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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> | |
bef4a34a | 20 | */ |
bef4a34a | 21 | #include <linux/init.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
bef4a34a HJ |
23 | #include <linux/module.h> |
24 | #include <linux/device.h> | |
25 | #include <linux/blkdev.h> | |
bef4a34a HJ |
26 | #include <scsi/scsi.h> |
27 | #include <scsi/scsi_cmnd.h> | |
28 | #include <scsi/scsi_host.h> | |
29 | #include <scsi/scsi_device.h> | |
30 | #include <scsi/scsi_tcq.h> | |
31 | #include <scsi/scsi_eh.h> | |
32 | #include <scsi/scsi_devinfo.h> | |
bef4a34a | 33 | #include <scsi/scsi_dbg.h> |
e3fe0bb6 | 34 | #include "hv_api.h" |
645954c5 | 35 | #include "logging.h" |
2d82f6c7 | 36 | #include "version_info.h" |
870cde80 | 37 | #include "vmbus.h" |
bb969793 | 38 | #include "storvsc_api.h" |
af3043c6 S |
39 | #include "vstorage.h" |
40 | #include "channel.h" | |
bef4a34a | 41 | |
bef4a34a | 42 | |
0f0cdc6a | 43 | static const char *driver_name = "storvsc"; |
6dec2442 S |
44 | |
45 | /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */ | |
46 | static const struct hv_guid gStorVscDeviceType = { | |
47 | .data = { | |
48 | 0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, | |
49 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f | |
50 | } | |
51 | }; | |
52 | ||
bef4a34a | 53 | struct host_device_context { |
ff568d3a GKH |
54 | /* must be 1st field |
55 | * FIXME this is a bug */ | |
ff568d3a | 56 | /* point back to our device context */ |
6bad88da | 57 | struct hv_device *device_ctx; |
ff568d3a GKH |
58 | struct kmem_cache *request_pool; |
59 | unsigned int port; | |
60 | unsigned char path; | |
61 | unsigned char target; | |
bef4a34a HJ |
62 | }; |
63 | ||
64 | struct storvsc_cmd_request { | |
ff568d3a GKH |
65 | struct list_head entry; |
66 | struct scsi_cmnd *cmd; | |
bef4a34a HJ |
67 | |
68 | unsigned int bounce_sgl_count; | |
ff568d3a | 69 | struct scatterlist *bounce_sgl; |
bef4a34a | 70 | |
0b3f6834 | 71 | struct hv_storvsc_request request; |
bef4a34a HJ |
72 | }; |
73 | ||
bef4a34a | 74 | |
6dec2442 S |
75 | /* |
76 | * stor_vsc_initialize - Main entry point | |
77 | */ | |
2b8b3582 | 78 | static int stor_vsc_initialize(struct hv_driver *driver) |
6dec2442 | 79 | { |
2e79505d | 80 | struct storvsc_driver *stor_driver; |
6dec2442 | 81 | |
ced01b0d | 82 | stor_driver = hvdr_to_stordr(driver); |
6dec2442 | 83 | |
d7a1bdb9 S |
84 | DPRINT_DBG(STORVSC, |
85 | "sizeof(struct hv_storvsc_request)=%zd " | |
6dec2442 S |
86 | "sizeof(struct vstor_packet)=%zd, " |
87 | "sizeof(struct vmscsi_request)=%zd", | |
88 | sizeof(struct hv_storvsc_request), | |
6dec2442 S |
89 | sizeof(struct vstor_packet), |
90 | sizeof(struct vmscsi_request)); | |
91 | ||
92 | /* Make sure we are at least 2 pages since 1 page is used for control */ | |
93 | ||
0f0cdc6a | 94 | driver->name = driver_name; |
6dec2442 S |
95 | memcpy(&driver->dev_type, &gStorVscDeviceType, |
96 | sizeof(struct hv_guid)); | |
97 | ||
6dec2442 S |
98 | |
99 | /* | |
100 | * Divide the ring buffer data size (which is 1 page less | |
101 | * than the ring buffer size since that page is reserved for | |
102 | * the ring buffer indices) by the max request size (which is | |
103 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) | |
104 | */ | |
105 | stor_driver->max_outstanding_req_per_channel = | |
106 | ((stor_driver->ring_buffer_size - PAGE_SIZE) / | |
107 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + | |
108 | sizeof(struct vstor_packet) + sizeof(u64), | |
109 | sizeof(u64))); | |
110 | ||
111 | DPRINT_INFO(STORVSC, "max io %u, currently %u\n", | |
112 | stor_driver->max_outstanding_req_per_channel, | |
113 | STORVSC_MAX_IO_REQUESTS); | |
114 | ||
115 | /* Setup the dispatch table */ | |
2ac5dad1 | 116 | stor_driver->base.dev_add = storvsc_dev_add; |
cb706b04 | 117 | stor_driver->base.dev_rm = storvsc_dev_remove; |
6dec2442 | 118 | |
bb465926 | 119 | stor_driver->on_io_request = storvsc_do_io; |
6dec2442 S |
120 | |
121 | return 0; | |
122 | } | |
123 | ||
454f18a9 | 124 | /* Static decl */ |
9efd21e1 | 125 | static int storvsc_probe(struct hv_device *dev); |
f281233d | 126 | static int storvsc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd); |
bef4a34a HJ |
127 | static int storvsc_device_alloc(struct scsi_device *); |
128 | static int storvsc_device_configure(struct scsi_device *); | |
129 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd); | |
415b023a | 130 | static int storvsc_remove(struct hv_device *dev); |
bef4a34a | 131 | |
ff568d3a GKH |
132 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
133 | unsigned int sg_count, | |
134 | unsigned int len); | |
135 | static void destroy_bounce_buffer(struct scatterlist *sgl, | |
136 | unsigned int sg_count); | |
bef4a34a | 137 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); |
ff568d3a GKH |
138 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
139 | struct scatterlist *bounce_sgl, | |
140 | unsigned int orig_sgl_count); | |
