1 // SPDX-License-Identifier: GPL-2.0
3 * Mediated virtual PCI display host device driver
5 * Emulate enough of qemu stdvga to make bochs-drm.ko happy. That is
6 * basically the vram memory bar and the bochs dispi interface vbe
7 * registers in the mmio register bar. Specifically it does *not*
8 * include any legacy vga stuff. Device looks a lot like "qemu -device
11 * (c) Gerd Hoffmann <kraxel@redhat.com>
13 * based on mtty driver which is:
14 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
15 * Author: Neo Jia <cjia@nvidia.com>
16 * Kirti Wankhede <kwankhede@nvidia.com>
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License version 2 as
20 * published by the Free Software Foundation.
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/device.h>
25 #include <linux/kernel.h>
26 #include <linux/slab.h>
27 #include <linux/vmalloc.h>
28 #include <linux/cdev.h>
29 #include <linux/vfio.h>
30 #include <linux/iommu.h>
31 #include <linux/sysfs.h>
32 #include <linux/mdev.h>
33 #include <linux/pci.h>
34 #include <linux/dma-buf.h>
35 #include <linux/highmem.h>
36 #include <drm/drm_fourcc.h>
37 #include <drm/drm_rect.h>
38 #include <drm/drm_modeset_lock.h>
39 #include <drm/drm_property.h>
40 #include <drm/drm_plane.h>
43 #define VBE_DISPI_INDEX_ID 0x0
44 #define VBE_DISPI_INDEX_XRES 0x1
45 #define VBE_DISPI_INDEX_YRES 0x2
46 #define VBE_DISPI_INDEX_BPP 0x3
47 #define VBE_DISPI_INDEX_ENABLE 0x4
48 #define VBE_DISPI_INDEX_BANK 0x5
49 #define VBE_DISPI_INDEX_VIRT_WIDTH 0x6
50 #define VBE_DISPI_INDEX_VIRT_HEIGHT 0x7
51 #define VBE_DISPI_INDEX_X_OFFSET 0x8
52 #define VBE_DISPI_INDEX_Y_OFFSET 0x9
53 #define VBE_DISPI_INDEX_VIDEO_MEMORY_64K 0xa
54 #define VBE_DISPI_INDEX_COUNT 0xb
56 #define VBE_DISPI_ID0 0xB0C0
57 #define VBE_DISPI_ID1 0xB0C1
58 #define VBE_DISPI_ID2 0xB0C2
59 #define VBE_DISPI_ID3 0xB0C3
60 #define VBE_DISPI_ID4 0xB0C4
61 #define VBE_DISPI_ID5 0xB0C5
63 #define VBE_DISPI_DISABLED 0x00
64 #define VBE_DISPI_ENABLED 0x01
65 #define VBE_DISPI_GETCAPS 0x02
66 #define VBE_DISPI_8BIT_DAC 0x20
67 #define VBE_DISPI_LFB_ENABLED 0x40
68 #define VBE_DISPI_NOCLEARMEM 0x80
71 #define MBOCHS_NAME "mbochs"
72 #define MBOCHS_CLASS_NAME "mbochs"
74 #define MBOCHS_EDID_REGION_INDEX VFIO_PCI_NUM_REGIONS
75 #define MBOCHS_NUM_REGIONS (MBOCHS_EDID_REGION_INDEX+1)
77 #define MBOCHS_CONFIG_SPACE_SIZE 0xff
78 #define MBOCHS_MMIO_BAR_OFFSET PAGE_SIZE
79 #define MBOCHS_MMIO_BAR_SIZE PAGE_SIZE
80 #define MBOCHS_EDID_OFFSET (MBOCHS_MMIO_BAR_OFFSET + \
82 #define MBOCHS_EDID_SIZE PAGE_SIZE
83 #define MBOCHS_MEMORY_BAR_OFFSET (MBOCHS_EDID_OFFSET + \
86 #define MBOCHS_EDID_BLOB_OFFSET (MBOCHS_EDID_SIZE/2)
88 #define STORE_LE16(addr, val) (*(u16 *)addr = val)
89 #define STORE_LE32(addr, val) (*(u32 *)addr = val)
92 MODULE_LICENSE("GPL v2");
94 static int max_mbytes = 256;
95 module_param_named(count, max_mbytes, int, 0444);
96 MODULE_PARM_DESC(mem, "megabytes available to " MBOCHS_NAME " devices");
99 #define MBOCHS_TYPE_1 "small"
100 #define MBOCHS_TYPE_2 "medium"
101 #define MBOCHS_TYPE_3 "large"
103 static const struct mbochs_type {
110 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_1,
115 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_2,
120 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_3,
128 static dev_t mbochs_devt;
129 static struct class *mbochs_class;
130 static struct cdev mbochs_cdev;
131 static struct device mbochs_dev;
132 static int mbochs_used_mbytes;
134 struct vfio_region_info_ext {
135 struct vfio_region_info base;
136 struct vfio_region_info_cap_type type;
150 struct mbochs_dmabuf {
151 struct mbochs_mode mode;
156 struct mdev_state *mdev_state;
157 struct list_head next;
161 /* State of each mdev device */
166 struct mutex ops_lock;
167 struct mdev_device *mdev;
169 const struct mbochs_type *type;
170 u16 vbe[VBE_DISPI_INDEX_COUNT];
174 struct vfio_region_gfx_edid edid_regs;
177 struct list_head dmabufs;
182 static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = {
183 [VBE_DISPI_INDEX_ID] = "id",
184 [VBE_DISPI_INDEX_XRES] = "xres",
185 [VBE_DISPI_INDEX_YRES] = "yres",
186 [VBE_DISPI_INDEX_BPP] = "bpp",
187 [VBE_DISPI_INDEX_ENABLE] = "enable",
188 [VBE_DISPI_INDEX_BANK] = "bank",
189 [VBE_DISPI_INDEX_VIRT_WIDTH] = "virt-width",
190 [VBE_DISPI_INDEX_VIRT_HEIGHT] = "virt-height",
191 [VBE_DISPI_INDEX_X_OFFSET] = "x-offset",
192 [VBE_DISPI_INDEX_Y_OFFSET] = "y-offset",
193 [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem",
196 static const char *vbe_name(u32 index)
198 if (index < ARRAY_SIZE(vbe_name_list))
199 return vbe_name_list[index];
203 static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
205 static struct page *mbochs_get_page(struct mdev_state *mdev_state,
208 static void mbochs_create_config_space(struct mdev_state *mdev_state)
210 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID],
212 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID],
214 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID],
215 PCI_SUBVENDOR_ID_REDHAT_QUMRANET);
216 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID],
217 PCI_SUBDEVICE_ID_QEMU);
219 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND],
220 PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
221 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE],
222 PCI_CLASS_DISPLAY_OTHER);
223 mdev_state->vconfig[PCI_CLASS_REVISION] = 0x01;
225 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0],
226 PCI_BASE_ADDRESS_SPACE_MEMORY |
227 PCI_BASE_ADDRESS_MEM_TYPE_32 |
228 PCI_BASE_ADDRESS_MEM_PREFETCH);
229 mdev_state->bar_mask[0] = ~(mdev_state->memsize) + 1;
231 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_2],
232 PCI_BASE_ADDRESS_SPACE_MEMORY |
233 PCI_BASE_ADDRESS_MEM_TYPE_32);
234 mdev_state->bar_mask[2] = ~(MBOCHS_MMIO_BAR_SIZE) + 1;
237 static int mbochs_check_framebuffer(struct mdev_state *mdev_state,
238 struct mbochs_mode *mode)
240 struct device *dev = mdev_dev(mdev_state->mdev);
241 u16 *vbe = mdev_state->vbe;
244 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
246 if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED))
249 memset(mode, 0, sizeof(*mode));
250 switch (vbe[VBE_DISPI_INDEX_BPP]) {
252 mode->drm_format = DRM_FORMAT_XRGB8888;
256 dev_info_ratelimited(dev, "%s: bpp %d not supported\n",
257 __func__, vbe[VBE_DISPI_INDEX_BPP]);
261 mode->width = vbe[VBE_DISPI_INDEX_XRES];
262 mode->height = vbe[VBE_DISPI_INDEX_YRES];
263 virt_width = vbe[VBE_DISPI_INDEX_VIRT_WIDTH];
264 if (virt_width < mode->width)
265 virt_width = mode->width;
266 mode->stride = virt_width * mode->bytepp;
267 mode->size = (u64)mode->stride * mode->height;
268 mode->offset = ((u64)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp +
269 (u64)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride);
271 if (mode->width < 64 || mode->height < 64) {
272 dev_info_ratelimited(dev, "%s: invalid resolution %dx%d\n",
273 __func__, mode->width, mode->height);
276 if (mode->offset + mode->size > mdev_state->memsize) {
277 dev_info_ratelimited(dev, "%s: framebuffer memory overflow\n",
285 memset(mode, 0, sizeof(*mode));
289 static bool mbochs_modes_equal(struct mbochs_mode *mode1,
290 struct mbochs_mode *mode2)
292 return memcmp(mode1, mode2, sizeof(struct mbochs_mode)) == 0;
295 static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset,
296 char *buf, u32 count)
298 struct device *dev = mdev_dev(mdev_state->mdev);
299 int index = (offset - PCI_BASE_ADDRESS_0) / 0x04;
303 case PCI_BASE_ADDRESS_0:
304 case PCI_BASE_ADDRESS_2:
305 cfg_addr = *(u32 *)buf;
307 if (cfg_addr == 0xffffffff) {
308 cfg_addr = (cfg_addr & mdev_state->bar_mask[index]);
310 cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK;
312 dev_info(dev, "BAR #%d @ 0x%x\n",
316 cfg_addr |= (mdev_state->vconfig[offset] &
317 ~PCI_BASE_ADDRESS_MEM_MASK);
318 STORE_LE32(&mdev_state->vconfig[offset], cfg_addr);
323 static void handle_mmio_write(struct mdev_state *mdev_state, u16 offset,
