drm/i915/slpc: Allocate/Release/Initialize SLPC shared data

From: Sagar Arun Kamble <sagar.a.kamble@intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: Tom O'Rourke <Tom.O'Rourke@intel.com>
Subject: drm/i915/slpc: Allocate/Release/Initialize SLPC shared data
Date: Sun, 21 Aug 2016 11:50:03 +0530	[thread overview]
Message-ID: <1471760418-27509-11-git-send-email-sagar.a.kamble@intel.com> (raw)
In-Reply-To: <1471760418-27509-1-git-send-email-sagar.a.kamble@intel.com>

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

SLPC shared data is used to pass information
to/from SLPC in GuC 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.

v1: Update for SLPC interface version 2015.2.4
    intel_slpc_active() returns 1 if slpc initialized (Paulo)
    change default host_os to "Windows"
    Spelling fixes (Sagar Kamble and Nick Hoath)
    Added WARN for checking if upper 32bits of GTT offset
    of shared object are zero. (ChrisW)
    Changed function call from gem_allocate/release_guc_obj to
    i915_guc_allocate/release_gem_obj. (Sagar)
    Updated commit message and moved POWER_PLAN and POWER_SOURCE
    definition from later patch. (Akash)
    Add struct_mutex locking while allocating/releasing slpc shared
    object. This was caught by CI BAT. Adding SLPC state variable
    to determine if it is active as it not just dependent on shared
    data setup.
    Rebase with guc_allocate_vma related changes.

v2: WARN_ON for platform_sku validity and space changes. (David)
    Checkpatch update.

Reviewed-by: David Weinehall <david.weinehall@linux.intel.com>
Signed-off-by: Tom O'Rourke <Tom.O'Rourke@intel.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
---
 drivers/gpu/drm/i915/intel_drv.h  |  7 ++-
 drivers/gpu/drm/i915/intel_guc.h  |  2 +
 drivers/gpu/drm/i915/intel_pm.c   |  6 ++-
 drivers/gpu/drm/i915/intel_slpc.c | 92 +++++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_slpc.h | 78 +++++++++++++++++++++++++++++++++
 5 files changed, 182 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 353cb51..af96012 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1694,7 +1694,12 @@ bool chv_phy_powergate_ch(struct drm_i915_private *dev_priv, enum dpio_phy phy,
 
 static inline int intel_slpc_active(struct drm_i915_private *dev_priv)
 {
-	return 0;
+	int ret = 0;
+
+	if (dev_priv->guc.slpc.vma && dev_priv->guc.slpc.enabled)
+		ret = 1;
+
+	return ret;
 }
 
 /* intel_pm.c */
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index 6fdbac5..af4310c 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -145,6 +145,8 @@ struct intel_guc {
 
 	uint64_t submissions[I915_NUM_ENGINES];
 	uint32_t last_seqno[I915_NUM_ENGINES];
+
+	struct intel_slpc slpc;
 };
 
 static inline int intel_slpc_enabled(void)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 14c29b1..0c739c6 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -6572,7 +6572,8 @@ void intel_init_gt_powersave(struct drm_i915_private *dev_priv)
 
 void intel_cleanup_gt_powersave(struct drm_i915_private *dev_priv)
 {
-	if (intel_slpc_enabled())
+	if (intel_slpc_enabled() &&
+	    dev_priv->guc.slpc.vma)
 		intel_slpc_cleanup(dev_priv);
 	else if (IS_VALLEYVIEW(dev_priv))
 		valleyview_cleanup_gt_powersave(dev_priv);
@@ -6662,7 +6663,8 @@ void intel_enable_gt_powersave(struct drm_i915_private *dev_priv)
 
 	mutex_lock(&dev_priv->rps.hw_lock);
 
-	if (intel_slpc_enabled()) {
+	if (intel_slpc_enabled() &&
+	    dev_priv->guc.slpc.vma) {
 		gen9_enable_rc6(dev_priv);
 		intel_slpc_enable(dev_priv);
 		if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv))
diff --git a/drivers/gpu/drm/i915/intel_slpc.c b/drivers/gpu/drm/i915/intel_slpc.c
index 2e509a7..bb2e5fe 100644
--- a/drivers/gpu/drm/i915/intel_slpc.c
+++ b/drivers/gpu/drm/i915/intel_slpc.c
@@ -22,15 +22,107 @@
  *
  */
 #include <linux/firmware.h>
+#include <asm/msr-index.h>
 #include "i915_drv.h"
 #include "intel_guc.h"
 
