1 /*
2  * Marvell 88SE64xx/88SE94xx main function
3  *
4  * Copyright 2007 Red Hat, Inc.
5  * Copyright 2008 Marvell. <kewei@marvell.com>
6  * Copyright 2009-2011 Marvell. <yuxiangl@marvell.com>
7  *
8  * This file is licensed under GPLv2.
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public License as
12  * published by the Free Software Foundation; version 2 of the
13  * License.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  * General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
23  * USA
24 */
25 
26 #include "mv_sas.h"
27 
mvs_find_tag(struct mvs_info * mvi,struct sas_task * task,u32 * tag)28 static int mvs_find_tag(struct mvs_info *mvi, struct sas_task *task, u32 *tag)
29 {
30 	if (task->lldd_task) {
31 		struct mvs_slot_info *slot;
32 		slot = task->lldd_task;
33 		*tag = slot->slot_tag;
34 		return 1;
35 	}
36 	return 0;
37 }
38 
mvs_tag_clear(struct mvs_info * mvi,u32 tag)39 void mvs_tag_clear(struct mvs_info *mvi, u32 tag)
40 {
41 	void *bitmap = mvi->tags;
42 	clear_bit(tag, bitmap);
43 }
44 
mvs_tag_free(struct mvs_info * mvi,u32 tag)45 void mvs_tag_free(struct mvs_info *mvi, u32 tag)
46 {
47 	mvs_tag_clear(mvi, tag);
48 }
49 
mvs_tag_set(struct mvs_info * mvi,unsigned int tag)50 void mvs_tag_set(struct mvs_info *mvi, unsigned int tag)
51 {
52 	void *bitmap = mvi->tags;
53 	set_bit(tag, bitmap);
54 }
55 
mvs_tag_alloc(struct mvs_info * mvi,u32 * tag_out)56 inline int mvs_tag_alloc(struct mvs_info *mvi, u32 *tag_out)
57 {
58 	unsigned int index, tag;
59 	void *bitmap = mvi->tags;
60 
61 	index = find_first_zero_bit(bitmap, mvi->tags_num);
62 	tag = index;
63 	if (tag >= mvi->tags_num)
64 		return -SAS_QUEUE_FULL;
65 	mvs_tag_set(mvi, tag);
66 	*tag_out = tag;
67 	return 0;
68 }
69 
mvs_tag_init(struct mvs_info * mvi)70 void mvs_tag_init(struct mvs_info *mvi)
71 {
72 	int i;
73 	for (i = 0; i < mvi->tags_num; ++i)
74 		mvs_tag_clear(mvi, i);
75 }
76 
mvs_find_dev_mvi(struct domain_device * dev)77 struct mvs_info *mvs_find_dev_mvi(struct domain_device *dev)
78 {
79 	unsigned long i = 0, j = 0, hi = 0;
80 	struct sas_ha_struct *sha = dev->port->ha;
81 	struct mvs_info *mvi = NULL;
82 	struct asd_sas_phy *phy;
83 
84 	while (sha->sas_port[i]) {
85 		if (sha->sas_port[i] == dev->port) {
86 			phy =  container_of(sha->sas_port[i]->phy_list.next,
87 				struct asd_sas_phy, port_phy_el);
88 			j = 0;
89 			while (sha->sas_phy[j]) {
90 				if (sha->sas_phy[j] == phy)
91 					break;
92 				j++;
93 			}
94 			break;
95 		}
96 		i++;
97 	}
98 	hi = j/((struct mvs_prv_info *)sha->lldd_ha)->n_phy;
99 	mvi = ((struct mvs_prv_info *)sha->lldd_ha)->mvi[hi];
100 
101 	return mvi;
102 
103 }
104 
mvs_find_dev_phyno(struct domain_device * dev,int * phyno)105 int mvs_find_dev_phyno(struct domain_device *dev, int *phyno)
106 {
107 	unsigned long i = 0, j = 0, n = 0, num = 0;
108 	struct mvs_device *mvi_dev = (struct mvs_device *)dev->lldd_dev;
109 	struct mvs_info *mvi = mvi_dev->mvi_info;
110 	struct sas_ha_struct *sha = dev->port->ha;
111 
112 	while (sha->sas_port[i]) {
113 		if (sha->sas_port[i] == dev->port) {
114 			struct asd_sas_phy *phy;
115 			list_for_each_entry(phy,
116 				&sha->sas_port[i]->phy_list, port_phy_el) {
117 				j = 0;
118 				while (sha->sas_phy[j]) {
119 					if (sha->sas_phy[j] == phy)
120 						break;
121 					j++;
122 				}
123 				phyno[n] = (j >= mvi->chip->n_phy) ?
124 					(j - mvi->chip->n_phy) : j;
125 				num++;
126 				n++;
127 			}
128 			break;
129 		}
130 		i++;
131 	}
132 	return num;
133 }
134 
mvs_find_dev_by_reg_set(struct mvs_info * mvi,u8 reg_set)135 struct mvs_device *mvs_find_dev_by_reg_set(struct mvs_info *mvi,
136 						u8 reg_set)
137 {
138 	u32 dev_no;
139 	for (dev_no = 0; dev_no < MVS_MAX_DEVICES; dev_no++) {
140 		if (mvi->devices[dev_no].taskfileset == MVS_ID_NOT_MAPPED)
141 			continue;
142 
143 		if (mvi->devices[dev_no].taskfileset == reg_set)
144 			return &mvi->devices[dev_no];
145 	}
146 	return NULL;
147 }
148 
mvs_free_reg_set(struct mvs_info * mvi,struct mvs_device * dev)149 static inline void mvs_free_reg_set(struct mvs_info *mvi,
150 				struct mvs_device *dev)
151 {
152 	if (!dev) {
153 		mv_printk("device has been free.\n");
154 		return;
155 	}
156 	if (dev->taskfileset == MVS_ID_NOT_MAPPED)
157 		return;
158 	MVS_CHIP_DISP->free_reg_set(mvi, &dev->taskfileset);
159 }
160 
mvs_assign_reg_set(struct mvs_info * mvi,struct mvs_device * dev)161 static inline u8 mvs_assign_reg_set(struct mvs_info *mvi,
162 				struct mvs_device *dev)
163 {
164 	if (dev->taskfileset != MVS_ID_NOT_MAPPED)
165 		return 0;
166 	return MVS_CHIP_DISP->assign_reg_set(mvi, &dev->taskfileset);
167 }
168 
mvs_phys_reset(struct mvs_info * mvi,u32 phy_mask,int hard)169 void mvs_phys_reset(struct mvs_info *mvi, u32 phy_mask, int hard)
170 {
171 	u32 no;
172 	for_each_phy(phy_mask, phy_mask, no) {
173 		if (!(phy_mask & 1))
174 			continue;
175 		MVS_CHIP_DISP->phy_reset(mvi, no, hard);
176 	}
177 }
178 
mvs_phy_control(struct asd_sas_phy * sas_phy,enum phy_func func,void * funcdata)179 int mvs_phy_control(struct asd_sas_phy *sas_phy, enum phy_func func,
180 			void *funcdata)
181 {
182 	int rc = 0, phy_id = sas_phy->id;
183 	u32 tmp, i = 0, hi;
184 	struct sas_ha_struct *sha = sas_phy->ha;
185 	struct mvs_info *mvi = NULL;
186 
187 	while (sha->sas_phy[i]) {
188 		if (sha->sas_phy[i] == sas_phy)
189 			break;
190 		i++;
191 	}
192 	hi = i/((struct mvs_prv_info *)sha->lldd_ha)->n_phy;
193 	mvi = ((struct mvs_prv_info *)sha->lldd_ha)->mvi[hi];
194 
195 	switch (func) {
196 	case PHY_FUNC_SET_LINK_RATE:
197 		MVS_CHIP_DISP->phy_set_link_rate(mvi, phy_id, funcdata);
198 		break;
199 
200 	case PHY_FUNC_HARD_RESET:
201 		tmp = MVS_CHIP_DISP->read_phy_ctl(mvi, phy_id);
202 		if (tmp & PHY_RST_HARD)
203 			break;
204 		MVS_CHIP_DISP->phy_reset(mvi, phy_id, MVS_HARD_RESET);
205 		break;
206 
207 	case PHY_FUNC_LINK_RESET:
208 		MVS_CHIP_DISP->phy_enable(mvi, phy_id);
209 		MVS_CHIP_DISP->phy_reset(mvi, phy_id, MVS_SOFT_RESET);
210 		break;
211 
212 	case PHY_FUNC_DISABLE:
213 		MVS_CHIP_DISP->phy_disable(mvi, phy_id);
214 		break;
215 	case PHY_FUNC_RELEASE_SPINUP_HOLD:
216 	default:
217 		rc = -ENOSYS;
218 	}
219 	msleep(200);
220 	return rc;
221 }
222 
mvs_set_sas_addr(struct mvs_info * mvi,int port_id,u32 off_lo,u32 off_hi,u64 sas_addr)223 void __devinit mvs_set_sas_addr(struct mvs_info *mvi, int port_id,
224 				u32 off_lo, u32 off_hi, u64 sas_addr)
225 {
226 	u32 lo = (u32)sas_addr;
227 	u32 hi = (u32)(sas_addr>>32);
228 
229 	MVS_CHIP_DISP->write_port_cfg_addr(mvi, port_id, off_lo);
230 	MVS_CHIP_DISP->write_port_cfg_data(mvi, port_id, lo);
231 	MVS_CHIP_DISP->write_port_cfg_addr(mvi, port_id, off_hi);
232 	MVS_CHIP_DISP->write_port_cfg_data(mvi, port_id, hi);
233 }
234 
mvs_bytes_dmaed(struct mvs_info * mvi,int i)235 static void mvs_bytes_dmaed(struct mvs_info *mvi, int i)
236 {
237 	struct mvs_phy *phy = &mvi->phy[i];
238 	struct asd_sas_phy *sas_phy = &phy->sas_phy;
239 	struct sas_ha_struct *sas_ha;
240 	if (!phy->phy_attached)
241 		return;
242 
243 	if (!(phy->att_dev_info & PORT_DEV_TRGT_MASK)
244 		&& phy->phy_type & PORT_TYPE_SAS) {
245 		return;
246 	}
247 
248 	sas_ha = mvi->sas;
249 	sas_ha->notify_phy_event(sas_phy, PHYE_OOB_DONE);
250 
251 	if (sas_phy->phy) {
252 		struct sas_phy *sphy = sas_phy->phy;
253 
254 		sphy->negotiated_linkrate = sas_phy->linkrate;
255 		sphy->minimum_linkrate = phy->minimum_linkrate;
256 		sphy->minimum_linkrate_hw = SAS_LINK_RATE_1_5_GBPS;
257 		sphy->maximum_linkrate = phy->maximum_linkrate;
258 		sphy->maximum_linkrate_hw = MVS_CHIP_DISP->phy_max_link_rate();
259 	}
260 
261 	if (phy->phy_type & PORT_TYPE_SAS) {
262 		struct sas_identify_frame *id;
263 
264 		id = (struct sas_identify_frame *)phy->frame_rcvd;
265 		id->dev_type = phy->identify.device_type;
266 		id->initiator_bits = SAS_PROTOCOL_ALL;
267 		id->target_bits = phy->identify.target_port_protocols;
268 
269 		/* direct attached SAS device */
270 		if (phy->att_dev_info & PORT_SSP_TRGT_MASK) {
271 			MVS_CHIP_DISP->write_port_cfg_addr(mvi, i, PHYR_PHY_STAT);
272 			MVS_CHIP_DISP->write_port_cfg_data(mvi, i, 0x00);
273 		}
274 	} else if (phy->phy_type & PORT_TYPE_SATA) {
275 		/*Nothing*/
276 	}
277 	mv_dprintk("phy %d byte dmaded.\n", i + mvi->id * mvi->chip->n_phy);
278 
279 	sas_phy->frame_rcvd_size = phy->frame_rcvd_size;
280 
281 	mvi->sas->notify_port_event(sas_phy,
282 				   PORTE_BYTES_DMAED);
283 }
284 
mvs_scan_start(struct Scsi_Host * shost)285 void mvs_scan_start(struct Scsi_Host *shost)
286 {
287 	int i, j;
288 	unsigned short core_nr;
289 	struct mvs_info *mvi;
290 	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
291 	struct mvs_prv_info *mvs_prv = sha->lldd_ha;
292 
293 	core_nr = ((struct mvs_prv_info *)sha->lldd_ha)->n_host;
294 
295 	for (j = 0; j < core_nr; j++) {
296 		mvi = ((struct mvs_prv_info *)sha->lldd_ha)->mvi[j];
