Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 1 | /* |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 2 | * Copyright (c) 2009, Microsoft Corporation. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms and conditions of the GNU General Public License, |
| 6 | * version 2, as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| 15 | * Place - Suite 330, Boston, MA 02111-1307 USA. |
| 16 | * |
| 17 | * Authors: |
| 18 | * Haiyang Zhang <haiyangz@microsoft.com> |
| 19 | * Hank Janssen <hjanssen@microsoft.com> |
K. Y. Srinivasan | 972621c | 2011-05-10 07:54:19 -0700 | [diff] [blame] | 20 | * K. Y. Srinivasan <kys@microsoft.com> |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 21 | */ |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 22 | #include <linux/init.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 23 | #include <linux/slab.h> |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 24 | #include <linux/module.h> |
| 25 | #include <linux/device.h> |
| 26 | #include <linux/blkdev.h> |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 27 | #include <scsi/scsi.h> |
| 28 | #include <scsi/scsi_cmnd.h> |
| 29 | #include <scsi/scsi_host.h> |
| 30 | #include <scsi/scsi_device.h> |
| 31 | #include <scsi/scsi_tcq.h> |
| 32 | #include <scsi/scsi_eh.h> |
| 33 | #include <scsi/scsi_devinfo.h> |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 34 | #include <scsi/scsi_dbg.h> |
K. Y. Srinivasan | e3fe0bb | 2011-02-11 10:00:12 -0800 | [diff] [blame] | 35 | #include "hv_api.h" |
Greg Kroah-Hartman | 645954c | 2009-08-28 16:22:59 -0700 | [diff] [blame] | 36 | #include "logging.h" |
Greg Kroah-Hartman | 2d82f6c | 2010-05-05 22:52:28 -0700 | [diff] [blame] | 37 | #include "version_info.h" |
Greg Kroah-Hartman | 870cde8 | 2009-08-19 16:21:28 -0700 | [diff] [blame] | 38 | #include "vmbus.h" |
Greg Kroah-Hartman | bb96979 | 2010-05-05 22:40:43 -0700 | [diff] [blame] | 39 | #include "storvsc_api.h" |
K. Y. Srinivasan | af3043c | 2011-03-23 10:50:33 -0700 | [diff] [blame] | 40 | #include "vstorage.h" |
| 41 | #include "channel.h" |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 42 | |
K. Y. Srinivasan | 2db2cab | 2011-05-10 07:54:39 -0700 | [diff] [blame] | 43 | static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 44 | |
K. Y. Srinivasan | 3d598ce | 2011-05-10 07:54:40 -0700 | [diff] [blame] | 45 | module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
| 46 | MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); |
| 47 | |
K. Y. Srinivasan | 0f0cdc6 | 2011-05-10 07:54:18 -0700 | [diff] [blame] | 48 | static const char *driver_name = "storvsc"; |
K. Y. Srinivasan | 6dec244 | 2011-03-23 10:50:25 -0700 | [diff] [blame] | 49 | |
| 50 | /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */ |
| 51 | static const struct hv_guid gStorVscDeviceType = { |
| 52 | .data = { |
| 53 | 0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, |
| 54 | 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f |
| 55 | } |
| 56 | }; |
| 57 | |
K. Y. Srinivasan | 972621c | 2011-05-10 07:54:19 -0700 | [diff] [blame] | 58 | struct hv_host_device { |
K. Y. Srinivasan | 97c1529 | 2011-05-10 07:54:21 -0700 | [diff] [blame] | 59 | struct hv_device *dev; |
Greg Kroah-Hartman | ff568d3 | 2009-09-02 08:37:47 -0700 | [diff] [blame] | 60 | struct kmem_cache *request_pool; |
| 61 | unsigned int port; |
| 62 | unsigned char path; |
| 63 | unsigned char target; |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 64 | }; |
| 65 | |
| 66 | struct storvsc_cmd_request { |
Greg Kroah-Hartman | ff568d3 | 2009-09-02 08:37:47 -0700 | [diff] [blame] | 67 | struct list_head entry; |
| 68 | struct scsi_cmnd *cmd; |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 69 | |
| 70 | unsigned int bounce_sgl_count; |
Greg Kroah-Hartman | ff568d3 | 2009-09-02 08:37:47 -0700 | [diff] [blame] | 71 | struct scatterlist *bounce_sgl; |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 72 | |
Nicolas Palix | 0b3f683 | 2009-07-29 14:10:19 +0200 | [diff] [blame] | 73 | struct hv_storvsc_request request; |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 74 | }; |
| 75 | |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 76 | |
K. Y. Srinivasan | 6dec244 | 2011-03-23 10:50:25 -0700 | [diff] [blame] | 77 | /* |
K. Y. Srinivasan | cf6fdfb | 2011-05-10 07:54:36 -0700 | [diff] [blame] | 78 | * storvsc_initialize - Main entry point |
K. Y. Srinivasan | 6dec244 | 2011-03-23 10:50:25 -0700 | [diff] [blame] | 79 | */ |
K. Y. Srinivasan | cf6fdfb | 2011-05-10 07:54:36 -0700 | [diff] [blame] | 80 | static int storvsc_initialize(struct hv_driver *driver) |
K. Y. Srinivasan | 6dec244 | 2011-03-23 10:50:25 -0700 | [diff] [blame] | 81 | { |
K. Y. Srinivasan | 2e79505 | 2011-05-10 07:53:52 -0700 | [diff] [blame] | 82 | struct storvsc_driver *stor_driver; |
K. Y. Srinivasan | 6dec244 | 2011-03-23 10:50:25 -0700 | [diff] [blame] | 83 | |
K. Y. Srinivasan | ced01b0 | 2011-03-28 09:33:29 -0700 | [diff] [blame] | 84 | stor_driver = hvdr_to_stordr(driver); |
K. Y. Srinivasan | 6dec244 | 2011-03-23 10:50:25 -0700 | [diff] [blame] | 85 | |
