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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> | |
1f91bca8 S |
20 | * |
21 | * 4/3/2011: K. Y. Srinivasan - Significant restructuring and cleanup. | |
bef4a34a | 22 | */ |
5654e932 | 23 | #include <linux/kernel.h> |
0c3b7b2f | 24 | #include <linux/sched.h> |
93958465 | 25 | #include <linux/completion.h> |
0ffa63b0 | 26 | #include <linux/string.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
0ffa63b0 | 28 | #include <linux/mm.h> |
b4362c9c | 29 | #include <linux/delay.h> |
e3fe0bb6 | 30 | #include "hv_api.h" |
645954c5 | 31 | #include "logging.h" |
bb969793 | 32 | #include "storvsc_api.h" |
f8e5add2 | 33 | #include "vmbus_packet_format.h" |
2dd88b51 | 34 | #include "vstorage.h" |
50ea95df | 35 | #include "channel.h" |
bef4a34a HJ |
36 | |
37 | ||
f638859e | 38 | static inline struct storvsc_device *alloc_stor_device(struct hv_device *device) |
bef4a34a | 39 | { |
f638859e | 40 | struct storvsc_device *stor_device; |
bef4a34a | 41 | |
f638859e HJ |
42 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
43 | if (!stor_device) | |
bef4a34a HJ |
44 | return NULL; |
45 | ||
454f18a9 | 46 | /* Set to 2 to allow both inbound and outbound traffics */ |
3d8cdf22 | 47 | /* (ie get_stor_device() and must_get_stor_device()) to proceed. */ |
f638859e | 48 | atomic_cmpxchg(&stor_device->ref_count, 0, 2); |
bef4a34a | 49 | |
604df37d | 50 | init_waitqueue_head(&stor_device->waiting_to_drain); |
f638859e | 51 | stor_device->device = device; |
ca623ad3 | 52 | device->ext = stor_device; |
bef4a34a | 53 | |
f638859e | 54 | return stor_device; |
bef4a34a HJ |
55 | } |
56 | ||
f638859e | 57 | static inline void free_stor_device(struct storvsc_device *device) |
bef4a34a | 58 | { |
f638859e | 59 | kfree(device); |
bef4a34a HJ |
60 | } |
61 | ||
454f18a9 | 62 | /* Get the stordevice object iff exists and its refcount > 0 */ |
02e37db7 | 63 | static inline struct storvsc_device *must_get_stor_device( |
f638859e | 64 | struct hv_device *device) |
bef4a34a | 65 | { |
f638859e | 66 | struct storvsc_device *stor_device; |
bef4a34a | 67 | |
ca623ad3 | 68 | stor_device = (struct storvsc_device *)device->ext; |
f638859e HJ |
69 | if (stor_device && atomic_read(&stor_device->ref_count)) |
70 | atomic_inc(&stor_device->ref_count); | |
bef4a34a | 71 | else |
f638859e | 72 | stor_device = NULL; |
bef4a34a | 73 | |
f638859e | 74 | return stor_device; |
bef4a34a HJ |
75 | } |
76 | ||
02e37db7 HJ |
77 | /* Drop ref count to 1 to effectively disable get_stor_device() */ |
78 | static inline struct storvsc_device *release_stor_device( | |
f638859e | 79 | struct hv_device *device) |
bef4a34a | 80 | { |
f638859e | 81 | struct storvsc_device *stor_device; |
bef4a34a | 82 | |
ca623ad3 | 83 | stor_device = (struct storvsc_device *)device->ext; |
bef4a34a | 84 | |
454f18a9 | 85 | /* Busy wait until the ref drop to 2, then set it to 1 */ |
f638859e | 86 | while (atomic_cmpxchg(&stor_device->ref_count, 2, 1) != 2) |
b4362c9c | 87 | udelay(100); |
bef4a34a | 88 | |
f638859e | 89 | return stor_device; |
bef4a34a HJ |
90 | } |
91 | ||
f638859e | 92 | /* Drop ref count to 0. No one can use stor_device object. */ |
02e37db7 | 93 | static inline struct storvsc_device *final_release_stor_device( |
f638859e | 94 | struct hv_device *device) |
bef4a34a | 95 | { |
