1 /*
2 * Copyright 2015 Red Hat Inc.
3 *
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:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: Ben Skeggs <bskeggs@redhat.com>
23 */
24 #include <core/memory.h>
25 #include <core/mm.h>
26 #include <subdev/fb.h>
27 #include <subdev/instmem.h>
28
29 void
nvkm_memory_tags_put(struct nvkm_memory * memory,struct nvkm_device * device,struct nvkm_tags ** ptags)30 nvkm_memory_tags_put(struct nvkm_memory *memory, struct nvkm_device *device,
31 struct nvkm_tags **ptags)
32 {
33 struct nvkm_fb *fb = device->fb;
34 struct nvkm_tags *tags = *ptags;
35 if (tags) {
36 mutex_lock(&fb->subdev.mutex);
37 if (refcount_dec_and_test(&tags->refcount)) {
38 nvkm_mm_free(&fb->tags, &tags->mn);
39 kfree(memory->tags);
40 memory->tags = NULL;
41 }
42 mutex_unlock(&fb->subdev.mutex);
43 *ptags = NULL;
44 }
45 }
46
47 int
nvkm_memory_tags_get(struct nvkm_memory * memory,struct nvkm_device * device,u32 nr,void (* clr)(struct nvkm_device *,u32,u32),struct nvkm_tags ** ptags)48 nvkm_memory_tags_get(struct nvkm_memory *memory, struct nvkm_device *device,
49 u32 nr, void (*clr)(struct nvkm_device *, u32, u32),
50 struct nvkm_tags **ptags)
51 {
52 struct nvkm_fb *fb = device->fb;
53 struct nvkm_tags *tags;
54
55 mutex_lock(&fb->subdev.mutex);
56 if ((tags = memory->tags)) {
57 /* If comptags exist for the memory, but a different amount
58 * than requested, the buffer is being mapped with settings
59 * that are incompatible with existing mappings.
60 */
61 if (tags->mn && tags->mn->length != nr) {
62 mutex_unlock(&fb->subdev.mutex);
63 return -EINVAL;
64 }
65
66 refcount_inc(&tags->refcount);
67 mutex_unlock(&fb->subdev.mutex);
68 *ptags = tags;
69 return 0;
70 }
71
72 if (!(tags = kmalloc(sizeof(*tags), GFP_KERNEL))) {
73 mutex_unlock(&fb->subdev.mutex);
74 return -ENOMEM;
75 }
76
77 if (!nvkm_mm_head(&fb->tags, 0, 1, nr, nr, 1, &tags->mn)) {
78 if (clr)
79 clr(device, tags->mn->offset, tags->mn->length);
80 } else {
81 /* Failure to allocate HW comptags is not an error, the
82 * caller should fall back to an uncompressed map.
83 *
84 * As memory can be mapped in multiple places, we still
85 * need to track the allocation failure and ensure that
86 * any additional mappings remain uncompressed.
87 *
88 * This is handled by returning an empty nvkm_tags.
89 */
90 tags->mn = NULL;
91 }
92
93 refcount_set(&tags->refcount, 1);
94 mutex_unlock(&fb->subdev.mutex);
95 *ptags = tags;
96 return 0;
97 }
98
99 void
nvkm_memory_ctor(const struct nvkm_memory_func * func,struct nvkm_memory * memory)100 nvkm_memory_ctor(const struct nvkm_memory_func *func,
101 struct nvkm_memory *memory)
102 {
103 memory->func = func;
104 kref_init(&memory->kref);
105 }
106
107 static void
nvkm_memory_del(struct kref * kref)108 nvkm_memory_del(struct kref *kref)
109 {
110 struct nvkm_memory *memory = container_of(kref, typeof(*memory), kref);
111 if (!WARN_ON(!memory->func)) {
112 if (memory->func->dtor)
113 memory = memory->func->dtor(memory);
114 kfree(memory);
115 }
116 }
117
118 void
nvkm_memory_unref(struct nvkm_memory ** pmemory)119 nvkm_memory_unref(struct nvkm_memory **pmemory)
120 {
121 struct nvkm_memory *memory = *pmemory;
122 if (memory) {
123 kref_put(&memory->kref, nvkm_memory_del);
124 *pmemory = NULL;
125 }
126 }
127
128 struct nvkm_memory *
nvkm_memory_ref(struct nvkm_memory * memory)129 nvkm_memory_ref(struct nvkm_memory *memory)
130 {
131 if (memory)
132 kref_get(&memory->kref);
133 return memory;
134 }
135
136 int
nvkm_memory_new(struct nvkm_device * device,enum nvkm_memory_target target,u64 size,u32 align,bool zero,struct nvkm_memory ** pmemory)137 nvkm_memory_new(struct nvkm_device *device, enum nvkm_memory_target target,
138 u64 size, u32 align, bool zero,
139 struct nvkm_memory **pmemory)
140 {
141 struct nvkm_instmem *imem = device->imem;
142 struct nvkm_memory *memory;
143 int ret = -ENOSYS;
144
145 if (unlikely(target != NVKM_MEM_TARGET_INST || !imem))
146 return -ENOSYS;
147
148 ret = nvkm_instobj_new(imem, size, align, zero, &memory);
149 if (ret)
150 return ret;
151
152 *pmemory = memory;
153 return 0;
154 }
155
