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+ (incomplete)
60 if (start
< 4096 && INTEL_GEN(dev_priv
) >= 8)
63 mutex_lock(&dev_priv
->mm
.stolen_lock
);
64 ret
= drm_mm_insert_node_in_range(&dev_priv
->mm
.stolen
, node
, size
,
65 alignment
, start
, end
,
66 DRM_MM_SEARCH_DEFAULT
);
67 mutex_unlock(&dev_priv
->mm
.stolen_lock
);
72 int i915_gem_stolen_insert_node(struct drm_i915_private
*dev_priv
,
73 struct drm_mm_node
*node
, u64 size
,
76 struct i915_ggtt
*ggtt
= &dev_priv
->ggtt
;
78 return i915_gem_stolen_insert_node_in_range(dev_priv
, node
, size
,
80 ggtt
->stolen_usable_size
);
83 void i915_gem_stolen_remove_node(struct drm_i915_private
*dev_priv
,
84 struct drm_mm_node
*node
)
86 mutex_lock(&dev_priv
->mm
.stolen_lock
);
87 drm_mm_remove_node(node
);
88 mutex_unlock(&dev_priv
->mm
.stolen_lock
);
91 static unsigned long i915_stolen_to_physical(struct drm_i915_private
*dev_priv
)
93 struct pci_dev
*pdev
= dev_priv
->drm
.pdev
;
94 struct i915_ggtt
*ggtt
= &dev_priv
->ggtt
;
98 /* Almost universally we can find the Graphics Base of Stolen Memory
99 * at register BSM (0x5c) in the igfx configuration space. On a few
100 * (desktop) machines this is also mirrored in the bridge device at
101 * different locations, or in the MCHBAR.
103 * On 865 we just check the TOUD register.
105 * On 830/845/85x the stolen memory base isn't available in any
106 * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
110 if (INTEL_GEN(dev_priv
) >= 3) {
113 pci_read_config_dword(pdev
, INTEL_BSM
, &bsm
);
115 base
= bsm
& INTEL_BSM_MASK
;
116 } else if (IS_I865G(dev_priv
)) {
121 pci_bus_read_config_byte(pdev
->bus
, PCI_DEVFN(0, 0),
124 if (tmp
& TSEG_ENABLE
) {
125 switch (tmp
& I845_TSEG_SIZE_MASK
) {
126 case I845_TSEG_SIZE_512K
:
129 case I845_TSEG_SIZE_1M
:
135 pci_bus_read_config_word(pdev
->bus
, PCI_DEVFN(0, 0),
138 base
= (toud
<< 16) + tseg_size
;
139 } else if (IS_I85X(dev_priv
)) {
144 pci_bus_read_config_byte(pdev
->bus
, PCI_DEVFN(0, 0),
147 if (tmp
& TSEG_ENABLE
)
150 pci_bus_read_config_byte(pdev
->bus
, PCI_DEVFN(0, 1),
154 base
= tom
- tseg_size
- ggtt
->stolen_size
;
155 } else if (IS_845G(dev_priv
)) {
160 pci_bus_read_config_byte(pdev
->bus
, PCI_DEVFN(0, 0),
163 if (tmp
& TSEG_ENABLE
) {
164 switch (tmp
& I845_TSEG_SIZE_MASK
) {
165 case I845_TSEG_SIZE_512K
:
168 case I845_TSEG_SIZE_1M
:
174 pci_bus_read_config_byte(pdev
->bus
, PCI_DEVFN(0, 0),
178 base
= tom
- tseg_size
- ggtt
->stolen_size
;
179 } else if (IS_I830(dev_priv
)) {
184 pci_bus_read_config_byte(pdev
->bus
, PCI_DEVFN(0, 0),
187 if (tmp
& TSEG_ENABLE
) {
188 if (tmp
& I830_TSEG_SIZE_1M
)
194 pci_bus_read_config_byte(pdev
->bus
, PCI_DEVFN(0, 0),
198 base
= tom
- tseg_size
- ggtt
->stolen_size
;
204 /* make sure we don't clobber the GTT if it's within stolen memory */
