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2908d778 JB |
1 | /* |
2 | * Serial Attached SCSI (SAS) Discover process | |
3 | * | |
4 | * Copyright (C) 2005 Adaptec, Inc. All rights reserved. | |
5 | * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com> | |
6 | * | |
7 | * This file is licensed under GPLv2. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License as | |
11 | * published by the Free Software Foundation; either version 2 of the | |
12 | * License, or (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <linux/pci.h> | |
26 | #include <linux/scatterlist.h> | |
27 | #include <scsi/scsi_host.h> | |
28 | #include <scsi/scsi_eh.h> | |
29 | #include "sas_internal.h" | |
30 | ||
31 | #include <scsi/scsi_transport.h> | |
32 | #include <scsi/scsi_transport_sas.h> | |
33 | #include "../scsi_sas_internal.h" | |
34 | ||
35 | /* ---------- Basic task processing for discovery purposes ---------- */ | |
36 | ||
37 | void sas_init_dev(struct domain_device *dev) | |
38 | { | |
39 | INIT_LIST_HEAD(&dev->siblings); | |
40 | INIT_LIST_HEAD(&dev->dev_list_node); | |
41 | switch (dev->dev_type) { | |
42 | case SAS_END_DEV: | |
43 | break; | |
44 | case EDGE_DEV: | |
45 | case FANOUT_DEV: | |
46 | INIT_LIST_HEAD(&dev->ex_dev.children); | |
47 | break; | |
48 | case SATA_DEV: | |
49 | case SATA_PM: | |
50 | case SATA_PM_PORT: | |
51 | INIT_LIST_HEAD(&dev->sata_dev.children); | |
52 | break; | |
53 | default: | |
54 | break; | |
55 | } | |
56 | } | |
57 | ||
58 | static void sas_task_timedout(unsigned long _task) | |
59 | { | |
60 | struct sas_task *task = (void *) _task; | |
61 | unsigned long flags; | |
62 | ||
63 | spin_lock_irqsave(&task->task_state_lock, flags); | |
64 | if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) | |
65 | task->task_state_flags |= SAS_TASK_STATE_ABORTED; | |
66 | spin_unlock_irqrestore(&task->task_state_lock, flags); | |
67 | ||
68 | complete(&task->completion); | |
69 | } | |
70 | ||
71 | static void sas_disc_task_done(struct sas_task *task) | |
72 | { | |
73 | if (!del_timer(&task->timer)) | |
74 | return; | |
75 | complete(&task->completion); | |
76 | } | |
77 | ||
78 | #define SAS_DEV_TIMEOUT 10 | |
79 | ||
80 | /** | |
81 | * sas_execute_task -- Basic task processing for discovery | |
82 | * @task: the task to be executed | |
83 | * @buffer: pointer to buffer to do I/O | |
84 | * @size: size of @buffer | |
85 | * @pci_dma_dir: PCI_DMA_... | |
86 | */ | |
87 | static int sas_execute_task(struct sas_task *task, void *buffer, int size, | |
88 | int pci_dma_dir) | |
89 | { | |
90 | int res = 0; | |
91 | struct scatterlist *scatter = NULL; | |
92 | struct task_status_struct *ts = &task->task_status; | |
93 | int num_scatter = 0; | |
94 | int retries = 0; | |
95 | struct sas_internal *i = | |
96 | to_sas_internal(task->dev->port->ha->core.shost->transportt); | |
97 | ||
98 | if (pci_dma_dir != PCI_DMA_NONE) { | |
99 | scatter = kzalloc(sizeof(*scatter), GFP_KERNEL); | |
100 | if (!scatter) | |
101 | goto out; | |
102 | ||
103 | sg_init_one(scatter, buffer, size); | |
104 | num_scatter = 1; | |
105 | } | |
106 | ||
107 | task->task_proto = task->dev->tproto; | |
108 | task->scatter = scatter; | |
109 | task->num_scatter = num_scatter; | |
