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/*
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Vendor Reset - Vendor Specific Reset
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Copyright (C) 2020 Geoffrey McRae <geoff@hostfission.com>
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Copyright (C) 2020 Adam Madsen <adam@ajmadsen.com>
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/miscdevice.h>
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#include <linux/fs.h>
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#include <linux/highmem.h>
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#include <linux/pci.h>
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#include "vendor-reset-dev.h"
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#include "vendor-reset.h"
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#include "device-db.h"
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#define VENDOR_RESET_DEVNAME "vendor_reset"
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static long vendor_reset_ioctl_reset(struct file * filp, unsigned long arg)
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{
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struct vendor_reset_ioctl dev;
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struct vendor_reset_cfg *entry = vendor_reset_devices;
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struct pci_dev * pcidev;
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int ret;
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struct vendor_reset_dev vdev;
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if (copy_from_user(&dev, (void __user *)arg, sizeof(dev)))
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return -EFAULT;
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pcidev = pci_get_domain_bus_and_slot(dev.domain, dev.bus, dev.devfn);
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if (!pcidev)
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return -ENODEV;
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pci_info(pcidev, "Found device\n");
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for(entry = vendor_reset_devices; entry->vendor; ++entry)
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{
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if (entry->vendor != pcidev->vendor)
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continue;
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if (entry->device == VENDOR_RESET_DEVICE_ALL ||
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entry->device == pcidev->device)
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break;
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}
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if (!entry->vendor)
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{
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ret = -EOPNOTSUPP;
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goto err;
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}
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vdev.pdev = pcidev;
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/* we probably always want to lock the device */
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if (!pci_cfg_access_trylock(pcidev))
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{
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pci_warn(pcidev, "Could not acquire cfg lock\n");
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ret = -EAGAIN;
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goto err;
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}
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else
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{
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if (!device_trylock(&pcidev->dev))
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{
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pci_warn(pcidev, "Could not acquire device lock\n");
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pci_cfg_access_unlock(pcidev);
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ret = -EAGAIN;
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goto err;
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}
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}
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pci_info(pcidev, "Acquired lock\n");
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if (entry->ops->pre_reset)
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{
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ret = entry->ops->pre_reset(&vdev);
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if (ret)
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goto unlock;
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}
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/* expose return code to cleanup */
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ret = vdev.reset_ret = entry->ops->reset(&vdev);
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if (ret)
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pci_warn(pcidev, "Failed to reset device\n");
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if (entry->ops->post_reset)
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ret = entry->ops->post_reset(&vdev);
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unlock:
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device_unlock(&pcidev->dev);
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pci_cfg_access_unlock(pcidev);
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err:
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pci_dev_put(pcidev);
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return ret;
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}
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static long vendor_reset_ioctl(struct file * filp, unsigned int ioctl,
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unsigned long arg)
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{
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long ret;
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switch(ioctl)
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{
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case VENDOR_RESET_RESET:
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ret = vendor_reset_ioctl_reset(filp, arg);
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break;
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default:
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ret = -ENOTTY;
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break;
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}
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return ret;
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}
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static const struct file_operations vendor_reset_fops =
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{
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.owner = THIS_MODULE,
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.unlocked_ioctl = vendor_reset_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = vendor_reset_ioctl,
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#endif
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};
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static struct miscdevice vendor_reset_misc =
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{
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.minor = MISC_DYNAMIC_MINOR,
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.name = VENDOR_RESET_DEVNAME,
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.fops = &vendor_reset_fops
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};
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static int __init vendor_reset_init(void)
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{
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return misc_register(&vendor_reset_misc);
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}
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static void __exit vendor_reset_exit(void)
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{
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misc_deregister(&vendor_reset_misc);
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}
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module_init(vendor_reset_init);
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module_exit(vendor_reset_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Geoffrey McRae <geoff@hostfission.com>");
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