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![Alex Williamson](/assets/img/avatar_default.png)
We always need to call put_device() if device_register() fails. All vfio drivers calling device_register() include a similar unwind stack via gotos, therefore split device_unregister() into its device_del() and put_device() components in the unwind path, and add a goto target to handle only the put_device() requirement. Reported-by: Ruan Jinjie <ruanjinjie@huawei.com> Link: https://lore.kernel.org/all/20221118032827.3725190-1-ruanjinjie@huawei.com Fixes:d61fc96f47
("sample: vfio mdev display - host device") Fixes:9d1a546c53
("docs: Sample driver to demonstrate how to use Mediated device framework.") Fixes:a5e6e6505f
("sample: vfio bochs vbe display (host device for bochs-drm)") Fixes:9e6f07cd1e
("vfio/ccw: create a parent struct") Fixes:36360658eb
("s390: vfio_ap: link the vfio_ap devices to the vfio_ap bus subsystem") Cc: Tony Krowiak <akrowiak@linux.ibm.com> Cc: Halil Pasic <pasic@linux.ibm.com> Cc: Jason Herne <jjherne@linux.ibm.com> Cc: Kirti Wankhede <kwankhede@nvidia.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Eric Farman <farman@linux.ibm.com> Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com> Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com> Link: https://lore.kernel.org/r/166999942139.645727.12439756512449846442.stgit@omen Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
760 lines
18 KiB
C
760 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Mediated virtual PCI display host device driver
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*
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* See mdpy-defs.h for device specs
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*
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* (c) Gerd Hoffmann <kraxel@redhat.com>
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*
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* based on mtty driver which is:
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* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
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* Author: Neo Jia <cjia@nvidia.com>
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* Kirti Wankhede <kwankhede@nvidia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/cdev.h>
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#include <linux/vfio.h>
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#include <linux/iommu.h>
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#include <linux/sysfs.h>
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#include <linux/mdev.h>
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#include <linux/pci.h>
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#include <drm/drm_fourcc.h>
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#include "mdpy-defs.h"
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#define MDPY_NAME "mdpy"
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#define MDPY_CLASS_NAME "mdpy"
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#define MDPY_CONFIG_SPACE_SIZE 0xff
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#define MDPY_MEMORY_BAR_OFFSET PAGE_SIZE
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#define MDPY_DISPLAY_REGION 16
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#define STORE_LE16(addr, val) (*(u16 *)addr = val)
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#define STORE_LE32(addr, val) (*(u32 *)addr = val)
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MODULE_LICENSE("GPL v2");
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#define MDPY_TYPE_1 "vga"
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#define MDPY_TYPE_2 "xga"
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#define MDPY_TYPE_3 "hd"
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static struct mdpy_type {
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struct mdev_type type;
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u32 format;
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u32 bytepp;
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u32 width;
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u32 height;
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} mdpy_types[] = {
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{
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.type.sysfs_name = MDPY_TYPE_1,
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.type.pretty_name = MDPY_CLASS_NAME "-" MDPY_TYPE_1,
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.format = DRM_FORMAT_XRGB8888,
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.bytepp = 4,
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.width = 640,
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.height = 480,
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}, {
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.type.sysfs_name = MDPY_TYPE_2,
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.type.pretty_name = MDPY_CLASS_NAME "-" MDPY_TYPE_2,
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.format = DRM_FORMAT_XRGB8888,
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.bytepp = 4,
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.width = 1024,
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.height = 768,
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}, {
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.type.sysfs_name = MDPY_TYPE_3,
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.type.pretty_name = MDPY_CLASS_NAME "-" MDPY_TYPE_3,
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.format = DRM_FORMAT_XRGB8888,
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.bytepp = 4,
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.width = 1920,
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.height = 1080,
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},
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};
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static struct mdev_type *mdpy_mdev_types[] = {
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&mdpy_types[0].type,
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&mdpy_types[1].type,
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&mdpy_types[2].type,
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};
