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1da177e4 LT |
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 | |
9b7dac08 | 43 | * puts the message in the next 16 byte space in round-robin fashion, |
1da177e4 LT |
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 | * | |
7834799a | 58 | * TODO: This is currently pretty tied to the IBM pSeries hypervisor |
1da177e4 LT |
59 | * interfaces. It would be really nice to abstract this above an RDMA |
60 | * layer. | |
61 | */ | |
62 | ||
63 | #include <linux/module.h> | |
64 | #include <linux/moduleparam.h> | |
65 | #include <linux/dma-mapping.h> | |
66 | #include <linux/delay.h> | |
5a0e3ad6 | 67 | #include <linux/slab.h> |
126c5cc3 | 68 | #include <linux/of.h> |
64355b92 | 69 | #include <linux/pm.h> |
0f33ece5 | 70 | #include <linux/kthread.h> |
d3849d51 | 71 | #include <asm/firmware.h> |
1da177e4 LT |
72 | #include <asm/vio.h> |
73 | #include <scsi/scsi.h> | |
74 | #include <scsi/scsi_cmnd.h> | |
75 | #include <scsi/scsi_host.h> | |
76 | #include <scsi/scsi_device.h> | |
4d680419 | 77 | #include <scsi/scsi_transport_srp.h> |
1da177e4 LT |
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; | |
e1a5ce5b RJ |
87 | static int init_timeout = 300; |
88 | static int login_timeout = 60; | |
89 | static int info_timeout = 30; | |
90 | static int abort_timeout = 60; | |
91 | static int reset_timeout = 60; | |
a897ff2a | 92 | static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT; |
4f10aae0 | 93 | static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2; |
c1988e31 | 94 | static int fast_fail = 1; |
126c5cc3 | 95 | static int client_reserve = 1; |
9965c2f1 BH |
96 | static char partition_name[97] = "UNKNOWN"; |
97 | static unsigned int partition_number = -1; | |
32d6e4b6 | 98 | static LIST_HEAD(ibmvscsi_head); |
1da177e4 | 99 | |
4d680419 FT |
100 | static struct scsi_transport_template *ibmvscsi_transport_template; |
101 | ||
aac3118d | 102 | #define IBMVSCSI_VERSION "1.5.9" |
1da177e4 LT |
103 | |
104 | MODULE_DESCRIPTION("IBM Virtual SCSI"); | |
105 | MODULE_AUTHOR("Dave Boutcher"); | |
106 | MODULE_LICENSE("GPL"); | |
107 | MODULE_VERSION(IBMVSCSI_VERSION); | |
108 | ||
109 | module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR); | |
e3678a0c | 110 | MODULE_PARM_DESC(max_id, "Largest ID value for each channel [Default=64]"); |
1da177e4 | 111 | module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); |
e3678a0c | 112 | MODULE_PARM_DESC(max_channel, "Largest channel value [Default=3]"); |
1da177e4 LT |
113 | module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR); |
114 | MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds"); | |
21465eda | 115 | module_param_named(max_requests, max_requests, int, S_IRUGO); |
1da177e4 | 116 | MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter"); |
c1988e31 RJ |
117 | module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR); |
118 | MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]"); | |
126c5cc3 BK |
119 | module_param_named(client_reserve, client_reserve, int, S_IRUGO ); |
120 | MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release"); | |
1da177e4 | 121 | |
9965c2f1 BH |
122 | static void ibmvscsi_handle_crq(struct viosrp_crq *crq, |
123 | struct ibmvscsi_host_data *hostdata); | |
124 | ||
125 | /* ------------------------------------------------------------ | |
126 | * Routines for managing the command/response queue | |
127 | */ | |
128 | /** | |
129 | * ibmvscsi_handle_event: - Interrupt handler for crq events | |
130 | * @irq: number of irq to handle, not used | |
131 | * @dev_instance: ibmvscsi_host_data of host that received interrupt | |
132 | * | |
133 | * Disables interrupts and schedules srp_task | |
134 | * Always returns IRQ_HANDLED | |
135 | */ | |
136 | static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance) | |
137 | { | |
138 | struct ibmvscsi_host_data *hostdata = | |
139 | (struct ibmvscsi_host_data *)dev_instance; | |
140 | vio_disable_interrupts(to_vio_dev(hostdata->dev)); | |
141 | tasklet_schedule(&hostdata->srp_task); | |
142 | return IRQ_HANDLED; | |
143 | } | |
144 | ||
145 | /** | |
146 | * release_crq_queue: - Deallocates data and unregisters CRQ | |
147 | * @queue: crq_queue to initialize and register | |
148 | * @host_data: ibmvscsi_host_data of host | |
149 | * | |
150 | * Frees irq, deallocates a page for messages, unmaps dma, and unregisters | |
151 | * the crq with the hypervisor. | |
152 | */ | |
153 | static void ibmvscsi_release_crq_queue(struct crq_queue *queue, | |
154 | struct ibmvscsi_host_data *hostdata, | |
155 | int max_requests) | |
156 | { | |
157 | long rc = 0; | |
158 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
159 | free_irq(vdev->irq, (void *)hostdata); | |
160 | tasklet_kill(&hostdata->srp_task); | |
161 | do { | |
162 | if (rc) | |
163 | msleep(100); | |
164 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
165 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
166 | dma_unmap_single(hostdata->dev, | |
167 | queue->msg_token, | |
168 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); | |
169 | free_page((unsigned long)queue->msgs); | |
170 | } | |
171 | ||
172 | /** | |
173 | * crq_queue_next_crq: - Returns the next entry in message queue | |
174 | * @queue: crq_queue to use | |
175 | * | |
176 | * Returns pointer to next entry in queue, or NULL if there are no new | |
177 | * entried in the CRQ. | |
178 | */ | |
179 | static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue) | |
180 | { | |
181 | struct viosrp_crq *crq; | |
182 | unsigned long flags; | |
183 | ||
184 | spin_lock_irqsave(&queue->lock, flags); | |
185 | crq = &queue->msgs[queue->cur]; | |
55c9b1e5 | 186 | if (crq->valid != VIOSRP_CRQ_FREE) { |
9965c2f1 BH |
187 | if (++queue->cur == queue->size) |
188 | queue->cur = 0; | |
7114aae0 BK |
189 | |
190 | /* Ensure the read of the valid bit occurs before reading any | |
191 | * other bits of the CRQ entry | |
192 | */ | |
193 | rmb(); | |
9965c2f1 BH |
194 | } else |
195 | crq = NULL; | |
196 | spin_unlock_irqrestore(&queue->lock, flags); | |
197 | ||
198 | return crq; | |
199 | } | |
200 | ||
201 | /** | |
202 | * ibmvscsi_send_crq: - Send a CRQ | |
203 | * @hostdata: the adapter | |
204 | * @word1: the first 64 bits of the data | |
205 | * @word2: the second 64 bits of the data | |
206 | */ | |
207 | static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, | |
208 | u64 word1, u64 word2) | |
209 | { | |
210 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
211 | ||
7114aae0 BK |
212 | /* |
213 | * Ensure the command buffer is flushed to memory before handing it | |
214 | * over to the VIOS to prevent it from fetching any stale data. | |
215 | */ | |
216 | mb(); | |
9965c2f1 BH |
217 | return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); |
218 | } | |
219 | ||
220 | /** | |
221 | * ibmvscsi_task: - Process srps asynchronously | |
222 | * @data: ibmvscsi_host_data of host | |
223 | */ | |
224 | static void ibmvscsi_task(void *data) | |
225 | { | |
226 | struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data; | |
227 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
228 | struct viosrp_crq *crq; | |
229 | int done = 0; | |
230 | ||
231 | while (!done) { | |
232 | /* Pull all the valid messages off the CRQ */ | |
233 | while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { | |
234 | ibmvscsi_handle_crq(crq, hostdata); | |
55c9b1e5 | 235 | crq->valid = VIOSRP_CRQ_FREE; |
b39205d2 | 236 | wmb(); |
9965c2f1 BH |
237 | } |
238 | ||
239 | vio_enable_interrupts(vdev); | |
240 | crq = crq_queue_next_crq(&hostdata->queue); | |
241 | if (crq != NULL) { | |
242 | vio_disable_interrupts(vdev); | |
243 | ibmvscsi_handle_crq(crq, hostdata); | |
55c9b1e5 | 244 | crq->valid = VIOSRP_CRQ_FREE; |
b39205d2 | 245 | wmb(); |
9965c2f1 BH |
246 | } else { |
247 | done = 1; | |
248 | } | |
249 | } | |
250 | } | |
251 | ||
252 | static void gather_partition_info(void) | |
253 | { | |
9965c2f1 | 254 | const char *ppartition_name; |
72264eb6 | 255 | const __be32 *p_number_ptr; |
9965c2f1 BH |
256 | |
257 | /* Retrieve information about this partition */ | |
5114d6a7 | 258 | if (!of_root) |
9965c2f1 | 259 | return; |
9965c2f1 | 260 | |
5114d6a7 TD |
261 | of_node_get(of_root); |
262 | ||
263 | ppartition_name = of_get_property(of_root, "ibm,partition-name", NULL); | |
9965c2f1 BH |
264 | if (ppartition_name) |
265 | strncpy(partition_name, ppartition_name, | |
266 | sizeof(partition_name)); | |
5114d6a7 | 267 | p_number_ptr = of_get_property(of_root, "ibm,partition-no", NULL); |
9965c2f1 | 268 | if (p_number_ptr) |
72264eb6 | 269 | partition_number = of_read_number(p_number_ptr, 1); |
5114d6a7 | 270 | of_node_put(of_root); |
9965c2f1 BH |
271 | } |
272 | ||
273 | static void set_adapter_info(struct ibmvscsi_host_data *hostdata) | |
274 | { | |
275 | memset(&hostdata->madapter_info, 0x00, | |
276 | sizeof(hostdata->madapter_info)); | |
277 | ||
278 | dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION); | |
279 | strcpy(hostdata->madapter_info.srp_version, SRP_VERSION); | |
280 | ||
281 | strncpy(hostdata->madapter_info.partition_name, partition_name, | |
282 | sizeof(hostdata->madapter_info.partition_name)); | |
283 | ||
72264eb6 AB |
284 | hostdata->madapter_info.partition_number = |
285 | cpu_to_be32(partition_number); | |
9965c2f1 | 286 | |
45d8c30f TD |
287 | hostdata->madapter_info.mad_version = cpu_to_be32(SRP_MAD_VERSION_1); |
288 | hostdata->madapter_info.os_type = cpu_to_be32(SRP_MAD_OS_LINUX); | |
9965c2f1 BH |
289 | } |
290 | ||
291 | /** | |
292 | * reset_crq_queue: - resets a crq after a failure | |
293 | * @queue: crq_queue to initialize and register | |
294 | * @hostdata: ibmvscsi_host_data of host | |
295 | * | |
296 | */ | |
297 | static int ibmvscsi_reset_crq_queue(struct crq_queue *queue, | |
298 | struct ibmvscsi_host_data *hostdata) | |
299 | { | |
300 | int rc = 0; | |
301 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
302 | ||
303 | /* Close the CRQ */ | |
304 | do { | |
305 | if (rc) | |
306 | msleep(100); | |
307 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
308 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
309 | ||
310 | /* Clean out the queue */ | |
311 | memset(queue->msgs, 0x00, PAGE_SIZE); | |
312 | queue->cur = 0; | |
313 | ||
314 | set_adapter_info(hostdata); | |
315 | ||
316 | /* And re-open it again */ | |
317 | rc = plpar_hcall_norets(H_REG_CRQ, | |
318 | vdev->unit_address, | |
319 | queue->msg_token, PAGE_SIZE); | |
06cdbeff | 320 | if (rc == H_CLOSED) { |
9965c2f1 BH |
321 | /* Adapter is good, but other end is not ready */ |
322 | dev_warn(hostdata->dev, "Partner adapter not ready\n"); | |
323 | } else if (rc != 0) { | |
324 | dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc); | |
325 | } | |
326 | return rc; | |
327 | } | |
328 | ||
329 | /** | |
330 | * initialize_crq_queue: - Initializes and registers CRQ with hypervisor | |
331 | * @queue: crq_queue to initialize and register | |
332 | * @hostdata: ibmvscsi_host_data of host | |
333 | * | |
334 | * Allocates a page for messages, maps it for dma, and registers | |
335 | * the crq with the hypervisor. | |
336 | * Returns zero on success. | |
337 | */ | |
338 | static int ibmvscsi_init_crq_queue(struct crq_queue *queue, | |
339 | struct ibmvscsi_host_data *hostdata, | |
340 | int max_requests) | |
341 | { | |
342 | int rc; | |
343 | int retrc; | |
344 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
345 | ||
346 | queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); | |
347 | ||
348 | if (!queue->msgs) | |
349 | goto malloc_failed; | |
