2 * Copyright © 2010 Daniel Vetter
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
26 #include <drm/i915_drm.h>
28 #include "i915_trace.h"
29 #include "intel_drv.h"
31 typedef uint32_t gtt_pte_t
;
34 #define GEN6_GTT_ADDR_ENCODE(addr) ((addr) | (((addr) >> 28) & 0xff0))
36 #define GEN6_PDE_VALID (1 << 0)
37 /* gen6+ has bit 11-4 for physical addr bit 39-32 */
38 #define GEN6_PDE_ADDR_ENCODE(addr) GEN6_GTT_ADDR_ENCODE(addr)
40 #define GEN6_PTE_VALID (1 << 0)
41 #define GEN6_PTE_UNCACHED (1 << 1)
42 #define HSW_PTE_UNCACHED (0)
43 #define GEN6_PTE_CACHE_LLC (2 << 1)
44 #define GEN6_PTE_CACHE_LLC_MLC (3 << 1)
45 #define GEN6_PTE_ADDR_ENCODE(addr) GEN6_GTT_ADDR_ENCODE(addr)
47 static inline gtt_pte_t
pte_encode(struct drm_device
*dev
,
49 enum i915_cache_level level
)
51 gtt_pte_t pte
= GEN6_PTE_VALID
;
52 pte
|= GEN6_PTE_ADDR_ENCODE(addr
);
55 case I915_CACHE_LLC_MLC
:
56 /* Haswell doesn't set L3 this way */
58 pte
|= GEN6_PTE_CACHE_LLC
;
60 pte
|= GEN6_PTE_CACHE_LLC_MLC
;
63 pte
|= GEN6_PTE_CACHE_LLC
;
67 pte
|= HSW_PTE_UNCACHED
;
69 pte
|= GEN6_PTE_UNCACHED
;
79 /* PPGTT support for Sandybdrige/Gen6 and later */
80 static void i915_ppgtt_clear_range(struct i915_hw_ppgtt
*ppgtt
,
85 gtt_pte_t scratch_pte
;
86 unsigned act_pd
= first_entry
/ I915_PPGTT_PT_ENTRIES
;
87 unsigned first_pte
= first_entry
% I915_PPGTT_PT_ENTRIES
;
90 scratch_pte
= pte_encode(ppgtt
->dev
, ppgtt
->scratch_page_dma_addr
,
94 last_pte
= first_pte
+ num_entries
;
95 if (last_pte
> I915_PPGTT_PT_ENTRIES
)
96 last_pte
= I915_PPGTT_PT_ENTRIES
;
98 pt_vaddr
= kmap_atomic(ppgtt
->pt_pages
[act_pd
]);
100 for (i
= first_pte
; i
< last_pte
; i
++)
101 pt_vaddr
[i
] = scratch_pte
;
103 kunmap_atomic(pt_vaddr
);
105 num_entries
-= last_pte
- first_pte
;
111 int i915_gem_init_aliasing_ppgtt(struct drm_device
*dev
)
113 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
114 struct i915_hw_ppgtt
*ppgtt
;
115 unsigned first_pd_entry_in_global_pt
;
119 /* ppgtt PDEs reside in the global gtt pagetable, which has 512*1024
120 * entries. For aliasing ppgtt support we just steal them at the end for
122 first_pd_entry_in_global_pt
= dev_priv
->mm
.gtt
->gtt_total_entries
- I915_PPGTT_PD_ENTRIES
;
124 ppgtt
= kzalloc(sizeof(*ppgtt
), GFP_KERNEL
);
129 ppgtt
->num_pd_entries
= I915_PPGTT_PD_ENTRIES
;
130 ppgtt
->pt_pages
= kzalloc(sizeof(struct page
*)*ppgtt
->num_pd_entries
,
132 if (!ppgtt
->pt_pages
)
135 for (i
= 0; i
< ppgtt
->num_pd_entries
; i
++) {
136 ppgtt
->pt_pages
[i
] = alloc_page(GFP_KERNEL
);
137 if (!ppgtt
->pt_pages
[i
])
141 if (dev_priv
->mm
.gtt
->needs_dmar
) {
142 ppgtt
->pt_dma_addr
= kzalloc(sizeof(dma_addr_t
)
143 *ppgtt
->num_pd_entries
,
145 if (!ppgtt
->pt_dma_addr
)
148 for (i
= 0; i
< ppgtt
->num_pd_entries
; i
++) {
151 pt_addr
= pci_map_page(dev
->pdev
, ppgtt
->pt_pages
[i
],
