x86/IRQ: desc->affinity should strictly represent the requested value

desc->arch.cpu_mask reflects the actual set of target CPUs. Don't ever
fiddle with desc->affinity itself, except to store caller requested
values. Note that assign_irq_vector() now takes a NULL incoming CPU mask
to mean "all CPUs" now, rather than just "all currently online CPUs".
This way no further affinity adjustment is needed after onlining further
CPUs.

This renders both set_native_irq_info() uses (which weren't using proper
locking anyway) redundant - drop the function altogether.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>

diff --git a/xen/arch/x86/io_apic.c b/xen/arch/x86/io_apic.c
index 7705ffc1137a5c4a3b44dfda4291afb5a8f82f7c..02e3a263a6c068fc3ee014be03ceb7ba16f66a43 100644 (file)
--- a/xen/arch/x86/io_apic.c
+++ b/xen/arch/x86/io_apic.c
@@ -1039,7 +1039,6 @@ static void __init setup_IO_APIC_irqs(void)
             SET_DEST(entry, logical, cpu_mask_to_apicid(TARGET_CPUS));
             spin_lock_irqsave(&ioapic_lock, flags);
             __ioapic_write_entry(apic, pin, 0, entry);
-            set_native_irq_info(irq, TARGET_CPUS);
             spin_unlock_irqrestore(&ioapic_lock, flags);
         }
     }
@@ -2248,7 +2247,6 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int a
 
     spin_lock_irqsave(&ioapic_lock, flags);
     __ioapic_write_entry(ioapic, pin, 0, entry);
-    set_native_irq_info(irq, TARGET_CPUS);
     spin_unlock(&ioapic_lock);
 
     spin_lock(&desc->lock);

diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c
index a55f3d4af86eac4c5b859baea56231ca438ff5f1..1acc351c67f7ba375a86020dd3883a62e7e4651a 100644 (file)
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -589,11 +589,16 @@ int assign_irq_vector(int irq, const cpumask_t *mask)
 
     spin_lock_irqsave(&vector_lock, flags);
     ret = __assign_irq_vector(irq, desc, mask ?: TARGET_CPUS);
-    if (!ret) {
+    if ( !ret )
+    {
         ret = desc->arch.vector;
-        cpumask_copy(desc->affinity, desc->arch.cpu_mask);
+        if ( mask )
+            cpumask_copy(desc->affinity, mask);
+        else
+            cpumask_setall(desc->affinity);
     }
     spin_unlock_irqrestore(&vector_lock, flags);
+
     return ret;
 }
 
@@ -2345,9 +2350,10 @@ static void dump_irqs(unsigned char key)
 
         spin_lock_irqsave(&desc->lock, flags);
 
-        printk("   IRQ:%4d aff:%*pb vec:%02x %-15s status=%03x ",
-               irq, nr_cpu_ids, cpumask_bits(desc->affinity), desc->arch.vector,
-               desc->handler->typename, desc->status);
+        printk("   IRQ:%4d aff:{%*pbl}/{%*pbl} vec:%02x %-15s status=%03x ",
+               irq, nr_cpu_ids, cpumask_bits(desc->affinity),
+               nr_cpu_ids, cpumask_bits(desc->arch.cpu_mask),
+               desc->arch.vector, desc->handler->typename, desc->status);
 
         if ( ssid )
             printk("Z=%-25s ", ssid);
@@ -2435,8 +2441,7 @@ void fixup_irqs(const cpumask_t *mask, bool verbose)
                 release_old_vec(desc);
         }
 
-        cpumask_copy(&affinity, desc->affinity);
-        if ( !desc->action || cpumask_subset(&affinity, mask) )
+        if ( !desc->action || cpumask_subset(desc->affinity, mask) )
         {
             spin_unlock(&desc->lock);
             continue;
@@ -2469,12 +2474,13 @@ void fixup_irqs(const cpumask_t *mask, bool verbose)
             desc->arch.move_in_progress = 0;
         }
 
-        cpumask_and(&affinity, &affinity, mask);
-        if ( cpumask_empty(&affinity) )
+        if ( !cpumask_intersects(mask, desc->affinity) )
         {
             break_affinity = true;
-            cpumask_copy(&affinity, mask);
+            cpumask_setall(&affinity);
         }
+        else
+            cpumask_copy(&affinity, desc->affinity);
 
         if ( desc->handler->disable )
             desc->handler->disable(desc);

diff --git a/xen/include/xen/irq.h b/xen/include/xen/irq.h
index 586b78393abd950c7c4950b7b62c1c827b4523c8..0f91884d5736b3d70e5b045ba0ebe573fdcc82d6 100644 (file)
--- a/xen/include/xen/irq.h
+++ b/xen/include/xen/irq.h
@@ -162,11 +162,6 @@ extern irq_desc_t *domain_spin_lock_irq_desc(
 extern irq_desc_t *pirq_spin_lock_irq_desc(
     const struct pirq *, unsigned long *pflags);
 
-static inline void set_native_irq_info(unsigned int irq, const cpumask_t *mask)
-{
-    cpumask_copy(irq_to_desc(irq)->affinity, mask);
-}
-
 unsigned int set_desc_affinity(struct irq_desc *, const cpumask_t *);
 
 #ifndef arch_hwdom_irqs