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habanalabs: fix dma_addr passed to dma_mmap_coherent

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When doing dma_alloc_coherent in the driver, we add a certain hard-coded
offset to the DMA address before returning to the callee function. This
offset is needed when our device use this DMA address to perform
outbound transactions to the host.

However, if we want to map the DMA'able memory to the user via
dma_mmap_coherent(), we need to pass the original dma address, without
this offset. Otherwise, we will get erronouos mapping.

Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
This commit is contained in:
Oded Gabbay 2021-01-11 13:49:38 +02:00
parent f970d1d01a
commit a9d4ef6434
2 changed files with 4 additions and 2 deletions
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3
drivers/misc/habanalabs/gaudi/gaudi.c
View File

@ -4002,7 +4002,8 @@ static int gaudi_cb_mmap(struct hl_device *hdev, struct vm_area_struct *vma,
vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP |
VM_DONTCOPY | VM_NORESERVE;
rc = dma_mmap_coherent(hdev->dev, vma, cpu_addr, dma_addr, size);
rc = dma_mmap_coherent(hdev->dev, vma, cpu_addr,
(dma_addr - HOST_PHYS_BASE), size);
if (rc)
dev_err(hdev->dev, "dma_mmap_coherent error %d", rc);

3
drivers/misc/habanalabs/goya/goya.c
View File

@ -2719,7 +2719,8 @@ static int goya_cb_mmap(struct hl_device *hdev, struct vm_area_struct *vma,
vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP |
VM_DONTCOPY | VM_NORESERVE;
rc = dma_mmap_coherent(hdev->dev, vma, cpu_addr, dma_addr, size);
rc = dma_mmap_coherent(hdev->dev, vma, cpu_addr,
(dma_addr - HOST_PHYS_BASE), size);
if (rc)
dev_err(hdev->dev, "dma_mmap_coherent error %d", rc);