/* * Copyright (c) 2006-2008 Intel Corporation * Copyright (c) 2007 Dave Airlie <airlied@linux.ie> * Copyright (c) 2008 Red Hat Inc. * * DRM core CRTC related functions * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that copyright * notice and this permission notice appear in supporting documentation, and * that the name of the copyright holders not be used in advertising or * publicity pertaining to distribution of the software without specific, * written prior permission. The copyright holders make no representations * about the suitability of this software for any purpose. It is provided "as * is" without express or implied warranty. * * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE * OF THIS SOFTWARE. * * Authors: * Keith Packard * Eric Anholt <eric@anholt.net> * Dave Airlie <airlied@linux.ie> * Jesse Barnes <jesse.barnes@intel.com>
*/ #include <linux/ctype.h> #include <linux/list.h> #include <linux/slab.h> #include <linux/export.h> #include <linux/dma-fence.h> #include <linux/uaccess.h> #include <drm/drm_blend.h> #include <drm/drm_crtc.h> #include <drm/drm_edid.h> #include <drm/drm_fourcc.h> #include <drm/drm_framebuffer.h> #include <drm/drm_managed.h> #include <drm/drm_modeset_lock.h> #include <drm/drm_atomic.h> #include <drm/drm_auth.h> #include <drm/drm_debugfs_crc.h> #include <drm/drm_drv.h> #include <drm/drm_print.h> #include <drm/drm_file.h>
/** * DOC: overview * * A CRTC represents the overall display pipeline. It receives pixel data from * &drm_plane and blends them together. The &drm_display_mode is also attached * to the CRTC, specifying display timings. On the output side the data is fed * to one or more &drm_encoder, which are then each connected to one * &drm_connector. * * To create a CRTC, a KMS driver allocates and zeroes an instance of * &struct drm_crtc (possibly as part of a larger structure) and registers it * with a call to drm_crtc_init_with_planes(). * * The CRTC is also the entry point for legacy modeset operations (see * &drm_crtc_funcs.set_config), legacy plane operations (see * &drm_crtc_funcs.page_flip and &drm_crtc_funcs.cursor_set2), and other legacy * operations like &drm_crtc_funcs.gamma_set. For atomic drivers all these * features are controlled through &drm_property and * &drm_mode_config_funcs.atomic_check.
*/
/** * drm_crtc_from_index - find the registered CRTC at an index * @dev: DRM device * @idx: index of registered CRTC to find for * * Given a CRTC index, return the registered CRTC from DRM device's * list of CRTCs with matching index. This is the inverse of drm_crtc_index(). * It's useful in the vblank callbacks (like &drm_driver.enable_vblank or * &drm_driver.disable_vblank), since that still deals with indices instead * of pointers to &struct drm_crtc."
*/ struct drm_crtc *drm_crtc_from_index(struct drm_device *dev, int idx)
{ struct drm_crtc *crtc;
drm_for_each_crtc(crtc, dev) if (idx == crtc->index) return crtc;
/** * DOC: standard CRTC properties * * DRM CRTCs have a few standardized properties: * * ACTIVE: * Atomic property for setting the power state of the CRTC. When set to 1 * the CRTC will actively display content. When set to 0 the CRTC will be * powered off. There is no expectation that user-space will reset CRTC * resources like the mode and planes when setting ACTIVE to 0. * * User-space can rely on an ACTIVE change to 1 to never fail an atomic * test as long as no other property has changed. If a change to ACTIVE * fails an atomic test, this is a driver bug. For this reason setting * ACTIVE to 0 must not release internal resources (like reserved memory * bandwidth or clock generators). * * Note that the legacy DPMS property on connectors is internally routed * to control this property for atomic drivers. * MODE_ID: * Atomic property for setting the CRTC display timings. The value is the * ID of a blob containing the DRM mode info. To disable the CRTC, * user-space must set this property to 0. * * Setting MODE_ID to 0 will release reserved resources for the CRTC. * SCALING_FILTER: * Atomic property for setting the scaling filter for CRTC scaler * * The value of this property can be one of the following: * * Default: * Driver's default scaling filter * Nearest Neighbor: * Nearest Neighbor scaling filter
*/
/** * drm_crtc_init_with_planes - Initialise a new CRTC object with * specified primary and cursor planes. * @dev: DRM device * @crtc: CRTC object to init * @primary: Primary plane for CRTC * @cursor: Cursor plane for CRTC * @funcs: callbacks for the new CRTC * @name: printf style format string for the CRTC name, or NULL for default name * * Inits a new object created as base part of a driver crtc object. Drivers * should use this function instead of drm_crtc_init(), which is only provided * for backwards compatibility with drivers which do not yet support universal * planes). For really simple hardware which has only 1 plane look at * drm_simple_display_pipe_init() instead. * The &drm_crtc_funcs.destroy hook should call drm_crtc_cleanup() and kfree() * the crtc structure. The crtc structure should not be allocated with * devm_kzalloc(). * * The @primary and @cursor planes are only relevant for legacy uAPI, see * &drm_crtc.primary and &drm_crtc.cursor. * * Note: consider using drmm_crtc_alloc_with_planes() or * drmm_crtc_init_with_planes() instead of drm_crtc_init_with_planes() * to let the DRM managed resource infrastructure take care of cleanup * and deallocation. * * Returns: * Zero on success, error code on failure.
