Merge branch 'linux-next' of git://git.infradead.org/ubi-2.6
[pandora-kernel.git] / drivers / scsi / ibmvscsi / ibmvscsi.c
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-robin fashion,
44  * turns on the high order bit of the message (the valid bit), and 
45  * generates an interrupt to the receiver (if interrupts are turned on.) 
46  * The receiver just turns off the valid bit when they have copied out
47  * the message.
48  *
49  * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit
50  * (IU) (as defined in the T10 standard available at www.t10.org), gets 
51  * a DMA address for the message, and sends it to the server as the
52  * payload of a CRQ message.  The server DMAs the SRP IU and processes it,
53  * including doing any additional data transfers.  When it is done, it
54  * DMAs the SRP response back to the same address as the request came from,
55  * and sends a CRQ message back to inform the client that the request has
56  * completed.
57  *
58  * Note that some of the underlying infrastructure is different between
59  * machines conforming to the "RS/6000 Platform Architecture" (RPA) and
60  * the older iSeries hypervisor models.  To support both, some low level
61  * routines have been broken out into rpa_vscsi.c and iseries_vscsi.c.
62  * The Makefile should pick one, not two, not zero, of these.
63  *
64  * TODO: This is currently pretty tied to the IBM i/pSeries hypervisor
65  * interfaces.  It would be really nice to abstract this above an RDMA
66  * layer.
67  */
68
69 #include <linux/module.h>
70 #include <linux/moduleparam.h>
71 #include <linux/dma-mapping.h>
72 #include <linux/delay.h>
73 #include <linux/slab.h>
74 #include <linux/of.h>
75 #include <linux/pm.h>
76 #include <linux/kthread.h>
77 #include <asm/firmware.h>
78 #include <asm/vio.h>
79 #include <scsi/scsi.h>
80 #include <scsi/scsi_cmnd.h>
81 #include <scsi/scsi_host.h>
82 #include <scsi/scsi_device.h>
83 #include <scsi/scsi_transport_srp.h>
84 #include "ibmvscsi.h"
85
86 /* The values below are somewhat arbitrary default values, but 
87  * OS/400 will use 3 busses (disks, CDs, tapes, I think.)
88  * Note that there are 3 bits of channel value, 6 bits of id, and
89  * 5 bits of LUN.
90  */
91 static int max_id = 64;
92 static int max_channel = 3;
93 static int init_timeout = 300;
94 static int login_timeout = 60;
95 static int info_timeout = 30;
96 static int abort_timeout = 60;
97 static int reset_timeout = 60;
98 static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
99 static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2;
100 static int fast_fail = 1;
101 static int client_reserve = 1;
102
103 static struct scsi_transport_template *ibmvscsi_transport_template;
104
105 #define IBMVSCSI_VERSION "1.5.9"
106
107 static struct ibmvscsi_ops *ibmvscsi_ops;
108
109 MODULE_DESCRIPTION("IBM Virtual SCSI");
110 MODULE_AUTHOR("Dave Boutcher");
111 MODULE_LICENSE("GPL");
112 MODULE_VERSION(IBMVSCSI_VERSION);
113
114 module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
115 MODULE_PARM_DESC(max_id, "Largest ID value for each channel");
116 module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
117 MODULE_PARM_DESC(max_channel, "Largest channel value");
118 module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
119 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
120 module_param_named(max_requests, max_requests, int, S_IRUGO);
121 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
122 module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR);
123 MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]");
124 module_param_named(client_reserve, client_reserve, int, S_IRUGO );
125 MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release");
126
127 /* ------------------------------------------------------------
128  * Routines for the event pool and event structs
129  */
130 /**
131  * initialize_event_pool: - Allocates and initializes the event pool for a host
132  * @pool:       event_pool to be initialized
133  * @size:       Number of events in pool
134  * @hostdata:   ibmvscsi_host_data who owns the event pool
135  *
136  * Returns zero on success.
137 */
138 static int initialize_event_pool(struct event_pool *pool,
139                                  int size, struct ibmvscsi_host_data *hostdata)
140 {
141         int i;
142
143         pool->size = size;
144         pool->next = 0;
145         pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
146         if (!pool->events)
147                 return -ENOMEM;
148
149         pool->iu_storage =
150             dma_alloc_coherent(hostdata->dev,
151                                pool->size * sizeof(*pool->iu_storage),
152                                &pool->iu_token, 0);
153         if (!pool->iu_storage) {
154                 kfree(pool->events);
155                 return -ENOMEM;
156         }
157
158         for (i = 0; i < pool->size; ++i) {
159                 struct srp_event_struct *evt = &pool->events[i];
160                 memset(&evt->crq, 0x00, sizeof(evt->crq));
161                 atomic_set(&evt->free, 1);
162                 evt->crq.valid = 0x80;
163                 evt->crq.IU_length = sizeof(*evt->xfer_iu);
164                 evt->crq.IU_data_ptr = pool->iu_token + 
165                         sizeof(*evt->xfer_iu) * i;
166                 evt->xfer_iu = pool->iu_storage + i;
167                 evt->hostdata = hostdata;
168                 evt->ext_list = NULL;
169                 evt->ext_list_token = 0;
170         }
171
172         return 0;
173 }
174
175 /**
176  * release_event_pool: - Frees memory of an event pool of a host
177  * @pool:       event_pool to be released
178  * @hostdata:   ibmvscsi_host_data who owns the even pool
179  *
180  * Returns zero on success.
181 */
182 static void release_event_pool(struct event_pool *pool,
183                                struct ibmvscsi_host_data *hostdata)
184 {
185         int i, in_use = 0;
186         for (i = 0; i < pool->size; ++i) {
187                 if (atomic_read(&pool->events[i].free) != 1)
188                         ++in_use;
189                 if (pool->events[i].ext_list) {
190                         dma_free_coherent(hostdata->dev,
191                                   SG_ALL * sizeof(struct srp_direct_buf),
192                                   pool->events[i].ext_list,
193                                   pool->events[i].ext_list_token);
194                 }
195         }
196         if (in_use)
197                 dev_warn(hostdata->dev, "releasing event pool with %d "
198                          "events still in use?\n", in_use);
199         kfree(pool->events);
200         dma_free_coherent(hostdata->dev,
201                           pool->size * sizeof(*pool->iu_storage),
202                           pool->iu_storage, pool->iu_token);
203 }
204
205 /**
206  * valid_event_struct: - Determines if event is valid.
207  * @pool:       event_pool that contains the event
208  * @evt:        srp_event_struct to be checked for validity
209  *
210  * Returns zero if event is invalid, one otherwise.
211 */
212 static int valid_event_struct(struct event_pool *pool,
213                                 struct srp_event_struct *evt)
214 {
215         int index = evt - pool->events;
216         if (index < 0 || index >= pool->size)   /* outside of bounds */
217                 return 0;
218         if (evt != pool->events + index)        /* unaligned */
219                 return 0;
220         return 1;
221 }
222
223 /**
224  * ibmvscsi_free-event_struct: - Changes status of event to "free"
225  * @pool:       event_pool that contains the event
226  * @evt:        srp_event_struct to be modified
227  *
228 */
229 static void free_event_struct(struct event_pool *pool,
230                                        struct srp_event_struct *evt)
231 {
232         if (!valid_event_struct(pool, evt)) {
233                 dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p "
234                         "(not in pool %p)\n", evt, pool->events);
235                 return;
236         }
237         if (atomic_inc_return(&evt->free) != 1) {
238                 dev_err(evt->hostdata->dev, "Freeing event_struct %p "
239                         "which is not in use!\n", evt);
240                 return;
241         }
242 }
243
244 /**
245  * get_evt_struct: - Gets the next free event in pool
246  * @pool:       event_pool that contains the events to be searched
247  *
248  * Returns the next event in "free" state, and NULL if none are free.
249  * Note that no synchronization is done here, we assume the host_lock
250  * will syncrhonze things.
251 */
252 static struct srp_event_struct *get_event_struct(struct event_pool *pool)
253 {
254         int i;
255         int poolsize = pool->size;
256         int offset = pool->next;
257
258         for (i = 0; i < poolsize; i++) {
259                 offset = (offset + 1) % poolsize;
260                 if (!atomic_dec_if_positive(&pool->events[offset].free)) {
261                         pool->next = offset;
262                         return &pool->events[offset];
263                 }
264         }
265
266         printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
267         return NULL;
268 }
269
270 /**
271  * init_event_struct: Initialize fields in an event struct that are always 
272  *                    required.
