3 files changed, 115 insertions, 48 deletions

diff --git a/arch/x86_64/kernel/genapic_cluster.c b/arch/x86_64/kernel/genapic_cluster.c
index cdb90e671b88..73d76308b955 100644
--- a/arch/x86_64/kernel/genapic_cluster.c
+++ b/arch/x86_64/kernel/genapic_cluster.c
@@ -63,6 +63,13 @@ static cpumask_t cluster_target_cpus(void)
         return cpumask_of_cpu(0);
 }
 
+static cpumask_t cluster_vector_allocation_domain(int cpu)
+{
+        cpumask_t domain = CPU_MASK_NONE;
+        cpu_set(cpu, domain);
+        return domain;
+}
+
 static void cluster_send_IPI_mask(cpumask_t mask, int vector)
 {
         send_IPI_mask_sequence(mask, vector);
@@ -119,6 +126,7 @@ struct genapic apic_cluster = {
         .int_delivery_mode = dest_Fixed,
         .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
         .target_cpus = cluster_target_cpus,
+        .vector_allocation_domain = cluster_vector_allocation_domain,
         .apic_id_registered = cluster_apic_id_registered,
         .init_apic_ldr = cluster_init_apic_ldr,
         .send_IPI_all = cluster_send_IPI_all,
diff --git a/arch/x86_64/kernel/genapic_flat.c b/arch/x86_64/kernel/genapic_flat.c
index 50ad153eaac4..0dfc223c1839 100644
--- a/arch/x86_64/kernel/genapic_flat.c
+++ b/arch/x86_64/kernel/genapic_flat.c
@@ -22,6 +22,20 @@ static cpumask_t flat_target_cpus(void)
         return cpu_online_map;
 }
 
+static cpumask_t flat_vector_allocation_domain(int cpu)
+{
+        /* Careful. Some cpus do not strictly honor the set of cpus
+         * specified in the interrupt destination when using lowest
+         * priority interrupt delivery mode.
+         *
+         * In particular there was a hyperthreading cpu observed to
+         * deliver interrupts to the wrong hyperthread when only one
+         * hyperthread was specified in the interrupt desitination.
+         */
+        cpumask_t domain = { { [0] = APIC_ALL_CPUS, } };
+        return domain;
+}
+
 /*
  * Set up the logical destination ID.
  *
@@ -121,6 +135,7 @@ struct genapic apic_flat =  {
         .int_delivery_mode = dest_LowestPrio,
         .int_dest_mode = (APIC_DEST_LOGICAL != 0),
         .target_cpus = flat_target_cpus,
+        .vector_allocation_domain = flat_vector_allocation_domain,
         .apic_id_registered = flat_apic_id_registered,
         .init_apic_ldr = flat_init_apic_ldr,
         .send_IPI_all = flat_send_IPI_all,
@@ -141,6 +156,14 @@ static cpumask_t physflat_target_cpus(void)
         return cpumask_of_cpu(0);
 }
 
+static cpumask_t physflat_vector_allocation_domain(int cpu)
+{
+        cpumask_t domain = CPU_MASK_NONE;
+        cpu_set(cpu, domain);
+        return domain;
+}
+
+
 static void physflat_send_IPI_mask(cpumask_t cpumask, int vector)
 {
         send_IPI_mask_sequence(cpumask, vector);
@@ -179,6 +202,7 @@ struct genapic apic_physflat =  {
         .int_delivery_mode = dest_Fixed,
         .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
         .target_cpus = physflat_target_cpus,
+        .vector_allocation_domain = physflat_vector_allocation_domain,
         .apic_id_registered = flat_apic_id_registered,
         .init_apic_ldr = flat_init_apic_ldr,/*not needed, but shouldn't hurt*/
         .send_IPI_all = physflat_send_IPI_all,
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index 9c3b9b19d699..771bcf77daf2 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -47,7 +47,7 @@
 #include <asm/msidef.h>
 #include <asm/hypertransport.h>
 
