Commit 0677519a authored by Harald Freudenberger's avatar Harald Freudenberger Committed by Vasily Gorbik
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s390/ap: extend AP change bindings-complete uevent with counter 



Userspace udev rules need an indication about the very first AP change
BINDINGS=complete uevent.

So now this uevent is extend with an additional key-value entry
COMPLETECOUNT=<counter>. The very first uevent will show counter=1 and
the following BINDINGS=complete uevents increase this counter by 1.

Here is an example how the very first BINDINGS=complete uevent
looks like:

  KERNEL[106.079510] change   /devices/ap (ap)
  ACTION=change
  DEVPATH=/devices/ap
  SUBSYSTEM=ap
  BINDINGS=complete
  COMPLETECOUNT=1
  SEQNUM=10686

Signed-off-by: default avatarHarald Freudenberger <freude@linux.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent d2e834c6

drivers/s390/crypto/ap_bus.c

+8 −2
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0+

/*

 * Copyright IBM Corp. 2006, 2020

 * Copyright IBM Corp. 2006, 2021

 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>

 *	      Martin Schwidefsky <schwidefsky@de.ibm.com>

 *	      Ralph Wuerthner <rwuerthn@de.ibm.com>
@@ -77,6 +77,9 @@ EXPORT_SYMBOL(ap_perms_mutex); 
/* # of bus scans since init */

static atomic64_t ap_scan_bus_count;



/* # of bindings complete since init */

static atomic64_t ap_bindings_complete_count = ATOMIC64_INIT(0);



/* completion for initial APQN bindings complete */

static DECLARE_COMPLETION(ap_init_apqn_bindings_complete);
@@ -613,8 +616,11 @@ static void ap_send_init_scan_done_uevent(void) 


static void ap_send_bindings_complete_uevent(void)

{

	char *envp[] = { "BINDINGS=complete", NULL };

	char buf[32];

	char *envp[] = { "BINDINGS=complete", buf, NULL };



	snprintf(buf, sizeof(buf), "COMPLETECOUNT=%llu",

		 atomic64_inc_return(&ap_bindings_complete_count));

	kobject_uevent_env(&ap_root_device->kobj, KOBJ_CHANGE, envp);

}