[kdump]: Kdump usability and reliability improvements (#6113)

- Allow platform specific reboot script to be called after crash kernel has
finished copying the kernel vmcore
- Disable pcie advanced features when running crash kernel. This improves
reliability of the crash kernel to successfully create a vmcore and also
reboot
- Allow crash kernel to reboot if a panic is seen while it is generating a
vmcore
- Fix crash kernel to use the SONiC specific /usr/local/bin/reboot script
instead of the Linux reboot command /sbin/reboot
- Use sonic_platform as the kernel command line parameter to pass platform identifier string

Signed-off-by: Rajendra Dendukuri <rajendra.dendukuri@broadcom.com>

files/build_templates/sonic_debian_extension.j2

@@ -285,6 +285,7 @@ sudo sed -i -e '/^passwd/s/ tacplus//' $FILESYSTEM_ROOT/etc/nsswitch.conf
 if [[ $CONFIGURED_ARCH == amd64 ]]; then
 sudo DEBIAN_FRONTEND=noninteractive dpkg --root=$FILESYSTEM_ROOT -i $debs_path/kdump-tools_*.deb || \
     sudo LANG=C DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true chroot $FILESYSTEM_ROOT apt-get -q --no-install-suggests --no-install-recommends --force-no install
+    cat $IMAGE_CONFIGS/kdump/kdump-tools | sudo tee -a $FILESYSTEM_ROOT/etc/default/kdump-tools > /dev/null
 fi
 
 # Install python-swss-common package and all its dependent packages

files/image_config/kdump/kdump-tools

@@ -0,0 +1,13 @@
+# ---------------------------------------------------------------------------
+# Additional Kdump environment settings used in SONiC
+#
+
+# Reboot crash kernel on panic
+# Enable debug level logging of crash kernel for better visibility
+# Disable advanced pcie features
+# Disable high precision event timer as on some platforms it is interfering with the kdump operation
+# Pass platform identifier string as part of crash kernel command line to be used by the reboot script during kdump
+KDUMP_CMDLINE_APPEND+=" panic=10 debug hpet=disable pcie_port=compat pci=nommconf sonic_platform=__PLATFORM__"
+
+# Use SONiC reboot wrapper script present in /usr/local/bin post kdump
+PATH=/usr/local/bin:$PATH

files/image_config/platform/rc.local

@@ -365,6 +365,9 @@ if [ -f $FIRST_BOOT_FILE ]; then
     # Firsttime ebtables configuration
     ebtables_config
 
+    # Kdump tools configuration
+    sed -i -e "s/__PLATFORM__/$platform/g" /etc/default/kdump-tools
+
     firsttime_exit
 fi