297 		for (i = 0; i < mvi->chip->n_phy; ++i)
298 			mvs_bytes_dmaed(mvi, i);
299 	}
300 	mvs_prv->scan_finished = 1;
301 }
302 
mvs_scan_finished(struct Scsi_Host * shost,unsigned long time)303 int mvs_scan_finished(struct Scsi_Host *shost, unsigned long time)
304 {
305 	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
306 	struct mvs_prv_info *mvs_prv = sha->lldd_ha;
307 
308 	if (mvs_prv->scan_finished == 0)
309 		return 0;
310 
311 	sas_drain_work(sha);
312 	return 1;
313 }
314 
mvs_task_prep_smp(struct mvs_info * mvi,struct mvs_task_exec_info * tei)315 static int mvs_task_prep_smp(struct mvs_info *mvi,
316 			     struct mvs_task_exec_info *tei)
317 {
318 	int elem, rc, i;
319 	struct sas_task *task = tei->task;
320 	struct mvs_cmd_hdr *hdr = tei->hdr;
321 	struct domain_device *dev = task->dev;
322 	struct asd_sas_port *sas_port = dev->port;
323 	struct scatterlist *sg_req, *sg_resp;
324 	u32 req_len, resp_len, tag = tei->tag;
325 	void *buf_tmp;
326 	u8 *buf_oaf;
327 	dma_addr_t buf_tmp_dma;
328 	void *buf_prd;
329 	struct mvs_slot_info *slot = &mvi->slot_info[tag];
330 	u32 flags = (tei->n_elem << MCH_PRD_LEN_SHIFT);
331 
332 	/*
333 	 * DMA-map SMP request, response buffers
334 	 */
335 	sg_req = &task->smp_task.smp_req;
336 	elem = dma_map_sg(mvi->dev, sg_req, 1, PCI_DMA_TODEVICE);
337 	if (!elem)
338 		return -ENOMEM;
339 	req_len = sg_dma_len(sg_req);
340 
341 	sg_resp = &task->smp_task.smp_resp;
342 	elem = dma_map_sg(mvi->dev, sg_resp, 1, PCI_DMA_FROMDEVICE);
343 	if (!elem) {
344 		rc = -ENOMEM;
345 		goto err_out;
346 	}
347 	resp_len = SB_RFB_MAX;
348 
349 	/* must be in dwords */
350 	if ((req_len & 0x3) || (resp_len & 0x3)) {
351 		rc = -EINVAL;
352 		goto err_out_2;
353 	}
354 
355 	/*
356 	 * arrange MVS_SLOT_BUF_SZ-sized DMA buffer according to our needs
357 	 */
358 
359 	/* region 1: command table area (MVS_SSP_CMD_SZ bytes) ***** */
360 	buf_tmp = slot->buf;
361 	buf_tmp_dma = slot->buf_dma;
362 
363 	hdr->cmd_tbl = cpu_to_le64(sg_dma_address(sg_req));
364 
365 	/* region 2: open address frame area (MVS_OAF_SZ bytes) ********* */
366 	buf_oaf = buf_tmp;
367 	hdr->open_frame = cpu_to_le64(buf_tmp_dma);
368 
369 	buf_tmp += MVS_OAF_SZ;
370 	buf_tmp_dma += MVS_OAF_SZ;
371 
372 	/* region 3: PRD table *********************************** */
373 	buf_prd = buf_tmp;
374 	if (tei->n_elem)
375 		hdr->prd_tbl = cpu_to_le64(buf_tmp_dma);
376 	else
377 		hdr->prd_tbl = 0;
378 
379 	i = MVS_CHIP_DISP->prd_size() * tei->n_elem;
380 	buf_tmp += i;
381 	buf_tmp_dma += i;
382 
383 	/* region 4: status buffer (larger the PRD, smaller this buf) ****** */
384 	slot->response = buf_tmp;
385 	hdr->status_buf = cpu_to_le64(buf_tmp_dma);
386 	if (mvi->flags & MVF_FLAG_SOC)
387 		hdr->reserved[0] = 0;
388 
389 	/*
390 	 * Fill in TX ring and command slot header
391 	 */
392 	slot->tx = mvi->tx_prod;
393 	mvi->tx[mvi->tx_prod] = cpu_to_le32((TXQ_CMD_SMP << TXQ_CMD_SHIFT) |
394 					TXQ_MODE_I | tag |
395 					(sas_port->phy_mask << TXQ_PHY_SHIFT));
396 
397 	hdr->flags |= flags;
398 	hdr->lens = cpu_to_le32(((resp_len / 4) << 16) | ((req_len - 4) / 4));
399 	hdr->tags = cpu_to_le32(tag);
400 	hdr->data_len = 0;
401 
402 	/* generate open address frame hdr (first 12 bytes) */
403 	/* initiator, SMP, ftype 1h */
404 	buf_oaf[0] = (1 << 7) | (PROTOCOL_SMP << 4) | 0x01;
405 	buf_oaf[1] = min(sas_port->linkrate, dev->linkrate) & 0xf;
406 	*(u16 *)(buf_oaf + 2) = 0xFFFF;		/* SAS SPEC */
407 	memcpy(buf_oaf + 4, dev->sas_addr, SAS_ADDR_SIZE);
408 
409 	/* fill in PRD (scatter/gather) table, if any */
410 	MVS_CHIP_DISP->make_prd(task->scatter, tei->n_elem, buf_prd);
411 
412 	return 0;
413 
414 err_out_2:
415 	dma_unmap_sg(mvi->dev, &tei->task->smp_task.smp_resp, 1,
416 		     PCI_DMA_FROMDEVICE);
417 err_out:
418 	dma_unmap_sg(mvi->dev, &tei->task->smp_task.smp_req, 1,
419 		     PCI_DMA_TODEVICE);
420 	return rc;
421 }
422 
mvs_get_ncq_tag(struct sas_task * task,u32 * tag)423 static u32 mvs_get_ncq_tag(struct sas_task *task, u32 *tag)
424 {
425 	struct ata_queued_cmd *qc = task->uldd_task;
426 
427 	if (qc) {
428 		if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
429 			qc->tf.command == ATA_CMD_FPDMA_READ) {
430 			*tag = qc->tag;
431 			return 1;
432 		}
433 	}
434 
435 	return 0;
436 }
437 
mvs_task_prep_ata(struct mvs_info * mvi,struct mvs_task_exec_info * tei)438 static int mvs_task_prep_ata(struct mvs_info *mvi,
439 			     struct mvs_task_exec_info *tei)
440 {
441 	struct sas_task *task = tei->task;
442 	struct domain_device *dev = task->dev;
443 	struct mvs_device *mvi_dev = dev->lldd_dev;
444 	struct mvs_cmd_hdr *hdr = tei->hdr;
445 	struct asd_sas_port *sas_port = dev->port;
446 	struct mvs_slot_info *slot;
447 	void *buf_prd;
448 	u32 tag = tei->tag, hdr_tag;
449 	u32 flags, del_q;
450 	void *buf_tmp;
451 	u8 *buf_cmd, *buf_oaf;
452 	dma_addr_t buf_tmp_dma;
453 	u32 i, req_len, resp_len;
454 	const u32 max_resp_len = SB_RFB_MAX;
455 
456 	if (mvs_assign_reg_set(mvi, mvi_dev) == MVS_ID_NOT_MAPPED) {
457 		mv_dprintk("Have not enough regiset for dev %d.\n",
458 			mvi_dev->device_id);
459 		return -EBUSY;
460 	}
461 	slot = &mvi->slot_info[tag];
462 	slot->tx = mvi->tx_prod;
463 	del_q = TXQ_MODE_I | tag |
464 		(TXQ_CMD_STP << TXQ_CMD_SHIFT) |
465 		(sas_port->phy_mask << TXQ_PHY_SHIFT) |
466 		(mvi_dev->taskfileset << TXQ_SRS_SHIFT);
467 	mvi->tx[mvi->tx_prod] = cpu_to_le32(del_q);
468 
469 	if (task->data_dir == DMA_FROM_DEVICE)
470 		flags = (MVS_CHIP_DISP->prd_count() << MCH_PRD_LEN_SHIFT);
471 	else
472 		flags = (tei->n_elem << MCH_PRD_LEN_SHIFT);
473 
474 	if (task->ata_task.use_ncq)
475 		flags |= MCH_FPDMA;
476 	if (dev->sata_dev.command_set == ATAPI_COMMAND_SET) {
477 		if (task->ata_task.fis.command != ATA_CMD_ID_ATAPI)
478 			flags |= MCH_ATAPI;
479 	}
480 
481 	hdr->flags = cpu_to_le32(flags);
482 
483 	if (task->ata_task.use_ncq && mvs_get_ncq_tag(task, &hdr_tag))
484 		task->ata_task.fis.sector_count |= (u8) (hdr_tag << 3);
485 	else
486 		hdr_tag = tag;
487 
488 	hdr->tags = cpu_to_le32(hdr_tag);
489 
490 	hdr->data_len = cpu_to_le32(task->total_xfer_len);
491 
492 	/*
493 	 * arrange MVS_SLOT_BUF_SZ-sized DMA buffer according to our needs
494 	 */
495 
496 	/* region 1: command table area (MVS_ATA_CMD_SZ bytes) ************** */
497 	buf_cmd = buf_tmp = slot->buf;
498 	buf_tmp_dma = slot->buf_dma;
499 
500 	hdr->cmd_tbl = cpu_to_le64(buf_tmp_dma);
501 
502 	buf_tmp += MVS_ATA_CMD_SZ;
503 	buf_tmp_dma += MVS_ATA_CMD_SZ;
504 
505 	/* region 2: open address frame area (MVS_OAF_SZ bytes) ********* */
506 	/* used for STP.  unused for SATA? */
507 	buf_oaf = buf_tmp;
508 	hdr->open_frame = cpu_to_le64(buf_tmp_dma);
509 
510 	buf_tmp += MVS_OAF_SZ;
511 	buf_tmp_dma += MVS_OAF_SZ;
512 
513 	/* region 3: PRD table ********************************************* */
514 	buf_prd = buf_tmp;
515 
516 	if (tei->n_elem)
517 		hdr->prd_tbl = cpu_to_le64(buf_tmp_dma);
518 	else
519 		hdr->prd_tbl = 0;
520 	i = MVS_CHIP_DISP->prd_size() * MVS_CHIP_DISP->prd_count();
521 
522 	buf_tmp += i;
523 	buf_tmp_dma += i;
524 
525 	/* region 4: status buffer (larger the PRD, smaller this buf) ****** */
526 	slot->response = buf_tmp;
527 	hdr->status_buf = cpu_to_le64(buf_tmp_dma);
528 	if (mvi->flags & MVF_FLAG_SOC)
529 		hdr->reserved[0] = 0;
530 
531 	req_len = sizeof(struct host_to_dev_fis);
532 	resp_len = MVS_SLOT_BUF_SZ - MVS_ATA_CMD_SZ -
533 	    sizeof(struct mvs_err_info) - i;
534 
535 	/* request, response lengths */
536 	resp_len = min(resp_len, max_resp_len);
537 	hdr->lens = cpu_to_le32(((resp_len / 4) << 16) | (req_len / 4));
538 
539 	if (likely(!task->ata_task.device_control_reg_update))
540 		task->ata_task.fis.flags |= 0x80; /* C=1: update ATA cmd reg */
541 	/* fill in command FIS and ATAPI CDB */
542 	memcpy(buf_cmd, &task->ata_task.fis, sizeof(struct host_to_dev_fis));
543 	if (dev->sata_dev.command_set == ATAPI_COMMAND_SET)
544 		memcpy(buf_cmd + STP_ATAPI_CMD,
545 			task->ata_task.atapi_packet, 16);
546 
547 	/* generate open address frame hdr (first 12 bytes) */
548 	/* initiator, STP, ftype 1h */
549 	buf_oaf[0] = (1 << 7) | (PROTOCOL_STP << 4) | 0x1;
550 	buf_oaf[1] = min(sas_port->linkrate, dev->linkrate) & 0xf;
551 	*(u16 *)(buf_oaf + 2) = cpu_to_be16(mvi_dev->device_id + 1);
552 	memcpy(buf_oaf + 4, dev->sas_addr, SAS_ADDR_SIZE);
553 
554 	/* fill in PRD (scatter/gather) table, if any */
555 	MVS_CHIP_DISP->make_prd(task->scatter, tei->n_elem, buf_prd);
556 
557 	if (task->data_dir == DMA_FROM_DEVICE)
558 		MVS_CHIP_DISP->dma_fix(mvi, sas_port->phy_mask,
559 				TRASH_BUCKET_SIZE, tei->n_elem, buf_prd);
560 
561 	return 0;
562 }
563 
mvs_task_prep_ssp(struct mvs_info * mvi,struct mvs_task_exec_info * tei,int is_tmf,struct mvs_tmf_task * tmf)564 static int mvs_task_prep_ssp(struct mvs_info *mvi,
565 			     struct mvs_task_exec_info *tei, int is_tmf,