K. Y. Srinivasan | 6dec244 | 2011-03-23 10:50:25 -0700 | [diff] [blame] | 86 | |
| 87 | /* Make sure we are at least 2 pages since 1 page is used for control */ |
| 88 | |
K. Y. Srinivasan | 0f0cdc6 | 2011-05-10 07:54:18 -0700 | [diff] [blame] | 89 | driver->name = driver_name; |
K. Y. Srinivasan | 6dec244 | 2011-03-23 10:50:25 -0700 | [diff] [blame] | 90 | memcpy(&driver->dev_type, &gStorVscDeviceType, |
| 91 | sizeof(struct hv_guid)); |
| 92 | |
K. Y. Srinivasan | 6dec244 | 2011-03-23 10:50:25 -0700 | [diff] [blame] | 93 | |
| 94 | /* |
| 95 | * Divide the ring buffer data size (which is 1 page less |
| 96 | * than the ring buffer size since that page is reserved for |
| 97 | * the ring buffer indices) by the max request size (which is |
| 98 | * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) |
| 99 | */ |
| 100 | stor_driver->max_outstanding_req_per_channel = |
| 101 | ((stor_driver->ring_buffer_size - PAGE_SIZE) / |
| 102 | ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + |
| 103 | sizeof(struct vstor_packet) + sizeof(u64), |
| 104 | sizeof(u64))); |
| 105 | |
| 106 | DPRINT_INFO(STORVSC, "max io %u, currently %u\n", |
| 107 | stor_driver->max_outstanding_req_per_channel, |
| 108 | STORVSC_MAX_IO_REQUESTS); |
| 109 | |
| 110 | /* Setup the dispatch table */ |
K. Y. Srinivasan | 2ac5dad | 2011-05-10 07:53:57 -0700 | [diff] [blame] | 111 | stor_driver->base.dev_add = storvsc_dev_add; |
K. Y. Srinivasan | cb706b04 | 2011-05-10 07:53:58 -0700 | [diff] [blame] | 112 | stor_driver->base.dev_rm = storvsc_dev_remove; |
K. Y. Srinivasan | 6dec244 | 2011-03-23 10:50:25 -0700 | [diff] [blame] | 113 | |
K. Y. Srinivasan | bb46592 | 2011-05-10 07:54:02 -0700 | [diff] [blame] | 114 | stor_driver->on_io_request = storvsc_do_io; |
K. Y. Srinivasan | 6dec244 | 2011-03-23 10:50:25 -0700 | [diff] [blame] | 115 | |
| 116 | return 0; |
| 117 | } |
| 118 | |
K. Y. Srinivasan | 5b60ace | 2011-05-10 07:54:25 -0700 | [diff] [blame] | 119 | static int storvsc_device_alloc(struct scsi_device *sdevice) |
| 120 | { |
| 121 | /* |
| 122 | * This enables luns to be located sparsely. Otherwise, we may not |
| 123 | * discovered them. |
| 124 | */ |
| 125 | sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; |
| 126 | return 0; |
| 127 | } |
| 128 | |
K. Y. Srinivasan | a1ebfea | 2011-05-10 07:54:26 -0700 | [diff] [blame] | 129 | static int storvsc_merge_bvec(struct request_queue *q, |
| 130 | struct bvec_merge_data *bmd, struct bio_vec *bvec) |
| 131 | { |
| 132 | /* checking done by caller. */ |
| 133 | return bvec->bv_len; |
| 134 | } |
| 135 | |
K. Y. Srinivasan | 419f2d0 | 2011-05-10 07:54:27 -0700 | [diff] [blame] | 136 | static int storvsc_device_configure(struct scsi_device *sdevice) |
| 137 | { |
| 138 | scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, |
| 139 | STORVSC_MAX_IO_REQUESTS); |
| 140 | |
| 141 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld", |
| 142 | sdevice, PAGE_SIZE); |
| 143 | blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
| 144 | |
| 145 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", |
| 146 | sdevice); |
| 147 | blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
| 148 | |
| 149 | blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); |
| 150 | /* sdevice->timeout = (2000 * HZ);//(75 * HZ); */ |
| 151 | |
| 152 | return 0; |
| 153 | } |
| 154 | |
K. Y. Srinivasan | 49a3c7a | 2011-05-10 07:54:28 -0700 | [diff] [blame] | 155 | static void destroy_bounce_buffer(struct scatterlist *sgl, |
| 156 | unsigned int sg_count) |
| 157 | { |
| 158 | int i; |
| 159 | struct page *page_buf; |
| 160 | |
| 161 | for (i = 0; i < sg_count; i++) { |
| 162 | page_buf = sg_page((&sgl[i])); |
| 163 | if (page_buf != NULL) |
| 164 | __free_page(page_buf); |
| 165 | } |
| 166 | |
| 167 | kfree(sgl); |
| 168 | } |
| 169 | |
K. Y. Srinivasan | 3862ef3 | 2011-05-10 07:54:29 -0700 | [diff] [blame] | 170 | static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
| 171 | { |
| 172 | int i; |
| 173 | |
| 174 | /* No need to check */ |
| 175 | if (sg_count < 2) |
| 176 | return -1; |
| 177 | |
| 178 | /* We have at least 2 sg entries */ |
| 179 | for (i = 0; i < sg_count; i++) { |
| 180 | if (i == 0) { |
| 181 | /* make sure 1st one does not have hole */ |
| 182 | if (sgl[i].offset + sgl[i].length != PAGE_SIZE) |
| 183 | return i; |
| 184 | } else if (i == sg_count - 1) { |
| 185 | /* make sure last one does not have hole */ |
| 186 | if (sgl[i].offset != 0) |
| 187 | return i; |
| 188 | } else { |
| 189 | /* make sure no hole in the middle */ |
| 190 | if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) |
| 191 | return i; |
| 192 | } |
| 193 | } |
| 194 | return -1; |
| 195 | } |
| 196 | |
K. Y. Srinivasan | a9753cb | 2011-05-10 07:54:30 -0700 | [diff] [blame] | 197 | static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, |
| 198 | unsigned int sg_count, |
| 199 | unsigned int len) |
| 200 | { |
| 201 | int i; |
| 202 | int num_pages; |
| 203 | struct scatterlist *bounce_sgl; |
| 204 | struct page *page_buf; |
| 205 | |
