On Tue, Feb 16, 2016 at 10:06:14AM +0100, Maarten Lankhorst wrote:
> Op 09-02-16 om 15:58 schreef Ville Syrjälä:
> > On Tue, Feb 09, 2016 at 03:05:51PM +0100, Maarten Lankhorst wrote:
> >> Op 09-02-16 om 14:37 schreef Ville Syrjälä:
> >>> On Tue, Feb 09, 2016 at 01:52:22PM +0100, Maarten Lankhorst wrote:
> >>>> Instead of duplicating the functionality now that we no longer need
> >>>> to preserve dpll state we can move to using the upstream suspend helper.
> >>>>
> >>>> Signed-off-by: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
> >>>> ---
> >>>> drivers/gpu/drm/drm_atomic_helper.c | 3 +
> >>>> drivers/gpu/drm/i915/i915_drv.c | 8 ---
> >>>> drivers/gpu/drm/i915/i915_drv.h | 1 +
> >>>> drivers/gpu/drm/i915/intel_display.c | 117
> >>>> ++++++++++++-----------------------
> >>>> 4 files changed, 42 insertions(+), 87 deletions(-)
> >>>>
> >>>> diff --git a/drivers/gpu/drm/drm_atomic_helper.c
> >>>> b/drivers/gpu/drm/drm_atomic_helper.c
> >>>> index 2b430b05f35d..a2d3b094f27c 100644
> >>>> --- a/drivers/gpu/drm/drm_atomic_helper.c
> >>>> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> >>>> @@ -2102,6 +2102,9 @@ int drm_atomic_helper_resume(struct drm_device
> >>>> *dev,
> >>>> err = drm_atomic_commit(state);
> >>>> drm_modeset_unlock_all(dev);
> >>>>
> >>>> + if (err)
> >>>> + drm_atomic_state_free(state);
> >>>> +
> >>>> return err;
> >>>> }
> >>>> EXPORT_SYMBOL(drm_atomic_helper_resume);
> >>>> diff --git a/drivers/gpu/drm/i915/i915_drv.c
> >>>> b/drivers/gpu/drm/i915/i915_drv.c
> >>>> index 11d8414edbbe..fc9b552bfcd1 100644
> >>>> --- a/drivers/gpu/drm/i915/i915_drv.c
> >>>> +++ b/drivers/gpu/drm/i915/i915_drv.c
> >>>> @@ -600,13 +600,7 @@ static int i915_drm_suspend(struct drm_device *dev)
> >>>>
> >>>> intel_suspend_gt_powersave(dev);
> >>>>
> >>>> - /*
> >>>> - * Disable CRTCs directly since we want to preserve sw state
> >>>> - * for _thaw. Also, power gate the CRTC power wells.
> >>>> - */
> >>>> - drm_modeset_lock_all(dev);
> >>>> intel_display_suspend(dev);
> >>>> - drm_modeset_unlock_all(dev);
> >>>>
> >>>> intel_dp_mst_suspend(dev);
> >>>>
> >>>> @@ -761,9 +755,7 @@ static int i915_drm_resume(struct drm_device *dev)
> >>>> dev_priv->display.hpd_irq_setup(dev);
> >>>> spin_unlock_irq(&dev_priv->irq_lock);
> >>>>
> >>>> - drm_modeset_lock_all(dev);
> >>>> intel_display_resume(dev);
> >>>> - drm_modeset_unlock_all(dev);
> >>>>
> >>>> intel_dp_mst_resume(dev);
> >>>>
> >>>> diff --git a/drivers/gpu/drm/i915/i915_drv.h
> >>>> b/drivers/gpu/drm/i915/i915_drv.h
> >>>> index 8216665405eb..ef289514b97e 100644
> >>>> --- a/drivers/gpu/drm/i915/i915_drv.h
> >>>> +++ b/drivers/gpu/drm/i915/i915_drv.h
> >>>> @@ -1848,6 +1848,7 @@ struct drm_i915_private {
> >>>>
> >>>> enum modeset_restore modeset_restore;
> >>>> struct mutex modeset_restore_lock;
> >>>> + struct drm_atomic_state *modeset_restore_state;
> >>>>
> >>>> struct list_head vm_list; /* Global list of all address spaces
> >>>> */
> >>>> struct i915_gtt gtt; /* VM representing the global address
> >>>> space */
> >>>> diff --git a/drivers/gpu/drm/i915/intel_display.c
> >>>> b/drivers/gpu/drm/i915/intel_display.c
> >>>> index e496c130364d..4c91fd1c5222 100644
