1 files changed, 471 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
new file mode 100644
index 000000000000..851a53f1acce
--- /dev/null
+++ b/drivers/gpu/drm/drm_fops.c
@@ -0,0 +1,471 @@
+/**
+ * \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->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);