f638859e | 96 | struct storvsc_device *stor_device; |
bef4a34a | 97 | |
ca623ad3 | 98 | stor_device = (struct storvsc_device *)device->ext; |
bef4a34a | 99 | |
454f18a9 | 100 | /* Busy wait until the ref drop to 1, then set it to 0 */ |
f638859e | 101 | while (atomic_cmpxchg(&stor_device->ref_count, 1, 0) != 1) |
b4362c9c | 102 | udelay(100); |
bef4a34a | 103 | |
ca623ad3 | 104 | device->ext = NULL; |
f638859e | 105 | return stor_device; |
bef4a34a HJ |
106 | } |
107 | ||
f638859e | 108 | static int stor_vsc_channel_init(struct hv_device *device) |
bef4a34a | 109 | { |
f638859e | 110 | struct storvsc_device *stor_device; |
d7a1bdb9 | 111 | struct hv_storvsc_request *request; |
f638859e | 112 | struct vstor_packet *vstor_packet; |
93958465 | 113 | int ret, t; |
bef4a34a | 114 | |
f638859e HJ |
115 | stor_device = get_stor_device(device); |
116 | if (!stor_device) { | |
068c5df2 GKH |
117 | DPRINT_ERR(STORVSC, "unable to get stor device..." |
118 | "device being destroyed?"); | |
bef4a34a HJ |
119 | return -1; |
120 | } | |
121 | ||
f638859e HJ |
122 | request = &stor_device->init_request; |
123 | vstor_packet = &request->vstor_packet; | |
bef4a34a | 124 | |
068c5df2 GKH |
125 | /* |
126 | * Now, initiate the vsc/vsp initialization protocol on the open | |
127 | * channel | |
128 | */ | |
d7a1bdb9 | 129 | memset(request, 0, sizeof(struct hv_storvsc_request)); |
93958465 | 130 | init_completion(&request->wait_event); |
f638859e HJ |
131 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; |
132 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
bef4a34a | 133 | |
bef4a34a HJ |
134 | DPRINT_INFO(STORVSC, "BEGIN_INITIALIZATION_OPERATION..."); |
135 | ||
f638859e | 136 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
b60d71e2 GKH |
137 | sizeof(struct vstor_packet), |
138 | (unsigned long)request, | |
415f2287 | 139 | VM_PKT_DATA_INBAND, |
b60d71e2 | 140 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
068c5df2 GKH |
141 | if (ret != 0) { |
142 | DPRINT_ERR(STORVSC, | |
143 | "unable to send BEGIN_INITIALIZATION_OPERATION"); | |
0c3b7b2f S |
144 | goto cleanup; |
145 | } | |
146 | ||
93958465 S |
147 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
148 | if (t == 0) { | |
0c3b7b2f S |
149 | ret = -ETIMEDOUT; |
150 | goto cleanup; | |
bef4a34a HJ |
151 | } |
152 | ||
f638859e HJ |
153 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
154 | vstor_packet->status != 0) { | |
068c5df2 GKH |
155 | DPRINT_ERR(STORVSC, "BEGIN_INITIALIZATION_OPERATION failed " |
156 | "(op %d status 0x%x)", | |
f638859e | 157 | vstor_packet->operation, vstor_packet->status); |
0c3b7b2f | 158 | goto cleanup; |
bef4a34a HJ |
159 | } |
160 | ||
161 | DPRINT_INFO(STORVSC, "QUERY_PROTOCOL_VERSION_OPERATION..."); | |
162 | ||
454f18a9 | 163 | /* reuse the packet for version range supported */ |
f638859e HJ |
164 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
165 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
166 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
bef4a34a | 167 | |
f638859e HJ |
168 | vstor_packet->version.major_minor = VMSTOR_PROTOCOL_VERSION_CURRENT; |
169 | FILL_VMSTOR_REVISION(vstor_packet->version.revision); | |
bef4a34a | 170 | |
f638859e | 171 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
b60d71e2 GKH |
172 | sizeof(struct vstor_packet), |
