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,
-                                      (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
+                                      (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
+                                      intsrc->global_irq);
                 return 0;
         }
 
@@ -448,7 +496,7 @@ void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
 
 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 {
-        *irq = gsi;
+        *irq = gsi_to_irq(gsi);
 
 #ifdef CONFIG_X86_IO_APIC
         if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
@@ -458,6 +506,14 @@ 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 = irq_to_gsi(isa_irq);
+        return 0;
+}
+
 /*
  * success: return IRQ number (>=0)
  * failure: return < 0
@@ -482,7 +538,7 @@ int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
                 plat_gsi = mp_register_gsi(dev, gsi, trigger, polarity);
         }
 #endif
-        irq = plat_gsi;
+        irq = gsi_to_irq(plat_gsi);
 
         return irq;
 }
@@ -867,29 +923,6 @@ static int __init acpi_parse_madt_lapic_entries(void)
 extern int es7000_plat;
 #endif
 
-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_gsi_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)
 {
@@ -947,13 +980,13 @@ void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
         mp_irq.dstirq = pin;    /* INTIN# */
 
         save_mp_irq(&mp_irq);
+
+        isa_irq_to_gsi[bus_irq] = gsi;
 }
 
 void __init mp_config_acpi_legacy_irqs(void)
 {
         int i;
-        int ioapic;
-        unsigned int dstapic;
         struct mpc_intsrc mp_irq;
 
 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
@@ -974,19 +1007,27 @@ void __init mp_config_acpi_legacy_irqs(void)
 #endif
 
         /*
-         * Locate the IOAPIC that manages the ISA IRQs (0-15).
-         */
-        ioapic = mp_find_ioapic(0);
-        if (ioapic < 0)
-                return;
-        dstapic = mp_ioapics[ioapic].apicid;
-
-        /*
          * Use the default configuration for the IRQs 0-15.  Unless
          * overridden by (MADT) interrupt source override entries.
          */
         for (i = 0; i < 16; i++) {
+                int ioapic, pin;
+                unsigned int dstapic;
                 int idx;
+                u32 gsi;
+
+                /* Locate the gsi that irq i maps to. */
+                if (acpi_isa_irq_to_gsi(i, &gsi))
+                        continue;
+
+                /*
+                 * Locate the IOAPIC that manages the ISA IRQ.
+                 */
+                ioapic = mp_find_ioapic(gsi);
+                if (ioapic < 0)
+                        continue;
+                pin = mp_find_ioapic_pin(ioapic, gsi);
+                dstapic = mp_ioapics[ioapic].apicid;
 
                 for (idx = 0; idx < mp_irq_entries; idx++) {
                         struct mpc_intsrc *irq = mp_irqs + idx;
@@ -996,7 +1037,7 @@ void __init mp_config_acpi_legacy_irqs(void)
                                 break;
 
                         /* Do we already have a mapping for this IOAPIC pin */
-                        if (irq->dstapic == dstapic && irq->dstirq == i)
+                        if (irq->dstapic == dstapic && irq->dstirq == pin)
                                 break;
                 }
 
@@ -1011,7 +1052,7 @@ void __init mp_config_acpi_legacy_irqs(void)
                 mp_irq.dstapic = dstapic;
                 mp_irq.irqtype = mp_INT;
                 mp_irq.srcbusirq = i; /* Identity mapped */
-                mp_irq.dstirq = i;
+                mp_irq.dstirq = pin;
 
                 save_mp_irq(&mp_irq);
         }
@@ -1076,11 +1117,6 @@ int mp_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
 
         ioapic_pin = mp_find_ioapic_pin(ioapic, gsi);
 
