[PATCH 00/13] intel_rapl: RAPL abstraction and MMIO RAPL support

[PATCH 00/13] intel_rapl: RAPL abstraction and MMIO RAPL support

[Zhang Rui]

Besideis MSR interface, RAPL can also be controlled via the MMIO interface,
by accessing the MCHBar registers exposed by the processor thermal device.

Currently, we only have RAPL MSR interface in Linux kernel, this brings
problems on some platforms that BIOS performs a low power limits via the
MMIO interface by default. This results in poor system performance,
and there is no way for us to change the MMIO MSR setting in Linux.

To fix this, RAPL MMIO interface support is introduced in this patch set.

Patch 1/13 to patch 11/13 abstract the RAPL code, and move all the shared
code into a separate file, intel_rapl_common.c, so that it can be used
by both MSR and MMIO interfaces.
Patch 12/13 introduced RAPL support via MMIO registers, exposed by the
processor thermal devices.
Patch 13/13 fixes a module autoloading issue found later.

The patch series has been tested on Dell XPS 9360, a SKL platform.

Note that this patch series are based on the -tip tree, which contains the
latest RAPL changes for multi-die support.

thanks,
rui

[PATCH 01/13] intel_rapl: use reg instead of msr

[Zhang Rui]

To support both MSR and MMIO Interface, use 'reg' to discribe RAPL
registers instead of 'msr'.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
 drivers/powercap/intel_rapl.c | 98 +++++++++++++++++++++----------------------
 1 file changed, 49 insertions(+), 49 deletions(-)

diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index 8692f6b..45d5f22 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -83,13 +83,13 @@ enum rapl_domain_type {
 	RAPL_DOMAIN_MAX,
 };
 
-enum rapl_domain_msr_id {
-	RAPL_DOMAIN_MSR_LIMIT,
-	RAPL_DOMAIN_MSR_STATUS,
-	RAPL_DOMAIN_MSR_PERF,
-	RAPL_DOMAIN_MSR_POLICY,
-	RAPL_DOMAIN_MSR_INFO,
-	RAPL_DOMAIN_MSR_MAX,
+enum rapl_domain_reg_id {
+	RAPL_DOMAIN_REG_LIMIT,
+	RAPL_DOMAIN_REG_STATUS,
+	RAPL_DOMAIN_REG_PERF,
+	RAPL_DOMAIN_REG_POLICY,
+	RAPL_DOMAIN_REG_INFO,
+	RAPL_DOMAIN_REG_MAX,
 };
 
 /* per domain data, some are optional */
@@ -154,7 +154,7 @@ struct rapl_package;
 struct rapl_domain {
 	const char *name;
 	enum rapl_domain_type id;
-	int msrs[RAPL_DOMAIN_MSR_MAX];
+	int regs[RAPL_DOMAIN_REG_MAX];
 	struct powercap_zone power_zone;
 	struct rapl_domain_data rdd;
 	struct rapl_power_limit rpl[NR_POWER_LIMITS];
@@ -216,7 +216,7 @@ struct rapl_primitive_info {
 	const char *name;
 	u64 mask;
 	int shift;
-	enum rapl_domain_msr_id id;
+	enum rapl_domain_reg_id id;
 	enum unit_type unit;
 	u32 flag;
 };
@@ -642,11 +642,11 @@ static void rapl_init_domains(struct rapl_package *rp)
 		case BIT(RAPL_DOMAIN_PACKAGE):
 			rd->name = rapl_domain_names[RAPL_DOMAIN_PACKAGE];
 			rd->id = RAPL_DOMAIN_PACKAGE;
-			rd->msrs[0] = MSR_PKG_POWER_LIMIT;
-			rd->msrs[1] = MSR_PKG_ENERGY_STATUS;
-			rd->msrs[2] = MSR_PKG_PERF_STATUS;
-			rd->msrs[3] = 0;
-			rd->msrs[4] = MSR_PKG_POWER_INFO;
+			rd->regs[0] = MSR_PKG_POWER_LIMIT;
+			rd->regs[1] = MSR_PKG_ENERGY_STATUS;
+			rd->regs[2] = MSR_PKG_PERF_STATUS;
+			rd->regs[3] = 0;
+			rd->regs[4] = MSR_PKG_POWER_INFO;
 			rd->rpl[0].prim_id = PL1_ENABLE;
 			rd->rpl[0].name = pl1_name;
 			rd->rpl[1].prim_id = PL2_ENABLE;
@@ -655,33 +655,33 @@ static void rapl_init_domains(struct rapl_package *rp)
 		case BIT(RAPL_DOMAIN_PP0):
 			rd->name = rapl_domain_names[RAPL_DOMAIN_PP0];
 			rd->id = RAPL_DOMAIN_PP0;
-			rd->msrs[0] = MSR_PP0_POWER_LIMIT;
-			rd->msrs[1] = MSR_PP0_ENERGY_STATUS;
-			rd->msrs[2] = 0;
-			rd->msrs[3] = MSR_PP0_POLICY;
-			rd->msrs[4] = 0;
+			rd->regs[0] = MSR_PP0_POWER_LIMIT;
+			rd->regs[1] = MSR_PP0_ENERGY_STATUS;
+			rd->regs[2] = 0;
+			rd->regs[3] = MSR_PP0_POLICY;
+			rd->regs[4] = 0;
 			rd->rpl[0].prim_id = PL1_ENABLE;
 			rd->rpl[0].name = pl1_name;
 			break;
 		case BIT(RAPL_DOMAIN_PP1):
 			rd->name = rapl_domain_names[RAPL_DOMAIN_PP1];
 			rd->id = RAPL_DOMAIN_PP1;
-			rd->msrs[0] = MSR_PP1_POWER_LIMIT;
-			rd->msrs[1] = MSR_PP1_ENERGY_STATUS;
-			rd->msrs[2] = 0;
-			rd->msrs[3] = MSR_PP1_POLICY;
-			rd->msrs[4] = 0;
+			rd->regs[0] = MSR_PP1_POWER_LIMIT;
+			rd->regs[1] = MSR_PP1_ENERGY_STATUS;
+			rd->regs[2] = 0;
+			rd->regs[3] = MSR_PP1_POLICY;
+			rd->regs[4] = 0;
 			rd->rpl[0].prim_id = PL1_ENABLE;
 			rd->rpl[0].name = pl1_name;
 			break;
 		case BIT(RAPL_DOMAIN_DRAM):
 			rd->name = rapl_domain_names[RAPL_DOMAIN_DRAM];
 			rd->id = RAPL_DOMAIN_DRAM;
-			rd->msrs[0] = MSR_DRAM_POWER_LIMIT;
-			rd->msrs[1] = MSR_DRAM_ENERGY_STATUS;
-			rd->msrs[2] = MSR_DRAM_PERF_STATUS;
-			rd->msrs[3] = 0;
-			rd->msrs[4] = MSR_DRAM_POWER_INFO;
+			rd->regs[0] = MSR_DRAM_POWER_LIMIT;
+			rd->regs[1] = MSR_DRAM_ENERGY_STATUS;
+			rd->regs[2] = MSR_DRAM_PERF_STATUS;
+			rd->regs[3] = 0;
+			rd->regs[4] = MSR_DRAM_POWER_INFO;
 			rd->rpl[0].prim_id = PL1_ENABLE;
 			rd->rpl[0].name = pl1_name;
 			rd->domain_energy_unit =
@@ -736,37 +736,37 @@ static u64 rapl_unit_xlate(struct rapl_domain *rd, enum unit_type type,
 static struct rapl_primitive_info rpi[] = {
 	/* name, mask, shift, msr index, unit divisor */
 	PRIMITIVE_INFO_INIT(ENERGY_COUNTER, ENERGY_STATUS_MASK, 0,
-				RAPL_DOMAIN_MSR_STATUS, ENERGY_UNIT, 0),
+				RAPL_DOMAIN_REG_STATUS, ENERGY_UNIT, 0),
 	PRIMITIVE_INFO_INIT(POWER_LIMIT1, POWER_LIMIT1_MASK, 0,
-				RAPL_DOMAIN_MSR_LIMIT, POWER_UNIT, 0),
+				RAPL_DOMAIN_REG_LIMIT, POWER_UNIT, 0),
 	PRIMITIVE_INFO_INIT(POWER_LIMIT2, POWER_LIMIT2_MASK, 32,
-				RAPL_DOMAIN_MSR_LIMIT, POWER_UNIT, 0),
+				RAPL_DOMAIN_REG_LIMIT, POWER_UNIT, 0),
 	PRIMITIVE_INFO_INIT(FW_LOCK, POWER_PP_LOCK, 31,
-				RAPL_DOMAIN_MSR_LIMIT, ARBITRARY_UNIT, 0),
+				RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
 	PRIMITIVE_INFO_INIT(PL1_ENABLE, POWER_LIMIT1_ENABLE, 15,
-				RAPL_DOMAIN_MSR_LIMIT, ARBITRARY_UNIT, 0),
+				RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
 	PRIMITIVE_INFO_INIT(PL1_CLAMP, POWER_LIMIT1_CLAMP, 16,
-				RAPL_DOMAIN_MSR_LIMIT, ARBITRARY_UNIT, 0),
+				RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
 	PRIMITIVE_INFO_INIT(PL2_ENABLE, POWER_LIMIT2_ENABLE, 47,
-				RAPL_DOMAIN_MSR_LIMIT, ARBITRARY_UNIT, 0),
+				RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
 	PRIMITIVE_INFO_INIT(PL2_CLAMP, POWER_LIMIT2_CLAMP, 48,
-				RAPL_DOMAIN_MSR_LIMIT, ARBITRARY_UNIT, 0),
+				RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
 	PRIMITIVE_INFO_INIT(TIME_WINDOW1, TIME_WINDOW1_MASK, 17,
-				RAPL_DOMAIN_MSR_LIMIT, TIME_UNIT, 0),
+				RAPL_DOMAIN_REG_LIMIT, TIME_UNIT, 0),
 	PRIMITIVE_INFO_INIT(TIME_WINDOW2, TIME_WINDOW2_MASK, 49,
-				RAPL_DOMAIN_MSR_LIMIT, TIME_UNIT, 0),
+				RAPL_DOMAIN_REG_LIMIT, TIME_UNIT, 0),
 	PRIMITIVE_INFO_INIT(THERMAL_SPEC_POWER, POWER_INFO_THERMAL_SPEC_MASK,
-				0, RAPL_DOMAIN_MSR_INFO, POWER_UNIT, 0),
+				0, RAPL_DOMAIN_REG_INFO, POWER_UNIT, 0),
 	PRIMITIVE_INFO_INIT(MAX_POWER, POWER_INFO_MAX_MASK, 32,
-				RAPL_DOMAIN_MSR_INFO, POWER_UNIT, 0),
+				RAPL_DOMAIN_REG_INFO, POWER_UNIT, 0),
 	PRIMITIVE_INFO_INIT(MIN_POWER, POWER_INFO_MIN_MASK, 16,
-				RAPL_DOMAIN_MSR_INFO, POWER_UNIT, 0),
+				RAPL_DOMAIN_REG_INFO, POWER_UNIT, 0),
 	PRIMITIVE_INFO_INIT(MAX_TIME_WINDOW, POWER_INFO_MAX_TIME_WIN_MASK, 48,
-				RAPL_DOMAIN_MSR_INFO, TIME_UNIT, 0),
+				RAPL_DOMAIN_REG_INFO, TIME_UNIT, 0),
 	PRIMITIVE_INFO_INIT(THROTTLED_TIME, PERF_STATUS_THROTTLE_TIME_MASK, 0,
-				RAPL_DOMAIN_MSR_PERF, TIME_UNIT, 0),
+				RAPL_DOMAIN_REG_PERF, TIME_UNIT, 0),
 	PRIMITIVE_INFO_INIT(PRIORITY_LEVEL, PP_POLICY_MASK, 0,
-				RAPL_DOMAIN_MSR_POLICY, ARBITRARY_UNIT, 0),
+				RAPL_DOMAIN_REG_POLICY, ARBITRARY_UNIT, 0),
 	/* non-hardware */
 	PRIMITIVE_INFO_INIT(AVERAGE_POWER, 0, 0, 0, POWER_UNIT,
 				RAPL_PRIMITIVE_DERIVED),
@@ -798,7 +798,7 @@ static int rapl_read_data_raw(struct rapl_domain *rd,
 	if (!rp->name || rp->flag & RAPL_PRIMITIVE_DUMMY)
 		return -EINVAL;
 
-	msr = rd->msrs[rp->id];
+	msr = rd->regs[rp->id];
 	if (!msr)
 		return -EINVAL;
 
@@ -874,7 +874,7 @@ static int rapl_write_data_raw(struct rapl_domain *rd,
 
 	memset(&ma, 0, sizeof(ma));
 
-	ma.msr_no = rd->msrs[rp->id];
+	ma.msr_no = rd->regs[rp->id];
 	ma.clear_mask = rp->mask;
 	ma.set_mask = bits;
 
@@ -1282,8 +1282,8 @@ static int __init rapl_register_psys(void)
 
 	rd->name = rapl_domain_names[RAPL_DOMAIN_PLATFORM];
 	rd->id = RAPL_DOMAIN_PLATFORM;
-	rd->msrs[0] = MSR_PLATFORM_POWER_LIMIT;
-	rd->msrs[1] = MSR_PLATFORM_ENERGY_STATUS;
+	rd->regs[0] = MSR_PLATFORM_POWER_LIMIT;
+	rd->regs[1] = MSR_PLATFORM_ENERGY_STATUS;
 	rd->rpl[0].prim_id = PL1_ENABLE;
 	rd->rpl[0].name = pl1_name;
 	rd->rpl[1].prim_id = PL2_ENABLE;
-- 
2.7.4

[PATCH 02/13] intel_rapl: remove hardcoded register index

[Zhang Rui]

enum rapl_domain_reg_id is defined for the RAPL registers for each RAPL
domain, thus use it whenever possible.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
 drivers/powercap/intel_rapl.c | 44 +++++++++++++++++++++----------------------
 1 file changed, 22 insertions(+), 22 deletions(-)

diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index 45d5f22..9be9f20 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -642,11 +642,11 @@ static void rapl_init_domains(struct rapl_package *rp)
 		case BIT(RAPL_DOMAIN_PACKAGE):
 			rd->name = rapl_domain_names[RAPL_DOMAIN_PACKAGE];
 			rd->id = RAPL_DOMAIN_PACKAGE;
-			rd->regs[0] = MSR_PKG_POWER_LIMIT;
-			rd->regs[1] = MSR_PKG_ENERGY_STATUS;
-			rd->regs[2] = MSR_PKG_PERF_STATUS;
-			rd->regs[3] = 0;
-			rd->regs[4] = MSR_PKG_POWER_INFO;
+			rd->regs[RAPL_DOMAIN_REG_LIMIT] = MSR_PKG_POWER_LIMIT;
+			rd->regs[RAPL_DOMAIN_REG_STATUS] = MSR_PKG_ENERGY_STATUS;
+			rd->regs[RAPL_DOMAIN_REG_PERF] = MSR_PKG_PERF_STATUS;
+			rd->regs[RAPL_DOMAIN_REG_POLICY] = 0;
+			rd->regs[RAPL_DOMAIN_REG_INFO] = MSR_PKG_POWER_INFO;
 			rd->rpl[0].prim_id = PL1_ENABLE;
 			rd->rpl[0].name = pl1_name;
 			rd->rpl[1].prim_id = PL2_ENABLE;
@@ -655,33 +655,33 @@ static void rapl_init_domains(struct rapl_package *rp)
 		case BIT(RAPL_DOMAIN_PP0):
 			rd->name = rapl_domain_names[RAPL_DOMAIN_PP0];
 			rd->id = RAPL_DOMAIN_PP0;
-			rd->regs[0] = MSR_PP0_POWER_LIMIT;
-			rd->regs[1] = MSR_PP0_ENERGY_STATUS;
-			rd->regs[2] = 0;
-			rd->regs[3] = MSR_PP0_POLICY;
-			rd->regs[4] = 0;
+			rd->regs[RAPL_DOMAIN_REG_LIMIT] = MSR_PP0_POWER_LIMIT;
+			rd->regs[RAPL_DOMAIN_REG_STATUS] = MSR_PP0_ENERGY_STATUS;
+			rd->regs[RAPL_DOMAIN_REG_PERF] = 0;
+			rd->regs[RAPL_DOMAIN_REG_POLICY] = MSR_PP0_POLICY;
+			rd->regs[RAPL_DOMAIN_REG_INFO] = 0;
 			rd->rpl[0].prim_id = PL1_ENABLE;
 			rd->rpl[0].name = pl1_name;
 			break;
 		case BIT(RAPL_DOMAIN_PP1):
 			rd->name = rapl_domain_names[RAPL_DOMAIN_PP1];
 			rd->id = RAPL_DOMAIN_PP1;
-			rd->regs[0] = MSR_PP1_POWER_LIMIT;
-			rd->regs[1] = MSR_PP1_ENERGY_STATUS;
-			rd->regs[2] = 0;
-			rd->regs[3] = MSR_PP1_POLICY;
-			rd->regs[4] = 0;
+			rd->regs[RAPL_DOMAIN_REG_LIMIT] = MSR_PP1_POWER_LIMIT;
+			rd->regs[RAPL_DOMAIN_REG_STATUS] = MSR_PP1_ENERGY_STATUS;
+			rd->regs[RAPL_DOMAIN_REG_PERF] = 0;
+			rd->regs[RAPL_DOMAIN_REG_POLICY] = MSR_PP1_POLICY;
+			rd->regs[RAPL_DOMAIN_REG_INFO] = 0;
 			rd->rpl[0].prim_id = PL1_ENABLE;
 			rd->rpl[0].name = pl1_name;
 			break;
 		case BIT(RAPL_DOMAIN_DRAM):
 			rd->name = rapl_domain_names[RAPL_DOMAIN_DRAM];
 			rd->id = RAPL_DOMAIN_DRAM;
-			rd->regs[0] = MSR_DRAM_POWER_LIMIT;
-			rd->regs[1] = MSR_DRAM_ENERGY_STATUS;
-			rd->regs[2] = MSR_DRAM_PERF_STATUS;
-			rd->regs[3] = 0;
-			rd->regs[4] = MSR_DRAM_POWER_INFO;
+			rd->regs[RAPL_DOMAIN_REG_LIMIT] = MSR_DRAM_POWER_LIMIT;
+			rd->regs[RAPL_DOMAIN_REG_STATUS] = MSR_DRAM_ENERGY_STATUS;
+			rd->regs[RAPL_DOMAIN_REG_PERF] = MSR_DRAM_PERF_STATUS;
+			rd->regs[RAPL_DOMAIN_REG_POLICY] = 0;
+			rd->regs[RAPL_DOMAIN_REG_INFO] = MSR_DRAM_POWER_INFO;
 			rd->rpl[0].prim_id = PL1_ENABLE;
 			rd->rpl[0].name = pl1_name;
 			rd->domain_energy_unit =
@@ -1282,8 +1282,8 @@ static int __init rapl_register_psys(void)
 
 	rd->name = rapl_domain_names[RAPL_DOMAIN_PLATFORM];
 	rd->id = RAPL_DOMAIN_PLATFORM;
-	rd->regs[0] = MSR_PLATFORM_POWER_LIMIT;
-	rd->regs[1] = MSR_PLATFORM_ENERGY_STATUS;
+	rd->regs[RAPL_DOMAIN_REG_LIMIT] = MSR_PLATFORM_POWER_LIMIT;
+	rd->regs[RAPL_DOMAIN_REG_STATUS] = MSR_PLATFORM_ENERGY_STATUS;
 	rd->rpl[0].prim_id = PL1_ENABLE;
 	rd->rpl[0].name = pl1_name;
 	rd->rpl[1].prim_id = PL2_ENABLE;
-- 
2.7.4

[PATCH 03/13] intel_rapl: introduce intel_rapl.h

[Zhang Rui]

Create a new header file for the common definitions that might be used
by different RAPL Interface.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
 MAINTAINERS                   |   1 +
 drivers/powercap/intel_rapl.c | 101 +------------------------------------
 include/linux/intel_rapl.h    | 113 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 116 insertions(+), 99 deletions(-)
 create mode 100644 include/linux/intel_rapl.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 57f496c..b51f2b5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12601,6 +12601,7 @@ F:	drivers/base/power/
 F:	include/linux/pm.h
 F:	include/linux/pm_*
 F:	include/linux/powercap.h
+F:	include/linux/intel_rapl.h
 F:	drivers/powercap/
 F:	kernel/configs/nopm.config
 
diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index 9be9f20..adb35ec 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -18,8 +18,9 @@
 #include <linux/cpu.h>
 #include <linux/powercap.h>
 #include <linux/suspend.h>
-#include <asm/iosf_mbi.h>
+#include <linux/intel_rapl.h>
 
+#include <asm/iosf_mbi.h>
 #include <asm/processor.h>
 #include <asm/cpu_device_id.h>
 #include <asm/intel-family.h>
@@ -74,59 +75,9 @@ enum unit_type {
 	TIME_UNIT,
 };
 
-enum rapl_domain_type {
-	RAPL_DOMAIN_PACKAGE, /* entire package/socket */
-	RAPL_DOMAIN_PP0, /* core power plane */
-	RAPL_DOMAIN_PP1, /* graphics uncore */
-	RAPL_DOMAIN_DRAM,/* DRAM control_type */
-	RAPL_DOMAIN_PLATFORM, /* PSys control_type */
-	RAPL_DOMAIN_MAX,
-};
-
-enum rapl_domain_reg_id {
-	RAPL_DOMAIN_REG_LIMIT,
-	RAPL_DOMAIN_REG_STATUS,
-	RAPL_DOMAIN_REG_PERF,
-	RAPL_DOMAIN_REG_POLICY,
-	RAPL_DOMAIN_REG_INFO,
-	RAPL_DOMAIN_REG_MAX,
-};
-
 /* per domain data, some are optional */
-enum rapl_primitives {
-	ENERGY_COUNTER,
-	POWER_LIMIT1,
-	POWER_LIMIT2,
-	FW_LOCK,
-
-	PL1_ENABLE,  /* power limit 1, aka long term */
-	PL1_CLAMP,   /* allow frequency to go below OS request */
-	PL2_ENABLE,  /* power limit 2, aka short term, instantaneous */
-	PL2_CLAMP,
-
-	TIME_WINDOW1, /* long term */
-	TIME_WINDOW2, /* short term */
-	THERMAL_SPEC_POWER,
-	MAX_POWER,
-
-	MIN_POWER,
-	MAX_TIME_WINDOW,
-	THROTTLED_TIME,
-	PRIORITY_LEVEL,
-
-	/* below are not raw primitive data */
-	AVERAGE_POWER,
-	NR_RAPL_PRIMITIVES,
-};
-
 #define NR_RAW_PRIMITIVES (NR_RAPL_PRIMITIVES - 2)
 
-/* Can be expanded to include events, etc.*/
-struct rapl_domain_data {
-	u64 primitives[NR_RAPL_PRIMITIVES];
-	unsigned long timestamp;
-};
-
 struct msrl_action {
 	u32 msr_no;
 	u64 clear_mask;
@@ -138,60 +89,12 @@ struct msrl_action {
 #define	DOMAIN_STATE_POWER_LIMIT_SET    BIT(1)
 #define DOMAIN_STATE_BIOS_LOCKED        BIT(2)
 
-#define NR_POWER_LIMITS (2)
-struct rapl_power_limit {
-	struct powercap_zone_constraint *constraint;
-	int prim_id; /* primitive ID used to enable */
-	struct rapl_domain *domain;
-	const char *name;
-	u64 last_power_limit;
-};
-
 static const char pl1_name[] = "long_term";
 static const char pl2_name[] = "short_term";
 
-struct rapl_package;
-struct rapl_domain {
-	const char *name;
-	enum rapl_domain_type id;
-	int regs[RAPL_DOMAIN_REG_MAX];
-	struct powercap_zone power_zone;
-	struct rapl_domain_data rdd;
-	struct rapl_power_limit rpl[NR_POWER_LIMITS];
-	u64 attr_map; /* track capabilities */
-	unsigned int state;
-	unsigned int domain_energy_unit;
-	struct rapl_package *rp;
-};
 #define power_zone_to_rapl_domain(_zone) \
 	container_of(_zone, struct rapl_domain, power_zone)
 
-/* maximum rapl package domain name: package-%d-die-%d */
-#define PACKAGE_DOMAIN_NAME_LENGTH 30
-
-
-/* Each rapl package contains multiple domains, these are the common
- * data across RAPL domains within a package.
- */
-struct rapl_package {
-	unsigned int id; /* logical die id, equals physical 1-die systems */
-	unsigned int nr_domains;
-	unsigned long domain_map; /* bit map of active domains */
-	unsigned int power_unit;
-	unsigned int energy_unit;
-	unsigned int time_unit;
-	struct rapl_domain *domains; /* array of domains, sized at runtime */
-	struct powercap_zone *power_zone; /* keep track of parent zone */
-	unsigned long power_limit_irq; /* keep track of package power limit
-					* notify interrupt enable status.
-					*/
-	struct list_head plist;
-	int lead_cpu; /* one active cpu per package for access */
-	/* Track active cpus */
-	struct cpumask cpumask;
-	char name[PACKAGE_DOMAIN_NAME_LENGTH];
-};
-
 struct rapl_defaults {
 	u8 floor_freq_reg_addr;
 	int (*check_unit)(struct rapl_package *rp, int cpu);
diff --git a/include/linux/intel_rapl.h b/include/linux/intel_rapl.h
new file mode 100644
index 0000000..9471603
--- /dev/null
+++ b/include/linux/intel_rapl.h
@@ -0,0 +1,113 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  Data types and headers for RAPL support
+ *
+ *  Copyright (C) 2019  Intel Corporation.
+ *
+ *  Author: Zhang Rui <rui.zhang@intel.com>
+ */
+
+#ifndef __INTEL_RAPL_H__
+#define __INTEL_RAPL_H__
+
+#include <linux/types.h>
+#include <linux/powercap.h>
+
+enum rapl_domain_type {
+	RAPL_DOMAIN_PACKAGE,	/* entire package/socket */
+	RAPL_DOMAIN_PP0,	/* core power plane */
+	RAPL_DOMAIN_PP1,	/* graphics uncore */
+	RAPL_DOMAIN_DRAM,	/* DRAM control_type */
+	RAPL_DOMAIN_PLATFORM,	/* PSys control_type */
+	RAPL_DOMAIN_MAX,
+};
+
+enum rapl_domain_reg_id {
+	RAPL_DOMAIN_REG_LIMIT,
+	RAPL_DOMAIN_REG_STATUS,
+	RAPL_DOMAIN_REG_PERF,
+	RAPL_DOMAIN_REG_POLICY,
+	RAPL_DOMAIN_REG_INFO,
+	RAPL_DOMAIN_REG_MAX,
+};
+
+struct rapl_package;
+
+enum rapl_primitives {
+	ENERGY_COUNTER,
+	POWER_LIMIT1,
+	POWER_LIMIT2,
+	FW_LOCK,
+
+	PL1_ENABLE,		/* power limit 1, aka long term */
+	PL1_CLAMP,		/* allow frequency to go below OS request */
+	PL2_ENABLE,		/* power limit 2, aka short term, instantaneous */
+	PL2_CLAMP,
+
+	TIME_WINDOW1,		/* long term */
+	TIME_WINDOW2,		/* short term */
+	THERMAL_SPEC_POWER,
+	MAX_POWER,
+
+	MIN_POWER,
+	MAX_TIME_WINDOW,
+	THROTTLED_TIME,
+	PRIORITY_LEVEL,
+
+	/* below are not raw primitive data */
+	AVERAGE_POWER,
+	NR_RAPL_PRIMITIVES,
+};
+
+struct rapl_domain_data {
+	u64 primitives[NR_RAPL_PRIMITIVES];
+	unsigned long timestamp;
+};
+
+#define NR_POWER_LIMITS (2)
+struct rapl_power_limit {
+	struct powercap_zone_constraint *constraint;
+	int prim_id;		/* primitive ID used to enable */
+	struct rapl_domain *domain;
+	const char *name;
+	u64 last_power_limit;
+};
+
+struct rapl_package;
+
+struct rapl_domain {
+	const char *name;
+	enum rapl_domain_type id;
+	int regs[RAPL_DOMAIN_REG_MAX];
+	struct powercap_zone power_zone;
+	struct rapl_domain_data rdd;
+	struct rapl_power_limit rpl[NR_POWER_LIMITS];
+	u64 attr_map;		/* track capabilities */
+	unsigned int state;
+	unsigned int domain_energy_unit;
+	struct rapl_package *rp;
+};
+
+/* maximum rapl package domain name: package-%d-die-%d */
+#define PACKAGE_DOMAIN_NAME_LENGTH 30
+
+struct rapl_package {
+	unsigned int id;	/* logical die id, equals physical 1-die systems */
+	unsigned int nr_domains;
+	unsigned long domain_map;	/* bit map of active domains */
+	unsigned int power_unit;
+	unsigned int energy_unit;
+	unsigned int time_unit;
+	struct rapl_domain *domains;	/* array of domains, sized at runtime */
+	struct powercap_zone *power_zone;	/* keep track of parent zone */
+	unsigned long power_limit_irq;	/* keep track of package power limit
+					 * notify interrupt enable status.
+					 */
+	struct list_head plist;
+	int lead_cpu;		/* one active cpu per package for access */
+	/* Track active cpus */
+	struct cpumask cpumask;
+	char name[PACKAGE_DOMAIN_NAME_LENGTH];
+};
+
+#endif /* __INTEL_RAPL_H__ */
-- 
2.7.4

