mei: dma: silent the reject message
[muen/linux.git] / drivers / misc / mei / hbm.c
1 /*
2  *
3  * Intel Management Engine Interface (Intel MEI) Linux driver
4  * Copyright (c) 2003-2012, Intel Corporation.
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms and conditions of the GNU General Public License,
8  * version 2, as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13  * more details.
14  *
15  */
16
17 #include <linux/export.h>
18 #include <linux/sched.h>
19 #include <linux/wait.h>
20 #include <linux/pm_runtime.h>
21 #include <linux/slab.h>
22
23 #include <linux/mei.h>
24
25 #include "mei_dev.h"
26 #include "hbm.h"
27 #include "client.h"
28
29 static const char *mei_hbm_status_str(enum mei_hbm_status status)
30 {
31 #define MEI_HBM_STATUS(status) case MEI_HBMS_##status: return #status
32         switch (status) {
33         MEI_HBM_STATUS(SUCCESS);
34         MEI_HBM_STATUS(CLIENT_NOT_FOUND);
35         MEI_HBM_STATUS(ALREADY_EXISTS);
36         MEI_HBM_STATUS(REJECTED);
37         MEI_HBM_STATUS(INVALID_PARAMETER);
38         MEI_HBM_STATUS(NOT_ALLOWED);
39         MEI_HBM_STATUS(ALREADY_STARTED);
40         MEI_HBM_STATUS(NOT_STARTED);
41         default: return "unknown";
42         }
43 #undef MEI_HBM_STATUS
44 };
45
46 static const char *mei_cl_conn_status_str(enum mei_cl_connect_status status)
47 {
48 #define MEI_CL_CS(status) case MEI_CL_CONN_##status: return #status
49         switch (status) {
50         MEI_CL_CS(SUCCESS);
51         MEI_CL_CS(NOT_FOUND);
52         MEI_CL_CS(ALREADY_STARTED);
53         MEI_CL_CS(OUT_OF_RESOURCES);
54         MEI_CL_CS(MESSAGE_SMALL);
55         MEI_CL_CS(NOT_ALLOWED);
56         default: return "unknown";
57         }
58 #undef MEI_CL_CCS
59 }
60
61 const char *mei_hbm_state_str(enum mei_hbm_state state)
62 {
63 #define MEI_HBM_STATE(state) case MEI_HBM_##state: return #state
64         switch (state) {
65         MEI_HBM_STATE(IDLE);
66         MEI_HBM_STATE(STARTING);
67         MEI_HBM_STATE(STARTED);
68         MEI_HBM_STATE(DR_SETUP);
69         MEI_HBM_STATE(ENUM_CLIENTS);
70         MEI_HBM_STATE(CLIENT_PROPERTIES);
71         MEI_HBM_STATE(STOPPED);
72         default:
73                 return "unknown";
74         }
75 #undef MEI_HBM_STATE
76 }
77
78 /**
79  * mei_cl_conn_status_to_errno - convert client connect response
80  * status to error code
81  *
82  * @status: client connect response status
83  *
84  * Return: corresponding error code
85  */
86 static int mei_cl_conn_status_to_errno(enum mei_cl_connect_status status)
87 {
88         switch (status) {
89         case MEI_CL_CONN_SUCCESS:          return 0;
90         case MEI_CL_CONN_NOT_FOUND:        return -ENOTTY;
91         case MEI_CL_CONN_ALREADY_STARTED:  return -EBUSY;
92         case MEI_CL_CONN_OUT_OF_RESOURCES: return -EBUSY;
93         case MEI_CL_CONN_MESSAGE_SMALL:    return -EINVAL;
94         case MEI_CL_CONN_NOT_ALLOWED:      return -EBUSY;
95         default:                           return -EINVAL;
96         }
97 }
98
99 /**
100  * mei_hbm_write_message - wrapper for sending hbm messages.
101  *
102  * @dev: mei device
103  * @hdr: mei header
104  * @data: payload
105  */
106 static inline int mei_hbm_write_message(struct mei_device *dev,
107                                         struct mei_msg_hdr *hdr,
108                                         const void *data)
109 {
110         return mei_write_message(dev, hdr, sizeof(*hdr), data, hdr->length);
111 }
112
113 /**
114  * mei_hbm_idle - set hbm to idle state
115  *
116  * @dev: the device structure
117  */
118 void mei_hbm_idle(struct mei_device *dev)
119 {
120         dev->init_clients_timer = 0;
121         dev->hbm_state = MEI_HBM_IDLE;
122 }
123
124 /**
125  * mei_hbm_reset - reset hbm counters and book keeping data structurs
126  *
127  * @dev: the device structure
128  */
129 void mei_hbm_reset(struct mei_device *dev)
130 {
131         mei_me_cl_rm_all(dev);
132
133         mei_hbm_idle(dev);
134 }
135
136 /**
137  * mei_hbm_hdr - construct hbm header
138  *
139  * @hdr: hbm header
140  * @length: payload length
141  */
142
143 static inline void mei_hbm_hdr(struct mei_msg_hdr *hdr, size_t length)
144 {
145         hdr->host_addr = 0;
146         hdr->me_addr = 0;
147         hdr->length = length;
148         hdr->msg_complete = 1;
149         hdr->dma_ring = 0;
150         hdr->reserved = 0;
151         hdr->internal = 0;
152 }
153
154 /**
155  * mei_hbm_cl_hdr - construct client hbm header
156  *
157  * @cl: client
158  * @hbm_cmd: host bus message command
159  * @buf: buffer for cl header
160  * @len: buffer length
161  */
162 static inline
163 void mei_hbm_cl_hdr(struct mei_cl *cl, u8 hbm_cmd, void *buf, size_t len)
164 {
165         struct mei_hbm_cl_cmd *cmd = buf;
166
167         memset(cmd, 0, len);
168
169         cmd->hbm_cmd = hbm_cmd;
170         cmd->host_addr = mei_cl_host_addr(cl);
171         cmd->me_addr = mei_cl_me_id(cl);
172 }
173
174 /**
175  * mei_hbm_cl_write - write simple hbm client message
176  *
177  * @dev: the device structure
178  * @cl: client
179  * @hbm_cmd: host bus message command
180  * @buf: message buffer
181  * @len: buffer length
182  *
183  * Return: 0 on success, <0 on failure.