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static dev_t mdpy_devt;
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static struct class *mdpy_class;
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static struct cdev mdpy_cdev;
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static struct device mdpy_dev;
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static struct mdev_parent mdpy_parent;
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static const struct vfio_device_ops mdpy_dev_ops;
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/* State of each mdev device */
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struct mdev_state {
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struct vfio_device vdev;
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u8 *vconfig;
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u32 bar_mask;
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struct mutex ops_lock;
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struct mdev_device *mdev;
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struct vfio_device_info dev_info;
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const struct mdpy_type *type;
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u32 memsize;
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void *memblk;
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};
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static void mdpy_create_config_space(struct mdev_state *mdev_state)
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{
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STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID],
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MDPY_PCI_VENDOR_ID);
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STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID],
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MDPY_PCI_DEVICE_ID);
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STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID],
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MDPY_PCI_SUBVENDOR_ID);
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STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID],
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MDPY_PCI_SUBDEVICE_ID);
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STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND],
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PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
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STORE_LE16((u16 *) &mdev_state->vconfig[PCI_STATUS],
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PCI_STATUS_CAP_LIST);
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STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE],
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PCI_CLASS_DISPLAY_OTHER);
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mdev_state->vconfig[PCI_CLASS_REVISION] = 0x01;
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STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0],
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PCI_BASE_ADDRESS_SPACE_MEMORY |
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PCI_BASE_ADDRESS_MEM_TYPE_32 |
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PCI_BASE_ADDRESS_MEM_PREFETCH);
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mdev_state->bar_mask = ~(mdev_state->memsize) + 1;
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/* vendor specific capability for the config registers */
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mdev_state->vconfig[PCI_CAPABILITY_LIST] = MDPY_VENDORCAP_OFFSET;
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mdev_state->vconfig[MDPY_VENDORCAP_OFFSET + 0] = 0x09; /* vendor cap */
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mdev_state->vconfig[MDPY_VENDORCAP_OFFSET + 1] = 0x00; /* next ptr */
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mdev_state->vconfig[MDPY_VENDORCAP_OFFSET + 2] = MDPY_VENDORCAP_SIZE;
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STORE_LE32((u32 *) &mdev_state->vconfig[MDPY_FORMAT_OFFSET],
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mdev_state->type->format);
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STORE_LE32((u32 *) &mdev_state->vconfig[MDPY_WIDTH_OFFSET],
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mdev_state->type->width);
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STORE_LE32((u32 *) &mdev_state->vconfig[MDPY_HEIGHT_OFFSET],
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mdev_state->type->height);
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}
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static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset,
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char *buf, u32 count)
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{
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struct device *dev = mdev_dev(mdev_state->mdev);
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u32 cfg_addr;
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switch (offset) {
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case PCI_BASE_ADDRESS_0:
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cfg_addr = *(u32 *)buf;
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if (cfg_addr == 0xffffffff) {
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cfg_addr = (cfg_addr & mdev_state->bar_mask);
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} else {
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cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK;
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if (cfg_addr)
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dev_info(dev, "BAR0 @ 0x%x\n", cfg_addr);
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}
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cfg_addr |= (mdev_state->vconfig[offset] &
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~PCI_BASE_ADDRESS_MEM_MASK);
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STORE_LE32(&mdev_state->vconfig[offset], cfg_addr);
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break;
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}
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}
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static ssize_t mdev_access(struct mdev_state *mdev_state, char *buf,
