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_in_range(struct drm_i915_private *dev_priv,
46 struct drm_mm_node *node, u64 size,
47 unsigned alignment, u64 start, u64 end)
51 if (!drm_mm_initialized(&dev_priv->mm.stolen))
54 /* WaSkipStolenMemoryFirstPage:bdw+ */
55 if (INTEL_GEN(dev_priv) >= 8 && start < 4096)
58 mutex_lock(&dev_priv->mm.stolen_lock);
59 ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node,
61 start, end, DRM_MM_INSERT_BEST);
62 mutex_unlock(&dev_priv->mm.stolen_lock);
67 int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
68 struct drm_mm_node *node, u64 size,
71 return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
72 alignment, 0, U64_MAX);
75 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
76 struct drm_mm_node *node)
78 mutex_lock(&dev_priv->mm.stolen_lock);
79 drm_mm_remove_node(node);
80 mutex_unlock(&dev_priv->mm.stolen_lock);
83 static int i915_adjust_stolen(struct drm_i915_private *dev_priv,
86 struct i915_ggtt *ggtt = &dev_priv->ggtt;
89 if (dsm->start == 0 || dsm->end <= dsm->start)
93 * TODO: We have yet too encounter the case where the GTT wasn't at the
94 * end of stolen. With that assumption we could simplify this.
97 /* Make sure we don't clobber the GTT if it's within stolen memory */
98 if (INTEL_GEN(dev_priv) <= 4 &&
99 !IS_G33(dev_priv) && !IS_PINEVIEW(dev_priv) && !IS_G4X(dev_priv)) {
100 struct resource stolen[2] = {*dsm, *dsm};
101 struct resource ggtt_res;
102 resource_size_t ggtt_start;
104 ggtt_start = I915_READ(PGTBL_CTL);
105 if (IS_GEN4(dev_priv))
106 ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
107 (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
109 ggtt_start &= PGTBL_ADDRESS_LO_MASK;
112 (struct resource) DEFINE_RES_MEM(ggtt_start,
113 ggtt_total_entries(ggtt) * 4);
115 if (ggtt_res.start >= stolen[0].start && ggtt_res.start < stolen[0].end)
116 stolen[0].end = ggtt_res.start;
117 if (ggtt_res.end > stolen[1].start && ggtt_res.end <= stolen[1].end)
118 stolen[1].start = ggtt_res.end;
120 /* Pick the larger of the two chunks */
121 if (resource_size(&stolen[0]) > resource_size(&stolen[1]))
126 if (stolen[0].start != stolen[1].start ||
127 stolen[0].end != stolen[1].end) {
128 DRM_DEBUG_DRIVER("GTT within stolen memory at %pR\n", &ggtt_res);
129 DRM_DEBUG_DRIVER("Stolen memory adjusted to %pR\n", dsm);
134 * Verify that nothing else uses this physical address. Stolen
135 * memory should be reserved by the BIOS and hidden from the
136 * kernel. So if the region is already marked as busy, something
137 * is seriously wrong.
139 r = devm_request_mem_region(dev_priv->drm.dev, dsm->start,
141 "Graphics Stolen Memory");
144 * One more attempt but this time requesting region from
145 * start + 1, as we have seen that this resolves the region
146 * conflict with the PCI Bus.
147 * This is a BIOS w/a: Some BIOS wrap stolen in the root
148 * PCI bus, but have an off-by-one error. Hence retry the
149 * reservation starting from 1 instead of 0.
150 * There's also BIOS with off-by-one on the other end.
152 r = devm_request_mem_region(dev_priv->drm.dev, dsm->start + 1,
153 resource_size(dsm) - 2,
154 "Graphics Stolen Memory");
156 * GEN3 firmware likes to smash pci bridges into the stolen
157 * range. Apparently this works.
159 if (r == NULL && !IS_GEN3(dev_priv)) {
160 DRM_ERROR("conflict detected with stolen region: %pR\n",
170 void i915_gem_cleanup_stolen(struct drm_i915_private *dev_priv)
172 if (!drm_mm_initialized(&dev_priv->mm.stolen))
175 drm_mm_takedown(&dev_priv->mm.stolen);
178 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
179 resource_size_t *base,
180 resource_size_t *size)
182 u32 reg_val = I915_READ(IS_GM45(dev_priv) ?
