drm: add support for secondary vertical blank interrupt to DRM core

Signed-off-by: Dave Airlie <airlied@linux.ie>

drivers/char/drm/drm.h

@@ -465,10 +465,12 @@ typedef struct drm_irq_busid {
 typedef enum {
 	_DRM_VBLANK_ABSOLUTE = 0x0,	/**< Wait for specific vblank sequence number */
 	_DRM_VBLANK_RELATIVE = 0x1,	/**< Wait for given number of vblanks */
+	_DRM_VBLANK_SECONDARY = 0x20000000,	/**< Secondary display controller */
 	_DRM_VBLANK_SIGNAL = 0x40000000	/**< Send signal instead of blocking */
 } drm_vblank_seq_type_t;
 
-#define _DRM_VBLANK_FLAGS_MASK _DRM_VBLANK_SIGNAL
+#define _DRM_VBLANK_TYPES_MASK (_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE)
+#define _DRM_VBLANK_FLAGS_MASK (_DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY)
 
 struct drm_wait_vblank_request {
 	drm_vblank_seq_type_t type;

drivers/char/drm/drmP.h

@@ -97,6 +97,7 @@
 #define DRIVER_IRQ_VBL     0x100
 #define DRIVER_DMA_QUEUE   0x200
 #define DRIVER_FB_DMA      0x400
+#define DRIVER_IRQ_VBL2    0x800
 
 /***********************************************************************/
 /** \name Begin the DRM... */
@@ -562,6 +563,7 @@ struct drm_driver {
 	void (*kernel_context_switch_unlock) (struct drm_device * dev,
 					      drm_lock_t *lock);
 	int (*vblank_wait) (struct drm_device * dev, unsigned int *sequence);
+	int (*vblank_wait2) (struct drm_device * dev, unsigned int *sequence);
 	int (*dri_library_name) (struct drm_device *dev, char *buf);
 
 	/**
@@ -708,8 +710,10 @@ typedef struct drm_device {
 
 	wait_queue_head_t vbl_queue;	/**< VBLANK wait queue */
 	atomic_t vbl_received;
+	atomic_t vbl_received2;		/**< number of secondary VBLANK interrupts */
 	spinlock_t vbl_lock;
 	drm_vbl_sig_t vbl_sigs;		/**< signal list to send on VBLANK */
+	drm_vbl_sig_t vbl_sigs2;	/**< signals to send on secondary VBLANK */
 	unsigned int vbl_pending;
 
 	/*@} */

drivers/char/drm/drm_core.h

@@ -24,11 +24,11 @@
 
 #define CORE_NAME		"drm"
 #define CORE_DESC		"DRM shared core routines"
-#define CORE_DATE		"20051102"
+#define CORE_DATE		"20060810"
 
 #define DRM_IF_MAJOR	1
-#define DRM_IF_MINOR	2
+#define DRM_IF_MINOR	3
 
 #define CORE_MAJOR	1
-#define CORE_MINOR	0
-#define CORE_PATCHLEVEL 1
+#define CORE_MINOR	1
+#define CORE_PATCHLEVEL 0

drivers/char/drm/drm_irq.c

@@ -121,6 +121,7 @@ static int drm_irq_install(drm_device_t * dev)
 		spin_lock_init(&dev->vbl_lock);
 
 		INIT_LIST_HEAD(&dev->vbl_sigs.head);
+		INIT_LIST_HEAD(&dev->vbl_sigs2.head);
 
 		dev->vbl_pending = 0;
 	}
@@ -248,9 +249,7 @@ int drm_wait_vblank(DRM_IOCTL_ARGS)
 	struct timeval now;
 	int ret = 0;
 	unsigned int flags;
-
-	if (!drm_core_check_feature(dev, DRIVER_IRQ_VBL))
-		return -EINVAL;
+	atomic_t *seq;
 
 	if (!dev->irq)
 		return -EINVAL;
@@ -258,9 +257,26 @@ int drm_wait_vblank(DRM_IOCTL_ARGS)
 	if (copy_from_user(&vblwait, argp, sizeof(vblwait)))
 		return -EFAULT;
 
-	switch (vblwait.request.type & ~_DRM_VBLANK_FLAGS_MASK) {
+	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 = (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 += atomic_read(&dev->vbl_received);
+		vblwait.request.sequence += atomic_read(seq);
 		vblwait.request.type &= ~_DRM_VBLANK_RELATIVE;
 	case _DRM_VBLANK_ABSOLUTE:
 		break;
@@ -268,13 +284,13 @@ int drm_wait_vblank(DRM_IOCTL_ARGS)
 		return -EINVAL;
 	}
 
-	flags = vblwait.request.type & _DRM_VBLANK_FLAGS_MASK;
-
 	if (flags & _DRM_VBLANK_SIGNAL) {
 		unsigned long irqflags;
+		drm_vbl_sig_t *vbl_sigs = (flags & _DRM_VBLANK_SECONDARY)
+				      ? &dev->vbl_sigs2 : &dev->vbl_sigs;
 		drm_vbl_sig_t *vbl_sig;
 
-		vblwait.reply.sequence = atomic_read(&dev->vbl_received);
+		vblwait.reply.sequence = atomic_read(seq);
 
 		spin_lock_irqsave(&dev->vbl_lock, irqflags);
 
@@ -282,7 +298,7 @@ int drm_wait_vblank(DRM_IOCTL_ARGS)
 		 * for the same vblank sequence number; nothing to be done in
 		 * that case
 		 */
-		list_for_each_entry(vbl_sig, &dev->vbl_sigs.head, head) {
+		list_for_each_entry(vbl_sig, &vbl_sigs->head, head) {
 			if (vbl_sig->sequence == vblwait.request.sequence
 			    && vbl_sig->info.si_signo == vblwait.request.signal
 			    && vbl_sig->task == current) {
@@ -315,11 +331,14 @@ int drm_wait_vblank(DRM_IOCTL_ARGS)
 
 		spin_lock_irqsave(&dev->vbl_lock, irqflags);
 
-		list_add_tail((struct list_head *)vbl_sig, &dev->vbl_sigs.head);
+		list_add_tail((struct list_head *)vbl_sig, &vbl_sigs->head);
 
 		spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
 	} else {
-		if (dev->driver->vblank_wait)
+		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);
@@ -347,27 +366,34 @@ int drm_wait_vblank(DRM_IOCTL_ARGS)
  */
 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;
+	int i;
 
 	spin_lock_irqsave(&dev->vbl_lock, flags);
 
-	list_for_each_safe(list, tmp, &dev->vbl_sigs.head) {
+	for (i = 0; i < 2; i++) {
+		struct list_head *list, *tmp;
+		drm_vbl_sig_t *vbl_sig;
+		drm_vbl_sig_t *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_safe(list, tmp, &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);
+				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);
+				drm_free(vbl_sig, sizeof(*vbl_sig),
+					 DRM_MEM_DRIVER);
 
 				dev->vbl_pending--;
 			}
 		}
+	}
 
 	spin_unlock_irqrestore(&dev->vbl_lock, flags);
 }