[PATCH 08/25] drm/i915/slpc: Allocate/Release/Initialize SLPC shared data

tom.orourke
2016-04-06T19:24:56Z

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.

v2: Update for SLPC interface version 2015.2.4
intel_slpc_active() returns 1 if slpc initialized (Paulo)
v3: change default host_os to "Windows"

Signed-off-by: Tom O'Rourke <Tom.O'Rourke@intel.com>
---
drivers/gpu/drm/i915/intel_drv.h | 9 ++++-
drivers/gpu/drm/i915/intel_guc.h | 2 +
drivers/gpu/drm/i915/intel_slpc.c | 84 ++++++++++++++++++++++++++++++++++++++-
drivers/gpu/drm/i915/intel_slpc.h | 75 ++++++++++++++++++++++++++++++++++
4 files changed, 167 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 80c030a..784dafb 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1575,9 +1575,16 @@ bool chv_phy_powergate_ch(struct drm_i915_private *dev_priv, enum dpio_phy phy,

static inline int intel_slpc_active(struct drm_device *dev)
{
- return 0;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ int ret = 0;
+
+ if (dev_priv->guc.slpc.shared_data_obj)
+ ret = 1;
+
+ return ret;
}

+
/* intel_pm.c */
void intel_init_clock_gating(struct drm_device *dev);
void intel_suspend_hw(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index 417cc82..62075db 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -109,6 +109,8 @@ struct intel_guc {

uint64_t submissions[GUC_MAX_ENGINES_NUM];
uint32_t last_seqno[GUC_MAX_ENGINES_NUM];
+
+ struct intel_slpc slpc;
};

static inline int intel_slpc_enabled(void)
diff --git a/drivers/gpu/drm/i915/intel_slpc.c b/drivers/gpu/drm/i915/intel_slpc.c
index 474fac0..9f3e727 100644
--- a/drivers/gpu/drm/i915/intel_slpc.c
+++ b/drivers/gpu/drm/i915/intel_slpc.c
@@ -22,17 +22,97 @@
*
*/
#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 void slpc_shared_data_init(struct drm_i915_gem_object *obj)
+{
+ struct page *page;
+ struct slpc_shared_data *data;
+ u64 msr_value;
+
+ 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.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_device *dev)
{
- return;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct drm_i915_gem_object *obj;
+
+ /* 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)
+ DRM_ERROR("slpc_shared_data allocation failed\n");
+ else
+ slpc_shared_data_init(obj);
}

void intel_slpc_cleanup(struct drm_device *dev)
{
- return;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ /* Release shared data sturcutre */
+ gem_release_guc_obj(dev_priv->guc.slpc.shared_data_obj);
+ dev_priv->guc.slpc.shared_data_obj = NULL;
}

void 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 6cfadb3..94cd2f4 100644
--- a/drivers/gpu/drm/i915/intel_slpc.h
+++ b/drivers/gpu/drm/i915/intel_slpc.h
@@ -24,6 +24,81 @@
#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_RESETING = 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))
+
+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 drm_i915_gem_object *shared_data_obj;
+};
+
/* intel_slpc.c */
void intel_slpc_init(struct drm_device *dev);
void intel_slpc_cleanup(struct drm_device *dev);