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Date:   Mon, 14 Aug 2023 16:58:17 +0200
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Subject: Re: [PATCH 1/3] drm/amdgpu: Add new api to switch on/off power
 profile mode
To:     Arvind Yadav <Arvind.Yadav@amd.com>, Christian.Koenig@amd.com,
        alexander.deucher@amd.com, Xinhui.Pan@amd.com, airlied@gmail.com,
        daniel@ffwll.ch, amd-gfx@lists.freedesktop.org,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
References: <20230814073438.10682-1-Arvind.Yadav@amd.com>
 <20230814073438.10682-2-Arvind.Yadav@amd.com>
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From:   Shashank Sharma <shashank.sharma@amd.com>
In-Reply-To: <20230814073438.10682-2-Arvind.Yadav@amd.com>
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Hey Arvind,

On 14/08/2023 09:34, Arvind Yadav wrote:
> This patch adds a function which will allow to
> change the GPU power profile based on a submitted job.
> This can optimize the power performance when the
> workload is on.
>
> Cc: Shashank Sharma <shashank.sharma@amd.com>
> Cc: Christian Koenig <christian.koenig@amd.com>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Signed-off-by: Arvind Yadav <Arvind.Yadav@amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/Makefile           |   2 +-
>   drivers/gpu/drm/amd/amdgpu/amdgpu.h           |   3 +
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c    |   2 +
>   drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c  | 156 ++++++++++++++++++
>   drivers/gpu/drm/amd/include/amdgpu_workload.h |  44 +++++
>   5 files changed, 206 insertions(+), 1 deletion(-)
>   create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c
>   create mode 100644 drivers/gpu/drm/amd/include/amdgpu_workload.h
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
> index 415a7fa395c4..6a9e187d61e1 100644
> --- a/drivers/gpu/drm/amd/amdgpu/Makefile
> +++ b/drivers/gpu/drm/amd/amdgpu/Makefile
> @@ -60,7 +60,7 @@ amdgpu-y += amdgpu_device.o amdgpu_kms.o \
>   	amdgpu_umc.o smu_v11_0_i2c.o amdgpu_fru_eeprom.o amdgpu_rap.o \
>   	amdgpu_fw_attestation.o amdgpu_securedisplay.o \
>   	amdgpu_eeprom.o amdgpu_mca.o amdgpu_psp_ta.o amdgpu_lsdma.o \
> -	amdgpu_ring_mux.o
> +	amdgpu_ring_mux.o amdgpu_workload.o
>   
>   amdgpu-$(CONFIG_PROC_FS) += amdgpu_fdinfo.o
>   
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index 02b827785e39..1939fa1af8a6 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -107,6 +107,7 @@
>   #include "amdgpu_fdinfo.h"
>   #include "amdgpu_mca.h"
>   #include "amdgpu_ras.h"
> +#include "amdgpu_workload.h"
>   
>   #define MAX_GPU_INSTANCE		16
>   
> @@ -1050,6 +1051,8 @@ struct amdgpu_device {
>   
>   	bool                            job_hang;
>   	bool                            dc_enabled;
> +
> +	struct amdgpu_smu_workload	smu_workload;
>   };
>   
>   static inline struct amdgpu_device *drm_to_adev(struct drm_device *ddev)
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 5c7d40873ee2..0ec18b8fe29f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -3672,6 +3672,8 @@ int amdgpu_device_init(struct amdgpu_device *adev,
>   
>   	INIT_WORK(&adev->xgmi_reset_work, amdgpu_device_xgmi_reset_func);
>   
> +	amdgpu_smu_workload_init(adev);
> +
>   	adev->gfx.gfx_off_req_count = 1;
>   	adev->gfx.gfx_off_residency = 0;
>   	adev->gfx.gfx_off_entrycount = 0;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c
> new file mode 100644
