[RFC 09/14] lib: sbi: Add PMU specific platform hooks
Atish Patra
atish.patra at wdc.com
Fri Mar 19 22:13:00 GMT 2021
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.
Signed-off-by: Atish Patra <atish.patra at wdc.com>
---
include/sbi/sbi_platform.h | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/include/sbi/sbi_platform.h b/include/sbi/sbi_platform.h
index dadbc1e94e18..02773f672443 100644
--- a/include/sbi/sbi_platform.h
+++ b/include/sbi/sbi_platform.h
@@ -97,6 +97,11 @@ struct sbi_platform_operations {
/** Initialize (or populate) domains for the platform */
int (*domains_init)(void);
+ /** Initialize hw performance counters */
+ int (*pmu_init)(void);
+
+ uint64_t (*get_mhpmevent_value)(uint32_t event_idx, uint64_t data);
+
/** Write a character to the platform console output */
void (*console_putc)(char ch);
/** Read a character from the platform console input */
@@ -514,6 +519,39 @@ 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 int sbi_platform_get_mhpmevent_value(const struct sbi_platform *plat,
+ uint32_t event_idx, uint64_t data)
+{
+ if (plat && sbi_platform_ops(plat)->get_mhpmevent_value)
+ return sbi_platform_ops(plat)->get_mhpmevent_value(event_idx,
+ data);
+ return 0;
+}
+
/**
* Write a character to the platform console output
*
--
2.25.1
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