diff options
| author | Suresh Siddha | 2011-08-24 02:05:23 +0200 |
|---|---|---|
| committer | Ingo Molnar | 2011-09-21 10:21:59 +0200 |
| commit | 13ea20f7a29aec1ed776de05f86bd892dc9ac395 (patch) | |
| tree | e84d3369f5a39dc38ce43823036c1028c1fa7dcd /arch | |
| parent | iommu: Cleanup ifdefs in detect_intel_iommu() (diff) | |
| download | kernel-qcow2-linux-13ea20f7a29aec1ed776de05f86bd892dc9ac395.tar.gz kernel-qcow2-linux-13ea20f7a29aec1ed776de05f86bd892dc9ac395.tar.xz kernel-qcow2-linux-13ea20f7a29aec1ed776de05f86bd892dc9ac395.zip | |
x86, msi, intr-remap: Use the ioapic set affinity routine
IRQ set affinity routine is same for the IO-APIC IRQ's aswell as
the MSI IRQ's in the presence of interrupt-remapping. This is
because we modify the interrupt-remapping table entry and
doesn't touch the IO-APIC RTE or the MSI entry.
So remove the ir_msi_set_affinity() and re-use the
ir_ioapic_set_affinity()
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: yinghai@kernel.org
Cc: youquan.song@intel.com
Cc: joerg.roedel@amd.com
Cc: tony.luck@intel.com
Cc: dwmw2@infradead.org
Link: http://lkml.kernel.org/r/20110824001456.452760446@sbsiddha-desk.sc.intel.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/apic/io_apic.c | 54 |
1 files changed, 12 insertions, 42 deletions
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index 8eb863e27ea6..f88af6b037c2 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -2267,6 +2267,9 @@ ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask, * updated vector information), by using a virtual vector (io-apic pin number). * Real vector that is used for interrupting cpu will be coming from * the interrupt-remapping table entry. + * + * As the migration is a simple atomic update of IRTE, the same mechanism + * is used to migrate MSI irq's in the presence of interrupt-remapping. */ static int ir_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask, @@ -2291,10 +2294,16 @@ ir_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask, irte.dest_id = IRTE_DEST(dest); /* - * Modified the IRTE and flushes the Interrupt entry cache. + * Atomically updates the IRTE with the new destination, vector + * and flushes the interrupt entry cache. */ modify_irte(irq, &irte); + /* + * After this point, all the interrupts will start arriving + * at the new destination. So, time to cleanup the previous + * vector allocation. + */ if (cfg->move_in_progress) send_cleanup_vector(cfg); @@ -3144,45 +3153,6 @@ msi_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force) return 0; } -#ifdef CONFIG_INTR_REMAP -/* - * Migrate the MSI irq to another cpumask. This migration is - * done in the process context using interrupt-remapping hardware. - */ -static int -ir_msi_set_affinity(struct irq_data *data, const struct cpumask *mask, - bool force) -{ - struct irq_cfg *cfg = data->chip_data; - unsigned int dest, irq = data->irq; - struct irte irte; - - if (get_irte(irq, &irte)) - return -1; - - if (__ioapic_set_affinity(data, mask, &dest)) - return -1; - - irte.vector = cfg->vector; - irte.dest_id = IRTE_DEST(dest); - - /* - * atomically update the IRTE with the new destination and vector. - */ - modify_irte(irq, &irte); - - /* - * After this point, all the interrupts will start arriving - * at the new destination. So, time to cleanup the previous - * vector allocation. - */ - if (cfg->move_in_progress) - send_cleanup_vector(cfg); - - return 0; -} - -#endif #endif /* CONFIG_SMP */ /* @@ -3207,7 +3177,7 @@ static struct irq_chip msi_ir_chip = { #ifdef CONFIG_INTR_REMAP .irq_ack = ir_ack_apic_edge, #ifdef CONFIG_SMP - .irq_set_affinity = ir_msi_set_affinity, + .irq_set_affinity = ir_ioapic_set_affinity, #endif #endif .irq_retrigger = ioapic_retrigger_irq, @@ -3416,7 +3386,7 @@ static struct irq_chip ir_hpet_msi_type = { #ifdef CONFIG_INTR_REMAP .irq_ack = ir_ack_apic_edge, #ifdef CONFIG_SMP - .irq_set_affinity = ir_msi_set_affinity, + .irq_set_affinity = ir_ioapic_set_affinity, #endif #endif .irq_retrigger = ioapic_retrigger_irq, |