On Wed, 13 Dec 2006 03:59:45 GMT
Linux Kernel Mailing List <[email protected]> wrote:
> IB: Add DMA mapping functions to allow device drivers to interpose
>
> The QLogic InfiniPath HCAs use programmed I/O instead of HW DMA.
> This patch allows a verbs device driver to interpose on DMA mapping
> function calls in order to avoid relying on bus_to_virt() and
> phys_to_virt() to undo the mappings created by dma_map_single(),
> dma_map_sg(), etc.
>
> Signed-off-by: Ralph Campbell <[email protected]>
> Signed-off-by: Roland Dreier <[email protected]>
include/rdma/ib_verbs.h: In function 'ib_dma_alloc_coherent':
include/rdma/ib_verbs.h:1635: warning: passing argument 3 of 'dma_alloc_coherent' from incompatible pointer type
In file included from drivers/infiniband/hw/mthca/mthca_provider.h:41,
from drivers/infiniband/hw/mthca/mthca_dev.h:53,
from drivers/infiniband/hw/mthca/mthca_main.c:44:
include/rdma/ib_verbs.h: In function 'ib_dma_alloc_coherent':
include/rdma/ib_verbs.h:1635: warning: passing argument 3 of 'dma_alloc_coherent' from incompatible pointer type
That u64 needs to become a dma_addr_t. That means that
ib_dma_mapping_ops.alloc_coherent() and ib_dma_mapping_ops.free_coherent() are
wrong as well.
> +struct ib_dma_mapping_ops {
> ...
> + void *(*alloc_coherent)(struct ib_device *dev,
> + size_t size,
> + u64 *dma_handle,
> + gfp_t flag);
> + void (*free_coherent)(struct ib_device *dev,
> + size_t size, void *cpu_addr,
> + u64 dma_handle);
> +};
I'd have picked this up if it had been in git-infiniband for even a couple
of days. I'm assuming this all got slammed into mainline because of the
merge window thing.
I cannot find these patches on the kernel mailing list. I cannot find the
pull request anywhere.
> +static inline u64 ib_dma_map_single(struct ib_device *dev,
> + void *cpu_addr, size_t size,
> + enum dma_data_direction direction)
no, dma_map_single() returns a dma_addr_t.
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