Re: [PATCH xf86-video-intel v2 2/2] sna: Support 10bpc gamma via the GAMMA_LUT crtc property

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Thu, May 16, 2019 at 09:54:55PM +0200, Mario Kleiner wrote:
> On Fri, Apr 26, 2019 at 6:32 PM Ville Syrjala
> <ville.syrjala@linux.intel.com> wrote:
> >
> > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> >
> > Probe the GAMMA_LUT/GAMMA_LUT_SIZE props and utilize them when
> > the running with > 8bpc.
> >
> > v2: s/sna_crtc_id/__sna_crtc_id/ in DBG since we have a sna_crtc
> >
> > Cc: Mario Kleiner <mario.kleiner.de@gmail.com>
> > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > ---
> >  src/sna/sna_display.c | 245 +++++++++++++++++++++++++++++++++++-------
> >  1 file changed, 207 insertions(+), 38 deletions(-)
> >
> > diff --git a/src/sna/sna_display.c b/src/sna/sna_display.c
> > index 41edfec12839..6d671dce8c14 100644
> > --- a/src/sna/sna_display.c
> > +++ b/src/sna/sna_display.c
> > @@ -127,6 +127,7 @@ struct local_mode_obj_get_properties {
> >         uint32_t obj_type;
> >         uint32_t pad;
> >  };
> > +#define LOCAL_MODE_OBJECT_CRTC 0xcccccccc
> >  #define LOCAL_MODE_OBJECT_PLANE 0xeeeeeeee
> >
> >  struct local_mode_set_plane {
> > @@ -229,6 +230,11 @@ struct sna_crtc {
> >         } primary;
> >         struct list sprites;
> >
> > +       struct drm_color_lut *gamma_lut;
> > +       uint64_t gamma_lut_prop;
> > +       uint64_t gamma_lut_blob;
> > +       uint32_t gamma_lut_size;
> > +
> >         uint32_t mode_serial, flip_serial;
> >
> >         uint32_t last_seq, wrap_seq;
> > @@ -317,6 +323,9 @@ static void __sna_output_dpms(xf86OutputPtr output, int dpms, int fixup);
> >  static void sna_crtc_disable_cursor(struct sna *sna, struct sna_crtc *crtc);
> >  static bool sna_crtc_flip(struct sna *sna, struct sna_crtc *crtc,
> >                           struct kgem_bo *bo, int x, int y);
> > +static void sna_crtc_gamma_set(xf86CrtcPtr crtc,
> > +                              CARD16 *red, CARD16 *green,
> > +                              CARD16 *blue, int size);
> >
> >  static bool is_zaphod(ScrnInfoPtr scrn)
> >  {
> > @@ -3150,11 +3159,9 @@ sna_crtc_set_mode_major(xf86CrtcPtr crtc, DisplayModePtr mode,
> >                mode->VDisplay <= sna->mode.max_crtc_height);
> >
> >  #if HAS_GAMMA
> > -       drmModeCrtcSetGamma(sna->kgem.fd, __sna_crtc_id(sna_crtc),
> > -                           crtc->gamma_size,
> > -                           crtc->gamma_red,
> > -                           crtc->gamma_green,
> > -                           crtc->gamma_blue);
> > +       sna_crtc_gamma_set(crtc,
> > +                          crtc->gamma_red, crtc->gamma_green,
> > +                          crtc->gamma_blue, crtc->gamma_size);
> >  #endif
> >
> >         saved_kmode = sna_crtc->kmode;
> > @@ -3212,12 +3219,44 @@ void sna_mode_adjust_frame(struct sna *sna, int x, int y)
> >
> >  static void
> >  sna_crtc_gamma_set(xf86CrtcPtr crtc,
> > -                      CARD16 *red, CARD16 *green, CARD16 *blue, int size)
> > +                  CARD16 *red, CARD16 *green, CARD16 *blue, int size)
> >  {
> > -       assert(to_sna_crtc(crtc));
> > -       drmModeCrtcSetGamma(to_sna(crtc->scrn)->kgem.fd,
> > -                           sna_crtc_id(crtc),
> > -                           size, red, green, blue);
> > +       struct sna *sna = to_sna(crtc->scrn);
> > +       struct sna_crtc *sna_crtc = to_sna_crtc(crtc);
> > +       struct drm_color_lut *lut = sna_crtc->gamma_lut;
