Release 4.14 arch/x86/lib/msr.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/export.h>
#include <linux/percpu.h>
#include <linux/preempt.h>
#include <asm/msr.h>

#define CREATE_TRACE_POINTS
#include <asm/msr-trace.h>



struct msr *msrs_alloc(void)
{
	struct msr *msrs = NULL;

	msrs = alloc_percpu(struct msr);
	if (!msrs) {
		pr_warn("%s: error allocating msrs\n", __func__);
		return NULL;
	}

	return msrs;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Borislav Petkov
44
100.00%
2
100.00%
Total
44
100.00%
2
100.00%


EXPORT_SYMBOL(msrs_alloc);



void msrs_free(struct msr *msrs)
{
	free_percpu(msrs);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Borislav Petkov
15
100.00%
1
100.00%
Total
15
100.00%
1
100.00%


EXPORT_SYMBOL(msrs_free);

/**
 * Read an MSR with error handling
 *
 * @msr: MSR to read
 * @m: value to read into
 *
 * It returns read data only on success, otherwise it doesn't change the output
 * argument @m.
 *
 */


int msr_read(u32 msr, struct msr *m)
{
	int err;
	u64 val;

	err = rdmsrl_safe(msr, &val);
	if (!err)
		m->q = val;

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Borislav Petkov
43
100.00%
1
100.00%
Total
43
100.00%
1
100.00%

/**
 * Write an MSR with error handling
 *
 * @msr: MSR to write
 * @m: value to write
 */


int msr_write(u32 msr, struct msr *m)
{
	return wrmsrl_safe(msr, m->q);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Borislav Petkov
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%



static inline int __flip_bit(u32 msr, u8 bit, bool set)
{
	struct msr m, m1;
	int err = -EINVAL;

	if (bit > 63)
		return err;

	err = msr_read(msr, &m);
	if (err)
		return err;

	m1 = m;
	if (set)
		m1.q |=  BIT_64(bit);
	else
		m1.q &= ~BIT_64(bit);

	if (m1.q == m.q)
		return 0;

	err = msr_write(msr, &m1);
	if (err)
		return err;

	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Borislav Petkov
114
99.13%
1
50.00%
Andres Freund
1
0.87%
1
50.00%
Total
115
100.00%
2
100.00%

/**
 * Set @bit in a MSR @msr.
 *
 * Retval:
 * < 0: An error was encountered.
 * = 0: Bit was already set.
 * > 0: Hardware accepted the MSR write.
 */


int msr_set_bit(u32 msr, u8 bit)
{
	return __flip_bit(msr, bit, true);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Borislav Petkov
21
100.00%
1
100.00%
Total
21
100.00%
1
100.00%

/**
 * Clear @bit in a MSR @msr.
 *
 * Retval:
 * < 0: An error was encountered.
 * = 0: Bit was already cleared.
 * > 0: Hardware accepted the MSR write.
 */


int msr_clear_bit(u32 msr, u8 bit)
{
	return __flip_bit(msr, bit, false);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Borislav Petkov
21
100.00%
1
100.00%
Total
21
100.00%
1
100.00%

#ifdef CONFIG_TRACEPOINTS


void do_trace_write_msr(unsigned int msr, u64 val, int failed)
{
	trace_write_msr(msr, val, failed);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
23
95.83%
1
50.00%
Borislav Petkov
1
4.17%
1
50.00%
Total
24
100.00%
2
100.00%


EXPORT_SYMBOL(do_trace_write_msr);

EXPORT_TRACEPOINT_SYMBOL(write_msr);



void do_trace_read_msr(unsigned int msr, u64 val, int failed)
{
	trace_read_msr(msr, val, failed);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
23
95.83%
1
50.00%
Borislav Petkov
1
4.17%
1
50.00%
Total
24
100.00%
2
100.00%


EXPORT_SYMBOL(do_trace_read_msr);

EXPORT_TRACEPOINT_SYMBOL(read_msr);



void do_trace_rdpmc(unsigned counter, u64 val, int failed)
{
	trace_rdpmc(counter, val, failed);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%


EXPORT_SYMBOL(do_trace_rdpmc);

EXPORT_TRACEPOINT_SYMBOL(rdpmc);

#endif
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Borislav Petkov
297
70.55%
3
37.50%
Andi Kleen
110
26.13%
1
12.50%
Alexey Dobriyan
8
1.90%
1
12.50%
Paul Gortmaker
4
0.95%
1
12.50%
Andres Freund
1
0.24%
1
12.50%
Greg Kroah-Hartman
1
0.24%
1
12.50%
Total
421
100.00%
8
100.00%
Directory: arch/x86/lib

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.