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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2003-2022, Intel Corporation. All rights reserved.
4 * Intel Management Engine Interface (Intel MEI) Linux driver
5 */
6#include <linux/export.h>
7#include <linux/sched.h>
8#include <linux/wait.h>
9#include <linux/pm_runtime.h>
10#include <linux/slab.h>
11
12#include <linux/mei.h>
13
14#include "mei_dev.h"
15#include "hbm.h"
16#include "client.h"
17
18static const char *mei_hbm_status_str(enum mei_hbm_status status)
19{
20#define MEI_HBM_STATUS(status) case MEI_HBMS_##status: return #status
21 switch (status) {
22 MEI_HBM_STATUS(SUCCESS);
23 MEI_HBM_STATUS(CLIENT_NOT_FOUND);
24 MEI_HBM_STATUS(ALREADY_EXISTS);
25 MEI_HBM_STATUS(REJECTED);
26 MEI_HBM_STATUS(INVALID_PARAMETER);
27 MEI_HBM_STATUS(NOT_ALLOWED);
28 MEI_HBM_STATUS(ALREADY_STARTED);
29 MEI_HBM_STATUS(NOT_STARTED);
30 default: return "unknown";
31 }
32#undef MEI_HBM_STATUS
33};
34
35static const char *mei_cl_conn_status_str(enum mei_cl_connect_status status)
36{
37#define MEI_CL_CS(status) case MEI_CL_CONN_##status: return #status
38 switch (status) {
39 MEI_CL_CS(SUCCESS);
40 MEI_CL_CS(NOT_FOUND);
41 MEI_CL_CS(ALREADY_STARTED);
42 MEI_CL_CS(OUT_OF_RESOURCES);
43 MEI_CL_CS(MESSAGE_SMALL);
44 MEI_CL_CS(NOT_ALLOWED);
45 default: return "unknown";
46 }
47#undef MEI_CL_CCS
48}
49
50const char *mei_hbm_state_str(enum mei_hbm_state state)
51{
52#define MEI_HBM_STATE(state) case MEI_HBM_##state: return #state
53 switch (state) {
54 MEI_HBM_STATE(IDLE);
55 MEI_HBM_STATE(STARTING);
56 MEI_HBM_STATE(STARTED);
57 MEI_HBM_STATE(DR_SETUP);
58 MEI_HBM_STATE(ENUM_CLIENTS);
59 MEI_HBM_STATE(CLIENT_PROPERTIES);
60 MEI_HBM_STATE(STOPPED);
61 default:
62 return "unknown";
63 }
64#undef MEI_HBM_STATE
65}
66
67/**
68 * mei_cl_conn_status_to_errno - convert client connect response
69 * status to error code
70 *
71 * @status: client connect response status
72 *
73 * Return: corresponding error code
74 */
75static int mei_cl_conn_status_to_errno(enum mei_cl_connect_status status)
76{
77 switch (status) {
78 case MEI_CL_CONN_SUCCESS: return 0;
79 case MEI_CL_CONN_NOT_FOUND: return -ENOTTY;
80 case MEI_CL_CONN_ALREADY_STARTED: return -EBUSY;
81 case MEI_CL_CONN_OUT_OF_RESOURCES: return -EBUSY;
82 case MEI_CL_CONN_MESSAGE_SMALL: return -EINVAL;
83 case MEI_CL_CONN_NOT_ALLOWED: return -EBUSY;
84 default: return -EINVAL;
85 }
86}
87
88/**
89 * mei_hbm_write_message - wrapper for sending hbm messages.
90 *
91 * @dev: mei device
92 * @hdr: mei header
93 * @data: payload
94 *
95 * Return: >=0 on success, <0 on error
96 */
97static inline int mei_hbm_write_message(struct mei_device *dev,
98 struct mei_msg_hdr *hdr,
99 const void *data)
100{
101 return mei_write_message(dev, hdr, sizeof(*hdr), data, hdr->length);
102}
103
104/**
105 * mei_hbm_idle - set hbm to idle state
106 *
107 * @dev: the device structure
108 */
109void mei_hbm_idle(struct mei_device *dev)
110{
111 dev->init_clients_timer = 0;
112 dev->hbm_state = MEI_HBM_IDLE;
113}
114
115/**
116 * mei_hbm_reset - reset hbm counters and book keeping data structures
117 *
118 * @dev: the device structure
119 */
120void mei_hbm_reset(struct mei_device *dev)
121{
122 mei_me_cl_rm_all(dev);
123
124 mei_hbm_idle(dev);
125}
126
127/**
128 * mei_hbm_hdr - construct hbm header
129 *
130 * @mei_hdr: hbm header
131 * @length: payload length
132 */
133
134static inline void mei_hbm_hdr(struct mei_msg_hdr *mei_hdr, size_t length)
135{
136 memset(mei_hdr, 0, sizeof(*mei_hdr));
137 mei_hdr->length = length;
138 mei_hdr->msg_complete = 1;
139}
140
141/**
142 * mei_hbm_cl_hdr - construct client hbm header
143 *
144 * @cl: client
145 * @hbm_cmd: host bus message command
146 * @buf: buffer for cl header
147 * @len: buffer length
148 */
149static inline
150void mei_hbm_cl_hdr(struct mei_cl *cl, u8 hbm_cmd, void *buf, size_t len)
151{
152 struct mei_hbm_cl_cmd *cmd = buf;
153
154 memset(cmd, 0, len);
155
156 cmd->hbm_cmd = hbm_cmd;
157 cmd->host_addr = mei_cl_host_addr(cl);
158 cmd->me_addr = mei_cl_me_id(cl);
159}
160
161/**
162 * mei_hbm_cl_write - write simple hbm client message
163 *
164 * @dev: the device structure
165 * @cl: client
166 * @hbm_cmd: host bus message command
167 * @buf: message buffer
168 * @len: buffer length
169 *
170 * Return: 0 on success, <0 on failure.
171 */
172static inline int mei_hbm_cl_write(struct mei_device *dev, struct mei_cl *cl,
173 u8 hbm_cmd, void *buf, size_t len)
174{
175 struct mei_msg_hdr mei_hdr;
176
177 mei_hbm_hdr(&mei_hdr, len);
178 mei_hbm_cl_hdr(cl, hbm_cmd, buf, len);
179
180 return mei_hbm_write_message(dev, &mei_hdr, buf);
181}
182
183/**
184 * mei_hbm_cl_addr_equal - check if the client's and
185 * the message address match
186 *
187 * @cl: client
188 * @cmd: hbm client message
189 *
190 * Return: true if addresses are the same
191 */
192static inline
193bool mei_hbm_cl_addr_equal(struct mei_cl *cl, struct mei_hbm_cl_cmd *cmd)
194{
195 return mei_cl_host_addr(cl) == cmd->host_addr &&
196 mei_cl_me_id(cl) == cmd->me_addr;
197}
198
199/**
200 * mei_hbm_cl_find_by_cmd - find recipient client
201 *
202 * @dev: the device structure
203 * @buf: a buffer with hbm cl command
204 *
205 * Return: the recipient client or NULL if not found
206 */
207static inline
208struct mei_cl *mei_hbm_cl_find_by_cmd(struct mei_device *dev, void *buf)
209{
210 struct mei_hbm_cl_cmd *cmd = (struct mei_hbm_cl_cmd *)buf;
211 struct mei_cl *cl;
212
213 list_for_each_entry(cl, &dev->file_list, link)
214 if (mei_hbm_cl_addr_equal(cl, cmd))
215 return cl;
216 return NULL;
217}
218
219
220/**
221 * mei_hbm_start_wait - wait for start response message.
