554 lines
15 KiB
C
554 lines
15 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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static unsigned long i915_stolen_to_physical(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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struct resource *r;
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u32 base;
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/* Almost universally we can find the Graphics Base of Stolen Memory
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* at offset 0x5c in the igfx configuration space. On a few (desktop)
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* machines this is also mirrored in the bridge device at different
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* locations, or in the MCHBAR. On gen2, the layout is again slightly
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* different with the Graphics Segment immediately following Top of
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* Memory (or Top of Usable DRAM). Note it appears that TOUD is only
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* reported by 865g, so we just use the top of memory as determined
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* by the e820 probe.
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*
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* XXX However gen2 requires an unavailable symbol.
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*/
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base = 0;
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if (INTEL_INFO(dev)->gen >= 3) {
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/* Read Graphics Base of Stolen Memory directly */
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pci_read_config_dword(dev->pdev, 0x5c, &base);
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base &= ~((1<<20) - 1);
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} else { /* GEN2 */
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#if 0
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/* Stolen is immediately above Top of Memory */
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base = max_low_pfn_mapped << PAGE_SHIFT;
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#endif
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}
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if (base == 0)
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return 0;
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/* make sure we don't clobber the GTT if it's within stolen memory */
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if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
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struct {
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u32 start, end;
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} stolen[2] = {
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{ .start = base, .end = base + dev_priv->gtt.stolen_size, },
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{ .start = base, .end = base + dev_priv->gtt.stolen_size, },
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};
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u64 gtt_start, gtt_end;
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gtt_start = I915_READ(PGTBL_CTL);
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if (IS_GEN4(dev))
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gtt_start = (gtt_start & PGTBL_ADDRESS_LO_MASK) |
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(gtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
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else
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gtt_start &= PGTBL_ADDRESS_LO_MASK;
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gtt_end = gtt_start + gtt_total_entries(dev_priv->gtt) * 4;
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if (gtt_start >= stolen[0].start && gtt_start < stolen[0].end)
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stolen[0].end = gtt_start;
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if (gtt_end > stolen[1].start && gtt_end <= stolen[1].end)
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stolen[1].start = gtt_end;
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/* pick the larger of the two chunks */
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if (stolen[0].end - stolen[0].start >
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stolen[1].end - stolen[1].start) {
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base = stolen[0].start;
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dev_priv->gtt.stolen_size = stolen[0].end - stolen[0].start;
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} else {
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base = stolen[1].start;
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dev_priv->gtt.stolen_size = stolen[1].end - stolen[1].start;
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}
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if (stolen[0].start != stolen[1].start ||
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stolen[0].end != stolen[1].end) {
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DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
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(unsigned long long) gtt_start,
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(unsigned long long) gtt_end - 1);
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DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
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base, base + (u32) dev_priv->gtt.stolen_size - 1);
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}
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}
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/* Verify that nothing else uses this physical address. Stolen
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* memory should be reserved by the BIOS and hidden from the
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* kernel. So if the region is already marked as busy, something
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* is seriously wrong.
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*/
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r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size,
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"Graphics Stolen Memory");
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if (r == NULL) {
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/*
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* One more attempt but this time requesting region from
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* base + 1, as we have seen that this resolves the region
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* conflict with the PCI Bus.
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* This is a BIOS w/a: Some BIOS wrap stolen in the root
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* PCI bus, but have an off-by-one error. Hence retry the
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* reservation starting from 1 instead of 0.
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*/
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r = devm_request_mem_region(dev->dev, base + 1,
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dev_priv->gtt.stolen_size - 1,
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"Graphics Stolen Memory");
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/*
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* GEN3 firmware likes to smash pci bridges into the stolen
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* range. Apparently this works.
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*/
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if (r == NULL && !IS_GEN3(dev)) {
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DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
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base, base + (uint32_t)dev_priv->gtt.stolen_size);
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base = 0;
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}
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}
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return base;
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}
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static int find_compression_threshold(struct drm_device *dev,
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struct drm_mm_node *node,
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int size,
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int fb_cpp)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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int compression_threshold = 1;
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int ret;
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/* HACK: This code depends on what we will do in *_enable_fbc. If that
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* code changes, this code needs to change as well.
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*
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* The enable_fbc code will attempt to use one of our 2 compression
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* thresholds, therefore, in that case, we only have 1 resort.