173 | (unsigned long)request, | |
415f2287 | 174 | VM_PKT_DATA_INBAND, |
b60d71e2 | 175 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
068c5df2 GKH |
176 | if (ret != 0) { |
177 | DPRINT_ERR(STORVSC, | |
178 | "unable to send BEGIN_INITIALIZATION_OPERATION"); | |
0c3b7b2f | 179 | goto cleanup; |
bef4a34a HJ |
180 | } |
181 | ||
93958465 S |
182 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
183 | if (t == 0) { | |
0c3b7b2f S |
184 | ret = -ETIMEDOUT; |
185 | goto cleanup; | |
186 | } | |
bef4a34a | 187 | |
454f18a9 | 188 | /* TODO: Check returned version */ |
f638859e HJ |
189 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
190 | vstor_packet->status != 0) { | |
068c5df2 GKH |
191 | DPRINT_ERR(STORVSC, "QUERY_PROTOCOL_VERSION_OPERATION failed " |
192 | "(op %d status 0x%x)", | |
f638859e | 193 | vstor_packet->operation, vstor_packet->status); |
0c3b7b2f | 194 | goto cleanup; |
bef4a34a HJ |
195 | } |
196 | ||
454f18a9 | 197 | /* Query channel properties */ |
bef4a34a HJ |
198 | DPRINT_INFO(STORVSC, "QUERY_PROPERTIES_OPERATION..."); |
199 | ||
f638859e HJ |
200 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
201 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
202 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
203 | vstor_packet->storage_channel_properties.port_number = | |
204 | stor_device->port_number; | |
bef4a34a | 205 | |
f638859e | 206 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
b60d71e2 GKH |
207 | sizeof(struct vstor_packet), |
208 | (unsigned long)request, | |
415f2287 | 209 | VM_PKT_DATA_INBAND, |
b60d71e2 | 210 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
068c5df2 GKH |
211 | |
212 | if (ret != 0) { | |
213 | DPRINT_ERR(STORVSC, | |
214 | "unable to send QUERY_PROPERTIES_OPERATION"); | |
0c3b7b2f | 215 | goto cleanup; |
bef4a34a HJ |
216 | } |
217 | ||
93958465 S |
218 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
219 | if (t == 0) { | |
0c3b7b2f S |
220 | ret = -ETIMEDOUT; |
221 | goto cleanup; | |
222 | } | |
bef4a34a | 223 | |
454f18a9 | 224 | /* TODO: Check returned version */ |
f638859e HJ |
225 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
226 | vstor_packet->status != 0) { | |
068c5df2 GKH |
227 | DPRINT_ERR(STORVSC, "QUERY_PROPERTIES_OPERATION failed " |
228 | "(op %d status 0x%x)", | |
f638859e | 229 | vstor_packet->operation, vstor_packet->status); |
0c3b7b2f | 230 | goto cleanup; |
bef4a34a HJ |
231 | } |
232 | ||
f638859e HJ |
233 | stor_device->path_id = vstor_packet->storage_channel_properties.path_id; |
234 | stor_device->target_id | |
235 | = vstor_packet->storage_channel_properties.target_id; | |
bef4a34a | 236 | |
068c5df2 | 237 | DPRINT_DBG(STORVSC, "channel flag 0x%x, max xfer len 0x%x", |
f638859e HJ |
238 | vstor_packet->storage_channel_properties.flags, |
239 | vstor_packet->storage_channel_properties.max_transfer_bytes); | |
bef4a34a HJ |
240 | |
241 | DPRINT_INFO(STORVSC, "END_INITIALIZATION_OPERATION..."); | |
242 | ||
f638859e HJ |
243 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
244 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
245 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
bef4a34a | 246 | |
f638859e | 247 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
b60d71e2 GKH |
248 | sizeof(struct vstor_packet), |
249 | (unsigned long)request, | |
