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@@ -14,179 +14,10 @@
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*
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*/
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-#include <linux/module.h>
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-#include <linux/list.h>
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-#include <linux/pci.h>
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-#include <linux/slab.h>
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-#include <linux/interrupt.h>
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-#include <linux/virtio.h>
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-#include <linux/virtio_config.h>
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-#include <linux/virtio_ring.h>
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-#include <linux/virtio_pci.h>
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-#include <linux/highmem.h>
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-#include <linux/spinlock.h>
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-
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-MODULE_AUTHOR("Anthony Liguori <aliguori@us.ibm.com>");
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-MODULE_DESCRIPTION("virtio-pci");
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-MODULE_LICENSE("GPL");
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-MODULE_VERSION("1");
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-
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-struct virtio_pci_vq_info {
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- /* the actual virtqueue */
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- struct virtqueue *vq;
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-
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- /* the number of entries in the queue */
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- int num;
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-
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- /* the virtual address of the ring queue */
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- void *queue;
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-
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- /* the list node for the virtqueues list */
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- struct list_head node;
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-
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- /* MSI-X vector (or none) */
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- unsigned msix_vector;
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-};
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-
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-/* Our device structure */
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-struct virtio_pci_device {
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- struct virtio_device vdev;
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- struct pci_dev *pci_dev;
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-
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- /* the IO mapping for the PCI config space */
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- void __iomem *ioaddr;
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-
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- /* the IO mapping for ISR operation */
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- void __iomem *isr;
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-
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- /* a list of queues so we can dispatch IRQs */
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- spinlock_t lock;
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- struct list_head virtqueues;
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-
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- /* array of all queues for house-keeping */
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- struct virtio_pci_vq_info **vqs;
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-
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- /* MSI-X support */
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- int msix_enabled;
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- int intx_enabled;
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- struct msix_entry *msix_entries;
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- cpumask_var_t *msix_affinity_masks;
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- /* Name strings for interrupts. This size should be enough,
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- * and I'm too lazy to allocate each name separately. */
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- char (*msix_names)[256];
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- /* Number of available vectors */
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- unsigned msix_vectors;
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- /* Vectors allocated, excluding per-vq vectors if any */
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- unsigned msix_used_vectors;
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-
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- /* Whether we have vector per vq */
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- bool per_vq_vectors;
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-
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- struct virtqueue *(*setup_vq)(struct virtio_pci_device *vp_dev,
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- struct virtio_pci_vq_info *info,
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- unsigned idx,
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- void (*callback)(struct virtqueue *vq),
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- const char *name,
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- u16 msix_vec);
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- void (*del_vq)(struct virtio_pci_vq_info *info);
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- u16 (*config_vector)(struct virtio_pci_device *vp_dev, u16 vector);
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-};
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-
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-/* Constants for MSI-X */
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-/* Use first vector for configuration changes, second and the rest for
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- * virtqueues Thus, we need at least 2 vectors for MSI. */
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-enum {
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- VP_MSIX_CONFIG_VECTOR = 0,
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- VP_MSIX_VQ_VECTOR = 1,
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-};
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-
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-/* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */
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-static const struct pci_device_id virtio_pci_id_table[] = {
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- { PCI_DEVICE(0x1af4, PCI_ANY_ID) },
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- { 0 }
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-};
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-
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-MODULE_DEVICE_TABLE(pci, virtio_pci_id_table);
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-
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-/* Convert a generic virtio device to our structure */
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-static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev)
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-{
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- return container_of(vdev, struct virtio_pci_device, vdev);
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-}
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-
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-/* virtio config->get_features() implementation */
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-static u64 vp_get_features(struct virtio_device *vdev)
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-{
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- struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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-
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- /* When someone needs more than 32 feature bits, we'll need to
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- * steal a bit to indicate that the rest are somewhere else. */
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- return ioread32(vp_dev->ioaddr + VIRTIO_PCI_HOST_FEATURES);
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-}
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-
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-/* virtio config->finalize_features() implementation */
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-static int vp_finalize_features(struct virtio_device *vdev)
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-{
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- struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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-
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- /* Give virtio_ring a chance to accept features. */
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- vring_transport_features(vdev);
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-
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- /* Make sure we don't have any features > 32 bits! */
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- BUG_ON((u32)vdev->features != vdev->features);
