powercap: Add AMD Fam17h RAPL support

Enable AMD Fam17h RAPL support for the power capping framework.

The support is as per AMD Fam17h Model31h (Zen2) and model 00-ffh
(Zen1) PPR.

Tested by comparing the results of following two sysfs entries and the
values directly read from corresponding MSRs via /dev/cpu/[x]/msr:
  /sys/class/powercap/intel-rapl/intel-rapl:0/energy_uj
  /sys/class/powercap/intel-rapl/intel-rapl:0/intel-rapl:0:0/energy_uj

Signed-off-by: Victor Ding <victording@google.com>
Acked-by: Kim Phillips <kim.phillips@amd.com>
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

arch/x86/include/asm/msr-index.h

@@ -327,6 +327,7 @@
 #define MSR_PP1_POLICY			0x00000642
 
 #define MSR_AMD_RAPL_POWER_UNIT		0xc0010299
+#define MSR_AMD_CORE_ENERGY_STATUS		0xc001029a
 #define MSR_AMD_PKG_ENERGY_STATUS	0xc001029b
 
 /* Config TDP MSRs */

drivers/powercap/intel_rapl_common.c

@@ -1011,6 +1011,10 @@ static const struct rapl_defaults rapl_defaults_cht = {
 	.compute_time_window = rapl_compute_time_window_atom,
 };
 
+static const struct rapl_defaults rapl_defaults_amd = {
+	.check_unit = rapl_check_unit_core,
+};
+
 static const struct x86_cpu_id rapl_ids[] __initconst = {
 	X86_MATCH_INTEL_FAM6_MODEL(SANDYBRIDGE,		&rapl_defaults_core),
 	X86_MATCH_INTEL_FAM6_MODEL(SANDYBRIDGE_X,	&rapl_defaults_core),
@@ -1061,6 +1065,8 @@ static const struct x86_cpu_id rapl_ids[] __initconst = {
 
 	X86_MATCH_INTEL_FAM6_MODEL(XEON_PHI_KNL,	&rapl_defaults_hsw_server),
 	X86_MATCH_INTEL_FAM6_MODEL(XEON_PHI_KNM,	&rapl_defaults_hsw_server),
+
+	X86_MATCH_VENDOR_FAM(AMD, 0x17, &rapl_defaults_amd),
 	{}
 };
 MODULE_DEVICE_TABLE(x86cpu, rapl_ids);

drivers/powercap/intel_rapl_msr.c

@@ -49,6 +49,14 @@ static struct rapl_if_priv rapl_msr_priv_intel = {
 	.limits[RAPL_DOMAIN_PLATFORM] = 2,
 };
 
+static struct rapl_if_priv rapl_msr_priv_amd = {
+	.reg_unit = MSR_AMD_RAPL_POWER_UNIT,
+	.regs[RAPL_DOMAIN_PACKAGE] = {
+		0, MSR_AMD_PKG_ENERGY_STATUS, 0, 0, 0 },
+	.regs[RAPL_DOMAIN_PP0] = {
+		0, MSR_AMD_CORE_ENERGY_STATUS, 0, 0, 0 },
+};
+
 /* Handles CPU hotplug on multi-socket systems.
  * If a CPU goes online as the first CPU of the physical package
  * we add the RAPL package to the system. Similarly, when the last
@@ -138,7 +146,17 @@ static int rapl_msr_probe(struct platform_device *pdev)
 	const struct x86_cpu_id *id = x86_match_cpu(pl4_support_ids);
 	int ret;
 
+	switch (boot_cpu_data.x86_vendor) {
+	case X86_VENDOR_INTEL:
 		rapl_msr_priv = &rapl_msr_priv_intel;
+		break;
+	case X86_VENDOR_AMD:
+		rapl_msr_priv = &rapl_msr_priv_amd;
+		break;
+	default:
+		pr_err("intel-rapl does not support CPU vendor %d\n", boot_cpu_data.x86_vendor);
+		return -ENODEV;
+	}
 	rapl_msr_priv->read_raw = rapl_msr_read_raw;
 	rapl_msr_priv->write_raw = rapl_msr_write_raw;