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>

diff --git a/include/sbi/sbi_platform.h b/include/sbi/sbi_platform.h
index f8074d2..4d192f2 100644 (file)
--- 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);
 
@@ -392,6 +398,39 @@ static inline int sbi_platform_domains_init(const struct sbi_platform *plat)
 }
 
 /**
+ * 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
  *
  * @param plat pointer to struct sbi_platform