forked from luck/tmp_suning_uos_patched
VMCI: queue pairs implementation.
VMCI queue pairs allow for bi-directional ordered communication between host and guests. Signed-off-by: George Zhang <georgezhang@vmware.com> Acked-by: Andy king <acking@vmware.com> Acked-by: Dmitry Torokhov <dtor@vmware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
George Zhang
Greg Kroah-Hartman
parent
b484b26cc7
commit
06164d2b72
3420
drivers/misc/vmw_vmci/vmci_queue_pair.c
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3420
drivers/misc/vmw_vmci/vmci_queue_pair.c
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drivers/misc/vmw_vmci/vmci_queue_pair.h
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drivers/misc/vmw_vmci/vmci_queue_pair.h
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/*
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* VMware VMCI Driver
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*
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* Copyright (C) 2012 VMware, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 and no later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#ifndef _VMCI_QUEUE_PAIR_H_
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#define _VMCI_QUEUE_PAIR_H_
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#include <linux/vmw_vmci_defs.h>
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#include <linux/types.h>
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#include "vmci_context.h"
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/* Callback needed for correctly waiting on events. */
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typedef int (*vmci_event_release_cb) (void *client_data);
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/* Guest device port I/O. */
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struct PPNSet {
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u64 num_produce_pages;
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u64 num_consume_pages;
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u32 *produce_ppns;
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u32 *consume_ppns;
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bool initialized;
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};
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/* VMCIqueue_pairAllocInfo */
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struct vmci_qp_alloc_info {
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struct vmci_handle handle;
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u32 peer;
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u32 flags;
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u64 produce_size;
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u64 consume_size;
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u64 ppn_va; /* Start VA of queue pair PPNs. */
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u64 num_ppns;
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s32 result;
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u32 version;
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};
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/* VMCIqueue_pairSetVAInfo */
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struct vmci_qp_set_va_info {
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struct vmci_handle handle;
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u64 va; /* Start VA of queue pair PPNs. */
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u64 num_ppns;
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u32 version;
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s32 result;
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};
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/*
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* For backwards compatibility, here is a version of the
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* VMCIqueue_pairPageFileInfo before host support end-points was added.
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* Note that the current version of that structure requires VMX to
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* pass down the VA of the mapped file. Before host support was added
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* there was nothing of the sort. So, when the driver sees the ioctl
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* with a parameter that is the sizeof
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* VMCIqueue_pairPageFileInfo_NoHostQP then it can infer that the version
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* of VMX running can't attach to host end points because it doesn't
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* provide the VA of the mapped files.
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*
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* The Linux driver doesn't get an indication of the size of the
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* structure passed down from user space. So, to fix a long standing
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* but unfiled bug, the _pad field has been renamed to version.
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* Existing versions of VMX always initialize the PageFileInfo
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* structure so that _pad, er, version is set to 0.
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*
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* A version value of 1 indicates that the size of the structure has
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* been increased to include two UVA's: produce_uva and consume_uva.
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* These UVA's are of the mmap()'d queue contents backing files.
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*
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* In addition, if when VMX is sending down the
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* VMCIqueue_pairPageFileInfo structure it gets an error then it will
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* try again with the _NoHostQP version of the file to see if an older
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* VMCI kernel module is running.
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*/
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/* VMCIqueue_pairPageFileInfo */
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struct vmci_qp_page_file_info {
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struct vmci_handle handle;
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u64 produce_page_file; /* User VA. */
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u64 consume_page_file; /* User VA. */
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u64 produce_page_file_size; /* Size of the file name array. */
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u64 consume_page_file_size; /* Size of the file name array. */
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s32 result;
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u32 version; /* Was _pad. */
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u64 produce_va; /* User VA of the mapped file. */
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u64 consume_va; /* User VA of the mapped file. */
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};
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/* vmci queuepair detach info */
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struct vmci_qp_dtch_info {
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struct vmci_handle handle;
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s32 result;
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u32 _pad;
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};
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/*
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* struct vmci_qp_page_store describes how the memory of a given queue pair
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* is backed. When the queue pair is between the host and a guest, the
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* page store consists of references to the guest pages. On vmkernel,
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* this is a list of PPNs, and on hosted, it is a user VA where the
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* queue pair is mapped into the VMX address space.
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*/
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struct vmci_qp_page_store {
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/* Reference to pages backing the queue pair. */
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u64 pages;
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/* Length of pageList/virtual addres range (in pages). */
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u32 len;
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};
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/*
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* This data type contains the information about a queue.
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* There are two queues (hence, queue pairs) per transaction model between a
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* pair of end points, A & B. One queue is used by end point A to transmit
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* commands and responses to B. The other queue is used by B to transmit
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* commands and responses.
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*
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* struct vmci_queue_kern_if is a per-OS defined Queue structure. It contains
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* either a direct pointer to the linear address of the buffer contents or a
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* pointer to structures which help the OS locate those data pages. See
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* vmciKernelIf.c for each platform for its definition.
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*/
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struct vmci_queue {
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struct vmci_queue_header *q_header;
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struct vmci_queue_header *saved_header;
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struct vmci_queue_kern_if *kernel_if;
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};
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/*
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* Utility function that checks whether the fields of the page
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* store contain valid values.
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* Result:
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* true if the page store is wellformed. false otherwise.
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*/
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static inline bool
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VMCI_QP_PAGESTORE_IS_WELLFORMED(struct vmci_qp_page_store *page_store)
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{
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return page_store->len >= 2;
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}
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/*
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* Helper function to check if the non-blocking flag
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* is set for a given queue pair.
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*/
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static inline bool vmci_can_block(u32 flags)
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{
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return !(flags & VMCI_QPFLAG_NONBLOCK);
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}
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/*
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* Helper function to check if the queue pair is pinned
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* into memory.
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*/
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static inline bool vmci_qp_pinned(u32 flags)
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{
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return flags & VMCI_QPFLAG_PINNED;
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}
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void vmci_qp_broker_exit(void);
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int vmci_qp_broker_alloc(struct vmci_handle handle, u32 peer,
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u32 flags, u32 priv_flags,
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u64 produce_size, u64 consume_size,
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struct vmci_qp_page_store *page_store,
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struct vmci_ctx *context);
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int vmci_qp_broker_set_page_store(struct vmci_handle handle,
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u64 produce_uva, u64 consume_uva,
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struct vmci_ctx *context);
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int vmci_qp_broker_detach(struct vmci_handle handle, struct vmci_ctx *context);
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void vmci_qp_guest_endpoints_exit(void);
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int vmci_qp_alloc(struct vmci_handle *handle,
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struct vmci_queue **produce_q, u64 produce_size,
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struct vmci_queue **consume_q, u64 consume_size,
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u32 peer, u32 flags, u32 priv_flags,
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bool guest_endpoint, vmci_event_release_cb wakeup_cb,
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void *client_data);
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int vmci_qp_broker_map(struct vmci_handle handle,
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struct vmci_ctx *context, u64 guest_mem);
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int vmci_qp_broker_unmap(struct vmci_handle handle,
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struct vmci_ctx *context, u32 gid);
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#endif /* _VMCI_QUEUE_PAIR_H_ */
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