On 08/11/11 10:36, Jan Beulich wrote:
> The vector is already being tracked in struct irq_desc's arch.vector
> member, so there's no real need for a second place where this to get
> stored. The only caveat is that legacy vectors (used for interrupts
> handled through the 8259) must be special cased to not prevent non-
> legacy vectors from being assigned.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Seems you have beaten me to this. I had an untested patch to remove
irq_vector but this is much cleaner.
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> --- a/xen/arch/x86/io_apic.c
> +++ b/xen/arch/x86/io_apic.c
> @@ -452,10 +452,10 @@ static void unmask_IO_APIC_irq(struct ir
> spin_unlock_irqrestore(&ioapic_lock, flags);
> }
>
> -static void __eoi_IO_APIC_irq(unsigned int irq)
> +static void __eoi_IO_APIC_irq(struct irq_desc *desc)
> {
> - struct irq_pin_list *entry = irq_2_pin + irq;
> - unsigned int pin, vector = IO_APIC_VECTOR(irq);
> + struct irq_pin_list *entry = irq_2_pin + desc->irq;
> + unsigned int pin, vector = desc->arch.vector;
>
> for (;;) {
> pin = entry->pin;
> @@ -468,11 +468,11 @@ static void __eoi_IO_APIC_irq(unsigned i
> }
> }
>
> -static void eoi_IO_APIC_irq(unsigned int irq)
> +static void eoi_IO_APIC_irq(struct irq_desc *desc)
> {
> unsigned long flags;
> spin_lock_irqsave(&ioapic_lock, flags);
> - __eoi_IO_APIC_irq(irq);
> + __eoi_IO_APIC_irq(desc);
> spin_unlock_irqrestore(&ioapic_lock, flags);
> }
>
> @@ -1200,7 +1200,7 @@ static void /*__init*/ __print_IO_APIC(v
> struct irq_pin_list *entry = irq_2_pin + i;
> if (entry->pin < 0)
> continue;
> - printk(KERN_DEBUG "IRQ%d ", IO_APIC_VECTOR(i));
> + printk(KERN_DEBUG "IRQ%d ", irq_to_desc(i)->arch.vector);
> for (;;) {
> printk("-> %d:%d", entry->apic, entry->pin);
> if (!entry->next)
> @@ -1621,7 +1621,7 @@ static void mask_and_ack_level_ioapic_ir
> * operation to prevent an edge-triggered interrupt escaping meanwhile.
> * The idea is from Manfred Spraul. --macro
> */
> - i = IO_APIC_VECTOR(desc->irq);
> + i = desc->arch.vector;
>
> v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
>
> @@ -1653,12 +1653,12 @@ static void end_level_ioapic_irq(struct
> {
> if ( !(desc->status & (IRQ_DISABLED|IRQ_MOVE_PENDING)) )
> {
> - eoi_IO_APIC_irq(desc->irq);
> + eoi_IO_APIC_irq(desc);
> return;
> }
>
> mask_IO_APIC_irq(desc);
> - eoi_IO_APIC_irq(desc->irq);
> + eoi_IO_APIC_irq(desc);
> if ( (desc->status & IRQ_MOVE_PENDING) &&
> !io_apic_level_ack_pending(desc->irq) )
> move_masked_irq(desc);
> @@ -1689,7 +1689,7 @@ static void end_level_ioapic_irq(struct
> * operation to prevent an edge-triggered interrupt escaping meanwhile.
> * The idea is from Manfred Spraul. --macro
> */
> - i = IO_APIC_VECTOR(desc->irq);
> + i = desc->arch.vector;
>
> /* Manually EOI the old vector if we are moving to the new */
> if ( vector && i != vector )
> @@ -1752,7 +1752,7 @@ static inline void init_IO_APIC_traps(vo
> int irq;
> /* Xen: This is way simpler than the Linux implementation. */
> for (irq = 0; platform_legacy_irq(irq); irq++)
> - if (IO_APIC_IRQ(irq) && !IO_APIC_VECTOR(irq))
> + if (IO_APIC_IRQ(irq) && !irq_to_vector(irq))
> make_8259A_irq(irq);
> }
>
> --- a/xen/arch/x86/irq.c
> +++ b/xen/arch/x86/irq.c
> @@ -41,7 +41,6 @@ custom_param("irq_vector_map", parse_irq
>
> vmask_t global_used_vector_map;
>
> -u8 __read_mostly *irq_vector;
> struct irq_desc __read_mostly *irq_desc = NULL;
>
> static DECLARE_BITMAP(used_vectors, NR_VECTORS);
> @@ -135,8 +134,6 @@ static int __init __bind_irq_vector(int
> set_bit(vector, desc->arch.used_vectors);
> }
> desc->arch.used = IRQ_USED;
> - if (IO_APIC_IRQ(irq))
> - irq_vector[irq] = vector;
> return 0;
> }
>
> @@ -289,7 +286,11 @@ int irq_to_vector(int irq)
> BUG_ON(irq >= nr_irqs || irq < 0);
>
> if (IO_APIC_IRQ(irq))
> - vector = irq_vector[irq];
> + {
> + vector = irq_to_desc(irq)->arch.vector;
> + if (vector >= FIRST_LEGACY_VECTOR && vector <= LAST_LEGACY_VECTOR)
> + vector = 0;
> + }
> else if (MSI_IRQ(irq))
> vector = irq_to_desc(irq)->arch.vector;
> else
> @@ -331,9 +332,8 @@ int __init init_irq_data(void)
> this_cpu(vector_irq)[vector] = -1;
>
> irq_desc = xzalloc_array(struct irq_desc, nr_irqs);
> - irq_vector = xzalloc_array(u8, nr_irqs_gsi);
>
> - if ( !irq_desc || !irq_vector )
> + if ( !irq_desc )
> return -ENOMEM;
>
> for (irq = 0; irq < nr_irqs_gsi; irq++) {
> @@ -426,7 +426,7 @@ static int __assign_irq_vector(
> vmask_t *irq_used_vectors = NULL;
>
> old_vector = irq_to_vector(irq);
> - if (old_vector) {
> + if (old_vector > 0) {
> cpumask_and(&tmp_mask, mask, &cpu_online_map);
> if (cpumask_intersects(&tmp_mask, desc->arch.cpu_mask)) {
> desc->arch.vector = old_vector;
> @@ -485,7 +485,7 @@ next:
> /* Found one! */
> current_vector = vector;
> current_offset = offset;
> - if (old_vector) {
> + if (old_vector > 0) {
> desc->arch.move_in_progress = 1;
> cpumask_copy(desc->arch.old_cpu_mask, desc->arch.cpu_mask);
> desc->arch.old_vector = desc->arch.vector;
> @@ -501,9 +501,6 @@ next:
> || (desc->arch.used_vectors == irq_used_vectors));
> desc->arch.used_vectors = irq_used_vectors;
>
> - if (IO_APIC_IRQ(irq))
> - irq_vector[irq] = vector;
> -
> if ( desc->arch.used_vectors )
> {
> ASSERT(!test_bit(vector, desc->arch.used_vectors));
> --- a/xen/arch/x86/smpboot.c
> +++ b/xen/arch/x86/smpboot.c
> @@ -998,7 +998,7 @@ void __init smp_intr_init(void)
> * IRQ0 must be given a fixed assignment and initialized,
> * because it's used before the IO-APIC is set up.
> */
> - irq_vector[0] = FIRST_HIPRIORITY_VECTOR;
> + irq_to_desc(0)->arch.vector = FIRST_HIPRIORITY_VECTOR;
>
> /*
> * Also ensure serial interrupts are high priority. We do not
> @@ -1008,7 +1008,6 @@ void __init smp_intr_init(void)
> {
> if ( (irq = serial_irq(seridx)) < 0 )
> continue;
> - irq_vector[irq] = FIRST_HIPRIORITY_VECTOR + seridx + 1;
> per_cpu(vector_irq, cpu)[FIRST_HIPRIORITY_VECTOR + seridx + 1] = irq;
> irq_to_desc(irq)->arch.vector = FIRST_HIPRIORITY_VECTOR + seridx + 1;
> cpumask_copy(irq_to_desc(irq)->arch.cpu_mask, &cpu_online_map);
> --- a/xen/include/asm-x86/irq.h
> +++ b/xen/include/asm-x86/irq.h
> @@ -14,7 +14,6 @@
> #define IO_APIC_IRQ(irq) (platform_legacy_irq(irq) ? \
> (1 << (irq)) & io_apic_irqs : \
> (irq) < nr_irqs_gsi)
> -#define IO_APIC_VECTOR(irq) (irq_vector[irq])
>
> #define MSI_IRQ(irq) ((irq) >= nr_irqs_gsi && (irq) < nr_irqs)
>
> @@ -48,8 +47,6 @@ struct arch_irq_desc {
> typedef int vector_irq_t[NR_VECTORS];
> DECLARE_PER_CPU(vector_irq_t, vector_irq);
>
> -extern u8 *irq_vector;
> -
> extern bool_t opt_noirqbalance;
>
> #define OPT_IRQ_VECTOR_MAP_DEFAULT 0 /* Do the default thing */
>
>
--
Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
T: +44 (0)1223 225 900, http://www.citrix.com
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