Re: [PATCH 12/14] drm/i915/guc/slpc: Sysfs hooks for SLPC

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On 7/21/2021 11:13 AM, Michal Wajdeczko wrote:


On 21.07.2021 18:11, Vinay Belgaumkar wrote:
Update the get/set min/max freq hooks to work for
SLPC case as well. Consolidate helpers for requested/min/max
frequency get/set to intel_rps where the proper action can
be taken depending on whether slpc is enabled.

s/slpc/SLPC

ok.



v2: Add wrappers for getting rp0/1/n frequencies, update
softlimits in set min/max slpc functions. Also check for
boundary conditions before setting them.

v3: Address review comments (Michal W)

Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@xxxxxxxxx>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>
Signed-off-by: Sujaritha Sundaresan <sujaritha.sundaresan@xxxxxxxxx>
---
  drivers/gpu/drm/i915/gt/intel_rps.c         | 165 ++++++++++++++++++++
  drivers/gpu/drm/i915/gt/intel_rps.h         |  11 ++
  drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c |  14 ++
  drivers/gpu/drm/i915/i915_pmu.c             |   2 +-
  drivers/gpu/drm/i915/i915_reg.h             |   2 +
  drivers/gpu/drm/i915/i915_sysfs.c           |  77 ++-------
  6 files changed, 207 insertions(+), 64 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_rps.c b/drivers/gpu/drm/i915/gt/intel_rps.c
index e858eeb2c59d..48d4147165a9 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.c
+++ b/drivers/gpu/drm/i915/gt/intel_rps.c
@@ -37,6 +37,13 @@ static struct intel_uncore *rps_to_uncore(struct intel_rps *rps)
  	return rps_to_gt(rps)->uncore;
  }
+static struct intel_guc_slpc *rps_to_slpc(struct intel_rps *rps)
+{
+	struct intel_gt *gt = rps_to_gt(rps);
+
+	return &gt->uc.guc.slpc;
+}
+
  static bool rps_uses_slpc(struct intel_rps *rps)
  {
  	struct intel_gt *gt = rps_to_gt(rps);
@@ -1960,6 +1967,164 @@ u32 intel_rps_read_actual_frequency(struct intel_rps *rps)
  	return freq;
  }
+u32 intel_rps_read_punit_req(struct intel_rps *rps)
+{
+	struct intel_uncore *uncore = rps_to_uncore(rps);
+
+	return intel_uncore_read(uncore, GEN6_RPNSWREQ);
+}
+
+u32 intel_rps_get_req(struct intel_rps *rps, u32 pureq)
+{
+	u32 req = pureq >> GEN9_SW_REQ_UNSLICE_RATIO_SHIFT;
+
+	return req;
+}
+
+u32 intel_rps_read_punit_req_frequency(struct intel_rps *rps)
+{
+	u32 freq = intel_rps_get_req(rps, intel_rps_read_punit_req(rps));
+
+	return intel_gpu_freq(rps, freq);
+}
+
+u32 intel_rps_get_requested_frequency(struct intel_rps *rps)
+{
+	if (rps_uses_slpc(rps))
+		return intel_rps_read_punit_req_frequency(rps);
+	else
+		return intel_gpu_freq(rps, rps->cur_freq);
+}
+
+u32 intel_rps_get_max_frequency(struct intel_rps *rps)
+{
+	struct intel_guc_slpc *slpc = rps_to_slpc(rps);
+
+	if (rps_uses_slpc(rps))
+		return slpc->max_freq_softlimit;
+	else
+		return intel_gpu_freq(rps, rps->max_freq_softlimit);
+}
+
+u32 intel_rps_get_rp0_frequency(struct intel_rps *rps)
+{
+	struct intel_guc_slpc *slpc = rps_to_slpc(rps);
+
+	if (rps_uses_slpc(rps))
+		return slpc->rp0_freq;
+	else
+		return intel_gpu_freq(rps, rps->rp0_freq);
+}
+
+u32 intel_rps_get_rp1_frequency(struct intel_rps *rps)
+{
+	struct intel_guc_slpc *slpc = rps_to_slpc(rps);
+
+	if (rps_uses_slpc(rps))
+		return slpc->rp1_freq;
+	else
+		return intel_gpu_freq(rps, rps->rp1_freq);
+}
+
+u32 intel_rps_get_rpn_frequency(struct intel_rps *rps)
+{
+	struct intel_guc_slpc *slpc = rps_to_slpc(rps);
