Hi all,
If i need to allocate a scatter/gather list of 8 pages with 4k each
will this structure do for me
dma_attr.dma_attr_version = DMA_ATTR_V0;
dma_attr.dma_attr_addr_lo = 0x0000000000000000ull;
dma_attr.dma_attr_addr_hi = 0xFFFFFFFFFFFFFFFFull;
dma_attr.dma_attr_count_max = 0x00000000FFFFFFFFull;
dma_attr.dma_attr_align = 0x1000;
dma_attr.dma_attr_burstsizes = 0x00000FFF;
dma_attr.dma_attr_minxfer = 0x1000;
dma_attr.dma_attr_maxxfer = 0x00000000FFFFFFFFull;
dma_attr.dma_attr_seg = 0xFFFFFFFFFFFFFFFFull;
dma_attr.dma_attr_sgllen = 8;
dma_attr.dma_attr_granular = 1; // min
Kindly let me know if there are any cases in which this allocation
scheme would not work. Is it better to allocate big page of 32k and split in
the driver.The card supports scatter/gather so i wanted to use of
the feature.Which one is expensive in terms of iommu tlb entries
etc.
Thanks and Regards,
Mahesh
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