vfio-ccw: Register a chp_event callback for vfio-ccw (b7701dfb) · Commits · 戴 / test

drivers/s390/cio/vfio_ccw_drv.c

+47 −0

Original line number	Diff line number	Diff line
		@@ -19,6 +19,7 @@

		#include <asm/isc.h>

		#include "chp.h"
		#include "ioasm.h"
		#include "css.h"
		#include "vfio_ccw_private.h"
		@@ -262,6 +263,51 @@ out_unlock:
		return rc;
		}

		static int vfio_ccw_chp_event(struct subchannel *sch,
		struct chp_link *link, int event)
		{
		struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev);
		int mask = chp_ssd_get_mask(&sch->ssd_info, link);
		int retry = 255;

		if (!private \|\| !mask)
		return 0;

		VFIO_CCW_MSG_EVENT(2, "%pUl (%x.%x.%04x): mask=0x%x event=%d\n",
		mdev_uuid(private->mdev), sch->schid.cssid,
		sch->schid.ssid, sch->schid.sch_no,
		mask, event);

		if (cio_update_schib(sch))
		return -ENODEV;

		switch (event) {
		case CHP_VARY_OFF:
		/* Path logically turned off */
		sch->opm &= ~mask;
		sch->lpm &= ~mask;
		if (sch->schib.pmcw.lpum & mask)
		cio_cancel_halt_clear(sch, &retry);
		break;
		case CHP_OFFLINE:
		/* Path is gone */
		if (sch->schib.pmcw.lpum & mask)
		cio_cancel_halt_clear(sch, &retry);
		break;
		case CHP_VARY_ON:
		/* Path logically turned on */
		sch->opm \|= mask;
		sch->lpm \|= mask;
		break;
		case CHP_ONLINE:
		/* Path became available */
		sch->lpm \|= mask & sch->opm;
		break;
		}

		return 0;
		}

		static struct css_device_id vfio_ccw_sch_ids[] = {
		{ .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, },
		{ /* end of list */ },
		@@ -279,6 +325,7 @@ static struct css_driver vfio_ccw_sch_driver = {
		.remove = vfio_ccw_sch_remove,
		.shutdown = vfio_ccw_sch_shutdown,
		.sch_event = vfio_ccw_sch_event,
		.chp_event = vfio_ccw_chp_event,
		};

		static int __init vfio_ccw_debug_init(void)