GmmGen10CachePolicy.cpp

/*==============================================================================
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#include "Internal/Common/GmmLibInc.h"
#include "External/Common/GmmCachePolicy.h"
#include "External/Common/CachePolicy/GmmCachePolicyGen10.h"
//=============================================================================
//
// Function: __GmmGen10InitCachePolicy
//
// Desc: This function initializes the cache policy
//
// Parameters: pCachePolicy  -> Ptr to array to be populated with the
//             mapping of usages -> cache settings.
//
// Return: GMM_STATUS
//
//-----------------------------------------------------------------------------
GMM_STATUS GmmLib::GmmGen10CachePolicy::InitCachePolicy()
{

    __GMM_ASSERTPTR(pCachePolicy, GMM_ERROR);

#define DEFINE_CACHE_ELEMENT(usage, llc, ellc, l3, wt, age, lecc_scc, l3_scc, sso, cos, hdcl1) DEFINE_CP_ELEMENT(usage, llc, ellc, l3, wt, age, 0, lecc_scc, l3_scc, 0, sso, cos, hdcl1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
#include "GmmGen10CachePolicy.h"

#define TC_LLC (1)
#define TC_ELLC (0) //Is this supported anymore in TargetCache?
#define TC_LLC_ELLC (2)

#define LeCC_UNCACHEABLE (0x1)
#define LeCC_WT_CACHEABLE (0x2) //Only used as MemPushWRite disqualifier if set along with eLLC-only
#define LeCC_WB_CACHEABLE (0x3)

#define L3_UNCACHEABLE (0x1)
#define L3_WB_CACHEABLE (0x3)

#define DISABLE_SKIP_CACHING_CONTROL (0x0)
#define ENABLE_SKIP_CACHING_CONTROL (0x1)

#define DISABLE_SELF_SNOOP_OVERRIDE (0x0)
#define ENABLE_SELF_SNOOP_OVERRIDE (0x1)
#define ENABLE_SELF_SNOOP_ALWAYS (0x3)
#define CLASS_SERVICE_ZERO 0
    {
        // Define index of cache element
        uint32_t Usage = 0;

        uint32_t                      CurrentMaxIndex        = 0;
        uint32_t                      CurrentMaxHDCL1Index   = GMM_GEN10_HDCL1_MOCS_INDEX_START - 1; // define constant
        GMM_CACHE_POLICY_TBL_ELEMENT *pCachePolicyTlbElement = pGmmLibContext->GetCachePolicyTlbElement();

        // index 0 is uncached.
        {
            GMM_CACHE_POLICY_TBL_ELEMENT *Entry0 = &(pCachePolicyTlbElement[0]);
            Entry0->LeCC.Cacheability            = LeCC_UNCACHEABLE;
            Entry0->LeCC.TargetCache             = TC_LLC_ELLC;
            Entry0->LeCC.LRUM                    = 0;
            Entry0->LeCC.ESC                     = DISABLE_SKIP_CACHING_CONTROL;
            Entry0->LeCC.SCC                     = 0;
            Entry0->LeCC.CoS                     = CLASS_SERVICE_ZERO;
            Entry0->LeCC.SelfSnoop               = DISABLE_SELF_SNOOP_OVERRIDE;
            Entry0->L3.Cacheability              = L3_UNCACHEABLE;
            Entry0->L3.ESC                       = DISABLE_SKIP_CACHING_CONTROL;
            Entry0->L3.SCC                       = 0;
            Entry0->HDCL1                        = 0;
        }

