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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 | |
f638859e | 50 | stor_device->device = device; |
ca623ad3 | 51 | device->ext = stor_device; |
bef4a34a | 52 | |
f638859e | 53 | return stor_device; |
bef4a34a HJ |
54 | } |
55 | ||
f638859e | 56 | static inline void free_stor_device(struct storvsc_device *device) |
bef4a34a | 57 | { |
f638859e | 58 | kfree(device); |
bef4a34a HJ |
59 | } |
60 | ||
454f18a9 | 61 | /* Get the stordevice object iff exists and its refcount > 0 */ |
02e37db7 | 62 | static inline struct storvsc_device *must_get_stor_device( |
f638859e | 63 | struct hv_device *device) |
bef4a34a | 64 | { |
f638859e | 65 | struct storvsc_device *stor_device; |
bef4a34a | 66 | |
ca623ad3 | 67 | stor_device = (struct storvsc_device *)device->ext; |
f638859e HJ |
68 | if (stor_device && atomic_read(&stor_device->ref_count)) |
69 | atomic_inc(&stor_device->ref_count); | |
bef4a34a | 70 | else |
f638859e | 71 | stor_device = NULL; |
bef4a34a | 72 | |
f638859e | 73 | return stor_device; |
bef4a34a HJ |
74 | } |
75 | ||
02e37db7 HJ |
76 | /* Drop ref count to 1 to effectively disable get_stor_device() */ |
77 | static inline struct storvsc_device *release_stor_device( | |
f638859e | 78 | struct hv_device *device) |
bef4a34a | 79 | { |
f638859e | 80 | struct storvsc_device *stor_device; |
bef4a34a | 81 | |
ca623ad3 | 82 | stor_device = (struct storvsc_device *)device->ext; |
bef4a34a | 83 | |
454f18a9 | 84 | /* Busy wait until the ref drop to 2, then set it to 1 */ |
f638859e | 85 | while (atomic_cmpxchg(&stor_device->ref_count, 2, 1) != 2) |
b4362c9c | 86 | udelay(100); |
bef4a34a | 87 | |
f638859e | 88 | return stor_device; |
bef4a34a HJ |
89 | } |
90 | ||
f638859e | 91 | /* Drop ref count to 0. No one can use stor_device object. */ |
02e37db7 | 92 | static inline struct storvsc_device *final_release_stor_device( |
f638859e | 93 | struct hv_device *device) |
bef4a34a | 94 | { |
f638859e | 95 | struct storvsc_device *stor_device; |
bef4a34a | 96 | |
ca623ad3 | 97 | stor_device = (struct storvsc_device *)device->ext; |
bef4a34a | 98 | |
454f18a9 | 99 | /* Busy wait until the ref drop to 1, then set it to 0 */ |
f638859e | 100 | while (atomic_cmpxchg(&stor_device->ref_count, 1, 0) != 1) |
b4362c9c | 101 | udelay(100); |
bef4a34a | 102 | |
ca623ad3 | 103 | device->ext = NULL; |
f638859e | 104 | return stor_device; |
bef4a34a HJ |
105 | } |
106 | ||
f638859e | 107 | static int stor_vsc_channel_init(struct hv_device *device) |
bef4a34a | 108 | { |
f638859e | 109 | struct storvsc_device *stor_device; |
d7a1bdb9 | 110 | struct hv_storvsc_request *request; |
f638859e | 111 | struct vstor_packet *vstor_packet; |
93958465 | 112 | int ret, t; |
bef4a34a | 113 | |
f638859e HJ |
114 | stor_device = get_stor_device(device); |
115 | if (!stor_device) { | |
068c5df2 GKH |
116 | DPRINT_ERR(STORVSC, "unable to get stor device..." |
117 | "device being destroyed?"); | |
bef4a34a HJ |
118 | return -1; |
119 | } | |
120 | ||
f638859e HJ |
121 | request = &stor_device->init_request; |
122 | vstor_packet = &request->vstor_packet; | |
bef4a34a | 123 | |
068c5df2 GKH |
124 | /* |