350 | queue->size = PAGE_SIZE / sizeof(*queue->msgs); | |
351 | ||
352 | queue->msg_token = dma_map_single(hostdata->dev, queue->msgs, | |
353 | queue->size * sizeof(*queue->msgs), | |
354 | DMA_BIDIRECTIONAL); | |
355 | ||
356 | if (dma_mapping_error(hostdata->dev, queue->msg_token)) | |
357 | goto map_failed; | |
358 | ||
359 | gather_partition_info(); | |
360 | set_adapter_info(hostdata); | |
361 | ||
362 | retrc = rc = plpar_hcall_norets(H_REG_CRQ, | |
363 | vdev->unit_address, | |
364 | queue->msg_token, PAGE_SIZE); | |
365 | if (rc == H_RESOURCE) | |
366 | /* maybe kexecing and resource is busy. try a reset */ | |
367 | rc = ibmvscsi_reset_crq_queue(queue, | |
368 | hostdata); | |
369 | ||
06cdbeff | 370 | if (rc == H_CLOSED) { |
9965c2f1 BH |
371 | /* Adapter is good, but other end is not ready */ |
372 | dev_warn(hostdata->dev, "Partner adapter not ready\n"); | |
373 | retrc = 0; | |
374 | } else if (rc != 0) { | |
375 | dev_warn(hostdata->dev, "Error %d opening adapter\n", rc); | |
376 | goto reg_crq_failed; | |
377 | } | |
378 | ||
379 | queue->cur = 0; | |
380 | spin_lock_init(&queue->lock); | |
381 | ||
382 | tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task, | |
383 | (unsigned long)hostdata); | |
384 | ||
385 | if (request_irq(vdev->irq, | |
386 | ibmvscsi_handle_event, | |
387 | 0, "ibmvscsi", (void *)hostdata) != 0) { | |
388 | dev_err(hostdata->dev, "couldn't register irq 0x%x\n", | |
389 | vdev->irq); | |
390 | goto req_irq_failed; | |
391 | } | |
392 | ||
393 | rc = vio_enable_interrupts(vdev); | |
394 | if (rc != 0) { | |
395 | dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc); | |
396 | goto req_irq_failed; | |
397 | } | |
398 | ||
399 | return retrc; | |
400 | ||
401 | req_irq_failed: | |
402 | tasklet_kill(&hostdata->srp_task); | |
403 | rc = 0; | |
404 | do { | |
405 | if (rc) | |
406 | msleep(100); | |
407 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
408 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
409 | reg_crq_failed: | |
410 | dma_unmap_single(hostdata->dev, | |
411 | queue->msg_token, | |
412 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); | |
413 | map_failed: | |
414 | free_page((unsigned long)queue->msgs); | |
415 | malloc_failed: | |
416 | return -1; | |
417 | } | |
418 | ||
419 | /** | |
420 | * reenable_crq_queue: - reenables a crq after | |
421 | * @queue: crq_queue to initialize and register | |
422 | * @hostdata: ibmvscsi_host_data of host | |
423 | * | |
424 | */ | |
425 | static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue, | |
426 | struct ibmvscsi_host_data *hostdata) | |
427 | { | |
428 | int rc = 0; | |
429 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
430 | ||
431 | /* Re-enable the CRQ */ | |
432 | do { | |
433 | if (rc) | |
434 | msleep(100); | |
435 | rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); | |
436 | } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
437 | ||
438 | if (rc) | |
439 | dev_err(hostdata->dev, "Error %d enabling adapter\n", rc); | |
440 | return rc; | |
441 | } | |
442 | ||
1da177e4 LT |
443 | /* ------------------------------------------------------------ |
444 | * Routines for the event pool and event structs | |
445 | */ | |
446 | /** | |
447 | * initialize_event_pool: - Allocates and initializes the event pool for a host | |
448 | * @pool: event_pool to be initialized | |
449 | * @size: Number of events in pool | |
450 | * @hostdata: ibmvscsi_host_data who owns the event pool | |
451 | * | |
452 | * Returns zero on success. | |
453 | */ | |
454 | static int initialize_event_pool(struct event_pool *pool, | |
455 | int size, struct ibmvscsi_host_data *hostdata) | |
456 | { | |
457 | int i; | |
458 | ||
459 | pool->size = size; | |
460 | pool->next = 0; | |
4c021dd1 | 461 | pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); |
1da177e4 LT |
462 | if (!pool->events) |
463 | return -ENOMEM; | |
1da177e4 LT |
464 | |
465 | pool->iu_storage = | |
466 | dma_alloc_coherent(hostdata->dev, | |
467 | pool->size * sizeof(*pool->iu_storage), | |
468 | &pool->iu_token, 0); | |
469 | if (!pool->iu_storage) { | |
470 | kfree(pool->events); | |
471 | return -ENOMEM; | |
472 | } | |
473 | ||
474 | for (i = 0; i < pool->size; ++i) { | |
475 | struct srp_event_struct *evt = &pool->events[i]; | |
476 | memset(&evt->crq, 0x00, sizeof(evt->crq)); | |
477 | atomic_set(&evt->free, 1); | |
55c9b1e5 | 478 | evt->crq.valid = VIOSRP_CRQ_CMD_RSP; |
72264eb6 AB |
479 | evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu)); |
480 | evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token + | |
481 | sizeof(*evt->xfer_iu) * i); | |
1da177e4 LT |
482 | evt->xfer_iu = pool->iu_storage + i; |
483 | evt->hostdata = hostdata; | |
4dddbc26 JB |
484 | evt->ext_list = NULL; |
485 | evt->ext_list_token = 0; | |
1da177e4 LT |
486 | } |
487 | ||
488 | return 0; | |
489 | } | |
490 | ||
491 | /** | |
492 | * release_event_pool: - Frees memory of an event pool of a host | |
493 | * @pool: event_pool to be released | |
494 | * @hostdata: ibmvscsi_host_data who owns the even pool | |
495 | * | |
496 | * Returns zero on success. | |
497 | */ | |
498 | static void release_event_pool(struct event_pool *pool, | |
499 | struct ibmvscsi_host_data *hostdata) | |
500 | { | |
501 | int i, in_use = 0; | |
4dddbc26 | 502 | for (i = 0; i < pool->size; ++i) { |
1da177e4 LT |
503 | if (atomic_read(&pool->events[i].free) != 1) |
504 | ++in_use; | |
4dddbc26 JB |
505 | if (pool->events[i].ext_list) { |
506 | dma_free_coherent(hostdata->dev, | |
ef265673 | 507 | SG_ALL * sizeof(struct srp_direct_buf), |
4dddbc26 JB |
508 | pool->events[i].ext_list, |
509 | pool->events[i].ext_list_token); | |
510 | } | |
511 | } | |
1da177e4 | 512 | if (in_use) |
6c0a60ec BK |
513 | dev_warn(hostdata->dev, "releasing event pool with %d " |
514 | "events still in use?\n", in_use); | |
1da177e4 LT |
515 | kfree(pool->events); |
516 | dma_free_coherent(hostdata->dev, | |
517 | pool->size * sizeof(*pool->iu_storage), | |
518 | pool->iu_storage, pool->iu_token); | |
519 | } | |
520 | ||
521 | /** | |
522 | * valid_event_struct: - Determines if event is valid. | |
523 | * @pool: event_pool that contains the event | |
524 | * @evt: srp_event_struct to be checked for validity | |
525 | * | |
526 | * Returns zero if event is invalid, one otherwise. | |
527 | */ | |
528 | static int valid_event_struct(struct event_pool *pool, | |
529 | struct srp_event_struct *evt) | |
530 | { | |
531 | int index = evt - pool->events; | |
532 | if (index < 0 || index >= pool->size) /* outside of bounds */ | |
533 | return 0; | |
534 | if (evt != pool->events + index) /* unaligned */ | |
535 | return 0; | |
536 | return 1; | |
537 | } | |
538 | ||
539 | /** | |
540 | * ibmvscsi_free-event_struct: - Changes status of event to "free" | |
541 | * @pool: event_pool that contains the event | |
542 | * @evt: srp_event_struct to be modified | |
543 | * | |
544 | */ | |
545 | static void free_event_struct(struct event_pool *pool, | |
546 | struct srp_event_struct *evt) | |
547 | { | |
548 | if (!valid_event_struct(pool, evt)) { | |
6c0a60ec BK |
549 | dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p " |
550 | "(not in pool %p)\n", evt, pool->events); | |
1da177e4 LT |
551 | return; |
552 | } | |
553 | if (atomic_inc_return(&evt->free) != 1) { | |
6c0a60ec BK |
554 | dev_err(evt->hostdata->dev, "Freeing event_struct %p " |
555 | "which is not in use!\n", evt); | |
1da177e4 LT |
556 | return; |
557 | } | |
558 | } | |
559 | ||
560 | /** | |
561 | * get_evt_struct: - Gets the next free event in pool | |
562 | * @pool: event_pool that contains the events to be searched | |
563 | * | |
564 | * Returns the next event in "free" state, and NULL if none are free. | |
565 | * Note that no synchronization is done here, we assume the host_lock | |
566 | * will syncrhonze things. | |
567 | */ | |
568 | static struct srp_event_struct *get_event_struct(struct event_pool *pool) | |
569 | { | |
570 | int i; | |
571 | int poolsize = pool->size; | |
572 | int offset = pool->next; | |
573 | ||
574 | for (i = 0; i < poolsize; i++) { | |
575 | offset = (offset + 1) % poolsize; | |
576 | if (!atomic_dec_if_positive(&pool->events[offset].free)) { | |
577 | pool->next = offset; | |
578 | return &pool->events[offset]; | |
579 | } | |
580 | } | |
581 | ||
582 | printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); | |
583 | return NULL; | |
584 | } | |
585 | ||
586 | /** | |
587 | * init_event_struct: Initialize fields in an event struct that are always | |
588 | * required. | |
589 | * @evt: The event | |
590 | * @done: Routine to call when the event is responded to | |
591 | * @format: SRP or MAD format | |
592 | * @timeout: timeout value set in the CRQ | |
593 | */ | |
594 | static void init_event_struct(struct srp_event_struct *evt_struct, | |
595 | void (*done) (struct srp_event_struct *), | |
596 | u8 format, | |
597 | int timeout) | |
598 | { | |
599 | evt_struct->cmnd = NULL; | |
600 | evt_struct->cmnd_done = NULL; | |
601 | evt_struct->sync_srp = NULL; | |
602 | evt_struct->crq.format = format; | |
72264eb6 | 603 | evt_struct->crq.timeout = cpu_to_be16(timeout); |
1da177e4 LT |
604 | evt_struct->done = done; |
605 | } | |
606 | ||
607 | /* ------------------------------------------------------------ | |
608 | * Routines for receiving SCSI responses from the hosting partition | |
609 | */ | |
610 | ||
611 | /** | |
612 | * set_srp_direction: Set the fields in the srp related to data | |
613 | * direction and number of buffers based on the direction in | |
614 | * the scsi_cmnd and the number of buffers | |
615 | */ | |
616 | static void set_srp_direction(struct scsi_cmnd *cmd, | |
617 | struct srp_cmd *srp_cmd, | |
618 | int numbuf) | |
619 | { | |
ef265673 FT |
620 | u8 fmt; |
621 | ||
1da177e4 LT |
622 | if (numbuf == 0) |
623 | return; | |
624 | ||
ef265673 FT |
625 | if (numbuf == 1) |
626 | fmt = SRP_DATA_DESC_DIRECT; | |
627 | else { | |
628 | fmt = SRP_DATA_DESC_INDIRECT; | |
629 | numbuf = min(numbuf, MAX_INDIRECT_BUFS); | |
630 | ||
1da177e4 | 631 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
ef265673 FT |
632 | srp_cmd->data_out_desc_cnt = numbuf; |
633 | else | |
634 | srp_cmd->data_in_desc_cnt = numbuf; | |
1da177e4 | 635 | } |
ef265673 FT |
636 | |
637 | if (cmd->sc_data_direction == DMA_TO_DEVICE) | |
638 | srp_cmd->buf_fmt = fmt << 4; | |
639 | else | |
640 | srp_cmd->buf_fmt = fmt; | |
1da177e4 LT |
641 | } |
642 | ||
643 | /** | |
644 | * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format | |
645 | * @cmd: srp_cmd whose additional_data member will be unmapped | |
646 | * @dev: device for which the memory is mapped | |
647 | * | |
648 | */ | |
4dddbc26 JB |
649 | static void unmap_cmd_data(struct srp_cmd *cmd, |
650 | struct srp_event_struct *evt_struct, | |
651 | struct device *dev) | |
1da177e4 | 652 | { |
ef265673 FT |
653 | u8 out_fmt, in_fmt; |
654 | ||
655 | out_fmt = cmd->buf_fmt >> 4; | |
656 | in_fmt = cmd->buf_fmt & ((1U << 4) - 1); | |
657 | ||
658 | if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) | |
1da177e4 | 659 | return; |
4dddbc26 | 660 | |
a71fa1fc FT |
661 | if (evt_struct->cmnd) |
662 | scsi_dma_unmap(evt_struct->cmnd); | |
1da177e4 LT |
663 | } |
664 | ||
9413d7b8 | 665 | static int map_sg_list(struct scsi_cmnd *cmd, int nseg, |
ef265673 | 666 | struct srp_direct_buf *md) |
4dddbc26 JB |
667 | { |
668 | int i; | |
9413d7b8 | 669 | struct scatterlist *sg; |
4dddbc26 JB |
670 | u64 total_length = 0; |
671 | ||
9413d7b8 | 672 | scsi_for_each_sg(cmd, sg, nseg, i) { |
ef265673 | 673 | struct srp_direct_buf *descr = md + i; |
72264eb6 AB |
674 | descr->va = cpu_to_be64(sg_dma_address(sg)); |
