blob: 31fc21f4d831781c2844ab584abbeab576709bb1 [file] [log] [blame]
Darrick J. Wong338ec572006-10-18 14:43:37 -07001/*
2 * Support for SATA devices on Serial Attached SCSI (SAS) controllers
3 *
4 * Copyright (C) 2006 IBM Corporation
5 *
6 * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * 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
James Bottomleyb9142172007-07-22 13:15:55 -050024#include <linux/scatterlist.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/slab.h>
James Bottomleyb9142172007-07-22 13:15:55 -050026
Darrick J. Wong338ec572006-10-18 14:43:37 -070027#include <scsi/sas_ata.h>
28#include "sas_internal.h"
29#include <scsi/scsi_host.h>
30#include <scsi/scsi_device.h>
31#include <scsi/scsi_tcq.h>
32#include <scsi/scsi.h>
33#include <scsi/scsi_transport.h>
34#include <scsi/scsi_transport_sas.h>
35#include "../scsi_sas_internal.h"
Darrick J. Wong3a2755a2007-01-30 01:18:58 -080036#include "../scsi_transport_api.h"
37#include <scsi/scsi_eh.h>
Darrick J. Wong338ec572006-10-18 14:43:37 -070038
39static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
40{
41 /* Cheesy attempt to translate SAS errors into ATA. Hah! */
42
43 /* transport error */
44 if (ts->resp == SAS_TASK_UNDELIVERED)
45 return AC_ERR_ATA_BUS;
46
47 /* ts->resp == SAS_TASK_COMPLETE */
48 /* task delivered, what happened afterwards? */
49 switch (ts->stat) {
50 case SAS_DEV_NO_RESPONSE:
51 return AC_ERR_TIMEOUT;
52
53 case SAS_INTERRUPTED:
54 case SAS_PHY_DOWN:
55 case SAS_NAK_R_ERR:
56 return AC_ERR_ATA_BUS;
57
58
59 case SAS_DATA_UNDERRUN:
60 /*
61 * Some programs that use the taskfile interface
62 * (smartctl in particular) can cause underrun
63 * problems. Ignore these errors, perhaps at our
64 * peril.
65 */
66 return 0;
67
68 case SAS_DATA_OVERRUN:
69 case SAS_QUEUE_FULL:
70 case SAS_DEVICE_UNKNOWN:
71 case SAS_SG_ERR:
72 return AC_ERR_INVALID;
73
Darrick J. Wong338ec572006-10-18 14:43:37 -070074 case SAS_OPEN_TO:
75 case SAS_OPEN_REJECT:
76 SAS_DPRINTK("%s: Saw error %d. What to do?\n",
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -070077 __func__, ts->stat);
Darrick J. Wong338ec572006-10-18 14:43:37 -070078 return AC_ERR_OTHER;
79
James Bottomley75c0b382011-01-23 08:16:24 -060080 case SAM_STAT_CHECK_CONDITION:
Darrick J. Wong338ec572006-10-18 14:43:37 -070081 case SAS_ABORTED_TASK:
82 return AC_ERR_DEV;
83
84 case SAS_PROTO_RESPONSE:
85 /* This means the ending_fis has the error
86 * value; return 0 here to collect it */
87 return 0;
88 default:
89 return 0;
90 }
91}
92
93static void sas_ata_task_done(struct sas_task *task)
94{
95 struct ata_queued_cmd *qc = task->uldd_task;
Darrick J. Wong1c50dc82007-01-30 01:18:41 -080096 struct domain_device *dev;
Darrick J. Wong338ec572006-10-18 14:43:37 -070097 struct task_status_struct *stat = &task->task_status;
98 struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
Darrick J. Wong3a2755a2007-01-30 01:18:58 -080099 struct sas_ha_struct *sas_ha;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700100 enum ata_completion_errors ac;
Darrick J. Wong3eb7a512007-01-30 01:18:35 -0800101 unsigned long flags;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700102
Darrick J. Wong1c50dc82007-01-30 01:18:41 -0800103 if (!qc)
104 goto qc_already_gone;
105
106 dev = qc->ap->private_data;
Darrick J. Wong3a2755a2007-01-30 01:18:58 -0800107 sas_ha = dev->port->ha;
Darrick J. Wong1c50dc82007-01-30 01:18:41 -0800108
Darrick J. Wong3eb7a512007-01-30 01:18:35 -0800109 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
James Bottomley75c0b382011-01-23 08:16:24 -0600110 if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD ||
111 ((stat->stat == SAM_STAT_CHECK_CONDITION &&
112 dev->sata_dev.command_set == ATAPI_COMMAND_SET))) {
Darrick J. Wong338ec572006-10-18 14:43:37 -0700113 ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
114 qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
115 dev->sata_dev.sstatus = resp->sstatus;
116 dev->sata_dev.serror = resp->serror;
117 dev->sata_dev.scontrol = resp->scontrol;
James Bottomley75c0b382011-01-23 08:16:24 -0600118 } else {
Darrick J. Wong338ec572006-10-18 14:43:37 -0700119 ac = sas_to_ata_err(stat);
