[edk2-devel] [PATCH v1 2/3] ArmPkg: ArmGicLib: Added GIC v3 and v4 support to ArmGicSendSgiTo

[Kun Qin]

From: Kun Qin <kuqin at microsoft.com>

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4466

This change extended the existing function `ArmGicSendSgiTo` of ArmGicLib
to format the incoming parameters to comply with GICv3 and GICv4 spec,
and signal software generated interrupts to non secure group 1 at EL1.

Cc: Leif Lindholm <quic_llindhol at quicinc.com>
Cc: Ard Biesheuvel <ardb+tianocore at kernel.org>
Cc: Sami Mujawar <sami.mujawar at arm.com>

Signed-off-by: Kun Qin <kuqin at microsoft.com>
---
 ArmPkg/Drivers/ArmGic/ArmGicLib.c  | 52 +++++++++++++++++---
 ArmPkg/Include/Library/ArmGicLib.h | 22 +++++++++
 2 files changed, 68 insertions(+), 6 deletions(-)

diff --git a/ArmPkg/Drivers/ArmGic/ArmGicLib.c b/ArmPkg/Drivers/ArmGic/ArmGicLib.c
index 7f4bb248fc72..830d822d2c05 100644
--- a/ArmPkg/Drivers/ArmGic/ArmGicLib.c
+++ b/ArmPkg/Drivers/ArmGic/ArmGicLib.c
@@ -146,12 +146,52 @@ ArmGicSendSgiTo (
   IN  UINT8  SgiId
   )
 {
-  MmioWrite32 (
-    GicDistributorBase + ARM_GIC_ICDSGIR,
-    ((TargetListFilter & 0x3) << 24) |
-    ((CPUTargetList & 0xFF) << 16)   |
-    (SgiId & 0xF)
-    );
+  ARM_GIC_ARCH_REVISION  Revision;
+  UINT32                 ApplicableTargets;
+  UINT32                 AFF3;
+  UINT32                 AFF2;
+  UINT32                 AFF1;
+  UINT32                 AFF0;
+  UINT32                 Irm;
+  UINT64                 SGIValue;
+
+  Revision = ArmGicGetSupportedArchRevision ();
+  if (Revision == ARM_GIC_ARCH_REVISION_2) {
+    MmioWrite32 (
+      GicDistributorBase + ARM_GIC_ICDSGIR,
+      ((TargetListFilter & 0x3) << 24) |
+      ((CPUTargetList & 0xFF) << 16)   |
+      (SgiId & 0xF)
+      );
+  } else {
+    // Below routine is adopted from gicv3_raise_secure_g0_sgi in TF-A
+
+    /* Extract affinity fields from target */
+    AFF0 = GET_MPIDR_AFF0 (CPUTargetList);
+    AFF1 = GET_MPIDR_AFF1 (CPUTargetList);
+    AFF2 = GET_MPIDR_AFF2 (CPUTargetList);
+    AFF3 = GET_MPIDR_AFF3 (CPUTargetList);
+
+    /*
+     * Make target list from affinity 0, and ensure GICv3 SGI can target
+     * this PE.
+     */
+    ApplicableTargets = (1 << AFF0);
+
+    /*
+     * Evaluate the filter to see if this is for the target or all others
+     */
+    Irm = (TargetListFilter == ARM_GIC_ICDSGIR_FILTER_EVERYONEELSE) ? SGIR_IRM_TO_OTHERS : SGIR_IRM_TO_AFF;
+
+    /* Raise SGI to PE specified by its affinity */
+    SGIValue = GICV3_SGIR_VALUE (AFF3, AFF2, AFF1, SgiId, Irm, ApplicableTargets);
+
+    /*
+     * Ensure that any shared variable updates depending on out of band
+     * interrupt trigger are observed before raising SGI.
+     */
+    ArmGicV3SendNsG1Sgi (SGIValue);
+  }
 }
 
 /*
diff --git a/ArmPkg/Include/Library/ArmGicLib.h b/ArmPkg/Include/Library/ArmGicLib.h
index 773b27954522..28d58f187d4f 100644
--- a/ArmPkg/Include/Library/ArmGicLib.h
+++ b/ArmPkg/Include/Library/ArmGicLib.h
@@ -110,6 +110,28 @@
 // Bit Mask for
 #define ARM_GIC_ICCIAR_ACKINTID  0x3FF
 
+/* ICC SGI macros */
+#define SGIR_TGT_MASK     ((UINT64)0xffff)
+#define SGIR_AFF1_SHIFT   16
+#define SGIR_INTID_SHIFT  24
+#define SGIR_INTID_MASK   ((UINT64)0xf)
+#define SGIR_AFF2_SHIFT   32
+#define SGIR_IRM_SHIFT    40
+#define SGIR_IRM_MASK     ((UINT64)0x1)
+#define SGIR_AFF3_SHIFT   48
+#define SGIR_AFF_MASK     ((UINT64)0xff)
+
+#define SGIR_IRM_TO_AFF     0
+#define SGIR_IRM_TO_OTHERS  1
+
+#define GICV3_SGIR_VALUE(_aff3, _aff2, _aff1, _intid, _irm, _tgt) \
+  ((((UINT64) (_aff3) & SGIR_AFF_MASK) << SGIR_AFF3_SHIFT) | \
+   (((UINT64) (_irm) & SGIR_IRM_MASK) << SGIR_IRM_SHIFT) | \
+   (((UINT64) (_aff2) & SGIR_AFF_MASK) << SGIR_AFF2_SHIFT) | \
+   (((_intid) & SGIR_INTID_MASK) << SGIR_INTID_SHIFT) | \
+   (((_aff1) & SGIR_AFF_MASK) << SGIR_AFF1_SHIFT) | \
+   ((_tgt) & SGIR_TGT_MASK))
+
 UINT32
 EFIAPI
 ArmGicGetInterfaceIdentification (
-- 
2.41.0.windows.2



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