[14/16] drm: Atomic modeset ioctl

Commit Message

Rob Clark March 18, 2014, 9:22 p.m. UTC

From: Ville Syrjälä <[e-mail]>

The atomic modeset ioctl cna be used to push any number of new values
for object properties. The driver can then check the full device
configuration as single unit, and try to apply the changes atomically.

The ioctl simply takes a list of object IDs and property IDs and their
values. For setting values to blob properties, the property value
indicates the length of the data, and the actual data is passed via
another blob pointer.

The caller can demand non-blocking operation from the ioctl, and if the
driver can't satisfy that requirement an error will be returned.

The caller can also request to receive asynchronous completion events
after the operation has reached the hardware. An event is sent for each
object specified by the caller, whether or not the actual state of
that object changed. Each event also carries a framebuffer ID, which
indicates to user space that the specified object is no longer
accessing that framebuffer.

Signed-off-by: Ville Syrjälä <[e-mail]>
---
 drivers/gpu/drm/drm_crtc.c  | 156 ++++++++++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/drm_drv.c   |   1 +
 include/drm/drmP.h          |   6 ++
 include/drm/drm_crtc.h      |   2 +
 include/uapi/drm/drm.h      |  12 ++++
 include/uapi/drm/drm_mode.h |  20 ++++++
 6 files changed, 197 insertions(+)

Patch

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index e5bcee7..9f2db6c 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -4877,3 +4877,159 @@  void drm_mode_config_cleanup(struct drm_device *dev)
 	idr_destroy(&dev->mode_config.crtc_idr);
 }
 EXPORT_SYMBOL(drm_mode_config_cleanup);
+
+int drm_mode_atomic_ioctl(struct drm_device *dev,
+			  void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_atomic *arg = data;
+	uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
+	uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
+	uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
+	uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
+	uint64_t __user *blob_values_ptr = (uint64_t __user *)(unsigned long)(arg->blob_values_ptr);
+	unsigned int copied_objs, copied_props, copied_blobs;
+	void *state;
+	int ret = 0;
+	unsigned int i, j;
+
+	if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS)
+		return -EINVAL;
+
+	/* can't test and expect an event at the same time. */
+	if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
+			(arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
+		return -EINVAL;
+
+retry:
+	copied_objs = 0;
+	copied_props = 0;
+	copied_blobs = 0;
+
+	state = dev->driver->atomic_begin(dev, arg->flags);
+	if (IS_ERR(state)) {
+		ret = PTR_ERR(state);
+		goto out;
+	}
+
+	for (i = 0; i < arg->count_objs; i++) {
+		uint32_t obj_id, count_props;
+		struct drm_mode_object *obj;
+
+		if (get_user(obj_id, objs_ptr + copied_objs)) {
+			ret = -EFAULT;
+			goto out;
+		}
+
+		obj = drm_mode_object_find(dev, obj_id, DRM_MODE_OBJECT_ANY);
+		if (!obj || !obj->properties) {
+			ret = -ENOENT;
+			goto out;
+		}
+
+		if ((obj->type == DRM_MODE_OBJECT_CRTC) &&
+				(arg->flags & DRM_MODE_PAGE_FLIP_EVENT)) {
+			struct drm_pending_vblank_event *e =
+				create_vblank_event(dev, file_priv, arg->user_data);
+			if (!e) {
+				ret = -ENOMEM;
+				goto out;
+			}
+			ret = dev->driver->atomic_set_event(dev, state, obj, e);
+			if (ret) {
+				destroy_vblank_event(dev, file_priv, e);
+				goto out;
+			}
+		}
+
+		if (get_user(count_props, count_props_ptr + copied_objs)) {
+			ret = -EFAULT;
+			goto out;
+		}
+
+		copied_objs++;
+
+		for (j = 0; j < count_props; j++) {
+			uint32_t prop_id;
+			uint64_t prop_value;
+			struct drm_property *prop;
+			void *blob_data = NULL;
+
+			if (get_user(prop_id, props_ptr + copied_props)) {
+				ret = -EFAULT;
+				goto out;
+			}
+
+			if (!object_has_prop(obj, prop_id)) {
+				ret = -EINVAL;
+				goto out;
+			}
+
+			prop = drm_property_find(dev, prop_id);
+			if (!prop) {
+				ret = -ENOENT;
+				goto out;
+			}
+
+			if (get_user(prop_value, prop_values_ptr + copied_props)) {
+				ret = -EFAULT;
+				goto out;
+			}
+
+			if (!drm_property_change_is_valid(prop, prop_value)) {
+				ret = -EINVAL;
+				goto out;
+			}
+
+			if ((prop->flags & DRM_MODE_PROP_BLOB) && prop_value) {
+				uint64_t blob_ptr;
+
+				if (get_user(blob_ptr, blob_values_ptr + copied_blobs)) {
+					ret = -EFAULT;
+					goto out;
+				}
+
+				blob_data = kmalloc(prop_value, GFP_KERNEL);
+				if (!blob_data) {
+					ret = -ENOMEM;
+					goto out;
+				}
+
+				if (copy_from_user(blob_data, (void __user *)(unsigned long)blob_ptr, prop_value)) {
+					kfree(blob_data);
+					ret = -EFAULT;
+					goto out;
+				}
+			}
+
+			/* User space sends the blob pointer even if we
+			 * don't use it (length==0).
+			 */
+			if (prop->flags & DRM_MODE_PROP_BLOB)
+				copied_blobs++;
+
+			/* The driver will be in charge of blob_data from now on. */
+			ret = drm_mode_set_obj_prop(obj, state, prop,
+					prop_value, blob_data);
+			if (ret)
+				goto out;
+
+			copied_props++;
+		}
+	}
+
+	ret = dev->driver->atomic_check(dev, state);
+	if (ret)
+		goto out;
+
+	if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
+		goto out;
+
+	ret = dev->driver->atomic_commit(dev, state);
+
+ out:
+	dev->driver->atomic_end(dev, state);
+	if (ret == -EDEADLK)
+		goto retry;
+
+	return ret;
+}
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 345be03..8703651 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -167,6 +167,7 @@  static const struct drm_ioctl_desc drm_ioctls[] = {
 	DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 	DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 	DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
+	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 };
 
