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> | |
f0d79fe9 | 24 | #include <linux/wait.h> |
a1be1706 S |
25 | #include <linux/sched.h> |
26 | #include <linux/completion.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/delay.h> | |
bef4a34a | 30 | #include <linux/init.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
bef4a34a HJ |
32 | #include <linux/module.h> |
33 | #include <linux/device.h> | |
46a97191 | 34 | #include <linux/hyperv.h> |
4e03e697 | 35 | #include <linux/mempool.h> |
bef4a34a HJ |
36 | #include <scsi/scsi.h> |
37 | #include <scsi/scsi_cmnd.h> | |
38 | #include <scsi/scsi_host.h> | |
39 | #include <scsi/scsi_device.h> | |
40 | #include <scsi/scsi_tcq.h> | |
41 | #include <scsi/scsi_eh.h> | |
42 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 43 | #include <scsi/scsi_dbg.h> |
3f335ea2 | 44 | |
f0d79fe9 | 45 | |
c649114a S |
46 | /* |
47 | * We setup a mempool to allocate request structures for this driver | |
48 | * on a per-lun basis. The following define specifies the number of | |
49 | * elements in the pool. | |
50 | */ | |
51 | ||
4e03e697 | 52 | #define STORVSC_MIN_BUF_NR 64 |
c649114a | 53 | static int storvsc_ringbuffer_size = (20 * PAGE_SIZE); |
c1b3d067 S |
54 | |
55 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
56 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
57 | ||
f0d79fe9 | 58 | |
09f0355f S |
59 | /* |
60 | * Major/minor macros. Minor version is in LSB, meaning that earlier flat | |
61 | * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). | |
62 | */ | |
63 | ||
85904a5e S |
64 | static inline u16 storvsc_get_version(u8 major, u8 minor) |
65 | { | |
66 | u16 version; | |
67 | ||
68 | version = ((major << 8) | minor); | |
69 | return version; | |
70 | } | |
f0d79fe9 | 71 | |
09f0355f S |
72 | /* |
73 | * Version history: | |
74 | * V1 Beta: 0.1 | |
75 | * V1 RC < 2008/1/31: 1.0 | |
76 | * V1 RC > 2008/1/31: 2.0 | |
77 | * Win7: 4.2 | |
78 | */ | |
79 | ||
85904a5e S |
80 | #define VMSTOR_CURRENT_MAJOR 4 |
81 | #define VMSTOR_CURRENT_MINOR 2 | |
f0d79fe9 S |
82 | |
83 | ||
f0d79fe9 S |
84 | /* Packet structure describing virtual storage requests. */ |
85 | enum vstor_packet_operation { | |
86 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
87 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
88 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
89 | VSTOR_OPERATION_RESET_LUN = 4, | |
90 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
91 | VSTOR_OPERATION_RESET_BUS = 6, | |
92 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
93 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
94 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
95 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
2b9525f5 S |
96 | VSTOR_OPERATION_ENUMERATE_BUS = 11, |
97 | VSTOR_OPERATION_MAXIMUM = 11 | |
f0d79fe9 S |
98 | }; |
99 | ||
100 | /* | |
101 | * Platform neutral description of a scsi request - | |
102 | * this remains the same across the write regardless of 32/64 bit | |
103 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
104 | */ | |
6b2f9495 S |
105 | #define STORVSC_MAX_CMD_LEN 0x10 |
106 | #define STORVSC_SENSE_BUFFER_SIZE 0x12 | |
107 | #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 | |
f0d79fe9 S |
108 | |
109 | struct vmscsi_request { | |
c649114a S |
110 | u16 length; |
111 | u8 srb_status; | |
112 | u8 scsi_status; | |
f0d79fe9 | 113 | |
c649114a S |
114 | u8 port_number; |
115 | u8 path_id; | |
116 | u8 target_id; | |
117 | u8 lun; | |
f0d79fe9 | 118 | |
c649114a S |
119 | u8 cdb_length; |
120 | u8 sense_info_length; | |
121 | u8 data_in; | |
122 | u8 reserved; | |
f0d79fe9 | 123 | |
c649114a | 124 | u32 data_transfer_length; |
f0d79fe9 S |
125 | |
126 | union { | |
6b2f9495 S |
127 | u8 cdb[STORVSC_MAX_CMD_LEN]; |
128 | u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; | |
129 | u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; | |
f0d79fe9 S |
130 | }; |
131 | } __attribute((packed)); | |
132 | ||
133 | ||
134 | /* | |
135 | * This structure is sent during the intialization phase to get the different | |
136 | * properties of the channel. | |
137 | */ | |
138 | struct vmstorage_channel_properties { | |
c649114a S |
139 | u16 protocol_version; |
140 | u8 path_id; | |
141 | u8 target_id; | |
f0d79fe9 S |
142 | |
143 | /* Note: port number is only really known on the client side */ | |
c649114a S |
144 | u32 port_number; |
145 | u32 flags; | |
146 | u32 max_transfer_bytes; | |
f0d79fe9 | 147 | |
c649114a S |
148 | /* |
149 | * This id is unique for each channel and will correspond with | |
150 | * vendor specific data in the inquiry data. | |
151 | */ | |
152 | ||
153 | u64 unique_id; | |
f0d79fe9 S |
154 | } __packed; |
155 | ||
156 | /* This structure is sent during the storage protocol negotiations. */ | |
157 | struct vmstorage_protocol_version { | |
158 | /* Major (MSW) and minor (LSW) version numbers. */ | |
85904a5e | 159 | u16 major_minor; |
f0d79fe9 S |
160 | |
161 | /* | |
162 | * Revision number is auto-incremented whenever this file is changed | |
163 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
164 | * definitely indicate incompatibility--but it does indicate mismatched | |
165 | * builds. | |
c649114a | 166 | * This is only used on the windows side. Just set it to 0. |
f0d79fe9 | 167 | */ |
85904a5e | 168 | u16 revision; |
f0d79fe9 S |
169 | } __packed; |
170 | ||
171 | /* Channel Property Flags */ | |
172 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
173 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
174 | ||
175 | struct vstor_packet { | |
176 | /* Requested operation type */ | |
177 | enum vstor_packet_operation operation; | |
178 | ||
179 | /* Flags - see below for values */ | |
c649114a | 180 | u32 flags; |
f0d79fe9 S |
181 | |
182 | /* Status of the request returned from the server side. */ | |
c649114a | 183 | u32 status; |
f0d79fe9 S |
184 | |
185 | /* Data payload area */ | |
186 | union { | |
187 | /* | |
188 | * Structure used to forward SCSI commands from the | |
189 | * client to the server. | |
190 | */ | |
191 | struct vmscsi_request vm_srb; | |
192 | ||
193 | /* Structure used to query channel properties. */ | |
194 | struct vmstorage_channel_properties storage_channel_properties; | |
195 | ||
196 | /* Used during version negotiations. */ | |
197 | struct vmstorage_protocol_version version; | |
198 | }; | |
199 | } __packed; | |
200 | ||
f0d79fe9 | 201 | /* |
09f0355f S |
202 | * Packet Flags: |
203 | * | |
f0d79fe9 S |
204 | * This flag indicates that the server should send back a completion for this |
205 | * packet. | |
206 | */ | |
