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authorMarc Zyngier <maz@kernel.org>2023-05-28 09:02:05 +0100
committerWill Deacon <will@kernel.org>2023-06-05 15:39:59 +0100
commit8be3593b9efa8903d2ee7bb9cdf57a8e56c66f36 (patch)
tree394165bec082fa80641e466554bfb1dc85c67856 /drivers/perf
parent71746c995cac92fcf6a65661b51211cf2009d7f0 (diff)
drivers/perf: apple_m1: Force 63bit counters for M2 CPUs
Sidharth reports that on M2, the PMU never generates any interrupt when using 'perf record', which is a annoying as you get no sample. I'm temped to say "no sample, no problem", but others may have a different opinion. Upon investigation, it appears that the counters on M2 are significantly different from the ones on M1, as they count on 64 bits instead of 48. Which of course, in the fine M1 tradition, means that we can only use 63 bits, as the top bit is used to signal the interrupt... This results in having to introduce yet another flag to indicate yet another odd counter width. Who knows what the next crazy implementation will do... With this, perf can work out the correct offset, and 'perf record' works as intended. Tested on M2 and M2-Pro CPUs. Cc: Janne Grunau <j@jannau.net> Cc: Hector Martin <marcan@marcan.st> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will@kernel.org> Fixes: 7d0bfb7c9977 ("drivers/perf: apple_m1: Add Apple M2 support") Reported-by: Sidharth Kshatriya <sid.kshatriya@gmail.com> Tested-by: Sidharth Kshatriya <sid.kshatriya@gmail.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20230528080205.288446-1-maz@kernel.org Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/perf')
-rw-r--r--drivers/perf/apple_m1_cpu_pmu.c30
-rw-r--r--drivers/perf/arm_pmu.c2
2 files changed, 26 insertions, 6 deletions
diff --git a/drivers/perf/apple_m1_cpu_pmu.c b/drivers/perf/apple_m1_cpu_pmu.c
index 8574c6e58c83..cd2de44b61b9 100644
--- a/drivers/perf/apple_m1_cpu_pmu.c
+++ b/drivers/perf/apple_m1_cpu_pmu.c
@@ -493,6 +493,17 @@ static int m1_pmu_map_event(struct perf_event *event)
return armpmu_map_event(event, &m1_pmu_perf_map, NULL, M1_PMU_CFG_EVENT);
}
+static int m2_pmu_map_event(struct perf_event *event)
+{
+ /*
+ * Same deal as the above, except that M2 has 64bit counters.
+ * Which, as far as we're concerned, actually means 63 bits.
+ * Yes, this is getting awkward.
+ */
+ event->hw.flags |= ARMPMU_EVT_63BIT;
+ return armpmu_map_event(event, &m1_pmu_perf_map, NULL, M1_PMU_CFG_EVENT);
+}
+
static void m1_pmu_reset(void *info)
{
int i;
@@ -525,7 +536,7 @@ static int m1_pmu_set_event_filter(struct hw_perf_event *event,
return 0;
}
-static int m1_pmu_init(struct arm_pmu *cpu_pmu)
+static int m1_pmu_init(struct arm_pmu *cpu_pmu, u32 flags)
{
cpu_pmu->handle_irq = m1_pmu_handle_irq;
cpu_pmu->enable = m1_pmu_enable_event;
@@ -536,7 +547,14 @@ static int m1_pmu_init(struct arm_pmu *cpu_pmu)
cpu_pmu->clear_event_idx = m1_pmu_clear_event_idx;
cpu_pmu->start = m1_pmu_start;
cpu_pmu->stop = m1_pmu_stop;
- cpu_pmu->map_event = m1_pmu_map_event;
+
+ if (flags & ARMPMU_EVT_47BIT)
+ cpu_pmu->map_event = m1_pmu_map_event;
+ else if (flags & ARMPMU_EVT_63BIT)
+ cpu_pmu->map_event = m2_pmu_map_event;
+ else
+ return WARN_ON(-EINVAL);
+
cpu_pmu->reset = m1_pmu_reset;
cpu_pmu->set_event_filter = m1_pmu_set_event_filter;
@@ -550,25 +568,25 @@ static int m1_pmu_init(struct arm_pmu *cpu_pmu)
static int m1_pmu_ice_init(struct arm_pmu *cpu_pmu)
{
cpu_pmu->name = "apple_icestorm_pmu";
- return m1_pmu_init(cpu_pmu);
+ return m1_pmu_init(cpu_pmu, ARMPMU_EVT_47BIT);
}
static int m1_pmu_fire_init(struct arm_pmu *cpu_pmu)
{
cpu_pmu->name = "apple_firestorm_pmu";
- return m1_pmu_init(cpu_pmu);
+ return m1_pmu_init(cpu_pmu, ARMPMU_EVT_47BIT);
}
static int m2_pmu_avalanche_init(struct arm_pmu *cpu_pmu)
{
cpu_pmu->name = "apple_avalanche_pmu";
- return m1_pmu_init(cpu_pmu);
+ return m1_pmu_init(cpu_pmu, ARMPMU_EVT_63BIT);
}
static int m2_pmu_blizzard_init(struct arm_pmu *cpu_pmu)
{
cpu_pmu->name = "apple_blizzard_pmu";
- return m1_pmu_init(cpu_pmu);
+ return m1_pmu_init(cpu_pmu, ARMPMU_EVT_63BIT);
}
static const struct of_device_id m1_pmu_of_device_ids[] = {
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 15bd1e34a88e..277e29fbd504 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -109,6 +109,8 @@ static inline u64 arm_pmu_event_max_period(struct perf_event *event)
{
if (event->hw.flags & ARMPMU_EVT_64BIT)
return GENMASK_ULL(63, 0);
+ else if (event->hw.flags & ARMPMU_EVT_63BIT)
+ return GENMASK_ULL(62, 0);
else if (event->hw.flags & ARMPMU_EVT_47BIT)
return GENMASK_ULL(46, 0);
else