Re: [PATCH v3 4/4] arm/acpi: Add the TPM2.0 device under the DSDT

[Igor Mammedov <imammedo@redhat.com>]

On Mon,  1 Jun 2020 11:57:37 +0200
Eric Auger <eric.auger@redhat.com> wrote:

> In case it is dynamically instantiated, add the TPM 2.0 device object
> under the DSDT table in the ACPI namespace. Its HID is MSFT0101
> while its current resource settings (CRS) property is initialized
> with the guest physical address and MMIO size of the device.
> 
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
> 
> ---
> 
> v2 -> v3:
> - use SYS_BUS_DEVICE() instead of
>   (SysBusDevice *)object_dynamic_cast(OBJECT())
> 
> v1 -> v2:
> - use memory_region_size
> - fix mingw compilation issue by casting to uint32_t
> - added Stefan's R-b
> ---
>  hw/arm/virt-acpi-build.c | 32 ++++++++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index 6d152ab481..05a3028500 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -46,6 +46,7 @@
>  #include "hw/pci/pci.h"
>  #include "hw/arm/virt.h"
>  #include "hw/mem/nvdimm.h"
> +#include "hw/platform-bus.h"
>  #include "sysemu/numa.h"
>  #include "sysemu/reset.h"
>  #include "sysemu/tpm.h"
> @@ -364,6 +365,36 @@ static void acpi_dsdt_add_power_button(Aml *scope)
>      aml_append(scope, dev);
>  }
>  
> +static void acpi_dsdt_add_tpm(Aml *scope, VirtMachineState *vms)
> +{
> +    hwaddr pbus_base = vms->memmap[VIRT_PLATFORM_BUS].base;
> +    PlatformBusDevice *pbus = PLATFORM_BUS_DEVICE(vms->platform_bus_dev);
> +    MemoryRegion *sbdev_mr;
> +    SysBusDevice *sbdev;
> +    hwaddr tpm_base;
> +
> +    sbdev = SYS_BUS_DEVICE(tpm_find());
> +
> +    tpm_base = platform_bus_get_mmio_addr(pbus, sbdev, 0);
> +    assert(tpm_base != -1);
> +
> +    tpm_base += pbus_base;
> +
> +    sbdev_mr = sysbus_mmio_get_region(sbdev, 0);
> +
> +    Aml *dev = aml_device("TPM0");
> +    aml_append(dev, aml_name_decl("_HID", aml_string("MSFT0101")));
> +    aml_append(dev, aml_name_decl("_UID", aml_int(0)));
> +
> +    Aml *crs = aml_resource_template();
> +    aml_append(crs,
> +               aml_memory32_fixed(tpm_base,
> +                                  (uint32_t)memory_region_size(sbdev_mr),
> +                                  AML_READ_WRITE));
> +    aml_append(dev, aml_name_decl("_CRS", crs));
> +    aml_append(scope, dev);
> +}
> +
>  static void
>  build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
>  {
> @@ -758,6 +789,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
>      }
>  
>      acpi_dsdt_add_power_button(scope);
> +    acpi_dsdt_add_tpm(scope, vms);
shouldn't be this guarded by check if TPM device is present?

perhaps pass found here tpm to acpi_dsdt_add_tpm() as an argument

>  
>      aml_append(dsdt, scope);
>