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>
33 #define KB(x) ((x) * 1024)
34 #define MB(x) (KB(x) * 1024)
37 * The BIOS typically reserves some of the system's memory for the exclusive
38 * use of the integrated graphics. This memory is no longer available for
39 * use by the OS and so the user finds that his system has less memory
40 * available than he put in. We refer to this memory as stolen.
42 * The BIOS will allocate its framebuffer from the stolen memory. Our
43 * goal is try to reuse that object for our own fbcon which must always
44 * be available for panics. Anything else we can reuse the stolen memory
48 int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv,
49 struct drm_mm_node *node, u64 size,
50 unsigned alignment, u64 start, u64 end)
54 if (!drm_mm_initialized(&dev_priv->mm.stolen))
57 /* See the comment at the drm_mm_init() call for more about this check.
58 * WaSkipStolenMemoryFirstPage:bdw,chv,kbl (incomplete)
60 if (start < 4096 && (IS_GEN8(dev_priv) ||
61 IS_KBL_REVID(dev_priv, 0, KBL_REVID_A0)))
64 mutex_lock(&dev_priv->mm.stolen_lock);
65 ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size,
66 alignment, start, end,
67 DRM_MM_SEARCH_DEFAULT);
68 mutex_unlock(&dev_priv->mm.stolen_lock);
73 int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
74 struct drm_mm_node *node, u64 size,
77 struct i915_ggtt *ggtt = &dev_priv->ggtt;
79 return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
81 ggtt->stolen_usable_size);
84 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
85 struct drm_mm_node *node)
87 mutex_lock(&dev_priv->mm.stolen_lock);
88 drm_mm_remove_node(node);
89 mutex_unlock(&dev_priv->mm.stolen_lock);
92 static unsigned long i915_stolen_to_physical(struct drm_device *dev)
94 struct drm_i915_private *dev_priv = to_i915(dev);
95 struct i915_ggtt *ggtt = &dev_priv->ggtt;
99 /* Almost universally we can find the Graphics Base of Stolen Memory
100 * at register BSM (0x5c) in the igfx configuration space. On a few
101 * (desktop) machines this is also mirrored in the bridge device at
102 * different locations, or in the MCHBAR.
104 * On 865 we just check the TOUD register.
106 * On 830/845/85x the stolen memory base isn't available in any
107 * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
111 if (INTEL_INFO(dev)->gen >= 3) {
114 pci_read_config_dword(dev->pdev, INTEL_BSM, &bsm);
116 base = bsm & INTEL_BSM_MASK;
117 } else if (IS_I865G(dev)) {
121 * FIXME is the graphics stolen memory region
122 * always at TOUD? Ie. is it always the last
123 * one to be allocated by the BIOS?
125 pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0),
129 } else if (IS_I85X(dev)) {
134 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
137 if (tmp & TSEG_ENABLE)
140 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 1),
144 base = tom - tseg_size - ggtt->stolen_size;
145 } else if (IS_845G(dev)) {
150 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
153 if (tmp & TSEG_ENABLE) {
154 switch (tmp & I845_TSEG_SIZE_MASK) {
155 case I845_TSEG_SIZE_512K:
158 case I845_TSEG_SIZE_1M:
164 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
168 base = tom - tseg_size - ggtt->stolen_size;
169 } else if (IS_I830(dev)) {
174 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
177 if (tmp & TSEG_ENABLE) {
178 if (tmp & I830_TSEG_SIZE_1M)
184 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
188 base = tom - tseg_size - ggtt->stolen_size;
194 /* make sure we don't clobber the GTT if it's within stolen memory */
195 if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
199 { .start = base, .end = base + ggtt->stolen_size, },
200 { .start = base, .end = base + ggtt->stolen_size, },
202 u64 ggtt_start, ggtt_end;
204 ggtt_start = I915_READ(PGTBL_CTL);
206 ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
207 (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
209 ggtt_start &= PGTBL_ADDRESS_LO_MASK;
210 ggtt_end = ggtt_start + ggtt_total_entries(ggtt) * 4;
212 if (ggtt_start >= stolen[0].start && ggtt_start < stolen[0].end)
213 stolen[0].end = ggtt_start;
214 if (ggtt_end > stolen[1].start && ggtt_end <= stolen[1].end)
215 stolen[1].start = ggtt_end;
217 /* pick the larger of the two chunks */
218 if (stolen[0].end - stolen[0].start >
219 stolen[1].end - stolen[1].start) {
220 base = stolen[0].start;
221 ggtt->stolen_size = stolen[0].end - stolen[0].start;
223 base = stolen[1].start;
224 ggtt->stolen_size = stolen[1].end - stolen[1].start;
227 if (stolen[0].start != stolen[1].start ||
228 stolen[0].end != stolen[1].end) {
229 DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
230 (unsigned long long)ggtt_start,
231 (unsigned long long)ggtt_end - 1);
232 DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
233 base, base + (u32)ggtt->stolen_size - 1);
238 /* Verify that nothing else uses this physical address. Stolen
239 * memory should be reserved by the BIOS and hidden from the
240 * kernel. So if the region is already marked as busy, something
241 * is seriously wrong.
