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 (incomplete) */
59 if (INTEL_INFO(dev_priv)->gen == 8 && start < 4096)
62 mutex_lock(&dev_priv->mm.stolen_lock);
63 ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size,
64 alignment, start, end,
65 DRM_MM_SEARCH_DEFAULT);
66 mutex_unlock(&dev_priv->mm.stolen_lock);
71 int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
72 struct drm_mm_node *node, u64 size,
75 struct i915_ggtt *ggtt = &dev_priv->ggtt;
77 return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
79 ggtt->stolen_usable_size);
82 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
83 struct drm_mm_node *node)
85 mutex_lock(&dev_priv->mm.stolen_lock);
86 drm_mm_remove_node(node);
87 mutex_unlock(&dev_priv->mm.stolen_lock);
90 static unsigned long i915_stolen_to_physical(struct drm_device *dev)
92 struct drm_i915_private *dev_priv = to_i915(dev);
93 struct i915_ggtt *ggtt = &dev_priv->ggtt;
97 /* Almost universally we can find the Graphics Base of Stolen Memory
98 * at register BSM (0x5c) in the igfx configuration space. On a few
99 * (desktop) machines this is also mirrored in the bridge device at
100 * different locations, or in the MCHBAR.
102 * On 865 we just check the TOUD register.
104 * On 830/845/85x the stolen memory base isn't available in any
105 * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
109 if (INTEL_INFO(dev)->gen >= 3) {
112 pci_read_config_dword(dev->pdev, BSM, &bsm);
114 base = bsm & BSM_MASK;
115 } else if (IS_I865G(dev)) {
119 * FIXME is the graphics stolen memory region
120 * always at TOUD? Ie. is it always the last
121 * one to be allocated by the BIOS?
123 pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0),
127 } else if (IS_I85X(dev)) {
132 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
135 if (tmp & TSEG_ENABLE)
138 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 1),
142 base = tom - tseg_size - ggtt->stolen_size;
143 } else if (IS_845G(dev)) {
148 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
151 if (tmp & TSEG_ENABLE) {
152 switch (tmp & I845_TSEG_SIZE_MASK) {
153 case I845_TSEG_SIZE_512K:
156 case I845_TSEG_SIZE_1M:
162 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
166 base = tom - tseg_size - ggtt->stolen_size;
167 } else if (IS_I830(dev)) {
172 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
175 if (tmp & TSEG_ENABLE) {
176 if (tmp & I830_TSEG_SIZE_1M)
182 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
186 base = tom - tseg_size - ggtt->stolen_size;
192 /* make sure we don't clobber the GTT if it's within stolen memory */
193 if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
197 { .start = base, .end = base + ggtt->stolen_size, },
198 { .start = base, .end = base + ggtt->stolen_size, },
200 u64 ggtt_start, ggtt_end;
202 ggtt_start = I915_READ(PGTBL_CTL);
204 ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
205 (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
207 ggtt_start &= PGTBL_ADDRESS_LO_MASK;
208 ggtt_end = ggtt_start + ggtt_total_entries(ggtt) * 4;
210 if (ggtt_start >= stolen[0].start && ggtt_start < stolen[0].end)
211 stolen[0].end = ggtt_start;
212 if (ggtt_end > stolen[1].start && ggtt_end <= stolen[1].end)
213 stolen[1].start = ggtt_end;
215 /* pick the larger of the two chunks */
216 if (stolen[0].end - stolen[0].start >
217 stolen[1].end - stolen[1].start) {
218 base = stolen[0].start;
219 ggtt->stolen_size = stolen[0].end - stolen[0].start;
221 base = stolen[1].start;
222 ggtt->stolen_size = stolen[1].end - stolen[1].start;
225 if (stolen[0].start != stolen[1].start ||
226 stolen[0].end != stolen[1].end) {
227 DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
228 (unsigned long long)ggtt_start,
229 (unsigned long long)ggtt_end - 1);
230 DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
231 base, base + (u32)ggtt->stolen_size - 1);
236 /* Verify that nothing else uses this physical address. Stolen
237 * memory should be reserved by the BIOS and hidden from the
238 * kernel. So if the region is already marked as busy, something
239 * is seriously wrong.
241 r = devm_request_mem_region(dev->dev, base, ggtt->stolen_size,
242 "Graphics Stolen Memory");
245 * One more attempt but this time requesting region from
246 * base + 1, as we have seen that this resolves the region
247 * conflict with the PCI Bus.
248 * This is a BIOS w/a: Some BIOS wrap stolen in the root
249 * PCI bus, but have an off-by-one error. Hence retry the
250 * reservation starting from 1 instead of 0.
252 r = devm_request_mem_region(dev->dev, base + 1,
253 ggtt->stolen_size - 1,
254 "Graphics Stolen Memory");
256 * GEN3 firmware likes to smash pci bridges into the stolen
257 * range. Apparently this works.
