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 return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
77 dev_priv->gtt.stolen_usable_size);
80 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
81 struct drm_mm_node *node)
83 mutex_lock(&dev_priv->mm.stolen_lock);
84 drm_mm_remove_node(node);
85 mutex_unlock(&dev_priv->mm.stolen_lock);
88 static unsigned long i915_stolen_to_physical(struct drm_device *dev)
90 struct drm_i915_private *dev_priv = dev->dev_private;
94 /* Almost universally we can find the Graphics Base of Stolen Memory
95 * at offset 0x5c in the igfx configuration space. On a few (desktop)
96 * machines this is also mirrored in the bridge device at different
97 * locations, or in the MCHBAR.
99 * On 865 we just check the TOUD register.
101 * On 830/845/85x the stolen memory base isn't available in any
102 * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
106 if (INTEL_INFO(dev)->gen >= 3) {
107 /* Read Graphics Base of Stolen Memory directly */
108 pci_read_config_dword(dev->pdev, 0x5c, &base);
109 base &= ~((1<<20) - 1);
110 } else if (IS_I865G(dev)) {
114 * FIXME is the graphics stolen memory region
115 * always at TOUD? Ie. is it always the last
116 * one to be allocated by the BIOS?
118 pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0),
122 } else if (IS_I85X(dev)) {
127 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
130 if (tmp & TSEG_ENABLE)
133 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 1),
137 base = tom - tseg_size - dev_priv->gtt.stolen_size;
138 } else if (IS_845G(dev)) {
143 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
146 if (tmp & TSEG_ENABLE) {
147 switch (tmp & I845_TSEG_SIZE_MASK) {
148 case I845_TSEG_SIZE_512K:
151 case I845_TSEG_SIZE_1M:
157 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
161 base = tom - tseg_size - dev_priv->gtt.stolen_size;
162 } else if (IS_I830(dev)) {
167 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
170 if (tmp & TSEG_ENABLE) {
171 if (tmp & I830_TSEG_SIZE_1M)
177 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
181 base = tom - tseg_size - dev_priv->gtt.stolen_size;
187 /* make sure we don't clobber the GTT if it's within stolen memory */
188 if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
192 { .start = base, .end = base + dev_priv->gtt.stolen_size, },
193 { .start = base, .end = base + dev_priv->gtt.stolen_size, },
195 u64 gtt_start, gtt_end;
197 gtt_start = I915_READ(PGTBL_CTL);
199 gtt_start = (gtt_start & PGTBL_ADDRESS_LO_MASK) |
200 (gtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
202 gtt_start &= PGTBL_ADDRESS_LO_MASK;
203 gtt_end = gtt_start + gtt_total_entries(dev_priv->gtt) * 4;
205 if (gtt_start >= stolen[0].start && gtt_start < stolen[0].end)
206 stolen[0].end = gtt_start;
207 if (gtt_end > stolen[1].start && gtt_end <= stolen[1].end)
208 stolen[1].start = gtt_end;
210 /* pick the larger of the two chunks */
211 if (stolen[0].end - stolen[0].start >
212 stolen[1].end - stolen[1].start) {
213 base = stolen[0].start;
214 dev_priv->gtt.stolen_size = stolen[0].end - stolen[0].start;
216 base = stolen[1].start;
217 dev_priv->gtt.stolen_size = stolen[1].end - stolen[1].start;
220 if (stolen[0].start != stolen[1].start ||
221 stolen[0].end != stolen[1].end) {
222 DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
223 (unsigned long long) gtt_start,
224 (unsigned long long) gtt_end - 1);
225 DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
226 base, base + (u32) dev_priv->gtt.stolen_size - 1);
231 /* Verify that nothing else uses this physical address. Stolen
232 * memory should be reserved by the BIOS and hidden from the
233 * kernel. So if the region is already marked as busy, something
234 * is seriously wrong.
236 r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size,
237 "Graphics Stolen Memory");
240 * One more attempt but this time requesting region from
241 * base + 1, as we have seen that this resolves the region
242 * conflict with the PCI Bus.
243 * This is a BIOS w/a: Some BIOS wrap stolen in the root
244 * PCI bus, but have an off-by-one error. Hence retry the
245 * reservation starting from 1 instead of 0.
247 r = devm_request_mem_region(dev->dev, base + 1,
248 dev_priv->gtt.stolen_size - 1,
249 "Graphics Stolen Memory");
251 * GEN3 firmware likes to smash pci bridges into the stolen
252 * range. Apparently this works.
