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; |
Robert Jennings | a897ff2 | 2007-03-28 12:45:46 -0500 | [diff] [blame] | 88 | static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
Dave C Boutcher | 2b541f8 | 2006-01-19 13:34:44 -0600 | [diff] [blame] | 90 | #define IBMVSCSI_VERSION "1.5.8" |
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; |
FUJITA Tomonori | 4c021dd13 | 2006-04-07 19:10:03 +0900 | [diff] [blame] | 124 | pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | if (!pool->events) |
| 126 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
| 128 | pool->iu_storage = |
| 129 | dma_alloc_coherent(hostdata->dev, |
| 130 | pool->size * sizeof(*pool->iu_storage), |
| 131 | &pool->iu_token, 0); |
| 132 | if (!pool->iu_storage) { |
| 133 | kfree(pool->events); |
| 134 | return -ENOMEM; |
| 135 | } |
| 136 | |
| 137 | for (i = 0; i < pool->size; ++i) { |
| 138 | struct srp_event_struct *evt = &pool->events[i]; |
| 139 | memset(&evt->crq, 0x00, sizeof(evt->crq)); |
| 140 | atomic_set(&evt->free, 1); |
| 141 | evt->crq.valid = 0x80; |
| 142 | evt->crq.IU_length = sizeof(*evt->xfer_iu); |
| 143 | evt->crq.IU_data_ptr = pool->iu_token + |
| 144 | sizeof(*evt->xfer_iu) * i; |
| 145 | evt->xfer_iu = pool->iu_storage + i; |
| 146 | evt->hostdata = hostdata; |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 147 | evt->ext_list = NULL; |
| 148 | evt->ext_list_token = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | } |
| 150 | |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * release_event_pool: - Frees memory of an event pool of a host |
| 156 | * @pool: event_pool to be released |
| 157 | * @hostdata: ibmvscsi_host_data who owns the even pool |
| 158 | * |
| 159 | * Returns zero on success. |
| 160 | */ |
| 161 | static void release_event_pool(struct event_pool *pool, |
| 162 | struct ibmvscsi_host_data *hostdata) |
| 163 | { |
| 164 | int i, in_use = 0; |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 165 | for (i = 0; i < pool->size; ++i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | if (atomic_read(&pool->events[i].free) != 1) |
| 167 | ++in_use; |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 168 | if (pool->events[i].ext_list) { |
| 169 | dma_free_coherent(hostdata->dev, |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 170 | SG_ALL * sizeof(struct srp_direct_buf), |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 171 | pool->events[i].ext_list, |
| 172 | pool->events[i].ext_list_token); |
| 173 | } |
| 174 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | if (in_use) |
| 176 | printk(KERN_WARNING |
| 177 | "ibmvscsi: releasing event pool with %d " |
| 178 | "events still in use?\n", in_use); |
| 179 | kfree(pool->events); |
| 180 | dma_free_coherent(hostdata->dev, |
| 181 | pool->size * sizeof(*pool->iu_storage), |
| 182 | pool->iu_storage, pool->iu_token); |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * valid_event_struct: - Determines if event is valid. |
| 187 | * @pool: event_pool that contains the event |
| 188 | * @evt: srp_event_struct to be checked for validity |
| 189 | * |
| 190 | * Returns zero if event is invalid, one otherwise. |
| 191 | */ |
| 192 | static int valid_event_struct(struct event_pool *pool, |
| 193 | struct srp_event_struct *evt) |
| 194 | { |
| 195 | int index = evt - pool->events; |
| 196 | if (index < 0 || index >= pool->size) /* outside of bounds */ |
| 197 | return 0; |
| 198 | if (evt != pool->events + index) /* unaligned */ |
| 199 | return 0; |
| 200 | return 1; |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * ibmvscsi_free-event_struct: - Changes status of event to "free" |
| 205 | * @pool: event_pool that contains the event |
| 206 | * @evt: srp_event_struct to be modified |
| 207 | * |
| 208 | */ |
| 209 | static void free_event_struct(struct event_pool *pool, |
| 210 | struct srp_event_struct *evt) |
| 211 | { |
| 212 | if (!valid_event_struct(pool, evt)) { |
| 213 | printk(KERN_ERR |
| 214 | "ibmvscsi: Freeing invalid event_struct %p " |
| 215 | "(not in pool %p)\n", evt, pool->events); |
| 216 | return; |
| 217 | } |
| 218 | if (atomic_inc_return(&evt->free) != 1) { |
| 219 | printk(KERN_ERR |
| 220 | "ibmvscsi: Freeing event_struct %p " |
| 221 | "which is not in use!\n", evt); |
| 222 | return; |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * get_evt_struct: - Gets the next free event in pool |
| 228 | * @pool: event_pool that contains the events to be searched |
| 229 | * |
| 230 | * Returns the next event in "free" state, and NULL if none are free. |
| 231 | * Note that no synchronization is done here, we assume the host_lock |
| 232 | * will syncrhonze things. |
| 233 | */ |
| 234 | static struct srp_event_struct *get_event_struct(struct event_pool *pool) |
| 235 | { |
| 236 | int i; |
| 237 | int poolsize = pool->size; |
| 238 | int offset = pool->next; |
| 239 | |
| 240 | for (i = 0; i < poolsize; i++) { |
| 241 | offset = (offset + 1) % poolsize; |
| 242 | if (!atomic_dec_if_positive(&pool->events[offset].free)) { |
| 243 | pool->next = offset; |
| 244 | return &pool->events[offset]; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); |
| 249 | return NULL; |
| 250 | } |
| 251 | |
| 252 | /** |
| 253 | * init_event_struct: Initialize fields in an event struct that are always |
| 254 | * required. |
| 255 | * @evt: The event |
| 256 | * @done: Routine to call when the event is responded to |
| 257 | * @format: SRP or MAD format |
| 258 | * @timeout: timeout value set in the CRQ |
| 259 | */ |
| 260 | static void init_event_struct(struct srp_event_struct *evt_struct, |
| 261 | void (*done) (struct srp_event_struct *), |
| 262 | u8 format, |
| 263 | int timeout) |
| 264 | { |
| 265 | evt_struct->cmnd = NULL; |
| 266 | evt_struct->cmnd_done = NULL; |
| 267 | evt_struct->sync_srp = NULL; |
| 268 | evt_struct->crq.format = format; |
| 269 | evt_struct->crq.timeout = timeout; |
| 270 | evt_struct->done = done; |
| 271 | } |
| 272 | |
| 273 | /* ------------------------------------------------------------ |
| 274 | * Routines for receiving SCSI responses from the hosting partition |
| 275 | */ |
| 276 | |
| 277 | /** |
| 278 | * set_srp_direction: Set the fields in the srp related to data |
| 279 | * direction and number of buffers based on the direction in |
| 280 | * the scsi_cmnd and the number of buffers |
| 281 | */ |
| 282 | static void set_srp_direction(struct scsi_cmnd *cmd, |
| 283 | struct srp_cmd *srp_cmd, |
| 284 | int numbuf) |
| 285 | { |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 286 | u8 fmt; |
| 287 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | if (numbuf == 0) |
| 289 | return; |
| 290 | |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 291 | if (numbuf == 1) |
| 292 | fmt = SRP_DATA_DESC_DIRECT; |
| 293 | else { |
| 294 | fmt = SRP_DATA_DESC_INDIRECT; |
| 295 | numbuf = min(numbuf, MAX_INDIRECT_BUFS); |
| 296 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 298 | srp_cmd->data_out_desc_cnt = numbuf; |
| 299 | else |
| 300 | srp_cmd->data_in_desc_cnt = numbuf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | } |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 302 | |
| 303 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
| 304 | srp_cmd->buf_fmt = fmt << 4; |
| 305 | else |
| 306 | srp_cmd->buf_fmt = fmt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | } |
| 308 | |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 309 | static void unmap_sg_list(int num_entries, |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 310 | struct device *dev, |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 311 | struct srp_direct_buf *md) |
| 312 | { |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 313 | int i; |
| 314 | |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 315 | for (i = 0; i < num_entries; ++i) |
| 316 | dma_unmap_single(dev, md[i].va, md[i].len, DMA_BIDIRECTIONAL); |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 317 | } |
| 318 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | /** |
| 320 | * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format |
| 321 | * @cmd: srp_cmd whose additional_data member will be unmapped |
| 322 | * @dev: device for which the memory is mapped |
| 323 | * |
| 324 | */ |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 325 | static void unmap_cmd_data(struct srp_cmd *cmd, |
| 326 | struct srp_event_struct *evt_struct, |
| 327 | struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | { |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 329 | u8 out_fmt, in_fmt; |
| 330 | |
| 331 | out_fmt = cmd->buf_fmt >> 4; |
