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Will Deacon 1a01753ed9 ARM: gic: use handle_fasteoi_irq for SPIs 
Currently, the gic uses handle_level_irq for handling SPIs (Shared
Peripheral Interrupts), requiring active interrupts to be masked at
the distributor level during IRQ handling.

On a virtualised system, only the CPU interfaces are virtualised in
hardware. Accesses to the distributor must be trapped by the
hypervisor, adding latency to the critical interrupt path in Linux.

This patch modifies the GIC code to use handle_fasteoi_irq for handling
interrupts, which only requires us to signal EOI to the CPU interface
when handling is complete. Cascaded IRQ handling is also updated to use
the chained IRQ enter/exit functions to honour the flow control of the
parent chip.

Note that commit 846afbd1 ("GIC: Dont disable INT in ack callback")
broke cascading interrupts by forgetting to add IRQ masking. This is
no longer an issue because the unmask call is now unnecessary.

Tested on Versatile Express and Realview EB (1176 w/ cascaded GICs).

Tested-and-reviewed-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Tested-and-acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2011-05-11 16:04:17 +01:00
..
alpha alpha: Fix uninitialized value in read_persistent_clock. 2011-04-17 14:41:30 -07:00
arm ARM: gic: use handle_fasteoi_irq for SPIs 2011-05-11 16:04:17 +01:00
avr32 avr32: add ATAG_BOARDINFO 2011-04-13 15:46:59 +02:00
blackfin Blackfin: SMP: fix cache flush loop 2011-04-13 19:34:06 -04:00
cris Fix common misspellings 2011-03-31 11:26:23 -03:00
frv Fix common misspellings 2011-03-31 11:26:23 -03:00
h8300 genirq: Remove the now obsolete config options and select statements 2011-03-30 14:13:23 +02:00
ia64 Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6 2011-04-07 11:14:49 -07:00
m32r Fix common misspellings 2011-03-31 11:26:23 -03:00
m68k m68k/mm: Set all online nodes in N_NORMAL_MEMORY 2011-04-27 17:36:00 +02:00
microblaze usb: Fix Kconfig unmet dependencies for Microblaze EHCI 2011-04-13 15:43:59 -07:00
mips Fix common misspellings 2011-03-31 11:26:23 -03:00
mn10300 Fix common misspellings 2011-03-31 11:26:23 -03:00
parisc [PARISC] set memory ranges in N_NORMAL_MEMORY when onlined 2011-04-21 09:32:38 -05:00
powerpc hw_breakpoints, powerpc: Fix CONFIG_HAVE_HW_BREAKPOINT off-case in ptrace_set_debugreg() 2011-05-06 11:24:46 +02:00
s390 [S390] irqstats: fix counting of pfault, dasd diag and virtio irqs 2011-04-29 10:42:25 +02:00
score Fix common misspellings 2011-03-31 11:26:23 -03:00
sh sh, hw_breakpoints: Fix racy access to ptrace breakpoints 2011-04-25 17:36:12 +02:00
sparc Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6 2011-04-07 11:14:49 -07:00
tile Fix common misspellings 2011-03-31 11:26:23 -03:00
um um: adjust current_thread_info() for newer gcc versions 2011-04-28 11:28:21 -07:00
unicore32 Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6 2011-04-07 11:14:49 -07:00
x86 perf events, x86: Fix Intel Nehalem and Westmere last level cache event definitions 2011-05-06 11:24:48 +02:00
xtensa xtensa: Fixup irq conversion fallout and nmi_count 2011-04-20 00:32:09 +02:00
.gitignore
Kconfig oprofile, s390: Cleanups 2011-03-16 14:30:40 +01:00