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IntelSiliconPkg IntelVTdDxe: Fix incorrect code to clear VTd error 

According to VTd spec, Software writes the value read from this
field (F) to Clear it. But current code is using 0 to clear the
field, that is incorrect.

And R_FSTS_REG register value clearing should be not in the for loop.

Without this patch, we will see same VTd error message appears again
and again after it occurs first time.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
This commit is contained in:
Star Zeng 2018-06-05 16:04:38 +08:00
parent 91c31ff04a
commit 8653ea2088
1 changed files with 4 additions and 2 deletions
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6
IntelSiliconPkg/Feature/VTd/IntelVTdDxe/VtdReg.c
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@ -554,11 +554,13 @@ DumpVtdIfError (
for (Index = 0; Index < (UINTN)CapReg.Bits.NFR + 1; Index++) {
FrcdReg.Uint64[1] = MmioRead64 (mVtdUnitInformation[Num].VtdUnitBaseAddress + ((CapReg.Bits.FRO * 16) + (Index * 16) + R_FRCD_REG + sizeof(UINT64)));
if (FrcdReg.Bits.F != 0) {
FrcdReg.Bits.F = 0;
//
// Software writes the value read from this field (F) to Clear it.
//
MmioWrite64 (mVtdUnitInformation[Num].VtdUnitBaseAddress + ((CapReg.Bits.FRO * 16) + (Index * 16) + R_FRCD_REG + sizeof(UINT64)), FrcdReg.Uint64[1]);
}
MmioWrite32 (mVtdUnitInformation[Num].VtdUnitBaseAddress + R_FSTS_REG, MmioRead32 (mVtdUnitInformation[Num].VtdUnitBaseAddress + R_FSTS_REG));
}
MmioWrite32 (mVtdUnitInformation[Num].VtdUnitBaseAddress + R_FSTS_REG, MmioRead32 (mVtdUnitInformation[Num].VtdUnitBaseAddress + R_FSTS_REG));
}
}
}