        // Process the cache policy and fill in the look up table
        for(; Usage < GMM_RESOURCE_USAGE_MAX; Usage++)
        {
            bool                         CachePolicyError = false;
            int32_t                      CPTblIdx         = -1;
            uint32_t                     j                = 0;
            uint64_t                     PTEValue         = 0;
            GMM_CACHE_POLICY_TBL_ELEMENT UsageEle         = {0};
            UsageEle.LeCC.Reserved                        = 0; // Reserved bits zeroe'd, this is so we
                                                               // we can compare the unioned LeCC.DwordValue.
            UsageEle.LeCC.SelfSnoop = DISABLE_SELF_SNOOP_OVERRIDE;
            UsageEle.LeCC.CoS       = CLASS_SERVICE_ZERO;
            UsageEle.LeCC.SCC       = 0;
            UsageEle.LeCC.ESC       = 0;
            if(pCachePolicy[Usage].SSO & ENABLE_SELF_SNOOP_OVERRIDE)
            {
                UsageEle.LeCC.SelfSnoop = pCachePolicy[Usage].SSO & ENABLE_SELF_SNOOP_ALWAYS;
            }
            if(pCachePolicy[Usage].CoS)
            {
                UsageEle.LeCC.CoS = pCachePolicy[Usage].CoS;
            }
            if(pCachePolicy[Usage].HDCL1)
            {
                UsageEle.HDCL1 = 1;
            }
            if(pCachePolicy[Usage].LeCC_SCC)
            {
                UsageEle.LeCC.SCC = pCachePolicy[Usage].LeCC_SCC;
                UsageEle.LeCC.ESC = ENABLE_SKIP_CACHING_CONTROL;
            }
            UsageEle.LeCC.LRUM = pCachePolicy[Usage].AGE;

            // default to LLC/ELLC target cache.
            UsageEle.LeCC.TargetCache  = TC_LLC_ELLC;
            UsageEle.LeCC.Cacheability = LeCC_WB_CACHEABLE;
            if(pCachePolicy[Usage].LLC && pCachePolicy[Usage].ELLC)
            {
                UsageEle.LeCC.TargetCache = TC_LLC_ELLC;
            }
            else if(pCachePolicy[Usage].LLC)
            {
                UsageEle.LeCC.TargetCache = TC_LLC;
            }
            else if(pCachePolicy[Usage].ELLC)
            {
                UsageEle.LeCC.TargetCache = TC_ELLC;
                if(pCachePolicy[Usage].WT)
                {
                    UsageEle.LeCC.Cacheability = LeCC_WT_CACHEABLE;
                }
            }
            else
            {
                UsageEle.LeCC.Cacheability = LeCC_UNCACHEABLE;
            }
            UsageEle.L3.Reserved = 0; // Reserved bits zeroe'd, this is so we
                                      // we can compare the unioned L3.UshortValue.
            UsageEle.L3.ESC          = DISABLE_SKIP_CACHING_CONTROL;
            UsageEle.L3.SCC          = 0;
            UsageEle.L3.Cacheability = pCachePolicy[Usage].L3 ? L3_WB_CACHEABLE : L3_UNCACHEABLE;

            if(pCachePolicy[Usage].L3_SCC)
            {
                UsageEle.L3.ESC = ENABLE_SKIP_CACHING_CONTROL;
                UsageEle.L3.SCC = (uint16_t)pCachePolicy[Usage].L3_SCC;
            }
            //For HDC L1 caching, MOCS Table index 48-61 should be used
            if(UsageEle.HDCL1)
            {
                for(j = GMM_GEN10_HDCL1_MOCS_INDEX_START; j <= CurrentMaxHDCL1Index; j++)
                {
                    GMM_CACHE_POLICY_TBL_ELEMENT *TblEle = &pCachePolicyTlbElement[j];
                    if(TblEle->LeCC.DwordValue == UsageEle.LeCC.DwordValue &&
                       TblEle->L3.UshortValue == UsageEle.L3.UshortValue &&
                       TblEle->HDCL1 == UsageEle.HDCL1)
                    {
                        CPTblIdx = j;
                        break;
                    }
                }
            }
            else
            {
                for(j = 0; j <= CurrentMaxIndex; j++)
                {
                    GMM_CACHE_POLICY_TBL_ELEMENT *TblEle = &pCachePolicyTlbElement[j];
                    if(TblEle->LeCC.DwordValue == UsageEle.LeCC.DwordValue &&
                       TblEle->L3.UshortValue == UsageEle.L3.UshortValue &&
                       TblEle->HDCL1 == UsageEle.HDCL1)
                    {
                        CPTblIdx = j;
                        break;
                    }
                }
            }

