- Tie the DRM to a specific device: setunique no longer succeeds when given

    a busid that doesn't correspond to the device the DRM is attached to.
    This is a breaking of backwards-compatibility only for the
    multiple-DRI-head case with X Servers that don't use interface 1.1.
- Move irq_busid to drm_irq.h and make it only return the IRQ for the
    current device. Retains compatibility with previous X Servers, cleans
    up unnecessary code. This means no irq_busid on !__HAVE_IRQ, but can be
    changed if necessary.
- Bump interface version to 1.2. This version when set signifies that the
    control ioctl should ignore the irq number passed in and enable the
    interrupt handler for the attached device. Otherwise it errors out when
    the passed-in irq is not equal to the device's.
- Store the highest version the interface has been set to in the device.
- Fix a recursion on DRM_LOCK in irq_uninstall on FreeBSD. This leaves
    irq_uninstall being done without the lock in some cases, but it was
    racey anyways.

1 files changed, 74 insertions, 46 deletions

diff --git a/bsd-core/drm_irq.c b/bsd-core/drm_irq.c
index f984118e..1de817c3 100644
--- a/bsd-core/drm_irq.c
+++ b/bsd-core/drm_irq.c
@@ -28,6 +28,29 @@
  *
  */
 
+int DRM(irq_by_busid)( DRM_IOCTL_ARGS )
+{
+	DRM_DEVICE;
+	drm_irq_busid_t irq;
+
+	DRM_COPY_FROM_USER_IOCTL(irq, (drm_irq_busid_t *)data, sizeof(irq));
+
+	if ((irq.busnum >> 8) != dev->pci_domain ||
+	    (irq.busnum & 0xff) != dev->pci_bus ||
+	    irq.devnum != dev->pci_slot ||
+	    irq.funcnum != dev->pci_func)
+		return EINVAL;
+
+	irq.irq = dev->irq;
+
+	DRM_DEBUG("%d:%d:%d => IRQ %d\n",
+		  irq.busnum, irq.devnum, irq.funcnum, irq.irq);
+
+	DRM_COPY_TO_USER_IOCTL( (drm_irq_busid_t *)data, irq, sizeof(irq) );
+
+	return 0;
+}
+
 #if defined(__FreeBSD__) && __FreeBSD_version >= 500000
 static irqreturn_t
 DRM(irq_handler_wrap)(DRM_IRQ_ARGS)
@@ -40,22 +63,22 @@ DRM(irq_handler_wrap)(DRM_IRQ_ARGS)
 }
 #endif
 
-int DRM(irq_install)( drm_device_t *dev, int irq )
+int DRM(irq_install)(drm_device_t *dev)
 {
 	int retcode;
 
-	if ( irq == 0 || dev->dev_private == NULL)
+	if (dev->irq == 0 || dev->dev_private == NULL)
 		return DRM_ERR(EINVAL);
 
 	DRM_LOCK();
-	if ( dev->irq ) {
+	if (dev->irq_enabled) {
 		DRM_UNLOCK();
 		return DRM_ERR(EBUSY);
 	}
-	dev->irq = irq;
+	dev->irq_enabled = 1;
 	DRM_UNLOCK();
 
-	DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, irq );
+	DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, dev->irq );
 
 	dev->context_flag = 0;
 
@@ -68,31 +91,18 @@ int DRM(irq_install)( drm_device_t *dev, int irq )
 
 	DRM_SPININIT(dev->irq_lock, "DRM IRQ lock");
 
-#if __HAVE_VBL_IRQ && 0 /* disabled */
-	TAILQ_INIT( &dev->vbl_sig_list );
-#endif
-
 				/* Before installing handler */
 	DRM(driver_irq_preinstall)( dev );
 
