[RFC PATCH 05/12] s390/cio: add protected virtualization support to cio

Halil Pasic
2019-04-04T23:16:15Z

Virtio-ccw relies on cio mechanisms for bootstrapping the ccw device.
Thus we need to make sure any memory that is used for communication with
the hypervisor is shared.

Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
---
drivers/s390/cio/ccwreq.c | 8 +++----
drivers/s390/cio/device.c | 46 +++++++++++++++++++++++++++++++---------
drivers/s390/cio/device_fsm.c | 40 +++++++++++++++++-----------------
drivers/s390/cio/device_id.c | 18 ++++++++--------
drivers/s390/cio/device_ops.c | 4 ++--
drivers/s390/cio/device_pgid.c | 20 ++++++++---------
drivers/s390/cio/device_status.c | 24 ++++++++++-----------
drivers/s390/cio/io_sch.h | 19 ++++++++++++-----
8 files changed, 107 insertions(+), 72 deletions(-)

diff --git a/drivers/s390/cio/ccwreq.c b/drivers/s390/cio/ccwreq.c
index 603268a33ea1..dafbceb311b3 100644
--- a/drivers/s390/cio/ccwreq.c
+++ b/drivers/s390/cio/ccwreq.c
@@ -63,7 +63,7 @@ static void ccwreq_stop(struct ccw_device *cdev, int rc)
return;
req->done = 1;
ccw_device_set_timeout(cdev, 0);
- memset(&cdev->private->irb, 0, sizeof(struct irb));
+ memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
if (rc && rc != -ENODEV && req->drc)
rc = req->drc;
req->callback(cdev, req->data, rc);
@@ -86,7 +86,7 @@ static void ccwreq_do(struct ccw_device *cdev)
continue;
}
/* Perform start function. */
- memset(&cdev->private->irb, 0, sizeof(struct irb));
+ memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
rc = cio_start(sch, cp, (u8) req->mask);
if (rc == 0) {
/* I/O started successfully. */
@@ -169,7 +169,7 @@ int ccw_request_cancel(struct ccw_device *cdev)
*/
static enum io_status ccwreq_status(struct ccw_device *cdev, struct irb *lcirb)
{
- struct irb *irb = &cdev->private->irb;
+ struct irb *irb = &cdev->private->dma_area->irb;
struct cmd_scsw *scsw = &irb->scsw.cmd;
enum uc_todo todo;

@@ -187,7 +187,7 @@ static enum io_status ccwreq_status(struct ccw_device *cdev, struct irb *lcirb)
CIO_TRACE_EVENT(2, "sensedata");
CIO_HEX_EVENT(2, &cdev->private->dev_id,
sizeof(struct ccw_dev_id));
- CIO_HEX_EVENT(2, &cdev->private->irb.ecw, SENSE_MAX_COUNT);
+ CIO_HEX_EVENT(2, &cdev->private->dma_area->irb.ecw, SENSE_MAX_COUNT);
/* Check for command reject. */
if (irb->ecw[0] & SNS0_CMD_REJECT)
return IO_REJECTED;
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 1540229a37bb..62f50e288740 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -689,6 +689,7 @@ ccw_device_release(struct device *dev)
cdev = to_ccwdev(dev);
/* Release reference of parent subchannel. */
put_device(cdev->dev.parent);
+ cio_dma_free(cdev->private->dma_area, sizeof(*cdev->private->dma_area));
kfree(cdev->private);
kfree(cdev);
}
@@ -698,13 +699,22 @@ static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
struct ccw_device *cdev;

cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
- if (cdev) {
- cdev->private = kzalloc(sizeof(struct ccw_device_private),
- GFP_KERNEL | GFP_DMA);
- if (cdev->private)
- return cdev;
- }
+ if (!cdev)
+ goto err_cdev;
+ cdev->private = kzalloc(sizeof(struct ccw_device_private),
+ GFP_KERNEL | GFP_DMA);
+ if (!cdev->private)
+ goto err_priv;
+ cdev->private->dma_area = cio_dma_zalloc(
+ sizeof(*cdev->private->dma_area));
+ if (!cdev->private->dma_area)
+ goto err_dma_area;
+ return cdev;
+err_dma_area:
+ kfree(cdev->private);
+err_priv:
kfree(cdev);
+err_cdev:
return ERR_PTR(-ENOMEM);
}

