[RFC 08/22] drm/i915/slpc: Allocate/Release/Initialize SLPC shared data

[tom.orourke@intel.com]

From: Tom O'Rourke <Tom.O'Rourke@intel.com>

SLPC shared data is used to pass information
to/from SLPC firmware.

For Skylake, platform sku type and slice count
are identified from device id and fuse values.

Support for other platforms needs to be added.

Signed-off-by: Tom O'Rourke <Tom.O'Rourke@intel.com>
---
 drivers/gpu/drm/i915/intel_guc.h  |  3 ++
 drivers/gpu/drm/i915/intel_slpc.c | 93 ++++++++++++++++++++++++++++++++++++++-
 drivers/gpu/drm/i915/intel_slpc.h | 69 +++++++++++++++++++++++++++++
 3 files changed, 163 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index e5de759..23cbcc1 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -26,6 +26,7 @@
 
 #include "intel_guc_fwif.h"
 #include "i915_guc_reg.h"
+#include "intel_slpc.h"
 
 struct i915_guc_client {
 	struct drm_i915_gem_object *client_obj;
@@ -108,6 +109,8 @@ struct intel_guc {
 
 	uint64_t submissions[I915_NUM_RINGS];
 	uint32_t last_seqno[I915_NUM_RINGS];
+
+	struct intel_slpc slpc;
 };
 
 /* intel_guc_loader.c */
diff --git a/drivers/gpu/drm/i915/intel_slpc.c b/drivers/gpu/drm/i915/intel_slpc.c
index dcd237f..c298a6c 100644
--- a/drivers/gpu/drm/i915/intel_slpc.c
+++ b/drivers/gpu/drm/i915/intel_slpc.c
@@ -22,21 +22,110 @@
  *
  */
 #include <linux/firmware.h>
+#include <asm/msr-index.h>
 #include "i915_drv.h"
 #include "intel_guc.h"
 
+static u8 slpc_get_platform_sku(struct drm_i915_gem_object *obj)
+{
+	struct drm_device *dev = obj->base.dev;
+	enum slpc_platform_sku platform_sku;
+
+	if (IS_SKL_ULX(dev))
+		platform_sku = SLPC_PLATFORM_SKU_ULX;
+	else if (IS_SKL_ULT(dev))
+		platform_sku = SLPC_PLATFORM_SKU_ULT;
+	else
+		platform_sku = SLPC_PLATFORM_SKU_DT;
+
+	return (u8) platform_sku;
+}
+
+static u8 slpc_get_slice_count(struct drm_i915_gem_object *obj)
+{
+	struct drm_device *dev = obj->base.dev;
+	u8 slice_count = 1;
+
+	if (IS_SKYLAKE(dev))
+		slice_count = INTEL_INFO(dev)->slice_total;
+
+	return slice_count;
+}
+
+static int slpc_shared_data_init(struct drm_i915_gem_object *obj)
+{
+	struct page *page;
+	struct slpc_shared_data *data;
+	u64 msr_value;
+	int ret = 0;
+
+	page = i915_gem_object_get_page(obj, 0);
+	if (page) {
+		data = kmap_atomic(page);
+		memset(data, 0, sizeof(struct slpc_shared_data));
+
+		data->slpc_version = SLPC_VERSION;
+		data->shared_data_size = sizeof(struct slpc_shared_data);
+		data->global_state = (u32) SLPC_GLOBAL_STATE_NOT_RUNNING;
+		data->platform_info.platform_sku = slpc_get_platform_sku(obj);
+		data->platform_info.slice_count = slpc_get_slice_count(obj);
+		data->platform_info.power_plan_source =
+			(u8) SLPC_POWER_PLAN_SOURCE(SLPC_POWER_PLAN_BALANCED,
+						    SLPC_POWER_SOURCE_AC);
+		rdmsrl(MSR_TURBO_RATIO_LIMIT, msr_value);
+		data->platform_info.P0_freq = (u8) msr_value;
+		rdmsrl(MSR_PLATFORM_INFO, msr_value);
+		data->platform_info.P1_freq = (u8) (msr_value >> 8);
+		data->platform_info.Pe_freq = (u8) (msr_value >> 40);
+		data->platform_info.Pn_freq = (u8) (msr_value >> 48);
+		rdmsrl(MSR_PKG_POWER_LIMIT, msr_value);
+		data->platform_info.package_rapl_limit_high =
+							(u32) (msr_value >> 32);
+		data->platform_info.package_rapl_limit_low = (u32) msr_value;
+
+		kunmap_atomic(data);
+	}
+
+	return ret;
+}
+
 int intel_slpc_init(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct drm_i915_gem_object *obj;
+	int ret = 0;
 
