Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 <asm/vio.h> |
| 74 | #include <scsi/scsi.h> |
| 75 | #include <scsi/scsi_cmnd.h> |
| 76 | #include <scsi/scsi_host.h> |
| 77 | #include <scsi/scsi_device.h> |
| 78 | #include "ibmvscsi.h" |
| 79 | |
| 80 | /* The values below are somewhat arbitrary default values, but |
| 81 | * OS/400 will use 3 busses (disks, CDs, tapes, I think.) |
| 82 | * Note that there are 3 bits of channel value, 6 bits of id, and |
| 83 | * 5 bits of LUN. |
| 84 | */ |
| 85 | static int max_id = 64; |
| 86 | static int max_channel = 3; |
| 87 | static int init_timeout = 5; |
| 88 | static int max_requests = 50; |
| 89 | |
Linda Xie | b4687ca | 2005-06-27 17:01:48 -0500 | [diff] [blame] | 90 | #define IBMVSCSI_VERSION "1.5.6" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
| 92 | MODULE_DESCRIPTION("IBM Virtual SCSI"); |
| 93 | MODULE_AUTHOR("Dave Boutcher"); |
| 94 | MODULE_LICENSE("GPL"); |
| 95 | MODULE_VERSION(IBMVSCSI_VERSION); |
| 96 | |
| 97 | module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR); |
| 98 | MODULE_PARM_DESC(max_id, "Largest ID value for each channel"); |
| 99 | module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); |
| 100 | MODULE_PARM_DESC(max_channel, "Largest channel value"); |
| 101 | module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR); |
| 102 | MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds"); |
| 103 | module_param_named(max_requests, max_requests, int, S_IRUGO | S_IWUSR); |
| 104 | MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter"); |
| 105 | |
| 106 | /* ------------------------------------------------------------ |
| 107 | * Routines for the event pool and event structs |
| 108 | */ |
| 109 | /** |
| 110 | * initialize_event_pool: - Allocates and initializes the event pool for a host |
| 111 | * @pool: event_pool to be initialized |
| 112 | * @size: Number of events in pool |
| 113 | * @hostdata: ibmvscsi_host_data who owns the event pool |
| 114 | * |
| 115 | * Returns zero on success. |
| 116 | */ |
| 117 | static int initialize_event_pool(struct event_pool *pool, |
| 118 | int size, struct ibmvscsi_host_data *hostdata) |
| 119 | { |
| 120 | int i; |
| 121 | |
| 122 | pool->size = size; |
| 123 | pool->next = 0; |
| 124 | pool->events = kmalloc(pool->size * sizeof(*pool->events), GFP_KERNEL); |
| 125 | if (!pool->events) |
| 126 | return -ENOMEM; |
| 127 | memset(pool->events, 0x00, pool->size * sizeof(*pool->events)); |
| 128 | |
| 129 | pool->iu_storage = |
| 130 | dma_alloc_coherent(hostdata->dev, |
| 131 | pool->size * sizeof(*pool->iu_storage), |
| 132 | &pool->iu_token, 0); |
| 133 | if (!pool->iu_storage) { |
| 134 | kfree(pool->events); |
| 135 | return -ENOMEM; |
| 136 | } |
| 137 | |
| 138 | for (i = 0; i < pool->size; ++i) { |
| 139 | struct srp_event_struct *evt = &pool->events[i]; |
| 140 | memset(&evt->crq, 0x00, sizeof(evt->crq)); |
| 141 | atomic_set(&evt->free, 1); |
| 142 | evt->crq.valid = 0x80; |
| 143 | evt->crq.IU_length = sizeof(*evt->xfer_iu); |
| 144 | evt->crq.IU_data_ptr = pool->iu_token + |
| 145 | sizeof(*evt->xfer_iu) * i; |
| 146 | evt->xfer_iu = pool->iu_storage + i; |
| 147 | evt->hostdata = hostdata; |
| 148 | } |
| 149 | |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | /** |
| 154 | * release_event_pool: - Frees memory of an event pool of a host |
| 155 | * @pool: event_pool to be released |
| 156 | * @hostdata: ibmvscsi_host_data who owns the even pool |
| 157 | * |
| 158 | * Returns zero on success. |
| 159 | */ |
| 160 | static void release_event_pool(struct event_pool *pool, |
| 161 | struct ibmvscsi_host_data *hostdata) |
| 162 | { |
| 163 | int i, in_use = 0; |
| 164 | for (i = 0; i < pool->size; ++i) |
| 165 | if (atomic_read(&pool->events[i].free) != 1) |
| 166 | ++in_use; |
| 167 | if (in_use) |
| 168 | printk(KERN_WARNING |
| 169 | "ibmvscsi: releasing event pool with %d " |
| 170 | "events still in use?\n", in_use); |
| 171 | kfree(pool->events); |
| 172 | dma_free_coherent(hostdata->dev, |
| 173 | pool->size * sizeof(*pool->iu_storage), |
| 174 | pool->iu_storage, pool->iu_token); |
| 175 | } |
| 176 | |
| 177 | /** |
| 178 | * valid_event_struct: - Determines if event is valid. |
| 179 | * @pool: event_pool that contains the event |
| 180 | * @evt: srp_event_struct to be checked for validity |
| 181 | * |
| 182 | * Returns zero if event is invalid, one otherwise. |
| 183 | */ |
| 184 | static int valid_event_struct(struct event_pool *pool, |
| 185 | struct srp_event_struct *evt) |
| 186 | { |
| 187 | int index = evt - pool->events; |
| 188 | if (index < 0 || index >= pool->size) /* outside of bounds */ |
| 189 | return 0; |
| 190 | if (evt != pool->events + index) /* unaligned */ |
| 191 | return 0; |
| 192 | return 1; |
| 193 | } |
| 194 | |
| 195 | /** |
| 196 | * ibmvscsi_free-event_struct: - Changes status of event to "free" |
| 197 | * @pool: event_pool that contains the event |
| 198 | * @evt: srp_event_struct to be modified |
| 199 | * |
| 200 | */ |
| 201 | static void free_event_struct(struct event_pool *pool, |
| 202 | struct srp_event_struct *evt) |
| 203 | { |
| 204 | if (!valid_event_struct(pool, evt)) { |
| 205 | printk(KERN_ERR |
| 206 | "ibmvscsi: Freeing invalid event_struct %p " |
| 207 | "(not in pool %p)\n", evt, pool->events); |
| 208 | return; |
| 209 | } |
| 210 | if (atomic_inc_return(&evt->free) != 1) { |
| 211 | printk(KERN_ERR |
| 212 | "ibmvscsi: Freeing event_struct %p " |
| 213 | "which is not in use!\n", evt); |
| 214 | return; |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | /** |
| 219 | * get_evt_struct: - Gets the next free event in pool |
| 220 | * @pool: event_pool that contains the events to be searched |
| 221 | * |
| 222 | * Returns the next event in "free" state, and NULL if none are free. |
| 223 | * Note that no synchronization is done here, we assume the host_lock |
| 224 | * will syncrhonze things. |
| 225 | */ |
| 226 | static struct srp_event_struct *get_event_struct(struct event_pool *pool) |
| 227 | { |
| 228 | int i; |
| 229 | int poolsize = pool->size; |
| 230 | int offset = pool->next; |
| 231 | |
| 232 | for (i = 0; i < poolsize; i++) { |
| 233 | offset = (offset + 1) % poolsize; |
| 234 | if (!atomic_dec_if_positive(&pool->events[offset].free)) { |
| 235 | pool->next = offset; |
| 236 | return &pool->events[offset]; |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); |
| 241 | return NULL; |
