| 1 | /* ------------------------------------------------------------ |
| 2 | * ibmvscsi.c |
| 3 | * (C) Copyright IBM Corporation 1994, 2004 |
| 4 | * Authors: Colin DeVilbiss (devilbis@us.ibm.com) |
| 5 | * Santiago Leon (santil@us.ibm.com) |
| 6 | * Dave Boutcher (sleddog@us.ibm.com) |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 21 | * USA |
| 22 | * |
| 23 | * ------------------------------------------------------------ |
| 24 | * Emulation of a SCSI host adapter for Virtual I/O devices |
| 25 | * |
| 26 | * This driver supports the SCSI adapter implemented by the IBM |
| 27 | * Power5 firmware. That SCSI adapter is not a physical adapter, |
| 28 | * but allows Linux SCSI peripheral drivers to directly |
| 29 | * access devices in another logical partition on the physical system. |
| 30 | * |
| 31 | * The virtual adapter(s) are present in the open firmware device |
| 32 | * tree just like real adapters. |
| 33 | * |
| 34 | * One of the capabilities provided on these systems is the ability |
| 35 | * to DMA between partitions. The architecture states that for VSCSI, |
| 36 | * the server side is allowed to DMA to and from the client. The client |
| 37 | * is never trusted to DMA to or from the server directly. |
| 38 | * |
| 39 | * Messages are sent between partitions on a "Command/Response Queue" |
| 40 | * (CRQ), which is just a buffer of 16 byte entries in the receiver's |
| 41 | * Senders cannot access the buffer directly, but send messages by |
| 42 | * making a hypervisor call and passing in the 16 bytes. The hypervisor |
| 43 | * puts the message in the next 16 byte space in round-robbin fashion, |
| 44 | * turns on the high order bit of the message (the valid bit), and |
| 45 | * generates an interrupt to the receiver (if interrupts are turned on.) |
| 46 | * The receiver just turns off the valid bit when they have copied out |
| 47 | * the message. |
| 48 | * |
| 49 | * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit |
| 50 | * (IU) (as defined in the T10 standard available at www.t10.org), gets |
| 51 | * a DMA address for the message, and sends it to the server as the |
| 52 | * payload of a CRQ message. The server DMAs the SRP IU and processes it, |
| 53 | * including doing any additional data transfers. When it is done, it |
| 54 | * DMAs the SRP response back to the same address as the request came from, |
| 55 | * and sends a CRQ message back to inform the client that the request has |
| 56 | * completed. |
| 57 | * |
| 58 | * Note that some of the underlying infrastructure is different between |
| 59 | * machines conforming to the "RS/6000 Platform Architecture" (RPA) and |
| 60 | * the older iSeries hypervisor models. To support both, some low level |
| 61 | * routines have been broken out into rpa_vscsi.c and iseries_vscsi.c. |
| 62 | * The Makefile should pick one, not two, not zero, of these. |
| 63 | * |
| 64 | * TODO: This is currently pretty tied to the IBM i/pSeries hypervisor |
| 65 | * interfaces. It would be really nice to abstract this above an RDMA |
| 66 | * layer. |
| 67 | */ |
| 68 | |
| 69 | #include <linux/module.h> |
| 70 | #include <linux/moduleparam.h> |
| 71 | #include <linux/dma-mapping.h> |
| 72 | #include <linux/delay.h> |
| 73 | #include <linux/of.h> |
| 74 | #include <asm/firmware.h> |
| 75 | #include <asm/vio.h> |
| 76 | #include <scsi/scsi.h> |
| 77 | #include <scsi/scsi_cmnd.h> |
| 78 | #include <scsi/scsi_host.h> |
| 79 | #include <scsi/scsi_device.h> |
| 80 | #include <scsi/scsi_transport_srp.h> |
| 81 | #include "ibmvscsi.h" |
| 82 | |
| 83 | /* The values below are somewhat arbitrary default values, but |
| 84 | * OS/400 will use 3 busses (disks, CDs, tapes, I think.) |
| 85 | * Note that there are 3 bits of channel value, 6 bits of id, and |
| 86 | * 5 bits of LUN. |
| 87 | */ |
| 88 | static int max_id = 64; |
| 89 | static int max_channel = 3; |
| 90 | static int init_timeout = 300; |
| 91 | static int login_timeout = 60; |
| 92 | static int info_timeout = 30; |
| 93 | static int abort_timeout = 60; |
| 94 | static int reset_timeout = 60; |
| 95 | static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT; |
| 96 | static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2; |
| 97 | static int fast_fail = 1; |
| 98 | static int client_reserve = 1; |
| 99 | |
| 100 | static struct scsi_transport_template *ibmvscsi_transport_template; |
| 101 | |
| 102 | #define IBMVSCSI_VERSION "1.5.8" |
| 103 | |
| 104 | static struct ibmvscsi_ops *ibmvscsi_ops; |
| 105 | |
| 106 | MODULE_DESCRIPTION("IBM Virtual SCSI"); |
| 107 | MODULE_AUTHOR("Dave Boutcher"); |
| 108 | MODULE_LICENSE("GPL"); |
| 109 | MODULE_VERSION(IBMVSCSI_VERSION); |
| 110 | |
| 111 | module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR); |
| 112 | MODULE_PARM_DESC(max_id, "Largest ID value for each channel"); |
| 113 | module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); |
| 114 | MODULE_PARM_DESC(max_channel, "Largest channel value"); |
| 115 | module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR); |
| 116 | MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds"); |
| 117 | module_param_named(max_requests, max_requests, int, S_IRUGO); |
| 118 | MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter"); |
| 119 | module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR); |
| 120 | MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]"); |
| 121 | module_param_named(client_reserve, client_reserve, int, S_IRUGO ); |
| 122 | MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release"); |
| 123 | |
| 124 | /* ------------------------------------------------------------ |
| 125 | * Routines for the event pool and event structs |
| 126 | */ |
| 127 | /** |
| 128 | * initialize_event_pool: - Allocates and initializes the event pool for a host |
| 129 | * @pool: event_pool to be initialized |
| 130 | * @size: Number of events in pool |
| 131 | * @hostdata: ibmvscsi_host_data who owns the event pool |
| 132 | * |
| 133 | * Returns zero on success. |
| 134 | */ |
| 135 | static int initialize_event_pool(struct event_pool *pool, |
| 136 | int size, struct ibmvscsi_host_data *hostdata) |
| 137 | { |
| 138 | int i; |
| 139 | |
| 140 | pool->size = size; |
| 141 | pool->next = 0; |
| 142 | pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); |
| 143 | if (!pool->events) |
| 144 | return -ENOMEM; |
| 145 | |
| 146 | pool->iu_storage = |
| 147 | dma_alloc_coherent(hostdata->dev, |
| 148 | pool->size * sizeof(*pool->iu_storage), |
| 149 | &pool->iu_token, 0); |
| 150 | if (!pool->iu_storage) { |
| 151 | kfree(pool->events); |
| 152 | return -ENOMEM; |
| 153 | } |
| 154 | |
| 155 | for (i = 0; i < pool->size; ++i) { |
| 156 | struct srp_event_struct *evt = &pool->events[i]; |
| 157 | memset(&evt->crq, 0x00, sizeof(evt->crq)); |
| 158 | atomic_set(&evt->free, 1); |
| 159 | evt->crq.valid = 0x80; |
| 160 | evt->crq.IU_length = sizeof(*evt->xfer_iu); |
| 161 | evt->crq.IU_data_ptr = pool->iu_token + |
| 162 | sizeof(*evt->xfer_iu) * i; |
| 163 | evt->xfer_iu = pool->iu_storage + i; |
| 164 | evt->hostdata = hostdata; |
| 165 | evt->ext_list = NULL; |
| 166 | evt->ext_list_token = 0; |
| 167 | } |
| 168 | |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * release_event_pool: - Frees memory of an event pool of a host |
| 174 | * @pool: event_pool to be released |
| 175 | * @hostdata: ibmvscsi_host_data who owns the even pool |
| 176 | * |
| 177 | * Returns zero on success. |
| 178 | */ |
| 179 | static void release_event_pool(struct event_pool *pool, |
| 180 | struct ibmvscsi_host_data *hostdata) |
| 181 | { |
| 182 | int i, in_use = 0; |
| 183 | for (i = 0; i < pool->size; ++i) { |
| 184 | if (atomic_read(&pool->events[i].free) != 1) |
| 185 | ++in_use; |
| 186 | if (pool->events[i].ext_list) { |
| 187 | dma_free_coherent(hostdata->dev, |
| 188 | SG_ALL * sizeof(struct srp_direct_buf), |
| 189 | pool->events[i].ext_list, |
| 190 | pool->events[i].ext_list_token); |
| 191 | } |
| 192 | } |
| 193 | if (in_use) |
| 194 | dev_warn(hostdata->dev, "releasing event pool with %d " |
| 195 | "events still in use?\n", in_use); |
| 196 | kfree(pool->events); |
| 197 | dma_free_coherent(hostdata->dev, |
| 198 | pool->size * sizeof(*pool->iu_storage), |
| 199 | pool->iu_storage, pool->iu_token); |
| 200 | } |
| 201 | |
| 202 | /** |
| 203 | * valid_event_struct: - Determines if event is valid. |
| 204 | * @pool: event_pool that contains the event |
| 205 | * @evt: srp_event_struct to be checked for validity |
| 206 | * |
| 207 | * Returns zero if event is invalid, one otherwise. |
| 208 | */ |
| 209 | static int valid_event_struct(struct event_pool *pool, |
| 210 | struct srp_event_struct *evt) |
| 211 | { |
| 212 | int index = evt - pool->events; |
| 213 | if (index < 0 || index >= pool->size) /* outside of bounds */ |
| 214 | return 0; |
| 215 | if (evt != pool->events + index) /* unaligned */ |
| 216 | return 0; |
| 217 | return 1; |
| 218 | } |
| 219 | |
| 220 | /** |
| 221 | * ibmvscsi_free-event_struct: - Changes status of event to "free" |
| 222 | * @pool: event_pool that contains the event |
| 223 | * @evt: srp_event_struct to be modified |
| 224 | * |
| 225 | */ |
| 226 | static void free_event_struct(struct event_pool *pool, |
| 227 | struct srp_event_struct *evt) |
| 228 | { |
| 229 | if (!valid_event_struct(pool, evt)) { |
| 230 | dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p " |
| 231 | "(not in pool %p)\n", evt, pool->events); |
| 232 | return; |
| 233 | } |
| 234 | if (atomic_inc_return(&evt->free) != 1) { |
| 235 | dev_err(evt->hostdata->dev, "Freeing event_struct %p " |
| 236 | "which is not in use!\n", evt); |
