/* Performing the configuration space reads/writes must not be done in atomic
* context because some of the pci_* functions can sleep (mostly due to ACPI
* use of semaphores). This function is intended to be called from a work
* queue in process context taking a struct pciback_device as a parameter */
void pciback_do_op(void *data)
{
struct pciback_device *pdev = data;
struct pci_dev *dev;
struct xen_pci_op *op = &pdev->sh_info->op;
dev = pciback_get_pci_dev(pdev, op->domain, op->bus, op->devfn);
if (dev == NULL)
op->err = XEN_PCI_ERR_dev_not_found;
else if (op->cmd == XEN_PCI_OP_conf_read)
op->err = pciback_config_read(dev, op->offset, op->size,
&op->value);
else if (op->cmd == XEN_PCI_OP_conf_write)
op->err = pciback_config_write(dev, op->offset, op->size,
op->value);
else
op->err = XEN_PCI_ERR_not_implemented;
/* Tell the driver domain that we're done. */
wmb();
clear_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags);
notify_remote_via_irq(pdev->evtchn_irq);
/* Mark that we're done. */
smp_mb__before_clear_bit(); /* /after/ clearing PCIF_active */
clear_bit(_PDEVF_op_active, &pdev->flags);
smp_mb__after_clear_bit(); /* /before/ final check for work */
/* Check to see if the driver domain tried to start another request in
* between clearing _XEN_PCIF_active and clearing _PDEVF_op_active. */
test_and_schedule_op(pdev);
}
/* Performing the configuration space reads/writes must not be done in atomic
* context because some of the pci_* functions can sleep (mostly due to ACPI
* use of semaphores). This function is intended to be called from a work
* queue in process context taking a struct pciback_device as a parameter */
void pciback_do_op(struct work_struct *work)
{
struct pciback_device *pdev = container_of(work, struct pciback_device, op_work);
struct pci_dev *dev;
struct xen_pci_op *op = &pdev->sh_info->op;
dev = pciback_get_pci_dev(pdev, op->domain, op->bus, op->devfn);
if (dev == NULL)
op->err = XEN_PCI_ERR_dev_not_found;
else
{
switch (op->cmd)
{
case XEN_PCI_OP_conf_read:
op->err = pciback_config_read(dev,
op->offset, op->size, &op->value);
break;
case XEN_PCI_OP_conf_write:
op->err = pciback_config_write(dev,
op->offset, op->size, op->value);
break;
#ifdef CONFIG_PCI_MSI
case XEN_PCI_OP_enable_msi:
op->err = pciback_enable_msi(pdev, dev, op);
break;
case XEN_PCI_OP_disable_msi:
op->err = pciback_disable_msi(pdev, dev, op);
break;
case XEN_PCI_OP_enable_msix:
op->err = pciback_enable_msix(pdev, dev, op);
break;
case XEN_PCI_OP_disable_msix:
op->err = pciback_disable_msix(pdev, dev, op);
break;
#endif
default:
op->err = XEN_PCI_ERR_not_implemented;
break;
}
}
/* Tell the driver domain that we're done. */
wmb();
clear_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags);
notify_remote_via_irq(pdev->evtchn_irq);
/* Mark that we're done. */
smp_mb__before_clear_bit(); /* /after/ clearing PCIF_active */
clear_bit(_PDEVF_op_active, &pdev->flags);
smp_mb__after_clear_bit(); /* /before/ final check for work */
/* Check to see if the driver domain tried to start another request in
* between clearing _XEN_PCIF_active and clearing _PDEVF_op_active.
*/
test_and_schedule_op(pdev);
}
