1
2#include <linux/export.h>
3#include <linux/preempt.h>
4#include <linux/smp.h>
5#include <linux/completion.h>
6#include <asm/msr.h>
7
8static void __rdmsr_on_cpu(void *info)
9{
10 struct msr_info *rv = info;
11 struct msr *reg;
12 int this_cpu = raw_smp_processor_id();
13
14 if (rv->msrs)
15 reg = per_cpu_ptr(rv->msrs, this_cpu);
16 else
17 reg = &rv->reg;
18
19 rdmsr(rv->msr_no, reg->l, reg->h);
20}
21
22static void __wrmsr_on_cpu(void *info)
23{
24 struct msr_info *rv = info;
25 struct msr *reg;
26 int this_cpu = raw_smp_processor_id();
27
28 if (rv->msrs)
29 reg = per_cpu_ptr(rv->msrs, this_cpu);
30 else
31 reg = &rv->reg;
32
33 wrmsr(rv->msr_no, reg->l, reg->h);
34}
35
36int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
37{
38 int err;
39 struct msr_info rv;
40
41 memset(&rv, 0, sizeof(rv));
42
43 rv.msr_no = msr_no;
44 err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1);
45 *l = rv.reg.l;
46 *h = rv.reg.h;
47
48 return err;
49}
50EXPORT_SYMBOL(rdmsr_on_cpu);
51
52int rdmsrl_on_cpu(unsigned int cpu, u32 msr_no, u64 *q)
53{
54 int err;
55 struct msr_info rv;
56
57 memset(&rv, 0, sizeof(rv));
58
59 rv.msr_no = msr_no;
60 err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1);
61 *q = rv.reg.q;
62
63 return err;
64}
65EXPORT_SYMBOL(rdmsrl_on_cpu);
66
67int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
68{
69 int err;
70 struct msr_info rv;
71
72 memset(&rv, 0, sizeof(rv));
73
74 rv.msr_no = msr_no;
75 rv.reg.l = l;
76 rv.reg.h = h;
77 err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1);
78
79 return err;
80}
81EXPORT_SYMBOL(wrmsr_on_cpu);
82
83int wrmsrl_on_cpu(unsigned int cpu, u32 msr_no, u64 q)
84{
85 int err;
86 struct msr_info rv;
87
88 memset(&rv, 0, sizeof(rv));
89
90 rv.msr_no = msr_no;
91 rv.reg.q = q;
92
93 err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1);
94
95 return err;
96}
97EXPORT_SYMBOL(wrmsrl_on_cpu);
98
99static void __rwmsr_on_cpus(const struct cpumask *mask, u32 msr_no,
100 struct msr *msrs,
101 void (*msr_func) (void *info))
102{
103 struct msr_info rv;
104 int this_cpu;
105
106 memset(&rv, 0, sizeof(rv));
107
108 rv.msrs = msrs;
109 rv.msr_no = msr_no;
110
111 this_cpu = get_cpu();
112
113 if (cpumask_test_cpu(this_cpu, mask))
114 msr_func(&rv);
115
116 smp_call_function_many(mask, msr_func, &rv, 1);
117 put_cpu();
118}
119
120
121
122
123
124
125
126
127void rdmsr_on_cpus(const struct cpumask *mask, u32 msr_no, struct msr *msrs)
128{
129 __rwmsr_on_cpus(mask, msr_no, msrs, __rdmsr_on_cpu);
130}
131EXPORT_SYMBOL(rdmsr_on_cpus);
132
133
134
135
136
137
138
139
140
141void wrmsr_on_cpus(const struct cpumask *mask, u32 msr_no, struct msr *msrs)
142{
143 __rwmsr_on_cpus(mask, msr_no, msrs, __wrmsr_on_cpu);
144}
145EXPORT_SYMBOL(wrmsr_on_cpus);
146
147struct msr_info_completion {
148 struct msr_info msr;