| 242 | } |
| 243 | |
| 244 | /** |
| 245 | * init_event_struct: Initialize fields in an event struct that are always |
| 246 | * required. |
| 247 | * @evt: The event |
| 248 | * @done: Routine to call when the event is responded to |
| 249 | * @format: SRP or MAD format |
| 250 | * @timeout: timeout value set in the CRQ |
| 251 | */ |
| 252 | static void init_event_struct(struct srp_event_struct *evt_struct, |
| 253 | void (*done) (struct srp_event_struct *), |
| 254 | u8 format, |
| 255 | int timeout) |
| 256 | { |
| 257 | evt_struct->cmnd = NULL; |
| 258 | evt_struct->cmnd_done = NULL; |
| 259 | evt_struct->sync_srp = NULL; |
| 260 | evt_struct->crq.format = format; |
| 261 | evt_struct->crq.timeout = timeout; |
| 262 | evt_struct->done = done; |
| 263 | } |
| 264 | |
| 265 | /* ------------------------------------------------------------ |
| 266 | * Routines for receiving SCSI responses from the hosting partition |
| 267 | */ |
| 268 | |
| 269 | /** |
| 270 | * set_srp_direction: Set the fields in the srp related to data |
| 271 | * direction and number of buffers based on the direction in |
| 272 | * the scsi_cmnd and the number of buffers |
| 273 | */ |
| 274 | static void set_srp_direction(struct scsi_cmnd *cmd, |
| 275 | struct srp_cmd *srp_cmd, |
| 276 | int numbuf) |
| 277 | { |
| 278 | if (numbuf == 0) |
| 279 | return; |
| 280 | |
| 281 | if (numbuf == 1) { |
| 282 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
| 283 | srp_cmd->data_out_format = SRP_DIRECT_BUFFER; |
| 284 | else |
| 285 | srp_cmd->data_in_format = SRP_DIRECT_BUFFER; |
| 286 | } else { |
| 287 | if (cmd->sc_data_direction == DMA_TO_DEVICE) { |
| 288 | srp_cmd->data_out_format = SRP_INDIRECT_BUFFER; |
| 289 | srp_cmd->data_out_count = numbuf; |
| 290 | } else { |
| 291 | srp_cmd->data_in_format = SRP_INDIRECT_BUFFER; |
| 292 | srp_cmd->data_in_count = numbuf; |
| 293 | } |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | /** |
| 298 | * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format |
| 299 | * @cmd: srp_cmd whose additional_data member will be unmapped |
| 300 | * @dev: device for which the memory is mapped |
| 301 | * |
| 302 | */ |
| 303 | static void unmap_cmd_data(struct srp_cmd *cmd, struct device *dev) |
| 304 | { |
| 305 | int i; |
| 306 | |
| 307 | if ((cmd->data_out_format == SRP_NO_BUFFER) && |
| 308 | (cmd->data_in_format == SRP_NO_BUFFER)) |
| 309 | return; |
| 310 | else if ((cmd->data_out_format == SRP_DIRECT_BUFFER) || |
| 311 | (cmd->data_in_format == SRP_DIRECT_BUFFER)) { |
| 312 | struct memory_descriptor *data = |
| 313 | (struct memory_descriptor *)cmd->additional_data; |
| 314 | dma_unmap_single(dev, data->virtual_address, data->length, |
| 315 | DMA_BIDIRECTIONAL); |
| 316 | } else { |
| 317 | struct indirect_descriptor *indirect = |
| 318 | (struct indirect_descriptor *)cmd->additional_data; |
| 319 | int num_mapped = indirect->head.length / |
| 320 | sizeof(indirect->list[0]); |
| 321 | for (i = 0; i < num_mapped; ++i) { |
| 322 | struct memory_descriptor *data = &indirect->list[i]; |
| 323 | dma_unmap_single(dev, |
| 324 | data->virtual_address, |
| 325 | data->length, DMA_BIDIRECTIONAL); |
| 326 | } |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | /** |
| 331 | * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields |
| 332 | * @cmd: Scsi_Cmnd with the scatterlist |
| 333 | * @srp_cmd: srp_cmd that contains the memory descriptor |
| 334 | * @dev: device for which to map dma memory |
| 335 | * |
| 336 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. |
| 337 | * Returns 1 on success. |
| 338 | */ |
| 339 | static int map_sg_data(struct scsi_cmnd *cmd, |
| 340 | struct srp_cmd *srp_cmd, struct device *dev) |
| 341 | { |
| 342 | |
| 343 | int i, sg_mapped; |
| 344 | u64 total_length = 0; |
| 345 | struct scatterlist *sg = cmd->request_buffer; |
| 346 | struct memory_descriptor *data = |
| 347 | (struct memory_descriptor *)srp_cmd->additional_data; |
| 348 | struct indirect_descriptor *indirect = |
| 349 | (struct indirect_descriptor *)data; |
| 350 | |
| 351 | sg_mapped = dma_map_sg(dev, sg, cmd->use_sg, DMA_BIDIRECTIONAL); |
| 352 | |
| 353 | if (sg_mapped == 0) |
| 354 | return 0; |
| 355 | |
| 356 | set_srp_direction(cmd, srp_cmd, sg_mapped); |
| 357 | |
| 358 | /* special case; we can use a single direct descriptor */ |
| 359 | if (sg_mapped == 1) { |
| 360 | data->virtual_address = sg_dma_address(&sg[0]); |
| 361 | data->length = sg_dma_len(&sg[0]); |
| 362 | data->memory_handle = 0; |
| 363 | return 1; |
| 364 | } |
| 365 | |
| 366 | if (sg_mapped > MAX_INDIRECT_BUFS) { |
| 367 | printk(KERN_ERR |
| 368 | "ibmvscsi: More than %d mapped sg entries, got %d\n", |
| 369 | MAX_INDIRECT_BUFS, sg_mapped); |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | indirect->head.virtual_address = 0; |
| 374 | indirect->head.length = sg_mapped * sizeof(indirect->list[0]); |
| 375 | indirect->head.memory_handle = 0; |
| 376 | for (i = 0; i < sg_mapped; ++i) { |
| 377 | struct memory_descriptor *descr = &indirect->list[i]; |
| 378 | struct scatterlist *sg_entry = &sg[i]; |
| 379 | descr->virtual_address = sg_dma_address(sg_entry); |
| 380 | descr->length = sg_dma_len(sg_entry); |
| 381 | descr->memory_handle = 0; |
| 382 | total_length += sg_dma_len(sg_entry); |
| 383 | } |
| 384 | indirect->total_length = total_length; |
| 385 | |
| 386 | return 1; |
| 387 | } |
| 388 | |
| 389 | /** |
| 390 | * map_single_data: - Maps memory and initializes memory decriptor fields |
| 391 | * @cmd: struct scsi_cmnd with the memory to be mapped |
| 392 | * @srp_cmd: srp_cmd that contains the memory descriptor |
| 393 | * @dev: device for which to map dma memory |
| 394 | * |
| 395 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. |
| 396 | * Returns 1 on success. |
| 397 | */ |
| 398 | static int map_single_data(struct scsi_cmnd *cmd, |
| 399 | struct srp_cmd *srp_cmd, struct device *dev) |
| 400 | { |
| 401 | struct memory_descriptor *data = |
| 402 | (struct memory_descriptor *)srp_cmd->additional_data; |
| 403 | |
| 404 | data->virtual_address = |
| 405 | dma_map_single(dev, cmd->request_buffer, |
| 406 | cmd->request_bufflen, |
| 407 | DMA_BIDIRECTIONAL); |
| 408 | if (dma_mapping_error(data->virtual_address)) { |
| 409 | printk(KERN_ERR |
| 410 | "ibmvscsi: Unable to map request_buffer for command!\n"); |
| 411 | return 0; |
| 412 | } |
| 413 | data->length = cmd->request_bufflen; |
