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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Mediated virtual PCI display host device driver
- *
- * Emulate enough of qemu stdvga to make bochs-drm.ko happy. That is
- * basically the vram memory bar and the bochs dispi interface vbe
- * registers in the mmio register bar. Specifically it does *not*
- * include any legacy vga stuff. Device looks a lot like "qemu -device
- * secondary-vga".
- *
- * (c) Gerd Hoffmann <kraxel@redhat.com>
- *
- * based on mtty driver which is:
- * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
- * Author: Neo Jia <cjia@nvidia.com>
- * Kirti Wankhede <kwankhede@nvidia.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #include <linux/init.h>
- #include <linux/module.h>
- #include <linux/device.h>
- #include <linux/kernel.h>
- #include <linux/slab.h>
- #include <linux/vmalloc.h>
- #include <linux/cdev.h>
- #include <linux/vfio.h>
- #include <linux/iommu.h>
- #include <linux/sysfs.h>
- #include <linux/mdev.h>
- #include <linux/pci.h>
- #include <linux/dma-buf.h>
- #include <linux/highmem.h>
- #include <drm/drm_fourcc.h>
- #include <drm/drm_rect.h>
- #include <drm/drm_modeset_lock.h>
- #include <drm/drm_property.h>
- #include <drm/drm_plane.h>
- #define VBE_DISPI_INDEX_ID 0x0
- #define VBE_DISPI_INDEX_XRES 0x1
- #define VBE_DISPI_INDEX_YRES 0x2
- #define VBE_DISPI_INDEX_BPP 0x3
- #define VBE_DISPI_INDEX_ENABLE 0x4
- #define VBE_DISPI_INDEX_BANK 0x5
- #define VBE_DISPI_INDEX_VIRT_WIDTH 0x6
- #define VBE_DISPI_INDEX_VIRT_HEIGHT 0x7
- #define VBE_DISPI_INDEX_X_OFFSET 0x8
- #define VBE_DISPI_INDEX_Y_OFFSET 0x9
- #define VBE_DISPI_INDEX_VIDEO_MEMORY_64K 0xa
- #define VBE_DISPI_INDEX_COUNT 0xb
- #define VBE_DISPI_ID0 0xB0C0
- #define VBE_DISPI_ID1 0xB0C1
- #define VBE_DISPI_ID2 0xB0C2
- #define VBE_DISPI_ID3 0xB0C3
- #define VBE_DISPI_ID4 0xB0C4
- #define VBE_DISPI_ID5 0xB0C5
- #define VBE_DISPI_DISABLED 0x00
- #define VBE_DISPI_ENABLED 0x01
- #define VBE_DISPI_GETCAPS 0x02
- #define VBE_DISPI_8BIT_DAC 0x20
- #define VBE_DISPI_LFB_ENABLED 0x40
- #define VBE_DISPI_NOCLEARMEM 0x80
- #define MBOCHS_NAME "mbochs"
- #define MBOCHS_CLASS_NAME "mbochs"
- #define MBOCHS_EDID_REGION_INDEX VFIO_PCI_NUM_REGIONS
- #define MBOCHS_NUM_REGIONS (MBOCHS_EDID_REGION_INDEX+1)
- #define MBOCHS_CONFIG_SPACE_SIZE 0xff
- #define MBOCHS_MMIO_BAR_OFFSET PAGE_SIZE
- #define MBOCHS_MMIO_BAR_SIZE PAGE_SIZE
- #define MBOCHS_EDID_OFFSET (MBOCHS_MMIO_BAR_OFFSET + \
- MBOCHS_MMIO_BAR_SIZE)
- #define MBOCHS_EDID_SIZE PAGE_SIZE
- #define MBOCHS_MEMORY_BAR_OFFSET (MBOCHS_EDID_OFFSET + \
- MBOCHS_EDID_SIZE)
- #define MBOCHS_EDID_BLOB_OFFSET (MBOCHS_EDID_SIZE/2)
- #define STORE_LE16(addr, val) (*(u16 *)addr = val)
- #define STORE_LE32(addr, val) (*(u32 *)addr = val)
- MODULE_LICENSE("GPL v2");
- static int max_mbytes = 256;
- module_param_named(count, max_mbytes, int, 0444);
- MODULE_PARM_DESC(mem, "megabytes available to " MBOCHS_NAME " devices");
- #define MBOCHS_TYPE_1 "small"
- #define MBOCHS_TYPE_2 "medium"
- #define MBOCHS_TYPE_3 "large"
- static const struct mbochs_type {
- const char *name;
- u32 mbytes;
- u32 max_x;
- u32 max_y;
- } mbochs_types[] = {
- {
- .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_1,
- .mbytes = 4,
- .max_x = 800,
- .max_y = 600,
- }, {
- .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_2,
- .mbytes = 16,
- .max_x = 1920,
- .max_y = 1440,
- }, {
- .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_3,
- .mbytes = 64,
- .max_x = 0,
- .max_y = 0,
- },
- };
- static dev_t mbochs_devt;
- static struct class *mbochs_class;
- static struct cdev mbochs_cdev;
- static struct device mbochs_dev;
- static int mbochs_used_mbytes;
- struct vfio_region_info_ext {
- struct vfio_region_info base;
- struct vfio_region_info_cap_type type;
- };
- struct mbochs_mode {
- u32 drm_format;
- u32 bytepp;
- u32 width;
- u32 height;
- u32 stride;
- u32 __pad;
- u64 offset;
- u64 size;
- };
- struct mbochs_dmabuf {
- struct mbochs_mode mode;
- u32 id;
- struct page **pages;
- pgoff_t pagecount;
- struct dma_buf *buf;
- struct mdev_state *mdev_state;
- struct list_head next;
- bool unlinked;
- };
- /* State of each mdev device */
- struct mdev_state {
- u8 *vconfig;
- u64 bar_mask[3];
- u32 memory_bar_mask;
- struct mutex ops_lock;
- struct mdev_device *mdev;
- const struct mbochs_type *type;