120 if (ac) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700121 SAS_DPRINTK("%s: SAS error %x\n", __func__,
Darrick J. Wong338ec572006-10-18 14:43:37 -0700122 stat->stat);
123 /* We saw a SAS error. Send a vague error. */
124 qc->err_mask = ac;
125 dev->sata_dev.tf.feature = 0x04; /* status err */
126 dev->sata_dev.tf.command = ATA_ERR;
127 }
128 }
129
Darrick J. Wong1c50dc82007-01-30 01:18:41 -0800130 qc->lldd_task = NULL;
Darrick J. Wongfe059f12007-01-30 01:18:55 -0800131 if (qc->scsicmd)
132 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
Darrick J. Wong338ec572006-10-18 14:43:37 -0700133 ata_qc_complete(qc);
Darrick J. Wong3eb7a512007-01-30 01:18:35 -0800134 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
135
Darrick J. Wong3a2755a2007-01-30 01:18:58 -0800136 /*
137 * If the sas_task has an ata qc, a scsi_cmnd and the aborted
138 * flag is set, then we must have come in via the libsas EH
139 * functions. When we exit this function, we need to put the
140 * scsi_cmnd on the list of finished errors. The ata_qc_complete
141 * call cleans up the libata side of things but we're protected
142 * from the scsi_cmnd going away because the scsi_cmnd is owned
143 * by the EH, making libata's call to scsi_done a NOP.
144 */
145 spin_lock_irqsave(&task->task_state_lock, flags);
146 if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
147 scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
148 spin_unlock_irqrestore(&task->task_state_lock, flags);
149
Darrick J. Wong1c50dc82007-01-30 01:18:41 -0800150qc_already_gone:
Darrick J. Wong338ec572006-10-18 14:43:37 -0700151 list_del_init(&task->list);
152 sas_free_task(task);
153}
154
155static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
156{
Darrick J. Wong35a7f2f2007-01-30 01:18:38 -0800157 int res;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700158 struct sas_task *task;
159 struct domain_device *dev = qc->ap->private_data;
160 struct sas_ha_struct *sas_ha = dev->port->ha;
161 struct Scsi_Host *host = sas_ha->core.shost;
162 struct sas_internal *i = to_sas_internal(host->transportt);
163 struct scatterlist *sg;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700164 unsigned int xfer = 0;
Tejun Heoff2aeb12007-12-05 16:43:11 +0900165 unsigned int si;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700166
Darrick J. Wong56dd2c02010-10-01 13:55:47 -0700167 /* If the device fell off, no sense in issuing commands */
168 if (dev->gone)
169 return AC_ERR_SYSTEM;
170
Darrick J. Wong338ec572006-10-18 14:43:37 -0700171 task = sas_alloc_task(GFP_ATOMIC);
172 if (!task)
Darrick J. Wong35a7f2f2007-01-30 01:18:38 -0800173 return AC_ERR_SYSTEM;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700174 task->dev = dev;
175 task->task_proto = SAS_PROTOCOL_STP;
176 task->task_done = sas_ata_task_done;
177
178 if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
179 qc->tf.command == ATA_CMD_FPDMA_READ) {
180 /* Need to zero out the tag libata assigned us */
181 qc->tf.nsect = 0;
182 }
183
James Bottomley110dd8f2007-07-20 13:11:44 -0500184 ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
Darrick J. Wong338ec572006-10-18 14:43:37 -0700185 task->uldd_task = qc;
Tejun Heo405e66b2007-11-27 19:28:53 +0900186 if (ata_is_atapi(qc->tf.protocol)) {
Darrick J. Wong338ec572006-10-18 14:43:37 -0700187 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
James Bottomleydde20202008-02-19 11:36:56 +0100188 task->total_xfer_len = qc->nbytes;
189 task->num_scatter = qc->n_elem;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700190 } else {
Tejun Heoff2aeb12007-12-05 16:43:11 +0900191 for_each_sg(qc->sg, sg, qc->n_elem, si)
Darrick J. Wong338ec572006-10-18 14:43:37 -0700192 xfer += sg->length;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700193
194 task->total_xfer_len = xfer;
Tejun Heoff2aeb12007-12-05 16:43:11 +0900195 task->num_scatter = si;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700196 }
197
198 task->data_dir = qc->dma_dir;
Tejun Heoff2aeb12007-12-05 16:43:11 +0900199 task->scatter = qc->sg;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700200 task->ata_task.retry_count = 1;