324 char *buf, u32 count)
326 struct device *dev = mdev_dev(mdev_state->mdev);
331 case 0x400 ... 0x41f: /* vga ioports remapped */
333 case 0x500 ... 0x515: /* bochs dispi interface */
336 index = (offset - 0x500) / 2;
338 if (index < ARRAY_SIZE(mdev_state->vbe))
339 mdev_state->vbe[index] = reg16;
340 dev_dbg(dev, "%s: vbe write %d = %d (%s)\n",
341 __func__, index, reg16, vbe_name(index));
343 case 0x600 ... 0x607: /* qemu extended regs */
347 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
348 __func__, offset, count);
353 static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset,
354 char *buf, u32 count)
356 struct device *dev = mdev_dev(mdev_state->mdev);
357 struct vfio_region_gfx_edid *edid;
362 case 0x000 ... 0x3ff: /* edid block */
363 edid = &mdev_state->edid_regs;
364 if (edid->link_state != VFIO_DEVICE_GFX_LINK_STATE_UP ||
365 offset >= edid->edid_size) {
366 memset(buf, 0, count);
369 memcpy(buf, mdev_state->edid_blob + offset, count);
371 case 0x500 ... 0x515: /* bochs dispi interface */
374 index = (offset - 0x500) / 2;
375 if (index < ARRAY_SIZE(mdev_state->vbe))
376 reg16 = mdev_state->vbe[index];
377 dev_dbg(dev, "%s: vbe read %d = %d (%s)\n",
378 __func__, index, reg16, vbe_name(index));
383 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
384 __func__, offset, count);
385 memset(buf, 0, count);
390 static void handle_edid_regs(struct mdev_state *mdev_state, u16 offset,
391 char *buf, u32 count, bool is_write)
393 char *regs = (void *)&mdev_state->edid_regs;
395 if (offset + count > sizeof(mdev_state->edid_regs))
404 case offsetof(struct vfio_region_gfx_edid, link_state):
405 case offsetof(struct vfio_region_gfx_edid, edid_size):
406 memcpy(regs + offset, buf, count);
413 memcpy(buf, regs + offset, count);
417 static void handle_edid_blob(struct mdev_state *mdev_state, u16 offset,
418 char *buf, u32 count, bool is_write)
420 if (offset + count > mdev_state->edid_regs.edid_max_size)
423 memcpy(mdev_state->edid_blob + offset, buf, count);
425 memcpy(buf, mdev_state->edid_blob + offset, count);
428 static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
429 loff_t pos, bool is_write)
431 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
432 struct device *dev = mdev_dev(mdev);
438 mutex_lock(&mdev_state->ops_lock);
440 if (pos < MBOCHS_CONFIG_SPACE_SIZE) {
442 handle_pci_cfg_write(mdev_state, pos, buf, count);
444 memcpy(buf, (mdev_state->vconfig + pos), count);
446 } else if (pos >= MBOCHS_MMIO_BAR_OFFSET &&
447 pos + count <= (MBOCHS_MMIO_BAR_OFFSET +
448 MBOCHS_MMIO_BAR_SIZE)) {
449 pos -= MBOCHS_MMIO_BAR_OFFSET;
451 handle_mmio_write(mdev_state, pos, buf, count);
453 handle_mmio_read(mdev_state, pos, buf, count);
455 } else if (pos >= MBOCHS_EDID_OFFSET &&
456 pos + count <= (MBOCHS_EDID_OFFSET +
458 pos -= MBOCHS_EDID_OFFSET;
459 if (pos < MBOCHS_EDID_BLOB_OFFSET) {
460 handle_edid_regs(mdev_state, pos, buf, count, is_write);
462 pos -= MBOCHS_EDID_BLOB_OFFSET;
463 handle_edid_blob(mdev_state, pos, buf, count, is_write);
466 } else if (pos >= MBOCHS_MEMORY_BAR_OFFSET &&
468 MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) {
469 pos -= MBOCHS_MMIO_BAR_OFFSET;
470 poff = pos & ~PAGE_MASK;
471 pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT);
474 memcpy(map + poff, buf, count);
476 memcpy(buf, map + poff, count);
481 dev_dbg(dev, "%s: %s @0x%llx (unhandled)\n",
482 __func__, is_write ? "WR" : "RD", pos);
491 mutex_unlock(&mdev_state->ops_lock);
496 static int mbochs_reset(struct mdev_device *mdev)
498 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
499 u32 size64k = mdev_state->memsize / (64 * 1024);
502 for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++)
503 mdev_state->vbe[i] = 0;
504 mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5;
505 mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k;
509 static int mbochs_create(struct mdev_device *mdev)
511 const struct mbochs_type *type =
512 &mbochs_types[mdev_get_type_group_id(mdev)];
