piix4: don't reserve hw resources when hotplug is off globally
When acpi hotplug is turned off for both root pci bus as well as for pci
bridges, we should not generate the related ACPI code for DSDT table or
initialize related hw ports or reserve hw resources. This change makes
sure all those operations are turned off in the case ACPI pci hotplug is
off globally.
In this change, we also make sure ACPI code for the PCNT method are only
added when bsel is enabled for the corresponding pci bus or bridge hotplug
is turned on.
As q35 machines do not use bsel for it's pci buses at this point in time, this
change affects DSDT acpi table for q35 machines as well. Therefore, we will
also need to commit the updated golden master DSDT table acpi binary blobs as
well. Following is the list of blobs which needs updating:
tests/data/acpi/q35/DSDT
tests/data/acpi/q35/DSDT.acpihmat
tests/data/acpi/q35/DSDT.bridge
tests/data/acpi/q35/DSDT.cphp
tests/data/acpi/q35/DSDT.dimmpxm
tests/data/acpi/q35/DSDT.ipmibt
tests/data/acpi/q35/DSDT.memhp
tests/data/acpi/q35/DSDT.mmio64
tests/data/acpi/q35/DSDT.numamem
tests/data/acpi/q35/DSDT.tis
These tables are updated in the following commit. Without the updated table
blobs, the unit tests would fail with this patch.
Signed-off-by: Ani Sinha <ani@anisinha.ca>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20200918084111.15339-11-ani@anisinha.ca>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 2b17843..8d14e46 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -96,6 +96,7 @@
bool s4_disabled;
bool pcihp_bridge_en;
bool smi_on_cpuhp;
+ bool pcihp_root_en;
uint8_t s4_val;
AcpiFadtData fadt;
uint16_t cpu_hp_io_base;
@@ -251,6 +252,9 @@
pm->pcihp_bridge_en =
object_property_get_bool(obj, "acpi-pci-hotplug-with-bridge-support",
NULL);
+ pm->pcihp_root_en =
+ object_property_get_bool(obj, "acpi-root-pci-hotplug",
+ NULL);
}
static void acpi_get_misc_info(AcpiMiscInfo *info)
@@ -456,10 +460,12 @@
}
/* Append PCNT method to notify about events on local and child buses.
- * Add unconditionally for root since DSDT expects it.
+ * Add this method for root bus only when hotplug is enabled since DSDT
+ * expects it.
*/
- method = aml_method("PCNT", 0, AML_NOTSERIALIZED);
-
+ if (bsel || pcihp_bridge_en) {
+ method = aml_method("PCNT", 0, AML_NOTSERIALIZED);
+ }
/* If bus supports hotplug select it and notify about local events */
if (bsel) {
uint64_t bsel_val = qnum_get_uint(qobject_to(QNum, bsel));
@@ -485,7 +491,10 @@
aml_append(method, aml_name("^S%.02X.PCNT", devfn));
}
}
- aml_append(parent_scope, method);
+
+ if (bsel || pcihp_bridge_en) {
+ aml_append(parent_scope, method);
+ }
qobject_unref(bsel);
}
@@ -1510,7 +1519,9 @@
build_hpet_aml(dsdt);
build_piix4_isa_bridge(dsdt);
build_isa_devices_aml(dsdt);
- build_piix4_pci_hotplug(dsdt);
+ if (pm->pcihp_bridge_en || pm->pcihp_root_en) {
+ build_piix4_pci_hotplug(dsdt);
+ }
build_piix4_pci0_int(dsdt);
} else {
sb_scope = aml_scope("_SB");
@@ -1579,7 +1590,7 @@
{
aml_append(scope, aml_name_decl("_HID", aml_string("ACPI0006")));
- if (misc->is_piix4) {
+ if (misc->is_piix4 && (pm->pcihp_bridge_en || pm->pcihp_root_en)) {
method = aml_method("_E01", 0, AML_NOTSERIALIZED);
aml_append(method,
aml_acquire(aml_name("\\_SB.PCI0.BLCK"), 0xFFFF));
@@ -1731,7 +1742,7 @@
crs_range_set_free(&crs_range_set);
/* reserve PCIHP resources */
- if (pm->pcihp_io_len) {
+ if (pm->pcihp_io_len && (pm->pcihp_bridge_en || pm->pcihp_root_en)) {
dev = aml_device("PHPR");
aml_append(dev, aml_name_decl("_HID", aml_string("PNP0A06")));
aml_append(dev,