125 | * Now, initiate the vsc/vsp initialization protocol on the open | |
126 | * channel | |
127 | */ | |
d7a1bdb9 | 128 | memset(request, 0, sizeof(struct hv_storvsc_request)); |
93958465 | 129 | init_completion(&request->wait_event); |
f638859e HJ |
130 | vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; |
131 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
bef4a34a | 132 | |
bef4a34a HJ |
133 | DPRINT_INFO(STORVSC, "BEGIN_INITIALIZATION_OPERATION..."); |
134 | ||
f638859e | 135 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
b60d71e2 GKH |
136 | sizeof(struct vstor_packet), |
137 | (unsigned long)request, | |
415f2287 | 138 | VM_PKT_DATA_INBAND, |
b60d71e2 | 139 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
068c5df2 GKH |
140 | if (ret != 0) { |
141 | DPRINT_ERR(STORVSC, | |
142 | "unable to send BEGIN_INITIALIZATION_OPERATION"); | |
0c3b7b2f S |
143 | goto cleanup; |
144 | } | |
145 | ||
93958465 S |
146 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
147 | if (t == 0) { | |
0c3b7b2f S |
148 | ret = -ETIMEDOUT; |
149 | goto cleanup; | |
bef4a34a HJ |
150 | } |
151 | ||
f638859e HJ |
152 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
153 | vstor_packet->status != 0) { | |
068c5df2 GKH |
154 | DPRINT_ERR(STORVSC, "BEGIN_INITIALIZATION_OPERATION failed " |
155 | "(op %d status 0x%x)", | |
f638859e | 156 | vstor_packet->operation, vstor_packet->status); |
0c3b7b2f | 157 | goto cleanup; |
bef4a34a HJ |
158 | } |
159 | ||
160 | DPRINT_INFO(STORVSC, "QUERY_PROTOCOL_VERSION_OPERATION..."); | |
161 | ||
454f18a9 | 162 | /* reuse the packet for version range supported */ |
f638859e HJ |
163 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
164 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; | |
165 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
bef4a34a | 166 | |
f638859e HJ |
167 | vstor_packet->version.major_minor = VMSTOR_PROTOCOL_VERSION_CURRENT; |
168 | FILL_VMSTOR_REVISION(vstor_packet->version.revision); | |
bef4a34a | 169 | |
f638859e | 170 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
b60d71e2 GKH |
171 | sizeof(struct vstor_packet), |
172 | (unsigned long)request, | |
415f2287 | 173 | VM_PKT_DATA_INBAND, |
b60d71e2 | 174 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
068c5df2 GKH |
175 | if (ret != 0) { |
176 | DPRINT_ERR(STORVSC, | |
177 | "unable to send BEGIN_INITIALIZATION_OPERATION"); | |
0c3b7b2f | 178 | goto cleanup; |
bef4a34a HJ |
179 | } |
180 | ||
93958465 S |
181 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
182 | if (t == 0) { | |
0c3b7b2f S |
183 | ret = -ETIMEDOUT; |
184 | goto cleanup; | |
185 | } | |
bef4a34a | 186 | |
454f18a9 | 187 | /* TODO: Check returned version */ |
f638859e HJ |
188 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
189 | vstor_packet->status != 0) { | |
068c5df2 GKH |
190 | DPRINT_ERR(STORVSC, "QUERY_PROTOCOL_VERSION_OPERATION failed " |
191 | "(op %d status 0x%x)", | |
f638859e | 192 | vstor_packet->operation, vstor_packet->status); |
0c3b7b2f | 193 | goto cleanup; |
bef4a34a HJ |
194 | } |
195 | ||
454f18a9 | 196 | /* Query channel properties */ |
bef4a34a HJ |
197 | DPRINT_INFO(STORVSC, "QUERY_PROPERTIES_OPERATION..."); |