513 struct device *dev = mdev_dev(mdev);
514 struct mdev_state *mdev_state;
517 type = &mbochs_types[0];
518 if (type->mbytes + mbochs_used_mbytes > max_mbytes)
521 mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
522 if (mdev_state == NULL)
525 mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL);
526 if (mdev_state->vconfig == NULL)
529 mdev_state->memsize = type->mbytes * 1024 * 1024;
530 mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT;
531 mdev_state->pages = kcalloc(mdev_state->pagecount,
532 sizeof(struct page *),
534 if (!mdev_state->pages)
537 dev_info(dev, "%s: %s, %d MB, %ld pages\n", __func__,
538 type->name, type->mbytes, mdev_state->pagecount);
540 mutex_init(&mdev_state->ops_lock);
541 mdev_state->mdev = mdev;
542 mdev_set_drvdata(mdev, mdev_state);
543 INIT_LIST_HEAD(&mdev_state->dmabufs);
544 mdev_state->next_id = 1;
546 mdev_state->type = type;
547 mdev_state->edid_regs.max_xres = type->max_x;
548 mdev_state->edid_regs.max_yres = type->max_y;
549 mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET;
550 mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob);
551 mbochs_create_config_space(mdev_state);
554 mbochs_used_mbytes += type->mbytes;
558 kfree(mdev_state->vconfig);
563 static int mbochs_remove(struct mdev_device *mdev)
565 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
567 mbochs_used_mbytes -= mdev_state->type->mbytes;
568 mdev_set_drvdata(mdev, NULL);
569 kfree(mdev_state->pages);
570 kfree(mdev_state->vconfig);
575 static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
576 size_t count, loff_t *ppos)
578 unsigned int done = 0;
584 if (count >= 4 && !(*ppos % 4)) {
587 ret = mdev_access(mdev, (char *)&val, sizeof(val),
592 if (copy_to_user(buf, &val, sizeof(val)))
596 } else if (count >= 2 && !(*ppos % 2)) {
599 ret = mdev_access(mdev, (char *)&val, sizeof(val),
604 if (copy_to_user(buf, &val, sizeof(val)))
611 ret = mdev_access(mdev, (char *)&val, sizeof(val),
616 if (copy_to_user(buf, &val, sizeof(val)))
634 static ssize_t mbochs_write(struct mdev_device *mdev, const char __user *buf,
635 size_t count, loff_t *ppos)
637 unsigned int done = 0;
643 if (count >= 4 && !(*ppos % 4)) {
646 if (copy_from_user(&val, buf, sizeof(val)))
649 ret = mdev_access(mdev, (char *)&val, sizeof(val),
655 } else if (count >= 2 && !(*ppos % 2)) {
658 if (copy_from_user(&val, buf, sizeof(val)))
661 ret = mdev_access(mdev, (char *)&val, sizeof(val),
670 if (copy_from_user(&val, buf, sizeof(val)))
673 ret = mdev_access(mdev, (char *)&val, sizeof(val),
691 static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
694 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
696 if (!mdev_state->pages[pgoff]) {
697 mdev_state->pages[pgoff] =
698 alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0);
699 if (!mdev_state->pages[pgoff])
703 get_page(mdev_state->pages[pgoff]);
704 return mdev_state->pages[pgoff];
707 static struct page *mbochs_get_page(struct mdev_state *mdev_state,
712 if (WARN_ON(pgoff >= mdev_state->pagecount))
715 mutex_lock(&mdev_state->ops_lock);
716 page = __mbochs_get_page(mdev_state, pgoff);
717 mutex_unlock(&mdev_state->ops_lock);
722 static void mbochs_put_pages(struct mdev_state *mdev_state)
724 struct device *dev = mdev_dev(mdev_state->mdev);
727 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
729 for (i = 0; i < mdev_state->pagecount; i++) {
730 if (!mdev_state->pages[i])
732 put_page(mdev_state->pages[i]);
733 mdev_state->pages[i] = NULL;
736 dev_dbg(dev, "%s: %d pages released\n", __func__, count);
739 static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf)
741 struct vm_area_struct *vma = vmf->vma;
742 struct mdev_state *mdev_state = vma->vm_private_data;
743 pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
745 if (page_offset >= mdev_state->pagecount)
746 return VM_FAULT_SIGBUS;
748 vmf->page = mbochs_get_page(mdev_state, page_offset);
750 return VM_FAULT_SIGBUS;
