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 <core/gpuobj.h>
25#include <core/engine.h>
26
27#include <subdev/instmem.h>
28#include <subdev/bar.h>
29#include <subdev/mmu.h>
30
31/* fast-path, where backend is able to provide direct pointer to memory */
32static u32
33nvkm_gpuobj_rd32_fast(struct nvkm_gpuobj *gpuobj, u32 offset)
34{
35	return ioread32_native(gpuobj->map + offset);
36}
37
38static void
39nvkm_gpuobj_wr32_fast(struct nvkm_gpuobj *gpuobj, u32 offset, u32 data)
40{
41	iowrite32_native(data, gpuobj->map + offset);
42}
43
44/* accessor functions for gpuobjs allocated directly from instmem */
45static u32
46nvkm_gpuobj_heap_rd32(struct nvkm_gpuobj *gpuobj, u32 offset)
47{
48	return nvkm_ro32(gpuobj->memory, offset);
49}
50
51static void
52nvkm_gpuobj_heap_wr32(struct nvkm_gpuobj *gpuobj, u32 offset, u32 data)
53{
54	nvkm_wo32(gpuobj->memory, offset, data);
55}
56
57static const struct nvkm_gpuobj_func nvkm_gpuobj_heap;
58static void
59nvkm_gpuobj_heap_release(struct nvkm_gpuobj *gpuobj)
60{
61	gpuobj->func = &nvkm_gpuobj_heap;
62	nvkm_done(gpuobj->memory);
63}
64
65static const struct nvkm_gpuobj_func
66nvkm_gpuobj_heap_fast = {
67	.release = nvkm_gpuobj_heap_release,
68	.rd32 = nvkm_gpuobj_rd32_fast,
69	.wr32 = nvkm_gpuobj_wr32_fast,
70};
71
72static const struct nvkm_gpuobj_func
73nvkm_gpuobj_heap_slow = {
74	.release = nvkm_gpuobj_heap_release,
75	.rd32 = nvkm_gpuobj_heap_rd32,
76	.wr32 = nvkm_gpuobj_heap_wr32,
77};
78
79static void *
80nvkm_gpuobj_heap_acquire(struct nvkm_gpuobj *gpuobj)
81{
82	gpuobj->map = nvkm_kmap(gpuobj->memory);
83	if (likely(gpuobj->map))
84		gpuobj->func = &nvkm_gpuobj_heap_fast;
85	else
86		gpuobj->func = &nvkm_gpuobj_heap_slow;
87	return gpuobj->map;
88}
89
90static const struct nvkm_gpuobj_func
91nvkm_gpuobj_heap = {
92	.acquire = nvkm_gpuobj_heap_acquire,
93};
94
95/* accessor functions for gpuobjs sub-allocated from a parent gpuobj */
96static u32
97nvkm_gpuobj_rd32(struct nvkm_gpuobj *gpuobj, u32 offset)
98{
99	return nvkm_ro32(gpuobj->parent, gpuobj->node->offset + offset);
100}
101
102static void
103nvkm_gpuobj_wr32(struct nvkm_gpuobj *gpuobj, u32 offset, u32 data)
104{
105	nvkm_wo32(gpuobj->parent, gpuobj->node->offset + offset, data);
106}
107
108static const struct nvkm_gpuobj_func nvkm_gpuobj_func;
109static void
110nvkm_gpuobj_release(struct nvkm_gpuobj *gpuobj)
111{
112	gpuobj->func = &nvkm_gpuobj_func;
113	nvkm_done(gpuobj->parent);
114}
115
116static const struct nvkm_gpuobj_func
117nvkm_gpuobj_fast = {
118	.release = nvkm_gpuobj_release,
119	.rd32 = nvkm_gpuobj_rd32_fast,
120	.wr32 = nvkm_gpuobj_wr32_fast,
121};
122
123static const struct nvkm_gpuobj_func
124nvkm_gpuobj_slow = {
125	.release = nvkm_gpuobj_release,
126	.rd32 = nvkm_gpuobj_rd32,
127	.wr32 = nvkm_gpuobj_wr32,
128};
129
130static void *
131nvkm_gpuobj_acquire(struct nvkm_gpuobj *gpuobj)
132{
133	gpuobj->map = nvkm_kmap(gpuobj->parent);
134	if (likely(gpuobj->map)) {
135		gpuobj->map  = (u8 *)gpuobj->map + gpuobj->node->offset;
136		gpuobj->func = &nvkm_gpuobj_fast;
137	} else {
138		gpuobj->func = &nvkm_gpuobj_slow;