-#ifdef CONFIG_X86_32
-        if (ioapic_renumber_irq)
-                gsi = ioapic_renumber_irq(ioapic, gsi);
-#endif
-
         if (ioapic_pin > MP_MAX_IOAPIC_PIN) {
                 printk(KERN_ERR "Invalid reference to IOAPIC pin "
                        "%d-%d\n", mp_ioapics[ioapic].apicid,
@@ -1094,7 +1130,7 @@ int mp_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
         set_io_apic_irq_attr(&irq_attr, ioapic, ioapic_pin,
                              trigger == ACPI_EDGE_SENSITIVE ? 0 : 1,
                              polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
-        io_apic_set_pci_routing(dev, gsi, &irq_attr);
+        io_apic_set_pci_routing(dev, gsi_to_irq(gsi), &irq_attr);
 
         return gsi;
 }
@@ -1154,7 +1190,8 @@ static int __init acpi_parse_madt_ioapic_entries(void)
          * pretend we got one so we can set the SCI flags.
          */
         if (!acpi_sci_override_gsi)
-                acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0);
+                acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
+                                      acpi_gbl_FADT.sci_interrupt);
 
         /* Fill in identity legacy mappings where no override */
         mp_config_acpi_legacy_irqs();
diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index 03ba1b895f5e..425e53a87feb 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -131,24 +131,6 @@ int					es7000_plat;
 
 static unsigned int                     base;
 
-static int
-es7000_rename_gsi(int ioapic, int gsi)
-{
-        if (es7000_plat == ES7000_ZORRO)
-                return gsi;
-
-        if (!base) {
-                int i;
-                for (i = 0; i < nr_ioapics; i++)
-                        base += nr_ioapic_registers[i];
-        }
-
-        if (!ioapic && (gsi < 16))
-                gsi += base;
-
-        return gsi;
-}
-
 static int __cpuinit wakeup_secondary_cpu_via_mip(int cpu, unsigned long eip)
 {
         unsigned long vect = 0, psaival = 0;
@@ -190,7 +172,6 @@ static void setup_unisys(void)
                 es7000_plat = ES7000_ZORRO;
         else
                 es7000_plat = ES7000_CLASSIC;
-        ioapic_renumber_irq = es7000_rename_gsi;
 }
 
 /*
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index eb2789c3f721..33f3563a2a52 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -89,6 +89,9 @@ int nr_ioapics;
 /* IO APIC gsi routing info */
 struct mp_ioapic_gsi  mp_gsi_routing[MAX_IO_APICS];
 
+/* The last gsi number used */
+u32 gsi_end;
+
 /* MP IRQ source entries */
 struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
 
@@ -1013,10 +1016,9 @@ static inline int irq_trigger(int idx)
         return MPBIOS_trigger(idx);
 }
 
-int (*ioapic_renumber_irq)(int ioapic, int irq);
 static int pin_2_irq(int idx, int apic, int pin)
 {
-        int irq, i;
+        int irq;
         int bus = mp_irqs[idx].srcbus;
 
         /*
@@ -1028,18 +1030,12 @@ static int pin_2_irq(int idx, int apic, int pin)
         if (test_bit(bus, mp_bus_not_pci)) {
                 irq = mp_irqs[idx].srcbusirq;
         } else {
-                /*
-                 * PCI IRQs are mapped in order
-                 */
-                i = irq = 0;
-                while (i < apic)
-                        irq += nr_ioapic_registers[i++];
-                irq += pin;
-                /*
-                 * For MPS mode, so far only needed by ES7000 platform
-                 */
-                if (ioapic_renumber_irq)
-                        irq = ioapic_renumber_irq(apic, irq);
+                u32 gsi = mp_gsi_routing[apic].gsi_base + pin;
+
+                if (gsi >= NR_IRQS_LEGACY)
+                        irq = gsi;
+                else
+                        irq = gsi_end + 1 + gsi;
         }
 
 #ifdef CONFIG_X86_32
@@ -1950,20 +1946,8 @@ static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
 
 void __init enable_IO_APIC(void)
 {
-        union IO_APIC_reg_01 reg_01;
         int i8259_apic, i8259_pin;
         int apic;
-        unsigned long flags;
-
-        /*
-         * The number of IO-APIC IRQ registers (== #pins):
-         */
-        for (apic = 0; apic < nr_ioapics; apic++) {
-                raw_spin_lock_irqsave(&ioapic_lock, flags);
-                reg_01.raw = io_apic_read(apic, 1);
-                raw_spin_unlock_irqrestore(&ioapic_lock, flags);
-                nr_ioapic_registers[apic] = reg_01.bits.entries+1;
-        }
 
         if (!legacy_pic->nr_legacy_irqs)
                 return;
@@ -3858,27 +3842,20 @@ int __init io_apic_get_redir_entries (int ioapic)
         reg_01.raw = io_apic_read(ioapic, 1);
         raw_spin_unlock_irqrestore(&ioapic_lock, flags);
 
