On x86 platforms, IRQ number are statically allocated to IOAPIC pins at boot. There are two issues with this design. First it causes trouble to IOAPIC hotplug because we need to allocate a block of IRQ numbers for each IOAPIC. Second it may waste IRQ nubmers even if some IOAPIC pins are not used because IRQ numbers are statically assigned. This patchset tries to enable dynamic IRQ number allocation for IOAPIC by adopting the irqdomain framework, it solves the two issues mentioned above. It also simplifies the IOAPIC driver by consolidating ways to program IOAPIC pins with the irqdomain map interface. We will enhance the IOAPIC driver core to support ACPI based IOAPIC hotplug once the IOAPIC driver has been converted to irqdomain. This patchset applies to tip/irq/core and you may pull from https://github.com/jiangliu/linux.git ioapic/irqdomain The patchset has been tested on a two socket 64 bit Intel platforms with: 1) ACPI and mpparse enabled (boot successfully) 2) Mpparse enabled with ACPI disabled (boot successfully) 3) ACPI enabled with Mpparse disabled (boot successfully) 4) boot parameter "pci=nomsi" 5) boot parameter "acpi=noirq" 6) boot parameter "pci=noacpi" 7) UP mode (SMP disabled) It has also been tested on an one socket laptop with 32bit Ubuntu with: 1) ACPI and mpparse enabled (boot successfully) 2) Mpparse enabled with ACPI disabled (boot successfully) 3) ACPI enabled with Mpparse disabled (boot successfully) 4) boot parameter "pci=nomsi" 5) boot parameter "acpi=noirq" 6) boot parameter "pci=noacpi" 7) UP mode (SMP disabled) 8) UP mode with IOAPIC disabled It also builds successfully (but without booting due to hardware resource constraints) for 32 bit platforms with following configuraitons: 1) SFI enabled 2) devicetree (CE4100) enabled V2->V3 1) Implement irqdomain unmap() interface and free IRQ when it's not used 2) Fix posssible conflicts with native and PV Xen IRQ management 3) Fix build errors on CE4100 4) Code quality and readability improvement V1->V2 1) Rebase to tip/irq/core 2) reorder patches to put bugfixes at the head 3) fix bug in handling shared ISA IRQs 4) refine commit messages Patch 1 is simple bugfix for MSI. Patch 2-16 are trivial code improvements, bugfixes and preparation. Patch 17-24 enable basic irqdomain support and IRQ number dynamic allocation. Patch 25-29 consoldate the way to program IOAPIC pins by using irqdomain map() interface. Patch 30-31 cleans up unused interfaces and functions in IOAPIC driver. Patch 32-37 implement irqdoamin unmap() interfaces and free IRQ when it's not used Tests and comments are warmly welcomed! Jiang Liu (37): x86, irq: update high address field when updating affinity for MSI IRQ genirq, trivial: improve documentation to match current implementation x86, mpparse: use pr_lvl() helper utilities to replace printk(KERN_LVL) x86, mpparse: simplify arch/x86/include/asm/mpspec.h x86, PCI, ACPI: use kmalloc_node() to optimize for performance x86, acpi, irq: kill static function irq_to_gsi() x86, ACPI, trivial: minor improvements to arch/x86/kernel/acpi/boot.c x86, ACPI, irq: enhance error handling in function acpi_register_gsi() x86, ACPI, irq: fix possible eror in GSI to IRQ mapping for legacy IRQ x86, irq, trivial: minor improvements of IRQ related code x86, ioapic: kill unused global variable timer_through_8259 x86, ioapic: kill static variable nr_irqs_gsi x86, ioapic: introduce helper utilities to walk ioapics and pins x86, ioapic: use irq_cfg() instead of irq_get_chip_data() for better readability x86, irq: reorganize IO_APIC_get_PCI_irq_vector() to prepare for irqdomain x86, irq: introduce some helper utilities to improve readability x86, ACPI, irq: consolidate algorithm of mapping (ioapic, pin) to IRQ number x86, irq, ACPI: change __acpi_register_gsi to return IRQ number instead of GSI x86, irq: introduce mechanisms to support dynamically allocate IRQ for IOAPIC x86, irq: enhance mp_register_ioapic() to support irqdomain x86, ACPI, irq: provide basic irqdomain support x86, mpparse, irq: provide basic irqdomain support x86, SFI, irq: provide basic irqdomain support x86, devicetree, irq: use common mechanism to support irqdomain x86, irq: introduce two helper functions to support irqdomain map operation x86, irq, ACPI: use common irqdomain map interface to program IOAPIC pins x86, irq, mpparse: use common irqdomain map interface to program IOAPIC pins x86, irq, SFI: use common irqdomain map interface to program IOAPIC pins x86, irq, devicetree: use common irqdomain map interface to program IOAPIC pins x86, irq: clean up unused IOAPIC interface x86, irq: simplify the way to handle ISA IRQ genirq: export irq_domain_disassociate() to architecture interrupt drivers x86, irq: introduce helper functions to release IOAPIC pin x86, irq, ACPI: release IOAPIC pin when PCI device is disabled x86, irq, mpparse: release IOAPIC pin when PCI device is disabled x86, irq, SFI: release IOAPIC pin when PCI device is disabled x86, irq, devicetree: release IOAPIC pin when PCI device is disabled Documentation/IRQ-domain.txt | 3 +- arch/x86/Kconfig | 1 + arch/x86/include/asm/apic.h | 4 +- arch/x86/include/asm/hardirq.h | 3 - arch/x86/include/asm/io_apic.h | 49 +-- arch/x86/include/asm/mpspec.h | 13 - arch/x86/include/asm/prom.h | 2 - arch/x86/kernel/acpi/boot.c | 231 ++++++------- arch/x86/kernel/apic/apic.c | 2 +- arch/x86/kernel/apic/io_apic.c | 681 +++++++++++++++++++++++-------------- arch/x86/kernel/devicetree.c | 96 +----- arch/x86/kernel/irqinit.c | 6 - arch/x86/kernel/mpparse.c | 98 +++--- arch/x86/pci/acpi.c | 6 +- arch/x86/pci/intel_mid_pci.c | 27 +- arch/x86/pci/irq.c | 15 +- arch/x86/platform/intel-mid/sfi.c | 56 ++- arch/x86/platform/sfi/sfi.c | 13 +- drivers/acpi/pci_irq.c | 3 +- include/linux/irqdomain.h | 2 + kernel/irq/internals.h | 2 +- kernel/irq/irqdomain.c | 8 +- 22 files changed, 715 insertions(+), 606 deletions(-) -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
