Re: [Qemu-devel] [V3 3/4] hw/i386: ACPI table for AMD IO MMU

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Jan 14, 2016 at 11:04:27AM +0300, David Kiarie wrote:
> Add IVRS table for AMD IO MMU. Also reverve MMIO

reserve?

> region for IO MMU via ACPI


It does not look like you reserve anything.

Pls add a link to hardware spec (in
the device implementation) so we can check
what does real hardware do.

If this is it:
http://developer.amd.com/wordpress/media/2012/10/488821.pdf

then the way that works seems to be by guest
programming the MMIO base.
We should do the same: patch seabios and EFI to do this.

> Signed-off-by: David Kiarie <davidkiarie4@gmail.com>
> ---
>  hw/i386/acpi-build.c        | 96 +++++++++++++++++++++++++++++++++++++++++++++
>  include/hw/acpi/acpi-defs.h | 55 ++++++++++++++++++++++++++
>  2 files changed, 151 insertions(+)
> 
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 78758e2..5a5d594 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -52,6 +52,7 @@
>  #include "hw/pci/pci_bus.h"
>  #include "hw/pci-host/q35.h"
>  #include "hw/i386/intel_iommu.h"
> +#include "hw/i386/amd_iommu.h"
>  #include "hw/timer/hpet.h"
>  
>  #include "hw/acpi/aml-build.h"
> @@ -2424,6 +2425,88 @@ build_dmar_q35(GArray *table_data, GArray *linker)
>  }
>  
>  static void
> +amd_iommu_acpi_set_flag(uint8_t *value, uint64_t flag)
> +{
> +    uint64_t newvalue = *value | flag;
> +    *(uint64_t *)value = newvalue;
> +}
> +
> +static void
> +amd_iommu_acpi_set_feature(uint64_t *value, uint64_t feature)
> +{
> +    uint64_t newvalue = *value | feature;
> +    *value = newvalue;
> +}
> +

These wrappers aren't very useful I think.

> +static void
> +build_amd_iommu(GArray *table_data, GArray *linker)
> +{
> +    int iommu_start = table_data->len;
> +    bool iommu_ambig;
> +    uint64_t host_width = (AMD_IOMMU_HOST_ADDRESS_WIDTH << 8);
> +
> +    AcpiAMDIOMMUIVRS *ivrs;
> +    AcpiAMDIOMMUHardwareUnit *iommu;
> +
> +    /* IVRS definition */
> +    ivrs = acpi_data_push(table_data, sizeof(*ivrs));
> +    ivrs->revision = ACPI_IOMMU_IVRS_TYPE;
> +    ivrs->length = (sizeof(*ivrs) + sizeof(*iommu));
> +    ivrs->v_common_info = host_width;
> +
> +    AMDIOMMUState *s = (AMDIOMMUState *)object_resolve_path_type("",
> +                        TYPE_AMD_IOMMU_DEVICE, &iommu_ambig);
> +
> +    /* IVDB definition */
> +    iommu = acpi_data_push(table_data, sizeof(*iommu));
> +    if (!iommu_ambig) {
> +        iommu->type = 0x10;
> +        /* IVHD flags */
> +        amd_iommu_acpi_set_flag(&iommu->flags, IVHD_HT_TUNEN);
> +        amd_iommu_acpi_set_flag(&iommu->flags, IVHD_PPRSUP);
> +        amd_iommu_acpi_set_flag(&iommu->flags, IVHD_IOTLBSUP);
> +        amd_iommu_acpi_set_flag(&iommu->flags, IVHD_ISOC);
> +        amd_iommu_acpi_set_flag(&iommu->flags, IVHD_PREFSUP);
> +
> +        iommu->length = sizeof(*iommu);
> +        iommu->device_id = PCI_DEVICE_ID_RD890_IOMMU;
> +        iommu->capability_offset = s->capab_offset;
> +        iommu->mmio_base = s->mmio.addr;
> +        fprintf(stderr, "MMIO addr acpi %lx",  s->mmio.addr);
> +
> +        iommu->pci_segment = cpu_to_le16(0);
> +        iommu->interrupt_info = cpu_to_le16(0);
> +
> +        /* EFR features */
> +        amd_iommu_acpi_set_feature(&iommu->efr_register, IVHD_EFR_GTSUP);
> +        amd_iommu_acpi_set_feature(&iommu->efr_register, IVHD_EFR_HATS);
> +        amd_iommu_acpi_set_feature(&iommu->efr_register, IVHD_EFR_GATS);
> +
> +        /* device entries */
> +        memset(iommu->dev_entries, 0, 20);
> +
> +        /* Add device flags here */
> +        iommu->dev_entries[12] = 3;
> +        iommu->dev_entries[16] = 4;
> +        iommu->dev_entries[17] = 0xff;
> +        iommu->dev_entries[18] = 0xff;
> +    }
> +
> +    build_header(linker, table_data, (void *)(table_data->data + iommu_start),
> +                 "IVRS", table_data->len - iommu_start, 1, NULL);
> +}
> +
> +static bool acpi_has_amd_iommu(void)
> +{
> +    bool ambiguous;
> +    Object *amd_iommu;
> +
> +    amd_iommu = object_resolve_path_type("", TYPE_AMD_IOMMU_DEVICE,
> +                                         &ambiguous);
> +    return amd_iommu && !ambiguous;
> +}
> +
> +static void
>  build_dsdt(GArray *table_data, GArray *linker,
>             AcpiPmInfo *pm, AcpiMiscInfo *misc)
>  {
> @@ -2481,6 +2564,14 @@ build_dsdt(GArray *table_data, GArray *linker,
>          build_q35_pci0_int(dsdt);
>      }
>  
> +    /* AMD IOMMU */
> +    if (acpi_has_amd_iommu()) {
> +        sb_scope = aml_scope("_SB");
> +        aml_append(sb_scope,
> +            aml_operation_region("AMDV", AML_SYSTEM_MEMORY, IOMMU_BASE_ADDR,
> +                                 16*1024));
> +    }
> +

