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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> | |
6028210e | 20 | * K. Y. Srinivasan <kys@microsoft.com> |
1f91bca8 | 21 | * |
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> |
3f335ea2 S |
30 | |
31 | #include "hyperv.h" | |
bb969793 | 32 | #include "storvsc_api.h" |
2dd88b51 | 33 | #include "vstorage.h" |
bef4a34a HJ |
34 | |
35 | ||
f638859e | 36 | static inline struct storvsc_device *alloc_stor_device(struct hv_device *device) |
bef4a34a | 37 | { |
f638859e | 38 | struct storvsc_device *stor_device; |
bef4a34a | 39 | |
f638859e HJ |
40 | stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
41 | if (!stor_device) | |
bef4a34a HJ |
42 | return NULL; |
43 | ||
454f18a9 | 44 | /* Set to 2 to allow both inbound and outbound traffics */ |
3d8cdf22 | 45 | /* (ie get_stor_device() and must_get_stor_device()) to proceed. */ |
f638859e | 46 | atomic_cmpxchg(&stor_device->ref_count, 0, 2); |
bef4a34a | 47 | |
604df37d | 48 | init_waitqueue_head(&stor_device->waiting_to_drain); |
f638859e | 49 | stor_device->device = device; |
ca623ad3 | 50 | device->ext = stor_device; |
bef4a34a | 51 | |
f638859e | 52 | return stor_device; |
bef4a34a HJ |
53 | } |
54 | ||
f638859e | 55 | static inline void free_stor_device(struct storvsc_device *device) |
bef4a34a | 56 | { |
f638859e | 57 | kfree(device); |
bef4a34a HJ |
58 | } |
59 | ||
454f18a9 | 60 | /* Get the stordevice object iff exists and its refcount > 0 */ |
02e37db7 | 61 | static inline struct storvsc_device *must_get_stor_device( |
f638859e | 62 | struct hv_device *device) |
bef4a34a | 63 | { |
f638859e | 64 | struct storvsc_device *stor_device; |
bef4a34a | 65 | |
ca623ad3 | 66 | stor_device = (struct storvsc_device *)device->ext; |
f638859e HJ |
67 | if (stor_device && atomic_read(&stor_device->ref_count)) |
68 | atomic_inc(&stor_device->ref_count); | |
bef4a34a | 69 | else |
f638859e | 70 | stor_device = NULL; |
bef4a34a | 71 | |
f638859e | 72 | return stor_device; |
bef4a34a HJ |
73 | } |
74 | ||
02e37db7 HJ |
75 | /* Drop ref count to 1 to effectively disable get_stor_device() */ |
76 | static inline struct storvsc_device *release_stor_device( | |
f638859e | 77 | struct hv_device *device) |
bef4a34a | 78 | { |
f638859e | 79 | struct storvsc_device *stor_device; |
bef4a34a | 80 | |
ca623ad3 | 81 | stor_device = (struct storvsc_device *)device->ext; |
bef4a34a | 82 | |
454f18a9 | 83 | /* Busy wait until the ref drop to 2, then set it to 1 */ |
f638859e | 84 | while (atomic_cmpxchg(&stor_device->ref_count, 2, 1) != 2) |
b4362c9c | 85 | udelay(100); |
bef4a34a | 86 | |
f638859e | 87 | return stor_device; |
bef4a34a HJ |
88 | } |
89 | ||
f638859e | 90 | /* Drop ref count to 0. No one can use stor_device object. */ |
02e37db7 | 91 | static inline struct storvsc_device *final_release_stor_device( |
f638859e | 92 | struct hv_device *device) |
bef4a34a | 93 | { |
f638859e | 94 | struct storvsc_device *stor_device; |
bef4a34a | 95 | |
ca623ad3 | 96 | stor_device = (struct storvsc_device *)device->ext; |
bef4a34a | 97 | |
454f18a9 | 98 | /* Busy wait until the ref drop to 1, then set it to 0 */ |
f638859e | 99 | while (atomic_cmpxchg(&stor_device->ref_count, 1, 0) != 1) |
b4362c9c | 100 | udelay(100); |
bef4a34a | 101 | |
ca623ad3 | 102 | device->ext = NULL; |
f638859e | 103 | return stor_device; |
bef4a34a HJ |
104 | } |
105 | ||
3fa22517 | 106 | static int storvsc_channel_init(struct hv_device *device) |
bef4a34a | 107 | { |
f638859e | 108 | struct storvsc_device *stor_device; |
d7a1bdb9 | 109 | struct hv_storvsc_request *request; |
