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 struct sg_table *
501 i915_pages_create_for_stolen(struct drm_device *dev,
502 resource_size_t offset, resource_size_t size)
504 struct drm_i915_private *i915 = to_i915(dev);
506 struct scatterlist *sg;
508 GEM_BUG_ON(range_overflows(offset, size, resource_size(&i915->dsm)));
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);
517 return ERR_PTR(-ENOMEM);
519 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
521 return ERR_PTR(-ENOMEM);
528 sg_dma_address(sg) = (dma_addr_t)i915->dsm.start + offset;
529 sg_dma_len(sg) = size;
534 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
536 struct sg_table *pages =
537 i915_pages_create_for_stolen(obj->base.dev,
541 return PTR_ERR(pages);
543 __i915_gem_object_set_pages(obj, pages, obj->stolen->size);
548 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
549 struct sg_table *pages)
551 /* Should only be called from i915_gem_object_release_stolen() */
552 sg_free_table(pages);
557 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
559 struct drm_i915_private *i915 = to_i915(obj->base.dev);
560 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
564 i915_gem_object_release_memory_region(obj);
566 i915_gem_stolen_remove_node(i915, stolen);
570 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
571 .name = "i915_gem_object_stolen",
572 .get_pages = i915_gem_object_get_pages_stolen,
573 .put_pages = i915_gem_object_put_pages_stolen,
574 .release = i915_gem_object_release_stolen,
577 static struct drm_i915_gem_object *
578 __i915_gem_object_create_stolen(struct intel_memory_region *mem,
579 struct drm_mm_node *stolen)
581 static struct lock_class_key lock_class;
582 struct drm_i915_gem_object *obj;
583 unsigned int cache_level;
586 obj = i915_gem_object_alloc();
590 drm_gem_private_object_init(&mem->i915->drm, &obj->base, stolen->size);
591 i915_gem_object_init(obj, &i915_gem_object_stolen_ops, &lock_class);
593 obj->stolen = stolen;
594 obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
595 cache_level = HAS_LLC(mem->i915) ? I915_CACHE_LLC : I915_CACHE_NONE;
596 i915_gem_object_set_cache_coherency(obj, cache_level);
598 err = i915_gem_object_pin_pages(obj);
602 i915_gem_object_init_memory_region(obj, mem, 0);
607 i915_gem_object_free(obj);
612 static struct drm_i915_gem_object *
613 _i915_gem_object_create_stolen(struct intel_memory_region *mem,
614 resource_size_t size,
617 struct drm_i915_private *i915 = mem->i915;
618 struct drm_i915_gem_object *obj;
619 struct drm_mm_node *stolen;
622 if (!drm_mm_initialized(&i915->mm.stolen))
623 return ERR_PTR(-ENODEV);
626 return ERR_PTR(-EINVAL);
628 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
630 return ERR_PTR(-ENOMEM);
632 ret = i915_gem_stolen_insert_node(i915, stolen, size, 4096);
638 obj = __i915_gem_object_create_stolen(mem, stolen);
645 i915_gem_stolen_remove_node(i915, stolen);
651 struct drm_i915_gem_object *
652 i915_gem_object_create_stolen(struct drm_i915_private *i915,
653 resource_size_t size)
655 return i915_gem_object_create_region(i915->mm.regions[INTEL_REGION_STOLEN],
656 size, I915_BO_ALLOC_CONTIGUOUS);
659 static int init_stolen(struct intel_memory_region *mem)
661 intel_memory_region_set_name(mem, "stolen");
664 * Initialise stolen early so that we may reserve preallocated
665 * objects for the BIOS to KMS transition.
667 return i915_gem_init_stolen(mem->i915);
670 static void release_stolen(struct intel_memory_region *mem)
672 i915_gem_cleanup_stolen(mem->i915);
675 static const struct intel_memory_region_ops i915_region_stolen_ops = {
677 .release = release_stolen,
678 .create_object = _i915_gem_object_create_stolen,
681 struct intel_memory_region *i915_gem_stolen_setup(struct drm_i915_private *i915)
683 return intel_memory_region_create(i915,
684 intel_graphics_stolen_res.start,
685 resource_size(&intel_graphics_stolen_res),
687 &i915_region_stolen_ops);
690 struct drm_i915_gem_object *
691 i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *i915,
692 resource_size_t stolen_offset,
693 resource_size_t size)
695 struct intel_memory_region *mem = i915->mm.regions[INTEL_REGION_STOLEN];
696 struct drm_i915_gem_object *obj;
697 struct drm_mm_node *stolen;
700 if (!drm_mm_initialized(&i915->mm.stolen))
701 return ERR_PTR(-ENODEV);
704 "creating preallocated stolen object: stolen_offset=%pa, size=%pa\n",
705 &stolen_offset, &size);
707 /* KISS and expect everything to be page-aligned */
708 if (GEM_WARN_ON(size == 0) ||
709 GEM_WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
710 GEM_WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
711 return ERR_PTR(-EINVAL);
713 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
715 return ERR_PTR(-ENOMEM);
717 stolen->start = stolen_offset;
719 mutex_lock(&i915->mm.stolen_lock);
720 ret = drm_mm_reserve_node(&i915->mm.stolen, stolen);
721 mutex_unlock(&i915->mm.stolen_lock);
727 obj = __i915_gem_object_create_stolen(mem, stolen);
731 i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
735 i915_gem_stolen_remove_node(i915, stolen);