[PATCH v2 10/10] s390/dasd: Process FCES path event notification

Stefan Haberland
2020-10-08T13:13:44Z

From: Jan Höppner <hoeppner@linux.ibm.com>

If the Fibre Channel Endpoint-Security status of a path changes, a
corresponding path event is received from the CIO layer.

Process this event by re-reading the FCES information.

As the information is retrieved for all paths on a single CU in one
call, the internal status can also be updated for all paths and no
processing per path is necessary.

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>
---
drivers/s390/block/dasd.c | 19 +++++++++++----
drivers/s390/block/dasd_eckd.c | 12 +++++++---
drivers/s390/block/dasd_int.h | 42 +++++++++++++++++++++++++++++++++-
3 files changed, 64 insertions(+), 9 deletions(-)

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 97c11d557052..7119a34fef5c 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -2107,20 +2107,25 @@ static void __dasd_device_start_head(struct dasd_device *device)

static void __dasd_device_check_path_events(struct dasd_device *device)
{
+ __u8 tbvpm, fcsecpm;
int rc;

- if (!dasd_path_get_tbvpm(device))
+ tbvpm = dasd_path_get_tbvpm(device);
+ fcsecpm = dasd_path_get_fcsecpm(device);
+
+ if (!tbvpm && !fcsecpm)
return;

if (device->stopped &
~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
return;
- rc = device->discipline->pe_handler(device,
- dasd_path_get_tbvpm(device));
- if (rc)
+ rc = device->discipline->pe_handler(device, tbvpm, fcsecpm);
+ if (rc) {
dasd_device_set_timer(device, 50);
- else
+ } else {
dasd_path_clear_all_verify(device);
+ dasd_path_clear_all_fcsec(device);
+ }
};

/*
@@ -3868,6 +3873,10 @@ void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
if (device->discipline->kick_validate)
device->discipline->kick_validate(device);
}
+ if (path_event[chp] & PE_PATH_FCES_EVENT) {
+ dasd_path_fcsec_update(device, chp);
+ dasd_schedule_device_bh(device);
+ }
}
hpfpm = dasd_path_get_hpfpm(device);
ifccpm = dasd_path_get_ifccpm(device);
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 2e1cfacbf4d8..0d319c21c287 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -111,6 +111,7 @@ struct pe_handler_work_data {
__u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
int isglobal;
__u8 tbvpm;
+ __u8 fcsecpm;
};
static struct pe_handler_work_data *pe_handler_worker;
static DEFINE_MUTEX(dasd_pe_handler_mutex);
@@ -1466,7 +1467,10 @@ static void do_pe_handler_work(struct work_struct *work)
return;
}

- dasd_eckd_path_available_action(device, data);
+ if (data->tbvpm)
+ dasd_eckd_path_available_action(device, data);
+ if (data->fcsecpm)
+ dasd_eckd_read_fc_security(device);

clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
dasd_put_device(device);
@@ -1476,7 +1480,8 @@ static void do_pe_handler_work(struct work_struct *work)
kfree(data);
}

-static int dasd_eckd_pe_handler(struct dasd_device *device, __u8 lpm)
+static int dasd_eckd_pe_handler(struct dasd_device *device,
+ __u8 tbvpm, __u8 fcsecpm)
{
struct pe_handler_work_data *data;

@@ -1495,7 +1500,8 @@ static int dasd_eckd_pe_handler(struct dasd_device *device, __u8 lpm)
INIT_WORK(&data->worker, do_pe_handler_work);
dasd_get_device(device);
data->device = device;
- data->tbvpm = lpm;
+ data->tbvpm = tbvpm;
+ data->fcsecpm = fcsecpm;
schedule_work(&data->worker);
return 0;
}
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index 3ae1c8d42b8a..8486ed3c877b 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -298,7 +298,7 @@ struct dasd_discipline {
* configuration.
*/
int (*verify_path)(struct dasd_device *, __u8);
- int (*pe_handler)(struct dasd_device *, __u8);
+ int (*pe_handler)(struct dasd_device *, __u8, __u8);

/*
* Last things to do when a device is set online, and first things
@@ -423,6 +423,7 @@ extern struct dasd_discipline *dasd_diag_discipline_pointer;
#define DASD_PATH_NOHPF 6
#define DASD_PATH_CUIR 7
#define DASD_PATH_IFCC 8
+#define DASD_PATH_FCSEC 9

#define DASD_THRHLD_MAX 4294967295U
#define DASD_INTERVAL_MAX 4294967295U
@@ -965,6 +966,29 @@ static inline void dasd_path_clear_all_verify(struct dasd_device *device)
dasd_path_clear_verify(device, chp);
}

+static inline void dasd_path_fcsec(struct dasd_device *device, int chp)
+{
+ __set_bit(DASD_PATH_FCSEC, &device->path[chp].flags);
+}
+
+static inline void dasd_path_clear_fcsec(struct dasd_device *device, int chp)
+{
+ __clear_bit(DASD_PATH_FCSEC, &device->path[chp].flags);
+}
+
+static inline int dasd_path_need_fcsec(struct dasd_device *device, int chp)
+{
+ return test_bit(DASD_PATH_FCSEC, &device->path[chp].flags);
+}
+
+static inline void dasd_path_clear_all_fcsec(struct dasd_device *device)
+{
+ int chp;
+
+ for (chp = 0; chp < 8; chp++)
+ dasd_path_clear_fcsec(device, chp);
+}
+
static inline void dasd_path_operational(struct dasd_device *device, int chp)
{
__set_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
@@ -1090,6 +1114,17 @@ static inline __u8 dasd_path_get_tbvpm(struct dasd_device *device)
return tbvpm;
}

+static inline int dasd_path_get_fcsecpm(struct dasd_device *device)
+{
+ int chp;
+
+ for (chp = 0; chp < 8; chp++)
+ if (dasd_path_need_fcsec(device, chp))
+ return 1;
+
+ return 0;
+}
+
static inline __u8 dasd_path_get_nppm(struct dasd_device *device)
{
int chp;
@@ -1347,6 +1382,11 @@ static inline void dasd_path_notoper(struct dasd_device *device, int chp)
dasd_path_clear_nonpreferred(device, chp);
}

+static inline void dasd_path_fcsec_update(struct dasd_device *device, int chp)
+{
+ dasd_path_fcsec(device, chp);
+}
+
/*
* remove all paths from normal operation
*/
--
2.17.1