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Diffstat (limited to 'drivers/s390/cio/css.c')
-rw-r--r--drivers/s390/cio/css.c112
1 files changed, 56 insertions, 56 deletions
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index c7db95398500..4c85df7a548e 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -8,8 +8,7 @@
* Cornelia Huck (cornelia.huck@de.ibm.com)
*/
-#define KMSG_COMPONENT "cio"
-#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+#define pr_fmt(fmt) "cio: " fmt
#include <linux/export.h>
#include <linux/init.h>
@@ -39,7 +38,7 @@ int max_ssid;
#define MAX_CSS_IDX 0
struct channel_subsystem *channel_subsystems[MAX_CSS_IDX + 1];
-static struct bus_type css_bus_type;
+static const struct bus_type css_bus_type;
int
for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data)
@@ -148,16 +147,10 @@ out:
static void css_sch_todo(struct work_struct *work);
-static int css_sch_create_locks(struct subchannel *sch)
+static void css_sch_create_locks(struct subchannel *sch)
{
- sch->lock = kmalloc(sizeof(*sch->lock), GFP_KERNEL);
- if (!sch->lock)
- return -ENOMEM;
-
- spin_lock_init(sch->lock);
+ spin_lock_init(&sch->lock);
mutex_init(&sch->reg_mutex);
-
- return 0;
}
static void css_subchannel_release(struct device *dev)
@@ -167,7 +160,6 @@ static void css_subchannel_release(struct device *dev)
sch->config.intparm = 0;
cio_commit_config(sch);
kfree(sch->driver_override);
- kfree(sch->lock);
kfree(sch);
}
@@ -219,9 +211,7 @@ struct subchannel *css_alloc_subchannel(struct subchannel_id schid,
sch->schib = *schib;
sch->st = schib->pmcw.st;
- ret = css_sch_create_locks(sch);
- if (ret)
- goto err;
+ css_sch_create_locks(sch);
INIT_WORK(&sch->todo_work, css_sch_todo);
sch->dev.release = &css_subchannel_release;
@@ -318,7 +308,7 @@ static ssize_t type_show(struct device *dev, struct device_attribute *attr,
{
struct subchannel *sch = to_subchannel(dev);
- return sprintf(buf, "%01x\n", sch->st);
+ return sysfs_emit(buf, "%01x\n", sch->st);
}
static DEVICE_ATTR_RO(type);
@@ -328,7 +318,7 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
{
struct subchannel *sch = to_subchannel(dev);
- return sprintf(buf, "css:t%01X\n", sch->st);
+ return sysfs_emit(buf, "css:t%01X\n", sch->st);
}
static DEVICE_ATTR_RO(modalias);
@@ -354,7 +344,7 @@ static ssize_t driver_override_show(struct device *dev,
ssize_t len;
device_lock(dev);
- len = snprintf(buf, PAGE_SIZE, "%s\n", sch->driver_override);
+ len = sysfs_emit(buf, "%s\n", sch->driver_override);
device_unlock(dev);
return len;
}
@@ -389,11 +379,11 @@ static ssize_t chpids_show(struct device *dev,
for (chp = 0; chp < 8; chp++) {
mask = 0x80 >> chp;
if (ssd->path_mask & mask)
- ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id);
+ ret += sysfs_emit_at(buf, ret, "%02x ", ssd->chpid[chp].id);
else
- ret += sprintf(buf + ret, "00 ");
+ ret += sysfs_emit_at(buf, ret, "00 ");
}
- ret += sprintf(buf + ret, "\n");
+ ret += sysfs_emit_at(buf, ret, "\n");
return ret;
}
static DEVICE_ATTR_RO(chpids);
@@ -405,8 +395,8 @@ static ssize_t pimpampom_show(struct device *dev,
struct subchannel *sch = to_subchannel(dev);
struct pmcw *pmcw = &sch->schib.pmcw;
- return sprintf(buf, "%02x %02x %02x\n",
- pmcw->pim, pmcw->pam, pmcw->pom);