> > +       uint32_t blob_size = size * sizeof(lut[0]);
> > +       uint32_t blob_id;
> > +       int ret, i;
> > +
> > +       DBG(("%s: gamma_size %d\n", __FUNCTION__, size));
> > +
> > +       if (!lut) {
> > +               assert(size == 256);
> > +
> > +               drmModeCrtcSetGamma(to_sna(crtc->scrn)->kgem.fd,
> > +                                   sna_crtc_id(crtc),
> > +                                   size, red, green, blue);
> > +               return;
> > +       }
> > +
> > +       assert(size == sna_crtc->gamma_lut_size);
> > +
> > +       for (i = 0; i < size; i++) {
> > +               lut[i].red = red[i];
> > +               lut[i].green = green[i];
> > +               lut[i].blue = blue[i];
> > +       }
> > +
> > +       ret = drmModeCreatePropertyBlob(sna->kgem.fd, lut, blob_size, &blob_id);
> > +       if (ret)
> > +               return;
> > +
> > +       ret = drmModeObjectSetProperty(sna->kgem.fd,
> > +                                      sna_crtc->id, DRM_MODE_OBJECT_CRTC,
> > +                                      sna_crtc->gamma_lut_prop,
> > +                                      blob_id);
> > +
> > +       drmModeDestroyPropertyBlob(sna->kgem.fd, blob_id);
> >  }
> >
> >  static void
> > @@ -3229,6 +3268,8 @@ sna_crtc_destroy(xf86CrtcPtr crtc)
> >         if (sna_crtc == NULL)
> >                 return;
> >
> > +       free(sna_crtc->gamma_lut);
> > +
> >         list_for_each_entry_safe(sprite, sn, &sna_crtc->sprites, link)
> >                 free(sprite);
> >
> > @@ -3663,6 +3704,55 @@ bool sna_has_sprite_format(struct sna *sna, uint32_t format)
> >         return false;
> >  }
> >
> > +inline static bool prop_is_gamma_lut(const struct drm_mode_get_property *prop)
> > +{
> > +       return prop_has_type_and_name(prop, 4, "GAMMA_LUT");
> > +}
> > +
> > +inline static bool prop_is_gamma_lut_size(const struct drm_mode_get_property *prop)
> > +{
> > +       return prop_has_type_and_name(prop, 1, "GAMMA_LUT_SIZE");
> > +}
> > +
> > +static void sna_crtc_parse_prop(struct sna *sna,
> > +                               struct drm_mode_get_property *prop,
> > +                               uint64_t value, void *data)
> > +{
> > +       struct sna_crtc *crtc = data;
> > +
> > +       if (prop_is_gamma_lut(prop)) {
> > +               crtc->gamma_lut_prop = prop->prop_id;
> > +               crtc->gamma_lut_blob = value;
> > +       } else if (prop_is_gamma_lut_size(prop)) {
> > +               crtc->gamma_lut_size = value;
> > +       }
> > +}
> > +
> > +static void
> > +sna_crtc_init__props(struct sna *sna, struct sna_crtc *crtc)
> > +{
> > +       ScrnInfoPtr scrn = sna->scrn;
> > +
> > +       parse_props(sna, LOCAL_MODE_OBJECT_CRTC, crtc->id,
> > +                   sna_crtc_parse_prop, crtc);
> > +
> > +       /* use high precision gamma LUT for > 8bpc */
> > +       /* X-Server < 1.20 mishandles > 256 slots / > 8 bpc color maps. */
> > +       if (scrn->rgbBits <= 8 ||
> > +           XORG_VERSION_CURRENT < XORG_VERSION_NUMERIC(1,20,0,0,0))
> > +               crtc->gamma_lut_size = 0;
> > +
> 
> One suggestion: Might make sense to print some xf86DrivMsg() info or
> warning message
> to the startup output of the driver [sna_driver.c - sna_pre_init()]
> iff one tries to select a
> X-Screen depth >= 30 aka scrn->rgbBits > 8 on a pre-1.20.0 server, so
> users get some
> hint that they need a 1.20+ server to actually get any extra precision
> out of a depth 30
> screen beyond the 8 bpc of the legacy gamma lut's?

