Linux 4.9.243

[linux/fpc-iii.git] / drivers / gpu / drm / drm_crtc.c

/*
 * 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 <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_modeset_lock.h>
#include <drm/drm_atomic.h>
#include <drm/drm_auth.h>
#include <drm/drm_framebuffer.h>

#include "drm_crtc_internal.h"
#include "drm_internal.h"

/*
 * Global properties
 */
static const struct drm_prop_enum_list drm_plane_type_enum_list[] = {
        { DRM_PLANE_TYPE_OVERLAY, "Overlay" },
        { DRM_PLANE_TYPE_PRIMARY, "Primary" },
        { DRM_PLANE_TYPE_CURSOR, "Cursor" },
};

/*
 * Optional properties
 */
/**
 * drm_crtc_force_disable - Forcibly turn off a CRTC
 * @crtc: CRTC to turn off
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int drm_crtc_force_disable(struct drm_crtc *crtc)
{
        struct drm_mode_set set = {
                .crtc = crtc,
        };

        return drm_mode_set_config_internal(&set);
}
EXPORT_SYMBOL(drm_crtc_force_disable);

/**
 * drm_crtc_force_disable_all - Forcibly turn off all enabled CRTCs
 * @dev: DRM device whose CRTCs to turn off
 *
 * Drivers may want to call this on unload to ensure that all displays are
 * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int drm_crtc_force_disable_all(struct drm_device *dev)
{
        struct drm_crtc *crtc;
        int ret = 0;

        drm_modeset_lock_all(dev);
        drm_for_each_crtc(crtc, dev)
                if (crtc->enabled) {
                        ret = drm_crtc_force_disable(crtc);
                        if (ret)
                                goto out;
                }
out:
        drm_modeset_unlock_all(dev);
        return ret;
}
EXPORT_SYMBOL(drm_crtc_force_disable_all);

DEFINE_WW_CLASS(crtc_ww_class);

static unsigned int drm_num_crtcs(struct drm_device *dev)
{
        unsigned int num = 0;
        struct drm_crtc *tmp;

        drm_for_each_crtc(tmp, dev) {
                num++;
        }

        return num;
}

static int drm_crtc_register_all(struct drm_device *dev)
{
        struct drm_crtc *crtc;
        int ret = 0;

        drm_for_each_crtc(crtc, dev) {
                if (crtc->funcs->late_register)
                        ret = crtc->funcs->late_register(crtc);
                if (ret)
                        return ret;
        }

        return 0;
}

static void drm_crtc_unregister_all(struct drm_device *dev)
{
        struct drm_crtc *crtc;

        drm_for_each_crtc(crtc, dev) {
                if (crtc->funcs->early_unregister)
                        crtc->funcs->early_unregister(crtc);
        }
}

/**
 * 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.
 *
 * 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,
                              const struct drm_crtc_funcs *funcs,
                              const char *name, ...)
{
        struct drm_mode_config *config = &dev->mode_config;
        int ret;

        WARN_ON(primary && primary->type != DRM_PLANE_TYPE_PRIMARY);
        WARN_ON(cursor && cursor->type != DRM_PLANE_TYPE_CURSOR);

        crtc->dev = dev;
        crtc->funcs = funcs;

        INIT_LIST_HEAD(&crtc->commit_list);
        spin_lock_init(&crtc->commit_lock);

        drm_modeset_lock_init(&crtc->mutex);
        ret = drm_mode_object_get(dev, &crtc->base, DRM_MODE_OBJECT_CRTC);
        if (ret)
                return ret;

        if (name) {
                va_list ap;

                va_start(ap, name);
                crtc->name = kvasprintf(GFP_KERNEL, name, ap);
                va_end(ap);
        } else {
                crtc->name = kasprintf(GFP_KERNEL, "crtc-%d",
                                       drm_num_crtcs(dev));
        }
        if (!crtc->name) {
                drm_mode_object_unregister(dev, &crtc->base);
                return -ENOMEM;
        }

