[PATCH 19/31] drm/i915/slpc: Allocate/Release/Initialize SLPC shared data

Sagar Arun Kamble
2017-09-19T17:39:19Z

Populate SLPC shared data with required default values for
Slice count, Power source/plan, IA Perf MSRs.

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.

v3: Fixing WARNING in igt@drv_module_reload_basic found in trybot BAT
with SLPC Enabled.

v4: Updated support for GuC v9. s/slice_total/hweight8(slice_mask)/(Dave).

v5: SLPC vma mapping changes and removed explicit type conversions.(Chris).
s/freq_unslice_max|min/unslice__max|min_freq.

v6: Commit message update. s/msr_value/val for reuse later.

v7: Set default values for tasks and min frequency parameters.
Moved initialization with allocation of data so that post GuC load
earlier parameters persist.

v8: Added check for SLPC status during cleanup of shared data. SLPC
disabling is asynchronous and should complete within 10us.

v9: Enabling Balancer task in SLPC.

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 | 1 +
drivers/gpu/drm/i915/intel_pm.c | 2 +-
drivers/gpu/drm/i915/intel_slpc.c | 167 ++++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_slpc.h | 1 +
4 files changed, 170 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 0cf04eb..df3d544 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1876,6 +1876,7 @@ bool chv_phy_powergate_ch(struct drm_i915_private *dev_priv, enum dpio_phy phy,
void gen6_rps_idle(struct drm_i915_private *dev_priv);
void gen6_rps_boost(struct drm_i915_gem_request *rq,
struct intel_rps_client *rps);
+void gen6_init_rps_frequencies(struct drm_i915_private *dev_priv);
void g4x_wm_get_hw_state(struct drm_device *dev);
void vlv_wm_get_hw_state(struct drm_device *dev);
void ilk_wm_get_hw_state(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index e5607e5..6b2b7f8 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -6486,7 +6486,7 @@ int sanitize_rc6_option(struct drm_i915_private *dev_priv, int enable_rc6)
return INTEL_RC6_ENABLE;
}

-static void gen6_init_rps_frequencies(struct drm_i915_private *dev_priv)
+void gen6_init_rps_frequencies(struct drm_i915_private *dev_priv)
{
/* All of these values are in units of 50MHz */

diff --git a/drivers/gpu/drm/i915/intel_slpc.c b/drivers/gpu/drm/i915/intel_slpc.c
index a3db63c..73e7bf5 100644
--- a/drivers/gpu/drm/i915/intel_slpc.c
+++ b/drivers/gpu/drm/i915/intel_slpc.c
@@ -22,6 +22,7 @@
*
*/
#include <linux/firmware.h>
+#include <asm/msr-index.h>
#include "i915_drv.h"
#include "intel_uc.h"

@@ -64,12 +65,178 @@ struct slpc_param slpc_paramlist[SLPC_MAX_PARAM] = {
"Enable IBC when non-Gaming Mode is enabled"}
};

