1 /* 2 * Copyright 2011 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 24 #include "main/macros.h" 25 #include "intel_batchbuffer.h" 26 #include "brw_context.h" 27 #include "brw_state.h" 28 #include "brw_defines.h" 29 30 #include "common/gen_l3_config.h" 31 32 /** 33 * The following diagram shows how we partition the URB: 34 * 35 * 16kB or 32kB Rest of the URB space 36 * __________-__________ _________________-_________________ 37 * / \ / \ 38 * +-------------------------------------------------------------+ 39 * | VS/HS/DS/GS/FS Push | VS/HS/DS/GS URB | 40 * | Constants | Entries | 41 * +-------------------------------------------------------------+ 42 * 43 * Notably, push constants must be stored at the beginning of the URB 44 * space, while entries can be stored anywhere. Ivybridge and Haswell 45 * GT1/GT2 have a maximum constant buffer size of 16kB, while Haswell GT3 46 * doubles this (32kB). 47 * 48 * Ivybridge and Haswell GT1/GT2 allow push constants to be located (and 49 * sized) in increments of 1kB. Haswell GT3 requires them to be located and 50 * sized in increments of 2kB. 51 * 52 * Currently we split the constant buffer space evenly among whatever stages 53 * are active. This is probably not ideal, but simple. 54 * 55 * Ivybridge GT1 and Haswell GT1 have 128kB of URB space. 56 * Ivybridge GT2 and Haswell GT2 have 256kB of URB space. 57 * Haswell GT3 has 512kB of URB space. 58 * 59 * See "Volume 2a: 3D Pipeline," section 1.8, "Volume 1b: Configurations", 60 * and the documentation for 3DSTATE_PUSH_CONSTANT_ALLOC_xS. 61 */ 62 static void 63 gen7_allocate_push_constants(struct brw_context *brw) 64 { 65 /* BRW_NEW_GEOMETRY_PROGRAM */ 66 bool gs_present = brw->geometry_program; 67 68 /* BRW_NEW_TESS_PROGRAMS */ 69 bool tess_present = brw->tess_eval_program; 70 71 unsigned avail_size = 16; 72 unsigned multiplier = 73 (brw->gen >= 8 || (brw->is_haswell && brw->gt == 3)) ? 2 : 1; 74 75 int stages = 2 + gs_present + 2 * tess_present; 76 77 /* Divide up the available space equally between stages. Because we 78 * round down (using floor division), there may be some left over 79 * space. We allocate that to the pixel shader stage. 80 */ 81 unsigned size_per_stage = avail_size / stages; 82 83 unsigned vs_size = size_per_stage; 84 unsigned hs_size = tess_present ? size_per_stage : 0; 85 unsigned ds_size = tess_present ? size_per_stage : 0; 86 unsigned gs_size = gs_present ? size_per_stage : 0; 87 unsigned fs_size = avail_size - size_per_stage * (stages - 1); 88 89 gen7_emit_push_constant_state(brw, multiplier * vs_size, 90 multiplier * hs_size, multiplier * ds_size, 91 multiplier * gs_size, multiplier * fs_size); 92 93 /* From p115 of the Ivy Bridge PRM (3.2.1.4 3DSTATE_PUSH_CONSTANT_ALLOC_VS): 94 * 95 * Programming Restriction: 96 * 97 * The 3DSTATE_CONSTANT_VS must be reprogrammed prior to the next 98 * 3DPRIMITIVE command after programming the 99 * 3DSTATE_PUSH_CONSTANT_ALLOC_VS. 100 * 101 * Similar text exists for the other 3DSTATE_PUSH_CONSTANT_ALLOC_* 102 * commands. 103 */ 104 brw->ctx.NewDriverState |= BRW_NEW_PUSH_CONSTANT_ALLOCATION; 105 } 106 107 void 108 gen7_emit_push_constant_state(struct brw_context *brw, unsigned vs_size, 109 unsigned hs_size, unsigned ds_size, 110 unsigned gs_size, unsigned fs_size) 111 { 112 unsigned offset = 0; 113 114 BEGIN_BATCH(10); 115 OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_VS << 16 | (2 - 2)); 116 OUT_BATCH(vs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT); 117 offset += vs_size; 118 119 OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_HS << 16 | (2 - 2)); 120 OUT_BATCH(hs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT); 121 offset += hs_size; 122 123 OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_DS << 16 | (2 - 2)); 124 OUT_BATCH(ds_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT); 125 offset += ds_size; 126 127 OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_GS << 16 | (2 - 2)); 128 OUT_BATCH(gs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT); 129 offset += gs_size; 130 131 OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_PS << 16 | (2 - 2)); 132 OUT_BATCH(fs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT); 133 ADVANCE_BATCH(); 134 135 /* From p292 of the Ivy Bridge PRM (11.2.4 3DSTATE_PUSH_CONSTANT_ALLOC_PS): 136 * 137 * A PIPE_CONTROL command with the CS Stall bit set must be programmed 138 * in the ring after this instruction. 