diff mbox

[edk2,v2,1/3] ArmPkg: remove cache maintenance by VA operation range size threshold

Message ID 1427742834-24566-2-git-send-email-ard.biesheuvel@linaro.org
State New
Headers show

Commit Message

Ard Biesheuvel March 30, 2015, 7:13 p.m. UTC 
This removes the range size threshold for virtual address based cache
maintenance instructions that operate on VA ranges to be 'promoted' to
use set/way instructions.

Doing so is unsafe: set/way operations are fundamentally different
from VA operations, and really only suitable for cleaning or invalidating
a cache when turning it on or off.

To quote the ARM ARM (DDI0487A_d G3.4):
"""
Since the set/way instructions are performed only locally, there is no
guarantee of the atomicity of cache maintenance between different PEs,
even if those different PEs are each performing the same cache maintenance
instructions at the same time. Since any cacheable line can be allocated
into the cache at any time, it is possible for [a] cache line to migrate
from an entry in the cache of one PE to the cache of a different PE in a
manner that the cache line avoids being affected by set/way based cache
maintenance. Therefore, ARM strongly discourages the use of set/way
instructions to manage coherency in coherent systems.
"""

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 ArmPkg/ArmPkg.dec                                  |  3 +--
 .../ArmCacheMaintenanceLib.c                       | 29 ++++++++--------------
 .../ArmCacheMaintenanceLib.inf                     |  3 ---
 ArmPkg/Library/ArmLib/AArch64/AArch64Lib.inf       |  3 ---
 ArmPkg/Library/ArmLib/AArch64/AArch64LibPrePi.inf  |  3 ---
 ArmPkg/Library/ArmLib/AArch64/AArch64LibSec.inf    |  3 ---
 ArmPkg/Library/ArmLib/Arm11/Arm11Lib.inf           |  1 -
 ArmPkg/Library/ArmLib/Arm11/Arm11LibPrePi.inf      |  1 -
 ArmPkg/Library/ArmLib/Arm11/Arm11LibSec.inf        |  1 -
 ArmPkg/Library/ArmLib/Arm9/Arm9ArmLib.inf          |  3 ---
 ArmPkg/Library/ArmLib/Arm9/Arm9ArmLibPrePi.inf     |  3 ---
 ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.inf           |  3 ---
 ArmPkg/Library/ArmLib/ArmV7/ArmV7LibPrePi.inf      |  3 ---
 ArmPkg/Library/ArmLib/ArmV7/ArmV7LibSec.inf        |  3 ---
 ArmPkg/Library/ArmLib/Null/NullArmLib.inf          |  3 ---
 15 files changed, 12 insertions(+), 53 deletions(-)
diff mbox

Patch

diff --git a/ArmPkg/ArmPkg.dec b/ArmPkg/ArmPkg.dec
index 87dbd11b867f..b30de9152c13 100644
--- a/ArmPkg/ArmPkg.dec
+++ b/ArmPkg/ArmPkg.dec
@@ -82,8 +82,7 @@ 
   gArmTokenSpaceGuid.PcdArmUncachedMemoryMask|0x0000000080000000|UINT64|0x00000002
   # This PCD will free the unallocated buffers if their size reach this threshold.
   # We set the default value to 512MB.
-  gArmTokenSpaceGuid.PcdArmFreeUncachedMemorySizeThreshold|0x20000000|UINT64|0x00000043
-  gArmTokenSpaceGuid.PcdArmCacheOperationThreshold|1024|UINT32|0x00000003
+  gArmTokenSpaceGuid.PcdArmFreeUncachedMemorySizeThreshold|0x20000000|UINT64|0x00000003
   gArmTokenSpaceGuid.PcdCpuVectorBaseAddress|0xffff0000|UINT32|0x00000004
   gArmTokenSpaceGuid.PcdCpuResetAddress|0x00000000|UINT32|0x00000005
 