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-
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- /* We only support 32 feature bits. */
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- iowrite32(vdev->features, vp_dev->ioaddr + VIRTIO_PCI_GUEST_FEATURES);
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-
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- return 0;
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-}
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-
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-/* virtio config->get() implementation */
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-static void vp_get(struct virtio_device *vdev, unsigned offset,
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- void *buf, unsigned len)
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-{
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- struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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- void __iomem *ioaddr = vp_dev->ioaddr +
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- VIRTIO_PCI_CONFIG(vp_dev) + offset;
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- u8 *ptr = buf;
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- int i;
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-
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- for (i = 0; i < len; i++)
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- ptr[i] = ioread8(ioaddr + i);
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-}
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-
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-/* the config->set() implementation. it's symmetric to the config->get()
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- * implementation */
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-static void vp_set(struct virtio_device *vdev, unsigned offset,
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- const void *buf, unsigned len)
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-{
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- struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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- void __iomem *ioaddr = vp_dev->ioaddr +
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- VIRTIO_PCI_CONFIG(vp_dev) + offset;
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- const u8 *ptr = buf;
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- int i;
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-
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- for (i = 0; i < len; i++)
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- iowrite8(ptr[i], ioaddr + i);
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-}
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-
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-/* config->{get,set}_status() implementations */
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-static u8 vp_get_status(struct virtio_device *vdev)
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-{
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- struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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- return ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
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-}
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-
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-static void vp_set_status(struct virtio_device *vdev, u8 status)
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-{
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- struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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- /* We should never be setting status to 0. */
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- BUG_ON(status == 0);
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- iowrite8(status, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
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-}
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+#include "virtio_pci_legacy.c"
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/* wait for pending irq handlers */
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-static void vp_synchronize_vectors(struct virtio_device *vdev)
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+void vp_synchronize_vectors(struct virtio_device *vdev)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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int i;
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@@ -198,20 +29,8 @@ static void vp_synchronize_vectors(struct virtio_device *vdev)
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synchronize_irq(vp_dev->msix_entries[i].vector);
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}
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-static void vp_reset(struct virtio_device *vdev)
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-{
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- struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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- /* 0 status means a reset. */
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- iowrite8(0, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
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- /* Flush out the status write, and flush in device writes,
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- * including MSi-X interrupts, if any. */
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- ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
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- /* Flush pending VQ/configuration callbacks. */
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- vp_synchronize_vectors(vdev);
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-}
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-
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/* the notify function used when creating a virt queue */
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-static bool vp_notify(struct virtqueue *vq)
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+bool vp_notify(struct virtqueue *vq)
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{
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/* we write the queue's selector into the notification register to
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* signal the other end */
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@@ -272,15 +91,6 @@ static irqreturn_t vp_interrupt(int irq, void *opaque)
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return vp_vring_interrupt(irq, opaque);
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}
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-static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
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-{
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- /* Setup the vector used for configuration events */
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- iowrite16(vector, vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
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- /* Verify we had enough resources to assign the vector */
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- /* Will also flush the write out to device */
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- return ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
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-}
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-
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static void vp_free_vectors(struct virtio_device *vdev)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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@@ -401,68 +211,6 @@ static int vp_request_intx(struct virtio_device *vdev)
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return err;
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}
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-static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
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- struct virtio_pci_vq_info *info,
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- unsigned index,
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- void (*callback)(struct virtqueue *vq),
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- const char *name,
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- u16 msix_vec)
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-{
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- struct virtqueue *vq;
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- unsigned long size;
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- u16 num;
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- int err;
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-
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- /* Select the queue we're interested in */
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- iowrite16(index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
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-
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- /* Check if queue is either not available or already active. */
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- num = ioread16(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NUM);
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- if (!num || ioread32(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN))
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- return ERR_PTR(-ENOENT);
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-
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- info->num = num;