184  */
185 static inline int mei_hbm_cl_write(struct mei_device *dev, struct mei_cl *cl,
186                                    u8 hbm_cmd, void *buf, size_t len)
187 {
188         struct mei_msg_hdr mei_hdr;
189
190         mei_hbm_hdr(&mei_hdr, len);
191         mei_hbm_cl_hdr(cl, hbm_cmd, buf, len);
192
193         return mei_hbm_write_message(dev, &mei_hdr, buf);
194 }
195
196 /**
197  * mei_hbm_cl_addr_equal - check if the client's and
198  *      the message address match
199  *
200  * @cl: client
201  * @cmd: hbm client message
202  *
203  * Return: true if addresses are the same
204  */
205 static inline
206 bool mei_hbm_cl_addr_equal(struct mei_cl *cl, struct mei_hbm_cl_cmd *cmd)
207 {
208         return  mei_cl_host_addr(cl) == cmd->host_addr &&
209                 mei_cl_me_id(cl) == cmd->me_addr;
210 }
211
212 /**
213  * mei_hbm_cl_find_by_cmd - find recipient client
214  *
215  * @dev: the device structure
216  * @buf: a buffer with hbm cl command
217  *
218  * Return: the recipient client or NULL if not found
219  */
220 static inline
221 struct mei_cl *mei_hbm_cl_find_by_cmd(struct mei_device *dev, void *buf)
222 {
223         struct mei_hbm_cl_cmd *cmd = (struct mei_hbm_cl_cmd *)buf;
224         struct mei_cl *cl;
225
226         list_for_each_entry(cl, &dev->file_list, link)
227                 if (mei_hbm_cl_addr_equal(cl, cmd))
228                         return cl;
229         return NULL;
230 }
231
232
233 /**
234  * mei_hbm_start_wait - wait for start response message.
235  *
236  * @dev: the device structure
237  *
238  * Return: 0 on success and < 0 on failure
239  */
240 int mei_hbm_start_wait(struct mei_device *dev)
241 {
242         int ret;
243
244         if (dev->hbm_state > MEI_HBM_STARTING)
245                 return 0;
246
247         mutex_unlock(&dev->device_lock);
248         ret = wait_event_timeout(dev->wait_hbm_start,
249                         dev->hbm_state != MEI_HBM_STARTING,
250                         mei_secs_to_jiffies(MEI_HBM_TIMEOUT));
251         mutex_lock(&dev->device_lock);
252
253         if (ret == 0 && (dev->hbm_state <= MEI_HBM_STARTING)) {
254                 dev->hbm_state = MEI_HBM_IDLE;
255                 dev_err(dev->dev, "waiting for mei start failed\n");
256                 return -ETIME;
257         }
258         return 0;
259 }
260
261 /**
262  * mei_hbm_start_req - sends start request message.
263  *
264  * @dev: the device structure
265  *
266  * Return: 0 on success and < 0 on failure
267  */
268 int mei_hbm_start_req(struct mei_device *dev)
269 {
270         struct mei_msg_hdr mei_hdr;
271         struct hbm_host_version_request start_req;
272         const size_t len = sizeof(struct hbm_host_version_request);
273         int ret;
274
275         mei_hbm_reset(dev);
276
277         mei_hbm_hdr(&mei_hdr, len);
278
279         /* host start message */
280         memset(&start_req, 0, len);
281         start_req.hbm_cmd = HOST_START_REQ_CMD;
282         start_req.host_version.major_version = HBM_MAJOR_VERSION;
283         start_req.host_version.minor_version = HBM_MINOR_VERSION;
284
285         dev->hbm_state = MEI_HBM_IDLE;
286         ret = mei_hbm_write_message(dev, &mei_hdr, &start_req);
287         if (ret) {
288                 dev_err(dev->dev, "version message write failed: ret = %d\n",
289                         ret);
290                 return ret;
291         }
292
293         dev->hbm_state = MEI_HBM_STARTING;
294         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
295         mei_schedule_stall_timer(dev);
296         return 0;
297 }
298
299 /**
300  * mei_hbm_dma_setup_req() - setup DMA request
301  * @dev: the device structure
302  *
303  * Return: 0 on success and < 0 on failure
304  */
305 static int mei_hbm_dma_setup_req(struct mei_device *dev)
306 {
307         struct mei_msg_hdr mei_hdr;
308         struct hbm_dma_setup_request req;
309         const size_t len = sizeof(struct hbm_dma_setup_request);
310         unsigned int i;
311         int ret;
312
313         mei_hbm_hdr(&mei_hdr, len);
314
315         memset(&req, 0, len);
316         req.hbm_cmd = MEI_HBM_DMA_SETUP_REQ_CMD;
317         for (i = 0; i < DMA_DSCR_NUM; i++) {
318                 phys_addr_t paddr;
319
320                 paddr = dev->dr_dscr[i].daddr;
321                 req.dma_dscr[i].addr_hi = upper_32_bits(paddr);
322                 req.dma_dscr[i].addr_lo = lower_32_bits(paddr);
323                 req.dma_dscr[i].size = dev->dr_dscr[i].size;
324         }
325
326         mei_dma_ring_reset(dev);
327
328         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
329         if (ret) {
330                 dev_err(dev->dev, "dma setup request write failed: ret = %d.\n",
331                         ret);
332                 return ret;
333         }
334
335         dev->hbm_state = MEI_HBM_DR_SETUP;
336         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
337         mei_schedule_stall_timer(dev);
338         return 0;
339 }
340
341 /**
342  * mei_hbm_enum_clients_req - sends enumeration client request message.
343  *
344  * @dev: the device structure
345  *
346  * Return: 0 on success and < 0 on failure
347  */
348 static int mei_hbm_enum_clients_req(struct mei_device *dev)
349 {
350         struct mei_msg_hdr mei_hdr;
351         struct hbm_host_enum_request enum_req;
352         const size_t len = sizeof(struct hbm_host_enum_request);
353         int ret;
354
355         /* enumerate clients */
356         mei_hbm_hdr(&mei_hdr, len);
357
358         memset(&enum_req, 0, len);
359         enum_req.hbm_cmd = HOST_ENUM_REQ_CMD;
360         enum_req.flags |= dev->hbm_f_dc_supported ?
361                           MEI_HBM_ENUM_F_ALLOW_ADD : 0;
362         enum_req.flags |= dev->hbm_f_ie_supported ?
363                           MEI_HBM_ENUM_F_IMMEDIATE_ENUM : 0;
364
365         ret = mei_hbm_write_message(dev, &mei_hdr, &enum_req);
366         if (ret) {
367                 dev_err(dev->dev, "enumeration request write failed: ret = %d.\n",
368                         ret);
369                 return ret;
370         }
371         dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
372         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
373         mei_schedule_stall_timer(dev);
374         return 0;
375 }
376
377 /**
378  * mei_hbm_me_cl_add - add new me client to the list
379  *
380  * @dev: the device structure
381  * @res: hbm property response
382  *
383  * Return: 0 on success and -ENOMEM on allocation failure
384  */
385
386 static int mei_hbm_me_cl_add(struct mei_device *dev,
387                              struct hbm_props_response *res)
388 {
389         struct mei_me_client *me_cl;
390         const uuid_le *uuid = &res->client_properties.protocol_name;
391
392         mei_me_cl_rm_by_uuid(dev, uuid);
393
394         me_cl = kzalloc(sizeof(struct mei_me_client), GFP_KERNEL);
395         if (!me_cl)
396                 return -ENOMEM;
397
398         mei_me_cl_init(me_cl);
399
400         me_cl->props = res->client_properties;
401         me_cl->client_id = res->me_addr;
402         me_cl->tx_flow_ctrl_creds = 0;
403
404         mei_me_cl_add(dev, me_cl);
405
406         return 0;
407 }
408
409 /**
410  * mei_hbm_add_cl_resp - send response to fw on client add request
411  *
412  * @dev: the device structure
413  * @addr: me address
414  * @status: response status
415  *
416  * Return: 0 on success and < 0 on failure
417  */
418 static int mei_hbm_add_cl_resp(struct mei_device *dev, u8 addr, u8 status)
419 {
420         struct mei_msg_hdr mei_hdr;
421         struct hbm_add_client_response resp;
422         const size_t len = sizeof(struct hbm_add_client_response);
423         int ret;
424
425         dev_dbg(dev->dev, "adding client response\n");
426
427         mei_hbm_hdr(&mei_hdr, len);
428
429         memset(&resp, 0, sizeof(struct hbm_add_client_response));
430         resp.hbm_cmd = MEI_HBM_ADD_CLIENT_RES_CMD;
431         resp.me_addr = addr;
432         resp.status  = status;
433
434         ret = mei_hbm_write_message(dev, &mei_hdr, &resp);
435         if (ret)
436                 dev_err(dev->dev, "add client response write failed: ret = %d\n",
437                         ret);
438         return ret;
439 }
440
441 /**
442  * mei_hbm_fw_add_cl_req - request from the fw to add a client
443  *
444  * @dev: the device structure
445  * @req: add client request
446  *
447  * Return: 0 on success and < 0 on failure
448  */
449 static int mei_hbm_fw_add_cl_req(struct mei_device *dev,
450                               struct hbm_add_client_request *req)
451 {
452         int ret;
453         u8 status = MEI_HBMS_SUCCESS;
454
455         BUILD_BUG_ON(sizeof(struct hbm_add_client_request) !=
456                         sizeof(struct hbm_props_response));
457
458         ret = mei_hbm_me_cl_add(dev, (struct hbm_props_response *)req);
459         if (ret)
460                 status = !MEI_HBMS_SUCCESS;
461
462         if (dev->dev_state == MEI_DEV_ENABLED)
463                 schedule_work(&dev->bus_rescan_work);
464
465         return mei_hbm_add_cl_resp(dev, req->me_addr, status);
466 }
467
468 /**
469  * mei_hbm_cl_notify_req - send notification request
470  *
471  * @dev: the device structure
472  * @cl: a client to disconnect from
473  * @start: true for start false for stop
474  *
475  * Return: 0 on success and -EIO on write failure
476  */
477 int mei_hbm_cl_notify_req(struct mei_device *dev,
478                           struct mei_cl *cl, u8 start)
479 {
480
481         struct mei_msg_hdr mei_hdr;
482         struct hbm_notification_request req;
483         const size_t len = sizeof(struct hbm_notification_request);
484         int ret;
485
486         mei_hbm_hdr(&mei_hdr, len);
487         mei_hbm_cl_hdr(cl, MEI_HBM_NOTIFY_REQ_CMD, &req, len);
488
489         req.start = start;
490
491         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
492         if (ret)
493                 dev_err(dev->dev, "notify request failed: ret = %d\n", ret);
494
495         return ret;
496 }
497
498 /**
499  *  notify_res_to_fop - convert notification response to the proper
500  *      notification FOP
501  *
502  * @cmd: client notification start response command
503  *
504  * Return:  MEI_FOP_NOTIFY_START or MEI_FOP_NOTIFY_STOP;
505  */
506 static inline enum mei_cb_file_ops notify_res_to_fop(struct mei_hbm_cl_cmd *cmd)
507 {
508         struct hbm_notification_response *rs =
509                 (struct hbm_notification_response *)cmd;
510
511         return mei_cl_notify_req2fop(rs->start);
512 }
513
514 /**
515  * mei_hbm_cl_notify_start_res - update the client state according
516  *       notify start response
517  *
518  * @dev: the device structure
519  * @cl: mei host client
520  * @cmd: client notification start response command
521  */
522 static void mei_hbm_cl_notify_start_res(struct mei_device *dev,
523                                         struct mei_cl *cl,
524                                         struct mei_hbm_cl_cmd *cmd)
525 {
526         struct hbm_notification_response *rs =
527                 (struct hbm_notification_response *)cmd;
528
529         cl_dbg(dev, cl, "hbm: notify start response status=%d\n", rs->status);
530
531         if (rs->status == MEI_HBMS_SUCCESS ||
532             rs->status == MEI_HBMS_ALREADY_STARTED) {
533                 cl->notify_en = true;
534                 cl->status = 0;
535         } else {
536                 cl->status = -EINVAL;
537         }
538 }
539
540 /**
541  * mei_hbm_cl_notify_stop_res - update the client state according
542  *       notify stop response
543  *
544  * @dev: the device structure
545  * @cl: mei host client
546  * @cmd: client notification stop response command
547  */
548 static void mei_hbm_cl_notify_stop_res(struct mei_device *dev,
549                                        struct mei_cl *cl,
550                                        struct mei_hbm_cl_cmd *cmd)
551 {
552         struct hbm_notification_response *rs =
553                 (struct hbm_notification_response *)cmd;
