1 /* $NetBSD: nouveau_nvkm_core_memory.c,v 1.3 2021/12/18 23:45:34 riastradh Exp $ */
2
3 /*
4 * Copyright 2015 Red Hat Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors: Ben Skeggs <bskeggs@redhat.com>
25 */
26 #include <sys/cdefs.h>
27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_core_memory.c,v 1.3 2021/12/18 23:45:34 riastradh Exp $");
28
29 #include <core/memory.h>
30 #include <core/mm.h>
31 #include <subdev/fb.h>
32 #include <subdev/instmem.h>
33
34 void
nvkm_memory_tags_put(struct nvkm_memory * memory,struct nvkm_device * device,struct nvkm_tags ** ptags)35 nvkm_memory_tags_put(struct nvkm_memory *memory, struct nvkm_device *device,
36 struct nvkm_tags **ptags)
37 {
38 struct nvkm_fb *fb = device->fb;
39 struct nvkm_tags *tags = *ptags;
40 if (tags) {
41 mutex_lock(&fb->subdev.mutex);
42 if (refcount_dec_and_test(&tags->refcount)) {
43 nvkm_mm_free(&fb->tags, &tags->mn);
44 kfree(memory->tags);
45 memory->tags = NULL;
46 }
47 mutex_unlock(&fb->subdev.mutex);
48 *ptags = NULL;
49 }
50 }
51
52 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)53 nvkm_memory_tags_get(struct nvkm_memory *memory, struct nvkm_device *device,
54 u32 nr, void (*clr)(struct nvkm_device *, u32, u32),
55 struct nvkm_tags **ptags)
56 {
57 struct nvkm_fb *fb = device->fb;
58 struct nvkm_tags *tags;
59
60 mutex_lock(&fb->subdev.mutex);
61 if ((tags = memory->tags)) {
62 /* If comptags exist for the memory, but a different amount
63 * than requested, the buffer is being mapped with settings
64 * that are incompatible with existing mappings.
65 */
66 if (tags->mn && tags->mn->length != nr) {
67 mutex_unlock(&fb->subdev.mutex);
68 return -EINVAL;
69 }
70
71 refcount_inc(&tags->refcount);
72 mutex_unlock(&fb->subdev.mutex);
73 *ptags = tags;
74 return 0;
75 }
76
77 if (!(tags = kmalloc(sizeof(*tags), GFP_KERNEL))) {
78 mutex_unlock(&fb->subdev.mutex);
79 return -ENOMEM;
80 }
81
82 if (!nvkm_mm_head(&fb->tags, 0, 1, nr, nr, 1, &tags->mn)) {
83 if (clr)
84 clr(device, tags->mn->offset, tags->mn->length);
85 } else {
86 /* Failure to allocate HW comptags is not an error, the
87 * caller should fall back to an uncompressed map.
88 *
89 * As memory can be mapped in multiple places, we still
90 * need to track the allocation failure and ensure that
91 * any additional mappings remain uncompressed.
92 *
93 * This is handled by returning an empty nvkm_tags.
94 */
95 tags->mn = NULL;
96 }
97
98 refcount_set(&tags->refcount, 1);
99 *ptags = memory->tags = tags;
100 mutex_unlock(&fb->subdev.mutex);
101 return 0;
102 }
103
104 void
nvkm_memory_ctor(const struct nvkm_memory_func * func,struct nvkm_memory * memory)105 nvkm_memory_ctor(const struct nvkm_memory_func *func,
106 struct nvkm_memory *memory)
107 {
108 memory->func = func;
109 kref_init(&memory->kref);
110 }
111
112 static void
nvkm_memory_del(struct kref * kref)113 nvkm_memory_del(struct kref *kref)
114 {
115 struct nvkm_memory *memory = container_of(kref, typeof(*memory), kref);
116 if (!WARN_ON(!memory->func)) {
117 if (memory->func->dtor)
118 memory = memory->func->dtor(memory);
119 kfree(memory);
120 }
121 }
122
123 void
nvkm_memory_unref(struct nvkm_memory ** pmemory)124 nvkm_memory_unref(struct nvkm_memory **pmemory)
125 {
126 struct nvkm_memory *memory = *pmemory;
127 if (memory) {
128 kref_put(&memory->kref, nvkm_memory_del);
129 *pmemory = NULL;
130 }
131 }
132
133 struct nvkm_memory *
nvkm_memory_ref(struct nvkm_memory * memory)134 nvkm_memory_ref(struct nvkm_memory *memory)
135 {
136 if (memory)
137 kref_get(&memory->kref);
138 return memory;
139 }
140
141 int
nvkm_memory_new(struct nvkm_device * device,enum nvkm_memory_target target,u64 size,u32 align,bool zero,struct nvkm_memory ** pmemory)142 nvkm_memory_new(struct nvkm_device *device, enum nvkm_memory_target target,
143 u64 size, u32 align, bool zero,
144 struct nvkm_memory **pmemory)
145 {
146 struct nvkm_instmem *imem = device->imem;
147 struct nvkm_memory *memory;
148 int ret = -ENOSYS;
149
150 if (unlikely(target != NVKM_MEM_TARGET_INST || !imem))
151 return -ENOSYS;
152
153 ret = nvkm_instobj_new(imem, size, align, zero, &memory);
154 if (ret)
155 return ret;
156
157 *pmemory = memory;
158 return 0;
159 }
160