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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