Re: [PATCH v7 16/16] drm/amdgpu: Unmap all MMIO mappings

[Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>]

Ping

Andrey

On 2021-05-12 10:26 a.m., Andrey Grodzovsky wrote:
> Access to those must be prevented post pci_remove
>
> v6: Drop BOs list, unampping VRAM BAR is enough.
>
> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 24 +++++++++++++++++++---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_object.c |  1 +
>   drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c    |  4 ----
>   3 files changed, 22 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index f7cca25c0fa0..73cbc3c7453f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -3666,6 +3666,25 @@ 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 */
> +	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 +3731,8 @@ 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 +3760,6 @@ 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..882fb49f3c41 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> @@ -533,6 +533,7 @@ static int amdgpu_bo_do_create(struct amdgpu_device *adev,
>   		return -ENOMEM;
>   	drm_gem_private_object_init(adev_to_drm(adev), &bo->tbo.base, size);
>   	INIT_LIST_HEAD(&bo->shadow_list);
> +
>   	bo->vm_bo = NULL;
>   	bo->preferred_domains = bp->preferred_domain ? bp->preferred_domain :
>   		bp->domain;
> 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);