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| author | Michael S. Tsirkin <mst@redhat.com> | 2015-04-01 13:33:20 +1030 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2015-04-01 14:37:15 +1030 |
| commit | c5d4c2c9ce4f4b6980a71dec50f2db4c2e55778d (patch) | |
| tree | 237c8573d47db80749a3353eee128f7ec1d57c2c /drivers/virtio | |
| parent | 3eebd233fcb392286d385e764eb91e90d6218cdf (diff) | |
| download | linux-0-day-c5d4c2c9ce4f4b6980a71dec50f2db4c2e55778d.tar.gz linux-0-day-c5d4c2c9ce4f4b6980a71dec50f2db4c2e55778d.tar.xz | |
virtio_pci_modern: type-safe io accessors
The spec is very clear on this:
4.1.3.1 Driver Requirements: PCI Device Layout
The driver MUST access each field using the “natural” access method,
i.e. 32-bit accesses for 32-bit fields, 16-bit accesses for 16-bit
fields and 8-bit accesses for 8-bit fields.
Add type-safe wrappers to prevent access with incorrect width.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_pci_modern.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c index 2aa38e59db2e0..826e500d4819d 100644 --- a/drivers/virtio/virtio_pci_modern.c +++ b/drivers/virtio/virtio_pci_modern.c @@ -20,6 +20,43 @@ #define VIRTIO_PCI_NO_LEGACY #include "virtio_pci_common.h" +/* + * Type-safe wrappers for io accesses. + * Use these to enforce at compile time the following spec requirement: + * + * The driver MUST access each field using the “natural” access + * method, i.e. 32-bit accesses for 32-bit fields, 16-bit accesses + * for 16-bit fields and 8-bit accesses for 8-bit fields. + */ +static inline u8 vp_ioread8(u8 __iomem *addr) +{ + return ioread8(addr); +} +static inline u16 vp_ioread16 (u16 __iomem *addr) +{ + return ioread16(addr); +} + +static inline u32 vp_ioread32(u32 __iomem *addr) +{ + return ioread32(addr); +} + +static inline void vp_iowrite8(u8 value, u8 __iomem *addr) +{ + iowrite8(value, addr); +} + +static inline void vp_iowrite16(u16 value, u16 __iomem *addr) +{ + iowrite16(value, addr); +} + +static inline void vp_iowrite32(u32 value, u32 __iomem *addr) +{ + iowrite32(value, addr); +} + static void __iomem *map_capability(struct pci_dev *dev, int off, size_t minlen, u32 align, |