#include "chp.h"
int css_init_done = 0;
-static int need_reprobe = 0;
-static int max_ssid = 0;
+int max_ssid;
struct channel_subsystem *channel_subsystems[__MAX_CSSID + 1];
int ret;
struct subchannel *sch;
- sch = css_alloc_subchannel(schid);
- if (IS_ERR(sch))
- return PTR_ERR(sch);
+ if (cio_is_console(schid))
+ sch = cio_get_console_subchannel();
+ else {
+ sch = css_alloc_subchannel(schid);
+ if (IS_ERR(sch))
+ return PTR_ERR(sch);
+ }
ret = css_register_subchannel(sch);
- if (ret)
- put_device(&sch->dev);
+ if (ret) {
+ if (!cio_is_console(schid))
+ put_device(&sch->dev);
+ }
return ret;
}
static struct idset *slow_subchannel_set;
static spinlock_t slow_subchannel_lock;
+static wait_queue_head_t css_eval_wq;
+static atomic_t css_eval_scheduled;
static int __init slow_subchannel_init(void)
{
spin_lock_init(&slow_subchannel_lock);
+ atomic_set(&css_eval_scheduled, 0);
+ init_waitqueue_head(&css_eval_wq);
slow_subchannel_set = idset_sch_new();
if (!slow_subchannel_set) {
CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n");
static void css_slow_path_func(struct work_struct *unused)
{
+ unsigned long flags;
+
CIO_TRACE_EVENT(4, "slowpath");
for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn,
NULL);
+ spin_lock_irqsave(&slow_subchannel_lock, flags);
+ if (idset_is_empty(slow_subchannel_set)) {
+ atomic_set(&css_eval_scheduled, 0);
+ wake_up(&css_eval_wq);
+ }
+ spin_unlock_irqrestore(&slow_subchannel_lock, flags);
}
static DECLARE_WORK(slow_path_work, css_slow_path_func);
spin_lock_irqsave(&slow_subchannel_lock, flags);
idset_sch_add(slow_subchannel_set, schid);
+ atomic_set(&css_eval_scheduled, 1);
queue_work(slow_path_wq, &slow_path_work);
spin_unlock_irqrestore(&slow_subchannel_lock, flags);
}
spin_lock_irqsave(&slow_subchannel_lock, flags);
idset_fill(slow_subchannel_set);
+ atomic_set(&css_eval_scheduled, 1);
queue_work(slow_path_wq, &slow_path_work);
spin_unlock_irqrestore(&slow_subchannel_lock, flags);
}
-void css_wait_for_slow_path(void)
+static int __unset_registered(struct device *dev, void *data)
{
- flush_workqueue(slow_path_wq);
-}
-
-/* Reprobe subchannel if unregistered. */
-static int reprobe_subchannel(struct subchannel_id schid, void *data)
-{
- int ret;
-
- CIO_MSG_EVENT(6, "cio: reprobe 0.%x.%04x\n",
- schid.ssid, schid.sch_no);
- if (need_reprobe)
- return -EAGAIN;
-
- ret = css_probe_device(schid);
- switch (ret) {
- case 0:
- break;
- case -ENXIO:
- case -ENOMEM:
- case -EIO:
- /* These should abort looping */
- break;
- default:
- ret = 0;
- }
-
- return ret;
-}
+ struct idset *set = data;
+ struct subchannel *sch = to_subchannel(dev);
-static void reprobe_after_idle(struct work_struct *unused)
-{
- /* Make sure initial subchannel scan is done. */
- wait_event(ccw_device_init_wq,
- atomic_read(&ccw_device_init_count) == 0);
- if (need_reprobe)
- css_schedule_reprobe();
+ idset_sch_del(set, sch->schid);
+ return 0;
}
-static DECLARE_WORK(reprobe_idle_work, reprobe_after_idle);
-
-/* Work function used to reprobe all unregistered subchannels. */
-static void reprobe_all(struct work_struct *unused)
+void css_schedule_eval_all_unreg(void)
{
- int ret;
-
- CIO_MSG_EVENT(4, "reprobe start\n");
+ unsigned long flags;
+ struct idset *unreg_set;
- /* Make sure initial subchannel scan is done. */
- if (atomic_read(&ccw_device_init_count) != 0) {
- queue_work(ccw_device_work, &reprobe_idle_work);
+ /* Find unregistered subchannels. */
+ unreg_set = idset_sch_new();
+ if (!unreg_set) {
+ /* Fallback. */
+ css_schedule_eval_all();
return;
}
- need_reprobe = 0;
- ret = for_each_subchannel_staged(NULL, reprobe_subchannel, NULL);
-
- CIO_MSG_EVENT(4, "reprobe done (rc=%d, need_reprobe=%d)\n", ret,
- need_reprobe);
+ idset_fill(unreg_set);
+ bus_for_each_dev(&css_bus_type, NULL, unreg_set, __unset_registered);
+ /* Apply to slow_subchannel_set. */
+ spin_lock_irqsave(&slow_subchannel_lock, flags);
+ idset_add_set(slow_subchannel_set, unreg_set);
+ atomic_set(&css_eval_scheduled, 1);
+ queue_work(slow_path_wq, &slow_path_work);
+ spin_unlock_irqrestore(&slow_subchannel_lock, flags);
+ idset_free(unreg_set);
}
-static DECLARE_WORK(css_reprobe_work, reprobe_all);
+void css_wait_for_slow_path(void)
+{
+ flush_workqueue(slow_path_wq);
+}
/* Schedule reprobing of all unregistered subchannels. */
void css_schedule_reprobe(void)
{
- need_reprobe = 1;
- queue_work(slow_path_wq, &css_reprobe_work);
+ css_schedule_eval_all_unreg();
}
-
EXPORT_SYMBOL_GPL(css_schedule_reprobe);
/*
css_evaluate_subchannel(mchk_schid, 0);
}
-static int __init
-__init_channel_subsystem(struct subchannel_id schid, void *data)
-{
- struct subchannel *sch;
- int ret;
-
- if (cio_is_console(schid))
- sch = cio_get_console_subchannel();
- else {
- sch = css_alloc_subchannel(schid);
- if (IS_ERR(sch))
- ret = PTR_ERR(sch);
- else
- ret = 0;
- switch (ret) {
- case 0:
- break;
- case -ENOMEM:
- panic("Out of memory in init_channel_subsystem\n");
- /* -ENXIO: no more subchannels. */
- case -ENXIO:
- return ret;
- /* -EIO: this subchannel set not supported. */
- case -EIO:
- return ret;
- default:
- return 0;
- }
- }
- /*
- * We register ALL valid subchannels in ioinfo, even those
- * that have been present before init_channel_subsystem.