 				/* Install handler */
-	dev->irqrid = 0;
 #ifdef __FreeBSD__
+	dev->irqrid = 0;
 	dev->irqr = bus_alloc_resource(dev->device, SYS_RES_IRQ, &dev->irqrid,
 				      0, ~0, 1, RF_SHAREABLE);
 	if (!dev->irqr) {
-#elif defined(__NetBSD__)
-	if (pci_intr_map(&dev->pa, &dev->ih) != 0) {
-#endif
-		DRM_LOCK();
-		DRM_SPINUNINIT(dev->irq_lock);
-		dev->irq = 0;
-		dev->irqrid = 0;
-		DRM_UNLOCK();
-		return ENOENT;
+		retcode = ENOENT;
+		goto err;
 	}
-	
-#ifdef __FreeBSD__
 #if __FreeBSD_version < 500000
 	retcode = bus_setup_intr(dev->device, dev->irqr, INTR_TYPE_TTY,
 				 DRM(irq_handler), dev, &dev->irqh);
@@ -100,45 +110,56 @@ int DRM(irq_install)( drm_device_t *dev, int irq )
 	retcode = bus_setup_intr(dev->device, dev->irqr, INTR_TYPE_TTY | INTR_MPSAFE,
 				 DRM(irq_handler_wrap), dev, &dev->irqh);
 #endif
-	if ( retcode ) {
+	if (retcode != 0)
+		goto err;
 #elif defined(__NetBSD__)
+	if (pci_intr_map(&dev->pa, &dev->ih) != 0) {
+		retcode = ENOENT;
+		goto err;
+	}
 	dev->irqh = pci_intr_establish(&dev->pa.pa_pc, dev->ih, IPL_TTY,
 	    (irqreturn_t (*)(DRM_IRQ_ARGS))DRM(irq_handler), dev);
-	if ( !dev->irqh ) {
-#endif
-		DRM_LOCK();
-#ifdef __FreeBSD__
-		bus_release_resource(dev->device, SYS_RES_IRQ, dev->irqrid, dev->irqr);
-#endif
-		DRM_SPINUNINIT(dev->irq_lock);
-		dev->irq = 0;
-		dev->irqrid = 0;
-		DRM_UNLOCK();
-		return retcode;
+	if (!dev->irqh) {
+		retcode = ENOENT;
+		goto err;
 	}
+#endif
 
 				/* After installing handler */
 	DRM(driver_irq_postinstall)( dev );
 
 	return 0;
+err:
+	DRM_LOCK();
+	dev->irq_enabled = 0;
+#ifdef ___FreeBSD__
+	if (dev->irqrid != 0) {
+		bus_release_resource(dev->device, SYS_RES_IRQ, dev->irqrid,
+		    dev->irqr);
+		dev->irqrid = 0;
+	}
+#endif
+	DRM_SPINUNINIT(dev->irq_lock);
+	DRM_UNLOCK();
+	return retcode;
 }
 
+/* XXX: This function needs to be called with the device lock held.  In some
+ * cases it isn't, so far.
+ */
 int DRM(irq_uninstall)( drm_device_t *dev )
 {
-	int irq;
+	int irq_enabled;
 	int irqrid;
-	
-	DRM_LOCK();
-	irq = dev->irq;
-	irqrid = dev->irqrid;
-	dev->irq = 0;
-	dev->irqrid = 0;
-	DRM_UNLOCK();
 
-	if ( !irq )
+	if (!dev->irq_enabled)
 		return DRM_ERR(EINVAL);
 
-	DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, irq );
+	dev->irq_enabled = 0;
+	irqrid = dev->irqrid;
+	dev->irqrid = 0;
+
+	DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, dev->irq );
 
 	DRM(driver_irq_uninstall)( dev );
 
@@ -157,14 +178,21 @@ int DRM(control)( DRM_IOCTL_ARGS )
 {
 	DRM_DEVICE;
 	drm_control_t ctl;
+	int err;
 
 	DRM_COPY_FROM_USER_IOCTL( ctl, (drm_control_t *) data, sizeof(ctl) );
 
 	switch ( ctl.func ) {
 	case DRM_INST_HANDLER:
-		return DRM(irq_install)( dev, ctl.irq );
+		if (dev->if_version < DRM_IF_VERSION(1, 2) &&
+		    ctl.irq != dev->irq)
+			return DRM_ERR(EINVAL);
+		return DRM(irq_install)(dev);
 	case DRM_UNINST_HANDLER:
-		return DRM(irq_uninstall)( dev );
+		DRM_LOCK();
+		err = DRM(irq_uninstall)( dev );
+		DRM_UNLOCK();
+		return err;
 	default:
 		return DRM_ERR(EINVAL);
 	}
@@ -178,7 +206,7 @@ int DRM(wait_vblank)( DRM_IOCTL_ARGS )
 	struct timeval now;
 	int ret;
 
-	if (!dev->irq)
+	if (!dev->irq_enabled)
 		return DRM_ERR(EINVAL);
 
 	DRM_COPY_FROM_USER_IOCTL( vblwait, (drm_wait_vblank_t *)data,