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*/
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/* Try to over-allocate to reduce reallocations and fragmentation. */
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ret = drm_mm_insert_node(&dev_priv->mm.stolen, node,
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size <<= 1, 4096, DRM_MM_SEARCH_DEFAULT);
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if (ret == 0)
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return compression_threshold;
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again:
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/* HW's ability to limit the CFB is 1:4 */
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if (compression_threshold > 4 ||
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(fb_cpp == 2 && compression_threshold == 2))
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return 0;
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ret = drm_mm_insert_node(&dev_priv->mm.stolen, node,
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size >>= 1, 4096,
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DRM_MM_SEARCH_DEFAULT);
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if (ret && INTEL_INFO(dev)->gen <= 4) {
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return 0;
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} else if (ret) {
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compression_threshold <<= 1;
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goto again;
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} else {
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return compression_threshold;
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}
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}
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static int i915_setup_compression(struct drm_device *dev, int size, int fb_cpp)
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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 *uninitialized_var(compressed_llb);
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int ret;
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ret = find_compression_threshold(dev, &dev_priv->fbc.compressed_fb,
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size, fb_cpp);
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if (!ret)
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goto err_llb;
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else if (ret > 1) {
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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");
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}
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dev_priv->fbc.threshold = ret;
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if (HAS_PCH_SPLIT(dev))
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I915_WRITE(ILK_DPFC_CB_BASE, dev_priv->fbc.compressed_fb.start);
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else if (IS_GM45(dev)) {
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I915_WRITE(DPFC_CB_BASE, dev_priv->fbc.compressed_fb.start);
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} else {
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compressed_llb = kzalloc(sizeof(*compressed_llb), GFP_KERNEL);
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if (!compressed_llb)
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goto err_fb;
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ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_llb,
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4096, 4096, DRM_MM_SEARCH_DEFAULT);
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if (ret)
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goto err_fb;
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dev_priv->fbc.compressed_llb = compressed_llb;
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I915_WRITE(FBC_CFB_BASE,
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dev_priv->mm.stolen_base + dev_priv->fbc.compressed_fb.start);
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I915_WRITE(FBC_LL_BASE,
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dev_priv->mm.stolen_base + compressed_llb->start);
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}
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dev_priv->fbc.uncompressed_size = size;
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DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n",
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size);
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return 0;
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err_fb:
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kfree(compressed_llb);
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drm_mm_remove_node(&dev_priv->fbc.compressed_fb);
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err_llb:
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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);
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return -ENOSPC;
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}
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int i915_gem_stolen_setup_compression(struct drm_device *dev, int size, int fb_cpp)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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if (!drm_mm_initialized(&dev_priv->mm.stolen))
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return -ENODEV;
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if (size <= dev_priv->fbc.uncompressed_size)
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return 0;
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/* Release any current block */
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i915_gem_stolen_cleanup_compression(dev);
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return i915_setup_compression(dev, size, fb_cpp);
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}
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void i915_gem_stolen_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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if (dev_priv->fbc.uncompressed_size == 0)
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return;
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drm_mm_remove_node(&dev_priv->fbc.compressed_fb);
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if (dev_priv->fbc.compressed_llb) {
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drm_mm_remove_node(dev_priv->fbc.compressed_llb);
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kfree(dev_priv->fbc.compressed_llb);
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}
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dev_priv->fbc.uncompressed_size = 0;
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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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struct drm_i915_private *dev_priv = dev->dev_private;
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if (!drm_mm_initialized(&dev_priv->mm.stolen))
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return;
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i915_gem_stolen_cleanup_compression(dev);
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drm_mm_takedown(&dev_priv->mm.stolen);
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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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u32 tmp;
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int bios_reserved = 0;
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#ifdef CONFIG_INTEL_IOMMU
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if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
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DRM_INFO("DMAR active, disabling use of stolen memory\n");
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return 0;
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}
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#endif
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if (dev_priv->gtt.stolen_size == 0)
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return 0;
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dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
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if (dev_priv->mm.stolen_base == 0)
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return 0;
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DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
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dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);
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if (INTEL_INFO(dev)->gen >= 8) {
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tmp = I915_READ(GEN7_BIOS_RESERVED);
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tmp >>= GEN8_BIOS_RESERVED_SHIFT;
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tmp &= GEN8_BIOS_RESERVED_MASK;
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bios_reserved = (1024*1024) << tmp;
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} else if (IS_GEN7(dev)) {
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tmp = I915_READ(GEN7_BIOS_RESERVED);
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bios_reserved = tmp & GEN7_BIOS_RESERVED_256K ?
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256*1024 : 1024*1024;
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}
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if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size))
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return 0;
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/* Basic memrange allocator for stolen space */
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drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size -
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bios_reserved);
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return 0;
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}
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static struct sg_table *
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i915_pages_create_for_stolen(struct drm_device *dev,
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u32 offset, u32 size)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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struct sg_table *st;
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struct scatterlist *sg;
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DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
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BUG_ON(offset > dev_priv->gtt.stolen_size - size);
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/* We hide that we have no struct page backing our stolen object
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* by wrapping the contiguous physical allocation with a fake
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* dma mapping in a single scatterlist.