| 332 | in_fmt = cmd->buf_fmt & ((1U << 4) - 1); |
| 333 | |
| 334 | if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | return; |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 336 | else if (out_fmt == SRP_DATA_DESC_DIRECT || |
| 337 | in_fmt == SRP_DATA_DESC_DIRECT) { |
| 338 | struct srp_direct_buf *data = |
| 339 | (struct srp_direct_buf *) cmd->add_data; |
| 340 | dma_unmap_single(dev, data->va, data->len, DMA_BIDIRECTIONAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | } else { |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 342 | struct srp_indirect_buf *indirect = |
| 343 | (struct srp_indirect_buf *) cmd->add_data; |
| 344 | int num_mapped = indirect->table_desc.len / |
| 345 | sizeof(struct srp_direct_buf); |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 346 | |
| 347 | if (num_mapped <= MAX_INDIRECT_BUFS) { |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 348 | unmap_sg_list(num_mapped, dev, &indirect->desc_list[0]); |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 349 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | } |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 351 | |
| 352 | unmap_sg_list(num_mapped, dev, evt_struct->ext_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | } |
| 354 | } |
| 355 | |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 356 | static int map_sg_list(int num_entries, |
| 357 | struct scatterlist *sg, |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 358 | struct srp_direct_buf *md) |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 359 | { |
| 360 | int i; |
| 361 | u64 total_length = 0; |
| 362 | |
| 363 | for (i = 0; i < num_entries; ++i) { |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 364 | struct srp_direct_buf *descr = md + i; |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 365 | struct scatterlist *sg_entry = &sg[i]; |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 366 | descr->va = sg_dma_address(sg_entry); |
| 367 | descr->len = sg_dma_len(sg_entry); |
| 368 | descr->key = 0; |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 369 | total_length += sg_dma_len(sg_entry); |
| 370 | } |
| 371 | return total_length; |
| 372 | } |
| 373 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | /** |
| 375 | * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields |
| 376 | * @cmd: Scsi_Cmnd with the scatterlist |
| 377 | * @srp_cmd: srp_cmd that contains the memory descriptor |
| 378 | * @dev: device for which to map dma memory |
| 379 | * |
| 380 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. |
| 381 | * Returns 1 on success. |
| 382 | */ |
| 383 | static int map_sg_data(struct scsi_cmnd *cmd, |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 384 | struct srp_event_struct *evt_struct, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | struct srp_cmd *srp_cmd, struct device *dev) |
| 386 | { |
| 387 | |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 388 | int sg_mapped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | u64 total_length = 0; |
| 390 | struct scatterlist *sg = cmd->request_buffer; |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 391 | struct srp_direct_buf *data = |
| 392 | (struct srp_direct_buf *) srp_cmd->add_data; |
| 393 | struct srp_indirect_buf *indirect = |
| 394 | (struct srp_indirect_buf *) data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
| 396 | sg_mapped = dma_map_sg(dev, sg, cmd->use_sg, DMA_BIDIRECTIONAL); |
| 397 | |
| 398 | if (sg_mapped == 0) |
| 399 | return 0; |
| 400 | |
| 401 | set_srp_direction(cmd, srp_cmd, sg_mapped); |
| 402 | |
| 403 | /* special case; we can use a single direct descriptor */ |
| 404 | if (sg_mapped == 1) { |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 405 | data->va = sg_dma_address(&sg[0]); |
| 406 | data->len = sg_dma_len(&sg[0]); |
| 407 | data->key = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | return 1; |
| 409 | } |
| 410 | |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 411 | indirect->table_desc.va = 0; |
| 412 | indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf); |
| 413 | indirect->table_desc.key = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 415 | if (sg_mapped <= MAX_INDIRECT_BUFS) { |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 416 | total_length = map_sg_list(sg_mapped, sg, |
| 417 | &indirect->desc_list[0]); |
| 418 | indirect->len = total_length; |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 419 | return 1; |
| 420 | } |
| 421 | |
| 422 | /* get indirect table */ |
| 423 | if (!evt_struct->ext_list) { |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 424 | evt_struct->ext_list = (struct srp_direct_buf *) |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 425 | dma_alloc_coherent(dev, |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 426 | SG_ALL * sizeof(struct srp_direct_buf), |
| 427 | &evt_struct->ext_list_token, 0); |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 428 | if (!evt_struct->ext_list) { |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 429 | printk(KERN_ERR |
| 430 | "ibmvscsi: Can't allocate memory for indirect table\n"); |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 431 | return 0; |
| 432 | |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | total_length = map_sg_list(sg_mapped, sg, evt_struct->ext_list); |
| 437 | |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 438 | indirect->len = total_length; |
| 439 | indirect->table_desc.va = evt_struct->ext_list_token; |
| 440 | indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]); |
| 441 | memcpy(indirect->desc_list, evt_struct->ext_list, |
| 442 | MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 443 | |
| 444 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | } |
| 446 | |
| 447 | /** |
| 448 | * map_single_data: - Maps memory and initializes memory decriptor fields |
| 449 | * @cmd: struct scsi_cmnd with the memory to be mapped |
| 450 | * @srp_cmd: srp_cmd that contains the memory descriptor |
| 451 | * @dev: device for which to map dma memory |
| 452 | * |
| 453 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. |
| 454 | * Returns 1 on success. |
| 455 | */ |
| 456 | static int map_single_data(struct scsi_cmnd *cmd, |
| 457 | struct srp_cmd *srp_cmd, struct device *dev) |
| 458 | { |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 459 | struct srp_direct_buf *data = |
| 460 | (struct srp_direct_buf *) srp_cmd->add_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 462 | data->va = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | dma_map_single(dev, cmd->request_buffer, |
| 464 | cmd->request_bufflen, |
| 465 | DMA_BIDIRECTIONAL); |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 466 | if (dma_mapping_error(data->va)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | printk(KERN_ERR |
| 468 | "ibmvscsi: Unable to map request_buffer for command!\n"); |
| 469 | return 0; |
| 470 | } |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 471 | data->len = cmd->request_bufflen; |
| 472 | data->key = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
| 474 | set_srp_direction(cmd, srp_cmd, 1); |
| 475 | |
| 476 | return 1; |
| 477 | } |
| 478 | |
| 479 | /** |
| 480 | * map_data_for_srp_cmd: - Calls functions to map data for srp cmds |
| 481 | * @cmd: struct scsi_cmnd with the memory to be mapped |
| 482 | * @srp_cmd: srp_cmd that contains the memory descriptor |
| 483 | * @dev: dma device for which to map dma memory |
| 484 | * |
| 485 | * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds |
| 486 | * Returns 1 on success. |
| 487 | */ |
| 488 | static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 489 | struct srp_event_struct *evt_struct, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | struct srp_cmd *srp_cmd, struct device *dev) |
| 491 | { |
| 492 | switch (cmd->sc_data_direction) { |
| 493 | case DMA_FROM_DEVICE: |
| 494 | case DMA_TO_DEVICE: |
| 495 | break; |
| 496 | case DMA_NONE: |
| 497 | return 1; |
| 498 | case DMA_BIDIRECTIONAL: |
| 499 | printk(KERN_ERR |
| 500 | "ibmvscsi: Can't map DMA_BIDIRECTIONAL to read/write\n"); |
| 501 | return 0; |
| 502 | default: |
| 503 | printk(KERN_ERR |
| 504 | "ibmvscsi: Unknown data direction 0x%02x; can't map!\n", |
| 505 | cmd->sc_data_direction); |
| 506 | return 0; |
| 507 | } |
| 508 | |
| 509 | if (!cmd->request_buffer) |
| 510 | return 1; |
| 511 | if (cmd->use_sg) |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 512 | return map_sg_data(cmd, evt_struct, srp_cmd, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | return map_single_data(cmd, srp_cmd, dev); |
| 514 | } |
