[PATCH] drm/i915: Remove unused underrun interrupt bits
Vivekanandan, Balasubramani
balasubramani.vivekanandan at intel.com
Thu Oct 10 17:13:44 UTC 2024
On 09.10.2024 15:35, Pottumuttu, Sai Teja wrote:
>
> On 09-10-2024 13:05, Vivekanandan, Balasubramani wrote:
> > On 26.09.2024 10:52, Pottumuttu, Sai Teja wrote:
> > > On 25-09-2024 19:33, Ville Syrjälä wrote:
> > > > On Wed, Sep 25, 2024 at 04:48:02PM +0530, Sai Teja Pottumuttu wrote:
> > > > > Underrun recovery was defeatured and was never brought into usage.
> > > > > Thus we can safely remove the interrupt register bits introduced by the
> > > > > feature for detecting soft and hard underruns.
> > > > >
> > > > > Signed-off-by: Sai Teja Pottumuttu <sai.teja.pottumuttu at intel.com>
> > > > > ---
> > > > > .../gpu/drm/i915/display/intel_display_irq.c | 19 +++----------------
> > > > > .../gpu/drm/i915/display/intel_display_irq.h | 1 -
> > > > > .../drm/i915/display/intel_fifo_underrun.c | 5 ++---
> > > > There's a lot more related stuff in that file.
> > > Assuming that you are referring to the ICL_PIPE_STATUS register and the bits
> > > added there to detect soft, hard, port underruns,
> > Is it only the underrun recovery defeatured? Do we have the reporting of
> > underruns caused downstream by the port/transcoder working?
> > Then it makes sense to me to still keep the Port/Transcoder underrun
> > reporting as it would help in debugging any underruns.
> > Still there would be stuff related to Hard/Soft underruns which can be
> > removed from the driver like those in function
> > icl_pipe_status_underrun_mask, printing of soft/hard underruns in
> > intel_cpu_fifo_underrun_irq_handler.
> >
> > Regards,
> > Bala
>
> The reporting is also de-featured. So, as part of the logging/reporting we
> had 4 things being reported and following are there statuses
>
> 1. PIPE_STATUS_SOFT_UNDERRUN_XELPD: This can safely be removed.
> 2. PIPE_STATUS_HARD_UNDERRUN_XELPD: This can be removed as well.
> 3. PIPE_STATUS_PORT_UNDERRUN_XELPD: This seems to be the problem, this is
> de-featured as well but currently is always set and thus the string "port"
> appears in the ci bugs. Removing this might cause duplications in ci bugs if
> it fails to understand that its the same bug even without "port".
> 4. PIPE_STATUS_UNDERRUN: This still tells that the underrun happened on the
> transcoder attached to this pipe. But then as far as I understand, the
> underrun interrupt itself tells that its an underrun on the transcoder so we
> need not use this bit specificially I believe. But then again removing this
> and the "transcoder" string there might cause ci issues.
>
> So, we have two options here
>
> 1. Either just remove the SOFT/HARD underrun bits/reporting for now and
> remove the other ones at a later point of time.
> 2. Or remove all these bits and make sure CI doesn't start filing duplicate
> bugs.
>
> What would be your suggestion here?
We can just remove the SOFT/HARD underrun reporting for now to avoid impacting CI.
Regards,
Bala
>
> >
> > > I have not removed those bits in this patch because we are logging these
> > > bits in dmesg and specifically the PIPE_STATUS_PORT_UNDERRUN_XELPD,
> > > PIPE_STATUS_UNDERRUN bits seems to be set always because of which "port,
> > > transcoder" string appears in a lot of underrun issues filed by CI. I was
> > > under an assumption that if we remove these bits and the log, it would
> > > create trouble with CI filters and we might start seeing duplicates of the
> > > existing issues as new issues. So, my plan was to remove those bits at some
> > > later point.
> > >
> > > What would be your suggestion? Should we remove them now itself and work
> > > with CI to see that filters still detect the existing issues without "port,
> > > transcoder" as well.