+
+	if (rps_uses_slpc(rps))
+		return slpc->min_freq;
+	else
+		return intel_gpu_freq(rps, rps->min_freq);
+}
+
+int intel_rps_set_max_frequency(struct intel_rps *rps, u32 val)
+{
+	struct drm_i915_private *i915 = rps_to_i915(rps);
+	struct intel_guc_slpc *slpc = rps_to_slpc(rps);
+	int ret = 0;
+
+	if (rps_uses_slpc(rps))
+		return intel_guc_slpc_set_max_freq(slpc, val);
+
+	mutex_lock(&rps->lock);
+
+	val = intel_freq_opcode(rps, val);
+	if (val < rps->min_freq ||
+	    val > rps->max_freq ||
+	    val < rps->min_freq_softlimit) {
+		ret = -EINVAL;
+		goto unlock;
+	}
+
+	if (val > rps->rp0_freq)
+		drm_dbg(&i915->drm, "User requested overclocking to %d\n",
+			  intel_gpu_freq(rps, val));
+
+	rps->max_freq_softlimit = val;
+
+	val = clamp_t(int, rps->cur_freq,
+		      rps->min_freq_softlimit,
+		      rps->max_freq_softlimit);
+
+	/*
+	 * We still need *_set_rps to process the new max_delay and
+	 * update the interrupt limits and PMINTRMSK even though
+	 * frequency request may be unchanged.
+	 */
+	intel_rps_set(rps, val);
+
+unlock:
+	mutex_unlock(&rps->lock);
+
+	return ret;
+}
+
+u32 intel_rps_get_min_frequency(struct intel_rps *rps)
+{
+	struct intel_guc_slpc *slpc = rps_to_slpc(rps);
+
+	if (rps_uses_slpc(rps))
+		return slpc->min_freq_softlimit;
+	else
+		return intel_gpu_freq(rps, rps->min_freq_softlimit);
+}
+
+int intel_rps_set_min_frequency(struct intel_rps *rps, u32 val)
+{
+	struct intel_guc_slpc *slpc = rps_to_slpc(rps);
+	int ret = 0;
+
+	if (rps_uses_slpc(rps))
+		return intel_guc_slpc_set_min_freq(slpc, val);
+
+	mutex_lock(&rps->lock);
+
+	val = intel_freq_opcode(rps, val);
+	if (val < rps->min_freq ||
+	    val > rps->max_freq ||
+	    val > rps->max_freq_softlimit) {
+		ret = -EINVAL;
+		goto unlock;
+	}
+
+	rps->min_freq_softlimit = val;
+
+	val = clamp_t(int, rps->cur_freq,
+		      rps->min_freq_softlimit,
+		      rps->max_freq_softlimit);
+
+	/*
+	 * We still need *_set_rps to process the new min_delay and
+	 * update the interrupt limits and PMINTRMSK even though
+	 * frequency request may be unchanged.
+	 */
+	intel_rps_set(rps, val);
+
+unlock:
+	mutex_unlock(&rps->lock);
+
+	return ret;
+}
+
  /* External interface for intel_ips.ko */
static struct drm_i915_private __rcu *ips_mchdev;
diff --git a/drivers/gpu/drm/i915/gt/intel_rps.h b/drivers/gpu/drm/i915/gt/intel_rps.h
index 1d2cfc98b510..6a66690dfb0f 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.h
+++ b/drivers/gpu/drm/i915/gt/intel_rps.h
@@ -31,6 +31,17 @@ int intel_gpu_freq(struct intel_rps *rps, int val);
  int intel_freq_opcode(struct intel_rps *rps, int val);
  u32 intel_rps_get_cagf(struct intel_rps *rps, u32 rpstat1);
  u32 intel_rps_read_actual_frequency(struct intel_rps *rps);
+u32 intel_rps_get_requested_frequency(struct intel_rps *rps);
+u32 intel_rps_get_min_frequency(struct intel_rps *rps);
+int intel_rps_set_min_frequency(struct intel_rps *rps, u32 val);
+u32 intel_rps_get_max_frequency(struct intel_rps *rps);
+int intel_rps_set_max_frequency(struct intel_rps *rps, u32 val);
+u32 intel_rps_get_rp0_frequency(struct intel_rps *rps);
+u32 intel_rps_get_rp1_frequency(struct intel_rps *rps);
+u32 intel_rps_get_rpn_frequency(struct intel_rps *rps);
+u32 intel_rps_read_punit_req(struct intel_rps *rps);
+u32 intel_rps_get_req(struct intel_rps *rps, u32 pureq);
+u32 intel_rps_read_punit_req_frequency(struct intel_rps *rps);
