2 * Copyright © 2008-2012 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * Eric Anholt <eric@anholt.net>
25 * Chris Wilson <chris@chris-wilson.co.uk>
30 #include <drm/i915_drm.h>
34 * The BIOS typically reserves some of the system's memory for the exclusive
35 * use of the integrated graphics. This memory is no longer available for
36 * use by the OS and so the user finds that his system has less memory
37 * available than he put in. We refer to this memory as stolen.
39 * The BIOS will allocate its framebuffer from the stolen memory. Our
40 * goal is try to reuse that object for our own fbcon which must always
41 * be available for panics. Anything else we can reuse the stolen memory
45 int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
46 struct drm_mm_node *node, u64 size,
49 if (!drm_mm_initialized(&dev_priv->mm.stolen))
52 return drm_mm_insert_node(&dev_priv->mm.stolen, node, size, alignment,
53 DRM_MM_SEARCH_DEFAULT);
56 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
57 struct drm_mm_node *node)
59 drm_mm_remove_node(node);
62 static unsigned long i915_stolen_to_physical(struct drm_device *dev)
64 struct drm_i915_private *dev_priv = dev->dev_private;
68 /* Almost universally we can find the Graphics Base of Stolen Memory
69 * at offset 0x5c in the igfx configuration space. On a few (desktop)
70 * machines this is also mirrored in the bridge device at different
71 * locations, or in the MCHBAR. On gen2, the layout is again slightly
72 * different with the Graphics Segment immediately following Top of
73 * Memory (or Top of Usable DRAM). Note it appears that TOUD is only
74 * reported by 865g, so we just use the top of memory as determined
77 * XXX However gen2 requires an unavailable symbol.
80 if (INTEL_INFO(dev)->gen >= 3) {
81 /* Read Graphics Base of Stolen Memory directly */
82 pci_read_config_dword(dev->pdev, 0x5c, &base);
83 base &= ~((1<<20) - 1);
86 /* Stolen is immediately above Top of Memory */
87 base = max_low_pfn_mapped << PAGE_SHIFT;
94 /* make sure we don't clobber the GTT if it's within stolen memory */
95 if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
99 { .start = base, .end = base + dev_priv->gtt.stolen_size, },
100 { .start = base, .end = base + dev_priv->gtt.stolen_size, },
102 u64 gtt_start, gtt_end;
104 gtt_start = I915_READ(PGTBL_CTL);
106 gtt_start = (gtt_start & PGTBL_ADDRESS_LO_MASK) |
107 (gtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
109 gtt_start &= PGTBL_ADDRESS_LO_MASK;
110 gtt_end = gtt_start + gtt_total_entries(dev_priv->gtt) * 4;
112 if (gtt_start >= stolen[0].start && gtt_start < stolen[0].end)
113 stolen[0].end = gtt_start;
114 if (gtt_end > stolen[1].start && gtt_end <= stolen[1].end)
115 stolen[1].start = gtt_end;
117 /* pick the larger of the two chunks */
118 if (stolen[0].end - stolen[0].start >
119 stolen[1].end - stolen[1].start) {
120 base = stolen[0].start;
121 dev_priv->gtt.stolen_size = stolen[0].end - stolen[0].start;
123 base = stolen[1].start;
124 dev_priv->gtt.stolen_size = stolen[1].end - stolen[1].start;
127 if (stolen[0].start != stolen[1].start ||
128 stolen[0].end != stolen[1].end) {
129 DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
130 (unsigned long long) gtt_start,
131 (unsigned long long) gtt_end - 1);
132 DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
133 base, base + (u32) dev_priv->gtt.stolen_size - 1);
138 /* Verify that nothing else uses this physical address. Stolen
139 * memory should be reserved by the BIOS and hidden from the
140 * kernel. So if the region is already marked as busy, something
141 * is seriously wrong.
143 r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size,
144 "Graphics Stolen Memory");
147 * One more attempt but this time requesting region from
148 * base + 1, as we have seen that this resolves the region
149 * conflict with the PCI Bus.
150 * This is a BIOS w/a: Some BIOS wrap stolen in the root
151 * PCI bus, but have an off-by-one error. Hence retry the
152 * reservation starting from 1 instead of 0.
154 r = devm_request_mem_region(dev->dev, base + 1,
155 dev_priv->gtt.stolen_size - 1,
156 "Graphics Stolen Memory");
158 * GEN3 firmware likes to smash pci bridges into the stolen
159 * range. Apparently this works.