243 r = devm_request_mem_region(dev->dev, base, ggtt->stolen_size,
244 "Graphics Stolen Memory");
247 * One more attempt but this time requesting region from
248 * base + 1, as we have seen that this resolves the region
249 * conflict with the PCI Bus.
250 * This is a BIOS w/a: Some BIOS wrap stolen in the root
251 * PCI bus, but have an off-by-one error. Hence retry the
252 * reservation starting from 1 instead of 0.
254 r = devm_request_mem_region(dev->dev, base + 1,
255 ggtt->stolen_size - 1,
256 "Graphics Stolen Memory");
258 * GEN3 firmware likes to smash pci bridges into the stolen
259 * range. Apparently this works.
261 if (r == NULL && !IS_GEN3(dev)) {
262 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
263 base, base + (uint32_t)ggtt->stolen_size);
271 void i915_gem_cleanup_stolen(struct drm_device *dev)
273 struct drm_i915_private *dev_priv = to_i915(dev);
275 if (!drm_mm_initialized(&dev_priv->mm.stolen))
278 drm_mm_takedown(&dev_priv->mm.stolen);
281 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
282 unsigned long *base, unsigned long *size)
284 struct i915_ggtt *ggtt = &dev_priv->ggtt;
285 uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
286 CTG_STOLEN_RESERVED :
287 ELK_STOLEN_RESERVED);
288 unsigned long stolen_top = dev_priv->mm.stolen_base +
291 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
293 WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
295 /* On these platforms, the register doesn't have a size field, so the
296 * size is the distance between the base and the top of the stolen
297 * memory. We also have the genuine case where base is zero and there's
298 * nothing reserved. */
302 *size = stolen_top - *base;
305 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
306 unsigned long *base, unsigned long *size)
308 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
310 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
312 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
313 case GEN6_STOLEN_RESERVED_1M:
316 case GEN6_STOLEN_RESERVED_512K:
319 case GEN6_STOLEN_RESERVED_256K:
322 case GEN6_STOLEN_RESERVED_128K:
327 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
331 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
332 unsigned long *base, unsigned long *size)
334 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
336 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
338 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
339 case GEN7_STOLEN_RESERVED_1M:
342 case GEN7_STOLEN_RESERVED_256K:
347 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
351 static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv,
352 unsigned long *base, unsigned long *size)
354 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
356 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
358 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
359 case GEN8_STOLEN_RESERVED_1M:
362 case GEN8_STOLEN_RESERVED_2M:
363 *size = 2 * 1024 * 1024;
365 case GEN8_STOLEN_RESERVED_4M:
366 *size = 4 * 1024 * 1024;
368 case GEN8_STOLEN_RESERVED_8M:
369 *size = 8 * 1024 * 1024;
372 *size = 8 * 1024 * 1024;
373 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
377 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
378 unsigned long *base, unsigned long *size)
380 struct i915_ggtt *ggtt = &dev_priv->ggtt;
381 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
382 unsigned long stolen_top;
384 stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
386 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
388 /* On these platforms, the register doesn't have a size field, so the
389 * size is the distance between the base and the top of the stolen
390 * memory. We also have the genuine case where base is zero and there's
391 * nothing reserved. */
395 *size = stolen_top - *base;
398 int i915_gem_init_stolen(struct drm_device *dev)
400 struct drm_i915_private *dev_priv = to_i915(dev);
401 struct i915_ggtt *ggtt = &dev_priv->ggtt;
402 unsigned long reserved_total, reserved_base = 0, reserved_size;
403 unsigned long stolen_top;
405 mutex_init(&dev_priv->mm.stolen_lock);
407 #ifdef CONFIG_INTEL_IOMMU
408 if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
409 DRM_INFO("DMAR active, disabling use of stolen memory\n");
414 if (ggtt->stolen_size == 0)
417 dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
418 if (dev_priv->mm.stolen_base == 0)
421 stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
423 switch (INTEL_INFO(dev_priv)->gen) {
429 g4x_get_stolen_reserved(dev_priv, &reserved_base,
433 /* Assume the gen6 maximum for the older platforms. */
434 reserved_size = 1024 * 1024;
435 reserved_base = stolen_top - reserved_size;
438 gen6_get_stolen_reserved(dev_priv, &reserved_base,
442 gen7_get_stolen_reserved(dev_priv, &reserved_base,
446 if (IS_BROADWELL(dev_priv) ||
447 IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev))
448 bdw_get_stolen_reserved(dev_priv, &reserved_base,
451 gen8_get_stolen_reserved(dev_priv, &reserved_base,
456 /* It is possible for the reserved base to be zero, but the register
457 * field for size doesn't have a zero option. */
458 if (reserved_base == 0) {
460 reserved_base = stolen_top;
463 if (reserved_base < dev_priv->mm.stolen_base ||
464 reserved_base + reserved_size > stolen_top) {
465 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
466 reserved_base, reserved_base + reserved_size,
467 dev_priv->mm.stolen_base, stolen_top);
471 ggtt->stolen_reserved_base = reserved_base;
472 ggtt->stolen_reserved_size = reserved_size;
474 /* It is possible for the reserved area to end before the end of stolen
475 * memory, so just consider the start. */
476 reserved_total = stolen_top - reserved_base;
478 DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
479 ggtt->stolen_size >> 10,
480 (ggtt->stolen_size - reserved_total) >> 10);
482 ggtt->stolen_usable_size = ggtt->stolen_size - reserved_total;
485 * Basic memrange allocator for stolen space.