Where does AMDV string come from?

>      build_cpu_hotplug_aml(dsdt);
>      build_memory_hotplug_aml(dsdt, nr_mem, pm->mem_hp_io_base,
>                               pm->mem_hp_io_len);
> @@ -2691,6 +2782,11 @@ void acpi_build(PcGuestInfo *guest_info, AcpiBuildTables *tables)
>          build_dmar_q35(tables_blob, tables->linker);
>      }
>  
> +    if (acpi_has_amd_iommu() && !acpi_has_iommu()) {
> +        acpi_add_table(table_offsets, tables_blob);
> +        build_amd_iommu(tables_blob, tables->linker);
> +    }
> +
>      if (acpi_has_nvdimm()) {
>          nvdimm_build_acpi(table_offsets, tables_blob, tables->linker);
>      }
> diff --git a/include/hw/acpi/acpi-defs.h b/include/hw/acpi/acpi-defs.h
> index c7a03d4..a161358 100644
> --- a/include/hw/acpi/acpi-defs.h
> +++ b/include/hw/acpi/acpi-defs.h
> @@ -570,4 +570,59 @@ typedef struct AcpiDmarHardwareUnit AcpiDmarHardwareUnit;
>  /* Masks for Flags field above */
>  #define ACPI_DMAR_INCLUDE_PCI_ALL   1
>  
> +/* IVRS constants */
> +#define ACPI_IOMMU_HARDWAREUNIT_TYPE 0x10
> +#define ACPI_IOMMU_IVRS_TYPE 0x1
> +#define AMD_IOMMU_HOST_ADDRESS_WIDTH 39UL
> +
> +/* AMD IOMMU IVRS table */
> +struct AcpiAMDIOMMUIVRS {
> +    ACPI_TABLE_HEADER_DEF
> +    uint32_t v_common_info; /* common virtualization information */
> +    uint64_t reserved;      /* reserved                          */
> +} QEMU_PACKED;
> +typedef struct AcpiAMDIOMMUIVRS AcpiAMDIOMMUIVRS;
> +
> +/* flags in the IVHD headers */
> +#define IVHD_HT_TUNEN    (1UL << 0)
> +#define IVHD_PASS_PW     (1UL << 1)
> +#define IVHD_RESPASS_PW  (1UL << 2)
> +#define IVHD_ISOC        (1UL << 3)
> +#define IVHD_IOTLBSUP    (1UL << 4)
> +#define IVHD_COHERENT    (1UL << 5)
> +#define IVHD_PREFSUP     (1UL << 6)
> +#define IVHD_PPRSUP      (1UL << 7)
> +
> +/* features in the IVHD headers */
> +#define IVHD_EFR_HATS       48
> +#define IVHD_EFR_GATS       48
> +#define IVHD_EFR_MSI_NUM
> +#define IVHD_EFR_PNBANKS
> +#define IVHD_EFR_PNCOUNTERS
> +#define IVHD_EFR_PASMAX
> +#define IVHD_EFR_HESUP  (1UL << 7)
> +#define IVHD_EFR_GASUP  (1UL << 6)
> +#define IVHD_EFR_IASUP  (1UL << 5)
> +#define IVHD_EFR_GLXSUP (3UL << 3)
> +#define IVHD_EFR_GTSUP  (1UL << 2)
> +#define IVHD_EFR_NXSUP  (1UL << 1)
> +#define IVHD_EFR_XTSUP  (1UL << 0)
> +
> +/* IVDB type 10h */
> +struct AcpiAMDIOMMUHardwareUnit {
> +    uint8_t type;
> +    uint8_t flags;
> +    uint16_t length;
> +    uint16_t device_id;
> +    uint16_t capability_offset;
> +    uint64_t mmio_base;
> +    uint16_t pci_segment;
> +    uint16_t interrupt_info;
> +    uint32_t features;
> +    uint64_t efr_register;
> +    uint64_t reserved;
> +    uint8_t dev_entries[20];
> +} QEMU_PACKED;
> +typedef struct AcpiAMDIOMMUHardwareUnit AcpiAMDIOMMUHardwareUnit;
> +
>  #endif
> -- 
> 2.1.4