1 files changed, 74 insertions, 125 deletions

diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c
index e03bc0f87eef..6f80dc2f137e 100644
--- a/arch/x86/kernel/io_apic.c
+++ b/arch/x86/kernel/io_apic.c
@@ -107,7 +107,6 @@ static int __init parse_noapic(char *str)
 }
 early_param("noapic", parse_noapic);
 
-struct irq_cfg;
 struct irq_pin_list;
 struct irq_cfg {
         unsigned int irq;
@@ -120,7 +119,7 @@ struct irq_cfg {
 };
 
 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
-static struct irq_cfg irq_cfg_legacy[] __initdata = {
+static struct irq_cfg irq_cfgx[NR_IRQS] = {
         [0]  = { .irq =  0, .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR,  },
         [1]  = { .irq =  1, .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR,  },
         [2]  = { .irq =  2, .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR,  },
@@ -139,49 +138,27 @@ static struct irq_cfg irq_cfg_legacy[] __initdata = {
         [15] = { .irq = 15, .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
 };
 
-static struct irq_cfg irq_cfg_init = { .irq =  -1U, };
-
-static void init_one_irq_cfg(struct irq_cfg *cfg)
-{
-        memcpy(cfg, &irq_cfg_init, sizeof(struct irq_cfg));
-}
-
-static struct irq_cfg *irq_cfgx;
-
-static void __init init_work(void *data)
-{
-        struct dyn_array *da = data;
-        struct irq_cfg *cfg;
-        int legacy_count;
-        int i;
-
-        cfg = *da->name;
-
-        memcpy(cfg, irq_cfg_legacy, sizeof(irq_cfg_legacy));
-
-        legacy_count = ARRAY_SIZE(irq_cfg_legacy);
-        for (i = legacy_count; i < *da->nr; i++)
-                init_one_irq_cfg(&cfg[i]);
-}
-
 #define for_each_irq_cfg(irq, cfg)              \
-        for (irq = 0, cfg = &irq_cfgx[irq]; irq < nr_irqs; irq++, cfg = &irq_cfgx[irq])
+        for (irq = 0, cfg = irq_cfgx; irq < nr_irqs; irq++, cfg++)
 
-DEFINE_DYN_ARRAY(irq_cfgx, sizeof(struct irq_cfg), nr_irqs, PAGE_SIZE, init_work);
-
-struct irq_cfg *irq_cfg(unsigned int irq)
+static struct irq_cfg *irq_cfg(unsigned int irq)
 {
-        if (irq < nr_irqs)
-                return &irq_cfgx[irq];
-
-        return NULL;
+        return irq < nr_irqs ? irq_cfgx + irq : NULL;
 }
-struct irq_cfg *irq_cfg_alloc(unsigned int irq)
+
+static struct irq_cfg *irq_cfg_alloc(unsigned int irq)
 {
         return irq_cfg(irq);
 }
 
 /*
+ * Rough estimation of how many shared IRQs there are, can be changed
+ * anytime.
+ */
+#define MAX_PLUS_SHARED_IRQS NR_IRQS
+#define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
+
+/*
  * This is performance-critical, we want to do it O(1)
  *
  * the indexing order of this array favors 1:1 mappings
@@ -193,59 +170,29 @@ struct irq_pin_list {
         struct irq_pin_list *next;
 };
 
-static struct irq_pin_list *irq_2_pin_head;
-/* fill one page ? */
-static int nr_irq_2_pin = 0x100;
+static struct irq_pin_list irq_2_pin_head[PIN_MAP_SIZE];
 static struct irq_pin_list *irq_2_pin_ptr;
-static void __init irq_2_pin_init_work(void *data)
+
+static void __init irq_2_pin_init(void)
 {
-        struct dyn_array *da = data;
-        struct irq_pin_list *pin;
+        struct irq_pin_list *pin = irq_2_pin_head;
         int i;
 
