drivers/staging/vboxvideo/vbox_fb.c

   1 /*
   2  * Copyright (C) 2013-2017 Oracle Corporation
   3  * This file is based on ast_fb.c
   4  * Copyright 2012 Red Hat Inc.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  18  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  19  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  20  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * The above copyright notice and this permission notice (including the
  23  * next paragraph) shall be included in all copies or substantial portions
  24  * of the Software.
  25  *
  26  * Authors: Dave Airlie <airlied@redhat.com>
  27  *          Michael Thayer <michael.thayer@oracle.com,
  28  */
  29 #include <linux/module.h>
  30 #include <linux/kernel.h>
  31 #include <linux/errno.h>
  32 #include <linux/string.h>
  33 #include <linux/mm.h>
  34 #include <linux/tty.h>
  35 #include <linux/sysrq.h>
  36 #include <linux/delay.h>
  37 #include <linux/fb.h>
  38 #include <linux/init.h>
  39
  40 #include <drm/drmP.h>
  41 #include <drm/drm_crtc.h>
  42 #include <drm/drm_fb_helper.h>
  43 #include <drm/drm_crtc_helper.h>
  44
  45 #include "vbox_drv.h"
  46 #include "vboxvideo.h"
  47
  48 #define VBOX_DIRTY_DELAY (HZ / 30)
  49 /**
  50  * Tell the host about dirty rectangles to update.
  51  */
  52 static void vbox_dirty_update(struct vbox_fbdev *fbdev,
  53                               int x, int y, int width, int height)
  54 {
  55         struct drm_gem_object *obj;
  56         struct vbox_bo *bo;
  57         int ret = -EBUSY;
  58         bool store_for_later = false;
  59         int x2, y2;
  60         unsigned long flags;
  61         struct drm_clip_rect rect;
  62
  63         obj = fbdev->afb.obj;
  64         bo = gem_to_vbox_bo(obj);
  65
  66         /*
  67          * try and reserve the BO, if we fail with busy
  68          * then the BO is being moved and we should
  69          * store up the damage until later.
  70          */
  71         if (drm_can_sleep())
  72                 ret = vbox_bo_reserve(bo, true);
  73         if (ret) {
  74                 if (ret != -EBUSY)
  75                         return;
  76
  77                 store_for_later = true;
  78         }
  79
  80         x2 = x + width - 1;
  81         y2 = y + height - 1;
  82         spin_lock_irqsave(&fbdev->dirty_lock, flags);
  83
  84         if (fbdev->y1 < y)
  85                 y = fbdev->y1;
  86         if (fbdev->y2 > y2)
  87                 y2 = fbdev->y2;
  88         if (fbdev->x1 < x)
  89                 x = fbdev->x1;
  90         if (fbdev->x2 > x2)
  91                 x2 = fbdev->x2;
  92
  93         if (store_for_later) {
  94                 fbdev->x1 = x;
  95                 fbdev->x2 = x2;
  96                 fbdev->y1 = y;
  97                 fbdev->y2 = y2;
  98                 spin_unlock_irqrestore(&fbdev->dirty_lock, flags);
  99                 return;
 100         }
 101
 102         fbdev->x1 = INT_MAX;
 103         fbdev->y1 = INT_MAX;
 104         fbdev->x2 = 0;
 105         fbdev->y2 = 0;
 106
 107         spin_unlock_irqrestore(&fbdev->dirty_lock, flags);
 108
 109         /*
 110          * Not sure why the original code subtracted 1 here, but I will keep
 111          * it that way to avoid unnecessary differences.
