Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 update from Martin Schwidefsky:
 "The most prominent change in this patch set is the software dirty bit
  patch for s390.  It removes __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY and
  the page_test_and_clear_dirty primitive which makes the common memory
  management code a bit less obscure.

  Heiko fixed most of the PCI related fallout, more often than not
  missing GENERIC_HARDIRQS dependencies.  Notable is one of the 3270
  patches which adds an export to tty_io to be able to resize a tty.

  The rest is the usual bunch of cleanups and bug fixes."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (42 commits)
  s390/module: Add missing R_390_NONE relocation type
  drivers/gpio: add missing GENERIC_HARDIRQ dependency
  drivers/input: add couple of missing GENERIC_HARDIRQS dependencies
  s390/cleanup: rename SPP to LPP
  s390/mm: implement software dirty bits
  s390/mm: Fix crst upgrade of mmap with MAP_FIXED
  s390/linker skript: discard exit.data at runtime
  drivers/media: add missing GENERIC_HARDIRQS dependency
  s390/bpf,jit: add vlan tag support
  drivers/net,AT91RM9200: add missing GENERIC_HARDIRQS dependency
  iucv: fix kernel panic at reboot
  s390/Kconfig: sort list of arch selected config options
  phylib: remove !S390 dependeny from Kconfig
  uio: remove !S390 dependency from Kconfig
  dasd: fix sysfs cleanup in dasd_generic_remove
  s390/pci: fix hotplug module init
  s390/pci: cleanup clp page allocation
  s390/pci: cleanup clp inline assembly
  s390/perf: cpum_cf: fallback to software sampling events
  s390/mm: provide PAGE_SHARED define
  ...

1 files changed, 105 insertions, 18 deletions

diff --git a/drivers/s390/cio/device_pgid.c b/drivers/s390/cio/device_pgid.c
index 908d287f66c1..37ada05e82a5 100644
--- a/drivers/s390/cio/device_pgid.c
+++ b/drivers/s390/cio/device_pgid.c
@@ -23,6 +23,8 @@
 #define PGID_RETRIES	256
 #define PGID_TIMEOUT	(10 * HZ)
 
+static void verify_start(struct ccw_device *cdev);
+
 /*
  * Process path verification data and report result.
  */
@@ -70,8 +72,8 @@ static void nop_do(struct ccw_device *cdev)
 	struct subchannel *sch = to_subchannel(cdev->dev.parent);
 	struct ccw_request *req = &cdev->private->req;
 
-	/* Adjust lpm. */
-	req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam & sch->opm);
+	req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam & sch->opm &
+			      ~cdev->private->path_noirq_mask);
 	if (!req->lpm)
 		goto out_nopath;
 	nop_build_cp(cdev);
@@ -102,10 +104,20 @@ static void nop_callback(struct ccw_device *cdev, void *data, int rc)
 	struct subchannel *sch = to_subchannel(cdev->dev.parent);
 	struct ccw_request *req = &cdev->private->req;
 
-	if (rc == 0)
+	switch (rc) {
+	case 0:
 		sch->vpm |= req->lpm;
-	else if (rc != -EACCES)
+		break;
+	case -ETIME:
+		cdev->private->path_noirq_mask |= req->lpm;
+		break;
+	case -EACCES:
+		cdev->private->path_notoper_mask |= req->lpm;
+		break;
+	default:
 		goto err;
+	}
+	/* Continue on the next path. */
 	req->lpm >>= 1;
 	nop_do(cdev);
 	return;
@@ -132,6 +144,48 @@ static void spid_build_cp(struct ccw_device *cdev, u8 fn)
 	req->cp		= cp;
 }
 
+static void pgid_wipeout_callback(struct ccw_device *cdev, void *data, int rc)
+{
+	if (rc) {
+		/* We don't know the path groups' state. Abort. */
+		verify_done(cdev, rc);
+		return;
+	}
+	/*
+	 * Path groups have been reset. Restart path verification but
+	 * leave paths in path_noirq_mask out.
+	 */
+	cdev->private->flags.pgid_unknown = 0;
+	verify_start(cdev);
+}
+
+/*
+ * Reset pathgroups and restart path verification, leave unusable paths out.
+ */
+static void pgid_wipeout_start(struct ccw_device *cdev)
+{
+	struct subchannel *sch = to_subchannel(cdev->dev.parent);
+	struct ccw_dev_id *id = &cdev->private->dev_id;
+	struct ccw_request *req = &cdev->private->req;
+	u8 fn;
+
+	CIO_MSG_EVENT(2, "wipe: device 0.%x.%04x: pvm=%02x nim=%02x\n",
+		      id->ssid, id->devno, cdev->private->pgid_valid_mask,
+		      cdev->private->path_noirq_mask);
+
+	/* Initialize request data. */
+	memset(req, 0, sizeof(*req));
+	req->timeout	= PGID_TIMEOUT;
+	req->maxretries	= PGID_RETRIES;
+	req->lpm	= sch->schib.pmcw.pam;
+	req->callback	= pgid_wipeout_callback;
+	fn = SPID_FUNC_DISBAND;
+	if (cdev->private->flags.mpath)
+		fn |= SPID_FUNC_MULTI_PATH;
+	spid_build_cp(cdev, fn);
+	ccw_request_start(cdev);
+}
+
 /*
  * Perform establish/resign SET PGID on a single path.
  */
@@ -157,11 +211,14 @@ static void spid_do(struct ccw_device *cdev)
 	return;
 
 out_nopath:
+	if (cdev->private->flags.pgid_unknown) {
+		/* At least one SPID could be partially done. */
+		pgid_wipeout_start(cdev);
+		return;
+	}
 	verify_done(cdev, sch->vpm ? 0 : -EACCES);
 }
 
