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pci: acpi: add _DSM method to PCI devices 

Implement _DSM according to:
    PCI Firmware Specification 3.1
    4.6.7.  DSM for Naming a PCI or PCI Express Device Under
            Operating Systems
and wire it up to cold and hot-plugged PCI devices.
Feature depends on ACPI hotplug being enabled (as that provides
PCI devices descriptions in ACPI and MMIO registers that are
reused to fetch acpi-index).

acpi-index should work for
  - cold plugged NICs:
      $QEMU -device e1000,acpi-index=100
         => 'eno100'
  - hot-plugged
      (monitor) device_add e1000,acpi-index=200,id=remove_me
         => 'eno200'
  - re-plugged
      (monitor) device_del remove_me
      (monitor) device_add e1000,acpi-index=1
         => 'eno1'

Windows also sees index under "PCI Label Id" field in properties
dialog but otherwise it doesn't seem to have any effect.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20210315180102.3008391-6-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Igor Mammedov 2021-03-15 14:01:01 -04:00 committed by Michael S. Tsirkin
parent 910e406971
commit b7f23f62e4
2 changed files with 103 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

105
hw/i386/acpi-build.c
View File

@ -397,6 +397,13 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
aml_call2("PCEJ", aml_name("BSEL"), aml_name("_SUN"))
);
aml_append(dev, method);
method = aml_method("_DSM", 4, AML_SERIALIZED);
aml_append(method,
aml_return(aml_call6("PDSM", aml_arg(0), aml_arg(1),
aml_arg(2), aml_arg(3),
aml_name("BSEL"), aml_name("_SUN")))
);
aml_append(dev, method);
aml_append(parent_scope, dev);
build_append_pcihp_notify_entry(notify_method, slot);
@ -424,6 +431,16 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
dev = aml_device("S%.02X", PCI_DEVFN(slot, 0));
aml_append(dev, aml_name_decl("_ADR", aml_int(slot << 16)));
if (bsel) {
aml_append(dev, aml_name_decl("_SUN", aml_int(slot)));
method = aml_method("_DSM", 4, AML_SERIALIZED);
aml_append(method, aml_return(
aml_call6("PDSM", aml_arg(0), aml_arg(1), aml_arg(2),
aml_arg(3), aml_name("BSEL"), aml_name("_SUN"))
));
aml_append(dev, method);
}
if (pc->class_id == PCI_CLASS_DISPLAY_VGA) {
/* add VGA specific AML methods */
int s3d;
@ -446,9 +463,7 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
aml_append(method, aml_return(aml_int(s3d)));
aml_append(dev, method);
} else if (hotplug_enabled_dev) {
/* add _SUN/_EJ0 to make slot hotpluggable */
aml_append(dev, aml_name_decl("_SUN", aml_int(slot)));
/* add _EJ0 to make slot hotpluggable */
method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
aml_append(method,
aml_call2("PCEJ", aml_name("BSEL"), aml_name("_SUN"))
@ -511,6 +526,88 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
qobject_unref(bsel);
}
Aml *aml_pci_device_dsm(void)
{
Aml *method, *UUID, *ifctx, *ifctx1, *ifctx2, *ifctx3, *elsectx;
Aml *acpi_index = aml_local(0);
Aml *zero = aml_int(0);
Aml *bnum = aml_arg(4);
Aml *func = aml_arg(2);
Aml *rev = aml_arg(1);
Aml *sun = aml_arg(5);
method = aml_method("PDSM", 6, AML_SERIALIZED);
/*
* PCI Firmware Specification 3.1
* 4.6. _DSM Definitions for PCI
*/
UUID = aml_touuid("E5C937D0-3553-4D7A-9117-EA4D19C3434D");
ifctx = aml_if(aml_equal(aml_arg(0), UUID));
{
aml_append(ifctx, aml_store(aml_call2("AIDX", bnum, sun), acpi_index));
ifctx1 = aml_if(aml_equal(func, zero));
{
uint8_t byte_list[1];
ifctx2 = aml_if(aml_equal(rev, aml_int(2)));
{
/*
* advertise function 7 if device has acpi-index
* acpi_index values:
* 0: not present (default value)
* FFFFFFFF: not supported (old QEMU without PIDX reg)
* other: device's acpi-index
*/
ifctx3 = aml_if(aml_lnot(
aml_or(aml_equal(acpi_index, zero),
aml_equal(acpi_index, aml_int(0xFFFFFFFF)), NULL)
));
{
byte_list[0] =
1 /* have supported functions */ |
1 << 7 /* support for function 7 */
;
aml_append(ifctx3, aml_return(aml_buffer(1, byte_list)));
}
aml_append(ifctx2, ifctx3);
}
aml_append(ifctx1, ifctx2);
byte_list[0] = 0; /* nothing supported */
aml_append(ifctx1, aml_return(aml_buffer(1, byte_list)));
}
aml_append(ifctx, ifctx1);
elsectx = aml_else();
/*
* PCI Firmware Specification 3.1
* 4.6.7. _DSM for Naming a PCI or PCI Express Device Under
* Operating Systems
*/
ifctx1 = aml_if(aml_equal(func, aml_int(7)));
{
Aml *pkg = aml_package(2);
Aml *ret = aml_local(1);
aml_append(pkg, zero);
/*
* optional, if not impl. should return null string
*/
aml_append(pkg, aml_string("%s", ""));
aml_append(ifctx1, aml_store(pkg, ret));
/*
* update acpi-index to actual value
*/
aml_append(ifctx1, aml_store(acpi_index, aml_index(ret, zero)));
aml_append(ifctx1, aml_return(ret));
}
aml_append(elsectx, ifctx1);
aml_append(ifctx, elsectx);
}
aml_append(method, ifctx);
return method;
}
/**
* build_prt_entry:
* @link_name: link name for PCI route entry
@ -1195,6 +1292,8 @@ static void build_piix4_pci_hotplug(Aml *table)
aml_append(method, aml_return(aml_local(0)));
aml_append(scope, method);
aml_append(scope, aml_pci_device_dsm());
aml_append(table, scope);
}

1
include/hw/acpi/pci.h
View File

@ -35,4 +35,5 @@ typedef struct AcpiMcfgInfo {
void build_mcfg(GArray *table_data, BIOSLinker *linker, AcpiMcfgInfo *info,
const char *oem_id, const char *oem_table_id);
Aml *aml_pci_device_dsm(void);
#endif