09f0355f | 207 | |
f0d79fe9 S |
208 | #define REQUEST_COMPLETION_FLAG 0x1 |
209 | ||
f0d79fe9 S |
210 | #define STORVSC_MAX_IO_REQUESTS 128 |
211 | ||
212 | /* | |
213 | * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In | |
214 | * reality, the path/target is not used (ie always set to 0) so our | |
215 | * scsi host adapter essentially has 1 bus with 1 target that contains | |
216 | * up to 256 luns. | |
217 | */ | |
218 | #define STORVSC_MAX_LUNS_PER_TARGET 64 | |
219 | #define STORVSC_MAX_TARGETS 1 | |
220 | #define STORVSC_MAX_CHANNELS 1 | |
221 | ||
f0d79fe9 S |
222 | /* Matches Windows-end */ |
223 | enum storvsc_request_type { | |
c649114a | 224 | WRITE_TYPE = 0, |
f0d79fe9 S |
225 | READ_TYPE, |
226 | UNKNOWN_TYPE, | |
227 | }; | |
228 | ||
16046320 S |
229 | /* |
230 | * SRB status codes and masks; a subset of the codes used here. | |
231 | */ | |
232 | ||
233 | #define SRB_STATUS_AUTOSENSE_VALID 0x80 | |
234 | #define SRB_STATUS_INVALID_LUN 0x20 | |
235 | #define SRB_STATUS_SUCCESS 0x01 | |
236 | #define SRB_STATUS_ERROR 0x04 | |
237 | ||
238 | ||
f0d79fe9 S |
239 | |
240 | struct hv_storvsc_request { | |
f0d79fe9 S |
241 | struct hv_device *device; |
242 | ||
243 | /* Synchronize the request/response if needed */ | |
244 | struct completion wait_event; | |
245 | ||
246 | unsigned char *sense_buffer; | |
93a1bf4d | 247 | struct storvsc_cmd_request *cmd; |
f0d79fe9 S |
248 | struct hv_multipage_buffer data_buffer; |
249 | ||
250 | struct vstor_packet vstor_packet; | |
251 | }; | |
252 | ||
253 | ||
f0d79fe9 S |
254 | /* A storvsc device is a device object that contains a vmbus channel */ |
255 | struct storvsc_device { | |
256 | struct hv_device *device; | |
257 | ||
258 | bool destroy; | |
259 | bool drain_notify; | |
260 | atomic_t num_outstanding_req; | |
cd654ea1 | 261 | struct Scsi_Host *host; |
f0d79fe9 S |
262 | |
263 | wait_queue_head_t waiting_to_drain; | |
264 | ||
265 | /* | |
266 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
267 | * controller. In reality, the pathid, targetid is always 0 | |
268 | * and the port is set by us | |
269 | */ | |
270 | unsigned int port_number; | |
271 | unsigned char path_id; | |
272 | unsigned char target_id; | |
273 | ||
274 | /* Used for vsc/vsp channel reset process */ | |
275 | struct hv_storvsc_request init_request; | |
276 | struct hv_storvsc_request reset_request; | |
277 | }; | |
278 | ||
ce3e301c | 279 | struct stor_mem_pools { |
c1b3d067 | 280 | struct kmem_cache *request_pool; |
4e03e697 | 281 | mempool_t *request_mempool; |
ce3e301c S |
282 | }; |
283 | ||
284 | struct hv_host_device { | |
285 | struct hv_device *dev; | |
c1b3d067 S |
286 | unsigned int port; |
287 | unsigned char path; | |
288 | unsigned char target; | |
289 | }; | |
290 | ||
291 | struct storvsc_cmd_request { | |
292 | struct list_head entry; | |
293 | struct scsi_cmnd *cmd; | |
294 | ||
295 | unsigned int bounce_sgl_count; | |
296 | struct scatterlist *bounce_sgl; | |
297 | ||
298 | struct hv_storvsc_request request; | |
299 | }; | |
f0d79fe9 | 300 | |
12675799 S |
301 | struct storvsc_scan_work { |
302 | struct work_struct work; | |
303 | struct Scsi_Host *host; | |
304 | uint lun; | |
305 | }; | |
306 | ||
307 | static void storvsc_bus_scan(struct work_struct *work) | |
308 | { | |
309 | struct storvsc_scan_work *wrk; | |
310 | int id, order_id; | |
311 | ||
312 | wrk = container_of(work, struct storvsc_scan_work, work); | |
313 | for (id = 0; id < wrk->host->max_id; ++id) { | |
314 | if (wrk->host->reverse_ordering) | |
315 | order_id = wrk->host->max_id - id - 1; | |
316 | else | |
317 | order_id = id; | |
318 | ||
319 | scsi_scan_target(&wrk->host->shost_gendev, 0, | |
320 | order_id, SCAN_WILD_CARD, 1); | |
321 | } | |
322 | kfree(wrk); | |
323 | } | |
324 | ||
b4017319 S |
325 | static void storvsc_remove_lun(struct work_struct *work) |
326 | { | |
327 | struct storvsc_scan_work *wrk; | |
328 | struct scsi_device *sdev; | |
329 | ||
330 | wrk = container_of(work, struct storvsc_scan_work, work); | |
331 | if (!scsi_host_get(wrk->host)) | |
332 | goto done; | |
333 | ||
334 | sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); | |
335 | ||
336 | if (sdev) { | |
337 | scsi_remove_device(sdev); | |
338 | scsi_device_put(sdev); | |
339 | } | |
340 | scsi_host_put(wrk->host); | |
341 | ||
342 | done: | |
343 | kfree(wrk); | |
344 | } | |
345 | ||
a8c18c57 S |
346 | /* |
347 | * We can get incoming messages from the host that are not in response to | |
348 | * messages that we have sent out. An example of this would be messages | |
349 | * received by the guest to notify dynamic addition/removal of LUNs. To | |
350 | * deal with potential race conditions where the driver may be in the | |
351 | * midst of being unloaded when we might receive an unsolicited message | |
352 | * from the host, we have implemented a mechanism to gurantee sequential | |
353 | * consistency: | |
354 | * | |
355 | * 1) Once the device is marked as being destroyed, we will fail all | |
356 | * outgoing messages. | |
357 | * 2) We permit incoming messages when the device is being destroyed, | |
358 | * only to properly account for messages already sent out. | |
359 | */ | |
360 | ||
f0d79fe9 S |
361 | static inline struct storvsc_device *get_out_stor_device( |
362 | struct hv_device *device) | |
363 | { | |
364 | struct storvsc_device *stor_device; | |
365 | ||
cd654ea1 | 366 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
367 | |
368 | if (stor_device && stor_device->destroy) | |
369 | stor_device = NULL; | |
370 | ||
371 | return stor_device; | |
372 | } | |
373 | ||
374 | ||
375 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
376 | { | |
377 | dev->drain_notify = true; | |
378 | wait_event(dev->waiting_to_drain, | |
379 | atomic_read(&dev->num_outstanding_req) == 0); | |
380 | dev->drain_notify = false; | |
381 | } | |
bef4a34a | 382 | |
8dcf37d4 S |
383 | static inline struct storvsc_device *get_in_stor_device( |
384 | struct hv_device *device) | |
385 | { | |
386 | struct storvsc_device *stor_device; | |
8dcf37d4 | 387 | |
cd654ea1 | 388 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
389 | |
390 | if (!stor_device) | |
391 | goto get_in_err; | |
392 | ||
393 | /* | |
394 | * If the device is being destroyed; allow incoming | |
395 | * traffic only to cleanup outstanding requests. | |
396 | */ | |
397 | ||
398 | if (stor_device->destroy && | |
399 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
400 | stor_device = NULL; | |
401 | ||
402 | get_in_err: | |
8dcf37d4 S |
403 | return stor_device; |
404 | ||
405 | } | |
406 | ||
2707388c S |
