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104 lines
5.1 KiB
C
104 lines
5.1 KiB
C
/*************************************************************************/ /*!
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@File
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@Title PVR Bridge Module (kernel side)
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@Copyright Copyright (c) Imagination Technologies Ltd. All Rights Reserved
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@Description Receives calls from the user portion of services and
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despatches them to functions in the kernel portion.
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@License Dual MIT/GPLv2
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The contents of this file are subject to the MIT license as set out below.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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Alternatively, the contents of this file may be used under the terms of
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the GNU General Public License Version 2 ("GPL") in which case the provisions
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of GPL are applicable instead of those above.
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If you wish to allow use of your version of this file only under the terms of
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GPL, and not to allow others to use your version of this file under the terms
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of the MIT license, indicate your decision by deleting the provisions above
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and replace them with the notice and other provisions required by GPL as set
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out in the file called "GPL-COPYING" included in this distribution. If you do
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not delete the provisions above, a recipient may use your version of this file
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under the terms of either the MIT license or GPL.
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This License is also included in this distribution in the file called
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"MIT-COPYING".
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EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS
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PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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PURPOSE AND NONINFRINGEMENT; AND (B) IN NO EVENT SHALL THE AUTHORS OR
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/ /**************************************************************************/
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#ifndef PVR_BRIDGE_K_H
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#define PVR_BRIDGE_K_H
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#include "pvrsrv_error.h"
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/*!
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******************************************************************************
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@Function LinuxBridgeBlockClientsAccess
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@Description This function will wait for any existing threads in the Server
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to exit and then disable access to the driver. New threads will
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not be allowed to enter the Server until the driver is
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unsuspended (see LinuxBridgeUnblockClientsAccess).
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@Input bShutdown this flag indicates that the function was called
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from a shutdown callback and therefore it will
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not wait for the kernel threads to get frozen
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(because this doesn't happen during shutdown
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procedure)
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@Return PVRSRV_ERROR
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******************************************************************************/
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PVRSRV_ERROR LinuxBridgeBlockClientsAccess(IMG_BOOL bShutdown);
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/*!
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******************************************************************************
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@Function LinuxBridgeUnblockClientsAccess
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@Description This function will re-enable the bridge and allow any threads
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waiting to enter the Server to continue.
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@Return PVRSRV_ERROR
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******************************************************************************/
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PVRSRV_ERROR LinuxBridgeUnblockClientsAccess(void);
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void LinuxBridgeNumActiveKernelThreadsIncrement(void);
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void LinuxBridgeNumActiveKernelThreadsDecrement(void);
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/*!
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******************************************************************************
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@Function PVRSRVDriverThreadEnter
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@Description Increments number of client threads currently operating
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in the driver's context.
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If the driver is currently being suspended this function
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will call try_to_freeze() on behalf of the client thread.
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When the driver is resumed the function will exit and allow
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the thread into the driver.
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@Return PVRSRV_ERROR
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******************************************************************************/
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PVRSRV_ERROR PVRSRVDriverThreadEnter(void);
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/*!
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******************************************************************************
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@Function PVRSRVDriverThreadExit
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@Description Decrements the number of client threads currently operating
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in the driver's context to match the call to
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PVRSRVDriverThreadEnter().
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The function also signals the driver that a thread left the
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driver context so if it's waiting to suspend it knows that
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the number of threads decreased.
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******************************************************************************/
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void PVRSRVDriverThreadExit(void);
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#endif /* PVR_BRIDGE_K_H */
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