201 task->task_state_flags = SAS_TASK_STATE_PENDING;
Darrick J. Wong1c50dc82007-01-30 01:18:41 -0800202 qc->lldd_task = task;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700203
204 switch (qc->tf.protocol) {
205 case ATA_PROT_NCQ:
206 task->ata_task.use_ncq = 1;
207 /* fall through */
Tejun Heo0dc36882007-12-18 16:34:43 -0500208 case ATAPI_PROT_DMA:
Darrick J. Wong338ec572006-10-18 14:43:37 -0700209 case ATA_PROT_DMA:
210 task->ata_task.dma_xfer = 1;
211 break;
212 }
213
Darrick J. Wongfe059f12007-01-30 01:18:55 -0800214 if (qc->scsicmd)
215 ASSIGN_SAS_TASK(qc->scsicmd, task);
216
Darrick J. Wong338ec572006-10-18 14:43:37 -0700217 if (sas_ha->lldd_max_execute_num < 2)
218 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
219 else
220 res = sas_queue_up(task);
221
222 /* Examine */
223 if (res) {
224 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
225
Darrick J. Wongfe059f12007-01-30 01:18:55 -0800226 if (qc->scsicmd)
227 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
Darrick J. Wong338ec572006-10-18 14:43:37 -0700228 sas_free_task(task);
Darrick J. Wong35a7f2f2007-01-30 01:18:38 -0800229 return AC_ERR_SYSTEM;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700230 }
231
Darrick J. Wong35a7f2f2007-01-30 01:18:38 -0800232 return 0;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700233}
234
Tejun Heo4c9bf4e2008-04-07 22:47:20 +0900235static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
236{
237 struct domain_device *dev = qc->ap->private_data;
238
239 memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf));
240 return true;
241}
242
James Bottomley00dd4992011-01-23 09:44:12 -0600243static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
244 unsigned long deadline)
Darrick J. Wong338ec572006-10-18 14:43:37 -0700245{
James Bottomley00dd4992011-01-23 09:44:12 -0600246 struct ata_port *ap = link->ap;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700247 struct domain_device *dev = ap->private_data;
248 struct sas_internal *i =
249 to_sas_internal(dev->port->ha->core.shost->transportt);
James Bottomleya29c0512008-02-23 23:38:44 -0600250 int res = TMF_RESP_FUNC_FAILED;
James Bottomley00dd4992011-01-23 09:44:12 -0600251 int ret = 0;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700252
253 if (i->dft->lldd_I_T_nexus_reset)
254 res = i->dft->lldd_I_T_nexus_reset(dev);
255
James Bottomley00dd4992011-01-23 09:44:12 -0600256 if (res != TMF_RESP_FUNC_COMPLETE) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700257 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
James Bottomley00dd4992011-01-23 09:44:12 -0600258 ret = -EAGAIN;
259 }
Darrick J. Wong338ec572006-10-18 14:43:37 -0700260
261 switch (dev->sata_dev.command_set) {
262 case ATA_COMMAND_SET:
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700263 SAS_DPRINTK("%s: Found ATA device.\n", __func__);
James Bottomley00dd4992011-01-23 09:44:12 -0600264 *class = ATA_DEV_ATA;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700265 break;
266 case ATAPI_COMMAND_SET:
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700267 SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
James Bottomley00dd4992011-01-23 09:44:12 -0600268 *class = ATA_DEV_ATAPI;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700269 break;
270 default:
271 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700272 __func__,
Darrick J. Wong338ec572006-10-18 14:43:37 -0700273 dev->sata_dev.command_set);
James Bottomley00dd4992011-01-23 09:44:12 -0600274 *class = ATA_DEV_UNKNOWN;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700275 break;
276 }
277
278 ap->cbl = ATA_CBL_SATA;
James Bottomley00dd4992011-01-23 09:44:12 -0600279 return ret;
Darrick J. Wong338ec572006-10-18 14:43:37 -0700280}
281
282static void sas_ata_post_internal(struct ata_queued_cmd *qc)
283{
284 if (qc->flags & ATA_QCFLAG_FAILED)
285 qc->err_mask |= AC_ERR_OTHER;
286
Darrick J. Wong1c50dc82007-01-30 01:18:41 -0800287 if (qc->err_mask) {
288 /*
289 * Find the sas_task and kill it. By this point,
290 * libata has decided to kill the qc, so we needn't
291 * bother with sas_ata_task_done. But we still
292 * ought to abort the task.
