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279 lines
5.3 KiB
279 lines
5.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/export.h> |
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#include <linux/preempt.h> |
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#include <linux/smp.h> |
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#include <linux/completion.h> |
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#include <asm/msr.h> |
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static void __rdmsr_on_cpu(void *info) |
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{ |
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struct msr_info *rv = info; |
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struct msr *reg; |
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int this_cpu = raw_smp_processor_id(); |
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if (rv->msrs) |
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reg = per_cpu_ptr(rv->msrs, this_cpu); |
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else |
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reg = &rv->reg; |
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rdmsr(rv->msr_no, reg->l, reg->h); |
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} |
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static void __wrmsr_on_cpu(void *info) |
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{ |
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struct msr_info *rv = info; |
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struct msr *reg; |
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int this_cpu = raw_smp_processor_id(); |
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if (rv->msrs) |
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reg = per_cpu_ptr(rv->msrs, this_cpu); |
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else |
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reg = &rv->reg; |
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wrmsr(rv->msr_no, reg->l, reg->h); |
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} |
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int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h) |
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{ |
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int err; |
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struct msr_info rv; |
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memset(&rv, 0, sizeof(rv)); |
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rv.msr_no = msr_no; |
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err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1); |
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*l = rv.reg.l; |
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*h = rv.reg.h; |
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return err; |
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} |
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EXPORT_SYMBOL(rdmsr_on_cpu); |
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int rdmsrl_on_cpu(unsigned int cpu, u32 msr_no, u64 *q) |
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{ |
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int err; |
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struct msr_info rv; |
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memset(&rv, 0, sizeof(rv)); |
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rv.msr_no = msr_no; |
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err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1); |
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*q = rv.reg.q; |
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return err; |
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} |
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EXPORT_SYMBOL(rdmsrl_on_cpu); |
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int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h) |
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{ |
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int err; |
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struct msr_info rv; |
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memset(&rv, 0, sizeof(rv)); |
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rv.msr_no = msr_no; |
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rv.reg.l = l; |
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rv.reg.h = h; |
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err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1); |
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return err; |
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} |
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EXPORT_SYMBOL(wrmsr_on_cpu); |
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int wrmsrl_on_cpu(unsigned int cpu, u32 msr_no, u64 q) |
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{ |
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int err; |
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struct msr_info rv; |
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memset(&rv, 0, sizeof(rv)); |
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rv.msr_no = msr_no; |
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rv.reg.q = q; |
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err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1); |
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return err; |
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} |
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EXPORT_SYMBOL(wrmsrl_on_cpu); |
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static void __rwmsr_on_cpus(const struct cpumask *mask, u32 msr_no, |
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struct msr *msrs, |
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void (*msr_func) (void *info)) |
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{ |
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struct msr_info rv; |
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int this_cpu; |
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memset(&rv, 0, sizeof(rv)); |
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rv.msrs = msrs; |
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rv.msr_no = msr_no; |
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this_cpu = get_cpu(); |
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if (cpumask_test_cpu(this_cpu, mask)) |
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msr_func(&rv); |
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smp_call_function_many(mask, msr_func, &rv, 1); |
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put_cpu(); |
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} |
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/* rdmsr on a bunch of CPUs |
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* |
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* @mask: which CPUs |
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* @msr_no: which MSR |
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* @msrs: array of MSR values |
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* |
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*/ |
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void rdmsr_on_cpus(const struct cpumask *mask, u32 msr_no, struct msr *msrs) |
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{ |
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__rwmsr_on_cpus(mask, msr_no, msrs, __rdmsr_on_cpu); |
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} |
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EXPORT_SYMBOL(rdmsr_on_cpus); |
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/* |
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* wrmsr on a bunch of CPUs |
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* |
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* @mask: which CPUs |
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* @msr_no: which MSR |
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* @msrs: array of MSR values |
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* |
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*/ |
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void wrmsr_on_cpus(const struct cpumask *mask, u32 msr_no, struct msr *msrs) |
