Commit | Line | Data |
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bef4a34a | 1 | /* |
bef4a34a HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
972621c9 | 20 | * K. Y. Srinivasan <kys@microsoft.com> |
bef4a34a | 21 | */ |
a1be1706 S |
22 | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/sched.h> | |
25 | #include <linux/completion.h> | |
26 | #include <linux/string.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/delay.h> | |
bef4a34a | 29 | #include <linux/init.h> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
bef4a34a HJ |
31 | #include <linux/module.h> |
32 | #include <linux/device.h> | |
bef4a34a HJ |
33 | #include <scsi/scsi.h> |
34 | #include <scsi/scsi_cmnd.h> | |
35 | #include <scsi/scsi_host.h> | |
36 | #include <scsi/scsi_device.h> | |
37 | #include <scsi/scsi_tcq.h> | |
38 | #include <scsi/scsi_eh.h> | |
39 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 40 | #include <scsi/scsi_dbg.h> |
3f335ea2 S |
41 | |
42 | #include "hyperv.h" | |
cdee1504 | 43 | #include "hyperv_storage.h" |
bef4a34a | 44 | |
8dcf37d4 | 45 | |
a1be1706 | 46 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; |
8dcf37d4 | 47 | |
a1be1706 S |
48 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
49 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
8dcf37d4 | 50 | |
a1be1706 S |
51 | struct hv_host_device { |
52 | struct hv_device *dev; | |
53 | struct kmem_cache *request_pool; | |
54 | unsigned int port; | |
55 | unsigned char path; | |
56 | unsigned char target; | |
57 | }; | |
58 | ||
59 | struct storvsc_cmd_request { | |
60 | struct list_head entry; | |
61 | struct scsi_cmnd *cmd; | |
62 | ||
63 | unsigned int bounce_sgl_count; | |
64 | struct scatterlist *bounce_sgl; | |
65 | ||
66 | struct hv_storvsc_request request; | |
67 | }; | |
8dcf37d4 S |
68 | |
69 | static inline struct storvsc_device *alloc_stor_device(struct hv_device *device) | |
70 | { | |
71 | struct storvsc_device *stor_device; | |
72 | ||
73 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); | |
74 | if (!stor_device) | |
75 | return NULL; | |
76 | ||
77 | stor_device->destroy = false; | |
78 | init_waitqueue_head(&stor_device->waiting_to_drain); | |
79 | stor_device->device = device; | |
80 | device->ext = stor_device; | |
81 | ||
82 | return stor_device; | |
83 | } | |
84 | ||
85 | ||
86 | static inline struct storvsc_device *get_in_stor_device( | |
87 | struct hv_device *device) | |
88 | { | |
89 | struct storvsc_device *stor_device; | |
90 | unsigned long flags; | |
91 | ||
92 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
93 | stor_device = (struct storvsc_device *)device->ext; | |
94 | ||
95 | if (!stor_device) | |
96 | goto get_in_err; | |
97 | ||
98 | /* | |
99 | * If the device is being destroyed; allow incoming | |
100 | * traffic only to cleanup outstanding requests. | |
101 | */ | |
102 | ||
103 | if (stor_device->destroy && | |
104 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
105 | stor_device = NULL; | |
106 | ||
107 | get_in_err: | |
108 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
109 | return stor_device; | |
110 | ||
111 | } | |
112 | ||
113 | static int storvsc_channel_init(struct hv_device *device) | |
114 | { | |
115 | struct storvsc_device *stor_device; | |
116 | struct hv_storvsc_request *request; | |
117 | struct vstor_packet *vstor_packet; | |
118 | int ret, t; | |
119 | ||
120 | stor_device = get_out_stor_device(device); | |
121 | if (!stor_device) | |
122 | return -ENODEV; | |
123 | ||
124 | request = &stor_device->init_request; | |
125 | vstor_packet = &request->vstor_packet; | |
126 | ||
127 | /* | |
128 | * Now, initiate the vsc/vsp initialization protocol on the open | |
129 | * channel | |
130 | */ | |
131 | memset(request, 0, sizeof(struct hv_storvsc_request)); | |
132 | init_completion(&request->wait_event); | |
133 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
134 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
135 | ||
136 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
137 | sizeof(struct vstor_packet), | |
138 | (unsigned long)request, | |
139 | VM_PKT_DATA_INBAND, | |
140 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
141 | if (ret != 0) | |
142 | goto cleanup; | |
143 | ||
144 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
145 | if (t == 0) { | |
146 | ret = -ETIMEDOUT; | |
147 | goto cleanup; | |
148 | } | |
149 | ||
150 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
151 | vstor_packet->status != 0) | |
152 | goto cleanup; | |
153 | ||
154 | ||
155 | /* reuse the packet for version range supported */ | |
156 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
157 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
158 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
159 | ||
160 | vstor_packet->version.major_minor = VMSTOR_PROTOCOL_VERSION_CURRENT; | |
161 | FILL_VMSTOR_REVISION(vstor_packet->version.revision); | |
162 | ||
163 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
164 | sizeof(struct vstor_packet), | |
165 | (unsigned long)request, | |
166 | VM_PKT_DATA_INBAND, | |
167 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