293 */
294 struct sas_task *task = qc->lldd_task;
Darrick J. Wong3a2755a2007-01-30 01:18:58 -0800295 unsigned long flags;
Darrick J. Wong1c50dc82007-01-30 01:18:41 -0800296
297 qc->lldd_task = NULL;
298 if (task) {
Darrick J. Wong3a2755a2007-01-30 01:18:58 -0800299 /* Should this be a AT(API) device reset? */
300 spin_lock_irqsave(&task->task_state_lock, flags);
301 task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
302 spin_unlock_irqrestore(&task->task_state_lock, flags);
303
Darrick J. Wong1c50dc82007-01-30 01:18:41 -0800304 task->uldd_task = NULL;
305 __sas_task_abort(task);
306 }
Darrick J. Wong1c50dc82007-01-30 01:18:41 -0800307 }
Darrick J. Wong338ec572006-10-18 14:43:37 -0700308}
309
Darrick J. Wong338ec572006-10-18 14:43:37 -0700310static struct ata_port_operations sas_sata_ops = {
James Bottomley00dd4992011-01-23 09:44:12 -0600311 .prereset = ata_std_prereset,
312 .softreset = NULL,
313 .hardreset = sas_ata_hard_reset,
314 .postreset = ata_std_postreset,
315 .error_handler = ata_std_error_handler,
Darrick J. Wong338ec572006-10-18 14:43:37 -0700316 .post_internal_cmd = sas_ata_post_internal,
David Milburnf0ad30d2010-09-03 17:13:03 -0500317 .qc_defer = ata_std_qc_defer,
Darrick J. Wong338ec572006-10-18 14:43:37 -0700318 .qc_prep = ata_noop_qc_prep,
319 .qc_issue = sas_ata_qc_issue,
Tejun Heo4c9bf4e2008-04-07 22:47:20 +0900320 .qc_fill_rtf = sas_ata_qc_fill_rtf,
Darrick J. Wong338ec572006-10-18 14:43:37 -0700321 .port_start = ata_sas_port_start,
322 .port_stop = ata_sas_port_stop,
Darrick J. Wong338ec572006-10-18 14:43:37 -0700323};
324
325static struct ata_port_info sata_port_info = {
Sergei Shtylyov9cbe0562011-02-04 22:05:48 +0300326 .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
Sergei Shtylyov0f2e0332011-01-21 20:32:01 +0300327 .pio_mask = ATA_PIO4,
328 .mwdma_mask = ATA_MWDMA2,
Darrick J. Wong338ec572006-10-18 14:43:37 -0700329 .udma_mask = ATA_UDMA6,
330 .port_ops = &sas_sata_ops
331};
332
333int sas_ata_init_host_and_port(struct domain_device *found_dev,
334 struct scsi_target *starget)
335{
336 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
337 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
338 struct ata_port *ap;
339
340 ata_host_init(&found_dev->sata_dev.ata_host,
Jeff Garzik1d1bbee2007-07-26 09:28:37 -0400341 ha->dev,
Darrick J. Wong338ec572006-10-18 14:43:37 -0700342 sata_port_info.flags,
343 &sas_sata_ops);
344 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
345 &sata_port_info,
346 shost);
347 if (!ap) {
348 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
349 return -ENODEV;
350 }
351
352 ap->private_data = found_dev;
353 ap->cbl = ATA_CBL_SATA;
354 ap->scsi_host = shost;
355 found_dev->sata_dev.ap = ap;
356
357 return 0;
358}
Darrick J. Wong3a2755a2007-01-30 01:18:58 -0800359
360void sas_ata_task_abort(struct sas_task *task)
361{
362 struct ata_queued_cmd *qc = task->uldd_task;
363 struct completion *waiting;
364
365 /* Bounce SCSI-initiated commands to the SCSI EH */
366 if (qc->scsicmd) {
James Bottomley1b4d0d82010-05-13 09:31:54 -0500367 struct request_queue *q = qc->scsicmd->device->request_queue;
368 unsigned long flags;
369
Tejun Heo70b25f82010-04-15 09:00:08 +0900370 spin_lock_irqsave(q->queue_lock, flags);
Jens Axboe242f9dc2008-09-14 05:55:09 -0700371 blk_abort_request(qc->scsicmd->request);
Tejun Heo70b25f82010-04-15 09:00:08 +0900372 spin_unlock_irqrestore(q->queue_lock, flags);
Darrick J. Wong3a2755a2007-01-30 01:18:58 -0800373 scsi_schedule_eh(qc->scsicmd->device->host);
374 return;
375 }
376
377 /* Internal command, fake a timeout and complete. */