f638859e | 110 | struct vstor_packet *vstor_packet; |
93958465 | 111 | int ret, t; |
bef4a34a | 112 | |
f638859e | 113 | stor_device = get_stor_device(device); |
5f61ec34 | 114 | if (!stor_device) |
bef4a34a | 115 | return -1; |
bef4a34a | 116 | |
f638859e HJ |
117 | request = &stor_device->init_request; |
118 | vstor_packet = &request->vstor_packet; | |
bef4a34a | 119 | |
068c5df2 GKH |
120 | /* |
121 | * Now, initiate the vsc/vsp initialization protocol on the open | |
122 | * channel | |
123 | */ | |
d7a1bdb9 | 124 | memset(request, 0, sizeof(struct hv_storvsc_request)); |
93958465 | 125 | init_completion(&request->wait_event); |
f638859e HJ |
126 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; |
127 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
bef4a34a | 128 | |
bef4a34a HJ |
129 | DPRINT_INFO(STORVSC, "BEGIN_INITIALIZATION_OPERATION..."); |
130 | ||
f638859e | 131 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
b60d71e2 GKH |
132 | sizeof(struct vstor_packet), |
133 | (unsigned long)request, | |
415f2287 | 134 | VM_PKT_DATA_INBAND, |
b60d71e2 | 135 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
5f61ec34 | 136 | if (ret != 0) |
0c3b7b2f | 137 | goto cleanup; |
0c3b7b2f | 138 | |
93958465 S |
139 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
140 | if (t == 0) { | |
0c3b7b2f S |
141 | ret = -ETIMEDOUT; |
142 | goto cleanup; | |
bef4a34a HJ |
143 | } |
144 | ||
f638859e | 145 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
5f61ec34 | 146 | vstor_packet->status != 0) |
0c3b7b2f | 147 | goto cleanup; |
bef4a34a HJ |
148 | |
149 | DPRINT_INFO(STORVSC, "QUERY_PROTOCOL_VERSION_OPERATION..."); | |
150 | ||
454f18a9 | 151 | /* reuse the packet for version range supported */ |
f638859e HJ |
152 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
153 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
154 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
bef4a34a | 155 | |
f638859e HJ |
156 | vstor_packet->version.major_minor = VMSTOR_PROTOCOL_VERSION_CURRENT; |
157 | FILL_VMSTOR_REVISION(vstor_packet->version.revision); | |
bef4a34a | 158 | |
f638859e | 159 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
b60d71e2 GKH |
160 | sizeof(struct vstor_packet), |
161 | (unsigned long)request, | |
415f2287 | 162 | VM_PKT_DATA_INBAND, |
b60d71e2 | 163 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
5f61ec34 | 164 | if (ret != 0) |
0c3b7b2f | 165 | goto cleanup; |
bef4a34a | 166 | |
93958465 S |
167 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
168 | if (t == 0) { | |
0c3b7b2f S |
169 | ret = -ETIMEDOUT; |
170 | goto cleanup; | |
171 | } | |
bef4a34a | 172 | |
454f18a9 | 173 | /* TODO: Check returned version */ |
f638859e | 174 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
5f61ec34 | 175 | vstor_packet->status != 0) |
0c3b7b2f | 176 | goto cleanup; |
bef4a34a | 177 | |
454f18a9 | 178 | /* Query channel properties */ |
bef4a34a HJ |
179 | DPRINT_INFO(STORVSC, "QUERY_PROPERTIES_OPERATION..."); |
180 | ||
f638859e HJ |
181 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
182 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
183 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
184 | vstor_packet->storage_channel_properties.port_number = | |
185 | stor_device->port_number; | |
bef4a34a | 186 | |
f638859e | 187 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
b60d71e2 GKH |
188 | sizeof(struct vstor_packet), |
189 | (unsigned long)request, | |
415f2287 | 190 | VM_PKT_DATA_INBAND, |
b60d71e2 | 191 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
068c5df2 | 192 | |
5f61ec34 | 193 | if (ret != 0) |