| 515 | |
| 516 | /* ------------------------------------------------------------ |
| 517 | * Routines for sending and receiving SRPs |
| 518 | */ |
| 519 | /** |
| 520 | * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() |
| 521 | * @evt_struct: evt_struct to be sent |
| 522 | * @hostdata: ibmvscsi_host_data of host |
| 523 | * |
| 524 | * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) |
| 525 | * Note that this routine assumes that host_lock is held for synchronization |
| 526 | */ |
| 527 | static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, |
| 528 | struct ibmvscsi_host_data *hostdata) |
| 529 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | u64 *crq_as_u64 = (u64 *) &evt_struct->crq; |
Dave C Boutcher | cefbda2 | 2006-06-12 21:22:51 -0500 | [diff] [blame] | 531 | int request_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | int rc; |
| 533 | |
Robert Jennings | a897ff2 | 2007-03-28 12:45:46 -0500 | [diff] [blame] | 534 | /* If we have exhausted our request limit, just fail this request, |
| 535 | * unless it is for a reset or abort. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | * Note that there are rare cases involving driver generated requests |
| 537 | * (such as task management requests) that the mid layer may think we |
| 538 | * can handle more requests (can_queue) when we actually can't |
| 539 | */ |
Dave C Boutcher | cefbda2 | 2006-06-12 21:22:51 -0500 | [diff] [blame] | 540 | if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) { |
| 541 | request_status = |
| 542 | atomic_dec_if_positive(&hostdata->request_limit); |
| 543 | /* If request limit was -1 when we started, it is now even |
| 544 | * less than that |
| 545 | */ |
| 546 | if (request_status < -1) |
| 547 | goto send_error; |
Robert Jennings | a897ff2 | 2007-03-28 12:45:46 -0500 | [diff] [blame] | 548 | /* Otherwise, we may have run out of requests. */ |
| 549 | /* Abort and reset calls should make it through. |
| 550 | * Nothing except abort and reset should use the last two |
| 551 | * slots unless we had two or less to begin with. |
| 552 | */ |
| 553 | else if (request_status < 2 && |
| 554 | evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) { |
| 555 | /* In the case that we have less than two requests |
| 556 | * available, check the server limit as a combination |
| 557 | * of the request limit and the number of requests |
| 558 | * in-flight (the size of the send list). If the |
| 559 | * server limit is greater than 2, return busy so |
| 560 | * that the last two are reserved for reset and abort. |
| 561 | */ |
| 562 | int server_limit = request_status; |
| 563 | struct srp_event_struct *tmp_evt; |
| 564 | |
| 565 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { |
| 566 | server_limit++; |
| 567 | } |
| 568 | |
| 569 | if (server_limit > 2) |
| 570 | goto send_busy; |
| 571 | } |
Dave C Boutcher | cefbda2 | 2006-06-12 21:22:51 -0500 | [diff] [blame] | 572 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | |
| 574 | /* Copy the IU into the transfer area */ |
| 575 | *evt_struct->xfer_iu = evt_struct->iu; |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 576 | evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | |
| 578 | /* Add this to the sent list. We need to do this |
| 579 | * before we actually send |
| 580 | * in case it comes back REALLY fast |
| 581 | */ |
| 582 | list_add_tail(&evt_struct->list, &hostdata->sent); |
| 583 | |
| 584 | if ((rc = |
| 585 | ibmvscsi_send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) { |
| 586 | list_del(&evt_struct->list); |
| 587 | |
Dave C Boutcher | 2b541f8 | 2006-01-19 13:34:44 -0600 | [diff] [blame] | 588 | printk(KERN_ERR "ibmvscsi: send error %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | rc); |
Robert Jennings | a897ff2 | 2007-03-28 12:45:46 -0500 | [diff] [blame] | 590 | atomic_inc(&hostdata->request_limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | goto send_error; |
| 592 | } |
| 593 | |
| 594 | return 0; |
| 595 | |
Dave C Boutcher | cefbda2 | 2006-06-12 21:22:51 -0500 | [diff] [blame] | 596 | send_busy: |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 597 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | free_event_struct(&hostdata->pool, evt_struct); |
Robert Jennings | a897ff2 | 2007-03-28 12:45:46 -0500 | [diff] [blame] | 600 | atomic_inc(&hostdata->request_limit); |
| 601 | return SCSI_MLQUEUE_HOST_BUSY; |
Dave C Boutcher | cefbda2 | 2006-06-12 21:22:51 -0500 | [diff] [blame] | 602 | |
| 603 | send_error: |
| 604 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
| 605 | |
| 606 | if (evt_struct->cmnd != NULL) { |
| 607 | evt_struct->cmnd->result = DID_ERROR << 16; |
| 608 | evt_struct->cmnd_done(evt_struct->cmnd); |
| 609 | } else if (evt_struct->done) |
| 610 | evt_struct->done(evt_struct); |
| 611 | |
| 612 | free_event_struct(&hostdata->pool, evt_struct); |
| 613 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | } |
| 615 | |
| 616 | /** |
| 617 | * handle_cmd_rsp: - Handle responses from commands |
| 618 | * @evt_struct: srp_event_struct to be handled |
| 619 | * |
| 620 | * Used as a callback by when sending scsi cmds. |
| 621 | * Gets called by ibmvscsi_handle_crq() |
| 622 | */ |
| 623 | static void handle_cmd_rsp(struct srp_event_struct *evt_struct) |
| 624 | { |
| 625 | struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; |
| 626 | struct scsi_cmnd *cmnd = evt_struct->cmnd; |
| 627 | |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 628 | if (unlikely(rsp->opcode != SRP_RSP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | if (printk_ratelimit()) |
| 630 | printk(KERN_WARNING |
| 631 | "ibmvscsi: bad SRP RSP type %d\n", |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 632 | rsp->opcode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | } |
| 634 | |
| 635 | if (cmnd) { |
| 636 | cmnd->result = rsp->status; |
| 637 | if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) |
| 638 | memcpy(cmnd->sense_buffer, |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 639 | rsp->data, |
| 640 | rsp->sense_data_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 642 | evt_struct, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | evt_struct->hostdata->dev); |
| 644 | |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 645 | if (rsp->flags & SRP_RSP_FLAG_DOOVER) |
| 646 | cmnd->resid = rsp->data_out_res_cnt; |
| 647 | else if (rsp->flags & SRP_RSP_FLAG_DIOVER) |
| 648 | cmnd->resid = rsp->data_in_res_cnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | } |
| 650 | |
| 651 | if (evt_struct->cmnd_done) |
| 652 | evt_struct->cmnd_done(cmnd); |
| 653 | } |
| 654 | |
| 655 | /** |
| 656 | * lun_from_dev: - Returns the lun of the scsi device |
| 657 | * @dev: struct scsi_device |
| 658 | * |
| 659 | */ |
| 660 | static inline u16 lun_from_dev(struct scsi_device *dev) |
| 661 | { |
| 662 | return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; |
| 663 | } |
| 664 | |
| 665 | /** |
| 666 | * ibmvscsi_queue: - The queuecommand function of the scsi template |
| 667 | * @cmd: struct scsi_cmnd to be executed |
| 668 | * @done: Callback function to be called when cmd is completed |
| 669 | */ |
| 670 | static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd, |
| 671 | void (*done) (struct scsi_cmnd *)) |
| 672 | { |
| 673 | struct srp_cmd *srp_cmd; |
| 674 | struct srp_event_struct *evt_struct; |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 675 | struct srp_indirect_buf *indirect; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | struct ibmvscsi_host_data *hostdata = |
| 677 | (struct ibmvscsi_host_data *)&cmnd->device->host->hostdata; |
| 678 | u16 lun = lun_from_dev(cmnd->device); |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 679 | u8 out_fmt, in_fmt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | |
| 681 | evt_struct = get_event_struct(&hostdata->pool); |
| 682 | if (!evt_struct) |
| 683 | return SCSI_MLQUEUE_HOST_BUSY; |
| 684 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | /* Set up the actual SRP IU */ |
| 686 | srp_cmd = &evt_struct->iu.srp.cmd; |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 687 | memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); |
| 688 | srp_cmd->opcode = SRP_CMD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(cmnd->cmnd)); |
| 690 | srp_cmd->lun = ((u64) lun) << 48; |
| 691 | |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 692 | if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | printk(KERN_ERR "ibmvscsi: couldn't convert cmd to srp_cmd\n"); |
| 694 | free_event_struct(&hostdata->pool, evt_struct); |
