// SPDX-License-Identifier: GPL-1.0+
/*
* Copyright IBM Corp. 2002, 2009
*
* Author(s): Martin Schwidefsky ([email protected])
* Cornelia Huck ([email protected])
*/
#include <linux/export.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/completion.h>
#include <asm/ccwdev.h>
#include <asm/idals.h>
#include <asm/chpid.h>
#include <asm/fcx.h>
#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "chsc.h"
#include "device.h"
#include "chp.h"
/**
* ccw_device_set_options_mask() - set some options and unset the rest
* @cdev: device for which the options are to be set
* @flags: options to be set
*
* All flags specified in @flags are set, all flags not specified in @flags
* are cleared.
* Returns:
* %0 on success, -%EINVAL on an invalid flag combination.
*/
int ccw_device_set_options_mask(struct ccw_device *cdev, unsigned long flags)
{
/*
* The flag usage is mutal exclusive ...
*/
if ((flags & CCWDEV_EARLY_NOTIFICATION) &&
(flags & CCWDEV_REPORT_ALL))
return -EINVAL;
cdev->private->options.fast = (flags & CCWDEV_EARLY_NOTIFICATION) != 0;
cdev->private->options.repall = (flags & CCWDEV_REPORT_ALL) != 0;
cdev->private->options.pgroup = (flags & CCWDEV_DO_PATHGROUP) != 0;
cdev->private->options.force = (flags & CCWDEV_ALLOW_FORCE) != 0;
cdev->private->options.mpath = (flags & CCWDEV_DO_MULTIPATH) != 0;
return 0;
}
/**
* ccw_device_set_options() - set some options
* @cdev: device for which the options are to be set
* @flags: options to be set
*
* All flags specified in @flags are set, the remainder is left untouched.
* Returns:
* %0 on success, -%EINVAL if an invalid flag combination would ensue.
*/
int ccw_device_set_options(struct ccw_device *cdev, unsigned long flags)
{
/*
* The flag usage is mutal exclusive ...
*/
if (((flags & CCWDEV_EARLY_NOTIFICATION) &&
(flags & CCWDEV_REPORT_ALL)) ||
((flags & CCWDEV_EARLY_NOTIFICATION) &&
cdev->private->options.repall) ||
((flags & CCWDEV_REPORT_ALL) &&
cdev->private->options.fast))
return -EINVAL;
cdev->private->options.fast |= (flags & CCWDEV_EARLY_NOTIFICATION) != 0;
cdev->private->options.repall |= (flags & CCWDEV_REPORT_ALL) != 0;
cdev->private->options.pgroup |= (flags & CCWDEV_DO_PATHGROUP) != 0;
cdev->private->options.force |= (flags & CCWDEV_ALLOW_FORCE) != 0;
cdev->private->options.mpath |= (flags & CCWDEV_DO_MULTIPATH) != 0;
return 0;
}
/**
* ccw_device_clear_options() - clear some options
* @cdev: device for which the options are to be cleared
* @flags: options to be cleared
*
* All flags specified in @flags are cleared, the remainder is left untouched.
*/
void ccw_device_clear_options(struct ccw_device *cdev, unsigned long flags)
{
cdev->private->options.fast &= (flags & CCWDEV_EARLY_NOTIFICATION) == 0;
cdev->private->options.repall &= (flags & CCWDEV_REPORT_ALL) == 0;
cdev->private->options.pgroup &= (flags & CCWDEV_DO_PATHGROUP) == 0;
cdev->private->options.force &= (flags & CCWDEV_ALLOW_FORCE) == 0;
cdev->private->options.mpath &= (flags & CCWDEV_DO_MULTIPATH) == 0;
}
/**
* ccw_device_is_pathgroup() - determine if paths to this device are grouped
* @cdev: ccw device
*
* Return non-zero if there is a path group, zero otherwise.
*/
int ccw_device_is_pathgroup(struct ccw_device *cdev)
{
return cdev->private->flags.pgroup;
}
EXPORT_SYMBOL(ccw_device_is_pathgroup);
/**
* ccw_device_is_multipath() - determine if device is operating in multipath mode
* @cdev: ccw device
*
* Return non-zero if device is operating in multipath mode, zero otherwise.