| 237 | return; |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * get_evt_struct: - Gets the next free event in pool |
| 243 | * @pool: event_pool that contains the events to be searched |
| 244 | * |
| 245 | * Returns the next event in "free" state, and NULL if none are free. |
| 246 | * Note that no synchronization is done here, we assume the host_lock |
| 247 | * will syncrhonze things. |
| 248 | */ |
| 249 | static struct srp_event_struct *get_event_struct(struct event_pool *pool) |
| 250 | { |
| 251 | int i; |
| 252 | int poolsize = pool->size; |
| 253 | int offset = pool->next; |
| 254 | |
| 255 | for (i = 0; i < poolsize; i++) { |
| 256 | offset = (offset + 1) % poolsize; |
| 257 | if (!atomic_dec_if_positive(&pool->events[offset].free)) { |
| 258 | pool->next = offset; |
| 259 | return &pool->events[offset]; |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); |
| 264 | return NULL; |
| 265 | } |
| 266 | |
| 267 | /** |
| 268 | * init_event_struct: Initialize fields in an event struct that are always |
| 269 | * required. |
| 270 | * @evt: The event |
| 271 | * @done: Routine to call when the event is responded to |
| 272 | * @format: SRP or MAD format |
| 273 | * @timeout: timeout value set in the CRQ |
| 274 | */ |
| 275 | static void init_event_struct(struct srp_event_struct *evt_struct, |
| 276 | void (*done) (struct srp_event_struct *), |
| 277 | u8 format, |
| 278 | int timeout) |
| 279 | { |
| 280 | evt_struct->cmnd = NULL; |
| 281 | evt_struct->cmnd_done = NULL; |
| 282 | evt_struct->sync_srp = NULL; |
| 283 | evt_struct->crq.format = format; |
| 284 | evt_struct->crq.timeout = timeout; |
| 285 | evt_struct->done = done; |
| 286 | } |
| 287 | |
| 288 | /* ------------------------------------------------------------ |
| 289 | * Routines for receiving SCSI responses from the hosting partition |
| 290 | */ |
| 291 | |
| 292 | /** |
| 293 | * set_srp_direction: Set the fields in the srp related to data |
| 294 | * direction and number of buffers based on the direction in |
| 295 | * the scsi_cmnd and the number of buffers |
| 296 | */ |
| 297 | static void set_srp_direction(struct scsi_cmnd *cmd, |
| 298 | struct srp_cmd *srp_cmd, |
| 299 | int numbuf) |
| 300 | { |
| 301 | u8 fmt; |
| 302 | |
| 303 | if (numbuf == 0) |
| 304 | return; |
| 305 | |
| 306 | if (numbuf == 1) |
| 307 | fmt = SRP_DATA_DESC_DIRECT; |
| 308 | else { |
| 309 | fmt = SRP_DATA_DESC_INDIRECT; |
| 310 | numbuf = min(numbuf, MAX_INDIRECT_BUFS); |
| 311 | |
| 312 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
| 313 | srp_cmd->data_out_desc_cnt = numbuf; |
| 314 | else |
| 315 | srp_cmd->data_in_desc_cnt = numbuf; |
| 316 | } |
| 317 | |
| 318 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
| 319 | srp_cmd->buf_fmt = fmt << 4; |
| 320 | else |
| 321 | srp_cmd->buf_fmt = fmt; |
| 322 | } |
| 323 | |
| 324 | static void unmap_sg_list(int num_entries, |
| 325 | struct device *dev, |
| 326 | struct srp_direct_buf *md) |
| 327 | { |
| 328 | int i; |
| 329 | |
| 330 | for (i = 0; i < num_entries; ++i) |
| 331 | dma_unmap_single(dev, md[i].va, md[i].len, DMA_BIDIRECTIONAL); |
| 332 | } |
| 333 | |
| 334 | /** |
| 335 | * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format |
| 336 | * @cmd: srp_cmd whose additional_data member will be unmapped |
| 337 | * @dev: device for which the memory is mapped |
| 338 | * |
| 339 | */ |
| 340 | static void unmap_cmd_data(struct srp_cmd *cmd, |
| 341 | struct srp_event_struct *evt_struct, |
| 342 | struct device *dev) |
| 343 | { |
| 344 | u8 out_fmt, in_fmt; |
| 345 | |
| 346 | out_fmt = cmd->buf_fmt >> 4; |
| 347 | in_fmt = cmd->buf_fmt & ((1U << 4) - 1); |
| 348 | |
| 349 | if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) |
| 350 | return; |
| 351 | else if (out_fmt == SRP_DATA_DESC_DIRECT || |
| 352 | in_fmt == SRP_DATA_DESC_DIRECT) { |
| 353 | struct srp_direct_buf *data = |
| 354 | (struct srp_direct_buf *) cmd->add_data; |
| 355 | dma_unmap_single(dev, data->va, data->len, DMA_BIDIRECTIONAL); |
| 356 | } else { |
| 357 | struct srp_indirect_buf *indirect = |
| 358 | (struct srp_indirect_buf *) cmd->add_data; |
| 359 | int num_mapped = indirect->table_desc.len / |
| 360 | sizeof(struct srp_direct_buf); |
| 361 | |
| 362 | if (num_mapped <= MAX_INDIRECT_BUFS) { |
| 363 | unmap_sg_list(num_mapped, dev, &indirect->desc_list[0]); |
| 364 | return; |
| 365 | } |
| 366 | |
| 367 | unmap_sg_list(num_mapped, dev, evt_struct->ext_list); |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | static int map_sg_list(struct scsi_cmnd *cmd, int nseg, |
| 372 | struct srp_direct_buf *md) |
| 373 | { |
| 374 | int i; |
| 375 | struct scatterlist *sg; |
| 376 | u64 total_length = 0; |
| 377 | |
| 378 | scsi_for_each_sg(cmd, sg, nseg, i) { |
| 379 | struct srp_direct_buf *descr = md + i; |
| 380 | descr->va = sg_dma_address(sg); |
| 381 | descr->len = sg_dma_len(sg); |
| 382 | descr->key = 0; |
| 383 | total_length += sg_dma_len(sg); |
| 384 | } |
| 385 | return total_length; |
| 386 | } |
| 387 | |
| 388 | /** |
| 389 | * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields |
| 390 | * @cmd: Scsi_Cmnd with the scatterlist |
| 391 | * @srp_cmd: srp_cmd that contains the memory descriptor |
| 392 | * @dev: device for which to map dma memory |
| 393 | * |
| 394 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. |
| 395 | * Returns 1 on success. |
| 396 | */ |
| 397 | static int map_sg_data(struct scsi_cmnd *cmd, |
| 398 | struct srp_event_struct *evt_struct, |
| 399 | struct srp_cmd *srp_cmd, struct device *dev) |
| 400 | { |
| 401 | |
| 402 | int sg_mapped; |
| 403 | u64 total_length = 0; |
| 404 | struct srp_direct_buf *data = |
| 405 | (struct srp_direct_buf *) srp_cmd->add_data; |
| 406 | struct srp_indirect_buf *indirect = |
| 407 | (struct srp_indirect_buf *) data; |
| 408 | |
| 409 | sg_mapped = scsi_dma_map(cmd); |
| 410 | if (!sg_mapped) |
| 411 | return 1; |
| 412 | else if (sg_mapped < 0) |
| 413 | return 0; |
| 414 | |
| 415 | set_srp_direction(cmd, srp_cmd, sg_mapped); |
| 416 | |
| 417 | /* special case; we can use a single direct descriptor */ |
| 418 | if (sg_mapped == 1) { |
| 419 | map_sg_list(cmd, sg_mapped, data); |
| 420 | return 1; |
| 421 | } |
| 422 | |
| 423 | indirect->table_desc.va = 0; |
| 424 | indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf); |
| 425 | indirect->table_desc.key = 0; |
| 426 | |
| 427 | if (sg_mapped <= MAX_INDIRECT_BUFS) { |
| 428 | total_length = map_sg_list(cmd, sg_mapped, |
| 429 | &indirect->desc_list[0]); |
| 430 | indirect->len = total_length; |
| 431 | return 1; |
| 432 | } |
| 433 | |
| 434 | /* get indirect table */ |
| 435 | if (!evt_struct->ext_list) { |
| 436 | evt_struct->ext_list = (struct srp_direct_buf *) |
| 437 | dma_alloc_coherent(dev, |
| 438 | SG_ALL * sizeof(struct srp_direct_buf), |
| 439 | &evt_struct->ext_list_token, 0); |
| 440 | if (!evt_struct->ext_list) { |
| 441 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
| 442 | sdev_printk(KERN_ERR, cmd->device, |
| 443 | "Can't allocate memory " |
| 444 | "for indirect table\n"); |
| 445 | scsi_dma_unmap(cmd); |
| 446 | return 0; |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list); |
| 451 | |
| 452 | indirect->len = total_length; |
| 453 | indirect->table_desc.va = evt_struct->ext_list_token; |
| 454 | indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]); |
| 455 | memcpy(indirect->desc_list, evt_struct->ext_list, |
| 456 | MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); |
| 457 | return 1; |
| 458 | } |
| 459 | |
| 460 | /** |
| 461 | * map_data_for_srp_cmd: - Calls functions to map data for srp cmds |
| 462 | * @cmd: struct scsi_cmnd with the memory to be mapped |
| 463 | * @srp_cmd: srp_cmd that contains the memory descriptor |
| 464 | * @dev: dma device for which to map dma memory |
| 465 | * |
| 466 | * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds |
| 467 | * Returns 1 on success. |
| 468 | */ |
| 469 | static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, |
| 470 | struct srp_event_struct *evt_struct, |
| 471 | struct srp_cmd *srp_cmd, struct device *dev) |
| 472 | { |
| 473 | switch (cmd->sc_data_direction) { |
| 474 | case DMA_FROM_DEVICE: |
| 475 | case DMA_TO_DEVICE: |
| 476 | break; |
| 477 | case DMA_NONE: |
| 478 | return 1; |
| 479 | case DMA_BIDIRECTIONAL: |
| 480 | sdev_printk(KERN_ERR, cmd->device, |
| 481 | "Can't map DMA_BIDIRECTIONAL to read/write\n"); |
| 482 | return 0; |
| 483 | default: |
| 484 | sdev_printk(KERN_ERR, cmd->device, |
| 485 | "Unknown data direction 0x%02x; can't map!\n", |
| 486 | cmd->sc_data_direction); |
| 487 | return 0; |
| 488 | } |
| 489 | |
| 490 | return map_sg_data(cmd, evt_struct, srp_cmd, dev); |
| 491 | } |
| 492 | |
| 493 | /** |
| 494 | * purge_requests: Our virtual adapter just shut down. purge any sent requests |
| 495 | * @hostdata: the adapter |
| 496 | */ |
| 497 | static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) |
| 498 | { |
| 499 | struct srp_event_struct *tmp_evt, *pos; |
| 500 | unsigned long flags; |
| 501 | |
| 502 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
| 503 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
| 504 | list_del(&tmp_evt->list); |
| 505 | del_timer(&tmp_evt->timer); |
| 506 | if (tmp_evt->cmnd) { |
| 507 | tmp_evt->cmnd->result = (error_code << 16); |
| 508 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, |
| 509 | tmp_evt, |
| 510 | tmp_evt->hostdata->dev); |
| 511 | if (tmp_evt->cmnd_done) |
| 512 | tmp_evt->cmnd_done(tmp_evt->cmnd); |
| 513 | } else if (tmp_evt->done) |
| 514 | tmp_evt->done(tmp_evt); |
| 515 | free_event_struct(&tmp_evt->hostdata->pool, tmp_evt); |
| 516 | } |
| 517 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 518 | } |