407 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
408 | unsigned int sg_count) | |
409 | { | |
410 | int i; | |
411 | struct page *page_buf; | |
412 | ||
413 | for (i = 0; i < sg_count; i++) { | |
414 | page_buf = sg_page((&sgl[i])); | |
415 | if (page_buf != NULL) | |
416 | __free_page(page_buf); | |
417 | } | |
418 | ||
419 | kfree(sgl); | |
420 | } | |
421 | ||
422 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
423 | { | |
424 | int i; | |
425 | ||
426 | /* No need to check */ | |
427 | if (sg_count < 2) | |
428 | return -1; | |
429 | ||
430 | /* We have at least 2 sg entries */ | |
431 | for (i = 0; i < sg_count; i++) { | |
432 | if (i == 0) { | |
433 | /* make sure 1st one does not have hole */ | |
434 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
435 | return i; | |
436 | } else if (i == sg_count - 1) { | |
437 | /* make sure last one does not have hole */ | |
438 | if (sgl[i].offset != 0) | |
439 | return i; | |
440 | } else { | |
441 | /* make sure no hole in the middle */ | |
442 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
443 | return i; | |
444 | } | |
445 | } | |
446 | return -1; | |
447 | } | |
448 | ||
449 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, | |
450 | unsigned int sg_count, | |
451 | unsigned int len, | |
452 | int write) | |
453 | { | |
454 | int i; | |
455 | int num_pages; | |
456 | struct scatterlist *bounce_sgl; | |
457 | struct page *page_buf; | |
458 | unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE); | |
459 | ||
460 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
461 | ||
462 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
463 | if (!bounce_sgl) | |
464 | return NULL; | |
465 | ||
466 | for (i = 0; i < num_pages; i++) { | |
467 | page_buf = alloc_page(GFP_ATOMIC); | |
468 | if (!page_buf) | |
469 | goto cleanup; | |
470 | sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0); | |
471 | } | |
472 | ||
473 | return bounce_sgl; | |
474 | ||
475 | cleanup: | |
476 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
477 | return NULL; | |
478 | } | |
479 | ||
480 | /* Assume the original sgl has enough room */ | |
481 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
482 | struct scatterlist *bounce_sgl, | |
483 | unsigned int orig_sgl_count, | |
484 | unsigned int bounce_sgl_count) | |
485 | { | |
486 | int i; | |
487 | int j = 0; | |
488 | unsigned long src, dest; | |
489 | unsigned int srclen, destlen, copylen; | |
490 | unsigned int total_copied = 0; | |
491 | unsigned long bounce_addr = 0; | |
492 | unsigned long dest_addr = 0; | |
493 | unsigned long flags; | |
494 | ||
495 | local_irq_save(flags); | |
496 | ||
497 | for (i = 0; i < orig_sgl_count; i++) { | |
498 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
499 | KM_IRQ0) + orig_sgl[i].offset; | |
500 | dest = dest_addr; | |
501 | destlen = orig_sgl[i].length; | |
502 | ||
503 | if (bounce_addr == 0) | |
504 | bounce_addr = | |
505 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
506 | KM_IRQ0); | |
507 | ||
508 | while (destlen) { | |
509 | src = bounce_addr + bounce_sgl[j].offset; | |
510 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
511 | ||
512 | copylen = min(srclen, destlen); | |
513 | memcpy((void *)dest, (void *)src, copylen); | |
514 | ||
515 | total_copied += copylen; | |
516 | bounce_sgl[j].offset += copylen; | |
517 | destlen -= copylen; | |
518 | dest += copylen; | |
519 | ||
520 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
521 | /* full */ | |
522 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
523 | j++; | |
524 | ||
525 | /* | |
526 | * It is possible that the number of elements | |
527 | * in the bounce buffer may not be equal to | |
528 | * the number of elements in the original | |
529 | * scatter list. Handle this correctly. | |
530 | */ | |
531 | ||
532 | if (j == bounce_sgl_count) { | |
533 | /* | |
534 | * We are done; cleanup and return. | |
535 | */ | |
536 | kunmap_atomic((void *)(dest_addr - | |
537 | orig_sgl[i].offset), | |
538 | KM_IRQ0); | |
539 | local_irq_restore(flags); | |
540 | return total_copied; | |
541 | } | |
542 | ||
543 | /* if we need to use another bounce buffer */ | |
544 | if (destlen || i != orig_sgl_count - 1) | |
545 | bounce_addr = | |
546 | (unsigned long)kmap_atomic( | |
547 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
548 | } else if (destlen == 0 && i == orig_sgl_count - 1) { | |
549 | /* unmap the last bounce that is < PAGE_SIZE */ | |
550 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
551 | } | |
552 | } | |
553 | ||
554 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), | |
555 | KM_IRQ0); | |
556 | } | |
557 | ||
558 | local_irq_restore(flags); | |
559 | ||
560 | return total_copied; | |
561 | } | |
562 | ||
563 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
564 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
565 | struct scatterlist *bounce_sgl, | |
566 | unsigned int orig_sgl_count) | |
567 | { | |
568 | int i; | |
569 | int j = 0; | |
570 | unsigned long src, dest; | |
571 | unsigned int srclen, destlen, copylen; | |
572 | unsigned int total_copied = 0; | |
573 | unsigned long bounce_addr = 0; | |
574 | unsigned long src_addr = 0; | |
575 | unsigned long flags; | |
576 | ||
577 | local_irq_save(flags); | |
578 | ||
579 | for (i = 0; i < orig_sgl_count; i++) { | |
580 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
581 | KM_IRQ0) + orig_sgl[i].offset; | |
582 | src = src_addr; | |
583 | srclen = orig_sgl[i].length; | |
584 | ||
585 | if (bounce_addr == 0) | |
586 | bounce_addr = | |
587 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
588 | KM_IRQ0); | |
589 | ||
590 | while (srclen) { | |
591 | /* assume bounce offset always == 0 */ | |
592 | dest = bounce_addr + bounce_sgl[j].length; | |
593 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
594 | ||
595 | copylen = min(srclen, destlen); | |
596 | memcpy((void *)dest, (void *)src, copylen); | |
597 | ||
598 | total_copied += copylen; | |
599 | bounce_sgl[j].length += copylen; | |
600 | srclen -= copylen; | |
601 | src += copylen; | |
602 | ||
603 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
604 | /* full..move to next entry */ | |
605 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
606 | j++; | |
607 | ||
608 | /* if we need to use another bounce buffer */ | |
609 | if (srclen || i != orig_sgl_count - 1) | |
610 | bounce_addr = | |
611 | (unsigned long)kmap_atomic( | |
612 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
613 | ||
614 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
615 | /* unmap the last bounce that is < PAGE_SIZE */ | |
616 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
