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![Daniel Vetter](/assets/img/avatar_default.png)
It's kinda really hard to get this wrong on a driver with both display and dma_resv locking. But who ever knows, so better to make sure that really all drivers nest these the same way. For actual lock semantics the acquire context nesting doesn't matter. But to teach lockdep what's going on with ww_mutex the acquire ctx is a fake lockdep lock, hence from a lockdep pov it does matter. That's why I figured better to include it. Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Christian König <christian.koenig@amd.com> Acked-by: Christian König <christian.koenig@amd.com> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191119210844.16947-2-daniel.vetter@ffwll.ch
534 lines
15 KiB
C
534 lines
15 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <linux/uaccess.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_encoder.h>
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#include <drm/drm_file.h>
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#include <drm/drm_mode_config.h>
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#include <drm/drm_print.h>
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#include <linux/dma-resv.h>
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#include "drm_crtc_internal.h"
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#include "drm_internal.h"
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int drm_modeset_register_all(struct drm_device *dev)
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{
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int ret;
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ret = drm_plane_register_all(dev);
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if (ret)
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goto err_plane;
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ret = drm_crtc_register_all(dev);
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if (ret)
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goto err_crtc;
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ret = drm_encoder_register_all(dev);
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if (ret)
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goto err_encoder;
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ret = drm_connector_register_all(dev);
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if (ret)
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goto err_connector;
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return 0;
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err_connector:
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drm_encoder_unregister_all(dev);
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err_encoder:
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drm_crtc_unregister_all(dev);
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err_crtc:
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drm_plane_unregister_all(dev);
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err_plane:
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return ret;
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}
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void drm_modeset_unregister_all(struct drm_device *dev)
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{
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drm_connector_unregister_all(dev);
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drm_encoder_unregister_all(dev);
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drm_crtc_unregister_all(dev);
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drm_plane_unregister_all(dev);
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}
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/**
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* drm_mode_getresources - get graphics configuration
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* @dev: drm device for the ioctl
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* @data: data pointer for the ioctl
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* @file_priv: drm file for the ioctl call
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*
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* Construct a set of configuration description structures and return
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* them to the user, including CRTC, connector and framebuffer configuration.
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*
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* Called by the user via ioctl.
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*
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* Returns:
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* Zero on success, negative errno on failure.
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*/
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int drm_mode_getresources(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_mode_card_res *card_res = data;
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struct drm_framebuffer *fb;
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struct drm_connector *connector;
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struct drm_crtc *crtc;
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struct drm_encoder *encoder;
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int count, ret = 0;
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uint32_t __user *fb_id;
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uint32_t __user *crtc_id;
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uint32_t __user *connector_id;
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uint32_t __user *encoder_id;
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struct drm_connector_list_iter conn_iter;
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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return -EOPNOTSUPP;
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mutex_lock(&file_priv->fbs_lock);
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count = 0;
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fb_id = u64_to_user_ptr(card_res->fb_id_ptr);
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list_for_each_entry(fb, &file_priv->fbs, filp_head) {
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if (count < card_res->count_fbs &&
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put_user(fb->base.id, fb_id + count)) {
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mutex_unlock(&file_priv->fbs_lock);
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return -EFAULT;
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}
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count++;
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}
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card_res->count_fbs = count;
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mutex_unlock(&file_priv->fbs_lock);
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card_res->max_height = dev->mode_config.max_height;
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card_res->min_height = dev->mode_config.min_height;
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card_res->max_width = dev->mode_config.max_width;
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card_res->min_width = dev->mode_config.min_width;
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count = 0;
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crtc_id = u64_to_user_ptr(card_res->crtc_id_ptr);