-static int assign_irq_vector(int irq, cpumask_t mask);
+static int assign_irq_vector(int irq, cpumask_t mask, cpumask_t *result);
 
 #define __apicdebuginit  __init
 
@@ -174,12 +174,10 @@ static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
 
         cpus_and(mask, tmp, CPU_MASK_ALL);
 
-        vector = assign_irq_vector(irq, mask);
+        vector = assign_irq_vector(irq, mask, &tmp);
         if (vector < 0)
                 return;
 
-        cpus_clear(tmp);
-        cpu_set(vector >> 8, tmp);
         dest = cpu_mask_to_apicid(tmp);
 
         /*
@@ -188,7 +186,7 @@ static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
         dest = SET_APIC_LOGICAL_ID(dest);
 
         spin_lock_irqsave(&ioapic_lock, flags);
-        __target_IO_APIC_irq(irq, dest, vector & 0xff);
+        __target_IO_APIC_irq(irq, dest, vector);
         set_native_irq_info(irq, mask);
         spin_unlock_irqrestore(&ioapic_lock, flags);
 }
@@ -563,9 +561,45 @@ static inline int IO_APIC_irq_trigger(int irq)
 }
 
 /* irq_vectors is indexed by the sum of all RTEs in all I/O APICs. */
-unsigned int irq_vector[NR_IRQ_VECTORS] __read_mostly = { FIRST_EXTERNAL_VECTOR, 0 };
+static u8 irq_vector[NR_IRQ_VECTORS] __read_mostly = {
+        [0] = FIRST_EXTERNAL_VECTOR + 0,
+        [1] = FIRST_EXTERNAL_VECTOR + 1,
+        [2] = FIRST_EXTERNAL_VECTOR + 2,
+        [3] = FIRST_EXTERNAL_VECTOR + 3,
+        [4] = FIRST_EXTERNAL_VECTOR + 4,
+        [5] = FIRST_EXTERNAL_VECTOR + 5,
+        [6] = FIRST_EXTERNAL_VECTOR + 6,
+        [7] = FIRST_EXTERNAL_VECTOR + 7,
+        [8] = FIRST_EXTERNAL_VECTOR + 8,
+        [9] = FIRST_EXTERNAL_VECTOR + 9,
+        [10] = FIRST_EXTERNAL_VECTOR + 10,
+        [11] = FIRST_EXTERNAL_VECTOR + 11,
+        [12] = FIRST_EXTERNAL_VECTOR + 12,
+        [13] = FIRST_EXTERNAL_VECTOR + 13,
+        [14] = FIRST_EXTERNAL_VECTOR + 14,
+        [15] = FIRST_EXTERNAL_VECTOR + 15,
+};
+
+static cpumask_t irq_domain[NR_IRQ_VECTORS] __read_mostly = {
+        [0] = CPU_MASK_ALL,
+        [1] = CPU_MASK_ALL,
+        [2] = CPU_MASK_ALL,
+        [3] = CPU_MASK_ALL,
+        [4] = CPU_MASK_ALL,
+        [5] = CPU_MASK_ALL,
+        [6] = CPU_MASK_ALL,
+        [7] = CPU_MASK_ALL,
+        [8] = CPU_MASK_ALL,
+        [9] = CPU_MASK_ALL,
+        [10] = CPU_MASK_ALL,
+        [11] = CPU_MASK_ALL,
+        [12] = CPU_MASK_ALL,
+        [13] = CPU_MASK_ALL,
+        [14] = CPU_MASK_ALL,
+        [15] = CPU_MASK_ALL,
+};
 
