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 | ||
09f0355f S |
84 | /* |
85 | * This will get replaced with the max transfer length that is possible on | |
86 | * the host adapter. | |
87 | * The max transfer length will be published when we offer a vmbus channel. | |
88 | */ | |
89 | ||
f0d79fe9 S |
90 | #define MAX_TRANSFER_LENGTH 0x40000 |
91 | #define DEFAULT_PACKET_SIZE (sizeof(struct vmdata_gpa_direct) + \ | |
92 | sizeof(struct vstor_packet) + \ | |
93 | sizesizeof(u64) * (MAX_TRANSFER_LENGTH / PAGE_SIZE))) | |
94 | ||
95 | ||
96 | /* Packet structure describing virtual storage requests. */ | |
97 | enum vstor_packet_operation { | |
98 | VSTOR_OPERATION_COMPLETE_IO = 1, | |
99 | VSTOR_OPERATION_REMOVE_DEVICE = 2, | |
100 | VSTOR_OPERATION_EXECUTE_SRB = 3, | |
101 | VSTOR_OPERATION_RESET_LUN = 4, | |
102 | VSTOR_OPERATION_RESET_ADAPTER = 5, | |
103 | VSTOR_OPERATION_RESET_BUS = 6, | |
104 | VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, | |
105 | VSTOR_OPERATION_END_INITIALIZATION = 8, | |
106 | VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, | |
107 | VSTOR_OPERATION_QUERY_PROPERTIES = 10, | |
2b9525f5 S |
108 | VSTOR_OPERATION_ENUMERATE_BUS = 11, |
109 | VSTOR_OPERATION_MAXIMUM = 11 | |
f0d79fe9 S |
110 | }; |
111 | ||
112 | /* | |
113 | * Platform neutral description of a scsi request - | |
114 | * this remains the same across the write regardless of 32/64 bit | |
115 | * note: it's patterned off the SCSI_PASS_THROUGH structure | |
116 | */ | |
117 | #define CDB16GENERIC_LENGTH 0x10 | |
118 | ||
119 | #ifndef SENSE_BUFFER_SIZE | |
120 | #define SENSE_BUFFER_SIZE 0x12 | |
121 | #endif | |
122 | ||
123 | #define MAX_DATA_BUF_LEN_WITH_PADDING 0x14 | |
124 | ||
125 | struct vmscsi_request { | |
c649114a S |
126 | u16 length; |
127 | u8 srb_status; | |
128 | u8 scsi_status; | |
f0d79fe9 | 129 | |
c649114a S |
130 | u8 port_number; |
131 | u8 path_id; | |
132 | u8 target_id; | |
133 | u8 lun; | |
f0d79fe9 | 134 | |
c649114a S |
135 | u8 cdb_length; |
136 | u8 sense_info_length; | |
137 | u8 data_in; | |
138 | u8 reserved; | |
f0d79fe9 | 139 | |
c649114a | 140 | u32 data_transfer_length; |
f0d79fe9 S |
141 | |
142 | union { | |
c649114a S |
143 | u8 cdb[CDB16GENERIC_LENGTH]; |
144 | u8 sense_data[SENSE_BUFFER_SIZE]; | |
145 | u8 reserved_array[MAX_DATA_BUF_LEN_WITH_PADDING]; | |
f0d79fe9 S |
146 | }; |
147 | } __attribute((packed)); | |
148 | ||
149 | ||
150 | /* | |
151 | * This structure is sent during the intialization phase to get the different | |
152 | * properties of the channel. | |
153 | */ | |
154 | struct vmstorage_channel_properties { | |
c649114a S |
155 | u16 protocol_version; |
156 | u8 path_id; | |
157 | u8 target_id; | |
f0d79fe9 S |
158 | |
159 | /* Note: port number is only really known on the client side */ | |
c649114a S |
160 | u32 port_number; |
161 | u32 flags; | |
162 | u32 max_transfer_bytes; | |
f0d79fe9 | 163 | |
c649114a S |
164 | /* |
165 | * This id is unique for each channel and will correspond with | |
166 | * vendor specific data in the inquiry data. | |
167 | */ | |
168 | ||
169 | u64 unique_id; | |
f0d79fe9 S |
170 | } __packed; |
171 | ||
172 | /* This structure is sent during the storage protocol negotiations. */ | |
173 | struct vmstorage_protocol_version { | |
174 | /* Major (MSW) and minor (LSW) version numbers. */ | |
85904a5e | 175 | u16 major_minor; |
f0d79fe9 S |
176 | |
177 | /* | |
178 | * Revision number is auto-incremented whenever this file is changed | |
179 | * (See FILL_VMSTOR_REVISION macro above). Mismatch does not | |
180 | * definitely indicate incompatibility--but it does indicate mismatched | |
181 | * builds. | |
c649114a | 182 | * This is only used on the windows side. Just set it to 0. |
f0d79fe9 | 183 | */ |
85904a5e | 184 | u16 revision; |
f0d79fe9 S |
185 | } __packed; |
186 | ||
187 | /* Channel Property Flags */ | |
188 | #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 | |
189 | #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 | |
190 | ||
191 | struct vstor_packet { | |
192 | /* Requested operation type */ | |
193 | enum vstor_packet_operation operation; | |
194 | ||
195 | /* Flags - see below for values */ | |
c649114a | 196 | u32 flags; |
f0d79fe9 S |
197 | |
198 | /* Status of the request returned from the server side. */ | |
c649114a | 199 | u32 status; |
f0d79fe9 S |
200 | |
201 | /* Data payload area */ | |
202 | union { | |
203 | /* | |
204 | * Structure used to forward SCSI commands from the | |
205 | * client to the server. | |
206 | */ | |
207 | struct vmscsi_request vm_srb; | |
208 | ||
209 | /* Structure used to query channel properties. */ | |
210 | struct vmstorage_channel_properties storage_channel_properties; | |
211 | ||
212 | /* Used during version negotiations. */ | |
213 | struct vmstorage_protocol_version version; | |
214 | }; | |
215 | } __packed; | |
216 | ||
f0d79fe9 | 217 | /* |
09f0355f S |
218 | * Packet Flags: |
219 | * | |
f0d79fe9 S |
220 | * This flag indicates that the server should send back a completion for this |
221 | * packet. | |
222 | */ | |
09f0355f | 223 | |
f0d79fe9 S |
224 | #define REQUEST_COMPLETION_FLAG 0x1 |
225 | ||
f0d79fe9 S |
226 | #define STORVSC_MAX_IO_REQUESTS 128 |
227 | ||
228 | /* | |
229 | * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In | |
230 | * reality, the path/target is not used (ie always set to 0) so our | |
231 | * scsi host adapter essentially has 1 bus with 1 target that contains | |
232 | * up to 256 luns. | |
233 | */ | |
234 | #define STORVSC_MAX_LUNS_PER_TARGET 64 | |
235 | #define STORVSC_MAX_TARGETS 1 | |
236 | #define STORVSC_MAX_CHANNELS 1 | |
cf55f4a8 | 237 | #define STORVSC_MAX_CMD_LEN 16 |
f0d79fe9 | 238 | |
f0d79fe9 S |
239 | /* Matches Windows-end */ |
240 | enum storvsc_request_type { | |
c649114a | 241 | WRITE_TYPE = 0, |
f0d79fe9 S |
242 | READ_TYPE, |
243 | UNKNOWN_TYPE, | |
244 | }; | |
245 | ||
16046320 S |
246 | /* |
247 | * SRB status codes and masks; a subset of the codes used here. | |
248 | */ | |
249 | ||
250 | #define SRB_STATUS_AUTOSENSE_VALID 0x80 | |
251 | #define SRB_STATUS_INVALID_LUN 0x20 | |
252 | #define SRB_STATUS_SUCCESS 0x01 | |
253 | #define SRB_STATUS_ERROR 0x04 | |
254 | ||
255 | ||
f0d79fe9 S |
256 | |
257 | struct hv_storvsc_request { | |
f0d79fe9 S |
258 | struct hv_device *device; |
259 | ||
260 | /* Synchronize the request/response if needed */ | |
261 | struct completion wait_event; | |
262 | ||
263 | unsigned char *sense_buffer; | |
