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authorBjorn Helgaas <bhelgaas@google.com>2024-01-15 12:10:35 -0600
committerBjorn Helgaas <bhelgaas@google.com>2024-01-15 12:10:35 -0600
commit18c3850f313e1646a05fb016c9f6d5b7ad47e751 (patch)
tree71bd74ce258a7384d430158d0cb706b79fd24634
parent564af7a5363feae1d56d5b1985975c85d7864230 (diff)
parent9a000a72af75886e5de13f4edef7f0d788622e7d (diff)
Merge branch 'pci/p2pdma'
- Remove documentation for obsolete pci_p2pdma_map_sg() (Tadeusz Struk) * pci/p2pdma: PCI/P2PDMA: Remove reference to pci_p2pdma_map_sg()
-rw-r--r--Documentation/driver-api/pci/p2pdma.rst16
1 files changed, 3 insertions, 13 deletions
diff --git a/Documentation/driver-api/pci/p2pdma.rst b/Documentation/driver-api/pci/p2pdma.rst
index 44deb52beeb4..d0b241628cf1 100644
--- 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 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