161 if (r == NULL && !IS_GEN3(dev)) {
162 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
163 base, base + (uint32_t)dev_priv->gtt.stolen_size);
171 void i915_gem_cleanup_stolen(struct drm_device *dev)
173 struct drm_i915_private *dev_priv = dev->dev_private;
175 if (!drm_mm_initialized(&dev_priv->mm.stolen))
178 drm_mm_takedown(&dev_priv->mm.stolen);
181 int i915_gem_init_stolen(struct drm_device *dev)
183 struct drm_i915_private *dev_priv = dev->dev_private;
185 int bios_reserved = 0;
187 #ifdef CONFIG_INTEL_IOMMU
188 if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
189 DRM_INFO("DMAR active, disabling use of stolen memory\n");
194 if (dev_priv->gtt.stolen_size == 0)
197 dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
198 if (dev_priv->mm.stolen_base == 0)
201 DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
202 dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);
204 if (INTEL_INFO(dev)->gen >= 8) {
205 tmp = I915_READ(GEN7_BIOS_RESERVED);
206 tmp >>= GEN8_BIOS_RESERVED_SHIFT;
207 tmp &= GEN8_BIOS_RESERVED_MASK;
208 bios_reserved = (1024*1024) << tmp;
209 } else if (IS_GEN7(dev)) {
210 tmp = I915_READ(GEN7_BIOS_RESERVED);
211 bios_reserved = tmp & GEN7_BIOS_RESERVED_256K ?
212 256*1024 : 1024*1024;
215 if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size))
218 /* Basic memrange allocator for stolen space */
219 drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size -
225 static struct sg_table *
226 i915_pages_create_for_stolen(struct drm_device *dev,
227 u32 offset, u32 size)
229 struct drm_i915_private *dev_priv = dev->dev_private;
231 struct scatterlist *sg;
233 DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
234 BUG_ON(offset > dev_priv->gtt.stolen_size - size);
236 /* We hide that we have no struct page backing our stolen object
237 * by wrapping the contiguous physical allocation with a fake
238 * dma mapping in a single scatterlist.
241 st = kmalloc(sizeof(*st), GFP_KERNEL);
245 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
254 sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
255 sg_dma_len(sg) = size;
260 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
266 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
268 /* Should only be called during free */
269 sg_free_table(obj->pages);
275 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
277 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
280 i915_gem_stolen_remove_node(dev_priv, obj->stolen);
285 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
286 .get_pages = i915_gem_object_get_pages_stolen,
287 .put_pages = i915_gem_object_put_pages_stolen,
288 .release = i915_gem_object_release_stolen,
291 static struct drm_i915_gem_object *
292 _i915_gem_object_create_stolen(struct drm_device *dev,
293 struct drm_mm_node *stolen)
295 struct drm_i915_gem_object *obj;
297 obj = i915_gem_object_alloc(dev);
301 drm_gem_private_object_init(dev, &obj->base, stolen->size);
302 i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
304 obj->pages = i915_pages_create_for_stolen(dev,
305 stolen->start, stolen->size);
306 if (obj->pages == NULL)
309 obj->has_dma_mapping = true;
310 i915_gem_object_pin_pages(obj);
311 obj->stolen = stolen;
313 obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
314 obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
319 i915_gem_object_free(obj);
323 struct drm_i915_gem_object *
324 i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
326 struct drm_i915_private *dev_priv = dev->dev_private;
327 struct drm_i915_gem_object *obj;
328 struct drm_mm_node *stolen;
331 if (!drm_mm_initialized(&dev_priv->mm.stolen))
334 DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
338 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
342 ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
348 obj = _i915_gem_object_create_stolen(dev, stolen);
352 i915_gem_stolen_remove_node(dev_priv, stolen);
357 struct drm_i915_gem_object *
358 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
363 struct drm_i915_private *dev_priv = dev->dev_private;
364 struct i915_address_space *ggtt = &dev_priv->gtt.base;
365 struct drm_i915_gem_object *obj;
366 struct drm_mm_node *stolen;
367 struct i915_vma *vma;
370 if (!drm_mm_initialized(&dev_priv->mm.stolen))
373 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
374 stolen_offset, gtt_offset, size);
376 /* KISS and expect everything to be page-aligned */
377 if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
378 WARN_ON(stolen_offset & 4095))
381 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
385 stolen->start = stolen_offset;
387 ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
389 DRM_DEBUG_KMS("failed to allocate stolen space\n");
394 obj = _i915_gem_object_create_stolen(dev, stolen);
396 DRM_DEBUG_KMS("failed to allocate stolen object\n");
397 i915_gem_stolen_remove_node(dev_priv, stolen);
402 /* Some objects just need physical mem from stolen space */
403 if (gtt_offset == I915_GTT_OFFSET_NONE)
406 vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt);
412 /* To simplify the initialisation sequence between KMS and GTT,
413 * we allow construction of the stolen object prior to
414 * setting up the GTT space. The actual reservation will occur
417 vma->node.start = gtt_offset;
418 vma->node.size = size;
419 if (drm_mm_initialized(&ggtt->mm)) {
420 ret = drm_mm_reserve_node(&ggtt->mm, &vma->node);
422 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
427 vma->bound |= GLOBAL_BIND;
429 list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
430 list_add_tail(&vma->mm_list, &ggtt->inactive_list);
431 i915_gem_object_pin_pages(obj);
436 i915_gem_vma_destroy(vma);
438 i915_gem_stolen_remove_node(dev_priv, stolen);
440 drm_gem_object_unreference(&obj->base);