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 static int
  32 nvkm_dma_oclass_new(struct nvkm_device *device,
  33                     const struct nvkm_oclass *oclass, void *data, u32 size,
  34                     struct nvkm_object **pobject)
  35 {
  36         struct nvkm_dma *dma = nvkm_dma(oclass->engine);
  37         struct nvkm_dmaobj *dmaobj = NULL;
  38         int ret;
  39
  40         ret = dma->func->class_new(dma, oclass, data, size, &dmaobj);
  41         if (dmaobj)
  42                 *pobject = &dmaobj->object;
  43         return ret;
  44 }
  45
  46 static const struct nvkm_device_oclass
  47 nvkm_dma_oclass_base = {
  48         .ctor = nvkm_dma_oclass_new,
  49 };
  50
  51 static int
  52 nvkm_dma_oclass_fifo_new(const struct nvkm_oclass *oclass, void *data, u32 size,
  53                          struct nvkm_object **pobject)
  54 {
  55         return nvkm_dma_oclass_new(oclass->engine->subdev.device,
  56                                    oclass, data, size, pobject);
  57 }
  58
  59 static const struct nvkm_sclass
  60 nvkm_dma_sclass[] = {
  61         { 0, 0, NV_DMA_FROM_MEMORY, NULL, nvkm_dma_oclass_fifo_new },
  62         { 0, 0, NV_DMA_TO_MEMORY, NULL, nvkm_dma_oclass_fifo_new },
  63         { 0, 0, NV_DMA_IN_MEMORY, NULL, nvkm_dma_oclass_fifo_new },
  64 };
  65
  66 static int
  67 nvkm_dma_oclass_base_get(struct nvkm_oclass *sclass, int index,
  68                          const struct nvkm_device_oclass **class)
  69 {
  70         const int count = ARRAY_SIZE(nvkm_dma_sclass);
  71         if (index < count) {
  72                 const struct nvkm_sclass *oclass = &nvkm_dma_sclass[index];
  73                 sclass->base = oclass[0];
  74                 sclass->engn = oclass;
  75                 *class = &nvkm_dma_oclass_base;
  76                 return index;
  77         }
  78         return count;
  79 }
  80
  81 static int
  82 nvkm_dma_oclass_fifo_get(struct nvkm_oclass *oclass, int index)
  83 {
  84         const int count = ARRAY_SIZE(nvkm_dma_sclass);
  85         if (index < count) {
  86                 oclass->base = nvkm_dma_sclass[index];
  87                 return index;
  88         }
  89         return count;
  90 }
  91
  92 static void *
  93 nvkm_dma_dtor(struct nvkm_engine *engine)
  94 {
  95         return nvkm_dma(engine);
  96 }
  97
  98 static const struct nvkm_engine_func
  99 nvkm_dma = {
 100         .dtor = nvkm_dma_dtor,
 101         .base.sclass = nvkm_dma_oclass_base_get,
 102         .fifo.sclass = nvkm_dma_oclass_fifo_get,
 103 };
 104
 105 int
 106 nvkm_dma_new_(const struct nvkm_dma_func *func, struct nvkm_device *device,
 107               int index, struct nvkm_dma **pdma)
 108 {
 109         struct nvkm_dma *dma;
 110
 111         if (!(dma = *pdma = kzalloc(sizeof(*dma), GFP_KERNEL)))
 112                 return -ENOMEM;
 113         dma->func = func;
 114
 115         return nvkm_engine_ctor(&nvkm_dma, device, index, true, &dma->engine);
 116 }