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| author | Anju T Sudhakar <anju@linux.vnet.ibm.com> | 2018-05-22 14:42:37 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-06-03 20:43:37 +1000 |
| commit | 25af86b2aeb60dd52bd18a875124490e23bd4515 (patch) | |
| tree | 0da13f3338cd72d753a1debda8ae0e5082f91f72 | |
| parent | e7a8ac433845aa86f39bf404ae4b7709f21c7d70 (diff) | |
| download | linux-0-day-25af86b2aeb60dd52bd18a875124490e23bd4515.tar.gz linux-0-day-25af86b2aeb60dd52bd18a875124490e23bd4515.tar.xz | |
powerpc/perf: Unregister thread-imc if core-imc not supported
Since thread-imc internally use the core-imc hardware infrastructure
and is depended on it, having thread-imc in the kernel in the
absence of core-imc is trivial. Patch disables thread-imc, if
core-imc is not registered.
Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Reviewed-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| -rw-r--r-- | arch/powerpc/include/asm/imc-pmu.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/perf/imc-pmu.c | 12 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal-imc.c | 9 |
3 files changed, 22 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/imc-pmu.h b/arch/powerpc/include/asm/imc-pmu.h index d76cb11be3e3f..69f516ecb2fde 100644 --- a/arch/powerpc/include/asm/imc-pmu.h +++ b/arch/powerpc/include/asm/imc-pmu.h @@ -128,4 +128,5 @@ extern int init_imc_pmu(struct device_node *parent, struct imc_pmu *pmu_ptr, int pmu_id); extern void thread_imc_disable(void); extern int get_max_nest_dev(void); +extern void unregister_thread_imc(void); #endif /* __ASM_POWERPC_IMC_PMU_H */ diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c index f563d30292ade..d1977b61f8271 100644 --- a/arch/powerpc/perf/imc-pmu.c +++ b/arch/powerpc/perf/imc-pmu.c @@ -40,6 +40,7 @@ static struct imc_pmu *core_imc_pmu; /* Thread IMC data structures and variables */ static DEFINE_PER_CPU(u64 *, thread_imc_mem); +static struct imc_pmu *thread_imc_pmu; static int thread_imc_mem_size; struct imc_pmu *imc_event_to_pmu(struct perf_event *event) @@ -1228,6 +1229,16 @@ static void imc_common_cpuhp_mem_free(struct imc_pmu *pmu_ptr) } } +/* + * Function to unregister thread-imc if core-imc + * is not registered. + */ +void unregister_thread_imc(void) +{ + imc_common_cpuhp_mem_free(thread_imc_pmu); + imc_common_mem_free(thread_imc_pmu); + perf_pmu_unregister(&thread_imc_pmu->pmu); +} /* * imc_mem_init : Function to support memory allocation for core imc. @@ -1296,6 +1307,7 @@ static int imc_mem_init(struct imc_pmu *pmu_ptr, struct device_node *parent, } } + thread_imc_pmu = pmu_ptr; break; default: return -EINVAL; diff --git a/arch/powerpc/platforms/powernv/opal-imc.c b/arch/powerpc/platforms/powernv/opal-imc.c index 490bb721879fb..58a07948c76e7 100644 --- a/arch/powerpc/platforms/powernv/opal-imc.c +++ b/arch/powerpc/platforms/powernv/opal-imc.c @@ -255,6 +255,7 @@ static int opal_imc_counters_probe(struct platform_device *pdev) { struct device_node *imc_dev = pdev->dev.of_node; int pmu_count = 0, domain; + bool core_imc_reg = false, thread_imc_reg = false; u32 type; /* @@ -292,6 +293,10 @@ static int opal_imc_counters_probe(struct platform_device *pdev) if (!imc_pmu_create(imc_dev, pmu_count, domain)) { if (domain == IMC_DOMAIN_NEST) pmu_count++; + if (domain == IMC_DOMAIN_CORE) + core_imc_reg = true; + if (domain == IMC_DOMAIN_THREAD) + thread_imc_reg = true; } } @@ -299,6 +304,10 @@ static int opal_imc_counters_probe(struct platform_device *pdev) if (pmu_count == 0) debugfs_remove_recursive(imc_debugfs_parent); + /* If core imc is not registered, unregister thread-imc */ + if (!core_imc_reg && thread_imc_reg) + unregister_thread_imc(); + return 0; } |