222 *
223 * @dev: the device structure
224 *
225 * Return: 0 on success and < 0 on failure
226 */
227int mei_hbm_start_wait(struct mei_device *dev)
228{
229 int ret;
230
231 if (dev->hbm_state > MEI_HBM_STARTING)
232 return 0;
233
234 mutex_unlock(&dev->device_lock);
235 ret = wait_event_timeout(dev->wait_hbm_start,
236 dev->hbm_state != MEI_HBM_STARTING,
237 dev->timeouts.hbm);
238 mutex_lock(&dev->device_lock);
239
240 if (ret == 0 && (dev->hbm_state <= MEI_HBM_STARTING)) {
241 dev->hbm_state = MEI_HBM_IDLE;
242 dev_err(dev->dev, "waiting for mei start failed\n");
243 return -ETIME;
244 }
245 return 0;
246}
247
248/**
249 * mei_hbm_start_req - sends start request message.
250 *
251 * @dev: the device structure
252 *
253 * Return: 0 on success and < 0 on failure
254 */
255int mei_hbm_start_req(struct mei_device *dev)
256{
257 struct mei_msg_hdr mei_hdr;
258 struct hbm_host_version_request req;
259 int ret;
260
261 mei_hbm_reset(dev);
262
263 mei_hbm_hdr(&mei_hdr, sizeof(req));
264
265 /* host start message */
266 memset(&req, 0, sizeof(req));
267 req.hbm_cmd = HOST_START_REQ_CMD;
268 req.host_version.major_version = HBM_MAJOR_VERSION;
269 req.host_version.minor_version = HBM_MINOR_VERSION;
270
271 dev->hbm_state = MEI_HBM_IDLE;
272 ret = mei_hbm_write_message(dev, &mei_hdr, &req);
273 if (ret) {
274 dev_err(dev->dev, "version message write failed: ret = %d\n",
275 ret);
276 return ret;
277 }
278
279 dev->hbm_state = MEI_HBM_STARTING;
280 dev->init_clients_timer = dev->timeouts.client_init;
281 mei_schedule_stall_timer(dev);
282 return 0;
283}
284
285/**
286 * mei_hbm_dma_setup_req() - setup DMA request
287 * @dev: the device structure
288 *
289 * Return: 0 on success and < 0 on failure
290 */
291static int mei_hbm_dma_setup_req(struct mei_device *dev)
292{
293 struct mei_msg_hdr mei_hdr;
294 struct hbm_dma_setup_request req;
295 unsigned int i;
296 int ret;
297
298 mei_hbm_hdr(&mei_hdr, sizeof(req));
299
300 memset(&req, 0, sizeof(req));
301 req.hbm_cmd = MEI_HBM_DMA_SETUP_REQ_CMD;
302 for (i = 0; i < DMA_DSCR_NUM; i++) {
303 phys_addr_t paddr;
304
305 paddr = dev->dr_dscr[i].daddr;
306 req.dma_dscr[i].addr_hi = upper_32_bits(paddr);
307 req.dma_dscr[i].addr_lo = lower_32_bits(paddr);
308 req.dma_dscr[i].size = dev->dr_dscr[i].size;
309 }
310
311 mei_dma_ring_reset(dev);
312
313 ret = mei_hbm_write_message(dev, &mei_hdr, &req);
314 if (ret) {
315 dev_err(dev->dev, "dma setup request write failed: ret = %d.\n",
316 ret);
317 return ret;
318 }
319
320 dev->hbm_state = MEI_HBM_DR_SETUP;
321 dev->init_clients_timer = dev->timeouts.client_init;
322 mei_schedule_stall_timer(dev);
323 return 0;
324}
325
326/**
327 * mei_hbm_capabilities_req - request capabilities
328 *
329 * @dev: the device structure
330 *
331 * Return: 0 on success and < 0 on failure
332 */
333static int mei_hbm_capabilities_req(struct mei_device *dev)
334{
335 struct mei_msg_hdr mei_hdr;
336 struct hbm_capability_request req;
337 int ret;
338
339 mei_hbm_hdr(&mei_hdr, sizeof(req));
340
341 memset(&req, 0, sizeof(req));
342 req.hbm_cmd = MEI_HBM_CAPABILITIES_REQ_CMD;
343 if (dev->hbm_f_vt_supported)
344 req.capability_requested[0] |= HBM_CAP_VT;
345
346 if (dev->hbm_f_cd_supported)
347 req.capability_requested[0] |= HBM_CAP_CD;
348
349 if (dev->hbm_f_gsc_supported)
350 req.capability_requested[0] |= HBM_CAP_GSC;
351
352 ret = mei_hbm_write_message(dev, &mei_hdr, &req);
353 if (ret) {
354 dev_err(dev->dev,
355 "capabilities request write failed: ret = %d.\n", ret);
356 return ret;
357 }
358
359 dev->hbm_state = MEI_HBM_CAP_SETUP;
360 dev->init_clients_timer = dev->timeouts.client_init;
361 mei_schedule_stall_timer(dev);
362 return 0;
363}
364
365/**
366 * mei_hbm_enum_clients_req - sends enumeration client request message.
367 *
368 * @dev: the device structure
369 *
370 * Return: 0 on success and < 0 on failure
371 */
372static int mei_hbm_enum_clients_req(struct mei_device *dev)
373{
374 struct mei_msg_hdr mei_hdr;
375 struct hbm_host_enum_request req;
376 int ret;
377
378 /* enumerate clients */
379 mei_hbm_hdr(&mei_hdr, sizeof(req));
380
381 memset(&req, 0, sizeof(req));
382 req.hbm_cmd = HOST_ENUM_REQ_CMD;
383 req.flags |= dev->hbm_f_dc_supported ? MEI_HBM_ENUM_F_ALLOW_ADD : 0;
384 req.flags |= dev->hbm_f_ie_supported ?
