2 * SPDX-License-Identifier: MIT
4 * Copyright © 2008-2012 Intel Corporation
7 #include <linux/errno.h>
8 #include <linux/mutex.h>
10 #include <drm/drm_mm.h>
11 #include <drm/i915_drm.h>
13 #include "gem/i915_gem_region.h"
15 #include "i915_gem_stolen.h"
16 #include "i915_vgpu.h"
19 * The BIOS typically reserves some of the system's memory for the exclusive
20 * use of the integrated graphics. This memory is no longer available for
21 * use by the OS and so the user finds that his system has less memory
22 * available than he put in. We refer to this memory as stolen.
24 * The BIOS will allocate its framebuffer from the stolen memory. Our
25 * goal is try to reuse that object for our own fbcon which must always
26 * be available for panics. Anything else we can reuse the stolen memory
30 int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *i915,
31 struct drm_mm_node *node, u64 size,
32 unsigned alignment, u64 start, u64 end)
36 if (!drm_mm_initialized(&i915->mm.stolen))
39 /* WaSkipStolenMemoryFirstPage:bdw+ */
40 if (INTEL_GEN(i915) >= 8 && start < 4096)
43 mutex_lock(&i915->mm.stolen_lock);
44 ret = drm_mm_insert_node_in_range(&i915->mm.stolen, node,
46 start, end, DRM_MM_INSERT_BEST);
47 mutex_unlock(&i915->mm.stolen_lock);
52 int i915_gem_stolen_insert_node(struct drm_i915_private *i915,
53 struct drm_mm_node *node, u64 size,
56 return i915_gem_stolen_insert_node_in_range(i915, node,
62 void i915_gem_stolen_remove_node(struct drm_i915_private *i915,
63 struct drm_mm_node *node)
65 mutex_lock(&i915->mm.stolen_lock);
66 drm_mm_remove_node(node);
67 mutex_unlock(&i915->mm.stolen_lock);
70 static int i915_adjust_stolen(struct drm_i915_private *i915,
73 struct i915_ggtt *ggtt = &i915->ggtt;
74 struct intel_uncore *uncore = ggtt->vm.gt->uncore;
77 if (dsm->start == 0 || dsm->end <= dsm->start)
81 * TODO: We have yet too encounter the case where the GTT wasn't at the
82 * end of stolen. With that assumption we could simplify this.
85 /* Make sure we don't clobber the GTT if it's within stolen memory */
86 if (INTEL_GEN(i915) <= 4 &&
87 !IS_G33(i915) && !IS_PINEVIEW(i915) && !IS_G4X(i915)) {
88 struct resource stolen[2] = {*dsm, *dsm};
89 struct resource ggtt_res;
90 resource_size_t ggtt_start;
92 ggtt_start = intel_uncore_read(uncore, PGTBL_CTL);
94 ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
95 (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
97 ggtt_start &= PGTBL_ADDRESS_LO_MASK;
100 (struct resource) DEFINE_RES_MEM(ggtt_start,
101 ggtt_total_entries(ggtt) * 4);
103 if (ggtt_res.start >= stolen[0].start && ggtt_res.start < stolen[0].end)
104 stolen[0].end = ggtt_res.start;
105 if (ggtt_res.end > stolen[1].start && ggtt_res.end <= stolen[1].end)
106 stolen[1].start = ggtt_res.end;
108 /* Pick the larger of the two chunks */
109 if (resource_size(&stolen[0]) > resource_size(&stolen[1]))
114 if (stolen[0].start != stolen[1].start ||
115 stolen[0].end != stolen[1].end) {
117 "GTT within stolen memory at %pR\n",
119 drm_dbg(&i915->drm, "Stolen memory adjusted to %pR\n",
125 * Verify that nothing else uses this physical address. Stolen
126 * memory should be reserved by the BIOS and hidden from the
127 * kernel. So if the region is already marked as busy, something
128 * is seriously wrong.
130 r = devm_request_mem_region(i915->drm.dev, dsm->start,
132 "Graphics Stolen Memory");
135 * One more attempt but this time requesting region from
136 * start + 1, as we have seen that this resolves the region
137 * conflict with the PCI Bus.
138 * This is a BIOS w/a: Some BIOS wrap stolen in the root
139 * PCI bus, but have an off-by-one error. Hence retry the
140 * reservation starting from 1 instead of 0.
141 * There's also BIOS with off-by-one on the other end.
143 r = devm_request_mem_region(i915->drm.dev, dsm->start + 1,
144 resource_size(dsm) - 2,
145 "Graphics Stolen Memory");
147 * GEN3 firmware likes to smash pci bridges into the stolen
148 * range. Apparently this works.