| 414 | data->memory_handle = 0; |
| 415 | |
| 416 | set_srp_direction(cmd, srp_cmd, 1); |
| 417 | |
| 418 | return 1; |
| 419 | } |
| 420 | |
| 421 | /** |
| 422 | * map_data_for_srp_cmd: - Calls functions to map data for srp cmds |
| 423 | * @cmd: struct scsi_cmnd with the memory to be mapped |
| 424 | * @srp_cmd: srp_cmd that contains the memory descriptor |
| 425 | * @dev: dma device for which to map dma memory |
| 426 | * |
| 427 | * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds |
| 428 | * Returns 1 on success. |
| 429 | */ |
| 430 | static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, |
| 431 | struct srp_cmd *srp_cmd, struct device *dev) |
| 432 | { |
| 433 | switch (cmd->sc_data_direction) { |
| 434 | case DMA_FROM_DEVICE: |
| 435 | case DMA_TO_DEVICE: |
| 436 | break; |
| 437 | case DMA_NONE: |
| 438 | return 1; |
| 439 | case DMA_BIDIRECTIONAL: |
| 440 | printk(KERN_ERR |
| 441 | "ibmvscsi: Can't map DMA_BIDIRECTIONAL to read/write\n"); |
| 442 | return 0; |
| 443 | default: |
| 444 | printk(KERN_ERR |
| 445 | "ibmvscsi: Unknown data direction 0x%02x; can't map!\n", |
| 446 | cmd->sc_data_direction); |
| 447 | return 0; |
| 448 | } |
| 449 | |
| 450 | if (!cmd->request_buffer) |
| 451 | return 1; |
| 452 | if (cmd->use_sg) |
| 453 | return map_sg_data(cmd, srp_cmd, dev); |
| 454 | return map_single_data(cmd, srp_cmd, dev); |
| 455 | } |
| 456 | |
| 457 | /* ------------------------------------------------------------ |
| 458 | * Routines for sending and receiving SRPs |
| 459 | */ |
| 460 | /** |
| 461 | * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() |
| 462 | * @evt_struct: evt_struct to be sent |
| 463 | * @hostdata: ibmvscsi_host_data of host |
| 464 | * |
| 465 | * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) |
| 466 | * Note that this routine assumes that host_lock is held for synchronization |
| 467 | */ |
| 468 | static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, |
| 469 | struct ibmvscsi_host_data *hostdata) |
| 470 | { |
| 471 | struct scsi_cmnd *cmnd; |
| 472 | u64 *crq_as_u64 = (u64 *) &evt_struct->crq; |
| 473 | int rc; |
| 474 | |
| 475 | /* If we have exhausted our request limit, just fail this request. |
| 476 | * Note that there are rare cases involving driver generated requests |
| 477 | * (such as task management requests) that the mid layer may think we |
| 478 | * can handle more requests (can_queue) when we actually can't |
| 479 | */ |
| 480 | if ((evt_struct->crq.format == VIOSRP_SRP_FORMAT) && |
| 481 | (atomic_dec_if_positive(&hostdata->request_limit) < 0)) { |
| 482 | /* See if the adapter is disabled */ |
| 483 | if (atomic_read(&hostdata->request_limit) < 0) |
| 484 | goto send_error; |
| 485 | |
| 486 | printk(KERN_WARNING |
| 487 | "ibmvscsi: Warning, request_limit exceeded\n"); |
| 488 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
| 489 | hostdata->dev); |
| 490 | free_event_struct(&hostdata->pool, evt_struct); |
| 491 | return SCSI_MLQUEUE_HOST_BUSY; |
| 492 | } |
| 493 | |
| 494 | /* Copy the IU into the transfer area */ |
| 495 | *evt_struct->xfer_iu = evt_struct->iu; |
| 496 | evt_struct->xfer_iu->srp.generic.tag = (u64)evt_struct; |
| 497 | |
| 498 | /* Add this to the sent list. We need to do this |
| 499 | * before we actually send |
| 500 | * in case it comes back REALLY fast |
| 501 | */ |
| 502 | list_add_tail(&evt_struct->list, &hostdata->sent); |
| 503 | |
| 504 | if ((rc = |
| 505 | ibmvscsi_send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) { |
| 506 | list_del(&evt_struct->list); |
| 507 | |
| 508 | printk(KERN_ERR "ibmvscsi: failed to send event struct rc %d\n", |
| 509 | rc); |
| 510 | goto send_error; |
| 511 | } |
| 512 | |
| 513 | return 0; |
| 514 | |
| 515 | send_error: |
| 516 | unmap_cmd_data(&evt_struct->iu.srp.cmd, hostdata->dev); |
| 517 | |
| 518 | if ((cmnd = evt_struct->cmnd) != NULL) { |
| 519 | cmnd->result = DID_ERROR << 16; |
| 520 | evt_struct->cmnd_done(cmnd); |
| 521 | } else if (evt_struct->done) |
| 522 | evt_struct->done(evt_struct); |
| 523 | |
| 524 | free_event_struct(&hostdata->pool, evt_struct); |
| 525 | return 0; |
| 526 | } |
| 527 | |
| 528 | /** |
| 529 | * handle_cmd_rsp: - Handle responses from commands |
| 530 | * @evt_struct: srp_event_struct to be handled |
| 531 | * |
| 532 | * Used as a callback by when sending scsi cmds. |
| 533 | * Gets called by ibmvscsi_handle_crq() |
| 534 | */ |
| 535 | static void handle_cmd_rsp(struct srp_event_struct *evt_struct) |
| 536 | { |
| 537 | struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; |
| 538 | struct scsi_cmnd *cmnd = evt_struct->cmnd; |
| 539 | |
| 540 | if (unlikely(rsp->type != SRP_RSP_TYPE)) { |
| 541 | if (printk_ratelimit()) |
| 542 | printk(KERN_WARNING |
| 543 | "ibmvscsi: bad SRP RSP type %d\n", |
| 544 | rsp->type); |
| 545 | } |
| 546 | |
| 547 | if (cmnd) { |
| 548 | cmnd->result = rsp->status; |
| 549 | if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) |
| 550 | memcpy(cmnd->sense_buffer, |
| 551 | rsp->sense_and_response_data, |
| 552 | rsp->sense_data_list_length); |
| 553 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
| 554 | evt_struct->hostdata->dev); |
| 555 | |
| 556 | if (rsp->doover) |
| 557 | cmnd->resid = rsp->data_out_residual_count; |
| 558 | else if (rsp->diover) |
| 559 | cmnd->resid = rsp->data_in_residual_count; |
| 560 | } |
| 561 | |
| 562 | if (evt_struct->cmnd_done) |
| 563 | evt_struct->cmnd_done(cmnd); |
| 564 | } |
| 565 | |
| 566 | /** |
| 567 | * lun_from_dev: - Returns the lun of the scsi device |
| 568 | * @dev: struct scsi_device |
| 569 | * |
| 570 | */ |
| 571 | static inline u16 lun_from_dev(struct scsi_device *dev) |
| 572 | { |
| 573 | return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; |
| 574 | } |
| 575 | |
| 576 | /** |
| 577 | * ibmvscsi_queue: - The queuecommand function of the scsi template |
| 578 | * @cmd: struct scsi_cmnd to be executed |
| 579 | * @done: Callback function to be called when cmd is completed |
| 580 | */ |
| 581 | static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd, |
| 582 | void (*done) (struct scsi_cmnd *)) |
| 583 | { |
| 584 | struct srp_cmd *srp_cmd; |
| 585 | struct srp_event_struct *evt_struct; |
| 586 | struct ibmvscsi_host_data *hostdata = |
| 587 | (struct ibmvscsi_host_data *)&cmnd->device->host->hostdata; |
| 588 | u16 lun = lun_from_dev(cmnd->device); |
| 589 | |
| 590 | evt_struct = get_event_struct(&hostdata->pool); |