| 519 | |
| 520 | /** |
| 521 | * ibmvscsi_reset_host - Reset the connection to the server |
| 522 | * @hostdata: struct ibmvscsi_host_data to reset |
| 523 | */ |
| 524 | static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata) |
| 525 | { |
| 526 | scsi_block_requests(hostdata->host); |
| 527 | atomic_set(&hostdata->request_limit, 0); |
| 528 | |
| 529 | purge_requests(hostdata, DID_ERROR); |
| 530 | if ((ibmvscsi_ops->reset_crq_queue(&hostdata->queue, hostdata)) || |
| 531 | (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0)) || |
| 532 | (vio_enable_interrupts(to_vio_dev(hostdata->dev)))) { |
| 533 | atomic_set(&hostdata->request_limit, -1); |
| 534 | dev_err(hostdata->dev, "error after reset\n"); |
| 535 | } |
| 536 | |
| 537 | scsi_unblock_requests(hostdata->host); |
| 538 | } |
| 539 | |
| 540 | /** |
| 541 | * ibmvscsi_timeout - Internal command timeout handler |
| 542 | * @evt_struct: struct srp_event_struct that timed out |
| 543 | * |
| 544 | * Called when an internally generated command times out |
| 545 | */ |
| 546 | static void ibmvscsi_timeout(struct srp_event_struct *evt_struct) |
| 547 | { |
| 548 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; |
| 549 | |
| 550 | dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n", |
| 551 | evt_struct->iu.srp.cmd.opcode); |
| 552 | |
| 553 | ibmvscsi_reset_host(hostdata); |
| 554 | } |
| 555 | |
| 556 | |
| 557 | /* ------------------------------------------------------------ |
| 558 | * Routines for sending and receiving SRPs |
| 559 | */ |
| 560 | /** |
| 561 | * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() |
| 562 | * @evt_struct: evt_struct to be sent |
| 563 | * @hostdata: ibmvscsi_host_data of host |
| 564 | * @timeout: timeout in seconds - 0 means do not time command |
| 565 | * |
| 566 | * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) |
| 567 | * Note that this routine assumes that host_lock is held for synchronization |
| 568 | */ |
| 569 | static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, |
| 570 | struct ibmvscsi_host_data *hostdata, |
| 571 | unsigned long timeout) |
| 572 | { |
| 573 | u64 *crq_as_u64 = (u64 *) &evt_struct->crq; |
| 574 | int request_status = 0; |
| 575 | int rc; |
| 576 | |
| 577 | /* If we have exhausted our request limit, just fail this request, |
| 578 | * unless it is for a reset or abort. |
| 579 | * Note that there are rare cases involving driver generated requests |
| 580 | * (such as task management requests) that the mid layer may think we |
| 581 | * can handle more requests (can_queue) when we actually can't |
| 582 | */ |
| 583 | if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) { |
| 584 | request_status = |
| 585 | atomic_dec_if_positive(&hostdata->request_limit); |
| 586 | /* If request limit was -1 when we started, it is now even |
| 587 | * less than that |
| 588 | */ |
| 589 | if (request_status < -1) |
| 590 | goto send_error; |
| 591 | /* Otherwise, we may have run out of requests. */ |
| 592 | /* If request limit was 0 when we started the adapter is in the |
| 593 | * process of performing a login with the server adapter, or |
| 594 | * we may have run out of requests. |
| 595 | */ |
| 596 | else if (request_status == -1 && |
| 597 | evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ) |
| 598 | goto send_busy; |
| 599 | /* Abort and reset calls should make it through. |
| 600 | * Nothing except abort and reset should use the last two |
| 601 | * slots unless we had two or less to begin with. |
| 602 | */ |
| 603 | else if (request_status < 2 && |
| 604 | evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) { |
| 605 | /* In the case that we have less than two requests |
| 606 | * available, check the server limit as a combination |
| 607 | * of the request limit and the number of requests |
| 608 | * in-flight (the size of the send list). If the |
| 609 | * server limit is greater than 2, return busy so |
| 610 | * that the last two are reserved for reset and abort. |
| 611 | */ |
| 612 | int server_limit = request_status; |
| 613 | struct srp_event_struct *tmp_evt; |
| 614 | |
| 615 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { |
| 616 | server_limit++; |
| 617 | } |
| 618 | |
| 619 | if (server_limit > 2) |
| 620 | goto send_busy; |
| 621 | } |
| 622 | } |
| 623 | |
| 624 | /* Copy the IU into the transfer area */ |
| 625 | *evt_struct->xfer_iu = evt_struct->iu; |
| 626 | evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; |
| 627 | |
| 628 | /* Add this to the sent list. We need to do this |
| 629 | * before we actually send |
| 630 | * in case it comes back REALLY fast |
| 631 | */ |
| 632 | list_add_tail(&evt_struct->list, &hostdata->sent); |
| 633 | |
| 634 | init_timer(&evt_struct->timer); |
| 635 | if (timeout) { |
| 636 | evt_struct->timer.data = (unsigned long) evt_struct; |
| 637 | evt_struct->timer.expires = jiffies + (timeout * HZ); |
| 638 | evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout; |
| 639 | add_timer(&evt_struct->timer); |
| 640 | } |
| 641 | |
| 642 | if ((rc = |
| 643 | ibmvscsi_ops->send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) { |
| 644 | list_del(&evt_struct->list); |
| 645 | del_timer(&evt_struct->timer); |
| 646 | |
| 647 | /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. |
| 648 | * Firmware will send a CRQ with a transport event (0xFF) to |
| 649 | * tell this client what has happened to the transport. This |
| 650 | * will be handled in ibmvscsi_handle_crq() |
| 651 | */ |
| 652 | if (rc == H_CLOSED) { |
| 653 | dev_warn(hostdata->dev, "send warning. " |
| 654 | "Receive queue closed, will retry.\n"); |
| 655 | goto send_busy; |
| 656 | } |
| 657 | dev_err(hostdata->dev, "send error %d\n", rc); |
| 658 | atomic_inc(&hostdata->request_limit); |
| 659 | goto send_error; |
| 660 | } |
| 661 | |
| 662 | return 0; |
| 663 | |
| 664 | send_busy: |
| 665 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
| 666 | |
| 667 | free_event_struct(&hostdata->pool, evt_struct); |
| 668 | if (request_status != -1) |
| 669 | atomic_inc(&hostdata->request_limit); |
| 670 | return SCSI_MLQUEUE_HOST_BUSY; |
| 671 | |
| 672 | send_error: |
| 673 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
| 674 | |
| 675 | if (evt_struct->cmnd != NULL) { |
| 676 | evt_struct->cmnd->result = DID_ERROR << 16; |
| 677 | evt_struct->cmnd_done(evt_struct->cmnd); |
| 678 | } else if (evt_struct->done) |
| 679 | evt_struct->done(evt_struct); |
| 680 | |
| 681 | free_event_struct(&hostdata->pool, evt_struct); |
| 682 | return 0; |
| 683 | } |
| 684 | |
| 685 | /** |
| 686 | * handle_cmd_rsp: - Handle responses from commands |
| 687 | * @evt_struct: srp_event_struct to be handled |
| 688 | * |
| 689 | * Used as a callback by when sending scsi cmds. |
| 690 | * Gets called by ibmvscsi_handle_crq() |
| 691 | */ |
| 692 | static void handle_cmd_rsp(struct srp_event_struct *evt_struct) |
| 693 | { |
| 694 | struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; |
| 695 | struct scsi_cmnd *cmnd = evt_struct->cmnd; |
| 696 | |
| 697 | if (unlikely(rsp->opcode != SRP_RSP)) { |
| 698 | if (printk_ratelimit()) |
| 699 | dev_warn(evt_struct->hostdata->dev, |
| 700 | "bad SRP RSP type %d\n", rsp->opcode); |
| 701 | } |
| 702 | |
| 703 | if (cmnd) { |
| 704 | cmnd->result |= rsp->status; |
| 705 | if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) |
| 706 | memcpy(cmnd->sense_buffer, |
| 707 | rsp->data, |
| 708 | rsp->sense_data_len); |
| 709 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
| 710 | evt_struct, |
| 711 | evt_struct->hostdata->dev); |
| 712 | |
| 713 | if (rsp->flags & SRP_RSP_FLAG_DOOVER) |
| 714 | scsi_set_resid(cmnd, rsp->data_out_res_cnt); |
| 715 | else if (rsp->flags & SRP_RSP_FLAG_DIOVER) |
| 716 | scsi_set_resid(cmnd, rsp->data_in_res_cnt); |
| 717 | } |
| 718 | |
| 719 | if (evt_struct->cmnd_done) |
| 720 | evt_struct->cmnd_done(cmnd); |
| 721 | } |
| 722 | |
| 723 | /** |
| 724 | * lun_from_dev: - Returns the lun of the scsi device |
| 725 | * @dev: struct scsi_device |
| 726 | * |
| 727 | */ |
| 728 | static inline u16 lun_from_dev(struct scsi_device *dev) |
| 729 | { |
| 730 | return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; |
| 731 | } |
| 732 | |
| 733 | /** |
| 734 | * ibmvscsi_queue: - The queuecommand function of the scsi template |
| 735 | * @cmd: struct scsi_cmnd to be executed |
| 736 | * @done: Callback function to be called when cmd is completed |
| 737 | */ |
| 738 | static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd, |
| 739 | void (*done) (struct scsi_cmnd *)) |
| 740 | { |
| 741 | struct srp_cmd *srp_cmd; |
| 742 | struct srp_event_struct *evt_struct; |
| 743 | struct srp_indirect_buf *indirect; |
| 744 | struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host); |
| 745 | u16 lun = lun_from_dev(cmnd->device); |
| 746 | u8 out_fmt, in_fmt; |
| 747 | |
| 748 | cmnd->result = (DID_OK << 16); |
| 749 | evt_struct = get_event_struct(&hostdata->pool); |
| 750 | if (!evt_struct) |
| 751 | return SCSI_MLQUEUE_HOST_BUSY; |
| 752 | |
| 753 | /* Set up the actual SRP IU */ |
| 754 | srp_cmd = &evt_struct->iu.srp.cmd; |
| 755 | memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); |
| 756 | srp_cmd->opcode = SRP_CMD; |
| 757 | memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb)); |
| 758 | srp_cmd->lun = ((u64) lun) << 48; |
| 759 | |
| 760 | if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { |
| 761 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
| 762 | sdev_printk(KERN_ERR, cmnd->device, |
| 763 | "couldn't convert cmd to srp_cmd\n"); |
| 764 | free_event_struct(&hostdata->pool, evt_struct); |