void gen5_rps_irq_handler(struct intel_rps *rps);
  void gen6_rps_irq_handler(struct intel_rps *rps, u32 pm_iir);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
index 134c57ca10b7..05d8870ec6da 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
@@ -301,6 +301,11 @@ int intel_guc_slpc_set_max_freq(struct intel_guc_slpc *slpc, u32 val)
  	struct drm_i915_private *i915 = slpc_to_i915(slpc);
  	intel_wakeref_t wakeref;
+ if ((val < slpc->min_freq) ||
+	    (val > slpc->rp0_freq) ||
+	    (val < slpc->min_freq_softlimit))
+		return -EINVAL;
+
  	with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
  		ret = slpc_set_param(slpc,
  			       SLPC_PARAM_GLOBAL_MAX_GT_UNSLICE_FREQ_MHZ,
@@ -313,6 +318,8 @@ int intel_guc_slpc_set_max_freq(struct intel_guc_slpc *slpc, u32 val)
  		}
  	}
+ slpc->max_freq_softlimit = val;
+
  	return ret;
  }
@@ -359,6 +366,11 @@ int intel_guc_slpc_set_min_freq(struct intel_guc_slpc *slpc, u32 val)
  	struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
  	intel_wakeref_t wakeref;
+ if ((val < slpc->min_freq) ||
+	    (val > slpc->rp0_freq) ||
+	    (val > slpc->max_freq_softlimit))
+		return -EINVAL;
+
  	with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
  		ret = slpc_set_param(slpc,
  			       SLPC_PARAM_GLOBAL_MIN_GT_UNSLICE_FREQ_MHZ,
@@ -371,6 +383,8 @@ int intel_guc_slpc_set_min_freq(struct intel_guc_slpc *slpc, u32 val)
  		}
  	}
+ slpc->min_freq_softlimit = val;
+
  	return ret;
  }
diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index 34d37d46a126..a896bec18255 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -407,7 +407,7 @@ frequency_sample(struct intel_gt *gt, unsigned int period_ns)
if (pmu->enable & config_mask(I915_PMU_REQUESTED_FREQUENCY)) {
  		add_sample_mult(&pmu->sample[__I915_SAMPLE_FREQ_REQ],
-				intel_gpu_freq(rps, rps->cur_freq),
+				intel_rps_get_requested_frequency(rps),
  				period_ns / 1000);
  	}
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 92392c1da0e6..a5d893625736 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -9198,6 +9198,8 @@ enum {
  #define   GEN9_FREQUENCY(x)			((x) << 23)
  #define   GEN6_OFFSET(x)			((x) << 19)
  #define   GEN6_AGGRESSIVE_TURBO			(0 << 15)
+#define   GEN9_SW_REQ_UNSLICE_RATIO_SHIFT 	23
+
  #define GEN6_RC_VIDEO_FREQ			_MMIO(0xA00C)
  #define GEN6_RC_CONTROL				_MMIO(0xA090)
  #define   GEN6_RC_CTL_RC6pp_ENABLE		(1 << 16)
diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c
index 873bf996ceb5..346646a0b43b 100644
--- a/drivers/gpu/drm/i915/i915_sysfs.c
+++ b/drivers/gpu/drm/i915/i915_sysfs.c
@@ -272,7 +272,7 @@ static ssize_t gt_cur_freq_mhz_show(struct device *kdev,
  	struct drm_i915_private *i915 = kdev_minor_to_i915(kdev);
  	struct intel_rps *rps = &i915->gt.rps;
- return sysfs_emit(buf, "%d\n", intel_gpu_freq(rps, rps->cur_freq));
+	return sysfs_emit(buf, "%d\n", intel_rps_get_requested_frequency(rps));
  }
static ssize_t gt_boost_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
@@ -326,9 +326,10 @@ static ssize_t vlv_rpe_freq_mhz_show(struct device *kdev,
  static ssize_t gt_max_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
  {
  	struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
-	struct intel_rps *rps = &dev_priv->gt.rps;
+	struct intel_gt *gt = &dev_priv->gt;
+	struct intel_rps *rps = &gt->rps;
- return sysfs_emit(buf, "%d\n", intel_gpu_freq(rps, rps->max_freq_softlimit));
