From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Bjorn Helgaas <bhelgaas@google.com>
Cc: Ashok Raj <ashok.raj@intel.com>,
Keith Busch <keith.busch@intel.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
Lukas Wunner <lukas@wunner.de>,
Michael Jamet <michael.jamet@intel.com>,
Yehezkel Bernat <yehezkel.bernat@intel.com>,
Mario.Limonciello@dell.com,
Mika Westerberg <mika.westerberg@linux.intel.com>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 2/7] PCI: Introduce pcie_upstream_port()
Date: Tue, 26 Sep 2017 17:17:15 +0300 [thread overview]
Message-ID: <20170926141720.25067-3-mika.westerberg@linux.intel.com> (raw)
In-Reply-To: <20170926141720.25067-1-mika.westerberg@linux.intel.com>
This helper allows to determine whether the PCI device is PCIe upstream
port.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.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
next prev parent reply other threads:[~2017-09-26 14:17 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-26 14:17 [PATCH 0/7] PCI: Improvements for native PCIe hotplug Mika Westerberg
2017-09-26 14:17 ` [PATCH 1/7] PCI: Do not allocate more buses than available in parent Mika Westerberg
2017-09-26 14:17 ` Mika Westerberg [this message]
2017-09-26 14:17 ` [PATCH 3/7] PCI: Distribute available buses to hotplug capable PCIe downstream ports Mika Westerberg
2017-10-11 23:32 ` Bjorn Helgaas
2017-10-12 9:50 ` David Laight
2017-10-12 12:47 ` Mika Westerberg
2017-10-12 18:32 ` Bjorn Helgaas
2017-10-13 10:26 ` Mika Westerberg
2017-09-26 14:17 ` [PATCH 4/7] PCI: Distribute available resources " Mika Westerberg
2017-09-26 14:17 ` [PATCH 5/7] PCI: pciehp: Fix race condition handling surprise link down Mika Westerberg
2017-09-26 14:17 ` [PATCH 6/7] PCI: pciehp: Do not clear Presence Detect Changed during initialization Mika Westerberg
2017-09-26 14:17 ` [PATCH 7/7] PCI: pciehp: Check that the device is really present before touching it Mika Westerberg
2017-10-09 8:47 ` [PATCH 0/7] PCI: Improvements for native PCIe hotplug Mika Westerberg
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