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/*
* VMware VMCI Driver
*
* 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_QUEUE_PAIR_H_
#define _VMCI_QUEUE_PAIR_H_
#include <linux/vmw_vmci_defs.h>
#include <linux/types.h>
#include "vmci_context.h"
/* Callback needed for correctly waiting on events. */
typedef int (*vmci_event_release_cb) (void *client_data);
/* Guest device port I/O. */
struct ppn_set {
u64 num_produce_pages;
u64 num_consume_pages;
u32 *produce_ppns;
u32 *consume_ppns;
bool initialized;
};
/* VMCIqueue_pairAllocInfo */
struct vmci_qp_alloc_info {
struct vmci_handle handle;
u32 peer;
u32 flags;
u64 produce_size;
u64 consume_size;
u64 ppn_va; /* Start VA of queue pair PPNs. */
u64 num_ppns;
s32 result;
u32 version;
};
/* VMCIqueue_pairSetVAInfo */
struct vmci_qp_set_va_info {
struct vmci_handle handle;
u64 va; /* Start VA of queue pair PPNs. */
u64 num_ppns;
u32 version;
s32 result;
};
/*
* For backwards compatibility, here is a version of the
* VMCIqueue_pairPageFileInfo before host support end-points was added.
* Note that the current version of that structure requires VMX to
* pass down the VA of the mapped file. Before host support was added
* there was nothing of the sort. So, when the driver sees the ioctl
* with a parameter that is the sizeof
* VMCIqueue_pairPageFileInfo_NoHostQP then it can infer that the version
* of VMX running can't attach to host end points because it doesn't
* provide the VA of the mapped files.
*
* The Linux driver doesn't get an indication of the size of the
* structure passed down from user space. So, to fix a long standing
* but unfiled bug, the _pad field has been renamed to version.
* Existing versions of VMX always initialize the PageFileInfo
* structure so that _pad, er, version is set to 0.
*
* A version value of 1 indicates that the size of the structure has
* been increased to include two UVA's: produce_uva and consume_uva.
* These UVA's are of the mmap()'d queue contents backing files.
*
* In addition, if when VMX is sending down the
* VMCIqueue_pairPageFileInfo structure it gets an error then it will
* try again with the _NoHostQP version of the file to see if an older
* VMCI kernel module is running.
*/
/* VMCIqueue_pairPageFileInfo */
struct vmci_qp_page_file_info {
struct vmci_handle handle;
u64 produce_page_file; /* User VA. */
u64 consume_page_file; /* User VA. */
u64 produce_page_file_size; /* Size of the file name array. */
u64 consume_page_file_size; /* Size of the file name array. */
s32 result;
u32 version; /* Was _pad. */
u64 produce_va; /* User VA of the mapped file. */
u64 consume_va; /* User VA of the mapped file. */
};
/* vmci queuepair detach info */
struct vmci_qp_dtch_info {
struct vmci_handle handle;
s32 result;
u32 _pad;
};
/*
* struct vmci_qp_page_store describes how the memory of a given queue pair
* is backed. When the queue pair is between the host and a guest, the
* page store consists of references to the guest pages. On vmkernel,
* this is a list of PPNs, and on hosted, it is a user VA where the
* queue pair is mapped into the VMX address space.
*/
struct vmci_qp_page_store {
/* Reference to pages backing the queue pair. */
u64 pages;
/* Length of pageList/virtual addres range (in pages). */
u32 len;
};
/*
* This data type contains the information about a queue.
* There are two queues (hence, queue pairs) per transaction model between a
* pair of end points, A & B. One queue is used by end point A to transmit
* commands and responses to B. The other queue is used by B to transmit
* commands and responses.
*
* struct vmci_queue_kern_if is a per-OS defined Queue structure. It contains
* either a direct pointer to the linear address of the buffer contents or a
* pointer to structures which help the OS locate those data pages. See
* vmciKernelIf.c for each platform for its definition.
*/
struct vmci_queue {
struct vmci_queue_header *q_header;
struct vmci_queue_header *saved_header;
struct vmci_queue_kern_if *kernel_if;
};
/*
* Utility function that checks whether the fields of the page
* store contain valid values.
* Result:
* true if the page store is wellformed. false otherwise.
*/
static inline bool
VMCI_QP_PAGESTORE_IS_WELLFORMED(struct vmci_qp_page_store *page_store)
{
return page_store->len >= 2;
}
/*
* Helper function to check if the non-blocking flag
* is set for a given queue pair.
*/
static inline bool vmci_can_block(u32 flags)
{
return !(flags & VMCI_QPFLAG_NONBLOCK);
}
/*
* Helper function to check if the queue pair is pinned
* into memory.
*/
static inline bool vmci_qp_pinned(u32 flags)
{
return flags & VMCI_QPFLAG_PINNED;
}
void vmci_qp_broker_exit(void);
int vmci_qp_broker_alloc(struct vmci_handle handle, u32 peer,
u32 flags, u32 priv_flags,
u64 produce_size, u64 consume_size,
struct vmci_qp_page_store *page_store,
struct vmci_ctx *context);
int vmci_qp_broker_set_page_store(struct vmci_handle handle,
u64 produce_uva, u64 consume_uva,
struct vmci_ctx *context);
int vmci_qp_broker_detach(struct vmci_handle handle, struct vmci_ctx *context);
void vmci_qp_guest_endpoints_exit(void);
int vmci_qp_alloc(struct vmci_handle *handle,
struct vmci_queue **produce_q, u64 produce_size,
struct vmci_queue **consume_q, u64 consume_size,
u32 peer, u32 flags, u32 priv_flags,
bool guest_endpoint, vmci_event_release_cb wakeup_cb,
void *client_data);
int vmci_qp_broker_map(struct vmci_handle handle,
struct vmci_ctx *context, u64 guest_mem);
int vmci_qp_broker_unmap(struct vmci_handle handle,
struct vmci_ctx *context, u32 gid);
#endif /* _VMCI_QUEUE_PAIR_H_ */
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