0c3b7b2f | 194 | goto cleanup; |
bef4a34a | 195 | |
93958465 S |
196 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
197 | if (t == 0) { | |
0c3b7b2f S |
198 | ret = -ETIMEDOUT; |
199 | goto cleanup; | |
200 | } | |
bef4a34a | 201 | |
454f18a9 | 202 | /* TODO: Check returned version */ |
f638859e | 203 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
5f61ec34 | 204 | vstor_packet->status != 0) |
0c3b7b2f | 205 | goto cleanup; |
bef4a34a | 206 | |
f638859e HJ |
207 | stor_device->path_id = vstor_packet->storage_channel_properties.path_id; |
208 | stor_device->target_id | |
209 | = vstor_packet->storage_channel_properties.target_id; | |
bef4a34a | 210 | |
bef4a34a HJ |
211 | DPRINT_INFO(STORVSC, "END_INITIALIZATION_OPERATION..."); |
212 | ||
f638859e HJ |
213 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
214 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
215 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
bef4a34a | 216 | |
f638859e | 217 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
b60d71e2 GKH |
218 | sizeof(struct vstor_packet), |
219 | (unsigned long)request, | |
415f2287 | 220 | VM_PKT_DATA_INBAND, |
b60d71e2 | 221 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
068c5df2 | 222 | |
5f61ec34 | 223 | if (ret != 0) |
0c3b7b2f | 224 | goto cleanup; |
bef4a34a | 225 | |
93958465 S |
226 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
227 | if (t == 0) { | |
0c3b7b2f S |
228 | ret = -ETIMEDOUT; |
229 | goto cleanup; | |
230 | } | |
bef4a34a | 231 | |
f638859e | 232 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
5f61ec34 | 233 | vstor_packet->status != 0) |
0c3b7b2f | 234 | goto cleanup; |
bef4a34a HJ |
235 | |
236 | DPRINT_INFO(STORVSC, "**** storage channel up and running!! ****"); | |
237 | ||
0c3b7b2f | 238 | cleanup: |
f638859e | 239 | put_stor_device(device); |
bef4a34a HJ |
240 | return ret; |
241 | } | |
242 | ||
a38b94f9 | 243 | static void storvsc_on_io_completion(struct hv_device *device, |
f638859e | 244 | struct vstor_packet *vstor_packet, |
d7a1bdb9 | 245 | struct hv_storvsc_request *request) |
163680b4 | 246 | { |
f638859e | 247 | struct storvsc_device *stor_device; |
a617e395 | 248 | struct vstor_packet *stor_pkt; |
163680b4 | 249 | |
f638859e | 250 | stor_device = must_get_stor_device(device); |
5f61ec34 | 251 | if (!stor_device) |
163680b4 | 252 | return; |
163680b4 | 253 | |
a617e395 | 254 | stor_pkt = &request->vstor_packet; |
163680b4 | 255 | |
163680b4 GKH |
256 | |
257 | /* Copy over the status...etc */ | |
a617e395 S |
258 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; |
259 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
260 | stor_pkt->vm_srb.sense_info_length = | |
261 | vstor_packet->vm_srb.sense_info_length; | |
163680b4 | 262 | |
6dc3f0a7 | 263 | if (vstor_packet->vm_srb.scsi_status != 0 || |
5f61ec34 | 264 | vstor_packet->vm_srb.srb_status != 1){ |
163680b4 GKH |
265 | DPRINT_WARN(STORVSC, |
266 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
a617e395 | 267 | stor_pkt->vm_srb.cdb[0], |
373dd8a9 | 268 | vstor_packet->vm_srb.scsi_status, |
f638859e | 269 | vstor_packet->vm_srb.srb_status); |
163680b4 GKH |
270 | } |
271 | ||
6dc3f0a7 | 272 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { |
163680b4 | 273 | /* CHECK_CONDITION */ |
f638859e | 274 | if (vstor_packet->vm_srb.srb_status & 0x80) { |
163680b4 GKH |
275 | /* autosense data available */ |
276 | DPRINT_WARN(STORVSC, "storvsc pkt %p autosense data " | |
d7a1bdb9 | 277 | "valid - len %d\n", request, |
f638859e | 278 | vstor_packet->vm_srb.sense_info_length); |
163680b4 | 279 | |