 #define DRM_CORE_IOCTL_COUNT	ARRAY_SIZE( drm_ioctls )
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 2f72875..0bf4e67 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1171,6 +1171,12 @@  struct drm_vblank_crtc {
 					   once per disable */
 };
 
+struct drm_pending_atomic_event {
+	struct drm_pending_event base;
+	int pipe;
+	struct drm_event_atomic event;
+};
+
 /**
  * DRM device structure. This structure represent a complete card that
  * may contain multiple heads.
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 88d8117..ba34c70 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1517,6 +1517,8 @@  extern int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
 					     struct drm_file *file_priv);
 extern int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
 					   struct drm_file *file_priv);
+extern int drm_mode_atomic_ioctl(struct drm_device *dev,
+				 void *data, struct drm_file *file_priv);
 
 extern void drm_fb_get_bpp_depth(uint32_t format, unsigned int *depth,
 				 int *bpp);
diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index 6e4952b..eabc071 100644
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -768,6 +768,7 @@  struct drm_prime_handle {
 #define DRM_IOCTL_MODE_OBJ_GETPROPERTIES	DRM_IOWR(0xB9, struct drm_mode_obj_get_properties)
 #define DRM_IOCTL_MODE_OBJ_SETPROPERTY	DRM_IOWR(0xBA, struct drm_mode_obj_set_property)
 #define DRM_IOCTL_MODE_CURSOR2		DRM_IOWR(0xBB, struct drm_mode_cursor2)
+#define DRM_IOCTL_MODE_ATOMIC		DRM_IOWR(0xBC, struct drm_mode_atomic)
 
 /**
  * Device specific ioctls should only be in their respective headers
@@ -809,6 +810,17 @@  struct drm_event_vblank {
 	__u32 reserved;
 };
 
+struct drm_event_atomic {
+	struct drm_event base;
+	__u64 user_data;
+	__u32 tv_sec;
+	__u32 tv_usec;
+	__u32 sequence;
+	__u32 obj_id;
+	__u32 old_fb_id;
+	__u32 reserved;
+};
+
 /* typedef area */
 #ifndef __KERNEL__
 typedef struct drm_clip_rect drm_clip_rect_t;
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 6421edc..a4b2e58 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -511,7 +511,27 @@  struct drm_mode_destroy_dumb {
 	uint32_t handle;
 };
 
+/* page-flip flags are valid, plus: */
+#define DRM_MODE_ATOMIC_TEST_ONLY 0x0100
 #define DRM_MODE_ATOMIC_NONBLOCK  0x0200
 #define DRM_MODE_ATOMIC_NOLOCK    0x8000  /* only used internally */
 
+#define DRM_MODE_ATOMIC_FLAGS (\
+		DRM_MODE_PAGE_FLIP_EVENT |\
+		DRM_MODE_PAGE_FLIP_ASYNC |\
+		DRM_MODE_ATOMIC_TEST_ONLY |\
+		DRM_MODE_ATOMIC_NONBLOCK)
+
+/* FIXME come up with some sane error reporting mechanism? */
+struct drm_mode_atomic {
+	__u32 flags;
+	__u32 count_objs;
+	__u64 objs_ptr;
+	__u64 count_props_ptr;
+	__u64 props_ptr;
+	__u64 prop_values_ptr;
+	__u64 blob_values_ptr;
+	__u64 user_data;
+};
+
 #endif