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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/ibmvscsi
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/scsi/ibmvscsi')
-rw-r--r--drivers/scsi/ibmvscsi/Makefile5
-rw-r--r--drivers/scsi/ibmvscsi/ibmvscsi.c1473
-rw-r--r--drivers/scsi/ibmvscsi/ibmvscsi.h109
-rw-r--r--drivers/scsi/ibmvscsi/iseries_vscsi.c144
-rw-r--r--drivers/scsi/ibmvscsi/rpa_vscsi.c260
-rw-r--r--drivers/scsi/ibmvscsi/srp.h225
-rw-r--r--drivers/scsi/ibmvscsi/viosrp.h126
7 files changed, 2342 insertions, 0 deletions
diff --git a/drivers/scsi/ibmvscsi/Makefile b/drivers/scsi/ibmvscsi/Makefile
new file mode 100644
index 000000000000..4e247b6b8700
--- /dev/null
+++ b/drivers/scsi/ibmvscsi/Makefile
@@ -0,0 +1,5 @@
1obj-$(CONFIG_SCSI_IBMVSCSI) += ibmvscsic.o
2
3ibmvscsic-y += ibmvscsi.o
4ibmvscsic-$(CONFIG_PPC_ISERIES) += iseries_vscsi.o
5ibmvscsic-$(CONFIG_PPC_PSERIES) += rpa_vscsi.o
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
new file mode 100644
index 000000000000..e89f76e5dd53
--- /dev/null
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -0,0 +1,1473 @@
1/* ------------------------------------------------------------
2 * ibmvscsi.c
3 * (C) Copyright IBM Corporation 1994, 2004
4 * Authors: Colin DeVilbiss (devilbis@us.ibm.com)
5 * Santiago Leon (santil@us.ibm.com)
6 * Dave Boutcher (sleddog@us.ibm.com)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21 * USA
22 *
23 * ------------------------------------------------------------
24 * Emulation of a SCSI host adapter for Virtual I/O devices
25 *
26 * This driver supports the SCSI adapter implemented by the IBM
27 * Power5 firmware. That SCSI adapter is not a physical adapter,
28 * but allows Linux SCSI peripheral drivers to directly
29 * access devices in another logical partition on the physical system.
30 *
31 * The virtual adapter(s) are present in the open firmware device
32 * tree just like real adapters.
33 *
34 * One of the capabilities provided on these systems is the ability
35 * to DMA between partitions. The architecture states that for VSCSI,
36 * the server side is allowed to DMA to and from the client. The client
37 * is never trusted to DMA to or from the server directly.
38 *
39 * Messages are sent between partitions on a "Command/Response Queue"
40 * (CRQ), which is just a buffer of 16 byte entries in the receiver's
41 * Senders cannot access the buffer directly, but send messages by
42 * making a hypervisor call and passing in the 16 bytes. The hypervisor
43 * puts the message in the next 16 byte space in round-robbin fashion,
44 * turns on the high order bit of the message (the valid bit), and
45 * generates an interrupt to the receiver (if interrupts are turned on.)
46 * The receiver just turns off the valid bit when they have copied out
47 * the message.
48 *
49 * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit
50 * (IU) (as defined in the T10 standard available at www.t10.org), gets
51 * a DMA address for the message, and sends it to the server as the
52 * payload of a CRQ message. The server DMAs the SRP IU and processes it,
53 * including doing any additional data transfers. When it is done, it
54 * DMAs the SRP response back to the same address as the request came from,
55 * and sends a CRQ message back to inform the client that the request has
56 * completed.
57 *
58 * Note that some of the underlying infrastructure is different between
59 * machines conforming to the "RS/6000 Platform Architecture" (RPA) and
60 * the older iSeries hypervisor models. To support both, some low level
61 * routines have been broken out into rpa_vscsi.c and iseries_vscsi.c.
62 * The Makefile should pick one, not two, not zero, of these.
63 *
64 * TODO: This is currently pretty tied to the IBM i/pSeries hypervisor
65 * interfaces. It would be really nice to abstract this above an RDMA
66 * layer.
67 */
68
69#include <linux/module.h>
70#include <linux/moduleparam.h>
71#include <linux/dma-mapping.h>
72#include <linux/delay.h>
73#include <asm/vio.h>
74#include <scsi/scsi.h>
75#include <scsi/scsi_cmnd.h>
76#include <scsi/scsi_host.h>
77#include <scsi/scsi_device.h>
78#include "ibmvscsi.h"
79
80/* The values below are somewhat arbitrary default values, but
81 * OS/400 will use 3 busses (disks, CDs, tapes, I think.)
82 * Note that there are 3 bits of channel value, 6 bits of id, and
83 * 5 bits of LUN.
84 */
85static int max_id = 64;
86static int max_channel = 3;
87static int init_timeout = 5;
88static int max_requests = 50;
89
90#define IBMVSCSI_VERSION "1.5.5"
91
92MODULE_DESCRIPTION("IBM Virtual SCSI");
93MODULE_AUTHOR("Dave Boutcher");
94MODULE_LICENSE("GPL");
95MODULE_VERSION(IBMVSCSI_VERSION);
96
97module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
98MODULE_PARM_DESC(max_id, "Largest ID value for each channel");
99module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
100MODULE_PARM_DESC(max_channel, "Largest channel value");
101module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
102MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
103module_param_named(max_requests, max_requests, int, S_IRUGO | S_IWUSR);
104MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
105
106/* ------------------------------------------------------------
107 * Routines for the event pool and event structs
108 */
109/**
110 * initialize_event_pool: - Allocates and initializes the event pool for a host
111 * @pool: event_pool to be initialized
112 * @size: Number of events in pool
113 * @hostdata: ibmvscsi_host_data who owns the event pool
114 *
115 * Returns zero on success.
116*/
117static int initialize_event_pool(struct event_pool *pool,
118 int size, struct ibmvscsi_host_data *hostdata)
119{
120 int i;
121
122 pool->size = size;
123 pool->next = 0;
124 pool->events = kmalloc(pool->size * sizeof(*pool->events), GFP_KERNEL);
125 if (!pool->events)
126 return -ENOMEM;
127 memset(pool->events, 0x00, pool->size * sizeof(*pool->events));
128
129 pool->iu_storage =
130 dma_alloc_coherent(hostdata->dev,
131 pool->size * sizeof(*pool->iu_storage),
132 &pool->iu_token, 0);
133 if (!pool->iu_storage) {
134 kfree(pool->events);
135 return -ENOMEM;
136 }
137
138 for (i = 0; i < pool->size; ++i) {
139 struct srp_event_struct *evt = &pool->events[i];
140 memset(&evt->crq, 0x00, sizeof(evt->crq));
141 atomic_set(&evt->free, 1);
142 evt->crq.valid = 0x80;
143 evt->crq.IU_length = sizeof(*evt->xfer_iu);
144 evt->crq.IU_data_ptr = pool->iu_token +
145 sizeof(*evt->xfer_iu) * i;
146 evt->xfer_iu = pool->iu_storage + i;
147 evt->hostdata = hostdata;
148 }
149
150 return 0;
151}
152
153/**
154 * release_event_pool: - Frees memory of an event pool of a host
155 * @pool: event_pool to be released
156 * @hostdata: ibmvscsi_host_data who owns the even pool
157 *
158 * Returns zero on success.
159*/
160static void release_event_pool(struct event_pool *pool,
161 struct ibmvscsi_host_data *hostdata)
162{
163 int i, in_use = 0;
164 for (i = 0; i < pool->size; ++i)
165 if (atomic_read(&pool->events[i].free) != 1)
166 ++in_use;
167 if (in_use)
168 printk(KERN_WARNING
169 "ibmvscsi: releasing event pool with %d "
170 "events still in use?\n", in_use);
171 kfree(pool->events);
172 dma_free_coherent(hostdata->dev,
173 pool->size * sizeof(*pool->iu_storage),
174 pool->iu_storage, pool->iu_token);
175}
176
177/**
178 * valid_event_struct: - Determines if event is valid.
179 * @pool: event_pool that contains the event
180 * @evt: srp_event_struct to be checked for validity
181 *
182 * Returns zero if event is invalid, one otherwise.
183*/
184static int valid_event_struct(struct event_pool *pool,
185 struct srp_event_struct *evt)
186{
187 int index = evt - pool->events;
188 if (index < 0 || index >= pool->size) /* outside of bounds */
189 return 0;
190 if (evt != pool->events + index) /* unaligned */
191 return 0;
192 return 1;
193}
194
195/**
196 * ibmvscsi_free-event_struct: - Changes status of event to "free"
197 * @pool: event_pool that contains the event
198 * @evt: srp_event_struct to be modified
199 *
200*/
201static void free_event_struct(struct event_pool *pool,
202 struct srp_event_struct *evt)
203{
204 if (!valid_event_struct(pool, evt)) {
205 printk(KERN_ERR
206 "ibmvscsi: Freeing invalid event_struct %p "
207 "(not in pool %p)\n", evt, pool->events);
208 return;
209 }
210 if (atomic_inc_return(&evt->free) != 1) {
211 printk(KERN_ERR
212 "ibmvscsi: Freeing event_struct %p "
213 "which is not in use!\n", evt);
214 return;
215 }
216}
217
218/**
219 * get_evt_struct: - Gets the next free event in pool
220 * @pool: event_pool that contains the events to be searched
221 *
222 * Returns the next event in "free" state, and NULL if none are free.
223 * Note that no synchronization is done here, we assume the host_lock
224 * will syncrhonze things.
225*/
226static struct srp_event_struct *get_event_struct(struct event_pool *pool)
227{
228 int i;
229 int poolsize = pool->size;
230 int offset = pool->next;
231
232 for (i = 0; i < poolsize; i++) {
233 offset = (offset + 1) % poolsize;
234 if (!atomic_dec_if_positive(&pool->events[offset].free)) {
235 pool->next = offset;
236 return &pool->events[offset];
237 }
238 }
239
240 printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
241 return NULL;
242}
243
244/**
245 * init_event_struct: Initialize fields in an event struct that are always
246 * required.
