kernel/drivers/gpu/drm/nouveau/nvkm/engine/dma/base.c

   1 /*
   2  * Copyright 2012 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
  23  */
  24 #include "priv.h"
  25
  26 #include <core/client.h>
  27 #include <engine/fifo.h>
  28
  29 #include <nvif/class.h>
  30
  31 struct nvkm_dmaobj *
  32 nvkm_dma_search(struct nvkm_dma *dma, struct nvkm_client *client, u64 object)
  33 {
  34         struct rb_node *node = client->dmaroot.rb_node;
  35         while (node) {
  36                 struct nvkm_dmaobj *dmaobj =
  37                         container_of(node, typeof(*dmaobj), rb);
  38                 if (object < dmaobj->handle)
  39                         node = node->rb_left;
  40                 else
  41                 if (object > dmaobj->handle)
  42                         node = node->rb_right;
  43                 else
  44                         return dmaobj;
  45         }
  46         return NULL;
  47 }
  48
  49 static int
  50 nvkm_dma_oclass_new(struct nvkm_device *device,
  51                     const struct nvkm_oclass *oclass, void *data, u32 size,
  52                     struct nvkm_object **pobject)
  53 {
  54         struct nvkm_dma *dma = nvkm_dma(oclass->engine);
  55         struct nvkm_dmaobj *dmaobj = NULL;
  56         struct nvkm_client *client = oclass->client;
  57         struct rb_node **ptr = &client->dmaroot.rb_node;
  58         struct rb_node *parent = NULL;
  59         int ret;
  60
  61         ret = dma->func->class_new(dma, oclass, data, size, &dmaobj);
  62         if (dmaobj)
  63                 *pobject = &dmaobj->object;
  64         if (ret)
  65                 return ret;
  66
  67         dmaobj->handle = oclass->object;
  68
  69         while (*ptr) {
  70                 struct nvkm_dmaobj *obj = container_of(*ptr, typeof(*obj), rb);
  71                 parent = *ptr;
  72                 if (dmaobj->handle < obj->handle)
  73                         ptr = &parent->rb_left;
  74                 else
  75                 if (dmaobj->handle > obj->handle)
  76                         ptr = &parent->rb_right;
  77                 else
  78                         return -EEXIST;
  79         }
  80
  81         rb_link_node(&dmaobj->rb, parent, ptr);
  82         rb_insert_color(&dmaobj->rb, &client->dmaroot);
  83         return 0;
  84 }
  85
  86 static const struct nvkm_device_oclass
  87 nvkm_dma_oclass_base = {
  88         .ctor = nvkm_dma_oclass_new,
  89 };
  90
  91 static int
  92 nvkm_dma_oclass_fifo_new(const struct nvkm_oclass *oclass, void *data, u32 size,
  93                          struct nvkm_object **pobject)
  94 {
  95         return nvkm_dma_oclass_new(oclass->engine->subdev.device,
  96                                    oclass, data, size, pobject);
  97 }
  98
  99 static const struct nvkm_sclass
 100 nvkm_dma_sclass[] = {
 101         { 0, 0, NV_DMA_FROM_MEMORY, NULL, nvkm_dma_oclass_fifo_new },
 102         { 0, 0, NV_DMA_TO_MEMORY, NULL, nvkm_dma_oclass_fifo_new },
 103         { 0, 0, NV_DMA_IN_MEMORY, NULL, nvkm_dma_oclass_fifo_new },
 104 };
 105
 106 static int
 107 nvkm_dma_oclass_base_get(struct nvkm_oclass *sclass, int index,
 108                          const struct nvkm_device_oclass **class)
 109 {
 110         const int count = ARRAY_SIZE(nvkm_dma_sclass);
 111         if (index < count) {
 112                 const struct nvkm_sclass *oclass = &nvkm_dma_sclass[index];
 113                 sclass->base = oclass[0];
 114                 sclass->engn = oclass;
 115                 *class = &nvkm_dma_oclass_base;
 116                 return index;
 117         }
 118         return count;
 119 }
 120
 121 static int
 122 nvkm_dma_oclass_fifo_get(struct nvkm_oclass *oclass, int index)
 123 {
 124         const int count = ARRAY_SIZE(nvkm_dma_sclass);
 125         if (index < count) {
 126                 oclass->base = nvkm_dma_sclass[index];
 127                 return index;
 128         }
 129         return count;
 130 }
 131
 132 static void *
 133 nvkm_dma_dtor(struct nvkm_engine *engine)
 134 {
 135         return nvkm_dma(engine);
 136 }
 137
 138 static const struct nvkm_engine_func
 139 nvkm_dma = {
 140         .dtor = nvkm_dma_dtor,
 141         .base.sclass = nvkm_dma_oclass_base_get,
 142         .fifo.sclass = nvkm_dma_oclass_fifo_get,
 143 };
 144
 145 int
 146 nvkm_dma_new_(const struct nvkm_dma_func *func, struct nvkm_device *device,
 147               int index, struct nvkm_dma **pdma)
 148 {
 149         struct nvkm_dma *dma;
 150
 151         if (!(dma = *pdma = kzalloc(sizeof(*dma), GFP_KERNEL)))
 152                 return -ENOMEM;
 153         dma->func = func;
 154
 155         return nvkm_engine_ctor(&nvkm_dma, device, index,
 156                                 0, true, &dma->engine);
 157 }