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size_t count, loff_t pos, bool is_write)
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{
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int ret = 0;
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mutex_lock(&mdev_state->ops_lock);
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if (pos < MDPY_CONFIG_SPACE_SIZE) {
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if (is_write)
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handle_pci_cfg_write(mdev_state, pos, buf, count);
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else
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memcpy(buf, (mdev_state->vconfig + pos), count);
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} else if ((pos >= MDPY_MEMORY_BAR_OFFSET) &&
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(pos + count <=
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MDPY_MEMORY_BAR_OFFSET + mdev_state->memsize)) {
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pos -= MDPY_MEMORY_BAR_OFFSET;
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if (is_write)
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memcpy(mdev_state->memblk, buf, count);
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else
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memcpy(buf, mdev_state->memblk, count);
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} else {
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dev_info(mdev_state->vdev.dev,
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"%s: %s @0x%llx (unhandled)\n", __func__,
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is_write ? "WR" : "RD", pos);
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ret = -1;
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goto accessfailed;
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}
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ret = count;
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accessfailed:
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mutex_unlock(&mdev_state->ops_lock);
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return ret;
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}
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static int mdpy_reset(struct mdev_state *mdev_state)
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{
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u32 stride, i;
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/* initialize with gray gradient */
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stride = mdev_state->type->width * mdev_state->type->bytepp;
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for (i = 0; i < mdev_state->type->height; i++)
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memset(mdev_state->memblk + i * stride,
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i * 255 / mdev_state->type->height,
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stride);
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return 0;
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}
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static int mdpy_init_dev(struct vfio_device *vdev)
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{
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struct mdev_state *mdev_state =
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container_of(vdev, struct mdev_state, vdev);
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struct mdev_device *mdev = to_mdev_device(vdev->dev);
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const struct mdpy_type *type =
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container_of(mdev->type, struct mdpy_type, type);
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u32 fbsize;
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int ret = -ENOMEM;
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mdev_state->vconfig = kzalloc(MDPY_CONFIG_SPACE_SIZE, GFP_KERNEL);
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if (!mdev_state->vconfig)
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return ret;
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fbsize = roundup_pow_of_two(type->width * type->height * type->bytepp);
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mdev_state->memblk = vmalloc_user(fbsize);
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if (!mdev_state->memblk)
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goto out_vconfig;
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mutex_init(&mdev_state->ops_lock);
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mdev_state->mdev = mdev;
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mdev_state->type = type;
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mdev_state->memsize = fbsize;
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mdpy_create_config_space(mdev_state);
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mdpy_reset(mdev_state);
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dev_info(vdev->dev, "%s: %s (%dx%d)\n", __func__, type->type.pretty_name,
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type->width, type->height);
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return 0;
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out_vconfig:
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kfree(mdev_state->vconfig);
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return ret;
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}
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static int mdpy_probe(struct mdev_device *mdev)
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{
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struct mdev_state *mdev_state;
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int ret;
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mdev_state = vfio_alloc_device(mdev_state, vdev, &mdev->dev,
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&mdpy_dev_ops);
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if (IS_ERR(mdev_state))
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return PTR_ERR(mdev_state);
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ret = vfio_register_emulated_iommu_dev(&mdev_state->vdev);
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if (ret)
