thead-kernel/drivers/gpu/drm/img-rogue/pvrsrv_pool.c

/**************************************************************************/ /*!
@File
@Title          Services pool implementation
@Copyright      Copyright (c) Imagination Technologies Ltd. All Rights Reserved
@Description    Provides a generic pool implementation
@License        Dual MIT/GPLv2

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

#include "img_defs.h"
#include "pvr_debug.h"
#include "pvrsrv.h"
#include "lock.h"
#include "dllist.h"
#include "allocmem.h"

struct _PVRSRV_POOL_
{
	POS_LOCK hLock;
	/* total max number of permitted entries in the pool */
	IMG_UINT uiMaxEntries;
	/* currently number of pool entries created. these may be in the pool
	 * or in-use
	 */
	IMG_UINT uiNumBusy;
	/* number of not-in-use entries currently free in the pool */
	IMG_UINT uiNumFree;

	DLLIST_NODE sFreeList;

	const IMG_CHAR *pszName;

	PVRSRV_POOL_ALLOC_FUNC *pfnAlloc;
	PVRSRV_POOL_FREE_FUNC *pfnFree;
	void *pvPrivData;
};

typedef struct _PVRSRV_POOL_ENTRY_
{
	DLLIST_NODE sNode;
	void *pvData;
} PVRSRV_POOL_ENTRY;

PVRSRV_ERROR PVRSRVPoolCreate(PVRSRV_POOL_ALLOC_FUNC *pfnAlloc,
					PVRSRV_POOL_FREE_FUNC *pfnFree,
					IMG_UINT32 ui32MaxEntries,
					const IMG_CHAR *pszName,
					void *pvPrivData,
					PVRSRV_POOL **ppsPool)
{
	PVRSRV_POOL *psPool;
	PVRSRV_ERROR eError;

	psPool = OSAllocMem(sizeof(PVRSRV_POOL));
	PVR_GOTO_IF_NOMEM(psPool, eError, err_alloc);

	eError = OSLockCreate(&psPool->hLock);

	PVR_GOTO_IF_ERROR(eError, err_lock_create);

	psPool->uiMaxEntries = ui32MaxEntries;
	psPool->uiNumBusy = 0;
	psPool->uiNumFree = 0;
	psPool->pfnAlloc = pfnAlloc;
	psPool->pfnFree = pfnFree;
	psPool->pvPrivData = pvPrivData;
	psPool->pszName = pszName;

	dllist_init(&psPool->sFreeList);

	*ppsPool = psPool;

	return PVRSRV_OK;

err_lock_create:
	OSFreeMem(psPool);
err_alloc:
	return eError;
}

static PVRSRV_ERROR _DestroyPoolEntry(PVRSRV_POOL *psPool,
					PVRSRV_POOL_ENTRY *psEntry)
{
	psPool->pfnFree(psPool->pvPrivData, psEntry->pvData);
	OSFreeMem(psEntry);

	return PVRSRV_OK;
}

void PVRSRVPoolDestroy(PVRSRV_POOL *psPool)
{
	if (psPool->uiNumBusy != 0)
	{
		PVR_DPF((PVR_DBG_ERROR, "%s: Attempt to destroy pool %s "
						"with %u entries still in use",
						__func__,
						psPool->pszName,
						psPool->uiNumBusy));
		return;
	}

	OSLockDestroy(psPool->hLock);

	if (psPool->uiNumFree)
	{
		PVRSRV_POOL_ENTRY *psEntry;
		DLLIST_NODE *psChosenNode;

		psChosenNode = dllist_get_next_node(&psPool->sFreeList);

		while (psChosenNode)
		{
			dllist_remove_node(psChosenNode);

			psEntry = IMG_CONTAINER_OF(psChosenNode, PVRSRV_POOL_ENTRY, sNode);
			_DestroyPoolEntry(psPool, psEntry);

			psPool->uiNumFree--;

			psChosenNode = dllist_get_next_node(&psPool->sFreeList);
		}

		PVR_ASSERT(psPool->uiNumFree == 0);
	}

	OSFreeMem(psPool);
}

static PVRSRV_ERROR _CreateNewPoolEntry(PVRSRV_POOL *psPool,
					PVRSRV_POOL_ENTRY **ppsEntry)
{
	PVRSRV_POOL_ENTRY *psNewEntry;
	PVRSRV_ERROR eError;

	psNewEntry = OSAllocMem(sizeof(PVRSRV_POOL_ENTRY));
	PVR_GOTO_IF_NOMEM(psNewEntry, eError, err_allocmem);

	dllist_init(&psNewEntry->sNode);

	eError = psPool->pfnAlloc(psPool->pvPrivData, &psNewEntry->pvData);

	PVR_GOTO_IF_ERROR(eError, err_pfn_alloc);

	*ppsEntry = psNewEntry;

	return PVRSRV_OK;

err_pfn_alloc:
	OSFreeMem(psNewEntry);
err_allocmem:
	return eError;
}

PVRSRV_ERROR PVRSRVPoolGet(PVRSRV_POOL *psPool,
					PVRSRV_POOL_TOKEN *hToken,
					void **ppvDataOut)
{
	PVRSRV_POOL_ENTRY *psEntry;
	PVRSRV_ERROR eError = PVRSRV_OK;
	DLLIST_NODE *psChosenNode;

	OSLockAcquire(psPool->hLock);

	psChosenNode = dllist_get_next_node(&psPool->sFreeList);
	if (unlikely(psChosenNode == NULL))
	{
		/* no available elements in the pool. try to create one */

		eError = _CreateNewPoolEntry(psPool, &psEntry);

		PVR_GOTO_IF_ERROR(eError, out_unlock);
	}
	else
	{
		dllist_remove_node(psChosenNode);

		psEntry = IMG_CONTAINER_OF(psChosenNode, PVRSRV_POOL_ENTRY, sNode);

		psPool->uiNumFree--;
	}

#if defined(DEBUG) || defined(SUPPORT_VALIDATION)
	/* Don't poison the IN buffer as that is copied from client and would be
	 * waste of cycles.
	 */
	OSCachedMemSet(((IMG_PBYTE)psEntry->pvData)+PVRSRV_MAX_BRIDGE_IN_SIZE,
			PVRSRV_POISON_ON_ALLOC_VALUE, PVRSRV_MAX_BRIDGE_OUT_SIZE);
#endif

	psPool->uiNumBusy++;
	*hToken = psEntry;
	*ppvDataOut = psEntry->pvData;

out_unlock:
	OSLockRelease(psPool->hLock);
	return eError;
}

PVRSRV_ERROR PVRSRVPoolPut(PVRSRV_POOL *psPool, PVRSRV_POOL_TOKEN hToken)
{
	PVRSRV_ERROR eError = PVRSRV_OK;
	PVRSRV_POOL_ENTRY *psEntry = hToken;

	PVR_ASSERT(psPool->uiNumBusy > 0);

	OSLockAcquire(psPool->hLock);

	/* put this entry in the pool if the pool has space,
	 * otherwise free it
	 */
	if (psPool->uiNumFree < psPool->uiMaxEntries)
	{
		dllist_add_to_tail(&psPool->sFreeList, &psEntry->sNode);
		psPool->uiNumFree++;
	}
	else
	{
		eError = _DestroyPoolEntry(psPool, psEntry);
	}

	psPool->uiNumBusy--;

	OSLockRelease(psPool->hLock);

	return eError;
}