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drm_for_each_crtc(crtc, dev) {
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if (drm_lease_held(file_priv, crtc->base.id)) {
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if (count < card_res->count_crtcs &&
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put_user(crtc->base.id, crtc_id + count))
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return -EFAULT;
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count++;
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}
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}
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card_res->count_crtcs = count;
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count = 0;
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encoder_id = u64_to_user_ptr(card_res->encoder_id_ptr);
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drm_for_each_encoder(encoder, dev) {
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if (count < card_res->count_encoders &&
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put_user(encoder->base.id, encoder_id + count))
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return -EFAULT;
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count++;
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}
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card_res->count_encoders = count;
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drm_connector_list_iter_begin(dev, &conn_iter);
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count = 0;
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connector_id = u64_to_user_ptr(card_res->connector_id_ptr);
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drm_for_each_connector_iter(connector, &conn_iter) {
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/* only expose writeback connectors if userspace understands them */
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if (!file_priv->writeback_connectors &&
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(connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK))
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continue;
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if (drm_lease_held(file_priv, connector->base.id)) {
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if (count < card_res->count_connectors &&
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put_user(connector->base.id, connector_id + count)) {
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drm_connector_list_iter_end(&conn_iter);
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return -EFAULT;
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}
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count++;
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}
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}
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card_res->count_connectors = count;
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drm_connector_list_iter_end(&conn_iter);
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return ret;
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}
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/**
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* drm_mode_config_reset - call ->reset callbacks
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* @dev: drm device
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*
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* This functions calls all the crtc's, encoder's and connector's ->reset
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* callback. Drivers can use this in e.g. their driver load or resume code to
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* reset hardware and software state.
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*/
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void drm_mode_config_reset(struct drm_device *dev)
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{
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struct drm_crtc *crtc;
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struct drm_plane *plane;
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struct drm_encoder *encoder;
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struct drm_connector *connector;
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struct drm_connector_list_iter conn_iter;
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drm_for_each_plane(plane, dev)
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if (plane->funcs->reset)
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plane->funcs->reset(plane);
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drm_for_each_crtc(crtc, dev)
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if (crtc->funcs->reset)
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crtc->funcs->reset(crtc);
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drm_for_each_encoder(encoder, dev)
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if (encoder->funcs->reset)
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encoder->funcs->reset(encoder);
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drm_connector_list_iter_begin(dev, &conn_iter);
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drm_for_each_connector_iter(connector, &conn_iter)
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if (connector->funcs->reset)
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connector->funcs->reset(connector);
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drm_connector_list_iter_end(&conn_iter);
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}
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EXPORT_SYMBOL(drm_mode_config_reset);
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/*
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* Global properties
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*/
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static const struct drm_prop_enum_list drm_plane_type_enum_list[] = {
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{ DRM_PLANE_TYPE_OVERLAY, "Overlay" },
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{ DRM_PLANE_TYPE_PRIMARY, "Primary" },
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{ DRM_PLANE_TYPE_CURSOR, "Cursor" },
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};
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static int drm_mode_create_standard_properties(struct drm_device *dev)
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{
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struct drm_property *prop;
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int ret;
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ret = drm_connector_create_standard_properties(dev);
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if (ret)
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return ret;
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prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
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"type", drm_plane_type_enum_list,
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ARRAY_SIZE(drm_plane_type_enum_list));
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if (!prop)
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return -ENOMEM;
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dev->mode_config.plane_type_property = prop;
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prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
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"SRC_X", 0, UINT_MAX);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.prop_src_x = prop;
