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Message-ID: <1241024107-14535-2-git-send-email-borislav.petkov@amd.com>
Date: Wed, 29 Apr 2009 18:54:47 +0200
From: Borislav Petkov <borislav.petkov@....com>
To: akpm@...ux-foundation.org, greg@...ah.com
CC: mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
dougthompson@...ssion.com, <linux-kernel@...r.kernel.org>,
Borislav Petkov <borislav.petkov@....com>
Subject: [PATCH 01/21] x86: add methods for writing of an MSR on several CPUs
- Rename msr-on-cpu.c to msr.c accordingly.
Signed-off-by: Borislav Petkov <borislav.petkov@....com>
---
arch/x86/include/asm/msr.h | 11 +++
arch/x86/lib/Makefile | 2 +-
arch/x86/lib/msr-on-cpu.c | 97 ----------------------------
arch/x86/lib/msr.c | 151 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 163 insertions(+), 98 deletions(-)
delete mode 100644 arch/x86/lib/msr-on-cpu.c
create mode 100644 arch/x86/lib/msr.c
diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index 638bf62..43d9537 100644
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -2,6 +2,7 @@
#define _ASM_X86_MSR_H
#include <asm/msr-index.h>
+#include <asm/cpumask.h>
#ifndef __ASSEMBLY__
# include <linux/types.h>
@@ -216,6 +217,8 @@ do { \
#ifdef CONFIG_SMP
int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
+int rdmsr_on_cpus(const cpumask_t *mask, u32 msr_no, u32 *l, u32 *h);
+int wrmsr_on_cpus(const cpumask_t *mask, u32 msr_no, u32 *l, u32 *h);
int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
#else /* CONFIG_SMP */
@@ -229,6 +232,14 @@ static inline int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
wrmsr(msr_no, l, h);
return 0;
}
+static inline int rdmsr_on_cpus(const cpumask_t *m, u32 msr_no, u32 *l, u32 *h)
+{
+ return rdmsr_on_cpu(msr_no, l, h);
+}
+static inline int wrmsr_on_cpus(const cpumask_t *m, u32 msr_no, u32 *l, u32 *h)
+{
+ return wrmsr_on_cpu(msr_no, l, h);
+}
static inline int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no,
u32 *l, u32 *h)
{
diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
index 55e11aa..f9d3563 100644
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -2,7 +2,7 @@
# Makefile for x86 specific library files.
#
-obj-$(CONFIG_SMP) := msr-on-cpu.o
+obj-$(CONFIG_SMP) := msr.o
lib-y := delay.o
lib-y += thunk_$(BITS).o
diff --git a/arch/x86/lib/msr-on-cpu.c b/arch/x86/lib/msr-on-cpu.c
deleted file mode 100644
index 321cf72..0000000
--- a/arch/x86/lib/msr-on-cpu.c
+++ /dev/null
@@ -1,97 +0,0 @@
-#include <linux/module.h>
-#include <linux/preempt.h>
-#include <linux/smp.h>
-#include <asm/msr.h>
-
-struct msr_info {
- u32 msr_no;
- u32 l, h;
- int err;
-};
-
-static void __rdmsr_on_cpu(void *info)
-{
- struct msr_info *rv = info;
-
- rdmsr(rv->msr_no, rv->l, rv->h);
-}
-
-static void __wrmsr_on_cpu(void *info)
-{
- struct msr_info *rv = info;
-
- wrmsr(rv->msr_no, rv->l, rv->h);
-}
-
-int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
-{
- int err;
- struct msr_info rv;
-
- rv.msr_no = msr_no;
- err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1);
- *l = rv.l;
- *h = rv.h;
-
- return err;
-}
-
-int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
-{
- int err;
- struct msr_info rv;
-
- rv.msr_no = msr_no;
- rv.l = l;
- rv.h = h;
- err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1);
-
- return err;
-}
-
-/* These "safe" variants are slower and should be used when the target MSR
- may not actually exist. */
-static void __rdmsr_safe_on_cpu(void *info)
-{
- struct msr_info *rv = info;
-
- rv->err = rdmsr_safe(rv->msr_no, &rv->l, &rv->h);
-}
-
-static void __wrmsr_safe_on_cpu(void *info)
-{
- struct msr_info *rv = info;
-
- rv->err = wrmsr_safe(rv->msr_no, rv->l, rv->h);
-}
-
-int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
-{
- int err;