617 | } | |
618 | } | |
619 | ||
620 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
621 | } | |
622 | ||
623 | local_irq_restore(flags); | |
624 | ||
625 | return total_copied; | |
626 | } | |
627 | ||
8dcf37d4 S |
628 | static int storvsc_channel_init(struct hv_device *device) |
629 | { | |
630 | struct storvsc_device *stor_device; | |
631 | struct hv_storvsc_request *request; | |
632 | struct vstor_packet *vstor_packet; | |
633 | int ret, t; | |
634 | ||
635 | stor_device = get_out_stor_device(device); | |
636 | if (!stor_device) | |
637 | return -ENODEV; | |
638 | ||
639 | request = &stor_device->init_request; | |
640 | vstor_packet = &request->vstor_packet; | |
641 | ||
642 | /* | |
643 | * Now, initiate the vsc/vsp initialization protocol on the open | |
644 | * channel | |
645 | */ | |
646 | memset(request, 0, sizeof(struct hv_storvsc_request)); | |
647 | init_completion(&request->wait_event); | |
648 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
649 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
650 | ||
651 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
652 | sizeof(struct vstor_packet), | |
653 | (unsigned long)request, | |
654 | VM_PKT_DATA_INBAND, | |
655 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
656 | if (ret != 0) | |
657 | goto cleanup; | |
658 | ||
659 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
660 | if (t == 0) { | |
661 | ret = -ETIMEDOUT; | |
662 | goto cleanup; | |
663 | } | |
664 | ||
665 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
666 | vstor_packet->status != 0) | |
667 | goto cleanup; | |
668 | ||
669 | ||
670 | /* reuse the packet for version range supported */ | |
671 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
672 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
673 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
674 | ||
85904a5e S |
675 | vstor_packet->version.major_minor = |
676 | storvsc_get_version(VMSTOR_CURRENT_MAJOR, VMSTOR_CURRENT_MINOR); | |
677 | ||
678 | /* | |
679 | * The revision number is only used in Windows; set it to 0. | |
680 | */ | |
c649114a | 681 | vstor_packet->version.revision = 0; |
8dcf37d4 S |
682 | |
683 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
684 | sizeof(struct vstor_packet), | |
685 | (unsigned long)request, | |
686 | VM_PKT_DATA_INBAND, | |
687 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
688 | if (ret != 0) | |
689 | goto cleanup; | |
690 | ||
691 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
692 | if (t == 0) { | |
693 | ret = -ETIMEDOUT; | |
694 | goto cleanup; | |
695 | } | |
696 | ||
697 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
698 | vstor_packet->status != 0) | |
699 | goto cleanup; | |
700 | ||
701 | ||
702 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
703 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
704 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
705 | vstor_packet->storage_channel_properties.port_number = | |
706 | stor_device->port_number; | |
707 | ||
708 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
709 | sizeof(struct vstor_packet), | |
710 | (unsigned long)request, | |
711 | VM_PKT_DATA_INBAND, | |
712 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
713 | ||
714 | if (ret != 0) | |
715 | goto cleanup; | |
716 | ||
717 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
718 | if (t == 0) { | |
719 | ret = -ETIMEDOUT; | |
720 | goto cleanup; | |
721 | } | |
722 | ||
723 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
724 | vstor_packet->status != 0) | |
725 | goto cleanup; | |
726 | ||
727 | stor_device->path_id = vstor_packet->storage_channel_properties.path_id; | |
728 | stor_device->target_id | |
729 | = vstor_packet->storage_channel_properties.target_id; | |
730 | ||
731 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
732 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
733 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
734 | ||
735 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
736 | sizeof(struct vstor_packet), | |
737 | (unsigned long)request, | |
738 | VM_PKT_DATA_INBAND, | |
739 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
740 | ||
741 | if (ret != 0) | |
742 | goto cleanup; | |
743 | ||
744 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
745 | if (t == 0) { | |
746 | ret = -ETIMEDOUT; | |
747 | goto cleanup; | |
748 | } | |
749 | ||
750 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
751 | vstor_packet->status != 0) | |
752 | goto cleanup; | |
753 | ||
754 | ||
755 | cleanup: | |
756 | return ret; | |
757 | } | |
758 | ||
2707388c S |
759 | |
760 | static void storvsc_command_completion(struct hv_storvsc_request *request) | |
8dcf37d4 | 761 | { |
93a1bf4d | 762 | struct storvsc_cmd_request *cmd_request = request->cmd; |
2707388c S |
763 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
764 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); | |
765 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
766 | struct scsi_sense_hdr sense_hdr; | |
767 | struct vmscsi_request *vm_srb; | |
768 | struct storvsc_scan_work *wrk; | |
769 | struct stor_mem_pools *memp = scmnd->device->hostdata; | |
8dcf37d4 | 770 | |
2707388c S |
771 | vm_srb = &request->vstor_packet.vm_srb; |
772 | if (cmd_request->bounce_sgl_count) { | |
773 | if (vm_srb->data_in == READ_TYPE) | |
774 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
775 | cmd_request->bounce_sgl, | |
776 | scsi_sg_count(scmnd), | |
777 | cmd_request->bounce_sgl_count); | |
778 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
779 | cmd_request->bounce_sgl_count); | |
780 | } | |
8dcf37d4 | 781 | |
4ed51a21 | 782 | /* |
2707388c S |
783 | * If there is an error; offline the device since all |
784 | * error recovery strategies would have already been | |
785 | * deployed on the host side. | |
786 | */ | |
787 | if (vm_srb->srb_status == SRB_STATUS_ERROR) | |
788 | scmnd->result = DID_TARGET_FAILURE << 16; | |
789 | else | |
790 | scmnd->result = vm_srb->scsi_status; | |
791 | ||
792 | /* | |
793 | * If the LUN is invalid; remove the device. | |
794 | */ | |
795 | if (vm_srb->srb_status == SRB_STATUS_INVALID_LUN) { | |
796 | struct storvsc_device *stor_dev; | |
797 | struct hv_device *dev = host_dev->dev; | |
798 | struct Scsi_Host *host; | |
799 | ||
800 | stor_dev = get_in_stor_device(dev); | |
801 | host = stor_dev->host; | |
802 | ||
803 | wrk = kmalloc(sizeof(struct storvsc_scan_work), | |
804 | GFP_ATOMIC); | |
805 | if (!wrk) { | |
806 | scmnd->result = DID_TARGET_FAILURE << 16; | |
807 | } else { | |
808 | wrk->host = host; | |
