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/*
* Virtio GPU Device
*
* Copyright Red Hat, Inc. 2013-2014
*
* Authors:
* Dave Airlie <airlied@redhat.com>
* Gerd Hoffmann <kraxel@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qemu/units.h"
#include "qemu/iov.h"
#include "ui/console.h"
#include "hw/virtio/virtio-gpu.h"
#include "hw/virtio/virtio-gpu-pixman.h"
#include "trace.h"
#include "exec/ramblock.h"
#include "system/hostmem.h"
#include <sys/ioctl.h>
#include <linux/memfd.h>
#include "qemu/memfd.h"
#include "standard-headers/linux/udmabuf.h"
static void virtio_gpu_create_udmabuf(struct virtio_gpu_simple_resource *res)
{
struct udmabuf_create_list *list;
RAMBlock *rb;
ram_addr_t offset;
int udmabuf, i;
udmabuf = udmabuf_fd();
if (udmabuf < 0) {
return;
}
list = g_malloc0(sizeof(struct udmabuf_create_list) +
sizeof(struct udmabuf_create_item) * res->iov_cnt);
for (i = 0; i < res->iov_cnt; i++) {
rcu_read_lock();
rb = qemu_ram_block_from_host(res->iov[i].iov_base, false, &offset);
rcu_read_unlock();
if (!rb || rb->fd < 0) {
g_free(list);
return;
}
list->list[i].memfd = rb->fd;
list->list[i].offset = offset;
list->list[i].size = res->iov[i].iov_len;
}
list->count = res->iov_cnt;
list->flags = UDMABUF_FLAGS_CLOEXEC;
res->dmabuf_fd = ioctl(udmabuf, UDMABUF_CREATE_LIST, list);
if (res->dmabuf_fd < 0) {
warn_report("%s: UDMABUF_CREATE_LIST: %s", __func__,
strerror(errno));
}
g_free(list);
}
static void virtio_gpu_remap_udmabuf(struct virtio_gpu_simple_resource *res)
{
res->remapped = mmap(NULL, res->blob_size, PROT_READ,
MAP_SHARED, res->dmabuf_fd, 0);
if (res->remapped == MAP_FAILED) {
warn_report("%s: dmabuf mmap failed: %s", __func__,
strerror(errno));
res->remapped = NULL;
}
}
static void virtio_gpu_destroy_udmabuf(struct virtio_gpu_simple_resource *res)
{
if (res->remapped) {
munmap(res->remapped, res->blob_size);
res->remapped = NULL;
}
if (res->dmabuf_fd >= 0) {
close(res->dmabuf_fd);
res->dmabuf_fd = -1;
}
}
static int find_memory_backend_type(Object *obj, void *opaque)
{
bool *memfd_backend = opaque;
int ret;
if (object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)) {
HostMemoryBackend *backend = MEMORY_BACKEND(obj);
RAMBlock *rb = backend->mr.ram_block;
if (rb && rb->fd > 0) {
ret = fcntl(rb->fd, F_GET_SEALS);
if (ret > 0) {
*memfd_backend = true;
}
}
}
return 0;
}
bool virtio_gpu_have_udmabuf(void)
{
Object *memdev_root;
int udmabuf;
bool memfd_backend = false;
udmabuf = udmabuf_fd();
if (udmabuf < 0) {
return false;
}
memdev_root = object_resolve_path("/objects", NULL);
object_child_foreach(memdev_root, find_memory_backend_type, &memfd_backend);
return memfd_backend;
}
void virtio_gpu_init_udmabuf(struct virtio_gpu_simple_resource *res)
{
void *pdata = NULL;
res->dmabuf_fd = -1;
if (res->iov_cnt == 1 &&
res->iov[0].iov_len < 4096) {
pdata = res->iov[0].iov_base;
} else {
virtio_gpu_create_udmabuf(res);
if (res->dmabuf_fd < 0) {
return;
}
virtio_gpu_remap_udmabuf(res);
if (!res->remapped) {
return;
}
pdata = res->remapped;
}
res->blob = pdata;
}
void virtio_gpu_fini_udmabuf(struct virtio_gpu_simple_resource *res)
{
if (res->remapped) {
virtio_gpu_destroy_udmabuf(res);
}
}
static void virtio_gpu_free_dmabuf(VirtIOGPU *g, VGPUDMABuf *dmabuf)
{
struct virtio_gpu_scanout *scanout;
scanout = &g->parent_obj.scanout[dmabuf->scanout_id];
dpy_gl_release_dmabuf(scanout->con, dmabuf->buf);
g_clear_pointer(&dmabuf->buf, qemu_dmabuf_free);
QTAILQ_REMOVE(&g->dmabuf.bufs, dmabuf, next);
g_free(dmabuf);
}
static VGPUDMABuf
*virtio_gpu_create_dmabuf(VirtIOGPU *g,
uint32_t scanout_id,
struct virtio_gpu_simple_resource *res,
struct virtio_gpu_framebuffer *fb,
struct virtio_gpu_rect *r)
{
VGPUDMABuf *dmabuf;
if (res->dmabuf_fd < 0) {
return NULL;
}
dmabuf = g_new0(VGPUDMABuf, 1);
dmabuf->buf = qemu_dmabuf_new(r->width, r->height, fb->stride,
r->x, r->y, fb->width, fb->height,
qemu_pixman_to_drm_format(fb->format),
0, res->dmabuf_fd, true, false);
dmabuf->scanout_id = scanout_id;
QTAILQ_INSERT_HEAD(&g->dmabuf.bufs, dmabuf, next);
return dmabuf;
}
int virtio_gpu_update_dmabuf(VirtIOGPU *g,
uint32_t scanout_id,
struct virtio_gpu_simple_resource *res,
struct virtio_gpu_framebuffer *fb,
struct virtio_gpu_rect *r)
{
struct virtio_gpu_scanout *scanout = &g->parent_obj.scanout[scanout_id];
VGPUDMABuf *new_primary, *old_primary = NULL;
uint32_t width, height;
new_primary = virtio_gpu_create_dmabuf(g, scanout_id, res, fb, r);
if (!new_primary) {
return -EINVAL;
}
if (g->dmabuf.primary[scanout_id]) {
old_primary = g->dmabuf.primary[scanout_id];
}
width = qemu_dmabuf_get_width(new_primary->buf);
height = qemu_dmabuf_get_height(new_primary->buf);
g->dmabuf.primary[scanout_id] = new_primary;
qemu_console_resize(scanout->con, width, height);
dpy_gl_scanout_dmabuf(scanout->con, new_primary->buf);
if (old_primary) {
virtio_gpu_free_dmabuf(g, old_primary);
}
return 0;
}
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