205 if (INTEL_GEN(dev_priv
) <= 4 && !IS_G33(dev_priv
) &&
210 { .start
= base
, .end
= base
+ ggtt
->stolen_size
, },
211 { .start
= base
, .end
= base
+ ggtt
->stolen_size
, },
213 u64 ggtt_start
, ggtt_end
;
215 ggtt_start
= I915_READ(PGTBL_CTL
);
216 if (IS_GEN4(dev_priv
))
217 ggtt_start
= (ggtt_start
& PGTBL_ADDRESS_LO_MASK
) |
218 (ggtt_start
& PGTBL_ADDRESS_HI_MASK
) << 28;
220 ggtt_start
&= PGTBL_ADDRESS_LO_MASK
;
221 ggtt_end
= ggtt_start
+ ggtt_total_entries(ggtt
) * 4;
223 if (ggtt_start
>= stolen
[0].start
&& ggtt_start
< stolen
[0].end
)
224 stolen
[0].end
= ggtt_start
;
225 if (ggtt_end
> stolen
[1].start
&& ggtt_end
<= stolen
[1].end
)
226 stolen
[1].start
= ggtt_end
;
228 /* pick the larger of the two chunks */
229 if (stolen
[0].end
- stolen
[0].start
>
230 stolen
[1].end
- stolen
[1].start
) {
231 base
= stolen
[0].start
;
232 ggtt
->stolen_size
= stolen
[0].end
- stolen
[0].start
;
234 base
= stolen
[1].start
;
235 ggtt
->stolen_size
= stolen
[1].end
- stolen
[1].start
;
238 if (stolen
[0].start
!= stolen
[1].start
||
239 stolen
[0].end
!= stolen
[1].end
) {
240 DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
241 (unsigned long long)ggtt_start
,
242 (unsigned long long)ggtt_end
- 1);
243 DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
244 base
, base
+ (u32
)ggtt
->stolen_size
- 1);
249 /* Verify that nothing else uses this physical address. Stolen
250 * memory should be reserved by the BIOS and hidden from the
251 * kernel. So if the region is already marked as busy, something
252 * is seriously wrong.
254 r
= devm_request_mem_region(dev_priv
->drm
.dev
, base
, ggtt
->stolen_size
,
255 "Graphics Stolen Memory");
258 * One more attempt but this time requesting region from
259 * base + 1, as we have seen that this resolves the region
260 * conflict with the PCI Bus.
261 * This is a BIOS w/a: Some BIOS wrap stolen in the root
262 * PCI bus, but have an off-by-one error. Hence retry the
263 * reservation starting from 1 instead of 0.
265 r
= devm_request_mem_region(dev_priv
->drm
.dev
, base
+ 1,
266 ggtt
->stolen_size
- 1,
267 "Graphics Stolen Memory");
269 * GEN3 firmware likes to smash pci bridges into the stolen
270 * range. Apparently this works.
272 if (r
== NULL
&& !IS_GEN3(dev_priv
)) {
273 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
274 base
, base
+ (uint32_t)ggtt
->stolen_size
);
282 void i915_gem_cleanup_stolen(struct drm_device
*dev
)
284 struct drm_i915_private
*dev_priv
= to_i915(dev
);
286 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
289 drm_mm_takedown(&dev_priv
->mm
.stolen
);
292 static void g4x_get_stolen_reserved(struct drm_i915_private
*dev_priv
,
293 unsigned long *base
, unsigned long *size
)
295 struct i915_ggtt
*ggtt
= &dev_priv
->ggtt
;
296 uint32_t reg_val
= I915_READ(IS_GM45(dev_priv
) ?