809 | wrk->lun = vm_srb->lun; | |
810 | INIT_WORK(&wrk->work, storvsc_remove_lun); | |
811 | schedule_work(&wrk->work); | |
812 | } | |
813 | } | |
814 | ||
815 | if (scmnd->result) { | |
816 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
817 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
818 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
819 | } | |
820 | ||
821 | scsi_set_resid(scmnd, | |
822 | request->data_buffer.len - | |
823 | vm_srb->data_transfer_length); | |
824 | ||
825 | scsi_done_fn = scmnd->scsi_done; | |
826 | ||
827 | scmnd->host_scribble = NULL; | |
828 | scmnd->scsi_done = NULL; | |
829 | ||
830 | scsi_done_fn(scmnd); | |
831 | ||
832 | mempool_free(cmd_request, memp->request_mempool); | |
833 | } | |
834 | ||
835 | static void storvsc_on_io_completion(struct hv_device *device, | |
836 | struct vstor_packet *vstor_packet, | |
837 | struct hv_storvsc_request *request) | |
838 | { | |
839 | struct storvsc_device *stor_device; | |
840 | struct vstor_packet *stor_pkt; | |
841 | ||
842 | stor_device = hv_get_drvdata(device); | |
843 | stor_pkt = &request->vstor_packet; | |
844 | ||
845 | /* | |
846 | * The current SCSI handling on the host side does | |
847 | * not correctly handle: | |
848 | * INQUIRY command with page code parameter set to 0x80 | |
849 | * MODE_SENSE command with cmd[2] == 0x1c | |
850 | * | |
851 | * Setup srb and scsi status so this won't be fatal. | |
852 | * We do this so we can distinguish truly fatal failues | |
4ed51a21 S |
853 | * (srb status == 0x4) and off-line the device in that case. |
854 | */ | |
855 | ||
856 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
a8c18c57 | 857 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
4ed51a21 | 858 | vstor_packet->vm_srb.scsi_status = 0; |
16046320 | 859 | vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
4ed51a21 S |
860 | } |
861 | ||
8dcf37d4 S |
862 | |
863 | /* Copy over the status...etc */ | |
864 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
865 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
866 | stor_pkt->vm_srb.sense_info_length = | |
867 | vstor_packet->vm_srb.sense_info_length; | |
868 | ||
869 | if (vstor_packet->vm_srb.scsi_status != 0 || | |
16046320 | 870 | vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){ |
d181daa0 GKH |
871 | dev_warn(&device->device, |
872 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
873 | stor_pkt->vm_srb.cdb[0], | |
874 | vstor_packet->vm_srb.scsi_status, | |
875 | vstor_packet->vm_srb.srb_status); | |
8dcf37d4 S |
876 | } |
877 | ||
878 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
879 | /* CHECK_CONDITION */ | |
16046320 S |
880 | if (vstor_packet->vm_srb.srb_status & |
881 | SRB_STATUS_AUTOSENSE_VALID) { | |
8dcf37d4 | 882 | /* autosense data available */ |
d181daa0 | 883 | dev_warn(&device->device, |
41098f8f S |
884 | "stor pkt %p autosense data valid - len %d\n", |
885 | request, | |
886 | vstor_packet->vm_srb.sense_info_length); | |
8dcf37d4 S |
887 | |
888 | memcpy(request->sense_buffer, | |
889 | vstor_packet->vm_srb.sense_data, | |
890 | vstor_packet->vm_srb.sense_info_length); | |
891 | ||
892 | } | |
893 | } | |
894 | ||
895 | stor_pkt->vm_srb.data_transfer_length = | |
896 | vstor_packet->vm_srb.data_transfer_length; | |
897 | ||
2707388c | 898 | storvsc_command_completion(request); |
8dcf37d4 S |
899 | |
900 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
901 | stor_device->drain_notify) | |
902 | wake_up(&stor_device->waiting_to_drain); | |
903 | ||
904 | ||
905 | } | |
906 | ||
907 | static void storvsc_on_receive(struct hv_device *device, | |
908 | struct vstor_packet *vstor_packet, | |
909 | struct hv_storvsc_request *request) | |
910 | { | |
12675799 S |
911 | struct storvsc_scan_work *work; |
912 | struct storvsc_device *stor_device; | |
913 | ||
8dcf37d4 S |
914 | switch (vstor_packet->operation) { |
915 | case VSTOR_OPERATION_COMPLETE_IO: | |
916 | storvsc_on_io_completion(device, vstor_packet, request); | |
917 | break; | |
12675799 | 918 | |
8dcf37d4 | 919 | case VSTOR_OPERATION_REMOVE_DEVICE: |
12675799 S |
920 | case VSTOR_OPERATION_ENUMERATE_BUS: |
921 | stor_device = get_in_stor_device(device); | |
922 | work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
923 | if (!work) | |
924 | return; | |
925 | ||
926 | INIT_WORK(&work->work, storvsc_bus_scan); | |
927 | work->host = stor_device->host; | |
928 | schedule_work(&work->work); | |
929 | break; | |
8dcf37d4 S |
930 | |
931 | default: | |
932 | break; | |
933 | } | |
934 | } | |
935 | ||
936 | static void storvsc_on_channel_callback(void *context) | |
937 | { | |
938 | struct hv_device *device = (struct hv_device *)context; | |
939 | struct storvsc_device *stor_device; | |
940 | u32 bytes_recvd; | |
941 | u64 request_id; | |
942 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
943 | struct hv_storvsc_request *request; | |
944 | int ret; | |
945 | ||
946 | ||
947 | stor_device = get_in_stor_device(device); | |
948 | if (!stor_device) | |
949 | return; | |
950 | ||
951 | do { | |
952 | ret = vmbus_recvpacket(device->channel, packet, | |
953 | ALIGN(sizeof(struct vstor_packet), 8), | |
954 | &bytes_recvd, &request_id); | |
955 | if (ret == 0 && bytes_recvd > 0) { | |
956 | ||
957 | request = (struct hv_storvsc_request *) | |
958 | (unsigned long)request_id; | |
959 | ||
960 | if ((request == &stor_device->init_request) || | |
961 | (request == &stor_device->reset_request)) { | |
962 | ||
963 | memcpy(&request->vstor_packet, packet, | |
964 | sizeof(struct vstor_packet)); | |
965 | complete(&request->wait_event); | |
966 | } else { | |
967 | storvsc_on_receive(device, | |
968 | (struct vstor_packet *)packet, | |
969 | request); | |
970 | } | |
971 | } else { | |
972 | break; | |
973 | } | |
974 | } while (1); | |
975 | ||
976 | return; | |
977 | } | |
978 | ||
979 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
980 | { | |
981 | struct vmstorage_channel_properties props; | |
982 | int ret; | |
983 | ||
984 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
985 | ||
8dcf37d4 S |
986 | ret = vmbus_open(device->channel, |
987 | ring_size, | |
988 | ring_size, | |
989 | (void *)&props, | |
990 | sizeof(struct vmstorage_channel_properties), | |
991 | storvsc_on_channel_callback, device); | |
992 | ||
993 | if (ret != 0) | |
994 | return ret; | |
995 | ||
996 | ret = storvsc_channel_init(device); | |
997 | ||
998 | return ret; | |
999 | } | |
1000 | ||
c1b3d067 | 1001 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
1002 | { |
1003 | struct storvsc_device *stor_device; | |
1004 | unsigned long flags; | |
1005 | ||
