1/*
2 * Copyright © 2014 Intel Corporation
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 (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 *    Mika Kuoppala <mika.kuoppala@intel.com>
25 *
26 */
27
28#include "i915_drv.h"
29#include "intel_renderstate.h"
30
31static const struct intel_renderstate_rodata *
32render_state_get_rodata(struct drm_device *dev, const int gen)
33{
34	switch (gen) {
35	case 6:
36		return &gen6_null_state;
37	case 7:
38		return &gen7_null_state;
39	case 8:
40		return &gen8_null_state;
41	}
42
43	return NULL;
44}
45
46static int render_state_init(struct render_state *so, struct drm_device *dev)
47{
48	int ret;
49
50	so->gen = INTEL_INFO(dev)->gen;
51	so->rodata = render_state_get_rodata(dev, so->gen);
52	if (so->rodata == NULL)
53		return 0;
54
55	if (so->rodata->batch_items * 4 > 4096)
56		return -EINVAL;
57
58	so->obj = i915_gem_alloc_object(dev, 4096);
59	if (so->obj == NULL)
60		return -ENOMEM;
61
62	ret = i915_gem_obj_ggtt_pin(so->obj, 4096, 0);
63	if (ret)
64		goto free_gem;
65
66	so->ggtt_offset = i915_gem_obj_ggtt_offset(so->obj);
67	return 0;
68
69free_gem:
70	drm_gem_object_unreference(&so->obj->base);
71	return ret;
72}
73
74static int render_state_setup(struct render_state *so)
75{
76	const struct intel_renderstate_rodata *rodata = so->rodata;
77	unsigned int i = 0, reloc_index = 0;
78	struct page *page;
79	u32 *d;
80	int ret;
81
82	ret = i915_gem_object_set_to_cpu_domain(so->obj, true);
83	if (ret)
84		return ret;
85
86	page = sg_page(so->obj->pages->sgl);
87	d = kmap(page);
88
89	while (i < rodata->batch_items) {
90		u32 s = rodata->batch[i];
91
92		if (i * 4  == rodata->reloc[reloc_index]) {
93			u64 r = s + so->ggtt_offset;
94			s = lower_32_bits(r);
95			if (so->gen >= 8) {
96				if (i + 1 >= rodata->batch_items ||
97				    rodata->batch[i + 1] != 0)
98					return -EINVAL;
99
100				d[i++] = s;
101				s = upper_32_bits(r);
102			}
103
104			reloc_index++;
105		}
106
107		d[i++] = s;
108	}
109	kunmap(page);
110
111	ret = i915_gem_object_set_to_gtt_domain(so->obj, false);
112	if (ret)
113		return ret;
114
115	if (rodata->reloc[reloc_index] != -1) {
116		DRM_ERROR("only %d relocs resolved\n", reloc_index);
117		return -EINVAL;
118	}
119
120	return 0;
121}
122
123void i915_gem_render_state_fini(struct render_state *so)
124{
125	i915_gem_object_ggtt_unpin(so->obj);
126	drm_gem_object_unreference(&so->obj->base);
127}
128
129int i915_gem_render_state_prepare(struct intel_engine_cs *ring,
130				  struct render_state *so)
131{
132	int ret;
133
134	if (WARN_ON(ring->id != RCS))
135		return -ENOENT;
136
137	ret = render_state_init(so, ring->dev);
138	if (ret)
139		return ret;
140
141	if (so->rodata == NULL)
142		return 0;
143
144	ret = render_state_setup(so);
145	if (ret) {
146		i915_gem_render_state_fini(so);
147		return ret;
148	}
149
150	return 0;
151}
152
153int i915_gem_render_state_init(struct intel_engine_cs *ring)
154{
155	struct render_state so;
156	int ret;
157
158	ret = i915_gem_render_state_prepare(ring, &so);
159	if (ret)
160		return ret;
161
162	if (so.rodata == NULL)
163		return 0;
164
165	ret = ring->dispatch_execbuffer(ring,
166					so.ggtt_offset,
167					so.rodata->batch_items * 4,
168					I915_DISPATCH_SECURE);
169	if (ret)
170		goto out;
171
172	i915_vma_move_to_active(i915_gem_obj_to_ggtt(so.obj), ring);
173
174	ret = __i915_add_request(ring, NULL, so.obj, NULL);
175	/* __i915_add_request moves object to inactive if it fails */
176out:
177	i915_gem_render_state_fini(&so);
178	return ret;
179}
180