| 765 | return SCSI_MLQUEUE_HOST_BUSY; |
| 766 | } |
| 767 | |
| 768 | init_event_struct(evt_struct, |
| 769 | handle_cmd_rsp, |
| 770 | VIOSRP_SRP_FORMAT, |
| 771 | cmnd->request->timeout/HZ); |
| 772 | |
| 773 | evt_struct->cmnd = cmnd; |
| 774 | evt_struct->cmnd_done = done; |
| 775 | |
| 776 | /* Fix up dma address of the buffer itself */ |
| 777 | indirect = (struct srp_indirect_buf *) srp_cmd->add_data; |
| 778 | out_fmt = srp_cmd->buf_fmt >> 4; |
| 779 | in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); |
| 780 | if ((in_fmt == SRP_DATA_DESC_INDIRECT || |
| 781 | out_fmt == SRP_DATA_DESC_INDIRECT) && |
| 782 | indirect->table_desc.va == 0) { |
| 783 | indirect->table_desc.va = evt_struct->crq.IU_data_ptr + |
| 784 | offsetof(struct srp_cmd, add_data) + |
| 785 | offsetof(struct srp_indirect_buf, desc_list); |
| 786 | } |
| 787 | |
| 788 | return ibmvscsi_send_srp_event(evt_struct, hostdata, 0); |
| 789 | } |
| 790 | |
| 791 | /* ------------------------------------------------------------ |
| 792 | * Routines for driver initialization |
| 793 | */ |
| 794 | |
| 795 | /** |
| 796 | * map_persist_bufs: - Pre-map persistent data for adapter logins |
| 797 | * @hostdata: ibmvscsi_host_data of host |
| 798 | * |
| 799 | * Map the capabilities and adapter info DMA buffers to avoid runtime failures. |
| 800 | * Return 1 on error, 0 on success. |
| 801 | */ |
| 802 | static int map_persist_bufs(struct ibmvscsi_host_data *hostdata) |
| 803 | { |
| 804 | |
| 805 | hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps, |
| 806 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); |
| 807 | |
| 808 | if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) { |
| 809 | dev_err(hostdata->dev, "Unable to map capabilities buffer!\n"); |
| 810 | return 1; |
| 811 | } |
| 812 | |
| 813 | hostdata->adapter_info_addr = dma_map_single(hostdata->dev, |
| 814 | &hostdata->madapter_info, |
| 815 | sizeof(hostdata->madapter_info), |
| 816 | DMA_BIDIRECTIONAL); |
| 817 | if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) { |
| 818 | dev_err(hostdata->dev, "Unable to map adapter info buffer!\n"); |
| 819 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, |
| 820 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); |
| 821 | return 1; |
| 822 | } |
| 823 | |
| 824 | return 0; |
| 825 | } |
| 826 | |
| 827 | /** |
| 828 | * unmap_persist_bufs: - Unmap persistent data needed for adapter logins |
| 829 | * @hostdata: ibmvscsi_host_data of host |
| 830 | * |
| 831 | * Unmap the capabilities and adapter info DMA buffers |
| 832 | */ |
| 833 | static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata) |
| 834 | { |
| 835 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, |
| 836 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); |
| 837 | |
| 838 | dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr, |
| 839 | sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL); |
| 840 | } |
| 841 | |
| 842 | /** |
| 843 | * login_rsp: - Handle response to SRP login request |
| 844 | * @evt_struct: srp_event_struct with the response |
| 845 | * |
| 846 | * Used as a "done" callback by when sending srp_login. Gets called |
| 847 | * by ibmvscsi_handle_crq() |
| 848 | */ |
| 849 | static void login_rsp(struct srp_event_struct *evt_struct) |
| 850 | { |
| 851 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; |
| 852 | switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { |
| 853 | case SRP_LOGIN_RSP: /* it worked! */ |
| 854 | break; |
| 855 | case SRP_LOGIN_REJ: /* refused! */ |
| 856 | dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n", |
| 857 | evt_struct->xfer_iu->srp.login_rej.reason); |
| 858 | /* Login failed. */ |
| 859 | atomic_set(&hostdata->request_limit, -1); |
| 860 | return; |
| 861 | default: |
| 862 | dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n", |
| 863 | evt_struct->xfer_iu->srp.login_rsp.opcode); |
| 864 | /* Login failed. */ |
| 865 | atomic_set(&hostdata->request_limit, -1); |
| 866 | return; |
| 867 | } |
| 868 | |
| 869 | dev_info(hostdata->dev, "SRP_LOGIN succeeded\n"); |
| 870 | hostdata->client_migrated = 0; |
| 871 | |
| 872 | /* Now we know what the real request-limit is. |
| 873 | * This value is set rather than added to request_limit because |
| 874 | * request_limit could have been set to -1 by this client. |
| 875 | */ |
| 876 | atomic_set(&hostdata->request_limit, |
| 877 | evt_struct->xfer_iu->srp.login_rsp.req_lim_delta); |
| 878 | |
| 879 | /* If we had any pending I/Os, kick them */ |
| 880 | scsi_unblock_requests(hostdata->host); |
| 881 | } |
| 882 | |
| 883 | /** |
| 884 | * send_srp_login: - Sends the srp login |
| 885 | * @hostdata: ibmvscsi_host_data of host |
| 886 | * |
| 887 | * Returns zero if successful. |
| 888 | */ |
| 889 | static int send_srp_login(struct ibmvscsi_host_data *hostdata) |
| 890 | { |
| 891 | int rc; |
| 892 | unsigned long flags; |
| 893 | struct srp_login_req *login; |
| 894 | struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); |
| 895 | |
| 896 | BUG_ON(!evt_struct); |
| 897 | init_event_struct(evt_struct, login_rsp, |
| 898 | VIOSRP_SRP_FORMAT, login_timeout); |
| 899 | |
| 900 | login = &evt_struct->iu.srp.login_req; |
| 901 | memset(login, 0, sizeof(*login)); |
| 902 | login->opcode = SRP_LOGIN_REQ; |
| 903 | login->req_it_iu_len = sizeof(union srp_iu); |
| 904 | login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT; |
| 905 | |
| 906 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
| 907 | /* Start out with a request limit of 0, since this is negotiated in |
| 908 | * the login request we are just sending and login requests always |
| 909 | * get sent by the driver regardless of request_limit. |
| 910 | */ |
| 911 | atomic_set(&hostdata->request_limit, 0); |
| 912 | |
| 913 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2); |
| 914 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 915 | dev_info(hostdata->dev, "sent SRP login\n"); |
| 916 | return rc; |
| 917 | }; |
| 918 | |
| 919 | /** |
| 920 | * capabilities_rsp: - Handle response to MAD adapter capabilities request |
| 921 | * @evt_struct: srp_event_struct with the response |
| 922 | * |
| 923 | * Used as a "done" callback by when sending adapter_info. |
| 924 | */ |
| 925 | static void capabilities_rsp(struct srp_event_struct *evt_struct) |
| 926 | { |
| 927 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; |
| 928 | |
| 929 | if (evt_struct->xfer_iu->mad.capabilities.common.status) { |
| 930 | dev_err(hostdata->dev, "error 0x%X getting capabilities info\n", |
| 931 | evt_struct->xfer_iu->mad.capabilities.common.status); |
| 932 | } else { |
| 933 | if (hostdata->caps.migration.common.server_support != SERVER_SUPPORTS_CAP) |
| 934 | dev_info(hostdata->dev, "Partition migration not supported\n"); |
| 935 | |
| 936 | if (client_reserve) { |
| 937 | if (hostdata->caps.reserve.common.server_support == |
| 938 | SERVER_SUPPORTS_CAP) |
| 939 | dev_info(hostdata->dev, "Client reserve enabled\n"); |
| 940 | else |
| 941 | dev_info(hostdata->dev, "Client reserve not supported\n"); |
| 942 | } |
| 943 | } |
| 944 | |
| 945 | send_srp_login(hostdata); |
| 946 | } |
| 947 | |
| 948 | /** |
| 949 | * send_mad_capabilities: - Sends the mad capabilities request |
| 950 | * and stores the result so it can be retrieved with |
| 951 | * @hostdata: ibmvscsi_host_data of host |
| 952 | */ |
| 953 | static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata) |
| 954 | { |
| 955 | struct viosrp_capabilities *req; |
| 956 | struct srp_event_struct *evt_struct; |
| 957 | unsigned long flags; |
| 958 | struct device_node *of_node = hostdata->dev->archdata.of_node; |
| 959 | const char *location; |
| 960 | |
| 961 | evt_struct = get_event_struct(&hostdata->pool); |
| 962 | BUG_ON(!evt_struct); |
| 963 | |
| 964 | init_event_struct(evt_struct, capabilities_rsp, |
| 965 | VIOSRP_MAD_FORMAT, info_timeout); |
| 966 | |
| 967 | req = &evt_struct->iu.mad.capabilities; |
| 968 | memset(req, 0, sizeof(*req)); |
| 969 | |
| 970 | hostdata->caps.flags = CAP_LIST_SUPPORTED; |
| 971 | if (hostdata->client_migrated) |
| 972 | hostdata->caps.flags |= CLIENT_MIGRATED; |
| 973 | |
| 974 | strncpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev), |
| 975 | sizeof(hostdata->caps.name)); |
| 976 | hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0'; |
| 977 | |
| 978 | location = of_get_property(of_node, "ibm,loc-code", NULL); |
| 979 | location = location ? location : dev_name(hostdata->dev); |
| 980 | strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc)); |
| 981 | hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0'; |
| 982 | |
| 983 | req->common.type = VIOSRP_CAPABILITIES_TYPE; |
| 984 | req->buffer = hostdata->caps_addr; |
| 985 | |
| 986 | hostdata->caps.migration.common.cap_type = MIGRATION_CAPABILITIES; |
| 987 | hostdata->caps.migration.common.length = sizeof(hostdata->caps.migration); |
| 988 | hostdata->caps.migration.common.server_support = SERVER_SUPPORTS_CAP; |
| 989 | hostdata->caps.migration.ecl = 1; |
| 990 | |
| 991 | if (client_reserve) { |
| 992 | hostdata->caps.reserve.common.cap_type = RESERVATION_CAPABILITIES; |
| 993 | hostdata->caps.reserve.common.length = sizeof(hostdata->caps.reserve); |
| 994 | hostdata->caps.reserve.common.server_support = SERVER_SUPPORTS_CAP; |
| 995 | hostdata->caps.reserve.type = CLIENT_RESERVE_SCSI_2; |
| 996 | req->common.length = sizeof(hostdata->caps); |
| 997 | } else |
| 998 | req->common.length = sizeof(hostdata->caps) - sizeof(hostdata->caps.reserve); |
| 999 | |
| 1000 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
| 1001 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) |
