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	case 9:
42		return &gen9_null_state;
43	}
44
45	return NULL;
46}
47
48static int render_state_init(struct render_state *so, struct drm_device *dev)
49{
50	int ret;
51
52	so->gen = INTEL_INFO(dev)->gen;
53	so->rodata = render_state_get_rodata(dev, so->gen);
54	if (so->rodata == NULL)
55		return 0;
56
57	if (so->rodata->batch_items * 4 > 4096)
58		return -EINVAL;
59
60	so->obj = i915_gem_alloc_object(dev, 4096);
61	if (so->obj == NULL)
62		return -ENOMEM;
63
64	ret = i915_gem_obj_ggtt_pin(so->obj, 4096, 0);
65	if (ret)
66		goto free_gem;
67
68	so->ggtt_offset = i915_gem_obj_ggtt_offset(so->obj);
69	return 0;
70
71free_gem:
72	drm_gem_object_unreference(&so->obj->base);
73	return ret;
74}
75
76static int render_state_setup(struct render_state *so)
77{
78	const struct intel_renderstate_rodata *rodata = so->rodata;
79	unsigned int i = 0, reloc_index = 0;
80	struct page *page;
81	u32 *d;
82	int ret;
83
84	ret = i915_gem_object_set_to_cpu_domain(so->obj, true);
85	if (ret)
86		return ret;
87
88	page = sg_page(so->obj->pages->sgl);
89	d = kmap(page);
90
91	while (i < rodata->batch_items) {
92		u32 s = rodata->batch[i];
93
94		if (i * 4  == rodata->reloc[reloc_index]) {
95			u64 r = s + so->ggtt_offset;
96			s = lower_32_bits(r);
97			if (so->gen >= 8) {
98				if (i + 1 >= rodata->batch_items ||
99				    rodata->batch[i + 1] != 0)
100					return -EINVAL;
101
102				d[i++] = s;
103				s = upper_32_bits(r);
104			}
105
106			reloc_index++;
107		}
108
109		d[i++] = s;
110	}
111	kunmap(page);
112
113	ret = i915_gem_object_set_to_gtt_domain(so->obj, false);
114	if (ret)
115		return ret;
116
117	if (rodata->reloc[reloc_index] != -1) {
118		DRM_ERROR("only %d relocs resolved\n", reloc_index);
119		return -EINVAL;
120	}
121
122	return 0;
123}
124
125void i915_gem_render_state_fini(struct render_state *so)
126{
127	i915_gem_object_ggtt_unpin(so->obj);
128	drm_gem_object_unreference(&so->obj->base);
129}
130
131int i915_gem_render_state_prepare(struct intel_engine_cs *ring,
132				  struct render_state *so)
133{
134	int ret;
135
136	if (WARN_ON(ring->id != RCS))
137		return -ENOENT;
138
139	ret = render_state_init(so, ring->dev);
140	if (ret)
141		return ret;
142
143	if (so->rodata == NULL)
144		return 0;
145
146	ret = render_state_setup(so);
147	if (ret) {
148		i915_gem_render_state_fini(so);
149		return ret;
150	}
151
152	return 0;
153}
154
155int i915_gem_render_state_init(struct intel_engine_cs *ring)
156{
157	struct render_state so;
158	int ret;
159
160	ret = i915_gem_render_state_prepare(ring, &so);
161	if (ret)
162		return ret;
163
164	if (so.rodata == NULL)
165		return 0;
166
167	ret = ring->dispatch_execbuffer(ring,
168					so.ggtt_offset,
169					so.rodata->batch_items * 4,
170					I915_DISPATCH_SECURE);
171	if (ret)
172		goto out;
173
174	i915_vma_move_to_active(i915_gem_obj_to_ggtt(so.obj), ring);
175
176	ret = __i915_add_request(ring, NULL, so.obj);
177	/* __i915_add_request moves object to inactive if it fails */
178out:
179	i915_gem_render_state_fini(&so);
180	return ret;
181}
182