Re: [PATCH v2] mfd: loongson-se: Add multi-node support

[Qunqin Zhao]

在 2026/4/27 下午6:02, Huacai Chen 写道:
> On Mon, Apr 27, 2026 at 5:52 PM Qunqin Zhao <zhaoqunqin@xxxxxxxxxxx> wrote:
> > 在 2026/4/27 下午5:37, Huacai Chen 写道:
> > > On Mon, Apr 27, 2026 at 5:24 PM Qunqin Zhao <zhaoqunqin@xxxxxxxxxxx> wrote:
> > > > 在 2026/4/27 下午5:02, Huacai Chen 写道:
> > > > > Hi, Qunqin,
> > > > >
> > > > > On Mon, Apr 27, 2026 at 4:55 PM Qunqin Zhao <zhaoqunqin@xxxxxxxxxxx> wrote:
> > > > > > On the Loongson platform, each node is equipped with a security engine
> > > > > > device. However, due to a hardware flaw, only the device on node 0 can
> > > > > > trigger interrupts. Therefore, interrupts from other nodes are forwarded
> > > > > > by node 0. We need to check in the interrupt handler of node 0 whether
> > > > > > this interrupt is intended for other nodes.
> > > > > Multi-node or multi-package? In my opinion SE has no relationship with
> > > > > NUMA node, so maybe package?
> > > > Here is the output of lscpu from my machine:
> > > >
> > > > [loongson@localhost ~]$ lscpu
> > > > Architecture:          loongarch64
> > > >      CPU op-mode(s):      32-bit, 64-bit
> > > >      Address sizes:       48 bits physical, 48 bits virtual
> > > >      Byte Order:          Little Endian
> > > > CPU(s):                128
> > > >      On-line CPU(s) list: 0-127
> > > > Model name:            Loongson-3C6000/D
> > > >      CPU family:          Loongson-64bit
> > > >      Model:               0x11
> > > >      Thread(s) per core:  2
> > > >      Core(s) per socket:  32
> > > >      Socket(s):           2
> > > >      BogoMIPS:            4200.00
> > > >      Flags:               cpucfg lam ual fpu lsx lasx crc32 complex crypto
> > > > lvz lbt_x86 lbt_arm lbt_mips
> > > > Caches (sum of all):
> > > >      L1d:                 4 MiB (64 instances)
> > > >      L1i:                 4 MiB (64 instances)
> > > >      L2:                  16 MiB (64 instances)
> > > >      L3:                  128 MiB (4 instances)
> > > > NUMA:
> > > >      NUMA node(s):        4
> > > >      NUMA node0 CPU(s):   0-31
> > > >      NUMA node1 CPU(s):   32-63
> > > >      NUMA node2 CPU(s):   64-95
> > > >      NUMA node3 CPU(s):   96-127
> > > >
> > > > There are four SE devices in my system, one for each NUMA node.
> > > For Loongson-3C6000 node is the same as package. You should consider
> > > Loongson-3C5000L, one package contains four nodes.
> > I am not familiar with the SE-related components on the 3C5000L, and
> > this driver is not compatible with the 5000 series.
> Whether it is compatible to Loongson-3C5000L is not important. The
> importance is package is not always equal to node, and we should
> consider whether SE is per-node or per-package.

Hi, huacai

After consulting with  hardware team, I learned that while the 3C5000L
has four SE devices, only one is utilized due to interrupt constraints.

Thanks,

Qunqin

> Huacai