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