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
;
93 /* Almost universally we can find the Graphics Base of Stolen Memory
94 * at offset 0x5c in the igfx configuration space. On a few (desktop)
95 * machines this is also mirrored in the bridge device at different
96 * locations, or in the MCHBAR.
98 * On 865 we just check the TOUD register.
100 * On 830/845/85x the stolen memory base isn't available in any
101 * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
105 if (INTEL_INFO(dev
)->gen
>= 3) {
106 /* Read Graphics Base of Stolen Memory directly */
107 pci_read_config_dword(dev
->pdev
, 0x5c, &base
);
108 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
;
188 /* make sure we don't clobber the GTT if it's within stolen memory */
189 if (INTEL_INFO(dev
)->gen
<= 4 && !IS_G33(dev
) && !IS_G4X(dev
)) {
193 { .start
= base
, .end
= base
+ dev_priv
->gtt
.stolen_size
, },
194 { .start
= base
, .end
= base
+ dev_priv
->gtt
.stolen_size
, },
196 u64 gtt_start
, gtt_end
;
198 gtt_start
= I915_READ(PGTBL_CTL
);
200 gtt_start
= (gtt_start
& PGTBL_ADDRESS_LO_MASK
) |
201 (gtt_start
& PGTBL_ADDRESS_HI_MASK
) << 28;
203 gtt_start
&= PGTBL_ADDRESS_LO_MASK
;
204 gtt_end
= gtt_start
+ gtt_total_entries(dev_priv
->gtt
) * 4;
206 if (gtt_start
>= stolen
[0].start
&& gtt_start
< stolen
[0].end
)
207 stolen
[0].end
= gtt_start
;
208 if (gtt_end
> stolen
[1].start
&& gtt_end
<= stolen
[1].end
)
209 stolen
[1].start
= gtt_end
;
211 /* pick the larger of the two chunks */
212 if (stolen
[0].end
- stolen
[0].start
>
213 stolen
[1].end
- stolen
[1].start
) {
214 base
= stolen
[0].start
;
215 dev_priv
->gtt
.stolen_size
= stolen
[0].end
- stolen
[0].start
;
217 base
= stolen
[1].start
;
218 dev_priv
->gtt
.stolen_size
= stolen
[1].end
- stolen
[1].start
;
221 if (stolen
[0].start
!= stolen
[1].start
||
222 stolen
[0].end
!= stolen
[1].end
) {
223 DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
224 (unsigned long long) gtt_start
,
225 (unsigned long long) gtt_end
- 1);
226 DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
227 base
, base
+ (u32
) dev_priv
->gtt
.stolen_size
- 1);
232 /* Verify that nothing else uses this physical address. Stolen
233 * memory should be reserved by the BIOS and hidden from the
234 * kernel. So if the region is already marked as busy, something
235 * is seriously wrong.
238 r
= devm_request_mem_region(dev
->dev
, base
, dev_priv
->gtt
.stolen_size
,
239 "Graphics Stolen Memory");
242 * One more attempt but this time requesting region from
243 * base + 1, as we have seen that this resolves the region
244 * conflict with the PCI Bus.
245 * This is a BIOS w/a: Some BIOS wrap stolen in the root
246 * PCI bus, but have an off-by-one error. Hence retry the
247 * reservation starting from 1 instead of 0.
249 r
= devm_request_mem_region(dev
->dev
, base
+ 1,
250 dev_priv
->gtt
.stolen_size
- 1,
251 "Graphics Stolen Memory");
253 * GEN3 firmware likes to smash pci bridges into the stolen
254 * range. Apparently this works.
256 if (r
== NULL
&& !IS_GEN3(dev
)) {
257 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
258 base
, base
+ (uint32_t)dev_priv
->gtt
.stolen_size
);
267 void i915_gem_cleanup_stolen(struct drm_device
*dev
)
269 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
271 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
274 drm_mm_takedown(&dev_priv
->mm
.stolen
);
277 static void g4x_get_stolen_reserved(struct drm_i915_private
*dev_priv
,
278 unsigned long *base
, unsigned long *size
)
280 uint32_t reg_val
= I915_READ(IS_GM45(dev_priv
) ?