378 qc->flags &= ~ATA_QCFLAG_ACTIVE;
379 qc->flags |= ATA_QCFLAG_FAILED;
380 qc->err_mask |= AC_ERR_TIMEOUT;
381 waiting = qc->private_data;
382 complete(waiting);
383}
James Bottomleyb9142172007-07-22 13:15:55 -0500384
385static void sas_task_timedout(unsigned long _task)
386{
387 struct sas_task *task = (void *) _task;
388 unsigned long flags;
389
390 spin_lock_irqsave(&task->task_state_lock, flags);
391 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
392 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
393 spin_unlock_irqrestore(&task->task_state_lock, flags);
394
395 complete(&task->completion);
396}
397
398static void sas_disc_task_done(struct sas_task *task)
399{
400 if (!del_timer(&task->timer))
401 return;
402 complete(&task->completion);
403}
404
405#define SAS_DEV_TIMEOUT 10
406
407/**
408 * sas_execute_task -- Basic task processing for discovery
409 * @task: the task to be executed
410 * @buffer: pointer to buffer to do I/O
411 * @size: size of @buffer
Jeff Garzik1d1bbee2007-07-26 09:28:37 -0400412 * @dma_dir: DMA direction. DMA_xxx
James Bottomleyb9142172007-07-22 13:15:55 -0500413 */
414static int sas_execute_task(struct sas_task *task, void *buffer, int size,
Jeff Garzik1d1bbee2007-07-26 09:28:37 -0400415 enum dma_data_direction dma_dir)
James Bottomleyb9142172007-07-22 13:15:55 -0500416{
417 int res = 0;
418 struct scatterlist *scatter = NULL;
419 struct task_status_struct *ts = &task->task_status;
420 int num_scatter = 0;
421 int retries = 0;
422 struct sas_internal *i =
423 to_sas_internal(task->dev->port->ha->core.shost->transportt);
424
Jeff Garzik1d1bbee2007-07-26 09:28:37 -0400425 if (dma_dir != DMA_NONE) {
James Bottomleyb9142172007-07-22 13:15:55 -0500426 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
427 if (!scatter)
428 goto out;
429
430 sg_init_one(scatter, buffer, size);
431 num_scatter = 1;
432 }
433
434 task->task_proto = task->dev->tproto;
435 task->scatter = scatter;
436 task->num_scatter = num_scatter;
437 task->total_xfer_len = size;
Jeff Garzik1d1bbee2007-07-26 09:28:37 -0400438 task->data_dir = dma_dir;
James Bottomleyb9142172007-07-22 13:15:55 -0500439 task->task_done = sas_disc_task_done;
Jeff Garzik1d1bbee2007-07-26 09:28:37 -0400440 if (dma_dir != DMA_NONE &&
James Bottomleyb9142172007-07-22 13:15:55 -0500441 sas_protocol_ata(task->task_proto)) {
Jeff Garzik1d1bbee2007-07-26 09:28:37 -0400442 task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
James Bottomleyb9142172007-07-22 13:15:55 -0500443 task->scatter,
444 task->num_scatter,
445 task->data_dir);
446 }
447
448 for (retries = 0; retries < 5; retries++) {
449 task->task_state_flags = SAS_TASK_STATE_PENDING;
450 init_completion(&task->completion);
451
452 task->timer.data = (unsigned long) task;
453 task->timer.function = sas_task_timedout;
454 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
455 add_timer(&task->timer);
456
457 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
458 if (res) {
459 del_timer(&task->timer);
460 SAS_DPRINTK("executing SAS discovery task failed:%d\n",
461 res);
462 goto ex_err;
463 }
464 wait_for_completion(&task->completion);
James Bottomley32e8ae32007-12-30 12:37:31 -0600465 res = -ECOMM;
James Bottomleyb9142172007-07-22 13:15:55 -0500466 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
467 int res2;
468 SAS_DPRINTK("task aborted, flags:0x%x\n",
469 task->task_state_flags);
470 res2 = i->dft->lldd_abort_task(task);
471 SAS_DPRINTK("came back from abort task\n");
472 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
