[RFC][PATCH 5/6] WIP: drm: Atomic modeset ioctl
ville.syrjala at linux.intel.com
ville.syrjala at linux.intel.com
Thu May 24 13:16:46 PDT 2012
From: Ville Syrjälä <ville.syrjala at linux.intel.com>
First draft.
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.
Detailed error reporting is missing, as is completion event support.
---
drivers/gpu/drm/drm_crtc.c | 133 ++++++++++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/drm_drv.c | 1 +
include/drm/drm.h | 1 +
include/drm/drmP.h | 2 +
include/drm/drm_crtc.h | 12 ++++
include/drm/drm_mode.h | 14 +++++
6 files changed, 163 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 958a4b0..0dc94c5 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -4124,3 +4124,136 @@ int drm_calc_vscale(struct drm_region *src, struct drm_region *dst,
return vscale;
}
EXPORT_SYMBOL(drm_calc_vscale);
+
+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 = 0;
+ unsigned int copied_props = 0;
+ unsigned int copied_blobs = 0;
+ void *state;
+ int ret = 0;
+ unsigned int i, j;
+
+ if (!dev->driver->atomic_funcs ||
+ !dev->driver->atomic_funcs->begin ||
+ !dev->driver->atomic_funcs->set ||
+ !dev->driver->atomic_funcs->check ||
+ !dev->driver->atomic_funcs->commit ||
+ !dev->driver->atomic_funcs->end)
+ return -ENOSYS;
+
+ if (arg->flags & ~DRM_ATOMIC_TEST_ONLY)
+ return -EINVAL;
+
+ mutex_lock(&dev->mode_config.mutex);
+
+ state = dev->driver->atomic_funcs->begin(dev, arg->flags);
+ if (IS_ERR(state)) {
+ ret = PTR_ERR(state);
+ goto unlock;
+ }
+
+ 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 (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_mode_object *prop_obj;
+ 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_obj = drm_mode_object_find(dev, prop_id, DRM_MODE_OBJECT_PROPERTY);
+ if (!prop_obj) {
+ ret = -ENOENT;
+ goto out;
+ }
+ prop = obj_to_property(prop_obj);
+
+ 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) {
+ blob_data = kmalloc(prop_value, GFP_KERNEL);
+ if (!blob_data) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ if (copy_from_user(blob_data, blob_values_ptr + copied_blobs, prop_value)) {
+ kfree(blob_data);
+ ret = -EFAULT;
+ goto out;
+ }
+
+ copied_blobs++;
+ }
+
+ /* The driver will be in charge of blob_data from now on. */
+ ret = dev->driver->atomic_funcs->set(dev, state, obj, prop, prop_value, blob_data);
+ if (ret)
+ goto out;
+
+ copied_props++;
+ }
+ }
+
+ ret = dev->driver->atomic_funcs->check(dev, state);
+ if (ret)
+ goto out;
+
+ if (arg->flags & DRM_ATOMIC_TEST_ONLY)
+ goto out;
+
+ ret = dev->driver->atomic_funcs->commit(dev, state);
+
+ out:
+ dev->driver->atomic_funcs->end(dev, state);
+ unlock:
+ 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 8a9d079..3e32c8a 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -166,6 +166,7 @@ static struct drm_ioctl_desc drm_ioctls[] = {
DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_MASTER|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_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/drm.h b/include/drm/drm.h
index e51035a..b179169 100644
--- a/include/drm/drm.h
+++ b/include/drm/drm.h
@@ -732,6 +732,7 @@ struct drm_prime_handle {
#define DRM_IOCTL_MODE_ADDFB2 DRM_IOWR(0xB8, struct drm_mode_fb_cmd2)
#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_ATOMIC DRM_IOWR(0xBB, struct drm_mode_atomic)
/**
* Device specific ioctls should only be in their respective headers
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 31ad880..7bff96d 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -964,6 +964,8 @@ struct drm_driver {
/* List of devices hanging off this driver */
struct list_head device_list;
+
+ const struct drm_atomic_funcs *atomic_funcs;
};
#define DRM_MINOR_UNASSIGNED 0
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 8b1f173..b3d6545 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1063,6 +1063,8 @@ 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);
@@ -1099,4 +1101,14 @@ extern int drm_calc_hscale(struct drm_region *src, struct drm_region *dst,
extern int drm_calc_vscale(struct drm_region *src, struct drm_region *dst,
int min_vscale, int max_vscale);
+struct drm_atomic_funcs {
+ void *(*begin)(struct drm_device *dev, uint32_t flags);
+ int (*set)(struct drm_device *dev, void *state,
+ struct drm_mode_object *obj, struct drm_property *prop,
+ uint64_t value, void *blob_data);
+ int (*check)(struct drm_device *dev, void *state);
+ int (*commit)(struct drm_device *dev, void *state);
+ void (*end)(struct drm_device *dev, void *state);
+};
+
#endif /* __DRM_CRTC_H__ */
diff --git a/include/drm/drm_mode.h b/include/drm/drm_mode.h
index 5581980..ed776b4 100644
--- a/include/drm/drm_mode.h
+++ b/include/drm/drm_mode.h
@@ -459,4 +459,18 @@ struct drm_mode_destroy_dumb {
uint32_t handle;
};
+
+#define DRM_ATOMIC_TEST_ONLY (1<<0)
+
+/* 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;
+};
+
#endif
--
1.7.3.4
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