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virtio_pci: add isr field 

Use isr field instead of direct access to ioaddr.
This way generalizes easily to virtio 1.0.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2014-12-02 14:35:27 +02:00
parent d71a6fc6b9
commit af535722f8
1 changed files with 6 additions and 1 deletions
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7
drivers/virtio/virtio_pci.c
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@ -40,6 +40,9 @@ struct virtio_pci_device
/* the IO mapping for the PCI config space */ /* the IO mapping for the PCI config space */
void __iomem *ioaddr; void __iomem *ioaddr;
/* the IO mapping for ISR operation */
void __iomem *isr;
/* a list of queues so we can dispatch IRQs */ /* a list of queues so we can dispatch IRQs */
spinlock_t lock; spinlock_t lock;
struct list_head virtqueues; struct list_head virtqueues;
@ -248,7 +251,7 @@ static irqreturn_t vp_interrupt(int irq, void *opaque)
/* reading the ISR has the effect of also clearing it so it's very /* reading the ISR has the effect of also clearing it so it's very
* important to save off the value. */ * important to save off the value. */
isr = ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR); isr = ioread8(vp_dev->isr);
/* It's definitely not us if the ISR was not high */ /* It's definitely not us if the ISR was not high */
if (!isr) if (!isr)
@ -719,6 +722,8 @@ static int virtio_pci_probe(struct pci_dev *pci_dev,
goto out_req_regions; goto out_req_regions;
} }
vp_dev->isr = vp_dev->ioaddr + VIRTIO_PCI_ISR;
pci_set_drvdata(pci_dev, vp_dev); pci_set_drvdata(pci_dev, vp_dev);
pci_set_master(pci_dev); pci_set_master(pci_dev);