linux-kernel - [tip:x86/cache] x86/intel_rdt: Initialize bitmask of shareable resource if CDP enabled

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Message-ID: <tip-95953034fb24c16ad0047a98b16427e5935830c4@git.kernel.org>
Date:   Sat, 21 Oct 2017 08:18:52 -0700
From:   tip-bot for Reinette Chatre <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     vikas.shivappa@...ux.intel.com, tglx@...utronix.de,
        tony.luck@...el.com, fenghua.yu@...el.com,
        reinette.chatre@...el.com, hpa@...or.com, mingo@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip:x86/cache] x86/intel_rdt: Initialize bitmask of shareable
 resource if CDP enabled

Commit-ID:  95953034fb24c16ad0047a98b16427e5935830c4
Gitweb:     https://git.kernel.org/tip/95953034fb24c16ad0047a98b16427e5935830c4
Author:     Reinette Chatre <reinette.chatre@...el.com>
AuthorDate: Fri, 20 Oct 2017 02:16:57 -0700
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sat, 21 Oct 2017 17:12:21 +0200

x86/intel_rdt: Initialize bitmask of shareable resource if CDP enabled

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@...el.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Fenghua Yu <fenghua.yu@...el.com>
Acked-by: Vikas Shivappa <vikas.shivappa@...ux.intel.com>
Acked-by: Tony Luck <tony.luck@...el.com>
Link: https://lkml.kernel.org/r/815747bddc820ca221a8924edaf4d1a7324547e4.1508490116.git.reinette.chatre@intel.com

---
 arch/x86/kernel/cpu/intel_rdt.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c
index cd5fc61..88dcf84 100644
--- 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 type)
 	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;
 	/*