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

Browse Source 
* 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
This commit is contained in:
Linus Torvalds 2011-11-23 20:19:31 -08:00
commit 9b82e65d65
5 changed files with 23 additions and 3 deletions
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2
drivers/virtio/Kconfig
View File

@ -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---

2
drivers/virtio/virtio_mmio.c
View File

@ -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);
}

18
drivers/virtio/virtio_pci.c
View File

@ -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 */

2
include/linux/virtio_config.h
View File

@ -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

2
include/linux/virtio_mmio.h
View File

@ -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