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