273  * @evt:        The event
274  * @done:       Routine to call when the event is responded to
275  * @format:     SRP or MAD format
276  * @timeout:    timeout value set in the CRQ
277  */
278 static void init_event_struct(struct srp_event_struct *evt_struct,
279                               void (*done) (struct srp_event_struct *),
280                               u8 format,
281                               int timeout)
282 {
283         evt_struct->cmnd = NULL;
284         evt_struct->cmnd_done = NULL;
285         evt_struct->sync_srp = NULL;
286         evt_struct->crq.format = format;
287         evt_struct->crq.timeout = timeout;
288         evt_struct->done = done;
289 }
290
291 /* ------------------------------------------------------------
292  * Routines for receiving SCSI responses from the hosting partition
293  */
294
295 /**
296  * set_srp_direction: Set the fields in the srp related to data
297  *     direction and number of buffers based on the direction in
298  *     the scsi_cmnd and the number of buffers
299  */
300 static void set_srp_direction(struct scsi_cmnd *cmd,
301                               struct srp_cmd *srp_cmd, 
302                               int numbuf)
303 {
304         u8 fmt;
305
306         if (numbuf == 0)
307                 return;
308         
309         if (numbuf == 1)
310                 fmt = SRP_DATA_DESC_DIRECT;
311         else {
312                 fmt = SRP_DATA_DESC_INDIRECT;
313                 numbuf = min(numbuf, MAX_INDIRECT_BUFS);
314
315                 if (cmd->sc_data_direction == DMA_TO_DEVICE)
316                         srp_cmd->data_out_desc_cnt = numbuf;
317                 else
318                         srp_cmd->data_in_desc_cnt = numbuf;
319         }
320
321         if (cmd->sc_data_direction == DMA_TO_DEVICE)
322                 srp_cmd->buf_fmt = fmt << 4;
323         else
324                 srp_cmd->buf_fmt = fmt;
325 }
326
327 /**
328  * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
329  * @cmd:        srp_cmd whose additional_data member will be unmapped
330  * @dev:        device for which the memory is mapped
331  *
332 */
333 static void unmap_cmd_data(struct srp_cmd *cmd,
334                            struct srp_event_struct *evt_struct,
335                            struct device *dev)
336 {
337         u8 out_fmt, in_fmt;
338
339         out_fmt = cmd->buf_fmt >> 4;
340         in_fmt = cmd->buf_fmt & ((1U << 4) - 1);
341
342         if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)
343                 return;
344
345         if (evt_struct->cmnd)
346                 scsi_dma_unmap(evt_struct->cmnd);
347 }
348
349 static int map_sg_list(struct scsi_cmnd *cmd, int nseg,
350                        struct srp_direct_buf *md)
351 {
352         int i;
353         struct scatterlist *sg;
354         u64 total_length = 0;
355
356         scsi_for_each_sg(cmd, sg, nseg, i) {
357                 struct srp_direct_buf *descr = md + i;
358                 descr->va = sg_dma_address(sg);
359                 descr->len = sg_dma_len(sg);
360                 descr->key = 0;
361                 total_length += sg_dma_len(sg);
362         }
363         return total_length;
364 }
365
366 /**
367  * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
368  * @cmd:        Scsi_Cmnd with the scatterlist
369  * @srp_cmd:    srp_cmd that contains the memory descriptor
370  * @dev:        device for which to map dma memory
371  *
372  * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
373  * Returns 1 on success.
374 */
375 static int map_sg_data(struct scsi_cmnd *cmd,
376                        struct srp_event_struct *evt_struct,
377                        struct srp_cmd *srp_cmd, struct device *dev)
378 {
379
380         int sg_mapped;
381         u64 total_length = 0;
382         struct srp_direct_buf *data =
383                 (struct srp_direct_buf *) srp_cmd->add_data;
384         struct srp_indirect_buf *indirect =
385                 (struct srp_indirect_buf *) data;
386
387         sg_mapped = scsi_dma_map(cmd);
388         if (!sg_mapped)
389                 return 1;
390         else if (sg_mapped < 0)
391                 return 0;
392
393         set_srp_direction(cmd, srp_cmd, sg_mapped);
394
395         /* special case; we can use a single direct descriptor */
396         if (sg_mapped == 1) {
397                 map_sg_list(cmd, sg_mapped, data);
398                 return 1;
399         }
400
401         indirect->table_desc.va = 0;
402         indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf);
403         indirect->table_desc.key = 0;
404
405         if (sg_mapped <= MAX_INDIRECT_BUFS) {
406                 total_length = map_sg_list(cmd, sg_mapped,
407                                            &indirect->desc_list[0]);
408                 indirect->len = total_length;
409                 return 1;
410         }
411
412         /* get indirect table */
413         if (!evt_struct->ext_list) {
414                 evt_struct->ext_list = (struct srp_direct_buf *)
415                         dma_alloc_coherent(dev,
416                                            SG_ALL * sizeof(struct srp_direct_buf),
417                                            &evt_struct->ext_list_token, 0);
418                 if (!evt_struct->ext_list) {
419                         if (!firmware_has_feature(FW_FEATURE_CMO))
420                                 sdev_printk(KERN_ERR, cmd->device,
421                                             "Can't allocate memory "
422                                             "for indirect table\n");
423                         scsi_dma_unmap(cmd);
424                         return 0;
425                 }
426         }
427
428         total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list);
429
430         indirect->len = total_length;
431         indirect->table_desc.va = evt_struct->ext_list_token;
432         indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]);
433         memcpy(indirect->desc_list, evt_struct->ext_list,
434                MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
435         return 1;
436 }
437
438 /**
439  * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
440  * @cmd:        struct scsi_cmnd with the memory to be mapped
441  * @srp_cmd:    srp_cmd that contains the memory descriptor
442  * @dev:        dma device for which to map dma memory
443  *
444  * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds 
445  * Returns 1 on success.
446 */
447 static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
448                                 struct srp_event_struct *evt_struct,
449                                 struct srp_cmd *srp_cmd, struct device *dev)
450 {
451         switch (cmd->sc_data_direction) {
452         case DMA_FROM_DEVICE:
453         case DMA_TO_DEVICE:
454                 break;
455         case DMA_NONE:
456                 return 1;
457         case DMA_BIDIRECTIONAL:
458                 sdev_printk(KERN_ERR, cmd->device,
459                             "Can't map DMA_BIDIRECTIONAL to read/write\n");
460                 return 0;
461         default:
462                 sdev_printk(KERN_ERR, cmd->device,
463                             "Unknown data direction 0x%02x; can't map!\n",
464                             cmd->sc_data_direction);
465                 return 0;
466         }
467
468         return map_sg_data(cmd, evt_struct, srp_cmd, dev);
469 }
470
471 /**
472  * purge_requests: Our virtual adapter just shut down.  purge any sent requests
473  * @hostdata:    the adapter
474  */
475 static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
476 {
477         struct srp_event_struct *evt;
478         unsigned long flags;
479
480         spin_lock_irqsave(hostdata->host->host_lock, flags);
481         while (!list_empty(&hostdata->sent)) {
482                 evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list);
483                 list_del(&evt->list);
484                 del_timer(&evt->timer);
485
486                 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
487                 if (evt->cmnd) {
488                         evt->cmnd->result = (error_code << 16);
489                         unmap_cmd_data(&evt->iu.srp.cmd, evt,
490                                        evt->hostdata->dev);
491                         if (evt->cmnd_done)
492                                 evt->cmnd_done(evt->cmnd);
493                 } else if (evt->done)
494                         evt->done(evt);
495                 free_event_struct(&evt->hostdata->pool, evt);
496                 spin_lock_irqsave(hostdata->host->host_lock, flags);
497         }
498         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
499 }
500
501 /**
502  * ibmvscsi_reset_host - Reset the connection to the server
503  * @hostdata:   struct ibmvscsi_host_data to reset
504 */
505 static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
506 {
507         scsi_block_requests(hostdata->host);
508         atomic_set(&hostdata->request_limit, 0);
509
510         purge_requests(hostdata, DID_ERROR);
511         hostdata->reset_crq = 1;
512         wake_up(&hostdata->work_wait_q);
513 }
514
515 /**
516  * ibmvscsi_timeout - Internal command timeout handler
517  * @evt_struct: struct srp_event_struct that timed out
518  *
519  * Called when an internally generated command times out
520 */
521 static void ibmvscsi_timeout(struct srp_event_struct *evt_struct)
522 {
523         struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
524
525         dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
526                 evt_struct->iu.srp.cmd.opcode);
527
528         ibmvscsi_reset_host(hostdata);
529 }
530
531
532 /* ------------------------------------------------------------
533  * Routines for sending and receiving SRPs
534  */
535 /**
536  * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
537  * @evt_struct: evt_struct to be sent
538  * @hostdata:   ibmvscsi_host_data of host
539  * @timeout:    timeout in seconds - 0 means do not time command
540  *
541  * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
542  * Note that this routine assumes that host_lock is held for synchronization
543 */
544 static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
545                                    struct ibmvscsi_host_data *hostdata,
546                                    unsigned long timeout)
547 {
548         u64 *crq_as_u64 = (u64 *) &evt_struct->crq;
549         int request_status = 0;
550         int rc;
551         int srp_req = 0;
552
553         /* If we have exhausted our request limit, just fail this request,
554          * unless it is for a reset or abort.