247 * @evt: The event
248 * @done: Routine to call when the event is responded to
249 * @format: SRP or MAD format
250 * @timeout: timeout value set in the CRQ
251 */
252static void init_event_struct(struct srp_event_struct *evt_struct,
253 void (*done) (struct srp_event_struct *),
254 u8 format,
255 int timeout)
256{
257 evt_struct->cmnd = NULL;
258 evt_struct->cmnd_done = NULL;
259 evt_struct->sync_srp = NULL;
260 evt_struct->crq.format = format;
261 evt_struct->crq.timeout = timeout;
262 evt_struct->done = done;
263}
264
265/* ------------------------------------------------------------
266 * Routines for receiving SCSI responses from the hosting partition
267 */
268
269/**
270 * set_srp_direction: Set the fields in the srp related to data
271 * direction and number of buffers based on the direction in
272 * the scsi_cmnd and the number of buffers
273 */
274static void set_srp_direction(struct scsi_cmnd *cmd,
275 struct srp_cmd *srp_cmd,
276 int numbuf)
277{
278 if (numbuf == 0)
279 return;
280
281 if (numbuf == 1) {
282 if (cmd->sc_data_direction == DMA_TO_DEVICE)
283 srp_cmd->data_out_format = SRP_DIRECT_BUFFER;
284 else
285 srp_cmd->data_in_format = SRP_DIRECT_BUFFER;
286 } else {
287 if (cmd->sc_data_direction == DMA_TO_DEVICE) {
288 srp_cmd->data_out_format = SRP_INDIRECT_BUFFER;
289 srp_cmd->data_out_count = numbuf;
290 } else {
291 srp_cmd->data_in_format = SRP_INDIRECT_BUFFER;
292 srp_cmd->data_in_count = numbuf;
293 }
294 }
295}
296
297/**
298 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
299 * @cmd: srp_cmd whose additional_data member will be unmapped
300 * @dev: device for which the memory is mapped
301 *
302*/
303static void unmap_cmd_data(struct srp_cmd *cmd, struct device *dev)
304{
305 int i;
306
307 if ((cmd->data_out_format == SRP_NO_BUFFER) &&
308 (cmd->data_in_format == SRP_NO_BUFFER))
309 return;
310 else if ((cmd->data_out_format == SRP_DIRECT_BUFFER) ||
311 (cmd->data_in_format == SRP_DIRECT_BUFFER)) {
312 struct memory_descriptor *data =
313 (struct memory_descriptor *)cmd->additional_data;
314 dma_unmap_single(dev, data->virtual_address, data->length,
315 DMA_BIDIRECTIONAL);
316 } else {
317 struct indirect_descriptor *indirect =
318 (struct indirect_descriptor *)cmd->additional_data;
319 int num_mapped = indirect->head.length /
320 sizeof(indirect->list[0]);
321 for (i = 0; i < num_mapped; ++i) {
322 struct memory_descriptor *data = &indirect->list[i];
323 dma_unmap_single(dev,
324 data->virtual_address,
325 data->length, DMA_BIDIRECTIONAL);
326 }
327 }
328}
329
330/**
331 * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
332 * @cmd: Scsi_Cmnd with the scatterlist
333 * @srp_cmd: srp_cmd that contains the memory descriptor
334 * @dev: device for which to map dma memory
335 *
336 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
337 * Returns 1 on success.
338*/
339static int map_sg_data(struct scsi_cmnd *cmd,
340 struct srp_cmd *srp_cmd, struct device *dev)
341{
342
343 int i, sg_mapped;
344 u64 total_length = 0;
345 struct scatterlist *sg = cmd->request_buffer;
346 struct memory_descriptor *data =
347 (struct memory_descriptor *)srp_cmd->additional_data;
348 struct indirect_descriptor *indirect =
349 (struct indirect_descriptor *)data;
350
351 sg_mapped = dma_map_sg(dev, sg, cmd->use_sg, DMA_BIDIRECTIONAL);
352
353 if (sg_mapped == 0)
354 return 0;
355
356 set_srp_direction(cmd, srp_cmd, sg_mapped);
357
358 /* special case; we can use a single direct descriptor */
359 if (sg_mapped == 1) {
360 data->virtual_address = sg_dma_address(&sg[0]);
361 data->length = sg_dma_len(&sg[0]);
362 data->memory_handle = 0;
363 return 1;
364 }
365
366 if (sg_mapped > MAX_INDIRECT_BUFS) {
367 printk(KERN_ERR
368 "ibmvscsi: More than %d mapped sg entries, got %d\n",
369 MAX_INDIRECT_BUFS, sg_mapped);
370 return 0;
371 }
372
373 indirect->head.virtual_address = 0;
374 indirect->head.length = sg_mapped * sizeof(indirect->list[0]);
375 indirect->head.memory_handle = 0;
376 for (i = 0; i < sg_mapped; ++i) {
377 struct memory_descriptor *descr = &indirect->list[i];
378 struct scatterlist *sg_entry = &sg[i];
379 descr->virtual_address = sg_dma_address(sg_entry);
380 descr->length = sg_dma_len(sg_entry);
381 descr->memory_handle = 0;
382 total_length += sg_dma_len(sg_entry);
383 }
384 indirect->total_length = total_length;
385
386 return 1;
387}
388
389/**
390 * map_single_data: - Maps memory and initializes memory decriptor fields
391 * @cmd: struct scsi_cmnd with the memory to be mapped
392 * @srp_cmd: srp_cmd that contains the memory descriptor
393 * @dev: device for which to map dma memory
394 *
395 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
396 * Returns 1 on success.
397*/
398static int map_single_data(struct scsi_cmnd *cmd,
399 struct srp_cmd *srp_cmd, struct device *dev)
400{
401 struct memory_descriptor *data =
402 (struct memory_descriptor *)srp_cmd->additional_data;
403
404 data->virtual_address =
405 dma_map_single(dev, cmd->request_buffer,
406 cmd->request_bufflen,
407 DMA_BIDIRECTIONAL);
408 if (dma_mapping_error(data->virtual_address)) {
409 printk(KERN_ERR
410 "ibmvscsi: Unable to map request_buffer for command!\n");
411 return 0;
412 }
413 data->length = cmd->request_bufflen;
414 data->memory_handle = 0;
415
416 set_srp_direction(cmd, srp_cmd, 1);
417
418 return 1;
419}
420
421/**
422 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
423 * @cmd: struct scsi_cmnd with the memory to be mapped
424 * @srp_cmd: srp_cmd that contains the memory descriptor
425 * @dev: dma device for which to map dma memory
426 *
427 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
428 * Returns 1 on success.
429*/
430static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
431 struct srp_cmd *srp_cmd, struct device *dev)
432{
433 switch (cmd->sc_data_direction) {
434 case DMA_FROM_DEVICE:
435 case DMA_TO_DEVICE:
436 break;
437 case DMA_NONE:
438 return 1;
439 case DMA_BIDIRECTIONAL:
440 printk(KERN_ERR
441 "ibmvscsi: Can't map DMA_BIDIRECTIONAL to read/write\n");
442 return 0;
443 default:
444 printk(KERN_ERR
445 "ibmvscsi: Unknown data direction 0x%02x; can't map!\n",
446 cmd->sc_data_direction);
447 return 0;
448 }
449
450 if (!cmd->request_buffer)
451 return 1;
452 if (cmd->use_sg)
453 return map_sg_data(cmd, srp_cmd, dev);
454 return map_single_data(cmd, srp_cmd, dev);
455}
456
457/* ------------------------------------------------------------
458 * Routines for sending and receiving SRPs
459 */
460/**
461 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
462 * @evt_struct: evt_struct to be sent
463 * @hostdata: ibmvscsi_host_data of host
464 *
465 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
466 * Note that this routine assumes that host_lock is held for synchronization
467*/
468static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
469 struct ibmvscsi_host_data *hostdata)
470{
471 struct scsi_cmnd *cmnd;
472 u64 *crq_as_u64 = (u64 *) &evt_struct->crq;
473 int rc;
474
475 /* If we have exhausted our request limit, just fail this request.
476 * Note that there are rare cases involving driver generated requests
477 * (such as task management requests) that the mid layer may think we
478 * can handle more requests (can_queue) when we actually can't
479 */
480 if ((evt_struct->crq.format == VIOSRP_SRP_FORMAT) &&
481 (atomic_dec_if_positive(&hostdata->request_limit) < 0)) {
482 /* See if the adapter is disabled */
483 if (atomic_read(&hostdata->request_limit) < 0)
484 goto send_error;
485
486 printk(KERN_WARNING
487 "ibmvscsi: Warning, request_limit exceeded\n");
488 unmap_cmd_data(&evt_struct->iu.srp.cmd,
489 hostdata->dev);
490 free_event_struct(&hostdata->pool, evt_struct);
491 return SCSI_MLQUEUE_HOST_BUSY;
492 }
493
494 /* Copy the IU into the transfer area */
495 *evt_struct->xfer_iu = evt_struct->iu;
496 evt_struct->xfer_iu->srp.generic.tag = (u64)evt_struct;
497
498 /* Add this to the sent list. We need to do this
499 * before we actually send
500 * in case it comes back REALLY fast
501 */
502 list_add_tail(&evt_struct->list, &hostdata->sent);
503
504 if ((rc =
505 ibmvscsi_send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) {
506 list_del(&evt_struct->list);
507
508 printk(KERN_ERR "ibmvscsi: failed to send event struct rc %d\n",
509 rc);
510 goto send_error;
511 }
512
513 return 0;
514
515 send_error:
516 unmap_cmd_data(&evt_struct->iu.srp.cmd, hostdata->dev);
517
518 if ((cmnd = evt_struct->cmnd) != NULL) {
519 cmnd->result = DID_ERROR << 16;
520 evt_struct->cmnd_done(cmnd);
521 } else if (evt_struct->done)
522 evt_struct->done(evt_struct);
523
524 free_event_struct(&hostdata->pool, evt_struct);
525 return 0;
526}
527
528/**
529 * handle_cmd_rsp: - Handle responses from commands
530 * @evt_struct: srp_event_struct to be handled
531 *
532 * Used as a callback by when sending scsi cmds.