183 CTG_STOLEN_RESERVED :
184 ELK_STOLEN_RESERVED);
185 resource_size_t stolen_top = dev_priv->dsm.end + 1;
187 DRM_DEBUG_DRIVER("%s_STOLEN_RESERVED = %08x\n",
188 IS_GM45(dev_priv) ? "CTG" : "ELK", reg_val);
190 if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0)
194 * Whether ILK really reuses the ELK register for this is unclear.
195 * Let's see if we catch anyone with this supposedly enabled on ILK.
197 WARN(IS_GEN5(dev_priv), "ILK stolen reserved found? 0x%08x\n", reg_val);
199 if (!(reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK))
202 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
203 WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
205 *size = stolen_top - *base;
208 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
209 resource_size_t *base,
210 resource_size_t *size)
212 u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
214 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
216 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
219 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
221 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
222 case GEN6_STOLEN_RESERVED_1M:
225 case GEN6_STOLEN_RESERVED_512K:
228 case GEN6_STOLEN_RESERVED_256K:
231 case GEN6_STOLEN_RESERVED_128K:
236 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
240 static void vlv_get_stolen_reserved(struct drm_i915_private *dev_priv,
241 resource_size_t *base,
242 resource_size_t *size)
244 u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
245 resource_size_t stolen_top = dev_priv->dsm.end + 1;
247 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
249 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
252 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
254 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
256 case GEN7_STOLEN_RESERVED_1M:
262 * On vlv, the ADDR_MASK portion is left as 0 and HW deduces the
263 * reserved location as (top - size).
265 *base = stolen_top - *size;
268 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
269 resource_size_t *base,
270 resource_size_t *size)
272 u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
274 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
276 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
279 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
281 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
282 case GEN7_STOLEN_RESERVED_1M:
285 case GEN7_STOLEN_RESERVED_256K:
290 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
294 static void chv_get_stolen_reserved(struct drm_i915_private *dev_priv,
295 resource_size_t *base,
296 resource_size_t *size)
298 u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
300 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
302 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
305 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
307 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
308 case GEN8_STOLEN_RESERVED_1M:
311 case GEN8_STOLEN_RESERVED_2M:
312 *size = 2 * 1024 * 1024;
314 case GEN8_STOLEN_RESERVED_4M:
315 *size = 4 * 1024 * 1024;
317 case GEN8_STOLEN_RESERVED_8M:
318 *size = 8 * 1024 * 1024;
321 *size = 8 * 1024 * 1024;
322 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
326 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
327 resource_size_t *base,
328 resource_size_t *size)
330 u32 reg_val = I915_READ(GEN6_STOLEN_RESERVED);
331 resource_size_t stolen_top = dev_priv->dsm.end + 1;
333 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = %08x\n", reg_val);
335 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
338 if (!(reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK))
341 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
342 *size = stolen_top - *base;