-	return 0;
+	/* Allocate shared data structure */
+	obj = dev_priv->guc.slpc.shared_data_obj;
+	if (!obj) {
+		obj = gem_allocate_guc_obj(dev_priv->dev,
+				PAGE_ALIGN(sizeof(struct slpc_shared_data)));
+		dev_priv->guc.slpc.shared_data_obj = obj;
+	}
+
+	if (!obj) {
+		ret = -ENOMEM;
+	} else {
+		ret = slpc_shared_data_init(obj);
+	}
+
+	return ret;
 }
 
 int intel_slpc_cleanup(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct drm_i915_gem_object *obj;
+	int ret = 0;
 
-	return 0;
+	/* Release shared data sturcutre */
+	obj = dev_priv->guc.slpc.shared_data_obj;
+	if (obj) {
+		gem_release_guc_obj(obj);
+		dev_priv->guc.slpc.shared_data_obj = NULL;
+	}
+
+	return ret;
 }
 
 int intel_slpc_suspend(struct drm_device *dev)
diff --git a/drivers/gpu/drm/i915/intel_slpc.h b/drivers/gpu/drm/i915/intel_slpc.h
index 8f13fb5..dceef7e 100644
--- a/drivers/gpu/drm/i915/intel_slpc.h
+++ b/drivers/gpu/drm/i915/intel_slpc.h
@@ -24,6 +24,75 @@
 #ifndef _INTEL_SLPC_H_
 #define _INTEL_SLPC_H_
 
+#define SLPC_MAJOR_VER 2
+#define SLPC_MINOR_VER 3
+#define SLPC_VERSION ((2015 << 16) | (SLPC_MAJOR_VER << 8) | (SLPC_MINOR_VER))
+
+enum slpc_global_state {
+	SLPC_GLOBAL_STATE_NOT_RUNNING = 0,
+	SLPC_GLOBAL_STATE_INITIALIZING = 1,
+	SLPC_GLOBAL_STATE_RESETING = 2,
+	SLPC_GLOBAL_STATE_RUNNING = 3,
+	SLPC_GLOBAL_STATE_SHUTTING_DOWN = 4,
+	SLPC_GLOBAL_STATE_ERROR = 5
+};
+
+enum slpc_platform_sku {
+	SLPC_PLATFORM_SKU_UNDEFINED = 0,
+	SLPC_PLATFORM_SKU_ULX = 1,
+	SLPC_PLATFORM_SKU_ULT = 2,
+	SLPC_PLATFORM_SKU_T = 3,
+	SLPC_PLATFORM_SKU_MOBL = 4,
+	SLPC_PLATFORM_SKU_DT = 5,
+	SLPC_PLATFORM_SKU_UNKNOWN = 6,
+};
+
+enum slpc_power_plan {
+        SLPC_POWER_PLAN_UNDEFINED = 0,
+        SLPC_POWER_PLAN_BATTERY_SAVER = 1,
+        SLPC_POWER_PLAN_BALANCED = 2,
+        SLPC_POWER_PLAN_PERFORMANCE = 3,
+        SLPC_POWER_PLAN_UNKNOWN = 4,
+};
+
+enum slpc_power_source {
+        SLPC_POWER_SOURCE_UNDEFINED = 0,
+        SLPC_POWER_SOURCE_AC = 1,
+        SLPC_POWER_SOURCE_DC = 2,
+        SLPC_POWER_SOURCE_UNKNOWN = 3,
+};
+
+#define SLPC_POWER_PLAN_SOURCE(plan, source) ((plan) | ((source) << 6))
+
+struct slpc_platform_info {
+	u8 platform_sku;
+	u16 slice_count;
+	u8 power_plan_source;
+	u8 P0_freq;
+	u8 P1_freq;
+	u8 Pe_freq;
+	u8 Pn_freq;
+	u32 package_rapl_limit_high;
+	u32 package_rapl_limit_low;
+} __packed;
+
+#define SLPC_MAX_OVERRIDE_PARAMETERS 128
+#define SLPC_OVERRIDE_BITFIELD_SIZE ((SLPC_MAX_OVERRIDE_PARAMETERS + 31) / 32)
+
+struct slpc_shared_data {
+	u32 slpc_version;
+	u32 shared_data_size;
+	u32 global_state;
+	struct slpc_platform_info platform_info;
+	u32 task_state_data;
+	u32 override_parameters_set_bits[SLPC_OVERRIDE_BITFIELD_SIZE];
+	u32 override_parameters_values[SLPC_MAX_OVERRIDE_PARAMETERS];
+} __packed;
+
+struct intel_slpc {
+	struct drm_i915_gem_object *shared_data_obj;
+};
+
 /* intel_slpc.c */
 int intel_slpc_init(struct drm_device *dev);
 int intel_slpc_cleanup(struct drm_device *dev);
-- 
1.9.1

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