554
555         cl_dbg(dev, cl, "hbm: notify stop response status=%d\n", rs->status);
556
557         if (rs->status == MEI_HBMS_SUCCESS ||
558             rs->status == MEI_HBMS_NOT_STARTED) {
559                 cl->notify_en = false;
560                 cl->status = 0;
561         } else {
562                 /* TODO: spec is not clear yet about other possible issues */
563                 cl->status = -EINVAL;
564         }
565 }
566
567 /**
568  * mei_hbm_cl_notify - signal notification event
569  *
570  * @dev: the device structure
571  * @cmd: notification client message
572  */
573 static void mei_hbm_cl_notify(struct mei_device *dev,
574                               struct mei_hbm_cl_cmd *cmd)
575 {
576         struct mei_cl *cl;
577
578         cl = mei_hbm_cl_find_by_cmd(dev, cmd);
579         if (cl)
580                 mei_cl_notify(cl);
581 }
582
583 /**
584  * mei_hbm_prop_req - request property for a single client
585  *
586  * @dev: the device structure
587  * @start_idx: client index to start search
588  *
589  * Return: 0 on success and < 0 on failure
590  */
591 static int mei_hbm_prop_req(struct mei_device *dev, unsigned long start_idx)
592 {
593         struct mei_msg_hdr mei_hdr;
594         struct hbm_props_request prop_req;
595         const size_t len = sizeof(struct hbm_props_request);
596         unsigned long addr;
597         int ret;
598
599         addr = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX, start_idx);
600
601         /* We got all client properties */
602         if (addr == MEI_CLIENTS_MAX) {
603                 dev->hbm_state = MEI_HBM_STARTED;
604                 mei_host_client_init(dev);
605
606                 return 0;
607         }
608
609         mei_hbm_hdr(&mei_hdr, len);
610
611         memset(&prop_req, 0, sizeof(struct hbm_props_request));
612
613         prop_req.hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
614         prop_req.me_addr = addr;
615
616         ret = mei_hbm_write_message(dev, &mei_hdr, &prop_req);
617         if (ret) {
618                 dev_err(dev->dev, "properties request write failed: ret = %d\n",
619                         ret);
620                 return ret;
621         }
622
623         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
624         mei_schedule_stall_timer(dev);
625
626         return 0;
627 }
628
629 /**
630  * mei_hbm_pg - sends pg command
631  *
632  * @dev: the device structure
633  * @pg_cmd: the pg command code
634  *
635  * Return: -EIO on write failure
636  *         -EOPNOTSUPP if the operation is not supported by the protocol
637  */
638 int mei_hbm_pg(struct mei_device *dev, u8 pg_cmd)
639 {
640         struct mei_msg_hdr mei_hdr;
641         struct hbm_power_gate req;
642         const size_t len = sizeof(struct hbm_power_gate);
643         int ret;
644
645         if (!dev->hbm_f_pg_supported)
646                 return -EOPNOTSUPP;
647
648         mei_hbm_hdr(&mei_hdr, len);
649
650         memset(&req, 0, len);
651         req.hbm_cmd = pg_cmd;
652
653         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
654         if (ret)
655                 dev_err(dev->dev, "power gate command write failed.\n");
656         return ret;
657 }
658 EXPORT_SYMBOL_GPL(mei_hbm_pg);
659
660 /**
661  * mei_hbm_stop_req - send stop request message
662  *
663  * @dev: mei device
664  *
665  * Return: -EIO on write failure
666  */
667 static int mei_hbm_stop_req(struct mei_device *dev)
668 {
669         struct mei_msg_hdr mei_hdr;
670         struct hbm_host_stop_request req;
671         const size_t len = sizeof(struct hbm_host_stop_request);
672
673         mei_hbm_hdr(&mei_hdr, len);
674
675         memset(&req, 0, len);
676         req.hbm_cmd = HOST_STOP_REQ_CMD;
677         req.reason = DRIVER_STOP_REQUEST;
678
679         return mei_hbm_write_message(dev, &mei_hdr, &req);
680 }
681
682 /**
683  * mei_hbm_cl_flow_control_req - sends flow control request.
684  *
685  * @dev: the device structure
686  * @cl: client info
687  *
688  * Return: -EIO on write failure
689  */
690 int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl)
691 {
692         struct hbm_flow_control req;
693
694         cl_dbg(dev, cl, "sending flow control\n");
695         return mei_hbm_cl_write(dev, cl, MEI_FLOW_CONTROL_CMD,
696                                 &req, sizeof(req));
697 }
698
699 /**
700  * mei_hbm_add_single_tx_flow_ctrl_creds - adds single buffer credentials.
701  *
702  * @dev: the device structure
703  * @fctrl: flow control response bus message
704  *
705  * Return: 0 on success, < 0 otherwise
706  */
707 static int mei_hbm_add_single_tx_flow_ctrl_creds(struct mei_device *dev,
708                                                  struct hbm_flow_control *fctrl)
709 {
710         struct mei_me_client *me_cl;
711         int rets;
712
713         me_cl = mei_me_cl_by_id(dev, fctrl->me_addr);
714         if (!me_cl) {
715                 dev_err(dev->dev, "no such me client %d\n", fctrl->me_addr);
716                 return -ENOENT;
717         }
718
719         if (WARN_ON(me_cl->props.single_recv_buf == 0)) {
720                 rets = -EINVAL;
721                 goto out;
722         }
723
724         me_cl->tx_flow_ctrl_creds++;
725         dev_dbg(dev->dev, "recv flow ctrl msg ME %d (single) creds = %d.\n",
726                 fctrl->me_addr, me_cl->tx_flow_ctrl_creds);
727
728         rets = 0;
729 out:
730         mei_me_cl_put(me_cl);
731         return rets;
732 }
733
734 /**
735  * mei_hbm_cl_flow_control_res - flow control response from me
736  *
737  * @dev: the device structure
738  * @fctrl: flow control response bus message
739  */
740 static void mei_hbm_cl_tx_flow_ctrl_creds_res(struct mei_device *dev,
741                                                struct hbm_flow_control *fctrl)
742 {
743         struct mei_cl *cl;
744
745         if (!fctrl->host_addr) {
746                 /* single receive buffer */
747                 mei_hbm_add_single_tx_flow_ctrl_creds(dev, fctrl);
748                 return;
749         }
750
751         cl = mei_hbm_cl_find_by_cmd(dev, fctrl);
752         if (cl) {
753                 cl->tx_flow_ctrl_creds++;
754                 cl_dbg(dev, cl, "flow control creds = %d.\n",
755                                 cl->tx_flow_ctrl_creds);
756         }
757 }
758
759
760 /**
761  * mei_hbm_cl_disconnect_req - sends disconnect message to fw.