- u16 vbe[VBE_DISPI_INDEX_COUNT];
- u64 memsize;
- struct page **pages;
- pgoff_t pagecount;
- struct vfio_region_gfx_edid edid_regs;
- u8 edid_blob[0x400];
- struct list_head dmabufs;
- u32 active_id;
- u32 next_id;
- };
- static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = {
- [VBE_DISPI_INDEX_ID] = "id",
- [VBE_DISPI_INDEX_XRES] = "xres",
- [VBE_DISPI_INDEX_YRES] = "yres",
- [VBE_DISPI_INDEX_BPP] = "bpp",
- [VBE_DISPI_INDEX_ENABLE] = "enable",
- [VBE_DISPI_INDEX_BANK] = "bank",
- [VBE_DISPI_INDEX_VIRT_WIDTH] = "virt-width",
- [VBE_DISPI_INDEX_VIRT_HEIGHT] = "virt-height",
- [VBE_DISPI_INDEX_X_OFFSET] = "x-offset",
- [VBE_DISPI_INDEX_Y_OFFSET] = "y-offset",
- [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem",
- };
- static const char *vbe_name(u32 index)
- {
- if (index < ARRAY_SIZE(vbe_name_list))
- return vbe_name_list[index];
- return "(invalid)";
- }
- static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
- pgoff_t pgoff);
- static struct page *mbochs_get_page(struct mdev_state *mdev_state,
- pgoff_t pgoff);
- static const struct mbochs_type *mbochs_find_type(struct kobject *kobj)
- {
- int i;
- for (i = 0; i < ARRAY_SIZE(mbochs_types); i++)
- if (strcmp(mbochs_types[i].name, kobj->name) == 0)
- return mbochs_types + i;
- return NULL;
- }
- static void mbochs_create_config_space(struct mdev_state *mdev_state)
- {
- STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID],
- 0x1234);
- STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID],
- 0x1111);
- STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID],
- PCI_SUBVENDOR_ID_REDHAT_QUMRANET);
- STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID],
- PCI_SUBDEVICE_ID_QEMU);
- STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND],
- PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
- STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE],
- PCI_CLASS_DISPLAY_OTHER);
- mdev_state->vconfig[PCI_CLASS_REVISION] = 0x01;
- STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0],
- PCI_BASE_ADDRESS_SPACE_MEMORY |
- PCI_BASE_ADDRESS_MEM_TYPE_32 |
- PCI_BASE_ADDRESS_MEM_PREFETCH);
- mdev_state->bar_mask[0] = ~(mdev_state->memsize) + 1;
- STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_2],
- PCI_BASE_ADDRESS_SPACE_MEMORY |
- PCI_BASE_ADDRESS_MEM_TYPE_32);
- mdev_state->bar_mask[2] = ~(MBOCHS_MMIO_BAR_SIZE) + 1;
- }
- static int mbochs_check_framebuffer(struct mdev_state *mdev_state,
- struct mbochs_mode *mode)
- {
- struct device *dev = mdev_dev(mdev_state->mdev);
- u16 *vbe = mdev_state->vbe;
- u32 virt_width;
- WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
- if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED))
- goto nofb;
- memset(mode, 0, sizeof(*mode));
- switch (vbe[VBE_DISPI_INDEX_BPP]) {
- case 32:
- mode->drm_format = DRM_FORMAT_XRGB8888;
- mode->bytepp = 4;
- break;
- default:
- dev_info_ratelimited(dev, "%s: bpp %d not supported\n",
- __func__, vbe[VBE_DISPI_INDEX_BPP]);
- goto nofb;
- }
- mode->width = vbe[VBE_DISPI_INDEX_XRES];
- mode->height = vbe[VBE_DISPI_INDEX_YRES];
- virt_width = vbe[VBE_DISPI_INDEX_VIRT_WIDTH];
- if (virt_width < mode->width)
- virt_width = mode->width;
- mode->stride = virt_width * mode->bytepp;
- mode->size = (u64)mode->stride * mode->height;
- mode->offset = ((u64)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp +
- (u64)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride);
- if (mode->width < 64 || mode->height < 64) {
- dev_info_ratelimited(dev, "%s: invalid resolution %dx%d\n",
- __func__, mode->width, mode->height);
- goto nofb;
- }
- if (mode->offset + mode->size > mdev_state->memsize) {
- dev_info_ratelimited(dev, "%s: framebuffer memory overflow\n",
- __func__);
- goto nofb;
- }
- return 0;
- nofb:
- memset(mode, 0, sizeof(*mode));
- return -EINVAL;
- }
- static bool mbochs_modes_equal(struct mbochs_mode *mode1,
- struct mbochs_mode *mode2)
- {
- return memcmp(mode1, mode2, sizeof(struct mbochs_mode)) == 0;
- }
- static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset,
- char *buf, u32 count)
- {
- struct device *dev = mdev_dev(mdev_state->mdev);
- int index = (offset - PCI_BASE_ADDRESS_0) / 0x04;
- u32 cfg_addr;
- switch (offset) {
- case PCI_BASE_ADDRESS_0:
- case PCI_BASE_ADDRESS_2:
- cfg_addr = *(u32 *)buf;
- if (cfg_addr == 0xffffffff) {
- cfg_addr = (cfg_addr & mdev_state->bar_mask[index]);