297 CTG_STOLEN_RESERVED
:
298 ELK_STOLEN_RESERVED
);
299 unsigned long stolen_top
= dev_priv
->mm
.stolen_base
+
302 *base
= (reg_val
& G4X_STOLEN_RESERVED_ADDR2_MASK
) << 16;
304 WARN_ON((reg_val
& G4X_STOLEN_RESERVED_ADDR1_MASK
) < *base
);
306 /* On these platforms, the register doesn't have a size field, so the
307 * size is the distance between the base and the top of the stolen
308 * memory. We also have the genuine case where base is zero and there's
309 * nothing reserved. */
313 *size
= stolen_top
- *base
;
316 static void gen6_get_stolen_reserved(struct drm_i915_private
*dev_priv
,
317 unsigned long *base
, unsigned long *size
)
319 uint32_t reg_val
= I915_READ(GEN6_STOLEN_RESERVED
);
321 *base
= reg_val
& GEN6_STOLEN_RESERVED_ADDR_MASK
;
323 switch (reg_val
& GEN6_STOLEN_RESERVED_SIZE_MASK
) {
324 case GEN6_STOLEN_RESERVED_1M
:
327 case GEN6_STOLEN_RESERVED_512K
:
330 case GEN6_STOLEN_RESERVED_256K
:
333 case GEN6_STOLEN_RESERVED_128K
:
338 MISSING_CASE(reg_val
& GEN6_STOLEN_RESERVED_SIZE_MASK
);
342 static void gen7_get_stolen_reserved(struct drm_i915_private
*dev_priv
,
343 unsigned long *base
, unsigned long *size
)
345 uint32_t reg_val
= I915_READ(GEN6_STOLEN_RESERVED
);
347 *base
= reg_val
& GEN7_STOLEN_RESERVED_ADDR_MASK
;
349 switch (reg_val
& GEN7_STOLEN_RESERVED_SIZE_MASK
) {
350 case GEN7_STOLEN_RESERVED_1M
:
353 case GEN7_STOLEN_RESERVED_256K
:
358 MISSING_CASE(reg_val
& GEN7_STOLEN_RESERVED_SIZE_MASK
);
362 static void gen8_get_stolen_reserved(struct drm_i915_private
*dev_priv
,
363 unsigned long *base
, unsigned long *size
)
365 uint32_t reg_val
= I915_READ(GEN6_STOLEN_RESERVED
);
367 *base
= reg_val
& GEN6_STOLEN_RESERVED_ADDR_MASK
;
369 switch (reg_val
& GEN8_STOLEN_RESERVED_SIZE_MASK
) {
370 case GEN8_STOLEN_RESERVED_1M
:
373 case GEN8_STOLEN_RESERVED_2M
:
374 *size
= 2 * 1024 * 1024;
376 case GEN8_STOLEN_RESERVED_4M
:
377 *size
= 4 * 1024 * 1024;
379 case GEN8_STOLEN_RESERVED_8M
:
380 *size
= 8 * 1024 * 1024;
383 *size
= 8 * 1024 * 1024;
384 MISSING_CASE(reg_val
& GEN8_STOLEN_RESERVED_SIZE_MASK
);
388 static void bdw_get_stolen_reserved(struct drm_i915_private
*dev_priv
,
389 unsigned long *base
, unsigned long *size
)
391 struct i915_ggtt
*ggtt
= &dev_priv
->ggtt
;
392 uint32_t reg_val
= I915_READ(GEN6_STOLEN_RESERVED
);
393 unsigned long stolen_top
;
395 stolen_top
= dev_priv
->mm
.stolen_base
+ ggtt
->stolen_size
;
397 *base
= reg_val
& GEN6_STOLEN_RESERVED_ADDR_MASK
;
399 /* On these platforms, the register doesn't have a size field, so the
400 * size is the distance between the base and the top of the stolen
401 * memory. We also have the genuine case where base is zero and there's
402 * nothing reserved. */
406 *size
= stolen_top
- *base
;
409 int i915_gem_init_stolen(struct drm_i915_private
*dev_priv
)
411 struct i915_ggtt
*ggtt
= &dev_priv
->ggtt
;
412 unsigned long reserved_total
, reserved_base
= 0, reserved_size
;
413 unsigned long stolen_top
;
415 mutex_init(&dev_priv
->mm
.stolen_lock
);
417 if (intel_vgpu_active(dev_priv
)) {
418 DRM_INFO("iGVT-g active, disabling use of stolen memory\n");
422 #ifdef CONFIG_INTEL_IOMMU
423 if (intel_iommu_gfx_mapped
&& INTEL_GEN(dev_priv
) < 8) {
424 DRM_INFO("DMAR active, disabling use of stolen memory\n");
429 if (ggtt
->stolen_size
== 0)
432 dev_priv
->mm
.stolen_base
= i915_stolen_to_physical(dev_priv
);
433 if (dev_priv
->mm
.stolen_base
== 0)
436 stolen_top
= dev_priv
->mm
.stolen_base
+ ggtt
->stolen_size
;
438 switch (INTEL_INFO(dev_priv
)->gen
) {
443 if (IS_G4X(dev_priv
))
444 g4x_get_stolen_reserved(dev_priv
, &reserved_base
,
448 /* Assume the gen6 maximum for the older platforms. */
449 reserved_size
= 1024 * 1024;
450 reserved_base
= stolen_top
- reserved_size
;
453 gen6_get_stolen_reserved(dev_priv
, &reserved_base
,
