tools/power/x86/intel-speed-select: Add support for core-power discovery

It is possible that BIOS may not enable core-power feature. In this case
this additional interface will allow to enable from this utility. Also
the information dump, includes the current status of core-power.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

3 files changed, 72 insertions, 0 deletions

diff --git a/tools/power/x86/intel-speed-select/isst-core.c b/tools/power/x86/intel-speed-select/isst-core.c
index d14c7bcd327a..81a119f688a3 100644
--- a/tools/power/x86/intel-speed-select/isst-core.c
+++ b/tools/power/x86/intel-speed-select/isst-core.c
@@ -6,6 +6,44 @@
 
 #include "isst.h"
 
+int isst_write_pm_config(int cpu, int cp_state)
+{
+	unsigned int req, resp;
+	int ret;
+
+	if (cp_state)
+		req = BIT(16);
+	else
+		req = 0;
+
+	ret = isst_send_mbox_command(cpu, WRITE_PM_CONFIG, PM_FEATURE, 0, req,
+				     &resp);
+	if (ret)
+		return ret;
+
+	debug_printf("cpu:%d WRITE_PM_CONFIG resp:%x\n", cpu, resp);
+
+	return 0;
+}
+
+int isst_read_pm_config(int cpu, int *cp_state, int *cp_cap)
+{
+	unsigned int resp;
+	int ret;
+
+	ret = isst_send_mbox_command(cpu, READ_PM_CONFIG, PM_FEATURE, 0, 0,
+				     &resp);
+	if (ret)
+		return ret;
+
+	debug_printf("cpu:%d READ_PM_CONFIG resp:%x\n", cpu, resp);
+
+	*cp_state = resp & BIT(16);
+	*cp_cap = resp & BIT(0) ? 1 : 0;
+
+	return 0;
+}
+
 int isst_get_ctdp_levels(int cpu, struct isst_pkg_ctdp *pkg_dev)
 {
 	unsigned int resp;
@@ -36,6 +74,7 @@ int isst_get_ctdp_levels(int cpu, struct isst_pkg_ctdp *pkg_dev)
 int isst_get_ctdp_control(int cpu, int config_index,
 			  struct isst_pkg_ctdp_level_info *ctdp_level)
 {
+	int cp_state, cp_cap;
 	unsigned int resp;
 	int ret;
 
@@ -50,6 +89,15 @@ int isst_get_ctdp_control(int cpu, int config_index,
 	ctdp_level->fact_enabled = !!(resp & BIT(16));
 	ctdp_level->pbf_enabled = !!(resp & BIT(17));
 
+	ret = isst_read_pm_config(cpu, &cp_state, &cp_cap);
+	if (ret) {
+		debug_printf("cpu:%d pm_config is not supported \n", cpu);
+	} else {
+		debug_printf("cpu:%d pm_config SST-CP state:%d cap:%d \n", cpu, cp_state, cp_cap);
+		ctdp_level->sst_cp_support = cp_cap;
+		ctdp_level->sst_cp_enabled = cp_state;
+	}
+
 	debug_printf(
 		"cpu:%d CONFIG_TDP_GET_TDP_CONTROL resp:%x fact_support:%d pbf_support: %d fact_enabled:%d pbf_enabled:%d\n",
 		cpu, resp, ctdp_level->fact_support, ctdp_level->pbf_support,
@@ -779,6 +827,13 @@ int isst_pm_qos_config(int cpu, int enable_clos, int priority_type)
 			debug_printf("Turbo-freq feature must be disabled first\n");
 			return -EINVAL;
 		}
+		ret = isst_write_pm_config(cpu, 0);
+		if (ret)
+			perror("isst_write_pm_config\n");
+	} else {
+		ret = isst_write_pm_config(cpu, 1);
+		if (ret)
+			perror("isst_write_pm_config\n");
 	}
 
 	ret = isst_send_mbox_command(cpu, CONFIG_CLOS, CLOS_PM_QOS_CONFIG, 0, 0,
diff --git a/tools/power/x86/intel-speed-select/isst-display.c b/tools/power/x86/intel-speed-select/isst-display.c
index 040dd09d5eee..1d1439036c12 100644
--- a/tools/power/x86/intel-speed-select/isst-display.c
+++ b/tools/power/x86/intel-speed-select/isst-display.c
@@ -418,6 +418,17 @@ void isst_ctdp_display_information(int cpu, FILE *outf, int tdp_level,
 			snprintf(value, sizeof(value), "unsupported");
 		format_and_print(outf, base_level + 4, header, value);
 
+		snprintf(header, sizeof(header),
+			 "speed-select-core-power");
+		if (ctdp_level->sst_cp_support) {
+			if (ctdp_level->sst_cp_enabled)
+				snprintf(value, sizeof(value), "enabled");
+			else
+				snprintf(value, sizeof(value), "disabled");
+		} else
+			snprintf(value, sizeof(value), "unsupported");
+		format_and_print(outf, base_level + 4, header, value);
+
 		if (is_clx_n_platform()) {
 			if (ctdp_level->pbf_support)
 				_isst_pbf_display_information(cpu, outf,
diff --git a/tools/power/x86/intel-speed-select/isst.h b/tools/power/x86/intel-speed-select/isst.h
index cdf0f8a6dbbf..ad5aa6341d0f 100644
--- a/tools/power/x86/intel-speed-select/isst.h
+++ b/tools/power/x86/intel-speed-select/isst.h
@@ -69,6 +69,10 @@
 #define PM_CLOS_OFFSET				0x08
 #define PQR_ASSOC_OFFSET			0x20
 
+#define READ_PM_CONFIG				0x94
+#define WRITE_PM_CONFIG				0x95
+#define PM_FEATURE				0x03
+
 #define DISP_FREQ_MULTIPLIER 100
 
 struct isst_clos_config {
@@ -119,6 +123,8 @@ struct isst_pkg_ctdp_level_info {
 	int pbf_support;
 	int fact_enabled;
 	int pbf_enabled;
+	int sst_cp_support;
+	int sst_cp_enabled;
 	int tdp_ratio;
 	int active;
 	int tdp_control;