- } else {
- cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK;
- if (cfg_addr)
- dev_info(dev, "BAR #%d @ 0x%x\n",
- index, cfg_addr);
- }
- cfg_addr |= (mdev_state->vconfig[offset] &
- ~PCI_BASE_ADDRESS_MEM_MASK);
- STORE_LE32(&mdev_state->vconfig[offset], cfg_addr);
- break;
- }
- }
- static void handle_mmio_write(struct mdev_state *mdev_state, u16 offset,
- char *buf, u32 count)
- {
- struct device *dev = mdev_dev(mdev_state->mdev);
- int index;
- u16 reg16;
- switch (offset) {
- case 0x400 ... 0x41f: /* vga ioports remapped */
- goto unhandled;
- case 0x500 ... 0x515: /* bochs dispi interface */
- if (count != 2)
- goto unhandled;
- index = (offset - 0x500) / 2;
- reg16 = *(u16 *)buf;
- if (index < ARRAY_SIZE(mdev_state->vbe))
- mdev_state->vbe[index] = reg16;
- dev_dbg(dev, "%s: vbe write %d = %d (%s)\n",
- __func__, index, reg16, vbe_name(index));
- break;
- case 0x600 ... 0x607: /* qemu extended regs */
- goto unhandled;
- default:
- unhandled:
- dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
- __func__, offset, count);
- break;
- }
- }
- static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset,
- char *buf, u32 count)
- {
- struct device *dev = mdev_dev(mdev_state->mdev);
- struct vfio_region_gfx_edid *edid;
- u16 reg16 = 0;
- int index;
- switch (offset) {
- case 0x000 ... 0x3ff: /* edid block */
- edid = &mdev_state->edid_regs;
- if (edid->link_state != VFIO_DEVICE_GFX_LINK_STATE_UP ||
- offset >= edid->edid_size) {
- memset(buf, 0, count);
- break;
- }
- memcpy(buf, mdev_state->edid_blob + offset, count);
- break;
- case 0x500 ... 0x515: /* bochs dispi interface */
- if (count != 2)
- goto unhandled;
- index = (offset - 0x500) / 2;
- if (index < ARRAY_SIZE(mdev_state->vbe))
- reg16 = mdev_state->vbe[index];
- dev_dbg(dev, "%s: vbe read %d = %d (%s)\n",
- __func__, index, reg16, vbe_name(index));
- *(u16 *)buf = reg16;
- break;
- default:
- unhandled:
- dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
- __func__, offset, count);
- memset(buf, 0, count);
- break;
- }
- }
- static void handle_edid_regs(struct mdev_state *mdev_state, u16 offset,
- char *buf, u32 count, bool is_write)
- {
- char *regs = (void *)&mdev_state->edid_regs;
- if (offset + count > sizeof(mdev_state->edid_regs))
- return;
- if (count != 4)
- return;
- if (offset % 4)
- return;
- if (is_write) {
- switch (offset) {
- case offsetof(struct vfio_region_gfx_edid, link_state):
- case offsetof(struct vfio_region_gfx_edid, edid_size):
- memcpy(regs + offset, buf, count);
- break;
- default:
- /* read-only regs */
- break;
- }
- } else {
- memcpy(buf, regs + offset, count);
- }
- }
- static void handle_edid_blob(struct mdev_state *mdev_state, u16 offset,
- char *buf, u32 count, bool is_write)
- {
- if (offset + count > mdev_state->edid_regs.edid_max_size)
- return;
- if (is_write)
- memcpy(mdev_state->edid_blob + offset, buf, count);
- else
- memcpy(buf, mdev_state->edid_blob + offset, count);
- }
- static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
- loff_t pos, bool is_write)
- {
- struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
- struct device *dev = mdev_dev(mdev);
- struct page *pg;
- loff_t poff;
- char *map;
- int ret = 0;
- mutex_lock(&mdev_state->ops_lock);
- if (pos < MBOCHS_CONFIG_SPACE_SIZE) {
- if (is_write)
- handle_pci_cfg_write(mdev_state, pos, buf, count);
- else
- memcpy(buf, (mdev_state->vconfig + pos), count);
- } else if (pos >= MBOCHS_MMIO_BAR_OFFSET &&
- pos + count <= (MBOCHS_MMIO_BAR_OFFSET +
- MBOCHS_MMIO_BAR_SIZE)) {
- pos -= MBOCHS_MMIO_BAR_OFFSET;
- if (is_write)
- handle_mmio_write(mdev_state, pos, buf, count);
- else
- handle_mmio_read(mdev_state, pos, buf, count);
- } else if (pos >= MBOCHS_EDID_OFFSET &&
- pos + count <= (MBOCHS_EDID_OFFSET +
- MBOCHS_EDID_SIZE)) {
- pos -= MBOCHS_EDID_OFFSET;
- if (pos < MBOCHS_EDID_BLOB_OFFSET) {
- handle_edid_regs(mdev_state, pos, buf, count, is_write);
- } else {
- pos -= MBOCHS_EDID_BLOB_OFFSET;
- handle_edid_blob(mdev_state, pos, buf, count, is_write);
- }
- } else if (pos >= MBOCHS_MEMORY_BAR_OFFSET &&
- pos + count <=
- MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) {
- pos -= MBOCHS_MMIO_BAR_OFFSET;
- poff = pos & ~PAGE_MASK;
- pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT);
- map = kmap(pg);
- if (is_write)
- memcpy(map + poff, buf, count);