| 1002 | dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n"); |
| 1003 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1004 | }; |
| 1005 | |
| 1006 | /** |
| 1007 | * fast_fail_rsp: - Handle response to MAD enable fast fail |
| 1008 | * @evt_struct: srp_event_struct with the response |
| 1009 | * |
| 1010 | * Used as a "done" callback by when sending enable fast fail. Gets called |
| 1011 | * by ibmvscsi_handle_crq() |
| 1012 | */ |
| 1013 | static void fast_fail_rsp(struct srp_event_struct *evt_struct) |
| 1014 | { |
| 1015 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; |
| 1016 | u8 status = evt_struct->xfer_iu->mad.fast_fail.common.status; |
| 1017 | |
| 1018 | if (status == VIOSRP_MAD_NOT_SUPPORTED) |
| 1019 | dev_err(hostdata->dev, "fast_fail not supported in server\n"); |
| 1020 | else if (status == VIOSRP_MAD_FAILED) |
| 1021 | dev_err(hostdata->dev, "fast_fail request failed\n"); |
| 1022 | else if (status != VIOSRP_MAD_SUCCESS) |
| 1023 | dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status); |
| 1024 | |
| 1025 | send_mad_capabilities(hostdata); |
| 1026 | } |
| 1027 | |
| 1028 | /** |
| 1029 | * init_host - Start host initialization |
| 1030 | * @hostdata: ibmvscsi_host_data of host |
| 1031 | * |
| 1032 | * Returns zero if successful. |
| 1033 | */ |
| 1034 | static int enable_fast_fail(struct ibmvscsi_host_data *hostdata) |
| 1035 | { |
| 1036 | int rc; |
| 1037 | unsigned long flags; |
| 1038 | struct viosrp_fast_fail *fast_fail_mad; |
| 1039 | struct srp_event_struct *evt_struct; |
| 1040 | |
| 1041 | if (!fast_fail) { |
| 1042 | send_mad_capabilities(hostdata); |
| 1043 | return 0; |
| 1044 | } |
| 1045 | |
| 1046 | evt_struct = get_event_struct(&hostdata->pool); |
| 1047 | BUG_ON(!evt_struct); |
| 1048 | |
| 1049 | init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout); |
| 1050 | |
| 1051 | fast_fail_mad = &evt_struct->iu.mad.fast_fail; |
| 1052 | memset(fast_fail_mad, 0, sizeof(*fast_fail_mad)); |
| 1053 | fast_fail_mad->common.type = VIOSRP_ENABLE_FAST_FAIL; |
| 1054 | fast_fail_mad->common.length = sizeof(*fast_fail_mad); |
| 1055 | |
| 1056 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
| 1057 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); |
| 1058 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1059 | return rc; |
| 1060 | } |
| 1061 | |
| 1062 | /** |
| 1063 | * adapter_info_rsp: - Handle response to MAD adapter info request |
| 1064 | * @evt_struct: srp_event_struct with the response |
| 1065 | * |
| 1066 | * Used as a "done" callback by when sending adapter_info. Gets called |
| 1067 | * by ibmvscsi_handle_crq() |
| 1068 | */ |
| 1069 | static void adapter_info_rsp(struct srp_event_struct *evt_struct) |
| 1070 | { |
| 1071 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; |
| 1072 | |
| 1073 | if (evt_struct->xfer_iu->mad.adapter_info.common.status) { |
| 1074 | dev_err(hostdata->dev, "error %d getting adapter info\n", |
| 1075 | evt_struct->xfer_iu->mad.adapter_info.common.status); |
| 1076 | } else { |
| 1077 | dev_info(hostdata->dev, "host srp version: %s, " |
| 1078 | "host partition %s (%d), OS %d, max io %u\n", |
| 1079 | hostdata->madapter_info.srp_version, |
| 1080 | hostdata->madapter_info.partition_name, |
| 1081 | hostdata->madapter_info.partition_number, |
| 1082 | hostdata->madapter_info.os_type, |
| 1083 | hostdata->madapter_info.port_max_txu[0]); |
| 1084 | |
| 1085 | if (hostdata->madapter_info.port_max_txu[0]) |
| 1086 | hostdata->host->max_sectors = |
| 1087 | hostdata->madapter_info.port_max_txu[0] >> 9; |
| 1088 | |
| 1089 | if (hostdata->madapter_info.os_type == 3 && |
| 1090 | strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { |
| 1091 | dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n", |
| 1092 | hostdata->madapter_info.srp_version); |
| 1093 | dev_err(hostdata->dev, "limiting scatterlists to %d\n", |
| 1094 | MAX_INDIRECT_BUFS); |
| 1095 | hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; |
| 1096 | } |
| 1097 | |
| 1098 | if (hostdata->madapter_info.os_type == 3) { |
| 1099 | enable_fast_fail(hostdata); |
| 1100 | return; |
| 1101 | } |
| 1102 | } |
| 1103 | |
| 1104 | send_srp_login(hostdata); |
| 1105 | } |
| 1106 | |
| 1107 | /** |
| 1108 | * send_mad_adapter_info: - Sends the mad adapter info request |
| 1109 | * and stores the result so it can be retrieved with |
| 1110 | * sysfs. We COULD consider causing a failure if the |
| 1111 | * returned SRP version doesn't match ours. |
| 1112 | * @hostdata: ibmvscsi_host_data of host |
| 1113 | * |
| 1114 | * Returns zero if successful. |
| 1115 | */ |
| 1116 | static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) |
| 1117 | { |
| 1118 | struct viosrp_adapter_info *req; |
| 1119 | struct srp_event_struct *evt_struct; |
| 1120 | unsigned long flags; |
| 1121 | |
| 1122 | evt_struct = get_event_struct(&hostdata->pool); |
| 1123 | BUG_ON(!evt_struct); |
| 1124 | |
| 1125 | init_event_struct(evt_struct, |
| 1126 | adapter_info_rsp, |
| 1127 | VIOSRP_MAD_FORMAT, |
| 1128 | info_timeout); |
| 1129 | |
| 1130 | req = &evt_struct->iu.mad.adapter_info; |
| 1131 | memset(req, 0x00, sizeof(*req)); |
| 1132 | |
| 1133 | req->common.type = VIOSRP_ADAPTER_INFO_TYPE; |
| 1134 | req->common.length = sizeof(hostdata->madapter_info); |
| 1135 | req->buffer = hostdata->adapter_info_addr; |
| 1136 | |
| 1137 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
| 1138 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) |
| 1139 | dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n"); |
| 1140 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1141 | }; |
| 1142 | |
| 1143 | /** |
| 1144 | * init_adapter: Start virtual adapter initialization sequence |
| 1145 | * |
| 1146 | */ |
| 1147 | static void init_adapter(struct ibmvscsi_host_data *hostdata) |
| 1148 | { |
| 1149 | send_mad_adapter_info(hostdata); |
| 1150 | } |
| 1151 | |
| 1152 | /** |
| 1153 | * sync_completion: Signal that a synchronous command has completed |
| 1154 | * Note that after returning from this call, the evt_struct is freed. |
| 1155 | * the caller waiting on this completion shouldn't touch the evt_struct |
| 1156 | * again. |
| 1157 | */ |
| 1158 | static void sync_completion(struct srp_event_struct *evt_struct) |
| 1159 | { |
| 1160 | /* copy the response back */ |
| 1161 | if (evt_struct->sync_srp) |
| 1162 | *evt_struct->sync_srp = *evt_struct->xfer_iu; |
| 1163 | |
| 1164 | complete(&evt_struct->comp); |
| 1165 | } |
| 1166 | |
| 1167 | /** |
| 1168 | * ibmvscsi_abort: Abort a command...from scsi host template |
| 1169 | * send this over to the server and wait synchronously for the response |
| 1170 | */ |
| 1171 | static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) |
| 1172 | { |
| 1173 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
| 1174 | struct srp_tsk_mgmt *tsk_mgmt; |
| 1175 | struct srp_event_struct *evt; |
| 1176 | struct srp_event_struct *tmp_evt, *found_evt; |
| 1177 | union viosrp_iu srp_rsp; |
| 1178 | int rsp_rc; |
| 1179 | unsigned long flags; |
| 1180 | u16 lun = lun_from_dev(cmd->device); |
| 1181 | unsigned long wait_switch = 0; |
| 1182 | |
| 1183 | /* First, find this command in our sent list so we can figure |
| 1184 | * out the correct tag |
| 1185 | */ |
| 1186 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
| 1187 | wait_switch = jiffies + (init_timeout * HZ); |
| 1188 | do { |
| 1189 | found_evt = NULL; |
| 1190 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { |
| 1191 | if (tmp_evt->cmnd == cmd) { |
| 1192 | found_evt = tmp_evt; |
| 1193 | break; |
| 1194 | } |
| 1195 | } |
| 1196 | |
| 1197 | if (!found_evt) { |
| 1198 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1199 | return SUCCESS; |
| 1200 | } |
| 1201 | |
| 1202 | evt = get_event_struct(&hostdata->pool); |
| 1203 | if (evt == NULL) { |
| 1204 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1205 | sdev_printk(KERN_ERR, cmd->device, |
| 1206 | "failed to allocate abort event\n"); |
| 1207 | return FAILED; |
| 1208 | } |
| 1209 | |
| 1210 | init_event_struct(evt, |
| 1211 | sync_completion, |
| 1212 | VIOSRP_SRP_FORMAT, |
| 1213 | abort_timeout); |
| 1214 | |
| 1215 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
| 1216 | |
| 1217 | /* Set up an abort SRP command */ |
| 1218 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); |
| 1219 | tsk_mgmt->opcode = SRP_TSK_MGMT; |
| 1220 | tsk_mgmt->lun = ((u64) lun) << 48; |
| 1221 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; |
| 1222 | tsk_mgmt->task_tag = (u64) found_evt; |
| 1223 | |
| 1224 | evt->sync_srp = &srp_rsp; |
| 1225 | |
| 1226 | init_completion(&evt->comp); |
| 1227 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2); |
| 1228 | |
| 1229 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) |
| 1230 | break; |
| 1231 | |
| 1232 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1233 | msleep(10); |
| 1234 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
| 1235 | } while (time_before(jiffies, wait_switch)); |
| 1236 | |
| 1237 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1238 | |
| 1239 | if (rsp_rc != 0) { |
| 1240 | sdev_printk(KERN_ERR, cmd->device, |
| 1241 | "failed to send abort() event. rc=%d\n", rsp_rc); |
| 1242 | return FAILED; |
| 1243 | } |
| 1244 | |
| 1245 | sdev_printk(KERN_INFO, cmd->device, |
| 1246 | "aborting command. lun 0x%llx, tag 0x%llx\n", |
| 1247 | (((u64) lun) << 48), (u64) found_evt); |
| 1248 | |
| 1249 | wait_for_completion(&evt->comp); |
| 1250 | |
| 1251 | /* make sure we got a good response */ |
| 1252 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
| 1253 | if (printk_ratelimit()) |
| 1254 | sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n", |
