[RFT PATCH v2 00/42] PCI: ARM/ARM64: remove pci_fixup_irqs() usage
Lorenzo Pieralisi
lorenzo.pieralisi at arm.com
Tue Jun 20 07:44:40 PDT 2017
On Mon, Jun 19, 2017 at 06:12:17PM -0500, Bjorn Helgaas wrote:
> On Thu, Jun 08, 2017 at 03:13:00PM +0100, Lorenzo Pieralisi wrote:
> > v1 -> v2
> >
> > - Split pci_fixup_irqs() removal in several patches
> > - Embedded pci_register_host_bridge() in pci_scan_root_bus_bridge()
> > - Refactored iproc, faraday and xilinx-nwl host bridges in preparation
> > for irq fixup removal
> > - Converted all DT PCI host bridge drivers to pci_scan_root_bus_bridge()
> > - Dropped RFC tag
> > - Added devm_pci_alloc_host_bridge() interface
> > - Rebased against v4.12-rc3
> >
> > v1: http://marc.info/?l=linux-pci&m=149320545522205&w=2
> >
> > Current pci_fixup_irqs() usage on ARM/ARM64 host controller drivers is
> > flawed in that pci_fixup_irqs() allocates IRQs for all PCI devices present
> > in a system; those PCI devices possibly belong to different PCI bus trees
> > (and possibly rooted at different host bridges) and may well be enabled
> > (ie probed and bound to a driver) by the time pci_fixup_irqs() is called
> > when probing a given host bridge driver.
> >
> > Furthermore, current kernel code relying on pci_fixup_irqs() to
> > assign legacy PCI IRQs to devices does not work at all for
> > hotplugged devices in that the code carrying out the IRQ fixup
> > is called at host bridge driver probe time, which just cannot take
> > into account devices hotplugged after system has booted.
> >
> > By leveraging Matthew Minter's patch series (and its purpose):
> >
> > http://lkml.kernel.org/r/1445576642-29624-2-git-send-email-matt@masarand.com
> >
> > this series[1] adds IRQs mapping and swizzling primitives to
> > the struct pci_host_bridge which allows IRQs to be allocated for
> > for a device at probe time with host bridge specific functions,
> > fixing the aforementioned limitations.
> >
> > Current series remove pci_fixup_irqs() usage on ARM/ARM64; removal
> > can be extended to other architectures provided the IRQs map/swizzle
> > functions are set-up properly in the respective host bridges
> > set-up/probe paths.
> >
> > Tested on kvmtool with PCI host generic.
> >
> > [1] git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/linux.git pci/pci-fixup-irqs-removal-v2
> >
> > Lorenzo Pieralisi (37):
> > PCI: xilinx-nwl: Remove nwl_pcie_enable_msi() unused bus parameter
> > drivers: pci: host: iproc: Convert link check to raw PCI config
> > accessors
> > drivers: pci: host: ftpci100: convert IRQ masking to raw PCI config
> > accessors
> > PCI: Initialize bridge release function at bridge allocation
> > PCI: Add pci_free_host_bridge interface
> > PCI: Add devm_pci_alloc_host_bridge() interface
> > drivers: pci: host: ftpci100: Fix host bridge memory leakage
> > drivers: pci: host: tegra: Fix host bridge memory leakage
> > PCI: Introduce pci_scan_root_bus_bridge()
> > PCI: Make pci_register_host_bridge() PCI core internal
> > ARM: PCI: bios32: Convert PCI scan API to pci_scan_root_bus_bridge()
> > PCI: designware: Convert PCI scan API to pci_scan_root_bus_bridge()
> > PCI: aardvark: Convert PCI scan API to pci_scan_root_bus_bridge()
> > PCI: rcar: Convert PCI scan API to pci_scan_root_bus_bridge()
> > PCI: iproc: Convert PCI scan API to pci_scan_root_bus_bridge()
> > PCI: versatile: Convert PCI scan API to pci_scan_root_bus_bridge()
> > PCI: altera: Convert PCI scan API to pci_scan_root_bus_bridge()
