drivers/gpu/drm/virtio/virtgpu_fb.c

   1 /*
   2  * Copyright (C) 2015 Red Hat, Inc.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining
   6  * a copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sublicense, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial
  15  * portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  21  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 #include <drm/drmP.h>
  27 #include <drm/drm_fb_helper.h>
  28 #include "virtgpu_drv.h"
  29
  30 #define VIRTIO_GPU_FBCON_POLL_PERIOD (HZ / 60)
  31
  32 struct virtio_gpu_fbdev {
  33         struct drm_fb_helper           helper;
  34         struct virtio_gpu_framebuffer  vgfb;
  35         struct virtio_gpu_device       *vgdev;
  36         struct delayed_work            work;
  37 };
  38
  39 static int virtio_gpu_dirty_update(struct virtio_gpu_framebuffer *fb,
  40                                    bool store, int x, int y,
  41                                    int width, int height)
  42 {
  43         struct drm_device *dev = fb->base.dev;
  44         struct virtio_gpu_device *vgdev = dev->dev_private;
  45         bool store_for_later = false;
  46         int bpp = fb->base.format->cpp[0];
  47         int x2, y2;
  48         unsigned long flags;
  49         struct virtio_gpu_object *obj = gem_to_virtio_gpu_obj(fb->obj);
  50
  51         if ((width <= 0) ||
  52             (x + width > fb->base.width) ||
  53             (y + height > fb->base.height)) {
  54                 DRM_DEBUG("values out of range %dx%d+%d+%d, fb %dx%d\n",
  55                           width, height, x, y,
  56                           fb->base.width, fb->base.height);
  57                 return -EINVAL;
  58         }
  59
  60         /*
  61          * Can be called with pretty much any context (console output
  62          * path).  If we are in atomic just store the dirty rect info
  63          * to send out the update later.
  64          *
  65          * Can't test inside spin lock.
  66          */
  67         if (in_atomic() || store)
  68                 store_for_later = true;
  69
  70         x2 = x + width - 1;
  71         y2 = y + height - 1;
  72
  73         spin_lock_irqsave(&fb->dirty_lock, flags);
  74
  75         if (fb->y1 < y)
  76                 y = fb->y1;
  77         if (fb->y2 > y2)
  78                 y2 = fb->y2;
  79         if (fb->x1 < x)
  80                 x = fb->x1;
  81         if (fb->x2 > x2)
  82                 x2 = fb->x2;
  83
  84         if (store_for_later) {
  85                 fb->x1 = x;
  86                 fb->x2 = x2;
  87                 fb->y1 = y;
  88                 fb->y2 = y2;
  89                 spin_unlock_irqrestore(&fb->dirty_lock, flags);
  90                 return 0;
  91         }
  92
  93         fb->x1 = fb->y1 = INT_MAX;
  94         fb->x2 = fb->y2 = 0;
  95
  96         spin_unlock_irqrestore(&fb->dirty_lock, flags);
  97
  98         {
  99                 uint32_t offset;
 100                 uint32_t w = x2 - x + 1;
 101                 uint32_t h = y2 - y + 1;
 102
 103                 offset = (y * fb->base.pitches[0]) + x * bpp;
 104
 105                 virtio_gpu_cmd_transfer_to_host_2d(vgdev, obj->hw_res_handle,
 106                                                    offset,
 107                                                    cpu_to_le32(w),
 108                                                    cpu_to_le32(h),
 109                                                    cpu_to_le32(x),
 110                                                    cpu_to_le32(y),
 111                                                    NULL);
 112
 113         }
 114         virtio_gpu_cmd_resource_flush(vgdev, obj->hw_res_handle,
 115                                       x, y, x2 - x + 1, y2 - y + 1);
 116         return 0;
 117 }
 118
 119 int virtio_gpu_surface_dirty(struct virtio_gpu_framebuffer *vgfb,
 120                              struct drm_clip_rect *clips,
 121                              unsigned num_clips)
 122 {
 123         struct virtio_gpu_device *vgdev = vgfb->base.dev->dev_private;
 124         struct virtio_gpu_object *obj = gem_to_virtio_gpu_obj(vgfb->obj);
 125         struct drm_clip_rect norect;
 126         struct drm_clip_rect *clips_ptr;
 127         int left, right, top, bottom;
 128         int i;
 129         int inc = 1;
 130         if (!num_clips) {