- else
- memcpy(buf, map + poff, count);
- kunmap(pg);
- put_page(pg);
- } else {
- dev_dbg(dev, "%s: %s @0x%llx (unhandled)\n",
- __func__, is_write ? "WR" : "RD", pos);
- ret = -1;
- goto accessfailed;
- }
- ret = count;
- accessfailed:
- mutex_unlock(&mdev_state->ops_lock);
- return ret;
- }
- static int mbochs_reset(struct mdev_device *mdev)
- {
- struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
- u32 size64k = mdev_state->memsize / (64 * 1024);
- int i;
- for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++)
- mdev_state->vbe[i] = 0;
- mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5;
- mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k;
- return 0;
- }
- static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev)
- {
- const struct mbochs_type *type = mbochs_find_type(kobj);
- struct device *dev = mdev_dev(mdev);
- struct mdev_state *mdev_state;
- if (!type)
- type = &mbochs_types[0];
- if (type->mbytes + mbochs_used_mbytes > max_mbytes)
- return -ENOMEM;
- mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
- if (mdev_state == NULL)
- return -ENOMEM;
- mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL);
- if (mdev_state->vconfig == NULL)
- goto err_mem;
- mdev_state->memsize = type->mbytes * 1024 * 1024;
- mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT;
- mdev_state->pages = kcalloc(mdev_state->pagecount,
- sizeof(struct page *),
- GFP_KERNEL);
- if (!mdev_state->pages)
- goto err_mem;
- dev_info(dev, "%s: %s, %d MB, %ld pages\n", __func__,
- kobj->name, type->mbytes, mdev_state->pagecount);
- mutex_init(&mdev_state->ops_lock);
- mdev_state->mdev = mdev;
- mdev_set_drvdata(mdev, mdev_state);
- INIT_LIST_HEAD(&mdev_state->dmabufs);
- mdev_state->next_id = 1;
- mdev_state->type = type;
- mdev_state->edid_regs.max_xres = type->max_x;
- mdev_state->edid_regs.max_yres = type->max_y;
- mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET;
- mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob);
- mbochs_create_config_space(mdev_state);
- mbochs_reset(mdev);
- mbochs_used_mbytes += type->mbytes;
- return 0;
- err_mem:
- kfree(mdev_state->vconfig);
- kfree(mdev_state);
- return -ENOMEM;
- }
- static int mbochs_remove(struct mdev_device *mdev)
- {
- struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
- mbochs_used_mbytes -= mdev_state->type->mbytes;
- mdev_set_drvdata(mdev, NULL);
- kfree(mdev_state->pages);
- kfree(mdev_state->vconfig);
- kfree(mdev_state);
- return 0;
- }
- static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
- size_t count, loff_t *ppos)
- {
- unsigned int done = 0;
- int ret;
- while (count) {
- size_t filled;
- if (count >= 4 && !(*ppos % 4)) {
- u32 val;
- ret = mdev_access(mdev, (char *)&val, sizeof(val),
- *ppos, false);
- if (ret <= 0)
- goto read_err;
- if (copy_to_user(buf, &val, sizeof(val)))
- goto read_err;
- filled = 4;
- } else if (count >= 2 && !(*ppos % 2)) {
- u16 val;
- ret = mdev_access(mdev, (char *)&val, sizeof(val),
- *ppos, false);
- if (ret <= 0)
- goto read_err;
- if (copy_to_user(buf, &val, sizeof(val)))
- goto read_err;
- filled = 2;
- } else {
- u8 val;
- ret = mdev_access(mdev, (char *)&val, sizeof(val),
- *ppos, false);
- if (ret <= 0)
- goto read_err;
- if (copy_to_user(buf, &val, sizeof(val)))
- goto read_err;
- filled = 1;
- }
- count -= filled;
- done += filled;
- *ppos += filled;
- buf += filled;
- }
- return done;
- read_err:
- return -EFAULT;
- }
- static ssize_t mbochs_write(struct mdev_device *mdev, const char __user *buf,
- size_t count, loff_t *ppos)
- {
- unsigned int done = 0;
- int ret;
- while (count) {
- size_t filled;
- if (count >= 4 && !(*ppos % 4)) {
- u32 val;
- if (copy_from_user(&val, buf, sizeof(val)))
- goto write_err;
- ret = mdev_access(mdev, (char *)&val, sizeof(val),
- *ppos, true);
- if (ret <= 0)
- goto write_err;
- filled = 4;
- } else if (count >= 2 && !(*ppos % 2)) {
- u16 val;
- if (copy_from_user(&val, buf, sizeof(val)))
- goto write_err;
- ret = mdev_access(mdev, (char *)&val, sizeof(val),
- *ppos, true);
- if (ret <= 0)
- goto write_err;
- filled = 2;
- } else {
- u8 val;
- if (copy_from_user(&val, buf, sizeof(val)))
- goto write_err;
- ret = mdev_access(mdev, (char *)&val, sizeof(val),
- *ppos, true);
- if (ret <= 0)
- goto write_err;
- filled = 1;
- }
- count -= filled;
- done += filled;
- *ppos += filled;