[PATCH 04/13] intel_rapl: introduce struct rapl_private

[Zhang Rui]

Introduce a new structure, rapl_private, to save the private data
for different RAPL Interface.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
 drivers/powercap/intel_rapl.c | 58 +++++++++++++++++++++----------------------
 include/linux/intel_rapl.h    |  7 ++++++
 2 files changed, 35 insertions(+), 30 deletions(-)

diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index adb35ec..a804370 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -75,6 +75,8 @@ enum unit_type {
 	TIME_UNIT,
 };
 
+static struct rapl_priv rapl_msr_priv;
+
 /* per domain data, some are optional */
 #define NR_RAW_PRIMITIVES (NR_RAPL_PRIMITIVES - 2)
 
@@ -155,17 +157,14 @@ static const char * const rapl_domain_names[] = {
 	"psys",
 };
 
-static struct powercap_control_type *control_type; /* PowerCap Controller */
-static struct rapl_domain *platform_rapl_domain; /* Platform (PSys) domain */
-
 /* caller to ensure CPU hotplug lock is held */
-static struct rapl_package *rapl_find_package_domain(int cpu)
+static struct rapl_package *rapl_find_package_domain(int cpu, struct rapl_priv *priv)
 {
 	int id = topology_logical_die_id(cpu);
 	struct rapl_package *rp;
 
 	list_for_each_entry(rp, &rapl_packages, plist) {
-		if (rp->id == id)
+		if (rp->id == id && rp->priv->control_type == priv->control_type)
 			return rp;
 	}
 
@@ -1090,12 +1089,12 @@ static void rapl_update_domain_data(struct rapl_package *rp)
 
 static void rapl_unregister_powercap(void)
 {
-	if (platform_rapl_domain) {
-		powercap_unregister_zone(control_type,
-					 &platform_rapl_domain->power_zone);
-		kfree(platform_rapl_domain);
+	if (&rapl_msr_priv.platform_rapl_domain) {
+		powercap_unregister_zone(rapl_msr_priv.control_type,
+					 &rapl_msr_priv.platform_rapl_domain->power_zone);
+		kfree(rapl_msr_priv.platform_rapl_domain);
 	}
-	powercap_unregister_control_type(control_type);
+	powercap_unregister_control_type(rapl_msr_priv.control_type);
 }
 
 static int rapl_package_register_powercap(struct rapl_package *rp)
@@ -1113,7 +1112,7 @@ static int rapl_package_register_powercap(struct rapl_package *rp)
 			nr_pl = find_nr_power_limit(rd);
 			pr_debug("register package domain %s\n", rp->name);
 			power_zone = powercap_register_zone(&rd->power_zone,
-							control_type,
+							rp->priv->control_type,
 							rp->name, NULL,
 							&zone_ops[rd->id],
 							nr_pl,
@@ -1140,7 +1139,7 @@ static int rapl_package_register_powercap(struct rapl_package *rp)
 		/* number of power limits per domain varies */
 		nr_pl = find_nr_power_limit(rd);
 		power_zone = powercap_register_zone(&rd->power_zone,
-						control_type, rd->name,
+						rp->priv->control_type, rd->name,
 						rp->power_zone,
 						&zone_ops[rd->id], nr_pl,
 						&constraint_ops);
@@ -1161,7 +1160,7 @@ static int rapl_package_register_powercap(struct rapl_package *rp)
 	 */
 	while (--rd >= rp->domains) {
 		pr_debug("unregister %s domain %s\n", rp->name, rd->name);
-		powercap_unregister_zone(control_type, &rd->power_zone);
+		powercap_unregister_zone(rp->priv->control_type, &rd->power_zone);
 	}
 
 	return ret;
@@ -1191,9 +1190,9 @@ static int __init rapl_register_psys(void)
 	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);
+	rd->rp = rapl_find_package_domain(0, &rapl_msr_priv);
 
-	power_zone = powercap_register_zone(&rd->power_zone, control_type,
+	power_zone = powercap_register_zone(&rd->power_zone, rapl_msr_priv.control_type,
 					    "psys", NULL,
 					    &zone_ops[RAPL_DOMAIN_PLATFORM],
 					    2, &constraint_ops);
@@ -1203,17 +1202,17 @@ static int __init rapl_register_psys(void)
 		return PTR_ERR(power_zone);
 	}
 
-	platform_rapl_domain = rd;
+	rapl_msr_priv.platform_rapl_domain = rd;
 
 	return 0;
 }
 
 static int __init rapl_register_powercap(void)
 {
-	control_type = powercap_register_control_type(NULL, "intel-rapl", NULL);
-	if (IS_ERR(control_type)) {
+	rapl_msr_priv.control_type = powercap_register_control_type(NULL, "intel-rapl", NULL);
+	if (IS_ERR(rapl_msr_priv.control_type)) {
 		pr_debug("failed to register powercap control_type.\n");
-		return PTR_ERR(control_type);
+		return PTR_ERR(rapl_msr_priv.control_type);
 	}
 	return 0;
 }
@@ -1338,16 +1337,16 @@ static void rapl_remove_package(struct rapl_package *rp)
 		}
 		pr_debug("remove package, undo power limit on %s: %s\n",
 			 rp->name, rd->name);
-		powercap_unregister_zone(control_type, &rd->power_zone);
+		powercap_unregister_zone(rp->priv->control_type, &rd->power_zone);
 	}
 	/* do parent zone last */
-	powercap_unregister_zone(control_type, &rd_package->power_zone);
+	powercap_unregister_zone(rp->priv->control_type, &rd_package->power_zone);
 	list_del(&rp->plist);
 	kfree(rp);
 }
 
 /* called from CPU hotplug notifier, hotplug lock held */
-static struct rapl_package *rapl_add_package(int cpu)
+static struct rapl_package *rapl_add_package(int cpu, struct rapl_priv *priv)
 {
 	int id = topology_logical_die_id(cpu);
 	struct rapl_package *rp;
@@ -1361,6 +1360,7 @@ static struct rapl_package *rapl_add_package(int cpu)
 	/* add the new package to the list */
 	rp->id = id;
 	rp->lead_cpu = cpu;
+	rp->priv = priv;
 
 	if (topology_max_die_per_package() > 1)
 		snprintf(rp->name, PACKAGE_DOMAIN_NAME_LENGTH,
@@ -1399,9 +1399,9 @@ static int rapl_cpu_online(unsigned int cpu)
 {
 	struct rapl_package *rp;
 
-	rp = rapl_find_package_domain(cpu);
+	rp = rapl_find_package_domain(cpu, &rapl_msr_priv);
 	if (!rp) {
-		rp = rapl_add_package(cpu);
+		rp = rapl_add_package(cpu, &rapl_msr_priv);
 		if (IS_ERR(rp))
 			return PTR_ERR(rp);
 	}
@@ -1414,7 +1414,7 @@ static int rapl_cpu_down_prep(unsigned int cpu)
 	struct rapl_package *rp;
 	int lead_cpu;
 
-	rp = rapl_find_package_domain(cpu);
+	rp = rapl_find_package_domain(cpu, &rapl_msr_priv);
 	if (!rp)
 		return 0;
 
@@ -1427,8 +1427,6 @@ static int rapl_cpu_down_prep(unsigned int cpu)
 	return 0;
 }
 
-static enum cpuhp_state pcap_rapl_online;
-
 static void power_limit_state_save(void)
 {
 	struct rapl_package *rp;
@@ -1538,7 +1536,7 @@ static int __init rapl_init(void)
 				rapl_cpu_online, rapl_cpu_down_prep);
 	if (ret < 0)
 		goto err_unreg;
-	pcap_rapl_online = ret;
+	rapl_msr_priv.pcap_rapl_online = ret;
 
 	/* Don't bail out if PSys is not supported */
 	rapl_register_psys();
@@ -1550,7 +1548,7 @@ static int __init rapl_init(void)
 	return 0;
 
 err_unreg_all:
-	cpuhp_remove_state(pcap_rapl_online);
+	cpuhp_remove_state(rapl_msr_priv.pcap_rapl_online);
 
 err_unreg:
 	rapl_unregister_powercap();
@@ -1560,7 +1558,7 @@ static int __init rapl_init(void)
 static void __exit rapl_exit(void)
 {
 	unregister_pm_notifier(&rapl_pm_notifier);
-	cpuhp_remove_state(pcap_rapl_online);
+	cpuhp_remove_state(rapl_msr_priv.pcap_rapl_online);
 	rapl_unregister_powercap();
 }
 
diff --git a/include/linux/intel_rapl.h b/include/linux/intel_rapl.h
index 9471603..d6a8547 100644
--- a/include/linux/intel_rapl.h
+++ b/include/linux/intel_rapl.h
@@ -88,6 +88,12 @@ struct rapl_domain {
 	struct rapl_package *rp;
 };
 
+struct rapl_priv {
+	struct powercap_control_type *control_type;
+	struct rapl_domain *platform_rapl_domain;
+	enum cpuhp_state pcap_rapl_online;
+};
+
 /* maximum rapl package domain name: package-%d-die-%d */
 #define PACKAGE_DOMAIN_NAME_LENGTH 30
 
@@ -108,6 +114,7 @@ struct rapl_package {
 	/* Track active cpus */
 	struct cpumask cpumask;
 	char name[PACKAGE_DOMAIN_NAME_LENGTH];
+	struct rapl_priv *priv;
 };
 
 #endif /* __INTEL_RAPL_H__ */
-- 
2.7.4

[PATCH 05/13] intel_rapl: abstract register address

[Zhang Rui]

MSR and MMIO RAPL interface have different sets of registers, thus the
RAPL register address should be obtained from interface specific
structure, i.e. struct rapl_private, instead.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
 drivers/powercap/intel_rapl.c | 73 +++++++++++++++++++------------------------
 include/linux/intel_rapl.h    |  2 ++
 2 files changed, 35 insertions(+), 40 deletions(-)

diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index a804370..70990ff 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -75,7 +75,19 @@ enum unit_type {
 	TIME_UNIT,
 };
 
-static struct rapl_priv rapl_msr_priv;
+static struct rapl_priv rapl_msr_priv = {
+	.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 },
+	.regs[RAPL_DOMAIN_PP0] = {
+		MSR_PP0_POWER_LIMIT, MSR_PP0_ENERGY_STATUS, 0, MSR_PP0_POLICY, 0 },
+	.regs[RAPL_DOMAIN_PP1] = {
+		MSR_PP1_POWER_LIMIT, MSR_PP1_ENERGY_STATUS, 0, MSR_PP1_POLICY, 0 },
+	.regs[RAPL_DOMAIN_DRAM] = {
+		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},
+};
 
 /* per domain data, some are optional */
 #define NR_RAW_PRIMITIVES (NR_RAPL_PRIMITIVES - 2)
@@ -540,15 +552,17 @@ static void rapl_init_domains(struct rapl_package *rp)
 
 	for (i = 0; i < RAPL_DOMAIN_MAX; i++) {
 		unsigned int mask = rp->domain_map & (1 << i);
+
+		rd->regs[RAPL_DOMAIN_REG_LIMIT] = rp->priv->regs[i][RAPL_DOMAIN_REG_LIMIT];
+		rd->regs[RAPL_DOMAIN_REG_STATUS] = rp->priv->regs[i][RAPL_DOMAIN_REG_STATUS];
+		rd->regs[RAPL_DOMAIN_REG_PERF] = rp->priv->regs[i][RAPL_DOMAIN_REG_PERF];
+		rd->regs[RAPL_DOMAIN_REG_POLICY] = rp->priv->regs[i][RAPL_DOMAIN_REG_POLICY];
+		rd->regs[RAPL_DOMAIN_REG_INFO] = rp->priv->regs[i][RAPL_DOMAIN_REG_INFO];
+
 		switch (mask) {
 		case BIT(RAPL_DOMAIN_PACKAGE):
 			rd->name = rapl_domain_names[RAPL_DOMAIN_PACKAGE];
 			rd->id = RAPL_DOMAIN_PACKAGE;
-			rd->regs[RAPL_DOMAIN_REG_LIMIT] = MSR_PKG_POWER_LIMIT;
-			rd->regs[RAPL_DOMAIN_REG_STATUS] = MSR_PKG_ENERGY_STATUS;
-			rd->regs[RAPL_DOMAIN_REG_PERF] = MSR_PKG_PERF_STATUS;
-			rd->regs[RAPL_DOMAIN_REG_POLICY] = 0;
-			rd->regs[RAPL_DOMAIN_REG_INFO] = MSR_PKG_POWER_INFO;
 			rd->rpl[0].prim_id = PL1_ENABLE;
 			rd->rpl[0].name = pl1_name;
 			rd->rpl[1].prim_id = PL2_ENABLE;
@@ -557,33 +571,18 @@ static void rapl_init_domains(struct rapl_package *rp)
 		case BIT(RAPL_DOMAIN_PP0):
 			rd->name = rapl_domain_names[RAPL_DOMAIN_PP0];
 			rd->id = RAPL_DOMAIN_PP0;
-			rd->regs[RAPL_DOMAIN_REG_LIMIT] = MSR_PP0_POWER_LIMIT;
-			rd->regs[RAPL_DOMAIN_REG_STATUS] = MSR_PP0_ENERGY_STATUS;
-			rd->regs[RAPL_DOMAIN_REG_PERF] = 0;
-			rd->regs[RAPL_DOMAIN_REG_POLICY] = MSR_PP0_POLICY;
-			rd->regs[RAPL_DOMAIN_REG_INFO] = 0;
 			rd->rpl[0].prim_id = PL1_ENABLE;
 			rd->rpl[0].name = pl1_name;
 			break;
 		case BIT(RAPL_DOMAIN_PP1):
 			rd->name = rapl_domain_names[RAPL_DOMAIN_PP1];
 			rd->id = RAPL_DOMAIN_PP1;
-			rd->regs[RAPL_DOMAIN_REG_LIMIT] = MSR_PP1_POWER_LIMIT;
-			rd->regs[RAPL_DOMAIN_REG_STATUS] = MSR_PP1_ENERGY_STATUS;
-			rd->regs[RAPL_DOMAIN_REG_PERF] = 0;
-			rd->regs[RAPL_DOMAIN_REG_POLICY] = MSR_PP1_POLICY;
-			rd->regs[RAPL_DOMAIN_REG_INFO] = 0;
 			rd->rpl[0].prim_id = PL1_ENABLE;
 			rd->rpl[0].name = pl1_name;
 			break;
 		case BIT(RAPL_DOMAIN_DRAM):
 			rd->name = rapl_domain_names[RAPL_DOMAIN_DRAM];
 			rd->id = RAPL_DOMAIN_DRAM;
-			rd->regs[RAPL_DOMAIN_REG_LIMIT] = MSR_DRAM_POWER_LIMIT;
-			rd->regs[RAPL_DOMAIN_REG_STATUS] = MSR_DRAM_ENERGY_STATUS;
-			rd->regs[RAPL_DOMAIN_REG_PERF] = MSR_DRAM_PERF_STATUS;
-			rd->regs[RAPL_DOMAIN_REG_POLICY] = 0;
-			rd->regs[RAPL_DOMAIN_REG_INFO] = MSR_DRAM_POWER_INFO;
 			rd->rpl[0].prim_id = PL1_ENABLE;
 			rd->rpl[0].name = pl1_name;
 			rd->domain_energy_unit =
@@ -805,9 +804,9 @@ static int rapl_check_unit_core(struct rapl_package *rp, int cpu)
 	u64 msr_val;
 	u32 value;
 
-	if (rdmsrl_safe_on_cpu(cpu, MSR_RAPL_POWER_UNIT, &msr_val)) {
+	if (rdmsrl_safe_on_cpu(cpu, rp->priv->reg_unit, &msr_val)) {
 		pr_err("Failed to read power unit MSR 0x%x on CPU %d, exit.\n",
-			MSR_RAPL_POWER_UNIT, cpu);
+			rp->priv->reg_unit, cpu);
 		return -ENODEV;
 	}
 
@@ -831,9 +830,9 @@ static int rapl_check_unit_atom(struct rapl_package *rp, int cpu)
 	u64 msr_val;
 	u32 value;
 
-	if (rdmsrl_safe_on_cpu(cpu, MSR_RAPL_POWER_UNIT, &msr_val)) {
+	if (rdmsrl_safe_on_cpu(cpu, rp->priv->reg_unit, &msr_val)) {
 		pr_err("Failed to read power unit MSR 0x%x on CPU %d, exit.\n",
-			MSR_RAPL_POWER_UNIT, cpu);
+			rp->priv->reg_unit, cpu);
 		return -ENODEV;
 	}
 	value = (msr_val & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET;
@@ -1172,10 +1171,10 @@ static int __init rapl_register_psys(void)
 	struct powercap_zone *power_zone;
 	u64 val;
 
-	if (rdmsrl_safe_on_cpu(0, MSR_PLATFORM_ENERGY_STATUS, &val) || !val)
+	if (rdmsrl_safe_on_cpu(0, rapl_msr_priv.regs[RAPL_DOMAIN_PLATFORM][RAPL_DOMAIN_REG_STATUS], &val) || !val)
 		return -ENODEV;
 
-	if (rdmsrl_safe_on_cpu(0, MSR_PLATFORM_POWER_LIMIT, &val) || !val)
+	if (rdmsrl_safe_on_cpu(0, rapl_msr_priv.regs[RAPL_DOMAIN_PLATFORM][RAPL_DOMAIN_REG_LIMIT], &val) || !val)
 		return -ENODEV;
 
 	rd = kzalloc(sizeof(*rd), GFP_KERNEL);
@@ -1184,8 +1183,8 @@ static int __init rapl_register_psys(void)
 
 	rd->name = rapl_domain_names[RAPL_DOMAIN_PLATFORM];
 	rd->id = RAPL_DOMAIN_PLATFORM;
-	rd->regs[RAPL_DOMAIN_REG_LIMIT] = MSR_PLATFORM_POWER_LIMIT;
-	rd->regs[RAPL_DOMAIN_REG_STATUS] = MSR_PLATFORM_ENERGY_STATUS;
+	rd->regs[RAPL_DOMAIN_REG_LIMIT] = rapl_msr_priv.regs[RAPL_DOMAIN_PLATFORM][RAPL_DOMAIN_REG_LIMIT];
+	rd->regs[RAPL_DOMAIN_REG_STATUS] = rapl_msr_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;
@@ -1217,23 +1216,17 @@ static int __init rapl_register_powercap(void)
 	return 0;
 }
 
-static int rapl_check_domain(int cpu, int domain)
+static int rapl_check_domain(int cpu, int domain, struct rapl_package *rp)
 {
-	unsigned msr;
+	u32 reg;
 	u64 val = 0;
 
 	switch (domain) {
 	case RAPL_DOMAIN_PACKAGE:
-		msr = MSR_PKG_ENERGY_STATUS;
-		break;
 	case RAPL_DOMAIN_PP0:
-		msr = MSR_PP0_ENERGY_STATUS;
-		break;
 	case RAPL_DOMAIN_PP1:
-		msr = MSR_PP1_ENERGY_STATUS;
-		break;
 	case RAPL_DOMAIN_DRAM:
-		msr = MSR_DRAM_ENERGY_STATUS;
+		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 */
@@ -1245,7 +1238,7 @@ static int rapl_check_domain(int cpu, int domain)
 	/* make sure domain counters are available and contains non-zero
 	 * values, otherwise skip it.
 	 */
-	if (rdmsrl_safe_on_cpu(cpu, msr, &val) || !val)
+	if (rdmsrl_safe_on_cpu(cpu, reg, &val) || !val)
 		return -ENODEV;
 
 	return 0;
@@ -1292,7 +1285,7 @@ static int rapl_detect_domains(struct rapl_package *rp, int cpu)
 
 	for (i = 0; i < RAPL_DOMAIN_MAX; i++) {
 		/* use physical package id to read counters */
-		if (!rapl_check_domain(cpu, i)) {
+		if (!rapl_check_domain(cpu, i, rp)) {
 			rp->domain_map |= 1 << i;
 			pr_info("Found RAPL domain %s\n", rapl_domain_names[i]);
 		}
diff --git a/include/linux/intel_rapl.h b/include/linux/intel_rapl.h
index d6a8547..0277579 100644
--- a/include/linux/intel_rapl.h
+++ b/include/linux/intel_rapl.h
@@ -92,6 +92,8 @@ struct rapl_priv {
 	struct powercap_control_type *control_type;
 	struct rapl_domain *platform_rapl_domain;
 	enum cpuhp_state pcap_rapl_online;
+	u32 reg_unit;
+	u32 regs[RAPL_DOMAIN_MAX][RAPL_DOMAIN_REG_MAX];
 };
 
 /* maximum rapl package domain name: package-%d-die-%d */
-- 
2.7.4

[PATCH 06/13] intel_rapl: abstract register access operations

[Zhang Rui]

MSR and MMIO RAPL interfaces have different ways to access the registers,
thus in order to abstract the regsiter access operations, two callbacks,
.read_raw()/.write_raw() are introduced, and they should be implemented by
MSR RAPL and MMIO RAPL interface driver respectly.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
 drivers/powercap/intel_rapl.c | 111 ++++++++++++++++++++++--------------------
 include/linux/intel_rapl.h    |   9 ++++
 2 files changed, 67 insertions(+), 53 deletions(-)

diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index 70990ff..7dc9965 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -92,13 +92,6 @@ static struct rapl_priv rapl_msr_priv = {
 /* per domain data, some are optional */
 #define NR_RAW_PRIMITIVES (NR_RAPL_PRIMITIVES - 2)
 
-struct msrl_action {
-	u32 msr_no;
-	u64 clear_mask;
-	u64 set_mask;
-	int err;
-};
-
 #define	DOMAIN_STATE_INACTIVE           BIT(0)
 #define	DOMAIN_STATE_POWER_LIMIT_SET    BIT(1)
 #define DOMAIN_STATE_BIOS_LOCKED        BIT(2)
@@ -691,16 +684,16 @@ static int rapl_read_data_raw(struct rapl_domain *rd,
 			enum rapl_primitives prim,
 			bool xlate, u64 *data)
 {
-	u64 value, final;
-	u32 msr;
+	u64 value;
 	struct rapl_primitive_info *rp = &rpi[prim];
+	struct reg_action ra;
 	int cpu;
 
 	if (!rp->name || rp->flag & RAPL_PRIMITIVE_DUMMY)
 		return -EINVAL;
 
-	msr = rd->regs[rp->id];
-	if (!msr)
+	ra.reg = rd->regs[rp->id];
+	if (!ra.reg)
 		return -EINVAL;
 
 	cpu = rd->rp->lead_cpu;
@@ -716,47 +709,23 @@ static int rapl_read_data_raw(struct rapl_domain *rd,
 		return 0;
 	}
 
-	if (rdmsrl_safe_on_cpu(cpu, msr, &value)) {
-		pr_debug("failed to read msr 0x%x on cpu %d\n", msr, cpu);
+	ra.mask = rp->mask;
+
+	if (rd->rp->priv->read_raw(cpu, &ra)) {
+		pr_debug("failed to read reg 0x%x on cpu %d\n", ra.reg, cpu);
 		return -EIO;
 	}
 
-	final = value & rp->mask;
-	final = final >> rp->shift;
+	value = ra.value >> rp->shift;
+
 	if (xlate)
-		*data = rapl_unit_xlate(rd, rp->unit, final, 0);
+		*data = rapl_unit_xlate(rd, rp->unit, value, 0);
 	else
-		*data = final;
+		*data = value;
 
 	return 0;
 }
 
-
-static int msrl_update_safe(u32 msr_no, u64 clear_mask, u64 set_mask)
-{
-	int err;
-	u64 val;
-
-	err = rdmsrl_safe(msr_no, &val);
-	if (err)
-		goto out;
-
-	val &= ~clear_mask;
-	val |= set_mask;
-
-	err = wrmsrl_safe(msr_no, val);
-
-out:
-	return err;
-}
-
-static void msrl_update_func(void *info)
-{
-	struct msrl_action *ma = info;
-
-	ma->err = msrl_update_safe(ma->msr_no, ma->clear_mask, ma->set_mask);
-}
-
 /* Similar use of primitive info in the read counterpart */
 static int rapl_write_data_raw(struct rapl_domain *rd,
 			enum rapl_primitives prim,
@@ -765,7 +734,7 @@ static int rapl_write_data_raw(struct rapl_domain *rd,
 	struct rapl_primitive_info *rp = &rpi[prim];
 	int cpu;
 	u64 bits;
-	struct msrl_action ma;
+	struct reg_action ra;
 	int ret;
 
 	cpu = rd->rp->lead_cpu;
@@ -773,17 +742,13 @@ static int rapl_write_data_raw(struct rapl_domain *rd,
 	bits <<= rp->shift;
 	bits &= rp->mask;
 
-	memset(&ma, 0, sizeof(ma));
+	memset(&ra, 0, sizeof(ra));
 
-	ma.msr_no = rd->regs[rp->id];
-	ma.clear_mask = rp->mask;
-	ma.set_mask = bits;
+	ra.reg = rd->regs[rp->id];
+	ra.mask = rp->mask;
+	ra.value = bits;
 
-	ret = smp_call_function_single(cpu, msrl_update_func, &ma, 1);
-	if (ret)
-		WARN_ON_ONCE(ret);
-	else
-		ret = ma.err;
+	ret = rd->rp->priv->write_raw(cpu, &ra);
 
 	return ret;
 }
@@ -1506,6 +1471,44 @@ static struct notifier_block rapl_pm_notifier = {
 	.notifier_call = rapl_pm_callback,
 };
 
+static int rapl_msr_read_raw(int cpu, struct reg_action *ra)
+{
+	if (rdmsrl_safe_on_cpu(cpu, ra->reg, &ra->value)) {
+		pr_debug("failed to read msr 0x%x on cpu %d\n", ra->reg, cpu);
+		return -EIO;
+	}
+	ra->value &= ra->mask;
+	return 0;
+}
+
+static void rapl_msr_update_func(void *info)
+{
+	struct reg_action *ra = info;
+	u64 val;
+
+	ra->err = rdmsrl_safe(ra->reg, &val);
+	if (ra->err)
+		return;
+
+	val &= ~ra->mask;
+	val |= ra->value;
+
+	ra->err = wrmsrl_safe(ra->reg, val);
+}
+
+
+static int rapl_msr_write_raw(int cpu, struct reg_action *ra)
+{
+	int ret;
+
+	ret = smp_call_function_single(cpu, rapl_msr_update_func, ra, 1);
+	if (ret)
+		WARN_ON_ONCE(ret);
+	else
+		ret = ra->err;
+	return ret;
+}
+
 static int __init rapl_init(void)
 {
 	const struct x86_cpu_id *id;
@@ -1521,6 +1524,8 @@ static int __init rapl_init(void)
 
 	rapl_defaults = (struct rapl_defaults *)id->driver_data;
 
+	rapl_msr_priv.read_raw = rapl_msr_read_raw;
+	rapl_msr_priv.write_raw = rapl_msr_write_raw;
 	ret = rapl_register_powercap();
 	if (ret)
 		return ret;
diff --git a/include/linux/intel_rapl.h b/include/linux/intel_rapl.h
index 0277579..1a0df65 100644
--- a/include/linux/intel_rapl.h
+++ b/include/linux/intel_rapl.h
@@ -88,12 +88,21 @@ struct rapl_domain {
 	struct rapl_package *rp;
 };
 
+struct reg_action {
+	u32 reg;
+	u64 mask;
+	u64 value;
+	int err;
+};
+
 struct rapl_priv {
 	struct powercap_control_type *control_type;
 	struct rapl_domain *platform_rapl_domain;
 	enum cpuhp_state pcap_rapl_online;
 	u32 reg_unit;
 	u32 regs[RAPL_DOMAIN_MAX][RAPL_DOMAIN_REG_MAX];
+	int (*read_raw)(int cpu, struct reg_action *ra);
+	int (*write_raw)(int cpu, struct reg_action *ra);
 };
 
 /* maximum rapl package domain name: package-%d-die-%d */
-- 
2.7.4

[PATCH 07/13] intel_rapl: cleanup some functions

[Zhang Rui]

Previously, there are three functions:
rapl_register_psys(), which registers platform rapl domain.
rapl_register_powercap(), which registers powercap control type.
rapl_unregsiter_powercap(), which unregisters platform rapl domain and
powercap control type.

