202 lines
6.2 KiB
C
202 lines
6.2 KiB
C
/*
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* Copyright © 2008-2012 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Eric Anholt <eric@anholt.net>
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* Chris Wilson <chris@chris-wilson.co.uk>
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*
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*/
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#include <drm/drmP.h>
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#include <drm/i915_drm.h>
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#include "i915_drv.h"
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/*
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* The BIOS typically reserves some of the system's memory for the exclusive
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* use of the integrated graphics. This memory is no longer available for
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* use by the OS and so the user finds that his system has less memory
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* available than he put in. We refer to this memory as stolen.
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*
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* The BIOS will allocate its framebuffer from the stolen memory. Our
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* goal is try to reuse that object for our own fbcon which must always
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* be available for panics. Anything else we can reuse the stolen memory
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* for is a boon.
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*/
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#define PTE_ADDRESS_MASK 0xfffff000
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#define PTE_ADDRESS_MASK_HIGH 0x000000f0 /* i915+ */
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#define PTE_MAPPING_TYPE_UNCACHED (0 << 1)
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#define PTE_MAPPING_TYPE_DCACHE (1 << 1) /* i830 only */
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#define PTE_MAPPING_TYPE_CACHED (3 << 1)
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#define PTE_MAPPING_TYPE_MASK (3 << 1)
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#define PTE_VALID (1 << 0)
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/**
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* i915_stolen_to_phys - take an offset into stolen memory and turn it into
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* a physical one
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* @dev: drm device
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* @offset: address to translate
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*
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* Some chip functions require allocations from stolen space and need the
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* physical address of the memory in question.
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*/
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static unsigned long i915_stolen_to_phys(struct drm_device *dev, u32 offset)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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struct pci_dev *pdev = dev_priv->bridge_dev;
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u32 base;
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#if 0
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/* On the machines I have tested the Graphics Base of Stolen Memory
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* is unreliable, so compute the base by subtracting the stolen memory
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* from the Top of Low Usable DRAM which is where the BIOS places
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* the graphics stolen memory.
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*/
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if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) {
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/* top 32bits are reserved = 0 */
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pci_read_config_dword(pdev, 0xA4, &base);
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} else {
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/* XXX presume 8xx is the same as i915 */
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pci_bus_read_config_dword(pdev->bus, 2, 0x5C, &base);
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}
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#else
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if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) {
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u16 val;
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pci_read_config_word(pdev, 0xb0, &val);
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base = val >> 4 << 20;
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} else {
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u8 val;
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pci_read_config_byte(pdev, 0x9c, &val);
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base = val >> 3 << 27;
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}
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base -= dev_priv->mm.gtt->stolen_size;
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#endif
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return base + offset;
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}
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static void i915_warn_stolen(struct drm_device *dev)
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{
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DRM_INFO("not enough stolen space for compressed buffer, disabling\n");
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DRM_INFO("hint: you may be able to increase stolen memory size in the BIOS to avoid this\n");
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}
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static void i915_setup_compression(struct drm_device *dev, int size)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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struct drm_mm_node *compressed_fb, *uninitialized_var(compressed_llb);
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unsigned long cfb_base;
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unsigned long ll_base = 0;
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/* Just in case the BIOS is doing something questionable. */
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intel_disable_fbc(dev);
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compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0);
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if (compressed_fb)
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compressed_fb = drm_mm_get_block(compressed_fb, size, 4096);
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if (!compressed_fb)
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goto err;
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cfb_base = i915_stolen_to_phys(dev, compressed_fb->start);
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if (!cfb_base)
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goto err_fb;
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if (!(IS_GM45(dev) || HAS_PCH_SPLIT(dev))) {
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compressed_llb = drm_mm_search_free(&dev_priv->mm.stolen,
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4096, 4096, 0);
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if (compressed_llb)
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compressed_llb = drm_mm_get_block(compressed_llb,
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4096, 4096);
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if (!compressed_llb)
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goto err_fb;
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ll_base = i915_stolen_to_phys(dev, compressed_llb->start);
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if (!ll_base)
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goto err_llb;
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}
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dev_priv->cfb_size = size;
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dev_priv->compressed_fb = compressed_fb;
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if (HAS_PCH_SPLIT(dev))
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I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start);
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else if (IS_GM45(dev)) {
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I915_WRITE(DPFC_CB_BASE, compressed_fb->start);
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} else {
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I915_WRITE(FBC_CFB_BASE, cfb_base);
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I915_WRITE(FBC_LL_BASE, ll_base);
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dev_priv->compressed_llb = compressed_llb;
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}
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DRM_DEBUG_KMS("FBC base 0x%08lx, ll base 0x%08lx, size %dM\n",
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cfb_base, ll_base, size >> 20);
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return;
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err_llb:
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drm_mm_put_block(compressed_llb);
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err_fb:
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drm_mm_put_block(compressed_fb);
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err:
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dev_priv->no_fbc_reason = FBC_STOLEN_TOO_SMALL;
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i915_warn_stolen(dev);
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}
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static void i915_cleanup_compression(struct drm_device *dev)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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drm_mm_put_block(dev_priv->compressed_fb);
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if (dev_priv->compressed_llb)
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drm_mm_put_block(dev_priv->compressed_llb);
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}
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void i915_gem_cleanup_stolen(struct drm_device *dev)
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{
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if (I915_HAS_FBC(dev) && i915_powersave)
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i915_cleanup_compression(dev);
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}
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int i915_gem_init_stolen(struct drm_device *dev)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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unsigned long prealloc_size = dev_priv->mm.gtt->stolen_size;
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/* Basic memrange allocator for stolen space */
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drm_mm_init(&dev_priv->mm.stolen, 0, prealloc_size);
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/* Try to set up FBC with a reasonable compressed buffer size */
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if (I915_HAS_FBC(dev) && i915_powersave) {
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int cfb_size;
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/* Leave 1M for line length buffer & misc. */
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/* Try to get a 32M buffer... */
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if (prealloc_size > (36*1024*1024))
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cfb_size = 32*1024*1024;
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else /* fall back to 7/8 of the stolen space */
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cfb_size = prealloc_size * 7 / 8;
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i915_setup_compression(dev, cfb_size);
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}
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return 0;
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}
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