            // Didn't find the caching settings in one of the already programmed lookup table entries.
            // Need to add a new lookup table entry.
            if(CPTblIdx == -1)
            {
                if(UsageEle.HDCL1 && CurrentMaxHDCL1Index < GMM_GEN9_MAX_NUMBER_MOCS_INDEXES - 1)
                {
                    GMM_CACHE_POLICY_TBL_ELEMENT *TblEle = &(pCachePolicyTlbElement[++CurrentMaxHDCL1Index]);
                    CPTblIdx                             = CurrentMaxHDCL1Index;

                    TblEle->LeCC.DwordValue = UsageEle.LeCC.DwordValue;
                    TblEle->L3.UshortValue  = UsageEle.L3.UshortValue;
                    TblEle->HDCL1           = UsageEle.HDCL1;
                }
                else if(CurrentMaxIndex < GMM_GEN10_HDCL1_MOCS_INDEX_START)
                {
                    GMM_CACHE_POLICY_TBL_ELEMENT *TblEle = &(pCachePolicyTlbElement[++CurrentMaxIndex]);
                    CPTblIdx                             = CurrentMaxIndex;

                    TblEle->LeCC.DwordValue = UsageEle.LeCC.DwordValue;
                    TblEle->L3.UshortValue  = UsageEle.L3.UshortValue;
                    TblEle->HDCL1           = UsageEle.HDCL1;
                }
                else
                {
                    // Too many unique caching combinations to program the
                    // MOCS lookup table.
                    CachePolicyError = true;
                    GMM_ASSERTDPF(
                    "Cache Policy Init Error: Invalid Cache Programming, too many unique caching combinations"
                    "(we only support GMM_GEN_MAX_NUMBER_MOCS_INDEXES = %d)",
                    GMM_GEN9_MAX_NUMBER_MOCS_INDEXES - 1);
                    // Set cache policy index to uncached.
                    CPTblIdx = 0;
                }
            }

            // PTE entries do not control caching on SKL+ (for legacy context)
            if(!GetUsagePTEValue(pCachePolicy[Usage], Usage, &PTEValue))
            {
                CachePolicyError = true;
            }

            pCachePolicy[Usage].PTE.DwordValue     = PTEValue & 0xFFFFFFFF;
            pCachePolicy[Usage].PTE.HighDwordValue = 0;

            pCachePolicy[Usage].MemoryObjectOverride.Gen10.Index = CPTblIdx;

            pCachePolicy[Usage].Override = ALWAYS_OVERRIDE;

            if(CachePolicyError)
            {
                GMM_ASSERTDPF("Cache Policy Init Error: Invalid Cache Programming - Element %d", Usage);
            }
        }
        CurrentMaxMocsIndex      = CurrentMaxIndex;
        CurrentMaxL1HdcMocsIndex = CurrentMaxHDCL1Index;
    }

    return GMM_SUCCESS;
}

/////////////////////////////////////////////////////////////////////////////////////
/// Initializes WA's needed for setting up the Private PATs
/// WaNoMocsEllcOnly, WaGttPat0, WaGttPat0GttWbOverOsIommuEllcOnly, WaGttPat0WB
///
/// @return        GMM_STATUS
///
/////////////////////////////////////////////////////////////////////////////////////
GMM_STATUS GmmLib::GmmGen10CachePolicy::SetPATInitWA()
{
    GMM_STATUS Status = GMM_SUCCESS;

#if(defined(__GMM_KMD__))
    if(pGmmLibContext->GetGtSysInfoPtr()->EdramSizeInKb)
    {
        const_cast<WA_TABLE &>(pGmmLibContext->GetWaTable()).WaNoMocsEllcOnly = 1;
    }
#else
    Status = GMM_ERROR;
#endif

    return Status;
}

/////////////////////////////////////////////////////////////////////////////////////
/// Returns the PAT idx that best matches the cache policy for this usage.
///
/// @param: CachePolicy: cache policy for a usage
///
/// @return        PAT Idx to use in the PTE
/////////////////////////////////////////////////////////////////////////////////////
uint32_t GmmLib::GmmGen10CachePolicy::BestMatchingPATIdx(const GMM_CACHE_POLICY_ELEMENT &CachePolicy)
{
    uint32_t             i;
    uint32_t             PATIdx           = 0;
    GMM_GFX_MEMORY_TYPE  WantedMemoryType = GMM_GFX_UC_WITH_FENCE, MemoryType;
    GMM_GFX_TARGET_CACHE WantedTC         = GMM_GFX_TC_ELLC_LLC;

