2 * Support for SATA devices on Serial Attached SCSI (SAS) controllers
4 * Copyright (C) 2006 IBM Corporation
6 * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
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.
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.
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
24 #include <scsi/sas_ata.h>
25 #include "sas_internal.h"
26 #include <scsi/scsi_host.h>
27 #include <scsi/scsi_device.h>
28 #include <scsi/scsi_tcq.h>
29 #include <scsi/scsi.h>
30 #include <scsi/scsi_transport.h>
31 #include <scsi/scsi_transport_sas.h>
32 #include "../scsi_sas_internal.h"
33 #include "../scsi_transport_api.h"
34 #include <scsi/scsi_eh.h>
36 static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
38 /* Cheesy attempt to translate SAS errors into ATA. Hah! */
41 if (ts->resp == SAS_TASK_UNDELIVERED)
42 return AC_ERR_ATA_BUS;
44 /* ts->resp == SAS_TASK_COMPLETE */
45 /* task delivered, what happened afterwards? */
47 case SAS_DEV_NO_RESPONSE:
48 return AC_ERR_TIMEOUT;
53 return AC_ERR_ATA_BUS;
56 case SAS_DATA_UNDERRUN:
58 * Some programs that use the taskfile interface
59 * (smartctl in particular) can cause underrun
60 * problems. Ignore these errors, perhaps at our
65 case SAS_DATA_OVERRUN:
67 case SAS_DEVICE_UNKNOWN:
69 return AC_ERR_INVALID;
74 SAS_DPRINTK("%s: Saw error %d. What to do?\n",
75 __FUNCTION__, ts->stat);
78 case SAS_ABORTED_TASK:
81 case SAS_PROTO_RESPONSE:
82 /* This means the ending_fis has the error
83 * value; return 0 here to collect it */
90 static void sas_ata_task_done(struct sas_task *task)
92 struct ata_queued_cmd *qc = task->uldd_task;
93 struct domain_device *dev;
94 struct task_status_struct *stat = &task->task_status;
95 struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
96 struct sas_ha_struct *sas_ha;
97 enum ata_completion_errors ac;
101 goto qc_already_gone;
103 dev = qc->ap->private_data;
104 sas_ha = dev->port->ha;
106 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
107 if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_GOOD) {
108 ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
109 qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
110 dev->sata_dev.sstatus = resp->sstatus;
111 dev->sata_dev.serror = resp->serror;
112 dev->sata_dev.scontrol = resp->scontrol;
113 } else if (stat->stat != SAM_STAT_GOOD) {
114 ac = sas_to_ata_err(stat);
116 SAS_DPRINTK("%s: SAS error %x\n", __FUNCTION__,
118 /* We saw a SAS error. Send a vague error. */
120 dev->sata_dev.tf.feature = 0x04; /* status err */
121 dev->sata_dev.tf.command = ATA_ERR;
125 qc->lldd_task = NULL;
127 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
129 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
132 * If the sas_task has an ata qc, a scsi_cmnd and the aborted
133 * flag is set, then we must have come in via the libsas EH
134 * functions. When we exit this function, we need to put the
135 * scsi_cmnd on the list of finished errors. The ata_qc_complete
136 * call cleans up the libata side of things but we're protected
137 * from the scsi_cmnd going away because the scsi_cmnd is owned
138 * by the EH, making libata's call to scsi_done a NOP.
140 spin_lock_irqsave(&task->task_state_lock, flags);
141 if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
142 scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
143 spin_unlock_irqrestore(&task->task_state_lock, flags);
146 list_del_init(&task->list);
150 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
153 struct sas_task *task;
154 struct domain_device *dev = qc->ap->private_data;
155 struct sas_ha_struct *sas_ha = dev->port->ha;
156 struct Scsi_Host *host = sas_ha->core.shost;
157 struct sas_internal *i = to_sas_internal(host->transportt);
158 struct scatterlist *sg;
159 unsigned int num = 0;
160 unsigned int xfer = 0;
162 task = sas_alloc_task(GFP_ATOMIC);
164 return AC_ERR_SYSTEM;
166 task->task_proto = SAS_PROTOCOL_STP;
167 task->task_done = sas_ata_task_done;
169 if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
170 qc->tf.command == ATA_CMD_FPDMA_READ) {
171 /* Need to zero out the tag libata assigned us */
175 ata_tf_to_fis(&qc->tf, (u8*)&task->ata_task.fis, 0);
176 task->uldd_task = qc;
177 if (is_atapi_taskfile(&qc->tf)) {
178 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
179 task->total_xfer_len = qc->nbytes + qc->pad_len;
180 task->num_scatter = qc->pad_len ? qc->n_elem + 1 : qc->n_elem;
182 ata_for_each_sg(sg, qc) {
187 task->total_xfer_len = xfer;
188 task->num_scatter = num;
191 task->data_dir = qc->dma_dir;
192 task->scatter = qc->__sg;
193 task->ata_task.retry_count = 1;
194 task->task_state_flags = SAS_TASK_STATE_PENDING;
195 qc->lldd_task = task;