473 if (res2 == TMF_RESP_FUNC_COMPLETE)
474 continue; /* Retry the task */
475 else
476 goto ex_err;
477 }
478 }
James Bottomleydf64d3c2010-07-27 15:51:13 -0500479 if (task->task_status.stat == SAM_STAT_BUSY ||
480 task->task_status.stat == SAM_STAT_TASK_SET_FULL ||
James Bottomleyb9142172007-07-22 13:15:55 -0500481 task->task_status.stat == SAS_QUEUE_FULL) {
482 SAS_DPRINTK("task: q busy, sleeping...\n");
483 schedule_timeout_interruptible(HZ);
James Bottomleydf64d3c2010-07-27 15:51:13 -0500484 } else if (task->task_status.stat == SAM_STAT_CHECK_CONDITION) {
James Bottomleyb9142172007-07-22 13:15:55 -0500485 struct scsi_sense_hdr shdr;
486
487 if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
488 &shdr)) {
489 SAS_DPRINTK("couldn't normalize sense\n");
490 continue;
491 }
492 if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
493 (shdr.sense_key == 2 && shdr.asc == 4 &&
494 shdr.ascq == 1)) {
495 SAS_DPRINTK("device %016llx LUN: %016llx "
496 "powering up or not ready yet, "
497 "sleeping...\n",
498 SAS_ADDR(task->dev->sas_addr),
499 SAS_ADDR(task->ssp_task.LUN));
500
501 schedule_timeout_interruptible(5*HZ);
502 } else if (shdr.sense_key == 1) {
503 res = 0;
504 break;
505 } else if (shdr.sense_key == 5) {
506 break;
507 } else {
508 SAS_DPRINTK("dev %016llx LUN: %016llx "
509 "sense key:0x%x ASC:0x%x ASCQ:0x%x"
510 "\n",
511 SAS_ADDR(task->dev->sas_addr),
512 SAS_ADDR(task->ssp_task.LUN),
513 shdr.sense_key,
514 shdr.asc, shdr.ascq);
515 }
516 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
James Bottomleydf64d3c2010-07-27 15:51:13 -0500517 task->task_status.stat != SAM_STAT_GOOD) {
James Bottomleyb9142172007-07-22 13:15:55 -0500518 SAS_DPRINTK("task finished with resp:0x%x, "
519 "stat:0x%x\n",
520 task->task_status.resp,
521 task->task_status.stat);
522 goto ex_err;
523 } else {
524 res = 0;
525 break;
526 }
527 }
528ex_err:
Jeff Garzik1d1bbee2007-07-26 09:28:37 -0400529 if (dma_dir != DMA_NONE) {
James Bottomleyb9142172007-07-22 13:15:55 -0500530 if (sas_protocol_ata(task->task_proto))
Jeff Garzik1d1bbee2007-07-26 09:28:37 -0400531 dma_unmap_sg(task->dev->port->ha->dev,
James Bottomleyb9142172007-07-22 13:15:55 -0500532 task->scatter, task->num_scatter,
533 task->data_dir);
534 kfree(scatter);
535 }
536out:
537 return res;
538}
539
540/* ---------- SATA ---------- */
541
542static void sas_get_ata_command_set(struct domain_device *dev)
543{
544 struct dev_to_host_fis *fis =
545 (struct dev_to_host_fis *) dev->frame_rcvd;
546
547 if ((fis->sector_count == 1 && /* ATA */
548 fis->lbal == 1 &&
549 fis->lbam == 0 &&
550 fis->lbah == 0 &&
551 fis->device == 0)
552 ||
553 (fis->sector_count == 0 && /* CE-ATA (mATA) */
554 fis->lbal == 0 &&
555 fis->lbam == 0xCE &&
556 fis->lbah == 0xAA &&
557 (fis->device & ~0x10) == 0))
558
559 dev->sata_dev.command_set = ATA_COMMAND_SET;
560
561 else if ((fis->interrupt_reason == 1 && /* ATAPI */
562 fis->lbal == 1 &&
563 fis->byte_count_low == 0x14 &&
564 fis->byte_count_high == 0xEB &&
565 (fis->device & ~0x10) == 0))
566
567 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
568
569 else if ((fis->sector_count == 1 && /* SEMB */
570 fis->lbal == 1 &&
571 fis->lbam == 0x3C &&
572 fis->lbah == 0xC3 &&
573 fis->device == 0)
574 ||
575 (fis->interrupt_reason == 1 && /* SATA PM */
576 fis->lbal == 1 &&
577 fis->byte_count_low == 0x69 &&
578 fis->byte_count_high == 0x96 &&
579 (fis->device & ~0x10) == 0))
580
581 /* Treat it as a superset? */
582 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
583}
584
585/**
586 * sas_issue_ata_cmd -- Basic SATA command processing for discovery
