[Linux-kernel-mentees] [PATCH] Documentation: perf: fix kernel-doc warnings in imx-ddr.rst
Daniel W. S. Almeida
dwlsalmeida at gmail.com
Tue Oct 1 01:03:44 UTC 2019
From: "Daniel W. S. Almeida" <dwlsalmeida at gmail.com>
Unexpected indentation errors were reported due to missing blank lines.
Now fixed. No change in content otherwise.
Signed-off-by: Daniel W. S. Almeida <dwlsalmeida at gmail.com>
Documentation/admin-guide/perf/imx-ddr.rst | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Documentation/admin-guide/perf/imx-ddr.rst b/Documentation/admin-guide/perf/imx-ddr.rst
index 517a205abad6..75c8b46ba6f9 100644
@@ -18,6 +18,7 @@ The "format" directory describes format of the config (event ID) and config1
devices/imx8_ddr0/format/. The "events" directory describes the events types
hardware supported that can be used with perf tool, see /sys/bus/event_source/
perf stat -a -e imx8_ddr0/cycles/ cmd
perf stat -a -e imx8_ddr0/read/,imx8_ddr0/write/ cmd
@@ -31,16 +32,19 @@ in the driver.
Filter is defined with two configuration parts:
--AXI_ID defines AxID matching value.
--AXI_MASKING defines which bits of AxID are meaningful for the matching.
0：corresponding bit is masked.
1: corresponding bit is not masked, i.e. used to do the matching.
AXI_ID and AXI_MASKING are mapped on DPCR1 register in performance counter.
When non-masked bits are matching corresponding AXI_ID bits then counter is
incremented. Perf counter is incremented if
AxID && AXI_MASKING == AXI_ID && AXI_MASKING
This filter doesn't support filter different AXI ID for axid-read and axid-write
event at the same time as this filter is shared between counters.
perf stat -a -e imx8_ddr0/axid-read,axi_mask=0xMMMM,axi_id=0xDDDD/ cmd
perf stat -a -e imx8_ddr0/axid-write,axi_mask=0xMMMM,axi_id=0xDDDD/ cmd
@@ -48,5 +52,6 @@ in the driver.
NOTE: axi_mask is inverted in userspace(i.e. set bits are bits to mask), and
it will be reverted in driver automatically. so that the user can just specify
axi_id to monitor a specific id, rather than having to specify axi_mask.
perf stat -a -e imx8_ddr0/axid-read,axi_id=0x12/ cmd, which will monitor ARID=0x12
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