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Commit 9b82e65d authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge git://github.com/rustyrussell/linux 

* git://github.com/rustyrussell/linux:
  virtio-pci: make reset operation safer
  virtio-mmio: Correct the name of the guest features selector
  virtio: add HAS_IOMEM dependency to MMIO platform bus driver
parents 8174a06e e6af578c

drivers/virtio/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -37,7 +37,7 @@ config VIRTIO_BALLOON 


 config VIRTIO_MMIO

 	tristate "Platform bus driver for memory mapped virtio devices (EXPERIMENTAL)"

 	depends on EXPERIMENTAL

 	depends on HAS_IOMEM && EXPERIMENTAL

 	select VIRTIO

 	select VIRTIO_RING

 	---help---

drivers/virtio/virtio_mmio.c

+1 −1
Original line number Diff line number Diff line
@@ -118,7 +118,7 @@ static void vm_finalize_features(struct virtio_device *vdev) 
	vring_transport_features(vdev);



	for (i = 0; i < ARRAY_SIZE(vdev->features); i++) {

		writel(i, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES_SET);

		writel(i, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES_SEL);

		writel(vdev->features[i],

				vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES);

	}

drivers/virtio/virtio_pci.c

+18 −0
Original line number Diff line number Diff line
@@ -169,11 +169,29 @@ static void vp_set_status(struct virtio_device *vdev, u8 status) 
	iowrite8(status, vp_dev->ioaddr + VIRTIO_PCI_STATUS);

}



/* wait for pending irq handlers */

static void vp_synchronize_vectors(struct virtio_device *vdev)

{

	struct virtio_pci_device *vp_dev = to_vp_device(vdev);

	int i;



	if (vp_dev->intx_enabled)

		synchronize_irq(vp_dev->pci_dev->irq);



	for (i = 0; i < vp_dev->msix_vectors; ++i)

		synchronize_irq(vp_dev->msix_entries[i].vector);

}



static void vp_reset(struct virtio_device *vdev)

{

	struct virtio_pci_device *vp_dev = to_vp_device(vdev);

	/* 0 status means a reset. */

	iowrite8(0, vp_dev->ioaddr + VIRTIO_PCI_STATUS);

	/* Flush out the status write, and flush in device writes,

	 * including MSi-X interrupts, if any. */

	ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);

	/* Flush pending VQ/configuration callbacks. */

	vp_synchronize_vectors(vdev);

}



/* the notify function used when creating a virt queue */

include/linux/virtio_config.h

+2 −0
Original line number Diff line number Diff line
@@ -85,6 +85,8 @@ 
 * @reset: reset the device

 *	vdev: the virtio device

 *	After this, status and feature negotiation must be done again

 *	Device must not be reset from its vq/config callbacks, or in

 *	parallel with being added/removed.

 * @find_vqs: find virtqueues and instantiate them.

 *	vdev: the virtio_device

 *	nvqs: the number of virtqueues to find

include/linux/virtio_mmio.h

+1 −1
Original line number Diff line number Diff line
@@ -63,7 +63,7 @@ 
#define VIRTIO_MMIO_GUEST_FEATURES	0x020



/* Activated features set selector - Write Only */

#define VIRTIO_MMIO_GUEST_FEATURES_SET	0x024

#define VIRTIO_MMIO_GUEST_FEATURES_SEL	0x024



/* Guest's memory page size in bytes - Write Only */

#define VIRTIO_MMIO_GUEST_PAGE_SIZE	0x028