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bef4a34a HJ |
1 | /* |
2 | * | |
3 | * Copyright (c) 2009, Microsoft Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
17 | * | |
18 | * Authors: | |
19 | * Haiyang Zhang <haiyangz@microsoft.com> | |
20 | * Hank Janssen <hjanssen@microsoft.com> | |
21 | * | |
22 | */ | |
23 | ||
bef4a34a HJ |
24 | #include <linux/init.h> |
25 | #include <linux/module.h> | |
26 | #include <linux/device.h> | |
27 | #include <linux/blkdev.h> | |
28 | ||
29 | #include <scsi/scsi.h> | |
30 | #include <scsi/scsi_cmnd.h> | |
31 | #include <scsi/scsi_host.h> | |
32 | #include <scsi/scsi_device.h> | |
33 | #include <scsi/scsi_tcq.h> | |
34 | #include <scsi/scsi_eh.h> | |
35 | #include <scsi/scsi_devinfo.h> | |
36 | ||
bef4a34a | 37 | #include <scsi/scsi_dbg.h> |
bef4a34a | 38 | |
97f4ee3d GKH |
39 | #include "include/logging.h" |
40 | #include "include/vmbus.h" | |
bef4a34a | 41 | |
97f4ee3d | 42 | #include "include/StorVscApi.h" |
bef4a34a HJ |
43 | |
44 | // | |
45 | // #defines | |
46 | // | |
47 | ||
48 | // | |
49 | // Data types | |
50 | // | |
51 | struct host_device_context { | |
52 | struct work_struct host_rescan_work; //must be 1st field | |
53 | struct device_context *device_ctx; // point back to our device context | |
bef4a34a | 54 | struct kmem_cache *request_pool; |
bef4a34a HJ |
55 | unsigned int port; |
56 | unsigned char path; | |
57 | unsigned char target; | |
58 | }; | |
59 | ||
60 | struct storvsc_cmd_request { | |
61 | struct list_head entry; | |
62 | struct scsi_cmnd *cmd; | |
63 | ||
64 | unsigned int bounce_sgl_count; | |
65 | struct scatterlist *bounce_sgl; | |
66 | ||
67 | STORVSC_REQUEST request; | |
68 | // !!!DO NOT ADD ANYTHING BELOW HERE!!! | |
69 | // The extension buffer falls right here and is pointed to by request.Extension; | |
70 | }; | |
71 | ||
72 | struct storvsc_driver_context { | |
73 | // !! These must be the first 2 fields !! | |
74 | struct driver_context drv_ctx; | |
75 | STORVSC_DRIVER_OBJECT drv_obj; | |
76 | }; | |
77 | ||
78 | // Static decl | |
79 | static int storvsc_probe(struct device *dev); | |
80 | static int storvsc_queuecommand(struct scsi_cmnd *scmnd, void (*done)(struct scsi_cmnd *)); | |
81 | static int storvsc_device_alloc(struct scsi_device *); | |
82 | static int storvsc_device_configure(struct scsi_device *); | |
83 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd); | |
bef4a34a | 84 | static void storvsc_host_rescan_callback(struct work_struct *work); |
bef4a34a HJ |
85 | static void storvsc_host_rescan(DEVICE_OBJECT* device_obj); |
86 | static int storvsc_remove(struct device *dev); | |
87 | ||
88 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count, unsigned int len); | |
89 | static void destroy_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); | |
90 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); | |
91 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count); | |
92 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count); | |
93 | ||
94 | static int storvsc_report_luns(struct scsi_device *sdev, unsigned int luns[], unsigned int *lun_count); | |
95 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, sector_t capacity, int *info); | |
96 | ||
97 | ||
98 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; | |
99 | ||
100 | // The one and only one | |
101 | static struct storvsc_driver_context g_storvsc_drv; | |
102 | ||
103 | // Scsi driver | |
104 | static struct scsi_host_template scsi_driver = { | |
105 | .module = THIS_MODULE, | |
106 | .name = "storvsc_host_t", | |
107 | .bios_param = storvsc_get_chs, | |
108 | .queuecommand = storvsc_queuecommand, | |
109 | .eh_host_reset_handler = storvsc_host_reset_handler, | |
110 | .slave_alloc = storvsc_device_alloc, | |
111 | .slave_configure = storvsc_device_configure, | |
112 | .cmd_per_lun = 1, | |
113 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, // 64 max_queue * 1 target | |
114 | .this_id = -1, | |
115 | // no use setting to 0 since ll_blk_rw reset it to 1 | |
116 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,// currently 32 | |
117 | // ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge into 1 sg element. If set, we must | |
118 | // limit the max_segment_size to PAGE_SIZE, otherwise we may get 1 sg element that represents multiple | |
119 | // physically contig pfns (ie sg[x].length > PAGE_SIZE). | |
120 | .use_clustering = ENABLE_CLUSTERING, | |
121 | // Make sure we dont get a sg segment crosses a page boundary | |
122 | .dma_boundary = PAGE_SIZE-1, | |
123 | }; | |
124 | ||
125 | ||
126 | /*++ | |
127 | ||
128 | Name: storvsc_drv_init() | |
129 | ||
130 | Desc: StorVsc driver initialization. | |
131 | ||
132 | --*/ | |
133 | int storvsc_drv_init(PFN_DRIVERINITIALIZE pfn_drv_init) | |
134 | { | |
135 | int ret=0; | |
136 | STORVSC_DRIVER_OBJECT *storvsc_drv_obj=&g_storvsc_drv.drv_obj; | |
137 | struct driver_context *drv_ctx=&g_storvsc_drv.drv_ctx; | |
138 | ||
139 | DPRINT_ENTER(STORVSC_DRV); | |
140 | ||
141 | vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface); | |
142 | ||
143 | storvsc_drv_obj->RingBufferSize = storvsc_ringbuffer_size; | |
144 | storvsc_drv_obj->OnHostRescan = storvsc_host_rescan; | |
