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 int
46nvkm_gpuobj_heap_map(struct nvkm_gpuobj *gpuobj, u64 offset,
47		     struct nvkm_vmm *vmm, struct nvkm_vma *vma,
48		     void *argv, u32 argc)
49{
50	return nvkm_memory_map(gpuobj->memory, offset, vmm, vma, argv, argc);
51}
52
53static u32
54nvkm_gpuobj_heap_rd32(struct nvkm_gpuobj *gpuobj, u32 offset)
55{
56	return nvkm_ro32(gpuobj->memory, offset);
57}
58
59static void
60nvkm_gpuobj_heap_wr32(struct nvkm_gpuobj *gpuobj, u32 offset, u32 data)
61{
62	nvkm_wo32(gpuobj->memory, offset, data);
63}
64
65static const struct nvkm_gpuobj_func nvkm_gpuobj_heap;
66static void
67nvkm_gpuobj_heap_release(struct nvkm_gpuobj *gpuobj)
68{
69	gpuobj->func = &nvkm_gpuobj_heap;
70	nvkm_done(gpuobj->memory);
71}
72
73static const struct nvkm_gpuobj_func
74nvkm_gpuobj_heap_fast = {
75	.release = nvkm_gpuobj_heap_release,
76	.rd32 = nvkm_gpuobj_rd32_fast,
77	.wr32 = nvkm_gpuobj_wr32_fast,
78	.map = nvkm_gpuobj_heap_map,
79};
80
81static const struct nvkm_gpuobj_func
82nvkm_gpuobj_heap_slow = {
83	.release = nvkm_gpuobj_heap_release,
84	.rd32 = nvkm_gpuobj_heap_rd32,
85	.wr32 = nvkm_gpuobj_heap_wr32,
86	.map = nvkm_gpuobj_heap_map,
87};
88
89static void *
90nvkm_gpuobj_heap_acquire(struct nvkm_gpuobj *gpuobj)
91{
92	gpuobj->map = nvkm_kmap(gpuobj->memory);
93	if (likely(gpuobj->map))
94		gpuobj->func = &nvkm_gpuobj_heap_fast;
95	else
96		gpuobj->func = &nvkm_gpuobj_heap_slow;
97	return gpuobj->map;
98}
99
100static const struct nvkm_gpuobj_func
101nvkm_gpuobj_heap = {
102	.acquire = nvkm_gpuobj_heap_acquire,
103	.map = nvkm_gpuobj_heap_map,
104};
105
106/* accessor functions for gpuobjs sub-allocated from a parent gpuobj */
107static int
108nvkm_gpuobj_map(struct nvkm_gpuobj *gpuobj, u64 offset,
109		struct nvkm_vmm *vmm, struct nvkm_vma *vma,
110		void *argv, u32 argc)
111{
112	return nvkm_memory_map(gpuobj->parent, gpuobj->node->offset + offset,
113			       vmm, vma, argv, argc);
114}
115
116static u32
117nvkm_gpuobj_rd32(struct nvkm_gpuobj *gpuobj, u32 offset)
118{
119	return nvkm_ro32(gpuobj->parent, gpuobj->node->offset + offset);
120}
121
122static void
123nvkm_gpuobj_wr32(struct nvkm_gpuobj *gpuobj, u32 offset, u32 data)
124{
125	nvkm_wo32(gpuobj->parent, gpuobj->node->offset + offset, data);
126}
127
128static const struct nvkm_gpuobj_func nvkm_gpuobj_func;
129static void
130nvkm_gpuobj_release(struct nvkm_gpuobj *gpuobj)
131{
132	gpuobj->func = &nvkm_gpuobj_func;
133	nvkm_done(gpuobj->parent);
134}
135
136static const struct nvkm_gpuobj_func
137nvkm_gpuobj_fast = {
138	.release = nvkm_gpuobj_release,
139	.rd32 = nvkm_gpuobj_rd32_fast,
140	.wr32 = nvkm_gpuobj_wr32_fast,
141	.map = nvkm_gpuobj_map,
142};
143
144static const struct nvkm_gpuobj_func
145nvkm_gpuobj_slow = {
146	.release = nvkm_gpuobj_release,
147	.rd32 = nvkm_gpuobj_rd32,
148	.wr32 = nvkm_gpuobj_wr32,
149	.map = nvkm_gpuobj_map,
150};
151
152static void *
153nvkm_gpuobj_acquire(struct nvkm_gpuobj *gpuobj)
154{
155	gpuobj->map = nvkm_kmap(gpuobj->parent);
156	if (likely(gpuobj->map)) {
157		gpuobj->map  = (u8 *)gpuobj->map + gpuobj->node->offset;
158		gpuobj->func = &nvkm_gpuobj_fast;
159	} else {