| 695 | return SCSI_MLQUEUE_HOST_BUSY; |
| 696 | } |
| 697 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | init_event_struct(evt_struct, |
| 699 | handle_cmd_rsp, |
| 700 | VIOSRP_SRP_FORMAT, |
Dave C Boutcher | 8224bfa | 2005-08-22 14:38:26 -0500 | [diff] [blame] | 701 | cmnd->timeout_per_command/HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | |
| 703 | evt_struct->cmnd = cmnd; |
| 704 | evt_struct->cmnd_done = done; |
| 705 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | /* Fix up dma address of the buffer itself */ |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 707 | indirect = (struct srp_indirect_buf *) srp_cmd->add_data; |
| 708 | out_fmt = srp_cmd->buf_fmt >> 4; |
| 709 | in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); |
| 710 | if ((in_fmt == SRP_DATA_DESC_INDIRECT || |
| 711 | out_fmt == SRP_DATA_DESC_INDIRECT) && |
| 712 | indirect->table_desc.va == 0) { |
| 713 | indirect->table_desc.va = evt_struct->crq.IU_data_ptr + |
| 714 | offsetof(struct srp_cmd, add_data) + |
| 715 | offsetof(struct srp_indirect_buf, desc_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | } |
| 717 | |
| 718 | return ibmvscsi_send_srp_event(evt_struct, hostdata); |
| 719 | } |
| 720 | |
| 721 | /* ------------------------------------------------------------ |
| 722 | * Routines for driver initialization |
| 723 | */ |
| 724 | /** |
| 725 | * adapter_info_rsp: - Handle response to MAD adapter info request |
| 726 | * @evt_struct: srp_event_struct with the response |
| 727 | * |
| 728 | * Used as a "done" callback by when sending adapter_info. Gets called |
| 729 | * by ibmvscsi_handle_crq() |
| 730 | */ |
| 731 | static void adapter_info_rsp(struct srp_event_struct *evt_struct) |
| 732 | { |
| 733 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; |
| 734 | dma_unmap_single(hostdata->dev, |
| 735 | evt_struct->iu.mad.adapter_info.buffer, |
| 736 | evt_struct->iu.mad.adapter_info.common.length, |
| 737 | DMA_BIDIRECTIONAL); |
| 738 | |
| 739 | if (evt_struct->xfer_iu->mad.adapter_info.common.status) { |
| 740 | printk("ibmvscsi: error %d getting adapter info\n", |
| 741 | evt_struct->xfer_iu->mad.adapter_info.common.status); |
| 742 | } else { |
| 743 | printk("ibmvscsi: host srp version: %s, " |
| 744 | "host partition %s (%d), OS %d, max io %u\n", |
| 745 | hostdata->madapter_info.srp_version, |
| 746 | hostdata->madapter_info.partition_name, |
| 747 | hostdata->madapter_info.partition_number, |
| 748 | hostdata->madapter_info.os_type, |
| 749 | hostdata->madapter_info.port_max_txu[0]); |
| 750 | |
| 751 | if (hostdata->madapter_info.port_max_txu[0]) |
| 752 | hostdata->host->max_sectors = |
| 753 | hostdata->madapter_info.port_max_txu[0] >> 9; |
Dave C Boutcher | 154fb61 | 2005-09-13 10:09:02 -0500 | [diff] [blame] | 754 | |
| 755 | if (hostdata->madapter_info.os_type == 3 && |
| 756 | strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { |
| 757 | printk("ibmvscsi: host (Ver. %s) doesn't support large" |
| 758 | "transfers\n", |
| 759 | hostdata->madapter_info.srp_version); |
| 760 | printk("ibmvscsi: limiting scatterlists to %d\n", |
| 761 | MAX_INDIRECT_BUFS); |
| 762 | hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; |
| 763 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | } |
| 765 | } |
| 766 | |
| 767 | /** |
| 768 | * send_mad_adapter_info: - Sends the mad adapter info request |
| 769 | * and stores the result so it can be retrieved with |
| 770 | * sysfs. We COULD consider causing a failure if the |
| 771 | * returned SRP version doesn't match ours. |
| 772 | * @hostdata: ibmvscsi_host_data of host |
| 773 | * |
| 774 | * Returns zero if successful. |
| 775 | */ |
| 776 | static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) |
| 777 | { |
| 778 | struct viosrp_adapter_info *req; |
| 779 | struct srp_event_struct *evt_struct; |
FUJITA Tomonori | e5dbfa6 | 2006-04-14 13:52:18 +0900 | [diff] [blame] | 780 | dma_addr_t addr; |
| 781 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | evt_struct = get_event_struct(&hostdata->pool); |
| 783 | if (!evt_struct) { |
| 784 | printk(KERN_ERR "ibmvscsi: couldn't allocate an event " |
| 785 | "for ADAPTER_INFO_REQ!\n"); |
| 786 | return; |
| 787 | } |
| 788 | |
| 789 | init_event_struct(evt_struct, |
| 790 | adapter_info_rsp, |
| 791 | VIOSRP_MAD_FORMAT, |
| 792 | init_timeout * HZ); |
| 793 | |
| 794 | req = &evt_struct->iu.mad.adapter_info; |
| 795 | memset(req, 0x00, sizeof(*req)); |
| 796 | |
| 797 | req->common.type = VIOSRP_ADAPTER_INFO_TYPE; |
| 798 | req->common.length = sizeof(hostdata->madapter_info); |
FUJITA Tomonori | e5dbfa6 | 2006-04-14 13:52:18 +0900 | [diff] [blame] | 799 | req->buffer = addr = dma_map_single(hostdata->dev, |
| 800 | &hostdata->madapter_info, |
| 801 | sizeof(hostdata->madapter_info), |
| 802 | DMA_BIDIRECTIONAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | |
| 804 | if (dma_mapping_error(req->buffer)) { |
| 805 | printk(KERN_ERR |
| 806 | "ibmvscsi: Unable to map request_buffer " |
| 807 | "for adapter_info!\n"); |
| 808 | free_event_struct(&hostdata->pool, evt_struct); |
| 809 | return; |
| 810 | } |
| 811 | |
FUJITA Tomonori | e5dbfa6 | 2006-04-14 13:52:18 +0900 | [diff] [blame] | 812 | if (ibmvscsi_send_srp_event(evt_struct, hostdata)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | printk(KERN_ERR "ibmvscsi: couldn't send ADAPTER_INFO_REQ!\n"); |
FUJITA Tomonori | e5dbfa6 | 2006-04-14 13:52:18 +0900 | [diff] [blame] | 814 | dma_unmap_single(hostdata->dev, |
| 815 | addr, |
| 816 | sizeof(hostdata->madapter_info), |
| 817 | DMA_BIDIRECTIONAL); |
| 818 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | }; |
| 820 | |
| 821 | /** |
| 822 | * login_rsp: - Handle response to SRP login request |
| 823 | * @evt_struct: srp_event_struct with the response |
| 824 | * |
| 825 | * Used as a "done" callback by when sending srp_login. Gets called |
| 826 | * by ibmvscsi_handle_crq() |
| 827 | */ |
| 828 | static void login_rsp(struct srp_event_struct *evt_struct) |
| 829 | { |
| 830 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 831 | switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { |
| 832 | case SRP_LOGIN_RSP: /* it worked! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | break; |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 834 | case SRP_LOGIN_REJ: /* refused! */ |
Dave C Boutcher | 2b541f8 | 2006-01-19 13:34:44 -0600 | [diff] [blame] | 835 | printk(KERN_INFO "ibmvscsi: SRP_LOGIN_REJ reason %u\n", |
| 836 | evt_struct->xfer_iu->srp.login_rej.reason); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | /* Login failed. */ |
| 838 | atomic_set(&hostdata->request_limit, -1); |
| 839 | return; |
| 840 | default: |
| 841 | printk(KERN_ERR |
| 842 | "ibmvscsi: Invalid login response typecode 0x%02x!\n", |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 843 | evt_struct->xfer_iu->srp.login_rsp.opcode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | /* Login failed. */ |
| 845 | atomic_set(&hostdata->request_limit, -1); |
| 846 | return; |
| 847 | } |
| 848 | |
| 849 | printk(KERN_INFO "ibmvscsi: SRP_LOGIN succeeded\n"); |
| 850 | |
Robert Jennings | a897ff2 | 2007-03-28 12:45:46 -0500 | [diff] [blame] | 851 | if (evt_struct->xfer_iu->srp.login_rsp.req_lim_delta < 0) |
| 852 | printk(KERN_ERR "ibmvscsi: Invalid request_limit.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | |
Robert Jennings | a897ff2 | 2007-03-28 12:45:46 -0500 | [diff] [blame] | 854 | /* Now we know what the real request-limit is. |
| 855 | * This value is set rather than added to request_limit because |
| 856 | * request_limit could have been set to -1 by this client. |
| 857 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | atomic_set(&hostdata->request_limit, |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 859 | evt_struct->xfer_iu->srp.login_rsp.req_lim_delta); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
Dave C Boutcher | 2b541f8 | 2006-01-19 13:34:44 -0600 | [diff] [blame] | 861 | /* If we had any pending I/Os, kick them */ |
| 862 | scsi_unblock_requests(hostdata->host); |
| 863 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | send_mad_adapter_info(hostdata); |
| 865 | return; |
| 866 | } |
| 867 | |
| 868 | /** |
| 869 | * send_srp_login: - Sends the srp login |
| 870 | * @hostdata: ibmvscsi_host_data of host |
| 871 | * |
| 872 | * Returns zero if successful. |
| 873 | */ |
| 874 | static int send_srp_login(struct ibmvscsi_host_data *hostdata) |
| 875 | { |
| 876 | int rc; |
| 877 | unsigned long flags; |
| 878 | struct srp_login_req *login; |
| 879 | struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); |
