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powercap/intel_rapl: enumerate Psys RAPL domain together with package RAPL domain 

On multi-package systems, the Psys MSR is only valid for CPUs on
specific package (master package). The current code makes the
assumption that package 0 is the master package, but this is not
true on new platforms like SPR.

Fix the problem by emuerating the Psys RAPL domain for every
package, so CPUs in slave packages will read 0 for the Psys energy
counter and only CPUs in master packages can get a valid reading
and register the Psys RAPL domain.

The sysfs I/F for the Psys RAPL domain is not changed.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Zhang Rui 2020-10-13 15:42:41 +08:00 committed by Rafael J. Wysocki
parent 7a57e9f112
commit f1e8d7560d
3 changed files with 18 additions and 74 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

80
drivers/powercap/intel_rapl_common.c
View File

@ -544,7 +544,14 @@ static void rapl_init_domains(struct rapl_package *rp)
continue;
rd->rp = rp;
rd->name = rapl_domain_names[i];
if (i == RAPL_DOMAIN_PLATFORM && rp->id > 0) {
snprintf(rd->name, RAPL_DOMAIN_NAME_LENGTH, "psys-%d",
cpu_data(rp->lead_cpu).phys_proc_id);
} else
snprintf(rd->name, RAPL_DOMAIN_NAME_LENGTH, "%s",
rapl_domain_names[i]);
rd->id = i;
rd->rpl[0].prim_id = PL1_ENABLE;
rd->rpl[0].name = pl1_name;
@ -1112,13 +1119,17 @@ static int rapl_package_register_powercap(struct rapl_package *rp)
}
/* now register domains as children of the socket/package */
for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) {
struct powercap_zone *parent = rp->power_zone;
if (rd->id == RAPL_DOMAIN_PACKAGE)
continue;
if (rd->id == RAPL_DOMAIN_PLATFORM)
parent = NULL;
/* number of power limits per domain varies */
nr_pl = find_nr_power_limit(rd);
power_zone = powercap_register_zone(&rd->power_zone,
rp->priv->control_type,
rd->name, rp->power_zone,
rd->name, parent,
&zone_ops[rd->id], nr_pl,
&constraint_ops);
@ -1145,67 +1156,6 @@ err_cleanup:
return ret;
}
int rapl_add_platform_domain(struct rapl_if_priv *priv)
{
struct rapl_domain *rd;
struct powercap_zone *power_zone;
struct reg_action ra;
int ret;
ra.reg = priv->regs[RAPL_DOMAIN_PLATFORM][RAPL_DOMAIN_REG_STATUS];
ra.mask = ~0;
ret = priv->read_raw(0, &ra);
if (ret || !ra.value)
return -ENODEV;
ra.reg = priv->regs[RAPL_DOMAIN_PLATFORM][RAPL_DOMAIN_REG_LIMIT];
ra.mask = ~0;
ret = priv->read_raw(0, &ra);
if (ret || !ra.value)
return -ENODEV;
rd = kzalloc(sizeof(*rd), GFP_KERNEL);
if (!rd)
return -ENOMEM;
rd->name = rapl_domain_names[RAPL_DOMAIN_PLATFORM];
rd->id = RAPL_DOMAIN_PLATFORM;
rd->regs[RAPL_DOMAIN_REG_LIMIT] =
priv->regs[RAPL_DOMAIN_PLATFORM][RAPL_DOMAIN_REG_LIMIT];
rd->regs[RAPL_DOMAIN_REG_STATUS] =
priv->regs[RAPL_DOMAIN_PLATFORM][RAPL_DOMAIN_REG_STATUS];
rd->rpl[0].prim_id = PL1_ENABLE;
rd->rpl[0].name = pl1_name;
rd->rpl[1].prim_id = PL2_ENABLE;
rd->rpl[1].name = pl2_name;
rd->rp = rapl_find_package_domain(0, priv);
power_zone = powercap_register_zone(&rd->power_zone, priv->control_type,
"psys", NULL,
&zone_ops[RAPL_DOMAIN_PLATFORM],
2, &constraint_ops);
if (IS_ERR(power_zone)) {
kfree(rd);
return PTR_ERR(power_zone);
}
priv->platform_rapl_domain = rd;
return 0;
}
EXPORT_SYMBOL_GPL(rapl_add_platform_domain);
void rapl_remove_platform_domain(struct rapl_if_priv *priv)
{
if (priv->platform_rapl_domain) {
powercap_unregister_zone(priv->control_type,
&priv->platform_rapl_domain->power_zone);
kfree(priv->platform_rapl_domain);
}
}
EXPORT_SYMBOL_GPL(rapl_remove_platform_domain);
static int rapl_check_domain(int cpu, int domain, struct rapl_package *rp)
{
struct reg_action ra;
@ -1215,11 +1165,9 @@ static int rapl_check_domain(int cpu, int domain, struct rapl_package *rp)
case RAPL_DOMAIN_PP0:
case RAPL_DOMAIN_PP1:
case RAPL_DOMAIN_DRAM:
case RAPL_DOMAIN_PLATFORM:
ra.reg = rp->priv->regs[domain][RAPL_DOMAIN_REG_STATUS];
break;
case RAPL_DOMAIN_PLATFORM:
/* PSYS(PLATFORM) is not a CPU domain, so avoid printng error */
return -EINVAL;
default:
pr_err("invalid domain id %d\n", domain);
return -EINVAL;

5
drivers/powercap/intel_rapl_msr.c
View File

@ -44,6 +44,7 @@ static struct rapl_if_priv rapl_msr_priv = {
.regs[RAPL_DOMAIN_PLATFORM] = {
MSR_PLATFORM_POWER_LIMIT, MSR_PLATFORM_ENERGY_STATUS, 0, 0, 0},
.limits[RAPL_DOMAIN_PACKAGE] = 2,
.limits[RAPL_DOMAIN_PLATFORM] = 2,
};
/* Handles CPU hotplug on multi-socket systems.
@ -157,9 +158,6 @@ static int rapl_msr_probe(struct platform_device *pdev)
goto out;
rapl_msr_priv.pcap_rapl_online = ret;
/* Don't bail out if PSys is not supported */
rapl_add_platform_domain(&rapl_msr_priv);
return 0;
out:
@ -171,7 +169,6 @@ out:
static int rapl_msr_remove(struct platform_device *pdev)
{
cpuhp_remove_state(rapl_msr_priv.pcap_rapl_online);
rapl_remove_platform_domain(&rapl_msr_priv);
powercap_unregister_control_type(rapl_msr_priv.control_type);
return 0;
}

7
include/linux/intel_rapl.h
View File

@ -79,8 +79,10 @@ struct rapl_power_limit {
struct rapl_package;
#define RAPL_DOMAIN_NAME_LENGTH 16
struct rapl_domain {
const char *name;
char name[RAPL_DOMAIN_NAME_LENGTH];
enum rapl_domain_type id;
u64 regs[RAPL_DOMAIN_REG_MAX];
struct powercap_zone power_zone;
@ -152,7 +154,4 @@ struct rapl_package *rapl_find_package_domain(int cpu, struct rapl_if_priv *priv
struct rapl_package *rapl_add_package(int cpu, struct rapl_if_priv *priv);
void rapl_remove_package(struct rapl_package *rp);
int rapl_add_platform_domain(struct rapl_if_priv *priv);
void rapl_remove_platform_domain(struct rapl_if_priv *priv);
#endif /* __INTEL_RAPL_H__ */