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_GEN(dev_priv
) >= 3) {
115 pci_read_config_dword(pdev
, INTEL_BSM
, &bsm
);
117 base
= bsm
& INTEL_BSM_MASK
;
118 } else if (IS_I865G(dev_priv
)) {
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_priv
)) {
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_priv
)) {
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_priv
)) {
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_GEN(dev_priv
) <= 4 && !IS_G33(dev_priv
) &&
212 { .start
= base
, .end
= base
+ ggtt
->stolen_size
, },
213 { .start
= base
, .end
= base
+ ggtt
->stolen_size
, },
215 u64 ggtt_start
, ggtt_end
;
217 ggtt_start
= I915_READ(PGTBL_CTL
);
218 if (IS_GEN4(dev_priv
))
219 ggtt_start
= (ggtt_start
& PGTBL_ADDRESS_LO_MASK
) |
220 (ggtt_start
& PGTBL_ADDRESS_HI_MASK
) << 28;
222 ggtt_start
&= PGTBL_ADDRESS_LO_MASK
;
223 ggtt_end
= ggtt_start
+ ggtt_total_entries(ggtt
) * 4;
225 if (ggtt_start
>= stolen
[0].start
&& ggtt_start
< stolen
[0].end
)
226 stolen
[0].end
= ggtt_start
;
227 if (ggtt_end
> stolen
[1].start
&& ggtt_end
<= stolen
[1].end
)
228 stolen
[1].start
= ggtt_end
;
230 /* pick the larger of the two chunks */
231 if (stolen
[0].end
- stolen
[0].start
>
232 stolen
[1].end
- stolen
[1].start
) {
233 base
= stolen
[0].start
;
234 ggtt
->stolen_size
= stolen
[0].end
- stolen
[0].start
;
236 base
= stolen
[1].start
;
237 ggtt
->stolen_size
= stolen
[1].end
- stolen
[1].start
;
240 if (stolen
[0].start
!= stolen
[1].start
||
241 stolen
[0].end
!= stolen
[1].end
) {
242 DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
243 (unsigned long long)ggtt_start
,
244 (unsigned long long)ggtt_end
- 1);
245 DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
246 base
, base
+ (u32
)ggtt
->stolen_size
- 1);
251 /* Verify that nothing else uses this physical address. Stolen
252 * memory should be reserved by the BIOS and hidden from the
253 * kernel. So if the region is already marked as busy, something
254 * is seriously wrong.
256 r
= devm_request_mem_region(dev
->dev
, base
, ggtt
->stolen_size
,
257 "Graphics Stolen Memory");
260 * One more attempt but this time requesting region from
261 * base + 1, as we have seen that this resolves the region
262 * conflict with the PCI Bus.
263 * This is a BIOS w/a: Some BIOS wrap stolen in the root
264 * PCI bus, but have an off-by-one error. Hence retry the
265 * reservation starting from 1 instead of 0.
267 r
= devm_request_mem_region(dev
->dev
, base
+ 1,
268 ggtt
->stolen_size
- 1,
269 "Graphics Stolen Memory");
271 * GEN3 firmware likes to smash pci bridges into the stolen
272 * range. Apparently this works.
274 if (r
== NULL
&& !IS_GEN3(dev_priv
)) {
275 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
276 base
, base
+ (uint32_t)ggtt
->stolen_size
);
284 void i915_gem_cleanup_stolen(struct drm_device
*dev
)
286 struct drm_i915_private
*dev_priv
= to_i915(dev
);
288 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
291 drm_mm_takedown(&dev_priv
->mm
.stolen
);
294 static void g4x_get_stolen_reserved(struct drm_i915_private
*dev_priv
,
295 unsigned long *base
, unsigned long *size
)
297 struct i915_ggtt
*ggtt
= &dev_priv
->ggtt
;
298 uint32_t reg_val
= I915_READ(IS_GM45(dev_priv
) ?