-        pin = *da->name;
-
-        for (i = 1; i < *da->nr; i++)
+        for (i = 1; i < PIN_MAP_SIZE; i++)
                 pin[i-1].next = &pin[i];
 
         irq_2_pin_ptr = &pin[0];
 }
-DEFINE_DYN_ARRAY(irq_2_pin_head, sizeof(struct irq_pin_list), nr_irq_2_pin, PAGE_SIZE, irq_2_pin_init_work);
 
 static struct irq_pin_list *get_one_free_irq_2_pin(void)
 {
-        struct irq_pin_list *pin;
-        int i;
-
-        pin = irq_2_pin_ptr;
-
-        if (pin) {
-                irq_2_pin_ptr = pin->next;
-                pin->next = NULL;
-                return pin;
-        }
-
-        /*
-         *  we run out of pre-allocate ones, allocate more
-         */
-        printk(KERN_DEBUG "try to get more irq_2_pin %d\n", nr_irq_2_pin);
-
-        if (after_bootmem)
-                pin = kzalloc(sizeof(struct irq_pin_list)*nr_irq_2_pin,
-                                 GFP_ATOMIC);
-        else
-                pin = __alloc_bootmem_nopanic(sizeof(struct irq_pin_list) *
-                                nr_irq_2_pin, PAGE_SIZE, 0);
+        struct irq_pin_list *pin = irq_2_pin_ptr;
 
         if (!pin)
                 panic("can not get more irq_2_pin\n");
 
-        for (i = 1; i < nr_irq_2_pin; i++)
-                pin[i-1].next = &pin[i];
-
         irq_2_pin_ptr = pin->next;
         pin->next = NULL;
-
         return pin;
 }
 
@@ -284,8 +231,9 @@ static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned i
 static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
 {
         struct io_apic __iomem *io_apic = io_apic_base(apic);
-        if (sis_apic_bug)
-                writel(reg, &io_apic->index);
+
+        if (sis_apic_bug)
+                writel(reg, &io_apic->index);
         writel(value, &io_apic->data);
 }
 
@@ -1044,11 +992,11 @@ static int pin_2_irq(int idx, int apic, int pin)
                 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);
+                if (ioapic_renumber_irq)
+                        irq = ioapic_renumber_irq(apic, irq);
         }
 
 #ifdef CONFIG_X86_32
@@ -1232,19 +1180,19 @@ static struct irq_chip ir_ioapic_chip;
 #ifdef CONFIG_X86_32
 static inline int IO_APIC_irq_trigger(int irq)
 {
-        int apic, idx, pin;
+        int apic, idx, pin;
 
-        for (apic = 0; apic < nr_ioapics; apic++) {
-                for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
-                        idx = find_irq_entry(apic, pin, mp_INT);
-                        if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin)))
-                                return irq_trigger(idx);
-                }
-        }
-        /*
+        for (apic = 0; apic < nr_ioapics; apic++) {
+                for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
+                        idx = find_irq_entry(apic, pin, mp_INT);
+                        if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin)))
+                                return irq_trigger(idx);
+                }
+        }
+        /*
          * nonexistent IRQs are edge default
          */
-        return 0;
+        return 0;
 }
 #else
 static inline int IO_APIC_irq_trigger(int irq)
@@ -1509,8 +1457,8 @@ __apicdebuginit(void) print_IO_APIC(void)
         reg_01.raw = io_apic_read(apic, 1);
         if (reg_01.bits.version >= 0x10)
                 reg_02.raw = io_apic_read(apic, 2);
-        if (reg_01.bits.version >= 0x20)
-                reg_03.raw = io_apic_read(apic, 3);
+        if (reg_01.bits.version >= 0x20)
+                reg_03.raw = io_apic_read(apic, 3);
         spin_unlock_irqrestore(&ioapic_lock, flags);
 
         printk("\n");
@@ -2089,9 +2037,9 @@ static int ioapic_retrigger_irq(unsigned int irq)
 #else
 static int ioapic_retrigger_irq(unsigned int irq)
 {
-        send_IPI_self(irq_cfg(irq)->vector);
+        send_IPI_self(irq_cfg(irq)->vector);
 
-        return 1;
+        return 1;
 }
 #endif
 
@@ -2189,7 +2137,7 @@ static int migrate_irq_remapped_level(int irq)
 
         if (io_apic_level_ack_pending(irq)) {
                 /*
-                 * Interrupt in progress. Migrating irq now will change the
+                 * Interrupt in progress. Migrating irq now will change the
                  * vector information in the IO-APIC RTE and that will confuse
                  * the EOI broadcast performed by cpu.
                  * So, delay the irq migration to the next instance.
@@ -2426,28 +2374,28 @@ static void ack_apic_level(unsigned int irq)
 }
 
 static struct irq_chip ioapic_chip __read_mostly = {
-        .name           = "IO-APIC",
-        .startup        = startup_ioapic_irq,
-        .mask           = mask_IO_APIC_irq,
-        .unmask         = unmask_IO_APIC_irq,
-        .ack            = ack_apic_edge,
-        .eoi            = ack_apic_level,
+        .name           = "IO-APIC",
+        .startup        = startup_ioapic_irq,
+        .mask           = mask_IO_APIC_irq,
+        .unmask         = unmask_IO_APIC_irq,
+        .ack            = ack_apic_edge,
+        .eoi            = ack_apic_level,
 #ifdef CONFIG_SMP
-        .set_affinity   = set_ioapic_affinity_irq,
+        .set_affinity   = set_ioapic_affinity_irq,
 #endif
         .retrigger      = ioapic_retrigger_irq,
 };
 
