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Message-ID: <1fd3dc84-02ee-48fc-1db7-47cdd1ce2e4e@molgen.mpg.de>
Date: Fri, 29 Oct 2021 09:48:07 +0200
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Mark Yacoub <markyacoub@...omium.org>
Cc: seanpaul@...omium.org, Mark Yacoub <markyacoub@...gle.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Matthias Brugger <matthias.bgg@...il.com>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
intel-gfx@...ts.freedesktop.org,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v3 2/3] drm: Add Gamma and Degamma LUT sizes props to
drm_crtc to validate.
Dear Mark,
On 26.10.21 21:21, Mark Yacoub wrote:
> From: Mark Yacoub <markyacoub@...gle.com>
>
> [Why]
> 1. drm_atomic_helper_check doesn't check for the LUT sizes of either Gamma
> or Degamma props in the new CRTC state, allowing any invalid size to
> be passed on.
> 2. Each driver has its own LUT size, which could also be different for
> legacy users.
>
> [How]
> 1. Create |degamma_lut_size| and |gamma_lut_size| to save the LUT sizes
> assigned by the driver when it's initializing its color and CTM
> management.
> 2. Create drm_atomic_helper_check_crtc which is called by
> drm_atomic_helper_check to check the LUT sizes saved in drm_crtc that
> they match the sizes in the new CRTC state.
> 3. As the LUT size check now happens in drm_atomic_helper_check, remove
> the lut check in intel_color.c
>
> Resolves: igt@..._color@...e-A-invalid-gamma-lut-sizes on MTK
> Tested on Zork(amdgpu) and Jacuzzi(mediatek), volteer(TGL)
If you should sent another iteration, only a minor thing, could you
please add a space before the (.
>
> v2:
> 1. Remove the rename to a parent commit.
> 2. Create a drm drm_check_lut_size instead of intel only function.
>
> v1:
> 1. Fix typos
> 2. Remove the LUT size check from intel driver
> 3. Rename old LUT check to indicate it's a channel change
>
> Signed-off-by: Mark Yacoub <markyacoub@...omium.org>
> ---
> drivers/gpu/drm/drm_atomic_helper.c | 56 ++++++++++++++++++++++
> drivers/gpu/drm/drm_color_mgmt.c | 2 +
> drivers/gpu/drm/i915/display/intel_color.c | 39 ++++++++-------
> include/drm/drm_atomic_helper.h | 1 +
> include/drm/drm_color_mgmt.h | 13 +++++
> include/drm/drm_crtc.h | 11 +++++
> 6 files changed, 102 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index bc3487964fb5e..c565b3516cce9 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -929,6 +929,58 @@ drm_atomic_helper_check_planes(struct drm_device *dev,
> }
> EXPORT_SYMBOL(drm_atomic_helper_check_planes);
>
> +/**
> + * drm_atomic_helper_check_crtcs - validate state object for CRTC changes
> + * @state: the driver state object
> + *
> + * Check the CRTC state object such as the Gamma/Degamma LUT sizes if the new
> + * state holds them.
> + *
> + * RETURNS:
> + * Zero for success or -errno
> + */
> +int drm_atomic_helper_check_crtcs(struct drm_atomic_state *state)
> +{
> + struct drm_crtc *crtc;
> + struct drm_crtc_state *new_crtc_state;
> + int i;
> +
> + for_each_new_crtc_in_state (state, crtc, new_crtc_state, i) {
> + if (new_crtc_state->color_mgmt_changed &&
> + new_crtc_state->gamma_lut) {
> + if (drm_check_lut_size(new_crtc_state->gamma_lut,
> + crtc->gamma_lut_size) ||
> + drm_check_lut_size(new_crtc_state->gamma_lut,
> + crtc->gamma_size)) {
> + drm_dbg_state(
> + state->dev,
> + "Invalid Gamma LUT size. Should be %u (or %u for legacy) but got %u.\n",
> + crtc->gamma_lut_size, crtc->gamma_size,
> + drm_color_lut_size(
> + new_crtc_state->gamma_lut));
> + return -EINVAL;
> + }
> + }
> +
> + if (new_crtc_state->color_mgmt_changed &&
> + new_crtc_state->degamma_lut) {
> + if (drm_check_lut_size(new_crtc_state->degamma_lut,
> + crtc->degamma_lut_size)) {
> + drm_dbg_state(
> + state->dev,
> + "Invalid DeGamma LUT size. Should be %u but got %u.\n",
> + crtc->degamma_lut_size,
> + drm_color_lut_size(
> + new_crtc_state->degamma_lut));
> + return -EINVAL;
> + }
> + }
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_atomic_helper_check_crtcs);
> +
> /**
> * drm_atomic_helper_check - validate state object
> * @dev: DRM device
> @@ -974,6 +1026,10 @@ int drm_atomic_helper_check(struct drm_device *dev,
> if (ret)
> return ret;
>
> + ret = drm_atomic_helper_check_crtcs(state);
> + if (ret)
> + return ret;
> +
> if (state->legacy_cursor_update)
> state->async_update = !drm_atomic_helper_async_check(dev, state);
>
> diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c
> index 6f4e04746d90f..6bb59645a75bc 100644
> --- a/drivers/gpu/drm/drm_color_mgmt.c
> +++ b/drivers/gpu/drm/drm_color_mgmt.c
