[Nouveau] [RFC PATCH 2/3] dvfs: add support for GK20A
Ben Skeggs
skeggsb at gmail.com
Thu Dec 18 01:34:49 PST 2014
On Thu, Dec 18, 2014 at 4:28 PM, Vince Hsu <vinceh at nvidia.com> wrote:
> This patch creates a subdev for DVFS (Dynamic Voltage and Frequency Scaling)
> support in Nouveau. This subdev refers to the status information provided by
> the NVIDIA hardware and tries to adjust the performance level based on the
> calculated target. Only the GK20A is supported right now.
Hey Vince,
I'd not make a new subdev, but implement this in the PMU (PWR
currently) subdev. The ucode that's supposed to be running there can
do the performance monitoring in a more complex implementation, and
it's PMU counters you're touching to get the usage stats :) But the
simpler on-host implementation is totally fine.
The current base PMU implementation tries to do a lot of stuff that
you don't need, just override the implementation entirely for GK20A
for now if that's easier than reworking it.
Aside from the subdev move, it looks good so far to me. Glad to see
the CLK stuff isn't totally useless, despite it needing a *lot* of
work.
Thanks,
Ben.
>
> Signed-off-by: Vince Hsu <vinceh at nvidia.com>
> ---
> drm/Kbuild | 2 +
> drm/core/include/subdev/dvfs.h | 1 +
> drm/core/subdev/dvfs/base.c | 1 +
> drm/core/subdev/dvfs/gk20a.c | 1 +
> drm/core/subdev/dvfs/priv.h | 1 +
> nvkm/engine/device/nve0.c | 2 +
> nvkm/include/core/device.h | 1 +
> nvkm/include/subdev/dvfs.h | 30 ++++++++
> nvkm/subdev/Makefile.am | 5 +-
> nvkm/subdev/dvfs/Makefile.am | 6 ++
> nvkm/subdev/dvfs/base.c | 129 ++++++++++++++++++++++++++++++++++
> nvkm/subdev/dvfs/gk20a.c | 156 +++++++++++++++++++++++++++++++++++++++++
> nvkm/subdev/dvfs/priv.h | 43 ++++++++++++
> 13 files changed, 376 insertions(+), 2 deletions(-)
> create mode 120000 drm/core/include/subdev/dvfs.h
> create mode 120000 drm/core/subdev/dvfs/base.c
> create mode 120000 drm/core/subdev/dvfs/gk20a.c
> create mode 120000 drm/core/subdev/dvfs/priv.h
> create mode 100644 nvkm/include/subdev/dvfs.h
> create mode 100644 nvkm/subdev/dvfs/Makefile.am
> create mode 100644 nvkm/subdev/dvfs/base.c
> create mode 100644 nvkm/subdev/dvfs/gk20a.c
> create mode 100644 nvkm/subdev/dvfs/priv.h
>
> diff --git a/drm/Kbuild b/drm/Kbuild
> index 061d9faef836..e7eb05e666a0 100644
> --- a/drm/Kbuild
> +++ b/drm/Kbuild
> @@ -227,6 +227,8 @@ nouveau-y += core/subdev/volt/base.o
> nouveau-y += core/subdev/volt/gpio.o
> nouveau-y += core/subdev/volt/nv40.o
> nouveau-y += core/subdev/volt/gk20a.o
> +nouveau-y += core/subdev/dvfs/base.o
> +nouveau-y += core/subdev/dvfs/gk20a.o
>
> nouveau-y += core/engine/falcon.o
> nouveau-y += core/engine/xtensa.o
> diff --git a/drm/core/include/subdev/dvfs.h b/drm/core/include/subdev/dvfs.h
> new file mode 120000
> index 000000000000..553a6968350b
> --- /dev/null
> +++ b/drm/core/include/subdev/dvfs.h
