1#include <linux/module.h>
2#include <linux/preempt.h>
3#include <linux/smp.h>
4#include <asm/msr.h>
5
6static void __rdmsr_on_cpu(void *info)
7{
8 struct msr_info *rv = info;
9 struct msr *reg;
10 int this_cpu = raw_smp_processor_id();
11
12 if (rv->msrs)
13 reg = per_cpu_ptr(rv->msrs, this_cpu);
14 else
15 reg = &rv->reg;
16
17 rdmsr(rv->msr_no, reg->l, reg->h);
18}
19
20static void __wrmsr_on_cpu(void *info)
21{
22 struct msr_info *rv = info;
23 struct msr *reg;
24 int this_cpu = raw_smp_processor_id();
25
26 if (rv->msrs)
27 reg = per_cpu_ptr(rv->msrs, this_cpu);
28 else
29 reg = &rv->reg;
30
31 wrmsr(rv->msr_no, reg->l, reg->h);
32}
33
34int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
35{
36 int err;
37 struct msr_info rv;
38
39 memset(&rv, 0, sizeof(rv));
40
41 rv.msr_no = msr_no;
42 err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1);
43 *l = rv.reg.l;
44 *h = rv.reg.h;
45
46 return err;
47}
48EXPORT_SYMBOL(rdmsr_on_cpu);
49
50int rdmsrl_on_cpu(unsigned int cpu, u32 msr_no, u64 *q)
51{
52 int err;
53 struct msr_info rv;
54
55 memset(&rv, 0, sizeof(rv));
56
57 rv.msr_no = msr_no;
58 err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1);
59 *q = rv.reg.q;
60
61 return err;
62}
63EXPORT_SYMBOL(rdmsrl_on_cpu);
64
65int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
66{
67 int err;
68 struct msr_info rv;
69
70 memset(&rv, 0, sizeof(rv));
71
72 rv.msr_no = msr_no;
73 rv.reg.l = l;
74 rv.reg.h = h;
75 err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1);
76
77 return err;
78}
79EXPORT_SYMBOL(wrmsr_on_cpu);
80
81int wrmsrl_on_cpu(unsigned int cpu, u32 msr_no, u64 q)
82{
83 int err;
84 struct msr_info rv;
85
86 memset(&rv, 0, sizeof(rv));
87
88 rv.msr_no = msr_no;
89 rv.reg.q = q;
90
91 err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1);
92
93 return err;
94}
95EXPORT_SYMBOL(wrmsrl_on_cpu);
96
97static void __rwmsr_on_cpus(const struct cpumask *mask, u32 msr_no,
98 struct msr *msrs,
99 void (*msr_func) (void *info))
100{
101 struct msr_info rv;
102 int this_cpu;
103
104 memset(&rv, 0, sizeof(rv));
105
106 rv.msrs = msrs;
107 rv.msr_no = msr_no;
108
109 this_cpu = get_cpu();
110
111 if (cpumask_test_cpu(this_cpu, mask))
112 msr_func(&rv);
113
114 smp_call_function_many(mask, msr_func, &rv, 1);
115 put_cpu();
116}
117
118
119
120
121
122
123
124
125void rdmsr_on_cpus(const struct cpumask *mask, u32 msr_no, struct msr *msrs)
126{
127 __rwmsr_on_cpus(mask, msr_no, msrs, __rdmsr_on_cpu);
128}
129EXPORT_SYMBOL(rdmsr_on_cpus);
130
131
132
133
134
135
136
137
138
139void wrmsr_on_cpus(const struct cpumask *mask, u32 msr_no, struct msr *msrs)
140{
141 __rwmsr_on_cpus(mask, msr_no, msrs, __wrmsr_on_cpu);
142}
143EXPORT_SYMBOL(wrmsr_on_cpus);
144
145
146
147static void __rdmsr_safe_on_cpu(void *info)
148{
149 struct msr_info *rv = info;
150
151 rv->err = rdmsr_safe(rv->msr_no, &rv->reg.l, &rv->reg.h);
152}
153
154static void __wrmsr_safe_on_cpu(void *info)
155{
156 struct msr_info *rv = info;
157
158 rv->err = wrmsr_safe(rv->msr_no, rv->reg.l, rv->reg.h);
159}
160
161int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
162{
163 int err;
164 struct msr_info rv;
165
166 memset(&rv, 0, sizeof(rv));
167
168 rv.msr_no = msr_no;
169 err = smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 1);
170 *l = rv.reg.l;
171 *h = rv.reg.h;
172
173 return err ? err : rv.err;
174}
175EXPORT_SYMBOL(rdmsr_safe_on_cpu);
176
177int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
178{
179 int err;
180 struct msr_info rv;
181
182 memset(&rv, 0, sizeof(rv));
183
184 rv.msr_no = msr_no;
185 rv.reg.l = l;
186 rv.reg.h = h;
187 err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1);
188
189 return err ? err : rv.err;
190}
191EXPORT_SYMBOL(wrmsr_safe_on_cpu);
192
193int wrmsrl_safe_on_cpu(unsigned int cpu, u32 msr_no, u64 q)
194{
195 int err;
196 struct msr_info rv;
197
198 memset(&rv, 0, sizeof(rv));
199
200 rv.msr_no = msr_no;
201 rv.reg.q = q;
202
203 err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1);
204
205 return err ? err : rv.err;
206}
207EXPORT_SYMBOL(wrmsrl_safe_on_cpu);
208
209int rdmsrl_safe_on_cpu(unsigned int cpu, u32 msr_no, u64 *q)
210{
211 int err;
212 struct msr_info rv;
213
214 memset(&rv, 0, sizeof(rv));
215
216 rv.msr_no = msr_no;
217 err = smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 1);
218 *q = rv.reg.q;
219
220 return err ? err : rv.err;
221}
222EXPORT_SYMBOL(rdmsrl_safe_on_cpu);
223
224
225
226
227
228static void __rdmsr_safe_regs_on_cpu(void *info)
229{
230 struct msr_regs_info *rv = info;
231
232 rv->err = rdmsr_safe_regs(rv->regs);
233}
234
235static void __wrmsr_safe_regs_on_cpu(void *info)
236{
237 struct msr_regs_info *rv = info;
238
239 rv->err = wrmsr_safe_regs(rv->regs);
240}
241
242int rdmsr_safe_regs_on_cpu(unsigned int cpu, u32 *regs)
243{
244 int err;
245 struct msr_regs_info rv;
246
247 rv.regs = regs;
248 rv.err = -EIO;
249 err = smp_call_function_single(cpu, __rdmsr_safe_regs_on_cpu, &rv, 1);
250
251 return err ? err : rv.err;
252}
253EXPORT_SYMBOL(rdmsr_safe_regs_on_cpu);
254
255int wrmsr_safe_regs_on_cpu(unsigned int cpu, u32 *regs)
256{
257 int err;
258 struct msr_regs_info rv;
259
260 rv.regs = regs;
261 rv.err = -EIO;
262 err = smp_call_function_single(cpu, __wrmsr_safe_regs_on_cpu, &rv, 1);
263
264 return err ? err : rv.err;
265}
266EXPORT_SYMBOL(wrmsr_safe_regs_on_cpu);
267