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*/
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st = kmalloc(sizeof(*st), GFP_KERNEL);
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if (st == NULL)
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return NULL;
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if (sg_alloc_table(st, 1, GFP_KERNEL)) {
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kfree(st);
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return NULL;
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}
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sg = st->sgl;
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sg->offset = 0;
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sg->length = size;
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sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
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sg_dma_len(sg) = size;
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return st;
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}
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static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
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{
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BUG();
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return -EINVAL;
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}
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static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
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{
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/* Should only be called during free */
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sg_free_table(obj->pages);
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kfree(obj->pages);
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}
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static void
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i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
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{
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if (obj->stolen) {
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drm_mm_remove_node(obj->stolen);
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kfree(obj->stolen);
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obj->stolen = NULL;
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}
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}
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static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
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.get_pages = i915_gem_object_get_pages_stolen,
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.put_pages = i915_gem_object_put_pages_stolen,
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.release = i915_gem_object_release_stolen,
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};
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static struct drm_i915_gem_object *
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_i915_gem_object_create_stolen(struct drm_device *dev,
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struct drm_mm_node *stolen)
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{
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struct drm_i915_gem_object *obj;
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obj = i915_gem_object_alloc(dev);
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if (obj == NULL)
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return NULL;
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drm_gem_private_object_init(dev, &obj->base, stolen->size);
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i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
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obj->pages = i915_pages_create_for_stolen(dev,
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stolen->start, stolen->size);
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if (obj->pages == NULL)
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goto cleanup;
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obj->has_dma_mapping = true;
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i915_gem_object_pin_pages(obj);
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obj->stolen = stolen;
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obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
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obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
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return obj;
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cleanup:
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i915_gem_object_free(obj);
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return NULL;
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}
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struct drm_i915_gem_object *
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i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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struct drm_i915_gem_object *obj;
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struct drm_mm_node *stolen;
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int ret;
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if (!drm_mm_initialized(&dev_priv->mm.stolen))
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return NULL;
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DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
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if (size == 0)
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return NULL;
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stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
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if (!stolen)
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return NULL;
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ret = drm_mm_insert_node(&dev_priv->mm.stolen, stolen, size,
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4096, DRM_MM_SEARCH_DEFAULT);
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if (ret) {
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kfree(stolen);
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return NULL;
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}
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obj = _i915_gem_object_create_stolen(dev, stolen);
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if (obj)
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return obj;
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drm_mm_remove_node(stolen);
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kfree(stolen);
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return NULL;
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}
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struct drm_i915_gem_object *
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i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
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u32 stolen_offset,
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u32 gtt_offset,
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u32 size)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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struct i915_address_space *ggtt = &dev_priv->gtt.base;
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struct drm_i915_gem_object *obj;
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struct drm_mm_node *stolen;
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struct i915_vma *vma;
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int ret;
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if (!drm_mm_initialized(&dev_priv->mm.stolen))
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return NULL;
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DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
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stolen_offset, gtt_offset, size);
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/* KISS and expect everything to be page-aligned */
|
|
if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
|
|
WARN_ON(stolen_offset & 4095))
|
|
return NULL;
|
|
|
|
stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
|
|
if (!stolen)
|
|
return NULL;
|
|
|
|
stolen->start = stolen_offset;
|
|
stolen->size = size;
|
|
ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
|
|
if (ret) {
|
|
DRM_DEBUG_KMS("failed to allocate stolen space\n");
|
|
kfree(stolen);
|
|
return NULL;
|
|
}
|
|
|
|
obj = _i915_gem_object_create_stolen(dev, stolen);
|
|
if (obj == NULL) {
|
|
DRM_DEBUG_KMS("failed to allocate stolen object\n");
|
|
drm_mm_remove_node(stolen);
|
|
kfree(stolen);
|
|
return NULL;
|
|
}
|
|
|
|
/* Some objects just need physical mem from stolen space */
|
|
if (gtt_offset == I915_GTT_OFFSET_NONE)
|
|
return obj;
|
|
|
|
vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt);
|
|
if (IS_ERR(vma)) {
|
|
ret = PTR_ERR(vma);
|
|
goto err_out;
|
|
}
|
|
|
|
/* To simplify the initialisation sequence between KMS and GTT,
|
|
* we allow construction of the stolen object prior to
|
|
* setting up the GTT space. The actual reservation will occur
|
|
* later.
|
|
*/
|
|
vma->node.start = gtt_offset;
|
|
vma->node.size = size;
|
|
if (drm_mm_initialized(&ggtt->mm)) {
|
|
ret = drm_mm_reserve_node(&ggtt->mm, &vma->node);
|
|
if (ret) {
|
|
DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
|
|
goto err_vma;
|
|
}
|
|
}
|
|
|
|
vma->bound |= GLOBAL_BIND;
|
|
|
|
list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
|
|
list_add_tail(&vma->mm_list, &ggtt->inactive_list);
|
|
i915_gem_object_pin_pages(obj);
|
|
|
|
return obj;
|
|
|
|
err_vma:
|
|
i915_gem_vma_destroy(vma);
|
|
err_out:
|
|
drm_mm_remove_node(stolen);
|
|
kfree(stolen);
|
|
drm_gem_object_unreference(&obj->base);
|
|
return NULL;
|
|
}
|