drm/amdgpu: fix IH ring allocation for bus addresses (v2)

Use pci_alloc_consistent rather than kzalloc since we
need 256 byte aligned memory for the ring buffer.

v2: fix copy paste typo in free function noticed
by Jammy.

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=91749

Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

1 files changed, 7 insertions, 13 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c
index 90044b254404..5c8a803acedc 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c
@@ -98,18 +98,12 @@ int amdgpu_ih_ring_init(struct amdgpu_device *adev, unsigned ring_size,
                         /* add 8 bytes for the rptr/wptr shadows and
                          * add them to the end of the ring allocation.
                          */
-                        adev->irq.ih.ring = kzalloc(adev->irq.ih.ring_size + 8, GFP_KERNEL);
+                        adev->irq.ih.ring = pci_alloc_consistent(adev->pdev,
+                                                                 adev->irq.ih.ring_size + 8,
+                                                                 &adev->irq.ih.rb_dma_addr);
                         if (adev->irq.ih.ring == NULL)
                                 return -ENOMEM;
-                        adev->irq.ih.rb_dma_addr = pci_map_single(adev->pdev,
-                                                                  (void *)adev->irq.ih.ring,
-                                                                  adev->irq.ih.ring_size,
-                                                                  PCI_DMA_BIDIRECTIONAL);
-                        if (pci_dma_mapping_error(adev->pdev, adev->irq.ih.rb_dma_addr)) {
-                                dev_err(&adev->pdev->dev, "Failed to DMA MAP the IH RB page\n");
-                                kfree((void *)adev->irq.ih.ring);
-                                return -ENOMEM;
-                        }
+                        memset((void *)adev->irq.ih.ring, 0, adev->irq.ih.ring_size + 8);
                         adev->irq.ih.wptr_offs = (adev->irq.ih.ring_size / 4) + 0;
                         adev->irq.ih.rptr_offs = (adev->irq.ih.ring_size / 4) + 1;
                 }
@@ -149,9 +143,9 @@ void amdgpu_ih_ring_fini(struct amdgpu_device *adev)
                         /* add 8 bytes for the rptr/wptr shadows and
                          * add them to the end of the ring allocation.
                          */
-                        pci_unmap_single(adev->pdev, adev->irq.ih.rb_dma_addr,
-                                         adev->irq.ih.ring_size + 8, PCI_DMA_BIDIRECTIONAL);
-                        kfree((void *)adev->irq.ih.ring);
+                        pci_free_consistent(adev->pdev, adev->irq.ih.ring_size + 8,
+                                            (void *)adev->irq.ih.ring,
+                                            adev->irq.ih.rb_dma_addr);
                         adev->irq.ih.ring = NULL;
                 }
         } else {