src/intel/common/gen_l3_config.c

   1 /*
   2  * Copyright (c) 2015 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 <stdlib.h>
  25 #include <math.h>
  26
  27 #include "util/macros.h"
  28 #include "main/macros.h"
  29
  30 #include "gen_l3_config.h"
  31
  32 /**
  33  * IVB/HSW validated L3 configurations.  The first entry will be used as
  34  * default by gen7_restore_default_l3_config(), otherwise the ordering is
  35  * unimportant.
  36  */
  37 static const struct gen_l3_config ivb_l3_configs[] = {
  38    /* SLM URB ALL DC  RO  IS   C   T */
  39    {{  0, 32,  0,  0, 32,  0,  0,  0 }},
  40    {{  0, 32,  0, 16, 16,  0,  0,  0 }},
  41    {{  0, 32,  0,  4,  0,  8,  4, 16 }},
  42    {{  0, 28,  0,  8,  0,  8,  4, 16 }},
  43    {{  0, 28,  0, 16,  0,  8,  4,  8 }},
  44    {{  0, 28,  0,  8,  0, 16,  4,  8 }},
  45    {{  0, 28,  0,  0,  0, 16,  4, 16 }},
  46    {{  0, 32,  0,  0,  0, 16,  0, 16 }},
  47    {{  0, 28,  0,  4, 32,  0,  0,  0 }},
  48    {{ 16, 16,  0, 16, 16,  0,  0,  0 }},
  49    {{ 16, 16,  0,  8,  0,  8,  8,  8 }},
  50    {{ 16, 16,  0,  4,  0,  8,  4, 16 }},
  51    {{ 16, 16,  0,  4,  0, 16,  4,  8 }},
  52    {{ 16, 16,  0,  0, 32,  0,  0,  0 }},
  53    {{ 0 }}
  54 };
  55
  56 /**
  57  * VLV validated L3 configurations.  \sa ivb_l3_configs.
  58  */
  59 static const struct gen_l3_config vlv_l3_configs[] = {
  60    /* SLM URB ALL DC  RO  IS   C   T */
  61    {{  0, 64,  0,  0, 32,  0,  0,  0 }},
  62    {{  0, 80,  0,  0, 16,  0,  0,  0 }},
  63    {{  0, 80,  0,  8,  8,  0,  0,  0 }},
  64    {{  0, 64,  0, 16, 16,  0,  0,  0 }},
  65    {{  0, 60,  0,  4, 32,  0,  0,  0 }},
  66    {{ 32, 32,  0, 16, 16,  0,  0,  0 }},
  67    {{ 32, 40,  0,  8, 16,  0,  0,  0 }},
  68    {{ 32, 40,  0, 16,  8,  0,  0,  0 }},
  69    {{ 0 }}
  70 };
  71
  72 /**
  73  * BDW validated L3 configurations.  \sa ivb_l3_configs.
  74  */
  75 static const struct gen_l3_config bdw_l3_configs[] = {
  76    /* SLM URB ALL DC  RO  IS   C   T */
  77    {{  0, 48, 48,  0,  0,  0,  0,  0 }},
  78    {{  0, 48,  0, 16, 32,  0,  0,  0 }},
  79    {{  0, 32,  0, 16, 48,  0,  0,  0 }},
  80    {{  0, 32,  0,  0, 64,  0,  0,  0 }},
  81    {{  0, 32, 64,  0,  0,  0,  0,  0 }},
  82    {{ 24, 16, 48,  0,  0,  0,  0,  0 }},
  83    {{ 24, 16,  0, 16, 32,  0,  0,  0 }},
  84    {{ 24, 16,  0, 32, 16,  0,  0,  0 }},
  85    {{ 0 }}
  86 };
  87
  88 /**
  89  * CHV/SKL validated L3 configurations.  \sa ivb_l3_configs.
  90  */
  91 static const struct gen_l3_config chv_l3_configs[] = {
  92    /* SLM URB ALL DC  RO  IS   C   T */
  93    {{  0, 48, 48,  0,  0,  0,  0,  0 }},
  94    {{  0, 48,  0, 16, 32,  0,  0,  0 }},
  95    {{  0, 32,  0, 16, 48,  0,  0,  0 }},
  96    {{  0, 32,  0,  0, 64,  0,  0,  0 }},
  97    {{  0, 32, 64,  0,  0,  0,  0,  0 }},
  98    {{ 32, 16, 48,  0,  0,  0,  0,  0 }},
  99    {{ 32, 16,  0, 16, 32,  0,  0,  0 }},
 100    {{ 32, 16,  0, 32, 16,  0,  0,  0 }},
 101    {{ 0 }}
 102 };
 103
 104 /**
 105  * BXT 2x6 validated L3 configurations.  \sa ivb_l3_configs.
