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Subject[PATCH 21/28] iommu/amd: Add IOAPIC remapping routines
Date
Add the routine to setup interrupt remapping for ioapic
interrupts. Also add a routine to change the affinity of an
irq and to free an irq allocation for interrupt remapping.
The last two functions will also be used for MSI interrupts.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
drivers/iommu/amd_iommu.c | 119 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 119 insertions(+)
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 6ec44ab..dc2e699 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3935,4 +3935,123 @@ static void free_irte(u16 devid, int index)
iommu_completion_wait(iommu);
}

+static int setup_ioapic_entry(int irq, struct IO_APIC_route_entry *entry,
+ unsigned int destination, int vector,
+ struct io_apic_irq_attr *attr)
+{
+ struct irq_remap_table *table;
+ struct irq_2_irte *irte_info;
+ struct irq_cfg *cfg;
+ union irte irte;
+ int ioapic_id;
+ int index;
+ int devid;
+ int ret;
+
+ cfg = irq_get_chip_data(irq);
+ if (!cfg)
+ return -EINVAL;
+
+ irte_info = &cfg->irq_remap_info.irq_2_irte;
+ ioapic_id = mpc_ioapic_id(attr->ioapic);
+ devid = get_ioapic_devid(ioapic_id);
+
+ if (devid < 0)
+ return devid;
+
+ table = get_irq_table(devid, true);
+ if (table == NULL)
+ return -ENOMEM;
+
+ index = attr->ioapic_pin;
+
+ /* Setup IRQ remapping info */
+ irte_info->devid = devid;
+ irte_info->index = index;
+ cfg->remapped = true;
+
+ /* Setup IRTE for IOMMU */
+ irte.val = 0;
+ irte.fields.vector = vector;
+ irte.fields.int_type = apic->irq_delivery_mode;
+ irte.fields.destination = destination;
+ irte.fields.dm = apic->irq_dest_mode;
+ irte.fields.valid = 1;
+
+ ret = modify_irte(devid, index, irte);
+ if (ret)
+ return ret;
+
+ /* Setup IOAPIC entry */
+ memset(entry, 0, sizeof(*entry));
+
+ entry->vector = index;
+ entry->mask = 0;
+ entry->trigger = attr->trigger;
+ entry->polarity = attr->polarity;
+
+ /*
+ * Mask level triggered irqs.
+ * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
+ */
+ if (attr->trigger)
+ entry->mask = 1;
+
+ return 0;
+}
+
+#ifdef CONFIG_SMP
+static int set_affinity(struct irq_data *data, const struct cpumask *mask,
+ bool force)
+{
+ struct irq_2_irte *irte_info;
+ unsigned int dest, irq;
+ struct irq_cfg *cfg;
+ union irte irte;
+
+ cfg = data->chip_data;
+ irq = data->irq;
+ irte_info = &cfg->irq_remap_info.irq_2_irte;
+
+ if (!cpumask_intersects(mask, cpu_online_mask))
+ return -EINVAL;
+
+ if (get_irte(irte_info->devid, irte_info->index, &irte))
+ return -EBUSY;
+
+ if (assign_irq_vector(irq, cfg, mask))
+ return -EBUSY;
+
+ dest = apic->cpu_mask_to_apicid_and(cfg->domain, mask);
+
+ irte.fields.vector = cfg->vector;
+ irte.fields.destination = dest;
+
+ modify_irte(irte_info->devid, irte_info->index, irte);
+
+ if (cfg->move_in_progress)
+ send_cleanup_vector(cfg);
+
+ cpumask_copy(data->affinity, mask);
+
+ return 0;
+}
+#endif /* CONFIG_SMP */
+
+static int free_irq(int irq)
+{
+ struct irq_2_irte *irte_info;
+ struct irq_cfg *cfg;
+
+ cfg = irq_get_chip_data(irq);
+ if (!cfg)
+ return -EINVAL;
+
+ irte_info = &cfg->irq_remap_info.irq_2_irte;
+
+ free_irte(irte_info->devid, irte_info->index);
+
+ return 0;
+}
+
#endif
--
1.7.9.5



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