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,
51 if (!drm_mm_initialized(&dev_priv->mm.stolen))
54 mutex_lock(&dev_priv->mm.stolen_lock);
55 ret = drm_mm_insert_node(&dev_priv->mm.stolen, node, size, alignment,
56 DRM_MM_SEARCH_DEFAULT);
57 mutex_unlock(&dev_priv->mm.stolen_lock);
62 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
63 struct drm_mm_node *node)
65 mutex_lock(&dev_priv->mm.stolen_lock);
66 drm_mm_remove_node(node);
67 mutex_unlock(&dev_priv->mm.stolen_lock);
70 static unsigned long i915_stolen_to_physical(struct drm_device *dev)
72 struct drm_i915_private *dev_priv = dev->dev_private;
76 /* Almost universally we can find the Graphics Base of Stolen Memory
77 * at offset 0x5c in the igfx configuration space. On a few (desktop)
78 * machines this is also mirrored in the bridge device at different
79 * locations, or in the MCHBAR. On gen2, the layout is again slightly
80 * different with the Graphics Segment immediately following Top of
81 * Memory (or Top of Usable DRAM). Note it appears that TOUD is only
82 * reported by 865g, so we just use the top of memory as determined
85 * XXX However gen2 requires an unavailable symbol.
88 if (INTEL_INFO(dev)->gen >= 3) {
89 /* Read Graphics Base of Stolen Memory directly */
90 pci_read_config_dword(dev->pdev, 0x5c, &base);
91 base &= ~((1<<20) - 1);
94 /* Stolen is immediately above Top of Memory */
95 base = max_low_pfn_mapped << PAGE_SHIFT;
102 /* make sure we don't clobber the GTT if it's within stolen memory */
103 if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
107 { .start = base, .end = base + dev_priv->gtt.stolen_size, },
108 { .start = base, .end = base + dev_priv->gtt.stolen_size, },
110 u64 gtt_start, gtt_end;
112 gtt_start = I915_READ(PGTBL_CTL);
114 gtt_start = (gtt_start & PGTBL_ADDRESS_LO_MASK) |
115 (gtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
117 gtt_start &= PGTBL_ADDRESS_LO_MASK;
118 gtt_end = gtt_start + gtt_total_entries(dev_priv->gtt) * 4;
120 if (gtt_start >= stolen[0].start && gtt_start < stolen[0].end)
121 stolen[0].end = gtt_start;
122 if (gtt_end > stolen[1].start && gtt_end <= stolen[1].end)
123 stolen[1].start = gtt_end;
125 /* pick the larger of the two chunks */
126 if (stolen[0].end - stolen[0].start >
127 stolen[1].end - stolen[1].start) {
128 base = stolen[0].start;
129 dev_priv->gtt.stolen_size = stolen[0].end - stolen[0].start;
131 base = stolen[1].start;
132 dev_priv->gtt.stolen_size = stolen[1].end - stolen[1].start;
135 if (stolen[0].start != stolen[1].start ||
136 stolen[0].end != stolen[1].end) {
137 DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
138 (unsigned long long) gtt_start,
139 (unsigned long long) gtt_end - 1);
140 DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
141 base, base + (u32) dev_priv->gtt.stolen_size - 1);
146 /* Verify that nothing else uses this physical address. Stolen
147 * memory should be reserved by the BIOS and hidden from the
148 * kernel. So if the region is already marked as busy, something
149 * is seriously wrong.
151 r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size,
152 "Graphics Stolen Memory");
155 * One more attempt but this time requesting region from
156 * base + 1, as we have seen that this resolves the region
157 * conflict with the PCI Bus.
158 * This is a BIOS w/a: Some BIOS wrap stolen in the root
159 * PCI bus, but have an off-by-one error. Hence retry the
160 * reservation starting from 1 instead of 0.
162 r = devm_request_mem_region(dev->dev, base + 1,
163 dev_priv->gtt.stolen_size - 1,
164 "Graphics Stolen Memory");
166 * GEN3 firmware likes to smash pci bridges into the stolen
167 * range. Apparently this works.
169 if (r == NULL && !IS_GEN3(dev)) {
170 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
171 base, base + (uint32_t)dev_priv->gtt.stolen_size);
179 void i915_gem_cleanup_stolen(struct drm_device *dev)
181 struct drm_i915_private *dev_priv = dev->dev_private;
183 if (!drm_mm_initialized(&dev_priv->mm.stolen))
186 drm_mm_takedown(&dev_priv->mm.stolen);
189 int i915_gem_init_stolen(struct drm_device *dev)
191 struct drm_i915_private *dev_priv = dev->dev_private;
193 int bios_reserved = 0;
195 mutex_init(&dev_priv->mm.stolen_lock);
197 #ifdef CONFIG_INTEL_IOMMU
198 if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
199 DRM_INFO("DMAR active, disabling use of stolen memory\n");
204 if (dev_priv->gtt.stolen_size == 0)
207 dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
208 if (dev_priv->mm.stolen_base == 0)
211 DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
212 dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);
214 if (INTEL_INFO(dev)->gen >= 8) {
215 tmp = I915_READ(GEN7_BIOS_RESERVED);
216 tmp >>= GEN8_BIOS_RESERVED_SHIFT;
217 tmp &= GEN8_BIOS_RESERVED_MASK;
218 bios_reserved = (1024*1024) << tmp;
219 } else if (IS_GEN7(dev)) {
220 tmp = I915_READ(GEN7_BIOS_RESERVED);
221 bios_reserved = tmp & GEN7_BIOS_RESERVED_256K ?
