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
31struct nvkm_dmaobj *
32nvkm_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
49static int
50nvkm_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
86static const struct nvkm_device_oclass
87nvkm_dma_oclass_base = {
88	.ctor = nvkm_dma_oclass_new,
89};
90
91static int
92nvkm_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
99static const struct nvkm_sclass
100nvkm_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
106static int
107nvkm_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
121static int
122nvkm_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
132static void *
133nvkm_dma_dtor(struct nvkm_engine *engine)
134{
135	return nvkm_dma(engine);
136}
137
138static const struct nvkm_engine_func
139nvkm_dma = {
140	.dtor = nvkm_dma_dtor,
141	.base.sclass = nvkm_dma_oclass_base_get,
142	.fifo.sclass = nvkm_dma_oclass_fifo_get,
143};
144
145int
146nvkm_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}
158