- buf += filled;
- }
- return done;
- write_err:
- return -EFAULT;
- }
- static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
- pgoff_t pgoff)
- {
- WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
- if (!mdev_state->pages[pgoff]) {
- mdev_state->pages[pgoff] =
- alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0);
- if (!mdev_state->pages[pgoff])
- return NULL;
- }
- get_page(mdev_state->pages[pgoff]);
- return mdev_state->pages[pgoff];
- }
- static struct page *mbochs_get_page(struct mdev_state *mdev_state,
- pgoff_t pgoff)
- {
- struct page *page;
- if (WARN_ON(pgoff >= mdev_state->pagecount))
- return NULL;
- mutex_lock(&mdev_state->ops_lock);
- page = __mbochs_get_page(mdev_state, pgoff);
- mutex_unlock(&mdev_state->ops_lock);
- return page;
- }
- static void mbochs_put_pages(struct mdev_state *mdev_state)
- {
- struct device *dev = mdev_dev(mdev_state->mdev);
- int i, count = 0;
- WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
- for (i = 0; i < mdev_state->pagecount; i++) {
- if (!mdev_state->pages[i])
- continue;
- put_page(mdev_state->pages[i]);
- mdev_state->pages[i] = NULL;
- count++;
- }
- dev_dbg(dev, "%s: %d pages released\n", __func__, count);
- }
- static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf)
- {
- struct vm_area_struct *vma = vmf->vma;
- struct mdev_state *mdev_state = vma->vm_private_data;
- pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
- if (page_offset >= mdev_state->pagecount)
- return VM_FAULT_SIGBUS;
- vmf->page = mbochs_get_page(mdev_state, page_offset);
- if (!vmf->page)
- return VM_FAULT_SIGBUS;
- return 0;
- }
- static const struct vm_operations_struct mbochs_region_vm_ops = {
- .fault = mbochs_region_vm_fault,
- };
- static int mbochs_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
- {
- struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
- if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
- return -EINVAL;
- if (vma->vm_end < vma->vm_start)
- return -EINVAL;
- if (vma->vm_end - vma->vm_start > mdev_state->memsize)
- return -EINVAL;
- if ((vma->vm_flags & VM_SHARED) == 0)
- return -EINVAL;
- vma->vm_ops = &mbochs_region_vm_ops;
- vma->vm_private_data = mdev_state;
- return 0;
- }
- static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf)
- {
- struct vm_area_struct *vma = vmf->vma;
- struct mbochs_dmabuf *dmabuf = vma->vm_private_data;
- if (WARN_ON(vmf->pgoff >= dmabuf->pagecount))
- return VM_FAULT_SIGBUS;
- vmf->page = dmabuf->pages[vmf->pgoff];
- get_page(vmf->page);
- return 0;
- }
- static const struct vm_operations_struct mbochs_dmabuf_vm_ops = {
- .fault = mbochs_dmabuf_vm_fault,
- };
- static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma)
- {
- struct mbochs_dmabuf *dmabuf = buf->priv;
- struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
- dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
- if ((vma->vm_flags & VM_SHARED) == 0)
- return -EINVAL;
- vma->vm_ops = &mbochs_dmabuf_vm_ops;
- vma->vm_private_data = dmabuf;
- return 0;
- }
- static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf,
- const char *prefix)
- {
- struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
- u32 fourcc = dmabuf->mode.drm_format;
- dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n",
- prefix, dmabuf->id,
- fourcc ? ((fourcc >> 0) & 0xff) : '-',
- fourcc ? ((fourcc >> 8) & 0xff) : '-',
- fourcc ? ((fourcc >> 16) & 0xff) : '-',
- fourcc ? ((fourcc >> 24) & 0xff) : '-',
- dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride,
- dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount);
- }
- static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at,
- enum dma_data_direction direction)
- {
- struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
- struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
- struct sg_table *sg;
- dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
- sg = kzalloc(sizeof(*sg), GFP_KERNEL);
- if (!sg)
- goto err1;
- if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount,
- 0, dmabuf->mode.size, GFP_KERNEL) < 0)
- goto err2;
- if (dma_map_sgtable(at->dev, sg, direction, 0))
- goto err3;
- return sg;
- err3:
- sg_free_table(sg);
- err2:
- kfree(sg);
- err1:
- return ERR_PTR(-ENOMEM);
- }
- static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at,
- struct sg_table *sg,
- enum dma_data_direction direction)