222 256*1024 : 1024*1024;
225 if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size))
228 /* Basic memrange allocator for stolen space */
229 drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size -
235 static struct sg_table *
236 i915_pages_create_for_stolen(struct drm_device *dev,
237 u32 offset, u32 size)
239 struct drm_i915_private *dev_priv = dev->dev_private;
241 struct scatterlist *sg;
243 DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
244 BUG_ON(offset > dev_priv->gtt.stolen_size - size);
246 /* We hide that we have no struct page backing our stolen object
247 * by wrapping the contiguous physical allocation with a fake
248 * dma mapping in a single scatterlist.
251 st = kmalloc(sizeof(*st), GFP_KERNEL);
255 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
264 sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
265 sg_dma_len(sg) = size;
270 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
276 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
278 /* Should only be called during free */
279 sg_free_table(obj->pages);
285 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
287 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
290 i915_gem_stolen_remove_node(dev_priv, obj->stolen);
295 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
296 .get_pages = i915_gem_object_get_pages_stolen,
297 .put_pages = i915_gem_object_put_pages_stolen,
298 .release = i915_gem_object_release_stolen,
301 static struct drm_i915_gem_object *
302 _i915_gem_object_create_stolen(struct drm_device *dev,
303 struct drm_mm_node *stolen)
305 struct drm_i915_gem_object *obj;
307 obj = i915_gem_object_alloc(dev);
311 drm_gem_private_object_init(dev, &obj->base, stolen->size);
312 i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
314 obj->pages = i915_pages_create_for_stolen(dev,
315 stolen->start, stolen->size);
316 if (obj->pages == NULL)
319 i915_gem_object_pin_pages(obj);
320 obj->stolen = stolen;
322 obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
323 obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
328 i915_gem_object_free(obj);
332 struct drm_i915_gem_object *
333 i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
335 struct drm_i915_private *dev_priv = dev->dev_private;
336 struct drm_i915_gem_object *obj;
337 struct drm_mm_node *stolen;
340 if (!drm_mm_initialized(&dev_priv->mm.stolen))
343 DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
347 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
351 ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
357 obj = _i915_gem_object_create_stolen(dev, stolen);
361 i915_gem_stolen_remove_node(dev_priv, stolen);
366 struct drm_i915_gem_object *
367 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
372 struct drm_i915_private *dev_priv = dev->dev_private;
373 struct i915_address_space *ggtt = &dev_priv->gtt.base;
374 struct drm_i915_gem_object *obj;
375 struct drm_mm_node *stolen;
376 struct i915_vma *vma;
379 if (!drm_mm_initialized(&dev_priv->mm.stolen))
382 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
383 stolen_offset, gtt_offset, size);
385 /* KISS and expect everything to be page-aligned */
386 if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
387 WARN_ON(stolen_offset & 4095))
390 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
394 stolen->start = stolen_offset;
396 mutex_lock(&dev_priv->mm.stolen_lock);
397 ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
398 mutex_unlock(&dev_priv->mm.stolen_lock);
400 DRM_DEBUG_KMS("failed to allocate stolen space\n");
405 obj = _i915_gem_object_create_stolen(dev, stolen);
407 DRM_DEBUG_KMS("failed to allocate stolen object\n");
408 i915_gem_stolen_remove_node(dev_priv, stolen);
413 /* Some objects just need physical mem from stolen space */
414 if (gtt_offset == I915_GTT_OFFSET_NONE)
417 vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt);
423 /* To simplify the initialisation sequence between KMS and GTT,
424 * we allow construction of the stolen object prior to
425 * setting up the GTT space. The actual reservation will occur
428 vma->node.start = gtt_offset;
429 vma->node.size = size;
430 if (drm_mm_initialized(&ggtt->mm)) {
431 ret = drm_mm_reserve_node(&ggtt->mm, &vma->node);
433 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
438 vma->bound |= GLOBAL_BIND;
440 list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
441 list_add_tail(&vma->mm_list, &ggtt->inactive_list);
442 i915_gem_object_pin_pages(obj);
447 i915_gem_vma_destroy(vma);
449 i915_gem_stolen_remove_node(dev_priv, stolen);
451 drm_gem_object_unreference(&obj->base);