linux-kernel - [PATCH 4.14 36/75] x86/intel_rdt: Initialize bitmask of shareable resource if CDP enabled

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Message-Id: <20171207130820.236096002@linuxfoundation.org>
Date:   Thu,  7 Dec 2017 14:07:58 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Reinette Chatre <reinette.chatre@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.14 36/75] x86/intel_rdt: Initialize bitmask of shareable resource if CDP enabled

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Reinette Chatre <reinette.chatre@...el.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@...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
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;
 	/*