566 			     struct mvs_tmf_task *tmf)
567 {
568 	struct sas_task *task = tei->task;
569 	struct mvs_cmd_hdr *hdr = tei->hdr;
570 	struct mvs_port *port = tei->port;
571 	struct domain_device *dev = task->dev;
572 	struct mvs_device *mvi_dev = dev->lldd_dev;
573 	struct asd_sas_port *sas_port = dev->port;
574 	struct mvs_slot_info *slot;
575 	void *buf_prd;
576 	struct ssp_frame_hdr *ssp_hdr;
577 	void *buf_tmp;
578 	u8 *buf_cmd, *buf_oaf, fburst = 0;
579 	dma_addr_t buf_tmp_dma;
580 	u32 flags;
581 	u32 resp_len, req_len, i, tag = tei->tag;
582 	const u32 max_resp_len = SB_RFB_MAX;
583 	u32 phy_mask;
584 
585 	slot = &mvi->slot_info[tag];
586 
587 	phy_mask = ((port->wide_port_phymap) ? port->wide_port_phymap :
588 		sas_port->phy_mask) & TXQ_PHY_MASK;
589 
590 	slot->tx = mvi->tx_prod;
591 	mvi->tx[mvi->tx_prod] = cpu_to_le32(TXQ_MODE_I | tag |
592 				(TXQ_CMD_SSP << TXQ_CMD_SHIFT) |
593 				(phy_mask << TXQ_PHY_SHIFT));
594 
595 	flags = MCH_RETRY;
596 	if (task->ssp_task.enable_first_burst) {
597 		flags |= MCH_FBURST;
598 		fburst = (1 << 7);
599 	}
600 	if (is_tmf)
601 		flags |= (MCH_SSP_FR_TASK << MCH_SSP_FR_TYPE_SHIFT);
602 	else
603 		flags |= (MCH_SSP_FR_CMD << MCH_SSP_FR_TYPE_SHIFT);
604 
605 	hdr->flags = cpu_to_le32(flags | (tei->n_elem << MCH_PRD_LEN_SHIFT));
606 	hdr->tags = cpu_to_le32(tag);
607 	hdr->data_len = cpu_to_le32(task->total_xfer_len);
608 
609 	/*
610 	 * arrange MVS_SLOT_BUF_SZ-sized DMA buffer according to our needs
611 	 */
612 
613 	/* region 1: command table area (MVS_SSP_CMD_SZ bytes) ************** */
614 	buf_cmd = buf_tmp = slot->buf;
615 	buf_tmp_dma = slot->buf_dma;
616 
617 	hdr->cmd_tbl = cpu_to_le64(buf_tmp_dma);
618 
619 	buf_tmp += MVS_SSP_CMD_SZ;
620 	buf_tmp_dma += MVS_SSP_CMD_SZ;
621 
622 	/* region 2: open address frame area (MVS_OAF_SZ bytes) ********* */
623 	buf_oaf = buf_tmp;
624 	hdr->open_frame = cpu_to_le64(buf_tmp_dma);
625 
626 	buf_tmp += MVS_OAF_SZ;
627 	buf_tmp_dma += MVS_OAF_SZ;
628 
629 	/* region 3: PRD table ********************************************* */
630 	buf_prd = buf_tmp;
631 	if (tei->n_elem)
632 		hdr->prd_tbl = cpu_to_le64(buf_tmp_dma);
633 	else
634 		hdr->prd_tbl = 0;
635 
636 	i = MVS_CHIP_DISP->prd_size() * tei->n_elem;
637 	buf_tmp += i;
638 	buf_tmp_dma += i;
639 
640 	/* region 4: status buffer (larger the PRD, smaller this buf) ****** */
641 	slot->response = buf_tmp;
642 	hdr->status_buf = cpu_to_le64(buf_tmp_dma);
643 	if (mvi->flags & MVF_FLAG_SOC)
644 		hdr->reserved[0] = 0;
645 
646 	resp_len = MVS_SLOT_BUF_SZ - MVS_SSP_CMD_SZ - MVS_OAF_SZ -
647 	    sizeof(struct mvs_err_info) - i;
648 	resp_len = min(resp_len, max_resp_len);
649 
650 	req_len = sizeof(struct ssp_frame_hdr) + 28;
651 
652 	/* request, response lengths */
653 	hdr->lens = cpu_to_le32(((resp_len / 4) << 16) | (req_len / 4));
654 
655 	/* generate open address frame hdr (first 12 bytes) */
656 	/* initiator, SSP, ftype 1h */
657 	buf_oaf[0] = (1 << 7) | (PROTOCOL_SSP << 4) | 0x1;
658 	buf_oaf[1] = min(sas_port->linkrate, dev->linkrate) & 0xf;
659 	*(u16 *)(buf_oaf + 2) = cpu_to_be16(mvi_dev->device_id + 1);
660 	memcpy(buf_oaf + 4, dev->sas_addr, SAS_ADDR_SIZE);
661 
662 	/* fill in SSP frame header (Command Table.SSP frame header) */
663 	ssp_hdr = (struct ssp_frame_hdr *)buf_cmd;
664 
665 	if (is_tmf)
666 		ssp_hdr->frame_type = SSP_TASK;
667 	else
668 		ssp_hdr->frame_type = SSP_COMMAND;
669 
670 	memcpy(ssp_hdr->hashed_dest_addr, dev->hashed_sas_addr,
671 	       HASHED_SAS_ADDR_SIZE);
672 	memcpy(ssp_hdr->hashed_src_addr,
673 	       dev->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
674 	ssp_hdr->tag = cpu_to_be16(tag);
675 
676 	/* fill in IU for TASK and Command Frame */
677 	buf_cmd += sizeof(*ssp_hdr);
678 	memcpy(buf_cmd, &task->ssp_task.LUN, 8);
679 
680 	if (ssp_hdr->frame_type != SSP_TASK) {
681 		buf_cmd[9] = fburst | task->ssp_task.task_attr |
682 				(task->ssp_task.task_prio << 3);
683 		memcpy(buf_cmd + 12, &task->ssp_task.cdb, 16);
684 	} else{
685 		buf_cmd[10] = tmf->tmf;
686 		switch (tmf->tmf) {
687 		case TMF_ABORT_TASK:
688 		case TMF_QUERY_TASK:
689 			buf_cmd[12] =
690 				(tmf->tag_of_task_to_be_managed >> 8) & 0xff;
691 			buf_cmd[13] =
692 				tmf->tag_of_task_to_be_managed & 0xff;
693 			break;
694 		default:
695 			break;
696 		}
697 	}
698 	/* fill in PRD (scatter/gather) table, if any */
699 	MVS_CHIP_DISP->make_prd(task->scatter, tei->n_elem, buf_prd);
700 	return 0;
701 }
702 
703 #define	DEV_IS_GONE(mvi_dev)	((!mvi_dev || (mvi_dev->dev_type == NO_DEVICE)))
mvs_task_prep(struct sas_task * task,struct mvs_info * mvi,int is_tmf,struct mvs_tmf_task * tmf,int * pass)704 static int mvs_task_prep(struct sas_task *task, struct mvs_info *mvi, int is_tmf,
705 				struct mvs_tmf_task *tmf, int *pass)
706 {
707 	struct domain_device *dev = task->dev;
708 	struct mvs_device *mvi_dev = dev->lldd_dev;
709 	struct mvs_task_exec_info tei;
710 	struct mvs_slot_info *slot;
711 	u32 tag = 0xdeadbeef, n_elem = 0;
712 	int rc = 0;
713 
714 	if (!dev->port) {
715 		struct task_status_struct *tsm = &task->task_status;
716 
717 		tsm->resp = SAS_TASK_UNDELIVERED;
718 		tsm->stat = SAS_PHY_DOWN;
719 		/*
720 		 * libsas will use dev->port, should
721 		 * not call task_done for sata
722 		 */
723 		if (dev->dev_type != SATA_DEV)
724 			task->task_done(task);
725 		return rc;
726 	}
727 
728 	if (DEV_IS_GONE(mvi_dev)) {
729 		if (mvi_dev)
730 			mv_dprintk("device %d not ready.\n",
731 				mvi_dev->device_id);
732 		else
733 			mv_dprintk("device %016llx not ready.\n",
734 				SAS_ADDR(dev->sas_addr));
735 
736 			rc = SAS_PHY_DOWN;
737 			return rc;
738 	}
739 	tei.port = dev->port->lldd_port;
740 	if (tei.port && !tei.port->port_attached && !tmf) {
741 		if (sas_protocol_ata(task->task_proto)) {
742 			struct task_status_struct *ts = &task->task_status;
743 			mv_dprintk("SATA/STP port %d does not attach"
744 					"device.\n", dev->port->id);
745 			ts->resp = SAS_TASK_COMPLETE;
746 			ts->stat = SAS_PHY_DOWN;
747 
748 			task->task_done(task);
749 
750 		} else {
751 			struct task_status_struct *ts = &task->task_status;
752 			mv_dprintk("SAS port %d does not attach"
753 				"device.\n", dev->port->id);
754 			ts->resp = SAS_TASK_UNDELIVERED;
755 			ts->stat = SAS_PHY_DOWN;
756 			task->task_done(task);
757 		}
758 		return rc;
759 	}
760 
761 	if (!sas_protocol_ata(task->task_proto)) {
762 		if (task->num_scatter) {
763 			n_elem = dma_map_sg(mvi->dev,
764 					    task->scatter,
765 					    task->num_scatter,
766 					    task->data_dir);
767 			if (!n_elem) {
768 				rc = -ENOMEM;
769 				goto prep_out;
770 			}
771 		}
772 	} else {
773 		n_elem = task->num_scatter;
774 	}
775 
776 	rc = mvs_tag_alloc(mvi, &tag);
777 	if (rc)
778 		goto err_out;
779 
780 	slot = &mvi->slot_info[tag];
781 
782 	task->lldd_task = NULL;
783 	slot->n_elem = n_elem;
784 	slot->slot_tag = tag;
785 
786 	slot->buf = pci_pool_alloc(mvi->dma_pool, GFP_ATOMIC, &slot->buf_dma);
787 	if (!slot->buf)
788 		goto err_out_tag;
789 	memset(slot->buf, 0, MVS_SLOT_BUF_SZ);
790 
791 	tei.task = task;
792 	tei.hdr = &mvi->slot[tag];
793 	tei.tag = tag;
794 	tei.n_elem = n_elem;
795 	switch (task->task_proto) {
796 	case SAS_PROTOCOL_SMP:
797 		rc = mvs_task_prep_smp(mvi, &tei);
798 		break;
799 	case SAS_PROTOCOL_SSP:
800 		rc = mvs_task_prep_ssp(mvi, &tei, is_tmf, tmf);
801 		break;
802 	case SAS_PROTOCOL_SATA:
803 	case SAS_PROTOCOL_STP:
804 	case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP:
805 		rc = mvs_task_prep_ata(mvi, &tei);
806 		break;
807 	default:
808 		dev_printk(KERN_ERR, mvi->dev,
809 			"unknown sas_task proto: 0x%x\n",
810 			task->task_proto);
811 		rc = -EINVAL;
812 		break;
813 	}
814 
815 	if (rc) {
816 		mv_dprintk("rc is %x\n", rc);
817 		goto err_out_slot_buf;
818 	}
819 	slot->task = task;
820 	slot->port = tei.port;
821 	task->lldd_task = slot;
822 	list_add_tail(&slot->entry, &tei.port->list);
823 	spin_lock(&task->task_state_lock);
824 	task->task_state_flags |= SAS_TASK_AT_INITIATOR;
825 	spin_unlock(&task->task_state_lock);
826 
827 	mvi_dev->running_req++;
828 	++(*pass);
829 	mvi->tx_prod = (mvi->tx_prod + 1) & (MVS_CHIP_SLOT_SZ - 1);
830 
831 	return rc;
832 
833 err_out_slot_buf:
834 	pci_pool_free(mvi->dma_pool, slot->buf, slot->buf_dma);
835 err_out_tag:
836 	mvs_tag_free(mvi, tag);
837 err_out:
838 
839 	dev_printk(KERN_ERR, mvi->dev, "mvsas prep failed[%d]!\n", rc);
840 	if (!sas_protocol_ata(task->task_proto))
841 		if (n_elem)
842 			dma_unmap_sg(mvi->dev, task->scatter, n_elem,
843 				     task->data_dir);
844 prep_out:
845 	return rc;
846 }
847 
mvs_task_alloc_list(int * num,gfp_t gfp_flags)848 static struct mvs_task_list *mvs_task_alloc_list(int *num, gfp_t gfp_flags)
849 {
850 	struct mvs_task_list *first = NULL;
851 
852 	for (; *num > 0; --*num) {