| 1255 | srp_rsp.srp.rsp.opcode); |
| 1256 | return FAILED; |
| 1257 | } |
| 1258 | |
| 1259 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
| 1260 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); |
| 1261 | else |
| 1262 | rsp_rc = srp_rsp.srp.rsp.status; |
| 1263 | |
| 1264 | if (rsp_rc) { |
| 1265 | if (printk_ratelimit()) |
| 1266 | sdev_printk(KERN_WARNING, cmd->device, |
| 1267 | "abort code %d for task tag 0x%llx\n", |
| 1268 | rsp_rc, tsk_mgmt->task_tag); |
| 1269 | return FAILED; |
| 1270 | } |
| 1271 | |
| 1272 | /* Because we dropped the spinlock above, it's possible |
| 1273 | * The event is no longer in our list. Make sure it didn't |
| 1274 | * complete while we were aborting |
| 1275 | */ |
| 1276 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
| 1277 | found_evt = NULL; |
| 1278 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { |
| 1279 | if (tmp_evt->cmnd == cmd) { |
| 1280 | found_evt = tmp_evt; |
| 1281 | break; |
| 1282 | } |
| 1283 | } |
| 1284 | |
| 1285 | if (found_evt == NULL) { |
| 1286 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1287 | sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n", |
| 1288 | tsk_mgmt->task_tag); |
| 1289 | return SUCCESS; |
| 1290 | } |
| 1291 | |
| 1292 | sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n", |
| 1293 | tsk_mgmt->task_tag); |
| 1294 | |
| 1295 | cmd->result = (DID_ABORT << 16); |
| 1296 | list_del(&found_evt->list); |
| 1297 | unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, |
| 1298 | found_evt->hostdata->dev); |
| 1299 | free_event_struct(&found_evt->hostdata->pool, found_evt); |
| 1300 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1301 | atomic_inc(&hostdata->request_limit); |
| 1302 | return SUCCESS; |
| 1303 | } |
| 1304 | |
| 1305 | /** |
| 1306 | * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host |
| 1307 | * template send this over to the server and wait synchronously for the |
| 1308 | * response |
| 1309 | */ |
| 1310 | static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) |
| 1311 | { |
| 1312 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
| 1313 | struct srp_tsk_mgmt *tsk_mgmt; |
| 1314 | struct srp_event_struct *evt; |
| 1315 | struct srp_event_struct *tmp_evt, *pos; |
| 1316 | union viosrp_iu srp_rsp; |
| 1317 | int rsp_rc; |
| 1318 | unsigned long flags; |
| 1319 | u16 lun = lun_from_dev(cmd->device); |
| 1320 | unsigned long wait_switch = 0; |
| 1321 | |
| 1322 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
| 1323 | wait_switch = jiffies + (init_timeout * HZ); |
| 1324 | do { |
| 1325 | evt = get_event_struct(&hostdata->pool); |
| 1326 | if (evt == NULL) { |
| 1327 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1328 | sdev_printk(KERN_ERR, cmd->device, |
| 1329 | "failed to allocate reset event\n"); |
| 1330 | return FAILED; |
| 1331 | } |
| 1332 | |
| 1333 | init_event_struct(evt, |
| 1334 | sync_completion, |
| 1335 | VIOSRP_SRP_FORMAT, |
| 1336 | reset_timeout); |
| 1337 | |
| 1338 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
| 1339 | |
| 1340 | /* Set up a lun reset SRP command */ |
| 1341 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); |
| 1342 | tsk_mgmt->opcode = SRP_TSK_MGMT; |
| 1343 | tsk_mgmt->lun = ((u64) lun) << 48; |
| 1344 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; |
| 1345 | |
| 1346 | evt->sync_srp = &srp_rsp; |
| 1347 | |
| 1348 | init_completion(&evt->comp); |
| 1349 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2); |
| 1350 | |
| 1351 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) |
| 1352 | break; |
| 1353 | |
| 1354 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1355 | msleep(10); |
| 1356 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
| 1357 | } while (time_before(jiffies, wait_switch)); |
| 1358 | |
| 1359 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1360 | |
| 1361 | if (rsp_rc != 0) { |
| 1362 | sdev_printk(KERN_ERR, cmd->device, |
| 1363 | "failed to send reset event. rc=%d\n", rsp_rc); |
| 1364 | return FAILED; |
| 1365 | } |
| 1366 | |
| 1367 | sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n", |
| 1368 | (((u64) lun) << 48)); |
| 1369 | |
| 1370 | wait_for_completion(&evt->comp); |
| 1371 | |
| 1372 | /* make sure we got a good response */ |
| 1373 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
| 1374 | if (printk_ratelimit()) |
| 1375 | sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n", |
| 1376 | srp_rsp.srp.rsp.opcode); |
| 1377 | return FAILED; |
| 1378 | } |
| 1379 | |
| 1380 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
| 1381 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); |
| 1382 | else |
| 1383 | rsp_rc = srp_rsp.srp.rsp.status; |
| 1384 | |
| 1385 | if (rsp_rc) { |
| 1386 | if (printk_ratelimit()) |
| 1387 | sdev_printk(KERN_WARNING, cmd->device, |
| 1388 | "reset code %d for task tag 0x%llx\n", |
| 1389 | rsp_rc, tsk_mgmt->task_tag); |
| 1390 | return FAILED; |
| 1391 | } |
| 1392 | |
| 1393 | /* We need to find all commands for this LUN that have not yet been |
| 1394 | * responded to, and fail them with DID_RESET |
| 1395 | */ |
| 1396 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
| 1397 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
| 1398 | if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { |
| 1399 | if (tmp_evt->cmnd) |
| 1400 | tmp_evt->cmnd->result = (DID_RESET << 16); |
| 1401 | list_del(&tmp_evt->list); |
| 1402 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, |
| 1403 | tmp_evt->hostdata->dev); |
| 1404 | free_event_struct(&tmp_evt->hostdata->pool, |
| 1405 | tmp_evt); |
| 1406 | atomic_inc(&hostdata->request_limit); |
| 1407 | if (tmp_evt->cmnd_done) |
| 1408 | tmp_evt->cmnd_done(tmp_evt->cmnd); |
| 1409 | else if (tmp_evt->done) |
| 1410 | tmp_evt->done(tmp_evt); |
| 1411 | } |
| 1412 | } |
| 1413 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1414 | return SUCCESS; |
| 1415 | } |
| 1416 | |
| 1417 | /** |
| 1418 | * ibmvscsi_eh_host_reset_handler - Reset the connection to the server |
| 1419 | * @cmd: struct scsi_cmnd having problems |
| 1420 | */ |
| 1421 | static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd) |
| 1422 | { |
| 1423 | unsigned long wait_switch = 0; |
| 1424 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
| 1425 | |
| 1426 | dev_err(hostdata->dev, "Resetting connection due to error recovery\n"); |
| 1427 | |
| 1428 | ibmvscsi_reset_host(hostdata); |
| 1429 | |
| 1430 | for (wait_switch = jiffies + (init_timeout * HZ); |
| 1431 | time_before(jiffies, wait_switch) && |
| 1432 | atomic_read(&hostdata->request_limit) < 2;) { |
| 1433 | |
| 1434 | msleep(10); |
| 1435 | } |
| 1436 | |
| 1437 | if (atomic_read(&hostdata->request_limit) <= 0) |
| 1438 | return FAILED; |
| 1439 | |
| 1440 | return SUCCESS; |
| 1441 | } |
| 1442 | |
| 1443 | /** |
| 1444 | * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ |
| 1445 | * @crq: Command/Response queue |
| 1446 | * @hostdata: ibmvscsi_host_data of host |
| 1447 | * |
| 1448 | */ |
| 1449 | void ibmvscsi_handle_crq(struct viosrp_crq *crq, |
| 1450 | struct ibmvscsi_host_data *hostdata) |
| 1451 | { |
| 1452 | long rc; |
| 1453 | unsigned long flags; |
| 1454 | struct srp_event_struct *evt_struct = |
| 1455 | (struct srp_event_struct *)crq->IU_data_ptr; |
| 1456 | switch (crq->valid) { |
| 1457 | case 0xC0: /* initialization */ |
| 1458 | switch (crq->format) { |
| 1459 | case 0x01: /* Initialization message */ |
| 1460 | dev_info(hostdata->dev, "partner initialized\n"); |
| 1461 | /* Send back a response */ |
| 1462 | if ((rc = ibmvscsi_ops->send_crq(hostdata, |
| 1463 | 0xC002000000000000LL, 0)) == 0) { |
| 1464 | /* Now login */ |
| 1465 | init_adapter(hostdata); |
| 1466 | } else { |
| 1467 | dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc); |
| 1468 | } |
| 1469 | |
| 1470 | break; |
| 1471 | case 0x02: /* Initialization response */ |
| 1472 | dev_info(hostdata->dev, "partner initialization complete\n"); |
| 1473 | |
| 1474 | /* Now login */ |
| 1475 | init_adapter(hostdata); |
| 1476 | break; |
| 1477 | default: |
| 1478 | dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format); |
| 1479 | } |
| 1480 | return; |
| 1481 | case 0xFF: /* Hypervisor telling us the connection is closed */ |
| 1482 | scsi_block_requests(hostdata->host); |
| 1483 | atomic_set(&hostdata->request_limit, 0); |
| 1484 | if (crq->format == 0x06) { |
| 1485 | /* We need to re-setup the interpartition connection */ |
| 1486 | dev_info(hostdata->dev, "Re-enabling adapter!\n"); |
| 1487 | hostdata->client_migrated = 1; |
| 1488 | purge_requests(hostdata, DID_REQUEUE); |
| 1489 | if ((ibmvscsi_ops->reenable_crq_queue(&hostdata->queue, |
| 1490 | hostdata)) || |
| 1491 | (ibmvscsi_ops->send_crq(hostdata, |
| 1492 | 0xC001000000000000LL, 0))) { |
| 1493 | atomic_set(&hostdata->request_limit, |
| 1494 | -1); |
| 1495 | dev_err(hostdata->dev, "error after enable\n"); |
| 1496 | } |
| 1497 | } else { |
| 1498 | dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n", |
| 1499 | crq->format); |
| 1500 | |
| 1501 | purge_requests(hostdata, DID_ERROR); |
| 1502 | if ((ibmvscsi_ops->reset_crq_queue(&hostdata->queue, |
| 1503 | hostdata)) || |
| 1504 | (ibmvscsi_ops->send_crq(hostdata, |
| 1505 | 0xC001000000000000LL, 0))) { |
| 1506 | atomic_set(&hostdata->request_limit, |
| 1507 | -1); |
| 1508 | dev_err(hostdata->dev, "error after reset\n"); |
| 1509 | } |
| 1510 | } |
| 1511 | scsi_unblock_requests(hostdata->host); |
| 1512 | return; |
| 1513 | case 0x80: /* real payload */ |
| 1514 | break; |
| 1515 | default: |
| 1516 | dev_err(hostdata->dev, "got an invalid message type 0x%02x\n", |
| 1517 | crq->valid); |