-static void verify_start(struct ccw_device *cdev);
-
 /*
  * Process SET PGID request result for a single path.
  */
@@ -174,7 +231,12 @@ static void spid_callback(struct ccw_device *cdev, void *data, int rc)
 	case 0:
 		sch->vpm |= req->lpm & sch->opm;
 		break;
+	case -ETIME:
+		cdev->private->flags.pgid_unknown = 1;
+		cdev->private->path_noirq_mask |= req->lpm;
+		break;
 	case -EACCES:
+		cdev->private->path_notoper_mask |= req->lpm;
 		break;
 	case -EOPNOTSUPP:
 		if (cdev->private->flags.mpath) {
@@ -330,8 +392,9 @@ static void snid_done(struct ccw_device *cdev, int rc)
 	else {
 		donepm = pgid_to_donepm(cdev);
 		sch->vpm = donepm & sch->opm;
-		cdev->private->pgid_todo_mask &= ~donepm;
 		cdev->private->pgid_reset_mask |= reset;
+		cdev->private->pgid_todo_mask &=
+			~(donepm | cdev->private->path_noirq_mask);
 		pgid_fill(cdev, pgid);
 	}
 out:
@@ -341,6 +404,10 @@ out:
 		      cdev->private->pgid_todo_mask, mismatch, reserved, reset);
 	switch (rc) {
 	case 0:
+		if (cdev->private->flags.pgid_unknown) {
+			pgid_wipeout_start(cdev);
+			return;
+		}
 		/* Anything left to do? */
 		if (cdev->private->pgid_todo_mask == 0) {
 			verify_done(cdev, sch->vpm == 0 ? -EACCES : 0);
@@ -384,9 +451,10 @@ static void snid_do(struct ccw_device *cdev)
 {
 	struct subchannel *sch = to_subchannel(cdev->dev.parent);
 	struct ccw_request *req = &cdev->private->req;
+	int ret;
 
-	/* Adjust lpm if paths are not set in pam. */
-	req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam);
+	req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam &
+			      ~cdev->private->path_noirq_mask);
 	if (!req->lpm)
 		goto out_nopath;
 	snid_build_cp(cdev);
@@ -394,7 +462,13 @@ static void snid_do(struct ccw_device *cdev)
 	return;
 
 out_nopath:
-	snid_done(cdev, cdev->private->pgid_valid_mask ? 0 : -EACCES);
+	if (cdev->private->pgid_valid_mask)
+		ret = 0;
+	else if (cdev->private->path_noirq_mask)
+		ret = -ETIME;
+	else
+		ret = -EACCES;
+	snid_done(cdev, ret);
 }
 
 /*
@@ -404,10 +478,21 @@ static void snid_callback(struct ccw_device *cdev, void *data, int rc)
 {
 	struct ccw_request *req = &cdev->private->req;
 
-	if (rc == 0)
+	switch (rc) {
+	case 0:
 		cdev->private->pgid_valid_mask |= req->lpm;
-	else if (rc != -EACCES)
+		break;
+	case -ETIME:
+		cdev->private->flags.pgid_unknown = 1;
+		cdev->private->path_noirq_mask |= req->lpm;
+		break;
+	case -EACCES:
+		cdev->private->path_notoper_mask |= req->lpm;
+		break;
+	default:
 		goto err;
+	}
+	/* Continue on the next path. */
 	req->lpm >>= 1;
 	snid_do(cdev);
 	return;
@@ -427,6 +512,13 @@ static void verify_start(struct ccw_device *cdev)
 
 	sch->vpm = 0;
 	sch->lpm = sch->schib.pmcw.pam;
+
+	/* Initialize PGID data. */
+	memset(cdev->private->pgid, 0, sizeof(cdev->private->pgid));
+	cdev->private->pgid_valid_mask = 0;
+	cdev->private->pgid_todo_mask = sch->schib.pmcw.pam;
+	cdev->private->path_notoper_mask = 0;
+
 	/* Initialize request data. */
 	memset(req, 0, sizeof(*req));
 	req->timeout	= PGID_TIMEOUT;
@@ -459,14 +551,8 @@ static void verify_start(struct ccw_device *cdev)
  */
 void ccw_device_verify_start(struct ccw_device *cdev)
 {
-	struct subchannel *sch = to_subchannel(cdev->dev.parent);
-
 	CIO_TRACE_EVENT(4, "vrfy");
 	CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
-	/* Initialize PGID data. */
-	memset(cdev->private->pgid, 0, sizeof(cdev->private->pgid));
-	cdev->private->pgid_valid_mask = 0;
-	cdev->private->pgid_todo_mask = sch->schib.pmcw.pam;
 	/*
 	 * Initialize pathgroup and multipath state with target values.
 	 * They may change in the course of path verification.
@@ -474,6 +560,7 @@ void ccw_device_verify_start(struct ccw_device *cdev)
 	cdev->private->flags.pgroup = cdev->private->options.pgroup;
 	cdev->private->flags.mpath = cdev->private->options.mpath;
 	cdev->private->flags.doverify = 0;
+	cdev->private->path_noirq_mask = 0;
 	verify_start(cdev);
 }