/* 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); }