Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame^] | 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 | |
| 24 | |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/device.h> |
| 28 | #include <linux/blkdev.h> |
| 29 | |
| 30 | #include <scsi/scsi.h> |
| 31 | #include <scsi/scsi_cmnd.h> |
| 32 | #include <scsi/scsi_host.h> |
| 33 | #include <scsi/scsi_device.h> |
| 34 | #include <scsi/scsi_tcq.h> |
| 35 | #include <scsi/scsi_eh.h> |
| 36 | #include <scsi/scsi_devinfo.h> |
| 37 | |
| 38 | #ifdef KERNEL_2_6_5 |
| 39 | #else |
| 40 | #include <scsi/scsi_dbg.h> |
| 41 | #endif |
| 42 | |
| 43 | #include "logging.h" |
| 44 | #include "vmbus.h" |
| 45 | |
| 46 | #include "StorVscApi.h" |
| 47 | |
| 48 | // |
| 49 | // #defines |
| 50 | // |
| 51 | |
| 52 | // |
| 53 | // Data types |
| 54 | // |
| 55 | struct host_device_context { |
| 56 | struct work_struct host_rescan_work; //must be 1st field |
| 57 | struct device_context *device_ctx; // point back to our device context |
| 58 | #ifdef KERNEL_2_6_27 |
| 59 | struct kmem_cache *request_pool; |
| 60 | #else |
| 61 | kmem_cache_t *request_pool; |
| 62 | #endif |
| 63 | unsigned int port; |
| 64 | unsigned char path; |
| 65 | unsigned char target; |
| 66 | }; |
| 67 | |
| 68 | struct storvsc_cmd_request { |
| 69 | struct list_head entry; |
| 70 | struct scsi_cmnd *cmd; |
| 71 | |
| 72 | unsigned int bounce_sgl_count; |
| 73 | struct scatterlist *bounce_sgl; |
| 74 | |
| 75 | STORVSC_REQUEST request; |
| 76 | // !!!DO NOT ADD ANYTHING BELOW HERE!!! |
| 77 | // The extension buffer falls right here and is pointed to by request.Extension; |
| 78 | }; |
| 79 | |
| 80 | struct storvsc_driver_context { |
| 81 | // !! These must be the first 2 fields !! |
| 82 | struct driver_context drv_ctx; |
| 83 | STORVSC_DRIVER_OBJECT drv_obj; |
| 84 | }; |
| 85 | |
| 86 | // Static decl |
| 87 | static int storvsc_probe(struct device *dev); |
| 88 | static int storvsc_queuecommand(struct scsi_cmnd *scmnd, void (*done)(struct scsi_cmnd *)); |
| 89 | static int storvsc_device_alloc(struct scsi_device *); |
| 90 | static int storvsc_device_configure(struct scsi_device *); |
| 91 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd); |
| 92 | #ifdef KERNEL_2_6_27 |
| 93 | static void storvsc_host_rescan_callback(struct work_struct *work); |
| 94 | #else |
| 95 | static void storvsc_host_rescan_callback(void* context); |
| 96 | #endif |
| 97 | static void storvsc_host_rescan(DEVICE_OBJECT* device_obj); |
| 98 | static int storvsc_remove(struct device *dev); |
| 99 | |
| 100 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count, unsigned int len); |
| 101 | static void destroy_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); |
| 102 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); |
| 103 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count); |
| 104 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count); |
| 105 | |
| 106 | static int storvsc_report_luns(struct scsi_device *sdev, unsigned int luns[], unsigned int *lun_count); |
| 107 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, sector_t capacity, int *info); |
| 108 | |
| 109 | |
| 110 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; |
| 111 | |
| 112 | // The one and only one |
| 113 | static struct storvsc_driver_context g_storvsc_drv; |
| 114 | |
| 115 | // Scsi driver |
| 116 | static struct scsi_host_template scsi_driver = { |
| 117 | .module = THIS_MODULE, |
| 118 | .name = "storvsc_host_t", |
| 119 | .bios_param = storvsc_get_chs, |
| 120 | .queuecommand = storvsc_queuecommand, |
| 121 | .eh_host_reset_handler = storvsc_host_reset_handler, |
| 122 | .slave_alloc = storvsc_device_alloc, |
| 123 | .slave_configure = storvsc_device_configure, |
| 124 | .cmd_per_lun = 1, |
| 125 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, // 64 max_queue * 1 target |
| 126 | .this_id = -1, |
| 127 | // no use setting to 0 since ll_blk_rw reset it to 1 |
| 128 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,// currently 32 |
| 129 | // ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge into 1 sg element. If set, we must |
| 130 | // limit the max_segment_size to PAGE_SIZE, otherwise we may get 1 sg element that represents multiple |
| 131 | // physically contig pfns (ie sg[x].length > PAGE_SIZE). |
| 132 | .use_clustering = ENABLE_CLUSTERING, |
| 133 | // Make sure we dont get a sg segment crosses a page boundary |
| 134 | .dma_boundary = PAGE_SIZE-1, |
| 135 | }; |
| 136 | |
| 137 | |
| 138 | /*++ |
| 139 | |
| 140 | Name: storvsc_drv_init() |
| 141 | |
| 142 | Desc: StorVsc driver initialization. |
| 143 | |
| 144 | --*/ |
| 145 | int storvsc_drv_init(PFN_DRIVERINITIALIZE pfn_drv_init) |
| 146 | { |
| 147 | int ret=0; |
| 148 | STORVSC_DRIVER_OBJECT *storvsc_drv_obj=&g_storvsc_drv.drv_obj; |
| 149 | struct driver_context *drv_ctx=&g_storvsc_drv.drv_ctx; |
| 150 | |
| 151 | DPRINT_ENTER(STORVSC_DRV); |
| 152 | |
| 153 | vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface); |
| 154 | |
| 155 | storvsc_drv_obj->RingBufferSize = storvsc_ringbuffer_size; |
| 156 | storvsc_drv_obj->OnHostRescan = storvsc_host_rescan; |
| 157 | |
| 158 | // Callback to client driver to complete the initialization |
| 159 | pfn_drv_init(&storvsc_drv_obj->Base); |
| 160 | |
| 161 | DPRINT_INFO(STORVSC_DRV, "request extension size %u, max outstanding reqs %u", storvsc_drv_obj->RequestExtSize, storvsc_drv_obj->MaxOutstandingRequestsPerChannel); |
| 162 | |
| 163 | if (storvsc_drv_obj->MaxOutstandingRequestsPerChannel < STORVSC_MAX_IO_REQUESTS) |
| 164 | { |
| 165 | DPRINT_ERR(STORVSC_DRV, "The number of outstanding io requests (%d) is larger than that supported (%d) internally.", |
| 166 | STORVSC_MAX_IO_REQUESTS, storvsc_drv_obj->MaxOutstandingRequestsPerChannel); |
| 167 | return -1; |
| 168 | } |
| 169 | |
| 170 | drv_ctx->driver.name = storvsc_drv_obj->Base.name; |
| 171 | memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType, sizeof(GUID)); |
| 172 | |
| 173 | #if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) |
| 174 | drv_ctx->driver.probe = storvsc_probe; |
