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Subject[PATCH 22/28] iommu/amd: Implement MSI routines for interrupt remapping
Date
Add routines to setup interrupt remapping for MSI
interrupts.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
drivers/iommu/amd_iommu.c | 74 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 74 insertions(+)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index dc2e699..ee10f30 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -4054,4 +4054,78 @@ 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_irte *irte_info;
+ struct irq_cfg *cfg;
+ union irte irte;
+
+ cfg = irq_get_chip_data(irq);
+ if (!cfg)
+ return;
+
+ irte_info = &cfg->irq_remap_info.irq_2_irte;
+
+ 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->devid, irte_info->index, irte);
+
+ msg->address_hi = MSI_ADDR_BASE_HI;
+ msg->address_lo = MSI_ADDR_BASE_LO;
+ msg->data = irte_info->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_irte *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_remap_info.irq_2_irte;
+
+ irte_info->devid = devid;
+ irte_info->index = index + offset;
+ cfg->remapped = true;
+
+ return 0;
+}
+
#endif
--
1.7.9.5



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