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 | ||
f0d79fe9 S |
64 | #define VMSTOR_PROTOCOL_MAJOR(VERSION_) (((VERSION_) >> 8) & 0xff) |
65 | #define VMSTOR_PROTOCOL_MINOR(VERSION_) (((VERSION_)) & 0xff) | |
66 | #define VMSTOR_PROTOCOL_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ | |
67 | (((MINOR_) & 0xff))) | |
f0d79fe9 | 68 | |
09f0355f S |
69 | /* |
70 | * Version history: | |
71 | * V1 Beta: 0.1 | |
72 | * V1 RC < 2008/1/31: 1.0 | |
73 | * V1 RC > 2008/1/31: 2.0 | |
74 | * Win7: 4.2 | |
75 | */ | |
76 | ||
2b9525f5 | 77 | #define VMSTOR_PROTOCOL_VERSION_CURRENT VMSTOR_PROTOCOL_VERSION(4, 2) |
f0d79fe9 S |
78 | |
79 | ||
80 | ||
81 | ||
09f0355f S |
82 | /* |
83 | * This will get replaced with the max transfer length that is possible on | |
84 | * the host adapter. | |
85 | * The max transfer length will be published when we offer a vmbus channel. | |
86 | */ | |
87 | ||
f0d79fe9 S |
88 | #define MAX_TRANSFER_LENGTH 0x40000 |
89 | #define DEFAULT_PACKET_SIZE (sizeof(struct vmdata_gpa_direct) + \ | |
90 | sizeof(struct vstor_packet) + \ | |
91 | sizesizeof(u64) * (MAX_TRANSFER_LENGTH / PAGE_SIZE))) | |
92 | ||
93 | ||
94 | /* Packet structure describing virtual storage requests. */ | |
95 | enum vstor_packet_operation { | |
96 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
97 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
98 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
99 | VSTOR_OPERATION_RESET_LUN = 4, | |
100 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
101 | VSTOR_OPERATION_RESET_BUS = 6, | |
102 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
103 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
104 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
105 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
2b9525f5 S |
106 | VSTOR_OPERATION_ENUMERATE_BUS = 11, |
107 | VSTOR_OPERATION_MAXIMUM = 11 | |
f0d79fe9 S |
108 | }; |
109 | ||
110 | /* | |
111 | * Platform neutral description of a scsi request - | |
112 | * this remains the same across the write regardless of 32/64 bit | |
113 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
114 | */ | |
115 | #define CDB16GENERIC_LENGTH 0x10 | |
116 | ||
117 | #ifndef SENSE_BUFFER_SIZE | |
118 | #define SENSE_BUFFER_SIZE 0x12 | |
119 | #endif | |
120 | ||
121 | #define MAX_DATA_BUF_LEN_WITH_PADDING 0x14 | |
122 | ||
123 | struct vmscsi_request { | |
c649114a S |
124 | u16 length; |
125 | u8 srb_status; | |
126 | u8 scsi_status; | |
f0d79fe9 | 127 | |
c649114a S |
128 | u8 port_number; |
129 | u8 path_id; | |
130 | u8 target_id; | |
131 | u8 lun; | |
f0d79fe9 | 132 | |
c649114a S |
133 | u8 cdb_length; |
134 | u8 sense_info_length; | |
135 | u8 data_in; | |
136 | u8 reserved; | |
f0d79fe9 | 137 | |
c649114a | 138 | u32 data_transfer_length; |
f0d79fe9 S |
139 | |
140 | union { | |
c649114a S |
141 | u8 cdb[CDB16GENERIC_LENGTH]; |
142 | u8 sense_data[SENSE_BUFFER_SIZE]; | |
143 | u8 reserved_array[MAX_DATA_BUF_LEN_WITH_PADDING]; | |
f0d79fe9 S |
144 | }; |
145 | } __attribute((packed)); | |
146 | ||
147 | ||
148 | /* | |
149 | * This structure is sent during the intialization phase to get the different | |
150 | * properties of the channel. | |
151 | */ | |
152 | struct vmstorage_channel_properties { | |
c649114a S |
153 | u16 protocol_version; |
154 | u8 path_id; | |
155 | u8 target_id; | |
f0d79fe9 S |
156 | |
157 | /* Note: port number is only really known on the client side */ | |
c649114a S |
158 | u32 port_number; |
159 | u32 flags; | |
160 | u32 max_transfer_bytes; | |
f0d79fe9 | 161 | |
c649114a S |
162 | /* |
163 | * This id is unique for each channel and will correspond with | |
164 | * vendor specific data in the inquiry data. | |
165 | */ | |
166 | ||
167 | u64 unique_id; | |
f0d79fe9 S |
168 | } __packed; |
169 | ||
170 | /* This structure is sent during the storage protocol negotiations. */ | |
171 | struct vmstorage_protocol_version { | |
172 | /* Major (MSW) and minor (LSW) version numbers. */ | |
173 | unsigned short major_minor; | |
174 | ||
175 | /* | |
176 | * Revision number is auto-incremented whenever this file is changed | |
177 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
178 | * definitely indicate incompatibility--but it does indicate mismatched | |
179 | * builds. | |
c649114a | 180 | * This is only used on the windows side. Just set it to 0. |
f0d79fe9 S |
181 | */ |
182 | unsigned short revision; | |
183 | } __packed; | |
184 | ||
185 | /* Channel Property Flags */ | |
186 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
187 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
188 | ||
189 | struct vstor_packet { | |
190 | /* Requested operation type */ | |
191 | enum vstor_packet_operation operation; | |
192 | ||
193 | /* Flags - see below for values */ | |
c649114a | 194 | u32 flags; |
f0d79fe9 S |
195 | |
196 | /* Status of the request returned from the server side. */ | |
c649114a | 197 | u32 status; |
f0d79fe9 S |
198 | |
199 | /* Data payload area */ | |
200 | union { | |
201 | /* | |
202 | * Structure used to forward SCSI commands from the | |
203 | * client to the server. | |
204 | */ | |
205 | struct vmscsi_request vm_srb; | |
206 | ||
207 | /* Structure used to query channel properties. */ | |
208 | struct vmstorage_channel_properties storage_channel_properties; | |
209 | ||
210 | /* Used during version negotiations. */ | |
211 | struct vmstorage_protocol_version version; | |
212 | }; | |
213 | } __packed; | |
214 | ||
f0d79fe9 | 215 | /* |
09f0355f S |
216 | * Packet Flags: |
217 | * | |
f0d79fe9 S |
218 | * This flag indicates that the server should send back a completion for this |
219 | * packet. | |
220 | */ | |
09f0355f | 221 | |
f0d79fe9 S |
222 | #define REQUEST_COMPLETION_FLAG 0x1 |
223 | ||
f0d79fe9 S |
224 | #define STORVSC_MAX_IO_REQUESTS 128 |
225 | ||
226 | /* | |
227 | * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In | |
228 | * reality, the path/target is not used (ie always set to 0) so our | |
229 | * scsi host adapter essentially has 1 bus with 1 target that contains | |
230 | * up to 256 luns. | |
231 | */ | |
232 | #define STORVSC_MAX_LUNS_PER_TARGET 64 | |
233 | #define STORVSC_MAX_TARGETS 1 | |
234 | #define STORVSC_MAX_CHANNELS 1 | |
cf55f4a8 | 235 | #define STORVSC_MAX_CMD_LEN 16 |
f0d79fe9 | 236 | |
f0d79fe9 S |
237 | /* Matches Windows-end */ |
238 | enum storvsc_request_type { | |
c649114a | 239 | WRITE_TYPE = 0, |
f0d79fe9 S |
240 | READ_TYPE, |
241 | UNKNOWN_TYPE, | |
242 | }; | |
