| 1 | /* |
| 2 | * Virtio GPU Device |
| 3 | * |
| 4 | * Copyright Red Hat, Inc. 2013-2014 |
| 5 | * |
| 6 | * Authors: |
| 7 | * Dave Airlie <airlied@redhat.com> |
| 8 | * Gerd Hoffmann <kraxel@redhat.com> |
| 9 | * |
| 10 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 11 | * See the COPYING file in the top-level directory. |
| 12 | */ |
| 13 | |
| 14 | #include "qemu/osdep.h" |
| 15 | #include "qemu/error-report.h" |
| 16 | #include "qemu/units.h" |
| 17 | #include "qemu/iov.h" |
| 18 | #include "ui/console.h" |
| 19 | #include "hw/virtio/virtio-gpu.h" |
| 20 | #include "hw/virtio/virtio-gpu-pixman.h" |
| 21 | #include "trace.h" |
| 22 | #include "system/ramblock.h" |
| 23 | #include "system/hostmem.h" |
| 24 | #include <sys/ioctl.h> |
| 25 | #include <linux/memfd.h> |
| 26 | #include "qemu/memfd.h" |
| 27 | #include "standard-headers/linux/udmabuf.h" |
| 28 | #include "standard-headers/drm/drm_fourcc.h" |
| 29 | |
| 30 | static void virtio_gpu_create_udmabuf(struct virtio_gpu_simple_resource *res) |
| 31 | { |
| 32 | struct udmabuf_create_list *list; |
| 33 | RAMBlock *rb; |
| 34 | ram_addr_t offset; |
| 35 | int udmabuf, i; |
| 36 | |
| 37 | udmabuf = udmabuf_fd(); |
| 38 | if (udmabuf < 0) { |
| 39 | return; |
| 40 | } |
| 41 | |
| 42 | list = g_try_malloc0(sizeof(struct udmabuf_create_list) + |
| 43 | sizeof(struct udmabuf_create_item) * res->iov_cnt); |
| 44 | if (!list) { |
| 45 | return; |
| 46 | } |
| 47 | |
| 48 | for (i = 0; i < res->iov_cnt; i++) { |
| 49 | rcu_read_lock(); |
| 50 | rb = qemu_ram_block_from_host(res->iov[i].iov_base, false, &offset); |
| 51 | rcu_read_unlock(); |
| 52 | |
| 53 | if (!rb || rb->fd < 0) { |
| 54 | g_free(list); |
| 55 | return; |
| 56 | } |
| 57 | |
| 58 | list->list[i].memfd = rb->fd; |
| 59 | list->list[i].offset = offset; |
| 60 | list->list[i].size = res->iov[i].iov_len; |
| 61 | } |
| 62 | |
| 63 | list->count = res->iov_cnt; |
| 64 | list->flags = UDMABUF_FLAGS_CLOEXEC; |
| 65 | |
| 66 | res->dmabuf_fd = ioctl(udmabuf, UDMABUF_CREATE_LIST, list); |
| 67 | if (res->dmabuf_fd < 0) { |
| 68 | warn_report("%s: UDMABUF_CREATE_LIST: %s", __func__, |
| 69 | strerror(errno)); |
| 70 | } |
| 71 | g_free(list); |
| 72 | } |
| 73 | |
| 74 | static void virtio_gpu_remap_udmabuf(struct virtio_gpu_simple_resource *res) |
| 75 | { |
| 76 | res->remapped = mmap(NULL, res->blob_size, PROT_READ, |
| 77 | MAP_SHARED, res->dmabuf_fd, 0); |
| 78 | if (res->remapped == MAP_FAILED) { |
| 79 | warn_report("%s: dmabuf mmap failed: %s", __func__, |
| 80 | strerror(errno)); |
| 81 | res->remapped = NULL; |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | static void virtio_gpu_destroy_udmabuf(struct virtio_gpu_simple_resource *res) |
| 86 | { |
| 87 | if (res->remapped) { |
| 88 | munmap(res->remapped, res->blob_size); |
| 89 | res->remapped = NULL; |
| 90 | } |
| 91 | if (res->dmabuf_fd >= 0) { |
| 92 | close(res->dmabuf_fd); |
| 93 | res->dmabuf_fd = -1; |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | static int find_memory_backend_type(Object *obj, void *opaque) |
| 98 | { |
| 99 | bool *memfd_backend = opaque; |
| 100 | int ret; |
| 101 | |
| 102 | if (object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)) { |
| 103 | HostMemoryBackend *backend = MEMORY_BACKEND(obj); |
| 104 | RAMBlock *rb = backend->mr.ram_block; |
| 105 | |
| 106 | if (rb && rb->fd > 0) { |
| 107 | ret = fcntl(rb->fd, F_GET_SEALS); |
| 108 | if (ret > 0) { |
| 109 | *memfd_backend = true; |
| 110 | } |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | bool virtio_gpu_have_udmabuf(void) |
| 118 | { |
| 119 | Object *memdev_root; |
| 120 | int udmabuf; |
| 121 | bool memfd_backend = false; |
| 122 | |
| 123 | udmabuf = udmabuf_fd(); |
| 124 | if (udmabuf < 0) { |
| 125 | return false; |
| 126 | } |
| 127 | |
| 128 | memdev_root = object_resolve_path("/objects", NULL); |
| 129 | object_child_foreach(memdev_root, find_memory_backend_type, &memfd_backend); |
