(PC_DMA_OK, &pc->flags); | |
691 | ||
692 | if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) { | |
125e1874 | 693 | BUG_ON(HWGROUP(drive)->handler != NULL); |
1da177e4 LT |
694 | ide_set_handler(drive, &idescsi_transfer_pc, |
695 | get_timeout(pc), idescsi_expiry); | |
696 | /* Issue the packet command */ | |
697 | HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); | |
698 | return ide_started; | |
699 | } else { | |
700 | /* Issue the packet command */ | |
701 | HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); | |
702 | return idescsi_transfer_pc(drive); | |
703 | } | |
704 | } | |
705 | ||
706 | /* | |
707 | * idescsi_do_request is our request handling function. | |
708 | */ | |
709 | static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block) | |
710 | { | |
711 | #if IDESCSI_DEBUG_LOG | |
cdd60262 | 712 | printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors); |
1da177e4 LT |
713 | printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors); |
714 | #endif /* IDESCSI_DEBUG_LOG */ | |
715 | ||
4aff5e23 | 716 | if (blk_sense_request(rq) || blk_special_request(rq)) { |
1da177e4 LT |
717 | return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special); |
718 | } | |
719 | blk_dump_rq_flags(rq, "ide-scsi: unsup command"); | |
720 | idescsi_end_request (drive, 0, 0); | |
721 | return ide_stopped; | |
722 | } | |
723 | ||
724 | static void idescsi_add_settings(ide_drive_t *drive) | |
725 | { | |
726 | idescsi_scsi_t *scsi = drive_to_idescsi(drive); | |
727 | ||
728 | /* | |
729 | * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function | |
730 | */ | |
731 | ide_add_setting(drive, "bios_cyl", SETTING_RW, -1, -1, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL); | |
732 | ide_add_setting(drive, "bios_head", SETTING_RW, -1, -1, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL); | |
733 | ide_add_setting(drive, "bios_sect", SETTING_RW, -1, -1, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL); | |
734 | ide_add_setting(drive, "transform", SETTING_RW, -1, -1, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL); | |
735 | ide_add_setting(drive, "log", SETTING_RW, -1, -1, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL); | |
736 | } | |
737 | ||
738 | /* | |
739 | * Driver initialization. | |
740 | */ | |
741 | static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi) | |
742 | { | |
1da177e4 LT |
743 | if (drive->id && (drive->id->config & 0x0060) == 0x20) |
744 | set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags); | |
745 | set_bit(IDESCSI_TRANSFORM, &scsi->transform); | |
746 | clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform); | |
747 | #if IDESCSI_DEBUG_LOG | |
748 | set_bit(IDESCSI_LOG_CMD, &scsi->log); | |
749 | #endif /* IDESCSI_DEBUG_LOG */ | |
750 | idescsi_add_settings(drive); | |
1da177e4 LT |
751 | } |
752 | ||
b62735d9 | 753 | static void ide_scsi_remove(ide_drive_t *drive) |
1da177e4 LT |
754 | { |
755 | struct Scsi_Host *scsihost = drive->driver_data; | |
756 | struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost); | |
757 | struct gendisk *g = scsi->disk; | |
758 | ||
8604affd | 759 | ide_unregister_subdriver(drive, scsi->driver); |
1da177e4 LT |
760 | |
761 | ide_unregister_region(g); | |
762 | ||
763 | drive->driver_data = NULL; | |
764 | g->private_data = NULL; | |
765 | put_disk(g); | |
766 | ||
767 | scsi_remove_host(scsihost); | |
768 | ide_scsi_put(scsi); | |
1da177e4 LT |
769 | } |
770 | ||
b62735d9 | 771 | static int ide_scsi_probe(ide_drive_t *); |
1da177e4 LT |
772 | |
773 | #ifdef CONFIG_PROC_FS | |
774 | static ide_proc_entry_t idescsi_proc[] = { | |
775 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
776 | { NULL, 0, NULL, NULL } | |
777 | }; | |
778 | #else | |