        crtc->base.properties = &crtc->properties;

        list_add_tail(&crtc->head, &config->crtc_list);
        crtc->index = config->num_crtc++;

        crtc->primary = primary;
        crtc->cursor = cursor;
        if (primary)
                primary->possible_crtcs = 1 << drm_crtc_index(crtc);
        if (cursor)
                cursor->possible_crtcs = 1 << drm_crtc_index(crtc);

        if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
                drm_object_attach_property(&crtc->base, config->prop_active, 0);
                drm_object_attach_property(&crtc->base, config->prop_mode_id, 0);
        }

        return 0;
}
EXPORT_SYMBOL(drm_crtc_init_with_planes);

/**
 * 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.
         */

        kfree(crtc->gamma_store);
        crtc->gamma_store = NULL;

        drm_modeset_lock_fini(&crtc->mutex);

        drm_mode_object_unregister(dev, &crtc->base);
        list_del(&crtc->head);
        dev->mode_config.num_crtc--;

        WARN_ON(crtc->state && !crtc->funcs->atomic_destroy_state);
        if (crtc->state && crtc->funcs->atomic_destroy_state)
                crtc->funcs->atomic_destroy_state(crtc, crtc->state);

        kfree(crtc->name);

        memset(crtc, 0, sizeof(*crtc));
}
EXPORT_SYMBOL(drm_crtc_cleanup);

int drm_modeset_register_all(struct drm_device *dev)
{
        int ret;

        ret = drm_plane_register_all(dev);
        if (ret)
                goto err_plane;

        ret = drm_crtc_register_all(dev);
        if  (ret)
                goto err_crtc;

        ret = drm_encoder_register_all(dev);
        if (ret)
                goto err_encoder;

        ret = drm_connector_register_all(dev);
        if (ret)
                goto err_connector;

        return 0;

err_connector:
        drm_encoder_unregister_all(dev);
err_encoder:
        drm_crtc_unregister_all(dev);
err_crtc:
        drm_plane_unregister_all(dev);
err_plane:
        return ret;
}

void drm_modeset_unregister_all(struct drm_device *dev)
{
        drm_connector_unregister_all(dev);
        drm_encoder_unregister_all(dev);
        drm_crtc_unregister_all(dev);
        drm_plane_unregister_all(dev);
}

static int drm_mode_create_standard_properties(struct drm_device *dev)
{
        struct drm_property *prop;
        int ret;

        ret = drm_connector_create_standard_properties(dev);
        if (ret)
                return ret;

        prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
                                        "type", drm_plane_type_enum_list,
                                        ARRAY_SIZE(drm_plane_type_enum_list));
        if (!prop)
                return -ENOMEM;
        dev->mode_config.plane_type_property = prop;

        prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
                        "SRC_X", 0, UINT_MAX);
        if (!prop)
                return -ENOMEM;
        dev->mode_config.prop_src_x = prop;

        prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
                        "SRC_Y", 0, UINT_MAX);
        if (!prop)
                return -ENOMEM;
        dev->mode_config.prop_src_y = prop;

        prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
                        "SRC_W", 0, UINT_MAX);
        if (!prop)
                return -ENOMEM;
        dev->mode_config.prop_src_w = prop;

        prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
                        "SRC_H", 0, UINT_MAX);
        if (!prop)
                return -ENOMEM;
        dev->mode_config.prop_src_h = prop;

        prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
                        "CRTC_X", INT_MIN, INT_MAX);
        if (!prop)
                return -ENOMEM;
        dev->mode_config.prop_crtc_x = prop;

        prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
                        "CRTC_Y", INT_MIN, INT_MAX);
        if (!prop)
                return -ENOMEM;
        dev->mode_config.prop_crtc_y = prop;

        prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
                        "CRTC_W", 0, INT_MAX);
        if (!prop)
                return -ENOMEM;
        dev->mode_config.prop_crtc_w = prop;

        prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
                        "CRTC_H", 0, INT_MAX);
        if (!prop)
                return -ENOMEM;
        dev->mode_config.prop_crtc_h = prop;

        prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
                        "FB_ID", DRM_MODE_OBJECT_FB);
        if (!prop)
                return -ENOMEM;
        dev->mode_config.prop_fb_id = prop;

        prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
                        "CRTC_ID", DRM_MODE_OBJECT_CRTC);
        if (!prop)
                return -ENOMEM;
        dev->mode_config.prop_crtc_id = prop;

        prop = drm_property_create_bool(dev, DRM_MODE_PROP_ATOMIC,
                        "ACTIVE");
        if (!prop)
                return -ENOMEM;
        dev->mode_config.prop_active = prop;

        prop = drm_property_create(dev,
                        DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB,
                        "MODE_ID", 0);
        if (!prop)
                return -ENOMEM;
        dev->mode_config.prop_mode_id = prop;

        prop = drm_property_create(dev,
                        DRM_MODE_PROP_BLOB,
                        "DEGAMMA_LUT", 0);
        if (!prop)
                return -ENOMEM;
        dev->mode_config.degamma_lut_property = prop;

        prop = drm_property_create_range(dev,
                        DRM_MODE_PROP_IMMUTABLE,
                        "DEGAMMA_LUT_SIZE", 0, UINT_MAX);
        if (!prop)
                return -ENOMEM;
        dev->mode_config.degamma_lut_size_property = prop;

        prop = drm_property_create(dev,
                        DRM_MODE_PROP_BLOB,
                        "CTM", 0);
        if (!prop)
                return -ENOMEM;
        dev->mode_config.ctm_property = prop;

        prop = drm_property_create(dev,
                        DRM_MODE_PROP_BLOB,
                        "GAMMA_LUT", 0);
        if (!prop)
                return -ENOMEM;
        dev->mode_config.gamma_lut_property = prop;

        prop = drm_property_create_range(dev,
                        DRM_MODE_PROP_IMMUTABLE,
                        "GAMMA_LUT_SIZE", 0, UINT_MAX);
        if (!prop)
                return -ENOMEM;
        dev->mode_config.gamma_lut_size_property = prop;

        return 0;
}

/**
 * drm_mode_getresources - get graphics configuration
 * @dev: drm device for the ioctl
 * @data: data pointer for the ioctl
 * @file_priv: drm file for the ioctl call
 *
 * Construct a set of configuration description structures and return
 * them to the user, including CRTC, connector and framebuffer configuration.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_getresources(struct drm_device *dev, void *data,
                          struct drm_file *file_priv)
{
        struct drm_mode_card_res *card_res = data;
        struct list_head *lh;
        struct drm_framebuffer *fb;
        struct drm_connector *connector;
        struct drm_crtc *crtc;
        struct drm_encoder *encoder;
        int ret = 0;
        int connector_count = 0;
        int crtc_count = 0;
        int fb_count = 0;
        int encoder_count = 0;
        int copied = 0;
        uint32_t __user *fb_id;
        uint32_t __user *crtc_id;
        uint32_t __user *connector_id;
        uint32_t __user *encoder_id;

        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -EINVAL;


        mutex_lock(&file_priv->fbs_lock);
        /*
         * For the non-control nodes we need to limit the list of resources
         * by IDs in the group list for this node
         */
        list_for_each(lh, &file_priv->fbs)
                fb_count++;

        /* handle this in 4 parts */
        /* FBs */
        if (card_res->count_fbs >= fb_count) {
                copied = 0;
                fb_id = (uint32_t __user *)(unsigned long)card_res->fb_id_ptr;
                list_for_each_entry(fb, &file_priv->fbs, filp_head) {
                        if (put_user(fb->base.id, fb_id + copied)) {
                                mutex_unlock(&file_priv->fbs_lock);
                                return -EFAULT;
                        }
                        copied++;
                }
        }
        card_res->count_fbs = fb_count;
        mutex_unlock(&file_priv->fbs_lock);