+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 = hweight8(INTEL_INFO(dev_priv)->sseu.slice_mask);
+
+ return slice_count;
+}
+
+void slpc_mem_set_param(struct slpc_shared_data *data,
+ u32 id,
+ u32 value)
+{
+ data->override_parameters_set_bits[id >> 5]
+ |= (1 << (id % 32));
+ data->override_parameters_values[id] = value;
+}
+
+void slpc_mem_unset_param(struct slpc_shared_data *data,
+ u32 id)
+{
+ data->override_parameters_set_bits[id >> 5]
+ &= (~(1 << (id % 32)));
+ data->override_parameters_values[id] = 0;
+}
+
+int slpc_mem_task_control(struct slpc_shared_data *data, u64 val,
+ u32 enable_id, u32 disable_id)
+{
+ int ret = 0;
+
+ if (val == SLPC_PARAM_TASK_DEFAULT) {
+ /* set default */
+ slpc_mem_unset_param(data, enable_id);
+ slpc_mem_unset_param(data, disable_id);
+ } else if (val == SLPC_PARAM_TASK_ENABLED) {
+ /* set enable */
+ slpc_mem_set_param(data, enable_id, 1);
+ slpc_mem_unset_param(data, disable_id);
+ } else if (val == SLPC_PARAM_TASK_DISABLED) {
+ /* set disable */
+ slpc_mem_set_param(data, disable_id, 1);
+ slpc_mem_unset_param(data, enable_id);
+ } else {
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static void slpc_shared_data_init(struct intel_slpc *slpc)
+{
+ struct drm_i915_private *dev_priv = slpc_to_i915(slpc);
+ struct page *page;
+ struct slpc_shared_data *data;
+ u64 val;
+
+ page = i915_vma_first_page(slpc->vma);
+ data = kmap_atomic(page);
+
+ memset(data, 0, sizeof(struct slpc_shared_data));
+
+ data->shared_data_size = sizeof(struct slpc_shared_data);
+ data->global_state = SLPC_GLOBAL_STATE_NOT_RUNNING;
+ data->platform_info.platform_sku =
+ slpc_get_platform_sku(dev_priv);
+ data->platform_info.slice_count =
+ slpc_get_slice_count(dev_priv);
+ data->platform_info.power_plan_source =
+ SLPC_POWER_PLAN_SOURCE(SLPC_POWER_PLAN_BALANCED,
+ SLPC_POWER_SOURCE_AC);
+ rdmsrl(MSR_TURBO_RATIO_LIMIT, val);
+ data->platform_info.P0_freq = val;
+ rdmsrl(MSR_PLATFORM_INFO, val);
+ data->platform_info.P1_freq = val >> 8;
+ data->platform_info.Pe_freq = val >> 40;
+ data->platform_info.Pn_freq = val >> 48;
+
+ /* Enable only GTPERF task, Disable others */
+ val = SLPC_PARAM_TASK_ENABLED;
+ slpc_mem_task_control(data, val,
+ SLPC_PARAM_TASK_ENABLE_GTPERF,
+ SLPC_PARAM_TASK_DISABLE_GTPERF);
+
+ slpc_mem_task_control(data, val,
+ SLPC_PARAM_TASK_ENABLE_BALANCER,
+ SLPC_PARAM_TASK_DISABLE_BALANCER);
+
+ val = SLPC_PARAM_TASK_DISABLED;
+ slpc_mem_task_control(data, val,
+ SLPC_PARAM_TASK_ENABLE_DCC,
+ SLPC_PARAM_TASK_DISABLE_DCC);
+
+ slpc_mem_set_param(data, SLPC_PARAM_GTPERF_THRESHOLD_MAX_FPS, 0);
+
+ slpc_mem_set_param(data, SLPC_PARAM_GTPERF_ENABLE_FRAMERATE_STALLING,
+ 0);
+
+ slpc_mem_set_param(data, SLPC_PARAM_GLOBAL_ENABLE_IA_GT_BALANCING,
+ 1);
+
+ slpc_mem_set_param(data,
+ SLPC_PARAM_GLOBAL_ENABLE_ADAPTIVE_BURST_TURBO,
+ 0);
+
+ slpc_mem_set_param(data, SLPC_PARAM_GLOBAL_ENABLE_EVAL_MODE, 0);
+
+ slpc_mem_set_param(data,
+ SLPC_PARAM_GLOBAL_ENABLE_BALANCER_IN_NON_GAMING_MODE,
+ 1);
+
+ slpc_mem_set_param(data,
+ SLPC_PARAM_GLOBAL_MIN_GT_UNSLICE_FREQ_MHZ,
+ intel_gpu_freq(dev_priv,
+ dev_priv->pm.rps.efficient_freq));
+ slpc_mem_set_param(data,
+ SLPC_PARAM_GLOBAL_MIN_GT_SLICE_FREQ_MHZ,
+ intel_gpu_freq(dev_priv,
+ dev_priv->pm.rps.efficient_freq));
+
+ kunmap_atomic(data);
+}
+
void intel_slpc_init(struct intel_slpc *slpc)
{
+ struct intel_guc *guc = slpc_to_guc(slpc);
+ struct drm_i915_private *dev_priv = slpc_to_i915(slpc);
+ struct i915_vma *vma;
+
+ slpc->active = false;
+
+ mutex_lock(&dev_priv->pm.pcu_lock);
+ gen6_init_rps_frequencies(dev_priv);
+ mutex_unlock(&dev_priv->pm.pcu_lock);
+
+ /* Allocate shared data structure */
+ vma = slpc->vma;
+ if (!vma) {
+ vma = intel_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;
+ }
+
+ slpc->vma = vma;
+ slpc_shared_data_init(slpc);
+ }
}

void intel_slpc_cleanup(struct intel_slpc *slpc)
{
+ /* Release shared data structure */
+ i915_vma_unpin_and_release(&slpc->vma);
}

void intel_slpc_enable(struct intel_slpc *slpc)
diff --git a/drivers/gpu/drm/i915/intel_slpc.h b/drivers/gpu/drm/i915/intel_slpc.h
index ac4cb65..9312b2f 100644
--- a/drivers/gpu/drm/i915/intel_slpc.h
+++ b/drivers/gpu/drm/i915/intel_slpc.h
@@ -26,6 +26,7 @@

struct intel_slpc {
bool active;
+ struct i915_vma *vma;
};

static inline int intel_slpc_enabled(void)