1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
/*
Copyright (C) Intel Corp. 2006. All Rights Reserved.
Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
develop this 3D driver.
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice (including the
next paragraph) shall be included in all copies or substantial
portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
**********************************************************************/
/*
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
*/
#include "intel_batchbuffer.h"
#include "brw_context.h"
#include "brw_state.h"
#include "brw_defines.h"
#define VS 0
#define GS 1
#define CLP 2
#define SF 3
#define CS 4
/** @file brw_urb.c
*
* Manages the division of the URB space between the various fixed-function
* units.
*
* See the Thread Initiation Management section of the GEN4 B-Spec, and
* the individual *_STATE structures for restrictions on numbers of
* entries and threads.
*/
/*
* Generally, a unit requires a min_nr_entries based on how many entries
* it produces before the downstream unit gets unblocked and can use and
* dereference some of its handles.
*
* The SF unit preallocates a PUE at the start of thread dispatch, and only
* uses that one. So it requires one entry per thread.
*
* For CLIP, the SF unit will hold the previous primitive while the
* next is getting assembled, meaning that linestrips require 3 CLIP VUEs
* (vertices) to ensure continued processing, trifans require 4, and tristrips
* require 5. There can be 1 or 2 threads, and each has the same requirement.
*
* GS has the same requirement as CLIP, but it never handles tristrips,
* so we can lower the minimum to 4 for the POLYGONs (trifans) it produces.
* We only run it single-threaded.
*
* For VS, the number of entries may be 8, 12, 16, or 32 (or 64 on G4X).
* Each thread processes 2 preallocated VUEs (vertices) at a time, and they
* get streamed down as soon as threads processing earlier vertices get
* theirs accepted.
*
* Each unit will take the number of URB entries we give it (based on the
* entry size calculated in brw_vs_emit.c for VUEs, brw_sf_emit.c for PUEs,
* and brw_curbe.c for the CURBEs) and decide its maximum number of
* threads it can support based on that. in brw_*_state.c.
*
* XXX: Are the min_entry_size numbers useful?
* XXX: Verify min_nr_entries, esp for VS.
* XXX: Verify SF min_entry_size.
*/
static const struct {
GLuint min_nr_entries;
GLuint preferred_nr_entries;
GLuint min_entry_size;
GLuint max_entry_size;
} limits[CS+1] = {
{ 16, 32, 1, 5 }, /* vs */
{ 4, 8, 1, 5 }, /* gs */
{ 5, 10, 1, 5 }, /* clp */
{ 1, 8, 1, 12 }, /* sf */
{ 1, 4, 1, 32 } /* cs */
};
static GLboolean check_urb_layout( struct brw_context *brw )
{
brw->urb.vs_start = 0;
brw->urb.gs_start = brw->urb.nr_vs_entries * brw->urb.vsize;
brw->urb.clip_start = brw->urb.gs_start + brw->urb.nr_gs_entries * brw->urb.vsize;
brw->urb.sf_start = brw->urb.clip_start + brw->urb.nr_clip_entries * brw->urb.vsize;
brw->urb.cs_start = brw->urb.sf_start + brw->urb.nr_sf_entries * brw->urb.sfsize;
return brw->urb.cs_start + brw->urb.nr_cs_entries *
brw->urb.csize <= brw->urb.size;
}
/* Most minimal update, forces re-emit of URB fence packet after GS
* unit turned on/off.
