x86: change FIRST_SYSTEM_VECTOR to a variable

The SGI UV system needs several more system vectors than a vanilla
x86_64 system.  Rather than burden the other archs with extra system
vectors that they don't use, change FIRST_SYSTEM_VECTOR to a variable,
so that it can be dynamic.

Signed-off-by: Alan Mayer <ajm@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c
index 4b99b1b..807158e 100644 (file)
--- a/arch/x86/kernel/apic_32.c
+++ b/arch/x86/kernel/apic_32.c
@@ -1351,13 +1351,13 @@ void __init smp_intr_init(void)
         * The reschedule interrupt is a CPU-to-CPU reschedule-helper
         * IPI, driven by wakeup.
         */
-       set_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
+       alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
 
        /* IPI for invalidation */
-       set_intr_gate(INVALIDATE_TLB_VECTOR, invalidate_interrupt);
+       alloc_intr_gate(INVALIDATE_TLB_VECTOR, invalidate_interrupt);
 
        /* IPI for generic function call */
-       set_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
+       alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
 }
 #endif
 
@@ -1370,15 +1370,15 @@ void __init apic_intr_init(void)
        smp_intr_init();
 #endif
        /* self generated IPI for local APIC timer */
-       set_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
+       alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
 
        /* IPI vectors for APIC spurious and error interrupts */
-       set_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
-       set_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
+       alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
+       alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
 
        /* thermal monitor LVT interrupt */
 #ifdef CONFIG_X86_MCE_P4THERMAL
-       set_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
+       alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
 #endif
 }
 

diff --git a/arch/x86/kernel/i8259_64.c b/arch/x86/kernel/i8259_64.c
index c4ae476..1870e0e 100644 (file)
--- a/arch/x86/kernel/i8259_64.c
+++ b/arch/x86/kernel/i8259_64.c
@@ -493,33 +493,33 @@ void __init native_init_IRQ(void)
         * The reschedule interrupt is a CPU-to-CPU reschedule-helper
         * IPI, driven by wakeup.
         */
-       set_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
+       alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
 
        /* IPIs for invalidation */
-       set_intr_gate(INVALIDATE_TLB_VECTOR_START+0, invalidate_interrupt0);
-       set_intr_gate(INVALIDATE_TLB_VECTOR_START+1, invalidate_interrupt1);
-       set_intr_gate(INVALIDATE_TLB_VECTOR_START+2, invalidate_interrupt2);
-       set_intr_gate(INVALIDATE_TLB_VECTOR_START+3, invalidate_interrupt3);
-       set_intr_gate(INVALIDATE_TLB_VECTOR_START+4, invalidate_interrupt4);
-       set_intr_gate(INVALIDATE_TLB_VECTOR_START+5, invalidate_interrupt5);
-       set_intr_gate(INVALIDATE_TLB_VECTOR_START+6, invalidate_interrupt6);
-       set_intr_gate(INVALIDATE_TLB_VECTOR_START+7, invalidate_interrupt7);
+       alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+0, invalidate_interrupt0);
+       alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+1, invalidate_interrupt1);
+       alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+2, invalidate_interrupt2);
+       alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+3, invalidate_interrupt3);
+       alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+4, invalidate_interrupt4);
+       alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+5, invalidate_interrupt5);
+       alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+6, invalidate_interrupt6);
+       alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+7, invalidate_interrupt7);
 
        /* IPI for generic function call */
-       set_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
+       alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
 
        /* Low priority IPI to cleanup after moving an irq */
        set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
 #endif
-       set_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
-       set_intr_gate(THRESHOLD_APIC_VECTOR, threshold_interrupt);
+       alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
+       alloc_intr_gate(THRESHOLD_APIC_VECTOR, threshold_interrupt);
 
        /* self generated IPI for local APIC timer */
-       set_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
+       alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
 
        /* IPI vectors for APIC spurious and error interrupts */
-       set_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
-       set_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
+       alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
+       alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
 
        if (!acpi_ioapic)
                setup_irq(2, &irq2);

diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c
index a40d54f..0ae4a9d 100644 (file)
--- a/arch/x86/kernel/io_apic_32.c
+++ b/arch/x86/kernel/io_apic_32.c
@@ -83,6 +83,10 @@ int mp_irq_entries;
 
 static int disable_timer_pin_1 __initdata;
 