| 175 | drv_ctx->driver.remove = storvsc_remove; |
| 176 | #else |
| 177 | drv_ctx->probe = storvsc_probe; |
| 178 | drv_ctx->remove = storvsc_remove; |
| 179 | #endif |
| 180 | |
| 181 | // The driver belongs to vmbus |
| 182 | vmbus_child_driver_register(drv_ctx); |
| 183 | |
| 184 | DPRINT_EXIT(STORVSC_DRV); |
| 185 | |
| 186 | return ret; |
| 187 | } |
| 188 | |
| 189 | |
| 190 | static int storvsc_drv_exit_cb(struct device *dev, void *data) |
| 191 | { |
| 192 | struct device **curr = (struct device **)data; |
| 193 | *curr = dev; |
| 194 | return 1; // stop iterating |
| 195 | } |
| 196 | |
| 197 | /*++ |
| 198 | |
| 199 | Name: storvsc_drv_exit() |
| 200 | |
| 201 | Desc: |
| 202 | |
| 203 | --*/ |
| 204 | void storvsc_drv_exit(void) |
| 205 | { |
| 206 | STORVSC_DRIVER_OBJECT *storvsc_drv_obj=&g_storvsc_drv.drv_obj; |
| 207 | struct driver_context *drv_ctx=&g_storvsc_drv.drv_ctx; |
| 208 | |
| 209 | struct device *current_dev=NULL; |
| 210 | |
| 211 | #if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) |
| 212 | #define driver_for_each_device(drv, start, data, fn) \ |
| 213 | struct list_head *ptr, *n; \ |
| 214 | list_for_each_safe(ptr, n, &((drv)->devices)) {\ |
| 215 | struct device *curr_dev;\ |
| 216 | curr_dev = list_entry(ptr, struct device, driver_list);\ |
| 217 | fn(curr_dev, data);\ |
| 218 | } |
| 219 | #endif // KERNEL_2_6_9 |
| 220 | |
| 221 | DPRINT_ENTER(STORVSC_DRV); |
| 222 | |
| 223 | while (1) |
| 224 | { |
| 225 | current_dev = NULL; |
| 226 | |
| 227 | // Get the device |
| 228 | driver_for_each_device(&drv_ctx->driver, NULL, (void*)¤t_dev, storvsc_drv_exit_cb); |
| 229 | |
| 230 | if (current_dev == NULL) |
| 231 | break; |
| 232 | |
| 233 | // Initiate removal from the top-down |
| 234 | device_unregister(current_dev); |
| 235 | } |
| 236 | |
| 237 | if (storvsc_drv_obj->Base.OnCleanup) |
| 238 | storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base); |
| 239 | |
| 240 | vmbus_child_driver_unregister(drv_ctx); |
| 241 | |
| 242 | DPRINT_EXIT(STORVSC_DRV); |
| 243 | |
| 244 | return; |
| 245 | } |
| 246 | |
| 247 | /*++ |
| 248 | |
| 249 | Name: storvsc_probe() |
| 250 | |
| 251 | Desc: Add a new device for this driver |
| 252 | |
| 253 | --*/ |
| 254 | static int storvsc_probe(struct device *device) |
| 255 | { |
| 256 | int ret=0; |
| 257 | |
| 258 | struct driver_context *driver_ctx = driver_to_driver_context(device->driver); |
| 259 | struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; |
| 260 | STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; |
| 261 | |
| 262 | struct device_context *device_ctx = device_to_device_context(device); |
| 263 | DEVICE_OBJECT* device_obj = &device_ctx->device_obj; |
| 264 | |
| 265 | struct Scsi_Host *host; |
| 266 | struct host_device_context *host_device_ctx; |
| 267 | STORVSC_DEVICE_INFO device_info; |
| 268 | |
| 269 | DPRINT_ENTER(STORVSC_DRV); |
| 270 | |
| 271 | if (!storvsc_drv_obj->Base.OnDeviceAdd) |
| 272 | return -1; |
| 273 | |
| 274 | host = scsi_host_alloc(&scsi_driver, sizeof(struct host_device_context)); |
| 275 | if (!host) |
| 276 | { |
| 277 | DPRINT_ERR(STORVSC_DRV, "unable to allocate scsi host object"); |
| 278 | return -ENOMEM; |
| 279 | } |
| 280 | |
| 281 | device->driver_data = host; |
| 282 | |
| 283 | host_device_ctx = (struct host_device_context*)host->hostdata; |
| 284 | memset(host_device_ctx, 0, sizeof(struct host_device_context)); |
| 285 | |
| 286 | host_device_ctx->port = host->host_no; |
| 287 | host_device_ctx->device_ctx = device_ctx; |
| 288 | |
| 289 | #if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) |
| 290 | #elif defined(KERNEL_2_6_27) |
| 291 | INIT_WORK(&host_device_ctx->host_rescan_work, storvsc_host_rescan_callback); |
| 292 | #else |
| 293 | INIT_WORK(&host_device_ctx->host_rescan_work, storvsc_host_rescan_callback, device_obj); |
| 294 | #endif |
| 295 | |
| 296 | #if defined(KERNEL_2_6_27) |
| 297 | host_device_ctx->request_pool = |
| 298 | kmem_cache_create |
| 299 | (device_ctx->device.bus_id, |
| 300 | sizeof(struct storvsc_cmd_request) + storvsc_drv_obj->RequestExtSize, |
| 301 | 0, |
| 302 | SLAB_HWCACHE_ALIGN, NULL); |
| 303 | #else |
| 304 | host_device_ctx->request_pool = |
| 305 | kmem_cache_create |
| 306 | (device_ctx->device.bus_id, |
| 307 | sizeof(struct storvsc_cmd_request) + storvsc_drv_obj->RequestExtSize, |
| 308 | 0, |
| 309 | SLAB_HWCACHE_ALIGN, NULL, NULL); |
| 310 | #endif |
| 311 | |
| 312 | if (!host_device_ctx->request_pool) |
| 313 | { |
| 314 | scsi_host_put(host); |
| 315 | DPRINT_EXIT(STORVSC_DRV); |
| 316 | |
| 317 | return -ENOMEM; |
| 318 | } |
| 319 | |
| 320 | device_info.PortNumber = host->host_no; |
| 321 | // Call to the vsc driver to add the device |
| 322 | ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, (void*)&device_info); |
| 323 | if (ret != 0) |
| 324 | { |
| 325 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi vsc device"); |
| 326 | kmem_cache_destroy(host_device_ctx->request_pool); |
| 327 | scsi_host_put(host); |
| 328 | DPRINT_EXIT(STORVSC_DRV); |
| 329 | |
| 330 | return -1; |
| 331 | } |
| 332 | |
| 333 | //host_device_ctx->port = device_info.PortNumber; |
| 334 | host_device_ctx->path = device_info.PathId; |
| 335 | host_device_ctx->target = device_info.TargetId; |
| 336 | |
| 337 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; // max # of devices per target |
| 338 | host->max_id = STORVSC_MAX_TARGETS; // max # of targets per channel |
| 339 | host->max_channel = STORVSC_MAX_CHANNELS -1; // max # of channels |
| 340 | |
| 341 | // Register the HBA and start the scsi bus scan |
| 342 | ret = scsi_add_host(host, device); |
| 343 | if (ret != 0) |
| 344 | { |
| 345 | DPRINT_ERR(STORVSC_DRV, "unable to add scsi host device"); |
| 346 | |
| 347 | storvsc_drv_obj->Base.OnDeviceRemove(device_obj); |
| 348 | |
| 349 | kmem_cache_destroy(host_device_ctx->request_pool); |
| 350 | scsi_host_put(host); |
| 351 | DPRINT_EXIT(STORVSC_DRV); |
| 352 | |
| 353 | return -1; |
| 354 | } |
| 355 | |
| 356 | scsi_scan_host(host); |
| 357 | |
