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
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
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 	*ptags = memory->tags = tags;
95 	mutex_unlock(&fb->subdev.mutex);
96 	return 0;
97 }
98 
99 void
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
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
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 *
129 nvkm_memory_ref(struct nvkm_memory *memory)
130 {
131 	if (memory)
132 		kref_get(&memory->kref);
133 	return memory;
134 }
135 
136 int
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