> index 000000000000..ce0339d75c12
> --- /dev/null
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c
> @@ -0,0 +1,156 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright 2023 Advanced Micro Devices, Inc.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
> + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> + * OTHER DEALINGS IN THE SOFTWARE.
> + *
> + */
> +
> +#include "amdgpu.h"
> +
> +/* 100 millsecond timeout */
> +#define SMU_IDLE_TIMEOUT	msecs_to_jiffies(100)
> +
> +static enum PP_SMC_POWER_PROFILE
> +ring_to_power_profile(uint32_t ring_type)
> +{
> +	switch (ring_type) {
> +	case AMDGPU_RING_TYPE_GFX:
> +		return PP_SMC_POWER_PROFILE_FULLSCREEN3D;
> +	case AMDGPU_RING_TYPE_COMPUTE:
> +		return PP_SMC_POWER_PROFILE_COMPUTE;
> +	case AMDGPU_RING_TYPE_UVD:
> +	case AMDGPU_RING_TYPE_VCE:
> +	case AMDGPU_RING_TYPE_UVD_ENC:
> +	case AMDGPU_RING_TYPE_VCN_DEC:
> +	case AMDGPU_RING_TYPE_VCN_ENC:
> +	case AMDGPU_RING_TYPE_VCN_JPEG:
> +		return PP_SMC_POWER_PROFILE_VIDEO;
> +	default:
> +		return PP_SMC_POWER_PROFILE_BOOTUP_DEFAULT;
> +	}
> +}
> +
> +static void
> +amdgpu_power_profile_set(struct amdgpu_device *adev,
> +			 enum PP_SMC_POWER_PROFILE profile)
This function expects the caller to hold the smu_workload_mutex, may be 
we should document it.
> +{
> +	int ret = amdgpu_dpm_switch_power_profile(adev, profile, true);
I think we should pass this return value to caller instead of keeping 
the function void.
> +
> +	if (ret == 0) {
> +		/* Set the bit for the submitted workload profile */
> +		adev->smu_workload.submit_workload_status |= (1 << profile);
> +		atomic_inc(&adev->smu_workload.power_profile_ref[profile]);
> +	} else {
> +		DRM_ERROR("Failed to set power profile, error %d\n", ret);
This can be a warning instead of error.
> +	}
> +
> +}
> +
> +static void
> +amdgpu_power_profile_clear(struct amdgpu_device *adev,
> +			   enum PP_SMC_POWER_PROFILE profile)
> +{
> +	int ret = amdgpu_dpm_switch_power_profile(adev, profile, false);
same for return value here as well.
> +
> +	if (ret == 0) {
> +		 /* Clear the bit for the submitted workload profile */
> +		adev->smu_workload.submit_workload_status &= ~(1 << profile);
> +	} else
> +		DRM_ERROR("Failed to clear power profile, error %d\n", ret);
> +
> +}
> +
> +static void amdgpu_smu_idle_work_handler(struct work_struct *work)
> +{
> +
> +	struct amdgpu_smu_workload *wl = container_of(work,
> +						      struct amdgpu_smu_workload,
> +						      smu_delayed_work.work);
> +	struct amdgpu_device *adev = wl->adev;
> +	bool reschedule = false;
> +
> +	mutex_lock(&adev->smu_workload.workload_lock);
> +	for (int index  = fls(adev->smu_workload.submit_workload_status);
This can be kept outside the for() for better readability and alignment.
> +	     index >= 0; index--) {
> +		if (!atomic_read(&adev->smu_workload.power_profile_ref[index]) &&
> +		    adev->smu_workload.submit_workload_status & (1 << index)) {
> +			amdgpu_power_profile_clear(adev, index);
> +		} else if (atomic_read(&adev->smu_workload.power_profile_ref[index]))
> +			reschedule = true;
> +	}
> +

This block can be re-arranged a bit for better readability, pls consider:

for () {

     atomic_t val = 
atomic_read(&adev->smu_workload.power_profile_ref[index];

     if (val) {

         reschedule = true;

         break;

     } else {

         if (adev->smu_workload.submit_workload_status & (1 << index))

             amdgpu_power_profile_clear(adev, index);