762  *
763  * @dev: the device structure
764  * @cl: a client to disconnect from
765  *
766  * Return: -EIO on write failure
767  */
768 int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
769 {
770         struct hbm_client_connect_request req;
771
772         return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_REQ_CMD,
773                                 &req, sizeof(req));
774 }
775
776 /**
777  * mei_hbm_cl_disconnect_rsp - sends disconnect respose to the FW
778  *
779  * @dev: the device structure
780  * @cl: a client to disconnect from
781  *
782  * Return: -EIO on write failure
783  */
784 int mei_hbm_cl_disconnect_rsp(struct mei_device *dev, struct mei_cl *cl)
785 {
786         struct hbm_client_connect_response resp;
787
788         return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_RES_CMD,
789                                 &resp, sizeof(resp));
790 }
791
792 /**
793  * mei_hbm_cl_disconnect_res - update the client state according
794  *       disconnect response
795  *
796  * @dev: the device structure
797  * @cl: mei host client
798  * @cmd: disconnect client response host bus message
799  */
800 static void mei_hbm_cl_disconnect_res(struct mei_device *dev, struct mei_cl *cl,
801                                       struct mei_hbm_cl_cmd *cmd)
802 {
803         struct hbm_client_connect_response *rs =
804                 (struct hbm_client_connect_response *)cmd;
805
806         cl_dbg(dev, cl, "hbm: disconnect response status=%d\n", rs->status);
807
808         if (rs->status == MEI_CL_DISCONN_SUCCESS)
809                 cl->state = MEI_FILE_DISCONNECT_REPLY;
810         cl->status = 0;
811 }
812
813 /**
814  * mei_hbm_cl_connect_req - send connection request to specific me client
815  *
816  * @dev: the device structure
817  * @cl: a client to connect to
818  *
819  * Return: -EIO on write failure
820  */
821 int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl)
822 {
823         struct hbm_client_connect_request req;
824
825         return mei_hbm_cl_write(dev, cl, CLIENT_CONNECT_REQ_CMD,
826                                 &req, sizeof(req));
827 }
828
829 /**
830  * mei_hbm_cl_connect_res - update the client state according
831  *        connection response
832  *
833  * @dev: the device structure
834  * @cl: mei host client
835  * @cmd: connect client response host bus message
836  */
837 static void mei_hbm_cl_connect_res(struct mei_device *dev, struct mei_cl *cl,
838                                    struct mei_hbm_cl_cmd *cmd)
839 {
840         struct hbm_client_connect_response *rs =
841                 (struct hbm_client_connect_response *)cmd;
842
843         cl_dbg(dev, cl, "hbm: connect response status=%s\n",
844                         mei_cl_conn_status_str(rs->status));
845
846         if (rs->status == MEI_CL_CONN_SUCCESS)
847                 cl->state = MEI_FILE_CONNECTED;
848         else {
849                 cl->state = MEI_FILE_DISCONNECT_REPLY;
850                 if (rs->status == MEI_CL_CONN_NOT_FOUND) {
851                         mei_me_cl_del(dev, cl->me_cl);
852                         if (dev->dev_state == MEI_DEV_ENABLED)
853                                 schedule_work(&dev->bus_rescan_work);
854                 }
855         }
856         cl->status = mei_cl_conn_status_to_errno(rs->status);
857 }
858
859 /**
860  * mei_hbm_cl_res - process hbm response received on behalf
861  *         an client
862  *
863  * @dev: the device structure
864  * @rs:  hbm client message
865  * @fop_type: file operation type
866  */
867 static void mei_hbm_cl_res(struct mei_device *dev,
868                            struct mei_hbm_cl_cmd *rs,
869                            enum mei_cb_file_ops fop_type)
870 {
871         struct mei_cl *cl;
872         struct mei_cl_cb *cb, *next;
873
874         cl = NULL;
875         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
876
877                 cl = cb->cl;
878
879                 if (cb->fop_type != fop_type)
880                         continue;
881
882                 if (mei_hbm_cl_addr_equal(cl, rs)) {
883                         list_del_init(&cb->list);
884                         break;
885                 }
886         }
887
888         if (!cl)
889                 return;
890
891         switch (fop_type) {
892         case MEI_FOP_CONNECT:
893                 mei_hbm_cl_connect_res(dev, cl, rs);
894                 break;
895         case MEI_FOP_DISCONNECT:
896                 mei_hbm_cl_disconnect_res(dev, cl, rs);
897                 break;
898         case MEI_FOP_NOTIFY_START:
899                 mei_hbm_cl_notify_start_res(dev, cl, rs);
900                 break;
901         case MEI_FOP_NOTIFY_STOP:
902                 mei_hbm_cl_notify_stop_res(dev, cl, rs);
903                 break;
904         default:
905                 return;
906         }
907
908         cl->timer_count = 0;
909         wake_up(&cl->wait);
910 }
911
912
913 /**
914  * mei_hbm_fw_disconnect_req - disconnect request initiated by ME firmware
915  *  host sends disconnect response
916  *
917  * @dev: the device structure.