243 | ||
16046320 S |
244 | /* |
245 | * SRB status codes and masks; a subset of the codes used here. | |
246 | */ | |
247 | ||
248 | #define SRB_STATUS_AUTOSENSE_VALID 0x80 | |
249 | #define SRB_STATUS_INVALID_LUN 0x20 | |
250 | #define SRB_STATUS_SUCCESS 0x01 | |
251 | #define SRB_STATUS_ERROR 0x04 | |
252 | ||
253 | ||
f0d79fe9 S |
254 | |
255 | struct hv_storvsc_request { | |
f0d79fe9 S |
256 | struct hv_device *device; |
257 | ||
258 | /* Synchronize the request/response if needed */ | |
259 | struct completion wait_event; | |
260 | ||
261 | unsigned char *sense_buffer; | |
93a1bf4d | 262 | struct storvsc_cmd_request *cmd; |
f0d79fe9 S |
263 | struct hv_multipage_buffer data_buffer; |
264 | ||
265 | struct vstor_packet vstor_packet; | |
266 | }; | |
267 | ||
268 | ||
f0d79fe9 S |
269 | /* A storvsc device is a device object that contains a vmbus channel */ |
270 | struct storvsc_device { | |
271 | struct hv_device *device; | |
272 | ||
273 | bool destroy; | |
274 | bool drain_notify; | |
275 | atomic_t num_outstanding_req; | |
cd654ea1 | 276 | struct Scsi_Host *host; |
f0d79fe9 S |
277 | |
278 | wait_queue_head_t waiting_to_drain; | |
279 | ||
280 | /* | |
281 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
282 | * controller. In reality, the pathid, targetid is always 0 | |
283 | * and the port is set by us | |
284 | */ | |
285 | unsigned int port_number; | |
286 | unsigned char path_id; | |
287 | unsigned char target_id; | |
288 | ||
289 | /* Used for vsc/vsp channel reset process */ | |
290 | struct hv_storvsc_request init_request; | |
291 | struct hv_storvsc_request reset_request; | |
292 | }; | |
293 | ||
ce3e301c | 294 | struct stor_mem_pools { |
c1b3d067 | 295 | struct kmem_cache *request_pool; |
4e03e697 | 296 | mempool_t *request_mempool; |
ce3e301c S |
297 | }; |
298 | ||
299 | struct hv_host_device { | |
300 | struct hv_device *dev; | |
c1b3d067 S |
301 | unsigned int port; |
302 | unsigned char path; | |
303 | unsigned char target; | |
304 | }; | |
305 | ||
306 | struct storvsc_cmd_request { | |
307 | struct list_head entry; | |
308 | struct scsi_cmnd *cmd; | |
309 | ||
310 | unsigned int bounce_sgl_count; | |
311 | struct scatterlist *bounce_sgl; | |
312 | ||
313 | struct hv_storvsc_request request; | |
314 | }; | |
f0d79fe9 | 315 | |
12675799 S |
316 | struct storvsc_scan_work { |
317 | struct work_struct work; | |
318 | struct Scsi_Host *host; | |
319 | uint lun; | |
320 | }; | |
321 | ||
322 | static void storvsc_bus_scan(struct work_struct *work) | |
323 | { | |
324 | struct storvsc_scan_work *wrk; | |
325 | int id, order_id; | |
326 | ||
327 | wrk = container_of(work, struct storvsc_scan_work, work); | |
328 | for (id = 0; id < wrk->host->max_id; ++id) { | |
329 | if (wrk->host->reverse_ordering) | |
330 | order_id = wrk->host->max_id - id - 1; | |
331 | else | |
332 | order_id = id; | |
333 | ||
334 | scsi_scan_target(&wrk->host->shost_gendev, 0, | |
335 | order_id, SCAN_WILD_CARD, 1); | |
336 | } | |
337 | kfree(wrk); | |
338 | } | |
339 | ||
b4017319 S |
340 | static void storvsc_remove_lun(struct work_struct *work) |
341 | { | |
342 | struct storvsc_scan_work *wrk; | |
343 | struct scsi_device *sdev; | |
344 | ||
345 | wrk = container_of(work, struct storvsc_scan_work, work); | |
346 | if (!scsi_host_get(wrk->host)) | |
347 | goto done; | |
348 | ||
349 | sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); | |
350 | ||
351 | if (sdev) { | |
352 | scsi_remove_device(sdev); | |
353 | scsi_device_put(sdev); | |
354 | } | |
355 | scsi_host_put(wrk->host); | |
356 | ||
357 | done: | |
358 | kfree(wrk); | |
359 | } | |
360 | ||
a8c18c57 S |
361 | /* |
362 | * We can get incoming messages from the host that are not in response to | |
363 | * messages that we have sent out. An example of this would be messages | |
364 | * received by the guest to notify dynamic addition/removal of LUNs. To | |
365 | * deal with potential race conditions where the driver may be in the | |
366 | * midst of being unloaded when we might receive an unsolicited message | |
367 | * from the host, we have implemented a mechanism to gurantee sequential | |
368 | * consistency: | |
369 | * | |
370 | * 1) Once the device is marked as being destroyed, we will fail all | |
371 | * outgoing messages. | |
372 | * 2) We permit incoming messages when the device is being destroyed, | |
373 | * only to properly account for messages already sent out. | |
374 | */ | |
375 | ||
f0d79fe9 S |
376 | static inline struct storvsc_device *get_out_stor_device( |
377 | struct hv_device *device) | |
378 | { | |
379 | struct storvsc_device *stor_device; | |
380 | ||
cd654ea1 | 381 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
382 | |
383 | if (stor_device && stor_device->destroy) | |
384 | stor_device = NULL; | |
385 | ||
386 | return stor_device; | |
387 | } | |
388 | ||
389 | ||
390 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
391 | { | |
392 | dev->drain_notify = true; | |
393 | wait_event(dev->waiting_to_drain, | |
394 | atomic_read(&dev->num_outstanding_req) == 0); | |
395 | dev->drain_notify = false; | |
396 | } | |
bef4a34a | 397 | |
8dcf37d4 S |
398 | static inline struct storvsc_device *get_in_stor_device( |
399 | struct hv_device *device) | |
400 | { | |
401 | struct storvsc_device *stor_device; | |
8dcf37d4 | 402 | |
cd654ea1 | 403 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
404 | |
405 | if (!stor_device) | |
406 | goto get_in_err; | |
407 | ||
408 | /* | |
409 | * If the device is being destroyed; allow incoming | |
410 | * traffic only to cleanup outstanding requests. | |
411 | */ | |
412 | ||
413 | if (stor_device->destroy && | |
414 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
415 | stor_device = NULL; | |
416 | ||
417 | get_in_err: | |
8dcf37d4 S |
418 | return stor_device; |
419 | ||
420 | } | |
421 | ||
2707388c S |
422 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
423 | unsigned int sg_count) | |
424 | { | |
425 | int i; | |
426 | struct page *page_buf; | |
427 | ||
428 | for (i = 0; i < sg_count; i++) { | |
429 | page_buf = sg_page((&sgl[i])); | |
430 | if (page_buf != NULL) | |
431 | __free_page(page_buf); | |
432 | } | |
433 | ||
434 | kfree(sgl); | |
435 | } | |
436 | ||
437 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
438 | { | |
439 | int i; | |
440 | ||
441 | /* No need to check */ | |
442 | if (sg_count < 2) | |
443 | return -1; | |
444 | ||
445 | /* We have at least 2 sg entries */ | |
446 | for (i = 0; i < sg_count; i++) { | |
447 | if (i == 0) { | |
448 | /* make sure 1st one does not have hole */ | |
449 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
450 | return i; | |
451 | } else if (i == sg_count - 1) { | |
452 | /* make sure last one does not have hole */ | |
453 | if (sgl[i].offset != 0) | |
454 | return i; | |
455 | } else { | |
456 | /* make sure no hole in the middle */ | |
457 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
458 | return i; | |
459 | } | |
460 | } | |
461 | return -1; | |
462 | } | |
463 | ||
464 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, | |
465 | unsigned int sg_count, | |
466 | unsigned int len, | |
467 | int write) | |
468 | { | |
469 | int i; | |
470 | int num_pages; | |
471 | struct scatterlist *bounce_sgl; | |
472 | struct page *page_buf; | |
473 | unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE); | |
474 | ||
475 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
476 | ||
477 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
478 | if (!bounce_sgl) | |
479 | return NULL; | |
480 | ||
481 | for (i = 0; i < num_pages; i++) { | |
482 | page_buf = alloc_page(GFP_ATOMIC); | |
483 | if (!page_buf) | |
484 | goto cleanup; | |
485 | sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0); | |
486 | } | |
487 | ||
488 | return bounce_sgl; | |
489 | ||
490 | cleanup: | |
491 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
492 | return NULL; | |
493 | } | |
494 | ||
495 | /* Assume the original sgl has enough room */ | |
496 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
497 | struct scatterlist *bounce_sgl, | |
498 | unsigned int orig_sgl_count, | |
499 | unsigned int bounce_sgl_count) | |
500 | { | |
501 | int i; | |
502 | int j = 0; | |
503 | unsigned long src, dest; | |
504 | unsigned int srclen, destlen, copylen; | |
505 | unsigned int total_copied = 0; | |
506 | unsigned long bounce_addr = 0; | |
507 | unsigned long dest_addr = 0; | |
508 | unsigned long flags; | |
509 | ||
510 | local_irq_save(flags); | |
511 | ||
512 | for (i = 0; i < orig_sgl_count; i++) { | |
513 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
514 | KM_IRQ0) + orig_sgl[i].offset; | |
515 | dest = dest_addr; | |
516 | destlen = orig_sgl[i].length; | |
517 | ||
518 | if (bounce_addr == 0) | |
519 | bounce_addr = | |
520 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
521 | KM_IRQ0); | |
522 | ||
523 | while (destlen) { | |
524 | src = bounce_addr + bounce_sgl[j].offset; | |
525 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
526 | ||
527 | copylen = min(srclen, destlen); | |
528 | memcpy((void *)dest, (void *)src, copylen); | |
529 | ||
530 | total_copied += copylen; | |
531 | bounce_sgl[j].offset += copylen; | |
532 | destlen -= copylen; | |
533 | dest += copylen; | |
534 | ||
535 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
536 | /* full */ | |
537 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
538 | j++; | |
539 | ||
540 | /* | |
541 | * It is possible that the number of elements | |
542 | * in the bounce buffer may not be equal to | |
543 | * the number of elements in the original | |
544 | * scatter list. Handle this correctly. | |
545 | */ | |
546 | ||
547 | if (j == bounce_sgl_count) { | |
548 | /* | |
549 | * We are done; cleanup and return. | |
550 | */ | |
551 | kunmap_atomic((void *)(dest_addr - | |
552 | orig_sgl[i].offset), | |
553 | KM_IRQ0); | |
554 | local_irq_restore(flags); | |
555 | return total_copied; | |
556 | } | |
557 | ||
558 | /* if we need to use another bounce buffer */ | |
559 | if (destlen || i != orig_sgl_count - 1) | |
560 | bounce_addr = | |
561 | (unsigned long)kmap_atomic( | |
562 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
563 | } else if (destlen == 0 && i == orig_sgl_count - 1) { | |
564 | /* unmap the last bounce that is < PAGE_SIZE */ | |
565 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
566 | } | |
567 | } | |
568 | ||
569 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), | |
570 | KM_IRQ0); | |
571 | } | |
572 | ||
573 | local_irq_restore(flags); | |
574 | ||
575 | return total_copied; | |
576 | } | |
577 | ||
578 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
579 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
580 | struct scatterlist *bounce_sgl, | |
581 | unsigned int orig_sgl_count) | |
582 | { | |
583 | int i; | |
584 | int j = 0; | |
585 | unsigned long src, dest; | |
586 | unsigned int srclen, destlen, copylen; | |
587 | unsigned int total_copied = 0; | |
588 | unsigned long bounce_addr = 0; | |
589 | unsigned long src_addr = 0; | |
590 | unsigned long flags; | |
591 | ||
592 | local_irq_save(flags); | |
593 | ||
594 | for (i = 0; i < orig_sgl_count; i++) { | |
595 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
596 | KM_IRQ0) + orig_sgl[i].offset; | |
597 | src = src_addr; | |
598 | srclen = orig_sgl[i].length; | |
599 | ||
600 | if (bounce_addr == 0) | |
601 | bounce_addr = | |
602 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
603 | KM_IRQ0); | |
604 | ||
605 | while (srclen) { | |
606 | /* assume bounce offset always == 0 */ | |
607 | dest = bounce_addr + bounce_sgl[j].length; | |
608 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
609 | ||
610 | copylen = min(srclen, destlen); | |
611 | memcpy((void *)dest, (void *)src, copylen); | |
612 | ||
613 | total_copied += copylen; | |
614 | bounce_sgl[j].length += copylen; | |
615 | srclen -= copylen; | |
616 | src += copylen; | |
617 | ||
618 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
619 | /* full..move to next entry */ | |
620 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
621 | j++; | |
622 | ||
623 | /* if we need to use another bounce buffer */ | |
624 | if (srclen || i != orig_sgl_count - 1) | |
625 | bounce_addr = | |
626 | (unsigned long)kmap_atomic( | |
627 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
628 | ||
629 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
630 | /* unmap the last bounce that is < PAGE_SIZE */ | |
631 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
632 | } | |
633 | } | |
634 | ||
635 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
636 | } | |
637 | ||
638 | local_irq_restore(flags); | |
639 | ||
640 | return total_copied; | |
641 | } | |
642 | ||
8dcf37d4 S |
643 | static int storvsc_channel_init(struct hv_device *device) |
644 | { | |
645 | struct storvsc_device *stor_device; | |
646 | struct hv_storvsc_request *request; | |
647 | struct vstor_packet *vstor_packet; | |
648 | int ret, t; | |
649 | ||
650 | stor_device = get_out_stor_device(device); | |
651 | if (!stor_device) | |
652 | return -ENODEV; | |
653 | ||
654 | request = &stor_device->init_request; | |
655 | vstor_packet = &request->vstor_packet; | |
656 | ||
657 | /* | |
658 | * Now, initiate the vsc/vsp initialization protocol on the open | |
659 | * channel | |
660 | */ | |
661 | memset(request, 0, sizeof(struct hv_storvsc_request)); | |
662 | init_completion(&request->wait_event); | |
663 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
664 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
665 | ||
666 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
667 | sizeof(struct vstor_packet), | |
668 | (unsigned long)request, | |
669 | VM_PKT_DATA_INBAND, | |
670 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
671 | if (ret != 0) | |
672 | goto cleanup; | |
673 | ||
674 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
675 | if (t == 0) { | |
676 | ret = -ETIMEDOUT; | |
677 | goto cleanup; | |
678 | } | |
679 | ||
680 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
681 | vstor_packet->status != 0) | |
682 | goto cleanup; | |
683 | ||
684 | ||
685 | /* reuse the packet for version range supported */ | |
686 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
687 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
688 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
689 | ||
690 | vstor_packet->version.major_minor = VMSTOR_PROTOCOL_VERSION_CURRENT; | |
c649114a | 691 | vstor_packet->version.revision = 0; |
8dcf37d4 S |
692 | |
693 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
694 | sizeof(struct vstor_packet), | |
695 | (unsigned long)request, | |
696 | VM_PKT_DATA_INBAND, | |
697 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
698 | if (ret != 0) | |
699 | goto cleanup; | |
700 | ||
701 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
702 | if (t == 0) { | |
703 | ret = -ETIMEDOUT; | |
704 | goto cleanup; | |
705 | } | |
706 | ||
707 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
708 | vstor_packet->status != 0) | |
709 | goto cleanup; | |
710 | ||
711 | ||
712 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
713 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
714 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
715 | vstor_packet->storage_channel_properties.port_number = | |
716 | stor_device->port_number; | |
717 | ||
718 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
719 | sizeof(struct vstor_packet), | |
720 | (unsigned long)request, | |
721 | VM_PKT_DATA_INBAND, | |
722 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
723 | ||
724 | if (ret != 0) | |
725 | goto cleanup; | |
726 | ||
727 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
728 | if (t == 0) { | |
729 | ret = -ETIMEDOUT; | |
730 | goto cleanup; | |
731 | } | |
732 | ||
733 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
734 | vstor_packet->status != 0) | |
735 | goto cleanup; | |
736 | ||
737 | stor_device->path_id = vstor_packet->storage_channel_properties.path_id; | |
738 | stor_device->target_id | |
739 | = vstor_packet->storage_channel_properties.target_id; | |
740 | ||
741 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
742 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
743 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
744 | ||
745 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
746 | sizeof(struct vstor_packet), | |
747 | (unsigned long)request, | |
748 | VM_PKT_DATA_INBAND, | |
749 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
750 | ||
751 | if (ret != 0) | |
752 | goto cleanup; | |
753 | ||
754 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
755 | if (t == 0) { | |
756 | ret = -ETIMEDOUT; | |
757 | goto cleanup; | |
758 | } | |
759 | ||
760 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
761 | vstor_packet->status != 0) | |
762 | goto cleanup; | |
763 | ||
764 | ||
765 | cleanup: | |
766 | return ret; | |
767 | } | |
768 | ||
2707388c S |
769 | |
770 | static void storvsc_command_completion(struct hv_storvsc_request *request) | |
8dcf37d4 | 771 | { |
93a1bf4d | 772 | struct storvsc_cmd_request *cmd_request = request->cmd; |
2707388c S |
773 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
774 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); | |
775 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
776 | struct scsi_sense_hdr sense_hdr; | |
777 | struct vmscsi_request *vm_srb; | |
778 | struct storvsc_scan_work *wrk; | |
779 | struct stor_mem_pools *memp = scmnd->device->hostdata; | |
8dcf37d4 | 780 | |
2707388c S |
781 | vm_srb = &request->vstor_packet.vm_srb; |
782 | if (cmd_request->bounce_sgl_count) { | |
783 | if (vm_srb->data_in == READ_TYPE) | |
784 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
785 | cmd_request->bounce_sgl, | |
786 | scsi_sg_count(scmnd), | |
787 | cmd_request->bounce_sgl_count); | |
788 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
789 | cmd_request->bounce_sgl_count); | |
790 | } | |
8dcf37d4 | 791 | |
4ed51a21 | 792 | /* |
2707388c S |
793 | * If there is an error; offline the device since all |
794 | * error recovery strategies would have already been | |
795 | * deployed on the host side. | |
796 | */ | |
797 | if (vm_srb->srb_status == SRB_STATUS_ERROR) | |
798 | scmnd->result = DID_TARGET_FAILURE << 16; | |
799 | else | |
800 | scmnd->result = vm_srb->scsi_status; | |
801 | ||
802 | /* | |
803 | * If the LUN is invalid; remove the device. | |
804 | */ | |
805 | if (vm_srb->srb_status == SRB_STATUS_INVALID_LUN) { | |
806 | struct storvsc_device *stor_dev; | |
807 | struct hv_device *dev = host_dev->dev; | |
808 | struct Scsi_Host *host; | |
809 | ||
810 | stor_dev = get_in_stor_device(dev); | |
811 | host = stor_dev->host; | |
812 | ||
813 | wrk = kmalloc(sizeof(struct storvsc_scan_work), | |
814 | GFP_ATOMIC); | |
815 | if (!wrk) { | |
816 | scmnd->result = DID_TARGET_FAILURE << 16; | |
817 | } else { | |
818 | wrk->host = host; | |
819 | wrk->lun = vm_srb->lun; | |
820 | INIT_WORK(&wrk->work, storvsc_remove_lun); | |
821 | schedule_work(&wrk->work); | |
822 | } | |
823 | } | |
824 | ||
825 | if (scmnd->result) { | |
826 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
827 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
828 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
829 | } | |
830 | ||
831 | scsi_set_resid(scmnd, | |
832 | request->data_buffer.len - | |
833 | vm_srb->data_transfer_length); | |
834 | ||
835 | scsi_done_fn = scmnd->scsi_done; | |
836 | ||
837 | scmnd->host_scribble = NULL; | |
838 | scmnd->scsi_done = NULL; | |
839 | ||
840 | scsi_done_fn(scmnd); | |
841 | ||
842 | mempool_free(cmd_request, memp->request_mempool); | |
843 | } | |
844 | ||
845 | static void storvsc_on_io_completion(struct hv_device *device, | |
846 | struct vstor_packet *vstor_packet, | |
847 | struct hv_storvsc_request *request) | |
848 | { | |
849 | struct storvsc_device *stor_device; | |
850 | struct vstor_packet *stor_pkt; | |
851 | ||
852 | stor_device = hv_get_drvdata(device); | |
853 | stor_pkt = &request->vstor_packet; | |
854 | ||
855 | /* | |
856 | * The current SCSI handling on the host side does | |
857 | * not correctly handle: | |
858 | * INQUIRY command with page code parameter set to 0x80 | |
859 | * MODE_SENSE command with cmd[2] == 0x1c | |
860 | * | |
861 | * Setup srb and scsi status so this won't be fatal. | |
862 | * We do this so we can distinguish truly fatal failues | |
4ed51a21 S |
863 | * (srb status == 0x4) and off-line the device in that case. |
864 | */ | |
865 | ||
866 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
a8c18c57 | 867 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
4ed51a21 | 868 | vstor_packet->vm_srb.scsi_status = 0; |
16046320 | 869 | vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
4ed51a21 S |
870 | } |
871 | ||
8dcf37d4 S |
872 | |
873 | /* Copy over the status...etc */ | |
874 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
875 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
876 | stor_pkt->vm_srb.sense_info_length = | |
877 | vstor_packet->vm_srb.sense_info_length; | |
878 | ||
879 | if (vstor_packet->vm_srb.scsi_status != 0 || | |
16046320 | 880 | vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){ |
d181daa0 GKH |
881 | dev_warn(&device->device, |
882 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
883 | stor_pkt->vm_srb.cdb[0], | |
884 | vstor_packet->vm_srb.scsi_status, | |
885 | vstor_packet->vm_srb.srb_status); | |
8dcf37d4 S |
886 | } |
887 | ||
888 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
889 | /* CHECK_CONDITION */ | |
16046320 S |
890 | if (vstor_packet->vm_srb.srb_status & |
891 | SRB_STATUS_AUTOSENSE_VALID) { | |
8dcf37d4 | 892 | /* autosense data available */ |
d181daa0 | 893 | dev_warn(&device->device, |
41098f8f S |
894 | "stor pkt %p autosense data valid - len %d\n", |
895 | request, | |
896 | vstor_packet->vm_srb.sense_info_length); | |
8dcf37d4 S |
897 | |
898 | memcpy(request->sense_buffer, | |
899 | vstor_packet->vm_srb.sense_data, | |
900 | vstor_packet->vm_srb.sense_info_length); | |
901 | ||
902 | } | |
903 | } | |
904 | ||
905 | stor_pkt->vm_srb.data_transfer_length = | |
906 | vstor_packet->vm_srb.data_transfer_length; | |
907 | ||
2707388c | 908 | storvsc_command_completion(request); |
8dcf37d4 S |
909 | |
910 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
911 | stor_device->drain_notify) | |
912 | wake_up(&stor_device->waiting_to_drain); | |
913 | ||
914 | ||
915 | } | |
916 | ||
917 | static void storvsc_on_receive(struct hv_device *device, | |
918 | struct vstor_packet *vstor_packet, | |
919 | struct hv_storvsc_request *request) | |
920 | { | |
12675799 S |
921 | struct storvsc_scan_work *work; |
922 | struct storvsc_device *stor_device; | |
923 | ||
8dcf37d4 S |
924 | switch (vstor_packet->operation) { |
925 | case VSTOR_OPERATION_COMPLETE_IO: | |
926 | storvsc_on_io_completion(device, vstor_packet, request); | |
927 | break; | |
12675799 | 928 | |
8dcf37d4 | 929 | case VSTOR_OPERATION_REMOVE_DEVICE: |
12675799 S |
930 | case VSTOR_OPERATION_ENUMERATE_BUS: |
931 | stor_device = get_in_stor_device(device); | |
932 | work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
933 | if (!work) | |
934 | return; | |
935 | ||
936 | INIT_WORK(&work->work, storvsc_bus_scan); | |
937 | work->host = stor_device->host; | |
938 | schedule_work(&work->work); | |
939 | break; | |
8dcf37d4 S |
940 | |
941 | default: | |
942 | break; | |
943 | } | |
944 | } | |
945 | ||
946 | static void storvsc_on_channel_callback(void *context) | |
947 | { | |
948 | struct hv_device *device = (struct hv_device *)context; | |
949 | struct storvsc_device *stor_device; | |
950 | u32 bytes_recvd; | |
951 | u64 request_id; | |
952 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
953 | struct hv_storvsc_request *request; | |
954 | int ret; | |
955 | ||
956 | ||
957 | stor_device = get_in_stor_device(device); | |
958 | if (!stor_device) | |
959 | return; | |
960 | ||
961 | do { | |
962 | ret = vmbus_recvpacket(device->channel, packet, | |
963 | ALIGN(sizeof(struct vstor_packet), 8), | |
964 | &bytes_recvd, &request_id); | |
965 | if (ret == 0 && bytes_recvd > 0) { | |
966 | ||
967 | request = (struct hv_storvsc_request *) | |
968 | (unsigned long)request_id; | |
969 | ||
970 | if ((request == &stor_device->init_request) || | |
971 | (request == &stor_device->reset_request)) { | |
972 | ||
973 | memcpy(&request->vstor_packet, packet, | |
974 | sizeof(struct vstor_packet)); | |
975 | complete(&request->wait_event); | |
976 | } else { | |
977 | storvsc_on_receive(device, | |
978 | (struct vstor_packet *)packet, | |
979 | request); | |
980 | } | |
981 | } else { | |
982 | break; | |
983 | } | |
984 | } while (1); | |
985 | ||
986 | return; | |
987 | } | |
988 | ||
989 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
990 | { | |
991 | struct vmstorage_channel_properties props; | |
992 | int ret; | |
993 | ||
994 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
995 | ||
8dcf37d4 S |
996 | ret = vmbus_open(device->channel, |
997 | ring_size, | |
998 | ring_size, | |
999 | (void *)&props, | |
1000 | sizeof(struct vmstorage_channel_properties), | |
1001 | storvsc_on_channel_callback, device); | |
1002 | ||
1003 | if (ret != 0) | |
1004 | return ret; | |
1005 | ||
1006 | ret = storvsc_channel_init(device); | |
1007 | ||
1008 | return ret; | |
1009 | } | |
1010 | ||
c1b3d067 | 1011 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
1012 | { |
1013 | struct storvsc_device *stor_device; | |
1014 | unsigned long flags; | |
1015 | ||
cd654ea1 | 1016 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
1017 | |
1018 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
1019 | stor_device->destroy = true; | |
1020 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
1021 | ||
1022 | /* | |
1023 | * At this point, all outbound traffic should be disable. We | |
1024 | * only allow inbound traffic (responses) to proceed so that | |