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- info->msix_vector = msix_vec;
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-
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- size = PAGE_ALIGN(vring_size(num, VIRTIO_PCI_VRING_ALIGN));
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- info->queue = alloc_pages_exact(size, GFP_KERNEL|__GFP_ZERO);
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- if (info->queue == NULL)
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- return ERR_PTR(-ENOMEM);
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-
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- /* activate the queue */
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- iowrite32(virt_to_phys(info->queue) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT,
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- vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
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-
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- /* create the vring */
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- vq = vring_new_virtqueue(index, info->num,
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- VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
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- true, info->queue, vp_notify, callback, name);
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- if (!vq) {
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- err = -ENOMEM;
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- goto out_activate_queue;
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- }
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-
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- vq->priv = (void __force *)vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY;
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-
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- if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
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- iowrite16(msix_vec, vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
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- msix_vec = ioread16(vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
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- if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
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- err = -EBUSY;
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- goto out_assign;
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- }
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- }
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-
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- return vq;
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-
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-out_assign:
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- vring_del_virtqueue(vq);
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-out_activate_queue:
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- iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
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- free_pages_exact(info->queue, size);
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- return ERR_PTR(err);
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-}
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-
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static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned index,
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void (*callback)(struct virtqueue *vq),
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const char *name,
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@@ -498,30 +246,6 @@ out_info:
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return vq;
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}
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-static void del_vq(struct virtio_pci_vq_info *info)
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-{
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- struct virtqueue *vq = info->vq;
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- struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
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- unsigned long size;
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-
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- iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
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-
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- if (vp_dev->msix_enabled) {
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- iowrite16(VIRTIO_MSI_NO_VECTOR,
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- vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
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- /* Flush the write out to device */
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- ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR);
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- }
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-
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- vring_del_virtqueue(vq);
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-
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- /* Select and deactivate the queue */
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- iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
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-
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- size = PAGE_ALIGN(vring_size(info->num, VIRTIO_PCI_VRING_ALIGN));
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- free_pages_exact(info->queue, size);
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-}
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-
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static void vp_del_vq(struct virtqueue *vq)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
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@@ -537,7 +261,7 @@ static void vp_del_vq(struct virtqueue *vq)
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}
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/* the config->del_vqs() implementation */
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-static void vp_del_vqs(struct virtio_device *vdev)
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+void vp_del_vqs(struct virtio_device *vdev)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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struct virtqueue *vq, *n;
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@@ -637,10 +361,10 @@ error_find:
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}
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/* the config->find_vqs() implementation */
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-static int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
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- struct virtqueue *vqs[],
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- vq_callback_t *callbacks[],
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- const char *names[])
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+int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
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+ struct virtqueue *vqs[],
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+ vq_callback_t *callbacks[],
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+ const char *names[])
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{
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int err;
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@@ -658,7 +382,7 @@ static int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
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false, false);
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}
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-static const char *vp_bus_name(struct virtio_device *vdev)
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+const char *vp_bus_name(struct virtio_device *vdev)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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@@ -670,7 +394,7 @@ static const char *vp_bus_name(struct virtio_device *vdev)
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* - OR over all affinities for shared MSI
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* - ignore the affinity request if we're using INTX
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*/
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-static int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
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+int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
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{
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struct virtio_device *vdev = vq->vdev;
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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@@ -694,21 +418,7 @@ static int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
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return 0;
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}
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-static const struct virtio_config_ops virtio_pci_config_ops = {
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- .get = vp_get,
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- .set = vp_set,
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- .get_status = vp_get_status,
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- .set_status = vp_set_status,
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- .reset = vp_reset,
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- .find_vqs = vp_find_vqs,
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- .del_vqs = vp_del_vqs,