 112          */
 113         rect.x1 = x;
 114         rect.x2 = x2 + 1;
 115         rect.y1 = y;
 116         rect.y2 = y2 + 1;
 117         vbox_framebuffer_dirty_rectangles(&fbdev->afb.base, &rect, 1);
 118
 119         vbox_bo_unreserve(bo);
 120 }
 121
 122 #ifdef CONFIG_FB_DEFERRED_IO
 123 static void vbox_deferred_io(struct fb_info *info, struct list_head *pagelist)
 124 {
 125         struct vbox_fbdev *fbdev = info->par;
 126         unsigned long start, end, min, max;
 127         struct page *page;
 128         int y1, y2;
 129
 130         min = ULONG_MAX;
 131         max = 0;
 132         list_for_each_entry(page, pagelist, lru) {
 133                 start = page->index << PAGE_SHIFT;
 134                 end = start + PAGE_SIZE - 1;
 135                 min = min(min, start);
 136                 max = max(max, end);
 137         }
 138
 139         if (min < max) {
 140                 y1 = min / info->fix.line_length;
 141                 y2 = (max / info->fix.line_length) + 1;
 142                 DRM_INFO("%s: Calling dirty update: 0, %d, %d, %d\n",
 143                          __func__, y1, info->var.xres, y2 - y1 - 1);
 144                 vbox_dirty_update(fbdev, 0, y1, info->var.xres, y2 - y1 - 1);
 145         }
 146 }
 147
 148 static struct fb_deferred_io vbox_defio = {
 149         .delay = VBOX_DIRTY_DELAY,
 150         .deferred_io = vbox_deferred_io,
 151 };
 152 #endif
 153
 154 static void vbox_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
 155 {
 156         struct vbox_fbdev *fbdev = info->par;
 157
 158         sys_fillrect(info, rect);
 159         vbox_dirty_update(fbdev, rect->dx, rect->dy, rect->width, rect->height);
 160 }
 161
 162 static void vbox_copyarea(struct fb_info *info, const struct fb_copyarea *area)
 163 {
 164         struct vbox_fbdev *fbdev = info->par;
 165
 166         sys_copyarea(info, area);
 167         vbox_dirty_update(fbdev, area->dx, area->dy, area->width, area->height);
 168 }
 169
 170 static void vbox_imageblit(struct fb_info *info, const struct fb_image *image)
 171 {
 172         struct vbox_fbdev *fbdev = info->par;
 173
 174         sys_imageblit(info, image);
 175         vbox_dirty_update(fbdev, image->dx, image->dy, image->width,
 176                           image->height);
 177 }
 178
 179 static struct fb_ops vboxfb_ops = {
 180         .owner = THIS_MODULE,
 181         .fb_check_var = drm_fb_helper_check_var,
 182         .fb_set_par = drm_fb_helper_set_par,
 183         .fb_fillrect = vbox_fillrect,
 184         .fb_copyarea = vbox_copyarea,
 185         .fb_imageblit = vbox_imageblit,
 186         .fb_pan_display = drm_fb_helper_pan_display,
 187         .fb_blank = drm_fb_helper_blank,
 188         .fb_setcmap = drm_fb_helper_setcmap,
 189         .fb_debug_enter = drm_fb_helper_debug_enter,
 190         .fb_debug_leave = drm_fb_helper_debug_leave,
 191 };
 192
 193 static int vboxfb_create_object(struct vbox_fbdev *fbdev,
 194                                 struct DRM_MODE_FB_CMD *mode_cmd,
 195                                 struct drm_gem_object **gobj_p)
 196 {
 197         struct drm_device *dev = fbdev->helper.dev;
 198         u32 size;
 199         struct drm_gem_object *gobj;
 200         u32 pitch = mode_cmd->pitches[0];
 201         int ret;
 202
 203         size = pitch * mode_cmd->height;
 204         ret = vbox_gem_create(dev, size, true, &gobj);
 205         if (ret)
 206                 return ret;
 207
 208         *gobj_p = gobj;
 209
 210         return 0;
 211 }
 212
 213 static int vboxfb_create(struct drm_fb_helper *helper,
 214                          struct drm_fb_helper_surface_size *sizes)
 215 {
 216         struct vbox_fbdev *fbdev =
 217             container_of(helper, struct vbox_fbdev, helper);
 218         struct drm_device *dev = fbdev->helper.dev;
 219         struct DRM_MODE_FB_CMD mode_cmd;
 220         struct drm_framebuffer *fb;
 221         struct fb_info *info;
 222         struct device *device = &dev->pdev->dev;
 223         struct drm_gem_object *gobj;
 224         struct vbox_bo *bo;
 225         int size, ret;
 226         u32 pitch;
 227
 228         mode_cmd.width = sizes->surface_width;
 229         mode_cmd.height = sizes->surface_height;
 230         pitch = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 231         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 232                                                           sizes->surface_depth);
 233         mode_cmd.pitches[0] = pitch;
 234
 235         size = pitch * mode_cmd.height;
 236
 237         ret = vboxfb_create_object(fbdev, &mode_cmd, &gobj);
 238         if (ret) {
 239                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 240                 return ret;
 241         }
 242
 243         ret = vbox_framebuffer_init(dev, &fbdev->afb, &mode_cmd, gobj);
 244         if (ret)
 245                 return ret;
 246
 247         bo = gem_to_vbox_bo(gobj);
 248
 249         ret = vbox_bo_reserve(bo, false);
 250         if (ret)
 251                 return ret;
 252
 253         ret = vbox_bo_pin(bo, TTM_PL_FLAG_VRAM, NULL);
 254         if (ret) {
 255                 vbox_bo_unreserve(bo);
 256                 return ret;
 257         }
 258
 259         ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
 260         vbox_bo_unreserve(bo);
 261         if (ret) {
 262                 DRM_ERROR("failed to kmap fbcon\n");
 263                 return ret;
 264         }
 265
 266         info = framebuffer_alloc(0, device);
 267         if (!info)
 268                 return -ENOMEM;
 269         info->par = fbdev;
 270
 271         fbdev->size = size;
 272
 273         fb = &fbdev->afb.base;
 274         fbdev->helper.fb = fb;
 275         fbdev->helper.fbdev = info;
 276
 277         strcpy(info->fix.id, "vboxdrmfb");
 278
 279         /*
 280          * The last flag forces a mode set on VT switches even if the kernel
 281          * does not think it is needed.
