/* * Copyright © 2008-2012 Intel Corporation * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. * * Authors: * Eric Anholt * Chris Wilson * */ #include __FBSDID("$FreeBSD$"); #include #include #include /* * The BIOS typically reserves some of the system's memory for the exclusive * use of the integrated graphics. This memory is no longer available for * use by the OS and so the user finds that his system has less memory * available than he put in. We refer to this memory as stolen. * * The BIOS will allocate its framebuffer from the stolen memory. Our * goal is try to reuse that object for our own fbcon which must always * be available for panics. Anything else we can reuse the stolen memory * for is a boon. */ static unsigned long i915_stolen_to_physical(struct drm_device *dev) { u32 base; /* On the machines I have tested the Graphics Base of Stolen Memory * is unreliable, so on those compute the base by subtracting the * stolen memory from the Top of Low Usable DRAM which is where the * BIOS places the graphics stolen memory. * * On gen2, the layout is slightly different with the Graphics Segment * immediately following Top of Memory (or Top of Usable DRAM). Note * it appears that TOUD is only reported by 865g, so we just use the * top of memory as determined by the e820 probe. * * XXX gen2 requires an unavailable symbol and 945gm fails with * its value of TOLUD. */ base = 0; if (INTEL_INFO(dev)->gen >= 6) { /* Read Base Data of Stolen Memory Register (BDSM) directly. * Note that there is also a MCHBAR miror at 0x1080c0 or * we could use device 2:0x5c instead. */ pci_read_config_dword(dev->dev, 0xB0, &base); base &= ~4095; /* lower bits used for locking register */ } else if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) { /* Read Graphics Base of Stolen Memory directly */ pci_read_config_dword(dev->dev, 0xA4, &base); #if 0 } else if (IS_GEN3(dev)) { u8 val; /* Stolen is immediately below Top of Low Usable DRAM */ pci_read_config_byte(pdev, 0x9c, &val); base = val >> 3 << 27; base -= dev_priv->mm.gtt->stolen_size; } else { /* Stolen is immediately above Top of Memory */ base = max_low_pfn_mapped << PAGE_SHIFT; #endif } return base; } static void i915_warn_stolen(struct drm_device *dev) { DRM_INFO("not enough stolen space for compressed buffer, disabling\n"); DRM_INFO("hint: you may be able to increase stolen memory size in the BIOS to avoid this\n"); } static void i915_setup_compression(struct drm_device *dev, int size) { struct drm_i915_private *dev_priv = dev->dev_private; struct drm_mm_node *compressed_fb, *uninitialized_var(compressed_llb); unsigned long cfb_base; unsigned long ll_base = 0; /* Just in case the BIOS is doing something questionable. */ intel_disable_fbc(dev); compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0); if (compressed_fb) compressed_fb = drm_mm_get_block(compressed_fb, size, 4096); if (!compressed_fb) goto err; cfb_base = dev_priv->mm.stolen_base + compressed_fb->start; if (!cfb_base) goto err_fb; if (!(IS_GM45(dev) || HAS_PCH_SPLIT(dev))) { compressed_llb = drm_mm_search_free(&dev_priv->mm.stolen, 4096, 4096, 0); if (compressed_llb) compressed_llb = drm_mm_get_block(compressed_llb, 4096, 4096); if (!compressed_llb) goto err_fb; ll_base = dev_priv->mm.stolen_base + compressed_llb->start; if (!ll_base) goto err_llb; } dev_priv->cfb_size = size; dev_priv->compressed_fb = compressed_fb; if (HAS_PCH_SPLIT(dev)) I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start); else if (IS_GM45(dev)) { I915_WRITE(DPFC_CB_BASE, compressed_fb->start); } else { I915_WRITE(FBC_CFB_BASE, cfb_base); I915_WRITE(FBC_LL_BASE, ll_base); dev_priv->compressed_llb = compressed_llb; } DRM_DEBUG_KMS("FBC base 0x%08lx, ll base 0x%08lx, size %dM\n", (long)cfb_base, (long)ll_base, size >> 20); return; err_llb: drm_mm_put_block(compressed_llb); err_fb: drm_mm_put_block(compressed_fb); err: dev_priv->no_fbc_reason = FBC_STOLEN_TOO_SMALL; i915_warn_stolen(dev); } static void i915_cleanup_compression(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; drm_mm_put_block(dev_priv->compressed_fb); if (dev_priv->compressed_llb) drm_mm_put_block(dev_priv->compressed_llb); } void i915_gem_cleanup_stolen(struct drm_device *dev) { if (I915_HAS_FBC(dev) && i915_powersave) i915_cleanup_compression(dev); } int i915_gem_init_stolen(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; unsigned long prealloc_size = dev_priv->mm.gtt->stolen_size; dev_priv->mm.stolen_base = i915_stolen_to_physical(dev); if (dev_priv->mm.stolen_base == 0) return 0; DRM_DEBUG_KMS("found %d bytes of stolen memory at %08lx\n", dev_priv->mm.gtt->stolen_size, dev_priv->mm.stolen_base); /* Basic memrange allocator for stolen space */ drm_mm_init(&dev_priv->mm.stolen, 0, prealloc_size); /* Try to set up FBC with a reasonable compressed buffer size */ if (I915_HAS_FBC(dev) && i915_powersave) { int cfb_size; /* Leave 1M for line length buffer & misc. */ /* Try to get a 32M buffer... */ if (prealloc_size > (36*1024*1024)) cfb_size = 32*1024*1024; else /* fall back to 7/8 of the stolen space */ cfb_size = prealloc_size * 7 / 8; i915_setup_compression(dev, cfb_size); } return 0; }