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goto err_put_vdev;
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dev_set_drvdata(&mdev->dev, mdev_state);
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return 0;
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err_put_vdev:
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vfio_put_device(&mdev_state->vdev);
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return ret;
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}
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static void mdpy_release_dev(struct vfio_device *vdev)
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{
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struct mdev_state *mdev_state =
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container_of(vdev, struct mdev_state, vdev);
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vfree(mdev_state->memblk);
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kfree(mdev_state->vconfig);
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}
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static void mdpy_remove(struct mdev_device *mdev)
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{
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struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev);
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dev_info(&mdev->dev, "%s\n", __func__);
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vfio_unregister_group_dev(&mdev_state->vdev);
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vfio_put_device(&mdev_state->vdev);
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}
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static ssize_t mdpy_read(struct vfio_device *vdev, char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct mdev_state *mdev_state =
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container_of(vdev, struct mdev_state, vdev);
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unsigned int done = 0;
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int ret;
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while (count) {
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size_t filled;
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if (count >= 4 && !(*ppos % 4)) {
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u32 val;
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ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
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*ppos, false);
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if (ret <= 0)
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goto read_err;
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if (copy_to_user(buf, &val, sizeof(val)))
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goto read_err;
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filled = 4;
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} else if (count >= 2 && !(*ppos % 2)) {
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u16 val;
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ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
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*ppos, false);
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if (ret <= 0)
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goto read_err;
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if (copy_to_user(buf, &val, sizeof(val)))
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goto read_err;
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filled = 2;
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} else {
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u8 val;
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ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
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*ppos, false);
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if (ret <= 0)
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goto read_err;
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if (copy_to_user(buf, &val, sizeof(val)))
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goto read_err;
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filled = 1;
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}
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count -= filled;
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done += filled;
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*ppos += filled;
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buf += filled;
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}
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return done;
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read_err:
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return -EFAULT;
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}
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static ssize_t mdpy_write(struct vfio_device *vdev, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct mdev_state *mdev_state =
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container_of(vdev, struct mdev_state, vdev);
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unsigned int done = 0;
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int ret;
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while (count) {
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size_t filled;
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if (count >= 4 && !(*ppos % 4)) {
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u32 val;
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if (copy_from_user(&val, buf, sizeof(val)))
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goto write_err;
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ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
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*ppos, true);
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if (ret <= 0)
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goto write_err;
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filled = 4;
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} else if (count >= 2 && !(*ppos % 2)) {
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u16 val;
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if (copy_from_user(&val, buf, sizeof(val)))