| 206 | num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; |
| 207 | |
| 208 | bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); |
| 209 | if (!bounce_sgl) |
| 210 | return NULL; |
| 211 | |
| 212 | for (i = 0; i < num_pages; i++) { |
| 213 | page_buf = alloc_page(GFP_ATOMIC); |
| 214 | if (!page_buf) |
| 215 | goto cleanup; |
| 216 | sg_set_page(&bounce_sgl[i], page_buf, 0, 0); |
| 217 | } |
| 218 | |
| 219 | return bounce_sgl; |
| 220 | |
| 221 | cleanup: |
| 222 | destroy_bounce_buffer(bounce_sgl, num_pages); |
| 223 | return NULL; |
| 224 | } |
| 225 | |
K. Y. Srinivasan | 29fe2c9 | 2011-05-10 07:54:31 -0700 | [diff] [blame] | 226 | |
| 227 | /* Assume the original sgl has enough room */ |
| 228 | static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, |
| 229 | struct scatterlist *bounce_sgl, |
| 230 | unsigned int orig_sgl_count) |
| 231 | { |
| 232 | int i; |
| 233 | int j = 0; |
| 234 | unsigned long src, dest; |
| 235 | unsigned int srclen, destlen, copylen; |
| 236 | unsigned int total_copied = 0; |
| 237 | unsigned long bounce_addr = 0; |
| 238 | unsigned long dest_addr = 0; |
| 239 | unsigned long flags; |
| 240 | |
| 241 | local_irq_save(flags); |
| 242 | |
| 243 | for (i = 0; i < orig_sgl_count; i++) { |
| 244 | dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), |
| 245 | KM_IRQ0) + orig_sgl[i].offset; |
| 246 | dest = dest_addr; |
| 247 | destlen = orig_sgl[i].length; |
| 248 | |
| 249 | if (bounce_addr == 0) |
| 250 | bounce_addr = |
| 251 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), |
| 252 | KM_IRQ0); |
| 253 | |
| 254 | while (destlen) { |
| 255 | src = bounce_addr + bounce_sgl[j].offset; |
| 256 | srclen = bounce_sgl[j].length - bounce_sgl[j].offset; |
| 257 | |
| 258 | copylen = min(srclen, destlen); |
| 259 | memcpy((void *)dest, (void *)src, copylen); |
| 260 | |
| 261 | total_copied += copylen; |
| 262 | bounce_sgl[j].offset += copylen; |
| 263 | destlen -= copylen; |
| 264 | dest += copylen; |
| 265 | |
| 266 | if (bounce_sgl[j].offset == bounce_sgl[j].length) { |
| 267 | /* full */ |
| 268 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); |
| 269 | j++; |
| 270 | |
| 271 | /* if we need to use another bounce buffer */ |
| 272 | if (destlen || i != orig_sgl_count - 1) |
| 273 | bounce_addr = |
| 274 | (unsigned long)kmap_atomic( |
| 275 | sg_page((&bounce_sgl[j])), KM_IRQ0); |
| 276 | } else if (destlen == 0 && i == orig_sgl_count - 1) { |
| 277 | /* unmap the last bounce that is < PAGE_SIZE */ |
| 278 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), |
| 283 | KM_IRQ0); |
| 284 | } |
| 285 | |
| 286 | local_irq_restore(flags); |
| 287 | |
| 288 | return total_copied; |
| 289 | } |
| 290 | |
K. Y. Srinivasan | 6a8ff44 | 2011-05-10 07:54:32 -0700 | [diff] [blame] | 291 | |
| 292 | /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ |
| 293 | static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, |
| 294 | struct scatterlist *bounce_sgl, |
| 295 | unsigned int orig_sgl_count) |
| 296 | { |
| 297 | int i; |
| 298 | int j = 0; |
| 299 | unsigned long src, dest; |
| 300 | unsigned int srclen, destlen, copylen; |
| 301 | unsigned int total_copied = 0; |
| 302 | unsigned long bounce_addr = 0; |
| 303 | unsigned long src_addr = 0; |
| 304 | unsigned long flags; |
| 305 | |
| 306 | local_irq_save(flags); |
| 307 | |
| 308 | for (i = 0; i < orig_sgl_count; i++) { |
| 309 | src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), |
| 310 | KM_IRQ0) + orig_sgl[i].offset; |
| 311 | src = src_addr; |
| 312 | srclen = orig_sgl[i].length; |
| 313 | |
| 314 | if (bounce_addr == 0) |
| 315 | bounce_addr = |
| 316 | (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), |
| 317 | KM_IRQ0); |
| 318 | |
| 319 | while (srclen) { |
| 320 | /* assume bounce offset always == 0 */ |
| 321 | dest = bounce_addr + bounce_sgl[j].length; |
| 322 | destlen = PAGE_SIZE - bounce_sgl[j].length; |
| 323 | |
| 324 | copylen = min(srclen, destlen); |
| 325 | memcpy((void *)dest, (void *)src, copylen); |
| 326 | |
| 327 | total_copied += copylen; |
| 328 | bounce_sgl[j].length += copylen; |
| 329 | srclen -= copylen; |
| 330 | src += copylen; |
| 331 | |
| 332 | if (bounce_sgl[j].length == PAGE_SIZE) { |
| 333 | /* full..move to next entry */ |
| 334 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); |
| 335 | j++; |
| 336 | |
| 337 | /* if we need to use another bounce buffer */ |
| 338 | if (srclen || i != orig_sgl_count - 1) |
| 339 | bounce_addr = |
| 340 | (unsigned long)kmap_atomic( |
| 341 | sg_page((&bounce_sgl[j])), KM_IRQ0); |
| 342 | |
| 343 | } else if (srclen == 0 && i == orig_sgl_count - 1) { |
| 344 | /* unmap the last bounce that is < PAGE_SIZE */ |
| 345 | kunmap_atomic((void *)bounce_addr, KM_IRQ0); |
| 346 | } |
| 347 | } |
| 348 | |
| 349 | kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); |
| 350 | } |
| 351 | |
| 352 | local_irq_restore(flags); |
| 353 | |
| 354 | return total_copied; |
| 355 | } |
| 356 | |
K. Y. Srinivasan | 5c5c023 | 2011-05-10 07:54:33 -0700 | [diff] [blame] | 357 | |
| 358 | /* |