385 MEI_HBM_ENUM_F_IMMEDIATE_ENUM : 0;
386
387 ret = mei_hbm_write_message(dev, &mei_hdr, &req);
388 if (ret) {
389 dev_err(dev->dev, "enumeration request write failed: ret = %d.\n",
390 ret);
391 return ret;
392 }
393 dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
394 dev->init_clients_timer = dev->timeouts.client_init;
395 mei_schedule_stall_timer(dev);
396 return 0;
397}
398
399/**
400 * mei_hbm_me_cl_add - add new me client to the list
401 *
402 * @dev: the device structure
403 * @res: hbm property response
404 *
405 * Return: 0 on success and -ENOMEM on allocation failure
406 */
407
408static int mei_hbm_me_cl_add(struct mei_device *dev,
409 struct hbm_props_response *res)
410{
411 struct mei_me_client *me_cl;
412 const uuid_le *uuid = &res->client_properties.protocol_name;
413
414 mei_me_cl_rm_by_uuid(dev, uuid);
415
416 me_cl = kzalloc(sizeof(*me_cl), GFP_KERNEL);
417 if (!me_cl)
418 return -ENOMEM;
419
420 mei_me_cl_init(me_cl);
421
422 me_cl->props = res->client_properties;
423 me_cl->client_id = res->me_addr;
424 me_cl->tx_flow_ctrl_creds = 0;
425
426 mei_me_cl_add(dev, me_cl);
427
428 return 0;
429}
430
431/**
432 * mei_hbm_add_cl_resp - send response to fw on client add request
433 *
434 * @dev: the device structure
435 * @addr: me address
436 * @status: response status
437 *
438 * Return: 0 on success and < 0 on failure
439 */
440static int mei_hbm_add_cl_resp(struct mei_device *dev, u8 addr, u8 status)
441{
442 struct mei_msg_hdr mei_hdr;
443 struct hbm_add_client_response resp;
444 int ret;
445
446 dev_dbg(dev->dev, "adding client response\n");
447
448 mei_hbm_hdr(&mei_hdr, sizeof(resp));
449
450 memset(&resp, 0, sizeof(resp));
451 resp.hbm_cmd = MEI_HBM_ADD_CLIENT_RES_CMD;
452 resp.me_addr = addr;
453 resp.status = status;
454
455 ret = mei_hbm_write_message(dev, &mei_hdr, &resp);
456 if (ret)
457 dev_err(dev->dev, "add client response write failed: ret = %d\n",
458 ret);
459 return ret;
460}
461
462/**
463 * mei_hbm_fw_add_cl_req - request from the fw to add a client
464 *
465 * @dev: the device structure
466 * @req: add client request
467 *
468 * Return: 0 on success and < 0 on failure
469 */
470static int mei_hbm_fw_add_cl_req(struct mei_device *dev,
471 struct hbm_add_client_request *req)
472{
473 int ret;
474 u8 status = MEI_HBMS_SUCCESS;
475
476 BUILD_BUG_ON(sizeof(struct hbm_add_client_request) !=
477 sizeof(struct hbm_props_response));
478
479 ret = mei_hbm_me_cl_add(dev, (struct hbm_props_response *)req);
480 if (ret)
481 status = !MEI_HBMS_SUCCESS;
482
483 if (dev->dev_state == MEI_DEV_ENABLED)
484 schedule_work(&dev->bus_rescan_work);
485
486 return mei_hbm_add_cl_resp(dev, req->me_addr, status);
487}
488
489/**
490 * mei_hbm_cl_notify_req - send notification request
491 *
492 * @dev: the device structure
493 * @cl: a client to disconnect from
494 * @start: true for start false for stop
495 *
496 * Return: 0 on success and -EIO on write failure
497 */
498int mei_hbm_cl_notify_req(struct mei_device *dev,
499 struct mei_cl *cl, u8 start)
500{
501
502 struct mei_msg_hdr mei_hdr;
503 struct hbm_notification_request req;
504 int ret;
505
506 mei_hbm_hdr(&mei_hdr, sizeof(req));
507 mei_hbm_cl_hdr(cl, MEI_HBM_NOTIFY_REQ_CMD, &req, sizeof(req));
508
509 req.start = start;
510
511 ret = mei_hbm_write_message(dev, &mei_hdr, &req);
512 if (ret)
513 dev_err(dev->dev, "notify request failed: ret = %d\n", ret);
514
515 return ret;
516}
517
518/**
519 * notify_res_to_fop - convert notification response to the proper
520 * notification FOP
521 *
522 * @cmd: client notification start response command
523 *
524 * Return: MEI_FOP_NOTIFY_START or MEI_FOP_NOTIFY_STOP;
525 */
526static inline enum mei_cb_file_ops notify_res_to_fop(struct mei_hbm_cl_cmd *cmd)
527{
528 struct hbm_notification_response *rs =
529 (struct hbm_notification_response *)cmd;
530
531 return mei_cl_notify_req2fop(rs->start);
532}
533
534/**
535 * mei_hbm_cl_notify_start_res - update the client state according
536 * notify start response
537 *
538 * @dev: the device structure
539 * @cl: mei host client
540 * @cmd: client notification start response command
541 */
542static void mei_hbm_cl_notify_start_res(struct mei_device *dev,
543 struct mei_cl *cl,
544 struct mei_hbm_cl_cmd *cmd)
545{
546 struct hbm_notification_response *rs =
547 (struct hbm_notification_response *)cmd;
548
549 cl_dbg(dev, cl, "hbm: notify start response status=%d\n", rs->status);
550
551 if (rs->status == MEI_HBMS_SUCCESS ||
552 rs->status == MEI_HBMS_ALREADY_STARTED) {
553 cl->notify_en = true;
554 cl->status = 0;
555 } else {
556 cl->status = -EINVAL;
557 }
558}
559
560/**
561 * mei_hbm_cl_notify_stop_res - update the client state according
562 * notify stop response
563 *
564 * @dev: the device structure
565 * @cl: mei host client
566 * @cmd: client notification stop response command
567 */
568static void mei_hbm_cl_notify_stop_res(struct mei_device *dev,
569 struct mei_cl *cl,
570 struct mei_hbm_cl_cmd *cmd)
571{
572 struct hbm_notification_response *rs =
573 (struct hbm_notification_response *)cmd;
574
575 cl_dbg(dev, cl, "hbm: notify stop response status=%d\n", rs->status);
576
577 if (rs->status == MEI_HBMS_SUCCESS ||
578 rs->status == MEI_HBMS_NOT_STARTED) {
579 cl->notify_en = false;
580 cl->status = 0;
581 } else {
582 /* TODO: spec is not clear yet about other possible issues */
583 cl->status = -EINVAL;
584 }
585}
586
587/**
588 * mei_hbm_cl_notify - signal notification event
589 *
590 * @dev: the device structure
591 * @cmd: notification client message
592 */
593static void mei_hbm_cl_notify(struct mei_device *dev,
594 struct mei_hbm_cl_cmd *cmd)
595{
596 struct mei_cl *cl;
597
598 cl = mei_hbm_cl_find_by_cmd(dev, cmd);
599 if (cl)
600 mei_cl_notify(cl);
601}
602
603/**
604 * mei_hbm_cl_dma_map_req - send client dma map request
605 *
606 * @dev: the device structure
607 * @cl: mei host client
608 *
609 * Return: 0 on success and -EIO on write failure
610 */
611int mei_hbm_cl_dma_map_req(struct mei_device *dev, struct mei_cl *cl)
612{
613 struct mei_msg_hdr mei_hdr;
614 struct hbm_client_dma_map_request req;
615 int ret;
616
617 mei_hbm_hdr(&mei_hdr, sizeof(req));
618
619 memset(&req, 0, sizeof(req));
620
621 req.hbm_cmd = MEI_HBM_CLIENT_DMA_MAP_REQ_CMD;
622 req.client_buffer_id = cl->dma.buffer_id;
623 req.address_lsb = lower_32_bits(cl->dma.daddr);
624 req.address_msb = upper_32_bits(cl->dma.daddr);
625 req.size = cl->dma.size;
626
627 ret = mei_hbm_write_message(dev, &mei_hdr, &req);
628 if (ret)
629 dev_err(dev->dev, "dma map request failed: ret = %d\n", ret);
