kernel/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gk20a.c

   1 /*
   2  * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
   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 shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  19  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  20  * DEALINGS IN THE SOFTWARE.
  21  */
  22 #include "priv.h"
  23
  24 #include <subdev/clk.h>
  25 #include <subdev/timer.h>
  26 #include <subdev/volt.h>
  27
  28 #define BUSY_SLOT       0
  29 #define CLK_SLOT        7
  30
  31 struct gk20a_pmu_dvfs_data {
  32         int p_load_target;
  33         int p_load_max;
  34         int p_smooth;
  35         unsigned int avg_load;
  36 };
  37
  38 struct gk20a_pmu_priv {
  39         struct nvkm_pmu base;
  40         struct nvkm_alarm alarm;
  41         struct gk20a_pmu_dvfs_data *data;
  42 };
  43
  44 struct gk20a_pmu_dvfs_dev_status {
  45         unsigned long total;
  46         unsigned long busy;
  47         int cur_state;
  48 };
  49
  50 static int
  51 gk20a_pmu_dvfs_target(struct gk20a_pmu_priv *priv, int *state)
  52 {
  53         struct nvkm_clk *clk = nvkm_clk(priv);
  54
  55         return nvkm_clk_astate(clk, *state, 0, false);
  56 }
  57
  58 static int
  59 gk20a_pmu_dvfs_get_cur_state(struct gk20a_pmu_priv *priv, int *state)
  60 {
  61         struct nvkm_clk *clk = nvkm_clk(priv);
  62
  63         *state = clk->pstate;
  64         return 0;
  65 }
  66
  67 static int
  68 gk20a_pmu_dvfs_get_target_state(struct gk20a_pmu_priv *priv,
  69                                 int *state, int load)
  70 {
  71         struct gk20a_pmu_dvfs_data *data = priv->data;
  72         struct nvkm_clk *clk = nvkm_clk(priv);
  73         int cur_level, level;
  74
  75         /* For GK20A, the performance level is directly mapped to pstate */
  76         level = cur_level = clk->pstate;
  77
  78         if (load > data->p_load_max) {
  79                 level = min(clk->state_nr - 1, level + (clk->state_nr / 3));
  80         } else {
  81                 level += ((load - data->p_load_target) * 10 /
  82                                 data->p_load_target) / 2;
  83                 level = max(0, level);
  84                 level = min(clk->state_nr - 1, level);
  85         }
  86
  87         nv_trace(priv, "cur level = %d, new level = %d\n", cur_level, level);
  88
  89         *state = level;
  90
  91         if (level == cur_level)
  92                 return 0;
  93         else
  94                 return 1;
  95 }
  96
  97 static int
  98 gk20a_pmu_dvfs_get_dev_status(struct gk20a_pmu_priv *priv,
  99                               struct gk20a_pmu_dvfs_dev_status *status)
 100 {
 101         status->busy = nv_rd32(priv, 0x10a508 + (BUSY_SLOT * 0x10));
 102         status->total= nv_rd32(priv, 0x10a508 + (CLK_SLOT * 0x10));
 103         return 0;
 104 }
 105
 106 static void
 107 gk20a_pmu_dvfs_reset_dev_status(struct gk20a_pmu_priv *priv)
 108 {
 109         nv_wr32(priv, 0x10a508 + (BUSY_SLOT * 0x10), 0x80000000);
 110         nv_wr32(priv, 0x10a508 + (CLK_SLOT * 0x10), 0x80000000);
 111 }
 112
 113 static void
 114 gk20a_pmu_dvfs_work(struct nvkm_alarm *alarm)
 115 {
 116         struct gk20a_pmu_priv *priv =
 117                 container_of(alarm, struct gk20a_pmu_priv, alarm);
 118         struct gk20a_pmu_dvfs_data *data = priv->data;
 119         struct gk20a_pmu_dvfs_dev_status status;
 120         struct nvkm_clk *clk = nvkm_clk(priv);
 121         struct nvkm_volt *volt = nvkm_volt(priv);
 122         u32 utilization = 0;
 123         int state, ret;
 124
 125         /*
 126          * The PMU is initialized before CLK and VOLT, so we have to make sure the
 127          * CLK and VOLT are ready here.