| 359 | * storvsc_remove - Callback when our device is removed |
| 360 | */ |
| 361 | static int storvsc_remove(struct hv_device *dev) |
| 362 | { |
| 363 | struct storvsc_driver *storvsc_drv_obj = |
| 364 | drv_to_stordrv(dev->device.driver); |
| 365 | struct Scsi_Host *host = dev_get_drvdata(&dev->device); |
| 366 | struct hv_host_device *host_dev = |
| 367 | (struct hv_host_device *)host->hostdata; |
| 368 | |
| 369 | /* |
| 370 | * Call to the vsc driver to let it know that the device is being |
| 371 | * removed |
| 372 | */ |
| 373 | storvsc_drv_obj->base.dev_rm(dev); |
| 374 | |
| 375 | if (host_dev->request_pool) { |
| 376 | kmem_cache_destroy(host_dev->request_pool); |
| 377 | host_dev->request_pool = NULL; |
| 378 | } |
| 379 | |
| 380 | DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); |
| 381 | scsi_remove_host(host); |
| 382 | |
| 383 | DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); |
| 384 | scsi_host_put(host); |
| 385 | return 0; |
| 386 | } |
| 387 | |
K. Y. Srinivasan | 62838ce | 2011-05-10 07:54:34 -0700 | [diff] [blame] | 388 | |
| 389 | static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
| 390 | sector_t capacity, int *info) |
| 391 | { |
| 392 | sector_t total_sectors = capacity; |
| 393 | sector_t cylinder_times_heads = 0; |
| 394 | sector_t temp = 0; |
| 395 | |
| 396 | int sectors_per_track = 0; |
| 397 | int heads = 0; |
| 398 | int cylinders = 0; |
| 399 | int rem = 0; |
| 400 | |
| 401 | if (total_sectors > (65535 * 16 * 255)) |
| 402 | total_sectors = (65535 * 16 * 255); |
| 403 | |
| 404 | if (total_sectors >= (65535 * 16 * 63)) { |
| 405 | sectors_per_track = 255; |
| 406 | heads = 16; |
| 407 | |
| 408 | cylinder_times_heads = total_sectors; |
| 409 | /* sector_div stores the quotient in cylinder_times_heads */ |
| 410 | rem = sector_div(cylinder_times_heads, sectors_per_track); |
| 411 | } else { |
| 412 | sectors_per_track = 17; |
| 413 | |
| 414 | cylinder_times_heads = total_sectors; |
| 415 | /* sector_div stores the quotient in cylinder_times_heads */ |
| 416 | rem = sector_div(cylinder_times_heads, sectors_per_track); |
| 417 | |
| 418 | temp = cylinder_times_heads + 1023; |
| 419 | /* sector_div stores the quotient in temp */ |
| 420 | rem = sector_div(temp, 1024); |
| 421 | |
| 422 | heads = temp; |
| 423 | |
| 424 | if (heads < 4) |
| 425 | heads = 4; |
| 426 | |
| 427 | if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { |
| 428 | sectors_per_track = 31; |
| 429 | heads = 16; |
| 430 | |
| 431 | cylinder_times_heads = total_sectors; |
| 432 | /* |
| 433 | * sector_div stores the quotient in |
| 434 | * cylinder_times_heads |
| 435 | */ |
| 436 | rem = sector_div(cylinder_times_heads, |
| 437 | sectors_per_track); |
| 438 | } |
| 439 | |
| 440 | if (cylinder_times_heads >= (heads * 1024)) { |
| 441 | sectors_per_track = 63; |
| 442 | heads = 16; |
| 443 | |
| 444 | cylinder_times_heads = total_sectors; |
| 445 | /* |
| 446 | * sector_div stores the quotient in |
| 447 | * cylinder_times_heads |
| 448 | */ |
| 449 | rem = sector_div(cylinder_times_heads, |
| 450 | sectors_per_track); |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | temp = cylinder_times_heads; |
| 455 | /* sector_div stores the quotient in temp */ |
| 456 | rem = sector_div(temp, heads); |
| 457 | cylinders = temp; |
| 458 | |
| 459 | info[0] = heads; |
| 460 | info[1] = sectors_per_track; |
| 461 | info[2] = cylinders; |
| 462 | |
| 463 | DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, |
| 464 | sectors_per_track); |
| 465 | |
| 466 | return 0; |
| 467 | } |
K. Y. Srinivasan | aa3d789 | 2011-05-10 07:54:37 -0700 | [diff] [blame] | 468 | |
| 469 | static int storvsc_host_reset(struct hv_device *device) |
| 470 | { |
| 471 | struct storvsc_device *stor_device; |
| 472 | struct hv_storvsc_request *request; |
| 473 | struct vstor_packet *vstor_packet; |
| 474 | int ret, t; |
| 475 | |
| 476 | DPRINT_INFO(STORVSC, "resetting host adapter..."); |
| 477 | |
| 478 | stor_device = get_stor_device(device); |
| 479 | if (!stor_device) |
| 480 | return -1; |
| 481 | |
| 482 | request = &stor_device->reset_request; |
| 483 | vstor_packet = &request->vstor_packet; |
| 484 | |
| 485 | init_completion(&request->wait_event); |
| 486 | |
| 487 | vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; |
| 488 | vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
| 489 | vstor_packet->vm_srb.path_id = stor_device->path_id; |
| 490 | |
| 491 | ret = vmbus_sendpacket(device->channel, vstor_packet, |
| 492 | sizeof(struct vstor_packet), |
| 493 | (unsigned long)&stor_device->reset_request, |
| 494 | VM_PKT_DATA_INBAND, |
| 495 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| 496 | if (ret != 0) |
| 497 | goto cleanup; |
| 498 | |
| 499 | t = wait_for_completion_timeout(&request->wait_event, HZ); |
| 500 | if (t == 0) { |
| 501 | ret = -ETIMEDOUT; |
| 502 | goto cleanup; |
| 503 | } |
| 504 | |
| 505 | DPRINT_INFO(STORVSC, "host adapter reset completed"); |
| 506 | |
| 507 | /* |
| 508 | * At this point, all outstanding requests in the adapter |
