Release 4.14 arch/x86/lib/msr-smp.c

Directory: arch/x86/lib
// SPDX-License-Identifier: GPL-2.0
#include <linux/export.h>
#include <linux/preempt.h>
#include <linux/smp.h>
#include <asm/msr.h>



static void __rdmsr_on_cpu(void *info)
{
	struct msr_info *rv = info;
	struct msr *reg;
	int this_cpu = raw_smp_processor_id();

	if (rv->msrs)
		reg = per_cpu_ptr(rv->msrs, this_cpu);
	else
		reg = &rv->reg;

	rdmsr(rv->msr_no, reg->l, reg->h);
}

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Borislav Petkov 68 100.00% 1 100.00%
Total 68 100.00% 1 100.00%



static void __wrmsr_on_cpu(void *info)
{
	struct msr_info *rv = info;
	struct msr *reg;
	int this_cpu = raw_smp_processor_id();

	if (rv->msrs)
		reg = per_cpu_ptr(rv->msrs, this_cpu);
	else
		reg = &rv->reg;

	wrmsr(rv->msr_no, reg->l, reg->h);
}

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Borislav Petkov 68 100.00% 1 100.00%
Total 68 100.00% 1 100.00%



int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
{
	int err;
	struct msr_info rv;

	memset(&rv, 0, sizeof(rv));

	rv.msr_no = msr_no;
	err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1);
	*l = rv.reg.l;
	*h = rv.reg.h;

	return err;
}
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Borislav Petkov 81 100.00% 1 100.00%
Total 81 100.00% 1 100.00%


EXPORT_SYMBOL(rdmsr_on_cpu);



int rdmsrl_on_cpu(unsigned int cpu, u32 msr_no, u64 *q)
{
	int err;
	struct msr_info rv;

	memset(&rv, 0, sizeof(rv));

	rv.msr_no = msr_no;
	err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1);
	*q = rv.reg.q;

	return err;
}
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Jacob jun Pan 68 100.00% 1 100.00%
Total 68 100.00% 1 100.00%


EXPORT_SYMBOL(rdmsrl_on_cpu);



int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
{
	int err;
	struct msr_info rv;

	memset(&rv, 0, sizeof(rv));

	rv.msr_no = msr_no;
	rv.reg.l = l;
	rv.reg.h = h;
	err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1);

	return err;
}
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Borislav Petkov 77 100.00% 1 100.00%
Total 77 100.00% 1 100.00%


EXPORT_SYMBOL(wrmsr_on_cpu);



int wrmsrl_on_cpu(unsigned int cpu, u32 msr_no, u64 q)
{
	int err;
	struct msr_info rv;

	memset(&rv, 0, sizeof(rv));

	rv.msr_no = msr_no;
	rv.reg.q = q;

	err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1);

	return err;
}
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Jacob jun Pan 66 100.00% 1 100.00%
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EXPORT_SYMBOL(wrmsrl_on_cpu);



static void __rwmsr_on_cpus(const struct cpumask *mask, u32 msr_no,
			    struct msr *msrs,
			    void (*msr_func) (void *info))
{
	struct msr_info rv;
	int this_cpu;

	memset(&rv, 0, sizeof(rv));

	rv.msrs	  = msrs;
	rv.msr_no = msr_no;

	this_cpu = get_cpu();

	if (cpumask_test_cpu(this_cpu, mask))
		msr_func(&rv);

	smp_call_function_many(mask, msr_func, &rv, 1);
	put_cpu();
}

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Borislav Petkov 98 100.00% 1 100.00%
Total 98 100.00% 1 100.00%

/* rdmsr on a bunch of CPUs
 *
 * @mask:       which CPUs
 * @msr_no:     which MSR
 * @msrs:       array of MSR values
 *
 */


void rdmsr_on_cpus(const struct cpumask *mask, u32 msr_no, struct msr *msrs)
{
	__rwmsr_on_cpus(mask, msr_no, msrs, __rdmsr_on_cpu);
}
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Borislav Petkov 30 100.00% 1 100.00%
Total 30 100.00% 1 100.00%


EXPORT_SYMBOL(rdmsr_on_cpus);

/*
 * wrmsr on a bunch of CPUs
 *
 * @mask:       which CPUs
 * @msr_no:     which MSR
 * @msrs:       array of MSR values
 *
 */


void wrmsr_on_cpus(const struct cpumask *mask, u32 msr_no, struct msr *msrs)
{
	__rwmsr_on_cpus(mask, msr_no, msrs, __wrmsr_on_cpu);
}
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Borislav Petkov 30 100.00% 1 100.00%
Total 30 100.00% 1 100.00%


EXPORT_SYMBOL(wrmsr_on_cpus);

