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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/char/drm/drm_irq.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/char/drm/drm_irq.c')
-rw-r--r-- | drivers/char/drm/drm_irq.c | 370 |
1 files changed, 370 insertions, 0 deletions
diff --git a/drivers/char/drm/drm_irq.c b/drivers/char/drm/drm_irq.c new file mode 100644 index 000000000000..2e236ebcf27b --- /dev/null +++ b/drivers/char/drm/drm_irq.c @@ -0,0 +1,370 @@ +/** + * \file drm_irq.h + * 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) != dev->pci_domain || + (p.busnum & 0xff) != dev->pci_bus || + p.devnum != dev->pci_slot || + p.funcnum != dev->pci_func) + 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. + */ +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; + + down( &dev->struct_sem ); + + /* Driver must have been initialized */ + if ( !dev->dev_private ) { + up( &dev->struct_sem ); + return -EINVAL; + } + + if ( dev->irq_enabled ) { + up( &dev->struct_sem ); + return -EBUSY; + } + dev->irq_enabled = 1; + up( &dev->struct_sem ); + + 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.head ); + + 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 = SA_SHIRQ; + + ret = request_irq( dev->irq, dev->driver->irq_handler, + sh_flags, dev->devname, dev ); + if ( ret < 0 ) { + down( &dev->struct_sem ); + dev->irq_enabled = 0; + up( &dev->struct_sem ); + 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; + + down( &dev->struct_sem ); + irq_enabled = dev->irq_enabled; + dev->irq_enabled = 0; + up( &dev->struct_sem ); + + if ( !irq_enabled ) + return -EINVAL; + + DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, dev->irq ); + + dev->driver->irq_uninstall(dev); + + free_irq( dev->irq, dev ); + + 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; + + if (!drm_core_check_feature(dev, DRIVER_IRQ_VBL)) + return -EINVAL; + + if (!dev->irq) + return -EINVAL; + + DRM_COPY_FROM_USER_IOCTL( vblwait, argp, sizeof(vblwait) ); + + switch ( vblwait.request.type & ~_DRM_VBLANK_FLAGS_MASK ) { + case _DRM_VBLANK_RELATIVE: + vblwait.request.sequence += atomic_read( &dev->vbl_received ); + vblwait.request.type &= ~_DRM_VBLANK_RELATIVE; + case _DRM_VBLANK_ABSOLUTE: + break; + default: + return -EINVAL; + } + + flags = vblwait.request.type & _DRM_VBLANK_FLAGS_MASK; + + if ( flags & _DRM_VBLANK_SIGNAL ) { + unsigned long irqflags; + drm_vbl_sig_t *vbl_sig; + + vblwait.reply.sequence = atomic_read( &dev->vbl_received ); + + 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, &dev->vbl_sigs.head, 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 ); + 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( (struct list_head *) vbl_sig, &dev->vbl_sigs.head ); + + spin_unlock_irqrestore( &dev->vbl_lock, irqflags ); + } 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: + DRM_COPY_TO_USER_IOCTL( argp, vblwait, sizeof(vblwait) ); + + 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 ) +{ + struct list_head *list, *tmp; + drm_vbl_sig_t *vbl_sig; + unsigned int vbl_seq = atomic_read( &dev->vbl_received ); + unsigned long flags; + + spin_lock_irqsave( &dev->vbl_lock, flags ); + + list_for_each_safe( list, tmp, &dev->vbl_sigs.head ) { + vbl_sig = list_entry( list, drm_vbl_sig_t, 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( list ); + + 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); + + |