+	return sysfs_emit(buf, "%d\n", intel_rps_get_max_frequency(rps));
  }
static ssize_t gt_max_freq_mhz_store(struct device *kdev,
@@ -336,7 +337,8 @@ static ssize_t gt_max_freq_mhz_store(struct device *kdev,
  				     const char *buf, size_t count)
  {
  	struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
-	struct intel_rps *rps = &dev_priv->gt.rps;
+	struct intel_gt *gt = &dev_priv->gt;
+	struct intel_rps *rps = &gt->rps;
  	ssize_t ret;
  	u32 val;
@@ -344,35 +346,7 @@ static ssize_t gt_max_freq_mhz_store(struct device *kdev,
  	if (ret)
  		return ret;
- mutex_lock(&rps->lock);
-
-	val = intel_freq_opcode(rps, val);
-	if (val < rps->min_freq ||
-	    val > rps->max_freq ||
-	    val < rps->min_freq_softlimit) {
-		ret = -EINVAL;
-		goto unlock;
-	}
-
-	if (val > rps->rp0_freq)
-		DRM_DEBUG("User requested overclocking to %d\n",
-			  intel_gpu_freq(rps, val));
-
-	rps->max_freq_softlimit = val;
-
-	val = clamp_t(int, rps->cur_freq,
-		      rps->min_freq_softlimit,
-		      rps->max_freq_softlimit);
-
-	/*
-	 * We still need *_set_rps to process the new max_delay and
-	 * update the interrupt limits and PMINTRMSK even though
-	 * frequency request may be unchanged.
-	 */
-	intel_rps_set(rps, val);
-
-unlock:
-	mutex_unlock(&rps->lock);
+	ret = intel_rps_set_max_frequency(rps, val);
return ret ?: count;
  }
@@ -380,9 +354,10 @@ static ssize_t gt_max_freq_mhz_store(struct device *kdev,
  static ssize_t gt_min_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
  {
  	struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
-	struct intel_rps *rps = &dev_priv->gt.rps;
+	struct intel_gt *gt = &dev_priv->gt;
+	struct intel_rps *rps = &gt->rps;
- return sysfs_emit(buf, "%d\n", intel_gpu_freq(rps, rps->min_freq_softlimit));
+	return sysfs_emit(buf, "%d\n", intel_rps_get_min_frequency(rps));
  }
static ssize_t gt_min_freq_mhz_store(struct device *kdev,
@@ -398,31 +373,7 @@ static ssize_t gt_min_freq_mhz_store(struct device *kdev,
  	if (ret)
  		return ret;
- mutex_lock(&rps->lock);
-
-	val = intel_freq_opcode(rps, val);
-	if (val < rps->min_freq ||
-	    val > rps->max_freq ||
-	    val > rps->max_freq_softlimit) {
-		ret = -EINVAL;
-		goto unlock;
-	}
-
-	rps->min_freq_softlimit = val;
-
-	val = clamp_t(int, rps->cur_freq,
-		      rps->min_freq_softlimit,
-		      rps->max_freq_softlimit);
-
-	/*
-	 * We still need *_set_rps to process the new min_delay and
-	 * update the interrupt limits and PMINTRMSK even though
-	 * frequency request may be unchanged.
-	 */
-	intel_rps_set(rps, val);
-
-unlock:
-	mutex_unlock(&rps->lock);
+	ret = intel_rps_set_min_frequency(rps, val);
return ret ?: count;
  }
@@ -448,11 +399,11 @@ static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr
  	u32 val;
if (attr == &dev_attr_gt_RP0_freq_mhz)
-		val = intel_gpu_freq(rps, rps->rp0_freq);
+		val = intel_rps_get_rp0_frequency(rps);
  	else if (attr == &dev_attr_gt_RP1_freq_mhz)
-		val = intel_gpu_freq(rps, rps->rp1_freq);
+		val = intel_rps_get_rp1_frequency(rps);
  	else if (attr == &dev_attr_gt_RPn_freq_mhz)
-		val = intel_gpu_freq(rps, rps->min_freq);
+		val = intel_rps_get_rpn_frequency(rps);
  	else
  		BUG();

LGTM, but likely you will want someone who is more familiar with RPS to
give r-b, from my side, with typo fixed, this is:

Thanks,
Vinay.

Acked-by: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>




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