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linux/drivers/s390/cio/device_pgid.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

725 lines
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// SPDX-License-Identifier: GPL-2.0
/*
* CCW device PGID and path verification I/O handling.
*
* Copyright IBM Corp. 2002, 2009
* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
*/
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/bitops.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <asm/ccwdev.h>
#include <asm/cio.h>
#include "cio.h"
#include "cio_debug.h"
#include "device.h"
#include "io_sch.h"
#define PGID_RETRIES 256
#define PGID_TIMEOUT (10 * HZ)
static void verify_start(struct ccw_device *cdev);
/*
* Process path verification data and report result.
*/
static void verify_done(struct ccw_device *cdev, int rc)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct ccw_dev_id *id = &cdev->private->dev_id;
int mpath = cdev->private->flags.mpath;
int pgroup = cdev->private->flags.pgroup;
if (rc)
goto out;
/* Ensure consistent multipathing state at device and channel. */
if (sch->config.mp != mpath) {
sch->config.mp = mpath;
rc = cio_commit_config(sch);
}
out:
CIO_MSG_EVENT(2, "vrfy: device 0.%x.%04x: rc=%d pgroup=%d mpath=%d "
"vpm=%02x\n", id->ssid, id->devno, rc, pgroup, mpath,
sch->vpm);
ccw_device_verify_done(cdev, rc);
}
/*
* Create channel program to perform a NOOP.
*/
static void nop_build_cp(struct ccw_device *cdev)
{
struct ccw_request *req = &cdev->private->req;
struct ccw1 *cp = cdev->private->iccws;
cp->cmd_code = CCW_CMD_NOOP;
cp->cda = 0;
cp->count = 0;
cp->flags = CCW_FLAG_SLI;
req->cp = cp;
}
/*
* Perform NOOP on a single path.
*/
static void nop_do(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct ccw_request *req = &cdev->private->req;
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);
ccw_request_start(cdev);
return;
out_nopath:
verify_done(cdev, sch->vpm ? 0 : -EACCES);
}
/*
* Adjust NOOP I/O status.
*/
static enum io_status nop_filter(struct ccw_device *cdev, void *data,
struct irb *irb, enum io_status status)
{
/* Only subchannel status might indicate a path error. */
if (status == IO_STATUS_ERROR && irb->scsw.cmd.cstat == 0)
return IO_DONE;
return status;
}
/*
* Process NOOP request result for a single path.
*/
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;
switch (rc) {
case 0:
sch->vpm |= req->lpm;
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;
err:
verify_done(cdev, rc);
}
/*
* Create channel program to perform SET PGID on a single path.
*/
static void spid_build_cp(struct ccw_device *cdev, u8 fn)
{
struct ccw_request *req = &cdev->private->req;
struct ccw1 *cp = cdev->private->iccws;
int i = pathmask_to_pos(req->lpm);
struct pgid *pgid = &cdev->private->pgid[i];
pgid->inf.fc = fn;
cp->cmd_code = CCW_CMD_SET_PGID;
cp->cda = (u32) (addr_t) pgid;
cp->count = sizeof(*pgid);
cp->flags = CCW_FLAG_SLI;
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.
*/
static void spid_do(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct ccw_request *req = &cdev->private->req;
u8 fn;
/* Use next available path that is not already in correct state. */
req->lpm = lpm_adjust(req->lpm, cdev->private->pgid_todo_mask);
if (!req->lpm)
goto out_nopath;
/* Channel program setup. */
if (req->lpm & sch->opm)
fn = SPID_FUNC_ESTABLISH;
else
fn = SPID_FUNC_RESIGN;
if (cdev->private->flags.mpath)
fn |= SPID_FUNC_MULTI_PATH;
spid_build_cp(cdev, fn);
ccw_request_start(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);
}
/*
* Process SET PGID request result for a single path.
*/
static void spid_callback(struct ccw_device *cdev, void *data, int rc)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct ccw_request *req = &cdev->private->req;
switch (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) {
/* Try without multipathing. */
cdev->private->flags.mpath = 0;
goto out_restart;
}
/* Try without pathgrouping. */
cdev->private->flags.pgroup = 0;
goto out_restart;
default:
goto err;
}
req->lpm >>= 1;
spid_do(cdev);
return;
out_restart:
verify_start(cdev);
return;
err:
verify_done(cdev, rc);
}
static void spid_start(struct ccw_device *cdev)
{
struct ccw_request *req = &cdev->private->req;
/* Initialize request data. */
memset(req, 0, sizeof(*req));
req->timeout = PGID_TIMEOUT;
req->maxretries = PGID_RETRIES;
req->lpm = 0x80;
req->singlepath = 1;
req->callback = spid_callback;
spid_do(cdev);
}
static int pgid_is_reset(struct pgid *p)
{
char *c;
for (c = (char *)p + 1; c < (char *)(p + 1); c++) {
if (*c != 0)
return 0;
}
return 1;
}
static int pgid_cmp(struct pgid *p1, struct pgid *p2)
{
return memcmp((char *) p1 + 1, (char *) p2 + 1,
sizeof(struct pgid) - 1);
}
/*
* Determine pathgroup state from PGID data.
*/
static void pgid_analyze(struct ccw_device *cdev, struct pgid **p,
int *mismatch, u8 *reserved, u8 *reset)
{
struct pgid *pgid = &cdev->private->pgid[0];
struct pgid *first = NULL;
int lpm;
int i;
*mismatch = 0;
*reserved = 0;
*reset = 0;
for (i = 0, lpm = 0x80; i < 8; i++, pgid++, lpm >>= 1) {
if ((cdev->private->pgid_valid_mask & lpm) == 0)
continue;
if (pgid->inf.ps.state2 == SNID_STATE2_RESVD_ELSE)
*reserved |= lpm;
if (pgid_is_reset(pgid)) {
*reset |= lpm;
continue;
}
if (!first) {
first = pgid;
continue;
}
if (pgid_cmp(pgid, first) != 0)
*mismatch = 1;
}
if (!first)
first = &channel_subsystems[0]->global_pgid;
*p = first;
}
static u8 pgid_to_donepm(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct pgid *pgid;
int i;
int lpm;
u8 donepm = 0;
/* Set bits for paths which are already in the target state. */
for (i = 0; i < 8; i++) {
lpm = 0x80 >> i;
if ((cdev->private->pgid_valid_mask & lpm) == 0)
continue;
pgid = &cdev->private->pgid[i];
if (sch->opm & lpm) {
if (pgid->inf.ps.state1 != SNID_STATE1_GROUPED)
continue;
} else {
if (pgid->inf.ps.state1 != SNID_STATE1_UNGROUPED)
continue;
}
if (cdev->private->flags.mpath) {
if (pgid->inf.ps.state3 != SNID_STATE3_MULTI_PATH)
continue;
} else {
if (pgid->inf.ps.state3 != SNID_STATE3_SINGLE_PATH)
continue;
}
donepm |= lpm;
}
return donepm;
}
static void pgid_fill(struct ccw_device *cdev, struct pgid *pgid)
{
int i;
for (i = 0; i < 8; i++)
memcpy(&cdev->private->pgid[i], pgid, sizeof(struct pgid));
}
/*
* Process SENSE PGID data and report result.