853 		struct mvs_task_list *mvs_list = kmem_cache_zalloc(mvs_task_list_cache, gfp_flags);
854 
855 		if (!mvs_list)
856 			break;
857 
858 		INIT_LIST_HEAD(&mvs_list->list);
859 		if (!first)
860 			first = mvs_list;
861 		else
862 			list_add_tail(&mvs_list->list, &first->list);
863 
864 	}
865 
866 	return first;
867 }
868 
mvs_task_free_list(struct mvs_task_list * mvs_list)869 static inline void mvs_task_free_list(struct mvs_task_list *mvs_list)
870 {
871 	LIST_HEAD(list);
872 	struct list_head *pos, *a;
873 	struct mvs_task_list *mlist = NULL;
874 
875 	__list_add(&list, mvs_list->list.prev, &mvs_list->list);
876 
877 	list_for_each_safe(pos, a, &list) {
878 		list_del_init(pos);
879 		mlist = list_entry(pos, struct mvs_task_list, list);
880 		kmem_cache_free(mvs_task_list_cache, mlist);
881 	}
882 }
883 
mvs_task_exec(struct sas_task * task,const int num,gfp_t gfp_flags,struct completion * completion,int is_tmf,struct mvs_tmf_task * tmf)884 static int mvs_task_exec(struct sas_task *task, const int num, gfp_t gfp_flags,
885 				struct completion *completion, int is_tmf,
886 				struct mvs_tmf_task *tmf)
887 {
888 	struct mvs_info *mvi = NULL;
889 	u32 rc = 0;
890 	u32 pass = 0;
891 	unsigned long flags = 0;
892 
893 	mvi = ((struct mvs_device *)task->dev->lldd_dev)->mvi_info;
894 
895 	spin_lock_irqsave(&mvi->lock, flags);
896 	rc = mvs_task_prep(task, mvi, is_tmf, tmf, &pass);
897 	if (rc)
898 		dev_printk(KERN_ERR, mvi->dev, "mvsas exec failed[%d]!\n", rc);
899 
900 	if (likely(pass))
901 			MVS_CHIP_DISP->start_delivery(mvi, (mvi->tx_prod - 1) &
902 				(MVS_CHIP_SLOT_SZ - 1));
903 	spin_unlock_irqrestore(&mvi->lock, flags);
904 
905 	return rc;
906 }
907 
mvs_collector_task_exec(struct sas_task * task,const int num,gfp_t gfp_flags,struct completion * completion,int is_tmf,struct mvs_tmf_task * tmf)908 static int mvs_collector_task_exec(struct sas_task *task, const int num, gfp_t gfp_flags,
909 				struct completion *completion, int is_tmf,
910 				struct mvs_tmf_task *tmf)
911 {
912 	struct domain_device *dev = task->dev;
913 	struct mvs_prv_info *mpi = dev->port->ha->lldd_ha;
914 	struct mvs_info *mvi = NULL;
915 	struct sas_task *t = task;
916 	struct mvs_task_list *mvs_list = NULL, *a;
917 	LIST_HEAD(q);
918 	int pass[2] = {0};
919 	u32 rc = 0;
920 	u32 n = num;
921 	unsigned long flags = 0;
922 
923 	mvs_list = mvs_task_alloc_list(&n, gfp_flags);
924 	if (n) {
925 		printk(KERN_ERR "%s: mvs alloc list failed.\n", __func__);
926 		rc = -ENOMEM;
927 		goto free_list;
928 	}
929 
930 	__list_add(&q, mvs_list->list.prev, &mvs_list->list);
931 
932 	list_for_each_entry(a, &q, list) {
933 		a->task = t;
934 		t = list_entry(t->list.next, struct sas_task, list);
935 	}
936 
937 	list_for_each_entry(a, &q , list) {
938 
939 		t = a->task;
940 		mvi = ((struct mvs_device *)t->dev->lldd_dev)->mvi_info;
941 
942 		spin_lock_irqsave(&mvi->lock, flags);
943 		rc = mvs_task_prep(t, mvi, is_tmf, tmf, &pass[mvi->id]);
944 		if (rc)
945 			dev_printk(KERN_ERR, mvi->dev, "mvsas exec failed[%d]!\n", rc);
946 		spin_unlock_irqrestore(&mvi->lock, flags);
947 	}
948 
949 	if (likely(pass[0]))
950 			MVS_CHIP_DISP->start_delivery(mpi->mvi[0],
951 				(mpi->mvi[0]->tx_prod - 1) & (MVS_CHIP_SLOT_SZ - 1));
952 
953 	if (likely(pass[1]))
954 			MVS_CHIP_DISP->start_delivery(mpi->mvi[1],
955 				(mpi->mvi[1]->tx_prod - 1) & (MVS_CHIP_SLOT_SZ - 1));
956 
957 	list_del_init(&q);
958 
959 free_list:
960 	if (mvs_list)
961 		mvs_task_free_list(mvs_list);
962 
963 	return rc;
964 }
965 
mvs_queue_command(struct sas_task * task,const int num,gfp_t gfp_flags)966 int mvs_queue_command(struct sas_task *task, const int num,
967 			gfp_t gfp_flags)
968 {
969 	struct mvs_device *mvi_dev = task->dev->lldd_dev;
970 	struct sas_ha_struct *sas = mvi_dev->mvi_info->sas;
971 
972 	if (sas->lldd_max_execute_num < 2)
973 		return mvs_task_exec(task, num, gfp_flags, NULL, 0, NULL);
974 	else
975 		return mvs_collector_task_exec(task, num, gfp_flags, NULL, 0, NULL);
976 }
977 
mvs_slot_free(struct mvs_info * mvi,u32 rx_desc)978 static void mvs_slot_free(struct mvs_info *mvi, u32 rx_desc)
979 {
980 	u32 slot_idx = rx_desc & RXQ_SLOT_MASK;
981 	mvs_tag_clear(mvi, slot_idx);
982 }
983 
mvs_slot_task_free(struct mvs_info * mvi,struct sas_task * task,struct mvs_slot_info * slot,u32 slot_idx)984 static void mvs_slot_task_free(struct mvs_info *mvi, struct sas_task *task,
985 			  struct mvs_slot_info *slot, u32 slot_idx)
986 {
987 	if (!slot->task)
988 		return;
989 	if (!sas_protocol_ata(task->task_proto))
990 		if (slot->n_elem)
991 			dma_unmap_sg(mvi->dev, task->scatter,
992 				     slot->n_elem, task->data_dir);
993 
994 	switch (task->task_proto) {
995 	case SAS_PROTOCOL_SMP:
996 		dma_unmap_sg(mvi->dev, &task->smp_task.smp_resp, 1,
997 			     PCI_DMA_FROMDEVICE);
998 		dma_unmap_sg(mvi->dev, &task->smp_task.smp_req, 1,
999 			     PCI_DMA_TODEVICE);
1000 		break;
1001 
1002 	case SAS_PROTOCOL_SATA:
1003 	case SAS_PROTOCOL_STP:
1004 	case SAS_PROTOCOL_SSP:
1005 	default:
1006 		/* do nothing */
1007 		break;
1008 	}
1009 
1010 	if (slot->buf) {
1011 		pci_pool_free(mvi->dma_pool, slot->buf, slot->buf_dma);
1012 		slot->buf = NULL;
1013 	}
1014 	list_del_init(&slot->entry);
1015 	task->lldd_task = NULL;
1016 	slot->task = NULL;
1017 	slot->port = NULL;
1018 	slot->slot_tag = 0xFFFFFFFF;
1019 	mvs_slot_free(mvi, slot_idx);
1020 }
1021 
mvs_update_wideport(struct mvs_info * mvi,int phy_no)1022 static void mvs_update_wideport(struct mvs_info *mvi, int phy_no)
1023 {
1024 	struct mvs_phy *phy = &mvi->phy[phy_no];
1025 	struct mvs_port *port = phy->port;
1026 	int j, no;
1027 
1028 	for_each_phy(port->wide_port_phymap, j, no) {
1029 		if (j & 1) {
1030 			MVS_CHIP_DISP->write_port_cfg_addr(mvi, no,
1031 						PHYR_WIDE_PORT);
1032 			MVS_CHIP_DISP->write_port_cfg_data(mvi, no,
1033 						port->wide_port_phymap);
1034 		} else {
1035 			MVS_CHIP_DISP->write_port_cfg_addr(mvi, no,
1036 						PHYR_WIDE_PORT);
1037 			MVS_CHIP_DISP->write_port_cfg_data(mvi, no,
1038 						0);
1039 		}
1040 	}
1041 }
1042 
mvs_is_phy_ready(struct mvs_info * mvi,int i)1043 static u32 mvs_is_phy_ready(struct mvs_info *mvi, int i)
1044 {
1045 	u32 tmp;
1046 	struct mvs_phy *phy = &mvi->phy[i];
1047 	struct mvs_port *port = phy->port;
1048 
1049 	tmp = MVS_CHIP_DISP->read_phy_ctl(mvi, i);
1050 	if ((tmp & PHY_READY_MASK) && !(phy->irq_status & PHYEV_POOF)) {
1051 		if (!port)
1052 			phy->phy_attached = 1;
1053 		return tmp;
1054 	}
1055 
1056 	if (port) {
1057 		if (phy->phy_type & PORT_TYPE_SAS) {
1058 			port->wide_port_phymap &= ~(1U << i);
1059 			if (!port->wide_port_phymap)
1060 				port->port_attached = 0;
1061 			mvs_update_wideport(mvi, i);
1062 		} else if (phy->phy_type & PORT_TYPE_SATA)
1063 			port->port_attached = 0;
1064 		phy->port = NULL;
1065 		phy->phy_attached = 0;
1066 		phy->phy_type &= ~(PORT_TYPE_SAS | PORT_TYPE_SATA);
1067 	}
1068 	return 0;
1069 }
1070 
mvs_get_d2h_reg(struct mvs_info * mvi,int i,void * buf)1071 static void *mvs_get_d2h_reg(struct mvs_info *mvi, int i, void *buf)
1072 {
1073 	u32 *s = (u32 *) buf;
1074 
1075 	if (!s)
1076 		return NULL;
1077 
1078 	MVS_CHIP_DISP->write_port_cfg_addr(mvi, i, PHYR_SATA_SIG3);
1079 	s[3] = cpu_to_le32(MVS_CHIP_DISP->read_port_cfg_data(mvi, i));
1080 
1081 	MVS_CHIP_DISP->write_port_cfg_addr(mvi, i, PHYR_SATA_SIG2);
1082 	s[2] = cpu_to_le32(MVS_CHIP_DISP->read_port_cfg_data(mvi, i));
1083 
1084 	MVS_CHIP_DISP->write_port_cfg_addr(mvi, i, PHYR_SATA_SIG1);
1085 	s[1] = cpu_to_le32(MVS_CHIP_DISP->read_port_cfg_data(mvi, i));
1086 
1087 	MVS_CHIP_DISP->write_port_cfg_addr(mvi, i, PHYR_SATA_SIG0);
1088 	s[0] = cpu_to_le32(MVS_CHIP_DISP->read_port_cfg_data(mvi, i));
1089 
1090 	if (((s[1] & 0x00FFFFFF) == 0x00EB1401) && (*(u8 *)&s[3] == 0x01))
1091 		s[1] = 0x00EB1401 | (*((u8 *)&s[1] + 3) & 0x10);
1092 
1093 	return s;
1094 }
1095 
mvs_is_sig_fis_received(u32 irq_status)1096 static u32 mvs_is_sig_fis_received(u32 irq_status)
1097 {
1098 	return irq_status & PHYEV_SIG_FIS;
1099 }
1100 
mvs_sig_remove_timer(struct mvs_phy * phy)1101 static void mvs_sig_remove_timer(struct mvs_phy *phy)
1102 {
1103 	if (phy->timer.function)
1104 		del_timer(&phy->timer);
1105 	phy->timer.function = NULL;
1106 }
1107 
mvs_update_phyinfo(struct mvs_info * mvi,int i,int get_st)1108 void mvs_update_phyinfo(struct mvs_info *mvi, int i, int get_st)
1109 {
1110 	struct mvs_phy *phy = &mvi->phy[i];
1111 	struct sas_identify_frame *id;
1112 
1113 	id = (struct sas_identify_frame *)phy->frame_rcvd;
1114 
1115 	if (get_st) {
1116 		phy->irq_status = MVS_CHIP_DISP->read_port_irq_stat(mvi, i);
1117 		phy->phy_status = mvs_is_phy_ready(mvi, i);
1118 	}
1119 
1120 	if (phy->phy_status) {
1121 		int oob_done = 0;
1122 		struct asd_sas_phy *sas_phy = &mvi->phy[i].sas_phy;
1123 
1124 		oob_done = MVS_CHIP_DISP->oob_done(mvi, i);
1125 
