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perf/x86/amd: Try to fix some mem allocation failure handling

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According to Peter's advice, put the failure handling to a goto chain.
Compiled in x86_64, could you check if there is anything that I missed.

Signed-off-by: Zhouyi Zhou <yizhouzhou@ict.ac.cn>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1402459743-20513-1-git-send-email-zhouzhouyi@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Zhouyi Zhou 2014-06-11 12:09:03 +08:00 committed by Ingo Molnar
parent 8b5b584daf
commit 503d3291a9
1 changed files with 84 additions and 27 deletions
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111
arch/x86/kernel/cpu/perf_event_amd_uncore.c
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@ -294,31 +294,41 @@ static struct amd_uncore *amd_uncore_alloc(unsigned int cpu)
cpu_to_node(cpu));
}
static void amd_uncore_cpu_up_prepare(unsigned int cpu)
static int amd_uncore_cpu_up_prepare(unsigned int cpu)
{
struct amd_uncore *uncore;
struct amd_uncore *uncore_nb = NULL, *uncore_l2;
if (amd_uncore_nb) {
uncore = amd_uncore_alloc(cpu);
uncore->cpu = cpu;
uncore->num_counters = NUM_COUNTERS_NB;
uncore->rdpmc_base = RDPMC_BASE_NB;
uncore->msr_base = MSR_F15H_NB_PERF_CTL;
uncore->active_mask = &amd_nb_active_mask;
uncore->pmu = &amd_nb_pmu;
*per_cpu_ptr(amd_uncore_nb, cpu) = uncore;
uncore_nb = amd_uncore_alloc(cpu);
if (!uncore_nb)
goto fail;
uncore_nb->cpu = cpu;
uncore_nb->num_counters = NUM_COUNTERS_NB;
uncore_nb->rdpmc_base = RDPMC_BASE_NB;
uncore_nb->msr_base = MSR_F15H_NB_PERF_CTL;
uncore_nb->active_mask = &amd_nb_active_mask;
uncore_nb->pmu = &amd_nb_pmu;
*per_cpu_ptr(amd_uncore_nb, cpu) = uncore_nb;
}
if (amd_uncore_l2) {
uncore = amd_uncore_alloc(cpu);
uncore->cpu = cpu;
uncore->num_counters = NUM_COUNTERS_L2;
uncore->rdpmc_base = RDPMC_BASE_L2;
uncore->msr_base = MSR_F16H_L2I_PERF_CTL;
uncore->active_mask = &amd_l2_active_mask;
uncore->pmu = &amd_l2_pmu;
*per_cpu_ptr(amd_uncore_l2, cpu) = uncore;
uncore_l2 = amd_uncore_alloc(cpu);
if (!uncore_l2)
goto fail;
uncore_l2->cpu = cpu;
uncore_l2->num_counters = NUM_COUNTERS_L2;
uncore_l2->rdpmc_base = RDPMC_BASE_L2;
uncore_l2->msr_base = MSR_F16H_L2I_PERF_CTL;
uncore_l2->active_mask = &amd_l2_active_mask;
uncore_l2->pmu = &amd_l2_pmu;
*per_cpu_ptr(amd_uncore_l2, cpu) = uncore_l2;
}
return 0;
fail:
kfree(uncore_nb);
return -ENOMEM;
}
static struct amd_uncore *
@ -441,7 +451,7 @@ static void uncore_dead(unsigned int cpu, struct amd_uncore * __percpu *uncores)
if (!--uncore->refcnt)
kfree(uncore);
*per_cpu_ptr(amd_uncore_nb, cpu) = NULL;
*per_cpu_ptr(uncores, cpu) = NULL;
}
static void amd_uncore_cpu_dead(unsigned int cpu)
@ -461,7 +471,8 @@ amd_uncore_cpu_notifier(struct notifier_block *self, unsigned long action,
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_UP_PREPARE:
amd_uncore_cpu_up_prepare(cpu);
if (amd_uncore_cpu_up_prepare(cpu))
return notifier_from_errno(-ENOMEM);
break;
case CPU_STARTING:
@ -501,20 +512,33 @@ static void __init init_cpu_already_online(void *dummy)
amd_uncore_cpu_online(cpu);
}
static void cleanup_cpu_online(void *dummy)
{
unsigned int cpu = smp_processor_id();
amd_uncore_cpu_dead(cpu);
}
static int __init amd_uncore_init(void)
{
unsigned int cpu;
unsigned int cpu, cpu2;
int ret = -ENODEV;
if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
return -ENODEV;
goto fail_nodev;
if (!cpu_has_topoext)
return -ENODEV;
goto fail_nodev;
if (cpu_has_perfctr_nb) {
amd_uncore_nb = alloc_percpu(struct amd_uncore *);
perf_pmu_register(&amd_nb_pmu, amd_nb_pmu.name, -1);
if (!amd_uncore_nb) {
ret = -ENOMEM;
goto fail_nb;
}
ret = perf_pmu_register(&amd_nb_pmu, amd_nb_pmu.name, -1);
if (ret)
goto fail_nb;
printk(KERN_INFO "perf: AMD NB counters detected\n");
ret = 0;
@ -522,20 +546,28 @@ static int __init amd_uncore_init(void)
if (cpu_has_perfctr_l2) {
amd_uncore_l2 = alloc_percpu(struct amd_uncore *);
perf_pmu_register(&amd_l2_pmu, amd_l2_pmu.name, -1);
if (!amd_uncore_l2) {
ret = -ENOMEM;
goto fail_l2;
}
ret = perf_pmu_register(&amd_l2_pmu, amd_l2_pmu.name, -1);
if (ret)
goto fail_l2;
printk(KERN_INFO "perf: AMD L2I counters detected\n");
ret = 0;
}
if (ret)
return -ENODEV;
goto fail_nodev;
cpu_notifier_register_begin();
/* init cpus already online before registering for hotplug notifier */
for_each_online_cpu(cpu) {
amd_uncore_cpu_up_prepare(cpu);
ret = amd_uncore_cpu_up_prepare(cpu);
if (ret)
goto fail_online;
smp_call_function_single(cpu, init_cpu_already_online, NULL, 1);
}
@ -543,5 +575,30 @@ static int __init amd_uncore_init(void)
cpu_notifier_register_done();
return 0;
fail_online:
for_each_online_cpu(cpu2) {
if (cpu2 == cpu)
break;
smp_call_function_single(cpu, cleanup_cpu_online, NULL, 1);
}
cpu_notifier_register_done();
/* amd_uncore_nb/l2 should have been freed by cleanup_cpu_online */
amd_uncore_nb = amd_uncore_l2 = NULL;
if (cpu_has_perfctr_l2)
perf_pmu_unregister(&amd_l2_pmu);
fail_l2:
if (cpu_has_perfctr_nb)
perf_pmu_unregister(&amd_nb_pmu);
if (amd_uncore_l2)
free_percpu(amd_uncore_l2);
fail_nb:
if (amd_uncore_nb)
free_percpu(amd_uncore_nb);
fail_nodev:
return ret;
}
device_initcall(amd_uncore_init);