diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2014-05-07 19:44:06 +0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2014-05-16 16:05:18 +0400 |
| commit | b1ee544174fd0eb28a7770403b9577fd70f1cd3d (patch) | |
| tree | 1eedb15e5d93d76ee341f3eeeab9d8198912cf79 | |
| parent | 7b6ef1262549f6afc5c881aaef80beb8fd15f908 (diff) | |
| download | linux-b1ee544174fd0eb28a7770403b9577fd70f1cd3d.tar.xz | |
x86: Implement arch_setup/teardown_hwirq()
This is just a cleanup to get rid of the create/destroy_irq variants
which were designed in hell.
The long term solution for x86 is to switch over to irq domains and
cleanup the whole vector allocation mess.
The generic irq_alloc_hwirqs() interface deliberately prevents
multi-MSI vector allocation to further enforce the irq domain
conversion (aside of the desire to support ioapic hotplug).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Grant Likely <grant.likely@linaro.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: x86@kernel.org
Link: http://lkml.kernel.org/r/20140507154334.482904047@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | arch/x86/Kconfig | 1 | ||||
| -rw-r--r-- | arch/x86/kernel/apic/io_apic.c | 33 |
2 files changed, 34 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 25d2c6f7325e..47247708c9eb 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -831,6 +831,7 @@ config X86_LOCAL_APIC config X86_IO_APIC def_bool y depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC || PCI_MSI + select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ config X86_REROUTE_FOR_BROKEN_BOOT_IRQS bool "Reroute for broken boot IRQs" diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index 992060e09897..b7175c0c552c 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -3010,6 +3010,39 @@ void destroy_irqs(unsigned int irq, unsigned int count) destroy_irq(irq + i); } +int arch_setup_hwirq(unsigned int irq, int node) +{ + struct irq_cfg *cfg; + unsigned long flags; + int ret; + + cfg = alloc_irq_cfg(irq, node); + if (!cfg) + return -ENOMEM; + + raw_spin_lock_irqsave(&vector_lock, flags); + ret = __assign_irq_vector(irq, cfg, apic->target_cpus()); + raw_spin_unlock_irqrestore(&vector_lock, flags); + + if (!ret) + irq_set_chip_data(irq, cfg); + else + free_irq_cfg(irq, cfg); + return ret; +} + +void arch_teardown_hwirq(unsigned int irq) +{ + struct irq_cfg *cfg = irq_get_chip_data(irq); + unsigned long flags; + + free_remapped_irq(irq); + raw_spin_lock_irqsave(&vector_lock, flags); + __clear_irq_vector(irq, cfg); + raw_spin_unlock_irqrestore(&vector_lock, flags); + free_irq_cfg(irq, cfg); +} + /* * MSI message composition */ |