| 509 | * should have been flushed out and return to us |
| 510 | */ |
| 511 | |
| 512 | cleanup: |
| 513 | put_stor_device(device); |
| 514 | return ret; |
| 515 | } |
| 516 | |
| 517 | |
K. Y. Srinivasan | 96e690be | 2011-05-10 07:54:38 -0700 | [diff] [blame] | 518 | /* |
| 519 | * storvsc_host_reset_handler - Reset the scsi HBA |
| 520 | */ |
| 521 | static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
| 522 | { |
| 523 | int ret; |
| 524 | struct hv_host_device *host_dev = |
| 525 | (struct hv_host_device *)scmnd->device->host->hostdata; |
| 526 | struct hv_device *dev = host_dev->dev; |
| 527 | |
| 528 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", |
| 529 | scmnd->device, dev); |
| 530 | |
| 531 | /* Invokes the vsc to reset the host/bus */ |
| 532 | ret = storvsc_host_reset(dev); |
| 533 | if (ret != 0) |
| 534 | return ret; |
| 535 | |
| 536 | DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", |
| 537 | scmnd->device, dev); |
| 538 | |
| 539 | return ret; |
| 540 | } |
| 541 | |
K. Y. Srinivasan | 8a411ba | 2011-05-10 07:54:41 -0700 | [diff] [blame] | 542 | |
| 543 | /* |
| 544 | * storvsc_commmand_completion - Command completion processing |
| 545 | */ |
| 546 | static void storvsc_commmand_completion(struct hv_storvsc_request *request) |
| 547 | { |
| 548 | struct storvsc_cmd_request *cmd_request = |
| 549 | (struct storvsc_cmd_request *)request->context; |
| 550 | struct scsi_cmnd *scmnd = cmd_request->cmd; |
| 551 | struct hv_host_device *host_dev = |
| 552 | (struct hv_host_device *)scmnd->device->host->hostdata; |
| 553 | void (*scsi_done_fn)(struct scsi_cmnd *); |
| 554 | struct scsi_sense_hdr sense_hdr; |
| 555 | struct vmscsi_request *vm_srb; |
| 556 | |
| 557 | /* ASSERT(request == &cmd_request->request); */ |
| 558 | /* ASSERT(scmnd); */ |
| 559 | /* ASSERT((unsigned long)scmnd->host_scribble == */ |
| 560 | /* (unsigned long)cmd_request); */ |
| 561 | /* ASSERT(scmnd->scsi_done); */ |
| 562 | |
| 563 | if (cmd_request->bounce_sgl_count) { |
| 564 | /* using bounce buffer */ |
| 565 | /* printk("copy_from_bounce_buffer\n"); */ |
| 566 | |
| 567 | /* FIXME: We can optimize on writes by just skipping this */ |
| 568 | copy_from_bounce_buffer(scsi_sglist(scmnd), |
| 569 | cmd_request->bounce_sgl, |
| 570 | scsi_sg_count(scmnd)); |
| 571 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
| 572 | cmd_request->bounce_sgl_count); |
| 573 | } |
| 574 | |
| 575 | vm_srb = &request->vstor_packet.vm_srb; |
| 576 | scmnd->result = vm_srb->scsi_status; |
| 577 | |
| 578 | if (scmnd->result) { |
| 579 | if (scsi_normalize_sense(scmnd->sense_buffer, |
| 580 | SCSI_SENSE_BUFFERSIZE, &sense_hdr)) |
| 581 | scsi_print_sense_hdr("storvsc", &sense_hdr); |
| 582 | } |
| 583 | |
| 584 | /* ASSERT(request->BytesXfer <= request->data_buffer.Length); */ |
| 585 | scsi_set_resid(scmnd, |
| 586 | request->data_buffer.len - |
| 587 | vm_srb->data_transfer_length); |
| 588 | |
| 589 | scsi_done_fn = scmnd->scsi_done; |
| 590 | |
| 591 | scmnd->host_scribble = NULL; |
| 592 | scmnd->scsi_done = NULL; |
| 593 | |
| 594 | /* !!DO NOT MODIFY the scmnd after this call */ |
| 595 | scsi_done_fn(scmnd); |
| 596 | |
| 597 | kmem_cache_free(host_dev->request_pool, cmd_request); |
| 598 | } |
| 599 | |
K. Y. Srinivasan | c5b463a | 2011-05-10 07:54:42 -0700 | [diff] [blame] | 600 | |
| 601 | /* |
| 602 | * storvsc_queuecommand - Initiate command processing |
| 603 | */ |
| 604 | static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, |
| 605 | void (*done)(struct scsi_cmnd *)) |
| 606 | { |
| 607 | int ret; |
| 608 | struct hv_host_device *host_dev = |
| 609 | (struct hv_host_device *)scmnd->device->host->hostdata; |
| 610 | struct hv_device *dev = host_dev->dev; |
| 611 | struct storvsc_driver *storvsc_drv_obj = |
| 612 | drv_to_stordrv(dev->device.driver); |
| 613 | struct hv_storvsc_request *request; |
| 614 | struct storvsc_cmd_request *cmd_request; |
| 615 | unsigned int request_size = 0; |
| 616 | int i; |
| 617 | struct scatterlist *sgl; |
| 618 | unsigned int sg_count = 0; |
| 619 | struct vmscsi_request *vm_srb; |
| 620 | |
| 621 | |
| 622 | /* If retrying, no need to prep the cmd */ |
| 623 | if (scmnd->host_scribble) { |
| 624 | /* ASSERT(scmnd->scsi_done != NULL); */ |
| 625 | |
| 626 | cmd_request = |
| 627 | (struct storvsc_cmd_request *)scmnd->host_scribble; |
| 628 | DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", |
| 629 | scmnd, cmd_request); |
| 630 | |
| 631 | goto retry_request; |
| 632 | } |
| 633 | |
| 634 | /* ASSERT(scmnd->scsi_done == NULL); */ |
| 635 | /* ASSERT(scmnd->host_scribble == NULL); */ |
| 636 | |
| 637 | scmnd->scsi_done = done; |
| 638 | |
| 639 | request_size = sizeof(struct storvsc_cmd_request); |
| 640 | |
| 641 | cmd_request = kmem_cache_zalloc(host_dev->request_pool, |
| 642 | GFP_ATOMIC); |
| 643 | if (!cmd_request) { |
| 644 | scmnd->scsi_done = NULL; |
| 645 | return SCSI_MLQUEUE_DEVICE_BUSY; |
| 646 | } |
| 647 | |
| 648 | /* Setup the cmd request */ |
| 649 | cmd_request->bounce_sgl_count = 0; |
| 650 | cmd_request->bounce_sgl = NULL; |