254 if (r == NULL && !IS_GEN3(dev)) {
255 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
256 base, base + (uint32_t)dev_priv->gtt.stolen_size);
264 void i915_gem_cleanup_stolen(struct drm_device *dev)
266 struct drm_i915_private *dev_priv = dev->dev_private;
268 if (!drm_mm_initialized(&dev_priv->mm.stolen))
271 drm_mm_takedown(&dev_priv->mm.stolen);
274 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
275 unsigned long *base, unsigned long *size)
277 uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
278 CTG_STOLEN_RESERVED :
279 ELK_STOLEN_RESERVED);
280 unsigned long stolen_top = dev_priv->mm.stolen_base +
281 dev_priv->gtt.stolen_size;
283 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
285 WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
287 /* On these platforms, the register doesn't have a size field, so the
288 * size is the distance between the base and the top of the stolen
289 * memory. We also have the genuine case where base is zero and there's
290 * nothing reserved. */
294 *size = stolen_top - *base;
297 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
298 unsigned long *base, unsigned long *size)
300 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
302 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
304 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
305 case GEN6_STOLEN_RESERVED_1M:
308 case GEN6_STOLEN_RESERVED_512K:
311 case GEN6_STOLEN_RESERVED_256K:
314 case GEN6_STOLEN_RESERVED_128K:
319 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
323 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
324 unsigned long *base, unsigned long *size)
326 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
328 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
330 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
331 case GEN7_STOLEN_RESERVED_1M:
334 case GEN7_STOLEN_RESERVED_256K:
339 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
343 static void gen8_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 & GEN6_STOLEN_RESERVED_ADDR_MASK;
350 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
351 case GEN8_STOLEN_RESERVED_1M:
354 case GEN8_STOLEN_RESERVED_2M:
355 *size = 2 * 1024 * 1024;
357 case GEN8_STOLEN_RESERVED_4M:
358 *size = 4 * 1024 * 1024;
360 case GEN8_STOLEN_RESERVED_8M:
361 *size = 8 * 1024 * 1024;
364 *size = 8 * 1024 * 1024;
365 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
369 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
370 unsigned long *base, unsigned long *size)
372 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
373 unsigned long stolen_top;
375 stolen_top = dev_priv->mm.stolen_base + dev_priv->gtt.stolen_size;
377 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
379 /* On these platforms, the register doesn't have a size field, so the
380 * size is the distance between the base and the top of the stolen
381 * memory. We also have the genuine case where base is zero and there's
382 * nothing reserved. */
386 *size = stolen_top - *base;
389 int i915_gem_init_stolen(struct drm_device *dev)
391 struct drm_i915_private *dev_priv = dev->dev_private;
392 unsigned long reserved_total, reserved_base = 0, reserved_size;
393 unsigned long stolen_top;
395 mutex_init(&dev_priv->mm.stolen_lock);
397 #ifdef CONFIG_INTEL_IOMMU
398 if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
399 DRM_INFO("DMAR active, disabling use of stolen memory\n");
404 if (dev_priv->gtt.stolen_size == 0)
407 dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
408 if (dev_priv->mm.stolen_base == 0)
411 stolen_top = dev_priv->mm.stolen_base + dev_priv->gtt.stolen_size;
413 switch (INTEL_INFO(dev_priv)->gen) {
419 g4x_get_stolen_reserved(dev_priv, &reserved_base,
423 /* Assume the gen6 maximum for the older platforms. */
424 reserved_size = 1024 * 1024;
425 reserved_base = stolen_top - reserved_size;
428 gen6_get_stolen_reserved(dev_priv, &reserved_base,
432 gen7_get_stolen_reserved(dev_priv, &reserved_base,
436 if (IS_BROADWELL(dev_priv) ||
437 IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev))
438 bdw_get_stolen_reserved(dev_priv, &reserved_base,
441 gen8_get_stolen_reserved(dev_priv, &reserved_base,
446 /* It is possible for the reserved base to be zero, but the register
447 * field for size doesn't have a zero option. */
448 if (reserved_base == 0) {
450 reserved_base = stolen_top;
453 if (reserved_base < dev_priv->mm.stolen_base ||
454 reserved_base + reserved_size > stolen_top) {
455 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
456 reserved_base, reserved_base + reserved_size,
457 dev_priv->mm.stolen_base, stolen_top);
461 /* It is possible for the reserved area to end before the end of stolen
462 * memory, so just consider the start. */
463 reserved_total = stolen_top - reserved_base;
465 DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
466 dev_priv->gtt.stolen_size >> 10,
467 (dev_priv->gtt.stolen_size - reserved_total) >> 10);
469 dev_priv->gtt.stolen_usable_size = dev_priv->gtt.stolen_size -
473 * Basic memrange allocator for stolen space.
