forked from Minki/linux
x86, msr: msrs_alloc/free for CONFIG_SMP=n
Randy Dunlap reported the following build error:
"When CONFIG_SMP=n, CONFIG_X86_MSR=m:
ERROR: "msrs_free" [drivers/edac/amd64_edac_mod.ko] undefined!
ERROR: "msrs_alloc" [drivers/edac/amd64_edac_mod.ko] undefined!"
This is due to the fact that <arch/x86/lib/msr.c> is conditioned on
CONFIG_SMP and in the UP case we have only the stubs in the header.
Fork off SMP functionality into a new file (msr-smp.c) and build
msrs_{alloc,free} unconditionally.
Reported-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
LKML-Reference: <20091216231625.GD27228@liondog.tnic>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Borislav Petkov
H. Peter Anvin
parent
9d260ebc09
commit
6ede31e030
@ -27,6 +27,18 @@ struct msr {
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};
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};
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struct msr_info {
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u32 msr_no;
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struct msr reg;
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struct msr *msrs;
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int err;
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};
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struct msr_regs_info {
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u32 *regs;
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int err;
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};
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static inline unsigned long long native_read_tscp(unsigned int *aux)
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{
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unsigned long low, high;
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@ -14,7 +14,7 @@ $(obj)/inat.o: $(obj)/inat-tables.c
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clean-files := inat-tables.c
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obj-$(CONFIG_SMP) := msr.o
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obj-$(CONFIG_SMP) += msr-smp.o
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lib-y := delay.o
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lib-y += thunk_$(BITS).o
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@ -22,7 +22,7 @@ lib-y += usercopy_$(BITS).o getuser.o putuser.o
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lib-y += memcpy_$(BITS).o
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lib-y += insn.o inat.o
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obj-y += msr-reg.o msr-reg-export.o
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obj-y += msr.o msr-reg.o msr-reg-export.o
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ifeq ($(CONFIG_X86_32),y)
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obj-y += atomic64_32.o
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204
arch/x86/lib/msr-smp.c
Normal file
204
arch/x86/lib/msr-smp.c
Normal file
@ -0,0 +1,204 @@
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#include <linux/module.h>
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#include <linux/preempt.h>
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#include <linux/smp.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 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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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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/* 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 *rv = info;
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rv->err = rdmsr_safe(rv->msr_no, &rv->reg.l, &rv->reg.h);
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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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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_safe_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 ? err : rv.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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/*
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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)
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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)
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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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@ -1,123 +1,7 @@
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#include <linux/module.h>
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#include <linux/preempt.h>
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#include <linux/smp.h>
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#include <asm/msr.h>
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struct msr_info {
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u32 msr_no;
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struct msr reg;
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struct msr *msrs;
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int err;
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};
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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 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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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 *msrs_alloc(void)
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{
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struct msr *msrs = NULL;
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@ -137,100 +21,3 @@ void msrs_free(struct msr *msrs)
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free_percpu(msrs);
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}
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EXPORT_SYMBOL(msrs_free);
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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 *rv = info;
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rv->err = rdmsr_safe(rv->msr_no, &rv->reg.l, &rv->reg.h);
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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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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_safe_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 ? err : rv.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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/*
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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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struct msr_regs_info {
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u32 *regs;
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int err;
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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)
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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)
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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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