160		gpuobj->func = &nvkm_gpuobj_slow;
161	}
162	return gpuobj->map;
163}
164
165static const struct nvkm_gpuobj_func
166nvkm_gpuobj_func = {
167	.acquire = nvkm_gpuobj_acquire,
168	.map = nvkm_gpuobj_map,
169};
170
171static int
172nvkm_gpuobj_ctor(struct nvkm_device *device, u32 size, int align, bool zero,
173		 struct nvkm_gpuobj *parent, struct nvkm_gpuobj *gpuobj)
174{
175	u32 offset;
176	int ret;
177
178	if (parent) {
179		if (align >= 0) {
180			ret = nvkm_mm_head(&parent->heap, 0, 1, size, size,
181					   max(align, 1), &gpuobj->node);
182		} else {
183			ret = nvkm_mm_tail(&parent->heap, 0, 1, size, size,
184					   -align, &gpuobj->node);
185		}
186		if (ret)
187			return ret;
188
189		gpuobj->parent = parent;
190		gpuobj->func = &nvkm_gpuobj_func;
191		gpuobj->addr = parent->addr + gpuobj->node->offset;
192		gpuobj->size = gpuobj->node->length;
193
194		if (zero) {
195			nvkm_kmap(gpuobj);
196			for (offset = 0; offset < gpuobj->size; offset += 4)
197				nvkm_wo32(gpuobj, offset, 0x00000000);
198			nvkm_done(gpuobj);
199		}
200	} else {
201		ret = nvkm_memory_new(device, NVKM_MEM_TARGET_INST, size,
202				      abs(align), zero, &gpuobj->memory);
203		if (ret)
204			return ret;
205
206		gpuobj->func = &nvkm_gpuobj_heap;
207		gpuobj->addr = nvkm_memory_addr(gpuobj->memory);
208		gpuobj->size = nvkm_memory_size(gpuobj->memory);
209	}
210
211	return nvkm_mm_init(&gpuobj->heap, 0, 0, gpuobj->size, 1);
212}
213
214void
215nvkm_gpuobj_del(struct nvkm_gpuobj **pgpuobj)
216{
217	struct nvkm_gpuobj *gpuobj = *pgpuobj;
218	if (gpuobj) {
219		if (gpuobj->parent)
220			nvkm_mm_free(&gpuobj->parent->heap, &gpuobj->node);
221		nvkm_mm_fini(&gpuobj->heap);
222		nvkm_memory_unref(&gpuobj->memory);
223		kfree(*pgpuobj);
224		*pgpuobj = NULL;
225	}
226}
227
228int
229nvkm_gpuobj_new(struct nvkm_device *device, u32 size, int align, bool zero,
230		struct nvkm_gpuobj *parent, struct nvkm_gpuobj **pgpuobj)
231{
232	struct nvkm_gpuobj *gpuobj;
233	int ret;
234
235	if (!(gpuobj = *pgpuobj = kzalloc(sizeof(*gpuobj), GFP_KERNEL)))
236		return -ENOMEM;
237
238	ret = nvkm_gpuobj_ctor(device, size, align, zero, parent, gpuobj);
239	if (ret)
240		nvkm_gpuobj_del(pgpuobj);
241	return ret;
242}
243
244/* the below is basically only here to support sharing the paged dma object
245 * for PCI(E)GART on <=nv4x chipsets, and should *not* be expected to work
246 * anywhere else.
247 */
248
249int
250nvkm_gpuobj_wrap(struct nvkm_memory *memory, struct nvkm_gpuobj **pgpuobj)
251{
252	if (!(*pgpuobj = kzalloc(sizeof(**pgpuobj), GFP_KERNEL)))
253		return -ENOMEM;
254
255	(*pgpuobj)->addr = nvkm_memory_addr(memory);
256	(*pgpuobj)->size = nvkm_memory_size(memory);
257	return 0;
258}
259
260void
261nvkm_gpuobj_memcpy_to(struct nvkm_gpuobj *dst, u32 dstoffset, void *src,
262		      u32 length)
263{
264	int i;
265
266	for (i = 0; i < length; i += 4)
267		nvkm_wo32(dst, dstoffset + i, *(u32 *)(src + i));
268}
269
270void
271nvkm_gpuobj_memcpy_from(void *dst, struct nvkm_gpuobj *src, u32 srcoffset,
272			u32 length)
273{
274	int i;
275
276	for (i = 0; i < length; i += 4)
277		((u32 *)src)[i / 4] = nvkm_ro32(src, srcoffset + i);
278}
279