| 1518 | return; |
| 1519 | } |
| 1520 | |
| 1521 | /* The only kind of payload CRQs we should get are responses to |
| 1522 | * things we send. Make sure this response is to something we |
| 1523 | * actually sent |
| 1524 | */ |
| 1525 | if (!valid_event_struct(&hostdata->pool, evt_struct)) { |
| 1526 | dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n", |
| 1527 | (void *)crq->IU_data_ptr); |
| 1528 | return; |
| 1529 | } |
| 1530 | |
| 1531 | if (atomic_read(&evt_struct->free)) { |
| 1532 | dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n", |
| 1533 | (void *)crq->IU_data_ptr); |
| 1534 | return; |
| 1535 | } |
| 1536 | |
| 1537 | if (crq->format == VIOSRP_SRP_FORMAT) |
| 1538 | atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta, |
| 1539 | &hostdata->request_limit); |
| 1540 | |
| 1541 | del_timer(&evt_struct->timer); |
| 1542 | |
| 1543 | if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd) |
| 1544 | evt_struct->cmnd->result = DID_ERROR << 16; |
| 1545 | if (evt_struct->done) |
| 1546 | evt_struct->done(evt_struct); |
| 1547 | else |
| 1548 | dev_err(hostdata->dev, "returned done() is NULL; not running it!\n"); |
| 1549 | |
| 1550 | /* |
| 1551 | * Lock the host_lock before messing with these structures, since we |
| 1552 | * are running in a task context |
| 1553 | */ |
| 1554 | spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); |
| 1555 | list_del(&evt_struct->list); |
| 1556 | free_event_struct(&evt_struct->hostdata->pool, evt_struct); |
| 1557 | spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); |
| 1558 | } |
| 1559 | |
| 1560 | /** |
| 1561 | * ibmvscsi_get_host_config: Send the command to the server to get host |
| 1562 | * configuration data. The data is opaque to us. |
| 1563 | */ |
| 1564 | static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata, |
| 1565 | unsigned char *buffer, int length) |
| 1566 | { |
| 1567 | struct viosrp_host_config *host_config; |
| 1568 | struct srp_event_struct *evt_struct; |
| 1569 | unsigned long flags; |
| 1570 | dma_addr_t addr; |
| 1571 | int rc; |
| 1572 | |
| 1573 | evt_struct = get_event_struct(&hostdata->pool); |
| 1574 | if (!evt_struct) { |
| 1575 | dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n"); |
| 1576 | return -1; |
| 1577 | } |
| 1578 | |
| 1579 | init_event_struct(evt_struct, |
| 1580 | sync_completion, |
| 1581 | VIOSRP_MAD_FORMAT, |
| 1582 | info_timeout); |
| 1583 | |
| 1584 | host_config = &evt_struct->iu.mad.host_config; |
| 1585 | |
| 1586 | /* Set up a lun reset SRP command */ |
| 1587 | memset(host_config, 0x00, sizeof(*host_config)); |
| 1588 | host_config->common.type = VIOSRP_HOST_CONFIG_TYPE; |
| 1589 | host_config->common.length = length; |
| 1590 | host_config->buffer = addr = dma_map_single(hostdata->dev, buffer, |
| 1591 | length, |
| 1592 | DMA_BIDIRECTIONAL); |
| 1593 | |
| 1594 | if (dma_mapping_error(hostdata->dev, host_config->buffer)) { |
| 1595 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
| 1596 | dev_err(hostdata->dev, |
| 1597 | "dma_mapping error getting host config\n"); |
| 1598 | free_event_struct(&hostdata->pool, evt_struct); |
| 1599 | return -1; |
| 1600 | } |
| 1601 | |
| 1602 | init_completion(&evt_struct->comp); |
| 1603 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
| 1604 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); |
| 1605 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1606 | if (rc == 0) |
| 1607 | wait_for_completion(&evt_struct->comp); |
| 1608 | dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL); |
| 1609 | |
| 1610 | return rc; |
| 1611 | } |
| 1612 | |
| 1613 | /** |
| 1614 | * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk. |
| 1615 | * @sdev: struct scsi_device device to configure |
| 1616 | * |
| 1617 | * Enable allow_restart for a device if it is a disk. Adjust the |
| 1618 | * queue_depth here also as is required by the documentation for |
| 1619 | * struct scsi_host_template. |
| 1620 | */ |
| 1621 | static int ibmvscsi_slave_configure(struct scsi_device *sdev) |
| 1622 | { |
| 1623 | struct Scsi_Host *shost = sdev->host; |
| 1624 | unsigned long lock_flags = 0; |
| 1625 | |
| 1626 | spin_lock_irqsave(shost->host_lock, lock_flags); |
| 1627 | if (sdev->type == TYPE_DISK) { |
| 1628 | sdev->allow_restart = 1; |
| 1629 | blk_queue_rq_timeout(sdev->request_queue, 120 * HZ); |
| 1630 | } |
| 1631 | scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun); |
| 1632 | spin_unlock_irqrestore(shost->host_lock, lock_flags); |
| 1633 | return 0; |
| 1634 | } |
| 1635 | |
| 1636 | /** |
| 1637 | * ibmvscsi_change_queue_depth - Change the device's queue depth |
| 1638 | * @sdev: scsi device struct |
| 1639 | * @qdepth: depth to set |
| 1640 | * @reason: calling context |
| 1641 | * |
| 1642 | * Return value: |
| 1643 | * actual depth set |
| 1644 | **/ |
| 1645 | static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth, |
| 1646 | int reason) |
| 1647 | { |
| 1648 | if (reason != SCSI_QDEPTH_DEFAULT) |
| 1649 | return -EOPNOTSUPP; |
| 1650 | |
| 1651 | if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN) |
| 1652 | qdepth = IBMVSCSI_MAX_CMDS_PER_LUN; |
| 1653 | |
| 1654 | scsi_adjust_queue_depth(sdev, 0, qdepth); |
| 1655 | return sdev->queue_depth; |
| 1656 | } |
| 1657 | |
| 1658 | /* ------------------------------------------------------------ |
| 1659 | * sysfs attributes |
| 1660 | */ |
| 1661 | static ssize_t show_host_vhost_loc(struct device *dev, |
| 1662 | struct device_attribute *attr, char *buf) |
| 1663 | { |
| 1664 | struct Scsi_Host *shost = class_to_shost(dev); |
| 1665 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
| 1666 | int len; |
| 1667 | |
| 1668 | len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n", |
| 1669 | hostdata->caps.loc); |
| 1670 | return len; |
| 1671 | } |
| 1672 | |
| 1673 | static struct device_attribute ibmvscsi_host_vhost_loc = { |
| 1674 | .attr = { |
| 1675 | .name = "vhost_loc", |
| 1676 | .mode = S_IRUGO, |
| 1677 | }, |
| 1678 | .show = show_host_vhost_loc, |
| 1679 | }; |
| 1680 | |
| 1681 | static ssize_t show_host_vhost_name(struct device *dev, |
| 1682 | struct device_attribute *attr, char *buf) |
| 1683 | { |
| 1684 | struct Scsi_Host *shost = class_to_shost(dev); |
| 1685 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
| 1686 | int len; |
| 1687 | |
| 1688 | len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n", |
| 1689 | hostdata->caps.name); |
| 1690 | return len; |
| 1691 | } |
| 1692 | |
| 1693 | static struct device_attribute ibmvscsi_host_vhost_name = { |
| 1694 | .attr = { |
| 1695 | .name = "vhost_name", |
| 1696 | .mode = S_IRUGO, |
| 1697 | }, |
| 1698 | .show = show_host_vhost_name, |
| 1699 | }; |
| 1700 | |
| 1701 | static ssize_t show_host_srp_version(struct device *dev, |
| 1702 | struct device_attribute *attr, char *buf) |
| 1703 | { |
| 1704 | struct Scsi_Host *shost = class_to_shost(dev); |
| 1705 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
| 1706 | int len; |
| 1707 | |
| 1708 | len = snprintf(buf, PAGE_SIZE, "%s\n", |
| 1709 | hostdata->madapter_info.srp_version); |
| 1710 | return len; |
| 1711 | } |
| 1712 | |
| 1713 | static struct device_attribute ibmvscsi_host_srp_version = { |
| 1714 | .attr = { |
| 1715 | .name = "srp_version", |
| 1716 | .mode = S_IRUGO, |
| 1717 | }, |
| 1718 | .show = show_host_srp_version, |
| 1719 | }; |
| 1720 | |
| 1721 | static ssize_t show_host_partition_name(struct device *dev, |
| 1722 | struct device_attribute *attr, |
| 1723 | char *buf) |
| 1724 | { |
| 1725 | struct Scsi_Host *shost = class_to_shost(dev); |
| 1726 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
| 1727 | int len; |
| 1728 | |
| 1729 | len = snprintf(buf, PAGE_SIZE, "%s\n", |
| 1730 | hostdata->madapter_info.partition_name); |
| 1731 | return len; |
| 1732 | } |
| 1733 | |
| 1734 | static struct device_attribute ibmvscsi_host_partition_name = { |
| 1735 | .attr = { |
| 1736 | .name = "partition_name", |
| 1737 | .mode = S_IRUGO, |
| 1738 | }, |
| 1739 | .show = show_host_partition_name, |
| 1740 | }; |
| 1741 | |
| 1742 | static ssize_t show_host_partition_number(struct device *dev, |
| 1743 | struct device_attribute *attr, |
| 1744 | char *buf) |
| 1745 | { |
| 1746 | struct Scsi_Host *shost = class_to_shost(dev); |
| 1747 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
| 1748 | int len; |
| 1749 | |
| 1750 | len = snprintf(buf, PAGE_SIZE, "%d\n", |
| 1751 | hostdata->madapter_info.partition_number); |
| 1752 | return len; |
| 1753 | } |
| 1754 | |
| 1755 | static struct device_attribute ibmvscsi_host_partition_number = { |
| 1756 | .attr = { |
| 1757 | .name = "partition_number", |
| 1758 | .mode = S_IRUGO, |
| 1759 | }, |
| 1760 | .show = show_host_partition_number, |
| 1761 | }; |
| 1762 | |
| 1763 | static ssize_t show_host_mad_version(struct device *dev, |
| 1764 | struct device_attribute *attr, char *buf) |
| 1765 | { |
| 1766 | struct Scsi_Host *shost = class_to_shost(dev); |
| 1767 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
| 1768 | int len; |
| 1769 | |
| 1770 | len = snprintf(buf, PAGE_SIZE, "%d\n", |
| 1771 | hostdata->madapter_info.mad_version); |
| 1772 | return len; |
| 1773 | } |
| 1774 | |
| 1775 | static struct device_attribute ibmvscsi_host_mad_version = { |
| 1776 | .attr = { |
| 1777 | .name = "mad_version", |
| 1778 | .mode = S_IRUGO, |
| 1779 | }, |
| 1780 | .show = show_host_mad_version, |
| 1781 | }; |
| 1782 | |
| 1783 | static ssize_t show_host_os_type(struct device *dev, |
| 1784 | struct device_attribute *attr, char *buf) |
| 1785 | { |
| 1786 | struct Scsi_Host *shost = class_to_shost(dev); |
| 1787 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