*/ int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc, struct drm_plane *primary, struct drm_plane *cursor, conststruct drm_crtc_funcs *funcs, constchar *name, ...)
{
va_list ap; int ret;
ret = __drm_crtc_init_with_planes(dev, crtc, primary, cursor, funcs,
name, args); if (ret) return ret;
ret = drmm_add_action_or_reset(dev, drmm_crtc_init_with_planes_cleanup,
crtc); if (ret) return ret;
return 0;
}
/** * drmm_crtc_init_with_planes - Initialise a new CRTC object with * specified primary and cursor planes. * @dev: DRM device * @crtc: CRTC object to init * @primary: Primary plane for CRTC * @cursor: Cursor plane for CRTC * @funcs: callbacks for the new CRTC * @name: printf style format string for the CRTC name, or NULL for default name * * Inits a new object created as base part of a driver crtc object. Drivers * should use this function instead of drm_crtc_init(), which is only provided * for backwards compatibility with drivers which do not yet support universal * planes). For really simple hardware which has only 1 plane look at * drm_simple_display_pipe_init() instead. * * Cleanup is automatically handled through registering * drmm_crtc_cleanup() with drmm_add_action(). The crtc structure should * be allocated with drmm_kzalloc(). * * The @drm_crtc_funcs.destroy hook must be NULL. * * The @primary and @cursor planes are only relevant for legacy uAPI, see * &drm_crtc.primary and &drm_crtc.cursor. * * Returns: * Zero on success, error code on failure.
*/ int drmm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc, struct drm_plane *primary, struct drm_plane *cursor, conststruct drm_crtc_funcs *funcs, constchar *name, ...)
{
va_list ap; int ret;
va_start(ap, name);
ret = __drmm_crtc_init_with_planes(dev, crtc, primary, cursor, funcs,
name, ap);
va_end(ap); if (ret) return ret;
/** * drm_crtc_cleanup - Clean up the core crtc usage * @crtc: CRTC to cleanup * * This function cleans up @crtc and removes it from the DRM mode setting * core. Note that the function does *not* free the crtc structure itself, * this is the responsibility of the caller.
*/ void drm_crtc_cleanup(struct drm_crtc *crtc)
{ struct drm_device *dev = crtc->dev;
/* Note that the crtc_list is considered to be static; should we * remove the drm_crtc at runtime we would have to decrement all * the indices on the drm_crtc after us in the crtc_list.
*/
/** * drm_mode_getcrtc - get CRTC configuration * @dev: drm device for the ioctl * @data: data pointer for the ioctl * @file_priv: drm file for the ioctl call * * Construct a CRTC configuration structure to return to the user. * * Called by the user via ioctl. * * Returns: * Zero on success, negative errno on failure.
*/ int drm_mode_getcrtc(struct drm_device *dev, void *data, struct drm_file *file_priv)
{ struct drm_mode_crtc *crtc_resp = data; struct drm_crtc *crtc; struct drm_plane *plane;
if (!drm_core_check_feature(dev, DRIVER_MODESET)) return -EOPNOTSUPP;
crtc = drm_crtc_find(dev, file_priv, crtc_resp->crtc_id); if (!crtc) return -ENOENT;
/* * NOTE: ->set_config can also disable other crtcs (if we steal all * connectors from it), hence we need to refcount the fbs across all * crtcs. Atomic modeset will have saner semantics ...