415f2287 | 250 | VM_PKT_DATA_INBAND, |
b60d71e2 | 251 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
068c5df2 GKH |
252 | |
253 | if (ret != 0) { | |
254 | DPRINT_ERR(STORVSC, | |
255 | "unable to send END_INITIALIZATION_OPERATION"); | |
0c3b7b2f | 256 | goto cleanup; |
bef4a34a HJ |
257 | } |
258 | ||
93958465 S |
259 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
260 | if (t == 0) { | |
0c3b7b2f S |
261 | ret = -ETIMEDOUT; |
262 | goto cleanup; | |
263 | } | |
bef4a34a | 264 | |
f638859e HJ |
265 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
266 | vstor_packet->status != 0) { | |
068c5df2 GKH |
267 | DPRINT_ERR(STORVSC, "END_INITIALIZATION_OPERATION failed " |
268 | "(op %d status 0x%x)", | |
f638859e | 269 | vstor_packet->operation, vstor_packet->status); |
0c3b7b2f | 270 | goto cleanup; |
bef4a34a HJ |
271 | } |
272 | ||
273 | DPRINT_INFO(STORVSC, "**** storage channel up and running!! ****"); | |
274 | ||
0c3b7b2f | 275 | cleanup: |
f638859e | 276 | put_stor_device(device); |
bef4a34a HJ |
277 | return ret; |
278 | } | |
279 | ||
f638859e HJ |
280 | static void stor_vsc_on_io_completion(struct hv_device *device, |
281 | struct vstor_packet *vstor_packet, | |
d7a1bdb9 | 282 | struct hv_storvsc_request *request) |
163680b4 | 283 | { |
f638859e | 284 | struct storvsc_device *stor_device; |
a617e395 | 285 | struct vstor_packet *stor_pkt; |
163680b4 | 286 | |
f638859e HJ |
287 | stor_device = must_get_stor_device(device); |
288 | if (!stor_device) { | |
163680b4 GKH |
289 | DPRINT_ERR(STORVSC, "unable to get stor device..." |
290 | "device being destroyed?"); | |
163680b4 GKH |
291 | return; |
292 | } | |
293 | ||
a617e395 | 294 | DPRINT_DBG(STORVSC, "IO_COMPLETE_OPERATION - request %p " |
d7a1bdb9 | 295 | "completed bytes xfer %u", request, |
f638859e | 296 | vstor_packet->vm_srb.data_transfer_length); |
163680b4 | 297 | |
a617e395 | 298 | stor_pkt = &request->vstor_packet; |
163680b4 | 299 | |
163680b4 GKH |
300 | |
301 | /* Copy over the status...etc */ | |
a617e395 S |
302 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; |
303 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
304 | stor_pkt->vm_srb.sense_info_length = | |
305 | vstor_packet->vm_srb.sense_info_length; | |
163680b4 | 306 | |
6dc3f0a7 S |
307 | if (vstor_packet->vm_srb.scsi_status != 0 || |
308 | vstor_packet->vm_srb.srb_status != 1) { | |
163680b4 GKH |
309 | DPRINT_WARN(STORVSC, |
310 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
a617e395 | 311 | stor_pkt->vm_srb.cdb[0], |
373dd8a9 | 312 | vstor_packet->vm_srb.scsi_status, |
f638859e | 313 | vstor_packet->vm_srb.srb_status); |
163680b4 GKH |
314 | } |
315 | ||
6dc3f0a7 | 316 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { |
163680b4 | 317 | /* CHECK_CONDITION */ |
f638859e | 318 | if (vstor_packet->vm_srb.srb_status & 0x80) { |
163680b4 GKH |
319 | /* autosense data available */ |
320 | DPRINT_WARN(STORVSC, "storvsc pkt %p autosense data " | |
d7a1bdb9 | 321 | "valid - len %d\n", request, |
f638859e | 322 | vstor_packet->vm_srb.sense_info_length); |
163680b4 | 323 | |
d7a1bdb9 | 324 | memcpy(request->sense_buffer, |
f638859e HJ |
325 | vstor_packet->vm_srb.sense_data, |
326 | vstor_packet->vm_srb.sense_info_length); | |
163680b4 | 327 | |
163680b4 GKH |
328 | } |
329 | } | |
330 | ||
a617e395 S |
