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Message-ID: <0b42f0ed-d737-cda6-f78c-25b876560028@amd.com>
Date: Mon, 21 Aug 2023 20:10:46 +0530
From: "Yadav, Arvind" <arvyadav@....com>
To: Shashank Sharma <shashank.sharma@....com>,
Arvind Yadav <Arvind.Yadav@....com>, Christian.Koenig@....com,
alexander.deucher@....com, Xinhui.Pan@....com, airlied@...il.com,
daniel@...ll.ch, Felix.Kuehling@....com,
amd-gfx@...ts.freedesktop.org
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/7] drm/amdgpu: Add new function to put GPU power
profile
On 8/21/2023 7:09 PM, Shashank Sharma wrote:
>
> On 21/08/2023 08:47, Arvind Yadav wrote:
>> This patch adds a function which will clear the GPU
>> power profile after job finished.
>>
>> This is how it works:
>> - schedular will set the GPU power profile based on ring_type.
>> - Schedular will clear the GPU Power profile once job finished.
>> - Here, the *_workload_profile_set function will set the GPU
>> power profile and the *_workload_profile_put function will
>> schedule the smu_delayed_work task after 100ms delay. This
>> smu_delayed_work task will clear a GPU power profile if any
>> new jobs are not scheduled within 100 ms. But if any new job
>> comes within 100ms then the *_workload_profile_set function
>> will cancel this work and set the GPU power profile based on
>> preferences.
>>
>> v2:
>> - Splitting workload_profile_set and workload_profile_put
>> into two separate patches.
>> - Addressed review comment.
>>
>> Cc: Shashank Sharma <shashank.sharma@....com>
>> Cc: Christian Koenig <christian.koenig@....com>
>> Cc: Alex Deucher <alexander.deucher@....com>
>> Signed-off-by: Arvind Yadav <Arvind.Yadav@....com>
>> ---
>> drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c | 97 +++++++++++++++++++
>> drivers/gpu/drm/amd/include/amdgpu_workload.h | 3 +
>> 2 files changed, 100 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c
>> index e661cc5b3d92..6367eb88a44d 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c
>> @@ -24,6 +24,9 @@
>> #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)
>> {
>> @@ -59,6 +62,80 @@ amdgpu_power_profile_set(struct amdgpu_device *adev,
>> return ret;
>> }
>> +static int
>> +amdgpu_power_profile_clear(struct amdgpu_device *adev,
>> + enum PP_SMC_POWER_PROFILE profile)
>> +{
>> + int ret = amdgpu_dpm_switch_power_profile(adev, profile, false);
>> +
>> + if (!ret) {
>> + /* Clear the bit for the submitted workload profile */
>> + adev->smu_workload.submit_workload_status &= ~(1 << profile);
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +static void
>> +amdgpu_power_profile_idle_work_handler(struct work_struct *work)
>> +{
>> +
>> + struct amdgpu_smu_workload *workload = container_of(work,
>> + struct amdgpu_smu_workload,
>> + smu_delayed_work.work);
>> + struct amdgpu_device *adev = workload->adev;
>> + bool reschedule = false;
>> + int index = fls(workload->submit_workload_status);
>> + int ret;
>> +
> We should check validity and range of index here before before using
> it below.
Noted.
>
>> + mutex_lock(&workload->workload_lock);
>> + for (; index > 0; index--) {
>> + int val = atomic_read(&workload->power_profile_ref[index]);
>> +
>> + if (val) {
>> + reschedule = true;
>> + } else {
>> + if (workload->submit_workload_status &
>> + (1 << index)) {
>> + ret = amdgpu_power_profile_clear(adev, index);
>> + if (ret) {
>> + DRM_WARN("Failed to clear workload %s,error =
>> %d\n",
>> + amdgpu_workload_mode_name[index], ret);
>> + goto exit;
> instead of exiting, we might wanna continue the loop here, just to
> check if we are able to reset another profile in the next attempt.
Noted.
>> + }
>> + }
>> + }
>> + }
> A blank line recommended here.
Noted.
