implemented initial ioctl framework and empty device database

device-db.h

@@ -0,0 +1,24 @@
+/*
+Vendor Reset - Vendor Specific Reset
+Copyright (C) 2020 Geoffrey McRae <geoff@hostfission.com>
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; either version 2 of the License, or (at your option) any later
+version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+static struct vendor_reset_device vendor_reset_devices[] =
+{
+  {
+    .type = VENDOR_RESET_TYPE_INVALID
+  }
+};

include/vendor-reset.h

@@ -0,0 +1,40 @@
+/*
+Vendor Reset - Vendor Specific Reset
+Copyright (C) 2020 Geoffrey McRae <geoff@hostfission.com>
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; either version 2 of the License, or (at your option) any later
+version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#ifndef _H_VENDOR_RESET_IOCTL
+#define _H_VENDOR_RESET_IOCTL
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+#define VENDOR_RESET_MAGIC 'r'
+
+#define VENDOR_RESET_TYPE_PCI 0x1
+#define VENDOR_RESET_TYPE_USB 0x2
+
+struct vendor_reset_ioctl
+{
+  int type;
+  int domain;
+  int bus;
+  int devfn;
+};
+
+#define VENDOR_RESET_RESET _IOW(VENDOR_RESET_MAGIC, 1, struct vendor_reset_ioctl)
+
+#endif

vendor-reset.c

@@ -15,3 +15,106 @@ You should have received a copy of the GNU General Public License along with
 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 Place, Suite 330, Boston, MA 02111-1307 USA
 */
+
+#include <linux/module.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/highmem.h>
+#include <linux/pci.h>
+
+#include "vendor-reset.h"
+#include "include/vendor-reset.h"
+
+#include "device-db.h"
+
+#define VENDOR_RESET_DEVNAME "vendor_reset"
+
+static long vendor_reset_ioctl_reset(struct file * filp, unsigned long arg)
+{
+  struct vendor_reset_ioctl dev;
+  struct vendor_reset_device *entry = vendor_reset_devices;
+  struct pci_dev * pcidev;
+  int ret;
+
+  if (copy_from_user(&dev, (void __user *)arg, sizeof(dev)))
+    return -EFAULT;
+
+  pcidev = pci_get_domain_bus_and_slot(dev.domain, dev.bus, dev.devfn);
+  if (!pcidev)
+    return -ENODEV;
+
+  while(entry->type != VENDOR_RESET_TYPE_INVALID)
+  {
+    if (entry->type != VENDOR_RESET_TYPE_PCI || entry->vendor != pcidev->vendor)
+      continue;
+
+    if (entry->device == VENDOR_RESET_DEVICE_ALL ||
+        entry->device == pcidev->device)
+      break;
+
+    ++entry;
+  }
+
+  if (entry->type == VENDOR_RESET_TYPE_INVALID)
+  {
+    ret = -ENODEV;
+    goto err;
+  }
+
+  ret = entry->ops.reset(pcidev);
+
+err:
+  pci_dev_put(pcidev);
+  return ret;
+}
+
+static long vendor_reset_ioctl(struct file * filp, unsigned int ioctl,
+    unsigned long arg)
+{
+  long ret;
+
+  switch(ioctl)
+  {
+    case VENDOR_RESET_RESET:
+      ret = vendor_reset_ioctl_reset(filp, arg);
+      break;
+
+    default:
+      ret = -ENOTTY;
+      break;
+  }
+
+  return ret;
+}
+
+static const struct file_operations vendor_reset_fops =
+{
+  .owner          = THIS_MODULE,
+  .unlocked_ioctl = vendor_reset_ioctl,
+#ifdef CONFIG_COMPAT
+  .compat_ioctl   = vendor_reset_ioctl,
+#endif
+};
+
+static struct miscdevice vendor_reset_misc =
+{
+  .minor = MISC_DYNAMIC_MINOR,
+  .name  = VENDOR_RESET_DEVNAME,
+  .fops  = &vendor_reset_fops
+};
+
+static int __init vendor_reset_init(void)
+{
+  return misc_register(&vendor_reset_misc);
+}
+
+static void __exit vendor_reset_exit(void)
+{
+  misc_deregister(&vendor_reset_misc);
+}
+
+module_init(vendor_reset_init);
+module_exit(vendor_reset_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Geoffrey McRae <geoff@hostfission.com>");

vendor-reset.h

@@ -0,0 +1,51 @@
+/*
+Vendor Reset - Vendor Specific Reset
+Copyright (C) 2020 Geoffrey McRae <geoff@hostfission.com>
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; either version 2 of the License, or (at your option) any later
+version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#ifndef _H_VENDOR_RESET
+#define _H_VENDOR_RESET
+
+#define VENDOR_RESET_TYPE_INVALID 0x0
+#define VENDOR_RESET_TYPE_PCI     0x1
+
+#define VENDOR_RESET_DEVICE_ALL ((unsigned int)-1)
+
+#include <linux/pci.h>
+
+struct vendor_reset_ops
+{
+  /* the reset method for the device at the specified address */
+  int (*reset)(struct pci_dev *dev);
+};
+
+struct vendor_reset_device
+{
+  /* one of VENDOR_RESET_TYPE_* */
+  unsigned int type;
+
+  /* the vendor ID */
+  unsigned int vendor;
+
+  /* the device ID or VENDOR_RESET_DEVICE_ALL to match all devices for the
+   * vendor */
+  unsigned int device;
+
+  /* the reset operations */
+  struct vendor_reset_ops ops;
+};
+
+#endif