153 PCI_DMA_BIDIRECTIONAL
);
155 if (pci_dma_mapping_error(dev
->pdev
,
161 ppgtt
->pt_dma_addr
[i
] = pt_addr
;
165 ppgtt
->scratch_page_dma_addr
= dev_priv
->mm
.gtt
->scratch_page_dma
;
167 i915_ppgtt_clear_range(ppgtt
, 0,
168 ppgtt
->num_pd_entries
*I915_PPGTT_PT_ENTRIES
);
170 ppgtt
->pd_offset
= (first_pd_entry_in_global_pt
)*sizeof(gtt_pte_t
);
172 dev_priv
->mm
.aliasing_ppgtt
= ppgtt
;
177 if (ppgtt
->pt_dma_addr
) {
178 for (i
--; i
>= 0; i
--)
179 pci_unmap_page(dev
->pdev
, ppgtt
->pt_dma_addr
[i
],
180 4096, PCI_DMA_BIDIRECTIONAL
);
183 kfree(ppgtt
->pt_dma_addr
);
184 for (i
= 0; i
< ppgtt
->num_pd_entries
; i
++) {
185 if (ppgtt
->pt_pages
[i
])
186 __free_page(ppgtt
->pt_pages
[i
]);
188 kfree(ppgtt
->pt_pages
);
195 void i915_gem_cleanup_aliasing_ppgtt(struct drm_device
*dev
)
197 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
198 struct i915_hw_ppgtt
*ppgtt
= dev_priv
->mm
.aliasing_ppgtt
;
204 if (ppgtt
->pt_dma_addr
) {
205 for (i
= 0; i
< ppgtt
->num_pd_entries
; i
++)
206 pci_unmap_page(dev
->pdev
, ppgtt
->pt_dma_addr
[i
],
207 4096, PCI_DMA_BIDIRECTIONAL
);
210 kfree(ppgtt
->pt_dma_addr
);
211 for (i
= 0; i
< ppgtt
->num_pd_entries
; i
++)
212 __free_page(ppgtt
->pt_pages
[i
]);
213 kfree(ppgtt
->pt_pages
);
217 static void i915_ppgtt_insert_sg_entries(struct i915_hw_ppgtt
*ppgtt
,
218 const struct sg_table
*pages
,
219 unsigned first_entry
,
220 enum i915_cache_level cache_level
)
223 unsigned act_pd
= first_entry
/ I915_PPGTT_PT_ENTRIES
;
224 unsigned first_pte
= first_entry
% I915_PPGTT_PT_ENTRIES
;
225 unsigned i
, j
, m
, segment_len
;
226 dma_addr_t page_addr
;
227 struct scatterlist
*sg
;
229 /* init sg walking */
232 segment_len
= sg_dma_len(sg
) >> PAGE_SHIFT
;
235 while (i
< pages
->nents
) {
236 pt_vaddr
= kmap_atomic(ppgtt
->pt_pages
[act_pd
]);
238 for (j
= first_pte
; j
< I915_PPGTT_PT_ENTRIES
; j
++) {
239 page_addr
= sg_dma_address(sg
) + (m
<< PAGE_SHIFT
);
240 pt_vaddr
[j
] = pte_encode(ppgtt
->dev
, page_addr
,
243 /* grab the next page */
244 if (++m
== segment_len
) {
245 if (++i
== pages
->nents
)
249 segment_len
= sg_dma_len(sg
) >> PAGE_SHIFT
;
254 kunmap_atomic(pt_vaddr
);
261 void i915_ppgtt_bind_object(struct i915_hw_ppgtt
*ppgtt
,
262 struct drm_i915_gem_object
*obj
,
263 enum i915_cache_level cache_level
)
265 i915_ppgtt_insert_sg_entries(ppgtt
,
267 obj
->gtt_space
->start
>> PAGE_SHIFT
,
271 void i915_ppgtt_unbind_object(struct i915_hw_ppgtt
*ppgtt
,
272 struct drm_i915_gem_object
*obj
)
274 i915_ppgtt_clear_range(ppgtt
,
275 obj
->gtt_space
->start
>> PAGE_SHIFT
,
276 obj
->base
.size
>> PAGE_SHIFT
);
279 void i915_gem_init_ppgtt(struct drm_device
*dev
)
281 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
283 struct intel_ring_buffer
*ring
;
284 struct i915_hw_ppgtt
*ppgtt
= dev_priv
->mm
.aliasing_ppgtt
;
285 uint32_t __iomem