This is confusing as the function name does not describe what it does
clearly.

With this patch, the three functions are removed, and two new functions
rapl_register_platform_domain()/rapl_unregister_platform_domain() are
introduced instead, and they do exactly what their function name describes.

Plus, as part of the common code, hardcoded MSR accesses in these functions
are converted to follow the abstracted register access.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
 drivers/powercap/intel_rapl.c | 62 +++++++++++++++++++++----------------------
 1 file changed, 31 insertions(+), 31 deletions(-)

diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index 7dc9965..fbf91dd5 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -1051,16 +1051,6 @@ static void rapl_update_domain_data(struct rapl_package *rp)
 
 }
 
-static void rapl_unregister_powercap(void)
-{
-	if (&rapl_msr_priv.platform_rapl_domain) {
-		powercap_unregister_zone(rapl_msr_priv.control_type,
-					 &rapl_msr_priv.platform_rapl_domain->power_zone);
-		kfree(rapl_msr_priv.platform_rapl_domain);
-	}
-	powercap_unregister_control_type(rapl_msr_priv.control_type);
-}
-
 static int rapl_package_register_powercap(struct rapl_package *rp)
 {
 	struct rapl_domain *rd;
@@ -1130,16 +1120,23 @@ static int rapl_package_register_powercap(struct rapl_package *rp)
 	return ret;
 }
 
-static int __init rapl_register_psys(void)
+static int __init rapl_add_platform_domain(struct rapl_priv *priv)
 {
 	struct rapl_domain *rd;
 	struct powercap_zone *power_zone;
-	u64 val;
+	struct reg_action ra;
+	int ret;
 
-	if (rdmsrl_safe_on_cpu(0, rapl_msr_priv.regs[RAPL_DOMAIN_PLATFORM][RAPL_DOMAIN_REG_STATUS], &val) || !val)
+	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;
 
-	if (rdmsrl_safe_on_cpu(0, rapl_msr_priv.regs[RAPL_DOMAIN_PLATFORM][RAPL_DOMAIN_REG_LIMIT], &val) || !val)
+	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);
@@ -1148,15 +1145,15 @@ static int __init rapl_register_psys(void)
 
 	rd->name = rapl_domain_names[RAPL_DOMAIN_PLATFORM];
 	rd->id = RAPL_DOMAIN_PLATFORM;
-	rd->regs[RAPL_DOMAIN_REG_LIMIT] = rapl_msr_priv.regs[RAPL_DOMAIN_PLATFORM][RAPL_DOMAIN_REG_LIMIT];
-	rd->regs[RAPL_DOMAIN_REG_STATUS] = rapl_msr_priv.regs[RAPL_DOMAIN_PLATFORM][RAPL_DOMAIN_REG_STATUS];
+	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, &rapl_msr_priv);
+	rd->rp = rapl_find_package_domain(0, priv);
 
-	power_zone = powercap_register_zone(&rd->power_zone, rapl_msr_priv.control_type,
+	power_zone = powercap_register_zone(&rd->power_zone, priv->control_type,
 					    "psys", NULL,
 					    &zone_ops[RAPL_DOMAIN_PLATFORM],
 					    2, &constraint_ops);
@@ -1166,19 +1163,18 @@ static int __init rapl_register_psys(void)
 		return PTR_ERR(power_zone);
 	}
 
-	rapl_msr_priv.platform_rapl_domain = rd;
+	priv->platform_rapl_domain = rd;
 
 	return 0;
 }
 
-static int __init rapl_register_powercap(void)
+static void rapl_remove_platform_domain(struct rapl_priv *priv)
 {
-	rapl_msr_priv.control_type = powercap_register_control_type(NULL, "intel-rapl", NULL);
-	if (IS_ERR(rapl_msr_priv.control_type)) {
-		pr_debug("failed to register powercap control_type.\n");
-		return PTR_ERR(rapl_msr_priv.control_type);
+	if (priv->platform_rapl_domain) {
+		powercap_unregister_zone(priv->control_type,
+			&priv->platform_rapl_domain->power_zone);
+		kfree(priv->platform_rapl_domain);
 	}
-	return 0;
 }
 
 static int rapl_check_domain(int cpu, int domain, struct rapl_package *rp)
@@ -1526,9 +1522,12 @@ static int __init rapl_init(void)
 
 	rapl_msr_priv.read_raw = rapl_msr_read_raw;
 	rapl_msr_priv.write_raw = rapl_msr_write_raw;
-	ret = rapl_register_powercap();
-	if (ret)
-		return ret;
+
+	rapl_msr_priv.control_type = powercap_register_control_type(NULL, "intel-rapl", NULL);
+	if (IS_ERR(rapl_msr_priv.control_type)) {
+		pr_debug("failed to register powercap control_type.\n");
+		return PTR_ERR(rapl_msr_priv.control_type);
+	}
 
 	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powercap/rapl:online",
 				rapl_cpu_online, rapl_cpu_down_prep);
@@ -1537,7 +1536,7 @@ static int __init rapl_init(void)
 	rapl_msr_priv.pcap_rapl_online = ret;
 
 	/* Don't bail out if PSys is not supported */
-	rapl_register_psys();
+	rapl_add_platform_domain(&rapl_msr_priv);
 
 	ret = register_pm_notifier(&rapl_pm_notifier);
 	if (ret)
@@ -1549,7 +1548,7 @@ static int __init rapl_init(void)
 	cpuhp_remove_state(rapl_msr_priv.pcap_rapl_online);
 
 err_unreg:
-	rapl_unregister_powercap();
+	powercap_unregister_control_type(rapl_msr_priv.control_type);
 	return ret;
 }
 
@@ -1557,7 +1556,8 @@ static void __exit rapl_exit(void)
 {
 	unregister_pm_notifier(&rapl_pm_notifier);
 	cpuhp_remove_state(rapl_msr_priv.pcap_rapl_online);
-	rapl_unregister_powercap();
+	rapl_remove_platform_domain(&rapl_msr_priv);
+	powercap_unregister_control_type(rapl_msr_priv.control_type);
 }
 
 module_init(rapl_init);
-- 
2.7.4

[PATCH 08/13] intel_rapl: cleanup hardcoded MSR access

[Zhang Rui]

There are still some places in the common code that have hardcoded
MSR access, convert them to follow the abstracted register access.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
 drivers/powercap/intel_rapl.c | 38 ++++++++++++++++++++++----------------
 1 file changed, 22 insertions(+), 16 deletions(-)

diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index fbf91dd5..e476bd1 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -766,22 +766,24 @@ static int rapl_write_data_raw(struct rapl_domain *rd,
  */
 static int rapl_check_unit_core(struct rapl_package *rp, int cpu)
 {
-	u64 msr_val;
+	struct reg_action ra;
 	u32 value;
 
-	if (rdmsrl_safe_on_cpu(cpu, rp->priv->reg_unit, &msr_val)) {
-		pr_err("Failed to read power unit MSR 0x%x on CPU %d, exit.\n",
+	ra.reg = rp->priv->reg_unit;
+	ra.mask = ~0;
+	if (rp->priv->read_raw(cpu, &ra)) {
+		pr_err("Failed to read power unit REG 0x%x on CPU %d, exit.\n",
 			rp->priv->reg_unit, cpu);
 		return -ENODEV;
 	}
 
-	value = (msr_val & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET;
+	value = (ra.value & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET;
 	rp->energy_unit = ENERGY_UNIT_SCALE * 1000000 / (1 << value);
 
-	value = (msr_val & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET;
+	value = (ra.value & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET;
 	rp->power_unit = 1000000 / (1 << value);
 
-	value = (msr_val & TIME_UNIT_MASK) >> TIME_UNIT_OFFSET;
+	value = (ra.value & TIME_UNIT_MASK) >> TIME_UNIT_OFFSET;
 	rp->time_unit = 1000000 / (1 << value);
 
 	pr_debug("Core CPU %s energy=%dpJ, time=%dus, power=%duW\n",
@@ -792,21 +794,24 @@ static int rapl_check_unit_core(struct rapl_package *rp, int cpu)
 
 static int rapl_check_unit_atom(struct rapl_package *rp, int cpu)
 {
-	u64 msr_val;
+	struct reg_action ra;
 	u32 value;
 
-	if (rdmsrl_safe_on_cpu(cpu, rp->priv->reg_unit, &msr_val)) {
-		pr_err("Failed to read power unit MSR 0x%x on CPU %d, exit.\n",
+	ra.reg = rp->priv->reg_unit;
+	ra.mask = ~0;
+	if (rp->priv->read_raw(cpu, &ra)) {
+		pr_err("Failed to read power unit REG 0x%x on CPU %d, exit.\n",
 			rp->priv->reg_unit, cpu);
 		return -ENODEV;
 	}
-	value = (msr_val & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET;
+
+	value = (ra.value & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET;
 	rp->energy_unit = ENERGY_UNIT_SCALE * 1 << value;
 
-	value = (msr_val & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET;
+	value = (ra.value & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET;
 	rp->power_unit = (1 << value) * 1000;
 
-	value = (msr_val & TIME_UNIT_MASK) >> TIME_UNIT_OFFSET;
+	value = (ra.value & TIME_UNIT_MASK) >> TIME_UNIT_OFFSET;
 	rp->time_unit = 1000000 / (1 << value);
 
 	pr_debug("Atom %s energy=%dpJ, time=%dus, power=%duW\n",
@@ -1179,15 +1184,14 @@ static void rapl_remove_platform_domain(struct rapl_priv *priv)
 
 static int rapl_check_domain(int cpu, int domain, struct rapl_package *rp)
 {
-	u32 reg;
-	u64 val = 0;
+	struct reg_action ra;
 
 	switch (domain) {
 	case RAPL_DOMAIN_PACKAGE:
 	case RAPL_DOMAIN_PP0:
 	case RAPL_DOMAIN_PP1:
 	case RAPL_DOMAIN_DRAM:
-		reg = rp->priv->regs[domain][RAPL_DOMAIN_REG_STATUS];
+		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 */
@@ -1199,7 +1203,9 @@ static int rapl_check_domain(int cpu, int domain, struct rapl_package *rp)
 	/* make sure domain counters are available and contains non-zero
 	 * values, otherwise skip it.
 	 */
-	if (rdmsrl_safe_on_cpu(cpu, reg, &val) || !val)
+
+	ra.mask = ~0;
+	if (rp->priv->read_raw(cpu, &ra) || !ra.value)
 		return -ENODEV;
 
 	return 0;
-- 
2.7.4

[PATCH 09/13] intel_rapl: abstract RAPL common code

[Zhang Rui]

Split intel_rapl.c to intel_rapl_common.c and intel_rapl.c, where
intel_rapl_common.c contains the common code that can be used by both MSR
and MMIO interface.
intel_rapl.c still contains the implementation of RAPL MSR interface.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
 drivers/powercap/Kconfig             |   11 +-
 drivers/powercap/Makefile            |    1 +
 drivers/powercap/intel_rapl.c        | 1427 +--------------------------------
 drivers/powercap/intel_rapl_common.c | 1468 ++++++++++++++++++++++++++++++++++
 include/linux/intel_rapl.h           |    7 +
 5 files changed, 1491 insertions(+), 1423 deletions(-)
 create mode 100644 drivers/powercap/intel_rapl_common.c

diff --git a/drivers/powercap/Kconfig b/drivers/powercap/Kconfig
index 42d3798..dc1c138 100644
--- a/drivers/powercap/Kconfig
+++ b/drivers/powercap/Kconfig
@@ -16,14 +16,17 @@ menuconfig POWERCAP
 
 if POWERCAP
 # Client driver configurations go here.
+config INTEL_RAPL_CORE
+	tristate
+
 config INTEL_RAPL
-	tristate "Intel RAPL Support"
+	tristate "Intel RAPL Support via MSR Interface"
 	depends on X86 && IOSF_MBI
-	default n
+	select INTEL_RAPL_CORE
 	---help---
 	  This enables support for the Intel Running Average Power Limit (RAPL)
-	  technology which allows power limits to be enforced and monitored on
-	  modern Intel processors (Sandy Bridge and later).
+	  technology via MSR interface, which allows power limits to be enforced
+	  and monitored on modern Intel processors (Sandy Bridge and later).
 
 	  In RAPL, the platform level settings are divided into domains for
 	  fine grained control. These domains include processor package, DRAM
diff --git a/drivers/powercap/Makefile b/drivers/powercap/Makefile
index 81c8cca..a692c6f 100644
--- a/drivers/powercap/Makefile
+++ b/drivers/powercap/Makefile
@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_POWERCAP)	+= powercap_sys.o
+obj-$(CONFIG_INTEL_RAPL_CORE) += intel_rapl_common.o
 obj-$(CONFIG_INTEL_RAPL) += intel_rapl.o
 obj-$(CONFIG_IDLE_INJECT) += idle_inject.o
diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index e476bd1..67130c4 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -28,53 +28,6 @@
 /* Local defines */
 #define MSR_PLATFORM_POWER_LIMIT	0x0000065C
 
-/* bitmasks for RAPL MSRs, used by primitive access functions */
-#define ENERGY_STATUS_MASK      0xffffffff
-
-#define POWER_LIMIT1_MASK       0x7FFF
-#define POWER_LIMIT1_ENABLE     BIT(15)
-#define POWER_LIMIT1_CLAMP      BIT(16)
-
-#define POWER_LIMIT2_MASK       (0x7FFFULL<<32)
-#define POWER_LIMIT2_ENABLE     BIT_ULL(47)
-#define POWER_LIMIT2_CLAMP      BIT_ULL(48)
-#define POWER_PACKAGE_LOCK      BIT_ULL(63)
-#define POWER_PP_LOCK           BIT(31)
-
-#define TIME_WINDOW1_MASK       (0x7FULL<<17)
-#define TIME_WINDOW2_MASK       (0x7FULL<<49)
-
-#define POWER_UNIT_OFFSET	0
-#define POWER_UNIT_MASK		0x0F
-
-#define ENERGY_UNIT_OFFSET	0x08
-#define ENERGY_UNIT_MASK	0x1F00
-
-#define TIME_UNIT_OFFSET	0x10
-#define TIME_UNIT_MASK		0xF0000
-
-#define POWER_INFO_MAX_MASK     (0x7fffULL<<32)
-#define POWER_INFO_MIN_MASK     (0x7fffULL<<16)
-#define POWER_INFO_MAX_TIME_WIN_MASK     (0x3fULL<<48)
-#define POWER_INFO_THERMAL_SPEC_MASK     0x7fff
-
-#define PERF_STATUS_THROTTLE_TIME_MASK 0xffffffff
-#define PP_POLICY_MASK         0x1F
-
-/* Non HW constants */
-#define RAPL_PRIMITIVE_DERIVED       BIT(1) /* not from raw data */
-#define RAPL_PRIMITIVE_DUMMY         BIT(2)
-
-#define TIME_WINDOW_MAX_MSEC 40000
-#define TIME_WINDOW_MIN_MSEC 250
-#define ENERGY_UNIT_SCALE    1000 /* scale from driver unit to powercap unit */
-enum unit_type {
-	ARBITRARY_UNIT, /* no translation */
-	POWER_UNIT,
-	ENERGY_UNIT,
-	TIME_UNIT,
-};
-
 static struct rapl_priv rapl_msr_priv = {
 	.reg_unit = MSR_RAPL_POWER_UNIT,
 	.regs[RAPL_DOMAIN_PACKAGE] = {
@@ -89,1265 +42,6 @@ static struct rapl_priv rapl_msr_priv = {
 		MSR_PLATFORM_POWER_LIMIT, MSR_PLATFORM_ENERGY_STATUS, 0, 0, 0},
 };
 
-/* per domain data, some are optional */
-#define NR_RAW_PRIMITIVES (NR_RAPL_PRIMITIVES - 2)
-
-#define	DOMAIN_STATE_INACTIVE           BIT(0)
-#define	DOMAIN_STATE_POWER_LIMIT_SET    BIT(1)
-#define DOMAIN_STATE_BIOS_LOCKED        BIT(2)
-
-static const char pl1_name[] = "long_term";
-static const char pl2_name[] = "short_term";
-
-#define power_zone_to_rapl_domain(_zone) \
-	container_of(_zone, struct rapl_domain, power_zone)
-
-struct rapl_defaults {
-	u8 floor_freq_reg_addr;
-	int (*check_unit)(struct rapl_package *rp, int cpu);
-	void (*set_floor_freq)(struct rapl_domain *rd, bool mode);
-	u64 (*compute_time_window)(struct rapl_package *rp, u64 val,
-				bool to_raw);
-	unsigned int dram_domain_energy_unit;
-};
-static struct rapl_defaults *rapl_defaults;
-
-/* Sideband MBI registers */
-#define IOSF_CPU_POWER_BUDGET_CTL_BYT (0x2)
-#define IOSF_CPU_POWER_BUDGET_CTL_TNG (0xdf)
-
-#define PACKAGE_PLN_INT_SAVED   BIT(0)
-#define MAX_PRIM_NAME (32)
-
-/* per domain data. used to describe individual knobs such that access function
- * can be consolidated into one instead of many inline functions.
- */
-struct rapl_primitive_info {
-	const char *name;
-	u64 mask;
-	int shift;
-	enum rapl_domain_reg_id id;
-	enum unit_type unit;
-	u32 flag;
-};
-
-#define PRIMITIVE_INFO_INIT(p, m, s, i, u, f) {	\
-		.name = #p,			\
-		.mask = m,			\
-		.shift = s,			\
-		.id = i,			\
-		.unit = u,			\
-		.flag = f			\
-	}
-
-static void rapl_init_domains(struct rapl_package *rp);
-static int rapl_read_data_raw(struct rapl_domain *rd,
-			enum rapl_primitives prim,
-			bool xlate, u64 *data);
-static int rapl_write_data_raw(struct rapl_domain *rd,
-			enum rapl_primitives prim,
-			unsigned long long value);
-static u64 rapl_unit_xlate(struct rapl_domain *rd,
-			enum unit_type type, u64 value,
-			int to_raw);
-static void package_power_limit_irq_save(struct rapl_package *rp);
-
-static LIST_HEAD(rapl_packages); /* guarded by CPU hotplug lock */
-
-static const char * const rapl_domain_names[] = {
-	"package",
-	"core",
-	"uncore",
-	"dram",
-	"psys",
-};
-
-/* caller to ensure CPU hotplug lock is held */
-static struct rapl_package *rapl_find_package_domain(int cpu, struct rapl_priv *priv)
-{
-	int id = topology_logical_die_id(cpu);
-	struct rapl_package *rp;
-
-	list_for_each_entry(rp, &rapl_packages, plist) {
-		if (rp->id == id && rp->priv->control_type == priv->control_type)
-			return rp;
-	}
-
-	return NULL;
-}
-
-static int get_energy_counter(struct powercap_zone *power_zone, u64 *energy_raw)
-{
-	struct rapl_domain *rd;
-	u64 energy_now;
-
-	/* prevent CPU hotplug, make sure the RAPL domain does not go
-	 * away while reading the counter.
-	 */
-	get_online_cpus();
-	rd = power_zone_to_rapl_domain(power_zone);
-
-	if (!rapl_read_data_raw(rd, ENERGY_COUNTER, true, &energy_now)) {
-		*energy_raw = energy_now;
-		put_online_cpus();
-
-		return 0;
-	}
-	put_online_cpus();
-
-	return -EIO;
-}
-
-static int get_max_energy_counter(struct powercap_zone *pcd_dev, u64 *energy)
-{
-	struct rapl_domain *rd = power_zone_to_rapl_domain(pcd_dev);
-
-	*energy = rapl_unit_xlate(rd, ENERGY_UNIT, ENERGY_STATUS_MASK, 0);
-	return 0;
-}
-
-static int release_zone(struct powercap_zone *power_zone)
-{
-	struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone);
-	struct rapl_package *rp = rd->rp;
-
-	/* package zone is the last zone of a package, we can free
-	 * memory here since all children has been unregistered.
-	 */
-	if (rd->id == RAPL_DOMAIN_PACKAGE) {
-		kfree(rd);
-		rp->domains = NULL;
-	}
-
-	return 0;
-
-}
-
-static int find_nr_power_limit(struct rapl_domain *rd)
-{
-	int i, nr_pl = 0;
-
-	for (i = 0; i < NR_POWER_LIMITS; i++) {
-		if (rd->rpl[i].name)
-			nr_pl++;
-	}
-
-	return nr_pl;
-}
-
-static int set_domain_enable(struct powercap_zone *power_zone, bool mode)
-{
-	struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone);
-
-	if (rd->state & DOMAIN_STATE_BIOS_LOCKED)
-		return -EACCES;
-
-	get_online_cpus();
-	rapl_write_data_raw(rd, PL1_ENABLE, mode);
-	if (rapl_defaults->set_floor_freq)
-		rapl_defaults->set_floor_freq(rd, mode);
-	put_online_cpus();
-
-	return 0;
-}
-
-static int get_domain_enable(struct powercap_zone *power_zone, bool *mode)
-{
-	struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone);
-	u64 val;
-
-	if (rd->state & DOMAIN_STATE_BIOS_LOCKED) {
-		*mode = false;
-		return 0;
-	}
-	get_online_cpus();
-	if (rapl_read_data_raw(rd, PL1_ENABLE, true, &val)) {
-		put_online_cpus();
-		return -EIO;
-	}
-	*mode = val;
-	put_online_cpus();
-
-	return 0;
-}
-
-/* per RAPL domain ops, in the order of rapl_domain_type */
-static const struct powercap_zone_ops zone_ops[] = {
-	/* RAPL_DOMAIN_PACKAGE */
-	{
-		.get_energy_uj = get_energy_counter,
-		.get_max_energy_range_uj = get_max_energy_counter,
-		.release = release_zone,
-		.set_enable = set_domain_enable,
-		.get_enable = get_domain_enable,
-	},
-	/* RAPL_DOMAIN_PP0 */
-	{
-		.get_energy_uj = get_energy_counter,
-		.get_max_energy_range_uj = get_max_energy_counter,
-		.release = release_zone,
-		.set_enable = set_domain_enable,
-		.get_enable = get_domain_enable,
-	},
-	/* RAPL_DOMAIN_PP1 */
-	{
-		.get_energy_uj = get_energy_counter,
-		.get_max_energy_range_uj = get_max_energy_counter,
-		.release = release_zone,
-		.set_enable = set_domain_enable,
-		.get_enable = get_domain_enable,
-	},
-	/* RAPL_DOMAIN_DRAM */
-	{
-		.get_energy_uj = get_energy_counter,
-		.get_max_energy_range_uj = get_max_energy_counter,
-		.release = release_zone,
-		.set_enable = set_domain_enable,
-		.get_enable = get_domain_enable,
-	},
-	/* RAPL_DOMAIN_PLATFORM */
-	{
-		.get_energy_uj = get_energy_counter,
-		.get_max_energy_range_uj = get_max_energy_counter,
-		.release = release_zone,
-		.set_enable = set_domain_enable,
-		.get_enable = get_domain_enable,
-	},
-};
-
-
-/*
- * 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;
-		}
-	}
-	pr_err("Cannot find matching power limit for constraint %d\n", cid);
-
-	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);
-	if (id < 0) {
-		ret = id;
-		goto set_exit;
-	}
-
-	rp = rd->rp;
-
-	if (rd->state & DOMAIN_STATE_BIOS_LOCKED) {
-		dev_warn(&power_zone->dev, "%s locked by BIOS, monitoring only\n",
-			rd->name);
-		ret = -EACCES;
-		goto set_exit;
-	}
-
-	switch (rd->rpl[id].prim_id) {
-	case PL1_ENABLE:
-		rapl_write_data_raw(rd, POWER_LIMIT1, power_limit);
-		break;
-	case PL2_ENABLE:
-		rapl_write_data_raw(rd, POWER_LIMIT2, power_limit);
-		break;
-	default:
-		ret = -EINVAL;
-	}
-	if (!ret)
-		package_power_limit_irq_save(rp);
-set_exit:
-	put_online_cpus();
-	return ret;
-}
-
-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);
-	if (id < 0) {
-		ret = id;
-		goto get_exit;
-	}
-
-	switch (rd->rpl[id].prim_id) {
-	case PL1_ENABLE:
-		prim = POWER_LIMIT1;
-		break;
-	case PL2_ENABLE:
-		prim = POWER_LIMIT2;
-		break;
-	default:
-		put_online_cpus();
-		return -EINVAL;
-	}
-	if (rapl_read_data_raw(rd, prim, true, &val))
-		ret = -EIO;
-	else
-		*data = val;
-
-get_exit:
-	put_online_cpus();
-
-	return ret;
-}
-
-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);
-	if (id < 0) {
-		ret = id;
-		goto set_time_exit;
-	}
-
-	switch (rd->rpl[id].prim_id) {
-	case PL1_ENABLE:
-		rapl_write_data_raw(rd, TIME_WINDOW1, window);
-		break;
-	case PL2_ENABLE:
-		rapl_write_data_raw(rd, TIME_WINDOW2, window);
-		break;
-	default:
-		ret = -EINVAL;
-	}
-
-set_time_exit:
-	put_online_cpus();
-	return ret;
-}
-
-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);
-	if (id < 0) {
-		ret = id;
-		goto get_time_exit;
-	}
-
-	switch (rd->rpl[id].prim_id) {
-	case PL1_ENABLE:
-		ret = rapl_read_data_raw(rd, TIME_WINDOW1, true, &val);
-		break;
-	case PL2_ENABLE:
-		ret = rapl_read_data_raw(rd, TIME_WINDOW2, true, &val);
-		break;
-	default:
-		put_online_cpus();
-		return -EINVAL;
-	}
-	if (!ret)
-		*data = val;
-
-get_time_exit:
-	put_online_cpus();
-
-	return ret;
-}
-
-static const char *get_constraint_name(struct powercap_zone *power_zone, int cid)
-{
-	struct rapl_domain *rd;
-	int id;
-
-	rd = power_zone_to_rapl_domain(power_zone);
-	id = contraint_to_pl(rd, cid);
-	if (id >= 0)
-		return rd->rpl[id].name;
-
-	return NULL;
-}
-
-
-static int get_max_power(struct powercap_zone *power_zone, int id,
-					u64 *data)
-{
-	struct rapl_domain *rd;
-	u64 val;
-	int prim;
-	int ret = 0;
-
-	get_online_cpus();
-	rd = power_zone_to_rapl_domain(power_zone);
-	switch (rd->rpl[id].prim_id) {
-	case PL1_ENABLE:
-		prim = THERMAL_SPEC_POWER;
-		break;
-	case PL2_ENABLE:
-		prim = MAX_POWER;
-		break;
-	default:
-		put_online_cpus();
-		return -EINVAL;
-	}
-	if (rapl_read_data_raw(rd, prim, true, &val))
-		ret = -EIO;
-	else
-		*data = val;
-
-	put_online_cpus();
-
-	return ret;
-}
-
-static const struct powercap_zone_constraint_ops constraint_ops = {
-	.set_power_limit_uw = set_power_limit,
-	.get_power_limit_uw = get_current_power_limit,
-	.set_time_window_us = set_time_window,
-	.get_time_window_us = get_time_window,
-	.get_max_power_uw = get_max_power,
-	.get_name = get_constraint_name,
-};
-
-/* called after domain detection and package level data are set */
-static void rapl_init_domains(struct rapl_package *rp)
-{
-	int i;
-	struct rapl_domain *rd = rp->domains;
-
-	for (i = 0; i < RAPL_DOMAIN_MAX; i++) {
-		unsigned int mask = rp->domain_map & (1 << i);
-
-		rd->regs[RAPL_DOMAIN_REG_LIMIT] = rp->priv->regs[i][RAPL_DOMAIN_REG_LIMIT];
-		rd->regs[RAPL_DOMAIN_REG_STATUS] = rp->priv->regs[i][RAPL_DOMAIN_REG_STATUS];
-		rd->regs[RAPL_DOMAIN_REG_PERF] = rp->priv->regs[i][RAPL_DOMAIN_REG_PERF];
-		rd->regs[RAPL_DOMAIN_REG_POLICY] = rp->priv->regs[i][RAPL_DOMAIN_REG_POLICY];
-		rd->regs[RAPL_DOMAIN_REG_INFO] = rp->priv->regs[i][RAPL_DOMAIN_REG_INFO];
-
-		switch (mask) {
-		case BIT(RAPL_DOMAIN_PACKAGE):
-			rd->name = rapl_domain_names[RAPL_DOMAIN_PACKAGE];
-			rd->id = RAPL_DOMAIN_PACKAGE;
-			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;
-			break;
-		case BIT(RAPL_DOMAIN_PP0):
-			rd->name = rapl_domain_names[RAPL_DOMAIN_PP0];
-			rd->id = RAPL_DOMAIN_PP0;
-			rd->rpl[0].prim_id = PL1_ENABLE;
-			rd->rpl[0].name = pl1_name;
-			break;
-		case BIT(RAPL_DOMAIN_PP1):
-			rd->name = rapl_domain_names[RAPL_DOMAIN_PP1];
-			rd->id = RAPL_DOMAIN_PP1;
-			rd->rpl[0].prim_id = PL1_ENABLE;
-			rd->rpl[0].name = pl1_name;
-			break;
-		case BIT(RAPL_DOMAIN_DRAM):
-			rd->name = rapl_domain_names[RAPL_DOMAIN_DRAM];
-			rd->id = RAPL_DOMAIN_DRAM;
-			rd->rpl[0].prim_id = PL1_ENABLE;
-			rd->rpl[0].name = pl1_name;
-			rd->domain_energy_unit =
-				rapl_defaults->dram_domain_energy_unit;
-			if (rd->domain_energy_unit)
-				pr_info("DRAM domain energy unit %dpj\n",
-					rd->domain_energy_unit);
-			break;
-		}
-		if (mask) {
-			rd->rp = rp;
-			rd++;
-		}
-	}
-}
-
-static u64 rapl_unit_xlate(struct rapl_domain *rd, enum unit_type type,
-			u64 value, int to_raw)
-{
-	u64 units = 1;
-	struct rapl_package *rp = rd->rp;
-	u64 scale = 1;
-
-	switch (type) {
-	case POWER_UNIT:
-		units = rp->power_unit;
-		break;
-	case ENERGY_UNIT:
-		scale = ENERGY_UNIT_SCALE;
-		/* per domain unit takes precedence */
-		if (rd->domain_energy_unit)
-			units = rd->domain_energy_unit;
-		else
-			units = rp->energy_unit;
-		break;
-	case TIME_UNIT:
-		return rapl_defaults->compute_time_window(rp, value, to_raw);
-	case ARBITRARY_UNIT:
-	default:
-		return value;
-	};
-
-	if (to_raw)
-		return div64_u64(value, units) * scale;
-
-	value *= units;
-
-	return div64_u64(value, scale);
-}
-
-/* in the order of enum rapl_primitives */
-static struct rapl_primitive_info rpi[] = {
-	/* name, mask, shift, msr index, unit divisor */
-	PRIMITIVE_INFO_INIT(ENERGY_COUNTER, ENERGY_STATUS_MASK, 0,
-				RAPL_DOMAIN_REG_STATUS, ENERGY_UNIT, 0),
-	PRIMITIVE_INFO_INIT(POWER_LIMIT1, POWER_LIMIT1_MASK, 0,
-				RAPL_DOMAIN_REG_LIMIT, POWER_UNIT, 0),
-	PRIMITIVE_INFO_INIT(POWER_LIMIT2, POWER_LIMIT2_MASK, 32,
-				RAPL_DOMAIN_REG_LIMIT, POWER_UNIT, 0),
-	PRIMITIVE_INFO_INIT(FW_LOCK, POWER_PP_LOCK, 31,
-				RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
-	PRIMITIVE_INFO_INIT(PL1_ENABLE, POWER_LIMIT1_ENABLE, 15,
-				RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
-	PRIMITIVE_INFO_INIT(PL1_CLAMP, POWER_LIMIT1_CLAMP, 16,
-				RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
-	PRIMITIVE_INFO_INIT(PL2_ENABLE, POWER_LIMIT2_ENABLE, 47,
-				RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
-	PRIMITIVE_INFO_INIT(PL2_CLAMP, POWER_LIMIT2_CLAMP, 48,
-				RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
-	PRIMITIVE_INFO_INIT(TIME_WINDOW1, TIME_WINDOW1_MASK, 17,
-				RAPL_DOMAIN_REG_LIMIT, TIME_UNIT, 0),
-	PRIMITIVE_INFO_INIT(TIME_WINDOW2, TIME_WINDOW2_MASK, 49,
-				RAPL_DOMAIN_REG_LIMIT, TIME_UNIT, 0),
-	PRIMITIVE_INFO_INIT(THERMAL_SPEC_POWER, POWER_INFO_THERMAL_SPEC_MASK,
-				0, RAPL_DOMAIN_REG_INFO, POWER_UNIT, 0),
-	PRIMITIVE_INFO_INIT(MAX_POWER, POWER_INFO_MAX_MASK, 32,
-				RAPL_DOMAIN_REG_INFO, POWER_UNIT, 0),
-	PRIMITIVE_INFO_INIT(MIN_POWER, POWER_INFO_MIN_MASK, 16,
-				RAPL_DOMAIN_REG_INFO, POWER_UNIT, 0),
-	PRIMITIVE_INFO_INIT(MAX_TIME_WINDOW, POWER_INFO_MAX_TIME_WIN_MASK, 48,
-				RAPL_DOMAIN_REG_INFO, TIME_UNIT, 0),
-	PRIMITIVE_INFO_INIT(THROTTLED_TIME, PERF_STATUS_THROTTLE_TIME_MASK, 0,
-				RAPL_DOMAIN_REG_PERF, TIME_UNIT, 0),
-	PRIMITIVE_INFO_INIT(PRIORITY_LEVEL, PP_POLICY_MASK, 0,
-				RAPL_DOMAIN_REG_POLICY, ARBITRARY_UNIT, 0),
-	/* non-hardware */
-	PRIMITIVE_INFO_INIT(AVERAGE_POWER, 0, 0, 0, POWER_UNIT,
-				RAPL_PRIMITIVE_DERIVED),
-	{NULL, 0, 0, 0},
-};
-
-/* Read primitive data based on its related struct rapl_primitive_info.
- * if xlate flag is set, return translated data based on data units, i.e.
- * time, energy, and power.
- * RAPL MSRs are non-architectual and are laid out not consistently across
- * domains. Here we use primitive info to allow writing consolidated access
- * functions.
- * For a given primitive, it is processed by MSR mask and shift. Unit conversion
- * is pre-assigned based on RAPL unit MSRs read at init time.
- * 63-------------------------- 31--------------------------- 0
- * |                           xxxxx (mask)                   |
- * |                                |<- shift ----------------|
- * 63-------------------------- 31--------------------------- 0
- */
-static int rapl_read_data_raw(struct rapl_domain *rd,
-			enum rapl_primitives prim,
-			bool xlate, u64 *data)
-{
-	u64 value;
-	struct rapl_primitive_info *rp = &rpi[prim];
-	struct reg_action ra;
-	int cpu;
-
-	if (!rp->name || rp->flag & RAPL_PRIMITIVE_DUMMY)
-		return -EINVAL;
-
-	ra.reg = rd->regs[rp->id];
-	if (!ra.reg)
-		return -EINVAL;
-
-	cpu = rd->rp->lead_cpu;
-
-	/* special-case package domain, which uses a different bit*/
-	if (prim == FW_LOCK && rd->id == RAPL_DOMAIN_PACKAGE) {
-		rp->mask = POWER_PACKAGE_LOCK;
-		rp->shift = 63;
-	}
-	/* non-hardware data are collected by the polling thread */
-	if (rp->flag & RAPL_PRIMITIVE_DERIVED) {
-		*data = rd->rdd.primitives[prim];
-		return 0;
-	}
-
-	ra.mask = rp->mask;
-
-	if (rd->rp->priv->read_raw(cpu, &ra)) {
-		pr_debug("failed to read reg 0x%x on cpu %d\n", ra.reg, cpu);
-		return -EIO;
-	}
-
-	value = ra.value >> rp->shift;
-
-	if (xlate)
-		*data = rapl_unit_xlate(rd, rp->unit, value, 0);
-	else
-		*data = value;
-
-	return 0;
-}
-
-/* Similar use of primitive info in the read counterpart */
-static int rapl_write_data_raw(struct rapl_domain *rd,
-			enum rapl_primitives prim,
-			unsigned long long value)
-{
-	struct rapl_primitive_info *rp = &rpi[prim];
-	int cpu;
-	u64 bits;
-	struct reg_action ra;
-	int ret;
-
-	cpu = rd->rp->lead_cpu;
-	bits = rapl_unit_xlate(rd, rp->unit, value, 1);
-	bits <<= rp->shift;
-	bits &= rp->mask;
-
-	memset(&ra, 0, sizeof(ra));
-
-	ra.reg = rd->regs[rp->id];
-	ra.mask = rp->mask;
-	ra.value = bits;
-
-	ret = rd->rp->priv->write_raw(cpu, &ra);
-
-	return ret;
-}
-
-/*
- * Raw RAPL data stored in MSRs are in certain scales. We need to
- * convert them into standard units based on the units reported in
- * the RAPL unit MSRs. This is specific to CPUs as the method to
- * calculate units differ on different CPUs.
- * We convert the units to below format based on CPUs.
- * i.e.
- * energy unit: picoJoules  : Represented in picoJoules by default
- * power unit : microWatts  : Represented in milliWatts by default
- * time unit  : microseconds: Represented in seconds by default
- */
-static int rapl_check_unit_core(struct rapl_package *rp, int cpu)
-{
-	struct reg_action ra;
-	u32 value;
-
-	ra.reg = rp->priv->reg_unit;
-	ra.mask = ~0;
-	if (rp->priv->read_raw(cpu, &ra)) {
-		pr_err("Failed to read power unit REG 0x%x on CPU %d, exit.\n",
-			rp->priv->reg_unit, cpu);
-		return -ENODEV;
-	}
-
-	value = (ra.value & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET;
-	rp->energy_unit = ENERGY_UNIT_SCALE * 1000000 / (1 << value);
-
-	value = (ra.value & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET;
-	rp->power_unit = 1000000 / (1 << value);
-
-	value = (ra.value & TIME_UNIT_MASK) >> TIME_UNIT_OFFSET;
-	rp->time_unit = 1000000 / (1 << value);
-
-	pr_debug("Core CPU %s energy=%dpJ, time=%dus, power=%duW\n",
-		rp->name, rp->energy_unit, rp->time_unit, rp->power_unit);
-
-	return 0;
-}
-
-static int rapl_check_unit_atom(struct rapl_package *rp, int cpu)
-{
-	struct reg_action ra;
-	u32 value;
-
-	ra.reg = rp->priv->reg_unit;
-	ra.mask = ~0;
-	if (rp->priv->read_raw(cpu, &ra)) {
-		pr_err("Failed to read power unit REG 0x%x on CPU %d, exit.\n",
-			rp->priv->reg_unit, cpu);
-		return -ENODEV;
-	}
-
-	value = (ra.value & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET;
-	rp->energy_unit = ENERGY_UNIT_SCALE * 1 << value;
-
-	value = (ra.value & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET;
-	rp->power_unit = (1 << value) * 1000;
-
-	value = (ra.value & TIME_UNIT_MASK) >> TIME_UNIT_OFFSET;
-	rp->time_unit = 1000000 / (1 << value);
-
-	pr_debug("Atom %s energy=%dpJ, time=%dus, power=%duW\n",
-		rp->name, rp->energy_unit, rp->time_unit, rp->power_unit);
-
-	return 0;
-}
-
-static void power_limit_irq_save_cpu(void *info)
-{
-	u32 l, h = 0;
-	struct rapl_package *rp = (struct rapl_package *)info;
-
-	/* save the state of PLN irq mask bit before disabling it */
-	rdmsr_safe(MSR_IA32_PACKAGE_THERM_INTERRUPT, &l, &h);
-	if (!(rp->power_limit_irq & PACKAGE_PLN_INT_SAVED)) {
-		rp->power_limit_irq = l & PACKAGE_THERM_INT_PLN_ENABLE;
-		rp->power_limit_irq |= PACKAGE_PLN_INT_SAVED;
-	}
-	l &= ~PACKAGE_THERM_INT_PLN_ENABLE;
-	wrmsr_safe(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
-}
-
-
-/* REVISIT:
- * When package power limit is set artificially low by RAPL, LVT
- * thermal interrupt for package power limit should be ignored
- * since we are not really exceeding the real limit. The intention
- * is to avoid excessive interrupts while we are trying to save power.
- * A useful feature might be routing the package_power_limit interrupt
- * to userspace via eventfd. once we have a usecase, this is simple
- * to do by adding an atomic notifier.
- */
-
-static void package_power_limit_irq_save(struct rapl_package *rp)
-{
-	if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN))
-		return;
-
-	smp_call_function_single(rp->lead_cpu, power_limit_irq_save_cpu, rp, 1);
-}
-
-/*
- * Restore per package power limit interrupt enable state. Called from cpu
- * hotplug code on package removal.
- */
-static void package_power_limit_irq_restore(struct rapl_package *rp)
-{
-	u32 l, h;
-
-	if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN))
-		return;
-
-	/* irq enable state not saved, nothing to restore */
-	if (!(rp->power_limit_irq & PACKAGE_PLN_INT_SAVED))
-		return;
-
-	rdmsr_safe(MSR_IA32_PACKAGE_THERM_INTERRUPT, &l, &h);
-
-	if (rp->power_limit_irq & PACKAGE_THERM_INT_PLN_ENABLE)
-		l |= PACKAGE_THERM_INT_PLN_ENABLE;
-	else
-		l &= ~PACKAGE_THERM_INT_PLN_ENABLE;
-
-	wrmsr_safe(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
-}
-
-static void set_floor_freq_default(struct rapl_domain *rd, bool mode)
-{
-	int nr_powerlimit = find_nr_power_limit(rd);
-
-	/* always enable clamp such that p-state can go below OS requested
-	 * range. power capping priority over guranteed frequency.
-	 */
-	rapl_write_data_raw(rd, PL1_CLAMP, mode);
-
-	/* some domains have pl2 */
-	if (nr_powerlimit > 1) {
-		rapl_write_data_raw(rd, PL2_ENABLE, mode);
-		rapl_write_data_raw(rd, PL2_CLAMP, mode);
-	}
-}
-
-static void set_floor_freq_atom(struct rapl_domain *rd, bool enable)
-{
-	static u32 power_ctrl_orig_val;
-	u32 mdata;
-
-	if (!rapl_defaults->floor_freq_reg_addr) {
-		pr_err("Invalid floor frequency config register\n");
-		return;
-	}
-
-	if (!power_ctrl_orig_val)
-		iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_CR_READ,
-			      rapl_defaults->floor_freq_reg_addr,
-			      &power_ctrl_orig_val);
-	mdata = power_ctrl_orig_val;
-	if (enable) {
-		mdata &= ~(0x7f << 8);
-		mdata |= 1 << 8;
-	}
-	iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_CR_WRITE,
-		       rapl_defaults->floor_freq_reg_addr, mdata);
-}
-
-static u64 rapl_compute_time_window_core(struct rapl_package *rp, u64 value,
-					bool to_raw)
-{
-	u64 f, y; /* fraction and exp. used for time unit */
-
-	/*
-	 * Special processing based on 2^Y*(1+F/4), refer
-	 * to Intel Software Developer's manual Vol.3B: CH 14.9.3.
-	 */
-	if (!to_raw) {
-		f = (value & 0x60) >> 5;
-		y = value & 0x1f;
-		value = (1 << y) * (4 + f) * rp->time_unit / 4;
-	} else {
-		do_div(value, rp->time_unit);
-		y = ilog2(value);
-		f = div64_u64(4 * (value - (1 << y)), 1 << y);
-		value = (y & 0x1f) | ((f & 0x3) << 5);
-	}
-	return value;
-}
-
-static u64 rapl_compute_time_window_atom(struct rapl_package *rp, u64 value,
-					bool to_raw)
-{
-	/*
-	 * Atom time unit encoding is straight forward val * time_unit,
-	 * where time_unit is default to 1 sec. Never 0.
-	 */
-	if (!to_raw)
-		return (value) ? value *= rp->time_unit : rp->time_unit;
-	else
-		value = div64_u64(value, rp->time_unit);
-
-	return value;
-}
-
-static const struct rapl_defaults rapl_defaults_core = {
-	.floor_freq_reg_addr = 0,
-	.check_unit = rapl_check_unit_core,
-	.set_floor_freq = set_floor_freq_default,
-	.compute_time_window = rapl_compute_time_window_core,
-};
-
-static const struct rapl_defaults rapl_defaults_hsw_server = {
-	.check_unit = rapl_check_unit_core,
-	.set_floor_freq = set_floor_freq_default,
-	.compute_time_window = rapl_compute_time_window_core,
-	.dram_domain_energy_unit = 15300,
-};
-
-static const struct rapl_defaults rapl_defaults_byt = {
-	.floor_freq_reg_addr = IOSF_CPU_POWER_BUDGET_CTL_BYT,
-	.check_unit = rapl_check_unit_atom,
-	.set_floor_freq = set_floor_freq_atom,
-	.compute_time_window = rapl_compute_time_window_atom,
-};
-
-static const struct rapl_defaults rapl_defaults_tng = {
-	.floor_freq_reg_addr = IOSF_CPU_POWER_BUDGET_CTL_TNG,
-	.check_unit = rapl_check_unit_atom,
-	.set_floor_freq = set_floor_freq_atom,
-	.compute_time_window = rapl_compute_time_window_atom,
-};
-
-static const struct rapl_defaults rapl_defaults_ann = {
-	.floor_freq_reg_addr = 0,
-	.check_unit = rapl_check_unit_atom,
-	.set_floor_freq = NULL,
-	.compute_time_window = rapl_compute_time_window_atom,
-};
-
-static const struct rapl_defaults rapl_defaults_cht = {
-	.floor_freq_reg_addr = 0,
-	.check_unit = rapl_check_unit_atom,
-	.set_floor_freq = NULL,
-	.compute_time_window = rapl_compute_time_window_atom,
-};
-
-static const struct x86_cpu_id rapl_ids[] __initconst = {
-	INTEL_CPU_FAM6(SANDYBRIDGE,		rapl_defaults_core),
-	INTEL_CPU_FAM6(SANDYBRIDGE_X,		rapl_defaults_core),
-
-	INTEL_CPU_FAM6(IVYBRIDGE,		rapl_defaults_core),
-	INTEL_CPU_FAM6(IVYBRIDGE_X,		rapl_defaults_core),
-
-	INTEL_CPU_FAM6(HASWELL_CORE,		rapl_defaults_core),
-	INTEL_CPU_FAM6(HASWELL_ULT,		rapl_defaults_core),
-	INTEL_CPU_FAM6(HASWELL_GT3E,		rapl_defaults_core),
-	INTEL_CPU_FAM6(HASWELL_X,		rapl_defaults_hsw_server),
-
-	INTEL_CPU_FAM6(BROADWELL_CORE,		rapl_defaults_core),
-	INTEL_CPU_FAM6(BROADWELL_GT3E,		rapl_defaults_core),
-	INTEL_CPU_FAM6(BROADWELL_XEON_D,	rapl_defaults_core),
-	INTEL_CPU_FAM6(BROADWELL_X,		rapl_defaults_hsw_server),
-
-	INTEL_CPU_FAM6(SKYLAKE_DESKTOP,		rapl_defaults_core),
-	INTEL_CPU_FAM6(SKYLAKE_MOBILE,		rapl_defaults_core),
-	INTEL_CPU_FAM6(SKYLAKE_X,		rapl_defaults_hsw_server),
-	INTEL_CPU_FAM6(KABYLAKE_MOBILE,		rapl_defaults_core),
-	INTEL_CPU_FAM6(KABYLAKE_DESKTOP,	rapl_defaults_core),
-	INTEL_CPU_FAM6(CANNONLAKE_MOBILE,	rapl_defaults_core),
-	INTEL_CPU_FAM6(ICELAKE_MOBILE,		rapl_defaults_core),
-
-	INTEL_CPU_FAM6(ATOM_SILVERMONT,		rapl_defaults_byt),
-	INTEL_CPU_FAM6(ATOM_AIRMONT,		rapl_defaults_cht),
-	INTEL_CPU_FAM6(ATOM_SILVERMONT_MID,	rapl_defaults_tng),
-	INTEL_CPU_FAM6(ATOM_AIRMONT_MID,	rapl_defaults_ann),
-	INTEL_CPU_FAM6(ATOM_GOLDMONT,		rapl_defaults_core),
-	INTEL_CPU_FAM6(ATOM_GOLDMONT_PLUS,	rapl_defaults_core),
-	INTEL_CPU_FAM6(ATOM_GOLDMONT_X,		rapl_defaults_core),
-	INTEL_CPU_FAM6(ATOM_TREMONT_X,		rapl_defaults_core),
-
-	INTEL_CPU_FAM6(XEON_PHI_KNL,		rapl_defaults_hsw_server),
-	INTEL_CPU_FAM6(XEON_PHI_KNM,		rapl_defaults_hsw_server),
-	{}
-};
-MODULE_DEVICE_TABLE(x86cpu, rapl_ids);
-
-/* Read once for all raw primitive data for domains */
-static void rapl_update_domain_data(struct rapl_package *rp)
-{
-	int dmn, prim;
-	u64 val;
-
-	for (dmn = 0; dmn < rp->nr_domains; dmn++) {
-		pr_debug("update %s domain %s data\n", rp->name,
-			 rp->domains[dmn].name);
-		/* exclude non-raw primitives */
-		for (prim = 0; prim < NR_RAW_PRIMITIVES; prim++) {
-			if (!rapl_read_data_raw(&rp->domains[dmn], prim,
-						rpi[prim].unit, &val))
-				rp->domains[dmn].rdd.primitives[prim] =	val;
-		}
-	}
-
-}
-
-static int rapl_package_register_powercap(struct rapl_package *rp)
-{
-	struct rapl_domain *rd;
-	struct powercap_zone *power_zone = NULL;
-	int nr_pl, ret;
-
-	/* Update the domain data of the new package */
-	rapl_update_domain_data(rp);
-
-	/* first we register package domain as the parent zone*/
-	for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) {
-		if (rd->id == RAPL_DOMAIN_PACKAGE) {
-			nr_pl = find_nr_power_limit(rd);
-			pr_debug("register package domain %s\n", rp->name);
-			power_zone = powercap_register_zone(&rd->power_zone,
-							rp->priv->control_type,
-							rp->name, NULL,
-							&zone_ops[rd->id],
-							nr_pl,
-							&constraint_ops);
-			if (IS_ERR(power_zone)) {
-				pr_debug("failed to register power zone %s\n",
-					rp->name);
-				return PTR_ERR(power_zone);
-			}
-			/* track parent zone in per package/socket data */
-			rp->power_zone = power_zone;
-			/* done, only one package domain per socket */
-			break;
-		}
-	}
-	if (!power_zone) {
-		pr_err("no package domain found, unknown topology!\n");
-		return -ENODEV;
-	}
-	/* now register domains as children of the socket/package*/
-	for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) {
-		if (rd->id == RAPL_DOMAIN_PACKAGE)
-			continue;
-		/* 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,
-						&zone_ops[rd->id], nr_pl,
-						&constraint_ops);
-
-		if (IS_ERR(power_zone)) {
-			pr_debug("failed to register power_zone, %s:%s\n",
-				rp->name, rd->name);
-			ret = PTR_ERR(power_zone);
-			goto err_cleanup;
-		}
-	}
-	return 0;
-
-err_cleanup:
-	/*
-	 * Clean up previously initialized domains within the package if we
-	 * failed after the first domain setup.
-	 */
-	while (--rd >= rp->domains) {
-		pr_debug("unregister %s domain %s\n", rp->name, rd->name);
-		powercap_unregister_zone(rp->priv->control_type, &rd->power_zone);
-	}
-
-	return ret;
-}
-
-static int __init rapl_add_platform_domain(struct rapl_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;
-}
-
-static void rapl_remove_platform_domain(struct rapl_priv *priv)
-{
-	if (priv->platform_rapl_domain) {
-		powercap_unregister_zone(priv->control_type,
-			&priv->platform_rapl_domain->power_zone);
-		kfree(priv->platform_rapl_domain);
-	}
-}
-
-static int rapl_check_domain(int cpu, int domain, struct rapl_package *rp)
-{
-	struct reg_action ra;
-
-	switch (domain) {
-	case RAPL_DOMAIN_PACKAGE:
-	case RAPL_DOMAIN_PP0:
-	case RAPL_DOMAIN_PP1:
-	case RAPL_DOMAIN_DRAM:
-		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;
-	}
-	/* make sure domain counters are available and contains non-zero
-	 * values, otherwise skip it.
-	 */
-
-	ra.mask = ~0;
-	if (rp->priv->read_raw(cpu, &ra) || !ra.value)
-		return -ENODEV;
-
-	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 %s domain %s locked by BIOS\n",
-				rd->rp->name, 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.
- */
-static int rapl_detect_domains(struct rapl_package *rp, int cpu)
-{
-	struct rapl_domain *rd;
-	int i;
-
-	for (i = 0; i < RAPL_DOMAIN_MAX; i++) {
-		/* use physical package id to read counters */
-		if (!rapl_check_domain(cpu, i, rp)) {
-			rp->domain_map |= 1 << i;
-			pr_info("Found RAPL domain %s\n", rapl_domain_names[i]);
-		}
-	}
-	rp->nr_domains = bitmap_weight(&rp->domain_map,	RAPL_DOMAIN_MAX);
-	if (!rp->nr_domains) {
-		pr_debug("no valid rapl domains found in %s\n", rp->name);
-		return -ENODEV;
-	}
-	pr_debug("found %d domains on %s\n", rp->nr_domains, rp->name);
-
-	rp->domains = kcalloc(rp->nr_domains + 1, sizeof(struct rapl_domain),
-			GFP_KERNEL);
-	if (!rp->domains)
-		return -ENOMEM;
-
-	rapl_init_domains(rp);
-
-	for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++)
-		rapl_detect_powerlimit(rd);
-
-	return 0;
-}
-
-/* called from CPU hotplug notifier, hotplug lock held */
-static void rapl_remove_package(struct rapl_package *rp)
-{
-	struct rapl_domain *rd, *rd_package = NULL;
-
-	package_power_limit_irq_restore(rp);
-
-	for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) {
-		rapl_write_data_raw(rd, PL1_ENABLE, 0);
-		rapl_write_data_raw(rd, PL1_CLAMP, 0);
-		if (find_nr_power_limit(rd) > 1) {
-			rapl_write_data_raw(rd, PL2_ENABLE, 0);
-			rapl_write_data_raw(rd, PL2_CLAMP, 0);
-		}
-		if (rd->id == RAPL_DOMAIN_PACKAGE) {
-			rd_package = rd;
-			continue;
-		}
-		pr_debug("remove package, undo power limit on %s: %s\n",
-			 rp->name, rd->name);
-		powercap_unregister_zone(rp->priv->control_type, &rd->power_zone);
-	}
-	/* do parent zone last */
-	powercap_unregister_zone(rp->priv->control_type, &rd_package->power_zone);
-	list_del(&rp->plist);
-	kfree(rp);
-}
-
-/* called from CPU hotplug notifier, hotplug lock held */
-static struct rapl_package *rapl_add_package(int cpu, struct rapl_priv *priv)
-{
-	int id = topology_logical_die_id(cpu);
-	struct rapl_package *rp;
-	struct cpuinfo_x86 *c = &cpu_data(cpu);
-	int ret;
-
-	rp = kzalloc(sizeof(struct rapl_package), GFP_KERNEL);
-	if (!rp)
-		return ERR_PTR(-ENOMEM);
-
-	/* add the new package to the list */
-	rp->id = id;
-	rp->lead_cpu = cpu;
-	rp->priv = priv;
-
-	if (topology_max_die_per_package() > 1)
-		snprintf(rp->name, PACKAGE_DOMAIN_NAME_LENGTH,
-			"package-%d-die-%d", c->phys_proc_id, c->cpu_die_id);
-	else
-		snprintf(rp->name, PACKAGE_DOMAIN_NAME_LENGTH, "package-%d",
-			c->phys_proc_id);
-
-	/* check if the package contains valid domains */
-	if (rapl_detect_domains(rp, cpu) ||
-		rapl_defaults->check_unit(rp, cpu)) {
-		ret = -ENODEV;
-		goto err_free_package;
-	}
-	ret = rapl_package_register_powercap(rp);
-	if (!ret) {
-		INIT_LIST_HEAD(&rp->plist);
-		list_add(&rp->plist, &rapl_packages);
-		return rp;
-	}
-
-err_free_package:
-	kfree(rp->domains);
-	kfree(rp);
-	return ERR_PTR(ret);
-}
-
 /* 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
@@ -1387,92 +81,6 @@ static int rapl_cpu_down_prep(unsigned int cpu)
 	return 0;
 }
 
