2 * Copyright © 2014-2016 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
26 #include <drm/i915_drm.h>
29 #define QUIET (__GFP_NORETRY | __GFP_NOWARN)
31 /* convert swiotlb segment size into sensible units (pages)! */
32 #define IO_TLB_SEGPAGES (IO_TLB_SEGSIZE << IO_TLB_SHIFT >> PAGE_SHIFT)
34 static void internal_free_pages(struct sg_table
*st
)
36 struct scatterlist
*sg
;
38 for (sg
= st
->sgl
; sg
; sg
= __sg_next(sg
)) {
40 __free_pages(sg_page(sg
), get_order(sg
->length
));
47 static int i915_gem_object_get_pages_internal(struct drm_i915_gem_object
*obj
)
49 struct drm_i915_private
*i915
= to_i915(obj
->base
.dev
);
51 struct scatterlist
*sg
;
52 unsigned int sg_page_sizes
;
57 max_order
= MAX_ORDER
;
59 if (swiotlb_nr_tbl()) {
60 unsigned int max_segment
;
62 max_segment
= swiotlb_max_segment();
64 max_segment
= max_t(unsigned int, max_segment
,
65 PAGE_SIZE
) >> PAGE_SHIFT
;
66 max_order
= min(max_order
, ilog2(max_segment
));
71 gfp
= GFP_KERNEL
| __GFP_HIGHMEM
| __GFP_RECLAIMABLE
;
72 if (IS_I965GM(i915
) || IS_I965G(i915
)) {
73 /* 965gm cannot relocate objects above 4GiB. */
74 gfp
&= ~__GFP_HIGHMEM
;
79 st
= kmalloc(sizeof(*st
), GFP_KERNEL
);
83 npages
= obj
->base
.size
/ PAGE_SIZE
;
84 if (sg_alloc_table(st
, npages
, GFP_KERNEL
)) {
94 int order
= min(fls(npages
) - 1, max_order
);
98 page
= alloc_pages(gfp
| (order
? QUIET
: 0), order
);
104 /* Limit subsequent allocations as well */
108 sg_set_page(sg
, page
, PAGE_SIZE
<< order
, 0);
109 sg_page_sizes
|= PAGE_SIZE
<< order
;
112 npages
-= 1 << order
;
121 if (i915_gem_gtt_prepare_pages(obj
, st
)) {
122 /* Failed to dma-map try again with single page sg segments */
123 if (get_order(st
->sgl
->length
)) {
124 internal_free_pages(st
);
131 /* Mark the pages as dontneed whilst they are still pinned. As soon
132 * as they are unpinned they are allowed to be reaped by the shrinker,
133 * and the caller is expected to repopulate - the contents of this
134 * object are only valid whilst active and pinned.
136 obj
->mm
.madv
= I915_MADV_DONTNEED
;
138 __i915_gem_object_set_pages(obj
, st
, sg_page_sizes
);
143 sg_set_page(sg
, NULL
, 0, 0);
145 internal_free_pages(st
);
150 static void i915_gem_object_put_pages_internal(struct drm_i915_gem_object
*obj
,
151 struct sg_table
*pages
)
153 i915_gem_gtt_finish_pages(obj
, pages
);
154 internal_free_pages(pages
);
156 obj
->mm
.dirty
= false;
157 obj
->mm
.madv
= I915_MADV_WILLNEED
;
160 static const struct drm_i915_gem_object_ops i915_gem_object_internal_ops
= {
161 .flags
= I915_GEM_OBJECT_HAS_STRUCT_PAGE
|
162 I915_GEM_OBJECT_IS_SHRINKABLE
,
163 .get_pages
= i915_gem_object_get_pages_internal
,
164 .put_pages
= i915_gem_object_put_pages_internal
,
168 * Creates a new object that wraps some internal memory for private use.
169 * This object is not backed by swappable storage, and as such its contents
170 * are volatile and only valid whilst pinned. If the object is reaped by the
171 * shrinker, its pages and data will be discarded. Equally, it is not a full
172 * GEM object and so not valid for access from userspace. This makes it useful
173 * for hardware interfaces like ringbuffers (which are pinned from the time
174 * the request is written to the time the hardware stops accessing it), but
175 * not for contexts (which need to be preserved when not active for later
176 * reuse). Note that it is not cleared upon allocation.
178 struct drm_i915_gem_object
*
179 i915_gem_object_create_internal(struct drm_i915_private
*i915
,
182 struct drm_i915_gem_object
*obj
;
183 unsigned int cache_level
;
186 GEM_BUG_ON(!IS_ALIGNED(size
, PAGE_SIZE
));
188 if (overflows_type(size
, obj
->base
.size
))
189 return ERR_PTR(-E2BIG
);
191 obj
= i915_gem_object_alloc(i915
);
193 return ERR_PTR(-ENOMEM
);
195 drm_gem_private_object_init(&i915
->drm
, &obj
->base
, size
);
196 i915_gem_object_init(obj
, &i915_gem_object_internal_ops
);
198 obj
->base
.read_domains
= I915_GEM_DOMAIN_CPU
;
199 obj
->base
.write_domain
= I915_GEM_DOMAIN_CPU
;
201 cache_level
= HAS_LLC(i915
) ? I915_CACHE_LLC
: I915_CACHE_NONE
;
202 i915_gem_object_set_cache_coherency(obj
, cache_level
);