281 CTG_STOLEN_RESERVED
:
282 ELK_STOLEN_RESERVED
);
283 unsigned long stolen_top
= dev_priv
->mm
.stolen_base
+
284 dev_priv
->gtt
.stolen_size
;
286 *base
= (reg_val
& G4X_STOLEN_RESERVED_ADDR2_MASK
) << 16;
288 WARN_ON((reg_val
& G4X_STOLEN_RESERVED_ADDR1_MASK
) < *base
);
290 /* On these platforms, the register doesn't have a size field, so the
291 * size is the distance between the base and the top of the stolen
292 * memory. We also have the genuine case where base is zero and there's
293 * nothing reserved. */
297 *size
= stolen_top
- *base
;
300 static void gen6_get_stolen_reserved(struct drm_i915_private
*dev_priv
,
301 unsigned long *base
, unsigned long *size
)
303 uint32_t reg_val
= I915_READ(GEN6_STOLEN_RESERVED
);
305 *base
= reg_val
& GEN6_STOLEN_RESERVED_ADDR_MASK
;
307 switch (reg_val
& GEN6_STOLEN_RESERVED_SIZE_MASK
) {
308 case GEN6_STOLEN_RESERVED_1M
:
311 case GEN6_STOLEN_RESERVED_512K
:
314 case GEN6_STOLEN_RESERVED_256K
:
317 case GEN6_STOLEN_RESERVED_128K
:
322 MISSING_CASE(reg_val
& GEN6_STOLEN_RESERVED_SIZE_MASK
);
326 static void gen7_get_stolen_reserved(struct drm_i915_private
*dev_priv
,
327 unsigned long *base
, unsigned long *size
)
329 uint32_t reg_val
= I915_READ(GEN6_STOLEN_RESERVED
);
331 *base
= reg_val
& GEN7_STOLEN_RESERVED_ADDR_MASK
;
333 switch (reg_val
& GEN7_STOLEN_RESERVED_SIZE_MASK
) {
334 case GEN7_STOLEN_RESERVED_1M
:
337 case GEN7_STOLEN_RESERVED_256K
:
342 MISSING_CASE(reg_val
& GEN7_STOLEN_RESERVED_SIZE_MASK
);
346 static void gen8_get_stolen_reserved(struct drm_i915_private
*dev_priv
,
347 unsigned long *base
, unsigned long *size
)
349 uint32_t reg_val
= I915_READ(GEN6_STOLEN_RESERVED
);
351 *base
= reg_val
& GEN6_STOLEN_RESERVED_ADDR_MASK
;
353 switch (reg_val
& GEN8_STOLEN_RESERVED_SIZE_MASK
) {
354 case GEN8_STOLEN_RESERVED_1M
:
357 case GEN8_STOLEN_RESERVED_2M
:
358 *size
= 2 * 1024 * 1024;
360 case GEN8_STOLEN_RESERVED_4M
:
361 *size
= 4 * 1024 * 1024;
363 case GEN8_STOLEN_RESERVED_8M
:
364 *size
= 8 * 1024 * 1024;
367 *size
= 8 * 1024 * 1024;
368 MISSING_CASE(reg_val
& GEN8_STOLEN_RESERVED_SIZE_MASK
);
372 static void bdw_get_stolen_reserved(struct drm_i915_private
*dev_priv
,
373 unsigned long *base
, unsigned long *size
)
375 uint32_t reg_val
= I915_READ(GEN6_STOLEN_RESERVED
);
376 unsigned long stolen_top
;
378 stolen_top
= dev_priv
->mm
.stolen_base
+ dev_priv
->gtt
.stolen_size
;
380 *base
= reg_val
& GEN6_STOLEN_RESERVED_ADDR_MASK
;
382 /* On these platforms, the register doesn't have a size field, so the
383 * size is the distance between the base and the top of the stolen
384 * memory. We also have the genuine case where base is zero and there's
385 * nothing reserved. */
389 *size
= stolen_top
- *base
;
392 int i915_gem_init_stolen(struct drm_device
*dev
)
394 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
395 unsigned long reserved_total
, reserved_base
= 0, reserved_size
;
396 unsigned long stolen_top
;
398 lockinit(&dev_priv
->mm
.stolen_lock
, "i915msl", 0, LK_CANRECURSE
);