755 static const struct vm_operations_struct mbochs_region_vm_ops = {
756 .fault = mbochs_region_vm_fault,
759 static int mbochs_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
761 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
763 if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
765 if (vma->vm_end < vma->vm_start)
767 if (vma->vm_end - vma->vm_start > mdev_state->memsize)
769 if ((vma->vm_flags & VM_SHARED) == 0)
772 vma->vm_ops = &mbochs_region_vm_ops;
773 vma->vm_private_data = mdev_state;
777 static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf)
779 struct vm_area_struct *vma = vmf->vma;
780 struct mbochs_dmabuf *dmabuf = vma->vm_private_data;
782 if (WARN_ON(vmf->pgoff >= dmabuf->pagecount))
783 return VM_FAULT_SIGBUS;
785 vmf->page = dmabuf->pages[vmf->pgoff];
790 static const struct vm_operations_struct mbochs_dmabuf_vm_ops = {
791 .fault = mbochs_dmabuf_vm_fault,
794 static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma)
796 struct mbochs_dmabuf *dmabuf = buf->priv;
797 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
799 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
801 if ((vma->vm_flags & VM_SHARED) == 0)
804 vma->vm_ops = &mbochs_dmabuf_vm_ops;
805 vma->vm_private_data = dmabuf;
809 static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf,
812 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
813 u32 fourcc = dmabuf->mode.drm_format;
815 dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n",
817 fourcc ? ((fourcc >> 0) & 0xff) : '-',
818 fourcc ? ((fourcc >> 8) & 0xff) : '-',
819 fourcc ? ((fourcc >> 16) & 0xff) : '-',
820 fourcc ? ((fourcc >> 24) & 0xff) : '-',
821 dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride,
822 dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount);
825 static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at,
826 enum dma_data_direction direction)
828 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
829 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
832 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
834 sg = kzalloc(sizeof(*sg), GFP_KERNEL);
837 if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount,
838 0, dmabuf->mode.size, GFP_KERNEL) < 0)
840 if (dma_map_sgtable(at->dev, sg, direction, 0))
850 return ERR_PTR(-ENOMEM);
853 static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at,
855 enum dma_data_direction direction)
857 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
858 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
860 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
862 dma_unmap_sgtable(at->dev, sg, direction, 0);
867 static void mbochs_release_dmabuf(struct dma_buf *buf)
869 struct mbochs_dmabuf *dmabuf = buf->priv;
870 struct mdev_state *mdev_state = dmabuf->mdev_state;
871 struct device *dev = mdev_dev(mdev_state->mdev);
874 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
876 for (pg = 0; pg < dmabuf->pagecount; pg++)
877 put_page(dmabuf->pages[pg]);
879 mutex_lock(&mdev_state->ops_lock);
881 if (dmabuf->unlinked)
883 mutex_unlock(&mdev_state->ops_lock);
886 static struct dma_buf_ops mbochs_dmabuf_ops = {
887 .map_dma_buf = mbochs_map_dmabuf,
888 .unmap_dma_buf = mbochs_unmap_dmabuf,
889 .release = mbochs_release_dmabuf,
890 .mmap = mbochs_mmap_dmabuf,
893 static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state,
894 struct mbochs_mode *mode)
896 struct mbochs_dmabuf *dmabuf;
897 pgoff_t page_offset, pg;
899 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
901 dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL);
905 dmabuf->mode = *mode;
906 dmabuf->id = mdev_state->next_id++;
907 dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE);
908 dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *),
911 goto err_free_dmabuf;
913 page_offset = dmabuf->mode.offset >> PAGE_SHIFT;
914 for (pg = 0; pg < dmabuf->pagecount; pg++) {
915 dmabuf->pages[pg] = __mbochs_get_page(mdev_state,
917 if (!dmabuf->pages[pg])
