[edk2-devel] [PATCH v1 1/1] ArmPkg/ArmGicDxe: fix writes to GICD_IPRIORITYR<n> when ARE enable
Quan Nguyen via groups.io
quan=os.amperecomputing.com at groups.io
Wed Oct 28 01:21:12 UTC 2020
According to ARM doc IHI 0069F, section 11.9.18, "Accessing the
GICD_IPRIORITYR<n>:", "These registers are always used when affinity
routing is not enabled. When affinity routing is enabled for the
Security state of an interrupt:
* GICR_IPRIORITYR<n> is used instead of GICD_IPRIORITYR<n> where n = 0
to 7 (that is, for SGIs and PPIs)."
The current ArmGicV3 code tries to initialize all the IPRIORITYR
registers to a default state via the Distributor (GICD), so skip
writes to the first eight IPRIORITYR registers when Affinity Routing
is Enabled.
Cc: Leif Lindholm <leif at nuviainc.com>
Cc: Ard Biesheuvel <ard.biesheuvel at arm.com>
Signed-off-by: Victor Gallardo <Victor at os.amperecomputing.com>
Signed-off-by: Quan Nguyen <quan at os.amperecomputing.com>
---
ArmPkg/Drivers/ArmGic/GicV3/ArmGicV3Dxe.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/ArmPkg/Drivers/ArmGic/GicV3/ArmGicV3Dxe.c b/ArmPkg/Drivers/ArmGic/GicV3/ArmGicV3Dxe.c
index d7da1f198d9e..bc543502481b 100644
--- a/ArmPkg/Drivers/ArmGic/GicV3/ArmGicV3Dxe.c
+++ b/ArmPkg/Drivers/ArmGic/GicV3/ArmGicV3Dxe.c
@@ -378,6 +378,7 @@ GicV3DxeInitialize (
UINTN RegShift;
UINT64 CpuTarget;
UINT64 MpId;
+ BOOLEAN AffinityRoutingEnabled = FALSE;
// Make sure the Interrupt Controller Protocol is not already installed in
// the system.
@@ -391,11 +392,21 @@ GicV3DxeInitialize (
// Routing enabled. So ensure that the ARE bit is set.
if (!FeaturePcdGet (PcdArmGicV3WithV2Legacy)) {
MmioOr32 (mGicDistributorBase + ARM_GIC_ICDDCR, ARM_GIC_ICDDCR_ARE);
+ // If Affinity Routing is Enabled, the first 32 interrupts (SGI and PPI)
+ // can be programmed only through Redistributor interface (GICR).
+ // Initializing the GICD_IPRIORITYR registers for these interrupts can be
+ // skipped as the Redistributor will be powered up and initialized
+ // at the appropriate time (e.g. in EL3 by trusted firmware).
+ AffinityRoutingEnabled = TRUE;
}
for (Index = 0; Index < mGicNumInterrupts; Index++) {
GicV3DisableInterruptSource (&gHardwareInterruptV3Protocol, Index);
+ if (AffinityRoutingEnabled && Index < 32) {
+ continue;
+ }
+
// Set Priority
RegOffset = Index / 4;
RegShift = (Index % 4) * 8;
--
2.28.0
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