diff options
| author | Madhavan Srinivasan <maddy@linux.vnet.ibm.com> | 2017-11-22 10:45:39 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-11-22 23:04:23 +1100 |
| commit | 73ce9aec65b17433e18163d07eb5cb6bf114bd6c (patch) | |
| tree | 5542875410b1fb049b34625245de3bfa10f708c6 /arch/powerpc/perf/imc-pmu.c | |
| parent | de34787f1096cce38e2590be0013b44418d14546 (diff) | |
powerpc/perf: Fix IMC_MAX_PMU macro
IMC_MAX_PMU is used for static storage (per_nest_pmu_arr) which holds
nest pmu information. Current value for the macro is 32 based on
the initial number of nest pmu units supported by the nest microcode.
But going forward, microcode could support more nest units. Instead
of static storage, patch to fix the code to dynamically allocate an
array based on the number of nest imc units found in the device tree.
Fixes:8f95faaac56c1 ('powerpc/powernv: Detect and create IMC device')
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/perf/imc-pmu.c')
| -rw-r--r-- | arch/powerpc/perf/imc-pmu.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c index cf64e16f92c2..0ead3cd73caa 100644 --- a/arch/powerpc/perf/imc-pmu.c +++ b/arch/powerpc/perf/imc-pmu.c @@ -26,7 +26,7 @@ */ static DEFINE_MUTEX(nest_init_lock); static DEFINE_PER_CPU(struct imc_pmu_ref *, local_nest_imc_refc); -static struct imc_pmu *per_nest_pmu_arr[IMC_MAX_PMUS]; +static struct imc_pmu **per_nest_pmu_arr; static cpumask_t nest_imc_cpumask; struct imc_pmu_ref *nest_imc_refc; static int nest_pmus; @@ -286,13 +286,14 @@ static struct imc_pmu_ref *get_nest_pmu_ref(int cpu) static void nest_change_cpu_context(int old_cpu, int new_cpu) { struct imc_pmu **pn = per_nest_pmu_arr; - int i; if (old_cpu < 0 || new_cpu < 0) return; - for (i = 0; *pn && i < IMC_MAX_PMUS; i++, pn++) + while (*pn) { perf_pmu_migrate_context(&(*pn)->pmu, old_cpu, new_cpu); + pn++; + } } static int ppc_nest_imc_cpu_offline(unsigned int cpu) @@ -1194,6 +1195,7 @@ static void imc_common_cpuhp_mem_free(struct imc_pmu *pmu_ptr) kfree(pmu_ptr->attr_groups[IMC_EVENT_ATTR]->attrs); kfree(pmu_ptr->attr_groups[IMC_EVENT_ATTR]); kfree(pmu_ptr); + kfree(per_nest_pmu_arr); return; } @@ -1218,6 +1220,13 @@ static int imc_mem_init(struct imc_pmu *pmu_ptr, struct device_node *parent, return -ENOMEM; /* Needed for hotplug/migration */ + if (!per_nest_pmu_arr) { + per_nest_pmu_arr = kcalloc(get_max_nest_dev() + 1, + sizeof(struct imc_pmu *), + GFP_KERNEL); + if (!per_nest_pmu_arr) + return -ENOMEM; + } per_nest_pmu_arr[pmu_index] = pmu_ptr; break; case IMC_DOMAIN_CORE: |