*/
int ccw_device_is_multipath(struct ccw_device *cdev)
{
return cdev->private->flags.mpath;
}
EXPORT_SYMBOL(ccw_device_is_multipath);
/**
* ccw_device_clear() - terminate I/O request processing
* @cdev: target ccw device
* @intparm: interruption parameter to be returned upon conclusion of csch
*
* ccw_device_clear() calls csch on @cdev's subchannel.
* Returns:
* %0 on success,
* -%ENODEV on device not operational,
* -%EINVAL on invalid device state.
* Context:
* Interrupts disabled, ccw device lock held
*/
int ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
{
struct subchannel *sch;
int ret;
if (!cdev || !cdev->dev.parent)
return -ENODEV;
sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
if (cdev->private->state != DEV_STATE_ONLINE &&
cdev->private->state != DEV_STATE_W4SENSE)
return -EINVAL;
ret = cio_clear(sch);
if (ret == 0)
cdev->private->intparm = intparm;
return ret;
}
/**
* ccw_device_start_timeout_key() - start a s390 channel program with timeout and key
* @cdev: target ccw device
* @cpa: logical start address of channel program
* @intparm: user specific interruption parameter; will be presented back to
* @cdev's interrupt handler. Allows a device driver to associate
* the interrupt with a particular I/O request.
* @lpm: defines the channel path to be used for a specific I/O request. A
* value of 0 will make cio use the opm.
* @key: storage key to be used for the I/O
* @flags: additional flags; defines the action to be performed for I/O
* processing.
* @expires: timeout value in jiffies
*
* Start a S/390 channel program. When the interrupt arrives, the
* IRQ handler is called, either immediately, delayed (dev-end missing,
* or sense required) or never (no IRQ handler registered).
* This function notifies the device driver if the channel program has not
* completed during the time specified by @expires. If a timeout occurs, the
* channel program is terminated via xsch, hsch or csch, and the device's
* interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT).
* The interruption handler will echo back the @intparm specified here, unless
* another interruption parameter is specified by a subsequent invocation of
* ccw_device_halt() or ccw_device_clear().
* Returns:
* %0, if the operation was successful;
* -%EBUSY, if the device is busy, or status pending;
* -%EACCES, if no path specified in @lpm is operational;
* -%ENODEV, if the device is not operational.
* Context:
* Interrupts disabled, ccw device lock held
*/
int ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa,
unsigned long intparm, __u8 lpm, __u8 key,
unsigned long flags, int expires)
{
struct subchannel *sch;
int ret;
if (!cdev || !cdev->dev.parent)
return -ENODEV;
sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
if (cdev->private->state == DEV_STATE_VERIFY ||
cdev->private->flags.doverify) {
/* Remember to fake irb when finished. */
if (!cdev->private->flags.fake_irb) {
cdev->private->flags.fake_irb = FAKE_CMD_IRB;
cdev->private->intparm = intparm;
CIO_MSG_EVENT(2, "fakeirb: queue device 0.%x.%04x intparm %lx type=%d\n",
cdev->private->dev_id.ssid,
cdev->private->dev_id.devno, intparm,
cdev->private->flags.fake_irb);
return 0;
} else
/* There's already a fake I/O around. */
return -EBUSY;
}
if (cdev->private->state != DEV_STATE_ONLINE ||
((sch->schib.scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) &&
!(sch->schib.scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS)))
return -EBUSY;
ret = cio_set_options (sch, flags);
if (ret)
return ret;
/* Adjust requested path mask to exclude unusable paths. */
if (lpm) {
lpm &= sch->lpm;
if (lpm == 0)
return -EACCES;
}
ret = cio_start_key (sch, cpa, lpm, key);
switch (ret) {
case 0:
cdev->private->intparm = intparm;
if (expires)
ccw_device_set_timeout(cdev, expires);
break;
case -EACCES:
case -ENODEV:
dev_fsm_event(cdev, DEV_EVENT_VERIFY);
break;
}
return ret;
}
/**
* ccw_device_start_key() - start a s390 channel program with key
* @cdev: target ccw device
* @cpa: logical start address of channel program
* @intparm: user specific interruption parameter; will be presented back to
* @cdev's interrupt handler. Allows a device driver to associate
* the interrupt with a particular I/O request.
