vmci_context.h
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/*
* VMware VMCI driver (vmciContext.h)
*
* Copyright (C) 2012 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 and no later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#ifndef _VMCI_CONTEXT_H_
#define _VMCI_CONTEXT_H_
#include <linux/vmw_vmci_defs.h>
#include <linux/atomic.h>
#include <linux/kref.h>
#include <linux/types.h>
#include <linux/wait.h>
#include "vmci_handle_array.h"
#include "vmci_datagram.h"
/* Used to determine what checkpoint state to get and set. */
enum {
VMCI_NOTIFICATION_CPT_STATE = 1,
VMCI_WELLKNOWN_CPT_STATE = 2,
VMCI_DG_OUT_STATE = 3,
VMCI_DG_IN_STATE = 4,
VMCI_DG_IN_SIZE_STATE = 5,
VMCI_DOORBELL_CPT_STATE = 6,
};
/* Host specific struct used for signalling */
struct vmci_host {
wait_queue_head_t wait_queue;
};
struct vmci_handle_list {
struct list_head node;
struct vmci_handle handle;
};
struct vmci_ctx {
struct list_head list_item; /* For global VMCI list. */
u32 cid;
struct kref kref;
struct list_head datagram_queue; /* Head of per VM queue. */
u32 pending_datagrams;
size_t datagram_queue_size; /* Size of datagram queue in bytes. */
/*
* Version of the code that created
* this context; e.g., VMX.
*/
int user_version;
spinlock_t lock; /* Locks callQueue and handle_arrays. */
/*
* queue_pairs attached to. The array of
* handles for queue pairs is accessed
* from the code for QP API, and there
* it is protected by the QP lock. It
* is also accessed from the context
* clean up path, which does not
* require a lock. VMCILock is not
* used to protect the QP array field.
*/
struct vmci_handle_arr *queue_pair_array;
/* Doorbells created by context. */
struct vmci_handle_arr *doorbell_array;
/* Doorbells pending for context. */
struct vmci_handle_arr *pending_doorbell_array;
/* Contexts current context is subscribing to. */
struct list_head notifier_list;
unsigned int n_notifiers;
struct vmci_host host_context;
u32 priv_flags;
const struct cred *cred;
bool *notify; /* Notify flag pointer - hosted only. */
struct page *notify_page; /* Page backing the notify UVA. */
};
/* VMCINotifyAddRemoveInfo: Used to add/remove remote context notifications. */
struct vmci_ctx_info {
u32 remote_cid;
int result;
};
/* VMCICptBufInfo: Used to set/get current context's checkpoint state. */
struct vmci_ctx_chkpt_buf_info {
u64 cpt_buf;
u32 cpt_type;
u32 buf_size;
s32 result;
u32 _pad;
};
/*
* VMCINotificationReceiveInfo: Used to recieve pending notifications
* for doorbells and queue pairs.
*/
struct vmci_ctx_notify_recv_info {
u64 db_handle_buf_uva;
u64 db_handle_buf_size;
u64 qp_handle_buf_uva;
u64 qp_handle_buf_size;
s32 result;
u32 _pad;
};
/*
* Utilility function that checks whether two entities are allowed
* to interact. If one of them is restricted, the other one must
* be trusted.
*/
static inline bool vmci_deny_interaction(u32 part_one, u32 part_two)
{
return ((part_one & VMCI_PRIVILEGE_FLAG_RESTRICTED) &&
!(part_two & VMCI_PRIVILEGE_FLAG_TRUSTED)) ||
((part_two & VMCI_PRIVILEGE_FLAG_RESTRICTED) &&
!(part_one & VMCI_PRIVILEGE_FLAG_TRUSTED));
}
struct vmci_ctx *vmci_ctx_create(u32 cid, u32 flags,
uintptr_t event_hnd, int version,
const struct cred *cred);
void vmci_ctx_destroy(struct vmci_ctx *context);
bool vmci_ctx_supports_host_qp(struct vmci_ctx *context);
int vmci_ctx_enqueue_datagram(u32 cid, struct vmci_datagram *dg);
int vmci_ctx_dequeue_datagram(struct vmci_ctx *context,
size_t *max_size, struct vmci_datagram **dg);
int vmci_ctx_pending_datagrams(u32 cid, u32 *pending);
struct vmci_ctx *vmci_ctx_get(u32 cid);
void vmci_ctx_put(struct vmci_ctx *context);
bool vmci_ctx_exists(u32 cid);
int vmci_ctx_add_notification(u32 context_id, u32 remote_cid);
int vmci_ctx_remove_notification(u32 context_id, u32 remote_cid);
int vmci_ctx_get_chkpt_state(u32 context_id, u32 cpt_type,
u32 *num_cids, void **cpt_buf_ptr);
int vmci_ctx_set_chkpt_state(u32 context_id, u32 cpt_type,
u32 num_cids, void *cpt_buf);
int vmci_ctx_qp_create(struct vmci_ctx *context, struct vmci_handle handle);
int vmci_ctx_qp_destroy(struct vmci_ctx *context, struct vmci_handle handle);
bool vmci_ctx_qp_exists(struct vmci_ctx *context, struct vmci_handle handle);
void vmci_ctx_check_signal_notify(struct vmci_ctx *context);
void vmci_ctx_unset_notify(struct vmci_ctx *context);
int vmci_ctx_dbell_create(u32 context_id, struct vmci_handle handle);
int vmci_ctx_dbell_destroy(u32 context_id, struct vmci_handle handle);
int vmci_ctx_dbell_destroy_all(u32 context_id);
int vmci_ctx_notify_dbell(u32 cid, struct vmci_handle handle,
u32 src_priv_flags);
int vmci_ctx_rcv_notifications_get(u32 context_id, struct vmci_handle_arr
**db_handle_array, struct vmci_handle_arr
**qp_handle_array);
void vmci_ctx_rcv_notifications_release(u32 context_id, struct vmci_handle_arr
*db_handle_array, struct vmci_handle_arr
*qp_handle_array, bool success);
static inline u32 vmci_ctx_get_id(struct vmci_ctx *context)
{
if (!context)
return VMCI_INVALID_ID;
return context->cid;
}
#endif /* _VMCI_CONTEXT_H_ */