-static void power_limit_state_save(void)
-{
-	struct rapl_package *rp;
-	struct rapl_domain *rd;
-	int nr_pl, ret, i;
-
-	get_online_cpus();
-	list_for_each_entry(rp, &rapl_packages, plist) {
-		if (!rp->power_zone)
-			continue;
-		rd = power_zone_to_rapl_domain(rp->power_zone);
-		nr_pl = find_nr_power_limit(rd);
-		for (i = 0; i < nr_pl; i++) {
-			switch (rd->rpl[i].prim_id) {
-			case PL1_ENABLE:
-				ret = rapl_read_data_raw(rd,
-						POWER_LIMIT1,
-						true,
-						&rd->rpl[i].last_power_limit);
-				if (ret)
-					rd->rpl[i].last_power_limit = 0;
-				break;
-			case PL2_ENABLE:
-				ret = rapl_read_data_raw(rd,
-						POWER_LIMIT2,
-						true,
-						&rd->rpl[i].last_power_limit);
-				if (ret)
-					rd->rpl[i].last_power_limit = 0;
-				break;
-			}
-		}
-	}
-	put_online_cpus();
-}
-
-static void power_limit_state_restore(void)
-{
-	struct rapl_package *rp;
-	struct rapl_domain *rd;
-	int nr_pl, i;
-
-	get_online_cpus();
-	list_for_each_entry(rp, &rapl_packages, plist) {
-		if (!rp->power_zone)
-			continue;
-		rd = power_zone_to_rapl_domain(rp->power_zone);
-		nr_pl = find_nr_power_limit(rd);
-		for (i = 0; i < nr_pl; i++) {
-			switch (rd->rpl[i].prim_id) {
-			case PL1_ENABLE:
-				if (rd->rpl[i].last_power_limit)
-					rapl_write_data_raw(rd,
-						POWER_LIMIT1,
-						rd->rpl[i].last_power_limit);
-				break;
-			case PL2_ENABLE:
-				if (rd->rpl[i].last_power_limit)
-					rapl_write_data_raw(rd,
-						POWER_LIMIT2,
-						rd->rpl[i].last_power_limit);
-				break;
-			}
-		}
-	}
-	put_online_cpus();
-}
-
-static int rapl_pm_callback(struct notifier_block *nb,
-	unsigned long mode, void *_unused)
-{
-	switch (mode) {
-	case PM_SUSPEND_PREPARE:
-		power_limit_state_save();
-		break;
-	case PM_POST_SUSPEND:
-		power_limit_state_restore();
-		break;
-	}
-	return NOTIFY_OK;
-}
-
-static struct notifier_block rapl_pm_notifier = {
-	.notifier_call = rapl_pm_callback,
-};
-
 static int rapl_msr_read_raw(int cpu, struct reg_action *ra)
 {
 	if (rdmsrl_safe_on_cpu(cpu, ra->reg, &ra->value)) {
@@ -1498,7 +106,6 @@ static void rapl_msr_update_func(void *info)
 	ra->err = wrmsrl_safe(ra->reg, val);
 }
 
-
 static int rapl_msr_write_raw(int cpu, struct reg_action *ra)
 {
 	int ret;
@@ -1511,21 +118,10 @@ static int rapl_msr_write_raw(int cpu, struct reg_action *ra)
 	return ret;
 }
 
-static int __init rapl_init(void)
+static int __init rapl_msr_init(void)
 {
-	const struct x86_cpu_id *id;
 	int ret;
 
-	id = x86_match_cpu(rapl_ids);
-	if (!id) {
-		pr_err("driver does not support CPU family %d model %d\n",
-			boot_cpu_data.x86, boot_cpu_data.x86_model);
-
-		return -ENODEV;
-	}
-
-	rapl_defaults = (struct rapl_defaults *)id->driver_data;
-
 	rapl_msr_priv.read_raw = rapl_msr_read_raw;
 	rapl_msr_priv.write_raw = rapl_msr_write_raw;
 
@@ -1538,36 +134,29 @@ static int __init rapl_init(void)
 	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powercap/rapl:online",
 				rapl_cpu_online, rapl_cpu_down_prep);
 	if (ret < 0)
-		goto err_unreg;
+		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);
 
-	ret = register_pm_notifier(&rapl_pm_notifier);
-	if (ret)
-		goto err_unreg_all;
-
 	return 0;
 
-err_unreg_all:
-	cpuhp_remove_state(rapl_msr_priv.pcap_rapl_online);
-
-err_unreg:
-	powercap_unregister_control_type(rapl_msr_priv.control_type);
+out:
+	if (ret)
+		powercap_unregister_control_type(rapl_msr_priv.control_type);
 	return ret;
 }
 
-static void __exit rapl_exit(void)
+static void __exit rapl_msr_exit(void)
 {
-	unregister_pm_notifier(&rapl_pm_notifier);
 	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);
 }
 
-module_init(rapl_init);
-module_exit(rapl_exit);
+module_init(rapl_msr_init);
+module_exit(rapl_msr_exit);
 
 MODULE_DESCRIPTION("Driver for Intel RAPL (Running Average Power Limit)");
 MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@intel.com>");
diff --git a/drivers/powercap/intel_rapl_common.c b/drivers/powercap/intel_rapl_common.c
new file mode 100644
index 0000000..8f589cf
--- /dev/null
+++ b/drivers/powercap/intel_rapl_common.c
@@ -0,0 +1,1468 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Common code for Intel Running Average Power Limit (RAPL) support.
+ * Copyright (c) 2019, Intel Corporation.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/log2.h>
+#include <linux/bitmap.h>
+#include <linux/delay.h>
+#include <linux/sysfs.h>
+#include <linux/cpu.h>
+#include <linux/powercap.h>
+#include <linux/suspend.h>
+#include <asm/iosf_mbi.h>
+#include <linux/intel_rapl.h>
+
+#include <linux/processor.h>
+#include <asm/cpu_device_id.h>
+#include <asm/intel-family.h>
+
+/* Local defines */
+#define MSR_PLATFORM_POWER_LIMIT	0x0000065C
+
+/* bitmasks for RAPL MSRs, used by primitive access functions */
+#define ENERGY_STATUS_MASK      0xffffffff
+
+#define POWER_LIMIT1_MASK       0x7FFF
+#define POWER_LIMIT1_ENABLE     BIT(15)
+#define POWER_LIMIT1_CLAMP      BIT(16)
+
+#define POWER_LIMIT2_MASK       (0x7FFFULL<<32)
+#define POWER_LIMIT2_ENABLE     BIT_ULL(47)
+#define POWER_LIMIT2_CLAMP      BIT_ULL(48)
+#define POWER_PACKAGE_LOCK      BIT_ULL(63)
+#define POWER_PP_LOCK           BIT(31)
+
+#define TIME_WINDOW1_MASK       (0x7FULL<<17)
+#define TIME_WINDOW2_MASK       (0x7FULL<<49)
+
+#define POWER_UNIT_OFFSET	0
+#define POWER_UNIT_MASK		0x0F
+
+#define ENERGY_UNIT_OFFSET	0x08
+#define ENERGY_UNIT_MASK	0x1F00
+
+#define TIME_UNIT_OFFSET	0x10
+#define TIME_UNIT_MASK		0xF0000
+
+#define POWER_INFO_MAX_MASK     (0x7fffULL<<32)
+#define POWER_INFO_MIN_MASK     (0x7fffULL<<16)
+#define POWER_INFO_MAX_TIME_WIN_MASK     (0x3fULL<<48)
+#define POWER_INFO_THERMAL_SPEC_MASK     0x7fff
+
+#define PERF_STATUS_THROTTLE_TIME_MASK 0xffffffff
+#define PP_POLICY_MASK         0x1F
+
+/* Non HW constants */
+#define RAPL_PRIMITIVE_DERIVED       BIT(1)	/* not from raw data */
+#define RAPL_PRIMITIVE_DUMMY         BIT(2)
+
+#define TIME_WINDOW_MAX_MSEC 40000
+#define TIME_WINDOW_MIN_MSEC 250
+#define ENERGY_UNIT_SCALE    1000	/* scale from driver unit to powercap unit */
+enum unit_type {
+	ARBITRARY_UNIT,		/* no translation */
+	POWER_UNIT,
+	ENERGY_UNIT,
+	TIME_UNIT,
+};
+
+/* per domain data, some are optional */
+#define NR_RAW_PRIMITIVES (NR_RAPL_PRIMITIVES - 2)
+
+#define	DOMAIN_STATE_INACTIVE           BIT(0)
+#define	DOMAIN_STATE_POWER_LIMIT_SET    BIT(1)
+#define DOMAIN_STATE_BIOS_LOCKED        BIT(2)
+
+static const char pl1_name[] = "long_term";
+static const char pl2_name[] = "short_term";
+
+#define power_zone_to_rapl_domain(_zone) \
+	container_of(_zone, struct rapl_domain, power_zone)
+
+struct rapl_defaults {
+	u8 floor_freq_reg_addr;
+	int (*check_unit)(struct rapl_package *rp, int cpu);
+	void (*set_floor_freq)(struct rapl_domain *rd, bool mode);
+	u64 (*compute_time_window)(struct rapl_package *rp, u64 val,
+				    bool to_raw);
+	unsigned int dram_domain_energy_unit;
+};
+static struct rapl_defaults *rapl_defaults;
+
+/* Sideband MBI registers */
+#define IOSF_CPU_POWER_BUDGET_CTL_BYT (0x2)
+#define IOSF_CPU_POWER_BUDGET_CTL_TNG (0xdf)
+
+#define PACKAGE_PLN_INT_SAVED   BIT(0)
+#define MAX_PRIM_NAME (32)
+
+/* per domain data. used to describe individual knobs such that access function
+ * can be consolidated into one instead of many inline functions.
+ */
+struct rapl_primitive_info {
+	const char *name;
+	u64 mask;
+	int shift;
+	enum rapl_domain_reg_id id;
+	enum unit_type unit;
+	u32 flag;
+};
+
+#define PRIMITIVE_INFO_INIT(p, m, s, i, u, f) {	\
+		.name = #p,			\
+		.mask = m,			\
+		.shift = s,			\
+		.id = i,			\
+		.unit = u,			\
+		.flag = f			\
+	}
+
+static void rapl_init_domains(struct rapl_package *rp);
+static int rapl_read_data_raw(struct rapl_domain *rd,
+			      enum rapl_primitives prim,
+			      bool xlate, u64 *data);
+static int rapl_write_data_raw(struct rapl_domain *rd,
+			       enum rapl_primitives prim,
+			       unsigned long long value);
+static u64 rapl_unit_xlate(struct rapl_domain *rd,
+			   enum unit_type type, u64 value, int to_raw);
+static void package_power_limit_irq_save(struct rapl_package *rp);
+static int rapl_init_core(void);
+static void rapl_remove_core(void);
+
+static LIST_HEAD(rapl_packages);	/* guarded by CPU hotplug lock */
+
+static const char *const rapl_domain_names[] = {
+	"package",
+	"core",
+	"uncore",
+	"dram",
+	"psys",
+};
+
+static int get_energy_counter(struct powercap_zone *power_zone,
+			      u64 *energy_raw)
+{
+	struct rapl_domain *rd;
+	u64 energy_now;
+
+	/* prevent CPU hotplug, make sure the RAPL domain does not go
+	 * away while reading the counter.
+	 */
+	get_online_cpus();
+	rd = power_zone_to_rapl_domain(power_zone);
+
+	if (!rapl_read_data_raw(rd, ENERGY_COUNTER, true, &energy_now)) {
+		*energy_raw = energy_now;
+		put_online_cpus();
+
+		return 0;
+	}
+	put_online_cpus();
+
+	return -EIO;
+}
+
+static int get_max_energy_counter(struct powercap_zone *pcd_dev, u64 *energy)
+{
+	struct rapl_domain *rd = power_zone_to_rapl_domain(pcd_dev);
+
+	*energy = rapl_unit_xlate(rd, ENERGY_UNIT, ENERGY_STATUS_MASK, 0);
+	return 0;
+}
+
+static int release_zone(struct powercap_zone *power_zone)
+{
+	struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone);
+	struct rapl_package *rp = rd->rp;
+
+	/* package zone is the last zone of a package, we can free
+	 * memory here since all children has been unregistered.
+	 */
+	if (rd->id == RAPL_DOMAIN_PACKAGE) {
+		kfree(rd);
+		rp->domains = NULL;
+	}
+
+	return 0;
+
+}
+
+static int find_nr_power_limit(struct rapl_domain *rd)
+{
+	int i, nr_pl = 0;
+
+	for (i = 0; i < NR_POWER_LIMITS; i++) {
+		if (rd->rpl[i].name)
+			nr_pl++;
+	}
+
+	return nr_pl;
+}
+
+static int set_domain_enable(struct powercap_zone *power_zone, bool mode)
+{
+	struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone);
+
+	if (rd->state & DOMAIN_STATE_BIOS_LOCKED)
+		return -EACCES;
+
+	get_online_cpus();
+	rapl_write_data_raw(rd, PL1_ENABLE, mode);
+	if (rapl_defaults->set_floor_freq)
+		rapl_defaults->set_floor_freq(rd, mode);
+	put_online_cpus();
+
+	return 0;
+}
+
+static int get_domain_enable(struct powercap_zone *power_zone, bool *mode)
+{
+	struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone);
+	u64 val;
+
+	if (rd->state & DOMAIN_STATE_BIOS_LOCKED) {
+		*mode = false;
+		return 0;
+	}
+	get_online_cpus();
+	if (rapl_read_data_raw(rd, PL1_ENABLE, true, &val)) {
+		put_online_cpus();
+		return -EIO;
+	}
+	*mode = val;
+	put_online_cpus();
+
+	return 0;
+}
+
+/* per RAPL domain ops, in the order of rapl_domain_type */
+static const struct powercap_zone_ops zone_ops[] = {
+	/* RAPL_DOMAIN_PACKAGE */
+	{
+	 .get_energy_uj = get_energy_counter,
+	 .get_max_energy_range_uj = get_max_energy_counter,
+	 .release = release_zone,
+	 .set_enable = set_domain_enable,
+	 .get_enable = get_domain_enable,
+	 },
+	/* RAPL_DOMAIN_PP0 */
+	{
+	 .get_energy_uj = get_energy_counter,
+	 .get_max_energy_range_uj = get_max_energy_counter,
+	 .release = release_zone,
+	 .set_enable = set_domain_enable,
+	 .get_enable = get_domain_enable,
+	 },
+	/* RAPL_DOMAIN_PP1 */
+	{
+	 .get_energy_uj = get_energy_counter,
+	 .get_max_energy_range_uj = get_max_energy_counter,
+	 .release = release_zone,
+	 .set_enable = set_domain_enable,
+	 .get_enable = get_domain_enable,
+	 },
+	/* RAPL_DOMAIN_DRAM */
+	{
+	 .get_energy_uj = get_energy_counter,
+	 .get_max_energy_range_uj = get_max_energy_counter,
+	 .release = release_zone,
+	 .set_enable = set_domain_enable,
+	 .get_enable = get_domain_enable,
+	 },
+	/* RAPL_DOMAIN_PLATFORM */
+	{
+	 .get_energy_uj = get_energy_counter,
+	 .get_max_energy_range_uj = get_max_energy_counter,
+	 .release = release_zone,
+	 .set_enable = set_domain_enable,
+	 .get_enable = get_domain_enable,
+	 },
+};
+
+/*
+ * Constraint index used by powercap can be different than power limit (PL)
+ * index in that some  PLs maybe missing due to non-existent 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;
+		}
+	}
+	pr_err("Cannot find matching power limit for constraint %d\n", cid);
+
+	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);
+	if (id < 0) {
+		ret = id;
+		goto set_exit;
+	}
+
+	rp = rd->rp;
+
+	if (rd->state & DOMAIN_STATE_BIOS_LOCKED) {
+		dev_warn(&power_zone->dev,
+			 "%s locked by BIOS, monitoring only\n", rd->name);
+		ret = -EACCES;
+		goto set_exit;
+	}
+
+	switch (rd->rpl[id].prim_id) {
+	case PL1_ENABLE:
+		rapl_write_data_raw(rd, POWER_LIMIT1, power_limit);
+		break;
+	case PL2_ENABLE:
+		rapl_write_data_raw(rd, POWER_LIMIT2, power_limit);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+	if (!ret)
+		package_power_limit_irq_save(rp);
+set_exit:
+	put_online_cpus();
+	return ret;
+}
+
+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);
+	if (id < 0) {
+		ret = id;
+		goto get_exit;
+	}
+
+	switch (rd->rpl[id].prim_id) {
+	case PL1_ENABLE:
+		prim = POWER_LIMIT1;
+		break;
+	case PL2_ENABLE:
+		prim = POWER_LIMIT2;
+		break;
+	default:
+		put_online_cpus();
+		return -EINVAL;
+	}
+	if (rapl_read_data_raw(rd, prim, true, &val))
+		ret = -EIO;
+	else
+		*data = val;
+
+get_exit:
+	put_online_cpus();
+
+	return ret;
+}
+
+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);
+	if (id < 0) {
+		ret = id;
+		goto set_time_exit;
+	}
+
+	switch (rd->rpl[id].prim_id) {
+	case PL1_ENABLE:
+		rapl_write_data_raw(rd, TIME_WINDOW1, window);
+		break;
+	case PL2_ENABLE:
+		rapl_write_data_raw(rd, TIME_WINDOW2, window);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+set_time_exit:
+	put_online_cpus();
+	return ret;
+}
+
+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);
+	if (id < 0) {
+		ret = id;
+		goto get_time_exit;
+	}
+
+	switch (rd->rpl[id].prim_id) {
+	case PL1_ENABLE:
+		ret = rapl_read_data_raw(rd, TIME_WINDOW1, true, &val);
+		break;
+	case PL2_ENABLE:
+		ret = rapl_read_data_raw(rd, TIME_WINDOW2, true, &val);
+		break;
+	default:
+		put_online_cpus();
+		return -EINVAL;
+	}
+	if (!ret)
+		*data = val;
+
+get_time_exit:
+	put_online_cpus();
+
+	return ret;
+}
+
+static const char *get_constraint_name(struct powercap_zone *power_zone,
+				       int cid)
+{
+	struct rapl_domain *rd;
+	int id;
+
+	rd = power_zone_to_rapl_domain(power_zone);
+	id = contraint_to_pl(rd, cid);
+	if (id >= 0)
+		return rd->rpl[id].name;
+
+	return NULL;
+}
+
+static int get_max_power(struct powercap_zone *power_zone, int id, u64 *data)
+{
+	struct rapl_domain *rd;
+	u64 val;
+	int prim;
+	int ret = 0;
+
+	get_online_cpus();
+	rd = power_zone_to_rapl_domain(power_zone);
+	switch (rd->rpl[id].prim_id) {
+	case PL1_ENABLE:
+		prim = THERMAL_SPEC_POWER;
+		break;
+	case PL2_ENABLE:
+		prim = MAX_POWER;
+		break;
+	default:
+		put_online_cpus();
+		return -EINVAL;
+	}
+	if (rapl_read_data_raw(rd, prim, true, &val))
+		ret = -EIO;
+	else
+		*data = val;
+
+	put_online_cpus();
+
+	return ret;
+}
+
+static const struct powercap_zone_constraint_ops constraint_ops = {
+	.set_power_limit_uw = set_power_limit,
+	.get_power_limit_uw = get_current_power_limit,
+	.set_time_window_us = set_time_window,
+	.get_time_window_us = get_time_window,
+	.get_max_power_uw = get_max_power,
+	.get_name = get_constraint_name,
+};
+
+/* called after domain detection and package level data are set */
+static void rapl_init_domains(struct rapl_package *rp)
+{
+	int i;
+	struct rapl_domain *rd = rp->domains;
+
+	for (i = 0; i < RAPL_DOMAIN_MAX; i++) {
+		unsigned int mask = rp->domain_map & (1 << i);
+
+		rd->regs[RAPL_DOMAIN_REG_LIMIT] =
+		    rp->priv->regs[i][RAPL_DOMAIN_REG_LIMIT];
+		rd->regs[RAPL_DOMAIN_REG_STATUS] =
+		    rp->priv->regs[i][RAPL_DOMAIN_REG_STATUS];
+		rd->regs[RAPL_DOMAIN_REG_PERF] =
+		    rp->priv->regs[i][RAPL_DOMAIN_REG_PERF];
+		rd->regs[RAPL_DOMAIN_REG_POLICY] =
+		    rp->priv->regs[i][RAPL_DOMAIN_REG_POLICY];
+		rd->regs[RAPL_DOMAIN_REG_INFO] =
+		    rp->priv->regs[i][RAPL_DOMAIN_REG_INFO];
+
+		switch (mask) {
+		case BIT(RAPL_DOMAIN_PACKAGE):
+			rd->name = rapl_domain_names[RAPL_DOMAIN_PACKAGE];
+			rd->id = RAPL_DOMAIN_PACKAGE;
+			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;
+			break;
+		case BIT(RAPL_DOMAIN_PP0):
+			rd->name = rapl_domain_names[RAPL_DOMAIN_PP0];
+			rd->id = RAPL_DOMAIN_PP0;
+			rd->rpl[0].prim_id = PL1_ENABLE;
+			rd->rpl[0].name = pl1_name;
+			break;
+		case BIT(RAPL_DOMAIN_PP1):
+			rd->name = rapl_domain_names[RAPL_DOMAIN_PP1];
+			rd->id = RAPL_DOMAIN_PP1;
+			rd->rpl[0].prim_id = PL1_ENABLE;
+			rd->rpl[0].name = pl1_name;
+			break;
+		case BIT(RAPL_DOMAIN_DRAM):
+			rd->name = rapl_domain_names[RAPL_DOMAIN_DRAM];
+			rd->id = RAPL_DOMAIN_DRAM;
+			rd->rpl[0].prim_id = PL1_ENABLE;
+			rd->rpl[0].name = pl1_name;
+			rd->domain_energy_unit =
+			    rapl_defaults->dram_domain_energy_unit;
+			if (rd->domain_energy_unit)
+				pr_info("DRAM domain energy unit %dpj\n",
+					rd->domain_energy_unit);
+			break;
+		}
+		if (mask) {
+			rd->rp = rp;
+			rd++;
+		}
+	}
+}
+
+static u64 rapl_unit_xlate(struct rapl_domain *rd, enum unit_type type,
+			   u64 value, int to_raw)
+{
+	u64 units = 1;
+	struct rapl_package *rp = rd->rp;
+	u64 scale = 1;
+
+	switch (type) {
+	case POWER_UNIT:
+		units = rp->power_unit;
+		break;
+	case ENERGY_UNIT:
+		scale = ENERGY_UNIT_SCALE;
+		/* per domain unit takes precedence */
+		if (rd->domain_energy_unit)
+			units = rd->domain_energy_unit;
+		else
+			units = rp->energy_unit;
+		break;
+	case TIME_UNIT:
+		return rapl_defaults->compute_time_window(rp, value, to_raw);
+	case ARBITRARY_UNIT:
+	default:
+		return value;
+	};
+
+	if (to_raw)
+		return div64_u64(value, units) * scale;
+
+	value *= units;
+
+	return div64_u64(value, scale);
+}
+
+/* in the order of enum rapl_primitives */
+static struct rapl_primitive_info rpi[] = {
+	/* name, mask, shift, msr index, unit divisor */
+	PRIMITIVE_INFO_INIT(ENERGY_COUNTER, ENERGY_STATUS_MASK, 0,
+			    RAPL_DOMAIN_REG_STATUS, ENERGY_UNIT, 0),
+	PRIMITIVE_INFO_INIT(POWER_LIMIT1, POWER_LIMIT1_MASK, 0,
+			    RAPL_DOMAIN_REG_LIMIT, POWER_UNIT, 0),
+	PRIMITIVE_INFO_INIT(POWER_LIMIT2, POWER_LIMIT2_MASK, 32,
+			    RAPL_DOMAIN_REG_LIMIT, POWER_UNIT, 0),
+	PRIMITIVE_INFO_INIT(FW_LOCK, POWER_PP_LOCK, 31,
+			    RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
+	PRIMITIVE_INFO_INIT(PL1_ENABLE, POWER_LIMIT1_ENABLE, 15,
+			    RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
+	PRIMITIVE_INFO_INIT(PL1_CLAMP, POWER_LIMIT1_CLAMP, 16,
+			    RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
+	PRIMITIVE_INFO_INIT(PL2_ENABLE, POWER_LIMIT2_ENABLE, 47,
+			    RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
+	PRIMITIVE_INFO_INIT(PL2_CLAMP, POWER_LIMIT2_CLAMP, 48,
+			    RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
+	PRIMITIVE_INFO_INIT(TIME_WINDOW1, TIME_WINDOW1_MASK, 17,
+			    RAPL_DOMAIN_REG_LIMIT, TIME_UNIT, 0),
+	PRIMITIVE_INFO_INIT(TIME_WINDOW2, TIME_WINDOW2_MASK, 49,
+			    RAPL_DOMAIN_REG_LIMIT, TIME_UNIT, 0),
+	PRIMITIVE_INFO_INIT(THERMAL_SPEC_POWER, POWER_INFO_THERMAL_SPEC_MASK,
+			    0, RAPL_DOMAIN_REG_INFO, POWER_UNIT, 0),
+	PRIMITIVE_INFO_INIT(MAX_POWER, POWER_INFO_MAX_MASK, 32,
+			    RAPL_DOMAIN_REG_INFO, POWER_UNIT, 0),
+	PRIMITIVE_INFO_INIT(MIN_POWER, POWER_INFO_MIN_MASK, 16,
+			    RAPL_DOMAIN_REG_INFO, POWER_UNIT, 0),
+	PRIMITIVE_INFO_INIT(MAX_TIME_WINDOW, POWER_INFO_MAX_TIME_WIN_MASK, 48,
+			    RAPL_DOMAIN_REG_INFO, TIME_UNIT, 0),
+	PRIMITIVE_INFO_INIT(THROTTLED_TIME, PERF_STATUS_THROTTLE_TIME_MASK, 0,
+			    RAPL_DOMAIN_REG_PERF, TIME_UNIT, 0),
+	PRIMITIVE_INFO_INIT(PRIORITY_LEVEL, PP_POLICY_MASK, 0,
+			    RAPL_DOMAIN_REG_POLICY, ARBITRARY_UNIT, 0),
+	/* non-hardware */
+	PRIMITIVE_INFO_INIT(AVERAGE_POWER, 0, 0, 0, POWER_UNIT,
+			    RAPL_PRIMITIVE_DERIVED),
+	{NULL, 0, 0, 0},
+};
+
+/* Read primitive data based on its related struct rapl_primitive_info.
+ * if xlate flag is set, return translated data based on data units, i.e.
+ * time, energy, and power.
+ * RAPL MSRs are non-architectual and are laid out not consistently across
+ * domains. Here we use primitive info to allow writing consolidated access
+ * functions.
+ * For a given primitive, it is processed by MSR mask and shift. Unit conversion
+ * is pre-assigned based on RAPL unit MSRs read at init time.
+ * 63-------------------------- 31--------------------------- 0
+ * |                           xxxxx (mask)                   |
+ * |                                |<- shift ----------------|
+ * 63-------------------------- 31--------------------------- 0
+ */
+static int rapl_read_data_raw(struct rapl_domain *rd,
+			      enum rapl_primitives prim, bool xlate, u64 *data)
+{
+	u64 value;
+	struct rapl_primitive_info *rp = &rpi[prim];
+	struct reg_action ra;
+	int cpu;
+
+	if (!rp->name || rp->flag & RAPL_PRIMITIVE_DUMMY)
+		return -EINVAL;
+
+	ra.reg = rd->regs[rp->id];
+	if (!ra.reg)
+		return -EINVAL;
+
+	cpu = rd->rp->lead_cpu;
+
+	/* special-case package domain, which uses a different bit */
+	if (prim == FW_LOCK && rd->id == RAPL_DOMAIN_PACKAGE) {
+		rp->mask = POWER_PACKAGE_LOCK;
+		rp->shift = 63;
+	}
+	/* non-hardware data are collected by the polling thread */
+	if (rp->flag & RAPL_PRIMITIVE_DERIVED) {
+		*data = rd->rdd.primitives[prim];
+		return 0;
+	}
+
+	ra.mask = rp->mask;
+
+	if (rd->rp->priv->read_raw(cpu, &ra)) {
+		pr_debug("failed to read reg 0x%x on cpu %d\n", ra.reg, cpu);
+		return -EIO;
+	}
+
+	value = ra.value >> rp->shift;
+
+	if (xlate)
+		*data = rapl_unit_xlate(rd, rp->unit, value, 0);
+	else
+		*data = value;
+
+	return 0;
+}
+
+/* Similar use of primitive info in the read counterpart */
+static int rapl_write_data_raw(struct rapl_domain *rd,
+			       enum rapl_primitives prim,
+			       unsigned long long value)
+{
+	struct rapl_primitive_info *rp = &rpi[prim];
+	int cpu;
+	u64 bits;
+	struct reg_action ra;
+	int ret;
+
+	cpu = rd->rp->lead_cpu;
+	bits = rapl_unit_xlate(rd, rp->unit, value, 1);
+	bits <<= rp->shift;
+	bits &= rp->mask;
+
+	memset(&ra, 0, sizeof(ra));
+
+	ra.reg = rd->regs[rp->id];
+	ra.mask = rp->mask;
+	ra.value = bits;
+
+	ret = rd->rp->priv->write_raw(cpu, &ra);
+
+	return ret;
+}
+
+/*
+ * Raw RAPL data stored in MSRs are in certain scales. We need to
+ * convert them into standard units based on the units reported in
+ * the RAPL unit MSRs. This is specific to CPUs as the method to
+ * calculate units differ on different CPUs.
+ * We convert the units to below format based on CPUs.
+ * i.e.
+ * energy unit: picoJoules  : Represented in picoJoules by default
+ * power unit : microWatts  : Represented in milliWatts by default
+ * time unit  : microseconds: Represented in seconds by default
+ */
+static int rapl_check_unit_core(struct rapl_package *rp, int cpu)
+{
+	struct reg_action ra;
+	u32 value;
+
+	ra.reg = rp->priv->reg_unit;
+	ra.mask = ~0;
+	if (rp->priv->read_raw(cpu, &ra)) {
+		pr_err("Failed to read power unit REG 0x%x on CPU %d, exit.\n",
+		       rp->priv->reg_unit, cpu);
+		return -ENODEV;
+	}
+
+	value = (ra.value & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET;
+	rp->energy_unit = ENERGY_UNIT_SCALE * 1000000 / (1 << value);
+
+	value = (ra.value & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET;
+	rp->power_unit = 1000000 / (1 << value);
+
+	value = (ra.value & TIME_UNIT_MASK) >> TIME_UNIT_OFFSET;
+	rp->time_unit = 1000000 / (1 << value);
+
+	pr_debug("Core CPU %s energy=%dpJ, time=%dus, power=%duW\n",
+		 rp->name, rp->energy_unit, rp->time_unit, rp->power_unit);
+
+	return 0;
+}
+
+static int rapl_check_unit_atom(struct rapl_package *rp, int cpu)
+{
+	struct reg_action ra;
+	u32 value;
+
+	ra.reg = rp->priv->reg_unit;
+	ra.mask = ~0;
+	if (rp->priv->read_raw(cpu, &ra)) {
+		pr_err("Failed to read power unit REG 0x%x on CPU %d, exit.\n",
+		       rp->priv->reg_unit, cpu);
+		return -ENODEV;
+	}
+
+	value = (ra.value & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET;
+	rp->energy_unit = ENERGY_UNIT_SCALE * 1 << value;
+
+	value = (ra.value & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET;
+	rp->power_unit = (1 << value) * 1000;
+
+	value = (ra.value & TIME_UNIT_MASK) >> TIME_UNIT_OFFSET;
+	rp->time_unit = 1000000 / (1 << value);
+
+	pr_debug("Atom %s energy=%dpJ, time=%dus, power=%duW\n",
+		 rp->name, rp->energy_unit, rp->time_unit, rp->power_unit);
+
+	return 0;
+}
+
+static void power_limit_irq_save_cpu(void *info)
+{
+	u32 l, h = 0;
+	struct rapl_package *rp = (struct rapl_package *)info;
+
+	/* save the state of PLN irq mask bit before disabling it */
+	rdmsr_safe(MSR_IA32_PACKAGE_THERM_INTERRUPT, &l, &h);
+	if (!(rp->power_limit_irq & PACKAGE_PLN_INT_SAVED)) {
+		rp->power_limit_irq = l & PACKAGE_THERM_INT_PLN_ENABLE;
+		rp->power_limit_irq |= PACKAGE_PLN_INT_SAVED;
+	}
+	l &= ~PACKAGE_THERM_INT_PLN_ENABLE;
+	wrmsr_safe(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
+}
+
+/* REVISIT:
+ * When package power limit is set artificially low by RAPL, LVT
+ * thermal interrupt for package power limit should be ignored
+ * since we are not really exceeding the real limit. The intention
+ * is to avoid excessive interrupts while we are trying to save power.
+ * A useful feature might be routing the package_power_limit interrupt
+ * to userspace via eventfd. once we have a usecase, this is simple
+ * to do by adding an atomic notifier.
+ */
+
+static void package_power_limit_irq_save(struct rapl_package *rp)
+{
+	if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN))
+		return;
+
+	smp_call_function_single(rp->lead_cpu, power_limit_irq_save_cpu, rp, 1);
+}
+
+/*
+ * Restore per package power limit interrupt enable state. Called from cpu
+ * hotplug code on package removal.
+ */
+static void package_power_limit_irq_restore(struct rapl_package *rp)
+{
+	u32 l, h;
+
+	if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN))
+		return;
+
+	/* irq enable state not saved, nothing to restore */
+	if (!(rp->power_limit_irq & PACKAGE_PLN_INT_SAVED))
+		return;
+
+	rdmsr_safe(MSR_IA32_PACKAGE_THERM_INTERRUPT, &l, &h);
+
+	if (rp->power_limit_irq & PACKAGE_THERM_INT_PLN_ENABLE)
+		l |= PACKAGE_THERM_INT_PLN_ENABLE;
+	else
+		l &= ~PACKAGE_THERM_INT_PLN_ENABLE;
+
+	wrmsr_safe(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
+}
+
+static void set_floor_freq_default(struct rapl_domain *rd, bool mode)
+{
+	int nr_powerlimit = find_nr_power_limit(rd);
+
+	/* always enable clamp such that p-state can go below OS requested
+	 * range. power capping priority over guranteed frequency.
+	 */
+	rapl_write_data_raw(rd, PL1_CLAMP, mode);
+
+	/* some domains have pl2 */
+	if (nr_powerlimit > 1) {
+		rapl_write_data_raw(rd, PL2_ENABLE, mode);
+		rapl_write_data_raw(rd, PL2_CLAMP, mode);
+	}
+}
+
+static void set_floor_freq_atom(struct rapl_domain *rd, bool enable)
+{
+	static u32 power_ctrl_orig_val;
+	u32 mdata;
+
+	if (!rapl_defaults->floor_freq_reg_addr) {
+		pr_err("Invalid floor frequency config register\n");
+		return;
+	}
+
+	if (!power_ctrl_orig_val)
+		iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_CR_READ,
+			      rapl_defaults->floor_freq_reg_addr,
+			      &power_ctrl_orig_val);
+	mdata = power_ctrl_orig_val;
+	if (enable) {
+		mdata &= ~(0x7f << 8);
+		mdata |= 1 << 8;
+	}
+	iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_CR_WRITE,
+		       rapl_defaults->floor_freq_reg_addr, mdata);
+}
+
+static u64 rapl_compute_time_window_core(struct rapl_package *rp, u64 value,
+					 bool to_raw)
+{
+	u64 f, y;		/* fraction and exp. used for time unit */
+
+	/*
+	 * Special processing based on 2^Y*(1+F/4), refer
+	 * to Intel Software Developer's manual Vol.3B: CH 14.9.3.
+	 */
+	if (!to_raw) {
+		f = (value & 0x60) >> 5;
+		y = value & 0x1f;
+		value = (1 << y) * (4 + f) * rp->time_unit / 4;
+	} else {
+		do_div(value, rp->time_unit);
+		y = ilog2(value);
+		f = div64_u64(4 * (value - (1 << y)), 1 << y);
+		value = (y & 0x1f) | ((f & 0x3) << 5);
+	}
+	return value;
+}
+
+static u64 rapl_compute_time_window_atom(struct rapl_package *rp, u64 value,
+					 bool to_raw)
+{
+	/*
+	 * Atom time unit encoding is straight forward val * time_unit,
+	 * where time_unit is default to 1 sec. Never 0.
+	 */
+	if (!to_raw)
+		return (value) ? value *= rp->time_unit : rp->time_unit;
+
+	value = div64_u64(value, rp->time_unit);
+
+	return value;
+}
+
+static const struct rapl_defaults rapl_defaults_core = {
+	.floor_freq_reg_addr = 0,
+	.check_unit = rapl_check_unit_core,
+	.set_floor_freq = set_floor_freq_default,
+	.compute_time_window = rapl_compute_time_window_core,
+};
+
+static const struct rapl_defaults rapl_defaults_hsw_server = {
+	.check_unit = rapl_check_unit_core,
+	.set_floor_freq = set_floor_freq_default,
+	.compute_time_window = rapl_compute_time_window_core,
+	.dram_domain_energy_unit = 15300,
+};
+
+static const struct rapl_defaults rapl_defaults_byt = {
+	.floor_freq_reg_addr = IOSF_CPU_POWER_BUDGET_CTL_BYT,
+	.check_unit = rapl_check_unit_atom,
+	.set_floor_freq = set_floor_freq_atom,
+	.compute_time_window = rapl_compute_time_window_atom,
+};
+
+static const struct rapl_defaults rapl_defaults_tng = {
+	.floor_freq_reg_addr = IOSF_CPU_POWER_BUDGET_CTL_TNG,
+	.check_unit = rapl_check_unit_atom,
+	.set_floor_freq = set_floor_freq_atom,
+	.compute_time_window = rapl_compute_time_window_atom,
+};
+
+static const struct rapl_defaults rapl_defaults_ann = {
+	.floor_freq_reg_addr = 0,
+	.check_unit = rapl_check_unit_atom,
+	.set_floor_freq = NULL,
+	.compute_time_window = rapl_compute_time_window_atom,
+};
+
+static const struct rapl_defaults rapl_defaults_cht = {
+	.floor_freq_reg_addr = 0,
+	.check_unit = rapl_check_unit_atom,
+	.set_floor_freq = NULL,
+	.compute_time_window = rapl_compute_time_window_atom,
+};
+
+static const struct x86_cpu_id rapl_ids[] = {
+	INTEL_CPU_FAM6(SANDYBRIDGE, rapl_defaults_core),
+	INTEL_CPU_FAM6(SANDYBRIDGE_X, rapl_defaults_core),
+
+	INTEL_CPU_FAM6(IVYBRIDGE, rapl_defaults_core),
+	INTEL_CPU_FAM6(IVYBRIDGE_X, rapl_defaults_core),
+
+	INTEL_CPU_FAM6(HASWELL_CORE, rapl_defaults_core),
+	INTEL_CPU_FAM6(HASWELL_ULT, rapl_defaults_core),
+	INTEL_CPU_FAM6(HASWELL_GT3E, rapl_defaults_core),
+	INTEL_CPU_FAM6(HASWELL_X, rapl_defaults_hsw_server),
+
+	INTEL_CPU_FAM6(BROADWELL_CORE, rapl_defaults_core),
+	INTEL_CPU_FAM6(BROADWELL_GT3E, rapl_defaults_core),
+	INTEL_CPU_FAM6(BROADWELL_XEON_D, rapl_defaults_core),
+	INTEL_CPU_FAM6(BROADWELL_X, rapl_defaults_hsw_server),
+
+	INTEL_CPU_FAM6(SKYLAKE_DESKTOP, rapl_defaults_core),
+	INTEL_CPU_FAM6(SKYLAKE_MOBILE, rapl_defaults_core),
+	INTEL_CPU_FAM6(SKYLAKE_X, rapl_defaults_hsw_server),
+	INTEL_CPU_FAM6(KABYLAKE_MOBILE, rapl_defaults_core),
+	INTEL_CPU_FAM6(KABYLAKE_DESKTOP, rapl_defaults_core),
+	INTEL_CPU_FAM6(CANNONLAKE_MOBILE, rapl_defaults_core),
+	INTEL_CPU_FAM6(ICELAKE_MOBILE, rapl_defaults_core),
+
+	INTEL_CPU_FAM6(ATOM_SILVERMONT, rapl_defaults_byt),
+	INTEL_CPU_FAM6(ATOM_AIRMONT, rapl_defaults_cht),
+	INTEL_CPU_FAM6(ATOM_SILVERMONT_MID, rapl_defaults_tng),
+	INTEL_CPU_FAM6(ATOM_AIRMONT_MID, rapl_defaults_ann),
+	INTEL_CPU_FAM6(ATOM_GOLDMONT, rapl_defaults_core),
+	INTEL_CPU_FAM6(ATOM_GOLDMONT_PLUS, rapl_defaults_core),
+	INTEL_CPU_FAM6(ATOM_GOLDMONT_X, rapl_defaults_core),
+	INTEL_CPU_FAM6(ATOM_TREMONT_X, rapl_defaults_core),
+
+	INTEL_CPU_FAM6(XEON_PHI_KNL, rapl_defaults_hsw_server),
+	INTEL_CPU_FAM6(XEON_PHI_KNM, rapl_defaults_hsw_server),
+	{}
+};
+
+MODULE_DEVICE_TABLE(x86cpu, rapl_ids);
+
+/* Read once for all raw primitive data for domains */
+static void rapl_update_domain_data(struct rapl_package *rp)
+{
+	int dmn, prim;
+	u64 val;
+
+	for (dmn = 0; dmn < rp->nr_domains; dmn++) {
+		pr_debug("update %s domain %s data\n", rp->name,
+			 rp->domains[dmn].name);
+		/* exclude non-raw primitives */
+		for (prim = 0; prim < NR_RAW_PRIMITIVES; prim++) {
+			if (!rapl_read_data_raw(&rp->domains[dmn], prim,
+						rpi[prim].unit, &val))
+				rp->domains[dmn].rdd.primitives[prim] = val;
+		}
+	}
+
+}
+
+static int rapl_package_register_powercap(struct rapl_package *rp)
+{
+	struct rapl_domain *rd;
+	struct powercap_zone *power_zone = NULL;
+	int nr_pl, ret;
+
+	/* Update the domain data of the new package */
+	rapl_update_domain_data(rp);
+
+	/* first we register package domain as the parent zone */
+	for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) {
+		if (rd->id == RAPL_DOMAIN_PACKAGE) {
+			nr_pl = find_nr_power_limit(rd);
+			pr_debug("register package domain %s\n", rp->name);
+			power_zone = powercap_register_zone(&rd->power_zone,
+					    rp->priv->control_type, rp->name,
+					    NULL, &zone_ops[rd->id], nr_pl,
+					    &constraint_ops);
+			if (IS_ERR(power_zone)) {
+				pr_debug("failed to register power zone %s\n",
+					 rp->name);
+				return PTR_ERR(power_zone);
+			}
+			/* track parent zone in per package/socket data */
+			rp->power_zone = power_zone;
+			/* done, only one package domain per socket */
+			break;
+		}
+	}
+	if (!power_zone) {
+		pr_err("no package domain found, unknown topology!\n");
+		return -ENODEV;
+	}
+	/* now register domains as children of the socket/package */
+	for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) {
+		if (rd->id == RAPL_DOMAIN_PACKAGE)
+			continue;
+		/* 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,
+						    &zone_ops[rd->id], nr_pl,
+						    &constraint_ops);
+
+		if (IS_ERR(power_zone)) {
+			pr_debug("failed to register power_zone, %s:%s\n",
+				 rp->name, rd->name);
+			ret = PTR_ERR(power_zone);
+			goto err_cleanup;
+		}
+	}
+	return 0;
+
+err_cleanup:
+	/*
+	 * Clean up previously initialized domains within the package if we
+	 * failed after the first domain setup.
+	 */
+	while (--rd >= rp->domains) {
+		pr_debug("unregister %s domain %s\n", rp->name, rd->name);
+		powercap_unregister_zone(rp->priv->control_type,
+					 &rd->power_zone);
+	}
+
+	return ret;
+}
+
+int rapl_add_platform_domain(struct rapl_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_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;
+
+	switch (domain) {
+	case RAPL_DOMAIN_PACKAGE:
+	case RAPL_DOMAIN_PP0:
+	case RAPL_DOMAIN_PP1:
+	case RAPL_DOMAIN_DRAM:
+		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;
+	}
+	/* make sure domain counters are available and contains non-zero
+	 * values, otherwise skip it.
+	 */
+
+	ra.mask = ~0;
+	if (rp->priv->read_raw(cpu, &ra) || !ra.value)
+		return -ENODEV;
+
+	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 constraints 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 %s domain %s locked by BIOS\n",
+				rd->rp->name, rd->name);
+			rd->state |= DOMAIN_STATE_BIOS_LOCKED;
+		}
+	}
+	/* check if power limit MSR 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.
+ */
+static int rapl_detect_domains(struct rapl_package *rp, int cpu)
+{
+	struct rapl_domain *rd;
+	int i;
+
+	for (i = 0; i < RAPL_DOMAIN_MAX; i++) {
+		/* use physical package id to read counters */
+		if (!rapl_check_domain(cpu, i, rp)) {
+			rp->domain_map |= 1 << i;
+			pr_info("Found RAPL domain %s\n", rapl_domain_names[i]);
+		}
+	}
+	rp->nr_domains = bitmap_weight(&rp->domain_map, RAPL_DOMAIN_MAX);
+	if (!rp->nr_domains) {
+		pr_debug("no valid rapl domains found in %s\n", rp->name);
+		return -ENODEV;
+	}
+	pr_debug("found %d domains on %s\n", rp->nr_domains, rp->name);
+
+	rp->domains = kcalloc(rp->nr_domains + 1, sizeof(struct rapl_domain),
+			      GFP_KERNEL);
+	if (!rp->domains)
+		return -ENOMEM;
+
+	rapl_init_domains(rp);
+
+	for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++)
+		rapl_detect_powerlimit(rd);
+
+	return 0;
+}
+
+/* called from CPU hotplug notifier, hotplug lock held */
+void rapl_remove_package(struct rapl_package *rp)
+{
+	struct rapl_domain *rd, *rd_package = NULL;
+
+	package_power_limit_irq_restore(rp);
+
+	for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) {
+		rapl_write_data_raw(rd, PL1_ENABLE, 0);
+		rapl_write_data_raw(rd, PL1_CLAMP, 0);
+		if (find_nr_power_limit(rd) > 1) {
+			rapl_write_data_raw(rd, PL2_ENABLE, 0);
+			rapl_write_data_raw(rd, PL2_CLAMP, 0);
+		}
+		if (rd->id == RAPL_DOMAIN_PACKAGE) {
+			rd_package = rd;
+			continue;
+		}
+		pr_debug("remove package, undo power limit on %s: %s\n",
+			 rp->name, rd->name);
+		powercap_unregister_zone(rp->priv->control_type,
+					 &rd->power_zone);
+	}
+	/* do parent zone last */
+	powercap_unregister_zone(rp->priv->control_type,
+				 &rd_package->power_zone);
+	list_del(&rp->plist);
+	if (list_empty(&rapl_packages))
+		rapl_remove_core();
+	kfree(rp);
+}
+EXPORT_SYMBOL_GPL(rapl_remove_package);
+
+/* caller to ensure CPU hotplug lock is held */
+struct rapl_package *rapl_find_package_domain(int cpu, struct rapl_priv *priv)
+{
+	int id = topology_logical_die_id(cpu);
+	struct rapl_package *rp;
+
+	list_for_each_entry(rp, &rapl_packages, plist) {
+		if (rp->id == id
+		    && rp->priv->control_type == priv->control_type)
+			return rp;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(rapl_find_package_domain);
+
+/* called from CPU hotplug notifier, hotplug lock held */
+struct rapl_package *rapl_add_package(int cpu, struct rapl_priv *priv)
+{
+	int id = topology_logical_die_id(cpu);
+	struct rapl_package *rp;
+	struct cpuinfo_x86 *c = &cpu_data(cpu);
+	int ret;
+
+	ret = rapl_init_core();
+	if (ret)
+		return ERR_PTR(ret);
+
+	rp = kzalloc(sizeof(struct rapl_package), GFP_KERNEL);
+	if (!rp)
+		return ERR_PTR(-ENOMEM);
+
+	/* add the new package to the list */
+	rp->id = id;
+	rp->lead_cpu = cpu;
+	rp->priv = priv;
+
+	if (topology_max_die_per_package() > 1)
+		snprintf(rp->name, PACKAGE_DOMAIN_NAME_LENGTH,
+			 "package-%d-die-%d", c->phys_proc_id, c->cpu_die_id);
+	else
+		snprintf(rp->name, PACKAGE_DOMAIN_NAME_LENGTH, "package-%d",
+			 c->phys_proc_id);
+
+	/* check if the package contains valid domains */
+	if (rapl_detect_domains(rp, cpu) || rapl_defaults->check_unit(rp, cpu)) {
+		ret = -ENODEV;
+		goto err_free_package;
+	}
+	ret = rapl_package_register_powercap(rp);
+	if (!ret) {
+		INIT_LIST_HEAD(&rp->plist);
+		list_add(&rp->plist, &rapl_packages);
+		return rp;
+	}
+
+err_free_package:
+	kfree(rp->domains);
+	kfree(rp);
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(rapl_add_package);
+
+static void power_limit_state_save(void)
+{
+	struct rapl_package *rp;
+	struct rapl_domain *rd;
+	int nr_pl, ret, i;
+
+	get_online_cpus();
+	list_for_each_entry(rp, &rapl_packages, plist) {
+		if (!rp->power_zone)
+			continue;
+		rd = power_zone_to_rapl_domain(rp->power_zone);
+		nr_pl = find_nr_power_limit(rd);
+		for (i = 0; i < nr_pl; i++) {
+			switch (rd->rpl[i].prim_id) {
+			case PL1_ENABLE:
+				ret = rapl_read_data_raw(rd,
+						 POWER_LIMIT1, true,
+						 &rd->rpl[i].last_power_limit);
+				if (ret)
+					rd->rpl[i].last_power_limit = 0;
+				break;
+			case PL2_ENABLE:
+				ret = rapl_read_data_raw(rd,
+						 POWER_LIMIT2, true,
+						 &rd->rpl[i].last_power_limit);
+				if (ret)
+					rd->rpl[i].last_power_limit = 0;
+				break;
+			}
+		}
+	}
+	put_online_cpus();
+}
+
+static void power_limit_state_restore(void)
+{
+	struct rapl_package *rp;
+	struct rapl_domain *rd;
+	int nr_pl, i;
+
+	get_online_cpus();
+	list_for_each_entry(rp, &rapl_packages, plist) {
+		if (!rp->power_zone)
+			continue;
+		rd = power_zone_to_rapl_domain(rp->power_zone);
+		nr_pl = find_nr_power_limit(rd);
+		for (i = 0; i < nr_pl; i++) {
+			switch (rd->rpl[i].prim_id) {
+			case PL1_ENABLE:
+				if (rd->rpl[i].last_power_limit)
+					rapl_write_data_raw(rd, POWER_LIMIT1,
+					    rd->rpl[i].last_power_limit);
+				break;
+			case PL2_ENABLE:
+				if (rd->rpl[i].last_power_limit)
+					rapl_write_data_raw(rd, POWER_LIMIT2,
+					    rd->rpl[i].last_power_limit);
+				break;
+			}
+		}
+	}
+	put_online_cpus();
+}
+
+static int rapl_pm_callback(struct notifier_block *nb,
+			    unsigned long mode, void *_unused)
+{
+	switch (mode) {
+	case PM_SUSPEND_PREPARE:
+		power_limit_state_save();
+		break;
+	case PM_POST_SUSPEND:
+		power_limit_state_restore();
+		break;
+	}
+	return NOTIFY_OK;
+}
+
+static struct notifier_block rapl_pm_notifier = {
+	.notifier_call = rapl_pm_callback,
+};
+
+static int rapl_init_core(void)
+{
+	const struct x86_cpu_id *id;
+	int ret;
+
+	if (rapl_defaults)
+		return 0;
+
+	id = x86_match_cpu(rapl_ids);
+	if (!id) {
+		pr_err("driver does not support CPU family %d model %d\n",
+		       boot_cpu_data.x86, boot_cpu_data.x86_model);
+
+		return -ENODEV;
+	}
+
+	rapl_defaults = (struct rapl_defaults *)id->driver_data;
+
+	ret = register_pm_notifier(&rapl_pm_notifier);
+
+	return 0;
+}
+
+static void rapl_remove_core(void)
+{
+	unregister_pm_notifier(&rapl_pm_notifier);
+	rapl_defaults = NULL;
+}
+
+MODULE_DESCRIPTION("Runtime Average Power Limit (RAPL) core");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/intel_rapl.h b/include/linux/intel_rapl.h
index 1a0df65..e83739f 100644
--- a/include/linux/intel_rapl.h
+++ b/include/linux/intel_rapl.h
@@ -128,4 +128,11 @@ struct rapl_package {
 	struct rapl_priv *priv;
 };
 