| 880 | if (!evt_struct) { |
| 881 | printk(KERN_ERR |
| 882 | "ibmvscsi: couldn't allocate an event for login req!\n"); |
| 883 | return FAILED; |
| 884 | } |
| 885 | |
| 886 | init_event_struct(evt_struct, |
| 887 | login_rsp, |
| 888 | VIOSRP_SRP_FORMAT, |
| 889 | init_timeout * HZ); |
| 890 | |
| 891 | login = &evt_struct->iu.srp.login_req; |
Dave C Boutcher | 2b541f8 | 2006-01-19 13:34:44 -0600 | [diff] [blame] | 892 | memset(login, 0x00, sizeof(struct srp_login_req)); |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 893 | login->opcode = SRP_LOGIN_REQ; |
| 894 | login->req_it_iu_len = sizeof(union srp_iu); |
| 895 | login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | |
Dave C Boutcher | 9b833e4 | 2006-03-23 13:47:07 -0600 | [diff] [blame] | 897 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | /* Start out with a request limit of 1, since this is negotiated in |
| 899 | * the login request we are just sending |
| 900 | */ |
| 901 | atomic_set(&hostdata->request_limit, 1); |
| 902 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata); |
| 904 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
Dave C Boutcher | 9b833e4 | 2006-03-23 13:47:07 -0600 | [diff] [blame] | 905 | printk("ibmvscsic: sent SRP login\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | return rc; |
| 907 | }; |
| 908 | |
| 909 | /** |
| 910 | * sync_completion: Signal that a synchronous command has completed |
| 911 | * Note that after returning from this call, the evt_struct is freed. |
| 912 | * the caller waiting on this completion shouldn't touch the evt_struct |
| 913 | * again. |
| 914 | */ |
| 915 | static void sync_completion(struct srp_event_struct *evt_struct) |
| 916 | { |
| 917 | /* copy the response back */ |
| 918 | if (evt_struct->sync_srp) |
| 919 | *evt_struct->sync_srp = *evt_struct->xfer_iu; |
| 920 | |
| 921 | complete(&evt_struct->comp); |
| 922 | } |
| 923 | |
| 924 | /** |
| 925 | * ibmvscsi_abort: Abort a command...from scsi host template |
| 926 | * send this over to the server and wait synchronously for the response |
| 927 | */ |
| 928 | static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) |
| 929 | { |
| 930 | struct ibmvscsi_host_data *hostdata = |
| 931 | (struct ibmvscsi_host_data *)cmd->device->host->hostdata; |
| 932 | struct srp_tsk_mgmt *tsk_mgmt; |
| 933 | struct srp_event_struct *evt; |
| 934 | struct srp_event_struct *tmp_evt, *found_evt; |
| 935 | union viosrp_iu srp_rsp; |
| 936 | int rsp_rc; |
Dave C Boutcher | be042f2 | 2005-08-15 16:52:58 -0500 | [diff] [blame] | 937 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | u16 lun = lun_from_dev(cmd->device); |
| 939 | |
| 940 | /* First, find this command in our sent list so we can figure |
| 941 | * out the correct tag |
| 942 | */ |
Dave C Boutcher | be042f2 | 2005-08-15 16:52:58 -0500 | [diff] [blame] | 943 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | found_evt = NULL; |
| 945 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { |
| 946 | if (tmp_evt->cmnd == cmd) { |
| 947 | found_evt = tmp_evt; |
| 948 | break; |
| 949 | } |
| 950 | } |
| 951 | |
Dave C Boutcher | be042f2 | 2005-08-15 16:52:58 -0500 | [diff] [blame] | 952 | if (!found_evt) { |
| 953 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | return FAILED; |
Dave C Boutcher | be042f2 | 2005-08-15 16:52:58 -0500 | [diff] [blame] | 955 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | |
| 957 | evt = get_event_struct(&hostdata->pool); |
| 958 | if (evt == NULL) { |
Dave C Boutcher | be042f2 | 2005-08-15 16:52:58 -0500 | [diff] [blame] | 959 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | printk(KERN_ERR "ibmvscsi: failed to allocate abort event\n"); |
| 961 | return FAILED; |
| 962 | } |
| 963 | |
| 964 | init_event_struct(evt, |
| 965 | sync_completion, |
| 966 | VIOSRP_SRP_FORMAT, |
| 967 | init_timeout * HZ); |
| 968 | |
| 969 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
| 970 | |
| 971 | /* Set up an abort SRP command */ |
| 972 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 973 | tsk_mgmt->opcode = SRP_TSK_MGMT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | tsk_mgmt->lun = ((u64) lun) << 48; |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 975 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; |
| 976 | tsk_mgmt->task_tag = (u64) found_evt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | |
| 978 | printk(KERN_INFO "ibmvscsi: aborting command. lun 0x%lx, tag 0x%lx\n", |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 979 | tsk_mgmt->lun, tsk_mgmt->task_tag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | |
| 981 | evt->sync_srp = &srp_rsp; |
| 982 | init_completion(&evt->comp); |
Dave C Boutcher | be042f2 | 2005-08-15 16:52:58 -0500 | [diff] [blame] | 983 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata); |
| 984 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 985 | if (rsp_rc != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | printk(KERN_ERR "ibmvscsi: failed to send abort() event\n"); |
| 987 | return FAILED; |
| 988 | } |
| 989 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | wait_for_completion(&evt->comp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | |
| 992 | /* make sure we got a good response */ |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 993 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | if (printk_ratelimit()) |
| 995 | printk(KERN_WARNING |
| 996 | "ibmvscsi: abort bad SRP RSP type %d\n", |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 997 | srp_rsp.srp.rsp.opcode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | return FAILED; |
| 999 | } |
| 1000 | |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 1001 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
| 1002 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | else |
| 1004 | rsp_rc = srp_rsp.srp.rsp.status; |
| 1005 | |
| 1006 | if (rsp_rc) { |
| 1007 | if (printk_ratelimit()) |
| 1008 | printk(KERN_WARNING |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 1009 | "ibmvscsi: abort code %d for task tag 0x%lx\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | rsp_rc, |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 1011 | tsk_mgmt->task_tag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | return FAILED; |
| 1013 | } |
| 1014 | |
| 1015 | /* Because we dropped the spinlock above, it's possible |
| 1016 | * The event is no longer in our list. Make sure it didn't |
| 1017 | * complete while we were aborting |
| 1018 | */ |
Dave C Boutcher | be042f2 | 2005-08-15 16:52:58 -0500 | [diff] [blame] | 1019 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | found_evt = NULL; |
| 1021 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { |
| 1022 | if (tmp_evt->cmnd == cmd) { |
| 1023 | found_evt = tmp_evt; |
| 1024 | break; |
| 1025 | } |
| 1026 | } |
| 1027 | |
| 1028 | if (found_evt == NULL) { |
Dave C Boutcher | be042f2 | 2005-08-15 16:52:58 -0500 | [diff] [blame] | 1029 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | printk(KERN_INFO |
| 1031 | "ibmvscsi: aborted task tag 0x%lx completed\n", |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 1032 | tsk_mgmt->task_tag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | return SUCCESS; |
| 1034 | } |
| 1035 | |
| 1036 | printk(KERN_INFO |
| 1037 | "ibmvscsi: successfully aborted task tag 0x%lx\n", |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 1038 | tsk_mgmt->task_tag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | |
| 1040 | cmd->result = (DID_ABORT << 16); |
| 1041 | list_del(&found_evt->list); |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 1042 | unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, |
| 1043 | found_evt->hostdata->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | free_event_struct(&found_evt->hostdata->pool, found_evt); |
Dave C Boutcher | be042f2 | 2005-08-15 16:52:58 -0500 | [diff] [blame] | 1045 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | atomic_inc(&hostdata->request_limit); |
| 1047 | return SUCCESS; |
| 1048 | } |
| 1049 | |
| 1050 | /** |
| 1051 | * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host |
| 1052 | * template send this over to the server and wait synchronously for the |
| 1053 | * response |
| 1054 | */ |
| 1055 | static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) |
| 1056 | { |
| 1057 | struct ibmvscsi_host_data *hostdata = |
| 1058 | (struct ibmvscsi_host_data *)cmd->device->host->hostdata; |
| 1059 | |
| 1060 | struct srp_tsk_mgmt *tsk_mgmt; |
| 1061 | struct srp_event_struct *evt; |
| 1062 | struct srp_event_struct *tmp_evt, *pos; |
| 1063 | union viosrp_iu srp_rsp; |
