* [PATCH 1/2] powerpc/perf: Fix pmu_count to count only nest imc pmus @ 2017-11-10 20:39 Madhavan Srinivasan 2017-11-10 20:39 ` [PATCH 2/2] powerpc/perf: Fix IMC_MAX_PMU macro Madhavan Srinivasan 0 siblings, 1 reply; 4+ messages in thread From: Madhavan Srinivasan @ 2017-11-10 20:39 UTC (permalink / raw) To: mpe; +Cc: linuxppc-dev, Madhavan Srinivasan "pmu_count" in opal_imc_counters_probe() is intended to hold the number of successful nest imc pmu registerations. But current code also counts other imc units like core_imc and thread_imc. Patch add a check to count only nest imc pmus. Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> --- arch/powerpc/platforms/powernv/opal-imc.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/platforms/powernv/opal-imc.c b/arch/powerpc/platforms/powernv/opal-imc.c index 21f6531fae20..b150f4deaccf 100644 --- a/arch/powerpc/platforms/powernv/opal-imc.c +++ b/arch/powerpc/platforms/powernv/opal-imc.c @@ -191,8 +191,10 @@ static int opal_imc_counters_probe(struct platform_device *pdev) break; } - if (!imc_pmu_create(imc_dev, pmu_count, domain)) - pmu_count++; + if (!imc_pmu_create(imc_dev, pmu_count, domain)) { + if (domain == IMC_DOMAIN_NEST) + pmu_count++; + } } return 0; -- 2.7.4 ^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH 2/2] powerpc/perf: Fix IMC_MAX_PMU macro 2017-11-10 20:39 [PATCH 1/2] powerpc/perf: Fix pmu_count to count only nest imc pmus Madhavan Srinivasan @ 2017-11-10 20:39 ` Madhavan Srinivasan 2017-11-22 1:23 ` Michael Ellerman 0 siblings, 1 reply; 4+ messages in thread From: Madhavan Srinivasan @ 2017-11-10 20:39 UTC (permalink / raw) To: mpe; +Cc: linuxppc-dev, Madhavan Srinivasan 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> --- arch/powerpc/include/asm/imc-pmu.h | 6 +----- arch/powerpc/perf/imc-pmu.c | 15 ++++++++++++--- arch/powerpc/platforms/powernv/opal-imc.c | 16 ++++++++++++++++ 3 files changed, 29 insertions(+), 8 deletions(-) diff --git a/arch/powerpc/include/asm/imc-pmu.h b/arch/powerpc/include/asm/imc-pmu.h index 7f74c282710f..fad0e6ff460f 100644 --- a/arch/powerpc/include/asm/imc-pmu.h +++ b/arch/powerpc/include/asm/imc-pmu.h @@ -21,11 +21,6 @@ #include <asm/opal.h> /* - * For static allocation of some of the structures. - */ -#define IMC_MAX_PMUS 32 - -/* * Compatibility macros for IMC devices */ #define IMC_DTB_COMPAT "ibm,opal-in-memory-counters" @@ -125,4 +120,5 @@ enum { 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); #endif /* __ASM_POWERPC_IMC_PMU_H */ diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c index 74db696ef365..c40cb5f7ceaf 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) @@ -1192,6 +1193,7 @@ 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; } @@ -1216,6 +1218,13 @@ 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: diff --git a/arch/powerpc/platforms/powernv/opal-imc.c b/arch/powerpc/platforms/powernv/opal-imc.c index b150f4deaccf..4764e6932cb7 100644 --- a/arch/powerpc/platforms/powernv/opal-imc.c +++ b/arch/powerpc/platforms/powernv/opal-imc.c @@ -153,6 +153,22 @@ static void disable_core_pmu_counters(void) put_online_cpus(); } +int get_max_nest_dev(void) +{ + struct device_node *node; + u32 pmu_units, type; + + for_each_compatible_node(node, NULL, IMC_DTB_UNIT_COMPAT) { + if (of_property_read_u32(node, "type", &type)) + continue; + + if (type == IMC_TYPE_CHIP) + pmu_units++; + } + + return pmu_units; +} + static