145 | ||
146 | // Callback to client driver to complete the initialization | |
147 | pfn_drv_init(&storvsc_drv_obj->Base); | |
148 | ||
149 | DPRINT_INFO(STORVSC_DRV, "request extension size %u, max outstanding reqs %u", storvsc_drv_obj->RequestExtSize, storvsc_drv_obj->MaxOutstandingRequestsPerChannel); | |
150 | ||
151 | if (storvsc_drv_obj->MaxOutstandingRequestsPerChannel < STORVSC_MAX_IO_REQUESTS) | |
152 | { | |
153 | DPRINT_ERR(STORVSC_DRV, "The number of outstanding io requests (%d) is larger than that supported (%d) internally.", | |
154 | STORVSC_MAX_IO_REQUESTS, storvsc_drv_obj->MaxOutstandingRequestsPerChannel); | |
155 | return -1; | |
156 | } | |
157 | ||
158 | drv_ctx->driver.name = storvsc_drv_obj->Base.name; | |
159 | memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType, sizeof(GUID)); | |
160 | ||
bef4a34a HJ |
161 | drv_ctx->probe = storvsc_probe; |
162 | drv_ctx->remove = storvsc_remove; | |
bef4a34a HJ |
163 | |
164 | // The driver belongs to vmbus | |
165 | vmbus_child_driver_register(drv_ctx); | |
166 | ||
167 | DPRINT_EXIT(STORVSC_DRV); | |
168 | ||
169 | return ret; | |
170 | } | |
171 | ||
172 | ||
173 | static int storvsc_drv_exit_cb(struct device *dev, void *data) | |
174 | { | |
175 | struct device **curr = (struct device **)data; | |
176 | *curr = dev; | |
177 | return 1; // stop iterating | |
178 | } | |
179 | ||
180 | /*++ | |
181 | ||
182 | Name: storvsc_drv_exit() | |
183 | ||
184 | Desc: | |
185 | ||
186 | --*/ | |
187 | void storvsc_drv_exit(void) | |
188 | { | |
189 | STORVSC_DRIVER_OBJECT *storvsc_drv_obj=&g_storvsc_drv.drv_obj; | |
190 | struct driver_context *drv_ctx=&g_storvsc_drv.drv_ctx; | |
191 | ||
192 | struct device *current_dev=NULL; | |
193 | ||
bef4a34a HJ |
194 | DPRINT_ENTER(STORVSC_DRV); |
195 | ||
196 | while (1) | |
197 | { | |
198 | current_dev = NULL; | |
199 | ||
200 | // Get the device | |
201 | driver_for_each_device(&drv_ctx->driver, NULL, (void*)¤t_dev, storvsc_drv_exit_cb); | |
202 | ||
203 | if (current_dev == NULL) | |
204 | break; | |
205 | ||
206 | // Initiate removal from the top-down | |
207 | device_unregister(current_dev); | |
208 | } | |
209 | ||
210 | if (storvsc_drv_obj->Base.OnCleanup) | |
211 | storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base); | |
212 | ||
213 | vmbus_child_driver_unregister(drv_ctx); | |
214 | ||
215 | DPRINT_EXIT(STORVSC_DRV); | |
216 | ||
217 | return; | |
218 | } | |
219 | ||
220 | /*++ | |
221 | ||
222 | Name: storvsc_probe() | |
223 | ||
224 | Desc: Add a new device for this driver | |
225 | ||
226 | --*/ | |
227 | static int storvsc_probe(struct device *device) | |
228 | { | |
229 | int ret=0; | |
230 | ||
231 | struct driver_context *driver_ctx = driver_to_driver_context(device->driver); | |
232 | struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; | |
233 | STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; | |
234 | ||
235 | struct device_context *device_ctx = device_to_device_context(device); | |
236 | DEVICE_OBJECT* device_obj = &device_ctx->device_obj; | |
237 | ||
238 | struct Scsi_Host *host; | |
239 | struct host_device_context *host_device_ctx; | |
240 | STORVSC_DEVICE_INFO device_info; | |
241 | ||
242 | DPRINT_ENTER(STORVSC_DRV); | |
243 | ||
244 | if (!storvsc_drv_obj->Base.OnDeviceAdd) | |
245 | return -1; | |
246 | ||
247 | host = scsi_host_alloc(&scsi_driver, sizeof(struct host_device_context)); | |
248 | if (!host) | |
249 | { | |
250 | DPRINT_ERR(STORVSC_DRV, "unable to allocate scsi host object"); | |
251 | return -ENOMEM; | |
252 | } | |
253 | ||
0883c52b | 254 | dev_set_drvdata(device, host); |
bef4a34a HJ |
255 | |
256 | host_device_ctx = (struct host_device_context*)host->hostdata; | |
257 | memset(host_device_ctx, 0, sizeof(struct host_device_context)); | |
258 | ||
259 | host_device_ctx->port = host->host_no; | |
260 | host_device_ctx->device_ctx = device_ctx; | |
261 | ||
bef4a34a | 262 | INIT_WORK(&host_device_ctx->host_rescan_work, storvsc_host_rescan_callback); |
bef4a34a | 263 | |
bef4a34a HJ |
264 | host_device_ctx->request_pool = |
265 | kmem_cache_create | |
97f4ee3d | 266 | (dev_name(&device_ctx->device), |
bef4a34a HJ |
267 | sizeof(struct storvsc_cmd_request) + storvsc_drv_obj->RequestExtSize, |
268 | 0, | |
269 | SLAB_HWCACHE_ALIGN, NULL); | |
bef4a34a HJ |
270 | |
271 | if (!host_device_ctx->request_pool) | |
272 | { | |
273 | scsi_host_put(host); | |
274 | DPRINT_EXIT(STORVSC_DRV); | |
275 | ||
276 | return -ENOMEM; | |
277 | } | |
278 | ||
279 | device_info.PortNumber = host->host_no; | |
280 | // Call to the vsc driver to add the device | |
281 | ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, (void*)&device_info); | |
282 | if (ret != 0) | |
283 | { | |
284 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi vsc device"); | |
285 | kmem_cache_destroy(host_device_ctx->request_pool); | |
286 | scsi_host_put(host); | |
287 | DPRINT_EXIT(STORVSC_DRV); | |
288 | ||
289 | return -1; | |
290 | } | |
291 | ||
292 | //host_device_ctx->port = device_info.PortNumber; | |
293 | host_device_ctx->path = device_info.PathId; | |
294 | host_device_ctx->target = device_info.TargetId; | |
295 | ||
296 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; // max # of devices per target | |