*/
drm_for_each_crtc(tmp, crtc->dev) { struct drm_plane *plane = tmp->primary;
plane->old_fb = plane->fb;
}
fb = set->fb;
ret = crtc->funcs->set_config(set, ctx); if (ret == 0) { struct drm_plane *plane = crtc->primary;
if (plane->fb)
drm_framebuffer_get(plane->fb); if (plane->old_fb)
drm_framebuffer_put(plane->old_fb);
plane->old_fb = NULL;
}
return ret;
}
/** * drm_mode_set_config_internal - helper to call &drm_mode_config_funcs.set_config * @set: modeset config to set * * This is a little helper to wrap internal calls to the * &drm_mode_config_funcs.set_config driver interface. The only thing it adds is * correct refcounting dance. * * This should only be used by non-atomic legacy drivers. * * Returns: * Zero on success, negative errno on failure.
*/ int drm_mode_set_config_internal(struct drm_mode_set *set)
{
WARN_ON(drm_drv_uses_atomic_modeset(set->crtc->dev));
/** * drm_crtc_check_viewport - Checks that a framebuffer is big enough for the * CRTC viewport * @crtc: CRTC that framebuffer will be displayed on * @x: x panning * @y: y panning * @mode: mode that framebuffer will be displayed under * @fb: framebuffer to check size of
*/ int drm_crtc_check_viewport(conststruct drm_crtc *crtc, int x, int y, conststruct drm_display_mode *mode, conststruct drm_framebuffer *fb)
/** * drm_mode_setcrtc - set CRTC configuration * @dev: drm device for the ioctl * @data: data pointer for the ioctl * @file_priv: drm file for the ioctl call * * Build a new CRTC configuration based on user request. * * Called by the user via ioctl. * * Returns: * Zero on success, negative errno on failure.
*/ int drm_mode_setcrtc(struct drm_device *dev, void *data, struct drm_file *file_priv)
{ struct drm_mode_config *config = &dev->mode_config; struct drm_mode_crtc *crtc_req = data; struct drm_crtc *crtc; struct drm_plane *plane; struct drm_connector **connector_set = NULL, *connector; struct drm_framebuffer *fb = NULL; struct drm_display_mode *mode = NULL; struct drm_mode_set set;
uint32_t __user *set_connectors_ptr; struct drm_modeset_acquire_ctx ctx; int ret, i, num_connectors = 0;
if (!drm_core_check_feature(dev, DRIVER_MODESET)) return -EOPNOTSUPP;
/* * Universal plane src offsets are only 16.16, prevent havoc for * drivers using universal plane code internally.
*/ if (crtc_req->x & 0xffff0000 || crtc_req->y & 0xffff0000) return -ERANGE;
if (crtc_req->mode_valid) { /* If we have a mode we need a framebuffer. */ /* If we pass -1, set the mode with the currently bound fb */ if (crtc_req->fb_id == -1) { struct drm_framebuffer *old_fb;
if (plane->state)
old_fb = plane->state->fb; else
old_fb = plane->fb;
if (!old_fb) {
drm_dbg_kms(dev, "CRTC doesn't have current FB\n");
ret = -EINVAL; goto out;
}
fb = old_fb; /* Make refcounting symmetric with the lookup path. */
drm_framebuffer_get(fb);
} else {
fb = drm_framebuffer_lookup(dev, file_priv, crtc_req->fb_id); if (!fb) {
drm_dbg_kms(dev, "Unknown FB ID%d\n",
crtc_req->fb_id);
ret = -ENOENT; goto out;
}
}
mode = drm_mode_create(dev); if (!mode) {
ret = -ENOMEM; goto out;
} if (!file_priv->aspect_ratio_allowed &&
(crtc_req->mode.flags & DRM_MODE_FLAG_PIC_AR_MASK) != DRM_MODE_FLAG_PIC_AR_NONE) {
drm_dbg_kms(dev, "Unexpected aspect-ratio flag bits\n");
ret = -EINVAL; goto out;
}
/* * Check whether the primary plane supports the fb pixel format. * Drivers not implementing the universal planes API use a * default formats list provided by the DRM core which doesn't * match real hardware capabilities. Skip the check in that * case.
