powercap: intel_rapl: Introduce RAPL I/F type

Different RAPL Interfaces may have different primitive information and
rapl_defaults calls.

To better distinguish this difference in the RAPL framework code,
introduce a new enum to represent different types of RAPL Interfaces.

No functional change.

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

@@ -186,7 +186,7 @@ struct rapl_defaults {
 	unsigned int psys_domain_energy_unit;
 	bool spr_psys_bits;
 };
-static struct rapl_defaults *rapl_defaults;
+static struct rapl_defaults *defaults_msr;
 
 static struct rapl_defaults *get_defaults(struct rapl_package *rp)
 {
@@ -610,7 +610,7 @@ static u64 rapl_unit_xlate(struct rapl_domain *rd, enum unit_type type,
 	return div64_u64(value, scale);
 }
 
-static struct rapl_primitive_info rpi_default[NR_RAPL_PRIMITIVES] = {
+static struct rapl_primitive_info rpi_msr[NR_RAPL_PRIMITIVES] = {
 	/* name, mask, shift, msr index, unit divisor */
 	[POWER_LIMIT1] = PRIMITIVE_INFO_INIT(POWER_LIMIT1, POWER_LIMIT1_MASK, 0,
 			    RAPL_DOMAIN_REG_LIMIT, POWER_UNIT, 0),
@@ -679,8 +679,16 @@ static struct rapl_primitive_info *get_rpi(struct rapl_package *rp, int prim)
 
 static int rapl_config(struct rapl_package *rp)
 {
-	rp->priv->defaults = (void *)rapl_defaults;
-	rp->priv->rpi = (void *)rpi_default;
+	switch (rp->priv->type) {
+	/* MMIO I/F shares the same register layout as MSR registers */
+	case RAPL_IF_MMIO:
+	case RAPL_IF_MSR:
+		rp->priv->defaults = (void *)defaults_msr;
+		rp->priv->rpi = (void *)rpi_msr;
+		break;
+	default:
+		return -EINVAL;
+	}
 	return 0;
 }
 
@@ -1546,7 +1554,7 @@ static int __init rapl_init(void)
 
 	id = x86_match_cpu(rapl_ids);
 	if (id) {
-		rapl_defaults = (struct rapl_defaults *)id->driver_data;
+		defaults_msr = (struct rapl_defaults *)id->driver_data;
 
 		rapl_msr_platdev = platform_device_alloc("intel_rapl_msr", 0);
 		if (!rapl_msr_platdev)

drivers/powercap/intel_rapl_msr.c

@@ -34,6 +34,7 @@
 static struct rapl_if_priv *rapl_msr_priv;
 
 static struct rapl_if_priv rapl_msr_priv_intel = {
+	.type = RAPL_IF_MSR,
 	.reg_unit = MSR_RAPL_POWER_UNIT,
 	.regs[RAPL_DOMAIN_PACKAGE] = {
 		MSR_PKG_POWER_LIMIT, MSR_PKG_ENERGY_STATUS, MSR_PKG_PERF_STATUS, 0, MSR_PKG_POWER_INFO },
@@ -50,6 +51,7 @@ static struct rapl_if_priv rapl_msr_priv_intel = {
 };
 
 static struct rapl_if_priv rapl_msr_priv_amd = {
+	.type = RAPL_IF_MSR,
 	.reg_unit = MSR_AMD_RAPL_POWER_UNIT,
 	.regs[RAPL_DOMAIN_PACKAGE] = {
 		0, MSR_AMD_PKG_ENERGY_STATUS, 0, 0, 0 },

drivers/thermal/intel/int340x_thermal/processor_thermal_rapl.c

@@ -97,6 +97,7 @@ int proc_thermal_rapl_add(struct pci_dev *pdev, struct proc_thermal_device *proc
 						rapl_regs->regs[domain][reg];
 		rapl_mmio_priv.limits[domain] = rapl_regs->limits[domain];
 	}
+	rapl_mmio_priv.type = RAPL_IF_MMIO;
 	rapl_mmio_priv.reg_unit = (u64)proc_priv->mmio_base + rapl_regs->reg_unit;
 
 	rapl_mmio_priv.read_raw = rapl_mmio_read_raw;

include/linux/intel_rapl.h

@@ -14,6 +14,11 @@
 #include <linux/powercap.h>
 #include <linux/cpuhotplug.h>
 
+enum rapl_if_type {
+	RAPL_IF_MSR,	/* RAPL I/F using MSR registers */
+	RAPL_IF_MMIO,	/* RAPL I/F using MMIO registers */
+};
+
 enum rapl_domain_type {
 	RAPL_DOMAIN_PACKAGE,	/* entire package/socket */
 	RAPL_DOMAIN_PP0,	/* core power plane */
@@ -130,6 +135,7 @@ struct reg_action {
  * @rpi:			internal pointer to interface primitive info
  */
 struct rapl_if_priv {
+	enum rapl_if_type type;
 	struct powercap_control_type *control_type;
 	enum cpuhp_state pcap_rapl_online;
 	u64 reg_unit;