533 * Gets called by ibmvscsi_handle_crq()
534*/
535static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
536{
537 struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
538 struct scsi_cmnd *cmnd = evt_struct->cmnd;
539
540 if (unlikely(rsp->type != SRP_RSP_TYPE)) {
541 if (printk_ratelimit())
542 printk(KERN_WARNING
543 "ibmvscsi: bad SRP RSP type %d\n",
544 rsp->type);
545 }
546
547 if (cmnd) {
548 cmnd->result = rsp->status;
549 if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
550 memcpy(cmnd->sense_buffer,
551 rsp->sense_and_response_data,
552 rsp->sense_data_list_length);
553 unmap_cmd_data(&evt_struct->iu.srp.cmd,
554 evt_struct->hostdata->dev);
555
556 if (rsp->doover)
557 cmnd->resid = rsp->data_out_residual_count;
558 else if (rsp->diover)
559 cmnd->resid = rsp->data_in_residual_count;
560 }
561
562 if (evt_struct->cmnd_done)
563 evt_struct->cmnd_done(cmnd);
564}
565
566/**
567 * lun_from_dev: - Returns the lun of the scsi device
568 * @dev: struct scsi_device
569 *
570*/
571static inline u16 lun_from_dev(struct scsi_device *dev)
572{
573 return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
574}
575
576/**
577 * ibmvscsi_queue: - The queuecommand function of the scsi template
578 * @cmd: struct scsi_cmnd to be executed
579 * @done: Callback function to be called when cmd is completed
580*/
581static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd,
582 void (*done) (struct scsi_cmnd *))
583{
584 struct srp_cmd *srp_cmd;
585 struct srp_event_struct *evt_struct;
586 struct ibmvscsi_host_data *hostdata =
587 (struct ibmvscsi_host_data *)&cmnd->device->host->hostdata;
588 u16 lun = lun_from_dev(cmnd->device);
589
590 evt_struct = get_event_struct(&hostdata->pool);
591 if (!evt_struct)
592 return SCSI_MLQUEUE_HOST_BUSY;
593
594 init_event_struct(evt_struct,
595 handle_cmd_rsp,
596 VIOSRP_SRP_FORMAT,
597 cmnd->timeout);
598
599 evt_struct->cmnd = cmnd;
600 evt_struct->cmnd_done = done;
601
602 /* Set up the actual SRP IU */
603 srp_cmd = &evt_struct->iu.srp.cmd;
604 memset(srp_cmd, 0x00, sizeof(*srp_cmd));
605 srp_cmd->type = SRP_CMD_TYPE;
606 memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(cmnd->cmnd));
607 srp_cmd->lun = ((u64) lun) << 48;
608
609 if (!map_data_for_srp_cmd(cmnd, srp_cmd, hostdata->dev)) {
610 printk(KERN_ERR "ibmvscsi: couldn't convert cmd to srp_cmd\n");
611 free_event_struct(&hostdata->pool, evt_struct);
612 return SCSI_MLQUEUE_HOST_BUSY;
613 }
614
615 /* Fix up dma address of the buffer itself */
616 if ((srp_cmd->data_out_format == SRP_INDIRECT_BUFFER) ||
617 (srp_cmd->data_in_format == SRP_INDIRECT_BUFFER)) {
618 struct indirect_descriptor *indirect =
619 (struct indirect_descriptor *)srp_cmd->additional_data;
620 indirect->head.virtual_address = evt_struct->crq.IU_data_ptr +
621 offsetof(struct srp_cmd, additional_data) +
622 offsetof(struct indirect_descriptor, list);
623 }
624
625 return ibmvscsi_send_srp_event(evt_struct, hostdata);
626}
627
628/* ------------------------------------------------------------
629 * Routines for driver initialization
630 */
631/**
632 * adapter_info_rsp: - Handle response to MAD adapter info request
633 * @evt_struct: srp_event_struct with the response
634 *
635 * Used as a "done" callback by when sending adapter_info. Gets called
636 * by ibmvscsi_handle_crq()
637*/
638static void adapter_info_rsp(struct srp_event_struct *evt_struct)
639{
640 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
641 dma_unmap_single(hostdata->dev,
642 evt_struct->iu.mad.adapter_info.buffer,
643 evt_struct->iu.mad.adapter_info.common.length,
644 DMA_BIDIRECTIONAL);
645
646 if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
647 printk("ibmvscsi: error %d getting adapter info\n",
648 evt_struct->xfer_iu->mad.adapter_info.common.status);
649 } else {
650 printk("ibmvscsi: host srp version: %s, "
651 "host partition %s (%d), OS %d, max io %u\n",
652 hostdata->madapter_info.srp_version,
653 hostdata->madapter_info.partition_name,
654 hostdata->madapter_info.partition_number,
655 hostdata->madapter_info.os_type,
656 hostdata->madapter_info.port_max_txu[0]);
657
658 if (hostdata->madapter_info.port_max_txu[0])
659 hostdata->host->max_sectors =
660 hostdata->madapter_info.port_max_txu[0] >> 9;
661 }
662}
663
664/**
665 * send_mad_adapter_info: - Sends the mad adapter info request
666 * and stores the result so it can be retrieved with
667 * sysfs. We COULD consider causing a failure if the
668 * returned SRP version doesn't match ours.
669 * @hostdata: ibmvscsi_host_data of host
670 *
671 * Returns zero if successful.
672*/
673static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
674{
675 struct viosrp_adapter_info *req;
676 struct srp_event_struct *evt_struct;
677
678 memset(&hostdata->madapter_info, 0x00, sizeof(hostdata->madapter_info));
679
680 evt_struct = get_event_struct(&hostdata->pool);
681 if (!evt_struct) {
682 printk(KERN_ERR "ibmvscsi: couldn't allocate an event "
683 "for ADAPTER_INFO_REQ!\n");
684 return;
685 }
686
687 init_event_struct(evt_struct,
688 adapter_info_rsp,
689 VIOSRP_MAD_FORMAT,
690 init_timeout * HZ);
691
692 req = &evt_struct->iu.mad.adapter_info;
693 memset(req, 0x00, sizeof(*req));
694
695 req->common.type = VIOSRP_ADAPTER_INFO_TYPE;
696 req->common.length = sizeof(hostdata->madapter_info);
697 req->buffer = dma_map_single(hostdata->dev,
698 &hostdata->madapter_info,
699 sizeof(hostdata->madapter_info),
700 DMA_BIDIRECTIONAL);
701
702 if (dma_mapping_error(req->buffer)) {
703 printk(KERN_ERR
704 "ibmvscsi: Unable to map request_buffer "
705 "for adapter_info!\n");
706 free_event_struct(&hostdata->pool, evt_struct);
707 return;
708 }
709
710 if (ibmvscsi_send_srp_event(evt_struct, hostdata))
711 printk(KERN_ERR "ibmvscsi: couldn't send ADAPTER_INFO_REQ!\n");
712};
713
714/**
715 * login_rsp: - Handle response to SRP login request
716 * @evt_struct: srp_event_struct with the response
717 *
718 * Used as a "done" callback by when sending srp_login. Gets called
719 * by ibmvscsi_handle_crq()
720*/
721static void login_rsp(struct srp_event_struct *evt_struct)
722{
723 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
724 switch (evt_struct->xfer_iu->srp.generic.type) {
725 case SRP_LOGIN_RSP_TYPE: /* it worked! */
726 break;
727 case SRP_LOGIN_REJ_TYPE: /* refused! */
728 printk(KERN_INFO "ibmvscsi: SRP_LOGIN_REQ rejected\n");
729 /* Login failed. */
730 atomic_set(&hostdata->request_limit, -1);
731 return;
732 default:
733 printk(KERN_ERR
734 "ibmvscsi: Invalid login response typecode 0x%02x!\n",
735 evt_struct->xfer_iu->srp.generic.type);
736 /* Login failed. */
737 atomic_set(&hostdata->request_limit, -1);
738 return;
739 }
740
741 printk(KERN_INFO "ibmvscsi: SRP_LOGIN succeeded\n");
742
743 if (evt_struct->xfer_iu->srp.login_rsp.request_limit_delta >
744 (max_requests - 2))
745 evt_struct->xfer_iu->srp.login_rsp.request_limit_delta =
746 max_requests - 2;
747
748 /* Now we know what the real request-limit is */
749 atomic_set(&hostdata->request_limit,
750 evt_struct->xfer_iu->srp.login_rsp.request_limit_delta);
751
752 hostdata->host->can_queue =
753 evt_struct->xfer_iu->srp.login_rsp.request_limit_delta - 2;
754
755 if (hostdata->host->can_queue < 1) {
756 printk(KERN_ERR "ibmvscsi: Invalid request_limit_delta\n");
757 return;
758 }
759
760 send_mad_adapter_info(hostdata);
761 return;
762}
763
764/**
765 * send_srp_login: - Sends the srp login
766 * @hostdata: ibmvscsi_host_data of host
767 *
768 * Returns zero if successful.
769*/
770static int send_srp_login(struct ibmvscsi_host_data *hostdata)
771{
772 int rc;
773 unsigned long flags;
774 struct srp_login_req *login;
775 struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
776 if (!evt_struct) {
777 printk(KERN_ERR
778 "ibmvscsi: couldn't allocate an event for login req!\n");
779 return FAILED;
780 }
781
782 init_event_struct(evt_struct,
783 login_rsp,
784 VIOSRP_SRP_FORMAT,
785 init_timeout * HZ);
786
787 login = &evt_struct->iu.srp.login_req;
788 login->type = SRP_LOGIN_REQ_TYPE;
789 login->max_requested_initiator_to_target_iulen = sizeof(union srp_iu);
790 login->required_buffer_formats = 0x0006;
791
792 /* Start out with a request limit of 1, since this is negotiated in
793 * the login request we are just sending
794 */
795 atomic_set(&hostdata->request_limit, 1);
796
797 spin_lock_irqsave(hostdata->host->host_lock, flags);
798 rc = ibmvscsi_send_srp_event(evt_struct, hostdata);
799 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
800 return rc;
801};
802
803/**
804 * sync_completion: Signal that a synchronous command has completed
805 * Note that after returning from this call, the evt_struct is freed.
