diff options
| author | Chris Leech <cleech@redhat.com> | 2024-02-05 12:01:37 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-03-07 21:52:59 +0000 |
| commit | 576882ef5e7fce030b65c92b508a0f84ea5a81c2 (patch) | |
| tree | 5fa1cdf6c13a80a6b3ca2498721d77ff99e25f1b /include/linux/uio_driver.h | |
| parent | 0e439ba38e615e505404b3935585f1898bafaea9 (diff) | |
uio: introduce UIO_MEM_DMA_COHERENT type
Add a UIO memtype specifically for sharing dma_alloc_coherent
memory with userspace, backed by dma_mmap_coherent.
This is mainly for the bnx2/bnx2x/bnx2i "cnic" interface, although there
are a few other uio drivers which map dma_alloc_coherent memory and will
be converted to use dma_mmap_coherent as well.
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Chris Leech <cleech@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240205200137.138302-1-cleech@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/uio_driver.h')
| -rw-r--r-- | include/linux/uio_driver.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/uio_driver.h b/include/linux/uio_driver.h index 47c5962b876b..18238dc8bfd3 100644 --- a/include/linux/uio_driver.h +++ b/include/linux/uio_driver.h @@ -28,19 +28,26 @@ struct uio_map; * logical, virtual, or physical & phys_addr_t * should always be large enough to handle any of * the address types) + * @dma_addr: DMA handle set by dma_alloc_coherent, used with + * UIO_MEM_DMA_COHERENT only (@addr should be the + * void * returned from the same dma_alloc_coherent call) * @offs: offset of device memory within the page * @size: size of IO (multiple of page size) * @memtype: type of memory addr points to * @internal_addr: ioremap-ped version of addr, for driver internal use + * @dma_device: device struct that was passed to dma_alloc_coherent, + * used with UIO_MEM_DMA_COHERENT only * @map: for use by the UIO core only. */ struct uio_mem { const char *name; phys_addr_t addr; + dma_addr_t dma_addr; unsigned long offs; resource_size_t size; int memtype; void __iomem *internal_addr; + struct device *dma_device; struct uio_map *map; }; @@ -158,6 +165,12 @@ extern int __must_check #define UIO_MEM_LOGICAL 2 #define UIO_MEM_VIRTUAL 3 #define UIO_MEM_IOVA 4 +/* + * UIO_MEM_DMA_COHERENT exists for legacy drivers that had been getting by with + * improperly mapping DMA coherent allocations through the other modes. + * Do not use in new drivers. + */ +#define UIO_MEM_DMA_COHERENT 5 /* defines for uio_port->porttype */ #define UIO_PORT_NONE 0 |