On Mon, Dec 16, 2024 at 04:57:04PM -0800, Vinay Belgaumkar wrote:
> Default SLPC power profile is Base(0). Power Saving mode(1)
> has conservative up/down thresholds and is suitable for use with
> apps that typically need to be power efficient.
>
> Cc: Sushma Venkatesh Reddy <sushma.venkatesh.re...@intel.com>
> Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
> Signed-off-by: Vinay Belgaumkar <vinay.belgaum...@intel.com>
> ---
> drivers/gpu/drm/i915/gt/intel_gt_sysfs_pm.c | 35 +++++++++++++++++++
> .../drm/i915/gt/uc/abi/guc_actions_slpc_abi.h | 5 +++
> drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c | 33 +++++++++++++++++
> drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h | 1 +
> .../gpu/drm/i915/gt/uc/intel_guc_slpc_types.h | 2 ++
> 5 files changed, 76 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_sysfs_pm.c
> b/drivers/gpu/drm/i915/gt/intel_gt_sysfs_pm.c
> index d7784650e4d9..52a5ff94a0e3 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_sysfs_pm.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_sysfs_pm.c
> @@ -464,6 +464,33 @@ static ssize_t slpc_ignore_eff_freq_store(struct kobject
> *kobj,
> return err ?: count;
> }
>
> +static ssize_t slpc_power_profile_show(struct kobject *kobj,
> + struct kobj_attribute *attr,
> + char *buff)
> +{
> + struct intel_gt *gt = intel_gt_sysfs_get_drvdata(kobj, attr->attr.name);
> + struct intel_guc_slpc *slpc = >->uc.guc.slpc;
> +
> + return sysfs_emit(buff, "%u\n", slpc->power_profile);
what if we do something like this:
cat /sys/class/drm/card1/gt/gt0/slpc_power_profile
[balanced] power_savings
echo power_savings > /sys/class/drm/card1/gt/gt0/slpc_power_profile
cat /sys/class/drm/card1/gt/gt0/slpc_power_profile
balanced [power_savings]
And second question, shouldn't we disable waitboost so this won't
compete?
Also I believe we should provide some kernel documentation documenting
what would be the governor levels like and recommended settings for
each level.
And then in Xe we should probably add a governor selection in the same
style as devfreq, but with our configs...
Thoughts?
But the code looks good and I believe many cases out there could benefit
of some extra Watts saved by having this option available...
> +}
> +
> +static ssize_t slpc_power_profile_store(struct kobject *kobj,
> + struct kobj_attribute *attr,
> + const char *buff, size_t count)
> +{
> + struct intel_gt *gt = intel_gt_sysfs_get_drvdata(kobj, attr->attr.name);
> + struct intel_guc_slpc *slpc = >->uc.guc.slpc;
> + int err;
> + u32 val;
> +
> + err = kstrtou32(buff, 0, &val);
> + if (err)
> + return err;
> +
> + err = intel_guc_slpc_set_power_profile(slpc, val);
> + return err ?: count;
> +}
> +
> struct intel_gt_bool_throttle_attr {
> struct attribute attr;
> ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr,
> @@ -668,6 +695,7 @@ INTEL_GT_ATTR_RO(media_RP0_freq_mhz);
> INTEL_GT_ATTR_RO(media_RPn_freq_mhz);
>
> INTEL_GT_ATTR_RW(slpc_ignore_eff_freq);
> +INTEL_GT_ATTR_RW(slpc_power_profile);
>
> static const struct attribute *media_perf_power_attrs[] = {
> &attr_media_freq_factor.attr,
> @@ -864,6 +892,13 @@ void intel_gt_sysfs_pm_init(struct intel_gt *gt, struct
> kobject *kobj)
> gt_warn(gt, "failed to create ignore_eff_freq sysfs
> (%pe)", ERR_PTR(ret));
> }
>
> + if (intel_uc_uses_guc_slpc(>->uc)) {
> + ret = sysfs_create_file(kobj, &attr_slpc_power_profile.attr);
> + if (ret)
> + gt_warn(gt, "failed to create slpc_power_profile sysfs
> (%pe)",
> + ERR_PTR(ret));
