[Intel-gfx] [PATCH] drm/i915/guc: Disable PL1 power limit when loading GuC firmware

[Ashutosh Dixit <ashutosh.dixit@intel.com>]

On dGfx, the PL1 power limit being enabled and set to a low value results
in a low GPU operating freq. It also negates the freq raise operation which
is done before GuC firmware load. As a result GuC firmware load can time
out. Such timeouts were seen in the GL #8062 bug below (where the PL1 power
limit was enabled and set to a low value). Therefore disable the PL1 power
limit when allowed by HW when loading GuC firmware.

v2:
 - Take mutex (to disallow writes to power1_max) across GuC reset/fw load
 - Add hwm_power_max_restore to error return code path

v3 (Jani N):
 - Add/remove explanatory comments
 - Function renames
 - Type corrections
 - Locking annotation

Link: https://gitlab.freedesktop.org/drm/intel/-/issues/8062
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
---
 drivers/gpu/drm/i915/gt/uc/intel_uc.c |  9 +++++++
 drivers/gpu/drm/i915/i915_hwmon.c     | 39 +++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_hwmon.h     |  7 +++++
 3 files changed, 55 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.c b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
index 4ccb4be4c9cba..aa8e35a5636a0 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
@@ -18,6 +18,7 @@
 #include "intel_uc.h"
 
 #include "i915_drv.h"
+#include "i915_hwmon.h"
 
 static const struct intel_uc_ops uc_ops_off;
 static const struct intel_uc_ops uc_ops_on;
@@ -461,6 +462,7 @@ static int __uc_init_hw(struct intel_uc *uc)
 	struct intel_guc *guc = &uc->guc;
 	struct intel_huc *huc = &uc->huc;
 	int ret, attempts;
+	bool pl1en;
 
 	GEM_BUG_ON(!intel_uc_supports_guc(uc));
 	GEM_BUG_ON(!intel_uc_wants_guc(uc));
@@ -491,6 +493,9 @@ static int __uc_init_hw(struct intel_uc *uc)
 	else
 		attempts = 1;
 
+	/* Disable a potentially low PL1 power limit to allow freq to be raised */
+	i915_hwmon_power_max_disable(gt->i915, &pl1en);
+
 	intel_rps_raise_unslice(&uc_to_gt(uc)->rps);
 
 	while (attempts--) {
@@ -547,6 +552,8 @@ static int __uc_init_hw(struct intel_uc *uc)
 		intel_rps_lower_unslice(&uc_to_gt(uc)->rps);
 	}
 
+	i915_hwmon_power_max_restore(gt->i915, pl1en);
+
 	guc_info(guc, "submission %s\n", str_enabled_disabled(intel_uc_uses_guc_submission(uc)));
 	guc_info(guc, "SLPC %s\n", str_enabled_disabled(intel_uc_uses_guc_slpc(uc)));
 
@@ -563,6 +570,8 @@ static int __uc_init_hw(struct intel_uc *uc)
 	/* Return GT back to RPn */
 	intel_rps_lower_unslice(&uc_to_gt(uc)->rps);
 
+	i915_hwmon_power_max_restore(gt->i915, pl1en);
+
 	__uc_sanitize(uc);
 
 	if (!ret) {
diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c
index ee63a8fd88fc1..769b5bda4d53f 100644
--- a/drivers/gpu/drm/i915/i915_hwmon.c
+++ b/drivers/gpu/drm/i915/i915_hwmon.c
@@ -444,6 +444,45 @@ hwm_power_write(struct hwm_drvdata *ddat, u32 attr, int chan, long val)
 	}
 }
 
+void i915_hwmon_power_max_disable(struct drm_i915_private *i915, bool *old)
+	__acquires(i915->hwmon->hwmon_lock)
+{
+	struct i915_hwmon *hwmon = i915->hwmon;
+	intel_wakeref_t wakeref;
+	u32 r;
+
+	if (!hwmon || !i915_mmio_reg_valid(hwmon->rg.pkg_rapl_limit))
+		return;
+
+	/* Take mutex to prevent concurrent hwm_power_max_write */
+	mutex_lock(&hwmon->hwmon_lock);
+
+	with_intel_runtime_pm(hwmon->ddat.uncore->rpm, wakeref)
+		r = intel_uncore_rmw(hwmon->ddat.uncore,
+				     hwmon->rg.pkg_rapl_limit,
+				     PKG_PWR_LIM_1_EN, 0);
+
+	*old = !!(r & PKG_PWR_LIM_1_EN);
+}
+
+void i915_hwmon_power_max_restore(struct drm_i915_private *i915, bool old)
+	__releases(i915->hwmon->hwmon_lock)
+{
+	struct i915_hwmon *hwmon = i915->hwmon;
+	intel_wakeref_t wakeref;
+
+	if (!hwmon || !i915_mmio_reg_valid(hwmon->rg.pkg_rapl_limit))
+		return;
+
+	with_intel_runtime_pm(hwmon->ddat.uncore->rpm, wakeref)
+		intel_uncore_rmw(hwmon->ddat.uncore,
+				 hwmon->rg.pkg_rapl_limit,
+				 PKG_PWR_LIM_1_EN,
+				 old ? PKG_PWR_LIM_1_EN : 0);
+
+	mutex_unlock(&hwmon->hwmon_lock);
+}
+
 static umode_t
 hwm_energy_is_visible(const struct hwm_drvdata *ddat, u32 attr)
 {
diff --git a/drivers/gpu/drm/i915/i915_hwmon.h b/drivers/gpu/drm/i915/i915_hwmon.h
index 7ca9cf2c34c96..0fcb7de844061 100644
--- a/drivers/gpu/drm/i915/i915_hwmon.h
+++ b/drivers/gpu/drm/i915/i915_hwmon.h
@@ -7,14 +7,21 @@
 #ifndef __I915_HWMON_H__
 #define __I915_HWMON_H__
 
+#include <linux/types.h>
+
 struct drm_i915_private;
+struct intel_gt;
 
 #if IS_REACHABLE(CONFIG_HWMON)
 void i915_hwmon_register(struct drm_i915_private *i915);
 void i915_hwmon_unregister(struct drm_i915_private *i915);
+void i915_hwmon_power_max_disable(struct drm_i915_private *i915, bool *old);
+void i915_hwmon_power_max_restore(struct drm_i915_private *i915, bool old);
 #else
 static inline void i915_hwmon_register(struct drm_i915_private *i915) { };
 static inline void i915_hwmon_unregister(struct drm_i915_private *i915) { };
+static inline void i915_hwmon_power_max_disable(struct drm_i915_private *i915, bool *old) { };
+static inline void i915_hwmon_power_max_restore(struct drm_i915_private *i915, bool old) { };
 #endif
 
 #endif /* __I915_HWMON_H__ */
-- 
2.38.0