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committed 865a11f987a// SPDX-License-Identifier: GPL-2.0/* uio_pci_generic - generic UIO driver for PCI 2.3 devices * * Copyright (C) 2009 Red Hat, Inc. * Author: Michael S. Tsirkin <mst@redhat.com> * * Since the driver does not declare any device ids, you must allocate * id and bind the device to the driver yourself. For example: * * # echo "8086 10f5" > /sys/bus/pci/drivers/uio_pci_generic/new_id * # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/e1000e/unbind * # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/uio_pci_generic/bind * # ls -l /sys/bus/pci/devices/0000:00:19.0/driver * .../0000:00:19.0/driver -> ../../../bus/pci/drivers/uio_pci_generic * * Driver won't bind to devices which do not support the Interrupt Disable Bit * in the command register. All devices compliant to PCI 2.3 (circa 2002) and * all compliant PCI Express devices should support this bit. */struct uio_pci_generic_dev { struct uio_info info; struct pci_dev *pdev;};static inline struct uio_pci_generic_dev *to_uio_pci_generic_dev(struct uio_info *info){ return container_of(info, struct uio_pci_generic_dev, info);}static int release(struct uio_info *info, struct inode *inode){ struct uio_pci_generic_dev *gdev = to_uio_pci_generic_dev(info); /* * This driver is insecure when used with devices doing DMA, but some * people (mis)use it with such devices. * Let's at least make sure DMA isn't left enabled after the userspace * driver closes the fd. * Note that there's a non-zero chance doing this will wedge the device * at least until reset. */ pci_clear_master(gdev->pdev); return 0;}/* Interrupt handler. Read/modify/write the command register to disable * the interrupt. */static irqreturn_t irqhandler(int irq, struct uio_info *info){ struct uio_pci_generic_dev *gdev = to_uio_pci_generic_dev(info);