587 * @dev: the device to send the command to
588 * @command: the command register
589 * @features: the features register
590 * @buffer: pointer to buffer to do I/O
591 * @size: size of @buffer
Jeff Garzik1d1bbee2007-07-26 09:28:37 -0400592 * @dma_dir: DMA direction. DMA_xxx
James Bottomleyb9142172007-07-22 13:15:55 -0500593 */
594static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
595 u8 features, void *buffer, int size,
Jeff Garzik1d1bbee2007-07-26 09:28:37 -0400596 enum dma_data_direction dma_dir)
James Bottomleyb9142172007-07-22 13:15:55 -0500597{
598 int res = 0;
599 struct sas_task *task;
600 struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
601 &dev->frame_rcvd[0];
602
603 res = -ENOMEM;
604 task = sas_alloc_task(GFP_KERNEL);
605 if (!task)
606 goto out;
607
608 task->dev = dev;
609
610 task->ata_task.fis.fis_type = 0x27;
611 task->ata_task.fis.command = command;
612 task->ata_task.fis.features = features;
613 task->ata_task.fis.device = d2h_fis->device;
614 task->ata_task.retry_count = 1;
615
Jeff Garzik1d1bbee2007-07-26 09:28:37 -0400616 res = sas_execute_task(task, buffer, size, dma_dir);
James Bottomleyb9142172007-07-22 13:15:55 -0500617
618 sas_free_task(task);
619out:
620 return res;
621}
622
James Bottomleyb9142172007-07-22 13:15:55 -0500623#define ATA_IDENTIFY_DEV 0xEC
624#define ATA_IDENTIFY_PACKET_DEV 0xA1
625#define ATA_SET_FEATURES 0xEF
626#define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
627
628/**
629 * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
630 * @dev: STP/SATA device of interest (ATA/ATAPI)
631 *
632 * The LLDD has already been notified of this device, so that we can
633 * send FISes to it. Here we try to get IDENTIFY DEVICE or IDENTIFY
634 * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
635 * performance for this device.
636 */
637static int sas_discover_sata_dev(struct domain_device *dev)
638{
639 int res;
640 __le16 *identify_x;
641 u8 command;
642
643 identify_x = kzalloc(512, GFP_KERNEL);
644 if (!identify_x)
645 return -ENOMEM;
646
647 if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
648 dev->sata_dev.identify_device = identify_x;
649 command = ATA_IDENTIFY_DEV;
650 } else {
651 dev->sata_dev.identify_packet_device = identify_x;
652 command = ATA_IDENTIFY_PACKET_DEV;
653 }
654
655 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
Jeff Garzik1d1bbee2007-07-26 09:28:37 -0400656 DMA_FROM_DEVICE);
James Bottomleyb9142172007-07-22 13:15:55 -0500657 if (res)
658 goto out_err;
659
660 /* lives on the media? */
661 if (le16_to_cpu(identify_x[0]) & 4) {
662 /* incomplete response */
663 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
664 "dev %llx\n", SAS_ADDR(dev->sas_addr));
Al Viro17b7a8d2008-04-16 23:27:45 +0100665 if (!(identify_x[83] & cpu_to_le16(1<<6)))
James Bottomleyb9142172007-07-22 13:15:55 -0500666 goto cont1;
667 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
668 ATA_FEATURE_PUP_STBY_SPIN_UP,
Jeff Garzik1d1bbee2007-07-26 09:28:37 -0400669 NULL, 0, DMA_NONE);
James Bottomleyb9142172007-07-22 13:15:55 -0500670 if (res)
671 goto cont1;
672
673 schedule_timeout_interruptible(5*HZ); /* More time? */
674 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
Jeff Garzik1d1bbee2007-07-26 09:28:37 -0400675 DMA_FROM_DEVICE);
James Bottomleyb9142172007-07-22 13:15:55 -0500676 if (res)
677 goto out_err;
678 }
679cont1:
James Bottomleyb9142172007-07-22 13:15:55 -0500680 /* XXX Hint: register this SATA device with SATL.
681 When this returns, dev->sata_dev->lu is alive and
682 present.