* @lpm: defines the channel path to be used for a specific I/O request. A
* value of 0 will make cio use the opm.
* @key: storage key to be used for the I/O
* @flags: additional flags; defines the action to be performed for I/O
* processing.
*
* Start a S/390 channel program. When the interrupt arrives, the
* IRQ handler is called, either immediately, delayed (dev-end missing,
* or sense required) or never (no IRQ handler registered).
* The interruption handler will echo back the @intparm specified here, unless
* another interruption parameter is specified by a subsequent invocation of
* ccw_device_halt() or ccw_device_clear().
* Returns:
* %0, if the operation was successful;
* -%EBUSY, if the device is busy, or status pending;
* -%EACCES, if no path specified in @lpm is operational;
* -%ENODEV, if the device is not operational.
* Context:
* Interrupts disabled, ccw device lock held
*/
int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
unsigned long intparm, __u8 lpm, __u8 key,
unsigned long flags)
{
return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm, key,
flags, 0);
}
/**
* ccw_device_start() - start a s390 channel program
* @cdev: target ccw device
* @cpa: logical start address of channel program
* @intparm: user specific interruption parameter; will be presented back to
* @cdev's interrupt handler. Allows a device driver to associate
* the interrupt with a particular I/O request.
* @lpm: defines the channel path to be used for a specific I/O request. A
* value of 0 will make cio use the opm.
* @flags: additional flags; defines the action to be performed for I/O
* processing.
*
* Start a S/390 channel program. When the interrupt arrives, the
* IRQ handler is called, either immediately, delayed (dev-end missing,
* or sense required) or never (no IRQ handler registered).
* The interruption handler will echo back the @intparm specified here, unless
* another interruption parameter is specified by a subsequent invocation of
* ccw_device_halt() or ccw_device_clear().
* Returns:
* %0, if the operation was successful;
* -%EBUSY, if the device is busy, or status pending;
* -%EACCES, if no path specified in @lpm is operational;
* -%ENODEV, if the device is not operational.
* Context:
* Interrupts disabled, ccw device lock held
*/
int ccw_device_start(struct ccw_device *cdev, struct ccw1 *cpa,
unsigned long intparm, __u8 lpm, unsigned long flags)
{
return ccw_device_start_key(cdev, cpa, intparm, lpm,
PAGE_DEFAULT_KEY, flags);
}
/**
* ccw_device_start_timeout() - start a s390 channel program with timeout
* @cdev: target ccw device
* @cpa: logical start address of channel program
* @intparm: user specific interruption parameter; will be presented back to
* @cdev's interrupt handler. Allows a device driver to associate
* the interrupt with a particular I/O request.
* @lpm: defines the channel path to be used for a specific I/O request. A
* value of 0 will make cio use the opm.
* @flags: additional flags; defines the action to be performed for I/O
* processing.
* @expires: timeout value in jiffies
*
* Start a S/390 channel program. When the interrupt arrives, the
* IRQ handler is called, either immediately, delayed (dev-end missing,
* or sense required) or never (no IRQ handler registered).
* This function notifies the device driver if the channel program has not
* completed during the time specified by @expires. If a timeout occurs, the
* channel program is terminated via xsch, hsch or csch, and the device's
* interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT).
* The interruption handler will echo back the @intparm specified here, unless
* another interruption parameter is specified by a subsequent invocation of
* ccw_device_halt() or ccw_device_clear().
* Returns:
* %0, if the operation was successful;
* -%EBUSY, if the device is busy, or status pending;
* -%EACCES, if no path specified in @lpm is operational;
* -%ENODEV, if the device is not operational.
