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Sat, 21 Dec 2024 21:00:50 -0800 (PST) From: Dmitry Baryshkov Date: Sun, 22 Dec 2024 07:00:42 +0200 Subject: [PATCH 2/6] drm/atomic: prepare to check that drivers follow restrictions for needs_modeset Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241222-drm-dirty-modeset-v1-2-0e76a53eceb9@linaro.org> References: <20241222-drm-dirty-modeset-v1-0-0e76a53eceb9@linaro.org> In-Reply-To: <20241222-drm-dirty-modeset-v1-0-0e76a53eceb9@linaro.org> To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Clark , Abhinav Kumar , Sean Paul , Marijn Suijten , Chandan Uddaraju , Jeykumar Sankaran , Jordan Crouse , Sravanthi Kollukuduru Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Archit Taneja , Rajesh Yadav , linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Simona Vetter X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=8180; i=dmitry.baryshkov@linaro.org; h=from:subject:message-id; bh=rWS0KFUVLvGb4ozb2+QIr1gzxcTnVRN9cNSrdc5NX8g=; b=owEBbQGS/pANAwAKAYs8ij4CKSjVAcsmYgBnZ5z71Xj3vDZ5ZQ9k5EaVm/6pV22nfsxOppXU8 urExzv+o8yJATMEAAEKAB0WIQRMcISVXLJjVvC4lX+LPIo+Aiko1QUCZ2ec+wAKCRCLPIo+Aiko 1eDjCACEaoaRFJsbhJHmjd3uHaWnQCQA3aWQKHzRvFrDf7Em7z0Gao1tpDPETltMg4hGw9imGF/ PtpGBoPGrff7Mf6/fSkZQKcBzyk2nds6Pmm41ImFPilCfg57s70TvJ8b+yRs7SbYd5G+gxE3MYU voHPno59UMWls4TEyjlcckMmilATWZhT4Cj08xSb97FrGuAV9e5lrX4zzr1U3eyh5LCkSiI51XI xi2ZSJf2Kv+8y9J1HtkLW5kPgrILGaBg3asKa4+mIqDhnDxCFNZK1MtdHv6AHrqXUA+gI/jpJit nXQgHSxtMdjeuCSaRaKgyoclkm4lYv7wxwWyAT9xRjrT6Gst X-Developer-Key: i=dmitry.baryshkov@linaro.org; a=openpgp; fpr=8F88381DD5C873E4AE487DA5199BF1243632046A Some drivers might fail to follow the restrictions documented for drm_atomic_helper_check_modesets(). In order to catch such an issues, add the drm_atomic_state->dirty_needs_modeset field and check it in drm_atomic_check_only(). Make sure that neither of atomic_check() callbacks can set that field without calling drm_atomic_helper_check_modesets() again. Suggested-by: Simona Vetter Signed-off-by: Dmitry Baryshkov --- drivers/gpu/drm/drm_atomic.c | 3 ++ drivers/gpu/drm/drm_atomic_helper.c | 77 +++++++++++++++++++++++++++++++++---- include/drm/drm_atomic.h | 10 +++++ 3 files changed, 82 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 9ea2611770f43ce7ccba410406d5f2c528aab022..202e4e64bd31921d0a4d4b86605b501311e14c33 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -1449,6 +1449,9 @@ int drm_atomic_check_only(struct drm_atomic_state *state) } } + WARN_RATELIMIT(state->dirty_needs_modeset, + "Driver changed needs_modeset under drm_atomic_helper_check_modeset()"); + if (!state->allow_modeset) { for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) { if (drm_atomic_crtc_needs_modeset(new_crtc_state)) { diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index f26887c3fe8b194137200f9f2426653274c50fda..2c62840416f4b807d6a880b5c30ae024a16af528 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -433,6 +433,7 @@ mode_fixup(struct drm_atomic_state *state) for_each_new_connector_in_state(state, connector, new_conn_state, i) { const struct drm_encoder_helper_funcs *funcs; + bool old_needs_modeset = false; struct drm_encoder *encoder; struct drm_bridge *bridge; @@ -451,6 +452,9 @@ mode_fixup(struct drm_atomic_state *state) encoder = new_conn_state->best_encoder; funcs = encoder->helper_private; + if (new_crtc_state) + old_needs_modeset = drm_atomic_crtc_needs_modeset(new_crtc_state); + bridge = drm_bridge_chain_get_first_bridge(encoder); ret = drm_atomic_bridge_chain_check(bridge, new_crtc_state, @@ -479,6 +483,12 @@ mode_fixup(struct drm_atomic_state *state) return -EINVAL; } } + + if (new_crtc_state) { + bool new_needs_modeset = drm_atomic_crtc_needs_modeset(new_crtc_state); + + state->dirty_needs_modeset |= (new_needs_modeset != old_needs_modeset); + } } for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) { @@ -574,6 +584,36 @@ mode_valid(struct drm_atomic_state *state) return 0; } +static int +connector_atomic_check(struct drm_atomic_state *state, + struct drm_connector *connector, + struct drm_connector_state *old_connector_state, + struct drm_connector_state *new_connector_state) +{ + const struct drm_connector_helper_funcs *funcs = connector->helper_private; + struct drm_crtc_state *new_crtc_state; + bool old_needs_modeset = false; + int ret; + + if (new_connector_state->crtc) + new_crtc_state = drm_atomic_get_new_crtc_state(state, new_connector_state->crtc); + if (new_crtc_state) + old_needs_modeset = drm_atomic_crtc_needs_modeset(new_crtc_state); + + if (funcs->atomic_check) + ret = funcs->atomic_check(connector, state); + else + ret = 0; + + if (new_crtc_state) { + bool new_needs_modeset = drm_atomic_crtc_needs_modeset(new_crtc_state); + + state->dirty_needs_modeset |= (new_needs_modeset != old_needs_modeset); + } + + return ret; +} + /** * drm_atomic_helper_check_modeset - validate state object for modeset changes * @dev: DRM device @@ -628,6 +668,8 @@ drm_atomic_helper_check_modeset(struct drm_device *dev, int i, ret; unsigned int connectors_mask = 0, user_connectors_mask = 0; + state->dirty_needs_modeset = false; + for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) user_connectors_mask |= BIT(i); @@ -683,8 +725,6 @@ drm_atomic_helper_check_modeset(struct drm_device *dev, return ret; for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) { - const struct drm_connector_helper_funcs *funcs = connector->helper_private; - WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); /* @@ -710,8 +750,8 @@ drm_atomic_helper_check_modeset(struct drm_device *dev, new_crtc_state->connectors_changed = true; } - if (funcs->atomic_check) - ret = funcs->atomic_check(connector, state); + ret = connector_atomic_check(state, connector, + old_connector_state, new_connector_state); if (ret) { drm_dbg_atomic(dev, "[CONNECTOR:%d:%s] driver check failed\n", @@ -752,13 +792,11 @@ drm_atomic_helper_check_modeset(struct drm_device *dev, * has been called on them when a modeset is forced. */ for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) { - const struct drm_connector_helper_funcs *funcs = connector->helper_private; - if (connectors_mask & BIT(i)) continue; - if (funcs->atomic_check) - ret = funcs->atomic_check(connector, state); + ret = connector_atomic_check(state, connector, + old_connector_state, new_connector_state); if (ret) { drm_dbg_atomic(dev, "[CONNECTOR:%d:%s] driver check failed\n", @@ -994,6 +1032,7 @@ drm_atomic_helper_check_planes(struct drm_device *dev, for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) { const struct drm_plane_helper_funcs *funcs; + bool old_needs_modeset = false; WARN_ON(!drm_modeset_is_locked(&plane->mutex)); @@ -1006,6 +1045,12 @@ drm_atomic_helper_check_planes(struct drm_device *dev, if (!funcs || !funcs->atomic_check) continue; + if (new_plane_state->crtc) + new_crtc_state = drm_atomic_get_new_crtc_state(state, + new_plane_state->crtc); + if (new_crtc_state) + old_needs_modeset = drm_atomic_crtc_needs_modeset(new_crtc_state); + ret = funcs->atomic_check(plane, state); if (ret) { drm_dbg_atomic(plane->dev, @@ -1013,16 +1058,26 @@ drm_atomic_helper_check_planes(struct drm_device *dev, plane->base.id, plane->name); return ret; } + + if (new_crtc_state) { + bool new_needs_modeset = drm_atomic_crtc_needs_modeset(new_crtc_state); + + state->dirty_needs_modeset |= (new_needs_modeset != old_needs_modeset); + } } for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) { const struct drm_crtc_helper_funcs *funcs; + bool old_needs_modeset = false; funcs = crtc->helper_private; if (!funcs || !funcs->atomic_check) continue; + if (new_crtc_state) + old_needs_modeset = drm_atomic_crtc_needs_modeset(new_crtc_state); + ret = funcs->atomic_check(crtc, state); if (ret) { drm_dbg_atomic(crtc->dev, @@ -1030,6 +1085,12 @@ drm_atomic_helper_check_planes(struct drm_device *dev, crtc->base.id, crtc->name); return ret; } + + if (new_crtc_state) { + bool new_needs_modeset = drm_atomic_crtc_needs_modeset(new_crtc_state); + + state->dirty_needs_modeset |= (new_needs_modeset != old_needs_modeset); + } } return ret; diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h index 31ca88deb10d262fb3a3f8e14d2afe24f8410cb1..7b0dbd3c8a3df340399a458aaf79263f0fdc24e5 100644 --- a/include/drm/drm_atomic.h +++ b/include/drm/drm_atomic.h @@ -408,6 +408,16 @@ struct drm_atomic_state { */ bool duplicated : 1; + /** + * @dirty_needs_modeset: + * + * Indicates whether the drm_atomic_crtc_needs_modeset() changed in an + * unexpected way. Usually this means that driver implements atomic + * helpers using drm_atomic_crtc_needs_modeset(), but mode_changed has + * toggled by one of its atomic_check() callbacks. + */ + bool dirty_needs_modeset : 1; + /** * @planes: *