niansa-misc/linux
1
0
Fork 0
mirror of synced 2025-03-06 20:59:54 +01:00
Code Issues Projects Releases Packages Wiki Activity

firmware: arm_scmi: Populate fastchannel info only if set operations are allowed

Browse source 
Certain SCMI performance domains may have restrictions on the set level
and/or limits operation. If the SCMI domain supports fastchannel and the
set operations are not allowed, then any attempts to fetch the fastchannel
information for set level and/or limits operation will result in the
SCMI platform returning SCMI_ERR_SUPPORT. However, since this information
about the domain is already known to the agent(OSPM here) obtained via
PERF_DOMAIN_ATTRIBUTES, the agent(OSPM) can avoid calls to the firmware
trying to fetch the fastchannel information for the same.

Add those checks and skip querying the fastchannel information from the
firmware based on the information collected during the domain enumeration
stage.

Link: https://lore.kernel.org/r/20231113143252.37160-1-sudeep.holla@arm.com
Reviewed-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Sudeep Holla 2023-11-13 14:32:52 +00:00
parent 189df98777
commit 619bc6e034
1 changed files with 17 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
drivers/firmware/arm_scmi/perf.c
View file

@ -762,29 +762,36 @@ static void scmi_perf_domain_init_fc(const struct scmi_protocol_handle *ph,
u32 domain, struct scmi_fc_info **p_fc)
{
struct scmi_fc_info *fc;
struct perf_dom_info *dom;
dom = scmi_perf_domain_lookup(ph, domain);
if (IS_ERR(dom))
return;
fc = devm_kcalloc(ph->dev, PERF_FC_MAX, sizeof(*fc), GFP_KERNEL);
if (!fc)
return;
ph->hops->fastchannel_init(ph, PERF_DESCRIBE_FASTCHANNEL,
PERF_LEVEL_SET, 4, domain,
&fc[PERF_FC_LEVEL].set_addr,
&fc[PERF_FC_LEVEL].set_db);
ph->hops->fastchannel_init(ph, PERF_DESCRIBE_FASTCHANNEL,
PERF_LEVEL_GET, 4, domain,
&fc[PERF_FC_LEVEL].get_addr, NULL);
ph->hops->fastchannel_init(ph, PERF_DESCRIBE_FASTCHANNEL,
PERF_LIMITS_SET, 8, domain,
&fc[PERF_FC_LIMIT].set_addr,
&fc[PERF_FC_LIMIT].set_db);
ph->hops->fastchannel_init(ph, PERF_DESCRIBE_FASTCHANNEL,
PERF_LIMITS_GET, 8, domain,
&fc[PERF_FC_LIMIT].get_addr, NULL);
if (dom->info.set_perf)
ph->hops->fastchannel_init(ph, PERF_DESCRIBE_FASTCHANNEL,
PERF_LEVEL_SET, 4, domain,
&fc[PERF_FC_LEVEL].set_addr,
&fc[PERF_FC_LEVEL].set_db);
if (dom->set_limits)
ph->hops->fastchannel_init(ph, PERF_DESCRIBE_FASTCHANNEL,
PERF_LIMITS_SET, 8, domain,
&fc[PERF_FC_LIMIT].set_addr,
&fc[PERF_FC_LIMIT].set_db);
*p_fc = fc;
}