 106  */
 107 static const struct gen_l3_config bxt_2x6_l3_configs[] = {
 108    /* SLM URB ALL DC  RO  IS   C   T */
 109    {{  0, 32, 48,  0,  0,  0,  0,  0 }},
 110    {{  0, 32,  0,  8, 40,  0,  0,  0 }},
 111    {{  0, 32,  0, 32, 16,  0,  0,  0 }},
 112    {{ 16, 16, 48,  0,  0,  0,  0,  0 }},
 113    {{ 16, 16,  0, 40,  8,  0,  0,  0 }},
 114    {{ 16, 16,  0, 16, 32,  0,  0,  0 }},
 115    {{ 0 }}
 116 };
 117
 118 /**
 119  * CNL validated L3 configurations.  \sa ivb_l3_configs.
 120  */
 121 static const struct gen_l3_config cnl_l3_configs[] = {
 122    /* SLM URB ALL DC  RO  IS   C   T */
 123    {{  0, 64, 64,  0,  0,  0,  0,  0 }},
 124    {{  0, 64,  0, 16, 48,  0,  0,  0 }},
 125    {{  0, 48,  0, 16, 64,  0,  0,  0 }},
 126    {{  0, 32,  0,  0, 96,  0,  0,  0 }},
 127    {{  0, 32, 96,  0,  0,  0,  0,  0 }},
 128    {{  0, 32,  0, 16, 80,  0,  0,  0 }},
 129    {{ 32, 16, 80,  0,  0,  0,  0,  0 }},
 130    {{ 32, 16,  0, 64, 16,  0,  0,  0 }},
 131    {{ 32,  0, 96,  0,  0,  0,  0,  0 }},
 132    {{ 0 }}
 133 };
 134
 135 /**
 136  * ICL validated L3 configurations.  \sa icl_l3_configs.
 137  * Zeroth entry in below table has been commented out intentionally
 138  * due to known issues with this configuration. Many other entries
 139  * suggested by h/w specification aren't added here because they
 140  * do under allocation of L3 cache with below partitioning.
 141  */
 142 static const struct gen_l3_config icl_l3_configs[] = {
 143    /* SLM URB ALL DC  RO  IS   C   T */
 144    /*{{  0, 16, 80,  0,  0,  0,  0,  0 }},*/
 145    {{  0, 32, 64,  0,  0,  0,  0,  0 }},
 146    {{  0 }}
 147 };
 148
 149
 150 /**
 151  * Return a zero-terminated array of validated L3 configurations for the
 152  * specified device.
 153  */
 154 static const struct gen_l3_config *
 155 get_l3_configs(const struct gen_device_info *devinfo)
 156 {
 157    switch (devinfo->gen) {
 158    case 7:
 159       return (devinfo->is_baytrail ? vlv_l3_configs : ivb_l3_configs);
 160
 161    case 8:
 162       return (devinfo->is_cherryview ? chv_l3_configs : bdw_l3_configs);
 163
 164    case 9:
 165       if (devinfo->l3_banks == 1)
 166          return bxt_2x6_l3_configs;
 167       return chv_l3_configs;
 168
 169    case 10:
 170       return cnl_l3_configs;
 171
 172    case 11:
 173    case 12:
 174       return icl_l3_configs;
 175
 176    default:
 177       unreachable("Not implemented");
 178    }
 179 }
 180
 181 /**
 182  * L1-normalize a vector of L3 partition weights.
 183  */
 184 static struct gen_l3_weights
 185 norm_l3_weights(struct gen_l3_weights w)
 186 {
 187    float sz = 0;
 188
 189    for (unsigned i = 0; i < GEN_NUM_L3P; i++)
 190       sz += w.w[i];
 191
 192    for (unsigned i = 0; i < GEN_NUM_L3P; i++)
 193       w.w[i] /= sz;
 194
 195    return w;
 196 }
 197
 198 /**
 199  * Get the relative partition weights of the specified L3 configuration.
 200  */
 201 struct gen_l3_weights
 202 gen_get_l3_config_weights(const struct gen_l3_config *cfg)
 203 {
 204    if (cfg) {
 205       struct gen_l3_weights w;
 206
 207       for (unsigned i = 0; i < GEN_NUM_L3P; i++)
 208          w.w[i] = cfg->n[i];
 209
 210       return norm_l3_weights(w);
 211    } else {
 212       const struct gen_l3_weights w = { { 0 } };
 213       return w;
 214    }
 215 }
 216
 217 /**
 218  * Distance between two L3 configurations represented as vectors of weights.
 219  * Usually just the L1 metric except when the two configurations are
 220  * considered incompatible in which case the distance will be infinite.  Note
 221  * that the compatibility condition is asymmetric -- They will be considered
 222  * incompatible whenever the reference configuration \p w0 requires SLM, DC,
 223  * or URB but \p w1 doesn't provide it.
 224  */
 225 float
 226 gen_diff_l3_weights(struct gen_l3_weights w0, struct gen_l3_weights w1)
 227 {
 228    if ((w0.w[GEN_L3P_SLM] && !w1.w[GEN_L3P_SLM]) ||
 229        (w0.w[GEN_L3P_DC] && !w1.w[GEN_L3P_DC] && !w1.w[GEN_L3P_ALL]) ||
 230        (w0.w[GEN_L3P_URB] && !w1.w[GEN_L3P_URB])) {
 231       return HUGE_VALF;
 232
 233    } else {
 234       float dw = 0;
 235
 236       for (unsigned i = 0; i < GEN_NUM_L3P; i++)
 237          dw += fabs(w0.w[i] - w1.w[i]);
 238
 239       return dw;
 240    }
 241 }
 242
 243 /**
 244  * Return a reasonable default L3 configuration for the specified device based
 245  * on whether SLM and DC are required.  In the non-SLM non-DC case the result
 246  * is intended to approximately resemble the hardware defaults.