+struct rapl_package *rapl_find_package_domain(int cpu, struct rapl_priv *priv);
+struct rapl_package *rapl_add_package(int cpu, struct rapl_priv *priv);
+void rapl_remove_package(struct rapl_package *rp);
+
+int rapl_add_platform_domain(struct rapl_priv *priv);
+void rapl_remove_platform_domain(struct rapl_priv *priv);
+
 #endif /* __INTEL_RAPL_H__ */
-- 
2.7.4

[PATCH 10/13] intel_rapl: support 64 bit register

[Zhang Rui]

RAPL MMIO interface uses 64 bit registers, thus force use 64 bit register
for all the RAPL code.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
 drivers/powercap/intel_rapl.c        | 11 +++++++----
 drivers/powercap/intel_rapl_common.c |  6 +++---
 include/linux/intel_rapl.h           |  8 ++++----
 3 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index 67130c4..8868624 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -83,8 +83,10 @@ static int rapl_cpu_down_prep(unsigned int cpu)
 
 static int rapl_msr_read_raw(int cpu, struct reg_action *ra)
 {
-	if (rdmsrl_safe_on_cpu(cpu, ra->reg, &ra->value)) {
-		pr_debug("failed to read msr 0x%x on cpu %d\n", ra->reg, cpu);
+	u32 msr = (u32)ra->reg;
+
+	if (rdmsrl_safe_on_cpu(cpu, msr, &ra->value)) {
+		pr_debug("failed to read msr 0x%x on cpu %d\n", msr, cpu);
 		return -EIO;
 	}
 	ra->value &= ra->mask;
@@ -94,16 +96,17 @@ static int rapl_msr_read_raw(int cpu, struct reg_action *ra)
 static void rapl_msr_update_func(void *info)
 {
 	struct reg_action *ra = info;
+	u32 msr = (u32)ra->reg;
 	u64 val;
 
-	ra->err = rdmsrl_safe(ra->reg, &val);
+	ra->err = rdmsrl_safe(msr, &val);
 	if (ra->err)
 		return;
 
 	val &= ~ra->mask;
 	val |= ra->value;
 
-	ra->err = wrmsrl_safe(ra->reg, val);
+	ra->err = wrmsrl_safe(msr, val);
 }
 
 static int rapl_msr_write_raw(int cpu, struct reg_action *ra)
diff --git a/drivers/powercap/intel_rapl_common.c b/drivers/powercap/intel_rapl_common.c
index 8f589cf..f11bac7 100644
--- a/drivers/powercap/intel_rapl_common.c
+++ b/drivers/powercap/intel_rapl_common.c
@@ -689,7 +689,7 @@ static int rapl_read_data_raw(struct rapl_domain *rd,
 	ra.mask = rp->mask;
 
 	if (rd->rp->priv->read_raw(cpu, &ra)) {
-		pr_debug("failed to read reg 0x%x on cpu %d\n", ra.reg, cpu);
+		pr_debug("failed to read reg 0x%llx on cpu %d\n", ra.reg, cpu);
 		return -EIO;
 	}
 
@@ -749,7 +749,7 @@ static int rapl_check_unit_core(struct rapl_package *rp, int cpu)
 	ra.reg = rp->priv->reg_unit;
 	ra.mask = ~0;
 	if (rp->priv->read_raw(cpu, &ra)) {
-		pr_err("Failed to read power unit REG 0x%x on CPU %d, exit.\n",
+		pr_err("Failed to read power unit REG 0x%llx on CPU %d, exit.\n",
 		       rp->priv->reg_unit, cpu);
 		return -ENODEV;
 	}
@@ -777,7 +777,7 @@ static int rapl_check_unit_atom(struct rapl_package *rp, int cpu)
 	ra.reg = rp->priv->reg_unit;
 	ra.mask = ~0;
 	if (rp->priv->read_raw(cpu, &ra)) {
-		pr_err("Failed to read power unit REG 0x%x on CPU %d, exit.\n",
+		pr_err("Failed to read power unit REG 0x%llx on CPU %d, exit.\n",
 		       rp->priv->reg_unit, cpu);
 		return -ENODEV;
 	}
diff --git a/include/linux/intel_rapl.h b/include/linux/intel_rapl.h
index e83739f..1ca0f69 100644
--- a/include/linux/intel_rapl.h
+++ b/include/linux/intel_rapl.h
@@ -78,7 +78,7 @@ struct rapl_package;
 struct rapl_domain {
 	const char *name;
 	enum rapl_domain_type id;
-	int regs[RAPL_DOMAIN_REG_MAX];
+	u64 regs[RAPL_DOMAIN_REG_MAX];
 	struct powercap_zone power_zone;
 	struct rapl_domain_data rdd;
 	struct rapl_power_limit rpl[NR_POWER_LIMITS];
@@ -89,7 +89,7 @@ struct rapl_domain {
 };
 
 struct reg_action {
-	u32 reg;
+	u64 reg;
 	u64 mask;
 	u64 value;
 	int err;
@@ -99,8 +99,8 @@ struct rapl_priv {
 	struct powercap_control_type *control_type;
 	struct rapl_domain *platform_rapl_domain;
 	enum cpuhp_state pcap_rapl_online;
-	u32 reg_unit;
-	u32 regs[RAPL_DOMAIN_MAX][RAPL_DOMAIN_REG_MAX];
+	u64 reg_unit;
+	u64 regs[RAPL_DOMAIN_MAX][RAPL_DOMAIN_REG_MAX];
 	int (*read_raw)(int cpu, struct reg_action *ra);
 	int (*write_raw)(int cpu, struct reg_action *ra);
 };
-- 
2.7.4

[PATCH 11/13] intel_rapl: support two power limits for every RAPL domain

[Zhang Rui]

RAPL MSR interface supports 2 power limits for package domain, and 1 power
limit for other domains, while RAPL MMIO interface supports 2 power limits
for both package and dram domains.
And when 2 power limits are supported, the FW_LOCK bit is in bit 63 of the
register, instead of bit 31.

