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 mutex_unlock(&fb->subdev.mutex); 95 *ptags = tags; 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