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: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/include/asm/mpspec.h b/arch/x86/include/asm/mpspec.h
index 62d14ce..bd22f2a 100644 (file)
--- a/arch/x86/include/asm/mpspec.h
+++ b/arch/x86/include/asm/mpspec.h
@@ -60,6 +60,7 @@ 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);
@@ -71,6 +72,11 @@ 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)

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index d37593c..7678f10 100644 (file)
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -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)
 {

diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c
index 9b0c480..bc7ac4d 100644 (file)
--- a/arch/x86/kernel/io_apic.c
+++ b/arch/x86/kernel/io_apic.c
@@ -3841,14 +3841,24 @@ int __init io_apic_get_redir_entries (int ioapic)
 
 void __init probe_nr_irqs_gsi(void)
 {
-       int idx;
        int nr = 0;
 
-       for (idx = 0; idx < nr_ioapics; idx++)
-               nr += io_apic_get_redir_entries(idx) + 1;
-
-       if (nr > nr_irqs_gsi)
+       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;
+
+               if (nr > nr_irqs_gsi)
+                       nr_irqs_gsi = nr;
+       }
+
+       printk(KERN_DEBUG "nr_irqs_gsi: %d\n", nr_irqs_gsi);
 }
 
 /* --------------------------------------------------------------------------