/* 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->reg.l, &rv->reg.h);
}

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Borislav Petkov 42 100.00% 1 100.00%
Total 42 100.00% 1 100.00%



static void __wrmsr_safe_on_cpu(void *info)
{
	struct msr_info *rv = info;

	rv->err = wrmsr_safe(rv->msr_no, rv->reg.l, rv->reg.h);
}

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Borislav Petkov 40 100.00% 1 100.00%
Total 40 100.00% 1 100.00%



int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
{
	int err;
	struct msr_info rv;

	memset(&rv, 0, sizeof(rv));

	rv.msr_no = msr_no;
	err = smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 1);
	*l = rv.reg.l;
	*h = rv.reg.h;

	return err ? err : rv.err;
}
Contributors
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Borislav Petkov 87 100.00% 1 100.00%
Total 87 100.00% 1 100.00%


EXPORT_SYMBOL(rdmsr_safe_on_cpu);



int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
{
	int err;
	struct msr_info rv;

	memset(&rv, 0, sizeof(rv));

	rv.msr_no = msr_no;
	rv.reg.l = l;
	rv.reg.h = h;
	err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1);

	return err ? err : rv.err;
}
Contributors
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Borislav Petkov 83 100.00% 1 100.00%
Total 83 100.00% 1 100.00%


EXPORT_SYMBOL(wrmsr_safe_on_cpu);



int wrmsrl_safe_on_cpu(unsigned int cpu, u32 msr_no, u64 q)
{
	int err;
	struct msr_info rv;

	memset(&rv, 0, sizeof(rv));

	rv.msr_no = msr_no;
	rv.reg.q = q;

	err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1);

	return err ? err : rv.err;
}
Contributors
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Jacob jun Pan 72 100.00% 1 100.00%
Total 72 100.00% 1 100.00%


EXPORT_SYMBOL(wrmsrl_safe_on_cpu);



int rdmsrl_safe_on_cpu(unsigned int cpu, u32 msr_no, u64 *q)
{
	int err;
	struct msr_info rv;

	memset(&rv, 0, sizeof(rv));

	rv.msr_no = msr_no;
	err = smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 1);
	*q = rv.reg.q;

	return err ? err : rv.err;
}
Contributors
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Jacob jun Pan 74 100.00% 1 100.00%
Total 74 100.00% 1 100.00%


EXPORT_SYMBOL(rdmsrl_safe_on_cpu);

/*
 * These variants are significantly slower, but allows control over
 * the entire 32-bit GPR set.
 */


static void __rdmsr_safe_regs_on_cpu(void *info)
{
	struct msr_regs_info *rv = info;

	rv->err = rdmsr_safe_regs(rv->regs);
}

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Borislav Petkov 28 100.00% 1 100.00%
Total 28 100.00% 1 100.00%



static void __wrmsr_safe_regs_on_cpu(void *info)
{
	struct msr_regs_info *rv = info;

	rv->err = wrmsr_safe_regs(rv->regs);
}

Contributors
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Borislav Petkov 28 100.00% 1 100.00%
Total 28 100.00% 1 100.00%



int rdmsr_safe_regs_on_cpu(unsigned int cpu, u32 *regs)
{
	int err;
	struct msr_regs_info rv;

	rv.regs   = regs;
	rv.err    = -EIO;
	err = smp_call_function_single(cpu, __rdmsr_safe_regs_on_cpu, &rv, 1);

	return err ? err : rv.err;
}
Contributors
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Borislav Petkov 56 100.00% 1 100.00%
Total 56 100.00% 1 100.00%


EXPORT_SYMBOL(rdmsr_safe_regs_on_cpu);



int wrmsr_safe_regs_on_cpu(unsigned int cpu, u32 *regs)
{
	int err;
	struct msr_regs_info rv;

	rv.regs = regs;
	rv.err  = -EIO;
	err = smp_call_function_single(cpu, __wrmsr_safe_regs_on_cpu, &rv, 1);

	return err ? err : rv.err;
}
Contributors
Person Tokens Prop Commits CommitProp
Borislav Petkov 56 100.00% 1 100.00%
Total 56 100.00% 1 100.00%


EXPORT_SYMBOL(wrmsr_safe_regs_on_cpu);
Overall Contributors
Person Tokens Prop Commits CommitProp
Borislav Petkov 927 75.43% 1 25.00%
Jacob jun Pan 300 24.41% 1 25.00%
Greg Kroah-Hartman 1 0.08% 1 25.00%
Paul Gortmaker 1 0.08% 1 25.00%
Total 1229 100.00% 4 100.00%
Directory: arch/x86/lib

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Total	68	100.00%	1	100.00%
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Release 4.14 arch/x86/lib/msr-smp.c

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