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ocxl: Add AFU interrupt support

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Add user APIs through ioctl to allocate, free, and be notified of an
AFU interrupt.

For opencapi, an AFU can trigger an interrupt on the host by sending a
specific command targeting a 64-bit object handle. On POWER9, this is
implemented by mapping a special page in the address space of a
process and a write to that page will trigger an interrupt.

Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Frederic Barrat
2018-01-23 12:31:42 +01:00
committed by Michael Ellerman
parent 5ef3166e8a
commit aeddad1760
8 changed files with 357 additions and 2 deletions
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9
include/uapi/misc/ocxl.h
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@@ -32,9 +32,18 @@ struct ocxl_ioctl_attach {
__u64 reserved3;
};
struct ocxl_ioctl_irq_fd {
__u64 irq_offset;
__s32 eventfd;
__u32 reserved;
};
/* ioctl numbers */
#define OCXL_MAGIC 0xCA
/* AFU devices */
#define OCXL_IOCTL_ATTACH _IOW(OCXL_MAGIC, 0x10, struct ocxl_ioctl_attach)
#define OCXL_IOCTL_IRQ_ALLOC _IOR(OCXL_MAGIC, 0x11, __u64)
#define OCXL_IOCTL_IRQ_FREE _IOW(OCXL_MAGIC, 0x12, __u64)
#define OCXL_IOCTL_IRQ_SET_FD _IOW(OCXL_MAGIC, 0x13, struct ocxl_ioctl_irq_fd)
#endif /* _UAPI_MISC_OCXL_H */