d7a1bdb9 | 280 | memcpy(request->sense_buffer, |
f638859e HJ |
281 | vstor_packet->vm_srb.sense_data, |
282 | vstor_packet->vm_srb.sense_info_length); | |
163680b4 | 283 | |
163680b4 GKH |
284 | } |
285 | } | |
286 | ||
a617e395 S |
287 | stor_pkt->vm_srb.data_transfer_length = |
288 | vstor_packet->vm_srb.data_transfer_length; | |
163680b4 | 289 | |
d7a1bdb9 | 290 | request->on_io_completion(request); |
163680b4 | 291 | |
604df37d S |
292 | if (atomic_dec_and_test(&stor_device->num_outstanding_req) && |
293 | stor_device->drain_notify) | |
294 | wake_up(&stor_device->waiting_to_drain); | |
295 | ||
163680b4 | 296 | |
f638859e | 297 | put_stor_device(device); |
163680b4 GKH |
298 | } |
299 | ||
8e6766f8 | 300 | static void storvsc_on_receive(struct hv_device *device, |
f638859e | 301 | struct vstor_packet *vstor_packet, |
d7a1bdb9 | 302 | struct hv_storvsc_request *request) |
163680b4 | 303 | { |
f638859e | 304 | switch (vstor_packet->operation) { |
d2aaba45 | 305 | case VSTOR_OPERATION_COMPLETE_IO: |
a38b94f9 | 306 | storvsc_on_io_completion(device, vstor_packet, request); |
163680b4 | 307 | break; |
d2aaba45 | 308 | case VSTOR_OPERATION_REMOVE_DEVICE: |
163680b4 GKH |
309 | DPRINT_INFO(STORVSC, "REMOVE_DEVICE_OPERATION"); |
310 | /* TODO: */ | |
311 | break; | |
312 | ||
313 | default: | |
314 | DPRINT_INFO(STORVSC, "Unknown operation received - %d", | |
f638859e | 315 | vstor_packet->operation); |
163680b4 GKH |
316 | break; |
317 | } | |
318 | } | |
319 | ||
24d9aab0 | 320 | static void storvsc_on_channel_callback(void *context) |
163680b4 GKH |
321 | { |
322 | struct hv_device *device = (struct hv_device *)context; | |
f638859e HJ |
323 | struct storvsc_device *stor_device; |
324 | u32 bytes_recvd; | |
325 | u64 request_id; | |
73509681 | 326 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; |
d7a1bdb9 | 327 | struct hv_storvsc_request *request; |
163680b4 GKH |
328 | int ret; |
329 | ||
163680b4 | 330 | |
f638859e | 331 | stor_device = must_get_stor_device(device); |
5f61ec34 | 332 | if (!stor_device) |
163680b4 | 333 | return; |
163680b4 GKH |
334 | |
335 | do { | |
50ea95df | 336 | ret = vmbus_recvpacket(device->channel, packet, |
73509681 | 337 | ALIGN(sizeof(struct vstor_packet), 8), |
f638859e HJ |
338 | &bytes_recvd, &request_id); |
339 | if (ret == 0 && bytes_recvd > 0) { | |
163680b4 | 340 | |
d7a1bdb9 | 341 | request = (struct hv_storvsc_request *) |
f638859e | 342 | (unsigned long)request_id; |
163680b4 | 343 | |
f638859e HJ |
344 | if ((request == &stor_device->init_request) || |
345 | (request == &stor_device->reset_request)) { | |
163680b4 | 346 | |
3d8cdf22 | 347 | memcpy(&request->vstor_packet, packet, |
163680b4 | 348 | sizeof(struct vstor_packet)); |
93958465 | 349 | complete(&request->wait_event); |
163680b4 | 350 | } else { |
8e6766f8 | 351 | storvsc_on_receive(device, |
163680b4 GKH |
352 | (struct vstor_packet *)packet, |
353 | request); | |
354 | } | |
355 | } else { | |
163680b4 GKH |
356 | break; |
357 | } | |
358 | } while (1); | |
359 | ||
02e37db7 | 360 | put_stor_device(device); |
163680b4 GKH |
361 | return; |
362 | } | |
363 | ||
fa4d123a | 364 | static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) |
bef4a34a | 365 | { |
b3715ee4 | 366 | struct vmstorage_channel_properties props; |
068c5df2 | 367 | int ret; |
bef4a34a | 368 | |
8c960e49 | 369 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); |
bef4a34a | 370 | |
454f18a9 | 371 | /* Open the channel */ |
f638859e | 372 | ret = vmbus_open(device->channel, |
fa4d123a S |
373 | ring_size, |
374 | ring_size, | |
60f841ac GKH |
375 | (void *)&props, |
