Re: [PATCH] drm/amdgpu: Unmap all MMIO mappings

[Andrey Grodzovsky <andrey.grodzovsky@amd.com>]

Ping

Andrey

On 2021-05-17 3:31 p.m., Andrey Grodzovsky wrote:
> Access to those must be prevented post pci_remove
> 
> v6: Drop BOs list, unampping VRAM BAR is enough.
> v8:
> Add condition of xgmi.connected_to_cpu to MTTR
> handling and remove MTTR handling from the old place.
> 
> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 26 +++++++++++++++++++---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_object.c |  4 ----
>   drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c    |  4 ----
>   3 files changed, 23 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index f7cca25c0fa0..8b50315d1fe1 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -3666,6 +3666,27 @@ int amdgpu_device_init(struct amdgpu_device *adev,
>   	return r;
>   }
>   
> +static void amdgpu_device_unmap_mmio(struct amdgpu_device *adev)
> +{
> +	/* Clear all CPU mappings pointing to this device */
> +	unmap_mapping_range(adev->ddev.anon_inode->i_mapping, 0, 0, 1);
> +
> +	/* Unmap all mapped bars - Doorbell, registers and VRAM */
> +	amdgpu_device_doorbell_fini(adev);
> +
> +	iounmap(adev->rmmio);
> +	adev->rmmio = NULL;
> +	if (adev->mman.aper_base_kaddr)
> +		iounmap(adev->mman.aper_base_kaddr);
> +	adev->mman.aper_base_kaddr = NULL;
> +
> +	/* Memory manager related */
> +	if (!adev->gmc.xgmi.connected_to_cpu) {
> +		arch_phys_wc_del(adev->gmc.vram_mtrr);
> +		arch_io_free_memtype_wc(adev->gmc.aper_base, adev->gmc.aper_size);
> +	}
> +}
> +
>   /**
>    * amdgpu_device_fini - tear down the driver
>    *
> @@ -3712,6 +3733,8 @@ void amdgpu_device_fini_hw(struct amdgpu_device *adev)
>   	amdgpu_device_ip_fini_early(adev);
>   
>   	amdgpu_gart_dummy_page_fini(adev);
> +
> +	amdgpu_device_unmap_mmio(adev);
>   }
>   
>   void amdgpu_device_fini_sw(struct amdgpu_device *adev)
> @@ -3739,9 +3762,6 @@ void amdgpu_device_fini_sw(struct amdgpu_device *adev)
>   	}
>   	if ((adev->pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
>   		vga_client_register(adev->pdev, NULL, NULL, NULL);
> -	iounmap(adev->rmmio);
> -	adev->rmmio = NULL;
> -	amdgpu_device_doorbell_fini(adev);
>   
>   	if (IS_ENABLED(CONFIG_PERF_EVENTS))
>   		amdgpu_pmu_fini(adev);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> index 0adffcace326..8eabe3c9ad17 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> @@ -1107,10 +1107,6 @@ int amdgpu_bo_init(struct amdgpu_device *adev)
>   void amdgpu_bo_fini(struct amdgpu_device *adev)
>   {
>   	amdgpu_ttm_fini(adev);
> -	if (!adev->gmc.xgmi.connected_to_cpu) {
> -		arch_phys_wc_del(adev->gmc.vram_mtrr);
> -		arch_io_free_memtype_wc(adev->gmc.aper_base, adev->gmc.aper_size);
> -	}
>   }
>   
>   /**
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index 0d54e70278ca..58ad2fecc9e3 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -1841,10 +1841,6 @@ void amdgpu_ttm_fini(struct amdgpu_device *adev)
>   	amdgpu_bo_free_kernel(&adev->mman.discovery_memory, NULL, NULL);
>   	amdgpu_ttm_fw_reserve_vram_fini(adev);
>   
> -	if (adev->mman.aper_base_kaddr)
> -		iounmap(adev->mman.aper_base_kaddr);
> -	adev->mman.aper_base_kaddr = NULL;
> -
>   	amdgpu_vram_mgr_fini(adev);
>   	amdgpu_gtt_mgr_fini(adev);
>   	ttm_range_man_fini(&adev->mman.bdev, AMDGPU_PL_GDS);
>