* Context:
* Interrupts disabled, ccw device lock held
*/
int ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa,
unsigned long intparm, __u8 lpm,
unsigned long flags, int expires)
{
return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm,
PAGE_DEFAULT_KEY, flags,
expires);
}
/**
* ccw_device_halt() - halt I/O request processing
* @cdev: target ccw device
* @intparm: interruption parameter to be returned upon conclusion of hsch
*
* ccw_device_halt() calls hsch on @cdev's subchannel.
* The interruption handler will echo back the @intparm specified here, unless
* another interruption parameter is specified by a subsequent invocation of
* ccw_device_clear().
* Returns:
* %0 on success,
* -%ENODEV on device not operational,
* -%EINVAL on invalid device state,
* -%EBUSY on device busy or interrupt pending.
* Context:
* Interrupts disabled, ccw device lock held
*/
int ccw_device_halt(struct ccw_device *cdev, unsigned long intparm)
{
struct subchannel *sch;
int ret;
if (!cdev || !cdev->dev.parent)
return -ENODEV;
sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
if (cdev->private->state != DEV_STATE_ONLINE &&
cdev->private->state != DEV_STATE_W4SENSE)
return -EINVAL;
ret = cio_halt(sch);
if (ret == 0)
cdev->private->intparm = intparm;
return ret;
}
/**
* ccw_device_resume() - resume channel program execution
* @cdev: target ccw device
*
* ccw_device_resume() calls rsch on @cdev's subchannel.
* Returns:
* %0 on success,
* -%ENODEV on device not operational,
* -%EINVAL on invalid device state,
* -%EBUSY on device busy or interrupt pending.
* Context:
* Interrupts disabled, ccw device lock held
*/
int ccw_device_resume(struct ccw_device *cdev)
{
struct subchannel *sch;
if (!cdev || !cdev->dev.parent)
return -ENODEV;
sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
if (cdev->private->state != DEV_STATE_ONLINE ||
!(sch->schib.scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
return -EINVAL;
return cio_resume(sch);
}
/**
* ccw_device_get_ciw() - Search for CIW command in extended sense data.
* @cdev: ccw device to inspect
* @ct: command type to look for
*
* During SenseID, command information words (CIWs) describing special
* commands available to the device may have been stored in the extended
* sense data. This function searches for CIWs of a specified command
* type in the extended sense data.
* Returns:
* %NULL if no extended sense data has been stored or if no CIW of the
* specified command type could be found,
* else a pointer to the CIW of the specified command type.
*/
struct ciw *ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct)
{
int ciw_cnt;
if (cdev->private->flags.esid == 0)
return NULL;
for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++)
if (cdev->private->dma_area->senseid.ciw[ciw_cnt].ct == ct)
return cdev->private->dma_area->senseid.ciw + ciw_cnt;
return NULL;
}
/**
* ccw_device_get_path_mask() - get currently available paths
* @cdev: ccw device to be queried
* Returns:
* %0 if no subchannel for the device is available,
* else the mask of currently available paths for the ccw device's subchannel.
*/
__u8 ccw_device_get_path_mask(struct ccw_device *cdev)
{
struct subchannel *sch;
if (!cdev->dev.parent)
return 0;
sch = to_subchannel(cdev->dev.parent);
return sch->lpm;
}
/**
* ccw_device_get_chp_desc() - return newly allocated channel-path descriptor
* @cdev: device to obtain the descriptor for
* @chp_idx: index of the channel path
*
* On success return a newly allocated copy of the channel-path description
* data associated with the given channel path. Return %NULL on error.
*/
struct channel_path_desc_fmt0 *ccw_device_get_chp_desc(struct ccw_device *cdev,
int chp_idx)
{
struct subchannel *sch;
struct chp_id chpid;
sch = to_subchannel(cdev->dev.parent);
chp_id_init(&chpid);
chpid.id = sch->schib.pmcw.chpid[chp_idx];
return chp_get_chp_desc(chpid);
}
/**
* ccw_device_get_util_str() - return newly allocated utility strings
* @cdev: device to obtain the utility strings for
* @chp_idx: index of the channel path
*
* On success return a newly allocated copy of the utility strings
* associated with the given channel path. Return %NULL on error.
