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b7e32bef4a
Reading out of write-combining mapped memory is typically very slow since the CPU doesn't prefetch. However some archs have special instructions to do this. So add a best-effort memcpy_from_wc taking dma-buf-map pointer arguments that attempts to use a fast prefetching memcpy and otherwise falls back to ordinary memcopies, taking the iomem tagging into account. The code is largely copied from i915_memcpy_from_wc. Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Christian König <christian.koenig@amd.com> Suggested-by: Daniel Vetter <daniel@ffwll.ch> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Acked-by: Christian König <christian.koenig@amd.com> Acked-by: Daniel Vetter <daniel@ffwll.ch> Link: https://lore.kernel.org/r/20210602083818.241793-5-thomas.hellstrom@linux.intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20210602083818.241793-5-thomas.hellstrom@linux.intel.com |
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| .. | ||
| bridge | ||
| dp-mst | ||
| rfc | ||
| afbc.rst | ||
| amdgpu-dc.rst | ||
| amdgpu.rst | ||
| backlight.rst | ||
| drivers.rst | ||
| drm-client.rst | ||
| drm-internals.rst | ||
| drm-kms-helpers.rst | ||
| drm-kms.rst | ||
| drm-mm.rst | ||
| drm-uapi.rst | ||
| i915.rst | ||
| index.rst | ||
| introduction.rst | ||
| kms-properties.csv | ||
| komeda-kms.rst | ||
| mcde.rst | ||
| meson.rst | ||
| msm-crash-dump.rst | ||
| pl111.rst | ||
| tegra.rst | ||
| todo.rst | ||
| tve200.rst | ||
| v3d.rst | ||
| vc4.rst | ||
| vga-switcheroo.rst | ||
| vgaarbiter.rst | ||
| vkms.rst | ||
| xen-front.rst | ||