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| author | Leon Romanovsky <leonro@nvidia.com> | 2025-11-20 12:28:22 +0300 |
|---|---|---|
| committer | Alex Williamson <alex@shazbot.org> | 2025-11-20 22:01:52 +0300 |
| commit | 372d6d1b8ae3cdfe6b0638a0a848c6865ec94567 (patch) | |
| tree | f2607bae1e226115b662cf94f243c21d8ae50628 /include/linux | |
| parent | d4504262f745e48c1739c8b864f779b4b0f9de80 (diff) | |
| download | linux-372d6d1b8ae3cdfe6b0638a0a848c6865ec94567.tar.xz | |
PCI/P2PDMA: Refactor to separate core P2P functionality from memory allocation
Refactor the PCI P2PDMA subsystem to separate the core peer-to-peer DMA
functionality from the optional memory allocation layer. This creates a
two-tier architecture:
The core layer provides P2P mapping functionality for physical addresses
based on PCI device MMIO BARs and integrates with the DMA API for
mapping operations. This layer is required for all P2PDMA users.
The optional upper layer provides memory allocation capabilities
including gen_pool allocator, struct page support, and sysfs interface
for user space access.
This separation allows subsystems like DMABUF to use only the core P2P
mapping functionality without the overhead of memory allocation features
they don't need. The core functionality is now available through the
new pcim_p2pdma_provider() function that returns a p2pdma_provider
structure.
Tested-by: Alex Mastro <amastro@fb.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Acked-by: Ankit Agrawal <ankita@nvidia.com>
Link: https://lore.kernel.org/r/20251120-dmabuf-vfio-v9-3-d7f71607f371@nvidia.com
Signed-off-by: Alex Williamson <alex@shazbot.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/pci-p2pdma.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/pci-p2pdma.h b/include/linux/pci-p2pdma.h index 9516ef97b17a..15471252817b 100644 --- a/include/linux/pci-p2pdma.h +++ b/include/linux/pci-p2pdma.h @@ -27,6 +27,8 @@ struct p2pdma_provider { }; #ifdef CONFIG_PCI_P2PDMA +int pcim_p2pdma_init(struct pci_dev *pdev); +struct p2pdma_provider *pcim_p2pdma_provider(struct pci_dev *pdev, int bar); int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, u64 offset); int pci_p2pdma_distance_many(struct pci_dev *provider, struct device **clients, @@ -44,6 +46,15 @@ int pci_p2pdma_enable_store(const char *page, struct pci_dev **p2p_dev, ssize_t pci_p2pdma_enable_show(char *page, struct pci_dev *p2p_dev, bool use_p2pdma); #else /* CONFIG_PCI_P2PDMA */ +static inline int pcim_p2pdma_init(struct pci_dev *pdev) +{ + return -EOPNOTSUPP; +} +static inline struct p2pdma_provider *pcim_p2pdma_provider(struct pci_dev *pdev, + int bar) +{ + return NULL; +} static inline int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, u64 offset) { |