Perhaps. Not sure how many people still on older xservers
would update their ddx though.

> 
> Of course this could also be done in a followup up patch, not to stop
> this from getting merged.

I supoose I can post a followup.

> 
> > +       if (crtc->gamma_lut_size) {
> > +               crtc->gamma_lut = calloc(max(crtc->gamma_lut_size, 256),
> > +                                        sizeof(crtc->gamma_lut[0]));
> > +               if (!crtc->gamma_lut)
> > +                       crtc->gamma_lut_size = 0;
> > +       }
> > +
> > +       DBG(("%s: CRTC:%d, gamma_lut_size=%d\n", __FUNCTION__,
> > +            __sna_crtc_id(crtc), crtc->gamma_lut_size));
> > +}
> > +
> >  static void
> >  sna_crtc_init__rotation(struct sna *sna, struct sna_crtc *crtc)
> >  {
> > @@ -3723,6 +3813,9 @@ sna_crtc_add(ScrnInfoPtr scrn, unsigned id)
> >
> >         list_init(&sna_crtc->sprites);
> >         sna_crtc_init__rotation(sna, sna_crtc);
> > +
> > +       sna_crtc_init__props(sna, sna_crtc);
> > +
> >         sna_crtc_find_planes(sna, sna_crtc);
> >
> >         DBG(("%s: CRTC:%d [pipe=%d], primary id=%x: supported-rotations=%x, current-rotation=%x\n",
> > @@ -7274,36 +7367,110 @@ static void output_set_gamma(xf86OutputPtr output, xf86CrtcPtr crtc)
> >                           mon->mon_gamma_blue);
> >  }
> >
> > +static bool
> > +crtc_get_gamma_lut(xf86CrtcPtr crtc,
> > +                  CARD16 *red, CARD16 *green, CARD16 *blue, int size)
> > +{
> > +
> > +       struct sna *sna = to_sna(crtc->scrn);
> > +       struct sna_crtc *sna_crtc = to_sna_crtc(crtc);
> > +       struct drm_color_lut *lut = sna_crtc->gamma_lut;
> > +       struct drm_mode_get_blob blob;
> > +       int lut_size, i;
> > +
> > +       DBG(("%s: gamma_size %d\n", __FUNCTION__, size));
> > +
> > +       memset(&blob, 0, sizeof(blob));
> > +       blob.blob_id = sna_crtc->gamma_lut_blob;
> > +
> > +       if (drmIoctl(sna->kgem.fd, DRM_IOCTL_MODE_GETPROPBLOB, &blob))
> > +               return false;
> > +
> > +       lut_size = blob.length / sizeof(lut[0]);
> > +
> > +       if (lut_size == 0 ||
> > +           lut_size > max(sna_crtc->gamma_lut_size, 256))
> > +               return false;
> > +
> > +       blob.data = (uintptr_t)lut;
> > +
> > +       if (drmIoctl(sna->kgem.fd, DRM_IOCTL_MODE_GETPROPBLOB, &blob))
> > +               return false;
> > +
> > +       for (i = 0; i < size; i++) {
> > +               struct drm_color_lut *entry =
> > +                       &lut[i * (lut_size - 1) / (size - 1)];
> > +
> > +               red[i] = entry->red;
> > +               green[i] = entry->green;
> > +               blue[i] = entry->blue;
> > +       }
> > +
> > +       return red[size - 1] &&
> > +               green[size - 1] &&
> > +               blue[size - 1];
> > +}
> > +
> > +static bool crtc_get_gamma_legacy(xf86CrtcPtr crtc,
> > +                                 CARD16 *red,
> > +                                 CARD16 *green,
> > +                                 CARD16 *blue,
> > +                                 int size)
> > +{
> > +       struct sna *sna = to_sna(crtc->scrn);
> > +       struct sna_crtc *sna_crtc = to_sna_crtc(crtc);
> > +       struct drm_mode_crtc_lut lut = {
> > +               .crtc_id = __sna_crtc_id(sna_crtc),
> > +               .gamma_size = size,
> > +               .red = (uintptr_t)red,
> > +               .green = (uintptr_t)green,
> > +               .blue = (uintptr_t)blue,
> > +       };
> > +
> > +       if (drmIoctl(sna->kgem.fd, DRM_IOCTL_MODE_GETGAMMA, &lut) != 0)
> > +               return false;
> > +
> > +       VG(VALGRIND_MAKE_MEM_DEFINED(red, size*sizeof(red[0])));
> > +       VG(VALGRIND_MAKE_MEM_DEFINED(green, size*sizeof(green[0])));
> > +       VG(VALGRIND_MAKE_MEM_DEFINED(bluered, size*sizeof(blue[0])));
> 
> Typo in last VALGRIND_MAKE... macro: bluered -> blue

Doh. I guess I didn't actually build this with valgrind enabled.

> 
> Other than that this looks fine and testing on an Ironlake and
> Baytrail gpu under X-Server 1.20 with depth 24 and depth 30 confirms
> it working.