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- .get_features = vp_get_features,
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- .finalize_features = vp_finalize_features,
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- .bus_name = vp_bus_name,
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- .set_vq_affinity = vp_set_vq_affinity,
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-};
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-
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-static void virtio_pci_release_dev(struct device *_d)
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+void virtio_pci_release_dev(struct device *_d)
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{
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/*
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* No need for a release method as we allocate/free
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@@ -717,100 +427,6 @@ static void virtio_pci_release_dev(struct device *_d)
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*/
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}
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-/* the PCI probing function */
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-static int virtio_pci_probe(struct pci_dev *pci_dev,
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- const struct pci_device_id *id)
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-{
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- struct virtio_pci_device *vp_dev;
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- int err;
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-
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- /* We only own devices >= 0x1000 and <= 0x103f: leave the rest. */
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- if (pci_dev->device < 0x1000 || pci_dev->device > 0x103f)
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- return -ENODEV;
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-
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- if (pci_dev->revision != VIRTIO_PCI_ABI_VERSION) {
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- printk(KERN_ERR "virtio_pci: expected ABI version %d, got %d\n",
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- VIRTIO_PCI_ABI_VERSION, pci_dev->revision);
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- return -ENODEV;
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- }
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-
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- /* allocate our structure and fill it out */
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- vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL);
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- if (vp_dev == NULL)
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- return -ENOMEM;
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-
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- vp_dev->vdev.dev.parent = &pci_dev->dev;
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- vp_dev->vdev.dev.release = virtio_pci_release_dev;
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- vp_dev->vdev.config = &virtio_pci_config_ops;
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- vp_dev->pci_dev = pci_dev;
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- INIT_LIST_HEAD(&vp_dev->virtqueues);
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- spin_lock_init(&vp_dev->lock);
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-
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- /* Disable MSI/MSIX to bring device to a known good state. */
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- pci_msi_off(pci_dev);
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-
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- /* enable the device */
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- err = pci_enable_device(pci_dev);
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- if (err)
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- goto out;
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-
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- err = pci_request_regions(pci_dev, "virtio-pci");
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- if (err)
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- goto out_enable_device;
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-
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- vp_dev->ioaddr = pci_iomap(pci_dev, 0, 0);
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- if (vp_dev->ioaddr == NULL) {
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- err = -ENOMEM;
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- goto out_req_regions;
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- }
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-
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- vp_dev->isr = vp_dev->ioaddr + VIRTIO_PCI_ISR;
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-
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- pci_set_drvdata(pci_dev, vp_dev);
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- pci_set_master(pci_dev);
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-
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- /* we use the subsystem vendor/device id as the virtio vendor/device
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- * id. this allows us to use the same PCI vendor/device id for all
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- * virtio devices and to identify the particular virtio driver by
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- * the subsystem ids */
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- vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor;
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- vp_dev->vdev.id.device = pci_dev->subsystem_device;
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-
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- vp_dev->config_vector = vp_config_vector;
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- vp_dev->setup_vq = setup_vq;
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- vp_dev->del_vq = del_vq;
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-
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- /* finally register the virtio device */
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- err = register_virtio_device(&vp_dev->vdev);
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- if (err)
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- goto out_set_drvdata;
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-
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- return 0;
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|
-
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-out_set_drvdata:
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|
- pci_iounmap(pci_dev, vp_dev->ioaddr);
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-out_req_regions:
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- pci_release_regions(pci_dev);
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|
|
-out_enable_device:
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- pci_disable_device(pci_dev);
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-out:
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|
|
- kfree(vp_dev);
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|
|
- return err;
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|
|
-}
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|
|
-
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|
|
-static void virtio_pci_remove(struct pci_dev *pci_dev)
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|
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-{
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|
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- struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
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|
|
-
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|
|
- unregister_virtio_device(&vp_dev->vdev);
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|
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-
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|
|
- vp_del_vqs(&vp_dev->vdev);
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|
|
- pci_iounmap(pci_dev, vp_dev->ioaddr);
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|
|
- pci_release_regions(pci_dev);
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|
|
- pci_disable_device(pci_dev);
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|
|
- kfree(vp_dev);
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|
|
-}
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|
|
-
|
|
|
#ifdef CONFIG_PM_SLEEP
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|
|
static int virtio_pci_freeze(struct device *dev)
|
|
|
{
|
|
|
@@ -839,19 +455,7 @@ static int virtio_pci_restore(struct device *dev)
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|
|
return virtio_device_restore(&vp_dev->vdev);
|
|
|
}
|
|
|
|
|
|
-static const struct dev_pm_ops virtio_pci_pm_ops = {
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|
|
+const struct dev_pm_ops virtio_pci_pm_ops = {
|
|
|
SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore)
|
|
|
};
|
|
|
#endif
|
|
|
-
|
|
|
-static struct pci_driver virtio_pci_driver = {
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|
|
- .name = "virtio-pci",
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|
|
- .id_table = virtio_pci_id_table,
|
|
|
- .probe = virtio_pci_probe,
|
|
|
- .remove = virtio_pci_remove,
|
|
|
-#ifdef CONFIG_PM_SLEEP
|
|
|
- .driver.pm = &virtio_pci_pm_ops,
|
|
|
-#endif
|
|
|
-};
|
|
|
-
|
|
|
-module_pci_driver(virtio_pci_driver);
|
Michael S. Tsirkin