| 1064 | int rsp_rc; |
Dave C Boutcher | be042f2 | 2005-08-15 16:52:58 -0500 | [diff] [blame] | 1065 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | u16 lun = lun_from_dev(cmd->device); |
| 1067 | |
Dave C Boutcher | be042f2 | 2005-08-15 16:52:58 -0500 | [diff] [blame] | 1068 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | evt = get_event_struct(&hostdata->pool); |
| 1070 | if (evt == NULL) { |
Dave C Boutcher | be042f2 | 2005-08-15 16:52:58 -0500 | [diff] [blame] | 1071 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | printk(KERN_ERR "ibmvscsi: failed to allocate reset event\n"); |
| 1073 | return FAILED; |
| 1074 | } |
| 1075 | |
| 1076 | init_event_struct(evt, |
| 1077 | sync_completion, |
| 1078 | VIOSRP_SRP_FORMAT, |
| 1079 | init_timeout * HZ); |
| 1080 | |
| 1081 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
| 1082 | |
| 1083 | /* Set up a lun reset SRP command */ |
| 1084 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 1085 | tsk_mgmt->opcode = SRP_TSK_MGMT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | tsk_mgmt->lun = ((u64) lun) << 48; |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 1087 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | |
| 1089 | printk(KERN_INFO "ibmvscsi: resetting device. lun 0x%lx\n", |
| 1090 | tsk_mgmt->lun); |
| 1091 | |
| 1092 | evt->sync_srp = &srp_rsp; |
| 1093 | init_completion(&evt->comp); |
Dave C Boutcher | be042f2 | 2005-08-15 16:52:58 -0500 | [diff] [blame] | 1094 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata); |
| 1095 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1096 | if (rsp_rc != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | printk(KERN_ERR "ibmvscsi: failed to send reset event\n"); |
| 1098 | return FAILED; |
| 1099 | } |
| 1100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | wait_for_completion(&evt->comp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | |
| 1103 | /* make sure we got a good response */ |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 1104 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | if (printk_ratelimit()) |
| 1106 | printk(KERN_WARNING |
| 1107 | "ibmvscsi: reset bad SRP RSP type %d\n", |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 1108 | srp_rsp.srp.rsp.opcode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | return FAILED; |
| 1110 | } |
| 1111 | |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 1112 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
| 1113 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | else |
| 1115 | rsp_rc = srp_rsp.srp.rsp.status; |
| 1116 | |
| 1117 | if (rsp_rc) { |
| 1118 | if (printk_ratelimit()) |
| 1119 | printk(KERN_WARNING |
| 1120 | "ibmvscsi: reset code %d for task tag 0x%lx\n", |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 1121 | rsp_rc, tsk_mgmt->task_tag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | return FAILED; |
| 1123 | } |
| 1124 | |
| 1125 | /* We need to find all commands for this LUN that have not yet been |
| 1126 | * responded to, and fail them with DID_RESET |
| 1127 | */ |
Dave C Boutcher | be042f2 | 2005-08-15 16:52:58 -0500 | [diff] [blame] | 1128 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
| 1130 | if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { |
| 1131 | if (tmp_evt->cmnd) |
| 1132 | tmp_evt->cmnd->result = (DID_RESET << 16); |
| 1133 | list_del(&tmp_evt->list); |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 1134 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, |
| 1135 | tmp_evt->hostdata->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | free_event_struct(&tmp_evt->hostdata->pool, |
| 1137 | tmp_evt); |
| 1138 | atomic_inc(&hostdata->request_limit); |
| 1139 | if (tmp_evt->cmnd_done) |
| 1140 | tmp_evt->cmnd_done(tmp_evt->cmnd); |
| 1141 | else if (tmp_evt->done) |
| 1142 | tmp_evt->done(tmp_evt); |
| 1143 | } |
| 1144 | } |
Dave C Boutcher | be042f2 | 2005-08-15 16:52:58 -0500 | [diff] [blame] | 1145 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | return SUCCESS; |
| 1147 | } |
| 1148 | |
| 1149 | /** |
| 1150 | * purge_requests: Our virtual adapter just shut down. purge any sent requests |
| 1151 | * @hostdata: the adapter |
| 1152 | */ |
Dave C Boutcher | 2b541f8 | 2006-01-19 13:34:44 -0600 | [diff] [blame] | 1153 | static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | { |
| 1155 | struct srp_event_struct *tmp_evt, *pos; |
| 1156 | unsigned long flags; |
| 1157 | |
| 1158 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
| 1159 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
| 1160 | list_del(&tmp_evt->list); |
| 1161 | if (tmp_evt->cmnd) { |
Dave C Boutcher | 2b541f8 | 2006-01-19 13:34:44 -0600 | [diff] [blame] | 1162 | tmp_evt->cmnd->result = (error_code << 16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 1164 | tmp_evt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | tmp_evt->hostdata->dev); |
| 1166 | if (tmp_evt->cmnd_done) |
| 1167 | tmp_evt->cmnd_done(tmp_evt->cmnd); |
| 1168 | } else { |
| 1169 | if (tmp_evt->done) { |
| 1170 | tmp_evt->done(tmp_evt); |
| 1171 | } |
| 1172 | } |
| 1173 | free_event_struct(&tmp_evt->hostdata->pool, tmp_evt); |
| 1174 | } |
| 1175 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
| 1176 | } |
| 1177 | |
| 1178 | /** |
| 1179 | * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ |
| 1180 | * @crq: Command/Response queue |
| 1181 | * @hostdata: ibmvscsi_host_data of host |
| 1182 | * |
| 1183 | */ |
| 1184 | void ibmvscsi_handle_crq(struct viosrp_crq *crq, |
| 1185 | struct ibmvscsi_host_data *hostdata) |
| 1186 | { |
| 1187 | unsigned long flags; |
| 1188 | struct srp_event_struct *evt_struct = |
| 1189 | (struct srp_event_struct *)crq->IU_data_ptr; |
| 1190 | switch (crq->valid) { |
| 1191 | case 0xC0: /* initialization */ |
| 1192 | switch (crq->format) { |
| 1193 | case 0x01: /* Initialization message */ |
| 1194 | printk(KERN_INFO "ibmvscsi: partner initialized\n"); |
| 1195 | /* Send back a response */ |
| 1196 | if (ibmvscsi_send_crq(hostdata, |
| 1197 | 0xC002000000000000LL, 0) == 0) { |
| 1198 | /* Now login */ |
| 1199 | send_srp_login(hostdata); |
| 1200 | } else { |
| 1201 | printk(KERN_ERR |
| 1202 | "ibmvscsi: Unable to send init rsp\n"); |
| 1203 | } |
| 1204 | |
| 1205 | break; |
| 1206 | case 0x02: /* Initialization response */ |
| 1207 | printk(KERN_INFO |
| 1208 | "ibmvscsi: partner initialization complete\n"); |
| 1209 | |
| 1210 | /* Now login */ |
| 1211 | send_srp_login(hostdata); |
| 1212 | break; |
| 1213 | default: |
| 1214 | printk(KERN_ERR "ibmvscsi: unknown crq message type\n"); |
| 1215 | } |
| 1216 | return; |
Dave C Boutcher | 2b541f8 | 2006-01-19 13:34:44 -0600 | [diff] [blame] | 1217 | case 0xFF: /* Hypervisor telling us the connection is closed */ |
| 1218 | scsi_block_requests(hostdata->host); |
Dave C Boutcher | cefbda2 | 2006-06-12 21:22:51 -0500 | [diff] [blame] | 1219 | atomic_set(&hostdata->request_limit, 0); |
Dave C Boutcher | 2b541f8 | 2006-01-19 13:34:44 -0600 | [diff] [blame] | 1220 | if (crq->format == 0x06) { |
| 1221 | /* We need to re-setup the interpartition connection */ |
| 1222 | printk(KERN_INFO |
| 1223 | "ibmvscsi: Re-enabling adapter!\n"); |
| 1224 | purge_requests(hostdata, DID_REQUEUE); |
Dave C Boutcher | cefbda2 | 2006-06-12 21:22:51 -0500 | [diff] [blame] | 1225 | if ((ibmvscsi_reenable_crq_queue(&hostdata->queue, |
Santiago Leon | 9c3121f | 2006-10-13 10:22:50 -0500 | [diff] [blame] | 1226 | hostdata)) || |
Dave C Boutcher | cefbda2 | 2006-06-12 21:22:51 -0500 | [diff] [blame] | 1227 | (ibmvscsi_send_crq(hostdata, |
| 1228 | 0xC001000000000000LL, 0))) { |
| 1229 | atomic_set(&hostdata->request_limit, |
| 1230 | -1); |
Dave C Boutcher | 2b541f8 | 2006-01-19 13:34:44 -0600 | [diff] [blame] | 1231 | printk(KERN_ERR |
Dave C Boutcher | cefbda2 | 2006-06-12 21:22:51 -0500 | [diff] [blame] | 1232 | "ibmvscsi: error after" |
Dave C Boutcher | 2b541f8 | 2006-01-19 13:34:44 -0600 | [diff] [blame] | 1233 | " enable\n"); |
Dave C Boutcher | cefbda2 | 2006-06-12 21:22:51 -0500 | [diff] [blame] | 1234 | } |
Dave C Boutcher | 2b541f8 | 2006-01-19 13:34:44 -0600 | [diff] [blame] | 1235 | } else { |
| 1236 | printk(KERN_INFO |
| 1237 | "ibmvscsi: Virtual adapter failed rc %d!\n", |
| 1238 | crq->format); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | |
Dave C Boutcher | 2b541f8 | 2006-01-19 13:34:44 -0600 | [diff] [blame] | 1240 | purge_requests(hostdata, DID_ERROR); |
Dave C Boutcher | cefbda2 | 2006-06-12 21:22:51 -0500 | [diff] [blame] | 1241 | if ((ibmvscsi_reset_crq_queue(&hostdata->queue, |
| 1242 | hostdata)) || |
