On Wed, Sep 18, 2019 at 10:07 PM Sean Paul <sean@xxxxxxxxxx> wrote:
>
> From: Sean Paul <seanpaul@xxxxxxxxxxxx>
>
> This patch adds a debugfs entry to surface the entry and exit times as
> well as the calculated delay.
>
> Suggested-by: Daniel Vetter <daniel@xxxxxxxx>
> Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
>
> Changes in v2:
> - Added to the set
> ---
>
> Wasn't too sure how to initialize this, as calling the helper function
> from drm_debugfs.c seemed... wrong. However there weren't any other
> compelling solutions, so I figured I'd post this and learn something
> new.
Won't build, because drm.ko can't depend upon stuff in
drm-kms-helper.ko, since that already depends upon the former.
I think we need a drm_self_refresh_helper_register which drivers can
call from their crtc->late_register callback. I think Noralf was
working on some infrastructure to make this neater, but it didn't land
yet.
-Daniel
>
>
>
> drivers/gpu/drm/drm_debugfs.c | 10 +++++
> drivers/gpu/drm/drm_self_refresh_helper.c | 55 ++++++++++++++++++++++-
> include/drm/drm_self_refresh_helper.h | 6 +++
> 3 files changed, 69 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
> index eab0f2687cd6..175c2451ae72 100644
> --- a/drivers/gpu/drm/drm_debugfs.c
> +++ b/drivers/gpu/drm/drm_debugfs.c
> @@ -38,6 +38,9 @@
> #include <drm/drm_edid.h>
> #include <drm/drm_file.h>
> #include <drm/drm_gem.h>
> +#if defined(CONFIG_DRM_KMS_HELPER)
> +#include <drm/drm_self_refresh_helper.h>
> +#endif
>
> #include "drm_crtc_internal.h"
> #include "drm_internal.h"
> @@ -231,6 +234,13 @@ int drm_debugfs_init(struct drm_minor *minor, int minor_id,
> DRM_ERROR("Failed to create atomic debugfs files\n");
> return ret;
> }
> +#if defined(CONFIG_DRM_KMS_HELPER)
> + ret = drm_self_refresh_debugfs_init(minor);
> + if (ret) {
> + DRM_ERROR("Failed to init self refresh debugfs\n");
> + return ret;
> + }
> +#endif
> }
>
> if (drm_core_check_feature(dev, DRIVER_MODESET)) {
> diff --git a/drivers/gpu/drm/drm_self_refresh_helper.c b/drivers/gpu/drm/drm_self_refresh_helper.c
> index 68f4765a5896..e7544ae1e47b 100644
> --- a/drivers/gpu/drm/drm_self_refresh_helper.c
> +++ b/drivers/gpu/drm/drm_self_refresh_helper.c
> @@ -14,7 +14,9 @@
> #include <drm/drm_atomic_helper.h>
> #include <drm/drm_connector.h>
> #include <drm/drm_crtc.h>
> +#include <drm/drm_debugfs.h>
> #include <drm/drm_device.h>
> +#include <drm/drm_file.h>
> #include <drm/drm_mode_config.h>
> #include <drm/drm_modeset_lock.h>
> #include <drm/drm_print.h>
> @@ -167,6 +169,16 @@ void drm_self_refresh_helper_update_avg_times(struct drm_atomic_state *state,
> }
> EXPORT_SYMBOL(drm_self_refresh_helper_update_avg_times);
>
> +static unsigned int
> +drm_self_refresh_calc_idle_delay(struct drm_self_refresh_data *sr_data)
> +{
> + if (WARN_ON(!mutex_is_locked(&sr_data->avg_mutex)))
> + return SELF_REFRESH_AVG_SEED_MS * 4;
> +
> + return (ewma_psr_time_read(&sr_data->entry_avg_ms) +
> + ewma_psr_time_read(&sr_data->exit_avg_ms)) * 2;
> +}
> +
> /**
> * drm_self_refresh_helper_alter_state - Alters the atomic state for SR exit
> * @state: the state currently being checked
> @@ -209,8 +221,7 @@ void drm_self_refresh_helper_alter_state(struct drm_atomic_state *state)
> continue;
>
> mutex_lock(&sr_data->avg_mutex);
> - delay = (ewma_psr_time_read(&sr_data->entry_avg_ms) +
> - ewma_psr_time_read(&sr_data->exit_avg_ms)) * 2;
> + delay = drm_self_refresh_calc_idle_delay(sr_data);
> mutex_unlock(&sr_data->avg_mutex);
>
> mod_delayed_work(system_wq, &sr_data->entry_work,
> @@ -275,3 +286,43 @@ void drm_self_refresh_helper_cleanup(struct drm_crtc *crtc)
> kfree(sr_data);
> }
> EXPORT_SYMBOL(drm_self_refresh_helper_cleanup);
> +
> +#ifdef CONFIG_DEBUG_FS
> +
> +static int drm_self_refresh_debugfs_state(struct seq_file *m, void *data)
> +{
> + struct drm_info_node *node = (struct drm_info_node *) m->private;
> + struct drm_device *dev = node->minor->dev;
> + struct drm_printer p = drm_seq_file_printer(m);
> + struct drm_crtc *crtc;
> +
> + drm_for_each_crtc(crtc, dev) {
> + struct drm_self_refresh_data *sr_data = crtc->self_refresh_data;
> + if (!sr_data)
> + continue;
> +
> + mutex_lock(&sr_data->avg_mutex);
> + drm_printf(&p, "crtc[%u]: %s\n", crtc->base.id, crtc->name);
> + drm_printf(&p, "\tentry_avg_ms=%lu\n",
> + ewma_psr_time_read(&sr_data->entry_avg_ms));
> + drm_printf(&p, "\texit_avg_ms=%lu\n",
> + ewma_psr_time_read(&sr_data->exit_avg_ms));
> + drm_printf(&p, "\tidle_delay=%u\n",
> + drm_self_refresh_calc_idle_delay(sr_data));
> + mutex_unlock(&sr_data->avg_mutex);
> + }
> + return 0;
> +}
> +
> +static const struct drm_info_list drm_atomic_debugfs_list[] = {
> + {"self_refresh_state", drm_self_refresh_debugfs_state, 0},
> +};
> +
> +int drm_self_refresh_debugfs_init(struct drm_minor *minor)
> +{
> + return drm_debugfs_create_files(drm_atomic_debugfs_list,
> + ARRAY_SIZE(drm_atomic_debugfs_list),
> + minor->debugfs_root, minor);
> +}
> +EXPORT_SYMBOL(drm_self_refresh_debugfs_init);
> +#endif
> diff --git a/include/drm/drm_self_refresh_helper.h b/include/drm/drm_self_refresh_helper.h
> index 5b79d253fb46..779f81e035f1 100644
> --- a/include/drm/drm_self_refresh_helper.h
> +++ b/include/drm/drm_self_refresh_helper.h
> @@ -17,4 +17,10 @@ void drm_self_refresh_helper_update_avg_times(struct drm_atomic_state *state,
>
> int drm_self_refresh_helper_init(struct drm_crtc *crtc);
> void drm_self_refresh_helper_cleanup(struct drm_crtc *crtc);
> +
> +#ifdef CONFIG_DEBUG_FS
> +struct drm_minor;
> +int drm_self_refresh_debugfs_init(struct drm_minor *minor);
> +#endif
> +
> #endif
> --
> Sean Paul, Software Engineer, Google / Chromium OS
>
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel
