/*
- * drivers/s390/char/sclp.c
- * core function to access sclp interface
+ * core function to access sclp interface
*
- * S390 version
- * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Martin Peschke <mpeschke@de.ibm.com>
- * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ * Copyright IBM Corp. 1999, 2009
+ *
+ * Author(s): Martin Peschke <mpeschke@de.ibm.com>
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/reboot.h>
#include <linux/jiffies.h>
+#include <linux/init.h>
+#include <linux/suspend.h>
+#include <linux/completion.h>
+#include <linux/platform_device.h>
#include <asm/types.h>
#include <asm/s390_ext.h>
/* Lock to protect internal data consistency. */
static DEFINE_SPINLOCK(sclp_lock);
-/* Mask of events that we can receive from the sclp interface. */
+/* Mask of events that we can send to the sclp interface. */
static sccb_mask_t sclp_receive_mask;
-/* Mask of events that we can send to the sclp interface. */
+/* Mask of events that we can receive from the sclp interface. */
static sccb_mask_t sclp_send_mask;
/* List of registered event listeners and senders. */
static char sclp_read_sccb[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
static char sclp_init_sccb[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
+/* Suspend request */
+static DECLARE_COMPLETION(sclp_request_queue_flushed);
+
+static void sclp_suspend_req_cb(struct sclp_req *req, void *data)
+{
+ complete(&sclp_request_queue_flushed);
+}
+
+static struct sclp_req sclp_suspend_req;
+
/* Timer for request retries. */
static struct timer_list sclp_request_timer;
sclp_mask_state_initializing
} sclp_mask_state = sclp_mask_state_idle;
+/* Internal state: is the driver suspended? */
+static enum sclp_suspend_state_t {
+ sclp_suspend_state_running,
+ sclp_suspend_state_suspended,
+} sclp_suspend_state = sclp_suspend_state_running;
+
/* Maximum retry counts */
#define SCLP_INIT_RETRY 3
#define SCLP_MASK_RETRY 3
#define SCLP_RETRY_INTERVAL 30
static void sclp_process_queue(void);
+static void __sclp_make_read_req(void);
static int sclp_init_mask(int calculate);
static int sclp_init(void);
return 0;
}
-static inline void __sclp_make_read_req(void);
static void
__sclp_queue_read_req(void)
del_timer(&sclp_request_timer);
while (!list_empty(&sclp_req_queue)) {
req = list_entry(sclp_req_queue.next, struct sclp_req, list);
+ if (!req->sccb)
+ goto do_post;
rc = __sclp_start_request(req);
if (rc == 0)
break;
sclp_request_timeout, 0);
break;
}
+do_post:
/* Post-processing for aborted request */
list_del(&req->list);
if (req->callback) {
spin_unlock_irqrestore(&sclp_lock, flags);
}
+static int __sclp_can_add_request(struct sclp_req *req)
+{
+ if (req == &sclp_suspend_req || req == &sclp_init_req)
+ return 1;
+ if (sclp_suspend_state != sclp_suspend_state_running)
+ return 0;
+ if (sclp_init_state != sclp_init_state_initialized)
+ return 0;
+ if (sclp_activation_state != sclp_activation_state_active)
+ return 0;
+ return 1;
+}
+
/* Queue a new request. Return zero on success, non-zero otherwise. */
int
sclp_add_request(struct sclp_req *req)
int rc;
spin_lock_irqsave(&sclp_lock, flags);
- if ((sclp_init_state != sclp_init_state_initialized ||
- sclp_activation_state != sclp_activation_state_active) &&
- req != &sclp_init_req) {
+ if (!__sclp_can_add_request(req)) {
spin_unlock_irqrestore(&sclp_lock, flags);
return -EIO;
}
/* Start if request is first in list */
if (sclp_running_state == sclp_running_state_idle &&
req->list.prev == &sclp_req_queue) {
+ if (!req->sccb) {
+ list_del(&req->list);
+ rc = -ENODATA;
+ goto out;
+ }
rc = __sclp_start_request(req);
if (rc)
list_del(&req->list);
}
+out:
spin_unlock_irqrestore(&sclp_lock, flags);
return rc;
}
rc = 0;
for (offset = sizeof(struct sccb_header); offset < sccb->length;
offset += evbuf->length) {
- /* Search for event handler */
evbuf = (struct evbuf_header *) ((addr_t) sccb + offset);
+ /* Check for malformed hardware response */
+ if (evbuf->length == 0)
+ break;
+ /* Search for event handler */
reg = NULL;
list_for_each(l, &sclp_reg_list) {
reg = list_entry(l, struct sclp_register, list);
}
/* Prepare read event data request. Called while sclp_lock is locked. */
-static inline void
-__sclp_make_read_req(void)
+static void __sclp_make_read_req(void)
{
struct sccb_header *sccb;
}
sclp_running_state = sclp_running_state_idle;
}
- if (evbuf_pending && sclp_receive_mask != 0 &&
+ if (evbuf_pending &&
sclp_activation_state == sclp_activation_state_active)
__sclp_queue_read_req();
spin_unlock(&sclp_lock);
void
sclp_sync_wait(void)
{
+ unsigned long long old_tick;
unsigned long flags;
