linux-kernel - [PATCH 2/7] PCI: Introduce pcie_upstream

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Message-Id: <20170926141720.25067-3-mika.westerberg@linux.intel.com>
Date:   Tue, 26 Sep 2017 17:17:15 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     Ashok Raj <ashok.raj@...el.com>,
        Keith Busch <keith.busch@...el.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Lukas Wunner <lukas@...ner.de>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <yehezkel.bernat@...el.com>,
        Mario.Limonciello@...l.com,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/7] PCI: Introduce pcie_upstream_port()

This helper allows to determine whether the PCI device is PCIe upstream
port.

Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 include/linux/pci.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/pci.h b/include/linux/pci.h
index f68c58a93dd0..4397692be538 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -2042,6 +2042,17 @@ static inline int pci_pcie_type(const struct pci_dev *dev)
 	return (pcie_caps_reg(dev) & PCI_EXP_FLAGS_TYPE) >> 4;
 }
 
+/**
+ * pcie_upstream_port - is the PCI device PCIe upstream port
+ * @dev: PCI device
+ */
+static inline bool pcie_upstream_port(struct pci_dev *dev)
+{
+	if (!pci_is_pcie(dev))
+		return false;
+	return pci_pcie_type(dev) == PCI_EXP_TYPE_UPSTREAM;
+}
+
 static inline struct pci_dev *pcie_find_root_port(struct pci_dev *dev)
 {
 	while (1) {
-- 
2.14.1