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Date: Wed, 26 Oct 2016 14:27:57 -0700
From: tip-bot for Fenghua Yu <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: fenghua.yu@...el.com, linux-kernel@...r.kernel.org,
davidcc@...gle.com, eranian@...gle.com, h.peter.anvin@...el.com,
sai.praneeth.prakhya@...el.com, hpa@...or.com, tony.luck@...el.com,
peterz@...radead.org, bp@...e.de, ravi.v.shankar@...el.com,
vikas.shivappa@...ux.intel.com, nilayvaish@...il.com,
tglx@...utronix.de, mingo@...e.hu, shli@...com, mingo@...nel.org,
dave.hansen@...el.com
Subject: [tip:x86/cache] x86/intel_rdt: Add Haswell feature discovery
Commit-ID: 113c60970cf41723891e3a1b303517eaf8510bb5
Gitweb: http://git.kernel.org/tip/113c60970cf41723891e3a1b303517eaf8510bb5
Author: Fenghua Yu <fenghua.yu@...el.com>
AuthorDate: Sat, 22 Oct 2016 06:19:54 -0700
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 26 Oct 2016 23:12:38 +0200
x86/intel_rdt: Add Haswell feature discovery
Some Haswell generation CPUs support RDT, but they don't enumerate this via
CPUID. Use rdmsr_safe() and wrmsr_safe() to probe the MSRs on cpu model 63
(INTEL_FAM6_HASWELL_X)
Move the relevant defines into a common header file which is shared between
RDT/CQM and RDT/Allocation to avoid duplication.
Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
Cc: "Ravi V Shankar" <ravi.v.shankar@...el.com>
Cc: "Tony Luck" <tony.luck@...el.com>
Cc: "David Carrillo-Cisneros" <davidcc@...gle.com>
Cc: "Sai Prakhya" <sai.praneeth.prakhya@...el.com>
Cc: "Peter Zijlstra" <peterz@...radead.org>
Cc: "Stephane Eranian" <eranian@...gle.com>
Cc: "Dave Hansen" <dave.hansen@...el.com>
Cc: "Shaohua Li" <shli@...com>
Cc: "Nilay Vaish" <nilayvaish@...il.com>
Cc: "Vikas Shivappa" <vikas.shivappa@...ux.intel.com>
Cc: "Ingo Molnar" <mingo@...e.hu>
Cc: "Borislav Petkov" <bp@...e.de>
Cc: "H. Peter Anvin" <h.peter.anvin@...el.com>
Link: http://lkml.kernel.org/r/1477142405-32078-8-git-send-email-fenghua.yu@intel.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
arch/x86/events/intel/cqm.c | 2 +-
arch/x86/include/asm/intel_rdt.h | 6 ++++
arch/x86/include/asm/intel_rdt_common.h | 6 ++++
arch/x86/kernel/cpu/intel_rdt.c | 49 ++++++++++++++++++++++++++++++---
4 files changed, 58 insertions(+), 5 deletions(-)
diff --git a/arch/x86/events/intel/cqm.c b/arch/x86/events/intel/cqm.c
index 8f82b02..df86874 100644
--- a/arch/x86/events/intel/cqm.c
+++ b/arch/x86/events/intel/cqm.c
@@ -7,9 +7,9 @@
#include <linux/perf_event.h>
#include <linux/slab.h>
#include <asm/cpu_device_id.h>
+#include <asm/intel_rdt_common.h>
#include "../perf_event.h"
-#define MSR_IA32_PQR_ASSOC 0x0c8f
#define MSR_IA32_QM_CTR 0x0c8e
#define MSR_IA32_QM_EVTSEL 0x0c8d
diff --git a/arch/x86/include/asm/intel_rdt.h b/arch/x86/include/asm/intel_rdt.h
new file mode 100644
index 0000000..3aca86d
--- /dev/null
+++ b/arch/x86/include/asm/intel_rdt.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_X86_INTEL_RDT_H
+#define _ASM_X86_INTEL_RDT_H
+
+#define IA32_L3_CBM_BASE 0xc90
+
+#endif /* _ASM_X86_INTEL_RDT_H */
diff --git a/arch/x86/include/asm/intel_rdt_common.h b/arch/x86/include/asm/intel_rdt_common.h
new file mode 100644
index 0000000..e6e15cf
--- /dev/null
+++ b/arch/x86/include/asm/intel_rdt_common.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_X86_INTEL_RDT_COMMON_H
+#define _ASM_X86_INTEL_RDT_COMMON_H
+
+#define MSR_IA32_PQR_ASSOC 0x0c8f
+
+#endif /* _ASM_X86_INTEL_RDT_COMMON_H */
diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c
index 7d7aebe..f8e35cf 100644
--- a/arch/x86/kernel/cpu/intel_rdt.c
+++ b/arch/x86/kernel/cpu/intel_rdt.c
@@ -27,16 +27,57 @@
#include <linux/slab.h>
#include <linux/err.h>
+#include <asm/intel_rdt_common.h>
+#include <asm/intel-family.h>
+#include <asm/intel_rdt.h>
+
+/*
+ * cache_alloc_hsw_probe() - Have to probe for Intel haswell server CPUs
+ * as they do not have CPUID enumeration support for Cache allocation.
+ * The check for Vendor/Family/Model is not enough to guarantee that
+ * the MSRs won't #GP fault because only the following SKUs support
+ * CAT:
+ * Intel(R) Xeon(R) CPU E5-2658 v3 @ 2.20GHz
+ * Intel(R) Xeon(R) CPU E5-2648L v3 @ 1.80GHz
+ * Intel(R) Xeon(R) CPU E5-2628L v3 @ 2.00GHz
+ * Intel(R) Xeon(R) CPU E5-2618L v3 @ 2.30GHz
+ * Intel(R) Xeon(R) CPU E5-2608L v3 @ 2.00GHz
+ * Intel(R) Xeon(R) CPU E5-2658A v3 @ 2.20GHz
+ *
+ * Probe by trying to write the first of the L3 cach mask registers
+ * and checking that the bits stick. Max CLOSids is always 4 and max cbm length
+ * is always 20 on hsw server parts. The minimum cache bitmask length
+ * allowed for HSW server is always 2 bits. Hardcode all of them.
+ */
+static inline bool cache_alloc_hsw_probe(void)
+{
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
+ boot_cpu_data.x86 == 6 &&
+ boot_cpu_data.x86_model == INTEL_FAM6_HASWELL_X) {
+ u32 l, h, max_cbm = BIT_MASK(20) - 1;
+
+ if (wrmsr_safe(IA32_L3_CBM_BASE, max_cbm, 0))
+ return false;
+ rdmsr(IA32_L3_CBM_BASE, l, h);
+
+ /* If all the bits were set in MSR, return success */
+ return l == max_cbm;
+ }
+
+ return false;
+}
+
static inline bool get_rdt_resources(void)
{
- bool ret = false;
+ if (cache_alloc_hsw_probe())
+ return true;
if (!boot_cpu_has(X86_FEATURE_RDT_A))
return false;
- if (boot_cpu_has(X86_FEATURE_CAT_L3))
- ret = true;
+ if (!boot_cpu_has(X86_FEATURE_CAT_L3))
+ return false;
- return ret;
+ return true;
}
static int __init intel_rdt_late_init(void)
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