>> + if (reschedule)
>> + schedule_delayed_work(&workload->smu_delayed_work,
>> + SMU_IDLE_TIMEOUT);
>> +exit:
>> + mutex_unlock(&workload->workload_lock);
>> +}
>> +
>> +void amdgpu_workload_profile_put(struct amdgpu_device *adev,
>> + uint32_t ring_type)
>> +{
>> + struct amdgpu_smu_workload *workload = &adev->smu_workload;
>> + enum PP_SMC_POWER_PROFILE profile =
>> ring_to_power_profile(ring_type);
>> +
>> + if (profile == PP_SMC_POWER_PROFILE_BOOTUP_DEFAULT)
>> + return;
>> +
>> + mutex_lock(&workload->workload_lock);
>> +
>> + if (!atomic_read(&workload->power_profile_ref[profile])) {
>> + DRM_WARN("Power profile %s ref. count error\n",
>> + amdgpu_workload_mode_name[profile]);
>> + } else {
>> + atomic_dec(&workload->power_profile_ref[profile]);
>> + schedule_delayed_work(&workload->smu_delayed_work,
>> + SMU_IDLE_TIMEOUT);
> We don't want to schedule this work everytime a power profile is put,
> but we want to do that only when a power profile ref count reaches
> '0'. So you might want to check the ref_count, and schedule the work
> under a if (!ref_count) condition.
Noted.
>
>> + }
>> +
>> + mutex_unlock(&workload->workload_lock);
>> +}
>> +
>> void amdgpu_workload_profile_set(struct amdgpu_device *adev,
>> uint32_t ring_type)
>> {
>> @@ -70,13 +147,30 @@ void amdgpu_workload_profile_set(struct
>> amdgpu_device *adev,
>> return;
>> mutex_lock(&workload->workload_lock);
>> + cancel_delayed_work_sync(&workload->smu_delayed_work);
>> ret = amdgpu_power_profile_set(adev, profile);
>> if (ret) {
>> DRM_WARN("Failed to set workload profile to %s, error = %d\n",
>> amdgpu_workload_mode_name[profile], ret);
>> + goto exit;
>> + }
>> +
>> + /* Clear the already finished jobs of higher power profile*/
>
> We are not clearing the jobs here, but their power profiles.
>
> I would recommend a little rework in the comment like "As we cancelled
> the delayed work, check and clear the pending higher power profiles
> set by previous jobs which are done now"
>
Noted.
>> + for (int index = fls(workload->submit_workload_status);
> The index can be initialized above, like the put function for loop.
>> + index > profile; index--) {
>> + if (!atomic_read(&workload->power_profile_ref[index]) &&
>> + workload->submit_workload_status & (1 << index)) {
>> + ret = amdgpu_power_profile_clear(adev, index);
> After clearing the power profile, we should also clear the respective
> workload->submit_workload_status bit as well, right ?
We are clearing in submit_workload_status bit in
amdgpu_power_profile_clear()
>> + if (ret) {
>> + DRM_WARN("Failed to clear workload %s, err = %d\n",
>> + amdgpu_workload_mode_name[profile], ret);
>> + goto exit;
>
> Same as previous about continuing the loop.
Noted.
Thank You,
~Arvind
>
> - Shashank
>
>> + }
>> + }
>> }
>> +exit:
>> mutex_unlock(&workload->workload_lock);
>> }
>> @@ -87,6 +181,8 @@ void amdgpu_workload_profile_init(struct
>> amdgpu_device *adev)
>> adev->smu_workload.initialized = true;
>> mutex_init(&adev->smu_workload.workload_lock);
>> + INIT_DELAYED_WORK(&adev->smu_workload.smu_delayed_work,
>> + amdgpu_power_profile_idle_work_handler);
>> }
>> void amdgpu_workload_profile_fini(struct amdgpu_device *adev)
>> @@ -94,6 +190,7 @@ void amdgpu_workload_profile_fini(struct
>> amdgpu_device *adev)
>> if (!adev->smu_workload.initialized)
>> return;
>> + cancel_delayed_work_sync(&adev->smu_workload.smu_delayed_work);
>> adev->smu_workload.submit_workload_status = 0;
>> adev->smu_workload.initialized = false;
>> mutex_destroy(&adev->smu_workload.workload_lock);
>> diff --git a/drivers/gpu/drm/amd/include/amdgpu_workload.h
>> b/drivers/gpu/drm/amd/include/amdgpu_workload.h
>> index 5022f28fc2f9..ee1f87257f2d 100644
>> --- a/drivers/gpu/drm/amd/include/amdgpu_workload.h
>> +++ b/drivers/gpu/drm/amd/include/amdgpu_workload.h
>> @@ -46,6 +46,9 @@ static const char * const
>> amdgpu_workload_mode_name[] = {
>> "Window3D"
>> };
>> +void amdgpu_workload_profile_put(struct amdgpu_device *adev,
>> + uint32_t ring_type);
>> +
>> void amdgpu_workload_profile_set(struct amdgpu_device *adev,
>> uint32_t ring_type);
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