https://github.com/torvalds/linux
Revision c60f7d5a8e7c639de5d9dfe07e1e91d302d506e4 authored by Linus Torvalds on 14 March 2014, 04:32:16 UTC, committed by Linus Torvalds on 14 March 2014, 04:32:16 UTC
Pull drm fixes from Dave Airlie: "Pretty minor set of fixes for radeon, ttm and vmwgfx. The ttm ones are a regression and an oops seen on server chipsets" * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: drm/vmwgfx: Fix a surface reference corner-case in legacy emulation mode drm/radeon/cik: properly set compute ring status on disable drm/radeon/cik: stop the sdma engines in the enable() function drm/radeon/cik: properly set sdma ring status on disable drm/radeon: fix runpm disabling on non-PX harder drm/ttm: don't oops if no invalidate_caches() drm/ttm: Work around performance regression with VM_PFNMAP
Tip revision: c60f7d5a8e7c639de5d9dfe07e1e91d302d506e4 authored by Linus Torvalds on 14 March 2014, 04:32:16 UTC
Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
Tip revision: c60f7d5
IRQ.txt
What is an IRQ?
An IRQ is an interrupt request from a device.
Currently they can come in over a pin, or over a packet.
Several devices may be connected to the same pin thus
sharing an IRQ.
An IRQ number is a kernel identifier used to talk about a hardware
interrupt source. Typically this is an index into the global irq_desc
array, but except for what linux/interrupt.h implements the details
are architecture specific.
An IRQ number is an enumeration of the possible interrupt sources on a
machine. Typically what is enumerated is the number of input pins on
all of the interrupt controller in the system. In the case of ISA
what is enumerated are the 16 input pins on the two i8259 interrupt
controllers.
Architectures can assign additional meaning to the IRQ numbers, and
are encouraged to in the case where there is any manual configuration
of the hardware involved. The ISA IRQs are a classic example of
assigning this kind of additional meaning.
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