*pd_addr
;
289 if (!dev_priv
->mm
.aliasing_ppgtt
)
293 pd_addr
= dev_priv
->mm
.gtt
->gtt
+ ppgtt
->pd_offset
/sizeof(uint32_t);
294 for (i
= 0; i
< ppgtt
->num_pd_entries
; i
++) {
297 if (dev_priv
->mm
.gtt
->needs_dmar
)
298 pt_addr
= ppgtt
->pt_dma_addr
[i
];
300 pt_addr
= page_to_phys(ppgtt
->pt_pages
[i
]);
302 pd_entry
= GEN6_PDE_ADDR_ENCODE(pt_addr
);
303 pd_entry
|= GEN6_PDE_VALID
;
305 writel(pd_entry
, pd_addr
+ i
);
309 pd_offset
= ppgtt
->pd_offset
;
310 pd_offset
/= 64; /* in cachelines, */
313 if (INTEL_INFO(dev
)->gen
== 6) {
314 uint32_t ecochk
, gab_ctl
, ecobits
;
316 ecobits
= I915_READ(GAC_ECO_BITS
);
317 I915_WRITE(GAC_ECO_BITS
, ecobits
| ECOBITS_PPGTT_CACHE64B
);
319 gab_ctl
= I915_READ(GAB_CTL
);
320 I915_WRITE(GAB_CTL
, gab_ctl
| GAB_CTL_CONT_AFTER_PAGEFAULT
);
322 ecochk
= I915_READ(GAM_ECOCHK
);
323 I915_WRITE(GAM_ECOCHK
, ecochk
| ECOCHK_SNB_BIT
|
324 ECOCHK_PPGTT_CACHE64B
);
325 I915_WRITE(GFX_MODE
, _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE
));
326 } else if (INTEL_INFO(dev
)->gen
>= 7) {
327 I915_WRITE(GAM_ECOCHK
, ECOCHK_PPGTT_CACHE64B
);
328 /* GFX_MODE is per-ring on gen7+ */
331 for_each_ring(ring
, dev_priv
, i
) {
332 if (INTEL_INFO(dev
)->gen
>= 7)
333 I915_WRITE(RING_MODE_GEN7(ring
),
334 _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE
));
336 I915_WRITE(RING_PP_DIR_DCLV(ring
), PP_DIR_DCLV_2G
);
337 I915_WRITE(RING_PP_DIR_BASE(ring
), pd_offset
);
341 static bool do_idling(struct drm_i915_private
*dev_priv
)
343 bool ret
= dev_priv
->mm
.interruptible
;
345 if (unlikely(dev_priv
->mm
.gtt
->do_idle_maps
)) {
346 dev_priv
->mm
.interruptible
= false;
347 if (i915_gpu_idle(dev_priv
->dev
)) {
348 DRM_ERROR("Couldn't idle GPU\n");
349 /* Wait a bit, in hopes it avoids the hang */
357 static void undo_idling(struct drm_i915_private
*dev_priv
, bool interruptible
)
359 if (unlikely(dev_priv
->mm
.gtt
->do_idle_maps
))
360 dev_priv
->mm
.interruptible
= interruptible
;
364 static void i915_ggtt_clear_range(struct drm_device
*dev
,
365 unsigned first_entry
,
366 unsigned num_entries
)
368 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
369 gtt_pte_t scratch_pte
;
370 gtt_pte_t __iomem
*gtt_base
= dev_priv
->mm
.gtt
->gtt
+ first_entry
;
371 const int max_entries
= dev_priv
->mm
.gtt
->gtt_total_entries
- first_entry
;
374 if (INTEL_INFO(dev
)->gen
< 6) {
375 intel_gtt_clear_range(first_entry
, num_entries
);
379 if (WARN(num_entries
> max_entries
,
380 "First entry = %d; Num entries = %d (max=%d)\n",
381 first_entry
, num_entries
, max_entries
))
382 num_entries
= max_entries
;
384 scratch_pte
= pte_encode(dev
, dev_priv
->mm
.gtt
->scratch_page_dma
, I915_CACHE_LLC
);
385 for (i
= 0; i
< num_entries
; i
++)
386 iowrite32(scratch_pte
, >t_base
[i
]);
390 void i915_gem_restore_gtt_mappings(struct drm_device