93a1bf4d | 264 | struct storvsc_cmd_request *cmd; |
f0d79fe9 S |
265 | struct hv_multipage_buffer data_buffer; |
266 | ||
267 | struct vstor_packet vstor_packet; | |
268 | }; | |
269 | ||
270 | ||
f0d79fe9 S |
271 | /* A storvsc device is a device object that contains a vmbus channel */ |
272 | struct storvsc_device { | |
273 | struct hv_device *device; | |
274 | ||
275 | bool destroy; | |
276 | bool drain_notify; | |
277 | atomic_t num_outstanding_req; | |
cd654ea1 | 278 | struct Scsi_Host *host; |
f0d79fe9 S |
279 | |
280 | wait_queue_head_t waiting_to_drain; | |
281 | ||
282 | /* | |
283 | * Each unique Port/Path/Target represents 1 channel ie scsi | |
284 | * controller. In reality, the pathid, targetid is always 0 | |
285 | * and the port is set by us | |
286 | */ | |
287 | unsigned int port_number; | |
288 | unsigned char path_id; | |
289 | unsigned char target_id; | |
290 | ||
291 | /* Used for vsc/vsp channel reset process */ | |
292 | struct hv_storvsc_request init_request; | |
293 | struct hv_storvsc_request reset_request; | |
294 | }; | |
295 | ||
ce3e301c | 296 | struct stor_mem_pools { |
c1b3d067 | 297 | struct kmem_cache *request_pool; |
4e03e697 | 298 | mempool_t *request_mempool; |
ce3e301c S |
299 | }; |
300 | ||
301 | struct hv_host_device { | |
302 | struct hv_device *dev; | |
c1b3d067 S |
303 | unsigned int port; |
304 | unsigned char path; | |
305 | unsigned char target; | |
306 | }; | |
307 | ||
308 | struct storvsc_cmd_request { | |
309 | struct list_head entry; | |
310 | struct scsi_cmnd *cmd; | |
311 | ||
312 | unsigned int bounce_sgl_count; | |
313 | struct scatterlist *bounce_sgl; | |
314 | ||
315 | struct hv_storvsc_request request; | |
316 | }; | |
f0d79fe9 | 317 | |
12675799 S |
318 | struct storvsc_scan_work { |
319 | struct work_struct work; | |
320 | struct Scsi_Host *host; | |
321 | uint lun; | |
322 | }; | |
323 | ||
324 | static void storvsc_bus_scan(struct work_struct *work) | |
325 | { | |
326 | struct storvsc_scan_work *wrk; | |
327 | int id, order_id; | |
328 | ||
329 | wrk = container_of(work, struct storvsc_scan_work, work); | |
330 | for (id = 0; id < wrk->host->max_id; ++id) { | |
331 | if (wrk->host->reverse_ordering) | |
332 | order_id = wrk->host->max_id - id - 1; | |
333 | else | |
334 | order_id = id; | |
335 | ||
336 | scsi_scan_target(&wrk->host->shost_gendev, 0, | |
337 | order_id, SCAN_WILD_CARD, 1); | |
338 | } | |
339 | kfree(wrk); | |
340 | } | |
341 | ||
b4017319 S |
342 | static void storvsc_remove_lun(struct work_struct *work) |
343 | { | |
344 | struct storvsc_scan_work *wrk; | |
345 | struct scsi_device *sdev; | |
346 | ||
347 | wrk = container_of(work, struct storvsc_scan_work, work); | |
348 | if (!scsi_host_get(wrk->host)) | |
349 | goto done; | |
350 | ||
351 | sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); | |
352 | ||
353 | if (sdev) { | |
354 | scsi_remove_device(sdev); | |
355 | scsi_device_put(sdev); | |
356 | } | |
357 | scsi_host_put(wrk->host); | |
358 | ||
359 | done: | |
360 | kfree(wrk); | |
361 | } | |
362 | ||
a8c18c57 S |
363 | /* |
364 | * We can get incoming messages from the host that are not in response to | |
365 | * messages that we have sent out. An example of this would be messages | |
366 | * received by the guest to notify dynamic addition/removal of LUNs. To | |
367 | * deal with potential race conditions where the driver may be in the | |
368 | * midst of being unloaded when we might receive an unsolicited message | |
369 | * from the host, we have implemented a mechanism to gurantee sequential | |
370 | * consistency: | |
371 | * | |
372 | * 1) Once the device is marked as being destroyed, we will fail all | |
373 | * outgoing messages. | |
374 | * 2) We permit incoming messages when the device is being destroyed, | |
375 | * only to properly account for messages already sent out. | |
376 | */ | |
377 | ||
f0d79fe9 S |
378 | static inline struct storvsc_device *get_out_stor_device( |
379 | struct hv_device *device) | |
380 | { | |
381 | struct storvsc_device *stor_device; | |
382 | ||
cd654ea1 | 383 | stor_device = hv_get_drvdata(device); |
f0d79fe9 S |
384 | |
385 | if (stor_device && stor_device->destroy) | |
386 | stor_device = NULL; | |
387 | ||
388 | return stor_device; | |
389 | } | |
390 | ||
391 | ||
392 | static inline void storvsc_wait_to_drain(struct storvsc_device *dev) | |
393 | { | |
394 | dev->drain_notify = true; | |
395 | wait_event(dev->waiting_to_drain, | |
396 | atomic_read(&dev->num_outstanding_req) == 0); | |
397 | dev->drain_notify = false; | |
398 | } | |
bef4a34a | 399 | |
8dcf37d4 S |
400 | static inline struct storvsc_device *get_in_stor_device( |
401 | struct hv_device *device) | |
402 | { | |
403 | struct storvsc_device *stor_device; | |
8dcf37d4 | 404 | |
cd654ea1 | 405 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
406 | |
407 | if (!stor_device) | |
408 | goto get_in_err; | |
409 | ||
410 | /* | |
411 | * If the device is being destroyed; allow incoming | |
412 | * traffic only to cleanup outstanding requests. | |
413 | */ | |
414 | ||
415 | if (stor_device->destroy && | |
416 | (atomic_read(&stor_device->num_outstanding_req) == 0)) | |
417 | stor_device = NULL; | |
418 | ||
419 | get_in_err: | |
8dcf37d4 S |
420 | return stor_device; |
421 | ||
422 | } | |
423 | ||
2707388c S |
424 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
425 | unsigned int sg_count) | |
426 | { | |
427 | int i; | |
428 | struct page *page_buf; | |
429 | ||
430 | for (i = 0; i < sg_count; i++) { | |
431 | page_buf = sg_page((&sgl[i])); | |
432 | if (page_buf != NULL) | |
433 | __free_page(page_buf); | |
434 | } | |
435 | ||
436 | kfree(sgl); | |
437 | } | |
438 | ||
439 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
440 | { | |
441 | int i; | |
442 | ||
443 | /* No need to check */ | |
444 | if (sg_count < 2) | |
445 | return -1; | |
446 | ||
447 | /* We have at least 2 sg entries */ | |
448 | for (i = 0; i < sg_count; i++) { | |
449 | if (i == 0) { | |
450 | /* make sure 1st one does not have hole */ | |
451 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
452 | return i; | |
453 | } else if (i == sg_count - 1) { | |
454 | /* make sure last one does not have hole */ | |
455 | if (sgl[i].offset != 0) | |
456 | return i; | |
457 | } else { | |
458 | /* make sure no hole in the middle */ | |
459 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
460 | return i; | |
461 | } | |
462 | } | |
463 | return -1; | |
464 | } | |
465 | ||
