mirror of https://gitee.com/openkylin/linux.git
137 lines
2.2 KiB
C
137 lines
2.2 KiB
C
#include <linux/module.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;
|
|
}
|
|
EXPORT_SYMBOL(msrs_alloc);
|
|
|
|
void msrs_free(struct msr *msrs)
|
|
{
|
|
free_percpu(msrs);
|
|
}
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
#ifdef CONFIG_TRACEPOINTS
|
|
void do_trace_write_msr(unsigned msr, u64 val, int failed)
|
|
{
|
|
trace_write_msr(msr, val, failed);
|
|
}
|
|
EXPORT_SYMBOL(do_trace_write_msr);
|
|
EXPORT_TRACEPOINT_SYMBOL(write_msr);
|
|
|
|
void do_trace_read_msr(unsigned msr, u64 val, int failed)
|
|
{
|
|
trace_read_msr(msr, val, failed);
|
|
}
|
|
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);
|
|
}
|
|
EXPORT_SYMBOL(do_trace_rdpmc);
|
|
EXPORT_TRACEPOINT_SYMBOL(rdpmc);
|
|
|
|
#endif
|