LookingGlass/module/kvmfr.c

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/*
UIO KVMFR Driver
2019-02-22 11:16:14 +00:00
Copyright (C) 2017-2019 Geoffrey McRae <geoff@hostfission.com>
https://looking-glass.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
*/
#define PCI_KVMFR_VENDOR_ID 0x1af4 //Red Hat Inc,
#define PCI_KVMFR_DEVICE_ID 0x1110 //Inter-VM shared memory
#include <linux/device.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/uio_driver.h>
#include <asm/io.h>
static int kvmfr_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
struct uio_info *info;
info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
if (pci_enable_device(dev))
goto out_free;
if (pci_request_regions(dev, "kvmfr"))
goto out_disable;
info->mem[0].addr = pci_resource_start(dev, 2);
if (!info->mem[0].addr)
goto out_release;
info->mem[0].internal_addr = ioremap_wt(
pci_resource_start(dev, 2),
pci_resource_len (dev, 2)
);
if (!info->mem[0].internal_addr)
goto out_release;
info->mem[0].size = pci_resource_len(dev, 2);
info->mem[0].memtype = UIO_MEM_PHYS;
info->name = "KVMFR";
info->version = "0.0.1";
info->irq = 0;
info->irq_flags = 0;
info->handler = NULL;
if (uio_register_device(&dev->dev, info))
goto out_unmap;
pci_set_drvdata(dev, info);
return 0;
out_unmap:
printk("unmap\n");
iounmap(info->mem[0].internal_addr);
out_release:
printk("release\n");
pci_release_regions(dev);
out_disable:
printk("disable\n");
pci_disable_device(dev);
out_free:
printk("free\n");
kfree(info);
return -ENODEV;
}
static void kvmfr_pci_remove(struct pci_dev *dev)
{
struct uio_info *info = pci_get_drvdata(dev);
uio_unregister_device(info);
pci_release_regions(dev);
pci_disable_device(dev);
iounmap(info->mem[0].internal_addr);
kfree(info);
}
static struct pci_device_id kvmfr_pci_ids[] =
{
{
.vendor = PCI_KVMFR_VENDOR_ID,
.device = PCI_KVMFR_DEVICE_ID,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID
},
{ 0, }
};
static struct pci_driver kvmfr_pci_driver =
{
.name = "kvmfr",
.id_table = kvmfr_pci_ids,
.probe = kvmfr_pci_probe,
.remove = kvmfr_pci_remove
};
module_pci_driver(kvmfr_pci_driver);
MODULE_DEVICE_TABLE(pci, kvmfr_pci_ids);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Geoffrey McRae");