diff options
Diffstat (limited to 'drivers/powercap/intel_rapl.c')
| -rw-r--r-- | drivers/powercap/intel_rapl.c | 103 |
1 files changed, 79 insertions, 24 deletions
diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c index 91dfbe6433d6..8b4b8a376120 100644 --- a/drivers/powercap/intel_rapl.c +++ b/drivers/powercap/intel_rapl.c @@ -335,14 +335,14 @@ static int release_zone(struct powercap_zone *power_zone) static int find_nr_power_limit(struct rapl_domain *rd) { - int i; + int i, nr_pl = 0; for (i = 0; i < NR_POWER_LIMITS; i++) { - if (rd->rpl[i].name == NULL) - break; + if (rd->rpl[i].name) + nr_pl++; } - return i; + return nr_pl; } static int set_domain_enable(struct powercap_zone *power_zone, bool mode) @@ -425,15 +425,38 @@ static const struct powercap_zone_ops zone_ops[] = { }, }; -static int set_power_limit(struct powercap_zone *power_zone, int id, + +/* + * Constraint index used by powercap can be different than power limit (PL) + * index in that some PLs maybe missing due to non-existant MSRs. So we + * need to convert here by finding the valid PLs only (name populated). + */ +static int contraint_to_pl(struct rapl_domain *rd, int cid) +{ + int i, j; + + for (i = 0, j = 0; i < NR_POWER_LIMITS; i++) { + if ((rd->rpl[i].name) && j++ == cid) { + pr_debug("%s: index %d\n", __func__, i); + return i; + } + } + + return -EINVAL; +} + +static int set_power_limit(struct powercap_zone *power_zone, int cid, u64 power_limit) { struct rapl_domain *rd; struct rapl_package *rp; int ret = 0; + int id; get_online_cpus(); rd = power_zone_to_rapl_domain(power_zone); + id = contraint_to_pl(rd, cid); + rp = rd->rp; if (rd->state & DOMAIN_STATE_BIOS_LOCKED) { @@ -460,16 +483,18 @@ set_exit: return ret; } -static int get_current_power_limit(struct powercap_zone *power_zone, int id, +static int get_current_power_limit(struct powercap_zone *power_zone, int cid, u64 *data) { struct rapl_domain *rd; u64 val; int prim; int ret = 0; + int id; get_online_cpus(); rd = power_zone_to_rapl_domain(power_zone); + id = contraint_to_pl(rd, cid); switch (rd->rpl[id].prim_id) { case PL1_ENABLE: prim = POWER_LIMIT1; @@ -491,14 +516,17 @@ static int get_current_power_limit(struct powercap_zone *power_zone, int id, return ret; } -static int set_time_window(struct powercap_zone *power_zone, int id, +static int set_time_window(struct powercap_zone *power_zone, int cid, u64 window) { struct rapl_domain *rd; int ret = 0; + int id; get_online_cpus(); rd = power_zone_to_rapl_domain(power_zone); + id = contraint_to_pl(rd, cid); + switch (rd->rpl[id].prim_id) { case PL1_ENABLE: rapl_write_data_raw(rd, TIME_WINDOW1, window); @@ -513,14 +541,17 @@ static int set_time_window(struct powercap_zone *power_zone, int id, return ret; } -static int get_time_window(struct powercap_zone *power_zone, int id, u64 *data) +static int get_time_window(struct powercap_zone *power_zone, int cid, u64 *data) { struct rapl_domain *rd; u64 val; int ret = 0; + int id; get_online_cpus(); rd = power_zone_to_rapl_domain(power_zone); + id = contraint_to_pl(rd, cid); + switch (rd->rpl[id].prim_id) { case PL1_ENABLE: ret = rapl_read_data_raw(rd, TIME_WINDOW1, true, &val); @@ -539,15 +570,17 @@ static int get_time_window(struct powercap_zone *power_zone, int id, u64 *data) return ret; } -static const char *get_constraint_name(struct powercap_zone *power_zone, int id) +static const char *get_constraint_name(struct powercap_zone *power_zone, int cid) { - struct rapl_power_limit *rpl; struct rapl_domain *rd; + int id; rd = power_zone_to_rapl_domain(power_zone); - rpl = (struct rapl_power_limit *) &rd->rpl[id]; + id = contraint_to_pl(rd, cid); + if (id >= 0) + return rd->rpl[id].name; - return rpl->name; + return NULL; } @@ -1373,6 +1406,37 @@ static int rapl_check_domain(int cpu, int domain) return 0; } + +/* + * Check if power limits are available. Two cases when they are not available: + * 1. Locked by BIOS, in this case we still provide read-only access so that + * users can see what limit is set by the BIOS. + * 2. Some CPUs make some domains monitoring only which means PLx MSRs may not + * exist at all. In this case, we do not show the contraints in powercap. + * + * Called after domains are detected and initialized. + */ +static void rapl_detect_powerlimit(struct rapl_domain *rd) +{ + u64 val64; + int i; + + /* check if the domain is locked by BIOS, ignore if MSR doesn't exist */ + if (!rapl_read_data_raw(rd, FW_LOCK, false, &val64)) { + if (val64) { + pr_info("RAPL package %d domain %s locked by BIOS\n", + rd->rp->id, rd->name); + rd->state |= DOMAIN_STATE_BIOS_LOCKED; + } + } + /* check if power limit MSRs exists, otherwise domain is monitoring only */ + for (i = 0; i < NR_POWER_LIMITS; i++) { + int prim = rd->rpl[i].prim_id; + if (rapl_read_data_raw(rd, prim, false, &val64)) + rd->rpl[i].name = NULL; + } +} + /* Detect active and valid domains for the given CPU, caller must * ensure the CPU belongs to the targeted package and CPU hotlug is disabled. */ @@ -1381,7 +1445,6 @@ static int rapl_detect_domains(struct rapl_package *rp, int cpu) int i; int ret = 0; struct rapl_domain *rd; - u64 locked; for (i = 0; i < RAPL_DOMAIN_MAX; i++) { /* use physical package id to read counters */ @@ -1406,17 +1469,9 @@ static int rapl_detect_domains(struct rapl_package *rp, int cpu) } rapl_init_domains(rp); - for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) { - /* check if the domain is locked by BIOS */ - ret = rapl_read_data_raw(rd, FW_LOCK, false, &locked); - if (ret) - return ret; - if (locked) { - pr_info("RAPL package %d domain %s locked by BIOS\n", - rp->id, rd->name); - rd->state |= DOMAIN_STATE_BIOS_LOCKED; - } - } + for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) + rapl_detect_powerlimit(rd); + done: |