> @@ -0,0 +1 @@
> +../../../../nvkm/include/subdev/dvfs.h
> \ No newline at end of file
> diff --git a/drm/core/subdev/dvfs/base.c b/drm/core/subdev/dvfs/base.c
> new file mode 120000
> index 000000000000..296334ee52d1
> --- /dev/null
> +++ b/drm/core/subdev/dvfs/base.c
> @@ -0,0 +1 @@
> +../../../../nvkm/subdev/dvfs/base.c
> \ No newline at end of file
> diff --git a/drm/core/subdev/dvfs/gk20a.c b/drm/core/subdev/dvfs/gk20a.c
> new file mode 120000
> index 000000000000..d05d493e3fc9
> --- /dev/null
> +++ b/drm/core/subdev/dvfs/gk20a.c
> @@ -0,0 +1 @@
> +../../../../nvkm/subdev/dvfs/gk20a.c
> \ No newline at end of file
> diff --git a/drm/core/subdev/dvfs/priv.h b/drm/core/subdev/dvfs/priv.h
> new file mode 120000
> index 000000000000..9b471dc44f48
> --- /dev/null
> +++ b/drm/core/subdev/dvfs/priv.h
> @@ -0,0 +1 @@
> +../../../../nvkm/subdev/dvfs/priv.h
> \ No newline at end of file
> diff --git a/nvkm/engine/device/nve0.c b/nvkm/engine/device/nve0.c
> index ba7922d31351..5a830a37a15d 100644
> --- a/nvkm/engine/device/nve0.c
> +++ b/nvkm/engine/device/nve0.c
> @@ -41,6 +41,7 @@
> #include <subdev/bar.h>
> #include <subdev/pwr.h>
> #include <subdev/volt.h>
> +#include <subdev/dvfs.h>
>
> #include <engine/device.h>
> #include <engine/dmaobj.h>
> @@ -180,6 +181,7 @@ nve0_identify(struct nouveau_device *device)
> device->oclass[NVDEV_ENGINE_COPY2 ] = &nve0_copy2_oclass;
> device->oclass[NVDEV_ENGINE_PERFMON] = &gk20a_perfmon_oclass;
> device->oclass[NVDEV_SUBDEV_VOLT ] = &gk20a_volt_oclass;
> + device->oclass[NVDEV_SUBDEV_DVFS ] = gk20a_dvfs_oclass;
> break;
> case 0xf0:
> device->cname = "GK110";
> diff --git a/nvkm/include/core/device.h b/nvkm/include/core/device.h
> index 2ec2e50d3676..162fa6a3cfcc 100644
> --- a/nvkm/include/core/device.h
> +++ b/nvkm/include/core/device.h
> @@ -39,6 +39,7 @@ enum nv_subdev_type {
> NVDEV_SUBDEV_VOLT,
> NVDEV_SUBDEV_THERM,
> NVDEV_SUBDEV_CLOCK,
> + NVDEV_SUBDEV_DVFS,
>
> NVDEV_ENGINE_FIRST,
> NVDEV_ENGINE_DMAOBJ = NVDEV_ENGINE_FIRST,
> diff --git a/nvkm/include/subdev/dvfs.h b/nvkm/include/subdev/dvfs.h
> new file mode 100644
> index 000000000000..3851629a0de4
> --- /dev/null
> +++ b/nvkm/include/subdev/dvfs.h
> @@ -0,0 +1,30 @@
> +#ifndef __NOUVEAU_DVFS_H__
> +#define __NOUVEAU_DVFS_H__
> +
> +#include <core/subdev.h>
> +#include <core/device.h>
> +
> +#include <subdev/timer.h>
> +
> +struct nouveau_dvfs_data {
> + int p_load_target;
> + int p_load_max;
> + int p_smooth;
> + unsigned int avg_load;
> +};
> +
> +struct nouveau_dvfs {
> + struct nouveau_subdev base;
> + struct nouveau_alarm alarm;
> + struct nouveau_dvfs_data *data;
> +};
> +
> +static inline struct nouveau_dvfs *
> +nouveau_dvfs(void *obj)
> +{
> + return (void *)nv_device(obj)->subdev[NVDEV_SUBDEV_DVFS];
> +}
> +
> +extern struct nouveau_oclass *gk20a_dvfs_oclass;
> +
> +#endif
> diff --git a/nvkm/subdev/Makefile.am b/nvkm/subdev/Makefile.am
