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path: root/drivers/s390/cio/css.c
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Diffstat (limited to 'drivers/s390/cio/css.c')
-rw-r--r--drivers/s390/cio/css.c69
1 files changed, 38 insertions, 31 deletions
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 7e4d57b4266f..5137dafd1e8d 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -33,7 +33,7 @@ struct device css_bus_device = {
};
static struct subchannel *
-css_alloc_subchannel(int irq)
+css_alloc_subchannel(struct subchannel_id schid)
{
struct subchannel *sch;
int ret;
@@ -41,13 +41,11 @@ css_alloc_subchannel(int irq)
sch = kmalloc (sizeof (*sch), GFP_KERNEL | GFP_DMA);
if (sch == NULL)
return ERR_PTR(-ENOMEM);
- ret = cio_validate_subchannel (sch, irq);
+ ret = cio_validate_subchannel (sch, schid);
if (ret < 0) {
kfree(sch);
return ERR_PTR(ret);
}
- if (irq > highest_subchannel)
- highest_subchannel = irq;
if (sch->st != SUBCHANNEL_TYPE_IO) {
/* For now we ignore all non-io subchannels. */
@@ -87,7 +85,7 @@ css_subchannel_release(struct device *dev)
struct subchannel *sch;
sch = to_subchannel(dev);
- if (!cio_is_console(sch->irq))
+ if (!cio_is_console(sch->schid))
kfree(sch);
}
@@ -114,12 +112,12 @@ css_register_subchannel(struct subchannel *sch)
}
int
-css_probe_device(int irq)
+css_probe_device(struct subchannel_id schid)
{
int ret;
struct subchannel *sch;
- sch = css_alloc_subchannel(irq);
+ sch = css_alloc_subchannel(schid);
if (IS_ERR(sch))
return PTR_ERR(sch);
ret = css_register_subchannel(sch);
@@ -132,26 +130,26 @@ static int
check_subchannel(struct device * dev, void * data)
{
struct subchannel *sch;
- int irq = (unsigned long)data;
+ struct subchannel_id *schid = data;
sch = to_subchannel(dev);
- return (sch->irq == irq);
+ return schid_equal(&sch->schid, schid);
}
struct subchannel *
-get_subchannel_by_schid(int irq)
+get_subchannel_by_schid(struct subchannel_id schid)
{
struct device *dev;
dev = bus_find_device(&css_bus_type, NULL,
- (void *)(unsigned long)irq, check_subchannel);
+ (void *)&schid, check_subchannel);
return dev ? to_subchannel(dev) : NULL;
}
static inline int
-css_get_subchannel_status(struct subchannel *sch, int schid)
+css_get_subchannel_status(struct subchannel *sch, struct subchannel_id schid)
{
struct schib schib;
int cc;
@@ -170,13 +168,13 @@ css_get_subchannel_status(struct subchannel *sch, int schid)
}
static int
-css_evaluate_subchannel(int irq, int slow)
+css_evaluate_subchannel(struct subchannel_id schid, int slow)
{
int event, ret, disc;
struct subchannel *sch;
unsigned long flags;
- sch = get_subchannel_by_schid(irq);
+ sch = get_subchannel_by_schid(schid);
disc = sch ? device_is_disconnected(sch) : 0;
if (disc && slow) {
if (sch)
@@ -194,9 +192,10 @@ css_evaluate_subchannel(int irq, int slow)
put_device(&sch->dev);
return -EAGAIN; /* Will be done on the slow path. */
}
- event = css_get_subchannel_status(sch, irq);
+ event = css_get_subchannel_status(sch, schid);
CIO_MSG_EVENT(4, "Evaluating schid %04x, event %d, %s, %s path.\n",
- irq, event, sch?(disc?"disconnected":"normal"):"unknown",
+ schid.sch_no, event,
+ sch?(disc?"disconnected":"normal"):"unknown",
slow?"slow":"fast");
switch (event) {