555          * Note that there are rare cases involving driver generated requests 
556          * (such as task management requests) that the mid layer may think we
557          * can handle more requests (can_queue) when we actually can't
558          */
559         if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
560                 srp_req = 1;
561                 request_status =
562                         atomic_dec_if_positive(&hostdata->request_limit);
563                 /* If request limit was -1 when we started, it is now even
564                  * less than that
565                  */
566                 if (request_status < -1)
567                         goto send_error;
568                 /* Otherwise, we may have run out of requests. */
569                 /* If request limit was 0 when we started the adapter is in the
570                  * process of performing a login with the server adapter, or
571                  * we may have run out of requests.
572                  */
573                 else if (request_status == -1 &&
574                          evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
575                         goto send_busy;
576                 /* Abort and reset calls should make it through.
577                  * Nothing except abort and reset should use the last two
578                  * slots unless we had two or less to begin with.
579                  */
580                 else if (request_status < 2 &&
581                          evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
582                         /* In the case that we have less than two requests
583                          * available, check the server limit as a combination
584                          * of the request limit and the number of requests
585                          * in-flight (the size of the send list).  If the
586                          * server limit is greater than 2, return busy so
587                          * that the last two are reserved for reset and abort.
588                          */
589                         int server_limit = request_status;
590                         struct srp_event_struct *tmp_evt;
591
592                         list_for_each_entry(tmp_evt, &hostdata->sent, list) {
593                                 server_limit++;
594                         }
595
596                         if (server_limit > 2)
597                                 goto send_busy;
598                 }
599         }
600
601         /* Copy the IU into the transfer area */
602         *evt_struct->xfer_iu = evt_struct->iu;
603         evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
604
605         /* Add this to the sent list.  We need to do this 
606          * before we actually send 
607          * in case it comes back REALLY fast
608          */
609         list_add_tail(&evt_struct->list, &hostdata->sent);
610
611         init_timer(&evt_struct->timer);
612         if (timeout) {
613                 evt_struct->timer.data = (unsigned long) evt_struct;
614                 evt_struct->timer.expires = jiffies + (timeout * HZ);
615                 evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout;
616                 add_timer(&evt_struct->timer);
617         }
618
619         if ((rc =
620              ibmvscsi_ops->send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) {
621                 list_del(&evt_struct->list);
622                 del_timer(&evt_struct->timer);
623
624                 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
625                  * Firmware will send a CRQ with a transport event (0xFF) to
626                  * tell this client what has happened to the transport.  This
627                  * will be handled in ibmvscsi_handle_crq()
628                  */
629                 if (rc == H_CLOSED) {
630                         dev_warn(hostdata->dev, "send warning. "
631                                  "Receive queue closed, will retry.\n");
632                         goto send_busy;
633                 }
634                 dev_err(hostdata->dev, "send error %d\n", rc);
635                 if (srp_req)
636                         atomic_inc(&hostdata->request_limit);
637                 goto send_error;
638         }
639
640         return 0;
641
642  send_busy:
643         unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
644
645         free_event_struct(&hostdata->pool, evt_struct);
646         if (srp_req && request_status != -1)
647                 atomic_inc(&hostdata->request_limit);
648         return SCSI_MLQUEUE_HOST_BUSY;
649
650  send_error:
651         unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
652
653         if (evt_struct->cmnd != NULL) {
654                 evt_struct->cmnd->result = DID_ERROR << 16;
655                 evt_struct->cmnd_done(evt_struct->cmnd);
656         } else if (evt_struct->done)
657                 evt_struct->done(evt_struct);
658
659         free_event_struct(&hostdata->pool, evt_struct);
660         return 0;
661 }
662
663 /**
664  * handle_cmd_rsp: -  Handle responses from commands
665  * @evt_struct: srp_event_struct to be handled
666  *
667  * Used as a callback by when sending scsi cmds.
668  * Gets called by ibmvscsi_handle_crq()
669 */
670 static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
671 {
672         struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
673         struct scsi_cmnd *cmnd = evt_struct->cmnd;
674
675         if (unlikely(rsp->opcode != SRP_RSP)) {
676                 if (printk_ratelimit())
677                         dev_warn(evt_struct->hostdata->dev,
678                                  "bad SRP RSP type %d\n", rsp->opcode);
679         }
680         
681         if (cmnd) {
682                 cmnd->result |= rsp->status;
683                 if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
684                         memcpy(cmnd->sense_buffer,
685                                rsp->data,
686                                rsp->sense_data_len);
687                 unmap_cmd_data(&evt_struct->iu.srp.cmd, 
688                                evt_struct, 
689                                evt_struct->hostdata->dev);
690
691                 if (rsp->flags & SRP_RSP_FLAG_DOOVER)
692                         scsi_set_resid(cmnd, rsp->data_out_res_cnt);
693                 else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
694                         scsi_set_resid(cmnd, rsp->data_in_res_cnt);
695         }
696
697         if (evt_struct->cmnd_done)
698                 evt_struct->cmnd_done(cmnd);
699 }
700
701 /**
702  * lun_from_dev: - Returns the lun of the scsi device
703  * @dev:        struct scsi_device
704  *
705 */
706 static inline u16 lun_from_dev(struct scsi_device *dev)
707 {
708         return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
709 }
710
711 /**
712  * ibmvscsi_queue: - The queuecommand function of the scsi template 
713  * @cmd:        struct scsi_cmnd to be executed
714  * @done:       Callback function to be called when cmd is completed
715 */
716 static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd,
717                                  void (*done) (struct scsi_cmnd *))
718 {
719         struct srp_cmd *srp_cmd;
720         struct srp_event_struct *evt_struct;
721         struct srp_indirect_buf *indirect;
722         struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host);
723         u16 lun = lun_from_dev(cmnd->device);
724         u8 out_fmt, in_fmt;
725
726         cmnd->result = (DID_OK << 16);
727         evt_struct = get_event_struct(&hostdata->pool);
728         if (!evt_struct)
729                 return SCSI_MLQUEUE_HOST_BUSY;
730
731         /* Set up the actual SRP IU */
732         srp_cmd = &evt_struct->iu.srp.cmd;
733         memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
734         srp_cmd->opcode = SRP_CMD;
735         memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb));
736         srp_cmd->lun = ((u64) lun) << 48;
737
738         if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
739                 if (!firmware_has_feature(FW_FEATURE_CMO))
740                         sdev_printk(KERN_ERR, cmnd->device,
741                                     "couldn't convert cmd to srp_cmd\n");
742                 free_event_struct(&hostdata->pool, evt_struct);
743                 return SCSI_MLQUEUE_HOST_BUSY;
744         }
745
746         init_event_struct(evt_struct,
747                           handle_cmd_rsp,
748                           VIOSRP_SRP_FORMAT,
749                           cmnd->request->timeout/HZ);
750
751         evt_struct->cmnd = cmnd;
752         evt_struct->cmnd_done = done;
753
754         /* Fix up dma address of the buffer itself */
755         indirect = (struct srp_indirect_buf *) srp_cmd->add_data;
756         out_fmt = srp_cmd->buf_fmt >> 4;
757         in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);
758         if ((in_fmt == SRP_DATA_DESC_INDIRECT ||
759              out_fmt == SRP_DATA_DESC_INDIRECT) &&
760             indirect->table_desc.va == 0) {
761                 indirect->table_desc.va = evt_struct->crq.IU_data_ptr +
762                         offsetof(struct srp_cmd, add_data) +
763                         offsetof(struct srp_indirect_buf, desc_list);
764         }
765
766         return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
767 }
768
769 static DEF_SCSI_QCMD(ibmvscsi_queuecommand)
770
771 /* ------------------------------------------------------------
772  * Routines for driver initialization
773  */
774
775 /**
776  * map_persist_bufs: - Pre-map persistent data for adapter logins
777  * @hostdata:   ibmvscsi_host_data of host
778  *
779  * Map the capabilities and adapter info DMA buffers to avoid runtime failures.
780  * Return 1 on error, 0 on success.