Remove the assumption that only pakcage domain supports 2 power limits.
And allow the RAPL interface driver to specify the number of power limits
supported, for every single RAPL domain it owns..

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
 drivers/powercap/intel_rapl.c        |  1 +
 drivers/powercap/intel_rapl_common.c | 72 +++++++++++++-----------------------
 include/linux/intel_rapl.h           |  1 +
 3 files changed, 27 insertions(+), 47 deletions(-)

diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index 8868624..ce0948a 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -40,6 +40,7 @@ static struct rapl_priv rapl_msr_priv = {
 		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,
 };
 
 /* Handles CPU hotplug on multi-socket systems.
diff --git a/drivers/powercap/intel_rapl_common.c b/drivers/powercap/intel_rapl_common.c
index f11bac7..ef6a9d0 100644
--- a/drivers/powercap/intel_rapl_common.c
+++ b/drivers/powercap/intel_rapl_common.c
@@ -38,8 +38,8 @@
 #define POWER_LIMIT2_MASK       (0x7FFFULL<<32)
 #define POWER_LIMIT2_ENABLE     BIT_ULL(47)
 #define POWER_LIMIT2_CLAMP      BIT_ULL(48)
-#define POWER_PACKAGE_LOCK      BIT_ULL(63)
-#define POWER_PP_LOCK           BIT(31)
+#define POWER_HIGH_LOCK         BIT_ULL(63)
+#define POWER_LOW_LOCK          BIT(31)
 
 #define TIME_WINDOW1_MASK       (0x7FULL<<17)
 #define TIME_WINDOW2_MASK       (0x7FULL<<49)
@@ -513,60 +513,38 @@ static const struct powercap_zone_constraint_ops constraint_ops = {
 /* called after domain detection and package level data are set */
 static void rapl_init_domains(struct rapl_package *rp)
 {
-	int i;
+	enum rapl_domain_type i;
+	enum rapl_domain_reg_id j;
 	struct rapl_domain *rd = rp->domains;
 
 	for (i = 0; i < RAPL_DOMAIN_MAX; i++) {
 		unsigned int mask = rp->domain_map & (1 << i);
 
-		rd->regs[RAPL_DOMAIN_REG_LIMIT] =
-		    rp->priv->regs[i][RAPL_DOMAIN_REG_LIMIT];
-		rd->regs[RAPL_DOMAIN_REG_STATUS] =
-		    rp->priv->regs[i][RAPL_DOMAIN_REG_STATUS];
-		rd->regs[RAPL_DOMAIN_REG_PERF] =
-		    rp->priv->regs[i][RAPL_DOMAIN_REG_PERF];
-		rd->regs[RAPL_DOMAIN_REG_POLICY] =
-		    rp->priv->regs[i][RAPL_DOMAIN_REG_POLICY];
-		rd->regs[RAPL_DOMAIN_REG_INFO] =
-		    rp->priv->regs[i][RAPL_DOMAIN_REG_INFO];
-
-		switch (mask) {
-		case BIT(RAPL_DOMAIN_PACKAGE):
-			rd->name = rapl_domain_names[RAPL_DOMAIN_PACKAGE];
-			rd->id = RAPL_DOMAIN_PACKAGE;
-			rd->rpl[0].prim_id = PL1_ENABLE;
-			rd->rpl[0].name = pl1_name;
+		if (!mask)
+			continue;
+
+		rd->rp = rp;
+		rd->name = rapl_domain_names[i];
+		rd->id = i;
+		rd->rpl[0].prim_id = PL1_ENABLE;
+		rd->rpl[0].name = pl1_name;
+		/* some domain may support two power limits */
+		if (rp->priv->limits[i] == 2) {
 			rd->rpl[1].prim_id = PL2_ENABLE;
 			rd->rpl[1].name = pl2_name;
-			break;
-		case BIT(RAPL_DOMAIN_PP0):
-			rd->name = rapl_domain_names[RAPL_DOMAIN_PP0];
-			rd->id = RAPL_DOMAIN_PP0;
-			rd->rpl[0].prim_id = PL1_ENABLE;
-			rd->rpl[0].name = pl1_name;
-			break;
-		case BIT(RAPL_DOMAIN_PP1):
-			rd->name = rapl_domain_names[RAPL_DOMAIN_PP1];
-			rd->id = RAPL_DOMAIN_PP1;
-			rd->rpl[0].prim_id = PL1_ENABLE;
-			rd->rpl[0].name = pl1_name;
-			break;
-		case BIT(RAPL_DOMAIN_DRAM):
-			rd->name = rapl_domain_names[RAPL_DOMAIN_DRAM];
-			rd->id = RAPL_DOMAIN_DRAM;
-			rd->rpl[0].prim_id = PL1_ENABLE;
-			rd->rpl[0].name = pl1_name;
+		}
+
+		for (j = 0; j < RAPL_DOMAIN_REG_MAX; j++)
+			rd->regs[j] = rp->priv->regs[i][j];
+
+		if (i == RAPL_DOMAIN_DRAM) {
 			rd->domain_energy_unit =
 			    rapl_defaults->dram_domain_energy_unit;
 			if (rd->domain_energy_unit)
 				pr_info("DRAM domain energy unit %dpj\n",
 					rd->domain_energy_unit);
-			break;
-		}
-		if (mask) {
-			rd->rp = rp;
-			rd++;
 		}
+		rd++;
 	}
 }
 
@@ -613,7 +591,7 @@ static struct rapl_primitive_info rpi[] = {
 			    RAPL_DOMAIN_REG_LIMIT, POWER_UNIT, 0),
 	PRIMITIVE_INFO_INIT(POWER_LIMIT2, POWER_LIMIT2_MASK, 32,
 			    RAPL_DOMAIN_REG_LIMIT, POWER_UNIT, 0),
-	PRIMITIVE_INFO_INIT(FW_LOCK, POWER_PP_LOCK, 31,
+	PRIMITIVE_INFO_INIT(FW_LOCK, POWER_LOW_LOCK, 31,
 			    RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
 	PRIMITIVE_INFO_INIT(PL1_ENABLE, POWER_LIMIT1_ENABLE, 15,
 			    RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0),
@@ -675,9 +653,9 @@ static int rapl_read_data_raw(struct rapl_domain *rd,
 
 	cpu = rd->rp->lead_cpu;
 
-	/* special-case package domain, which uses a different bit */
-	if (prim == FW_LOCK && rd->id == RAPL_DOMAIN_PACKAGE) {
-		rp->mask = POWER_PACKAGE_LOCK;
+	/* domain with 2 limits has different bit */
+	if (prim == FW_LOCK && rd->rp->priv->limits[rd->id] == 2) {
+		rp->mask = POWER_HIGH_LOCK;
 		rp->shift = 63;
 	}
 	/* non-hardware data are collected by the polling thread */
diff --git a/include/linux/intel_rapl.h b/include/linux/intel_rapl.h
index 1ca0f69..2f470d2 100644
--- a/include/linux/intel_rapl.h
+++ b/include/linux/intel_rapl.h
@@ -101,6 +101,7 @@ struct rapl_priv {
 	enum cpuhp_state pcap_rapl_online;
 	u64 reg_unit;
 	u64 regs[RAPL_DOMAIN_MAX][RAPL_DOMAIN_REG_MAX];
+	int limits[RAPL_DOMAIN_MAX];
 	int (*read_raw)(int cpu, struct reg_action *ra);
 	int (*write_raw)(int cpu, struct reg_action *ra);
 };
-- 
2.7.4

[PATCH 12/13] int340X/processor_thermal_device: add support for MMIO RAPL

[Zhang Rui]

Introduce MMIO RAPL support as Intel processor_thermal device exposes the
capability to do RAPL control via MMIO registers.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
 drivers/thermal/intel/int340x_thermal/Kconfig      |   5 +
 .../int340x_thermal/processor_thermal_device.c     | 174 ++++++++++++++++++++-
 2 files changed, 173 insertions(+), 6 deletions(-)

diff --git a/drivers/thermal/intel/int340x_thermal/Kconfig b/drivers/thermal/intel/int340x_thermal/Kconfig
index 5333e01..547a35f 100644
--- a/drivers/thermal/intel/int340x_thermal/Kconfig
+++ b/drivers/thermal/intel/int340x_thermal/Kconfig
@@ -40,4 +40,9 @@ config INT3406_THERMAL
 	  brightness in order to address a thermal condition or to reduce
 	  power consumed by display device.
 
+config PROC_THERMAL_MMIO_RAPL
+	bool
+	depends on 64BIT
+	select INTEL_RAPL_CORE
+	default y
 endif
diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
index 53c84fa..5410c07 100644
--- a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
+++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
@@ -11,6 +11,8 @@
 #include <linux/platform_device.h>
 #include <linux/acpi.h>
 #include <linux/thermal.h>
+#include <linux/cpuhotplug.h>
+#include <linux/intel_rapl.h>
 #include "int340x_thermal_zone.h"
 #include "../intel_soc_dts_iosf.h"
 
@@ -37,6 +39,8 @@
 /* GeminiLake thermal reporting device */
 #define PCI_DEVICE_ID_PROC_GLK_THERMAL	0x318C
 
+#define DRV_NAME "proc_thermal"
+
 struct power_config {
 	u32	index;
 	u32	min_uw;
@@ -52,6 +56,7 @@ struct proc_thermal_device {
 	struct power_config power_limits[2];
 	struct int34x_thermal_zone *int340x_zone;
 	struct intel_soc_dts_sensors *soc_dts;
+	void __iomem *mmio_base;
 };
 
 enum proc_thermal_emum_mode_type {
@@ -60,6 +65,12 @@ enum proc_thermal_emum_mode_type {
 	PROC_THERMAL_PLATFORM_DEV
 };
 
+struct rapl_mmio_regs {
+	u64 reg_unit;
+	u64 regs[RAPL_DOMAIN_MAX][RAPL_DOMAIN_REG_MAX];
+	int limits[RAPL_DOMAIN_MAX];
+};
+
 /*
  * We can have only one type of enumeration, PCI or Platform,
  * not both. So we don't need instance specific data.
@@ -367,8 +378,152 @@ static irqreturn_t proc_thermal_pci_msi_irq(int irq, void *devid)
 	return IRQ_HANDLED;
 }
 
+#ifdef CONFIG_PROC_THERMAL_MMIO_RAPL
+
+#define MCHBAR 0
+
+/* RAPL Support via MMIO interface */
+static struct rapl_priv rapl_mmio_priv;
+
+static int rapl_mmio_cpu_online(unsigned int cpu)
+{
+	struct rapl_package *rp;
+
+	/* mmio rapl supports package 0 only for now */
+	if (topology_physical_package_id(cpu))
+		return 0;
+
+	rp = rapl_find_package_domain(cpu, &rapl_mmio_priv);
+	if (!rp) {
+		rp = rapl_add_package(cpu, &rapl_mmio_priv);
+		if (IS_ERR(rp))
+			return PTR_ERR(rp);
+	}
+	cpumask_set_cpu(cpu, &rp->cpumask);
+	return 0;
+}
+
+static int rapl_mmio_cpu_down_prep(unsigned int cpu)
+{
+	struct rapl_package *rp;
+	int lead_cpu;
+
+	rp = rapl_find_package_domain(cpu, &rapl_mmio_priv);
+	if (!rp)
+		return 0;
+
+	cpumask_clear_cpu(cpu, &rp->cpumask);
+	lead_cpu = cpumask_first(&rp->cpumask);
+	if (lead_cpu >= nr_cpu_ids)
+		rapl_remove_package(rp);
+	else if (rp->lead_cpu == cpu)
+		rp->lead_cpu = lead_cpu;
+	return 0;
+}
+
+static int rapl_mmio_read_raw(int cpu, struct reg_action *ra)
+{
+	if (!ra->reg)
+		return -EINVAL;
+
+	ra->value = readq((void *)ra->reg);
+	ra->value &= ra->mask;
+	return 0;
+}
+
+static int rapl_mmio_write_raw(int cpu, struct reg_action *ra)
+{
+	u64 val;
+
+	if (!ra->reg)
+		return -EINVAL;
+
+	val = readq((void *)ra->reg);
+	val &= ~ra->mask;
+	val |= ra->value;
+	writeq(val, (void *)ra->reg);
+	return 0;
+}
+
+static int proc_thermal_rapl_add(struct pci_dev *pdev,
+				 struct proc_thermal_device *proc_priv,
+				 struct rapl_mmio_regs *rapl_regs)
+{
+	enum rapl_domain_reg_id reg;
+	enum rapl_domain_type domain;
+	u64 resource_start, resource_len;
+	int ret;
+
+	if (!rapl_regs)
+		return 0;
+
+	ret = pcim_iomap_regions(pdev, 1 << MCHBAR, DRV_NAME);
+	if (ret) {
+		dev_err(&pdev->dev, "cannot reserve PCI memory region\n");
+		return -ENOMEM;
+	}
+
+	proc_priv->mmio_base = pcim_iomap_table(pdev)[MCHBAR];
+
+	for (domain = RAPL_DOMAIN_PACKAGE; domain < RAPL_DOMAIN_MAX; domain++) {
+		for (reg = RAPL_DOMAIN_REG_LIMIT; reg < RAPL_DOMAIN_REG_MAX; reg++)
+			if (rapl_regs->regs[domain][reg])
+				rapl_mmio_priv.regs[domain][reg] =
+						(u64)proc_priv->mmio_base +
+						rapl_regs->regs[domain][reg];
+		rapl_mmio_priv.limits[domain] = rapl_regs->limits[domain];
+	}
+	rapl_mmio_priv.reg_unit = (u64)proc_priv->mmio_base + rapl_regs->reg_unit;
+
+	rapl_mmio_priv.read_raw = rapl_mmio_read_raw;
+	rapl_mmio_priv.write_raw = rapl_mmio_write_raw;
+
+	rapl_mmio_priv.control_type = powercap_register_control_type(NULL, "intel-rapl-mmio", NULL);
+	if (IS_ERR(rapl_mmio_priv.control_type)) {
+		pr_debug("failed to register powercap control_type.\n");
+		return PTR_ERR(rapl_mmio_priv.control_type);
+	}
+
+	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powercap/rapl:online",
+				rapl_mmio_cpu_online, rapl_mmio_cpu_down_prep);
+	if (ret < 0) {
+		powercap_unregister_control_type(rapl_mmio_priv.control_type);
+		return ret;
+	}
+	rapl_mmio_priv.pcap_rapl_online = ret;
+
+	return 0;
+}
+
+static void proc_thermal_rapl_remove(void)
+{
+	cpuhp_remove_state(rapl_mmio_priv.pcap_rapl_online);
+	powercap_unregister_control_type(rapl_mmio_priv.control_type);
+}
+
+static const struct rapl_mmio_regs rapl_mmio_hsw = {
+	.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,
+};
+
+#else
+
+static int proc_thermal_rapl_add(struct pci_dev *pdev,
+				 struct proc_thermal_device *proc_priv,
+				 struct rapl_mmio_regs *rapl_regs)
+{
+	return 0;
+}
+static void proc_thermal_rapl_remove(void) {}
+static const struct rapl_mmio_regs rapl_mmio_hsw;
+
+#endif /* CONFIG_MMIO_RAPL */
+
 static int  proc_thermal_pci_probe(struct pci_dev *pdev,
-				   const struct pci_device_id *unused)
+				   const struct pci_device_id *id)
 {
 	struct proc_thermal_device *proc_priv;
 	int ret;
@@ -378,15 +533,21 @@ static int  proc_thermal_pci_probe(struct pci_dev *pdev,
 		return -ENODEV;
 	}
 
-	ret = pci_enable_device(pdev);
+	ret = pcim_enable_device(pdev);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "error: could not enable device\n");
 		return ret;
 	}
 
 	ret = proc_thermal_add(&pdev->dev, &proc_priv);
+	if (ret)
+		return ret;
+
+	ret = proc_thermal_rapl_add(pdev, proc_priv,
+				(struct rapl_mmio_regs *)id->driver_data);
 	if (ret) {
-		pci_disable_device(pdev);
+		dev_err(&pdev->dev, "failed to add RAPL MMIO interface\n");
+		proc_thermal_remove(proc_priv);
 		return ret;
 	}
 
@@ -439,14 +600,15 @@ static void  proc_thermal_pci_remove(struct pci_dev *pdev)
 			pci_disable_msi(pdev);
 		}
 	}
+	proc_thermal_rapl_remove();
 	proc_thermal_remove(proc_priv);
-	pci_disable_device(pdev);
 }
 
 static const struct pci_device_id proc_thermal_pci_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BDW_THERMAL)},
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_HSB_THERMAL)},
-	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_SKL_THERMAL)},
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_SKL_THERMAL),
+		.driver_data = (kernel_ulong_t)&rapl_mmio_hsw, },
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BSW_THERMAL)},
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXT0_THERMAL)},
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXT1_THERMAL)},
@@ -461,7 +623,7 @@ static const struct pci_device_id proc_thermal_pci_ids[] = {
 MODULE_DEVICE_TABLE(pci, proc_thermal_pci_ids);
 
 static struct pci_driver proc_thermal_pci_driver = {
-	.name		= "proc_thermal",
+	.name		= DRV_NAME,
 	.probe		= proc_thermal_pci_probe,
 	.remove		= proc_thermal_pci_remove,
 	.id_table	= proc_thermal_pci_ids,
-- 
2.7.4

[PATCH 13/13] intel_rapl: Fix module autoloading issue

[Zhang Rui]

intel_rapl driver used to have a list of cpuids, which is used to
1. check if the processor support RAPL MSRs
2. do some cpu model specific setting
3. module autoloading

Now, the cpu model specific setting are moved to intel_rapl_common.c as
part of the common code, because the setup is also needed by RAPL MMIO
interface on those platforms.
But removing the cpuid list from intel_rapl MSR interface driver results
in that the driver can not be loaded automatically.

Maintaining another copy of the cpuid list in intel_rapl.c does not make
sense because it increases the complexity when enabling RAPL support on a
new cpu model.

Fix the problem by creating an "intel_rapl_msr" platform device in the
common code, and make RAPL MSR interface driver (intel_rapl.c) probe the
platform device directly.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
 drivers/powercap/intel_rapl.c        | 24 +++++++++++++++----
 drivers/powercap/intel_rapl_common.c | 45 ++++++++++++++++++++++--------------
 2 files changed, 48 insertions(+), 21 deletions(-)

diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index ce0948a..1dd8008 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -19,6 +19,7 @@
 #include <linux/powercap.h>
 #include <linux/suspend.h>
 #include <linux/intel_rapl.h>
+#include <linux/platform_device.h>
 
 #include <asm/iosf_mbi.h>
 #include <asm/processor.h>
@@ -122,7 +123,7 @@ static int rapl_msr_write_raw(int cpu, struct reg_action *ra)
 	return ret;
 }
 
-static int __init rapl_msr_init(void)
+static int rapl_msr_probe(struct platform_device *pdev)
 {
 	int ret;
 
@@ -152,15 +153,30 @@ static int __init rapl_msr_init(void)
 	return ret;
 }
 
-static void __exit rapl_msr_exit(void)
+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;
 }
 
-module_init(rapl_msr_init);
-module_exit(rapl_msr_exit);
+static const struct platform_device_id rapl_msr_ids[] = {
+	{ .name = "intel_rapl_msr", },
+	{}
+};
+MODULE_DEVICE_TABLE(platform, rapl_msr_ids);
+
+static struct platform_driver intel_rapl_msr_driver = {
+	.probe = rapl_msr_probe,
+	.remove = rapl_msr_remove,
+	.id_table = rapl_msr_ids,
+	.driver = {
+		.name = "intel_rapl_msr",
+	},
+};
+
+module_platform_driver(intel_rapl_msr_driver);
 
 MODULE_DESCRIPTION("Driver for Intel RAPL (Running Average Power Limit)");
 MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@intel.com>");
diff --git a/drivers/powercap/intel_rapl_common.c b/drivers/powercap/intel_rapl_common.c
index ef6a9d0..9f94997 100644
--- a/drivers/powercap/intel_rapl_common.c
+++ b/drivers/powercap/intel_rapl_common.c
@@ -18,10 +18,11 @@
 #include <linux/cpu.h>
 #include <linux/powercap.h>
 #include <linux/suspend.h>
-#include <asm/iosf_mbi.h>
 #include <linux/intel_rapl.h>
-
 #include <linux/processor.h>
+#include <linux/platform_device.h>
+
+#include <asm/iosf_mbi.h>
 #include <asm/cpu_device_id.h>
 #include <asm/intel-family.h>
 
@@ -136,8 +137,6 @@ static int rapl_write_data_raw(struct rapl_domain *rd,
 static u64 rapl_unit_xlate(struct rapl_domain *rd,
 			   enum unit_type type, u64 value, int to_raw);
 static void package_power_limit_irq_save(struct rapl_package *rp);
-static int rapl_init_core(void);
-static void rapl_remove_core(void);
 
 static LIST_HEAD(rapl_packages);	/* guarded by CPU hotplug lock */
 
@@ -1262,8 +1261,6 @@ void rapl_remove_package(struct rapl_package *rp)
 	powercap_unregister_zone(rp->priv->control_type,
 				 &rd_package->power_zone);
 	list_del(&rp->plist);
-	if (list_empty(&rapl_packages))
-		rapl_remove_core();
 	kfree(rp);
 }
 EXPORT_SYMBOL_GPL(rapl_remove_package);
@@ -1292,10 +1289,6 @@ struct rapl_package *rapl_add_package(int cpu, struct rapl_priv *priv)
 	struct cpuinfo_x86 *c = &cpu_data(cpu);
 	int ret;
 
-	ret = rapl_init_core();
-	if (ret)
-		return ERR_PTR(ret);
-
 	rp = kzalloc(sizeof(struct rapl_package), GFP_KERNEL);
 	if (!rp)
 		return ERR_PTR(-ENOMEM);
@@ -1413,14 +1406,13 @@ static struct notifier_block rapl_pm_notifier = {
 	.notifier_call = rapl_pm_callback,
 };
 
-static int rapl_init_core(void)
+static struct platform_device *rapl_msr_platdev;
+
+static int __init rapl_init(void)
 {
 	const struct x86_cpu_id *id;
 	int ret;
 
-	if (rapl_defaults)
-		return 0;
-
 	id = x86_match_cpu(rapl_ids);
 	if (!id) {
 		pr_err("driver does not support CPU family %d model %d\n",
@@ -1432,15 +1424,34 @@ static int rapl_init_core(void)
 	rapl_defaults = (struct rapl_defaults *)id->driver_data;
 
 	ret = register_pm_notifier(&rapl_pm_notifier);
+	if (ret)
+		return ret;
 
-	return 0;
+	rapl_msr_platdev = platform_device_alloc("intel_rapl_msr", 0);
+	if (!rapl_msr_platdev) {
+		ret = -ENOMEM;
+		goto end;
+	}
+
+	ret = platform_device_add(rapl_msr_platdev);
+	if (ret)
+		platform_device_put(rapl_msr_platdev);
+
+end:
+	if (ret)
+		unregister_pm_notifier(&rapl_pm_notifier);
+
+	return ret;
 }
 
-static void rapl_remove_core(void)
+static void __exit rapl_exit(void)
 {
+	platform_device_unregister(rapl_msr_platdev);
 	unregister_pm_notifier(&rapl_pm_notifier);
-	rapl_defaults = NULL;
 }
 
+module_init(rapl_init);
+module_exit(rapl_exit);
+
 MODULE_DESCRIPTION("Runtime Average Power Limit (RAPL) core");
 MODULE_LICENSE("GPL v2");
-- 
2.7.4

Re: [PATCH 12/13] int340X/processor_thermal_device: add support for MMIO RAPL

[Zhang Rui]

On 二, 2019-06-25 at 23:16 +0800, Zhang Rui wrote:
> Introduce MMIO RAPL support as Intel processor_thermal device exposes
> the
> capability to do RAPL control via MMIO registers.
> 
> Signed-off-by: Zhang Rui <rui.zhang@intel.com>

hmmm, just saw a build warning of this patch, I will check and resend.

