| 0,0 → 1,201 |
|---|
| /* |
| * 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 <eric@anholt.net> |
| * Chris Wilson <chris@chris-wilson.co.uk> |
| * |
| */ |
| |
| #include <drm/drmP.h> |
| #include <drm/i915_drm.h> |
| #include "i915_drv.h" |
| |
| /* |
| * 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. |
| */ |
| |
| #define PTE_ADDRESS_MASK 0xfffff000 |
| #define PTE_ADDRESS_MASK_HIGH 0x000000f0 /* i915+ */ |
| #define PTE_MAPPING_TYPE_UNCACHED (0 << 1) |
| #define PTE_MAPPING_TYPE_DCACHE (1 << 1) /* i830 only */ |
| #define PTE_MAPPING_TYPE_CACHED (3 << 1) |
| #define PTE_MAPPING_TYPE_MASK (3 << 1) |
| #define PTE_VALID (1 << 0) |
| |
| /** |
| * i915_stolen_to_phys - take an offset into stolen memory and turn it into |
| * a physical one |
| * @dev: drm device |
| * @offset: address to translate |
| * |
| * Some chip functions require allocations from stolen space and need the |
| * physical address of the memory in question. |
| */ |
| static unsigned long i915_stolen_to_phys(struct drm_device *dev, u32 offset) |
| { |
| struct drm_i915_private *dev_priv = dev->dev_private; |
| struct pci_dev *pdev = dev_priv->bridge_dev; |
| u32 base; |
| |
| #if 0 |
| /* On the machines I have tested the Graphics Base of Stolen Memory |
| * is unreliable, so 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. |
| */ |
| if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) { |
| /* top 32bits are reserved = 0 */ |
| pci_read_config_dword(pdev, 0xA4, &base); |
| } else { |
| /* XXX presume 8xx is the same as i915 */ |
| pci_bus_read_config_dword(pdev->bus, 2, 0x5C, &base); |
| } |
| #else |
| if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) { |
| u16 val; |
| pci_read_config_word(pdev, 0xb0, &val); |
| base = val >> 4 << 20; |
| } else { |
| u8 val; |
| pci_read_config_byte(pdev, 0x9c, &val); |
| base = val >> 3 << 27; |
| } |
| base -= dev_priv->mm.gtt->stolen_size; |
| #endif |
| |
| return base + offset; |
| } |
| |
| 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 = i915_stolen_to_phys(dev, 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 = i915_stolen_to_phys(dev, 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", |
| cfb_base, 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; |
| |
| /* 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; |
| } |