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95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
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/*
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* PCI Backend -- Configuration overlay for MSI capability
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*/
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include "conf_space.h"
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#include "conf_space_capability.h"
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#include <xen/interface/io/pciif.h>
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#include <xen/events.h>
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#include "pciback.h"
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int pciback_enable_msi(struct pciback_device *pdev,
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struct pci_dev *dev, struct xen_pci_op *op)
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{
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int otherend = pdev->xdev->otherend_id;
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int status;
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status = pci_enable_msi(dev);
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if (status) {
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printk(KERN_ERR "error enable msi for guest %x status %x\n",
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otherend, status);
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op->value = 0;
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return XEN_PCI_ERR_op_failed;
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}
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/* The value the guest needs is actually the IDT vector, not the
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* the local domain's IRQ number. */
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op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0;
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return 0;
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}
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int pciback_disable_msi(struct pciback_device *pdev,
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struct pci_dev *dev, struct xen_pci_op *op)
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{
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pci_disable_msi(dev);
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op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0;
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return 0;
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}
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int pciback_enable_msix(struct pciback_device *pdev,
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struct pci_dev *dev, struct xen_pci_op *op)
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{
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int i, result;
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struct msix_entry *entries;
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if (op->value > SH_INFO_MAX_VEC)
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return -EINVAL;
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entries = kmalloc(op->value * sizeof(*entries), GFP_KERNEL);
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if (entries == NULL)
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return -ENOMEM;
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for (i = 0; i < op->value; i++) {
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entries[i].entry = op->msix_entries[i].entry;
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entries[i].vector = op->msix_entries[i].vector;
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}
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result = pci_enable_msix(dev, entries, op->value);
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if (result == 0) {
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for (i = 0; i < op->value; i++) {
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op->msix_entries[i].entry = entries[i].entry;
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if (entries[i].vector)
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op->msix_entries[i].vector =
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xen_pirq_from_irq(entries[i].vector);
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}
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} else {
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printk(KERN_WARNING "pciback: %s: failed to enable MSI-X: err %d!\n",
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pci_name(dev), result);
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}
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kfree(entries);
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op->value = result;
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return result;
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}
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int pciback_disable_msix(struct pciback_device *pdev,
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struct pci_dev *dev, struct xen_pci_op *op)
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{
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pci_disable_msix(dev);
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/*
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* SR-IOV devices (which don't have any legacy IRQ) have
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* an undefined IRQ value of zero.
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*/
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op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0;
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return 0;
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}
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