331 | stor_pkt->vm_srb.data_transfer_length = |
332 | vstor_packet->vm_srb.data_transfer_length; | |
163680b4 | 333 | |
d7a1bdb9 | 334 | request->on_io_completion(request); |
163680b4 | 335 | |
604df37d S |
336 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && |
337 | stor_device->drain_notify) | |
338 | wake_up(&stor_device->waiting_to_drain); | |
339 | ||
163680b4 | 340 | |
f638859e | 341 | put_stor_device(device); |
163680b4 GKH |
342 | } |
343 | ||
f638859e HJ |
344 | static void stor_vsc_on_receive(struct hv_device *device, |
345 | struct vstor_packet *vstor_packet, | |
d7a1bdb9 | 346 | struct hv_storvsc_request *request) |
163680b4 | 347 | { |
f638859e | 348 | switch (vstor_packet->operation) { |
d2aaba45 | 349 | case VSTOR_OPERATION_COMPLETE_IO: |
163680b4 | 350 | DPRINT_DBG(STORVSC, "IO_COMPLETE_OPERATION"); |
d7a1bdb9 | 351 | stor_vsc_on_io_completion(device, vstor_packet, request); |
163680b4 | 352 | break; |
d2aaba45 | 353 | case VSTOR_OPERATION_REMOVE_DEVICE: |
163680b4 GKH |
354 | DPRINT_INFO(STORVSC, "REMOVE_DEVICE_OPERATION"); |
355 | /* TODO: */ | |
356 | break; | |
357 | ||
358 | default: | |
359 | DPRINT_INFO(STORVSC, "Unknown operation received - %d", | |
f638859e | 360 | vstor_packet->operation); |
163680b4 GKH |
361 | break; |
362 | } | |
363 | } | |
364 | ||
02e37db7 | 365 | static void stor_vsc_on_channel_callback(void *context) |
163680b4 GKH |
366 | { |
367 | struct hv_device *device = (struct hv_device *)context; | |
f638859e HJ |
368 | struct storvsc_device *stor_device; |
369 | u32 bytes_recvd; | |
370 | u64 request_id; | |
73509681 | 371 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; |
d7a1bdb9 | 372 | struct hv_storvsc_request *request; |
163680b4 GKH |
373 | int ret; |
374 | ||
163680b4 | 375 | |
f638859e HJ |
376 | stor_device = must_get_stor_device(device); |
377 | if (!stor_device) { | |
163680b4 GKH |
378 | DPRINT_ERR(STORVSC, "unable to get stor device..." |
379 | "device being destroyed?"); | |
163680b4 GKH |
380 | return; |
381 | } | |
382 | ||
383 | do { | |
50ea95df | 384 | ret = vmbus_recvpacket(device->channel, packet, |
73509681 | 385 | ALIGN(sizeof(struct vstor_packet), 8), |
f638859e HJ |
386 | &bytes_recvd, &request_id); |
387 | if (ret == 0 && bytes_recvd > 0) { | |
163680b4 | 388 | DPRINT_DBG(STORVSC, "receive %d bytes - tid %llx", |
f638859e | 389 | bytes_recvd, request_id); |
163680b4 | 390 | |
163680b4 | 391 | |
d7a1bdb9 | 392 | request = (struct hv_storvsc_request *) |
f638859e | 393 | (unsigned long)request_id; |
163680b4 | 394 | |
f638859e HJ |
395 | if ((request == &stor_device->init_request) || |
396 | (request == &stor_device->reset_request)) { | |
163680b4 | 397 | |
3d8cdf22 | 398 | memcpy(&request->vstor_packet, packet, |
163680b4 | 399 | sizeof(struct vstor_packet)); |
93958465 | 400 | complete(&request->wait_event); |
163680b4 | 401 | } else { |
02e37db7 | 402 | stor_vsc_on_receive(device, |
163680b4 GKH |
403 | (struct vstor_packet *)packet, |
404 | request); | |
405 | } | |
406 | } else { | |
163680b4 GKH |
407 | break; |
408 | } | |
409 | } while (1); | |
410 | ||
02e37db7 | 411 | put_stor_device(device); |
163680b4 GKH |
412 | return; |
413 | } | |
414 | ||
f638859e | 415 | static int stor_vsc_connect_to_vsp(struct hv_device *device) |
bef4a34a | 416 | { |
b3715ee4 | 417 | struct vmstorage_channel_properties props; |
