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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 <davem@davemloft.net>
This commit is contained in:
David S. Miller
2006-06-20 01:22:35 -07:00
parent 37cdcd9e82
commit 8047e247c8
6 changed files with 240 additions and 144 deletions
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18
arch/sparc64/kernel/pci_sabre.c
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@@ -544,10 +544,10 @@ static unsigned int sabre_irq_build(struct pci_pbm_info *pbm,
struct pci_dev *pdev,
unsigned int ino)
{
struct ino_bucket *bucket;
unsigned long imap, iclr;
unsigned long imap_off, iclr_off;
int inofixup = 0;
int virt_irq;
ino &= PCI_IRQ_INO;
if (ino < SABRE_ONBOARD_IRQ_BASE) {
@@ -573,23 +573,23 @@ static unsigned int sabre_irq_build(struct pci_pbm_info *pbm,
if ((ino & 0x20) == 0)
inofixup = ino & 0x03;
bucket = __bucket(build_irq(inofixup, iclr, imap));
bucket->flags |= IBF_PCI;
virt_irq = build_irq(inofixup, iclr, imap, IBF_PCI);
if (pdev) {
struct pcidev_cookie *pcp = pdev->sysdata;
if (pdev->bus->number != pcp->pbm->pci_first_busno) {
struct pci_controller_info *p = pcp->pbm->parent;
struct irq_desc *d = bucket->irq_info;
d->pre_handler = sabre_wsync_handler;
d->pre_handler_arg1 = pdev;
d->pre_handler_arg2 = (void *)
p->pbm_A.controller_regs + SABRE_WRSYNC;
irq_install_pre_handler(virt_irq,
sabre_wsync_handler,
pdev,
(void *)
p->pbm_A.controller_regs +
SABRE_WRSYNC);
}
}
return __irq(bucket);
return virt_irq;
}
/* SABRE error handling support. */