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 pci_dev *pdev = dev_priv->drm.pdev;
96 struct i915_ggtt *ggtt = &dev_priv->ggtt;
100 /* Almost universally we can find the Graphics Base of Stolen Memory
101 * at register BSM (0x5c) in the igfx configuration space. On a few
102 * (desktop) machines this is also mirrored in the bridge device at
103 * different locations, or in the MCHBAR.
105 * On 865 we just check the TOUD register.
107 * On 830/845/85x the stolen memory base isn't available in any
108 * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
112 if (INTEL_INFO(dev)->gen >= 3) {
115 pci_read_config_dword(pdev, INTEL_BSM, &bsm);
117 base = bsm & INTEL_BSM_MASK;
118 } else if (IS_I865G(dev)) {
123 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
126 if (tmp & TSEG_ENABLE) {
127 switch (tmp & I845_TSEG_SIZE_MASK) {
128 case I845_TSEG_SIZE_512K:
131 case I845_TSEG_SIZE_1M:
137 pci_bus_read_config_word(pdev->bus, PCI_DEVFN(0, 0),
140 base = (toud << 16) + tseg_size;
141 } else if (IS_I85X(dev)) {
146 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
149 if (tmp & TSEG_ENABLE)
152 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 1),
156 base = tom - tseg_size - ggtt->stolen_size;
157 } else if (IS_845G(dev)) {
162 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
165 if (tmp & TSEG_ENABLE) {
166 switch (tmp & I845_TSEG_SIZE_MASK) {
167 case I845_TSEG_SIZE_512K:
170 case I845_TSEG_SIZE_1M:
176 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
180 base = tom - tseg_size - ggtt->stolen_size;
181 } else if (IS_I830(dev)) {
186 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
189 if (tmp & TSEG_ENABLE) {
190 if (tmp & I830_TSEG_SIZE_1M)
196 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
200 base = tom - tseg_size - ggtt->stolen_size;
206 /* make sure we don't clobber the GTT if it's within stolen memory */
207 if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
211 { .start = base, .end = base + ggtt->stolen_size, },
212 { .start = base, .end = base + ggtt->stolen_size, },
214 u64 ggtt_start, ggtt_end;
216 ggtt_start = I915_READ(PGTBL_CTL);
218 ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
219 (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
221 ggtt_start &= PGTBL_ADDRESS_LO_MASK;
222 ggtt_end = ggtt_start + ggtt_total_entries(ggtt) * 4;
224 if (ggtt_start >= stolen[0].start && ggtt_start < stolen[0].end)
225 stolen[0].end = ggtt_start;
226 if (ggtt_end > stolen[1].start && ggtt_end <= stolen[1].end)
227 stolen[1].start = ggtt_end;
229 /* pick the larger of the two chunks */
230 if (stolen[0].end - stolen[0].start >
231 stolen[1].end - stolen[1].start) {
232 base = stolen[0].start;
233 ggtt->stolen_size = stolen[0].end - stolen[0].start;
235 base = stolen[1].start;
236 ggtt->stolen_size = stolen[1].end - stolen[1].start;
239 if (stolen[0].start != stolen[1].start ||
240 stolen[0].end != stolen[1].end) {
241 DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
242 (unsigned long long)ggtt_start,
243 (unsigned long long)ggtt_end - 1);
244 DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
245 base, base + (u32)ggtt->stolen_size - 1);
250 /* Verify that nothing else uses this physical address. Stolen
251 * memory should be reserved by the BIOS and hidden from the
252 * kernel. So if the region is already marked as busy, something
253 * is seriously wrong.
255 r = devm_request_mem_region(dev->dev, base, ggtt->stolen_size,
256 "Graphics Stolen Memory");
259 * One more attempt but this time requesting region from
260 * base + 1, as we have seen that this resolves the region
261 * conflict with the PCI Bus.
262 * This is a BIOS w/a: Some BIOS wrap stolen in the root
263 * PCI bus, but have an off-by-one error. Hence retry the
264 * reservation starting from 1 instead of 0.
266 r = devm_request_mem_region(dev->dev, base + 1,
267 ggtt->stolen_size - 1,
268 "Graphics Stolen Memory");
270 * GEN3 firmware likes to smash pci bridges into the stolen
271 * range. Apparently this works.