    WantedMemoryType = GetWantedMemoryType(CachePolicy);

    if(CachePolicy.LLC && CachePolicy.ELLC)
    {
        WantedTC = GMM_GFX_TC_ELLC_LLC;
    }
    else if(CachePolicy.LLC)
    {
        WantedTC = GMM_GFX_TC_LLC_ONLY;
    }
    else if(CachePolicy.ELLC)
    {
        WantedTC = GMM_GFX_TC_ELLC_ONLY; // Note: this overrides the MOCS target cache selection.
    }

    for(i = 1; i < NumPATRegisters; i++)
    {
        GMM_PRIVATE_PAT PAT1 = GetPrivatePATEntry(PATIdx);
        GMM_PRIVATE_PAT PAT2 = GetPrivatePATEntry(i);

        if(SelectNewPATIdx(WantedMemoryType, WantedTC,
                           (GMM_GFX_MEMORY_TYPE)PAT1.Gen10.MemoryType, (GMM_GFX_TARGET_CACHE)PAT1.Gen10.TargetCache,
                           (GMM_GFX_MEMORY_TYPE)PAT2.Gen10.MemoryType, (GMM_GFX_TARGET_CACHE)PAT2.Gen10.TargetCache))
        {
            PATIdx = i;
        }
    }

    MemoryType = (GMM_GFX_MEMORY_TYPE)GetPrivatePATEntry(PATIdx).Gen10.MemoryType;

    if(MemoryType != WantedMemoryType)
    {
        // Failed to find a matching PAT entry
        return GMM_PAT_ERROR;
    }
    return PATIdx;
}

/////////////////////////////////////////////////////////////////////////////////////
///  Initializes the Gfx PAT tables for AdvCtx and Gfx MMIO/Private PAT
///    PAT0 = WB_COHERENT or UC depending on WaGttPat0WB
///    PAT1 = UC or WB_COHERENT depending on WaGttPat0WB
///    PAT2 = WB_MOCSLESS, with TC = eLLC+LLC
///    PAT3 = WB
///    PAT4 = WT
///    PAT5 = WC
///    PAT6 = WC
///    PAT7 = WC
///  HLD says to set to PAT0/1 to WC, but since we don't have a WC in GPU,
///  WC option is same as UC. Hence setting PAT0 or PAT1 to UC.
///  Unused PAT's (5,6,7) are set to WC.
///
/// @return        GMM_STATUS
/////////////////////////////////////////////////////////////////////////////////////
GMM_STATUS GmmLib::GmmGen10CachePolicy::SetupPAT()
{
    GMM_STATUS Status = GMM_SUCCESS;
#if(defined(__GMM_KMD__))
    uint32_t i = 0;

    GMM_GFX_MEMORY_TYPE GfxMemType = GMM_GFX_UC_WITH_FENCE;
    // No optional selection on Age or Target Cache because for an SVM-OS Age and
    // Target Cache would not work [for an SVM-OS the Page Table is shared with IA
    // and we don't have control of the PAT Idx]. If there is a strong ask from D3D
    // or the performance analysis team, Age could be added.
    // Add Class of Service when required.
    GMM_GFX_TARGET_CACHE GfxTargetCache             = GMM_GFX_TC_ELLC_LLC;
    uint8_t              Age                        = 1;
    uint8_t              ServiceClass               = 0;
    int32_t *            pPrivatePATTableMemoryType = NULL;
    pPrivatePATTableMemoryType                      = pGmmLibContext->GetPrivatePATTableMemoryType();

    __GMM_ASSERT(pGmmLibContext->GetSkuTable().FtrIA32eGfxPTEs);
    for(i = 0; i < GMM_NUM_GFX_PAT_TYPES; i++)
    {
        pPrivatePATTableMemoryType[i] = -1;
    }

