powercap: intel_rapl: Use bitmap for Power Limits

Currently, a RAPL package is registered with the number of Power Limits
supported in each RAPL domain. But this doesn't tell which Power Limits
are available. Using the number of Power Limits supported to guess the
availability of each Power Limit is fragile.

Use bitmap to represent the availability of each Power Limit.

Note that PL1 is mandatory thus it does not need to be set explicitly by
the RAPL Interface drivers.

No functional change intended.

Signed-off-by: Zhang Rui <[email protected]>
Tested-by: Wang Wendy <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: zhang-rui

drivers/powercap/intel_rapl_common.c

@@ -574,20 +574,18 @@ static void rapl_init_domains(struct rapl_package *rp)
 				rapl_domain_names[i]);
 
 		rd->id = i;
+
+		/* PL1 is supported by default */
+		rp->priv->limits[i] |= BIT(POWER_LIMIT1);
 		rd->rpl[0].prim_id = PL1_ENABLE;
 		rd->rpl[0].name = pl1_name;
 
-		/*
-		 * The PL2 power domain is applicable for limits two
-		 * and limits three
-		 */
-		if (rp->priv->limits[i] >= 2) {
+		if (rp->priv->limits[i] & BIT(POWER_LIMIT2)) {
 			rd->rpl[1].prim_id = PL2_ENABLE;
 			rd->rpl[1].name = pl2_name;
 		}
 
-		/* Enable PL4 domain if the total power limits are three */
-		if (rp->priv->limits[i] == 3) {
+		if (rp->priv->limits[i] & BIT(POWER_LIMIT4)) {
 			rd->rpl[2].prim_id = PL4_ENABLE;
 			rd->rpl[2].name = pl4_name;
 		}
@@ -762,7 +760,7 @@ static int rapl_read_data_raw(struct rapl_domain *rd,
 	cpu = rd->rp->lead_cpu;
 
 	/* domain with 2 limits has different bit */
-	if (prim == FW_LOCK && rd->rp->priv->limits[rd->id] == 2) {
+	if (prim == FW_LOCK && (rd->rp->priv->limits[rd->id] & BIT(POWER_LIMIT2))) {
 		rpi->mask = POWER_HIGH_LOCK;
 		rpi->shift = 63;
 	}

drivers/powercap/intel_rapl_msr.c

@@ -45,8 +45,8 @@ static struct rapl_if_priv rapl_msr_priv_intel = {
 		MSR_DRAM_POWER_LIMIT, MSR_DRAM_ENERGY_STATUS, MSR_DRAM_PERF_STATUS, 0, MSR_DRAM_POWER_INFO },
 	.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,
+	.limits[RAPL_DOMAIN_PACKAGE] = BIT(POWER_LIMIT2),
+	.limits[RAPL_DOMAIN_PLATFORM] = BIT(POWER_LIMIT2),
 };
 
 static struct rapl_if_priv rapl_msr_priv_amd = {
@@ -169,7 +169,7 @@ static int rapl_msr_probe(struct platform_device *pdev)
 	rapl_msr_priv->write_raw = rapl_msr_write_raw;
 
 	if (id) {
-		rapl_msr_priv->limits[RAPL_DOMAIN_PACKAGE] = 3;
+		rapl_msr_priv->limits[RAPL_DOMAIN_PACKAGE] |= BIT(POWER_LIMIT4);
 		rapl_msr_priv->regs[RAPL_DOMAIN_PACKAGE][RAPL_DOMAIN_REG_PL4] =
 			MSR_VR_CURRENT_CONFIG;
 		pr_info("PL4 support detected.\n");

drivers/thermal/intel/int340x_thermal/processor_thermal_rapl.c

@@ -15,8 +15,8 @@ static const struct rapl_mmio_regs rapl_mmio_default = {
 	.reg_unit = 0x5938,
 	.regs[RAPL_DOMAIN_PACKAGE] = { 0x59a0, 0x593c, 0x58f0, 0, 0x5930},
 	.regs[RAPL_DOMAIN_DRAM] = { 0x58e0, 0x58e8, 0x58ec, 0, 0},
-	.limits[RAPL_DOMAIN_PACKAGE] = 2,
-	.limits[RAPL_DOMAIN_DRAM] = 2,
+	.limits[RAPL_DOMAIN_PACKAGE] = BIT(POWER_LIMIT2),
+	.limits[RAPL_DOMAIN_DRAM] = BIT(POWER_LIMIT2),
 };
 
 static int rapl_mmio_cpu_online(unsigned int cpu)