781  */
782 static int map_persist_bufs(struct ibmvscsi_host_data *hostdata)
783 {
784
785         hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps,
786                                              sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
787
788         if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) {
789                 dev_err(hostdata->dev, "Unable to map capabilities buffer!\n");
790                 return 1;
791         }
792
793         hostdata->adapter_info_addr = dma_map_single(hostdata->dev,
794                                                      &hostdata->madapter_info,
795                                                      sizeof(hostdata->madapter_info),
796                                                      DMA_BIDIRECTIONAL);
797         if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) {
798                 dev_err(hostdata->dev, "Unable to map adapter info buffer!\n");
799                 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
800                                  sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
801                 return 1;
802         }
803
804         return 0;
805 }
806
807 /**
808  * unmap_persist_bufs: - Unmap persistent data needed for adapter logins
809  * @hostdata:   ibmvscsi_host_data of host
810  *
811  * Unmap the capabilities and adapter info DMA buffers
812  */
813 static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata)
814 {
815         dma_unmap_single(hostdata->dev, hostdata->caps_addr,
816                          sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
817
818         dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr,
819                          sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL);
820 }
821
822 /**
823  * login_rsp: - Handle response to SRP login request
824  * @evt_struct: srp_event_struct with the response
825  *
826  * Used as a "done" callback by when sending srp_login. Gets called
827  * by ibmvscsi_handle_crq()
828 */
829 static void login_rsp(struct srp_event_struct *evt_struct)
830 {
831         struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
832         switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
833         case SRP_LOGIN_RSP:     /* it worked! */
834                 break;
835         case SRP_LOGIN_REJ:     /* refused! */
836                 dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
837                          evt_struct->xfer_iu->srp.login_rej.reason);
838                 /* Login failed.  */
839                 atomic_set(&hostdata->request_limit, -1);
840                 return;
841         default:
842                 dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",
843                         evt_struct->xfer_iu->srp.login_rsp.opcode);
844                 /* Login failed.  */
845                 atomic_set(&hostdata->request_limit, -1);
846                 return;
847         }
848
849         dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
850         hostdata->client_migrated = 0;
851
852         /* Now we know what the real request-limit is.
853          * This value is set rather than added to request_limit because
854          * request_limit could have been set to -1 by this client.
855          */
856         atomic_set(&hostdata->request_limit,
857                    evt_struct->xfer_iu->srp.login_rsp.req_lim_delta);
858
859         /* If we had any pending I/Os, kick them */
860         scsi_unblock_requests(hostdata->host);
861 }
862
863 /**
864  * send_srp_login: - Sends the srp login
865  * @hostdata:   ibmvscsi_host_data of host
866  *
867  * Returns zero if successful.
868 */
869 static int send_srp_login(struct ibmvscsi_host_data *hostdata)
870 {
871         int rc;
872         unsigned long flags;
873         struct srp_login_req *login;
874         struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
875
876         BUG_ON(!evt_struct);
877         init_event_struct(evt_struct, login_rsp,
878                           VIOSRP_SRP_FORMAT, login_timeout);
879
880         login = &evt_struct->iu.srp.login_req;
881         memset(login, 0, sizeof(*login));
882         login->opcode = SRP_LOGIN_REQ;
883         login->req_it_iu_len = sizeof(union srp_iu);
884         login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT;
885
886         spin_lock_irqsave(hostdata->host->host_lock, flags);
887         /* Start out with a request limit of 0, since this is negotiated in
888          * the login request we are just sending and login requests always
889          * get sent by the driver regardless of request_limit.
890          */
891         atomic_set(&hostdata->request_limit, 0);
892
893         rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2);
894         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
895         dev_info(hostdata->dev, "sent SRP login\n");
896         return rc;
897 };
898
899 /**
900  * capabilities_rsp: - Handle response to MAD adapter capabilities request
901  * @evt_struct: srp_event_struct with the response
902  *
903  * Used as a "done" callback by when sending adapter_info.
904  */
905 static void capabilities_rsp(struct srp_event_struct *evt_struct)
906 {
907         struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
908
909         if (evt_struct->xfer_iu->mad.capabilities.common.status) {
910                 dev_err(hostdata->dev, "error 0x%X getting capabilities info\n",
911                         evt_struct->xfer_iu->mad.capabilities.common.status);
912         } else {
913                 if (hostdata->caps.migration.common.server_support != SERVER_SUPPORTS_CAP)
914                         dev_info(hostdata->dev, "Partition migration not supported\n");
915
916                 if (client_reserve) {
917                         if (hostdata->caps.reserve.common.server_support ==
918                             SERVER_SUPPORTS_CAP)
919                                 dev_info(hostdata->dev, "Client reserve enabled\n");
920                         else
921                                 dev_info(hostdata->dev, "Client reserve not supported\n");
922                 }
923         }
924
925         send_srp_login(hostdata);
926 }
927
928 /**
929  * send_mad_capabilities: - Sends the mad capabilities request
930  *      and stores the result so it can be retrieved with
931  * @hostdata:   ibmvscsi_host_data of host
932  */
933 static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata)
934 {
935         struct viosrp_capabilities *req;
936         struct srp_event_struct *evt_struct;
937         unsigned long flags;
938         struct device_node *of_node = hostdata->dev->of_node;
939         const char *location;
940
941         evt_struct = get_event_struct(&hostdata->pool);
942         BUG_ON(!evt_struct);
943
944         init_event_struct(evt_struct, capabilities_rsp,
945                           VIOSRP_MAD_FORMAT, info_timeout);
946
947         req = &evt_struct->iu.mad.capabilities;
948         memset(req, 0, sizeof(*req));
949
950         hostdata->caps.flags = CAP_LIST_SUPPORTED;
951         if (hostdata->client_migrated)
952                 hostdata->caps.flags |= CLIENT_MIGRATED;
953
954         strncpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev),
955                 sizeof(hostdata->caps.name));
956         hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0';
957
958         location = of_get_property(of_node, "ibm,loc-code", NULL);
959         location = location ? location : dev_name(hostdata->dev);
960         strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc));
961         hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0';
962
963         req->common.type = VIOSRP_CAPABILITIES_TYPE;
964         req->buffer = hostdata->caps_addr;
965
966         hostdata->caps.migration.common.cap_type = MIGRATION_CAPABILITIES;
967         hostdata->caps.migration.common.length = sizeof(hostdata->caps.migration);
968         hostdata->caps.migration.common.server_support = SERVER_SUPPORTS_CAP;
969         hostdata->caps.migration.ecl = 1;
970
971         if (client_reserve) {
972                 hostdata->caps.reserve.common.cap_type = RESERVATION_CAPABILITIES;
973                 hostdata->caps.reserve.common.length = sizeof(hostdata->caps.reserve);
974                 hostdata->caps.reserve.common.server_support = SERVER_SUPPORTS_CAP;
975                 hostdata->caps.reserve.type = CLIENT_RESERVE_SCSI_2;
976                 req->common.length = sizeof(hostdata->caps);
977         } else
978                 req->common.length = sizeof(hostdata->caps) - sizeof(hostdata->caps.reserve);
979
980         spin_lock_irqsave(hostdata->host->host_lock, flags);
981         if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
982                 dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n");
983         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
984 };
985
986 /**
987  * fast_fail_rsp: - Handle response to MAD enable fast fail
988  * @evt_struct: srp_event_struct with the response
989  *
990  * Used as a "done" callback by when sending enable fast fail. Gets called
991  * by ibmvscsi_handle_crq()
992  */
993 static void fast_fail_rsp(struct srp_event_struct *evt_struct)
994 {
995         struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
996         u8 status = evt_struct->xfer_iu->mad.fast_fail.common.status;
997
998         if (status == VIOSRP_MAD_NOT_SUPPORTED)
999                 dev_err(hostdata->dev, "fast_fail not supported in server\n");
1000         else if (status == VIOSRP_MAD_FAILED)
1001                 dev_err(hostdata->dev, "fast_fail request failed\n");
1002         else if (status != VIOSRP_MAD_SUCCESS)
1003                 dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);
1004
1005         send_mad_capabilities(hostdata);
1006 }
1007
1008 /**
1009  * init_host - Start host initialization
1010  * @hostdata:   ibmvscsi_host_data of host
1011  *
1012  * Returns zero if successful.
