diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/i386/kernel/msr.c | 106 | ||||
| -rw-r--r-- | arch/i386/lib/msr-on-cpu.c | 73 |
2 files changed, 71 insertions, 108 deletions
diff --git a/arch/i386/kernel/msr.c b/arch/i386/kernel/msr.c index bcaa6e9b6197..8cd0a91ce107 100644 --- a/arch/i386/kernel/msr.c +++ b/arch/i386/kernel/msr.c @@ -45,104 +45,6 @@ static struct class *msr_class; -static inline int wrmsr_eio(u32 reg, u32 eax, u32 edx) -{ - int err; - - err = wrmsr_safe(reg, eax, edx); - if (err) - err = -EIO; - return err; -} - -static inline int rdmsr_eio(u32 reg, u32 *eax, u32 *edx) -{ - int err; - - err = rdmsr_safe(reg, eax, edx); - if (err) - err = -EIO; - return err; -} - -#ifdef CONFIG_SMP - -struct msr_command { - int err; - u32 reg; - u32 data[2]; -}; - -static void msr_smp_wrmsr(void *cmd_block) -{ - struct msr_command *cmd = (struct msr_command *)cmd_block; - - cmd->err = wrmsr_eio(cmd->reg, cmd->data[0], cmd->data[1]); -} - -static void msr_smp_rdmsr(void *cmd_block) -{ - struct msr_command *cmd = (struct msr_command *)cmd_block; - - cmd->err = rdmsr_eio(cmd->reg, &cmd->data[0], &cmd->data[1]); -} - -static inline int do_wrmsr(int cpu, u32 reg, u32 eax, u32 edx) -{ - struct msr_command cmd; - int ret; - - preempt_disable(); - if (cpu == smp_processor_id()) { - ret = wrmsr_eio(reg, eax, edx); - } else { - cmd.reg = reg; - cmd.data[0] = eax; - cmd.data[1] = edx; - - smp_call_function_single(cpu, msr_smp_wrmsr, &cmd, 1, 1); - ret = cmd.err; - } - preempt_enable(); - return ret; -} - -static inline int do_rdmsr(int cpu, u32 reg, u32 * eax, u32 * edx) -{ - struct msr_command cmd; - int ret; - - preempt_disable(); - if (cpu == smp_processor_id()) { - ret = rdmsr_eio(reg, eax, edx); - } else { - cmd.reg = reg; - - smp_call_function_single(cpu, msr_smp_rdmsr, &cmd, 1, 1); - - *eax = cmd.data[0]; - *edx = cmd.data[1]; - - ret = cmd.err; - } - preempt_enable(); - return ret; -} - -#else /* ! CONFIG_SMP */ - -static inline int do_wrmsr(int cpu, u32 reg, u32 eax, u32 edx) -{ - return wrmsr_eio(reg, eax, edx); -} - -static inline int do_rdmsr(int cpu, u32 reg, u32 *eax, u32 *edx) -{ - return rdmsr_eio(reg, eax, edx); -} - -#endif /* ! CONFIG_SMP */ - static loff_t msr_seek(struct file *file, loff_t offset, int orig) { loff_t ret = -EINVAL; @@ -174,9 +76,9 @@ static ssize_t msr_read(struct file *file, char __user * buf, return -EINVAL; /* Invalid chunk size */ for (; count; count -= 8) { - err = do_rdmsr(cpu, reg, &data[0], &data[1]); + err = rdmsr_safe_on_cpu(cpu, reg, &data[0], &data[1]); if (err) - return err; + return -EIO; if (copy_to_user(tmp, &data, 8)) return -EFAULT; tmp += 2; @@ -200,9 +102,9 @@ static ssize_t msr_write(struct file *file, const char __user *buf, for (; count; count -= 8) { if (copy_from_user(&data, tmp, 8)) return -EFAULT; - err = do_wrmsr(cpu, reg, data[0], data[1]); + err = wrmsr_safe_on_cpu(cpu, reg, data[0], data[1]); if (err) - return err; + return -EIO; tmp += 2; } diff --git a/arch/i386/lib/msr-on-cpu.c b/arch/i386/lib/msr-on-cpu.c index 1c46bda409ff..7767962f25d3 100644 --- a/arch/i386/lib/msr-on-cpu.c +++ b/arch/i386/lib/msr-on-cpu.c @@ -6,6 +6,7 @@ struct msr_info { u32 msr_no; u32 l, h; + int err; }; static void __rdmsr_on_cpu(void *info) @@ -15,20 +16,38 @@ static void __rdmsr_on_cpu(void *info) rdmsr(rv->msr_no, rv->l, rv->h); } -void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h) +static void __rdmsr_safe_on_cpu(void *info) { + struct msr_info *rv = info; + + rv->err = rdmsr_safe(rv->msr_no, &rv->l, &rv->h); +} + +static int _rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h, int safe) +{ + int err = 0; preempt_disable(); if (smp_processor_id() == cpu) - rdmsr(msr_no, *l, *h); + if (safe) + err = rdmsr_safe(msr_no, l, h); + else + rdmsr(msr_no, *l, *h); else { struct msr_info rv; rv.msr_no = msr_no; - smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 0, 1); + if (safe) { + smp_call_function_single(cpu, __rdmsr_safe_on_cpu, + &rv, 0, 1); + err = rv.err; + } else { + smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 0, 1); + } *l = rv.l; *h = rv.h; } preempt_enable(); + return err; } static void __wrmsr_on_cpu(void *info) @@ -38,21 +57,63 @@ static void __wrmsr_on_cpu(void *info) wrmsr(rv->msr_no, rv->l, rv->h); } -void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h) +static void __wrmsr_safe_on_cpu(void *info) { + struct msr_info *rv = info; + + rv->err = wrmsr_safe(rv->msr_no, rv->l, rv->h); +} + +static int _wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h, int safe) +{ + int err = 0; preempt_disable(); if (smp_processor_id() == cpu) - wrmsr(msr_no, l, h); + if (safe) + err = wrmsr_safe(msr_no, l, h); + else + wrmsr(msr_no, l, h); else { struct msr_info rv; rv.msr_no = msr_no; rv.l = l; rv.h = h; - smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 0, 1); + if (safe) { + smp_call_function_single(cpu, __wrmsr_safe_on_cpu, + &rv, 0, 1); + err = rv.err; + } else { + smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 0, 1); + } } preempt_enable(); + return err; +} + +void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h) +{ + _wrmsr_on_cpu(cpu, msr_no, l, h, 0); +} + +void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h) +{ + _rdmsr_on_cpu(cpu, msr_no, l, h, 0); +} + +/* These "safe" variants are slower and should be used when the target MSR + may not actually exist. */ +int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h) +{ + return _wrmsr_on_cpu(cpu, msr_no, l, h, 1); +} + +int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h) +{ + return _rdmsr_on_cpu(cpu, msr_no, l, h, 1); } EXPORT_SYMBOL(rdmsr_on_cpu); EXPORT_SYMBOL(wrmsr_on_cpu); +EXPORT_SYMBOL(rdmsr_safe_on_cpu); +EXPORT_SYMBOL(wrmsr_safe_on_cpu); |