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FROMLIST: dma-buf: add support for virtio exported objects

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This change adds a new dma-buf operation that allows dma-bufs to be used
by virtio drivers to share exported objects. The new operation allows
the importing driver to query the exporting driver for the UUID which
identifies the underlying exported object.

Signed-off-by: David Stevens <[email protected]>

BUG=b:136269340
TEST=boot ARCVM and launch play store

Signed-off-by: Keiichi Watanabe <[email protected]>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2059086
Reviewed-by: Sean Paul <[email protected]>
Reviewed-by: Gurchetan Singh <[email protected]>
Tested-by: David Stevens <[email protected]>
Commit-Queue: David Stevens <[email protected]>
Bug: 153580313
Link: https://lore.kernel.org/lkml/[email protected]/
Change-Id: Ifb429e36ebbba9feead6fd1792fbefa9ca097f0c
Signed-off-by: Lingfeng Yang <[email protected]>
This commit is contained in:
David Stevens 2020-01-22 15:02:33 +09:00 • committed by Alistair Delva
commit 33bff2dd91
2 changed files with 27 additions and 0 deletions
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12
drivers/dma-buf/dma-buf.c
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@ -1203,6 +1203,18 @@ int dma_buf_get_flags(struct dma_buf *dmabuf, unsigned long *flags)
}
EXPORT_SYMBOL_GPL(dma_buf_get_flags);
int dma_buf_get_uuid(struct dma_buf *dmabuf, uuid_t *uuid)
{
if (WARN_ON(!dmabuf) || !uuid)
return -EINVAL;
if (!dmabuf->ops->get_uuid)
return -ENODEV;
return dmabuf->ops->get_uuid(dmabuf, uuid);
}
EXPORT_SYMBOL_GPL(dma_buf_get_uuid);
#ifdef CONFIG_DEBUG_FS
static int dma_buf_debug_show(struct seq_file *s, void *unused)
{