806 * the caller waiting on this completion shouldn't touch the evt_struct
807 * again.
808 */
809static void sync_completion(struct srp_event_struct *evt_struct)
810{
811 /* copy the response back */
812 if (evt_struct->sync_srp)
813 *evt_struct->sync_srp = *evt_struct->xfer_iu;
814
815 complete(&evt_struct->comp);
816}
817
818/**
819 * ibmvscsi_abort: Abort a command...from scsi host template
820 * send this over to the server and wait synchronously for the response
821 */
822static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
823{
824 struct ibmvscsi_host_data *hostdata =
825 (struct ibmvscsi_host_data *)cmd->device->host->hostdata;
826 struct srp_tsk_mgmt *tsk_mgmt;
827 struct srp_event_struct *evt;
828 struct srp_event_struct *tmp_evt, *found_evt;
829 union viosrp_iu srp_rsp;
830 int rsp_rc;
831 u16 lun = lun_from_dev(cmd->device);
832
833 /* First, find this command in our sent list so we can figure
834 * out the correct tag
835 */
836 found_evt = NULL;
837 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
838 if (tmp_evt->cmnd == cmd) {
839 found_evt = tmp_evt;
840 break;
841 }
842 }
843
844 if (!found_evt)
845 return FAILED;
846
847 evt = get_event_struct(&hostdata->pool);
848 if (evt == NULL) {
849 printk(KERN_ERR "ibmvscsi: failed to allocate abort event\n");
850 return FAILED;
851 }
852
853 init_event_struct(evt,
854 sync_completion,
855 VIOSRP_SRP_FORMAT,
856 init_timeout * HZ);
857
858 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
859
860 /* Set up an abort SRP command */
861 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
862 tsk_mgmt->type = SRP_TSK_MGMT_TYPE;
863 tsk_mgmt->lun = ((u64) lun) << 48;
864 tsk_mgmt->task_mgmt_flags = 0x01; /* ABORT TASK */
865 tsk_mgmt->managed_task_tag = (u64) found_evt;
866
867 printk(KERN_INFO "ibmvscsi: aborting command. lun 0x%lx, tag 0x%lx\n",
868 tsk_mgmt->lun, tsk_mgmt->managed_task_tag);
869
870 evt->sync_srp = &srp_rsp;
871 init_completion(&evt->comp);
872 if (ibmvscsi_send_srp_event(evt, hostdata) != 0) {
873 printk(KERN_ERR "ibmvscsi: failed to send abort() event\n");
874 return FAILED;
875 }
876
877 spin_unlock_irq(hostdata->host->host_lock);
878 wait_for_completion(&evt->comp);
879 spin_lock_irq(hostdata->host->host_lock);
880
881 /* make sure we got a good response */
882 if (unlikely(srp_rsp.srp.generic.type != SRP_RSP_TYPE)) {
883 if (printk_ratelimit())
884 printk(KERN_WARNING
885 "ibmvscsi: abort bad SRP RSP type %d\n",
886 srp_rsp.srp.generic.type);
887 return FAILED;
888 }
889
890 if (srp_rsp.srp.rsp.rspvalid)
891 rsp_rc = *((int *)srp_rsp.srp.rsp.sense_and_response_data);
892 else
893 rsp_rc = srp_rsp.srp.rsp.status;
894
895 if (rsp_rc) {
896 if (printk_ratelimit())
897 printk(KERN_WARNING
898 "ibmvscsi: abort code %d for task tag 0x%lx\n",
899 rsp_rc,
900 tsk_mgmt->managed_task_tag);
901 return FAILED;
902 }
903
904 /* Because we dropped the spinlock above, it's possible
905 * The event is no longer in our list. Make sure it didn't
906 * complete while we were aborting
907 */
908 found_evt = NULL;
909 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
910 if (tmp_evt->cmnd == cmd) {
911 found_evt = tmp_evt;
912 break;
913 }
914 }
915
916 if (found_evt == NULL) {
917 printk(KERN_INFO
918 "ibmvscsi: aborted task tag 0x%lx completed\n",
919 tsk_mgmt->managed_task_tag);
920 return SUCCESS;
921 }
922
923 printk(KERN_INFO
924 "ibmvscsi: successfully aborted task tag 0x%lx\n",
925 tsk_mgmt->managed_task_tag);
926
927 cmd->result = (DID_ABORT << 16);
928 list_del(&found_evt->list);
929 unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt->hostdata->dev);
930 free_event_struct(&found_evt->hostdata->pool, found_evt);
931 atomic_inc(&hostdata->request_limit);
932 return SUCCESS;
933}
934
935/**
936 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
937 * template send this over to the server and wait synchronously for the
938 * response
939 */
940static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
941{
942 struct ibmvscsi_host_data *hostdata =
943 (struct ibmvscsi_host_data *)cmd->device->host->hostdata;
944
945 struct srp_tsk_mgmt *tsk_mgmt;
946 struct srp_event_struct *evt;
947 struct srp_event_struct *tmp_evt, *pos;
948 union viosrp_iu srp_rsp;
949 int rsp_rc;
950 u16 lun = lun_from_dev(cmd->device);
951
952 evt = get_event_struct(&hostdata->pool);
953 if (evt == NULL) {
954 printk(KERN_ERR "ibmvscsi: failed to allocate reset event\n");
955 return FAILED;
956 }
957
958 init_event_struct(evt,
959 sync_completion,
960 VIOSRP_SRP_FORMAT,
961 init_timeout * HZ);
962
963 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
964
965 /* Set up a lun reset SRP command */
966 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
967 tsk_mgmt->type = SRP_TSK_MGMT_TYPE;
968 tsk_mgmt->lun = ((u64) lun) << 48;
969 tsk_mgmt->task_mgmt_flags = 0x08; /* LUN RESET */
970
971 printk(KERN_INFO "ibmvscsi: resetting device. lun 0x%lx\n",
972 tsk_mgmt->lun);
973
974 evt->sync_srp = &srp_rsp;
975 init_completion(&evt->comp);
976 if (ibmvscsi_send_srp_event(evt, hostdata) != 0) {
977 printk(KERN_ERR "ibmvscsi: failed to send reset event\n");
978 return FAILED;
979 }
980
981 spin_unlock_irq(hostdata->host->host_lock);
982 wait_for_completion(&evt->comp);
983 spin_lock_irq(hostdata->host->host_lock);
984
985 /* make sure we got a good response */
986 if (unlikely(srp_rsp.srp.generic.type != SRP_RSP_TYPE)) {
987 if (printk_ratelimit())
988 printk(KERN_WARNING
989 "ibmvscsi: reset bad SRP RSP type %d\n",
990 srp_rsp.srp.generic.type);
991 return FAILED;
992 }
993
994 if (srp_rsp.srp.rsp.rspvalid)
995 rsp_rc = *((int *)srp_rsp.srp.rsp.sense_and_response_data);
996 else
997 rsp_rc = srp_rsp.srp.rsp.status;
998
999 if (rsp_rc) {
1000 if (printk_ratelimit())
1001 printk(KERN_WARNING
1002 "ibmvscsi: reset code %d for task tag 0x%lx\n",
1003 rsp_rc,
1004 tsk_mgmt->managed_task_tag);
1005 return FAILED;
1006 }
1007
1008 /* We need to find all commands for this LUN that have not yet been
1009 * responded to, and fail them with DID_RESET
1010 */
1011 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1012 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1013 if (tmp_evt->cmnd)
1014 tmp_evt->cmnd->result = (DID_RESET << 16);
1015 list_del(&tmp_evt->list);
1016 unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt->hostdata->dev);
1017 free_event_struct(&tmp_evt->hostdata->pool,
1018 tmp_evt);
1019 atomic_inc(&hostdata->request_limit);
1020 if (tmp_evt->cmnd_done)
1021 tmp_evt->cmnd_done(tmp_evt->cmnd);
1022 else if (tmp_evt->done)
1023 tmp_evt->done(tmp_evt);
1024 }
1025 }
1026 return SUCCESS;
1027}
1028
1029/**
1030 * purge_requests: Our virtual adapter just shut down. purge any sent requests
1031 * @hostdata: the adapter
1032 */
1033static void purge_requests(struct ibmvscsi_host_data *hostdata)
1034{
1035 struct srp_event_struct *tmp_evt, *pos;
1036 unsigned long flags;
1037
1038 spin_lock_irqsave(hostdata->host->host_lock, flags);
1039 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1040 list_del(&tmp_evt->list);
1041 if (tmp_evt->cmnd) {
1042 tmp_evt->cmnd->result = (DID_ERROR << 16);
1043 unmap_cmd_data(&tmp_evt->iu.srp.cmd,
1044 tmp_evt->hostdata->dev);
1045 if (tmp_evt->cmnd_done)
1046 tmp_evt->cmnd_done(tmp_evt->cmnd);
1047 } else {
1048 if (tmp_evt->done) {
1049 tmp_evt->done(tmp_evt);
1050 }
1051 }
1052 free_event_struct(&tmp_evt->hostdata->pool, tmp_evt);
1053 }
1054 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1055}
1056
1057/**
1058 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1059 * @crq: Command/Response queue
1060 * @hostdata: ibmvscsi_host_data of host
1061 *
1062*/
1063void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1064 struct ibmvscsi_host_data *hostdata)
1065{
1066 unsigned long flags;
1067 struct srp_event_struct *evt_struct =
1068 (struct srp_event_struct *)crq->IU_data_ptr;
1069 switch (crq->valid) {
1070 case 0xC0: /* initialization */
1071 switch (crq->format) {
1072 case 0x01: /* Initialization message */
1073 printk(KERN_INFO "ibmvscsi: partner initialized\n");
1074 /* Send back a response */
1075 if (ibmvscsi_send_crq(hostdata,
1076 0xC002000000000000LL, 0) == 0) {
1077 /* Now login */
1078 send_srp_login(hostdata);
1079 } else {
1080 printk(KERN_ERR
1081 "ibmvscsi: Unable to send init rsp\n");
1082 }
1083
1084 break;
1085 case 0x02: /* Initialization response */
1086 printk(KERN_INFO
1087 "ibmvscsi: partner initialization complete\n");
1088
1089 /* Now login */
1090 send_srp_login(hostdata);
1091 break;
1092 default:
1093 printk(KERN_ERR "ibmvscsi: unknown crq message type\n");
1094 }
1095 return;
1096 case 0xFF: /* Hypervisor telling us the connection is closed */
1097 printk(KERN_INFO "ibmvscsi: Virtual adapter failed!\n");
1098
1099 atomic_set(&hostdata->request_limit, -1);
1100 purge_requests(hostdata);
1101 ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
1102 return;
1103 case 0x80: /* real payload */
1104 break;
1105 default:
1106 printk(KERN_ERR
1107 "ibmvscsi: got an invalid message type 0x%02x\n",
1108 crq->valid);
1109 return;
1110 }
1111
1112 /* The only kind of payload CRQs we should get are responses to
1113 * things we send. Make sure this response is to something we
1114 * actually sent
1115 */
1116 if (!valid_event_struct(&hostdata->pool, evt_struct)) {
1117 printk(KERN_ERR
1118 "ibmvscsi: returned correlation_token 0x%p is invalid!\n",
1119 (void *)crq->IU_data_ptr);
1120 return;
1121 }
1122
1123 if (atomic_read(&evt_struct->free)) {
1124 printk(KERN_ERR
1125 "ibmvscsi: received duplicate correlation_token 0x%p!\n",
1126 (void *)crq->IU_data_ptr);
1127 return;
1128 }
1129
1130 if (crq->format == VIOSRP_SRP_FORMAT)
1131 atomic_add(evt_struct->xfer_iu->srp.rsp.request_limit_delta,
1132 &hostdata->request_limit);
1133
1134 if (evt_struct->done)
1135 evt_struct->done(evt_struct);
1136 else
1137 printk(KERN_ERR
1138 "ibmvscsi: returned done() is NULL; not running it!\n");
1139
1140 /*
1141 * Lock the host_lock before messing with these structures, since we
1142 * are running in a task context
1143 */
1144 spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1145 list_del(&evt_struct->list);
1146 free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1147 spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1148}
1149
1150/**
1151 * ibmvscsi_get_host_config: Send the command to the server to get host
1152 * configuration data. The data is opaque to us.
