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coresight: tmc-etr: Fix barrier packet insertion for perf buffer 

commit 83be0b84fe upstream.

When the ETR is used in perf mode with a larger buffer (configured
via sysfs or the default size of 1M) than the perf aux buffer size,
we end up inserting the barrier packet at the wrong offset, while
moving the offset forward. i.e, instead of the "new moved offset",
we insert it at the current hardware buffer offset. These packets
will not be visible as they are never copied and could lead to
corruption in the trace decoding side, as the decoder is not aware
that it needs to reset the decoding.

Fixes: ec13c78d7b ("coresight: tmc-etr: Add barrier packets when moving offset forward")
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: stable@vger.kernel.org
Reported-by: Al Grant <al.grant@arm.com>
Tested-by: Mike Leach <mike.leach@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20201208182651.1597945-2-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Suzuki K Poulose 2020-12-08 11:26:49 -07:00 committed by Greg Kroah-Hartman
parent e81884d45a
commit 4c461e8d0e
1 changed files with 1 additions and 1 deletions
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2
drivers/hwtracing/coresight/coresight-tmc-etr.c
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@ -1535,7 +1535,7 @@ tmc_update_etr_buffer(struct coresight_device *csdev,
/* Insert barrier packets at the beginning, if there was an overflow */
if (lost)
tmc_etr_buf_insert_barrier_packet(etr_buf, etr_buf->offset);
tmc_etr_buf_insert_barrier_packet(etr_buf, offset);
tmc_etr_sync_perf_buffer(etr_perf, offset, size);
/*