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338ec570 DW |
1 | /* |
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 | ||
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" | |
3a2755af DW |
33 | #include "../scsi_transport_api.h" |
34 | #include <scsi/scsi_eh.h> | |
338ec570 DW |
35 | |
36 | static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts) | |
37 | { | |
38 | /* Cheesy attempt to translate SAS errors into ATA. Hah! */ | |
39 | ||
40 | /* transport error */ | |
41 | if (ts->resp == SAS_TASK_UNDELIVERED) | |
42 | return AC_ERR_ATA_BUS; | |
43 | ||
44 | /* ts->resp == SAS_TASK_COMPLETE */ | |
45 | /* task delivered, what happened afterwards? */ | |
46 | switch (ts->stat) { | |
47 | case SAS_DEV_NO_RESPONSE: | |
48 | return AC_ERR_TIMEOUT; | |
49 | ||
50 | case SAS_INTERRUPTED: | |
51 | case SAS_PHY_DOWN: | |
52 | case SAS_NAK_R_ERR: | |
53 | return AC_ERR_ATA_BUS; | |
54 | ||
55 | ||
56 | case SAS_DATA_UNDERRUN: | |
57 | /* | |
58 | * Some programs that use the taskfile interface | |
59 | * (smartctl in particular) can cause underrun | |
60 | * problems. Ignore these errors, perhaps at our | |
61 | * peril. | |
62 | */ | |
63 | return 0; | |
64 | ||
65 | case SAS_DATA_OVERRUN: | |
66 | case SAS_QUEUE_FULL: | |
67 | case SAS_DEVICE_UNKNOWN: | |
68 | case SAS_SG_ERR: | |
69 | return AC_ERR_INVALID; | |
70 | ||
71 | case SAM_CHECK_COND: | |
72 | case SAS_OPEN_TO: | |
73 | case SAS_OPEN_REJECT: | |
74 | SAS_DPRINTK("%s: Saw error %d. What to do?\n", | |
75 | __FUNCTION__, ts->stat); | |
76 | return AC_ERR_OTHER; | |
77 | ||
78 | case SAS_ABORTED_TASK: | |
79 | return AC_ERR_DEV; | |
80 | ||
81 | case SAS_PROTO_RESPONSE: | |
82 | /* This means the ending_fis has the error | |
83 | * value; return 0 here to collect it */ | |
84 | return 0; | |
85 | default: | |
86 | return 0; | |
87 | } | |
88 | } | |
89 | ||
90 | static void sas_ata_task_done(struct sas_task *task) | |
91 | { | |
92 | struct ata_queued_cmd *qc = task->uldd_task; | |
1c50dc83 | 93 | struct domain_device *dev; |
338ec570 DW |
94 | struct task_status_struct *stat = &task->task_status; |
95 | struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf; | |
3a2755af | 96 | struct sas_ha_struct *sas_ha; |
338ec570 | 97 | enum ata_completion_errors ac; |
3eb7a51a | 98 | unsigned long flags; |
338ec570 | 99 | |
1c50dc83 DW |
100 | if (!qc) |
101 | goto qc_already_gone; | |
102 | ||
103 | dev = qc->ap->private_data; | |
3a2755af | 104 | sas_ha = dev->port->ha; |
1c50dc83 | 105 | |
3eb7a51a | 106 | spin_lock_irqsave(dev->sata_dev.ap->lock, flags); |
d97db63f | 107 | if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_GOOD) { |
338ec570 DW |
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; | |
338ec570 DW |
113 | } else if (stat->stat != SAM_STAT_GOOD) { |
114 | ac = sas_to_ata_err(stat); | |
115 | if (ac) { | |
116 | SAS_DPRINTK("%s: SAS error %x\n", __FUNCTION__, | |
117 | stat->stat); | |
118 | /* We saw a SAS error. Send a vague error. */ | |
119 | qc->err_mask = ac; | |
120 | dev->sata_dev.tf.feature = 0x04; /* status err */ | |
121 | dev->sata_dev.tf.command = ATA_ERR; | |
122 | } | |
123 | } | |
124 | ||
1c50dc83 | 125 | qc->lldd_task = NULL; |
fe059f12 DW |
126 | if (qc->scsicmd) |
127 | ASSIGN_SAS_TASK(qc->scsicmd, NULL); | |
338ec570 | 128 | ata_qc_complete(qc); |
3eb7a51a DW |
129 | spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags); |
130 | ||
3a2755af DW |
131 | /* |
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. | |
139 | */ | |
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); | |
144 | ||
1c50dc83 | 145 | qc_already_gone: |
338ec570 DW |
146 | list_del_init(&task->list); |
147 | sas_free_task(task); | |
148 | } | |
149 | ||
150 | static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc) | |
151 | { | |
35a7f2f6 | 152 | int res; |
338ec570 DW |
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; | |
161 | ||
162 | task = sas_alloc_task(GFP_ATOMIC); | |
163 | if (!task) | |
