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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.c82
1 files changed, 59 insertions, 23 deletions
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 9263a0fb3858..aea502922646 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -25,6 +25,7 @@
#include "css.h"
#include "cio.h"
+#include "blacklist.h"
#include "cio_debug.h"
#include "ioasm.h"
#include "chsc.h"
@@ -168,18 +169,53 @@ static void css_subchannel_release(struct device *dev)
kfree(sch);
}
-struct subchannel *css_alloc_subchannel(struct subchannel_id schid)
+static int css_validate_subchannel(struct subchannel_id schid,
+ struct schib *schib)
+{
+ int err;
+
+ switch (schib->pmcw.st) {
+ case SUBCHANNEL_TYPE_IO:
+ case SUBCHANNEL_TYPE_MSG:
+ if (!css_sch_is_valid(schib))
+ err = -ENODEV;
+ else if (is_blacklisted(schid.ssid, schib->pmcw.dev)) {
+ CIO_MSG_EVENT(6, "Blacklisted device detected "
+ "at devno %04X, subchannel set %x\n",
+ schib->pmcw.dev, schid.ssid);
+ err = -ENODEV;
+ } else
+ err = 0;
+ break;
+ default:
+ err = 0;
+ }
+ if (err)
+ goto out;
+
+ CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
+ schid.ssid, schid.sch_no, schib->pmcw.st);
+out:
+ return err;
+}
+
+struct subchannel *css_alloc_subchannel(struct subchannel_id schid,
+ struct schib *schib)
{
struct subchannel *sch;
int ret;
+ ret = css_validate_subchannel(schid, schib);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
sch = kzalloc(sizeof(*sch), GFP_KERNEL | GFP_DMA);
if (!sch)
return ERR_PTR(-ENOMEM);
- ret = cio_validate_subchannel(sch, schid);
- if (ret < 0)
- goto err;
+ sch->schid = schid;
+ sch->schib = *schib;
+ sch->st = schib->pmcw.st;
ret = css_sch_create_locks(sch);
if (ret)
@@ -244,8 +280,7 @@ static void ssd_register_chpids(struct chsc_ssd_info *ssd)
for (i = 0; i < 8; i++) {
mask = 0x80 >> i;
if (ssd->path_mask & mask)
- if (!chp_is_registered(ssd->chpid[i]))
- chp_new(ssd->chpid[i]);
+ chp_new(ssd->chpid[i]);
}
}
@@ -382,12 +417,12 @@ int css_register_subchannel(struct subchannel *sch)
return ret;
}
-static int css_probe_device(struct subchannel_id schid)
+static int css_probe_device(struct subchannel_id schid, struct schib *schib)
{
struct subchannel *sch;
int ret;
- sch = css_alloc_subchannel(schid);
+ sch = css_alloc_subchannel(schid, schib);
if (IS_ERR(sch))
return PTR_ERR(sch);
@@ -436,23 +471,23 @@ EXPORT_SYMBOL_GPL(css_sch_is_valid);
static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow)
{
struct schib schib;
+ int ccode;
if (!slow) {
/* Will be done on the slow path. */
return -EAGAIN;
}
- if (stsch(schid, &schib)) {
- /* Subchannel is not provided. */
- return -ENXIO;
- }
- if (!css_sch_is_valid(&schib)) {
- /* Unusable - ignore. */
- return 0;
- }
- CIO_MSG_EVENT(4, "event: sch 0.%x.%04x, new\n", schid.ssid,
- schid.sch_no);
+ /*
+ * The first subchannel that is not-operational (ccode==3)
+ * indicates that there aren't any more devices available.
+ * If stsch gets an exception, it means the current subchannel set
+ * is not valid.
+ */
+ ccode = stsch(schid, &schib);
+ if (ccode)
+ return (ccode == 3) ? -ENXIO : ccode;
- return css_probe_device(schid);
+ return css_probe_device(schid, &schib);
}
static int css_evaluate_known_subchannel(struct subchannel *sch, int slow)
@@ -1081,6 +1116,11 @@ static int __init channel_subsystem_init(void)
if (ret)
goto out_wq;
+ /* Register subchannels which are already in use. */
+ cio_register_early_subchannels();
+ /* Start initial subchannel evaluation. */
+ css_schedule_eval_all();
+
return ret;
out_wq:
destroy_workqueue(cio_work_q);
@@ -1120,10 +1160,6 @@ int css_complete_work(void)
*/
static int __init channel_subsystem_init_sync(void)
{
- /* Register subchannels which are already in use. */
- cio_register_early_subchannels();
- /* Start initial subchannel evaluation. */
- css_schedule_eval_all();
css_complete_work();
return 0;
}