> > PCI: xilinx: Convert PCI scan API to pci_scan_root_bus_bridge()
> > PCI: xgene: Convert PCI scan API to pci_scan_root_bus_bridge()
> > PCI: host-common: Convert PCI scan API to pci_scan_root_bus_bridge()
> > PCI: rockchip: Convert PCI scan API to pci_scan_root_bus_bridge()
> > PCI: xilinx-nwl: Convert PCI scan API to pci_scan_root_bus_bridge()
> > PCI: Remove pci_scan_root_bus_msi()
> > ARM: PCI: Remove pci_fixup_irqs() call for bios32 host controllers
> > PCI: tegra: Drop pci_fixup_irqs()
> > PCI: xilinx: Drop pci_fixup_irqs()
> > PCI: rcar: Drop pci_fixup_irqs()
> > PCI: iproc: Drop pci_fixup_irqs()
> > PCI: designware-host: Drop pci_fixup_irqs()
> > PCI: ftpci100: Drop pci_fixup_irqs()
> > PCI: host-common: Drop pci_fixup_irqs()
> > PCI: versatile: Drop pci_fixup_irqs()
> > PCI: altera: Drop pci_fixup_irqs()
> > PCI: xgene: Move to struct pci_host_bridge IRQ mapping functions
> > PCI: rockchip: Move to struct pci_host_bridge IRQ mapping functions
> > PCI: xilinx-nwl: Move to struct pci_host_bridge IRQ mapping functions
> > ARM64: PCI: Drop DT IRQ allocation from pcibios_alloc_irq()
> >
> > Matthew Minter (5):
> > PCI: Build setup-irq.o on all arches
> > PCI: Add IRQ mapping function pointers to pci_host_bridge struct
> > PCI: Add pci_assign_irq() function and have pci_fixup_irqs() use it
> > OF/PCI: Update of_irq_parse_and_map_pci() comment
> > PCI: Add a call to pci_assign_irq() in pci_device_probe()
> >
> > Documentation/driver-model/devres.txt | 1 +
> > arch/arm/include/asm/mach/pci.h | 3 +-
> > arch/arm/kernel/bios32.c | 43 +++++++----
> > arch/arm/mach-dove/pcie.c | 33 +++++---
> > arch/arm/mach-iop13xx/pci.c | 31 +++++---
> > arch/arm/mach-iop13xx/pci.h | 3 +-
> > arch/arm/mach-mv78xx0/pcie.c | 8 +-
> > arch/arm/mach-orion5x/common.h | 3 +-
> > arch/arm/mach-orion5x/pci.c | 39 ++++++----
> > arch/arm64/kernel/pci.c | 10 +--
> > drivers/of/of_pci_irq.c | 3 +-
> > drivers/pci/Makefile | 17 +----
> > drivers/pci/dwc/pcie-designware-host.c | 43 ++++++-----
> > drivers/pci/host/pci-aardvark.c | 21 +++--
> > drivers/pci/host/pci-ftpci100.c | 50 +++++++-----
> > drivers/pci/host/pci-host-common.c | 27 +++++--
> > drivers/pci/host/pci-tegra.c | 9 +--
> > drivers/pci/host/pci-versatile.c | 22 +++++-
> > drivers/pci/host/pci-xgene.c | 23 ++++--
> > drivers/pci/host/pcie-altera.c | 24 ++++--
> > drivers/pci/host/pcie-iproc-bcma.c | 7 +-
> > drivers/pci/host/pcie-iproc-platform.c | 7 +-
> > drivers/pci/host/pcie-iproc.c | 135 +++++++++++++++++++++++----------
> > drivers/pci/host/pcie-rcar.c | 40 ++++++----
> > drivers/pci/host/pcie-rockchip.c | 24 ++++--
> > drivers/pci/host/pcie-xilinx-nwl.c | 34 ++++++---
> > drivers/pci/host/pcie-xilinx.c | 34 +++++----
> > drivers/pci/pci-driver.c | 2 +
> > drivers/pci/probe.c | 105 ++++++++++++++++++-------
> > drivers/pci/setup-irq.c | 45 ++++++++---
> > include/linux/pci.h | 12 +--
> > 31 files changed, 565 insertions(+), 293 deletions(-)
>
> This is awesome! I put these on pci/enumeration with the acks received so
> far. I hope we can merge these for v4.13, so please take a look at your
> drivers and test if possible.
Thank you very much Bjorn. Yes it would help me a lot if CC'ed people
can help me test it (and also Matt's patch [PATCH 26] reworked
pci_fixup_irqs() on top of struct pci_host_bridge hooks so even if they
should not be affected all arches other than ARM/ARM64 should be tested
too - I have not extended the CC list since it is huge already).
Thanks !
Lorenzo
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