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[PULL 18/23] hw/pci: Add pci_bus_range() to get PCI bus number range
From: |
Michael S. Tsirkin |
Subject: |
[PULL 18/23] hw/pci: Add pci_bus_range() to get PCI bus number range |
Date: |
Tue, 13 Jul 2021 18:11:03 -0400 |
From: Xingang Wang <wangxingang5@huawei.com>
This helps to get the min and max bus number of a PCI bus hierarchy.
Signed-off-by: Xingang Wang <wangxingang5@huawei.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-Id: <1625748919-52456-6-git-send-email-wangxingang5@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
include/hw/pci/pci.h | 1 +
hw/pci/pci.c | 16 ++++++++++++++++
2 files changed, 17 insertions(+)
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index f4d51b672b..d0f4266e37 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -450,6 +450,7 @@ static inline PCIBus *pci_get_bus(const PCIDevice *dev)
return PCI_BUS(qdev_get_parent_bus(DEVICE(dev)));
}
int pci_bus_num(PCIBus *s);
+void pci_bus_range(PCIBus *bus, int *min_bus, int *max_bus);
static inline int pci_dev_bus_num(const PCIDevice *dev)
{
return pci_bus_num(pci_get_bus(dev));
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 27d588e268..23d2ae2ab2 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -537,6 +537,22 @@ int pci_bus_num(PCIBus *s)
return PCI_BUS_GET_CLASS(s)->bus_num(s);
}
+/* Returns the min and max bus numbers of a PCI bus hierarchy */
+void pci_bus_range(PCIBus *bus, int *min_bus, int *max_bus)
+{
+ int i;
+ *min_bus = *max_bus = pci_bus_num(bus);
+
+ for (i = 0; i < ARRAY_SIZE(bus->devices); ++i) {
+ PCIDevice *dev = bus->devices[i];
+
+ if (dev && PCI_DEVICE_GET_CLASS(dev)->is_bridge) {
+ *min_bus = MIN(*min_bus, dev->config[PCI_SECONDARY_BUS]);
+ *max_bus = MAX(*max_bus, dev->config[PCI_SUBORDINATE_BUS]);
+ }
+ }
+}
+
int pci_bus_numa_node(PCIBus *bus)
{
return PCI_BUS_GET_CLASS(bus)->numa_node(bus);
--
MST
- [PULL 05/23] hw/acpi/ich9: Set ACPI PCI hot-plug as default on Q35, (continued)
- [PULL 05/23] hw/acpi/ich9: Set ACPI PCI hot-plug as default on Q35, Michael S. Tsirkin, 2021/07/13
- [PULL 07/23] vhost-user-rng: Add vhost-user-rng implementation, Michael S. Tsirkin, 2021/07/13
- [PULL 08/23] vhost-user-rng-pci: Add vhost-user-rng-pci implementation, Michael S. Tsirkin, 2021/07/13
- [PULL 09/23] vhost-user-rng: backend: Add RNG vhost-user daemon implementation, Michael S. Tsirkin, 2021/07/13
- [PULL 11/23] hw/virtio: add boilerplate for vhost-user-i2c device, Michael S. Tsirkin, 2021/07/13
- [PULL 12/23] hw/virtio: add vhost-user-i2c-pci boilerplate, Michael S. Tsirkin, 2021/07/13
- [PULL 13/23] docs: Add '-device intel-iommu' entry, Michael S. Tsirkin, 2021/07/13
- [PULL 14/23] hw/pci/pci_host: Allow PCI host to bypass iommu, Michael S. Tsirkin, 2021/07/13
- [PULL 15/23] hw/pxb: Add a bypass iommu property, Michael S. Tsirkin, 2021/07/13
- [PULL 17/23] hw/i386: Add a default_bus_bypass_iommu pc machine option, Michael S. Tsirkin, 2021/07/13
- [PULL 18/23] hw/pci: Add pci_bus_range() to get PCI bus number range,
Michael S. Tsirkin <=
- [PULL 19/23] hw/arm/virt-acpi-build: Add IORT support to bypass SMMUv3, Michael S. Tsirkin, 2021/07/13
- [PULL 20/23] hw/i386/acpi-build: Add DMAR support to bypass iommu, Michael S. Tsirkin, 2021/07/13
- [PULL 21/23] hw/i386/acpi-build: Add IVRS support to bypass iommu, Michael S. Tsirkin, 2021/07/13
- [PULL 22/23] docs: Add documentation for iommu bypass, Michael S. Tsirkin, 2021/07/13
- [PULL 23/23] vhost-vsock: SOCK_SEQPACKET feature bit support, Michael S. Tsirkin, 2021/07/13
- [PULL 06/23] bios-tables-test: Update golden binaries, Michael S. Tsirkin, 2021/07/13
- [PULL 04/23] bios-tables-test: Allow changes in DSDT ACPI tables, Michael S. Tsirkin, 2021/07/13
- [PULL 16/23] hw/arm/virt: Add default_bus_bypass_iommu machine option, Michael S. Tsirkin, 2021/07/13
- [PULL 10/23] docs: Add documentation for vhost based RNG implementation, Michael S. Tsirkin, 2021/07/13
- Re: [PULL 00/23] pc,pci,virtio: lots of new features, Peter Maydell, 2021/07/14