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[SPARC64]: Virtualize IRQ numbers.

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Inspired by PowerPC XICS interrupt support code.

All IRQs are virtualized in order to keep NR_IRQS from needing
to be too large.  Interrupts on sparc64 are arbitrary 11-bit
values, but we don't need to define NR_IRQS to 2048 if we
virtualize the IRQs.

As PCI and SBUS controller drivers build device IRQs, we divy
out virtual IRQ numbers incrementally starting at 1.  Zero is
a special virtual IRQ used for the timer interrupt.

So device drivers all see virtual IRQs, and all the normal
interfaces such as request_irq(), enable_irq(), etc. translate
that into a real IRQ number in order to configure the IRQ.

At this point knowledge of the struct ino_bucket is almost
entirely contained within arch/sparc64/kernel/irq.c  There are
a few small bits in the PCI controller drivers that need to
be swept away before we can remove ino_bucket's definition
out of asm-sparc64/irq.h and privately into kernel/irq.c

Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
David S. Miller 2006-06-20 01:22:35 -07:00
commit 8047e247c8
6 changed files with 242 additions and 146 deletions
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13
include/asm-sparc64/irq.h
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@ -98,13 +98,22 @@ extern struct ino_bucket ivector_table[NUM_IVECS];
#define __bucket(irq) ((struct ino_bucket *)(unsigned long)(irq))
#define __irq(bucket) ((unsigned int)(unsigned long)(bucket))
#define NR_IRQS 16
/* The largest number of unique interrupt sources we support.
* If this needs to ever be larger than 255, you need to change
* the type of ino_bucket->virt_irq as appropriate.
*
* ino_bucket->virt_irq allocation is made during {sun4v_,}build_irq().
*/
#define NR_IRQS 255
extern void irq_install_pre_handler(int virt_irq,
void (*func)(struct ino_bucket *, void *, void *),
void *arg1, void *arg2);
#define irq_canonicalize(irq) (irq)
extern void disable_irq(unsigned int);
#define disable_irq_nosync disable_irq
extern void enable_irq(unsigned int);
extern unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap);
extern unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap, unsigned char flags);
extern unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino, unsigned char flags);
extern unsigned int sbus_build_irq(void *sbus, unsigned int ino);