779 | # define idescsi_proc NULL | |
780 | #endif | |
781 | ||
1da177e4 | 782 | static ide_driver_t idescsi_driver = { |
8604affd | 783 | .gen_driver = { |
4ef3b8f4 | 784 | .owner = THIS_MODULE, |
8604affd BZ |
785 | .name = "ide-scsi", |
786 | .bus = &ide_bus_type, | |
8604affd | 787 | }, |
b62735d9 MP |
788 | .probe = ide_scsi_probe, |
789 | .remove = ide_scsi_remove, | |
1da177e4 LT |
790 | .version = IDESCSI_VERSION, |
791 | .media = ide_scsi, | |
1da177e4 LT |
792 | .supports_dsc_overlap = 0, |
793 | .proc = idescsi_proc, | |
1da177e4 LT |
794 | .do_request = idescsi_do_request, |
795 | .end_request = idescsi_end_request, | |
796 | .error = idescsi_atapi_error, | |
797 | .abort = idescsi_atapi_abort, | |
1da177e4 LT |
798 | }; |
799 | ||
800 | static int idescsi_ide_open(struct inode *inode, struct file *filp) | |
801 | { | |
802 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
803 | struct ide_scsi_obj *scsi; | |
804 | ide_drive_t *drive; | |
805 | ||
806 | if (!(scsi = ide_scsi_get(disk))) | |
807 | return -ENXIO; | |
808 | ||
809 | drive = scsi->drive; | |
810 | ||
811 | drive->usage++; | |
812 | ||
813 | return 0; | |
814 | } | |
815 | ||
816 | static int idescsi_ide_release(struct inode *inode, struct file *filp) | |
817 | { | |
818 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
819 | struct ide_scsi_obj *scsi = ide_scsi_g(disk); | |
820 | ide_drive_t *drive = scsi->drive; | |
821 | ||
822 | drive->usage--; | |
823 | ||
824 | ide_scsi_put(scsi); | |
825 | ||
826 | return 0; | |
827 | } | |
828 | ||
829 | static int idescsi_ide_ioctl(struct inode *inode, struct file *file, | |
830 | unsigned int cmd, unsigned long arg) | |
831 | { | |
832 | struct block_device *bdev = inode->i_bdev; | |
833 | struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk); | |
834 | return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg); | |
835 | } | |
836 | ||
837 | static struct block_device_operations idescsi_ops = { | |
838 | .owner = THIS_MODULE, | |
839 | .open = idescsi_ide_open, | |
840 | .release = idescsi_ide_release, | |
841 | .ioctl = idescsi_ide_ioctl, | |
842 | }; | |
843 | ||
1da177e4 LT |
844 | static int idescsi_slave_configure(struct scsi_device * sdp) |
845 | { | |
846 | /* Configure detected device */ | |
847 | scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun); | |
848 | return 0; | |
849 | } | |
850 | ||
851 | static const char *idescsi_info (struct Scsi_Host *host) | |
852 | { | |
853 | return "SCSI host adapter emulation for IDE ATAPI devices"; | |
854 | } | |
855 | ||
856 | static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg) | |
857 | { | |
858 | idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host); | |
859 | ||
860 | if (cmd == SG_SET_TRANSFORM) { | |
861 | if (arg) | |
862 | set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform); | |
863 | else | |
864 | clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform); | |
865 | return 0; | |
866 | } else if (cmd == SG_GET_TRANSFORM) | |
867 | return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg); | |
868 | return -EINVAL; | |
869 | } | |
870 | ||
871 | static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd) | |
872 | { | |
873 | idescsi_scsi_t *scsi = drive_to_idescsi(drive); | |
874 | ||
875 | /* this was a layering violation and we can't support it | |
876 | anymore, sorry. */ | |
877 | #if 0 | |
878 | struct gendisk *disk = cmd->request->rq_disk; | |
879 | ||
880 | if (disk) { | |
f64a181d | 881 | struct struct scsi_device_Template **p = disk->private_data; |
1da177e4 LT |
882 | if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0) |
883 | return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform); | |
884 | } | |
885 | #endif | |
