[3/5] vfio: Add ioctl to re-enable interrupts

Commit Message

Alex Williamson Oct. 30, 2010, 4:59 p.m. UTC

None

Patch

diff --git a/drivers/vfio/vfio_intrs.c b/drivers/vfio/vfio_intrs.c
index aaee175..a57d5aa 100644
--- a/drivers/vfio/vfio_intrs.c
+++ b/drivers/vfio/vfio_intrs.c
@@ -83,6 +83,23 @@  done:
 	return ret;
 }
 
+int vfio_irq_eoi(struct vfio_dev *vdev)
+{
+	struct pci_dev *pdev = vdev->pdev;
+	u16 cmd;
+
+	spin_lock_irq(&vdev->irqlock);
+	pci_block_user_cfg_access(pdev);
+
+	pci_read_config_word(pdev, PCI_COMMAND, &cmd);
+	cmd &= ~PCI_COMMAND_INTX_DISABLE;
+	pci_write_config_word(pdev, PCI_COMMAND, cmd);
+
+	pci_unblock_user_cfg_access(pdev);
+	spin_unlock_irq(&vdev->irqlock);
+	return 0;
+}
+
 /*
  * MSI and MSI-X Interrupt handler.
  * Just signal an event
diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
index f671795..72db79c 100644
--- a/drivers/vfio/vfio_main.c
+++ b/drivers/vfio/vfio_main.c
@@ -464,6 +464,10 @@  static long vfio_unl_ioctl(struct file *filep,
 		ret = vfio_domain_unset(vdev);
 		break;
 
+	case VFIO_IRQ_EOI:
+		ret = vfio_irq_eoi(vdev);
+		break;
+
 	default:
 		return -EINVAL;
 	}
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index c491180..73d7e84 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -155,6 +155,7 @@  void vfio_error_resume(struct pci_dev *);
 #define VFIO_SUSPEND_REPLY_TIMEOUT	(5*HZ)
 
 irqreturn_t vfio_interrupt(int, void *);
+int vfio_irq_eoi(struct vfio_dev *);
 
 #endif	/* __KERNEL__ */
 
@@ -198,6 +199,8 @@  struct vfio_dma_map {
 /* Unset the IOMMU domain */
 #define	VFIO_DOMAIN_UNSET	_IO(';', 108)
 
+/* Re-enable INTx */
+#define	VFIO_IRQ_EOI		_IO(';', 109)
 /*
  * Reads, writes, and mmaps determine which PCI BAR (or config space)
  * from the high level bits of the file offset