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prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
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"SRC_Y", 0, UINT_MAX);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.prop_src_y = prop;
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prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
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"SRC_W", 0, UINT_MAX);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.prop_src_w = prop;
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prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
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"SRC_H", 0, UINT_MAX);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.prop_src_h = prop;
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prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
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"CRTC_X", INT_MIN, INT_MAX);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.prop_crtc_x = prop;
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prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
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"CRTC_Y", INT_MIN, INT_MAX);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.prop_crtc_y = prop;
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prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
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"CRTC_W", 0, INT_MAX);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.prop_crtc_w = prop;
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prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
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"CRTC_H", 0, INT_MAX);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.prop_crtc_h = prop;
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prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
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"FB_ID", DRM_MODE_OBJECT_FB);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.prop_fb_id = prop;
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prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
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"IN_FENCE_FD", -1, INT_MAX);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.prop_in_fence_fd = prop;
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prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
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"OUT_FENCE_PTR", 0, U64_MAX);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.prop_out_fence_ptr = prop;
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prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
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"CRTC_ID", DRM_MODE_OBJECT_CRTC);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.prop_crtc_id = prop;
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prop = drm_property_create(dev,
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DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB,
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"FB_DAMAGE_CLIPS", 0);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.prop_fb_damage_clips = prop;
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prop = drm_property_create_bool(dev, DRM_MODE_PROP_ATOMIC,
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"ACTIVE");
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if (!prop)
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return -ENOMEM;
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dev->mode_config.prop_active = prop;
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prop = drm_property_create(dev,
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DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB,
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"MODE_ID", 0);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.prop_mode_id = prop;
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prop = drm_property_create_bool(dev, 0,
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"VRR_ENABLED");
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if (!prop)
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return -ENOMEM;
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dev->mode_config.prop_vrr_enabled = prop;
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prop = drm_property_create(dev,
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DRM_MODE_PROP_BLOB,
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"DEGAMMA_LUT", 0);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.degamma_lut_property = prop;
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prop = drm_property_create_range(dev,
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DRM_MODE_PROP_IMMUTABLE,
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"DEGAMMA_LUT_SIZE", 0, UINT_MAX);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.degamma_lut_size_property = prop;
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prop = drm_property_create(dev,
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DRM_MODE_PROP_BLOB,
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"CTM", 0);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.ctm_property = prop;
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prop = drm_property_create(dev,
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DRM_MODE_PROP_BLOB,
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"GAMMA_LUT", 0);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.gamma_lut_property = prop;
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prop = drm_property_create_range(dev,
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DRM_MODE_PROP_IMMUTABLE,
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"GAMMA_LUT_SIZE", 0, UINT_MAX);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.gamma_lut_size_property = prop;
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prop = drm_property_create(dev,
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DRM_MODE_PROP_IMMUTABLE | DRM_MODE_PROP_BLOB,
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"IN_FORMATS", 0);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.modifiers_property = prop;
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return 0;
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}
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/**
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* drm_mode_config_init - initialize DRM mode_configuration structure
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* @dev: DRM device
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*
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* Initialize @dev's mode_config structure, used for tracking the graphics
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* configuration of @dev.
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*
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* Since this initializes the modeset locks, no locking is possible. Which is no
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* problem, since this should happen single threaded at init time. It is the
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* driver's problem to ensure this guarantee.
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*
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*/
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void drm_mode_config_init(struct drm_device *dev)
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{
