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x86/irq: optimize nr_irqs 

Impact: make nr_irqs depend more on cards used in a system

depend on nr_irq_gsi more, and have a ratio for MSI.

v2: make nr_irqs less than NR_VECTORS * nr_cpu_ids
    aka if only one cpu, we only can support nr_irqs = NR_VECTORS

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2009-02-08 16:18:03 -08:00 committed by Ingo Molnar
parent 8f9ca475c9
commit f1ee5548a6
1 changed files with 11 additions and 5 deletions
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16
arch/x86/kernel/io_apic.c
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@ -3479,9 +3479,9 @@ int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
sub_handle = 0;
list_for_each_entry(msidesc, &dev->msi_list, list) {
irq = create_irq_nr(irq_want);
irq_want++;
if (irq == 0)
return -1;
irq_want = irq + 1;
#ifdef CONFIG_INTR_REMAP
if (!intr_remapping_enabled)
goto no_ir;
@ -3825,11 +3825,17 @@ int __init arch_probe_nr_irqs(void)
{
int nr;
nr = ((8 * nr_cpu_ids) > (32 * nr_ioapics) ?
(NR_VECTORS + (8 * nr_cpu_ids)) :
(NR_VECTORS + (32 * nr_ioapics)));
if (nr_irqs > (NR_VECTORS * nr_cpu_ids))
nr_irqs = NR_VECTORS * nr_cpu_ids;
if (nr < nr_irqs && nr > nr_irqs_gsi)
nr = nr_irqs_gsi + 8 * nr_cpu_ids;
#if defined(CONFIG_PCI_MSI) || defined(CONFIG_HT_IRQ)
/*
* for MSI and HT dyn irq
*/
nr += nr_irqs_gsi * 16;
#endif
if (nr < nr_irqs)
nr_irqs = nr;
return 0;