376 | sizeof(struct vmstorage_channel_properties), | |
24d9aab0 | 377 | storvsc_on_channel_callback, device); |
068c5df2 | 378 | |
5f61ec34 | 379 | if (ret != 0) |
bef4a34a | 380 | return -1; |
bef4a34a | 381 | |
3fa22517 | 382 | ret = storvsc_channel_init(device); |
bef4a34a HJ |
383 | |
384 | return ret; | |
385 | } | |
386 | ||
2ac5dad1 | 387 | int storvsc_dev_add(struct hv_device *device, |
f638859e | 388 | void *additional_info) |
163680b4 | 389 | { |
f638859e | 390 | struct storvsc_device *stor_device; |
f638859e | 391 | struct storvsc_device_info *device_info; |
163680b4 GKH |
392 | int ret = 0; |
393 | ||
f638859e HJ |
394 | device_info = (struct storvsc_device_info *)additional_info; |
395 | stor_device = alloc_stor_device(device); | |
396 | if (!stor_device) { | |
163680b4 | 397 | ret = -1; |
0c3b7b2f | 398 | goto cleanup; |
163680b4 GKH |
399 | } |
400 | ||
401 | /* Save the channel properties to our storvsc channel */ | |
163680b4 GKH |
402 | |
403 | /* FIXME: */ | |
404 | /* | |
405 | * If we support more than 1 scsi channel, we need to set the | |
406 | * port number here to the scsi channel but how do we get the | |
407 | * scsi channel prior to the bus scan | |
408 | */ | |
409 | ||
f638859e | 410 | stor_device->port_number = device_info->port_number; |
163680b4 | 411 | /* Send it back up */ |
fa4d123a | 412 | ret = storvsc_connect_to_vsp(device, device_info->ring_buffer_size); |
163680b4 | 413 | |
f638859e HJ |
414 | device_info->path_id = stor_device->path_id; |
415 | device_info->target_id = stor_device->target_id; | |
163680b4 | 416 | |
0c3b7b2f | 417 | cleanup: |
163680b4 GKH |
418 | return ret; |
419 | } | |
bef4a34a | 420 | |
cb706b04 | 421 | int storvsc_dev_remove(struct hv_device *device) |
bef4a34a | 422 | { |
f638859e | 423 | struct storvsc_device *stor_device; |
bef4a34a | 424 | |
068c5df2 | 425 | DPRINT_INFO(STORVSC, "disabling storage device (%p)...", |
ca623ad3 | 426 | device->ext); |
bef4a34a | 427 | |
f638859e | 428 | stor_device = release_stor_device(device); |
bef4a34a | 429 | |
454f18a9 BP |
430 | /* |
431 | * At this point, all outbound traffic should be disable. We | |
432 | * only allow inbound traffic (responses) to proceed so that | |
433 | * outstanding requests can be completed. | |
434 | */ | |
19fc2f2a S |
435 | |
436 | storvsc_wait_to_drain(stor_device); | |
bef4a34a | 437 | |
f638859e | 438 | stor_device = final_release_stor_device(device); |
bef4a34a | 439 | |
454f18a9 | 440 | /* Close the channel */ |
f638859e | 441 | vmbus_close(device->channel); |
bef4a34a | 442 | |
f638859e | 443 | free_stor_device(stor_device); |
068c5df2 | 444 | return 0; |
454f18a9 | 445 | } |
bef4a34a | 446 | |
bb465926 | 447 | int storvsc_do_io(struct hv_device *device, |
f638859e | 448 | struct hv_storvsc_request *request) |
bef4a34a | 449 | { |
f638859e | 450 | struct storvsc_device *stor_device; |
f638859e | 451 | struct vstor_packet *vstor_packet; |
068c5df2 | 452 | int ret = 0; |
bef4a34a | 453 | |
d7a1bdb9 | 454 | vstor_packet = &request->vstor_packet; |
f638859e | 455 | stor_device = get_stor_device(device); |
bef4a34a | 456 | |
5f61ec34 | 457 | if (!stor_device) |
bef4a34a | 458 | return -2; |
bef4a34a | 459 | |
bef4a34a | 460 | |
d7a1bdb9 | 461 | request->device = device; |
bef4a34a | 462 | |
a617e395 | 463 | |
f638859e | 464 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; |
bef4a34a | 465 | |
f638859e | 466 | vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); |
bef4a34a | 467 | |
bef4a34a | 468 | |
f638859e | 469 | vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE; |
bef4a34a | 470 | |
bef4a34a | 471 | |
