1/*	$NetBSD: nouveau_nvkm_core_ramht.c,v 1.3 2021/12/18 23:45:34 riastradh Exp $	*/
2
3/*
4 * Copyright 2012 Red Hat Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 */
24#include <sys/cdefs.h>
25__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_core_ramht.c,v 1.3 2021/12/18 23:45:34 riastradh Exp $");
26
27#include <core/ramht.h>
28#include <core/engine.h>
29#include <core/object.h>
30
31static u32
32nvkm_ramht_hash(struct nvkm_ramht *ramht, int chid, u32 handle)
33{
34	u32 hash = 0;
35
36	while (handle) {
37		hash ^= (handle & ((1 << ramht->bits) - 1));
38		handle >>= ramht->bits;
39	}
40
41	hash ^= chid << (ramht->bits - 4);
42	return hash;
43}
44
45struct nvkm_gpuobj *
46nvkm_ramht_search(struct nvkm_ramht *ramht, int chid, u32 handle)
47{
48	u32 co, ho;
49
50	co = ho = nvkm_ramht_hash(ramht, chid, handle);
51	do {
52		if (ramht->data[co].chid == chid) {
53			if (ramht->data[co].handle == handle)
54				return ramht->data[co].inst;
55		}
56
57		if (++co >= ramht->size)
58			co = 0;
59	} while (co != ho);
60
61	return NULL;
62}
63
64static int
65nvkm_ramht_update(struct nvkm_ramht *ramht, int co, struct nvkm_object *object,
66		  int chid, int addr, u32 handle, u32 context)
67{
68	struct nvkm_ramht_data *data = &ramht->data[co];
69	u64 inst = 0x00000040; /* just non-zero for <=g8x fifo ramht */
70	int ret;
71
72	nvkm_gpuobj_del(&data->inst);
73	data->chid = chid;
74	data->handle = handle;
75
76	if (object) {
77		ret = nvkm_object_bind(object, ramht->parent, 16, &data->inst);
78		if (ret) {
79			if (ret != -ENODEV) {
80				data->chid = -1;
81				return ret;
82			}
83			data->inst = NULL;
84		}
85
86		if (data->inst) {
87			if (ramht->device->card_type >= NV_50)
88				inst = data->inst->node->offset;
89			else
90				inst = data->inst->addr;
91		}
92
93		if (addr < 0) context |= inst << -addr;
94		else          context |= inst >>  addr;
95	}
96
97	nvkm_kmap(ramht->gpuobj);
98	nvkm_wo32(ramht->gpuobj, (co << 3) + 0, handle);
99	nvkm_wo32(ramht->gpuobj, (co << 3) + 4, context);
100	nvkm_done(ramht->gpuobj);
101	return co + 1;
102}
103
104void
105nvkm_ramht_remove(struct nvkm_ramht *ramht, int cookie)
106{
107	if (--cookie >= 0)
108		nvkm_ramht_update(ramht, cookie, NULL, -1, 0, 0, 0);
109}
110
111int
112nvkm_ramht_insert(struct nvkm_ramht *ramht, struct nvkm_object *object,
113		  int chid, int addr, u32 handle, u32 context)
114{
115	u32 co, ho;
116
117	if (nvkm_ramht_search(ramht, chid, handle))
118		return -EEXIST;
119
120	co = ho = nvkm_ramht_hash(ramht, chid, handle);
121	do {
122		if (ramht->data[co].chid < 0) {
123			return nvkm_ramht_update(ramht, co, object, chid,
124						 addr, handle, context);
125		}
126
127		if (++co >= ramht->size)
128			co = 0;
129	} while (co != ho);
130
131	return -ENOSPC;
132}
133
134void
135nvkm_ramht_del(struct nvkm_ramht **pramht)
136{
137	struct nvkm_ramht *ramht = *pramht;
138	if (ramht) {
139		nvkm_gpuobj_del(&ramht->gpuobj);
140		vfree(*pramht);
141		*pramht = NULL;
142	}
143}
144
145int
146nvkm_ramht_new(struct nvkm_device *device, u32 size, u32 align,
147	       struct nvkm_gpuobj *parent, struct nvkm_ramht **pramht)
148{
149	struct nvkm_ramht *ramht;
150	int ret, i;
151
152	if (!(ramht = *pramht = vzalloc(struct_size(ramht, data, (size >> 3)))))
153		return -ENOMEM;
154
155	ramht->device = device;
156	ramht->parent = parent;
157	ramht->size = size >> 3;
158	ramht->bits = order_base_2(ramht->size);
159	for (i = 0; i < ramht->size; i++)
160		ramht->data[i].chid = -1;
161
162	ret = nvkm_gpuobj_new(ramht->device, size, align, true,
163			      ramht->parent, &ramht->gpuobj);
164	if (ret)
165		nvkm_ramht_del(pramht);
166	return ret;
167}
168