linux-kernel - Re: [PATCHv1 4/5] arm64: dts: amlogic: Add cache information to the Amlogic S922X SoC

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Date: Tue, 6 Feb 2024 15:45:16 +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 4/5] arm64: dts: amlogic: Add cache information to the
 Amlogic S922X SoC

Hi Neil,

On Tue, 6 Feb 2024 at 14:30, Neil Armstrong <neil.armstrong@...aro.org> wrote:
>
> On 05/02/2024 18:19, Anand Moon wrote:
> > As per S922X datasheet add missing cache information to the Amlogic
> > S922X SoC.
> >
> > - Each Cortex-A53 core has 32 KB of instruction cache and
> >       32 KB of L1 data cache available.
> > - Each Cortex-A73 core has 64 KB of L1 instruction cache and
> >       64 KB of L1 data cache available.
> > - The little (A53) cluster has 512 KB of unified L2 cache available.
> > - The big (A73) cluster has 1 MB of unified L2 cache available.
>
> Datasheet says:
> The quad core Cortex™-A73 processor is paired with A53 processor in a big.Little configuration, with each
> core has L1 instruction and data chaches, together with a single shared L2 unified cache with A53
>
Ok,

Since all the Cortex™-A73 and Cortex™-A53 share some improvements in
the architecture with some improvements in cache features
hence I update the changes accordingly.
Also, I checked this in the ARM documentation earlier on this.

> And there's no indication of the L1 or L2 cache sizes.

What I feel is in general all the Cortex™-A73 and Cortex™-A53 supports
L1 and L2 cache size since it is part of the core features.
but I opted for these size values from a Wikipedia article.

On my Odroid N2+, I observe the following.

I have also done some testing on the stress-ng to verify this.

alarm@...hl-on2:~$ lscpu
Architecture:           aarch64
  CPU op-mode(s):       32-bit, 64-bit
  Byte Order:           Little Endian
CPU(s):                 6
  On-line CPU(s) list:  0-5
Vendor ID:              ARM
  Model name:           Cortex-A53
    Model:              4
    Thread(s) per core: 1
    Core(s) per socket: 2
    Socket(s):          1
    Stepping:           r0p4
    CPU(s) scaling MHz: 100%
    CPU max MHz:        1800.0000
    CPU min MHz:        1000.0000
    BogoMIPS:           48.00
    Flags:              fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
  Model name:           Cortex-A73
    Model:              2
    Thread(s) per core: 1
    Core(s) per socket: 4
    Socket(s):          1
    Stepping:           r0p2
    CPU(s) scaling MHz: 63%
    CPU max MHz:        2208.0000
    CPU min MHz:        1000.0000
    BogoMIPS:           48.00
    Flags:              fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
Caches (sum of all):
  L1d:                  320 KiB (6 instances)
  L1i:                  320 KiB (6 instances)
  L2:                   1.5 MiB (2 instances)
NUMA:
  NUMA node(s):         1
  NUMA node0 CPU(s):    0-5
Vulnerabilities:
  Gather data sampling: Not affected
  Itlb multihit:        Not affected
  L1tf:                 Not affected
  Mds:                  Not affected
  Meltdown:             Not affected
  Mmio stale data:      Not affected
  Retbleed:             Not affected
  Spec rstack overflow: Not affected
  Spec store bypass:    Vulnerable
  Spectre v1:           Mitigation; __user pointer sanitization
  Spectre v2:           Vulnerable
  Srbds:                Not affected
  Tsx async abort:      Not affected
alarm@...hl-on2:~$

alarm@...hl-on2:~$ lstopo-no-graphics
Machine (3659MB total)
  Package L#0
    NUMANode L#0 (P#0 3659MB)
    L2 L#0 (512KB)
      L1d L#0 (32KB) + L1i L#0 (32KB) + Core L#0 + PU L#0 (P#0)
      L1d L#1 (32KB) + L1i L#1 (32KB) + Core L#1 + PU L#1 (P#1)
    L2 L#1 (1024KB)
      L1d L#2 (64KB) + L1i L#2 (64KB) + Core L#2 + PU L#2 (P#2)
      L1d L#3 (64KB) + L1i L#3 (64KB) + Core L#3 + PU L#3 (P#3)
      L1d L#4 (64KB) + L1i L#4 (64KB) + Core L#4 + PU L#4 (P#4)
      L1d L#5 (64KB) + L1i L#5 (64KB) + Core L#5 + PU L#5 (P#5)
  Block "mmcblk1boot0"
  Block "mmcblk1boot1"
  Block "mmcblk1"
  Net "eth0"

 >
> Neil
>

Thanks
-Anand