diff options
Diffstat (limited to 'arch/powerpc/oprofile/op_model_power4.c')
| -rw-r--r-- | arch/powerpc/oprofile/op_model_power4.c | 43 |
1 files changed, 9 insertions, 34 deletions
diff --git a/arch/powerpc/oprofile/op_model_power4.c b/arch/powerpc/oprofile/op_model_power4.c index 38db2ef..4c2beab 100644 --- a/arch/powerpc/oprofile/op_model_power4.c +++ b/arch/powerpc/oprofile/op_model_power4.c @@ -25,18 +25,14 @@ static unsigned long reset_value[OP_MAX_COUNTER]; static int oprofile_running; static int mmcra_has_sihv; +/* Unfortunately these bits vary between CPUs */ +static unsigned long mmcra_sihv = MMCRA_SIHV; +static unsigned long mmcra_sipr = MMCRA_SIPR; /* mmcr values are set in power4_reg_setup, used in power4_cpu_setup */ static u32 mmcr0_val; static u64 mmcr1_val; -static u32 mmcra_val; - -/* - * Since we do not have an NMI, backtracing through spinlocks is - * only a best guess. In light of this, allow it to be disabled at - * runtime. - */ -static int backtrace_spinlocks; +static u64 mmcra_val; static void power4_reg_setup(struct op_counter_config *ctr, struct op_system_config *sys, @@ -63,8 +59,6 @@ static void power4_reg_setup(struct op_counter_config *ctr, mmcr1_val = sys->mmcr1; mmcra_val = sys->mmcra; - backtrace_spinlocks = sys->backtrace_spinlocks; - for (i = 0; i < cur_cpu_spec->num_pmcs; ++i) reset_value[i] = 0x80000000UL - ctr[i].count; @@ -197,25 +191,6 @@ static void __attribute_used__ kernel_unknown_bucket(void) { } -static unsigned long check_spinlock_pc(struct pt_regs *regs, - unsigned long profile_pc) -{ - unsigned long pc = instruction_pointer(regs); - - /* - * If both the SIAR (sampled instruction) and the perfmon exception - * occurred in a spinlock region then we account the sample to the - * calling function. This isnt 100% correct, we really need soft - * IRQ disable so we always get the perfmon exception at the - * point at which the SIAR is set. - */ - if (backtrace_spinlocks && in_lock_functions(pc) && - in_lock_functions(profile_pc)) - return regs->link; - else - return profile_pc; -} - /* * On GQ and newer the MMCRA stores the HV and PR bits at the time * the SIAR was sampled. We use that to work out if the SIAR was sampled in @@ -228,17 +203,17 @@ static unsigned long get_pc(struct pt_regs *regs) /* Cant do much about it */ if (!mmcra_has_sihv) - return check_spinlock_pc(regs, pc); + return pc; mmcra = mfspr(SPRN_MMCRA); /* Were we in the hypervisor? */ - if (firmware_has_feature(FW_FEATURE_LPAR) && (mmcra & MMCRA_SIHV)) + if (firmware_has_feature(FW_FEATURE_LPAR) && (mmcra & mmcra_sihv)) /* function descriptor madness */ return *((unsigned long *)hypervisor_bucket); /* We were in userspace, nothing to do */ - if (mmcra & MMCRA_SIPR) + if (mmcra & mmcra_sipr) return pc; #ifdef CONFIG_PPC_RTAS @@ -257,7 +232,7 @@ static unsigned long get_pc(struct pt_regs *regs) /* function descriptor madness */ return *((unsigned long *)kernel_unknown_bucket); - return check_spinlock_pc(regs, pc); + return pc; } static int get_kernel(unsigned long pc) @@ -268,7 +243,7 @@ static int get_kernel(unsigned long pc) is_kernel = is_kernel_addr(pc); } else { unsigned long mmcra = mfspr(SPRN_MMCRA); - is_kernel = ((mmcra & MMCRA_SIPR) == 0); + is_kernel = ((mmcra & mmcra_sipr) == 0); } return is_kernel; |