PCI/P2PDMA: Remove reference to pci_p2pdma_map_sg()

commit 9a000a72af upstream.

Update Documentation/driver-api/pci/p2pdma.rst doc and remove references to
obsolete p2pdma mapping functions.

Fixes: 0d06132fc8 ("PCI/P2PDMA: Remove pci_p2pdma_[un]map_sg()")
Link: https://lore.kernel.org/r/20231113180325.444692-1-tstruk@gmail.com
Signed-off-by: Tadeusz Struk <tstruk@gigaio.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tadeusz Struk 2023-11-13 19:03:25 +01:00 committed by Greg Kroah-Hartman
parent 970c0899a4
commit d3c08d1015
1 changed files with 3 additions and 13 deletions

View File

@ -83,19 +83,9 @@ this to include other types of resources like doorbells.
Client Drivers
--------------
A client driver typically only has to conditionally change its DMA map
routine to use the mapping function :c:func:`pci_p2pdma_map_sg()` instead
of the usual :c:func:`dma_map_sg()` function. Memory mapped in this
way does not need to be unmapped.
The client may also, optionally, make use of
:c:func:`is_pci_p2pdma_page()` to determine when to use the P2P mapping
functions and when to use the regular mapping functions. In some
situations, it may be more appropriate to use a flag to indicate a
given request is P2P memory and map appropriately. It is important to
ensure that struct pages that back P2P memory stay out of code that
does not have support for them as other code may treat the pages as
regular memory which may not be appropriate.
A client driver only has to use the mapping API :c:func:`dma_map_sg()`
and :c:func:`dma_unmap_sg()` functions as usual, and the implementation
will do the right thing for the P2P capable memory.
Orchestrator Drivers