1013  */
1014 static int enable_fast_fail(struct ibmvscsi_host_data *hostdata)
1015 {
1016         int rc;
1017         unsigned long flags;
1018         struct viosrp_fast_fail *fast_fail_mad;
1019         struct srp_event_struct *evt_struct;
1020
1021         if (!fast_fail) {
1022                 send_mad_capabilities(hostdata);
1023                 return 0;
1024         }
1025
1026         evt_struct = get_event_struct(&hostdata->pool);
1027         BUG_ON(!evt_struct);
1028
1029         init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout);
1030
1031         fast_fail_mad = &evt_struct->iu.mad.fast_fail;
1032         memset(fast_fail_mad, 0, sizeof(*fast_fail_mad));
1033         fast_fail_mad->common.type = VIOSRP_ENABLE_FAST_FAIL;
1034         fast_fail_mad->common.length = sizeof(*fast_fail_mad);
1035
1036         spin_lock_irqsave(hostdata->host->host_lock, flags);
1037         rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
1038         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1039         return rc;
1040 }
1041
1042 /**
1043  * adapter_info_rsp: - Handle response to MAD adapter info request
1044  * @evt_struct: srp_event_struct with the response
1045  *
1046  * Used as a "done" callback by when sending adapter_info. Gets called
1047  * by ibmvscsi_handle_crq()
1048 */
1049 static void adapter_info_rsp(struct srp_event_struct *evt_struct)
1050 {
1051         struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1052
1053         if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
1054                 dev_err(hostdata->dev, "error %d getting adapter info\n",
1055                         evt_struct->xfer_iu->mad.adapter_info.common.status);
1056         } else {
1057                 dev_info(hostdata->dev, "host srp version: %s, "
1058                          "host partition %s (%d), OS %d, max io %u\n",
1059                          hostdata->madapter_info.srp_version,
1060                          hostdata->madapter_info.partition_name,
1061                          hostdata->madapter_info.partition_number,
1062                          hostdata->madapter_info.os_type,
1063                          hostdata->madapter_info.port_max_txu[0]);
1064                 
1065                 if (hostdata->madapter_info.port_max_txu[0]) 
1066                         hostdata->host->max_sectors = 
1067                                 hostdata->madapter_info.port_max_txu[0] >> 9;
1068                 
1069                 if (hostdata->madapter_info.os_type == 3 &&
1070                     strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
1071                         dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
1072                                 hostdata->madapter_info.srp_version);
1073                         dev_err(hostdata->dev, "limiting scatterlists to %d\n",
1074                                 MAX_INDIRECT_BUFS);
1075                         hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
1076                 }
1077
1078                 if (hostdata->madapter_info.os_type == 3) {
1079                         enable_fast_fail(hostdata);
1080                         return;
1081                 }
1082         }
1083
1084         send_srp_login(hostdata);
1085 }
1086
1087 /**
1088  * send_mad_adapter_info: - Sends the mad adapter info request
1089  *      and stores the result so it can be retrieved with
1090  *      sysfs.  We COULD consider causing a failure if the
1091  *      returned SRP version doesn't match ours.
1092  * @hostdata:   ibmvscsi_host_data of host
1093  * 
1094  * Returns zero if successful.
1095 */
1096 static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
1097 {
1098         struct viosrp_adapter_info *req;
1099         struct srp_event_struct *evt_struct;
1100         unsigned long flags;
1101
1102         evt_struct = get_event_struct(&hostdata->pool);
1103         BUG_ON(!evt_struct);
1104
1105         init_event_struct(evt_struct,
1106                           adapter_info_rsp,
1107                           VIOSRP_MAD_FORMAT,
1108                           info_timeout);
1109         
1110         req = &evt_struct->iu.mad.adapter_info;
1111         memset(req, 0x00, sizeof(*req));
1112         
1113         req->common.type = VIOSRP_ADAPTER_INFO_TYPE;
1114         req->common.length = sizeof(hostdata->madapter_info);
1115         req->buffer = hostdata->adapter_info_addr;
1116
1117         spin_lock_irqsave(hostdata->host->host_lock, flags);
1118         if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1119                 dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
1120         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1121 };
1122
1123 /**
1124  * init_adapter: Start virtual adapter initialization sequence
1125  *
1126  */
1127 static void init_adapter(struct ibmvscsi_host_data *hostdata)
1128 {
1129         send_mad_adapter_info(hostdata);
1130 }
1131
1132 /**
1133  * sync_completion: Signal that a synchronous command has completed
1134  * Note that after returning from this call, the evt_struct is freed.
1135  * the caller waiting on this completion shouldn't touch the evt_struct
1136  * again.
1137  */
1138 static void sync_completion(struct srp_event_struct *evt_struct)
1139 {
1140         /* copy the response back */
1141         if (evt_struct->sync_srp)
1142                 *evt_struct->sync_srp = *evt_struct->xfer_iu;
1143         
1144         complete(&evt_struct->comp);
1145 }
1146
1147 /**
1148  * ibmvscsi_abort: Abort a command...from scsi host template
1149  * send this over to the server and wait synchronously for the response
1150  */
1151 static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
1152 {
1153         struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1154         struct srp_tsk_mgmt *tsk_mgmt;
1155         struct srp_event_struct *evt;
1156         struct srp_event_struct *tmp_evt, *found_evt;
1157         union viosrp_iu srp_rsp;
1158         int rsp_rc;
1159         unsigned long flags;
1160         u16 lun = lun_from_dev(cmd->device);
1161         unsigned long wait_switch = 0;
1162
1163         /* First, find this command in our sent list so we can figure
1164          * out the correct tag
1165          */
1166         spin_lock_irqsave(hostdata->host->host_lock, flags);
1167         wait_switch = jiffies + (init_timeout * HZ);
1168         do {
1169                 found_evt = NULL;
1170                 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1171                         if (tmp_evt->cmnd == cmd) {
1172                                 found_evt = tmp_evt;
1173                                 break;
1174                         }
1175                 }
1176
1177                 if (!found_evt) {
1178                         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1179                         return SUCCESS;
1180                 }
1181
1182                 evt = get_event_struct(&hostdata->pool);
1183                 if (evt == NULL) {
1184                         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1185                         sdev_printk(KERN_ERR, cmd->device,
1186                                 "failed to allocate abort event\n");
1187                         return FAILED;
1188                 }
1189         
1190                 init_event_struct(evt,
1191                                   sync_completion,
1192                                   VIOSRP_SRP_FORMAT,
1193                                   abort_timeout);
1194
1195                 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1196         
1197                 /* Set up an abort SRP command */
1198                 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1199                 tsk_mgmt->opcode = SRP_TSK_MGMT;
1200                 tsk_mgmt->lun = ((u64) lun) << 48;
1201                 tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
1202                 tsk_mgmt->task_tag = (u64) found_evt;
1203
1204                 evt->sync_srp = &srp_rsp;
1205
1206                 init_completion(&evt->comp);
1207                 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2);
1208
1209                 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1210                         break;
1211
1212                 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1213                 msleep(10);
1214                 spin_lock_irqsave(hostdata->host->host_lock, flags);
1215         } while (time_before(jiffies, wait_switch));
1216
1217         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1218
1219         if (rsp_rc != 0) {
1220                 sdev_printk(KERN_ERR, cmd->device,
1221                             "failed to send abort() event. rc=%d\n", rsp_rc);
1222                 return FAILED;
1223         }
1224
1225         sdev_printk(KERN_INFO, cmd->device,
1226                     "aborting command. lun 0x%llx, tag 0x%llx\n",
1227                     (((u64) lun) << 48), (u64) found_evt);
1228
1229         wait_for_completion(&evt->comp);
1230
1231         /* make sure we got a good response */
1232         if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1233                 if (printk_ratelimit())
1234                         sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
1235                                     srp_rsp.srp.rsp.opcode);
1236                 return FAILED;
1237         }
1238
1239         if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1240                 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1241         else
1242                 rsp_rc = srp_rsp.srp.rsp.status;
1243
1244         if (rsp_rc) {
1245                 if (printk_ratelimit())
1246                         sdev_printk(KERN_WARNING, cmd->device,
1247                                     "abort code %d for task tag 0x%llx\n",
1248                                     rsp_rc, tsk_mgmt->task_tag);
1249                 return FAILED;
1250         }
1251
1252         /* Because we dropped the spinlock above, it's possible
1253          * The event is no longer in our list.  Make sure it didn't
1254          * complete while we were aborting
1255          */
1256         spin_lock_irqsave(hostdata->host->host_lock, flags);
1257         found_evt = NULL;
1258         list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1259                 if (tmp_evt->cmnd == cmd) {
1260                         found_evt = tmp_evt;
1261                         break;
1262                 }
1263         }
1264
1265         if (found_evt == NULL) {
1266                 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1267                 sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n",
1268                             tsk_mgmt->task_tag);
1269                 return SUCCESS;
1270         }
1271
1272         sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n",
1273                     tsk_mgmt->task_tag);
1274
1275         cmd->result = (DID_ABORT << 16);
1276         list_del(&found_evt->list);
1277         unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
1278                        found_evt->hostdata->dev);
1279         free_event_struct(&found_evt->hostdata->pool, found_evt);
1280         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1281         atomic_inc(&hostdata->request_limit);
1282         return SUCCESS;
1283 }
1284
1285 /**
1286  * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host 
1287  * template send this over to the server and wait synchronously for the 
1288  * response
1289  */
1290 static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
1291 {
1292         struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1293         struct srp_tsk_mgmt *tsk_mgmt;
1294         struct srp_event_struct *evt;
1295         struct srp_event_struct *tmp_evt, *pos;
1296         union viosrp_iu srp_rsp;
1297         int rsp_rc;
1298         unsigned long flags;
1299         u16 lun = lun_from_dev(cmd->device);
1300         unsigned long wait_switch = 0;
1301
1302         spin_lock_irqsave(hostdata->host->host_lock, flags);
1303         wait_switch = jiffies + (init_timeout * HZ);
1304         do {
