From 31891068c8d57d28260dd2c7ef8ca4faf8cffe7e Mon Sep 17 00:00:00 2001 From: Yang Rong Date: Mon, 28 Dec 2015 10:40:14 +0800 Subject: SKL: use the hw defautl value mocs index before linux 4.3. From linux 4.3, kernel redefined the mocs table's value, But before 4.3, still used the hw defautl value. Signed-off-by: Yang Rong Reviewed-by: Ruiling Song --- src/intel/intel_gpgpu.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/src/intel/intel_gpgpu.c b/src/intel/intel_gpgpu.c index dfe2af38..b55e0751 100644 --- a/src/intel/intel_gpgpu.c +++ b/src/intel/intel_gpgpu.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include #include @@ -284,7 +285,20 @@ intel_gpgpu_get_cache_ctrl_gen9() { //Kernel-defined cache control registers 2: //L3CC: WB; LeCC: WB; TC: LLC/eLLC; - return (0x2 << 1); + int major = 0, minor = 0; + int mocs_index = 0x2; + + struct utsname buf; + uname(&buf); + sscanf(buf.release, "%d.%d", &major, &minor); + //From linux 4.3, kernel redefined the mocs table's value, + //But before 4.3, still used the hw defautl value. + if(strcmp(buf.sysname, "Linux") == 0 && + major == 4 && minor < 3) { /* linux kernel support skl from 4.x, so check from 4 */ + mocs_index = 0x9; + } + + return (mocs_index << 1); } static void -- cgit v1.2.1