168 | if (ret != 0) | |
169 | goto cleanup; | |
170 | ||
171 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
172 | if (t == 0) { | |
173 | ret = -ETIMEDOUT; | |
174 | goto cleanup; | |
175 | } | |
176 | ||
177 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
178 | vstor_packet->status != 0) | |
179 | goto cleanup; | |
180 | ||
181 | ||
182 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
183 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
184 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
185 | vstor_packet->storage_channel_properties.port_number = | |
186 | stor_device->port_number; | |
187 | ||
188 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
189 | sizeof(struct vstor_packet), | |
190 | (unsigned long)request, | |
191 | VM_PKT_DATA_INBAND, | |
192 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
193 | ||
194 | if (ret != 0) | |
195 | goto cleanup; | |
196 | ||
197 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
198 | if (t == 0) { | |
199 | ret = -ETIMEDOUT; | |
200 | goto cleanup; | |
201 | } | |
202 | ||
203 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
204 | vstor_packet->status != 0) | |
205 | goto cleanup; | |
206 | ||
207 | stor_device->path_id = vstor_packet->storage_channel_properties.path_id; | |
208 | stor_device->target_id | |
209 | = vstor_packet->storage_channel_properties.target_id; | |
210 | ||
211 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
212 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
213 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
214 | ||
215 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
216 | sizeof(struct vstor_packet), | |
217 | (unsigned long)request, | |
218 | VM_PKT_DATA_INBAND, | |
219 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
220 | ||
221 | if (ret != 0) | |
222 | goto cleanup; | |
223 | ||
224 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
225 | if (t == 0) { | |
226 | ret = -ETIMEDOUT; | |
227 | goto cleanup; | |
228 | } | |
229 | ||
230 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
231 | vstor_packet->status != 0) | |
232 | goto cleanup; | |
233 | ||
234 | ||
235 | cleanup: | |
236 | return ret; | |
237 | } | |
238 | ||
239 | static void storvsc_on_io_completion(struct hv_device *device, | |
240 | struct vstor_packet *vstor_packet, | |
241 | struct hv_storvsc_request *request) | |
242 | { | |
243 | struct storvsc_device *stor_device; | |
244 | struct vstor_packet *stor_pkt; | |
245 | ||
246 | stor_device = (struct storvsc_device *)device->ext; | |
247 | ||
248 | stor_pkt = &request->vstor_packet; | |
249 | ||
250 | ||
251 | /* Copy over the status...etc */ | |
252 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
253 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
254 | stor_pkt->vm_srb.sense_info_length = | |
255 | vstor_packet->vm_srb.sense_info_length; | |
256 | ||
257 | if (vstor_packet->vm_srb.scsi_status != 0 || | |
258 | vstor_packet->vm_srb.srb_status != 1){ | |
259 | DPRINT_WARN(STORVSC, | |
260 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
261 | stor_pkt->vm_srb.cdb[0], | |
262 | vstor_packet->vm_srb.scsi_status, | |
263 | vstor_packet->vm_srb.srb_status); | |
264 | } | |
265 | ||
266 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
267 | /* CHECK_CONDITION */ | |
268 | if (vstor_packet->vm_srb.srb_status & 0x80) { | |
269 | /* autosense data available */ | |
270 | DPRINT_WARN(STORVSC, "storvsc pkt %p autosense data " | |
271 | "valid - len %d\n", request, | |
272 | vstor_packet->vm_srb.sense_info_length); | |
273 | ||
274 | memcpy(request->sense_buffer, | |
275 | vstor_packet->vm_srb.sense_data, | |
276 | vstor_packet->vm_srb.sense_info_length); | |
277 | ||
278 | } | |
279 | } | |
280 | ||
281 | stor_pkt->vm_srb.data_transfer_length = | |
282 | vstor_packet->vm_srb.data_transfer_length; | |
283 | ||
284 | request->on_io_completion(request); | |
285 | ||
286 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
287 | stor_device->drain_notify) | |
288 | wake_up(&stor_device->waiting_to_drain); | |
289 | ||
290 | ||
291 | } | |
292 | ||
293 | static void storvsc_on_receive(struct hv_device *device, | |
294 | struct vstor_packet *vstor_packet, | |
295 | struct hv_storvsc_request *request) | |
296 | { | |
297 | switch (vstor_packet->operation) { | |
298 | case VSTOR_OPERATION_COMPLETE_IO: | |
299 | storvsc_on_io_completion(device, vstor_packet, request); | |
300 | break; | |
301 | case VSTOR_OPERATION_REMOVE_DEVICE: | |
302 | ||
303 | default: | |
304 | break; | |
305 | } | |
306 | } | |
307 | ||
308 | static void storvsc_on_channel_callback(void *context) | |
309 | { | |
310 | struct hv_device *device = (struct hv_device *)context; | |
311 | struct storvsc_device *stor_device; | |
312 | u32 bytes_recvd; | |
313 | u64 request_id; | |
314 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
315 | struct hv_storvsc_request *request; | |
316 | int ret; | |
317 | ||
318 | ||
319 | stor_device = get_in_stor_device(device); | |
320 | if (!stor_device) | |
321 | return; | |
322 | ||
323 | do { | |
324 | ret = vmbus_recvpacket(device->channel, packet, | |
