€•¹'Œsphinx.addnodes”Œdocument”“”)”}”(Œ rawsource”Œ”Œchildren”]”(Œ translations”Œ LanguagesNode”“”)”}”(hhh]”(hŒ pending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ refdomain”Œstd”Œreftype”Œdoc”Œ reftarget”Œ,/translations/zh_CN/admin-guide/perf/arm-ccn”Œmodname”NŒ classname”NŒ refexplicit”ˆuŒtagname”hhh ubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ,/translations/zh_TW/admin-guide/perf/arm-ccn”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ,/translations/it_IT/admin-guide/perf/arm-ccn”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ,/translations/ja_JP/admin-guide/perf/arm-ccn”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ,/translations/ko_KR/admin-guide/perf/arm-ccn”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ,/translations/sp_SP/admin-guide/perf/arm-ccn”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h hhŒ _document”hŒsource”NŒline”NubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒARM Cache Coherent Network”h]”hŒARM Cache Coherent Network”…””}”(hh¨hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hh£hžhhŸŒF/var/lib/git/docbuild/linux/Documentation/admin-guide/perf/arm-ccn.rst”h KubhŒ paragraph”“”)”}”(hŒÛCCN-504 is a ring-bus interconnect consisting of 11 crosspoints (XPs), with each crosspoint supporting up to two device ports, so nodes (devices) 0 and 1 are connected to crosspoint 0, nodes 2 and 3 to crosspoint 1 etc.”h]”hŒÛCCN-504 is a ring-bus interconnect consisting of 11 crosspoints (XPs), with each crosspoint supporting up to two device ports, so nodes (devices) 0 and 1 are connected to crosspoint 0, nodes 2 and 3 to crosspoint 1 etc.”…””}”(hh¹hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubh¢)”}”(hhh]”(h§)”}”(hŒPMU (perf) driver”h]”hŒPMU (perf) driver”…””}”(hhÊhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hhÇhžhhŸh¶h K ubh¸)”}”(hŒ¦The CCN driver registers a perf PMU driver, which provides description of available events and configuration options in sysfs, see /sys/bus/event_source/devices/ccn*.”h]”hŒ¦The CCN driver registers a perf PMU driver, which provides description of available events and configuration options in sysfs, see /sys/bus/event_source/devices/ccn*.”…””}”(hhØhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K hhÇhžhubh¸)”}”(hX\The "format" directory describes format of the config, config1 and config2 fields of the perf_event_attr structure. The "events" directory provides configuration templates for all documented events, that can be used with perf tool. For example "xp_valid_flit" is an equivalent of "type=0x8,event=0x4". Other parameters must be explicitly specified.”h]”hXlThe “format†directory describes format of the config, config1 and config2 fields of the perf_event_attr structure. The “events†directory provides configuration templates for all documented events, that can be used with perf tool. For example “xp_valid_flit†is an equivalent of “type=0x8,event=0x4â€. Other parameters must be explicitly specified.”…””}”(hhæhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KhhÇhžhubh¸)”}”(hŒ=For events originating from device, "node" defines its index.”h]”hŒAFor events originating from device, “node†defines its index.”…””}”(hhôhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KhhÇhžhubh¸)”}”(hŒ]Crosspoint PMU events require "xp" (index), "bus" (bus number) and "vc" (virtual channel ID).”h]”hŒiCrosspoint PMU events require “xp†(index), “bus†(bus number) and “vc†(virtual channel ID).”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KhhÇhžhubh¸)”}”(hŒûCrosspoint watchpoint-based events (special "event" value 0xfe) require "xp" and "vc" as above plus "port" (device port index), "dir" (transmit/receive direction), comparator values ("cmp_l" and "cmp_h") and "mask", being index of the comparator mask.”h]”hXCrosspoint watchpoint-based events (special “event†value 0xfe) require “xp†and “vc†as above plus “port†(device port index), “dir†(transmit/receive direction), comparator values (“cmp_l†and “cmp_hâ€) and “maskâ€, being index of the comparator mask.”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KhhÇhžhubh¸)”}”(hŒßMasks are defined separately from the event description (due to limited number of the config values) in the "cmp_mask" directory, with first 8 configurable by user and additional 4 hardcoded for the most frequent use cases.”h]”hŒãMasks are defined separately from the event description (due to limited number of the config values) in the “cmp_mask†directory, with first 8 configurable by user and additional 4 hardcoded for the most frequent use cases.”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K"hhÇhžhubh¸)”}”(hŒZCycle counter is described by a "type" value 0xff and does not require any other settings.”h]”hŒ^Cycle counter is described by a “type†value 0xff and does not require any other settings.”…””}”(hj,hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K'hhÇhžhubh¸)”}”(hX›The driver also provides a "cpumask" sysfs attribute, which contains a single CPU ID, of the processor which will be used to handle all the CCN PMU events. It is recommended that the user space tools request the events on this processor (if not, the perf_event->cpu value will be overwritten anyway). In case of this processor being offlined, the events are migrated to another one and the attribute is updated.”h]”hXŸThe driver also provides a “cpumask†sysfs attribute, which contains a single CPU ID, of the processor which will be used to handle all the CCN PMU events. It is recommended that the user space tools request the events on this processor (if not, the perf_event->cpu value will be overwritten anyway). In case of this processor being offlined, the events are migrated to another one and the attribute is updated.”…””}”(hj:hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K*hhÇhžhubh¸)”}”(hŒExample of perf tool use::”h]”hŒExample of perf tool use:”…””}”(hjHhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K1hhÇhžhubhŒ literal_block”“”)”}”(hXP/ # perf list | grep ccn ccn/cycles/ [Kernel PMU event] <...> ccn/xp_valid_flit,xp=?,port=?,vc=?,dir=?/ [Kernel PMU event] <...> / # perf stat -a -e ccn/cycles/,ccn/xp_valid_flit,xp=1,port=0,vc=1,dir=1/ \ sleep 1”h]”hXP/ # perf list | grep ccn ccn/cycles/ [Kernel PMU event] <...> ccn/xp_valid_flit,xp=?,port=?,vc=?,dir=?/ [Kernel PMU event] <...> / # perf stat -a -e ccn/cycles/,ccn/xp_valid_flit,xp=1,port=0,vc=1,dir=1/ \ sleep 1”…””}”hjXsbah}”(h]”h ]”h"]”h$]”h&]”Œ xml:space”Œpreserve”uh1jVhŸh¶h K3hhÇhžhubh¸)”}”(hŒ…The driver does not support sampling, therefore "perf record" will not work. Per-task (without "-a") perf sessions are not supported.”h]”hŒThe driver does not support sampling, therefore “perf record†will not work. Per-task (without “-aâ€) perf sessions are not supported.”…””}”(hjhhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K