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virtio-pci: introduce modern device module

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Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210104065503.199631-17-jasowang@redhat.com

Including a bugfix:

virtio: don't prompt CONFIG_VIRTIO_PCI_MODERN

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Anders Roxell <anders.roxell@linaro.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Fixes: 86b87c9d858b6 ("virtio-pci: introduce modern device module")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20210223061905.422659-2-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang
2021-01-04 14:55:00 +08:00
committed by Michael S. Tsirkin
parent 8000a6b602
commit fd502729fb
6 changed files with 721 additions and 643 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/virtio/virtio_pci_common.h
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@@ -25,6 +25,7 @@
#include <linux/virtio_config.h>
#include <linux/virtio_ring.h>
#include <linux/virtio_pci.h>
#include <linux/virtio_pci_modern.h>
#include <linux/highmem.h>
#include <linux/spinlock.h>
@@ -39,32 +40,6 @@ struct virtio_pci_vq_info {
unsigned msix_vector;
};
struct virtio_pci_modern_device {
struct pci_dev *pci_dev;
struct virtio_pci_common_cfg __iomem *common;
/* Device-specific data (non-legacy mode) */
void __iomem *device;
/* Base of vq notifications (non-legacy mode). */
void __iomem *notify_base;
/* Where to read and clear interrupt */
u8 __iomem *isr;
/* So we can sanity-check accesses. */
size_t notify_len;
size_t device_len;
/* Capability for when we need to map notifications per-vq. */
int notify_map_cap;
/* Multiply queue_notify_off by this value. (non-legacy mode). */
u32 notify_offset_multiplier;
int modern_bars;
struct virtio_device_id id;
};
/* Our device structure */
struct virtio_pci_device {
struct virtio_device vdev;