#include "ioasm.h"
#include "chsc.h"
#include "device.h"
+#include "idset.h"
+#include "chp.h"
-int need_rescan = 0;
int css_init_done = 0;
static int need_reprobe = 0;
static int max_ssid = 0;
int css_characteristics_avail = 0;
-inline int
+int
for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data)
{
struct subchannel_id schid;
}
}
-extern int css_get_ssd_info(struct subchannel *sch);
-
-
int css_sch_device_register(struct subchannel *sch)
{
int ret;
mutex_unlock(&sch->reg_mutex);
}
-static int
-css_register_subchannel(struct subchannel *sch)
+static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw)
+{
+ int i;
+ int mask;
+
+ memset(ssd, 0, sizeof(struct chsc_ssd_info));
+ ssd->path_mask = pmcw->pim;
+ for (i = 0; i < 8; i++) {
+ mask = 0x80 >> i;
+ if (pmcw->pim & mask) {
+ chp_id_init(&ssd->chpid[i]);
+ ssd->chpid[i].id = pmcw->chpid[i];
+ }
+ }
+}
+
+static void ssd_register_chpids(struct chsc_ssd_info *ssd)
+{
+ int i;
+ int mask;
+
+ 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]);
+ }
+}
+
+void css_update_ssd_info(struct subchannel *sch)
+{
+ int ret;
+
+ if (cio_is_console(sch->schid)) {
+ /* Console is initialized too early for functions requiring
+ * memory allocation. */
+ ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw);
+ } else {
+ ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info);
+ if (ret)
+ ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw);
+ ssd_register_chpids(&sch->ssd_info);
+ }
+}
+
+static int css_register_subchannel(struct subchannel *sch)
{
int ret;
sch->dev.bus = &css_bus_type;
sch->dev.release = &css_subchannel_release;
sch->dev.groups = subch_attr_groups;
-
- css_get_ssd_info(sch);
-
+ css_update_ssd_info(sch);
/* make it known to the system */
ret = css_sch_device_register(sch);
if (ret) {
return dev ? to_subchannel(dev) : NULL;
}
-static inline int css_get_subchannel_status(struct subchannel *sch)
+static int css_get_subchannel_status(struct subchannel *sch)
{
struct schib schib;
/* Will be done on the slow path. */
return -EAGAIN;
}
- if (stsch(schid, &schib) || !schib.pmcw.dnv) {
+ if (stsch_err(schid, &schib) || !schib.pmcw.dnv) {
/* Unusable - ignore. */
return 0;
}
return css_probe_device(schid);
}
-static int css_evaluate_subchannel(struct subchannel_id schid, int slow)
+static void css_evaluate_subchannel(struct subchannel_id schid, int slow)
{
struct subchannel *sch;
int ret;
put_device(&sch->dev);
} else
ret = css_evaluate_new_subchannel(schid, slow);
-
- return ret;
+ if (ret == -EAGAIN)
+ css_schedule_eval(schid);
}
-static int
-css_rescan_devices(struct subchannel_id schid, void *data)
+static struct idset *slow_subchannel_set;
+static spinlock_t slow_subchannel_lock;
+
+static int __init slow_subchannel_init(void)
{
- return css_evaluate_subchannel(schid, 1);
+ spin_lock_init(&slow_subchannel_lock);
+ slow_subchannel_set = idset_sch_new();
+ if (!slow_subchannel_set) {
+ printk(KERN_WARNING "cio: could not allocate slow subchannel "
+ "set\n");
+ return -ENOMEM;
+ }
+ return 0;
}
-struct slow_subchannel {
- struct list_head slow_list;
- struct subchannel_id schid;
-};
-
-static LIST_HEAD(slow_subchannels_head);
-static DEFINE_SPINLOCK(slow_subchannel_lock);
+subsys_initcall(slow_subchannel_init);
-static void
-css_trigger_slow_path(struct work_struct *unused)
+static void css_slow_path_func(struct work_struct *unused)
{
- CIO_TRACE_EVENT(4, "slowpath");
-
- if (need_rescan) {
- need_rescan = 0;
- for_each_subchannel(css_rescan_devices, NULL);
- return;
- }
+ struct subchannel_id schid;
+ CIO_TRACE_EVENT(4, "slowpath");
spin_lock_irq(&slow_subchannel_lock);
- while (!list_empty(&slow_subchannels_head)) {
- struct slow_subchannel *slow_sch =
- list_entry(slow_subchannels_head.next,
- struct slow_subchannel, slow_list);
-
- list_del_init(slow_subchannels_head.next);
