Re: [RFC 25/52] mips: Replace MachineState.smp access with topology helpers

[Zhao Liu <zhao1.liu@linux.intel.com>]

On Tue, Feb 14, 2023 at 11:40:14AM +0800, Mi, Dapeng1 wrote:
> Date: Tue, 14 Feb 2023 11:40:14 +0800
> From: "Mi, Dapeng1" <dapeng1.mi@intel.com>
> Subject: RE: [RFC 25/52] mips: Replace MachineState.smp access with
>  topology helpers
> 
> > From: Zhao Liu <zhao1.liu@linux.intel.com>
> > Sent: Monday, February 13, 2023 5:50 PM
> > To: Eduardo Habkost <eduardo@habkost.net>; Marcel Apfelbaum
> > <marcel.apfelbaum@gmail.com>; Philippe Mathieu-Daud? <philmd@linaro.org>;
> > Yanan Wang <wangyanan55@huawei.com>; Michael S . Tsirkin
> > <mst@redhat.com>; Richard Henderson <richard.henderson@linaro.org>; Paolo
> > Bonzini <pbonzini@redhat.com>; Eric Blake <eblake@redhat.com>; Markus
> > Armbruster <armbru@redhat.com>
> > Cc: qemu-devel@nongnu.org; Wang, Zhenyu Z <zhenyu.z.wang@intel.com>; Mi,
> > Dapeng1 <dapeng1.mi@intel.com>; Ding, Zhuocheng
> > <zhuocheng.ding@intel.com>; Robert Hoo <robert.hu@linux.intel.com>;
> > Christopherson,, Sean <seanjc@google.com>; Like Xu
> > <like.xu.linux@gmail.com>; Liu, Zhao1 <zhao1.liu@intel.com>; Aleksandar
> > Rikalo <aleksandar.rikalo@syrmia.com>; Huacai Chen
> > <chenhuacai@kernel.org>; Jiaxun Yang <jiaxun.yang@flygoat.com>; Aurelien
> > Jarno <aurelien@aurel32.net>
> > Subject: [RFC 25/52] mips: Replace MachineState.smp access with topology
> > helpers
> > 
> > From: Zhao Liu <zhao1.liu@intel.com>
> > 
> > When MachineState.topo is introduced, the topology related structures
> > become complicated. So we wrapped the access to topology fields of
> > MachineState.topo into some helpers, and we are using these helpers
> > to replace the use of MachineState.smp.
> > 
> > For mips, it's straightforward to replace topology access with wrapped
> > generic interfaces.
> > 
> > Cc: Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>
> > Cc: Huacai Chen <chenhuacai@kernel.org>
> > Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
> > Cc: Aurelien Jarno <aurelien@aurel32.net>
> > Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
> > ---
> >  hw/mips/boston.c          |  8 +++++---
> >  hw/mips/loongson3_bootp.c |  7 ++++---
> >  hw/mips/loongson3_virt.c  |  8 +++++---
> >  hw/mips/malta.c           | 10 ++++++----
> >  4 files changed, 20 insertions(+), 13 deletions(-)
> > 
> > diff --git a/hw/mips/boston.c b/hw/mips/boston.c
> > index a9d87f34378f..d02c88d769d4 100644
> > --- a/hw/mips/boston.c
> > +++ b/hw/mips/boston.c
> > @@ -514,7 +514,7 @@ static const void *create_fdt(BostonState *s,
> >                                const MemMapEntry *memmap, int *dt_size)
> >  {
> >      void *fdt;
> > -    int cpu;
> > +    int cpu, smp_cpus;
> >      MachineState *ms = s->mach;
> >      uint32_t platreg_ph, gic_ph, clk_ph;
> >      char *name, *gic_name, *platreg_name, *stdout_name;
> > @@ -542,7 +542,8 @@ static const void *create_fdt(BostonState *s,
> >      qemu_fdt_setprop_cell(fdt, "/cpus", "#size-cells", 0x0);
> >      qemu_fdt_setprop_cell(fdt, "/cpus", "#address-cells", 0x1);
> > 
> > -    for (cpu = 0; cpu < ms->smp.cpus; cpu++) {
> > +    smp_cpus = machine_topo_get_cpus(ms);
> > +    for (cpu = 0; cpu < smp_cpus; cpu++) {
> >          name = g_strdup_printf("/cpus/cpu@%d", cpu);
> >          qemu_fdt_add_subnode(fdt, name);
> >          qemu_fdt_setprop_string(fdt, name, "compatible", "img,mips");
> > @@ -702,7 +703,8 @@ static void boston_mach_init(MachineState *machine)
> >      object_initialize_child(OBJECT(machine), "cps", &s->cps, TYPE_MIPS_CPS);
> >      object_property_set_str(OBJECT(&s->cps), "cpu-type", machine->cpu_type,
> >                              &error_fatal);
> > -    object_property_set_int(OBJECT(&s->cps), "num-vp", machine->smp.cpus,
> > +    object_property_set_int(OBJECT(&s->cps), "num-vp",
> > +                            machine_topo_get_cpus(machine),
> >                              &error_fatal);
> 
> It's better move "&error_fatal);" to previous line.

Yes, this is no more than 80 characters.