1305                 evt = get_event_struct(&hostdata->pool);
1306                 if (evt == NULL) {
1307                         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1308                         sdev_printk(KERN_ERR, cmd->device,
1309                                 "failed to allocate reset event\n");
1310                         return FAILED;
1311                 }
1312         
1313                 init_event_struct(evt,
1314                                   sync_completion,
1315                                   VIOSRP_SRP_FORMAT,
1316                                   reset_timeout);
1317
1318                 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1319
1320                 /* Set up a lun reset SRP command */
1321                 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1322                 tsk_mgmt->opcode = SRP_TSK_MGMT;
1323                 tsk_mgmt->lun = ((u64) lun) << 48;
1324                 tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
1325
1326                 evt->sync_srp = &srp_rsp;
1327
1328                 init_completion(&evt->comp);
1329                 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2);
1330
1331                 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1332                         break;
1333
1334                 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1335                 msleep(10);
1336                 spin_lock_irqsave(hostdata->host->host_lock, flags);
1337         } while (time_before(jiffies, wait_switch));
1338
1339         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1340
1341         if (rsp_rc != 0) {
1342                 sdev_printk(KERN_ERR, cmd->device,
1343                             "failed to send reset event. rc=%d\n", rsp_rc);
1344                 return FAILED;
1345         }
1346
1347         sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n",
1348                     (((u64) lun) << 48));
1349
1350         wait_for_completion(&evt->comp);
1351
1352         /* make sure we got a good response */
1353         if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1354                 if (printk_ratelimit())
1355                         sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
1356                                     srp_rsp.srp.rsp.opcode);
1357                 return FAILED;
1358         }
1359
1360         if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1361                 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1362         else
1363                 rsp_rc = srp_rsp.srp.rsp.status;
1364
1365         if (rsp_rc) {
1366                 if (printk_ratelimit())
1367                         sdev_printk(KERN_WARNING, cmd->device,
1368                                     "reset code %d for task tag 0x%llx\n",
1369                                     rsp_rc, tsk_mgmt->task_tag);
1370                 return FAILED;
1371         }
1372
1373         /* We need to find all commands for this LUN that have not yet been
1374          * responded to, and fail them with DID_RESET
1375          */
1376         spin_lock_irqsave(hostdata->host->host_lock, flags);
1377         list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1378                 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1379                         if (tmp_evt->cmnd)
1380                                 tmp_evt->cmnd->result = (DID_RESET << 16);
1381                         list_del(&tmp_evt->list);
1382                         unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
1383                                        tmp_evt->hostdata->dev);
1384                         free_event_struct(&tmp_evt->hostdata->pool,
1385                                                    tmp_evt);
1386                         atomic_inc(&hostdata->request_limit);
1387                         if (tmp_evt->cmnd_done)
1388                                 tmp_evt->cmnd_done(tmp_evt->cmnd);
1389                         else if (tmp_evt->done)
1390                                 tmp_evt->done(tmp_evt);
1391                 }
1392         }
1393         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1394         return SUCCESS;
1395 }
1396
1397 /**
1398  * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1399  * @cmd:        struct scsi_cmnd having problems
1400 */
1401 static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
1402 {
1403         unsigned long wait_switch = 0;
1404         struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1405
1406         dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
1407
1408         ibmvscsi_reset_host(hostdata);
1409
1410         for (wait_switch = jiffies + (init_timeout * HZ);
1411              time_before(jiffies, wait_switch) &&
1412                      atomic_read(&hostdata->request_limit) < 2;) {
1413
1414                 msleep(10);
1415         }
1416
1417         if (atomic_read(&hostdata->request_limit) <= 0)
1418                 return FAILED;
1419
1420         return SUCCESS;
1421 }
1422
1423 /**
1424  * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1425  * @crq:        Command/Response queue
1426  * @hostdata:   ibmvscsi_host_data of host
1427  *
1428 */
1429 void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1430                          struct ibmvscsi_host_data *hostdata)
1431 {
1432         long rc;
1433         unsigned long flags;
1434         struct srp_event_struct *evt_struct =
1435             (struct srp_event_struct *)crq->IU_data_ptr;
1436         switch (crq->valid) {
1437         case 0xC0:              /* initialization */
1438                 switch (crq->format) {
1439                 case 0x01:      /* Initialization message */
1440                         dev_info(hostdata->dev, "partner initialized\n");
1441                         /* Send back a response */
1442                         if ((rc = ibmvscsi_ops->send_crq(hostdata,
1443                                                          0xC002000000000000LL, 0)) == 0) {
1444                                 /* Now login */
1445                                 init_adapter(hostdata);
1446                         } else {
1447                                 dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
1448                         }
1449
1450                         break;
1451                 case 0x02:      /* Initialization response */
1452                         dev_info(hostdata->dev, "partner initialization complete\n");
1453
1454                         /* Now login */
1455                         init_adapter(hostdata);
1456                         break;
1457                 default:
1458                         dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
1459                 }
1460                 return;
1461         case 0xFF:      /* Hypervisor telling us the connection is closed */
1462                 scsi_block_requests(hostdata->host);
1463                 atomic_set(&hostdata->request_limit, 0);
1464                 if (crq->format == 0x06) {
1465                         /* We need to re-setup the interpartition connection */
1466                         dev_info(hostdata->dev, "Re-enabling adapter!\n");
1467                         hostdata->client_migrated = 1;
1468                         hostdata->reenable_crq = 1;
1469                         purge_requests(hostdata, DID_REQUEUE);
1470                         wake_up(&hostdata->work_wait_q);
1471                 } else {
1472                         dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",
1473                                 crq->format);
1474                         ibmvscsi_reset_host(hostdata);
1475                 }
1476                 return;
1477         case 0x80:              /* real payload */
1478                 break;
1479         default:
1480                 dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
1481                         crq->valid);
1482                 return;
1483         }
1484
1485         /* The only kind of payload CRQs we should get are responses to
1486          * things we send. Make sure this response is to something we
1487          * actually sent
1488          */
1489         if (!valid_event_struct(&hostdata->pool, evt_struct)) {
1490                 dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
1491                        (void *)crq->IU_data_ptr);
1492                 return;
1493         }
1494
1495         if (atomic_read(&evt_struct->free)) {
1496                 dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
1497                         (void *)crq->IU_data_ptr);
1498                 return;
1499         }
1500
1501         if (crq->format == VIOSRP_SRP_FORMAT)
1502                 atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta,
1503                            &hostdata->request_limit);
1504
1505         del_timer(&evt_struct->timer);
1506
1507         if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd)
1508                 evt_struct->cmnd->result = DID_ERROR << 16;
1509         if (evt_struct->done)
1510                 evt_struct->done(evt_struct);
1511         else
1512                 dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
1513
1514         /*
1515          * Lock the host_lock before messing with these structures, since we
1516          * are running in a task context
1517          */
1518         spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1519         list_del(&evt_struct->list);
1520         free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1521         spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1522 }
1523
1524 /**
1525  * ibmvscsi_get_host_config: Send the command to the server to get host
1526  * configuration data.  The data is opaque to us.
1527  */
1528 static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata,
1529                                    unsigned char *buffer, int length)
1530 {
1531         struct viosrp_host_config *host_config;
1532         struct srp_event_struct *evt_struct;
1533         unsigned long flags;
1534         dma_addr_t addr;
1535         int rc;
1536
1537         evt_struct = get_event_struct(&hostdata->pool);
1538         if (!evt_struct) {
1539                 dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n");
1540                 return -1;
1541         }
1542
1543         init_event_struct(evt_struct,
1544                           sync_completion,
1545                           VIOSRP_MAD_FORMAT,
1546                           info_timeout);
1547
1548         host_config = &evt_struct->iu.mad.host_config;
1549
1550         /* Set up a lun reset SRP command */
1551         memset(host_config, 0x00, sizeof(*host_config));
1552         host_config->common.type = VIOSRP_HOST_CONFIG_TYPE;
1553         host_config->common.length = length;
1554         host_config->buffer = addr = dma_map_single(hostdata->dev, buffer,
1555                                                     length,
1556                                                     DMA_BIDIRECTIONAL);
1557
1558         if (dma_mapping_error(hostdata->dev, host_config->buffer)) {
1559                 if (!firmware_has_feature(FW_FEATURE_CMO))
1560                         dev_err(hostdata->dev,
1561                                 "dma_mapping error getting host config\n");
1562                 free_event_struct(&hostdata->pool, evt_struct);
1563                 return -1;
1564         }
1565
1566         init_completion(&evt_struct->comp);
1567         spin_lock_irqsave(hostdata->host->host_lock, flags);
1568         rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
1569         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1570         if (rc == 0)
1571                 wait_for_completion(&evt_struct->comp);
1572         dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL);
1573
1574         return rc;
1575 }
1576
1577 /**
1578  * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1579  * @sdev:       struct scsi_device device to configure
1580  *
1581  * Enable allow_restart for a device if it is a disk.  Adjust the
1582  * queue_depth here also as is required by the documentation for
1583  * struct scsi_host_template.
