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authorEric Anholt <anholt@freebsd.org>2003-10-19 23:35:58 +0000
committerEric Anholt <anholt@freebsd.org>2003-10-19 23:35:58 +0000
commit0cf1887139eb1ce18d09f7be0567aa93d802040d (patch)
tree05704a5a90bc9b0fbabed4029f200f9eff955953 /bsd-core/drmP.h
parent59fbe01fea8f77fc3810643c14a1738d197d4291 (diff)
- SMPng lock the DRM. This is only partial -- there are a few code paths
used by root (the X Server) which are not locked. However, it should deal with lost-IRQ issues on -current which I think people have been experiencing but I am unable to reproduce (though I understand why they would occur, because of a bug of mine). Note that most of the locking (DRM_LOCK()/UNLOCK()) is all covered by Giant still, so it doesn't matter yet. - Remove locking on FreeBSD-stable and NetBSD. These are covered by the fact that there is no reentrancy of the kernel except by interrupts, which are locked using spldrm()/splx() instead.
Diffstat (limited to 'bsd-core/drmP.h')
-rw-r--r--bsd-core/drmP.h37
1 files changed, 20 insertions, 17 deletions
diff --git a/bsd-core/drmP.h b/bsd-core/drmP.h
index c39df162..67915374 100644
--- a/bsd-core/drmP.h
+++ b/bsd-core/drmP.h
@@ -180,7 +180,6 @@ typedef struct drm_freelist {
int low_mark; /* Low water mark */
int high_mark; /* High water mark */
- DRM_SPINTYPE lock;
} drm_freelist_t;
typedef struct drm_buf_entry {
@@ -216,10 +215,17 @@ struct drm_file {
typedef struct drm_lock_data {
drm_hw_lock_t *hw_lock; /* Hardware lock */
DRMFILE filp; /* Unique identifier of holding process (NULL is kernel)*/
- wait_queue_head_t lock_queue; /* Queue of blocked processes */
+ int lock_queue; /* Queue of blocked processes */
unsigned long lock_time; /* Time of last lock in jiffies */
} drm_lock_data_t;
+/* This structure, in the drm_device_t, is always initialized while the device
+ * is open. dev->dma_lock protects the incrementing of dev->buf_use, which
+ * when set marks that no further bufs may be allocated until device teardown
+ * occurs (when the last open of the device has closed). The high/low
+ * watermarks of bufs are only touched by the X Server, and thus not
+ * concurrently accessed, so no locking is needed.
+ */
typedef struct drm_device_dma {
drm_buf_entry_t bufs[DRM_MAX_ORDER+1];
int buf_count;
@@ -311,8 +317,15 @@ struct drm_device {
int flags; /* Flags to open(2) */
/* Locks */
- DRM_SPINTYPE count_lock; /* For open_count, buf_use, buf_alloc */
- struct lock dev_lock; /* For others */
+#if defined(__FreeBSD__) && __FreeBSD_version > 500000
+#if __HAVE_DMA
+ struct mtx dma_lock; /* protects dev->dma */
+#endif
+#if __HAVE_IRQ
+ struct mtx irq_lock; /* protects irq condition checks */
+#endif
+ struct mtx dev_lock; /* protects everything else */
+#endif
/* Usage Counters */
int open_count; /* Outstanding files open */
int buf_use; /* Buffers in use -- cannot alloc */
@@ -327,8 +340,8 @@ struct drm_device {
drm_file_list_t files;
drm_magic_head_t magiclist[DRM_HASH_SIZE];
- /* Memory management */
- drm_map_list_t *maplist; /* Linked list of regions */
+ /* Linked list of mappable regions. Protected by dev_lock */
+ drm_map_list_t *maplist;
drm_local_map_t **context_sareas;
int max_context;
@@ -349,18 +362,13 @@ struct drm_device {
#endif
void *irqh; /* Handle from bus_setup_intr */
atomic_t context_flag; /* Context swapping flag */
- struct callout timer; /* Timer for delaying ctx switch */
int last_context; /* Last current context */
#if __FreeBSD_version >= 400005
struct task task;
#endif
#if __HAVE_VBL_IRQ
- wait_queue_head_t vbl_queue; /* vbl wait channel */
+ int vbl_queue; /* vbl wait channel */
atomic_t vbl_received;
-#if 0 /* vbl signals are untested */
- struct drm_vbl_sig_list vbl_sig_list;
- DRM_SPINTYPE vbl_lock;
-#endif
#endif
#ifdef __FreeBSD__
@@ -382,11 +390,6 @@ struct drm_device {
extern int DRM(flags);
- /* Authentication (drm_auth.h) */
-extern int DRM(add_magic)(drm_device_t *dev, drm_file_t *priv,
- drm_magic_t magic);
-extern int DRM(remove_magic)(drm_device_t *dev, drm_magic_t magic);
-
/* Driver support (drm_drv.h) */
extern int DRM(version)( DRM_IOCTL_ARGS );