adc9d1f6f5
The mdpy_types array is parallel to the supported_type_groups array, so the type_group_id indexes both. Instead of doing string searching just directly index with type_group_id in all places. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Message-Id: <13-v2-d36939638fc6+d54-vfio2_jgg@nvidia.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
798 lines
18 KiB
C
798 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/device.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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static int max_devices = 4;
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module_param_named(count, max_devices, int, 0444);
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MODULE_PARM_DESC(count, "number of " MDPY_NAME " devices");
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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 const struct mdpy_type {
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const char *name;
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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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.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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.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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.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 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 u32 mdpy_count;
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/* State of each mdev device */
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struct mdev_state {
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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_device *mdev, char *buf, size_t count,
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loff_t pos, bool is_write)
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{
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struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
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struct device *dev = mdev_dev(mdev);
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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(dev, "%s: %s @0x%llx (unhandled)\n",
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__func__, 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_device *mdev)
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{
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struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
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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_create(struct kobject *kobj, struct mdev_device *mdev)
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{
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const struct mdpy_type *type =
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&mdpy_types[mdev_get_type_group_id(mdev)];
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struct device *dev = mdev_dev(mdev);
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struct mdev_state *mdev_state;
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u32 fbsize;
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if (mdpy_count >= max_devices)
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return -ENOMEM;
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mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
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if (mdev_state == NULL)
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return -ENOMEM;
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mdev_state->vconfig = kzalloc(MDPY_CONFIG_SPACE_SIZE, GFP_KERNEL);
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if (mdev_state->vconfig == NULL) {
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kfree(mdev_state);
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return -ENOMEM;
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}
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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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kfree(mdev_state->vconfig);
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kfree(mdev_state);
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return -ENOMEM;
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}
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dev_info(dev, "%s: %s (%dx%d)\n", __func__, type->name, type->width,
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type->height);
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mutex_init(&mdev_state->ops_lock);
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mdev_state->mdev = mdev;
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mdev_set_drvdata(mdev, mdev_state);
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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);
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mdpy_count++;
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return 0;
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}
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static int mdpy_remove(struct mdev_device *mdev)
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{
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struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
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struct device *dev = mdev_dev(mdev);
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dev_info(dev, "%s\n", __func__);
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mdev_set_drvdata(mdev, NULL);
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vfree(mdev_state->memblk);
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kfree(mdev_state->vconfig);
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kfree(mdev_state);
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mdpy_count--;
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return 0;
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}
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static ssize_t mdpy_read(struct mdev_device *mdev, char __user *buf,
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size_t count, loff_t *ppos)
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{
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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, (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, (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, (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 mdev_device *mdev, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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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, (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, (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, (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 mdev_device *mdev, struct vm_area_struct *vma)
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{
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struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
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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_partial(vma, vma->vm_start,
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mdev_state->memblk, 0,
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vma->vm_end - vma->vm_start);
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}
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static int mdpy_get_region_info(struct mdev_device *mdev,