150 if (!r && !IS_GEN(i915, 3)) {
152 "conflict detected with stolen region: %pR\n",
162 static void i915_gem_cleanup_stolen(struct drm_i915_private *i915)
164 if (!drm_mm_initialized(&i915->mm.stolen))
167 drm_mm_takedown(&i915->mm.stolen);
170 static void g4x_get_stolen_reserved(struct drm_i915_private *i915,
171 struct intel_uncore *uncore,
172 resource_size_t *base,
173 resource_size_t *size)
175 u32 reg_val = intel_uncore_read(uncore,
177 CTG_STOLEN_RESERVED :
178 ELK_STOLEN_RESERVED);
179 resource_size_t stolen_top = i915->dsm.end + 1;
181 drm_dbg(&i915->drm, "%s_STOLEN_RESERVED = %08x\n",
182 IS_GM45(i915) ? "CTG" : "ELK", reg_val);
184 if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0)
188 * Whether ILK really reuses the ELK register for this is unclear.
189 * Let's see if we catch anyone with this supposedly enabled on ILK.
191 drm_WARN(&i915->drm, IS_GEN(i915, 5),
192 "ILK stolen reserved found? 0x%08x\n",
195 if (!(reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK))
198 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
199 drm_WARN_ON(&i915->drm,
200 (reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
202 *size = stolen_top - *base;
205 static void gen6_get_stolen_reserved(struct drm_i915_private *i915,
206 struct intel_uncore *uncore,
207 resource_size_t *base,
208 resource_size_t *size)
210 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
212 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
214 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
217 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
219 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
220 case GEN6_STOLEN_RESERVED_1M:
223 case GEN6_STOLEN_RESERVED_512K:
226 case GEN6_STOLEN_RESERVED_256K:
229 case GEN6_STOLEN_RESERVED_128K:
234 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
238 static void vlv_get_stolen_reserved(struct drm_i915_private *i915,
239 struct intel_uncore *uncore,
240 resource_size_t *base,
241 resource_size_t *size)
243 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
244 resource_size_t stolen_top = i915->dsm.end + 1;
246 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
248 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
251 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
253 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
255 case GEN7_STOLEN_RESERVED_1M:
261 * On vlv, the ADDR_MASK portion is left as 0 and HW deduces the
262 * reserved location as (top - size).
264 *base = stolen_top - *size;
267 static void gen7_get_stolen_reserved(struct drm_i915_private *i915,
268 struct intel_uncore *uncore,
269 resource_size_t *base,
270 resource_size_t *size)
272 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
274 drm_dbg(&i915->drm, "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 *i915,
295 struct intel_uncore *uncore,
296 resource_size_t *base,
297 resource_size_t *size)
299 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
301 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
303 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
306 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
308 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
309 case GEN8_STOLEN_RESERVED_1M:
312 case GEN8_STOLEN_RESERVED_2M:
313 *size = 2 * 1024 * 1024;
315 case GEN8_STOLEN_RESERVED_4M:
316 *size = 4 * 1024 * 1024;
318 case GEN8_STOLEN_RESERVED_8M:
319 *size = 8 * 1024 * 1024;
322 *size = 8 * 1024 * 1024;
323 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
327 static void bdw_get_stolen_reserved(struct drm_i915_private *i915,
328 struct intel_uncore *uncore,
329 resource_size_t *base,
330 resource_size_t *size)
332 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
333 resource_size_t stolen_top = i915->dsm.end + 1;
335 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
337 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
340 if (!(reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK))
343 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
344 *size = stolen_top - *base;
347 static void icl_get_stolen_reserved(struct drm_i915_private *i915,
348 struct intel_uncore *uncore,
349 resource_size_t *base,
350 resource_size_t *size)
352 u64 reg_val = intel_uncore_read64(uncore, GEN6_STOLEN_RESERVED);
354 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = 0x%016llx\n", reg_val);
356 *base = reg_val & GEN11_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 int i915_gem_init_stolen(struct drm_i915_private *i915)
379 struct intel_uncore *uncore = &i915->uncore;
380 resource_size_t reserved_base, stolen_top;
381 resource_size_t reserved_total, reserved_size;
383 mutex_init(&i915->mm.stolen_lock);
385 if (intel_vgpu_active(i915)) {
386 drm_notice(&i915->drm,
387 "%s, disabling use of stolen memory\n",
392 if (intel_vtd_active() && INTEL_GEN(i915) < 8) {
393 drm_notice(&i915->drm,
394 "%s, disabling use of stolen memory\n",
399 if (resource_size(&intel_graphics_stolen_res) == 0)
402 i915->dsm = intel_graphics_stolen_res;
404 if (i915_adjust_stolen(i915, &i915->dsm))
407 GEM_BUG_ON(i915->dsm.start == 0);
408 GEM_BUG_ON(i915->dsm.end <= i915->dsm.start);
410 stolen_top = i915->dsm.end + 1;
411 reserved_base = stolen_top;
414 switch (INTEL_GEN(i915)) {
423 g4x_get_stolen_reserved(i915, uncore,
424 &reserved_base, &reserved_size);
427 gen6_get_stolen_reserved(i915, uncore,
428 &reserved_base, &reserved_size);
431 if (IS_VALLEYVIEW(i915))
432 vlv_get_stolen_reserved(i915, uncore,
433 &reserved_base, &reserved_size);
435 gen7_get_stolen_reserved(i915, uncore,
436 &reserved_base, &reserved_size);
442 chv_get_stolen_reserved(i915, uncore,
443 &reserved_base, &reserved_size);
445 bdw_get_stolen_reserved(i915, uncore,
446 &reserved_base, &reserved_size);
449 MISSING_CASE(INTEL_GEN(i915));
453 icl_get_stolen_reserved(i915, uncore,
460 * Our expectation is that the reserved space is at the top of the
461 * stolen region and *never* at the bottom. If we see !reserved_base,
462 * it likely means we failed to read the registers correctly.