 131                 num_clips = 1;
 132                 clips = &norect;
 133                 norect.x1 = norect.y1 = 0;
 134                 norect.x2 = vgfb->base.width;
 135                 norect.y2 = vgfb->base.height;
 136         }
 137         left = clips->x1;
 138         right = clips->x2;
 139         top = clips->y1;
 140         bottom = clips->y2;
 141
 142         /* skip the first clip rect */
 143         for (i = 1, clips_ptr = clips + inc;
 144              i < num_clips; i++, clips_ptr += inc) {
 145                 left = min_t(int, left, (int)clips_ptr->x1);
 146                 right = max_t(int, right, (int)clips_ptr->x2);
 147                 top = min_t(int, top, (int)clips_ptr->y1);
 148                 bottom = max_t(int, bottom, (int)clips_ptr->y2);
 149         }
 150
 151         if (obj->dumb)
 152                 return virtio_gpu_dirty_update(vgfb, false, left, top,
 153                                                right - left, bottom - top);
 154
 155         virtio_gpu_cmd_resource_flush(vgdev, obj->hw_res_handle,
 156                                       left, top, right - left, bottom - top);
 157         return 0;
 158 }
 159
 160 static void virtio_gpu_fb_dirty_work(struct work_struct *work)
 161 {
 162         struct delayed_work *delayed_work = to_delayed_work(work);
 163         struct virtio_gpu_fbdev *vfbdev =
 164                 container_of(delayed_work, struct virtio_gpu_fbdev, work);
 165         struct virtio_gpu_framebuffer *vgfb = &vfbdev->vgfb;
 166
 167         virtio_gpu_dirty_update(&vfbdev->vgfb, false, vgfb->x1, vgfb->y1,
 168                                 vgfb->x2 - vgfb->x1, vgfb->y2 - vgfb->y1);
 169 }
 170
 171 static void virtio_gpu_3d_fillrect(struct fb_info *info,
 172                                    const struct fb_fillrect *rect)
 173 {
 174         struct virtio_gpu_fbdev *vfbdev = info->par;
 175         drm_fb_helper_sys_fillrect(info, rect);
 176         virtio_gpu_dirty_update(&vfbdev->vgfb, true, rect->dx, rect->dy,
 177                              rect->width, rect->height);
 178         schedule_delayed_work(&vfbdev->work, VIRTIO_GPU_FBCON_POLL_PERIOD);
 179 }
 180
 181 static void virtio_gpu_3d_copyarea(struct fb_info *info,
 182                                    const struct fb_copyarea *area)
 183 {
 184         struct virtio_gpu_fbdev *vfbdev = info->par;
 185         drm_fb_helper_sys_copyarea(info, area);
 186         virtio_gpu_dirty_update(&vfbdev->vgfb, true, area->dx, area->dy,
 187                            area->width, area->height);
 188         schedule_delayed_work(&vfbdev->work, VIRTIO_GPU_FBCON_POLL_PERIOD);
 189 }
 190
 191 static void virtio_gpu_3d_imageblit(struct fb_info *info,
 192                                     const struct fb_image *image)
 193 {
 194         struct virtio_gpu_fbdev *vfbdev = info->par;
 195         drm_fb_helper_sys_imageblit(info, image);
 196         virtio_gpu_dirty_update(&vfbdev->vgfb, true, image->dx, image->dy,
 197                              image->width, image->height);
 198         schedule_delayed_work(&vfbdev->work, VIRTIO_GPU_FBCON_POLL_PERIOD);
 199 }
 200
 201 static struct fb_ops virtio_gpufb_ops = {
 202         .owner = THIS_MODULE,
 203         DRM_FB_HELPER_DEFAULT_OPS,
 204         .fb_fillrect = virtio_gpu_3d_fillrect,
 205         .fb_copyarea = virtio_gpu_3d_copyarea,
 206         .fb_imageblit = virtio_gpu_3d_imageblit,
 207 };
 208
 209 static int virtio_gpu_vmap_fb(struct virtio_gpu_device *vgdev,
 210                               struct virtio_gpu_object *obj)
 211 {
 212         return virtio_gpu_object_kmap(obj, NULL);
 213 }
 214
 215 static int virtio_gpufb_create(struct drm_fb_helper *helper,
 216                                struct drm_fb_helper_surface_size *sizes)
 217 {
 218         struct virtio_gpu_fbdev *vfbdev =
 219                 container_of(helper, struct virtio_gpu_fbdev, helper);
 220         struct drm_device *dev = helper->dev;
 221         struct virtio_gpu_device *vgdev = dev->dev_private;
 222         struct fb_info *info;
 223         struct drm_framebuffer *fb;
 224         struct drm_mode_fb_cmd2 mode_cmd = {};
 225         struct virtio_gpu_object *obj;
 226         uint32_t resid, format, size;
 227         int ret;
 228
 229         mode_cmd.width = sizes->surface_width;
 230         mode_cmd.height = sizes->surface_height;