886 | return test_bit(IDESCSI_TRANSFORM, &scsi->transform); | |
887 | } | |
888 | ||
889 | static int idescsi_queue (struct scsi_cmnd *cmd, | |
890 | void (*done)(struct scsi_cmnd *)) | |
891 | { | |
892 | struct Scsi_Host *host = cmd->device->host; | |
893 | idescsi_scsi_t *scsi = scsihost_to_idescsi(host); | |
894 | ide_drive_t *drive = scsi->drive; | |
895 | struct request *rq = NULL; | |
896 | idescsi_pc_t *pc = NULL; | |
897 | ||
898 | if (!drive) { | |
017560fc | 899 | scmd_printk (KERN_ERR, cmd, "drive not present\n"); |
1da177e4 LT |
900 | goto abort; |
901 | } | |
902 | scsi = drive_to_idescsi(drive); | |
903 | pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC); | |
904 | rq = kmalloc (sizeof (struct request), GFP_ATOMIC); | |
905 | if (rq == NULL || pc == NULL) { | |
906 | printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name); | |
907 | goto abort; | |
908 | } | |
909 | ||
910 | memset (pc->c, 0, 12); | |
911 | pc->flags = 0; | |
912 | pc->rq = rq; | |
913 | memcpy (pc->c, cmd->cmnd, cmd->cmd_len); | |
914 | if (cmd->use_sg) { | |
915 | pc->buffer = NULL; | |
916 | pc->sg = cmd->request_buffer; | |
917 | } else { | |
918 | pc->buffer = cmd->request_buffer; | |
919 | pc->sg = NULL; | |
920 | } | |
921 | pc->b_count = 0; | |
922 | pc->request_transfer = pc->buffer_size = cmd->request_bufflen; | |
923 | pc->scsi_cmd = cmd; | |
924 | pc->done = done; | |
925 | pc->timeout = jiffies + cmd->timeout_per_command; | |
926 | ||
927 | if (should_transform(drive, cmd)) | |
928 | set_bit(PC_TRANSFORM, &pc->flags); | |
929 | idescsi_transform_pc1 (drive, pc); | |
930 | ||
931 | if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) { | |
932 | printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number); | |
933 | hexdump(cmd->cmnd, cmd->cmd_len); | |
934 | if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) { | |
935 | printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number); | |
936 | hexdump(pc->c, 12); | |
937 | } | |
938 | } | |
939 | ||
940 | ide_init_drive_cmd (rq); | |
941 | rq->special = (char *) pc; | |
4aff5e23 | 942 | rq->cmd_type = REQ_TYPE_SPECIAL; |
1da177e4 LT |
943 | spin_unlock_irq(host->host_lock); |
944 | rq->rq_disk = scsi->disk; | |
945 | (void) ide_do_drive_cmd (drive, rq, ide_end); | |
946 | spin_lock_irq(host->host_lock); | |
947 | return 0; | |
948 | abort: | |
c9475cb0 JJ |
949 | kfree (pc); |
950 | kfree (rq); | |
1da177e4 LT |
951 | cmd->result = DID_ERROR << 16; |
952 | done(cmd); | |
953 | return 0; | |
954 | } | |
955 | ||
956 | static int idescsi_eh_abort (struct scsi_cmnd *cmd) | |
957 | { | |
958 | idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host); | |
959 | ide_drive_t *drive = scsi->drive; | |
960 | int busy; | |
961 | int ret = FAILED; | |
962 | ||
963 | /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */ | |
964 | ||
965 | if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) | |
966 | printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number); | |
967 | ||
968 | if (!drive) { | |
969 | printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n"); | |
970 | WARN_ON(1); | |
971 | goto no_drive; | |
972 | } | |
973 | ||
974 | /* First give it some more time, how much is "right" is hard to say :-( */ | |
975 | ||
976 | busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */ | |
977 | if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) | |
978 | printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":""); | |
979 | ||
980 | spin_lock_irq(&ide_lock); | |
981 | ||
982 | /* If there is no pc running we're done (our interrupt took care of it) */ | |
983 | if (!scsi->pc) { | |
984 | ret = SUCCESS; | |
985 | goto ide_unlock; | |
986 | } | |
987 | ||
988 | /* It's somewhere in flight. Does ide subsystem agree? */ | |