*dev
)
392 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
393 struct drm_i915_gem_object
*obj
;
395 /* First fill our portion of the GTT with scratch pages */
396 i915_ggtt_clear_range(dev
, dev_priv
->mm
.gtt_start
/ PAGE_SIZE
,
397 (dev_priv
->mm
.gtt_end
- dev_priv
->mm
.gtt_start
) / PAGE_SIZE
);
399 list_for_each_entry(obj
, &dev_priv
->mm
.bound_list
, gtt_list
) {
400 i915_gem_clflush_object(obj
);
401 i915_gem_gtt_bind_object(obj
, obj
->cache_level
);
404 i915_gem_chipset_flush(dev
);
407 int i915_gem_gtt_prepare_object(struct drm_i915_gem_object
*obj
)
409 if (obj
->has_dma_mapping
)
412 if (!dma_map_sg(&obj
->base
.dev
->pdev
->dev
,
413 obj
->pages
->sgl
, obj
->pages
->nents
,
414 PCI_DMA_BIDIRECTIONAL
))
421 * Binds an object into the global gtt with the specified cache level. The object
422 * will be accessible to the GPU via commands whose operands reference offsets
423 * within the global GTT as well as accessible by the GPU through the GMADR
424 * mapped BAR (dev_priv->mm.gtt->gtt).
426 static void gen6_ggtt_bind_object(struct drm_i915_gem_object
*obj
,
427 enum i915_cache_level level
)
429 struct drm_device
*dev
= obj
->base
.dev
;
430 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
431 struct sg_table
*st
= obj
->pages
;
432 struct scatterlist
*sg
= st
->sgl
;
433 const int first_entry
= obj
->gtt_space
->start
>> PAGE_SHIFT
;
434 const int max_entries
= dev_priv
->mm
.gtt
->gtt_total_entries
- first_entry
;
435 gtt_pte_t __iomem
*gtt_entries
= dev_priv
->mm
.gtt
->gtt
+ first_entry
;
437 unsigned int len
, m
= 0;
440 for_each_sg(st
->sgl
, sg
, st
->nents
, unused
) {
441 len
= sg_dma_len(sg
) >> PAGE_SHIFT
;
442 for (m
= 0; m
< len
; m
++) {
443 addr
= sg_dma_address(sg
) + (m
<< PAGE_SHIFT
);
444 iowrite32(pte_encode(dev
, addr
, level
), >t_entries
[i
]);
449 BUG_ON(i
> max_entries
);
450 BUG_ON(i
!= obj
->base
.size
/ PAGE_SIZE
);
452 /* XXX: This serves as a posting read to make sure that the PTE has
453 * actually been updated. There is some concern that even though
454 * registers and PTEs are within the same BAR that they are potentially
455 * of NUMA access patterns. Therefore, even with the way we assume
456 * hardware should work, we must keep this posting read for paranoia.
459 WARN_ON(readl(>t_entries
[i
-1]) != pte_encode(dev
, addr
, level
));
461 /* This next bit makes the above posting read even more important. We
462 * want to flush the TLBs only after we're certain all the PTE updates
465 I915_WRITE(GFX_FLSH_CNTL_GEN6
, GFX_FLSH_CNTL_EN
);
466 POSTING_READ(GFX_FLSH_CNTL_GEN6
);
469 void i915_gem_gtt_bind_object(struct drm_i915_gem_object
*obj
,
470 enum i915_cache_level cache_level
)
472 struct drm_device
*dev
= obj
->base
.dev
;
473 if (INTEL_INFO(dev
)->gen
< 6) {
474 unsigned int flags
= (cache_level
== I915_CACHE_NONE
) ?