@@ -1061,6 +1071,11 @@ static int io_subchannel_probe(struct subchannel *sch)
io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA);
if (!io_priv)
goto out_schedule;
+ io_priv->dma_area = cio_dma_zalloc(sizeof(*io_priv->dma_area));
+ if (!io_priv->dma_area) {
+ kfree(io_priv);
+ goto out_schedule;
+ }

set_io_private(sch, io_priv);
css_schedule_eval(sch->schid);
@@ -1088,6 +1103,7 @@ static int io_subchannel_remove(struct subchannel *sch)
set_io_private(sch, NULL);
spin_unlock_irq(sch->lock);
out_free:
+ cio_dma_free(io_priv->dma_area, sizeof(*io_priv->dma_area));
kfree(io_priv);
sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
return 0;
@@ -1593,20 +1609,29 @@ struct ccw_device * __init ccw_device_create_console(struct ccw_driver *drv)
return ERR_CAST(sch);

io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA);
- if (!io_priv) {
- put_device(&sch->dev);
- return ERR_PTR(-ENOMEM);
- }
+ if (!io_priv)
+ goto err_priv;
+ io_priv->dma_area = cio_dma_zalloc(sizeof(*io_priv->dma_area));
+ if (!io_priv->dma_area)
+ goto err_dma_area;
set_io_private(sch, io_priv);
cdev = io_subchannel_create_ccwdev(sch);
if (IS_ERR(cdev)) {
put_device(&sch->dev);
+ cio_dma_free(io_priv->dma_area, sizeof(*io_priv->dma_area));
kfree(io_priv);
return cdev;
}
cdev->drv = drv;
ccw_device_set_int_class(cdev);
return cdev;
+
+err_dma_area:
+ kfree(io_priv);
+err_priv:
+ put_device(&sch->dev);
+ return ERR_PTR(-ENOMEM);
+
}

void __init ccw_device_destroy_console(struct ccw_device *cdev)
@@ -1617,6 +1642,7 @@ void __init ccw_device_destroy_console(struct ccw_device *cdev)
set_io_private(sch, NULL);
put_device(&sch->dev);
put_device(&cdev->dev);
+ cio_dma_free(io_priv->dma_area, sizeof(*io_priv->dma_area));
kfree(io_priv);
}

diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index 9169af7dbb43..fea23b44795b 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -67,8 +67,8 @@ static void ccw_timeout_log(struct ccw_device *cdev)
sizeof(struct tcw), 0);
} else {
printk(KERN_WARNING "cio: orb indicates command mode\n");
- if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw ||
- (void *)(addr_t)orb->cmd.cpa == cdev->private->iccws)
+ if ((void *)(addr_t)orb->cmd.cpa == &private->dma_area->sense_ccw ||
+ (void *)(addr_t)orb->cmd.cpa == cdev->private->dma_area->iccws)
printk(KERN_WARNING "cio: last channel program "
"(intern):\n");
else
@@ -143,18 +143,18 @@ ccw_device_cancel_halt_clear(struct ccw_device *cdev)
void ccw_device_update_sense_data(struct ccw_device *cdev)
{
memset(&cdev->id, 0, sizeof(cdev->id));
- cdev->id.cu_type = cdev->private->senseid.cu_type;
- cdev->id.cu_model = cdev->private->senseid.cu_model;
- cdev->id.dev_type = cdev->private->senseid.dev_type;
- cdev->id.dev_model = cdev->private->senseid.dev_model;
+ cdev->id.cu_type = cdev->private->dma_area->senseid.cu_type;
+ cdev->id.cu_model = cdev->private->dma_area->senseid.cu_model;
+ cdev->id.dev_type = cdev->private->dma_area->senseid.dev_type;
+ cdev->id.dev_model = cdev->private->dma_area->senseid.dev_model;
}

int ccw_device_test_sense_data(struct ccw_device *cdev)
{
- return cdev->id.cu_type == cdev->private->senseid.cu_type &&
- cdev->id.cu_model == cdev->private->senseid.cu_model &&
- cdev->id.dev_type == cdev->private->senseid.dev_type &&
- cdev->id.dev_model == cdev->private->senseid.dev_model;
+ return cdev->id.cu_type == cdev->private->dma_area->senseid.cu_type &&
+ cdev->id.cu_model == cdev->private->dma_area->senseid.cu_model &&
+ cdev->id.dev_type == cdev->private->dma_area->senseid.dev_type &&
+ cdev->id.dev_model == cdev->private->dma_area->senseid.dev_model;
}