-        return reg_01.bits.entries;
+        /* The register returns the maximum index redir index
+         * supported, which is one less than the total number of redir
+         * entries.
+         */
+        return reg_01.bits.entries + 1;
 }
 
 void __init probe_nr_irqs_gsi(void)
 {
-        int nr = 0;
+        int nr;
 
-        nr = acpi_probe_gsi();
-        if (nr > nr_irqs_gsi) {
+        nr = gsi_end + 1 + NR_IRQS_LEGACY;
+        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);
 }
@@ -4085,22 +4062,27 @@ int __init io_apic_get_version(int ioapic)
         return reg_01.bits.version;
 }
 
-int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity)
+int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity)
 {
-        int i;
+        int ioapic, pin, idx;
 
         if (skip_ioapic_setup)
                 return -1;
 
-        for (i = 0; i < mp_irq_entries; i++)
-                if (mp_irqs[i].irqtype == mp_INT &&
-                    mp_irqs[i].srcbusirq == bus_irq)
-                        break;
-        if (i >= mp_irq_entries)
+        ioapic = mp_find_ioapic(gsi);
+        if (ioapic < 0)
                 return -1;
 
-        *trigger = irq_trigger(i);
-        *polarity = irq_polarity(i);
+        pin = mp_find_ioapic_pin(ioapic, gsi);
+        if (pin < 0)
+                return -1;
+
+        idx = find_irq_entry(ioapic, pin, mp_INT);
+        if (idx < 0)
+                return -1;
+
+        *trigger = irq_trigger(idx);
+        *polarity = irq_polarity(idx);
         return 0;
 }
 
@@ -4241,7 +4223,7 @@ void __init ioapic_insert_resources(void)
         }
 }
 
-int mp_find_ioapic(int gsi)
+int mp_find_ioapic(u32 gsi)
 {
         int i = 0;
 
@@ -4256,7 +4238,7 @@ int mp_find_ioapic(int gsi)
         return -1;
 }
 
-int mp_find_ioapic_pin(int ioapic, int gsi)
+int mp_find_ioapic_pin(int ioapic, u32 gsi)
 {
         if (WARN_ON(ioapic == -1))
                 return -1;
@@ -4284,6 +4266,7 @@ static int bad_ioapic(unsigned long address)
 void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
 {
         int idx = 0;
+        int entries;
 
         if (bad_ioapic(address))
                 return;
@@ -4302,9 +4285,17 @@ void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
          * Build basic GSI lookup table to facilitate gsi->io_apic lookups
          * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
          */
+        entries = io_apic_get_redir_entries(idx);
         mp_gsi_routing[idx].gsi_base = gsi_base;
-        mp_gsi_routing[idx].gsi_end = gsi_base +
-            io_apic_get_redir_entries(idx);
+        mp_gsi_routing[idx].gsi_end = gsi_base + entries - 1;
+
+        /*
+         * The number of IO-APIC IRQ registers (== #pins):
+         */
+        nr_ioapic_registers[idx] = entries;
+
+        if (mp_gsi_routing[idx].gsi_end > gsi_end)
+                gsi_end = mp_gsi_routing[idx].gsi_end;
 
         printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
                "GSI %d-%d\n", idx, mp_ioapics[idx].apicid,
diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index e81030f71a8f..5ae5d2426edf 100644
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -115,21 +115,6 @@ static void __init MP_bus_info(struct mpc_bus *m)
                 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
 }
 