325 | ALIGN(sizeof(struct vstor_packet), 8), | |
326 | &bytes_recvd, &request_id); | |
327 | if (ret == 0 && bytes_recvd > 0) { | |
328 | ||
329 | request = (struct hv_storvsc_request *) | |
330 | (unsigned long)request_id; | |
331 | ||
332 | if ((request == &stor_device->init_request) || | |
333 | (request == &stor_device->reset_request)) { | |
334 | ||
335 | memcpy(&request->vstor_packet, packet, | |
336 | sizeof(struct vstor_packet)); | |
337 | complete(&request->wait_event); | |
338 | } else { | |
339 | storvsc_on_receive(device, | |
340 | (struct vstor_packet *)packet, | |
341 | request); | |
342 | } | |
343 | } else { | |
344 | break; | |
345 | } | |
346 | } while (1); | |
347 | ||
348 | return; | |
349 | } | |
350 | ||
351 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
352 | { | |
353 | struct vmstorage_channel_properties props; | |
354 | int ret; | |
355 | ||
356 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
357 | ||
358 | /* Open the channel */ | |
359 | ret = vmbus_open(device->channel, | |
360 | ring_size, | |
361 | ring_size, | |
362 | (void *)&props, | |
363 | sizeof(struct vmstorage_channel_properties), | |
364 | storvsc_on_channel_callback, device); | |
365 | ||
366 | if (ret != 0) | |
367 | return ret; | |
368 | ||
369 | ret = storvsc_channel_init(device); | |
370 | ||
371 | return ret; | |
372 | } | |
373 | ||
374 | int storvsc_dev_add(struct hv_device *device, | |
375 | void *additional_info) | |
376 | { | |
377 | struct storvsc_device *stor_device; | |
378 | struct storvsc_device_info *device_info; | |
379 | int ret = 0; | |
380 | ||
381 | device_info = (struct storvsc_device_info *)additional_info; | |
382 | stor_device = alloc_stor_device(device); | |
383 | if (!stor_device) | |
384 | return -ENOMEM; | |
385 | ||
386 | /* Save the channel properties to our storvsc channel */ | |
387 | ||
388 | /* | |
389 | * If we support more than 1 scsi channel, we need to set the | |
390 | * port number here to the scsi channel but how do we get the | |
391 | * scsi channel prior to the bus scan. | |
392 | * | |
393 | * The host does not support this. | |
394 | */ | |
395 | ||
396 | stor_device->port_number = device_info->port_number; | |
397 | /* Send it back up */ | |
398 | ret = storvsc_connect_to_vsp(device, device_info->ring_buffer_size); | |
399 | if (ret) { | |
400 | kfree(stor_device); | |
401 | return ret; | |
402 | } | |
403 | device_info->path_id = stor_device->path_id; | |
404 | device_info->target_id = stor_device->target_id; | |
405 | ||
406 | return ret; | |
407 | } | |
408 | ||
409 | int storvsc_dev_remove(struct hv_device *device) | |
410 | { | |
411 | struct storvsc_device *stor_device; | |
412 | unsigned long flags; | |
413 | ||
414 | stor_device = (struct storvsc_device *)device->ext; | |
415 | ||
416 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
417 | stor_device->destroy = true; | |
418 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
419 | ||
420 | /* | |
421 | * At this point, all outbound traffic should be disable. We | |
422 | * only allow inbound traffic (responses) to proceed so that | |
423 | * outstanding requests can be completed. | |
424 | */ | |
425 | ||
426 | storvsc_wait_to_drain(stor_device); | |
427 | ||
428 | /* | |
429 | * Since we have already drained, we don't need to busy wait | |
430 | * as was done in final_release_stor_device() | |
431 | * Note that we cannot set the ext pointer to NULL until | |
432 | * we have drained - to drain the outgoing packets, we need to | |
433 | * allow incoming packets. | |
434 | */ | |
435 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
436 | device->ext = NULL; | |
437 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
438 | ||
439 | /* Close the channel */ | |
440 | vmbus_close(device->channel); | |
441 | ||
442 | kfree(stor_device); | |
443 | return 0; | |
444 | } | |
445 | ||
446 | int storvsc_do_io(struct hv_device *device, | |
447 | struct hv_storvsc_request *request) | |
448 | { | |
449 | struct storvsc_device *stor_device; | |
450 | struct vstor_packet *vstor_packet; | |
451 | int ret = 0; | |
452 | ||
453 | vstor_packet = &request->vstor_packet; | |
454 | stor_device = get_out_stor_device(device); | |
455 | ||
456 | if (!stor_device) | |
457 | return -ENODEV; | |
458 | ||
459 | ||
460 | request->device = device; | |
461 | ||
462 | ||
463 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
464 | ||
465 | vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); | |
466 | ||
467 | ||
468 | vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE; | |
469 | ||
470 | ||
471 | vstor_packet->vm_srb.data_transfer_length = | |
472 | request->data_buffer.len; | |
473 | ||
474 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
475 | ||
476 | if (request->data_buffer.len) { | |
477 | ret = vmbus_sendpacket_multipagebuffer(device->channel, | |
478 | &request->data_buffer, | |
479 | vstor_packet, | |
480 | sizeof(struct vstor_packet), | |
481 | (unsigned long)request); | |
482 | } else { | |
483 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
484 | sizeof(struct vstor_packet), | |
485 | (unsigned long)request, | |