475 * TODO: Notice that some platforms require us to not use the first page
476 * of the stolen memory but their BIOSes may still put the framebuffer
477 * on the first page. So we don't reserve this page for now because of
478 * that. Our current solution is to just prevent new nodes from being
479 * inserted on the first page - see the check we have at
480 * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
483 drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_usable_size);
488 static struct sg_table *
489 i915_pages_create_for_stolen(struct drm_device *dev,
490 u32 offset, u32 size)
492 struct drm_i915_private *dev_priv = dev->dev_private;
494 struct scatterlist *sg;
496 DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
497 BUG_ON(offset > dev_priv->gtt.stolen_size - size);
499 /* We hide that we have no struct page backing our stolen object
500 * by wrapping the contiguous physical allocation with a fake
501 * dma mapping in a single scatterlist.
504 st = kmalloc(sizeof(*st), GFP_KERNEL);
508 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
517 sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
518 sg_dma_len(sg) = size;
523 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
529 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
531 /* Should only be called during free */
532 sg_free_table(obj->pages);
538 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
540 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
543 i915_gem_stolen_remove_node(dev_priv, obj->stolen);
548 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
549 .get_pages = i915_gem_object_get_pages_stolen,
550 .put_pages = i915_gem_object_put_pages_stolen,
551 .release = i915_gem_object_release_stolen,
554 static struct drm_i915_gem_object *
555 _i915_gem_object_create_stolen(struct drm_device *dev,
556 struct drm_mm_node *stolen)
558 struct drm_i915_gem_object *obj;
560 obj = i915_gem_object_alloc(dev);
564 drm_gem_private_object_init(dev, &obj->base, stolen->size);
565 i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
567 obj->pages = i915_pages_create_for_stolen(dev,
568 stolen->start, stolen->size);
569 if (obj->pages == NULL)
572 i915_gem_object_pin_pages(obj);
573 obj->stolen = stolen;
575 obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
576 obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
581 i915_gem_object_free(obj);
585 struct drm_i915_gem_object *
586 i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
588 struct drm_i915_private *dev_priv = dev->dev_private;
589 struct drm_i915_gem_object *obj;
590 struct drm_mm_node *stolen;
593 if (!drm_mm_initialized(&dev_priv->mm.stolen))
596 DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
600 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
604 ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
610 obj = _i915_gem_object_create_stolen(dev, stolen);
614 i915_gem_stolen_remove_node(dev_priv, stolen);
619 struct drm_i915_gem_object *
620 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
625 struct drm_i915_private *dev_priv = dev->dev_private;
626 struct i915_address_space *ggtt = &dev_priv->gtt.base;
627 struct drm_i915_gem_object *obj;
628 struct drm_mm_node *stolen;
629 struct i915_vma *vma;
632 if (!drm_mm_initialized(&dev_priv->mm.stolen))
635 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
636 stolen_offset, gtt_offset, size);
638 /* KISS and expect everything to be page-aligned */
639 if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
640 WARN_ON(stolen_offset & 4095))
643 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
647 stolen->start = stolen_offset;
649 mutex_lock(&dev_priv->mm.stolen_lock);
650 ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
651 mutex_unlock(&dev_priv->mm.stolen_lock);
653 DRM_DEBUG_KMS("failed to allocate stolen space\n");
658 obj = _i915_gem_object_create_stolen(dev, stolen);
660 DRM_DEBUG_KMS("failed to allocate stolen object\n");
661 i915_gem_stolen_remove_node(dev_priv, stolen);
666 /* Some objects just need physical mem from stolen space */
667 if (gtt_offset == I915_GTT_OFFSET_NONE)
670 vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt);
676 /* To simplify the initialisation sequence between KMS and GTT,
677 * we allow construction of the stolen object prior to
678 * setting up the GTT space. The actual reservation will occur
681 vma->node.start = gtt_offset;
682 vma->node.size = size;
683 if (drm_mm_initialized(&ggtt->mm)) {
684 ret = drm_mm_reserve_node(&ggtt->mm, &vma->node);
686 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
690 vma->bound |= GLOBAL_BIND;
691 __i915_vma_set_map_and_fenceable(vma);
692 list_add_tail(&vma->mm_list, &ggtt->inactive_list);
695 list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
696 i915_gem_object_pin_pages(obj);
701 drm_gem_object_unreference(&obj->base);