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author | Joerg Roedel <joerg.roedel@amd.com> | 2012-03-30 11:47:03 -0700 |
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committer | Joerg Roedel <joerg.roedel@amd.com> | 2012-05-07 14:34:59 +0200 |
commit | 4c1bad6a0af1e297c8d05365e65af89d8c7bf9d1 (patch) | |
tree | a369a0bfd4c744b67e218ef294753a1ccc38b13a /drivers | |
parent | 0c3f173a88c4ae3e4253427cf574a59ad5352918 (diff) | |
download | linux-4c1bad6a0af1e297c8d05365e65af89d8c7bf9d1.tar.gz linux-4c1bad6a0af1e297c8d05365e65af89d8c7bf9d1.tar.bz2 linux-4c1bad6a0af1e297c8d05365e65af89d8c7bf9d1.zip |
iommu/vt-d: Convert IR set_affinity function to remap_ops
The function to set interrupt affinity with interrupt
remapping enabled is Intel specific too. So move it to the
irq_remap_ops too.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/iommu/intel_intr_remapping.c | 54 | ||||
-rw-r--r-- | drivers/iommu/intr_remapping.c | 9 | ||||
-rw-r--r-- | drivers/iommu/intr_remapping.h | 6 |
3 files changed, 69 insertions, 0 deletions
diff --git a/drivers/iommu/intel_intr_remapping.c b/drivers/iommu/intel_intr_remapping.c index f495eba4b6ab..25372c1f3c8c 100644 --- a/drivers/iommu/intel_intr_remapping.c +++ b/drivers/iommu/intel_intr_remapping.c @@ -901,6 +901,59 @@ static int intel_setup_ioapic_entry(int irq, return 0; } +/* + * Migrate the IO-APIC irq in the presence of intr-remapping. + * + * For both level and edge triggered, irq migration is a simple atomic + * update(of vector and cpu destination) of IRTE and flush the hardware cache. + * + * For level triggered, we eliminate the io-apic RTE modification (with the + * 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 +intel_ioapic_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 (!cpumask_intersects(mask, cpu_online_mask)) + return -EINVAL; + + if (get_irte(irq, &irte)) + return -EBUSY; + + if (assign_irq_vector(irq, cfg, mask)) + return -EBUSY; + + dest = apic->cpu_mask_to_apicid_and(cfg->domain, mask); + + irte.vector = cfg->vector; + irte.dest_id = IRTE_DEST(dest); + + /* + * 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); + + cpumask_copy(data->affinity, mask); + return 0; +} struct irq_remap_ops intel_irq_remap_ops = { .supported = intel_intr_remapping_supported, @@ -910,4 +963,5 @@ struct irq_remap_ops intel_irq_remap_ops = { .hardware_reenable = reenable_intr_remapping, .enable_faulting = enable_drhd_fault_handling, .setup_ioapic_entry = intel_setup_ioapic_entry, + .set_affinity = intel_ioapic_set_affinity, }; diff --git a/drivers/iommu/intr_remapping.c b/drivers/iommu/intr_remapping.c index 739148ab2538..2f4f27ffb861 100644 --- a/drivers/iommu/intr_remapping.c +++ b/drivers/iommu/intr_remapping.c @@ -110,3 +110,12 @@ int intr_setup_ioapic_entry(int irq, return remap_ops->setup_ioapic_entry(irq, entry, destination, vector, attr); } + +int intr_set_affinity(struct irq_data *data, const struct cpumask *mask, + bool force) +{ + if (!remap_ops || !remap_ops->set_affinity) + return 0; + + return remap_ops->set_affinity(data, mask, force); +} diff --git a/drivers/iommu/intr_remapping.h b/drivers/iommu/intr_remapping.h index e8994f2b3bbe..e0bc6e0ba1fb 100644 --- a/drivers/iommu/intr_remapping.h +++ b/drivers/iommu/intr_remapping.h @@ -26,6 +26,8 @@ struct IO_APIC_route_entry; struct io_apic_irq_attr; +struct irq_data; +struct cpumask; extern int disable_intremap; extern int disable_sourceid_checking; @@ -54,6 +56,10 @@ struct irq_remap_ops { int (*setup_ioapic_entry)(int irq, struct IO_APIC_route_entry *, unsigned int, int, struct io_apic_irq_attr *); + + /* Set the CPU affinity of a remapped interrupt */ + int (*set_affinity)(struct irq_data *data, const struct cpumask *mask, + bool force); }; extern struct irq_remap_ops intel_irq_remap_ops; |