        /* mode_config.mutex protects the connector list against e.g. DP MST
         * connector hot-adding. CRTC/Plane lists are invariant. */
        mutex_lock(&dev->mode_config.mutex);
        drm_for_each_crtc(crtc, dev)
                crtc_count++;

        drm_for_each_connector(connector, dev)
                connector_count++;

        drm_for_each_encoder(encoder, dev)
                encoder_count++;

        card_res->max_height = dev->mode_config.max_height;
        card_res->min_height = dev->mode_config.min_height;
        card_res->max_width = dev->mode_config.max_width;
        card_res->min_width = dev->mode_config.min_width;

        /* CRTCs */
        if (card_res->count_crtcs >= crtc_count) {
                copied = 0;
                crtc_id = (uint32_t __user *)(unsigned long)card_res->crtc_id_ptr;
                drm_for_each_crtc(crtc, dev) {
                        if (put_user(crtc->base.id, crtc_id + copied)) {
                                ret = -EFAULT;
                                goto out;
                        }
                        copied++;
                }
        }
        card_res->count_crtcs = crtc_count;

        /* Encoders */
        if (card_res->count_encoders >= encoder_count) {
                copied = 0;
                encoder_id = (uint32_t __user *)(unsigned long)card_res->encoder_id_ptr;
                drm_for_each_encoder(encoder, dev) {
                        if (put_user(encoder->base.id, encoder_id +
                                     copied)) {
                                ret = -EFAULT;
                                goto out;
                        }
                        copied++;
                }
        }
        card_res->count_encoders = encoder_count;

        /* Connectors */
        if (card_res->count_connectors >= connector_count) {
                copied = 0;
                connector_id = (uint32_t __user *)(unsigned long)card_res->connector_id_ptr;
                drm_for_each_connector(connector, dev) {
                        if (put_user(connector->base.id,
                                     connector_id + copied)) {
                                ret = -EFAULT;
                                goto out;
                        }
                        copied++;
                }
        }
        card_res->count_connectors = connector_count;

out:
        mutex_unlock(&dev->mode_config.mutex);
        return ret;
}

/**
 * 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;

        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -EINVAL;

        crtc = drm_crtc_find(dev, crtc_resp->crtc_id);
        if (!crtc)
                return -ENOENT;

        drm_modeset_lock_crtc(crtc, crtc->primary);
        crtc_resp->gamma_size = crtc->gamma_size;
        if (crtc->primary->fb)
                crtc_resp->fb_id = crtc->primary->fb->base.id;
        else
                crtc_resp->fb_id = 0;

        if (crtc->state) {
                crtc_resp->x = crtc->primary->state->src_x >> 16;
                crtc_resp->y = crtc->primary->state->src_y >> 16;
                if (crtc->state->enable) {
                        drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->state->mode);
                        crtc_resp->mode_valid = 1;

                } else {
                        crtc_resp->mode_valid = 0;
                }
        } else {
                crtc_resp->x = crtc->x;
                crtc_resp->y = crtc->y;
                if (crtc->enabled) {
                        drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->mode);
                        crtc_resp->mode_valid = 1;

                } else {
                        crtc_resp->mode_valid = 0;
                }
        }
        drm_modeset_unlock_crtc(crtc);

        return 0;
}

/**
 * drm_mode_set_config_internal - helper to call ->set_config
 * @set: modeset config to set
 *
 * This is a little helper to wrap internal calls to the ->set_config driver
 * interface. The only thing it adds is correct refcounting dance.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_set_config_internal(struct drm_mode_set *set)
{
        struct drm_crtc *crtc = set->crtc;
        struct drm_framebuffer *fb;
        struct drm_crtc *tmp;
        int ret;

