drm/msm: subclass drm_atomic_state

This will give the kms backends a slot to stash their own hw specific
global state.

Signed-off-by: Rob Clark <robdclark@gmail.com>

4 files changed, 51 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
index 4e21e1d72378..30b5d23e53b4 100644
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -241,6 +241,10 @@ int msm_atomic_commit(struct drm_device *dev,
 
         drm_atomic_helper_swap_state(state, true);
 
+        /* swap driver private state while still holding state_lock */
+        if (to_kms_state(state)->state)
+                priv->kms->funcs->swap_state(priv->kms, state);
+
         /*
          * Everything below can be run asynchronously without the need to grab
          * any modeset locks at all under one conditions: It must be guaranteed
@@ -271,3 +275,30 @@ error:
         drm_atomic_helper_cleanup_planes(dev, state);
         return ret;
 }
+
+struct drm_atomic_state *msm_atomic_state_alloc(struct drm_device *dev)
+{
+        struct msm_kms_state *state = kzalloc(sizeof(*state), GFP_KERNEL);
+
+        if (!state || drm_atomic_state_init(dev, &state->base) < 0) {
+                kfree(state);
+                return NULL;
+        }
+
+        return &state->base;
+}
+
+void msm_atomic_state_clear(struct drm_atomic_state *s)
+{
+        struct msm_kms_state *state = to_kms_state(s);
+        drm_atomic_state_default_clear(&state->base);
+        kfree(state->state);
+        state->state = NULL;
+}
+
+void msm_atomic_state_free(struct drm_atomic_state *state)
+{
+        kfree(to_kms_state(state)->state);
+        drm_atomic_state_default_release(state);
+        kfree(state);
+}
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index c740eaf9272b..aa41d8dd623b 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -46,6 +46,9 @@ static const struct drm_mode_config_funcs mode_config_funcs = {
         .output_poll_changed = msm_fb_output_poll_changed,
         .atomic_check = msm_atomic_check,
         .atomic_commit = msm_atomic_commit,
+        .atomic_state_alloc = msm_atomic_state_alloc,
+        .atomic_state_clear = msm_atomic_state_clear,
+        .atomic_state_free = msm_atomic_state_free,
 };
 
 int msm_register_address_space(struct drm_device *dev,
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 03ce6a18ac40..175b2bfae5e1 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -179,6 +179,9 @@ int msm_atomic_check(struct drm_device *dev,
                      struct drm_atomic_state *state);
 int msm_atomic_commit(struct drm_device *dev,
                 struct drm_atomic_state *state, bool nonblock);
+struct drm_atomic_state *msm_atomic_state_alloc(struct drm_device *dev);
+void msm_atomic_state_clear(struct drm_atomic_state *state);
+void msm_atomic_state_free(struct drm_atomic_state *state);
 
 int msm_register_address_space(struct drm_device *dev,
                 struct msm_gem_address_space *aspace);
diff --git a/drivers/gpu/drm/msm/msm_kms.h b/drivers/gpu/drm/msm/msm_kms.h
index 40e41e5cdbc6..cb9758bcadfd 100644
--- a/drivers/gpu/drm/msm/msm_kms.h
+++ b/drivers/gpu/drm/msm/msm_kms.h
@@ -40,6 +40,8 @@ struct msm_kms_funcs {
         irqreturn_t (*irq)(struct msm_kms *kms);
         int (*enable_vblank)(struct msm_kms *kms, struct drm_crtc *crtc);
         void (*disable_vblank)(struct msm_kms *kms, struct drm_crtc *crtc);
+        /* swap global atomic state: */
+        void (*swap_state)(struct msm_kms *kms, struct drm_atomic_state *state);
         /* modeset, bracketing atomic_commit(): */
         void (*prepare_commit)(struct msm_kms *kms, struct drm_atomic_state *state);
         void (*complete_commit)(struct msm_kms *kms, struct drm_atomic_state *state);
@@ -65,6 +67,18 @@ struct msm_kms {
         int irq;
 };
 
+/**
+ * Subclass of drm_atomic_state, to allow kms backend to have driver
+ * private global state.  The kms backend can do whatever it wants
+ * with the ->state ptr.  On ->atomic_state_clear() the ->state ptr
+ * is kfree'd and set back to NULL.
+ */
+struct msm_kms_state {
+        struct drm_atomic_state base;
+        void *state;
+};
+#define to_kms_state(x) container_of(x, struct msm_kms_state, base)
+
 static inline void msm_kms_init(struct msm_kms *kms,
                 const struct msm_kms_funcs *funcs)
 {