s390-tools/s390-tools-sles15sp1-10-zdev-Implement-support-for-early-device-configuratio.patch

Subject: zdev: Implement support for early device configuration
From: Peter Oberparleiter <oberpar@linux.ibm.com>

Summary:     zdev: Add support for handling I/O configuration data
Description: LPARs that are running in IBM Dynamic Partition Manager (DPM) mode
             can access a firmware-generated I/O configuration data file that
             contains s390-specific information about available I/O devices
             such as qeth device numbers and parameters, and FCP device IDs.

             This data file is intended to remove the need for users to
             manually enter the corresponding device data during installation.

             Linux kernels with the corresponding support make the I/O
             configuration data available at the following location:

               /sys/firmware/sclp_sd/config/data

             This patch set adds support for handling this data file using the
             chzdev and lszdev tools:

               - I/O configuration data can be applied using chzdev's --import
                 option
               - Initial RAM-Disk scripts automatically apply the
                 I/O configuration data to the system configuration
               - lszdev can be used to display the applied auto-configuration
                 data
               - chzdev can be used to manually override the
                 auto-configuration data

Upstream-ID: 156450f359bb13776fac2130a1cac00a48c2deda
Problem-ID:  LS1604

Upstream-Description:

             zdev: Implement support for early device configuration

             Enable user to specify that a device should be configured early, that is
             during the initial RAM-disk boot phase. This may be necessary, e.g. to
             override auto-configuration for a device which is also applied during
             that boot phase. It may also be used to manually specify devices that
             are required to access the root file system, such as networking devices.

             Users can mark devices as requiring early configuration by specifying
             a value of 1 for the newly added internal attribute zdev:early:

              # chzdev dasd-eckd 0.0.1234 -p zdev:early=1

             This can be changed back by removing the attribute setting, or by
             setting the attribute value to 0:

              # chzdev dasd-eckd 0.0.1234 -p -r zdev:early

             or

              # chzdev dasd-eckd 0.0.1234 -p zdev:early=0

             Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
             Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>


Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
---
 zdev/dracut/95zdev/module-setup.sh |   21 +------
 zdev/include/internal.h            |    5 +
 zdev/initramfs/hooks/zdev          |   19 ++++++
 zdev/man/chzdev.8                  |   29 ++++++++++
 zdev/src/chzdev.c                  |    4 -
 zdev/src/ctc.c                     |    2 
 zdev/src/dasd.c                    |    3 +
 zdev/src/generic_ccw.c             |    2 
 zdev/src/internal.c                |   13 ++++
 zdev/src/lcs.c                     |    2 
 zdev/src/qeth.c                    |    2 
 zdev/src/root.c                    |   82 ++++++++++++++++++++++-------
 zdev/src/zfcp_host.c               |    2 
 zdev/src/zfcp_lun.c                |    2 
 14 files changed, 152 insertions(+), 36 deletions(-)

--- a/zdev/dracut/95zdev/module-setup.sh
+++ b/zdev/dracut/95zdev/module-setup.sh
@@ -45,23 +45,12 @@ install() {
     # Hook to parse zdev kernel parameter
     inst_hook cmdline 95 "$moddir/parse-zdev.sh"
 
-    # Obtain root device configuration
-
-    # Exit early if root device type is unknown
-    if ! lszdev --by-path / >/dev/null 2>&1 ; then
-        return 0
-    fi
-
+    # Obtain early + root device configuration
     _tempfile=$(mktemp --tmpdir dracut-zdev.XXXXXX)
-
-    if chzdev --export - --persistent --by-path / >/dev/null 2>&1 ; then
-        # Use persistent configuration
-        chzdev --export "$_tempfile" --persistent --by-path / --quiet --type
-    else
-        # Use active configuration
-        chzdev --export "$_tempfile" --active --by-path / --quiet --type
-        sed -i -e 's/active/persistent/g' "$_tempfile"
-    fi
+    chzdev --export "$_tempfile" --persistent --by-path / --quiet \
+	   --type 2>/dev/null
+    chzdev --export - --persistent --by-attrib "zdev:early=1" --quiet \
+	   --type 2>/dev/null >> "$_tempfile"
 
     # Apply via --import to prevent other devices from being configured
     chzdev --import "$_tempfile" --persistent --base "/etc=$initdir/etc" \
--- a/zdev/include/internal.h
+++ b/zdev/include/internal.h
@@ -12,7 +12,12 @@
 