> @@ -166,6 +166,7 @@ void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
> struct drm_mode_config *config = &dev->mode_config;
>
> if (degamma_lut_size) {
> + crtc->degamma_lut_size = degamma_lut_size;
> drm_object_attach_property(&crtc->base,
> config->degamma_lut_property, 0);
> drm_object_attach_property(&crtc->base,
> @@ -178,6 +179,7 @@ void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
> config->ctm_property, 0);
>
> if (gamma_lut_size) {
> + crtc->gamma_lut_size = gamma_lut_size;
> drm_object_attach_property(&crtc->base,
> config->gamma_lut_property, 0);
> drm_object_attach_property(&crtc->base,
> diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
> index 4bb1bc76c4de9..888886d2936f8 100644
> --- a/drivers/gpu/drm/i915/display/intel_color.c
> +++ b/drivers/gpu/drm/i915/display/intel_color.c
> @@ -1262,23 +1262,6 @@ intel_color_add_affected_planes(struct intel_crtc_state *new_crtc_state)
> return 0;
> }
>
> -static int check_lut_size(const struct drm_property_blob *lut, int expected)
> -{
> - int len;
> -
> - if (!lut)
> - return 0;
> -
> - len = drm_color_lut_size(lut);
> - if (len != expected) {
> - DRM_DEBUG_KMS("Invalid LUT size; got %d, expected %d\n",
> - len, expected);
> - return -EINVAL;
> - }
> -
> - return 0;
> -}
> -
> static int check_luts(const struct intel_crtc_state *crtc_state)
> {
> struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
> @@ -1303,9 +1286,25 @@ static int check_luts(const struct intel_crtc_state *crtc_state)
> degamma_channels_tests = INTEL_INFO(dev_priv)->color.degamma_lut_tests;
> gamma_channels_tests = INTEL_INFO(dev_priv)->color.gamma_lut_tests;
>
> - if (check_lut_size(degamma_lut, degamma_length) ||
> - check_lut_size(gamma_lut, gamma_length))
> - return -EINVAL;
> + if (degamma_lut) {
> + if (drm_check_lut_size(degamma_lut, degamma_length)) {
> + drm_dbg_state(
> + &dev_priv->drm,
> + "Invalid DeGamma LUT size. Should be %u but got %u.\n",
> + degamma_length,
> + drm_color_lut_size(degamma_lut));
> + return -EINVAL;
> + }
> + }
> + if (gamma_lut) {
> + if (drm_check_lut_size(gamma_lut, degamma_length)) {
> + drm_dbg_state(
> + &dev_priv->drm,
> + "Invalid Gamma LUT size. Should be %u but got %u.\n",
> + degamma_length, drm_color_lut_size(gamma_lut));
> + return -EINVAL;
> + }
> + }
>
> if (drm_color_lut_channels_check(degamma_lut, degamma_channels_tests) ||
> drm_color_lut_channels_check(gamma_lut, gamma_channels_tests))
> diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
> index 4045e2507e11c..a22d32a7a8719 100644
> --- a/include/drm/drm_atomic_helper.h
> +++ b/include/drm/drm_atomic_helper.h
> @@ -38,6 +38,7 @@ struct drm_atomic_state;
> struct drm_private_obj;
> struct drm_private_state;
>
> +int drm_atomic_helper_check_crtcs(struct drm_atomic_state *state);
> int drm_atomic_helper_check_modeset(struct drm_device *dev,
> struct drm_atomic_state *state);
> int drm_atomic_helper_check_plane_state(struct drm_plane_state *plane_state,
> diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h
> index cb1bf361ad3e3..c214812d1b7a5 100644
> --- a/include/drm/drm_color_mgmt.h
> +++ b/include/drm/drm_color_mgmt.h
> @@ -74,6 +74,19 @@ static inline int drm_color_lut_size(const struct drm_property_blob *blob)
> return blob->length / sizeof(struct drm_color_lut);
> }
>
> +/**
> + * drm_check_lut_size - Checks if LUT size matches the driver expected size.
> + * @lut: blob containing the LUT
> + * @expected_size: driver expected LUT size
> + *
> + * Returns -EINVAL on mismatch, 0 on match.
> + */
> +static inline int drm_check_lut_size(const struct drm_property_blob *lut,
> + uint64_t expected_size)
> +{
> + return drm_color_lut_size(lut) != expected_size ? -EINVAL : 0;
> +}
> +
> enum drm_color_encoding {
> DRM_COLOR_YCBCR_BT601,
> DRM_COLOR_YCBCR_BT709,
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index 2deb15d7e1610..cabd3ef1a6e32 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -1072,6 +1072,17 @@ struct drm_crtc {
> /** @funcs: CRTC control functions */
> const struct drm_crtc_funcs *funcs;
>
> + /**
> + * @degamma_lut_size: Size of degamma LUT.
> + */
> + uint32_t degamma_lut_size;
Why not use size_t?
> +
> + /**
> + * @gamma_lut_size: Size of Gamma LUT. Not used by legacy userspace such as
> + * X, which doesn't support large lut sizes.
> + */
> + uint32_t gamma_lut_size;
> +
> /**
> * @gamma_size: Size of legacy gamma ramp reported to userspace. Set up
> * by calling drm_mode_crtc_set_gamma_size().
>
Kind regards,
Paul
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