110 | task->total_xfer_len = size; | |
111 | task->data_dir = pci_dma_dir; | |
112 | task->task_done = sas_disc_task_done; | |
113 | ||
114 | for (retries = 0; retries < 5; retries++) { | |
115 | task->task_state_flags = SAS_TASK_STATE_PENDING; | |
116 | init_completion(&task->completion); | |
117 | ||
118 | task->timer.data = (unsigned long) task; | |
119 | task->timer.function = sas_task_timedout; | |
120 | task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ; | |
121 | add_timer(&task->timer); | |
122 | ||
123 | res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL); | |
124 | if (res) { | |
125 | del_timer(&task->timer); | |
126 | SAS_DPRINTK("executing SAS discovery task failed:%d\n", | |
127 | res); | |
128 | goto ex_err; | |
129 | } | |
130 | wait_for_completion(&task->completion); | |
131 | res = -ETASK; | |
132 | if (task->task_state_flags & SAS_TASK_STATE_ABORTED) { | |
133 | int res2; | |
134 | SAS_DPRINTK("task aborted, flags:0x%x\n", | |
135 | task->task_state_flags); | |
136 | res2 = i->dft->lldd_abort_task(task); | |
137 | SAS_DPRINTK("came back from abort task\n"); | |
138 | if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) { | |
139 | if (res2 == TMF_RESP_FUNC_COMPLETE) | |
140 | continue; /* Retry the task */ | |
141 | else | |
142 | goto ex_err; | |
143 | } | |
144 | } | |
145 | if (task->task_status.stat == SAM_BUSY || | |
146 | task->task_status.stat == SAM_TASK_SET_FULL || | |
147 | task->task_status.stat == SAS_QUEUE_FULL) { | |
148 | SAS_DPRINTK("task: q busy, sleeping...\n"); | |
149 | schedule_timeout_interruptible(HZ); | |
150 | } else if (task->task_status.stat == SAM_CHECK_COND) { | |
151 | struct scsi_sense_hdr shdr; | |
152 | ||
153 | if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size, | |
154 | &shdr)) { | |
155 | SAS_DPRINTK("couldn't normalize sense\n"); | |
156 | continue; | |
157 | } | |
158 | if ((shdr.sense_key == 6 && shdr.asc == 0x29) || | |
159 | (shdr.sense_key == 2 && shdr.asc == 4 && | |
160 | shdr.ascq == 1)) { | |
161 | SAS_DPRINTK("device %016llx LUN: %016llx " | |
162 | "powering up or not ready yet, " | |
163 | "sleeping...\n", | |
164 | SAS_ADDR(task->dev->sas_addr), | |
165 | SAS_ADDR(task->ssp_task.LUN)); | |
166 | ||
167 | schedule_timeout_interruptible(5*HZ); | |
168 | } else if (shdr.sense_key == 1) { | |
169 | res = 0; | |
170 | break; | |
171 | } else if (shdr.sense_key == 5) { | |
172 | break; | |
173 | } else { | |
174 | SAS_DPRINTK("dev %016llx LUN: %016llx " | |
175 | "sense key:0x%x ASC:0x%x ASCQ:0x%x" | |
176 | "\n", | |
177 | SAS_ADDR(task->dev->sas_addr), | |
178 | SAS_ADDR(task->ssp_task.LUN), | |
179 | shdr.sense_key, | |
180 | shdr.asc, shdr.ascq); | |
181 | } | |
182 | } else if (task->task_status.resp != SAS_TASK_COMPLETE || | |
183 | task->task_status.stat != SAM_GOOD) { | |
184 | SAS_DPRINTK("task finished with resp:0x%x, " | |
185 | "stat:0x%x\n", | |
186 | task->task_status.resp, | |
187 | task->task_status.stat); | |
188 | goto ex_err; | |
189 | } else { | |
190 | res = 0; | |
191 | break; | |
192 | } | |
193 | } | |
194 | ex_err: | |
195 | if (pci_dma_dir != PCI_DMA_NONE) | |
196 | kfree(scatter); | |
197 | out: | |
198 | return res; | |
199 | } | |
200 | ||
201 | /* ---------- Domain device discovery ---------- */ | |
