x86: make 32 bit to use sparse_irq

but actually irq still needs to be less than NR_IRQS, because
interrupt[NR_IRQS] in entry.S.

need to enable per_cpu vector...

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 43 insertions, 20 deletions

diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c
index 59d2e8a273e3..66c0a91362a7 100644
--- a/arch/x86/kernel/io_apic_32.c
+++ b/arch/x86/kernel/io_apic_32.c
@@ -595,7 +595,6 @@ static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
         struct irq_pin_list *entry;
         unsigned int apicid_value;
         cpumask_t tmp;
-        struct irq_desc *desc;
 
 
         cfg = irq_cfg(irq);
@@ -620,8 +619,7 @@ static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
                         break;
                 entry = entry->next;
         }
-        desc = irq_to_desc(irq);
-        desc->affinity = cpumask;
+        irq_to_desc(irq)->affinity = cpumask;
         spin_unlock_irqrestore(&ioapic_lock, flags);
 }
 
@@ -1055,8 +1053,6 @@ static int __assign_irq_vector(int irq)
         int vector, offset;
         struct irq_cfg *cfg;
 
-        BUG_ON((unsigned)irq >= nr_irqs);
-
         cfg = irq_cfg(irq);
         if (cfg->vector > 0)
                 return cfg->vector;
@@ -1103,7 +1099,12 @@ static void ioapic_register_intr(int irq, int vector, unsigned long trigger)
 {
         struct irq_desc *desc;
 
-        desc = irq_to_desc(irq);
+        /* first time to use this irq_desc */
+        if (irq < 16)
+                desc = irq_to_desc(irq);
+        else
+                desc = irq_to_desc_alloc(irq);
+
         if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
             trigger == IOAPIC_LEVEL) {
                 desc->status |= IRQ_LEVEL;
@@ -2330,16 +2331,19 @@ device_initcall(ioapic_init_sysfs);
 /*
  * Dynamic irq allocate and deallocation
  */
-int create_irq(void)
+unsigned int create_irq_nr(unsigned int irq_want)
 {
         /* Allocate an unused irq */
-        int irq, new, vector = 0;
+        unsigned int irq, new, vector = 0;
         unsigned long flags;
         struct irq_cfg *cfg_new;
 
-        irq = -ENOSPC;
+        /* only can use bus/dev/fn.. when per_cpu vector is used */
+        irq_want = nr_irqs - 1;
+
+        irq = 0;
         spin_lock_irqsave(&vector_lock, flags);
-        for (new = (nr_irqs - 1); new >= 0; new--) {
+        for (new = (nr_irqs - 1); new > 0; new--) {
                 if (platform_legacy_irq(new))
                         continue;
                 cfg_new = irq_cfg(new);
@@ -2354,13 +2358,18 @@ int create_irq(void)
         }
         spin_unlock_irqrestore(&vector_lock, flags);
 
-        if (irq >= 0) {
+        if (irq > 0) {
                 set_intr_gate(vector, interrupt[irq]);
                 dynamic_irq_init(irq);
         }
         return irq;
 }
 
+int create_irq(void)
+{
+        return create_irq_nr(nr_irqs - 1);
+}
+
 void destroy_irq(unsigned int irq)
 {
         unsigned long flags;
@@ -2415,7 +2424,6 @@ static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
         unsigned int dest;
         cpumask_t tmp;
         int vector;
-        struct irq_desc *desc;
 
         cpus_and(tmp, mask, cpu_online_map);
         if (cpus_empty(tmp))
@@ -2435,8 +2443,7 @@ static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
         msg.address_lo |= MSI_ADDR_DEST_ID(dest);
 
         write_msi_msg(irq, &msg);
-        desc = irq_to_desc(irq);
-        desc->affinity = mask;
+        irq_to_desc(irq)->affinity = mask;
 }
 #endif /* CONFIG_SMP */
 
@@ -2455,13 +2462,31 @@ static struct irq_chip msi_chip = {
         .retrigger      = ioapic_retrigger_irq,
 };
 
+static unsigned int build_irq_for_pci_dev(struct pci_dev *dev)
+{
+        unsigned int irq;
+
+        irq = dev->bus->number;
+        irq <<= 8;
+        irq |= dev->devfn;
+        irq <<= 12;
+
+        return irq;
+}
+
 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
 {
         struct msi_msg msg;
         int irq, ret;
-        irq = create_irq();
-        if (irq < 0)
-                return irq;
+
+        unsigned int irq_want;
+
+        irq_want = build_irq_for_pci_dev(dev) + 0x100;
+
+        irq = create_irq_nr(irq_want);
+
+        if (irq == 0)
+                return -1;
 
         ret = msi_compose_msg(dev, irq, &msg);
         if (ret < 0) {
@@ -2510,7 +2535,6 @@ static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
 {
         unsigned int dest;
         cpumask_t tmp;
-        struct irq_desc *desc;
 
         cpus_and(tmp, mask, cpu_online_map);
         if (cpus_empty(tmp))
@@ -2521,8 +2545,7 @@ static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
         dest = cpu_mask_to_apicid(mask);
 
         target_ht_irq(irq, dest);
-        desc = irq_to_desc(irq);
-        desc->affinity = mask;
+        irq_to_desc(irq)->affinity = mask;
 }
 #endif