mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-29 22:14:41 +08:00
93bc3feee8
In all but the very special case of a system with _only_ glink_rpm, GLINK is dependent on glink_ssr, so move it to rpmsg and combine it with qcom_glink_native in the new qcom_glink kernel module. Acked-by: Chris Lew <clew@codeaurora.org> Acked-by: Rishabh Bhatnagar <rishabhb@codeaurora.org> Link: https://lore.kernel.org/r/20200423003736.2027371-4-bjorn.andersson@linaro.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
167 lines
4.0 KiB
C
167 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (c) 2014-2017, The Linux Foundation. All rights reserved.
|
|
* Copyright (c) 2017, Linaro Ltd.
|
|
*/
|
|
|
|
#include <linux/completion.h>
|
|
#include <linux/module.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/rpmsg.h>
|
|
#include <linux/remoteproc/qcom_rproc.h>
|
|
|
|
/**
|
|
* struct do_cleanup_msg - The data structure for an SSR do_cleanup message
|
|
* version: The G-Link SSR protocol version
|
|
* command: The G-Link SSR command - do_cleanup
|
|
* seq_num: Sequence number
|
|
* name_len: Length of the name of the subsystem being restarted
|
|
* name: G-Link edge name of the subsystem being restarted
|
|
*/
|
|
struct do_cleanup_msg {
|
|
__le32 version;
|
|
__le32 command;
|
|
__le32 seq_num;
|
|
__le32 name_len;
|
|
char name[32];
|
|
};
|
|
|
|
/**
|
|
* struct cleanup_done_msg - The data structure for an SSR cleanup_done message
|
|
* version: The G-Link SSR protocol version
|
|
* response: The G-Link SSR response to a do_cleanup command, cleanup_done
|
|
* seq_num: Sequence number
|
|
*/
|
|
struct cleanup_done_msg {
|
|
__le32 version;
|
|
__le32 response;
|
|
__le32 seq_num;
|
|
};
|
|
|
|
/**
|
|
* G-Link SSR protocol commands
|
|
*/
|
|
#define GLINK_SSR_DO_CLEANUP 0
|
|
#define GLINK_SSR_CLEANUP_DONE 1
|
|
|
|
struct glink_ssr {
|
|
struct device *dev;
|
|
struct rpmsg_endpoint *ept;
|
|
|
|
struct notifier_block nb;
|
|
|
|
u32 seq_num;
|
|
struct completion completion;
|
|
};
|
|
|
|
/* Notifier list for all registered glink_ssr instances */
|
|
static BLOCKING_NOTIFIER_HEAD(ssr_notifiers);
|
|
|
|
/**
|
|
* qcom_glink_ssr_notify() - notify GLINK SSR about stopped remoteproc
|
|
* @ssr_name: name of the remoteproc that has been stopped
|
|
*/
|
|
void qcom_glink_ssr_notify(const char *ssr_name)
|
|
{
|
|
blocking_notifier_call_chain(&ssr_notifiers, 0, (void *)ssr_name);
|
|
}
|
|
EXPORT_SYMBOL_GPL(qcom_glink_ssr_notify);
|
|
|
|
static int qcom_glink_ssr_callback(struct rpmsg_device *rpdev,
|
|
void *data, int len, void *priv, u32 addr)
|
|
{
|
|
struct cleanup_done_msg *msg = data;
|
|
struct glink_ssr *ssr = dev_get_drvdata(&rpdev->dev);
|
|
|
|
if (len < sizeof(*msg)) {
|
|
dev_err(ssr->dev, "message too short\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (le32_to_cpu(msg->version) != 0)
|
|
return -EINVAL;
|
|
|
|
if (le32_to_cpu(msg->response) != GLINK_SSR_CLEANUP_DONE)
|
|
return 0;
|
|
|
|
if (le32_to_cpu(msg->seq_num) != ssr->seq_num) {
|
|
dev_err(ssr->dev, "invalid sequence number of response\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
complete(&ssr->completion);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qcom_glink_ssr_notifier_call(struct notifier_block *nb,
|
|
unsigned long event,
|
|
void *data)
|
|
{
|
|
struct glink_ssr *ssr = container_of(nb, struct glink_ssr, nb);
|
|
struct do_cleanup_msg msg;
|
|
char *ssr_name = data;
|
|
int ret;
|
|
|
|
ssr->seq_num++;
|
|
reinit_completion(&ssr->completion);
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
msg.command = cpu_to_le32(GLINK_SSR_DO_CLEANUP);
|
|
msg.seq_num = cpu_to_le32(ssr->seq_num);
|
|
msg.name_len = cpu_to_le32(strlen(ssr_name));
|
|
strlcpy(msg.name, ssr_name, sizeof(msg.name));
|
|
|
|
ret = rpmsg_send(ssr->ept, &msg, sizeof(msg));
|
|
if (ret < 0)
|
|
dev_err(ssr->dev, "failed to send cleanup message\n");
|
|
|
|
ret = wait_for_completion_timeout(&ssr->completion, HZ);
|
|
if (!ret)
|
|
dev_err(ssr->dev, "timeout waiting for cleanup done message\n");
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int qcom_glink_ssr_probe(struct rpmsg_device *rpdev)
|
|
{
|
|
struct glink_ssr *ssr;
|
|
|
|
ssr = devm_kzalloc(&rpdev->dev, sizeof(*ssr), GFP_KERNEL);
|
|
if (!ssr)
|
|
return -ENOMEM;
|
|
|
|
init_completion(&ssr->completion);
|
|
|
|
ssr->dev = &rpdev->dev;
|
|
ssr->ept = rpdev->ept;
|
|
ssr->nb.notifier_call = qcom_glink_ssr_notifier_call;
|
|
|
|
dev_set_drvdata(&rpdev->dev, ssr);
|
|
|
|
return blocking_notifier_chain_register(&ssr_notifiers, &ssr->nb);
|
|
}
|
|
|
|
static void qcom_glink_ssr_remove(struct rpmsg_device *rpdev)
|
|
{
|
|
struct glink_ssr *ssr = dev_get_drvdata(&rpdev->dev);
|
|
|
|
blocking_notifier_chain_unregister(&ssr_notifiers, &ssr->nb);
|
|
}
|
|
|
|
static const struct rpmsg_device_id qcom_glink_ssr_match[] = {
|
|
{ "glink_ssr" },
|
|
{}
|
|
};
|
|
|
|
static struct rpmsg_driver qcom_glink_ssr_driver = {
|
|
.probe = qcom_glink_ssr_probe,
|
|
.remove = qcom_glink_ssr_remove,
|
|
.callback = qcom_glink_ssr_callback,
|
|
.id_table = qcom_glink_ssr_match,
|
|
.drv = {
|
|
.name = "qcom_glink_ssr",
|
|
},
|
|
};
|
|
module_rpmsg_driver(qcom_glink_ssr_driver);
|