1 /*
2 * Copyright 2019 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: AMD
23 *
24 */
25
26 #include "dmub/dmub_srv_stat.h"
27 #include "dmub/inc/dmub_cmd.h"
28
29 /**
30 * DOC: DMUB_SRV STAT Interface
31 *
32 * These interfaces are called without acquiring DAL and DC locks.
33 * Hence, there is limitations on whese interfaces can access. Only
34 * variables exclusively defined for these interfaces can be modified.
35 */
36
37 /**
38 * dmub_srv_stat_get_notification - Retrieves a dmub outbox notification, set up dmub notification
39 * structure with message information. Also a pending bit if queue
40 * is having more notifications
41 * @dmub: dmub srv structure
42 * @notify: dmub notification structure to be filled up
43 *
44 * Returns: dmub_status
45 */
dmub_srv_stat_get_notification(struct dmub_srv * dmub,struct dmub_notification * notify)46 enum dmub_status dmub_srv_stat_get_notification(struct dmub_srv *dmub,
47 struct dmub_notification *notify)
48 {
49 /**
50 * This function is called without dal and dc locks, so
51 * we shall not modify any dmub variables, only dmub->outbox1_rb
52 * is exempted as it is exclusively accessed by this function
53 */
54 union dmub_rb_out_cmd cmd = {0};
55
56 if (!dmub->hw_init) {
57 notify->type = DMUB_NOTIFICATION_NO_DATA;
58 notify->pending_notification = false;
59 return DMUB_STATUS_INVALID;
60 }
61
62 /* Get write pointer which is updated by dmub */
63 dmub->outbox1_rb.wrpt = dmub->hw_funcs.get_outbox1_wptr(dmub);
64
65 if (!dmub_rb_out_front(&dmub->outbox1_rb, &cmd)) {
66 notify->type = DMUB_NOTIFICATION_NO_DATA;
67 notify->pending_notification = false;
68 return DMUB_STATUS_OK;
69 }
70
71 switch (cmd.cmd_common.header.type) {
72 case DMUB_OUT_CMD__DP_AUX_REPLY:
73 notify->type = DMUB_NOTIFICATION_AUX_REPLY;
74 notify->link_index = cmd.dp_aux_reply.control.instance;
75 notify->result = cmd.dp_aux_reply.control.result;
76 dmub_memcpy((void *)¬ify->aux_reply,
77 (void *)&cmd.dp_aux_reply.reply_data, sizeof(struct aux_reply_data));
78 break;
79 default:
80 notify->type = DMUB_NOTIFICATION_NO_DATA;
81 break;
82 }
83
84 /* Pop outbox1 ringbuffer and update read pointer */
85 dmub_rb_pop_front(&dmub->outbox1_rb);
86 dmub->hw_funcs.set_outbox1_rptr(dmub, dmub->outbox1_rb.rptr);
87
88 /**
89 * Notify dc whether dmub has a pending outbox message,
90 * this is to avoid one more call to dmub_srv_stat_get_notification
91 */
92 if (dmub_rb_empty(&dmub->outbox1_rb))
93 notify->pending_notification = false;
94 else
95 notify->pending_notification = true;
96
97 return DMUB_STATUS_OK;
98 }
99