 231         mode_cmd.pitches[0] = mode_cmd.width * 4;
 232         mode_cmd.pixel_format = drm_mode_legacy_fb_format(32, 24);
 233
 234         format = virtio_gpu_translate_format(mode_cmd.pixel_format);
 235         if (format == 0)
 236                 return -EINVAL;
 237
 238         size = mode_cmd.pitches[0] * mode_cmd.height;
 239         obj = virtio_gpu_alloc_object(dev, size, false, true);
 240         if (IS_ERR(obj))
 241                 return PTR_ERR(obj);
 242
 243         virtio_gpu_resource_id_get(vgdev, &resid);
 244         virtio_gpu_cmd_create_resource(vgdev, resid, format,
 245                                        mode_cmd.width, mode_cmd.height);
 246
 247         ret = virtio_gpu_vmap_fb(vgdev, obj);
 248         if (ret) {
 249                 DRM_ERROR("failed to vmap fb %d\n", ret);
 250                 goto err_obj_vmap;
 251         }
 252
 253         /* attach the object to the resource */
 254         ret = virtio_gpu_object_attach(vgdev, obj, resid, NULL);
 255         if (ret)
 256                 goto err_obj_attach;
 257
 258         info = drm_fb_helper_alloc_fbi(helper);
 259         if (IS_ERR(info)) {
 260                 ret = PTR_ERR(info);
 261                 goto err_fb_alloc;
 262         }
 263
 264         info->par = helper;
 265
 266         ret = virtio_gpu_framebuffer_init(dev, &vfbdev->vgfb,
 267                                           &mode_cmd, &obj->gem_base);
 268         if (ret)
 269                 goto err_fb_alloc;
 270
 271         fb = &vfbdev->vgfb.base;
 272
 273         vfbdev->helper.fb = fb;
 274
 275         strcpy(info->fix.id, "virtiodrmfb");
 276         info->flags = FBINFO_DEFAULT;
 277         info->fbops = &virtio_gpufb_ops;
 278         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 279
 280         info->screen_buffer = obj->vmap;
 281         info->screen_size = obj->gem_base.size;
 282         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
 283         drm_fb_helper_fill_var(info, &vfbdev->helper,
 284                                sizes->fb_width, sizes->fb_height);
 285
 286         info->fix.mmio_start = 0;
 287         info->fix.mmio_len = 0;
 288         return 0;
 289
 290 err_fb_alloc:
 291         virtio_gpu_cmd_resource_inval_backing(vgdev, resid);
 292 err_obj_attach:
 293 err_obj_vmap:
 294         virtio_gpu_gem_free_object(&obj->gem_base);
 295         return ret;
 296 }
 297
 298 static int virtio_gpu_fbdev_destroy(struct drm_device *dev,
 299                                     struct virtio_gpu_fbdev *vgfbdev)
 300 {
 301         struct virtio_gpu_framebuffer *vgfb = &vgfbdev->vgfb;
 302
 303         drm_fb_helper_unregister_fbi(&vgfbdev->helper);
 304
 305         if (vgfb->obj)
 306                 vgfb->obj = NULL;
 307         drm_fb_helper_fini(&vgfbdev->helper);
 308         drm_framebuffer_cleanup(&vgfb->base);
 309
 310         return 0;
 311 }
 312 static struct drm_fb_helper_funcs virtio_gpu_fb_helper_funcs = {
 313         .fb_probe = virtio_gpufb_create,
 314 };
 315
 316 int virtio_gpu_fbdev_init(struct virtio_gpu_device *vgdev)
 317 {
 318         struct virtio_gpu_fbdev *vgfbdev;
 319         int bpp_sel = 32; /* TODO: parameter from somewhere? */
 320         int ret;
 321
 322         vgfbdev = kzalloc(sizeof(struct virtio_gpu_fbdev), GFP_KERNEL);
 323         if (!vgfbdev)
 324                 return -ENOMEM;
 325
 326         vgfbdev->vgdev = vgdev;
 327         vgdev->vgfbdev = vgfbdev;
 328         INIT_DELAYED_WORK(&vgfbdev->work, virtio_gpu_fb_dirty_work);
 329
 330         drm_fb_helper_prepare(vgdev->ddev, &vgfbdev->helper,
 331                               &virtio_gpu_fb_helper_funcs);
 332         ret = drm_fb_helper_init(vgdev->ddev, &vgfbdev->helper,
 333                                  VIRTIO_GPUFB_CONN_LIMIT);
 334         if (ret) {
 335                 kfree(vgfbdev);
 336                 return ret;
 337         }
 338
 339         drm_fb_helper_single_add_all_connectors(&vgfbdev->helper);
 340         drm_fb_helper_initial_config(&vgfbdev->helper, bpp_sel);
 341         return 0;
 342 }
 343
 344 void virtio_gpu_fbdev_fini(struct virtio_gpu_device *vgdev)
 345 {
 346         if (!vgdev->vgfbdev)
 347                 return;
 348
 349         virtio_gpu_fbdev_destroy(vgdev->ddev, vgdev->vgfbdev);
 350         kfree(vgdev->vgfbdev);
 351         vgdev->vgfbdev = NULL;
 352 }