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Thu, 23 Sep 2021 00:07:07 -0700 (PDT) From: Neil Armstrong To: tomba@kernel.org Cc: linux-omap@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, khilman@baylibre.com, Benoit Parrot , Neil Armstrong Subject: [PATCH v5 5/8] drm/omap: Add global state as a private atomic object Date: Thu, 23 Sep 2021 09:06:58 +0200 Message-Id: <20210923070701.145377-6-narmstrong@baylibre.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210923070701.145377-1-narmstrong@baylibre.com> References: <20210923070701.145377-1-narmstrong@baylibre.com> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=6530; i=narmstrong@baylibre.com; h=from:subject; bh=bSg+1BfDSAo3dwQf+G6Jt2gIX5PWaQNLdCzBbuvRQWc=; b=owEBbQKS/ZANAwAKAXfc29rIyEnRAcsmYgBhTCchR26nV3qW8AuUaoQwnqAkIsox28FjcLhgq5bf FIUdDZqJAjMEAAEKAB0WIQQ9U8YmyFYF/h30LIt33NvayMhJ0QUCYUwnIQAKCRB33NvayMhJ0R37D/ wNU0IjIPd77tPKcsxwEDvbnjeklqgFmPTe0r0p+HQwA12XcWmu29xZ8A+9bSfQhApkNBbO3AeG3Szs 6kp3axxnZJCR/UeorBYcVWPH0aaW3nES8H0Ov1mSlxRqWE4RHS856N7xx1UFtagVFrlzL0bP+8PuPX YR9Iqp9gWYqKgR5etWwTPiKO/dglCBXXvHMEdG631fOR3zYBDFNe2OJsc4zAeTJJSQ5upIzbqLzYzE 4ETFlv1W1l+Byw/JZ+egf92KLi/bfQbbxePna8KTmCZ8Nf317YWg0yCxBAgGkKyBxmCl6BhoXnc6sf 9RrEj8/hxOjqI6raBYz/x0wvcUCH9PUrLsgd7krg9Y9BmQL+9jGbSrWIsoGVyPJHZ990bnB/P9vbTq XLp7sRJ0Kw97e0VFhCNKBsJK1hIu03Rcp7L5S8SWufDN4CwtL/PiYY4gJhDWWFUmqw5uJYxnk96JEg ADi7qqPufYLwbfAWVVNob3YIuFc9vBVPul/+NZC5pZZ1aTwzmvEvJ/2r60m1Y/ECET/kj2LRBe/9IG prrMm7Nnvp1geu/RN5By4JYpT5eGZYLWXdtwbsZdFbk/AmRrbIdZ6RTXEnVQYBd5OcJnENfp/wt4PY s8P7dNe9uBaatHPPlLsFD7KmktBvusSTUPZ+YujtNg8oL/b4MRNbETcYFyKA== X-Developer-Key: i=narmstrong@baylibre.com; a=openpgp; fpr=89EC3D058446217450F22848169AB7B1A4CFF8AE Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Benoit Parrot Global shared resources (like hw overlays) for omapdrm are implemented as a part of atomic state using the drm_private_obj infrastructure available in the atomic core. omap_global_state is introduced as a drm atomic private object. The two funcs omap_get_global_state() and omap_get_existing_global_state() are the two variants that will be used to access omap_global_state. drm_mode_config_init() needs to be called earlier because it creates/initializes the private_obj link list maintained by the atomic framework. The private_obj link list has to exist prior to calling drm_atomic_private_obj_init(). Similarly the cleanup handler are reordered appropriately. Signed-off-by: Benoit Parrot Signed-off-by: Neil Armstrong --- drivers/gpu/drm/omapdrm/omap_drv.c | 91 +++++++++++++++++++++++++++++- drivers/gpu/drm/omapdrm/omap_drv.h | 21 +++++++ 2 files changed, 109 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c index b994014b22e8..c7912374d393 100644 --- a/drivers/gpu/drm/omapdrm/omap_drv.c +++ b/drivers/gpu/drm/omapdrm/omap_drv.c @@ -128,6 +128,82 @@ static const struct drm_mode_config_funcs omap_mode_config_funcs = { .atomic_commit = drm_atomic_helper_commit, }; +/* Global/shared object state funcs */ + +/* + * This is a helper that returns the private state currently in operation. + * Note that this would return the "old_state" if called in the atomic check + * path, and the "new_state" after the atomic swap has been done. + */ +struct omap_global_state * +omap_get_existing_global_state(struct omap_drm_private *priv) +{ + return to_omap_global_state(priv->glob_obj.state); +} + +/* + * This acquires the modeset lock set aside for global state, creates + * a new duplicated private object state. + */ +struct omap_global_state *__must_check +omap_get_global_state(struct drm_atomic_state *s) +{ + struct omap_drm_private *priv = s->dev->dev_private; + struct drm_private_state *priv_state; + + priv_state = drm_atomic_get_private_obj_state(s, &priv->glob_obj); + if (IS_ERR(priv_state)) + return ERR_CAST(priv_state); + + return to_omap_global_state(priv_state); +} + +static struct drm_private_state * +omap_global_duplicate_state(struct drm_private_obj *obj) +{ + struct omap_global_state *state; + + state = kmemdup(obj->state, sizeof(*state), GFP_KERNEL); + if (!state) + return NULL; + + __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base); + + return &state->base; +} + +static void omap_global_destroy_state(struct drm_private_obj *obj, + struct drm_private_state *state) +{ + struct omap_global_state *omap_state = to_omap_global_state(state); + + kfree(omap_state); +} + +static const struct drm_private_state_funcs omap_global_state_funcs = { + .atomic_duplicate_state = omap_global_duplicate_state, + .atomic_destroy_state = omap_global_destroy_state, +}; + +static int omap_global_obj_init(struct drm_device *dev) +{ + struct omap_drm_private *priv = dev->dev_private; + struct omap_global_state *state; + + state = kzalloc(sizeof(*state), GFP_KERNEL); + if (!state) + return -ENOMEM; + + drm_atomic_private_obj_init(dev, &priv->glob_obj, &state->base, + &omap_global_state_funcs); + return 0; +} + +static void omap_global_obj_fini(struct omap_drm_private *priv) +{ + drm_atomic_private_obj_fini(&priv->glob_obj); +} + static void omap_disconnect_pipelines(struct drm_device *ddev) { struct omap_drm_private *priv = ddev->dev_private; @@ -231,8 +307,6 @@ static int omap_modeset_init(struct drm_device *dev) if (!omapdss_stack_is_ready()) return -EPROBE_DEFER; - drm_mode_config_init(dev); - ret = omap_modeset_init_properties(dev); if (ret < 0) return ret; @@ -583,10 +657,16 @@ static int omapdrm_init(struct omap_drm_private *priv, struct device *dev) omap_gem_init(ddev); - ret = omap_hwoverlays_init(priv); + drm_mode_config_init(ddev); + + ret = omap_global_obj_init(ddev); if (ret) goto err_gem_deinit; + ret = omap_hwoverlays_init(priv); + if (ret) + goto err_free_priv_obj; + ret = omap_modeset_init(ddev); if (ret) { dev_err(priv->dev, "omap_modeset_init failed: ret=%d\n", ret); @@ -624,7 +704,10 @@ static int omapdrm_init(struct omap_drm_private *priv, struct device *dev) omap_modeset_fini(ddev); err_free_overlays: omap_hwoverlays_destroy(priv); +err_free_priv_obj: + omap_global_obj_fini(priv); err_gem_deinit: + drm_mode_config_cleanup(ddev); omap_gem_deinit(ddev); destroy_workqueue(priv->wq); omap_disconnect_pipelines(ddev); @@ -649,6 +732,8 @@ static void omapdrm_cleanup(struct omap_drm_private *priv) omap_modeset_fini(ddev); omap_hwoverlays_destroy(priv); + omap_global_obj_fini(priv); + drm_mode_config_cleanup(ddev); omap_gem_deinit(ddev); destroy_workqueue(priv->wq); diff --git a/drivers/gpu/drm/omapdrm/omap_drv.h b/drivers/gpu/drm/omapdrm/omap_drv.h index b4d9c2062723..280cdd27bc8e 100644 --- a/drivers/gpu/drm/omapdrm/omap_drv.h +++ b/drivers/gpu/drm/omapdrm/omap_drv.h @@ -14,6 +14,7 @@ #include "dss/omapdss.h" #include "dss/dss.h" +#include #include #include @@ -41,6 +42,15 @@ struct omap_drm_pipeline { unsigned int alias_id; }; +/* + * Global private object state for tracking resources that are shared across + * multiple kms objects (planes/crtcs/etc). + */ +#define to_omap_global_state(x) container_of(x, struct omap_global_state, base) +struct omap_global_state { + struct drm_private_state base; +}; + struct omap_drm_private { struct drm_device *ddev; struct device *dev; @@ -61,6 +71,13 @@ struct omap_drm_private { unsigned int num_ovls; struct omap_hw_overlay *overlays[8]; + /* + * Global private object state, Do not access directly, use + * omap_global_get_state() + */ + struct drm_modeset_lock glob_obj_lock; + struct drm_private_obj glob_obj; + struct drm_fb_helper *fbdev; struct workqueue_struct *wq; @@ -88,5 +105,9 @@ struct omap_drm_private { void omap_debugfs_init(struct drm_minor *minor); +struct omap_global_state *__must_check +omap_get_global_state(struct drm_atomic_state *s); +struct omap_global_state * +omap_get_existing_global_state(struct omap_drm_private *priv); #endif /* __OMAPDRM_DRV_H__ */ -- 2.25.1