/**************************************************************************/ /*!
@File
@Title          PowerVR SrvKM cleanup thread deferred work interface
@Copyright      Copyright (c) Imagination Technologies Ltd. All Rights Reserved
@License        Dual MIT/GPLv2

The contents of this file are subject to the MIT license as set out below.

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*/ /***************************************************************************/

#ifndef _PVRSRV_CLEANUP_H
#define _PVRSRV_CLEANUP_H

#include "dllist.h"

/**************************************************************************/ /*!
@Brief          CLEANUP_THREAD_FN

@Description    This is the function prototype for the pfnFree member found in
                the structure PVRSRV_CLEANUP_THREAD_WORK. The function is
                responsible for carrying out the clean up work and if successful
                freeing the memory originally supplied to the call
                PVRSRVCleanupThreadAddWork().

@Input          pvParam  This is private data originally supplied by the caller
                         to PVRSRVCleanupThreadAddWork() when registering the
                         clean up work item, psDAta->pvData. Itr can be cast
                         to a relevant type within the using module.

@Return         PVRSRV_OK if the cleanup operation was successful and the
                callback has freed the PVRSRV_CLEANUP_THREAD_WORK* work item
                memory original supplied to PVRSRVCleanupThreadAddWork()
                Any other error code will lead to the work item
                being re-queued and hence the original
                PVRSRV_CLEANUP_THREAD_WORK* must not be freed.
*/ /***************************************************************************/

typedef PVRSRV_ERROR (*CLEANUP_THREAD_FN)(void *pvParam);


/* Typical number of times a caller should want the work to be retried in case
 * of the callback function (pfnFree) returning an error.
 * Callers to PVRSRVCleanupThreadAddWork should provide this value as the retry
 * count (ui32RetryCount) unless there are special requirements.
 * A value of 200 corresponds to around ~20s (200 * 100ms). If it is not
 * successful by then give up as an unrecoverable problem has occurred.
 */
#define CLEANUP_THREAD_RETRY_COUNT_DEFAULT 200u
/* Like for CLEANUP_THREAD_RETRY_COUNT_DEFAULT but call will wait for
 * a specified amount of time rather than number of retries.
 */
#define CLEANUP_THREAD_RETRY_TIMEOUT_MS_DEFAULT 20000u /* 20s */

/* Use to set retry count on a cleanup item.
 * _item - pointer to the PVRSRV_CLEANUP_THREAD_WORK
 * _count - retry count
 */
#define CLEANUP_THREAD_SET_RETRY_COUNT(_item,_count) \
	do { \
		(_item)->ui32RetryCount = (_count); \
		(_item)->ui32TimeStart = 0; \
		(_item)->ui32TimeEnd = 0; \
	} while (0)

/* Use to set timeout deadline on a cleanup item.
 * _item - pointer to the PVRSRV_CLEANUP_THREAD_WORK
 * _timeout - timeout in milliseconds, if 0
 *            CLEANUP_THREAD_RETRY_TIMEOUT_MS_DEFAULT is used
 */
#define CLEANUP_THREAD_SET_RETRY_TIMEOUT(_item,_timeout) \
	do { \
		(_item)->ui32RetryCount = 0; \
		(_item)->ui32TimeStart = OSClockms(); \
		(_item)->ui32TimeEnd = (_item)->ui32TimeStart + ((_timeout) > 0 ? \
				(_timeout) : CLEANUP_THREAD_RETRY_TIMEOUT_MS_DEFAULT); \
	} while (0)

/* Indicates if the timeout on a given item has been reached.
 * _item - pointer to the PVRSRV_CLEANUP_THREAD_WORK
 */
#define CLEANUP_THREAD_RETRY_TIMEOUT_REACHED(_item) \
	((_item)->ui32TimeEnd - (_item)->ui32TimeStart >= \
			OSClockms() - (_item)->ui32TimeStart)

/* Indicates if the current item is waiting on timeout or retry count.
 * _item - pointer to the PVRSRV_CLEANUP_THREAD_WORK
 * */
#define CLEANUP_THREAD_IS_RETRY_TIMEOUT(_item) \
	((_item)->ui32TimeStart != (_item->ui32TimeEnd))

/* Clean up work item specifics so that the task can be managed by the
 * pvr_defer_free cleanup thread in the Server.
 */
typedef struct _PVRSRV_CLEANUP_THREAD_WORK_
{
	DLLIST_NODE sNode;             /*!< List node used internally by the cleanup
	                                    thread */
	CLEANUP_THREAD_FN pfnFree;     /*!< Pointer to the function to be called to
	                                    carry out the deferred cleanup */
	void *pvData;                  /*!< private data for pfnFree, usually a way back
	                                    to the original PVRSRV_CLEANUP_THREAD_WORK*
	                                    pointer supplied in the call to
	                                    PVRSRVCleanupThreadAddWork(). */
	IMG_UINT32 ui32TimeStart;      /*!< Timestamp in ms of the moment when
	                                    cleanup item has been created. */
	IMG_UINT32 ui32TimeEnd;        /*!< Time in ms after which no further retry
	                                    attempts will be made, item discard and
	                                    error logged when this is reached. */
	IMG_UINT32 ui32RetryCount;     /*!< Number of times the callback should be
	                                    re-tried when it returns error. */
	IMG_BOOL bDependsOnHW;         /*!< Retry again after the RGX interrupt signals
	                                    the global event object */
} PVRSRV_CLEANUP_THREAD_WORK;


/**************************************************************************/ /*!
@Function       PVRSRVCleanupThreadAddWork

@Description    Add a work item to be called from the cleanup thread

@Input          psData : The function pointer and private data for the callback

@Return         None
*/ /***************************************************************************/
void PVRSRVCleanupThreadAddWork(PVRSRV_CLEANUP_THREAD_WORK *psData);

#endif /* _PVRSRV_CLEANUP_H */