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drm-backend: add support for writeback connectors

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Recognize writeback connectors and add 'struct drm_writeback'
objects in order to store them.

These objects are created and stored in a list by the time
that DRM-backend is initialized. This list is updated if a
writeback connector dynamically appears or is disconnected.

Signed-off-by: Leandro Ribeiro <leandro.ribeiro@collabora.com>
dev
Leandro Ribeiro 4 years ago committed by Pekka Paalanen
parent 7243022b38
commit 96bef0517e
3 changed files with 149 additions and 11 deletions
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  1. 11
      libweston/backend-drm/drm-internal.h
  2. 139
      libweston/backend-drm/drm.c
  3. 2
      libweston/backend-drm/kms.c

11
libweston/backend-drm/drm-internal.h
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@ -278,6 +278,9 @@ struct drm_backend {
/* drm_crtc::link */
struct wl_list crtc_list;
/* drm_writeback::link */
struct wl_list writeback_connector_list;
bool sprites_are_broken;
bool cursors_are_broken;
@ -478,6 +481,14 @@ struct drm_connector {
struct drm_property_info props[WDRM_CONNECTOR__COUNT];
};
struct drm_writeback {
/* drm_backend::writeback_connector_list */
struct wl_list link;
struct drm_backend *backend;
struct drm_connector connector;
};
struct drm_head {
struct weston_head base;
struct drm_backend *backend;

