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x86: pci: acpi: consolidate PCI slots creation

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No functional changes nor AML bytecode changes.
Consolidate code that generates empty and populated slot
descriptors. Besides eliminating duplication,
it helps consolidate conditions for generating
parts of Device{} desriptor in one place, which makes
code more compact and easier to read.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20220701133515.137890-18-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 2022-07-01 09:35:15 -04:00 committed by Michael S. Tsirkin
parent 1ccd222094
commit 3216ab2acb
1 changed files with 54 additions and 57 deletions
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111
hw/i386/acpi-build.c
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@ -427,13 +427,41 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
int func = PCI_FUNC(devfn);
/* ACPI spec: 1.0b: Table 6-2 _ADR Object Bus Types, PCI type */
int adr = slot << 16 | func;
bool hotplug_enabled_dev;
bool bridge_in_acpi;
bool cold_plugged_bridge;
bool hotpluggbale_slot = false;
bool bridge_in_acpi = false;
bool cold_plugged_bridge = false;
bool is_vga = false;
if (pdev) {
pc = PCI_DEVICE_GET_CLASS(pdev);
dc = DEVICE_GET_CLASS(pdev);
if (pc->class_id == PCI_CLASS_BRIDGE_ISA) {
continue;
}
is_vga = pc->class_id == PCI_CLASS_DISPLAY_VGA;
if (!pdev) {
/*
* add hotplug slots for non present devices.
* Cold plugged bridges aren't themselves hot-pluggable.
* Hotplugged bridges *are* hot-pluggable.
*/
cold_plugged_bridge = pc->is_bridge && !DEVICE(pdev)->hotplugged;
bridge_in_acpi = cold_plugged_bridge && pcihp_bridge_en;
hotpluggbale_slot = bsel && dc->hotpluggable &&
!cold_plugged_bridge;
/*
* allow describing coldplugged bridges in ACPI even if they are not
* on function 0, as they are not unpluggable, for all other devices
* generate description only for function 0 per slot
*/
if (func && !bridge_in_acpi) {
continue;
}
} else {
/*
* hotplug is supported only for non-multifunction device
* so generate device description only for function 0
*/
@ -441,46 +469,11 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
if (pci_bus_is_express(bus) && slot > 0) {
break;
}
dev = aml_device("S%.02X", devfn);
aml_append(dev, aml_name_decl("_ADR", aml_int(adr)));
aml_append(dev, aml_name_decl("ASUN", aml_int(slot)));
aml_append(dev, aml_pci_device_dsm());
aml_append(dev, aml_name_decl("_SUN", aml_int(slot)));
method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
aml_append(method,
aml_call2("PCEJ", aml_name("BSEL"), aml_name("_SUN"))
);
aml_append(dev, method);
aml_append(parent_scope, dev);
build_append_pcihp_notify_entry(notify_method, slot);
/* mark it as empty hotpluggable slot */
hotpluggbale_slot = true;
} else {
continue;
}
continue;
}
pc = PCI_DEVICE_GET_CLASS(pdev);
dc = DEVICE_GET_CLASS(pdev);
/*
* Cold plugged bridges aren't themselves hot-pluggable.
* Hotplugged bridges *are* hot-pluggable.
*/
cold_plugged_bridge = pc->is_bridge && !DEVICE(pdev)->hotplugged;
bridge_in_acpi = cold_plugged_bridge && pcihp_bridge_en;
hotplug_enabled_dev = bsel && dc->hotpluggable && !cold_plugged_bridge;
if (pc->class_id == PCI_CLASS_BRIDGE_ISA) {
continue;
}
/*
* allow describing coldplugged bridges in ACPI even if they are not
* on function 0, as they are not unpluggable, for all other devices
* generate description only for function 0 per slot
*/
if (func && !bridge_in_acpi) {
continue;
}
/* start to compose PCI device descriptor */
@ -496,7 +489,7 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
aml_append(dev, aml_pci_device_dsm());
}
if (pc->class_id == PCI_CLASS_DISPLAY_VGA) {
if (is_vga) {
/* add VGA specific AML methods */
int s3d;
@ -517,19 +510,10 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
method = aml_method("_S3D", 0, AML_NOTSERIALIZED);
aml_append(method, aml_return(aml_int(s3d)));
aml_append(dev, method);
} else if (hotplug_enabled_dev) {
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"))
);
aml_append(dev, method);
}
if (bsel) {
build_append_pcihp_notify_entry(notify_method, slot);
}
} else if (bridge_in_acpi) {
bridge_in_acpi = cold_plugged_bridge && pcihp_bridge_en;
if (bridge_in_acpi) {
/*
* device is coldplugged bridge,
* add child device descriptions into its scope
@ -538,6 +522,19 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
build_append_pci_bus_devices(dev, sec_bus, pcihp_bridge_en);
}
if (hotpluggbale_slot) {
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"))
);
aml_append(dev, method);
build_append_pcihp_notify_entry(notify_method, slot);
}
/* device descriptor has been composed, add it into parent context */
aml_append(parent_scope, dev);
}