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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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struct mdev_state *mdev_state;
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mdev_state = mdev_get_drvdata(mdev);
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if (!mdev_state)
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return -EINVAL;
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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 mdev_device *mdev,
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struct vfio_irq_info *irq_info)
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{
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irq_info->count = 0;
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return 0;
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}
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static int mdpy_get_device_info(struct mdev_device *mdev,
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struct vfio_device_info *dev_info)
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{
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dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
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dev_info->num_regions = VFIO_PCI_NUM_REGIONS;
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dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
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return 0;
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}
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static int mdpy_query_gfx_plane(struct mdev_device *mdev,
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struct vfio_device_gfx_plane_info *plane)
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{
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struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
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if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) {
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if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE |
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VFIO_GFX_PLANE_TYPE_REGION))
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return 0;
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return -EINVAL;
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}
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if (plane->flags != VFIO_GFX_PLANE_TYPE_REGION)
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return -EINVAL;
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plane->drm_format = mdev_state->type->format;
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plane->width = mdev_state->type->width;
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plane->height = mdev_state->type->height;
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plane->stride = (mdev_state->type->width *
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mdev_state->type->bytepp);
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plane->size = mdev_state->memsize;
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plane->region_index = MDPY_DISPLAY_REGION;
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/* unused */
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plane->drm_format_mod = 0;
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plane->x_pos = 0;
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plane->y_pos = 0;
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plane->x_hot = 0;
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plane->y_hot = 0;
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return 0;
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}
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|
|
static long mdpy_ioctl(struct mdev_device *mdev, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
int ret = 0;
|
|
unsigned long minsz;
|
|
struct mdev_state *mdev_state;
|
|
|
|
mdev_state = mdev_get_drvdata(mdev);
|
|
|
|
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(mdev, &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, &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(mdev, &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, &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);
|
|
}
|
|
return -ENOTTY;
|
|
}
|
|
|
|
static int mdpy_open(struct mdev_device *mdev)
|
|
{
|
|
if (!try_module_get(THIS_MODULE))
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mdpy_close(struct mdev_device *mdev)
|
|
{
|
|
module_put(THIS_MODULE);
|
|
}
|
|
|
|
static ssize_t
|
|
resolution_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct mdev_device *mdev = mdev_from_dev(dev);
|
|
struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
|
|
|
|
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
|
|
name_show(struct kobject *kobj, struct device *dev, char *buf)
|
|
{
|
|
return sprintf(buf, "%s\n", kobj->name);
|
|
}
|
|
static MDEV_TYPE_ATTR_RO(name);
|
|
|
|
static ssize_t
|
|
description_show(struct kobject *kobj, struct device *dev, char *buf)
|
|
{
|
|
const struct mdpy_type *type =
|
|
&mdpy_types[mtype_get_type_group_id(kobj)];
|
|
|
|
return sprintf(buf, "virtual display, %dx%d framebuffer\n",
|
|
type ? type->width : 0,
|
|
type ? type->height : 0);
|
|
}
|
|
static MDEV_TYPE_ATTR_RO(description);
|
|
|
|
static ssize_t
|
|
available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", max_devices - mdpy_count);
|
|
}
|
|
static MDEV_TYPE_ATTR_RO(available_instances);
|
|
|
|
static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
|
|
}
|
|
static MDEV_TYPE_ATTR_RO(device_api);
|
|
|
|
static struct attribute *mdev_types_attrs[] = {
|
|
&mdev_type_attr_name.attr,
|
|
&mdev_type_attr_description.attr,
|
|
&mdev_type_attr_device_api.attr,
|
|
&mdev_type_attr_available_instances.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group mdev_type_group1 = {
|
|
.name = MDPY_TYPE_1,
|
|
.attrs = mdev_types_attrs,
|
|
};
|
|
|
|
static struct attribute_group mdev_type_group2 = {
|
|
.name = MDPY_TYPE_2,
|
|
.attrs = mdev_types_attrs,
|
|
};
|
|
|
|
static struct attribute_group mdev_type_group3 = {
|
|
.name = MDPY_TYPE_3,
|
|
.attrs = mdev_types_attrs,
|
|
};
|
|
|
|
static struct attribute_group *mdev_type_groups[] = {
|
|
&mdev_type_group1,
|
|
&mdev_type_group2,
|
|
&mdev_type_group3,
|
|
NULL,
|
|
};
|
|
|
|
static const struct mdev_parent_ops mdev_fops = {
|
|
.owner = THIS_MODULE,
|
|
.mdev_attr_groups = mdev_dev_groups,
|
|
.supported_type_groups = mdev_type_groups,
|
|
.create = mdpy_create,
|
|
.remove = mdpy_remove,
|
|
.open = mdpy_open,
|
|
.release = mdpy_close,
|
|
.read = mdpy_read,
|
|
.write = mdpy_write,
|
|
.ioctl = mdpy_ioctl,
|
|
.mmap = mdpy_mmap,
|
|
};
|
|
|
|
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));
|
|
|
|
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 failed1;
|
|
}
|
|
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 failed2;
|
|
|
|
ret = mdev_register_device(&mdpy_dev, &mdev_fops);
|
|
if (ret)
|
|
goto failed3;
|
|
|
|
return 0;
|
|
|
|
failed3:
|
|
device_unregister(&mdpy_dev);
|
|
failed2:
|
|
class_destroy(mdpy_class);
|
|
failed1:
|
|
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_device(&mdpy_dev);
|
|
|
|
device_unregister(&mdpy_dev);
|
|
cdev_del(&mdpy_cdev);
|
|
unregister_chrdev_region(mdpy_devt, MINORMASK + 1);
|
|
class_destroy(mdpy_class);
|
|
mdpy_class = NULL;
|
|
}
|
|
|
|
module_init(mdpy_dev_init)
|
|
module_exit(mdpy_dev_exit)
|