+static unsigned int slpc_get_platform_sku(struct drm_i915_private *dev_priv)
+{
+	enum slpc_platform_sku platform_sku;
+
+	if (IS_SKL_ULX(dev_priv))
+		platform_sku = SLPC_PLATFORM_SKU_ULX;
+	else if (IS_SKL_ULT(dev_priv))
+		platform_sku = SLPC_PLATFORM_SKU_ULT;
+	else
+		platform_sku = SLPC_PLATFORM_SKU_DT;
+
+	WARN_ON(platform_sku > 0xFF);
+
+	return platform_sku;
+}
+
+static unsigned int slpc_get_slice_count(struct drm_i915_private *dev_priv)
+{
+	unsigned int slice_count = 1;
+
+	if (IS_SKYLAKE(dev_priv))
+		slice_count = INTEL_INFO(dev_priv)->slice_total;
+
+	return slice_count;
+}
+
+static void slpc_shared_data_init(struct drm_i915_private *dev_priv)
+{
+	struct drm_i915_gem_object *obj;
+	struct page *page;
+	struct slpc_shared_data *data;
+	u64 msr_value;
+
+	if (!dev_priv->guc.slpc.vma)
+		return;
+
+	obj = dev_priv->guc.slpc.vma->obj;
+
+	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 =
+					(u8)slpc_get_platform_sku(dev_priv);
+		data->platform_info.slice_count =
+					(u8)slpc_get_slice_count(dev_priv);
+		data->platform_info.host_os = (u8)SLPC_HOST_OS_WINDOWS_8;
+		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);
+	}
+}
+
 void intel_slpc_init(struct drm_i915_private *dev_priv)
 {
+	struct intel_guc *guc = &dev_priv->guc;
+	struct i915_vma *vma;
+
+	/* Allocate shared data structure */
+	vma = dev_priv->guc.slpc.vma;
+	if (!vma) {
+		vma = guc_allocate_vma(guc,
+			       PAGE_ALIGN(sizeof(struct slpc_shared_data)));
+		if (IS_ERR(vma)) {
+			DRM_ERROR("slpc_shared_data allocation failed\n");
+			i915.enable_slpc = 0;
+			return;
+		}
+
+		dev_priv->guc.slpc.vma = vma;
+	}
+
+	slpc_shared_data_init(dev_priv);
 }
 
 void intel_slpc_cleanup(struct drm_i915_private *dev_priv)
 {
+	struct intel_guc *guc = &dev_priv->guc;
+
+	/* Release shared data structure */
+	i915_vma_unpin_and_release(&guc->slpc.vma);
 }
 
 void intel_slpc_suspend(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/intel_slpc.h b/drivers/gpu/drm/i915/intel_slpc.h
index ae52146..e951289 100644
--- a/drivers/gpu/drm/i915/intel_slpc.h
+++ b/drivers/gpu/drm/i915/intel_slpc.h
@@ -24,6 +24,84 @@
 #ifndef _INTEL_SLPC_H_
 #define _INTEL_SLPC_H_
 
+#define SLPC_MAJOR_VER 2
+#define SLPC_MINOR_VER 4
+#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_RESETTING = 2,
+	SLPC_GLOBAL_STATE_RUNNING = 3,
+	SLPC_GLOBAL_STATE_SHUTTING_DOWN = 4,
+	SLPC_GLOBAL_STATE_ERROR = 5
+};
+
+enum slpc_host_os {
+	SLPC_HOST_OS_UNDEFINED = 0,
+	SLPC_HOST_OS_WINDOWS_8 = 1,
+};
+
+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))
+#define SLPC_POWER_PLAN(plan_source) ((plan_source) & 0x3F)
+#define SLPC_POWER_SOURCE(plan_source) ((plan_source) >> 6)
+
+struct slpc_platform_info {
+	u8 platform_sku;
+	u8 slice_count;
+	u8 host_os;
+	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 192
+#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 i915_vma *vma;
+	bool enabled;
+};
+
 /* intel_slpc.c */
 void intel_slpc_init(struct drm_i915_private *dev_priv);
 void intel_slpc_cleanup(struct drm_i915_private *dev_priv);
-- 
1.9.1

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