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/* file.c
*
* Copyright © 2010 - 2013 UNISYS CORPORATION
* All rights reserved.
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*/
/* This contains the implementation that allows a usermode program to
* communicate with the visorchipset driver using a device/file interface.
*/
#include "globals.h"
#include "visorchannel.h"
#include <linux/mm.h>
#include <linux/fs.h>
#include "uisutils.h"
#define CURRENT_FILE_PC VISOR_CHIPSET_PC_file_c
static struct cdev Cdev;
static VISORCHANNEL **PControlVm_channel;
static dev_t MajorDev = -1; /**< indicates major num for device */
static BOOL Registered = FALSE;
static int visorchipset_open(struct inode *inode, struct file *file);
static int visorchipset_release(struct inode *inode, struct file *file);
static int visorchipset_mmap(struct file *file, struct vm_area_struct *vma);
#ifdef HAVE_UNLOCKED_IOCTL
long visorchipset_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
#else
int visorchipset_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg);
#endif
static const struct file_operations visorchipset_fops = {
.owner = THIS_MODULE,
.open = visorchipset_open,
.read = NULL,
.write = NULL,
#ifdef HAVE_UNLOCKED_IOCTL
.unlocked_ioctl = visorchipset_ioctl,
#else
.ioctl = visorchipset_ioctl,
#endif
.release = visorchipset_release,
.mmap = visorchipset_mmap,
};
int
visorchipset_file_init(dev_t majorDev, VISORCHANNEL **pControlVm_channel)
{
int rc = -1;
PControlVm_channel = pControlVm_channel;
MajorDev = majorDev;
cdev_init(&Cdev, &visorchipset_fops);
Cdev.owner = THIS_MODULE;
if (MAJOR(MajorDev) == 0) {
/* dynamic major device number registration required */
if (alloc_chrdev_region(&MajorDev, 0, 1, MYDRVNAME) < 0) {
ERRDRV("Unable to allocate+register char device %s",
MYDRVNAME);
RETINT(-1);
}
Registered = TRUE;
INFODRV("New major number %d registered\n", MAJOR(MajorDev));
} else {
/* static major device number registration required */
if (register_chrdev_region(MajorDev, 1, MYDRVNAME) < 0) {
ERRDRV("Unable to register char device %s", MYDRVNAME);
RETINT(-1);
}
Registered = TRUE;
INFODRV("Static major number %d registered\n", MAJOR(MajorDev));
}
if (cdev_add(&Cdev, MKDEV(MAJOR(MajorDev), 0), 1) < 0)
FAIL("failed to create char device", -1);
INFODRV("Registered char device for %s (major=%d)",
MYDRVNAME, MAJOR(MajorDev));
RETINT(0);
Away:
return rc;
}
void
visorchipset_file_cleanup(void)
{
if (Cdev.ops != NULL)
cdev_del(&Cdev);
Cdev.ops = NULL;
if (Registered) {
if (MAJOR(MajorDev) >= 0) {
unregister_chrdev_region(MajorDev, 1);
MajorDev = MKDEV(0, 0);
}
Registered = FALSE;
}
}
static int
visorchipset_open(struct inode *inode, struct file *file)
{
unsigned minor_number = iminor(inode);
int rc = -ENODEV;
DEBUGDRV("%s", __func__);
if (minor_number != 0)
RETINT(-ENODEV);
file->private_data = NULL;
RETINT(0);
Away:
if (rc < 0)
ERRDRV("%s minor=%d failed", __func__, minor_number);
return rc;
}
static int
visorchipset_release(struct inode *inode, struct file *file)
{
int rc = -1;
DEBUGDRV("%s", __func__);
RETINT(0);
Away:
return rc;
}
static int
visorchipset_mmap(struct file *file, struct vm_area_struct *vma)
{
ulong physAddr = 0;
ulong offset = vma->vm_pgoff << PAGE_SHIFT;
GUEST_PHYSICAL_ADDRESS addr = 0;
/* sv_enable_dfp(); */
DEBUGDRV("%s", __func__);
if (offset & (PAGE_SIZE - 1)) {
ERRDRV("%s virtual address NOT page-aligned!", __func__);
return -ENXIO; /* need aligned offsets */
}
switch (offset) {
case VISORCHIPSET_MMAP_CONTROLCHANOFFSET:
vma->vm_flags |= VM_IO;
if (*PControlVm_channel == NULL) {
ERRDRV("%s no controlvm channel yet", __func__);
return -ENXIO;
}
visorchannel_read(*PControlVm_channel,
offsetof(ULTRA_CONTROLVM_CHANNEL_PROTOCOL,
gpControlChannel), &addr,
sizeof(addr));
if (addr == 0) {
ERRDRV("%s control channel address is 0", __func__);
return -ENXIO;
}
physAddr = (ulong) (addr);
DEBUGDRV("mapping physical address = 0x%lx", physAddr);
if (remap_pfn_range(vma, vma->vm_start,
physAddr >> PAGE_SHIFT,
vma->vm_end - vma->vm_start,
/*pgprot_noncached */
(vma->vm_page_prot))) {
ERRDRV("%s remap_pfn_range failed", __func__);
return -EAGAIN;
}
break;
default:
return -ENOSYS;
}
DEBUGDRV("%s success!", __func__);
return 0;
}
#ifdef HAVE_UNLOCKED_IOCTL
long
visorchipset_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
#else
int
visorchipset_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
#endif
{
int rc = SUCCESS;
S64 adjustment;
S64 vrtc_offset;
DBGINF("entered visorchipset_ioctl, cmd=%d", cmd);
switch (cmd) {
case VMCALL_QUERY_GUEST_VIRTUAL_TIME_OFFSET:
/* get the physical rtc offset */
vrtc_offset = Issue_VMCALL_QUERY_GUEST_VIRTUAL_TIME_OFFSET();
if (copy_to_user
((void __user *)arg, &vrtc_offset, sizeof(vrtc_offset)))
RETINT(-EFAULT);
DBGINF("insde visorchipset_ioctl, cmd=%d, vrtc_offset=%lld",
cmd, vrtc_offset);
break;
case VMCALL_UPDATE_PHYSICAL_TIME:
if (copy_from_user
(&adjustment, (void __user *)arg, sizeof(adjustment)))
RETINT(-EFAULT);
DBGINF("insde visorchipset_ioctl, cmd=%d, adjustment=%lld", cmd,
adjustment);
rc = Issue_VMCALL_UPDATE_PHYSICAL_TIME(adjustment);
break;
default:
LOGERR("visorchipset_ioctl received invalid command");
RETINT(-EFAULT);
break;
}
RETINT(rc);
Away:
DBGINF("exiting %d!", rc);
return rc;
}
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