486 | VM_PKT_DATA_INBAND, | |
487 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
488 | } | |
489 | ||
490 | if (ret != 0) | |
491 | return ret; | |
492 | ||
493 | atomic_inc(&stor_device->num_outstanding_req); | |
494 | ||
495 | return ret; | |
496 | } | |
497 | ||
bd1f5d6a S |
498 | static void storvsc_get_ide_info(struct hv_device *dev, int *target, int *path) |
499 | { | |
500 | *target = | |
501 | dev->dev_instance.b[5] << 8 | dev->dev_instance.b[4]; | |
502 | ||
503 | *path = | |
504 | dev->dev_instance.b[3] << 24 | | |
505 | dev->dev_instance.b[2] << 16 | | |
506 | dev->dev_instance.b[1] << 8 | dev->dev_instance.b[0]; | |
507 | } | |
508 | ||
bef4a34a | 509 | |
5b60acee S |
510 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
511 | { | |
512 | /* | |
513 | * This enables luns to be located sparsely. Otherwise, we may not | |
514 | * discovered them. | |
515 | */ | |
516 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; | |
517 | return 0; | |
518 | } | |
519 | ||
a1ebfeae S |
520 | static int storvsc_merge_bvec(struct request_queue *q, |
521 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
522 | { | |
523 | /* checking done by caller. */ | |
524 | return bvec->bv_len; | |
525 | } | |
526 | ||
419f2d03 S |
527 | static int storvsc_device_configure(struct scsi_device *sdevice) |
528 | { | |
529 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
530 | STORVSC_MAX_IO_REQUESTS); | |
531 | ||
419f2d03 S |
532 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
533 | ||
419f2d03 S |
534 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
535 | ||
536 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
419f2d03 S |
537 | |
538 | return 0; | |
539 | } | |
540 | ||
49a3c7a9 S |
541 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
542 | unsigned int sg_count) | |
543 | { | |
544 | int i; | |
545 | struct page *page_buf; | |
546 | ||
547 | for (i = 0; i < sg_count; i++) { | |
548 | page_buf = sg_page((&sgl[i])); | |
549 | if (page_buf != NULL) | |
550 | __free_page(page_buf); | |
551 | } | |
552 | ||
553 | kfree(sgl); | |
554 | } | |
555 | ||
3862ef3e S |
556 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
557 | { | |
558 | int i; | |
559 | ||
560 | /* No need to check */ | |
561 | if (sg_count < 2) | |
562 | return -1; | |
563 | ||
564 | /* We have at least 2 sg entries */ | |
565 | for (i = 0; i < sg_count; i++) { | |
566 | if (i == 0) { | |
567 | /* make sure 1st one does not have hole */ | |
568 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
569 | return i; | |
570 | } else if (i == sg_count - 1) { | |
571 | /* make sure last one does not have hole */ | |
572 | if (sgl[i].offset != 0) | |
573 | return i; | |
574 | } else { | |
575 | /* make sure no hole in the middle */ | |
576 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
577 | return i; | |
578 | } | |
579 | } | |
580 | return -1; | |
581 | } | |
582 | ||
a9753cbd S |
583 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
584 | unsigned int sg_count, | |
585 | unsigned int len) | |
586 | { | |
587 | int i; | |
588 | int num_pages; | |
589 | struct scatterlist *bounce_sgl; | |
590 | struct page *page_buf; | |
591 | ||
592 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
593 | ||
594 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
595 | if (!bounce_sgl) | |
596 | return NULL; | |
597 | ||
598 | for (i = 0; i < num_pages; i++) { | |
599 | page_buf = alloc_page(GFP_ATOMIC); | |
600 | if (!page_buf) | |
601 | goto cleanup; | |
602 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); | |
603 | } | |
604 | ||
605 | return bounce_sgl; | |
606 | ||
607 | cleanup: | |
608 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
609 | return NULL; | |
610 | } | |
611 | ||
29fe2c9b S |
612 | |
613 | /* Assume the original sgl has enough room */ | |
614 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
615 | struct scatterlist *bounce_sgl, | |
616 | unsigned int orig_sgl_count) | |
617 | { | |
618 | int i; | |
619 | int j = 0; | |
620 | unsigned long src, dest; | |
621 | unsigned int srclen, destlen, copylen; | |
622 | unsigned int total_copied = 0; | |
623 | unsigned long bounce_addr = 0; | |
624 | unsigned long dest_addr = 0; | |
625 | unsigned long flags; | |
626 | ||
627 | local_irq_save(flags); | |
628 | ||
629 | for (i = 0; i < orig_sgl_count; i++) { | |
630 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
631 | KM_IRQ0) + orig_sgl[i].offset; | |
632 | dest = dest_addr; | |
633 | destlen = orig_sgl[i].length; | |
634 | ||
635 | if (bounce_addr == 0) | |
636 | bounce_addr = | |
637 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
638 | KM_IRQ0); | |
639 | ||
640 | while (destlen) { | |
641 | src = bounce_addr + bounce_sgl[j].offset; | |
642 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
643 | ||
644 | copylen = min(srclen, destlen); | |
645 | memcpy((void *)dest, (void *)src, copylen); | |
646 | ||
647 | total_copied += copylen; | |
648 | bounce_sgl[j].offset += copylen; | |
649 | destlen -= copylen; | |
650 | dest += copylen; | |
651 | ||
652 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
653 | /* full */ | |