- {
- struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
- struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
- dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
- dma_unmap_sgtable(at->dev, sg, direction, 0);
- sg_free_table(sg);
- kfree(sg);
- }
- static void mbochs_release_dmabuf(struct dma_buf *buf)
- {
- struct mbochs_dmabuf *dmabuf = buf->priv;
- struct mdev_state *mdev_state = dmabuf->mdev_state;
- struct device *dev = mdev_dev(mdev_state->mdev);
- pgoff_t pg;
- dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
- for (pg = 0; pg < dmabuf->pagecount; pg++)
- put_page(dmabuf->pages[pg]);
- mutex_lock(&mdev_state->ops_lock);
- dmabuf->buf = NULL;
- if (dmabuf->unlinked)
- kfree(dmabuf);
- mutex_unlock(&mdev_state->ops_lock);
- }
- static struct dma_buf_ops mbochs_dmabuf_ops = {
- .map_dma_buf = mbochs_map_dmabuf,
- .unmap_dma_buf = mbochs_unmap_dmabuf,
- .release = mbochs_release_dmabuf,
- .mmap = mbochs_mmap_dmabuf,
- };
- static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state,
- struct mbochs_mode *mode)
- {
- struct mbochs_dmabuf *dmabuf;
- pgoff_t page_offset, pg;
- WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
- dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL);
- if (!dmabuf)
- return NULL;
- dmabuf->mode = *mode;
- dmabuf->id = mdev_state->next_id++;
- dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE);
- dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *),
- GFP_KERNEL);
- if (!dmabuf->pages)
- goto err_free_dmabuf;
- page_offset = dmabuf->mode.offset >> PAGE_SHIFT;
- for (pg = 0; pg < dmabuf->pagecount; pg++) {
- dmabuf->pages[pg] = __mbochs_get_page(mdev_state,
- page_offset + pg);
- if (!dmabuf->pages[pg])
- goto err_free_pages;
- }
- dmabuf->mdev_state = mdev_state;
- list_add(&dmabuf->next, &mdev_state->dmabufs);
- mbochs_print_dmabuf(dmabuf, __func__);
- return dmabuf;
- err_free_pages:
- while (pg > 0)
- put_page(dmabuf->pages[--pg]);
- kfree(dmabuf->pages);
- err_free_dmabuf:
- kfree(dmabuf);
- return NULL;
- }
- static struct mbochs_dmabuf *
- mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state,
- struct mbochs_mode *mode)
- {
- struct mbochs_dmabuf *dmabuf;
- WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
- list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
- if (mbochs_modes_equal(&dmabuf->mode, mode))
- return dmabuf;
- return NULL;
- }
- static struct mbochs_dmabuf *
- mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id)
- {
- struct mbochs_dmabuf *dmabuf;
- WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
- list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
- if (dmabuf->id == id)
- return dmabuf;
- return NULL;
- }
- static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf)
- {
- struct mdev_state *mdev_state = dmabuf->mdev_state;
- struct device *dev = mdev_dev(mdev_state->mdev);
- DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
- struct dma_buf *buf;
- WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
- if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) {
- dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n",
- __func__);
- return -EINVAL;
- }
- exp_info.ops = &mbochs_dmabuf_ops;
- exp_info.size = dmabuf->mode.size;
- exp_info.priv = dmabuf;
- buf = dma_buf_export(&exp_info);
- if (IS_ERR(buf)) {
- dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n",
- __func__, PTR_ERR(buf));
- return PTR_ERR(buf);
- }
- dmabuf->buf = buf;
- dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
- return 0;
- }
- static int mbochs_get_region_info(struct mdev_device *mdev,
- struct vfio_region_info_ext *ext)
- {
- struct vfio_region_info *region_info = &ext->base;
- struct mdev_state *mdev_state;
- mdev_state = mdev_get_drvdata(mdev);
- if (!mdev_state)
- return -EINVAL;
- if (region_info->index >= MBOCHS_NUM_REGIONS)
- return -EINVAL;
- switch (region_info->index) {
- case VFIO_PCI_CONFIG_REGION_INDEX:
- region_info->offset = 0;
- region_info->size = MBOCHS_CONFIG_SPACE_SIZE;
- region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
- VFIO_REGION_INFO_FLAG_WRITE);
- break;
- case VFIO_PCI_BAR0_REGION_INDEX:
- region_info->offset = MBOCHS_MEMORY_BAR_OFFSET;
- region_info->size = mdev_state->memsize;
- region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
- VFIO_REGION_INFO_FLAG_WRITE |
- VFIO_REGION_INFO_FLAG_MMAP);
