Merge tag 'docs-5.5a' of git://git.lwn.net/linux
Pull Documentation updates from Jonathan Corbet: "Here are the main documentation changes for 5.5: - Various kerneldoc script enhancements. - More RST conversions; those are slowing down as we run out of things to convert, but we're a ways from done still. - Dan's "maintainer profile entry" work landed at last. Now we just need to get maintainers to fill in the profiles... - A reworking of the parallel build setup to work better with a variety of systems (and to not take over huge systems entirely in particular). - The MAINTAINERS file is now converted to RST during the build. Hopefully nobody ever tries to print this thing, or they will need to load a lot of paper. - A script and documentation making it easy for maintainers to add Link: tags at commit time. Also included is the removal of a bunch of spurious CR characters" * tag 'docs-5.5a' of git://git.lwn.net/linux: (91 commits) docs: remove a bunch of stray CRs docs: fix up the maintainer profile document libnvdimm, MAINTAINERS: Maintainer Entry Profile Maintainer Handbook: Maintainer Entry Profile MAINTAINERS: Reclaim the P: tag for Maintainer Entry Profile docs, parallelism: Rearrange how jobserver reservations are made docs, parallelism: Do not leak blocking mode to other readers docs, parallelism: Fix failure path and add comment Documentation: Remove bootmem_debug from kernel-parameters.txt Documentation: security: core.rst: fix warnings Documentation/process/howto/kokr: Update for 4.x -> 5.x versioning Documentation/translation: Use Korean for Korean translation title docs/memory-barriers.txt: Remove remaining references to mmiowb() docs/memory-barriers.txt/kokr: Update I/O section to be clearer about CPU vs thread docs/memory-barriers.txt/kokr: Fix style, spacing and grammar in I/O section Documentation/kokr: Kill all references to mmiowb() docs/memory-barriers.txt/kokr: Rewrite "KERNEL I/O BARRIER EFFECTS" section docs: Add initial documentation for devfreq Documentation: Document how to get links with git am docs: Add request_irq() documentation ...
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@@ -19,7 +19,9 @@ devices/imx8_ddr0/format/. The "events" directory describes the events types
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hardware supported that can be used with perf tool, see /sys/bus/event_source/
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devices/imx8_ddr0/events/. The "caps" directory describes filter features implemented
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in DDR PMU, see /sys/bus/events_source/devices/imx8_ddr0/caps/.
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e.g.::
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.. code-block:: bash
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perf stat -a -e imx8_ddr0/cycles/ cmd
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perf stat -a -e imx8_ddr0/read/,imx8_ddr0/write/ cmd
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@@ -35,24 +37,31 @@ value 1 for supported.
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Filter is defined with two configuration parts:
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--AXI_ID defines AxID matching value.
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--AXI_MASKING defines which bits of AxID are meaningful for the matching.
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0:corresponding bit is masked.
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1: corresponding bit is not masked, i.e. used to do the matching.
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- 0: corresponding bit is masked.
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- 1: corresponding bit is not masked, i.e. used to do the matching.
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AXI_ID and AXI_MASKING are mapped on DPCR1 register in performance counter.
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When non-masked bits are matching corresponding AXI_ID bits then counter is
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incremented. Perf counter is incremented if
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AxID && AXI_MASKING == AXI_ID && AXI_MASKING
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AxID && AXI_MASKING == AXI_ID && AXI_MASKING
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This filter doesn't support filter different AXI ID for axid-read and axid-write
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event at the same time as this filter is shared between counters.
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e.g.::
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perf stat -a -e imx8_ddr0/axid-read,axi_mask=0xMMMM,axi_id=0xDDDD/ cmd
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perf stat -a -e imx8_ddr0/axid-write,axi_mask=0xMMMM,axi_id=0xDDDD/ cmd
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NOTE: axi_mask is inverted in userspace(i.e. set bits are bits to mask), and
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it will be reverted in driver automatically. so that the user can just specify
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axi_id to monitor a specific id, rather than having to specify axi_mask.
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e.g.::
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.. code-block:: bash
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perf stat -a -e imx8_ddr0/axid-read,axi_mask=0xMMMM,axi_id=0xDDDD/ cmd
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perf stat -a -e imx8_ddr0/axid-write,axi_mask=0xMMMM,axi_id=0xDDDD/ cmd
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.. note::
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axi_mask is inverted in userspace(i.e. set bits are bits to mask), and
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it will be reverted in driver automatically. so that the user can just specify
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axi_id to monitor a specific id, rather than having to specify axi_mask.
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.. code-block:: bash
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perf stat -a -e imx8_ddr0/axid-read,axi_id=0x12/ cmd, which will monitor ARID=0x12
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* With DDR_CAP_AXI_ID_FILTER_ENHANCED quirk(filter: 1, enhanced_filter: 1).
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