654 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
655 | j++; | |
656 | ||
657 | /* if we need to use another bounce buffer */ | |
658 | if (destlen || i != orig_sgl_count - 1) | |
659 | bounce_addr = | |
660 | (unsigned long)kmap_atomic( | |
661 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
662 | } else if (destlen == 0 && i == orig_sgl_count - 1) { | |
663 | /* unmap the last bounce that is < PAGE_SIZE */ | |
664 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
665 | } | |
666 | } | |
667 | ||
668 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), | |
669 | KM_IRQ0); | |
670 | } | |
671 | ||
672 | local_irq_restore(flags); | |
673 | ||
674 | return total_copied; | |
675 | } | |
676 | ||
6a8ff44b S |
677 | |
678 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
679 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
680 | struct scatterlist *bounce_sgl, | |
681 | unsigned int orig_sgl_count) | |
682 | { | |
683 | int i; | |
684 | int j = 0; | |
685 | unsigned long src, dest; | |
686 | unsigned int srclen, destlen, copylen; | |
687 | unsigned int total_copied = 0; | |
688 | unsigned long bounce_addr = 0; | |
689 | unsigned long src_addr = 0; | |
690 | unsigned long flags; | |
691 | ||
692 | local_irq_save(flags); | |
693 | ||
694 | for (i = 0; i < orig_sgl_count; i++) { | |
695 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
696 | KM_IRQ0) + orig_sgl[i].offset; | |
697 | src = src_addr; | |
698 | srclen = orig_sgl[i].length; | |
699 | ||
700 | if (bounce_addr == 0) | |
701 | bounce_addr = | |
702 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
703 | KM_IRQ0); | |
704 | ||
705 | while (srclen) { | |
706 | /* assume bounce offset always == 0 */ | |
707 | dest = bounce_addr + bounce_sgl[j].length; | |
708 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
709 | ||
710 | copylen = min(srclen, destlen); | |
711 | memcpy((void *)dest, (void *)src, copylen); | |
712 | ||
713 | total_copied += copylen; | |
714 | bounce_sgl[j].length += copylen; | |
715 | srclen -= copylen; | |
716 | src += copylen; | |
717 | ||
718 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
719 | /* full..move to next entry */ | |
720 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
721 | j++; | |
722 | ||
723 | /* if we need to use another bounce buffer */ | |
724 | if (srclen || i != orig_sgl_count - 1) | |
725 | bounce_addr = | |
726 | (unsigned long)kmap_atomic( | |
727 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
728 | ||
729 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
730 | /* unmap the last bounce that is < PAGE_SIZE */ | |
731 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
732 | } | |
733 | } | |
734 | ||
735 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
736 | } | |
737 | ||
738 | local_irq_restore(flags); | |
739 | ||
740 | return total_copied; | |
741 | } | |
742 | ||
5c5c0234 | 743 | |
5c5c0234 S |
744 | static int storvsc_remove(struct hv_device *dev) |
745 | { | |
5c5c0234 S |
746 | struct Scsi_Host *host = dev_get_drvdata(&dev->device); |
747 | struct hv_host_device *host_dev = | |
748 | (struct hv_host_device *)host->hostdata; | |
749 | ||
2935a407 S |
750 | scsi_remove_host(host); |
751 | ||
2935a407 | 752 | scsi_host_put(host); |
d36b0a03 | 753 | |
6cdc57c0 | 754 | storvsc_dev_remove(dev); |
5c5c0234 S |
755 | if (host_dev->request_pool) { |
756 | kmem_cache_destroy(host_dev->request_pool); | |
757 | host_dev->request_pool = NULL; | |
758 | } | |
5c5c0234 S |
759 | return 0; |
760 | } | |
761 | ||
62838ce2 S |
762 | |
763 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, | |
764 | sector_t capacity, int *info) | |
765 | { | |
5326fd5c S |
766 | sector_t nsect = capacity; |
767 | sector_t cylinders = nsect; | |
768 | int heads, sectors_pt; | |
62838ce2 | 769 | |
5326fd5c S |
770 | /* |
771 | * We are making up these values; let us keep it simple. | |
772 | */ | |
773 | heads = 0xff; | |
774 | sectors_pt = 0x3f; /* Sectors per track */ | |
775 | sector_div(cylinders, heads * sectors_pt); | |
776 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
777 | cylinders = 0xffff; | |
62838ce2 S |
778 | |
779 | info[0] = heads; | |
5326fd5c S |
780 | info[1] = sectors_pt; |
781 | info[2] = (int)cylinders; | |
62838ce2 | 782 | |
62838ce2 S |
783 | return 0; |
784 | } | |
aa3d789e S |
785 | |
786 | static int storvsc_host_reset(struct hv_device *device) | |
787 | { | |
788 | struct storvsc_device *stor_device; | |
789 | struct hv_storvsc_request *request; | |
790 | struct vstor_packet *vstor_packet; | |
791 | int ret, t; | |
792 | ||
aa3d789e | 793 | |
1eaaddf9 | 794 | stor_device = get_out_stor_device(device); |
aa3d789e | 795 | if (!stor_device) |
f3b74165 | 796 | return -ENODEV; |
aa3d789e S |
797 | |
798 | request = &stor_device->reset_request; | |
799 | vstor_packet = &request->vstor_packet; | |
800 | ||
801 | init_completion(&request->wait_event); | |
802 | ||
803 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
804 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
805 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
806 | ||
