drivers: cci: Export CCI PMU revision

The event numbering changed between revision r0 and r1 of the CCI
PMU. Expose this to userspace to allow tooling to handle the
differences in event numbers.

Suggested-by: Drew Richardson <Drew.Richardson@arm.com>
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
index da485ae..5a86da9 100644 (file)
--- a/drivers/bus/arm-cci.c
+++ b/drivers/bus/arm-cci.c
@@ -31,7 +31,6 @@
 
 #define DRIVER_NAME            "CCI-400"
 #define DRIVER_NAME_PMU                DRIVER_NAME " PMU"
-#define PMU_NAME               "CCI_400"
 
 #define CCI_PORT_CTRL          0x0
 #define CCI_CTRL_STATUS                0xc
@@ -162,6 +161,15 @@ static struct pmu_port_event_ranges port_event_range[] = {
        },
 };
 
+/*
+ * Export different PMU names for the different revisions so userspace knows
+ * because the event ids are different
+ */
+static char *const pmu_names[] = {
+       [CCI_REV_R0] = "CCI_400",
+       [CCI_REV_R1] = "CCI_400_r1",
+};
+
 struct cci_pmu_drv_data {
        void __iomem *base;
        struct arm_pmu *cci_pmu;
@@ -520,7 +528,7 @@ static void pmu_write_counter(struct perf_event *event, u32 value)
 static int cci_pmu_init(struct arm_pmu *cci_pmu, struct platform_device *pdev)
 {
        *cci_pmu = (struct arm_pmu){
-               .name             = PMU_NAME,
+               .name             = pmu_names[probe_cci_revision()],
                .max_period       = (1LLU << 32) - 1,
                .get_hw_events    = pmu_get_hw_events,
                .get_event_idx    = pmu_get_event_idx,