197 switch (qc->tf.protocol) {
199 task->ata_task.use_ncq = 1;
201 case ATA_PROT_ATAPI_DMA:
203 task->ata_task.dma_xfer = 1;
208 ASSIGN_SAS_TASK(qc->scsicmd, task);
210 if (sas_ha->lldd_max_execute_num < 2)
211 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
213 res = sas_queue_up(task);
217 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
220 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
222 return AC_ERR_SYSTEM;
228 static u8 sas_ata_check_status(struct ata_port *ap)
230 struct domain_device *dev = ap->private_data;
231 return dev->sata_dev.tf.command;
234 static void sas_ata_phy_reset(struct ata_port *ap)
236 struct domain_device *dev = ap->private_data;
237 struct sas_internal *i =
238 to_sas_internal(dev->port->ha->core.shost->transportt);
241 if (i->dft->lldd_I_T_nexus_reset)
242 res = i->dft->lldd_I_T_nexus_reset(dev);
245 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __FUNCTION__);
247 switch (dev->sata_dev.command_set) {
248 case ATA_COMMAND_SET:
249 SAS_DPRINTK("%s: Found ATA device.\n", __FUNCTION__);
250 ap->device[0].class = ATA_DEV_ATA;
252 case ATAPI_COMMAND_SET:
253 SAS_DPRINTK("%s: Found ATAPI device.\n", __FUNCTION__);
254 ap->device[0].class = ATA_DEV_ATAPI;
257 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
259 dev->sata_dev.command_set);
260 ap->device[0].class = ATA_DEV_UNKNOWN;
264 ap->cbl = ATA_CBL_SATA;
267 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
269 if (qc->flags & ATA_QCFLAG_FAILED)
270 qc->err_mask |= AC_ERR_OTHER;
274 * Find the sas_task and kill it. By this point,
275 * libata has decided to kill the qc, so we needn't
276 * bother with sas_ata_task_done. But we still
277 * ought to abort the task.
279 struct sas_task *task = qc->lldd_task;
282 qc->lldd_task = NULL;
284 /* Should this be a AT(API) device reset? */
285 spin_lock_irqsave(&task->task_state_lock, flags);
286 task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
287 spin_unlock_irqrestore(&task->task_state_lock, flags);
289 task->uldd_task = NULL;
290 __sas_task_abort(task);
295 static void sas_ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
297 struct domain_device *dev = ap->private_data;
298 memcpy(tf, &dev->sata_dev.tf, sizeof (*tf));
301 static void sas_ata_scr_write(struct ata_port *ap, unsigned int sc_reg_in,
304 struct domain_device *dev = ap->private_data;
306 SAS_DPRINTK("STUB %s\n", __FUNCTION__);
309 dev->sata_dev.sstatus = val;
312 dev->sata_dev.scontrol = val;
315 dev->sata_dev.serror = val;
318 dev->sata_dev.ap->sactive = val;
323 static u32 sas_ata_scr_read(struct ata_port *ap, unsigned int sc_reg_in)
325 struct domain_device *dev = ap->private_data;
327 SAS_DPRINTK("STUB %s\n", __FUNCTION__);
330 return dev->sata_dev.sstatus;
332 return dev->sata_dev.scontrol;
334 return dev->sata_dev.serror;
336 return dev->sata_dev.ap->sactive;
342 static struct ata_port_operations sas_sata_ops = {
343 .port_disable = ata_port_disable,
344 .check_status = sas_ata_check_status,
345 .check_altstatus = sas_ata_check_status,
346 .dev_select = ata_noop_dev_select,
347 .phy_reset = sas_ata_phy_reset,
348 .post_internal_cmd = sas_ata_post_internal,
349 .tf_read = sas_ata_tf_read,
350 .qc_prep = ata_noop_qc_prep,
351 .qc_issue = sas_ata_qc_issue,
352 .port_start = ata_sas_port_start,
353 .port_stop = ata_sas_port_stop,
354 .scr_read = sas_ata_scr_read,
355 .scr_write = sas_ata_scr_write
358 static struct ata_port_info sata_port_info = {
359 .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET |
360 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
361 .pio_mask = 0x1f, /* PIO0-4 */
362 .mwdma_mask = 0x07, /* MWDMA0-2 */
363 .udma_mask = ATA_UDMA6,
364 .port_ops = &sas_sata_ops
367 int sas_ata_init_host_and_port(struct domain_device *found_dev,
368 struct scsi_target *starget)
370 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
371 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
374 ata_host_init(&found_dev->sata_dev.ata_host,
376 sata_port_info.flags,
378 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
382 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
386 ap->private_data = found_dev;
387 ap->cbl = ATA_CBL_SATA;
388 ap->scsi_host = shost;
389 found_dev->sata_dev.ap = ap;
394 void sas_ata_task_abort(struct sas_task *task)
396 struct ata_queued_cmd *qc = task->uldd_task;
397 struct completion *waiting;
399 /* Bounce SCSI-initiated commands to the SCSI EH */
401 scsi_req_abort_cmd(qc->scsicmd);
402 scsi_schedule_eh(qc->scsicmd->device->host);
406 /* Internal command, fake a timeout and complete. */
407 qc->flags &= ~ATA_QCFLAG_ACTIVE;
408 qc->flags |= ATA_QCFLAG_FAILED;
409 qc->err_mask |= AC_ERR_TIMEOUT;
410 waiting = qc->private_data;