807 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
808 | sizeof(struct vstor_packet), | |
809 | (unsigned long)&stor_device->reset_request, | |
810 | VM_PKT_DATA_INBAND, | |
811 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
812 | if (ret != 0) | |
813 | goto cleanup; | |
814 | ||
46d2eb6d | 815 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
aa3d789e S |
816 | if (t == 0) { |
817 | ret = -ETIMEDOUT; | |
818 | goto cleanup; | |
819 | } | |
820 | ||
aa3d789e S |
821 | |
822 | /* | |
823 | * At this point, all outstanding requests in the adapter | |
824 | * should have been flushed out and return to us | |
825 | */ | |
826 | ||
827 | cleanup: | |
aa3d789e S |
828 | return ret; |
829 | } | |
830 | ||
831 | ||
96e690be S |
832 | /* |
833 | * storvsc_host_reset_handler - Reset the scsi HBA | |
834 | */ | |
835 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) | |
836 | { | |
837 | int ret; | |
838 | struct hv_host_device *host_dev = | |
839 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
840 | struct hv_device *dev = host_dev->dev; | |
841 | ||
96e690be S |
842 | ret = storvsc_host_reset(dev); |
843 | if (ret != 0) | |
844 | return ret; | |
845 | ||
96e690be S |
846 | return ret; |
847 | } | |
848 | ||
8a411bad S |
849 | |
850 | /* | |
851 | * storvsc_commmand_completion - Command completion processing | |
852 | */ | |
853 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) | |
854 | { | |
855 | struct storvsc_cmd_request *cmd_request = | |
856 | (struct storvsc_cmd_request *)request->context; | |
857 | struct scsi_cmnd *scmnd = cmd_request->cmd; | |
858 | struct hv_host_device *host_dev = | |
859 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
860 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
861 | struct scsi_sense_hdr sense_hdr; | |
862 | struct vmscsi_request *vm_srb; | |
863 | ||
3612ef99 | 864 | vm_srb = &request->vstor_packet.vm_srb; |
8a411bad | 865 | if (cmd_request->bounce_sgl_count) { |
3612ef99 S |
866 | if (vm_srb->data_in == READ_TYPE) { |
867 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
8a411bad S |
868 | cmd_request->bounce_sgl, |
869 | scsi_sg_count(scmnd)); | |
3612ef99 S |
870 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
871 | cmd_request->bounce_sgl_count); | |
872 | } | |
8a411bad S |
873 | } |
874 | ||
8a411bad S |
875 | scmnd->result = vm_srb->scsi_status; |
876 | ||
877 | if (scmnd->result) { | |
878 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
879 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
880 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
881 | } | |
882 | ||
8a411bad S |
883 | scsi_set_resid(scmnd, |
884 | request->data_buffer.len - | |
885 | vm_srb->data_transfer_length); | |
886 | ||
887 | scsi_done_fn = scmnd->scsi_done; | |
888 | ||
889 | scmnd->host_scribble = NULL; | |
890 | scmnd->scsi_done = NULL; | |
891 | ||
8a411bad S |
892 | scsi_done_fn(scmnd); |
893 | ||
894 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
895 | } | |
896 | ||
c5b463ae S |
897 | |
898 | /* | |
899 | * storvsc_queuecommand - Initiate command processing | |
900 | */ | |
901 | static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, | |
902 | void (*done)(struct scsi_cmnd *)) | |
903 | { | |
904 | int ret; | |
905 | struct hv_host_device *host_dev = | |
906 | (struct hv_host_device *)scmnd->device->host->hostdata; | |
907 | struct hv_device *dev = host_dev->dev; | |
c5b463ae S |
908 | struct hv_storvsc_request *request; |
909 | struct storvsc_cmd_request *cmd_request; | |
910 | unsigned int request_size = 0; | |
911 | int i; | |
912 | struct scatterlist *sgl; | |
913 | unsigned int sg_count = 0; | |
914 | struct vmscsi_request *vm_srb; | |
915 | ||
916 | ||
917 | /* If retrying, no need to prep the cmd */ | |
918 | if (scmnd->host_scribble) { | |
c5b463ae S |
919 | |
920 | cmd_request = | |
921 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
c5b463ae S |
922 | |
923 | goto retry_request; | |
924 | } | |
925 | ||
c5b463ae S |
926 | scmnd->scsi_done = done; |
927 | ||
928 | request_size = sizeof(struct storvsc_cmd_request); | |
929 | ||
930 | cmd_request = kmem_cache_zalloc(host_dev->request_pool, | |
931 | GFP_ATOMIC); | |
932 | if (!cmd_request) { | |
933 | scmnd->scsi_done = NULL; | |
934 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
935 | } | |
936 | ||
937 | /* Setup the cmd request */ | |
938 | cmd_request->bounce_sgl_count = 0; | |
939 | cmd_request->bounce_sgl = NULL; | |
940 | cmd_request->cmd = scmnd; | |
941 | ||
942 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
943 | ||
944 | request = &cmd_request->request; | |
945 | vm_srb = &request->vstor_packet.vm_srb; | |
946 | ||
947 | ||
948 | /* Build the SRB */ | |
949 | switch (scmnd->sc_data_direction) { | |
950 | case DMA_TO_DEVICE: | |
951 | vm_srb->data_in = WRITE_TYPE; | |
952 | break; | |
953 | case DMA_FROM_DEVICE: | |
954 | vm_srb->data_in = READ_TYPE; | |
955 | break; | |
956 | default: | |
957 | vm_srb->data_in = UNKNOWN_TYPE; | |
958 | break; | |
959 | } | |
960 | ||
961 | request->on_io_completion = storvsc_commmand_completion; | |
962 | request->context = cmd_request;/* scmnd; */ | |
