From 0df10823743311f31a067c26e2a3c6fa6dc867e9 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Tue, 11 Feb 2020 18:22:07 +0200 Subject: [PATCH] drm: Validate encoder->possible_crtcs MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit WARN if the encoder possible_crtcs is effectively empty or contains bits for non-existing crtcs. v2: Move to drm_mode_config_validate() (Daniel) Make the docs say we WARN when this is wrong (Daniel) Extract full_crtc_mask() Cc: Thomas Zimmermann Cc: Daniel Vetter Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20200211162208.16224-7-ville.syrjala@linux.intel.com Reviewed-by: Daniel Vetter --- drivers/gpu/drm/drm_mode_config.c | 27 ++++++++++++++++++++++++++- include/drm/drm_encoder.h | 2 +- 2 files changed, 27 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c index 4099a626324a..55322d7048f5 100644 --- a/drivers/gpu/drm/drm_mode_config.c +++ b/drivers/gpu/drm/drm_mode_config.c @@ -581,6 +581,29 @@ static void validate_encoder_possible_clones(struct drm_encoder *encoder) encoder->possible_clones, encoder_mask); } +static u32 full_crtc_mask(struct drm_device *dev) +{ + struct drm_crtc *crtc; + u32 crtc_mask = 0; + + drm_for_each_crtc(crtc, dev) + crtc_mask |= drm_crtc_mask(crtc); + + return crtc_mask; +} + +static void validate_encoder_possible_crtcs(struct drm_encoder *encoder) +{ + u32 crtc_mask = full_crtc_mask(encoder->dev); + + WARN((encoder->possible_crtcs & crtc_mask) == 0 || + (encoder->possible_crtcs & ~crtc_mask) != 0, + "Bogus possible_crtcs: " + "[ENCODER:%d:%s] possible_crtcs=0x%x (full crtc mask=0x%x)\n", + encoder->base.id, encoder->name, + encoder->possible_crtcs, crtc_mask); +} + void drm_mode_config_validate(struct drm_device *dev) { struct drm_encoder *encoder; @@ -588,6 +611,8 @@ void drm_mode_config_validate(struct drm_device *dev) drm_for_each_encoder(encoder, dev) fixup_encoder_possible_clones(encoder); - drm_for_each_encoder(encoder, dev) + drm_for_each_encoder(encoder, dev) { validate_encoder_possible_clones(encoder); + validate_encoder_possible_crtcs(encoder); + } } diff --git a/include/drm/drm_encoder.h b/include/drm/drm_encoder.h index 9d11cbe22f34..a60f5f1555ac 100644 --- a/include/drm/drm_encoder.h +++ b/include/drm/drm_encoder.h @@ -142,7 +142,7 @@ struct drm_encoder { * the bits for all &drm_crtc objects this encoder can be connected to * before calling drm_dev_register(). * - * In reality almost every driver gets this wrong. + * You will get a WARN if you get this wrong in the driver. * * Note that since CRTC objects can't be hotplugged the assigned indices * are stable and hence known before registering all objects. -- 2.11.0