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docs/perf: Add explanation for DDR_CAP_AXI_ID_FILTER_ENHANCED quirk 

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>
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Joakim Zhang 2019-11-01 08:36:10 +00:00 committed by Will Deacon
parent 9ef8567ccf
commit 76d835fcd4
1 changed files with 5 additions and 0 deletions
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Documentation/admin-guide/perf/imx-ddr.rst
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@ -50,3 +50,8 @@ in the driver.
axi_id to monitor a specific id, rather than having to specify axi_mask.
e.g.::
perf stat -a -e imx8_ddr0/axid-read,axi_id=0x12/ cmd, which will monitor ARID=0x12
* With DDR_CAP_AXI_ID_FILTER_ENHANCED quirk.
This is an extension to the DDR_CAP_AXI_ID_FILTER quirk which permits
counting the number of bytes (as opposed to the number of bursts) from DDR
read and write transactions concurrently with another set of data counters.