From: Alexei <alexei.fedo...@arm.com> This commit fixes a bug in the GIC v2 and v3 drivers where the GICC_EOIR (End Of Interrupt Register) is written twice for a single interrupt. GicV(2|3)IrqInterruptHandler() calls the Interrupt Handler and then GicV(2|3)EndOfInterrupt() on exit:
InterruptHandler = gRegisteredInterruptHandlers[GicInterrupt]; if (InterruptHandler != NULL) { // Call the registered interrupt handler. InterruptHandler (GicInterrupt, SystemContext); } else { DEBUG ((EFI_D_ERROR, "Spurious GIC interrupt: 0x%x\n", GicInterrupt)); } GicV2EndOfInterrupt (&gHardwareInterruptV2Protocol, GicInterrupt); , although gInterrupt->EndOfInterrupt() has already been called by InterruptHandler(). The fix moves the EndOfInterrupt() call inside the else case for unregistered/spurious interrupts. This removes a potential race condition that might have lost interrupts. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Alexei Fedorov <alexei.fedo...@arm.com> Signed-off-by: Evan Lloyd <evan.ll...@arm.com> --- Code is available at: https://github.com/EvanLloyd/tianocore/tree/EOIR_v1 ArmPkg/Drivers/ArmGic/GicV2/ArmGicV2Dxe.c | 5 ++--- ArmPkg/Drivers/ArmGic/GicV3/ArmGicV3Dxe.c | 5 ++--- 2 files changed, 4 insertions(+), 6 deletions(-) diff --git a/ArmPkg/Drivers/ArmGic/GicV2/ArmGicV2Dxe.c b/ArmPkg/Drivers/ArmGic/GicV2/ArmGicV2Dxe.c index 036eb5cd6bf6845dd2b03b62c933c1dedaef7251..34d4be3867647e0fdad7356c949af8cd3ede7164 100644 --- a/ArmPkg/Drivers/ArmGic/GicV2/ArmGicV2Dxe.c +++ b/ArmPkg/Drivers/ArmGic/GicV2/ArmGicV2Dxe.c @@ -2,7 +2,7 @@ Copyright (c) 2009, Hewlett-Packard Company. All rights reserved.<BR> Portions copyright (c) 2010, Apple Inc. All rights reserved.<BR> -Portions copyright (c) 2011-2015, ARM Ltd. All rights reserved.<BR> +Portions copyright (c) 2011-2016, ARM Ltd. All rights reserved.<BR> This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License @@ -178,9 +178,8 @@ GicV2IrqInterruptHandler ( InterruptHandler (GicInterrupt, SystemContext); } else { DEBUG ((EFI_D_ERROR, "Spurious GIC interrupt: 0x%x\n", GicInterrupt)); + GicV2EndOfInterrupt (&gHardwareInterruptV2Protocol, GicInterrupt); } - - GicV2EndOfInterrupt (&gHardwareInterruptV2Protocol, GicInterrupt); } // diff --git a/ArmPkg/Drivers/ArmGic/GicV3/ArmGicV3Dxe.c b/ArmPkg/Drivers/ArmGic/GicV3/ArmGicV3Dxe.c index 106c669fcb8777dfaad609c0ce9f5b572727a3ff..983936f3738a74bb5d5e08e012973df240958a8b 100644 --- a/ArmPkg/Drivers/ArmGic/GicV3/ArmGicV3Dxe.c +++ b/ArmPkg/Drivers/ArmGic/GicV3/ArmGicV3Dxe.c @@ -1,6 +1,6 @@ /** @file * -* Copyright (c) 2011-2015, ARM Limited. All rights reserved. +* Copyright (c) 2011-2016, 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 @@ -169,9 +169,8 @@ GicV3IrqInterruptHandler ( InterruptHandler (GicInterrupt, SystemContext); } else { DEBUG ((EFI_D_ERROR, "Spurious GIC interrupt: 0x%x\n", GicInterrupt)); + GicV3EndOfInterrupt (&gHardwareInterruptV3Protocol, GicInterrupt); } - - GicV3EndOfInterrupt (&gHardwareInterruptV3Protocol, GicInterrupt); } // -- Guid("CE165669-3EF3-493F-B85D-6190EE5B9759") _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel