| /** |
| * \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 filp file pointer. |
| * \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 inode *inode, struct file *filp, |
| unsigned int cmd, unsigned long arg) |
| { |
| drm_file_t *priv = filp->private_data; |
| drm_device_t *dev = priv->head->dev; |
| drm_irq_busid_t __user *argp = (void __user *)arg; |
| drm_irq_busid_t p; |
| |
| if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
| return -EINVAL; |
| |
| if (copy_from_user(&p, argp, sizeof(p))) |
| return -EFAULT; |
| |
| 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); |
| if (copy_to_user(argp, &p, sizeof(p))) |
| return -EFAULT; |
| 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(drm_device_t * 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("%s: irq=%d\n", __FUNCTION__, 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(drm_device_t * 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("%s: irq=%d\n", __FUNCTION__, 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 filp file pointer. |
| * \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 inode *inode, struct file *filp, |
| unsigned int cmd, unsigned long arg) |
| { |
| drm_file_t *priv = filp->private_data; |
| drm_device_t *dev = priv->head->dev; |
| drm_control_t ctl; |
| |
| /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */ |
| |
| if (copy_from_user(&ctl, (drm_control_t __user *) arg, sizeof(ctl))) |
| return -EFAULT; |
| |
| 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 filp file pointer. |
| * \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(DRM_IOCTL_ARGS) |
| { |
| drm_file_t *priv = filp->private_data; |
| drm_device_t *dev = priv->head->dev; |
| drm_wait_vblank_t __user *argp = (void __user *)data; |
| drm_wait_vblank_t vblwait; |
| struct timeval now; |
| int ret = 0; |
| unsigned int flags, seq; |
| |
| if (!dev->irq) |
| return -EINVAL; |
| |
| if (copy_from_user(&vblwait, argp, sizeof(vblwait))) |
| return -EFAULT; |
| |
| 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; |
| drm_vbl_sig_t *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(drm_vbl_sig_t), 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: |
| if (copy_to_user(argp, &vblwait, sizeof(vblwait))) |
| return -EFAULT; |
| |
| 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(drm_device_t * dev) |
| { |
| unsigned long flags; |
| int i; |
| |
| spin_lock_irqsave(&dev->vbl_lock, flags); |
| |
| for (i = 0; i < 2; i++) { |
| drm_vbl_sig_t *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) |
| { |
| drm_device_t *dev = (drm_device_t*)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(drm_device_t *dev, void (*func)(drm_device_t*)) |
| { |
| 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); |