+ init_subchannel_id(&schid);
+ while (idset_sch_get_first(slow_subchannel_set, &schid)) {
+ idset_sch_del(slow_subchannel_set, schid);
spin_unlock_irq(&slow_subchannel_lock);
- css_evaluate_subchannel(slow_sch->schid, 1);
+ css_evaluate_subchannel(schid, 1);
spin_lock_irq(&slow_subchannel_lock);
- kfree(slow_sch);
}
spin_unlock_irq(&slow_subchannel_lock);
}
-DECLARE_WORK(slow_path_work, css_trigger_slow_path);
+static DECLARE_WORK(slow_path_work, css_slow_path_func);
struct workqueue_struct *slow_path_wq;
+void css_schedule_eval(struct subchannel_id schid)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&slow_subchannel_lock, flags);
+ idset_sch_add(slow_subchannel_set, schid);
+ queue_work(slow_path_wq, &slow_path_work);
+ spin_unlock_irqrestore(&slow_subchannel_lock, flags);
+}
+
+void css_schedule_eval_all(void)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&slow_subchannel_lock, flags);
+ idset_fill(slow_subchannel_set);
+ queue_work(slow_path_wq, &slow_path_work);
+ spin_unlock_irqrestore(&slow_subchannel_lock, flags);
+}
+
/* Reprobe subchannel if unregistered. */
static int reprobe_subchannel(struct subchannel_id schid, void *data)
{
need_reprobe);
}
-DECLARE_WORK(css_reprobe_work, reprobe_all);
+static DECLARE_WORK(css_reprobe_work, reprobe_all);
/* Schedule reprobing of all unregistered subchannels. */
void css_schedule_reprobe(void)
EXPORT_SYMBOL_GPL(css_schedule_reprobe);
-/*
- * Rescan for new devices. FIXME: This is slow.
- * This function is called when we have lost CRWs due to overflows and we have
- * to do subchannel housekeeping.
- */
-void
-css_reiterate_subchannels(void)
-{
- css_clear_subchannel_slow_list();
- need_rescan = 1;
-}
-
/*
* Called from the machine check handler for subchannel report words.
*/
-int
-css_process_crw(int rsid1, int rsid2)
+void css_process_crw(int rsid1, int rsid2)
{
- int ret;
struct subchannel_id mchk_schid;
CIO_CRW_EVENT(2, "source is subchannel %04X, subsystem id %x\n",
rsid1, rsid2);
-
- if (need_rescan)
- /* We need to iterate all subchannels anyway. */
- return -EAGAIN;
-
init_subchannel_id(&mchk_schid);
mchk_schid.sch_no = rsid1;
if (rsid2 != 0)
* use stsch() to find out if the subchannel in question has come
* or gone.
*/
- ret = css_evaluate_subchannel(mchk_schid, 0);
- if (ret == -EAGAIN) {
- if (css_enqueue_subchannel_slow(mchk_schid)) {
- css_clear_subchannel_slow_list();
- need_rescan = 1;
- }
- }
- return ret;
+ css_evaluate_subchannel(mchk_schid, 0);
}
static int __init
static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store);
-static inline int __init setup_css(int nr)
+static int __init setup_css(int nr)
{
u32 tod_high;
int ret;
subsys_initcall(init_channel_subsystem);
-int
-css_enqueue_subchannel_slow(struct subchannel_id schid)
-{
- struct slow_subchannel *new_slow_sch;
- unsigned long flags;
-
- new_slow_sch = kzalloc(sizeof(struct slow_subchannel), GFP_ATOMIC);
- if (!new_slow_sch)
- return -ENOMEM;
- new_slow_sch->schid = schid;
- spin_lock_irqsave(&slow_subchannel_lock, flags);
- list_add_tail(&new_slow_sch->slow_list, &slow_subchannels_head);
- spin_unlock_irqrestore(&slow_subchannel_lock, flags);
- return 0;
-}
-
-void
-css_clear_subchannel_slow_list(void)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&slow_subchannel_lock, flags);
- while (!list_empty(&slow_subchannels_head)) {
- struct slow_subchannel *slow_sch =
- list_entry(slow_subchannels_head.next,
- struct slow_subchannel, slow_list);
-
- list_del_init(slow_subchannels_head.next);
- kfree(slow_sch);
- }
- spin_unlock_irqrestore(&slow_subchannel_lock, flags);
-}
-
-
-
-int
-css_slow_subchannels_exist(void)
-{
- return (!list_empty(&slow_subchannels_head));
-}
-
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(css_bus_type);
EXPORT_SYMBOL_GPL(css_characteristics_avail);
git.openpandora.org / pandora-kernel.git / blobdiff