198 | ||
f638859e HJ |
199 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
200 | vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; | |
201 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
202 | vstor_packet->storage_channel_properties.port_number = | |
203 | stor_device->port_number; | |
bef4a34a | 204 | |
f638859e | 205 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
b60d71e2 GKH |
206 | sizeof(struct vstor_packet), |
207 | (unsigned long)request, | |
415f2287 | 208 | VM_PKT_DATA_INBAND, |
b60d71e2 | 209 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
068c5df2 GKH |
210 | |
211 | if (ret != 0) { | |
212 | DPRINT_ERR(STORVSC, | |
213 | "unable to send QUERY_PROPERTIES_OPERATION"); | |
0c3b7b2f | 214 | goto cleanup; |
bef4a34a HJ |
215 | } |
216 | ||
93958465 S |
217 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
218 | if (t == 0) { | |
0c3b7b2f S |
219 | ret = -ETIMEDOUT; |
220 | goto cleanup; | |
221 | } | |
bef4a34a | 222 | |
454f18a9 | 223 | /* TODO: Check returned version */ |
f638859e HJ |
224 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
225 | vstor_packet->status != 0) { | |
068c5df2 GKH |
226 | DPRINT_ERR(STORVSC, "QUERY_PROPERTIES_OPERATION failed " |
227 | "(op %d status 0x%x)", | |
f638859e | 228 | vstor_packet->operation, vstor_packet->status); |
0c3b7b2f | 229 | goto cleanup; |
bef4a34a HJ |
230 | } |
231 | ||
f638859e HJ |
232 | stor_device->path_id = vstor_packet->storage_channel_properties.path_id; |
233 | stor_device->target_id | |
234 | = vstor_packet->storage_channel_properties.target_id; | |
bef4a34a | 235 | |
068c5df2 | 236 | DPRINT_DBG(STORVSC, "channel flag 0x%x, max xfer len 0x%x", |
f638859e HJ |
237 | vstor_packet->storage_channel_properties.flags, |
238 | vstor_packet->storage_channel_properties.max_transfer_bytes); | |
bef4a34a HJ |
239 | |
240 | DPRINT_INFO(STORVSC, "END_INITIALIZATION_OPERATION..."); | |
241 | ||
f638859e HJ |
242 | memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
243 | vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; | |
244 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
bef4a34a | 245 | |
f638859e | 246 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
b60d71e2 GKH |
247 | sizeof(struct vstor_packet), |
248 | (unsigned long)request, | |
415f2287 | 249 | VM_PKT_DATA_INBAND, |
b60d71e2 | 250 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
068c5df2 GKH |
251 | |
252 | if (ret != 0) { | |
253 | DPRINT_ERR(STORVSC, | |
254 | "unable to send END_INITIALIZATION_OPERATION"); | |
0c3b7b2f | 255 | goto cleanup; |
bef4a34a HJ |
256 | } |
257 | ||
93958465 S |
258 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
259 | if (t == 0) { | |
0c3b7b2f S |
260 | ret = -ETIMEDOUT; |
261 | goto cleanup; | |
262 | } | |
bef4a34a | 263 | |
f638859e HJ |
264 | if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
265 | vstor_packet->status != 0) { | |
068c5df2 GKH |
266 | DPRINT_ERR(STORVSC, "END_INITIALIZATION_OPERATION failed " |
267 | "(op %d status 0x%x)", | |
f638859e | 268 | vstor_packet->operation, vstor_packet->status); |
0c3b7b2f | 269 | goto cleanup; |
bef4a34a HJ |
270 | } |
271 | ||
272 | DPRINT_INFO(STORVSC, "**** storage channel up and running!! ****"); | |
273 | ||
0c3b7b2f | 274 | cleanup: |
f638859e | 275 | put_stor_device(device); |
bef4a34a HJ |
276 | return ret; |
277 | } | |
278 | ||
f638859e HJ |
279 | static void stor_vsc_on_io_completion(struct hv_device *device, |
280 | struct vstor_packet *vstor_packet, | |
d7a1bdb9 | 281 | struct hv_storvsc_request *request) |
163680b4 | 282 | { |
f638859e | 283 | struct storvsc_device *stor_device; |
a617e395 | 284 | struct vstor_packet *stor_pkt; |
163680b4 | 285 | |
f638859e HJ |
286 | stor_device = must_get_stor_device(device); |
287 | if (!stor_device) { | |
163680b4 GKH |
288 | DPRINT_ERR(STORVSC, "unable to get stor device..." |
289 | "device being destroyed?"); | |
163680b4 GKH |
290 | return; |
291 | } | |
292 | ||
a617e395 | 293 | DPRINT_DBG(STORVSC, "IO_COMPLETE_OPERATION - request %p " |
d7a1bdb9 | 294 | "completed bytes xfer %u", request, |
f638859e | 295 | vstor_packet->vm_srb.data_transfer_length); |
163680b4 | 296 | |
a617e395 | 297 | stor_pkt = &request->vstor_packet; |
163680b4 | 298 | |
163680b4 GKH |
299 | |
300 | /* Copy over the status...etc */ | |
a617e395 S |
301 | stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; |
302 | stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; | |
303 | stor_pkt->vm_srb.sense_info_length = | |
304 | vstor_packet->vm_srb.sense_info_length; | |
163680b4 | 305 | |
6dc3f0a7 S |
306 | if (vstor_packet->vm_srb.scsi_status != 0 || |
307 | vstor_packet->vm_srb.srb_status != 1) { | |
163680b4 GKH |
308 | DPRINT_WARN(STORVSC, |
309 | "cmd 0x%x scsi status 0x%x srb status 0x%x\n", | |
a617e395 | 310 | stor_pkt->vm_srb.cdb[0], |
373dd8a9 | 311 | vstor_packet->vm_srb.scsi_status, |
f638859e | 312 | vstor_packet->vm_srb.srb_status); |
163680b4 GKH |
313 | } |
314 | ||
6dc3f0a7 | 315 | if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { |
163680b4 | 316 | /* CHECK_CONDITION */ |
f638859e | 317 | if (vstor_packet->vm_srb.srb_status & 0x80) { |
163680b4 GKH |
318 | /* autosense data available */ |
319 | DPRINT_WARN(STORVSC, "storvsc pkt %p autosense data " | |
d7a1bdb9 | 320 | "valid - len %d\n", request, |
f638859e | 321 | vstor_packet->vm_srb.sense_info_length); |
163680b4 | 322 | |
d7a1bdb9 | 323 | memcpy(request->sense_buffer, |
f638859e HJ |
324 | vstor_packet->vm_srb.sense_data, |
325 | vstor_packet->vm_srb.sense_info_length); | |
163680b4 | 326 | |
163680b4 GKH |
327 | } |
328 | } | |
329 | ||
a617e395 S |
330 | stor_pkt->vm_srb.data_transfer_length = |
331 | vstor_packet->vm_srb.data_transfer_length; | |
163680b4 | 332 | |
d7a1bdb9 | 333 | request->on_io_completion(request); |
163680b4 | 334 | |
f638859e | 335 | atomic_dec(&stor_device->num_outstanding_req); |
163680b4 | 336 | |
f638859e | 337 | put_stor_device(device); |
163680b4 GKH |
338 | } |
339 | ||
f638859e HJ |
340 | static void stor_vsc_on_receive(struct hv_device *device, |
341 | struct vstor_packet *vstor_packet, | |
d7a1bdb9 | 342 | struct hv_storvsc_request *request) |
163680b4 | 343 | { |
f638859e | 344 | switch (vstor_packet->operation) { |
d2aaba45 | 345 | case VSTOR_OPERATION_COMPLETE_IO: |
163680b4 | 346 | DPRINT_DBG(STORVSC, "IO_COMPLETE_OPERATION"); |