| 1243 | (ibmvscsi_send_crq(hostdata, |
| 1244 | 0xC001000000000000LL, 0))) { |
| 1245 | atomic_set(&hostdata->request_limit, |
| 1246 | -1); |
| 1247 | printk(KERN_ERR |
| 1248 | "ibmvscsi: error after reset\n"); |
| 1249 | } |
Dave C Boutcher | 2b541f8 | 2006-01-19 13:34:44 -0600 | [diff] [blame] | 1250 | } |
| 1251 | scsi_unblock_requests(hostdata->host); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | return; |
| 1253 | case 0x80: /* real payload */ |
| 1254 | break; |
| 1255 | default: |
| 1256 | printk(KERN_ERR |
| 1257 | "ibmvscsi: got an invalid message type 0x%02x\n", |
| 1258 | crq->valid); |
| 1259 | return; |
| 1260 | } |
| 1261 | |
| 1262 | /* The only kind of payload CRQs we should get are responses to |
| 1263 | * things we send. Make sure this response is to something we |
| 1264 | * actually sent |
| 1265 | */ |
| 1266 | if (!valid_event_struct(&hostdata->pool, evt_struct)) { |
| 1267 | printk(KERN_ERR |
| 1268 | "ibmvscsi: returned correlation_token 0x%p is invalid!\n", |
| 1269 | (void *)crq->IU_data_ptr); |
| 1270 | return; |
| 1271 | } |
| 1272 | |
| 1273 | if (atomic_read(&evt_struct->free)) { |
| 1274 | printk(KERN_ERR |
| 1275 | "ibmvscsi: received duplicate correlation_token 0x%p!\n", |
| 1276 | (void *)crq->IU_data_ptr); |
| 1277 | return; |
| 1278 | } |
| 1279 | |
| 1280 | if (crq->format == VIOSRP_SRP_FORMAT) |
FUJITA Tomonori | ef26567 | 2006-03-26 03:57:14 +0900 | [diff] [blame] | 1281 | atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | &hostdata->request_limit); |
| 1283 | |
| 1284 | if (evt_struct->done) |
| 1285 | evt_struct->done(evt_struct); |
| 1286 | else |
| 1287 | printk(KERN_ERR |
| 1288 | "ibmvscsi: returned done() is NULL; not running it!\n"); |
| 1289 | |
| 1290 | /* |
| 1291 | * Lock the host_lock before messing with these structures, since we |
| 1292 | * are running in a task context |
| 1293 | */ |
| 1294 | spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); |
| 1295 | list_del(&evt_struct->list); |
| 1296 | free_event_struct(&evt_struct->hostdata->pool, evt_struct); |
| 1297 | spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); |
| 1298 | } |
| 1299 | |
| 1300 | /** |
| 1301 | * ibmvscsi_get_host_config: Send the command to the server to get host |
| 1302 | * configuration data. The data is opaque to us. |
| 1303 | */ |
| 1304 | static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata, |
| 1305 | unsigned char *buffer, int length) |
| 1306 | { |
| 1307 | struct viosrp_host_config *host_config; |
| 1308 | struct srp_event_struct *evt_struct; |
FUJITA Tomonori | e5dbfa6 | 2006-04-14 13:52:18 +0900 | [diff] [blame] | 1309 | dma_addr_t addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | int rc; |
| 1311 | |
| 1312 | evt_struct = get_event_struct(&hostdata->pool); |
| 1313 | if (!evt_struct) { |
| 1314 | printk(KERN_ERR |
| 1315 | "ibmvscsi: could't allocate event for HOST_CONFIG!\n"); |
| 1316 | return -1; |
| 1317 | } |
| 1318 | |
| 1319 | init_event_struct(evt_struct, |
| 1320 | sync_completion, |
| 1321 | VIOSRP_MAD_FORMAT, |
| 1322 | init_timeout * HZ); |
| 1323 | |
| 1324 | host_config = &evt_struct->iu.mad.host_config; |
| 1325 | |
| 1326 | /* Set up a lun reset SRP command */ |
| 1327 | memset(host_config, 0x00, sizeof(*host_config)); |
| 1328 | host_config->common.type = VIOSRP_HOST_CONFIG_TYPE; |
| 1329 | host_config->common.length = length; |
FUJITA Tomonori | e5dbfa6 | 2006-04-14 13:52:18 +0900 | [diff] [blame] | 1330 | host_config->buffer = addr = dma_map_single(hostdata->dev, buffer, |
| 1331 | length, |
| 1332 | DMA_BIDIRECTIONAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | |
| 1334 | if (dma_mapping_error(host_config->buffer)) { |
| 1335 | printk(KERN_ERR |
| 1336 | "ibmvscsi: dma_mapping error " "getting host config\n"); |
| 1337 | free_event_struct(&hostdata->pool, evt_struct); |
| 1338 | return -1; |
| 1339 | } |
| 1340 | |
| 1341 | init_completion(&evt_struct->comp); |
| 1342 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata); |
FUJITA Tomonori | e5dbfa6 | 2006-04-14 13:52:18 +0900 | [diff] [blame] | 1343 | if (rc == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | wait_for_completion(&evt_struct->comp); |
FUJITA Tomonori | e5dbfa6 | 2006-04-14 13:52:18 +0900 | [diff] [blame] | 1345 | dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | |
| 1347 | return rc; |
| 1348 | } |
| 1349 | |
Robert Jennings | 0979c84 | 2007-03-29 12:30:40 -0500 | [diff] [blame] | 1350 | /** |
| 1351 | * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk. |
| 1352 | * @sdev: struct scsi_device device to configure |
| 1353 | * |
| 1354 | * Enable allow_restart for a device if it is a disk. Adjust the |
| 1355 | * queue_depth here also as is required by the documentation for |
| 1356 | * struct scsi_host_template. |
| 1357 | */ |
| 1358 | static int ibmvscsi_slave_configure(struct scsi_device *sdev) |
| 1359 | { |
| 1360 | struct Scsi_Host *shost = sdev->host; |
| 1361 | unsigned long lock_flags = 0; |
| 1362 | |
| 1363 | spin_lock_irqsave(shost->host_lock, lock_flags); |
| 1364 | if (sdev->type == TYPE_DISK) |
| 1365 | sdev->allow_restart = 1; |
| 1366 | scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun); |
| 1367 | spin_unlock_irqrestore(shost->host_lock, lock_flags); |
| 1368 | return 0; |
| 1369 | } |
| 1370 | |
Brian King | 742d25b | 2007-05-29 15:46:14 -0500 | [diff] [blame] | 1371 | /** |
| 1372 | * ibmvscsi_change_queue_depth - Change the device's queue depth |
| 1373 | * @sdev: scsi device struct |
| 1374 | * @qdepth: depth to set |
| 1375 | * |
| 1376 | * Return value: |
| 1377 | * actual depth set |
| 1378 | **/ |
| 1379 | static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) |
| 1380 | { |
| 1381 | if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN) |
| 1382 | qdepth = IBMVSCSI_MAX_CMDS_PER_LUN; |
| 1383 | |
| 1384 | scsi_adjust_queue_depth(sdev, 0, qdepth); |
| 1385 | return sdev->queue_depth; |
| 1386 | } |
| 1387 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | /* ------------------------------------------------------------ |
| 1389 | * sysfs attributes |
| 1390 | */ |
| 1391 | static ssize_t show_host_srp_version(struct class_device *class_dev, char *buf) |
| 1392 | { |
| 1393 | struct Scsi_Host *shost = class_to_shost(class_dev); |
| 1394 | struct ibmvscsi_host_data *hostdata = |
| 1395 | (struct ibmvscsi_host_data *)shost->hostdata; |
| 1396 | int len; |
| 1397 | |
| 1398 | len = snprintf(buf, PAGE_SIZE, "%s\n", |
| 1399 | hostdata->madapter_info.srp_version); |
| 1400 | return len; |
| 1401 | } |
| 1402 | |
| 1403 | static struct class_device_attribute ibmvscsi_host_srp_version = { |
| 1404 | .attr = { |
| 1405 | .name = "srp_version", |
| 1406 | .mode = S_IRUGO, |
| 1407 | }, |
| 1408 | .show = show_host_srp_version, |
| 1409 | }; |
| 1410 | |
| 1411 | static ssize_t show_host_partition_name(struct class_device *class_dev, |
| 1412 | char *buf) |
| 1413 | { |
| 1414 | struct Scsi_Host *shost = class_to_shost(class_dev); |
| 1415 | struct ibmvscsi_host_data *hostdata = |
| 1416 | (struct ibmvscsi_host_data *)shost->hostdata; |
| 1417 | int len; |
| 1418 | |
| 1419 | len = snprintf(buf, PAGE_SIZE, "%s\n", |
| 1420 | hostdata->madapter_info.partition_name); |
| 1421 | return len; |
| 1422 | } |
| 1423 | |
| 1424 | static struct class_device_attribute ibmvscsi_host_partition_name = { |
| 1425 | .attr = { |
| 1426 | .name = "partition_name", |
| 1427 | .mode = S_IRUGO, |
| 1428 | }, |
| 1429 | .show = show_host_partition_name, |
| 1430 | }; |
| 1431 | |
| 1432 | static ssize_t show_host_partition_number(struct class_device *class_dev, |
| 1433 | char *buf) |
| 1434 | { |
| 1435 | struct Scsi_Host *shost = class_to_shost(class_dev); |
| 1436 | struct ibmvscsi_host_data *hostdata = |
| 1437 | (struct ibmvscsi_host_data *)shost->hostdata; |
| 1438 | int len; |
| 1439 | |
| 1440 | len = snprintf(buf, PAGE_SIZE, "%d\n", |
| 1441 | hostdata->madapter_info.partition_number); |
| 1442 | return len; |
| 1443 | } |
| 1444 | |
| 1445 | static struct class_device_attribute ibmvscsi_host_partition_number = { |
| 1446 | .attr = { |
| 1447 | .name = "partition_number", |
| 1448 | .mode = S_IRUGO, |
| 1449 | }, |
| 1450 | .show = show_host_partition_number, |
| 1451 | }; |
| 1452 | |
| 1453 | static ssize_t show_host_mad_version(struct class_device *class_dev, char *buf) |
| 1454 | { |
| 1455 | struct Scsi_Host *shost = class_to_shost(class_dev); |
| 1456 | struct ibmvscsi_host_data *hostdata = |
| 1457 | (struct ibmvscsi_host_data *)shost->hostdata; |
| 1458 | int len; |
| 1459 | |
| 1460 | len = snprintf(buf, PAGE_SIZE, "%d\n", |
| 1461 | hostdata->madapter_info.mad_version); |
| 1462 | return len; |
