ArmPkg: Add support for GICv4

Updated Redistributor base calculation to allow for the fact that
GICv4 has 2 additional 64KB frames (for VLPI and a reserved frame).
The code now tests the VLPIS bit in the GIC Redistributor Type
Register (GICR_TYPER) and calculates the Redistributor granularity
accordingly.

The code changes are:
  GICR_TYPER register fields, etc, added to the header.
  Loop updated to pay attention to GICR_TYPER.Last.
  Derive frame "stride" size from GICR_TYPER.VLPIS.

Note: The assumption is that the redistributors are adjacent for
all CPUs. However this may not be the case for NUMA systems.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

2 files changed, 27 insertions, 18 deletions

diff --git a/ArmPkg/Drivers/ArmGic/ArmGicLib.c b/ArmPkg/Drivers/ArmGic/ArmGicLib.c
index 0087399..0be5b14 100644
--- a/ArmPkg/Drivers/ArmGic/ArmGicLib.c
+++ b/ArmPkg/Drivers/ArmGic/ArmGicLib.c
@@ -1,6 +1,6 @@
 /** @file

 *

-*  Copyright (c) 2011-2017, ARM Limited. All rights reserved.

+*  Copyright (c) 2011-2018, ARM Limited. All rights reserved.

 *

 *  This program and the accompanying materials

 *  are licensed and made available under the terms and conditions of the BSD License

@@ -19,6 +19,16 @@
 #include <Library/IoLib.h>

 #include <Library/PcdLib.h>

 

+// In GICv3, there are 2 x 64KB frames:

+// Redistributor control frame + SGI Control & Generation frame

+#define GIC_V3_REDISTRIBUTOR_GRANULARITY  (ARM_GICR_CTLR_FRAME_SIZE           \

+                                           + ARM_GICR_SGI_PPI_FRAME_SIZE)

+

+// In GICv4, there are 2 additional 64KB frames:

+// VLPI frame + Reserved page frame

+#define GIC_V4_REDISTRIBUTOR_GRANULARITY  (GIC_V3_REDISTRIBUTOR_GRANULARITY   \

+                                           + ARM_GICR_SGI_VLPI_FRAME_SIZE     \

+                                           + ARM_GICR_SGI_RESERVED_FRAME_SIZE)

 

 #define ISENABLER_ADDRESS(base,offset) ((base) + \

           ARM_GICR_CTLR_FRAME_SIZE +  ARM_GICR_ISENABLER + (4 * offset))

@@ -54,12 +64,11 @@ GicGetCpuRedistributorBase (
   IN ARM_GIC_ARCH_REVISION Revision

   )

 {

-  UINTN Index;

   UINTN MpId;

   UINTN CpuAffinity;

   UINTN Affinity;

-  UINTN GicRedistributorGranularity;

   UINTN GicCpuRedistributorBase;

+  UINT64 TypeRegister;

 

   MpId = ArmReadMpidr ();

   // Define CPU affinity as:

@@ -68,27 +77,30 @@ GicGetCpuRedistributorBase (
   CpuAffinity = (MpId & (ARM_CORE_AFF0 | ARM_CORE_AFF1 | ARM_CORE_AFF2)) |

                 ((MpId & ARM_CORE_AFF3) >> 8);

 

-  if (Revision == ARM_GIC_ARCH_REVISION_3) {

-    // 2 x 64KB frame:

-    //   Redistributor control frame + SGI Control & Generation frame

-    GicRedistributorGranularity = ARM_GICR_CTLR_FRAME_SIZE

-                                  + ARM_GICR_SGI_PPI_FRAME_SIZE;

-  } else {

+  if (Revision < ARM_GIC_ARCH_REVISION_3) {

     ASSERT_EFI_ERROR (EFI_UNSUPPORTED);

     return 0;

   }

 

   GicCpuRedistributorBase = GicRedistributorBase;

 

-  for (Index = 0; Index < PcdGet32 (PcdCoreCount); Index++) {

-    Affinity = MmioRead64 (GicCpuRedistributorBase + ARM_GICR_TYPER) >> 32;

+  do {

+    TypeRegister = MmioRead64 (GicCpuRedistributorBase + ARM_GICR_TYPER);

+    Affinity = ARM_GICR_TYPER_GET_AFFINITY (TypeRegister);

     if (Affinity == CpuAffinity) {

       return GicCpuRedistributorBase;

     }

 

-    // Move to the next GIC Redistributor frame

-    GicCpuRedistributorBase += GicRedistributorGranularity;

-  }

+    // Move to the next GIC Redistributor frame.

+    // The GIC specification does not forbid a mixture of redistributors

+    // with or without support for virtual LPIs, so we test Virtual LPIs

+    // Support (VLPIS) bit for each frame to decide the granularity.

+    // Note: The assumption here is that the redistributors are adjacent

+    // for all CPUs. However this may not be the case for NUMA systems.

+    GicCpuRedistributorBase += (((ARM_GICR_TYPER_VLPIS & TypeRegister) != 0)

+                                ? GIC_V4_REDISTRIBUTOR_GRANULARITY

+                                : GIC_V3_REDISTRIBUTOR_GRANULARITY);

+  } while ((TypeRegister & ARM_GICR_TYPER_LAST) == 0);

 

   // The Redistributor has not been found for the current CPU

   ASSERT_EFI_ERROR (EFI_NOT_FOUND);

diff --git a/ArmPkg/Drivers/ArmGic/ArmGicLib.inf b/ArmPkg/Drivers/ArmGic/ArmGicLib.inf
index 047adac..93375b7 100644
--- a/ArmPkg/Drivers/ArmGic/ArmGicLib.inf
+++ b/ArmPkg/Drivers/ArmGic/ArmGicLib.inf
@@ -1,5 +1,5 @@
 #/* @file

-#  Copyright (c) 2011-2015, ARM Limited. All rights reserved.

+#  Copyright (c) 2011-2018, ARM Limited. All rights reserved.

 #

 #  This program and the accompanying materials

 #  are licensed and made available under the terms and conditions of the BSD License

@@ -44,8 +44,5 @@
   ArmPlatformPkg/ArmPlatformPkg.dec

   MdePkg/MdePkg.dec

 

-[Pcd]

-  gArmPlatformTokenSpaceGuid.PcdCoreCount

-

 [FeaturePcd]

   gArmTokenSpaceGuid.PcdArmGicV3WithV2Legacy