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authorBjorn Andersson <bjorn.andersson@linaro.org>2017-07-24 22:56:43 -0700
committerBjorn Andersson <bjorn.andersson@linaro.org>2017-08-02 12:43:20 -0700
commit1e140df0496541c473e5d40b0da5d2d626b2e343 (patch)
treed872019d45a5a7da0c9a9478fd6e30ec011328cb /drivers/remoteproc
parent1b0ef9068f053d8057b5ebe3cbff692b071bdf73 (diff)
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: Bjorn Andersson <bjorn.andersson@linaro.org>
Diffstat (limited to 'drivers/remoteproc')
-rw-r--r--drivers/remoteproc/qcom_adsp_pil.c6
-rw-r--r--drivers/remoteproc/qcom_common.c71
-rw-r--r--drivers/remoteproc/qcom_common.h10
-rw-r--r--drivers/remoteproc/qcom_q6v5_pil.c3
4 files changed, 90 insertions, 0 deletions
diff --git a/drivers/remoteproc/qcom_adsp_pil.c b/drivers/remoteproc/qcom_adsp_pil.c
index 49fe2f807e1d..a41d399766fd 100644
--- a/drivers/remoteproc/qcom_adsp_pil.c
+++ b/drivers/remoteproc/qcom_adsp_pil.c
@@ -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[] = {
diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c
index bb90481215c6..31b8291dfc8b 100644
--- a/drivers/remoteproc/qcom_common.c
+++ b/drivers/remoteproc/qcom_common.c
@@ -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");
diff --git a/drivers/remoteproc/qcom_common.h b/drivers/remoteproc/qcom_common.h
index db5c826d5cd4..fab28b64b8ea 100644
--- a/drivers/remoteproc/qcom_common.h
+++ b/drivers/remoteproc/qcom_common.h
@@ -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
diff --git a/drivers/remoteproc/qcom_q6v5_pil.c b/drivers/remoteproc/qcom_q6v5_pil.c
index 8fd697a3cf8f..fc3ef1e81433 100644
--- a/drivers/remoteproc/qcom_q6v5_pil.c
+++ b/drivers/remoteproc/qcom_q6v5_pil.c
@@ -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;

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