299 CTG_STOLEN_RESERVED
:
300 ELK_STOLEN_RESERVED
);
301 unsigned long stolen_top
= dev_priv
->mm
.stolen_base
+
304 *base
= (reg_val
& G4X_STOLEN_RESERVED_ADDR2_MASK
) << 16;
306 WARN_ON((reg_val
& G4X_STOLEN_RESERVED_ADDR1_MASK
) < *base
);
308 /* On these platforms, the register doesn't have a size field, so the
309 * size is the distance between the base and the top of the stolen
310 * memory. We also have the genuine case where base is zero and there's
311 * nothing reserved. */
315 *size
= stolen_top
- *base
;
318 static void gen6_get_stolen_reserved(struct drm_i915_private
*dev_priv
,
319 unsigned long *base
, unsigned long *size
)
321 uint32_t reg_val
= I915_READ(GEN6_STOLEN_RESERVED
);
323 *base
= reg_val
& GEN6_STOLEN_RESERVED_ADDR_MASK
;
325 switch (reg_val
& GEN6_STOLEN_RESERVED_SIZE_MASK
) {
326 case GEN6_STOLEN_RESERVED_1M
:
329 case GEN6_STOLEN_RESERVED_512K
:
332 case GEN6_STOLEN_RESERVED_256K
:
335 case GEN6_STOLEN_RESERVED_128K
:
340 MISSING_CASE(reg_val
& GEN6_STOLEN_RESERVED_SIZE_MASK
);
344 static void gen7_get_stolen_reserved(struct drm_i915_private
*dev_priv
,
345 unsigned long *base
, unsigned long *size
)
347 uint32_t reg_val
= I915_READ(GEN6_STOLEN_RESERVED
);
349 *base
= reg_val
& GEN7_STOLEN_RESERVED_ADDR_MASK
;
351 switch (reg_val
& GEN7_STOLEN_RESERVED_SIZE_MASK
) {
352 case GEN7_STOLEN_RESERVED_1M
:
355 case GEN7_STOLEN_RESERVED_256K
:
360 MISSING_CASE(reg_val
& GEN7_STOLEN_RESERVED_SIZE_MASK
);
364 static void gen8_get_stolen_reserved(struct drm_i915_private
*dev_priv
,
365 unsigned long *base
, unsigned long *size
)
367 uint32_t reg_val
= I915_READ(GEN6_STOLEN_RESERVED
);
369 *base
= reg_val
& GEN6_STOLEN_RESERVED_ADDR_MASK
;
371 switch (reg_val
& GEN8_STOLEN_RESERVED_SIZE_MASK
) {
372 case GEN8_STOLEN_RESERVED_1M
:
375 case GEN8_STOLEN_RESERVED_2M
:
376 *size
= 2 * 1024 * 1024;
378 case GEN8_STOLEN_RESERVED_4M
:
379 *size
= 4 * 1024 * 1024;
381 case GEN8_STOLEN_RESERVED_8M
:
382 *size
= 8 * 1024 * 1024;
385 *size
= 8 * 1024 * 1024;
386 MISSING_CASE(reg_val
& GEN8_STOLEN_RESERVED_SIZE_MASK
);
390 static void bdw_get_stolen_reserved(struct drm_i915_private
*dev_priv
,
391 unsigned long *base
, unsigned long *size
)
393 struct i915_ggtt
*ggtt
= &dev_priv
->ggtt
;
394 uint32_t reg_val
= I915_READ(GEN6_STOLEN_RESERVED
);
395 unsigned long stolen_top
;
397 stolen_top
= dev_priv
->mm
.stolen_base
+ ggtt
->stolen_size
;
399 *base
= reg_val
& GEN6_STOLEN_RESERVED_ADDR_MASK
;
401 /* On these platforms, the register doesn't have a size field, so the
402 * size is the distance between the base and the top of the stolen
403 * memory. We also have the genuine case where base is zero and there's
404 * nothing reserved. */
408 *size
= stolen_top
- *base
;
411 int i915_gem_init_stolen(struct drm_device
*dev
)
413 struct drm_i915_private
*dev_priv
= to_i915(dev
);
414 struct i915_ggtt
*ggtt
= &dev_priv
->ggtt
;
415 unsigned long reserved_total
, reserved_base
= 0, reserved_size
;
416 unsigned long stolen_top
;
418 mutex_init(&dev_priv
->mm
.stolen_lock
);
420 #ifdef CONFIG_INTEL_IOMMU
421 if (intel_iommu_gfx_mapped
&& INTEL_INFO(dev
)->gen
< 8) {
422 DRM_INFO("DMAR active, disabling use of stolen memory\n");
427 if (ggtt