d7a1bdb9 | 347 | stor_vsc_on_io_completion(device, vstor_packet, request); |
163680b4 | 348 | break; |
d2aaba45 | 349 | case VSTOR_OPERATION_REMOVE_DEVICE: |
163680b4 GKH |
350 | DPRINT_INFO(STORVSC, "REMOVE_DEVICE_OPERATION"); |
351 | /* TODO: */ | |
352 | break; | |
353 | ||
354 | default: | |
355 | DPRINT_INFO(STORVSC, "Unknown operation received - %d", | |
f638859e | 356 | vstor_packet->operation); |
163680b4 GKH |
357 | break; |
358 | } | |
359 | } | |
360 | ||
02e37db7 | 361 | static void stor_vsc_on_channel_callback(void *context) |
163680b4 GKH |
362 | { |
363 | struct hv_device *device = (struct hv_device *)context; | |
f638859e HJ |
364 | struct storvsc_device *stor_device; |
365 | u32 bytes_recvd; | |
366 | u64 request_id; | |
73509681 | 367 | unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; |
d7a1bdb9 | 368 | struct hv_storvsc_request *request; |
163680b4 GKH |
369 | int ret; |
370 | ||
163680b4 | 371 | |
f638859e HJ |
372 | stor_device = must_get_stor_device(device); |
373 | if (!stor_device) { | |
163680b4 GKH |
374 | DPRINT_ERR(STORVSC, "unable to get stor device..." |
375 | "device being destroyed?"); | |
163680b4 GKH |
376 | return; |
377 | } | |
378 | ||
379 | do { | |
50ea95df | 380 | ret = vmbus_recvpacket(device->channel, packet, |
73509681 | 381 | ALIGN(sizeof(struct vstor_packet), 8), |
f638859e HJ |
382 | &bytes_recvd, &request_id); |
383 | if (ret == 0 && bytes_recvd > 0) { | |
163680b4 | 384 | DPRINT_DBG(STORVSC, "receive %d bytes - tid %llx", |
f638859e | 385 | bytes_recvd, request_id); |
163680b4 | 386 | |
163680b4 | 387 | |
d7a1bdb9 | 388 | request = (struct hv_storvsc_request *) |
f638859e | 389 | (unsigned long)request_id; |
163680b4 | 390 | |
f638859e HJ |
391 | if ((request == &stor_device->init_request) || |
392 | (request == &stor_device->reset_request)) { | |
163680b4 | 393 | |
3d8cdf22 | 394 | memcpy(&request->vstor_packet, packet, |
163680b4 | 395 | sizeof(struct vstor_packet)); |
93958465 | 396 | complete(&request->wait_event); |
163680b4 | 397 | } else { |
02e37db7 | 398 | stor_vsc_on_receive(device, |
163680b4 GKH |
399 | (struct vstor_packet *)packet, |
400 | request); | |
401 | } | |
402 | } else { | |
163680b4 GKH |
403 | break; |
404 | } | |
405 | } while (1); | |
406 | ||
02e37db7 | 407 | put_stor_device(device); |
163680b4 GKH |
408 | return; |
409 | } | |
410 | ||
f638859e | 411 | static int stor_vsc_connect_to_vsp(struct hv_device *device) |
bef4a34a | 412 | { |
b3715ee4 | 413 | struct vmstorage_channel_properties props; |
f638859e | 414 | struct storvsc_driver_object *stor_driver; |
068c5df2 | 415 | int ret; |
bef4a34a | 416 | |
786930b3 | 417 | stor_driver = drv_to_stordrv(device->device.driver); |
8c960e49 | 418 | memset(&props, 0, sizeof(struct vmstorage_channel_properties)); |
bef4a34a | 419 | |
454f18a9 | 420 | /* Open the channel */ |
f638859e HJ |
421 | ret = vmbus_open(device->channel, |
422 | stor_driver->ring_buffer_size, | |
423 | stor_driver->ring_buffer_size, | |
60f841ac GKH |
424 | (void *)&props, |
425 | sizeof(struct vmstorage_channel_properties), | |
f638859e | 426 | stor_vsc_on_channel_callback, device); |
068c5df2 GKH |
427 | |
428 | DPRINT_DBG(STORVSC, "storage props: path id %d, tgt id %d, max xfer %d", | |