+ return sysfs_emit(buf, "%02x %02x %02x\n",
+ pmcw->pim, pmcw->pam, pmcw->pom);
}
static DEVICE_ATTR_RO(pimpampom);
@@ -602,12 +592,12 @@ static void css_sch_todo(struct work_struct *work)
sch = container_of(work, struct subchannel, todo_work);
/* Find out todo. */
- spin_lock_irq(sch->lock);
+ spin_lock_irq(&sch->lock);
todo = sch->todo;
CIO_MSG_EVENT(4, "sch_todo: sch=0.%x.%04x, todo=%d\n", sch->schid.ssid,
sch->schid.sch_no, todo);
sch->todo = SCH_TODO_NOTHING;
- spin_unlock_irq(sch->lock);
+ spin_unlock_irq(&sch->lock);
/* Perform todo. */
switch (todo) {
case SCH_TODO_NOTHING:
@@ -615,9 +605,9 @@ static void css_sch_todo(struct work_struct *work)
case SCH_TODO_EVAL:
ret = css_evaluate_known_subchannel(sch, 1);
if (ret == -EAGAIN) {
- spin_lock_irq(sch->lock);
+ spin_lock_irq(&sch->lock);
css_sched_sch_todo(sch, todo);
- spin_unlock_irq(sch->lock);
+ spin_unlock_irq(&sch->lock);
}
break;
case SCH_TODO_UNREG:
@@ -740,12 +730,21 @@ void css_schedule_eval_all(void)
spin_unlock_irqrestore(&slow_subchannel_lock, flags);
}
-static int __unset_registered(struct device *dev, void *data)
+static int __unset_validpath(struct device *dev, void *data)
{
struct idset *set = data;
struct subchannel *sch = to_subchannel(dev);
+ struct pmcw *pmcw = &sch->schib.pmcw;
+
+ /* Here we want to make sure that we are considering only those subchannels
+ * which do not have an operational device attached to it. This can be found
+ * with the help of PAM and POM values of pmcw. OPM provides the information
+ * about any path which is currently vary-off, so that we should not consider.
+ */
+ if (sch->st == SUBCHANNEL_TYPE_IO &&
+ (sch->opm & pmcw->pam & pmcw->pom))
+ idset_sch_del(set, sch->schid);
- idset_sch_del(set, sch->schid);
return 0;
}
@@ -774,8 +773,8 @@ void css_schedule_eval_cond(enum css_eval_cond cond, unsigned long delay)
}
idset_fill(set);
switch (cond) {
- case CSS_EVAL_UNREG:
- bus_for_each_dev(&css_bus_type, NULL, set, __unset_registered);
+ case CSS_EVAL_NO_PATH:
+ bus_for_each_dev(&css_bus_type, NULL, set, __unset_validpath);
break;
case CSS_EVAL_NOT_ONLINE:
bus_for_each_dev(&css_bus_type, NULL, set, __unset_online);
@@ -798,11 +797,11 @@ void css_wait_for_slow_path(void)
flush_workqueue(cio_work_q);
}
-/* Schedule reprobing of all unregistered subchannels. */
+/* Schedule reprobing of all subchannels with no valid operational path. */
void css_schedule_reprobe(void)
{
/* Schedule with a delay to allow merging of subsequent calls. */
- css_schedule_eval_cond(CSS_EVAL_UNREG, 1 * HZ);
+ css_schedule_eval_cond(CSS_EVAL_NO_PATH, 1 * HZ);
}
EXPORT_SYMBOL_GPL(css_schedule_reprobe);
@@ -881,7 +880,7 @@ static ssize_t real_cssid_show(struct device *dev, struct device_attribute *a,
if (!css->id_valid)
return -EINVAL;
- return sprintf(buf, "%x\n", css->cssid);
+ return sysfs_emit(buf, "%x\n", css->cssid);
}
static DEVICE_ATTR_RO(real_cssid);
@@ -904,7 +903,7 @@ static ssize_t cm_enable_show(struct device *dev, struct device_attribute *a,
int ret;
mutex_lock(&css->mutex);
- ret = sprintf(buf, "%x\n", css->cm_enabled);
+ ret = sysfs_emit(buf, "%x\n", css->cm_enabled);
mutex_unlock(&css->mutex);
return ret;
}
@@ -1017,12 +1016,7 @@ static int __init setup_css(int nr)
css->pseudo_subchannel->dev.parent = &css->device;