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goto write_err;
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ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
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*ppos, true);
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if (ret <= 0)
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goto write_err;
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filled = 2;
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} else {
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u8 val;
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if (copy_from_user(&val, buf, sizeof(val)))
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goto write_err;
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ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
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*ppos, true);
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if (ret <= 0)
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goto write_err;
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filled = 1;
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}
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count -= filled;
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done += filled;
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*ppos += filled;
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buf += filled;
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}
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return done;
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write_err:
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return -EFAULT;
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}
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static int mdpy_mmap(struct vfio_device *vdev, struct vm_area_struct *vma)
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{
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struct mdev_state *mdev_state =
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container_of(vdev, struct mdev_state, vdev);
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if (vma->vm_pgoff != MDPY_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
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return -EINVAL;
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if (vma->vm_end < vma->vm_start)
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return -EINVAL;
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if (vma->vm_end - vma->vm_start > mdev_state->memsize)
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return -EINVAL;
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if ((vma->vm_flags & VM_SHARED) == 0)
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return -EINVAL;
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return remap_vmalloc_range(vma, mdev_state->memblk, 0);
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}
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static int mdpy_get_region_info(struct mdev_state *mdev_state,
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struct vfio_region_info *region_info,
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u16 *cap_type_id, void **cap_type)
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{
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if (region_info->index >= VFIO_PCI_NUM_REGIONS &&
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region_info->index != MDPY_DISPLAY_REGION)
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return -EINVAL;
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switch (region_info->index) {
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case VFIO_PCI_CONFIG_REGION_INDEX:
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region_info->offset = 0;
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region_info->size = MDPY_CONFIG_SPACE_SIZE;
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region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
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VFIO_REGION_INFO_FLAG_WRITE);
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break;
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case VFIO_PCI_BAR0_REGION_INDEX:
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case MDPY_DISPLAY_REGION:
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region_info->offset = MDPY_MEMORY_BAR_OFFSET;
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region_info->size = mdev_state->memsize;
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region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
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VFIO_REGION_INFO_FLAG_WRITE |
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VFIO_REGION_INFO_FLAG_MMAP);
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break;
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default:
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region_info->size = 0;
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region_info->offset = 0;
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region_info->flags = 0;
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}
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return 0;
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}
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static int mdpy_get_irq_info(struct vfio_irq_info *irq_info)
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{
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irq_info->count = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int mdpy_get_device_info(struct vfio_device_info *dev_info)
|
|
{
|
|
dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
|
|
dev_info->num_regions = VFIO_PCI_NUM_REGIONS;
|
|
dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
|
|
return 0;
|
|
}
|
|
|
|
static int mdpy_query_gfx_plane(struct mdev_state *mdev_state,
|
|
struct vfio_device_gfx_plane_info *plane)
|
|
{
|
|
if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) {
|
|
if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE |
|
|
VFIO_GFX_PLANE_TYPE_REGION))
|
|
return 0;
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (plane->flags != VFIO_GFX_PLANE_TYPE_REGION)
|
|
return -EINVAL;
|
|
|
|
plane->drm_format = mdev_state->type->format;
|
|
plane->width = mdev_state->type->width;
|
|
plane->height = mdev_state->type->height;
