docs/perf: Add explanation for DDR_CAP_AXI_ID_FILTER_ENHANCED quirk

Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

kernel os linux

Add explanation for DDR_CAP_AXI_ID_FILTER_ENHANCED quirk.

Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
[will: Simplified wording]
Signed-off-by: Will Deacon <will@kernel.org>

authored by

Joakim Zhang and committed by

Will Deacon 6 years ago 76d835fc 9ef8567c

1 changed file

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Documentation

admin-guide

perf

imx-ddr.rst

Documentation/admin-guide/perf/imx-ddr.rst

··· 50 50 axi_id to monitor a specific id, rather than having to specify axi_mask. 51 51 e.g.:: 52 52 perf stat -a -e imx8_ddr0/axid-read,axi_id=0x12/ cmd, which will monitor ARID=0x12 53 + 54 + * With DDR_CAP_AXI_ID_FILTER_ENHANCED quirk. 55 + This is an extension to the DDR_CAP_AXI_ID_FILTER quirk which permits 56 + counting the number of bytes (as opposed to the number of bursts) from DDR 57 + read and write transactions concurrently with another set of data counters.