-static int find_compression_threshold(struct drm_device *dev,
- struct drm_mm_node *node,
- int size,
- int fb_cpp)
-{
- struct drm_i915_private *dev_priv = dev->dev_private;
- int compression_threshold = 1;
- int ret;
-
- /* HACK: This code depends on what we will do in *_enable_fbc. If that
- * code changes, this code needs to change as well.
- *
- * The enable_fbc code will attempt to use one of our 2 compression
- * thresholds, therefore, in that case, we only have 1 resort.
- */
-
- /* Try to over-allocate to reduce reallocations and fragmentation. */
- ret = drm_mm_insert_node(&dev_priv->mm.stolen, node,
- size <<= 1, 4096, DRM_MM_SEARCH_DEFAULT);
- if (ret == 0)
- return compression_threshold;
-
-again:
- /* HW's ability to limit the CFB is 1:4 */
- if (compression_threshold > 4 ||
- (fb_cpp == 2 && compression_threshold == 2))
- return 0;
-
- ret = drm_mm_insert_node(&dev_priv->mm.stolen, node,
- size >>= 1, 4096,
- DRM_MM_SEARCH_DEFAULT);
- if (ret && INTEL_INFO(dev)->gen <= 4) {
- return 0;
- } else if (ret) {
- compression_threshold <<= 1;
- goto again;
- } else {
- return compression_threshold;
- }
-}
-
-static int i915_setup_compression(struct drm_device *dev, int size, int fb_cpp)
-{
- struct drm_i915_private *dev_priv = dev->dev_private;
- struct drm_mm_node *uninitialized_var(compressed_llb);
- int ret;
-
- ret = find_compression_threshold(dev, &dev_priv->fbc.compressed_fb,
- size, fb_cpp);
- if (!ret)
- goto err_llb;
- else if (ret > 1) {
- DRM_INFO("Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS.\n");
-
- }
-
- dev_priv->fbc.threshold = ret;
-
- if (HAS_PCH_SPLIT(dev))
- I915_WRITE(ILK_DPFC_CB_BASE, dev_priv->fbc.compressed_fb.start);
- else if (IS_GM45(dev)) {
- I915_WRITE(DPFC_CB_BASE, dev_priv->fbc.compressed_fb.start);
- } else {
- compressed_llb = kzalloc(sizeof(*compressed_llb), GFP_KERNEL);
- if (!compressed_llb)
- goto err_fb;
-
- ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_llb,
- 4096, 4096, DRM_MM_SEARCH_DEFAULT);
- if (ret)
- goto err_fb;
-
- dev_priv->fbc.compressed_llb = compressed_llb;
-
- I915_WRITE(FBC_CFB_BASE,
- dev_priv->mm.stolen_base + dev_priv->fbc.compressed_fb.start);
- I915_WRITE(FBC_LL_BASE,
- dev_priv->mm.stolen_base + compressed_llb->start);
- }
-
- dev_priv->fbc.uncompressed_size = size;
-
- DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n",
- size);
-
- return 0;
-
-err_fb:
- kfree(compressed_llb);
- drm_mm_remove_node(&dev_priv->fbc.compressed_fb);
-err_llb:
- pr_info_once("drm: not enough stolen space for compressed buffer (need %d more bytes), disabling. Hint: you may be able to increase stolen memory size in the BIOS to avoid this.\n", size);
- return -ENOSPC;
-}
-
-int i915_gem_stolen_setup_compression(struct drm_device *dev, int size, int fb_cpp)
-{
- struct drm_i915_private *dev_priv = dev->dev_private;
-
- if (!drm_mm_initialized(&dev_priv->mm.stolen))
- return -ENODEV;
-
- if (size <= dev_priv->fbc.uncompressed_size)
- return 0;
-
- /* Release any current block */
- i915_gem_stolen_cleanup_compression(dev);
-
- return i915_setup_compression(dev, size, fb_cpp);
-}
-
-void i915_gem_stolen_cleanup_compression(struct drm_device *dev)
-{
- struct drm_i915_private *dev_priv = dev->dev_private;
-
- if (dev_priv->fbc.uncompressed_size == 0)
- return;
-
- drm_mm_remove_node(&dev_priv->fbc.compressed_fb);
-
- if (dev_priv->fbc.compressed_llb) {
- drm_mm_remove_node(dev_priv->fbc.compressed_llb);
- kfree(dev_priv->fbc.compressed_llb);
- }
-
- dev_priv->fbc.uncompressed_size = 0;
-}
-