| 358 | DPRINT_EXIT(STORVSC_DRV); |
| 359 | |
| 360 | return ret; |
| 361 | } |
| 362 | |
| 363 | |
| 364 | /*++ |
| 365 | |
| 366 | Name: storvsc_remove() |
| 367 | |
| 368 | Desc: Callback when our device is removed |
| 369 | |
| 370 | --*/ |
| 371 | static int storvsc_remove(struct device *device) |
| 372 | { |
| 373 | int ret=0; |
| 374 | |
| 375 | struct driver_context *driver_ctx = driver_to_driver_context(device->driver); |
| 376 | struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; |
| 377 | STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; |
| 378 | |
| 379 | struct device_context *device_ctx = device_to_device_context(device); |
| 380 | DEVICE_OBJECT* device_obj = &device_ctx->device_obj; |
| 381 | |
| 382 | struct Scsi_Host *host = (struct Scsi_Host *)device->driver_data; |
| 383 | struct host_device_context *host_device_ctx=(struct host_device_context*)host->hostdata; |
| 384 | |
| 385 | |
| 386 | DPRINT_ENTER(STORVSC_DRV); |
| 387 | |
| 388 | if (!storvsc_drv_obj->Base.OnDeviceRemove) |
| 389 | { |
| 390 | DPRINT_EXIT(STORVSC_DRV); |
| 391 | return -1; |
| 392 | } |
| 393 | |
| 394 | // Call to the vsc driver to let it know that the device is being removed |
| 395 | ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj); |
| 396 | if (ret != 0) |
| 397 | { |
| 398 | // TODO: |
| 399 | DPRINT_ERR(STORVSC, "unable to remove vsc device (ret %d)", ret); |
| 400 | } |
| 401 | |
| 402 | if (host_device_ctx->request_pool) |
| 403 | { |
| 404 | kmem_cache_destroy(host_device_ctx->request_pool); |
| 405 | host_device_ctx->request_pool = NULL; |
| 406 | } |
| 407 | |
| 408 | DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); |
| 409 | scsi_remove_host(host); |
| 410 | |
| 411 | DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); |
| 412 | scsi_host_put(host); |
| 413 | |
| 414 | DPRINT_EXIT(STORVSC_DRV); |
| 415 | |
| 416 | return ret; |
| 417 | } |
| 418 | |
| 419 | /*++ |
| 420 | |
| 421 | Name: storvsc_commmand_completion() |
| 422 | |
| 423 | Desc: Command completion processing |
| 424 | |
| 425 | --*/ |
| 426 | static void storvsc_commmand_completion(STORVSC_REQUEST* request) |
| 427 | { |
| 428 | struct storvsc_cmd_request *cmd_request = (struct storvsc_cmd_request*)request->Context; |
| 429 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
| 430 | struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata; |
| 431 | void (*scsi_done_fn)(struct scsi_cmnd *); |
| 432 | #if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) |
| 433 | #else |
| 434 | struct scsi_sense_hdr sense_hdr; |
| 435 | #endif |
| 436 | |
| 437 | ASSERT(request == &cmd_request->request); |
| 438 | ASSERT((unsigned long)scmnd->host_scribble == (unsigned long)cmd_request); |
| 439 | ASSERT(scmnd); |
| 440 | ASSERT(scmnd->scsi_done); |
| 441 | |
| 442 | DPRINT_ENTER(STORVSC_DRV); |
| 443 | |
| 444 | if (cmd_request->bounce_sgl_count)// using bounce buffer |
| 445 | { |
| 446 | //printk("copy_from_bounce_buffer\n"); |
| 447 | |
| 448 | // FIXME: We can optimize on writes by just skipping this |
| 449 | #ifdef KERNEL_2_6_27 |
| 450 | copy_from_bounce_buffer(scsi_sglist(scmnd), cmd_request->bounce_sgl, scsi_sg_count(scmnd)); |
| 451 | #else |
| 452 | copy_from_bounce_buffer(scmnd->request_buffer, cmd_request->bounce_sgl, scmnd->use_sg); |
| 453 | #endif |
| 454 | destroy_bounce_buffer(cmd_request->bounce_sgl, cmd_request->bounce_sgl_count); |
| 455 | } |
| 456 | |
| 457 | scmnd->result = request->Status; |
| 458 | |
| 459 | if (scmnd->result) |
| 460 | { |
| 461 | #if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) |
| 462 | DPRINT_INFO(STORVSC_DRV, "scsi result nonzero - %d", scmnd->result); |
| 463 | #else |
| 464 | if (scsi_normalize_sense(scmnd->sense_buffer, request->SenseBufferSize, &sense_hdr)) |
| 465 | { |
| 466 | scsi_print_sense_hdr("storvsc", &sense_hdr); |
| 467 | } |
| 468 | #endif |
| 469 | } |
| 470 | |
| 471 | ASSERT(request->BytesXfer <= request->DataBuffer.Length); |
| 472 | #ifdef KERNEL_2_6_27 |
| 473 | scsi_set_resid(scmnd, request->DataBuffer.Length - request->BytesXfer); |
| 474 | #else |
| 475 | scmnd->resid = request->DataBuffer.Length - request->BytesXfer; |
| 476 | #endif |
| 477 | |
| 478 | scsi_done_fn = scmnd->scsi_done; |
| 479 | |
| 480 | scmnd->host_scribble = NULL; |
| 481 | scmnd->scsi_done = NULL; |
| 482 | |
| 483 | // !!DO NOT MODIFY the scmnd after this call |
| 484 | scsi_done_fn(scmnd); |
| 485 | |
| 486 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); |
| 487 | |
| 488 | DPRINT_EXIT(STORVSC_DRV); |
| 489 | } |
| 490 | |
| 491 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
| 492 | { |
| 493 | int i=0; |
| 494 | |
| 495 | // No need to check |
| 496 | if (sg_count < 2) |
| 497 | return -1; |
| 498 | |
| 499 | // We have at least 2 sg entries |
| 500 | for ( i=0; i<sg_count; i++ ) |
| 501 | { |
| 502 | if (i == 0) // make sure 1st one does not have hole |
| 503 | { |
| 504 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) |
| 505 | return i; |
| 506 | } |
| 507 | else if (i == sg_count - 1) // make sure last one does not have hole |
| 508 | { |
| 509 | if (sgl[i].offset != 0) |
| 510 | return i; |
| 511 | } |
| 512 | else // make sure no hole in the middle |
| 513 | { |
| 514 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) |
| 515 | { |
| 516 | return i; |
| 517 | } |
| 518 | } |
| 519 | } |
| 520 | return -1; |
| 521 | } |
| 522 | |
| 523 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count, unsigned int len) |
| 524 | { |
| 525 | int i; |
| 526 | int num_pages=0; |
| 527 | struct scatterlist* bounce_sgl; |
| 528 | struct page *page_buf; |
| 529 | |
| 530 | num_pages = ALIGN_UP(len, PAGE_SIZE) >> PAGE_SHIFT; |
| 531 | |
| 532 | bounce_sgl = kzalloc(num_pages * sizeof(struct scatterlist), GFP_ATOMIC); |
| 533 | if (!bounce_sgl) |
| 534 | { |
| 535 | return NULL; |
| 536 | } |
| 537 | |
| 538 | for(i=0; i<num_pages; i++) |
| 539 | { |
| 540 | page_buf = alloc_page(GFP_ATOMIC); |
| 541 | if (!page_buf) |
| 542 | { |
| 543 | goto cleanup; |
| 544 | } |
| 545 | #ifdef KERNEL_2_6_27 |
| 546 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); |
