[4.14,36/75] x86/intel_rdt: Initialize bitmask of shareable resource if CDP enabled
diff mbox series

Message ID 20171207130820.236096002@linuxfoundation.org
State New, archived
Headers show
  • 4.14.5-stable review
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Commit Message

Greg Kroah-Hartman Dec. 7, 2017, 1:07 p.m. UTC
4.14-stable review patch.  If anyone has any objections, please let me know.


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

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/815747bddc820ca221a8924edaf4d1a7324547e4.1508490116.git.reinette.chatre@intel.com
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(+)

diff mbox series

--- 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;