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Suggested-by: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Juergen Gross <jgross@suse.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Xin Li <xin@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org>
34 lines
607 B
C
34 lines
607 B
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2020 Intel Corporation
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*/
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#include <asm/msr.h>
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#include "i915_drv.h"
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#include "librapl.h"
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bool librapl_supported(const struct drm_i915_private *i915)
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{
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/* Discrete cards require hwmon integration */
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if (IS_DGFX(i915))
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return false;
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return librapl_energy_uJ();
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}
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u64 librapl_energy_uJ(void)
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{
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unsigned long long power;
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u32 units;
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if (rdmsrq_safe(MSR_RAPL_POWER_UNIT, &power))
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return 0;
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units = (power & 0x1f00) >> 8;
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if (rdmsrq_safe(MSR_PP1_ENERGY_STATUS, &power))
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return 0;
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return (1000000 * power) >> units; /* convert to uJ */
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}
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