| 547 | #else |
| 548 | bounce_sgl[i].page = page_buf; |
| 549 | bounce_sgl[i].offset = 0; |
| 550 | bounce_sgl[i].length = 0; |
| 551 | #endif |
| 552 | } |
| 553 | |
| 554 | return bounce_sgl; |
| 555 | |
| 556 | cleanup: |
| 557 | destroy_bounce_buffer(bounce_sgl, num_pages); |
| 558 | return NULL; |
| 559 | } |
| 560 | |
| 561 | static void destroy_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
| 562 | { |
| 563 | int i; |
| 564 | struct page *page_buf; |
| 565 | |
| 566 | for (i=0; i<sg_count; i++) |
| 567 | { |
| 568 | #ifdef KERNEL_2_6_27 |
| 569 | if ((page_buf = sg_page((&sgl[i]))) != NULL) |
| 570 | #else |
| 571 | if ((page_buf = sgl[i].page) != NULL) |
| 572 | #endif |
| 573 | |
| 574 | { |
| 575 | __free_page(page_buf); |
| 576 | } |
| 577 | } |
| 578 | |
| 579 | kfree(sgl); |
| 580 | } |
| 581 | |
| 582 | // Assume the bounce_sgl has enough room ie using the create_bounce_buffer() |
| 583 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count) |
| 584 | { |
| 585 | int i=0,j=0; |
| 586 | unsigned long src, dest; |
| 587 | unsigned int srclen, destlen, copylen; |
| 588 | unsigned int total_copied=0; |
| 589 | unsigned long bounce_addr=0; |
| 590 | unsigned long src_addr=0; |
| 591 | unsigned long flags; |
| 592 | |
| 593 | local_irq_save(flags); |
| 594 | |
| 595 | for (i=0; i<orig_sgl_count; i++) |
| 596 | { |
| 597 | #ifdef KERNEL_2_6_27 |
| 598 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), KM_IRQ0) + orig_sgl[i].offset; |
| 599 | #else |
| 600 | src_addr = (unsigned long)kmap_atomic(orig_sgl[i].page, KM_IRQ0) + orig_sgl[i].offset; |
| 601 | #endif |
| 602 | src = src_addr; |
| 603 | srclen = orig_sgl[i].length; |
| 604 | |
| 605 | //if (PageHighMem(orig_sgl[i].page)) |
| 606 | // printk("HighMem page detected - addr %p", (void*)src); |
| 607 | |
| 608 | ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); |
| 609 | |
| 610 | if (j == 0) |
| 611 | { |
| 612 | #ifdef KERNEL_2_6_27 |
| 613 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
| 614 | #else |
| 615 | bounce_addr = (unsigned long)kmap_atomic(bounce_sgl[j].page, KM_IRQ0); |
| 616 | #endif |
| 617 | } |
| 618 | |
| 619 | while (srclen) |
| 620 | { |
| 621 | // assume bounce offset always == 0 |
| 622 | dest = bounce_addr + bounce_sgl[j].length; |
| 623 | destlen = PAGE_SIZE - bounce_sgl[j].length; |
| 624 | |
| 625 | copylen = MIN(srclen, destlen); |
| 626 | memcpy((void*)dest, (void*)src, copylen); |
| 627 | |
| 628 | total_copied += copylen; |
| 629 | bounce_sgl[j].length += copylen; |
| 630 | srclen -= copylen; |
| 631 | src += copylen; |
| 632 | |
| 633 | if (bounce_sgl[j].length == PAGE_SIZE) // full..move to next entry |
| 634 | { |
| 635 | kunmap_atomic((void*)bounce_addr, KM_IRQ0); |
| 636 | j++; |
| 637 | |
| 638 | // if we need to use another bounce buffer |
| 639 | if (srclen || i != orig_sgl_count -1) |
| 640 | { |
| 641 | #ifdef KERNEL_2_6_27 |
| 642 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
| 643 | #else |
| 644 | bounce_addr = (unsigned long)kmap_atomic(bounce_sgl[j].page, KM_IRQ0); |
| 645 | #endif |
| 646 | } |
| 647 | } |
| 648 | else if (srclen == 0 && i == orig_sgl_count -1) // // unmap the last bounce that is < PAGE_SIZE |
| 649 | { |
| 650 | kunmap_atomic((void*)bounce_addr, KM_IRQ0); |
| 651 | } |
| 652 | } |
| 653 | |
| 654 | kunmap_atomic((void*)(src_addr - orig_sgl[i].offset), KM_IRQ0); |
| 655 | } |
| 656 | |
| 657 | local_irq_restore(flags); |
| 658 | |
| 659 | return total_copied; |
| 660 | } |
| 661 | |
| 662 | // Assume the original sgl has enough room |
| 663 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count) |
| 664 | { |
| 665 | int i=0,j=0; |
| 666 | unsigned long src, dest; |
| 667 | unsigned int srclen, destlen, copylen; |
| 668 | unsigned int total_copied=0; |
| 669 | unsigned long bounce_addr=0; |
| 670 | unsigned long dest_addr=0; |
| 671 | unsigned long flags; |
| 672 | |
| 673 | local_irq_save(flags); |
| 674 | |
| 675 | for (i=0; i<orig_sgl_count; i++) |
| 676 | { |
| 677 | #ifdef KERNEL_2_6_27 |
| 678 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), KM_IRQ0) + orig_sgl[i].offset; |
| 679 | #else |
| 680 | dest_addr = (unsigned long)kmap_atomic(orig_sgl[i].page, KM_IRQ0) + orig_sgl[i].offset; |
| 681 | #endif |
| 682 | dest = dest_addr; |
| 683 | destlen = orig_sgl[i].length; |
| 684 | ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); |
| 685 | |
| 686 | if (j == 0) |
| 687 | { |
| 688 | #ifdef KERNEL_2_6_27 |
| 689 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
| 690 | #else |
| 691 | bounce_addr = (unsigned long)kmap_atomic(bounce_sgl[j].page, KM_IRQ0); |
| 692 | #endif |
| 693 | } |
| 694 | |
| 695 | while (destlen) |
| 696 | { |
| 697 | src = bounce_addr + bounce_sgl[j].offset; |
| 698 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; |
| 699 | |
| 700 | copylen = MIN(srclen, destlen); |
| 701 | memcpy((void*)dest, (void*)src, copylen); |
| 702 | |
| 703 | total_copied += copylen; |
| 704 | bounce_sgl[j].offset += copylen; |
| 705 | destlen -= copylen; |
| 706 | dest += copylen; |
| 707 | |
| 708 | if (bounce_sgl[j].offset == bounce_sgl[j].length) // full |
| 709 | { |
| 710 | kunmap_atomic((void*)bounce_addr, KM_IRQ0); |
| 711 | j++; |
| 712 | |
| 713 | // if we need to use another bounce buffer |
| 714 | if (destlen || i != orig_sgl_count -1) |
| 715 | { |
| 716 | #ifdef KERNEL_2_6_27 |
| 717 | bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); |
| 718 | #else |
| 719 | bounce_addr = (unsigned long)kmap_atomic(bounce_sgl[j].page, KM_IRQ0); |
| 720 | #endif |
| 721 | } |
| 722 | } |
| 723 | else if (destlen == 0 && i == orig_sgl_count -1) // unmap the last bounce that is < PAGE_SIZE |
| 724 | { |
| 725 | kunmap_atomic((void*)bounce_addr, KM_IRQ0); |
| 726 | } |
| 727 | } |
| 728 | |
| 729 | kunmap_atomic((void*)(dest_addr - orig_sgl[i].offset), KM_IRQ0); |
| 730 | } |
| 731 | |
| 732 | local_irq_restore(flags); |
| 733 | |
| 734 | return total_copied; |
| 735 | } |
| 736 | |
| 737 | |
| 738 | /*++ |
| 739 | |
| 740 | Name: storvsc_queuecommand() |
| 741 | |
