Re: [PATCH v5 08/10] x86: acpi: introduce the PCI0.SMI0 ACPI device

[Laszlo Ersek <lersek@redhat.com>]

On 09/07/20 13:23, Igor Mammedov wrote:
> When CPU hotplug with SMI has been negotiated, describe the SMI
> register block in the DSDT. Pass the ACPI name of the SMI control
> register to build_cpus_aml(), so that CPU_SCAN_METHOD can access the
> register in the next patch.
> 
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
> ---
>  include/hw/acpi/cpu.h |  1 +
>  hw/i386/acpi-build.c  | 29 ++++++++++++++++++++++++++++-
>  2 files changed, 29 insertions(+), 1 deletion(-)
> 
> diff --git a/include/hw/acpi/cpu.h b/include/hw/acpi/cpu.h
> index 62f0278ba2..0eeedaa491 100644
> --- a/include/hw/acpi/cpu.h
> +++ b/include/hw/acpi/cpu.h
> @@ -50,6 +50,7 @@ void cpu_hotplug_hw_init(MemoryRegion *as, Object *owner,
>  typedef struct CPUHotplugFeatures {
>      bool acpi_1_compatible;
>      bool has_legacy_cphp;
> +    const char *smi_path;
>  } CPUHotplugFeatures;
>  
>  void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index e61c17a484..7a33ef193e 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -1521,6 +1521,32 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
>          aml_append(dev, aml_name_decl("_UID", aml_int(0)));
>          aml_append(dev, build_q35_osc_method());
>          aml_append(sb_scope, dev);
> +
> +        if (pm->smi_on_cpuhp) {
> +            /* reserve SMI block resources, IO ports 0xB2, 0xB3 */
> +            dev = aml_device("PCI0.SMI0");
> +            aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A06")));
> +            aml_append(dev, aml_name_decl("_UID", aml_string("SMI resources")));
> +            crs = aml_resource_template();
> +            aml_append(crs,
> +                aml_io(
> +                       AML_DECODE16,
> +                       ACPI_PORT_SMI_CMD,
> +                       ACPI_PORT_SMI_CMD,
> +                       1,
> +                       2)
> +            );
> +            aml_append(dev, aml_name_decl("_CRS", crs));
> +            aml_append(dev, aml_operation_region("SMIR", AML_SYSTEM_IO,
> +                aml_int(ACPI_PORT_SMI_CMD), 2));
> +            field = aml_field("SMIR", AML_BYTE_ACC, AML_NOLOCK,
> +                              AML_WRITE_AS_ZEROS);
> +            aml_append(field, aml_named_field("SMIC", 8));
> +            aml_append(field, aml_reserved_field(8));
> +            aml_append(dev, field);
> +            aml_append(sb_scope, dev);
> +        }
> +
>          aml_append(dsdt, sb_scope);
>  
>          build_hpet_aml(dsdt);
> @@ -1536,7 +1562,8 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
>          build_legacy_cpu_hotplug_aml(dsdt, machine, pm->cpu_hp_io_base);
>      } else {
>          CPUHotplugFeatures opts = {
> -            .acpi_1_compatible = true, .has_legacy_cphp = true
> +            .acpi_1_compatible = true, .has_legacy_cphp = true,
> +            .smi_path = pm->smi_on_cpuhp ? "\\_SB.PCI0.SMI0.SMIC" : NULL,
>          };
>          build_cpus_aml(dsdt, machine, opts, pm->cpu_hp_io_base,
>                         "\\_SB.PCI0", "\\_GPE._E02");
> 

Tested-by: Laszlo Ersek <lersek@redhat.com>