297 | host->max_id = STORVSC_MAX_TARGETS; // max # of targets per channel | |
298 | host->max_channel = STORVSC_MAX_CHANNELS -1; // max # of channels | |
299 | ||
300 | // Register the HBA and start the scsi bus scan | |
301 | ret = scsi_add_host(host, device); | |
302 | if (ret != 0) | |
303 | { | |
304 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi host device"); | |
305 | ||
306 | storvsc_drv_obj->Base.OnDeviceRemove(device_obj); | |
307 | ||
308 | kmem_cache_destroy(host_device_ctx->request_pool); | |
309 | scsi_host_put(host); | |
310 | DPRINT_EXIT(STORVSC_DRV); | |
311 | ||
312 | return -1; | |
313 | } | |
314 | ||
315 | scsi_scan_host(host); | |
316 | ||
317 | DPRINT_EXIT(STORVSC_DRV); | |
318 | ||
319 | return ret; | |
320 | } | |
321 | ||
322 | ||
323 | /*++ | |
324 | ||
325 | Name: storvsc_remove() | |
326 | ||
327 | Desc: Callback when our device is removed | |
328 | ||
329 | --*/ | |
330 | static int storvsc_remove(struct device *device) | |
331 | { | |
332 | int ret=0; | |
333 | ||
334 | struct driver_context *driver_ctx = driver_to_driver_context(device->driver); | |
335 | struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; | |
336 | STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; | |
337 | ||
338 | struct device_context *device_ctx = device_to_device_context(device); | |
339 | DEVICE_OBJECT* device_obj = &device_ctx->device_obj; | |
340 | ||
0883c52b | 341 | struct Scsi_Host *host = dev_get_drvdata(device); |
bef4a34a HJ |
342 | struct host_device_context *host_device_ctx=(struct host_device_context*)host->hostdata; |
343 | ||
344 | ||
345 | DPRINT_ENTER(STORVSC_DRV); | |
346 | ||
347 | if (!storvsc_drv_obj->Base.OnDeviceRemove) | |
348 | { | |
349 | DPRINT_EXIT(STORVSC_DRV); | |
350 | return -1; | |
351 | } | |
352 | ||
353 | // Call to the vsc driver to let it know that the device is being removed | |
354 | ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj); | |
355 | if (ret != 0) | |
356 | { | |
357 | // TODO: | |
358 | DPRINT_ERR(STORVSC, "unable to remove vsc device (ret %d)", ret); | |
359 | } | |
360 | ||
361 | if (host_device_ctx->request_pool) | |
362 | { | |
363 | kmem_cache_destroy(host_device_ctx->request_pool); | |
364 | host_device_ctx->request_pool = NULL; | |
365 | } | |
366 | ||
367 | DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); | |
368 | scsi_remove_host(host); | |
369 | ||
370 | DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); | |
371 | scsi_host_put(host); | |
372 | ||
373 | DPRINT_EXIT(STORVSC_DRV); | |
374 | ||
375 | return ret; | |
376 | } | |
377 | ||
378 | /*++ | |
379 | ||
380 | Name: storvsc_commmand_completion() | |
381 | ||
382 | Desc: Command completion processing | |
383 | ||
384 | --*/ | |
385 | static void storvsc_commmand_completion(STORVSC_REQUEST* request) | |
386 | { | |
387 | struct storvsc_cmd_request *cmd_request = (struct storvsc_cmd_request*)request->Context; | |
388 | struct scsi_cmnd *scmnd = cmd_request->cmd; | |
389 | struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata; | |
390 | void (*scsi_done_fn)(struct scsi_cmnd *); | |
bef4a34a | 391 | struct scsi_sense_hdr sense_hdr; |
bef4a34a HJ |
392 | |
393 | ASSERT(request == &cmd_request->request); | |
394 | ASSERT((unsigned long)scmnd->host_scribble == (unsigned long)cmd_request); | |
395 | ASSERT(scmnd); | |
396 | ASSERT(scmnd->scsi_done); | |
397 | ||
398 | DPRINT_ENTER(STORVSC_DRV); | |
399 | ||
400 | if (cmd_request->bounce_sgl_count)// using bounce buffer | |
401 | { | |
402 | //printk("copy_from_bounce_buffer\n"); | |
403 | ||
404 | // FIXME: We can optimize on writes by just skipping this | |
bef4a34a | 405 | copy_from_bounce_buffer(scsi_sglist(scmnd), cmd_request->bounce_sgl, scsi_sg_count(scmnd)); |
bef4a34a HJ |
406 | destroy_bounce_buffer(cmd_request->bounce_sgl, cmd_request->bounce_sgl_count); |
407 | } | |
408 | ||
409 | scmnd->result = request->Status; | |
410 | ||
411 | if (scmnd->result) | |
412 | { | |
bef4a34a HJ |
413 | if (scsi_normalize_sense(scmnd->sense_buffer, request->SenseBufferSize, &sense_hdr)) |
414 | { | |
415 | scsi_print_sense_hdr("storvsc", &sense_hdr); | |
416 | } | |
bef4a34a HJ |
417 | } |
418 | ||
419 | ASSERT(request->BytesXfer <= request->DataBuffer.Length); | |
bef4a34a | 420 | scsi_set_resid(scmnd, request->DataBuffer.Length - request->BytesXfer); |
bef4a34a HJ |
421 | |
422 | scsi_done_fn = scmnd->scsi_done; | |
423 | ||
424 | scmnd->host_scribble = NULL; | |
425 | scmnd->scsi_done = NULL; | |
426 | ||
427 | // !!DO NOT MODIFY the scmnd after this call | |
428 | scsi_done_fn(scmnd); | |
429 | ||
430 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); | |
431 | ||
432 | DPRINT_EXIT(STORVSC_DRV); | |
433 | } | |
434 | ||
435 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
436 | { | |
437 | int i=0; | |
438 | ||
439 | // No need to check | |
440 | if (sg_count < 2) | |
441 | return -1; | |
442 | ||
443 | // We have at least 2 sg entries | |
444 | for ( i=0; i<sg_count; i++ ) | |
445 | { | |
446 | if (i == 0) // make sure 1st one does not have hole | |
447 | { | |
448 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) | |
449 | return i; | |
450 | } | |
451 | else if (i == sg_count - 1) // make sure last one does not have hole | |
