From: Jan Höppner <hoeppner@linux.ibm.com>
Subject: s390/dasd: Prepare for additional path event handling
References: jsc#SLE-13767 bsc#1178420 LTC#185092
Patch-mainline: v5.11-rc1
Git-commit: b72949328869dfd45f6452c2410647afd7db5f1a

As more path events need to be handled for ECKD the current path
verification infrastructure can be reused. Rename all path verifcation
code to fit the more broadly based task of path event handling and put
the path verification in a new separate function.

Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/s390/block/dasd.c      |    4 +-
 drivers/s390/block/dasd_eckd.c |   78 +++++++++++++++++++++++------------------
 drivers/s390/block/dasd_int.h  |    1 
 3 files changed, 47 insertions(+), 36 deletions(-)

--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -2115,8 +2115,8 @@ static void __dasd_device_check_path_eve
 	if (device->stopped &
 	    ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
 		return;
-	rc = device->discipline->verify_path(device,
-					     dasd_path_get_tbvpm(device));
+	rc = device->discipline->pe_handler(device,
+					    dasd_path_get_tbvpm(device));
 	if (rc)
 		dasd_device_set_timer(device, 50);
 	else
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -103,7 +103,7 @@ struct ext_pool_exhaust_work_data {
 };
 
 /* definitions for the path verification worker */
-struct path_verification_work_data {
+struct pe_handler_work_data {
 	struct work_struct worker;
 	struct dasd_device *device;
 	struct dasd_ccw_req cqr;
@@ -112,8 +112,8 @@ struct path_verification_work_data {
 	int isglobal;
 	__u8 tbvpm;
 };
-static struct path_verification_work_data *path_verification_worker;
-static DEFINE_MUTEX(dasd_path_verification_mutex);
+static struct pe_handler_work_data *pe_handler_worker;
+static DEFINE_MUTEX(dasd_pe_handler_mutex);
 
 struct check_attention_work_data {
 	struct work_struct worker;
@@ -1249,7 +1249,7 @@ static int verify_fcx_max_data(struct da
 }
 
 static int rebuild_device_uid(struct dasd_device *device,
-			      struct path_verification_work_data *data)
+			      struct pe_handler_work_data *data)
 {
 	struct dasd_eckd_private *private = device->private;
 	__u8 lpm, opm = dasd_path_get_opm(device);
@@ -1287,10 +1287,9 @@ static int rebuild_device_uid(struct das
 	return rc;
 }
 
-static void do_path_verification_work(struct work_struct *work)
+static void dasd_eckd_path_available_action(struct dasd_device *device,
+					    struct pe_handler_work_data *data)
 {
-	struct path_verification_work_data *data;
-	struct dasd_device *device;
 	struct dasd_eckd_private path_private;
 	struct dasd_uid *uid;
 	__u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
@@ -1300,19 +1299,6 @@ static void do_path_verification_work(st
 	char print_uid[60];
 	int rc, pos;
 
-	data = container_of(work, struct path_verification_work_data, worker);
-	device = data->device;
-
-	/* delay path verification until device was resumed */
-	if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
-		schedule_work(work);
-		return;
-	}
-	/* check if path verification already running and delay if so */
-	if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
-		schedule_work(work);
-		return;
-	}
 	opm = 0;
 	npm = 0;
 	ppm = 0;
@@ -1459,30 +1445,54 @@ static void do_path_verification_work(st
 
 		dasd_path_create_kobj(device, pos);
 	}
+}
+
+static void do_pe_handler_work(struct work_struct *work)
+{
+	struct pe_handler_work_data *data;
+	struct dasd_device *device;
+
+	data = container_of(work, struct pe_handler_work_data, worker);
+	device = data->device;
+
+	/* delay path verification until device was resumed */
+	if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
+		schedule_work(work);
+		return;
+	}
+	/* check if path verification already running and delay if so */
+	if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
+		schedule_work(work);
+		return;
+	}
+
+	dasd_eckd_path_available_action(device, data);
+
 	clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
 	dasd_put_device(device);
 	if (data->isglobal)
-		mutex_unlock(&dasd_path_verification_mutex);
+		mutex_unlock(&dasd_pe_handler_mutex);
 	else
 		kfree(data);
 }
 
-static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
+static int dasd_eckd_pe_handler(struct dasd_device *device, __u8 lpm)
 {
-	struct path_verification_work_data *data;
+	struct pe_handler_work_data *data;
 
 	data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
 	if (!data) {
-		if (mutex_trylock(&dasd_path_verification_mutex)) {
-			data = path_verification_worker;
+		if (mutex_trylock(&dasd_pe_handler_mutex)) {
+			data = pe_handler_worker;
 			data->isglobal = 1;
-		} else
+		} else {
 			return -ENOMEM;
+		}
 	} else {
 		memset(data, 0, sizeof(*data));
 		data->isglobal = 0;
 	}
-	INIT_WORK(&data->worker, do_path_verification_work);
+	INIT_WORK(&data->worker, do_pe_handler_work);
 	dasd_get_device(device);
 	data->device = device;
 	data->tbvpm = lpm;
@@ -6725,7 +6735,7 @@ static struct dasd_discipline dasd_eckd_
 	.check_device = dasd_eckd_check_characteristics,
 	.uncheck_device = dasd_eckd_uncheck_device,
 	.do_analysis = dasd_eckd_do_analysis,
-	.verify_path = dasd_eckd_verify_path,
+	.pe_handler = dasd_eckd_pe_handler,
 	.basic_to_ready = dasd_eckd_basic_to_ready,
 	.online_to_ready = dasd_eckd_online_to_ready,
 	.basic_to_known = dasd_eckd_basic_to_known,
@@ -6786,16 +6796,16 @@ dasd_eckd_init(void)
 				    GFP_KERNEL | GFP_DMA);
 	if (!dasd_vol_info_req)
 		return -ENOMEM;
-	path_verification_worker = kmalloc(sizeof(*path_verification_worker),
-				   GFP_KERNEL | GFP_DMA);
-	if (!path_verification_worker) {
+	pe_handler_worker = kmalloc(sizeof(*pe_handler_worker),
+				    GFP_KERNEL | GFP_DMA);
+	if (!pe_handler_worker) {
 		kfree(dasd_reserve_req);
 		kfree(dasd_vol_info_req);
 		return -ENOMEM;
 	}
 	rawpadpage = (void *)__get_free_page(GFP_KERNEL);
 	if (!rawpadpage) {
-		kfree(path_verification_worker);
+		kfree(pe_handler_worker);
 		kfree(dasd_reserve_req);
 		kfree(dasd_vol_info_req);
 		return -ENOMEM;
@@ -6804,7 +6814,7 @@ dasd_eckd_init(void)
 	if (!ret)
 		wait_for_device_probe();
 	else {
-		kfree(path_verification_worker);
+		kfree(pe_handler_worker);
 		kfree(dasd_reserve_req);
 		kfree(dasd_vol_info_req);
 		free_page((unsigned long)rawpadpage);
@@ -6816,7 +6826,7 @@ static void __exit
 dasd_eckd_cleanup(void)
 {
 	ccw_driver_unregister(&dasd_eckd_driver);
-	kfree(path_verification_worker);
+	kfree(pe_handler_worker);
 	kfree(dasd_reserve_req);
 	free_page((unsigned long)rawpadpage);
 }
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -298,6 +298,7 @@ struct dasd_discipline {
 	 * configuration.
 	 */
 	int (*verify_path)(struct dasd_device *, __u8);
+	int (*pe_handler)(struct dasd_device *, __u8);
 
 	/*
 	 * Last things to do when a device is set online, and first things