466 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, | |
467 | unsigned int sg_count, | |
468 | unsigned int len, | |
469 | int write) | |
470 | { | |
471 | int i; | |
472 | int num_pages; | |
473 | struct scatterlist *bounce_sgl; | |
474 | struct page *page_buf; | |
475 | unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE); | |
476 | ||
477 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; | |
478 | ||
479 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); | |
480 | if (!bounce_sgl) | |
481 | return NULL; | |
482 | ||
483 | for (i = 0; i < num_pages; i++) { | |
484 | page_buf = alloc_page(GFP_ATOMIC); | |
485 | if (!page_buf) | |
486 | goto cleanup; | |
487 | sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0); | |
488 | } | |
489 | ||
490 | return bounce_sgl; | |
491 | ||
492 | cleanup: | |
493 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
494 | return NULL; | |
495 | } | |
496 | ||
497 | /* Assume the original sgl has enough room */ | |
498 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, | |
499 | struct scatterlist *bounce_sgl, | |
500 | unsigned int orig_sgl_count, | |
501 | unsigned int bounce_sgl_count) | |
502 | { | |
503 | int i; | |
504 | int j = 0; | |
505 | unsigned long src, dest; | |
506 | unsigned int srclen, destlen, copylen; | |
507 | unsigned int total_copied = 0; | |
508 | unsigned long bounce_addr = 0; | |
509 | unsigned long dest_addr = 0; | |
510 | unsigned long flags; | |
511 | ||
512 | local_irq_save(flags); | |
513 | ||
514 | for (i = 0; i < orig_sgl_count; i++) { | |
515 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
516 | KM_IRQ0) + orig_sgl[i].offset; | |
517 | dest = dest_addr; | |
518 | destlen = orig_sgl[i].length; | |
519 | ||
520 | if (bounce_addr == 0) | |
521 | bounce_addr = | |
522 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
523 | KM_IRQ0); | |
524 | ||
525 | while (destlen) { | |
526 | src = bounce_addr + bounce_sgl[j].offset; | |
527 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
528 | ||
529 | copylen = min(srclen, destlen); | |
530 | memcpy((void *)dest, (void *)src, copylen); | |
531 | ||
532 | total_copied += copylen; | |
533 | bounce_sgl[j].offset += copylen; | |
534 | destlen -= copylen; | |
535 | dest += copylen; | |
536 | ||
537 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { | |
538 | /* full */ | |
539 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
540 | j++; | |
541 | ||
542 | /* | |
543 | * It is possible that the number of elements | |
544 | * in the bounce buffer may not be equal to | |
545 | * the number of elements in the original | |
546 | * scatter list. Handle this correctly. | |
547 | */ | |
548 | ||
549 | if (j == bounce_sgl_count) { | |
550 | /* | |
551 | * We are done; cleanup and return. | |
552 | */ | |
553 | kunmap_atomic((void *)(dest_addr - | |
554 | orig_sgl[i].offset), | |
555 | KM_IRQ0); | |
556 | local_irq_restore(flags); | |
557 | return total_copied; | |
558 | } | |
559 | ||
560 | /* if we need to use another bounce buffer */ | |
561 | if (destlen || i != orig_sgl_count - 1) | |
562 | bounce_addr = | |
563 | (unsigned long)kmap_atomic( | |
564 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
565 | } else if (destlen == 0 && i == orig_sgl_count - 1) { | |
566 | /* unmap the last bounce that is < PAGE_SIZE */ | |
567 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
568 | } | |
569 | } | |
570 | ||
571 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), | |
572 | KM_IRQ0); | |
573 | } | |
574 | ||
575 | local_irq_restore(flags); | |
576 | ||
577 | return total_copied; | |
578 | } | |
579 | ||
580 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ | |
581 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
582 | struct scatterlist *bounce_sgl, | |
583 | unsigned int orig_sgl_count) | |
584 | { | |
585 | int i; | |
586 | int j = 0; | |
587 | unsigned long src, dest; | |
588 | unsigned int srclen, destlen, copylen; | |
589 | unsigned int total_copied = 0; | |
590 | unsigned long bounce_addr = 0; | |
591 | unsigned long src_addr = 0; | |
592 | unsigned long flags; | |
593 | ||
594 | local_irq_save(flags); | |
595 | ||
596 | for (i = 0; i < orig_sgl_count; i++) { | |
597 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
598 | KM_IRQ0) + orig_sgl[i].offset; | |
599 | src = src_addr; | |
600 | srclen = orig_sgl[i].length; | |
601 | ||
602 | if (bounce_addr == 0) | |
603 | bounce_addr = | |
604 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), | |
605 | KM_IRQ0); | |
606 | ||
607 | while (srclen) { | |
608 | /* assume bounce offset always == 0 */ | |
609 | dest = bounce_addr + bounce_sgl[j].length; | |
610 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
611 | ||
612 | copylen = min(srclen, destlen); | |
613 | memcpy((void *)dest, (void *)src, copylen); | |
614 | ||
615 | total_copied += copylen; | |
616 | bounce_sgl[j].length += copylen; | |
617 | srclen -= copylen; | |
618 | src += copylen; | |
619 | ||
620 | if (bounce_sgl[j].length == PAGE_SIZE) { | |
621 | /* full..move to next entry */ | |
622 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
623 | j++; | |
624 | ||
625 | /* if we need to use another bounce buffer */ | |
626 | if (srclen || i != orig_sgl_count - 1) | |
627 | bounce_addr = | |
628 | (unsigned long)kmap_atomic( | |
629 | sg_page((&bounce_sgl[j])), KM_IRQ0); | |
630 | ||
631 | } else if (srclen == 0 && i == orig_sgl_count - 1) { | |
632 | /* unmap the last bounce that is < PAGE_SIZE */ | |
633 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
634 | } | |
635 | } | |
636 | ||
637 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
638 | } | |
639 | ||
640 | local_irq_restore(flags); | |
641 | ||
642 | return total_copied; | |
643 | } | |
644 | ||
8dcf37d4 S |
645 | static int storvsc_channel_init(struct hv_device *device) |
646 | { | |
647 | struct storvsc_device *stor_device; | |
648 | struct hv_storvsc_request *request; | |
649 | struct vstor_packet *vstor_packet; | |
650 | int ret, t; | |
651 | ||
652 | stor_device = get_out_stor_device(device); | |
653 | if (!stor_device) | |
654 | return -ENODEV; | |
655 | ||
656 | request = &stor_device->init_request; | |
657 | vstor_packet = &request->vstor_packet; | |
658 | ||
659 | /* | |
660 | * Now, initiate the vsc/vsp initialization protocol on the open | |
661 | * channel | |
662 | */ | |
663 | memset(request, 0, sizeof(struct hv_storvsc_request)); | |
664 | init_completion(&request->wait_event); | |
665 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; | |