475 AGP_USER_MEMORY
: AGP_USER_CACHED_MEMORY
;
476 intel_gtt_insert_sg_entries(obj
->pages
,
477 obj
->gtt_space
->start
>> PAGE_SHIFT
,
480 gen6_ggtt_bind_object(obj
, cache_level
);
483 obj
->has_global_gtt_mapping
= 1;
486 void i915_gem_gtt_unbind_object(struct drm_i915_gem_object
*obj
)
488 i915_ggtt_clear_range(obj
->base
.dev
,
489 obj
->gtt_space
->start
>> PAGE_SHIFT
,
490 obj
->base
.size
>> PAGE_SHIFT
);
492 obj
->has_global_gtt_mapping
= 0;
495 void i915_gem_gtt_finish_object(struct drm_i915_gem_object
*obj
)
497 struct drm_device
*dev
= obj
->base
.dev
;
498 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
501 interruptible
= do_idling(dev_priv
);
503 if (!obj
->has_dma_mapping
)
504 dma_unmap_sg(&dev
->pdev
->dev
,
505 obj
->pages
->sgl
, obj
->pages
->nents
,
506 PCI_DMA_BIDIRECTIONAL
);
508 undo_idling(dev_priv
, interruptible
);
511 static void i915_gtt_color_adjust(struct drm_mm_node
*node
,
513 unsigned long *start
,
516 if (node
->color
!= color
)
519 if (!list_empty(&node
->node_list
)) {
520 node
= list_entry(node
->node_list
.next
,
523 if (node
->allocated
&& node
->color
!= color
)
528 void i915_gem_init_global_gtt(struct drm_device
*dev
,
530 unsigned long mappable_end
,
533 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
535 /* Substract the guard page ... */
536 drm_mm_init(&dev_priv
->mm
.gtt_space
, start
, end
- start
- PAGE_SIZE
);
538 dev_priv
->mm
.gtt_space
.color_adjust
= i915_gtt_color_adjust
;
540 dev_priv
->mm
.gtt_start
= start
;
541 dev_priv
->mm
.gtt_mappable_end
= mappable_end
;
542 dev_priv
->mm
.gtt_end
= end
;
543 dev_priv
->mm
.gtt_total
= end
- start
;
544 dev_priv
->mm
.mappable_gtt_total
= min(end
, mappable_end
) - start
;
546 /* ... but ensure that we clear the entire range. */
547 i915_ggtt_clear_range(dev
, start
/ PAGE_SIZE
, (end
-start
) / PAGE_SIZE
);
550 static int setup_scratch_page(struct drm_device
*dev
)
552 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
556 page
= alloc_page(GFP_KERNEL
| GFP_DMA32
| __GFP_ZERO
);
560 set_pages_uc(page
, 1);
562 #ifdef CONFIG_INTEL_IOMMU
563 dma_addr
= pci_map_page(dev
->pdev
, page
, 0, PAGE_SIZE
,
564 PCI_DMA_BIDIRECTIONAL
);
565 if (pci_dma_mapping_error(dev
->pdev
, dma_addr
))
568 dma_addr
= page_to_phys(page
);
570 dev_priv
->mm
.gtt
->scratch_page
= page
;
571 dev_priv
->mm
.gtt
->scratch_page_dma
= dma_addr
;
576 static void teardown_scratch_page(struct drm_device
*dev
)
578 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
579 set_pages_wb(dev_priv
->mm
.gtt
->scratch_page
, 1);
580 pci_unmap_page(dev
->pdev
, dev_priv
->mm
.gtt
->scratch_page_dma
,
581 PAGE_SIZE
, PCI_DMA_BIDIRECTIONAL
);
582 put_page(dev_priv
->mm
.gtt
->scratch_page
);
583 __free_page(dev_priv
->mm
.gtt
->scratch_page
);
586 static inline unsigned int gen6_get_total_gtt_size(u16 snb_gmch_ctl
)
588 snb_gmch_ctl
>>= SNB_GMCH_GGMS_SHIFT
;
589 snb_gmch_ctl
&= SNB_GMCH_GGMS_MASK
;
590 return snb_gmch_ctl
<< 20;
593 static inline unsigned int gen6_get_stolen_size(u16 snb_gmch_ctl
)
595 snb_gmch_ctl
>>= SNB_GMCH_GMS_SHIFT
;
596 snb_gmch_ctl
&= SNB_GMCH_GMS_MASK
;
597 return snb_gmch_ctl
<< 25; /* 32 MB units */
