systemd/0481-terminal-grdev-allow-arbitrary-fb-age-contexts.patch

From 66695cc343647dcbf654fbb4b3f38bd1ee092a0d Mon Sep 17 00:00:00 2001
From: David Herrmann <dh.herrmann@gmail.com>
Date: Thu, 2 Oct 2014 18:47:01 +0200
Subject: [PATCH] terminal/grdev: allow arbitrary fb-age contexts

Instead of limiting fb-aging to 64bit integers, allow any arbitrary
context together with a release function to free it once the FB is
destroyed.
---
 src/libsystemd-terminal/grdev-drm.c |  3 +++
 src/libsystemd-terminal/grdev.c     | 11 +----------
 src/libsystemd-terminal/grdev.h     | 14 ++++++++++----
 src/libsystemd-terminal/modeset.c   |  2 +-
 4 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/src/libsystemd-terminal/grdev-drm.c b/src/libsystemd-terminal/grdev-drm.c
index 57b930bc0f..f01df1dae2 100644
--- a/src/libsystemd-terminal/grdev-drm.c
+++ b/src/libsystemd-terminal/grdev-drm.c
@@ -1442,6 +1442,9 @@ grdrm_fb *grdrm_fb_free(grdrm_fb *fb) {
 
         assert(fb->card);
 
+        if (fb->base.free_fn)
+                fb->base.free_fn(fb->base.data.ptr);
+
         if (fb->id > 0 && fb->card->fd >= 0) {
                 r = ioctl(fb->card->fd, DRM_IOCTL_MODE_RMFB, fb->id);
                 if (r < 0)
diff --git a/src/libsystemd-terminal/grdev.c b/src/libsystemd-terminal/grdev.c
index a700a7316b..0c21eac551 100644
--- a/src/libsystemd-terminal/grdev.c
+++ b/src/libsystemd-terminal/grdev.c
@@ -393,28 +393,19 @@ const grdev_display_target *grdev_display_next_target(grdev_display *display, co
         return NULL;
 }
 
-void grdev_display_flip_target(grdev_display *display, const grdev_display_target *target, uint64_t age) {
+void grdev_display_flip_target(grdev_display *display, const grdev_display_target *target) {
         grdev_display_cache *cache;
-        size_t i;
 
         assert(display);
         assert(!display->modified);
         assert(display->enabled);
         assert(target);
-        assert(target->back);
 
         cache = container_of(target, grdev_display_cache, target);
 
         assert(cache->pipe);
         assert(cache->pipe->tile->display == display);
 
-        /* reset age of all FB on overflow */
-        if (age < target->back->age)
-                for (i = 0; i < cache->pipe->max_fbs; ++i)
-                        if (cache->pipe->fbs[i])
-                                cache->pipe->fbs[i]->age = 0;
-
-        ((grdev_fb*)target->back)->age = age;
         cache->pipe->flip = true;
 }
 
diff --git a/src/libsystemd-terminal/grdev.h b/src/libsystemd-terminal/grdev.h
index ca0373ed29..35d6eb2abf 100644
--- a/src/libsystemd-terminal/grdev.h
+++ b/src/libsystemd-terminal/grdev.h
@@ -93,9 +93,15 @@ struct grdev_fb {
         uint32_t width;
         uint32_t height;
         uint32_t format;
-        uint64_t age;
         int32_t strides[4];
         void *maps[4];
+
+        union {
+                void *ptr;
+                uint64_t u64;
+        } data;
+
+        void (*free_fn) (void *ptr);
 };
 
 struct grdev_display_target {
@@ -105,8 +111,8 @@ struct grdev_display_target {
         uint32_t height;
         unsigned int rotate;
         unsigned int flip;
-        const grdev_fb *front;
-        const grdev_fb *back;
+        grdev_fb *front;
+        grdev_fb *back;
 };
 
 void grdev_display_set_userdata(grdev_display *display, void *userdata);
@@ -121,7 +127,7 @@ void grdev_display_enable(grdev_display *display);
 void grdev_display_disable(grdev_display *display);
 
 const grdev_display_target *grdev_display_next_target(grdev_display *display, const grdev_display_target *prev);
-void grdev_display_flip_target(grdev_display *display, const grdev_display_target *target, uint64_t age);
+void grdev_display_flip_target(grdev_display *display, const grdev_display_target *target);
 
 #define GRDEV_DISPLAY_FOREACH_TARGET(_display, _t)                      \
         for ((_t) = grdev_display_next_target((_display), NULL);        \
diff --git a/src/libsystemd-terminal/modeset.c b/src/libsystemd-terminal/modeset.c
index 2f8860dd5f..f5be38e4fa 100644
--- a/src/libsystemd-terminal/modeset.c
+++ b/src/libsystemd-terminal/modeset.c
@@ -258,7 +258,7 @@ static void modeset_render(Modeset *m, grdev_display *d) {
 
         GRDEV_DISPLAY_FOREACH_TARGET(d, t) {
                 modeset_draw(m, t);
-                grdev_display_flip_target(d, t, 1);
+                grdev_display_flip_target(d, t);
         }
 
         grdev_session_commit(m->grdev_session);