- break;
- case VFIO_PCI_BAR2_REGION_INDEX:
- region_info->offset = MBOCHS_MMIO_BAR_OFFSET;
- region_info->size = MBOCHS_MMIO_BAR_SIZE;
- region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
- VFIO_REGION_INFO_FLAG_WRITE);
- break;
- case MBOCHS_EDID_REGION_INDEX:
- ext->base.argsz = sizeof(*ext);
- ext->base.offset = MBOCHS_EDID_OFFSET;
- ext->base.size = MBOCHS_EDID_SIZE;
- ext->base.flags = (VFIO_REGION_INFO_FLAG_READ |
- VFIO_REGION_INFO_FLAG_WRITE |
- VFIO_REGION_INFO_FLAG_CAPS);
- ext->base.cap_offset = offsetof(typeof(*ext), type);
- ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE;
- ext->type.header.version = 1;
- ext->type.header.next = 0;
- ext->type.type = VFIO_REGION_TYPE_GFX;
- ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID;
- break;
- default:
- region_info->size = 0;
- region_info->offset = 0;
- region_info->flags = 0;
- }
- return 0;
- }
- static int mbochs_get_irq_info(struct mdev_device *mdev,
- struct vfio_irq_info *irq_info)
- {
- irq_info->count = 0;
- return 0;
- }
- static int mbochs_get_device_info(struct mdev_device *mdev,
- struct vfio_device_info *dev_info)
- {
- dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
- dev_info->num_regions = MBOCHS_NUM_REGIONS;
- dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
- return 0;
- }
- static int mbochs_query_gfx_plane(struct mdev_device *mdev,
- struct vfio_device_gfx_plane_info *plane)
- {
- struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
- struct device *dev = mdev_dev(mdev);
- struct mbochs_dmabuf *dmabuf;
- struct mbochs_mode mode;
- int ret;
- if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) {
- if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE |
- VFIO_GFX_PLANE_TYPE_DMABUF))
- return 0;
- return -EINVAL;
- }
- if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF)
- return -EINVAL;
- plane->drm_format_mod = 0;
- plane->x_pos = 0;
- plane->y_pos = 0;
- plane->x_hot = 0;
- plane->y_hot = 0;
- mutex_lock(&mdev_state->ops_lock);
- ret = -EINVAL;
- if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY)
- ret = mbochs_check_framebuffer(mdev_state, &mode);
- if (ret < 0) {
- plane->drm_format = 0;
- plane->width = 0;
- plane->height = 0;
- plane->stride = 0;
- plane->size = 0;
- plane->dmabuf_id = 0;
- goto done;
- }
- dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode);
- if (!dmabuf)
- mbochs_dmabuf_alloc(mdev_state, &mode);
- if (!dmabuf) {
- mutex_unlock(&mdev_state->ops_lock);
- return -ENOMEM;
- }
- plane->drm_format = dmabuf->mode.drm_format;
- plane->width = dmabuf->mode.width;
- plane->height = dmabuf->mode.height;
- plane->stride = dmabuf->mode.stride;
- plane->size = dmabuf->mode.size;
- plane->dmabuf_id = dmabuf->id;
- done:
- if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY &&
- mdev_state->active_id != plane->dmabuf_id) {
- dev_dbg(dev, "%s: primary: %d => %d\n", __func__,
- mdev_state->active_id, plane->dmabuf_id);
- mdev_state->active_id = plane->dmabuf_id;
- }
- mutex_unlock(&mdev_state->ops_lock);
- return 0;
- }
- static int mbochs_get_gfx_dmabuf(struct mdev_device *mdev,
- u32 id)
- {
- struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
- struct mbochs_dmabuf *dmabuf;
- mutex_lock(&mdev_state->ops_lock);
- dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id);
- if (!dmabuf) {
- mutex_unlock(&mdev_state->ops_lock);
- return -ENOENT;
- }
- if (!dmabuf->buf)
- mbochs_dmabuf_export(dmabuf);
- mutex_unlock(&mdev_state->ops_lock);
- if (!dmabuf->buf)
- return -EINVAL;
- return dma_buf_fd(dmabuf->buf, 0);
- }
- static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
- unsigned long arg)
- {
- int ret = 0;
- unsigned long minsz, outsz;
- 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 = mbochs_get_device_info(mdev, &info);
- if (ret)
- return ret;
- if (copy_to_user((void __user *)arg, &info, minsz))
- return -EFAULT;
- return 0;
- }
- case VFIO_DEVICE_GET_REGION_INFO:
- {
- struct vfio_region_info_ext info;
- minsz = offsetofend(typeof(info), base.offset);
- if (copy_from_user(&info, (void __user *)arg, minsz))
- return -EFAULT;
- outsz = info.base.argsz;
- if (outsz < minsz)
- return -EINVAL;
- if (outsz > sizeof(info))
- return -EINVAL;
- ret = mbochs_get_region_info(mdev, &info);
- if (ret)
- return ret;
- if (copy_to_user((void __user *)arg, &info, outsz))
