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 
31 struct 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 
38 static const struct intel_renderstate_rodata *
39 render_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 
53 static 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 
76 free_gem:
77 	drm_gem_object_unreference(&so->obj->base);
78 	return ret;
79 }
80 
81 static 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 vm_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 = so->obj->pages[0];
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 
130 static 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 
136 int 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 */
166 out:
167 	render_state_fini(&so);
168 	return ret;
169 }
170