1126 		MVS_CHIP_DISP->fix_phy_info(mvi, i, id);
1127 		if (phy->phy_type & PORT_TYPE_SATA) {
1128 			phy->identify.target_port_protocols = SAS_PROTOCOL_STP;
1129 			if (mvs_is_sig_fis_received(phy->irq_status)) {
1130 				mvs_sig_remove_timer(phy);
1131 				phy->phy_attached = 1;
1132 				phy->att_dev_sas_addr =
1133 					i + mvi->id * mvi->chip->n_phy;
1134 				if (oob_done)
1135 					sas_phy->oob_mode = SATA_OOB_MODE;
1136 				phy->frame_rcvd_size =
1137 				    sizeof(struct dev_to_host_fis);
1138 				mvs_get_d2h_reg(mvi, i, id);
1139 			} else {
1140 				u32 tmp;
1141 				dev_printk(KERN_DEBUG, mvi->dev,
1142 					"Phy%d : No sig fis\n", i);
1143 				tmp = MVS_CHIP_DISP->read_port_irq_mask(mvi, i);
1144 				MVS_CHIP_DISP->write_port_irq_mask(mvi, i,
1145 						tmp | PHYEV_SIG_FIS);
1146 				phy->phy_attached = 0;
1147 				phy->phy_type &= ~PORT_TYPE_SATA;
1148 				goto out_done;
1149 			}
1150 		}	else if (phy->phy_type & PORT_TYPE_SAS
1151 			|| phy->att_dev_info & PORT_SSP_INIT_MASK) {
1152 			phy->phy_attached = 1;
1153 			phy->identify.device_type =
1154 				phy->att_dev_info & PORT_DEV_TYPE_MASK;
1155 
1156 			if (phy->identify.device_type == SAS_END_DEV)
1157 				phy->identify.target_port_protocols =
1158 							SAS_PROTOCOL_SSP;
1159 			else if (phy->identify.device_type != NO_DEVICE)
1160 				phy->identify.target_port_protocols =
1161 							SAS_PROTOCOL_SMP;
1162 			if (oob_done)
1163 				sas_phy->oob_mode = SAS_OOB_MODE;
1164 			phy->frame_rcvd_size =
1165 			    sizeof(struct sas_identify_frame);
1166 		}
1167 		memcpy(sas_phy->attached_sas_addr,
1168 			&phy->att_dev_sas_addr, SAS_ADDR_SIZE);
1169 
1170 		if (MVS_CHIP_DISP->phy_work_around)
1171 			MVS_CHIP_DISP->phy_work_around(mvi, i);
1172 	}
1173 	mv_dprintk("phy %d attach dev info is %x\n",
1174 		i + mvi->id * mvi->chip->n_phy, phy->att_dev_info);
1175 	mv_dprintk("phy %d attach sas addr is %llx\n",
1176 		i + mvi->id * mvi->chip->n_phy, phy->att_dev_sas_addr);
1177 out_done:
1178 	if (get_st)
1179 		MVS_CHIP_DISP->write_port_irq_stat(mvi, i, phy->irq_status);
1180 }
1181 
mvs_port_notify_formed(struct asd_sas_phy * sas_phy,int lock)1182 static void mvs_port_notify_formed(struct asd_sas_phy *sas_phy, int lock)
1183 {
1184 	struct sas_ha_struct *sas_ha = sas_phy->ha;
1185 	struct mvs_info *mvi = NULL; int i = 0, hi;
1186 	struct mvs_phy *phy = sas_phy->lldd_phy;
1187 	struct asd_sas_port *sas_port = sas_phy->port;
1188 	struct mvs_port *port;
1189 	unsigned long flags = 0;
1190 	if (!sas_port)
1191 		return;
1192 
1193 	while (sas_ha->sas_phy[i]) {
1194 		if (sas_ha->sas_phy[i] == sas_phy)
1195 			break;
1196 		i++;
1197 	}
1198 	hi = i/((struct mvs_prv_info *)sas_ha->lldd_ha)->n_phy;
1199 	mvi = ((struct mvs_prv_info *)sas_ha->lldd_ha)->mvi[hi];
1200 	if (i >= mvi->chip->n_phy)
1201 		port = &mvi->port[i - mvi->chip->n_phy];
1202 	else
1203 		port = &mvi->port[i];
1204 	if (lock)
1205 		spin_lock_irqsave(&mvi->lock, flags);
1206 	port->port_attached = 1;
1207 	phy->port = port;
1208 	sas_port->lldd_port = port;
1209 	if (phy->phy_type & PORT_TYPE_SAS) {
1210 		port->wide_port_phymap = sas_port->phy_mask;
1211 		mv_printk("set wide port phy map %x\n", sas_port->phy_mask);
1212 		mvs_update_wideport(mvi, sas_phy->id);
1213 
1214 		/* direct attached SAS device */
1215 		if (phy->att_dev_info & PORT_SSP_TRGT_MASK) {
1216 			MVS_CHIP_DISP->write_port_cfg_addr(mvi, i, PHYR_PHY_STAT);
1217 			MVS_CHIP_DISP->write_port_cfg_data(mvi, i, 0x04);
1218 		}
1219 	}
1220 	if (lock)
1221 		spin_unlock_irqrestore(&mvi->lock, flags);
1222 }
1223 
mvs_port_notify_deformed(struct asd_sas_phy * sas_phy,int lock)1224 static void mvs_port_notify_deformed(struct asd_sas_phy *sas_phy, int lock)
1225 {
1226 	struct domain_device *dev;
1227 	struct mvs_phy *phy = sas_phy->lldd_phy;
1228 	struct mvs_info *mvi = phy->mvi;
1229 	struct asd_sas_port *port = sas_phy->port;
1230 	int phy_no = 0;
1231 
1232 	while (phy != &mvi->phy[phy_no]) {
1233 		phy_no++;
1234 		if (phy_no >= MVS_MAX_PHYS)
1235 			return;
1236 	}
1237 	list_for_each_entry(dev, &port->dev_list, dev_list_node)
1238 		mvs_do_release_task(phy->mvi, phy_no, dev);
1239 
1240 }
1241 
1242 
mvs_port_formed(struct asd_sas_phy * sas_phy)1243 void mvs_port_formed(struct asd_sas_phy *sas_phy)
1244 {
1245 	mvs_port_notify_formed(sas_phy, 1);
1246 }
1247 
mvs_port_deformed(struct asd_sas_phy * sas_phy)1248 void mvs_port_deformed(struct asd_sas_phy *sas_phy)
1249 {
1250 	mvs_port_notify_deformed(sas_phy, 1);
1251 }
1252 
mvs_alloc_dev(struct mvs_info * mvi)1253 struct mvs_device *mvs_alloc_dev(struct mvs_info *mvi)
1254 {
1255 	u32 dev;
1256 	for (dev = 0; dev < MVS_MAX_DEVICES; dev++) {
1257 		if (mvi->devices[dev].dev_type == NO_DEVICE) {
1258 			mvi->devices[dev].device_id = dev;
1259 			return &mvi->devices[dev];
1260 		}
1261 	}
1262 
1263 	if (dev == MVS_MAX_DEVICES)
1264 		mv_printk("max support %d devices, ignore ..\n",
1265 			MVS_MAX_DEVICES);
1266 
1267 	return NULL;
1268 }
1269 
mvs_free_dev(struct mvs_device * mvi_dev)1270 void mvs_free_dev(struct mvs_device *mvi_dev)
1271 {
1272 	u32 id = mvi_dev->device_id;
1273 	memset(mvi_dev, 0, sizeof(*mvi_dev));
1274 	mvi_dev->device_id = id;
1275 	mvi_dev->dev_type = NO_DEVICE;
1276 	mvi_dev->dev_status = MVS_DEV_NORMAL;
1277 	mvi_dev->taskfileset = MVS_ID_NOT_MAPPED;
1278 }
1279 
mvs_dev_found_notify(struct domain_device * dev,int lock)1280 int mvs_dev_found_notify(struct domain_device *dev, int lock)
1281 {
1282 	unsigned long flags = 0;
1283 	int res = 0;
1284 	struct mvs_info *mvi = NULL;
1285 	struct domain_device *parent_dev = dev->parent;
1286 	struct mvs_device *mvi_device;
1287 
1288 	mvi = mvs_find_dev_mvi(dev);
1289 
1290 	if (lock)
1291 		spin_lock_irqsave(&mvi->lock, flags);
1292 
1293 	mvi_device = mvs_alloc_dev(mvi);
1294 	if (!mvi_device) {
1295 		res = -1;
1296 		goto found_out;
1297 	}
1298 	dev->lldd_dev = mvi_device;
1299 	mvi_device->dev_status = MVS_DEV_NORMAL;
1300 	mvi_device->dev_type = dev->dev_type;
1301 	mvi_device->mvi_info = mvi;
1302 	mvi_device->sas_device = dev;
1303 	if (parent_dev && DEV_IS_EXPANDER(parent_dev->dev_type)) {
1304 		int phy_id;
1305 		u8 phy_num = parent_dev->ex_dev.num_phys;
1306 		struct ex_phy *phy;
1307 		for (phy_id = 0; phy_id < phy_num; phy_id++) {
1308 			phy = &parent_dev->ex_dev.ex_phy[phy_id];
1309 			if (SAS_ADDR(phy->attached_sas_addr) ==
1310 				SAS_ADDR(dev->sas_addr)) {
1311 				mvi_device->attached_phy = phy_id;
1312 				break;
1313 			}
1314 		}
1315 
1316 		if (phy_id == phy_num) {
1317 			mv_printk("Error: no attached dev:%016llx"
1318 				"at ex:%016llx.\n",
1319 				SAS_ADDR(dev->sas_addr),
1320 				SAS_ADDR(parent_dev->sas_addr));
1321 			res = -1;
1322 		}
1323 	}
1324 
1325 found_out:
1326 	if (lock)
1327 		spin_unlock_irqrestore(&mvi->lock, flags);
1328 	return res;
1329 }
1330 
mvs_dev_found(struct domain_device * dev)1331 int mvs_dev_found(struct domain_device *dev)
1332 {
1333 	return mvs_dev_found_notify(dev, 1);
1334 }
1335 
mvs_dev_gone_notify(struct domain_device * dev)1336 void mvs_dev_gone_notify(struct domain_device *dev)
1337 {
1338 	unsigned long flags = 0;
1339 	struct mvs_device *mvi_dev = dev->lldd_dev;
1340 	struct mvs_info *mvi = mvi_dev->mvi_info;
1341 
1342 	spin_lock_irqsave(&mvi->lock, flags);
1343 
1344 	if (mvi_dev) {
1345 		mv_dprintk("found dev[%d:%x] is gone.\n",
1346 			mvi_dev->device_id, mvi_dev->dev_type);
1347 		mvs_release_task(mvi, dev);
1348 		mvs_free_reg_set(mvi, mvi_dev);
1349 		mvs_free_dev(mvi_dev);
1350 	} else {
1351 		mv_dprintk("found dev has gone.\n");
1352 	}
1353 	dev->lldd_dev = NULL;
1354 	mvi_dev->sas_device = NULL;
1355 
1356 	spin_unlock_irqrestore(&mvi->lock, flags);
1357 }
1358 
1359 
mvs_dev_gone(struct domain_device * dev)1360 void mvs_dev_gone(struct domain_device *dev)
1361 {
1362 	mvs_dev_gone_notify(dev);
1363 }
1364 
mvs_task_done(struct sas_task * task)1365 static void mvs_task_done(struct sas_task *task)
1366 {
1367 	if (!del_timer(&task->timer))
1368 		return;
1369 	complete(&task->completion);
1370 }
1371 
mvs_tmf_timedout(unsigned long data)1372 static void mvs_tmf_timedout(unsigned long data)
1373 {
1374 	struct sas_task *task = (struct sas_task *)data;
1375 
1376 	task->task_state_flags |= SAS_TASK_STATE_ABORTED;
1377 	complete(&task->completion);
1378 }
1379 
1380 #define MVS_TASK_TIMEOUT 20
mvs_exec_internal_tmf_task(struct domain_device * dev,void * parameter,u32 para_len,struct mvs_tmf_task * tmf)1381 static int mvs_exec_internal_tmf_task(struct domain_device *dev,
1382 			void *parameter, u32 para_len, struct mvs_tmf_task *tmf)
1383 {
1384 	int res, retry;
1385 	struct sas_task *task = NULL;
1386 
1387 	for (retry = 0; retry < 3; retry++) {
1388 		task = sas_alloc_task(GFP_KERNEL);
1389 		if (!task)
1390 			return -ENOMEM;
1391 
1392 		task->dev = dev;
1393 		task->task_proto = dev->tproto;
1394 
