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gpu: nvgpu: Add sw shadow for load value

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Reading the load value may increase CPU power consumption
temprorarily. In most cases we are ok with a value that
was read a moment earlier.

This patch introduces a software shadow for gpu load. The shadow
is updated before starting scaling and all scaling code paths use
the sw shadow.

Change-Id: I53d2ccb8e7f83147f411a14d3104d890dd9af9a3
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Reviewed-on: http://git-master/r/453347
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
This commit is contained in:
Arto Merilainen
2014-08-06 09:30:11 +03:00
committed by Dan Willemsen
parent 273f754cb5
commit b33020008b
4 changed files with 14 additions and 2 deletions
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3
drivers/gpu/nvgpu/gk20a/gk20a_scale.c
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@@ -192,6 +192,9 @@ static void gk20a_scale_notify(struct platform_device *pdev, bool busy)
struct gk20a_scale_profile *profile = g->scale_profile;
struct devfreq *devfreq = g->devfreq;
/* update the software shadow */
gk20a_pmu_load_update(g);
/* inform edp about new constraint */
if (platform->prescale)
platform->prescale(pdev);

1
drivers/gpu/nvgpu/gk20a/gk20a_sysfs.c
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@@ -278,6 +278,7 @@ static ssize_t gk20a_load_show(struct device *dev,
busy_time = 0;
} else {
gk20a_busy(g->dev);
gk20a_pmu_load_update(g);
gk20a_pmu_load_norm(g, &busy_time);
gk20a_idle(g->dev);
}

10
drivers/gpu/nvgpu/gk20a/pmu_gk20a.c
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@@ -3676,17 +3676,23 @@ int gk20a_pmu_destroy(struct gk20a *g)
}
int gk20a_pmu_load_norm(struct gk20a *g, u32 *load)
{
*load = g->pmu.load_shadow;
return 0;
}
int gk20a_pmu_load_update(struct gk20a *g)
{
struct pmu_gk20a *pmu = &g->pmu;
u16 _load = 0;
if (!pmu->perfmon_ready) {
*load = 0;
pmu->load_shadow = 0;
return 0;
}
pmu_copy_from_dmem(pmu, pmu->sample_buffer, (u8 *)&_load, 2, 0);
*load = _load / 10;
pmu->load_shadow = _load / 10;
return 0;
}

2
drivers/gpu/nvgpu/gk20a/pmu_gk20a.h
View File

@@ -1079,6 +1079,7 @@ struct pmu_gk20a {
bool perfmon_ready;
u32 sample_buffer;
u32 load_shadow;
struct mutex isr_mutex;
struct mutex isr_enable_lock;
@@ -1119,6 +1120,7 @@ int pmu_mutex_acquire(struct pmu_gk20a *pmu, u32 id, u32 *token);
int pmu_mutex_release(struct pmu_gk20a *pmu, u32 id, u32 *token);
int gk20a_pmu_destroy(struct gk20a *g);
int gk20a_pmu_load_norm(struct gk20a *g, u32 *load);
int gk20a_pmu_load_update(struct gk20a *g);
int gk20a_pmu_debugfs_init(struct platform_device *dev);
void gk20a_pmu_reset_load_counters(struct gk20a *g);
void gk20a_pmu_get_load_counters(struct gk20a *g, u32 *busy_cycles,