35a7f2f6 | 164 | return AC_ERR_SYSTEM; |
338ec570 DW |
165 | task->dev = dev; |
166 | task->task_proto = SAS_PROTOCOL_STP; | |
167 | task->task_done = sas_ata_task_done; | |
168 | ||
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 */ | |
172 | qc->tf.nsect = 0; | |
173 | } | |
174 | ||
110dd8f1 | 175 | ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis); |
338ec570 DW |
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; | |
181 | } else { | |
182 | ata_for_each_sg(sg, qc) { | |
183 | num++; | |
184 | xfer += sg->length; | |
185 | } | |
186 | ||
187 | task->total_xfer_len = xfer; | |
188 | task->num_scatter = num; | |
189 | } | |
190 | ||
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; | |
1c50dc83 | 195 | qc->lldd_task = task; |
338ec570 DW |
196 | |
197 | switch (qc->tf.protocol) { | |
198 | case ATA_PROT_NCQ: | |
199 | task->ata_task.use_ncq = 1; | |
200 | /* fall through */ | |
201 | case ATA_PROT_ATAPI_DMA: | |
202 | case ATA_PROT_DMA: | |
203 | task->ata_task.dma_xfer = 1; | |
204 | break; | |
205 | } | |
206 | ||
fe059f12 DW |
207 | if (qc->scsicmd) |
208 | ASSIGN_SAS_TASK(qc->scsicmd, task); | |
209 | ||
338ec570 DW |
210 | if (sas_ha->lldd_max_execute_num < 2) |
211 | res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC); | |
212 | else | |
213 | res = sas_queue_up(task); | |
214 | ||
215 | /* Examine */ | |
216 | if (res) { | |
217 | SAS_DPRINTK("lldd_execute_task returned: %d\n", res); | |
218 | ||
fe059f12 DW |
219 | if (qc->scsicmd) |
220 | ASSIGN_SAS_TASK(qc->scsicmd, NULL); | |
338ec570 | 221 | sas_free_task(task); |
35a7f2f6 | 222 | return AC_ERR_SYSTEM; |
338ec570 DW |
223 | } |
224 | ||
35a7f2f6 | 225 | return 0; |
338ec570 DW |
226 | } |
227 | ||
228 | static u8 sas_ata_check_status(struct ata_port *ap) | |
229 | { | |
230 | struct domain_device *dev = ap->private_data; | |
231 | return dev->sata_dev.tf.command; | |
232 | } | |
233 | ||
234 | static void sas_ata_phy_reset(struct ata_port *ap) | |
235 | { | |
236 | struct domain_device *dev = ap->private_data; | |
237 | struct sas_internal *i = | |
238 | to_sas_internal(dev->port->ha->core.shost->transportt); | |
239 | int res = 0; | |
240 | ||
241 | if (i->dft->lldd_I_T_nexus_reset) | |
242 | res = i->dft->lldd_I_T_nexus_reset(dev); | |
243 | ||
244 | if (res) | |
245 | SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __FUNCTION__); | |
246 | ||
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; | |
251 | break; | |
252 | case ATAPI_COMMAND_SET: | |
253 | SAS_DPRINTK("%s: Found ATAPI device.\n", __FUNCTION__); | |
254 | ap->device[0].class = ATA_DEV_ATAPI; | |
255 | break; | |
256 | default: | |
257 | SAS_DPRINTK("%s: Unknown SATA command set: %d.\n", | |
258 | __FUNCTION__, | |
259 | dev->sata_dev.command_set); | |
5986c3d3 | 260 | ap->device[0].class = ATA_DEV_UNKNOWN; |
338ec570 DW |
261 | break; |
262 | } | |
263 | ||
264 | ap->cbl = ATA_CBL_SATA; | |
265 | } | |
266 | ||
267 | static void sas_ata_post_internal(struct ata_queued_cmd *qc) | |
268 | { | |
269 | if (qc->flags & ATA_QCFLAG_FAILED) | |
270 | qc->err_mask |= AC_ERR_OTHER; | |
271 | ||
1c50dc83 DW |
272 | if (qc->err_mask) { |
273 | /* | |
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. | |
278 | */ | |
279 | struct sas_task *task = qc->lldd_task; | |
3a2755af | 280 | unsigned long flags; |
1c50dc83 DW |
281 | |
282 | qc->lldd_task = NULL; | |
283 | if (task) { | |
3a2755af DW |
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); | |
288 | ||
1c50dc83 DW |
289 | task->uldd_task = NULL; |
290 | __sas_task_abort(task); | |
291 | } | |
1c50dc83 | 292 | } |
338ec570 DW |
293 | } |
294 | ||
295 | static void sas_ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf) | |
296 | { | |
297 | struct domain_device *dev = ap->private_data; | |
298 | memcpy(tf, &dev->sata_dev.tf, sizeof (*tf)); | |
299 | } | |
300 | ||
110dd8f1 | 301 | static int sas_ata_scr_write(struct ata_port *ap, unsigned int sc_reg_in, |
338ec570 DW |
302 | u32 val) |
303 | { | |