141 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, | |
142 | struct scatterlist *bounce_sgl, | |
143 | unsigned int orig_sgl_count); | |
bef4a34a | 144 | |
ff568d3a GKH |
145 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device *bdev, |
146 | sector_t capacity, int *info); | |
bef4a34a HJ |
147 | |
148 | ||
149 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; | |
3afc7cc3 SH |
150 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
151 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); | |
bef4a34a | 152 | |
454f18a9 | 153 | /* The one and only one */ |
2e79505d | 154 | static struct storvsc_driver g_storvsc_drv; |
bef4a34a | 155 | |
454f18a9 | 156 | /* Scsi driver */ |
bef4a34a | 157 | static struct scsi_host_template scsi_driver = { |
ff568d3a GKH |
158 | .module = THIS_MODULE, |
159 | .name = "storvsc_host_t", | |
160 | .bios_param = storvsc_get_chs, | |
161 | .queuecommand = storvsc_queuecommand, | |
162 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
163 | .slave_alloc = storvsc_device_alloc, | |
164 | .slave_configure = storvsc_device_configure, | |
165 | .cmd_per_lun = 1, | |
166 | /* 64 max_queue * 1 target */ | |
0686e4f4 | 167 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
ff568d3a | 168 | .this_id = -1, |
454f18a9 | 169 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
ff568d3a GKH |
170 | /* currently 32 */ |
171 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, | |
172 | /* | |
173 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge | |
174 | * into 1 sg element. If set, we must limit the max_segment_size to | |
175 | * PAGE_SIZE, otherwise we may get 1 sg element that represents | |
176 | * multiple | |
177 | */ | |
454f18a9 | 178 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
ff568d3a | 179 | .use_clustering = ENABLE_CLUSTERING, |
454f18a9 | 180 | /* Make sure we dont get a sg segment crosses a page boundary */ |
ff568d3a | 181 | .dma_boundary = PAGE_SIZE-1, |
bef4a34a HJ |
182 | }; |
183 | ||
184 | ||
3e189519 | 185 | /* |
ff568d3a GKH |
186 | * storvsc_drv_init - StorVsc driver initialization. |
187 | */ | |
db085777 | 188 | static int storvsc_drv_init(void) |
bef4a34a | 189 | { |
ff568d3a | 190 | int ret; |
2e79505d | 191 | struct storvsc_driver *storvsc_drv_obj = &g_storvsc_drv; |
4af27d70 | 192 | struct hv_driver *drv = &g_storvsc_drv.base; |
bef4a34a | 193 | |
8a046024 | 194 | storvsc_drv_obj->ring_buffer_size = storvsc_ringbuffer_size; |
bef4a34a | 195 | |
454f18a9 | 196 | /* Callback to client driver to complete the initialization */ |
db085777 | 197 | stor_vsc_initialize(&storvsc_drv_obj->base); |
bef4a34a | 198 | |
ff568d3a | 199 | DPRINT_INFO(STORVSC_DRV, |
1e05d88e | 200 | "max outstanding reqs %u", |
8a046024 | 201 | storvsc_drv_obj->max_outstanding_req_per_channel); |
ff568d3a | 202 | |
8a046024 | 203 | if (storvsc_drv_obj->max_outstanding_req_per_channel < |
ff568d3a GKH |
204 | STORVSC_MAX_IO_REQUESTS) { |
205 | DPRINT_ERR(STORVSC_DRV, | |
206 | "The number of outstanding io requests (%d) " | |
207 | "is larger than that supported (%d) internally.", | |
208 | STORVSC_MAX_IO_REQUESTS, | |
8a046024 | 209 | storvsc_drv_obj->max_outstanding_req_per_channel); |
bef4a34a HJ |
210 | return -1; |
211 | } | |
212 | ||
150f9398 | 213 | drv->driver.name = storvsc_drv_obj->base.name; |
bef4a34a | 214 | |
9efd21e1 | 215 | drv->probe = storvsc_probe; |
415b023a | 216 | drv->remove = storvsc_remove; |
bef4a34a | 217 | |
454f18a9 | 218 | /* The driver belongs to vmbus */ |
150f9398 | 219 | ret = vmbus_child_driver_register(&drv->driver); |
bef4a34a | 220 | |
bef4a34a HJ |
221 | return ret; |
222 | } | |
223 | ||
af3043c6 | 224 | |
12cb12ef | 225 | static int stor_vsc_on_host_reset(struct hv_device *device) |
af3043c6 S |
226 | { |
227 | struct storvsc_device *stor_device; | |
d7a1bdb9 | 228 | struct hv_storvsc_request *request; |
af3043c6 | 229 | struct vstor_packet *vstor_packet; |
93958465 | 230 | int ret, t; |
af3043c6 S |
231 | |
232 | DPRINT_INFO(STORVSC, "resetting host adapter..."); | |
233 | ||
234 | stor_device = get_stor_device(device); | |
235 | if (!stor_device) { | |
236 | DPRINT_ERR(STORVSC, "unable to get stor device..." | |
237 | "device being destroyed?"); | |
238 | return -1; | |
239 | } | |
240 | ||
241 | request = &stor_device->reset_request; | |
242 | vstor_packet = &request->vstor_packet; | |
243 | ||
93958465 | 244 | init_completion(&request->wait_event); |
af3043c6 S |
245 | |
246 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; | |
247 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; | |
248 | vstor_packet->vm_srb.path_id = stor_device->path_id; | |
249 | ||
af3043c6 S |
250 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
251 | sizeof(struct vstor_packet), | |
252 | (unsigned long)&stor_device->reset_request, | |
253 | VM_PKT_DATA_INBAND, | |
254 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
255 | if (ret != 0) { | |
256 | DPRINT_ERR(STORVSC, "Unable to send reset packet %p ret %d", | |
257 | vstor_packet, ret); | |
