x86: SGI UV: Fix irq affinity for hub based interrupts

This patch fixes handling of uv hub irq affinity.  IRQs with ALL or
NODE affinity can be routed to cpus other than their originally
assigned cpu.  Those with CPU affinity cannot be rerouted.

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
LKML-Reference: <20090930160259.GA7822@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 45 insertions, 4 deletions

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 8c718c93d079..bb52e7f6e953 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3731,9 +3731,10 @@ int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
  * on the specified blade to allow the sending of MSIs to the specified CPU.
  */
 int arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade,
-                       unsigned long mmr_offset)
+                       unsigned long mmr_offset, int restrict)
 {
         const struct cpumask *eligible_cpu = cpumask_of(cpu);
+        struct irq_desc *desc = irq_to_desc(irq);
         struct irq_cfg *cfg;
         int mmr_pnode;
         unsigned long mmr_value;
@@ -3749,6 +3750,11 @@ int arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade,
         if (err != 0)
                 return err;
 
+        if (restrict == UV_AFFINITY_CPU)
+                desc->status |= IRQ_NO_BALANCING;
+        else
+                desc->status |= IRQ_MOVE_PCNTXT;
+
         spin_lock_irqsave(&vector_lock, flags);
         set_irq_chip_and_handler_name(irq, &uv_irq_chip, handle_percpu_irq,
                                       irq_name);
@@ -3777,11 +3783,10 @@ int arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade,
  * Disable the specified MMR located on the specified blade so that MSIs are
  * longer allowed to be sent.
  */
-void arch_disable_uv_irq(int mmr_blade, unsigned long mmr_offset)
+void arch_disable_uv_irq(int mmr_pnode, unsigned long mmr_offset)
 {
         unsigned long mmr_value;
         struct uv_IO_APIC_route_entry *entry;
-        int mmr_pnode;
 
         BUILD_BUG_ON(sizeof(struct uv_IO_APIC_route_entry) != sizeof(unsigned long));
 
@@ -3789,9 +3794,45 @@ void arch_disable_uv_irq(int mmr_blade, unsigned long mmr_offset)
         entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
         entry->mask = 1;
 
-        mmr_pnode = uv_blade_to_pnode(mmr_blade);
         uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value);
 }
+
+int uv_set_irq_affinity(unsigned int irq, const struct cpumask *mask)
+{
+        struct irq_desc *desc = irq_to_desc(irq);
+        struct irq_cfg *cfg = desc->chip_data;
+        unsigned int dest;
+        unsigned long mmr_value;
+        struct uv_IO_APIC_route_entry *entry;
+        unsigned long mmr_offset;
+        unsigned mmr_pnode;
+
+        dest = set_desc_affinity(desc, mask);
+        if (dest == BAD_APICID)
+                return -1;
+
+        mmr_value = 0;
+        entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
+
+        entry->vector = cfg->vector;
+        entry->delivery_mode = apic->irq_delivery_mode;
+        entry->dest_mode = apic->irq_dest_mode;
+        entry->polarity = 0;
+        entry->trigger = 0;
+        entry->mask = 0;
+        entry->dest = dest;
+
+        /* Get previously stored MMR and pnode of hub sourcing interrupts */
+        if (uv_irq_2_mmr_info(irq, &mmr_offset, &mmr_pnode))
+                return -1;
+
+        uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value);
+
+        if (cfg->move_in_progress)
+                send_cleanup_vector(cfg);
+
+        return 0;
+}
 #endif /* CONFIG_X86_64 */
 
 int __init io_apic_get_redir_entries (int ioapic)