d2aaba45 | 429 | props.path_id, props.target_id, props.max_transfer_bytes); |
068c5df2 GKH |
430 | |
431 | if (ret != 0) { | |
bef4a34a HJ |
432 | DPRINT_ERR(STORVSC, "unable to open channel: %d", ret); |
433 | return -1; | |
434 | } | |
435 | ||
f638859e | 436 | ret = stor_vsc_channel_init(device); |
bef4a34a HJ |
437 | |
438 | return ret; | |
439 | } | |
440 | ||
3e189519 | 441 | /* |
02e37db7 | 442 | * stor_vsc_on_device_add - Callback when the device belonging to this driver |
3d8cdf22 | 443 | * is added |
163680b4 | 444 | */ |
afa3f3d7 | 445 | int stor_vsc_on_device_add(struct hv_device *device, |
f638859e | 446 | void *additional_info) |
163680b4 | 447 | { |
f638859e | 448 | struct storvsc_device *stor_device; |
f638859e | 449 | struct storvsc_device_info *device_info; |
163680b4 GKH |
450 | int ret = 0; |
451 | ||
f638859e HJ |
452 | device_info = (struct storvsc_device_info *)additional_info; |
453 | stor_device = alloc_stor_device(device); | |
454 | if (!stor_device) { | |
163680b4 | 455 | ret = -1; |
0c3b7b2f | 456 | goto cleanup; |
163680b4 GKH |
457 | } |
458 | ||
459 | /* Save the channel properties to our storvsc channel */ | |
163680b4 GKH |
460 | |
461 | /* FIXME: */ | |
462 | /* | |
463 | * If we support more than 1 scsi channel, we need to set the | |
464 | * port number here to the scsi channel but how do we get the | |
465 | * scsi channel prior to the bus scan | |
466 | */ | |
467 | ||
f638859e | 468 | stor_device->port_number = device_info->port_number; |
163680b4 | 469 | /* Send it back up */ |
f638859e | 470 | ret = stor_vsc_connect_to_vsp(device); |
163680b4 | 471 | |
f638859e HJ |
472 | device_info->path_id = stor_device->path_id; |
473 | device_info->target_id = stor_device->target_id; | |
163680b4 GKH |
474 | |
475 | DPRINT_DBG(STORVSC, "assigned port %u, path %u target %u\n", | |
f638859e HJ |
476 | stor_device->port_number, stor_device->path_id, |
477 | stor_device->target_id); | |
163680b4 | 478 | |
0c3b7b2f | 479 | cleanup: |
163680b4 GKH |
480 | return ret; |
481 | } | |
bef4a34a | 482 | |
3e189519 | 483 | /* |
02e37db7 | 484 | * stor_vsc_on_device_remove - Callback when the our device is being removed |
068c5df2 | 485 | */ |
afa3f3d7 | 486 | int stor_vsc_on_device_remove(struct hv_device *device) |
bef4a34a | 487 | { |
f638859e | 488 | struct storvsc_device *stor_device; |
bef4a34a | 489 | |
068c5df2 | 490 | DPRINT_INFO(STORVSC, "disabling storage device (%p)...", |
ca623ad3 | 491 | device->ext); |
bef4a34a | 492 | |
f638859e | 493 | stor_device = release_stor_device(device); |
bef4a34a | 494 | |
454f18a9 BP |
495 | /* |
496 | * At this point, all outbound traffic should be disable. We | |
497 | * only allow inbound traffic (responses) to proceed so that | |
498 | * outstanding requests can be completed. | |
499 | */ | |
f638859e | 500 | while (atomic_read(&stor_device->num_outstanding_req)) { |
068c5df2 | 501 | DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", |
f638859e | 502 | atomic_read(&stor_device->num_outstanding_req)); |
b4362c9c | 503 | udelay(100); |
bef4a34a HJ |
504 | } |
505 | ||
068c5df2 | 506 | DPRINT_INFO(STORVSC, "removing storage device (%p)...", |