 #include <stdbool.h>
 
+#include "attrib.h"
+
 #define INTERNAL_ATTR_PREFIX	"zdev:"
+#define	INTERNAL_ATTR_EARLY	INTERNAL_ATTR_PREFIX "early"
+
+extern struct attrib internal_attr_early;
 
 const char *internal_get_name(const char *name);
 bool internal_by_name(const char *name);
--- a/zdev/initramfs/hooks/zdev
+++ b/zdev/initramfs/hooks/zdev
@@ -10,7 +10,8 @@
 #   configuration data during boot.
 #
 
-PREREQ=""
+# Needs to run after udev or resulting udev rules could be overwritten
+PREREQ="udev"
 
 prereqs()
 {
@@ -37,3 +38,19 @@ done
 copy_exec /sbin/chzdev
 copy_exec /sbin/lszdev
 copy_exec /sbin/vmcp
+
+_tempfile=$(mktemp --tmpdir initramfs-zdev.XXXXXX)
+
+# Obtain early + root device configuration
+chzdev --export "$_tempfile" --persistent --by-path / \
+       --by-attrib "zdev:early=1" --quiet --type 2>/dev/null
+
+# Apply via --import to prevent other devices from being configured.
+# Rename the resulting cio-ignore rule to ensure that it does not override
+# the one copied by the initramfs udev hook to /lib/udev.
+chzdev --import "$_tempfile" --persistent \
+       --base "/etc/udev/rules.d/41-cio-ignore.rules=$DESTDIR/etc/udev/rules.d/41-cio-ignore-root.rules" \
+       --base "/etc=$DESTDIR/etc" --yes --quiet --no-root-update --force \
+       >/dev/null
+
+rm -f "$_tempfile"
--- a/zdev/man/chzdev.8
+++ b/zdev/man/chzdev.8
@@ -334,6 +334,35 @@ a specific attribute.
 .PP
 .
 .
+.SS "Special settings"
+The following special settings affect how devices are handled by chzdev:
+.PP
+.
+.BR zdev:early =0|1
+.RS 4
+Control in which stage of the boot process a device is activated:
+.TP 4
+.B 0
+Device is activated normally during boot (default).
+.PP
+.TP 4
+.B 1
+Device is activated early in the boot process, by the initial RAM-disk.
+.PP
+Specify a value of 1 for this attribute in any of the following situations:
+.TP 4
+\(bu
+To ensure that your settings override auto-configuration settings.
+.PP
+.TP 4
+\(bu
+To ensure that a device required to access the root file system is correctly
+enabled during boot. An example would be a networking device, or a device that
+is intended to extend a logical volume that provides the root file system.
+.PP
+.RE
+.
+.
 .SH ACTIONS
 You can use one of the action options listed below to specify the
 .B main tool action
--- a/zdev/src/chzdev.c
+++ b/zdev/src/chzdev.c
@@ -3025,8 +3025,8 @@ int main(int argc, char *argv[])
 
 	if ((pers_mod_devs || pers_mod_devtypes) && !opts.no_root_check &&
 	    !dryrun) {
-		/* If the root device/device type has been modified, additional
-		 * work might be necessary. */
+		/* If the root device/device type or early devices have been
+		 * modified, additional work might be necessary. */
 		rc = root_check();
 		if (rc && !drc)
 			drc = rc;
--- a/zdev/src/ctc.c
+++ b/zdev/src/ctc.c
@@ -17,6 +17,7 @@
 #include "ctc_auto.h"
 #include "device.h"
 #include "devtype.h"
+#include "internal.h"
 #include "misc.h"
 #include "namespace.h"
 #include "path.h"
@@ -425,6 +426,7 @@ static struct subtype ctc_subtype = {
 		&ccw_attr_online,
 		&ctc_attr_buffer,
 		&ctc_attr_protocol,
+		&internal_attr_early,
 	),
 	.unknown_dev_attribs	= 1,
 	.support_definable	= 1,
--- a/zdev/src/dasd.c
+++ b/zdev/src/dasd.c
@@ -16,6 +16,7 @@
 #include "dasd.h"
 #include "device.h"
 #include "devtype.h"
+#include "internal.h"
 #include "misc.h"
 #include "modprobe.h"
 #include "module.h"
@@ -616,6 +617,7 @@ struct subtype dasd_subtype_eckd = {
 		&dasd_attr_reservation_policy,
 		&dasd_attr_last_known_reservation_state,
 		&dasd_attr_safe_offline,
+		&internal_attr_early,
 	),
 	.unknown_dev_attribs	= 1,
 
@@ -651,6 +653,7 @@ struct subtype dasd_subtype_fba = {
 		&dasd_attr_reservation_policy,
 		&dasd_attr_last_known_reservation_state,
 		&dasd_attr_safe_offline,
+		&internal_attr_early,
 	),
 	.unknown_dev_attribs	= 1,
 