666 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
667 | ||
668 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
669 | sizeof(struct vstor_packet), | |
670 | (unsigned long)request, | |
671 | VM_PKT_DATA_INBAND, | |
672 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
673 | if (ret != 0) | |
674 | goto cleanup; | |
675 | ||
676 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
677 | if (t == 0) { | |
678 | ret = -ETIMEDOUT; | |
679 | goto cleanup; | |
680 | } | |
681 | ||
682 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
683 | vstor_packet->status != 0) | |
684 | goto cleanup; | |
685 | ||
686 | ||
687 | /* reuse the packet for version range supported */ | |
688 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
689 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
690 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
691 | ||
85904a5e S |
692 | vstor_packet->version.major_minor = |
693 | storvsc_get_version(VMSTOR_CURRENT_MAJOR, VMSTOR_CURRENT_MINOR); | |
694 | ||
695 | /* | |
696 | * The revision number is only used in Windows; set it to 0. | |
697 | */ | |
c649114a | 698 | vstor_packet->version.revision = 0; |
8dcf37d4 S |
699 | |
700 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
701 | sizeof(struct vstor_packet), | |
702 | (unsigned long)request, | |
703 | VM_PKT_DATA_INBAND, | |
704 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
705 | if (ret != 0) | |
706 | goto cleanup; | |
707 | ||
708 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
709 | if (t == 0) { | |
710 | ret = -ETIMEDOUT; | |
711 | goto cleanup; | |
712 | } | |
713 | ||
714 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
715 | vstor_packet->status != 0) | |
716 | goto cleanup; | |
717 | ||
718 | ||
719 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
720 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
721 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
722 | vstor_packet->storage_channel_properties.port_number = | |
723 | stor_device->port_number; | |
724 | ||
725 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
726 | sizeof(struct vstor_packet), | |
727 | (unsigned long)request, | |
728 | VM_PKT_DATA_INBAND, | |
729 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
730 | ||
731 | if (ret != 0) | |
732 | goto cleanup; | |
733 | ||
734 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
735 | if (t == 0) { | |
736 | ret = -ETIMEDOUT; | |
737 | goto cleanup; | |
738 | } | |
739 | ||
740 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
741 | vstor_packet->status != 0) | |
742 | goto cleanup; | |
743 | ||
744 | stor_device->path_id = vstor_packet->storage_channel_properties.path_id; | |
745 | stor_device->target_id | |
746 | = vstor_packet->storage_channel_properties.target_id; | |
747 | ||
748 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); | |
749 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
750 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
751 | ||
752 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
753 | sizeof(struct vstor_packet), | |
754 | (unsigned long)request, | |
755 | VM_PKT_DATA_INBAND, | |
756 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
757 | ||
758 | if (ret != 0) | |
759 | goto cleanup; | |
760 | ||
761 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); | |
762 | if (t == 0) { | |
763 | ret = -ETIMEDOUT; | |
764 | goto cleanup; | |
765 | } | |
766 | ||
767 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || | |
768 | vstor_packet->status != 0) | |
769 | goto cleanup; | |
770 | ||
771 | ||
772 | cleanup: | |
773 | return ret; | |
774 | } | |
775 | ||
2707388c S |
776 | |
777 | static void storvsc_command_completion(struct hv_storvsc_request *request) | |
8dcf37d4 | 778 | { |
93a1bf4d | 779 | struct storvsc_cmd_request *cmd_request = request->cmd; |
2707388c S |
780 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
781 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); | |
782 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
783 | struct scsi_sense_hdr sense_hdr; | |
784 | struct vmscsi_request *vm_srb; | |
785 | struct storvsc_scan_work *wrk; | |
786 | struct stor_mem_pools *memp = scmnd->device->hostdata; | |
8dcf37d4 | 787 | |
2707388c S |
788 | vm_srb = &request->vstor_packet.vm_srb; |
789 | if (cmd_request->bounce_sgl_count) { | |
790 | if (vm_srb->data_in == READ_TYPE) | |
791 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
792 | cmd_request->bounce_sgl, | |
793 | scsi_sg_count(scmnd), | |
794 | cmd_request->bounce_sgl_count); | |
795 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
796 | cmd_request->bounce_sgl_count); | |
797 | } | |
8dcf37d4 | 798 | |
4ed51a21 | 799 | /* |
2707388c S |
800 | * If there is an error; offline the device since all |
801 | * error recovery strategies would have already been | |
802 | * deployed on the host side. | |
803 | */ | |
804 | if (vm_srb->srb_status == SRB_STATUS_ERROR) | |
805 | scmnd->result = DID_TARGET_FAILURE << 16; | |
806 | else | |
807 | scmnd->result = vm_srb->scsi_status; | |
808 | ||
809 | /* | |
810 | * If the LUN is invalid; remove the device. | |
811 | */ | |
812 | if (vm_srb->srb_status == SRB_STATUS_INVALID_LUN) { | |
813 | struct storvsc_device *stor_dev; | |
814 | struct hv_device *dev = host_dev->dev; | |
815 | struct Scsi_Host *host; | |
816 | ||
817 | stor_dev = get_in_stor_device(dev); | |
818 | host = stor_dev->host; | |
819 | ||
820 | wrk = kmalloc(sizeof(struct storvsc_scan_work), | |
821 | GFP_ATOMIC); | |
822 | if (!wrk) { | |
823 | scmnd->result = DID_TARGET_FAILURE << 16; | |
824 | } else { | |
825 | wrk->host = host; | |
826 | wrk->lun = vm_srb->lun; | |
827 | INIT_WORK(&wrk->work, storvsc_remove_lun); | |
828 | schedule_work(&wrk->work); | |
829 | } | |
830 | } | |
831 | ||
832 | if (scmnd->result) { | |
833 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
834 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) | |
835 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
836 | } | |
837 | ||
838 | scsi_set_resid(scmnd, | |
839 | request->data_buffer.len - | |
840 | vm_srb->data_transfer_length); | |
841 | ||
842 | scsi_done_fn = scmnd->scsi_done; | |
843 | ||
844 | scmnd->host_scribble = NULL; | |
845 | scmnd->scsi_done = NULL; | |
846 | ||
847 | scsi_done_fn(scmnd); | |
848 | ||
849 | mempool_free(cmd_request, memp->request_mempool); | |
850 | } | |
851 | ||
852 | static void storvsc_on_io_completion(struct hv_device *device, | |
853 | struct vstor_packet *vstor_packet, | |
854 | struct hv_storvsc_request *request) | |
855 | { | |
856 | struct storvsc_device *stor_device; | |
857 | struct vstor_packet *stor_pkt; | |
858 | ||
859 | stor_device = hv_get_drvdata(device); | |
860 | stor_pkt = &request->vstor_packet; | |
861 | ||
862 | /* | |
863 | * The current SCSI handling on the host side does | |
864 | * not correctly handle: | |
865 | * INQUIRY command with page code parameter set to 0x80 | |
866 | * MODE_SENSE command with cmd[2] == 0x1c | |
867 | * | |
868 | * Setup srb and scsi status so this won't be fatal. | |
869 | * We do this so we can distinguish truly fatal failues | |
4ed51a21 S |
870 | * (srb status == 0x4) and off-line the device in that case. |
871 | */ | |
872 | ||
873 | if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || | |
a8c18c57 | 874 | (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
4ed51a21 | 875 | vstor_packet->vm_srb.scsi_status = 0; |
16046320 | 876 | vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
4ed51a21 S |
877 | } |
878 | ||
8dcf37d4 S |
879 | |
880 | /* Copy over the status...etc */ | |
881 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; | |
882 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
883 | stor_pkt->vm_srb.sense_info_length = | |
884 | vstor_packet->vm_srb.sense_info_length; | |
885 | ||
886 | if (vstor_packet->vm_srb.scsi_status != 0 || | |
16046320 | 887 | vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){ |
d181daa0 GKH |
888 | dev_warn(&device->device, |
889 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
890 | stor_pkt->vm_srb.cdb[0], | |
891 | vstor_packet->vm_srb.scsi_status, | |
892 | vstor_packet->vm_srb.srb_status); | |
8dcf37d4 S |
893 | } |
894 | ||
895 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { | |
896 | /* CHECK_CONDITION */ | |
16046320 S |
897 | if (vstor_packet->vm_srb.srb_status & |
898 | SRB_STATUS_AUTOSENSE_VALID) { | |
8dcf37d4 | 899 | /* autosense data available */ |
d181daa0 | 900 | dev_warn(&device->device, |
41098f8f S |
901 | "stor pkt %p autosense data valid - len %d\n", |
902 | request, | |
903 | vstor_packet->vm_srb.sense_info_length); | |
8dcf37d4 S |
904 | |
905 | memcpy(request->sense_buffer, | |
906 | vstor_packet->vm_srb.sense_data, | |
907 | vstor_packet->vm_srb.sense_info_length); | |
908 | ||
909 | } | |
910 | } | |
911 | ||
912 | stor_pkt->vm_srb.data_transfer_length = | |
913 | vstor_packet->vm_srb.data_transfer_length; | |
914 | ||
2707388c | 915 | storvsc_command_completion(request); |
8dcf37d4 S |
916 | |
917 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && | |
918 | stor_device->drain_notify) | |
919 | wake_up(&stor_device->waiting_to_drain); | |
920 | ||
921 | ||
922 | } | |
923 | ||
924 | static void storvsc_on_receive(struct hv_device *device, | |
925 | struct vstor_packet *vstor_packet, | |
926 | struct hv_storvsc_request *request) | |
927 | { | |
12675799 S |
928 | struct storvsc_scan_work *work; |
929 | struct storvsc_device *stor_device; | |
930 | ||
8dcf37d4 S |
931 | switch (vstor_packet->operation) { |
932 | case VSTOR_OPERATION_COMPLETE_IO: | |
933 | storvsc_on_io_completion(device, vstor_packet, request); | |
934 | break; | |
12675799 | 935 | |
8dcf37d4 | 936 | case VSTOR_OPERATION_REMOVE_DEVICE: |
12675799 S |
937 | case VSTOR_OPERATION_ENUMERATE_BUS: |
938 | stor_device = get_in_stor_device(device); | |
939 | work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); | |
940 | if (!work) | |
941 | return; | |
942 | ||
943 | INIT_WORK(&work->work, storvsc_bus_scan); | |
944 | work->host = stor_device->host; | |
945 | schedule_work(&work->work); | |
946 | break; | |
8dcf37d4 S |
947 | |
948 | default: | |
949 | break; | |
950 | } | |
951 | } | |
952 | ||
953 | static void storvsc_on_channel_callback(void *context) | |
954 | { | |
955 | struct hv_device *device = (struct hv_device *)context; | |
956 | struct storvsc_device *stor_device; | |
957 | u32 bytes_recvd; | |
958 | u64 request_id; | |
959 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; | |
960 | struct hv_storvsc_request *request; | |
961 | int ret; | |
962 | ||
963 | ||
964 | stor_device = get_in_stor_device(device); | |
965 | if (!stor_device) | |
966 | return; | |
967 | ||
968 | do { | |
969 | ret = vmbus_recvpacket(device->channel, packet, | |
970 | ALIGN(sizeof(struct vstor_packet), 8), | |
971 | &bytes_recvd, &request_id); | |
972 | if (ret == 0 && bytes_recvd > 0) { | |
973 | ||
974 | request = (struct hv_storvsc_request *) | |
975 | (unsigned long)request_id; | |
976 | ||
977 | if ((request == &stor_device->init_request) || | |
978 | (request == &stor_device->reset_request)) { | |
979 | ||
980 | memcpy(&request->vstor_packet, packet, | |
981 | sizeof(struct vstor_packet)); | |
982 | complete(&request->wait_event); | |
983 | } else { | |
984 | storvsc_on_receive(device, | |
985 | (struct vstor_packet *)packet, | |
986 | request); | |
987 | } | |
988 | } else { | |
989 | break; | |
990 | } | |
991 | } while (1); | |
992 | ||
993 | return; | |
994 | } | |
995 | ||
996 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) | |
997 | { | |
998 | struct vmstorage_channel_properties props; | |
999 | int ret; | |
1000 | ||
1001 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); | |
1002 | ||
8dcf37d4 S |
1003 | ret = vmbus_open(device->channel, |
1004 | ring_size, | |
1005 | ring_size, | |
1006 | (void *)&props, | |
1007 | sizeof(struct vmstorage_channel_properties), | |
1008 | storvsc_on_channel_callback, device); | |
1009 | ||
1010 | if (ret != 0) | |
1011 | return ret; | |
1012 | ||
1013 | ret = storvsc_channel_init(device); | |
1014 | ||
1015 | return ret; | |
1016 | } | |
1017 | ||
c1b3d067 | 1018 | static int storvsc_dev_remove(struct hv_device *device) |
8dcf37d4 S |
1019 | { |
1020 | struct storvsc_device *stor_device; | |
1021 | unsigned long flags; | |
1022 | ||
cd654ea1 | 1023 | stor_device = hv_get_drvdata(device); |
8dcf37d4 S |
1024 | |
1025 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
1026 | stor_device->destroy = true; | |
1027 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
1028 | ||
1029 | /* | |
1030 | * At this point, all outbound traffic should be disable. We | |
1031 | * only allow inbound traffic (responses) to proceed so that | |
1032 | * outstanding requests can be completed. | |
1033 | */ | |
1034 | ||
1035 | storvsc_wait_to_drain(stor_device); | |
1036 | ||
1037 | /* | |
1038 | * Since we have already drained, we don't need to busy wait | |
