Thanks for the comments, but you are looking at a completely outdated patchset.
If you are interested in the newest one please ping me and I'm going to CC you when I send out the next version.
Christian.
Am 25.05.19 um 03:04 schrieb Hillf Danton:
On Tue, 16 Apr 2019 20:38:31 +0200 Christian König wrote:
Add function variants which can be called with the reservation lock already held.
v2: reordered, add lockdep asserts, fix kerneldoc v3: rebased on sgt caching
Signed-off-by: Christian König christian.koenig@amd.com
drivers/dma-buf/dma-buf.c | 63 +++++++++++++++++++++++++++++++++++++++ include/linux/dma-buf.h | 5 ++++ 2 files changed, 68 insertions(+)
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 65161a82d4d5..ef480e5fb239 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -623,6 +623,43 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach) } EXPORT_SYMBOL_GPL(dma_buf_detach); +/**
- dma_buf_map_attachment_locked - Maps the buffer into _device_ address space
- with the reservation lock held. Is a wrapper for map_dma_buf() of the
Something is missing; seems to be s/of the/of the dma_buf_ops./
- Returns the scatterlist table of the attachment;
- dma_buf_ops.
Oh it is sitting here!
- @attach: [in] attachment whose scatterlist is to be returned
- @direction: [in] direction of DMA transfer
- Returns sg_table containing the scatterlist to be returned; returns ERR_PTR
- on error. May return -EINTR if it is interrupted by a signal.
EINTR looks impossible in the code.
- A mapping must be unmapped by using dma_buf_unmap_attachment_locked(). Note
- that the underlying backing storage is pinned for as long as a mapping
- exists, therefore users/importers should not hold onto a mapping for undue
- amounts of time.
- */
+struct sg_table * +dma_buf_map_attachment_locked(struct dma_buf_attachment *attach,
enum dma_data_direction direction)+{
- struct sg_table *sg_table;
- might_sleep();
- reservation_object_assert_held(attach->dmabuf->resv);
- if (attach->sgt)
return attach->sgt;- sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction);
- if (!sg_table)
sg_table = ERR_PTR(-ENOMEM);- return sg_table;
+} +EXPORT_SYMBOL_GPL(dma_buf_map_attachment_locked);
Best Regards Hillf
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