989 | if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy && | |
990 | elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) { | |
991 | /* | |
992 | * FIXME - not sure this condition can ever occur | |
993 | */ | |
994 | printk (KERN_ERR "ide-scsi: cmd aborted!\n"); | |
995 | ||
4aff5e23 | 996 | if (blk_sense_request(scsi->pc->rq)) |
1da177e4 LT |
997 | kfree(scsi->pc->buffer); |
998 | kfree(scsi->pc->rq); | |
999 | kfree(scsi->pc); | |
1000 | scsi->pc = NULL; | |
1001 | ||
1002 | ret = SUCCESS; | |
1003 | } | |
1004 | ||
1005 | ide_unlock: | |
1006 | spin_unlock_irq(&ide_lock); | |
1007 | no_drive: | |
1008 | if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) | |
1009 | printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed"); | |
1010 | ||
1011 | return ret; | |
1012 | } | |
1013 | ||
1014 | static int idescsi_eh_reset (struct scsi_cmnd *cmd) | |
1015 | { | |
1016 | struct request *req; | |
1017 | idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host); | |
1018 | ide_drive_t *drive = scsi->drive; | |
1019 | int ready = 0; | |
1020 | int ret = SUCCESS; | |
1021 | ||
1022 | /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */ | |
1023 | ||
1024 | if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) | |
1025 | printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number); | |
1026 | ||
1027 | if (!drive) { | |
1028 | printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n"); | |
1029 | WARN_ON(1); | |
1030 | return FAILED; | |
1031 | } | |
1032 | ||
df0ae249 JG |
1033 | spin_lock_irq(cmd->device->host->host_lock); |
1034 | spin_lock(&ide_lock); | |
1da177e4 LT |
1035 | |
1036 | if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) { | |
1037 | printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n"); | |
1038 | spin_unlock(&ide_lock); | |
df0ae249 | 1039 | spin_unlock_irq(cmd->device->host->host_lock); |
1da177e4 LT |
1040 | return FAILED; |
1041 | } | |
1042 | ||
1043 | /* kill current request */ | |
1044 | blkdev_dequeue_request(req); | |
8ffdc655 | 1045 | end_that_request_last(req, 0); |
4aff5e23 | 1046 | if (blk_sense_request(req)) |
1da177e4 LT |
1047 | kfree(scsi->pc->buffer); |
1048 | kfree(scsi->pc); | |
1049 | scsi->pc = NULL; | |
1050 | kfree(req); | |
1051 | ||
1052 | /* now nuke the drive queue */ | |
1053 | while ((req = elv_next_request(drive->queue))) { | |
1054 | blkdev_dequeue_request(req); | |
8ffdc655 | 1055 | end_that_request_last(req, 0); |
1da177e4 LT |
1056 | } |
1057 | ||
1058 | HWGROUP(drive)->rq = NULL; | |
1059 | HWGROUP(drive)->handler = NULL; | |
1060 | HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */ | |
df0ae249 | 1061 | spin_unlock(&ide_lock); |
1da177e4 LT |
1062 | |
1063 | ide_do_reset(drive); | |
1064 | ||
1065 | /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */ | |
1066 | ||
1067 | do { | |
1da177e4 | 1068 | spin_unlock_irq(cmd->device->host->host_lock); |
df0ae249 | 1069 | msleep(50); |
1da177e4 LT |
1070 | spin_lock_irq(cmd->device->host->host_lock); |
1071 | } while ( HWGROUP(drive)->handler ); | |
1072 | ||
1073 | ready = drive_is_ready(drive); | |
1074 | HWGROUP(drive)->busy--; | |
1075 | if (!ready) { | |
1076 | printk (KERN_ERR "ide-scsi: reset failed!\n"); | |
1077 | ret = FAILED; | |
1078 | } | |
1079 | ||
df0ae249 | 1080 | spin_unlock_irq(cmd->device->host->host_lock); |
1da177e4 LT |
1081 | return ret; |
1082 | } | |
1083 | ||
1084 | static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev, | |
1085 | sector_t capacity, int *parm) | |
1086 | { | |
1087 | idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host); | |
1088 | ide_drive_t *drive = idescsi->drive; | |
1089 | ||
1090 | if (drive->bios_cyl && drive->bios_head && drive->bios_sect) { | |
1091 | parm[0] = drive->bios_head; | |