> index 5a48ddb87981..3d11e0833032 100644
> --- a/nvkm/subdev/Makefile.am
> +++ b/nvkm/subdev/Makefile.am
> @@ -1,5 +1,5 @@
> SUBDIRS = bar bus bios clock devinit fb fuse gpio i2c ibus instmem \
> - ltc mc mxm pwr therm timer vm volt
> + ltc mc mxm pwr therm timer vm volt dvfs
>
> noinst_LTLIBRARIES = libsubdev.la
>
> @@ -22,4 +22,5 @@ libsubdev_la_LIBADD = bar/libbar.la \
> therm/libtherm.la \
> timer/libtimer.la \
> vm/libvm.la \
> - volt/libvolt.la
> + volt/libvolt.la \
> + dvfs/dvfs.la
> diff --git a/nvkm/subdev/dvfs/Makefile.am b/nvkm/subdev/dvfs/Makefile.am
> new file mode 100644
> index 000000000000..c09d4ec4124d
> --- /dev/null
> +++ b/nvkm/subdev/dvfs/Makefile.am
> @@ -0,0 +1,6 @@
> +noinst_LTLIBRARIES = libdvfs.la
> +
> +libdvfs_la_SOURCES = base.c \
> + gk20a.c
> +
> +include $(srcdir)/../Makefile.subdev
> diff --git a/nvkm/subdev/dvfs/base.c b/nvkm/subdev/dvfs/base.c
> new file mode 100644
> index 000000000000..88ae201840a8
> --- /dev/null
> +++ b/nvkm/subdev/dvfs/base.c
> @@ -0,0 +1,129 @@
> +/*
> + * 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 <core/option.h>
> +
> +#include <subdev/clock.h>
> +#include <subdev/dvfs.h>
> +#include <subdev/volt.h>
> +
> +#include "priv.h"
> +
> +static void
> +_nouveau_dvfs_work(struct nouveau_alarm *alarm)
> +{
> + struct nouveau_dvfs *dvfs = container_of(alarm, struct nouveau_dvfs,
> + alarm);
> + struct nouveau_dvfs_data *data = dvfs->data;
> + struct nouveau_object *object = nv_object(dvfs);
> + struct nouveau_dvfs_impl *impl = (void *)object->oclass;
> + struct nouveau_dvfs_dev_status status;
> + u32 utilization = 0;
> + int state, ret;
> +
> + ret = impl->get_dev_status(dvfs, &status);
> + if (ret) {
> + nv_warn(dvfs, "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(dvfs, "utilization = %d %%, avg_load = %d %%\n",
> + utilization, data->avg_load);
> +
> + ret = impl->get_cur_state(dvfs, &state);
> + if (ret) {
> + nv_warn(dvfs, "failed to get current state\n");
> + goto resched;
> + }
> +
> + if (impl->get_target_state(dvfs, &state, data->avg_load)) {
> + nv_trace(dvfs, "set new state to %d\n", state);
> + impl->target(dvfs, &state);
> + }
> +
> +resched:
> + impl->reset_dev_status(dvfs);
> + nouveau_timer_alarm(dvfs, 100000000, alarm);
> +}
> +
> +int
> +_nouveau_dvfs_fini(struct nouveau_object *object, bool suspend)
> +{
> + struct nouveau_dvfs *dvfs = (void *)object;
> +
> + nouveau_timer_alarm_cancel(dvfs, &dvfs->alarm);
> +
> + return nouveau_subdev_fini(&dvfs->base, suspend);
> +}
> +
> +int
> +_nouveau_dvfs_init(struct nouveau_object *object)
> +{
> + struct nouveau_dvfs *dvfs = (void *)object;
> + struct nouveau_clock *clk = nouveau_clock(object);
> + struct nouveau_volt *volt = nouveau_volt(object);
> + int ret;
> +
> + ret = nouveau_subdev_init(&dvfs->base);
> + if (ret)
> + return ret;
> +
> + if (!clk || !volt)