| 1463 | } |
| 1464 | |
| 1465 | static struct class_device_attribute ibmvscsi_host_mad_version = { |
| 1466 | .attr = { |
| 1467 | .name = "mad_version", |
| 1468 | .mode = S_IRUGO, |
| 1469 | }, |
| 1470 | .show = show_host_mad_version, |
| 1471 | }; |
| 1472 | |
| 1473 | static ssize_t show_host_os_type(struct class_device *class_dev, char *buf) |
| 1474 | { |
| 1475 | struct Scsi_Host *shost = class_to_shost(class_dev); |
| 1476 | struct ibmvscsi_host_data *hostdata = |
| 1477 | (struct ibmvscsi_host_data *)shost->hostdata; |
| 1478 | int len; |
| 1479 | |
| 1480 | len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type); |
| 1481 | return len; |
| 1482 | } |
| 1483 | |
| 1484 | static struct class_device_attribute ibmvscsi_host_os_type = { |
| 1485 | .attr = { |
| 1486 | .name = "os_type", |
| 1487 | .mode = S_IRUGO, |
| 1488 | }, |
| 1489 | .show = show_host_os_type, |
| 1490 | }; |
| 1491 | |
| 1492 | static ssize_t show_host_config(struct class_device *class_dev, char *buf) |
| 1493 | { |
| 1494 | struct Scsi_Host *shost = class_to_shost(class_dev); |
| 1495 | struct ibmvscsi_host_data *hostdata = |
| 1496 | (struct ibmvscsi_host_data *)shost->hostdata; |
| 1497 | |
| 1498 | /* returns null-terminated host config data */ |
| 1499 | if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0) |
| 1500 | return strlen(buf); |
| 1501 | else |
| 1502 | return 0; |
| 1503 | } |
| 1504 | |
| 1505 | static struct class_device_attribute ibmvscsi_host_config = { |
| 1506 | .attr = { |
| 1507 | .name = "config", |
| 1508 | .mode = S_IRUGO, |
| 1509 | }, |
| 1510 | .show = show_host_config, |
| 1511 | }; |
| 1512 | |
| 1513 | static struct class_device_attribute *ibmvscsi_attrs[] = { |
| 1514 | &ibmvscsi_host_srp_version, |
| 1515 | &ibmvscsi_host_partition_name, |
| 1516 | &ibmvscsi_host_partition_number, |
| 1517 | &ibmvscsi_host_mad_version, |
| 1518 | &ibmvscsi_host_os_type, |
| 1519 | &ibmvscsi_host_config, |
| 1520 | NULL |
| 1521 | }; |
| 1522 | |
| 1523 | /* ------------------------------------------------------------ |
| 1524 | * SCSI driver registration |
| 1525 | */ |
| 1526 | static struct scsi_host_template driver_template = { |
| 1527 | .module = THIS_MODULE, |
| 1528 | .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, |
| 1529 | .proc_name = "ibmvscsi", |
| 1530 | .queuecommand = ibmvscsi_queuecommand, |
| 1531 | .eh_abort_handler = ibmvscsi_eh_abort_handler, |
| 1532 | .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, |
Robert Jennings | 0979c84 | 2007-03-29 12:30:40 -0500 | [diff] [blame] | 1533 | .slave_configure = ibmvscsi_slave_configure, |
Brian King | 742d25b | 2007-05-29 15:46:14 -0500 | [diff] [blame] | 1534 | .change_queue_depth = ibmvscsi_change_queue_depth, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | .cmd_per_lun = 16, |
Robert Jennings | a897ff2 | 2007-03-28 12:45:46 -0500 | [diff] [blame] | 1536 | .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | .this_id = -1, |
James Bottomley | 4dddbc2 | 2005-09-06 17:11:54 -0500 | [diff] [blame] | 1538 | .sg_tablesize = SG_ALL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | .use_clustering = ENABLE_CLUSTERING, |
| 1540 | .shost_attrs = ibmvscsi_attrs, |
| 1541 | }; |
| 1542 | |
| 1543 | /** |
| 1544 | * Called by bus code for each adapter |
| 1545 | */ |
| 1546 | static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) |
| 1547 | { |
| 1548 | struct ibmvscsi_host_data *hostdata; |
| 1549 | struct Scsi_Host *host; |
| 1550 | struct device *dev = &vdev->dev; |
| 1551 | unsigned long wait_switch = 0; |
Dave C Boutcher | cefbda2 | 2006-06-12 21:22:51 -0500 | [diff] [blame] | 1552 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | |
| 1554 | vdev->dev.driver_data = NULL; |
| 1555 | |
Robert Jennings | a897ff2 | 2007-03-28 12:45:46 -0500 | [diff] [blame] | 1556 | driver_template.can_queue = max_requests; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); |
| 1558 | if (!host) { |
| 1559 | printk(KERN_ERR "ibmvscsi: couldn't allocate host data\n"); |
| 1560 | goto scsi_host_alloc_failed; |
| 1561 | } |
| 1562 | |
| 1563 | hostdata = (struct ibmvscsi_host_data *)host->hostdata; |
| 1564 | memset(hostdata, 0x00, sizeof(*hostdata)); |
| 1565 | INIT_LIST_HEAD(&hostdata->sent); |
| 1566 | hostdata->host = host; |
| 1567 | hostdata->dev = dev; |
| 1568 | atomic_set(&hostdata->request_limit, -1); |
| 1569 | hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */ |
| 1570 | |
Dave C Boutcher | cefbda2 | 2006-06-12 21:22:51 -0500 | [diff] [blame] | 1571 | rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_requests); |
| 1572 | if (rc != 0 && rc != H_RESOURCE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | printk(KERN_ERR "ibmvscsi: couldn't initialize crq\n"); |
| 1574 | goto init_crq_failed; |
| 1575 | } |
| 1576 | if (initialize_event_pool(&hostdata->pool, max_requests, hostdata) != 0) { |
| 1577 | printk(KERN_ERR "ibmvscsi: couldn't initialize event pool\n"); |
| 1578 | goto init_pool_failed; |
| 1579 | } |
| 1580 | |
| 1581 | host->max_lun = 8; |
| 1582 | host->max_id = max_id; |
| 1583 | host->max_channel = max_channel; |
| 1584 | |
| 1585 | if (scsi_add_host(hostdata->host, hostdata->dev)) |
| 1586 | goto add_host_failed; |
| 1587 | |
| 1588 | /* Try to send an initialization message. Note that this is allowed |
| 1589 | * to fail if the other end is not acive. In that case we don't |
| 1590 | * want to scan |
| 1591 | */ |
Dave C Boutcher | cefbda2 | 2006-06-12 21:22:51 -0500 | [diff] [blame] | 1592 | if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0 |
| 1593 | || rc == H_RESOURCE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | /* |
| 1595 | * Wait around max init_timeout secs for the adapter to finish |
| 1596 | * initializing. When we are done initializing, we will have a |
| 1597 | * valid request_limit. We don't want Linux scanning before |
| 1598 | * we are ready. |
| 1599 | */ |
| 1600 | for (wait_switch = jiffies + (init_timeout * HZ); |
| 1601 | time_before(jiffies, wait_switch) && |
| 1602 | atomic_read(&hostdata->request_limit) < 2;) { |
| 1603 | |
| 1604 | msleep(10); |
| 1605 | } |
| 1606 | |
| 1607 | /* if we now have a valid request_limit, initiate a scan */ |
| 1608 | if (atomic_read(&hostdata->request_limit) > 0) |
| 1609 | scsi_scan_host(host); |
| 1610 | } |
| 1611 | |
| 1612 | vdev->dev.driver_data = hostdata; |
| 1613 | return 0; |
| 1614 | |
| 1615 | add_host_failed: |
| 1616 | release_event_pool(&hostdata->pool, hostdata); |
| 1617 | init_pool_failed: |
| 1618 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_requests); |
| 1619 | init_crq_failed: |
| 1620 | scsi_host_put(host); |
| 1621 | scsi_host_alloc_failed: |
| 1622 | return -1; |
| 1623 | } |
| 1624 | |
| 1625 | static int ibmvscsi_remove(struct vio_dev *vdev) |
| 1626 | { |
| 1627 | struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data; |
| 1628 | release_event_pool(&hostdata->pool, hostdata); |
| 1629 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, |
| 1630 | max_requests); |
| 1631 | |
| 1632 | scsi_remove_host(hostdata->host); |
| 1633 | scsi_host_put(hostdata->host); |
| 1634 | |
| 1635 | return 0; |
| 1636 | } |
| 1637 | |
| 1638 | /** |
| 1639 | * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we |
| 1640 | * support. |
| 1641 | */ |
| 1642 | static struct vio_device_id ibmvscsi_device_table[] __devinitdata = { |
| 1643 | {"vscsi", "IBM,v-scsi"}, |
Stephen Rothwell | fb120da | 2005-08-17 16:42:59 +1000 | [diff] [blame] | 1644 | { "", "" } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
Stephen Rothwell | 915124d | 2005-10-24 15:12:22 +1000 | [diff] [blame] | 1647 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | static struct vio_driver ibmvscsi_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | .id_table = ibmvscsi_device_table, |
| 1650 | .probe = ibmvscsi_probe, |
Stephen Rothwell | 6fdf539 | 2005-10-24 14:53:21 +1000 | [diff] [blame] | 1651 | .remove = ibmvscsi_remove, |
| 1652 | .driver = { |
| 1653 | .name = "ibmvscsi", |
Stephen Rothwell | 915124d | 2005-10-24 15:12:22 +1000 | [diff] [blame] | 1654 | .owner = THIS_MODULE, |
Stephen Rothwell | 6fdf539 | 2005-10-24 14:53:21 +1000 | [diff] [blame] | 1655 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | }; |
| 1657 | |
| 1658 | int __init ibmvscsi_module_init(void) |
| 1659 | { |
| 1660 | return vio_register_driver(&ibmvscsi_driver); |
| 1661 | } |
| 1662 | |
| 1663 | void __exit ibmvscsi_module_exit(void) |
| 1664 | { |
| 1665 | vio_unregister_driver(&ibmvscsi_driver); |
| 1666 | } |
| 1667 | |
| 1668 | module_init(ibmvscsi_module_init); |
| 1669 | module_exit(ibmvscsi_module_exit); |