        /*
         * 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)
                tmp->primary->old_fb = tmp->primary->fb;

        fb = set->fb;

        ret = crtc->funcs->set_config(set);
        if (ret == 0) {
                crtc->primary->crtc = crtc;
                crtc->primary->fb = fb;
        }

        drm_for_each_crtc(tmp, crtc->dev) {
                if (tmp->primary->fb)
                        drm_framebuffer_reference(tmp->primary->fb);
                if (tmp->primary->old_fb)
                        drm_framebuffer_unreference(tmp->primary->old_fb);
                tmp->primary->old_fb = NULL;
        }

        return ret;
}
EXPORT_SYMBOL(drm_mode_set_config_internal);

/**
 * drm_crtc_get_hv_timing - Fetches hdisplay/vdisplay for given mode
 * @mode: mode to query
 * @hdisplay: hdisplay value to fill in
 * @vdisplay: vdisplay value to fill in
 *
 * The vdisplay value will be doubled if the specified mode is a stereo mode of
 * the appropriate layout.
 */
void drm_crtc_get_hv_timing(const struct drm_display_mode *mode,
                            int *hdisplay, int *vdisplay)
{
        struct drm_display_mode adjusted;

        drm_mode_copy(&adjusted, mode);
        drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
        *hdisplay = adjusted.crtc_hdisplay;
        *vdisplay = adjusted.crtc_vdisplay;
}
EXPORT_SYMBOL(drm_crtc_get_hv_timing);

/**
 * 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(const struct drm_crtc *crtc,
                            int x, int y,
                            const struct drm_display_mode *mode,
                            const struct drm_framebuffer *fb)

{
        int hdisplay, vdisplay;

        drm_crtc_get_hv_timing(mode, &hdisplay, &vdisplay);

        if (crtc->state &&
            crtc->primary->state->rotation & (DRM_ROTATE_90 |
                                              DRM_ROTATE_270))
                swap(hdisplay, vdisplay);

        return drm_framebuffer_check_src_coords(x << 16, y << 16,
                                                hdisplay << 16, vdisplay << 16,
                                                fb);
}
EXPORT_SYMBOL(drm_crtc_check_viewport);

/**
 * 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_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;
        int ret;
        int i;

        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -EINVAL;

        /*
         * 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;

        drm_modeset_lock_all(dev);
        crtc = drm_crtc_find(dev, crtc_req->crtc_id);
        if (!crtc) {
                DRM_DEBUG_KMS("Unknown CRTC ID %d\n", crtc_req->crtc_id);
                ret = -ENOENT;
                goto out;
        }
        DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);

        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) {
                        if (!crtc->primary->fb) {
                                DRM_DEBUG_KMS("CRTC doesn't have current FB\n");
                                ret = -EINVAL;
                                goto out;
                        }
                        fb = crtc->primary->fb;
                        /* Make refcounting symmetric with the lookup path. */
                        drm_framebuffer_reference(fb);
                } else {
                        fb = drm_framebuffer_lookup(dev, crtc_req->fb_id);
                        if (!fb) {
                                DRM_DEBUG_KMS("Unknown FB ID%d\n",
                                                crtc_req->fb_id);
                                ret = -ENOENT;
                                goto out;
                        }
                }

                mode = drm_mode_create(dev);
                if (!mode) {
                        ret = -ENOMEM;
                        goto out;
                }

                ret = drm_mode_convert_umode(mode, &crtc_req->mode);
                if (ret) {
                        DRM_DEBUG_KMS("Invalid mode\n");
                        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 (!crtc->primary->format_default) {
                        ret = drm_plane_check_pixel_format(crtc->primary,
                                                           fb->pixel_format);
                        if (ret) {
                                char *format_name = drm_get_format_name(fb->pixel_format);
                                DRM_DEBUG_KMS("Invalid pixel format %s\n", format_name);
                                kfree(format_name);
                                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_DEBUG_KMS("Count connectors is 0 but mode set\n");
                ret = -EINVAL;
                goto out;
        }

        if (crtc_req->count_connectors > 0 && (!mode || !fb)) {
                DRM_DEBUG_KMS("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 *)(unsigned long)crtc_req->set_connectors_ptr;
                        if (get_user(out_id, &set_connectors_ptr[i])) {
                                ret = -EFAULT;
                                goto out;
                        }

                        connector = drm_connector_lookup(dev, out_id);
                        if (!connector) {
                                DRM_DEBUG_KMS("Connector id %d unknown\n",
                                                out_id);
                                ret = -ENOENT;
                                goto out;
                        }
                        DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
                                        connector->base.id,
                                        connector->name);

                        connector_set[i] = connector;
                }
        }

        set.crtc = crtc;
        set.x = crtc_req->x;
        set.y = crtc_req->y;
        set.mode = mode;
        set.connectors = connector_set;
        set.num_connectors = crtc_req->count_connectors;
        set.fb = fb;
        ret = drm_mode_set_config_internal(&set);

out:
        if (fb)
                drm_framebuffer_unreference(fb);

        if (connector_set) {
                for (i = 0; i < crtc_req->count_connectors; i++) {
                        if (connector_set[i])
                                drm_connector_unreference(connector_set[i]);
                }
        }
        kfree(connector_set);
        drm_mode_destroy(dev, mode);
        drm_modeset_unlock_all(dev);
        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_mode_config_reset - call ->reset callbacks
 * @dev: drm device
 *
 * This functions calls all the crtc's, encoder's and connector's ->reset
 * callback. Drivers can use this in e.g. their driver load or resume code to
 * reset hardware and software state.
 */
void drm_mode_config_reset(struct drm_device *dev)
{
        struct drm_crtc *crtc;
        struct drm_plane *plane;
        struct drm_encoder *encoder;
        struct drm_connector *connector;

        drm_for_each_plane(plane, dev)
                if (plane->funcs->reset)
                        plane->funcs->reset(plane);

        drm_for_each_crtc(crtc, dev)
                if (crtc->funcs->reset)
                        crtc->funcs->reset(crtc);

        drm_for_each_encoder(encoder, dev)
                if (encoder->funcs->reset)
                        encoder->funcs->reset(encoder);

        mutex_lock(&dev->mode_config.mutex);
        drm_for_each_connector(connector, dev)
                if (connector->funcs->reset)
                        connector->funcs->reset(connector);
        mutex_unlock(&dev->mode_config.mutex);
}
EXPORT_SYMBOL(drm_mode_config_reset);

/**
 * drm_mode_create_dumb_ioctl - create a dumb backing storage buffer
 * @dev: DRM device
 * @data: ioctl data
 * @file_priv: DRM file info
 *
 * This creates a new dumb buffer in the driver's backing storage manager (GEM,
 * TTM or something else entirely) and returns the resulting buffer handle. This
 * handle can then be wrapped up into a framebuffer modeset object.
 *
 * Note that userspace is not allowed to use such objects for render
 * acceleration - drivers must create their own private ioctls for such a use
 * case.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_create_dumb_ioctl(struct drm_device *dev,
                               void *data, struct drm_file *file_priv)
{
        struct drm_mode_create_dumb *args = data;
        u32 cpp, stride, size;

        if (!dev->driver->dumb_create)
                return -ENOSYS;
        if (!args->width || !args->height || !args->bpp)
                return -EINVAL;

        /* overflow checks for 32bit size calculations */
        /* NOTE: DIV_ROUND_UP() can overflow */
        cpp = DIV_ROUND_UP(args->bpp, 8);
        if (!cpp || cpp > 0xffffffffU / args->width)
                return -EINVAL;
        stride = cpp * args->width;
        if (args->height > 0xffffffffU / stride)
                return -EINVAL;

        /* test for wrap-around */
        size = args->height * stride;
        if (PAGE_ALIGN(size) == 0)
                return -EINVAL;

