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[PATCH] powerpc: Remove oprofile spinlock backtrace code 

Remove oprofile spinlock backtrace code now we have proper calltrace
support. Also make MMCRA sihv and sipr bits a variable since they may
change in future cpus. Finally, MMCRA should be a 64bit quantity.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Anton Blanchard 2006-03-27 12:00:45 +11:00 committed by Paul Mackerras
parent fa465f8c70
commit 15e812ad84
3 changed files with 9 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/powerpc/oprofile/common.c
View File

@ -117,17 +117,10 @@ static int op_powerpc_create_files(struct super_block *sb, struct dentry *root)
oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
#ifdef CONFIG_PPC64
oprofilefs_create_ulong(sb, root, "backtrace_spinlocks",
&sys.backtrace_spinlocks);
#endif
/* Default to tracing both kernel and user */
sys.enable_kernel = 1;
sys.enable_user = 1;
#ifdef CONFIG_PPC64
sys.backtrace_spinlocks = 0;
#endif
return 0;
}

43
arch/powerpc/oprofile/op_model_power4.c
View File

@ -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;

3
include/asm-powerpc/oprofile_impl.h
View File

@ -35,9 +35,6 @@ struct op_system_config {
#endif
unsigned long enable_kernel;
unsigned long enable_user;
#ifdef CONFIG_PPC64
unsigned long backtrace_spinlocks;
#endif
};
/* Per-arch configuration */