963 | ||
c5b463ae S |
964 | vm_srb->port_number = host_dev->port; |
965 | vm_srb->path_id = scmnd->device->channel; | |
966 | vm_srb->target_id = scmnd->device->id; | |
967 | vm_srb->lun = scmnd->device->lun; | |
968 | ||
c5b463ae S |
969 | vm_srb->cdb_length = scmnd->cmd_len; |
970 | ||
971 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
972 | ||
973 | request->sense_buffer = scmnd->sense_buffer; | |
974 | ||
975 | ||
976 | request->data_buffer.len = scsi_bufflen(scmnd); | |
977 | if (scsi_sg_count(scmnd)) { | |
978 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
979 | sg_count = scsi_sg_count(scmnd); | |
980 | ||
981 | /* check if we need to bounce the sgl */ | |
982 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
983 | cmd_request->bounce_sgl = | |
984 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
985 | scsi_bufflen(scmnd)); | |
986 | if (!cmd_request->bounce_sgl) { | |
987 | scmnd->scsi_done = NULL; | |
988 | scmnd->host_scribble = NULL; | |
989 | kmem_cache_free(host_dev->request_pool, | |
990 | cmd_request); | |
991 | ||
992 | return SCSI_MLQUEUE_HOST_BUSY; | |
993 | } | |
994 | ||
995 | cmd_request->bounce_sgl_count = | |
996 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
997 | PAGE_SHIFT; | |
998 | ||
fa23b8c7 S |
999 | if (vm_srb->data_in == WRITE_TYPE) |
1000 | copy_to_bounce_buffer(sgl, | |
1001 | cmd_request->bounce_sgl, | |
1002 | scsi_sg_count(scmnd)); | |
c5b463ae S |
1003 | |
1004 | sgl = cmd_request->bounce_sgl; | |
1005 | sg_count = cmd_request->bounce_sgl_count; | |
1006 | } | |
1007 | ||
1008 | request->data_buffer.offset = sgl[0].offset; | |
1009 | ||
1010 | for (i = 0; i < sg_count; i++) | |
1011 | request->data_buffer.pfn_array[i] = | |
1012 | page_to_pfn(sg_page((&sgl[i]))); | |
1013 | ||
1014 | } else if (scsi_sglist(scmnd)) { | |
c5b463ae S |
1015 | request->data_buffer.offset = |
1016 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
1017 | request->data_buffer.pfn_array[0] = | |
1018 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
1019 | } | |
1020 | ||
1021 | retry_request: | |
1022 | /* Invokes the vsc to start an IO */ | |
636f0fd1 S |
1023 | ret = storvsc_do_io(dev, &cmd_request->request); |
1024 | ||
d2598f01 | 1025 | if (ret == -EAGAIN) { |
c5b463ae S |
1026 | /* no more space */ |
1027 | ||
1028 | if (cmd_request->bounce_sgl_count) { | |
1029 | /* | |
1030 | * FIXME: We can optimize on writes by just skipping | |
1031 | * this | |
1032 | */ | |
1033 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
1034 | cmd_request->bounce_sgl, | |
1035 | scsi_sg_count(scmnd)); | |
1036 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
1037 | cmd_request->bounce_sgl_count); | |
1038 | } | |
1039 | ||
1040 | kmem_cache_free(host_dev->request_pool, cmd_request); | |
1041 | ||
1042 | scmnd->scsi_done = NULL; | |
1043 | scmnd->host_scribble = NULL; | |
1044 | ||
1045 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
1046 | } | |
1047 | ||
1048 | return ret; | |
1049 | } | |
1050 | ||
1051 | static DEF_SCSI_QCMD(storvsc_queuecommand) | |
1052 | ||
bef4a34a | 1053 | |
454f18a9 | 1054 | /* Scsi driver */ |
bef4a34a | 1055 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1056 | .module = THIS_MODULE, |
1057 | .name = "storvsc_host_t", | |
1058 | .bios_param = storvsc_get_chs, | |
1059 | .queuecommand = storvsc_queuecommand, | |
1060 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
1061 | .slave_alloc = storvsc_device_alloc, | |
1062 | .slave_configure = storvsc_device_configure, | |
1063 | .cmd_per_lun = 1, | |
1064 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 1065 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 1066 | .this_id = -1, |
454f18a9 | 1067 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
1068 | /* currently 32 */ |
1069 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
1070 | /* | |
1071 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
1072 | * into 1 sg element. If set, we must limit the max_segment_size to | |
1073 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
1074 | * multiple | |
1075 | */ | |
454f18a9 | 1076 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 1077 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 1078 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1079 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
1080 | }; |
1081 | ||
21e37742 S |
1082 | /* |
1083 | * The storvsc_probe function assumes that the IDE guid | |
1084 | * is the second entry. | |
1085 | */ | |
d847b5fe | 1086 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 GKH |
1087 | /* SCSI guid */ |
1088 | { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, | |
1089 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) }, | |
21e37742 S |
1090 | /* IDE guid */ |
1091 | { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, | |
1092 | 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) }, | |
c45cf2d4 | 1093 | { }, |
d847b5fe | 1094 | }; |
bef4a34a | 1095 | |
d847b5fe | 1096 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1097 | |
bd1f5d6a | 1098 | |
3e189519 | 1099 | /* |
ff568d3a GKH |