->stolen_size
== 0)
430 dev_priv
->mm
.stolen_base
= i915_stolen_to_physical(dev
);
431 if (dev_priv
->mm
.stolen_base
== 0)
434 stolen_top
= dev_priv
->mm
.stolen_base
+ ggtt
->stolen_size
;
436 switch (INTEL_INFO(dev_priv
)->gen
) {
441 if (IS_G4X(dev_priv
))
442 g4x_get_stolen_reserved(dev_priv
, &reserved_base
,
446 /* Assume the gen6 maximum for the older platforms. */
447 reserved_size
= 1024 * 1024;
448 reserved_base
= stolen_top
- reserved_size
;
451 gen6_get_stolen_reserved(dev_priv
, &reserved_base
,
455 gen7_get_stolen_reserved(dev_priv
, &reserved_base
,
459 if (IS_BROADWELL(dev_priv
) ||
460 IS_SKYLAKE(dev_priv
) || IS_KABYLAKE(dev_priv
))
461 bdw_get_stolen_reserved(dev_priv
, &reserved_base
,
464 gen8_get_stolen_reserved(dev_priv
, &reserved_base
,
469 /* It is possible for the reserved base to be zero, but the register
470 * field for size doesn't have a zero option. */
471 if (reserved_base
== 0) {
473 reserved_base
= stolen_top
;
476 if (reserved_base
< dev_priv
->mm
.stolen_base
||
477 reserved_base
+ reserved_size
> stolen_top
) {
478 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
479 reserved_base
, reserved_base
+ reserved_size
,
480 dev_priv
->mm
.stolen_base
, stolen_top
);
484 ggtt
->stolen_reserved_base
= reserved_base
;
485 ggtt
->stolen_reserved_size
= reserved_size
;
487 /* It is possible for the reserved area to end before the end of stolen
488 * memory, so just consider the start. */
489 reserved_total
= stolen_top
- reserved_base
;
491 DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
492 ggtt
->stolen_size
>> 10,
493 (ggtt
->stolen_size
- reserved_total
) >> 10);
495 ggtt
->stolen_usable_size
= ggtt
->stolen_size
- reserved_total
;
498 * Basic memrange allocator for stolen space.
500 * TODO: Notice that some platforms require us to not use the first page
501 * of the stolen memory but their BIOSes may still put the framebuffer
502 * on the first page. So we don't reserve this page for now because of
503 * that. Our current solution is to just prevent new nodes from being
504 * inserted on the first page - see the check we have at
505 * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
508 drm_mm_init(&dev_priv
->mm
.stolen
, 0, ggtt
->stolen_usable_size
);
513 static struct sg_table
*
514 i915_pages_create_for_stolen(struct drm_device
*dev
,
515 u32 offset
, u32 size
)
517 struct drm_i915_private
*dev_priv
= to_i915(dev
);
518 struct i915_ggtt
*ggtt
= &dev_priv
->ggtt
;
520 struct scatterlist
*sg
;
522 DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset
, size
);
523 BUG_ON(offset
> 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
);
534 if (sg_alloc_table(st
, 1, GFP_KERNEL
)) {
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 during free */
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
);
570 __i915_gem_object_unpin_pages(obj
);
573 i915_gem_stolen_remove_node(dev_priv
, obj
->stolen
);
578 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops
= {
579 .get_pages
= i915_gem_object_get_pages_stolen
,
580 .put_pages
= i915_gem_object_put_pages_stolen
,
581 .release
= i915_gem_object_release_stolen
,
584 static struct drm_i915_gem_object
*