487 * TODO: Notice that some platforms require us to not use the first page
488 * of the stolen memory but their BIOSes may still put the framebuffer
489 * on the first page. So we don't reserve this page for now because of
490 * that. Our current solution is to just prevent new nodes from being
491 * inserted on the first page - see the check we have at
492 * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
495 drm_mm_init(&dev_priv->mm.stolen, 0, ggtt->stolen_usable_size);
500 static struct sg_table *
501 i915_pages_create_for_stolen(struct drm_device *dev,
502 u32 offset, u32 size)
504 struct drm_i915_private *dev_priv = to_i915(dev);
505 struct i915_ggtt *ggtt = &dev_priv->ggtt;
507 struct scatterlist *sg;
509 DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
510 BUG_ON(offset > ggtt->stolen_size - size);
512 /* We hide that we have no struct page backing our stolen object
513 * by wrapping the contiguous physical allocation with a fake
514 * dma mapping in a single scatterlist.
517 st = kmalloc(sizeof(*st), GFP_KERNEL);
521 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
530 sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
531 sg_dma_len(sg) = size;
536 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
542 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
544 /* Should only be called during free */
545 sg_free_table(obj->pages);
551 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
553 struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
556 i915_gem_stolen_remove_node(dev_priv, obj->stolen);
561 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
562 .get_pages = i915_gem_object_get_pages_stolen,
563 .put_pages = i915_gem_object_put_pages_stolen,
564 .release = i915_gem_object_release_stolen,
567 static struct drm_i915_gem_object *
568 _i915_gem_object_create_stolen(struct drm_device *dev,
569 struct drm_mm_node *stolen)
571 struct drm_i915_gem_object *obj;
573 obj = i915_gem_object_alloc(dev);
577 drm_gem_private_object_init(dev, &obj->base, stolen->size);
578 i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
580 obj->pages = i915_pages_create_for_stolen(dev,
581 stolen->start, stolen->size);
582 if (obj->pages == NULL)
585 obj->get_page.sg = obj->pages->sgl;
586 obj->get_page.last = 0;
588 i915_gem_object_pin_pages(obj);
589 obj->stolen = stolen;
591 obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
592 obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
597 i915_gem_object_free(obj);
601 struct drm_i915_gem_object *
602 i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
604 struct drm_i915_private *dev_priv = to_i915(dev);
605 struct drm_i915_gem_object *obj;
606 struct drm_mm_node *stolen;
609 if (!drm_mm_initialized(&dev_priv->mm.stolen))
612 DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
616 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
620 ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
626 obj = _i915_gem_object_create_stolen(dev, stolen);
630 i915_gem_stolen_remove_node(dev_priv, stolen);
635 struct drm_i915_gem_object *
636 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
641 struct drm_i915_private *dev_priv = to_i915(dev);
642 struct i915_ggtt *ggtt = &dev_priv->ggtt;
643 struct drm_i915_gem_object *obj;
644 struct drm_mm_node *stolen;
645 struct i915_vma *vma;
648 if (!drm_mm_initialized(&dev_priv->mm.stolen))
651 lockdep_assert_held(&dev->struct_mutex);
653 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
654 stolen_offset, gtt_offset, size);
656 /* KISS and expect everything to be page-aligned */
657 if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
658 WARN_ON(stolen_offset & 4095))
661 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
665 stolen->start = stolen_offset;
667 mutex_lock(&dev_priv->mm.stolen_lock);
668 ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
669 mutex_unlock(&dev_priv->mm.stolen_lock);
671 DRM_DEBUG_KMS("failed to allocate stolen space\n");
676 obj = _i915_gem_object_create_stolen(dev, stolen);
678 DRM_DEBUG_KMS("failed to allocate stolen object\n");
679 i915_gem_stolen_remove_node(dev_priv, stolen);
684 /* Some objects just need physical mem from stolen space */
685 if (gtt_offset == I915_GTT_OFFSET_NONE)
688 vma = i915_gem_obj_lookup_or_create_vma(obj, &ggtt->base);
694 /* To simplify the initialisation sequence between KMS and GTT,
695 * we allow construction of the stolen object prior to
696 * setting up the GTT space. The actual reservation will occur
699 vma->node.start = gtt_offset;
700 vma->node.size = size;
701 if (drm_mm_initialized(&ggtt->base.mm)) {
702 ret = drm_mm_reserve_node(&ggtt->base.mm, &vma->node);
704 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
708 vma->bound |= GLOBAL_BIND;
709 __i915_vma_set_map_and_fenceable(vma);
710 list_add_tail(&vma->vm_link, &ggtt->base.inactive_list);
713 list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
714 i915_gem_object_pin_pages(obj);
719 drm_gem_object_unreference(&obj->base);