457 gen7_get_stolen_reserved(dev_priv
, &reserved_base
,
461 if (IS_BROADWELL(dev_priv
) ||
462 IS_SKYLAKE(dev_priv
) || IS_KABYLAKE(dev_priv
))
463 bdw_get_stolen_reserved(dev_priv
, &reserved_base
,
466 gen8_get_stolen_reserved(dev_priv
, &reserved_base
,
471 /* It is possible for the reserved base to be zero, but the register
472 * field for size doesn't have a zero option. */
473 if (reserved_base
== 0) {
475 reserved_base
= stolen_top
;
478 if (reserved_base
< dev_priv
->mm
.stolen_base
||
479 reserved_base
+ reserved_size
> stolen_top
) {
480 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
481 reserved_base
, reserved_base
+ reserved_size
,
482 dev_priv
->mm
.stolen_base
, stolen_top
);
486 ggtt
->stolen_reserved_base
= reserved_base
;
487 ggtt
->stolen_reserved_size
= reserved_size
;
489 /* It is possible for the reserved area to end before the end of stolen
490 * memory, so just consider the start. */
491 reserved_total
= stolen_top
- reserved_base
;
493 DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
494 ggtt
->stolen_size
>> 10,
495 (ggtt
->stolen_size
- reserved_total
) >> 10);
497 ggtt
->stolen_usable_size
= ggtt
->stolen_size
- reserved_total
;
500 * Basic memrange allocator for stolen space.
502 * TODO: Notice that some platforms require us to not use the first page
503 * of the stolen memory but their BIOSes may still put the framebuffer
504 * on the first page. So we don't reserve this page for now because of
505 * that. Our current solution is to just prevent new nodes from being
506 * inserted on the first page - see the check we have at
507 * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
510 drm_mm_init(&dev_priv
->mm
.stolen
, 0, ggtt
->stolen_usable_size
);
515 static struct sg_table
*
516 i915_pages_create_for_stolen(struct drm_device
*dev
,
517 u32 offset
, u32 size
)
519 struct drm_i915_private
*dev_priv
= to_i915(dev
);
521 struct scatterlist
*sg
;
523 GEM_BUG_ON(offset
> dev_priv
->ggtt
.stolen_size
- size
);
525 /* We hide that we have no struct page backing our stolen object
526 * by wrapping the contiguous physical allocation with a fake
527 * dma mapping in a single scatterlist.
530 st
= kmalloc(sizeof(*st
), GFP_KERNEL
);
532 return ERR_PTR(-ENOMEM
);
534 if (sg_alloc_table(st
, 1, GFP_KERNEL
)) {
536 return ERR_PTR(-ENOMEM
);
543 sg_dma_address(sg
) = (dma_addr_t
)dev_priv
->mm
.stolen_base
+ offset
;
544 sg_dma_len(sg
) = size
;
549 static struct sg_table
*
550 i915_gem_object_get_pages_stolen(struct drm_i915_gem_object
*obj
)
552 return i915_pages_create_for_stolen(obj
->base
.dev
,
557 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object
*obj
,
558 struct sg_table
*pages
)
560 /* Should only be called from i915_gem_object_release_stolen() */
561 sg_free_table(pages
);
566 i915_gem_object_release_stolen(struct drm_i915_gem_object
*obj
)
568 struct drm_i915_private
*dev_priv
= to_i915(obj
->base
.dev
);
569 struct drm_mm_node
*stolen
= fetch_and_zero(&obj
->stolen
);
573 __i915_gem_object_unpin_pages(obj
);
575 i915_gem_stolen_remove_node(dev_priv
, stolen
);
579 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops
= {
580 .get_pages
= i915_gem_object_get_pages_stolen
,
581 .put_pages
= i915_gem_object_put_pages_stolen
,
582 .release
= i915_gem_object_release_stolen
,
585 static struct drm_i915_gem_object
*
586 _i915_gem_object_create_stolen(struct drm_device
*dev
,
587 struct drm_mm_node
*stolen
)
589 struct drm_i915_gem_object
*obj
;
591 obj
= i915_gem_object_alloc(dev
);
595 drm_gem_private_object_init(dev
, &obj
->base
, stolen
->size
);
596 i915_gem_object_init(obj
, &i915_gem_object_stolen_ops
);
598 obj
->stolen
= stolen
;
599 obj
->base
.read_domains
= I915_GEM_DOMAIN_CPU
| I915_GEM_DOMAIN_GTT
;
600 obj
->cache_level
= HAS_LLC(to_i915(dev
)) ?