273 if (r == NULL && !IS_GEN3(dev)) {
274 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
275 base, base + (uint32_t)ggtt->stolen_size);
283 void i915_gem_cleanup_stolen(struct drm_device *dev)
285 struct drm_i915_private *dev_priv = to_i915(dev);
287 if (!drm_mm_initialized(&dev_priv->mm.stolen))
290 drm_mm_takedown(&dev_priv->mm.stolen);
293 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
294 unsigned long *base, unsigned long *size)
296 struct i915_ggtt *ggtt = &dev_priv->ggtt;
297 uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
298 CTG_STOLEN_RESERVED :
299 ELK_STOLEN_RESERVED);
300 unsigned long stolen_top = dev_priv->mm.stolen_base +
303 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
305 WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
307 /* On these platforms, the register doesn't have a size field, so the
308 * size is the distance between the base and the top of the stolen
309 * memory. We also have the genuine case where base is zero and there's
310 * nothing reserved. */
314 *size = stolen_top - *base;
317 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
318 unsigned long *base, unsigned long *size)
320 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
322 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
324 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
325 case GEN6_STOLEN_RESERVED_1M:
328 case GEN6_STOLEN_RESERVED_512K:
331 case GEN6_STOLEN_RESERVED_256K:
334 case GEN6_STOLEN_RESERVED_128K:
339 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
343 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
344 unsigned long *base, unsigned long *size)
346 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
348 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
350 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
351 case GEN7_STOLEN_RESERVED_1M:
354 case GEN7_STOLEN_RESERVED_256K:
359 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
363 static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv,
364 unsigned long *base, unsigned long *size)
366 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
368 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
370 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
371 case GEN8_STOLEN_RESERVED_1M:
374 case GEN8_STOLEN_RESERVED_2M:
375 *size = 2 * 1024 * 1024;
377 case GEN8_STOLEN_RESERVED_4M:
378 *size = 4 * 1024 * 1024;
380 case GEN8_STOLEN_RESERVED_8M:
381 *size = 8 * 1024 * 1024;
384 *size = 8 * 1024 * 1024;
385 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
389 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
390 unsigned long *base, unsigned long *size)
392 struct i915_ggtt *ggtt = &dev_priv->ggtt;
393 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
394 unsigned long stolen_top;
396 stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
398 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
400 /* On these platforms, the register doesn't have a size field, so the
401 * size is the distance between the base and the top of the stolen
402 * memory. We also have the genuine case where base is zero and there's
403 * nothing reserved. */
407 *size = stolen_top - *base;
410 int i915_gem_init_stolen(struct drm_device *dev)
412 struct drm_i915_private *dev_priv = to_i915(dev);
413 struct i915_ggtt *ggtt = &dev_priv->ggtt;
414 unsigned long reserved_total, reserved_base = 0, reserved_size;
415 unsigned long stolen_top;
417 mutex_init(&dev_priv->mm.stolen_lock);
419 #ifdef CONFIG_INTEL_IOMMU
420 if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
421 DRM_INFO("DMAR active, disabling use of stolen memory\n");
426 if (ggtt->stolen_size == 0)
429 dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
430 if (dev_priv->mm.stolen_base == 0)
433 stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
435 switch (INTEL_INFO(dev_priv)->gen) {
441 g4x_get_stolen_reserved(dev_priv, &reserved_base,
445 /* Assume the gen6 maximum for the older platforms. */
446 reserved_size = 1024 * 1024;
447 reserved_base = stolen_top - reserved_size;
450 gen6_get_stolen_reserved(dev_priv, &reserved_base,
454 gen7_get_stolen_reserved(dev_priv, &reserved_base,
458 if (IS_BROADWELL(dev_priv) ||
459 IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev))
460 bdw_get_stolen_reserved(dev_priv, &reserved_base,
463 gen8_get_stolen_reserved(dev_priv, &reserved_base,
468 /* It is possible for the reserved base to be zero, but the register
469 * field for size doesn't have a zero option. */
470 if (reserved_base == 0) {
472 reserved_base = stolen_top;
475 if (reserved_base < dev_priv->mm.stolen_base ||
476 reserved_base + reserved_size > stolen_top) {
477 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
478 reserved_base, reserved_base + reserved_size,
479 dev_priv->mm.stolen_base, stolen_top);
483 ggtt->stolen_reserved_base = reserved_base;
484 ggtt->stolen_reserved_size = reserved_size;
486 /* It is possible for the reserved area to end before the end of stolen
487 * memory, so just consider the start. */
488 reserved_total = stolen_top - reserved_base;
490 DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
491 ggtt->stolen_size >> 10,
492 (ggtt->stolen_size - reserved_total) >> 10);
494 ggtt->stolen_usable_size = ggtt->stolen_size - reserved_total;
497 * Basic memrange allocator for stolen space.
