Re: [Qemu-devel] [PATCH v4 09/20] hw/arm/virt-acpi-build: Generate GTDT table

[Alex Bennée]

Shannon Zhao <address@hidden> writes:

> From: Shannon Zhao <address@hidden>
>
> ACPI v5.1 defines GTDT for ARM devices as a place to describe timer
> related information in the system. The Arch Timer interrupts must
> be provided for GTDT.
>
> Signed-off-by: Shannon Zhao <address@hidden>
> Signed-off-by: Shannon Zhao <address@hidden>
> ---
>  hw/arm/virt-acpi-build.c    | 30 ++++++++++++++++++++++++++++++
>  include/hw/acpi/acpi-defs.h | 37 +++++++++++++++++++++++++++++++++++++
>  2 files changed, 67 insertions(+)
>
> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index c8245ef..a7aba75 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -176,6 +176,33 @@ static void acpi_dsdt_add_virtio(Aml *scope, const 
> hwaddr *mmio_addrs,
>      }
>  }
>  
> +/* GTDT */
> +static void
> +build_gtdt(GArray *table_data, GArray *linker, VirtGuestInfo *guest_info)
> +{
> +    int gtdt_start = table_data->len;
> +    const struct acpi_gtdt_info *info = guest_info->gtdt_info;
> +    AcpiGenericTimerTable *gtdt;
> +
> +    gtdt = acpi_data_push(table_data, sizeof *gtdt);
> +    /* The interrupt values are the same with the device tree when adding 16 
> */
> +    gtdt->secure_el1_interrupt = info->timer_s_el1;
> +    gtdt->secure_el1_flags = ACPI_EDGE_SENSITIVE;
> +
> +    gtdt->non_secure_el1_interrupt = info->timer_ns_el1;
> +    gtdt->non_secure_el1_flags = ACPI_EDGE_SENSITIVE;
> +
> +    gtdt->virtual_timer_interrupt = info->timer_virt;
> +    gtdt->virtual_timer_flags = ACPI_EDGE_SENSITIVE;
> +
> +    gtdt->non_secure_el2_interrupt = info->timer_ns_el2;
> +    gtdt->non_secure_el2_flags = ACPI_EDGE_SENSITIVE;
> +
> +    build_header(linker, table_data,
> +                 (void *)(table_data->data + gtdt_start), "GTDT",
> +                 table_data->len - gtdt_start, 1);
> +}
> +
>  /* MADT */
>  static void
>  build_madt(GArray *table_data, GArray *linker, VirtGuestInfo *guest_info,
> @@ -318,6 +345,9 @@ void virt_acpi_build(VirtGuestInfo *guest_info, 
> AcpiBuildTables *tables)
>      acpi_add_table(table_offsets, tables_blob);
>      build_madt(tables_blob, tables->linker, guest_info, &cpuinfo);
>  
> +    acpi_add_table(table_offsets, tables_blob);
> +    build_gtdt(tables_blob, tables->linker, guest_info);
> +
>      /* Cleanup memory that's no longer used. */
>      g_array_free(table_offsets, true);
>  }
> diff --git a/include/hw/acpi/acpi-defs.h b/include/hw/acpi/acpi-defs.h
> index e343728..ee40a5e 100644
> --- a/include/hw/acpi/acpi-defs.h
> +++ b/include/hw/acpi/acpi-defs.h
> @@ -318,6 +318,43 @@ struct AcpiMadtGenericDistributor {
>  typedef struct AcpiMadtGenericDistributor AcpiMadtGenericDistributor;
>  
>  /*
> + * Generic Timer Description Table (GTDT)
> + */
> +
> +#define ACPI_GTDT_INTERRUPT_MODE        (1)

(1 << 0) would be consistent 

> +#define ACPI_GTDT_INTERRUPT_POLARITY    (1<<1)
> +#define ACPI_GTDT_ALWAYS_ON             (1<<2)

Also spaces (n << m)

> +
> +/* Triggering */
> +
> +#define ACPI_LEVEL_SENSITIVE            (uint8_t) 0x00
> +#define ACPI_EDGE_SENSITIVE             (uint8_t) 0x01
> +
> +/* Polarity */
> +
> +#define ACPI_ACTIVE_HIGH                (uint8_t) 0x00
> +#define ACPI_ACTIVE_LOW                 (uint8_t) 0x01
> +#define ACPI_ACTIVE_BOTH                (uint8_t) 0x02

I'd wrap those cast defines, e.g:

    #define ACPI_ACTIVE_BOTH                ((uint8_t) 0x02)

> +
> +struct AcpiGenericTimerTable {
> +    ACPI_TABLE_HEADER_DEF
> +    uint64_t counter_block_addresss;
> +    uint32_t reserved;
> +    uint32_t secure_el1_interrupt;
> +    uint32_t secure_el1_flags;
> +    uint32_t non_secure_el1_interrupt;
> +    uint32_t non_secure_el1_flags;
> +    uint32_t virtual_timer_interrupt;
> +    uint32_t virtual_timer_flags;
> +    uint32_t non_secure_el2_interrupt;
> +    uint32_t non_secure_el2_flags;
> +    uint64_t counter_read_block_address;
> +    uint32_t platform_timer_count;
> +    uint32_t platform_timer_offset;
> +} QEMU_PACKED;
> +typedef struct AcpiGenericTimerTable AcpiGenericTimerTable;
> +
> +/*
>   * HPET Description Table
>   */
>  struct Acpi20Hpet {

-- 
Alex Bennée