464 if (!reserved_base) {
466 "inconsistent reservation %pa + %pa; ignoring\n",
467 &reserved_base, &reserved_size);
468 reserved_base = stolen_top;
473 (struct resource)DEFINE_RES_MEM(reserved_base, reserved_size);
475 if (!resource_contains(&i915->dsm, &i915->dsm_reserved)) {
477 "Stolen reserved area %pR outside stolen memory %pR\n",
478 &i915->dsm_reserved, &i915->dsm);
482 /* It is possible for the reserved area to end before the end of stolen
483 * memory, so just consider the start. */
484 reserved_total = stolen_top - reserved_base;
487 "Memory reserved for graphics device: %lluK, usable: %lluK\n",
488 (u64)resource_size(&i915->dsm) >> 10,
489 ((u64)resource_size(&i915->dsm) - reserved_total) >> 10);
491 i915->stolen_usable_size =
492 resource_size(&i915->dsm) - reserved_total;
494 /* Basic memrange allocator for stolen space. */
495 drm_mm_init(&i915->mm.stolen, 0, i915->stolen_usable_size);
500 static void dbg_poison(struct i915_ggtt *ggtt,
501 dma_addr_t addr, resource_size_t size,
504 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
505 if (!drm_mm_node_allocated(&ggtt->error_capture))
508 if (ggtt->vm.bind_async_flags & I915_VMA_GLOBAL_BIND)
509 return; /* beware stop_machine() inversion */
511 GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE));
513 mutex_lock(&ggtt->error_mutex);
517 ggtt->vm.insert_page(&ggtt->vm, addr,
518 ggtt->error_capture.start,
522 s = io_mapping_map_wc(&ggtt->iomap,
523 ggtt->error_capture.start,
525 memset_io(s, x, PAGE_SIZE);
532 ggtt->vm.clear_range(&ggtt->vm, ggtt->error_capture.start, PAGE_SIZE);
533 mutex_unlock(&ggtt->error_mutex);
537 static struct sg_table *
538 i915_pages_create_for_stolen(struct drm_device *dev,
539 resource_size_t offset, resource_size_t size)
541 struct drm_i915_private *i915 = to_i915(dev);
543 struct scatterlist *sg;
545 GEM_BUG_ON(range_overflows(offset, size, resource_size(&i915->dsm)));
547 /* We hide that we have no struct page backing our stolen object
548 * by wrapping the contiguous physical allocation with a fake
549 * dma mapping in a single scatterlist.