*/
static void snid_done(struct ccw_device *cdev, int rc)
{
struct ccw_dev_id *id = &cdev->private->dev_id;
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct pgid *pgid;
int mismatch = 0;
u8 reserved = 0;
u8 reset = 0;
u8 donepm;
if (rc)
goto out;
pgid_analyze(cdev, &pgid, &mismatch, &reserved, &reset);
if (reserved == cdev->private->pgid_valid_mask)
rc = -EUSERS;
else if (mismatch)
rc = -EOPNOTSUPP;
else {
donepm = pgid_to_donepm(cdev);
sch->vpm = donepm & sch->opm;
cdev->private->pgid_reset_mask |= reset;
cdev->private->pgid_todo_mask &=
~(donepm | cdev->private->path_noirq_mask);
pgid_fill(cdev, pgid);
}
out:
CIO_MSG_EVENT(2, "snid: device 0.%x.%04x: rc=%d pvm=%02x vpm=%02x "
"todo=%02x mism=%d rsvd=%02x reset=%02x\n", id->ssid,
id->devno, rc, cdev->private->pgid_valid_mask, sch->vpm,
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);
return;
}
/* Perform path-grouping. */
spid_start(cdev);
break;
case -EOPNOTSUPP:
/* Path-grouping not supported. */
cdev->private->flags.pgroup = 0;
cdev->private->flags.mpath = 0;
verify_start(cdev);
break;
default:
verify_done(cdev, rc);
}
}
/*
* Create channel program to perform a SENSE PGID on a single path.
*/
static void snid_build_cp(struct ccw_device *cdev)
{
struct ccw_request *req = &cdev->private->req;
struct ccw1 *cp = cdev->private->iccws;
int i = pathmask_to_pos(req->lpm);
/* Channel program setup. */
cp->cmd_code = CCW_CMD_SENSE_PGID;
cp->cda = (u32) (addr_t) &cdev->private->pgid[i];
cp->count = sizeof(struct pgid);
cp->flags = CCW_FLAG_SLI;
req->cp = cp;
}
/*
* Perform SENSE PGID on a single path.
*/
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;
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);
ccw_request_start(cdev);
return;
out_nopath:
if (cdev->private->pgid_valid_mask)
ret = 0;
else if (cdev->private->path_noirq_mask)
ret = -ETIME;
else
ret = -EACCES;
snid_done(cdev, ret);
}
/*
* Process SENSE PGID request result for single path.
*/
static void snid_callback(struct ccw_device *cdev, void *data, int rc)
{
struct ccw_request *req = &cdev->private->req;
switch (rc) {
case 0:
cdev->private->pgid_valid_mask |= req->lpm;
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;
err:
snid_done(cdev, rc);
}
/*
* Perform path verification.
*/
static void verify_start(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct ccw_request *req = &cdev->private->req;
struct ccw_dev_id *devid = &cdev->private->dev_id;
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;
req->maxretries = PGID_RETRIES;
req->lpm = 0x80;
req->singlepath = 1;
if (cdev->private->flags.pgroup) {
CIO_TRACE_EVENT(4, "snid");
CIO_HEX_EVENT(4, devid, sizeof(*devid));
req->callback = snid_callback;
snid_do(cdev);
} else {
CIO_TRACE_EVENT(4, "nop");
CIO_HEX_EVENT(4, devid, sizeof(*devid));
req->filter = nop_filter;
req->callback = nop_callback;
nop_do(cdev);
}
}
/**
* ccw_device_verify_start - perform path verification
* @cdev: ccw device
*
* Perform an I/O on each available channel path to @cdev to determine which
* paths are operational. The resulting path mask is stored in sch->vpm.
* If device options specify pathgrouping, establish a pathgroup for the
* operational paths. When finished, call ccw_device_verify_done with a
* return code specifying the result.
*/
void ccw_device_verify_start(struct ccw_device *cdev)
{
CIO_TRACE_EVENT(4, "vrfy");
CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
/*
* Initialize pathgroup and multipath state with target values.
* They may change in the course of path verification.
*/
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);
}
/*
* Process disband SET PGID request result.
*/
static void disband_callback(struct ccw_device *cdev, void *data, int rc)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct ccw_dev_id *id = &cdev->private->dev_id;
if (rc)
goto out;
/* Ensure consistent multipathing state at device and channel. */
cdev->private->flags.mpath = 0;
if (sch->config.mp) {
sch->config.mp = 0;
rc = cio_commit_config(sch);
}
out:
CIO_MSG_EVENT(0, "disb: device 0.%x.%04x: rc=%d\n", id->ssid, id->devno,
rc);
ccw_device_disband_done(cdev, rc);
}
/**
* ccw_device_disband_start - disband pathgroup
* @cdev: ccw device
*
* Execute a SET PGID channel program on @cdev to disband a previously
* established pathgroup. When finished, call ccw_device_disband_done with
* a return code specifying the result.
*/
void ccw_device_disband_start(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct ccw_request *req = &cdev->private->req;
u8 fn;
CIO_TRACE_EVENT(4, "disb");
CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
/* Request setup. */
memset(req, 0, sizeof(*req));
req->timeout = PGID_TIMEOUT;
req->maxretries = PGID_RETRIES;
req->lpm = sch->schib.pmcw.pam & sch->opm;
req->singlepath = 1;
req->callback = disband_callback;
fn = SPID_FUNC_DISBAND;
if (cdev->private->flags.mpath)
fn |= SPID_FUNC_MULTI_PATH;
spid_build_cp(cdev, fn);
ccw_request_start(cdev);
}
struct stlck_data {
struct completion done;
int rc;
};
static void stlck_build_cp(struct ccw_device *cdev, void *buf1, void *buf2)
{
struct ccw_request *req = &cdev->private->req;
struct ccw1 *cp = cdev->private->iccws;
cp[0].cmd_code = CCW_CMD_STLCK;
cp[0].cda = (u32) (addr_t) buf1;
cp[0].count = 32;
cp[0].flags = CCW_FLAG_CC;
cp[1].cmd_code = CCW_CMD_RELEASE;
cp[1].cda = (u32) (addr_t) buf2;
cp[1].count = 32;
cp[1].flags = 0;
req->cp = cp;
}
static void stlck_callback(struct ccw_device *cdev, void *data, int rc)
{
struct stlck_data *sdata = data;
sdata->rc = rc;
complete(&sdata->done);
}
/**
* ccw_device_stlck_start - perform unconditional release
* @cdev: ccw device
* @data: data pointer to be passed to ccw_device_stlck_done
* @buf1: data pointer used in channel program
* @buf2: data pointer used in channel program
*
* Execute a channel program on @cdev to release an existing PGID reservation.
*/
static void ccw_device_stlck_start(struct ccw_device *cdev, void *data,
void *buf1, void *buf2)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct ccw_request *req = &cdev->private->req;
CIO_TRACE_EVENT(4, "stlck");
CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
/* Request setup. */
memset(req, 0, sizeof(*req));
req->timeout = PGID_TIMEOUT;
req->maxretries = PGID_RETRIES;
req->lpm = sch->schib.pmcw.pam & sch->opm;
req->data = data;
req->callback = stlck_callback;
stlck_build_cp(cdev, buf1, buf2);
ccw_request_start(cdev);
}
/*
* Perform unconditional reserve + release.
*/
int ccw_device_stlck(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct stlck_data data;
u8 *buffer;
int rc;
/* Check if steal lock operation is valid for this device. */
if (cdev->drv) {
if (!cdev->private->options.force)
return -EINVAL;
}
buffer = kzalloc(64, GFP_DMA | GFP_KERNEL);
if (!buffer)
return -ENOMEM;
init_completion(&data.done);
data.rc = -EIO;
spin_lock_irq(sch->lock);
rc = cio_enable_subchannel(sch, (u32) (addr_t) sch);
if (rc)
goto out_unlock;
/* Perform operation. */
cdev->private->state = DEV_STATE_STEAL_LOCK;
ccw_device_stlck_start(cdev, &data, &buffer[0], &buffer[32]);
spin_unlock_irq(sch->lock);
/* Wait for operation to finish. */
if (wait_for_completion_interruptible(&data.done)) {
/* Got a signal. */
spin_lock_irq(sch->lock);
ccw_request_cancel(cdev);
spin_unlock_irq(sch->lock);
wait_for_completion(&data.done);
}
rc = data.rc;
/* Check results. */
spin_lock_irq(sch->lock);
cio_disable_subchannel(sch);
cdev->private->state = DEV_STATE_BOXED;
out_unlock:
spin_unlock_irq(sch->lock);
kfree(buffer);
return rc;
}
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