675 | descr->len = cpu_to_be32(sg_dma_len(sg)); | |
ef265673 | 676 | descr->key = 0; |
9413d7b8 | 677 | total_length += sg_dma_len(sg); |
4dddbc26 JB |
678 | } |
679 | return total_length; | |
680 | } | |
681 | ||
1da177e4 LT |
682 | /** |
683 | * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields | |
684 | * @cmd: Scsi_Cmnd with the scatterlist | |
685 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
686 | * @dev: device for which to map dma memory | |
687 | * | |
688 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. | |
689 | * Returns 1 on success. | |
690 | */ | |
691 | static int map_sg_data(struct scsi_cmnd *cmd, | |
4dddbc26 | 692 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
693 | struct srp_cmd *srp_cmd, struct device *dev) |
694 | { | |
695 | ||
4dddbc26 | 696 | int sg_mapped; |
1da177e4 | 697 | u64 total_length = 0; |
ef265673 FT |
698 | struct srp_direct_buf *data = |
699 | (struct srp_direct_buf *) srp_cmd->add_data; | |
700 | struct srp_indirect_buf *indirect = | |
701 | (struct srp_indirect_buf *) data; | |
1da177e4 | 702 | |
9413d7b8 FT |
703 | sg_mapped = scsi_dma_map(cmd); |
704 | if (!sg_mapped) | |
705 | return 1; | |
706 | else if (sg_mapped < 0) | |
1da177e4 LT |
707 | return 0; |
708 | ||
709 | set_srp_direction(cmd, srp_cmd, sg_mapped); | |
710 | ||
711 | /* special case; we can use a single direct descriptor */ | |
712 | if (sg_mapped == 1) { | |
9413d7b8 | 713 | map_sg_list(cmd, sg_mapped, data); |
1da177e4 LT |
714 | return 1; |
715 | } | |
716 | ||
ef265673 | 717 | indirect->table_desc.va = 0; |
72264eb6 AB |
718 | indirect->table_desc.len = cpu_to_be32(sg_mapped * |
719 | sizeof(struct srp_direct_buf)); | |
ef265673 | 720 | indirect->table_desc.key = 0; |
4dddbc26 JB |
721 | |
722 | if (sg_mapped <= MAX_INDIRECT_BUFS) { | |
9413d7b8 | 723 | total_length = map_sg_list(cmd, sg_mapped, |
ef265673 | 724 | &indirect->desc_list[0]); |
72264eb6 | 725 | indirect->len = cpu_to_be32(total_length); |
4dddbc26 | 726 | return 1; |
1da177e4 | 727 | } |
1da177e4 | 728 | |
4dddbc26 JB |
729 | /* get indirect table */ |
730 | if (!evt_struct->ext_list) { | |
ef265673 | 731 | evt_struct->ext_list = (struct srp_direct_buf *) |
9413d7b8 | 732 | dma_alloc_coherent(dev, |
ef265673 FT |
733 | SG_ALL * sizeof(struct srp_direct_buf), |
734 | &evt_struct->ext_list_token, 0); | |
4dddbc26 | 735 | if (!evt_struct->ext_list) { |
7912a0ac RJ |
736 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
737 | sdev_printk(KERN_ERR, cmd->device, | |
738 | "Can't allocate memory " | |
739 | "for indirect table\n"); | |
e637d553 | 740 | scsi_dma_unmap(cmd); |
4dddbc26 | 741 | return 0; |
4dddbc26 JB |
742 | } |
743 | } | |
744 | ||
9413d7b8 | 745 | total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list); |
4dddbc26 | 746 | |
72264eb6 AB |
747 | indirect->len = cpu_to_be32(total_length); |
748 | indirect->table_desc.va = cpu_to_be64(evt_struct->ext_list_token); | |
749 | indirect->table_desc.len = cpu_to_be32(sg_mapped * | |
750 | sizeof(indirect->desc_list[0])); | |
ef265673 FT |
751 | memcpy(indirect->desc_list, evt_struct->ext_list, |
752 | MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); | |
4dddbc26 | 753 | return 1; |
1da177e4 LT |
754 | } |
755 | ||
1da177e4 LT |
756 | /** |
757 | * map_data_for_srp_cmd: - Calls functions to map data for srp cmds | |
758 | * @cmd: struct scsi_cmnd with the memory to be mapped | |
759 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
760 | * @dev: dma device for which to map dma memory | |
761 | * | |
762 | * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds | |
763 | * Returns 1 on success. | |
764 | */ | |
765 | static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, | |
4dddbc26 | 766 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
767 | struct srp_cmd *srp_cmd, struct device *dev) |
768 | { | |
769 | switch (cmd->sc_data_direction) { | |
770 | case DMA_FROM_DEVICE: | |
771 | case DMA_TO_DEVICE: | |
772 | break; | |
773 | case DMA_NONE: | |
774 | return 1; | |
775 | case DMA_BIDIRECTIONAL: | |
6c0a60ec BK |
776 | sdev_printk(KERN_ERR, cmd->device, |
777 | "Can't map DMA_BIDIRECTIONAL to read/write\n"); | |
1da177e4 LT |
778 | return 0; |
779 | default: | |
6c0a60ec BK |
780 | sdev_printk(KERN_ERR, cmd->device, |
781 | "Unknown data direction 0x%02x; can't map!\n", | |
782 | cmd->sc_data_direction); | |
1da177e4 LT |
783 | return 0; |
784 | } | |
785 | ||
9413d7b8 | 786 | return map_sg_data(cmd, evt_struct, srp_cmd, dev); |
1da177e4 LT |
787 | } |
788 | ||
3d0e91f7 BK |
789 | /** |
790 | * purge_requests: Our virtual adapter just shut down. purge any sent requests | |
791 | * @hostdata: the adapter | |
792 | */ | |
793 | static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) | |
794 | { | |
1117ef8a | 795 | struct srp_event_struct *evt; |
3d0e91f7 BK |
796 | unsigned long flags; |
797 | ||
798 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1117ef8a BK |
799 | while (!list_empty(&hostdata->sent)) { |
800 | evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list); | |
801 | list_del(&evt->list); | |
802 | del_timer(&evt->timer); | |
803 | ||
804 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
805 | if (evt->cmnd) { | |
806 | evt->cmnd->result = (error_code << 16); | |
807 | unmap_cmd_data(&evt->iu.srp.cmd, evt, | |
808 | evt->hostdata->dev); | |
809 | if (evt->cmnd_done) | |
810 | evt->cmnd_done(evt->cmnd); | |
9ee75597 BK |
811 | } else if (evt->done && evt->crq.format != VIOSRP_MAD_FORMAT && |
812 | evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ) | |
1117ef8a BK |
813 | evt->done(evt); |
814 | free_event_struct(&evt->hostdata->pool, evt); | |
815 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
3d0e91f7 BK |
816 | } |
817 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
818 | } | |
819 | ||
820 | /** | |
821 | * ibmvscsi_reset_host - Reset the connection to the server | |
822 | * @hostdata: struct ibmvscsi_host_data to reset | |
823 | */ | |
824 | static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata) | |
825 | { | |
826 | scsi_block_requests(hostdata->host); | |
827 | atomic_set(&hostdata->request_limit, 0); | |
828 | ||
829 | purge_requests(hostdata, DID_ERROR); | |
0f33ece5 BK |
830 | hostdata->reset_crq = 1; |
831 | wake_up(&hostdata->work_wait_q); | |
3d0e91f7 BK |
832 | } |
833 | ||
834 | /** | |
835 | * ibmvscsi_timeout - Internal command timeout handler | |
836 | * @evt_struct: struct srp_event_struct that timed out | |
837 | * | |
838 | * Called when an internally generated command times out | |
839 | */ | |
840 | static void ibmvscsi_timeout(struct srp_event_struct *evt_struct) | |
841 | { | |
842 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
843 | ||
844 | dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n", | |
845 | evt_struct->iu.srp.cmd.opcode); | |
846 | ||
847 | ibmvscsi_reset_host(hostdata); | |
848 | } | |
849 | ||
850 | ||
1da177e4 LT |
851 | /* ------------------------------------------------------------ |
852 | * Routines for sending and receiving SRPs | |
853 | */ | |
854 | /** | |
855 | * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() | |
856 | * @evt_struct: evt_struct to be sent | |
857 | * @hostdata: ibmvscsi_host_data of host | |
3d0e91f7 | 858 | * @timeout: timeout in seconds - 0 means do not time command |
1da177e4 LT |
859 | * |
860 | * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) | |
861 | * Note that this routine assumes that host_lock is held for synchronization | |
862 | */ | |
863 | static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, | |
3d0e91f7 BK |
864 | struct ibmvscsi_host_data *hostdata, |
865 | unsigned long timeout) | |
1da177e4 | 866 | { |
72264eb6 | 867 | __be64 *crq_as_u64 = (__be64 *)&evt_struct->crq; |
3c887e8a | 868 | int request_status = 0; |
1da177e4 | 869 | int rc; |
f3a9c4d7 | 870 | int srp_req = 0; |
1da177e4 | 871 | |
a897ff2a RJ |
872 | /* If we have exhausted our request limit, just fail this request, |
873 | * unless it is for a reset or abort. | |
1da177e4 LT |
874 | * Note that there are rare cases involving driver generated requests |
875 | * (such as task management requests) that the mid layer may think we | |
876 | * can handle more requests (can_queue) when we actually can't | |
877 | */ | |
cefbda2d | 878 | if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) { |
f3a9c4d7 | 879 | srp_req = 1; |
cefbda2d DB |
880 | request_status = |
881 | atomic_dec_if_positive(&hostdata->request_limit); | |
882 | /* If request limit was -1 when we started, it is now even | |
883 | * less than that | |
884 | */ | |
885 | if (request_status < -1) | |
886 | goto send_error; | |
a897ff2a | 887 | /* Otherwise, we may have run out of requests. */ |
3c887e8a RJ |
888 | /* If request limit was 0 when we started the adapter is in the |
889 | * process of performing a login with the server adapter, or | |
890 | * we may have run out of requests. | |
891 | */ | |
892 | else if (request_status == -1 && | |
893 | evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ) | |
894 | goto send_busy; | |
a897ff2a RJ |
895 | /* Abort and reset calls should make it through. |
896 | * Nothing except abort and reset should use the last two | |
897 | * slots unless we had two or less to begin with. | |
898 | */ | |
899 | else if (request_status < 2 && | |
900 | evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) { | |
901 | /* In the case that we have less than two requests | |
902 | * available, check the server limit as a combination | |
903 | * of the request limit and the number of requests | |
904 | * in-flight (the size of the send list). If the | |
905 | * server limit is greater than 2, return busy so | |
906 | * that the last two are reserved for reset and abort. | |
907 | */ | |
908 | int server_limit = request_status; | |
909 | struct srp_event_struct *tmp_evt; | |
910 | ||
911 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
912 | server_limit++; | |
913 | } | |
914 | ||
915 | if (server_limit > 2) | |
916 | goto send_busy; | |
917 | } | |
cefbda2d | 918 | } |
1da177e4 LT |
919 | |
920 | /* Copy the IU into the transfer area */ | |
921 | *evt_struct->xfer_iu = evt_struct->iu; | |
ef265673 | 922 | evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; |
1da177e4 LT |
923 | |
924 | /* Add this to the sent list. We need to do this | |
925 | * before we actually send | |
926 | * in case it comes back REALLY fast | |
927 | */ | |
928 | list_add_tail(&evt_struct->list, &hostdata->sent); | |
929 | ||
3d0e91f7 BK |
930 | init_timer(&evt_struct->timer); |
931 | if (timeout) { | |
932 | evt_struct->timer.data = (unsigned long) evt_struct; | |
933 | evt_struct->timer.expires = jiffies + (timeout * HZ); | |
934 | evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout; | |
935 | add_timer(&evt_struct->timer); | |
936 | } | |
937 | ||
72264eb6 AB |
938 | rc = ibmvscsi_send_crq(hostdata, be64_to_cpu(crq_as_u64[0]), |
939 | be64_to_cpu(crq_as_u64[1])); | |
940 | if (rc != 0) { | |
1da177e4 | 941 | list_del(&evt_struct->list); |
3d0e91f7 | 942 | del_timer(&evt_struct->timer); |
1da177e4 | 943 | |
860784c8 RJ |
944 | /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. |
945 | * Firmware will send a CRQ with a transport event (0xFF) to | |
946 | * tell this client what has happened to the transport. This | |
947 | * will be handled in ibmvscsi_handle_crq() | |
948 | */ | |
949 | if (rc == H_CLOSED) { | |
950 | dev_warn(hostdata->dev, "send warning. " | |
951 | "Receive queue closed, will retry.\n"); | |
952 | goto send_busy; | |
953 | } | |
6c0a60ec | 954 | dev_err(hostdata->dev, "send error %d\n", rc); |
f3a9c4d7 BK |
