1 files changed, 462 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
new file mode 100644
index 000000000000..089c015c01d1
--- /dev/null
+++ b/drivers/gpu/drm/drm_irq.c
@@ -0,0 +1,462 @@
+/**
+ * \file drm_irq.c
+ * IRQ support
+ *
+ * \author Rickard E. (Rik) Faith <faith@valinux.com>
+ * \author Gareth Hughes <gareth@valinux.com>
+ */
+
+/*
+ * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
+ *
+ * Copyright 1999, 2000 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/interrupt.h>    /* For task queue support */
+
+/**
+ * Get interrupt from bus id.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg user argument, pointing to a drm_irq_busid structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Finds the PCI device with the specified bus id and gets its IRQ number.
+ * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
+ * to that of the device that this DRM instance attached to.
+ */
+int drm_irq_by_busid(struct drm_device *dev, void *data,
+                     struct drm_file *file_priv)
+{
+        struct drm_irq_busid *p = data;
+
+        if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
+                return -EINVAL;
+
+        if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
+            (p->busnum & 0xff) != dev->pdev->bus->number ||
+            p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
+                return -EINVAL;
+
+        p->irq = dev->irq;
+
+        DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
+                  p->irq);
+
+        return 0;
+}
+
+/**
+ * Install IRQ handler.
+ *
+ * \param dev DRM device.
+ * \param irq IRQ number.
+ *
+ * Initializes the IRQ related data, and setups drm_device::vbl_queue. Installs the handler, calling the driver
+ * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions
+ * before and after the installation.
+ */
+static int drm_irq_install(struct drm_device * dev)
+{
+        int ret;
+        unsigned long sh_flags = 0;
+
+        if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
+                return -EINVAL;
+
+        if (dev->irq == 0)
+                return -EINVAL;
+
+        mutex_lock(&dev->struct_mutex);
+
+        /* Driver must have been initialized */
+        if (!dev->dev_private) {
+                mutex_unlock(&dev->struct_mutex);
+                return -EINVAL;
+        }
+
+        if (dev->irq_enabled) {
+                mutex_unlock(&dev->struct_mutex);
+                return -EBUSY;
+        }
+        dev->irq_enabled = 1;
+        mutex_unlock(&dev->struct_mutex);
+
+        DRM_DEBUG("irq=%d\n", dev->irq);
+
+        if (drm_core_check_feature(dev, DRIVER_IRQ_VBL)) {
+                init_waitqueue_head(&dev->vbl_queue);
+
+                spin_lock_init(&dev->vbl_lock);
+
+                INIT_LIST_HEAD(&dev->vbl_sigs);
+                INIT_LIST_HEAD(&dev->vbl_sigs2);
+
+                dev->vbl_pending = 0;
+        }
+
+        /* Before installing handler */
+        dev->driver->irq_preinstall(dev);
+
+        /* Install handler */
+        if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
+                sh_flags = IRQF_SHARED;
+
+        ret = request_irq(dev->irq, dev->driver->irq_handler,
+                          sh_flags, dev->devname, dev);
+        if (ret < 0) {
+                mutex_lock(&dev->struct_mutex);
+                dev->irq_enabled = 0;
+                mutex_unlock(&dev->struct_mutex);
+                return ret;
+        }
+
+        /* After installing handler */
+        dev->driver->irq_postinstall(dev);
+
+        return 0;
+}
+
+/**
+ * Uninstall the IRQ handler.
+ *
+ * \param dev DRM device.
+ *
+ * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
+ */
+int drm_irq_uninstall(struct drm_device * dev)
+{
+        int irq_enabled;
+
+        if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
+                return -EINVAL;
+
+        mutex_lock(&dev->struct_mutex);
+        irq_enabled = dev->irq_enabled;
+        dev->irq_enabled = 0;
+        mutex_unlock(&dev->struct_mutex);
+
+        if (!irq_enabled)
+                return -EINVAL;
+
+        DRM_DEBUG("irq=%d\n", dev->irq);
+
+        dev->driver->irq_uninstall(dev);
+
+        free_irq(dev->irq, dev);
+
+        dev->locked_tasklet_func = NULL;
+
+        return 0;
+}
+
+EXPORT_SYMBOL(drm_irq_uninstall);
+
+/**
+ * IRQ control ioctl.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg user argument, pointing to a drm_control structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Calls irq_install() or irq_uninstall() according to \p arg.