diff --git a/ArmPkg/Library/ArmCacheMaintenanceLib/ArmCacheMaintenanceLib.c b/ArmPkg/Library/ArmCacheMaintenanceLib/ArmCacheMaintenanceLib.c
index 8501e5c613c7..d8e53df6096e 100644
--- a/ArmPkg/Library/ArmCacheMaintenanceLib/ArmCacheMaintenanceLib.c
+++ b/ArmPkg/Library/ArmCacheMaintenanceLib/ArmCacheMaintenanceLib.c
@@ -20,27 +20,20 @@  VOID
 CacheRangeOperation (
   IN  VOID            *Start,
   IN  UINTN           Length,
-  IN  CACHE_OPERATION CacheOperation,
   IN  LINE_OPERATION  LineOperation
   )
 {
   UINTN ArmCacheLineLength         = ArmDataCacheLineLength();
   UINTN ArmCacheLineAlignmentMask  = ArmCacheLineLength - 1;
-  UINTN ArmCacheOperationThreshold = PcdGet32(PcdArmCacheOperationThreshold);
 
-  if ((CacheOperation != NULL) && (Length >= ArmCacheOperationThreshold)) {
-    ArmDrainWriteBuffer ();
-    CacheOperation ();
-  } else {
-    // Align address (rounding down)
-    UINTN AlignedAddress = (UINTN)Start - ((UINTN)Start & ArmCacheLineAlignmentMask);
-    UINTN EndAddress     = (UINTN)Start + Length;
+  // Align address (rounding down)
+  UINTN AlignedAddress = (UINTN)Start - ((UINTN)Start & ArmCacheLineAlignmentMask);
+  UINTN EndAddress     = (UINTN)Start + Length;
 
-    // Perform the line operation on an address in each cache line
-    while (AlignedAddress < EndAddress) {
-      LineOperation(AlignedAddress);
-      AlignedAddress += ArmCacheLineLength;
-    }
+  // Perform the line operation on an address in each cache line
+  while (AlignedAddress < EndAddress) {
+    LineOperation(AlignedAddress);
+    AlignedAddress += ArmCacheLineLength;
   }
 }
 
@@ -70,7 +63,7 @@  InvalidateInstructionCacheRange (
   IN      UINTN                     Length
   )
 {
-  CacheRangeOperation (Address, Length, ArmCleanDataCacheToPoU, ArmCleanDataCacheEntryByMVA);
+  CacheRangeOperation (Address, Length, ArmCleanDataCacheEntryByMVA);
   ArmInvalidateInstructionCache ();
   return Address;
 }
@@ -91,7 +84,7 @@  WriteBackInvalidateDataCacheRange (
   IN      UINTN                     Length
   )
 {
-  CacheRangeOperation(Address, Length, ArmCleanInvalidateDataCache, ArmCleanInvalidateDataCacheEntryByMVA);
+  CacheRangeOperation(Address, Length, ArmCleanInvalidateDataCacheEntryByMVA);
   return Address;
 }
 
@@ -111,7 +104,7 @@  WriteBackDataCacheRange (
   IN      UINTN                     Length
   )
 {
-  CacheRangeOperation(Address, Length, ArmCleanDataCache, ArmCleanDataCacheEntryByMVA);
+  CacheRangeOperation(Address, Length, ArmCleanDataCacheEntryByMVA);
   return Address;
 }
 
@@ -122,6 +115,6 @@  InvalidateDataCacheRange (
   IN      UINTN                     Length
   )
 {
-  CacheRangeOperation(Address, Length, NULL, ArmInvalidateDataCacheEntryByMVA);
+  CacheRangeOperation(Address, Length, ArmInvalidateDataCacheEntryByMVA);
   return Address;
 }
diff --git a/ArmPkg/Library/ArmCacheMaintenanceLib/ArmCacheMaintenanceLib.inf b/ArmPkg/Library/ArmCacheMaintenanceLib/ArmCacheMaintenanceLib.inf
index 5910db09d6ea..d5199729423c 100644
--- a/ArmPkg/Library/ArmCacheMaintenanceLib/ArmCacheMaintenanceLib.inf
+++ b/ArmPkg/Library/ArmCacheMaintenanceLib/ArmCacheMaintenanceLib.inf
@@ -31,6 +31,3 @@ 
 [LibraryClasses]
   ArmLib
   BaseLib
-
-[FixedPcd]
-  gArmTokenSpaceGuid.PcdArmCacheOperationThreshold
diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.inf b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.inf
index e5247848b549..dd585dea91fb 100644
--- a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.inf
+++ b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.inf
@@ -41,6 +41,3 @@ 
 