| 591 | if (!evt_struct) |
| 592 | return SCSI_MLQUEUE_HOST_BUSY; |
| 593 | |
| 594 | init_event_struct(evt_struct, |
| 595 | handle_cmd_rsp, |
| 596 | VIOSRP_SRP_FORMAT, |
| 597 | cmnd->timeout); |
| 598 | |
| 599 | evt_struct->cmnd = cmnd; |
| 600 | evt_struct->cmnd_done = done; |
| 601 | |
| 602 | /* Set up the actual SRP IU */ |
| 603 | srp_cmd = &evt_struct->iu.srp.cmd; |
| 604 | memset(srp_cmd, 0x00, sizeof(*srp_cmd)); |
| 605 | srp_cmd->type = SRP_CMD_TYPE; |
| 606 | memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(cmnd->cmnd)); |
| 607 | srp_cmd->lun = ((u64) lun) << 48; |
| 608 | |
| 609 | if (!map_data_for_srp_cmd(cmnd, srp_cmd, hostdata->dev)) { |
| 610 | printk(KERN_ERR "ibmvscsi: couldn't convert cmd to srp_cmd\n"); |
| 611 | free_event_struct(&hostdata->pool, evt_struct); |
| 612 | return SCSI_MLQUEUE_HOST_BUSY; |
| 613 | } |
| 614 | |
| 615 | /* Fix up dma address of the buffer itself */ |
| 616 | if ((srp_cmd->data_out_format == SRP_INDIRECT_BUFFER) || |
| 617 | (srp_cmd->data_in_format == SRP_INDIRECT_BUFFER)) { |
| 618 | struct indirect_descriptor *indirect = |
| 619 | (struct indirect_descriptor *)srp_cmd->additional_data; |
| 620 | indirect->head.virtual_address = evt_struct->crq.IU_data_ptr + |
| 621 | offsetof(struct srp_cmd, additional_data) + |
| 622 | offsetof(struct indirect_descriptor, list); |
| 623 | } |
| 624 | |
| 625 | return ibmvscsi_send_srp_event(evt_struct, hostdata); |
| 626 | } |
| 627 | |
| 628 | /* ------------------------------------------------------------ |
| 629 | * Routines for driver initialization |
| 630 | */ |
| 631 | /** |
| 632 | * adapter_info_rsp: - Handle response to MAD adapter info request |
| 633 | * @evt_struct: srp_event_struct with the response |
| 634 | * |
| 635 | * Used as a "done" callback by when sending adapter_info. Gets called |
| 636 | * by ibmvscsi_handle_crq() |
| 637 | */ |
| 638 | static void adapter_info_rsp(struct srp_event_struct *evt_struct) |
| 639 | { |
| 640 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; |
| 641 | dma_unmap_single(hostdata->dev, |
| 642 | evt_struct->iu.mad.adapter_info.buffer, |
| 643 | evt_struct->iu.mad.adapter_info.common.length, |
| 644 | DMA_BIDIRECTIONAL); |
| 645 | |
| 646 | if (evt_struct->xfer_iu->mad.adapter_info.common.status) { |
| 647 | printk("ibmvscsi: error %d getting adapter info\n", |
| 648 | evt_struct->xfer_iu->mad.adapter_info.common.status); |
| 649 | } else { |
| 650 | printk("ibmvscsi: host srp version: %s, " |
| 651 | "host partition %s (%d), OS %d, max io %u\n", |
| 652 | hostdata->madapter_info.srp_version, |
| 653 | hostdata->madapter_info.partition_name, |
| 654 | hostdata->madapter_info.partition_number, |
| 655 | hostdata->madapter_info.os_type, |
| 656 | hostdata->madapter_info.port_max_txu[0]); |
| 657 | |
| 658 | if (hostdata->madapter_info.port_max_txu[0]) |
| 659 | hostdata->host->max_sectors = |
| 660 | hostdata->madapter_info.port_max_txu[0] >> 9; |
| 661 | } |
| 662 | } |
| 663 | |
| 664 | /** |
| 665 | * send_mad_adapter_info: - Sends the mad adapter info request |
| 666 | * and stores the result so it can be retrieved with |
| 667 | * sysfs. We COULD consider causing a failure if the |
| 668 | * returned SRP version doesn't match ours. |
| 669 | * @hostdata: ibmvscsi_host_data of host |
| 670 | * |
| 671 | * Returns zero if successful. |
| 672 | */ |
| 673 | static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) |
| 674 | { |
| 675 | struct viosrp_adapter_info *req; |
| 676 | struct srp_event_struct *evt_struct; |
| 677 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | evt_struct = get_event_struct(&hostdata->pool); |
| 679 | if (!evt_struct) { |
| 680 | printk(KERN_ERR "ibmvscsi: couldn't allocate an event " |
| 681 | "for ADAPTER_INFO_REQ!\n"); |
| 682 | return; |
| 683 | } |
| 684 | |
| 685 | init_event_struct(evt_struct, |
| 686 | adapter_info_rsp, |
| 687 | VIOSRP_MAD_FORMAT, |
| 688 | init_timeout * HZ); |
| 689 | |
| 690 | req = &evt_struct->iu.mad.adapter_info; |
| 691 | memset(req, 0x00, sizeof(*req)); |
| 692 | |
| 693 | req->common.type = VIOSRP_ADAPTER_INFO_TYPE; |
| 694 | req->common.length = sizeof(hostdata->madapter_info); |
| 695 | req->buffer = dma_map_single(hostdata->dev, |
| 696 | &hostdata->madapter_info, |
| 697 | sizeof(hostdata->madapter_info), |
| 698 | DMA_BIDIRECTIONAL); |
| 699 | |
| 700 | if (dma_mapping_error(req->buffer)) { |
| 701 | printk(KERN_ERR |
| 702 | "ibmvscsi: Unable to map request_buffer " |
| 703 | "for adapter_info!\n"); |
| 704 | free_event_struct(&hostdata->pool, evt_struct); |
| 705 | return; |
| 706 | } |
| 707 | |
| 708 | if (ibmvscsi_send_srp_event(evt_struct, hostdata)) |
| 709 | printk(KERN_ERR "ibmvscsi: couldn't send ADAPTER_INFO_REQ!\n"); |
| 710 | }; |
| 711 | |
| 712 | /** |
| 713 | * login_rsp: - Handle response to SRP login request |
| 714 | * @evt_struct: srp_event_struct with the response |
| 715 | * |
| 716 | * Used as a "done" callback by when sending srp_login. Gets called |
| 717 | * by ibmvscsi_handle_crq() |
| 718 | */ |
| 719 | static void login_rsp(struct srp_event_struct *evt_struct) |
| 720 | { |
| 721 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; |
| 722 | switch (evt_struct->xfer_iu->srp.generic.type) { |
| 723 | case SRP_LOGIN_RSP_TYPE: /* it worked! */ |
| 724 | break; |
| 725 | case SRP_LOGIN_REJ_TYPE: /* refused! */ |
| 726 | printk(KERN_INFO "ibmvscsi: SRP_LOGIN_REQ rejected\n"); |
| 727 | /* Login failed. */ |
| 728 | atomic_set(&hostdata->request_limit, -1); |
| 729 | return; |
| 730 | default: |
| 731 | printk(KERN_ERR |
| 732 | "ibmvscsi: Invalid login response typecode 0x%02x!\n", |
| 733 | evt_struct->xfer_iu->srp.generic.type); |
| 734 | /* Login failed. */ |
| 735 | atomic_set(&hostdata->request_limit, -1); |
| 736 | return; |
| 737 | } |
| 738 | |
| 739 | printk(KERN_INFO "ibmvscsi: SRP_LOGIN succeeded\n"); |
| 740 | |
| 741 | if (evt_struct->xfer_iu->srp.login_rsp.request_limit_delta > |
| 742 | (max_requests - 2)) |
| 743 | evt_struct->xfer_iu->srp.login_rsp.request_limit_delta = |
| 744 | max_requests - 2; |
| 745 | |
| 746 | /* Now we know what the real request-limit is */ |
| 747 | atomic_set(&hostdata->request_limit, |
| 748 | evt_struct->xfer_iu->srp.login_rsp.request_limit_delta); |
| 749 | |
| 750 | hostdata->host->can_queue = |
| 751 | evt_struct->xfer_iu->srp.login_rsp.request_limit_delta - 2; |
| 752 | |
| 753 | if (hostdata->host->can_queue < 1) { |