1395 		memcpy(&task->ssp_task, parameter, para_len);
1396 		task->task_done = mvs_task_done;
1397 
1398 		task->timer.data = (unsigned long) task;
1399 		task->timer.function = mvs_tmf_timedout;
1400 		task->timer.expires = jiffies + MVS_TASK_TIMEOUT*HZ;
1401 		add_timer(&task->timer);
1402 
1403 		res = mvs_task_exec(task, 1, GFP_KERNEL, NULL, 1, tmf);
1404 
1405 		if (res) {
1406 			del_timer(&task->timer);
1407 			mv_printk("executing internel task failed:%d\n", res);
1408 			goto ex_err;
1409 		}
1410 
1411 		wait_for_completion(&task->completion);
1412 		res = TMF_RESP_FUNC_FAILED;
1413 		/* Even TMF timed out, return direct. */
1414 		if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
1415 			if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
1416 				mv_printk("TMF task[%x] timeout.\n", tmf->tmf);
1417 				goto ex_err;
1418 			}
1419 		}
1420 
1421 		if (task->task_status.resp == SAS_TASK_COMPLETE &&
1422 		    task->task_status.stat == SAM_STAT_GOOD) {
1423 			res = TMF_RESP_FUNC_COMPLETE;
1424 			break;
1425 		}
1426 
1427 		if (task->task_status.resp == SAS_TASK_COMPLETE &&
1428 		      task->task_status.stat == SAS_DATA_UNDERRUN) {
1429 			/* no error, but return the number of bytes of
1430 			 * underrun */
1431 			res = task->task_status.residual;
1432 			break;
1433 		}
1434 
1435 		if (task->task_status.resp == SAS_TASK_COMPLETE &&
1436 		      task->task_status.stat == SAS_DATA_OVERRUN) {
1437 			mv_dprintk("blocked task error.\n");
1438 			res = -EMSGSIZE;
1439 			break;
1440 		} else {
1441 			mv_dprintk(" task to dev %016llx response: 0x%x "
1442 				    "status 0x%x\n",
1443 				    SAS_ADDR(dev->sas_addr),
1444 				    task->task_status.resp,
1445 				    task->task_status.stat);
1446 			sas_free_task(task);
1447 			task = NULL;
1448 
1449 		}
1450 	}
1451 ex_err:
1452 	BUG_ON(retry == 3 && task != NULL);
1453 	sas_free_task(task);
1454 	return res;
1455 }
1456 
mvs_debug_issue_ssp_tmf(struct domain_device * dev,u8 * lun,struct mvs_tmf_task * tmf)1457 static int mvs_debug_issue_ssp_tmf(struct domain_device *dev,
1458 				u8 *lun, struct mvs_tmf_task *tmf)
1459 {
1460 	struct sas_ssp_task ssp_task;
1461 	if (!(dev->tproto & SAS_PROTOCOL_SSP))
1462 		return TMF_RESP_FUNC_ESUPP;
1463 
1464 	memcpy(ssp_task.LUN, lun, 8);
1465 
1466 	return mvs_exec_internal_tmf_task(dev, &ssp_task,
1467 				sizeof(ssp_task), tmf);
1468 }
1469 
1470 
1471 /*  Standard mandates link reset for ATA  (type 0)
1472     and hard reset for SSP (type 1) , only for RECOVERY */
mvs_debug_I_T_nexus_reset(struct domain_device * dev)1473 static int mvs_debug_I_T_nexus_reset(struct domain_device *dev)
1474 {
1475 	int rc;
1476 	struct sas_phy *phy = sas_get_local_phy(dev);
1477 	int reset_type = (dev->dev_type == SATA_DEV ||
1478 			(dev->tproto & SAS_PROTOCOL_STP)) ? 0 : 1;
1479 	rc = sas_phy_reset(phy, reset_type);
1480 	sas_put_local_phy(phy);
1481 	msleep(2000);
1482 	return rc;
1483 }
1484 
1485 /* mandatory SAM-3 */
mvs_lu_reset(struct domain_device * dev,u8 * lun)1486 int mvs_lu_reset(struct domain_device *dev, u8 *lun)
1487 {
1488 	unsigned long flags;
1489 	int rc = TMF_RESP_FUNC_FAILED;
1490 	struct mvs_tmf_task tmf_task;
1491 	struct mvs_device * mvi_dev = dev->lldd_dev;
1492 	struct mvs_info *mvi = mvi_dev->mvi_info;
1493 
1494 	tmf_task.tmf = TMF_LU_RESET;
1495 	mvi_dev->dev_status = MVS_DEV_EH;
1496 	rc = mvs_debug_issue_ssp_tmf(dev, lun, &tmf_task);
1497 	if (rc == TMF_RESP_FUNC_COMPLETE) {
1498 		spin_lock_irqsave(&mvi->lock, flags);
1499 		mvs_release_task(mvi, dev);
1500 		spin_unlock_irqrestore(&mvi->lock, flags);
1501 	}
1502 	/* If failed, fall-through I_T_Nexus reset */
1503 	mv_printk("%s for device[%x]:rc= %d\n", __func__,
1504 			mvi_dev->device_id, rc);
1505 	return rc;
1506 }
1507 
mvs_I_T_nexus_reset(struct domain_device * dev)1508 int mvs_I_T_nexus_reset(struct domain_device *dev)
1509 {
1510 	unsigned long flags;
1511 	int rc = TMF_RESP_FUNC_FAILED;
1512     struct mvs_device * mvi_dev = (struct mvs_device *)dev->lldd_dev;
1513 	struct mvs_info *mvi = mvi_dev->mvi_info;
1514 
1515 	if (mvi_dev->dev_status != MVS_DEV_EH)
1516 		return TMF_RESP_FUNC_COMPLETE;
1517 	else
1518 		mvi_dev->dev_status = MVS_DEV_NORMAL;
1519 	rc = mvs_debug_I_T_nexus_reset(dev);
1520 	mv_printk("%s for device[%x]:rc= %d\n",
1521 		__func__, mvi_dev->device_id, rc);
1522 
1523 	spin_lock_irqsave(&mvi->lock, flags);
1524 	mvs_release_task(mvi, dev);
1525 	spin_unlock_irqrestore(&mvi->lock, flags);
1526 
1527 	return rc;
1528 }
1529 /* optional SAM-3 */
mvs_query_task(struct sas_task * task)1530 int mvs_query_task(struct sas_task *task)
1531 {
1532 	u32 tag;
1533 	struct scsi_lun lun;
1534 	struct mvs_tmf_task tmf_task;
1535 	int rc = TMF_RESP_FUNC_FAILED;
1536 
1537 	if (task->lldd_task && task->task_proto & SAS_PROTOCOL_SSP) {
1538 		struct scsi_cmnd * cmnd = (struct scsi_cmnd *)task->uldd_task;
1539 		struct domain_device *dev = task->dev;
1540 		struct mvs_device *mvi_dev = (struct mvs_device *)dev->lldd_dev;
1541 		struct mvs_info *mvi = mvi_dev->mvi_info;
1542 
1543 		int_to_scsilun(cmnd->device->lun, &lun);
1544 		rc = mvs_find_tag(mvi, task, &tag);
1545 		if (rc == 0) {
1546 			rc = TMF_RESP_FUNC_FAILED;
1547 			return rc;
1548 		}
1549 
1550 		tmf_task.tmf = TMF_QUERY_TASK;
1551 		tmf_task.tag_of_task_to_be_managed = cpu_to_le16(tag);
1552 
1553 		rc = mvs_debug_issue_ssp_tmf(dev, lun.scsi_lun, &tmf_task);
1554 		switch (rc) {
1555 		/* The task is still in Lun, release it then */
1556 		case TMF_RESP_FUNC_SUCC:
1557 		/* The task is not in Lun or failed, reset the phy */
1558 		case TMF_RESP_FUNC_FAILED:
1559 		case TMF_RESP_FUNC_COMPLETE:
1560 			break;
1561 		}
1562 	}
1563 	mv_printk("%s:rc= %d\n", __func__, rc);
1564 	return rc;
1565 }
1566 
1567 /*  mandatory SAM-3, still need free task/slot info */
mvs_abort_task(struct sas_task * task)1568 int mvs_abort_task(struct sas_task *task)
1569 {
1570 	struct scsi_lun lun;
1571 	struct mvs_tmf_task tmf_task;
1572 	struct domain_device *dev = task->dev;
1573 	struct mvs_device *mvi_dev = (struct mvs_device *)dev->lldd_dev;
1574 	struct mvs_info *mvi;
1575 	int rc = TMF_RESP_FUNC_FAILED;
1576 	unsigned long flags;
1577 	u32 tag;
1578 
1579 	if (!mvi_dev) {
1580 		mv_printk("Device has removed\n");
1581 		return TMF_RESP_FUNC_FAILED;
1582 	}
1583 
1584 	mvi = mvi_dev->mvi_info;
1585 
1586 	spin_lock_irqsave(&task->task_state_lock, flags);
1587 	if (task->task_state_flags & SAS_TASK_STATE_DONE) {
1588 		spin_unlock_irqrestore(&task->task_state_lock, flags);
1589 		rc = TMF_RESP_FUNC_COMPLETE;
1590 		goto out;
1591 	}
1592 	spin_unlock_irqrestore(&task->task_state_lock, flags);
1593 	mvi_dev->dev_status = MVS_DEV_EH;
1594 	if (task->lldd_task && task->task_proto & SAS_PROTOCOL_SSP) {
1595 		struct scsi_cmnd * cmnd = (struct scsi_cmnd *)task->uldd_task;
1596 
1597 		int_to_scsilun(cmnd->device->lun, &lun);
1598 		rc = mvs_find_tag(mvi, task, &tag);
1599 		if (rc == 0) {
1600 			mv_printk("No such tag in %s\n", __func__);
1601 			rc = TMF_RESP_FUNC_FAILED;
1602 			return rc;
1603 		}
1604 
1605 		tmf_task.tmf = TMF_ABORT_TASK;
1606 		tmf_task.tag_of_task_to_be_managed = cpu_to_le16(tag);
1607 
1608 		rc = mvs_debug_issue_ssp_tmf(dev, lun.scsi_lun, &tmf_task);
1609 
1610 		/* if successful, clear the task and callback forwards.*/
1611 		if (rc == TMF_RESP_FUNC_COMPLETE) {
1612 			u32 slot_no;
1613 			struct mvs_slot_info *slot;
1614 
1615 			if (task->lldd_task) {
1616 				slot = task->lldd_task;
1617 				slot_no = (u32) (slot - mvi->slot_info);
1618 				spin_lock_irqsave(&mvi->lock, flags);
1619 				mvs_slot_complete(mvi, slot_no, 1);
1620 				spin_unlock_irqrestore(&mvi->lock, flags);
1621 			}
1622 		}
1623 
1624 	} else if (task->task_proto & SAS_PROTOCOL_SATA ||
1625 		task->task_proto & SAS_PROTOCOL_STP) {
1626 		if (SATA_DEV == dev->dev_type) {
1627 			struct mvs_slot_info *slot = task->lldd_task;
1628 			u32 slot_idx = (u32)(slot - mvi->slot_info);
1629 			mv_dprintk("mvs_abort_task() mvi=%p task=%p "
1630 				   "slot=%p slot_idx=x%x\n",
1631 				   mvi, task, slot, slot_idx);
1632 			task->task_state_flags |= SAS_TASK_STATE_ABORTED;
1633 			mvs_slot_task_free(mvi, task, slot, slot_idx);
1634 			rc = TMF_RESP_FUNC_COMPLETE;
1635 			goto out;
1636 		}
1637 
1638 	}
1639 out:
1640 	if (rc != TMF_RESP_FUNC_COMPLETE)
1641 		mv_printk("%s:rc= %d\n", __func__, rc);
1642 	return rc;
1643 }
1644 
mvs_abort_task_set(struct domain_device * dev,u8 * lun)1645 int mvs_abort_task_set(struct domain_device *dev, u8 *lun)
1646 {
1647 	int rc = TMF_RESP_FUNC_FAILED;
1648 	struct mvs_tmf_task tmf_task;
1649 
1650 	tmf_task.tmf = TMF_ABORT_TASK_SET;
1651 	rc = mvs_debug_issue_ssp_tmf(dev, lun, &tmf_task);
1652 
1653 	return rc;
1654 }
1655 
mvs_clear_aca(struct domain_device * dev,u8 * lun)1656 int mvs_clear_aca(struct domain_device *dev, u8 *lun)
1657 {