| 651 | cmd_request->cmd = scmnd; |
| 652 | |
| 653 | scmnd->host_scribble = (unsigned char *)cmd_request; |
| 654 | |
| 655 | request = &cmd_request->request; |
| 656 | vm_srb = &request->vstor_packet.vm_srb; |
| 657 | |
| 658 | |
| 659 | /* Build the SRB */ |
| 660 | switch (scmnd->sc_data_direction) { |
| 661 | case DMA_TO_DEVICE: |
| 662 | vm_srb->data_in = WRITE_TYPE; |
| 663 | break; |
| 664 | case DMA_FROM_DEVICE: |
| 665 | vm_srb->data_in = READ_TYPE; |
| 666 | break; |
| 667 | default: |
| 668 | vm_srb->data_in = UNKNOWN_TYPE; |
| 669 | break; |
| 670 | } |
| 671 | |
| 672 | request->on_io_completion = storvsc_commmand_completion; |
| 673 | request->context = cmd_request;/* scmnd; */ |
| 674 | |
| 675 | /* request->PortId = scmnd->device->channel; */ |
| 676 | vm_srb->port_number = host_dev->port; |
| 677 | vm_srb->path_id = scmnd->device->channel; |
| 678 | vm_srb->target_id = scmnd->device->id; |
| 679 | vm_srb->lun = scmnd->device->lun; |
| 680 | |
| 681 | /* ASSERT(scmnd->cmd_len <= 16); */ |
| 682 | vm_srb->cdb_length = scmnd->cmd_len; |
| 683 | |
| 684 | memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); |
| 685 | |
| 686 | request->sense_buffer = scmnd->sense_buffer; |
| 687 | |
| 688 | |
| 689 | request->data_buffer.len = scsi_bufflen(scmnd); |
| 690 | if (scsi_sg_count(scmnd)) { |
| 691 | sgl = (struct scatterlist *)scsi_sglist(scmnd); |
| 692 | sg_count = scsi_sg_count(scmnd); |
| 693 | |
| 694 | /* check if we need to bounce the sgl */ |
| 695 | if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { |
| 696 | cmd_request->bounce_sgl = |
| 697 | create_bounce_buffer(sgl, scsi_sg_count(scmnd), |
| 698 | scsi_bufflen(scmnd)); |
| 699 | if (!cmd_request->bounce_sgl) { |
| 700 | scmnd->scsi_done = NULL; |
| 701 | scmnd->host_scribble = NULL; |
| 702 | kmem_cache_free(host_dev->request_pool, |
| 703 | cmd_request); |
| 704 | |
| 705 | return SCSI_MLQUEUE_HOST_BUSY; |
| 706 | } |
| 707 | |
| 708 | cmd_request->bounce_sgl_count = |
| 709 | ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> |
| 710 | PAGE_SHIFT; |
| 711 | |
| 712 | /* |
| 713 | * FIXME: We can optimize on reads by just skipping |
| 714 | * this |
| 715 | */ |
| 716 | copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, |
| 717 | scsi_sg_count(scmnd)); |
| 718 | |
| 719 | sgl = cmd_request->bounce_sgl; |
| 720 | sg_count = cmd_request->bounce_sgl_count; |
| 721 | } |
| 722 | |
| 723 | request->data_buffer.offset = sgl[0].offset; |
| 724 | |
| 725 | for (i = 0; i < sg_count; i++) |
| 726 | request->data_buffer.pfn_array[i] = |
| 727 | page_to_pfn(sg_page((&sgl[i]))); |
| 728 | |
| 729 | } else if (scsi_sglist(scmnd)) { |
| 730 | /* ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); */ |
| 731 | request->data_buffer.offset = |
| 732 | virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
| 733 | request->data_buffer.pfn_array[0] = |
| 734 | virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
| 735 | } |
| 736 | |
| 737 | retry_request: |
| 738 | /* Invokes the vsc to start an IO */ |
| 739 | ret = storvsc_drv_obj->on_io_request(dev, |
| 740 | &cmd_request->request); |
| 741 | if (ret == -1) { |
| 742 | /* no more space */ |
| 743 | |
| 744 | if (cmd_request->bounce_sgl_count) { |
| 745 | /* |
| 746 | * FIXME: We can optimize on writes by just skipping |
| 747 | * this |
| 748 | */ |
| 749 | copy_from_bounce_buffer(scsi_sglist(scmnd), |
| 750 | cmd_request->bounce_sgl, |
| 751 | scsi_sg_count(scmnd)); |
| 752 | destroy_bounce_buffer(cmd_request->bounce_sgl, |
| 753 | cmd_request->bounce_sgl_count); |
| 754 | } |
| 755 | |
| 756 | kmem_cache_free(host_dev->request_pool, cmd_request); |
| 757 | |
| 758 | scmnd->scsi_done = NULL; |
| 759 | scmnd->host_scribble = NULL; |
| 760 | |
| 761 | ret = SCSI_MLQUEUE_DEVICE_BUSY; |
| 762 | } |
| 763 | |
| 764 | return ret; |
| 765 | } |
| 766 | |
| 767 | static DEF_SCSI_QCMD(storvsc_queuecommand) |
| 768 | |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 769 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 770 | /* The one and only one */ |
K. Y. Srinivasan | 2e79505 | 2011-05-10 07:53:52 -0700 | [diff] [blame] | 771 | static struct storvsc_driver g_storvsc_drv; |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 772 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 773 | /* Scsi driver */ |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 774 | static struct scsi_host_template scsi_driver = { |
Greg Kroah-Hartman | ff568d3 | 2009-09-02 08:37:47 -0700 | [diff] [blame] | 775 | .module = THIS_MODULE, |
| 776 | .name = "storvsc_host_t", |
| 777 | .bios_param = storvsc_get_chs, |
| 778 | .queuecommand = storvsc_queuecommand, |
| 779 | .eh_host_reset_handler = storvsc_host_reset_handler, |
| 780 | .slave_alloc = storvsc_device_alloc, |
| 781 | .slave_configure = storvsc_device_configure, |
| 782 | .cmd_per_lun = 1, |
| 783 | /* 64 max_queue * 1 target */ |
Lars Lindley | 0686e4f | 2010-03-11 23:51:23 +0100 | [diff] [blame] | 784 | .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, |
