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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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55af8a9164
When dma-coherent transfers are enabled, the mmap call must not change the pg_prot flags in the vma struct. Split the arm_dma_mmap into a common and specific parts, and add a "arm_coherent_dma_mmap" implementation that does not alter the page protection flags. Tested on a topic-miami board (Zynq) using the ACP port to transfer data between FPGA and CPU using the Dyplo framework. Without this patch, byte-wise access to mmapped coherent DMA memory was about 20x slower because of the memory being marked as non-cacheable, and transfer speeds would not exceed 240MB/s. After this patch, the mapped memory is cacheable and the transfer speed is again 600MB/s (limited by the FPGA) when the data is in the L2 cache, while data integrity is being maintained. The patch has no effect on non-coherent DMA. Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> |
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| boot | ||
| common | ||
| configs | ||
| crypto | ||
| firmware | ||
| include | ||
| kernel | ||
| kvm | ||
| lib | ||
| mach-alpine | ||
| mach-asm9260 | ||
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| mach-zynq | ||
| mm | ||
| net | ||
| nwfpe | ||
| oprofile | ||
| plat-iop | ||
| plat-omap | ||
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| probes | ||
| tools | ||
| vdso | ||
| vfp | ||
| xen | ||
| Kconfig | ||
| Kconfig-nommu | ||
| Kconfig.debug | ||
| Makefile | ||