202 | ||
203 | /** | |
204 | * sas_get_port_device -- Discover devices which caused port creation | |
205 | * @port: pointer to struct sas_port of interest | |
206 | * | |
207 | * Devices directly attached to a HA port, have no parent. This is | |
208 | * how we know they are (domain) "root" devices. All other devices | |
209 | * do, and should have their "parent" pointer set appropriately as | |
210 | * soon as a child device is discovered. | |
211 | */ | |
212 | static int sas_get_port_device(struct asd_sas_port *port) | |
213 | { | |
214 | unsigned long flags; | |
215 | struct asd_sas_phy *phy; | |
216 | struct sas_rphy *rphy; | |
217 | struct domain_device *dev; | |
218 | ||
219 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
220 | if (!dev) | |
221 | return -ENOMEM; | |
222 | ||
223 | spin_lock_irqsave(&port->phy_list_lock, flags); | |
224 | if (list_empty(&port->phy_list)) { | |
225 | spin_unlock_irqrestore(&port->phy_list_lock, flags); | |
226 | kfree(dev); | |
227 | return -ENODEV; | |
228 | } | |
229 | phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el); | |
230 | spin_lock(&phy->frame_rcvd_lock); | |
231 | memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd), | |
232 | (size_t)phy->frame_rcvd_size)); | |
233 | spin_unlock(&phy->frame_rcvd_lock); | |
234 | spin_unlock_irqrestore(&port->phy_list_lock, flags); | |
235 | ||
236 | if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) { | |
237 | struct dev_to_host_fis *fis = | |
238 | (struct dev_to_host_fis *) dev->frame_rcvd; | |
239 | if (fis->interrupt_reason == 1 && fis->lbal == 1 && | |
240 | fis->byte_count_low==0x69 && fis->byte_count_high == 0x96 | |
241 | && (fis->device & ~0x10) == 0) | |
242 | dev->dev_type = SATA_PM; | |
243 | else | |
244 | dev->dev_type = SATA_DEV; | |
245 | dev->tproto = SATA_PROTO; | |
246 | } else { | |
247 | struct sas_identify_frame *id = | |
248 | (struct sas_identify_frame *) dev->frame_rcvd; | |
249 | dev->dev_type = id->dev_type; | |
250 | dev->iproto = id->initiator_bits; | |
251 | dev->tproto = id->target_bits; | |
252 | } | |
253 | ||
254 | sas_init_dev(dev); | |
255 | ||
256 | switch (dev->dev_type) { | |
257 | case SAS_END_DEV: | |
258 | rphy = sas_end_device_alloc(port->port); | |
259 | break; | |
260 | case EDGE_DEV: | |
261 | rphy = sas_expander_alloc(port->port, | |
262 | SAS_EDGE_EXPANDER_DEVICE); | |
263 | break; | |
264 | case FANOUT_DEV: | |
265 | rphy = sas_expander_alloc(port->port, | |
266 | SAS_FANOUT_EXPANDER_DEVICE); | |
267 | break; | |
268 | case SATA_DEV: | |
269 | default: | |
270 | printk("ERROR: Unidentified device type %d\n", dev->dev_type); | |
271 | rphy = NULL; | |
272 | break; | |
273 | } | |
274 | ||
275 | if (!rphy) { | |
276 | kfree(dev); | |
277 | return -ENODEV; | |
278 | } | |
279 | rphy->identify.phy_identifier = phy->phy->identify.phy_identifier; | |
280 | memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE); | |
281 | sas_fill_in_rphy(dev, rphy); | |
282 | sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr); | |
283 | port->port_dev = dev; | |
284 | dev->port = port; | |
285 | dev->linkrate = port->linkrate; | |
286 | dev->min_linkrate = port->linkrate; | |
287 | dev->max_linkrate = port->linkrate; | |
