1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright © 2019 Intel Corporation
4 */
5
6 #include "intel_memory_region.h"
7 #include "gem/i915_gem_region.h"
8 #include "gem/i915_gem_lmem.h"
9 #include "i915_drv.h"
10
11 void __iomem *
i915_gem_object_lmem_io_map(struct drm_i915_gem_object * obj,unsigned long n,unsigned long size)12 i915_gem_object_lmem_io_map(struct drm_i915_gem_object *obj,
13 unsigned long n,
14 unsigned long size)
15 {
16 resource_size_t offset;
17
18 GEM_BUG_ON(!i915_gem_object_is_contiguous(obj));
19
20 offset = i915_gem_object_get_dma_address(obj, n);
21 offset -= obj->mm.region->region.start;
22
23 return io_mapping_map_wc(&obj->mm.region->iomap, offset, size);
24 }
25
26 /**
27 * i915_gem_object_is_lmem - Whether the object is resident in
28 * lmem
29 * @obj: The object to check.
30 *
31 * Even if an object is allowed to migrate and change memory region,
32 * this function checks whether it will always be present in lmem when
33 * valid *or* if that's not the case, whether it's currently resident in lmem.
34 * For migratable and evictable objects, the latter only makes sense when
35 * the object is locked.
36 *
37 * Return: Whether the object migratable but resident in lmem, or not
38 * migratable and will be present in lmem when valid.
39 */
i915_gem_object_is_lmem(struct drm_i915_gem_object * obj)40 bool i915_gem_object_is_lmem(struct drm_i915_gem_object *obj)
41 {
42 struct intel_memory_region *mr = READ_ONCE(obj->mm.region);
43
44 #ifdef CONFIG_LOCKDEP
45 if (i915_gem_object_migratable(obj) &&
46 i915_gem_object_evictable(obj))
47 assert_object_held(obj);
48 #endif
49 return mr && (mr->type == INTEL_MEMORY_LOCAL ||
50 mr->type == INTEL_MEMORY_STOLEN_LOCAL);
51 }
52
53 /**
54 * __i915_gem_object_is_lmem - Whether the object is resident in
55 * lmem while in the fence signaling critical path.
56 * @obj: The object to check.
57 *
58 * This function is intended to be called from within the fence signaling
59 * path where the fence keeps the object from being migrated. For example
60 * during gpu reset or similar.
61 *
62 * Return: Whether the object is resident in lmem.
63 */
__i915_gem_object_is_lmem(struct drm_i915_gem_object * obj)64 bool __i915_gem_object_is_lmem(struct drm_i915_gem_object *obj)
65 {
66 struct intel_memory_region *mr = READ_ONCE(obj->mm.region);
67
68 #ifdef CONFIG_LOCKDEP
69 GEM_WARN_ON(dma_resv_test_signaled(obj->base.resv, true));
70 #endif
71 return mr && (mr->type == INTEL_MEMORY_LOCAL ||
72 mr->type == INTEL_MEMORY_STOLEN_LOCAL);
73 }
74
75 /**
76 * __i915_gem_object_create_lmem_with_ps - Create lmem object and force the
77 * minimum page size for the backing pages.
78 * @i915: The i915 instance.
79 * @size: The size in bytes for the object. Note that we need to round the size
80 * up depending on the @page_size. The final object size can be fished out from
81 * the drm GEM object.
82 * @page_size: The requested minimum page size in bytes for this object. This is
83 * useful if we need something bigger than the regions min_page_size due to some
84 * hw restriction, or in some very specialised cases where it needs to be
85 * smaller, where the internal fragmentation cost is too great when rounding up
86 * the object size.
87 * @flags: The optional BO allocation flags.
88 *
89 * Note that this interface assumes you know what you are doing when forcing the
90 * @page_size. If this is smaller than the regions min_page_size then it can
91 * never be inserted into any GTT, otherwise it might lead to undefined
92 * behaviour.
93 *
94 * Return: The object pointer, which might be an ERR_PTR in the case of failure.
95 */
96 struct drm_i915_gem_object *
__i915_gem_object_create_lmem_with_ps(struct drm_i915_private * i915,resource_size_t size,resource_size_t page_size,unsigned int flags)97 __i915_gem_object_create_lmem_with_ps(struct drm_i915_private *i915,
98 resource_size_t size,
99 resource_size_t page_size,
100 unsigned int flags)
101 {
102 return i915_gem_object_create_region(i915->mm.regions[INTEL_REGION_LMEM],
103 size, page_size, flags);
104 }
105
106 struct drm_i915_gem_object *
i915_gem_object_create_lmem(struct drm_i915_private * i915,resource_size_t size,unsigned int flags)107 i915_gem_object_create_lmem(struct drm_i915_private *i915,
108 resource_size_t size,
109 unsigned int flags)
110 {
111 return i915_gem_object_create_region(i915->mm.regions[INTEL_REGION_LMEM],
112 size, 0, flags);
113 }
114