[PATCH 14/15] add a domU script to fetch overlays and applying them to linux

[Henry Wang <xin.wang2@xxxxxxx>]

From: Vikram Garhwal <fnu.vikram@xxxxxxxxxx>

Introduce a shell script that runs in the background and calls
get_overlay to retrive overlays and add them (or remove them) to Linux
device tree (running as a domU).

Signed-off-by: Vikram Garhwal <fnu.vikram@xxxxxxxxxx>
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
Signed-off-by: Henry Wang <xin.wang2@xxxxxxx>
---
 tools/helpers/Makefile       |  2 +-
 tools/helpers/get_overlay.sh | 81 ++++++++++++++++++++++++++++++++++++
 2 files changed, 82 insertions(+), 1 deletion(-)
 create mode 100755 tools/helpers/get_overlay.sh

diff --git a/tools/helpers/Makefile b/tools/helpers/Makefile
index dfe17ef269..2d0558aeb8 100644
--- a/tools/helpers/Makefile
+++ b/tools/helpers/Makefile
@@ -58,7 +58,6 @@ init-dom0less: $(INIT_DOM0LESS_OBJS)
 get_overlay: $(SHARE_OVERLAY_OBJS)
        $(CC) $(LDFLAGS) -o $@ $< $(LDLIBS_libxenvchan) $(LDLIBS_libxenstore) 
$(LDLIBS_libxenctrl) $(LDLIBS_libxengnttab) $(APPEND_LDFLAGS)
 
-
 .PHONY: install
 install: all
        $(INSTALL_DIR) $(DESTDIR)$(LIBEXEC_BIN)
@@ -67,6 +66,7 @@ install: all
 .PHONY: uninstall
 uninstall:
        for i in $(TARGETS); do rm -f $(DESTDIR)$(LIBEXEC_BIN)/$$i; done
+       $(RM) $(DESTDIR)$(LIBEXEC_BIN)/get_overlay.sh
 
 .PHONY: clean
 clean:
diff --git a/tools/helpers/get_overlay.sh b/tools/helpers/get_overlay.sh
new file mode 100755
index 0000000000..2e8c6ecefd
--- /dev/null
+++ b/tools/helpers/get_overlay.sh
@@ -0,0 +1,81 @@
+#!/bin/sh
+
+modprobe xen_gntalloc
+modprobe xen_gntdev
+
+while :
+do
+    overlay_node_name=""
+    type_overlay="normal"
+    is_partial_dtb=""
+
+    output=`/usr/lib/xen/bin/get_overlay 0`
+
+    if test $? -ne 0
+    then
+        echo error
+        exit 1
+    fi
+
+    if test -z "$output"
+    then
+        echo ""
+        exit 1
+    fi
+
+    # output: add overlay-name normal partial
+    operation=`echo $output | cut -d " " -f 1`
+    overlay_node_name=`echo $output | cut -d " " -f 2`
+    type_overlay=`echo $output | cut -d " " -f 3`
+    is_partial_dtb=`echo $output | cut -d " " -f 4`
+
+    if test -z "$operation" || test -z "$overlay_node_name"
+    then
+        echo "invalid ops"
+        exit 1
+    fi
+
+    if test $operation = "add"
+    then
+        echo "Overlay received"
+
+        if test "$type_overlay" = "normal"
+        then
+            
final_path="/sys/kernel/config/device-tree/overlays/$overlay_node_name"
+            mkdir -p $final_path
+            cat overlay.dtbo > $final_path/dtbo
+        else
+            # fpga overlay
+            cp overlay.dtbo lib/firmware/
+            mkdir /configfs
+            mount -t configfs configfs /configfs
+            cd /configfs/device-tree/overlays/
+
+            if test "$is_partial_dtb"
+            then
+                mkdir partial
+                echo 1 > /sys/class/fpga_manager/fpga0/flags
+                echo -n "overlay.dtbo" > /configfs/device-tree/overlays/partial
+            else
+                mkdir full
+                echo -n "overlay.dtbo" > /configfs/device-tree/overlays/full
+            fi
+        fi
+    elif test $operation = "remove"
+    then
+        if test "$type_overlay" = "normal"
+        then
+            # implement remove
+            
path=/sys/kernel/config/device-tree/overlays/$overlay_node_name/dtbo
+            if ! test -f $path
+            then
+                echo "error: path doesn't exist"
+                exit 1
+            fi
+            rm $path
+        fi
+    else
+        echo "operation unsupported"
+        exit 1
+    fi
+done
-- 
2.34.1