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linux/drivers/s390/cio/device_status.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license 
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

400 lines
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Raw Blame History

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright IBM Corp. 2002
* Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
* Martin Schwidefsky (schwidefsky@de.ibm.com)
*
* Status accumulation and basic sense functions.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <asm/ccwdev.h>
#include <asm/cio.h>
#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "device.h"
#include "ioasm.h"
#include "io_sch.h"
/*
* Check for any kind of channel or interface control check but don't
* issue the message for the console device
*/
static void
ccw_device_msg_control_check(struct ccw_device *cdev, struct irb *irb)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
char dbf_text[15];
if (!scsw_is_valid_cstat(&irb->scsw) ||
!(scsw_cstat(&irb->scsw) & (SCHN_STAT_CHN_DATA_CHK |
SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK)))
return;
CIO_MSG_EVENT(0, "Channel-Check or Interface-Control-Check "
"received"
" ... device %04x on subchannel 0.%x.%04x, dev_stat "
": %02X sch_stat : %02X\n",
cdev->private->dev_id.devno, sch->schid.ssid,
sch->schid.sch_no,
scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw));
sprintf(dbf_text, "chk%x", sch->schid.sch_no);
CIO_TRACE_EVENT(0, dbf_text);
CIO_HEX_EVENT(0, irb, sizeof(struct irb));
}
/*
* Some paths became not operational (pno bit in scsw is set).
*/
static void
ccw_device_path_notoper(struct ccw_device *cdev)
{
struct subchannel *sch;
sch = to_subchannel(cdev->dev.parent);
if (cio_update_schib(sch))
goto doverify;
CIO_MSG_EVENT(0, "%s(0.%x.%04x) - path(s) %02x are "
"not operational \n", __func__,
sch->schid.ssid, sch->schid.sch_no,
sch->schib.pmcw.pnom);
sch->lpm &= ~sch->schib.pmcw.pnom;
doverify:
cdev->private->flags.doverify = 1;
}
/*
* Copy valid bits from the extended control word to device irb.
*/
static void
ccw_device_accumulate_ecw(struct ccw_device *cdev, struct irb *irb)
{
/*
* Copy extended control bit if it is valid... yes there
* are condition that have to be met for the extended control
* bit to have meaning. Sick.
*/
cdev->private->irb.scsw.cmd.ectl = 0;
if ((irb->scsw.cmd.stctl & SCSW_STCTL_ALERT_STATUS) &&
!(irb->scsw.cmd.stctl & SCSW_STCTL_INTER_STATUS))
cdev->private->irb.scsw.cmd.ectl = irb->scsw.cmd.ectl;
/* Check if extended control word is valid. */
if (!cdev->private->irb.scsw.cmd.ectl)
return;
/* Copy concurrent sense / model dependent information. */
memcpy (&cdev->private->irb.ecw, irb->ecw, sizeof (irb->ecw));
}
/*
* Check if extended status word is valid.
*/
static int
ccw_device_accumulate_esw_valid(struct irb *irb)
{
if (!irb->scsw.cmd.eswf &&
(irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND))
return 0;
if (irb->scsw.cmd.stctl ==
(SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND) &&
!(irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
return 0;
return 1;
}
/*
* Copy valid bits from the extended status word to device irb.
*/
static void
ccw_device_accumulate_esw(struct ccw_device *cdev, struct irb *irb)
{
struct irb *cdev_irb;
struct sublog *cdev_sublog, *sublog;
if (!ccw_device_accumulate_esw_valid(irb))
return;
cdev_irb = &cdev->private->irb;
/* Copy last path used mask. */
cdev_irb->esw.esw1.lpum = irb->esw.esw1.lpum;
/* Copy subchannel logout information if esw is of format 0. */
if (irb->scsw.cmd.eswf) {
cdev_sublog = &cdev_irb->esw.esw0.sublog;
sublog = &irb->esw.esw0.sublog;
/* Copy extended status flags. */
cdev_sublog->esf = sublog->esf;
/*
* Copy fields that have a meaning for channel data check
* channel control check and interface control check.