e9e936c6 | 472 | vstor_packet->vm_srb.data_transfer_length = |
d7a1bdb9 | 473 | request->data_buffer.len; |
bef4a34a | 474 | |
f638859e | 475 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; |
bef4a34a | 476 | |
d7a1bdb9 | 477 | if (request->data_buffer.len) { |
f638859e | 478 | ret = vmbus_sendpacket_multipagebuffer(device->channel, |
d7a1bdb9 | 479 | &request->data_buffer, |
f638859e | 480 | vstor_packet, |
b3715ee4 | 481 | sizeof(struct vstor_packet), |
d7a1bdb9 | 482 | (unsigned long)request); |
068c5df2 | 483 | } else { |
f638859e | 484 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
b60d71e2 | 485 | sizeof(struct vstor_packet), |
d7a1bdb9 | 486 | (unsigned long)request, |
415f2287 | 487 | VM_PKT_DATA_INBAND, |
b60d71e2 | 488 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
bef4a34a HJ |
489 | } |
490 | ||
5f61ec34 S |
491 | if (ret != 0) |
492 | return ret; | |
bef4a34a | 493 | |
f638859e | 494 | atomic_inc(&stor_device->num_outstanding_req); |
bef4a34a | 495 | |
f638859e | 496 | put_stor_device(device); |
bef4a34a HJ |
497 | return ret; |
498 | } | |
499 | ||
1f91bca8 S |
500 | /* |
501 | * The channel properties uniquely specify how the device is to be | |
502 | * presented to the guest. Map this information for use by the block | |
503 | * driver. For Linux guests on Hyper-V, we emulate a scsi HBA in the guest | |
504 | * (storvsc_drv) and so scsi devices in the guest are handled by | |
505 | * native upper level Linux drivers. Consequently, Hyper-V | |
506 | * block driver, while being a generic block driver, presently does not | |
507 | * deal with anything other than devices that would need to be presented | |
508 | * to the guest as an IDE disk. | |
509 | * | |
510 | * This function maps the channel properties as embedded in the input | |
511 | * parameter device_info onto information necessary to register the | |
512 | * corresponding block device. | |
513 | * | |
514 | * Currently, there is no way to stop the emulation of the block device | |
515 | * on the host side. And so, to prevent the native IDE drivers in Linux | |
516 | * from taking over these devices (to be managedby Hyper-V block | |
517 | * driver), we will take over if need be the major of the IDE controllers. | |
518 | * | |
519 | */ | |
520 | ||
43c51f7d | 521 | int storvsc_get_major_info(struct storvsc_device_info *device_info, |
1f91bca8 S |
522 | struct storvsc_major_info *major_info) |
523 | { | |
524 | static bool ide0_registered; | |
525 | static bool ide1_registered; | |
526 | ||
527 | /* | |
528 | * For now we only support IDE disks. | |
529 | */ | |
530 | major_info->devname = "ide"; | |
531 | major_info->diskname = "hd"; | |
532 | ||
533 | if (device_info->path_id) { | |
534 | major_info->major = 22; | |
e46ee8ef | 535 | if (!ide1_registered) { |
1f91bca8 | 536 | major_info->do_register = true; |
1f91bca8 | 537 | ide1_registered = true; |
e46ee8ef S |
538 | } else |
539 | major_info->do_register = false; | |
540 | ||
1f91bca8 S |
541 | if (device_info->target_id) |
542 | major_info->index = 3; | |
e46ee8ef | 543 | else |
1f91bca8 S |
544 | major_info->index = 2; |
545 | ||
546 | return 0; | |
547 | } else { | |
548 | major_info->major = 3; | |
e46ee8ef | 549 | if (!ide0_registered) { |
1f91bca8 | 550 | major_info->do_register = true; |
1f91bca8 | 551 | ide0_registered = true; |
e46ee8ef S |
552 | } else |
553 | major_info->do_register = false; | |
554 | ||
1f91bca8 S |
555 | if (device_info->target_id) |
556 | major_info->index = 1; | |
557 | else | |
558 | major_info->index = 0; | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
563 | return -ENODEV; | |
564 | } | |
565 |