-static int bad_ioapic(unsigned long address)
-{
-        if (nr_ioapics >= MAX_IO_APICS) {
-                printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
-                       "(found %d)\n", MAX_IO_APICS, nr_ioapics);
-                panic("Recompile kernel with bigger MAX_IO_APICS!\n");
-        }
-        if (!address) {
-                printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
-                       " found in table, skipping!\n");
-                return 1;
-        }
-        return 0;
-}
-
 static void __init MP_ioapic_info(struct mpc_ioapic *m)
 {
         if (!(m->flags & MPC_APIC_USABLE))
@@ -138,15 +123,7 @@ static void __init MP_ioapic_info(struct mpc_ioapic *m)
         printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
                m->apicid, m->apicver, m->apicaddr);
 
-        if (bad_ioapic(m->apicaddr))
-                return;
-
-        mp_ioapics[nr_ioapics].apicaddr = m->apicaddr;
-        mp_ioapics[nr_ioapics].apicid = m->apicid;
-        mp_ioapics[nr_ioapics].type = m->type;
-        mp_ioapics[nr_ioapics].apicver = m->apicver;
-        mp_ioapics[nr_ioapics].flags = m->flags;
-        nr_ioapics++;
+        mp_register_ioapic(m->apicid, m->apicaddr, gsi_end + 1);
 }
 
 static void print_MP_intsrc_info(struct mpc_intsrc *m)
diff --git a/arch/x86/kernel/sfi.c b/arch/x86/kernel/sfi.c
index 34e099382651..7ded57896c0a 100644
--- a/arch/x86/kernel/sfi.c
+++ b/arch/x86/kernel/sfi.c
@@ -81,7 +81,6 @@ static int __init sfi_parse_cpus(struct sfi_table_header *table)
 #endif /* CONFIG_X86_LOCAL_APIC */
 
 #ifdef CONFIG_X86_IO_APIC
-static u32 gsi_base;
 
 static int __init sfi_parse_ioapic(struct sfi_table_header *table)
 {
@@ -94,8 +93,7 @@ static int __init sfi_parse_ioapic(struct sfi_table_header *table)
         pentry = (struct sfi_apic_table_entry *)sb->pentry;
 
         for (i = 0; i < num; i++) {
-                mp_register_ioapic(i, pentry->phys_addr, gsi_base);
-                gsi_base += io_apic_get_redir_entries(i);
+                mp_register_ioapic(i, pentry->phys_addr, gsi_end + 1);
                 pentry++;
         }
 
diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
index b0a71ecee682..e4804fb05e23 100644
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -401,11 +401,13 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
          * driver reported one, then use it. Exit in any case.
          */
         if (gsi < 0) {
+                u32 dev_gsi;
                 dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
                 /* Interrupt Line values above 0xF are forbidden */
-                if (dev->irq > 0 && (dev->irq <= 0xF)) {
-                        printk(" - using IRQ %d\n", dev->irq);
-                        acpi_register_gsi(&dev->dev, dev->irq,
+                if (dev->irq > 0 && (dev->irq <= 0xF) &&
+                    (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) {
+                        printk(" - using ISA IRQ %d\n", dev->irq);
+                        acpi_register_gsi(&dev->dev, dev_gsi,
                                           ACPI_LEVEL_SENSITIVE,
                                           ACPI_ACTIVE_LOW);
                         return 0;
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index b926afe8c03e..3da73f5f0ae9 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -116,11 +116,12 @@ extern unsigned long acpi_realmode_flags;
 
 int acpi_register_gsi (struct device *dev, u32 gsi, int triggering, int polarity);
 int acpi_gsi_to_irq (u32 gsi, unsigned int *irq);
+int acpi_isa_irq_to_gsi (unsigned isa_irq, u32 *gsi);
 
 #ifdef CONFIG_X86_IO_APIC
-extern int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity);
+extern int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity);
 #else
-#define acpi_get_override_irq(bus, trigger, polarity) (-1)
+#define acpi_get_override_irq(gsi, trigger, polarity) (-1)
 #endif
 /*
  * This function undoes the effect of one call to acpi_register_gsi().