*/
u8 *ccw_device_get_util_str(struct ccw_device *cdev, int chp_idx)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct channel_path *chp;
struct chp_id chpid;
u8 *util_str;
chp_id_init(&chpid);
chpid.id = sch->schib.pmcw.chpid[chp_idx];
chp = chpid_to_chp(chpid);
util_str = kmalloc(sizeof(chp->desc_fmt3.util_str), GFP_KERNEL);
if (!util_str)
return NULL;
mutex_lock(&chp->lock);
memcpy(util_str, chp->desc_fmt3.util_str, sizeof(chp->desc_fmt3.util_str));
mutex_unlock(&chp->lock);
return util_str;
}
/**
* ccw_device_get_id() - obtain a ccw device id
* @cdev: device to obtain the id for
* @dev_id: where to fill in the values
*/
void ccw_device_get_id(struct ccw_device *cdev, struct ccw_dev_id *dev_id)
{
*dev_id = cdev->private->dev_id;
}
EXPORT_SYMBOL(ccw_device_get_id);
/**
* ccw_device_tm_start_timeout_key() - perform start function
* @cdev: ccw device on which to perform the start function
* @tcw: transport-command word to be started
* @intparm: user defined parameter to be passed to the interrupt handler
* @lpm: mask of paths to use
* @key: storage key to use for storage access
* @expires: time span in jiffies after which to abort request
*
* Start the tcw on the given ccw device. Return zero on success, non-zero
* otherwise.
*/
int ccw_device_tm_start_timeout_key(struct ccw_device *cdev, struct tcw *tcw,
unsigned long intparm, u8 lpm, u8 key,
int expires)
{
struct subchannel *sch;
int rc;
sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state == DEV_STATE_VERIFY) {
/* Remember to fake irb when finished. */
if (!cdev->private->flags.fake_irb) {
cdev->private->flags.fake_irb = FAKE_TM_IRB;
cdev->private->intparm = intparm;
CIO_MSG_EVENT(2, "fakeirb: queue device 0.%x.%04x intparm %lx type=%d\n",
cdev->private->dev_id.ssid,
cdev->private->dev_id.devno, intparm,
cdev->private->flags.fake_irb);
return 0;
} else
/* There's already a fake I/O around. */
return -EBUSY;
}
if (cdev->private->state != DEV_STATE_ONLINE)
return -EIO;
/* Adjust requested path mask to exclude unusable paths. */
if (lpm) {
lpm &= sch->lpm;
if (lpm == 0)
return -EACCES;
}
rc = cio_tm_start_key(sch, tcw, lpm, key);
if (rc == 0) {
cdev->private->intparm = intparm;
if (expires)
ccw_device_set_timeout(cdev, expires);
}
return rc;
}
EXPORT_SYMBOL(ccw_device_tm_start_timeout_key);
/**
* ccw_device_tm_start_key() - perform start function
* @cdev: ccw device on which to perform the start function
* @tcw: transport-command word to be started
* @intparm: user defined parameter to be passed to the interrupt handler
* @lpm: mask of paths to use
* @key: storage key to use for storage access
*
* Start the tcw on the given ccw device. Return zero on success, non-zero
* otherwise.
*/
int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
unsigned long intparm, u8 lpm, u8 key)
{
return ccw_device_tm_start_timeout_key(cdev, tcw, intparm, lpm, key, 0);
}
EXPORT_SYMBOL(ccw_device_tm_start_key);
/**
* ccw_device_tm_start() - perform start function
* @cdev: ccw device on which to perform the start function
* @tcw: transport-command word to be started
* @intparm: user defined parameter to be passed to the interrupt handler
* @lpm: mask of paths to use
*
* Start the tcw on the given ccw device. Return zero on success, non-zero
* otherwise.
*/
int ccw_device_tm_start(struct ccw_device *cdev, struct tcw *tcw,
unsigned long intparm, u8 lpm)
{
return ccw_device_tm_start_key(cdev, tcw, intparm, lpm,
PAGE_DEFAULT_KEY);
}
EXPORT_SYMBOL(ccw_device_tm_start);
/**
* ccw_device_tm_start_timeout() - perform start function
* @cdev: ccw device on which to perform the start function
* @tcw: transport-command word to be started
* @intparm: user defined parameter to be passed to the interrupt handler
* @lpm: mask of paths to use
* @expires: time span in jiffies after which to abort request
*
* Start the tcw on the given ccw device. Return zero on success, non-zero
* otherwise.