--- a/zdev/src/generic_ccw.c
+++ b/zdev/src/generic_ccw.c
@@ -17,6 +17,7 @@
 #include "devnode.h"
 #include "devtype.h"
 #include "generic_ccw.h"
+#include "internal.h"
 #include "namespace.h"
 #include "path.h"
 #include "subtype.h"
@@ -182,6 +183,7 @@ static struct subtype generic_ccw_subtyp
 	.dev_attribs = ATTRIB_ARRAY(
 		&ccw_attr_online,
 		&ccw_attr_cmb_enable,
+		&internal_attr_early,
 	),
 	.unknown_dev_attribs	= 1,
 	.generic		= 1,
--- a/zdev/src/internal.c
+++ b/zdev/src/internal.c
@@ -9,9 +9,22 @@
 
 #include <stdbool.h>
 
+#include "attrib.h"
 #include "internal.h"
 #include "misc.h"
 
+struct attrib internal_attr_early = {
+	.name = INTERNAL_ATTR_EARLY,
+	.title = "Activate device early during boot",
+	.desc = "Control the time of activation of a device:\n"
+		"  0: Device is activated normally during boot\n"
+		"  1: Device is activated early in the boot process, by the\n"
+		"     initial RAM-disk\n",
+	.defval = "0",
+	.accept = ACCEPT_ARRAY(ACCEPT_RANGE(0, 1)),
+	.internal = 1,
+};
+
 /* Return identifier of internal attribute with specified @name. */
 const char *internal_get_name(const char *name)
 {
--- a/zdev/src/lcs.c
+++ b/zdev/src/lcs.c
@@ -15,6 +15,7 @@
 #include "ccwgroup.h"
 #include "device.h"
 #include "devtype.h"
+#include "internal.h"
 #include "lcs.h"
 #include "lcs_auto.h"
 #include "misc.h"
@@ -362,6 +363,7 @@ static struct subtype lcs_subtype = {
 		&ccw_attr_online,
 		&lcs_attr_lancmd_timeout,
 		&lcs_attr_recover,
+		&internal_attr_early,
 	),
 	.unknown_dev_attribs	= 1,
 	.support_definable	= 1,
--- a/zdev/src/qeth.c
+++ b/zdev/src/qeth.c
@@ -15,6 +15,7 @@
 #include "ccwgroup.h"
 #include "device.h"
 #include "devtype.h"
+#include "internal.h"
 #include "misc.h"
 #include "namespace.h"
 #include "nic.h"
@@ -1445,6 +1446,7 @@ struct subtype qeth_subtype_qeth = {
 		&qeth_attr_vnicc_takeover_learning,
 		&qeth_attr_vnicc_bridge_invisible,
 		&qeth_attr_vnicc_rx_bcast,
+		&internal_attr_early,
 	),
 	.unknown_dev_attribs	= 1,
 	.support_definable	= 1,
--- a/zdev/src/root.c
+++ b/zdev/src/root.c
@@ -8,11 +8,13 @@
  */
 
 #include <stdlib.h>
+#include <string.h>
 
 #include "lib/util_path.h"
 
 #include "device.h"
 #include "devtype.h"
+#include "internal.h"
 #include "misc.h"
 #include "path.h"
 #include "root.h"
@@ -20,31 +22,78 @@
 #include "setting.h"
 #include "subtype.h"
 
-/* Determine if the root device was modified. If it was modified, run the
- * corresponding root-install scripts. */
+static bool is_early_removed(struct device *dev)
+{
+	struct setting *s;
+
+	s = setting_list_find(dev->persistent.settings,
+			      internal_attr_early.name);
+	if (!s || !s->modified)
+		return false;
+	if (!s->actual_value || strcmp(s->actual_value, "1") != 0)
+		return false;
+	if (s->removed || strcmp(s->value, "0") == 0)
+		return true;
+	return false;
+}
+
+static void add_early_removed(struct util_list *selected)
+{
+	int i, j;
+	struct devtype *dt;
+	struct subtype *st;
+	struct device *dev;
+
+	for (i = 0; devtypes[i]; i++) {
+		dt = devtypes[i];
+		for (j = 0; dt->subtypes[j]; j++) {
+			st = dt->subtypes[j];
+			util_list_iterate(&st->devices->hash.list, dev) {
+				if (is_early_removed(dev)) {
+					selected_dev_list_add(selected, dt, st,
+						dev->id, NULL, EXIT_OK);
+				}
+			}
+		}
+	}
+}
+
+/* Determine if initial RAM-disk needs updating. If so, run the corresponding
+ * scripts if available. */
 exit_code_t root_check(void)
 {
 	struct util_list *selected, *params, *mod = NULL;
 	struct selected_dev_node *sel;
 	struct device *dev;
 	char *params_str;
-	exit_code_t rc;
+	exit_code_t rc = EXIT_OK;
 	struct strlist_node *s;
 	struct devtype *dt;
+	struct select_opts *select;
 
