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authorLinus Torvalds <torvalds@linux-foundation.org>2016-12-02 03:44:42 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-02 03:44:42 +0300
commit4db5e636ddca41f4292359fdb3ac7cc4346a359a (patch)
tree7cad70c84b3a7a79dce4f77ec7f51ec4621d7f56 /include
parent2caceb3294a78c389b462e7e236a4e744a53a474 (diff)
parente42010d8207f9d15a605ceb8e321bcd9648071b0 (diff)
downloadlinux-4db5e636ddca41f4292359fdb3ac7cc4346a359a.tar.xz
Merge tag 'pci-v4.9-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Pull PCI fixes from Bjorn Helgaas: "PCI fixes: - Fix Read Completion Boundary setting, which fixes a boot failure on IBM x3850 with Mellanox MT27500 ConnectX-3 - Update some MAINTAINERS entries and email addresses" * tag 'pci-v4.9-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: PCI: Set Read Completion Boundary to 128 iff Root Port supports it (_HPX) PCI: Export pcie_find_root_port PCI: designware-plat: Update author email PCI: designware: Change maintainer to Joao Pinto MAINTAINERS: Add devicetree binding to PCI i.MX6 entry MAINTAINERS: Update Richard Zhu's email address
Diffstat (limited to 'include')
-rw-r--r--include/linux/pci.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 0e49f70dbd9b..a38772a85588 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1928,6 +1928,20 @@ static inline int pci_pcie_type(const struct pci_dev *dev)
return (pcie_caps_reg(dev) & PCI_EXP_FLAGS_TYPE) >> 4;
}
+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;
+ }
+ return NULL;
+}
+
void pci_request_acs(void);
bool pci_acs_enabled(struct pci_dev *pdev, u16 acs_flags);
bool pci_acs_path_enabled(struct pci_dev *start,