| 754 | printk(KERN_ERR "ibmvscsi: Invalid request_limit_delta\n"); |
| 755 | return; |
| 756 | } |
| 757 | |
| 758 | send_mad_adapter_info(hostdata); |
| 759 | return; |
| 760 | } |
| 761 | |
| 762 | /** |
| 763 | * send_srp_login: - Sends the srp login |
| 764 | * @hostdata: ibmvscsi_host_data of host |
| 765 | * |
| 766 | * Returns zero if successful. |
| 767 | */ |
| 768 | static int send_srp_login(struct ibmvscsi_host_data *hostdata) |
| 769 | { |
| 770 | int rc; |
| 771 | unsigned long flags; |
| 772 | struct srp_login_req *login; |
| 773 | struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); |
| 774 | if (!evt_struct) { |
| 775 | printk(KERN_ERR |
| 776 | "ibmvscsi: couldn't allocate an event for login req!\n"); |
| 777 | return FAILED; |
| 778 | } |
| 779 | |
| 780 | init_event_struct(evt_struct, |
| 781 | login_rsp, |
| 782 | VIOSRP_SRP_FORMAT, |
| 783 | init_timeout * HZ); |
| 784 | |
| 785 | login = &evt_struct->iu.srp.login_req; |
| 786 | login->type = SRP_LOGIN_REQ_TYPE; |
| 787 | login->max_requested_initiator_to_target_iulen = sizeof(union srp_iu); |
| 788 | login->required_buffer_formats = 0x0006; |
| 789 | |
| 790 | /* Start out with a request limit of 1, since this is negotiated in |
| 791 | * the login request we are just sending |
| 792 | */ |
| 793 | atomic_set(&hostdata->request_limit, 1); |
| 794 | |
| 795 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
| 796 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata); |
| 797 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 798 | return rc; |
| 799 | }; |
| 800 | |
| 801 | /** |
| 802 | * sync_completion: Signal that a synchronous command has completed |
| 803 | * Note that after returning from this call, the evt_struct is freed. |
| 804 | * the caller waiting on this completion shouldn't touch the evt_struct |
| 805 | * again. |
| 806 | */ |
| 807 | static void sync_completion(struct srp_event_struct *evt_struct) |
| 808 | { |
| 809 | /* copy the response back */ |
| 810 | if (evt_struct->sync_srp) |
| 811 | *evt_struct->sync_srp = *evt_struct->xfer_iu; |
| 812 | |
| 813 | complete(&evt_struct->comp); |
| 814 | } |
| 815 | |
| 816 | /** |
| 817 | * ibmvscsi_abort: Abort a command...from scsi host template |
| 818 | * send this over to the server and wait synchronously for the response |
| 819 | */ |
| 820 | static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) |
| 821 | { |
| 822 | struct ibmvscsi_host_data *hostdata = |
| 823 | (struct ibmvscsi_host_data *)cmd->device->host->hostdata; |
| 824 | struct srp_tsk_mgmt *tsk_mgmt; |
| 825 | struct srp_event_struct *evt; |
| 826 | struct srp_event_struct *tmp_evt, *found_evt; |
| 827 | union viosrp_iu srp_rsp; |
| 828 | int rsp_rc; |
| 829 | u16 lun = lun_from_dev(cmd->device); |
| 830 | |
| 831 | /* First, find this command in our sent list so we can figure |
| 832 | * out the correct tag |
| 833 | */ |
| 834 | found_evt = NULL; |
| 835 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { |
| 836 | if (tmp_evt->cmnd == cmd) { |
| 837 | found_evt = tmp_evt; |
| 838 | break; |
| 839 | } |
| 840 | } |
| 841 | |
| 842 | if (!found_evt) |
| 843 | return FAILED; |
| 844 | |
| 845 | evt = get_event_struct(&hostdata->pool); |
| 846 | if (evt == NULL) { |
| 847 | printk(KERN_ERR "ibmvscsi: failed to allocate abort event\n"); |
| 848 | return FAILED; |
| 849 | } |
| 850 | |
| 851 | init_event_struct(evt, |
| 852 | sync_completion, |
| 853 | VIOSRP_SRP_FORMAT, |
| 854 | init_timeout * HZ); |
| 855 | |
| 856 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
| 857 | |
| 858 | /* Set up an abort SRP command */ |
| 859 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); |
| 860 | tsk_mgmt->type = SRP_TSK_MGMT_TYPE; |
| 861 | tsk_mgmt->lun = ((u64) lun) << 48; |
| 862 | tsk_mgmt->task_mgmt_flags = 0x01; /* ABORT TASK */ |
| 863 | tsk_mgmt->managed_task_tag = (u64) found_evt; |
| 864 | |
| 865 | printk(KERN_INFO "ibmvscsi: aborting command. lun 0x%lx, tag 0x%lx\n", |
| 866 | tsk_mgmt->lun, tsk_mgmt->managed_task_tag); |
| 867 | |
| 868 | evt->sync_srp = &srp_rsp; |
| 869 | init_completion(&evt->comp); |
| 870 | if (ibmvscsi_send_srp_event(evt, hostdata) != 0) { |
| 871 | printk(KERN_ERR "ibmvscsi: failed to send abort() event\n"); |
| 872 | return FAILED; |
| 873 | } |
| 874 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | wait_for_completion(&evt->comp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | |
| 877 | /* make sure we got a good response */ |
| 878 | if (unlikely(srp_rsp.srp.generic.type != SRP_RSP_TYPE)) { |
| 879 | if (printk_ratelimit()) |
| 880 | printk(KERN_WARNING |
| 881 | "ibmvscsi: abort bad SRP RSP type %d\n", |
| 882 | srp_rsp.srp.generic.type); |
| 883 | return FAILED; |
| 884 | } |
| 885 | |
| 886 | if (srp_rsp.srp.rsp.rspvalid) |
| 887 | rsp_rc = *((int *)srp_rsp.srp.rsp.sense_and_response_data); |
| 888 | else |
| 889 | rsp_rc = srp_rsp.srp.rsp.status; |
| 890 | |
| 891 | if (rsp_rc) { |
| 892 | if (printk_ratelimit()) |
| 893 | printk(KERN_WARNING |
| 894 | "ibmvscsi: abort code %d for task tag 0x%lx\n", |
| 895 | rsp_rc, |
| 896 | tsk_mgmt->managed_task_tag); |
| 897 | return FAILED; |
| 898 | } |
| 899 | |
| 900 | /* Because we dropped the spinlock above, it's possible |
| 901 | * The event is no longer in our list. Make sure it didn't |
| 902 | * complete while we were aborting |
| 903 | */ |
| 904 | found_evt = NULL; |
| 905 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { |
| 906 | if (tmp_evt->cmnd == cmd) { |
| 907 | found_evt = tmp_evt; |
| 908 | break; |
| 909 | } |
| 910 | } |
| 911 | |
| 912 | if (found_evt == NULL) { |
| 913 | printk(KERN_INFO |
| 914 | "ibmvscsi: aborted task tag 0x%lx completed\n", |
| 915 | tsk_mgmt->managed_task_tag); |
| 916 | return SUCCESS; |
| 917 | } |
| 918 | |
| 919 | printk(KERN_INFO |
| 920 | "ibmvscsi: successfully aborted task tag 0x%lx\n", |
| 921 | tsk_mgmt->managed_task_tag); |
| 922 | |
| 923 | cmd->result = (DID_ABORT << 16); |
| 924 | list_del(&found_evt->list); |
| 925 | unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt->hostdata->dev); |
| 926 | free_event_struct(&found_evt->hostdata->pool, found_evt); |
| 927 | atomic_inc(&hostdata->request_limit); |
| 928 | return SUCCESS; |
| 929 | } |
| 930 | |
| 931 | /** |
| 932 | * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host |
| 933 | * template send this over to the server and wait synchronously for the |