> > >
> > > > > drivers/gpu/drm/i915/i915_reg.h | 2 --
> > > > > 4 files changed, 5 insertions(+), 22 deletions(-)
> > > > >
> > > > > diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.c b/drivers/gpu/drm/i915/display/intel_display_irq.c
> > > > > index 6878dde85031..9d8a101b2415 100644
> > > > > --- a/drivers/gpu/drm/i915/display/intel_display_irq.c
> > > > > +++ b/drivers/gpu/drm/i915/display/intel_display_irq.c
> > > > > @@ -1031,17 +1031,6 @@ static u32 gen8_de_pipe_flip_done_mask(struct drm_i915_private *i915)
> > > > > return GEN8_PIPE_PRIMARY_FLIP_DONE;
> > > > > }
> > > > > -u32 gen8_de_pipe_underrun_mask(struct drm_i915_private *dev_priv)
> > > > > -{
> > > > > - u32 mask = GEN8_PIPE_FIFO_UNDERRUN;
> > > > > -
> > > > > - if (DISPLAY_VER(dev_priv) >= 13)
> > > > > - mask |= XELPD_PIPE_SOFT_UNDERRUN |
> > > > > - XELPD_PIPE_HARD_UNDERRUN;
> > > > > -
> > > > > - return mask;
> > > > > -}
> > > > > -
> > > > > static void gen8_read_and_ack_pch_irqs(struct drm_i915_private *i915, u32 *pch_iir, u32 *pica_iir)
> > > > > {
> > > > > u32 pica_ier = 0;
> > > > > @@ -1187,7 +1176,7 @@ void gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
> > > > > if (iir & GEN8_PIPE_CDCLK_CRC_DONE)
> > > > > hsw_pipe_crc_irq_handler(dev_priv, pipe);
> > > > > - if (iir & gen8_de_pipe_underrun_mask(dev_priv))
> > > > > + if (iir & GEN8_PIPE_FIFO_UNDERRUN)
> > > > > intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe);
> > > > > fault_errors = iir & gen8_de_pipe_fault_mask(dev_priv);
> > > > > @@ -1607,8 +1596,7 @@ void gen8_irq_power_well_post_enable(struct drm_i915_private *dev_priv,
> > > > > u8 pipe_mask)
> > > > > {
> > > > > struct intel_uncore *uncore = &dev_priv->uncore;
> > > > > - u32 extra_ier = GEN8_PIPE_VBLANK |
> > > > > - gen8_de_pipe_underrun_mask(dev_priv) |
> > > > > + u32 extra_ier = GEN8_PIPE_VBLANK | GEN8_PIPE_FIFO_UNDERRUN |
> > > > > gen8_de_pipe_flip_done_mask(dev_priv);
> > > > > enum pipe pipe;
> > > > > @@ -1797,8 +1785,7 @@ void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
> > > > > GEN12_DSB_INT(INTEL_DSB_2);
> > > > > de_pipe_enables = de_pipe_masked |
> > > > > - GEN8_PIPE_VBLANK |
> > > > > - gen8_de_pipe_underrun_mask(dev_priv) |
> > > > > + GEN8_PIPE_VBLANK | GEN8_PIPE_FIFO_UNDERRUN |
> > > > > gen8_de_pipe_flip_done_mask(dev_priv);
> > > > > de_port_enables = de_port_masked;
> > > > > diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.h b/drivers/gpu/drm/i915/display/intel_display_irq.h
> > > > > index 093e356a2894..1b3f559a0638 100644
> > > > > --- a/drivers/gpu/drm/i915/display/intel_display_irq.h
> > > > > +++ b/drivers/gpu/drm/i915/display/intel_display_irq.h
> > > > > @@ -33,7 +33,6 @@ void ibx_disable_display_interrupt(struct drm_i915_private *i915, u32 bits);
> > > > > void gen8_irq_power_well_post_enable(struct drm_i915_private *i915, u8 pipe_mask);
> > > > > void gen8_irq_power_well_pre_disable(struct drm_i915_private *i915, u8 pipe_mask);
> > > > > -u32 gen8_de_pipe_underrun_mask(struct drm_i915_private *i915);
> > > > > int i8xx_enable_vblank(struct drm_crtc *crtc);
> > > > > int i915gm_enable_vblank(struct drm_crtc *crtc);
> > > > > diff --git a/drivers/gpu/drm/i915/display/intel_fifo_underrun.c b/drivers/gpu/drm/i915/display/intel_fifo_underrun.c
> > > > > index 745ce22afb89..fb01c128e1c5 100644
> > > > > --- a/drivers/gpu/drm/i915/display/intel_fifo_underrun.c
> > > > > +++ b/drivers/gpu/drm/i915/display/intel_fifo_underrun.c
> > > > > @@ -209,7 +209,6 @@ static void bdw_set_fifo_underrun_reporting(struct drm_device *dev,
> > > > > enum pipe pipe, bool enable)
> > > > > {
> > > > > struct drm_i915_private *dev_priv = to_i915(dev);
> > > > > - u32 mask = gen8_de_pipe_underrun_mask(dev_priv);
> > > > > if (enable) {
> > > > > if (DISPLAY_VER(dev_priv) >= 11)
> > > > > @@ -217,9 +216,9 @@ static void bdw_set_fifo_underrun_reporting(struct drm_device *dev,
> > > > > ICL_PIPESTATUS(dev_priv, pipe),
> > > > > icl_pipe_status_underrun_mask(dev_priv));
> > > > > - bdw_enable_pipe_irq(dev_priv, pipe, mask);
> > > > > + bdw_enable_pipe_irq(dev_priv, pipe, GEN8_PIPE_FIFO_UNDERRUN);
> > > > > } else {
> > > > > - bdw_disable_pipe_irq(dev_priv, pipe, mask);
> > > > > + bdw_disable_pipe_irq(dev_priv, pipe, GEN8_PIPE_FIFO_UNDERRUN);
> > > > > }
> > > > > }
> > > > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > > > > index 7396fc630e29..c379d875f432 100644
> > > > > --- a/drivers/gpu/drm/i915/i915_reg.h
> > > > > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > > > > @@ -2491,9 +2491,7 @@
> > > > > #define GEN12_PIPEDMC_INTERRUPT REG_BIT(26) /* tgl+ */
> > > > > #define GEN12_PIPEDMC_FAULT REG_BIT(25) /* tgl+ */
> > > > > #define MTL_PIPEDMC_ATS_FAULT REG_BIT(24) /* mtl+ */
> > > > > -#define XELPD_PIPE_SOFT_UNDERRUN REG_BIT(22) /* adl/dg2+ */
> > > > > #define GEN11_PIPE_PLANE7_FAULT REG_BIT(22) /* icl/tgl */
> > > > > -#define XELPD_PIPE_HARD_UNDERRUN REG_BIT(21) /* adl/dg2+ */
> > > > > #define GEN11_PIPE_PLANE6_FAULT REG_BIT(21) /* icl/tgl */
> > > > > #define GEN11_PIPE_PLANE5_FAULT REG_BIT(20) /* icl+ */
> > > > > #define GEN12_PIPE_VBLANK_UNMOD REG_BIT(19) /* tgl+ */
> > > > > --
> > > > > 2.34.1
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