On 11/17/2011 2:38 AM, Joakim Tjernlund wrote:
arch/powerpc/oprofile/common.c has this init code:
int __init oprofile_arch_init(struct oprofile_operations *ops)
{
if (!cur_cpu_spec->oprofile_cpu_type)
return -ENODEV;
if (firmware_has_feature(FW_FEATURE_ISERIES))
return -ENODEV;
switch (cur_cpu_spec->oprofile_type) {
#ifdef CONFIG_PPC_BOOK3S_64
#ifdef CONFIG_OPROFILE_CELL
case PPC_OPROFILE_CELL:
if
(firmware_has_feature(FW_FEATURE_LPAR))
return -ENODEV;
model =&op_model_cell;
ops->sync_start =
model->sync_start;
ops->sync_stop =
model->sync_stop;
break;
#endif
case PPC_OPROFILE_RS64:
model =&op_model_rs64;
break;
case PPC_OPROFILE_POWER4:
model =&op_model_power4;
break;
case PPC_OPROFILE_PA6T:
model =&op_model_pa6t;
break;
#endif
#ifdef CONFIG_6xx
case PPC_OPROFILE_G4:
model =&op_model_7450;
break;
#endif
#if defined(CONFIG_FSL_EMB_PERFMON)
case PPC_OPROFILE_FSL_EMB:
model =&op_model_fsl_emb;
break;
#endif
default:
return -ENODEV;
}
model->num_counters = cur_cpu_spec->num_pmcs;
ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
ops->create_files = op_powerpc_create_files;
ops->setup = op_powerpc_setup;
ops->shutdown = op_powerpc_shutdown;
ops->start = op_powerpc_start;
ops->stop = op_powerpc_stop;
ops->backtrace = op_powerpc_backtrace;
}
Notice the first
if (!cur_cpu_spec->oprofile_cpu_type)
return -ENODEV;
if (firmware_has_feature(FW_FEATURE_ISERIES))
return -ENODEV;
For my e300c2 cpu both if's are false and I don't get support for
callgraph/backtrace
support. Moving the ops->backtrace = op_powerpc_backtrace; to the top
enables backtrace for me.
What kernel version are you using? Actually, looking at a 3.0.3 tree I happen
to have available, I see oprofile h/w event support (in
arch/powerpc/kernel/cputable.c) for e300c3 and e300c4, but not the other e300
flavors. I've added Andy Flemming from Freescale to cc. Maybe he knows why
e300c2 isn't supported.
-Maynard
This function needs fixing so its not all or nothing but I cannot make out
what is what so please, could someone look at this?
I am somewhat behind mainline so I will just use my hack for now.
Jocke
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