Re: [RFC v4 10/11] drm/amdgpu: Rework amdgpu_device_lock_adev

["Christian König" <ckoenig.leichtzumerken@gmail.com>]

Am 09.02.22 um 01:23 schrieb Andrey Grodzovsky:
> This functions needs to be split into 2 parts where
> one is called only once for locking single instance of
> reset_domain's sem and reset flag and the other part
> which handles MP1 states should still be called for
> each device in XGMI hive.
>
> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 48 ++++++++++++++++------
>   1 file changed, 35 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index e05d7cbefd2c..aaecf0797484 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -4825,16 +4825,20 @@ int amdgpu_do_asic_reset(struct list_head *device_list_handle,
>   	return r;
>   }
>   
> -static void amdgpu_device_lock_adev(struct amdgpu_device *adev,
> -				struct amdgpu_hive_info *hive)
> +static void amdgpu_device_lock_reset_domain(struct amdgpu_reset_domain *reset_domain,
> +					    struct amdgpu_hive_info *hive)
>   {
> -	atomic_set(&adev->reset_domain->in_gpu_reset, 1);
> +	atomic_set(&reset_domain->in_gpu_reset, 1);
>   
>   	if (hive) {
> -		down_write_nest_lock(&adev->reset_domain->sem, &hive->hive_lock);
> +		down_write_nest_lock(&reset_domain->sem, &hive->hive_lock);
>   	} else {
> -		down_write(&adev->reset_domain->sem);
> +		down_write(&reset_domain->sem);
>   	}
> +}
> +
> +static void amdgpu_device_set_mp1_state(struct amdgpu_device *adev)
> +{
>   
>   	switch (amdgpu_asic_reset_method(adev)) {
>   	case AMD_RESET_METHOD_MODE1:
> @@ -4849,14 +4853,19 @@ static void amdgpu_device_lock_adev(struct amdgpu_device *adev,
>   	}
>   }
>   
> -static void amdgpu_device_unlock_adev(struct amdgpu_device *adev)
> +static void amdgpu_device_unset_mp1_state(struct amdgpu_device *adev)
>   {
>   	amdgpu_vf_error_trans_all(adev);
>   	adev->mp1_state = PP_MP1_STATE_NONE;
> -	atomic_set(&adev->reset_domain->in_gpu_reset, 0);
> -	up_write(&adev->reset_domain->sem);
>   }
>   
> +static void amdgpu_device_unlock_reset_domain(struct amdgpu_reset_domain *reset_domain)
> +{
> +	atomic_set(&reset_domain->in_gpu_reset, 0);
> +	up_write(&reset_domain->sem);
> +}

I would move this into amdgpu_reset.c and call it 
amdgpu_reset_domain_unlock().

Same of course for amdgpu_reset_domain_lock()...

Apart from that looks good to me,
Christian.

> +
> +
>   static void amdgpu_device_resume_display_audio(struct amdgpu_device *adev)
>   {
>   	struct pci_dev *p = NULL;
> @@ -5060,10 +5069,15 @@ int amdgpu_device_gpu_recover_imp(struct amdgpu_device *adev,
>   		device_list_handle = &device_list;
>   	}
>   
> +	/* We need to lock reset domain only once both for XGMI and single device */
> +	tmp_adev = list_first_entry(device_list_handle, struct amdgpu_device,
> +				    reset_list);
> +	amdgpu_device_lock_reset_domain(tmp_adev->reset_domain, hive);
> +
>   	/* block all schedulers and reset given job's ring */
>   	list_for_each_entry(tmp_adev, device_list_handle, reset_list) {
>   
> -		amdgpu_device_lock_adev(tmp_adev, hive);
> +		amdgpu_device_set_mp1_state(tmp_adev);
>   
>   		/*
>   		 * Try to put the audio codec into suspend state
> @@ -5213,9 +5227,14 @@ int amdgpu_device_gpu_recover_imp(struct amdgpu_device *adev,
>   
>   		if (audio_suspended)
>   			amdgpu_device_resume_display_audio(tmp_adev);
> -		amdgpu_device_unlock_adev(tmp_adev);
> +
> +		amdgpu_device_unset_mp1_state(tmp_adev);
>   	}
>   
> +	tmp_adev = list_first_entry(device_list_handle, struct amdgpu_device,
> +					    reset_list);
> +	amdgpu_device_unlock_reset_domain(tmp_adev->reset_domain);
> +
>   	if (hive) {
>   		mutex_unlock(&hive->hive_lock);
>   		amdgpu_put_xgmi_hive(hive);
> @@ -5477,7 +5496,8 @@ pci_ers_result_t amdgpu_pci_error_detected(struct pci_dev *pdev, pci_channel_sta
>   		 * Locking adev->reset_domain->sem will prevent any external access
>   		 * to GPU during PCI error recovery
>   		 */
> -		amdgpu_device_lock_adev(adev, NULL);
> +		amdgpu_device_lock_reset_domain(adev->reset_domain, NULL);
> +		amdgpu_device_set_mp1_state(adev);
>   
>   		/*
>   		 * Block any work scheduling as we do for regular GPU reset
> @@ -5584,7 +5604,8 @@ pci_ers_result_t amdgpu_pci_slot_reset(struct pci_dev *pdev)
>   		DRM_INFO("PCIe error recovery succeeded\n");
>   	} else {
>   		DRM_ERROR("PCIe error recovery failed, err:%d", r);
> -		amdgpu_device_unlock_adev(adev);
> +		amdgpu_device_unset_mp1_state(adev);
> +		amdgpu_device_unlock_reset_domain(adev->reset_domain);
>   	}
>   
>   	return r ? PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_RECOVERED;
> @@ -5621,7 +5642,8 @@ void amdgpu_pci_resume(struct pci_dev *pdev)
>   		drm_sched_start(&ring->sched, true);
>   	}
>   
> -	amdgpu_device_unlock_adev(adev);
> +	amdgpu_device_unset_mp1_state(adev);
> +	amdgpu_device_unlock_reset_domain(adev->reset_domain);
>   }
>   
>   bool amdgpu_device_cache_pci_state(struct pci_dev *pdev)