921 dmabuf->mdev_state = mdev_state;
922 list_add(&dmabuf->next, &mdev_state->dmabufs);
924 mbochs_print_dmabuf(dmabuf, __func__);
929 put_page(dmabuf->pages[--pg]);
930 kfree(dmabuf->pages);
936 static struct mbochs_dmabuf *
937 mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state,
938 struct mbochs_mode *mode)
940 struct mbochs_dmabuf *dmabuf;
942 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
944 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
945 if (mbochs_modes_equal(&dmabuf->mode, mode))
951 static struct mbochs_dmabuf *
952 mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id)
954 struct mbochs_dmabuf *dmabuf;
956 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
958 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
959 if (dmabuf->id == id)
965 static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf)
967 struct mdev_state *mdev_state = dmabuf->mdev_state;
968 struct device *dev = mdev_dev(mdev_state->mdev);
969 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
972 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
974 if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) {
975 dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n",
980 exp_info.ops = &mbochs_dmabuf_ops;
981 exp_info.size = dmabuf->mode.size;
982 exp_info.priv = dmabuf;
984 buf = dma_buf_export(&exp_info);
986 dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n",
987 __func__, PTR_ERR(buf));
992 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
996 static int mbochs_get_region_info(struct mdev_device *mdev,
997 struct vfio_region_info_ext *ext)
999 struct vfio_region_info *region_info = &ext->base;
1000 struct mdev_state *mdev_state;
1002 mdev_state = mdev_get_drvdata(mdev);
1006 if (region_info->index >= MBOCHS_NUM_REGIONS)
1009 switch (region_info->index) {
1010 case VFIO_PCI_CONFIG_REGION_INDEX:
1011 region_info->offset = 0;
1012 region_info->size = MBOCHS_CONFIG_SPACE_SIZE;
1013 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1014 VFIO_REGION_INFO_FLAG_WRITE);
1016 case VFIO_PCI_BAR0_REGION_INDEX:
1017 region_info->offset = MBOCHS_MEMORY_BAR_OFFSET;
1018 region_info->size = mdev_state->memsize;
1019 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1020 VFIO_REGION_INFO_FLAG_WRITE |
1021 VFIO_REGION_INFO_FLAG_MMAP);
1023 case VFIO_PCI_BAR2_REGION_INDEX:
1024 region_info->offset = MBOCHS_MMIO_BAR_OFFSET;
1025 region_info->size = MBOCHS_MMIO_BAR_SIZE;
1026 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1027 VFIO_REGION_INFO_FLAG_WRITE);
1029 case MBOCHS_EDID_REGION_INDEX:
1030 ext->base.argsz = sizeof(*ext);
1031 ext->base.offset = MBOCHS_EDID_OFFSET;
1032 ext->base.size = MBOCHS_EDID_SIZE;
1033 ext->base.flags = (VFIO_REGION_INFO_FLAG_READ |
1034 VFIO_REGION_INFO_FLAG_WRITE |
1035 VFIO_REGION_INFO_FLAG_CAPS);
1036 ext->base.cap_offset = offsetof(typeof(*ext), type);
1037 ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE;
1038 ext->type.header.version = 1;
1039 ext->type.header.next = 0;
1040 ext->type.type = VFIO_REGION_TYPE_GFX;
1041 ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID;
1044 region_info->size = 0;
1045 region_info->offset = 0;
1046 region_info->flags = 0;
1052 static int mbochs_get_irq_info(struct mdev_device *mdev,
1053 struct vfio_irq_info *irq_info)
1055 irq_info->count = 0;
1059 static int mbochs_get_device_info(struct mdev_device *mdev,
1060 struct vfio_device_info *dev_info)
1062 dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
1063 dev_info->num_regions = MBOCHS_NUM_REGIONS;
1064 dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
1068 static int mbochs_query_gfx_plane(struct mdev_device *mdev,
1069 struct vfio_device_gfx_plane_info *plane)
1071 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1072 struct device *dev = mdev_dev(mdev);
1073 struct mbochs_dmabuf *dmabuf;
1074 struct mbochs_mode mode;
1077 if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) {
1078 if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE |
1079 VFIO_GFX_PLANE_TYPE_DMABUF))
1084 if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF)
1087 plane->drm_format_mod = 0;
1093 mutex_lock(&mdev_state->ops_lock);
1096 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY)
1097 ret = mbochs_check_framebuffer(mdev_state, &mode);
1099 plane->drm_format = 0;
1104 plane->dmabuf_id = 0;
1108 dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode);
1110 mbochs_dmabuf_alloc(mdev_state, &mode);
1112 mutex_unlock(&mdev_state->ops_lock);
1116 plane->drm_format = dmabuf->mode.drm_format;
1117 plane->width = dmabuf->mode.width;
1118 plane->height = dmabuf->mode.height;
1119 plane->stride = dmabuf->mode.stride;
1120 plane->size = dmabuf->mode.size;
1121 plane->dmabuf_id = dmabuf->id;
1124 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY &&
1125 mdev_state->active_id != plane->dmabuf_id) {
1126 dev_dbg(dev, "%s: primary: %d => %d\n", __func__,
1127 mdev_state->active_id, plane->dmabuf_id);
1128 mdev_state->active_id = plane->dmabuf_id;
1130 mutex_unlock(&mdev_state->ops_lock);
1134 static int mbochs_get_gfx_dmabuf(struct mdev_device *mdev,
1137 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1138 struct mbochs_dmabuf *dmabuf;
1140 mutex_lock(&mdev_state->ops_lock);
1142 dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id);
1144 mutex_unlock(&mdev_state->ops_lock);
1149 mbochs_dmabuf_export(dmabuf);
1151 mutex_unlock(&mdev_state->ops_lock);
1156 return dma_buf_fd(dmabuf->buf, 0);
1159 static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
1163 unsigned long minsz, outsz;
1166 case VFIO_DEVICE_GET_INFO:
1168 struct vfio_device_info info;
1170 minsz = offsetofend(struct vfio_device_info, num_irqs);
1172 if (copy_from_user(&info, (void __user *)arg, minsz))
1175 if (info.argsz < minsz)
1178 ret = mbochs_get_device_info(mdev, &info);
1182 if (copy_to_user((void __user *)arg, &info, minsz))
1187 case VFIO_DEVICE_GET_REGION_INFO:
1189 struct vfio_region_info_ext info;
1191 minsz = offsetofend(typeof(info), base.offset);
1193 if (copy_from_user(&info, (void __user *)arg, minsz))
1196 outsz = info.base.argsz;
1199 if (outsz > sizeof(info))
1202 ret = mbochs_get_region_info(mdev, &info);
1206 if (copy_to_user((void __user *)arg, &info, outsz))
1212 case VFIO_DEVICE_GET_IRQ_INFO:
1214 struct vfio_irq_info info;
1216 minsz = offsetofend(struct vfio_irq_info, count);
1218 if (copy_from_user(&info, (void __user *)arg, minsz))
1221 if ((info.argsz < minsz) ||
1222 (info.index >= VFIO_PCI_NUM_IRQS))
1225 ret = mbochs_get_irq_info(mdev, &info);
1229 if (copy_to_user((void __user *)arg, &info, minsz))
1235 case VFIO_DEVICE_QUERY_GFX_PLANE:
1237 struct vfio_device_gfx_plane_info plane;
1239 minsz = offsetofend(struct vfio_device_gfx_plane_info,
1242 if (copy_from_user(&plane, (void __user *)arg, minsz))
1245 if (plane.argsz < minsz)
1248 ret = mbochs_query_gfx_plane(mdev, &plane);
1252 if (copy_to_user((void __user *)arg, &plane, minsz))
1258 case VFIO_DEVICE_GET_GFX_DMABUF:
1262 if (get_user(dmabuf_id, (__u32 __user *)arg))
1265 return mbochs_get_gfx_dmabuf(mdev, dmabuf_id);
1268 case VFIO_DEVICE_SET_IRQS:
1271 case VFIO_DEVICE_RESET:
1272 return mbochs_reset(mdev);
1277 static int mbochs_open(struct mdev_device *mdev)
1279 if (!try_module_get(THIS_MODULE))
1285 static void mbochs_close(struct mdev_device *mdev)
1287 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1288 struct mbochs_dmabuf *dmabuf, *tmp;
1290 mutex_lock(&mdev_state->ops_lock);
1292 list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) {
1293 list_del(&dmabuf->next);
1295 /* free in mbochs_release_dmabuf() */
1296 dmabuf->unlinked = true;
1301 mbochs_put_pages(mdev_state);
1303 mutex_unlock(&mdev_state->ops_lock);
1304 module_put(THIS_MODULE);
1308 memory_show(struct device *dev, struct device_attribute *attr,
1311 struct mdev_device *mdev = mdev_from_dev(dev);
1312 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1314 return sprintf(buf, "%d MB\n", mdev_state->type->mbytes);