        /*
         * handle, pitch and size are output parameters. Zero them out to
         * prevent drivers from accidentally using uninitialized data. Since
         * not all existing userspace is clearing these fields properly we
         * cannot reject IOCTL with garbage in them.
         */
        args->handle = 0;
        args->pitch = 0;
        args->size = 0;

        return dev->driver->dumb_create(file_priv, dev, args);
}

/**
 * drm_mode_mmap_dumb_ioctl - create an mmap offset for a dumb backing storage buffer
 * @dev: DRM device
 * @data: ioctl data
 * @file_priv: DRM file info
 *
 * Allocate an offset in the drm device node's address space to be able to
 * memory map a dumb buffer.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_mmap_dumb_ioctl(struct drm_device *dev,
                             void *data, struct drm_file *file_priv)
{
        struct drm_mode_map_dumb *args = data;

        /* call driver ioctl to get mmap offset */
        if (!dev->driver->dumb_map_offset)
                return -ENOSYS;

        return dev->driver->dumb_map_offset(file_priv, dev, args->handle, &args->offset);
}

/**
 * drm_mode_destroy_dumb_ioctl - destroy a dumb backing strage buffer
 * @dev: DRM device
 * @data: ioctl data
 * @file_priv: DRM file info
 *
 * This destroys the userspace handle for the given dumb backing storage buffer.
 * Since buffer objects must be reference counted in the kernel a buffer object
 * won't be immediately freed if a framebuffer modeset object still uses it.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_destroy_dumb_ioctl(struct drm_device *dev,
                                void *data, struct drm_file *file_priv)
{
        struct drm_mode_destroy_dumb *args = data;

        if (!dev->driver->dumb_destroy)
                return -ENOSYS;

        return dev->driver->dumb_destroy(file_priv, dev, args->handle);
}

/**
 * drm_mode_config_init - initialize DRM mode_configuration structure
 * @dev: DRM device
 *
 * Initialize @dev's mode_config structure, used for tracking the graphics
 * configuration of @dev.
 *
 * Since this initializes the modeset locks, no locking is possible. Which is no
 * problem, since this should happen single threaded at init time. It is the
 * driver's problem to ensure this guarantee.
 *
 */
void drm_mode_config_init(struct drm_device *dev)
{
        mutex_init(&dev->mode_config.mutex);
        drm_modeset_lock_init(&dev->mode_config.connection_mutex);
        mutex_init(&dev->mode_config.idr_mutex);
        mutex_init(&dev->mode_config.fb_lock);
        mutex_init(&dev->mode_config.blob_lock);
        INIT_LIST_HEAD(&dev->mode_config.fb_list);
        INIT_LIST_HEAD(&dev->mode_config.crtc_list);
        INIT_LIST_HEAD(&dev->mode_config.connector_list);
        INIT_LIST_HEAD(&dev->mode_config.encoder_list);
        INIT_LIST_HEAD(&dev->mode_config.property_list);
        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);
        ida_init(&dev->mode_config.connector_ida);

        drm_modeset_lock_all(dev);
        drm_mode_create_standard_properties(dev);
        drm_modeset_unlock_all(dev);

        /* Just to be sure */
        dev->mode_config.num_fb = 0;
        dev->mode_config.num_connector = 0;
        dev->mode_config.num_crtc = 0;
        dev->mode_config.num_encoder = 0;
        dev->mode_config.num_overlay_plane = 0;
        dev->mode_config.num_total_plane = 0;
}
EXPORT_SYMBOL(drm_mode_config_init);

/**
 * drm_mode_config_cleanup - free up DRM mode_config info
 * @dev: DRM device
 *
 * Free up all the connectors and CRTCs associated with this DRM device, then
 * free up the framebuffers and associated buffer objects.
 *
 * Note that since this /should/ happen single-threaded at driver/device
 * teardown time, no locking is required. It's the driver's job to ensure that
 * this guarantee actually holds true.
 *
 * FIXME: cleanup any dangling user buffer objects too
 */
void drm_mode_config_cleanup(struct drm_device *dev)
{
        struct drm_connector *connector, *ot;
        struct drm_crtc *crtc, *ct;
        struct drm_encoder *encoder, *enct;
        struct drm_framebuffer *fb, *fbt;
        struct drm_property *property, *pt;
        struct drm_property_blob *blob, *bt;
        struct drm_plane *plane, *plt;

