vduse: implement DMA sync callbacks

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Since commit 295525e29a ("virtio_net: merge dma
operations when filling mergeable buffers"), VDUSE device
require support for DMA's .sync_single_for_cpu() operation
as the memory is non-coherent between the device and CPU
because of the use of a bounce buffer.

This patch implements both .sync_single_for_cpu() and
.sync_single_for_device() callbacks, and also skip bounce
buffer copies during DMA map and unmap operations if the
DMA_ATTR_SKIP_CPU_SYNC attribute is set to avoid extra
copies of the same buffer.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Message-Id: <20240219170606.587290-1-maxime.coquelin@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

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This commit is contained in:

Maxime Coquelin 2024-02-19 18:06:06 +01:00 • committed by Michael S. Tsirkin

parent 749a401683

commit d7b4e3287c

3 changed files with 54 additions and 3 deletions

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27

drivers/vdpa/vdpa_user/iova_domain.c

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8

drivers/vdpa/vdpa_user/iova_domain.h

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22

drivers/vdpa/vdpa_user/vduse_dev.c

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