/*
@@ -342,7 +342,7 @@ ccw_device_done(struct ccw_device *cdev, int state)
cio_disable_subchannel(sch);

/* Reset device status. */
- memset(&cdev->private->irb, 0, sizeof(struct irb));
+ memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));

cdev->private->state = state;

@@ -509,13 +509,13 @@ void ccw_device_verify_done(struct ccw_device *cdev, int err)
ccw_device_done(cdev, DEV_STATE_ONLINE);
/* Deliver fake irb to device driver, if needed. */
if (cdev->private->flags.fake_irb) {
- create_fake_irb(&cdev->private->irb,
+ create_fake_irb(&cdev->private->dma_area->irb,
cdev->private->flags.fake_irb);
cdev->private->flags.fake_irb = 0;
if (cdev->handler)
cdev->handler(cdev, cdev->private->intparm,
- &cdev->private->irb);
- memset(&cdev->private->irb, 0, sizeof(struct irb));
+ &cdev->private->dma_area->irb);
+ memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
}
ccw_device_report_path_events(cdev);
ccw_device_handle_broken_paths(cdev);
@@ -672,7 +672,7 @@ ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)

if (scsw_actl(&sch->schib.scsw) != 0 ||
(scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) ||
- (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
+ (scsw_stctl(&cdev->private->dma_area->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
/*
* No final status yet or final status not yet delivered
* to the device driver. Can't do path verification now,
@@ -719,7 +719,7 @@ static int ccw_device_call_handler(struct ccw_device *cdev)
* - fast notification was requested (primary status)
* - unsolicited interrupts
*/
- stctl = scsw_stctl(&cdev->private->irb.scsw);
+ stctl = scsw_stctl(&cdev->private->dma_area->irb.scsw);
ending_status = (stctl & SCSW_STCTL_SEC_STATUS) ||
(stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) ||
(stctl == SCSW_STCTL_STATUS_PEND);
@@ -735,9 +735,9 @@ static int ccw_device_call_handler(struct ccw_device *cdev)

if (cdev->handler)
cdev->handler(cdev, cdev->private->intparm,
- &cdev->private->irb);
+ &cdev->private->dma_area->irb);

- memset(&cdev->private->irb, 0, sizeof(struct irb));
+ memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
return 1;
}

@@ -759,7 +759,7 @@ ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
/* Unit check but no sense data. Need basic sense. */
if (ccw_device_do_sense(cdev, irb) != 0)
goto call_handler_unsol;
- memcpy(&cdev->private->irb, irb, sizeof(struct irb));
+ memcpy(&cdev->private->dma_area->irb, irb, sizeof(struct irb));
cdev->private->state = DEV_STATE_W4SENSE;
cdev->private->intparm = 0;
return;
@@ -842,7 +842,7 @@ ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
if (scsw_fctl(&irb->scsw) &
(SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
cdev->private->flags.dosense = 0;
- memset(&cdev->private->irb, 0, sizeof(struct irb));
+ memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
ccw_device_accumulate_irb(cdev, irb);
goto call_handler;
}
diff --git a/drivers/s390/cio/device_id.c b/drivers/s390/cio/device_id.c
index f6df83a9dfbb..ea8a0fc6c0b6 100644
--- a/drivers/s390/cio/device_id.c
+++ b/drivers/s390/cio/device_id.c
@@ -99,7 +99,7 @@ static int diag210_to_senseid(struct senseid *senseid, struct diag210 *diag)
static int diag210_get_dev_info(struct ccw_device *cdev)
{
struct ccw_dev_id *dev_id = &cdev->private->dev_id;
- struct senseid *senseid = &cdev->private->senseid;
+ struct senseid *senseid = &cdev->private->dma_area->senseid;
struct diag210 diag_data;
int rc;

@@ -134,8 +134,8 @@ static int diag210_get_dev_info(struct ccw_device *cdev)
static void snsid_init(struct ccw_device *cdev)
{
cdev->private->flags.esid = 0;
- memset(&cdev->private->senseid, 0, sizeof(cdev->private->senseid));
- cdev->private->senseid.cu_type = 0xffff;
+ memset(&cdev->private->dma_area->senseid, 0, sizeof(cdev->private->dma_area->senseid));
+ cdev->private->dma_area->senseid.cu_type = 0xffff;
}

/*
@@ -143,16 +143,16 @@ static void snsid_init(struct ccw_device *cdev)
*/
static int snsid_check(struct ccw_device *cdev, void *data)
{
- struct cmd_scsw *scsw = &cdev->private->irb.scsw.cmd;
+ struct cmd_scsw *scsw = &cdev->private->dma_area->irb.scsw.cmd;
int len = sizeof(struct senseid) - scsw->count;

/* Check for incomplete SENSE ID data. */
if (len < SENSE_ID_MIN_LEN)
goto out_restart;
- if (cdev->private->senseid.cu_type == 0xffff)
+ if (cdev->private->dma_area->senseid.cu_type == 0xffff)
goto out_restart;
/* Check for incompatible SENSE ID data. */
- if (cdev->private->senseid.reserved != 0xff)
+ if (cdev->private->dma_area->senseid.reserved != 0xff)
return -EOPNOTSUPP;
/* Check for extended-identification information. */
if (len > SENSE_ID_BASIC_LEN)
@@ -170,7 +170,7 @@ static int snsid_check(struct ccw_device *cdev, void *data)
static void snsid_callback(struct ccw_device *cdev, void *data, int rc)
{
struct ccw_dev_id *id = &cdev->private->dev_id;
- struct senseid *senseid = &cdev->private->senseid;
+ struct senseid *senseid = &cdev->private->dma_area->senseid;
int vm = 0;

if (rc && MACHINE_IS_VM) {
@@ -200,7 +200,7 @@ void ccw_device_sense_id_start(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct ccw_request *req = &cdev->private->req;
- struct ccw1 *cp = cdev->private->iccws;
+ struct ccw1 *cp = cdev->private->dma_area->iccws;

CIO_TRACE_EVENT(4, "snsid");
CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
@@ -208,7 +208,7 @@ void ccw_device_sense_id_start(struct ccw_device *cdev)
snsid_init(cdev);
/* Channel program setup. */
cp->cmd_code = CCW_CMD_SENSE_ID;
- cp->cda = (u32) (addr_t) &cdev->private->senseid;
+ cp->cda = (u32) (addr_t) &cdev->private->dma_area->senseid;
cp->count = sizeof(struct senseid);
cp->flags = CCW_FLAG_SLI;
/* Request setup. */
diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c
index 4435ae0b3027..8c3ccb8768a0 100644
--- a/drivers/s390/cio/device_ops.c
+++ b/drivers/s390/cio/device_ops.c
@@ -429,8 +429,8 @@ struct ciw *ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct)
if (cdev->private->flags.esid == 0)
return NULL;
for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++)
- if (cdev->private->senseid.ciw[ciw_cnt].ct == ct)
- return cdev->private->senseid.ciw + ciw_cnt;
+ if (cdev->private->dma_area->senseid.ciw[ciw_cnt].ct == ct)
+ return cdev->private->dma_area->senseid.ciw + ciw_cnt;
return NULL;
}

diff --git a/drivers/s390/cio/device_pgid.c b/drivers/s390/cio/device_pgid.c
index d30a3babf176..e97baa89cbf8 100644
--- a/drivers/s390/cio/device_pgid.c
+++ b/drivers/s390/cio/device_pgid.c
@@ -57,7 +57,7 @@ static void verify_done(struct ccw_device *cdev, int rc)
static void nop_build_cp(struct ccw_device *cdev)
{
struct ccw_request *req = &cdev->private->req;
- struct ccw1 *cp = cdev->private->iccws;
+ struct ccw1 *cp = cdev->private->dma_area->iccws;

