firmware: arm_scmi: Extend perf protocol ops to get number of domains

[ Upstream commit e9090e70e618cd62ab7bf2914511e5eea31a2535 ]

Similar to other protocol ops, it's useful for an scmi module driver to get
the number of supported performance domains, hence let's make this
available by adding a new perf protocol callback. Note that, a user is
being added from subsequent changes.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20230825112633.236607-2-ulf.hansson@linaro.org
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Stable-dep-of: 8e3c98d9187e ("firmware: arm_scmi: Fix frequency truncation by promoting multiplier type")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index 30dedd6..da901c6 100644 (file)
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -423,6 +423,13 @@ scmi_perf_describe_levels_get(const struct scmi_protocol_handle *ph,
        return ret;
 }
 
+static int scmi_perf_num_domains_get(const struct scmi_protocol_handle *ph)
+{
+       struct scmi_perf_info *pi = ph->get_priv(ph);
+
+       return pi->num_domains;
+}
+
 static int scmi_perf_msg_limits_set(const struct scmi_protocol_handle *ph,
                                    u32 domain, u32 max_perf, u32 min_perf)
 {
@@ -948,6 +955,7 @@ scmi_power_scale_get(const struct scmi_protocol_handle *ph)
 }
 
 static const struct scmi_perf_proto_ops perf_proto_ops = {
+       .num_domains_get = scmi_perf_num_domains_get,
        .limits_set = scmi_perf_limits_set,
        .limits_get = scmi_perf_limits_get,
        .level_set = scmi_perf_level_set,

diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index e6fe4f7..71b39cb 100644 (file)
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -101,6 +101,7 @@ struct scmi_clk_proto_ops {
  * struct scmi_perf_proto_ops - represents the various operations provided
  *     by SCMI Performance Protocol
  *
+ * @num_domains_get: gets the number of supported performance domains
  * @limits_set: sets limits on the performance level of a domain
  * @limits_get: gets limits on the performance level of a domain
  * @level_set: sets the performance level of a domain
@@ -120,6 +121,7 @@ struct scmi_clk_proto_ops {
  *     or in some other (abstract) scale
  */
 struct scmi_perf_proto_ops {
+       int (*num_domains_get)(const struct scmi_protocol_handle *ph);
        int (*limits_set)(const struct scmi_protocol_handle *ph, u32 domain,
                          u32 max_perf, u32 min_perf);
        int (*limits_get)(const struct scmi_protocol_handle *ph, u32 domain,