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coresight: trbe: Add a helper to calculate the trace generated

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We collect the trace from the TRBE on FILL event from IRQ context
and via update_buffer(), when the event is stopped. Let us
consolidate how we calculate the trace generated into a helper.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20211019163153.3692640-6-suzuki.poulose@arm.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
This commit is contained in:
Suzuki K Poulose 2021-10-19 17:31:43 +01:00 committed by Mathieu Poirier
parent a08025b3fe
commit 41c0e5b7a3
1 changed files with 29 additions and 18 deletions
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47
drivers/hwtracing/coresight/coresight-trbe.c
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@ -499,6 +499,29 @@ static enum trbe_fault_action trbe_get_fault_act(u64 trbsr)
return TRBE_FAULT_ACT_SPURIOUS;
}
static unsigned long trbe_get_trace_size(struct perf_output_handle *handle,
struct trbe_buf *buf, bool wrap)
{
u64 write;
u64 start_off, end_off;
/*
* If the TRBE has wrapped around the write pointer has
* wrapped and should be treated as limit.
*/
if (wrap)
write = get_trbe_limit_pointer();
else
write = get_trbe_write_pointer();
end_off = write - get_trbe_base_pointer();
start_off = PERF_IDX2OFF(handle->head, buf);
if (WARN_ON_ONCE(end_off < start_off))
return 0;
return (end_off - start_off);
}
static void *arm_trbe_alloc_buffer(struct coresight_device *csdev,
struct perf_event *event, void **pages,
int nr_pages, bool snapshot)
@ -560,9 +583,9 @@ static unsigned long arm_trbe_update_buffer(struct coresight_device *csdev,
struct trbe_cpudata *cpudata = dev_get_drvdata(&csdev->dev);
struct trbe_buf *buf = config;
enum trbe_fault_action act;
unsigned long size, offset;
unsigned long write, base, status;
unsigned long size, status;
unsigned long flags;
bool wrap = false;
WARN_ON(buf->cpudata != cpudata);
WARN_ON(cpudata->cpu != smp_processor_id());
@ -602,8 +625,6 @@ static unsigned long arm_trbe_update_buffer(struct coresight_device *csdev,
* handle gets freed in etm_event_stop().
*/
trbe_drain_and_disable_local();
write = get_trbe_write_pointer();
base = get_trbe_base_pointer();
/* Check if there is a pending interrupt and handle it here */
status = read_sysreg_s(SYS_TRBSR_EL1);
@ -627,20 +648,11 @@ static unsigned long arm_trbe_update_buffer(struct coresight_device *csdev,
goto done;
}
/*
* Otherwise, the buffer is full and the write pointer
* has reached base. Adjust this back to the Limit pointer
* for correct size. Also, mark the buffer truncated.
*/
write = get_trbe_limit_pointer();
trbe_report_wrap_event(handle);
wrap = true;
}
offset = write - base;
if (WARN_ON_ONCE(offset < PERF_IDX2OFF(handle->head, buf)))
size = 0;
else
size = offset - PERF_IDX2OFF(handle->head, buf);
size = trbe_get_trace_size(handle, buf, wrap);
done:
local_irq_restore(flags);
@ -721,11 +733,10 @@ static int trbe_handle_overflow(struct perf_output_handle *handle)
{
struct perf_event *event = handle->event;
struct trbe_buf *buf = etm_perf_sink_config(handle);
unsigned long offset, size;
unsigned long size;
struct etm_event_data *event_data;
offset = get_trbe_limit_pointer() - get_trbe_base_pointer();
size = offset - PERF_IDX2OFF(handle->head, buf);
size = trbe_get_trace_size(handle, buf, true);
if (buf->snapshot)
handle->head += size;