139
libweston/backend-drm/drm.c
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@ -220,6 +220,19 @@ drm_head_find_by_connector(struct drm_backend *backend, uint32_t connector_id)
return NULL;
}
static struct drm_writeback *
drm_writeback_find_by_connector(struct drm_backend *backend, uint32_t connector_id)
{
struct drm_writeback *writeback;
wl_list_for_each(writeback, &backend->writeback_connector_list, link) {
if (writeback->connector.connector_id == connector_id)
return writeback;
}
return NULL;
}
/**
* Get output state to disable output
*
@ -2101,6 +2114,24 @@ drm_head_update_info(struct drm_head *head, drmModeConnector *conn)
return ret;
}
/** Update writeback connector
*
* @param writeback The writeback to update.
* @param conn DRM connector object.
* @returns 0 on success, -1 on failure.
*
* Takes ownership of @c connector on success, not on failure.
*/
static int
drm_writeback_update_info(struct drm_writeback *writeback, drmModeConnector *conn)
{
int ret;
ret = drm_connector_assign_connector_info(&writeback->connector, conn);
return ret;
}
/**
* Create a Weston head for a connector
*
@ -2227,9 +2258,57 @@ drm_output_create(struct weston_compositor *compositor, const char *name)
return &output->base;
}
/** Given the DRM connector object of a connector, create drm_head for it.
/**
* Create a Weston writeback for a writeback connector
*
* The object is then added to the DRM-backend list of heads.
* Given a DRM connector of type writeback, create a matching drm_writeback
* structure and add it to Weston's writeback list.
*
* @param b Weston backend structure
* @param conn DRM connector object of type writeback
* @returns 0 on success, -1 on failure
*
* Takes ownership of @c connector on success, not on failure.
*/
static int
drm_writeback_create(struct drm_backend *b, drmModeConnector *conn)
{
struct drm_writeback *writeback;
int ret;
writeback = zalloc(sizeof *writeback);
assert(writeback);
writeback->backend = b;
drm_connector_init(b, &writeback->connector, conn->connector_id);
ret = drm_writeback_update_info(writeback, conn);
if (ret < 0)
goto err;
wl_list_insert(&b->writeback_connector_list, &writeback->link);
return 0;
err:
drm_connector_fini(&writeback->connector);
free(writeback);
return -1;
}
static void
drm_writeback_destroy(struct drm_writeback *writeback)
{
drm_connector_fini(&writeback->connector);
wl_list_remove(&writeback->link);
free(writeback);
}
/** Given the DRM connector object of a connector, create drm_head or
* drm_writeback object (depending on the type of connector) for it.
*
* The object is then added to the DRM-backend list of heads or writebacks.
*
* @param b The DRM-backend structure
* @param conn The DRM connector object
@ -2242,16 +2321,32 @@ drm_backend_add_connector(struct drm_backend *b, drmModeConnector *conn,
{
int ret;
if (conn->connector_type == DRM_MODE_CONNECTOR_WRITEBACK) {
ret = drm_writeback_create(b, conn);
if (ret < 0)
weston_log("DRM: failed to create writeback for connector %d.\n",
conn->connector_id);
} else {
ret = drm_head_create(b, conn, drm_device);
if (ret < 0)
weston_log("DRM: failed to create head for connector %d.\n",
conn->connector_id);
}
return ret;
}
/** Find all connectors of the fd and create drm_head or drm_writeback objects
* (depending on the type of connector they are) for each of them
*
* These objects are added to the DRM-backend lists of heads and writebacks.
*
* @param b The DRM-backend structure
* @param drm_device udev device pointer
* @return 0 on success, -1 on failure
*/
static int
drm_backend_create_heads(struct drm_backend *b, struct udev_device *drm_device)
drm_backend_discover_connectors(struct drm_backend *b, struct udev_device *drm_device)
{
drmModeRes *resources;
drmModeConnector *conn;
@ -2301,8 +2396,9 @@ drm_backend_update_connectors(struct drm_backend *b, struct udev_device *drm_dev
{
drmModeRes *resources;
drmModeConnector *conn;
struct weston_head *base, *next;
struct weston_head *base, *base_next;
struct drm_head *head;
struct drm_writeback *writeback, *writeback_next;
uint32_t connector_id;
int i, ret;
@ -2321,8 +2417,16 @@ drm_backend_update_connectors(struct drm_backend *b, struct udev_device *drm_dev
continue;
head = drm_head_find_by_connector(b, connector_id);
writeback = drm_writeback_find_by_connector(b, connector_id);
/* Connector can't be owned by both a head and a writeback, so
* one of the searches must fail. */
assert(head == NULL || writeback == NULL);
if (head)
ret = drm_head_update_info(head, conn);
else if (writeback)
ret = drm_writeback_update_info(writeback, conn);
else
ret = drm_backend_add_connector(b, conn, drm_device);
@ -2330,8 +2434,9 @@ drm_backend_update_connectors(struct drm_backend *b, struct udev_device *drm_dev
drmModeFreeConnector(conn);
}
/* Remove connectors that have disappeared. */
wl_list_for_each_safe(base, next,
/* Destroy head objects of connectors (except writeback connectors) that
* have disappeared. */
wl_list_for_each_safe(base, base_next,
&b->compositor->head_list, compositor_link) {
head = to_drm_head(base);
connector_id = head->connector.connector_id;
@ -2344,6 +2449,20 @@ drm_backend_update_connectors(struct drm_backend *b, struct udev_device *drm_dev
drm_head_destroy(head);
}
/* Destroy writeback objects of writeback connectors that have
* disappeared. */
wl_list_for_each_safe(writeback, writeback_next,
&b->writeback_connector_list, link) {
connector_id = writeback->connector.connector_id;
if (resources_has_connector(resources, connector_id))
continue;
weston_log("DRM: writeback connector (connector %d) disappeared.\n",
connector_id);
drm_writeback_destroy(writeback);
}
drmModeFreeResources(resources);
}
@ -2462,6 +2581,7 @@ drm_destroy(struct weston_compositor *ec)
struct drm_backend *b = to_drm_backend(ec);
struct weston_head *base, *next;
struct drm_crtc *crtc, *crtc_tmp;
struct drm_writeback *writeback, *writeback_tmp;
udev_input_destroy(&b->input);
@ -2482,6 +2602,10 @@ drm_destroy(struct weston_compositor *ec)
wl_list_for_each_safe(base, next, &ec->head_list, compositor_link)
drm_head_destroy(to_drm_head(base));
wl_list_for_each_safe(writeback, writeback_tmp,
&b->writeback_connector_list, link)
drm_writeback_destroy(writeback);
#ifdef BUILD_DRM_GBM
if (b->gbm)
gbm_device_destroy(b->gbm);
@ -2991,7 +3115,8 @@ drm_backend_create(struct weston_compositor *compositor,
goto err_sprite;
}
if (drm_backend_create_heads(b, drm_device) < 0) {
wl_list_init(&b->writeback_connector_list);
if (drm_backend_discover_connectors(b, drm_device) < 0) {
weston_log("Failed to create heads for %s\n", b->drm.filename);
goto err_udev_input;
}

2
libweston/backend-drm/kms.c
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@ -1487,6 +1487,8 @@ init_kms_caps(struct drm_backend *b)
weston_log("DRM: %s GBM modifiers\n",
b->fb_modifiers ? "supports" : "does not support");
drmSetClientCap(b->drm.fd, DRM_CLIENT_CAP_WRITEBACK_CONNECTORS, 1);
/*
* KMS support for hardware planes cannot properly synchronize
* without nuclear page flip. Without nuclear/atomic, hw plane

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