*/
if (irb->scsw.cmd.cstat & (SCHN_STAT_CHN_DATA_CHK |
SCHN_STAT_CHN_CTRL_CHK |
SCHN_STAT_INTF_CTRL_CHK)) {
/* Copy ancillary report bit. */
cdev_sublog->arep = sublog->arep;
/* Copy field-validity-flags. */
cdev_sublog->fvf = sublog->fvf;
/* Copy storage access code. */
cdev_sublog->sacc = sublog->sacc;
/* Copy termination code. */
cdev_sublog->termc = sublog->termc;
/* Copy sequence code. */
cdev_sublog->seqc = sublog->seqc;
}
/* Copy device status check. */
cdev_sublog->devsc = sublog->devsc;
/* Copy secondary error. */
cdev_sublog->serr = sublog->serr;
/* Copy i/o-error alert. */
cdev_sublog->ioerr = sublog->ioerr;
/* Copy channel path timeout bit. */
if (irb->scsw.cmd.cstat & SCHN_STAT_INTF_CTRL_CHK)
cdev_irb->esw.esw0.erw.cpt = irb->esw.esw0.erw.cpt;
/* Copy failing storage address validity flag. */
cdev_irb->esw.esw0.erw.fsavf = irb->esw.esw0.erw.fsavf;
if (cdev_irb->esw.esw0.erw.fsavf) {
/* ... and copy the failing storage address. */
memcpy(cdev_irb->esw.esw0.faddr, irb->esw.esw0.faddr,
sizeof (irb->esw.esw0.faddr));
/* ... and copy the failing storage address format. */
cdev_irb->esw.esw0.erw.fsaf = irb->esw.esw0.erw.fsaf;
}
/* Copy secondary ccw address validity bit. */
cdev_irb->esw.esw0.erw.scavf = irb->esw.esw0.erw.scavf;
if (irb->esw.esw0.erw.scavf)
/* ... and copy the secondary ccw address. */
cdev_irb->esw.esw0.saddr = irb->esw.esw0.saddr;
}
/* FIXME: DCTI for format 2? */
/* Copy authorization bit. */
cdev_irb->esw.esw0.erw.auth = irb->esw.esw0.erw.auth;
/* Copy path verification required flag. */
cdev_irb->esw.esw0.erw.pvrf = irb->esw.esw0.erw.pvrf;
if (irb->esw.esw0.erw.pvrf)
cdev->private->flags.doverify = 1;
/* Copy concurrent sense bit. */
cdev_irb->esw.esw0.erw.cons = irb->esw.esw0.erw.cons;
if (irb->esw.esw0.erw.cons)
cdev_irb->esw.esw0.erw.scnt = irb->esw.esw0.erw.scnt;
}
/*
* Accumulate status from irb to devstat.
*/
void
ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb)
{
struct irb *cdev_irb;
/*
* Check if the status pending bit is set in stctl.
* If not, the remaining bit have no meaning and we must ignore them.
* The esw is not meaningful as well...
*/
if (!(scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))
return;
/* Check for channel checks and interface control checks. */
ccw_device_msg_control_check(cdev, irb);
/* Check for path not operational. */
if (scsw_is_valid_pno(&irb->scsw) && scsw_pno(&irb->scsw))
ccw_device_path_notoper(cdev);
/* No irb accumulation for transport mode irbs. */
if (scsw_is_tm(&irb->scsw)) {
memcpy(&cdev->private->irb, irb, sizeof(struct irb));
return;
}
/*
* Don't accumulate unsolicited interrupts.
*/
if (!scsw_is_solicited(&irb->scsw))
return;
cdev_irb = &cdev->private->irb;
/*
* If the clear function had been performed, all formerly pending
* status at the subchannel has been cleared and we must not pass
* intermediate accumulated status to the device driver.
*/
if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
memset(&cdev->private->irb, 0, sizeof(struct irb));
/* Copy bits which are valid only for the start function. */
if (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) {
/* Copy key. */
cdev_irb->scsw.cmd.key = irb->scsw.cmd.key;
/* Copy suspend control bit. */
cdev_irb->scsw.cmd.sctl = irb->scsw.cmd.sctl;
/* Accumulate deferred condition code. */
cdev_irb->scsw.cmd.cc |= irb->scsw.cmd.cc;
/* Copy ccw format bit. */
cdev_irb->scsw.cmd.fmt = irb->scsw.cmd.fmt;
/* Copy prefetch bit. */
cdev_irb->scsw.cmd.pfch = irb->scsw.cmd.pfch;
/* Copy initial-status-interruption-control. */
cdev_irb->scsw.cmd.isic = irb->scsw.cmd.isic;
/* Copy address limit checking control. */
cdev_irb->scsw.cmd.alcc = irb->scsw.cmd.alcc;
/* Copy suppress suspend bit. */
cdev_irb->scsw.cmd.ssi = irb->scsw.cmd.ssi;
}
/* Take care of the extended control bit and extended control word. */
ccw_device_accumulate_ecw(cdev, irb);
/* Accumulate function control. */
cdev_irb->scsw.cmd.fctl |= irb->scsw.cmd.fctl;
/* Copy activity control. */
cdev_irb->scsw.cmd.actl = irb->scsw.cmd.actl;
/* Accumulate status control. */
cdev_irb->scsw.cmd.stctl |= irb->scsw.cmd.stctl;
/*
* Copy ccw address if it is valid. This is a bit simplified
* but should be close enough for all practical purposes.