288 | dev->pathways = port->num_phys; | |
289 | memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE); | |
290 | memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE); | |
291 | memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE); | |
292 | port->disc.max_level = 0; | |
293 | ||
294 | dev->rphy = rphy; | |
295 | spin_lock(&port->dev_list_lock); | |
296 | list_add_tail(&dev->dev_list_node, &port->dev_list); | |
297 | spin_unlock(&port->dev_list_lock); | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
302 | /* ---------- Discover and Revalidate ---------- */ | |
303 | ||
304 | /* ---------- SATA ---------- */ | |
305 | ||
306 | static void sas_get_ata_command_set(struct domain_device *dev) | |
307 | { | |
308 | struct dev_to_host_fis *fis = | |
309 | (struct dev_to_host_fis *) dev->frame_rcvd; | |
310 | ||
311 | if ((fis->sector_count == 1 && /* ATA */ | |
312 | fis->lbal == 1 && | |
313 | fis->lbam == 0 && | |
314 | fis->lbah == 0 && | |
315 | fis->device == 0) | |
316 | || | |
317 | (fis->sector_count == 0 && /* CE-ATA (mATA) */ | |
318 | fis->lbal == 0 && | |
319 | fis->lbam == 0xCE && | |
320 | fis->lbah == 0xAA && | |
321 | (fis->device & ~0x10) == 0)) | |
322 | ||
323 | dev->sata_dev.command_set = ATA_COMMAND_SET; | |
324 | ||
325 | else if ((fis->interrupt_reason == 1 && /* ATAPI */ | |
326 | fis->lbal == 1 && | |
327 | fis->byte_count_low == 0x14 && | |
328 | fis->byte_count_high == 0xEB && | |
329 | (fis->device & ~0x10) == 0)) | |
330 | ||
331 | dev->sata_dev.command_set = ATAPI_COMMAND_SET; | |
332 | ||
333 | else if ((fis->sector_count == 1 && /* SEMB */ | |
334 | fis->lbal == 1 && | |
335 | fis->lbam == 0x3C && | |
336 | fis->lbah == 0xC3 && | |
337 | fis->device == 0) | |
338 | || | |
339 | (fis->interrupt_reason == 1 && /* SATA PM */ | |
340 | fis->lbal == 1 && | |
341 | fis->byte_count_low == 0x69 && | |
342 | fis->byte_count_high == 0x96 && | |
343 | (fis->device & ~0x10) == 0)) | |
344 | ||
345 | /* Treat it as a superset? */ | |
346 | dev->sata_dev.command_set = ATAPI_COMMAND_SET; | |
347 | } | |
348 | ||
349 | /** | |
350 | * sas_issue_ata_cmd -- Basic SATA command processing for discovery | |
351 | * @dev: the device to send the command to | |
352 | * @command: the command register | |
353 | * @features: the features register | |
354 | * @buffer: pointer to buffer to do I/O | |
355 | * @size: size of @buffer | |
356 | * @pci_dma_dir: PCI_DMA_... | |
357 | */ | |
358 | static int sas_issue_ata_cmd(struct domain_device *dev, u8 command, | |
359 | u8 features, void *buffer, int size, | |
360 | int pci_dma_dir) | |
361 | { | |
362 | int res = 0; | |
363 | struct sas_task *task; | |
364 | struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *) | |
365 | &dev->frame_rcvd[0]; | |
366 | ||
367 | res = -ENOMEM; | |
368 | task = sas_alloc_task(GFP_KERNEL); | |
369 | if (!task) | |
370 | goto out; | |
371 | ||
372 | task->dev = dev; | |
373 | ||
374 | task->ata_task.fis.command = command; | |
375 | task->ata_task.fis.features = features; | |
376 | task->ata_task.fis.device = d2h_fis->device; | |
377 | task->ata_task.retry_count = 1; | |
378 | ||
379 | res = sas_execute_task(task, buffer, size, pci_dma_dir); | |
380 | ||
381 | sas_free_task(task); | |