*/
int ccw_device_tm_start_timeout(struct ccw_device *cdev, struct tcw *tcw,
unsigned long intparm, u8 lpm, int expires)
{
return ccw_device_tm_start_timeout_key(cdev, tcw, intparm, lpm,
PAGE_DEFAULT_KEY, expires);
}
EXPORT_SYMBOL(ccw_device_tm_start_timeout);
/**
* ccw_device_get_mdc() - accumulate max data count
* @cdev: ccw device for which the max data count is accumulated
* @mask: mask of paths to use
*
* Return the number of 64K-bytes blocks all paths at least support
* for a transport command. Return value 0 indicates failure.
*/
int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct channel_path *chp;
struct chp_id chpid;
int mdc = 0, i;
/* Adjust requested path mask to excluded varied off paths. */
if (mask)
mask &= sch->lpm;
else
mask = sch->lpm;
chp_id_init(&chpid);
for (i = 0; i < 8; i++) {
if (!(mask & (0x80 >> i)))
continue;
chpid.id = sch->schib.pmcw.chpid[i];
chp = chpid_to_chp(chpid);
if (!chp)
continue;
mutex_lock(&chp->lock);
if (!chp->desc_fmt1.f) {
mutex_unlock(&chp->lock);
return 0;
}
if (!chp->desc_fmt1.r)
mdc = 1;
mdc = mdc ? min_t(int, mdc, chp->desc_fmt1.mdc) :
chp->desc_fmt1.mdc;
mutex_unlock(&chp->lock);
}
return mdc;
}
EXPORT_SYMBOL(ccw_device_get_mdc);
/**
* ccw_device_tm_intrg() - perform interrogate function
* @cdev: ccw device on which to perform the interrogate function
*
* Perform an interrogate function on the given ccw device. Return zero on
* success, non-zero otherwise.
*/
int ccw_device_tm_intrg(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state != DEV_STATE_ONLINE)
return -EIO;
if (!scsw_is_tm(&sch->schib.scsw) ||
!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_START_PEND))
return -EINVAL;
return cio_tm_intrg(sch);
}
EXPORT_SYMBOL(ccw_device_tm_intrg);
/**
* ccw_device_get_schid() - obtain a subchannel id
* @cdev: device to obtain the id for
* @schid: where to fill in the values
*/
void ccw_device_get_schid(struct ccw_device *cdev, struct subchannel_id *schid)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
*schid = sch->schid;
}
EXPORT_SYMBOL_GPL(ccw_device_get_schid);
/**
* ccw_device_pnso() - Perform Network-Subchannel Operation
* @cdev: device on which PNSO is performed
* @pnso_area: request and response block for the operation
* @oc: Operation Code
* @resume_token: resume token for multiblock response
* @cnc: Boolean change-notification control
*
* pnso_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
*
* Returns 0 on success.