> + return -EINVAL;
> +
> + nouveau_timer_alarm(dvfs, 2000000000, &dvfs->alarm);
> +
> + return 0;
> +}
> +
> +void
> +_nouveau_dvfs_dtor(struct nouveau_object *object)
> +{
> + struct nouveau_dvfs *dvfs = (void *)object;
> +
> + nouveau_subdev_destroy(&dvfs->base);
> +}
> +
> +int
> +nouveau_dvfs_create_(struct nouveau_object *parent,
> + struct nouveau_object *engine,
> + struct nouveau_oclass *oclass,
> + int size, void **pobject)
> +{
> + struct nouveau_dvfs *dvfs;
> + int ret;
> +
> + ret = nouveau_subdev_create_(parent, engine, oclass, 0, "DVFS",
> + "dvfs", size, pobject);
> + dvfs = *pobject;
> + if (ret)
> + return ret;
> +
> + nouveau_alarm_init(&dvfs->alarm, _nouveau_dvfs_work);
> +
> + return 0;
> +}
> diff --git a/nvkm/subdev/dvfs/gk20a.c b/nvkm/subdev/dvfs/gk20a.c
> new file mode 100644
> index 000000000000..efebd2c10f99
> --- /dev/null
> +++ b/nvkm/subdev/dvfs/gk20a.c
> @@ -0,0 +1,156 @@
> +/*
> + * 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 <subdev/clock.h>
> +#include <subdev/dvfs.h>
> +#include <subdev/volt.h>
> +
> +#include "priv.h"
> +
> +#define BUSY_SLOT 0
> +#define CLK_SLOT 7
> +
> +struct gk20a_dvfs_priv {
> + struct nouveau_dvfs base;
> +};
> +
> +static int
> +gk20a_dvfs_target(struct nouveau_dvfs *dvfs, int *state)
> +{
> + struct nouveau_clock *clk = nouveau_clock(dvfs);
> +
> + return nouveau_clock_astate(clk, *state, 0, false);
> +}
> +
> +static int
> +gk20a_dvfs_get_cur_state(struct nouveau_dvfs *dvfs, int *state)
> +{
> + struct nouveau_clock *clk = nouveau_clock(dvfs);
> +
> + *state = clk->pstate;
> + return 0;
> +}
> +
> +static int
> +gk20a_dvfs_get_target_state(struct nouveau_dvfs *dvfs, int *state, int load)
> +{
> + struct nouveau_dvfs_data *data = dvfs->data;
> + struct nouveau_clock *clk = nouveau_clock(dvfs);
> + 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(dvfs, "cur level = %d, new level = %d\n", cur_level, level);
> +
> + *state = level;
> +
> + if (level == cur_level)
> + return 0;
> + else
> + return 1;
> +}
> +
> +static int
> +gk20a_dvfs_get_dev_status(struct nouveau_dvfs *dvfs,
> + struct nouveau_dvfs_dev_status *status)
> +{
> + status->busy = nv_rd32(dvfs, 0x10a508 + (BUSY_SLOT * 0x10));
> + status->total= nv_rd32(dvfs, 0x10a508 + (CLK_SLOT * 0x10));
> + return 0;
> +}
> +
> +static void
> +gk20a_dvfs_reset_dev_status(struct nouveau_dvfs *dvfs)
> +{
> + nv_wr32(dvfs, 0x10a508 + (BUSY_SLOT * 0x10), 0x80000000);
> + nv_wr32(dvfs, 0x10a508 + (CLK_SLOT * 0x10), 0x80000000);
> +}
> +
> +static int
> +gk20a_dvfs_init(struct nouveau_object *object)
> +{
> + struct gk20a_dvfs_priv *priv = (void *)object;
> + int ret;
> +
> + /* init pwr perf counter */
> + nv_wr32(priv, 0x10a504 + (BUSY_SLOT * 0x10), 0x00200001);
> + nv_wr32(priv, 0x10a50c + (BUSY_SLOT * 0x10), 0x00000002);
> + nv_wr32(priv, 0x10a50c + (CLK_SLOT * 0x10), 0x00000003);
> +
