linux-kernel - Re: [PATCHv1 2/5] arm64: dts: amlogic: Add cache information to the Amlogic SM1 SoC

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Date: Tue, 27 Feb 2024 18:33:20 +0530
From: Anand Moon <linux.amoon@...il.com>
To: neil.armstrong@...aro.org
Cc: Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Kevin Hilman <khilman@...libre.com>, Jerome Brunet <jbrunet@...libre.com>, 
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>, devicetree@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-amlogic@...ts.infradead.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv1 2/5] arm64: dts: amlogic: Add cache information to the
 Amlogic SM1 SoC

Hi Neil,

On Tue, 6 Feb 2024 at 14:24, Neil Armstrong <neil.armstrong@...aro.org> wrote:
>
> On 05/02/2024 18:19, Anand Moon wrote:
> > As per S905X3 datasheet add missing cache information to the Amlogic
> > SM1 SoC. ARM Cortex-A55 CPU uses unified L3 cache instead of L2 cache.
> >
> > - Each Cortex-A55 core has 32KB of L1 instruction cache available and
> >       32KB of L1 data cache available.
> > - Along with 512KB Unified L3 cache.
>
> This 512K number is for the NPU, AFAIK the CPU L3 Cache size isn't specified in the datasheet
>
OK,

As per Arm Cotex A55 TRM it supports cache.
[0] https://developer.arm.com/documentation/100442/0200/Functional-description/Introduction-to-the-Cortex-A55-core/Implementation-options

As per the datasheet
[1] https://dn.odroid.com/S905X3/ODROID-C4/Docs/S905X3_Public_Datasheet_Hardkernel.pdf

TheCortex™-A55M subsystem of the chipisa high-performance,
low-power,ARM macro cell with an L1 and L3
cache sub system that provide full virtual memory capabilities.

Best way to let the Amlogic SoC members comment on the CPU  L1/ //L2/
L3 cache size.
But with the lack of pref PMU events we cannot test this feature.

[root@...oid-c4 alarm]# perf list

List of pre-defined events (to be used in -e or -M):

  alignment-faults                                   [Software event]
  bpf-output                                         [Software event]
  cgroup-switches                                    [Software event]
  context-switches OR cs                             [Software event]

List of pre-defined events (to be used in -e or -M):

  alignment-faults                                   [Software event]
  bpf-output                                         [Software event]
  cgroup-switches                                    [Software event]
  context-switches OR cs                             [Software event]
  cpu-clock                                          [Software event]
  cpu-migrations OR migrations                       [Software event]
  dummy                                              [Software event]
  emulation-faults                                   [Software event]
  major-faults                                       [Software event]
  minor-faults                                       [Software event]
  page-faults OR faults                              [Software event]
  task-clock                                         [Software event]
  duration_time                                      [Tool event]
  user_time                                          [Tool event]
  system_time                                        [Tool event]
  rNNN                                               [Raw hardware event descri>
  cpu/t1=v1[,t2=v2,t3 ...]/modifier                  [Raw hardware event descri>
       [(see 'man perf-list' on how to encode it)]
  mem:<addr>[/len][:access]                          [Hardware breakpoint]
  alarmtimer:alarmtimer_cancel                       [Tracepoint event]
  alarmtimer:alarmtimer_fired                        [Tracepoint event]
  alarmtimer:alarmtimer_start                        [Tracepoint event]
  alarmtimer:alarmtimer_suspend                      [Tracepoint event]
  asoc:snd_soc_bias_level_done                       [Tracepoint event]
  asoc:snd_soc_bias_level_start                      [Tracepoint event]
  asoc:snd_soc_dapm_connected                        [Tracepoint event]
  asoc:snd_soc_dapm_done                             [Tracepoint event]
  asoc:snd_soc_dapm_path                             [Tracepoint event]
  asoc:snd_soc_dapm_start                            [Tracepoint event]
  asoc:snd_soc_dapm_walk_done                        [Tracepoint event]
  asoc:snd_soc_dapm_widget_event_done                [Tracepoint event]
  asoc:snd_soc_dapm_widget_event_start               [Tracepoint event]
  asoc:snd_soc_dapm_widget_power                     [Tracepoint event]



Thanks



-Anand