1025 | * outstanding requests can be completed. | |
1026 | */ | |
1027 | ||
1028 | storvsc_wait_to_drain(stor_device); | |
1029 | ||
1030 | /* | |
1031 | * Since we have already drained, we don't need to busy wait | |
1032 | * as was done in final_release_stor_device() | |
1033 | * Note that we cannot set the ext pointer to NULL until | |
1034 | * we have drained - to drain the outgoing packets, we need to | |
1035 | * allow incoming packets. | |
1036 | */ | |
1037 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
cd654ea1 | 1038 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
1039 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
1040 | ||
1041 | /* Close the channel */ | |
1042 | vmbus_close(device->channel); | |
1043 | ||
1044 | kfree(stor_device); | |
1045 | return 0; | |
1046 | } | |
1047 | ||
c1b3d067 | 1048 | static int storvsc_do_io(struct hv_device *device, |
8dcf37d4 S |
1049 | struct hv_storvsc_request *request) |
1050 | { | |
1051 | struct storvsc_device *stor_device; | |
1052 | struct vstor_packet *vstor_packet; | |
1053 | int ret = 0; | |
1054 | ||
1055 | vstor_packet = &request->vstor_packet; | |
1056 | stor_device = get_out_stor_device(device); | |
1057 | ||
1058 | if (!stor_device) | |
1059 | return -ENODEV; | |
1060 | ||
1061 | ||
1062 | request->device = device; | |
1063 | ||
1064 | ||
1065 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
1066 | ||
1067 | vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); | |
1068 | ||
1069 | ||
1070 | vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE; | |
1071 | ||
1072 | ||
1073 | vstor_packet->vm_srb.data_transfer_length = | |
1074 | request->data_buffer.len; | |
1075 | ||
1076 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
1077 | ||
1078 | if (request->data_buffer.len) { | |
1079 | ret = vmbus_sendpacket_multipagebuffer(device->channel, | |
1080 | &request->data_buffer, | |
1081 | vstor_packet, | |
1082 | sizeof(struct vstor_packet), | |
1083 | (unsigned long)request); | |
1084 | } else { | |
1085 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
1086 | sizeof(struct vstor_packet), | |
1087 | (unsigned long)request, | |
1088 | VM_PKT_DATA_INBAND, | |
1089 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1090 | } | |
1091 | ||
1092 | if (ret != 0) | |
1093 | return ret; | |
1094 | ||
1095 | atomic_inc(&stor_device->num_outstanding_req); | |
1096 | ||
1097 | return ret; | |
1098 | } | |
1099 | ||
5b60acee S |
1100 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
1101 | { | |
ce3e301c S |
1102 | struct stor_mem_pools *memp; |
1103 | int number = STORVSC_MIN_BUF_NR; | |
1104 | ||
1105 | memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL); | |
1106 | if (!memp) | |
1107 | return -ENOMEM; | |
1108 | ||
1109 | memp->request_pool = | |
1110 | kmem_cache_create(dev_name(&sdevice->sdev_dev), | |
1111 | sizeof(struct storvsc_cmd_request), 0, | |
1112 | SLAB_HWCACHE_ALIGN, NULL); | |
1113 | ||
1114 | if (!memp->request_pool) | |
1115 | goto err0; | |
1116 | ||
1117 | memp->request_mempool = mempool_create(number, mempool_alloc_slab, | |
1118 | mempool_free_slab, | |
1119 | memp->request_pool); | |
1120 | ||
1121 | if (!memp->request_mempool) | |
1122 | goto err1; | |
1123 | ||
1124 | sdevice->hostdata = memp; | |
1125 | ||
5b60acee | 1126 | return 0; |
ce3e301c S |
1127 | |
1128 | err1: | |
1129 | kmem_cache_destroy(memp->request_pool); | |
1130 | ||
1131 | err0: | |
1132 | kfree(memp); | |
1133 | return -ENOMEM; | |
1134 | } | |
1135 | ||
1136 | static void storvsc_device_destroy(struct scsi_device *sdevice) | |
1137 | { | |
1138 | struct stor_mem_pools *memp = sdevice->hostdata; | |
1139 | ||
1140 | mempool_destroy(memp->request_mempool); | |
1141 | kmem_cache_destroy(memp->request_pool); | |
1142 | kfree(memp); | |
1143 | sdevice->hostdata = NULL; | |
5b60acee S |
1144 | } |
1145 | ||
419f2d03 S |
1146 | static int storvsc_device_configure(struct scsi_device *sdevice) |
1147 | { | |
1148 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
1149 | STORVSC_MAX_IO_REQUESTS); | |
1150 | ||
419f2d03 S |
1151 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
1152 | ||
419f2d03 | 1153 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); |
419f2d03 S |
1154 | |
1155 | return 0; | |
1156 | } | |
1157 | ||
62838ce2 S |
1158 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
1159 | sector_t capacity, int *info) | |
1160 | { | |
5326fd5c S |
1161 | sector_t nsect = capacity; |
1162 | sector_t cylinders = nsect; | |
1163 | int heads, sectors_pt; | |
62838ce2 | 1164 | |
5326fd5c S |
1165 | /* |
1166 | * We are making up these values; let us keep it simple. | |
1167 | */ | |
1168 | heads = 0xff; | |
1169 | sectors_pt = 0x3f; /* Sectors per track */ | |
1170 | sector_div(cylinders, heads * sectors_pt); | |
1171 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1172 | cylinders = 0xffff; | |
62838ce2 S |
1173 | |
1174 | info[0] = heads; | |
5326fd5c S |
1175 | info[1] = sectors_pt; |
1176 | info[2] = (int)cylinders; | |
62838ce2 | 1177 | |
62838ce2 S |
1178 | return 0; |
1179 | } | |
aa3d789e | 1180 | |
4b270c8b | 1181 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
aa3d789e | 1182 | { |
4b270c8b S |
1183 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
1184 | struct hv_device *device = host_dev->dev; | |
1185 | ||
aa3d789e S |
1186 | struct storvsc_device *stor_device; |
1187 | struct hv_storvsc_request *request; | |
1188 | struct vstor_packet *vstor_packet; | |
1189 | int ret, t; | |
1190 | ||
aa3d789e | 1191 | |
1eaaddf9 | 1192 | stor_device = get_out_stor_device(device); |
aa3d789e | 1193 | if (!stor_device) |
a00e8224 | 1194 | return FAILED; |
aa3d789e S |
1195 | |
1196 | request = &stor_device->reset_request; | |
1197 | vstor_packet = &request->vstor_packet; | |
1198 | ||
1199 | init_completion(&request->wait_event); | |
1200 | ||
1201 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1202 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1203 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1204 | ||
1205 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
1206 | sizeof(struct vstor_packet), | |
1207 | (unsigned long)&stor_device->reset_request, | |
1208 | VM_PKT_DATA_INBAND, | |
1209 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1210 | if (ret != 0) | |
a00e8224 | 1211 | return FAILED; |
aa3d789e | 1212 | |
46d2eb6d | 1213 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1214 | if (t == 0) |
1215 | return TIMEOUT_ERROR; | |
