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[NTOSKRNL] Respect PFN cache attribute when required

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This fixes noisy DPRINT1 being printed while reading
or writing files with NFS.
This commit is contained in:
Pierre Schweitzer 2018-10-01 13:47:06 +02:00
parent cc27de18f4
commit fd8893e58f
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GPG key ID: 7545556C3D585B0B
1 changed files with 37 additions and 7 deletions
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44
ntoskrnl/mm/ARM3/mdlsup.c
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@ -21,6 +21,8 @@ BOOLEAN MmTrackPtes;
BOOLEAN MmTrackLockedPages;
SIZE_T MmSystemLockPagesCount;
ULONG MiCacheOverride[MiNotMapped + 1];
/* INTERNAL FUNCTIONS *********************************************************/
static
PVOID
@ -36,6 +38,7 @@ MiMapLockedPagesInUserSpace(
PETHREAD Thread = PsGetCurrentThread();
TABLE_SEARCH_RESULT Result;
MI_PFN_CACHE_ATTRIBUTE CacheAttribute;
MI_PFN_CACHE_ATTRIBUTE EffectiveCacheAttribute;
BOOLEAN IsIoMapping;
KIRQL OldIrql;
ULONG_PTR StartingVa;
@ -180,23 +183,50 @@ MiMapLockedPagesInUserSpace(
MM_READWRITE,
*MdlPages);
/* FIXME: We need to respect the PFN's caching information in some cases */
EffectiveCacheAttribute = CacheAttribute;
/* We need to respect the PFN's caching information in some cases */
Pfn2 = MiGetPfnEntry(*MdlPages);
if (Pfn2 != NULL)
{
ASSERT(Pfn2->u3.e2.ReferenceCount != 0);
if (Pfn2->u3.e1.CacheAttribute != CacheAttribute)
switch (Pfn2->u3.e1.CacheAttribute)
{
DPRINT1("FIXME: Using caller's cache attribute instead of PFN override\n");
}
case MiNonCached:
if (CacheAttribute != MiNonCached)
{
MiCacheOverride[1]++;
EffectiveCacheAttribute = MiNonCached;
}
break;
/* We don't support AWE magic */
ASSERT(Pfn2->u3.e1.CacheAttribute != MiNotMapped);
case MiCached:
if (CacheAttribute != MiCached)
{
MiCacheOverride[0]++;
EffectiveCacheAttribute = MiCached;
}
break;
case MiWriteCombined:
if (CacheAttribute != MiWriteCombined)
{
MiCacheOverride[2]++;
EffectiveCacheAttribute = MiWriteCombined;
}
break;
default:
/* We don't support AWE magic (MiNotMapped) */
DPRINT1("FIXME: MiNotMapped is not supported\n");
ASSERT(FALSE);
break;
}
}
/* Configure caching */
switch (CacheAttribute)
switch (EffectiveCacheAttribute)
{
case MiNonCached:
MI_PAGE_DISABLE_CACHE(&TempPte);