Greg Kroah-Hartman | ff568d3 | 2009-09-02 08:37:47 -0700 | [diff] [blame] | 785 | .this_id = -1, |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 786 | /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
Greg Kroah-Hartman | ff568d3 | 2009-09-02 08:37:47 -0700 | [diff] [blame] | 787 | /* currently 32 */ |
| 788 | .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, |
| 789 | /* |
| 790 | * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge |
| 791 | * into 1 sg element. If set, we must limit the max_segment_size to |
| 792 | * PAGE_SIZE, otherwise we may get 1 sg element that represents |
| 793 | * multiple |
| 794 | */ |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 795 | /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
Greg Kroah-Hartman | ff568d3 | 2009-09-02 08:37:47 -0700 | [diff] [blame] | 796 | .use_clustering = ENABLE_CLUSTERING, |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 797 | /* Make sure we dont get a sg segment crosses a page boundary */ |
Greg Kroah-Hartman | ff568d3 | 2009-09-02 08:37:47 -0700 | [diff] [blame] | 798 | .dma_boundary = PAGE_SIZE-1, |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 799 | }; |
| 800 | |
| 801 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 802 | /* |
K. Y. Srinivasan | f5c7887 | 2011-05-10 07:54:43 -0700 | [diff] [blame^] | 803 | * storvsc_probe - Add a new device for this driver |
| 804 | */ |
| 805 | |
| 806 | static int storvsc_probe(struct hv_device *device) |
| 807 | { |
| 808 | int ret; |
| 809 | struct storvsc_driver *storvsc_drv_obj = |
| 810 | drv_to_stordrv(device->device.driver); |
| 811 | struct Scsi_Host *host; |
| 812 | struct hv_host_device *host_dev; |
| 813 | struct storvsc_device_info device_info; |
| 814 | |
| 815 | if (!storvsc_drv_obj->base.dev_add) |
| 816 | return -1; |
| 817 | |
| 818 | host = scsi_host_alloc(&scsi_driver, |
| 819 | sizeof(struct hv_host_device)); |
| 820 | if (!host) |
| 821 | return -ENOMEM; |
| 822 | |
| 823 | dev_set_drvdata(&device->device, host); |
| 824 | |
| 825 | host_dev = (struct hv_host_device *)host->hostdata; |
| 826 | memset(host_dev, 0, sizeof(struct hv_host_device)); |
| 827 | |
| 828 | host_dev->port = host->host_no; |
| 829 | host_dev->dev = device; |
| 830 | |
| 831 | host_dev->request_pool = |
| 832 | kmem_cache_create(dev_name(&device->device), |
| 833 | sizeof(struct storvsc_cmd_request), 0, |
| 834 | SLAB_HWCACHE_ALIGN, NULL); |
| 835 | |
| 836 | if (!host_dev->request_pool) { |
| 837 | scsi_host_put(host); |
| 838 | return -ENOMEM; |
| 839 | } |
| 840 | |
| 841 | device_info.port_number = host->host_no; |
| 842 | /* Call to the vsc driver to add the device */ |
| 843 | ret = storvsc_drv_obj->base.dev_add(device, (void *)&device_info); |
| 844 | |
| 845 | if (ret != 0) { |
| 846 | kmem_cache_destroy(host_dev->request_pool); |
| 847 | scsi_host_put(host); |
| 848 | return -1; |
| 849 | } |
| 850 | |
| 851 | host_dev->path = device_info.path_id; |
| 852 | host_dev->target = device_info.target_id; |
| 853 | |
| 854 | /* max # of devices per target */ |
| 855 | host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; |
| 856 | /* max # of targets per channel */ |
| 857 | host->max_id = STORVSC_MAX_TARGETS; |
| 858 | /* max # of channels */ |
| 859 | host->max_channel = STORVSC_MAX_CHANNELS - 1; |
| 860 | |
| 861 | /* Register the HBA and start the scsi bus scan */ |
| 862 | ret = scsi_add_host(host, &device->device); |
| 863 | if (ret != 0) { |
| 864 | |
| 865 | storvsc_drv_obj->base.dev_rm(device); |
| 866 | |
| 867 | kmem_cache_destroy(host_dev->request_pool); |
| 868 | scsi_host_put(host); |
| 869 | return -1; |
| 870 | } |
| 871 | |
| 872 | scsi_scan_host(host); |
| 873 | return ret; |
| 874 | } |
| 875 | |
| 876 | /* |
Greg Kroah-Hartman | ff568d3 | 2009-09-02 08:37:47 -0700 | [diff] [blame] | 877 | * storvsc_drv_init - StorVsc driver initialization. |
| 878 | */ |
K. Y. Srinivasan | db08577 | 2011-03-23 10:50:27 -0700 | [diff] [blame] | 879 | static int storvsc_drv_init(void) |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 880 | { |
Greg Kroah-Hartman | ff568d3 | 2009-09-02 08:37:47 -0700 | [diff] [blame] | 881 | int ret; |
K. Y. Srinivasan | 2e79505 | 2011-05-10 07:53:52 -0700 | [diff] [blame] | 882 | struct storvsc_driver *storvsc_drv_obj = &g_storvsc_drv; |
K. Y. Srinivasan | 4af27d7 | 2011-03-07 13:34:01 -0800 | [diff] [blame] | 883 | struct hv_driver *drv = &g_storvsc_drv.base; |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 884 | |
Hank Janssen | 8a04602 | 2010-12-06 12:26:45 -0800 | [diff] [blame] | 885 | storvsc_drv_obj->ring_buffer_size = storvsc_ringbuffer_size; |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 886 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 887 | /* Callback to client driver to complete the initialization */ |
K. Y. Srinivasan | cf6fdfb | 2011-05-10 07:54:36 -0700 | [diff] [blame] | 888 | storvsc_initialize(&storvsc_drv_obj->base); |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 889 | |
Greg Kroah-Hartman | ff568d3 | 2009-09-02 08:37:47 -0700 | [diff] [blame] | 890 | DPRINT_INFO(STORVSC_DRV, |