cp->cmd_code = CCW_CMD_NOOP;
cp->cda = 0;
@@ -134,9 +134,9 @@ static void nop_callback(struct ccw_device *cdev, void *data, int rc)
static void spid_build_cp(struct ccw_device *cdev, u8 fn)
{
struct ccw_request *req = &cdev->private->req;
- struct ccw1 *cp = cdev->private->iccws;
+ struct ccw1 *cp = cdev->private->dma_area->iccws;
int i = pathmask_to_pos(req->lpm);
- struct pgid *pgid = &cdev->private->pgid[i];
+ struct pgid *pgid = &cdev->private->dma_area->pgid[i];

pgid->inf.fc = fn;
cp->cmd_code = CCW_CMD_SET_PGID;
@@ -300,7 +300,7 @@ static int pgid_cmp(struct pgid *p1, struct pgid *p2)
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 *pgid = &cdev->private->dma_area->pgid[0];
struct pgid *first = NULL;
int lpm;
int i;
@@ -342,7 +342,7 @@ static u8 pgid_to_donepm(struct ccw_device *cdev)
lpm = 0x80 >> i;
if ((cdev->private->pgid_valid_mask & lpm) == 0)
continue;
- pgid = &cdev->private->pgid[i];
+ pgid = &cdev->private->dma_area->pgid[i];
if (sch->opm & lpm) {
if (pgid->inf.ps.state1 != SNID_STATE1_GROUPED)
continue;
@@ -368,7 +368,7 @@ 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));
+ memcpy(&cdev->private->dma_area->pgid[i], pgid, sizeof(struct pgid));
}

/*
@@ -435,12 +435,12 @@ static void snid_done(struct ccw_device *cdev, int rc)
static void snid_build_cp(struct ccw_device *cdev)
{
struct ccw_request *req = &cdev->private->req;
- struct ccw1 *cp = cdev->private->iccws;
+ 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) (addr_t) &cdev->private->pgid[i];
+ cp->cda = (u32) (addr_t) &cdev->private->dma_area->pgid[i];
cp->count = sizeof(struct pgid);
cp->flags = CCW_FLAG_SLI;
req->cp = cp;
@@ -516,7 +516,7 @@ static void verify_start(struct ccw_device *cdev)
sch->lpm = sch->schib.pmcw.pam;

/* Initialize PGID data. */
- memset(cdev->private->pgid, 0, sizeof(cdev->private->pgid));
+ 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;
@@ -626,7 +626,7 @@ struct stlck_data {
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;
+ struct ccw1 *cp = cdev->private->dma_area->iccws;

cp[0].cmd_code = CCW_CMD_STLCK;
cp[0].cda = (u32) (addr_t) buf1;
diff --git a/drivers/s390/cio/device_status.c b/drivers/s390/cio/device_status.c
index 7d5c7892b2c4..a9aabde604f4 100644
--- a/drivers/s390/cio/device_status.c
+++ b/drivers/s390/cio/device_status.c
@@ -79,15 +79,15 @@ ccw_device_accumulate_ecw(struct ccw_device *cdev, struct irb *irb)
* are condition that have to be met for the extended control
* bit to have meaning. Sick.
*/
- cdev->private->irb.scsw.cmd.ectl = 0;
+ cdev->private->dma_area->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;
+ cdev->private->dma_area->irb.scsw.cmd.ectl = irb->scsw.cmd.ectl;
/* Check if extended control word is valid. */
- if (!cdev->private->irb.scsw.cmd.ectl)
+ if (!cdev->private->dma_area->irb.scsw.cmd.ectl)
return;
/* Copy concurrent sense / model dependent information. */
- memcpy (&cdev->private->irb.ecw, irb->ecw, sizeof (irb->ecw));
+ memcpy (&cdev->private->dma_area->irb.ecw, irb->ecw, sizeof (irb->ecw));
}

/*
@@ -118,7 +118,7 @@ ccw_device_accumulate_esw(struct ccw_device *cdev, struct irb *irb)
if (!ccw_device_accumulate_esw_valid(irb))
return;

- cdev_irb = &cdev->private->irb;
+ cdev_irb = &cdev->private->dma_area->irb;

/* Copy last path used mask. */
cdev_irb->esw.esw1.lpum = irb->esw.esw1.lpum;
@@ -210,7 +210,7 @@ ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb)
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));
+ memcpy(&cdev->private->dma_area->irb, irb, sizeof(struct irb));
return;
}
/*
@@ -219,7 +219,7 @@ ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb)
if (!scsw_is_solicited(&irb->scsw))
return;