cd654ea1 | 1006 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
1007 | |
1008 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
1009 | stor_device->destroy = true; | |
1010 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
1011 | ||
1012 | /* | |
1013 | * At this point, all outbound traffic should be disable. We | |
1014 | * only allow inbound traffic (responses) to proceed so that | |
1015 | * outstanding requests can be completed. | |
1016 | */ | |
1017 | ||
1018 | storvsc_wait_to_drain(stor_device); | |
1019 | ||
1020 | /* | |
1021 | * Since we have already drained, we don't need to busy wait | |
1022 | * as was done in final_release_stor_device() | |
1023 | * Note that we cannot set the ext pointer to NULL until | |
1024 | * we have drained - to drain the outgoing packets, we need to | |
1025 | * allow incoming packets. | |
1026 | */ | |
1027 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
cd654ea1 | 1028 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
1029 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
1030 | ||
1031 | /* Close the channel */ | |
1032 | vmbus_close(device->channel); | |
1033 | ||
1034 | kfree(stor_device); | |
1035 | return 0; | |
1036 | } | |
1037 | ||
c1b3d067 | 1038 | static int storvsc_do_io(struct hv_device *device, |
8dcf37d4 S |
1039 | struct hv_storvsc_request *request) |
1040 | { | |
1041 | struct storvsc_device *stor_device; | |
1042 | struct vstor_packet *vstor_packet; | |
1043 | int ret = 0; | |
1044 | ||
1045 | vstor_packet = &request->vstor_packet; | |
1046 | stor_device = get_out_stor_device(device); | |
1047 | ||
1048 | if (!stor_device) | |
1049 | return -ENODEV; | |
1050 | ||
1051 | ||
1052 | request->device = device; | |
1053 | ||
1054 | ||
1055 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
1056 | ||
1057 | vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); | |
1058 | ||
1059 | ||
6b2f9495 | 1060 | vstor_packet->vm_srb.sense_info_length = STORVSC_SENSE_BUFFER_SIZE; |
8dcf37d4 S |
1061 | |
1062 | ||
1063 | vstor_packet->vm_srb.data_transfer_length = | |
1064 | request->data_buffer.len; | |
1065 | ||
1066 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
1067 | ||
1068 | if (request->data_buffer.len) { | |
1069 | ret = vmbus_sendpacket_multipagebuffer(device->channel, | |
1070 | &request->data_buffer, | |
1071 | vstor_packet, | |
1072 | sizeof(struct vstor_packet), | |
1073 | (unsigned long)request); | |
1074 | } else { | |
1075 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
1076 | sizeof(struct vstor_packet), | |
1077 | (unsigned long)request, | |
1078 | VM_PKT_DATA_INBAND, | |
1079 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1080 | } | |
1081 | ||
1082 | if (ret != 0) | |
1083 | return ret; | |
1084 | ||
1085 | atomic_inc(&stor_device->num_outstanding_req); | |
1086 | ||
1087 | return ret; | |
1088 | } | |
1089 | ||
5b60acee S |
1090 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
1091 | { | |
ce3e301c S |
1092 | struct stor_mem_pools *memp; |
1093 | int number = STORVSC_MIN_BUF_NR; | |
1094 | ||
1095 | memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL); | |
1096 | if (!memp) | |
1097 | return -ENOMEM; | |
1098 | ||
1099 | memp->request_pool = | |
1100 | kmem_cache_create(dev_name(&sdevice->sdev_dev), | |
1101 | sizeof(struct storvsc_cmd_request), 0, | |
1102 | SLAB_HWCACHE_ALIGN, NULL); | |
1103 | ||
1104 | if (!memp->request_pool) | |
1105 | goto err0; | |
1106 | ||
1107 | memp->request_mempool = mempool_create(number, mempool_alloc_slab, | |
1108 | mempool_free_slab, | |
1109 | memp->request_pool); | |
1110 | ||
1111 | if (!memp->request_mempool) | |
1112 | goto err1; | |
1113 | ||
1114 | sdevice->hostdata = memp; | |
1115 | ||
5b60acee | 1116 | return 0; |
ce3e301c S |
1117 | |
1118 | err1: | |
1119 | kmem_cache_destroy(memp->request_pool); | |
1120 | ||
1121 | err0: | |
1122 | kfree(memp); | |
1123 | return -ENOMEM; | |
1124 | } | |
1125 | ||
1126 | static void storvsc_device_destroy(struct scsi_device *sdevice) | |
1127 | { | |
1128 | struct stor_mem_pools *memp = sdevice->hostdata; | |
1129 | ||
1130 | mempool_destroy(memp->request_mempool); | |
1131 | kmem_cache_destroy(memp->request_pool); | |
1132 | kfree(memp); | |
1133 | sdevice->hostdata = NULL; | |
5b60acee S |
1134 | } |
1135 | ||
419f2d03 S |
1136 | static int storvsc_device_configure(struct scsi_device *sdevice) |
1137 | { | |
1138 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
1139 | STORVSC_MAX_IO_REQUESTS); | |
1140 | ||
419f2d03 S |
1141 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
1142 | ||
419f2d03 | 1143 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); |
419f2d03 S |
1144 | |
1145 | return 0; | |
1146 | } | |
1147 | ||
62838ce2 S |
1148 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
1149 | sector_t capacity, int *info) | |
1150 | { | |
5326fd5c S |
1151 | sector_t nsect = capacity; |
1152 | sector_t cylinders = nsect; | |
1153 | int heads, sectors_pt; | |
62838ce2 | 1154 | |
5326fd5c S |
1155 | /* |
1156 | * We are making up these values; let us keep it simple. | |
1157 | */ | |
1158 | heads = 0xff; | |
1159 | sectors_pt = 0x3f; /* Sectors per track */ | |
1160 | sector_div(cylinders, heads * sectors_pt); | |
1161 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1162 | cylinders = 0xffff; | |
62838ce2 S |
1163 | |
1164 | info[0] = heads; | |
5326fd5c S |
1165 | info[1] = sectors_pt; |
1166 | info[2] = (int)cylinders; | |
62838ce2 | 1167 | |
62838ce2 S |
1168 | return 0; |
1169 | } | |
aa3d789e | 1170 | |
4b270c8b | 1171 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
aa3d789e | 1172 | { |
4b270c8b S |
1173 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
1174 | struct hv_device *device = host_dev->dev; | |
1175 | ||
aa3d789e S |
1176 | struct storvsc_device *stor_device; |
1177 | struct hv_storvsc_request *request; | |
1178 | struct vstor_packet *vstor_packet; | |
1179 | int ret, t; | |
1180 | ||
aa3d789e | 1181 | |
1eaaddf9 | 1182 | stor_device = get_out_stor_device(device); |
aa3d789e | 1183 | if (!stor_device) |
a00e8224 | 1184 | return FAILED; |
aa3d789e S |
1185 | |
1186 | request = &stor_device->reset_request; | |
1187 | vstor_packet = &request->vstor_packet; | |
1188 | ||
1189 | init_completion(&request->wait_event); | |
1190 | ||
1191 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1192 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1193 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1194 | ||
1195 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
1196 | sizeof(struct vstor_packet), | |
1197 | (unsigned long)&stor_device->reset_request, | |
1198 | VM_PKT_DATA_INBAND, | |
