[PATCH v4 09/10] powerpc/powernv: Thread IMC events detection

[Hemant Kumar]

Patch adds support for detection of thread IMC events. It adds a new
domain IMC_DOMAIN_THREAD and it is determined with the help of the
compatibility string "ibm,imc-counters-thread" based on the IMC device
tree.

Cc: Madhavan Srinivasan <maddy at linux.vnet.ibm.com>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Cc: Paul Mackerras <paulus at samba.org>
Cc: Anton Blanchard <anton at samba.org>
Cc: Sukadev Bhattiprolu <sukadev at linux.vnet.ibm.com>
Cc: Michael Neuling <mikey at neuling.org>
Cc: Stewart Smith <stewart at linux.vnet.ibm.com>
Cc: Daniel Axtens <dja at axtens.net>
Cc: Stephane Eranian <eranian at google.com>
Cc: Balbir Singh <bsingharora at gmail.com>
Cc: Anju T Sudhakar <anju at linux.vnet.ibm.com>
Signed-off-by: Hemant Kumar <hemant at linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/imc-pmu.h        |  2 ++
 arch/powerpc/perf/imc-pmu.c               |  1 +
 arch/powerpc/platforms/powernv/opal-imc.c | 11 +++++++++--
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/imc-pmu.h b/arch/powerpc/include/asm/imc-pmu.h
index 5e76cd0..f2b4f12 100644
--- a/arch/powerpc/include/asm/imc-pmu.h
+++ b/arch/powerpc/include/asm/imc-pmu.h
@@ -32,6 +32,7 @@
 #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"
+#define IMC_DTB_THREAD_COMPAT   "ibm,imc-counters-thread"
 
 /*
  * Structure to hold per chip specific memory address
@@ -70,6 +71,7 @@ struct imc_pmu {
  */
 #define IMC_DOMAIN_NEST		1
 #define IMC_DOMAIN_CORE		2
+#define IMC_DOMAIN_THREAD       3
 
 #define UNKNOWN_DOMAIN		-1
 
diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c
index 61d99c7..a48c5be 100644
--- a/arch/powerpc/perf/imc-pmu.c
+++ b/arch/powerpc/perf/imc-pmu.c
@@ -26,6 +26,7 @@ struct imc_pmu *core_imc_pmu;
 /* Needed for sanity check */
 extern u64 nest_max_offset;
 extern u64 core_max_offset;
+extern u64 thread_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 6db3c5f..a5565e7 100644
--- a/arch/powerpc/platforms/powernv/opal-imc.c
+++ b/arch/powerpc/platforms/powernv/opal-imc.c
@@ -39,6 +39,7 @@ extern int init_imc_pmu(struct imc_events *events,
 			int idx, struct imc_pmu *pmu_ptr);
 u64 nest_max_offset;
 u64 core_max_offset;
+u64 thread_max_offset;
 
 static int imc_event_info(char *name, struct imc_events *events)
 {
@@ -86,6 +87,10 @@ static void update_max_value(u32 value, int pmu_domain)
 		if (core_max_offset < value)
 			core_max_offset = value;
 		break;
+	case IMC_DOMAIN_THREAD:
+		if (thread_max_offset < value)
+			thread_max_offset = value;
+		break;
 	default:
 		/* Unknown domain, return */
 		return;
@@ -239,6 +244,8 @@ int imc_get_domain(struct device_node *pmu_dev)
 		return IMC_DOMAIN_NEST;
 	if (of_device_is_compatible(pmu_dev, IMC_DTB_CORE_COMPAT))
 		return IMC_DOMAIN_CORE;
+	if (of_device_is_compatible(pmu_dev, IMC_DTB_THREAD_COMPAT))
+		return IMC_DOMAIN_THREAD;
 	else
 		return UNKNOWN_DOMAIN;
 }
@@ -277,7 +284,7 @@ static void imc_free_events(struct imc_events *events, int nr_entries)
 /*
  * 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 or CORE), and
+ * Allocates memory for the pmu, sets up its domain (NEST/CORE/THREAD), and
  * allocates memory for the events supported by this pmu. Assigns a name for
  * the pmu. Calls imc_events_node_parser() to setup the individual events.
  * If everything goes fine, it calls, init_imc_pmu() to setup the pmu device
@@ -305,7 +312,7 @@ static int imc_pmu_create(struct device_node *parent, int pmu_index)
 	if (pmu_ptr->domain == UNKNOWN_DOMAIN)
 		goto free_pmu;
 
-	/* Needed for hotplug/migration */
+	/* Needed for hotplug/migration for nest and core IMC PMUs */
 	if (pmu_ptr->domain == IMC_DOMAIN_CORE)
 		core_imc_pmu = pmu_ptr;
 	else if (pmu_ptr->domain == IMC_DOMAIN_NEST)
-- 
2.7.4