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{ |
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__rwmsr_on_cpus(mask, msr_no, msrs, __wrmsr_on_cpu); |
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} |
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EXPORT_SYMBOL(wrmsr_on_cpus); |
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struct msr_info_completion { |
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struct msr_info msr; |
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struct completion done; |
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}; |
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/* These "safe" variants are slower and should be used when the target MSR |
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may not actually exist. */ |
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static void __rdmsr_safe_on_cpu(void *info) |
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{ |
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struct msr_info_completion *rv = info; |
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rv->msr.err = rdmsr_safe(rv->msr.msr_no, &rv->msr.reg.l, &rv->msr.reg.h); |
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complete(&rv->done); |
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} |
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static void __wrmsr_safe_on_cpu(void *info) |
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{ |
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struct msr_info *rv = info; |
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rv->err = wrmsr_safe(rv->msr_no, rv->reg.l, rv->reg.h); |
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} |
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int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h) |
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{ |
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struct msr_info_completion rv; |
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call_single_data_t csd; |
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int err; |
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INIT_CSD(&csd, __rdmsr_safe_on_cpu, &rv); |
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memset(&rv, 0, sizeof(rv)); |
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init_completion(&rv.done); |
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rv.msr.msr_no = msr_no; |
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err = smp_call_function_single_async(cpu, &csd); |
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if (!err) { |
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wait_for_completion(&rv.done); |
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err = rv.msr.err; |
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} |
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*l = rv.msr.reg.l; |
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*h = rv.msr.reg.h; |
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return err; |
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} |
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EXPORT_SYMBOL(rdmsr_safe_on_cpu); |
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int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h) |
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{ |
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int err; |
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struct msr_info rv; |
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memset(&rv, 0, sizeof(rv)); |
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rv.msr_no = msr_no; |
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rv.reg.l = l; |
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rv.reg.h = h; |
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err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1); |
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return err ? err : rv.err; |
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} |
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EXPORT_SYMBOL(wrmsr_safe_on_cpu); |
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int wrmsrl_safe_on_cpu(unsigned int cpu, u32 msr_no, u64 q) |
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{ |
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int err; |
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struct msr_info rv; |
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memset(&rv, 0, sizeof(rv)); |
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rv.msr_no = msr_no; |
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rv.reg.q = q; |
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err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1); |
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return err ? err : rv.err; |
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} |
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EXPORT_SYMBOL(wrmsrl_safe_on_cpu); |
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int rdmsrl_safe_on_cpu(unsigned int cpu, u32 msr_no, u64 *q) |
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{ |
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u32 low, high; |
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int err; |
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err = rdmsr_safe_on_cpu(cpu, msr_no, &low, &high); |
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*q = (u64)high << 32 | low; |
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return err; |
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} |
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EXPORT_SYMBOL(rdmsrl_safe_on_cpu); |
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/* |
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* These variants are significantly slower, but allows control over |
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* the entire 32-bit GPR set. |
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*/ |
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static void __rdmsr_safe_regs_on_cpu(void *info) |
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{ |
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struct msr_regs_info *rv = info; |
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rv->err = rdmsr_safe_regs(rv->regs); |
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} |
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static void __wrmsr_safe_regs_on_cpu(void *info) |
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{ |
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struct msr_regs_info *rv = info; |
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rv->err = wrmsr_safe_regs(rv->regs); |
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} |
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int rdmsr_safe_regs_on_cpu(unsigned int cpu, u32 regs[8]) |
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{ |
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int err; |
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struct msr_regs_info rv; |
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rv.regs = regs; |
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rv.err = -EIO; |
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err = smp_call_function_single(cpu, __rdmsr_safe_regs_on_cpu, &rv, 1); |
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return err ? err : rv.err; |
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} |
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EXPORT_SYMBOL(rdmsr_safe_regs_on_cpu); |
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int wrmsr_safe_regs_on_cpu(unsigned int cpu, u32 regs[8]) |
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{ |
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int err; |
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struct msr_regs_info rv; |
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rv.regs = regs; |
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rv.err = -EIO; |
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err = smp_call_function_single(cpu, __wrmsr_safe_regs_on_cpu, &rv, 1); |
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return err ? err : rv.err; |
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} |
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EXPORT_SYMBOL(wrmsr_safe_regs_on_cpu);
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