630
631 return ret;
632}
633
634/**
635 * mei_hbm_cl_dma_unmap_req - send client dma unmap request
636 *
637 * @dev: the device structure
638 * @cl: mei host client
639 *
640 * Return: 0 on success and -EIO on write failure
641 */
642int mei_hbm_cl_dma_unmap_req(struct mei_device *dev, struct mei_cl *cl)
643{
644 struct mei_msg_hdr mei_hdr;
645 struct hbm_client_dma_unmap_request req;
646 int ret;
647
648 mei_hbm_hdr(&mei_hdr, sizeof(req));
649
650 memset(&req, 0, sizeof(req));
651
652 req.hbm_cmd = MEI_HBM_CLIENT_DMA_UNMAP_REQ_CMD;
653 req.client_buffer_id = cl->dma.buffer_id;
654
655 ret = mei_hbm_write_message(dev, &mei_hdr, &req);
656 if (ret)
657 dev_err(dev->dev, "dma unmap request failed: ret = %d\n", ret);
658
659 return ret;
660}
661
662static void mei_hbm_cl_dma_map_res(struct mei_device *dev,
663 struct hbm_client_dma_response *res)
664{
665 struct mei_cl *cl;
666 struct mei_cl_cb *cb, *next;
667
668 cl = NULL;
669 list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
670 if (cb->fop_type != MEI_FOP_DMA_MAP)
671 continue;
672 if (!cb->cl->dma.buffer_id || cb->cl->dma_mapped)
673 continue;
674
675 cl = cb->cl;
676 break;
677 }
678 if (!cl)
679 return;
680
681 if (res->status) {
682 dev_err(dev->dev, "cl dma map failed %d\n", res->status);
683 cl->status = -EFAULT;
684 } else {
685 dev_dbg(dev->dev, "cl dma map succeeded\n");
686 cl->dma_mapped = 1;
687 cl->status = 0;
688 }
689 wake_up(&cl->wait);
690}
691
692static void mei_hbm_cl_dma_unmap_res(struct mei_device *dev,
693 struct hbm_client_dma_response *res)
694{
695 struct mei_cl *cl;
696 struct mei_cl_cb *cb, *next;
697
698 cl = NULL;
699 list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
700 if (cb->fop_type != MEI_FOP_DMA_UNMAP)
701 continue;
702 if (!cb->cl->dma.buffer_id || !cb->cl->dma_mapped)
703 continue;
704
705 cl = cb->cl;
706 break;
707 }
708 if (!cl)
709 return;
710
711 if (res->status) {
712 dev_err(dev->dev, "cl dma unmap failed %d\n", res->status);
713 cl->status = -EFAULT;
714 } else {
715 dev_dbg(dev->dev, "cl dma unmap succeeded\n");
716 cl->dma_mapped = 0;
717 cl->status = 0;
718 }
719 wake_up(&cl->wait);
720}
721
722/**
723 * mei_hbm_prop_req - request property for a single client
724 *
725 * @dev: the device structure
726 * @start_idx: client index to start search
727 *
728 * Return: 0 on success and < 0 on failure
729 */
730static int mei_hbm_prop_req(struct mei_device *dev, unsigned long start_idx)
731{
732 struct mei_msg_hdr mei_hdr;
733 struct hbm_props_request req;
734 unsigned long addr;
735 int ret;
736
737 addr = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX, start_idx);
738
739 /* We got all client properties */
740 if (addr == MEI_CLIENTS_MAX) {
741 dev->hbm_state = MEI_HBM_STARTED;
742 mei_host_client_init(dev);
743 return 0;
744 }
745
746 mei_hbm_hdr(&mei_hdr, sizeof(req));
747
748 memset(&req, 0, sizeof(req));
749
750 req.hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
751 req.me_addr = addr;
752
753 ret = mei_hbm_write_message(dev, &mei_hdr, &req);
754 if (ret) {
755 dev_err(dev->dev, "properties request write failed: ret = %d\n",
756 ret);
757 return ret;
758 }
759
760 dev->init_clients_timer = dev->timeouts.client_init;
761 mei_schedule_stall_timer(dev);
762
763 return 0;
764}
765
766/**
767 * mei_hbm_pg - sends pg command
768 *
769 * @dev: the device structure
770 * @pg_cmd: the pg command code
771 *
772 * Return: -EIO on write failure
773 * -EOPNOTSUPP if the operation is not supported by the protocol
774 */
775int mei_hbm_pg(struct mei_device *dev, u8 pg_cmd)
776{
777 struct mei_msg_hdr mei_hdr;
778 struct hbm_power_gate req;
779 int ret;
780
781 if (!dev->hbm_f_pg_supported)
782 return -EOPNOTSUPP;
783
784 mei_hbm_hdr(&mei_hdr, sizeof(req));
785
786 memset(&req, 0, sizeof(req));
787 req.hbm_cmd = pg_cmd;
788
789 ret = mei_hbm_write_message(dev, &mei_hdr, &req);
790 if (ret)
791 dev_err(dev->dev, "power gate command write failed.\n");
792 return ret;
793}
794EXPORT_SYMBOL_GPL(mei_hbm_pg);
795
796/**
797 * mei_hbm_stop_req - send stop request message
798 *
799 * @dev: mei device
800 *
801 * Return: -EIO on write failure
802 */
803static int mei_hbm_stop_req(struct mei_device *dev)
804{
805 struct mei_msg_hdr mei_hdr;
806 struct hbm_host_stop_request req;
807
808 mei_hbm_hdr(&mei_hdr, sizeof(req));
809
810 memset(&req, 0, sizeof(req));
811 req.hbm_cmd = HOST_STOP_REQ_CMD;
812 req.reason = DRIVER_STOP_REQUEST;
813
814 return mei_hbm_write_message(dev, &mei_hdr, &req);
815}
816
817/**
818 * mei_hbm_cl_flow_control_req - sends flow control request.
819 *
820 * @dev: the device structure
821 * @cl: client info
822 *
823 * Return: -EIO on write failure
824 */
825int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl)
826{
827 struct hbm_flow_control req;
828
829 cl_dbg(dev, cl, "sending flow control\n");
830 return mei_hbm_cl_write(dev, cl, MEI_FLOW_CONTROL_CMD,
831 &req, sizeof(req));
832}
833
834/**
835 * mei_hbm_add_single_tx_flow_ctrl_creds - adds single buffer credentials.
836 *
837 * @dev: the device structure
838 * @fctrl: flow control response bus message
839 *
840 * Return: 0 on success, < 0 otherwise
841 */
842static int mei_hbm_add_single_tx_flow_ctrl_creds(struct mei_device *dev,
843 struct hbm_flow_control *fctrl)
844{
845 struct mei_me_client *me_cl;
846 int rets;
847
848 me_cl = mei_me_cl_by_id(dev, fctrl->me_addr);
849 if (!me_cl) {
850 dev_err(dev->dev, "no such me client %d\n", fctrl->me_addr);
851 return -ENOENT;
852 }
853
854 if (WARN_ON(me_cl->props.single_recv_buf == 0)) {
855 rets = -EINVAL;
856 goto out;
857 }
858
859 me_cl->tx_flow_ctrl_creds++;
860 dev_dbg(dev->dev, "recv flow ctrl msg ME %d (single) creds = %d.\n",
861 fctrl->me_addr, me_cl->tx_flow_ctrl_creds);
862
863 rets = 0;
864out:
865 mei_me_cl_put(me_cl);
866 return rets;
867}
868
869/**
870 * mei_hbm_cl_tx_flow_ctrl_creds_res - flow control response from me
871 *
872 * @dev: the device structure
873 * @fctrl: flow control response bus message
874 */
875static void mei_hbm_cl_tx_flow_ctrl_creds_res(struct mei_device *dev,
876 struct hbm_flow_control *fctrl)
877{
878 struct mei_cl *cl;
879
880 if (!fctrl->host_addr) {
881 /* single receive buffer */
882 mei_hbm_add_single_tx_flow_ctrl_creds(dev, fctrl);
883 return;
884 }
885
886 cl = mei_hbm_cl_find_by_cmd(dev, fctrl);
887 if (cl) {
888 cl->tx_flow_ctrl_creds++;
889 cl_dbg(dev, cl, "flow control creds = %d.\n",
890 cl->tx_flow_ctrl_creds);
891 }
892}
893
894
895/**
896 * mei_hbm_cl_disconnect_req - sends disconnect message to fw.