585 _i915_gem_object_create_stolen(struct drm_device
*dev
,
586 struct drm_mm_node
*stolen
)
588 struct drm_i915_gem_object
*obj
;
590 obj
= i915_gem_object_alloc(dev
);
594 drm_gem_private_object_init(dev
, &obj
->base
, stolen
->size
);
595 i915_gem_object_init(obj
, &i915_gem_object_stolen_ops
);
597 obj
->stolen
= stolen
;
598 obj
->base
.read_domains
= I915_GEM_DOMAIN_CPU
| I915_GEM_DOMAIN_GTT
;
599 obj
->cache_level
= HAS_LLC(dev
) ? I915_CACHE_LLC
: I915_CACHE_NONE
;
601 if (i915_gem_object_pin_pages(obj
))
607 i915_gem_object_free(obj
);
611 struct drm_i915_gem_object
*
612 i915_gem_object_create_stolen(struct drm_device
*dev
, u32 size
)
614 struct drm_i915_private
*dev_priv
= to_i915(dev
);
615 struct drm_i915_gem_object
*obj
;
616 struct drm_mm_node
*stolen
;
619 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
622 DRM_DEBUG_KMS("creating stolen object: size=%x\n", size
);
626 stolen
= kzalloc(sizeof(*stolen
), GFP_KERNEL
);
630 ret
= i915_gem_stolen_insert_node(dev_priv
, stolen
, size
, 4096);
636 obj
= _i915_gem_object_create_stolen(dev
, stolen
);
640 i915_gem_stolen_remove_node(dev_priv
, stolen
);
645 struct drm_i915_gem_object
*
646 i915_gem_object_create_stolen_for_preallocated(struct drm_device
*dev
,
651 struct drm_i915_private
*dev_priv
= to_i915(dev
);
652 struct i915_ggtt
*ggtt
= &dev_priv
->ggtt
;
653 struct drm_i915_gem_object
*obj
;
654 struct drm_mm_node
*stolen
;
655 struct i915_vma
*vma
;
658 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
661 lockdep_assert_held(&dev
->struct_mutex
);
663 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
664 stolen_offset
, gtt_offset
, size
);
666 /* KISS and expect everything to be page-aligned */
667 if (WARN_ON(size
== 0) || WARN_ON(size
& 4095) ||
668 WARN_ON(stolen_offset
& 4095))
671 stolen
= kzalloc(sizeof(*stolen
), GFP_KERNEL
);
675 stolen
->start
= stolen_offset
;
677 mutex_lock(&dev_priv
->mm
.stolen_lock
);
678 ret
= drm_mm_reserve_node(&dev_priv
->mm
.stolen
, stolen
);
679 mutex_unlock(&dev_priv
->mm
.stolen_lock
);
681 DRM_DEBUG_KMS("failed to allocate stolen space\n");
686 obj
= _i915_gem_object_create_stolen(dev
, stolen
);
688 DRM_DEBUG_KMS("failed to allocate stolen object\n");
689 i915_gem_stolen_remove_node(dev_priv
, stolen
);
694 /* Some objects just need physical mem from stolen space */
695 if (gtt_offset
== I915_GTT_OFFSET_NONE
)
698 ret
= i915_gem_object_pin_pages(obj
);
702 vma
= i915_gem_obj_lookup_or_create_vma(obj
, &ggtt
->base
, NULL
);
708 /* To simplify the initialisation sequence between KMS and GTT,
709 * we allow construction of the stolen object prior to
710 * setting up the GTT space. The actual reservation will occur
713 vma
->node
.start
= gtt_offset
;
714 vma
->node
.size
= size
;
716 ret
= drm_mm_reserve_node(&ggtt
->base
.mm
, &vma
->node
);
718 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
722 vma
->pages
= obj
->mm
.pages
;
723 vma
->flags
|= I915_VMA_GLOBAL_BIND
;
724 __i915_vma_set_map_and_fenceable(vma
);
725 list_move_tail(&vma
->vm_link
, &ggtt
->base
.inactive_list
);
726 list_move_tail(&obj
->global_link
, &dev_priv
->mm
.bound_list
);
732 i915_gem_object_unpin_pages(obj
);
734 i915_gem_object_put(obj
);