--- /dev/null
- return -ENODEV;
+/**
+ * \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)
- return -ENODEV;
++ 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->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);
+ }
+
+ drm_fasync(-1, filp, 0);
+
+ 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);
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff