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

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On 2021-05-17 1:43 p.m., Alex Deucher wrote:
On Wed, May 12, 2021 at 10:27 AM Andrey Grodzovsky
<andrey.grodzovsky@xxxxxxx> 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 */

I think we need:
if (!adev->gmc.xgmi.connected_to_cpu) {
around these two to mirror amdgpu_bo_fini().

Alex

I am working of off drm-misc-next and here amdgpu_xgmi
doesn't have connected_to_cpu yet.

Andrey


+       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);
--
2.25.1

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