382 | out: | |
383 | return res; | |
384 | } | |
385 | ||
386 | static void sas_sata_propagate_sas_addr(struct domain_device *dev) | |
387 | { | |
388 | unsigned long flags; | |
389 | struct asd_sas_port *port = dev->port; | |
390 | struct asd_sas_phy *phy; | |
391 | ||
392 | BUG_ON(dev->parent); | |
393 | ||
394 | memcpy(port->attached_sas_addr, dev->sas_addr, SAS_ADDR_SIZE); | |
395 | spin_lock_irqsave(&port->phy_list_lock, flags); | |
396 | list_for_each_entry(phy, &port->phy_list, port_phy_el) | |
397 | memcpy(phy->attached_sas_addr, dev->sas_addr, SAS_ADDR_SIZE); | |
398 | spin_unlock_irqrestore(&port->phy_list_lock, flags); | |
399 | } | |
400 | ||
401 | #define ATA_IDENTIFY_DEV 0xEC | |
402 | #define ATA_IDENTIFY_PACKET_DEV 0xA1 | |
403 | #define ATA_SET_FEATURES 0xEF | |
404 | #define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07 | |
405 | ||
406 | /** | |
407 | * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV) | |
408 | * @dev: STP/SATA device of interest (ATA/ATAPI) | |
409 | * | |
410 | * The LLDD has already been notified of this device, so that we can | |
411 | * send FISes to it. Here we try to get IDENTIFY DEVICE or IDENTIFY | |
412 | * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its | |
413 | * performance for this device. | |
414 | */ | |
415 | static int sas_discover_sata_dev(struct domain_device *dev) | |
416 | { | |
417 | int res; | |
418 | __le16 *identify_x; | |
419 | u8 command; | |
420 | ||
421 | identify_x = kzalloc(512, GFP_KERNEL); | |
422 | if (!identify_x) | |
423 | return -ENOMEM; | |
424 | ||
425 | if (dev->sata_dev.command_set == ATA_COMMAND_SET) { | |
426 | dev->sata_dev.identify_device = identify_x; | |
427 | command = ATA_IDENTIFY_DEV; | |
428 | } else { | |
429 | dev->sata_dev.identify_packet_device = identify_x; | |
430 | command = ATA_IDENTIFY_PACKET_DEV; | |
431 | } | |
432 | ||
433 | res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512, | |
434 | PCI_DMA_FROMDEVICE); | |
435 | if (res) | |
436 | goto out_err; | |
437 | ||
438 | /* lives on the media? */ | |
439 | if (le16_to_cpu(identify_x[0]) & 4) { | |
440 | /* incomplete response */ | |
441 | SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to " | |
442 | "dev %llx\n", SAS_ADDR(dev->sas_addr)); | |
443 | if (!le16_to_cpu(identify_x[83] & (1<<6))) | |
444 | goto cont1; | |
445 | res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES, | |
446 | ATA_FEATURE_PUP_STBY_SPIN_UP, | |
447 | NULL, 0, PCI_DMA_NONE); | |
448 | if (res) | |
449 | goto cont1; | |
450 | ||
451 | schedule_timeout_interruptible(5*HZ); /* More time? */ | |
452 | res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512, | |
453 | PCI_DMA_FROMDEVICE); | |
454 | if (res) | |
455 | goto out_err; | |
456 | } | |
457 | cont1: | |
458 | /* Get WWN */ | |
459 | if (dev->port->oob_mode != SATA_OOB_MODE) { | |
460 | memcpy(dev->sas_addr, dev->sata_dev.rps_resp.rps.stp_sas_addr, | |
461 | SAS_ADDR_SIZE); | |
462 | } else if (dev->sata_dev.command_set == ATA_COMMAND_SET && | |
463 | (le16_to_cpu(dev->sata_dev.identify_device[108]) & 0xF000) | |
464 | == 0x5000) { | |
465 | int i; | |
466 | ||
467 | for (i = 0; i < 4; i++) { | |
468 | dev->sas_addr[2*i] = | |
469 | (le16_to_cpu(dev->sata_dev.identify_device[108+i]) & 0xFF00) >> 8; | |