-	debug("Checking for modified root device configuration\n");
+	debug("Checking for required initial RAM-disk update\n");
 
-	/* Get list of devices that provide the root device. */
+	/* Get list of devices that provide the root device or require
+	 * early configuration. */
 	selected = selected_dev_list_new();
-	rc = select_by_path(NULL, selected, config_active, scope_mandatory,
-			    NULL, NULL, PATH_ROOT, err_ignore);
-	if (rc) {
+	/* First add devices that had zdev:early removed or changed to 0.
+	 * The subsequent call to select_devices() will filter out any
+	 * duplicates. */
+	add_early_removed(selected);
+	/* Now add devices required for root file system. */
+	if (select_by_path(NULL, selected, config_active, scope_mandatory,
+			   NULL, NULL, PATH_ROOT, err_ignore)) {
 		/* Running from an unknown root device is not an error. */
 		verb("Note: Could not determine if root device configuration "
 		     "needs to be updated\n");
-		rc = 0;
-		goto out;
 	}
+	/* Finally add devices with zdev:early=1. */
+	select = select_opts_new();
+	strlist_add(&select->by_attr, "%s=1", INTERNAL_ATTR_EARLY);
+	select_devices(select, selected, 1, 0, 0,
+		       config_active | config_persistent, scope_mandatory,
+		       err_ignore);
+	select_opts_free(select);
 
 	/* Determine if any of the devices or device types has been modified. */
 	mod = strlist_new();
@@ -68,19 +117,18 @@ exit_code_t root_check(void)
 
 	if (util_list_is_empty(mod))
 		goto out;
-	info("Note: Some of the changes affect devices providing the root "
-	     "file system:\n");
+	info("Note: The initial RAM-disk must be updated for these changes to take effect:\n");
 	util_list_iterate(mod, s)
 		info("       - %s\n", s->str);
-	info("      Additional steps such as rebuilding the RAM-disk might be "
-	     "required.\n");
 
 	/* Check if script is available. */
-	if (!util_path_is_reg_file(PATH_ROOT_SCRIPT))
+	if (!util_path_is_reg_file(PATH_ROOT_SCRIPT)) {
+		warn("A manual update of the initial RAM-disk is required.\n");
 		goto out;
+	}
 
 	/* Ask for confirmation. */
-	if (!confirm("Update persistent root device configuration now?")) {
+	if (!confirm("Update initial RAM-disk now?")) {
 		rc = EXIT_ABORTED;
 		goto out;
 	}
@@ -97,7 +145,7 @@ exit_code_t root_check(void)
 	/* Run update command. */
 	if (misc_system(err_delayed_print, "%s %s", PATH_ROOT_SCRIPT,
 			params_str) != 0) {
-		error("Failure while updating root device configuration\n");
+		error("Failure while updating initial RAM-disk\n");
 		delayed_print(DELAY_INDENT);
 		rc = EXIT_RUNTIME_ERROR;
 	}
--- a/zdev/src/zfcp_host.c
+++ b/zdev/src/zfcp_host.c
@@ -17,6 +17,7 @@
 #include "ccw.h"
 #include "device.h"
 #include "devtype.h"
+#include "internal.h"
 #include "misc.h"
 #include "path.h"
 #include "setting.h"
@@ -247,6 +248,7 @@ struct subtype zfcp_host_subtype = {
 		&zfcp_host_attr_failed,
 		&zfcp_host_attr_port_remove,
 		&zfcp_host_attr_port_rescan,
+		&internal_attr_early,
 	),
 	.unknown_dev_attribs	= 1,
 
--- a/zdev/src/zfcp_lun.c
+++ b/zdev/src/zfcp_lun.c
@@ -21,6 +21,7 @@
 #include "devnode.h"
 #include "devtype.h"
 #include "misc.h"
+#include "internal.h"
 #include "namespace.h"
 #include "path.h"
 #include "scsi.h"
@@ -1097,6 +1098,7 @@ struct subtype zfcp_lun_subtype = {
 		&zfcp_lun_attr_scsi_timeout,
 		&zfcp_lun_attr_scsi_state,
 		&zfcp_lun_attr_scsi_delete,
+		&internal_attr_early,
 	),
 	.prefixes = STRING_ARRAY(SCSI_ATTR_PREFIX),
 	.unknown_dev_attribs	= 1,