1153 */
1154static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata,
1155 unsigned char *buffer, int length)
1156{
1157 struct viosrp_host_config *host_config;
1158 struct srp_event_struct *evt_struct;
1159 int rc;
1160
1161 evt_struct = get_event_struct(&hostdata->pool);
1162 if (!evt_struct) {
1163 printk(KERN_ERR
1164 "ibmvscsi: could't allocate event for HOST_CONFIG!\n");
1165 return -1;
1166 }
1167
1168 init_event_struct(evt_struct,
1169 sync_completion,
1170 VIOSRP_MAD_FORMAT,
1171 init_timeout * HZ);
1172
1173 host_config = &evt_struct->iu.mad.host_config;
1174
1175 /* Set up a lun reset SRP command */
1176 memset(host_config, 0x00, sizeof(*host_config));
1177 host_config->common.type = VIOSRP_HOST_CONFIG_TYPE;
1178 host_config->common.length = length;
1179 host_config->buffer = dma_map_single(hostdata->dev, buffer, length,
1180 DMA_BIDIRECTIONAL);
1181
1182 if (dma_mapping_error(host_config->buffer)) {
1183 printk(KERN_ERR
1184 "ibmvscsi: dma_mapping error " "getting host config\n");
1185 free_event_struct(&hostdata->pool, evt_struct);
1186 return -1;
1187 }
1188
1189 init_completion(&evt_struct->comp);
1190 rc = ibmvscsi_send_srp_event(evt_struct, hostdata);
1191 if (rc == 0) {
1192 wait_for_completion(&evt_struct->comp);
1193 dma_unmap_single(hostdata->dev, host_config->buffer,
1194 length, DMA_BIDIRECTIONAL);
1195 }
1196
1197 return rc;
1198}
1199
1200/* ------------------------------------------------------------
1201 * sysfs attributes
1202 */
1203static ssize_t show_host_srp_version(struct class_device *class_dev, char *buf)
1204{
1205 struct Scsi_Host *shost = class_to_shost(class_dev);
1206 struct ibmvscsi_host_data *hostdata =
1207 (struct ibmvscsi_host_data *)shost->hostdata;
1208 int len;
1209
1210 len = snprintf(buf, PAGE_SIZE, "%s\n",
1211 hostdata->madapter_info.srp_version);
1212 return len;
1213}
1214
1215static struct class_device_attribute ibmvscsi_host_srp_version = {
1216 .attr = {
1217 .name = "srp_version",
1218 .mode = S_IRUGO,
1219 },
1220 .show = show_host_srp_version,
1221};
1222
1223static ssize_t show_host_partition_name(struct class_device *class_dev,
1224 char *buf)
1225{
1226 struct Scsi_Host *shost = class_to_shost(class_dev);
1227 struct ibmvscsi_host_data *hostdata =
1228 (struct ibmvscsi_host_data *)shost->hostdata;
1229 int len;
1230
1231 len = snprintf(buf, PAGE_SIZE, "%s\n",
1232 hostdata->madapter_info.partition_name);
1233 return len;
1234}
1235
1236static struct class_device_attribute ibmvscsi_host_partition_name = {
1237 .attr = {
1238 .name = "partition_name",
1239 .mode = S_IRUGO,
1240 },
1241 .show = show_host_partition_name,
1242};
1243
1244static ssize_t show_host_partition_number(struct class_device *class_dev,
1245 char *buf)
1246{
1247 struct Scsi_Host *shost = class_to_shost(class_dev);
1248 struct ibmvscsi_host_data *hostdata =
1249 (struct ibmvscsi_host_data *)shost->hostdata;
1250 int len;
1251
1252 len = snprintf(buf, PAGE_SIZE, "%d\n",
1253 hostdata->madapter_info.partition_number);
1254 return len;
1255}
1256
1257static struct class_device_attribute ibmvscsi_host_partition_number = {
1258 .attr = {
1259 .name = "partition_number",
1260 .mode = S_IRUGO,
1261 },
1262 .show = show_host_partition_number,
1263};
1264
1265static ssize_t show_host_mad_version(struct class_device *class_dev, char *buf)
1266{
1267 struct Scsi_Host *shost = class_to_shost(class_dev);
1268 struct ibmvscsi_host_data *hostdata =
1269 (struct ibmvscsi_host_data *)shost->hostdata;
1270 int len;
1271
1272 len = snprintf(buf, PAGE_SIZE, "%d\n",
1273 hostdata->madapter_info.mad_version);
1274 return len;
1275}
1276
1277static struct class_device_attribute ibmvscsi_host_mad_version = {
1278 .attr = {
1279 .name = "mad_version",
1280 .mode = S_IRUGO,
1281 },
1282 .show = show_host_mad_version,
1283};
1284
1285static ssize_t show_host_os_type(struct class_device *class_dev, char *buf)
1286{
1287 struct Scsi_Host *shost = class_to_shost(class_dev);
1288 struct ibmvscsi_host_data *hostdata =
1289 (struct ibmvscsi_host_data *)shost->hostdata;
1290 int len;
1291
1292 len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type);
1293 return len;
1294}
1295
1296static struct class_device_attribute ibmvscsi_host_os_type = {
1297 .attr = {
1298 .name = "os_type",
1299 .mode = S_IRUGO,
1300 },
1301 .show = show_host_os_type,
1302};
1303
1304static ssize_t show_host_config(struct class_device *class_dev, char *buf)
1305{
1306 struct Scsi_Host *shost = class_to_shost(class_dev);
1307 struct ibmvscsi_host_data *hostdata =
1308 (struct ibmvscsi_host_data *)shost->hostdata;
1309
1310 /* returns null-terminated host config data */
1311 if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0)
1312 return strlen(buf);
1313 else
1314 return 0;
1315}
1316
1317static struct class_device_attribute ibmvscsi_host_config = {
1318 .attr = {
1319 .name = "config",
1320 .mode = S_IRUGO,
1321 },
1322 .show = show_host_config,
1323};
1324
1325static struct class_device_attribute *ibmvscsi_attrs[] = {
1326 &ibmvscsi_host_srp_version,
1327 &ibmvscsi_host_partition_name,
1328 &ibmvscsi_host_partition_number,
1329 &ibmvscsi_host_mad_version,
1330 &ibmvscsi_host_os_type,
1331 &ibmvscsi_host_config,
1332 NULL
1333};
1334
1335/* ------------------------------------------------------------
1336 * SCSI driver registration
1337 */
1338static struct scsi_host_template driver_template = {
1339 .module = THIS_MODULE,
1340 .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
1341 .proc_name = "ibmvscsi",
1342 .queuecommand = ibmvscsi_queuecommand,
1343 .eh_abort_handler = ibmvscsi_eh_abort_handler,
1344 .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
1345 .cmd_per_lun = 16,
1346 .can_queue = 1, /* Updated after SRP_LOGIN */
1347 .this_id = -1,
1348 .sg_tablesize = MAX_INDIRECT_BUFS,
1349 .use_clustering = ENABLE_CLUSTERING,
1350 .shost_attrs = ibmvscsi_attrs,
1351};
1352
1353/**
1354 * Called by bus code for each adapter
1355 */
1356static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1357{
1358 struct ibmvscsi_host_data *hostdata;
1359 struct Scsi_Host *host;
1360 struct device *dev = &vdev->dev;
1361 unsigned long wait_switch = 0;
1362
1363 vdev->dev.driver_data = NULL;
1364
1365 host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
1366 if (!host) {
1367 printk(KERN_ERR "ibmvscsi: couldn't allocate host data\n");
1368 goto scsi_host_alloc_failed;
1369 }
1370
1371 hostdata = (struct ibmvscsi_host_data *)host->hostdata;
1372 memset(hostdata, 0x00, sizeof(*hostdata));
1373 INIT_LIST_HEAD(&hostdata->sent);
1374 hostdata->host = host;
1375 hostdata->dev = dev;
1376 atomic_set(&hostdata->request_limit, -1);
1377 hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */
1378
1379 if (ibmvscsi_init_crq_queue(&hostdata->queue, hostdata,
1380 max_requests) != 0) {
1381 printk(KERN_ERR "ibmvscsi: couldn't initialize crq\n");
1382 goto init_crq_failed;
1383 }
1384 if (initialize_event_pool(&hostdata->pool, max_requests, hostdata) != 0) {
1385 printk(KERN_ERR "ibmvscsi: couldn't initialize event pool\n");
1386 goto init_pool_failed;
1387 }
1388
1389 host->max_lun = 8;
1390 host->max_id = max_id;
1391 host->max_channel = max_channel;
1392
1393 if (scsi_add_host(hostdata->host, hostdata->dev))
1394 goto add_host_failed;
1395
1396 /* Try to send an initialization message. Note that this is allowed
1397 * to fail if the other end is not acive. In that case we don't
1398 * want to scan
1399 */
1400 if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0) {
1401 /*
1402 * Wait around max init_timeout secs for the adapter to finish
1403 * initializing. When we are done initializing, we will have a
1404 * valid request_limit. We don't want Linux scanning before
1405 * we are ready.