600 static inline unsigned int gen7_get_stolen_size(u16 snb_gmch_ctl
)
602 static const int stolen_decoder
[] = {
603 0, 0, 0, 0, 0, 32, 48, 64, 128, 256, 96, 160, 224, 352};
604 snb_gmch_ctl
>>= IVB_GMCH_GMS_SHIFT
;
605 snb_gmch_ctl
&= IVB_GMCH_GMS_MASK
;
606 return stolen_decoder
[snb_gmch_ctl
] << 20;
609 int i915_gem_gtt_init(struct drm_device
*dev
)
611 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
612 phys_addr_t gtt_bus_addr
;
616 /* On modern platforms we need not worry ourself with the legacy
617 * hostbridge query stuff. Skip it entirely
619 if (INTEL_INFO(dev
)->gen
< 6) {
620 ret
= intel_gmch_probe(dev_priv
->bridge_dev
, dev
->pdev
, NULL
);
622 DRM_ERROR("failed to set up gmch\n");
626 dev_priv
->mm
.gtt
= intel_gtt_get();
627 if (!dev_priv
->mm
.gtt
) {
628 DRM_ERROR("Failed to initialize GTT\n");
635 dev_priv
->mm
.gtt
= kzalloc(sizeof(*dev_priv
->mm
.gtt
), GFP_KERNEL
);
636 if (!dev_priv
->mm
.gtt
)
639 if (!pci_set_dma_mask(dev
->pdev
, DMA_BIT_MASK(40)))
640 pci_set_consistent_dma_mask(dev
->pdev
, DMA_BIT_MASK(40));
642 #ifdef CONFIG_INTEL_IOMMU
643 dev_priv
->mm
.gtt
->needs_dmar
= 1;
646 /* For GEN6+ the PTEs for the ggtt live at 2MB + BAR0 */
647 gtt_bus_addr
= pci_resource_start(dev
->pdev
, 0) + (2<<20);
648 dev_priv
->mm
.gtt
->gma_bus_addr
= pci_resource_start(dev
->pdev
, 2);
651 pci_read_config_word(dev
->pdev
, SNB_GMCH_CTRL
, &snb_gmch_ctl
);
652 dev_priv
->mm
.gtt
->gtt_total_entries
=
653 gen6_get_total_gtt_size(snb_gmch_ctl
) / sizeof(gtt_pte_t
);
654 if (INTEL_INFO(dev
)->gen
< 7)
655 dev_priv
->mm
.gtt
->stolen_size
= gen6_get_stolen_size(snb_gmch_ctl
);
657 dev_priv
->mm
.gtt
->stolen_size
= gen7_get_stolen_size(snb_gmch_ctl
);
659 dev_priv
->mm
.gtt
->gtt_mappable_entries
= pci_resource_len(dev
->pdev
, 2) >> PAGE_SHIFT
;
660 /* 64/512MB is the current min/max we actually know of, but this is just a
661 * coarse sanity check.
663 if ((dev_priv
->mm
.gtt
->gtt_mappable_entries
>> 8) < 64 ||
664 dev_priv
->mm
.gtt
->gtt_mappable_entries
> dev_priv
->mm
.gtt
->gtt_total_entries
) {
665 DRM_ERROR("Unknown GMADR entries (%d)\n",
666 dev_priv
->mm
.gtt
->gtt_mappable_entries
);
671 ret
= setup_scratch_page(dev
);
673 DRM_ERROR("Scratch setup failed\n");
677 dev_priv
->mm
.gtt
->gtt
= ioremap_wc(gtt_bus_addr
,
678 dev_priv
->mm
.gtt
->gtt_total_entries
* sizeof(gtt_pte_t
));
679 if (!dev_priv
->mm
.gtt
->gtt
) {
680 DRM_ERROR("Failed to map the gtt page table\n");
681 teardown_scratch_page(dev
);
686 /* GMADR is the PCI aperture used by SW to access tiled GFX surfaces in a linear fashion. */
687 DRM_INFO("Memory usable by graphics device = %dM\n", dev_priv
->mm
.gtt
->gtt_total_entries
>> 8);
688 DRM_DEBUG_DRIVER("GMADR size = %dM\n", dev_priv
->mm
.gtt
->gtt_mappable_entries
>> 8);
689 DRM_DEBUG_DRIVER("GTT stolen size = %dM\n", dev_priv
->mm
.gtt
->stolen_size
>> 20);
694 kfree(dev_priv
->mm
.gtt
);
695 if (INTEL_INFO(dev
)->gen
< 6)
700 void i915_gem_gtt_fini(struct drm_device
*dev
)
702 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
703 iounmap(dev_priv
->mm
.gtt
->gtt
);
704 teardown_scratch_page(dev
);
705 if (INTEL_INFO(dev
)->gen
< 6)
707 kfree(dev_priv
->mm
.gtt
);