On Fri, 23 Feb 2024 12:42:23 +0000
<[email protected]> wrote:
> From: Ankit Agrawal <[email protected]>
>
> ACPI spec provides a scheme to associate "Generic Initiators" [1]
> (e.g. heterogeneous processors and accelerators, GPUs, and I/O devices with
> integrated compute or DMA engines GPUs) with Proximity Domains. This is
> achieved using Generic Initiator Affinity Structure in SRAT. During bootup,
> Linux kernel parse the ACPI SRAT to determine the PXM ids and create a NUMA
> node for each unique PXM ID encountered. Qemu currently do not implement
> these structures while building SRAT.
>
> Add GI structures while building VM ACPI SRAT. The association between
> device and node are stored using acpi-generic-initiator object. Lookup
> presence of all such objects and use them to build these structures.
>
> The structure needs a PCI device handle [2] that consists of the device BDF.
> The vfio-pci device corresponding to the acpi-generic-initiator object is
> located to determine the BDF.
>
> [1] ACPI Spec 6.3, Section 5.2.16.6
> [2] ACPI Spec 6.3, Table 5.80
>
> Signed-off-by: Ankit Agrawal <[email protected]>
Hi Ankit,
As the code stands the use of a list seems overkill.
Otherwise looks good to me. I need Generic Ports support for CXL
stuff so will copy your approach for that as it's ended up nice
and simple.
Jonathan
> ---
> hw/acpi/acpi-generic-initiator.c | 84 ++++++++++++++++++++++++
> hw/arm/virt-acpi-build.c | 3 +
> include/hw/acpi/acpi-generic-initiator.h | 26 ++++++++
> 3 files changed, 113 insertions(+)
>
> diff --git a/hw/acpi/acpi-generic-initiator.c
> b/hw/acpi/acpi-generic-initiator.c
> index 1ade2f723f..d78382bc63 100644
> --- a/hw/acpi/acpi-generic-initiator.c
> +++ b/hw/acpi/acpi-generic-initiator.c
> @@ -68,3 +68,87 @@ static void acpi_generic_initiator_class_init(ObjectClass
> *oc, void *data)
> object_class_property_add(oc, "node", "int", NULL,
> acpi_generic_initiator_set_node, NULL, NULL);
> }
> +
> +static int acpi_generic_initiator_list(Object *obj, void *opaque)
> +{
> + GSList **list = opaque;
> +
> + if (object_dynamic_cast(obj, TYPE_ACPI_GENERIC_INITIATOR)) {
> + *list = g_slist_append(*list, ACPI_GENERIC_INITIATOR(obj));
> + }
> +
> + object_child_foreach(obj, acpi_generic_initiator_list, opaque);
See below. There is a recursive helper that avoids need for this.
> + return 0;
> +}
> +
> +/*
> + * Identify Generic Initiator objects and link them into the list which is
> + * returned to the caller.
> + *
> + * Note: it is the caller's responsibility to free the list to avoid
> + * memory leak.
> + */
> +static GSList *acpi_generic_initiator_get_list(void)
> +{
> + GSList *list = NULL;
> +
> + object_child_foreach(object_get_root(),
> + acpi_generic_initiator_list, &list);
I think you can use object_child_foreach_recursive() and skip the manual
calling above?
> + return list;
> +}
> +
> +/*
> + * ACPI 6.3:
> + * Table 5-78 Generic Initiator Affinity Structure
> + */
> +static void
> +build_srat_generic_pci_initiator_affinity(GArray *table_data, int node,
> + PCIDeviceHandle *handle)
> +{
> + uint8_t index;
> +
> + build_append_int_noprefix(table_data, 5, 1); /* Type */
> + build_append_int_noprefix(table_data, 32, 1); /* Length */
> + build_append_int_noprefix(table_data, 0, 1); /* Reserved */
> + build_append_int_noprefix(table_data, 1, 1); /* Device Handle Type: PCI
> */
> + build_append_int_noprefix(table_data, node, 4); /* Proximity Domain */
> +
> + /* Device Handle - PCI */
> + build_append_int_noprefix(table_data, handle->segment, 2);
> + build_append_int_noprefix(table_data, handle->bdf, 2);
> + for (index = 0; index < 12; index++) {
> + build_append_int_noprefix(table_data, 0, 1);
> + }
> +
> + build_append_int_noprefix(table_data, GEN_AFFINITY_ENABLED, 4); /* Flags
> */
> + build_append_int_noprefix(table_data, 0, 4); /* Reserved */
> +}
> +
> +void build_srat_generic_pci_initiator(GArray *table_data)
> +{
> + GSList *gi_list, *list = acpi_generic_initiator_get_list();
Did you consider just have the functional called in the scan do this?