1039 | * as was done in final_release_stor_device() | |
1040 | * Note that we cannot set the ext pointer to NULL until | |
1041 | * we have drained - to drain the outgoing packets, we need to | |
1042 | * allow incoming packets. | |
1043 | */ | |
1044 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
cd654ea1 | 1045 | hv_set_drvdata(device, NULL); |
8dcf37d4 S |
1046 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
1047 | ||
1048 | /* Close the channel */ | |
1049 | vmbus_close(device->channel); | |
1050 | ||
1051 | kfree(stor_device); | |
1052 | return 0; | |
1053 | } | |
1054 | ||
c1b3d067 | 1055 | static int storvsc_do_io(struct hv_device *device, |
8dcf37d4 S |
1056 | struct hv_storvsc_request *request) |
1057 | { | |
1058 | struct storvsc_device *stor_device; | |
1059 | struct vstor_packet *vstor_packet; | |
1060 | int ret = 0; | |
1061 | ||
1062 | vstor_packet = &request->vstor_packet; | |
1063 | stor_device = get_out_stor_device(device); | |
1064 | ||
1065 | if (!stor_device) | |
1066 | return -ENODEV; | |
1067 | ||
1068 | ||
1069 | request->device = device; | |
1070 | ||
1071 | ||
1072 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; | |
1073 | ||
1074 | vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); | |
1075 | ||
1076 | ||
1077 | vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE; | |
1078 | ||
1079 | ||
1080 | vstor_packet->vm_srb.data_transfer_length = | |
1081 | request->data_buffer.len; | |
1082 | ||
1083 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; | |
1084 | ||
1085 | if (request->data_buffer.len) { | |
1086 | ret = vmbus_sendpacket_multipagebuffer(device->channel, | |
1087 | &request->data_buffer, | |
1088 | vstor_packet, | |
1089 | sizeof(struct vstor_packet), | |
1090 | (unsigned long)request); | |
1091 | } else { | |
1092 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
1093 | sizeof(struct vstor_packet), | |
1094 | (unsigned long)request, | |
1095 | VM_PKT_DATA_INBAND, | |
1096 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1097 | } | |
1098 | ||
1099 | if (ret != 0) | |
1100 | return ret; | |
1101 | ||
1102 | atomic_inc(&stor_device->num_outstanding_req); | |
1103 | ||
1104 | return ret; | |
1105 | } | |
1106 | ||
5b60acee S |
1107 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
1108 | { | |
ce3e301c S |
1109 | struct stor_mem_pools *memp; |
1110 | int number = STORVSC_MIN_BUF_NR; | |
1111 | ||
1112 | memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL); | |
1113 | if (!memp) | |
1114 | return -ENOMEM; | |
1115 | ||
1116 | memp->request_pool = | |
1117 | kmem_cache_create(dev_name(&sdevice->sdev_dev), | |
1118 | sizeof(struct storvsc_cmd_request), 0, | |
1119 | SLAB_HWCACHE_ALIGN, NULL); | |
1120 | ||
1121 | if (!memp->request_pool) | |
1122 | goto err0; | |
1123 | ||
1124 | memp->request_mempool = mempool_create(number, mempool_alloc_slab, | |
1125 | mempool_free_slab, | |
1126 | memp->request_pool); | |
1127 | ||
1128 | if (!memp->request_mempool) | |
1129 | goto err1; | |
1130 | ||
1131 | sdevice->hostdata = memp; | |
1132 | ||
5b60acee | 1133 | return 0; |
ce3e301c S |
1134 | |
1135 | err1: | |
1136 | kmem_cache_destroy(memp->request_pool); | |
1137 | ||
1138 | err0: | |
1139 | kfree(memp); | |
1140 | return -ENOMEM; | |
1141 | } | |
1142 | ||
1143 | static void storvsc_device_destroy(struct scsi_device *sdevice) | |
1144 | { | |
1145 | struct stor_mem_pools *memp = sdevice->hostdata; | |
1146 | ||
1147 | mempool_destroy(memp->request_mempool); | |
1148 | kmem_cache_destroy(memp->request_pool); | |
1149 | kfree(memp); | |
1150 | sdevice->hostdata = NULL; | |
5b60acee S |
1151 | } |
1152 | ||
419f2d03 S |
1153 | static int storvsc_device_configure(struct scsi_device *sdevice) |
1154 | { | |
1155 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
1156 | STORVSC_MAX_IO_REQUESTS); | |
1157 | ||
419f2d03 S |
1158 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
1159 | ||
419f2d03 | 1160 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); |
419f2d03 S |
1161 | |
1162 | return 0; | |
1163 | } | |
1164 | ||
62838ce2 S |
1165 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
1166 | sector_t capacity, int *info) | |
1167 | { | |
5326fd5c S |
1168 | sector_t nsect = capacity; |
1169 | sector_t cylinders = nsect; | |
1170 | int heads, sectors_pt; | |
62838ce2 | 1171 | |
5326fd5c S |
1172 | /* |
1173 | * We are making up these values; let us keep it simple. | |
1174 | */ | |
1175 | heads = 0xff; | |
1176 | sectors_pt = 0x3f; /* Sectors per track */ | |
1177 | sector_div(cylinders, heads * sectors_pt); | |
1178 | if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) | |
1179 | cylinders = 0xffff; | |
62838ce2 S |
1180 | |
1181 | info[0] = heads; | |
5326fd5c S |
1182 | info[1] = sectors_pt; |
1183 | info[2] = (int)cylinders; | |
62838ce2 | 1184 | |
62838ce2 S |
1185 | return 0; |
1186 | } | |
aa3d789e | 1187 | |
4b270c8b | 1188 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
aa3d789e | 1189 | { |
4b270c8b S |
1190 | struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
1191 | struct hv_device *device = host_dev->dev; | |
1192 | ||
aa3d789e S |
1193 | struct storvsc_device *stor_device; |
1194 | struct hv_storvsc_request *request; | |
1195 | struct vstor_packet *vstor_packet; | |
1196 | int ret, t; | |
1197 | ||
aa3d789e | 1198 | |
1eaaddf9 | 1199 | stor_device = get_out_stor_device(device); |
aa3d789e | 1200 | if (!stor_device) |
a00e8224 | 1201 | return FAILED; |
aa3d789e S |
1202 | |
1203 | request = &stor_device->reset_request; | |
1204 | vstor_packet = &request->vstor_packet; | |
1205 | ||
1206 | init_completion(&request->wait_event); | |
1207 | ||
1208 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
1209 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
1210 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
1211 | ||
1212 | ret = vmbus_sendpacket(device->channel, vstor_packet, | |
1213 | sizeof(struct vstor_packet), | |
1214 | (unsigned long)&stor_device->reset_request, | |
1215 | VM_PKT_DATA_INBAND, | |
1216 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
1217 | if (ret != 0) | |
a00e8224 | 1218 | return FAILED; |
aa3d789e | 1219 | |
46d2eb6d | 1220 | t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
a00e8224 S |
1221 | if (t == 0) |
1222 | return TIMEOUT_ERROR; | |
aa3d789e | 1223 | |
aa3d789e S |
1224 | |
1225 | /* | |
1226 | * At this point, all outstanding requests in the adapter | |