| 934 | * response |
| 935 | */ |
| 936 | static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) |
| 937 | { |
| 938 | struct ibmvscsi_host_data *hostdata = |
| 939 | (struct ibmvscsi_host_data *)cmd->device->host->hostdata; |
| 940 | |
| 941 | struct srp_tsk_mgmt *tsk_mgmt; |
| 942 | struct srp_event_struct *evt; |
| 943 | struct srp_event_struct *tmp_evt, *pos; |
| 944 | union viosrp_iu srp_rsp; |
| 945 | int rsp_rc; |
| 946 | u16 lun = lun_from_dev(cmd->device); |
| 947 | |
| 948 | evt = get_event_struct(&hostdata->pool); |
| 949 | if (evt == NULL) { |
| 950 | printk(KERN_ERR "ibmvscsi: failed to allocate reset event\n"); |
| 951 | return FAILED; |
| 952 | } |
| 953 | |
| 954 | init_event_struct(evt, |
| 955 | sync_completion, |
| 956 | VIOSRP_SRP_FORMAT, |
| 957 | init_timeout * HZ); |
| 958 | |
| 959 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
| 960 | |
| 961 | /* Set up a lun reset SRP command */ |
| 962 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); |
| 963 | tsk_mgmt->type = SRP_TSK_MGMT_TYPE; |
| 964 | tsk_mgmt->lun = ((u64) lun) << 48; |
| 965 | tsk_mgmt->task_mgmt_flags = 0x08; /* LUN RESET */ |
| 966 | |
| 967 | printk(KERN_INFO "ibmvscsi: resetting device. lun 0x%lx\n", |
| 968 | tsk_mgmt->lun); |
| 969 | |
| 970 | evt->sync_srp = &srp_rsp; |
| 971 | init_completion(&evt->comp); |
| 972 | if (ibmvscsi_send_srp_event(evt, hostdata) != 0) { |
| 973 | printk(KERN_ERR "ibmvscsi: failed to send reset event\n"); |
| 974 | return FAILED; |
| 975 | } |
| 976 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | wait_for_completion(&evt->comp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | |
| 979 | /* make sure we got a good response */ |
| 980 | if (unlikely(srp_rsp.srp.generic.type != SRP_RSP_TYPE)) { |
| 981 | if (printk_ratelimit()) |
| 982 | printk(KERN_WARNING |
| 983 | "ibmvscsi: reset bad SRP RSP type %d\n", |
| 984 | srp_rsp.srp.generic.type); |
| 985 | return FAILED; |
| 986 | } |
| 987 | |
| 988 | if (srp_rsp.srp.rsp.rspvalid) |
| 989 | rsp_rc = *((int *)srp_rsp.srp.rsp.sense_and_response_data); |
| 990 | else |
| 991 | rsp_rc = srp_rsp.srp.rsp.status; |
| 992 | |
| 993 | if (rsp_rc) { |
| 994 | if (printk_ratelimit()) |
| 995 | printk(KERN_WARNING |
| 996 | "ibmvscsi: reset code %d for task tag 0x%lx\n", |
| 997 | rsp_rc, |
| 998 | tsk_mgmt->managed_task_tag); |
| 999 | return FAILED; |
| 1000 | } |
| 1001 | |
| 1002 | /* We need to find all commands for this LUN that have not yet been |
| 1003 | * responded to, and fail them with DID_RESET |
| 1004 | */ |
| 1005 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
| 1006 | if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { |
| 1007 | if (tmp_evt->cmnd) |
| 1008 | tmp_evt->cmnd->result = (DID_RESET << 16); |
| 1009 | list_del(&tmp_evt->list); |
| 1010 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt->hostdata->dev); |
| 1011 | free_event_struct(&tmp_evt->hostdata->pool, |
| 1012 | tmp_evt); |
| 1013 | atomic_inc(&hostdata->request_limit); |
| 1014 | if (tmp_evt->cmnd_done) |
| 1015 | tmp_evt->cmnd_done(tmp_evt->cmnd); |
| 1016 | else if (tmp_evt->done) |
| 1017 | tmp_evt->done(tmp_evt); |
| 1018 | } |
| 1019 | } |
| 1020 | return SUCCESS; |
| 1021 | } |
| 1022 | |
| 1023 | /** |
| 1024 | * purge_requests: Our virtual adapter just shut down. purge any sent requests |
| 1025 | * @hostdata: the adapter |
| 1026 | */ |
| 1027 | static void purge_requests(struct ibmvscsi_host_data *hostdata) |
| 1028 | { |
| 1029 | struct srp_event_struct *tmp_evt, *pos; |
| 1030 | unsigned long flags; |
| 1031 | |
| 1032 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
| 1033 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
| 1034 | list_del(&tmp_evt->list); |
| 1035 | if (tmp_evt->cmnd) { |
| 1036 | tmp_evt->cmnd->result = (DID_ERROR << 16); |
| 1037 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, |
| 1038 | tmp_evt->hostdata->dev); |
| 1039 | if (tmp_evt->cmnd_done) |
| 1040 | tmp_evt->cmnd_done(tmp_evt->cmnd); |
| 1041 | } else { |
| 1042 | if (tmp_evt->done) { |
| 1043 | tmp_evt->done(tmp_evt); |
| 1044 | } |
| 1045 | } |
| 1046 | free_event_struct(&tmp_evt->hostdata->pool, tmp_evt); |
| 1047 | } |
| 1048 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1049 | } |
| 1050 | |
| 1051 | /** |
| 1052 | * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ |
| 1053 | * @crq: Command/Response queue |
| 1054 | * @hostdata: ibmvscsi_host_data of host |
| 1055 | * |
| 1056 | */ |
| 1057 | void ibmvscsi_handle_crq(struct viosrp_crq *crq, |
| 1058 | struct ibmvscsi_host_data *hostdata) |
| 1059 | { |
| 1060 | unsigned long flags; |
| 1061 | struct srp_event_struct *evt_struct = |
| 1062 | (struct srp_event_struct *)crq->IU_data_ptr; |
| 1063 | switch (crq->valid) { |
| 1064 | case 0xC0: /* initialization */ |
| 1065 | switch (crq->format) { |
| 1066 | case 0x01: /* Initialization message */ |
| 1067 | printk(KERN_INFO "ibmvscsi: partner initialized\n"); |
| 1068 | /* Send back a response */ |
| 1069 | if (ibmvscsi_send_crq(hostdata, |
| 1070 | 0xC002000000000000LL, 0) == 0) { |
| 1071 | /* Now login */ |
| 1072 | send_srp_login(hostdata); |
| 1073 | } else { |
| 1074 | printk(KERN_ERR |
| 1075 | "ibmvscsi: Unable to send init rsp\n"); |
| 1076 | } |
| 1077 | |
| 1078 | break; |
| 1079 | case 0x02: /* Initialization response */ |
| 1080 | printk(KERN_INFO |
| 1081 | "ibmvscsi: partner initialization complete\n"); |
| 1082 | |
| 1083 | /* Now login */ |
| 1084 | send_srp_login(hostdata); |
| 1085 | break; |
| 1086 | default: |
| 1087 | printk(KERN_ERR "ibmvscsi: unknown crq message type\n"); |
| 1088 | } |
| 1089 | return; |
| 1090 | case 0xFF: /* Hypervisor telling us the connection is closed */ |
| 1091 | printk(KERN_INFO "ibmvscsi: Virtual adapter failed!\n"); |
| 1092 | |
| 1093 | atomic_set(&hostdata->request_limit, -1); |
| 1094 | purge_requests(hostdata); |
| 1095 | ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata); |
| 1096 | return; |
| 1097 | case 0x80: /* real payload */ |
| 1098 | break; |
| 1099 | default: |
| 1100 | printk(KERN_ERR |
| 1101 | "ibmvscsi: got an invalid message type 0x%02x\n", |
| 1102 | crq->valid); |
| 1103 | return; |
| 1104 | } |
| 1105 | |
| 1106 | /* The only kind of payload CRQs we should get are responses to |
| 1107 | * things we send. Make sure this response is to something we |
| 1108 | * actually sent |
| 1109 | */ |
| 1110 | if (!valid_event_struct(&hostdata->pool, evt_struct)) { |