- 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 >= VFIO_PCI_NUM_IRQS))
- return -EINVAL;
- ret = mbochs_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 = mbochs_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_GET_GFX_DMABUF:
- {
- u32 dmabuf_id;
- if (get_user(dmabuf_id, (__u32 __user *)arg))
- return -EFAULT;
- return mbochs_get_gfx_dmabuf(mdev, dmabuf_id);
- }
- case VFIO_DEVICE_SET_IRQS:
- return -EINVAL;
- case VFIO_DEVICE_RESET:
- return mbochs_reset(mdev);
- }
- return -ENOTTY;
- }
- static int mbochs_open(struct mdev_device *mdev)
- {
- if (!try_module_get(THIS_MODULE))
- return -ENODEV;
- return 0;
- }
- static void mbochs_close(struct mdev_device *mdev)
- {
- struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
- struct mbochs_dmabuf *dmabuf, *tmp;
- mutex_lock(&mdev_state->ops_lock);
- list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) {
- list_del(&dmabuf->next);
- if (dmabuf->buf) {
- /* free in mbochs_release_dmabuf() */
- dmabuf->unlinked = true;
- } else {
- kfree(dmabuf);
- }
- }
- mbochs_put_pages(mdev_state);
- mutex_unlock(&mdev_state->ops_lock);
- module_put(THIS_MODULE);
- }
- static ssize_t
- memory_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, "%d MB\n", mdev_state->type->mbytes);
- }
- static DEVICE_ATTR_RO(memory);
- static struct attribute *mdev_dev_attrs[] = {
- &dev_attr_memory.attr,
- NULL,
- };
- static const struct attribute_group mdev_dev_group = {
- .name = "vendor",
- .attrs = mdev_dev_attrs,
- };
- 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);
- }
- MDEV_TYPE_ATTR_RO(name);
- static ssize_t
- description_show(struct kobject *kobj, struct device *dev, char *buf)
- {
- const struct mbochs_type *type = mbochs_find_type(kobj);
- return sprintf(buf, "virtual display, %d MB video memory\n",
- type ? type->mbytes : 0);
- }
- MDEV_TYPE_ATTR_RO(description);
- static ssize_t
- available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
- {
- const struct mbochs_type *type = mbochs_find_type(kobj);
- int count = (max_mbytes - mbochs_used_mbytes) / type->mbytes;
- return sprintf(buf, "%d\n", count);
- }
- 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);
- }
- 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 = MBOCHS_TYPE_1,
- .attrs = mdev_types_attrs,
- };
- static struct attribute_group mdev_type_group2 = {
- .name = MBOCHS_TYPE_2,
- .attrs = mdev_types_attrs,
- };
- static struct attribute_group mdev_type_group3 = {
- .name = MBOCHS_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 = mbochs_create,
- .remove = mbochs_remove,
- .open = mbochs_open,
- .release = mbochs_close,
- .read = mbochs_read,
- .write = mbochs_write,
- .ioctl = mbochs_ioctl,
- .mmap = mbochs_mmap,
- };
- static const struct file_operations vd_fops = {
- .owner = THIS_MODULE,
- };
- static void mbochs_device_release(struct device *dev)
- {
- /* nothing */
- }
- static int __init mbochs_dev_init(void)
- {
- int ret = 0;
- ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME);
- if (ret < 0) {
- pr_err("Error: failed to register mbochs_dev, err: %d\n", ret);
- return ret;
- }
- cdev_init(&mbochs_cdev, &vd_fops);
- cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1);
- pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt));
- mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME);
- if (IS_ERR(mbochs_class)) {
- pr_err("Error: failed to register mbochs_dev class\n");
- ret = PTR_ERR(mbochs_class);
- goto failed1;
- }
- mbochs_dev.class = mbochs_class;
- mbochs_dev.release = mbochs_device_release;
- dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME);
- ret = device_register(&mbochs_dev);
- if (ret)
- goto failed2;
- ret = mdev_register_device(&mbochs_dev, &mdev_fops);
- if (ret)
- goto failed3;
- return 0;
- failed3:
- device_unregister(&mbochs_dev);
- failed2:
- class_destroy(mbochs_class);
- failed1:
- cdev_del(&mbochs_cdev);
- unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
- return ret;
- }
- static void __exit mbochs_dev_exit(void)
- {
- mbochs_dev.bus = NULL;
- mdev_unregister_device(&mbochs_dev);
- device_unregister(&mbochs_dev);
- cdev_del(&mbochs_cdev);
- unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
- class_destroy(mbochs_class);
- mbochs_class = NULL;
- }
- module_init(mbochs_dev_init)
- module_exit(mbochs_dev_exit)
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