728 lines
18 KiB
C
728 lines
18 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* CCW device PGID and path verification I/O handling.
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*
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* Copyright IBM Corp. 2002, 2009
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* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/bitops.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <asm/ccwdev.h>
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#include <asm/cio.h>
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#include "cio.h"
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#include "cio_debug.h"
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#include "device.h"
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#include "io_sch.h"
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#define PGID_RETRIES 256
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#define PGID_TIMEOUT (10 * HZ)
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static void verify_start(struct ccw_device *cdev);
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/*
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* Process path verification data and report result.
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*/
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static void verify_done(struct ccw_device *cdev, int rc)
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{
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struct subchannel *sch = to_subchannel(cdev->dev.parent);
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struct ccw_dev_id *id = &cdev->private->dev_id;
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int mpath = cdev->private->flags.mpath;
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int pgroup = cdev->private->flags.pgroup;
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if (rc)
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goto out;
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/* Ensure consistent multipathing state at device and channel. */
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if (sch->config.mp != mpath) {
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sch->config.mp = mpath;
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rc = cio_commit_config(sch);
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}
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out:
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CIO_MSG_EVENT(2, "vrfy: device 0.%x.%04x: rc=%d pgroup=%d mpath=%d "
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"vpm=%02x\n", id->ssid, id->devno, rc, pgroup, mpath,
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sch->vpm);
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ccw_device_verify_done(cdev, rc);
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}
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/*
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* Create channel program to perform a NOOP.
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*/
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static void nop_build_cp(struct ccw_device *cdev)
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{
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struct ccw_request *req = &cdev->private->req;
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struct ccw1 *cp = cdev->private->dma_area->iccws;
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cp->cmd_code = CCW_CMD_NOOP;
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cp->cda = 0;
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cp->count = 0;
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cp->flags = CCW_FLAG_SLI;
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req->cp = cp;
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}
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/*
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* Perform NOOP on a single path.
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*/
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static void nop_do(struct ccw_device *cdev)
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{
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struct subchannel *sch = to_subchannel(cdev->dev.parent);
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struct ccw_request *req = &cdev->private->req;
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req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam & sch->opm &
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~cdev->private->path_noirq_mask);
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if (!req->lpm)
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goto out_nopath;
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nop_build_cp(cdev);
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ccw_request_start(cdev);
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return;
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out_nopath:
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verify_done(cdev, sch->vpm ? 0 : -EACCES);
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}
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/*
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* Adjust NOOP I/O status.
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*/
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static enum io_status nop_filter(struct ccw_device *cdev, void *data,
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struct irb *irb, enum io_status status)
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{
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/* Only subchannel status might indicate a path error. */
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if (status == IO_STATUS_ERROR && irb->scsw.cmd.cstat == 0)
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return IO_DONE;
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return status;
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}
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/*
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* Process NOOP request result for a single path.
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*/
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static void nop_callback(struct ccw_device *cdev, void *data, int rc)
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{
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struct subchannel *sch = to_subchannel(cdev->dev.parent);
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struct ccw_request *req = &cdev->private->req;
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switch (rc) {
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case 0:
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sch->vpm |= req->lpm;
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break;
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case -ETIME:
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cdev->private->path_noirq_mask |= req->lpm;
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break;
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case -EACCES:
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cdev->private->path_notoper_mask |= req->lpm;
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break;
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default:
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goto err;
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}
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/* Continue on the next path. */
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req->lpm >>= 1;
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nop_do(cdev);
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return;
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err:
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verify_done(cdev, rc);
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}
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/*
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* Create channel program to perform SET PGID on a single path.
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*/
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static void spid_build_cp(struct ccw_device *cdev, u8 fn)
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{
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struct ccw_request *req = &cdev->private->req;
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struct ccw1 *cp = cdev->private->dma_area->iccws;
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int i = pathmask_to_pos(req->lpm);
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struct pgid *pgid = &cdev->private->dma_area->pgid[i];
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pgid->inf.fc = fn;
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cp->cmd_code = CCW_CMD_SET_PGID;
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cp->cda = (u32)virt_to_phys(pgid);
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cp->count = sizeof(*pgid);
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cp->flags = CCW_FLAG_SLI;
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req->cp = cp;
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}
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static void pgid_wipeout_callback(struct ccw_device *cdev, void *data, int rc)
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{
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if (rc) {
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/* We don't know the path groups' state. Abort. */
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verify_done(cdev, rc);
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return;
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}
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/*
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* Path groups have been reset. Restart path verification but
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* leave paths in path_noirq_mask out.