1092 | parm[1] = drive->bios_sect; | |
1093 | parm[2] = drive->bios_cyl; | |
1094 | } | |
1095 | return 0; | |
1096 | } | |
1097 | ||
1098 | static struct scsi_host_template idescsi_template = { | |
1099 | .module = THIS_MODULE, | |
1100 | .name = "idescsi", | |
1101 | .info = idescsi_info, | |
1102 | .slave_configure = idescsi_slave_configure, | |
1103 | .ioctl = idescsi_ioctl, | |
1104 | .queuecommand = idescsi_queue, | |
1105 | .eh_abort_handler = idescsi_eh_abort, | |
1106 | .eh_host_reset_handler = idescsi_eh_reset, | |
1107 | .bios_param = idescsi_bios, | |
1108 | .can_queue = 40, | |
1109 | .this_id = -1, | |
1110 | .sg_tablesize = 256, | |
1111 | .cmd_per_lun = 5, | |
1112 | .max_sectors = 128, | |
1113 | .use_clustering = DISABLE_CLUSTERING, | |
1114 | .emulated = 1, | |
1115 | .proc_name = "ide-scsi", | |
1116 | }; | |
1117 | ||
b62735d9 | 1118 | static int ide_scsi_probe(ide_drive_t *drive) |
1da177e4 LT |
1119 | { |
1120 | idescsi_scsi_t *idescsi; | |
1121 | struct Scsi_Host *host; | |
1122 | struct gendisk *g; | |
1123 | static int warned; | |
1124 | int err = -ENOMEM; | |
1125 | ||
1126 | if (!warned && drive->media == ide_cdrom) { | |
1127 | printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n"); | |
1128 | warned = 1; | |
1129 | } | |
1130 | ||
aaeab80b AC |
1131 | if (idescsi_nocd && drive->media == ide_cdrom) |
1132 | return -ENODEV; | |
1133 | ||
1da177e4 LT |
1134 | if (!strstr("ide-scsi", drive->driver_req) || |
1135 | !drive->present || | |
1136 | drive->media == ide_disk || | |
1137 | !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t)))) | |
8604affd | 1138 | return -ENODEV; |
1da177e4 LT |
1139 | |
1140 | g = alloc_disk(1 << PARTN_BITS); | |
1141 | if (!g) | |
1142 | goto out_host_put; | |
1143 | ||
1144 | ide_init_disk(g, drive); | |
1145 | ||
1146 | host->max_id = 1; | |
1147 | ||
1148 | #if IDESCSI_DEBUG_LOG | |
1149 | if (drive->id->last_lun) | |
1150 | printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun); | |
1151 | #endif | |
1152 | if ((drive->id->last_lun & 0x7) != 7) | |
1153 | host->max_lun = (drive->id->last_lun & 0x7) + 1; | |
1154 | else | |
1155 | host->max_lun = 1; | |
1156 | ||
1157 | drive->driver_data = host; | |
1158 | idescsi = scsihost_to_idescsi(host); | |
1159 | idescsi->drive = drive; | |
1160 | idescsi->driver = &idescsi_driver; | |
1161 | idescsi->host = host; | |
1162 | idescsi->disk = g; | |
1163 | g->private_data = &idescsi->driver; | |
8604affd BZ |
1164 | ide_register_subdriver(drive, &idescsi_driver); |
1165 | err = 0; | |
1166 | idescsi_setup(drive, idescsi); | |
1167 | g->fops = &idescsi_ops; | |
1168 | ide_register_region(g); | |
1169 | err = scsi_add_host(host, &drive->gendev); | |
1da177e4 | 1170 | if (!err) { |
8604affd BZ |
1171 | scsi_scan_host(host); |
1172 | return 0; | |
1da177e4 | 1173 | } |
8604affd BZ |
1174 | /* fall through on error */ |
1175 | ide_unregister_region(g); | |
1176 | ide_unregister_subdriver(drive, &idescsi_driver); | |
1da177e4 LT |
1177 | |
1178 | put_disk(g); | |
1179 | out_host_put: | |
1180 | scsi_host_put(host); | |
1181 | return err; | |
1182 | } | |
1183 | ||
1184 | static int __init init_idescsi_module(void) | |
1185 | { | |
8604affd | 1186 | return driver_register(&idescsi_driver.gen_driver); |
1da177e4 LT |
1187 | } |
1188 | ||
1189 | static void __exit exit_idescsi_module(void) | |
1190 | { | |
8604affd | 1191 | driver_unregister(&idescsi_driver.gen_driver); |
1da177e4 LT |
1192 | } |
1193 | ||
aaeab80b AC |
1194 | module_param(idescsi_nocd, int, 0600); |
1195 | MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd"); | |
1da177e4 LT |
1196 | module_init(init_idescsi_module); |
1197 | module_exit(exit_idescsi_module); | |
1198 | MODULE_LICENSE("GPL"); |