400 /* Stolen memory support is still incomplete */
404 #ifdef CONFIG_INTEL_IOMMU
405 if (intel_iommu_gfx_mapped
&& INTEL_INFO(dev
)->gen
< 8) {
406 DRM_INFO("DMAR active, disabling use of stolen memory\n");
411 if (dev_priv
->gtt
.stolen_size
== 0)
414 dev_priv
->mm
.stolen_base
= i915_stolen_to_physical(dev
);
415 if (dev_priv
->mm
.stolen_base
== 0)
418 stolen_top
= dev_priv
->mm
.stolen_base
+ dev_priv
->gtt
.stolen_size
;
420 switch (INTEL_INFO(dev_priv
)->gen
) {
426 g4x_get_stolen_reserved(dev_priv
, &reserved_base
,
430 /* Assume the gen6 maximum for the older platforms. */
431 reserved_size
= 1024 * 1024;
432 reserved_base
= stolen_top
- reserved_size
;
435 gen6_get_stolen_reserved(dev_priv
, &reserved_base
,
439 gen7_get_stolen_reserved(dev_priv
, &reserved_base
,
443 if (IS_BROADWELL(dev_priv
) ||
444 IS_SKYLAKE(dev_priv
) || IS_KABYLAKE(dev
))
445 bdw_get_stolen_reserved(dev_priv
, &reserved_base
,
448 gen8_get_stolen_reserved(dev_priv
, &reserved_base
,
453 /* It is possible for the reserved base to be zero, but the register
454 * field for size doesn't have a zero option. */
455 if (reserved_base
== 0) {
457 reserved_base
= stolen_top
;
460 if (reserved_base
< dev_priv
->mm
.stolen_base
||
461 reserved_base
+ reserved_size
> stolen_top
) {
462 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
463 reserved_base
, reserved_base
+ reserved_size
,
464 dev_priv
->mm
.stolen_base
, stolen_top
);
468 dev_priv
->gtt
.stolen_reserved_base
= reserved_base
;
469 dev_priv
->gtt
.stolen_reserved_size
= reserved_size
;
471 /* It is possible for the reserved area to end before the end of stolen
472 * memory, so just consider the start. */
473 reserved_total
= stolen_top
- reserved_base
;
475 DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
476 dev_priv
->gtt
.stolen_size
>> 10,
477 (dev_priv
->gtt
.stolen_size
- reserved_total
) >> 10);
479 dev_priv
->gtt
.stolen_usable_size
= dev_priv
->gtt
.stolen_size
-
483 * Basic memrange allocator for stolen space.
485 * TODO: Notice that some platforms require us to not use the first page
486 * of the stolen memory but their BIOSes may still put the framebuffer
487 * on the first page. So we don't reserve this page for now because of
488 * that. Our current solution is to just prevent new nodes from being
489 * inserted on the first page - see the check we have at
490 * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
493 drm_mm_init(&dev_priv
->mm
.stolen
, 0, dev_priv
->gtt
.stolen_usable_size
);
498 static struct sg_table
*
499 i915_pages_create_for_stolen(struct drm_device
*dev
,
500 u32 offset
, u32 size
)
502 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
504 struct scatterlist
*sg
;
506 DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset
, size
);
507 BUG_ON(offset
> dev_priv
->gtt
.stolen_size
- size
);
509 /* We hide that we have no struct page backing our stolen object
510 * by wrapping the contiguous physical allocation with a fake
511 * dma mapping in a single scatterlist.