499 * TODO: Notice that some platforms require us to not use the first page
500 * of the stolen memory but their BIOSes may still put the framebuffer
501 * on the first page. So we don't reserve this page for now because of
502 * that. Our current solution is to just prevent new nodes from being
503 * inserted on the first page - see the check we have at
504 * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
507 drm_mm_init(&dev_priv->mm.stolen, 0, ggtt->stolen_usable_size);
512 static struct sg_table *
513 i915_pages_create_for_stolen(struct drm_device *dev,
514 u32 offset, u32 size)
516 struct drm_i915_private *dev_priv = to_i915(dev);
517 struct i915_ggtt *ggtt = &dev_priv->ggtt;
519 struct scatterlist *sg;
521 DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
522 BUG_ON(offset > ggtt->stolen_size - size);
524 /* We hide that we have no struct page backing our stolen object
525 * by wrapping the contiguous physical allocation with a fake
526 * dma mapping in a single scatterlist.
529 st = kmalloc(sizeof(*st), GFP_KERNEL);
533 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
542 sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
543 sg_dma_len(sg) = size;
548 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
554 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
556 /* Should only be called during free */
557 sg_free_table(obj->pages);
563 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
565 struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
568 i915_gem_stolen_remove_node(dev_priv, obj->stolen);
573 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
574 .get_pages = i915_gem_object_get_pages_stolen,
575 .put_pages = i915_gem_object_put_pages_stolen,
576 .release = i915_gem_object_release_stolen,
579 static struct drm_i915_gem_object *
580 _i915_gem_object_create_stolen(struct drm_device *dev,
581 struct drm_mm_node *stolen)
583 struct drm_i915_gem_object *obj;
585 obj = i915_gem_object_alloc(dev);
589 drm_gem_private_object_init(dev, &obj->base, stolen->size);
590 i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
592 obj->pages = i915_pages_create_for_stolen(dev,
593 stolen->start, stolen->size);
594 if (obj->pages == NULL)
597 obj->get_page.sg = obj->pages->sgl;
598 obj->get_page.last = 0;
600 i915_gem_object_pin_pages(obj);
601 obj->stolen = stolen;
603 obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
604 obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
609 i915_gem_object_free(obj);
613 struct drm_i915_gem_object *
614 i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
616 struct drm_i915_private *dev_priv = to_i915(dev);
617 struct drm_i915_gem_object *obj;
618 struct drm_mm_node *stolen;
621 if (!drm_mm_initialized(&dev_priv->mm.stolen))
624 DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
628 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
632 ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
638 obj = _i915_gem_object_create_stolen(dev, stolen);
642 i915_gem_stolen_remove_node(dev_priv, stolen);
647 struct drm_i915_gem_object *
648 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
653 struct drm_i915_private *dev_priv = to_i915(dev);
654 struct i915_ggtt *ggtt = &dev_priv->ggtt;
655 struct drm_i915_gem_object *obj;
656 struct drm_mm_node *stolen;
657 struct i915_vma *vma;
660 if (!drm_mm_initialized(&dev_priv->mm.stolen))
663 lockdep_assert_held(&dev->struct_mutex);
665 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
666 stolen_offset, gtt_offset, size);
668 /* KISS and expect everything to be page-aligned */
669 if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
670 WARN_ON(stolen_offset & 4095))
673 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
677 stolen->start = stolen_offset;
679 mutex_lock(&dev_priv->mm.stolen_lock);
680 ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
681 mutex_unlock(&dev_priv->mm.stolen_lock);
683 DRM_DEBUG_KMS("failed to allocate stolen space\n");
688 obj = _i915_gem_object_create_stolen(dev, stolen);
690 DRM_DEBUG_KMS("failed to allocate stolen object\n");
691 i915_gem_stolen_remove_node(dev_priv, stolen);
696 /* Some objects just need physical mem from stolen space */
697 if (gtt_offset == I915_GTT_OFFSET_NONE)
700 vma = i915_gem_obj_lookup_or_create_vma(obj, &ggtt->base, NULL);
706 /* To simplify the initialisation sequence between KMS and GTT,
707 * we allow construction of the stolen object prior to
708 * setting up the GTT space. The actual reservation will occur
711 vma->node.start = gtt_offset;
712 vma->node.size = size;
714 ret = drm_mm_reserve_node(&ggtt->base.mm, &vma->node);
716 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
720 vma->pages = obj->pages;
721 vma->flags |= I915_VMA_GLOBAL_BIND;
722 __i915_vma_set_map_and_fenceable(vma);
723 list_move_tail(&vma->vm_link, &ggtt->base.inactive_list);
726 list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
727 i915_gem_object_pin_pages(obj);
732 i915_gem_object_put(obj);