git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| b077ffb3 AD |
1 | #include <linux/module.h> |
| 2 | #include <linux/preempt.h> | |
| 3 | #include <linux/smp.h> | |
| 4 | #include <asm/msr.h> | |
| 5 | ||
| b077ffb3 AD |
6 | struct msr_info { |
| 7 | u32 msr_no; | |
| 6bc1096d | 8 | struct msr reg; |
| 4e9baad8 | 9 | int err; |
| b077ffb3 AD |
10 | }; |
| 11 | ||
| 12 | static void __rdmsr_on_cpu(void *info) | |
| 13 | { | |
| 14 | struct msr_info *rv = info; | |
| 15 | ||
| 6bc1096d | 16 | rdmsr(rv->msr_no, rv->reg.l, rv->reg.h); |
| b077ffb3 AD |
17 | } |
| 18 | ||
| bdd31461 | 19 | static void __wrmsr_on_cpu(void *info) |
| b077ffb3 | 20 | { |
| 4e9baad8 RM |
21 | struct msr_info *rv = info; |
| 22 | ||
| 6bc1096d | 23 | wrmsr(rv->msr_no, rv->reg.l, rv->reg.h); |
| 4e9baad8 RM |
24 | } |
| 25 | ||
| bdd31461 | 26 | int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h) |
| 4e9baad8 | 27 | { |
| bdd31461 | 28 | int err; |
| 5f1f935c AK |
29 | struct msr_info rv; |
| 30 | ||
| 31 | rv.msr_no = msr_no; | |
| bdd31461 | 32 | err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1); |
| 6bc1096d BP |
33 | *l = rv.reg.l; |
| 34 | *h = rv.reg.h; | |
| 5f1f935c | 35 | |
| 4e9baad8 | 36 | return err; |
| b077ffb3 AD |
37 | } |
| 38 | ||
| bdd31461 PA |
39 | int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h) |
| 40 | { | |
| 41 | int err; | |
| 42 | struct msr_info rv; | |
| 43 | ||
| 44 | rv.msr_no = msr_no; | |
| 6bc1096d BP |
45 | rv.reg.l = l; |
| 46 | rv.reg.h = h; | |
| bdd31461 PA |
47 | err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1); |
| 48 | ||
| 49 | return err; | |
| 50 | } | |
| 51 | ||
| 52 | /* These "safe" variants are slower and should be used when the target MSR | |
| 53 | may not actually exist. */ | |
| 54 | static void __rdmsr_safe_on_cpu(void *info) | |
| b077ffb3 AD |
55 | { |
| 56 | struct msr_info *rv = info; | |
| 57 | ||
| 6bc1096d | 58 | rv->err = rdmsr_safe(rv->msr_no, &rv->reg.l, &rv->reg.h); |
| b077ffb3 AD |
59 | } |
| 60 | ||
| 4e9baad8 | 61 | static void __wrmsr_safe_on_cpu(void *info) |
| b077ffb3 | 62 | { |
| 4e9baad8 RM |
63 | struct msr_info *rv = info; |
| 64 | ||
| 6bc1096d | 65 | rv->err = wrmsr_safe(rv->msr_no, rv->reg.l, rv->reg.h); |
| 4e9baad8 RM |
66 | } |
| 67 | ||
| bdd31461 | 68 | int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h) |
| 4e9baad8 | 69 | { |
| bdd31461 | 70 | int err; |
| 5f1f935c AK |
71 | struct msr_info rv; |
| 72 | ||
| 73 | rv.msr_no = msr_no; | |
| bdd31461 | 74 | err = smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 1); |
| 6bc1096d BP |
75 | *l = rv.reg.l; |
| 76 | *h = rv.reg.h; | |
| 4e9baad8 | 77 | |
| bdd31461 | 78 | return err ? err : rv.err; |
| 4e9baad8 RM |
79 | } |
| 80 | ||
| 4e9baad8 RM |
81 | int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h) |
| 82 | { | |
| bdd31461 PA |
83 | int err; |
| 84 | struct msr_info rv; | |
| 4e9baad8 | 85 | |
| bdd31461 | 86 | rv.msr_no = msr_no; |
| 6bc1096d BP |
87 | rv.reg.l = l; |
| 88 | rv.reg.h = h; | |
| bdd31461 PA |
89 | err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1); |
| 90 | ||
| 91 | return err ? err : rv.err; | |
| b077ffb3 | 92 | } |
| b077ffb3 AD |
93 | |
| 94 | EXPORT_SYMBOL(rdmsr_on_cpu); | |
| 95 | EXPORT_SYMBOL(wrmsr_on_cpu); | |
| 4e9baad8 RM |
96 | EXPORT_SYMBOL(rdmsr_safe_on_cpu); |
| 97 | EXPORT_SYMBOL(wrmsr_safe_on_cpu); |