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acpi: add ATSR for q35

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This patch provides ATSR which was a requirement for software that
wants to enable ATS on endpoint devices behind a Root Port. This is
done simply by setting ALL_PORTS which indicates all PCI-Express Root
Ports support ATS transactions.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2016-12-30 18:09:16 +08:00 committed by Michael S. Tsirkin
parent 615c4ed205
commit bd2baaccd5
2 changed files with 21 additions and 0 deletions
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9
hw/i386/acpi-build.c
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@ -2575,6 +2575,7 @@ build_dmar_q35(GArray *table_data, BIOSLinker *linker)
AcpiTableDmar *dmar;
AcpiDmarHardwareUnit *drhd;
AcpiDmarRootPortATS *atsr;
uint8_t dmar_flags = 0;
X86IOMMUState *iommu = x86_iommu_get_default();
AcpiDmarDeviceScope *scope = NULL;
@ -2608,6 +2609,14 @@ build_dmar_q35(GArray *table_data, BIOSLinker *linker)
scope->path[0].device = PCI_SLOT(Q35_PSEUDO_DEVFN_IOAPIC);
scope->path[0].function = PCI_FUNC(Q35_PSEUDO_DEVFN_IOAPIC);
if (iommu->dt_supported) {
atsr = acpi_data_push(table_data, sizeof(*atsr));
atsr->type = cpu_to_le16(ACPI_DMAR_TYPE_ATSR);
atsr->length = cpu_to_le16(sizeof(*atsr));
atsr->flags = ACPI_DMAR_ATSR_ALL_PORTS;
atsr->pci_segment = cpu_to_le16(0);
}
build_header(linker, table_data, (void *)(table_data->data + dmar_start),
"DMAR", table_data->len - dmar_start, 1, NULL, NULL);
}

12
include/hw/acpi/acpi-defs.h
View File

@ -627,8 +627,20 @@ struct AcpiDmarHardwareUnit {
} QEMU_PACKED;
typedef struct AcpiDmarHardwareUnit AcpiDmarHardwareUnit;
/* Type 2: Root Port ATS Capability Reporting Structure */
struct AcpiDmarRootPortATS {
uint16_t type;
uint16_t length;
uint8_t flags;
uint8_t reserved;
uint16_t pci_segment;
AcpiDmarDeviceScope scope[0];
} QEMU_PACKED;
typedef struct AcpiDmarRootPortATS AcpiDmarRootPortATS;
/* Masks for Flags field above */
#define ACPI_DMAR_INCLUDE_PCI_ALL 1
#define ACPI_DMAR_ATSR_ALL_PORTS 1
/*
* Input Output Remapping Table (IORT)