258 | goto cleanup; | |
259 | } | |
260 | ||
93958465 S |
261 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
262 | if (t == 0) { | |
af3043c6 S |
263 | ret = -ETIMEDOUT; |
264 | goto cleanup; | |
265 | } | |
266 | ||
267 | DPRINT_INFO(STORVSC, "host adapter reset completed"); | |
268 | ||
269 | /* | |
270 | * At this point, all outstanding requests in the adapter | |
271 | * should have been flushed out and return to us | |
272 | */ | |
273 | ||
274 | cleanup: | |
275 | put_stor_device(device); | |
276 | return ret; | |
277 | } | |
278 | ||
bef4a34a HJ |
279 | static int storvsc_drv_exit_cb(struct device *dev, void *data) |
280 | { | |
281 | struct device **curr = (struct device **)data; | |
282 | *curr = dev; | |
454f18a9 | 283 | return 1; /* stop iterating */ |
bef4a34a HJ |
284 | } |
285 | ||
bd1de709 | 286 | static void storvsc_drv_exit(void) |
bef4a34a | 287 | { |
2e79505d | 288 | struct storvsc_driver *storvsc_drv_obj = &g_storvsc_drv; |
4af27d70 | 289 | struct hv_driver *drv = &g_storvsc_drv.base; |
ff568d3a | 290 | struct device *current_dev = NULL; |
2295ba2e | 291 | int ret; |
bef4a34a | 292 | |
ff568d3a | 293 | while (1) { |
bef4a34a HJ |
294 | current_dev = NULL; |
295 | ||
454f18a9 | 296 | /* Get the device */ |
150f9398 | 297 | ret = driver_for_each_device(&drv->driver, NULL, |
2295ba2e BP |
298 | (void *) ¤t_dev, |
299 | storvsc_drv_exit_cb); | |
300 | ||
301 | if (ret) | |
302 | DPRINT_WARN(STORVSC_DRV, | |
303 | "driver_for_each_device returned %d", ret); | |
bef4a34a HJ |
304 | |
305 | if (current_dev == NULL) | |
306 | break; | |
307 | ||
454f18a9 | 308 | /* Initiate removal from the top-down */ |
bef4a34a HJ |
309 | device_unregister(current_dev); |
310 | } | |
311 | ||
ca623ad3 HZ |
312 | if (storvsc_drv_obj->base.cleanup) |
313 | storvsc_drv_obj->base.cleanup(&storvsc_drv_obj->base); | |
bef4a34a | 314 | |
150f9398 | 315 | vmbus_child_driver_unregister(&drv->driver); |
bef4a34a HJ |
316 | return; |
317 | } | |
318 | ||
3e189519 | 319 | /* |
ff568d3a GKH |
320 | * storvsc_probe - Add a new device for this driver |
321 | */ | |
9efd21e1 | 322 | static int storvsc_probe(struct hv_device *device) |
bef4a34a | 323 | { |
ff568d3a | 324 | int ret; |
2e79505d | 325 | struct storvsc_driver *storvsc_drv_obj = |
9efd21e1 | 326 | drv_to_stordrv(device->device.driver); |
bef4a34a HJ |
327 | struct Scsi_Host *host; |
328 | struct host_device_context *host_device_ctx; | |
9f0c7d2c | 329 | struct storvsc_device_info device_info; |
bef4a34a | 330 | |
ca623ad3 | 331 | if (!storvsc_drv_obj->base.dev_add) |
bef4a34a HJ |
332 | return -1; |
333 | ||
ff568d3a GKH |
334 | host = scsi_host_alloc(&scsi_driver, |
335 | sizeof(struct host_device_context)); | |
336 | if (!host) { | |
bef4a34a HJ |
337 | DPRINT_ERR(STORVSC_DRV, "unable to allocate scsi host object"); |
338 | return -ENOMEM; | |
339 | } | |
340 | ||
9efd21e1 | 341 | dev_set_drvdata(&device->device, host); |
bef4a34a | 342 | |
ff568d3a | 343 | host_device_ctx = (struct host_device_context *)host->hostdata; |
bef4a34a HJ |
344 | memset(host_device_ctx, 0, sizeof(struct host_device_context)); |
345 | ||
346 | host_device_ctx->port = host->host_no; | |
9efd21e1 | 347 | host_device_ctx->device_ctx = device; |
bef4a34a | 348 | |
bef4a34a | 349 | host_device_ctx->request_pool = |
9efd21e1 | 350 | kmem_cache_create(dev_name(&device->device), |
1e05d88e | 351 | sizeof(struct storvsc_cmd_request), 0, |
ff568d3a GKH |
352 | SLAB_HWCACHE_ALIGN, NULL); |
353 | ||
354 | if (!host_device_ctx->request_pool) { | |
bef4a34a | 355 | scsi_host_put(host); |
bef4a34a HJ |
356 | return -ENOMEM; |
357 | } | |
358 | ||
8a046024 | 359 | device_info.port_number = host->host_no; |
454f18a9 | 360 | /* Call to the vsc driver to add the device */ |
9efd21e1 S |
361 | ret = storvsc_drv_obj->base.dev_add(device, (void *)&device_info); |
362 | ||
ff568d3a | 363 | if (ret != 0) { |
bef4a34a HJ |
364 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi vsc device"); |
365 | kmem_cache_destroy(host_device_ctx->request_pool); | |
366 | scsi_host_put(host); | |
bef4a34a HJ |
367 | return -1; |
368 | } | |
369 | ||
454f18a9 | 370 | /* host_device_ctx->port = device_info.PortNumber; */ |
8a046024 HJ |
371 | host_device_ctx->path = device_info.path_id; |
372 | host_device_ctx->target = device_info.target_id; | |
bef4a34a | 373 | |
ff568d3a GKH |
374 | /* max # of devices per target */ |
375 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; | |
376 | /* max # of targets per channel */ | |
377 | host->max_id = STORVSC_MAX_TARGETS; | |
378 | /* max # of channels */ | |
379 | host->max_channel = STORVSC_MAX_CHANNELS - 1; | |
bef4a34a | 380 | |
454f18a9 | 381 | /* Register the HBA and start the scsi bus scan */ |
9efd21e1 | 382 | ret = scsi_add_host(host, &device->device); |
ff568d3a | 383 | if (ret != 0) { |
bef4a34a HJ |
384 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi host device"); |
385 | ||
9efd21e1 | 386 | storvsc_drv_obj->base.dev_rm(device); |
bef4a34a HJ |
387 | |
388 | kmem_cache_destroy(host_device_ctx->request_pool); | |