1227 | * should have been flushed out and return to us | |
1228 | */ | |
1229 | ||
a00e8224 | 1230 | return SUCCESS; |
aa3d789e S |
1231 | } |
1232 | ||
c77b63b6 | 1233 | static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
92ae4ebd OH |
1234 | { |
1235 | bool allowed = true; | |
1236 | u8 scsi_op = scmnd->cmnd[0]; | |
1237 | ||
1238 | switch (scsi_op) { | |
c77b63b6 S |
1239 | /* |
1240 | * smartd sends this command and the host does not handle | |
1241 | * this. So, don't send it. | |
1242 | */ | |
41098f8f | 1243 | case SET_WINDOW: |
59e00e74 | 1244 | scmnd->result = ILLEGAL_REQUEST << 16; |
41098f8f S |
1245 | allowed = false; |
1246 | break; | |
1247 | default: | |
1248 | break; | |
92ae4ebd OH |
1249 | } |
1250 | return allowed; | |
1251 | } | |
c5b463ae | 1252 | |
bab445e1 | 1253 | static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
c5b463ae S |
1254 | { |
1255 | int ret; | |
bab445e1 | 1256 | struct hv_host_device *host_dev = shost_priv(host); |
c5b463ae | 1257 | struct hv_device *dev = host_dev->dev; |
c5b463ae S |
1258 | struct hv_storvsc_request *request; |
1259 | struct storvsc_cmd_request *cmd_request; | |
1260 | unsigned int request_size = 0; | |
1261 | int i; | |
1262 | struct scatterlist *sgl; | |
1263 | unsigned int sg_count = 0; | |
1264 | struct vmscsi_request *vm_srb; | |
ce3e301c | 1265 | struct stor_mem_pools *memp = scmnd->device->hostdata; |
c5b463ae | 1266 | |
c77b63b6 | 1267 | if (!storvsc_scsi_cmd_ok(scmnd)) { |
bab445e1 | 1268 | scmnd->scsi_done(scmnd); |
92ae4ebd OH |
1269 | return 0; |
1270 | } | |
c5b463ae | 1271 | |
c5b463ae S |
1272 | request_size = sizeof(struct storvsc_cmd_request); |
1273 | ||
ce3e301c | 1274 | cmd_request = mempool_alloc(memp->request_mempool, |
c5b463ae | 1275 | GFP_ATOMIC); |
c77b63b6 S |
1276 | |
1277 | /* | |
1278 | * We might be invoked in an interrupt context; hence | |
1279 | * mempool_alloc() can fail. | |
1280 | */ | |
bab445e1 | 1281 | if (!cmd_request) |
c5b463ae | 1282 | return SCSI_MLQUEUE_DEVICE_BUSY; |
bab445e1 | 1283 | |
4e03e697 | 1284 | memset(cmd_request, 0, sizeof(struct storvsc_cmd_request)); |
c5b463ae S |
1285 | |
1286 | /* Setup the cmd request */ | |
c5b463ae S |
1287 | cmd_request->cmd = scmnd; |
1288 | ||
1289 | scmnd->host_scribble = (unsigned char *)cmd_request; | |
1290 | ||
1291 | request = &cmd_request->request; | |
1292 | vm_srb = &request->vstor_packet.vm_srb; | |
1293 | ||
1294 | ||
1295 | /* Build the SRB */ | |
1296 | switch (scmnd->sc_data_direction) { | |
1297 | case DMA_TO_DEVICE: | |
1298 | vm_srb->data_in = WRITE_TYPE; | |
1299 | break; | |
1300 | case DMA_FROM_DEVICE: | |
1301 | vm_srb->data_in = READ_TYPE; | |
1302 | break; | |
1303 | default: | |
1304 | vm_srb->data_in = UNKNOWN_TYPE; | |
1305 | break; | |
1306 | } | |
1307 | ||
93a1bf4d | 1308 | request->cmd = cmd_request; |
c5b463ae | 1309 | |
c5b463ae S |
1310 | vm_srb->port_number = host_dev->port; |
1311 | vm_srb->path_id = scmnd->device->channel; | |
1312 | vm_srb->target_id = scmnd->device->id; | |
1313 | vm_srb->lun = scmnd->device->lun; | |
1314 | ||
c5b463ae S |
1315 | vm_srb->cdb_length = scmnd->cmd_len; |
1316 | ||
1317 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
1318 | ||
1319 | request->sense_buffer = scmnd->sense_buffer; | |
1320 | ||
1321 | ||
1322 | request->data_buffer.len = scsi_bufflen(scmnd); | |
1323 | if (scsi_sg_count(scmnd)) { | |
1324 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
1325 | sg_count = scsi_sg_count(scmnd); | |
1326 | ||
1327 | /* check if we need to bounce the sgl */ | |
1328 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { | |
1329 | cmd_request->bounce_sgl = | |
1330 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
6e8087a4 S |
1331 | scsi_bufflen(scmnd), |
1332 | vm_srb->data_in); | |
c5b463ae | 1333 | if (!cmd_request->bounce_sgl) { |
c77b63b6 S |
1334 | ret = SCSI_MLQUEUE_HOST_BUSY; |
1335 | goto queue_error; | |
c5b463ae S |
1336 | } |
1337 | ||
1338 | cmd_request->bounce_sgl_count = | |
1339 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> | |
1340 | PAGE_SHIFT; | |
1341 | ||
fa23b8c7 S |
1342 | if (vm_srb->data_in == WRITE_TYPE) |
1343 | copy_to_bounce_buffer(sgl, | |
1344 | cmd_request->bounce_sgl, | |
1345 | scsi_sg_count(scmnd)); | |
c5b463ae S |
1346 | |
1347 | sgl = cmd_request->bounce_sgl; | |
1348 | sg_count = cmd_request->bounce_sgl_count; | |
1349 | } | |
1350 | ||
1351 | request->data_buffer.offset = sgl[0].offset; | |
1352 | ||
1353 | for (i = 0; i < sg_count; i++) | |
1354 | request->data_buffer.pfn_array[i] = | |
1355 | page_to_pfn(sg_page((&sgl[i]))); | |
1356 | ||
1357 | } else if (scsi_sglist(scmnd)) { | |
c5b463ae S |
1358 | request->data_buffer.offset = |
1359 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
1360 | request->data_buffer.pfn_array[0] = | |
1361 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
1362 | } | |
1363 | ||
c5b463ae | 1364 | /* Invokes the vsc to start an IO */ |
636f0fd1 S |
1365 | ret = storvsc_do_io(dev, &cmd_request->request); |
1366 | ||
d2598f01 | 1367 | if (ret == -EAGAIN) { |
c5b463ae S |
1368 | /* no more space */ |
1369 | ||
c77b63b6 | 1370 | if (cmd_request->bounce_sgl_count) { |
c5b463ae | 1371 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
70691ec6 | 1372 | cmd_request->bounce_sgl_count); |
c5b463ae | 1373 | |
c77b63b6 S |
1374 | ret = SCSI_MLQUEUE_DEVICE_BUSY; |
1375 | goto queue_error; | |
1376 | } | |
c5b463ae S |
1377 | } |
1378 | ||
c77b63b6 S |
1379 | return 0; |
1380 | ||
1381 | queue_error: | |
1382 | mempool_free(cmd_request, memp->request_mempool); | |
1383 | scmnd->host_scribble = NULL; | |
c5b463ae S |
1384 | return ret; |
1385 | } | |
1386 | ||
bef4a34a | 1387 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
1388 | .module = THIS_MODULE, |
1389 | .name = "storvsc_host_t", | |
1390 | .bios_param = storvsc_get_chs, | |
1391 | .queuecommand = storvsc_queuecommand, | |
1392 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
1393 | .slave_alloc = storvsc_device_alloc, | |
ce3e301c | 1394 | .slave_destroy = storvsc_device_destroy, |
ff568d3a GKH |
1395 | .slave_configure = storvsc_device_configure, |
1396 | .cmd_per_lun = 1, | |
1397 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 1398 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 1399 | .this_id = -1, |
454f18a9 | 1400 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
1401 | /* currently 32 */ |
1402 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
039db52d | 1403 | .use_clustering = DISABLE_CLUSTERING, |
