package/linux-tools: add support for pcitest tool

Add support for selection and compiling the pcitest tool on buildroot.

This tool is available to be compiled since kernel 4.20.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/linux-tools/Config.in

@@ -34,6 +34,15 @@ config BR2_PACKAGE_LINUX_TOOLS_IIO
 
 	  These tools are available only from kernel version 4.7.
 
+config BR2_PACKAGE_LINUX_TOOLS_PCI
+	bool "pci"
+	select BR2_PACKAGE_LINUX_TOOLS
+	help
+	  pcitest is a tool for testing capabilities related to a
+	  PCI Endpoint (only works with specific Endpoints).
+
+	  These tools are available only from kernel version 4.20.
+
 config BR2_PACKAGE_LINUX_TOOLS_PERF
 	bool "perf"
 	select BR2_PACKAGE_LINUX_TOOLS

package/linux-tools/linux-tool-pci.mk.in

@@ -0,0 +1,27 @@
+################################################################################
+#
+# pci
+#
+################################################################################
+
+LINUX_TOOLS += pci
+
+PCI_MAKE_OPTS = $(LINUX_MAKE_FLAGS)
+
+define PCI_BUILD_CMDS
+	$(Q)if ! grep install $(LINUX_DIR)/tools/pci/Makefile >/dev/null 2>&1 ; then \
+		echo "Your kernel version is too old and does not have install section in the pci tools." ; \
+		echo "At least kernel 4.20 must be used." ; \
+		exit 1 ; \
+	fi
+
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(LINUX_DIR)/tools/pci \
+		$(PCI_MAKE_OPTS)
+endef
+
+define PCI_INSTALL_TARGET_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(LINUX_DIR)/tools/pci \
+		$(PCI_MAKE_OPTS) \
+		DESTDIR=$(TARGET_DIR) \
+		install
+endef