/** * \file drm_fops.c * File operations for DRM * * \author Rickard E. (Rik) Faith <faith@valinux.com> * \author Daryll Strauss <daryll@valinux.com> * \author Gareth Hughes <gareth@valinux.com> */ /* * 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. * 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" #include <linux/poll.h> static int drm_open_helper(struct inode *inode, struct file *filp, drm_device_t * dev); static int drm_setup(drm_device_t * dev) { int i; int ret; if (dev->driver->presetup) { ret = dev->driver->presetup(dev); if (ret != 0) return ret; } atomic_set(&dev->ioctl_count, 0); atomic_set(&dev->vma_count, 0); dev->buf_use = 0; atomic_set(&dev->buf_alloc, 0); if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) { 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); for (i = 0; i < DRM_HASH_SIZE; i++) { dev->magiclist[i].head = NULL; dev->magiclist[i].tail = NULL; } dev->ctxlist = drm_alloc(sizeof(*dev->ctxlist), DRM_MEM_CTXLIST); if (dev->ctxlist == NULL) return -ENOMEM; memset(dev->ctxlist, 0, sizeof(*dev->ctxlist)); INIT_LIST_HEAD(&dev->ctxlist->head); dev->vmalist = NULL; dev->sigdata.lock = dev->lock.hw_lock = NULL; init_waitqueue_head(&dev->lock.lock_queue); dev->queue_count = 0; dev->queue_reserved = 0; dev->queue_slots = 0; dev->queuelist = NULL; dev->irq_enabled = 0; dev->context_flag = 0; dev->interrupt_flag = 0; dev->dma_flag = 0; dev->last_context = 0; dev->last_switch = 0; dev->last_checked = 0; init_waitqueue_head(&dev->context_wait); dev->if_version = 0; dev->ctx_start = 0; dev->lck_start = 0; dev->buf_async = NULL; init_waitqueue_head(&dev->buf_readers); init_waitqueue_head(&dev->buf_writers); 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. */ if (dev->driver->postsetup) dev->driver->postsetup(dev); return 0; } /** * Open file. * * \param inode device inode * \param filp file pointer. * \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 inode *inode, struct file *filp) { drm_device_t *dev = NULL; int minor = iminor(inode); int retcode = 0; if (!((minor >= 0) && (minor < drm_cards_limit))) return -ENODEV; if (!drm_heads[minor]) return -ENODEV; if (!(dev = drm_heads[minor]->dev)) return -ENODEV; retcode = drm_open_helper(inode, filp, dev); if (!retcode) { atomic_inc(&dev->counts[_DRM_STAT_OPENS]); spin_lock(&dev->count_lock); if (!dev->open_count++) { spin_unlock(&dev->count_lock); return drm_setup(dev); } spin_unlock(&dev->count_lock); } return retcode; } EXPORT_SYMBOL(drm_open); /** * Release file. * * \param inode device inode * \param filp file pointer. * \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 takedown(). */ int drm_release(struct inode *inode, struct file *filp) { drm_file_t *priv = filp->private_data; drm_device_t *dev; int retcode = 0; lock_kernel(); dev = priv->head->dev; DRM_DEBUG("open_count = %d\n", dev->open_count); if (dev->driver->prerelease) dev->driver->prerelease(dev, filp); /* ======================================================== * Begin inline drm_release */ DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", current->pid, (long)old_encode_dev(priv->head->device), dev->open_count); if (priv->lock_count && dev->lock.hw_lock && _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) && dev->lock.filp == filp) { DRM_DEBUG("File %p released, freeing lock for context %d\n", filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); if (dev->driver->release) dev->driver->release(dev, filp); drm_lock_free(dev, &dev->lock.hw_lock->lock, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); /* FIXME: may require heavy-handed reset of hardware at this point, possibly processed via a callback to the X server. */ } else if (dev->driver->release && priv->lock_count && dev->lock.hw_lock) { /* The lock is required to reclaim buffers */ DECLARE_WAITQUEUE(entry, current); add_wait_queue(&dev->lock.lock_queue, &entry); for (;;) { __set_current_state(TASK_INTERRUPTIBLE); if (!dev->lock.hw_lock) { /* Device has been unregistered */ retcode = -EINTR; break; } if (drm_lock_take(&dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT)) { dev->lock.filp = filp; dev->lock.lock_time = jiffies; atomic_inc(&dev->counts[_DRM_STAT_LOCKS]); break; /* Got lock */ } /* Contention */ schedule(); if (signal_pending(current)) { retcode = -ERESTARTSYS; break; } } __set_current_state(TASK_RUNNING); remove_wait_queue(&dev->lock.lock_queue, &entry); if (!retcode) { if (dev->driver->release) dev->driver->release(dev, filp); drm_lock_free(dev, &dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT); } } if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && !dev->driver->release) { dev->driver->reclaim_buffers(dev, filp); } drm_fasync(-1, filp, 0); down(&dev->ctxlist_sem); if (dev->ctxlist && (!list_empty(&dev->ctxlist->head))) { drm_ctx_list_t *pos, *n; list_for_each_entry_safe(pos, n, &dev->ctxlist->head, head) { if (pos->tag == 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); drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST); --dev->ctx_count; } } } up(&dev->ctxlist_sem); down(&dev->struct_sem); if (priv->remove_auth_on_close == 1) { drm_file_t *temp = dev->file_first; while (temp) { temp->authenticated = 0; temp = temp->next; } } if (priv->prev) { priv->prev->next = priv->next; } else { dev->file_first = priv->next; } if (priv->next) { priv->next->prev = priv->prev; } else { dev->file_last = priv->prev; } up(&dev->struct_sem); if (dev->driver->free_filp_priv) dev->driver->free_filp_priv(dev, priv); drm_free(priv, sizeof(*priv), DRM_MEM_FILES); /* ======================================================== * 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) || dev->blocked) { DRM_ERROR("Device busy: %d %d\n", atomic_read(&dev->ioctl_count), dev->blocked); spin_unlock(&dev->count_lock); unlock_kernel(); return -EBUSY; } spin_unlock(&dev->count_lock); unlock_kernel(); return drm_takedown(dev); } spin_unlock(&dev->count_lock); unlock_kernel(); return retcode; } EXPORT_SYMBOL(drm_release); /** * Called whenever a process opens /dev/drm. * * \param inode device inode. * \param filp file pointer. * \param dev device. * \return zero on success or a negative number on failure. * * 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 inode *inode, struct file *filp, drm_device_t * dev) { int minor = iminor(inode); drm_file_t *priv; int ret; if (filp->f_flags & O_EXCL) return -EBUSY; /* No exclusive opens */ if (!drm_cpu_valid()) return -EINVAL; DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor); priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES); if (!priv) return -ENOMEM; memset(priv, 0, sizeof(*priv)); filp->private_data = priv; priv->uid = current->euid; priv->pid = current->pid; priv->minor = minor; priv->head = drm_heads[minor]; priv->ioctl_count = 0; priv->authenticated = capable(CAP_SYS_ADMIN); priv->lock_count = 0; if (dev->driver->open_helper) { ret = dev->driver->open_helper(dev, priv); if (ret < 0) goto out_free; } down(&dev->struct_sem); if (!dev->file_last) { priv->next = NULL; priv->prev = NULL; dev->file_first = priv; dev->file_last = priv; } else { priv->next = NULL; priv->prev = dev->file_last; dev->file_last->next = priv; dev->file_last = priv; } up(&dev->struct_sem); #ifdef __alpha__ /* * Default the hose */ if (!dev->hose) { struct pci_dev *pci_dev; pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); if (pci_dev) { dev->hose = pci_dev->sysdata; pci_dev_put(pci_dev); } if (!dev->hose) { struct pci_bus *b = pci_bus_b(pci_root_buses.next); if (b) dev->hose = b->sysdata; } } #endif return 0; out_free: drm_free(priv, sizeof(*priv), DRM_MEM_FILES); filp->private_data = NULL; return ret; } /** No-op. */ int drm_flush(struct file *filp) { drm_file_t *priv = filp->private_data; drm_device_t *dev = priv->head->dev; DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", current->pid, (long)old_encode_dev(priv->head->device), dev->open_count); return 0; } EXPORT_SYMBOL(drm_flush); /** No-op. */ int drm_fasync(int fd, struct file *filp, int on) { drm_file_t *priv = filp->private_data; drm_device_t *dev = priv->head->dev; int retcode; DRM_DEBUG("fd = %d, device = 0x%lx\n", fd, (long)old_encode_dev(priv->head->device)); retcode = fasync_helper(fd, filp, on, &dev->buf_async); if (retcode < 0) return retcode; return 0; } EXPORT_SYMBOL(drm_fasync); /** No-op. */ unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) { return 0; } EXPORT_SYMBOL(drm_poll);