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iommu/amd: Implement MSI routines for interrupt remapping

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Add routines to setup interrupt remapping for MSI
interrupts.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2012-06-26 14:54:17 +02:00
parent 5527de744d
commit 0b4d48cb22
1 changed files with 74 additions and 0 deletions
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74
drivers/iommu/amd_iommu.c
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@ -4126,4 +4126,78 @@ static int free_irq(int irq)
return 0;
}
static void compose_msi_msg(struct pci_dev *pdev,
unsigned int irq, unsigned int dest,
struct msi_msg *msg, u8 hpet_id)
{
struct irq_2_iommu *irte_info;
struct irq_cfg *cfg;
union irte irte;
cfg = irq_get_chip_data(irq);
if (!cfg)
return;
irte_info = &cfg->irq_2_iommu;
irte.val = 0;
irte.fields.vector = cfg->vector;
irte.fields.int_type = apic->irq_delivery_mode;
irte.fields.destination = dest;
irte.fields.dm = apic->irq_dest_mode;
irte.fields.valid = 1;
modify_irte(irte_info->sub_handle, irte_info->irte_index, irte);
msg->address_hi = MSI_ADDR_BASE_HI;
msg->address_lo = MSI_ADDR_BASE_LO;
msg->data = irte_info->irte_index;
}
static int msi_alloc_irq(struct pci_dev *pdev, int irq, int nvec)
{
struct irq_cfg *cfg;
int index;
u16 devid;
if (!pdev)
return -EINVAL;
cfg = irq_get_chip_data(irq);
if (!cfg)
return -EINVAL;
devid = get_device_id(&pdev->dev);
index = alloc_irq_index(cfg, devid, nvec);
return index < 0 ? MAX_IRQS_PER_TABLE : index;
}
static int msi_setup_irq(struct pci_dev *pdev, unsigned int irq,
int index, int offset)
{
struct irq_2_iommu *irte_info;
struct irq_cfg *cfg;
u16 devid;
if (!pdev)
return -EINVAL;
cfg = irq_get_chip_data(irq);
if (!cfg)
return -EINVAL;
if (index >= MAX_IRQS_PER_TABLE)
return 0;
devid = get_device_id(&pdev->dev);
irte_info = &cfg->irq_2_iommu;
irte_info->sub_handle = devid;
irte_info->irte_index = index + offset;
irte_info->iommu = (void *)cfg;
return 0;
}
#endif