1199 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1200 | if (ret != 0) | |
a00e8224 | 1201 | return FAILED; |
aa3d789e | 1202 | |
46d2eb6d | 1203 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1204 | if (t == 0) |
1205 | return TIMEOUT_ERROR; | |
aa3d789e | 1206 | |
aa3d789e S |
1207 | |
1208 | /* | |
1209 | * At this point, all outstanding requests in the adapter | |
1210 | * should have been flushed out and return to us | |
1211 | */ | |
1212 | ||
a00e8224 | 1213 | return SUCCESS; |
aa3d789e S |
1214 | } |
1215 | ||
c77b63b6 | 1216 | static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
92ae4ebd OH |
1217 | { |
1218 | bool allowed = true; | |
1219 | u8 scsi_op = scmnd->cmnd[0]; | |
1220 | ||
1221 | switch (scsi_op) { | |
c77b63b6 S |
1222 | /* |
1223 | * smartd sends this command and the host does not handle | |
1224 | * this. So, don't send it. | |
1225 | */ | |
41098f8f | 1226 | case SET_WINDOW: |
59e00e74 | 1227 | scmnd->result = ILLEGAL_REQUEST << 16; |
41098f8f S |
1228 | allowed = false; |
1229 | break; | |
1230 | default: | |
1231 | break; | |
92ae4ebd OH |
1232 | } |
1233 | return allowed; | |
1234 | } | |
c5b463ae | 1235 | |
bab445e1 | 1236 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1237 | { |
1238 | int ret; | |
bab445e1 | 1239 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1240 | struct hv_device *dev = host_dev->dev; |
c5b463ae S |
1241 | struct hv_storvsc_request *request; |
1242 | struct storvsc_cmd_request *cmd_request; | |
1243 | unsigned int request_size = 0; | |
1244 | int i; | |
1245 | struct scatterlist *sgl; | |
1246 | unsigned int sg_count = 0; | |
1247 | struct vmscsi_request *vm_srb; | |
ce3e301c | 1248 | struct stor_mem_pools *memp = scmnd->device->hostdata; |
c5b463ae | 1249 | |
c77b63b6 | 1250 | if (!storvsc_scsi_cmd_ok(scmnd)) { |
bab445e1 | 1251 | scmnd->scsi_done(scmnd); |
92ae4ebd OH |
1252 | return 0; |
1253 | } | |
c5b463ae | 1254 | |
c5b463ae S |
1255 | request_size = sizeof(struct storvsc_cmd_request); |
1256 | ||
ce3e301c | 1257 | cmd_request = mempool_alloc(memp->request_mempool, |
c5b463ae | 1258 | GFP_ATOMIC); |
c77b63b6 S |
1259 | |
1260 | /* | |
1261 | * We might be invoked in an interrupt context; hence | |
1262 | * mempool_alloc() can fail. | |
1263 | */ | |
bab445e1 | 1264 | if (!cmd_request) |
c5b463ae | 1265 | return SCSI_MLQUEUE_DEVICE_BUSY; |
bab445e1 | 1266 | |
4e03e697 | 1267 | memset(cmd_request, 0, sizeof(struct storvsc_cmd_request)); |
c5b463ae S |
1268 | |
1269 | /* Setup the cmd request */ | |
c5b463ae S |
1270 | cmd_request->cmd = scmnd; |
1271 | ||
1272 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
1273 | ||
1274 | request = &cmd_request->request; | |
1275 | vm_srb = &request->vstor_packet.vm_srb; | |
1276 | ||
1277 | ||
1278 | /* Build the SRB */ | |
1279 | switch (scmnd->sc_data_direction) { | |
1280 | case DMA_TO_DEVICE: | |
1281 | vm_srb->data_in = WRITE_TYPE; | |
1282 | break; | |
1283 | case DMA_FROM_DEVICE: | |
1284 | vm_srb->data_in = READ_TYPE; | |
1285 | break; | |
1286 | default: | |
1287 | vm_srb->data_in = UNKNOWN_TYPE; | |
1288 | break; | |
1289 | } | |
1290 | ||
93a1bf4d | 1291 | request->cmd = cmd_request; |
c5b463ae | 1292 | |
c5b463ae S |
1293 | vm_srb->port_number = host_dev->port; |
1294 | vm_srb->path_id = scmnd->device->channel; | |
1295 | vm_srb->target_id = scmnd->device->id; | |
1296 | vm_srb->lun = scmnd->device->lun; | |
1297 | ||
c5b463ae S |
1298 | vm_srb->cdb_length = scmnd->cmd_len; |
1299 | ||
1300 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1301 | ||
1302 | request->sense_buffer = scmnd->sense_buffer; | |
1303 | ||
1304 | ||
1305 | request->data_buffer.len = scsi_bufflen(scmnd); | |
1306 | if (scsi_sg_count(scmnd)) { | |
1307 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
1308 | sg_count = scsi_sg_count(scmnd); | |
1309 | ||
1310 | /* check if we need to bounce the sgl */ | |
1311 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
1312 | cmd_request->bounce_sgl = | |
1313 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
6e8087a4 S |
1314 | scsi_bufflen(scmnd), |
1315 | vm_srb->data_in); | |
c5b463ae | 1316 | if (!cmd_request->bounce_sgl) { |
c77b63b6 S |
1317 | ret = SCSI_MLQUEUE_HOST_BUSY; |
1318 | goto queue_error; | |
c5b463ae S |
1319 | } |
1320 | ||
1321 | cmd_request->bounce_sgl_count = | |
1322 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
1323 | PAGE_SHIFT; | |
1324 | ||
fa23b8c7 S |
1325 | if (vm_srb->data_in == WRITE_TYPE) |
1326 | copy_to_bounce_buffer(sgl, | |
1327 | cmd_request->bounce_sgl, | |
1328 | scsi_sg_count(scmnd)); | |
c5b463ae S |
1329 | |
1330 | sgl = cmd_request->bounce_sgl; | |
1331 | sg_count = cmd_request->bounce_sgl_count; | |
1332 | } | |
1333 | ||
1334 | request->data_buffer.offset = sgl[0].offset; | |
1335 | ||
1336 | for (i = 0; i < sg_count; i++) | |
1337 | request->data_buffer.pfn_array[i] = | |
1338 | page_to_pfn(sg_page((&sgl[i]))); | |
1339 | ||
1340 | } else if (scsi_sglist(scmnd)) { | |
c5b463ae S |
1341 | request->data_buffer.offset = |
1342 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
1343 | request->data_buffer.pfn_array[0] = | |
1344 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
1345 | } | |
1346 | ||
c5b463ae | 1347 | /* Invokes the vsc to start an IO */ |
636f0fd1 S |
1348 | ret = storvsc_do_io(dev, &cmd_request->request); |
1349 | ||
d2598f01 | 1350 | if (ret == -EAGAIN) { |
c5b463ae S |
1351 | /* no more space */ |
1352 | ||
c77b63b6 | 1353 | if (cmd_request->bounce_sgl_count) { |
c5b463ae | 1354 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
70691ec6 | 1355 | cmd_request->bounce_sgl_count); |
c5b463ae | 1356 | |
c77b63b6 S |
1357 | ret = SCSI_MLQUEUE_DEVICE_BUSY; |
1358 | goto queue_error; | |
1359 | } | |
c5b463ae S |
1360 | } |
1361 | ||
c77b63b6 S |
1362 | return 0; |
1363 | ||
1364 | queue_error: | |
1365 | mempool_free(cmd_request, memp->request_mempool); | |
1366 | scmnd->host_scribble = NULL; | |
c5b463ae S |
1367 | return ret; |
1368 | } | |
1369 | ||
bef4a34a | 1370 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1371 | .module = THIS_MODULE, |
1372 | .name = "storvsc_host_t", | |
1373 | .bios_param = storvsc_get_chs, | |
1374 | .queuecommand = storvsc_queuecommand, | |
1375 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
1376 | .slave_alloc = storvsc_device_alloc, | |
ce3e301c | 1377 | .slave_destroy = storvsc_device_destroy, |
ff568d3a GKH |
1378 | .slave_configure = storvsc_device_configure, |
1379 | .cmd_per_lun = 1, | |
1380 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 1381 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 1382 | .this_id = -1, |
