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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d13a5c8c4c
With the removal of VLAIS the size was incorrectly changed to only cover
the headers of the packet, resulting in "empty" requests being sent to
the RPM. Correct this so the entire message is transfered.
Fixes: 50e1b29b44
("soc: qcom: smd: Remove use of VLAIS")
Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Andy Gross <agross@codeaurora.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
253 lines
6.2 KiB
C
253 lines
6.2 KiB
C
/*
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* Copyright (c) 2015, Sony Mobile Communications AB.
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* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/of_platform.h>
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#include <linux/io.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/soc/qcom/smd.h>
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#include <linux/soc/qcom/smd-rpm.h>
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#define RPM_REQUEST_TIMEOUT (5 * HZ)
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/**
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* struct qcom_smd_rpm - state of the rpm device driver
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* @rpm_channel: reference to the smd channel
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* @ack: completion for acks
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* @lock: mutual exclusion around the send/complete pair
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* @ack_status: result of the rpm request
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*/
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struct qcom_smd_rpm {
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struct qcom_smd_channel *rpm_channel;
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struct completion ack;
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struct mutex lock;
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int ack_status;
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};
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/**
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* struct qcom_rpm_header - header for all rpm requests and responses
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* @service_type: identifier of the service
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* @length: length of the payload
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*/
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struct qcom_rpm_header {
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__le32 service_type;
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__le32 length;
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};
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/**
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* struct qcom_rpm_request - request message to the rpm
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* @msg_id: identifier of the outgoing message
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* @flags: active/sleep state flags
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* @type: resource type
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* @id: resource id
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* @data_len: length of the payload following this header
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*/
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struct qcom_rpm_request {
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__le32 msg_id;
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__le32 flags;
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__le32 type;
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__le32 id;
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__le32 data_len;
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};
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/**
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* struct qcom_rpm_message - response message from the rpm
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* @msg_type: indicator of the type of message
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* @length: the size of this message, including the message header
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* @msg_id: message id
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* @message: textual message from the rpm
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*
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* Multiple of these messages can be stacked in an rpm message.
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*/
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struct qcom_rpm_message {
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__le32 msg_type;
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__le32 length;
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union {
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__le32 msg_id;
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u8 message[0];
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};
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};
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#define RPM_SERVICE_TYPE_REQUEST 0x00716572 /* "req\0" */
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#define RPM_MSG_TYPE_ERR 0x00727265 /* "err\0" */
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#define RPM_MSG_TYPE_MSG_ID 0x2367736d /* "msg#" */
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/**
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* qcom_rpm_smd_write - write @buf to @type:@id
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* @rpm: rpm handle
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* @type: resource type
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* @id: resource identifier
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* @buf: the data to be written
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* @count: number of bytes in @buf
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*/
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int qcom_rpm_smd_write(struct qcom_smd_rpm *rpm,
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int state,
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u32 type, u32 id,
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void *buf,
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size_t count)
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{
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static unsigned msg_id = 1;
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int left;
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int ret;
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struct {
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struct qcom_rpm_header hdr;
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struct qcom_rpm_request req;
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u8 payload[];
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} *pkt;
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size_t size = sizeof(*pkt) + count;
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/* SMD packets to the RPM may not exceed 256 bytes */
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if (WARN_ON(size >= 256))
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return -EINVAL;
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pkt = kmalloc(size, GFP_KERNEL);
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if (!pkt)
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return -ENOMEM;
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mutex_lock(&rpm->lock);
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pkt->hdr.service_type = cpu_to_le32(RPM_SERVICE_TYPE_REQUEST);
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pkt->hdr.length = cpu_to_le32(sizeof(struct qcom_rpm_request) + count);
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pkt->req.msg_id = cpu_to_le32(msg_id++);
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pkt->req.flags = cpu_to_le32(state);