- cdev_irb = &cdev->private->irb;
+ cdev_irb = &cdev->private->dma_area->irb;

/*
* If the clear function had been performed, all formerly pending
@@ -227,7 +227,7 @@ ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb)
* intermediate accumulated status to the device driver.
*/
if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
- memset(&cdev->private->irb, 0, sizeof(struct irb));
+ memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));

/* Copy bits which are valid only for the start function. */
if (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) {
@@ -329,9 +329,9 @@ ccw_device_do_sense(struct ccw_device *cdev, struct irb *irb)
/*
* We have ending status but no sense information. Do a basic sense.
*/
- sense_ccw = &to_io_private(sch)->sense_ccw;
+ sense_ccw = &to_io_private(sch)->dma_area->sense_ccw;
sense_ccw->cmd_code = CCW_CMD_BASIC_SENSE;
- sense_ccw->cda = (__u32) __pa(cdev->private->irb.ecw);
+ sense_ccw->cda = (__u32) __pa(cdev->private->dma_area->irb.ecw);
sense_ccw->count = SENSE_MAX_COUNT;
sense_ccw->flags = CCW_FLAG_SLI;

@@ -364,7 +364,7 @@ ccw_device_accumulate_basic_sense(struct ccw_device *cdev, struct irb *irb)

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->dma_area->irb.esw.esw0.erw.cons = 1;
cdev->private->flags.dosense = 0;
}
/* Check if path verification is required. */
@@ -386,7 +386,7 @@ ccw_device_accumulate_and_sense(struct ccw_device *cdev, struct irb *irb)
/* 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->dma_area->irb.esw.esw0.erw.cons = 1;
cdev->private->flags.dosense = 0;
return 0;
}
diff --git a/drivers/s390/cio/io_sch.h b/drivers/s390/cio/io_sch.h
index 90e4e3a7841b..fc3220fede0f 100644
--- a/drivers/s390/cio/io_sch.h
+++ b/drivers/s390/cio/io_sch.h
@@ -9,15 +9,20 @@
#include "css.h"
#include "orb.h"

+
+struct io_subchannel_dma_area {
+ struct ccw1 sense_ccw; /* static ccw for sense command */
+};
+
struct io_subchannel_private {
union orb orb; /* operation request block */
- struct ccw1 sense_ccw; /* static ccw for sense command */
struct ccw_device *cdev;/* pointer to the child ccw device */
struct {
unsigned int suspend:1; /* allow suspend */
unsigned int prefetch:1;/* deny prefetch */
unsigned int inter:1; /* suppress intermediate interrupts */
} __packed options;
+ struct io_subchannel_dma_area *dma_area;
} __aligned(8);

#define to_io_private(n) ((struct io_subchannel_private *) \
@@ -115,6 +120,13 @@ enum cdev_todo {
#define FAKE_CMD_IRB 1
#define FAKE_TM_IRB 2

+struct ccw_device_dma_area {
+ struct senseid senseid; /* SenseID info */
+ struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */
+ struct irb irb; /* device status */
+ struct pgid pgid[8]; /* path group IDs per chpid*/
+};
+
struct ccw_device_private {
struct ccw_device *cdev;
struct subchannel *sch;
@@ -156,11 +168,7 @@ struct ccw_device_private {
} __attribute__((packed)) flags;
unsigned long intparm; /* user interruption parameter */
struct qdio_irq *qdio_data;
- struct irb irb; /* device status */
int async_kill_io_rc;
- struct senseid senseid; /* SenseID info */
- struct pgid pgid[8]; /* path group IDs per chpid*/
- struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */
struct work_struct todo_work;
enum cdev_todo todo;
wait_queue_head_t wait_q;
@@ -169,6 +177,7 @@ struct ccw_device_private {
struct list_head cmb_list; /* list of measured devices */
u64 cmb_start_time; /* clock value of cmb reset */
void *cmb_wait; /* deferred cmb enable/disable */
+ struct ccw_device_dma_area *dma_area;
enum interruption_class int_class;
};

--
2.16.4