470 | dev->sas_addr[2*i+1] = | |
471 | le16_to_cpu(dev->sata_dev.identify_device[108+i]) & 0x00FF; | |
472 | } | |
473 | } | |
474 | sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr); | |
475 | if (!dev->parent) | |
476 | sas_sata_propagate_sas_addr(dev); | |
477 | ||
478 | /* XXX Hint: register this SATA device with SATL. | |
479 | When this returns, dev->sata_dev->lu is alive and | |
480 | present. | |
481 | sas_satl_register_dev(dev); | |
482 | */ | |
483 | return 0; | |
484 | out_err: | |
485 | dev->sata_dev.identify_packet_device = NULL; | |
486 | dev->sata_dev.identify_device = NULL; | |
487 | kfree(identify_x); | |
488 | return res; | |
489 | } | |
490 | ||
491 | static int sas_discover_sata_pm(struct domain_device *dev) | |
492 | { | |
493 | return -ENODEV; | |
494 | } | |
495 | ||
496 | int sas_notify_lldd_dev_found(struct domain_device *dev) | |
497 | { | |
498 | int res = 0; | |
499 | struct sas_ha_struct *sas_ha = dev->port->ha; | |
500 | struct Scsi_Host *shost = sas_ha->core.shost; | |
501 | struct sas_internal *i = to_sas_internal(shost->transportt); | |
502 | ||
503 | if (i->dft->lldd_dev_found) { | |
504 | res = i->dft->lldd_dev_found(dev); | |
505 | if (res) { | |
506 | printk("sas: driver on pcidev %s cannot handle " | |
507 | "device %llx, error:%d\n", | |
508 | pci_name(sas_ha->pcidev), | |
509 | SAS_ADDR(dev->sas_addr), res); | |
510 | } | |
511 | } | |
512 | return res; | |
513 | } | |
514 | ||
515 | ||
516 | void sas_notify_lldd_dev_gone(struct domain_device *dev) | |
517 | { | |
518 | struct sas_ha_struct *sas_ha = dev->port->ha; | |
519 | struct Scsi_Host *shost = sas_ha->core.shost; | |
520 | struct sas_internal *i = to_sas_internal(shost->transportt); | |
521 | ||
522 | if (i->dft->lldd_dev_gone) | |
523 | i->dft->lldd_dev_gone(dev); | |
524 | } | |
525 | ||
526 | /* ---------- Common/dispatchers ---------- */ | |
527 | ||
528 | /** | |
529 | * sas_discover_sata -- discover an STP/SATA domain device | |
530 | * @dev: pointer to struct domain_device of interest | |
531 | * | |
532 | * First we notify the LLDD of this device, so we can send frames to | |
533 | * it. Then depending on the type of device we call the appropriate | |
534 | * discover functions. Once device discover is done, we notify the | |
535 | * LLDD so that it can fine-tune its parameters for the device, by | |
536 | * removing it and then adding it. That is, the second time around, | |
537 | * the driver would have certain fields, that it is looking at, set. | |
538 | * Finally we initialize the kobj so that the device can be added to | |
539 | * the system at registration time. Devices directly attached to a HA | |
540 | * port, have no parents. All other devices do, and should have their | |
541 | * "parent" pointer set appropriately before calling this function. | |
542 | */ | |
543 | int sas_discover_sata(struct domain_device *dev) | |
544 | { | |
545 | int res; | |
546 | ||
547 | sas_get_ata_command_set(dev); | |
548 | ||
549 | res = sas_notify_lldd_dev_found(dev); | |
550 | if (res) | |
551 | return res; | |
552 | ||
553 | switch (dev->dev_type) { | |
554 | case SATA_DEV: | |
555 | res = sas_discover_sata_dev(dev); | |
556 | break; | |
