424788cfe0
The Driver Synchronization Core (DSC) is a set of synchronization primitives for use by the driver's orchestration layer. It provides APIs for ensuring safe state transitions (including bring up and tear down) of major driver objects: a single driver, associated psocs, and their associated vdevs. APIs are divided into two categories: mutual exclusion of conflicting transitions, and operation tracking, blocking, and waiting capabilities. For part 1, add common infrastructure and headers. Change-Id: Id290e66d2dccd28b89fed5f285d3692ff3c814e7 CRs-Fixed: 2290260
56 line
2.4 KiB
C
56 line
2.4 KiB
C
/*
|
|
* Copyright (c) 2018 The Linux Foundation. All rights reserved.
|
|
*
|
|
* Permission to use, copy, modify, and/or distribute this software for
|
|
* any purpose with or without fee is hereby granted, provided that the
|
|
* above copyright notice and this permission notice appear in all
|
|
* copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
|
|
* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
|
|
* AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
|
|
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
|
|
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
|
|
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
|
* PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
/**
|
|
* DOC: Driver Synchronization Core (DSC) APIs for use by the driver
|
|
* orchestration layer.
|
|
*
|
|
* This infrastructure accomplishes two high level goals:
|
|
* 1) Replace ad-hoc locking/flags (hdd_init_deinit_lock,
|
|
* iface_change_lock, con_mode_flag, etc., etc., etc.)
|
|
* 2) Make cds_ssr_protect() and driver state checking atomic
|
|
*
|
|
* These two goals are commplished in DSC via two corollary concepts:
|
|
* 1) Transitions (as in driver state machine transitions)
|
|
* These are mutually exclusive, and replace ad-hoc locking
|
|
* 2) Operations (as in operations the driver is currently servicing)
|
|
* These execute concurrently with other operations, and replace
|
|
* cds_ssr_protect(). Any active transition causes new operations to be
|
|
* rejected, in the same way as cds_ssr_protect/hdd_validate_context would.
|
|
*
|
|
* Transitions and operations are split into 3 distinct levels: driver, psoc,
|
|
* and vdev. These levels are arranged into a tree, with a single driver at
|
|
* the root, zero or more psocs per driver, and zero or more vdevs per psoc.
|
|
*
|
|
* High level transitions block transitions and operations at the same level
|
|
* down, and low level transitions block transitions at the same level up. So a
|
|
* driver transition effectively prevents any new activity in the system, while
|
|
* a vdev transition prevents transtitions on the same vdev, its parent psoc,
|
|
* and the driver. This also means that sibling nodes can transition at the same
|
|
* time, e.g. one vdev going up at the same time another is going down.
|
|
*/
|
|
|
|
#ifndef __WLAN_DSC_H
|
|
#define __WLAN_DSC_H
|
|
|
|
#include "wlan_dsc_driver.h"
|
|
#include "wlan_dsc_psoc.h"
|
|
#include "wlan_dsc_vdev.h"
|
|
|
|
#endif /* __WLAN_DSC_H */
|