| 1111 | printk(KERN_ERR |
| 1112 | "ibmvscsi: returned correlation_token 0x%p is invalid!\n", |
| 1113 | (void *)crq->IU_data_ptr); |
| 1114 | return; |
| 1115 | } |
| 1116 | |
| 1117 | if (atomic_read(&evt_struct->free)) { |
| 1118 | printk(KERN_ERR |
| 1119 | "ibmvscsi: received duplicate correlation_token 0x%p!\n", |
| 1120 | (void *)crq->IU_data_ptr); |
| 1121 | return; |
| 1122 | } |
| 1123 | |
| 1124 | if (crq->format == VIOSRP_SRP_FORMAT) |
| 1125 | atomic_add(evt_struct->xfer_iu->srp.rsp.request_limit_delta, |
| 1126 | &hostdata->request_limit); |
| 1127 | |
| 1128 | if (evt_struct->done) |
| 1129 | evt_struct->done(evt_struct); |
| 1130 | else |
| 1131 | printk(KERN_ERR |
| 1132 | "ibmvscsi: returned done() is NULL; not running it!\n"); |
| 1133 | |
| 1134 | /* |
| 1135 | * Lock the host_lock before messing with these structures, since we |
| 1136 | * are running in a task context |
| 1137 | */ |
| 1138 | spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); |
| 1139 | list_del(&evt_struct->list); |
| 1140 | free_event_struct(&evt_struct->hostdata->pool, evt_struct); |
| 1141 | spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); |
| 1142 | } |
| 1143 | |
| 1144 | /** |
| 1145 | * ibmvscsi_get_host_config: Send the command to the server to get host |
| 1146 | * configuration data. The data is opaque to us. |
| 1147 | */ |
| 1148 | static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata, |
| 1149 | unsigned char *buffer, int length) |
| 1150 | { |
| 1151 | struct viosrp_host_config *host_config; |
| 1152 | struct srp_event_struct *evt_struct; |
| 1153 | int rc; |
| 1154 | |
| 1155 | evt_struct = get_event_struct(&hostdata->pool); |
| 1156 | if (!evt_struct) { |
| 1157 | printk(KERN_ERR |
| 1158 | "ibmvscsi: could't allocate event for HOST_CONFIG!\n"); |
| 1159 | return -1; |
| 1160 | } |
| 1161 | |
| 1162 | init_event_struct(evt_struct, |
| 1163 | sync_completion, |
| 1164 | VIOSRP_MAD_FORMAT, |
| 1165 | init_timeout * HZ); |
| 1166 | |
| 1167 | host_config = &evt_struct->iu.mad.host_config; |
| 1168 | |
| 1169 | /* Set up a lun reset SRP command */ |
| 1170 | memset(host_config, 0x00, sizeof(*host_config)); |
| 1171 | host_config->common.type = VIOSRP_HOST_CONFIG_TYPE; |
| 1172 | host_config->common.length = length; |
| 1173 | host_config->buffer = dma_map_single(hostdata->dev, buffer, length, |
| 1174 | DMA_BIDIRECTIONAL); |
| 1175 | |
| 1176 | if (dma_mapping_error(host_config->buffer)) { |
| 1177 | printk(KERN_ERR |
| 1178 | "ibmvscsi: dma_mapping error " "getting host config\n"); |
| 1179 | free_event_struct(&hostdata->pool, evt_struct); |
| 1180 | return -1; |
| 1181 | } |
| 1182 | |
| 1183 | init_completion(&evt_struct->comp); |
| 1184 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata); |
| 1185 | if (rc == 0) { |
| 1186 | wait_for_completion(&evt_struct->comp); |
| 1187 | dma_unmap_single(hostdata->dev, host_config->buffer, |
| 1188 | length, DMA_BIDIRECTIONAL); |
| 1189 | } |
| 1190 | |
| 1191 | return rc; |
| 1192 | } |
| 1193 | |
| 1194 | /* ------------------------------------------------------------ |
| 1195 | * sysfs attributes |
| 1196 | */ |
| 1197 | static ssize_t show_host_srp_version(struct class_device *class_dev, char *buf) |
| 1198 | { |
| 1199 | struct Scsi_Host *shost = class_to_shost(class_dev); |
| 1200 | struct ibmvscsi_host_data *hostdata = |
| 1201 | (struct ibmvscsi_host_data *)shost->hostdata; |
| 1202 | int len; |
| 1203 | |
| 1204 | len = snprintf(buf, PAGE_SIZE, "%s\n", |
| 1205 | hostdata->madapter_info.srp_version); |
| 1206 | return len; |
| 1207 | } |
| 1208 | |
| 1209 | static struct class_device_attribute ibmvscsi_host_srp_version = { |
| 1210 | .attr = { |
| 1211 | .name = "srp_version", |
| 1212 | .mode = S_IRUGO, |
| 1213 | }, |
| 1214 | .show = show_host_srp_version, |
| 1215 | }; |
| 1216 | |
| 1217 | static ssize_t show_host_partition_name(struct class_device *class_dev, |
| 1218 | char *buf) |
| 1219 | { |
| 1220 | struct Scsi_Host *shost = class_to_shost(class_dev); |
| 1221 | struct ibmvscsi_host_data *hostdata = |
| 1222 | (struct ibmvscsi_host_data *)shost->hostdata; |
| 1223 | int len; |
| 1224 | |
| 1225 | len = snprintf(buf, PAGE_SIZE, "%s\n", |
| 1226 | hostdata->madapter_info.partition_name); |
| 1227 | return len; |
| 1228 | } |
| 1229 | |
| 1230 | static struct class_device_attribute ibmvscsi_host_partition_name = { |
| 1231 | .attr = { |
| 1232 | .name = "partition_name", |
| 1233 | .mode = S_IRUGO, |
| 1234 | }, |
| 1235 | .show = show_host_partition_name, |
| 1236 | }; |
| 1237 | |
| 1238 | static ssize_t show_host_partition_number(struct class_device *class_dev, |
| 1239 | char *buf) |
| 1240 | { |
| 1241 | struct Scsi_Host *shost = class_to_shost(class_dev); |
| 1242 | struct ibmvscsi_host_data *hostdata = |
| 1243 | (struct ibmvscsi_host_data *)shost->hostdata; |
| 1244 | int len; |
| 1245 | |
| 1246 | len = snprintf(buf, PAGE_SIZE, "%d\n", |
| 1247 | hostdata->madapter_info.partition_number); |
| 1248 | return len; |
| 1249 | } |
| 1250 | |
| 1251 | static struct class_device_attribute ibmvscsi_host_partition_number = { |
| 1252 | .attr = { |
| 1253 | .name = "partition_number", |
| 1254 | .mode = S_IRUGO, |
| 1255 | }, |
| 1256 | .show = show_host_partition_number, |
| 1257 | }; |
| 1258 | |
| 1259 | static ssize_t show_host_mad_version(struct class_device *class_dev, char *buf) |
| 1260 | { |
| 1261 | struct Scsi_Host *shost = class_to_shost(class_dev); |
| 1262 | struct ibmvscsi_host_data *hostdata = |
| 1263 | (struct ibmvscsi_host_data *)shost->hostdata; |
| 1264 | int len; |
| 1265 | |
| 1266 | len = snprintf(buf, PAGE_SIZE, "%d\n", |
| 1267 | hostdata->madapter_info.mad_version); |
| 1268 | return len; |
| 1269 | } |
| 1270 | |
| 1271 | static struct class_device_attribute ibmvscsi_host_mad_version = { |
| 1272 | .attr = { |
| 1273 | .name = "mad_version", |
| 1274 | .mode = S_IRUGO, |
| 1275 | }, |
| 1276 | .show = show_host_mad_version, |
| 1277 | }; |
| 1278 | |
| 1279 | static ssize_t show_host_os_type(struct class_device *class_dev, char *buf) |
| 1280 | { |
| 1281 | struct Scsi_Host *shost = class_to_shost(class_dev); |
| 1282 | struct ibmvscsi_host_data *hostdata = |
| 1283 | (struct ibmvscsi_host_data *)shost->hostdata; |
| 1284 | int len; |
| 1285 | |
| 1286 | len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type); |
| 1287 | return len; |
| 1288 | } |
| 1289 | |