> >>>> --- a/drivers/gpu/drm/i915/intel_display.c
> >>>> +++ b/drivers/gpu/drm/i915/intel_display.c
> >>>> @@ -6393,58 +6393,19 @@ static void intel_crtc_disable_noatomic(struct
> >>>> drm_crtc *crtc)
> >>>> */
> >>>> int intel_display_suspend(struct drm_device *dev)
> >>>> {
> >>>> - struct drm_mode_config *config = &dev->mode_config;
> >>>> - struct drm_modeset_acquire_ctx *ctx = config->acquire_ctx;
> >>>> - struct drm_atomic_state *state;
> >>>> - struct drm_crtc *crtc;
> >>>> - unsigned crtc_mask = 0;
> >>>> - int ret = 0;
> >>>> -
> >>>> - if (WARN_ON(!ctx))
> >>>> - return 0;
> >>>> -
> >>>> - lockdep_assert_held(&ctx->ww_ctx);
> >>>> - state = drm_atomic_state_alloc(dev);
> >>>> - if (WARN_ON(!state))
> >>>> - return -ENOMEM;
> >>>> -
> >>>> - state->acquire_ctx = ctx;
> >>>> - state->allow_modeset = true;
> >>>> -
> >>>> - for_each_crtc(dev, crtc) {
> >>>> - struct drm_crtc_state *crtc_state =
> >>>> - drm_atomic_get_crtc_state(state, crtc);
> >>>> -
> >>>> - ret = PTR_ERR_OR_ZERO(crtc_state);
> >>>> - if (ret)
> >>>> - goto free;
> >>>> -
> >>>> - if (!crtc_state->active)
> >>>> - continue;
> >>>> -
> >>>> - crtc_state->active = false;
> >>>> - crtc_mask |= 1 << drm_crtc_index(crtc);
> >>>> - }
> >>>> -
> >>>> - if (crtc_mask) {
> >>>> - ret = drm_atomic_commit(state);
> >>>> -
> >>>> - if (!ret) {
> >>>> - for_each_crtc(dev, crtc)
> >>>> - if (crtc_mask & (1 <<
> >>>> drm_crtc_index(crtc)))
> >>>> - crtc->state->active = true;
> >>>> -
> >>>> - return ret;
> >>>> - }
> >>>> - }
> >>>> + struct drm_i915_private *dev_priv = to_i915(dev);
> >>>> + int ret;
> >>>>
> >>>> -free:
> >>>> - if (ret)
> >>>> + dev_priv->modeset_restore_state =
> >>>> drm_atomic_helper_suspend(dev);
> >>>> + ret = PTR_ERR_OR_ZERO(dev_priv->modeset_restore_state);
> >>>> + if (ret) {
> >>>> DRM_ERROR("Suspending crtc's failed with %i\n", ret);
> >>>> - drm_atomic_state_free(state);
> >>>> + dev_priv->modeset_restore_state = NULL;
> >>>> + }
> >>> I would use a local state pointer and only assign it to
> >>> modeset_restore_state once we know it's good.
> >>>
> >>>> return ret;
> >>>> }
> >>>>
> >>>> +
> >>> Spurious newline.
> >>>
> >>>> void intel_encoder_destroy(struct drm_encoder *encoder)
> >>>> {
> >>>> struct intel_encoder *intel_encoder = to_intel_encoder(encoder);
> >>>> @@ -15909,51 +15870,49 @@ intel_modeset_setup_hw_state(struct drm_device
> >>>> *dev)
> >>>>
> >>>> void intel_display_resume(struct drm_device *dev)
> >>>> {
> >>>> - struct drm_atomic_state *state = drm_atomic_state_alloc(dev);
> >>>> - struct intel_connector *conn;
> >>>> - struct intel_plane *plane;
> >>>> + struct drm_i915_private *dev_priv = to_i915(dev);
> >>>> + struct drm_atomic_state *state =
> >>>> dev_priv->modeset_restore_state;
> >>>> + struct drm_modeset_acquire_ctx ctx;
> >>>> struct drm_crtc *crtc;
> >>>> - int ret;
> >>>> + struct drm_crtc_state *crtc_state;
> >>>> + int ret, i;
> >>>> +
> >>>> + intel_modeset_setup_hw_state(dev);
> >>> Isn't something in there going to scream about locking?
> >> I was hoping to find out by running it through CI..
> >>
> >> I don't see what possibly could scream however, from a glance it seems
> >> nothing depends on it.
> >>>> + i915_redisable_vga(dev);
> >>>> + dev_priv->modeset_restore_state = NULL;
> >>>>
> >>>> if (!state)
> >>>> return;
> >>>>
> >>>> - state->acquire_ctx = dev->mode_config.acquire_ctx;
> >>>> -
> >>>> - for_each_crtc(dev, crtc) {
> >>>> - struct drm_crtc_state *crtc_state =
> >>>> - drm_atomic_get_crtc_state(state, crtc);
> >>>> -
> >>>> - ret = PTR_ERR_OR_ZERO(crtc_state);
> >>>> - if (ret)
> >>>> - goto err;
> >>>> + drm_modeset_acquire_init(&ctx, 0);
> >>>> + state->acquire_ctx = &ctx;
> >>>>
> >>>> - /* force a restore */
> >>>> + for_each_crtc_in_state(state, crtc, crtc_state, i) {
> >>>> + /*
> >>>> + * Force recalculation even if we restore
> >>>> + * current state. With fast modeset this may not result
> >>>> + * in a modeset when the state is compatible.
> >>>> + */
> >>>> crtc_state->mode_changed = true;
> >>>> }
> >>> Hmm. Why do we need to set that exactly? If the current state doesn't
> >>> match the "to be restored" state, shouldn't something somewhere figure
> >>> out that we really need a modeset?
> >> We have a whole bunch of hw state from suspend that may be different from
> >> the hw readout in resume. This is not handled by the core because it
> >> doesn't know about driver specific pll's etc. So that's what the
> >> mode_changed = true is for. It's a hint to intel_atomic_check that might
> >> get downgraded to update_pipe if i915.fastboot is true and the hw readout
> >> and resume states are compatible.
> > Hmm. So it's a bit of a workaround due to the fact that
> > intel_atomic_check() doesn't actually check/update everything, and
> > instead tries to skip a bunch of stuff if the core didn't detect any
> > meaningful changes? I guess that makes some sense as an optimization.
> > That is, there's no need to check stuff if nothing user visible
> > changed anyway because we should anyway end up with the same state
> > that we had should we do a full recompute.
> >
> How about this? with --scissors
>
> --->8----
>
> Instead of duplicating the functionality now that we no longer need
> to preserve dpll state we can move to using the upstream suspend helper.
>
> Changes since v1:
> - Call hw readout with all mutexes held.
> - Rework intel_display_suspend to only assign modeset_restore_state
> on success.
>
> Signed-off-by: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
> ---
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 44912ecebc1a..20e82008b8b6 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -603,13 +603,7 @@ static int i915_drm_suspend(struct drm_device *dev)
>
> intel_suspend_gt_powersave(dev);
>
> - /*
> - * Disable CRTCs directly since we want to preserve sw state
> - * for _thaw. Also, power gate the CRTC power wells.
> - */
> - drm_modeset_lock_all(dev);
> intel_display_suspend(dev);
> - drm_modeset_unlock_all(dev);
>
> intel_dp_mst_suspend(dev);
>
> @@ -764,9 +758,7 @@ static int i915_drm_resume(struct drm_device *dev)
> dev_priv->display.hpd_irq_setup(dev);
> spin_unlock_irq(&dev_priv->irq_lock);
>
> - drm_modeset_lock_all(dev);
> intel_display_resume(dev);
> - drm_modeset_unlock_all(dev);
>
> intel_dp_mst_resume(dev);
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 20d9dbd9f9cf..6644c2e354c1 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1848,6 +1848,7 @@ struct drm_i915_private {
>
> enum modeset_restore modeset_restore;
> struct mutex modeset_restore_lock;
> + struct drm_atomic_state *modeset_restore_state;
>
> struct list_head vm_list; /* Global list of all address spaces */
> struct i915_gtt gtt; /* VM representing the global address space */
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index a18bd1296ce8..eaff32f59953 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -6393,55 +6393,16 @@ static void intel_crtc_disable_noatomic(struct
> drm_crtc *crtc)
> */
> int intel_display_suspend(struct drm_device *dev)
> {
> - struct drm_mode_config *config = &dev->mode_config;
> - struct drm_modeset_acquire_ctx *ctx = config->acquire_ctx;
> + struct drm_i915_private *dev_priv = to_i915(dev);
> struct drm_atomic_state *state;
> - struct drm_crtc *crtc;
> - unsigned crtc_mask = 0;
> - int ret = 0;
> -
> - if (WARN_ON(!ctx))
> - return 0;
> -