259 if (r == NULL && !IS_GEN3(dev)) {
260 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
261 base, base + (uint32_t)ggtt->stolen_size);
269 void i915_gem_cleanup_stolen(struct drm_device *dev)
271 struct drm_i915_private *dev_priv = dev->dev_private;
273 if (!drm_mm_initialized(&dev_priv->mm.stolen))
276 drm_mm_takedown(&dev_priv->mm.stolen);
279 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
280 unsigned long *base, unsigned long *size)
282 struct i915_ggtt *ggtt = &dev_priv->ggtt;
283 uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
284 CTG_STOLEN_RESERVED :
285 ELK_STOLEN_RESERVED);
286 unsigned long stolen_top = dev_priv->mm.stolen_base +
289 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
291 WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
293 /* On these platforms, the register doesn't have a size field, so the
294 * size is the distance between the base and the top of the stolen
295 * memory. We also have the genuine case where base is zero and there's
296 * nothing reserved. */
300 *size = stolen_top - *base;
303 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
304 unsigned long *base, unsigned long *size)
306 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
308 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
310 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
311 case GEN6_STOLEN_RESERVED_1M:
314 case GEN6_STOLEN_RESERVED_512K:
317 case GEN6_STOLEN_RESERVED_256K:
320 case GEN6_STOLEN_RESERVED_128K:
325 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
329 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
330 unsigned long *base, unsigned long *size)
332 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
334 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
336 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
337 case GEN7_STOLEN_RESERVED_1M:
340 case GEN7_STOLEN_RESERVED_256K:
345 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
349 static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv,
350 unsigned long *base, unsigned long *size)
352 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
354 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
356 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
357 case GEN8_STOLEN_RESERVED_1M:
360 case GEN8_STOLEN_RESERVED_2M:
361 *size = 2 * 1024 * 1024;
363 case GEN8_STOLEN_RESERVED_4M:
364 *size = 4 * 1024 * 1024;
366 case GEN8_STOLEN_RESERVED_8M:
367 *size = 8 * 1024 * 1024;
370 *size = 8 * 1024 * 1024;
371 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
375 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
376 unsigned long *base, unsigned long *size)
378 struct i915_ggtt *ggtt = &dev_priv->ggtt;
379 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
380 unsigned long stolen_top;
382 stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
384 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
386 /* On these platforms, the register doesn't have a size field, so the
387 * size is the distance between the base and the top of the stolen
388 * memory. We also have the genuine case where base is zero and there's
389 * nothing reserved. */
393 *size = stolen_top - *base;
396 int i915_gem_init_stolen(struct drm_device *dev)
398 struct drm_i915_private *dev_priv = to_i915(dev);
399 struct i915_ggtt *ggtt = &dev_priv->ggtt;
400 unsigned long reserved_total, reserved_base = 0, reserved_size;
401 unsigned long stolen_top;
403 mutex_init(&dev_priv->mm.stolen_lock);
405 #ifdef CONFIG_INTEL_IOMMU
406 if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
407 DRM_INFO("DMAR active, disabling use of stolen memory\n");
412 if (ggtt->stolen_size == 0)
415 dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
416 if (dev_priv->mm.stolen_base == 0)
419 stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
421 switch (INTEL_INFO(dev_priv)->gen) {
427 g4x_get_stolen_reserved(dev_priv, &reserved_base,
431 /* Assume the gen6 maximum for the older platforms. */
432 reserved_size = 1024 * 1024;
433 reserved_base = stolen_top - reserved_size;
436 gen6_get_stolen_reserved(dev_priv, &reserved_base,
440 gen7_get_stolen_reserved(dev_priv, &reserved_base,
444 if (IS_BROADWELL(dev_priv) ||
445 IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev))
446 bdw_get_stolen_reserved(dev_priv, &reserved_base,
449 gen8_get_stolen_reserved(dev_priv, &reserved_base,
454 /* It is possible for the reserved base to be zero, but the register
455 * field for size doesn't have a zero option. */
456 if (reserved_base == 0) {
458 reserved_base = stolen_top;
461 if (reserved_base < dev_priv->mm.stolen_base ||
462 reserved_base + reserved_size > stolen_top) {
463 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
464 reserved_base, reserved_base + reserved_size,
465 dev_priv->mm.stolen_base, stolen_top);
469 ggtt->stolen_reserved_base = reserved_base;
470 ggtt->stolen_reserved_size = reserved_size;
472 /* It is possible for the reserved area to end before the end of stolen
473 * memory, so just consider the start. */
474 reserved_total = stolen_top - reserved_base;
476 DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
477 ggtt->stolen_size >> 10,
478 (ggtt->stolen_size - reserved_total) >> 10);
480 ggtt->stolen_usable_size = ggtt->stolen_size - reserved_total;
483 * Basic memrange allocator for stolen space.