1658 	int rc = TMF_RESP_FUNC_FAILED;
1659 	struct mvs_tmf_task tmf_task;
1660 
1661 	tmf_task.tmf = TMF_CLEAR_ACA;
1662 	rc = mvs_debug_issue_ssp_tmf(dev, lun, &tmf_task);
1663 
1664 	return rc;
1665 }
1666 
mvs_clear_task_set(struct domain_device * dev,u8 * lun)1667 int mvs_clear_task_set(struct domain_device *dev, u8 *lun)
1668 {
1669 	int rc = TMF_RESP_FUNC_FAILED;
1670 	struct mvs_tmf_task tmf_task;
1671 
1672 	tmf_task.tmf = TMF_CLEAR_TASK_SET;
1673 	rc = mvs_debug_issue_ssp_tmf(dev, lun, &tmf_task);
1674 
1675 	return rc;
1676 }
1677 
mvs_sata_done(struct mvs_info * mvi,struct sas_task * task,u32 slot_idx,int err)1678 static int mvs_sata_done(struct mvs_info *mvi, struct sas_task *task,
1679 			u32 slot_idx, int err)
1680 {
1681 	struct mvs_device *mvi_dev = task->dev->lldd_dev;
1682 	struct task_status_struct *tstat = &task->task_status;
1683 	struct ata_task_resp *resp = (struct ata_task_resp *)tstat->buf;
1684 	int stat = SAM_STAT_GOOD;
1685 
1686 
1687 	resp->frame_len = sizeof(struct dev_to_host_fis);
1688 	memcpy(&resp->ending_fis[0],
1689 	       SATA_RECEIVED_D2H_FIS(mvi_dev->taskfileset),
1690 	       sizeof(struct dev_to_host_fis));
1691 	tstat->buf_valid_size = sizeof(*resp);
1692 	if (unlikely(err)) {
1693 		if (unlikely(err & CMD_ISS_STPD))
1694 			stat = SAS_OPEN_REJECT;
1695 		else
1696 			stat = SAS_PROTO_RESPONSE;
1697        }
1698 
1699 	return stat;
1700 }
1701 
mvs_set_sense(u8 * buffer,int len,int d_sense,int key,int asc,int ascq)1702 void mvs_set_sense(u8 *buffer, int len, int d_sense,
1703 		int key, int asc, int ascq)
1704 {
1705 	memset(buffer, 0, len);
1706 
1707 	if (d_sense) {
1708 		/* Descriptor format */
1709 		if (len < 4) {
1710 			mv_printk("Length %d of sense buffer too small to "
1711 				"fit sense %x:%x:%x", len, key, asc, ascq);
1712 		}
1713 
1714 		buffer[0] = 0x72;		/* Response Code	*/
1715 		if (len > 1)
1716 			buffer[1] = key;	/* Sense Key */
1717 		if (len > 2)
1718 			buffer[2] = asc;	/* ASC	*/
1719 		if (len > 3)
1720 			buffer[3] = ascq;	/* ASCQ	*/
1721 	} else {
1722 		if (len < 14) {
1723 			mv_printk("Length %d of sense buffer too small to "
1724 				"fit sense %x:%x:%x", len, key, asc, ascq);
1725 		}
1726 
1727 		buffer[0] = 0x70;		/* Response Code	*/
1728 		if (len > 2)
1729 			buffer[2] = key;	/* Sense Key */
1730 		if (len > 7)
1731 			buffer[7] = 0x0a;	/* Additional Sense Length */
1732 		if (len > 12)
1733 			buffer[12] = asc;	/* ASC */
1734 		if (len > 13)
1735 			buffer[13] = ascq; /* ASCQ */
1736 	}
1737 
1738 	return;
1739 }
1740 
mvs_fill_ssp_resp_iu(struct ssp_response_iu * iu,u8 key,u8 asc,u8 asc_q)1741 void mvs_fill_ssp_resp_iu(struct ssp_response_iu *iu,
1742 				u8 key, u8 asc, u8 asc_q)
1743 {
1744 	iu->datapres = 2;
1745 	iu->response_data_len = 0;
1746 	iu->sense_data_len = 17;
1747 	iu->status = 02;
1748 	mvs_set_sense(iu->sense_data, 17, 0,
1749 			key, asc, asc_q);
1750 }
1751 
mvs_slot_err(struct mvs_info * mvi,struct sas_task * task,u32 slot_idx)1752 static int mvs_slot_err(struct mvs_info *mvi, struct sas_task *task,
1753 			 u32 slot_idx)
1754 {
1755 	struct mvs_slot_info *slot = &mvi->slot_info[slot_idx];
1756 	int stat;
1757 	u32 err_dw0 = le32_to_cpu(*(u32 *)slot->response);
1758 	u32 err_dw1 = le32_to_cpu(*((u32 *)slot->response + 1));
1759 	u32 tfs = 0;
1760 	enum mvs_port_type type = PORT_TYPE_SAS;
1761 
1762 	if (err_dw0 & CMD_ISS_STPD)
1763 		MVS_CHIP_DISP->issue_stop(mvi, type, tfs);
1764 
1765 	MVS_CHIP_DISP->command_active(mvi, slot_idx);
1766 
1767 	stat = SAM_STAT_CHECK_CONDITION;
1768 	switch (task->task_proto) {
1769 	case SAS_PROTOCOL_SSP:
1770 	{
1771 		stat = SAS_ABORTED_TASK;
1772 		if ((err_dw0 & NO_DEST) || err_dw1 & bit(31)) {
1773 			struct ssp_response_iu *iu = slot->response +
1774 				sizeof(struct mvs_err_info);
1775 			mvs_fill_ssp_resp_iu(iu, NOT_READY, 0x04, 01);
1776 			sas_ssp_task_response(mvi->dev, task, iu);
1777 			stat = SAM_STAT_CHECK_CONDITION;
1778 		}
1779 		if (err_dw1 & bit(31))
1780 			mv_printk("reuse same slot, retry command.\n");
1781 		break;
1782 	}
1783 	case SAS_PROTOCOL_SMP:
1784 		stat = SAM_STAT_CHECK_CONDITION;
1785 		break;
1786 
1787 	case SAS_PROTOCOL_SATA:
1788 	case SAS_PROTOCOL_STP:
1789 	case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP:
1790 	{
1791 		task->ata_task.use_ncq = 0;
1792 		stat = SAS_PROTO_RESPONSE;
1793 		mvs_sata_done(mvi, task, slot_idx, err_dw0);
1794 	}
1795 		break;
1796 	default:
1797 		break;
1798 	}
1799 
1800 	return stat;
1801 }
1802 
mvs_slot_complete(struct mvs_info * mvi,u32 rx_desc,u32 flags)1803 int mvs_slot_complete(struct mvs_info *mvi, u32 rx_desc, u32 flags)
1804 {
1805 	u32 slot_idx = rx_desc & RXQ_SLOT_MASK;
1806 	struct mvs_slot_info *slot = &mvi->slot_info[slot_idx];
1807 	struct sas_task *task = slot->task;
1808 	struct mvs_device *mvi_dev = NULL;
1809 	struct task_status_struct *tstat;
1810 	struct domain_device *dev;
1811 	u32 aborted;
1812 
1813 	void *to;
1814 	enum exec_status sts;
1815 
1816 	if (unlikely(!task || !task->lldd_task || !task->dev))
1817 		return -1;
1818 
1819 	tstat = &task->task_status;
1820 	dev = task->dev;
1821 	mvi_dev = dev->lldd_dev;
1822 
1823 	spin_lock(&task->task_state_lock);
1824 	task->task_state_flags &=
1825 		~(SAS_TASK_STATE_PENDING | SAS_TASK_AT_INITIATOR);
1826 	task->task_state_flags |= SAS_TASK_STATE_DONE;
1827 	/* race condition*/
1828 	aborted = task->task_state_flags & SAS_TASK_STATE_ABORTED;
1829 	spin_unlock(&task->task_state_lock);
1830 
1831 	memset(tstat, 0, sizeof(*tstat));
1832 	tstat->resp = SAS_TASK_COMPLETE;
1833 
1834 	if (unlikely(aborted)) {
1835 		tstat->stat = SAS_ABORTED_TASK;
1836 		if (mvi_dev && mvi_dev->running_req)
1837 			mvi_dev->running_req--;
1838 		if (sas_protocol_ata(task->task_proto))
1839 			mvs_free_reg_set(mvi, mvi_dev);
1840 
1841 		mvs_slot_task_free(mvi, task, slot, slot_idx);
1842 		return -1;
1843 	}
1844 
1845 	/* when no device attaching, go ahead and complete by error handling*/
1846 	if (unlikely(!mvi_dev || flags)) {
1847 		if (!mvi_dev)
1848 			mv_dprintk("port has not device.\n");
1849 		tstat->stat = SAS_PHY_DOWN;
1850 		goto out;
1851 	}
1852 
1853 	/* error info record present */
1854 	if (unlikely((rx_desc & RXQ_ERR) && (*(u64 *) slot->response))) {
1855 		mv_dprintk("port %d slot %d rx_desc %X has error info"
1856 			"%016llX.\n", slot->port->sas_port.id, slot_idx,
1857 			 rx_desc, (u64)(*(u64 *)slot->response));
1858 		tstat->stat = mvs_slot_err(mvi, task, slot_idx);
1859 		tstat->resp = SAS_TASK_COMPLETE;
1860 		goto out;
1861 	}
1862 
1863 	switch (task->task_proto) {
1864 	case SAS_PROTOCOL_SSP:
1865 		/* hw says status == 0, datapres == 0 */
1866 		if (rx_desc & RXQ_GOOD) {
1867 			tstat->stat = SAM_STAT_GOOD;
1868 			tstat->resp = SAS_TASK_COMPLETE;
1869 		}
1870 		/* response frame present */
1871 		else if (rx_desc & RXQ_RSP) {
1872 			struct ssp_response_iu *iu = slot->response +
1873 						sizeof(struct mvs_err_info);
1874 			sas_ssp_task_response(mvi->dev, task, iu);
1875 		} else
1876 			tstat->stat = SAM_STAT_CHECK_CONDITION;
1877 		break;
1878 
1879 	case SAS_PROTOCOL_SMP: {
1880 			struct scatterlist *sg_resp = &task->smp_task.smp_resp;
1881 			tstat->stat = SAM_STAT_GOOD;
1882 			to = kmap_atomic(sg_page(sg_resp));
1883 			memcpy(to + sg_resp->offset,
1884 				slot->response + sizeof(struct mvs_err_info),
1885 				sg_dma_len(sg_resp));
1886 			kunmap_atomic(to);
1887 			break;
1888 		}
1889 
1890 	case SAS_PROTOCOL_SATA:
1891 	case SAS_PROTOCOL_STP:
1892 	case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP: {
1893 			tstat->stat = mvs_sata_done(mvi, task, slot_idx, 0);
1894 			break;
1895 		}
1896 
1897 	default:
1898 		tstat->stat = SAM_STAT_CHECK_CONDITION;
1899 		break;
1900 	}
1901 	if (!slot->port->port_attached) {
1902 		mv_dprintk("port %d has removed.\n", slot->port->sas_port.id);
1903 		tstat->stat = SAS_PHY_DOWN;
1904 	}
1905 
1906 
1907 out:
1908 	if (mvi_dev && mvi_dev->running_req) {
1909 		mvi_dev->running_req--;
1910 		if (sas_protocol_ata(task->task_proto) && !mvi_dev->running_req)
1911 			mvs_free_reg_set(mvi, mvi_dev);
1912 	}
1913 	mvs_slot_task_free(mvi, task, slot, slot_idx);
1914 	sts = tstat->stat;
1915 
1916 	spin_unlock(&mvi->lock);
1917 	if (task->task_done)
1918 		task->task_done(task);
1919 
1920 	spin_lock(&mvi->lock);
1921 
1922 	return sts;
1923 }
1924 
mvs_do_release_task(struct mvs_info * mvi,int phy_no,struct domain_device * dev)1925 void mvs_do_release_task(struct mvs_info *mvi,
1926 		int phy_no, struct domain_device *dev)
1927 {
1928 	u32 slot_idx;
1929 	struct mvs_phy *phy;
1930 	struct mvs_port *port;
1931 	struct mvs_slot_info *slot, *slot2;
1932 
1933 	phy = &mvi->phy[phy_no];
1934 	port = phy->port;
1935 	if (!port)
1936 		return;
1937 	/* clean cmpl queue in case request is already finished */
1938 	mvs_int_rx(mvi, false);
1939 
1940 
1941 
