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virtio_pci_modern: type-safe io accessors

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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>
This commit is contained in:
Michael S. Tsirkin
2015-04-01 13:33:20 +10:30
committed by Rusty Russell
parent 3eebd233fc
commit c5d4c2c9ce
1 changed files with 37 additions and 0 deletions
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37
drivers/virtio/virtio_pci_modern.c
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@ -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,