root/drivers/gpu/drm/nouveau/nvkm/core/memory.c

DEFINITIONS

1. nvkm_memory_tags_put
2. nvkm_memory_tags_get
3. nvkm_memory_ctor
4. nvkm_memory_del
5. nvkm_memory_unref
6. nvkm_memory_ref
7. nvkm_memory_new

   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 }