 [Protocols]
   gEfiCpuArchProtocolGuid
-
-[FixedPcd]
-  gArmTokenSpaceGuid.PcdArmCacheOperationThreshold
diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64LibPrePi.inf b/ArmPkg/Library/ArmLib/AArch64/AArch64LibPrePi.inf
index 3a99e1b713cc..23fbe8673198 100644
--- a/ArmPkg/Library/ArmLib/AArch64/AArch64LibPrePi.inf
+++ b/ArmPkg/Library/ArmLib/AArch64/AArch64LibPrePi.inf
@@ -43,6 +43,3 @@ 
 
 [Protocols]
   gEfiCpuArchProtocolGuid
-
-[FixedPcd]
-  gArmTokenSpaceGuid.PcdArmCacheOperationThreshold
diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64LibSec.inf b/ArmPkg/Library/ArmLib/AArch64/AArch64LibSec.inf
index 57ac694cd733..302c09af49dd 100644
--- a/ArmPkg/Library/ArmLib/AArch64/AArch64LibSec.inf
+++ b/ArmPkg/Library/ArmLib/AArch64/AArch64LibSec.inf
@@ -38,6 +38,3 @@ 
 
 [Protocols]
   gEfiCpuArchProtocolGuid
-
-[FixedPcd]
-  gArmTokenSpaceGuid.PcdArmCacheOperationThreshold
diff --git a/ArmPkg/Library/ArmLib/Arm11/Arm11Lib.inf b/ArmPkg/Library/ArmLib/Arm11/Arm11Lib.inf
index 32d9299629a7..6ac74d985c78 100644
--- a/ArmPkg/Library/ArmLib/Arm11/Arm11Lib.inf
+++ b/ArmPkg/Library/ArmLib/Arm11/Arm11Lib.inf
@@ -47,5 +47,4 @@ 
   gArmTokenSpaceGuid.PcdRelocateVectorTable
 
 [FixedPcd]
-  gArmTokenSpaceGuid.PcdArmCacheOperationThreshold
   gArmTokenSpaceGuid.PcdCpuVectorBaseAddress
diff --git a/ArmPkg/Library/ArmLib/Arm11/Arm11LibPrePi.inf b/ArmPkg/Library/ArmLib/Arm11/Arm11LibPrePi.inf
index 94dd03d82c5a..239493d3e60d 100644
--- a/ArmPkg/Library/ArmLib/Arm11/Arm11LibPrePi.inf
+++ b/ArmPkg/Library/ArmLib/Arm11/Arm11LibPrePi.inf
@@ -47,5 +47,4 @@ 
   gArmTokenSpaceGuid.PcdRelocateVectorTable
 
 [FixedPcd]
-  gArmTokenSpaceGuid.PcdArmCacheOperationThreshold
   gArmTokenSpaceGuid.PcdCpuVectorBaseAddress
diff --git a/ArmPkg/Library/ArmLib/Arm11/Arm11LibSec.inf b/ArmPkg/Library/ArmLib/Arm11/Arm11LibSec.inf
index 69763ed4ff3a..ef3c8f8f72a4 100644
--- a/ArmPkg/Library/ArmLib/Arm11/Arm11LibSec.inf
+++ b/ArmPkg/Library/ArmLib/Arm11/Arm11LibSec.inf
@@ -43,5 +43,4 @@ 
   gArmTokenSpaceGuid.PcdRelocateVectorTable
 