601 I915_CACHE_LLC
: I915_CACHE_NONE
;
603 if (i915_gem_object_pin_pages(obj
))
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
))
627 stolen
= kzalloc(sizeof(*stolen
), GFP_KERNEL
);
631 ret
= i915_gem_stolen_insert_node(dev_priv
, stolen
, size
, 4096);
637 obj
= _i915_gem_object_create_stolen(dev
, stolen
);
641 i915_gem_stolen_remove_node(dev_priv
, stolen
);
646 struct drm_i915_gem_object
*
647 i915_gem_object_create_stolen_for_preallocated(struct drm_device
*dev
,
652 struct drm_i915_private
*dev_priv
= to_i915(dev
);
653 struct i915_ggtt
*ggtt
= &dev_priv
->ggtt
;
654 struct drm_i915_gem_object
*obj
;
655 struct drm_mm_node
*stolen
;
656 struct i915_vma
*vma
;
659 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
662 lockdep_assert_held(&dev
->struct_mutex
);
664 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
665 stolen_offset
, gtt_offset
, size
);
667 /* KISS and expect everything to be page-aligned */
668 if (WARN_ON(size
== 0) || WARN_ON(size
& 4095) ||
669 WARN_ON(stolen_offset
& 4095))
672 stolen
= kzalloc(sizeof(*stolen
), GFP_KERNEL
);
676 stolen
->start
= stolen_offset
;
678 mutex_lock(&dev_priv
->mm
.stolen_lock
);
679 ret
= drm_mm_reserve_node(&dev_priv
->mm
.stolen
, stolen
);
680 mutex_unlock(&dev_priv
->mm
.stolen_lock
);
682 DRM_DEBUG_KMS("failed to allocate stolen space\n");
687 obj
= _i915_gem_object_create_stolen(dev
, stolen
);
689 DRM_DEBUG_KMS("failed to allocate stolen object\n");
690 i915_gem_stolen_remove_node(dev_priv
, stolen
);
695 /* Some objects just need physical mem from stolen space */
696 if (gtt_offset
== I915_GTT_OFFSET_NONE
)
699 ret
= i915_gem_object_pin_pages(obj
);
703 vma
= i915_gem_obj_lookup_or_create_vma(obj
, &ggtt
->base
, NULL
);
709 /* To simplify the initialisation sequence between KMS and GTT,
710 * we allow construction of the stolen object prior to
711 * setting up the GTT space. The actual reservation will occur
714 vma
->node
.start
= gtt_offset
;
715 vma
->node
.size
= size
;
717 ret
= drm_mm_reserve_node(&ggtt
->base
.mm
, &vma
->node
);
719 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
723 vma
->pages
= obj
->mm
.pages
;
724 vma
->flags
|= I915_VMA_GLOBAL_BIND
;
725 __i915_vma_set_map_and_fenceable(vma
);
726 list_move_tail(&vma
->vm_link
, &ggtt
->base
.inactive_list
);
727 list_move_tail(&obj
->global_link
, &dev_priv
->mm
.bound_list
);
733 i915_gem_object_unpin_pages(obj
);
735 i915_gem_object_put(obj
);