From: Alexander Sverdlin Date: Mon, 25 Jul 2022 09:17:39 +0000 (+0200) Subject: MIPS: Introduce CAVIUM_RESERVE32 Kconfig option X-Git-Tag: v6.0-rc1~82^2~2 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=3e3114ac460e94825e34d1fed6a48a9ce4b07689;p=thirdparty%2Fkernel%2Flinux.git MIPS: Introduce CAVIUM_RESERVE32 Kconfig option This options is used to reserve a shared memory region for user processes to use for hardware memory buffers. The actual code to support the option comes in the following patch. Signed-off-by: Corey Minyard Signed-off-by: Alexander Sverdlin Signed-off-by: Thomas Bogendoerfer --- diff --git a/arch/mips/cavium-octeon/Kconfig b/arch/mips/cavium-octeon/Kconfig index 4984e462be303..c1899f109e19c 100644 --- a/arch/mips/cavium-octeon/Kconfig +++ b/arch/mips/cavium-octeon/Kconfig @@ -67,6 +67,18 @@ config CAVIUM_OCTEON_LOCK_L2_MEMCPY help Lock the kernel's implementation of memcpy() into L2. +config CAVIUM_RESERVE32 + int "Memory to reserve for user processes shared region (MB)" + range 0 1536 + default "0" + help + Reserve a shared memory region for user processes to use for hardware + memory buffers. This is required for 32bit applications to be able to + send and receive packets directly. Applications access this memory by + memory mapping /dev/mem for the addresses in /proc/octeon_info. For + optimal performance with HugeTLBs, keep this size an even number of + megabytes. + config OCTEON_ILM tristate "Module to measure interrupt latency using Octeon CIU Timer" help