int opal_imc_counters_probe(struct platform_device *pdev) { struct device_node *imc_dev = pdev->dev.of_node; -- 2.7.4 ^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH 2/2] powerpc/perf: Fix IMC_MAX_PMU macro 2017-11-10 20:39 ` [PATCH 2/2] powerpc/perf: Fix IMC_MAX_PMU macro Madhavan Srinivasan @ 2017-11-22 1:23 ` Michael Ellerman 2017-11-22 5:19 ` Madhavan Srinivasan 0 siblings, 1 reply; 4+ messages in thread From: Michael Ellerman @ 2017-11-22 1:23 UTC (permalink / raw) To: Madhavan Srinivasan; +Cc: linuxppc-dev, Madhavan Srinivasan Madhavan Srinivasan <maddy@linux.vnet.ibm.com> writes: > diff --git a/arch/powerpc/platforms/powernv/opal-imc.c b/arch/powerpc/platforms/powernv/opal-imc.c > index b150f4deaccf..4764e6932cb7 100644 > --- a/arch/powerpc/platforms/powernv/opal-imc.c > +++ b/arch/powerpc/platforms/powernv/opal-imc.c > @@ -153,6 +153,22 @@ static void disable_core_pmu_counters(void) > put_online_cpus(); > } > > +int get_max_nest_dev(void) > +{ > + struct device_node *node; > + u32 pmu_units, type; > + > + for_each_compatible_node(node, NULL, IMC_DTB_UNIT_COMPAT) { > + if (of_property_read_u32(node, "type", &type)) > + continue; > + > + if (type == IMC_TYPE_CHIP) > + pmu_units++; > + } > + > + return pmu_units; > +} Breaks: arch/powerpc/platforms/powernv/opal-imc.c:169:2: error: 'pmu_units' may be used uninitialized in this function [-Werror=maybe-uninitialized] http://kisskb.ellerman.id.au/kisskb/head/1e59fb813346ee43be2a3a9acf4aac2815af1284/ cheers ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH 2/2] powerpc/perf: Fix IMC_MAX_PMU macro 2017-11-22 1:23 ` Michael Ellerman @ 2017-11-22 5:19 ` Madhavan Srinivasan 0 siblings, 0 replies; 4+ messages in thread From: Madhavan Srinivasan @ 2017-11-22 5:19 UTC (permalink / raw) To: Michael Ellerman; +Cc: linuxppc-dev On Wednesday 22 November 2017 06:53 AM, Michael Ellerman wrote: > Madhavan Srinivasan <maddy@linux.vnet.ibm.com> writes: > >> diff --git a/arch/powerpc/platforms/powernv/opal-imc.c b/arch/powerpc/platforms/powernv/opal-imc.c >> index b150f4deaccf..4764e6932cb7 100644 >> --- a/arch/powerpc/platforms/powernv/opal-imc.c >> +++ b/arch/powerpc/platforms/powernv/opal-imc.c >> @@ -153,6 +153,22 @@ static void disable_core_pmu_counters(void) >> put_online_cpus(); >> } >> >> +int get_max_nest_dev(void) >> +{ >> + struct device_node *node; >> + u32 pmu_units, type; >> + >> + for_each_compatible_node(node, NULL, IMC_DTB_UNIT_COMPAT) { >> + if (of_property_read_u32(node, "type", &type)) >> + continue; >> + >> + if (type == IMC_TYPE_CHIP) >> + pmu_units++; >> + } >> + >> + return pmu_units; >> +} > Breaks: > > arch/powerpc/platforms/powernv/opal-imc.c:169:2: error: 'pmu_units' may be used uninitialized in this function [-Werror=maybe-uninitialized] My bad. My cross tool also missed to catch this. Will respin. Maddy > > http://kisskb.ellerman.id.au/kisskb/head/1e59fb813346ee43be2a3a9acf4aac2815af1284/ > > cheers > ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2017-11-22 5:19 UTC | newest] Thread overview: 4+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2017-11-10 20:39 [PATCH 1/2] powerpc/perf: Fix pmu_count to count only nest imc pmus Madhavan Srinivasan 2017-11-10 20:39 ` [PATCH 2/2] powerpc/perf: Fix IMC_MAX_PMU macro Madhavan Srinivasan 2017-11-22 1:23 ` Michael Ellerman 2017-11-22 5:19 ` Madhavan Srinivasan
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