--- /dev/null
+/*
+ * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
+ *
+ * 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 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 AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+#include "priv.h"
+
+#include <subdev/clk.h>
+#include <subdev/timer.h>
+#include <subdev/volt.h>
+
+#define BUSY_SLOT 0
+#define CLK_SLOT 7
+
+struct gk20a_pmu_dvfs_data {
+ int p_load_target;
+ int p_load_max;
+ int p_smooth;
+ unsigned int avg_load;
+};
+
+struct gk20a_pmu_priv {
+ struct nvkm_pmu base;
+ struct nvkm_alarm alarm;
+ struct gk20a_pmu_dvfs_data *data;
+};
+
+struct gk20a_pmu_dvfs_dev_status {
+ unsigned long total;
+ unsigned long busy;
+ int cur_state;
+};
+
+static int
+gk20a_pmu_dvfs_target(struct gk20a_pmu_priv *priv, int *state)
+{
+ struct nvkm_clk *clk = nvkm_clk(priv);
+
+ return nvkm_clk_astate(clk, *state, 0, false);
+}
+
+static int
+gk20a_pmu_dvfs_get_cur_state(struct gk20a_pmu_priv *priv, int *state)
+{
+ struct nvkm_clk *clk = nvkm_clk(priv);
+
+ *state = clk->pstate;
+ return 0;
+}
+
+static int
+gk20a_pmu_dvfs_get_target_state(struct gk20a_pmu_priv *priv,
+ int *state, int load)
+{
+ struct gk20a_pmu_dvfs_data *data = priv->data;
+ struct nvkm_clk *clk = nvkm_clk(priv);
+ int cur_level, level;
+
+ /* For GK20A, the performance level is directly mapped to pstate */
+ level = cur_level = clk->pstate;
+
+ if (load > data->p_load_max) {
+ level = min(clk->state_nr - 1, level + (clk->state_nr / 3));
+ } else {
+ level += ((load - data->p_load_target) * 10 /
+ data->p_load_target) / 2;
+ level = max(0, level);
+ level = min(clk->state_nr - 1, level);
+ }
+
+ nv_trace(priv, "cur level = %d, new level = %d\n", cur_level, level);
+
+ *state = level;
+
+ if (level == cur_level)
+ return 0;
+ else
+ return 1;
+}
+
+static int
+gk20a_pmu_dvfs_get_dev_status(struct gk20a_pmu_priv *priv,
+ struct gk20a_pmu_dvfs_dev_status *status)
+{
+ status->busy = nv_rd32(priv, 0x10a508 + (BUSY_SLOT * 0x10));
+ status->total= nv_rd32(priv, 0x10a508 + (CLK_SLOT * 0x10));
+ return 0;
+}
+
+static void
+gk20a_pmu_dvfs_reset_dev_status(struct gk20a_pmu_priv *priv)
+{
+ nv_wr32(priv, 0x10a508 + (BUSY_SLOT * 0x10), 0x80000000);
+ nv_wr32(priv, 0x10a508 + (CLK_SLOT * 0x10), 0x80000000);
+}
+
+static void
+gk20a_pmu_dvfs_work(struct nvkm_alarm *alarm)
+{
+ struct gk20a_pmu_priv *priv =
+ container_of(alarm, struct gk20a_pmu_priv, alarm);
+ struct gk20a_pmu_dvfs_data *data = priv->data;
+ struct gk20a_pmu_dvfs_dev_status status;
+ struct nvkm_clk *clk = nvkm_clk(priv);
+ struct nvkm_volt *volt = nvkm_volt(priv);
+ u32 utilization = 0;
+ int state, ret;
+
+ /*
+ * The PMU is initialized before CLK and VOLT, so we have to make sure the
+ * CLK and VOLT are ready here.
+ */
+ if (!clk || !volt)
+ goto resched;
+
+ ret = gk20a_pmu_dvfs_get_dev_status(priv, &status);
+ if (ret) {
+ nv_warn(priv, "failed to get device status\n");
+ goto resched;
+ }
+
+ if (status.total)
+ utilization = div_u64((u64)status.busy * 100, status.total);
+
+ data->avg_load = (data->p_smooth * data->avg_load) + utilization;
+ data->avg_load /= data->p_smooth + 1;
+ nv_trace(priv, "utilization = %d %%, avg_load = %d %%\n",
+ utilization, data->avg_load);
+
+ ret = gk20a_pmu_dvfs_get_cur_state(priv, &state);
+ if (ret) {
+ nv_warn(priv, "failed to get current state\n");
+ goto resched;
+ }
+
+ if (gk20a_pmu_dvfs_get_target_state(priv, &state, data->avg_load)) {
+ nv_trace(priv, "set new state to %d\n", state);
+ gk20a_pmu_dvfs_target(priv, &state);
+ }
+
+resched:
+ gk20a_pmu_dvfs_reset_dev_status(priv);
+ nvkm_timer_alarm(priv, 100000000, alarm);
+}
+
+static int
+gk20a_pmu_fini(struct nvkm_object *object, bool suspend)
+{
+ struct nvkm_pmu *pmu = (void *)object;
+ struct gk20a_pmu_priv *priv = (void *)pmu;
+
+ nvkm_timer_alarm_cancel(priv, &priv->alarm);
+
+ return nvkm_subdev_fini(&pmu->base, suspend);
+}
+
+static int
+gk20a_pmu_init(struct nvkm_object *object)
+{
+ struct nvkm_pmu *pmu = (void *)object;
+ struct gk20a_pmu_priv *priv = (void *)pmu;
+ int ret;
+
+ ret = nvkm_subdev_init(&pmu->base);
+ if (ret)
+ return ret;
+
+ pmu->pgob = nvkm_pmu_pgob;
+
+ /* init pwr perf counter */
+ nv_wr32(pmu, 0x10a504 + (BUSY_SLOT * 0x10), 0x00200001);
+ nv_wr32(pmu, 0x10a50c + (BUSY_SLOT * 0x10), 0x00000002);
+ nv_wr32(pmu, 0x10a50c + (CLK_SLOT * 0x10), 0x00000003);
+
+ nvkm_timer_alarm(pmu, 2000000000, &priv->alarm);
+ return ret;
+}
+
+static struct gk20a_pmu_dvfs_data
+gk20a_dvfs_data= {
+ .p_load_target = 70,
+ .p_load_max = 90,
+ .p_smooth = 1,
+};
+
+static int
+gk20a_pmu_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
+ struct nvkm_oclass *oclass, void *data, u32 size,
+ struct nvkm_object **pobject)
+{
+ struct gk20a_pmu_priv *priv;
+ int ret;
+
+ ret = nvkm_pmu_create(parent, engine, oclass, &priv);
+ *pobject = nv_object(priv);
+ if (ret)
+ return ret;
+
+ priv->data = &gk20a_dvfs_data;
+
+ nvkm_alarm_init(&priv->alarm, gk20a_pmu_dvfs_work);
+ return 0;
+}
+
+struct nvkm_oclass *
+gk20a_pmu_oclass = &(struct nvkm_pmu_impl) {
+ .base.handle = NV_SUBDEV(PMU, 0xea),
+ .base.ofuncs = &(struct nvkm_ofuncs) {
+ .ctor = gk20a_pmu_ctor,
+ .dtor = _nvkm_pmu_dtor,
+ .init = gk20a_pmu_init,
+ .fini = gk20a_pmu_fini,
+ },
+}.base;
Code Review / kvmfornfv.git / blobdiff