drivers/gpu/drm/i915/intel_fbdev.c

   1 /*
   2  * Copyright © 2007 David Airlie
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *     David Airlie
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/errno.h>
  30 #include <linux/string.h>
  31 #include <linux/mm.h>
  32 #include <linux/tty.h>
  33 #include <linux/sysrq.h>
  34 #include <linux/delay.h>
  35 #include <linux/fb.h>
  36 #include <linux/init.h>
  37 #include <linux/vga_switcheroo.h>
  38
  39 #include <drm/drmP.h>
  40 #include <drm/drm_crtc.h>
  41 #include <drm/drm_fb_helper.h>
  42 #include "intel_drv.h"
  43 #include <drm/i915_drm.h>
  44 #include "i915_drv.h"
  45
  46 static struct fb_ops intelfb_ops = {
  47         .owner = THIS_MODULE,
  48         .fb_check_var = drm_fb_helper_check_var,
  49         .fb_set_par = drm_fb_helper_set_par,
  50         .fb_fillrect = cfb_fillrect,
  51         .fb_copyarea = cfb_copyarea,
  52         .fb_imageblit = cfb_imageblit,
  53         .fb_pan_display = drm_fb_helper_pan_display,
  54         .fb_blank = drm_fb_helper_blank,
  55         .fb_setcmap = drm_fb_helper_setcmap,
  56         .fb_debug_enter = drm_fb_helper_debug_enter,
  57         .fb_debug_leave = drm_fb_helper_debug_leave,
  58 };
  59
  60 static int intelfb_alloc(struct drm_fb_helper *helper,
  61                          struct drm_fb_helper_surface_size *sizes)
  62 {
  63         struct intel_fbdev *ifbdev =
  64                 container_of(helper, struct intel_fbdev, helper);
  65         struct drm_device *dev = helper->dev;
  66         struct drm_mode_fb_cmd2 mode_cmd = {};
  67         struct drm_i915_gem_object *obj;
  68         int size, ret;
  69
  70         /* we don't do packed 24bpp */
  71         if (sizes->surface_bpp == 24)
  72                 sizes->surface_bpp = 32;
  73
  74         mode_cmd.width = sizes->surface_width;
  75         mode_cmd.height = sizes->surface_height;
  76
  77         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
  78                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
  79         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  80                                                           sizes->surface_depth);
  81
  82         size = mode_cmd.pitches[0] * mode_cmd.height;
  83         size = ALIGN(size, PAGE_SIZE);
  84         obj = i915_gem_object_create_stolen(dev, size);
  85         if (obj == NULL)
  86                 obj = i915_gem_alloc_object(dev, size);
  87         if (!obj) {
  88                 DRM_ERROR("failed to allocate framebuffer\n");
  89                 ret = -ENOMEM;
  90                 goto out;
  91         }
  92
  93         /* Flush everything out, we'll be doing GTT only from now on */
  94         ret = intel_pin_and_fence_fb_obj(dev, obj, NULL);
  95         if (ret) {
  96                 DRM_ERROR("failed to pin fb: %d\n", ret);
  97                 goto out_unref;
  98         }
  99
 100         ret = intel_framebuffer_init(dev, &ifbdev->ifb, &mode_cmd, obj);
 101         if (ret)
 102                 goto out_unpin;
 103
 104         return 0;
 105
 106 out_unpin:
 107         i915_gem_object_unpin(obj);
 108 out_unref:
 109         drm_gem_object_unreference(&obj->base);
 110 out:
 111         return ret;
 112 }
 113
 114 static int intelfb_create(struct drm_fb_helper *helper,
 115                           struct drm_fb_helper_surface_size *sizes)
 116 {
 117         struct intel_fbdev *ifbdev =
 118                 container_of(helper, struct intel_fbdev, helper);
 119         struct intel_framebuffer *intel_fb = &ifbdev->ifb;
 120         struct drm_device *dev = helper->dev;
 121         struct drm_i915_private *dev_priv = dev->dev_private;
 122         struct fb_info *info;
 123         struct drm_framebuffer *fb;
 124         struct drm_i915_gem_object *obj;
 125         int size, ret;
 126
 127         mutex_lock(&dev->struct_mutex);
 128
 129         if (!intel_fb->obj) {