 [FixedPcd]
-  gArmTokenSpaceGuid.PcdArmCacheOperationThreshold
   gArmTokenSpaceGuid.PcdCpuVectorBaseAddress
diff --git a/ArmPkg/Library/ArmLib/Arm9/Arm9ArmLib.inf b/ArmPkg/Library/ArmLib/Arm9/Arm9ArmLib.inf
index 81661b2391d5..e8aa056fbfea 100644
--- a/ArmPkg/Library/ArmLib/Arm9/Arm9ArmLib.inf
+++ b/ArmPkg/Library/ArmLib/Arm9/Arm9ArmLib.inf
@@ -41,6 +41,3 @@ 
 
 [Protocols]
   gEfiCpuArchProtocolGuid
-
-[FixedPcd]
-  gArmTokenSpaceGuid.PcdArmCacheOperationThreshold
diff --git a/ArmPkg/Library/ArmLib/Arm9/Arm9ArmLibPrePi.inf b/ArmPkg/Library/ArmLib/Arm9/Arm9ArmLibPrePi.inf
index 0730487cfb9e..556e3dc5ab2a 100644
--- a/ArmPkg/Library/ArmLib/Arm9/Arm9ArmLibPrePi.inf
+++ b/ArmPkg/Library/ArmLib/Arm9/Arm9ArmLibPrePi.inf
@@ -41,6 +41,3 @@ 
 
 [Protocols]
   gEfiCpuArchProtocolGuid
-
-[FixedPcd]
-  gArmTokenSpaceGuid.PcdArmCacheOperationThreshold
diff --git a/ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.inf b/ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.inf
index 55c0ec661a81..01bdfb699656 100644
--- a/ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.inf
+++ b/ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.inf
@@ -48,6 +48,3 @@ 
 
 [Protocols]
   gEfiCpuArchProtocolGuid
-
-[FixedPcd]
-  gArmTokenSpaceGuid.PcdArmCacheOperationThreshold
diff --git a/ArmPkg/Library/ArmLib/ArmV7/ArmV7LibPrePi.inf b/ArmPkg/Library/ArmLib/ArmV7/ArmV7LibPrePi.inf
index bc403d5613ca..ac081068db28 100644
--- a/ArmPkg/Library/ArmLib/ArmV7/ArmV7LibPrePi.inf
+++ b/ArmPkg/Library/ArmLib/ArmV7/ArmV7LibPrePi.inf
@@ -48,6 +48,3 @@ 
 
 [Protocols]
   gEfiCpuArchProtocolGuid
-
-[FixedPcd]
-  gArmTokenSpaceGuid.PcdArmCacheOperationThreshold
diff --git a/ArmPkg/Library/ArmLib/ArmV7/ArmV7LibSec.inf b/ArmPkg/Library/ArmLib/ArmV7/ArmV7LibSec.inf
index 4081d1a3e563..a958764f5648 100644
--- a/ArmPkg/Library/ArmLib/ArmV7/ArmV7LibSec.inf
+++ b/ArmPkg/Library/ArmLib/ArmV7/ArmV7LibSec.inf
@@ -42,6 +42,3 @@ 
 
 [Protocols]
   gEfiCpuArchProtocolGuid
-
-[FixedPcd]
-  gArmTokenSpaceGuid.PcdArmCacheOperationThreshold
diff --git a/ArmPkg/Library/ArmLib/Null/NullArmLib.inf b/ArmPkg/Library/ArmLib/Null/NullArmLib.inf
index 21c374f0b293..36860a7bf949 100644
--- a/ArmPkg/Library/ArmLib/Null/NullArmLib.inf
+++ b/ArmPkg/Library/ArmLib/Null/NullArmLib.inf
@@ -40,6 +40,3 @@ 
 
 [Protocols]
   gEfiCpuArchProtocolGuid
-
-[FixedPcd]
-  gArmTokenSpaceGuid.PcdArmCacheOperationThreshold