955 | if (srp_req) |
956 | atomic_inc(&hostdata->request_limit); | |
1da177e4 LT |
957 | goto send_error; |
958 | } | |
959 | ||
960 | return 0; | |
961 | ||
cefbda2d | 962 | send_busy: |
4dddbc26 | 963 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
1da177e4 | 964 | |
1da177e4 | 965 | free_event_struct(&hostdata->pool, evt_struct); |
f3a9c4d7 | 966 | if (srp_req && request_status != -1) |
3c887e8a | 967 | atomic_inc(&hostdata->request_limit); |
a897ff2a | 968 | return SCSI_MLQUEUE_HOST_BUSY; |
cefbda2d DB |
969 | |
970 | send_error: | |
971 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); | |
972 | ||
973 | if (evt_struct->cmnd != NULL) { | |
974 | evt_struct->cmnd->result = DID_ERROR << 16; | |
975 | evt_struct->cmnd_done(evt_struct->cmnd); | |
976 | } else if (evt_struct->done) | |
977 | evt_struct->done(evt_struct); | |
978 | ||
979 | free_event_struct(&hostdata->pool, evt_struct); | |
980 | return 0; | |
1da177e4 LT |
981 | } |
982 | ||
983 | /** | |
984 | * handle_cmd_rsp: - Handle responses from commands | |
985 | * @evt_struct: srp_event_struct to be handled | |
986 | * | |
987 | * Used as a callback by when sending scsi cmds. | |
988 | * Gets called by ibmvscsi_handle_crq() | |
989 | */ | |
990 | static void handle_cmd_rsp(struct srp_event_struct *evt_struct) | |
991 | { | |
992 | struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; | |
993 | struct scsi_cmnd *cmnd = evt_struct->cmnd; | |
994 | ||
ef265673 | 995 | if (unlikely(rsp->opcode != SRP_RSP)) { |
1da177e4 | 996 | if (printk_ratelimit()) |
6c0a60ec | 997 | dev_warn(evt_struct->hostdata->dev, |
15c92746 | 998 | "bad SRP RSP type %#02x\n", rsp->opcode); |
1da177e4 LT |
999 | } |
1000 | ||
1001 | if (cmnd) { | |
c3a3b55a | 1002 | cmnd->result |= rsp->status; |
1da177e4 LT |
1003 | if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) |
1004 | memcpy(cmnd->sense_buffer, | |
ef265673 | 1005 | rsp->data, |
72264eb6 | 1006 | be32_to_cpu(rsp->sense_data_len)); |
1da177e4 | 1007 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
4dddbc26 | 1008 | evt_struct, |
1da177e4 LT |
1009 | evt_struct->hostdata->dev); |
1010 | ||
ef265673 | 1011 | if (rsp->flags & SRP_RSP_FLAG_DOOVER) |
72264eb6 AB |
1012 | scsi_set_resid(cmnd, |
1013 | be32_to_cpu(rsp->data_out_res_cnt)); | |
ef265673 | 1014 | else if (rsp->flags & SRP_RSP_FLAG_DIOVER) |
72264eb6 | 1015 | scsi_set_resid(cmnd, be32_to_cpu(rsp->data_in_res_cnt)); |
1da177e4 LT |
1016 | } |
1017 | ||
1018 | if (evt_struct->cmnd_done) | |
1019 | evt_struct->cmnd_done(cmnd); | |
1020 | } | |
1021 | ||
1022 | /** | |
1023 | * lun_from_dev: - Returns the lun of the scsi device | |
1024 | * @dev: struct scsi_device | |
1025 | * | |
1026 | */ | |
1027 | static inline u16 lun_from_dev(struct scsi_device *dev) | |
1028 | { | |
1029 | return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; | |
1030 | } | |
1031 | ||
1032 | /** | |
1033 | * ibmvscsi_queue: - The queuecommand function of the scsi template | |
1034 | * @cmd: struct scsi_cmnd to be executed | |
1035 | * @done: Callback function to be called when cmd is completed | |
1036 | */ | |
f281233d | 1037 | static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd, |
1da177e4 LT |
1038 | void (*done) (struct scsi_cmnd *)) |
1039 | { | |
1040 | struct srp_cmd *srp_cmd; | |
1041 | struct srp_event_struct *evt_struct; | |
ef265673 | 1042 | struct srp_indirect_buf *indirect; |
7603e02e | 1043 | struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host); |
1da177e4 | 1044 | u16 lun = lun_from_dev(cmnd->device); |
ef265673 | 1045 | u8 out_fmt, in_fmt; |
1da177e4 | 1046 | |
c3a3b55a | 1047 | cmnd->result = (DID_OK << 16); |
1da177e4 LT |
1048 | evt_struct = get_event_struct(&hostdata->pool); |
1049 | if (!evt_struct) | |
1050 | return SCSI_MLQUEUE_HOST_BUSY; | |
1051 | ||
1da177e4 LT |
1052 | /* Set up the actual SRP IU */ |
1053 | srp_cmd = &evt_struct->iu.srp.cmd; | |
ef265673 FT |
1054 | memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); |
1055 | srp_cmd->opcode = SRP_CMD; | |
64a87b24 | 1056 | memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb)); |
985aa495 | 1057 | int_to_scsilun(lun, &srp_cmd->lun); |
1da177e4 | 1058 | |
4dddbc26 | 1059 | if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { |
7912a0ac RJ |
1060 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
1061 | sdev_printk(KERN_ERR, cmnd->device, | |
1062 | "couldn't convert cmd to srp_cmd\n"); | |
1da177e4 LT |
1063 | free_event_struct(&hostdata->pool, evt_struct); |
1064 | return SCSI_MLQUEUE_HOST_BUSY; | |
1065 | } | |
1066 | ||
4dddbc26 JB |
1067 | init_event_struct(evt_struct, |
1068 | handle_cmd_rsp, | |
1069 | VIOSRP_SRP_FORMAT, | |
242f9dcb | 1070 | cmnd->request->timeout/HZ); |
4dddbc26 JB |
1071 | |
1072 | evt_struct->cmnd = cmnd; | |
1073 | evt_struct->cmnd_done = done; | |
1074 | ||
1da177e4 | 1075 | /* Fix up dma address of the buffer itself */ |
ef265673 FT |
1076 | indirect = (struct srp_indirect_buf *) srp_cmd->add_data; |
1077 | out_fmt = srp_cmd->buf_fmt >> 4; | |
1078 | in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); | |
1079 | if ((in_fmt == SRP_DATA_DESC_INDIRECT || | |
1080 | out_fmt == SRP_DATA_DESC_INDIRECT) && | |
1081 | indirect->table_desc.va == 0) { | |
72264eb6 AB |
1082 | indirect->table_desc.va = |
1083 | cpu_to_be64(be64_to_cpu(evt_struct->crq.IU_data_ptr) + | |
ef265673 | 1084 | offsetof(struct srp_cmd, add_data) + |
72264eb6 | 1085 | offsetof(struct srp_indirect_buf, desc_list)); |
1da177e4 LT |
1086 | } |
1087 | ||
3d0e91f7 | 1088 | return ibmvscsi_send_srp_event(evt_struct, hostdata, 0); |
1da177e4 LT |
1089 | } |
1090 | ||
f281233d JG |
1091 | static DEF_SCSI_QCMD(ibmvscsi_queuecommand) |
1092 | ||
1da177e4 LT |
1093 | /* ------------------------------------------------------------ |
1094 | * Routines for driver initialization | |
1095 | */ | |
3507e13f | 1096 | |
126c5cc3 BK |
1097 | /** |
1098 | * map_persist_bufs: - Pre-map persistent data for adapter logins | |
1099 | * @hostdata: ibmvscsi_host_data of host | |
1100 | * | |
1101 | * Map the capabilities and adapter info DMA buffers to avoid runtime failures. | |
1102 | * Return 1 on error, 0 on success. | |
1103 | */ | |
1104 | static int map_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
1105 | { | |
1106 | ||
1107 | hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps, | |
1108 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
1109 | ||
1110 | if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) { | |
1111 | dev_err(hostdata->dev, "Unable to map capabilities buffer!\n"); | |
1112 | return 1; | |
1113 | } | |
1114 | ||
1115 | hostdata->adapter_info_addr = dma_map_single(hostdata->dev, | |
1116 | &hostdata->madapter_info, | |
1117 | sizeof(hostdata->madapter_info), | |
1118 | DMA_BIDIRECTIONAL); | |
1119 | if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) { | |
1120 | dev_err(hostdata->dev, "Unable to map adapter info buffer!\n"); | |
1121 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
1122 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
1123 | return 1; | |
1124 | } | |
1125 | ||
1126 | return 0; | |
1127 | } | |
1128 | ||
1129 | /** | |
1130 | * unmap_persist_bufs: - Unmap persistent data needed for adapter logins | |
1131 | * @hostdata: ibmvscsi_host_data of host | |
1132 | * | |
1133 | * Unmap the capabilities and adapter info DMA buffers | |
1134 | */ | |
1135 | static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
1136 | { | |
1137 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
1138 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
1139 | ||
1140 | dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr, | |
1141 | sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL); | |
1142 | } | |
1143 | ||
3507e13f BK |
1144 | /** |
1145 | * login_rsp: - Handle response to SRP login request | |
1146 | * @evt_struct: srp_event_struct with the response | |
1147 | * | |
1148 | * Used as a "done" callback by when sending srp_login. Gets called | |
1149 | * by ibmvscsi_handle_crq() | |
1150 | */ | |
1151 | static void login_rsp(struct srp_event_struct *evt_struct) | |
1152 | { | |
1153 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1154 | switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { | |
1155 | case SRP_LOGIN_RSP: /* it worked! */ | |
1156 | break; | |
1157 | case SRP_LOGIN_REJ: /* refused! */ | |
1158 | dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n", | |
1159 | evt_struct->xfer_iu->srp.login_rej.reason); | |
1160 | /* Login failed. */ | |
1161 | atomic_set(&hostdata->request_limit, -1); | |
1162 | return; | |
1163 | default: | |
1164 | dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n", | |
1165 | evt_struct->xfer_iu->srp.login_rsp.opcode); | |
1166 | /* Login failed. */ | |
1167 | atomic_set(&hostdata->request_limit, -1); | |
1168 | return; | |
1169 | } | |
1170 | ||
1171 | dev_info(hostdata->dev, "SRP_LOGIN succeeded\n"); | |
126c5cc3 | 1172 | hostdata->client_migrated = 0; |
3507e13f BK |
1173 | |
1174 | /* Now we know what the real request-limit is. | |
1175 | * This value is set rather than added to request_limit because | |
1176 | * request_limit could have been set to -1 by this client. | |
1177 | */ | |
1178 | atomic_set(&hostdata->request_limit, | |
72264eb6 | 1179 | be32_to_cpu(evt_struct->xfer_iu->srp.login_rsp.req_lim_delta)); |
3507e13f BK |
1180 | |
1181 | /* If we had any pending I/Os, kick them */ | |
1182 | scsi_unblock_requests(hostdata->host); | |
1183 | } | |
1184 | ||
1185 | /** | |
1186 | * send_srp_login: - Sends the srp login | |
1187 | * @hostdata: ibmvscsi_host_data of host | |
1188 | * | |
1189 | * Returns zero if successful. | |
1190 | */ | |
1191 | static int send_srp_login(struct ibmvscsi_host_data *hostdata) | |
1192 | { | |
1193 | int rc; | |
1194 | unsigned long flags; | |
1195 | struct srp_login_req *login; | |
1196 | struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); | |
1197 | ||
1198 | BUG_ON(!evt_struct); | |
1199 | init_event_struct(evt_struct, login_rsp, | |
1200 | VIOSRP_SRP_FORMAT, login_timeout); | |
1201 | ||
1202 | login = &evt_struct->iu.srp.login_req; | |
1203 | memset(login, 0, sizeof(*login)); | |
1204 | login->opcode = SRP_LOGIN_REQ; | |
72264eb6 AB |
1205 | login->req_it_iu_len = cpu_to_be32(sizeof(union srp_iu)); |
1206 | login->req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | | |
1207 | SRP_BUF_FORMAT_INDIRECT); | |
3507e13f BK |
1208 | |
1209 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1210 | /* Start out with a request limit of 0, since this is negotiated in | |
1211 | * the login request we are just sending and login requests always | |
1212 | * get sent by the driver regardless of request_limit. | |
1213 | */ | |
1214 | atomic_set(&hostdata->request_limit, 0); | |
1215 | ||
1216 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2); | |
1217 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1218 | dev_info(hostdata->dev, "sent SRP login\n"); | |
1219 | return rc; | |
1220 | }; | |
1221 | ||
126c5cc3 BK |
1222 | /** |
1223 | * capabilities_rsp: - Handle response to MAD adapter capabilities request | |
1224 | * @evt_struct: srp_event_struct with the response | |
1225 | * | |
1226 | * Used as a "done" callback by when sending adapter_info. | |
1227 | */ | |
1228 | static void capabilities_rsp(struct srp_event_struct *evt_struct) | |
1229 | { | |
1230 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1231 | ||
1232 | if (evt_struct->xfer_iu->mad.capabilities.common.status) { | |
1233 | dev_err(hostdata->dev, "error 0x%X getting capabilities info\n", | |
1234 | evt_struct->xfer_iu->mad.capabilities.common.status); | |