Cool. Thanks for the review and testing.

> 
> With that fix, this patch is
> 
> Reviewed-and-tested-by: Mario Kleiner <mario.kleiner.de@gmail.com>
> 
> Thanks a lot for adding the 10 bpc gamma lut support to the driver and
> also i915-kms for Linux 5.2!
> -mario
> 
> > +
> > +       return red[size - 1] &&
> > +               green[size - 1] &&
> > +               blue[size - 1];
> > +}
> > +
> >  static void crtc_init_gamma(xf86CrtcPtr crtc)
> >  {
> > +       struct sna *sna = to_sna(crtc->scrn);
> > +       struct sna_crtc *sna_crtc = to_sna_crtc(crtc);
> >         uint16_t *gamma;
> > +       int size;
> > +
> > +       assert(sna_crtc);
> > +
> > +       size = sna_crtc->gamma_lut_size;
> > +       if (!size)
> > +               size = 256;
> >
> >         /* Initialize the gamma ramps */
> >         gamma = NULL;
> > -       if (crtc->gamma_size == 256)
> > +       if (crtc->gamma_size == size)
> >                 gamma = crtc->gamma_red;
> >         if (gamma == NULL)
> > -               gamma = malloc(3 * 256 * sizeof(uint16_t));
> > +               gamma = malloc(3 * size * sizeof(uint16_t));
> >         if (gamma) {
> > -               struct sna *sna = to_sna(crtc->scrn);
> > -               struct sna_crtc *sna_crtc = to_sna_crtc(crtc);
> >                 struct drm_mode_crtc_lut lut;
> > -               bool gamma_set = false;
> > +               bool gamma_set;
> > +               uint16_t *red = gamma;
> > +               uint16_t *green = gamma + size;
> > +               uint16_t *blue = gamma + 2 * size;
> >
> > -               assert(sna_crtc);
> > -
> > -               lut.crtc_id = __sna_crtc_id(sna_crtc);
> > -               lut.gamma_size = 256;
> > -               lut.red = (uintptr_t)(gamma);
> > -               lut.green = (uintptr_t)(gamma + 256);
> > -               lut.blue = (uintptr_t)(gamma + 2 * 256);
> > -               if (drmIoctl(sna->kgem.fd, DRM_IOCTL_MODE_GETGAMMA, &lut) == 0) {
> > -                       VG(VALGRIND_MAKE_MEM_DEFINED(gamma, 3*256*sizeof(gamma[0])));
> > -                       gamma_set =
> > -                               gamma[256 - 1] &&
> > -                               gamma[2*256 - 1] &&
> > -                               gamma[3*256 - 1];
> > -               }
> > +               if (sna_crtc->gamma_lut_size)
> > +                       gamma_set = crtc_get_gamma_lut(crtc, red,
> > +                                                      green, blue, size);
> > +               else
> > +                       gamma_set = crtc_get_gamma_legacy(crtc, red,
> > +                                                         green, blue, size);
> >
> >                 DBG(("%s: CRTC:%d, pipe=%d: gamma set?=%d\n",
> >                      __FUNCTION__, __sna_crtc_id(sna_crtc), __sna_crtc_pipe(sna_crtc),
> > @@ -7311,19 +7478,21 @@ static void crtc_init_gamma(xf86CrtcPtr crtc)
> >                 if (!gamma_set) {
> >                         int i;
> >
> > -                       for (i = 0; i < 256; i++) {
> > -                               gamma[i] = i << 8;
> > -                               gamma[256 + i] = i << 8;
> > -                               gamma[2*256 + i] = i << 8;
> > +                       for (i = 0; i < size; i++) {
> > +                               uint16_t val = i * 0xffff / (size - 1);
> > +
> > +                               red[i] = val;
> > +                               green[i] = val;
> > +                               blue[i] = val;
> >                         }
> >                 }
> >
> > -               if (gamma != crtc->gamma_red) {
> > +               if (red != crtc->gamma_red) {
> >                         free(crtc->gamma_red);
> > -                       crtc->gamma_red = gamma;
> > -                       crtc->gamma_green = gamma + 256;
> > -                       crtc->gamma_blue = gamma + 2*256;
> > -                       crtc->gamma_size = 256;
> > +                       crtc->gamma_red = red;
> > +                       crtc->gamma_green = green;
> > +                       crtc->gamma_blue = blue;
> > +                       crtc->gamma_size = size;
> >                 }
> >         }
> >  }
> > --
> > 2.21.0
> >

-- 
Ville Syrjälä
Intel
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