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Subject[PATCH v7 06/10] powerpc/powernv: Core IMC events detection
Date
From: Hemant Kumar <hemant@linux.vnet.ibm.com>

This patch adds support for detection of core IMC events along with the
Nest IMC events. It adds a new domain IMC_DOMAIN_CORE and its determined
with the help of the compatibility string "ibm,imc-counters-core" based
on the IMC device tree.

Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Signed-off-by: Hemant Kumar <hemant@linux.vnet.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/imc-pmu.h | 4 +++-
arch/powerpc/perf/imc-pmu.c | 3 +++
arch/powerpc/platforms/powernv/opal-imc.c | 28 +++++++++++++++++++++++++---
3 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/include/asm/imc-pmu.h b/arch/powerpc/include/asm/imc-pmu.h
index 1478d0f..37fdd79 100644
--- a/arch/powerpc/include/asm/imc-pmu.h
+++ b/arch/powerpc/include/asm/imc-pmu.h
@@ -42,6 +42,7 @@
*/
#define IMC_DTB_COMPAT "ibm,opal-in-memory-counters"
#define IMC_DTB_NEST_COMPAT "ibm,imc-counters-nest"
+#define IMC_DTB_CORE_COMPAT "ibm,imc-counters-core"

/*
* Structure to hold per chip specific memory address
@@ -90,13 +91,14 @@ struct imc_pmu {
* Domains for IMC PMUs
*/
#define IMC_DOMAIN_NEST 1
+#define IMC_DOMAIN_CORE 2
#define IMC_DOMAIN_UNKNOWN -1

#define IMC_COUNTER_ENABLE 1
#define IMC_COUNTER_DISABLE 0

-
extern struct perchip_nest_info nest_perchip_info[IMC_MAX_CHIPS];
extern struct imc_pmu *per_nest_pmu_arr[IMC_MAX_PMUS];
+extern struct imc_pmu *core_imc_pmu;
extern int __init init_imc_pmu(struct imc_events *events,int idx, struct imc_pmu *pmu_ptr);
#endif /* PPC_POWERNV_IMC_PMU_DEF_H */
diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c
index b86ef86..6fdac40 100644
--- a/arch/powerpc/perf/imc-pmu.c
+++ b/arch/powerpc/perf/imc-pmu.c
@@ -24,8 +24,11 @@ static atomic_t nest_events;
/* Used to avoid races in calling enable/disable nest-pmu units*/
static DEFINE_MUTEX(imc_nest_reserve);

+struct imc_pmu *core_imc_pmu;
+
/* Needed for sanity check */
extern u64 nest_max_offset;
+extern u64 core_max_offset;

PMU_FORMAT_ATTR(event, "config:0-20");
static struct attribute *imc_format_attrs[] = {
diff --git a/arch/powerpc/platforms/powernv/opal-imc.c b/arch/powerpc/platforms/powernv/opal-imc.c
index 61f6d67..d712ef3 100644
--- a/arch/powerpc/platforms/powernv/opal-imc.c
+++ b/arch/powerpc/platforms/powernv/opal-imc.c
@@ -34,6 +34,7 @@
#include <asm/imc-pmu.h>

u64 nest_max_offset;
+u64 core_max_offset;

static int imc_event_prop_update(char *name, struct imc_events *events)
{
@@ -114,6 +115,10 @@ static void update_max_value(u32 value, int pmu_domain)
if (nest_max_offset < value)
nest_max_offset = value;
break;
+ case IMC_DOMAIN_CORE:
+ if (core_max_offset < value)
+ core_max_offset = value;
+ break;
default:
/* Unknown domain, return */
return;
@@ -357,7 +362,7 @@ static struct imc_events *imc_events_setup(struct device_node *parent,
/*
* imc_pmu_create : Takes the parent device which is the pmu unit and a
* pmu_index as the inputs.
- * Allocates memory for the pmu, sets up its domain (NEST), and
+ * Allocates memory for the pmu, sets up its domain (NEST/CORE), and
* calls imc_events_setup() to allocate memory for the events supported
* by this pmu. Assigns a name for the pmu. Calls imc_events_node_parser()
* to setup the individual events.
@@ -386,7 +391,10 @@ static int imc_pmu_create(struct device_node *parent, int pmu_index, int domain)
goto free_pmu;

/* Needed for hotplug/migration */
- per_nest_pmu_arr[pmu_index] = pmu_ptr;
+ if (pmu_ptr->domain == IMC_DOMAIN_CORE)
+ core_imc_pmu = pmu_ptr;
+ else if (pmu_ptr->domain == IMC_DOMAIN_NEST)
+ per_nest_pmu_arr[pmu_index] = pmu_ptr;

pp = of_find_property(parent, "name", NULL);
if (!pp) {
@@ -407,7 +415,10 @@ static int imc_pmu_create(struct device_node *parent, int pmu_index, int domain)
goto free_pmu;
}
/* Save the name to register it later */
- sprintf(buf, "nest_%s", (char *)pp->value);
+ if (pmu_ptr->domain == IMC_DOMAIN_NEST)
+ sprintf(buf, "nest_%s", (char *)pp->value);
+ else
+ sprintf(buf, "%s_imc", (char *)pp->value);
pmu_ptr->pmu.name = (char *)buf;

/*
@@ -461,6 +472,17 @@ static void __init imc_pmu_setup(struct device_node *parent)
return;
pmu_count++;
}
+ /*
+ * Loop through the imc-counters tree for each compatible
+ * "ibm,imc-counters-core", and update "struct imc_pmu".
+ */
+ for_each_compatible_node(child, NULL, IMC_DTB_CORE_COMPAT) {
+ domain = IMC_DOMAIN_CORE;
+ rc = imc_pmu_create(child, pmu_count, domain);
+ if (rc)
+ return;
+ pmu_count++;
+ }
}

static int opal_imc_counters_probe(struct platform_device *pdev)
--
2.7.4
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