*/ if (!plane->format_default) { if (!drm_plane_has_format(plane, fb->format->format, fb->modifier)) {
drm_dbg_kms(dev, "Invalid pixel format %p4cc, modifier 0x%llx\n",
&fb->format->format, fb->modifier);
ret = -EINVAL; goto out;
}
}
ret = drm_crtc_check_viewport(crtc, crtc_req->x, crtc_req->y,
mode, fb); if (ret) goto out;
}
if (crtc_req->count_connectors == 0 && mode) {
drm_dbg_kms(dev, "Count connectors is 0 but mode set\n");
ret = -EINVAL; goto out;
}
if (crtc_req->count_connectors > 0 && (!mode || !fb)) {
drm_dbg_kms(dev, "Count connectors is %d but no mode or fb set\n",
crtc_req->count_connectors);
ret = -EINVAL; goto out;
}
if (crtc_req->count_connectors > 0) {
u32 out_id;
/* Avoid unbounded kernel memory allocation */ if (crtc_req->count_connectors > config->num_connector) {
ret = -EINVAL; goto out;
}
connector_set = kmalloc_array(crtc_req->count_connectors, sizeof(struct drm_connector *),
GFP_KERNEL); if (!connector_set) {
ret = -ENOMEM; goto out;
}
for (i = 0; i < crtc_req->count_connectors; i++) {
connector_set[i] = NULL;
set_connectors_ptr = (uint32_t __user *)(unsignedlong)crtc_req->set_connectors_ptr; if (get_user(out_id, &set_connectors_ptr[i])) {
ret = -EFAULT; goto out;
}
connector = drm_connector_lookup(dev, file_priv, out_id); if (!connector) {
drm_dbg_kms(dev, "Connector id %d unknown\n",
out_id);
ret = -ENOENT; goto out;
}
drm_dbg_kms(dev, "[CONNECTOR:%d:%s]\n",
connector->base.id, connector->name);
if (drm_drv_uses_atomic_modeset(dev))
ret = crtc->funcs->set_config(&set, &ctx); else
ret = __drm_mode_set_config_internal(&set, &ctx);
out: if (fb)
drm_framebuffer_put(fb);
if (connector_set) { for (i = 0; i < num_connectors; i++) { if (connector_set[i])
drm_connector_put(connector_set[i]);
}
}
kfree(connector_set);
drm_mode_destroy(dev, mode);
/* In case we need to retry... */
connector_set = NULL;
fb = NULL;
mode = NULL;
num_connectors = 0;
DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
return ret;
}
int drm_mode_crtc_set_obj_prop(struct drm_mode_object *obj, struct drm_property *property,
uint64_t value)
{ int ret = -EINVAL; struct drm_crtc *crtc = obj_to_crtc(obj);
if (crtc->funcs->set_property)
ret = crtc->funcs->set_property(crtc, property, value); if (!ret)
drm_object_property_set_value(obj, property, value);
return ret;
}
/** * drm_crtc_create_scaling_filter_property - create a new scaling filter * property * * @crtc: drm CRTC * @supported_filters: bitmask of supported scaling filters, must include * BIT(DRM_SCALING_FILTER_DEFAULT). * * This function lets driver to enable the scaling filter property on a given * CRTC. * * RETURNS: * Zero for success or -errno
*/ int drm_crtc_create_scaling_filter_property(struct drm_crtc *crtc, unsignedint supported_filters)
{ struct drm_property *prop =
drm_create_scaling_filter_prop(crtc->dev, supported_filters);
/** * drm_crtc_in_clone_mode - check if the given CRTC state is in clone mode * * @crtc_state: CRTC state to check * * This function determines if the given CRTC state is being cloned by multiple * encoders. * * RETURNS: * True if the CRTC state is in clone mode. False otherwise
*/ bool drm_crtc_in_clone_mode(struct drm_crtc_state *crtc_state)
{ if (!crtc_state) returnfalse;
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