1584  */
1585 static int ibmvscsi_slave_configure(struct scsi_device *sdev)
1586 {
1587         struct Scsi_Host *shost = sdev->host;
1588         unsigned long lock_flags = 0;
1589
1590         spin_lock_irqsave(shost->host_lock, lock_flags);
1591         if (sdev->type == TYPE_DISK) {
1592                 sdev->allow_restart = 1;
1593                 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
1594         }
1595         scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun);
1596         spin_unlock_irqrestore(shost->host_lock, lock_flags);
1597         return 0;
1598 }
1599
1600 /**
1601  * ibmvscsi_change_queue_depth - Change the device's queue depth
1602  * @sdev:       scsi device struct
1603  * @qdepth:     depth to set
1604  * @reason:     calling context
1605  *
1606  * Return value:
1607  *      actual depth set
1608  **/
1609 static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth,
1610                                        int reason)
1611 {
1612         if (reason != SCSI_QDEPTH_DEFAULT)
1613                 return -EOPNOTSUPP;
1614
1615         if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
1616                 qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
1617
1618         scsi_adjust_queue_depth(sdev, 0, qdepth);
1619         return sdev->queue_depth;
1620 }
1621
1622 /* ------------------------------------------------------------
1623  * sysfs attributes
1624  */
1625 static ssize_t show_host_vhost_loc(struct device *dev,
1626                                    struct device_attribute *attr, char *buf)
1627 {
1628         struct Scsi_Host *shost = class_to_shost(dev);
1629         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1630         int len;
1631
1632         len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n",
1633                        hostdata->caps.loc);
1634         return len;
1635 }
1636
1637 static struct device_attribute ibmvscsi_host_vhost_loc = {
1638         .attr = {
1639                  .name = "vhost_loc",
1640                  .mode = S_IRUGO,
1641                  },
1642         .show = show_host_vhost_loc,
1643 };
1644
1645 static ssize_t show_host_vhost_name(struct device *dev,
1646                                     struct device_attribute *attr, char *buf)
1647 {
1648         struct Scsi_Host *shost = class_to_shost(dev);
1649         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1650         int len;
1651
1652         len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n",
1653                        hostdata->caps.name);
1654         return len;
1655 }
1656
1657 static struct device_attribute ibmvscsi_host_vhost_name = {
1658         .attr = {
1659                  .name = "vhost_name",
1660                  .mode = S_IRUGO,
1661                  },
1662         .show = show_host_vhost_name,
1663 };
1664
1665 static ssize_t show_host_srp_version(struct device *dev,
1666                                      struct device_attribute *attr, char *buf)
1667 {
1668         struct Scsi_Host *shost = class_to_shost(dev);
1669         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1670         int len;
1671
1672         len = snprintf(buf, PAGE_SIZE, "%s\n",
1673                        hostdata->madapter_info.srp_version);
1674         return len;
1675 }
1676
1677 static struct device_attribute ibmvscsi_host_srp_version = {
1678         .attr = {
1679                  .name = "srp_version",
1680                  .mode = S_IRUGO,
1681                  },
1682         .show = show_host_srp_version,
1683 };
1684
1685 static ssize_t show_host_partition_name(struct device *dev,
1686                                         struct device_attribute *attr,
1687                                         char *buf)
1688 {
1689         struct Scsi_Host *shost = class_to_shost(dev);
1690         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1691         int len;
1692
1693         len = snprintf(buf, PAGE_SIZE, "%s\n",
1694                        hostdata->madapter_info.partition_name);
1695         return len;
1696 }
1697
1698 static struct device_attribute ibmvscsi_host_partition_name = {
1699         .attr = {
1700                  .name = "partition_name",
1701                  .mode = S_IRUGO,
1702                  },
1703         .show = show_host_partition_name,
1704 };
1705
1706 static ssize_t show_host_partition_number(struct device *dev,
1707                                           struct device_attribute *attr,
1708                                           char *buf)
1709 {
1710         struct Scsi_Host *shost = class_to_shost(dev);
1711         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1712         int len;
1713
1714         len = snprintf(buf, PAGE_SIZE, "%d\n",
1715                        hostdata->madapter_info.partition_number);
1716         return len;
1717 }
1718
1719 static struct device_attribute ibmvscsi_host_partition_number = {
1720         .attr = {
1721                  .name = "partition_number",
1722                  .mode = S_IRUGO,
1723                  },
1724         .show = show_host_partition_number,
1725 };
1726
1727 static ssize_t show_host_mad_version(struct device *dev,
1728                                      struct device_attribute *attr, char *buf)
1729 {
1730         struct Scsi_Host *shost = class_to_shost(dev);
1731         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1732         int len;
1733
1734         len = snprintf(buf, PAGE_SIZE, "%d\n",
1735                        hostdata->madapter_info.mad_version);
1736         return len;
1737 }
1738
1739 static struct device_attribute ibmvscsi_host_mad_version = {
1740         .attr = {
1741                  .name = "mad_version",
1742                  .mode = S_IRUGO,
1743                  },
1744         .show = show_host_mad_version,
1745 };
1746
1747 static ssize_t show_host_os_type(struct device *dev,
1748                                  struct device_attribute *attr, char *buf)
1749 {
1750         struct Scsi_Host *shost = class_to_shost(dev);
1751         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1752         int len;
1753
1754         len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type);
1755         return len;
1756 }
1757
1758 static struct device_attribute ibmvscsi_host_os_type = {
1759         .attr = {
1760                  .name = "os_type",
1761                  .mode = S_IRUGO,
1762                  },
1763         .show = show_host_os_type,
1764 };
1765
1766 static ssize_t show_host_config(struct device *dev,
1767                                 struct device_attribute *attr, char *buf)
1768 {
1769         struct Scsi_Host *shost = class_to_shost(dev);
1770         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1771
1772         /* returns null-terminated host config data */
1773         if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0)
1774                 return strlen(buf);
1775         else
1776                 return 0;
1777 }
1778
1779 static struct device_attribute ibmvscsi_host_config = {
1780         .attr = {
1781                  .name = "config",
1782                  .mode = S_IRUGO,
1783                  },
1784         .show = show_host_config,
1785 };
1786
1787 static struct device_attribute *ibmvscsi_attrs[] = {
1788         &ibmvscsi_host_vhost_loc,
1789         &ibmvscsi_host_vhost_name,
1790         &ibmvscsi_host_srp_version,
1791         &ibmvscsi_host_partition_name,
1792         &ibmvscsi_host_partition_number,
1793         &ibmvscsi_host_mad_version,
1794         &ibmvscsi_host_os_type,
1795         &ibmvscsi_host_config,
1796         NULL
1797 };
1798
1799 /* ------------------------------------------------------------
1800  * SCSI driver registration
1801  */
1802 static struct scsi_host_template driver_template = {
1803         .module = THIS_MODULE,
1804         .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
1805         .proc_name = "ibmvscsi",
1806         .queuecommand = ibmvscsi_queuecommand,
1807         .eh_abort_handler = ibmvscsi_eh_abort_handler,
1808         .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
1809         .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
1810         .slave_configure = ibmvscsi_slave_configure,
1811         .change_queue_depth = ibmvscsi_change_queue_depth,
1812         .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT,
1813         .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
1814         .this_id = -1,
1815         .sg_tablesize = SG_ALL,
1816         .use_clustering = ENABLE_CLUSTERING,
1817         .shost_attrs = ibmvscsi_attrs,
1818 };
1819
1820 /**
1821  * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver
1822  *
1823  * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1824  *
1825  * Return value:
1826  *      Number of bytes of IO data the driver will need to perform well.