| 742 | Desc: Initiate command processing |
| 743 | |
| 744 | --*/ |
| 745 | static int storvsc_queuecommand(struct scsi_cmnd *scmnd, void (*done)(struct scsi_cmnd *)) |
| 746 | { |
| 747 | int ret=0; |
| 748 | struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata; |
| 749 | struct device_context *device_ctx=host_device_ctx->device_ctx; |
| 750 | struct driver_context *driver_ctx = driver_to_driver_context(device_ctx->device.driver); |
| 751 | struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; |
| 752 | STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; |
| 753 | |
| 754 | STORVSC_REQUEST *request; |
| 755 | struct storvsc_cmd_request *cmd_request; |
| 756 | unsigned int request_size=0; |
| 757 | int i; |
| 758 | struct scatterlist *sgl; |
| 759 | |
| 760 | DPRINT_ENTER(STORVSC_DRV); |
| 761 | |
| 762 | #ifdef KERNEL_2_6_27 |
| 763 | DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d queue depth %d tagged %d", |
| 764 | scmnd, |
| 765 | scmnd->sc_data_direction, |
| 766 | scsi_sg_count(scmnd), |
| 767 | scsi_sglist(scmnd), |
| 768 | scsi_bufflen(scmnd), |
| 769 | scmnd->device->queue_depth, |
| 770 | scmnd->device->tagged_supported); |
| 771 | #else |
| 772 | DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d queue depth %d tagged %d", |
| 773 | scmnd, |
| 774 | scmnd->sc_data_direction, |
| 775 | scmnd->use_sg, |
| 776 | scmnd->request_buffer, |
| 777 | scmnd->request_bufflen, |
| 778 | scmnd->device->queue_depth, |
| 779 | scmnd->device->tagged_supported); |
| 780 | #endif |
| 781 | |
| 782 | // If retrying, no need to prep the cmd |
| 783 | if (scmnd->host_scribble) |
| 784 | { |
| 785 | ASSERT(scmnd->scsi_done != NULL); |
| 786 | |
| 787 | cmd_request = (struct storvsc_cmd_request* )scmnd->host_scribble; |
| 788 | DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", scmnd, cmd_request); |
| 789 | |
| 790 | goto retry_request; |
| 791 | } |
| 792 | |
| 793 | ASSERT(scmnd->scsi_done == NULL); |
| 794 | ASSERT(scmnd->host_scribble == NULL); |
| 795 | |
| 796 | scmnd->scsi_done = done; |
| 797 | |
| 798 | request_size = sizeof(struct storvsc_cmd_request); |
| 799 | |
| 800 | cmd_request = kmem_cache_alloc(host_device_ctx->request_pool, GFP_ATOMIC); |
| 801 | if (!cmd_request) |
| 802 | { |
| 803 | DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - unable to allocate storvsc_cmd_request...marking queue busy", scmnd); |
| 804 | |
| 805 | scmnd->scsi_done = NULL; |
| 806 | return SCSI_MLQUEUE_DEVICE_BUSY; |
| 807 | } |
| 808 | |
| 809 | // Setup the cmd request |
| 810 | cmd_request->bounce_sgl_count = 0; |
| 811 | cmd_request->bounce_sgl = NULL; |
| 812 | cmd_request->cmd = scmnd; |
| 813 | |
| 814 | scmnd->host_scribble = (unsigned char*)cmd_request; |
| 815 | |
| 816 | request = &cmd_request->request; |
| 817 | |
| 818 | request->Extension = (void*)((unsigned long)cmd_request + request_size); |
| 819 | DPRINT_DBG(STORVSC_DRV, "req %p size %d ext %d", request, request_size, storvsc_drv_obj->RequestExtSize); |
| 820 | |
| 821 | // Build the SRB |
| 822 | switch(scmnd->sc_data_direction) |
| 823 | { |
| 824 | case DMA_TO_DEVICE: |
| 825 | request->Type = WRITE_TYPE; |
| 826 | break; |
| 827 | case DMA_FROM_DEVICE: |
| 828 | request->Type = READ_TYPE; |
| 829 | break; |
| 830 | default: |
| 831 | request->Type = UNKNOWN_TYPE; |
| 832 | break; |
| 833 | } |
| 834 | |
| 835 | request->OnIOCompletion = storvsc_commmand_completion; |
| 836 | request->Context = cmd_request;//scmnd; |
| 837 | |
| 838 | //request->PortId = scmnd->device->channel; |
| 839 | request->Host = host_device_ctx->port; |
| 840 | request->Bus = scmnd->device->channel; |
| 841 | request->TargetId = scmnd->device->id; |
| 842 | request->LunId = scmnd->device->lun; |
| 843 | |
| 844 | ASSERT(scmnd->cmd_len <= 16); |
| 845 | request->CdbLen = scmnd->cmd_len; |
| 846 | request->Cdb = scmnd->cmnd; |
| 847 | |
| 848 | request->SenseBuffer = scmnd->sense_buffer; |
| 849 | request->SenseBufferSize = SCSI_SENSE_BUFFERSIZE; |
| 850 | |
| 851 | |
| 852 | #ifdef KERNEL_2_6_27 |
| 853 | request->DataBuffer.Length = scsi_bufflen(scmnd); |
| 854 | if (scsi_sg_count(scmnd)) |
| 855 | #else |
| 856 | request->DataBuffer.Length = scmnd->request_bufflen; |
| 857 | if (scmnd->use_sg) |
| 858 | #endif |
| 859 | { |
| 860 | #ifdef KERNEL_2_6_27 |
| 861 | sgl = (struct scatterlist*)scsi_sglist(scmnd); |
| 862 | #else |
| 863 | sgl = (struct scatterlist*)(scmnd->request_buffer); |
| 864 | #endif |
| 865 | |
| 866 | // check if we need to bounce the sgl |
| 867 | #ifdef KERNEL_2_6_27 |
| 868 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) |
| 869 | #else |
| 870 | if (do_bounce_buffer(sgl, scmnd->use_sg) != -1) |
| 871 | #endif |
| 872 | { |
| 873 | DPRINT_INFO(STORVSC_DRV, "need to bounce buffer for this scmnd %p", scmnd); |
| 874 | #ifdef KERNEL_2_6_27 |
| 875 | cmd_request->bounce_sgl = create_bounce_buffer(sgl, scsi_sg_count(scmnd), scsi_bufflen(scmnd)); |
| 876 | #else |
| 877 | cmd_request->bounce_sgl = create_bounce_buffer( |
| 878 | sgl, |
| 879 | scmnd->use_sg, scmnd->request_bufflen); |
| 880 | #endif |
| 881 | if (!cmd_request->bounce_sgl) |
| 882 | { |
| 883 | DPRINT_ERR(STORVSC_DRV, "unable to create bounce buffer for this scmnd %p", scmnd); |
| 884 | |
| 885 | scmnd->scsi_done = NULL; |
| 886 | scmnd->host_scribble = NULL; |
| 887 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); |
| 888 | |
| 889 | return SCSI_MLQUEUE_HOST_BUSY; |
| 890 | } |
| 891 | |
| 892 | #ifdef KERNEL_2_6_27 |
| 893 | cmd_request->bounce_sgl_count = ALIGN_UP(scsi_bufflen(scmnd), PAGE_SIZE) >> PAGE_SHIFT; |
| 894 | #else |
| 895 | cmd_request->bounce_sgl_count = ALIGN_UP(scmnd->request_bufflen, PAGE_SIZE) >> PAGE_SHIFT; |
| 896 | #endif |
| 897 | |
| 898 | //printk("bouncing buffer allocated %p original buffer %p\n", bounce_sgl, sgl); |
| 899 | //printk("copy_to_bounce_buffer\n"); |
| 900 | // FIXME: We can optimize on reads by just skipping this |
| 901 | #ifdef KERNEL_2_6_27 |
| 902 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, scsi_sg_count(scmnd)); |
| 903 | #else |
