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firmware: arm_scmi: Support optional system wide atomic-threshold-us

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An SCMI agent can be configured system-wide with a well-defined atomic
threshold: only SCMI synchronous command whose latency has been advertised
by the SCMI platform to be lower or equal to this configured threshold will
be considered for atomic operations, when requested and if supported by the
underlying transport at all.

Link: https://lore.kernel.org/r/20220217131234.50328-6-cristian.marussi@arm.com
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi
2022-02-17 13:12:31 +00:00
committed by Sudeep Holla
parent 0539884ccc
commit 05976c5f3b
2 changed files with 28 additions and 4 deletions
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5
include/linux/scmi_protocol.h
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@@ -619,6 +619,8 @@ struct scmi_notify_ops {
* be interested to know if they can assume SCMI
* command transactions associated to this handle will
* never sleep and act accordingly.
* An optional atomic threshold value could be returned
* where configured.
* @notify_ops: pointer to set of notifications related operations
*/
struct scmi_handle {
@@ -629,7 +631,8 @@ struct scmi_handle {
(*devm_protocol_get)(struct scmi_device *sdev, u8 proto,
struct scmi_protocol_handle **ph);
void (*devm_protocol_put)(struct scmi_device *sdev, u8 proto);
bool (*is_transport_atomic)(const struct scmi_handle *handle);
bool (*is_transport_atomic)(const struct scmi_handle *handle,
unsigned int *atomic_threshold);
const struct scmi_notify_ops *notify_ops;
};