1827  */
1828 static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev)
1829 {
1830         /* iu_storage data allocated in initialize_event_pool */
1831         unsigned long desired_io = max_events * sizeof(union viosrp_iu);
1832
1833         /* add io space for sg data */
1834         desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 *
1835                              IBMVSCSI_CMDS_PER_LUN_DEFAULT);
1836
1837         return desired_io;
1838 }
1839
1840 static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata)
1841 {
1842         int rc;
1843         char *action = "reset";
1844
1845         if (hostdata->reset_crq) {
1846                 smp_rmb();
1847                 hostdata->reset_crq = 0;
1848
1849                 rc = ibmvscsi_ops->reset_crq_queue(&hostdata->queue, hostdata);
1850                 if (!rc)
1851                         rc = ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0);
1852                 vio_enable_interrupts(to_vio_dev(hostdata->dev));
1853         } else if (hostdata->reenable_crq) {
1854                 smp_rmb();
1855                 action = "enable";
1856                 rc = ibmvscsi_ops->reenable_crq_queue(&hostdata->queue, hostdata);
1857                 hostdata->reenable_crq = 0;
1858                 if (!rc)
1859                         rc = ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0);
1860         } else
1861                 return;
1862
1863         if (rc) {
1864                 atomic_set(&hostdata->request_limit, -1);
1865                 dev_err(hostdata->dev, "error after %s\n", action);
1866         }
1867
1868         scsi_unblock_requests(hostdata->host);
1869 }
1870
1871 static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
1872 {
1873         if (kthread_should_stop())
1874                 return 1;
1875         else if (hostdata->reset_crq) {
1876                 smp_rmb();
1877                 return 1;
1878         } else if (hostdata->reenable_crq) {
1879                 smp_rmb();
1880                 return 1;
1881         }
1882
1883         return 0;
1884 }
1885
1886 static int ibmvscsi_work(void *data)
1887 {
1888         struct ibmvscsi_host_data *hostdata = data;
1889         int rc;
1890
1891         set_user_nice(current, -20);
1892
1893         while (1) {
1894                 rc = wait_event_interruptible(hostdata->work_wait_q,
1895                                               ibmvscsi_work_to_do(hostdata));
1896
1897                 BUG_ON(rc);
1898
1899                 if (kthread_should_stop())
1900                         break;
1901
1902                 ibmvscsi_do_work(hostdata);
1903         }
1904
1905         return 0;
1906 }
1907
1908 /**
1909  * Called by bus code for each adapter
1910  */
1911 static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1912 {
1913         struct ibmvscsi_host_data *hostdata;
1914         struct Scsi_Host *host;
1915         struct device *dev = &vdev->dev;
1916         struct srp_rport_identifiers ids;
1917         struct srp_rport *rport;
1918         unsigned long wait_switch = 0;
1919         int rc;
1920
1921         dev_set_drvdata(&vdev->dev, NULL);
1922
1923         host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
1924         if (!host) {
1925                 dev_err(&vdev->dev, "couldn't allocate host data\n");
1926                 goto scsi_host_alloc_failed;
1927         }
1928
1929         host->transportt = ibmvscsi_transport_template;
1930         hostdata = shost_priv(host);
1931         memset(hostdata, 0x00, sizeof(*hostdata));
1932         INIT_LIST_HEAD(&hostdata->sent);
1933         init_waitqueue_head(&hostdata->work_wait_q);
1934         hostdata->host = host;
1935         hostdata->dev = dev;
1936         atomic_set(&hostdata->request_limit, -1);
1937         hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT;
1938
1939         if (map_persist_bufs(hostdata)) {
1940                 dev_err(&vdev->dev, "couldn't map persistent buffers\n");
1941                 goto persist_bufs_failed;
1942         }
1943
1944         hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d",
1945                                             "ibmvscsi", host->host_no);
1946
1947         if (IS_ERR(hostdata->work_thread)) {
1948                 dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n",
1949                         PTR_ERR(hostdata->work_thread));
1950                 goto init_crq_failed;
1951         }
1952
1953         rc = ibmvscsi_ops->init_crq_queue(&hostdata->queue, hostdata, max_events);
1954         if (rc != 0 && rc != H_RESOURCE) {
1955                 dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);
1956                 goto kill_kthread;
1957         }
1958         if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) {
1959                 dev_err(&vdev->dev, "couldn't initialize event pool\n");
1960                 goto init_pool_failed;
1961         }
1962
1963         host->max_lun = 8;
1964         host->max_id = max_id;
1965         host->max_channel = max_channel;
1966         host->max_cmd_len = 16;
1967
1968         if (scsi_add_host(hostdata->host, hostdata->dev))
1969                 goto add_host_failed;
1970
1971         /* we don't have a proper target_port_id so let's use the fake one */
1972         memcpy(ids.port_id, hostdata->madapter_info.partition_name,
1973                sizeof(ids.port_id));
1974         ids.roles = SRP_RPORT_ROLE_TARGET;
1975         rport = srp_rport_add(host, &ids);
1976         if (IS_ERR(rport))
1977                 goto add_srp_port_failed;
1978
1979         /* Try to send an initialization message.  Note that this is allowed
1980          * to fail if the other end is not acive.  In that case we don't
1981          * want to scan
1982          */
1983         if (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0) == 0
1984             || rc == H_RESOURCE) {
1985                 /*
1986                  * Wait around max init_timeout secs for the adapter to finish
1987                  * initializing. When we are done initializing, we will have a
1988                  * valid request_limit.  We don't want Linux scanning before
1989                  * we are ready.
1990                  */
1991                 for (wait_switch = jiffies + (init_timeout * HZ);
1992                      time_before(jiffies, wait_switch) &&
1993                      atomic_read(&hostdata->request_limit) < 2;) {
1994
1995                         msleep(10);
1996                 }
1997
1998                 /* if we now have a valid request_limit, initiate a scan */
1999                 if (atomic_read(&hostdata->request_limit) > 0)
2000                         scsi_scan_host(host);
2001         }
2002
2003         dev_set_drvdata(&vdev->dev, hostdata);
2004         return 0;
2005
2006       add_srp_port_failed:
2007         scsi_remove_host(hostdata->host);
2008       add_host_failed:
2009         release_event_pool(&hostdata->pool, hostdata);
2010       init_pool_failed:
2011         ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, max_events);
2012       kill_kthread:
2013       kthread_stop(hostdata->work_thread);
2014       init_crq_failed:
2015         unmap_persist_bufs(hostdata);
2016       persist_bufs_failed:
2017         scsi_host_put(host);
2018       scsi_host_alloc_failed:
2019         return -1;
2020 }
2021
2022 static int ibmvscsi_remove(struct vio_dev *vdev)
2023 {
2024         struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);
2025         unmap_persist_bufs(hostdata);
2026         release_event_pool(&hostdata->pool, hostdata);
2027         ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata,
2028                                         max_events);
2029
2030         kthread_stop(hostdata->work_thread);
2031         srp_remove_host(hostdata->host);
2032         scsi_remove_host(hostdata->host);
2033         scsi_host_put(hostdata->host);
2034
2035         return 0;
2036 }
2037
2038 /**
2039  * ibmvscsi_resume: Resume from suspend
2040  * @dev:        device struct
2041  *
2042  * We may have lost an interrupt across suspend/resume, so kick the
2043  * interrupt handler
2044  */
2045 static int ibmvscsi_resume(struct device *dev)
2046 {
2047         struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev);
2048         return ibmvscsi_ops->resume(hostdata);
2049 }
2050
2051 /**
2052  * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we 
2053  * support.
2054  */
2055 static struct vio_device_id ibmvscsi_device_table[] __devinitdata = {
2056         {"vscsi", "IBM,v-scsi"},
2057         { "", "" }
2058 };
2059 MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
2060
2061 static struct dev_pm_ops ibmvscsi_pm_ops = {
2062         .resume = ibmvscsi_resume
2063 };
2064
2065 static struct vio_driver ibmvscsi_driver = {
2066         .id_table = ibmvscsi_device_table,
2067         .probe = ibmvscsi_probe,
2068         .remove = ibmvscsi_remove,
2069         .get_desired_dma = ibmvscsi_get_desired_dma,
2070         .driver = {
2071                 .name = "ibmvscsi",
2072                 .owner = THIS_MODULE,
2073                 .pm = &ibmvscsi_pm_ops,
2074         }
2075 };
2076
2077 static struct srp_function_template ibmvscsi_transport_functions = {
2078 };
2079
2080 int __init ibmvscsi_module_init(void)
2081 {
2082         int ret;
2083
2084         /* Ensure we have two requests to do error recovery */
2085         driver_template.can_queue = max_requests;
2086         max_events = max_requests + 2;
2087
2088         if (firmware_has_feature(FW_FEATURE_ISERIES))
2089                 ibmvscsi_ops = &iseriesvscsi_ops;
2090         else if (firmware_has_feature(FW_FEATURE_VIO))
2091                 ibmvscsi_ops = &rpavscsi_ops;
2092         else
2093                 return -ENODEV;
2094
2095         ibmvscsi_transport_template =
2096                 srp_attach_transport(&ibmvscsi_transport_functions);
2097         if (!ibmvscsi_transport_template)
2098                 return -ENOMEM;
2099
2100         ret = vio_register_driver(&ibmvscsi_driver);
2101         if (ret)
2102                 srp_release_transport(ibmvscsi_transport_template);
2103         return ret;
2104 }
2105
2106 void __exit ibmvscsi_module_exit(void)
2107 {
2108         vio_unregister_driver(&ibmvscsi_driver);
2109         srp_release_transport(ibmvscsi_transport_template);
2110 }
2111
2112 module_init(ibmvscsi_module_init);
2113 module_exit(ibmvscsi_module_exit);