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; 231