        list_for_each_entry_safe(encoder, enct, &dev->mode_config.encoder_list,
                                 head) {
                encoder->funcs->destroy(encoder);
        }

        list_for_each_entry_safe(connector, ot,
                                 &dev->mode_config.connector_list, head) {
                connector->funcs->destroy(connector);
        }

        list_for_each_entry_safe(property, pt, &dev->mode_config.property_list,
                                 head) {
                drm_property_destroy(dev, property);
        }

        list_for_each_entry_safe(plane, plt, &dev->mode_config.plane_list,
                                 head) {
                plane->funcs->destroy(plane);
        }

        list_for_each_entry_safe(crtc, ct, &dev->mode_config.crtc_list, head) {
                crtc->funcs->destroy(crtc);
        }

        list_for_each_entry_safe(blob, bt, &dev->mode_config.property_blob_list,
                                 head_global) {
                drm_property_unreference_blob(blob);
        }

        /*
         * Single-threaded teardown context, so it's not required to grab the
         * fb_lock to protect against concurrent fb_list access. Contrary, it
         * would actually deadlock with the drm_framebuffer_cleanup function.
         *
         * Also, if there are any framebuffers left, that's a driver leak now,
         * so politely WARN about this.
         */
        WARN_ON(!list_empty(&dev->mode_config.fb_list));
        list_for_each_entry_safe(fb, fbt, &dev->mode_config.fb_list, head) {
                drm_framebuffer_free(&fb->base.refcount);
        }

        ida_destroy(&dev->mode_config.connector_ida);
        idr_destroy(&dev->mode_config.tile_idr);
        idr_destroy(&dev->mode_config.crtc_idr);
        drm_modeset_lock_fini(&dev->mode_config.connection_mutex);
}
EXPORT_SYMBOL(drm_mode_config_cleanup);

/**
 * DOC: Tile group
 *
 * Tile groups are used to represent tiled monitors with a unique
 * integer identifier. Tiled monitors using DisplayID v1.3 have
 * a unique 8-byte handle, we store this in a tile group, so we
 * have a common identifier for all tiles in a monitor group.
 */
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_unlock(&dev->mode_config.idr_mutex);
        kfree(tg);
}

/**
 * drm_mode_put_tile_group - drop a reference to a tile group.
 * @dev: DRM device
 * @tg: tile group to drop reference to.
 *
 * drop reference to tile group and free if 0.
 */
void drm_mode_put_tile_group(struct drm_device *dev,
                             struct drm_tile_group *tg)
{
        kref_put(&tg->refcount, drm_tile_group_free);
}

/**
 * drm_mode_get_tile_group - get a reference to an existing tile group
 * @dev: DRM device
 * @topology: 8-bytes unique per monitor.
 *
 * Use the unique bytes to get a reference to an existing tile group.
 *
 * RETURNS:
 * tile group or NULL if not found.
 */
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)) {
                        if (!kref_get_unless_zero(&tg->refcount))
                                tg = NULL;
                        mutex_unlock(&dev->mode_config.idr_mutex);
                        return tg;
                }
        }
        mutex_unlock(&dev->mode_config.idr_mutex);
        return NULL;
}
EXPORT_SYMBOL(drm_mode_get_tile_group);

/**
 * drm_mode_create_tile_group - create a tile group from a displayid description
 * @dev: DRM device
 * @topology: 8-bytes unique per monitor.
 *
 * Create a tile group for the unique monitor, and get a unique
 * identifier for the tile group.
 *
 * RETURNS:
 * new tile group or error.
 */
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 = ERR_PTR(ret);
        }

        mutex_unlock(&dev->mode_config.idr_mutex);
        return tg;
}
EXPORT_SYMBOL(drm_mode_create_tile_group);