454f18a9 | 1383 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
1384 | /* currently 32 */ |
1385 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
039db52d | 1386 | .use_clustering = DISABLE_CLUSTERING, |
454f18a9 | 1387 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1388 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
1389 | }; |
1390 | ||
ef52a81b S |
1391 | enum { |
1392 | SCSI_GUID, | |
1393 | IDE_GUID, | |
1394 | }; | |
1395 | ||
d847b5fe | 1396 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 GKH |
1397 | /* SCSI guid */ |
1398 | { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, | |
ef52a81b S |
1399 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) |
1400 | .driver_data = SCSI_GUID }, | |
21e37742 S |
1401 | /* IDE guid */ |
1402 | { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, | |
ef52a81b S |
1403 | 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) |
1404 | .driver_data = IDE_GUID }, | |
c45cf2d4 | 1405 | { }, |
d847b5fe | 1406 | }; |
bef4a34a | 1407 | |
d847b5fe | 1408 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1409 | |
84946899 S |
1410 | static int storvsc_probe(struct hv_device *device, |
1411 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1412 | { |
ff568d3a | 1413 | int ret; |
bef4a34a | 1414 | struct Scsi_Host *host; |
795b613d | 1415 | struct hv_host_device *host_dev; |
ef52a81b | 1416 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
bd1f5d6a | 1417 | int target = 0; |
6e4198ce | 1418 | struct storvsc_device *stor_device; |
bd1f5d6a | 1419 | |
ff568d3a | 1420 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1421 | sizeof(struct hv_host_device)); |
f8feed06 | 1422 | if (!host) |
bef4a34a | 1423 | return -ENOMEM; |
bef4a34a | 1424 | |
7f33f30a | 1425 | host_dev = shost_priv(host); |
795b613d | 1426 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
bef4a34a | 1427 | |
795b613d | 1428 | host_dev->port = host->host_no; |
97c15296 | 1429 | host_dev->dev = device; |
bef4a34a | 1430 | |
4e03e697 | 1431 | |
a13d35ab | 1432 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1433 | if (!stor_device) { |
225ce6ea | 1434 | ret = -ENOMEM; |
ce3e301c | 1435 | goto err_out0; |
6e4198ce | 1436 | } |
9efd21e1 | 1437 | |
a13d35ab S |
1438 | stor_device->destroy = false; |
1439 | init_waitqueue_head(&stor_device->waiting_to_drain); | |
1440 | stor_device->device = device; | |
cd654ea1 S |
1441 | stor_device->host = host; |
1442 | hv_set_drvdata(device, stor_device); | |
a13d35ab | 1443 | |
6e4198ce S |
1444 | stor_device->port_number = host->host_no; |
1445 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); | |
225ce6ea | 1446 | if (ret) |
ce3e301c | 1447 | goto err_out1; |
bef4a34a | 1448 | |
6e4198ce S |
1449 | host_dev->path = stor_device->path_id; |
1450 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1451 | |
ff568d3a GKH |
1452 | /* max # of devices per target */ |
1453 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
1454 | /* max # of targets per channel */ | |
1455 | host->max_id = STORVSC_MAX_TARGETS; | |
1456 | /* max # of channels */ | |
1457 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
cf55f4a8 MS |
1458 | /* max cmd length */ |
1459 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 1460 | |
454f18a9 | 1461 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1462 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 1463 | if (ret != 0) |
ce3e301c | 1464 | goto err_out2; |
bef4a34a | 1465 | |
bd1f5d6a S |
1466 | if (!dev_is_ide) { |
1467 | scsi_scan_host(host); | |
59d22950 S |
1468 | } else { |
1469 | target = (device->dev_instance.b[5] << 8 | | |
1470 | device->dev_instance.b[4]); | |
1471 | ret = scsi_add_device(host, 0, target, 0); | |
1472 | if (ret) { | |
1473 | scsi_remove_host(host); | |
1474 | goto err_out2; | |
1475 | } | |
bef4a34a | 1476 | } |
bd1f5d6a | 1477 | return 0; |
bef4a34a | 1478 | |
ce3e301c | 1479 | err_out2: |
225ce6ea S |
1480 | /* |
1481 | * Once we have connected with the host, we would need to | |
1482 | * to invoke storvsc_dev_remove() to rollback this state and | |
1483 | * this call also frees up the stor_device; hence the jump around | |
ce3e301c | 1484 | * err_out1 label. |
225ce6ea | 1485 | */ |
bd1f5d6a | 1486 | storvsc_dev_remove(device); |
ce3e301c | 1487 | goto err_out0; |
225ce6ea S |
1488 | |
1489 | err_out1: | |
ce3e301c | 1490 | kfree(stor_device); |
225ce6ea S |
1491 | |
1492 | err_out0: | |
bd1f5d6a | 1493 | scsi_host_put(host); |
225ce6ea | 1494 | return ret; |
bef4a34a HJ |
1495 | } |
1496 | ||
ddcbf65e S |
1497 | static int storvsc_remove(struct hv_device *dev) |
1498 | { | |
1499 | struct storvsc_device *stor_device = hv_get_drvdata(dev); | |
1500 | struct Scsi_Host *host = stor_device->host; | |
1501 | ||
1502 | scsi_remove_host(host); | |
1503 | storvsc_dev_remove(dev); | |
1504 | scsi_host_put(host); | |
1505 | ||
1506 | return 0; | |
1507 | } | |
1508 | ||
40bf63ed | 1509 | static struct hv_driver storvsc_drv = { |
fafb0efc | 1510 | .name = KBUILD_MODNAME, |
d847b5fe | 1511 | .id_table = id_table, |
40bf63ed S |
1512 | .probe = storvsc_probe, |
1513 | .remove = storvsc_remove, | |
39ae6fae | 1514 | }; |
7bd05b91 | 1515 | |
d9bbae83 | 1516 | static int __init storvsc_drv_init(void) |
f5c78872 | 1517 | { |
01415ab3 S |
1518 | u32 max_outstanding_req_per_channel; |
1519 | ||
1520 | /* | |
1521 | * Divide the ring buffer data size (which is 1 page less | |
1522 | * than the ring buffer size since that page is reserved for | |
1523 | * the ring buffer indices) by the max request size (which is | |
1524 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1525 | */ | |
01415ab3 | 1526 | max_outstanding_req_per_channel = |
768fa219 GKH |
1527 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1528 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
1529 | sizeof(struct vstor_packet) + sizeof(u64), | |
1530 | sizeof(u64))); | |
f5c78872 | 1531 | |
01415ab3 | 1532 | if (max_outstanding_req_per_channel < |
f5c78872 | 1533 | STORVSC_MAX_IO_REQUESTS) |
b06efc19 | 1534 | return -EINVAL; |
f5c78872 | 1535 | |
768fa219 | 1536 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1537 | } |
1538 | ||
c63ba9e1 | 1539 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1540 | { |
768fa219 | 1541 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1542 | } |
1543 | ||
ff568d3a | 1544 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1545 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 1546 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1547 | module_init(storvsc_drv_init); |
c63ba9e1 | 1548 | module_exit(storvsc_drv_exit); |