452 | { | |
453 | if (sgl[i].offset != 0) | |
454 | return i; | |
455 | } | |
456 | else // make sure no hole in the middle | |
457 | { | |
458 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) | |
459 | { | |
460 | return i; | |
461 | } | |
462 | } | |
463 | } | |
464 | return -1; | |
465 | } | |
466 | ||
467 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count, unsigned int len) | |
468 | { | |
469 | int i; | |
470 | int num_pages=0; | |
471 | struct scatterlist* bounce_sgl; | |
472 | struct page *page_buf; | |
473 | ||
474 | num_pages = ALIGN_UP(len, PAGE_SIZE) >> PAGE_SHIFT; | |
475 | ||
06da0bc8 | 476 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); |
bef4a34a HJ |
477 | if (!bounce_sgl) |
478 | { | |
479 | return NULL; | |
480 | } | |
481 | ||
482 | for(i=0; i<num_pages; i++) | |
483 | { | |
484 | page_buf = alloc_page(GFP_ATOMIC); | |
485 | if (!page_buf) | |
486 | { | |
487 | goto cleanup; | |
488 | } | |
bef4a34a | 489 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); |
bef4a34a HJ |
490 | } |
491 | ||
492 | return bounce_sgl; | |
493 | ||
494 | cleanup: | |
495 | destroy_bounce_buffer(bounce_sgl, num_pages); | |
496 | return NULL; | |
497 | } | |
498 | ||
499 | static void destroy_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) | |
500 | { | |
501 | int i; | |
502 | struct page *page_buf; | |
503 | ||
504 | for (i=0; i<sg_count; i++) | |
505 | { | |
bef4a34a | 506 | if ((page_buf = sg_page((&sgl[i]))) != NULL) |
bef4a34a HJ |
507 | |
508 | { | |
509 | __free_page(page_buf); | |
510 | } | |
511 | } | |
512 | ||
513 | kfree(sgl); | |
514 | } | |
515 | ||
516 | // Assume the bounce_sgl has enough room ie using the create_bounce_buffer() | |
517 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count) | |
518 | { | |
519 | int i=0,j=0; | |
520 | unsigned long src, dest; | |
521 | unsigned int srclen, destlen, copylen; | |
522 | unsigned int total_copied=0; | |
523 | unsigned long bounce_addr=0; | |
524 | unsigned long src_addr=0; | |
525 | unsigned long flags; | |
526 | ||
527 | local_irq_save(flags); | |
528 | ||
529 | for (i=0; i<orig_sgl_count; i++) | |
530 | { | |
bef4a34a | 531 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), KM_IRQ0) + orig_sgl[i].offset; |
bef4a34a HJ |
532 | src = src_addr; |
533 | srclen = orig_sgl[i].length; | |
534 | ||
535 | //if (PageHighMem(orig_sgl[i].page)) | |
536 | // printk("HighMem page detected - addr %p", (void*)src); | |
537 | ||
538 | ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); | |
539 | ||
540 | if (j == 0) | |
541 | { | |
bef4a34a | 542 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a HJ |
543 | } |
544 | ||
545 | while (srclen) | |
546 | { | |
547 | // assume bounce offset always == 0 | |
548 | dest = bounce_addr + bounce_sgl[j].length; | |
549 | destlen = PAGE_SIZE - bounce_sgl[j].length; | |
550 | ||
fc6a4b26 | 551 | copylen = min(srclen, destlen); |
bef4a34a HJ |
552 | memcpy((void*)dest, (void*)src, copylen); |
553 | ||
554 | total_copied += copylen; | |
555 | bounce_sgl[j].length += copylen; | |
556 | srclen -= copylen; | |
557 | src += copylen; | |
558 | ||
559 | if (bounce_sgl[j].length == PAGE_SIZE) // full..move to next entry | |
560 | { | |
561 | kunmap_atomic((void*)bounce_addr, KM_IRQ0); | |
562 | j++; | |
563 | ||
564 | // if we need to use another bounce buffer | |
565 | if (srclen || i != orig_sgl_count -1) | |
566 | { | |
bef4a34a | 567 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a HJ |
568 | } |
569 | } | |
570 | else if (srclen == 0 && i == orig_sgl_count -1) // // unmap the last bounce that is < PAGE_SIZE | |
571 | { | |
572 | kunmap_atomic((void*)bounce_addr, KM_IRQ0); | |
573 | } | |
574 | } | |
575 | ||
576 | kunmap_atomic((void*)(src_addr - orig_sgl[i].offset), KM_IRQ0); | |
577 | } | |
578 | ||
579 | local_irq_restore(flags); | |
580 | ||
581 | return total_copied; | |
582 | } | |
583 | ||
584 | // Assume the original sgl has enough room | |
585 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count) | |
586 | { | |
587 | int i=0,j=0; | |
588 | unsigned long src, dest; | |
589 | unsigned int srclen, destlen, copylen; | |
590 | unsigned int total_copied=0; | |
591 | unsigned long bounce_addr=0; | |
592 | unsigned long dest_addr=0; | |
593 | unsigned long flags; | |
594 | ||
595 | local_irq_save(flags); | |
596 | ||
597 | for (i=0; i<orig_sgl_count; i++) | |
598 | { | |
bef4a34a | 599 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), KM_IRQ0) + orig_sgl[i].offset; |
bef4a34a HJ |
600 | dest = dest_addr; |
601 | destlen = orig_sgl[i].length; | |
602 | ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); | |
603 | ||
604 | if (j == 0) | |
605 | { | |
bef4a34a | 606 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a HJ |
607 | } |
608 | ||
609 | while (destlen) | |
610 | { | |
611 | src = bounce_addr + bounce_sgl[j].offset; | |
612 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; | |
613 | ||
fc6a4b26 | 614 | copylen = min(srclen, destlen); |
bef4a34a HJ |
615 | memcpy((void*)dest, (void*)src, copylen); |
616 | ||
617 | total_copied += copylen; | |
618 | bounce_sgl[j].offset += copylen; | |
619 | destlen -= copylen; | |
620 | dest += copylen; | |