 #ifdef CONFIG_INTR_REMAP
 static struct irq_chip ir_ioapic_chip __read_mostly = {
-        .name           = "IR-IO-APIC",
-        .startup        = startup_ioapic_irq,
-        .mask           = mask_IO_APIC_irq,
-        .unmask         = unmask_IO_APIC_irq,
-        .ack            = ack_x2apic_edge,
-        .eoi            = ack_x2apic_level,
+        .name           = "IR-IO-APIC",
+        .startup        = startup_ioapic_irq,
+        .mask           = mask_IO_APIC_irq,
+        .unmask         = unmask_IO_APIC_irq,
+        .ack            = ack_x2apic_edge,
+        .eoi            = ack_x2apic_level,
 #ifdef CONFIG_SMP
-        .set_affinity   = set_ir_ioapic_affinity_irq,
+        .set_affinity   = set_ir_ioapic_affinity_irq,
 #endif
         .retrigger      = ioapic_retrigger_irq,
 };
@@ -2636,8 +2584,8 @@ static inline void __init check_timer(void)
 
         local_irq_save(flags);
 
-        ver = apic_read(APIC_LVR);
-        ver = GET_APIC_VERSION(ver);
+        ver = apic_read(APIC_LVR);
+        ver = GET_APIC_VERSION(ver);
 
         /*
          * get/set the timer IRQ vector:
@@ -2822,12 +2770,12 @@ void __init setup_IO_APIC(void)
         io_apic_irqs = ~PIC_IRQS;
 
         apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
-        /*
+        /*
          * Set up IO-APIC IRQ routing.
          */
 #ifdef CONFIG_X86_32
-        if (!acpi_ioapic)
-                setup_ioapic_ids_from_mpc();
+        if (!acpi_ioapic)
+                setup_ioapic_ids_from_mpc();
 #endif
         sync_Arb_IDs();
         setup_IO_APIC_irqs();
@@ -2842,9 +2790,9 @@ void __init setup_IO_APIC(void)
 
 static int __init io_apic_bug_finalize(void)
 {
-        if (sis_apic_bug == -1)
-                sis_apic_bug = 0;
-        return 0;
+        if (sis_apic_bug == -1)
+                sis_apic_bug = 0;
+        return 0;
 }
 
 late_initcall(io_apic_bug_finalize);
@@ -3199,7 +3147,7 @@ static int msi_alloc_irte(struct pci_dev *dev, int irq, int nvec)
         if (index < 0) {
                 printk(KERN_ERR
                        "Unable to allocate %d IRTE for PCI %s\n", nvec,
-                        pci_name(dev));
+                       pci_name(dev));
                 return -ENOSPC;
         }
         return index;
@@ -3885,23 +3833,24 @@ static struct resource * __init ioapic_setup_resources(void)
 void __init ioapic_init_mappings(void)
 {
         unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
-        int i;
         struct resource *ioapic_res;
+        int i;
 
+        irq_2_pin_init();
         ioapic_res = ioapic_setup_resources();
         for (i = 0; i < nr_ioapics; i++) {
                 if (smp_found_config) {
                         ioapic_phys = mp_ioapics[i].mp_apicaddr;
 #ifdef CONFIG_X86_32
-                        if (!ioapic_phys) {
-                                printk(KERN_ERR
-                                       "WARNING: bogus zero IO-APIC "
-                                       "address found in MPTABLE, "
-                                       "disabling IO/APIC support!\n");
-                                smp_found_config = 0;
-                                skip_ioapic_setup = 1;
-                                goto fake_ioapic_page;
-                        }
+                        if (!ioapic_phys) {
+                                printk(KERN_ERR
+                                       "WARNING: bogus zero IO-APIC "
+                                       "address found in MPTABLE, "
+                                       "disabling IO/APIC support!\n");
+                                smp_found_config = 0;
+                                skip_ioapic_setup = 1;
+                                goto fake_ioapic_page;
+                        }
 #endif
                 } else {
 #ifdef CONFIG_X86_32