> 
> >      qdev_connect_clock_in(DEVICE(&s->cps), "clk-in",
> >                            qdev_get_clock_out(dev, "cpu-refclk"));
> > diff --git a/hw/mips/loongson3_bootp.c b/hw/mips/loongson3_bootp.c
> > index f99af229327a..d9a92825ceae 100644
> > --- a/hw/mips/loongson3_bootp.c
> > +++ b/hw/mips/loongson3_bootp.c
> > @@ -40,9 +40,10 @@ static void init_cpu_info(void *g_cpuinfo, uint64_t
> > cpu_freq)
> >      }
> > 
> >      c->cpu_startup_core_id = cpu_to_le16(0);
> > -    c->nr_cpus = cpu_to_le32(current_machine->smp.cpus);
> > -    c->total_node = cpu_to_le32(DIV_ROUND_UP(current_machine->smp.cpus,
> > -                                             LOONGSON3_CORE_PER_NODE));
> > +    c->nr_cpus = cpu_to_le32(machine_topo_get_cpus(current_machine));
> > +    c->total_node =
> > +        cpu_to_le32(DIV_ROUND_UP(machine_topo_get_cpus(current_machine),
> > +                                 LOONGSON3_CORE_PER_NODE));
> >  }
> > 
> >  static void init_memory_map(void *g_map, uint64_t ram_size)
> > diff --git a/hw/mips/loongson3_virt.c b/hw/mips/loongson3_virt.c
> > index 25534288dd81..c972bb43a1f7 100644
> > --- a/hw/mips/loongson3_virt.c
> > +++ b/hw/mips/loongson3_virt.c
> > @@ -271,8 +271,10 @@ static void fw_conf_init(unsigned long ram_size)
> >      hwaddr cfg_addr = virt_memmap[VIRT_FW_CFG].base;
> > 
> >      fw_cfg = fw_cfg_init_mem_wide(cfg_addr, cfg_addr + 8, 8, 0, NULL);
> > -    fw_cfg_add_i16(fw_cfg, FW_CFG_NB_CPUS, (uint16_t)current_machine-
> > >smp.cpus);
> > -    fw_cfg_add_i16(fw_cfg, FW_CFG_MAX_CPUS, (uint16_t)current_machine-
> > >smp.max_cpus);
> > +    fw_cfg_add_i16(fw_cfg, FW_CFG_NB_CPUS,
> > +                   (uint16_t)machine_topo_get_cpus(current_machine));
> > +    fw_cfg_add_i16(fw_cfg, FW_CFG_MAX_CPUS,
> > +                   (uint16_t)machine_topo_get_max_cpus(current_machine));
> >      fw_cfg_add_i64(fw_cfg, FW_CFG_RAM_SIZE, (uint64_t)ram_size);
> >      fw_cfg_add_i32(fw_cfg, FW_CFG_MACHINE_VERSION, 1);
> >      fw_cfg_add_i64(fw_cfg, FW_CFG_CPU_FREQ, get_cpu_freq_hz());
> > @@ -528,7 +530,7 @@ static void mips_loongson3_virt_init(MachineState
> > *machine)
> >      cpuclk = clock_new(OBJECT(machine), "cpu-refclk");
> >      clock_set_hz(cpuclk, DEF_LOONGSON3_FREQ);
> > 
> > -    for (i = 0; i < machine->smp.cpus; i++) {
> > +    for (i = 0; i < machine_topo_get_cpus(machine); i++) {
> >          int ip;
> > 
> >          /* init CPUs */
> > diff --git a/hw/mips/malta.c b/hw/mips/malta.c
> > index ec172b111ae4..b3322f74baf5 100644
> > --- a/hw/mips/malta.c
> > +++ b/hw/mips/malta.c
> > @@ -981,7 +981,7 @@ static uint64_t load_kernel(void)
> >  static void malta_mips_config(MIPSCPU *cpu)
> >  {
> >      MachineState *ms = MACHINE(qdev_get_machine());
> > -    unsigned int smp_cpus = ms->smp.cpus;
> > +    unsigned int smp_cpus = machine_topo_get_cpus(ms);
> >      CPUMIPSState *env = &cpu->env;
> >      CPUState *cs = CPU(cpu);
> > 
> > @@ -1045,7 +1045,7 @@ static void create_cpu_without_cps(MachineState
> > *ms, MaltaState *s,
> >      MIPSCPU *cpu;
> >      int i;
> > 
> > -    for (i = 0; i < ms->smp.cpus; i++) {
> > +    for (i = 0; i < machine_topo_get_cpus(ms); i++) {
> >          cpu = mips_cpu_create_with_clock(ms->cpu_type, s->cpuclk);
> > 
> >          /* Init internal devices */
> > @@ -1066,7 +1066,8 @@ static void create_cps(MachineState *ms, MaltaState
> > *s,
> >      object_initialize_child(OBJECT(s), "cps", &s->cps, TYPE_MIPS_CPS);
> >      object_property_set_str(OBJECT(&s->cps), "cpu-type", ms->cpu_type,
> >                              &error_fatal);
> > -    object_property_set_int(OBJECT(&s->cps), "num-vp", ms->smp.cpus,
> > +    object_property_set_int(OBJECT(&s->cps), "num-vp",
> > +                            machine_topo_get_cpus(ms),
> >                              &error_fatal);
> >      qdev_connect_clock_in(DEVICE(&s->cps), "clk-in", s->cpuclk);
> >      sysbus_realize(SYS_BUS_DEVICE(&s->cps), &error_fatal);
> > @@ -1080,7 +1081,8 @@ static void create_cps(MachineState *ms, MaltaState
> > *s,
> >  static void mips_create_cpu(MachineState *ms, MaltaState *s,
> >                              qemu_irq *cbus_irq, qemu_irq *i8259_irq)
> >  {
> > -    if ((ms->smp.cpus > 1) && cpu_type_supports_cps_smp(ms->cpu_type)) {
> > +    if ((machine_topo_get_cpus(ms) > 1) &&
> > +        cpu_type_supports_cps_smp(ms->cpu_type)) {
> >          create_cps(ms, s, cbus_irq, i8259_irq);
> >      } else {
> >          create_cpu_without_cps(ms, s, cbus_irq, i8259_irq);
> > --
> > 2.34.1
>