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*/
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cdev->private->flags.pgid_unknown = 0;
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verify_start(cdev);
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}
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/*
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* Reset pathgroups and restart path verification, leave unusable paths out.
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*/
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static void pgid_wipeout_start(struct ccw_device *cdev)
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{
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struct subchannel *sch = to_subchannel(cdev->dev.parent);
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struct ccw_dev_id *id = &cdev->private->dev_id;
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struct ccw_request *req = &cdev->private->req;
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u8 fn;
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CIO_MSG_EVENT(2, "wipe: device 0.%x.%04x: pvm=%02x nim=%02x\n",
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id->ssid, id->devno, cdev->private->pgid_valid_mask,
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cdev->private->path_noirq_mask);
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/* Initialize request data. */
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memset(req, 0, sizeof(*req));
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req->timeout = PGID_TIMEOUT;
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req->maxretries = PGID_RETRIES;
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req->lpm = sch->schib.pmcw.pam;
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req->callback = pgid_wipeout_callback;
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fn = SPID_FUNC_DISBAND;
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if (cdev->private->flags.mpath)
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fn |= SPID_FUNC_MULTI_PATH;
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spid_build_cp(cdev, fn);
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ccw_request_start(cdev);
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}
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/*
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* Perform establish/resign SET PGID on a single path.
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*/
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static void spid_do(struct ccw_device *cdev)
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{
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struct subchannel *sch = to_subchannel(cdev->dev.parent);
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struct ccw_request *req = &cdev->private->req;
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u8 fn;
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/* Use next available path that is not already in correct state. */
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req->lpm = lpm_adjust(req->lpm, cdev->private->pgid_todo_mask);
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if (!req->lpm)
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goto out_nopath;
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/* Channel program setup. */
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if (req->lpm & sch->opm)
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fn = SPID_FUNC_ESTABLISH;
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else
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fn = SPID_FUNC_RESIGN;
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if (cdev->private->flags.mpath)
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fn |= SPID_FUNC_MULTI_PATH;
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spid_build_cp(cdev, fn);
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ccw_request_start(cdev);
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return;
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out_nopath:
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if (cdev->private->flags.pgid_unknown) {
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/* At least one SPID could be partially done. */
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pgid_wipeout_start(cdev);
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return;
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}
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verify_done(cdev, sch->vpm ? 0 : -EACCES);
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}
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/*
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* Process SET PGID request result for a single path.
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*/
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static void spid_callback(struct ccw_device *cdev, void *data, int rc)
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{
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struct subchannel *sch = to_subchannel(cdev->dev.parent);
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struct ccw_request *req = &cdev->private->req;
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switch (rc) {
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case 0:
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sch->vpm |= req->lpm & sch->opm;
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break;
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case -ETIME:
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cdev->private->flags.pgid_unknown = 1;
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cdev->private->path_noirq_mask |= req->lpm;
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break;
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case -EACCES:
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cdev->private->path_notoper_mask |= req->lpm;
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break;
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case -EOPNOTSUPP:
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if (cdev->private->flags.mpath) {
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/* Try without multipathing. */
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cdev->private->flags.mpath = 0;
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goto out_restart;
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}
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/* Try without pathgrouping. */
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cdev->private->flags.pgroup = 0;
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goto out_restart;
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default:
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goto err;
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}
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req->lpm >>= 1;
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spid_do(cdev);
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return;
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out_restart:
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verify_start(cdev);
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return;
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err:
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verify_done(cdev, rc);
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}
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static void spid_start(struct ccw_device *cdev)
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{
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struct ccw_request *req = &cdev->private->req;
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/* Initialize request data. */
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memset(req, 0, sizeof(*req));
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req->timeout = PGID_TIMEOUT;
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req->maxretries = PGID_RETRIES;
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req->lpm = 0x80;
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req->singlepath = 1;
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req->callback = spid_callback;
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spid_do(cdev);
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}
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static int pgid_is_reset(struct pgid *p)
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{
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char *c;
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for (c = (char *)p + 1; c < (char *)(p + 1); c++) {
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if (*c != 0)
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return 0;
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}
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return 1;
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}
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static int pgid_cmp(struct pgid *p1, struct pgid *p2)
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{
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return memcmp((char *) p1 + 1, (char *) p2 + 1,
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sizeof(struct pgid) - 1);
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}
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/*
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* Determine pathgroup state from PGID data.
