[PATCH] drm/amdgpu: Unmap all MMIO mappings

[Andrey Grodzovsky]

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.grodzov...@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);
-- 
2.25.1