2e79505d | 418 | struct storvsc_driver *stor_driver; |
068c5df2 | 419 | int ret; |
bef4a34a | 420 | |
786930b3 | 421 | stor_driver = drv_to_stordrv(device->device.driver); |
8c960e49 | 422 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); |
bef4a34a | 423 | |
454f18a9 | 424 | /* Open the channel */ |
f638859e HJ |
425 | ret = vmbus_open(device->channel, |
426 | stor_driver->ring_buffer_size, | |
427 | stor_driver->ring_buffer_size, | |
60f841ac GKH |
428 | (void *)&props, |
429 | sizeof(struct vmstorage_channel_properties), | |
f638859e | 430 | stor_vsc_on_channel_callback, device); |
068c5df2 GKH |
431 | |
432 | DPRINT_DBG(STORVSC, "storage props: path id %d, tgt id %d, max xfer %d", | |
d2aaba45 | 433 | props.path_id, props.target_id, props.max_transfer_bytes); |
068c5df2 GKH |
434 | |
435 | if (ret != 0) { | |
bef4a34a HJ |
436 | DPRINT_ERR(STORVSC, "unable to open channel: %d", ret); |
437 | return -1; | |
438 | } | |
439 | ||
f638859e | 440 | ret = stor_vsc_channel_init(device); |
bef4a34a HJ |
441 | |
442 | return ret; | |
443 | } | |
444 | ||
3e189519 | 445 | /* |
02e37db7 | 446 | * stor_vsc_on_device_add - Callback when the device belonging to this driver |
3d8cdf22 | 447 | * is added |
163680b4 | 448 | */ |
2ac5dad1 | 449 | int storvsc_dev_add(struct hv_device *device, |
f638859e | 450 | void *additional_info) |
163680b4 | 451 | { |
f638859e | 452 | struct storvsc_device *stor_device; |
f638859e | 453 | struct storvsc_device_info *device_info; |
163680b4 GKH |
454 | int ret = 0; |
455 | ||
f638859e HJ |
456 | device_info = (struct storvsc_device_info *)additional_info; |
457 | stor_device = alloc_stor_device(device); | |
458 | if (!stor_device) { | |
163680b4 | 459 | ret = -1; |
0c3b7b2f | 460 | goto cleanup; |
163680b4 GKH |
461 | } |
462 | ||
463 | /* Save the channel properties to our storvsc channel */ | |
163680b4 GKH |
464 | |
465 | /* FIXME: */ | |
466 | /* | |
467 | * If we support more than 1 scsi channel, we need to set the | |
468 | * port number here to the scsi channel but how do we get the | |
469 | * scsi channel prior to the bus scan | |
470 | */ | |
471 | ||
f638859e | 472 | stor_device->port_number = device_info->port_number; |
163680b4 | 473 | /* Send it back up */ |
f638859e | 474 | ret = stor_vsc_connect_to_vsp(device); |
163680b4 | 475 | |
f638859e HJ |
476 | device_info->path_id = stor_device->path_id; |
477 | device_info->target_id = stor_device->target_id; | |
163680b4 GKH |
478 | |
479 | DPRINT_DBG(STORVSC, "assigned port %u, path %u target %u\n", | |
f638859e HJ |
480 | stor_device->port_number, stor_device->path_id, |
481 | stor_device->target_id); | |
163680b4 | 482 | |
0c3b7b2f | 483 | cleanup: |
163680b4 GKH |
484 | return ret; |
485 | } | |
bef4a34a | 486 | |
3e189519 | 487 | /* |
02e37db7 | 488 | * stor_vsc_on_device_remove - Callback when the our device is being removed |
068c5df2 | 489 | */ |
cb706b04 | 490 | int storvsc_dev_remove(struct hv_device *device) |
bef4a34a | 491 | { |
f638859e | 492 | struct storvsc_device *stor_device; |
bef4a34a | 493 | |
068c5df2 | 494 | DPRINT_INFO(STORVSC, "disabling storage device (%p)...", |
ca623ad3 | 495 | device->ext); |
bef4a34a | 496 | |
f638859e | 497 | stor_device = release_stor_device(device); |
bef4a34a | 498 | |
454f18a9 BP |
499 | /* |
500 | * At this point, all outbound traffic should be disable. We | |