| 1788 | int len; |
| 1789 | |
| 1790 | len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type); |
| 1791 | return len; |
| 1792 | } |
| 1793 | |
| 1794 | static struct device_attribute ibmvscsi_host_os_type = { |
| 1795 | .attr = { |
| 1796 | .name = "os_type", |
| 1797 | .mode = S_IRUGO, |
| 1798 | }, |
| 1799 | .show = show_host_os_type, |
| 1800 | }; |
| 1801 | |
| 1802 | static ssize_t show_host_config(struct device *dev, |
| 1803 | struct device_attribute *attr, char *buf) |
| 1804 | { |
| 1805 | struct Scsi_Host *shost = class_to_shost(dev); |
| 1806 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
| 1807 | |
| 1808 | /* returns null-terminated host config data */ |
| 1809 | if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0) |
| 1810 | return strlen(buf); |
| 1811 | else |
| 1812 | return 0; |
| 1813 | } |
| 1814 | |
| 1815 | static struct device_attribute ibmvscsi_host_config = { |
| 1816 | .attr = { |
| 1817 | .name = "config", |
| 1818 | .mode = S_IRUGO, |
| 1819 | }, |
| 1820 | .show = show_host_config, |
| 1821 | }; |
| 1822 | |
| 1823 | static struct device_attribute *ibmvscsi_attrs[] = { |
| 1824 | &ibmvscsi_host_vhost_loc, |
| 1825 | &ibmvscsi_host_vhost_name, |
| 1826 | &ibmvscsi_host_srp_version, |
| 1827 | &ibmvscsi_host_partition_name, |
| 1828 | &ibmvscsi_host_partition_number, |
| 1829 | &ibmvscsi_host_mad_version, |
| 1830 | &ibmvscsi_host_os_type, |
| 1831 | &ibmvscsi_host_config, |
| 1832 | NULL |
| 1833 | }; |
| 1834 | |
| 1835 | /* ------------------------------------------------------------ |
| 1836 | * SCSI driver registration |
| 1837 | */ |
| 1838 | static struct scsi_host_template driver_template = { |
| 1839 | .module = THIS_MODULE, |
| 1840 | .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, |
| 1841 | .proc_name = "ibmvscsi", |
| 1842 | .queuecommand = ibmvscsi_queuecommand, |
| 1843 | .eh_abort_handler = ibmvscsi_eh_abort_handler, |
| 1844 | .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, |
| 1845 | .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler, |
| 1846 | .slave_configure = ibmvscsi_slave_configure, |
| 1847 | .change_queue_depth = ibmvscsi_change_queue_depth, |
| 1848 | .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT, |
| 1849 | .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, |
| 1850 | .this_id = -1, |
| 1851 | .sg_tablesize = SG_ALL, |
| 1852 | .use_clustering = ENABLE_CLUSTERING, |
| 1853 | .shost_attrs = ibmvscsi_attrs, |
| 1854 | }; |
| 1855 | |
| 1856 | /** |
| 1857 | * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver |
| 1858 | * |
| 1859 | * @vdev: struct vio_dev for the device whose desired IO mem is to be returned |
| 1860 | * |
| 1861 | * Return value: |
| 1862 | * Number of bytes of IO data the driver will need to perform well. |
| 1863 | */ |
| 1864 | static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev) |
| 1865 | { |
| 1866 | /* iu_storage data allocated in initialize_event_pool */ |
| 1867 | unsigned long desired_io = max_events * sizeof(union viosrp_iu); |
| 1868 | |
| 1869 | /* add io space for sg data */ |
| 1870 | desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 * |
| 1871 | IBMVSCSI_CMDS_PER_LUN_DEFAULT); |
| 1872 | |
| 1873 | return desired_io; |
| 1874 | } |
| 1875 | |
| 1876 | /** |
| 1877 | * Called by bus code for each adapter |
| 1878 | */ |
| 1879 | static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) |
| 1880 | { |
| 1881 | struct ibmvscsi_host_data *hostdata; |
| 1882 | struct Scsi_Host *host; |
| 1883 | struct device *dev = &vdev->dev; |
| 1884 | struct srp_rport_identifiers ids; |
| 1885 | struct srp_rport *rport; |
| 1886 | unsigned long wait_switch = 0; |
| 1887 | int rc; |
| 1888 | |
| 1889 | dev_set_drvdata(&vdev->dev, NULL); |
| 1890 | |
| 1891 | host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); |
| 1892 | if (!host) { |
| 1893 | dev_err(&vdev->dev, "couldn't allocate host data\n"); |
| 1894 | goto scsi_host_alloc_failed; |
| 1895 | } |
| 1896 | |
| 1897 | host->transportt = ibmvscsi_transport_template; |
| 1898 | hostdata = shost_priv(host); |
| 1899 | memset(hostdata, 0x00, sizeof(*hostdata)); |
| 1900 | INIT_LIST_HEAD(&hostdata->sent); |
| 1901 | hostdata->host = host; |
| 1902 | hostdata->dev = dev; |
| 1903 | atomic_set(&hostdata->request_limit, -1); |
| 1904 | hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT; |
| 1905 | |
| 1906 | if (map_persist_bufs(hostdata)) { |
| 1907 | dev_err(&vdev->dev, "couldn't map persistent buffers\n"); |
| 1908 | goto persist_bufs_failed; |
| 1909 | } |
| 1910 | |
| 1911 | rc = ibmvscsi_ops->init_crq_queue(&hostdata->queue, hostdata, max_events); |
| 1912 | if (rc != 0 && rc != H_RESOURCE) { |
| 1913 | dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc); |
| 1914 | goto init_crq_failed; |
| 1915 | } |
| 1916 | if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) { |
| 1917 | dev_err(&vdev->dev, "couldn't initialize event pool\n"); |
| 1918 | goto init_pool_failed; |
| 1919 | } |
| 1920 | |
| 1921 | host->max_lun = 8; |
| 1922 | host->max_id = max_id; |
| 1923 | host->max_channel = max_channel; |
| 1924 | host->max_cmd_len = 16; |
| 1925 | |
| 1926 | if (scsi_add_host(hostdata->host, hostdata->dev)) |
| 1927 | goto add_host_failed; |
| 1928 | |
| 1929 | /* we don't have a proper target_port_id so let's use the fake one */ |
| 1930 | memcpy(ids.port_id, hostdata->madapter_info.partition_name, |
| 1931 | sizeof(ids.port_id)); |
| 1932 | ids.roles = SRP_RPORT_ROLE_TARGET; |
| 1933 | rport = srp_rport_add(host, &ids); |
| 1934 | if (IS_ERR(rport)) |
| 1935 | goto add_srp_port_failed; |
| 1936 | |
| 1937 | /* Try to send an initialization message. Note that this is allowed |
| 1938 | * to fail if the other end is not acive. In that case we don't |
| 1939 | * want to scan |
| 1940 | */ |
| 1941 | if (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0) == 0 |
| 1942 | || rc == H_RESOURCE) { |
| 1943 | /* |
| 1944 | * Wait around max init_timeout secs for the adapter to finish |
| 1945 | * initializing. When we are done initializing, we will have a |
| 1946 | * valid request_limit. We don't want Linux scanning before |
| 1947 | * we are ready. |
| 1948 | */ |
| 1949 | for (wait_switch = jiffies + (init_timeout * HZ); |
| 1950 | time_before(jiffies, wait_switch) && |
| 1951 | atomic_read(&hostdata->request_limit) < 2;) { |
| 1952 | |
| 1953 | msleep(10); |
| 1954 | } |
| 1955 | |
| 1956 | /* if we now have a valid request_limit, initiate a scan */ |
| 1957 | if (atomic_read(&hostdata->request_limit) > 0) |
| 1958 | scsi_scan_host(host); |
| 1959 | } |
| 1960 | |
| 1961 | dev_set_drvdata(&vdev->dev, hostdata); |
| 1962 | return 0; |
| 1963 | |
| 1964 | add_srp_port_failed: |
| 1965 | scsi_remove_host(hostdata->host); |
| 1966 | add_host_failed: |
| 1967 | release_event_pool(&hostdata->pool, hostdata); |
| 1968 | init_pool_failed: |
| 1969 | ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, max_events); |
| 1970 | init_crq_failed: |
| 1971 | unmap_persist_bufs(hostdata); |
| 1972 | persist_bufs_failed: |
| 1973 | scsi_host_put(host); |
| 1974 | scsi_host_alloc_failed: |
| 1975 | return -1; |
| 1976 | } |
| 1977 | |
| 1978 | static int ibmvscsi_remove(struct vio_dev *vdev) |
| 1979 | { |
| 1980 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev); |
| 1981 | unmap_persist_bufs(hostdata); |
| 1982 | release_event_pool(&hostdata->pool, hostdata); |
| 1983 | ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, |
| 1984 | max_events); |
| 1985 | |
| 1986 | srp_remove_host(hostdata->host); |
| 1987 | scsi_remove_host(hostdata->host); |
| 1988 | scsi_host_put(hostdata->host); |
| 1989 | |
| 1990 | return 0; |
| 1991 | } |
| 1992 | |
| 1993 | /** |
| 1994 | * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we |
| 1995 | * support. |
| 1996 | */ |
| 1997 | static struct vio_device_id ibmvscsi_device_table[] __devinitdata = { |
| 1998 | {"vscsi", "IBM,v-scsi"}, |
| 1999 | { "", "" } |
| 2000 | }; |
| 2001 | MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
| 2002 | |
| 2003 | static struct vio_driver ibmvscsi_driver = { |
| 2004 | .id_table = ibmvscsi_device_table, |
| 2005 | .probe = ibmvscsi_probe, |
| 2006 | .remove = ibmvscsi_remove, |
| 2007 | .get_desired_dma = ibmvscsi_get_desired_dma, |
| 2008 | .driver = { |
| 2009 | .name = "ibmvscsi", |
| 2010 | .owner = THIS_MODULE, |
| 2011 | } |
| 2012 | }; |
| 2013 | |
| 2014 | static struct srp_function_template ibmvscsi_transport_functions = { |
| 2015 | }; |
| 2016 | |
| 2017 | int __init ibmvscsi_module_init(void) |
| 2018 | { |
| 2019 | int ret; |
| 2020 | |
| 2021 | /* Ensure we have two requests to do error recovery */ |
| 2022 | driver_template.can_queue = max_requests; |
| 2023 | max_events = max_requests + 2; |
| 2024 | |
| 2025 | if (firmware_has_feature(FW_FEATURE_ISERIES)) |
| 2026 | ibmvscsi_ops = &iseriesvscsi_ops; |
| 2027 | else if (firmware_has_feature(FW_FEATURE_VIO)) |
| 2028 | ibmvscsi_ops = &rpavscsi_ops; |
| 2029 | else |
| 2030 | return -ENODEV; |
| 2031 | |
| 2032 | ibmvscsi_transport_template = |
| 2033 | srp_attach_transport(&ibmvscsi_transport_functions); |
| 2034 | if (!ibmvscsi_transport_template) |
| 2035 | return -ENOMEM; |
| 2036 | |
| 2037 | ret = vio_register_driver(&ibmvscsi_driver); |
| 2038 | if (ret) |
| 2039 | srp_release_transport(ibmvscsi_transport_template); |
| 2040 | return ret; |
| 2041 | } |
| 2042 | |
| 2043 | void __exit ibmvscsi_module_exit(void) |
| 2044 | { |
| 2045 | vio_unregister_driver(&ibmvscsi_driver); |
| 2046 | srp_release_transport(ibmvscsi_transport_template); |
| 2047 | } |
| 2048 | |
| 2049 | module_init(ibmvscsi_module_init); |
| 2050 | module_exit(ibmvscsi_module_exit); |