 128          */
 129         if (!clk || !volt)
 130                 goto resched;
 131
 132         ret = gk20a_pmu_dvfs_get_dev_status(priv, &status);
 133         if (ret) {
 134                 nv_warn(priv, "failed to get device status\n");
 135                 goto resched;
 136         }
 137
 138         if (status.total)
 139                 utilization = div_u64((u64)status.busy * 100, status.total);
 140
 141         data->avg_load = (data->p_smooth * data->avg_load) + utilization;
 142         data->avg_load /= data->p_smooth + 1;
 143         nv_trace(priv, "utilization = %d %%, avg_load = %d %%\n",
 144                         utilization, data->avg_load);
 145
 146         ret = gk20a_pmu_dvfs_get_cur_state(priv, &state);
 147         if (ret) {
 148                 nv_warn(priv, "failed to get current state\n");
 149                 goto resched;
 150         }
 151
 152         if (gk20a_pmu_dvfs_get_target_state(priv, &state, data->avg_load)) {
 153                 nv_trace(priv, "set new state to %d\n", state);
 154                 gk20a_pmu_dvfs_target(priv, &state);
 155         }
 156
 157 resched:
 158         gk20a_pmu_dvfs_reset_dev_status(priv);
 159         nvkm_timer_alarm(priv, 100000000, alarm);
 160 }
 161
 162 static int
 163 gk20a_pmu_fini(struct nvkm_object *object, bool suspend)
 164 {
 165         struct nvkm_pmu *pmu = (void *)object;
 166         struct gk20a_pmu_priv *priv = (void *)pmu;
 167
 168         nvkm_timer_alarm_cancel(priv, &priv->alarm);
 169
 170         return nvkm_subdev_fini(&pmu->base, suspend);
 171 }
 172
 173 static int
 174 gk20a_pmu_init(struct nvkm_object *object)
 175 {
 176         struct nvkm_pmu *pmu = (void *)object;
 177         struct gk20a_pmu_priv *priv = (void *)pmu;
 178         int ret;
 179
 180         ret = nvkm_subdev_init(&pmu->base);
 181         if (ret)
 182                 return ret;
 183
 184         pmu->pgob = nvkm_pmu_pgob;
 185
 186         /* init pwr perf counter */
 187         nv_wr32(pmu, 0x10a504 + (BUSY_SLOT * 0x10), 0x00200001);
 188         nv_wr32(pmu, 0x10a50c + (BUSY_SLOT * 0x10), 0x00000002);
 189         nv_wr32(pmu, 0x10a50c + (CLK_SLOT * 0x10), 0x00000003);
 190
 191         nvkm_timer_alarm(pmu, 2000000000, &priv->alarm);
 192         return ret;
 193 }
 194
 195 static struct gk20a_pmu_dvfs_data
 196 gk20a_dvfs_data= {
 197         .p_load_target = 70,
 198         .p_load_max = 90,
 199         .p_smooth = 1,
 200 };
 201
 202 static int
 203 gk20a_pmu_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
 204                struct nvkm_oclass *oclass, void *data, u32 size,
 205                struct nvkm_object **pobject)
 206 {
 207         struct gk20a_pmu_priv *priv;
 208         int ret;
 209
 210         ret = nvkm_pmu_create(parent, engine, oclass, &priv);
 211         *pobject = nv_object(priv);
 212         if (ret)
 213                 return ret;
 214
 215         priv->data = &gk20a_dvfs_data;
 216
 217         nvkm_alarm_init(&priv->alarm, gk20a_pmu_dvfs_work);
 218         return 0;
 219 }
 220
 221 struct nvkm_oclass *
 222 gk20a_pmu_oclass = &(struct nvkm_pmu_impl) {
 223         .base.handle = NV_SUBDEV(PMU, 0xea),
 224         .base.ofuncs = &(struct nvkm_ofuncs) {
 225                 .ctor = gk20a_pmu_ctor,
 226                 .dtor = _nvkm_pmu_dtor,
 227                 .init = gk20a_pmu_init,
 228                 .fini = gk20a_pmu_fini,
 229         },
 230 }.base;