css->pseudo_subchannel->dev.release = css_subchannel_release;
mutex_init(&css->pseudo_subchannel->reg_mutex);
- ret = css_sch_create_locks(css->pseudo_subchannel);
- if (ret) {
- kfree(css->pseudo_subchannel);
- device_unregister(&css->device);
- goto out_err;
- }
+ css_sch_create_locks(css->pseudo_subchannel);
dev_set_name(&css->pseudo_subchannel->dev, "defunct");
ret = device_register(&css->pseudo_subchannel->dev);
@@ -1119,26 +1113,33 @@ static int cio_dma_pool_init(void)
return 0;
}
-void *cio_gp_dma_zalloc(struct gen_pool *gp_dma, struct device *dma_dev,
- size_t size)
+void *__cio_gp_dma_zalloc(struct gen_pool *gp_dma, struct device *dma_dev,
+ size_t size, dma32_t *dma_handle)
{
dma_addr_t dma_addr;
- unsigned long addr;
size_t chunk_size;
+ void *addr;
if (!gp_dma)
return NULL;
- addr = gen_pool_alloc(gp_dma, size);
+ addr = gen_pool_dma_alloc(gp_dma, size, &dma_addr);
while (!addr) {
chunk_size = round_up(size, PAGE_SIZE);
- addr = (unsigned long) dma_alloc_coherent(dma_dev,
- chunk_size, &dma_addr, CIO_DMA_GFP);
+ addr = dma_alloc_coherent(dma_dev, chunk_size, &dma_addr, CIO_DMA_GFP);
if (!addr)
return NULL;
- gen_pool_add_virt(gp_dma, addr, dma_addr, chunk_size, -1);
- addr = gen_pool_alloc(gp_dma, size);
+ gen_pool_add_virt(gp_dma, (unsigned long)addr, dma_addr, chunk_size, -1);
+ addr = gen_pool_dma_alloc(gp_dma, size, dma_handle ? &dma_addr : NULL);
}
- return (void *) addr;
+ if (dma_handle)
+ *dma_handle = (__force dma32_t)dma_addr;
+ return addr;
+}
+
+void *cio_gp_dma_zalloc(struct gen_pool *gp_dma, struct device *dma_dev,
+ size_t size)
+{
+ return __cio_gp_dma_zalloc(gp_dma, dma_dev, size, NULL);
}
void cio_gp_dma_free(struct gen_pool *gp_dma, void *cpu_addr, size_t size)
@@ -1330,7 +1331,6 @@ static ssize_t cio_settle_write(struct file *file, const char __user *buf,
static const struct proc_ops cio_settle_proc_ops = {
.proc_open = nonseekable_open,
.proc_write = cio_settle_write,
- .proc_lseek = no_llseek,
};
static int __init cio_settle_init(void)
@@ -1352,10 +1352,10 @@ int sch_is_pseudo_sch(struct subchannel *sch)
return sch == to_css(sch->dev.parent)->pseudo_subchannel;
}
-static int css_bus_match(struct device *dev, struct device_driver *drv)
+static int css_bus_match(struct device *dev, const struct device_driver *drv)
{
struct subchannel *sch = to_subchannel(dev);
- struct css_driver *driver = to_cssdriver(drv);
+ const struct css_driver *driver = to_cssdriver(drv);
struct css_device_id *id;
/* When driver_override is set, only bind to the matching driver */
@@ -1402,9 +1402,9 @@ static void css_shutdown(struct device *dev)
sch->driver->shutdown(sch);
}
-static int css_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int css_uevent(const struct device *dev, struct kobj_uevent_env *env)
{
- struct subchannel *sch = to_subchannel(dev);
+ const struct subchannel *sch = to_subchannel(dev);
int ret;
ret = add_uevent_var(env, "ST=%01X", sch->st);
@@ -1414,7 +1414,7 @@ static int css_uevent(struct device *dev, struct kobj_uevent_env *env)
return ret;
}
-static struct bus_type css_bus_type = {
+static const struct bus_type css_bus_type = {
.name = "css",
.match = css_bus_match,
.probe = css_probe,
generated by cgit (git 2.34.1) at 2025-12-21 19:11:37 +0000