Commit 1e140df0 authored by Bjorn Andersson's avatar Bjorn Andersson
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remoteproc: qcom: Add support for SSR notifications



This adds the remoteproc part of subsystem restart, which is responsible
for emitting notifications to other processors in the system about a
dying remoteproc instance.

These notifications are propagated to the various communication systems
in the various remote processors to shut down communication links that
was left in a dangling state as the remoteproc was stopped (or crashed).
Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
parent 1b0ef906
......@@ -38,6 +38,7 @@ struct adsp_data {
const char *firmware_name;
int pas_id;
bool has_aggre2_clk;
const char *ssr_name;
};
struct qcom_adsp {
......@@ -72,6 +73,7 @@ struct qcom_adsp {
size_t mem_size;
struct qcom_rproc_subdev smd_subdev;
struct qcom_rproc_ssr ssr_subdev;
};
static int adsp_load(struct rproc *rproc, const struct firmware *fw)
......@@ -402,6 +404,7 @@ static int adsp_probe(struct platform_device *pdev)
}
qcom_add_smd_subdev(rproc, &adsp->smd_subdev);
qcom_add_ssr_subdev(rproc, &adsp->ssr_subdev, desc->ssr_name);
ret = rproc_add(rproc);
if (ret)
......@@ -423,6 +426,7 @@ static int adsp_remove(struct platform_device *pdev)
rproc_del(adsp->rproc);
qcom_remove_smd_subdev(adsp->rproc, &adsp->smd_subdev);
qcom_remove_ssr_subdev(adsp->rproc, &adsp->ssr_subdev);
rproc_free(adsp->rproc);
return 0;
......@@ -433,6 +437,7 @@ static const struct adsp_data adsp_resource_init = {
.firmware_name = "adsp.mdt",
.pas_id = 1,
.has_aggre2_clk = false,
.ssr_name = "lpass",
};
static const struct adsp_data slpi_resource_init = {
......@@ -440,6 +445,7 @@ static const struct adsp_data slpi_resource_init = {
.firmware_name = "slpi.mdt",
.pas_id = 12,
.has_aggre2_clk = true,
.ssr_name = "dsps",
};
static const struct of_device_id adsp_of_match[] = {
......
......@@ -18,6 +18,7 @@
#include <linux/firmware.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/remoteproc.h>
#include <linux/rpmsg/qcom_smd.h>
......@@ -25,6 +26,9 @@
#include "qcom_common.h"
#define to_smd_subdev(d) container_of(d, struct qcom_rproc_subdev, subdev)
#define to_ssr_subdev(d) container_of(d, struct qcom_rproc_ssr, subdev)
BLOCKING_NOTIFIER_HEAD(ssr_notifiers);
/**
* qcom_mdt_find_rsc_table() - provide dummy resource table for remoteproc
......@@ -92,5 +96,72 @@ void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
}
EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev);
/**
* qcom_register_ssr_notifier() - register SSR notification handler
* @nb: notifier_block to notify for restart notifications
*
* Returns 0 on success, negative errno on failure.
*
* This register the @notify function as handler for restart notifications. As
* remote processors are stopped this function will be called, with the SSR
* name passed as a parameter.
*/
int qcom_register_ssr_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&ssr_notifiers, nb);
}
EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier);
/**
* qcom_unregister_ssr_notifier() - unregister SSR notification handler
* @nb: notifier_block to unregister
*/
void qcom_unregister_ssr_notifier(struct notifier_block *nb)
{
blocking_notifier_chain_unregister(&ssr_notifiers, nb);
}
EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);
static int ssr_notify_start(struct rproc_subdev *subdev)
{
return 0;
}
static void ssr_notify_stop(struct rproc_subdev *subdev)
{
struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
blocking_notifier_call_chain(&ssr_notifiers, 0, (void *)ssr->name);
}
/**
* qcom_add_ssr_subdev() - register subdevice as restart notification source
* @rproc: rproc handle
* @ssr: SSR subdevice handle
* @ssr_name: identifier to use for notifications originating from @rproc
*
* As the @ssr is registered with the @rproc SSR events will be sent to all
* registered listeners in the system as the remoteproc is shut down.
*/
void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
const char *ssr_name)
{
ssr->name = ssr_name;
rproc_add_subdev(rproc, &ssr->subdev, ssr_notify_start, ssr_notify_stop);
}
EXPORT_SYMBOL_GPL(qcom_add_ssr_subdev);
/**
* qcom_remove_ssr_subdev() - remove subdevice as restart notification source
* @rproc: rproc handle
* @ssr: SSR subdevice handle
*/
void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr)
{
rproc_remove_subdev(rproc, &ssr->subdev);
}
EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev);
MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver");
MODULE_LICENSE("GPL v2");
......@@ -12,6 +12,12 @@ struct qcom_rproc_subdev {
struct qcom_smd_edge *edge;
};
struct qcom_rproc_ssr {
struct rproc_subdev subdev;
const char *name;
};
struct resource_table *qcom_mdt_find_rsc_table(struct rproc *rproc,
const struct firmware *fw,
int *tablesz);
......@@ -19,4 +25,8 @@ struct resource_table *qcom_mdt_find_rsc_table(struct rproc *rproc,
void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd);
void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd);
void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
const char *ssr_name);
void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr);
#endif
......@@ -153,6 +153,7 @@ struct q6v5 {
size_t mpss_size;
struct qcom_rproc_subdev smd_subdev;
struct qcom_rproc_ssr ssr_subdev;
};
static int q6v5_regulator_init(struct device *dev, struct reg_info *regs,
......@@ -1038,6 +1039,7 @@ static int q6v5_probe(struct platform_device *pdev)
}
qcom_add_smd_subdev(rproc, &qproc->smd_subdev);
qcom_add_ssr_subdev(rproc, &qproc->ssr_subdev, "mpss");
ret = rproc_add(rproc);
if (ret)
......@@ -1058,6 +1060,7 @@ static int q6v5_remove(struct platform_device *pdev)
rproc_del(qproc->rproc);
qcom_remove_smd_subdev(qproc->rproc, &qproc->smd_subdev);
qcom_remove_ssr_subdev(qproc->rproc, &qproc->ssr_subdev);
rproc_free(qproc->rproc);
return 0;
......
#ifndef __QCOM_RPROC_H__
#define __QCOM_RPROC_H__
struct notifier_block;
#if IS_ENABLED(CONFIG_QCOM_RPROC_COMMON)
int qcom_register_ssr_notifier(struct notifier_block *nb);
void qcom_unregister_ssr_notifier(struct notifier_block *nb);
#else
static inline int qcom_register_ssr_notifier(struct notifier_block *nb)
{
return 0;
}
static inline void qcom_unregister_ssr_notifier(struct notifier_block *nb) {}
#endif
#endif
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