1406 */
1407 for (wait_switch = jiffies + (init_timeout * HZ);
1408 time_before(jiffies, wait_switch) &&
1409 atomic_read(&hostdata->request_limit) < 2;) {
1410
1411 msleep(10);
1412 }
1413
1414 /* if we now have a valid request_limit, initiate a scan */
1415 if (atomic_read(&hostdata->request_limit) > 0)
1416 scsi_scan_host(host);
1417 }
1418
1419 vdev->dev.driver_data = hostdata;
1420 return 0;
1421
1422 add_host_failed:
1423 release_event_pool(&hostdata->pool, hostdata);
1424 init_pool_failed:
1425 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_requests);
1426 init_crq_failed:
1427 scsi_host_put(host);
1428 scsi_host_alloc_failed:
1429 return -1;
1430}
1431
1432static int ibmvscsi_remove(struct vio_dev *vdev)
1433{
1434 struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data;
1435 release_event_pool(&hostdata->pool, hostdata);
1436 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
1437 max_requests);
1438
1439 scsi_remove_host(hostdata->host);
1440 scsi_host_put(hostdata->host);
1441
1442 return 0;
1443}
1444
1445/**
1446 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
1447 * support.
1448 */
1449static struct vio_device_id ibmvscsi_device_table[] __devinitdata = {
1450 {"vscsi", "IBM,v-scsi"},
1451 {0,}
1452};
1453
1454MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
1455static struct vio_driver ibmvscsi_driver = {
1456 .name = "ibmvscsi",
1457 .id_table = ibmvscsi_device_table,
1458 .probe = ibmvscsi_probe,
1459 .remove = ibmvscsi_remove
1460};
1461
1462int __init ibmvscsi_module_init(void)
1463{
1464 return vio_register_driver(&ibmvscsi_driver);
1465}
1466
1467void __exit ibmvscsi_module_exit(void)
1468{
1469 vio_unregister_driver(&ibmvscsi_driver);
1470}
1471
1472module_init(ibmvscsi_module_init);
1473module_exit(ibmvscsi_module_exit);
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.h b/drivers/scsi/ibmvscsi/ibmvscsi.h
new file mode 100644
index 000000000000..1030b703c30e
--- /dev/null
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.h
@@ -0,0 +1,109 @@
1/* ------------------------------------------------------------
2 * ibmvscsi.h
3 * (C) Copyright IBM Corporation 1994, 2003
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 allows the Linux SCSI peripheral drivers to directly
27 * access devices in the hosting partition, either on an iSeries
28 * hypervisor system or a converged hypervisor system.
29 */
30#ifndef IBMVSCSI_H
31#define IBMVSCSI_H
32#include <linux/types.h>
33#include <linux/list.h>
34#include <linux/completion.h>
35#include <linux/interrupt.h>
36#include "viosrp.h"
37
38struct scsi_cmnd;
39struct Scsi_Host;
40
41/* Number of indirect bufs...the list of these has to fit in the
42 * additional data of the srp_cmd struct along with the indirect
43 * descriptor
44 */
45#define MAX_INDIRECT_BUFS 10
46
47/* ------------------------------------------------------------
48 * Data Structures
49 */
50/* an RPA command/response transport queue */
51struct crq_queue {
52 struct viosrp_crq *msgs;
53 int size, cur;
54 dma_addr_t msg_token;
55 spinlock_t lock;
56};
57
58/* a unit of work for the hosting partition */
59struct srp_event_struct {
60 union viosrp_iu *xfer_iu;
61 struct scsi_cmnd *cmnd;
62 struct list_head list;
63 void (*done) (struct srp_event_struct *);
64 struct viosrp_crq crq;
65 struct ibmvscsi_host_data *hostdata;
66 atomic_t free;
67 union viosrp_iu iu;
68 void (*cmnd_done) (struct scsi_cmnd *);
69 struct completion comp;
70 union viosrp_iu *sync_srp;
71};
72
73/* a pool of event structs for use */
74struct event_pool {
75 struct srp_event_struct *events;
76 u32 size;
77 int next;
78 union viosrp_iu *iu_storage;
79 dma_addr_t iu_token;
80};
81
82/* all driver data associated with a host adapter */
83struct ibmvscsi_host_data {
84 atomic_t request_limit;
85 struct device *dev;
86 struct event_pool pool;
87 struct crq_queue queue;
88 struct tasklet_struct srp_task;
89 struct list_head sent;
90 struct Scsi_Host *host;
91 struct mad_adapter_info_data madapter_info;
92};
93
94/* routines for managing a command/response queue */
95int ibmvscsi_init_crq_queue(struct crq_queue *queue,
96 struct ibmvscsi_host_data *hostdata,
97 int max_requests);
98void ibmvscsi_release_crq_queue(struct crq_queue *queue,
99 struct ibmvscsi_host_data *hostdata,
100 int max_requests);
101void ibmvscsi_reset_crq_queue(struct crq_queue *queue,
102 struct ibmvscsi_host_data *hostdata);
103
104void ibmvscsi_handle_crq(struct viosrp_crq *crq,
105 struct ibmvscsi_host_data *hostdata);
106int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
107 u64 word1, u64 word2);
108
109#endif /* IBMVSCSI_H */
diff --git a/drivers/scsi/ibmvscsi/iseries_vscsi.c b/drivers/scsi/ibmvscsi/iseries_vscsi.c
new file mode 100644
index 000000000000..e9202f2a8276
--- /dev/null
+++ b/drivers/scsi/ibmvscsi/iseries_vscsi.c
@@ -0,0 +1,144 @@
1/* ------------------------------------------------------------
2 * iSeries_vscsi.c
3 * (C) Copyright IBM Corporation 1994, 2003
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 * iSeries-specific functions of the SCSI host adapter for Virtual I/O devices
25 *
26 * This driver allows the Linux SCSI peripheral drivers to directly
27 * access devices in the hosting partition, either on an iSeries
28 * hypervisor system or a converged hypervisor system.
29 */
30
31#include <asm/iSeries/vio.h>
32#include <asm/iSeries/HvLpEvent.h>
33#include <asm/iSeries/HvTypes.h>
34#include <asm/iSeries/HvLpConfig.h>
35#include <asm/vio.h>
36#include <linux/device.h>
37#include "ibmvscsi.h"
38
39/* global variables */
40static struct ibmvscsi_host_data *single_host_data;
41
42/* ------------------------------------------------------------
43 * Routines for direct interpartition interaction
44 */
45struct srp_lp_event {
46 struct HvLpEvent lpevt; /* 0x00-0x17 */
47 u32 reserved1; /* 0x18-0x1B; unused */
48 u16 version; /* 0x1C-0x1D; unused */
49 u16 subtype_rc; /* 0x1E-0x1F; unused */
50 struct viosrp_crq crq; /* 0x20-0x3F */
51};
52
53/**
54 * standard interface for handling logical partition events.