1235 | } else { | |
72264eb6 AB |
1236 | if (hostdata->caps.migration.common.server_support != |
1237 | cpu_to_be16(SERVER_SUPPORTS_CAP)) | |
126c5cc3 BK |
1238 | dev_info(hostdata->dev, "Partition migration not supported\n"); |
1239 | ||
1240 | if (client_reserve) { | |
1241 | if (hostdata->caps.reserve.common.server_support == | |
72264eb6 | 1242 | cpu_to_be16(SERVER_SUPPORTS_CAP)) |
126c5cc3 BK |
1243 | dev_info(hostdata->dev, "Client reserve enabled\n"); |
1244 | else | |
1245 | dev_info(hostdata->dev, "Client reserve not supported\n"); | |
1246 | } | |
1247 | } | |
1248 | ||
1249 | send_srp_login(hostdata); | |
1250 | } | |
1251 | ||
1252 | /** | |
1253 | * send_mad_capabilities: - Sends the mad capabilities request | |
1254 | * and stores the result so it can be retrieved with | |
1255 | * @hostdata: ibmvscsi_host_data of host | |
1256 | */ | |
1257 | static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata) | |
1258 | { | |
1259 | struct viosrp_capabilities *req; | |
1260 | struct srp_event_struct *evt_struct; | |
1261 | unsigned long flags; | |
61c7a080 | 1262 | struct device_node *of_node = hostdata->dev->of_node; |
126c5cc3 BK |
1263 | const char *location; |
1264 | ||
1265 | evt_struct = get_event_struct(&hostdata->pool); | |
1266 | BUG_ON(!evt_struct); | |
1267 | ||
1268 | init_event_struct(evt_struct, capabilities_rsp, | |
1269 | VIOSRP_MAD_FORMAT, info_timeout); | |
1270 | ||
1271 | req = &evt_struct->iu.mad.capabilities; | |
1272 | memset(req, 0, sizeof(*req)); | |
1273 | ||
72264eb6 | 1274 | hostdata->caps.flags = cpu_to_be32(CAP_LIST_SUPPORTED); |
126c5cc3 | 1275 | if (hostdata->client_migrated) |
72264eb6 | 1276 | hostdata->caps.flags |= cpu_to_be32(CLIENT_MIGRATED); |
126c5cc3 BK |
1277 | |
1278 | strncpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev), | |
1279 | sizeof(hostdata->caps.name)); | |
1280 | hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0'; | |
1281 | ||
1282 | location = of_get_property(of_node, "ibm,loc-code", NULL); | |
1283 | location = location ? location : dev_name(hostdata->dev); | |
1284 | strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc)); | |
1285 | hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0'; | |
1286 | ||
72264eb6 AB |
1287 | req->common.type = cpu_to_be32(VIOSRP_CAPABILITIES_TYPE); |
1288 | req->buffer = cpu_to_be64(hostdata->caps_addr); | |
126c5cc3 | 1289 | |
72264eb6 AB |
1290 | hostdata->caps.migration.common.cap_type = |
1291 | cpu_to_be32(MIGRATION_CAPABILITIES); | |
1292 | hostdata->caps.migration.common.length = | |
1293 | cpu_to_be16(sizeof(hostdata->caps.migration)); | |
1294 | hostdata->caps.migration.common.server_support = | |
1295 | cpu_to_be16(SERVER_SUPPORTS_CAP); | |
1296 | hostdata->caps.migration.ecl = cpu_to_be32(1); | |
126c5cc3 BK |
1297 | |
1298 | if (client_reserve) { | |
72264eb6 AB |
1299 | hostdata->caps.reserve.common.cap_type = |
1300 | cpu_to_be32(RESERVATION_CAPABILITIES); | |
1301 | hostdata->caps.reserve.common.length = | |
1302 | cpu_to_be16(sizeof(hostdata->caps.reserve)); | |
1303 | hostdata->caps.reserve.common.server_support = | |
1304 | cpu_to_be16(SERVER_SUPPORTS_CAP); | |
1305 | hostdata->caps.reserve.type = | |
1306 | cpu_to_be32(CLIENT_RESERVE_SCSI_2); | |
1307 | req->common.length = | |
1308 | cpu_to_be16(sizeof(hostdata->caps)); | |
126c5cc3 | 1309 | } else |
72264eb6 AB |
1310 | req->common.length = cpu_to_be16(sizeof(hostdata->caps) - |
1311 | sizeof(hostdata->caps.reserve)); | |
126c5cc3 BK |
1312 | |
1313 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1314 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) | |
1315 | dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n"); | |
1316 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1317 | }; | |
1318 | ||
c1988e31 RJ |
1319 | /** |
1320 | * fast_fail_rsp: - Handle response to MAD enable fast fail | |
1321 | * @evt_struct: srp_event_struct with the response | |
1322 | * | |
1323 | * Used as a "done" callback by when sending enable fast fail. Gets called | |
1324 | * by ibmvscsi_handle_crq() | |
1325 | */ | |
1326 | static void fast_fail_rsp(struct srp_event_struct *evt_struct) | |
1327 | { | |
1328 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
72264eb6 | 1329 | u16 status = be16_to_cpu(evt_struct->xfer_iu->mad.fast_fail.common.status); |
c1988e31 RJ |
1330 | |
1331 | if (status == VIOSRP_MAD_NOT_SUPPORTED) | |
1332 | dev_err(hostdata->dev, "fast_fail not supported in server\n"); | |
1333 | else if (status == VIOSRP_MAD_FAILED) | |
1334 | dev_err(hostdata->dev, "fast_fail request failed\n"); | |
1335 | else if (status != VIOSRP_MAD_SUCCESS) | |
1336 | dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status); | |
1337 | ||
126c5cc3 | 1338 | send_mad_capabilities(hostdata); |
c1988e31 RJ |
1339 | } |
1340 | ||
1341 | /** | |
1342 | * init_host - Start host initialization | |
1343 | * @hostdata: ibmvscsi_host_data of host | |
1344 | * | |
1345 | * Returns zero if successful. | |
1346 | */ | |
1347 | static int enable_fast_fail(struct ibmvscsi_host_data *hostdata) | |
1348 | { | |
1349 | int rc; | |
1350 | unsigned long flags; | |
1351 | struct viosrp_fast_fail *fast_fail_mad; | |
1352 | struct srp_event_struct *evt_struct; | |
1353 | ||
126c5cc3 BK |
1354 | if (!fast_fail) { |
1355 | send_mad_capabilities(hostdata); | |
1356 | return 0; | |
1357 | } | |
c1988e31 RJ |
1358 | |
1359 | evt_struct = get_event_struct(&hostdata->pool); | |
1360 | BUG_ON(!evt_struct); | |
1361 | ||
1362 | init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout); | |
1363 | ||
1364 | fast_fail_mad = &evt_struct->iu.mad.fast_fail; | |
1365 | memset(fast_fail_mad, 0, sizeof(*fast_fail_mad)); | |
72264eb6 AB |
1366 | fast_fail_mad->common.type = cpu_to_be32(VIOSRP_ENABLE_FAST_FAIL); |
1367 | fast_fail_mad->common.length = cpu_to_be16(sizeof(*fast_fail_mad)); | |
c1988e31 RJ |
1368 | |
1369 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1370 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); | |
1371 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1372 | return rc; | |
1373 | } | |
1374 | ||
1da177e4 LT |
1375 | /** |
1376 | * adapter_info_rsp: - Handle response to MAD adapter info request | |
1377 | * @evt_struct: srp_event_struct with the response | |
1378 | * | |
1379 | * Used as a "done" callback by when sending adapter_info. Gets called | |
1380 | * by ibmvscsi_handle_crq() | |
1381 | */ | |
1382 | static void adapter_info_rsp(struct srp_event_struct *evt_struct) | |
1383 | { | |
1384 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1da177e4 LT |
1385 | |
1386 | if (evt_struct->xfer_iu->mad.adapter_info.common.status) { | |
6c0a60ec BK |
1387 | dev_err(hostdata->dev, "error %d getting adapter info\n", |
1388 | evt_struct->xfer_iu->mad.adapter_info.common.status); | |
1da177e4 | 1389 | } else { |
6c0a60ec BK |
1390 | dev_info(hostdata->dev, "host srp version: %s, " |
1391 | "host partition %s (%d), OS %d, max io %u\n", | |
1392 | hostdata->madapter_info.srp_version, | |
1393 | hostdata->madapter_info.partition_name, | |
72264eb6 AB |
1394 | be32_to_cpu(hostdata->madapter_info.partition_number), |
1395 | be32_to_cpu(hostdata->madapter_info.os_type), | |
1396 | be32_to_cpu(hostdata->madapter_info.port_max_txu[0])); | |
1da177e4 LT |
1397 | |
1398 | if (hostdata->madapter_info.port_max_txu[0]) | |
1399 | hostdata->host->max_sectors = | |
72264eb6 | 1400 | be32_to_cpu(hostdata->madapter_info.port_max_txu[0]) >> 9; |
154fb614 | 1401 | |
45d8c30f | 1402 | if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX && |
154fb614 | 1403 | strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { |
6c0a60ec BK |
1404 | dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n", |
1405 | hostdata->madapter_info.srp_version); | |
1406 | dev_err(hostdata->dev, "limiting scatterlists to %d\n", | |
1407 | MAX_INDIRECT_BUFS); | |
154fb614 DB |
1408 | hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; |
1409 | } | |
e08afeb7 | 1410 | |
45d8c30f | 1411 | if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX) { |
e08afeb7 BK |
1412 | enable_fast_fail(hostdata); |
1413 | return; | |
1414 | } | |
1da177e4 | 1415 | } |
3507e13f | 1416 | |
e08afeb7 | 1417 | send_srp_login(hostdata); |
1da177e4 LT |
1418 | } |
1419 | ||
1420 | /** | |
1421 | * send_mad_adapter_info: - Sends the mad adapter info request | |
1422 | * and stores the result so it can be retrieved with | |
1423 | * sysfs. We COULD consider causing a failure if the | |
1424 | * returned SRP version doesn't match ours. | |
1425 | * @hostdata: ibmvscsi_host_data of host | |
1426 | * | |
1427 | * Returns zero if successful. | |
1428 | */ | |
1429 | static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) | |
1430 | { | |
1431 | struct viosrp_adapter_info *req; | |
1432 | struct srp_event_struct *evt_struct; | |
06f923cb | 1433 | unsigned long flags; |
e5dbfa66 | 1434 | |
1da177e4 | 1435 | evt_struct = get_event_struct(&hostdata->pool); |
3507e13f | 1436 | BUG_ON(!evt_struct); |
1da177e4 LT |
1437 | |
1438 | init_event_struct(evt_struct, | |
1439 | adapter_info_rsp, | |
1440 | VIOSRP_MAD_FORMAT, | |
e1a5ce5b | 1441 | info_timeout); |
1da177e4 LT |
1442 | |
1443 | req = &evt_struct->iu.mad.adapter_info; | |
1444 | memset(req, 0x00, sizeof(*req)); | |
1445 | ||
72264eb6 AB |
1446 | req->common.type = cpu_to_be32(VIOSRP_ADAPTER_INFO_TYPE); |
1447 | req->common.length = cpu_to_be16(sizeof(hostdata->madapter_info)); | |
1448 | req->buffer = cpu_to_be64(hostdata->adapter_info_addr); | |
1da177e4 | 1449 | |
06f923cb | 1450 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
126c5cc3 | 1451 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) |
6c0a60ec | 1452 | dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n"); |
06f923cb | 1453 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1454 | }; |
1455 | ||
1456 | /** | |
3507e13f | 1457 | * init_adapter: Start virtual adapter initialization sequence |
1da177e4 | 1458 | * |
3507e13f BK |
1459 | */ |
1460 | static void init_adapter(struct ibmvscsi_host_data *hostdata) | |
1da177e4 | 1461 | { |
1da177e4 | 1462 | send_mad_adapter_info(hostdata); |
1da177e4 LT |
1463 | } |
1464 | ||
1da177e4 LT |
1465 | /** |
1466 | * sync_completion: Signal that a synchronous command has completed | |
1467 | * Note that after returning from this call, the evt_struct is freed. | |
1468 | * the caller waiting on this completion shouldn't touch the evt_struct | |
1469 | * again. | |
1470 | */ | |
1471 | static void sync_completion(struct srp_event_struct *evt_struct) | |
1472 | { | |
1473 | /* copy the response back */ | |
1474 | if (evt_struct->sync_srp) | |
1475 | *evt_struct->sync_srp = *evt_struct->xfer_iu; | |
1476 | ||
1477 | complete(&evt_struct->comp); | |
1478 | } | |
1479 | ||
1480 | /** | |
1481 | * ibmvscsi_abort: Abort a command...from scsi host template | |
1482 | * send this over to the server and wait synchronously for the response | |
1483 | */ | |
1484 | static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) | |
1485 | { | |
7603e02e | 1486 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1487 | struct srp_tsk_mgmt *tsk_mgmt; |
1488 | struct srp_event_struct *evt; | |
1489 | struct srp_event_struct *tmp_evt, *found_evt; | |
1490 | union viosrp_iu srp_rsp; | |
1491 | int rsp_rc; | |
be042f24 | 1492 | unsigned long flags; |
1da177e4 | 1493 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1494 | unsigned long wait_switch = 0; |
1da177e4 LT |
1495 | |
1496 | /* First, find this command in our sent list so we can figure | |
1497 | * out the correct tag | |
1498 | */ | |
be042f24 | 1499 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1500 | wait_switch = jiffies + (init_timeout * HZ); |