149 struct completion done;
150};
151
152
153
154static void __rdmsr_safe_on_cpu(void *info)
155{
156 struct msr_info_completion *rv = info;
157
158 rv->msr.err = rdmsr_safe(rv->msr.msr_no, &rv->msr.reg.l, &rv->msr.reg.h);
159 complete(&rv->done);
160}
161
162static void __wrmsr_safe_on_cpu(void *info)
163{
164 struct msr_info *rv = info;
165
166 rv->err = wrmsr_safe(rv->msr_no, rv->reg.l, rv->reg.h);
167}
168
169int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
170{
171 struct msr_info_completion rv;
172 call_single_data_t csd = {
173 .func = __rdmsr_safe_on_cpu,
174 .info = &rv,
175 };
176 int err;
177
178 memset(&rv, 0, sizeof(rv));
179 init_completion(&rv.done);
180 rv.msr.msr_no = msr_no;
181
182 err = smp_call_function_single_async(cpu, &csd);
183 if (!err) {
184 wait_for_completion(&rv.done);
185 err = rv.msr.err;
186 }
187 *l = rv.msr.reg.l;
188 *h = rv.msr.reg.h;
189
190 return err;
191}
192EXPORT_SYMBOL(rdmsr_safe_on_cpu);
193
194int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
195{
196 int err;
197 struct msr_info rv;
198
199 memset(&rv, 0, sizeof(rv));
200
201 rv.msr_no = msr_no;
202 rv.reg.l = l;
203 rv.reg.h = h;
204 err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1);
205
206 return err ? err : rv.err;
207}
208EXPORT_SYMBOL(wrmsr_safe_on_cpu);
209
210int wrmsrl_safe_on_cpu(unsigned int cpu, u32 msr_no, u64 q)
211{
212 int err;
213 struct msr_info rv;
214
215 memset(&rv, 0, sizeof(rv));
216
217 rv.msr_no = msr_no;
218 rv.reg.q = q;
219
220 err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1);
221
222 return err ? err : rv.err;
223}
224EXPORT_SYMBOL(wrmsrl_safe_on_cpu);
225
226int rdmsrl_safe_on_cpu(unsigned int cpu, u32 msr_no, u64 *q)
227{
228 u32 low, high;
229 int err;
230
231 err = rdmsr_safe_on_cpu(cpu, msr_no, &low, &high);
232 *q = (u64)high << 32 | low;
233
234 return err;
235}
236EXPORT_SYMBOL(rdmsrl_safe_on_cpu);
237
238
239
240
241
242static void __rdmsr_safe_regs_on_cpu(void *info)
243{
244 struct msr_regs_info *rv = info;
245
246 rv->err = rdmsr_safe_regs(rv->regs);
247}
248
249static void __wrmsr_safe_regs_on_cpu(void *info)
250{
251 struct msr_regs_info *rv = info;
252
253 rv->err = wrmsr_safe_regs(rv->regs);
254}
255
256int rdmsr_safe_regs_on_cpu(unsigned int cpu, u32 *regs)
257{
258 int err;
259 struct msr_regs_info rv;
260
261 rv.regs = regs;
262 rv.err = -EIO;
263 err = smp_call_function_single(cpu, __rdmsr_safe_regs_on_cpu, &rv, 1);
264
265 return err ? err : rv.err;
266}
267EXPORT_SYMBOL(rdmsr_safe_regs_on_cpu);
268
269int wrmsr_safe_regs_on_cpu(unsigned int cpu, u32 *regs)
270{
271 int err;
272 struct msr_regs_info rv;
273
274 rv.regs = regs;
275 rv.err = -EIO;
276 err = smp_call_function_single(cpu, __wrmsr_safe_regs_on_cpu, &rv, 1);
277
278 return err ? err : rv.err;
279}
280EXPORT_SYMBOL(wrmsr_safe_regs_on_cpu);
281
