Hi
On Mon, Oct 20, 2014 at 8:37 AM, Dave Airlie <airlied@xxxxxxxxx> wrote:
> From: Dave Airlie <airlied@xxxxxxxxxx>
>
> A tile group is an identifier shared by a single monitor,
> DisplayID topology has 8 bytes we can use for this, just
> use those for now until something else comes up in the
> future. We assign these to an idr and use the idr to
> tell userspace what connectors are in the same tile group.
>
> DisplayID v1.3 says the serial number must be unique for
> displays from the same manufacturer.
>
> Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
> ---
> drivers/gpu/drm/drm_crtc.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++
> include/drm/drm_crtc.h | 16 ++++++++++++
> 2 files changed, 77 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index 90e7730..dfccc34 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -5037,6 +5037,7 @@ void drm_mode_config_init(struct drm_device *dev)
> INIT_LIST_HEAD(&dev->mode_config.property_blob_list);
> INIT_LIST_HEAD(&dev->mode_config.plane_list);
> idr_init(&dev->mode_config.crtc_idr);
> + idr_init(&dev->mode_config.tile_idr);
You are missing a call to idr_destroy() in drm_mode_config_cleanup().
The IDR caches are not cleaned up automatically when it drops to size
0...
Thanks
David
>
> drm_modeset_lock_all(dev);
> drm_mode_create_standard_connector_properties(dev);
> @@ -5146,3 +5147,63 @@ struct drm_property *drm_mode_create_rotation_property(struct drm_device *dev,
> supported_rotations);
> }
> EXPORT_SYMBOL(drm_mode_create_rotation_property);
> +
> +static void drm_tile_group_free(struct kref *kref)
> +{
> + struct drm_tile_group *tg = container_of(kref, struct drm_tile_group, refcount);
> + struct drm_device *dev = tg->dev;
> + mutex_lock(&dev->mode_config.idr_mutex);
> + idr_remove(&dev->mode_config.tile_idr, tg->id);
> + mutex_lock(&dev->mode_config.idr_mutex);
> + kfree(tg);
> +}
> +
> +void drm_mode_put_tile_group(struct drm_device *dev,
> + struct drm_tile_group *tg)
> +{
> + kref_put(&tg->refcount, drm_tile_group_free);
> +}
> +
> +struct drm_tile_group *drm_mode_get_tile_group(struct drm_device *dev,
> + char topology[8])
> +{
> + struct drm_tile_group *tg;
> + int id;
> + mutex_lock(&dev->mode_config.idr_mutex);
> + idr_for_each_entry(&dev->mode_config.tile_idr, tg, id) {
> + if (!memcmp(tg->group_data, topology, 8)) {
> + kref_get(&tg->refcount);
> + mutex_unlock(&dev->mode_config.idr_mutex);
> + return tg;
> + }
> + }
> + mutex_unlock(&dev->mode_config.idr_mutex);
> + return NULL;
> +}
> +
> +struct drm_tile_group *drm_mode_create_tile_group(struct drm_device *dev,
> + char topology[8])
> +{
> + struct drm_tile_group *tg;
> + int ret;
> +
> + tg = kzalloc(sizeof(*tg), GFP_KERNEL);
> + if (!tg)
> + return ERR_PTR(-ENOMEM);
> +
> + kref_init(&tg->refcount);
> + memcpy(tg->group_data, topology, 8);
> + tg->dev = dev;
> +
> + mutex_lock(&dev->mode_config.idr_mutex);
> + ret = idr_alloc(&dev->mode_config.tile_idr, tg, 1, 0, GFP_KERNEL);
> + if (ret >= 0) {
> + tg->id = ret;
> + } else {
> + kfree(tg);
> + tg = NULL;
> + }
> +
> + mutex_unlock(&dev->mode_config.idr_mutex);
> + return tg;
> +}
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index f1105d0..afaec4b 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -136,6 +136,14 @@ struct drm_display_info {
> u8 cea_rev;
> };
>
> +/* data corresponds to displayid vend/prod/serial */
> +struct drm_tile_group {
> + struct kref refcount;
> + struct drm_device *dev;
> + int id;
> + u8 group_data[8];
> +};
> +
> struct drm_framebuffer_funcs {
> /* note: use drm_framebuffer_remove() */
> void (*destroy)(struct drm_framebuffer *framebuffer);
> @@ -770,6 +778,7 @@ struct drm_mode_config {
> struct drm_modeset_acquire_ctx *acquire_ctx; /* for legacy _lock_all() / _unlock_all() */
> struct mutex idr_mutex; /* for IDR management */
> struct idr crtc_idr; /* use this idr for all IDs, fb, crtc, connector, modes - just makes life easier */
> + struct idr tile_idr; /* use this idr for all IDs, fb, crtc, connector, modes - just makes life easier */
> /* this is limited to one for now */
>
>
> @@ -1106,6 +1115,13 @@ extern void drm_set_preferred_mode(struct drm_connector *connector,
> extern int drm_edid_header_is_valid(const u8 *raw_edid);
> extern bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid);
> extern bool drm_edid_is_valid(struct edid *edid);
> +
> +extern struct drm_tile_group *drm_mode_create_tile_group(struct drm_device *dev,
> + char topology[8]);
> +extern struct drm_tile_group *drm_mode_get_tile_group(struct drm_device *dev,
> + char topology[8]);
> +extern void drm_mode_put_tile_group(struct drm_device *dev,
> + struct drm_tile_group *tg);
> struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
> int hsize, int vsize, int fresh,
> bool rb);
> --
> 2.1.0
>
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