621 | ||
622 | if (bounce_sgl[j].offset == bounce_sgl[j].length) // full | |
623 | { | |
624 | kunmap_atomic((void*)bounce_addr, KM_IRQ0); | |
625 | j++; | |
626 | ||
627 | // if we need to use another bounce buffer | |
628 | if (destlen || i != orig_sgl_count -1) | |
629 | { | |
bef4a34a | 630 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
bef4a34a HJ |
631 | } |
632 | } | |
633 | else if (destlen == 0 && i == orig_sgl_count -1) // unmap the last bounce that is < PAGE_SIZE | |
634 | { | |
635 | kunmap_atomic((void*)bounce_addr, KM_IRQ0); | |
636 | } | |
637 | } | |
638 | ||
639 | kunmap_atomic((void*)(dest_addr - orig_sgl[i].offset), KM_IRQ0); | |
640 | } | |
641 | ||
642 | local_irq_restore(flags); | |
643 | ||
644 | return total_copied; | |
645 | } | |
646 | ||
647 | ||
648 | /*++ | |
649 | ||
650 | Name: storvsc_queuecommand() | |
651 | ||
652 | Desc: Initiate command processing | |
653 | ||
654 | --*/ | |
655 | static int storvsc_queuecommand(struct scsi_cmnd *scmnd, void (*done)(struct scsi_cmnd *)) | |
656 | { | |
657 | int ret=0; | |
658 | struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata; | |
659 | struct device_context *device_ctx=host_device_ctx->device_ctx; | |
660 | struct driver_context *driver_ctx = driver_to_driver_context(device_ctx->device.driver); | |
661 | struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; | |
662 | STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; | |
663 | ||
664 | STORVSC_REQUEST *request; | |
665 | struct storvsc_cmd_request *cmd_request; | |
666 | unsigned int request_size=0; | |
667 | int i; | |
668 | struct scatterlist *sgl; | |
669 | ||
670 | DPRINT_ENTER(STORVSC_DRV); | |
671 | ||
bef4a34a HJ |
672 | DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d queue depth %d tagged %d", |
673 | scmnd, | |
674 | scmnd->sc_data_direction, | |
675 | scsi_sg_count(scmnd), | |
676 | scsi_sglist(scmnd), | |
677 | scsi_bufflen(scmnd), | |
678 | scmnd->device->queue_depth, | |
679 | scmnd->device->tagged_supported); | |
bef4a34a HJ |
680 | |
681 | // If retrying, no need to prep the cmd | |
682 | if (scmnd->host_scribble) | |
683 | { | |
684 | ASSERT(scmnd->scsi_done != NULL); | |
685 | ||
686 | cmd_request = (struct storvsc_cmd_request* )scmnd->host_scribble; | |
687 | DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", scmnd, cmd_request); | |
688 | ||
689 | goto retry_request; | |
690 | } | |
691 | ||
692 | ASSERT(scmnd->scsi_done == NULL); | |
693 | ASSERT(scmnd->host_scribble == NULL); | |
694 | ||
695 | scmnd->scsi_done = done; | |
696 | ||
697 | request_size = sizeof(struct storvsc_cmd_request); | |
698 | ||
699 | cmd_request = kmem_cache_alloc(host_device_ctx->request_pool, GFP_ATOMIC); | |
700 | if (!cmd_request) | |
701 | { | |
702 | DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - unable to allocate storvsc_cmd_request...marking queue busy", scmnd); | |
703 | ||
704 | scmnd->scsi_done = NULL; | |
705 | return SCSI_MLQUEUE_DEVICE_BUSY; | |
706 | } | |
707 | ||
708 | // Setup the cmd request | |
709 | cmd_request->bounce_sgl_count = 0; | |
710 | cmd_request->bounce_sgl = NULL; | |
711 | cmd_request->cmd = scmnd; | |
712 | ||
713 | scmnd->host_scribble = (unsigned char*)cmd_request; | |
714 | ||
715 | request = &cmd_request->request; | |
716 | ||
717 | request->Extension = (void*)((unsigned long)cmd_request + request_size); | |
718 | DPRINT_DBG(STORVSC_DRV, "req %p size %d ext %d", request, request_size, storvsc_drv_obj->RequestExtSize); | |
719 | ||
720 | // Build the SRB | |
721 | switch(scmnd->sc_data_direction) | |
722 | { | |
723 | case DMA_TO_DEVICE: | |
724 | request->Type = WRITE_TYPE; | |
725 | break; | |
726 | case DMA_FROM_DEVICE: | |
727 | request->Type = READ_TYPE; | |
728 | break; | |
729 | default: | |
730 | request->Type = UNKNOWN_TYPE; | |
731 | break; | |
732 | } | |
733 | ||
734 | request->OnIOCompletion = storvsc_commmand_completion; | |
735 | request->Context = cmd_request;//scmnd; | |
736 | ||
737 | //request->PortId = scmnd->device->channel; | |
738 | request->Host = host_device_ctx->port; | |
739 | request->Bus = scmnd->device->channel; | |
740 | request->TargetId = scmnd->device->id; | |
741 | request->LunId = scmnd->device->lun; | |
742 | ||
743 | ASSERT(scmnd->cmd_len <= 16); | |
744 | request->CdbLen = scmnd->cmd_len; | |
745 | request->Cdb = scmnd->cmnd; | |
746 | ||
747 | request->SenseBuffer = scmnd->sense_buffer; | |
748 | request->SenseBufferSize = SCSI_SENSE_BUFFERSIZE; | |
749 | ||
750 | ||
bef4a34a HJ |
751 | request->DataBuffer.Length = scsi_bufflen(scmnd); |
752 | if (scsi_sg_count(scmnd)) | |
bef4a34a | 753 | { |
bef4a34a | 754 | sgl = (struct scatterlist*)scsi_sglist(scmnd); |
bef4a34a HJ |
755 | |
756 | // check if we need to bounce the sgl | |
bef4a34a | 757 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) |
bef4a34a HJ |
758 | { |
759 | DPRINT_INFO(STORVSC_DRV, "need to bounce buffer for this scmnd %p", scmnd); | |
bef4a34a | 760 | cmd_request->bounce_sgl = create_bounce_buffer(sgl, scsi_sg_count(scmnd), scsi_bufflen(scmnd)); |
bef4a34a HJ |
761 | if (!cmd_request->bounce_sgl) |
762 | { | |
763 | DPRINT_ERR(STORVSC_DRV, "unable to create bounce buffer for this scmnd %p", scmnd); | |
764 | ||