-static int __assign_irq_vector(int irq, cpumask_t mask)
+static int __assign_irq_vector(int irq, cpumask_t mask, cpumask_t *result)
 {
         /*
          * NOTE! The local APIC isn't very good at handling
@@ -589,14 +623,22 @@ static int __assign_irq_vector(int irq, cpumask_t mask)
 
         if (irq_vector[irq] > 0)
                 old_vector = irq_vector[irq];
-        if ((old_vector > 0) && cpu_isset(old_vector >> 8, mask)) {
-                return old_vector;
+        if (old_vector > 0) {
+                cpus_and(*result, irq_domain[irq], mask);
+                if (!cpus_empty(*result))
+                        return old_vector;
         }
 
         for_each_cpu_mask(cpu, mask) {
+                cpumask_t domain;
+                int first, new_cpu;
                 int vector, offset;
-                vector = pos[cpu].vector;
-                offset = pos[cpu].offset;
+
+                domain = vector_allocation_domain(cpu);
+                first = first_cpu(domain);
+
+                vector = pos[first].vector;
+                offset = pos[first].offset;
 next:
                 vector += 8;
                 if (vector >= FIRST_SYSTEM_VECTOR) {
@@ -604,35 +646,40 @@ next:
                         offset = (offset + 1) % 8;
                         vector = FIRST_DEVICE_VECTOR + offset;
                 }
-                if (unlikely(pos[cpu].vector == vector))
+                if (unlikely(pos[first].vector == vector))
                         continue;
                 if (vector == IA32_SYSCALL_VECTOR)
                         goto next;
-                if (per_cpu(vector_irq, cpu)[vector] != -1)
-                        goto next;
+                for_each_cpu_mask(new_cpu, domain)
+                        if (per_cpu(vector_irq, cpu)[vector] != -1)
+                                goto next;
                 /* Found one! */
-                pos[cpu].vector = vector;
-                pos[cpu].offset = offset;
+                for_each_cpu_mask(new_cpu, domain) {
+                        pos[cpu].vector = vector;
+                        pos[cpu].offset = offset;
+                }
                 if (old_vector >= 0) {
-                        int old_cpu = old_vector >> 8;
-                        old_vector &= 0xff;
-                        per_cpu(vector_irq, old_cpu)[old_vector] = -1;
+                        int old_cpu;
+                        for_each_cpu_mask(old_cpu, domain)
+                                per_cpu(vector_irq, old_cpu)[old_vector] = -1;
                 }
-                per_cpu(vector_irq, cpu)[vector] = irq;
-                vector |= cpu << 8;
+                for_each_cpu_mask(new_cpu, domain)
+                        per_cpu(vector_irq, new_cpu)[vector] = irq;
                 irq_vector[irq] = vector;
+                irq_domain[irq] = domain;
+                cpus_and(*result, domain, mask);
                 return vector;
         }
         return -ENOSPC;
 }
 
-static int assign_irq_vector(int irq, cpumask_t mask)
+static int assign_irq_vector(int irq, cpumask_t mask, cpumask_t *result)
 {
         int vector;
         unsigned long flags;
 
         spin_lock_irqsave(&vector_lock, flags);
-        vector = __assign_irq_vector(irq, mask);
+        vector = __assign_irq_vector(irq, mask, result);
         spin_unlock_irqrestore(&vector_lock, flags);
         return vector;
 }
@@ -704,14 +751,12 @@ static void __init setup_IO_APIC_irqs(void)
 
                 if (IO_APIC_IRQ(irq)) {
                         cpumask_t mask;
-                        vector = assign_irq_vector(irq, TARGET_CPUS);
+                        vector = assign_irq_vector(irq, TARGET_CPUS, &mask);
                         if (vector < 0)
                                 continue;
 
-                        cpus_clear(mask);
-                        cpu_set(vector >> 8, mask);
                         entry.dest.logical.logical_dest = cpu_mask_to_apicid(mask);
-                        entry.vector = vector & 0xff;
+                        entry.vector = vector;
 