 247  */
 248 struct gen_l3_weights
 249 gen_get_default_l3_weights(const struct gen_device_info *devinfo,
 250                            bool needs_dc, bool needs_slm)
 251 {
 252    struct gen_l3_weights w = {{ 0 }};
 253
 254    w.w[GEN_L3P_SLM] = devinfo->gen < 11 && needs_slm;
 255    w.w[GEN_L3P_URB] = 1.0;
 256
 257    if (devinfo->gen >= 8) {
 258       w.w[GEN_L3P_ALL] = 1.0;
 259    } else {
 260       w.w[GEN_L3P_DC] = needs_dc ? 0.1 : 0;
 261       w.w[GEN_L3P_RO] = devinfo->is_baytrail ? 0.5 : 1.0;
 262    }
 263
 264    return norm_l3_weights(w);
 265 }
 266
 267 /**
 268  * Get the default L3 configuration
 269  */
 270 const struct gen_l3_config *
 271 gen_get_default_l3_config(const struct gen_device_info *devinfo)
 272 {
 273    /* For efficiency assume that the first entry of the array matches the
 274     * default configuration.
 275     */
 276    const struct gen_l3_config *const cfg = get_l3_configs(devinfo);
 277    assert(cfg == gen_get_l3_config(devinfo,
 278                     gen_get_default_l3_weights(devinfo, false, false)));
 279    return cfg;
 280 }
 281
 282 /**
 283  * Return the closest validated L3 configuration for the specified device and
 284  * weight vector.
 285  */
 286 const struct gen_l3_config *
 287 gen_get_l3_config(const struct gen_device_info *devinfo,
 288                   struct gen_l3_weights w0)
 289 {
 290    const struct gen_l3_config *const cfgs = get_l3_configs(devinfo);
 291    const struct gen_l3_config *cfg_best = NULL;
 292    float dw_best = HUGE_VALF;
 293
 294    for (const struct gen_l3_config *cfg = cfgs; cfg->n[GEN_L3P_URB]; cfg++) {
 295       const float dw = gen_diff_l3_weights(w0, gen_get_l3_config_weights(cfg));
 296
 297       if (dw < dw_best) {
 298          cfg_best = cfg;
 299          dw_best = dw;
 300       }
 301    }
 302
 303    return cfg_best;
 304 }
 305
 306 /**
 307  * Return the size of an L3 way in KB.
 308  */
 309 static unsigned
 310 get_l3_way_size(const struct gen_device_info *devinfo)
 311 {
 312    const unsigned way_size_per_bank =
 313       (devinfo->gen >= 9 && devinfo->l3_banks == 1) || devinfo->gen == 11 ?
 314       4 : 2;
 315
 316    assert(devinfo->l3_banks);
 317    return way_size_per_bank * devinfo->l3_banks;
 318 }
 319
 320 /**
 321  * Return the unit brw_context::urb::size is expressed in, in KB.  \sa
 322  * gen_device_info::urb::size.
 323  */
 324 static unsigned
 325 get_urb_size_scale(const struct gen_device_info *devinfo)
 326 {
 327    return (devinfo->gen >= 8 ? devinfo->num_slices : 1);
 328 }
 329
 330 unsigned
 331 gen_get_l3_config_urb_size(const struct gen_device_info *devinfo,
 332                            const struct gen_l3_config *cfg)
 333 {
 334    /* From the SKL "L3 Allocation and Programming" documentation:
 335     *
 336     * "URB is limited to 1008KB due to programming restrictions.  This is not
 337     * a restriction of the L3 implementation, but of the FF and other clients.
 338     * Therefore, in a GT4 implementation it is possible for the programmed
 339     * allocation of the L3 data array to provide 3*384KB=1152KB for URB, but
 340     * only 1008KB of this will be used."
 341     */
 342    const unsigned max = (devinfo->gen == 9 ? 1008 : ~0);
 343    return MIN2(max, cfg->n[GEN_L3P_URB] * get_l3_way_size(devinfo)) /
 344           get_urb_size_scale(devinfo);
 345 }
 346
 347 /**
 348  * Print out the specified L3 configuration.
 349  */
 350 void
 351 gen_dump_l3_config(const struct gen_l3_config *cfg, FILE *fp)
 352 {
 353    fprintf(stderr, "SLM=%d URB=%d ALL=%d DC=%d RO=%d IS=%d C=%d T=%d\n",
 354            cfg->n[GEN_L3P_SLM], cfg->n[GEN_L3P_URB], cfg->n[GEN_L3P_ALL],
 355            cfg->n[GEN_L3P_DC], cfg->n[GEN_L3P_RO],
 356            cfg->n[GEN_L3P_IS], cfg->n[GEN_L3P_C], cfg->n[GEN_L3P_T]);
 357 }