diff options
Diffstat (limited to 'linux-core/drm_drv.c')
| -rw-r--r-- | linux-core/drm_drv.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/linux-core/drm_drv.c b/linux-core/drm_drv.c index 4a15faec..2d1a9448 100644 --- a/linux-core/drm_drv.c +++ b/linux-core/drm_drv.c @@ -84,6 +84,9 @@ #ifndef __HAVE_SG #define __HAVE_SG 0 #endif +#ifndef __HAVE_KERNEL_CTX_SWITCH +#define __HAVE_KERNEL_CTX_SWITCH 0 +#endif #ifndef __HAVE_DRIVER_FOPS_READ #define __HAVE_DRIVER_FOPS_READ 0 #endif @@ -1015,6 +1018,12 @@ int DRM(lock)( struct inode *inode, struct file *filp, DRIVER_DMA_QUIESCENT(); } #endif +#if __HAVE_KERNEL_CTX_SWITCH + if ( dev->last_context != lock.context ) { + DRM(context_switch)(dev, dev->last_context, + lock.context); + } +#endif } DRM_DEBUG( "%d %s\n", lock.context, ret ? "interrupted" : "has lock" ); @@ -1041,6 +1050,25 @@ int DRM(unlock)( struct inode *inode, struct file *filp, atomic_inc( &dev->counts[_DRM_STAT_UNLOCKS] ); +#if __HAVE_KERNEL_CTX_SWITCH + /* We no longer really hold it, but if we are the next + * agent to request it then we should just be able to + * take it immediately and not eat the ioctl. + */ + dev->lock.filp = 0; + { + __volatile__ unsigned int *plock = &dev->lock.hw_lock->lock; + unsigned int old, new, prev, ctx; + + ctx = lock.context; + do { + old = *plock; + new = ctx; + prev = cmpxchg(plock, old, new); + } while (prev != old); + } + wake_up_interruptible(&dev->lock.lock_queue); +#else DRM(lock_transfer)( dev, &dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT ); #if __HAVE_DMA_SCHEDULE @@ -1055,6 +1083,7 @@ int DRM(unlock)( struct inode *inode, struct file *filp, DRM_ERROR( "\n" ); } } +#endif /* !__HAVE_KERNEL_CTX_SWITCH */ unblock_all_signals(); return 0; |