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drm/gpusvm: use more selective dma dir in get_pages()

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If we are only reading the memory then from the device pov the direction
can be DMA_TO_DEVICE. This aligns with the xe-userptr code. Using the
most restrictive data direction to represent the access is normally a
good idea.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://lore.kernel.org/r/20250828142430.615826-12-matthew.auld@intel.com
This commit is contained in:
Matthew Auld
2025-08-28 15:24:33 +01:00
parent c50729c68a
commit ad70e289ed
1 changed files with 5 additions and 3 deletions
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8
drivers/gpu/drm/drm_gpusvm.c
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@@ -1224,6 +1224,8 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm,
struct dev_pagemap *pagemap;
struct drm_pagemap *dpagemap;
struct drm_gpusvm_range_flags flags;
enum dma_data_direction dma_dir = ctx->read_only ? DMA_TO_DEVICE :
DMA_BIDIRECTIONAL;
retry:
hmm_range.notifier_seq = mmu_interval_read_begin(notifier);
@@ -1329,7 +1331,7 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm,
dpagemap->ops->device_map(dpagemap,
gpusvm->drm->dev,
page, order,
DMA_BIDIRECTIONAL);
dma_dir);
if (dma_mapping_error(gpusvm->drm->dev,
range->dma_addr[j].addr)) {
err = -EFAULT;
@@ -1351,7 +1353,7 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm,
addr = dma_map_page(gpusvm->drm->dev,
page, 0,
PAGE_SIZE << order,
DMA_BIDIRECTIONAL);
dma_dir);
if (dma_mapping_error(gpusvm->drm->dev, addr)) {
err = -EFAULT;
goto err_unmap;
@@ -1359,7 +1361,7 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm,
range->dma_addr[j] = drm_pagemap_addr_encode
(addr, DRM_INTERCONNECT_SYSTEM, order,
DMA_BIDIRECTIONAL);
dma_dir);
}
i += 1 << order;
num_dma_mapped = i;