diff options
| author | Vladimir Murzin <[email protected]> | 2017-06-26 10:18:57 +0100 |
|---|---|---|
| committer | Christoph Hellwig <[email protected]> | 2017-06-28 06:55:02 -0700 |
| commit | c41f9ea998f3ba61f38fa350eef28ec6caf0a07d (patch) | |
| tree | 6973acbeacd3b807b1a33608ca9bc08395743b4c /include/linux/fpga/fpga-mgr.h | |
| parent | 25f1e18870881f3366a5abec27b651983ce9032c (diff) | |
drivers: dma-coherent: Account dma_pfn_offset when used with device tree
dma_declare_coherent_memory() and friends are designed to account
difference in CPU and device addresses. However, when it is used with
reserved memory regions there is assumption that CPU and device have
the same view on address space. This assumption gets invalid when
reserved memory for coherent DMA allocations is referenced by device
with non-empty "dma-range" property.
Simply feeding device address as rmem->base + dev->dma_pfn_offset
would not work due to reserved memory region can be shared, so this
patch turns device address to be expressed with help of CPU address
and device's dma_pfn_offset in case memory reservation has been done
via device tree; non device tree users continue to use the old scheme.
Cc: Michal Nazarewicz <[email protected]>
Cc: Marek Szyprowski <[email protected]>
Cc: Roger Quadros <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Tested-by: Benjamin Gaignard <[email protected]>
Tested-by: Andras Szemzo <[email protected]>
Tested-by: Alexandre TORGUE <[email protected]>
Signed-off-by: Vladimir Murzin <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Diffstat (limited to 'include/linux/fpga/fpga-mgr.h')
0 files changed, 0 insertions, 0 deletions