[edk2-devel] [PATCH edk2-platforms v3 1/5] SbsaQemu: get the information of CPU topology via SMC calls

["Marcin Juszkiewicz" <marcin.juszkiewicz@linaro.org>]

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 core.

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 call.
Number of threads is caluculated using the cpu count and the number of
sockets, clusters and cores.

Signed-off-by: Xiong Yining <xiongyining1480@phytium.com.cn>
Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
---
 .../SbsaQemu/Include/IndustryStandard/SbsaQemuSmc.h  |  1 +
 .../Qemu/SbsaQemu/Include/Library/HardwareInfoLib.h  | 26 ++++++++++++++
 .../SbsaQemuHardwareInfoLib.c                        | 36 ++++++++++++++++++++
 3 files changed, 63 insertions(+)

diff --git a/Silicon/Qemu/SbsaQemu/Include/IndustryStandard/SbsaQemuSmc.h b/Silicon/Qemu/SbsaQemu/Include/IndustryStandard/SbsaQemuSmc.h
index af6b120561ad..b57573735ace 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 e5076274fa0a..cef6f6f58194 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 596a3453c70f..b17a2ae99b4e 100644
--- a/Silicon/Qemu/SbsaQemu/Library/SbsaQemuHardwareInfoLib/SbsaQemuHardwareInfoLib.c
+++ b/Silicon/Qemu/SbsaQemu/Library/SbsaQemuHardwareInfoLib/SbsaQemuHardwareInfoLib.c
@@ -181,3 +181,39 @@ 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
+    ));
+}

-- 
2.45.2



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