918  * @disconnect_req: disconnect request bus message from the me
919  *
920  * Return: -ENOMEM on allocation failure
921  */
922 static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
923                 struct hbm_client_connect_request *disconnect_req)
924 {
925         struct mei_cl *cl;
926         struct mei_cl_cb *cb;
927
928         cl = mei_hbm_cl_find_by_cmd(dev, disconnect_req);
929         if (cl) {
930                 cl_warn(dev, cl, "fw disconnect request received\n");
931                 cl->state = MEI_FILE_DISCONNECTING;
932                 cl->timer_count = 0;
933
934                 cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_DISCONNECT_RSP,
935                                                NULL);
936                 if (!cb)
937                         return -ENOMEM;
938         }
939         return 0;
940 }
941
942 /**
943  * mei_hbm_pg_enter_res - PG enter response received
944  *
945  * @dev: the device structure.
946  *
947  * Return: 0 on success, -EPROTO on state mismatch
948  */
949 static int mei_hbm_pg_enter_res(struct mei_device *dev)
950 {
951         if (mei_pg_state(dev) != MEI_PG_OFF ||
952             dev->pg_event != MEI_PG_EVENT_WAIT) {
953                 dev_err(dev->dev, "hbm: pg entry response: state mismatch [%s, %d]\n",
954                         mei_pg_state_str(mei_pg_state(dev)), dev->pg_event);
955                 return -EPROTO;
956         }
957
958         dev->pg_event = MEI_PG_EVENT_RECEIVED;
959         wake_up(&dev->wait_pg);
960
961         return 0;
962 }
963
964 /**
965  * mei_hbm_pg_resume - process with PG resume
966  *
967  * @dev: the device structure.
968  */
969 void mei_hbm_pg_resume(struct mei_device *dev)
970 {
971         pm_request_resume(dev->dev);
972 }
973 EXPORT_SYMBOL_GPL(mei_hbm_pg_resume);
974
975 /**
976  * mei_hbm_pg_exit_res - PG exit response received
977  *
978  * @dev: the device structure.
979  *
980  * Return: 0 on success, -EPROTO on state mismatch
981  */
982 static int mei_hbm_pg_exit_res(struct mei_device *dev)
983 {
984         if (mei_pg_state(dev) != MEI_PG_ON ||
985             (dev->pg_event != MEI_PG_EVENT_WAIT &&
986              dev->pg_event != MEI_PG_EVENT_IDLE)) {
987                 dev_err(dev->dev, "hbm: pg exit response: state mismatch [%s, %d]\n",
988                         mei_pg_state_str(mei_pg_state(dev)), dev->pg_event);
989                 return -EPROTO;
990         }
991
992         switch (dev->pg_event) {
993         case MEI_PG_EVENT_WAIT:
994                 dev->pg_event = MEI_PG_EVENT_RECEIVED;
995                 wake_up(&dev->wait_pg);
996                 break;
997         case MEI_PG_EVENT_IDLE:
998                 /*
999                 * If the driver is not waiting on this then
1000                 * this is HW initiated exit from PG.
1001                 * Start runtime pm resume sequence to exit from PG.
1002                 */
1003                 dev->pg_event = MEI_PG_EVENT_RECEIVED;
1004                 mei_hbm_pg_resume(dev);
1005                 break;
1006         default:
1007                 WARN(1, "hbm: pg exit response: unexpected pg event = %d\n",
1008                      dev->pg_event);
1009                 return -EPROTO;
1010         }
1011
1012         return 0;
1013 }
1014
1015 /**
1016  * mei_hbm_config_features - check what hbm features and commands
1017  *        are supported by the fw
1018  *
1019  * @dev: the device structure
1020  */
1021 static void mei_hbm_config_features(struct mei_device *dev)
1022 {
1023         /* Power Gating Isolation Support */
1024         dev->hbm_f_pg_supported = 0;
1025         if (dev->version.major_version > HBM_MAJOR_VERSION_PGI)
1026                 dev->hbm_f_pg_supported = 1;
1027
1028         if (dev->version.major_version == HBM_MAJOR_VERSION_PGI &&
1029             dev->version.minor_version >= HBM_MINOR_VERSION_PGI)
1030                 dev->hbm_f_pg_supported = 1;
1031
1032         if (dev->version.major_version >= HBM_MAJOR_VERSION_DC)
1033                 dev->hbm_f_dc_supported = 1;
1034
1035         if (dev->version.major_version >= HBM_MAJOR_VERSION_IE)
1036                 dev->hbm_f_ie_supported = 1;
1037
1038         /* disconnect on connect timeout instead of link reset */
1039         if (dev->version.major_version >= HBM_MAJOR_VERSION_DOT)
1040                 dev->hbm_f_dot_supported = 1;
1041
1042         /* Notification Event Support */
1043         if (dev->version.major_version >= HBM_MAJOR_VERSION_EV)
1044                 dev->hbm_f_ev_supported = 1;
1045
1046         /* Fixed Address Client Support */
1047         if (dev->version.major_version >= HBM_MAJOR_VERSION_FA)
1048                 dev->hbm_f_fa_supported = 1;
1049
1050         /* OS ver message Support */
1051         if (dev->version.major_version >= HBM_MAJOR_VERSION_OS)
1052                 dev->hbm_f_os_supported = 1;
1053
1054         /* DMA Ring Support */
1055         if (dev->version.major_version > HBM_MAJOR_VERSION_DR ||
1056             (dev->version.major_version == HBM_MAJOR_VERSION_DR &&
1057              dev->version.minor_version >= HBM_MINOR_VERSION_DR))
1058                 dev->hbm_f_dr_supported = 1;
1059 }
1060
1061 /**
1062  * mei_hbm_version_is_supported - checks whether the driver can
1063  *     support the hbm version of the device
1064  *
1065  * @dev: the device structure
1066  * Return: true if driver can support hbm version of the device
1067  */
1068 bool mei_hbm_version_is_supported(struct mei_device *dev)
1069 {
1070         return  (dev->version.major_version < HBM_MAJOR_VERSION) ||
1071                 (dev->version.major_version == HBM_MAJOR_VERSION &&
1072                  dev->version.minor_version <= HBM_MINOR_VERSION);
1073 }
1074
1075 /**
1076  * mei_hbm_dispatch - bottom half read routine after ISR to
1077  * handle the read bus message cmd processing.