|
|
plane->stride = (mdev_state->type->width *
|
|
mdev_state->type->bytepp);
|
|
plane->size = mdev_state->memsize;
|
|
plane->region_index = MDPY_DISPLAY_REGION;
|
|
|
|
/* unused */
|
|
plane->drm_format_mod = 0;
|
|
plane->x_pos = 0;
|
|
plane->y_pos = 0;
|
|
plane->x_hot = 0;
|
|
plane->y_hot = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long mdpy_ioctl(struct vfio_device *vdev, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
int ret = 0;
|
|
unsigned long minsz;
|
|
struct mdev_state *mdev_state =
|
|
container_of(vdev, struct mdev_state, vdev);
|
|
|
|
switch (cmd) {
|
|
case VFIO_DEVICE_GET_INFO:
|
|
{
|
|
struct vfio_device_info info;
|
|
|
|
minsz = offsetofend(struct vfio_device_info, num_irqs);
|
|
|
|
if (copy_from_user(&info, (void __user *)arg, minsz))
|
|
return -EFAULT;
|
|
|
|
if (info.argsz < minsz)
|
|
return -EINVAL;
|
|
|
|
ret = mdpy_get_device_info(&info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
memcpy(&mdev_state->dev_info, &info, sizeof(info));
|
|
|
|
if (copy_to_user((void __user *)arg, &info, minsz))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
case VFIO_DEVICE_GET_REGION_INFO:
|
|
{
|
|
struct vfio_region_info info;
|
|
u16 cap_type_id = 0;
|
|
void *cap_type = NULL;
|
|
|
|
minsz = offsetofend(struct vfio_region_info, offset);
|
|
|
|
if (copy_from_user(&info, (void __user *)arg, minsz))
|
|
return -EFAULT;
|
|
|
|
if (info.argsz < minsz)
|
|
return -EINVAL;
|
|
|
|
ret = mdpy_get_region_info(mdev_state, &info, &cap_type_id,
|
|
&cap_type);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (copy_to_user((void __user *)arg, &info, minsz))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
case VFIO_DEVICE_GET_IRQ_INFO:
|
|
{
|
|
struct vfio_irq_info info;
|
|
|
|
minsz = offsetofend(struct vfio_irq_info, count);
|
|
|
|
if (copy_from_user(&info, (void __user *)arg, minsz))
|
|
return -EFAULT;
|
|
|
|
if ((info.argsz < minsz) ||
|
|
(info.index >= mdev_state->dev_info.num_irqs))
|
|
return -EINVAL;
|
|
|
|
ret = mdpy_get_irq_info(&info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (copy_to_user((void __user *)arg, &info, minsz))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
case VFIO_DEVICE_QUERY_GFX_PLANE:
|
|
{
|
|
struct vfio_device_gfx_plane_info plane;
|
|
|
|
minsz = offsetofend(struct vfio_device_gfx_plane_info,
|
|
region_index);
|
|
|
|
if (copy_from_user(&plane, (void __user *)arg, minsz))
|
|
return -EFAULT;
|
|
|
|
if (plane.argsz < minsz)
|
|
return -EINVAL;
|
|
|
|
ret = mdpy_query_gfx_plane(mdev_state, &plane);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (copy_to_user((void __user *)arg, &plane, minsz))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
case VFIO_DEVICE_SET_IRQS:
|
|
return -EINVAL;
|
|
|
|
case VFIO_DEVICE_RESET:
|
|
return mdpy_reset(mdev_state);
|
|
}
|
|
return -ENOTTY;
|
|
}
|
|
|
|
static ssize_t
|
|
resolution_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct mdev_state *mdev_state = dev_get_drvdata(dev);
|
|
|
|
return sprintf(buf, "%dx%d\n",
|
|
mdev_state->type->width,
|
|
mdev_state->type->height);
|
|
}
|
|
static DEVICE_ATTR_RO(resolution);
|
|
|
|
static struct attribute *mdev_dev_attrs[] = {
|
|
&dev_attr_resolution.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group mdev_dev_group = {
|
|
.name = "vendor",
|
|
.attrs = mdev_dev_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *mdev_dev_groups[] = {
|
|
&mdev_dev_group,
|
|
NULL,
|
|
};
|
|
|
|
static ssize_t mdpy_show_description(struct mdev_type *mtype, char *buf)
|
|
{
|
|
struct mdpy_type *type = container_of(mtype, struct mdpy_type, type);
|
|
|
|
return sprintf(buf, "virtual display, %dx%d framebuffer\n",
|
|
type->width, type->height);
|
|
}
|
|
|
|
static const struct vfio_device_ops mdpy_dev_ops = {
|
|
.init = mdpy_init_dev,
|
|
.release = mdpy_release_dev,
|
|
.read = mdpy_read,
|
|
.write = mdpy_write,
|
|
.ioctl = mdpy_ioctl,
|
|
.mmap = mdpy_mmap,
|
|
};
|
|
|
|
static struct mdev_driver mdpy_driver = {
|
|
.device_api = VFIO_DEVICE_API_PCI_STRING,
|
|
.max_instances = 4,
|
|
.driver = {
|
|
.name = "mdpy",
|
|
.owner = THIS_MODULE,
|
|
.mod_name = KBUILD_MODNAME,
|
|
.dev_groups = mdev_dev_groups,
|
|
},
|
|
.probe = mdpy_probe,
|
|
.remove = mdpy_remove,
|
|
.show_description = mdpy_show_description,
|
|
};
|
|
|
|
static const struct file_operations vd_fops = {
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static void mdpy_device_release(struct device *dev)
|
|
{
|
|
/* nothing */
|
|
}
|
|
|
|
static int __init mdpy_dev_init(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
ret = alloc_chrdev_region(&mdpy_devt, 0, MINORMASK + 1, MDPY_NAME);
|
|
if (ret < 0) {
|
|
pr_err("Error: failed to register mdpy_dev, err: %d\n", ret);
|
|
return ret;
|
|
}
|
|
cdev_init(&mdpy_cdev, &vd_fops);
|
|
cdev_add(&mdpy_cdev, mdpy_devt, MINORMASK + 1);
|
|
pr_info("%s: major %d\n", __func__, MAJOR(mdpy_devt));
|
|
|
|
ret = mdev_register_driver(&mdpy_driver);
|
|
if (ret)
|
|
goto err_cdev;
|
|
|
|
mdpy_class = class_create(THIS_MODULE, MDPY_CLASS_NAME);
|
|
if (IS_ERR(mdpy_class)) {
|
|
pr_err("Error: failed to register mdpy_dev class\n");
|
|
ret = PTR_ERR(mdpy_class);
|
|
goto err_driver;
|
|
}
|
|
mdpy_dev.class = mdpy_class;
|
|
mdpy_dev.release = mdpy_device_release;
|
|
dev_set_name(&mdpy_dev, "%s", MDPY_NAME);
|
|
|
|
ret = device_register(&mdpy_dev);
|
|
if (ret)
|
|
goto err_put;
|
|
|
|
ret = mdev_register_parent(&mdpy_parent, &mdpy_dev, &mdpy_driver,
|
|
mdpy_mdev_types,
|
|
ARRAY_SIZE(mdpy_mdev_types));
|
|
if (ret)
|
|
goto err_device;
|
|
|
|
return 0;
|
|
|
|
err_device:
|
|
device_del(&mdpy_dev);
|
|
err_put:
|
|
put_device(&mdpy_dev);
|
|
class_destroy(mdpy_class);
|
|
err_driver:
|
|
mdev_unregister_driver(&mdpy_driver);
|
|
err_cdev:
|
|
cdev_del(&mdpy_cdev);
|
|
unregister_chrdev_region(mdpy_devt, MINORMASK + 1);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit mdpy_dev_exit(void)
|
|
{
|
|
mdpy_dev.bus = NULL;
|
|
mdev_unregister_parent(&mdpy_parent);
|
|
|
|
device_unregister(&mdpy_dev);
|
|
mdev_unregister_driver(&mdpy_driver);
|
|
cdev_del(&mdpy_cdev);
|
|
unregister_chrdev_region(mdpy_devt, MINORMASK + 1);
|
|
class_destroy(mdpy_class);
|
|
mdpy_class = NULL;
|
|
}
|
|
|
|
module_param_named(count, mdpy_driver.max_instances, int, 0444);
|
|
MODULE_PARM_DESC(count, "number of " MDPY_NAME " devices");
|
|
|
|
module_init(mdpy_dev_init)
|
|
module_exit(mdpy_dev_exit)
|