501 | * only allow inbound traffic (responses) to proceed so that | |
502 | * outstanding requests can be completed. | |
503 | */ | |
f638859e | 504 | while (atomic_read(&stor_device->num_outstanding_req)) { |
068c5df2 | 505 | DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", |
f638859e | 506 | atomic_read(&stor_device->num_outstanding_req)); |
b4362c9c | 507 | udelay(100); |
bef4a34a HJ |
508 | } |
509 | ||
068c5df2 | 510 | DPRINT_INFO(STORVSC, "removing storage device (%p)...", |
ca623ad3 | 511 | device->ext); |
bef4a34a | 512 | |
f638859e | 513 | stor_device = final_release_stor_device(device); |
bef4a34a | 514 | |
f638859e | 515 | DPRINT_INFO(STORVSC, "storage device (%p) safe to remove", stor_device); |
bef4a34a | 516 | |
454f18a9 | 517 | /* Close the channel */ |
f638859e | 518 | vmbus_close(device->channel); |
bef4a34a | 519 | |
f638859e | 520 | free_stor_device(stor_device); |
068c5df2 | 521 | return 0; |
454f18a9 | 522 | } |
bef4a34a | 523 | |
3e189519 | 524 | /* |
02e37db7 | 525 | * stor_vsc_on_io_request - Callback to initiate an I/O request |
068c5df2 | 526 | */ |
bb465926 | 527 | int storvsc_do_io(struct hv_device *device, |
f638859e | 528 | struct hv_storvsc_request *request) |
bef4a34a | 529 | { |
f638859e | 530 | struct storvsc_device *stor_device; |
f638859e | 531 | struct vstor_packet *vstor_packet; |
068c5df2 | 532 | int ret = 0; |
bef4a34a | 533 | |
d7a1bdb9 | 534 | vstor_packet = &request->vstor_packet; |
f638859e | 535 | stor_device = get_stor_device(device); |
bef4a34a | 536 | |
068c5df2 | 537 | DPRINT_DBG(STORVSC, "enter - Device %p, DeviceExt %p, Request %p, " |
d7a1bdb9 | 538 | , device, stor_device, request); |
bef4a34a | 539 | |
473f9409 | 540 | DPRINT_DBG(STORVSC, "req %p len %d", |
d7a1bdb9 | 541 | request, request->data_buffer.len); |
bef4a34a | 542 | |
f638859e | 543 | if (!stor_device) { |
068c5df2 GKH |
544 | DPRINT_ERR(STORVSC, "unable to get stor device..." |
545 | "device being destroyed?"); | |
bef4a34a HJ |
546 | return -2; |
547 | } | |
548 | ||
bef4a34a | 549 | |
d7a1bdb9 | 550 | request->device = device; |
bef4a34a | 551 | |
a617e395 | 552 | |
f638859e | 553 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; |
bef4a34a | 554 | |
f638859e | 555 | vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); |
bef4a34a | 556 | |
bef4a34a | 557 | |
f638859e | 558 | vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE; |
bef4a34a | 559 | |
bef4a34a | 560 | |
e9e936c6 | 561 | vstor_packet->vm_srb.data_transfer_length = |
d7a1bdb9 | 562 | request->data_buffer.len; |
bef4a34a | 563 | |
f638859e | 564 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; |
bef4a34a | 565 | |
068c5df2 GKH |
566 | DPRINT_DBG(STORVSC, "srb - len %d port %d, path %d, target %d, " |
567 | "lun %d senselen %d cdblen %d", | |
f638859e HJ |
568 | vstor_packet->vm_srb.length, |
569 | vstor_packet->vm_srb.port_number, | |
570 | vstor_packet->vm_srb.path_id, | |
571 | vstor_packet->vm_srb.target_id, | |
572 | vstor_packet->vm_srb.lun, | |
573 | vstor_packet->vm_srb.sense_info_length, | |
574 | vstor_packet->vm_srb.cdb_length); | |
575 | ||
d7a1bdb9 | 576 | if (request->data_buffer.len) { |
f638859e | 577 | ret = vmbus_sendpacket_multipagebuffer(device->channel, |
d7a1bdb9 | 578 | &request->data_buffer, |
f638859e | 579 | vstor_packet, |