1100 | * storvsc_probe - Add a new device for this driver |
1101 | */ | |
f5c78872 | 1102 | |
9efd21e1 | 1103 | static int storvsc_probe(struct hv_device *device) |
bef4a34a | 1104 | { |
ff568d3a | 1105 | int ret; |
bef4a34a | 1106 | struct Scsi_Host *host; |
795b613d | 1107 | struct hv_host_device *host_dev; |
9f0c7d2c | 1108 | struct storvsc_device_info device_info; |
bd1f5d6a S |
1109 | bool dev_is_ide; |
1110 | int path = 0; | |
1111 | int target = 0; | |
1112 | ||
21e37742 | 1113 | if (!memcmp(&device->dev_type.b, id_table[1].guid, sizeof(uuid_le))) |
bd1f5d6a S |
1114 | dev_is_ide = true; |
1115 | else | |
1116 | dev_is_ide = false; | |
bef4a34a | 1117 | |
ff568d3a | 1118 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1119 | sizeof(struct hv_host_device)); |
f8feed06 | 1120 | if (!host) |
bef4a34a | 1121 | return -ENOMEM; |
bef4a34a | 1122 | |
9efd21e1 | 1123 | dev_set_drvdata(&device->device, host); |
bef4a34a | 1124 | |
795b613d S |
1125 | host_dev = (struct hv_host_device *)host->hostdata; |
1126 | memset(host_dev, 0, sizeof(struct hv_host_device)); | |
bef4a34a | 1127 | |
795b613d | 1128 | host_dev->port = host->host_no; |
97c15296 | 1129 | host_dev->dev = device; |
bef4a34a | 1130 | |
795b613d | 1131 | host_dev->request_pool = |
9efd21e1 | 1132 | kmem_cache_create(dev_name(&device->device), |
1e05d88e | 1133 | sizeof(struct storvsc_cmd_request), 0, |
ff568d3a GKH |
1134 | SLAB_HWCACHE_ALIGN, NULL); |
1135 | ||
795b613d | 1136 | if (!host_dev->request_pool) { |
bef4a34a | 1137 | scsi_host_put(host); |
bef4a34a HJ |
1138 | return -ENOMEM; |
1139 | } | |
1140 | ||
8a046024 | 1141 | device_info.port_number = host->host_no; |
fa4d123a | 1142 | device_info.ring_buffer_size = storvsc_ringbuffer_size; |
454f18a9 | 1143 | /* Call to the vsc driver to add the device */ |
58f1f5cb | 1144 | ret = storvsc_dev_add(device, (void *)&device_info); |
9efd21e1 | 1145 | |
ff568d3a | 1146 | if (ret != 0) { |
795b613d | 1147 | kmem_cache_destroy(host_dev->request_pool); |
bef4a34a | 1148 | scsi_host_put(host); |
8e854680 | 1149 | return -ENODEV; |
bef4a34a HJ |
1150 | } |
1151 | ||
bd1f5d6a S |
1152 | if (dev_is_ide) |
1153 | storvsc_get_ide_info(device, &target, &path); | |
1154 | ||
795b613d S |
1155 | host_dev->path = device_info.path_id; |
1156 | host_dev->target = device_info.target_id; | |
bef4a34a | 1157 | |
ff568d3a GKH |
1158 | /* max # of devices per target */ |
1159 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
1160 | /* max # of targets per channel */ | |
1161 | host->max_id = STORVSC_MAX_TARGETS; | |
1162 | /* max # of channels */ | |
1163 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 1164 | |
454f18a9 | 1165 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1166 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a S |
1167 | if (ret != 0) |
1168 | goto err_out; | |
bef4a34a | 1169 | |
bd1f5d6a S |
1170 | if (!dev_is_ide) { |
1171 | scsi_scan_host(host); | |
1172 | return 0; | |
1173 | } | |
1174 | ret = scsi_add_device(host, 0, target, 0); | |
1175 | if (ret) { | |
1176 | scsi_remove_host(host); | |
1177 | goto err_out; | |
bef4a34a | 1178 | } |
bd1f5d6a | 1179 | return 0; |
bef4a34a | 1180 | |
bd1f5d6a S |
1181 | err_out: |
1182 | storvsc_dev_remove(device); | |
1183 | kmem_cache_destroy(host_dev->request_pool); | |
1184 | scsi_host_put(host); | |
1185 | return -ENODEV; | |
bef4a34a HJ |
1186 | } |
1187 | ||
7bd05b91 S |
1188 | /* The one and only one */ |
1189 | ||
40bf63ed | 1190 | static struct hv_driver storvsc_drv = { |
768fa219 | 1191 | .name = "storvsc", |
d847b5fe | 1192 | .id_table = id_table, |
40bf63ed S |
1193 | .probe = storvsc_probe, |
1194 | .remove = storvsc_remove, | |
39ae6fae | 1195 | }; |
7bd05b91 | 1196 | |
d9bbae83 | 1197 | static int __init storvsc_drv_init(void) |
f5c78872 | 1198 | { |
01415ab3 S |
1199 | u32 max_outstanding_req_per_channel; |
1200 | ||
1201 | /* | |
1202 | * Divide the ring buffer data size (which is 1 page less | |
1203 | * than the ring buffer size since that page is reserved for | |
1204 | * the ring buffer indices) by the max request size (which is | |
1205 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1206 | */ | |
01415ab3 | 1207 | max_outstanding_req_per_channel = |
768fa219 GKH |
1208 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1209 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
1210 | sizeof(struct vstor_packet) + sizeof(u64), | |
1211 | sizeof(u64))); | |
f5c78872 | 1212 | |
01415ab3 | 1213 | if (max_outstanding_req_per_channel < |
f5c78872 | 1214 | STORVSC_MAX_IO_REQUESTS) |
b06efc19 | 1215 | return -EINVAL; |
f5c78872 | 1216 | |
768fa219 | 1217 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1218 | } |
1219 | ||
c63ba9e1 | 1220 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1221 | { |
768fa219 | 1222 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1223 | } |
1224 | ||
ff568d3a | 1225 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1226 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 1227 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1228 | module_init(storvsc_drv_init); |
c63ba9e1 | 1229 | module_exit(storvsc_drv_exit); |