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linux-next/drivers/pci
Heiner Kallweit 923aa4c378 PCI/MSI: Set IRQCHIP_ONESHOT_SAFE for PCI-MSI irqchips
If flag IRQCHIP_ONESHOT_SAFE isn't set for an irqchip and we have a
threaded interrupt with no primary handler, flag IRQF_ONESHOT needs to be
set for the interrupt, causing some overhead in the threaded interrupt
handler.  For more detailed explanation also check following comment in
__setup_irq():

  The interrupt was requested with handler = NULL, so we use the default
  primary handler for it. But it does not have the oneshot flag set.  In
  combination with level interrupts this is deadly, because the default
  primary handler just wakes the thread, then the irq lines is reenabled,
  but the device still has the level irq asserted.  Rinse and repeat....

  While this works for edge type interrupts, we play it safe and reject
  unconditionally because we can't say for sure which type this interrupt
  really has.  The type flags are unreliable as the underlying chip
  implementation can override them.

Another comment in __setup_irq() gives a hint already that this
overhead can be avoided for PCI-MSI:

  Some irq chips like MSI based interrupts are per se one shot safe.  Check
  the chip flags, so we can avoid the unmask dance at the end of the
  threaded handler for those.

Following this let's mark all PCI-MSI irqchips as oneshot-safe.

See also discussion here:
https://lkml.kernel.org/r/alpine.DEB.2.21.1808032136490.1658@nanos.tec.linutronix.de

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-08-14 16:11:02 -05:00
..
controller - Error path bug fix for overflow tests (Dan) 2018-06-12 18:28:00 -07:00
endpoint Merge branch 'lorenzo/pci/endpoint' 2018-06-06 16:10:30 -05:00
hotplug Merge branch 'pci/hotplug' 2018-06-06 16:10:10 -05:00
pcie PCI/AER: Use "PCI Express" consistently in Kconfig text 2018-06-11 08:11:47 -05:00
switch vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
access.c Merge branch 'pci/vpd' 2018-04-04 13:28:40 -05:00
ats.c PCI: Add "pci=noats" boot parameter 2018-05-10 17:56:02 -05:00
bus.c PCI: remove CONFIG_PCI_BUS_ADDR_T_64BIT 2018-05-09 06:57:18 +02:00
ecam.c PCI: Add SPDX GPL-2.0 to replace GPL v2 boilerplate 2018-01-28 15:48:29 -06:00
host-bridge.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
iov.c PCI/IOV: Allow PF drivers to limit total_VFs to 0 2018-05-25 08:18:34 -05:00
irq.c PCI: Add wrappers for dev_printk() 2018-01-18 12:55:24 -06:00
Kconfig PCI: Collect all native drivers under drivers/pci/controller/ 2018-06-08 07:50:11 -05:00
Makefile PCI: Collect all native drivers under drivers/pci/controller/ 2018-06-08 07:50:11 -05:00
mmap.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
msi.c PCI/MSI: Set IRQCHIP_ONESHOT_SAFE for PCI-MSI irqchips 2018-08-14 16:11:02 -05:00
of.c PCI: Rework of_pci_get_host_bridge_resources() to devm_of_pci_get_host_bridge_resources() 2018-05-30 11:35:13 -05:00
pci-acpi.c PCI: shpchp: Add shpchp_is_native() 2018-06-04 12:08:06 -05:00
pci-driver.c pci-v4.18-changes 2018-06-07 12:45:58 -07:00
pci-label.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
pci-mid.c PCI: Add SPDX GPL-2.0 to replace GPL v2 boilerplate 2018-01-28 15:48:29 -06:00
pci-pf-stub.c PCI/IOV: Add pci-pf-stub driver for PFs that only enable VFs 2018-04-24 16:47:16 -05:00
pci-stub.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
pci-sysfs.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
pci.c pci-v4.18-changes 2018-06-07 12:45:58 -07:00
pci.h Merge branch 'lorenzo/pci/dwc' 2018-06-06 16:10:27 -05:00
probe.c Merge branch 'pci/resource' 2018-06-06 16:10:18 -05:00
proc.c proc: introduce proc_create_seq{,_data} 2018-05-16 07:23:35 +02:00
quirks.c Merge branch 'pci/trivial' 2018-06-06 16:10:51 -05:00
remove.c PCI: Add SPDX GPL-2.0 when no license was specified 2018-01-26 11:45:16 -06:00
rom.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
search.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
setup-bus.c PCI: Move resource distribution for single bridge outside loop 2018-06-04 12:08:06 -05:00
setup-irq.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
setup-res.c PCI: Remove messages about reassigning resources 2018-04-11 08:46:50 -05:00
slot.c Merge branch 'pci/misc' 2018-04-04 13:27:45 -05:00
syscall.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00
vc.c Merge branch 'pci/spdx' into next 2018-02-01 11:40:07 -06:00
vpd.c pci-v4.17-changes 2018-04-06 18:31:06 -07:00
xen-pcifront.c PCI: Tidy comments 2018-03-19 14:20:43 -05:00