4.14-stable review patch. If anyone has any objections, please let me know.
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From: Reinette Chatre reinette.chatre@intel.com
[ Upstream commit 95953034fb24c16ad0047a98b16427e5935830c4 ]
The platform informs via CPUID.(EAX=0x10, ECX=res#):EBX[31:0] (valid res# are only 1 for L3 and 2 for L2) which unit of the allocation may be used by other entities in the platform. This information is valid whether CDP (Code and Data Prioritization) is enabled or not.
Ensure that the bitmask of shareable resource is initialized when CDP is enabled.
Fixes: 0dd2d7494cd8 ("x86/intel_rdt: Show bitmask of shareable resource with other executing units" Signed-off-by: Reinette Chatre reinette.chatre@intel.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Acked-by: Fenghua Yu fenghua.yu@intel.com Acked-by: Vikas Shivappa vikas.shivappa@linux.intel.com Acked-by: Tony Luck tony.luck@intel.com Link: https://lkml.kernel.org/r/815747bddc820ca221a8924edaf4d1a7324547e4.150849011... Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kernel/cpu/intel_rdt.c | 1 + 1 file changed, 1 insertion(+)
--- a/arch/x86/kernel/cpu/intel_rdt.c +++ b/arch/x86/kernel/cpu/intel_rdt.c @@ -267,6 +267,7 @@ static void rdt_get_cdp_l3_config(int ty r->num_closid = r_l3->num_closid / 2; r->cache.cbm_len = r_l3->cache.cbm_len; r->default_ctrl = r_l3->default_ctrl; + r->cache.shareable_bits = r_l3->cache.shareable_bits; r->data_width = (r->cache.cbm_len + 3) / 4; r->alloc_capable = true; /*