case CIO_NO_PATH:
@@ -253,7 +252,7 @@ css_evaluate_subchannel(int irq, int slow)
sch->schib.pmcw.intparm = 0;
cio_modify(sch);
put_device(&sch->dev);
- ret = css_probe_device(irq);
+ ret = css_probe_device(schid);
} else {
/*
* We can't immediately deregister the disconnected
@@ -272,7 +271,7 @@ css_evaluate_subchannel(int irq, int slow)
device_trigger_reprobe(sch);
spin_unlock_irqrestore(&sch->lock, flags);
}
- ret = sch ? 0 : css_probe_device(irq);
+ ret = sch ? 0 : css_probe_device(schid);
break;
default:
BUG();
@@ -284,10 +283,12 @@ css_evaluate_subchannel(int irq, int slow)
static void
css_rescan_devices(void)
{
- int irq, ret;
+ int ret;
+ struct subchannel_id schid;
- for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
- ret = css_evaluate_subchannel(irq, 1);
+ init_subchannel_id(&schid);
+ do {
+ ret = css_evaluate_subchannel(schid, 1);
/* No more memory. It doesn't make sense to continue. No
* panic because this can happen in midflight and just
* because we can't use a new device is no reason to crash
@@ -297,12 +298,12 @@ css_rescan_devices(void)
/* -ENXIO indicates that there are no more subchannels. */
if (ret == -ENXIO)
break;
- }
+ } while (schid.sch_no++ < __MAX_SUBCHANNEL);
}
struct slow_subchannel {
struct list_head slow_list;
- unsigned long schid;
+ struct subchannel_id schid;
};
static LIST_HEAD(slow_subchannels_head);
@@ -357,20 +358,24 @@ int
css_process_crw(int irq)
{
int ret;
+ struct subchannel_id mchk_schid;
CIO_CRW_EVENT(2, "source is subchannel %04X\n", irq);
if (need_rescan)
/* We need to iterate all subchannels anyway. */
return -EAGAIN;
+
+ init_subchannel_id(&mchk_schid);
+ mchk_schid.sch_no = irq;
/*
* Since we are always presented with IPI in the CRW, we have to
* use stsch() to find out if the subchannel in question has come
* or gone.
*/
- ret = css_evaluate_subchannel(irq, 0);
+ ret = css_evaluate_subchannel(mchk_schid, 0);
if (ret == -EAGAIN) {
- if (css_enqueue_subchannel_slow(irq)) {
+ if (css_enqueue_subchannel_slow(mchk_schid)) {
css_clear_subchannel_slow_list();
need_rescan = 1;
}
@@ -404,7 +409,8 @@ css_generate_pgid(void)
static int __init
init_channel_subsystem (void)
{
- int ret, irq;
+ int ret;
+ struct subchannel_id schid;
if (chsc_determine_css_characteristics() == 0)
css_characteristics_avail = 1;
@@ -420,13 +426,14 @@ init_channel_subsystem (void)
ctl_set_bit(6, 28);
- for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
+ init_subchannel_id(&schid);
+ do {
struct subchannel *sch;
- if (cio_is_console(irq))
+ if (cio_is_console(schid))
sch = cio_get_console_subchannel();
else {
- sch = css_alloc_subchannel(irq);
+ sch = css_alloc_subchannel(schid);
if (IS_ERR(sch))
ret = PTR_ERR(sch);
else
@@ -448,7 +455,7 @@ init_channel_subsystem (void)
* console subchannel.
*/
css_register_subchannel(sch);
- }
+ } while (schid.sch_no++ < __MAX_SUBCHANNEL);
return 0;
out_bus:
@@ -482,7 +489,7 @@ struct bus_type css_bus_type = {
subsys_initcall(init_channel_subsystem);
int
-css_enqueue_subchannel_slow(unsigned long schid)
+css_enqueue_subchannel_slow(struct subchannel_id schid)
{
struct slow_subchannel *new_slow_sch;
unsigned long flags;
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-12 20:30:45 +0000