139	}
140	return gpuobj->map;
141}
142
143static const struct nvkm_gpuobj_func
144nvkm_gpuobj_func = {
145	.acquire = nvkm_gpuobj_acquire,
146};
147
148static int
149nvkm_gpuobj_ctor(struct nvkm_device *device, u32 size, int align, bool zero,
150		 struct nvkm_gpuobj *parent, struct nvkm_gpuobj *gpuobj)
151{
152	u32 offset;
153	int ret;
154
155	if (parent) {
156		if (align >= 0) {
157			ret = nvkm_mm_head(&parent->heap, 0, 1, size, size,
158					   max(align, 1), &gpuobj->node);
159		} else {
160			ret = nvkm_mm_tail(&parent->heap, 0, 1, size, size,
161					   -align, &gpuobj->node);
162		}
163		if (ret)
164			return ret;
165
166		gpuobj->parent = parent;
167		gpuobj->func = &nvkm_gpuobj_func;
168		gpuobj->addr = parent->addr + gpuobj->node->offset;
169		gpuobj->size = gpuobj->node->length;
170
171		if (zero) {
172			nvkm_kmap(gpuobj);
173			for (offset = 0; offset < gpuobj->size; offset += 4)
174				nvkm_wo32(gpuobj, offset, 0x00000000);
175			nvkm_done(gpuobj);
176		}
177	} else {
178		ret = nvkm_memory_new(device, NVKM_MEM_TARGET_INST, size,
179				      abs(align), zero, &gpuobj->memory);
180		if (ret)
181			return ret;
182
183		gpuobj->func = &nvkm_gpuobj_heap;
184		gpuobj->addr = nvkm_memory_addr(gpuobj->memory);
185		gpuobj->size = nvkm_memory_size(gpuobj->memory);
186	}
187
188	return nvkm_mm_init(&gpuobj->heap, 0, gpuobj->size, 1);
189}
190
191void
192nvkm_gpuobj_del(struct nvkm_gpuobj **pgpuobj)
193{
194	struct nvkm_gpuobj *gpuobj = *pgpuobj;
195	if (gpuobj) {
196		if (gpuobj->parent)
197			nvkm_mm_free(&gpuobj->parent->heap, &gpuobj->node);
198		nvkm_mm_fini(&gpuobj->heap);
199		nvkm_memory_del(&gpuobj->memory);
200		kfree(*pgpuobj);
201		*pgpuobj = NULL;
202	}
203}
204
205int
206nvkm_gpuobj_new(struct nvkm_device *device, u32 size, int align, bool zero,
207		struct nvkm_gpuobj *parent, struct nvkm_gpuobj **pgpuobj)
208{
209	struct nvkm_gpuobj *gpuobj;
210	int ret;
211
212	if (!(gpuobj = *pgpuobj = kzalloc(sizeof(*gpuobj), GFP_KERNEL)))
213		return -ENOMEM;
214
215	ret = nvkm_gpuobj_ctor(device, size, align, zero, parent, gpuobj);
216	if (ret)
217		nvkm_gpuobj_del(pgpuobj);
218	return ret;
219}
220
221int
222nvkm_gpuobj_map(struct nvkm_gpuobj *gpuobj, struct nvkm_vm *vm,
223		u32 access, struct nvkm_vma *vma)
224{
225	struct nvkm_memory *memory = gpuobj->memory;
226	int ret = nvkm_vm_get(vm, gpuobj->size, 12, access, vma);
227	if (ret == 0)
228		nvkm_memory_map(memory, vma, 0);
229	return ret;
230}
231
232void
233nvkm_gpuobj_unmap(struct nvkm_vma *vma)
234{
235	if (vma->node) {
236		nvkm_vm_unmap(vma);
237		nvkm_vm_put(vma);
238	}
239}
240
241/* the below is basically only here to support sharing the paged dma object
242 * for PCI(E)GART on <=nv4x chipsets, and should *not* be expected to work
243 * anywhere else.
244 */
245
246int
247nvkm_gpuobj_wrap(struct nvkm_memory *memory, struct nvkm_gpuobj **pgpuobj)
248{
249	if (!(*pgpuobj = kzalloc(sizeof(**pgpuobj), GFP_KERNEL)))
250		return -ENOMEM;
251
252	(*pgpuobj)->addr = nvkm_memory_addr(memory);
253	(*pgpuobj)->size = nvkm_memory_size(memory);
254	return 0;
255}
256