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/*
* 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.
*/
#define gk20a_pmu(p) container_of((p), struct gk20a_pmu, base)
#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 {
struct nvkm_pmu base;
struct nvkm_alarm alarm;
struct gk20a_pmu_dvfs_data *data;
};
struct gk20a_pmu_dvfs_dev_status {
u32 total;
u32 busy;
};
static int
gk20a_pmu_dvfs_target(struct gk20a_pmu *pmu, int *state)
{
struct nvkm_clk *clk = pmu->base.subdev.device->clk;
return nvkm_clk_astate(clk, *state, 0, false);
}
static void
gk20a_pmu_dvfs_get_cur_state(struct gk20a_pmu *pmu, int *state)
{
struct nvkm_clk *clk = pmu->base.subdev.device->clk;
*state = clk->pstate;
}
static int
gk20a_pmu_dvfs_get_target_state(struct gk20a_pmu *pmu,
int *state, int load)
{
struct gk20a_pmu_dvfs_data *data = pmu->data;
struct nvkm_clk *clk = pmu->base.subdev.device->clk;
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);
}
nvkm_trace(&pmu->base.subdev, "cur level = %d, new level = %d\n",
cur_level, level);
*state = level;
return (level != cur_level);
}
static void
gk20a_pmu_dvfs_get_dev_status(struct gk20a_pmu *pmu,
struct gk20a_pmu_dvfs_dev_status *status)
{
struct nvkm_falcon *falcon = pmu->base.falcon;
status->busy = nvkm_falcon_rd32(falcon, 0x508 + (BUSY_SLOT * 0x10));
status->total= nvkm_falcon_rd32(falcon, 0x508 + (CLK_SLOT * 0x10));
}
static void
gk20a_pmu_dvfs_reset_dev_status(struct gk20a_pmu *pmu)
{
struct nvkm_falcon *falcon = pmu->base.falcon;
nvkm_falcon_wr32(falcon, 0x508 + (BUSY_SLOT * 0x10), 0x80000000);
nvkm_falcon_wr32(falcon, 0x508 + (CLK_SLOT * 0x10), 0x80000000);
}
static void
gk20a_pmu_dvfs_work(struct nvkm_alarm *alarm)
{
struct gk20a_pmu *pmu =
container_of(alarm, struct gk20a_pmu, alarm);
struct gk20a_pmu_dvfs_data *data = pmu->data;
struct gk20a_pmu_dvfs_dev_status status;
struct nvkm_subdev *subdev = &pmu->base.subdev;
struct nvkm_device *device = subdev->device;
struct nvkm_clk *clk = device->clk;
struct nvkm_timer *tmr = device->timer;
struct nvkm_volt *volt = device->volt;
u32 utilization = 0;
int state;
/*
* 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;
gk20a_pmu_dvfs_get_dev_status(pmu, &status);
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;
nvkm_trace(subdev, "utilization = %d %%, avg_load = %d %%\n",
utilization, data->avg_load);
gk20a_pmu_dvfs_get_cur_state(pmu, &state);
if (gk20a_pmu_dvfs_get_target_state(pmu, &state, data->avg_load)) {
nvkm_trace(subdev, "set new state to %d\n", state);
gk20a_pmu_dvfs_target(pmu, &state);
}
resched:
gk20a_pmu_dvfs_reset_dev_status(pmu);
nvkm_timer_alarm(tmr, 100000000, alarm);
}
static void
gk20a_pmu_fini(struct nvkm_pmu *pmu)
{
struct gk20a_pmu *gpmu = gk20a_pmu(pmu);
nvkm_timer_alarm(pmu->subdev.device->timer, 0, &gpmu->alarm);
nvkm_falcon_put(pmu->falcon, &pmu->subdev);
}
static int
gk20a_pmu_init(struct nvkm_pmu *pmu)
{
struct gk20a_pmu *gpmu = gk20a_pmu(pmu);
struct nvkm_subdev *subdev = &pmu->subdev;
struct nvkm_device *device = pmu->subdev.device;
struct nvkm_falcon *falcon = pmu->falcon;
int ret;
ret = nvkm_falcon_get(falcon, subdev);
if (ret) {
nvkm_error(subdev, "cannot acquire %s falcon!\n", falcon->name);
return ret;
}
/* init pwr perf counter */
nvkm_falcon_wr32(falcon, 0x504 + (BUSY_SLOT * 0x10), 0x00200001);
nvkm_falcon_wr32(falcon, 0x50c + (BUSY_SLOT * 0x10), 0x00000002);
nvkm_falcon_wr32(falcon, 0x50c + (CLK_SLOT * 0x10), 0x00000003);
nvkm_timer_alarm(device->timer, 2000000000, &gpmu->alarm);
return 0;
}
static struct gk20a_pmu_dvfs_data
gk20a_dvfs_data= {
.p_load_target = 70,
.p_load_max = 90,
.p_smooth = 1,
};
static const struct nvkm_pmu_func
gk20a_pmu = {
.init = gk20a_pmu_init,
.fini = gk20a_pmu_fini,
.reset = gt215_pmu_reset,
};
int
gk20a_pmu_new(struct nvkm_device *device, int index, struct nvkm_pmu **ppmu)
{
struct gk20a_pmu *pmu;
if (!(pmu = kzalloc(sizeof(*pmu), GFP_KERNEL)))
return -ENOMEM;
*ppmu = &pmu->base;
nvkm_pmu_ctor(&gk20a_pmu, device, index, &pmu->base);
pmu->data = &gk20a_dvfs_data;
nvkm_alarm_init(&pmu->alarm, gk20a_pmu_dvfs_work);
return 0;
}
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