    // Set values for GmmGlobalInfo PrivatePATTable
    for(i = 0; i < NumPATRegisters; i++)
    {
        GMM_PRIVATE_PAT PAT = {0};

	if(pGmmLibContext->GetWaTable().WaNoMocsEllcOnly)
        {
            GfxTargetCache = GMM_GFX_TC_ELLC_ONLY;
        }
        else
        {
            GfxTargetCache = GMM_GFX_TC_ELLC_LLC;
        }

        switch(i)
        {
            case PAT0:
                if(pGmmLibContext->GetWaTable().WaGttPat0)
		{
                    if(pGmmLibContext->GetWaTable().WaGttPat0WB)			 
	            {
                        GfxMemType = GMM_GFX_WB;
                        if(GFX_IS_ATOM_PLATFORM(pGmmLibContext))
                        {
                            PAT.PreGen10.Snoop = 1;
                        }
                        pPrivatePATTableMemoryType[GMM_GFX_PAT_WB_COHERENT] = PAT0;
                    }
                    else
                    {
                        GfxMemType                                 = GMM_GFX_UC_WITH_FENCE;
                        pPrivatePATTableMemoryType[GMM_GFX_PAT_UC] = PAT0;
                    }
                }
                else // if GTT is not tied to PAT0 then WaGttPat0WB is NA
                {
                    GfxMemType = GMM_GFX_WB;
                    if(GFX_IS_ATOM_PLATFORM(pGmmLibContext))
                    {
                        PAT.PreGen10.Snoop = 1;
                    }
                    pPrivatePATTableMemoryType[GMM_GFX_PAT_WB_COHERENT] = PAT0;
                }
                break;

            case PAT1:
                if(pGmmLibContext->GetWaTable().WaGttPat0 && !pGmmLibContext->GetWaTable().WaGttPat0WB)		
                {
                    GfxMemType = GMM_GFX_WB;
                    if(GFX_IS_ATOM_PLATFORM(pGmmLibContext))
                    {
                        PAT.PreGen10.Snoop = 1;
                    }
                    pPrivatePATTableMemoryType[GMM_GFX_PAT_WB_COHERENT] = PAT1;
                }
                else
                {
                    GfxMemType                                 = GMM_GFX_UC_WITH_FENCE;
                    pPrivatePATTableMemoryType[GMM_GFX_PAT_UC] = PAT1;
                }
                break;

            case PAT2:
                // This PAT idx shall be used for MOCS'Less resources like Page Tables
                // Page Tables have TC hardcoded to eLLC+LLC in Adv Ctxt. Hence making this to have same in Leg Ctxt.
                // For BDW-H, due to Perf issue, TC has to be eLLC only for Page Tables when eDRAM is present.
                GfxMemType                                          = GMM_GFX_WB;
                GfxTargetCache                                      = GMM_GFX_TC_ELLC_LLC;
                pPrivatePATTableMemoryType[GMM_GFX_PAT_WB_MOCSLESS] = PAT2;
                break;

            case PAT3:
                GfxMemType                                 = GMM_GFX_WB;
                pPrivatePATTableMemoryType[GMM_GFX_PAT_WB] = PAT3;
                break;

            case PAT4:
                GfxMemType                                 = GMM_GFX_WT;
                pPrivatePATTableMemoryType[GMM_GFX_PAT_WT] = PAT4;
                break;

            case PAT5:
            case PAT6:
            case PAT7:
                GfxMemType                                 = GMM_GFX_WC;
                pPrivatePATTableMemoryType[GMM_GFX_PAT_WC] = PAT5;
                break;

            default:
                __GMM_ASSERT(0);
                Status = GMM_ERROR;
        }

        PAT.Gen10.MemoryType  = GfxMemType;
        PAT.Gen10.TargetCache = GfxTargetCache;
        PAT.Gen10.Age         = Age;
        PAT.Gen10.CoS         = ServiceClass;

        SetPrivatePATEntry(i, PAT);
    }

#else
    Status = GMM_ERROR;
#endif
    return Status;
}