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*/
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static void pgid_analyze(struct ccw_device *cdev, struct pgid **p,
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int *mismatch, u8 *reserved, u8 *reset)
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{
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struct pgid *pgid = &cdev->private->dma_area->pgid[0];
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struct pgid *first = NULL;
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int lpm;
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int i;
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*mismatch = 0;
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*reserved = 0;
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*reset = 0;
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for (i = 0, lpm = 0x80; i < 8; i++, pgid++, lpm >>= 1) {
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if ((cdev->private->pgid_valid_mask & lpm) == 0)
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continue;
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if (pgid->inf.ps.state2 == SNID_STATE2_RESVD_ELSE)
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*reserved |= lpm;
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if (pgid_is_reset(pgid)) {
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*reset |= lpm;
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continue;
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}
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if (!first) {
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first = pgid;
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continue;
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}
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if (pgid_cmp(pgid, first) != 0)
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*mismatch = 1;
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}
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if (!first)
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first = &channel_subsystems[0]->global_pgid;
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*p = first;
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}
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static u8 pgid_to_donepm(struct ccw_device *cdev)
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{
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struct subchannel *sch = to_subchannel(cdev->dev.parent);
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struct pgid *pgid;
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int i;
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int lpm;
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u8 donepm = 0;
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/* Set bits for paths which are already in the target state. */
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for (i = 0; i < 8; i++) {
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lpm = 0x80 >> i;
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if ((cdev->private->pgid_valid_mask & lpm) == 0)
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continue;
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pgid = &cdev->private->dma_area->pgid[i];
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if (sch->opm & lpm) {
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if (pgid->inf.ps.state1 != SNID_STATE1_GROUPED)
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continue;
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} else {
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if (pgid->inf.ps.state1 != SNID_STATE1_UNGROUPED)
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continue;
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}
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if (cdev->private->flags.mpath) {
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if (pgid->inf.ps.state3 != SNID_STATE3_MULTI_PATH)
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continue;
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} else {
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if (pgid->inf.ps.state3 != SNID_STATE3_SINGLE_PATH)
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continue;
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}
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donepm |= lpm;
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}
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return donepm;
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}
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static void pgid_fill(struct ccw_device *cdev, struct pgid *pgid)
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{
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int i;
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for (i = 0; i < 8; i++)
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memcpy(&cdev->private->dma_area->pgid[i], pgid,
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sizeof(struct pgid));
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||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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->dma_area->iccws;
|
||
|
|
int i = pathmask_to_pos(req->lpm);
|
||
|
|
|
||
|
|
/* Channel program setup. */
|
||
|
|
cp->cmd_code = CCW_CMD_SENSE_PGID;
|
||
|
|
cp->cda = (u32)virt_to_phys(&cdev->private->dma_area->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->dma_area->pgid, 0,
|
||
|
|
sizeof(cdev->private->dma_area->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->dma_area->iccws;
|
||
|
|
|
||
|
|
cp[0].cmd_code = CCW_CMD_STLCK;
|
||
|
|
cp[0].cda = (u32)virt_to_phys(buf1);
|
||
|
|
cp[0].count = 32;
|
||
|
|
cp[0].flags = CCW_FLAG_CC;
|
||
|
|
cp[1].cmd_code = CCW_CMD_RELEASE;
|
||
|
|
cp[1].cda = (u32)virt_to_phys(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)virt_to_phys(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;
|
||
|
|
}
|