drm/amdgpu: Unmap all MMIO mappings

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>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210517193105.491461-1-andrey.grodzovsky@amd.com

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -3664,6 +3664,27 @@ 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
  *
@@ -3710,6 +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)
@@ -3737,9 +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);

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);
-	}
 }
 
 /**

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);