345 static void icl_get_stolen_reserved(struct drm_i915_private *dev_priv,
346 resource_size_t *base,
347 resource_size_t *size)
349 u64 reg_val = I915_READ64(GEN6_STOLEN_RESERVED);
351 DRM_DEBUG_DRIVER("GEN6_STOLEN_RESERVED = 0x%016llx\n", reg_val);
353 *base = reg_val & GEN11_STOLEN_RESERVED_ADDR_MASK;
355 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
356 case GEN8_STOLEN_RESERVED_1M:
359 case GEN8_STOLEN_RESERVED_2M:
360 *size = 2 * 1024 * 1024;
362 case GEN8_STOLEN_RESERVED_4M:
363 *size = 4 * 1024 * 1024;
365 case GEN8_STOLEN_RESERVED_8M:
366 *size = 8 * 1024 * 1024;
369 *size = 8 * 1024 * 1024;
370 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
374 int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
376 resource_size_t reserved_base, stolen_top;
377 resource_size_t reserved_total, reserved_size;
379 mutex_init(&dev_priv->mm.stolen_lock);
381 if (intel_vgpu_active(dev_priv)) {
382 DRM_INFO("iGVT-g active, disabling use of stolen memory\n");
386 if (intel_vtd_active() && INTEL_GEN(dev_priv) < 8) {
387 DRM_INFO("DMAR active, disabling use of stolen memory\n");
391 if (resource_size(&intel_graphics_stolen_res) == 0)
394 dev_priv->dsm = intel_graphics_stolen_res;
396 if (i915_adjust_stolen(dev_priv, &dev_priv->dsm))
399 GEM_BUG_ON(dev_priv->dsm.start == 0);
400 GEM_BUG_ON(dev_priv->dsm.end <= dev_priv->dsm.start);
402 stolen_top = dev_priv->dsm.end + 1;
403 reserved_base = stolen_top;
406 switch (INTEL_GEN(dev_priv)) {
411 if (!IS_G4X(dev_priv))
415 g4x_get_stolen_reserved(dev_priv,
416 &reserved_base, &reserved_size);
419 gen6_get_stolen_reserved(dev_priv,
420 &reserved_base, &reserved_size);
423 if (IS_VALLEYVIEW(dev_priv))
424 vlv_get_stolen_reserved(dev_priv,
425 &reserved_base, &reserved_size);
427 gen7_get_stolen_reserved(dev_priv,
428 &reserved_base, &reserved_size);
434 chv_get_stolen_reserved(dev_priv,
435 &reserved_base, &reserved_size);
437 bdw_get_stolen_reserved(dev_priv,
438 &reserved_base, &reserved_size);
442 icl_get_stolen_reserved(dev_priv, &reserved_base,
448 * Our expectation is that the reserved space is at the top of the
449 * stolen region and *never* at the bottom. If we see !reserved_base,
450 * it likely means we failed to read the registers correctly.
452 if (!reserved_base) {
453 DRM_ERROR("inconsistent reservation %pa + %pa; ignoring\n",
454 &reserved_base, &reserved_size);
455 reserved_base = stolen_top;
459 dev_priv->dsm_reserved =
460 (struct resource) DEFINE_RES_MEM(reserved_base, reserved_size);
462 if (!resource_contains(&dev_priv->dsm, &dev_priv->dsm_reserved)) {
463 DRM_ERROR("Stolen reserved area %pR outside stolen memory %pR\n",
464 &dev_priv->dsm_reserved, &dev_priv->dsm);
468 /* It is possible for the reserved area to end before the end of stolen
469 * memory, so just consider the start. */
470 reserved_total = stolen_top - reserved_base;
472 DRM_DEBUG_DRIVER("Memory reserved for graphics device: %lluK, usable: %lluK\n",
473 (u64)resource_size(&dev_priv->dsm) >> 10,
474 ((u64)resource_size(&dev_priv->dsm) - reserved_total) >> 10);
476 dev_priv->stolen_usable_size =
477 resource_size(&dev_priv->dsm) - reserved_total;
479 /* Basic memrange allocator for stolen space. */
480 drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->stolen_usable_size);
485 static struct sg_table *
486 i915_pages_create_for_stolen(struct drm_device *dev,
487 resource_size_t offset, resource_size_t size)
489 struct drm_i915_private *dev_priv = to_i915(dev);
491 struct scatterlist *sg;
493 GEM_BUG_ON(range_overflows(offset, size, resource_size(&dev_priv->dsm)));
495 /* We hide that we have no struct page backing our stolen object
496 * by wrapping the contiguous physical allocation with a fake
497 * dma mapping in a single scatterlist.
