i915_gem_render_state.c revision 1ce826d436f33c8fc0cf8b51d213b496ea73e0a6 
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
31struct render_state {
32	const struct intel_renderstate_rodata *rodata;
33	struct drm_i915_gem_object *obj;
34	u64 ggtt_offset;
35	int gen;
36};
37
38static const struct intel_renderstate_rodata *
39render_state_get_rodata(struct drm_device *dev, const int gen)
40{
41	switch (gen) {
42	case 6:
43		return &gen6_null_state;
44	case 7:
45		return &gen7_null_state;
46	case 8:
47		return &gen8_null_state;
48	}
49
50	return NULL;
51}
52
53static int render_state_init(struct render_state *so, struct drm_device *dev)
54{
55	int ret;
56
57	so->gen = INTEL_INFO(dev)->gen;
58	so->rodata = render_state_get_rodata(dev, so->gen);
59	if (so->rodata == NULL)
60		return 0;
61
62	if (so->rodata->batch_items * 4 > 4096)
63		return -EINVAL;
64
65	so->obj = i915_gem_alloc_object(dev, 4096);
66	if (so->obj == NULL)
67		return -ENOMEM;
68
69	ret = i915_gem_obj_ggtt_pin(so->obj, 4096, 0);
70	if (ret)
71		goto free_gem;
72
73	so->ggtt_offset = i915_gem_obj_ggtt_offset(so->obj);
74	return 0;
75
76free_gem:
77	drm_gem_object_unreference(&so->obj->base);
78	return ret;
79}
80
81static int render_state_setup(struct render_state *so)
82{
83	const struct intel_renderstate_rodata *rodata = so->rodata;
84	unsigned int i = 0, reloc_index = 0;
85	struct page *page;
86	u32 *d;
87	int ret;
88
89	ret = i915_gem_object_set_to_cpu_domain(so->obj, true);
90	if (ret)
91		return ret;
92
93	page = sg_page(so->obj->pages->sgl);
94	d = kmap(page);
95
96	while (i < rodata->batch_items) {
97		u32 s = rodata->batch[i];
98
99		if (i * 4  == rodata->reloc[reloc_index]) {
100			u64 r = s + so->ggtt_offset;
101			s = lower_32_bits(r);
102			if (so->gen >= 8) {
103				if (i + 1 >= rodata->batch_items ||
104				    rodata->batch[i + 1] != 0)
105					return -EINVAL;
106
107				d[i++] = s;
108				s = upper_32_bits(r);
109			}
110
111			reloc_index++;
112		}
113
114		d[i++] = s;
115	}
116	kunmap(page);
117
118	ret = i915_gem_object_set_to_gtt_domain(so->obj, false);
119	if (ret)
120		return ret;
121
122	if (rodata->reloc[reloc_index] != -1) {
123		DRM_ERROR("only %d relocs resolved\n", reloc_index);
124		return -EINVAL;
125	}
126
127	return 0;
128}
129
130static void render_state_fini(struct render_state *so)
131{
132	i915_gem_object_ggtt_unpin(so->obj);
133	drm_gem_object_unreference(&so->obj->base);
134}
135
136int i915_gem_render_state_init(struct intel_engine_cs *ring)
137{
138	struct render_state so;
139	int ret;
140
141	if (WARN_ON(ring->id != RCS))
142		return -ENOENT;
143
144	ret = render_state_init(&so, ring->dev);
145	if (ret)
146		return ret;
147
148	if (so.rodata == NULL)
149		return 0;
150
151	ret = render_state_setup(&so);
152	if (ret)
153		goto out;
154
155	ret = ring->dispatch_execbuffer(ring,
156					so.ggtt_offset,
157					so.rodata->batch_items * 4,
158					I915_DISPATCH_SECURE);
159	if (ret)
160		goto out;
161
162	i915_vma_move_to_active(i915_gem_obj_to_ggtt(so.obj), ring);
163
164	ret = __i915_add_request(ring, NULL, so.obj, NULL);
165	/* __i915_add_request moves object to inactive if it fails */
166out:
167	render_state_fini(&so);
168	return ret;
169}
170