K. Y. Srinivasan | 1e05d88 | 2011-03-28 09:33:28 -0700 | [diff] [blame] | 891 | "max outstanding reqs %u", |
Hank Janssen | 8a04602 | 2010-12-06 12:26:45 -0800 | [diff] [blame] | 892 | storvsc_drv_obj->max_outstanding_req_per_channel); |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 893 | |
Hank Janssen | 8a04602 | 2010-12-06 12:26:45 -0800 | [diff] [blame] | 894 | if (storvsc_drv_obj->max_outstanding_req_per_channel < |
K. Y. Srinivasan | f8feed0 | 2011-05-10 07:54:24 -0700 | [diff] [blame] | 895 | STORVSC_MAX_IO_REQUESTS) |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 896 | return -1; |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 897 | |
K. Y. Srinivasan | 150f939 | 2011-03-07 13:32:31 -0800 | [diff] [blame] | 898 | drv->driver.name = storvsc_drv_obj->base.name; |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 899 | |
K. Y. Srinivasan | 9efd21e | 2011-04-29 13:45:10 -0700 | [diff] [blame] | 900 | drv->probe = storvsc_probe; |
K. Y. Srinivasan | 415b023 | 2011-04-29 13:45:12 -0700 | [diff] [blame] | 901 | drv->remove = storvsc_remove; |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 902 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 903 | /* The driver belongs to vmbus */ |
K. Y. Srinivasan | 150f939 | 2011-03-07 13:32:31 -0800 | [diff] [blame] | 904 | ret = vmbus_child_driver_register(&drv->driver); |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 905 | |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 906 | return ret; |
| 907 | } |
| 908 | |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 909 | static int storvsc_drv_exit_cb(struct device *dev, void *data) |
| 910 | { |
| 911 | struct device **curr = (struct device **)data; |
| 912 | *curr = dev; |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 913 | return 1; /* stop iterating */ |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 914 | } |
| 915 | |
Greg Kroah-Hartman | bd1de70 | 2009-07-29 09:04:51 -0700 | [diff] [blame] | 916 | static void storvsc_drv_exit(void) |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 917 | { |
K. Y. Srinivasan | 2e79505 | 2011-05-10 07:53:52 -0700 | [diff] [blame] | 918 | struct storvsc_driver *storvsc_drv_obj = &g_storvsc_drv; |
K. Y. Srinivasan | 4af27d7 | 2011-03-07 13:34:01 -0800 | [diff] [blame] | 919 | struct hv_driver *drv = &g_storvsc_drv.base; |
Greg Kroah-Hartman | ff568d3 | 2009-09-02 08:37:47 -0700 | [diff] [blame] | 920 | struct device *current_dev = NULL; |
Bill Pemberton | 2295ba2 | 2009-07-28 13:46:22 -0400 | [diff] [blame] | 921 | int ret; |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 922 | |
Greg Kroah-Hartman | ff568d3 | 2009-09-02 08:37:47 -0700 | [diff] [blame] | 923 | while (1) { |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 924 | current_dev = NULL; |
| 925 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 926 | /* Get the device */ |
K. Y. Srinivasan | 150f939 | 2011-03-07 13:32:31 -0800 | [diff] [blame] | 927 | ret = driver_for_each_device(&drv->driver, NULL, |
Bill Pemberton | 2295ba2 | 2009-07-28 13:46:22 -0400 | [diff] [blame] | 928 | (void *) ¤t_dev, |
| 929 | storvsc_drv_exit_cb); |
| 930 | |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 931 | |
| 932 | if (current_dev == NULL) |
| 933 | break; |
| 934 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 935 | /* Initiate removal from the top-down */ |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 936 | device_unregister(current_dev); |
| 937 | } |
| 938 | |
Haiyang Zhang | ca623ad | 2011-01-26 12:12:11 -0800 | [diff] [blame] | 939 | if (storvsc_drv_obj->base.cleanup) |
| 940 | storvsc_drv_obj->base.cleanup(&storvsc_drv_obj->base); |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 941 | |
K. Y. Srinivasan | 150f939 | 2011-03-07 13:32:31 -0800 | [diff] [blame] | 942 | vmbus_child_driver_unregister(&drv->driver); |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 943 | return; |
| 944 | } |
| 945 | |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 946 | static int __init storvsc_init(void) |
| 947 | { |
| 948 | int ret; |
| 949 | |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 950 | DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); |
K. Y. Srinivasan | db08577 | 2011-03-23 10:50:27 -0700 | [diff] [blame] | 951 | ret = storvsc_drv_init(); |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 952 | return ret; |
| 953 | } |
| 954 | |
| 955 | static void __exit storvsc_exit(void) |
| 956 | { |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 957 | storvsc_drv_exit(); |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 958 | } |
| 959 | |
Greg Kroah-Hartman | ff568d3 | 2009-09-02 08:37:47 -0700 | [diff] [blame] | 960 | MODULE_LICENSE("GPL"); |
Hank Janssen | 26c14cc | 2010-02-11 23:02:42 +0000 | [diff] [blame] | 961 | MODULE_VERSION(HV_DRV_VERSION); |
Stephen Hemminger | 3afc7cc3 | 2010-05-06 21:44:45 -0700 | [diff] [blame] | 962 | MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
Hank Janssen | bef4a34 | 2009-07-13 16:01:31 -0700 | [diff] [blame] | 963 | module_init(storvsc_init); |
| 964 | module_exit(storvsc_exit); |