1501 | do { | |
1502 | found_evt = NULL; | |
1503 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1504 | if (tmp_evt->cmnd == cmd) { | |
1505 | found_evt = tmp_evt; | |
1506 | break; | |
1507 | } | |
1da177e4 | 1508 | } |
1da177e4 | 1509 | |
860784c8 RJ |
1510 | if (!found_evt) { |
1511 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1512 | return SUCCESS; | |
1513 | } | |
1da177e4 | 1514 | |
860784c8 RJ |
1515 | evt = get_event_struct(&hostdata->pool); |
1516 | if (evt == NULL) { | |
1517 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1518 | sdev_printk(KERN_ERR, cmd->device, | |
1519 | "failed to allocate abort event\n"); | |
1520 | return FAILED; | |
1521 | } | |
1da177e4 | 1522 | |
860784c8 RJ |
1523 | init_event_struct(evt, |
1524 | sync_completion, | |
1525 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1526 | abort_timeout); |
1da177e4 | 1527 | |
860784c8 | 1528 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1529 | |
860784c8 RJ |
1530 | /* Set up an abort SRP command */ |
1531 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1532 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
985aa495 | 1533 | int_to_scsilun(lun, &tsk_mgmt->lun); |
860784c8 RJ |
1534 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; |
1535 | tsk_mgmt->task_tag = (u64) found_evt; | |
1536 | ||
1537 | evt->sync_srp = &srp_rsp; | |
1538 | ||
1539 | init_completion(&evt->comp); | |
e1a5ce5b | 1540 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2); |
860784c8 RJ |
1541 | |
1542 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1543 | break; | |
1544 | ||
1545 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1546 | msleep(10); | |
1547 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1548 | } while (time_before(jiffies, wait_switch)); | |
1549 | ||
be042f24 | 1550 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1551 | |
be042f24 | 1552 | if (rsp_rc != 0) { |
6c0a60ec BK |
1553 | sdev_printk(KERN_ERR, cmd->device, |
1554 | "failed to send abort() event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1555 | return FAILED; |
1556 | } | |
1557 | ||
860784c8 | 1558 | sdev_printk(KERN_INFO, cmd->device, |
fe333321 | 1559 | "aborting command. lun 0x%llx, tag 0x%llx\n", |
860784c8 RJ |
1560 | (((u64) lun) << 48), (u64) found_evt); |
1561 | ||
1da177e4 | 1562 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1563 | |
1564 | /* make sure we got a good response */ | |
ef265673 | 1565 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1566 | if (printk_ratelimit()) |
6c0a60ec BK |
1567 | sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n", |
1568 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1569 | return FAILED; |
1570 | } | |
1571 | ||
ef265673 FT |
1572 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1573 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1574 | else |
1575 | rsp_rc = srp_rsp.srp.rsp.status; | |
1576 | ||
1577 | if (rsp_rc) { | |
1578 | if (printk_ratelimit()) | |
6c0a60ec | 1579 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1580 | "abort code %d for task tag 0x%llx\n", |
6c0a60ec | 1581 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1582 | return FAILED; |
1583 | } | |
1584 | ||
1585 | /* Because we dropped the spinlock above, it's possible | |
1586 | * The event is no longer in our list. Make sure it didn't | |
1587 | * complete while we were aborting | |
1588 | */ | |
be042f24 | 1589 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1590 | found_evt = NULL; |
1591 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1592 | if (tmp_evt->cmnd == cmd) { | |
1593 | found_evt = tmp_evt; | |
1594 | break; | |
1595 | } | |
1596 | } | |
1597 | ||
1598 | if (found_evt == NULL) { | |
be042f24 | 1599 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
fe333321 | 1600 | sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n", |
6c0a60ec | 1601 | tsk_mgmt->task_tag); |
1da177e4 LT |
1602 | return SUCCESS; |
1603 | } | |
1604 | ||
fe333321 | 1605 | sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n", |
6c0a60ec | 1606 | tsk_mgmt->task_tag); |
1da177e4 LT |
1607 | |
1608 | cmd->result = (DID_ABORT << 16); | |
1609 | list_del(&found_evt->list); | |
4dddbc26 JB |
1610 | unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, |
1611 | found_evt->hostdata->dev); | |
1da177e4 | 1612 | free_event_struct(&found_evt->hostdata->pool, found_evt); |
be042f24 | 1613 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1614 | atomic_inc(&hostdata->request_limit); |
1615 | return SUCCESS; | |
1616 | } | |
1617 | ||
1618 | /** | |
1619 | * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host | |
1620 | * template send this over to the server and wait synchronously for the | |
1621 | * response | |
1622 | */ | |
1623 | static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) | |
1624 | { | |
7603e02e | 1625 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1626 | struct srp_tsk_mgmt *tsk_mgmt; |
1627 | struct srp_event_struct *evt; | |
1628 | struct srp_event_struct *tmp_evt, *pos; | |
1629 | union viosrp_iu srp_rsp; | |
1630 | int rsp_rc; | |
be042f24 | 1631 | unsigned long flags; |
1da177e4 | 1632 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1633 | unsigned long wait_switch = 0; |
1da177e4 | 1634 | |
be042f24 | 1635 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1636 | wait_switch = jiffies + (init_timeout * HZ); |
1637 | do { | |
1638 | evt = get_event_struct(&hostdata->pool); | |
1639 | if (evt == NULL) { | |
1640 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1641 | sdev_printk(KERN_ERR, cmd->device, | |
1642 | "failed to allocate reset event\n"); | |
1643 | return FAILED; | |
1644 | } | |
1da177e4 | 1645 | |
860784c8 RJ |
1646 | init_event_struct(evt, |
1647 | sync_completion, | |
1648 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1649 | reset_timeout); |
1da177e4 | 1650 | |
860784c8 | 1651 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1652 | |
860784c8 RJ |
1653 | /* Set up a lun reset SRP command */ |
1654 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1655 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
985aa495 | 1656 | int_to_scsilun(lun, &tsk_mgmt->lun); |
860784c8 | 1657 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; |
1da177e4 | 1658 | |
860784c8 RJ |
1659 | evt->sync_srp = &srp_rsp; |
1660 | ||
1661 | init_completion(&evt->comp); | |
e1a5ce5b | 1662 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2); |
860784c8 RJ |
1663 | |
1664 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1665 | break; | |
1666 | ||
1667 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1668 | msleep(10); | |
1669 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1670 | } while (time_before(jiffies, wait_switch)); | |
1da177e4 | 1671 | |
be042f24 | 1672 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1673 | |
be042f24 | 1674 | if (rsp_rc != 0) { |
6c0a60ec BK |
1675 | sdev_printk(KERN_ERR, cmd->device, |
1676 | "failed to send reset event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1677 | return FAILED; |
1678 | } | |
1679 | ||
fe333321 | 1680 | sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n", |
860784c8 RJ |
1681 | (((u64) lun) << 48)); |
1682 | ||
1da177e4 | 1683 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1684 | |
1685 | /* make sure we got a good response */ | |
ef265673 | 1686 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1687 | if (printk_ratelimit()) |
6c0a60ec BK |
1688 | sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n", |
1689 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1690 | return FAILED; |
1691 | } | |
1692 | ||
ef265673 FT |
1693 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1694 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1695 | else |
1696 | rsp_rc = srp_rsp.srp.rsp.status; | |
1697 | ||
1698 | if (rsp_rc) { | |
1699 | if (printk_ratelimit()) | |
6c0a60ec | 1700 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1701 | "reset code %d for task tag 0x%llx\n", |
6c0a60ec | 1702 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1703 | return FAILED; |
1704 | } | |
1705 | ||
1706 | /* We need to find all commands for this LUN that have not yet been | |
1707 | * responded to, and fail them with DID_RESET | |
1708 | */ | |
be042f24 | 1709 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1710 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
1711 | if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { | |
1712 | if (tmp_evt->cmnd) | |
1713 | tmp_evt->cmnd->result = (DID_RESET << 16); | |
1714 | list_del(&tmp_evt->list); | |
4dddbc26 JB |
1715 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, |
1716 | tmp_evt->hostdata->dev); | |
1da177e4 LT |
1717 | free_event_struct(&tmp_evt->hostdata->pool, |
1718 | tmp_evt); | |
1719 | atomic_inc(&hostdata->request_limit); | |
1720 | if (tmp_evt->cmnd_done) | |
1721 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
1722 | else if (tmp_evt->done) | |
1723 | tmp_evt->done(tmp_evt); | |
1724 | } | |
1725 | } | |
be042f24 | 1726 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1727 | return SUCCESS; |
1728 | } | |
1729 | ||
1730 | /** | |
3d0e91f7 BK |
1731 | * ibmvscsi_eh_host_reset_handler - Reset the connection to the server |
1732 | * @cmd: struct scsi_cmnd having problems | |
1733 | */ | |
1734 | static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd) | |
1da177e4 | 1735 | { |
3d0e91f7 | 1736 | unsigned long wait_switch = 0; |
7603e02e | 1737 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 | 1738 | |
3d0e91f7 BK |
1739 | dev_err(hostdata->dev, "Resetting connection due to error recovery\n"); |
1740 | ||
1741 | ibmvscsi_reset_host(hostdata); | |
1742 | ||
1743 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1744 | time_before(jiffies, wait_switch) && | |
1745 | atomic_read(&hostdata->request_limit) < 2;) { | |
1746 | ||
1747 | msleep(10); | |
1da177e4 | 1748 | } |
3d0e91f7 BK |
1749 | |
1750 | if (atomic_read(&hostdata->request_limit) <= 0) | |
1751 | return FAILED; | |
1752 | ||
1753 | return SUCCESS; | |
1da177e4 LT |
1754 | } |
1755 | ||
1756 | /** | |
1757 | * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ | |
1758 | * @crq: Command/Response queue | |
1759 | * @hostdata: ibmvscsi_host_data of host | |
1760 | * | |
1761 | */ | |
9965c2f1 BH |
1762 | static void ibmvscsi_handle_crq(struct viosrp_crq *crq, |
1763 | struct ibmvscsi_host_data *hostdata) | |
1da177e4 | 1764 | { |
6c0a60ec | 1765 | long rc; |
1da177e4 | 1766 | unsigned long flags; |
72264eb6 | 1767 | /* The hypervisor copies our tag value here so no byteswapping */ |
1da177e4 | 1768 | struct srp_event_struct *evt_struct = |
72264eb6 | 1769 | (__force struct srp_event_struct *)crq->IU_data_ptr; |
1da177e4 | 1770 | switch (crq->valid) { |
55c9b1e5 | 1771 | case VIOSRP_CRQ_INIT_RSP: /* initialization */ |
1da177e4 | 1772 | switch (crq->format) { |
55c9b1e5 | 1773 | case VIOSRP_CRQ_INIT: /* Initialization message */ |
6c0a60ec | 1774 | dev_info(hostdata->dev, "partner initialized\n"); |
1da177e4 | 1775 | /* Send back a response */ |
9965c2f1 BH |
1776 | rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0); |
1777 | if (rc == 0) { | |
1da177e4 | 1778 | /* Now login */ |
3507e13f | 1779 | init_adapter(hostdata); |
1da177e4 | 1780 | } else { |
6c0a60ec | 1781 | dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc); |
1da177e4 LT |
1782 | } |
1783 | ||
1784 | break; | |
55c9b1e5 | 1785 | case VIOSRP_CRQ_INIT_COMPLETE: /* Initialization response */ |
6c0a60ec | 1786 | dev_info(hostdata->dev, "partner initialization complete\n"); |
1da177e4 LT |
