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firmware: arm_scmi: Check for notification support

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When registering protocol events, use the optional .is_notify_supported
callback provided by the protocol to check if that specific notification
type is available for that particular resource on the running system,
marking it as unsupported otherwise.

Then, when a notification enable request is received, return an error if
it was previously marked as unsuppported, so avoiding to send a needless
notification enable command and check the returned value for failure.

Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Link: https://lore.kernel.org/r/20240212123233.1230090-2-cristian.marussi@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi 2024-02-12 12:32:23 +00:00 committed by Sudeep Holla
parent 961745b2c4
commit 8733e86a80
2 changed files with 20 additions and 1 deletions
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17
drivers/firmware/arm_scmi/notify.c
View File

@ -99,6 +99,7 @@
#define PROTO_ID_MASK GENMASK(31, 24)
#define EVT_ID_MASK GENMASK(23, 16)
#define SRC_ID_MASK GENMASK(15, 0)
#define NOTIF_UNSUPP -1
/*
* Builds an unsigned 32bit key from the given input tuple to be used
@ -788,6 +789,7 @@ int scmi_register_protocol_events(const struct scmi_handle *handle, u8 proto_id,
pd->ph = ph;
for (i = 0; i < ee->num_events; i++, evt++) {
int id;
struct scmi_registered_event *r_evt;
r_evt = devm_kzalloc(ni->handle->dev, sizeof(*r_evt),
@ -809,6 +811,11 @@ int scmi_register_protocol_events(const struct scmi_handle *handle, u8 proto_id,
if (!r_evt->report)
return -ENOMEM;
for (id = 0; id < r_evt->num_sources; id++)
if (ee->ops->is_notify_supported &&
!ee->ops->is_notify_supported(ph, r_evt->evt->id, id))
refcount_set(&r_evt->sources[id], NOTIF_UNSUPP);
pd->registered_events[i] = r_evt;
/* Ensure events are updated */
smp_wmb();
@ -1166,7 +1173,13 @@ static inline int __scmi_enable_evt(struct scmi_registered_event *r_evt,
int ret = 0;
sid = &r_evt->sources[src_id];
if (refcount_read(sid) == 0) {
if (refcount_read(sid) == NOTIF_UNSUPP) {
dev_dbg(r_evt->proto->ph->dev,
"Notification NOT supported - proto_id:%d evt_id:%d src_id:%d",
r_evt->proto->id, r_evt->evt->id,
src_id);
ret = -EOPNOTSUPP;
} else if (refcount_read(sid) == 0) {
ret = REVT_NOTIFY_ENABLE(r_evt, r_evt->evt->id,
src_id);
if (!ret)
@ -1179,6 +1192,8 @@ static inline int __scmi_enable_evt(struct scmi_registered_event *r_evt,
} else {
for (; num_sources; src_id++, num_sources--) {
sid = &r_evt->sources[src_id];
if (refcount_read(sid) == NOTIF_UNSUPP)
continue;
if (refcount_dec_and_test(sid))
REVT_NOTIFY_DISABLE(r_evt,
r_evt->evt->id, src_id);

4
drivers/firmware/arm_scmi/notify.h
View File

@ -35,6 +35,8 @@ struct scmi_protocol_handle;
/**
* struct scmi_event_ops - Protocol helpers called by the notification core.
* @is_notify_supported: Return 0 if the specified notification for the
* specified resource (src_id) is supported.
* @get_num_sources: Returns the number of possible events' sources for this
* protocol
* @set_notify_enabled: Enable/disable the required evt_id/src_id notifications
@ -50,6 +52,8 @@ struct scmi_protocol_handle;
* process context.
*/
struct scmi_event_ops {
bool (*is_notify_supported)(const struct scmi_protocol_handle *ph,
u8 evt_id, u32 src_id);
int (*get_num_sources)(const struct scmi_protocol_handle *ph);
int (*set_notify_enabled)(const struct scmi_protocol_handle *ph,
u8 evt_id, u32 src_id, bool enabled);