dmub_srv_stat.c

  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 */
 46enum 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->instance = cmd.dp_aux_reply.control.instance;
 75		notify->result = cmd.dp_aux_reply.control.result;
 76		dmub_memcpy((void *)&notify->aux_reply,
 77			(void *)&cmd.dp_aux_reply.reply_data, sizeof(struct aux_reply_data));
 78		break;
 79	case DMUB_OUT_CMD__DP_HPD_NOTIFY:
 80		if (cmd.dp_hpd_notify.hpd_data.hpd_type == DP_HPD) {
 81			notify->type = DMUB_NOTIFICATION_HPD;
 82			notify->hpd_status = cmd.dp_hpd_notify.hpd_data.hpd_status;
 83		} else {
 84			notify->type = DMUB_NOTIFICATION_HPD_IRQ;
 85		}
 86
 87		notify->instance = cmd.dp_hpd_notify.hpd_data.instance;
 88		notify->result = AUX_RET_SUCCESS;
 89		break;
 90	case DMUB_OUT_CMD__SET_CONFIG_REPLY:
 91		notify->type = DMUB_NOTIFICATION_SET_CONFIG_REPLY;
 92		notify->instance = cmd.set_config_reply.set_config_reply_control.instance;
 93		notify->sc_status = cmd.set_config_reply.set_config_reply_control.status;
 94		break;
 95	case DMUB_OUT_CMD__DPIA_NOTIFICATION:
 96		notify->type = DMUB_NOTIFICATION_DPIA_NOTIFICATION;
 97		notify->instance = cmd.dpia_notification.payload.header.instance;
 98		break;
 99	case DMUB_OUT_CMD__HPD_SENSE_NOTIFY:
100		notify->type = DMUB_NOTIFICATION_HPD_SENSE_NOTIFY;
101		dmub_memcpy(&notify->hpd_sense_notify,
102			    &cmd.hpd_sense_notify.data,
103			    sizeof(cmd.hpd_sense_notify.data));
104		break;
105	case DMUB_OUT_CMD__FUSED_IO:
106		notify->type = DMUB_NOTIFICATION_FUSED_IO;
107		dmub_memcpy(&notify->fused_request, &cmd.fused_io.request, sizeof(cmd.fused_io.request));
108		break;
109	default:
110		notify->type = DMUB_NOTIFICATION_NO_DATA;
111		break;
112	}
113
114	/* Pop outbox1 ringbuffer and update read pointer */
115	dmub_rb_pop_front(&dmub->outbox1_rb);
116	dmub->hw_funcs.set_outbox1_rptr(dmub, dmub->outbox1_rb.rptr);
117
118	/**
119	 * Notify dc whether dmub has a pending outbox message,
120	 * this is to avoid one more call to dmub_srv_stat_get_notification
121	 */
122	if (dmub_rb_empty(&dmub->outbox1_rb))
123		notify->pending_notification = false;
124	else
125		notify->pending_notification = true;
126
127	return DMUB_STATUS_OK;
128}