500 st = kmalloc(sizeof(*st), GFP_KERNEL);
502 return ERR_PTR(-ENOMEM);
504 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
506 return ERR_PTR(-ENOMEM);
513 sg_dma_address(sg) = (dma_addr_t)dev_priv->dsm.start + offset;
514 sg_dma_len(sg) = size;
519 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
521 struct sg_table *pages =
522 i915_pages_create_for_stolen(obj->base.dev,
526 return PTR_ERR(pages);
528 __i915_gem_object_set_pages(obj, pages, obj->stolen->size);
533 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
534 struct sg_table *pages)
536 /* Should only be called from i915_gem_object_release_stolen() */
537 sg_free_table(pages);
542 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
544 struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
545 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
549 __i915_gem_object_unpin_pages(obj);
551 i915_gem_stolen_remove_node(dev_priv, stolen);
555 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
556 .get_pages = i915_gem_object_get_pages_stolen,
557 .put_pages = i915_gem_object_put_pages_stolen,
558 .release = i915_gem_object_release_stolen,
561 static struct drm_i915_gem_object *
562 _i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
563 struct drm_mm_node *stolen)
565 struct drm_i915_gem_object *obj;
566 unsigned int cache_level;
568 obj = i915_gem_object_alloc(dev_priv);
572 drm_gem_private_object_init(&dev_priv->drm, &obj->base, stolen->size);
573 i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
575 obj->stolen = stolen;
576 obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
577 cache_level = HAS_LLC(dev_priv) ? I915_CACHE_LLC : I915_CACHE_NONE;
578 i915_gem_object_set_cache_coherency(obj, cache_level);
580 if (i915_gem_object_pin_pages(obj))
586 i915_gem_object_free(obj);
590 struct drm_i915_gem_object *
591 i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
592 resource_size_t size)
594 struct drm_i915_gem_object *obj;
595 struct drm_mm_node *stolen;
598 if (!drm_mm_initialized(&dev_priv->mm.stolen))
604 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
608 ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
614 obj = _i915_gem_object_create_stolen(dev_priv, stolen);
618 i915_gem_stolen_remove_node(dev_priv, stolen);
623 struct drm_i915_gem_object *
624 i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv,
625 resource_size_t stolen_offset,
626 resource_size_t gtt_offset,
627 resource_size_t size)
629 struct i915_ggtt *ggtt = &dev_priv->ggtt;
630 struct drm_i915_gem_object *obj;
631 struct drm_mm_node *stolen;
632 struct i915_vma *vma;
635 if (!drm_mm_initialized(&dev_priv->mm.stolen))
638 lockdep_assert_held(&dev_priv->drm.struct_mutex);
640 DRM_DEBUG_DRIVER("creating preallocated stolen object: stolen_offset=%pa, gtt_offset=%pa, size=%pa\n",
641 &stolen_offset, >t_offset, &size);
643 /* KISS and expect everything to be page-aligned */
644 if (WARN_ON(size == 0) ||
645 WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
646 WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
649 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
653 stolen->start = stolen_offset;
655 mutex_lock(&dev_priv->mm.stolen_lock);
656 ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
657 mutex_unlock(&dev_priv->mm.stolen_lock);
659 DRM_DEBUG_DRIVER("failed to allocate stolen space\n");
664 obj = _i915_gem_object_create_stolen(dev_priv, stolen);
666 DRM_DEBUG_DRIVER("failed to allocate stolen object\n");
667 i915_gem_stolen_remove_node(dev_priv, stolen);
672 /* Some objects just need physical mem from stolen space */
673 if (gtt_offset == I915_GTT_OFFSET_NONE)
676 ret = i915_gem_object_pin_pages(obj);
680 vma = i915_vma_instance(obj, &ggtt->vm, NULL);
686 /* To simplify the initialisation sequence between KMS and GTT,
687 * we allow construction of the stolen object prior to
688 * setting up the GTT space. The actual reservation will occur
691 ret = i915_gem_gtt_reserve(&ggtt->vm, &vma->node,
692 size, gtt_offset, obj->cache_level,
695 DRM_DEBUG_DRIVER("failed to allocate stolen GTT space\n");
699 GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
701 vma->pages = obj->mm.pages;
702 vma->flags |= I915_VMA_GLOBAL_BIND;
703 __i915_vma_set_map_and_fenceable(vma);
704 list_move_tail(&vma->vm_link, &ggtt->vm.inactive_list);
706 spin_lock(&dev_priv->mm.obj_lock);
707 list_move_tail(&obj->mm.link, &dev_priv->mm.bound_list);
709 spin_unlock(&dev_priv->mm.obj_lock);
714 i915_gem_object_unpin_pages(obj);
716 i915_gem_object_put(obj);