Not sure you need anything as a parameter beyond the GArray *table_data
Something like...
static int acpi_generic_initiator_list(Object *obj, void *opaque)
{
uint8_t index;
AcpiGenericInitiator *gi;
GArray *table_data = opaque;
PCIDeviceHandle dev_handle;
PCIDevice *pci_dev;
Object *o;
if (!object_dynamic_cast(obj, TYPE_ACPI_GENERIC_INITIATOR)) {
return 0;
}
gi = ACPI_GENERIC_INITIATOR(obj);
o = object_resolve_path_type(gi->pci_dev, TYPE_PCI_DEVICE, NULL);
if (!o) {
error_setg(&error_abort, "GI: Specified device must be a PCI device.\n")
return 1;
}
pci_dev = PCI_DEVICE(o);
dev_handle.segment = 0;
dev_handle.bdf = PCI_BUILD_BDF(pci_bus_num(pci_get_bus(pci_dev)),
pci_dev->devfn);
build_srat_generic_pci_initiator_affinity(table_data,
gi->node, &dev_handle);
}
+ a call to.
object_child_foreach_recursive(object_get_root(),
acpi_generic_srat, table_data);
> + AcpiGenericInitiator *gi;
> +
> + for (gi_list = list; gi_list; gi_list = gi_list->next) {
> + PCIDeviceHandle dev_handle;
> + PCIDevice *pci_dev;
> + Object *o;
> +
> + gi = gi_list->data;
> +
> + o = object_resolve_path_type(gi->pci_dev, TYPE_PCI_DEVICE, NULL);
> + if (!o) {
> + error_printf("Specified device must be a PCI device.\n");
as above, use an errp rather than exit(1);
> + exit(1);
> + }
> + pci_dev = PCI_DEVICE(o);
> +
> + dev_handle.segment = 0;
> + dev_handle.bdf = PCI_BUILD_BDF(pci_bus_num(pci_get_bus(pci_dev)),
> + pci_dev->devfn);
> + build_srat_generic_pci_initiator_affinity(table_data,
> + gi->node, &dev_handle);
Should we check for consistency of gi->node and
-numa node,id=X entries?
Maybe just check less than numa_state->num_nodes as that's the variable
used to walk the other structures when building srat.
> + }
> +
> + g_slist_free(list);
> +}
> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index 8bc35a483c..00d77327e0 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -58,6 +58,7 @@
> #include "migration/vmstate.h"
> #include "hw/acpi/ghes.h"
> #include "hw/acpi/viot.h"
> +#include "hw/acpi/acpi-generic-initiator.h"
>
> #define ARM_SPI_BASE 32
>
> @@ -558,6 +559,8 @@ build_srat(GArray *table_data, BIOSLinker *linker,
> VirtMachineState *vms)
> }
> }
>
> + build_srat_generic_pci_initiator(table_data);
Perhaps passing in a suitable Error ** would be sensible.
> +
> if (ms->nvdimms_state->is_enabled) {
> nvdimm_build_srat(table_data);
> }
> diff --git a/include/hw/acpi/acpi-generic-initiator.h
> b/include/hw/acpi/acpi-generic-initiator.h
> index 2f183b029a..213545e614 100644
> --- a/include/hw/acpi/acpi-generic-initiator.h
> +++ b/include/hw/acpi/acpi-generic-initiator.h
> @@ -29,4 +29,30 @@ typedef struct AcpiGenericInitiatorClass {
> ObjectClass parent_class;
> } AcpiGenericInitiatorClass;
>
> +/*
> + * ACPI 6.3:
> + * Table 5-81 Flags – Generic Initiator Affinity Structure
> + */
> +typedef enum {
> + GEN_AFFINITY_ENABLED = (1 << 0), /*
> + * If clear, the OSPM ignores the
> contents
> + * of the Generic Initiator/Port
> Affinity
> + * Structure. This allows system
> firmware
> + * to populate the SRAT with a static
> + * number of structures, but only enable
> + * them as necessary.
> + */
I'd put the comment above the definition to avoid wrapping so much!
> +} GenericAffinityFlags;
> +
> +/*
> + * ACPI 6.3:
> + * Table 5-80 Device Handle - PCI
> + */
> +typedef struct PCIDeviceHandle {
> + uint16_t segment;
> + uint16_t bdf;
> +} PCIDeviceHandle;
> +
> +void build_srat_generic_pci_initiator(GArray *table_data);
> +
> #endif
