Merge tag 'pci-v4.12-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI updates from Bjorn Helgaas:

 - add framework for supporting PCIe devices in Endpoint mode (Kishon
   Vijay Abraham I)

 - use non-postable PCI config space mappings when possible (Lorenzo
   Pieralisi)

 - clean up and unify mmap of PCI BARs (David Woodhouse)

 - export and unify Function Level Reset support (Christoph Hellwig)

 - avoid FLR for Intel 82579 NICs (Sasha Neftin)

 - add pci_request_irq() and pci_free_irq() helpers (Christoph Hellwig)

 - short-circuit config access failures for disconnected devices (Keith
   Busch)

 - remove D3 sleep delay when possible (Adrian Hunter)

 - freeze PME scan before suspending devices (Lukas Wunner)

 - stop disabling MSI/MSI-X in pci_device_shutdown() (Prarit Bhargava)

 - disable boot interrupt quirk for ASUS M2N-LR (Stefan Assmann)

 - add arch-specific alignment control to improve device passthrough by
   avoiding multiple BARs in a page (Yongji Xie)

 - add sysfs sriov_drivers_autoprobe to control VF driver binding
   (Bodong Wang)

 - allow slots below PCI-to-PCIe "reverse bridges" (Bjorn Helgaas)

 - fix crashes when unbinding host controllers that don't support
   removal (Brian Norris)

 - add driver for MicroSemi Switchtec management interface (Logan
   Gunthorpe)

 - add driver for Faraday Technology FTPCI100 host bridge (Linus
   Walleij)

 - add i.MX7D support (Andrey Smirnov)

 - use generic MSI support for Aardvark (Thomas Petazzoni)

 - make Rockchip driver modular (Brian Norris)

 - advertise 128-byte Read Completion Boundary support for Rockchip
   (Shawn Lin)

 - advertise PCI_EXP_LNKSTA_SLC for Rockchip root port (Shawn Lin)

 - convert atomic_t to refcount_t in HV driver (Elena Reshetova)

 - add CPU IRQ affinity in HV driver (K. Y. Srinivasan)

 - fix PCI bus removal in HV driver (Long Li)

 - add support for ThunderX2 DMA alias topology (Jayachandran C)

 - add ThunderX pass2.x 2nd node MCFG quirk (Tomasz Nowicki)

 - add ITE 8893 bridge DMA alias quirk (Jarod Wilson)

 - restrict Cavium ACS quirk only to CN81xx/CN83xx/CN88xx devices
   (Manish Jaggi)

* tag 'pci-v4.12-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (146 commits)
  PCI: Don't allow unbinding host controllers that aren't prepared
  ARM: DRA7: clockdomain: Change the CLKTRCTRL of CM_PCIE_CLKSTCTRL to SW_WKUP
  MAINTAINERS: Add PCI Endpoint maintainer
  Documentation: PCI: Add userguide for PCI endpoint test function
  tools: PCI: Add sample test script to invoke pcitest
  tools: PCI: Add a userspace tool to test PCI endpoint
  Documentation: misc-devices: Add Documentation for pci-endpoint-test driver
  misc: Add host side PCI driver for PCI test function device
  PCI: Add device IDs for DRA74x and DRA72x
  dt-bindings: PCI: dra7xx: Add DT bindings to enable unaligned access
  PCI: dwc: dra7xx: Workaround for errata id i870
  dt-bindings: PCI: dra7xx: Add DT bindings for PCI dra7xx EP mode
  PCI: dwc: dra7xx: Add EP mode support
  PCI: dwc: dra7xx: Facilitate wrapper and MSI interrupts to be enabled independently
  dt-bindings: PCI: Add DT bindings for PCI designware EP mode
  PCI: dwc: designware: Add EP mode support
  Documentation: PCI: Add binding documentation for pci-test endpoint function
  ixgbe: Use pcie_flr() instead of duplicating it
  IB/hfi1: Use pcie_flr() instead of duplicating it
  PCI: imx6: Fix spelling mistake: "contol" -> "control"
  ...

1 files changed, 60 insertions, 1 deletions

diff --git a/drivers/pci/irq.c b/drivers/pci/irq.c
index f9f2a0324ecc..83d30953ce19 100644
--- a/drivers/pci/irq.c
+++ b/drivers/pci/irq.c
@@ -1,7 +1,8 @@
 /*
- * PCI IRQ failure handing code
+ * PCI IRQ handling code
  *
  * Copyright (c) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
+ * Copyright (C) 2017 Christoph Hellwig.
  */
 
 #include <linux/acpi.h>
@@ -59,3 +60,61 @@ enum pci_lost_interrupt_reason pci_lost_interrupt(struct pci_dev *pdev)
         return PCI_LOST_IRQ_NO_INFORMATION;
 }
 EXPORT_SYMBOL(pci_lost_interrupt);
+
+/**
+ * pci_request_irq - allocate an interrupt line for a PCI device
+ * @dev:        PCI device to operate on
+ * @nr:         device-relative interrupt vector index (0-based).
+ * @handler:    Function to be called when the IRQ occurs.
+ *              Primary handler for threaded interrupts.
+ *              If NULL and thread_fn != NULL the default primary handler is
+ *              installed.
+ * @thread_fn:  Function called from the IRQ handler thread
+ *              If NULL, no IRQ thread is created
+ * @dev_id:     Cookie passed back to the handler function
+ * @fmt:        Printf-like format string naming the handler
+ *
+ * This call allocates interrupt resources and enables the interrupt line and
+ * IRQ handling. From the point this call is made @handler and @thread_fn may
+ * be invoked.  All interrupts requested using this function might be shared.
+ *
+ * @dev_id must not be NULL and must be globally unique.
+ */
+int pci_request_irq(struct pci_dev *dev, unsigned int nr, irq_handler_t handler,
+                irq_handler_t thread_fn, void *dev_id, const char *fmt, ...)
+{
+        va_list ap;
+        int ret;
+        char *devname;
+
+        va_start(ap, fmt);
+        devname = kvasprintf(GFP_KERNEL, fmt, ap);
+        va_end(ap);
+
+        ret = request_threaded_irq(pci_irq_vector(dev, nr), handler, thread_fn,
+                        IRQF_SHARED, devname, dev_id);
+        if (ret)
+                kfree(devname);
+        return ret;
+}
+EXPORT_SYMBOL(pci_request_irq);
+
+/**
+ * pci_free_irq - free an interrupt allocated with pci_request_irq
+ * @dev:        PCI device to operate on
+ * @nr:         device-relative interrupt vector index (0-based).
+ * @dev_id:     Device identity to free
+ *
+ * Remove an interrupt handler. The handler is removed and if the interrupt
+ * line is no longer in use by any driver it is disabled.  The caller must
+ * ensure the interrupt is disabled on the device before calling this function.
+ * The function does not return until any executing interrupts for this IRQ
+ * have completed.
+ *
+ * This function must not be called from interrupt context.
+ */
+void pci_free_irq(struct pci_dev *dev, unsigned int nr, void *dev_id)
+{
+        kfree(free_irq(pci_irq_vector(dev, nr), dev_id));
+}
+EXPORT_SYMBOL(pci_free_irq);