765 | scmnd->scsi_done = NULL; | |
766 | scmnd->host_scribble = NULL; | |
767 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); | |
768 | ||
769 | return SCSI_MLQUEUE_HOST_BUSY; | |
770 | } | |
771 | ||
bef4a34a | 772 | cmd_request->bounce_sgl_count = ALIGN_UP(scsi_bufflen(scmnd), PAGE_SIZE) >> PAGE_SHIFT; |
bef4a34a HJ |
773 | |
774 | //printk("bouncing buffer allocated %p original buffer %p\n", bounce_sgl, sgl); | |
775 | //printk("copy_to_bounce_buffer\n"); | |
776 | // FIXME: We can optimize on reads by just skipping this | |
bef4a34a | 777 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, scsi_sg_count(scmnd)); |
bef4a34a HJ |
778 | |
779 | sgl = cmd_request->bounce_sgl; | |
780 | } | |
781 | ||
782 | request->DataBuffer.Offset = sgl[0].offset; | |
783 | ||
bef4a34a | 784 | for (i = 0; i < scsi_sg_count(scmnd); i++ ) |
bef4a34a HJ |
785 | { |
786 | DPRINT_DBG(STORVSC_DRV, "sgl[%d] len %d offset %d \n", i, sgl[i].length, sgl[i].offset); | |
bef4a34a | 787 | request->DataBuffer.PfnArray[i] = page_to_pfn(sg_page((&sgl[i]))); |
bef4a34a HJ |
788 | } |
789 | } | |
790 | ||
bef4a34a HJ |
791 | else if (scsi_sglist(scmnd)) |
792 | { | |
793 | ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); | |
794 | request->DataBuffer.Offset = virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); | |
795 | request->DataBuffer.PfnArray[0] = virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; | |
796 | } | |
797 | else | |
798 | { | |
799 | ASSERT(scsi_bufflen(scmnd) == 0); | |
800 | } | |
bef4a34a HJ |
801 | |
802 | retry_request: | |
803 | ||
804 | // Invokes the vsc to start an IO | |
805 | ret = storvsc_drv_obj->OnIORequest(&device_ctx->device_obj, &cmd_request->request); | |
806 | if (ret == -1) // no more space | |
807 | { | |
808 | DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - queue FULL...marking queue busy", scmnd); | |
809 | ||
810 | if (cmd_request->bounce_sgl_count) | |
811 | { | |
812 | // FIXME: We can optimize on writes by just skipping this | |
bef4a34a | 813 | copy_from_bounce_buffer(scsi_sglist(scmnd), cmd_request->bounce_sgl, scsi_sg_count(scmnd)); |
bef4a34a HJ |
814 | destroy_bounce_buffer(cmd_request->bounce_sgl, cmd_request->bounce_sgl_count); |
815 | } | |
816 | ||
817 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); | |
818 | ||
819 | scmnd->scsi_done = NULL; | |
820 | scmnd->host_scribble = NULL; | |
821 | ||
822 | ret = SCSI_MLQUEUE_DEVICE_BUSY; | |
823 | } | |
824 | ||
825 | DPRINT_EXIT(STORVSC_DRV); | |
826 | ||
827 | return ret; | |
828 | } | |
829 | ||
bef4a34a HJ |
830 | static int storvsc_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, struct bio_vec *bvec) |
831 | { | |
832 | return bvec->bv_len; //checking done by caller. | |
833 | } | |
bef4a34a HJ |
834 | |
835 | /*++ | |
836 | ||
837 | Name: storvsc_device_configure() | |
838 | ||
839 | Desc: Configure the specified scsi device | |
840 | ||
841 | --*/ | |
842 | static int storvsc_device_alloc(struct scsi_device *sdevice) | |
843 | { | |
bef4a34a HJ |
844 | DPRINT_DBG(STORVSC_DRV, "sdev (%p) - setting device flag to %d", sdevice, BLIST_SPARSELUN); |
845 | // This enables luns to be located sparsely. Otherwise, we may not discovered them. | |
846 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; | |
bef4a34a HJ |
847 | return 0; |
848 | } | |
849 | ||
850 | static int storvsc_device_configure(struct scsi_device *sdevice) | |
851 | { | |
852 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - curr queue depth %d", sdevice, sdevice->queue_depth); | |
853 | ||
854 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting queue depth to %d", sdevice, STORVSC_MAX_IO_REQUESTS); | |
855 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, STORVSC_MAX_IO_REQUESTS); | |
856 | ||
2701f686 | 857 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld", sdevice, PAGE_SIZE); |
bef4a34a HJ |
858 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
859 | ||
860 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", sdevice); | |
861 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); | |
862 | ||
863 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); | |
864 | //sdevice->timeout = (2000 * HZ);//(75 * HZ); | |
865 | ||
866 | return 0; | |
867 | } | |
868 | ||
869 | /*++ | |
870 | ||
871 | Name: storvsc_host_reset_handler() | |
872 | ||
873 | Desc: Reset the scsi HBA | |
874 | ||
875 | --*/ | |
876 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) | |
877 | { | |
878 | int ret=SUCCESS; | |
879 | struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata; | |
880 | struct device_context *device_ctx = host_device_ctx->device_ctx; | |
881 | struct driver_context *driver_ctx = driver_to_driver_context(device_ctx->device.driver); | |
882 | struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; | |
883 | ||
884 | STORVSC_DRIVER_OBJECT *storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; | |
885 | ||
886 | DPRINT_ENTER(STORVSC_DRV); | |
887 | ||
888 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", scmnd->device, &device_ctx->device_obj); | |
889 | ||
890 | // Invokes the vsc to reset the host/bus | |
891 | ASSERT(storvsc_drv_obj->OnHostReset); | |
892 | ret = storvsc_drv_obj->OnHostReset(&device_ctx->device_obj); | |
