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| author |   Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com> | 2023-10-10 12:42:37 +0200 |
|---|---|---|
| committer |   Borislav Petkov (AMD) <bp@alien8.de> | 2023-10-11 21:48:52 +0200 |
| commit | 0e3cd31f6e9074886dea5a999bfcc563d144e7de (patch) | |
| tree | 66b98446f22df97be0ce4bbe61c1dd3fdafe274f /arch/x86/kernel/cpu/resctrl/internal.h | |
| parent | x86/resctrl: Rename arch_has_sparse_bitmaps (diff) | |
| download | wireguard-linux-0e3cd31f6e9074886dea5a999bfcc563d144e7de.tar.xz wireguard-linux-0e3cd31f6e9074886dea5a999bfcc563d144e7de.zip | |
x86/resctrl: Enable non-contiguous CBMs in Intel CAT
The setting for non-contiguous 1s support in Intel CAT is
hardcoded to false. On these systems, writing non-contiguous
1s into the schemata file will fail before resctrl passes
the value to the hardware.
In Intel CAT CPUID.0x10.1:ECX[3] and CPUID.0x10.2:ECX[3] stopped
being reserved and now carry information about non-contiguous 1s
value support for L3 and L2 cache respectively. The CAT
capacity bitmask (CBM) supports a non-contiguous 1s value if
the bit is set.
The exception are Haswell systems where non-contiguous 1s value
support needs to stay disabled since they can't make use of CPUID
for Cache allocation.
Originally-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Peter Newman <peternewman@google.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Peter Newman <peternewman@google.com>
Link: https://lore.kernel.org/r/1849b487256fe4de40b30f88450cba3d9abc9171.1696934091.git.maciej.wieczor-retman@intel.com
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/kernel/cpu/resctrl/internal.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h index 85ceaf9a31ac..c47ef2f13e8e 100644 --- a/arch/x86/kernel/cpu/resctrl/internal.h +++ b/arch/x86/kernel/cpu/resctrl/internal.h @@ -492,6 +492,15 @@ union cpuid_0x10_3_eax { unsigned int full; }; +/* CPUID.(EAX=10H, ECX=ResID).ECX */ +union cpuid_0x10_x_ecx { + struct { + unsigned int reserved:3; + unsigned int noncont:1; + } split; + unsigned int full; +}; + /* CPUID.(EAX=10H, ECX=ResID).EDX */ union cpuid_0x10_x_edx { struct { |