/*************************************************************************/ /*!
@File           info_page_km.c
@Title          Kernel/User space shared memory
@Copyright      Copyright (c) Imagination Technologies Ltd. All Rights Reserved
@Description    Implements general purpose shared memory between kernel driver
                and user mode.
@License        Dual MIT/GPLv2

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

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of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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the GNU General Public License Version 2 ("GPL") in which case the provisions
of GPL are applicable instead of those above.

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and replace them with the notice and other provisions required by GPL as set
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not delete the provisions above, a recipient may use your version of this file
under the terms of either the MIT license or GPL.

This License is also included in this distribution in the file called
"MIT-COPYING".

EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS
PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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*/ /**************************************************************************/

#include "info_page_defs.h"
#include "info_page.h"
#include "pvrsrv.h"
#include "devicemem.h"
#include "pmr.h"

PVRSRV_ERROR InfoPageCreate(PVRSRV_DATA *psData)
{
    const DEVMEM_FLAGS_T uiMemFlags = PVRSRV_MEMALLOCFLAG_CPU_READABLE |
                                      PVRSRV_MEMALLOCFLAG_CPU_WRITEABLE |
                                      PVRSRV_MEMALLOCFLAG_ZERO_ON_ALLOC |
                                      PVRSRV_MEMALLOCFLAG_CPU_CACHE_INCOHERENT |
                                      PVRSRV_MEMALLOCFLAG_KERNEL_CPU_MAPPABLE |
                                      PVRSRV_MEMALLOCFLAG_CPU_LOCAL;
    PVRSRV_ERROR eError;

    PVR_ASSERT(psData != NULL);

    /* Allocate single page of memory for driver information page */
    eError = DevmemAllocateExportable(psData->psHostMemDeviceNode,
                                      OSGetPageSize(),
                                      OSGetPageSize(),
                                      OSGetPageShift(),
                                      uiMemFlags,
                                      "PVRSRVInfoPage",
                                      &psData->psInfoPageMemDesc);
    PVR_LOGG_IF_ERROR(eError, "DevmemAllocateExportable", e0);

    eError =  DevmemAcquireCpuVirtAddr(psData->psInfoPageMemDesc,
                                       (void **) &psData->pui32InfoPage);
    PVR_LOGG_IF_ERROR(eError, "DevmemAllocateExportable", e0);

    /* Look-up the memory descriptor PMR handle */
    eError = DevmemLocalGetImportHandle(psData->psInfoPageMemDesc,
                                        (void **) &psData->psInfoPagePMR);
    PVR_LOGG_IF_ERROR(eError, "DevmemLocalGetImportHandle", e0);

    eError = OSLockCreate(&psData->hInfoPageLock);
    PVR_LOGG_IF_ERROR(eError, "OSLockCreate", e0);

    return PVRSRV_OK;

e0:
    InfoPageDestroy(psData);
    return eError;
}

void InfoPageDestroy(PVRSRV_DATA *psData)
{
    if (psData->psInfoPageMemDesc)
    {
        if (psData->pui32InfoPage != NULL)
        {
            DevmemReleaseCpuVirtAddr(psData->psInfoPageMemDesc);
            psData->pui32InfoPage = NULL;
        }

        DevmemFree(psData->psInfoPageMemDesc);
        psData->psInfoPageMemDesc = NULL;
    }

    if (psData->hInfoPageLock)
    {
        OSLockDestroy(psData->hInfoPageLock);
        psData->hInfoPageLock = NULL;
    }
}

PVRSRV_ERROR PVRSRVAcquireInfoPageKM(PMR **ppsPMR)
{
    PVRSRV_DATA *psData = PVRSRVGetPVRSRVData();

    PVR_LOGR_IF_FALSE(psData->psInfoPageMemDesc != NULL, "invalid MEMDESC"
                      " handle", PVRSRV_ERROR_INVALID_PARAMS);
    PVR_LOGR_IF_FALSE(psData->psInfoPagePMR != NULL, "invalid PMR handle",
                      PVRSRV_ERROR_INVALID_PARAMS);

    /* Copy the PMR import handle back */
    *ppsPMR = psData->psInfoPagePMR;

    return PVRSRV_OK;
}

PVRSRV_ERROR PVRSRVReleaseInfoPageKM(PMR *ppsPMR)
{
    /* Nothing to do here as PMR is singleton */
    PVR_UNREFERENCED_PARAMETER(ppsPMR);
    return PVRSRV_OK;
}