1787 | |
1788 | /* Now login */ | |
3507e13f | 1789 | init_adapter(hostdata); |
1da177e4 LT |
1790 | break; |
1791 | default: | |
6c0a60ec | 1792 | dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format); |
1da177e4 LT |
1793 | } |
1794 | return; | |
55c9b1e5 | 1795 | case VIOSRP_CRQ_XPORT_EVENT: /* Hypervisor telling us the connection is closed */ |
2b541f8f | 1796 | scsi_block_requests(hostdata->host); |
cefbda2d | 1797 | atomic_set(&hostdata->request_limit, 0); |
2b541f8f DB |
1798 | if (crq->format == 0x06) { |
1799 | /* We need to re-setup the interpartition connection */ | |
6c0a60ec | 1800 | dev_info(hostdata->dev, "Re-enabling adapter!\n"); |
126c5cc3 | 1801 | hostdata->client_migrated = 1; |
0f33ece5 | 1802 | hostdata->reenable_crq = 1; |
2b541f8f | 1803 | purge_requests(hostdata, DID_REQUEUE); |
0f33ece5 | 1804 | wake_up(&hostdata->work_wait_q); |
2b541f8f | 1805 | } else { |
6c0a60ec BK |
1806 | dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n", |
1807 | crq->format); | |
0f33ece5 | 1808 | ibmvscsi_reset_host(hostdata); |
2b541f8f | 1809 | } |
1da177e4 | 1810 | return; |
55c9b1e5 | 1811 | case VIOSRP_CRQ_CMD_RSP: /* real payload */ |
1da177e4 LT |
1812 | break; |
1813 | default: | |
6c0a60ec BK |
1814 | dev_err(hostdata->dev, "got an invalid message type 0x%02x\n", |
1815 | crq->valid); | |
1da177e4 LT |
1816 | return; |
1817 | } | |
1818 | ||
1819 | /* The only kind of payload CRQs we should get are responses to | |
1820 | * things we send. Make sure this response is to something we | |
1821 | * actually sent | |
1822 | */ | |
1823 | if (!valid_event_struct(&hostdata->pool, evt_struct)) { | |
6c0a60ec | 1824 | dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n", |
72264eb6 | 1825 | evt_struct); |
1da177e4 LT |
1826 | return; |
1827 | } | |
1828 | ||
1829 | if (atomic_read(&evt_struct->free)) { | |
6c0a60ec | 1830 | dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n", |
72264eb6 | 1831 | evt_struct); |
1da177e4 LT |
1832 | return; |
1833 | } | |
1834 | ||
1835 | if (crq->format == VIOSRP_SRP_FORMAT) | |
72264eb6 | 1836 | atomic_add(be32_to_cpu(evt_struct->xfer_iu->srp.rsp.req_lim_delta), |
1da177e4 LT |
1837 | &hostdata->request_limit); |
1838 | ||
3d0e91f7 BK |
1839 | del_timer(&evt_struct->timer); |
1840 | ||
ca61668b | 1841 | if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd) |
c3a3b55a | 1842 | evt_struct->cmnd->result = DID_ERROR << 16; |
1da177e4 LT |
1843 | if (evt_struct->done) |
1844 | evt_struct->done(evt_struct); | |
1845 | else | |
6c0a60ec | 1846 | dev_err(hostdata->dev, "returned done() is NULL; not running it!\n"); |
1da177e4 LT |
1847 | |
1848 | /* | |
1849 | * Lock the host_lock before messing with these structures, since we | |
1850 | * are running in a task context | |
1851 | */ | |
1852 | spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); | |
1853 | list_del(&evt_struct->list); | |
1854 | free_event_struct(&evt_struct->hostdata->pool, evt_struct); | |
1855 | spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); | |
1856 | } | |
1857 | ||
0979c84b RJ |
1858 | /** |
1859 | * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk. | |
1860 | * @sdev: struct scsi_device device to configure | |
1861 | * | |
1862 | * Enable allow_restart for a device if it is a disk. Adjust the | |
1863 | * queue_depth here also as is required by the documentation for | |
1864 | * struct scsi_host_template. | |
1865 | */ | |
1866 | static int ibmvscsi_slave_configure(struct scsi_device *sdev) | |
1867 | { | |
1868 | struct Scsi_Host *shost = sdev->host; | |
1869 | unsigned long lock_flags = 0; | |
1870 | ||
1871 | spin_lock_irqsave(shost->host_lock, lock_flags); | |
d1a357fc | 1872 | if (sdev->type == TYPE_DISK) { |
0979c84b | 1873 | sdev->allow_restart = 1; |
e1a5ce5b | 1874 | blk_queue_rq_timeout(sdev->request_queue, 120 * HZ); |
d1a357fc | 1875 | } |
0979c84b RJ |
1876 | spin_unlock_irqrestore(shost->host_lock, lock_flags); |
1877 | return 0; | |
1878 | } | |
1879 | ||
742d25b8 BK |
1880 | /** |
1881 | * ibmvscsi_change_queue_depth - Change the device's queue depth | |
1882 | * @sdev: scsi device struct | |
1883 | * @qdepth: depth to set | |
e881a172 | 1884 | * @reason: calling context |
742d25b8 BK |
1885 | * |
1886 | * Return value: | |
1887 | * actual depth set | |
1888 | **/ | |
db5ed4df | 1889 | static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) |
742d25b8 BK |
1890 | { |
1891 | if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN) | |
1892 | qdepth = IBMVSCSI_MAX_CMDS_PER_LUN; | |
db5ed4df | 1893 | return scsi_change_queue_depth(sdev, qdepth); |
742d25b8 BK |
1894 | } |
1895 | ||
1da177e4 LT |
1896 | /* ------------------------------------------------------------ |
1897 | * sysfs attributes | |
1898 | */ | |
126c5cc3 BK |
1899 | static ssize_t show_host_vhost_loc(struct device *dev, |
1900 | struct device_attribute *attr, char *buf) | |
1901 | { | |
1902 | struct Scsi_Host *shost = class_to_shost(dev); | |
1903 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1904 | int len; | |
1905 | ||
1906 | len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n", | |
1907 | hostdata->caps.loc); | |
1908 | return len; | |
1909 | } | |
1910 | ||
1911 | static struct device_attribute ibmvscsi_host_vhost_loc = { | |
1912 | .attr = { | |
1913 | .name = "vhost_loc", | |
1914 | .mode = S_IRUGO, | |
1915 | }, | |
1916 | .show = show_host_vhost_loc, | |
1917 | }; | |
1918 | ||
1919 | static ssize_t show_host_vhost_name(struct device *dev, | |
1920 | struct device_attribute *attr, char *buf) | |
1921 | { | |
1922 | struct Scsi_Host *shost = class_to_shost(dev); | |
1923 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1924 | int len; | |
1925 | ||
1926 | len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n", | |
1927 | hostdata->caps.name); | |
1928 | return len; | |
1929 | } | |
1930 | ||
1931 | static struct device_attribute ibmvscsi_host_vhost_name = { | |
1932 | .attr = { | |
1933 | .name = "vhost_name", | |
1934 | .mode = S_IRUGO, | |
1935 | }, | |
1936 | .show = show_host_vhost_name, | |
1937 | }; | |
1938 | ||
ee959b00 TJ |
1939 | static ssize_t show_host_srp_version(struct device *dev, |
1940 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1941 | { |
ee959b00 | 1942 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1943 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1944 | int len; |
1945 | ||
1946 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1947 | hostdata->madapter_info.srp_version); | |
1948 | return len; | |
1949 | } | |
1950 | ||
ee959b00 | 1951 | static struct device_attribute ibmvscsi_host_srp_version = { |
1da177e4 LT |
1952 | .attr = { |
1953 | .name = "srp_version", | |
1954 | .mode = S_IRUGO, | |
1955 | }, | |
1956 | .show = show_host_srp_version, | |
1957 | }; | |
1958 | ||
ee959b00 TJ |
1959 | static ssize_t show_host_partition_name(struct device *dev, |
1960 | struct device_attribute *attr, | |
1da177e4 LT |
1961 | char *buf) |
1962 | { | |
ee959b00 | 1963 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1964 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1965 | int len; |
1966 | ||
1967 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1968 | hostdata->madapter_info.partition_name); | |
1969 | return len; | |
1970 | } | |
1971 | ||
ee959b00 | 1972 | static struct device_attribute ibmvscsi_host_partition_name = { |
1da177e4 LT |
1973 | .attr = { |
1974 | .name = "partition_name", | |
1975 | .mode = S_IRUGO, | |
1976 | }, | |
1977 | .show = show_host_partition_name, | |
1978 | }; | |
1979 | ||
ee959b00 TJ |
1980 | static ssize_t show_host_partition_number(struct device *dev, |
1981 | struct device_attribute *attr, | |
1da177e4 LT |
1982 | char *buf) |
1983 | { | |
ee959b00 | 1984 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1985 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1986 | int len; |
1987 | ||
1988 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
f36948cb | 1989 | be32_to_cpu(hostdata->madapter_info.partition_number)); |
1da177e4 LT |
1990 | return len; |
1991 | } | |
1992 | ||
ee959b00 | 1993 | static struct device_attribute ibmvscsi_host_partition_number = { |
1da177e4 LT |
1994 | .attr = { |
1995 | .name = "partition_number", | |
1996 | .mode = S_IRUGO, | |
1997 | }, | |
1998 | .show = show_host_partition_number, | |
1999 | }; | |
2000 | ||
ee959b00 TJ |
2001 | static ssize_t show_host_mad_version(struct device *dev, |
2002 | struct device_attribute *attr, char *buf) | |
1da177e4 | 2003 | { |
ee959b00 | 2004 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 2005 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
2006 | int len; |
2007 | ||
2008 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
f36948cb | 2009 | be32_to_cpu(hostdata->madapter_info.mad_version)); |
1da177e4 LT |
2010 | return len; |
2011 | } | |
2012 | ||
ee959b00 | 2013 | static struct device_attribute ibmvscsi_host_mad_version = { |
1da177e4 LT |
2014 | .attr = { |
2015 | .name = "mad_version", | |
2016 | .mode = S_IRUGO, | |
2017 | }, | |
2018 | .show = show_host_mad_version, | |
2019 | }; | |
2020 | ||
ee959b00 TJ |
2021 | static ssize_t show_host_os_type(struct device *dev, |
2022 | struct device_attribute *attr, char *buf) | |
1da177e4 | 2023 | { |
ee959b00 | 2024 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 2025 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
2026 | int len; |
2027 | ||
f36948cb TD |
2028 | len = snprintf(buf, PAGE_SIZE, "%d\n", |
2029 | be32_to_cpu(hostdata->madapter_info.os_type)); | |
1da177e4 LT |
2030 | return len; |
2031 | } | |
2032 | ||
ee959b00 | 2033 | static struct device_attribute ibmvscsi_host_os_type = { |
1da177e4 LT |
2034 | .attr = { |
2035 | .name = "os_type", | |
2036 | .mode = S_IRUGO, | |
2037 | }, | |
2038 | .show = show_host_os_type, | |
2039 | }; | |
2040 | ||
ee959b00 TJ |
2041 | static ssize_t show_host_config(struct device *dev, |
2042 | struct device_attribute *attr, char *buf) | |
1da177e4 | 2043 | { |
0a1c0ebf | 2044 | return 0; |
1da177e4 LT |
2045 | } |
2046 | ||
ee959b00 | 2047 | static struct device_attribute ibmvscsi_host_config = { |
1da177e4 | 2048 | .attr = { |
0a1c0ebf TD |
2049 | .name = "config", |
2050 | .mode = S_IRUGO, | |
2051 | }, | |
1da177e4 LT |
2052 | .show = show_host_config, |
2053 | }; | |
2054 | ||
ee959b00 | 2055 | static struct device_attribute *ibmvscsi_attrs[] = { |
126c5cc3 BK |
2056 | &ibmvscsi_host_vhost_loc, |
2057 | &ibmvscsi_host_vhost_name, | |
1da177e4 LT |
2058 | &ibmvscsi_host_srp_version, |
2059 | &ibmvscsi_host_partition_name, | |
2060 | &ibmvscsi_host_partition_number, | |
2061 | &ibmvscsi_host_mad_version, | |
2062 | &ibmvscsi_host_os_type, | |
2063 | &ibmvscsi_host_config, | |
2064 | NULL | |
2065 | }; | |
2066 | ||
2067 | /* ------------------------------------------------------------ | |
2068 | * SCSI driver registration | |
2069 | */ | |
2070 | static struct scsi_host_template driver_template = { | |
2071 | .module = THIS_MODULE, | |
2072 | .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, | |
2073 | .proc_name = "ibmvscsi", | |
2074 | .queuecommand = ibmvscsi_queuecommand, | |
b6a05c82 | 2075 | .eh_timed_out = srp_timed_out, |
1da177e4 LT |
2076 | .eh_abort_handler = ibmvscsi_eh_abort_handler, |
2077 | .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, | |
3d0e91f7 | 2078 | .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler, |
0979c84b | 2079 | .slave_configure = ibmvscsi_slave_configure, |
742d25b8 | 2080 | .change_queue_depth = ibmvscsi_change_queue_depth, |
7912a0ac | 2081 | .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT, |
a897ff2a | 2082 | .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, |