389 | scsi_host_put(host); | |
bef4a34a HJ |
390 | return -1; |
391 | } | |
392 | ||
393 | scsi_scan_host(host); | |
bef4a34a HJ |
394 | return ret; |
395 | } | |
396 | ||
3e189519 | 397 | /* |
ff568d3a GKH |
398 | * storvsc_remove - Callback when our device is removed |
399 | */ | |
415b023a | 400 | static int storvsc_remove(struct hv_device *dev) |
bef4a34a | 401 | { |
2e79505d | 402 | struct storvsc_driver *storvsc_drv_obj = |
415b023a S |
403 | drv_to_stordrv(dev->device.driver); |
404 | struct Scsi_Host *host = dev_get_drvdata(&dev->device); | |
ff568d3a GKH |
405 | struct host_device_context *host_device_ctx = |
406 | (struct host_device_context *)host->hostdata; | |
bef4a34a | 407 | |
ff568d3a GKH |
408 | /* |
409 | * Call to the vsc driver to let it know that the device is being | |
410 | * removed | |
411 | */ | |
415b023a | 412 | storvsc_drv_obj->base.dev_rm(dev); |
bef4a34a | 413 | |
ff568d3a | 414 | if (host_device_ctx->request_pool) { |
bef4a34a HJ |
415 | kmem_cache_destroy(host_device_ctx->request_pool); |
416 | host_device_ctx->request_pool = NULL; | |
417 | } | |
418 | ||
419 | DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); | |
420 | scsi_remove_host(host); | |
421 | ||
422 | DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); | |
423 | scsi_host_put(host); | |
1c8d0b7d | 424 | return 0; |
bef4a34a HJ |
425 | } |
426 | ||
3e189519 | 427 | /* |
ff568d3a GKH |
428 | * storvsc_commmand_completion - Command completion processing |
429 | */ | |
0b3f6834 | 430 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) |
bef4a34a | 431 | { |
ff568d3a | 432 | struct storvsc_cmd_request *cmd_request = |
d7a1bdb9 | 433 | (struct storvsc_cmd_request *)request->context; |
bef4a34a | 434 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
ff568d3a GKH |
435 | struct host_device_context *host_device_ctx = |
436 | (struct host_device_context *)scmnd->device->host->hostdata; | |
bef4a34a | 437 | void (*scsi_done_fn)(struct scsi_cmnd *); |
bef4a34a | 438 | struct scsi_sense_hdr sense_hdr; |
6dc3f0a7 | 439 | struct vmscsi_request *vm_srb; |
bef4a34a | 440 | |
b856e738 BP |
441 | /* ASSERT(request == &cmd_request->request); */ |
442 | /* ASSERT(scmnd); */ | |
443 | /* ASSERT((unsigned long)scmnd->host_scribble == */ | |
444 | /* (unsigned long)cmd_request); */ | |
445 | /* ASSERT(scmnd->scsi_done); */ | |
bef4a34a | 446 | |
ff568d3a GKH |
447 | if (cmd_request->bounce_sgl_count) { |
448 | /* using bounce buffer */ | |
454f18a9 | 449 | /* printk("copy_from_bounce_buffer\n"); */ |
bef4a34a | 450 | |
454f18a9 | 451 | /* FIXME: We can optimize on writes by just skipping this */ |
ff568d3a GKH |
452 | copy_from_bounce_buffer(scsi_sglist(scmnd), |
453 | cmd_request->bounce_sgl, | |
454 | scsi_sg_count(scmnd)); | |
455 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
456 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
457 | } |
458 | ||
d7a1bdb9 | 459 | vm_srb = &request->vstor_packet.vm_srb; |
6dc3f0a7 | 460 | scmnd->result = vm_srb->scsi_status; |
bef4a34a | 461 | |
ff568d3a GKH |
462 | if (scmnd->result) { |
463 | if (scsi_normalize_sense(scmnd->sense_buffer, | |
6f461cc4 | 464 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) |
bef4a34a | 465 | scsi_print_sense_hdr("storvsc", &sense_hdr); |
bef4a34a HJ |
466 | } |
467 | ||
8a046024 HJ |
468 | /* ASSERT(request->BytesXfer <= request->data_buffer.Length); */ |
469 | scsi_set_resid(scmnd, | |
d7a1bdb9 | 470 | request->data_buffer.len - |
e9e936c6 | 471 | vm_srb->data_transfer_length); |
bef4a34a HJ |
472 | |
473 | scsi_done_fn = scmnd->scsi_done; | |
474 | ||
475 | scmnd->host_scribble = NULL; | |
476 | scmnd->scsi_done = NULL; | |
477 | ||
454f18a9 | 478 | /* !!DO NOT MODIFY the scmnd after this call */ |
bef4a34a HJ |
479 | scsi_done_fn(scmnd); |
480 | ||
481 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); | |
bef4a34a HJ |
482 | } |
483 | ||
484 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
485 | { | |
ff568d3a | 486 | int i; |
bef4a34a | 487 | |
454f18a9 | 488 | /* No need to check */ |
bef4a34a HJ |
489 | if (sg_count < 2) |
490 | return -1; | |
491 | ||
454f18a9 | 492 | /* We have at least 2 sg entries */ |
ff568d3a GKH |
493 | for (i = 0; i < sg_count; i++) { |
494 | if (i == 0) { | |
495 | /* make sure 1st one does not have hole */ | |
bef4a34a HJ |
496 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) |
497 | return i; | |
ff568d3a GKH |
498 | } else if (i == sg_count - 1) { |
499 | /* make sure last one does not have hole */ | |
bef4a34a HJ |
500 | if (sgl[i].offset != 0) |
501 | return i; | |
ff568d3a GKH |
502 | } else { |
503 | /* make sure no hole in the middle */ | |
bef4a34a | 504 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) |
bef4a34a | 505 | return i; |
bef4a34a HJ |
506 | } |
507 | } | |
508 | return -1; | |
509 | } | |
510 | ||
ff568d3a GKH |
511 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
512 | unsigned int sg_count, | |
513 | unsigned int len) | |
bef4a34a HJ |
514 | { |
515 | int i; | |
ff568d3a GKH |
516 | int num_pages; |
517 | struct scatterlist *bounce_sgl; | |
bef4a34a HJ |
518 | struct page *page_buf; |
519 | ||
73509681 | 520 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; |
bef4a34a | 521 | |
06da0bc8 | 522 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); |
bef4a34a | 523 | if (!bounce_sgl) |
bef4a34a | 524 | return NULL; |
bef4a34a | 525 | |
ff568d3a | 526 | for (i = 0; i < num_pages; i++) { |
bef4a34a HJ |
527 | page_buf = alloc_page(GFP_ATOMIC); |
528 | if (!page_buf) | |
bef4a34a | 529 | goto cleanup; |
bef4a34a | 530 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); |
bef4a34a HJ |
531 | } |
532 | ||
533 | return bounce_sgl; | |
534 | ||
535 | cleanup: | |
536 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
537 | return NULL; | |
538 | } | |
539 | ||
ff568d3a GKH |
540 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
541 | unsigned int sg_count) | |
bef4a34a HJ |
542 | { |
543 | int i; | |
544 | struct page *page_buf; | |
545 | ||
ff568d3a GKH |
546 | for (i = 0; i < sg_count; i++) { |
547 | page_buf = sg_page((&sgl[i])); | |
548 | if (page_buf != NULL) | |
bef4a34a | 549 | __free_page(page_buf); |
bef4a34a HJ |
550 | } |
551 | ||
552 | kfree(sgl); | |
553 | } | |
554 | ||
454f18a9 | 555 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ |
ff568d3a GKH |
556 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, |
557 | struct scatterlist *bounce_sgl, | |
558 | unsigned int orig_sgl_count) | |
bef4a34a | 559 | { |
ff568d3a GKH |
560 | int i; |
561 | int j = 0; | |
bef4a34a HJ |
562 | unsigned long src, dest; |
563 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
564 | unsigned int total_copied = 0; |
565 | unsigned long bounce_addr = 0; | |
566 | unsigned long src_addr = 0; | |
bef4a34a HJ |
567 | unsigned long flags; |
568 | ||
569 | local_irq_save(flags); | |
570 | ||
ff568d3a GKH |
571 | for (i = 0; i < orig_sgl_count; i++) { |
572 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
573 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
574 | src = src_addr; |
575 | srclen = orig_sgl[i].length; | |
576 | ||
b856e738 | 577 | /* ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); */ |
bef4a34a | 578 | |
0c47a70a | 579 | if (bounce_addr == 0) |
bef4a34a | 580 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 581 | |
ff568d3a | 582 | while (srclen) { |
454f18a9 | 583 | /* assume bounce offset always == 0 */ |
bef4a34a HJ |
584 | dest = bounce_addr + bounce_sgl[j].length; |
585 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
586 | ||
fc6a4b26 | 587 | copylen = min(srclen, destlen); |
ff568d3a | 588 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
589 | |
590 | total_copied += copylen; | |
591 | bounce_sgl[j].length += copylen; | |
592 | srclen -= copylen; | |
593 | src += copylen; | |
594 | ||
ff568d3a GKH |
595 | if (bounce_sgl[j].length == PAGE_SIZE) { |
596 | /* full..move to next entry */ | |
597 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
598 | j++; |
599 | ||
454f18a9 | 600 | /* if we need to use another bounce buffer */ |
ff568d3a | 601 | if (srclen || i != orig_sgl_count - 1) |
bef4a34a | 602 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
603 | } else if (srclen == 0 && i == orig_sgl_count - 1) { |
604 | /* unmap the last bounce that is < PAGE_SIZE */ | |
605 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
606 | } |
607 | } | |
608 | ||
ff568d3a | 609 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); |
bef4a34a HJ |
610 | } |
611 | ||
612 | local_irq_restore(flags); | |
613 | ||
614 | return total_copied; | |
615 | } | |
616 | ||
454f18a9 | 617 | /* Assume the original sgl has enough room */ |
ff568d3a GKH |
618 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
619 | struct scatterlist *bounce_sgl, | |
620 | unsigned int orig_sgl_count) | |
bef4a34a | 621 | { |
ff568d3a GKH |
622 | int i; |
623 | int j = 0; | |
bef4a34a HJ |
624 | unsigned long src, dest; |
625 | unsigned int srclen, destlen, copylen; | |
ff568d3a GKH |
626 | unsigned int total_copied = 0; |
627 | unsigned long bounce_addr = 0; | |
628 | unsigned long dest_addr = 0; | |
bef4a34a HJ |
629 | unsigned long flags; |
630 | ||
631 | local_irq_save(flags); | |
632 | ||
ff568d3a GKH |
633 | for (i = 0; i < orig_sgl_count; i++) { |
634 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), | |
635 | KM_IRQ0) + orig_sgl[i].offset; | |
bef4a34a HJ |
636 | dest = dest_addr; |
637 | destlen = orig_sgl[i].length; | |
b856e738 | 638 | /* ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); */ |
bef4a34a | 639 | |
0c47a70a | 640 | if (bounce_addr == 0) |
bef4a34a | 641 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a | 642 | |
ff568d3a | 643 | while (destlen) { |
bef4a34a HJ |
644 | src = bounce_addr + bounce_sgl[j].offset; |
645 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
646 | ||
fc6a4b26 | 647 | copylen = min(srclen, destlen); |
ff568d3a | 648 | memcpy((void *)dest, (void *)src, copylen); |
bef4a34a HJ |
649 | |
650 | total_copied += copylen; | |
