drm/i915/guc/slpc: Sysfs hooks for SLPC

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.

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)

v4: Add helper for host part of intel_rps_set_freq helpers (Michal W)

v5: checkpatch()

Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Acked-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Sujaritha Sundaresan <sujaritha.sundaresan@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210730202119.23810-13-vinay.belgaumkar@intel.com

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);
@@ -1963,6 +1970,176 @@ 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);
+}
+
+static u32 intel_rps_get_req(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(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);
+}
+
+static int set_max_freq(struct intel_rps *rps, u32 val)
+{
+	struct drm_i915_private *i915 = rps_to_i915(rps);
+	int ret = 0;
+
+	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;
+}
+
+int intel_rps_set_max_frequency(struct intel_rps *rps, u32 val)
+{
+	struct intel_guc_slpc *slpc = rps_to_slpc(rps);
+
+	if (rps_uses_slpc(rps))
+		return intel_guc_slpc_set_max_freq(slpc, val);
+	else
+		return set_max_freq(rps, val);
+}
+
+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);
+}
+
+static int set_min_freq(struct intel_rps *rps, u32 val)
+{
+	int ret = 0;
+
+	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;
+}
+
+int intel_rps_set_min_frequency(struct intel_rps *rps, u32 val)
+{
+	struct intel_guc_slpc *slpc = rps_to_slpc(rps);
+
+	if (rps_uses_slpc(rps))
+		return intel_guc_slpc_set_min_freq(slpc, val);
+	else
+		return set_min_freq(rps, val);
+}
+
 /* External interface for intel_ips.ko */
 
 static struct drm_i915_private __rcu *ips_mchdev;

drivers/gpu/drm/i915/gt/intel_rps.h

@@ -31,6 +31,16 @@ 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_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);

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);
 	}
 

drivers/gpu/drm/i915/i915_reg.h

@@ -9229,6 +9229,8 @@ 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)

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;
 
@@ -344,53 +346,26 @@ 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;
 }
 
 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 drm_i915_private *i915 = kdev_minor_to_i915(kdev);
+	struct intel_gt *gt = &i915->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,
 				     struct device_attribute *attr,
 				     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 drm_i915_private *i915 = kdev_minor_to_i915(kdev);
+	struct intel_rps *rps = &i915->gt.rps;
 	ssize_t ret;
 	u32 val;
 
@@ -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();