| 904 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, scmnd->use_sg); |
| 905 | #endif |
| 906 | |
| 907 | sgl = cmd_request->bounce_sgl; |
| 908 | } |
| 909 | |
| 910 | request->DataBuffer.Offset = sgl[0].offset; |
| 911 | |
| 912 | #ifdef KERNEL_2_6_27 |
| 913 | for (i = 0; i < scsi_sg_count(scmnd); i++ ) |
| 914 | #else |
| 915 | for (i = 0; i < scmnd->use_sg; i++ ) |
| 916 | #endif |
| 917 | { |
| 918 | DPRINT_DBG(STORVSC_DRV, "sgl[%d] len %d offset %d \n", i, sgl[i].length, sgl[i].offset); |
| 919 | #ifdef KERNEL_2_6_27 |
| 920 | request->DataBuffer.PfnArray[i] = page_to_pfn(sg_page((&sgl[i]))); |
| 921 | #else |
| 922 | request->DataBuffer.PfnArray[i] = page_to_pfn(sgl[i].page); |
| 923 | #endif |
| 924 | } |
| 925 | } |
| 926 | |
| 927 | #ifdef KERNEL_2_6_27 |
| 928 | else if (scsi_sglist(scmnd)) |
| 929 | { |
| 930 | ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); |
| 931 | request->DataBuffer.Offset = virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
| 932 | request->DataBuffer.PfnArray[0] = virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
| 933 | } |
| 934 | else |
| 935 | { |
| 936 | ASSERT(scsi_bufflen(scmnd) == 0); |
| 937 | } |
| 938 | #else |
| 939 | else if (scmnd->request_buffer) |
| 940 | { |
| 941 | ASSERT(scmnd->request_bufflen <= PAGE_SIZE); |
| 942 | request->DataBuffer.Offset = virt_to_phys(scmnd->request_buffer) & (PAGE_SIZE-1); |
| 943 | request->DataBuffer.PfnArray[0] = virt_to_phys(scmnd->request_buffer) >> PAGE_SHIFT; |
| 944 | } |
| 945 | else |
| 946 | { |
| 947 | ASSERT(scmnd->request_bufflen == 0); |
| 948 | } |
| 949 | #endif |
| 950 | |
| 951 | retry_request: |
| 952 | |
| 953 | // Invokes the vsc to start an IO |
| 954 | ret = storvsc_drv_obj->OnIORequest(&device_ctx->device_obj, &cmd_request->request); |
| 955 | if (ret == -1) // no more space |
| 956 | { |
| 957 | DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - queue FULL...marking queue busy", scmnd); |
| 958 | |
| 959 | if (cmd_request->bounce_sgl_count) |
| 960 | { |
| 961 | // FIXME: We can optimize on writes by just skipping this |
| 962 | #ifdef KERNEL_2_6_27 |
| 963 | copy_from_bounce_buffer(scsi_sglist(scmnd), cmd_request->bounce_sgl, scsi_sg_count(scmnd)); |
| 964 | #else |
| 965 | copy_from_bounce_buffer( |
| 966 | scmnd->request_buffer, |
| 967 | cmd_request->bounce_sgl, |
| 968 | scmnd->use_sg); |
| 969 | #endif |
| 970 | destroy_bounce_buffer(cmd_request->bounce_sgl, cmd_request->bounce_sgl_count); |
| 971 | } |
| 972 | |
| 973 | kmem_cache_free(host_device_ctx->request_pool, cmd_request); |
| 974 | |
| 975 | scmnd->scsi_done = NULL; |
| 976 | scmnd->host_scribble = NULL; |
| 977 | |
| 978 | ret = SCSI_MLQUEUE_DEVICE_BUSY; |
| 979 | } |
| 980 | |
| 981 | DPRINT_EXIT(STORVSC_DRV); |
| 982 | |
| 983 | return ret; |
| 984 | } |
| 985 | |
| 986 | #ifdef KERNEL_2_6_27 |
| 987 | static int storvsc_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, struct bio_vec *bvec) |
| 988 | { |
| 989 | return bvec->bv_len; //checking done by caller. |
| 990 | } |
| 991 | #else |
| 992 | static int storvsc_merge_bvec(struct request_queue *q, struct bio *bio, struct bio_vec *bvec) |
| 993 | { |
| 994 | // Check if we are adding a new bvec |
| 995 | if (bio->bi_vcnt > 0) |
| 996 | { |
| 997 | //printk("storvsc_merge_bvec() - cnt %u offset %u len %u\n", bio->bi_vcnt, bvec->bv_offset, bvec->bv_len); |
| 998 | |
| 999 | struct bio_vec *prev = &bio->bi_io_vec[bio->bi_vcnt - 1]; |
| 1000 | if (bvec == prev) |
| 1001 | return bvec->bv_len; // success |
| 1002 | |
| 1003 | // Adding new bvec. Make sure the prev one is a complete page |
| 1004 | if (prev->bv_len == PAGE_SIZE && prev->bv_offset == 0) |
| 1005 | { |
| 1006 | return bvec->bv_len; // success |
| 1007 | } |
| 1008 | else |
| 1009 | { |
| 1010 | // Dont reject if the new bvec starts off from the prev one since |
| 1011 | // they will be merge into 1 bvec or blk_rq_map_sg() will merge them into 1 sg element |
| 1012 | if ((bvec->bv_page == prev->bv_page) && |
| 1013 | (bvec->bv_offset == prev->bv_offset + prev->bv_len)) |
| 1014 | { |
| 1015 | return bvec->bv_len; // success |
| 1016 | } |
| 1017 | else |
| 1018 | { |
| 1019 | DPRINT_INFO(STORVSC_DRV, "detected holes in bio request (%p) - cnt %u offset %u len %u", bio, bio->bi_vcnt, bvec->bv_offset, bvec->bv_len); |
| 1020 | return 0; // dont add the bvec to this bio since we dont allow holes in the middle of a multi-pages bio |
| 1021 | } |
| 1022 | } |
| 1023 | } |
| 1024 | |
| 1025 | return bvec->bv_len; // success |
| 1026 | |
| 1027 | } |
| 1028 | |
| 1029 | #endif |
| 1030 | |
| 1031 | /*++ |
| 1032 | |
| 1033 | Name: storvsc_device_configure() |
| 1034 | |
| 1035 | Desc: Configure the specified scsi device |
| 1036 | |
| 1037 | --*/ |
| 1038 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
| 1039 | { |
| 1040 | #ifdef KERNEL_2_6_5 |
| 1041 | #else |
| 1042 | DPRINT_DBG(STORVSC_DRV, "sdev (%p) - setting device flag to %d", sdevice, BLIST_SPARSELUN); |
| 1043 | // This enables luns to be located sparsely. Otherwise, we may not discovered them. |
| 1044 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; |
| 1045 | #endif |
| 1046 | return 0; |
| 1047 | } |
| 1048 | |
| 1049 | static int storvsc_device_configure(struct scsi_device *sdevice) |
| 1050 | { |
| 1051 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - curr queue depth %d", sdevice, sdevice->queue_depth); |
| 1052 | |
| 1053 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting queue depth to %d", sdevice, STORVSC_MAX_IO_REQUESTS); |
| 1054 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, STORVSC_MAX_IO_REQUESTS); |
| 1055 | |
| 1056 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %d", sdevice, PAGE_SIZE); |
| 1057 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
| 1058 | |
| 1059 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", sdevice); |
| 1060 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
| 1061 | |
| 1062 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); |
| 1063 | //sdevice->timeout = (2000 * HZ);//(75 * HZ); |
| 1064 | |
| 1065 | return 0; |
| 1066 | } |
| 1067 | |