485 * TODO: Notice that some platforms require us to not use the first page
486 * of the stolen memory but their BIOSes may still put the framebuffer
487 * on the first page. So we don't reserve this page for now because of
488 * that. Our current solution is to just prevent new nodes from being
489 * inserted on the first page - see the check we have at
490 * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
493 drm_mm_init(&dev_priv->mm.stolen, 0, ggtt->stolen_usable_size);
498 static struct sg_table *
499 i915_pages_create_for_stolen(struct drm_device *dev,
500 u32 offset, u32 size)
502 struct drm_i915_private *dev_priv = to_i915(dev);
503 struct i915_ggtt *ggtt = &dev_priv->ggtt;
505 struct scatterlist *sg;
507 DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
508 BUG_ON(offset > ggtt->stolen_size - size);
510 /* We hide that we have no struct page backing our stolen object
511 * by wrapping the contiguous physical allocation with a fake
512 * dma mapping in a single scatterlist.
515 st = kmalloc(sizeof(*st), GFP_KERNEL);
519 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
528 sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
529 sg_dma_len(sg) = size;
534 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
540 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
542 /* Should only be called during free */
543 sg_free_table(obj->pages);
549 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
551 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
554 i915_gem_stolen_remove_node(dev_priv, obj->stolen);
559 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
560 .get_pages = i915_gem_object_get_pages_stolen,
561 .put_pages = i915_gem_object_put_pages_stolen,
562 .release = i915_gem_object_release_stolen,
565 static struct drm_i915_gem_object *
566 _i915_gem_object_create_stolen(struct drm_device *dev,
567 struct drm_mm_node *stolen)
569 struct drm_i915_gem_object *obj;
571 obj = i915_gem_object_alloc(dev);
575 drm_gem_private_object_init(dev, &obj->base, stolen->size);
576 i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
578 obj->pages = i915_pages_create_for_stolen(dev,
579 stolen->start, stolen->size);
580 if (obj->pages == NULL)
583 obj->get_page.sg = obj->pages->sgl;
584 obj->get_page.last = 0;
586 i915_gem_object_pin_pages(obj);
587 obj->stolen = stolen;
589 obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
590 obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
595 i915_gem_object_free(obj);
599 struct drm_i915_gem_object *
600 i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
602 struct drm_i915_private *dev_priv = dev->dev_private;
603 struct drm_i915_gem_object *obj;
604 struct drm_mm_node *stolen;
607 if (!drm_mm_initialized(&dev_priv->mm.stolen))
610 DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
614 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
618 ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
624 obj = _i915_gem_object_create_stolen(dev, stolen);
628 i915_gem_stolen_remove_node(dev_priv, stolen);
633 struct drm_i915_gem_object *
634 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
639 struct drm_i915_private *dev_priv = to_i915(dev);
640 struct i915_ggtt *ggtt = &dev_priv->ggtt;
641 struct drm_i915_gem_object *obj;
642 struct drm_mm_node *stolen;
643 struct i915_vma *vma;
646 if (!drm_mm_initialized(&dev_priv->mm.stolen))
649 lockdep_assert_held(&dev->struct_mutex);
651 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
652 stolen_offset, gtt_offset, size);
654 /* KISS and expect everything to be page-aligned */
655 if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
656 WARN_ON(stolen_offset & 4095))
659 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
663 stolen->start = stolen_offset;
665 mutex_lock(&dev_priv->mm.stolen_lock);
666 ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
667 mutex_unlock(&dev_priv->mm.stolen_lock);
669 DRM_DEBUG_KMS("failed to allocate stolen space\n");
674 obj = _i915_gem_object_create_stolen(dev, stolen);
676 DRM_DEBUG_KMS("failed to allocate stolen object\n");
677 i915_gem_stolen_remove_node(dev_priv, stolen);
682 /* Some objects just need physical mem from stolen space */
683 if (gtt_offset == I915_GTT_OFFSET_NONE)
686 vma = i915_gem_obj_lookup_or_create_vma(obj, &ggtt->base);
692 /* To simplify the initialisation sequence between KMS and GTT,
693 * we allow construction of the stolen object prior to
694 * setting up the GTT space. The actual reservation will occur
697 vma->node.start = gtt_offset;
698 vma->node.size = size;
699 if (drm_mm_initialized(&ggtt->base.mm)) {
700 ret = drm_mm_reserve_node(&ggtt->base.mm, &vma->node);
702 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
706 vma->bound |= GLOBAL_BIND;
707 __i915_vma_set_map_and_fenceable(vma);
708 list_add_tail(&vma->vm_link, &ggtt->base.inactive_list);
711 list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
712 i915_gem_object_pin_pages(obj);
717 drm_gem_object_unreference(&obj->base);