Merge branch 'x86-irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, acpi/irq: Define gsi_end when X86_IO_APIC is undefined
  x86, irq: Kill io_apic_renumber_irq
  x86, acpi/irq: Handle isa irqs that are not identity mapped to gsi's.
  x86, ioapic: Simplify probe_nr_irqs_gsi.
  x86, ioapic: Optimize pin_2_irq
  x86, ioapic: Move nr_ioapic_registers calculation to mp_register_ioapic.
  x86, ioapic: In mpparse use mp_register_ioapic
  x86, ioapic: Teach mp_register_ioapic to compute a global gsi_end
  x86, ioapic: Fix the types of gsi values
  x86, ioapic: Fix io_apic_redir_entries to return the number of entries.
  x86, ioapic: Only export mp_find_ioapic and mp_find_ioapic_pin in io_apic.h
  x86, acpi/irq: Generalize mp_config_acpi_legacy_irqs
  x86, acpi/irq: Fix acpi_sci_ioapic_setup so it has both bus_irq and gsi
  x86, acpi/irq: pci device dev->irq is an isa irq not a gsi
  x86, acpi/irq: Teach acpi_get_override_irq to take a gsi not an isa_irq
  x86, acpi/irq: Introduce apci_isa_irq_to_gsi

10 files changed, 155 insertions, 169 deletions

diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 4d1a7e9314cf..c6c90f39f4d9 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -785,6 +785,14 @@ int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
         return 0;
 }
 
+int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
+{
+        if (isa_irq >= 16)
+                return -1;
+        *gsi = isa_irq;
+        return 0;
+}
+
 /*
  *  ACPI based hotplug CPU support
  */
diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 35832a03a515..63cb4096c3dc 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -159,7 +159,6 @@ struct io_apic_irq_attr;
 extern int io_apic_set_pci_routing(struct device *dev, int irq,
                  struct io_apic_irq_attr *irq_attr);
 void setup_IO_APIC_irq_extra(u32 gsi);
-extern int (*ioapic_renumber_irq)(int ioapic, int irq);
 extern void ioapic_init_mappings(void);
 extern void ioapic_insert_resources(void);
 
@@ -180,12 +179,13 @@ extern void ioapic_write_entry(int apic, int pin,
 extern void setup_ioapic_ids_from_mpc(void);
 
 struct mp_ioapic_gsi{
-        int gsi_base;
-        int gsi_end;
+        u32 gsi_base;
+        u32 gsi_end;
 };
 extern struct mp_ioapic_gsi  mp_gsi_routing[];
-int mp_find_ioapic(int gsi);
-int mp_find_ioapic_pin(int ioapic, int gsi);
+extern u32 gsi_end;
+int mp_find_ioapic(u32 gsi);
+int mp_find_ioapic_pin(int ioapic, u32 gsi);
 void __init mp_register_ioapic(int id, u32 address, u32 gsi_base);
 extern void __init pre_init_apic_IRQ0(void);
 
@@ -197,7 +197,8 @@ static const int timer_through_8259 = 0;
 static inline void ioapic_init_mappings(void)   { }
 static inline void ioapic_insert_resources(void) { }
 static inline void probe_nr_irqs_gsi(void)      { }
-static inline int mp_find_ioapic(int gsi) { return 0; }
+#define gsi_end (NR_IRQS_LEGACY - 1)
+static inline int mp_find_ioapic(u32 gsi) { return 0; }
 
 struct io_apic_irq_attr;
 static inline int io_apic_set_pci_routing(struct device *dev, int irq,
diff --git a/arch/x86/include/asm/mpspec.h b/arch/x86/include/asm/mpspec.h
index d8bf23a88d05..c82868e9f905 100644
--- a/arch/x86/include/asm/mpspec.h
+++ b/arch/x86/include/asm/mpspec.h
@@ -105,16 +105,6 @@ extern void mp_config_acpi_legacy_irqs(void);
 struct device;
 extern int mp_register_gsi(struct device *dev, u32 gsi, int edge_level,
                                  int active_high_low);
-extern int acpi_probe_gsi(void);
-#ifdef CONFIG_X86_IO_APIC
-extern int mp_find_ioapic(int gsi);
-extern int mp_find_ioapic_pin(int ioapic, int gsi);
-#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 cd40aba6aa95..9a5ed58f09dc 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -94,6 +94,53 @@ enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
 
 
 /*
+ * ISA irqs by default are the first 16 gsis but can be
+ * any gsi as specified by an interrupt source override.
+ */
+static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
+        0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
+};
+
+static unsigned int gsi_to_irq(unsigned int gsi)
+{
+        unsigned int irq = gsi + NR_IRQS_LEGACY;
+        unsigned int i;
+
+        for (i = 0; i < NR_IRQS_LEGACY; i++) {
+                if (isa_irq_to_gsi[i] == gsi) {
+                        return i;
+                }
+        }
+
+        /* Provide an identity mapping of gsi == irq
+         * except on truly weird platforms that have
+         * non isa irqs in the first 16 gsis.
+         */
+        if (gsi >= NR_IRQS_LEGACY)
+                irq = gsi;
+        else
+                irq = gsi_end + 1 + gsi;
+
+        return irq;
+}
+
+static u32 irq_to_gsi(int irq)
+{
+        unsigned int gsi;
+
+        if (irq < NR_IRQS_LEGACY)
+                gsi = isa_irq_to_gsi[irq];
+        else if (irq <= gsi_end)
+                gsi = irq;
+        else if (irq <= (gsi_end + NR_IRQS_LEGACY))
+                gsi = irq - gsi_end;
+        else
+                gsi = 0xffffffff;
+
+        return gsi;
+}
+
+/*
  * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
  * to map the target physical address. The problem is that set_fixmap()
  * provides a single page, and it is possible that the page is not
@@ -313,7 +360,7 @@ acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
 /*
  * Parse Interrupt Source Override for the ACPI SCI
  */
-static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
+static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
 {
         if (trigger == 0)       /* compatible SCI trigger is level */
                 trigger = 3;
@@ -333,7 +380,7 @@ static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
          * If GSI is < 16, this will update its flags,
          * else it will create a new mp_irqs[] entry.
          */
-        mp_override_legacy_irq(gsi, polarity, trigger, gsi);
+        mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
 
         /*
          * stash over-ride to indicate we've been here
@@ -357,9 +404,10 @@ acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
         acpi_table_print_madt_entry(header);
 
         if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
-                acpi_sci_ioapic_setup(intsrc->global_irq,
+                acpi_sci_ioapic_setup(intsrc->source_irq,
                                       intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,