| 1068 | /*++ |
| 1069 | |
| 1070 | Name: storvsc_host_reset_handler() |
| 1071 | |
| 1072 | Desc: Reset the scsi HBA |
| 1073 | |
| 1074 | --*/ |
| 1075 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
| 1076 | { |
| 1077 | int ret=SUCCESS; |
| 1078 | struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata; |
| 1079 | struct device_context *device_ctx = host_device_ctx->device_ctx; |
| 1080 | struct driver_context *driver_ctx = driver_to_driver_context(device_ctx->device.driver); |
| 1081 | struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; |
| 1082 | |
| 1083 | STORVSC_DRIVER_OBJECT *storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; |
| 1084 | |
| 1085 | DPRINT_ENTER(STORVSC_DRV); |
| 1086 | |
| 1087 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", scmnd->device, &device_ctx->device_obj); |
| 1088 | |
| 1089 | // Invokes the vsc to reset the host/bus |
| 1090 | ASSERT(storvsc_drv_obj->OnHostReset); |
| 1091 | ret = storvsc_drv_obj->OnHostReset(&device_ctx->device_obj); |
| 1092 | if (ret != 0) |
| 1093 | { |
| 1094 | DPRINT_EXIT(STORVSC_DRV); |
| 1095 | return ret; |
| 1096 | } |
| 1097 | |
| 1098 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", scmnd->device, &device_ctx->device_obj); |
| 1099 | |
| 1100 | DPRINT_EXIT(STORVSC_DRV); |
| 1101 | |
| 1102 | return ret; |
| 1103 | } |
| 1104 | |
| 1105 | /*++ |
| 1106 | |
| 1107 | Name: storvsc_host_rescan |
| 1108 | |
| 1109 | Desc: Rescan the scsi HBA |
| 1110 | |
| 1111 | --*/ |
| 1112 | #if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) |
| 1113 | #else |
| 1114 | |
| 1115 | #ifdef KERNEL_2_6_27 |
| 1116 | static void storvsc_host_rescan_callback(struct work_struct *work) |
| 1117 | { |
| 1118 | DEVICE_OBJECT* device_obj = |
| 1119 | &((struct host_device_context*)work)->device_ctx->device_obj; |
| 1120 | #else |
| 1121 | static void storvsc_host_rescan_callback(void* context) |
| 1122 | { |
| 1123 | |
| 1124 | DEVICE_OBJECT* device_obj = (DEVICE_OBJECT*)context; |
| 1125 | #endif |
| 1126 | struct device_context* device_ctx = to_device_context(device_obj); |
| 1127 | struct Scsi_Host *host = (struct Scsi_Host *)device_ctx->device.driver_data; |
| 1128 | struct scsi_device *sdev; |
| 1129 | struct host_device_context *host_device_ctx; |
| 1130 | struct scsi_device **sdevs_remove_list; |
| 1131 | unsigned int sdevs_count=0; |
| 1132 | unsigned int found; |
| 1133 | unsigned int i; |
| 1134 | unsigned int lun_count=0; |
| 1135 | unsigned int *lun_list; |
| 1136 | |
| 1137 | DPRINT_ENTER(STORVSC_DRV); |
| 1138 | |
| 1139 | host_device_ctx = (struct host_device_context*)host->hostdata; |
| 1140 | lun_list = kzalloc(sizeof(unsigned int)*STORVSC_MAX_LUNS_PER_TARGET, GFP_ATOMIC); |
| 1141 | if (!lun_list) |
| 1142 | { |
| 1143 | DPRINT_ERR(STORVSC_DRV, "unable to allocate lun list"); |
| 1144 | return; |
| 1145 | } |
| 1146 | |
| 1147 | sdevs_remove_list = kzalloc(sizeof(void*)*STORVSC_MAX_LUNS_PER_TARGET, GFP_ATOMIC); |
| 1148 | if (!sdevs_remove_list) |
| 1149 | { |
| 1150 | kfree(lun_list); |
| 1151 | DPRINT_ERR(STORVSC_DRV, "unable to allocate lun remove list"); |
| 1152 | return; |
| 1153 | } |
| 1154 | |
| 1155 | DPRINT_INFO(STORVSC_DRV, "rescanning host for new scsi devices...", device_obj, host_device_ctx->target, host_device_ctx->path); |
| 1156 | |
| 1157 | // Rescan for new device |
| 1158 | scsi_scan_target(&host->shost_gendev, host_device_ctx->path, host_device_ctx->target, SCAN_WILD_CARD, 1); |
| 1159 | |
| 1160 | DPRINT_INFO(STORVSC_DRV, "rescanning host for removed scsi device..."); |
| 1161 | |
| 1162 | // Use the 1st device to send the report luns cmd |
| 1163 | shost_for_each_device(sdev, host) |
| 1164 | { |
| 1165 | lun_count=STORVSC_MAX_LUNS_PER_TARGET; |
| 1166 | storvsc_report_luns(sdev, lun_list, &lun_count); |
| 1167 | |
| 1168 | DPRINT_INFO(STORVSC_DRV, "report luns on scsi device (%p) found %u luns ", sdev, lun_count); |
| 1169 | DPRINT_INFO(STORVSC_DRV, "existing luns on scsi device (%p) host (%d)", sdev, host->host_no); |
| 1170 | |
| 1171 | scsi_device_put(sdev); |
| 1172 | break; |
| 1173 | } |
| 1174 | |
| 1175 | for (i=0; i<lun_count; i++) |
| 1176 | { |
| 1177 | DPRINT_INFO(STORVSC_DRV, "%d) lun %u", i, lun_list[i]); |
| 1178 | } |
| 1179 | |
| 1180 | // Rescan for devices that may have been removed. |
| 1181 | // We do not have to worry that new devices may have been added since |
| 1182 | // this callback is serialized by the workqueue ie add/remove are done here. |
| 1183 | shost_for_each_device(sdev, host) |
| 1184 | { |
| 1185 | // See if this device is still here |
| 1186 | found = 0; |
| 1187 | for (i=0; i<lun_count; i++) |
| 1188 | { |
| 1189 | if (sdev->lun == lun_list[i]) |
| 1190 | { |
| 1191 | found = 1; |
| 1192 | break; |
| 1193 | } |
| 1194 | } |
| 1195 | if (!found) |
| 1196 | { |
| 1197 | DPRINT_INFO(STORVSC_DRV, "lun (%u) does not exists", sdev->lun); |
| 1198 | sdevs_remove_list[sdevs_count++] = sdev; |
| 1199 | } |
| 1200 | } |
| 1201 | |
| 1202 | // Now remove the devices |
| 1203 | for (i=0; i< sdevs_count; i++) |
| 1204 | { |
| 1205 | DPRINT_INFO(STORVSC_DRV, "removing scsi device (%p) lun (%u)...", |
| 1206 | sdevs_remove_list[i], sdevs_remove_list[i]->lun); |
| 1207 | |
| 1208 | // make sure it is not removed from underneath us |
| 1209 | if (!scsi_device_get(sdevs_remove_list[i])) |
| 1210 | { |
| 1211 | scsi_remove_device(sdevs_remove_list[i]); |
| 1212 | scsi_device_put(sdevs_remove_list[i]); |
| 1213 | } |
| 1214 | } |
| 1215 | |
| 1216 | DPRINT_INFO(STORVSC_DRV, "rescan completed on dev obj (%p) target (%u) bus (%u)", device_obj, host_device_ctx->target, host_device_ctx->path); |
| 1217 | |
| 1218 | kfree(lun_list); |
| 1219 | kfree(sdevs_remove_list); |
| 1220 | |
| 1221 | DPRINT_EXIT(STORVSC_DRV); |
| 1222 | } |
| 1223 | |
| 1224 | static int storvsc_report_luns(struct scsi_device *sdev, unsigned int luns[], unsigned int *lun_count) |
| 1225 | { |
| 1226 | int i,j; |
| 1227 | unsigned int lun=0; |
| 1228 | unsigned int num_luns; |
| 1229 | int result; |
| 1230 | unsigned char *data; |