 282          */
 283         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT |
 284                       FBINFO_MISC_ALWAYS_SETPAR;
 285         info->fbops = &vboxfb_ops;
 286
 287         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 288         if (ret)
 289                 return -ENOMEM;
 290
 291         /*
 292          * This seems to be done for safety checking that the framebuffer
 293          * is not registered twice by different drivers.
 294          */
 295         info->apertures = alloc_apertures(1);
 296         if (!info->apertures)
 297                 return -ENOMEM;
 298         info->apertures->ranges[0].base = pci_resource_start(dev->pdev, 0);
 299         info->apertures->ranges[0].size = pci_resource_len(dev->pdev, 0);
 300
 301         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
 302         drm_fb_helper_fill_var(info, &fbdev->helper, sizes->fb_width,
 303                                sizes->fb_height);
 304
 305         info->screen_base = bo->kmap.virtual;
 306         info->screen_size = size;
 307
 308 #ifdef CONFIG_FB_DEFERRED_IO
 309         info->fbdefio = &vbox_defio;
 310         fb_deferred_io_init(info);
 311 #endif
 312
 313         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 314
 315         DRM_DEBUG_KMS("allocated %dx%d\n", fb->width, fb->height);
 316
 317         return 0;
 318 }
 319
 320 static void vbox_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 321                               u16 blue, int regno)
 322 {
 323 }
 324
 325 static void vbox_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 326                               u16 *blue, int regno)
 327 {
 328         *red = regno;
 329         *green = regno;
 330         *blue = regno;
 331 }
 332
 333 static struct drm_fb_helper_funcs vbox_fb_helper_funcs = {
 334         .gamma_set = vbox_fb_gamma_set,
 335         .gamma_get = vbox_fb_gamma_get,
 336         .fb_probe = vboxfb_create,
 337 };
 338
 339 void vbox_fbdev_fini(struct drm_device *dev)
 340 {
 341         struct vbox_private *vbox = dev->dev_private;
 342         struct vbox_fbdev *fbdev = vbox->fbdev;
 343         struct vbox_framebuffer *afb = &fbdev->afb;
 344
 345         drm_fb_helper_unregister_fbi(&fbdev->helper);
 346
 347         if (afb->obj) {
 348                 struct vbox_bo *bo = gem_to_vbox_bo(afb->obj);
 349
 350                 if (!vbox_bo_reserve(bo, false)) {
 351                         if (bo->kmap.virtual)
 352                                 ttm_bo_kunmap(&bo->kmap);
 353                         /*
 354                          * QXL does this, but is it really needed before
 355                          * freeing?
 356                          */
 357                         if (bo->pin_count)
 358                                 vbox_bo_unpin(bo);
 359                         vbox_bo_unreserve(bo);
 360                 }
 361                 drm_gem_object_unreference_unlocked(afb->obj);
 362                 afb->obj = NULL;
 363         }
 364         drm_fb_helper_fini(&fbdev->helper);
 365
 366         drm_framebuffer_unregister_private(&afb->base);
 367         drm_framebuffer_cleanup(&afb->base);
 368 }
 369
 370 int vbox_fbdev_init(struct drm_device *dev)
 371 {
 372         struct vbox_private *vbox = dev->dev_private;
 373         struct vbox_fbdev *fbdev;
 374         int ret;
 375
 376         fbdev = devm_kzalloc(dev->dev, sizeof(*fbdev), GFP_KERNEL);
 377         if (!fbdev)
 378                 return -ENOMEM;
 379
 380         vbox->fbdev = fbdev;
 381         spin_lock_init(&fbdev->dirty_lock);
 382
 383         drm_fb_helper_prepare(dev, &fbdev->helper, &vbox_fb_helper_funcs);
 384         ret = drm_fb_helper_init(dev, &fbdev->helper, vbox->num_crtcs);
 385         if (ret)
 386                 return ret;
 387
 388         ret = drm_fb_helper_single_add_all_connectors(&fbdev->helper);
 389         if (ret)
 390                 goto err_fini;
 391
 392         /* disable all the possible outputs/crtcs before entering KMS mode */
 393         drm_helper_disable_unused_functions(dev);
 394
 395         ret = drm_fb_helper_initial_config(&fbdev->helper, 32);
 396         if (ret)
 397                 goto err_fini;
 398
 399         return 0;
 400
 401 err_fini:
 402         drm_fb_helper_fini(&fbdev->helper);
 403         return ret;
 404 }
 405
 406 void vbox_fbdev_set_base(struct vbox_private *vbox, unsigned long gpu_addr)
 407 {
 408         struct fb_info *fbdev = vbox->fbdev->helper.fbdev;
 409
 410         fbdev->fix.smem_start = fbdev->apertures->ranges[0].base + gpu_addr;
 411         fbdev->fix.smem_len = vbox->available_vram_size - gpu_addr;
 412 }