557 | case SATA_PM: | |
558 | res = sas_discover_sata_pm(dev); | |
559 | break; | |
560 | default: | |
561 | break; | |
562 | } | |
563 | ||
564 | sas_notify_lldd_dev_gone(dev); | |
565 | if (!res) { | |
566 | sas_notify_lldd_dev_found(dev); | |
567 | } | |
568 | return res; | |
569 | } | |
570 | ||
571 | /** | |
572 | * sas_discover_end_dev -- discover an end device (SSP, etc) | |
573 | * @end: pointer to domain device of interest | |
574 | * | |
575 | * See comment in sas_discover_sata(). | |
576 | */ | |
577 | int sas_discover_end_dev(struct domain_device *dev) | |
578 | { | |
579 | int res; | |
580 | ||
581 | res = sas_notify_lldd_dev_found(dev); | |
582 | if (res) | |
583 | return res; | |
584 | ||
585 | res = sas_rphy_add(dev->rphy); | |
586 | if (res) | |
587 | goto out_err; | |
588 | ||
589 | /* do this to get the end device port attributes which will have | |
590 | * been scanned in sas_rphy_add */ | |
591 | sas_notify_lldd_dev_gone(dev); | |
592 | sas_notify_lldd_dev_found(dev); | |
593 | ||
594 | return 0; | |
595 | ||
596 | out_err: | |
597 | sas_notify_lldd_dev_gone(dev); | |
598 | return res; | |
599 | } | |
600 | ||
601 | /* ---------- Device registration and unregistration ---------- */ | |
602 | ||
603 | static inline void sas_unregister_common_dev(struct domain_device *dev) | |
604 | { | |
605 | sas_notify_lldd_dev_gone(dev); | |
606 | if (!dev->parent) | |
607 | dev->port->port_dev = NULL; | |
608 | else | |
609 | list_del_init(&dev->siblings); | |
610 | list_del_init(&dev->dev_list_node); | |
611 | } | |
612 | ||
613 | void sas_unregister_dev(struct domain_device *dev) | |
614 | { | |
615 | if (dev->rphy) { | |
616 | sas_remove_children(&dev->rphy->dev); | |
617 | sas_rphy_delete(dev->rphy); | |
618 | dev->rphy = NULL; | |
619 | } | |
620 | if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV) { | |
621 | /* remove the phys and ports, everything else should be gone */ | |
622 | kfree(dev->ex_dev.ex_phy); | |
623 | dev->ex_dev.ex_phy = NULL; | |
624 | } | |
625 | sas_unregister_common_dev(dev); | |
626 | } | |
627 | ||
628 | void sas_unregister_domain_devices(struct asd_sas_port *port) | |
629 | { | |
630 | struct domain_device *dev, *n; | |
631 | ||
632 | list_for_each_entry_safe_reverse(dev,n,&port->dev_list,dev_list_node) | |
633 | sas_unregister_dev(dev); | |
634 | ||
635 | port->port->rphy = NULL; | |
636 | ||
637 | } | |
638 | ||
639 | /* ---------- Discovery and Revalidation ---------- */ | |
640 | ||
641 | /** | |
642 | * sas_discover_domain -- discover the domain | |
643 | * @port: port to the domain of interest | |
644 | * | |
645 | * NOTE: this process _must_ quit (return) as soon as any connection | |
646 | * errors are encountered. Connection recovery is done elsewhere. | |
647 | * Discover process only interrogates devices in order to discover the | |
648 | * domain. | |
649 | */ | |
c4028958 | 650 | static void sas_discover_domain(struct work_struct *work) |
2908d778 JB |
651 | { |
652 | int error = 0; | |
c4028958 DH |
653 | struct sas_discovery_event *ev = |
654 | container_of(work, struct sas_discovery_event, work); | |
655 | struct asd_sas_port *port = ev->port; | |
2908d778 JB |
656 | |
657 | sas_begin_event(DISCE_DISCOVER_DOMAIN, &port->disc.disc_event_lock, | |