1942 	list_for_each_entry_safe(slot, slot2, &port->list, entry) {
1943 		struct sas_task *task;
1944 		slot_idx = (u32) (slot - mvi->slot_info);
1945 		task = slot->task;
1946 
1947 		if (dev && task->dev != dev)
1948 			continue;
1949 
1950 		mv_printk("Release slot [%x] tag[%x], task [%p]:\n",
1951 			slot_idx, slot->slot_tag, task);
1952 		MVS_CHIP_DISP->command_active(mvi, slot_idx);
1953 
1954 		mvs_slot_complete(mvi, slot_idx, 1);
1955 	}
1956 }
1957 
mvs_release_task(struct mvs_info * mvi,struct domain_device * dev)1958 void mvs_release_task(struct mvs_info *mvi,
1959 		      struct domain_device *dev)
1960 {
1961 	int i, phyno[WIDE_PORT_MAX_PHY], num;
1962 	num = mvs_find_dev_phyno(dev, phyno);
1963 	for (i = 0; i < num; i++)
1964 		mvs_do_release_task(mvi, phyno[i], dev);
1965 }
1966 
mvs_phy_disconnected(struct mvs_phy * phy)1967 static void mvs_phy_disconnected(struct mvs_phy *phy)
1968 {
1969 	phy->phy_attached = 0;
1970 	phy->att_dev_info = 0;
1971 	phy->att_dev_sas_addr = 0;
1972 }
1973 
mvs_work_queue(struct work_struct * work)1974 static void mvs_work_queue(struct work_struct *work)
1975 {
1976 	struct delayed_work *dw = container_of(work, struct delayed_work, work);
1977 	struct mvs_wq *mwq = container_of(dw, struct mvs_wq, work_q);
1978 	struct mvs_info *mvi = mwq->mvi;
1979 	unsigned long flags;
1980 	u32 phy_no = (unsigned long) mwq->data;
1981 	struct sas_ha_struct *sas_ha = mvi->sas;
1982 	struct mvs_phy *phy = &mvi->phy[phy_no];
1983 	struct asd_sas_phy *sas_phy = &phy->sas_phy;
1984 
1985 	spin_lock_irqsave(&mvi->lock, flags);
1986 	if (mwq->handler & PHY_PLUG_EVENT) {
1987 
1988 		if (phy->phy_event & PHY_PLUG_OUT) {
1989 			u32 tmp;
1990 			struct sas_identify_frame *id;
1991 			id = (struct sas_identify_frame *)phy->frame_rcvd;
1992 			tmp = MVS_CHIP_DISP->read_phy_ctl(mvi, phy_no);
1993 			phy->phy_event &= ~PHY_PLUG_OUT;
1994 			if (!(tmp & PHY_READY_MASK)) {
1995 				sas_phy_disconnected(sas_phy);
1996 				mvs_phy_disconnected(phy);
1997 				sas_ha->notify_phy_event(sas_phy,
1998 					PHYE_LOSS_OF_SIGNAL);
1999 				mv_dprintk("phy%d Removed Device\n", phy_no);
2000 			} else {
2001 				MVS_CHIP_DISP->detect_porttype(mvi, phy_no);
2002 				mvs_update_phyinfo(mvi, phy_no, 1);
2003 				mvs_bytes_dmaed(mvi, phy_no);
2004 				mvs_port_notify_formed(sas_phy, 0);
2005 				mv_dprintk("phy%d Attached Device\n", phy_no);
2006 			}
2007 		}
2008 	} else if (mwq->handler & EXP_BRCT_CHG) {
2009 		phy->phy_event &= ~EXP_BRCT_CHG;
2010 		sas_ha->notify_port_event(sas_phy,
2011 				PORTE_BROADCAST_RCVD);
2012 		mv_dprintk("phy%d Got Broadcast Change\n", phy_no);
2013 	}
2014 	list_del(&mwq->entry);
2015 	spin_unlock_irqrestore(&mvi->lock, flags);
2016 	kfree(mwq);
2017 }
2018 
mvs_handle_event(struct mvs_info * mvi,void * data,int handler)2019 static int mvs_handle_event(struct mvs_info *mvi, void *data, int handler)
2020 {
2021 	struct mvs_wq *mwq;
2022 	int ret = 0;
2023 
2024 	mwq = kmalloc(sizeof(struct mvs_wq), GFP_ATOMIC);
2025 	if (mwq) {
2026 		mwq->mvi = mvi;
2027 		mwq->data = data;
2028 		mwq->handler = handler;
2029 		MV_INIT_DELAYED_WORK(&mwq->work_q, mvs_work_queue, mwq);
2030 		list_add_tail(&mwq->entry, &mvi->wq_list);
2031 		schedule_delayed_work(&mwq->work_q, HZ * 2);
2032 	} else
2033 		ret = -ENOMEM;
2034 
2035 	return ret;
2036 }
2037 
mvs_sig_time_out(unsigned long tphy)2038 static void mvs_sig_time_out(unsigned long tphy)
2039 {
2040 	struct mvs_phy *phy = (struct mvs_phy *)tphy;
2041 	struct mvs_info *mvi = phy->mvi;
2042 	u8 phy_no;
2043 
2044 	for (phy_no = 0; phy_no < mvi->chip->n_phy; phy_no++) {
2045 		if (&mvi->phy[phy_no] == phy) {
2046 			mv_dprintk("Get signature time out, reset phy %d\n",
2047 				phy_no+mvi->id*mvi->chip->n_phy);
2048 			MVS_CHIP_DISP->phy_reset(mvi, phy_no, MVS_HARD_RESET);
2049 		}
2050 	}
2051 }
2052 
mvs_int_port(struct mvs_info * mvi,int phy_no,u32 events)2053 void mvs_int_port(struct mvs_info *mvi, int phy_no, u32 events)
2054 {
2055 	u32 tmp;
2056 	struct mvs_phy *phy = &mvi->phy[phy_no];
2057 
2058 	phy->irq_status = MVS_CHIP_DISP->read_port_irq_stat(mvi, phy_no);
2059 	MVS_CHIP_DISP->write_port_irq_stat(mvi, phy_no, phy->irq_status);
2060 	mv_dprintk("phy %d ctrl sts=0x%08X.\n", phy_no+mvi->id*mvi->chip->n_phy,
2061 		MVS_CHIP_DISP->read_phy_ctl(mvi, phy_no));
2062 	mv_dprintk("phy %d irq sts = 0x%08X\n", phy_no+mvi->id*mvi->chip->n_phy,
2063 		phy->irq_status);
2064 
2065 	/*
2066 	* events is port event now ,
2067 	* we need check the interrupt status which belongs to per port.
2068 	*/
2069 
2070 	if (phy->irq_status & PHYEV_DCDR_ERR) {
2071 		mv_dprintk("phy %d STP decoding error.\n",
2072 		phy_no + mvi->id*mvi->chip->n_phy);
2073 	}
2074 
2075 	if (phy->irq_status & PHYEV_POOF) {
2076 		mdelay(500);
2077 		if (!(phy->phy_event & PHY_PLUG_OUT)) {
2078 			int dev_sata = phy->phy_type & PORT_TYPE_SATA;
2079 			int ready;
2080 			mvs_do_release_task(mvi, phy_no, NULL);
2081 			phy->phy_event |= PHY_PLUG_OUT;
2082 			MVS_CHIP_DISP->clear_srs_irq(mvi, 0, 1);
2083 			mvs_handle_event(mvi,
2084 				(void *)(unsigned long)phy_no,
2085 				PHY_PLUG_EVENT);
2086 			ready = mvs_is_phy_ready(mvi, phy_no);
2087 			if (ready || dev_sata) {
2088 				if (MVS_CHIP_DISP->stp_reset)
2089 					MVS_CHIP_DISP->stp_reset(mvi,
2090 							phy_no);
2091 				else
2092 					MVS_CHIP_DISP->phy_reset(mvi,
2093 							phy_no, MVS_SOFT_RESET);
2094 				return;
2095 			}
2096 		}
2097 	}
2098 
2099 	if (phy->irq_status & PHYEV_COMWAKE) {
2100 		tmp = MVS_CHIP_DISP->read_port_irq_mask(mvi, phy_no);
2101 		MVS_CHIP_DISP->write_port_irq_mask(mvi, phy_no,
2102 					tmp | PHYEV_SIG_FIS);
2103 		if (phy->timer.function == NULL) {
2104 			phy->timer.data = (unsigned long)phy;
2105 			phy->timer.function = mvs_sig_time_out;
2106 			phy->timer.expires = jiffies + 5*HZ;
2107 			add_timer(&phy->timer);
2108 		}
2109 	}
2110 	if (phy->irq_status & (PHYEV_SIG_FIS | PHYEV_ID_DONE)) {
2111 		phy->phy_status = mvs_is_phy_ready(mvi, phy_no);
2112 		mv_dprintk("notify plug in on phy[%d]\n", phy_no);
2113 		if (phy->phy_status) {
2114 			mdelay(10);
2115 			MVS_CHIP_DISP->detect_porttype(mvi, phy_no);
2116 			if (phy->phy_type & PORT_TYPE_SATA) {
2117 				tmp = MVS_CHIP_DISP->read_port_irq_mask(
2118 						mvi, phy_no);
2119 				tmp &= ~PHYEV_SIG_FIS;
2120 				MVS_CHIP_DISP->write_port_irq_mask(mvi,
2121 							phy_no, tmp);
2122 			}
2123 			mvs_update_phyinfo(mvi, phy_no, 0);
2124 			if (phy->phy_type & PORT_TYPE_SAS) {
2125 				MVS_CHIP_DISP->phy_reset(mvi, phy_no, MVS_PHY_TUNE);
2126 				mdelay(10);
2127 			}
2128 
2129 			mvs_bytes_dmaed(mvi, phy_no);
2130 			/* whether driver is going to handle hot plug */
2131 			if (phy->phy_event & PHY_PLUG_OUT) {
2132 				mvs_port_notify_formed(&phy->sas_phy, 0);
2133 				phy->phy_event &= ~PHY_PLUG_OUT;
2134 			}
2135 		} else {
2136 			mv_dprintk("plugin interrupt but phy%d is gone\n",
2137 				phy_no + mvi->id*mvi->chip->n_phy);
2138 		}
2139 	} else if (phy->irq_status & PHYEV_BROAD_CH) {
2140 		mv_dprintk("phy %d broadcast change.\n",
2141 			phy_no + mvi->id*mvi->chip->n_phy);
2142 		mvs_handle_event(mvi, (void *)(unsigned long)phy_no,
2143 				EXP_BRCT_CHG);
2144 	}
2145 }
2146 
mvs_int_rx(struct mvs_info * mvi,bool self_clear)2147 int mvs_int_rx(struct mvs_info *mvi, bool self_clear)
2148 {
2149 	u32 rx_prod_idx, rx_desc;
2150 	bool attn = false;
2151 
2152 	/* the first dword in the RX ring is special: it contains
2153 	 * a mirror of the hardware's RX producer index, so that
2154 	 * we don't have to stall the CPU reading that register.
2155 	 * The actual RX ring is offset by one dword, due to this.
2156 	 */
2157 	rx_prod_idx = mvi->rx_cons;
2158 	mvi->rx_cons = le32_to_cpu(mvi->rx[0]);
2159 	if (mvi->rx_cons == 0xfff)	/* h/w hasn't touched RX ring yet */
2160 		return 0;
2161 
2162 	/* The CMPL_Q may come late, read from register and try again
2163 	* note: if coalescing is enabled,
2164 	* it will need to read from register every time for sure
2165 	*/
2166 	if (unlikely(mvi->rx_cons == rx_prod_idx))
2167 		mvi->rx_cons = MVS_CHIP_DISP->rx_update(mvi) & RX_RING_SZ_MASK;
2168 
2169 	if (mvi->rx_cons == rx_prod_idx)
2170 		return 0;
2171 
2172 	while (mvi->rx_cons != rx_prod_idx) {
2173 		/* increment our internal RX consumer pointer */
2174 		rx_prod_idx = (rx_prod_idx + 1) & (MVS_RX_RING_SZ - 1);
2175 		rx_desc = le32_to_cpu(mvi->rx[rx_prod_idx + 1]);
2176 
2177 		if (likely(rx_desc & RXQ_DONE))
2178 			mvs_slot_complete(mvi, rx_desc, 0);
2179 		if (rx_desc & RXQ_ATTN) {
2180 			attn = true;
2181 		} else if (rx_desc & RXQ_ERR) {
2182 			if (!(rx_desc & RXQ_DONE))
2183 				mvs_slot_complete(mvi, rx_desc, 0);
2184 		} else if (rx_desc & RXQ_SLOT_RESET) {
2185 			mvs_slot_free(mvi, rx_desc);
2186 		}
2187 	}
2188 
2189 	if (attn && self_clear)
2190 		MVS_CHIP_DISP->int_full(mvi);
2191 	return 0;
2192 }
2193 
2194