- struct msr_info rv;
-
- rv.msr_no = msr_no;
- err = smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 1);
- *l = rv.l;
- *h = rv.h;
-
- return err ? err : rv.err;
-}
-
-int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
-{
- int err;
- struct msr_info rv;
-
- rv.msr_no = msr_no;
- rv.l = l;
- rv.h = h;
- err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1);
-
- return err ? err : rv.err;
-}
-
-EXPORT_SYMBOL(rdmsr_on_cpu);
-EXPORT_SYMBOL(wrmsr_on_cpu);
-EXPORT_SYMBOL(rdmsr_safe_on_cpu);
-EXPORT_SYMBOL(wrmsr_safe_on_cpu);
diff --git a/arch/x86/lib/msr.c b/arch/x86/lib/msr.c
new file mode 100644
index 0000000..4948de1
--- /dev/null
+++ b/arch/x86/lib/msr.c
@@ -0,0 +1,151 @@
+#include <linux/module.h>
+#include <linux/preempt.h>
+#include <linux/smp.h>
+#include <asm/msr.h>
+
+struct msr_info {
+ u32 msr_no;
+ u32 l, h;
+ int err;
+};
+
+static void __rdmsr_on_cpu(void *info)
+{
+ struct msr_info *rv = info;
+
+ rdmsr(rv->msr_no, rv->l, rv->h);
+}
+
+static void __wrmsr_on_cpu(void *info)
+{
+ struct msr_info *rv = info;
+
+ wrmsr(rv->msr_no, rv->l, rv->h);
+}
+
+int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
+{
+ int err;
+ struct msr_info rv;
+
+ rv.msr_no = msr_no;
+ err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1);
+ *l = rv.l;
+ *h = rv.h;
+
+ return err;
+}
+
+int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
+{
+ int err;
+ struct msr_info rv;
+
+ rv.msr_no = msr_no;
+ rv.l = l;
+ rv.h = h;
+ err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1);
+
+ return err;
+}
+
+/* rdmsr on a bunch of cpus
+ *
+ * @mask: which cpus
+ * @msr_no: which MSR
+ * @l: array of the lower 32-bit MSR values
+ * @h: array of the higher 32-bit MSR values
+ *
+ * Returns:
+ * 0 - success
+ * <0 - read failed on at least one CPU (latter in the mask)
+ */
+int rdmsr_on_cpus(const cpumask_t *mask, u32 msr_no, u32 *l, u32 *h)
+{
+ int cpu, tmp, err = 0;
+
+ int off = cpumask_first(mask);
+
+ for_each_cpu(cpu, mask) {
+ tmp = rdmsr_on_cpu(cpu, msr_no, l + (cpu - off),
+ h + (cpu - off));
+ if (tmp)
+ err = tmp;
+ }
+ return err;
+}
+
+/*
+ * wrmsr of a bunch of cpus
+ *
+ * @msr_no: which MSR
+ * @l: array of the lower 32-bit MSR values
+ * @h: array of the higher 32-bit MSR values
+ *
+ * Returns:
+ * 0 - success
+ * <0 - write failed on at least one CPU (latter in the mask)
+ */
+int wrmsr_on_cpus(const cpumask_t *mask, u32 msr_no, u32 *l, u32 *h)
+{
+ int cpu, tmp, err = 0;
+
+ int off = cpumask_first(mask);
+
+ for_each_cpu(cpu, mask) {
+ tmp = wrmsr_on_cpu(cpu, msr_no, *(l + (cpu - off)),
+ *(h + (cpu - off)));
+ if (tmp)
+ err = tmp;
+ }
+ return err;
+}
+
+/* These "safe" variants are slower and should be used when the target MSR
+ may not actually exist. */
+static void __rdmsr_safe_on_cpu(void *info)
+{
+ struct msr_info *rv = info;
+
+ rv->err = rdmsr_safe(rv->msr_no, &rv->l, &rv->h);
+}
+
+static void __wrmsr_safe_on_cpu(void *info)
+{
+ struct msr_info *rv = info;
+
+ rv->err = wrmsr_safe(rv->msr_no, rv->l, rv->h);
+}
+
+int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
+{
+ int err;
+ struct msr_info rv;
+
+ rv.msr_no = msr_no;
+ err = smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 1);
+ *l = rv.l;
+ *h = rv.h;
+
+ return err ? err : rv.err;
+}
+
+int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
+{
+ int err;
+ struct msr_info rv;
+
+ rv.msr_no = msr_no;
+ rv.l = l;
+ rv.h = h;
+ err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1);
+
+ return err ? err : rv.err;
+}
+
+EXPORT_SYMBOL(rdmsr_on_cpu);
+EXPORT_SYMBOL(wrmsr_on_cpu);
+EXPORT_SYMBOL(rdmsr_on_cpus);
+EXPORT_SYMBOL(wrmsr_on_cpus);
+EXPORT_SYMBOL(rdmsr_safe_on_cpu);
+EXPORT_SYMBOL(wrmsr_safe_on_cpu);
--
1.6.2.4
--
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