+ */
+int drm_control(struct drm_device *dev, void *data,
+                struct drm_file *file_priv)
+{
+        struct drm_control *ctl = data;
+
+        /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
+
+
+        switch (ctl->func) {
+        case DRM_INST_HANDLER:
+                if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
+                        return 0;
+                if (dev->if_version < DRM_IF_VERSION(1, 2) &&
+                    ctl->irq != dev->irq)
+                        return -EINVAL;
+                return drm_irq_install(dev);
+        case DRM_UNINST_HANDLER:
+                if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
+                        return 0;
+                return drm_irq_uninstall(dev);
+        default:
+                return -EINVAL;
+        }
+}
+
+/**
+ * Wait for VBLANK.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param data user argument, pointing to a drm_wait_vblank structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Verifies the IRQ is installed.
+ *
+ * If a signal is requested checks if this task has already scheduled the same signal
+ * for the same vblank sequence number - nothing to be done in
+ * that case. If the number of tasks waiting for the interrupt exceeds 100 the
+ * function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
+ * task.
+ *
+ * If a signal is not requested, then calls vblank_wait().
+ */
+int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_priv)
+{
+        union drm_wait_vblank *vblwait = data;
+        struct timeval now;
+        int ret = 0;
+        unsigned int flags, seq;
+
+        if ((!dev->irq) || (!dev->irq_enabled))
+                return -EINVAL;
+
+        if (vblwait->request.type &
+            ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
+                DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
+                          vblwait->request.type,
+                          (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
+                return -EINVAL;
+        }
+
+        flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
+
+        if (!drm_core_check_feature(dev, (flags & _DRM_VBLANK_SECONDARY) ?
+                                    DRIVER_IRQ_VBL2 : DRIVER_IRQ_VBL))
+                return -EINVAL;
+
+        seq = atomic_read((flags & _DRM_VBLANK_SECONDARY) ? &dev->vbl_received2
+                          : &dev->vbl_received);
+
+        switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
+        case _DRM_VBLANK_RELATIVE:
+                vblwait->request.sequence += seq;
+                vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
+        case _DRM_VBLANK_ABSOLUTE:
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        if ((flags & _DRM_VBLANK_NEXTONMISS) &&
+            (seq - vblwait->request.sequence) <= (1<<23)) {
+                vblwait->request.sequence = seq + 1;
+        }
+
+        if (flags & _DRM_VBLANK_SIGNAL) {
+                unsigned long irqflags;
+                struct list_head *vbl_sigs = (flags & _DRM_VBLANK_SECONDARY)
+                                      ? &dev->vbl_sigs2 : &dev->vbl_sigs;
+                struct drm_vbl_sig *vbl_sig;
+
+                spin_lock_irqsave(&dev->vbl_lock, irqflags);
+
+                /* Check if this task has already scheduled the same signal
+                 * for the same vblank sequence number; nothing to be done in
+                 * that case
+                 */
+                list_for_each_entry(vbl_sig, vbl_sigs, head) {
+                        if (vbl_sig->sequence == vblwait->request.sequence
+                            && vbl_sig->info.si_signo ==
+                            vblwait->request.signal
+                            && vbl_sig->task == current) {
+                                spin_unlock_irqrestore(&dev->vbl_lock,
+                                                       irqflags);
+                                vblwait->reply.sequence = seq;
+                                goto done;
+                        }
+                }
+
+                if (dev->vbl_pending >= 100) {
+                        spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
+                        return -EBUSY;
+                }
+
+                dev->vbl_pending++;
+
+                spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
+
+                if (!
+                    (vbl_sig =
+                     drm_alloc(sizeof(struct drm_vbl_sig), DRM_MEM_DRIVER))) {
+                        return -ENOMEM;
+                }
+
+                memset((void *)vbl_sig, 0, sizeof(*vbl_sig));
+
+                vbl_sig->sequence = vblwait->request.sequence;
+                vbl_sig->info.si_signo = vblwait->request.signal;
+                vbl_sig->task = current;
+
+                spin_lock_irqsave(&dev->vbl_lock, irqflags);
+
+                list_add_tail(&vbl_sig->head, vbl_sigs);
+
+                spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
+
+                vblwait->reply.sequence = seq;
+        } else {
+                if (flags & _DRM_VBLANK_SECONDARY) {
+                        if (dev->driver->vblank_wait2)
+                                ret = dev->driver->vblank_wait2(dev, &vblwait->request.sequence);
+                } else if (dev->driver->vblank_wait)
+                        ret =
+                            dev->driver->vblank_wait(dev,
+                                                     &vblwait->request.sequence);
+
+                do_gettimeofday(&now);
+                vblwait->reply.tval_sec = now.tv_sec;
+                vblwait->reply.tval_usec = now.tv_usec;
+        }
+
+      done:
+        return ret;
+}
+
+/**
+ * Send the VBLANK signals.