651 | bounce_sgl[j].offset += copylen; | |
652 | destlen -= copylen; | |
653 | dest += copylen; | |
654 | ||
ff568d3a GKH |
655 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { |
656 | /* full */ | |
657 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
658 | j++; |
659 | ||
454f18a9 | 660 | /* if we need to use another bounce buffer */ |
ff568d3a | 661 | if (destlen || i != orig_sgl_count - 1) |
bef4a34a | 662 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
ff568d3a GKH |
663 | } else if (destlen == 0 && i == orig_sgl_count - 1) { |
664 | /* unmap the last bounce that is < PAGE_SIZE */ | |
665 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); | |
bef4a34a HJ |
666 | } |
667 | } | |
668 | ||
ff568d3a GKH |
669 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), |
670 | KM_IRQ0); | |
bef4a34a HJ |
671 | } |
672 | ||
673 | local_irq_restore(flags); | |
674 | ||
675 | return total_copied; | |
676 | } | |
677 | ||
3e189519 | 678 | /* |
ff568d3a GKH |
679 | * storvsc_queuecommand - Initiate command processing |
680 | */ | |
f281233d | 681 | static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, |
ff568d3a | 682 | void (*done)(struct scsi_cmnd *)) |
bef4a34a | 683 | { |
ff568d3a GKH |
684 | int ret; |
685 | struct host_device_context *host_device_ctx = | |
686 | (struct host_device_context *)scmnd->device->host->hostdata; | |
6bad88da | 687 | struct hv_device *device_ctx = host_device_ctx->device_ctx; |
2e79505d | 688 | struct storvsc_driver *storvsc_drv_obj = |
28e7f2a8 | 689 | drv_to_stordrv(device_ctx->device.driver); |
0b3f6834 | 690 | struct hv_storvsc_request *request; |
bef4a34a | 691 | struct storvsc_cmd_request *cmd_request; |
ff568d3a | 692 | unsigned int request_size = 0; |
bef4a34a HJ |
693 | int i; |
694 | struct scatterlist *sgl; | |
77c5ceaf | 695 | unsigned int sg_count = 0; |
12fbd416 | 696 | struct vmscsi_request *vm_srb; |
bef4a34a | 697 | |
ff568d3a GKH |
698 | DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d " |
699 | "queue depth %d tagged %d", scmnd, scmnd->sc_data_direction, | |
700 | scsi_sg_count(scmnd), scsi_sglist(scmnd), | |
701 | scsi_bufflen(scmnd), scmnd->device->queue_depth, | |
702 | scmnd->device->tagged_supported); | |
bef4a34a | 703 | |
454f18a9 | 704 | /* If retrying, no need to prep the cmd */ |
ff568d3a | 705 | if (scmnd->host_scribble) { |
b856e738 | 706 | /* ASSERT(scmnd->scsi_done != NULL); */ |
bef4a34a | 707 | |
ff568d3a GKH |
708 | cmd_request = |
709 | (struct storvsc_cmd_request *)scmnd->host_scribble; | |
710 | DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", | |
711 | scmnd, cmd_request); | |
bef4a34a HJ |
712 | |
713 | goto retry_request; | |
714 | } | |
715 | ||
b856e738 BP |
716 | /* ASSERT(scmnd->scsi_done == NULL); */ |
717 | /* ASSERT(scmnd->host_scribble == NULL); */ | |
bef4a34a HJ |
718 | |
719 | scmnd->scsi_done = done; | |
720 | ||
721 | request_size = sizeof(struct storvsc_cmd_request); | |
722 | ||
c7a9a484 | 723 | cmd_request = kmem_cache_zalloc(host_device_ctx->request_pool, |
ff568d3a GKH |
724 | GFP_ATOMIC); |
725 | if (!cmd_request) { | |
726 | DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - unable to allocate " | |
727 | "storvsc_cmd_request...marking queue busy", scmnd); | |
bef4a34a HJ |
728 | scmnd->scsi_done = NULL; |
729 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
730 | } | |
731 | ||
454f18a9 | 732 | /* Setup the cmd request */ |
bef4a34a HJ |
733 | cmd_request->bounce_sgl_count = 0; |
734 | cmd_request->bounce_sgl = NULL; | |
735 | cmd_request->cmd = scmnd; | |
736 | ||
ff568d3a | 737 | scmnd->host_scribble = (unsigned char *)cmd_request; |
bef4a34a HJ |
738 | |
739 | request = &cmd_request->request; | |
d7a1bdb9 | 740 | vm_srb = &request->vstor_packet.vm_srb; |
bef4a34a | 741 | |
1e05d88e | 742 | DPRINT_DBG(STORVSC_DRV, "req %p size %d", request, request_size); |
bef4a34a | 743 | |
454f18a9 | 744 | /* Build the SRB */ |
ff568d3a | 745 | switch (scmnd->sc_data_direction) { |
bef4a34a | 746 | case DMA_TO_DEVICE: |
12fbd416 | 747 | vm_srb->data_in = WRITE_TYPE; |
bef4a34a HJ |
748 | break; |
749 | case DMA_FROM_DEVICE: | |
12fbd416 | 750 | vm_srb->data_in = READ_TYPE; |
bef4a34a HJ |
751 | break; |
752 | default: | |
12fbd416 | 753 | vm_srb->data_in = UNKNOWN_TYPE; |
bef4a34a HJ |
754 | break; |
755 | } | |
756 | ||
d7a1bdb9 S |
757 | request->on_io_completion = storvsc_commmand_completion; |
758 | request->context = cmd_request;/* scmnd; */ | |
bef4a34a | 759 | |
454f18a9 | 760 | /* request->PortId = scmnd->device->channel; */ |
124661de | 761 | vm_srb->port_number = host_device_ctx->port; |
735625fe | 762 | vm_srb->path_id = scmnd->device->channel; |
b4dba0a3 | 763 | vm_srb->target_id = scmnd->device->id; |
fc3967b0 | 764 | vm_srb->lun = scmnd->device->lun; |
bef4a34a | 765 | |
b856e738 | 766 | /* ASSERT(scmnd->cmd_len <= 16); */ |
473f9409 | 767 | vm_srb->cdb_length = scmnd->cmd_len; |
373dd8a9 S |
768 | |
769 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); | |
bef4a34a | 770 | |