1316 static DEVICE_ATTR_RO(memory);
1318 static struct attribute *mdev_dev_attrs[] = {
1319 &dev_attr_memory.attr,
1323 static const struct attribute_group mdev_dev_group = {
1325 .attrs = mdev_dev_attrs,
1328 static const struct attribute_group *mdev_dev_groups[] = {
1333 static ssize_t name_show(struct mdev_type *mtype,
1334 struct mdev_type_attribute *attr, char *buf)
1336 const struct mbochs_type *type =
1337 &mbochs_types[mtype_get_type_group_id(mtype)];
1339 return sprintf(buf, "%s\n", type->name);
1341 static MDEV_TYPE_ATTR_RO(name);
1343 static ssize_t description_show(struct mdev_type *mtype,
1344 struct mdev_type_attribute *attr, char *buf)
1346 const struct mbochs_type *type =
1347 &mbochs_types[mtype_get_type_group_id(mtype)];
1349 return sprintf(buf, "virtual display, %d MB video memory\n",
1350 type ? type->mbytes : 0);
1352 static MDEV_TYPE_ATTR_RO(description);
1354 static ssize_t available_instances_show(struct mdev_type *mtype,
1355 struct mdev_type_attribute *attr,
1358 const struct mbochs_type *type =
1359 &mbochs_types[mtype_get_type_group_id(mtype)];
1360 int count = (max_mbytes - mbochs_used_mbytes) / type->mbytes;
1362 return sprintf(buf, "%d\n", count);
1364 static MDEV_TYPE_ATTR_RO(available_instances);
1366 static ssize_t device_api_show(struct mdev_type *mtype,
1367 struct mdev_type_attribute *attr, char *buf)
1369 return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
1371 static MDEV_TYPE_ATTR_RO(device_api);
1373 static struct attribute *mdev_types_attrs[] = {
1374 &mdev_type_attr_name.attr,
1375 &mdev_type_attr_description.attr,
1376 &mdev_type_attr_device_api.attr,
1377 &mdev_type_attr_available_instances.attr,
1381 static struct attribute_group mdev_type_group1 = {
1382 .name = MBOCHS_TYPE_1,
1383 .attrs = mdev_types_attrs,
1386 static struct attribute_group mdev_type_group2 = {
1387 .name = MBOCHS_TYPE_2,
1388 .attrs = mdev_types_attrs,
1391 static struct attribute_group mdev_type_group3 = {
1392 .name = MBOCHS_TYPE_3,
1393 .attrs = mdev_types_attrs,
1396 static struct attribute_group *mdev_type_groups[] = {
1403 static const struct mdev_parent_ops mdev_fops = {
1404 .owner = THIS_MODULE,
1405 .mdev_attr_groups = mdev_dev_groups,
1406 .supported_type_groups = mdev_type_groups,
1407 .create = mbochs_create,
1408 .remove = mbochs_remove,
1409 .open = mbochs_open,
1410 .release = mbochs_close,
1411 .read = mbochs_read,
1412 .write = mbochs_write,
1413 .ioctl = mbochs_ioctl,
1414 .mmap = mbochs_mmap,
1417 static const struct file_operations vd_fops = {
1418 .owner = THIS_MODULE,
1421 static void mbochs_device_release(struct device *dev)
1426 static int __init mbochs_dev_init(void)
1430 ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME);
1432 pr_err("Error: failed to register mbochs_dev, err: %d\n", ret);
1435 cdev_init(&mbochs_cdev, &vd_fops);
1436 cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1);
1437 pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt));
1439 mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME);
1440 if (IS_ERR(mbochs_class)) {
1441 pr_err("Error: failed to register mbochs_dev class\n");
1442 ret = PTR_ERR(mbochs_class);
1445 mbochs_dev.class = mbochs_class;
1446 mbochs_dev.release = mbochs_device_release;
1447 dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME);
1449 ret = device_register(&mbochs_dev);
1453 ret = mdev_register_device(&mbochs_dev, &mdev_fops);
1460 device_unregister(&mbochs_dev);
1462 class_destroy(mbochs_class);
1464 cdev_del(&mbochs_cdev);
1465 unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
1469 static void __exit mbochs_dev_exit(void)
1471 mbochs_dev.bus = NULL;
1472 mdev_unregister_device(&mbochs_dev);
1474 device_unregister(&mbochs_dev);
1475 cdev_del(&mbochs_cdev);
1476 unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
1477 class_destroy(mbochs_class);
1478 mbochs_class = NULL;
1481 module_init(mbochs_dev_init)
1482 module_exit(mbochs_dev_exit)