304 | struct domain_device *dev = ap->private_data; | |
305 | ||
306 | SAS_DPRINTK("STUB %s\n", __FUNCTION__); | |
307 | switch (sc_reg_in) { | |
308 | case SCR_STATUS: | |
309 | dev->sata_dev.sstatus = val; | |
310 | break; | |
311 | case SCR_CONTROL: | |
312 | dev->sata_dev.scontrol = val; | |
313 | break; | |
314 | case SCR_ERROR: | |
315 | dev->sata_dev.serror = val; | |
316 | break; | |
317 | case SCR_ACTIVE: | |
318 | dev->sata_dev.ap->sactive = val; | |
319 | break; | |
110dd8f1 JB |
320 | default: |
321 | return -EINVAL; | |
338ec570 | 322 | } |
110dd8f1 | 323 | return 0; |
338ec570 DW |
324 | } |
325 | ||
110dd8f1 JB |
326 | static int sas_ata_scr_read(struct ata_port *ap, unsigned int sc_reg_in, |
327 | u32 *val) | |
338ec570 DW |
328 | { |
329 | struct domain_device *dev = ap->private_data; | |
330 | ||
331 | SAS_DPRINTK("STUB %s\n", __FUNCTION__); | |
332 | switch (sc_reg_in) { | |
333 | case SCR_STATUS: | |
110dd8f1 JB |
334 | *val = dev->sata_dev.sstatus; |
335 | return 0; | |
338ec570 | 336 | case SCR_CONTROL: |
110dd8f1 JB |
337 | *val = dev->sata_dev.scontrol; |
338 | return 0; | |
338ec570 | 339 | case SCR_ERROR: |
110dd8f1 JB |
340 | *val = dev->sata_dev.serror; |
341 | return 0; | |
338ec570 | 342 | case SCR_ACTIVE: |
110dd8f1 JB |
343 | *val = dev->sata_dev.ap->sactive; |
344 | return 0; | |
338ec570 | 345 | default: |
110dd8f1 | 346 | return -EINVAL; |
338ec570 DW |
347 | } |
348 | } | |
349 | ||
350 | static struct ata_port_operations sas_sata_ops = { | |
351 | .port_disable = ata_port_disable, | |
352 | .check_status = sas_ata_check_status, | |
353 | .check_altstatus = sas_ata_check_status, | |
354 | .dev_select = ata_noop_dev_select, | |
355 | .phy_reset = sas_ata_phy_reset, | |
356 | .post_internal_cmd = sas_ata_post_internal, | |
357 | .tf_read = sas_ata_tf_read, | |
358 | .qc_prep = ata_noop_qc_prep, | |
359 | .qc_issue = sas_ata_qc_issue, | |
360 | .port_start = ata_sas_port_start, | |
361 | .port_stop = ata_sas_port_stop, | |
362 | .scr_read = sas_ata_scr_read, | |
363 | .scr_write = sas_ata_scr_write | |
364 | }; | |
365 | ||
366 | static struct ata_port_info sata_port_info = { | |
367 | .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET | | |
368 | ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ, | |
369 | .pio_mask = 0x1f, /* PIO0-4 */ | |
370 | .mwdma_mask = 0x07, /* MWDMA0-2 */ | |
371 | .udma_mask = ATA_UDMA6, | |
372 | .port_ops = &sas_sata_ops | |
373 | }; | |
374 | ||
375 | int sas_ata_init_host_and_port(struct domain_device *found_dev, | |
376 | struct scsi_target *starget) | |
377 | { | |
378 | struct Scsi_Host *shost = dev_to_shost(&starget->dev); | |
379 | struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); | |
380 | struct ata_port *ap; | |
381 | ||
382 | ata_host_init(&found_dev->sata_dev.ata_host, | |
383 | &ha->pcidev->dev, | |
384 | sata_port_info.flags, | |
385 | &sas_sata_ops); | |
386 | ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host, | |
387 | &sata_port_info, | |
388 | shost); | |
389 | if (!ap) { | |
390 | SAS_DPRINTK("ata_sas_port_alloc failed.\n"); | |
391 | return -ENODEV; | |
392 | } | |
393 | ||
394 | ap->private_data = found_dev; | |
395 | ap->cbl = ATA_CBL_SATA; | |
396 | ap->scsi_host = shost; | |
397 | found_dev->sata_dev.ap = ap; | |
398 | ||
399 | return 0; | |
400 | } | |
3a2755af DW |
401 | |
402 | void sas_ata_task_abort(struct sas_task *task) | |
403 | { | |
404 | struct ata_queued_cmd *qc = task->uldd_task; | |
405 | struct completion *waiting; | |
406 | ||
407 | /* Bounce SCSI-initiated commands to the SCSI EH */ | |
408 | if (qc->scsicmd) { | |
409 | scsi_req_abort_cmd(qc->scsicmd); | |
410 | scsi_schedule_eh(qc->scsicmd->device->host); | |
411 | return; | |
412 | } | |
413 | ||
414 | /* Internal command, fake a timeout and complete. */ | |
415 | qc->flags &= ~ATA_QCFLAG_ACTIVE; | |
416 | qc->flags |= ATA_QCFLAG_FAILED; | |
417 | qc->err_mask |= AC_ERR_TIMEOUT; | |
418 | waiting = qc->private_data; | |
419 | complete(waiting); | |
420 | } |