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pkt->req.type = cpu_to_le32(type);
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pkt->req.id = cpu_to_le32(id);
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pkt->req.data_len = cpu_to_le32(count);
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memcpy(pkt->payload, buf, count);
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ret = qcom_smd_send(rpm->rpm_channel, pkt, size);
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if (ret)
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goto out;
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left = wait_for_completion_timeout(&rpm->ack, RPM_REQUEST_TIMEOUT);
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if (!left)
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ret = -ETIMEDOUT;
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else
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ret = rpm->ack_status;
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out:
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kfree(pkt);
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mutex_unlock(&rpm->lock);
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return ret;
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}
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EXPORT_SYMBOL(qcom_rpm_smd_write);
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static int qcom_smd_rpm_callback(struct qcom_smd_device *qsdev,
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const void *data,
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size_t count)
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{
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const struct qcom_rpm_header *hdr = data;
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size_t hdr_length = le32_to_cpu(hdr->length);
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const struct qcom_rpm_message *msg;
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struct qcom_smd_rpm *rpm = dev_get_drvdata(&qsdev->dev);
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const u8 *buf = data + sizeof(struct qcom_rpm_header);
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const u8 *end = buf + hdr_length;
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char msgbuf[32];
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int status = 0;
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u32 len, msg_length;
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if (le32_to_cpu(hdr->service_type) != RPM_SERVICE_TYPE_REQUEST ||
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hdr_length < sizeof(struct qcom_rpm_message)) {
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dev_err(&qsdev->dev, "invalid request\n");
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return 0;
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}
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while (buf < end) {
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msg = (struct qcom_rpm_message *)buf;
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msg_length = le32_to_cpu(msg->length);
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switch (le32_to_cpu(msg->msg_type)) {
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case RPM_MSG_TYPE_MSG_ID:
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break;
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case RPM_MSG_TYPE_ERR:
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len = min_t(u32, ALIGN(msg_length, 4), sizeof(msgbuf));
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memcpy_fromio(msgbuf, msg->message, len);
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msgbuf[len - 1] = 0;
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if (!strcmp(msgbuf, "resource does not exist"))
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status = -ENXIO;
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else
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status = -EINVAL;
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break;
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}
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buf = PTR_ALIGN(buf + 2 * sizeof(u32) + msg_length, 4);
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}
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rpm->ack_status = status;
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complete(&rpm->ack);
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return 0;
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}
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static int qcom_smd_rpm_probe(struct qcom_smd_device *sdev)
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{
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struct qcom_smd_rpm *rpm;
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rpm = devm_kzalloc(&sdev->dev, sizeof(*rpm), GFP_KERNEL);
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if (!rpm)
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return -ENOMEM;
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mutex_init(&rpm->lock);
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init_completion(&rpm->ack);
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rpm->rpm_channel = sdev->channel;
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dev_set_drvdata(&sdev->dev, rpm);
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return of_platform_populate(sdev->dev.of_node, NULL, NULL, &sdev->dev);
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}
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static void qcom_smd_rpm_remove(struct qcom_smd_device *sdev)
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{
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of_platform_depopulate(&sdev->dev);
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}
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static const struct of_device_id qcom_smd_rpm_of_match[] = {
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{ .compatible = "qcom,rpm-msm8974" },
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{}
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};
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MODULE_DEVICE_TABLE(of, qcom_smd_rpm_of_match);
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static struct qcom_smd_driver qcom_smd_rpm_driver = {
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.probe = qcom_smd_rpm_probe,
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.remove = qcom_smd_rpm_remove,
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.callback = qcom_smd_rpm_callback,
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.driver = {
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.name = "qcom_smd_rpm",
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.owner = THIS_MODULE,
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.of_match_table = qcom_smd_rpm_of_match,
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},
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};
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static int __init qcom_smd_rpm_init(void)
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{
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return qcom_smd_driver_register(&qcom_smd_rpm_driver);
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}
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arch_initcall(qcom_smd_rpm_init);
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static void __exit qcom_smd_rpm_exit(void)
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{
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qcom_smd_driver_unregister(&qcom_smd_rpm_driver);
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}
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module_exit(qcom_smd_rpm_exit);
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MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>");
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MODULE_DESCRIPTION("Qualcomm SMD backed RPM driver");
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MODULE_LICENSE("GPL v2");
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