Commit cc6c5006 authored by Yinghai Lu's avatar Yinghai Lu Committed by Ingo Molnar
Browse files

x86: find nr_irqs_gsi with mp_ioapic_routing 



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: default avatarYinghai Lu <yinghai@kernel.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent f72dccac

arch/x86/include/asm/mpspec.h

+6 −0
Original line number Diff line number Diff line
@@ -73,6 +73,7 @@ extern void mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, 
				   u32 gsi);

extern void mp_config_acpi_legacy_irqs(void);

extern int mp_register_gsi(u32 gsi, int edge_level, int active_high_low);

extern int acpi_probe_gsi(void);

#ifdef CONFIG_X86_IO_APIC

extern int mp_config_acpi_gsi(unsigned char number, unsigned int devfn, u8 pin,

				u32 gsi, int triggering, int polarity);
@@ -84,6 +85,11 @@ mp_config_acpi_gsi(unsigned char number, unsigned int devfn, u8 pin, 
	return 0;

}

#endif

#else /* !CONFIG_ACPI: */

static inline int acpi_probe_gsi(void)

{

	return 0;

}

#endif /* CONFIG_ACPI */



#define PHYSID_ARRAY_SIZE	BITS_TO_LONGS(MAX_APICS)

arch/x86/kernel/acpi/boot.c

+23 −0
Original line number Diff line number Diff line
@@ -961,6 +961,29 @@ 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 mpc_intsrc *m,

				    struct mpc_intsrc *mp_irq)

{

arch/x86/kernel/io_apic.c

+15 −5
Original line number Diff line number Diff line
@@ -3824,9 +3824,16 @@ int __init io_apic_get_redir_entries (int ioapic) 


void __init probe_nr_irqs_gsi(void)

{

	int idx;

	int nr = 0;



	nr = acpi_probe_gsi();

	if (nr > nr_irqs_gsi) {

		nr_irqs_gsi = nr;

	} else {

		/* for acpi=off or acpi is not compiled in */

		int idx;



		nr = 0;

		for (idx = 0; idx < nr_ioapics; idx++)

			nr += io_apic_get_redir_entries(idx) + 1;
@@ -3834,6 +3841,9 @@ void __init probe_nr_irqs_gsi(void) 
			nr_irqs_gsi = nr;

	}



	printk(KERN_DEBUG "nr_irqs_gsi: %d\n", nr_irqs_gsi);

}



#ifdef CONFIG_SPARSE_IRQ

int __init arch_probe_nr_irqs(void)

{

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