[RFCv1 11/12] drm: Atomic modeset ioctl
Ville Syrjälä
ville.syrjala at linux.intel.com
Mon Oct 7 16:18:02 CEST 2013
On Mon, Oct 07, 2013 at 09:55:47AM -0400, Rob Clark wrote:
> On Mon, Oct 7, 2013 at 9:28 AM, Ville Syrjälä
> <ville.syrjala at linux.intel.com> wrote:
> > On Sat, Oct 05, 2013 at 08:45:49PM -0400, Rob Clark wrote:
> >> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> >>
> >> 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.
> >>
> >> TODO: detailed error reporting?
> >>
> >> v1: original
> >> v2: rebase on uapi changes, and drm state structs.. -- Rob Clark
> >> v3: rebase, missing padding in drm_event_atomic.. -- Rob Clark
> >>
> >> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> >> ---
> >> drivers/gpu/drm/drm_crtc.c | 159 ++++++++++++++++++++++++++++++++++++++++++++
> >> 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 | 16 +++++
> >> 6 files changed, 196 insertions(+)
> >>
> >> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> >> index 09396a9..910e5c6 100644
> >> --- a/drivers/gpu/drm/drm_crtc.c
> >> +++ b/drivers/gpu/drm/drm_crtc.c
> >> @@ -4338,3 +4338,162 @@ 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 = 0;
> >> + unsigned int copied_props = 0;
> >> + unsigned int copied_blobs = 0;
> >> + void *state;
> >> + int ret = 0;
> >> + unsigned int i, j;
> >> +
> >> + if (arg->flags & ~(DRM_MODE_ATOMIC_TEST_ONLY |
> >> + DRM_MODE_ATOMIC_EVENT | DRM_MODE_ATOMIC_NONBLOCK))
> >> + 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_ATOMIC_EVENT))
> >> + return -EINVAL;
> >> +
> >> + mutex_lock(&dev->mode_config.mutex);
> >
> > I'm pretty sure I had a version w/ fixed locking...
> >
> > git://gitorious.org/vsyrjala/linux.git rebased_drm_atomic_24
>
> oh, hmm.. actually the locking should no longer be in the ioctl fxn,
> but should be pushed down to the commit. looks like I missed this. I
> need to dig up some actual test code for atomic ioctl ;-)
It can't be in commit. At the very least it has to be around
check+commit, and also you need to hold some locks when you're copying
the current config over to your temp storage. That's assuming you store
_everything_ in the temp storage and so it doesn't matter if the current
state can change between the copy and check+commit.
>
> >> +
> >> + state = dev->driver->atomic_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 (arg->flags & DRM_MODE_ATOMIC_EVENT) {
> >> + // XXX create atomic event instead..
> >
> > Some people are apparently more comfortable with a per-crtc event
> > rather than the per-obj events I added. So I think we might want
> > both in the end.
>
> yeah, sorting out events is a bit 'TODO' at the moment. I do kind of
> like per-crtc event.. it seems easier to implement and I'm not really
> sure what finer event granularity buys us.
Mainly it gets you the old fb. If you limit youself to < vrefresh it's
not a big deal, but going faster than that and you start to want that
information.
>
> BR,
> -R
>
>> + 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_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) {
> >> + 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);
> >> + 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 e572dd2..43e04ae 100644
> >> --- a/drivers/gpu/drm/drm_drv.c
> >> +++ b/drivers/gpu/drm/drm_drv.c
> >> @@ -166,6 +166,7 @@ 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 4c3de22..f282733 100644
> >> --- a/include/drm/drmP.h
> >> +++ b/include/drm/drmP.h
> >> @@ -1158,6 +1158,12 @@ struct drm_pending_vblank_event {
> >> struct drm_event_vblank event;
> >> };
> >>
> >> +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 86a5a00..fa3956e 100644
> >> --- a/include/drm/drm_crtc.h
> >> +++ b/include/drm/drm_crtc.h
> >> @@ -1313,6 +1313,8 @@ 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 ece8678..efb1461 100644
> >> --- a/include/uapi/drm/drm.h
> >> +++ b/include/uapi/drm/drm.h
> >> @@ -733,6 +733,7 @@ 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
> >> @@ -774,6 +775,17 @@ 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;
> >> +};
> >> +
> >> #define DRM_CAP_DUMB_BUFFER 0x1
> >> #define DRM_CAP_VBLANK_HIGH_CRTC 0x2
> >> #define DRM_CAP_DUMB_PREFERRED_DEPTH 0x3
> >> diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
> >> index 6d4f089..03a473c 100644
> >> --- a/include/uapi/drm/drm_mode.h
> >> +++ b/include/uapi/drm/drm_mode.h
> >> @@ -489,4 +489,20 @@ struct drm_mode_destroy_dumb {
> >> uint32_t handle;
> >> };
> >>
> >> +#define DRM_MODE_ATOMIC_TEST_ONLY (1<<0)
> >> +#define DRM_MODE_ATOMIC_EVENT (1<<1)
> >> +#define DRM_MODE_ATOMIC_NONBLOCK (1<<2)
> >> +
> >> +/* 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
> >> --
> >> 1.8.3.1
> >
> > --
> > Ville Syrjälä
> > Intel OTC
--
Ville Syrjälä
Intel OTC
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