Commit 0d9c038f authored by Tony Krowiak's avatar Tony Krowiak Committed by Martin Schwidefsky
Browse files

zcrypt: handle AP Info notification from CHSC SEI command 



The current AP bus implementation periodically polls the AP configuration
to detect changes. When the AP configuration is dynamically changed via the
SE or an SCLP instruction, the changes will not be reflected to sysfs until
the next time the AP configuration is polled. The CHSC architecture
provides a Store Event Information (SEI) command to make notification of an
AP configuration change. This patch introduces a handler to process
notification from the CHSC SEI command by immediately kicking off an AP bus
scan-after-event.

Signed-off-by: default avatarTony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: default avatarHalil Pasic <pasic@linux.ibm.com>
Reviewed-by: default avatarSebastian Ott <sebott@linux.ibm.com>
Reviewed-by: default avatarHarald Freudenberger <FREUDE@de.ibm.com>
Reviewed-by: default avatarCornelia Huck <cohuck@redhat.com>
Signed-off-by: default avatarSebastian Ott <sebott@linux.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 0ba8141f

arch/s390/include/asm/ap.h

+11 −0
Original line number Diff line number Diff line
@@ -360,4 +360,15 @@ static inline struct ap_queue_status ap_dqap(ap_qid_t qid, 
	return reg1;

}



/*

 * Interface to tell the AP bus code that a configuration

 * change has happened. The bus code should at least do

 * an ap bus resource rescan.

 */

#if IS_ENABLED(CONFIG_ZCRYPT)

void ap_bus_cfg_chg(void);

#else

static inline void ap_bus_cfg_chg(void){};

#endif



#endif /* _ASM_S390_AP_H_ */

drivers/s390/cio/chsc.c

+13 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <asm/crw.h>

#include <asm/isc.h>

#include <asm/ebcdic.h>

#include <asm/ap.h>



#include "css.h"

#include "cio.h"
@@ -586,6 +587,15 @@ static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area) 
			      " failed (rc=%d).\n", ret);

}



static void chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area *sei_area)

{

	CIO_CRW_EVENT(3, "chsc: ap config changed\n");

	if (sei_area->rs != 5)

		return;



	ap_bus_cfg_chg();

}



static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)

{

	switch (sei_area->cc) {
@@ -612,6 +622,9 @@ static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area) 
	case 2: /* i/o resource accessibility */

		chsc_process_sei_res_acc(sei_area);

		break;

	case 3: /* ap config changed */

		chsc_process_sei_ap_cfg_chg(sei_area);

		break;

	case 7: /* channel-path-availability information */

		chsc_process_sei_chp_avail(sei_area);

		break;

drivers/s390/crypto/ap_bus.c

+10 −0
Original line number Diff line number Diff line
@@ -867,6 +867,16 @@ void ap_bus_force_rescan(void) 
}

EXPORT_SYMBOL(ap_bus_force_rescan);



/*

* A config change has happened, force an ap bus rescan.

*/

void ap_bus_cfg_chg(void)

{

	AP_DBF(DBF_INFO, "%s config change, forcing bus rescan\n", __func__);



	ap_bus_force_rescan();

}



/*

 * hex2bitmap() - parse hex mask string and set bitmap.

 * Valid strings are "0x012345678" with at least one valid hex number.

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