ca623ad3 | 507 | device->ext); |
bef4a34a | 508 | |
f638859e | 509 | stor_device = final_release_stor_device(device); |
bef4a34a | 510 | |
f638859e | 511 | DPRINT_INFO(STORVSC, "storage device (%p) safe to remove", stor_device); |
bef4a34a | 512 | |
454f18a9 | 513 | /* Close the channel */ |
f638859e | 514 | vmbus_close(device->channel); |
bef4a34a | 515 | |
f638859e | 516 | free_stor_device(stor_device); |
068c5df2 | 517 | return 0; |
454f18a9 | 518 | } |
bef4a34a | 519 | |
3e189519 | 520 | /* |
02e37db7 | 521 | * stor_vsc_on_io_request - Callback to initiate an I/O request |
068c5df2 | 522 | */ |
afa3f3d7 | 523 | int stor_vsc_on_io_request(struct hv_device *device, |
f638859e | 524 | struct hv_storvsc_request *request) |
bef4a34a | 525 | { |
f638859e | 526 | struct storvsc_device *stor_device; |
f638859e | 527 | struct vstor_packet *vstor_packet; |
068c5df2 | 528 | int ret = 0; |
bef4a34a | 529 | |
d7a1bdb9 | 530 | vstor_packet = &request->vstor_packet; |
f638859e | 531 | stor_device = get_stor_device(device); |
bef4a34a | 532 | |
068c5df2 | 533 | DPRINT_DBG(STORVSC, "enter - Device %p, DeviceExt %p, Request %p, " |
d7a1bdb9 | 534 | , device, stor_device, request); |
bef4a34a | 535 | |
473f9409 | 536 | DPRINT_DBG(STORVSC, "req %p len %d", |
d7a1bdb9 | 537 | request, request->data_buffer.len); |
bef4a34a | 538 | |
f638859e | 539 | if (!stor_device) { |
068c5df2 GKH |
540 | DPRINT_ERR(STORVSC, "unable to get stor device..." |
541 | "device being destroyed?"); | |
bef4a34a HJ |
542 | return -2; |
543 | } | |
544 | ||
bef4a34a | 545 | |
d7a1bdb9 | 546 | request->device = device; |
bef4a34a | 547 | |
a617e395 | 548 | |
f638859e | 549 | vstor_packet->flags |= REQUEST_COMPLETION_FLAG; |
bef4a34a | 550 | |
f638859e | 551 | vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); |
bef4a34a | 552 | |
bef4a34a | 553 | |
f638859e | 554 | vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE; |
bef4a34a | 555 | |
bef4a34a | 556 | |
e9e936c6 | 557 | vstor_packet->vm_srb.data_transfer_length = |
d7a1bdb9 | 558 | request->data_buffer.len; |
bef4a34a | 559 | |
f638859e | 560 | vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; |
bef4a34a | 561 | |
068c5df2 GKH |
562 | DPRINT_DBG(STORVSC, "srb - len %d port %d, path %d, target %d, " |
563 | "lun %d senselen %d cdblen %d", | |
f638859e HJ |
564 | vstor_packet->vm_srb.length, |
565 | vstor_packet->vm_srb.port_number, | |
566 | vstor_packet->vm_srb.path_id, | |
567 | vstor_packet->vm_srb.target_id, | |
568 | vstor_packet->vm_srb.lun, | |
569 | vstor_packet->vm_srb.sense_info_length, | |
570 | vstor_packet->vm_srb.cdb_length); | |
571 | ||
d7a1bdb9 | 572 | if (request->data_buffer.len) { |
f638859e | 573 | ret = vmbus_sendpacket_multipagebuffer(device->channel, |
d7a1bdb9 | 574 | &request->data_buffer, |
f638859e | 575 | vstor_packet, |
b3715ee4 | 576 | sizeof(struct vstor_packet), |
d7a1bdb9 | 577 | (unsigned long)request); |
068c5df2 | 578 | } else { |
f638859e | 579 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
b60d71e2 | 580 | sizeof(struct vstor_packet), |
d7a1bdb9 | 581 | (unsigned long)request, |
415f2287 | 582 | VM_PKT_DATA_INBAND, |
b60d71e2 | 583 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