 130                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 131                 ret = intelfb_alloc(helper, sizes);
 132                 if (ret)
 133                         goto out_unlock;
 134         } else {
 135                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 136                 sizes->fb_width = intel_fb->base.width;
 137                 sizes->fb_height = intel_fb->base.height;
 138         }
 139
 140         obj = intel_fb->obj;
 141         size = obj->base.size;
 142
 143         info = framebuffer_alloc(0, &dev->pdev->dev);
 144         if (!info) {
 145                 ret = -ENOMEM;
 146                 goto out_unpin;
 147         }
 148
 149         info->par = helper;
 150
 151         fb = &ifbdev->ifb.base;
 152
 153         ifbdev->helper.fb = fb;
 154         ifbdev->helper.fbdev = info;
 155
 156         strcpy(info->fix.id, "inteldrmfb");
 157
 158         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 159         info->fbops = &intelfb_ops;
 160
 161         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 162         if (ret) {
 163                 ret = -ENOMEM;
 164                 goto out_unpin;
 165         }
 166         /* setup aperture base/size for vesafb takeover */
 167         info->apertures = alloc_apertures(1);
 168         if (!info->apertures) {
 169                 ret = -ENOMEM;
 170                 goto out_unpin;
 171         }
 172         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 173         info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;
 174
 175         info->fix.smem_start = dev->mode_config.fb_base + i915_gem_obj_ggtt_offset(obj);
 176         info->fix.smem_len = size;
 177
 178         info->screen_base =
 179                 ioremap_wc(dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj),
 180                            size);
 181         if (!info->screen_base) {
 182                 ret = -ENOSPC;
 183                 goto out_unpin;
 184         }
 185         info->screen_size = size;
 186
 187         /* This driver doesn't need a VT switch to restore the mode on resume */
 188         info->skip_vt_switch = true;
 189
 190         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 191         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 192
 193         /* If the object is shmemfs backed, it will have given us zeroed pages.
 194          * If the object is stolen however, it will be full of whatever
 195          * garbage was left in there.
 196          */
 197         if (ifbdev->ifb.obj->stolen)
 198                 memset_io(info->screen_base, 0, info->screen_size);
 199
 200         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 201
 202         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08lx, bo %p\n",
 203                       fb->width, fb->height,
 204                       i915_gem_obj_ggtt_offset(obj), obj);
 205
 206         mutex_unlock(&dev->struct_mutex);
 207         vga_switcheroo_client_fb_set(dev->pdev, info);
 208         return 0;
 209
 210 out_unpin:
 211         i915_gem_object_unpin(obj);
 212         drm_gem_object_unreference(&obj->base);
 213 out_unlock:
 214         mutex_unlock(&dev->struct_mutex);
 215         return ret;
 216 }
 217
 218 /** Sets the color ramps on behalf of RandR */
 219 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 220                                     u16 blue, int regno)
 221 {
 222         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 223
 224         intel_crtc->lut_r[regno] = red >> 8;
 225         intel_crtc->lut_g[regno] = green >> 8;
 226         intel_crtc->lut_b[regno] = blue >> 8;
 227 }
 228
 229 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 230                                     u16 *blue, int regno)
 231 {
 232         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 233
 234         *red = intel_crtc->lut_r[regno] << 8;
 235         *green = intel_crtc->lut_g[regno] << 8;
