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iommu/amd: Add IOAPIC remapping routines 

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>
This commit is contained in:
Joerg Roedel 2012-06-26 11:17:32 +02:00
parent 2b32450634
commit 5527de744d
1 changed files with 126 additions and 0 deletions
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126
drivers/iommu/amd_iommu.c
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@ -4000,4 +4000,130 @@ 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_iommu *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_2_iommu;
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->sub_handle = devid;
irte_info->irte_index = index;
irte_info->iommu = (void *)cfg;
/* 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;
}
static int set_affinity(struct irq_data *data, const struct cpumask *mask,
bool force)
{
struct irq_2_iommu *irte_info;
unsigned int dest, irq;
struct irq_cfg *cfg;
union irte irte;
int err;
if (!config_enabled(CONFIG_SMP))
return -1;
cfg = data->chip_data;
irq = data->irq;
irte_info = &cfg->irq_2_iommu;
if (!cpumask_intersects(mask, cpu_online_mask))
return -EINVAL;
if (get_irte(irte_info->sub_handle, irte_info->irte_index, &irte))
return -EBUSY;
if (assign_irq_vector(irq, cfg, mask))
return -EBUSY;
err = apic->cpu_mask_to_apicid_and(cfg->domain, mask, &dest);
if (err) {
if (assign_irq_vector(irq, cfg, data->affinity))
pr_err("AMD-Vi: Failed to recover vector for irq %d\n", irq);
return err;
}
irte.fields.vector = cfg->vector;
irte.fields.destination = dest;
modify_irte(irte_info->sub_handle, irte_info->irte_index, irte);
if (cfg->move_in_progress)
send_cleanup_vector(cfg);
cpumask_copy(data->affinity, mask);
return 0;
}
static int free_irq(int irq)
{
struct irq_2_iommu *irte_info;
struct irq_cfg *cfg;
cfg = irq_get_chip_data(irq);
if (!cfg)
return -EINVAL;
irte_info = &cfg->irq_2_iommu;
free_irte(irte_info->sub_handle, irte_info->irte_index);
return 0;
}
#endif