683 sas_satl_register_dev(dev);
684 */
685
686 sas_fill_in_rphy(dev, dev->rphy);
687
688 return 0;
689out_err:
690 dev->sata_dev.identify_packet_device = NULL;
691 dev->sata_dev.identify_device = NULL;
692 kfree(identify_x);
693 return res;
694}
695
696static int sas_discover_sata_pm(struct domain_device *dev)
697{
698 return -ENODEV;
699}
700
701/**
702 * sas_discover_sata -- discover an STP/SATA domain device
703 * @dev: pointer to struct domain_device of interest
704 *
705 * First we notify the LLDD of this device, so we can send frames to
706 * it. Then depending on the type of device we call the appropriate
707 * discover functions. Once device discover is done, we notify the
708 * LLDD so that it can fine-tune its parameters for the device, by
709 * removing it and then adding it. That is, the second time around,
710 * the driver would have certain fields, that it is looking at, set.
711 * Finally we initialize the kobj so that the device can be added to
712 * the system at registration time. Devices directly attached to a HA
713 * port, have no parents. All other devices do, and should have their
714 * "parent" pointer set appropriately before calling this function.
715 */
716int sas_discover_sata(struct domain_device *dev)
717{
718 int res;
719
720 sas_get_ata_command_set(dev);
721
722 res = sas_notify_lldd_dev_found(dev);
723 if (res)
724 return res;
725
726 switch (dev->dev_type) {
727 case SATA_DEV:
728 res = sas_discover_sata_dev(dev);
729 break;
730 case SATA_PM:
731 res = sas_discover_sata_pm(dev);
732 break;
733 default:
734 break;
735 }
736 sas_notify_lldd_dev_gone(dev);
737 if (!res) {
738 sas_notify_lldd_dev_found(dev);
739 res = sas_rphy_add(dev->rphy);
740 }
741
742 return res;
743}
James Bottomley00dd4992011-01-23 09:44:12 -0600744
745void sas_ata_strategy_handler(struct Scsi_Host *shost)
746{
747 struct scsi_device *sdev;
748
749 shost_for_each_device(sdev, shost) {
750 struct domain_device *ddev = sdev_to_domain_dev(sdev);
751 struct ata_port *ap = ddev->sata_dev.ap;
752
753 if (!dev_is_sata(ddev))
754 continue;
James Bottomleyc2991902011-01-23 09:44:12 -0600755
James Bottomley00dd4992011-01-23 09:44:12 -0600756 ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler");
757 ata_scsi_port_error_handler(shost, ap);
758 }
759}
760
761int sas_ata_timed_out(struct scsi_cmnd *cmd, struct sas_task *task,
762 enum blk_eh_timer_return *rtn)
763{
764 struct domain_device *ddev = cmd_to_domain_dev(cmd);
765
766 if (!dev_is_sata(ddev) || task)
767 return 0;
768
769 /* we're a sata device with no task, so this must be a libata
770 * eh timeout. Ideally should hook into libata timeout
771 * handling, but there's no point, it just wants to activate
772 * the eh thread */
773 *rtn = BLK_EH_NOT_HANDLED;
774 return 1;
775}
776
777int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
778 struct list_head *done_q)
779{
780 int rtn = 0;
781 struct scsi_cmnd *cmd, *n;
782 struct ata_port *ap;
783
784 do {
785 LIST_HEAD(sata_q);
786
787 ap = NULL;
James Bottomleyc2991902011-01-23 09:44:12 -0600788
James Bottomley00dd4992011-01-23 09:44:12 -0600789 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
790 struct domain_device *ddev = cmd_to_domain_dev(cmd);
791
792 if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
793 continue;
James Bottomleyc2991902011-01-23 09:44:12 -0600794 if (ap && ap != ddev->sata_dev.ap)
James Bottomley00dd4992011-01-23 09:44:12 -0600795 continue;
796 ap = ddev->sata_dev.ap;
797 rtn = 1;
798 list_move(&cmd->eh_entry, &sata_q);
799 }
800
801 if (!list_empty(&sata_q)) {
James Bottomleyc2991902011-01-23 09:44:12 -0600802 ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata cmd error handler\n");
James Bottomley00dd4992011-01-23 09:44:12 -0600803 ata_scsi_cmd_error_handler(shost, ap, &sata_q);
James Bottomleya82058a2011-03-10 17:13:18 -0600804 /*
805 * ata's error handler may leave the cmd on the list
806 * so make sure they don't remain on a stack list
807 * about to go out of scope.
808 *
809 * This looks strange, since the commands are
810 * now part of no list, but the next error
811 * action will be ata_port_error_handler()
812 * which takes no list and sweeps them up
813 * anyway from the ata tag array.
814 */
815 while (!list_empty(&sata_q))
816 list_del_init(sata_q.next);
James Bottomley00dd4992011-01-23 09:44:12 -0600817 }
818 } while (ap);
819
820 return rtn;
821}