From e7cc7a3ab2770b9f40569a84c417afdad59531bc Mon Sep 17 00:00:00 2001
From: Atish Patra <atish.patra@wdc.com>
Date: Sat, 10 Jul 2021 09:18:10 -0700
Subject: lib: sbi: Add PMU specific platform hooks
A platform hook to initialize PMU allows platform vendors to provide
their own mechanism to define pmu event-counter mappings in addition
to the DT based approach.
Another platform hook that allows platform vendors customize the
final mhpmevent value configuration.
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Atish Patra <atish.patra@wdc.com>
---
include/sbi/sbi_platform.h | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/include/sbi/sbi_platform.h b/include/sbi/sbi_platform.h
index f8074d2..4d192f2 100644
--- a/include/sbi/sbi_platform.h
+++ b/include/sbi/sbi_platform.h
@@ -89,6 +89,12 @@ struct sbi_platform_operations {
/** Initialize (or populate) domains for the platform */
int (*domains_init)(void);
+ /** Initialize hw performance counters */
+ int (*pmu_init)(void);
+
+ /** Get platform specific mhpmevent value */
+ uint64_t (*pmu_xlate_to_mhpmevent)(uint32_t event_idx, uint64_t data);
+
/** Initialize the platform console */
int (*console_init)(void);
@@ -391,6 +397,39 @@ static inline int sbi_platform_domains_init(const struct sbi_platform *plat)
return 0;
}
+/**
+ * Setup hw PMU events for the platform
+ *
+ * @param plat pointer to struct sbi_platform
+ *
+ * @return 0 on success and negative error code on failure
+ */
+static inline int sbi_platform_pmu_init(const struct sbi_platform *plat)
+{
+ if (plat && sbi_platform_ops(plat)->pmu_init)
+ return sbi_platform_ops(plat)->pmu_init();
+ return 0;
+}
+
+/**
+ * Get the value to be written in mhpmeventx for event_idx
+ *
+ * @param plat pointer to struct sbi_platform
+ * @param event_idx ID of the PMU event
+ * @param data Additional configuration data passed from supervisor software
+ *
+ * @return expected value by the platform or 0 if platform doesn't know about
+ * the event
+ */
+static inline uint64_t sbi_platform_pmu_xlate_to_mhpmevent(const struct sbi_platform *plat,
+ uint32_t event_idx, uint64_t data)
+{
+ if (plat && sbi_platform_ops(plat)->pmu_xlate_to_mhpmevent)
+ return sbi_platform_ops(plat)->pmu_xlate_to_mhpmevent(event_idx,
+ data);
+ return 0;
+}
+
/**
* Initialize the platform console
*
--
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