mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 16:01:14 +07:00
bdc612dc69
This ioctl allows the users of a shared page to be notified when the other end exits abnormally. [v2: updated description in structs] Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
/******************************************************************************
|
|
* gntalloc.h
|
|
*
|
|
* Interface to /dev/xen/gntalloc.
|
|
*
|
|
* Author: Daniel De Graaf <dgdegra@tycho.nsa.gov>
|
|
*
|
|
* This file is in the public domain.
|
|
*/
|
|
|
|
#ifndef __LINUX_PUBLIC_GNTALLOC_H__
|
|
#define __LINUX_PUBLIC_GNTALLOC_H__
|
|
|
|
/*
|
|
* Allocates a new page and creates a new grant reference.
|
|
*/
|
|
#define IOCTL_GNTALLOC_ALLOC_GREF \
|
|
_IOC(_IOC_NONE, 'G', 5, sizeof(struct ioctl_gntalloc_alloc_gref))
|
|
struct ioctl_gntalloc_alloc_gref {
|
|
/* IN parameters */
|
|
/* The ID of the domain to be given access to the grants. */
|
|
uint16_t domid;
|
|
/* Flags for this mapping */
|
|
uint16_t flags;
|
|
/* Number of pages to map */
|
|
uint32_t count;
|
|
/* OUT parameters */
|
|
/* The offset to be used on a subsequent call to mmap(). */
|
|
uint64_t index;
|
|
/* The grant references of the newly created grant, one per page */
|
|
/* Variable size, depending on count */
|
|
uint32_t gref_ids[1];
|
|
};
|
|
|
|
#define GNTALLOC_FLAG_WRITABLE 1
|
|
|
|
/*
|
|
* Deallocates the grant reference, allowing the associated page to be freed if
|
|
* no other domains are using it.
|
|
*/
|
|
#define IOCTL_GNTALLOC_DEALLOC_GREF \
|
|
_IOC(_IOC_NONE, 'G', 6, sizeof(struct ioctl_gntalloc_dealloc_gref))
|
|
struct ioctl_gntalloc_dealloc_gref {
|
|
/* IN parameters */
|
|
/* The offset returned in the map operation */
|
|
uint64_t index;
|
|
/* Number of references to unmap */
|
|
uint32_t count;
|
|
};
|
|
|
|
/*
|
|
* Sets up an unmap notification within the page, so that the other side can do
|
|
* cleanup if this side crashes. Required to implement cross-domain robust
|
|
* mutexes or close notification on communication channels.
|
|
*
|
|
* Each mapped page only supports one notification; multiple calls referring to
|
|
* the same page overwrite the previous notification. You must clear the
|
|
* notification prior to the IOCTL_GNTALLOC_DEALLOC_GREF if you do not want it
|
|
* to occur.
|
|
*/
|
|
#define IOCTL_GNTALLOC_SET_UNMAP_NOTIFY \
|
|
_IOC(_IOC_NONE, 'G', 7, sizeof(struct ioctl_gntalloc_unmap_notify))
|
|
struct ioctl_gntalloc_unmap_notify {
|
|
/* IN parameters */
|
|
/* Offset in the file descriptor for a byte within the page (same as
|
|
* used in mmap). If using UNMAP_NOTIFY_CLEAR_BYTE, this is the byte to
|
|
* be cleared. Otherwise, it can be any byte in the page whose
|
|
* notification we are adjusting.
|
|
*/
|
|
uint64_t index;
|
|
/* Action(s) to take on unmap */
|
|
uint32_t action;
|
|
/* Event channel to notify */
|
|
uint32_t event_channel_port;
|
|
};
|
|
|
|
/* Clear (set to zero) the byte specified by index */
|
|
#define UNMAP_NOTIFY_CLEAR_BYTE 0x1
|
|
/* Send an interrupt on the indicated event channel */
|
|
#define UNMAP_NOTIFY_SEND_EVENT 0x2
|
|
|
|
#endif /* __LINUX_PUBLIC_GNTALLOC_H__ */
|