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docs/perf: Add explanation for DDR_CAP_AXI_ID_PORT_CHANNEL_FILTER quirk

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Add explanation for DDR_CAP_AXI_ID_PORT_CHANNEL_FILTER quirk.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20231120093317.2652866-2-xu.yang_2@nxp.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Xu Yang 2023-11-20 17:33:14 +08:00 committed by Will Deacon
parent afd83967e7
commit 9745295358
1 changed files with 37 additions and 8 deletions
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45
Documentation/admin-guide/perf/imx-ddr.rst
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@ -13,8 +13,8 @@ is one register for each counter. Counter 0 is special in that it always counts
interrupt is raised. If any other counter overflows, it continues counting, and
no interrupt is raised.
The "format" directory describes format of the config (event ID) and config1
(AXI filtering) fields of the perf_event_attr structure, see /sys/bus/event_source/
The "format" directory describes format of the config (event ID) and config1/2
(AXI filter setting) fields of the perf_event_attr structure, see /sys/bus/event_source/
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/
devices/imx8_ddr0/events/. The "caps" directory describes filter features implemented
@ -28,12 +28,11 @@ in DDR PMU, see /sys/bus/events_source/devices/imx8_ddr0/caps/.
AXI filtering is only used by CSV modes 0x41 (axid-read) and 0x42 (axid-write)
to count reading or writing matches filter setting. Filter setting is various
from different DRAM controller implementations, which is distinguished by quirks
in the driver. You also can dump info from userspace, filter in "caps" directory
indicates whether PMU supports AXI ID filter or not; enhanced_filter indicates
whether PMU supports enhanced AXI ID filter or not. Value 0 for un-supported, and
value 1 for supported.
in the driver. You also can dump info from userspace, "caps" directory show the
type of AXI filter (filter, enhanced_filter and super_filter). Value 0 for
un-supported, and value 1 for supported.
* With DDR_CAP_AXI_ID_FILTER quirk(filter: 1, enhanced_filter: 0).
* With DDR_CAP_AXI_ID_FILTER quirk(filter: 1, enhanced_filter: 0, super_filter: 0).
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.
@ -65,7 +64,37 @@ value 1 for supported.
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(filter: 1, enhanced_filter: 1).
* With DDR_CAP_AXI_ID_FILTER_ENHANCED quirk(filter: 1, enhanced_filter: 1, super_filter: 0).
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.
* With DDR_CAP_AXI_ID_PORT_CHANNEL_FILTER quirk(filter: 0, enhanced_filter: 0, super_filter: 1).
There is a limitation in previous AXI filter, it cannot filter different IDs
at the same time as the filter is shared between counters. This quirk is the
extension of AXI ID filter. One improvement is that counter 1-3 has their own
filter, means that it supports concurrently filter various IDs. Another
improvement is that counter 1-3 supports AXI PORT and CHANNEL selection. Support
selecting address channel or data channel.
Filter is defined with 2 configuration registers per counter 1-3.
--Counter N MASK COMP register - including AXI_ID and AXI_MASKING.
--Counter N MUX CNTL register - including AXI CHANNEL and AXI PORT.
- 0: address channel
- 1: data channel
PMU in DDR subsystem, only one single port0 exists, so axi_port is reserved
which should be 0.
.. code-block:: bash
perf stat -a -e imx8_ddr0/axid-read,axi_mask=0xMMMM,axi_id=0xDDDD,axi_channel=0xH/ cmd
perf stat -a -e imx8_ddr0/axid-write,axi_mask=0xMMMM,axi_id=0xDDDD,axi_channel=0xH/ cmd
.. note::
axi_channel is inverted in userspace, and it will be reverted in driver
automatically. So that users do not need specify axi_channel if want to
monitor data channel from DDR transactions, since data channel is more
meaningful.