From: Brian Brooks <brian.brooks@arm.com>
Date: Wed, 6 Sep 2017 18:19:48 +0000 (-0500)
Subject: Improved arm64 chip detection
X-Git-Tag: v17.10-rc1~100
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=a7191840beeb2c3a0f2598707ed1051a9f23c45f;p=vpp.git

Improved arm64 chip detection

Use ARMv8 Main ID Register (exposed thru /proc/cpuinfo) to identify
the CPU implementor and part number. For further details, see the
ARMv8 ARM D7.2.66.

Change-Id: I2b0d0b165cda4ab9fc57c645af90e9e354b73f44
Signed-off-by: Brian Brooks <brian.brooks@arm.com>
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Signed-off-by: Ola Liljedahl <ola.liljedahl@arm.com>
Reviewed-by: Song Zhu <song.zhu@arm.com>
---

diff --git a/dpdk/Makefile b/dpdk/Makefile
index 4d8dea283b3..afe50c4ba7b 100644
--- a/dpdk/Makefile
+++ b/dpdk/Makefile
@@ -75,29 +75,64 @@ ifeq ($(MACHINE),$(filter $(MACHINE),x86_64 i686))
 DPDK_TARGET           ?= $(MACHINE)-native-linuxapp-$(DPDK_CC)
 DPDK_MACHINE          ?= nhm
 DPDK_TUNE             ?= core-avx2
+
+##############################################################################
+# ARM64
+##############################################################################
 else ifeq ($(MACHINE),aarch64)
 export CROSS=""
-ifneq (,$(findstring thunder,$(shell [[ -f /sys/bus/pci/devices/0000:00:01.0/uevent ]] && cat /sys/bus/pci/devices/0000:00:01.0/uevent | grep cavium)))
+DPDK_TARGET           ?= arm64-armv8a-linuxapp-$(DPDK_CC)
+DPDK_MACHINE          ?= armv8a
+DPDK_TUNE             ?= generic
+
+CPU_IMP_ARM                     = 0x41
+CPU_IMP_CAVIUM                  = 0x43
+
+CPU_PART_ARM_CORTEX_A53         = 0xd03
+CPU_PART_ARM_CORTEX_A57         = 0xd07
+CPU_PART_ARM_CORTEX_A72         = 0xd08
+CPU_PART_ARM_CORTEX_A73         = 0xd09
+
+CPU_PART_CAVIUM_THUNDERX        = 0x0a1
+CPU_PART_CAVIUM_THUNDERX_81XX   = 0x0a2
+CPU_PART_CAVIUM_THUNDERX_83XX   = 0x0a3
+
+MIDR_IMPLEMENTER=$(shell awk '/implementer/ {print $$4;exit}' /proc/cpuinfo)
+MIDR_PARTNUM=$(shell awk '/part/ {print $$4;exit}' /proc/cpuinfo)
+
+ifeq ($(MIDR_IMPLEMENTER),$(CPU_IMP_ARM))
 ##############################################################################
-# Cavium ThunderX
+# Arm Cortex
 ##############################################################################
-DPDK_TARGET           ?= arm64-thunderx-linuxapp-$(DPDK_CC)
-DPDK_MACHINE          ?= thunderx
-DPDK_TUNE             ?= generic
+CPU_PART_ARM_TUNE := $(CPU_PART_ARM_CORTEX_A53)/cortex-a53 \
+		     $(CPU_PART_ARM_CORTEX_A57)/cortex-a57 \
+		     $(CPU_PART_ARM_CORTEX_A72)/cortex-a72 \
+		     $(CPU_PART_ARM_CORTEX_A73)/cortex-a73
+CPU_TUNE = $(notdir $(filter $(MIDR_PARTNUM)/%,$(CPU_PART_ARM_TUNE)))
+ifneq ($(CPU_TUNE),)
+DPDK_TUNE             = $(CPU_TUNE)
 else
+$(warning Unknown Arm CPU)
+endif
+
+else ifeq ($(MIDR_IMPLEMENTER),$(CPU_IMP_CAVIUM))
 ##############################################################################
-# Generic ARM64
+# Cavium ThunderX
 ##############################################################################
-DPDK_TARGET           ?= arm64-armv8a-linuxapp-$(DPDK_CC)
-DPDK_MACHINE          ?= armv8a
-DPDK_TUNE             ?= generic
+ifneq (,$(findstring $(MIDR_PARTNUM),$(CPU_PART_CAVIUM_THUNDERX) \
+	$(CPU_PART_CAVIUM_THUNDERX_81XX) $(CPU_PART_CAVIUM_THUNDERX_83XX)))
+DPDK_TARGET           = arm64-thunderx-linuxapp-$(DPDK_CC)
+DPDK_MACHINE          = thunderx
+else
+$(warning Unknown Cavium CPU)
+endif
 endif
 
 ##############################################################################
-# Unknown platofrm
+# Unknown platform
 ##############################################################################
 else
-$(error unknown platform)
+$(error Unknown platform)
 endif
 
 # /proc/cpuinfo does not exist on platforms without a /proc and on some