                         ioapic_register_intr(irq, vector, IOAPIC_AUTO);
                         if (!apic && (irq < 16))
@@ -1430,12 +1475,13 @@ static inline void check_timer(void)
 {
         int apic1, pin1, apic2, pin2;
         int vector;
+        cpumask_t mask;
 
         /*
          * get/set the timer IRQ vector:
          */
         disable_8259A_irq(0);
-        vector = assign_irq_vector(0, TARGET_CPUS);
+        vector = assign_irq_vector(0, TARGET_CPUS, &mask);
 
         /*
          * Subtle, code in do_timer_interrupt() expects an AEOI
@@ -1667,6 +1713,7 @@ int create_irq(void)
         int new;
         int vector = 0;
         unsigned long flags;
+        cpumask_t mask;
 
         irq = -ENOSPC;
         spin_lock_irqsave(&vector_lock, flags);
@@ -1675,7 +1722,7 @@ int create_irq(void)
                         continue;
                 if (irq_vector[new] != 0)
                         continue;
-                vector = __assign_irq_vector(new, TARGET_CPUS);
+                vector = __assign_irq_vector(new, TARGET_CPUS, &mask);
                 if (likely(vector > 0))
                         irq = new;
                 break;
@@ -1707,13 +1754,10 @@ static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_ms
 {
         int vector;
         unsigned dest;
+        cpumask_t tmp;
 
-        vector = assign_irq_vector(irq, TARGET_CPUS);
+        vector = assign_irq_vector(irq, TARGET_CPUS, &tmp);
         if (vector >= 0) {
-                cpumask_t tmp;
-
-                cpus_clear(tmp);
-                cpu_set(vector >> 8, tmp);
                 dest = cpu_mask_to_apicid(tmp);
 
                 msg->address_hi = MSI_ADDR_BASE_HI;
@@ -1752,12 +1796,10 @@ static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
 
         cpus_and(mask, tmp, CPU_MASK_ALL);
 
-        vector = assign_irq_vector(irq, mask);
+        vector = assign_irq_vector(irq, mask, &tmp);
         if (vector < 0)
                 return;
 
-        cpus_clear(tmp);
-        cpu_set(vector >> 8, tmp);
         dest = cpu_mask_to_apicid(tmp);
 
         read_msi_msg(irq, &msg);
@@ -1844,12 +1886,10 @@ static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
 
         cpus_and(mask, tmp, CPU_MASK_ALL);
 
-        vector = assign_irq_vector(irq, mask);
+        vector = assign_irq_vector(irq, mask, &tmp);
         if (vector < 0)
                 return;
 
-        cpus_clear(tmp);
-        cpu_set(vector >> 8, tmp);
         dest = cpu_mask_to_apicid(tmp);
 
         target_ht_irq(irq, dest, vector & 0xff);
@@ -1871,15 +1911,13 @@ static struct hw_interrupt_type ht_irq_chip = {
 int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
 {
         int vector;
+        cpumask_t tmp;
 
-        vector = assign_irq_vector(irq, TARGET_CPUS);
+        vector = assign_irq_vector(irq, TARGET_CPUS, &tmp);
         if (vector >= 0) {
                 u32 low, high;
                 unsigned dest;
-                cpumask_t tmp;
 
-                cpus_clear(tmp);
-                cpu_set(vector >> 8, tmp);
                 dest = cpu_mask_to_apicid(tmp);
 
                 high =  HT_IRQ_HIGH_DEST_ID(dest);
@@ -1945,13 +1983,10 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int p
                 add_pin_to_irq(irq, ioapic, pin);
 
 
-        vector = assign_irq_vector(irq, TARGET_CPUS);
+        vector = assign_irq_vector(irq, TARGET_CPUS, &mask);
         if (vector < 0)
                 return vector;
 
-        cpus_clear(mask);
-        cpu_set(vector >> 8, mask);
-
         /*
          * Generate a PCI IRQ routing entry and program the IOAPIC accordingly.
          * Note that we mask (disable) IRQs now -- these get enabled when the