+int first_system_vector = 0xfe;
+
+char system_vectors[NR_VECTORS] = { [0 ... NR_VECTORS-1] = SYS_VECTOR_FREE};
+
 /*
  * Rough estimation of how many shared IRQs there are, can
  * be changed anytime.
@@ -1176,7 +1180,7 @@ static int __assign_irq_vector(int irq)
        offset = current_offset;
 next:
        vector += 8;
-       if (vector >= FIRST_SYSTEM_VECTOR) {
+       if (vector >= first_system_vector) {
                offset = (offset + 1) % 8;
                vector = FIRST_DEVICE_VECTOR + offset;
        }
@@ -2269,7 +2273,7 @@ void __init setup_IO_APIC(void)
        int i;
 
        /* Reserve all the system vectors. */
-       for (i = FIRST_SYSTEM_VECTOR; i < NR_VECTORS; i++)
+       for (i = first_system_vector; i < NR_VECTORS; i++)
                set_bit(i, used_vectors);
 
        enable_IO_APIC();

diff --git a/arch/x86/kernel/io_apic_64.c b/arch/x86/kernel/io_apic_64.c
index ef1a8df..f1e1ae3 100644 (file)
--- a/arch/x86/kernel/io_apic_64.c
+++ b/arch/x86/kernel/io_apic_64.c
@@ -82,6 +82,10 @@ struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
 
 static int assign_irq_vector(int irq, cpumask_t mask);
 
+int first_system_vector = 0xfe;
+
+char system_vectors[NR_VECTORS] = { [0 ... NR_VECTORS-1] = SYS_VECTOR_FREE};
+
 #define __apicdebuginit  __init
 
 int sis_apic_bug; /* not actually supported, dummy for compile */
@@ -730,7 +734,7 @@ static int __assign_irq_vector(int irq, cpumask_t mask)
                offset = current_offset;
 next:
                vector += 8;
-               if (vector >= FIRST_SYSTEM_VECTOR) {
+               if (vector >= first_system_vector) {
                        /* If we run out of vectors on large boxen, must share them. */
                        offset = (offset + 1) % 8;
                        vector = FIRST_DEVICE_VECTOR + offset;

diff --git a/include/asm-x86/desc.h b/include/asm-x86/desc.h
index 268a012..b3875d4 100644 (file)
--- a/include/asm-x86/desc.h
+++ b/include/asm-x86/desc.h
@@ -311,6 +311,28 @@ static inline void set_intr_gate(unsigned int n, void *addr)
        _set_gate(n, GATE_INTERRUPT, addr, 0, 0, __KERNEL_CS);
 }
 
+#define SYS_VECTOR_FREE                0
+#define SYS_VECTOR_ALLOCED     1
+
+extern int first_system_vector;
+extern char system_vectors[];
+
+static inline void alloc_system_vector(int vector)
+{
+       if (system_vectors[vector] == SYS_VECTOR_FREE) {
+               system_vectors[vector] = SYS_VECTOR_ALLOCED;
+               if (first_system_vector > vector)
+                       first_system_vector = vector;
+       } else
+               BUG();
+}
+
+static inline void alloc_intr_gate(unsigned int n, void *addr)
+{
+       alloc_system_vector(n);
+       set_intr_gate(n, addr);
+}
+
 /*
  * This routine sets up an interrupt gate at directory privilege level 3.
  */

diff --git a/include/asm-x86/irq_vectors.h b/include/asm-x86/irq_vectors.h
index daceaaf..3cb6d8c 100644 (file)
--- a/include/asm-x86/irq_vectors.h
+++ b/include/asm-x86/irq_vectors.h
@@ -96,8 +96,6 @@
 # define FIRST_DEVICE_VECTOR   (IRQ15_VECTOR + 2)
 #endif
 
-#define FIRST_SYSTEM_VECTOR    0xef
-
 #define NR_VECTORS             256
 
 #define FPU_IRQ                        13