| 1290 | static struct class_device_attribute ibmvscsi_host_os_type = { |
| 1291 | .attr = { |
| 1292 | .name = "os_type", |
| 1293 | .mode = S_IRUGO, |
| 1294 | }, |
| 1295 | .show = show_host_os_type, |
| 1296 | }; |
| 1297 | |
| 1298 | static ssize_t show_host_config(struct class_device *class_dev, char *buf) |
| 1299 | { |
| 1300 | struct Scsi_Host *shost = class_to_shost(class_dev); |
| 1301 | struct ibmvscsi_host_data *hostdata = |
| 1302 | (struct ibmvscsi_host_data *)shost->hostdata; |
| 1303 | |
| 1304 | /* returns null-terminated host config data */ |
| 1305 | if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0) |
| 1306 | return strlen(buf); |
| 1307 | else |
| 1308 | return 0; |
| 1309 | } |
| 1310 | |
| 1311 | static struct class_device_attribute ibmvscsi_host_config = { |
| 1312 | .attr = { |
| 1313 | .name = "config", |
| 1314 | .mode = S_IRUGO, |
| 1315 | }, |
| 1316 | .show = show_host_config, |
| 1317 | }; |
| 1318 | |
| 1319 | static struct class_device_attribute *ibmvscsi_attrs[] = { |
| 1320 | &ibmvscsi_host_srp_version, |
| 1321 | &ibmvscsi_host_partition_name, |
| 1322 | &ibmvscsi_host_partition_number, |
| 1323 | &ibmvscsi_host_mad_version, |
| 1324 | &ibmvscsi_host_os_type, |
| 1325 | &ibmvscsi_host_config, |
| 1326 | NULL |
| 1327 | }; |
| 1328 | |
| 1329 | /* ------------------------------------------------------------ |
| 1330 | * SCSI driver registration |
| 1331 | */ |
| 1332 | static struct scsi_host_template driver_template = { |
| 1333 | .module = THIS_MODULE, |
| 1334 | .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, |
| 1335 | .proc_name = "ibmvscsi", |
| 1336 | .queuecommand = ibmvscsi_queuecommand, |
| 1337 | .eh_abort_handler = ibmvscsi_eh_abort_handler, |
| 1338 | .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, |
| 1339 | .cmd_per_lun = 16, |
| 1340 | .can_queue = 1, /* Updated after SRP_LOGIN */ |
| 1341 | .this_id = -1, |
| 1342 | .sg_tablesize = MAX_INDIRECT_BUFS, |
| 1343 | .use_clustering = ENABLE_CLUSTERING, |
| 1344 | .shost_attrs = ibmvscsi_attrs, |
| 1345 | }; |
| 1346 | |
| 1347 | /** |
| 1348 | * Called by bus code for each adapter |
| 1349 | */ |
| 1350 | static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) |
| 1351 | { |
| 1352 | struct ibmvscsi_host_data *hostdata; |
| 1353 | struct Scsi_Host *host; |
| 1354 | struct device *dev = &vdev->dev; |
| 1355 | unsigned long wait_switch = 0; |
| 1356 | |
| 1357 | vdev->dev.driver_data = NULL; |
| 1358 | |
| 1359 | host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); |
| 1360 | if (!host) { |
| 1361 | printk(KERN_ERR "ibmvscsi: couldn't allocate host data\n"); |
| 1362 | goto scsi_host_alloc_failed; |
| 1363 | } |
| 1364 | |
| 1365 | hostdata = (struct ibmvscsi_host_data *)host->hostdata; |
| 1366 | memset(hostdata, 0x00, sizeof(*hostdata)); |
| 1367 | INIT_LIST_HEAD(&hostdata->sent); |
| 1368 | hostdata->host = host; |
| 1369 | hostdata->dev = dev; |
| 1370 | atomic_set(&hostdata->request_limit, -1); |
| 1371 | hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */ |
| 1372 | |
| 1373 | if (ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, |
| 1374 | max_requests) != 0) { |
| 1375 | printk(KERN_ERR "ibmvscsi: couldn't initialize crq\n"); |
| 1376 | goto init_crq_failed; |
| 1377 | } |
| 1378 | if (initialize_event_pool(&hostdata->pool, max_requests, hostdata) != 0) { |
| 1379 | printk(KERN_ERR "ibmvscsi: couldn't initialize event pool\n"); |
| 1380 | goto init_pool_failed; |
| 1381 | } |
| 1382 | |
| 1383 | host->max_lun = 8; |
| 1384 | host->max_id = max_id; |
| 1385 | host->max_channel = max_channel; |
| 1386 | |
| 1387 | if (scsi_add_host(hostdata->host, hostdata->dev)) |
| 1388 | goto add_host_failed; |
| 1389 | |
| 1390 | /* Try to send an initialization message. Note that this is allowed |
| 1391 | * to fail if the other end is not acive. In that case we don't |
| 1392 | * want to scan |
| 1393 | */ |
| 1394 | if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0) { |
| 1395 | /* |
| 1396 | * Wait around max init_timeout secs for the adapter to finish |
| 1397 | * initializing. When we are done initializing, we will have a |
| 1398 | * valid request_limit. We don't want Linux scanning before |
| 1399 | * we are ready. |
| 1400 | */ |
| 1401 | for (wait_switch = jiffies + (init_timeout * HZ); |
| 1402 | time_before(jiffies, wait_switch) && |
| 1403 | atomic_read(&hostdata->request_limit) < 2;) { |
| 1404 | |
| 1405 | msleep(10); |
| 1406 | } |
| 1407 | |
| 1408 | /* if we now have a valid request_limit, initiate a scan */ |
| 1409 | if (atomic_read(&hostdata->request_limit) > 0) |
| 1410 | scsi_scan_host(host); |
| 1411 | } |
| 1412 | |
| 1413 | vdev->dev.driver_data = hostdata; |
| 1414 | return 0; |
| 1415 | |
| 1416 | add_host_failed: |
| 1417 | release_event_pool(&hostdata->pool, hostdata); |
| 1418 | init_pool_failed: |
| 1419 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_requests); |
| 1420 | init_crq_failed: |
| 1421 | scsi_host_put(host); |
| 1422 | scsi_host_alloc_failed: |
| 1423 | return -1; |
| 1424 | } |
| 1425 | |
| 1426 | static int ibmvscsi_remove(struct vio_dev *vdev) |
| 1427 | { |
| 1428 | struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data; |
| 1429 | release_event_pool(&hostdata->pool, hostdata); |
| 1430 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, |
| 1431 | max_requests); |
| 1432 | |
| 1433 | scsi_remove_host(hostdata->host); |
| 1434 | scsi_host_put(hostdata->host); |
| 1435 | |
| 1436 | return 0; |
| 1437 | } |
| 1438 | |
| 1439 | /** |
| 1440 | * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we |
| 1441 | * support. |
| 1442 | */ |
| 1443 | static struct vio_device_id ibmvscsi_device_table[] __devinitdata = { |
| 1444 | {"vscsi", "IBM,v-scsi"}, |
| 1445 | {0,} |
| 1446 | }; |
| 1447 | |
| 1448 | MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
| 1449 | static struct vio_driver ibmvscsi_driver = { |
| 1450 | .name = "ibmvscsi", |
| 1451 | .id_table = ibmvscsi_device_table, |
| 1452 | .probe = ibmvscsi_probe, |
| 1453 | .remove = ibmvscsi_remove |
| 1454 | }; |
| 1455 | |
| 1456 | int __init ibmvscsi_module_init(void) |
| 1457 | { |
| 1458 | return vio_register_driver(&ibmvscsi_driver); |
| 1459 | } |
| 1460 | |
| 1461 | void __exit ibmvscsi_module_exit(void) |
| 1462 | { |
| 1463 | vio_unregister_driver(&ibmvscsi_driver); |
| 1464 | } |
| 1465 | |
| 1466 | module_init(ibmvscsi_module_init); |
| 1467 | module_exit(ibmvscsi_module_exit); |