514 st
= kmalloc(sizeof(*st
), M_DRM
, M_WAITOK
);
518 if (sg_alloc_table(st
, 1, GFP_KERNEL
)) {
527 sg_dma_address(sg
) = (dma_addr_t
)dev_priv
->mm
.stolen_base
+ offset
;
528 sg_dma_len(sg
) = size
;
533 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object
*obj
)
539 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object
*obj
)
541 /* Should only be called during free */
542 sg_free_table(obj
->pages
);
548 i915_gem_object_release_stolen(struct drm_i915_gem_object
*obj
)
550 struct drm_i915_private
*dev_priv
= obj
->base
.dev
->dev_private
;
553 i915_gem_stolen_remove_node(dev_priv
, obj
->stolen
);
558 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops
= {
559 .get_pages
= i915_gem_object_get_pages_stolen
,
560 .put_pages
= i915_gem_object_put_pages_stolen
,
561 .release
= i915_gem_object_release_stolen
,
564 static struct drm_i915_gem_object
*
565 _i915_gem_object_create_stolen(struct drm_device
*dev
,
566 struct drm_mm_node
*stolen
)
568 struct drm_i915_gem_object
*obj
;
570 obj
= i915_gem_object_alloc(dev
);
574 drm_gem_private_object_init(dev
, &obj
->base
, stolen
->size
);
575 i915_gem_object_init(obj
, &i915_gem_object_stolen_ops
);
577 obj
->pages
= i915_pages_create_for_stolen(dev
,
578 stolen
->start
, stolen
->size
);
579 if (obj
->pages
== NULL
)
582 obj
->get_page
.sg
= obj
->pages
->sgl
;
583 obj
->get_page
.last
= 0;
585 i915_gem_object_pin_pages(obj
);
586 obj
->stolen
= stolen
;
588 obj
->base
.read_domains
= I915_GEM_DOMAIN_CPU
| I915_GEM_DOMAIN_GTT
;
589 obj
->cache_level
= HAS_LLC(dev
) ? I915_CACHE_LLC
: I915_CACHE_NONE
;
594 i915_gem_object_free(obj
);
598 struct drm_i915_gem_object
*
599 i915_gem_object_create_stolen(struct drm_device
*dev
, u32 size
)
601 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
602 struct drm_i915_gem_object
*obj
;
603 struct drm_mm_node
*stolen
;
606 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
609 DRM_DEBUG_KMS("creating stolen object: size=%x\n", size
);
613 stolen
= kzalloc(sizeof(*stolen
), GFP_KERNEL
);
617 ret
= i915_gem_stolen_insert_node(dev_priv
, stolen
, size
, 4096);
623 obj
= _i915_gem_object_create_stolen(dev
, stolen
);
627 i915_gem_stolen_remove_node(dev_priv
, stolen
);
632 struct drm_i915_gem_object
*
633 i915_gem_object_create_stolen_for_preallocated(struct drm_device
*dev
,
638 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
639 struct i915_address_space
*ggtt
= &dev_priv
->gtt
.base
;
640 struct drm_i915_gem_object
*obj
;
641 struct drm_mm_node
*stolen
;
642 struct i915_vma
*vma
;
645 if (!drm_mm_initialized(&dev_priv
->mm
.stolen
))
648 lockdep_assert_held(&dev
->struct_mutex
);
650 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
651 stolen_offset
, gtt_offset
, size
);
653 /* KISS and expect everything to be page-aligned */
654 if (WARN_ON(size
== 0) || WARN_ON(size
& 4095) ||
655 WARN_ON(stolen_offset
& 4095))
658 stolen
= kzalloc(sizeof(*stolen
), GFP_KERNEL
);
662 stolen
->start
= stolen_offset
;
664 mutex_lock(&dev_priv
->mm
.stolen_lock
);
665 ret
= drm_mm_reserve_node(&dev_priv
->mm
.stolen
, stolen
);
666 mutex_unlock(&dev_priv
->mm
.stolen_lock
);
668 DRM_DEBUG_KMS("failed to allocate stolen space\n");
673 obj
= _i915_gem_object_create_stolen(dev
, stolen
);
675 DRM_DEBUG_KMS("failed to allocate stolen object\n");
676 i915_gem_stolen_remove_node(dev_priv
, stolen
);
681 /* Some objects just need physical mem from stolen space */
682 if (gtt_offset
== I915_GTT_OFFSET_NONE
)
685 vma
= i915_gem_obj_lookup_or_create_vma(obj
, ggtt
);
691 /* To simplify the initialisation sequence between KMS and GTT,
692 * we allow construction of the stolen object prior to
693 * setting up the GTT space. The actual reservation will occur
696 vma
->node
.start
= gtt_offset
;
697 vma
->node
.size
= size
;
698 if (drm_mm_initialized(&ggtt
->mm
)) {
699 ret
= drm_mm_reserve_node(&ggtt
->mm
, &vma
->node
);
701 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
705 vma
->bound
|= GLOBAL_BIND
;
706 __i915_vma_set_map_and_fenceable(vma
);
707 list_add_tail(&vma
->vm_link
, &ggtt
->inactive_list
);
710 list_add_tail(&obj
->global_list
, &dev_priv
->mm
.bound_list
);
711 i915_gem_object_pin_pages(obj
);
716 drm_gem_object_unreference(&obj
->base
);