bef4a34a HJ |
584 | } |
585 | ||
068c5df2 GKH |
586 | if (ret != 0) { |
587 | DPRINT_DBG(STORVSC, "Unable to send packet %p ret %d", | |
f638859e | 588 | vstor_packet, ret); |
bef4a34a HJ |
589 | } |
590 | ||
f638859e | 591 | atomic_inc(&stor_device->num_outstanding_req); |
bef4a34a | 592 | |
f638859e | 593 | put_stor_device(device); |
bef4a34a HJ |
594 | return ret; |
595 | } | |
596 | ||
1f91bca8 S |
597 | /* |
598 | * The channel properties uniquely specify how the device is to be | |
599 | * presented to the guest. Map this information for use by the block | |
600 | * driver. For Linux guests on Hyper-V, we emulate a scsi HBA in the guest | |
601 | * (storvsc_drv) and so scsi devices in the guest are handled by | |
602 | * native upper level Linux drivers. Consequently, Hyper-V | |
603 | * block driver, while being a generic block driver, presently does not | |
604 | * deal with anything other than devices that would need to be presented | |
605 | * to the guest as an IDE disk. | |
606 | * | |
607 | * This function maps the channel properties as embedded in the input | |
608 | * parameter device_info onto information necessary to register the | |
609 | * corresponding block device. | |
610 | * | |
611 | * Currently, there is no way to stop the emulation of the block device | |
612 | * on the host side. And so, to prevent the native IDE drivers in Linux | |
613 | * from taking over these devices (to be managedby Hyper-V block | |
614 | * driver), we will take over if need be the major of the IDE controllers. | |
615 | * | |
616 | */ | |
617 | ||
618 | int stor_vsc_get_major_info(struct storvsc_device_info *device_info, | |
619 | struct storvsc_major_info *major_info) | |
620 | { | |
621 | static bool ide0_registered; | |
622 | static bool ide1_registered; | |
623 | ||
624 | /* | |
625 | * For now we only support IDE disks. | |
626 | */ | |
627 | major_info->devname = "ide"; | |
628 | major_info->diskname = "hd"; | |
629 | ||
630 | if (device_info->path_id) { | |
631 | major_info->major = 22; | |
e46ee8ef | 632 | if (!ide1_registered) { |
1f91bca8 | 633 | major_info->do_register = true; |
1f91bca8 | 634 | ide1_registered = true; |
e46ee8ef S |
635 | } else |
636 | major_info->do_register = false; | |
637 | ||
1f91bca8 S |
638 | if (device_info->target_id) |
639 | major_info->index = 3; | |
e46ee8ef | 640 | else |
1f91bca8 S |
641 | major_info->index = 2; |
642 | ||
643 | return 0; | |
644 | } else { | |
645 | major_info->major = 3; | |
e46ee8ef | 646 | if (!ide0_registered) { |
1f91bca8 | 647 | major_info->do_register = true; |
1f91bca8 | 648 | ide0_registered = true; |
e46ee8ef S |
649 | } else |
650 | major_info->do_register = false; | |
651 | ||
1f91bca8 S |
652 | if (device_info->target_id) |
653 | major_info->index = 1; | |
654 | else | |
655 | major_info->index = 0; | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | return -ENODEV; | |
661 | } | |
662 | ||
3e189519 | 663 | /* |
02e37db7 | 664 | * stor_vsc_on_cleanup - Perform any cleanup when the driver is removed |
068c5df2 | 665 | */ |
afa3f3d7 | 666 | void stor_vsc_on_cleanup(struct hv_driver *driver) |
bef4a34a | 667 | { |
bef4a34a HJ |
668 | } |
669 |