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

/*************************************************************************/ /*!
@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
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The above copyright notice and this permission notice shall be included in
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not delete the provisions above, a recipient may use your version of this file
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PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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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 PVRSRV_MEMALLOCFLAGS_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_PHYS_HEAP_HINT(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_LOG_GOTO_IF_ERROR(eError, "DevmemAllocateExportable", e0);

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

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

    eError = OSLockCreate(&psData->hInfoPageLock);
    PVR_LOG_GOTO_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_LOG_RETURN_IF_FALSE(psData->psInfoPageMemDesc != NULL, "invalid MEMDESC"
                      " handle", PVRSRV_ERROR_INVALID_PARAMS);
    PVR_LOG_RETURN_IF_FALSE(psData->psInfoPagePMR != NULL, "invalid PMR handle",
                      PVRSRV_ERROR_INVALID_PARAMS);

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

    /* Mark the PMR such that no layout changes can happen
     * This is a fixed layout created during early stages of
     * driver loading and shouldn't change later */
    PMR_SetLayoutFixed(psData->psInfoPagePMR, IMG_TRUE);

    return PVRSRV_OK;
}

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