[PATCH v6 1/7] drm/i915: Add enable/disable flip done and flip done handler
Karthik B S
karthik.b.s at intel.com
Wed Sep 2 14:12:09 UTC 2020
On 9/1/2020 5:10 PM, Ville Syrjälä wrote:
> On Fri, Aug 07, 2020 at 03:05:45PM +0530, Karthik B S wrote:
>> Add enable/disable flip done functions and the flip done handler
>> function which handles the flip done interrupt.
>>
>> Enable the flip done interrupt in IER.
>>
>> Enable flip done function is called before writing the
>> surface address register as the write to this register triggers
>> the flip done interrupt
>>
>> Flip done handler is used to send the page flip event as soon as the
>> surface address is written as per the requirement of async flips.
>> The interrupt is disabled after the event is sent.
>>
>> v2: -Change function name from icl_* to skl_* (Paulo)
>> -Move flip handler to this patch (Paulo)
>> -Remove vblank_put() (Paulo)
>> -Enable flip done interrupt for gen9+ only (Paulo)
>> -Enable flip done interrupt in power_well_post_enable hook (Paulo)
>> -Removed the event check in flip done handler to handle async
>> flips without pageflip events.
>>
>> v3: -Move skl_disable_flip_done out of interrupt handler (Paulo)
>> -Make the pending vblank event NULL in the beginning of
>> flip_done_handler to remove sporadic WARN_ON that is seen.
>>
>> v4: -Calculate timestamps using flip done time stamp and current
>> timestamp for async flips (Ville)
>>
>> v5: -Fix the sparse warning by making the function 'g4x_get_flip_counter'
>> static.(Reported-by: kernel test robot <lkp at intel.com>)
>> -Fix the typo in commit message.
>>
>> v6: -Revert back to old time stamping code.
>> -Remove the break while calling skl_enable_flip_done. (Paulo)
>>
>> Signed-off-by: Karthik B S <karthik.b.s at intel.com>
>> Signed-off-by: Vandita Kulkarni <vandita.kulkarni at intel.com>
>> ---
>> drivers/gpu/drm/i915/display/intel_display.c | 8 +++
>> drivers/gpu/drm/i915/i915_irq.c | 52 ++++++++++++++++++++
>> drivers/gpu/drm/i915/i915_irq.h | 2 +
>> 3 files changed, 62 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
>> index 522c772a2111..1ac2e6f27597 100644
>> --- a/drivers/gpu/drm/i915/display/intel_display.c
>> +++ b/drivers/gpu/drm/i915/display/intel_display.c
>> @@ -15562,6 +15562,11 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>>
>> intel_dbuf_pre_plane_update(state);
>>
>> + for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
>> + if (new_crtc_state->uapi.async_flip)
>> + skl_enable_flip_done(&crtc->base);
>> + }
>> +
>> /* Now enable the clocks, plane, pipe, and connectors that we set up. */
>> dev_priv->display.commit_modeset_enables(state);
>>
>> @@ -15583,6 +15588,9 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>> drm_atomic_helper_wait_for_flip_done(dev, &state->base);
>>
>> for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
>> + if (new_crtc_state->uapi.async_flip)
>> + skl_disable_flip_done(&crtc->base);
>> +
>> if (new_crtc_state->hw.active &&
>> !needs_modeset(new_crtc_state) &&
>> !new_crtc_state->preload_luts &&
>> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
>> index f113fe44572b..6cc129b031d3 100644
>> --- a/drivers/gpu/drm/i915/i915_irq.c
>> +++ b/drivers/gpu/drm/i915/i915_irq.c
>> @@ -1296,6 +1296,23 @@ display_pipe_crc_irq_handler(struct drm_i915_private *dev_priv,
>> u32 crc4) {}
>> #endif
>>
>> +static void flip_done_handler(struct drm_i915_private *dev_priv,
>> + unsigned int pipe)
>> +{
>> + struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
>> + struct drm_crtc_state *crtc_state = crtc->base.state;
>> + struct drm_pending_vblank_event *e = crtc_state->event;
>> + struct drm_device *dev = &dev_priv->drm;
>> + unsigned long irqflags;
>> +
>> + spin_lock_irqsave(&dev->event_lock, irqflags);
>> +
>> + crtc_state->event = NULL;
>> +
>> + drm_crtc_send_vblank_event(&crtc->base, e);
>
> The timestamp is going to be wrong here. We should perhaps just sample
> the current time+frame counter here.
>
Thanks for the review.
Tried updating the proper timestamp in the previous version(V5) of the
series by using flip timestamp. Feeback received was that userspace
doesn't use this.Also trying to align to the current AMD implementation,
where the timestamp corresponds to the previous vblank timestamp.
In V5, we had tried by updating the sequence(by using flip counter), but
the feedback received was that the sequence shouldn't change and it
should always reflect the frame counter.Thus, in our current
implementation we do not make any changes to the sequence.So, even if
there is any update in time stamp it doesn't get reflected, even after
calling drm_update_vblank_count.