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mutex_init(&dev->mode_config.mutex);
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drm_modeset_lock_init(&dev->mode_config.connection_mutex);
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mutex_init(&dev->mode_config.idr_mutex);
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mutex_init(&dev->mode_config.fb_lock);
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mutex_init(&dev->mode_config.blob_lock);
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INIT_LIST_HEAD(&dev->mode_config.fb_list);
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INIT_LIST_HEAD(&dev->mode_config.crtc_list);
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INIT_LIST_HEAD(&dev->mode_config.connector_list);
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INIT_LIST_HEAD(&dev->mode_config.encoder_list);
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INIT_LIST_HEAD(&dev->mode_config.property_list);
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INIT_LIST_HEAD(&dev->mode_config.property_blob_list);
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INIT_LIST_HEAD(&dev->mode_config.plane_list);
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INIT_LIST_HEAD(&dev->mode_config.privobj_list);
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idr_init(&dev->mode_config.object_idr);
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idr_init(&dev->mode_config.tile_idr);
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ida_init(&dev->mode_config.connector_ida);
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spin_lock_init(&dev->mode_config.connector_list_lock);
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init_llist_head(&dev->mode_config.connector_free_list);
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INIT_WORK(&dev->mode_config.connector_free_work, drm_connector_free_work_fn);
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drm_mode_create_standard_properties(dev);
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/* Just to be sure */
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dev->mode_config.num_fb = 0;
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dev->mode_config.num_connector = 0;
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dev->mode_config.num_crtc = 0;
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dev->mode_config.num_encoder = 0;
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dev->mode_config.num_total_plane = 0;
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if (IS_ENABLED(CONFIG_LOCKDEP)) {
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struct drm_modeset_acquire_ctx modeset_ctx;
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struct ww_acquire_ctx resv_ctx;
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struct dma_resv resv;
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int ret;
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dma_resv_init(&resv);
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drm_modeset_acquire_init(&modeset_ctx, 0);
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ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
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&modeset_ctx);
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if (ret == -EDEADLK)
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ret = drm_modeset_backoff(&modeset_ctx);
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ww_acquire_init(&resv_ctx, &reservation_ww_class);
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ret = dma_resv_lock(&resv, &resv_ctx);
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if (ret == -EDEADLK)
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dma_resv_lock_slow(&resv, &resv_ctx);
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dma_resv_unlock(&resv);
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ww_acquire_fini(&resv_ctx);
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drm_modeset_drop_locks(&modeset_ctx);
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drm_modeset_acquire_fini(&modeset_ctx);
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dma_resv_fini(&resv);
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}
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}
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EXPORT_SYMBOL(drm_mode_config_init);
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/**
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* drm_mode_config_cleanup - free up DRM mode_config info
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* @dev: DRM device
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*
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* Free up all the connectors and CRTCs associated with this DRM device, then
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* free up the framebuffers and associated buffer objects.
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*
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* Note that since this /should/ happen single-threaded at driver/device
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* teardown time, no locking is required. It's the driver's job to ensure that
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* this guarantee actually holds true.
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*/
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void drm_mode_config_cleanup(struct drm_device *dev)
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{
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struct drm_connector *connector;
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struct drm_connector_list_iter conn_iter;
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struct drm_crtc *crtc, *ct;
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struct drm_encoder *encoder, *enct;
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struct drm_framebuffer *fb, *fbt;
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struct drm_property *property, *pt;
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struct drm_property_blob *blob, *bt;
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struct drm_plane *plane, *plt;
|
|
|
|
list_for_each_entry_safe(encoder, enct, &dev->mode_config.encoder_list,
|
|
head) {
|
|
encoder->funcs->destroy(encoder);
|
|
}
|
|
|
|
drm_connector_list_iter_begin(dev, &conn_iter);
|
|
drm_for_each_connector_iter(connector, &conn_iter) {
|
|
/* drm_connector_list_iter holds an full reference to the
|
|
* current connector itself, which means it is inherently safe
|
|
* against unreferencing the current connector - but not against
|
|
* deleting it right away. */
|
|
drm_connector_put(connector);
|
|
}
|
|
drm_connector_list_iter_end(&conn_iter);
|
|
/* connector_iter drops references in a work item. */
|
|
flush_work(&dev->mode_config.connector_free_work);
|
|
if (WARN_ON(!list_empty(&dev->mode_config.connector_list))) {
|
|
drm_connector_list_iter_begin(dev, &conn_iter);
|
|
drm_for_each_connector_iter(connector, &conn_iter)
|
|
DRM_ERROR("connector %s leaked!\n", connector->name);
|
|
drm_connector_list_iter_end(&conn_iter);
|
|
}
|
|
|
|
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_blob_put(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) {
|
|
struct drm_printer p = drm_debug_printer("[leaked fb]");
|
|
drm_printf(&p, "framebuffer[%u]:\n", fb->base.id);
|
|
drm_framebuffer_print_info(&p, 1, fb);
|
|
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.object_idr);
|
|
drm_modeset_lock_fini(&dev->mode_config.connection_mutex);
|
|
}
|
|
EXPORT_SYMBOL(drm_mode_config_cleanup);
|