b3715ee4 | 580 | sizeof(struct vstor_packet), |
d7a1bdb9 | 581 | (unsigned long)request); |
068c5df2 | 582 | } else { |
f638859e | 583 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
b60d71e2 | 584 | sizeof(struct vstor_packet), |
d7a1bdb9 | 585 | (unsigned long)request, |
415f2287 | 586 | VM_PKT_DATA_INBAND, |
b60d71e2 | 587 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
bef4a34a HJ |
588 | } |
589 | ||
068c5df2 GKH |
590 | if (ret != 0) { |
591 | DPRINT_DBG(STORVSC, "Unable to send packet %p ret %d", | |
f638859e | 592 | vstor_packet, ret); |
bef4a34a HJ |
593 | } |
594 | ||
f638859e | 595 | atomic_inc(&stor_device->num_outstanding_req); |
bef4a34a | 596 | |
f638859e | 597 | put_stor_device(device); |
bef4a34a HJ |
598 | return ret; |
599 | } | |
600 | ||
1f91bca8 S |
601 | /* |
602 | * The channel properties uniquely specify how the device is to be | |
603 | * presented to the guest. Map this information for use by the block | |
604 | * driver. For Linux guests on Hyper-V, we emulate a scsi HBA in the guest | |
605 | * (storvsc_drv) and so scsi devices in the guest are handled by | |
606 | * native upper level Linux drivers. Consequently, Hyper-V | |
607 | * block driver, while being a generic block driver, presently does not | |
608 | * deal with anything other than devices that would need to be presented | |
609 | * to the guest as an IDE disk. | |
610 | * | |
611 | * This function maps the channel properties as embedded in the input | |
612 | * parameter device_info onto information necessary to register the | |
613 | * corresponding block device. | |
614 | * | |
615 | * Currently, there is no way to stop the emulation of the block device | |
616 | * on the host side. And so, to prevent the native IDE drivers in Linux | |
617 | * from taking over these devices (to be managedby Hyper-V block | |
618 | * driver), we will take over if need be the major of the IDE controllers. | |
619 | * | |
620 | */ | |
621 | ||
43c51f7d | 622 | int storvsc_get_major_info(struct storvsc_device_info *device_info, |
1f91bca8 S |
623 | struct storvsc_major_info *major_info) |
624 | { | |
625 | static bool ide0_registered; | |
626 | static bool ide1_registered; | |
627 | ||
628 | /* | |
629 | * For now we only support IDE disks. | |
630 | */ | |
631 | major_info->devname = "ide"; | |
632 | major_info->diskname = "hd"; | |
633 | ||
634 | if (device_info->path_id) { | |
635 | major_info->major = 22; | |
e46ee8ef | 636 | if (!ide1_registered) { |
1f91bca8 | 637 | major_info->do_register = true; |
1f91bca8 | 638 | ide1_registered = true; |
e46ee8ef S |
639 | } else |
640 | major_info->do_register = false; | |
641 | ||
1f91bca8 S |
642 | if (device_info->target_id) |
643 | major_info->index = 3; | |
e46ee8ef | 644 | else |
1f91bca8 S |
645 | major_info->index = 2; |
646 | ||
647 | return 0; | |
648 | } else { | |
649 | major_info->major = 3; | |
e46ee8ef | 650 | if (!ide0_registered) { |
1f91bca8 | 651 | major_info->do_register = true; |
1f91bca8 | 652 | ide0_registered = true; |
e46ee8ef S |
653 | } else |
654 | major_info->do_register = false; | |
655 | ||
1f91bca8 S |
656 | if (device_info->target_id) |
657 | major_info->index = 1; | |
658 | else | |
659 | major_info->index = 0; | |
660 | ||
661 | return 0; | |
662 | } | |
663 | ||
664 | return -ENODEV; | |
665 | } | |
666 |