[PATCH 1/2] drm/i915/pmu: Use functions common with sysfs to read actual freq
Tvrtko Ursulin
tvrtko.ursulin at linux.intel.com
Wed Mar 15 09:43:30 UTC 2023
On 10/03/2023 00:59, Ashutosh Dixit wrote:
> Expose intel_rps_read_actual_frequency_fw to read the actual freq without
> taking forcewake for use by PMU. The code is refactored to use a common set
> of functions across sysfs and PMU. Using common functions with sysfs in PMU
> solves the issues of missing support for MTL and missing support for older
> generations (prior to Gen6). It also future proofs the PMU where sometimes
> code has been updated for sysfs and PMU has been missed.
>
> v2: Remove runtime_pm_if_in_use from read_actual_frequency_fw (Tvrtko)
>
> Fixes: 22009b6dad66 ("drm/i915/mtl: Modify CAGF functions for MTL")
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/8280
> Signed-off-by: Ashutosh Dixit <ashutosh.dixit at intel.com>
> ---
> drivers/gpu/drm/i915/gt/intel_rps.c | 34 ++++++++++++++++-------------
> drivers/gpu/drm/i915/gt/intel_rps.h | 2 +-
> drivers/gpu/drm/i915/i915_pmu.c | 10 ++++-----
> 3 files changed, 24 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_rps.c b/drivers/gpu/drm/i915/gt/intel_rps.c
> index 4d0dc9de23f9..9d9ac35691fc 100644
> --- a/drivers/gpu/drm/i915/gt/intel_rps.c
> +++ b/drivers/gpu/drm/i915/gt/intel_rps.c
> @@ -2046,16 +2046,6 @@ void intel_rps_sanitize(struct intel_rps *rps)
> rps_disable_interrupts(rps);
> }
>
> -u32 intel_rps_read_rpstat_fw(struct intel_rps *rps)
> -{
> - struct drm_i915_private *i915 = rps_to_i915(rps);
> - i915_reg_t rpstat;
> -
> - rpstat = (GRAPHICS_VER(i915) >= 12) ? GEN12_RPSTAT1 : GEN6_RPSTAT1;
> -
> - return intel_uncore_read_fw(rps_to_gt(rps)->uncore, rpstat);
> -}
> -
> u32 intel_rps_read_rpstat(struct intel_rps *rps)
> {
> struct drm_i915_private *i915 = rps_to_i915(rps);
> @@ -2089,10 +2079,11 @@ u32 intel_rps_get_cagf(struct intel_rps *rps, u32 rpstat)
> return cagf;
> }
>
> -static u32 read_cagf(struct intel_rps *rps)
> +static u32 __read_cagf(struct intel_rps *rps, bool take_fw)
> {
> struct drm_i915_private *i915 = rps_to_i915(rps);
> struct intel_uncore *uncore = rps_to_uncore(rps);
> + i915_reg_t r = INVALID_MMIO_REG;
> u32 freq;
>
> /*
> @@ -2100,22 +2091,30 @@ static u32 read_cagf(struct intel_rps *rps)
> * registers will return 0 freq when GT is in RC6
> */
> if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 70)) {
> - freq = intel_uncore_read(uncore, MTL_MIRROR_TARGET_WP1);
> + r = MTL_MIRROR_TARGET_WP1;
> } else if (GRAPHICS_VER(i915) >= 12) {
> - freq = intel_uncore_read(uncore, GEN12_RPSTAT1);
> + r = GEN12_RPSTAT1;
> } else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
> vlv_punit_get(i915);
> freq = vlv_punit_read(i915, PUNIT_REG_GPU_FREQ_STS);
> vlv_punit_put(i915);
> + goto exit;
Alternatively you could avoid the goto by making the read below
conditional on r being set. One more conditional though for avoiding
gotos.. up to you.
> } else if (GRAPHICS_VER(i915) >= 6) {
> - freq = intel_uncore_read(uncore, GEN6_RPSTAT1);
> + r = GEN6_RPSTAT1;
> } else {
> - freq = intel_uncore_read(uncore, MEMSTAT_ILK);
> + r = MEMSTAT_ILK;
> }
>
> + freq = take_fw ? intel_uncore_read(uncore, r) : intel_uncore_read_fw(uncore, r);
> +exit:
> return intel_rps_get_cagf(rps, freq);
> }
>
> +static u32 read_cagf(struct intel_rps *rps)
> +{
> + return __read_cagf(rps, true);
> +}
There is only one caller so up to you if you think a helper is needed or
not.
> +
> u32 intel_rps_read_actual_frequency(struct intel_rps *rps)
> {
> struct intel_runtime_pm *rpm = rps_to_uncore(rps)->rpm;
> @@ -2128,6 +2127,11 @@ u32 intel_rps_read_actual_frequency(struct intel_rps *rps)
> return freq;
> }
>
> +u32 intel_rps_read_actual_frequency_fw(struct intel_rps *rps)
> +{
> + return intel_gpu_freq(rps, __read_cagf(rps, false));
> +}
> +
> u32 intel_rps_read_punit_req(struct intel_rps *rps)
> {
> struct intel_uncore *uncore = rps_to_uncore(rps);
> diff --git a/drivers/gpu/drm/i915/gt/intel_rps.h b/drivers/gpu/drm/i915/gt/intel_rps.h
> index c622962c6bef..2d5b3ef58606 100644
> --- a/drivers/gpu/drm/i915/gt/intel_rps.h
> +++ b/drivers/gpu/drm/i915/gt/intel_rps.h
> @@ -39,6 +39,7 @@ 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_read_actual_frequency_fw(struct intel_rps *rps);
> u32 intel_rps_get_requested_frequency(struct intel_rps *rps);
> u32 intel_rps_get_min_frequency(struct intel_rps *rps);
> u32 intel_rps_get_min_raw_freq(struct intel_rps *rps);
> @@ -52,7 +53,6 @@ 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);
> u32 intel_rps_read_rpstat(struct intel_rps *rps);
> -u32 intel_rps_read_rpstat_fw(struct intel_rps *rps);
> void gen6_rps_get_freq_caps(struct intel_rps *rps, struct intel_rps_freq_caps *caps);
> void intel_rps_raise_unslice(struct intel_rps *rps);
> void intel_rps_lower_unslice(struct intel_rps *rps);
> diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
> index a76c5ce9513d..7ece883a7d95 100644
> --- a/drivers/gpu/drm/i915/i915_pmu.c
> +++ b/drivers/gpu/drm/i915/i915_pmu.c
> @@ -392,14 +392,12 @@ frequency_sample(struct intel_gt *gt, unsigned int period_ns)
> * case we assume the system is running at the intended
> * frequency. Fortunately, the read should rarely fail!
> */
> - val = intel_rps_read_rpstat_fw(rps);
> - if (val)
> - val = intel_rps_get_cagf(rps, val);
I think you can un-export this one now.
With that looks okay to me, with or without the other stuff:
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Regards,
Tvrtko
> - else
> - val = rps->cur_freq;
> + val = intel_rps_read_actual_frequency_fw(rps);
> + if (!val)
> + val = intel_gpu_freq(rps, rps->cur_freq);
>
> add_sample_mult(&pmu->sample[__I915_SAMPLE_FREQ_ACT],
> - intel_gpu_freq(rps, val), period_ns / 1000);
> + val, period_ns / 1000);
> }
>
> if (pmu->enable & config_mask(I915_PMU_REQUESTED_FREQUENCY)) {
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