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ca36c36b78
Replace phys_to_dma()/dma_to_phys() looping algorithm with an O(1) algorithm The approach taken is inspired by the sparse memory implementation: take a certain number of high-order bits off the address them, use this as an index into a table containing an offset to the desired address and add it to the original value. There is a table for mapping physical addresses to DMA addresses and another one for the reverse mapping. The table sizes depend on how fine-grained the mappings need to be; Coarser granularity less to smaller tables. On a processor with 32-bit physical and DMA addresses, with 4 MIB granularity, memory usage is two 2048-byte arrays. Each 32-byte cache line thus covers 64 MiB of address space. Also, renames phys_to_bus() to phys_to_dma() and bus_to_phys() to dma_to_phys() to align with kernel usage. [Ralf: Fixed silly build breakage due to stackoverflow warning caused by huge array on stack.] Signed-off-by: David VomLehn <dvomlehn@cisco.com> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/1257/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org> |
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alchemy | ||
ar7 | ||
bcm47xx | ||
bcm63xx | ||
boot | ||
cavium-octeon | ||
cobalt | ||
configs | ||
dec | ||
emma | ||
fw | ||
gt64120/wrppmc | ||
include/asm | ||
jazz | ||
kernel | ||
lasat | ||
lib | ||
loongson | ||
math-emu | ||
mipssim | ||
mm | ||
mti-malta | ||
nxp | ||
oprofile | ||
pci | ||
pmc-sierra | ||
power | ||
powertv | ||
rb532 | ||
sgi-ip22 | ||
sgi-ip27 | ||
sgi-ip32 | ||
sibyte | ||
sni | ||
txx9 | ||
vr41xx | ||
Kconfig | ||
Kconfig.debug | ||
Makefile |