[edk2-devel] [PATCH 1/2] Platform/SbsaQemu: get the information of CPU topology via SMC calls

["Xiong Yining" <xiongyining1480@phytium.com.cn>]

Provide functions to check for CPU topology information:
- the number of sockets on sbsa-ref platform.
- the number of clusters in one socket.
- the number of cores in one cluster.
- the number of threads in one cores.

As SMC calls can return up to 4 return values. the number of
sockets, clusters and cores are read from TF-A using platform
specific SMC calls. And the number of threads is caluculated
using the total number of cpus and the number of sockets,
clusters and cores.

Signed-off-by: Xiong Yining <xiongyining1480@phytium.com.cn>
---
 .../Include/IndustryStandard/SbsaQemuSmc.h    |  1 +
 .../Include/Library/HardwareInfoLib.h         | 26 +++++++++++++++
 .../SbsaQemuHardwareInfoLib.c                 | 33 +++++++++++++++++++
 3 files changed, 60 insertions(+)

diff --git a/Silicon/Qemu/SbsaQemu/Include/IndustryStandard/SbsaQemuSmc.h b/Silicon/Qemu/SbsaQemu/Include/IndustryStandard/SbsaQemuSmc.h
index e3092007d27d..9d9780ca70fe 100644
--- a/Silicon/Qemu/SbsaQemu/Include/IndustryStandard/SbsaQemuSmc.h
+++ b/Silicon/Qemu/SbsaQemu/Include/IndustryStandard/SbsaQemuSmc.h
@@ -16,6 +16,7 @@
 #define SIP_SVC_GET_GIC_ITS    SMC_SIP_FUNCTION_ID(101)
 #define SIP_SVC_GET_CPU_COUNT  SMC_SIP_FUNCTION_ID(200)
 #define SIP_SVC_GET_CPU_NODE   SMC_SIP_FUNCTION_ID(201)
+#define SIP_SVC_GET_CPU_TOPOLOGY SMC_SIP_FUNCTION_ID(202)
 #define SIP_SVC_GET_MEMORY_NODE_COUNT SMC_SIP_FUNCTION_ID(300)
 #define SIP_SVC_GET_MEMORY_NODE SMC_SIP_FUNCTION_ID(301)
 
diff --git a/Silicon/Qemu/SbsaQemu/Include/Library/HardwareInfoLib.h b/Silicon/Qemu/SbsaQemu/Include/Library/HardwareInfoLib.h
index 46fdad45353c..3e451ee344c7 100644
--- a/Silicon/Qemu/SbsaQemu/Include/Library/HardwareInfoLib.h
+++ b/Silicon/Qemu/SbsaQemu/Include/Library/HardwareInfoLib.h
@@ -15,6 +15,19 @@ typedef struct{
   UINT64  AddressSize;
 } MemoryInfo;
 
+/**
+  Sockets: the number of sockets on sbsa-ref platform.
+  Clusters: the number of clusters in one socket.
+  Cores: the number of cores in one cluster.
+  Threads: the number of threads in one core.
+**/
+typedef struct{
+  UINT32 Sockets;
+  UINT32 Clusters;
+  UINT32 Cores;
+  UINT32 Threads;
+} CpuTopology;
+
 /**
   Get CPU count from information passed by Qemu.
 
@@ -83,4 +96,17 @@ GetNumaNodeCount (
   VOID
   );
 
+/**
+  Get cpu topology(sockets, clusters, cores, threads) from device tree passed by Qemu.
+
+  @param [out]  CpuTopo     A pointer to the cpu topology.
+
+
+  @retval                   the information of cpu topology.
+**/
+VOID
+GetCpuTopology (
+  OUT CpuTopology *CpuTopo
+  );
+
 #endif /* HARDWARE_INFO_LIB */
diff --git a/Silicon/Qemu/SbsaQemu/Library/SbsaQemuHardwareInfoLib/SbsaQemuHardwareInfoLib.c b/Silicon/Qemu/SbsaQemu/Library/SbsaQemuHardwareInfoLib/SbsaQemuHardwareInfoLib.c
index 4c22e7d6ee47..a12dc0244da5 100644
--- a/Silicon/Qemu/SbsaQemu/Library/SbsaQemuHardwareInfoLib/SbsaQemuHardwareInfoLib.c
+++ b/Silicon/Qemu/SbsaQemu/Library/SbsaQemuHardwareInfoLib/SbsaQemuHardwareInfoLib.c
@@ -179,3 +179,36 @@ GetNumaNodeCount (
 
   return NumberNumaNodes;
 }
+
+/**
+  Get CPU topology.
+**/
+VOID
+GetCpuTopology (
+  OUT CpuTopology *CpuTopo
+  )
+{
+  UINTN          SmcResult;
+  UINTN          Arg0;
+  UINTN          Arg1;
+  UINTN          Arg2;
+  UINT32         NumCores = GetCpuCount();
+
+  SmcResult = ArmCallSmc0(SIP_SVC_GET_CPU_TOPOLOGY, &Arg0, &Arg1, &Arg2);
+  if (SmcResult != SMC_SIP_CALL_SUCCESS) {
+    DEBUG ((DEBUG_ERROR, "%a: SIP_SVC_GET_CPU_TOPOLOGY call failed. We have no cpu topology information.\n", __FUNCTION__));
+    ResetShutdown ();
+  } else {
+    CpuTopo->Sockets = Arg0;
+    CpuTopo->Clusters = Arg1;
+    CpuTopo->Cores = Arg2;
+    CpuTopo->Threads = NumCores / (CpuTopo->Sockets * CpuTopo->Clusters * CpuTopo->Cores);
+  }
+
+  DEBUG(( DEBUG_INFO, "%a: CPU Topology: sockets are %d, clusters are %d, cores are %d, threads are %d\n",
+      __FUNCTION__,
+      CpuTopo->Sockets,
+      CpuTopo->Clusters,
+      CpuTopo->Cores,
+      CpuTopo->Threads ));
+}
\ No newline at end of file
-- 
2.34.1



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