aa3d789e | 1216 | |
aa3d789e S |
1217 | |
1218 | /* | |
1219 | * At this point, all outstanding requests in the adapter | |
1220 | * should have been flushed out and return to us | |
1221 | */ | |
1222 | ||
a00e8224 | 1223 | return SUCCESS; |
aa3d789e S |
1224 | } |
1225 | ||
c77b63b6 | 1226 | static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
92ae4ebd OH |
1227 | { |
1228 | bool allowed = true; | |
1229 | u8 scsi_op = scmnd->cmnd[0]; | |
1230 | ||
1231 | switch (scsi_op) { | |
c77b63b6 S |
1232 | /* |
1233 | * smartd sends this command and the host does not handle | |
1234 | * this. So, don't send it. | |
1235 | */ | |
41098f8f | 1236 | case SET_WINDOW: |
59e00e74 | 1237 | scmnd->result = ILLEGAL_REQUEST << 16; |
41098f8f S |
1238 | allowed = false; |
1239 | break; | |
1240 | default: | |
1241 | break; | |
92ae4ebd OH |
1242 | } |
1243 | return allowed; | |
1244 | } | |
c5b463ae | 1245 | |
bab445e1 | 1246 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1247 | { |
1248 | int ret; | |
bab445e1 | 1249 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1250 | struct hv_device *dev = host_dev->dev; |
c5b463ae S |
1251 | struct hv_storvsc_request *request; |
1252 | struct storvsc_cmd_request *cmd_request; | |
1253 | unsigned int request_size = 0; | |
1254 | int i; | |
1255 | struct scatterlist *sgl; | |
1256 | unsigned int sg_count = 0; | |
1257 | struct vmscsi_request *vm_srb; | |
ce3e301c | 1258 | struct stor_mem_pools *memp = scmnd->device->hostdata; |
c5b463ae | 1259 | |
c77b63b6 | 1260 | if (!storvsc_scsi_cmd_ok(scmnd)) { |
bab445e1 | 1261 | scmnd->scsi_done(scmnd); |
92ae4ebd OH |
1262 | return 0; |
1263 | } | |
c5b463ae | 1264 | |
c5b463ae S |
1265 | request_size = sizeof(struct storvsc_cmd_request); |
1266 | ||
ce3e301c | 1267 | cmd_request = mempool_alloc(memp->request_mempool, |
c5b463ae | 1268 | GFP_ATOMIC); |
c77b63b6 S |
1269 | |
1270 | /* | |
1271 | * We might be invoked in an interrupt context; hence | |
1272 | * mempool_alloc() can fail. | |
1273 | */ | |
bab445e1 | 1274 | if (!cmd_request) |
c5b463ae | 1275 | return SCSI_MLQUEUE_DEVICE_BUSY; |
bab445e1 | 1276 | |
4e03e697 | 1277 | memset(cmd_request, 0, sizeof(struct storvsc_cmd_request)); |
c5b463ae S |
1278 | |
1279 | /* Setup the cmd request */ | |
c5b463ae S |
1280 | cmd_request->cmd = scmnd; |
1281 | ||
1282 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
1283 | ||
1284 | request = &cmd_request->request; | |
1285 | vm_srb = &request->vstor_packet.vm_srb; | |
1286 | ||
1287 | ||
1288 | /* Build the SRB */ | |
1289 | switch (scmnd->sc_data_direction) { | |
1290 | case DMA_TO_DEVICE: | |
1291 | vm_srb->data_in = WRITE_TYPE; | |
1292 | break; | |
1293 | case DMA_FROM_DEVICE: | |
1294 | vm_srb->data_in = READ_TYPE; | |
1295 | break; | |
1296 | default: | |
1297 | vm_srb->data_in = UNKNOWN_TYPE; | |
1298 | break; | |
1299 | } | |
1300 | ||
93a1bf4d | 1301 | request->cmd = cmd_request; |
c5b463ae | 1302 | |
c5b463ae S |
1303 | vm_srb->port_number = host_dev->port; |
1304 | vm_srb->path_id = scmnd->device->channel; | |
1305 | vm_srb->target_id = scmnd->device->id; | |
1306 | vm_srb->lun = scmnd->device->lun; | |
1307 | ||
c5b463ae S |
1308 | vm_srb->cdb_length = scmnd->cmd_len; |
1309 | ||
1310 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1311 | ||
1312 | request->sense_buffer = scmnd->sense_buffer; | |
1313 | ||
1314 | ||
1315 | request->data_buffer.len = scsi_bufflen(scmnd); | |
1316 | if (scsi_sg_count(scmnd)) { | |
1317 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
1318 | sg_count = scsi_sg_count(scmnd); | |
1319 | ||
1320 | /* check if we need to bounce the sgl */ | |
1321 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
1322 | cmd_request->bounce_sgl = | |
1323 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
6e8087a4 S |
1324 | scsi_bufflen(scmnd), |
1325 | vm_srb->data_in); | |
c5b463ae | 1326 | if (!cmd_request->bounce_sgl) { |
c77b63b6 S |
1327 | ret = SCSI_MLQUEUE_HOST_BUSY; |
1328 | goto queue_error; | |
c5b463ae S |
1329 | } |
1330 | ||
1331 | cmd_request->bounce_sgl_count = | |
1332 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
1333 | PAGE_SHIFT; | |
1334 | ||
fa23b8c7 S |
1335 | if (vm_srb->data_in == WRITE_TYPE) |
1336 | copy_to_bounce_buffer(sgl, | |
1337 | cmd_request->bounce_sgl, | |
1338 | scsi_sg_count(scmnd)); | |
c5b463ae S |
1339 | |
1340 | sgl = cmd_request->bounce_sgl; | |
1341 | sg_count = cmd_request->bounce_sgl_count; | |
1342 | } | |
1343 | ||
1344 | request->data_buffer.offset = sgl[0].offset; | |
1345 | ||
1346 | for (i = 0; i < sg_count; i++) | |
1347 | request->data_buffer.pfn_array[i] = | |
1348 | page_to_pfn(sg_page((&sgl[i]))); | |
1349 | ||
1350 | } else if (scsi_sglist(scmnd)) { | |
c5b463ae S |
1351 | request->data_buffer.offset = |
1352 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
1353 | request->data_buffer.pfn_array[0] = | |
1354 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
1355 | } | |
1356 | ||
c5b463ae | 1357 | /* Invokes the vsc to start an IO */ |
636f0fd1 S |
1358 | ret = storvsc_do_io(dev, &cmd_request->request); |
1359 | ||
d2598f01 | 1360 | if (ret == -EAGAIN) { |
c5b463ae S |
1361 | /* no more space */ |
1362 | ||
c77b63b6 | 1363 | if (cmd_request->bounce_sgl_count) { |
c5b463ae | 1364 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
70691ec6 | 1365 | cmd_request->bounce_sgl_count); |
c5b463ae | 1366 | |
c77b63b6 S |
1367 | ret = SCSI_MLQUEUE_DEVICE_BUSY; |
1368 | goto queue_error; | |
1369 | } | |
c5b463ae S |
1370 | } |
1371 | ||
c77b63b6 S |
1372 | return 0; |
1373 | ||
1374 | queue_error: | |
1375 | mempool_free(cmd_request, memp->request_mempool); | |
1376 | scmnd->host_scribble = NULL; | |
c5b463ae S |
1377 | return ret; |
1378 | } | |
1379 | ||
bef4a34a | 1380 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1381 | .module = THIS_MODULE, |
1382 | .name = "storvsc_host_t", | |
1383 | .bios_param = storvsc_get_chs, | |
1384 | .queuecommand = storvsc_queuecommand, | |
1385 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
1386 | .slave_alloc = storvsc_device_alloc, | |
ce3e301c | 1387 | .slave_destroy = storvsc_device_destroy, |
ff568d3a GKH |
1388 | .slave_configure = storvsc_device_configure, |
1389 | .cmd_per_lun = 1, | |
1390 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 1391 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 1392 | .this_id = -1, |
454f18a9 | 1393 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
1394 | /* currently 32 */ |