- * These subchannels can't have been registered yet (kmalloc
- * not working) so we do it now. This is true e.g. for the
- * console subchannel.
- */
- if (css_register_subchannel(sch)) {
- if (!cio_is_console(schid))
- put_device(&sch->dev);
- }
- return 0;
-}
-
static void __init
css_generate_pgid(struct channel_subsystem *css, u32 tod_high)
{
* The struct subchannel's are created during probing (except for the
* static console subchannel).
*/
-static int __init
-init_channel_subsystem (void)
+static int __init css_bus_init(void)
{
int ret, i;
ret = chsc_determine_css_characteristics();
if (ret == -ENOMEM)
- goto out; /* No need to continue. */
+ goto out;
ret = chsc_alloc_sei_area();
if (ret)
goto out;
+ /* Try to enable MSS. */
+ ret = chsc_enable_facility(CHSC_SDA_OC_MSS);
+ switch (ret) {
+ case 0: /* Success. */
+ max_ssid = __MAX_SSID;
+ break;
+ case -ENOMEM:
+ goto out;
+ default:
+ max_ssid = 0;
+ }
+
ret = slow_subchannel_init();
if (ret)
goto out;
if ((ret = bus_register(&css_bus_type)))
goto out;
- /* Try to enable MSS. */
- ret = chsc_enable_facility(CHSC_SDA_OC_MSS);
- switch (ret) {
- case 0: /* Success. */
- max_ssid = __MAX_SSID;
- break;
- case -ENOMEM:
- goto out_bus;
- default:
- max_ssid = 0;
- }
/* Setup css structure. */
for (i = 0; i <= __MAX_CSSID; i++) {
struct channel_subsystem *css;
/* Enable default isc for I/O subchannels. */
isc_register(IO_SCH_ISC);
- for_each_subchannel(__init_channel_subsystem, NULL);
return 0;
out_file:
if (css_chsc_characteristics.secm)
&dev_attr_cm_enable);
device_unregister(&css->device);
}
-out_bus:
bus_unregister(&css_bus_type);
out:
crw_unregister_handler(CRW_RSC_CSS);
chsc_free_sei_area();
- kfree(slow_subchannel_set);
+ idset_free(slow_subchannel_set);
pr_alert("The CSS device driver initialization failed with "
"errno=%d\n", ret);
return ret;
}
+static void __init css_bus_cleanup(void)
+{
+ struct channel_subsystem *css;
+ int i;
+
+ for (i = 0; i <= __MAX_CSSID; i++) {
+ css = channel_subsystems[i];
+ device_unregister(&css->pseudo_subchannel->dev);
+ css->pseudo_subchannel = NULL;
+ if (css_chsc_characteristics.secm)
+ device_remove_file(&css->device, &dev_attr_cm_enable);
+ device_unregister(&css->device);
+ }
+ bus_unregister(&css_bus_type);
+ crw_unregister_handler(CRW_RSC_CSS);
+ chsc_free_sei_area();
+ idset_free(slow_subchannel_set);
+ isc_unregister(IO_SCH_ISC);
+}
+
+static int __init channel_subsystem_init(void)
+{
+ int ret;
+
+ ret = css_bus_init();
+ if (ret)
+ return ret;
+
+ ret = io_subchannel_init();
+ if (ret)
+ css_bus_cleanup();
+
+ return ret;
+}
+subsys_initcall(channel_subsystem_init);
+
+static int css_settle(struct device_driver *drv, void *unused)
+{
+ struct css_driver *cssdrv = to_cssdriver(drv);
+
+ if (cssdrv->settle)
+ cssdrv->settle();
+ return 0;
+}
+
+/*
+ * Wait for the initialization of devices to finish, to make sure we are
+ * done with our setup if the search for the root device starts.
+ */
+static int __init channel_subsystem_init_sync(void)
+{
+ /* Start initial subchannel evaluation. */
+ css_schedule_eval_all();
+ /* Wait for the evaluation of subchannels to finish. */
+ wait_event(css_eval_wq, atomic_read(&css_eval_scheduled) == 0);
+ /* Wait for the subchannel type specific initialization to finish */
+ return bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle);
+}
+subsys_initcall_sync(channel_subsystem_init_sync);
+
int sch_is_pseudo_sch(struct subchannel *sch)
{
return sch == to_css(sch->dev.parent)->pseudo_subchannel;
}
EXPORT_SYMBOL_GPL(css_driver_unregister);
-subsys_initcall(init_channel_subsystem);
-
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(css_bus_type);
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blobdiff