*/
int ccw_device_pnso(struct ccw_device *cdev,
struct chsc_pnso_area *pnso_area, u8 oc,
struct chsc_pnso_resume_token resume_token, int cnc)
{
struct subchannel_id schid;
ccw_device_get_schid(cdev, &schid);
return chsc_pnso(schid, pnso_area, oc, resume_token, cnc);
}
EXPORT_SYMBOL_GPL(ccw_device_pnso);
/**
* ccw_device_get_cssid() - obtain Channel Subsystem ID
* @cdev: device to obtain the CSSID for
* @cssid: The resulting Channel Subsystem ID
*/
int ccw_device_get_cssid(struct ccw_device *cdev, u8 *cssid)
{
struct device *sch_dev = cdev->dev.parent;
struct channel_subsystem *css = to_css(sch_dev->parent);
if (css->id_valid)
*cssid = css->cssid;
return css->id_valid ? 0 : -ENODEV;
}
EXPORT_SYMBOL_GPL(ccw_device_get_cssid);
/**
* ccw_device_get_iid() - obtain MIF-image ID
* @cdev: device to obtain the MIF-image ID for
* @iid: The resulting MIF-image ID
*/
int ccw_device_get_iid(struct ccw_device *cdev, u8 *iid)
{
struct device *sch_dev = cdev->dev.parent;
struct channel_subsystem *css = to_css(sch_dev->parent);
if (css->id_valid)
*iid = css->iid;
return css->id_valid ? 0 : -ENODEV;
}
EXPORT_SYMBOL_GPL(ccw_device_get_iid);
/**
* ccw_device_get_chpid() - obtain Channel Path ID
* @cdev: device to obtain the Channel Path ID for
* @chp_idx: Index of the channel path
* @chpid: The resulting Channel Path ID
*/
int ccw_device_get_chpid(struct ccw_device *cdev, int chp_idx, u8 *chpid)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
int mask;
if ((chp_idx < 0) || (chp_idx > 7))
return -EINVAL;
mask = 0x80 >> chp_idx;
if (!(sch->schib.pmcw.pim & mask))
return -ENODEV;
*chpid = sch->schib.pmcw.chpid[chp_idx];
return 0;
}
EXPORT_SYMBOL_GPL(ccw_device_get_chpid);
/**
* ccw_device_get_chid() - obtain Channel ID associated with specified CHPID
* @cdev: device to obtain the Channel ID for
* @chp_idx: Index of the channel path
* @chid: The resulting Channel ID
*/
int ccw_device_get_chid(struct ccw_device *cdev, int chp_idx, u16 *chid)
{
struct chp_id cssid_chpid;
struct channel_path *chp;
int rc;
chp_id_init(&cssid_chpid);
rc = ccw_device_get_chpid(cdev, chp_idx, &cssid_chpid.id);
if (rc)
return rc;
chp = chpid_to_chp(cssid_chpid);
if (!chp)
return -ENODEV;
mutex_lock(&chp->lock);
if (chp->desc_fmt1.flags & 0x10)
*chid = chp->desc_fmt1.chid;
else
rc = -ENODEV;
mutex_unlock(&chp->lock);
return rc;
}
EXPORT_SYMBOL_GPL(ccw_device_get_chid);
/*
* Allocate zeroed dma coherent 31 bit addressable memory using
* the subchannels dma pool. Maximal size of allocation supported
* is PAGE_SIZE.
*/
void *ccw_device_dma_zalloc(struct ccw_device *cdev, size_t size,
dma32_t *dma_handle)
{
void *addr;
if (!get_device(&cdev->dev))
return NULL;
addr = __cio_gp_dma_zalloc(cdev->private->dma_pool, &cdev->dev, size, dma_handle);
if (IS_ERR_OR_NULL(addr))
put_device(&cdev->dev);
return addr;
}
EXPORT_SYMBOL(ccw_device_dma_zalloc);
void ccw_device_dma_free(struct ccw_device *cdev, void *cpu_addr, size_t size)
{
if (!cpu_addr)
return;
cio_gp_dma_free(cdev->private->dma_pool, cpu_addr, size);
put_device(&cdev->dev);
}
EXPORT_SYMBOL(ccw_device_dma_free);
EXPORT_SYMBOL(ccw_device_set_options_mask);
EXPORT_SYMBOL(ccw_device_set_options);
EXPORT_SYMBOL(ccw_device_clear_options);
EXPORT_SYMBOL(ccw_device_clear);
EXPORT_SYMBOL(ccw_device_halt);
EXPORT_SYMBOL(ccw_device_resume);
EXPORT_SYMBOL(ccw_device_start_timeout);
EXPORT_SYMBOL(ccw_device_start);
EXPORT_SYMBOL(ccw_device_start_timeout_key);
EXPORT_SYMBOL(ccw_device_start_key);
EXPORT_SYMBOL(ccw_device_get_ciw);
EXPORT_SYMBOL(ccw_device_get_path_mask);
EXPORT_SYMBOL_GPL(ccw_device_get_chp_desc);
EXPORT_SYMBOL_GPL(ccw_device_get_util_str);
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