From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/drivers/uio/uio_pci_generic.c | 128 +++++++++++++++++++++++++++++++++++ 1 file changed, 128 insertions(+) create mode 100644 kernel/drivers/uio/uio_pci_generic.c (limited to 'kernel/drivers/uio/uio_pci_generic.c') diff --git a/kernel/drivers/uio/uio_pci_generic.c b/kernel/drivers/uio/uio_pci_generic.c new file mode 100644 index 000000000..d0b508b68 --- /dev/null +++ b/kernel/drivers/uio/uio_pci_generic.c @@ -0,0 +1,128 @@ +/* uio_pci_generic - generic UIO driver for PCI 2.3 devices + * + * Copyright (C) 2009 Red Hat, Inc. + * Author: Michael S. Tsirkin + * + * 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 +#include +#include +#include +#include + +#define DRIVER_VERSION "0.01.0" +#define DRIVER_AUTHOR "Michael S. Tsirkin " +#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); -- cgit 1.2.3-korg