1 #include <linux/module.h>
2 #include <linux/preempt.h>
4 #define CREATE_TRACE_POINTS
5 #include <asm/msr-trace.h>
7 struct msr *msrs_alloc(void)
9 struct msr *msrs = NULL;
11 msrs = alloc_percpu(struct msr);
13 pr_warn("%s: error allocating msrs\n", __func__);
19 EXPORT_SYMBOL(msrs_alloc);
21 void msrs_free(struct msr *msrs)
25 EXPORT_SYMBOL(msrs_free);
28 * Read an MSR with error handling
31 * @m: value to read into
33 * It returns read data only on success, otherwise it doesn't change the output
37 int msr_read(u32 msr, struct msr *m)
42 err = rdmsrl_safe(msr, &val);
50 * Write an MSR with error handling
55 int msr_write(u32 msr, struct msr *m)
57 return wrmsrl_safe(msr, m->q);
60 static inline int __flip_bit(u32 msr, u8 bit, bool set)
68 err = msr_read(msr, &m);
81 err = msr_write(msr, &m1);
89 * Set @bit in a MSR @msr.
92 * < 0: An error was encountered.
93 * = 0: Bit was already set.
94 * > 0: Hardware accepted the MSR write.
96 int msr_set_bit(u32 msr, u8 bit)
98 return __flip_bit(msr, bit, true);
102 * Clear @bit in a MSR @msr.
105 * < 0: An error was encountered.
106 * = 0: Bit was already cleared.
107 * > 0: Hardware accepted the MSR write.
109 int msr_clear_bit(u32 msr, u8 bit)
111 return __flip_bit(msr, bit, false);
114 #ifdef CONFIG_TRACEPOINTS
115 void do_trace_write_msr(unsigned msr, u64 val, int failed)
117 trace_write_msr(msr, val, failed);
119 EXPORT_SYMBOL(do_trace_write_msr);
120 EXPORT_TRACEPOINT_SYMBOL(write_msr);
122 void do_trace_read_msr(unsigned msr, u64 val, int failed)
124 trace_read_msr(msr, val, failed);
126 EXPORT_SYMBOL(do_trace_read_msr);
127 EXPORT_TRACEPOINT_SYMBOL(read_msr);
129 void do_trace_rdpmc(unsigned counter, u64 val, int failed)
131 trace_rdpmc(counter, val, failed);
133 EXPORT_SYMBOL(do_trace_rdpmc);
134 EXPORT_TRACEPOINT_SYMBOL(rdpmc);