897 *
898 * @dev: the device structure
899 * @cl: a client to disconnect from
900 *
901 * Return: -EIO on write failure
902 */
903int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
904{
905 struct hbm_client_connect_request req;
906
907 return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_REQ_CMD,
908 &req, sizeof(req));
909}
910
911/**
912 * mei_hbm_cl_disconnect_rsp - sends disconnect response to the FW
913 *
914 * @dev: the device structure
915 * @cl: a client to disconnect from
916 *
917 * Return: -EIO on write failure
918 */
919int mei_hbm_cl_disconnect_rsp(struct mei_device *dev, struct mei_cl *cl)
920{
921 struct hbm_client_connect_response resp;
922
923 return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_RES_CMD,
924 &resp, sizeof(resp));
925}
926
927/**
928 * mei_hbm_cl_disconnect_res - update the client state according
929 * disconnect response
930 *
931 * @dev: the device structure
932 * @cl: mei host client
933 * @cmd: disconnect client response host bus message
934 */
935static void mei_hbm_cl_disconnect_res(struct mei_device *dev, struct mei_cl *cl,
936 struct mei_hbm_cl_cmd *cmd)
937{
938 struct hbm_client_connect_response *rs =
939 (struct hbm_client_connect_response *)cmd;
940
941 cl_dbg(dev, cl, "hbm: disconnect response status=%d\n", rs->status);
942
943 if (rs->status == MEI_CL_DISCONN_SUCCESS)
944 cl->state = MEI_FILE_DISCONNECT_REPLY;
945 cl->status = 0;
946}
947
948/**
949 * mei_hbm_cl_connect_req - send connection request to specific me client
950 *
951 * @dev: the device structure
952 * @cl: a client to connect to
953 *
954 * Return: -EIO on write failure
955 */
956int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl)
957{
958 struct hbm_client_connect_request req;
959
960 return mei_hbm_cl_write(dev, cl, CLIENT_CONNECT_REQ_CMD,
961 &req, sizeof(req));
962}
963
964/**
965 * mei_hbm_cl_connect_res - update the client state according
966 * connection response
967 *
968 * @dev: the device structure
969 * @cl: mei host client
970 * @cmd: connect client response host bus message
971 */
972static void mei_hbm_cl_connect_res(struct mei_device *dev, struct mei_cl *cl,
973 struct mei_hbm_cl_cmd *cmd)
974{
975 struct hbm_client_connect_response *rs =
976 (struct hbm_client_connect_response *)cmd;
977
978 cl_dbg(dev, cl, "hbm: connect response status=%s\n",
979 mei_cl_conn_status_str(rs->status));
980
981 if (rs->status == MEI_CL_CONN_SUCCESS)
982 cl->state = MEI_FILE_CONNECTED;
983 else {
984 cl->state = MEI_FILE_DISCONNECT_REPLY;
985 if (rs->status == MEI_CL_CONN_NOT_FOUND) {
986 mei_me_cl_del(dev, cl->me_cl);
987 if (dev->dev_state == MEI_DEV_ENABLED)
988 schedule_work(&dev->bus_rescan_work);
989 }
990 }
991 cl->status = mei_cl_conn_status_to_errno(rs->status);
992}
993
994/**
995 * mei_hbm_cl_res - process hbm response received on behalf
996 * an client
997 *
998 * @dev: the device structure
999 * @rs: hbm client message
1000 * @fop_type: file operation type
1001 */
1002static void mei_hbm_cl_res(struct mei_device *dev,
1003 struct mei_hbm_cl_cmd *rs,
1004 enum mei_cb_file_ops fop_type)
1005{
1006 struct mei_cl *cl;
1007 struct mei_cl_cb *cb, *next;
1008
1009 cl = NULL;
1010 list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
1011
1012 cl = cb->cl;
1013
1014 if (cb->fop_type != fop_type)
1015 continue;
1016
1017 if (mei_hbm_cl_addr_equal(cl, rs)) {
1018 list_del_init(&cb->list);
1019 break;
1020 }
1021 }
1022
1023 if (!cl)
1024 return;
1025
1026 switch (fop_type) {
1027 case MEI_FOP_CONNECT:
1028 mei_hbm_cl_connect_res(dev, cl, rs);
1029 break;
1030 case MEI_FOP_DISCONNECT:
1031 mei_hbm_cl_disconnect_res(dev, cl, rs);
1032 break;
1033 case MEI_FOP_NOTIFY_START:
1034 mei_hbm_cl_notify_start_res(dev, cl, rs);
1035 break;
1036 case MEI_FOP_NOTIFY_STOP:
1037 mei_hbm_cl_notify_stop_res(dev, cl, rs);
1038 break;
1039 default:
1040 return;
1041 }
1042
1043 cl->timer_count = 0;
1044 wake_up(&cl->wait);
1045}
1046
1047
1048/**
1049 * mei_hbm_fw_disconnect_req - disconnect request initiated by ME firmware
1050 * host sends disconnect response
1051 *
1052 * @dev: the device structure.
1053 * @disconnect_req: disconnect request bus message from the me
1054 *
1055 * Return: -ENOMEM on allocation failure
1056 */
1057static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
1058 struct hbm_client_connect_request *disconnect_req)
1059{
1060 struct mei_cl *cl;
1061 struct mei_cl_cb *cb;
1062
1063 cl = mei_hbm_cl_find_by_cmd(dev, disconnect_req);
1064 if (cl) {
1065 cl_warn(dev, cl, "fw disconnect request received\n");
1066 cl->state = MEI_FILE_DISCONNECTING;
1067 cl->timer_count = 0;
1068
1069 cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_DISCONNECT_RSP,
1070 NULL);
1071 if (!cb)
1072 return -ENOMEM;
1073 }
1074 return 0;
1075}
1076
1077/**
1078 * mei_hbm_pg_enter_res - PG enter response received
1079 *
1080 * @dev: the device structure.
1081 *
1082 * Return: 0 on success, -EPROTO on state mismatch
1083 */
1084static int mei_hbm_pg_enter_res(struct mei_device *dev)
1085{
1086 if (mei_pg_state(dev) != MEI_PG_OFF ||
1087 dev->pg_event != MEI_PG_EVENT_WAIT) {
1088 dev_err(dev->dev, "hbm: pg entry response: state mismatch [%s, %d]\n",
1089 mei_pg_state_str(mei_pg_state(dev)), dev->pg_event);
1090 return -EPROTO;
1091 }
1092
1093 dev->pg_event = MEI_PG_EVENT_RECEIVED;
1094 wake_up(&dev->wait_pg);
1095
1096 return 0;
1097}
1098
1099/**
1100 * mei_hbm_pg_resume - process with PG resume
1101 *
1102 * @dev: the device structure.