> + ret = nouveau_dvfs_init(&priv->base);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +struct nouveau_dvfs_data gk20a_dvfs_data = {
> + .p_load_target = 70,
> + .p_load_max = 90,
> + .p_smooth = 1,
> +};
> +
> +static int
> +gk20a_dvfs_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
> + struct nouveau_oclass *oclass, void *data, u32 size,
> + struct nouveau_object **pobject)
> +{
> + struct gk20a_dvfs_priv *priv;
> + struct nouveau_dvfs *dvfs;
> + int ret;
> +
> + ret = nouveau_dvfs_create(parent, engine, oclass, &priv);
> + *pobject = nv_object(priv);
> + if (ret)
> + return ret;
> +
> + dvfs = &priv->base;
> + dvfs->data = &gk20a_dvfs_data;
> +
> + return 0;
> +}
> +
> +struct nouveau_oclass *
> +gk20a_dvfs_oclass = &(struct nouveau_dvfs_impl) {
> + .base.handle = NV_SUBDEV(DVFS, 0xea),
> + .base.ofuncs = &(struct nouveau_ofuncs) {
> + .ctor = gk20a_dvfs_ctor,
> + .dtor = _nouveau_dvfs_dtor,
> + .init = gk20a_dvfs_init,
> + .fini = _nouveau_dvfs_fini,
> + },
> + .get_dev_status = gk20a_dvfs_get_dev_status,
> + .reset_dev_status = gk20a_dvfs_reset_dev_status,
> + .target = gk20a_dvfs_target,
> + .get_cur_state = gk20a_dvfs_get_cur_state,
> + .get_target_state = gk20a_dvfs_get_target_state,
> +}.base;
> diff --git a/nvkm/subdev/dvfs/priv.h b/nvkm/subdev/dvfs/priv.h
> new file mode 100644
> index 000000000000..95c8a00a01c1
> --- /dev/null
> +++ b/nvkm/subdev/dvfs/priv.h
> @@ -0,0 +1,43 @@
> +#ifndef __NVKM_DVFS_PRIV_H__
> +#define __NVKM_DVFS_PRIV_H__
> +
> +#include <subdev/dvfs.h>
> +
> +struct nouveau_dvfs_dev_status {
> + unsigned long total;
> + unsigned long busy;
> + int cur_state;
> +};
> +
> +struct nouveau_dvfs_impl {
> + struct nouveau_oclass base;
> + int (*get_dev_status)(struct nouveau_dvfs *,
> + struct nouveau_dvfs_dev_status *);
> + void (*reset_dev_status)(struct nouveau_dvfs *);
> + int (*target)(struct nouveau_dvfs *, int *state);
> + int (*get_cur_state)(struct nouveau_dvfs *, int *state);
> + int (*get_target_state)(struct nouveau_dvfs *, int *state, int load);
> +};
> +
> +#define nouveau_dvfs_create(p,e,o,d) \
> + nouveau_dvfs_create_((p), (e), (o), sizeof(**d), (void **)d)
> +#define nouveau_dvfs_destroy(p) ({ \
> + struct nouveau_dvfs *d = (p); \
> + _nouveau_dvfs_dtor(nv_object(d)); \
> +})
> +#define nouveau_dvfs_init(p) ({ \
> + struct nouveau_dvfs *d = (p); \
> + _nouveau_dvfs_init(nv_object(d)); \
> +})
> +#define nouveau_dvfs_fini(p,s) ({ \
> + struct nouveau_dvfs *d = (p); \
> + _nouveau_dvfs_fini(nv_object(d), (s)); \
> +})
> +
> +int nouveau_dvfs_create_(struct nouveau_object *, struct nouveau_object *,
> + struct nouveau_oclass *, int, void **);
> +void _nouveau_dvfs_dtor(struct nouveau_object *);
> +int _nouveau_dvfs_init(struct nouveau_object *);
> +int _nouveau_dvfs_fini(struct nouveau_object *, bool suspend);
> +
> +#endif
> --
> 1.9.1
>
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