1078  *
1079  * @dev: the device structure
1080  * @hdr: header of bus message
1081  *
1082  * Return: 0 on success and < 0 on failure
1083  */
1084 int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
1085 {
1086         struct mei_bus_message *mei_msg;
1087         struct hbm_host_version_response *version_res;
1088         struct hbm_props_response *props_res;
1089         struct hbm_host_enum_response *enum_res;
1090         struct hbm_dma_setup_response *dma_setup_res;
1091         struct hbm_add_client_request *add_cl_req;
1092         int ret;
1093
1094         struct mei_hbm_cl_cmd *cl_cmd;
1095         struct hbm_client_connect_request *disconnect_req;
1096         struct hbm_flow_control *fctrl;
1097
1098         /* read the message to our buffer */
1099         BUG_ON(hdr->length >= sizeof(dev->rd_msg_buf));
1100         mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
1101         mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
1102         cl_cmd  = (struct mei_hbm_cl_cmd *)mei_msg;
1103
1104         /* ignore spurious message and prevent reset nesting
1105          * hbm is put to idle during system reset
1106          */
1107         if (dev->hbm_state == MEI_HBM_IDLE) {
1108                 dev_dbg(dev->dev, "hbm: state is idle ignore spurious messages\n");
1109                 return 0;
1110         }
1111
1112         switch (mei_msg->hbm_cmd) {
1113         case HOST_START_RES_CMD:
1114                 dev_dbg(dev->dev, "hbm: start: response message received.\n");
1115
1116                 dev->init_clients_timer = 0;
1117
1118                 version_res = (struct hbm_host_version_response *)mei_msg;
1119
1120                 dev_dbg(dev->dev, "HBM VERSION: DRIVER=%02d:%02d DEVICE=%02d:%02d\n",
1121                                 HBM_MAJOR_VERSION, HBM_MINOR_VERSION,
1122                                 version_res->me_max_version.major_version,
1123                                 version_res->me_max_version.minor_version);
1124
1125                 if (version_res->host_version_supported) {
1126                         dev->version.major_version = HBM_MAJOR_VERSION;
1127                         dev->version.minor_version = HBM_MINOR_VERSION;
1128                 } else {
1129                         dev->version.major_version =
1130                                 version_res->me_max_version.major_version;
1131                         dev->version.minor_version =
1132                                 version_res->me_max_version.minor_version;
1133                 }
1134
1135                 if (!mei_hbm_version_is_supported(dev)) {
1136                         dev_warn(dev->dev, "hbm: start: version mismatch - stopping the driver.\n");
1137
1138                         dev->hbm_state = MEI_HBM_STOPPED;
1139                         if (mei_hbm_stop_req(dev)) {
1140                                 dev_err(dev->dev, "hbm: start: failed to send stop request\n");
1141                                 return -EIO;
1142                         }
1143                         break;
1144                 }
1145
1146                 mei_hbm_config_features(dev);
1147
1148                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1149                     dev->hbm_state != MEI_HBM_STARTING) {
1150                         dev_err(dev->dev, "hbm: start: state mismatch, [%d, %d]\n",
1151                                 dev->dev_state, dev->hbm_state);
1152                         return -EPROTO;
1153                 }
1154
1155                 if (dev->hbm_f_dr_supported) {
1156                         if (mei_dmam_ring_alloc(dev))
1157                                 dev_info(dev->dev, "running w/o dma ring\n");
1158                         if (mei_dma_ring_is_allocated(dev)) {
1159                                 if (mei_hbm_dma_setup_req(dev))
1160                                         return -EIO;
1161
1162                                 wake_up(&dev->wait_hbm_start);
1163                                 break;
1164                         }
1165                 }
1166
1167                 dev->hbm_f_dr_supported = 0;
1168                 mei_dmam_ring_free(dev);
1169
1170                 if (mei_hbm_enum_clients_req(dev))
1171                         return -EIO;
1172
1173                 wake_up(&dev->wait_hbm_start);
1174                 break;
1175
1176         case MEI_HBM_DMA_SETUP_RES_CMD:
1177                 dev_dbg(dev->dev, "hbm: dma setup response: message received.\n");
1178
1179                 dev->init_clients_timer = 0;
1180
1181                 if (dev->hbm_state != MEI_HBM_DR_SETUP) {
1182                         dev_err(dev->dev, "hbm: dma setup response: state mismatch, [%d, %d]\n",
1183                                 dev->dev_state, dev->hbm_state);
1184                         return -EPROTO;
1185                 }
1186
1187                 dma_setup_res = (struct hbm_dma_setup_response *)mei_msg;
1188
1189                 if (dma_setup_res->status) {
1190                         u8 status = dma_setup_res->status;
1191
1192                         if (status == MEI_HBMS_NOT_ALLOWED) {
1193                                 dev_dbg(dev->dev, "hbm: dma setup not allowed\n");
1194                         } else {
1195                                 dev_info(dev->dev, "hbm: dma setup response: failure = %d %s\n",
1196                                          status,
1197                                          mei_hbm_status_str(status));
1198                         }
1199                         dev->hbm_f_dr_supported = 0;
1200                         mei_dmam_ring_free(dev);
1201                 }
1202
1203                 if (mei_hbm_enum_clients_req(dev))
1204                         return -EIO;
1205                 break;
1206
1207         case CLIENT_CONNECT_RES_CMD:
1208                 dev_dbg(dev->dev, "hbm: client connect response: message received.\n");
1209                 mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_CONNECT);
1210                 break;
1211
1212         case CLIENT_DISCONNECT_RES_CMD:
1213                 dev_dbg(dev->dev, "hbm: client disconnect response: message received.\n");
1214                 mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_DISCONNECT);
1215                 break;
1216
1217         case MEI_FLOW_CONTROL_CMD:
1218                 dev_dbg(dev->dev, "hbm: client flow control response: message received.\n");
1219
1220                 fctrl = (struct hbm_flow_control *)mei_msg;
1221                 mei_hbm_cl_tx_flow_ctrl_creds_res(dev, fctrl);
