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| author |   Yicong Yang <yangyicong@hisilicon.com> | 2020-05-09 18:19:28 +0800 |
|---|---|---|
| committer |   Bjorn Helgaas <bhelgaas@google.com> | 2020-05-14 16:35:09 -0500 |
| commit | 6ae72bfa656ea04806f98ef85cb44b0789064362 (patch) | |
| tree | 3e476c1b2f8c95051f631686d1158042c4a4d4f8 /include/linux/pci.h | |
| parent | PCI: Replace zero-length array with flexible-array (diff) | |
| download | wireguard-linux-6ae72bfa656ea04806f98ef85cb44b0789064362.tar.xz wireguard-linux-6ae72bfa656ea04806f98ef85cb44b0789064362.zip | |
PCI: Unify pcie_find_root_port() and pci_find_pcie_root_port()
Previously we used pcie_find_root_port() to find a Root Port from a PCIe
device and pci_find_pcie_root_port() to find a Root Port from a
Conventional PCI device.
Unify the two functions and use pcie_find_root_port() to find a Root Port
from either a Conventional PCI device or a PCIe device. Then there is no
need to distinguish the type of the device.
Link: https://lore.kernel.org/r/1589019568-5216-1-git-send-email-yangyicong@hisilicon.com
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Kalle Valo <kvalo@codeaurora.org> # wireless
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> # thunderbolt
Diffstat (limited to 'include/linux/pci.h')
| -rw-r--r-- | include/linux/pci.h | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index 0453ee458ab1..bbd6510065a7 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1025,7 +1025,6 @@ void pci_bus_add_device(struct pci_dev *dev); void pci_read_bridge_bases(struct pci_bus *child); struct resource *pci_find_parent_resource(const struct pci_dev *dev, struct resource *res); -struct pci_dev *pci_find_pcie_root_port(struct pci_dev *dev); u8 pci_swizzle_interrupt_pin(const struct pci_dev *dev, u8 pin); int pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge); u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp); @@ -2143,17 +2142,23 @@ static inline int pci_pcie_type(const struct pci_dev *dev) return (pcie_caps_reg(dev) & PCI_EXP_FLAGS_TYPE) >> 4; } +/** + * pcie_find_root_port - Get the PCIe root port device + * @dev: PCI device + * + * Traverse up the parent chain and return the PCIe Root Port PCI Device + * for a given PCI/PCIe Device. + */ static inline struct pci_dev *pcie_find_root_port(struct pci_dev *dev) { - while (1) { - if (!pci_is_pcie(dev)) - break; - if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) - return dev; - if (!dev->bus->self) - break; - dev = dev->bus->self; + struct pci_dev *bridge = pci_upstream_bridge(dev); + + while (bridge) { + if (pci_pcie_type(bridge) == PCI_EXP_TYPE_ROOT_PORT) + return bridge; + bridge = pci_upstream_bridge(bridge); } + return NULL; } |