1da177e4 | 2083 | .this_id = -1, |
4dddbc26 | 2084 | .sg_tablesize = SG_ALL, |
1da177e4 LT |
2085 | .use_clustering = ENABLE_CLUSTERING, |
2086 | .shost_attrs = ibmvscsi_attrs, | |
2087 | }; | |
2088 | ||
7912a0ac RJ |
2089 | /** |
2090 | * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver | |
2091 | * | |
2092 | * @vdev: struct vio_dev for the device whose desired IO mem is to be returned | |
2093 | * | |
2094 | * Return value: | |
2095 | * Number of bytes of IO data the driver will need to perform well. | |
2096 | */ | |
2097 | static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev) | |
2098 | { | |
2099 | /* iu_storage data allocated in initialize_event_pool */ | |
4f10aae0 | 2100 | unsigned long desired_io = max_events * sizeof(union viosrp_iu); |
7912a0ac RJ |
2101 | |
2102 | /* add io space for sg data */ | |
004dd5e8 | 2103 | desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 * |
7912a0ac RJ |
2104 | IBMVSCSI_CMDS_PER_LUN_DEFAULT); |
2105 | ||
2106 | return desired_io; | |
2107 | } | |
2108 | ||
0f33ece5 BK |
2109 | static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata) |
2110 | { | |
2111 | int rc; | |
2112 | char *action = "reset"; | |
2113 | ||
2114 | if (hostdata->reset_crq) { | |
2115 | smp_rmb(); | |
2116 | hostdata->reset_crq = 0; | |
2117 | ||
9965c2f1 | 2118 | rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata); |
0f33ece5 | 2119 | if (!rc) |
9965c2f1 | 2120 | rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); |
201aed67 | 2121 | vio_enable_interrupts(to_vio_dev(hostdata->dev)); |
0f33ece5 BK |
2122 | } else if (hostdata->reenable_crq) { |
2123 | smp_rmb(); | |
2124 | action = "enable"; | |
9965c2f1 | 2125 | rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata); |
0f33ece5 BK |
2126 | hostdata->reenable_crq = 0; |
2127 | if (!rc) | |
9965c2f1 | 2128 | rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); |
0f33ece5 BK |
2129 | } else |
2130 | return; | |
2131 | ||
2132 | if (rc) { | |
2133 | atomic_set(&hostdata->request_limit, -1); | |
2134 | dev_err(hostdata->dev, "error after %s\n", action); | |
2135 | } | |
2136 | ||
2137 | scsi_unblock_requests(hostdata->host); | |
2138 | } | |
2139 | ||
2140 | static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata) | |
2141 | { | |
2142 | if (kthread_should_stop()) | |
2143 | return 1; | |
2144 | else if (hostdata->reset_crq) { | |
2145 | smp_rmb(); | |
2146 | return 1; | |
2147 | } else if (hostdata->reenable_crq) { | |
2148 | smp_rmb(); | |
2149 | return 1; | |
2150 | } | |
2151 | ||
2152 | return 0; | |
2153 | } | |
2154 | ||
2155 | static int ibmvscsi_work(void *data) | |
2156 | { | |
2157 | struct ibmvscsi_host_data *hostdata = data; | |
2158 | int rc; | |
2159 | ||
8698a745 | 2160 | set_user_nice(current, MIN_NICE); |
0f33ece5 BK |
2161 | |
2162 | while (1) { | |
2163 | rc = wait_event_interruptible(hostdata->work_wait_q, | |
2164 | ibmvscsi_work_to_do(hostdata)); | |
2165 | ||
2166 | BUG_ON(rc); | |
2167 | ||
2168 | if (kthread_should_stop()) | |
2169 | break; | |
2170 | ||
2171 | ibmvscsi_do_work(hostdata); | |
2172 | } | |
2173 | ||
2174 | return 0; | |
2175 | } | |
2176 | ||
1da177e4 LT |
2177 | /** |
2178 | * Called by bus code for each adapter | |
2179 | */ | |
2180 | static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
2181 | { | |
2182 | struct ibmvscsi_host_data *hostdata; | |
2183 | struct Scsi_Host *host; | |
2184 | struct device *dev = &vdev->dev; | |
4d680419 FT |
2185 | struct srp_rport_identifiers ids; |
2186 | struct srp_rport *rport; | |
1da177e4 | 2187 | unsigned long wait_switch = 0; |
cefbda2d | 2188 | int rc; |
1da177e4 | 2189 | |
559fde70 | 2190 | dev_set_drvdata(&vdev->dev, NULL); |
1da177e4 LT |
2191 | |
2192 | host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); | |
2193 | if (!host) { | |
6c0a60ec | 2194 | dev_err(&vdev->dev, "couldn't allocate host data\n"); |
1da177e4 LT |
2195 | goto scsi_host_alloc_failed; |
2196 | } | |
2197 | ||
4d680419 | 2198 | host->transportt = ibmvscsi_transport_template; |
7603e02e | 2199 | hostdata = shost_priv(host); |
1da177e4 LT |
2200 | memset(hostdata, 0x00, sizeof(*hostdata)); |
2201 | INIT_LIST_HEAD(&hostdata->sent); | |
0f33ece5 | 2202 | init_waitqueue_head(&hostdata->work_wait_q); |
1da177e4 LT |
2203 | hostdata->host = host; |
2204 | hostdata->dev = dev; | |
2205 | atomic_set(&hostdata->request_limit, -1); | |
7912a0ac | 2206 | hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT; |
1da177e4 | 2207 | |
126c5cc3 BK |
2208 | if (map_persist_bufs(hostdata)) { |
2209 | dev_err(&vdev->dev, "couldn't map persistent buffers\n"); | |
2210 | goto persist_bufs_failed; | |
2211 | } | |
2212 | ||
0f33ece5 BK |
2213 | hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d", |
2214 | "ibmvscsi", host->host_no); | |
2215 | ||
2216 | if (IS_ERR(hostdata->work_thread)) { | |
2217 | dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n", | |
2218 | PTR_ERR(hostdata->work_thread)); | |
2219 | goto init_crq_failed; | |
2220 | } | |
2221 | ||
9965c2f1 | 2222 | rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events); |
cefbda2d | 2223 | if (rc != 0 && rc != H_RESOURCE) { |
6c0a60ec | 2224 | dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc); |
0f33ece5 | 2225 | goto kill_kthread; |
1da177e4 | 2226 | } |
4f10aae0 | 2227 | if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) { |
6c0a60ec | 2228 | dev_err(&vdev->dev, "couldn't initialize event pool\n"); |
1da177e4 LT |
2229 | goto init_pool_failed; |
2230 | } | |
2231 | ||
3467a146 | 2232 | host->max_lun = IBMVSCSI_MAX_LUN; |
1da177e4 LT |
2233 | host->max_id = max_id; |
2234 | host->max_channel = max_channel; | |
fbc56f08 | 2235 | host->max_cmd_len = 16; |
1da177e4 | 2236 | |
e3678a0c LV |
2237 | dev_info(dev, |
2238 | "Maximum ID: %d Maximum LUN: %llu Maximum Channel: %d\n", | |
2239 | host->max_id, host->max_lun, host->max_channel); | |
2240 | ||
1da177e4 LT |
2241 | if (scsi_add_host(hostdata->host, hostdata->dev)) |
2242 | goto add_host_failed; | |
2243 | ||
4d680419 FT |
2244 | /* we don't have a proper target_port_id so let's use the fake one */ |
2245 | memcpy(ids.port_id, hostdata->madapter_info.partition_name, | |
2246 | sizeof(ids.port_id)); | |
aebd5e47 | 2247 | ids.roles = SRP_RPORT_ROLE_TARGET; |
4d680419 FT |
2248 | rport = srp_rport_add(host, &ids); |
2249 | if (IS_ERR(rport)) | |
2250 | goto add_srp_port_failed; | |
2251 | ||
1da177e4 LT |
2252 | /* Try to send an initialization message. Note that this is allowed |
2253 | * to fail if the other end is not acive. In that case we don't | |
2254 | * want to scan | |
2255 | */ | |
9965c2f1 | 2256 | if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0 |
cefbda2d | 2257 | || rc == H_RESOURCE) { |
1da177e4 LT |
2258 | /* |
2259 | * Wait around max init_timeout secs for the adapter to finish | |
2260 | * initializing. When we are done initializing, we will have a | |
2261 | * valid request_limit. We don't want Linux scanning before | |
2262 | * we are ready. | |
2263 | */ | |
2264 | for (wait_switch = jiffies + (init_timeout * HZ); | |
2265 | time_before(jiffies, wait_switch) && | |
2266 | atomic_read(&hostdata->request_limit) < 2;) { | |
2267 | ||
2268 | msleep(10); | |
2269 | } | |
2270 | ||
2271 | /* if we now have a valid request_limit, initiate a scan */ | |
2272 | if (atomic_read(&hostdata->request_limit) > 0) | |
2273 | scsi_scan_host(host); | |
2274 | } | |
2275 | ||
559fde70 | 2276 | dev_set_drvdata(&vdev->dev, hostdata); |
32d6e4b6 | 2277 | list_add_tail(&hostdata->host_list, &ibmvscsi_head); |
1da177e4 LT |
2278 | return 0; |
2279 | ||
4d680419 FT |
2280 | add_srp_port_failed: |
2281 | scsi_remove_host(hostdata->host); | |
1da177e4 LT |
2282 | add_host_failed: |
2283 | release_event_pool(&hostdata->pool, hostdata); | |
2284 | init_pool_failed: | |
9965c2f1 | 2285 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events); |
0f33ece5 BK |
2286 | kill_kthread: |
2287 | kthread_stop(hostdata->work_thread); | |
1da177e4 | 2288 | init_crq_failed: |
126c5cc3 BK |
2289 | unmap_persist_bufs(hostdata); |
2290 | persist_bufs_failed: | |
1da177e4 LT |
2291 | scsi_host_put(host); |
2292 | scsi_host_alloc_failed: | |
2293 | return -1; | |
2294 | } | |
2295 | ||
2296 | static int ibmvscsi_remove(struct vio_dev *vdev) | |
2297 | { | |
559fde70 | 2298 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev); |
32d6e4b6 | 2299 | list_del(&hostdata->host_list); |
126c5cc3 | 2300 | unmap_persist_bufs(hostdata); |
1da177e4 | 2301 | release_event_pool(&hostdata->pool, hostdata); |
9965c2f1 | 2302 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, |
4f10aae0 | 2303 | max_events); |
4d680419 | 2304 | |
0f33ece5 | 2305 | kthread_stop(hostdata->work_thread); |
4d680419 | 2306 | srp_remove_host(hostdata->host); |
1da177e4 LT |
2307 | scsi_remove_host(hostdata->host); |
2308 | scsi_host_put(hostdata->host); | |
2309 | ||
2310 | return 0; | |
2311 | } | |
2312 | ||
64355b92 BK |
2313 | /** |
2314 | * ibmvscsi_resume: Resume from suspend | |
2315 | * @dev: device struct | |
2316 | * | |
2317 | * We may have lost an interrupt across suspend/resume, so kick the | |
2318 | * interrupt handler | |
2319 | */ | |
2320 | static int ibmvscsi_resume(struct device *dev) | |
2321 | { | |
2322 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev); | |
9965c2f1 BH |
2323 | vio_disable_interrupts(to_vio_dev(hostdata->dev)); |
2324 | tasklet_schedule(&hostdata->srp_task); | |
2325 | ||
2326 | return 0; | |
64355b92 BK |
2327 | } |
2328 | ||
1da177e4 LT |
2329 | /** |
2330 | * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we | |
2331 | * support. | |
2332 | */ | |
6f039790 | 2333 | static struct vio_device_id ibmvscsi_device_table[] = { |
1da177e4 | 2334 | {"vscsi", "IBM,v-scsi"}, |
fb120da6 | 2335 | { "", "" } |
1da177e4 | 2336 | }; |
1da177e4 | 2337 | MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
915124d8 | 2338 | |
64355b92 BK |
2339 | static struct dev_pm_ops ibmvscsi_pm_ops = { |
2340 | .resume = ibmvscsi_resume | |
2341 | }; | |
2342 | ||
1da177e4 | 2343 | static struct vio_driver ibmvscsi_driver = { |
1da177e4 LT |
2344 | .id_table = ibmvscsi_device_table, |
2345 | .probe = ibmvscsi_probe, | |
6fdf5392 | 2346 | .remove = ibmvscsi_remove, |
7912a0ac | 2347 | .get_desired_dma = ibmvscsi_get_desired_dma, |
cb52d897 BH |
2348 | .name = "ibmvscsi", |
2349 | .pm = &ibmvscsi_pm_ops, | |
1da177e4 LT |
2350 | }; |
2351 | ||
4d680419 FT |
2352 | static struct srp_function_template ibmvscsi_transport_functions = { |
2353 | }; | |
2354 | ||
1da177e4 LT |
2355 | int __init ibmvscsi_module_init(void) |
2356 | { | |
4d680419 FT |
2357 | int ret; |
2358 | ||
4f10aae0 BK |
2359 | /* Ensure we have two requests to do error recovery */ |
2360 | driver_template.can_queue = max_requests; | |
2361 | max_events = max_requests + 2; | |
2362 | ||
9965c2f1 | 2363 | if (!firmware_has_feature(FW_FEATURE_VIO)) |
d3849d51 DW |
2364 | return -ENODEV; |
2365 | ||
4d680419 FT |
2366 | ibmvscsi_transport_template = |
2367 | srp_attach_transport(&ibmvscsi_transport_functions); | |
2368 | if (!ibmvscsi_transport_template) | |
2369 | return -ENOMEM; | |
2370 | ||
2371 | ret = vio_register_driver(&ibmvscsi_driver); | |
2372 | if (ret) | |
2373 | srp_release_transport(ibmvscsi_transport_template); | |
2374 | return ret; | |
1da177e4 LT |
2375 | } |
2376 | ||
2377 | void __exit ibmvscsi_module_exit(void) | |
2378 | { | |
2379 | vio_unregister_driver(&ibmvscsi_driver); | |
4d680419 | 2380 | srp_release_transport(ibmvscsi_transport_template); |
1da177e4 LT |
2381 | } |
2382 | ||
2383 | module_init(ibmvscsi_module_init); | |
2384 | module_exit(ibmvscsi_module_exit); |