454f18a9 | 1404 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 1405 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
1406 | }; |
1407 | ||
ef52a81b S |
1408 | enum { |
1409 | SCSI_GUID, | |
1410 | IDE_GUID, | |
1411 | }; | |
1412 | ||
d847b5fe | 1413 | static const struct hv_vmbus_device_id id_table[] = { |
c45cf2d4 GKH |
1414 | /* SCSI guid */ |
1415 | { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, | |
ef52a81b S |
1416 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) |
1417 | .driver_data = SCSI_GUID }, | |
21e37742 S |
1418 | /* IDE guid */ |
1419 | { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, | |
ef52a81b S |
1420 | 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) |
1421 | .driver_data = IDE_GUID }, | |
c45cf2d4 | 1422 | { }, |
d847b5fe | 1423 | }; |
bef4a34a | 1424 | |
d847b5fe | 1425 | MODULE_DEVICE_TABLE(vmbus, id_table); |
bd1f5d6a | 1426 | |
84946899 S |
1427 | static int storvsc_probe(struct hv_device *device, |
1428 | const struct hv_vmbus_device_id *dev_id) | |
bef4a34a | 1429 | { |
ff568d3a | 1430 | int ret; |
bef4a34a | 1431 | struct Scsi_Host *host; |
795b613d | 1432 | struct hv_host_device *host_dev; |
ef52a81b | 1433 | bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
bd1f5d6a | 1434 | int target = 0; |
6e4198ce | 1435 | struct storvsc_device *stor_device; |
bd1f5d6a | 1436 | |
ff568d3a | 1437 | host = scsi_host_alloc(&scsi_driver, |
972621c9 | 1438 | sizeof(struct hv_host_device)); |
f8feed06 | 1439 | if (!host) |
bef4a34a | 1440 | return -ENOMEM; |
bef4a34a | 1441 | |
7f33f30a | 1442 | host_dev = shost_priv(host); |
795b613d | 1443 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
bef4a34a | 1444 | |
795b613d | 1445 | host_dev->port = host->host_no; |
97c15296 | 1446 | host_dev->dev = device; |
bef4a34a | 1447 | |
4e03e697 | 1448 | |
a13d35ab | 1449 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
6e4198ce | 1450 | if (!stor_device) { |
225ce6ea | 1451 | ret = -ENOMEM; |
ce3e301c | 1452 | goto err_out0; |
6e4198ce | 1453 | } |
9efd21e1 | 1454 | |
a13d35ab S |
1455 | stor_device->destroy = false; |
1456 | init_waitqueue_head(&stor_device->waiting_to_drain); | |
1457 | stor_device->device = device; | |
cd654ea1 S |
1458 | stor_device->host = host; |
1459 | hv_set_drvdata(device, stor_device); | |
a13d35ab | 1460 | |
6e4198ce S |
1461 | stor_device->port_number = host->host_no; |
1462 | ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); | |
225ce6ea | 1463 | if (ret) |
ce3e301c | 1464 | goto err_out1; |
bef4a34a | 1465 | |
6e4198ce S |
1466 | host_dev->path = stor_device->path_id; |
1467 | host_dev->target = stor_device->target_id; | |
bef4a34a | 1468 | |
ff568d3a GKH |
1469 | /* max # of devices per target */ |
1470 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
1471 | /* max # of targets per channel */ | |
1472 | host->max_id = STORVSC_MAX_TARGETS; | |
1473 | /* max # of channels */ | |
1474 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
cf55f4a8 MS |
1475 | /* max cmd length */ |
1476 | host->max_cmd_len = STORVSC_MAX_CMD_LEN; | |
bef4a34a | 1477 | |
454f18a9 | 1478 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 1479 | ret = scsi_add_host(host, &device->device); |
bd1f5d6a | 1480 | if (ret != 0) |
ce3e301c | 1481 | goto err_out2; |
bef4a34a | 1482 | |
bd1f5d6a S |
1483 | if (!dev_is_ide) { |
1484 | scsi_scan_host(host); | |
59d22950 S |
1485 | } else { |
1486 | target = (device->dev_instance.b[5] << 8 | | |
1487 | device->dev_instance.b[4]); | |
1488 | ret = scsi_add_device(host, 0, target, 0); | |
1489 | if (ret) { | |
1490 | scsi_remove_host(host); | |
1491 | goto err_out2; | |
1492 | } | |
bef4a34a | 1493 | } |
bd1f5d6a | 1494 | return 0; |
bef4a34a | 1495 | |
ce3e301c | 1496 | err_out2: |
225ce6ea S |
1497 | /* |
1498 | * Once we have connected with the host, we would need to | |
1499 | * to invoke storvsc_dev_remove() to rollback this state and | |
1500 | * this call also frees up the stor_device; hence the jump around | |
ce3e301c | 1501 | * err_out1 label. |
225ce6ea | 1502 | */ |
bd1f5d6a | 1503 | storvsc_dev_remove(device); |
ce3e301c | 1504 | goto err_out0; |
225ce6ea S |
1505 | |
1506 | err_out1: | |
ce3e301c | 1507 | kfree(stor_device); |
225ce6ea S |
1508 | |
1509 | err_out0: | |
bd1f5d6a | 1510 | scsi_host_put(host); |
225ce6ea | 1511 | return ret; |
bef4a34a HJ |
1512 | } |
1513 | ||
ddcbf65e S |
1514 | static int storvsc_remove(struct hv_device *dev) |
1515 | { | |
1516 | struct storvsc_device *stor_device = hv_get_drvdata(dev); | |
1517 | struct Scsi_Host *host = stor_device->host; | |
1518 | ||
1519 | scsi_remove_host(host); | |
1520 | storvsc_dev_remove(dev); | |
1521 | scsi_host_put(host); | |
1522 | ||
1523 | return 0; | |
1524 | } | |
1525 | ||
40bf63ed | 1526 | static struct hv_driver storvsc_drv = { |
fafb0efc | 1527 | .name = KBUILD_MODNAME, |
d847b5fe | 1528 | .id_table = id_table, |
40bf63ed S |
1529 | .probe = storvsc_probe, |
1530 | .remove = storvsc_remove, | |
39ae6fae | 1531 | }; |
7bd05b91 | 1532 | |
d9bbae83 | 1533 | static int __init storvsc_drv_init(void) |
f5c78872 | 1534 | { |
01415ab3 S |
1535 | u32 max_outstanding_req_per_channel; |
1536 | ||
1537 | /* | |
1538 | * Divide the ring buffer data size (which is 1 page less | |
1539 | * than the ring buffer size since that page is reserved for | |
1540 | * the ring buffer indices) by the max request size (which is | |
1541 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
1542 | */ | |
01415ab3 | 1543 | max_outstanding_req_per_channel = |
768fa219 GKH |
1544 | ((storvsc_ringbuffer_size - PAGE_SIZE) / |
1545 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
1546 | sizeof(struct vstor_packet) + sizeof(u64), | |
1547 | sizeof(u64))); | |
f5c78872 | 1548 | |
01415ab3 | 1549 | if (max_outstanding_req_per_channel < |
f5c78872 | 1550 | STORVSC_MAX_IO_REQUESTS) |
b06efc19 | 1551 | return -EINVAL; |
f5c78872 | 1552 | |
768fa219 | 1553 | return vmbus_driver_register(&storvsc_drv); |
f5c78872 S |
1554 | } |
1555 | ||
c63ba9e1 | 1556 | static void __exit storvsc_drv_exit(void) |
f5c78872 | 1557 | { |
768fa219 | 1558 | vmbus_driver_unregister(&storvsc_drv); |
f5c78872 S |
1559 | } |
1560 | ||
ff568d3a | 1561 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1562 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 1563 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
d9bbae83 | 1564 | module_init(storvsc_drv_init); |
c63ba9e1 | 1565 | module_exit(storvsc_drv_exit); |