diff options
Diffstat (limited to 'drivers/gpu/drm/drm_fops.c')
| -rw-r--r-- | drivers/gpu/drm/drm_fops.c | 475 |
1 files changed, 475 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c new file mode 100644 index 0000000..78eeed5 --- /dev/null +++ b/drivers/gpu/drm/drm_fops.c @@ -0,0 +1,475 @@ +/** + * \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 "drm_sarea.h" +#include <linux/poll.h> +#include <linux/smp_lock.h> + +static int drm_open_helper(struct inode *inode, struct file *filp, + struct drm_device * dev); + +static int drm_setup(struct drm_device * dev) +{ + drm_local_map_t *map; + int i; + int ret; + u32 sareapage; + + if (dev->driver->firstopen) { + ret = dev->driver->firstopen(dev); + if (ret != 0) + return ret; + } + + dev->magicfree.next = NULL; + + /* prebuild the SAREA */ + sareapage = max_t(unsigned, SAREA_MAX, PAGE_SIZE); + i = drm_addmap(dev, 0, sareapage, _DRM_SHM, _DRM_CONTAINS_LOCK, &map); + if (i != 0) + return i; + + 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 < ARRAY_SIZE(dev->counts); i++) + atomic_set(&dev->counts[i], 0); + + drm_ht_create(&dev->magiclist, DRM_MAGIC_HASH_ORDER); + INIT_LIST_HEAD(&dev->magicfree); + + dev->sigdata.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. + */ + + 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) +{ + struct drm_device *dev = NULL; + int minor_id = iminor(inode); + struct drm_minor *minor; + int retcode = 0; + + minor = idr_find(&drm_minors_idr, minor_id); + if (!minor) + return -ENODEV; + + if (!(dev = 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); + +/** + * File \c open operation. + * + * \param inode device inode. + * \param filp file pointer. + * + * Puts the dev->fops corresponding to the device minor number into + * \p filp, call the \c open method, and restore the file operations. + */ +int drm_stub_open(struct inode *inode, struct file *filp) +{ + struct drm_device *dev = NULL; + struct drm_minor *minor; + int minor_id = iminor(inode); + int err = -ENODEV; + const struct file_operations *old_fops; + + DRM_DEBUG("\n"); + + /* BKL pushdown: note that nothing else serializes idr_find() */ + lock_kernel(); + minor = idr_find(&drm_minors_idr, minor_id); + if (!minor) + goto out; + + if (!(dev = minor->dev)) + goto out; + + old_fops = filp->f_op; + filp->f_op = fops_get(&dev->driver->fops); + if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) { + fops_put(filp->f_op); + filp->f_op = fops_get(old_fops); + } + fops_put(old_fops); + +out: + unlock_kernel(); + return err; +} + +/** + * Check whether DRI will run on this CPU. + * + * \return non-zero if the DRI will run on this CPU, or zero otherwise. + */ +static int drm_cpu_valid(void) +{ +#if defined(__i386__) + if (boot_cpu_data.x86 == 3) + return 0; /* No cmpxchg on a 386 */ +#endif +#if defined(__sparc__) && !defined(__sparc_v9__) + return 0; /* No cmpxchg before v9 sparc. */ +#endif + return 1; +} + +/** + * 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, + struct drm_device * dev) +{ + int minor_id = iminor(inode); + struct drm_file *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", task_pid_nr(current), minor_id); + + priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES); + if (!priv) + return -ENOMEM; + + memset(priv, 0, sizeof(*priv)); + filp->private_data = priv; + priv->filp = filp; + priv->uid = current_euid(); + priv->pid = task_pid_nr(current); + priv->minor = idr_find(&drm_minors_idr, minor_id); + priv->ioctl_count = 0; + /* for compatibility root is always authenticated */ + priv->authenticated = capable(CAP_SYS_ADMIN); + priv->lock_count = 0; + + INIT_LIST_HEAD(&priv->lhead); + + 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; + } + + mutex_lock(&dev->struct_mutex); + if (list_empty(&dev->filelist)) + priv->master = 1; + + list_add(&priv->lhead, &dev->filelist); + mutex_unlock(&dev->struct_mutex); + +#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_fasync(int fd, struct file *filp, int on) +{ + struct drm_file *priv = filp->private_data; + struct drm_device *dev = priv->minor->dev; + int retcode; + + DRM_DEBUG("fd = %d, device = 0x%lx\n", fd, + (long)old_encode_dev(priv->minor->device)); + retcode = fasync_helper(fd, filp, on, &dev->buf_async); + if (retcode < 0) + return retcode; + return 0; +} +EXPORT_SYMBOL(drm_fasync); + +/** + * Release file. + * + * \param inode device inode + * \param file_priv DRM file private. + * \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 inode *inode, struct file *filp) +{ + struct drm_file *file_priv = filp->private_data; + struct drm_device *dev = file_priv->minor->dev; + int retcode = 0; + + lock_kernel(); + + DRM_DEBUG("open_count = %d\n", dev->open_count); + + if (dev->driver->preclose) + dev->driver->preclose(dev, file_priv); + + /* ======================================================== + * Begin inline drm_release + */ + + DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", + task_pid_nr(current), + (long)old_encode_dev(file_priv->minor->device), + dev->open_count); + + if (dev->driver->reclaim_buffers_locked && dev->lock.hw_lock) { + if (drm_i_have_hw_lock(dev, file_priv)) { + dev->driver->reclaim_buffers_locked(dev, file_priv); + } else { + unsigned long endtime = jiffies + 3 * DRM_HZ; + int locked = 0; + + drm_idlelock_take(&dev->lock); + + /* + * Wait for a while. + */ + + do{ + spin_lock_bh(&dev->lock.spinlock); + locked = dev->lock.idle_has_lock; + spin_unlock_bh(&dev->lock.spinlock); + if (locked) + break; + schedule(); + } while (!time_after_eq(jiffies, endtime)); + + if (!locked) { + DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n" + "\tdriver to use reclaim_buffers_idlelocked() instead.\n" + "\tI will go on reclaiming the buffers anyway.\n"); + } + + dev->driver->reclaim_buffers_locked(dev, file_priv); + drm_idlelock_release(&dev->lock); + } + } + + if (dev->driver->reclaim_buffers_idlelocked && dev->lock.hw_lock) { + + drm_idlelock_take(&dev->lock); + dev->driver->reclaim_buffers_idlelocked(dev, file_priv); + drm_idlelock_release(&dev->lock); + + } + + if (drm_i_have_hw_lock(dev, file_priv)) { + DRM_DEBUG("File %p released, freeing lock for context %d\n", + filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); + + drm_lock_free(&dev->lock, + _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); + } + + + if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && + !dev->driver->reclaim_buffers_locked) { + dev->driver->reclaim_buffers(dev, 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, &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); + drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST); + --dev->ctx_count; + } + } + } + mutex_unlock(&dev->ctxlist_mutex); + + mutex_lock(&dev->struct_mutex); + if (file_priv->remove_auth_on_close == 1) { + struct drm_file *temp; + + list_for_each_entry(temp, &dev->filelist, lhead) + temp->authenticated = 0; + } + list_del(&file_priv->lhead); + mutex_unlock(&dev->struct_mutex); + + if (dev->driver->postclose) + dev->driver->postclose(dev, file_priv); + drm_free(file_priv, sizeof(*file_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_lastclose(dev); + } + spin_unlock(&dev->count_lock); + + unlock_kernel(); + + return retcode; +} +EXPORT_SYMBOL(drm_release); + +/** No-op. */ +unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) +{ + return 0; +} +EXPORT_SYMBOL(drm_poll); |
