This is a note to let you know that I've just added the patch titled
PCI/P2PDMA: Remove reference to pci_p2pdma_map_sg()
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pci-p2pdma-remove-reference-to-pci_p2pdma_map_sg.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9a000a72af75886e5de13f4edef7f0d788622e7d Mon Sep 17 00:00:00 2001
From: Tadeusz Struk <tstruk@xxxxxxxxxx>
Date: Mon, 13 Nov 2023 19:03:25 +0100
Subject: PCI/P2PDMA: Remove reference to pci_p2pdma_map_sg()
From: Tadeusz Struk <tstruk@xxxxxxxxxx>
commit 9a000a72af75886e5de13f4edef7f0d788622e7d upstream.
Update Documentation/driver-api/pci/p2pdma.rst doc and remove references to
obsolete p2pdma mapping functions.
Fixes: 0d06132fc84b ("PCI/P2PDMA: Remove pci_p2pdma_[un]map_sg()")
Link: https://lore.kernel.org/r/20231113180325.444692-1-tstruk@xxxxxxxxx
Signed-off-by: Tadeusz Struk <tstruk@xxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Reviewed-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Cc: stable@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
Documentation/driver-api/pci/p2pdma.rst | 16 +++-------------
1 file changed, 3 insertions(+), 13 deletions(-)
--- a/Documentation/driver-api/pci/p2pdma.rst
+++ b/Documentation/driver-api/pci/p2pdma.rst
@@ -83,19 +83,9 @@ this to include other types of resources
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
Patches currently in stable-queue which might be from tstruk@xxxxxxxxxx are
queue-6.6/pci-p2pdma-remove-reference-to-pci_p2pdma_map_sg.patch