thanks,
rui
> ---
>  drivers/thermal/intel/int340x_thermal/Kconfig      |   5 +
>  .../int340x_thermal/processor_thermal_device.c     | 174
> ++++++++++++++++++++-
>  2 files changed, 173 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/thermal/intel/int340x_thermal/Kconfig
> b/drivers/thermal/intel/int340x_thermal/Kconfig
> index 5333e01..547a35f 100644
> --- a/drivers/thermal/intel/int340x_thermal/Kconfig
> +++ b/drivers/thermal/intel/int340x_thermal/Kconfig
> @@ -40,4 +40,9 @@ config INT3406_THERMAL
>  	  brightness in order to address a thermal condition or to
> reduce
>  	  power consumed by display device.
>  
> +config PROC_THERMAL_MMIO_RAPL
> +	bool
> +	depends on 64BIT
> +	select INTEL_RAPL_CORE
> +	default y
>  endif
> diff --git
> a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> index 53c84fa..5410c07 100644
> ---
> a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> +++
> b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> @@ -11,6 +11,8 @@
>  #include <linux/platform_device.h>
>  #include <linux/acpi.h>
>  #include <linux/thermal.h>
> +#include <linux/cpuhotplug.h>
> +#include <linux/intel_rapl.h>
>  #include "int340x_thermal_zone.h"
>  #include "../intel_soc_dts_iosf.h"
>  
> @@ -37,6 +39,8 @@
>  /* GeminiLake thermal reporting device */
>  #define PCI_DEVICE_ID_PROC_GLK_THERMAL	0x318C
>  
> +#define DRV_NAME "proc_thermal"
> +
>  struct power_config {
>  	u32	index;
>  	u32	min_uw;
> @@ -52,6 +56,7 @@ struct proc_thermal_device {
>  	struct power_config power_limits[2];
>  	struct int34x_thermal_zone *int340x_zone;
>  	struct intel_soc_dts_sensors *soc_dts;
> +	void __iomem *mmio_base;
>  };
>  
>  enum proc_thermal_emum_mode_type {
> @@ -60,6 +65,12 @@ enum proc_thermal_emum_mode_type {
>  	PROC_THERMAL_PLATFORM_DEV
>  };
>  
> +struct rapl_mmio_regs {
> +	u64 reg_unit;
> +	u64 regs[RAPL_DOMAIN_MAX][RAPL_DOMAIN_REG_MAX];
> +	int limits[RAPL_DOMAIN_MAX];
> +};
> +
>  /*
>   * We can have only one type of enumeration, PCI or Platform,
>   * not both. So we don't need instance specific data.
> @@ -367,8 +378,152 @@ static irqreturn_t proc_thermal_pci_msi_irq(int
> irq, void *devid)
>  	return IRQ_HANDLED;
>  }
>  
> +#ifdef CONFIG_PROC_THERMAL_MMIO_RAPL
> +
> +#define MCHBAR 0
> +
> +/* RAPL Support via MMIO interface */
> +static struct rapl_priv rapl_mmio_priv;
> +
> +static int rapl_mmio_cpu_online(unsigned int cpu)
> +{
> +	struct rapl_package *rp;
> +
> +	/* mmio rapl supports package 0 only for now */
> +	if (topology_physical_package_id(cpu))
> +		return 0;
> +
> +	rp = rapl_find_package_domain(cpu, &rapl_mmio_priv);
> +	if (!rp) {
> +		rp = rapl_add_package(cpu, &rapl_mmio_priv);
> +		if (IS_ERR(rp))
> +			return PTR_ERR(rp);
> +	}
> +	cpumask_set_cpu(cpu, &rp->cpumask);
> +	return 0;
> +}
> +
> +static int rapl_mmio_cpu_down_prep(unsigned int cpu)
> +{
> +	struct rapl_package *rp;
> +	int lead_cpu;
> +
> +	rp = rapl_find_package_domain(cpu, &rapl_mmio_priv);
> +	if (!rp)
> +		return 0;
> +
> +	cpumask_clear_cpu(cpu, &rp->cpumask);
> +	lead_cpu = cpumask_first(&rp->cpumask);
> +	if (lead_cpu >= nr_cpu_ids)
> +		rapl_remove_package(rp);
> +	else if (rp->lead_cpu == cpu)
> +		rp->lead_cpu = lead_cpu;
> +	return 0;
> +}
> +
> +static int rapl_mmio_read_raw(int cpu, struct reg_action *ra)
> +{
> +	if (!ra->reg)
> +		return -EINVAL;
> +
> +	ra->value = readq((void *)ra->reg);
> +	ra->value &= ra->mask;
> +	return 0;
> +}
> +
> +static int rapl_mmio_write_raw(int cpu, struct reg_action *ra)
> +{
> +	u64 val;
> +
> +	if (!ra->reg)
> +		return -EINVAL;
> +
> +	val = readq((void *)ra->reg);
> +	val &= ~ra->mask;
> +	val |= ra->value;
> +	writeq(val, (void *)ra->reg);
> +	return 0;
> +}
> +
> +static int proc_thermal_rapl_add(struct pci_dev *pdev,
> +				 struct proc_thermal_device
> *proc_priv,
> +				 struct rapl_mmio_regs *rapl_regs)
> +{
> +	enum rapl_domain_reg_id reg;
> +	enum rapl_domain_type domain;
> +	u64 resource_start, resource_len;
> +	int ret;
> +
> +	if (!rapl_regs)
> +		return 0;
> +
> +	ret = pcim_iomap_regions(pdev, 1 << MCHBAR, DRV_NAME);
> +	if (ret) {
> +		dev_err(&pdev->dev, "cannot reserve PCI memory
> region\n");
> +		return -ENOMEM;
> +	}
> +
> +	proc_priv->mmio_base = pcim_iomap_table(pdev)[MCHBAR];
> +
> +	for (domain = RAPL_DOMAIN_PACKAGE; domain < RAPL_DOMAIN_MAX;
> domain++) {
> +		for (reg = RAPL_DOMAIN_REG_LIMIT; reg <
> RAPL_DOMAIN_REG_MAX; reg++)
> +			if (rapl_regs->regs[domain][reg])
> +				rapl_mmio_priv.regs[domain][reg] =
> +						(u64)proc_priv-
> >mmio_base +
> +						rapl_regs-
> >regs[domain][reg];
> +		rapl_mmio_priv.limits[domain] = rapl_regs-
> >limits[domain];
> +	}
> +	rapl_mmio_priv.reg_unit = (u64)proc_priv->mmio_base +
> rapl_regs->reg_unit;
> +
> +	rapl_mmio_priv.read_raw = rapl_mmio_read_raw;
> +	rapl_mmio_priv.write_raw = rapl_mmio_write_raw;
> +
> +	rapl_mmio_priv.control_type =
> powercap_register_control_type(NULL, "intel-rapl-mmio", NULL);
> +	if (IS_ERR(rapl_mmio_priv.control_type)) {
> +		pr_debug("failed to register powercap
> control_type.\n");
> +		return PTR_ERR(rapl_mmio_priv.control_type);
> +	}
> +
> +	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
> "powercap/rapl:online",
> +				rapl_mmio_cpu_online,
> rapl_mmio_cpu_down_prep);
> +	if (ret < 0) {
> +		powercap_unregister_control_type(rapl_mmio_priv.cont
> rol_type);
> +		return ret;
> +	}
> +	rapl_mmio_priv.pcap_rapl_online = ret;
> +
> +	return 0;
> +}
> +
> +static void proc_thermal_rapl_remove(void)
> +{
> +	cpuhp_remove_state(rapl_mmio_priv.pcap_rapl_online);
> +	powercap_unregister_control_type(rapl_mmio_priv.control_type
> );
> +}
> +
> +static const struct rapl_mmio_regs rapl_mmio_hsw = {
> +	.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,
> +};
> +
> +#else
> +
> +static int proc_thermal_rapl_add(struct pci_dev *pdev,
> +				 struct proc_thermal_device
> *proc_priv,
> +				 struct rapl_mmio_regs *rapl_regs)
> +{
> +	return 0;
> +}
> +static void proc_thermal_rapl_remove(void) {}
> +static const struct rapl_mmio_regs rapl_mmio_hsw;
> +
> +#endif /* CONFIG_MMIO_RAPL */
> +
>  static int  proc_thermal_pci_probe(struct pci_dev *pdev,
> -				   const struct pci_device_id
> *unused)
> +				   const struct pci_device_id *id)
>  {
>  	struct proc_thermal_device *proc_priv;
>  	int ret;
> @@ -378,15 +533,21 @@ static int  proc_thermal_pci_probe(struct
> pci_dev *pdev,
>  		return -ENODEV;
>  	}
>  
> -	ret = pci_enable_device(pdev);
> +	ret = pcim_enable_device(pdev);
>  	if (ret < 0) {
>  		dev_err(&pdev->dev, "error: could not enable
> device\n");
>  		return ret;
>  	}
>  
>  	ret = proc_thermal_add(&pdev->dev, &proc_priv);
> +	if (ret)
> +		return ret;
> +
> +	ret = proc_thermal_rapl_add(pdev, proc_priv,
> +				(struct rapl_mmio_regs *)id-
> >driver_data);
>  	if (ret) {
> -		pci_disable_device(pdev);
> +		dev_err(&pdev->dev, "failed to add RAPL MMIO
> interface\n");
> +		proc_thermal_remove(proc_priv);
>  		return ret;
>  	}
>  
> @@ -439,14 +600,15 @@ static void  proc_thermal_pci_remove(struct
> pci_dev *pdev)
>  			pci_disable_msi(pdev);
>  		}
>  	}
> +	proc_thermal_rapl_remove();
>  	proc_thermal_remove(proc_priv);
> -	pci_disable_device(pdev);
>  }
>  
>  static const struct pci_device_id proc_thermal_pci_ids[] = {
>  	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL,
> PCI_DEVICE_ID_PROC_BDW_THERMAL)},
>  	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL,
> PCI_DEVICE_ID_PROC_HSB_THERMAL)},
> -	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL,
> PCI_DEVICE_ID_PROC_SKL_THERMAL)},
> +	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL,
> PCI_DEVICE_ID_PROC_SKL_THERMAL),
> +		.driver_data = (kernel_ulong_t)&rapl_mmio_hsw, },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL,
> PCI_DEVICE_ID_PROC_BSW_THERMAL)},
>  	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL,
> PCI_DEVICE_ID_PROC_BXT0_THERMAL)},
>  	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL,
> PCI_DEVICE_ID_PROC_BXT1_THERMAL)},
> @@ -461,7 +623,7 @@ static const struct pci_device_id
> proc_thermal_pci_ids[] = {
>  MODULE_DEVICE_TABLE(pci, proc_thermal_pci_ids);
>  
>  static struct pci_driver proc_thermal_pci_driver = {
> -	.name		= "proc_thermal",
> +	.name		= DRV_NAME,
>  	.probe		= proc_thermal_pci_probe,
>  	.remove		= proc_thermal_pci_remove,
>  	.id_table	= proc_thermal_pci_ids,

Re: [PATCH 04/13] intel_rapl: introduce struct rapl_private

[Zhang Rui]

On 二, 2019-07-02 at 23:44 +0200, Rafael J. Wysocki wrote:
> On Fri, Jun 28, 2019 at 7:50 AM Zhang Rui <rui.zhang@intel.com>
> wrote:
> > 
> > 
> > Introduce a new structure, rapl_private, to save the private data
> > for different RAPL Interface.
> The new structure is called rapl_priv in the patch.
> 
> Besides, I would call it rapl_if_priv to indicate that this related
> to
> an interface.
> 
> Also, IMO there should be a kerneldoc comment for it.
> 
okay.
> > 
> > Signed-off-by: Zhang Rui <rui.zhang@intel.com>
> > ---
> >  drivers/powercap/intel_rapl.c | 58 +++++++++++++++++++++--------
> > --------------
> >  include/linux/intel_rapl.h    |  7 ++++++
> >  2 files changed, 35 insertions(+), 30 deletions(-)
> > 
> > diff --git a/drivers/powercap/intel_rapl.c
> > b/drivers/powercap/intel_rapl.c
> > index adb35ec..a804370 100644
> > --- a/drivers/powercap/intel_rapl.c
> > +++ b/drivers/powercap/intel_rapl.c
> > @@ -75,6 +75,8 @@ enum unit_type {
> >         TIME_UNIT,
> >  };
> > 
> > +static struct rapl_priv rapl_msr_priv;
> Please add a comment describing this variable and its role.
> 
> BTW, I'd rather call it rapl_if_msr.
> 
> > 
> > +
> >  /* per domain data, some are optional */
> >  #define NR_RAW_PRIMITIVES (NR_RAPL_PRIMITIVES - 2)
> > 
> > @@ -155,17 +157,14 @@ static const char * const rapl_domain_names[]
> > = {
> >         "psys",
> >  };
> > 
> > -static struct powercap_control_type *control_type; /* PowerCap
> > Controller */
> > -static struct rapl_domain *platform_rapl_domain; /* Platform
> > (PSys) domain */
> Why do these things need to go into rapl_priv?
> 
different RAPL interface may have its own control_type,
"intel_rapl_msr" vs. "intel_rapl_mmio".

MMIO RAPL interface does not have platform rapl domain so far, but
given that the current platform rapl domain uses
MSR_PLATFORM_POWER_LIMIT and MSR_PLATFORM_ENERGY_STATUS.
I made it part of MSR RAPL interface driver.

thanks,
rui

Re: [PATCH 04/13] intel_rapl: introduce struct rapl_private

[Rafael J. Wysocki]

On Fri, Jun 28, 2019 at 7:50 AM Zhang Rui <rui.zhang@intel.com> wrote:
>
> Introduce a new structure, rapl_private, to save the private data
> for different RAPL Interface.

The new structure is called rapl_priv in the patch.

Besides, I would call it rapl_if_priv to indicate that this related to
an interface.

Also, IMO there should be a kerneldoc comment for it.

> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
> ---
>  drivers/powercap/intel_rapl.c | 58 +++++++++++++++++++++----------------------
>  include/linux/intel_rapl.h    |  7 ++++++
>  2 files changed, 35 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
> index adb35ec..a804370 100644
> --- a/drivers/powercap/intel_rapl.c
> +++ b/drivers/powercap/intel_rapl.c
> @@ -75,6 +75,8 @@ enum unit_type {
>         TIME_UNIT,
>  };
>
> +static struct rapl_priv rapl_msr_priv;

Please add a comment describing this variable and its role.

BTW, I'd rather call it rapl_if_msr.

> +
>  /* per domain data, some are optional */
>  #define NR_RAW_PRIMITIVES (NR_RAPL_PRIMITIVES - 2)
>
> @@ -155,17 +157,14 @@ static const char * const rapl_domain_names[] = {
>         "psys",
>  };
>
> -static struct powercap_control_type *control_type; /* PowerCap Controller */
> -static struct rapl_domain *platform_rapl_domain; /* Platform (PSys) domain */

Why do these things need to go into rapl_priv?

> -
>  /* caller to ensure CPU hotplug lock is held */
> -static struct rapl_package *rapl_find_package_domain(int cpu)
> +static struct rapl_package *rapl_find_package_domain(int cpu, struct rapl_priv *priv)
>  {
>         int id = topology_logical_die_id(cpu);
>         struct rapl_package *rp;
>
>         list_for_each_entry(rp, &rapl_packages, plist) {
> -               if (rp->id == id)
> +               if (rp->id == id && rp->priv->control_type == priv->control_type)
>                         return rp;
>         }
>
> @@ -1090,12 +1089,12 @@ static void rapl_update_domain_data(struct rapl_package *rp)
>
>  static void rapl_unregister_powercap(void)
>  {
> -       if (platform_rapl_domain) {
> -               powercap_unregister_zone(control_type,
> -                                        &platform_rapl_domain->power_zone);
> -               kfree(platform_rapl_domain);
> +       if (&rapl_msr_priv.platform_rapl_domain) {
> +               powercap_unregister_zone(rapl_msr_priv.control_type,
> +                                        &rapl_msr_priv.platform_rapl_domain->power_zone);
> +               kfree(rapl_msr_priv.platform_rapl_domain);
>         }
> -       powercap_unregister_control_type(control_type);
> +       powercap_unregister_control_type(rapl_msr_priv.control_type);
>  }
>
>  static int rapl_package_register_powercap(struct rapl_package *rp)
> @@ -1113,7 +1112,7 @@ static int rapl_package_register_powercap(struct rapl_package *rp)
>                         nr_pl = find_nr_power_limit(rd);
>                         pr_debug("register package domain %s\n", rp->name);
>                         power_zone = powercap_register_zone(&rd->power_zone,
> -                                                       control_type,
> +                                                       rp->priv->control_type,
>                                                         rp->name, NULL,
>                                                         &zone_ops[rd->id],
>                                                         nr_pl,
> @@ -1140,7 +1139,7 @@ static int rapl_package_register_powercap(struct rapl_package *rp)
>                 /* number of power limits per domain varies */
>                 nr_pl = find_nr_power_limit(rd);
>                 power_zone = powercap_register_zone(&rd->power_zone,
> -                                               control_type, rd->name,
> +                                               rp->priv->control_type, rd->name,
>                                                 rp->power_zone,
>                                                 &zone_ops[rd->id], nr_pl,
>                                                 &constraint_ops);
> @@ -1161,7 +1160,7 @@ static int rapl_package_register_powercap(struct rapl_package *rp)
>          */
>         while (--rd >= rp->domains) {
>                 pr_debug("unregister %s domain %s\n", rp->name, rd->name);
> -               powercap_unregister_zone(control_type, &rd->power_zone);
> +               powercap_unregister_zone(rp->priv->control_type, &rd->power_zone);
>         }
>
>         return ret;
> @@ -1191,9 +1190,9 @@ static int __init rapl_register_psys(void)
>         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);
> +       rd->rp = rapl_find_package_domain(0, &rapl_msr_priv);
>
> -       power_zone = powercap_register_zone(&rd->power_zone, control_type,
> +       power_zone = powercap_register_zone(&rd->power_zone, rapl_msr_priv.control_type,
>                                             "psys", NULL,
>                                             &zone_ops[RAPL_DOMAIN_PLATFORM],
>                                             2, &constraint_ops);
> @@ -1203,17 +1202,17 @@ static int __init rapl_register_psys(void)
>                 return PTR_ERR(power_zone);
>         }
>
> -       platform_rapl_domain = rd;
> +       rapl_msr_priv.platform_rapl_domain = rd;
>
>         return 0;
>  }
>
>  static int __init rapl_register_powercap(void)
>  {
> -       control_type = powercap_register_control_type(NULL, "intel-rapl", NULL);
> -       if (IS_ERR(control_type)) {
> +       rapl_msr_priv.control_type = powercap_register_control_type(NULL, "intel-rapl", NULL);
> +       if (IS_ERR(rapl_msr_priv.control_type)) {
>                 pr_debug("failed to register powercap control_type.\n");
> -               return PTR_ERR(control_type);
> +               return PTR_ERR(rapl_msr_priv.control_type);
>         }
>         return 0;
>  }
> @@ -1338,16 +1337,16 @@ static void rapl_remove_package(struct rapl_package *rp)
>                 }
>                 pr_debug("remove package, undo power limit on %s: %s\n",
>                          rp->name, rd->name);
> -               powercap_unregister_zone(control_type, &rd->power_zone);
> +               powercap_unregister_zone(rp->priv->control_type, &rd->power_zone);
>         }
>         /* do parent zone last */
> -       powercap_unregister_zone(control_type, &rd_package->power_zone);
> +       powercap_unregister_zone(rp->priv->control_type, &rd_package->power_zone);
>         list_del(&rp->plist);
>         kfree(rp);
>  }
>
>  /* called from CPU hotplug notifier, hotplug lock held */
> -static struct rapl_package *rapl_add_package(int cpu)
> +static struct rapl_package *rapl_add_package(int cpu, struct rapl_priv *priv)
>  {
>         int id = topology_logical_die_id(cpu);
>         struct rapl_package *rp;
> @@ -1361,6 +1360,7 @@ static struct rapl_package *rapl_add_package(int cpu)
>         /* add the new package to the list */
>         rp->id = id;
>         rp->lead_cpu = cpu;
> +       rp->priv = priv;
>
>         if (topology_max_die_per_package() > 1)
>                 snprintf(rp->name, PACKAGE_DOMAIN_NAME_LENGTH,
> @@ -1399,9 +1399,9 @@ static int rapl_cpu_online(unsigned int cpu)
>  {
>         struct rapl_package *rp;
>
> -       rp = rapl_find_package_domain(cpu);
> +       rp = rapl_find_package_domain(cpu, &rapl_msr_priv);
>         if (!rp) {
> -               rp = rapl_add_package(cpu);
> +               rp = rapl_add_package(cpu, &rapl_msr_priv);
>                 if (IS_ERR(rp))
>                         return PTR_ERR(rp);
>         }
> @@ -1414,7 +1414,7 @@ static int rapl_cpu_down_prep(unsigned int cpu)
>         struct rapl_package *rp;
>         int lead_cpu;
>
> -       rp = rapl_find_package_domain(cpu);
> +       rp = rapl_find_package_domain(cpu, &rapl_msr_priv);
>         if (!rp)
>                 return 0;
>
> @@ -1427,8 +1427,6 @@ static int rapl_cpu_down_prep(unsigned int cpu)
>         return 0;
>  }
>
> -static enum cpuhp_state pcap_rapl_online;
> -
>  static void power_limit_state_save(void)
>  {
>         struct rapl_package *rp;
> @@ -1538,7 +1536,7 @@ static int __init rapl_init(void)
>                                 rapl_cpu_online, rapl_cpu_down_prep);
>         if (ret < 0)
>                 goto err_unreg;
> -       pcap_rapl_online = ret;
> +       rapl_msr_priv.pcap_rapl_online = ret;
>
>         /* Don't bail out if PSys is not supported */
>         rapl_register_psys();
> @@ -1550,7 +1548,7 @@ static int __init rapl_init(void)
>         return 0;
>
>  err_unreg_all:
> -       cpuhp_remove_state(pcap_rapl_online);
> +       cpuhp_remove_state(rapl_msr_priv.pcap_rapl_online);
>
>  err_unreg:
>         rapl_unregister_powercap();
> @@ -1560,7 +1558,7 @@ static int __init rapl_init(void)
>  static void __exit rapl_exit(void)
>  {
>         unregister_pm_notifier(&rapl_pm_notifier);
> -       cpuhp_remove_state(pcap_rapl_online);
> +       cpuhp_remove_state(rapl_msr_priv.pcap_rapl_online);
>         rapl_unregister_powercap();
>  }
>
> diff --git a/include/linux/intel_rapl.h b/include/linux/intel_rapl.h
> index 9471603..d6a8547 100644
> --- a/include/linux/intel_rapl.h
> +++ b/include/linux/intel_rapl.h
> @@ -88,6 +88,12 @@ struct rapl_domain {
>         struct rapl_package *rp;
>  };
>
> +struct rapl_priv {
> +       struct powercap_control_type *control_type;
> +       struct rapl_domain *platform_rapl_domain;
> +       enum cpuhp_state pcap_rapl_online;
> +};
> +
>  /* maximum rapl package domain name: package-%d-die-%d */
>  #define PACKAGE_DOMAIN_NAME_LENGTH 30
>
> @@ -108,6 +114,7 @@ struct rapl_package {
>         /* Track active cpus */
>         struct cpumask cpumask;
>         char name[PACKAGE_DOMAIN_NAME_LENGTH];
> +       struct rapl_priv *priv;
>  };
>
>  #endif /* __INTEL_RAPL_H__ */
> --
> 2.7.4
>

[PATCH 04/13] intel_rapl: introduce struct rapl_private

[Zhang Rui]

Introduce a new structure, rapl_private, to save the private data
for different RAPL Interface.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
 drivers/powercap/intel_rapl.c | 58 +++++++++++++++++++++----------------------
 include/linux/intel_rapl.h    |  7 ++++++
 2 files changed, 35 insertions(+), 30 deletions(-)

diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index adb35ec..a804370 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -75,6 +75,8 @@ enum unit_type {
 	TIME_UNIT,
 };
 
+static struct rapl_priv rapl_msr_priv;
+
 /* per domain data, some are optional */
 #define NR_RAW_PRIMITIVES (NR_RAPL_PRIMITIVES - 2)
 
@@ -155,17 +157,14 @@ static const char * const rapl_domain_names[] = {
 	"psys",
 };
 
-static struct powercap_control_type *control_type; /* PowerCap Controller */
-static struct rapl_domain *platform_rapl_domain; /* Platform (PSys) domain */
-
 /* caller to ensure CPU hotplug lock is held */
-static struct rapl_package *rapl_find_package_domain(int cpu)
+static struct rapl_package *rapl_find_package_domain(int cpu, struct rapl_priv *priv)
 {
 	int id = topology_logical_die_id(cpu);
 	struct rapl_package *rp;
 
 	list_for_each_entry(rp, &rapl_packages, plist) {
-		if (rp->id == id)
+		if (rp->id == id && rp->priv->control_type == priv->control_type)
 			return rp;
 	}
 
@@ -1090,12 +1089,12 @@ static void rapl_update_domain_data(struct rapl_package *rp)
 
 static void rapl_unregister_powercap(void)
 {
-	if (platform_rapl_domain) {
-		powercap_unregister_zone(control_type,
-					 &platform_rapl_domain->power_zone);
-		kfree(platform_rapl_domain);
+	if (&rapl_msr_priv.platform_rapl_domain) {
+		powercap_unregister_zone(rapl_msr_priv.control_type,
+					 &rapl_msr_priv.platform_rapl_domain->power_zone);
+		kfree(rapl_msr_priv.platform_rapl_domain);
 	}
-	powercap_unregister_control_type(control_type);
+	powercap_unregister_control_type(rapl_msr_priv.control_type);
 }
 
 static int rapl_package_register_powercap(struct rapl_package *rp)
@@ -1113,7 +1112,7 @@ static int rapl_package_register_powercap(struct rapl_package *rp)
 			nr_pl = find_nr_power_limit(rd);
 			pr_debug("register package domain %s\n", rp->name);
 			power_zone = powercap_register_zone(&rd->power_zone,
-							control_type,
+							rp->priv->control_type,
 							rp->name, NULL,
 							&zone_ops[rd->id],
 							nr_pl,
@@ -1140,7 +1139,7 @@ static int rapl_package_register_powercap(struct rapl_package *rp)
 		/* number of power limits per domain varies */
 		nr_pl = find_nr_power_limit(rd);
 		power_zone = powercap_register_zone(&rd->power_zone,
-						control_type, rd->name,
+						rp->priv->control_type, rd->name,
 						rp->power_zone,
 						&zone_ops[rd->id], nr_pl,
 						&constraint_ops);
@@ -1161,7 +1160,7 @@ static int rapl_package_register_powercap(struct rapl_package *rp)
 	 */
 	while (--rd >= rp->domains) {
 		pr_debug("unregister %s domain %s\n", rp->name, rd->name);
-		powercap_unregister_zone(control_type, &rd->power_zone);
+		powercap_unregister_zone(rp->priv->control_type, &rd->power_zone);
 	}
 
 	return ret;
@@ -1191,9 +1190,9 @@ static int __init rapl_register_psys(void)
 	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);
+	rd->rp = rapl_find_package_domain(0, &rapl_msr_priv);
 
-	power_zone = powercap_register_zone(&rd->power_zone, control_type,
+	power_zone = powercap_register_zone(&rd->power_zone, rapl_msr_priv.control_type,
 					    "psys", NULL,
 					    &zone_ops[RAPL_DOMAIN_PLATFORM],
 					    2, &constraint_ops);
@@ -1203,17 +1202,17 @@ static int __init rapl_register_psys(void)
 		return PTR_ERR(power_zone);
 	}
 
-	platform_rapl_domain = rd;
+	rapl_msr_priv.platform_rapl_domain = rd;
 
 	return 0;
 }
 
 static int __init rapl_register_powercap(void)
 {
-	control_type = powercap_register_control_type(NULL, "intel-rapl", NULL);
-	if (IS_ERR(control_type)) {
+	rapl_msr_priv.control_type = powercap_register_control_type(NULL, "intel-rapl", NULL);
+	if (IS_ERR(rapl_msr_priv.control_type)) {
 		pr_debug("failed to register powercap control_type.\n");
-		return PTR_ERR(control_type);
+		return PTR_ERR(rapl_msr_priv.control_type);
 	}
 	return 0;
 }
@@ -1338,16 +1337,16 @@ static void rapl_remove_package(struct rapl_package *rp)
 		}
 		pr_debug("remove package, undo power limit on %s: %s\n",
 			 rp->name, rd->name);
-		powercap_unregister_zone(control_type, &rd->power_zone);
+		powercap_unregister_zone(rp->priv->control_type, &rd->power_zone);
 	}
 	/* do parent zone last */
-	powercap_unregister_zone(control_type, &rd_package->power_zone);
+	powercap_unregister_zone(rp->priv->control_type, &rd_package->power_zone);
 	list_del(&rp->plist);
 	kfree(rp);
 }
 
 /* called from CPU hotplug notifier, hotplug lock held */
-static struct rapl_package *rapl_add_package(int cpu)
+static struct rapl_package *rapl_add_package(int cpu, struct rapl_priv *priv)
 {
 	int id = topology_logical_die_id(cpu);
 	struct rapl_package *rp;
@@ -1361,6 +1360,7 @@ static struct rapl_package *rapl_add_package(int cpu)
 	/* add the new package to the list */
 	rp->id = id;
 	rp->lead_cpu = cpu;
+	rp->priv = priv;
 
 	if (topology_max_die_per_package() > 1)
 		snprintf(rp->name, PACKAGE_DOMAIN_NAME_LENGTH,
@@ -1399,9 +1399,9 @@ static int rapl_cpu_online(unsigned int cpu)
 {
 	struct rapl_package *rp;
 
-	rp = rapl_find_package_domain(cpu);
+	rp = rapl_find_package_domain(cpu, &rapl_msr_priv);
 	if (!rp) {
-		rp = rapl_add_package(cpu);
+		rp = rapl_add_package(cpu, &rapl_msr_priv);
 		if (IS_ERR(rp))
 			return PTR_ERR(rp);
 	}
@@ -1414,7 +1414,7 @@ static int rapl_cpu_down_prep(unsigned int cpu)
 	struct rapl_package *rp;
 	int lead_cpu;
 
-	rp = rapl_find_package_domain(cpu);
+	rp = rapl_find_package_domain(cpu, &rapl_msr_priv);
 	if (!rp)
 		return 0;
 
@@ -1427,8 +1427,6 @@ static int rapl_cpu_down_prep(unsigned int cpu)
 	return 0;
 }
 
-static enum cpuhp_state pcap_rapl_online;
-
 static void power_limit_state_save(void)
 {
 	struct rapl_package *rp;
@@ -1538,7 +1536,7 @@ static int __init rapl_init(void)
 				rapl_cpu_online, rapl_cpu_down_prep);
 	if (ret < 0)
 		goto err_unreg;
-	pcap_rapl_online = ret;
+	rapl_msr_priv.pcap_rapl_online = ret;
 
 	/* Don't bail out if PSys is not supported */
 	rapl_register_psys();
@@ -1550,7 +1548,7 @@ static int __init rapl_init(void)
 	return 0;
 
 err_unreg_all:
-	cpuhp_remove_state(pcap_rapl_online);
+	cpuhp_remove_state(rapl_msr_priv.pcap_rapl_online);
 
 err_unreg:
 	rapl_unregister_powercap();
@@ -1560,7 +1558,7 @@ static int __init rapl_init(void)
 static void __exit rapl_exit(void)
 {
 	unregister_pm_notifier(&rapl_pm_notifier);
-	cpuhp_remove_state(pcap_rapl_online);
+	cpuhp_remove_state(rapl_msr_priv.pcap_rapl_online);
 	rapl_unregister_powercap();
 }
 
diff --git a/include/linux/intel_rapl.h b/include/linux/intel_rapl.h
index 9471603..d6a8547 100644
--- a/include/linux/intel_rapl.h
+++ b/include/linux/intel_rapl.h
@@ -88,6 +88,12 @@ struct rapl_domain {
 	struct rapl_package *rp;
 };
 
+struct rapl_priv {
+	struct powercap_control_type *control_type;
+	struct rapl_domain *platform_rapl_domain;
+	enum cpuhp_state pcap_rapl_online;
+};
+
 /* maximum rapl package domain name: package-%d-die-%d */
 #define PACKAGE_DOMAIN_NAME_LENGTH 30
 
@@ -108,6 +114,7 @@ struct rapl_package {
 	/* Track active cpus */
 	struct cpumask cpumask;
 	char name[PACKAGE_DOMAIN_NAME_LENGTH];
+	struct rapl_priv *priv;
 };
 
 #endif /* __INTEL_RAPL_H__ */
-- 
2.7.4