3 * Copyright (C) 2010 - 2013 UNISYS CORPORATION
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
14 * NON INFRINGEMENT. See the GNU General Public License for more
18 /* This contains the implementation that allows a usermode program to
19 * communicate with the visorchipset driver using a device/file interface.
23 #include "visorchannel.h"
29 #define CURRENT_FILE_PC VISOR_CHIPSET_PC_file_c
31 static struct cdev Cdev;
32 static VISORCHANNEL **PControlVm_channel;
33 static dev_t MajorDev = -1; /**< indicates major num for device */
34 static BOOL Registered = FALSE;
36 static int visorchipset_open(struct inode *inode, struct file *file);
37 static int visorchipset_release(struct inode *inode, struct file *file);
38 static int visorchipset_mmap(struct file *file, struct vm_area_struct *vma);
39 #ifdef HAVE_UNLOCKED_IOCTL
40 long visorchipset_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
42 int visorchipset_ioctl(struct inode *inode, struct file *file,
43 unsigned int cmd, unsigned long arg);
46 static const struct file_operations visorchipset_fops = {
48 .open = visorchipset_open,
51 #ifdef HAVE_UNLOCKED_IOCTL
52 .unlocked_ioctl = visorchipset_ioctl,
54 .ioctl = visorchipset_ioctl,
56 .release = visorchipset_release,
57 .mmap = visorchipset_mmap,
61 visorchipset_file_init(dev_t majorDev, VISORCHANNEL **pControlVm_channel)
65 PControlVm_channel = pControlVm_channel;
67 cdev_init(&Cdev, &visorchipset_fops);
68 Cdev.owner = THIS_MODULE;
69 if (MAJOR(MajorDev) == 0) {
70 /* dynamic major device number registration required */
71 if (alloc_chrdev_region(&MajorDev, 0, 1, MYDRVNAME) < 0) {
72 ERRDRV("Unable to allocate+register char device %s",
77 INFODRV("New major number %d registered\n", MAJOR(MajorDev));
79 /* static major device number registration required */
80 if (register_chrdev_region(MajorDev, 1, MYDRVNAME) < 0) {
81 ERRDRV("Unable to register char device %s", MYDRVNAME);
85 INFODRV("Static major number %d registered\n", MAJOR(MajorDev));
87 if (cdev_add(&Cdev, MKDEV(MAJOR(MajorDev), 0), 1) < 0) {
88 ERRDRV("failed to create char device: (status=%d)\n", rc);
91 INFODRV("Registered char device for %s (major=%d)",
92 MYDRVNAME, MAJOR(MajorDev));
99 visorchipset_file_cleanup(void)
101 if (Cdev.ops != NULL)
105 if (MAJOR(MajorDev) >= 0) {
106 unregister_chrdev_region(MajorDev, 1);
107 MajorDev = MKDEV(0, 0);
114 visorchipset_open(struct inode *inode, struct file *file)
116 unsigned minor_number = iminor(inode);
119 DEBUGDRV("%s", __func__);
120 if (minor_number != 0)
122 file->private_data = NULL;
126 ERRDRV("%s minor=%d failed", __func__, minor_number);
131 visorchipset_release(struct inode *inode, struct file *file)
133 DEBUGDRV("%s", __func__);
138 visorchipset_mmap(struct file *file, struct vm_area_struct *vma)
141 ulong offset = vma->vm_pgoff << PAGE_SHIFT;
142 GUEST_PHYSICAL_ADDRESS addr = 0;
144 /* sv_enable_dfp(); */
145 DEBUGDRV("%s", __func__);
146 if (offset & (PAGE_SIZE - 1)) {
147 ERRDRV("%s virtual address NOT page-aligned!", __func__);
148 return -ENXIO; /* need aligned offsets */
151 case VISORCHIPSET_MMAP_CONTROLCHANOFFSET:
152 vma->vm_flags |= VM_IO;
153 if (*PControlVm_channel == NULL) {
154 ERRDRV("%s no controlvm channel yet", __func__);
157 visorchannel_read(*PControlVm_channel,
158 offsetof(ULTRA_CONTROLVM_CHANNEL_PROTOCOL,
159 gpControlChannel), &addr,
162 ERRDRV("%s control channel address is 0", __func__);
165 physAddr = (ulong) (addr);
166 DEBUGDRV("mapping physical address = 0x%lx", physAddr);
167 if (remap_pfn_range(vma, vma->vm_start,
168 physAddr >> PAGE_SHIFT,
169 vma->vm_end - vma->vm_start,
170 /*pgprot_noncached */
171 (vma->vm_page_prot))) {
172 ERRDRV("%s remap_pfn_range failed", __func__);
179 DEBUGDRV("%s success!", __func__);
183 #ifdef HAVE_UNLOCKED_IOCTL
185 visorchipset_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
188 visorchipset_ioctl(struct inode *inode, struct file *file,
189 unsigned int cmd, unsigned long arg)
195 DBGINF("entered visorchipset_ioctl, cmd=%d", cmd);
197 case VMCALL_QUERY_GUEST_VIRTUAL_TIME_OFFSET:
198 /* get the physical rtc offset */
199 vrtc_offset = Issue_VMCALL_QUERY_GUEST_VIRTUAL_TIME_OFFSET();
201 ((void __user *)arg, &vrtc_offset, sizeof(vrtc_offset))) {
205 DBGINF("insde visorchipset_ioctl, cmd=%d, vrtc_offset=%lld",
208 case VMCALL_UPDATE_PHYSICAL_TIME:
210 (&adjustment, (void __user *)arg, sizeof(adjustment))) {
214 DBGINF("insde visorchipset_ioctl, cmd=%d, adjustment=%lld", cmd,
216 rc = Issue_VMCALL_UPDATE_PHYSICAL_TIME(adjustment);
219 LOGERR("visorchipset_ioctl received invalid command");
224 DBGINF("exiting %d!", rc);