Ruidong Tian d3256d8040 coresight: tmc: Explicit type conversions to prevent integer overflow ... [ Upstream commit fd380097cd ] Perf cs_etm session executed unexpectedly when AUX buffer > 1G. perf record -C 0 -m ,2G -e cs_etm// -- <workload> [ perf record: Captured and wrote 2.615 MB perf.data ] Perf only collect about 2M perf data rather than 2G. This is becasuse the operation, "nr_pages << PAGE_SHIFT", in coresight tmc driver, will overflow when nr_pages >= 0x80000(correspond to 1G AUX buffer). The overflow cause buffer allocation to fail, and TMC driver will alloc minimal buffer size(1M). You can just get about 2M perf data(1M AUX buffer + perf data header) at least. Explicit convert nr_pages to 64 bit to avoid overflow. Fixes: 22f429f19c ("coresight: etm-perf: Add support for ETR backend") Fixes: 99443ea19e ("coresight: Add generic TMC sg table framework") Fixes: 2e499bbc1a ("coresight: tmc: implementing TMC-ETF AUX space API") Signed-off-by: Ruidong Tian <tianruidong@linux.alibaba.com> Reviewed-by: James Clark <james.clark@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20230804081514.120171-2-tianruidong@linux.alibaba.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-09-19 12:22:45 +02:00
..
coresight	coresight: tmc: Explicit type conversions to prevent integer overflow	2023-09-19 12:22:45 +02:00
intel_th	intel_th: pci: Add Raptor Lake-S CPU support	2022-08-17 14:24:21 +02:00
stm	stm class: Use correct UUID APIs	2021-04-16 07:26:50 +02:00
Kconfig	…