 236         *blue = intel_crtc->lut_b[regno] << 8;
 237 }
 238
 239 static struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 240         .gamma_set = intel_crtc_fb_gamma_set,
 241         .gamma_get = intel_crtc_fb_gamma_get,
 242         .fb_probe = intelfb_create,
 243 };
 244
 245 static void intel_fbdev_destroy(struct drm_device *dev,
 246                                 struct intel_fbdev *ifbdev)
 247 {
 248         if (ifbdev->helper.fbdev) {
 249                 struct fb_info *info = ifbdev->helper.fbdev;
 250
 251                 unregister_framebuffer(info);
 252                 iounmap(info->screen_base);
 253                 if (info->cmap.len)
 254                         fb_dealloc_cmap(&info->cmap);
 255
 256                 framebuffer_release(info);
 257         }
 258
 259         drm_fb_helper_fini(&ifbdev->helper);
 260
 261         drm_framebuffer_unregister_private(&ifbdev->ifb.base);
 262         intel_framebuffer_fini(&ifbdev->ifb);
 263 }
 264
 265 int intel_fbdev_init(struct drm_device *dev)
 266 {
 267         struct intel_fbdev *ifbdev;
 268         struct drm_i915_private *dev_priv = dev->dev_private;
 269         int ret;
 270
 271         ifbdev = kzalloc(sizeof(*ifbdev), GFP_KERNEL);
 272         if (!ifbdev)
 273                 return -ENOMEM;
 274
 275         dev_priv->fbdev = ifbdev;
 276         ifbdev->helper.funcs = &intel_fb_helper_funcs;
 277
 278         ret = drm_fb_helper_init(dev, &ifbdev->helper,
 279                                  INTEL_INFO(dev)->num_pipes,
 280                                  4);
 281         if (ret) {
 282                 kfree(ifbdev);
 283                 return ret;
 284         }
 285
 286         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 287
 288         return 0;
 289 }
 290
 291 void intel_fbdev_initial_config(struct drm_device *dev)
 292 {
 293         struct drm_i915_private *dev_priv = dev->dev_private;
 294
 295         /* Due to peculiar init order wrt to hpd handling this is separate. */
 296         drm_fb_helper_initial_config(&dev_priv->fbdev->helper, 32);
 297 }
 298
 299 void intel_fbdev_fini(struct drm_device *dev)
 300 {
 301         struct drm_i915_private *dev_priv = dev->dev_private;
 302         if (!dev_priv->fbdev)
 303                 return;
 304
 305         intel_fbdev_destroy(dev, dev_priv->fbdev);
 306         kfree(dev_priv->fbdev);
 307         dev_priv->fbdev = NULL;
 308 }
 309
 310 void intel_fbdev_set_suspend(struct drm_device *dev, int state)
 311 {
 312         struct drm_i915_private *dev_priv = dev->dev_private;
 313         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 314         struct fb_info *info;
 315
 316         if (!ifbdev)
 317                 return;
 318
 319         info = ifbdev->helper.fbdev;
 320
 321         /* On resume from hibernation: If the object is shmemfs backed, it has
 322          * been restored from swap. If the object is stolen however, it will be
 323          * full of whatever garbage was left in there.
 324          */
 325         if (state == FBINFO_STATE_RUNNING && ifbdev->ifb.obj->stolen)
 326                 memset_io(info->screen_base, 0, info->screen_size);
 327
 328         fb_set_suspend(info, state);
 329 }
 330
 331 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 332 {
 333         struct drm_i915_private *dev_priv = dev->dev_private;
 334         drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
 335 }
 336
 337 void intel_fbdev_restore_mode(struct drm_device *dev)
 338 {
 339         int ret;
 340         struct drm_i915_private *dev_priv = dev->dev_private;
 341
 342         if (INTEL_INFO(dev)->num_pipes == 0)
 343                 return;
 344
 345         drm_modeset_lock_all(dev);
 346
 347         ret = drm_fb_helper_restore_fbdev_mode(&dev_priv->fbdev->helper);
 348         if (ret)
 349                 DRM_DEBUG("failed to restore crtc mode\n");
 350
 351         drm_modeset_unlock_all(dev);
 352 }