*/
static void recalculate_urb_fence( struct brw_context *brw )
{
struct intel_context *intel = &brw->intel;
GLuint csize = brw->curbe.total_size;
GLuint vsize = brw->vs.prog_data->urb_entry_size;
GLuint sfsize = brw->sf.prog_data->urb_entry_size;
if (csize < limits[CS].min_entry_size)
csize = limits[CS].min_entry_size;
if (vsize < limits[VS].min_entry_size)
vsize = limits[VS].min_entry_size;
if (sfsize < limits[SF].min_entry_size)
sfsize = limits[SF].min_entry_size;
if (brw->urb.vsize < vsize ||
brw->urb.sfsize < sfsize ||
brw->urb.csize < csize ||
(brw->urb.constrained && (brw->urb.vsize > vsize ||
brw->urb.sfsize > sfsize ||
brw->urb.csize > csize))) {
brw->urb.csize = csize;
brw->urb.sfsize = sfsize;
brw->urb.vsize = vsize;
brw->urb.nr_vs_entries = limits[VS].preferred_nr_entries;
brw->urb.nr_gs_entries = limits[GS].preferred_nr_entries;
brw->urb.nr_clip_entries = limits[CLP].preferred_nr_entries;
brw->urb.nr_sf_entries = limits[SF].preferred_nr_entries;
brw->urb.nr_cs_entries = limits[CS].preferred_nr_entries;
brw->urb.constrained = 0;
if (intel->gen == 5) {
brw->urb.nr_vs_entries = 128;
brw->urb.nr_sf_entries = 48;
if (check_urb_layout(brw)) {
goto done;
} else {
brw->urb.constrained = 1;
brw->urb.nr_vs_entries = limits[VS].preferred_nr_entries;
brw->urb.nr_sf_entries = limits[SF].preferred_nr_entries;
}
} else if (intel->is_g4x) {
brw->urb.nr_vs_entries = 64;
if (check_urb_layout(brw)) {
goto done;
} else {
brw->urb.constrained = 1;
brw->urb.nr_vs_entries = limits[VS].preferred_nr_entries;
}
}
if (!check_urb_layout(brw)) {
brw->urb.nr_vs_entries = limits[VS].min_nr_entries;
brw->urb.nr_gs_entries = limits[GS].min_nr_entries;
brw->urb.nr_clip_entries = limits[CLP].min_nr_entries;
brw->urb.nr_sf_entries = limits[SF].min_nr_entries;
brw->urb.nr_cs_entries = limits[CS].min_nr_entries;
/* Mark us as operating with constrained nr_entries, so that next
* time we recalculate we'll resize the fences in the hope of
* escaping constrained mode and getting back to normal performance.
*/
brw->urb.constrained = 1;
if (!check_urb_layout(brw)) {
/* This is impossible, given the maximal sizes of urb
* entries and the values for minimum nr of entries
* provided above.
*/
printf("couldn't calculate URB layout!\n");
exit(1);
}
if (unlikely(INTEL_DEBUG & (DEBUG_URB|DEBUG_FALLBACKS)))
printf("URB CONSTRAINED\n");
}
done:
if (unlikely(INTEL_DEBUG & DEBUG_URB))
printf("URB fence: %d ..VS.. %d ..GS.. %d ..CLP.. %d ..SF.. %d ..CS.. %d\n",
brw->urb.vs_start,
brw->urb.gs_start,
brw->urb.clip_start,
brw->urb.sf_start,
brw->urb.cs_start,
brw->urb.size);
brw->state.dirty.brw |= BRW_NEW_URB_FENCE;
}
}
const struct brw_tracked_state brw_recalculate_urb_fence = {
.dirty = {
.mesa = 0,
.brw = BRW_NEW_CURBE_OFFSETS,
.cache = (CACHE_NEW_VS_PROG |
CACHE_NEW_SF_PROG)
},
.prepare = recalculate_urb_fence
};
void brw_upload_urb_fence(struct brw_context *brw)
{
struct brw_urb_fence uf;
memset(&uf, 0, sizeof(uf));
uf.header.opcode = CMD_URB_FENCE;
uf.header.length = sizeof(uf)/4-2;
uf.header.vs_realloc = 1;
uf.header.gs_realloc = 1;
uf.header.clp_realloc = 1;
uf.header.sf_realloc = 1;
uf.header.vfe_realloc = 1;
uf.header.cs_realloc = 1;
/* The ordering below is correct, not the layout in the
* instruction.
*
* There are 256/384 urb reg pairs in total.
*/
uf.bits0.vs_fence = brw->urb.gs_start;
uf.bits0.gs_fence = brw->urb.clip_start;
uf.bits0.clp_fence = brw->urb.sf_start;
uf.bits1.sf_fence = brw->urb.cs_start;
uf.bits1.cs_fence = brw->urb.size;
/* erratum: URB_FENCE must not cross a 64byte cacheline */
if ((brw->intel.batch.used & 15) > 12) {
int pad = 16 - (brw->intel.batch.used & 15);
do
brw->intel.batch.map[brw->intel.batch.used++] = MI_NOOP;
while (--pad);
}
BRW_BATCH_STRUCT(brw, &uf);
}
|
