drm/kms: add page flipping ioctl

This adds a page flipping ioctl to the KMS API.  The ioctl takes an fb ID
and a ctrc ID and flips the crtc to the given fb at the next vblank.
The ioctl returns immediately but the flip doesn't happen until after
any rendering that's currently queued up against the new framebuffer
is done.  After submitting a page flip, any execbuffer involving the
old front buffer will block until the flip is completed.

Optionally, a vblank event can be generated when the swap eventually
happens.

Signed-off-by: Kristian Høgsberg <krh@bitplanet.net>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 70 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 5cae0b3eee9b..32756e67dd56 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2478,3 +2478,72 @@ out:
         mutex_unlock(&dev->mode_config.mutex);
         return ret;
 }
+
+int drm_mode_page_flip_ioctl(struct drm_device *dev,
+                             void *data, struct drm_file *file_priv)
+{
+        struct drm_mode_crtc_page_flip *page_flip = data;
+        struct drm_mode_object *obj;
+        struct drm_crtc *crtc;
+        struct drm_framebuffer *fb;
+        struct drm_pending_vblank_event *e = NULL;
+        unsigned long flags;
+        int ret = -EINVAL;
+
+        if (page_flip->flags & ~DRM_MODE_PAGE_FLIP_FLAGS ||
+            page_flip->reserved != 0)
+                return -EINVAL;
+
+        mutex_lock(&dev->mode_config.mutex);
+        obj = drm_mode_object_find(dev, page_flip->crtc_id, DRM_MODE_OBJECT_CRTC);
+        if (!obj)
+                goto out;
+        crtc = obj_to_crtc(obj);
+
+        if (crtc->funcs->page_flip == NULL)
+                goto out;
+
+        obj = drm_mode_object_find(dev, page_flip->fb_id, DRM_MODE_OBJECT_FB);
+        if (!obj)
+                goto out;
+        fb = obj_to_fb(obj);
+
+        if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT) {
+                ret = -ENOMEM;
+                spin_lock_irqsave(&dev->event_lock, flags);
+                if (file_priv->event_space < sizeof e->event) {
+                        spin_unlock_irqrestore(&dev->event_lock, flags);
+                        goto out;
+                }
+                file_priv->event_space -= sizeof e->event;
+                spin_unlock_irqrestore(&dev->event_lock, flags);
+
+                e = kzalloc(sizeof *e, GFP_KERNEL);
+                if (e == NULL) {
+                        spin_lock_irqsave(&dev->event_lock, flags);
+                        file_priv->event_space += sizeof e->event;
+                        spin_unlock_irqrestore(&dev->event_lock, flags);
+                        goto out;
+                }
+
+                e->event.base.type = DRM_EVENT_VBLANK;
+                e->event.base.length = sizeof e->event;
+                e->event.user_data = page_flip->user_data;
+                e->base.event = &e->event.base;
+                e->base.file_priv = file_priv;
+                e->base.destroy =
+                        (void (*) (struct drm_pending_event *)) kfree;
+        }
+
+        ret = crtc->funcs->page_flip(crtc, fb, e);
+        if (ret) {
+                spin_lock_irqsave(&dev->event_lock, flags);
+                file_priv->event_space += sizeof e->event;
+                spin_unlock_irqrestore(&dev->event_lock, flags);
+                kfree(e);
+        }
+
+out:
+        mutex_unlock(&dev->mode_config.mutex);
+        return ret;
+}
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 5bd3f9461e2d..bfaf59b02bda 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -145,6 +145,7 @@ static struct drm_ioctl_desc drm_ioctls[] = {
         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_MASTER|DRM_CONTROL_ALLOW),
         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_MASTER|DRM_CONTROL_ALLOW),
         DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_MASTER|DRM_CONTROL_ALLOW),
+        DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW),
 };
 
 #define DRM_CORE_IOCTL_COUNT    ARRAY_SIZE( drm_ioctls )