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x86: find nr_irqs_gsi with mp_ioapic_routing

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Impact: find right nr_irqs_gsi on some systems.

One test-system has gap between gsi's:

[    0.000000] ACPI: IOAPIC (id[0x04] address[0xfec00000] gsi_base[0])
[    0.000000] IOAPIC[0]: apic_id 4, version 0, address 0xfec00000, GSI 0-23
[    0.000000] ACPI: IOAPIC (id[0x05] address[0xfeafd000] gsi_base[48])
[    0.000000] IOAPIC[1]: apic_id 5, version 0, address 0xfeafd000, GSI 48-54
[    0.000000] ACPI: IOAPIC (id[0x06] address[0xfeafc000] gsi_base[56])
[    0.000000] IOAPIC[2]: apic_id 6, version 0, address 0xfeafc000, GSI 56-62
...
[    0.000000] nr_irqs_gsi: 38

So nr_irqs_gsi is not right. some irq for MSI will overwrite with io_apic.

need to get that with acpi_probe_gsi when acpi io_apic is used

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 e736ad548d
commit 3f4a739c6a
3 changed files with 44 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
arch/x86/kernel/acpi/boot.c
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@ -973,6 +973,29 @@ void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
nr_ioapics++;
}
int __init acpi_probe_gsi(void)
{
int idx;
int gsi;
int max_gsi = 0;
if (acpi_disabled)
return 0;
if (!acpi_ioapic)
return 0;
max_gsi = 0;
for (idx = 0; idx < nr_ioapics; idx++) {
gsi = mp_ioapic_routing[idx].gsi_end;
if (gsi > max_gsi)
max_gsi = gsi;
}
return max_gsi + 1;
}
static void assign_to_mp_irq(struct mp_config_intsrc *m,
struct mp_config_intsrc *mp_irq)
{