1222                 break;
1223
1224         case MEI_PG_ISOLATION_ENTRY_RES_CMD:
1225                 dev_dbg(dev->dev, "hbm: power gate isolation entry response received\n");
1226                 ret = mei_hbm_pg_enter_res(dev);
1227                 if (ret)
1228                         return ret;
1229                 break;
1230
1231         case MEI_PG_ISOLATION_EXIT_REQ_CMD:
1232                 dev_dbg(dev->dev, "hbm: power gate isolation exit request received\n");
1233                 ret = mei_hbm_pg_exit_res(dev);
1234                 if (ret)
1235                         return ret;
1236                 break;
1237
1238         case HOST_CLIENT_PROPERTIES_RES_CMD:
1239                 dev_dbg(dev->dev, "hbm: properties response: message received.\n");
1240
1241                 dev->init_clients_timer = 0;
1242
1243                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1244                     dev->hbm_state != MEI_HBM_CLIENT_PROPERTIES) {
1245                         dev_err(dev->dev, "hbm: properties response: state mismatch, [%d, %d]\n",
1246                                 dev->dev_state, dev->hbm_state);
1247                         return -EPROTO;
1248                 }
1249
1250                 props_res = (struct hbm_props_response *)mei_msg;
1251
1252                 if (props_res->status == MEI_HBMS_CLIENT_NOT_FOUND) {
1253                         dev_dbg(dev->dev, "hbm: properties response: %d CLIENT_NOT_FOUND\n",
1254                                 props_res->me_addr);
1255                 } else if (props_res->status) {
1256                         dev_err(dev->dev, "hbm: properties response: wrong status = %d %s\n",
1257                                 props_res->status,
1258                                 mei_hbm_status_str(props_res->status));
1259                         return -EPROTO;
1260                 } else {
1261                         mei_hbm_me_cl_add(dev, props_res);
1262                 }
1263
1264                 /* request property for the next client */
1265                 if (mei_hbm_prop_req(dev, props_res->me_addr + 1))
1266                         return -EIO;
1267
1268                 break;
1269
1270         case HOST_ENUM_RES_CMD:
1271                 dev_dbg(dev->dev, "hbm: enumeration response: message received\n");
1272
1273                 dev->init_clients_timer = 0;
1274
1275                 enum_res = (struct hbm_host_enum_response *) mei_msg;
1276                 BUILD_BUG_ON(sizeof(dev->me_clients_map)
1277                                 < sizeof(enum_res->valid_addresses));
1278                 memcpy(dev->me_clients_map, enum_res->valid_addresses,
1279                                 sizeof(enum_res->valid_addresses));
1280
1281                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1282                     dev->hbm_state != MEI_HBM_ENUM_CLIENTS) {
1283                         dev_err(dev->dev, "hbm: enumeration response: state mismatch, [%d, %d]\n",
1284                                 dev->dev_state, dev->hbm_state);
1285                         return -EPROTO;
1286                 }
1287
1288                 dev->hbm_state = MEI_HBM_CLIENT_PROPERTIES;
1289
1290                 /* first property request */
1291                 if (mei_hbm_prop_req(dev, 0))
1292                         return -EIO;
1293
1294                 break;
1295
1296         case HOST_STOP_RES_CMD:
1297                 dev_dbg(dev->dev, "hbm: stop response: message received\n");
1298
1299                 dev->init_clients_timer = 0;
1300
1301                 if (dev->hbm_state != MEI_HBM_STOPPED) {
1302                         dev_err(dev->dev, "hbm: stop response: state mismatch, [%d, %d]\n",
1303                                 dev->dev_state, dev->hbm_state);
1304                         return -EPROTO;
1305                 }
1306
1307                 dev->dev_state = MEI_DEV_POWER_DOWN;
1308                 dev_info(dev->dev, "hbm: stop response: resetting.\n");
1309                 /* force the reset */
1310                 return -EPROTO;
1311                 break;
1312
1313         case CLIENT_DISCONNECT_REQ_CMD:
1314                 dev_dbg(dev->dev, "hbm: disconnect request: message received\n");
1315
1316                 disconnect_req = (struct hbm_client_connect_request *)mei_msg;
1317                 mei_hbm_fw_disconnect_req(dev, disconnect_req);
1318                 break;
1319
1320         case ME_STOP_REQ_CMD:
1321                 dev_dbg(dev->dev, "hbm: stop request: message received\n");
1322                 dev->hbm_state = MEI_HBM_STOPPED;
1323                 if (mei_hbm_stop_req(dev)) {
1324                         dev_err(dev->dev, "hbm: stop request: failed to send stop request\n");
1325                         return -EIO;
1326                 }
1327                 break;
1328
1329         case MEI_HBM_ADD_CLIENT_REQ_CMD:
1330                 dev_dbg(dev->dev, "hbm: add client request received\n");
1331                 /*
1332                  * after the host receives the enum_resp
1333                  * message clients may be added or removed
1334                  */
1335                 if (dev->hbm_state <= MEI_HBM_ENUM_CLIENTS ||
1336                     dev->hbm_state >= MEI_HBM_STOPPED) {
1337                         dev_err(dev->dev, "hbm: add client: state mismatch, [%d, %d]\n",
1338                                 dev->dev_state, dev->hbm_state);
1339                         return -EPROTO;
1340                 }
1341                 add_cl_req = (struct hbm_add_client_request *)mei_msg;
1342                 ret = mei_hbm_fw_add_cl_req(dev, add_cl_req);
1343                 if (ret) {
1344                         dev_err(dev->dev, "hbm: add client: failed to send response %d\n",
1345                                 ret);
1346                         return -EIO;
1347                 }
1348                 dev_dbg(dev->dev, "hbm: add client request processed\n");
1349                 break;
1350
1351         case MEI_HBM_NOTIFY_RES_CMD:
1352                 dev_dbg(dev->dev, "hbm: notify response received\n");
1353                 mei_hbm_cl_res(dev, cl_cmd, notify_res_to_fop(cl_cmd));
1354                 break;
1355
1356         case MEI_HBM_NOTIFICATION_CMD:
1357                 dev_dbg(dev->dev, "hbm: notification\n");
1358                 mei_hbm_cl_notify(dev, cl_cmd);
1359                 break;
1360
1361         default:
1362                 WARN(1, "hbm: wrong command %d\n", mei_msg->hbm_cmd);
1363                 return -EPROTO;
1364
1365         }
1366         return 0;
1367 }
1368