55 */
56static void ibmvscsi_handle_event(struct HvLpEvent *lpevt)
57{
58 struct srp_lp_event *evt = (struct srp_lp_event *)lpevt;
59
60 if (!evt) {
61 printk(KERN_ERR "ibmvscsi: received null event\n");
62 return;
63 }
64
65 if (single_host_data == NULL) {
66 printk(KERN_ERR
67 "ibmvscsi: received event, no adapter present\n");
68 return;
69 }
70
71 ibmvscsi_handle_crq(&evt->crq, single_host_data);
72}
73
74/* ------------------------------------------------------------
75 * Routines for driver initialization
76 */
77int ibmvscsi_init_crq_queue(struct crq_queue *queue,
78 struct ibmvscsi_host_data *hostdata,
79 int max_requests)
80{
81 int rc;
82
83 single_host_data = hostdata;
84 rc = viopath_open(viopath_hostLp, viomajorsubtype_scsi, 0);
85 if (rc < 0) {
86 printk("viopath_open failed with rc %d in open_event_path\n",
87 rc);
88 goto viopath_open_failed;
89 }
90
91 rc = vio_setHandler(viomajorsubtype_scsi, ibmvscsi_handle_event);
92 if (rc < 0) {
93 printk("vio_setHandler failed with rc %d in open_event_path\n",
94 rc);
95 goto vio_setHandler_failed;
96 }
97 return 0;
98
99 vio_setHandler_failed:
100 viopath_close(viopath_hostLp, viomajorsubtype_scsi, max_requests);
101 viopath_open_failed:
102 return -1;
103}
104
105void ibmvscsi_release_crq_queue(struct crq_queue *queue,
106 struct ibmvscsi_host_data *hostdata,
107 int max_requests)
108{
109 vio_clearHandler(viomajorsubtype_scsi);
110 viopath_close(viopath_hostLp, viomajorsubtype_scsi, max_requests);
111}
112
113/**
114 * reset_crq_queue: - resets a crq after a failure
115 * @queue: crq_queue to initialize and register
116 * @hostdata: ibmvscsi_host_data of host
117 *
118 * no-op for iSeries
119 */
120void ibmvscsi_reset_crq_queue(struct crq_queue *queue,
121 struct ibmvscsi_host_data *hostdata)
122{
123}
124
125/**
126 * ibmvscsi_send_crq: - Send a CRQ
127 * @hostdata: the adapter
128 * @word1: the first 64 bits of the data
129 * @word2: the second 64 bits of the data
130 */
131int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, u64 word1, u64 word2)
132{
133 single_host_data = hostdata;
134 return HvCallEvent_signalLpEventFast(viopath_hostLp,
135 HvLpEvent_Type_VirtualIo,
136 viomajorsubtype_scsi,
137 HvLpEvent_AckInd_NoAck,
138 HvLpEvent_AckType_ImmediateAck,
139 viopath_sourceinst(viopath_hostLp),
140 viopath_targetinst(viopath_hostLp),
141 0,
142 VIOVERSION << 16, word1, word2, 0,
143 0);
144}
diff --git a/drivers/scsi/ibmvscsi/rpa_vscsi.c b/drivers/scsi/ibmvscsi/rpa_vscsi.c
new file mode 100644
index 000000000000..50cb909f314f
--- /dev/null
+++ b/drivers/scsi/ibmvscsi/rpa_vscsi.c
@@ -0,0 +1,260 @@
1/* ------------------------------------------------------------
2 * rpa_vscsi.c
3 * (C) Copyright IBM Corporation 1994, 2003
4 * Authors: Colin DeVilbiss (devilbis@us.ibm.com)
5 * Santiago Leon (santil@us.ibm.com)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20 * USA
21 *
22 * ------------------------------------------------------------
23 * RPA-specific functions of the SCSI host adapter for Virtual I/O devices
24 *
25 * This driver allows the Linux SCSI peripheral drivers to directly
26 * access devices in the hosting partition, either on an iSeries
27 * hypervisor system or a converged hypervisor system.
28 */
29
30#include <asm/vio.h>
31#include <asm/iommu.h>
32#include <asm/hvcall.h>
33#include <linux/dma-mapping.h>
34#include <linux/interrupt.h>
35#include "ibmvscsi.h"
36
37/* ------------------------------------------------------------
38 * Routines for managing the command/response queue
39 */
40/**
41 * ibmvscsi_handle_event: - Interrupt handler for crq events
42 * @irq: number of irq to handle, not used
43 * @dev_instance: ibmvscsi_host_data of host that received interrupt
44 * @regs: pt_regs with registers
45 *
46 * Disables interrupts and schedules srp_task
47 * Always returns IRQ_HANDLED
48 */
49static irqreturn_t ibmvscsi_handle_event(int irq,
50 void *dev_instance,
51 struct pt_regs *regs)
52{
53 struct ibmvscsi_host_data *hostdata =
54 (struct ibmvscsi_host_data *)dev_instance;
55 vio_disable_interrupts(to_vio_dev(hostdata->dev));
56 tasklet_schedule(&hostdata->srp_task);
57 return IRQ_HANDLED;
58}
59
60/**
61 * release_crq_queue: - Deallocates data and unregisters CRQ
62 * @queue: crq_queue to initialize and register
63 * @host_data: ibmvscsi_host_data of host
64 *
65 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
66 * the crq with the hypervisor.
67 */
68void ibmvscsi_release_crq_queue(struct crq_queue *queue,
69 struct ibmvscsi_host_data *hostdata,
70 int max_requests)
71{
72 long rc;
73 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
74 free_irq(vdev->irq, (void *)hostdata);
75 tasklet_kill(&hostdata->srp_task);
76 do {
77 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
78 } while ((rc == H_Busy) || (H_isLongBusy(rc)));
79 dma_unmap_single(hostdata->dev,
80 queue->msg_token,
81 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
82 free_page((unsigned long)queue->msgs);
83}
84
85/**
86 * crq_queue_next_crq: - Returns the next entry in message queue
87 * @queue: crq_queue to use
88 *
89 * Returns pointer to next entry in queue, or NULL if there are no new
90 * entried in the CRQ.
91 */
92static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue)
93{
94 struct viosrp_crq *crq;
95 unsigned long flags;
96
97 spin_lock_irqsave(&queue->lock, flags);
98 crq = &queue->msgs[queue->cur];
99 if (crq->valid & 0x80) {
100 if (++queue->cur == queue->size)
101 queue->cur = 0;
102 } else
103 crq = NULL;
104 spin_unlock_irqrestore(&queue->lock, flags);
105
106 return crq;
107}
108
109/**
110 * ibmvscsi_send_crq: - Send a CRQ
111 * @hostdata: the adapter
112 * @word1: the first 64 bits of the data
113 * @word2: the second 64 bits of the data
114 */
115int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, u64 word1, u64 word2)
116{
117 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
118
119 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
120}
121
122/**
123 * ibmvscsi_task: - Process srps asynchronously
124 * @data: ibmvscsi_host_data of host
125 */
126static void ibmvscsi_task(void *data)
127{
128 struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data;
129 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
130 struct viosrp_crq *crq;
131 int done = 0;
132
133 while (!done) {
134 /* Pull all the valid messages off the CRQ */
135 while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
136 ibmvscsi_handle_crq(crq, hostdata);
137 crq->valid = 0x00;
138 }
139
140 vio_enable_interrupts(vdev);
141 if ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
142 vio_disable_interrupts(vdev);
143 ibmvscsi_handle_crq(crq, hostdata);
144 crq->valid = 0x00;
145 } else {
146 done = 1;
147 }
148 }
149}
150
151/**
152 * initialize_crq_queue: - Initializes and registers CRQ with hypervisor
153 * @queue: crq_queue to initialize and register
154 * @hostdata: ibmvscsi_host_data of host
155 *
156 * Allocates a page for messages, maps it for dma, and registers
157 * the crq with the hypervisor.
158 * Returns zero on success.
159 */
160int ibmvscsi_init_crq_queue(struct crq_queue *queue,
161 struct ibmvscsi_host_data *hostdata,
162 int max_requests)
163{
164 int rc;
165 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
166
167 queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
168
169 if (!queue->msgs)
170 goto malloc_failed;
171 queue->size = PAGE_SIZE / sizeof(*queue->msgs);
172
173 queue->msg_token = dma_map_single(hostdata->dev, queue->msgs,
174 queue->size * sizeof(*queue->msgs),
175 DMA_BIDIRECTIONAL);
176
177 if (dma_mapping_error(queue->msg_token))
178 goto map_failed;
179
180 rc = plpar_hcall_norets(H_REG_CRQ,
181 vdev->unit_address,
182 queue->msg_token, PAGE_SIZE);
183 if (rc == 2) {
184 /* Adapter is good, but other end is not ready */
185 printk(KERN_WARNING "ibmvscsi: Partner adapter not ready\n");
186 } else if (rc != 0) {
187 printk(KERN_WARNING "ibmvscsi: Error %d opening adapter\n", rc);
188 goto reg_crq_failed;
189 }
190
191 if (request_irq(vdev->irq,
192 ibmvscsi_handle_event,
193 0, "ibmvscsi", (void *)hostdata) != 0) {
194 printk(KERN_ERR "ibmvscsi: couldn't register irq 0x%x\n",
195 vdev->irq);
196 goto req_irq_failed;
197 }
198
199 rc = vio_enable_interrupts(vdev);
200 if (rc != 0) {
201 printk(KERN_ERR "ibmvscsi: Error %d enabling interrupts!!!\n",
202 rc);
203 goto req_irq_failed;
204 }
205
206 queue->cur = 0;
207 spin_lock_init(&queue->lock);
208
209 tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task,
210 (unsigned long)hostdata);
211
212 return 0;
213
214 req_irq_failed:
215 do {
216 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
217 } while ((rc == H_Busy) || (H_isLongBusy(rc)));
218 reg_crq_failed:
219 dma_unmap_single(hostdata->dev,
220 queue->msg_token,
221 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
222 map_failed:
223 free_page((unsigned long)queue->msgs);
224 malloc_failed:
225 return -1;
226}
227
228/**
229 * reset_crq_queue: - resets a crq after a failure