1395 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
039db52d | 1396 | .use_clustering = DISABLE_CLUSTERING, |
454f18a9 | 1397 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1398 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
1399 | }; |
1400 | ||
ef52a81b S |
1401 | enum { |
1402 | SCSI_GUID, | |
1403 | IDE_GUID, | |
1404 | }; | |
1405 | ||
d847b5fe | 1406 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 GKH |
1407 | /* SCSI guid */ |
1408 | { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, | |
ef52a81b S |
1409 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) |
1410 | .driver_data = SCSI_GUID }, | |
21e37742 S |
1411 | /* IDE guid */ |
1412 | { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, | |
ef52a81b S |
1413 | 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) |
1414 | .driver_data = IDE_GUID }, | |
c45cf2d4 | 1415 | { }, |
d847b5fe | 1416 | }; |
bef4a34a | 1417 | |
d847b5fe | 1418 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1419 | |
84946899 S |
1420 | static int storvsc_probe(struct hv_device *device, |
1421 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1422 | { |
ff568d3a | 1423 | int ret; |
bef4a34a | 1424 | struct Scsi_Host *host; |
795b613d | 1425 | struct hv_host_device *host_dev; |
ef52a81b | 1426 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
bd1f5d6a | 1427 | int target = 0; |
6e4198ce | 1428 | struct storvsc_device *stor_device; |
bd1f5d6a | 1429 | |
ff568d3a | 1430 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1431 | sizeof(struct hv_host_device)); |
f8feed06 | 1432 | if (!host) |
bef4a34a | 1433 | return -ENOMEM; |
bef4a34a | 1434 | |
7f33f30a | 1435 | host_dev = shost_priv(host); |
795b613d | 1436 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
bef4a34a | 1437 | |
795b613d | 1438 | host_dev->port = host->host_no; |
97c15296 | 1439 | host_dev->dev = device; |
bef4a34a | 1440 | |
4e03e697 | 1441 | |
a13d35ab | 1442 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1443 | if (!stor_device) { |
225ce6ea | 1444 | ret = -ENOMEM; |
ce3e301c | 1445 | goto err_out0; |
6e4198ce | 1446 | } |
9efd21e1 | 1447 | |
a13d35ab S |
1448 | stor_device->destroy = false; |
1449 | init_waitqueue_head(&stor_device->waiting_to_drain); | |
1450 | stor_device->device = device; | |
cd654ea1 S |
1451 | stor_device->host = host; |
1452 | hv_set_drvdata(device, stor_device); | |
a13d35ab | 1453 | |
6e4198ce S |
1454 | stor_device->port_number = host->host_no; |
1455 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); | |
225ce6ea | 1456 | if (ret) |
ce3e301c | 1457 | goto err_out1; |
bef4a34a | 1458 | |
6e4198ce S |
1459 | host_dev->path = stor_device->path_id; |
1460 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1461 | |
ff568d3a GKH |
1462 | /* max # of devices per target */ |
1463 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
1464 | /* max # of targets per channel */ | |
1465 | host->max_id = STORVSC_MAX_TARGETS; | |
1466 | /* max # of channels */ | |
1467 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
cf55f4a8 MS |
1468 | /* max cmd length */ |
1469 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 1470 | |
454f18a9 | 1471 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1472 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 1473 | if (ret != 0) |
ce3e301c | 1474 | goto err_out2; |
bef4a34a | 1475 | |
bd1f5d6a S |
1476 | if (!dev_is_ide) { |
1477 | scsi_scan_host(host); | |
59d22950 S |
1478 | } else { |
1479 | target = (device->dev_instance.b[5] << 8 | | |
1480 | device->dev_instance.b[4]); | |
1481 | ret = scsi_add_device(host, 0, target, 0); | |
1482 | if (ret) { | |
1483 | scsi_remove_host(host); | |
1484 | goto err_out2; | |
1485 | } | |
bef4a34a | 1486 | } |
bd1f5d6a | 1487 | return 0; |
bef4a34a | 1488 | |
ce3e301c | 1489 | err_out2: |
225ce6ea S |
1490 | /* |
1491 | * Once we have connected with the host, we would need to | |
1492 | * to invoke storvsc_dev_remove() to rollback this state and | |
1493 | * this call also frees up the stor_device; hence the jump around | |
ce3e301c | 1494 | * err_out1 label. |
225ce6ea | 1495 | */ |
bd1f5d6a | 1496 | storvsc_dev_remove(device); |
ce3e301c | 1497 | goto err_out0; |
225ce6ea S |
1498 | |
1499 | err_out1: | |
ce3e301c | 1500 | kfree(stor_device); |
225ce6ea S |
1501 | |
1502 | err_out0: | |
bd1f5d6a | 1503 | scsi_host_put(host); |
225ce6ea | 1504 | return ret; |
bef4a34a HJ |
1505 | } |
1506 | ||
ddcbf65e S |
1507 | static int storvsc_remove(struct hv_device *dev) |
1508 | { | |
1509 | struct storvsc_device *stor_device = hv_get_drvdata(dev); | |
1510 | struct Scsi_Host *host = stor_device->host; | |
1511 | ||
1512 | scsi_remove_host(host); | |
1513 | storvsc_dev_remove(dev); | |
1514 | scsi_host_put(host); | |
1515 | ||
1516 | return 0; | |
1517 | } | |
1518 | ||
40bf63ed | 1519 | static struct hv_driver storvsc_drv = { |
fafb0efc | 1520 | .name = KBUILD_MODNAME, |
d847b5fe | 1521 | .id_table = id_table, |
40bf63ed S |
1522 | .probe = storvsc_probe, |
1523 | .remove = storvsc_remove, | |
39ae6fae | 1524 | }; |
7bd05b91 | 1525 | |
d9bbae83 | 1526 | static int __init storvsc_drv_init(void) |
f5c78872 | 1527 | { |
01415ab3 S |
1528 | u32 max_outstanding_req_per_channel; |
1529 | ||
1530 | /* | |
1531 | * Divide the ring buffer data size (which is 1 page less | |
1532 | * than the ring buffer size since that page is reserved for | |
1533 | * the ring buffer indices) by the max request size (which is | |
1534 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1535 | */ | |
01415ab3 | 1536 | max_outstanding_req_per_channel = |
768fa219 GKH |
1537 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1538 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
1539 | sizeof(struct vstor_packet) + sizeof(u64), | |
1540 | sizeof(u64))); | |
f5c78872 | 1541 | |
01415ab3 | 1542 | if (max_outstanding_req_per_channel < |
f5c78872 | 1543 | STORVSC_MAX_IO_REQUESTS) |
b06efc19 | 1544 | return -EINVAL; |
f5c78872 | 1545 | |
768fa219 | 1546 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1547 | } |
1548 | ||
c63ba9e1 | 1549 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1550 | { |
768fa219 | 1551 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1552 | } |
1553 | ||
ff568d3a | 1554 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1555 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 1556 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1557 | module_init(storvsc_drv_init); |
c63ba9e1 | 1558 | module_exit(storvsc_drv_exit); |