+ *
+ * \param dev DRM device.
+ *
+ * Sends a signal for each task in drm_device::vbl_sigs and empties the list.
+ *
+ * If a signal is not requested, then calls vblank_wait().
+ */
+void drm_vbl_send_signals(struct drm_device * dev)
+{
+        unsigned long flags;
+        int i;
+
+        spin_lock_irqsave(&dev->vbl_lock, flags);
+
+        for (i = 0; i < 2; i++) {
+                struct drm_vbl_sig *vbl_sig, *tmp;
+                struct list_head *vbl_sigs = i ? &dev->vbl_sigs2 : &dev->vbl_sigs;
+                unsigned int vbl_seq = atomic_read(i ? &dev->vbl_received2 :
+                                                   &dev->vbl_received);
+
+                list_for_each_entry_safe(vbl_sig, tmp, vbl_sigs, head) {
+                        if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) {
+                                vbl_sig->info.si_code = vbl_seq;
+                                send_sig_info(vbl_sig->info.si_signo,
+                                              &vbl_sig->info, vbl_sig->task);
+
+                                list_del(&vbl_sig->head);
+
+                                drm_free(vbl_sig, sizeof(*vbl_sig),
+                                         DRM_MEM_DRIVER);
+
+                                dev->vbl_pending--;
+                        }
+                }
+        }
+
+        spin_unlock_irqrestore(&dev->vbl_lock, flags);
+}
+
+EXPORT_SYMBOL(drm_vbl_send_signals);
+
+/**
+ * Tasklet wrapper function.
+ *
+ * \param data DRM device in disguise.
+ *
+ * Attempts to grab the HW lock and calls the driver callback on success. On
+ * failure, leave the lock marked as contended so the callback can be called
+ * from drm_unlock().
+ */
+static void drm_locked_tasklet_func(unsigned long data)
+{
+        struct drm_device *dev = (struct drm_device *)data;
+        unsigned long irqflags;
+
+        spin_lock_irqsave(&dev->tasklet_lock, irqflags);
+
+        if (!dev->locked_tasklet_func ||
+            !drm_lock_take(&dev->lock,
+                           DRM_KERNEL_CONTEXT)) {
+                spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
+                return;
+        }
+
+        dev->lock.lock_time = jiffies;
+        atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
+
+        dev->locked_tasklet_func(dev);
+
+        drm_lock_free(&dev->lock,
+                      DRM_KERNEL_CONTEXT);
+
+        dev->locked_tasklet_func = NULL;
+
+        spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
+}
+
+/**
+ * Schedule a tasklet to call back a driver hook with the HW lock held.
+ *
+ * \param dev DRM device.
+ * \param func Driver callback.
+ *
+ * This is intended for triggering actions that require the HW lock from an
+ * interrupt handler. The lock will be grabbed ASAP after the interrupt handler
+ * completes. Note that the callback may be called from interrupt or process
+ * context, it must not make any assumptions about this. Also, the HW lock will
+ * be held with the kernel context or any client context.
+ */
+void drm_locked_tasklet(struct drm_device *dev, void (*func)(struct drm_device *))
+{
+        unsigned long irqflags;
+        static DECLARE_TASKLET(drm_tasklet, drm_locked_tasklet_func, 0);
+
+        if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ) ||
+            test_bit(TASKLET_STATE_SCHED, &drm_tasklet.state))
+                return;
+
+        spin_lock_irqsave(&dev->tasklet_lock, irqflags);
+
+        if (dev->locked_tasklet_func) {
+                spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
+                return;
+        }
+
+        dev->locked_tasklet_func = func;
+
+        spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
+
+        drm_tasklet.data = (unsigned long)dev;
+
+        tasklet_hi_schedule(&drm_tasklet);
+}
+EXPORT_SYMBOL(drm_locked_tasklet);