> - lockdep_assert_held(&ctx->ww_ctx);
> - state = drm_atomic_state_alloc(dev);
> - if (WARN_ON(!state))
> - return -ENOMEM;
> -
> - state->acquire_ctx = ctx;
> - state->allow_modeset = true;
> -
> - for_each_crtc(dev, crtc) {
> - struct drm_crtc_state *crtc_state =
> - drm_atomic_get_crtc_state(state, crtc);
> -
> - ret = PTR_ERR_OR_ZERO(crtc_state);
> - if (ret)
> - goto free;
> -
> - if (!crtc_state->active)
> - continue;
> -
> - crtc_state->active = false;
> - crtc_mask |= 1 << drm_crtc_index(crtc);
> - }
> -
> - if (crtc_mask) {
> - ret = drm_atomic_commit(state);
> -
> - if (!ret) {
> - for_each_crtc(dev, crtc)
> - if (crtc_mask & (1 << drm_crtc_index(crtc)))
> - crtc->state->active = true;
> -
> - return ret;
> - }
> - }
> + int ret;
>
> -free:
> + state = drm_atomic_helper_suspend(dev);
> + ret = PTR_ERR_OR_ZERO(state);
> if (ret)
> DRM_ERROR("Suspending crtc's failed with %i\n", ret);
> - drm_atomic_state_free(state);
> + else
> + dev_priv->modeset_restore_state = state;
> return ret;
> }
>
> @@ -15914,51 +15875,57 @@ intel_modeset_setup_hw_state(struct drm_device *dev)
>
> void intel_display_resume(struct drm_device *dev)
> {
> - struct drm_atomic_state *state = drm_atomic_state_alloc(dev);
> - struct intel_connector *conn;
> - struct intel_plane *plane;
> - struct drm_crtc *crtc;
> + struct drm_i915_private *dev_priv = to_i915(dev);
> + struct drm_atomic_state *state = dev_priv->modeset_restore_state;
> + struct drm_modeset_acquire_ctx ctx;
> int ret;
> + bool setup = false;
>
> - if (!state)
> - return;
> + dev_priv->modeset_restore_state = NULL;
>
> - state->acquire_ctx = dev->mode_config.acquire_ctx;
> + drm_modeset_acquire_init(&ctx, 0);
>
> - for_each_crtc(dev, crtc) {
> - struct drm_crtc_state *crtc_state =
> - drm_atomic_get_crtc_state(state, crtc);
> +retry:
> + ret = drm_modeset_lock_all_ctx(dev, &ctx);
>
> - ret = PTR_ERR_OR_ZERO(crtc_state);
> - if (ret)
> - goto err;
> + if (ret == 0 && !setup) {
I didn't consider this aspect when I suggested the idea of doing the
readout with the locks held. A bit ugly, but I suppose there's no really
neat way to go about it.
Well, in practice we shouldn't get EDEADLK from anywhere after
drm_modeset_lock_all_ctx() so we could avoid the !setup part perhaps,
but then it's going to look like no other atomic commit path which might
be worse.
> + setup = true;
>
> - /* force a restore */
> - crtc_state->mode_changed = true;
> + intel_modeset_setup_hw_state(dev);
> + i915_redisable_vga(dev);
> }
>
> - for_each_intel_plane(dev, plane) {
> - ret = PTR_ERR_OR_ZERO(drm_atomic_get_plane_state(state,
> &plane->base));
> - if (ret)
> - goto err;
> - }
> + if (ret == 0 && state) {
Another a bit ugly thing. But yeah we do want to check the NULL state
anyway, so seems like this is the easiest way.
So yeah, I think it looks all right (apart from diff having generated
a nasty hairball instead of something you can read easily), so
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> + struct drm_crtc_state *crtc_state;
> + struct drm_crtc *crtc;
> + int i;
>
> - for_each_intel_connector(dev, conn) {
> - ret = PTR_ERR_OR_ZERO(drm_atomic_get_connector_state(state,
> &conn->base));
> - if (ret)
> - goto err;
> + state->acquire_ctx = &ctx;
> +
> + for_each_crtc_in_state(state, crtc, crtc_state, i) {
> + /*
> + * Force recalculation even if we restore
> + * current state. With fast modeset this may not result
> + * in a modeset when the state is compatible.
> + */
> + crtc_state->mode_changed = true;
> + }
> +
> + ret = drm_atomic_commit(state);
> }
>
> - intel_modeset_setup_hw_state(dev);
> + if (ret == -EDEADLK) {
> + drm_modeset_backoff(&ctx);
> + goto retry;
> + }
>
> - i915_redisable_vga(dev);
> - ret = drm_atomic_commit(state);
> - if (!ret)
> - return;
> + drm_modeset_drop_locks(&ctx);
> + drm_modeset_acquire_fini(&ctx);
>
> -err:
> - DRM_ERROR("Restoring old state failed with %i\n", ret);
> - drm_atomic_state_free(state);
> + if (ret) {
> + DRM_ERROR("Restoring old state failed with %i\n", ret);
> + drm_atomic_state_free(state);
> + }
> }
>
> void intel_modeset_gem_init(struct drm_device *dev)
--
Ville Syrjälä
Intel OTC
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