Commit 32ef9388 authored by Vineeth Vijayan's avatar Vineeth Vijayan Committed by Jens Axboe
Browse files

s390/cio: Add support for FCES status notification 



Fibre Channel Endpoint-Security event is received as an sei:nt0 type
in the CIO layer. This information needs to be shared with the
CCW device drivers using the path_events callback.

Co-developed-by: default avatarSebastian Ott <sebott@linux.ibm.com>
Signed-off-by: default avatarVineeth Vijayan <vneethv@linux.ibm.com>
Signed-off-by: default avatarSebastian Ott <sebott@linux.ibm.com>
Signed-off-by: default avatarStefan Haberland <sth@linux.ibm.com>
Reviewed-by: default avatarPeter Oberparleiter <oberpar@linux.ibm.com>
Acked-by: default avatarVasily Gorbik <gor@linux.ibm.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 4cd6094d

arch/s390/include/asm/ccwdev.h

+2 −0
Original line number Diff line number Diff line
@@ -104,6 +104,8 @@ struct ccw_device { 
					       was successfully verified. */

#define PE_PATHGROUP_ESTABLISHED	0x4 /* A pathgroup was reset and had

					       to be established again. */

#define PE_PATH_FCES_EVENT		0x8 /* The FCES Status of a path has

					     * changed. */



/*

 * Possible CIO actions triggered by the unit check handler.

drivers/s390/cio/chp.h

+1 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#define CHP_OFFLINE 1

#define CHP_VARY_ON 2

#define CHP_VARY_OFF 3

#define CHP_FCES_EVENT 4



struct chp_link {

	struct chp_id chpid;

drivers/s390/cio/chsc.c

+53 −9
Original line number Diff line number Diff line
@@ -37,6 +37,9 @@ static void *sei_page; 
static void *chsc_page;

static DEFINE_SPINLOCK(chsc_page_lock);



#define SEI_VF_FLA	0xc0 /* VF flag for Full Link Address */

#define SEI_RS_CHPID	0x4  /* 4 in RS field indicates CHPID */



/**

 * chsc_error_from_response() - convert a chsc response to an error

 * @response: chsc response code
@@ -287,6 +290,15 @@ static void s390_process_res_acc(struct chp_link *link) 
	css_schedule_reprobe();

}



static int process_fces_event(struct subchannel *sch, void *data)

{

	spin_lock_irq(sch->lock);

	if (sch->driver && sch->driver->chp_event)

		sch->driver->chp_event(sch, data, CHP_FCES_EVENT);

	spin_unlock_irq(sch->lock);

	return 0;

}



struct chsc_sei_nt0_area {

	u8  flags;

	u8  vf;				/* validity flags */
@@ -364,6 +376,16 @@ static char *store_ebcdic(char *dest, const char *src, unsigned long len, 
	return dest + len;

}



static void chsc_link_from_sei(struct chp_link *link,

				struct chsc_sei_nt0_area *sei_area)

{

	if ((sei_area->vf & SEI_VF_FLA) != 0) {

		link->fla	= sei_area->fla;

		link->fla_mask	= ((sei_area->vf & SEI_VF_FLA) == SEI_VF_FLA) ?

							0xffff : 0xff00;

	}

}



/* Format node ID and parameters for output in LIR log message. */

static void format_node_data(char *params, char *id, struct node_descriptor *nd)

{
@@ -453,15 +475,7 @@ static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area) 
	}

	memset(&link, 0, sizeof(struct chp_link));

	link.chpid = chpid;

	if ((sei_area->vf & 0xc0) != 0) {

		link.fla = sei_area->fla;

		if ((sei_area->vf & 0xc0) == 0xc0)

			/* full link address */

			link.fla_mask = 0xffff;

		else

			/* link address */

			link.fla_mask = 0xff00;

	}

	chsc_link_from_sei(&link, sei_area);

	s390_process_res_acc(&link);

}
@@ -570,6 +584,33 @@ static void chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area *sei_area) 
	ap_bus_cfg_chg();

}



static void chsc_process_sei_fces_event(struct chsc_sei_nt0_area *sei_area)

{

	struct chp_link link;

	struct chp_id chpid;

	struct channel_path *chp;



	CIO_CRW_EVENT(4,

	"chsc: FCES status notification (rs=%02x, rs_id=%04x, FCES-status=%x)\n",

		sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);



	if (sei_area->rs != SEI_RS_CHPID)

		return;

	chp_id_init(&chpid);

	chpid.id = sei_area->rsid;



	/* Ignore the event on unknown/invalid chp */

	chp = chpid_to_chp(chpid);

	if (!chp)

		return;



	memset(&link, 0, sizeof(struct chp_link));

	link.chpid = chpid;

	chsc_link_from_sei(&link, sei_area);



	for_each_subchannel_staged(process_fces_event, NULL, &link);

}



static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)

{

	switch (sei_area->cc) {
@@ -611,6 +652,9 @@ static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area) 
	case 14: /* scm available notification */

		chsc_process_sei_scm_avail(sei_area);

		break;

	case 15: /* FCES event notification */

		chsc_process_sei_fces_event(sei_area);

		break;

	default: /* other stuff */

		CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",

			      sei_area->cc);

drivers/s390/cio/device.c

+14 −1
Original line number Diff line number Diff line
@@ -1170,7 +1170,8 @@ static int io_subchannel_chp_event(struct subchannel *sch, 
				   struct chp_link *link, int event)

{

	struct ccw_device *cdev = sch_get_cdev(sch);

	int mask;

	int mask, chpid, valid_bit;

	int path_event[8];



	mask = chp_ssd_get_mask(&sch->ssd_info, link);

	if (!mask)
@@ -1205,6 +1206,18 @@ static int io_subchannel_chp_event(struct subchannel *sch, 
			cdev->private->path_new_mask |= mask;

		io_subchannel_verify(sch);

		break;

	case CHP_FCES_EVENT:

		/* Forward Endpoint Security event */

		for (chpid = 0, valid_bit = 0x80; chpid < 8; chpid++,

				valid_bit >>= 1) {

			if (mask & valid_bit)

				path_event[chpid] = PE_PATH_FCES_EVENT;

			else

				path_event[chpid] = PE_NONE;

		}

		if (cdev)

			cdev->drv->path_event(cdev, path_event);

		break;

	}

	return 0;

}