As userspace is not interested in this (as per the previous mail
discussions, I've updated the kernel documentation also with this
detail), should we implement this?
Thanks,
Karthik.B.S
>> +
>> + spin_unlock_irqrestore(&dev->event_lock, irqflags);
>> +}
>>
>> static void hsw_pipe_crc_irq_handler(struct drm_i915_private *dev_priv,
>> enum pipe pipe)
>> @@ -2390,6 +2407,9 @@ gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
>> if (iir & GEN8_PIPE_VBLANK)
>> intel_handle_vblank(dev_priv, pipe);
>>
>> + if (iir & GEN9_PIPE_PLANE1_FLIP_DONE)
>> + flip_done_handler(dev_priv, pipe);
>> +
>> if (iir & GEN8_PIPE_CDCLK_CRC_DONE)
>> hsw_pipe_crc_irq_handler(dev_priv, pipe);
>>
>> @@ -2711,6 +2731,19 @@ int bdw_enable_vblank(struct drm_crtc *crtc)
>> return 0;
>> }
>>
>> +void skl_enable_flip_done(struct drm_crtc *crtc)
>> +{
>> + struct drm_i915_private *dev_priv = to_i915(crtc->dev);
>> + enum pipe pipe = to_intel_crtc(crtc)->pipe;
>> + unsigned long irqflags;
>> +
>> + spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
>> +
>> + bdw_enable_pipe_irq(dev_priv, pipe, GEN9_PIPE_PLANE1_FLIP_DONE);
>> +
>> + spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
>> +}
>> +
>> /* Called from drm generic code, passed 'crtc' which
>> * we use as a pipe index
>> */
>> @@ -2771,6 +2804,19 @@ void bdw_disable_vblank(struct drm_crtc *crtc)
>> spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
>> }
>>
>> +void skl_disable_flip_done(struct drm_crtc *crtc)
>> +{
>> + struct drm_i915_private *dev_priv = to_i915(crtc->dev);
>> + enum pipe pipe = to_intel_crtc(crtc)->pipe;
>> + unsigned long irqflags;
>> +
>> + spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
>> +
>> + bdw_disable_pipe_irq(dev_priv, pipe, GEN9_PIPE_PLANE1_FLIP_DONE);
>> +
>> + spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
>> +}
>> +
>> static void ibx_irq_reset(struct drm_i915_private *dev_priv)
>> {
>> struct intel_uncore *uncore = &dev_priv->uncore;
>> @@ -2981,6 +3027,9 @@ void gen8_irq_power_well_post_enable(struct drm_i915_private *dev_priv,
>> u32 extra_ier = GEN8_PIPE_VBLANK | GEN8_PIPE_FIFO_UNDERRUN;
>> enum pipe pipe;
>>
>> + if (INTEL_GEN(dev_priv) >= 9)
>> + extra_ier |= GEN9_PIPE_PLANE1_FLIP_DONE;
>> +
>> spin_lock_irq(&dev_priv->irq_lock);
>>
>> if (!intel_irqs_enabled(dev_priv)) {
>> @@ -3459,6 +3508,9 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
>> de_pipe_enables = de_pipe_masked | GEN8_PIPE_VBLANK |
>> GEN8_PIPE_FIFO_UNDERRUN;
>>
>> + if (INTEL_GEN(dev_priv) >= 9)
>> + de_pipe_enables |= GEN9_PIPE_PLANE1_FLIP_DONE;
>> +
>> de_port_enables = de_port_masked;
>> if (IS_GEN9_LP(dev_priv))
>> de_port_enables |= BXT_DE_PORT_HOTPLUG_MASK;
>> diff --git a/drivers/gpu/drm/i915/i915_irq.h b/drivers/gpu/drm/i915/i915_irq.h
>> index 25f25cd95818..2f10c8135116 100644
>> --- a/drivers/gpu/drm/i915/i915_irq.h
>> +++ b/drivers/gpu/drm/i915/i915_irq.h
>> @@ -112,11 +112,13 @@ int i915gm_enable_vblank(struct drm_crtc *crtc);
>> int i965_enable_vblank(struct drm_crtc *crtc);
>> int ilk_enable_vblank(struct drm_crtc *crtc);
>> int bdw_enable_vblank(struct drm_crtc *crtc);
>> +void skl_enable_flip_done(struct drm_crtc *crtc);
>> void i8xx_disable_vblank(struct drm_crtc *crtc);
>> void i915gm_disable_vblank(struct drm_crtc *crtc);
>> void i965_disable_vblank(struct drm_crtc *crtc);
>> void ilk_disable_vblank(struct drm_crtc *crtc);
>> void bdw_disable_vblank(struct drm_crtc *crtc);
>> +void skl_disable_flip_done(struct drm_crtc *crtc);
>>
>> void gen2_irq_reset(struct intel_uncore *uncore);
>> void gen3_irq_reset(struct intel_uncore *uncore, i915_reg_t imr,
>> --
>> 2.22.0
>
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