/* uio_pci_generic - generic UIO driver for PCI 2.3 devices * * Copyright (C) 2009 Red Hat, Inc. * Author: Michael S. Tsirkin <mst@redhat.com> * * This work is licensed under the terms of the GNU GPL, version 2. * * 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. */ #include <linux/device.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/slab.h> #include <linux/uio_driver.h> #define DRIVER_VERSION "0.01.0" #define DRIVER_AUTHOR "Michael S. Tsirkin <mst@redhat.com>" #define DRIVER_DESC "Generic UIO driver for PCI 2.3 devices" 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); } /* 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); if (!pci_check_and_mask_intx(gdev->pdev)) return IRQ_NONE; /* UIO core will signal the user process. */ return IRQ_HANDLED; } static int probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct uio_pci_generic_dev *gdev; int err; err = pci_enable_device(pdev); if (err) { dev_err(&pdev->dev, "%s: pci_enable_device failed: %d\n", __func__, err); return err; } if (!pdev->irq) { dev_warn(&pdev->dev, "No IRQ assigned to device: " "no support for interrupts?\n"); pci_disable_device(pdev); return -ENODEV; } if (!pci_intx_mask_supported(pdev)) { err = -ENODEV; goto err_verify; } gdev = kzalloc(sizeof(struct uio_pci_generic_dev), GFP_KERNEL); if (!gdev) { err = -ENOMEM; goto err_alloc; } gdev->info.name = "uio_pci_generic"; gdev->info.version = DRIVER_VERSION; gdev->info.irq = pdev->irq; gdev->info.irq_flags = IRQF_SHARED; gdev->info.handler = irqhandler; gdev->pdev = pdev; err = uio_register_device(&pdev->dev, &gdev->info); if (err) goto err_register; pci_set_drvdata(pdev, gdev); return 0; err_register: kfree(gdev); err_alloc: err_verify: pci_disable_device(pdev); return err; } static void remove(struct pci_dev *pdev) { struct uio_pci_generic_dev *gdev = pci_get_drvdata(pdev); uio_unregister_device(&gdev->info); pci_disable_device(pdev); kfree(gdev); } static struct pci_driver uio_pci_driver = { .name = "uio_pci_generic", .id_table = NULL, /* only dynamic id's */ .probe = probe, .remove = remove, }; module_pci_driver(uio_pci_driver); MODULE_VERSION(DRIVER_VERSION); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_DESCRIPTION(DRIVER_DESC); tools/testing/selftests?h=nds-private-remove&id=71810db27c1c853b335675bee335d893bc3d324b'>selftests</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/testing/selftests/nsfs?h=nds-private-remove&id=71810db27c1c853b335675bee335d893bc3d324b'>nsfs</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/tools/testing/selftests/nsfs?h=nds-private-remove&id=71810db27c1c853b335675bee335d893bc3d324b&showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>