/* * Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved. */ /** * \file drm_fops.c * File operations for DRM * * \author Rickard E. (Rik) Faith * \author Daryll Strauss * \author Gareth Hughes */ /* * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com * * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. * Copyright (c) 2009, 2013, Intel Corporation. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ #include "drmP.h" static int drm_open_helper(struct drm_minor *minor, int clone_id, int flags, cred_t *credp); static __inline__ int drm_device_is_agp(struct drm_device *dev) { if (drm_core_check_feature(dev, DRIVER_USE_PLATFORM_DEVICE)) return 0; if (dev->driver->device_is_agp != NULL) { int err = (*dev->driver->device_is_agp) (dev); if (err != 2) { return err; } } return pci_find_capability(dev->pdev, PCI_CAP_ID_AGP); } static int drm_setup(struct drm_device * dev) { int i; int ret; static bool first_call = true; if (first_call) { /* OSOL_drm: moved from drm_fill_in_dev */ if (drm_core_has_AGP(dev)) { if (drm_device_is_agp(dev)) dev->agp = drm_agp_init(dev); if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP) && (dev->agp == NULL)) { DRM_ERROR("Cannot initialize the agpgart module.\n"); return -EINVAL; } } } if (dev->driver->firstopen) { ret = dev->driver->firstopen(dev); if (ret != 0) return ret; } if (first_call) { /* OSOL_drm: moved from drm_get_dev */ /* setup the grouping for the legacy output */ if (drm_core_check_feature(dev, DRIVER_MODESET)) { ret = drm_mode_group_init_legacy_group(dev, &dev->primary->mode_group); if (ret) return ret; } } atomic_set(&dev->ioctl_count, 0); if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && !drm_core_check_feature(dev, DRIVER_MODESET)) { dev->buf_use = 0; atomic_set(&dev->buf_alloc, 0); i = drm_dma_setup(dev); if (i < 0) return i; } for (i = 0; i < DRM_ARRAY_SIZE(dev->counts); i++) atomic_set(&dev->counts[i], 0); dev->context_flag = 0; dev->last_context = 0; dev->if_version = 0; DRM_DEBUG("\n"); /* * The kernel's context could be created here, but is now created * in drm_dma_enqueue. This is more resource-efficient for * hardware that does not do DMA, but may mean that * drm_select_queue fails between the time the interrupt is * initialized and the time the queues are initialized. */ first_call = false; return 0; } /** * Open file. * * \return zero on success or a negative number on failure. * * Searches the DRM device with the same minor number, calls open_helper(), and * increments the device open count. If the open count was previous at zero, * i.e., it's the first that the device is open, then calls setup(). */ int drm_open(struct drm_minor *minor, int clone_id, int flags, cred_t *credp) { struct drm_device *dev = minor->dev; int retcode = 0; DRM_DEBUG("minor->index=%d, clone_id=%d", minor->index, clone_id); retcode = drm_open_helper(minor, clone_id, flags, credp); if (!retcode) { atomic_inc(&dev->counts[_DRM_STAT_OPENS]); spin_lock(&dev->count_lock); if (!dev->open_count++) { spin_unlock(&dev->count_lock); retcode = drm_setup(dev); goto out; } spin_unlock(&dev->count_lock); } out: return retcode; } /** * Called whenever a process opens /dev/drm. * * Creates and initializes a drm_file structure for the file private data in \p * filp and add it into the double linked list in \p dev. */ static int drm_open_helper(struct drm_minor *minor, int clone_id, int flags, cred_t *credp) { struct drm_device *dev = minor->dev; struct drm_file *priv; int minor_id = minor->index; int ret; if (flags & FEXCL) return -EBUSY; /* No exclusive opens */ if (dev->switch_power_state != DRM_SWITCH_POWER_ON) return -EINVAL; DRM_DEBUG("pid = %d, minor = %d\n", ddi_get_pid(), minor_id); priv = kmalloc(sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; (void) memset(priv, 0, sizeof(*priv)); (void) idr_replace(&minor->clone_idr, priv, clone_id); /* OSOL_drm */ priv->uid = crgetsuid(credp); priv->pid = ddi_get_pid(); priv->minor = minor; priv->ioctl_count = 0; /* for compatibility root is always authenticated */ priv->authenticated = DRM_SUSER(credp); priv->lock_count = 0; INIT_LIST_HEAD(&priv->lhead); INIT_LIST_HEAD(&priv->fbs); mutex_init(&priv->fbs_lock, NULL, MUTEX_DRIVER, NULL); INIT_LIST_HEAD(&priv->event_list); DRM_INIT_WAITQUEUE(&priv->event_wait, DRM_INTR_PRI(dev)); priv->event_space = 4096; /* set aside 4k for event buffer */ if (dev->driver->driver_features & DRIVER_GEM) drm_gem_open(dev, priv); if (dev->driver->open) { ret = dev->driver->open(dev, priv); if (ret < 0) goto out_free; } /* if there is no current master make this fd it */ mutex_lock(&dev->struct_mutex); if (!priv->minor->master) { /* create a new master */ priv->minor->master = drm_master_create(priv->minor); if (!priv->minor->master) { mutex_unlock(&dev->struct_mutex); ret = -ENOMEM; goto out_free; } priv->is_master = 1; /* take another reference for the copy in the local file priv */ priv->master = drm_master_get(priv->minor->master); priv->authenticated = 1; mutex_unlock(&dev->struct_mutex); if (dev->driver->master_create) { ret = dev->driver->master_create(dev, priv->master); if (ret) { mutex_lock(&dev->struct_mutex); /* drop both references if this fails */ drm_master_put(&priv->minor->master); drm_master_put(&priv->master); mutex_unlock(&dev->struct_mutex); goto out_free; } } mutex_lock(&dev->struct_mutex); if (dev->driver->master_set) { ret = dev->driver->master_set(dev, priv, true); if (ret) { /* drop both references if this fails */ drm_master_put(&priv->minor->master); drm_master_put(&priv->master); mutex_unlock(&dev->struct_mutex); goto out_free; } } mutex_unlock(&dev->struct_mutex); } else { /* get a reference to the master */ priv->master = drm_master_get(priv->minor->master); mutex_unlock(&dev->struct_mutex); } mutex_lock(&dev->struct_mutex); list_add(&priv->lhead, &dev->filelist, (caddr_t)priv); mutex_unlock(&dev->struct_mutex); return 0; out_free: kfree(priv, sizeof (*priv)); return ret; } void drm_master_release(struct drm_device *dev, struct drm_file *fpriv) { struct drm_master *master = fpriv->master; if (drm_i_have_hw_lock(dev, fpriv)) { DRM_DEBUG("Process %d dead, freeing lock for context %d", DRM_CURRENTPID, _DRM_LOCKING_CONTEXT(master->lock.hw_lock->lock)); (void) drm_lock_free(&master->lock, _DRM_LOCKING_CONTEXT(master->lock.hw_lock->lock)); } } static void drm_events_release(struct drm_file *file_priv) { struct drm_device *dev = file_priv->minor->dev; struct drm_pending_event *e, *et; struct drm_pending_vblank_event *v, *vt; unsigned long flags; spin_lock_irqsave(&dev->event_lock, flags); /* Remove pending flips */ list_for_each_entry_safe(v, vt, struct drm_pending_vblank_event, &dev->vblank_event_list, base.link) if (v->base.file_priv == file_priv) { list_del(&v->base.link); drm_vblank_put(dev, v->pipe); v->base.destroy(&v->base, sizeof(struct drm_pending_vblank_event)); } /* Remove unconsumed events */ list_for_each_entry_safe(e, et, struct drm_pending_event, &file_priv->event_list, link) e->destroy(e, sizeof(struct drm_pending_vblank_event)); spin_unlock_irqrestore(&dev->event_lock, flags); } /** * Release file. * * \return zero on success or a negative number on failure. * * If the hardware lock is held then free it, and take it again for the kernel * context since it's necessary to reclaim buffers. Unlink the file private * data from its list and free it. Decreases the open count and if it reaches * zero calls drm_lastclose(). */ int drm_release(struct drm_file *file_priv) { struct drm_device *dev = file_priv->minor->dev; int retcode = 0; DRM_DEBUG("open_count = %d\n", dev->open_count); if (dev->driver->preclose) dev->driver->preclose(dev, file_priv); /* ======================================================== * Begin inline drm_release */ /* Release any auth tokens that might point to this