> + }
> +
> if (i915_mmio_reg_valid(intel_gt_perf_limit_reasons_reg(gt))) {
> ret = sysfs_create_files(kobj, throttle_reason_attrs);
> if (ret)
> diff --git a/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_slpc_abi.h
> b/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_slpc_abi.h
> index c34674e797c6..6de87ae5669e 100644
> --- a/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_slpc_abi.h
> +++ b/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_slpc_abi.h
> @@ -228,6 +228,11 @@ struct slpc_optimized_strategies {
>
> #define SLPC_OPTIMIZED_STRATEGY_COMPUTE REG_BIT(0)
>
> +enum slpc_power_profiles {
> + SLPC_POWER_PROFILES_BASE = 0x0,
> + SLPC_POWER_PROFILES_POWER_SAVING = 0x1
> +};
> +
> /**
> * DOC: SLPC H2G MESSAGE FORMAT
> *
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
> b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
> index 706fffca698b..0ee88ee347ae 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
> @@ -265,6 +265,8 @@ int intel_guc_slpc_init(struct intel_guc_slpc *slpc)
> slpc->num_boosts = 0;
> slpc->media_ratio_mode = SLPC_MEDIA_RATIO_MODE_DYNAMIC_CONTROL;
>
> + slpc->power_profile = SLPC_POWER_PROFILES_BASE;
> +
> mutex_init(&slpc->lock);
> INIT_WORK(&slpc->boost_work, slpc_boost_work);
>
> @@ -567,6 +569,34 @@ int intel_guc_slpc_set_media_ratio_mode(struct
> intel_guc_slpc *slpc, u32 val)
> return ret;
> }
>
> +int intel_guc_slpc_set_power_profile(struct intel_guc_slpc *slpc, u32 val)
> +{
> + struct drm_i915_private *i915 = slpc_to_i915(slpc);
> + intel_wakeref_t wakeref;
> + int ret = 0;
> +
> + if (val > SLPC_POWER_PROFILES_POWER_SAVING)
> + return -EINVAL;
> +
> + mutex_lock(&slpc->lock);
> + wakeref = intel_runtime_pm_get(&i915->runtime_pm);
> +
> + ret = slpc_set_param(slpc,
> + SLPC_PARAM_POWER_PROFILE,
> + val);
> + if (ret)
> + guc_err(slpc_to_guc(slpc),
> + "Failed to set power profile to %d: %pe\n",
> + val, ERR_PTR(ret));
> + else
> + slpc->power_profile = val;
> +
> + intel_runtime_pm_put(&i915->runtime_pm, wakeref);
> + mutex_unlock(&slpc->lock);
> +
> + return ret;
> +}
> +
> void intel_guc_pm_intrmsk_enable(struct intel_gt *gt)
> {
> u32 pm_intrmsk_mbz = 0;
> @@ -728,6 +758,9 @@ int intel_guc_slpc_enable(struct intel_guc_slpc *slpc)
> /* Enable SLPC Optimized Strategy for compute */
> intel_guc_slpc_set_strategy(slpc, SLPC_OPTIMIZED_STRATEGY_COMPUTE);
>
> + /* Set cached value of power_profile */
> + intel_guc_slpc_set_power_profile(slpc, slpc->power_profile);
> +
> return 0;
> }
>
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h
> b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h
> index 1cb5fd44f05c..fc9f761b4372 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h
> @@ -46,5 +46,6 @@ void intel_guc_slpc_boost(struct intel_guc_slpc *slpc);
> void intel_guc_slpc_dec_waiters(struct intel_guc_slpc *slpc);
> int intel_guc_slpc_set_ignore_eff_freq(struct intel_guc_slpc *slpc, bool
> val);
> int intel_guc_slpc_set_strategy(struct intel_guc_slpc *slpc, u32 val);
> +int intel_guc_slpc_set_power_profile(struct intel_guc_slpc *slpc, u32 val);
>
> #endif
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
> b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
> index a88651331497..2351a1693aa1 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
> @@ -33,6 +33,8 @@ struct intel_guc_slpc {
> u32 max_freq_softlimit;
> bool ignore_eff_freq;
>
> + u32 power_profile;
> +
> /* cached media ratio mode */
> u32 media_ratio_mode;
>
> --
> 2.38.1
>
