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Subject[PATCH 07/10] perf: Directly pass PERF_AUX_* flags to perf_aux_output_end
Date
In preparation for adding additional flags to perf AUX records, allow
the flags for a session to be passed directly to perf_aux_output_end,
rather than extend the function to take a bool for each one.

Signed-off-by: Will Deacon <will.deacon@arm.com>
---
arch/x86/events/intel/bts.c | 11 ++++++-----
arch/x86/events/intel/pt.c | 11 +++++++----
drivers/hwtracing/coresight/coresight-etm-perf.c | 5 +++--
include/linux/perf_event.h | 4 ++--
kernel/events/ring_buffer.c | 12 +++++-------
5 files changed, 23 insertions(+), 20 deletions(-)

diff --git a/arch/x86/events/intel/bts.c b/arch/x86/events/intel/bts.c
index 982c9e31daca..2aa63190f01e 100644
--- a/arch/x86/events/intel/bts.c
+++ b/arch/x86/events/intel/bts.c
@@ -276,7 +276,7 @@ static void bts_event_start(struct perf_event *event, int flags)
return;

fail_end_stop:
- perf_aux_output_end(&bts->handle, 0, false);
+ perf_aux_output_end(&bts->handle, 0, 0);

fail_stop:
event->hw.state = PERF_HES_STOPPED;
@@ -319,9 +319,9 @@ static void bts_event_stop(struct perf_event *event, int flags)
bts->handle.head =
local_xchg(&buf->data_size,
buf->nr_pages << PAGE_SHIFT);
-
perf_aux_output_end(&bts->handle, local_xchg(&buf->data_size, 0),
- !!local_xchg(&buf->lost, 0));
+ local_xchg(&buf->lost, 0) ?
+ PERF_AUX_FLAG_TRUNCATED : 0);
}

cpuc->ds->bts_index = bts->ds_back.bts_buffer_base;
@@ -485,7 +485,8 @@ int intel_bts_interrupt(void)
return handled;

perf_aux_output_end(&bts->handle, local_xchg(&buf->data_size, 0),
- !!local_xchg(&buf->lost, 0));
+ local_xchg(&buf->lost, 0) ?
+ PERF_AUX_FLAG_OVERWRITE : 0);

buf = perf_aux_output_begin(&bts->handle, event);
if (buf)
@@ -500,7 +501,7 @@ int intel_bts_interrupt(void)
* cleared handle::event
*/
barrier();
- perf_aux_output_end(&bts->handle, 0, false);
+ perf_aux_output_end(&bts->handle, 0, 0);
}
}

diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c
index 1c1b9fe705c8..e229f675114d 100644
--- a/arch/x86/events/intel/pt.c
+++ b/arch/x86/events/intel/pt.c
@@ -1187,7 +1187,8 @@ void intel_pt_interrupt(void)
pt_update_head(pt);

perf_aux_output_end(&pt->handle, local_xchg(&buf->data_size, 0),
- local_xchg(&buf->lost, 0));
+ local_xchg(&buf->lost, 0) ?
+ PERF_AUX_FLAG_TRUNCATED : 0);

if (!event->hw.state) {
int ret;
@@ -1202,7 +1203,8 @@ void intel_pt_interrupt(void)
/* snapshot counters don't use PMI, so it's safe */
ret = pt_buffer_reset_markers(buf, &pt->handle);
if (ret) {
- perf_aux_output_end(&pt->handle, 0, true);
+ perf_aux_output_end(&pt->handle, 0,
+ PERF_AUX_FLAG_TRUNCATED);
return;
}

@@ -1274,7 +1276,7 @@ static void pt_event_start(struct perf_event *event, int mode)
return;

fail_end_stop:
- perf_aux_output_end(&pt->handle, 0, true);
+ perf_aux_output_end(&pt->handle, 0, PERF_AUX_FLAG_TRUNCATED);
fail_stop:
hwc->state = PERF_HES_STOPPED;
}
@@ -1316,7 +1318,8 @@ static void pt_event_stop(struct perf_event *event, int mode)
local_xchg(&buf->data_size,
buf->nr_pages << PAGE_SHIFT);
perf_aux_output_end(&pt->handle, local_xchg(&buf->data_size, 0),
- local_xchg(&buf->lost, 0));
+ local_xchg(&buf->lost, 0) ?
+ PERF_AUX_FLAG_TRUNCATED : 0);
}
}

diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c
index 17741969026e..4a425b2f62ee 100644
--- a/drivers/hwtracing/coresight/coresight-etm-perf.c
+++ b/drivers/hwtracing/coresight/coresight-etm-perf.c
@@ -301,7 +301,7 @@ static void etm_event_start(struct perf_event *event, int flags)
return;

fail_end_stop:
- perf_aux_output_end(handle, 0, true);
+ perf_aux_output_end(handle, 0, PERF_AUX_FLAG_TRUNCATED);
fail:
event->hw.state = PERF_HES_STOPPED;
goto out;
@@ -350,7 +350,8 @@ static void etm_event_stop(struct perf_event *event, int mode)
event_data->snk_config,
&lost);

- perf_aux_output_end(handle, size, lost);
+ perf_aux_output_end(handle, size,
+ lost ? PERF_AUX_FLAG_TRUNCATED : 0);
}

/* Disabling the path make its elements available to other sessions */
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 78ed8105e64d..79439bd9dd47 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -847,7 +847,7 @@ perf_cgroup_from_task(struct task_struct *task, struct perf_event_context *ctx)
extern void *perf_aux_output_begin(struct perf_output_handle *handle,
struct perf_event *event);
extern void perf_aux_output_end(struct perf_output_handle *handle,
- unsigned long size, bool truncated);
+ unsigned long size, u64 flags);
extern int perf_aux_output_skip(struct perf_output_handle *handle,
unsigned long size);
extern void *perf_get_aux(struct perf_output_handle *handle);
@@ -1266,7 +1266,7 @@ perf_aux_output_begin(struct perf_output_handle *handle,
struct perf_event *event) { return NULL; }
static inline void
perf_aux_output_end(struct perf_output_handle *handle, unsigned long size,
- bool truncated) { }
+ u64 flags) { }
static inline int
perf_aux_output_skip(struct perf_output_handle *handle,
unsigned long size) { return -EINVAL; }
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index 64158071690c..2c8af2e75953 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -410,15 +410,11 @@ EXPORT_SYMBOL_GPL(perf_aux_output_begin);
* transaction must be stopped and therefore drop the AUX reference count.
*/
void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size,
- bool truncated)
+ u64 flags)
{
struct ring_buffer *rb = handle->rb;
- bool wakeup = truncated;
+ bool wakeup = !!flags;
unsigned long aux_head;
- u64 flags = 0;
-
- if (truncated)
- flags |= PERF_AUX_FLAG_TRUNCATED;

/* in overwrite mode, driver provides aux_head via handle */
if (rb->aux_overwrite) {
@@ -427,6 +423,8 @@ void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size,
aux_head = handle->head;
local_set(&rb->aux_head, aux_head);
} else {
+ flags &= ~PERF_AUX_FLAG_OVERWRITE;
+
aux_head = local_read(&rb->aux_head);
local_add(size, &rb->aux_head);
}
@@ -447,7 +445,7 @@ void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size,
}

if (wakeup) {
- if (truncated)
+ if (flags & PERF_AUX_FLAG_TRUNCATED)
handle->event->pending_disable = 1;
perf_output_wakeup(handle);
}
--
2.1.4
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