file_priv, (do that under the drm_global_mutex) */ if (file_priv->magic) (void) drm_remove_magic(file_priv->master, file_priv->magic); /* if the master has gone away we can't do anything with the lock */ if (file_priv->minor->master) drm_master_release(dev, file_priv); if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) drm_core_reclaim_buffers(dev, file_priv); drm_events_release(file_priv); if (dev->driver->driver_features & DRIVER_MODESET) drm_fb_release(file_priv); if (dev->driver->driver_features & DRIVER_GEM) drm_gem_release(dev, file_priv); mutex_lock(&dev->ctxlist_mutex); if (!list_empty(&dev->ctxlist)) { struct drm_ctx_list *pos, *n; list_for_each_entry_safe(pos, n, struct drm_ctx_list, &dev->ctxlist, head) { if (pos->tag == file_priv && pos->handle != DRM_KERNEL_CONTEXT) { if (dev->driver->context_dtor) dev->driver->context_dtor(dev, pos->handle); drm_ctxbitmap_free(dev, pos->handle); list_del(&pos->head); kfree(pos, sizeof (*pos)); --dev->ctx_count; } } } mutex_unlock(&dev->ctxlist_mutex); mutex_lock(&dev->struct_mutex); if (file_priv->is_master) { struct drm_master *master = file_priv->master; struct drm_file *temp; list_for_each_entry(temp, struct drm_file, &dev->filelist, lhead) { if ((temp->master == file_priv->master) && (temp != file_priv)) temp->authenticated = 0; } /** * Since the master is disappearing, so is the * possibility to lock. */ if (master->lock.hw_lock) { master->lock.hw_lock = NULL; master->lock.file_priv = NULL; } if (file_priv->minor->master == file_priv->master) { /* drop the reference held my the minor */ if (dev->driver->master_drop) dev->driver->master_drop(dev, file_priv, true); drm_master_put(&file_priv->minor->master); } } /* drop the reference held my the file priv */ drm_master_put(&file_priv->master); file_priv->is_master = 0; list_del(&file_priv->lhead); mutex_unlock(&dev->struct_mutex); if (dev->driver->postclose) dev->driver->postclose(dev, file_priv); kfree(file_priv, sizeof (*file_priv)); /* ======================================================== * End inline drm_release */ atomic_inc(&dev->counts[_DRM_STAT_CLOSES]); spin_lock(&dev->count_lock); if (!--dev->open_count) { if (atomic_read(&dev->ioctl_count)) { DRM_ERROR("Device busy: %d\n", atomic_read(&dev->ioctl_count)); spin_unlock(&dev->count_lock); return -EBUSY; } spin_unlock(&dev->count_lock); return drm_lastclose(dev); } spin_unlock(&dev->count_lock); return retcode; } static bool drm_dequeue_event(struct drm_file *file_priv, size_t total, size_t max, struct drm_pending_event **out) { struct drm_device *dev = file_priv->minor->dev; struct drm_pending_event *e; unsigned long flags; bool ret = false; spin_lock_irqsave(&dev->event_lock, flags); *out = NULL; if (list_empty(&file_priv->event_list)) goto out; e = list_first_entry(&file_priv->event_list, struct drm_pending_event, link); if (e->event->length + total > max) goto out; file_priv->event_space += e->event->length; list_del(&e->link); *out = e; ret = true; out: spin_unlock_irqrestore(&dev->event_lock, flags); return ret; } ssize_t drm_read(struct drm_file *file_priv, struct uio *uiop) { struct drm_pending_event *e; size_t total; int ret = 0; DRM_WAIT(ret, &file_priv->event_wait, !list_empty(&file_priv->event_list)); if (ret < 0) { DRM_ERROR("returns %d event_list is %d", ret, list_empty(&file_priv->event_list)); return ret; } total = 0; while (drm_dequeue_event(file_priv, total, uiop->uio_iov->iov_len, &e)) { ret = uiomove((caddr_t)e->event, e->event->length, UIO_READ, uiop); if (ret) { DRM_ERROR("Failed to copy to user: %d", ret); return (0); } total += e->event->length; e->destroy(e, sizeof(struct drm_pending_vblank_event)); } return total; } short drm_poll(struct drm_file *file_priv, short events) { short revent = 0; if (!list_empty(&file_priv->event_list)) { if (events & POLLIN) revent |= POLLIN; if (events & POLLRDNORM) revent |= POLLRDNORM; } return revent; }