On Wed, Oct 21, 2015 at 01:22:43PM +0200, Daniel Vetter wrote:
> On Wed, Oct 14, 2015 at 07:29:02PM +0300, ville.syrjala@xxxxxxxxxxxxxxx wrote:
> > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> >
> > SKL+ needs >4K alignment for tiled surfaces, so make
> > intel_compute_page_offset() handle it.
> >
> > The way we do it is first we compute the closest tile boundary
> > as before, and then figure out how many tiles we need to go
> > to reach the desired alignment. The difference in the offset
> > is then added into the x/y offsets.
> >
> > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/intel_display.c | 51 ++++++++++++++++++++++++++++++++----
> > 1 file changed, 46 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index 5f3abce..85e1473 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -2479,6 +2479,39 @@ static void intel_rotate_tile_dims(unsigned int *tile_width,
> > }
> >
> > /*
> > + * Adjust the page offset by moving the difference into
> > + * the x/y offsets.
> > + *
> > + * Input tile dimensions and pitch must already be
> > + * rotated to match x and y, and in pixel units.
> > + * intel_rotate_tile_dims() gives exactly that.
> > + */
> > +static void intel_adjust_page_offset(int *x, int *y,
> > + unsigned int tile_width,
> > + unsigned int tile_height,
> > + unsigned int tile_size,
> > + unsigned int pitch,
> > + unsigned int old_offset,
> > + unsigned int new_offset)
> > +{
> > + unsigned int tiles;
> > +
> > + WARN_ON(old_offset & (tile_size - 1));
> > + WARN_ON(new_offset & (tile_size - 1));
> > + WARN_ON(new_offset > old_offset);
> > +
> > + tiles = (old_offset - new_offset) / tile_size;
> > + if (tiles == 0)
> > + return;
> > +
> > + /* pitch in tiles */
> > + pitch /= tile_width;
>
> Isn't tile_width here now in pixels and no longer in bytes? And we need
> bytes here I think, i.e. tile_pitch.
>
> > +
> > + *y += tiles / pitch * tile_height;
> > + *x += tiles % pitch * tile_width;
>
> But here we need tile_width in pixels. I'm confused.
Looking harder I realized that you also adjust the pitch in the rotation
patch. Imo that's pulling a few too many tricks, we really need to clear
up tile_width (imo pixels) vs. tile_pitch (imo bytes) vs. pitch (always in
pixels). But that can be done later on.
> > +}
> > +
> > +/*
> > * Computes the linear offset to the base tile and adjusts
> > * x, y. bytes per pixel is assumed to be a power-of-two.
> > *
> > @@ -2493,6 +2526,12 @@ unsigned long intel_compute_page_offset(struct drm_i915_private *dev_priv,
> > unsigned int pitch,
> > unsigned int rotation)
> > {
> > + unsigned int offset, alignment;
> > +
> > + alignment = intel_surf_alignment(dev_priv, fb_modifier);
> > + if (alignment)
> > + alignment--;
> > +
> > if (fb_modifier != DRM_FORMAT_MOD_NONE) {
> > unsigned int tile_size, tile_width, tile_height;
> > unsigned int tile_rows, tiles;
> > @@ -2510,16 +2549,18 @@ unsigned long intel_compute_page_offset(struct drm_i915_private *dev_priv,
> > tiles = *x / tile_width;
> > *x %= tile_width;
> >
> > - return (tile_rows * (pitch / tile_width) + tiles) * tile_size;
> > - } else {
> > - unsigned int alignment = intel_linear_alignment(dev_priv) - 1;
> > - unsigned int offset;
> > + offset = (tile_rows * (pitch / tile_width) + tiles) * tile_size;
> >
> > + intel_adjust_page_offset(x, y, tile_width, tile_height,
> > + tile_size, pitch,
> > + offset, offset & ~alignment);
>
> offset_aligned = ALIGN(offset, alignment); instead of open-coding it.
So with myself unconfused, if you apply the ALIGN:
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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