139 * 140 * No such restriction exists for Haswell or Baytrail. 141 */ 142 if (brw->gen < 8 && !brw->is_haswell && !brw->is_baytrail) 143 gen7_emit_cs_stall_flush(brw); 144 } 145 146 const struct brw_tracked_state gen7_push_constant_space = { 147 .dirty = { 148 .mesa = 0, 149 .brw = BRW_NEW_CONTEXT | 150 BRW_NEW_GEOMETRY_PROGRAM | 151 BRW_NEW_TESS_PROGRAMS, 152 }, 153 .emit = gen7_allocate_push_constants, 154 }; 155 156 static void 157 upload_urb(struct brw_context *brw) 158 { 159 /* BRW_NEW_VS_PROG_DATA */ 160 const struct brw_vue_prog_data *vs_vue_prog_data = 161 brw_vue_prog_data(brw->vs.base.prog_data); 162 const unsigned vs_size = MAX2(vs_vue_prog_data->urb_entry_size, 1); 163 /* BRW_NEW_GS_PROG_DATA */ 164 const bool gs_present = brw->gs.base.prog_data; 165 /* BRW_NEW_TES_PROG_DATA */ 166 const bool tess_present = brw->tes.base.prog_data; 167 168 gen7_upload_urb(brw, vs_size, gs_present, tess_present); 169 } 170 171 void 172 gen7_upload_urb(struct brw_context *brw, unsigned vs_size, 173 bool gs_present, bool tess_present) 174 { 175 const struct gen_device_info *devinfo = &brw->screen->devinfo; 176 const int push_size_kB = 177 (brw->gen >= 8 || (brw->is_haswell && brw->gt == 3)) ? 32 : 16; 178 179 /* BRW_NEW_{VS,TCS,TES,GS}_PROG_DATA */ 180 struct brw_vue_prog_data *prog_data[4] = { 181 [MESA_SHADER_VERTEX] = 182 brw_vue_prog_data(brw->vs.base.prog_data), 183 [MESA_SHADER_TESS_CTRL] = 184 tess_present ? brw_vue_prog_data(brw->tcs.base.prog_data) : NULL, 185 [MESA_SHADER_TESS_EVAL] = 186 tess_present ? brw_vue_prog_data(brw->tes.base.prog_data) : NULL, 187 [MESA_SHADER_GEOMETRY] = 188 gs_present ? brw_vue_prog_data(brw->gs.base.prog_data) : NULL, 189 }; 190 191 unsigned entry_size[4]; 192 entry_size[MESA_SHADER_VERTEX] = vs_size; 193 for (int i = MESA_SHADER_TESS_CTRL; i <= MESA_SHADER_GEOMETRY; i++) { 194 entry_size[i] = prog_data[i] ? prog_data[i]->urb_entry_size : 1; 195 } 196 197 /* If we're just switching between programs with the same URB requirements, 198 * skip the rest of the logic. 199 */ 200 if (!(brw->ctx.NewDriverState & BRW_NEW_CONTEXT) && 201 !(brw->ctx.NewDriverState & BRW_NEW_URB_SIZE) && 202 brw->urb.vsize == entry_size[MESA_SHADER_VERTEX] && 203 brw->urb.gs_present == gs_present && 204 brw->urb.gsize == entry_size[MESA_SHADER_GEOMETRY] && 205 brw->urb.tess_present == tess_present && 206 brw->urb.hsize == entry_size[MESA_SHADER_TESS_CTRL] && 207 brw->urb.dsize == entry_size[MESA_SHADER_TESS_EVAL]) { 208 return; 209 } 210 brw->urb.vsize = entry_size[MESA_SHADER_VERTEX]; 211 brw->urb.gs_present = gs_present; 212 brw->urb.gsize = entry_size[MESA_SHADER_GEOMETRY]; 213 brw->urb.tess_present = tess_present; 214 brw->urb.hsize = entry_size[MESA_SHADER_TESS_CTRL]; 215 brw->urb.dsize = entry_size[MESA_SHADER_TESS_EVAL]; 216 217 unsigned entries[4]; 218 unsigned start[4]; 219 gen_get_urb_config(devinfo, 1024 * push_size_kB, 1024 * brw->urb.size, 220 tess_present, gs_present, entry_size, entries, start); 221 222 if (brw->gen == 7 && !brw->is_haswell && !brw->is_baytrail) 223 gen7_emit_vs_workaround_flush(brw); 224 225 BEGIN_BATCH(8); 226 for (int i = MESA_SHADER_VERTEX; i <= MESA_SHADER_GEOMETRY; i++) { 227 OUT_BATCH((_3DSTATE_URB_VS + i) << 16 | (2 - 2)); 228 OUT_BATCH(entries[i] | 229 ((entry_size[i] - 1) << GEN7_URB_ENTRY_SIZE_SHIFT) | 230 (start[i] << GEN7_URB_STARTING_ADDRESS_SHIFT)); 231 } 232 ADVANCE_BATCH(); 233 } 234 235 const struct brw_tracked_state gen7_urb = { 236 .dirty = { 237 .mesa = 0, 238 .brw = BRW_NEW_CONTEXT | 239 BRW_NEW_URB_SIZE | 240 BRW_NEW_GS_PROG_DATA | 241 BRW_NEW_TCS_PROG_DATA | 242 BRW_NEW_TES_PROG_DATA | 243 BRW_NEW_VS_PROG_DATA, 244 }, 245 .emit = upload_urb, 246 }; 247