658 | &port->disc.pending); | |
659 | ||
660 | if (port->port_dev) | |
661 | return ; | |
662 | else { | |
663 | error = sas_get_port_device(port); | |
664 | if (error) | |
665 | return; | |
666 | } | |
667 | ||
668 | SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id, | |
669 | current->pid); | |
670 | ||
671 | switch (port->port_dev->dev_type) { | |
672 | case SAS_END_DEV: | |
673 | error = sas_discover_end_dev(port->port_dev); | |
674 | break; | |
675 | case EDGE_DEV: | |
676 | case FANOUT_DEV: | |
677 | error = sas_discover_root_expander(port->port_dev); | |
678 | break; | |
679 | case SATA_DEV: | |
680 | case SATA_PM: | |
681 | error = sas_discover_sata(port->port_dev); | |
682 | break; | |
683 | default: | |
684 | SAS_DPRINTK("unhandled device %d\n", port->port_dev->dev_type); | |
685 | break; | |
686 | } | |
687 | ||
688 | if (error) { | |
689 | kfree(port->port_dev); /* not kobject_register-ed yet */ | |
690 | port->port_dev = NULL; | |
691 | } | |
692 | ||
693 | SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id, | |
694 | current->pid, error); | |
695 | } | |
696 | ||
c4028958 | 697 | static void sas_revalidate_domain(struct work_struct *work) |
2908d778 JB |
698 | { |
699 | int res = 0; | |
c4028958 DH |
700 | struct sas_discovery_event *ev = |
701 | container_of(work, struct sas_discovery_event, work); | |
702 | struct asd_sas_port *port = ev->port; | |
2908d778 JB |
703 | |
704 | sas_begin_event(DISCE_REVALIDATE_DOMAIN, &port->disc.disc_event_lock, | |
705 | &port->disc.pending); | |
706 | ||
707 | SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id, | |
708 | current->pid); | |
709 | if (port->port_dev) | |
710 | res = sas_ex_revalidate_domain(port->port_dev); | |
711 | ||
712 | SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n", | |
713 | port->id, current->pid, res); | |
714 | } | |
715 | ||
716 | /* ---------- Events ---------- */ | |
717 | ||
718 | int sas_discover_event(struct asd_sas_port *port, enum discover_event ev) | |
719 | { | |
720 | struct sas_discovery *disc; | |
721 | ||
722 | if (!port) | |
723 | return 0; | |
724 | disc = &port->disc; | |
725 | ||
726 | BUG_ON(ev >= DISC_NUM_EVENTS); | |
727 | ||
728 | sas_queue_event(ev, &disc->disc_event_lock, &disc->pending, | |
c4028958 | 729 | &disc->disc_work[ev].work, port->ha->core.shost); |
2908d778 JB |
730 | |
731 | return 0; | |
732 | } | |
733 | ||
734 | /** | |
735 | * sas_init_disc -- initialize the discovery struct in the port | |
736 | * @port: pointer to struct port | |
737 | * | |
738 | * Called when the ports are being initialized. | |
739 | */ | |
740 | void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port) | |
741 | { | |
742 | int i; | |
743 | ||
c4028958 | 744 | static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = { |
2908d778 JB |
745 | [DISCE_DISCOVER_DOMAIN] = sas_discover_domain, |
746 | [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain, | |
747 | }; | |
748 | ||
749 | spin_lock_init(&disc->disc_event_lock); | |
750 | disc->pending = 0; | |
c4028958 DH |
751 | for (i = 0; i < DISC_NUM_EVENTS; i++) { |
752 | INIT_WORK(&disc->disc_work[i].work, sas_event_fns[i]); | |
753 | disc->disc_work[i].port = port; | |
754 | } | |
2908d778 | 755 | } |