893 | if (ret != 0) | |
894 | { | |
895 | DPRINT_EXIT(STORVSC_DRV); | |
896 | return ret; | |
897 | } | |
898 | ||
899 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", scmnd->device, &device_ctx->device_obj); | |
900 | ||
901 | DPRINT_EXIT(STORVSC_DRV); | |
902 | ||
903 | return ret; | |
904 | } | |
905 | ||
906 | /*++ | |
907 | ||
908 | Name: storvsc_host_rescan | |
909 | ||
910 | Desc: Rescan the scsi HBA | |
911 | ||
912 | --*/ | |
bef4a34a HJ |
913 | static void storvsc_host_rescan_callback(struct work_struct *work) |
914 | { | |
915 | DEVICE_OBJECT* device_obj = | |
916 | &((struct host_device_context*)work)->device_ctx->device_obj; | |
bef4a34a | 917 | struct device_context* device_ctx = to_device_context(device_obj); |
0883c52b | 918 | struct Scsi_Host *host = dev_get_drvdata(&device_ctx->device); |
bef4a34a HJ |
919 | struct scsi_device *sdev; |
920 | struct host_device_context *host_device_ctx; | |
921 | struct scsi_device **sdevs_remove_list; | |
922 | unsigned int sdevs_count=0; | |
923 | unsigned int found; | |
924 | unsigned int i; | |
925 | unsigned int lun_count=0; | |
926 | unsigned int *lun_list; | |
927 | ||
928 | DPRINT_ENTER(STORVSC_DRV); | |
929 | ||
930 | host_device_ctx = (struct host_device_context*)host->hostdata; | |
06da0bc8 | 931 | lun_list = kcalloc(STORVSC_MAX_LUNS_PER_TARGET, sizeof(unsigned int), GFP_ATOMIC); |
bef4a34a HJ |
932 | if (!lun_list) |
933 | { | |
934 | DPRINT_ERR(STORVSC_DRV, "unable to allocate lun list"); | |
935 | return; | |
936 | } | |
937 | ||
06da0bc8 | 938 | sdevs_remove_list = kcalloc(STORVSC_MAX_LUNS_PER_TARGET, sizeof(void *), GFP_ATOMIC); |
bef4a34a HJ |
939 | if (!sdevs_remove_list) |
940 | { | |
941 | kfree(lun_list); | |
942 | DPRINT_ERR(STORVSC_DRV, "unable to allocate lun remove list"); | |
943 | return; | |
944 | } | |
945 | ||
946 | DPRINT_INFO(STORVSC_DRV, "rescanning host for new scsi devices...", device_obj, host_device_ctx->target, host_device_ctx->path); | |
947 | ||
948 | // Rescan for new device | |
949 | scsi_scan_target(&host->shost_gendev, host_device_ctx->path, host_device_ctx->target, SCAN_WILD_CARD, 1); | |
950 | ||
951 | DPRINT_INFO(STORVSC_DRV, "rescanning host for removed scsi device..."); | |
952 | ||
953 | // Use the 1st device to send the report luns cmd | |
954 | shost_for_each_device(sdev, host) | |
955 | { | |
956 | lun_count=STORVSC_MAX_LUNS_PER_TARGET; | |
957 | storvsc_report_luns(sdev, lun_list, &lun_count); | |
958 | ||
959 | DPRINT_INFO(STORVSC_DRV, "report luns on scsi device (%p) found %u luns ", sdev, lun_count); | |
960 | DPRINT_INFO(STORVSC_DRV, "existing luns on scsi device (%p) host (%d)", sdev, host->host_no); | |
961 | ||
962 | scsi_device_put(sdev); | |
963 | break; | |
964 | } | |
965 | ||
966 | for (i=0; i<lun_count; i++) | |
967 | { | |
968 | DPRINT_INFO(STORVSC_DRV, "%d) lun %u", i, lun_list[i]); | |
969 | } | |
970 | ||
971 | // Rescan for devices that may have been removed. | |
972 | // We do not have to worry that new devices may have been added since | |
973 | // this callback is serialized by the workqueue ie add/remove are done here. | |
974 | shost_for_each_device(sdev, host) | |
975 | { | |
976 | // See if this device is still here | |
977 | found = 0; | |
978 | for (i=0; i<lun_count; i++) | |
979 | { | |
980 | if (sdev->lun == lun_list[i]) | |
981 | { | |
982 | found = 1; | |
983 | break; | |
984 | } | |
985 | } | |
986 | if (!found) | |
987 | { | |
988 | DPRINT_INFO(STORVSC_DRV, "lun (%u) does not exists", sdev->lun); | |
989 | sdevs_remove_list[sdevs_count++] = sdev; | |
990 | } | |
991 | } | |
992 | ||
993 | // Now remove the devices | |
994 | for (i=0; i< sdevs_count; i++) | |
995 | { | |
996 | DPRINT_INFO(STORVSC_DRV, "removing scsi device (%p) lun (%u)...", | |
997 | sdevs_remove_list[i], sdevs_remove_list[i]->lun); | |
998 | ||
999 | // make sure it is not removed from underneath us | |
1000 | if (!scsi_device_get(sdevs_remove_list[i])) | |
1001 | { | |
1002 | scsi_remove_device(sdevs_remove_list[i]); | |
1003 | scsi_device_put(sdevs_remove_list[i]); | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | DPRINT_INFO(STORVSC_DRV, "rescan completed on dev obj (%p) target (%u) bus (%u)", device_obj, host_device_ctx->target, host_device_ctx->path); | |
1008 | ||
1009 | kfree(lun_list); | |
1010 | kfree(sdevs_remove_list); | |
1011 | ||
1012 | DPRINT_EXIT(STORVSC_DRV); | |
1013 | } | |
1014 | ||
1015 | static int storvsc_report_luns(struct scsi_device *sdev, unsigned int luns[], unsigned int *lun_count) | |
1016 | { | |
1017 | int i,j; | |
1018 | unsigned int lun=0; | |
1019 | unsigned int num_luns; | |
1020 | int result; | |
1021 | unsigned char *data; | |
bef4a34a | 1022 | struct scsi_sense_hdr sshdr; |
bef4a34a HJ |
1023 | unsigned char cmd[16]={0}; |
1024 | unsigned int report_len = 8*(STORVSC_MAX_LUNS_PER_TARGET+1); // Add 1 to cover the report_lun header | |
1025 | unsigned long long *report_luns; | |
1026 | const unsigned int in_lun_count = *lun_count; | |
1027 | ||
1028 | *lun_count = 0; | |
1029 | ||
1030 | report_luns = kzalloc(report_len, GFP_ATOMIC); | |
1031 | if (!report_luns) | |
1032 | { | |
1033 | return -ENOMEM; | |
1034 | } | |
1035 | ||
1036 | cmd[0] = REPORT_LUNS; | |