230 * @queue: crq_queue to initialize and register
231 * @hostdata: ibmvscsi_host_data of host
232 *
233 */
234void ibmvscsi_reset_crq_queue(struct crq_queue *queue,
235 struct ibmvscsi_host_data *hostdata)
236{
237 int rc;
238 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
239
240 /* Close the CRQ */
241 do {
242 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
243 } while ((rc == H_Busy) || (H_isLongBusy(rc)));
244
245 /* Clean out the queue */
246 memset(queue->msgs, 0x00, PAGE_SIZE);
247 queue->cur = 0;
248
249 /* And re-open it again */
250 rc = plpar_hcall_norets(H_REG_CRQ,
251 vdev->unit_address,
252 queue->msg_token, PAGE_SIZE);
253 if (rc == 2) {
254 /* Adapter is good, but other end is not ready */
255 printk(KERN_WARNING "ibmvscsi: Partner adapter not ready\n");
256 } else if (rc != 0) {
257 printk(KERN_WARNING
258 "ibmvscsi: couldn't register crq--rc 0x%x\n", rc);
259 }
260}
diff --git a/drivers/scsi/ibmvscsi/srp.h b/drivers/scsi/ibmvscsi/srp.h
new file mode 100644
index 000000000000..e952c1cd9740
--- /dev/null
+++ b/drivers/scsi/ibmvscsi/srp.h
@@ -0,0 +1,225 @@
1/*****************************************************************************/
2/* srp.h -- SCSI RDMA Protocol definitions */
3/* */
4/* Written By: Colin Devilbis, IBM Corporation */
5/* */
6/* Copyright (C) 2003 IBM Corporation */
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 USA */
21/* */
22/* */
23/* This file contains structures and definitions for the SCSI RDMA Protocol */
24/* (SRP) as defined in the T10 standard available at www.t10.org. This */
25/* file was based on the 16a version of the standard */
26/* */
27/*****************************************************************************/
28#ifndef SRP_H
29#define SRP_H
30
31#define PACKED __attribute__((packed))
32
33enum srp_types {
34 SRP_LOGIN_REQ_TYPE = 0x00,
35 SRP_LOGIN_RSP_TYPE = 0xC0,
36 SRP_LOGIN_REJ_TYPE = 0x80,
37 SRP_I_LOGOUT_TYPE = 0x03,
38 SRP_T_LOGOUT_TYPE = 0x80,
39 SRP_TSK_MGMT_TYPE = 0x01,
40 SRP_CMD_TYPE = 0x02,
41 SRP_RSP_TYPE = 0xC1,
42 SRP_CRED_REQ_TYPE = 0x81,
43 SRP_CRED_RSP_TYPE = 0x41,
44 SRP_AER_REQ_TYPE = 0x82,
45 SRP_AER_RSP_TYPE = 0x42
46};
47
48enum srp_descriptor_formats {
49 SRP_NO_BUFFER = 0x00,
50 SRP_DIRECT_BUFFER = 0x01,
51 SRP_INDIRECT_BUFFER = 0x02
52};
53
54struct memory_descriptor {
55 u64 virtual_address;
56 u32 memory_handle;
57 u32 length;
58};
59
60struct indirect_descriptor {
61 struct memory_descriptor head;
62 u32 total_length;
63 struct memory_descriptor list[1] PACKED;
64};
65
66struct srp_generic {
67 u8 type;
68 u8 reserved1[7];
69 u64 tag;
70};
71
72struct srp_login_req {
73 u8 type;
74 u8 reserved1[7];
75 u64 tag;
76 u32 max_requested_initiator_to_target_iulen;
77 u32 reserved2;
78 u16 required_buffer_formats;
79 u8 reserved3:6;
80 u8 multi_channel_action:2;
81 u8 reserved4;
82 u32 reserved5;
83 u8 initiator_port_identifier[16];
84 u8 target_port_identifier[16];
85};
86
87struct srp_login_rsp {
88 u8 type;
89 u8 reserved1[3];
90 u32 request_limit_delta;
91 u64 tag;
92 u32 max_initiator_to_target_iulen;
93 u32 max_target_to_initiator_iulen;
94 u16 supported_buffer_formats;
95 u8 reserved2:6;
96 u8 multi_channel_result:2;
97 u8 reserved3;
98 u8 reserved4[24];
99};
100
101struct srp_login_rej {
102 u8 type;
103 u8 reserved1[3];
104 u32 reason;
105 u64 tag;
106 u64 reserved2;
107 u16 supported_buffer_formats;
108 u8 reserved3[6];
109};
110
111struct srp_i_logout {
112 u8 type;
113 u8 reserved1[7];
114 u64 tag;
115};
116
117struct srp_t_logout {
118 u8 type;
119 u8 reserved1[3];
120 u32 reason;
121 u64 tag;
122};
123
124struct srp_tsk_mgmt {
125 u8 type;
126 u8 reserved1[7];
127 u64 tag;
128 u32 reserved2;
129 u64 lun PACKED;
130 u8 reserved3;
131 u8 reserved4;
132 u8 task_mgmt_flags;
133 u8 reserved5;
134 u64 managed_task_tag;
135 u64 reserved6;
136};
137
138struct srp_cmd {
139 u8 type;
140 u32 reserved1 PACKED;
141 u8 data_out_format:4;
142 u8 data_in_format:4;
143 u8 data_out_count;
144 u8 data_in_count;
145 u64 tag;
146 u32 reserved2;
147 u64 lun PACKED;
148 u8 reserved3;
149 u8 reserved4:5;
150 u8 task_attribute:3;
151 u8 reserved5;
152 u8 additional_cdb_len;
153 u8 cdb[16];
154 u8 additional_data[0x100 - 0x30];
155};
156
157struct srp_rsp {
158 u8 type;
159 u8 reserved1[3];
160 u32 request_limit_delta;
161 u64 tag;
162 u16 reserved2;
163 u8 reserved3:2;
164 u8 diunder:1;
165 u8 diover:1;
166 u8 dounder:1;
167 u8 doover:1;
168 u8 snsvalid:1;
169 u8 rspvalid:1;
170 u8 status;
171 u32 data_in_residual_count;
172 u32 data_out_residual_count;
173 u32 sense_data_list_length;
174 u32 response_data_list_length;
175 u8 sense_and_response_data[18];
176};
177
178struct srp_cred_req {
179 u8 type;
180 u8 reserved1[3];
181 u32 request_limit_delta;
182 u64 tag;
183};
184
185struct srp_cred_rsp {
186 u8 type;
187 u8 reserved1[7];
188 u64 tag;
189};
190
191struct srp_aer_req {
192 u8 type;
193 u8 reserved1[3];
194 u32 request_limit_delta;
195 u64 tag;
196 u32 reserved2;
197 u64 lun;
198 u32 sense_data_list_length;
199 u32 reserved3;
200 u8 sense_data[20];
201};
202
203struct srp_aer_rsp {
204 u8 type;
205 u8 reserved1[7];
206 u64 tag;
207};
208
209union srp_iu {
210 struct srp_generic generic;
211 struct srp_login_req login_req;
212 struct srp_login_rsp login_rsp;
213 struct srp_login_rej login_rej;
214 struct srp_i_logout i_logout;
215 struct srp_t_logout t_logout;
216 struct srp_tsk_mgmt tsk_mgmt;
217 struct srp_cmd cmd;
218 struct srp_rsp rsp;
219 struct srp_cred_req cred_req;
220 struct srp_cred_rsp cred_rsp;
221 struct srp_aer_req aer_req;
222 struct srp_aer_rsp aer_rsp;
223};
224
225#endif
diff --git a/drivers/scsi/ibmvscsi/viosrp.h b/drivers/scsi/ibmvscsi/viosrp.h
new file mode 100644
index 000000000000..6a6bba8a2f34
--- /dev/null
+++ b/drivers/scsi/ibmvscsi/viosrp.h
@@ -0,0 +1,126 @@
1/*****************************************************************************/
2/* srp.h -- SCSI RDMA Protocol definitions */
3/* */
4/* Written By: Colin Devilbis, IBM Corporation */
5/* */
6/* Copyright (C) 2003 IBM Corporation */
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 USA */
21/* */
22/* */
23/* This file contains structures and definitions for IBM RPA (RS/6000 */
24/* platform architecture) implementation of the SRP (SCSI RDMA Protocol) */
25/* standard. SRP is used on IBM iSeries and pSeries platforms to send SCSI */
26/* commands between logical partitions. */
27/* */
28/* SRP Information Units (IUs) are sent on a "Command/Response Queue" (CRQ) */
29/* between partitions. The definitions in this file are architected, */
30/* and cannot be changed without breaking compatibility with other versions */
31/* of Linux and other operating systems (AIX, OS/400) that talk this protocol*/
32/* between logical partitions */
33/*****************************************************************************/
34#ifndef VIOSRP_H
35#define VIOSRP_H
36#include "srp.h"
37
38enum viosrp_crq_formats {
39 VIOSRP_SRP_FORMAT = 0x01,
40 VIOSRP_MAD_FORMAT = 0x02,
41 VIOSRP_OS400_FORMAT = 0x03,
42 VIOSRP_AIX_FORMAT = 0x04,
43 VIOSRP_LINUX_FORMAT = 0x06,
44 VIOSRP_INLINE_FORMAT = 0x07
45};
46
47struct viosrp_crq {
48 u8 valid; /* used by RPA */
49 u8 format; /* SCSI vs out-of-band */
50 u8 reserved;
51 u8 status; /* non-scsi failure? (e.g. DMA failure) */
52 u16 timeout; /* in seconds */
53 u16 IU_length; /* in bytes */
54 u64 IU_data_ptr; /* the TCE for transferring data */
55};
56
57/* MADs are Management requests above and beyond the IUs defined in the SRP
58 * standard.
59 */
60enum viosrp_mad_types {
61 VIOSRP_EMPTY_IU_TYPE = 0x01,
62 VIOSRP_ERROR_LOG_TYPE = 0x02,
63 VIOSRP_ADAPTER_INFO_TYPE = 0x03,
64 VIOSRP_HOST_CONFIG_TYPE = 0x04
65};
66
67/*
68 * Common MAD header
69 */
70struct mad_common {
71 u32 type;
72 u16 status;
73 u16 length;
74 u64 tag;
75};
76
77/*
78 * All SRP (and MAD) requests normally flow from the
79 * client to the server. There is no way for the server to send
80 * an asynchronous message back to the client. The Empty IU is used
81 * to hang out a meaningless request to the server so that it can respond
82 * asynchrouously with something like a SCSI AER
83 */
84struct viosrp_empty_iu {
85 struct mad_common common;
86 u64 buffer;
87 u32 port;
88};
89
90struct viosrp_error_log {
91 struct mad_common common;
92 u64 buffer;
93};
94
95struct viosrp_adapter_info {
96 struct mad_common common;
97 u64 buffer;
98};
99
100struct viosrp_host_config {
101 struct mad_common common;
102 u64 buffer;
103};
104
105union mad_iu {
106 struct viosrp_empty_iu empty_iu;
107 struct viosrp_error_log error_log;
108 struct viosrp_adapter_info adapter_info;
109 struct viosrp_host_config host_config;
110};
111
112union viosrp_iu {
113 union srp_iu srp;
114 union mad_iu mad;
115};
116
117struct mad_adapter_info_data {
118 char srp_version[8];
119 char partition_name[96];
120 u32 partition_number;
121 u32 mad_version;
122 u32 os_type;
123 u32 port_max_txu[8]; /* per-port maximum transfer */
124};
125
126#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-09 16:23:50 -0400