[SPARC64]: Virtualize IRQ numbers.
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>
diff --git a/arch/sparc64/kernel/pci_sabre.c b/arch/sparc64/kernel/pci_sabre.c
index caa7aee..846c120 100644
--- a/arch/sparc64/kernel/pci_sabre.c
+++ b/arch/sparc64/kernel/pci_sabre.c
@@ -544,10 +544,10 @@
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 @@
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. */