1103 */
1104void mei_hbm_pg_resume(struct mei_device *dev)
1105{
1106 pm_request_resume(dev->dev);
1107}
1108EXPORT_SYMBOL_GPL(mei_hbm_pg_resume);
1109
1110/**
1111 * mei_hbm_pg_exit_res - PG exit response received
1112 *
1113 * @dev: the device structure.
1114 *
1115 * Return: 0 on success, -EPROTO on state mismatch
1116 */
1117static int mei_hbm_pg_exit_res(struct mei_device *dev)
1118{
1119 if (mei_pg_state(dev) != MEI_PG_ON ||
1120 (dev->pg_event != MEI_PG_EVENT_WAIT &&
1121 dev->pg_event != MEI_PG_EVENT_IDLE)) {
1122 dev_err(dev->dev, "hbm: pg exit response: state mismatch [%s, %d]\n",
1123 mei_pg_state_str(mei_pg_state(dev)), dev->pg_event);
1124 return -EPROTO;
1125 }
1126
1127 switch (dev->pg_event) {
1128 case MEI_PG_EVENT_WAIT:
1129 dev->pg_event = MEI_PG_EVENT_RECEIVED;
1130 wake_up(&dev->wait_pg);
1131 break;
1132 case MEI_PG_EVENT_IDLE:
1133 /*
1134 * If the driver is not waiting on this then
1135 * this is HW initiated exit from PG.
1136 * Start runtime pm resume sequence to exit from PG.
1137 */
1138 dev->pg_event = MEI_PG_EVENT_RECEIVED;
1139 mei_hbm_pg_resume(dev);
1140 break;
1141 default:
1142 WARN(1, "hbm: pg exit response: unexpected pg event = %d\n",
1143 dev->pg_event);
1144 return -EPROTO;
1145 }
1146
1147 return 0;
1148}
1149
1150/**
1151 * mei_hbm_config_features - check what hbm features and commands
1152 * are supported by the fw
1153 *
1154 * @dev: the device structure
1155 */
1156static void mei_hbm_config_features(struct mei_device *dev)
1157{
1158 /* Power Gating Isolation Support */
1159 dev->hbm_f_pg_supported = 0;
1160 if (dev->version.major_version > HBM_MAJOR_VERSION_PGI)
1161 dev->hbm_f_pg_supported = 1;
1162
1163 if (dev->version.major_version == HBM_MAJOR_VERSION_PGI &&
1164 dev->version.minor_version >= HBM_MINOR_VERSION_PGI)
1165 dev->hbm_f_pg_supported = 1;
1166
1167 dev->hbm_f_dc_supported = 0;
1168 if (dev->version.major_version >= HBM_MAJOR_VERSION_DC)
1169 dev->hbm_f_dc_supported = 1;
1170
1171 dev->hbm_f_ie_supported = 0;
1172 if (dev->version.major_version >= HBM_MAJOR_VERSION_IE)
1173 dev->hbm_f_ie_supported = 1;
1174
1175 /* disconnect on connect timeout instead of link reset */
1176 dev->hbm_f_dot_supported = 0;
1177 if (dev->version.major_version >= HBM_MAJOR_VERSION_DOT)
1178 dev->hbm_f_dot_supported = 1;
1179
1180 /* Notification Event Support */
1181 dev->hbm_f_ev_supported = 0;
1182 if (dev->version.major_version >= HBM_MAJOR_VERSION_EV)
1183 dev->hbm_f_ev_supported = 1;
1184
1185 /* Fixed Address Client Support */
1186 dev->hbm_f_fa_supported = 0;
1187 if (dev->version.major_version >= HBM_MAJOR_VERSION_FA)
1188 dev->hbm_f_fa_supported = 1;
1189
1190 /* OS ver message Support */
1191 dev->hbm_f_os_supported = 0;
1192 if (dev->version.major_version >= HBM_MAJOR_VERSION_OS)
1193 dev->hbm_f_os_supported = 1;
1194
1195 /* DMA Ring Support */
1196 dev->hbm_f_dr_supported = 0;
1197 if (dev->version.major_version > HBM_MAJOR_VERSION_DR ||
1198 (dev->version.major_version == HBM_MAJOR_VERSION_DR &&
1199 dev->version.minor_version >= HBM_MINOR_VERSION_DR))
1200 dev->hbm_f_dr_supported = 1;
1201
1202 /* VTag Support */
1203 dev->hbm_f_vt_supported = 0;
1204 if (dev->version.major_version > HBM_MAJOR_VERSION_VT ||
1205 (dev->version.major_version == HBM_MAJOR_VERSION_VT &&
1206 dev->version.minor_version >= HBM_MINOR_VERSION_VT))
1207 dev->hbm_f_vt_supported = 1;
1208
1209 /* GSC support */
1210 if (dev->version.major_version > HBM_MAJOR_VERSION_GSC ||
1211 (dev->version.major_version == HBM_MAJOR_VERSION_GSC &&
1212 dev->version.minor_version >= HBM_MINOR_VERSION_GSC))
1213 dev->hbm_f_gsc_supported = 1;
1214
1215 /* Capability message Support */
1216 dev->hbm_f_cap_supported = 0;
1217 if (dev->version.major_version > HBM_MAJOR_VERSION_CAP ||
1218 (dev->version.major_version == HBM_MAJOR_VERSION_CAP &&
1219 dev->version.minor_version >= HBM_MINOR_VERSION_CAP))
1220 dev->hbm_f_cap_supported = 1;
1221
1222 /* Client DMA Support */
1223 dev->hbm_f_cd_supported = 0;
1224 if (dev->version.major_version > HBM_MAJOR_VERSION_CD ||
1225 (dev->version.major_version == HBM_MAJOR_VERSION_CD &&
1226 dev->version.minor_version >= HBM_MINOR_VERSION_CD))
1227 dev->hbm_f_cd_supported = 1;
1228}
1229
1230/**
1231 * mei_hbm_version_is_supported - checks whether the driver can
1232 * support the hbm version of the device
1233 *
1234 * @dev: the device structure
1235 * Return: true if driver can support hbm version of the device
1236 */
1237bool mei_hbm_version_is_supported(struct mei_device *dev)
1238{
1239 return (dev->version.major_version < HBM_MAJOR_VERSION) ||
1240 (dev->version.major_version == HBM_MAJOR_VERSION &&
1241 dev->version.minor_version <= HBM_MINOR_VERSION);
1242}
1243
1244/**
1245 * mei_hbm_dispatch - bottom half read routine after ISR to
1246 * handle the read bus message cmd processing.