| 130 | |
| 131 | return memfd_backend; |
| 132 | } |
| 133 | |
| 134 | bool virtio_gpu_init_udmabuf(struct virtio_gpu_simple_resource *res) |
| 135 | { |
| 136 | void *pdata = NULL; |
| 137 | |
| 138 | res->dmabuf_fd = -1; |
| 139 | if (res->iov_cnt == 1 && |
| 140 | res->iov[0].iov_len < 4096) { |
| 141 | pdata = res->iov[0].iov_base; |
| 142 | } else if (res->blob_size) { |
| 143 | virtio_gpu_create_udmabuf(res); |
| 144 | if (res->dmabuf_fd < 0) { |
| 145 | return false; |
| 146 | } |
| 147 | virtio_gpu_remap_udmabuf(res); |
| 148 | if (!res->remapped) { |
| 149 | virtio_gpu_destroy_udmabuf(res); |
| 150 | return false; |
| 151 | } |
| 152 | pdata = res->remapped; |
| 153 | } |
| 154 | |
| 155 | res->blob = pdata; |
| 156 | |
| 157 | return true; |
| 158 | } |
| 159 | |
| 160 | static void virtio_gpu_free_dmabuf(VirtIOGPU *g, VGPUDMABuf *dmabuf) |
| 161 | { |
| 162 | struct virtio_gpu_scanout *scanout; |
| 163 | |
| 164 | scanout = &g->parent_obj.scanout[dmabuf->scanout_id]; |
| 165 | qemu_console_gl_release_dmabuf(scanout->con, dmabuf->buf); |
| 166 | g_clear_pointer(&dmabuf->buf, qemu_dmabuf_free); |
| 167 | QTAILQ_REMOVE(&g->dmabuf.bufs, dmabuf, next); |
| 168 | g_free(dmabuf); |
| 169 | } |
| 170 | |
| 171 | void virtio_gpu_fini_udmabuf(VirtIOGPU *g, struct virtio_gpu_simple_resource *res) |
| 172 | { |
| 173 | int max_outputs = g->parent_obj.conf.max_outputs; |
| 174 | int i; |
| 175 | |
| 176 | for (i = 0; i < max_outputs; i++) { |
| 177 | VGPUDMABuf *dmabuf = g->dmabuf.primary[i]; |
| 178 | |
| 179 | if (dmabuf && |
| 180 | qemu_dmabuf_get_num_planes(dmabuf->buf) > 0 && |
| 181 | qemu_dmabuf_get_fds(dmabuf->buf, NULL)[0] == res->dmabuf_fd && |
| 182 | res->dmabuf_fd != -1) { |
| 183 | qemu_dmabuf_close(dmabuf->buf); |
| 184 | res->dmabuf_fd = -1; |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | virtio_gpu_destroy_udmabuf(res); |
| 189 | } |
| 190 | |
| 191 | static VGPUDMABuf |
| 192 | *virtio_gpu_create_dmabuf(VirtIOGPU *g, |
| 193 | uint32_t scanout_id, |
| 194 | struct virtio_gpu_simple_resource *res, |
| 195 | struct virtio_gpu_framebuffer *fb, |
| 196 | struct virtio_gpu_rect *r) |
| 197 | { |
| 198 | VGPUDMABuf *dmabuf; |
| 199 | uint32_t offset = 0; |
| 200 | |
| 201 | if (res->dmabuf_fd < 0) { |
| 202 | return NULL; |
| 203 | } |
| 204 | |
| 205 | dmabuf = g_new0(VGPUDMABuf, 1); |
| 206 | dmabuf->buf = qemu_dmabuf_new(r->width, r->height, |
| 207 | &offset, &fb->stride, |
| 208 | r->x, r->y, fb->width, fb->height, |
| 209 | qemu_pixman_to_drm_format(fb->format), |
| 210 | DRM_FORMAT_MOD_INVALID, &res->dmabuf_fd, |
| 211 | 1, true, false); |
| 212 | dmabuf->scanout_id = scanout_id; |
| 213 | QTAILQ_INSERT_HEAD(&g->dmabuf.bufs, dmabuf, next); |
| 214 | |
| 215 | return dmabuf; |
| 216 | } |
| 217 | |
| 218 | int virtio_gpu_update_dmabuf(VirtIOGPU *g, |
| 219 | uint32_t scanout_id, |
| 220 | struct virtio_gpu_simple_resource *res, |
| 221 | struct virtio_gpu_framebuffer *fb, |
| 222 | struct virtio_gpu_rect *r) |
| 223 | { |
| 224 | struct virtio_gpu_scanout *scanout = &g->parent_obj.scanout[scanout_id]; |
| 225 | VGPUDMABuf *new_primary, *old_primary = NULL; |
| 226 | uint32_t width, height; |
| 227 | |
| 228 | new_primary = virtio_gpu_create_dmabuf(g, scanout_id, res, fb, r); |
| 229 | if (!new_primary) { |
| 230 | return -EINVAL; |
| 231 | } |
| 232 | |
| 233 | if (g->dmabuf.primary[scanout_id]) { |
| 234 | old_primary = g->dmabuf.primary[scanout_id]; |
| 235 | } |
| 236 | |
| 237 | width = qemu_dmabuf_get_width(new_primary->buf); |
| 238 | height = qemu_dmabuf_get_height(new_primary->buf); |
| 239 | g->dmabuf.primary[scanout_id] = new_primary; |
| 240 | qemu_console_resize(scanout->con, width, height); |
| 241 | qemu_console_gl_scanout_dmabuf(scanout->con, new_primary->buf); |
| 242 | |
| 243 | if (old_primary) { |
| 244 | virtio_gpu_free_dmabuf(g, old_primary); |
| 245 | } |
| 246 | |
| 247 | return 0; |
| 248 | } |