1037 | ||
1038 | // cmd length | |
1039 | *(unsigned int*)&cmd[6] = cpu_to_be32(report_len); | |
1040 | ||
97f4ee3d | 1041 | result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, (unsigned char*)report_luns, report_len, &sshdr, 30*HZ, 3, NULL); |
bef4a34a HJ |
1042 | if (result != 0) |
1043 | { | |
1044 | kfree(report_luns); | |
1045 | return -EBUSY; | |
1046 | } | |
1047 | ||
1048 | // get the length from the first four bytes | |
1049 | report_len = be32_to_cpu(*(unsigned int*)&report_luns[0]); | |
1050 | ||
1051 | num_luns = (report_len / sizeof(unsigned long long)); | |
1052 | if (num_luns > in_lun_count) | |
1053 | { | |
1054 | kfree(report_luns); | |
1055 | return -EINVAL; | |
1056 | } | |
1057 | ||
1058 | *lun_count = num_luns; | |
1059 | ||
1060 | DPRINT_DBG(STORVSC_DRV, "report luns on scsi device (%p) found %u luns ", sdev, num_luns); | |
1061 | ||
1062 | // lun id starts at 1 | |
1063 | for (i=1; i< num_luns+1; i++) | |
1064 | { | |
1065 | lun = 0; | |
1066 | data = (unsigned char*)&report_luns[i]; | |
1067 | for (j = 0; j < sizeof(lun); j += 2) | |
1068 | { | |
1069 | lun = lun | (((data[j] << 8) | data[j + 1]) << (j * 8)); | |
1070 | } | |
1071 | ||
1072 | luns[i-1] = lun; | |
1073 | } | |
1074 | ||
1075 | kfree(report_luns); | |
1076 | return 0; | |
1077 | } | |
bef4a34a HJ |
1078 | |
1079 | static void storvsc_host_rescan(DEVICE_OBJECT* device_obj) | |
1080 | { | |
1081 | struct device_context* device_ctx = to_device_context(device_obj); | |
0883c52b | 1082 | struct Scsi_Host *host = dev_get_drvdata(&device_ctx->device); |
bef4a34a HJ |
1083 | struct host_device_context *host_device_ctx; |
1084 | ||
1085 | DPRINT_ENTER(STORVSC_DRV); | |
bef4a34a HJ |
1086 | |
1087 | host_device_ctx = (struct host_device_context*)host->hostdata; | |
1088 | ||
1089 | DPRINT_INFO(STORVSC_DRV, "initiating rescan on dev obj (%p) target (%u) bus (%u)...", device_obj, host_device_ctx->target, host_device_ctx->path); | |
1090 | ||
1091 | // We need to queue this since the scanning may block and the caller may be in an intr context | |
1092 | //scsi_queue_work(host, &host_device_ctx->host_rescan_work); | |
1093 | schedule_work(&host_device_ctx->host_rescan_work); | |
bef4a34a HJ |
1094 | DPRINT_EXIT(STORVSC_DRV); |
1095 | } | |
1096 | ||
1097 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, sector_t capacity, int *info) | |
1098 | { | |
1099 | sector_t total_sectors = capacity; | |
1100 | sector_t cylinder_times_heads=0; | |
1101 | sector_t temp=0; | |
1102 | ||
1103 | int sectors_per_track=0; | |
1104 | int heads=0; | |
1105 | int cylinders=0; | |
1106 | int rem=0; | |
1107 | ||
1108 | if (total_sectors > (65535 * 16 * 255)) { | |
1109 | total_sectors = (65535 * 16 * 255); | |
1110 | } | |
1111 | ||
1112 | if (total_sectors >= (65535 * 16 * 63)) { | |
1113 | sectors_per_track = 255; | |
1114 | heads = 16; | |
1115 | ||
1116 | cylinder_times_heads = total_sectors; | |
1117 | rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads | |
1118 | } | |
1119 | else | |
1120 | { | |
1121 | sectors_per_track = 17; | |
1122 | ||
1123 | cylinder_times_heads = total_sectors; | |
1124 | rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads | |
1125 | ||
1126 | temp = cylinder_times_heads + 1023; | |
1127 | rem = sector_div(temp, 1024); // sector_div stores the quotient in temp | |
1128 | ||
1129 | heads = temp; | |
1130 | ||
1131 | if (heads < 4) { | |
1132 | heads = 4; | |
1133 | } | |
1134 | ||
1135 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { | |
1136 | sectors_per_track = 31; | |
1137 | heads = 16; | |
1138 | ||
1139 | cylinder_times_heads = total_sectors; | |
1140 | rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads | |
1141 | } | |
1142 | ||
1143 | if (cylinder_times_heads >= (heads * 1024)) { | |
1144 | sectors_per_track = 63; | |
1145 | heads = 16; | |
1146 | ||
1147 | cylinder_times_heads = total_sectors; | |
1148 | rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads | |
1149 | } | |
1150 | } | |
1151 | ||
1152 | temp = cylinder_times_heads; | |
1153 | rem = sector_div(temp, heads); // sector_div stores the quotient in temp | |
1154 | cylinders = temp; | |
1155 | ||
1156 | info[0] = heads; | |
1157 | info[1] = sectors_per_track; | |
1158 | info[2] = cylinders; | |
1159 | ||
1160 | DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, sectors_per_track); | |
1161 | ||
1162 | return 0; | |
1163 | } | |
1164 | ||
1165 | MODULE_LICENSE("GPL"); | |
1166 | ||
1167 | static int __init storvsc_init(void) | |
1168 | { | |
1169 | int ret; | |
1170 | ||
1171 | DPRINT_ENTER(STORVSC_DRV); | |
1172 | ||
1173 | DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); | |
1174 | ||
1175 | ret = storvsc_drv_init(StorVscInitialize); | |
1176 | ||
1177 | DPRINT_EXIT(STORVSC_DRV); | |
1178 | ||
1179 | return ret; | |
1180 | } | |
1181 | ||
1182 | static void __exit storvsc_exit(void) | |
1183 | { | |
1184 | DPRINT_ENTER(STORVSC_DRV); | |
1185 | ||
1186 | storvsc_drv_exit(); | |
1187 | ||
1188 | DPRINT_ENTER(STORVSC_DRV); | |
1189 | } | |
1190 | ||
1191 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); | |
1192 | ||
1193 | module_init(storvsc_init); | |
1194 | module_exit(storvsc_exit); | |
1195 | ||
1196 | // eof |