1247 *
1248 * @dev: the device structure
1249 * @hdr: header of bus message
1250 *
1251 * Return: 0 on success and < 0 on failure
1252 */
1253int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
1254{
1255 struct mei_bus_message *mei_msg;
1256 struct hbm_host_version_response *version_res;
1257 struct hbm_props_response *props_res;
1258 struct hbm_host_enum_response *enum_res;
1259 struct hbm_dma_setup_response *dma_setup_res;
1260 struct hbm_add_client_request *add_cl_req;
1261 struct hbm_capability_response *capability_res;
1262 int ret;
1263
1264 struct mei_hbm_cl_cmd *cl_cmd;
1265 struct hbm_client_connect_request *disconnect_req;
1266 struct hbm_flow_control *fctrl;
1267 struct hbm_client_dma_response *client_dma_res;
1268
1269 /* read the message to our buffer */
1270 BUG_ON(hdr->length >= sizeof(dev->rd_msg_buf));
1271 mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
1272 mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
1273 cl_cmd = (struct mei_hbm_cl_cmd *)mei_msg;
1274
1275 /* ignore spurious message and prevent reset nesting
1276 * hbm is put to idle during system reset
1277 */
1278 if (dev->hbm_state == MEI_HBM_IDLE) {
1279 dev_dbg(dev->dev, "hbm: state is idle ignore spurious messages\n");
1280 return 0;
1281 }
1282
1283 switch (mei_msg->hbm_cmd) {
1284 case HOST_START_RES_CMD:
1285 dev_dbg(dev->dev, "hbm: start: response message received.\n");
1286
1287 dev->init_clients_timer = 0;
1288
1289 version_res = (struct hbm_host_version_response *)mei_msg;
1290
1291 dev_dbg(dev->dev, "HBM VERSION: DRIVER=%02d:%02d DEVICE=%02d:%02d\n",
1292 HBM_MAJOR_VERSION, HBM_MINOR_VERSION,
1293 version_res->me_max_version.major_version,
1294 version_res->me_max_version.minor_version);
1295
1296 if (version_res->host_version_supported) {
1297 dev->version.major_version = HBM_MAJOR_VERSION;
1298 dev->version.minor_version = HBM_MINOR_VERSION;
1299 } else {
1300 dev->version.major_version =
1301 version_res->me_max_version.major_version;
1302 dev->version.minor_version =
1303 version_res->me_max_version.minor_version;
1304 }
1305
1306 if (!mei_hbm_version_is_supported(dev)) {
1307 dev_warn(dev->dev, "hbm: start: version mismatch - stopping the driver.\n");
1308
1309 dev->hbm_state = MEI_HBM_STOPPED;
1310 if (mei_hbm_stop_req(dev)) {
1311 dev_err(dev->dev, "hbm: start: failed to send stop request\n");
1312 return -EIO;
1313 }
1314 break;
1315 }
1316
1317 mei_hbm_config_features(dev);
1318
1319 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1320 dev->hbm_state != MEI_HBM_STARTING) {
1321 if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1322 dev->dev_state == MEI_DEV_POWERING_DOWN) {
1323 dev_dbg(dev->dev, "hbm: start: on shutdown, ignoring\n");
1324 return 0;
1325 }
1326 dev_err(dev->dev, "hbm: start: state mismatch, [%d, %d]\n",
1327 dev->dev_state, dev->hbm_state);
1328 return -EPROTO;
1329 }
1330
1331 if (dev->hbm_f_cap_supported) {
1332 if (mei_hbm_capabilities_req(dev))
1333 return -EIO;
1334 wake_up(&dev->wait_hbm_start);
1335 break;
1336 }
1337
1338 if (dev->hbm_f_dr_supported) {
1339 if (mei_dmam_ring_alloc(dev))
1340 dev_info(dev->dev, "running w/o dma ring\n");
1341 if (mei_dma_ring_is_allocated(dev)) {
1342 if (mei_hbm_dma_setup_req(dev))
1343 return -EIO;
1344
1345 wake_up(&dev->wait_hbm_start);
1346 break;
1347 }
1348 }
1349
1350 dev->hbm_f_dr_supported = 0;
1351 mei_dmam_ring_free(dev);
1352
1353 if (mei_hbm_enum_clients_req(dev))
1354 return -EIO;
1355
1356 wake_up(&dev->wait_hbm_start);
1357 break;
1358
1359 case MEI_HBM_CAPABILITIES_RES_CMD:
1360 dev_dbg(dev->dev, "hbm: capabilities response: message received.\n");
1361
1362 dev->init_clients_timer = 0;
1363
1364 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1365 dev->hbm_state != MEI_HBM_CAP_SETUP) {
1366 if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1367 dev->dev_state == MEI_DEV_POWERING_DOWN) {
1368 dev_dbg(dev->dev, "hbm: capabilities response: on shutdown, ignoring\n");
1369 return 0;
1370 }
1371 dev_err(dev->dev, "hbm: capabilities response: state mismatch, [%d, %d]\n",
1372 dev->dev_state, dev->hbm_state);
1373 return -EPROTO;
1374 }
1375
1376 capability_res = (struct hbm_capability_response *)mei_msg;
1377 if (!(capability_res->capability_granted[0] & HBM_CAP_VT))
1378 dev->hbm_f_vt_supported = 0;
1379 if (!(capability_res->capability_granted[0] & HBM_CAP_CD))
1380 dev->hbm_f_cd_supported = 0;
1381
1382 if (!(capability_res->capability_granted[0] & HBM_CAP_GSC))
1383 dev->hbm_f_gsc_supported = 0;
1384
1385 if (dev->hbm_f_dr_supported) {
1386 if (mei_dmam_ring_alloc(dev))
1387 dev_info(dev->dev, "running w/o dma ring\n");
1388 if (mei_dma_ring_is_allocated(dev)) {
1389 if (mei_hbm_dma_setup_req(dev))
1390 return -EIO;
1391 break;
1392 }
1393 }
1394
1395 dev->hbm_f_dr_supported = 0;
1396 mei_dmam_ring_free(dev);
1397
1398 if (mei_hbm_enum_clients_req(dev))
1399 return -EIO;
1400 break;
1401
1402 case MEI_HBM_DMA_SETUP_RES_CMD:
1403 dev_dbg(dev->dev, "hbm: dma setup response: message received.\n");
1404
1405 dev->init_clients_timer = 0;
1406
1407 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1408 dev->hbm_state != MEI_HBM_DR_SETUP) {
1409 if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1410 dev->dev_state == MEI_DEV_POWERING_DOWN) {
1411 dev_dbg(dev->dev, "hbm: dma setup response: on shutdown, ignoring\n");
1412 return 0;
1413 }
1414 dev_err(dev->dev, "hbm: dma setup response: state mismatch, [%d, %d]\n",
1415 dev->dev_state, dev->hbm_state);
1416 return -EPROTO;
1417 }
1418
1419 dma_setup_res = (struct hbm_dma_setup_response *)mei_msg;
1420
1421 if (dma_setup_res->status) {
1422 u8 status = dma_setup_res->status;
1423
1424 if (status == MEI_HBMS_NOT_ALLOWED) {
1425 dev_dbg(dev->dev, "hbm: dma setup not allowed\n");
1426 } else {
1427 dev_info(dev->dev, "hbm: dma setup response: failure = %d %s\n",
1428 status,
1429 mei_hbm_status_str(status));
1430 }
1431 dev->hbm_f_dr_supported = 0;
1432 mei_dmam_ring_free(dev);
1433 }
1434
1435 if (mei_hbm_enum_clients_req(dev))
1436 return -EIO;
1437 break;
1438
