diff options
| author | Jason Gunthorpe <jgg@nvidia.com> | 2023-04-14 10:58:29 -0300 |
|---|---|---|
| committer | Leon Romanovsky <leon@kernel.org> | 2023-04-16 11:08:07 +0300 |
| commit | 8d7c7c0eeb74281c846ef9231ce20536c79a99b4 (patch) | |
| tree | b80b6fee2ff23604fd054ea29593ec8b6ece33c7 /include/rdma | |
| parent | b2b1ddc457458fecd1c6f385baa9fbda5f0c63ad (diff) | |
RDMA: Add ib_virt_dma_to_page()
Make it clearer what is going on by adding a function to go back from the
"virtual" dma_addr to a kva and another to a struct page. This is used in the
ib_uses_virt_dma() style drivers (siw, rxe, hfi, qib).
Call them instead of a naked casting and virt_to_page() when working with dma_addr
values encoded by the various ib_map functions.
This also fixes the virt_to_page() casting problem Linus Walleij has been
chasing.
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/0-v2-05ea785520ed+10-ib_virt_page_jgg@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Diffstat (limited to 'include/rdma')
| -rw-r--r-- | include/rdma/ib_verbs.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 949cf4ffc536..1e7774ac808f 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -4036,6 +4036,31 @@ static inline bool ib_dma_pci_p2p_dma_supported(struct ib_device *dev) } /** + * ib_virt_dma_to_ptr - Convert a dma_addr to a kernel pointer + * @dma_addr: The DMA address + * + * Used by ib_uses_virt_dma() devices to get back to the kernel pointer after + * going through the dma_addr marshalling. + */ +static inline void *ib_virt_dma_to_ptr(u64 dma_addr) +{ + /* virt_dma mode maps the kvs's directly into the dma addr */ + return (void *)(uintptr_t)dma_addr; +} + +/** + * ib_virt_dma_to_page - Convert a dma_addr to a struct page + * @dma_addr: The DMA address + * + * Used by ib_uses_virt_dma() device to get back to the struct page after going + * through the dma_addr marshalling. + */ +static inline struct page *ib_virt_dma_to_page(u64 dma_addr) +{ + return virt_to_page(ib_virt_dma_to_ptr(dma_addr)); +} + +/** * ib_dma_mapping_error - check a DMA addr for error * @dev: The device for which the dma_addr was created * @dma_addr: The DMA address to check |