*/
if ((irb->scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) ||
((irb->scsw.cmd.stctl ==
(SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND)) &&
(irb->scsw.cmd.actl & SCSW_ACTL_DEVACT) &&
(irb->scsw.cmd.actl & SCSW_ACTL_SCHACT)) ||
(irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
cdev_irb->scsw.cmd.cpa = irb->scsw.cmd.cpa;
/* Accumulate device status, but not the device busy flag. */
cdev_irb->scsw.cmd.dstat &= ~DEV_STAT_BUSY;
/* dstat is not always valid. */
if (irb->scsw.cmd.stctl &
(SCSW_STCTL_PRIM_STATUS | SCSW_STCTL_SEC_STATUS
| SCSW_STCTL_INTER_STATUS | SCSW_STCTL_ALERT_STATUS))
cdev_irb->scsw.cmd.dstat |= irb->scsw.cmd.dstat;
/* Accumulate subchannel status. */
cdev_irb->scsw.cmd.cstat |= irb->scsw.cmd.cstat;
/* Copy residual count if it is valid. */
if ((irb->scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) &&
(irb->scsw.cmd.cstat & ~(SCHN_STAT_PCI | SCHN_STAT_INCORR_LEN))
== 0)
cdev_irb->scsw.cmd.count = irb->scsw.cmd.count;
/* Take care of bits in the extended status word. */
ccw_device_accumulate_esw(cdev, irb);
/*
* Check whether we must issue a SENSE CCW ourselves if there is no
* concurrent sense facility installed for the subchannel.
* No sense is required if no delayed sense is pending
* and we did not get a unit check without sense information.
*
* Note: We should check for ioinfo[irq]->flags.consns but VM
* violates the ESA/390 architecture and doesn't present an
* operand exception for virtual devices without concurrent
* sense facility available/supported when enabling the
* concurrent sense facility.
*/
if ((cdev_irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
!(cdev_irb->esw.esw0.erw.cons))
cdev->private->flags.dosense = 1;
}
/*
* Do a basic sense.
*/
int
ccw_device_do_sense(struct ccw_device *cdev, struct irb *irb)
{
struct subchannel *sch;
struct ccw1 *sense_ccw;
int rc;
sch = to_subchannel(cdev->dev.parent);
/* A sense is required, can we do it now ? */
if (scsw_actl(&irb->scsw) & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT))
/*
* we received an Unit Check but we have no final
* status yet, therefore we must delay the SENSE
* processing. We must not report this intermediate
* status to the device interrupt handler.
*/
return -EBUSY;
/*
* We have ending status but no sense information. Do a basic sense.
*/
sense_ccw = &to_io_private(sch)->sense_ccw;
sense_ccw->cmd_code = CCW_CMD_BASIC_SENSE;
sense_ccw->cda = (__u32) __pa(cdev->private->irb.ecw);
sense_ccw->count = SENSE_MAX_COUNT;
sense_ccw->flags = CCW_FLAG_SLI;
rc = cio_start(sch, sense_ccw, 0xff);
if (rc == -ENODEV || rc == -EACCES)
dev_fsm_event(cdev, DEV_EVENT_VERIFY);
return rc;
}
/*
* Add information from basic sense to devstat.
*/
void
ccw_device_accumulate_basic_sense(struct ccw_device *cdev, struct irb *irb)
{
/*
* Check if the status pending bit is set in stctl.
* If not, the remaining bit have no meaning and we must ignore them.
* The esw is not meaningful as well...
*/
if (!(scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))
return;
/* Check for channel checks and interface control checks. */
ccw_device_msg_control_check(cdev, irb);
/* Check for path not operational. */
if (scsw_is_valid_pno(&irb->scsw) && scsw_pno(&irb->scsw))
ccw_device_path_notoper(cdev);
if (!(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
(irb->scsw.cmd.dstat & DEV_STAT_CHN_END)) {
cdev->private->irb.esw.esw0.erw.cons = 1;
cdev->private->flags.dosense = 0;
}
/* Check if path verification is required. */
if (ccw_device_accumulate_esw_valid(irb) &&
irb->esw.esw0.erw.pvrf)
cdev->private->flags.doverify = 1;
}
/*
* This function accumulates the status into the private devstat and
* starts a basic sense if one is needed.
*/
int
ccw_device_accumulate_and_sense(struct ccw_device *cdev, struct irb *irb)
{
ccw_device_accumulate_irb(cdev, irb);
if ((irb->scsw.cmd.actl & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0)
return -EBUSY;
/* Check for basic sense. */
if (cdev->private->flags.dosense &&
!(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)) {
cdev->private->irb.esw.esw0.erw.cons = 1;
cdev->private->flags.dosense = 0;
return 0;
}
if (cdev->private->flags.dosense) {
ccw_device_do_sense(cdev, irb);
return -EBUSY;
}
return 0;
}
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