Re: [PATCH V15 5/7] hw/acpi: Update CPUs AML with cpu-(ctrl)dev change

[Igor Mammedov <imammedo@redhat.com>]

On Sat, 13 Jul 2024 19:25:14 +0100
Salil Mehta <salil.mehta@huawei.com> wrote:

> CPUs Control device(\\_SB.PCI0) register interface for the x86 arch is IO port
> based and existing CPUs AML code assumes _CRS objects would evaluate to a system
> resource which describes IO Port address. But on ARM arch CPUs control
> device(\\_SB.PRES) register interface is memory-mapped hence _CRS object should
> evaluate to system resource which describes memory-mapped base address. Update
> build CPUs AML function to accept both IO/MEMORY region spaces and accordingly
> update the _CRS object.
> 
> Co-developed-by: Keqian Zhu <zhukeqian1@huawei.com>
> Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
> Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
> Reviewed-by: Gavin Shan <gshan@redhat.com>
> Tested-by: Vishnu Pajjuri <vishnu@os.amperecomputing.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> Tested-by: Xianglai Li <lixianglai@loongson.cn>
> Tested-by: Miguel Luis <miguel.luis@oracle.com>
> Reviewed-by: Shaoqin Huang <shahuang@redhat.com>
> Tested-by: Zhao Liu <zhao1.liu@intel.com>

Reviewed-by: Igor Mammedov <imammedo@redhat.com>

> ---
>  hw/acpi/cpu.c         | 17 +++++++++++++----
>  hw/i386/acpi-build.c  |  3 ++-
>  include/hw/acpi/cpu.h |  5 +++--
>  3 files changed, 18 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/acpi/cpu.c b/hw/acpi/cpu.c
> index cf5e9183e4..5cb60ca8bc 100644
> --- a/hw/acpi/cpu.c
> +++ b/hw/acpi/cpu.c
> @@ -338,9 +338,10 @@ const VMStateDescription vmstate_cpu_hotplug = {
>  #define CPU_FW_EJECT_EVENT "CEJF"
>  
>  void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
> -                    build_madt_cpu_fn build_madt_cpu, hwaddr io_base,
> +                    build_madt_cpu_fn build_madt_cpu, hwaddr base_addr,
>                      const char *res_root,
> -                    const char *event_handler_method)
> +                    const char *event_handler_method,
> +                    AmlRegionSpace rs)
>  {
>      Aml *ifctx;
>      Aml *field;
> @@ -364,14 +365,22 @@ void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
>              aml_name_decl("_UID", aml_string("CPU Hotplug resources")));
>          aml_append(cpu_ctrl_dev, aml_mutex(CPU_LOCK, 0));
>  
> +        assert((rs == AML_SYSTEM_IO) || (rs == AML_SYSTEM_MEMORY));
> +
>          crs = aml_resource_template();
> -        aml_append(crs, aml_io(AML_DECODE16, io_base, io_base, 1,
> +        if (rs == AML_SYSTEM_IO) {
> +            aml_append(crs, aml_io(AML_DECODE16, base_addr, base_addr, 1,
>                                 ACPI_CPU_HOTPLUG_REG_LEN));
> +        } else if (rs == AML_SYSTEM_MEMORY) {
> +            aml_append(crs, aml_memory32_fixed(base_addr,
> +                               ACPI_CPU_HOTPLUG_REG_LEN, AML_READ_WRITE));
> +        }
> +
>          aml_append(cpu_ctrl_dev, aml_name_decl("_CRS", crs));
>  
>          /* declare CPU hotplug MMIO region with related access fields */
>          aml_append(cpu_ctrl_dev,
> -            aml_operation_region("PRST", AML_SYSTEM_IO, aml_int(io_base),
> +            aml_operation_region("PRST", rs, aml_int(base_addr),
>                                   ACPI_CPU_HOTPLUG_REG_LEN));
>  
>          field = aml_field("PRST", AML_BYTE_ACC, AML_NOLOCK,
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index f4e366f64f..5d4bd2b710 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -1536,7 +1536,8 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
>              .fw_unplugs_cpu = pm->smi_on_cpu_unplug,
>          };
>          build_cpus_aml(dsdt, machine, opts, pc_madt_cpu_entry,
> -                       pm->cpu_hp_io_base, "\\_SB.PCI0", "\\_GPE._E02");
> +                       pm->cpu_hp_io_base, "\\_SB.PCI0", "\\_GPE._E02",
> +                       AML_SYSTEM_IO);
>      }
>  
>      if (pcms->memhp_io_base && nr_mem) {
> diff --git a/include/hw/acpi/cpu.h b/include/hw/acpi/cpu.h
> index df87b15997..32654dc274 100644
> --- a/include/hw/acpi/cpu.h
> +++ b/include/hw/acpi/cpu.h
> @@ -63,9 +63,10 @@ typedef void (*build_madt_cpu_fn)(int uid, const CPUArchIdList *apic_ids,
>                                    GArray *entry, bool force_enabled);
>  
>  void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
> -                    build_madt_cpu_fn build_madt_cpu, hwaddr io_base,
> +                    build_madt_cpu_fn build_madt_cpu, hwaddr base_addr,
>                      const char *res_root,
> -                    const char *event_handler_method);
> +                    const char *event_handler_method,
> +                    AmlRegionSpace rs);
>  
>  void acpi_cpu_ospm_status(CPUHotplugState *cpu_st, ACPIOSTInfoList ***list);
>