1439 case CLIENT_CONNECT_RES_CMD:
1440 dev_dbg(dev->dev, "hbm: client connect response: message received.\n");
1441 mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_CONNECT);
1442 break;
1443
1444 case CLIENT_DISCONNECT_RES_CMD:
1445 dev_dbg(dev->dev, "hbm: client disconnect response: message received.\n");
1446 mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_DISCONNECT);
1447 break;
1448
1449 case MEI_FLOW_CONTROL_CMD:
1450 dev_dbg(dev->dev, "hbm: client flow control response: message received.\n");
1451
1452 fctrl = (struct hbm_flow_control *)mei_msg;
1453 mei_hbm_cl_tx_flow_ctrl_creds_res(dev, fctrl);
1454 break;
1455
1456 case MEI_PG_ISOLATION_ENTRY_RES_CMD:
1457 dev_dbg(dev->dev, "hbm: power gate isolation entry response received\n");
1458 ret = mei_hbm_pg_enter_res(dev);
1459 if (ret)
1460 return ret;
1461 break;
1462
1463 case MEI_PG_ISOLATION_EXIT_REQ_CMD:
1464 dev_dbg(dev->dev, "hbm: power gate isolation exit request received\n");
1465 ret = mei_hbm_pg_exit_res(dev);
1466 if (ret)
1467 return ret;
1468 break;
1469
1470 case HOST_CLIENT_PROPERTIES_RES_CMD:
1471 dev_dbg(dev->dev, "hbm: properties response: message received.\n");
1472
1473 dev->init_clients_timer = 0;
1474
1475 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1476 dev->hbm_state != MEI_HBM_CLIENT_PROPERTIES) {
1477 if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1478 dev->dev_state == MEI_DEV_POWERING_DOWN) {
1479 dev_dbg(dev->dev, "hbm: properties response: on shutdown, ignoring\n");
1480 return 0;
1481 }
1482 dev_err(dev->dev, "hbm: properties response: state mismatch, [%d, %d]\n",
1483 dev->dev_state, dev->hbm_state);
1484 return -EPROTO;
1485 }
1486
1487 props_res = (struct hbm_props_response *)mei_msg;
1488
1489 if (props_res->status == MEI_HBMS_CLIENT_NOT_FOUND) {
1490 dev_dbg(dev->dev, "hbm: properties response: %d CLIENT_NOT_FOUND\n",
1491 props_res->me_addr);
1492 } else if (props_res->status) {
1493 dev_err(dev->dev, "hbm: properties response: wrong status = %d %s\n",
1494 props_res->status,
1495 mei_hbm_status_str(props_res->status));
1496 return -EPROTO;
1497 } else {
1498 mei_hbm_me_cl_add(dev, props_res);
1499 }
1500
1501 /* request property for the next client */
1502 if (mei_hbm_prop_req(dev, props_res->me_addr + 1))
1503 return -EIO;
1504
1505 break;
1506
1507 case HOST_ENUM_RES_CMD:
1508 dev_dbg(dev->dev, "hbm: enumeration response: message received\n");
1509
1510 dev->init_clients_timer = 0;
1511
1512 enum_res = (struct hbm_host_enum_response *) mei_msg;
1513 BUILD_BUG_ON(sizeof(dev->me_clients_map)
1514 < sizeof(enum_res->valid_addresses));
1515 memcpy(dev->me_clients_map, enum_res->valid_addresses,
1516 sizeof(enum_res->valid_addresses));
1517
1518 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1519 dev->hbm_state != MEI_HBM_ENUM_CLIENTS) {
1520 if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1521 dev->dev_state == MEI_DEV_POWERING_DOWN) {
1522 dev_dbg(dev->dev, "hbm: enumeration response: on shutdown, ignoring\n");
1523 return 0;
1524 }
1525 dev_err(dev->dev, "hbm: enumeration response: state mismatch, [%d, %d]\n",
1526 dev->dev_state, dev->hbm_state);
1527 return -EPROTO;
1528 }
1529
1530 dev->hbm_state = MEI_HBM_CLIENT_PROPERTIES;
1531
1532 /* first property request */
1533 if (mei_hbm_prop_req(dev, 0))
1534 return -EIO;
1535
1536 break;
1537
1538 case HOST_STOP_RES_CMD:
1539 dev_dbg(dev->dev, "hbm: stop response: message received\n");
1540
1541 dev->init_clients_timer = 0;
1542
1543 if (dev->hbm_state != MEI_HBM_STOPPED) {
1544 dev_err(dev->dev, "hbm: stop response: state mismatch, [%d, %d]\n",
1545 dev->dev_state, dev->hbm_state);
1546 return -EPROTO;
1547 }
1548
1549 mei_set_devstate(dev, MEI_DEV_POWER_DOWN);
1550 dev_info(dev->dev, "hbm: stop response: resetting.\n");
1551 /* force the reset */
1552 return -EPROTO;
1553
1554 case CLIENT_DISCONNECT_REQ_CMD:
1555 dev_dbg(dev->dev, "hbm: disconnect request: message received\n");
1556
1557 disconnect_req = (struct hbm_client_connect_request *)mei_msg;
1558 mei_hbm_fw_disconnect_req(dev, disconnect_req);
1559 break;
1560
1561 case ME_STOP_REQ_CMD:
1562 dev_dbg(dev->dev, "hbm: stop request: message received\n");
1563 dev->hbm_state = MEI_HBM_STOPPED;
1564 if (mei_hbm_stop_req(dev)) {
1565 dev_err(dev->dev, "hbm: stop request: failed to send stop request\n");
1566 return -EIO;
1567 }
1568 break;
1569
1570 case MEI_HBM_ADD_CLIENT_REQ_CMD:
1571 dev_dbg(dev->dev, "hbm: add client request received\n");
1572 /*
1573 * after the host receives the enum_resp
1574 * message clients may be added or removed
1575 */
1576 if (dev->hbm_state <= MEI_HBM_ENUM_CLIENTS ||
1577 dev->hbm_state >= MEI_HBM_STOPPED) {
1578 dev_err(dev->dev, "hbm: add client: state mismatch, [%d, %d]\n",
1579 dev->dev_state, dev->hbm_state);
1580 return -EPROTO;
1581 }
1582 add_cl_req = (struct hbm_add_client_request *)mei_msg;
1583 ret = mei_hbm_fw_add_cl_req(dev, add_cl_req);
1584 if (ret) {
1585 dev_err(dev->dev, "hbm: add client: failed to send response %d\n",
1586 ret);
1587 return -EIO;
1588 }
1589 dev_dbg(dev->dev, "hbm: add client request processed\n");
1590 break;
1591
1592 case MEI_HBM_NOTIFY_RES_CMD:
1593 dev_dbg(dev->dev, "hbm: notify response received\n");
1594 mei_hbm_cl_res(dev, cl_cmd, notify_res_to_fop(cl_cmd));
1595 break;
1596
1597 case MEI_HBM_NOTIFICATION_CMD:
1598 dev_dbg(dev->dev, "hbm: notification\n");
1599 mei_hbm_cl_notify(dev, cl_cmd);
1600 break;
1601
1602 case MEI_HBM_CLIENT_DMA_MAP_RES_CMD:
1603 dev_dbg(dev->dev, "hbm: client dma map response: message received.\n");
1604 client_dma_res = (struct hbm_client_dma_response *)mei_msg;
1605 mei_hbm_cl_dma_map_res(dev, client_dma_res);
1606 break;
1607
1608 case MEI_HBM_CLIENT_DMA_UNMAP_RES_CMD:
1609 dev_dbg(dev->dev, "hbm: client dma unmap response: message received.\n");
1610 client_dma_res = (struct hbm_client_dma_response *)mei_msg;
1611 mei_hbm_cl_dma_unmap_res(dev, client_dma_res);
1612 break;
1613
1614 default:
1615 WARN(1, "hbm: wrong command %d\n", mei_msg->hbm_cmd);
1616 return -EPROTO;
1617
1618 }
1619 return 0;
1620}
1621