     }

}

> +	if (reschedule)
> +		schedule_delayed_work(&adev->smu_workload.smu_delayed_work,
> +				      SMU_IDLE_TIMEOUT);
pls check the return value of work
> +
> +	mutex_unlock(&adev->smu_workload.workload_lock);
> +}
> +
> +void amdgpu_put_workload_profile(struct amdgpu_device *adev,
> +				 uint32_t ring_type)
> +{
> +
> +	enum PP_SMC_POWER_PROFILE profile = ring_to_power_profile(ring_type);
> +
> +	if (profile == PP_SMC_POWER_PROFILE_BOOTUP_DEFAULT)
> +		return;
> +
> +	mutex_lock(&adev->smu_workload.workload_lock);
> +	atomic_dec(&adev->smu_workload.power_profile_ref[profile]);
> +	schedule_delayed_work(&adev->smu_workload.smu_delayed_work, SMU_IDLE_TIMEOUT);
> +	mutex_unlock(&adev->smu_workload.workload_lock);
> +}
> +
> +void amdgpu_set_workload_profile(struct amdgpu_device *adev,
> +				 uint32_t ring_type)
I would prefer if you can split this patch into two, one just to set 
profile, other to clear profile and schedule work.
> +{
> +	enum PP_SMC_POWER_PROFILE profile = ring_to_power_profile(ring_type);
> +
> +	if (profile == PP_SMC_POWER_PROFILE_BOOTUP_DEFAULT)
> +		return;
> +
> +	mutex_lock(&adev->smu_workload.workload_lock);
> +	cancel_delayed_work_sync(&adev->smu_workload.smu_delayed_work);
Please check the return value here and proceed only when we were able to 
cancel successfully.
> +
> +	amdgpu_power_profile_set(adev, profile);
> +
> +	/* Clear the already finished jobs of higher power profile*/
> +	for (int index = fls(adev->smu_workload.submit_workload_status);
> +	     index > profile; index--) {
> +		if (!atomic_read(&adev->smu_workload.power_profile_ref[index]) &&
> +		    adev->smu_workload.submit_workload_status & (1 << index)) {
> +			amdgpu_power_profile_clear(adev, index);
> +		}
> +	}
> +
> +	mutex_unlock(&adev->smu_workload.workload_lock);
> +}
> +
> +void amdgpu_smu_workload_init(struct amdgpu_device *adev)
> +{
> +	struct amdgpu_smu_workload wl;
> +
> +	wl.adev = adev;
> +	wl.submit_workload_status = 0;
> +	adev->smu_workload = wl;

Why do we need variable wl at all, which is a local variable of the 
stack ? You can just do:

adev->smu_workload.adev = adev;
adev->smu_workload.submit_workload_status = 0;

> +
> +	mutex_init(&adev->smu_workload.workload_lock);
> +	INIT_DELAYED_WORK(&adev->smu_workload.smu_delayed_work, amdgpu_smu_idle_work_handler);

Are we missing the respective amdgpu_smu_workload_fini which will 
destroy the mutex ?

- Shashank

> +}
> diff --git a/drivers/gpu/drm/amd/include/amdgpu_workload.h b/drivers/gpu/drm/amd/include/amdgpu_workload.h
> new file mode 100644
> index 000000000000..09804c3d2869
> --- /dev/null
> +++ b/drivers/gpu/drm/amd/include/amdgpu_workload.h
> @@ -0,0 +1,44 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * Copyright 2023 Advanced Micro Devices, Inc.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
> + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> + * OTHER DEALINGS IN THE SOFTWARE.
> + *
> + */
> +
> +#ifndef _AMDGPU_WORKLOAD_H_
> +#define _AMDGPU_WORKLOAD_H_
> +
> +struct amdgpu_smu_workload {
> +	struct amdgpu_device	*adev;
> +	struct mutex		workload_lock;
> +	struct delayed_work	smu_delayed_work;
> +	uint32_t		submit_workload_status;
> +	atomic_t		power_profile_ref[PP_SMC_POWER_PROFILE_COUNT];
> +};
> +
> +void amdgpu_set_workload_profile(struct amdgpu_device *adev,
> +				 uint32_t ring_type);
> +
> +void amdgpu_put_workload_profile(struct amdgpu_device *adev,
> +				 uint32_t ring_type);
> +
> +void amdgpu_smu_workload_init(struct amdgpu_device *adev);
> +
> +#endif