| 1231 | #if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) |
| 1232 | #else |
| 1233 | struct scsi_sense_hdr sshdr; |
| 1234 | #endif |
| 1235 | unsigned char cmd[16]={0}; |
| 1236 | unsigned int report_len = 8*(STORVSC_MAX_LUNS_PER_TARGET+1); // Add 1 to cover the report_lun header |
| 1237 | unsigned long long *report_luns; |
| 1238 | const unsigned int in_lun_count = *lun_count; |
| 1239 | |
| 1240 | *lun_count = 0; |
| 1241 | |
| 1242 | report_luns = kzalloc(report_len, GFP_ATOMIC); |
| 1243 | if (!report_luns) |
| 1244 | { |
| 1245 | return -ENOMEM; |
| 1246 | } |
| 1247 | |
| 1248 | cmd[0] = REPORT_LUNS; |
| 1249 | |
| 1250 | // cmd length |
| 1251 | *(unsigned int*)&cmd[6] = cpu_to_be32(report_len); |
| 1252 | |
| 1253 | result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, (unsigned char*)report_luns, report_len, &sshdr, 30*HZ, 3); |
| 1254 | if (result != 0) |
| 1255 | { |
| 1256 | kfree(report_luns); |
| 1257 | return -EBUSY; |
| 1258 | } |
| 1259 | |
| 1260 | // get the length from the first four bytes |
| 1261 | report_len = be32_to_cpu(*(unsigned int*)&report_luns[0]); |
| 1262 | |
| 1263 | num_luns = (report_len / sizeof(unsigned long long)); |
| 1264 | if (num_luns > in_lun_count) |
| 1265 | { |
| 1266 | kfree(report_luns); |
| 1267 | return -EINVAL; |
| 1268 | } |
| 1269 | |
| 1270 | *lun_count = num_luns; |
| 1271 | |
| 1272 | DPRINT_DBG(STORVSC_DRV, "report luns on scsi device (%p) found %u luns ", sdev, num_luns); |
| 1273 | |
| 1274 | // lun id starts at 1 |
| 1275 | for (i=1; i< num_luns+1; i++) |
| 1276 | { |
| 1277 | lun = 0; |
| 1278 | data = (unsigned char*)&report_luns[i]; |
| 1279 | for (j = 0; j < sizeof(lun); j += 2) |
| 1280 | { |
| 1281 | lun = lun | (((data[j] << 8) | data[j + 1]) << (j * 8)); |
| 1282 | } |
| 1283 | |
| 1284 | luns[i-1] = lun; |
| 1285 | } |
| 1286 | |
| 1287 | kfree(report_luns); |
| 1288 | return 0; |
| 1289 | } |
| 1290 | #endif // KERNEL_2_6_9 |
| 1291 | |
| 1292 | static void storvsc_host_rescan(DEVICE_OBJECT* device_obj) |
| 1293 | { |
| 1294 | struct device_context* device_ctx = to_device_context(device_obj); |
| 1295 | struct Scsi_Host *host = (struct Scsi_Host *)device_ctx->device.driver_data; |
| 1296 | struct host_device_context *host_device_ctx; |
| 1297 | |
| 1298 | DPRINT_ENTER(STORVSC_DRV); |
| 1299 | #if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) |
| 1300 | DPRINT_ERR(STORVSC_DRV, "rescan not supported on 2.6.9 kernels!! You will need to reboot if you have added or removed the scsi lun device"); |
| 1301 | #else |
| 1302 | |
| 1303 | host_device_ctx = (struct host_device_context*)host->hostdata; |
| 1304 | |
| 1305 | DPRINT_INFO(STORVSC_DRV, "initiating rescan on dev obj (%p) target (%u) bus (%u)...", device_obj, host_device_ctx->target, host_device_ctx->path); |
| 1306 | |
| 1307 | // We need to queue this since the scanning may block and the caller may be in an intr context |
| 1308 | //scsi_queue_work(host, &host_device_ctx->host_rescan_work); |
| 1309 | schedule_work(&host_device_ctx->host_rescan_work); |
| 1310 | #endif // KERNEL_2_6_9 |
| 1311 | DPRINT_EXIT(STORVSC_DRV); |
| 1312 | } |
| 1313 | |
| 1314 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, sector_t capacity, int *info) |
| 1315 | { |
| 1316 | sector_t total_sectors = capacity; |
| 1317 | sector_t cylinder_times_heads=0; |
| 1318 | sector_t temp=0; |
| 1319 | |
| 1320 | int sectors_per_track=0; |
| 1321 | int heads=0; |
| 1322 | int cylinders=0; |
| 1323 | int rem=0; |
| 1324 | |
| 1325 | if (total_sectors > (65535 * 16 * 255)) { |
| 1326 | total_sectors = (65535 * 16 * 255); |
| 1327 | } |
| 1328 | |
| 1329 | if (total_sectors >= (65535 * 16 * 63)) { |
| 1330 | sectors_per_track = 255; |
| 1331 | heads = 16; |
| 1332 | |
| 1333 | cylinder_times_heads = total_sectors; |
| 1334 | rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads |
| 1335 | } |
| 1336 | else |
| 1337 | { |
| 1338 | sectors_per_track = 17; |
| 1339 | |
| 1340 | cylinder_times_heads = total_sectors; |
| 1341 | rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads |
| 1342 | |
| 1343 | temp = cylinder_times_heads + 1023; |
| 1344 | rem = sector_div(temp, 1024); // sector_div stores the quotient in temp |
| 1345 | |
| 1346 | heads = temp; |
| 1347 | |
| 1348 | if (heads < 4) { |
| 1349 | heads = 4; |
| 1350 | } |
| 1351 | |
| 1352 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { |
| 1353 | sectors_per_track = 31; |
| 1354 | heads = 16; |
| 1355 | |
| 1356 | cylinder_times_heads = total_sectors; |
| 1357 | rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads |
| 1358 | } |
| 1359 | |
| 1360 | if (cylinder_times_heads >= (heads * 1024)) { |
| 1361 | sectors_per_track = 63; |
| 1362 | heads = 16; |
| 1363 | |
| 1364 | cylinder_times_heads = total_sectors; |
| 1365 | rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads |
| 1366 | } |
| 1367 | } |
| 1368 | |
| 1369 | temp = cylinder_times_heads; |
| 1370 | rem = sector_div(temp, heads); // sector_div stores the quotient in temp |
| 1371 | cylinders = temp; |
| 1372 | |
| 1373 | info[0] = heads; |
| 1374 | info[1] = sectors_per_track; |
| 1375 | info[2] = cylinders; |
| 1376 | |
| 1377 | DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, sectors_per_track); |
| 1378 | |
| 1379 | return 0; |
| 1380 | } |
| 1381 | |
| 1382 | MODULE_LICENSE("GPL"); |
| 1383 | |
| 1384 | static int __init storvsc_init(void) |
| 1385 | { |
| 1386 | int ret; |
| 1387 | |
| 1388 | DPRINT_ENTER(STORVSC_DRV); |
| 1389 | |
| 1390 | DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); |
| 1391 | |
| 1392 | ret = storvsc_drv_init(StorVscInitialize); |
| 1393 | |
| 1394 | DPRINT_EXIT(STORVSC_DRV); |
| 1395 | |
| 1396 | return ret; |
| 1397 | } |
| 1398 | |
| 1399 | static void __exit storvsc_exit(void) |
| 1400 | { |
| 1401 | DPRINT_ENTER(STORVSC_DRV); |
| 1402 | |
| 1403 | storvsc_drv_exit(); |
| 1404 | |
| 1405 | DPRINT_ENTER(STORVSC_DRV); |
| 1406 | } |
| 1407 | |
| 1408 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
| 1409 | |
| 1410 | module_init(storvsc_init); |
| 1411 | module_exit(storvsc_exit); |
| 1412 | |
| 1413 | // eof |