552 st = kmalloc(sizeof(*st), GFP_KERNEL);
554 return ERR_PTR(-ENOMEM);
556 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
558 return ERR_PTR(-ENOMEM);
565 sg_dma_address(sg) = (dma_addr_t)i915->dsm.start + offset;
566 sg_dma_len(sg) = size;
571 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
573 struct sg_table *pages =
574 i915_pages_create_for_stolen(obj->base.dev,
578 return PTR_ERR(pages);
580 dbg_poison(&to_i915(obj->base.dev)->ggtt,
581 sg_dma_address(pages->sgl),
582 sg_dma_len(pages->sgl),
585 __i915_gem_object_set_pages(obj, pages, obj->stolen->size);
590 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
591 struct sg_table *pages)
593 /* Should only be called from i915_gem_object_release_stolen() */
595 dbg_poison(&to_i915(obj->base.dev)->ggtt,
596 sg_dma_address(pages->sgl),
597 sg_dma_len(pages->sgl),
600 sg_free_table(pages);
605 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
607 struct drm_i915_private *i915 = to_i915(obj->base.dev);
608 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
611 i915_gem_stolen_remove_node(i915, stolen);
614 i915_gem_object_release_memory_region(obj);
617 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
618 .name = "i915_gem_object_stolen",
619 .get_pages = i915_gem_object_get_pages_stolen,
620 .put_pages = i915_gem_object_put_pages_stolen,
621 .release = i915_gem_object_release_stolen,
624 static int __i915_gem_object_create_stolen(struct intel_memory_region *mem,
625 struct drm_i915_gem_object *obj,
626 struct drm_mm_node *stolen)
628 static struct lock_class_key lock_class;
629 unsigned int cache_level;
632 drm_gem_private_object_init(&mem->i915->drm, &obj->base, stolen->size);
633 i915_gem_object_init(obj, &i915_gem_object_stolen_ops, &lock_class);
635 obj->stolen = stolen;
636 obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
637 cache_level = HAS_LLC(mem->i915) ? I915_CACHE_LLC : I915_CACHE_NONE;
638 i915_gem_object_set_cache_coherency(obj, cache_level);
640 err = i915_gem_object_pin_pages(obj);
644 i915_gem_object_init_memory_region(obj, mem, 0);
649 static int _i915_gem_object_stolen_init(struct intel_memory_region *mem,
650 struct drm_i915_gem_object *obj,
651 resource_size_t size,
654 struct drm_i915_private *i915 = mem->i915;
655 struct drm_mm_node *stolen;
658 if (!drm_mm_initialized(&i915->mm.stolen))
664 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
668 ret = i915_gem_stolen_insert_node(i915, stolen, size, 4096);
672 ret = __i915_gem_object_create_stolen(mem, obj, stolen);
679 i915_gem_stolen_remove_node(i915, stolen);
685 struct drm_i915_gem_object *
686 i915_gem_object_create_stolen(struct drm_i915_private *i915,
687 resource_size_t size)
689 return i915_gem_object_create_region(i915->mm.regions[INTEL_REGION_STOLEN],
690 size, I915_BO_ALLOC_CONTIGUOUS);
693 static int init_stolen(struct intel_memory_region *mem)
695 intel_memory_region_set_name(mem, "stolen");
698 * Initialise stolen early so that we may reserve preallocated
699 * objects for the BIOS to KMS transition.
701 return i915_gem_init_stolen(mem->i915);
704 static void release_stolen(struct intel_memory_region *mem)
706 i915_gem_cleanup_stolen(mem->i915);
709 static const struct intel_memory_region_ops i915_region_stolen_ops = {
711 .release = release_stolen,
712 .init_object = _i915_gem_object_stolen_init,
715 struct intel_memory_region *i915_gem_stolen_setup(struct drm_i915_private *i915)
717 return intel_memory_region_create(i915,
718 intel_graphics_stolen_res.start,
719 resource_size(&intel_graphics_stolen_res),
721 &i915_region_stolen_ops);
724 struct drm_i915_gem_object *
725 i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *i915,
726 resource_size_t stolen_offset,
727 resource_size_t size)
729 struct intel_memory_region *mem = i915->mm.regions[INTEL_REGION_STOLEN];
730 struct drm_i915_gem_object *obj;
731 struct drm_mm_node *stolen;
734 if (!drm_mm_initialized(&i915->mm.stolen))
735 return ERR_PTR(-ENODEV);
738 "creating preallocated stolen object: stolen_offset=%pa, size=%pa\n",
739 &stolen_offset, &size);
741 /* KISS and expect everything to be page-aligned */
742 if (GEM_WARN_ON(size == 0) ||
743 GEM_WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
744 GEM_WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
745 return ERR_PTR(-EINVAL);
747 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
749 return ERR_PTR(-ENOMEM);
751 stolen->start = stolen_offset;
753 mutex_lock(&i915->mm.stolen_lock);
754 ret = drm_mm_reserve_node(&i915->mm.stolen, stolen);
755 mutex_unlock(&i915->mm.stolen_lock);
759 obj = i915_gem_object_alloc();
765 ret = __i915_gem_object_create_stolen(mem, obj, stolen);
767 goto err_object_free;
769 i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
773 i915_gem_object_free(obj);
775 i915_gem_stolen_remove_node(i915, stolen);
781 bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj)
783 return obj->ops == &i915_gem_object_stolen_ops;