Re: [PATCH v6 2/3] drm/i915/hwmon: Add hwmon support in libpower for dgfx

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On 12/7/2022 10:56 AM, Dixit, Ashutosh wrote:
On Tue, 06 Dec 2022 21:17:46 -0800, Riana Tauro wrote:

diff --git a/drivers/gpu/drm/i915/selftests/libpower.c b/drivers/gpu/drm/i915/selftests/libpower.c
index c66e993c5f85..3d4d2dc74a54 100644
--- a/drivers/gpu/drm/i915/selftests/libpower.c
+++ b/drivers/gpu/drm/i915/selftests/libpower.c
@@ -6,29 +6,28 @@
  #include <asm/msr.h>

  #include "i915_drv.h"
+#include "i915_hwmon.h"
  #include "libpower.h"

-bool libpower_supported(const struct drm_i915_private *i915)
-{
-	/* Discrete cards require hwmon integration */
-	if (IS_DGFX(i915))
-		return false;
-
-	return libpower_get_energy_uJ();
-}
-
-u64 libpower_get_energy_uJ(void)
+u64 libpower_get_energy_uJ(struct intel_gt *gt)

Hi Riana,

Sorry, we can't do this otherwise the build breaks at this commit which we
can't do. Note that the callers of libpower_get_energy_uJ are still using
the version without any args (see Patch 3). That is why I had R-b'd patch 3
so that we don't have to do this. It's not really needed.

If you really want to do this we'll need to port the version without the gt
arg to Patch 2 and then convert everything to the version with gt arg in
Patch 3.

I really don't think it is worth it. Maybe just go back to the previous
version of the series and modify Patch 2 and we'll be done.

Thanks.
--
Ashutosh

Hi Ashutosh

Sorry, didn't check the build after that patch. I'll revert back to previous version

Thanks
Riana


  {
	unsigned long long power;
	u32 units;
+	long energy_uJ = 0;

-	if (rdmsrl_safe(MSR_RAPL_POWER_UNIT, &power))
-		return 0;
+	if (IS_DGFX(gt->i915)) {
+		if (i915_hwmon_get_energy(gt, &energy_uJ))
+			return 0;
+	} else {
+		if (rdmsrl_safe(MSR_RAPL_POWER_UNIT, &power))
+			return 0;

-	units = (power & 0x1f00) >> 8;
+		units = (power & 0x1f00) >> 8;

-	if (rdmsrl_safe(MSR_PP1_ENERGY_STATUS, &power))
-		return 0;
+		if (rdmsrl_safe(MSR_PP1_ENERGY_STATUS, &power))
+			return 0;

-	return (1000000 * power) >> units; /* convert to uJ */
+		energy_uJ = (1000000 * power) >> units; /* convert to uJ */
+	}
+	return energy_uJ;
  }
diff --git a/drivers/gpu/drm/i915/selftests/libpower.h b/drivers/gpu/drm/i915/selftests/libpower.h
index 5352981eb946..e4410a886654 100644
--- a/drivers/gpu/drm/i915/selftests/libpower.h
+++ b/drivers/gpu/drm/i915/selftests/libpower.h
@@ -8,10 +8,12 @@

  #include <linux/types.h>

-struct drm_i915_private;
+struct intel_gt;

-bool libpower_supported(const struct drm_i915_private *i915);
-
-u64 libpower_get_energy_uJ(void);
+u64 libpower_get_energy_uJ(struct intel_gt *gt);

+static inline bool libpower_supported(struct intel_gt *gt)
+{
+	return libpower_get_energy_uJ(gt);
+}
  #endif /* SELFTEST_LIBPOWER_H */
--
2.25.1




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