diff options
Diffstat (limited to 'linux-core')
| -rw-r--r-- | linux-core/drm_drv.c | 43 |
1 files changed, 42 insertions, 1 deletions
diff --git a/linux-core/drm_drv.c b/linux-core/drm_drv.c index 30a6b6e4..016f9195 100644 --- a/linux-core/drm_drv.c +++ b/linux-core/drm_drv.c @@ -88,6 +88,13 @@ #ifndef __HAVE_SG #define __HAVE_SG 0 #endif +/* __HAVE_KERNEL_CTX_SWITCH isn't used by any of the drm modules in + * the DRI cvs tree, but it is required by the kernel tree's sparc + * driver. + */ +#ifndef __HAVE_KERNEL_CTX_SWITCH +#define __HAVE_KERNEL_CTX_SWITCH 0 +#endif #ifndef __HAVE_DRIVER_FOPS_READ #define __HAVE_DRIVER_FOPS_READ 0 #endif @@ -1105,6 +1112,16 @@ int DRM(lock)( struct inode *inode, struct file *filp, DRIVER_DMA_QUIESCENT(); } #endif + /* __HAVE_KERNEL_CTX_SWITCH isn't used by any of the + * drm modules in the DRI cvs tree, but it is required + * by the Sparc driver. + */ +#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" ); @@ -1141,6 +1158,29 @@ int DRM(unlock)( struct inode *inode, struct file *filp, atomic_inc( &dev->counts[_DRM_STAT_UNLOCKS] ); + /* __HAVE_KERNEL_CTX_SWITCH isn't used by any of the drm + * modules in the DRI cvs tree, but it is required by the + * Sparc driver. + */ +#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 @@ -1149,8 +1189,9 @@ int DRM(unlock)( struct inode *inode, struct file *filp, if ( DRM(lock_free)( dev, &dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT ) ) { - DRM_ERROR( "\n" ); + DRM_ERROR( "\n" ); } +#endif /* !__HAVE_KERNEL_CTX_SWITCH */ unblock_all_signals(); return 0; |