d7a1bdb9 | 771 | request->sense_buffer = scmnd->sense_buffer; |
bef4a34a HJ |
772 | |
773 | ||
d7a1bdb9 | 774 | request->data_buffer.len = scsi_bufflen(scmnd); |
ff568d3a GKH |
775 | if (scsi_sg_count(scmnd)) { |
776 | sgl = (struct scatterlist *)scsi_sglist(scmnd); | |
77c5ceaf | 777 | sg_count = scsi_sg_count(scmnd); |
bef4a34a | 778 | |
454f18a9 | 779 | /* check if we need to bounce the sgl */ |
ff568d3a GKH |
780 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { |
781 | DPRINT_INFO(STORVSC_DRV, | |
782 | "need to bounce buffer for this scmnd %p", | |
783 | scmnd); | |
784 | cmd_request->bounce_sgl = | |
785 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), | |
786 | scsi_bufflen(scmnd)); | |
787 | if (!cmd_request->bounce_sgl) { | |
788 | DPRINT_ERR(STORVSC_DRV, | |
789 | "unable to create bounce buffer for " | |
790 | "this scmnd %p", scmnd); | |
bef4a34a HJ |
791 | |
792 | scmnd->scsi_done = NULL; | |
793 | scmnd->host_scribble = NULL; | |
ff568d3a GKH |
794 | kmem_cache_free(host_device_ctx->request_pool, |
795 | cmd_request); | |
bef4a34a HJ |
796 | |
797 | return SCSI_MLQUEUE_HOST_BUSY; | |
798 | } | |
799 | ||
ff568d3a | 800 | cmd_request->bounce_sgl_count = |
73509681 | 801 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> |
ff568d3a | 802 | PAGE_SHIFT; |
bef4a34a | 803 | |
ff568d3a GKH |
804 | /* |
805 | * FIXME: We can optimize on reads by just skipping | |
806 | * this | |
807 | */ | |
808 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, | |
809 | scsi_sg_count(scmnd)); | |
bef4a34a HJ |
810 | |
811 | sgl = cmd_request->bounce_sgl; | |
77c5ceaf | 812 | sg_count = cmd_request->bounce_sgl_count; |
bef4a34a HJ |
813 | } |
814 | ||
d7a1bdb9 | 815 | request->data_buffer.offset = sgl[0].offset; |
bef4a34a | 816 | |
77c5ceaf | 817 | for (i = 0; i < sg_count; i++) { |
0686e4f4 | 818 | DPRINT_DBG(STORVSC_DRV, "sgl[%d] len %d offset %d\n", |
ff568d3a | 819 | i, sgl[i].length, sgl[i].offset); |
d7a1bdb9 | 820 | request->data_buffer.pfn_array[i] = |
77c5ceaf | 821 | page_to_pfn(sg_page((&sgl[i]))); |
bef4a34a | 822 | } |
ff568d3a | 823 | } else if (scsi_sglist(scmnd)) { |
b856e738 | 824 | /* ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); */ |
d7a1bdb9 | 825 | request->data_buffer.offset = |
ff568d3a | 826 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
d7a1bdb9 | 827 | request->data_buffer.pfn_array[0] = |
ff568d3a | 828 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
bef4a34a | 829 | } |
bef4a34a HJ |
830 | |
831 | retry_request: | |
454f18a9 | 832 | /* Invokes the vsc to start an IO */ |
6bad88da | 833 | ret = storvsc_drv_obj->on_io_request(device_ctx, |
ff568d3a GKH |
834 | &cmd_request->request); |
835 | if (ret == -1) { | |
836 | /* no more space */ | |
837 | DPRINT_ERR(STORVSC_DRV, | |
838 | "scmnd (%p) - queue FULL...marking queue busy", | |
839 | scmnd); | |
840 | ||
841 | if (cmd_request->bounce_sgl_count) { | |
842 | /* | |
843 | * FIXME: We can optimize on writes by just skipping | |
844 | * this | |
845 | */ | |
846 | copy_from_bounce_buffer(scsi_sglist(scmnd), | |
847 | cmd_request->bounce_sgl, | |
848 | scsi_sg_count(scmnd)); | |
849 | destroy_bounce_buffer(cmd_request->bounce_sgl, | |
850 | cmd_request->bounce_sgl_count); | |
bef4a34a HJ |
851 | } |
852 | ||
853 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); | |
854 | ||
855 | scmnd->scsi_done = NULL; | |
856 | scmnd->host_scribble = NULL; | |
857 | ||
858 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
859 | } | |
860 | ||
bef4a34a HJ |
861 | return ret; |
862 | } | |
863 | ||
f281233d JG |
864 | static DEF_SCSI_QCMD(storvsc_queuecommand) |
865 | ||
ff568d3a GKH |
866 | static int storvsc_merge_bvec(struct request_queue *q, |
867 | struct bvec_merge_data *bmd, struct bio_vec *bvec) | |
bef4a34a | 868 | { |
ff568d3a GKH |
869 | /* checking done by caller. */ |
870 | return bvec->bv_len; | |
bef4a34a | 871 | } |
bef4a34a | 872 | |
3e189519 | 873 | /* |
ff568d3a GKH |
874 | * storvsc_device_configure - Configure the specified scsi device |
875 | */ | |
bef4a34a HJ |
876 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
877 | { | |
ff568d3a GKH |
878 | DPRINT_DBG(STORVSC_DRV, "sdev (%p) - setting device flag to %d", |
879 | sdevice, BLIST_SPARSELUN); | |
880 | /* | |
881 | * This enables luns to be located sparsely. Otherwise, we may not | |
882 | * discovered them. | |
883 | */ | |
bef4a34a | 884 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; |
bef4a34a HJ |
885 | return 0; |
886 | } | |
887 | ||
888 | static int storvsc_device_configure(struct scsi_device *sdevice) | |
889 | { | |
ff568d3a GKH |
890 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - curr queue depth %d", sdevice, |
891 | sdevice->queue_depth); | |
bef4a34a | 892 | |
ff568d3a GKH |
893 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting queue depth to %d", |
894 | sdevice, STORVSC_MAX_IO_REQUESTS); | |
895 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, | |
896 | STORVSC_MAX_IO_REQUESTS); | |
bef4a34a | 897 | |
ff568d3a GKH |
898 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld", |
899 | sdevice, PAGE_SIZE); | |
bef4a34a HJ |
900 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
901 | ||
ff568d3a GKH |
902 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", |
903 | sdevice); | |
bef4a34a HJ |
904 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
905 | ||
906 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
454f18a9 | 907 | /* sdevice->timeout = (2000 * HZ);//(75 * HZ); */ |
bef4a34a HJ |
908 | |
909 | return 0; | |
910 | } | |
911 | ||
3e189519 | 912 | /* |
ff568d3a GKH |
913 | * storvsc_host_reset_handler - Reset the scsi HBA |
914 | */ | |
bef4a34a HJ |
915 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
916 | { | |
ff568d3a GKH |
917 | int ret; |
918 | struct host_device_context *host_device_ctx = | |
919 | (struct host_device_context *)scmnd->device->host->hostdata; | |
6bad88da | 920 | struct hv_device *device_ctx = host_device_ctx->device_ctx; |
bef4a34a | 921 | |
ff568d3a | 922 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", |
6bad88da | 923 | scmnd->device, device_ctx); |
bef4a34a | 924 | |
454f18a9 | 925 | /* Invokes the vsc to reset the host/bus */ |
6bad88da | 926 | ret = stor_vsc_on_host_reset(device_ctx); |
83c720ea | 927 | if (ret != 0) |
bef4a34a | 928 | return ret; |
bef4a34a | 929 | |
ff568d3a | 930 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", |
6bad88da | 931 | scmnd->device, device_ctx); |
bef4a34a | 932 | |
bef4a34a HJ |
933 | return ret; |
934 | } | |
935 | ||
ff568d3a GKH |
936 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
937 | sector_t capacity, int *info) | |
bef4a34a HJ |
938 | { |
939 | sector_t total_sectors = capacity; | |
ff568d3a GKH |
940 | sector_t cylinder_times_heads = 0; |
941 | sector_t temp = 0; | |
bef4a34a | 942 | |
ff568d3a GKH |
943 | int sectors_per_track = 0; |
944 | int heads = 0; | |
945 | int cylinders = 0; | |
946 | int rem = 0; | |
bef4a34a | 947 | |
ff568d3a GKH |
948 | if (total_sectors > (65535 * 16 * 255)) |
949 | total_sectors = (65535 * 16 * 255); | |
bef4a34a | 950 | |
ff568d3a GKH |
951 | if (total_sectors >= (65535 * 16 * 63)) { |
952 | sectors_per_track = 255; | |
953 | heads = 16; | |
bef4a34a HJ |
954 | |
955 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
956 | /* sector_div stores the quotient in cylinder_times_heads */ |
957 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
958 | } else { | |
959 | sectors_per_track = 17; | |
bef4a34a HJ |
960 | |
961 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
962 | /* sector_div stores the quotient in cylinder_times_heads */ |
963 | rem = sector_div(cylinder_times_heads, sectors_per_track); | |
bef4a34a HJ |
964 | |
965 | temp = cylinder_times_heads + 1023; | |
ff568d3a GKH |
966 | /* sector_div stores the quotient in temp */ |
967 | rem = sector_div(temp, 1024); | |
bef4a34a HJ |
968 | |
969 | heads = temp; | |
970 | ||
ff568d3a GKH |
971 | if (heads < 4) |
972 | heads = 4; | |
bef4a34a | 973 | |
ff568d3a GKH |
974 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { |
975 | sectors_per_track = 31; | |
976 | heads = 16; | |
bef4a34a HJ |
977 | |
978 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
979 | /* |
980 | * sector_div stores the quotient in | |
981 | * cylinder_times_heads | |
982 | */ | |
983 | rem = sector_div(cylinder_times_heads, | |
984 | sectors_per_track); | |
985 | } | |
bef4a34a | 986 | |
ff568d3a GKH |
987 | if (cylinder_times_heads >= (heads * 1024)) { |
988 | sectors_per_track = 63; | |
989 | heads = 16; | |
bef4a34a HJ |
990 | |
991 | cylinder_times_heads = total_sectors; | |
ff568d3a GKH |
992 | /* |
993 | * sector_div stores the quotient in | |
994 | * cylinder_times_heads | |
995 | */ | |
996 | rem = sector_div(cylinder_times_heads, | |
997 | sectors_per_track); | |
998 | } | |
999 | } | |
bef4a34a HJ |
1000 | |
1001 | temp = cylinder_times_heads; | |
ff568d3a GKH |
1002 | /* sector_div stores the quotient in temp */ |
1003 | rem = sector_div(temp, heads); | |
bef4a34a HJ |
1004 | cylinders = temp; |
1005 | ||
1006 | info[0] = heads; | |
ff568d3a GKH |
1007 | info[1] = sectors_per_track; |
1008 | info[2] = cylinders; | |
bef4a34a | 1009 | |
ff568d3a GKH |
1010 | DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, |
1011 | sectors_per_track); | |
bef4a34a HJ |
1012 | |
1013 | return 0; | |
1014 | } | |
1015 | ||
bef4a34a HJ |
1016 | static int __init storvsc_init(void) |
1017 | { | |
1018 | int ret; | |
1019 | ||
bef4a34a | 1020 | DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); |
db085777 | 1021 | ret = storvsc_drv_init(); |
bef4a34a HJ |
1022 | return ret; |
1023 | } | |
1024 | ||
1025 | static void __exit storvsc_exit(void) | |
1026 | { | |
bef4a34a | 1027 | storvsc_drv_exit(); |
bef4a34a HJ |
1028 | } |
1029 | ||
ff568d3a | 1030 | MODULE_LICENSE("GPL"); |
26c14cc1 | 1031 | MODULE_VERSION(HV_DRV_VERSION); |
3afc7cc3 | 1032 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
bef4a34a HJ |
1033 | module_init(storvsc_init); |
1034 | module_exit(storvsc_exit); |