unsigned long cr0, cr0_sync;
u64 timeout;
if (!irq_context)
local_bh_disable();
/* Enable service-signal interruption, disable timer interrupts */
+ old_tick = local_tick_disable();
trace_hardirqs_on();
__ctl_store(cr0, 0, 0);
cr0_sync = cr0;
+ cr0_sync &= 0xffff00a0;
cr0_sync |= 0x00000200;
- cr0_sync &= 0xFFFFF3AC;
__ctl_load(cr0_sync, 0, 0);
__raw_local_irq_stosm(0x01);
/* Loop until driver state indicates finished request */
__ctl_load(cr0, 0, 0);
if (!irq_context)
_local_bh_enable();
+ local_tick_enable(old_tick);
local_irq_restore(flags);
}
-
EXPORT_SYMBOL(sclp_sync_wait);
/* Dispatch changes in send and receive mask to registered listeners. */
-static inline void
+static void
sclp_dispatch_state_change(void)
{
struct list_head *l;
reg = NULL;
list_for_each(l, &sclp_reg_list) {
reg = list_entry(l, struct sclp_register, list);
- receive_mask = reg->receive_mask & sclp_receive_mask;
- send_mask = reg->send_mask & sclp_send_mask;
+ receive_mask = reg->send_mask & sclp_receive_mask;
+ send_mask = reg->receive_mask & sclp_send_mask;
if (reg->sclp_receive_mask != receive_mask ||
reg->sclp_send_mask != send_mask) {
reg->sclp_receive_mask = receive_mask;
if (scbuf->validity_sclp_send_mask)
sclp_send_mask = scbuf->sclp_send_mask;
spin_unlock_irqrestore(&sclp_lock, flags);
+ if (scbuf->validity_sclp_active_facility_mask)
+ sclp_facilities = scbuf->sclp_active_facility_mask;
sclp_dispatch_state_change();
}
static struct sclp_register sclp_state_change_event = {
- .receive_mask = EvTyp_StateChange_Mask,
+ .receive_mask = EVTYP_STATECHANGE_MASK,
.receiver_fn = sclp_state_change_cb
};
/* Trigger initial state change callback */
reg->sclp_receive_mask = 0;
reg->sclp_send_mask = 0;
+ reg->pm_event_posted = 0;
list_add(®->list, &sclp_reg_list);
spin_unlock_irqrestore(&sclp_lock, flags);
rc = sclp_init_mask(1);
u16 mask_length;
sccb_mask_t receive_mask;
sccb_mask_t send_mask;
- sccb_mask_t sclp_send_mask;
sccb_mask_t sclp_receive_mask;
+ sccb_mask_t sclp_send_mask;
} __attribute__((packed));
/* Prepare init mask request. Called while sclp_lock is locked. */
/* Is this the interrupt we are waiting for? */
if (finished_sccb == 0)
return;
- if (finished_sccb != (u32) (addr_t) sclp_init_sccb) {
- printk(KERN_WARNING SCLP_HEADER "unsolicited interrupt "
- "for buffer at 0x%x\n", finished_sccb);
- return;
- }
+ if (finished_sccb != (u32) (addr_t) sclp_init_sccb)
+ panic("sclp: unsolicited interrupt for buffer at 0x%x\n",
+ finished_sccb);
spin_lock(&sclp_lock);
if (sclp_running_state == sclp_running_state_running) {
sclp_init_req.status = SCLP_REQ_DONE;
.notifier_call = sclp_reboot_event
};
+/*
+ * Suspend/resume SCLP notifier implementation
+ */
+
+static void sclp_pm_event(enum sclp_pm_event sclp_pm_event, int rollback)
+{
+ struct sclp_register *reg;
+ unsigned long flags;
+
+ if (!rollback) {
+ spin_lock_irqsave(&sclp_lock, flags);
+ list_for_each_entry(reg, &sclp_reg_list, list)
+ reg->pm_event_posted = 0;
+ spin_unlock_irqrestore(&sclp_lock, flags);
+ }
+ do {
+ spin_lock_irqsave(&sclp_lock, flags);
+ list_for_each_entry(reg, &sclp_reg_list, list) {
+ if (rollback && reg->pm_event_posted)
+ goto found;
+ if (!rollback && !reg->pm_event_posted)
+ goto found;
+ }
+ spin_unlock_irqrestore(&sclp_lock, flags);
+ return;
+found:
+ spin_unlock_irqrestore(&sclp_lock, flags);
+ if (reg->pm_event_fn)
+ reg->pm_event_fn(reg, sclp_pm_event);
+ reg->pm_event_posted = rollback ? 0 : 1;
+ } while (1);
+}
+
+/*
+ * Susend/resume callbacks for platform device
+ */
+
+static int sclp_freeze(struct device *dev)
+{
+ unsigned long flags;
+ int rc;
+
+ sclp_pm_event(SCLP_PM_EVENT_FREEZE, 0);
+
+ spin_lock_irqsave(&sclp_lock, flags);
+ sclp_suspend_state = sclp_suspend_state_suspended;
+ spin_unlock_irqrestore(&sclp_lock, flags);
+
+ /* Init supend data */
+ memset(&sclp_suspend_req, 0, sizeof(sclp_suspend_req));
+ sclp_suspend_req.callback = sclp_suspend_req_cb;
+ sclp_suspend_req.status = SCLP_REQ_FILLED;
+ init_completion(&sclp_request_queue_flushed);
+
+ rc = sclp_add_request(&sclp_suspend_req);
+ if (rc == 0)
+ wait_for_completion(&sclp_request_queue_flushed);
+ else if (rc != -ENODATA)
+ goto fail_thaw;
+
+ rc = sclp_deactivate();
+ if (rc)
+ goto fail_thaw;
+ return 0;
+
+fail_thaw:
+ spin_lock_irqsave(&sclp_lock, flags);
+ sclp_suspend_state = sclp_suspend_state_running;
+ spin_unlock_irqrestore(&sclp_lock, flags);
+ sclp_pm_event(SCLP_PM_EVENT_THAW, 1);
+ return rc;
+}
+
+static int sclp_undo_suspend(enum sclp_pm_event event)
+{
+ unsigned long flags;
+ int rc;
+
+ rc = sclp_reactivate();
+ if (rc)
+ return rc;
+
+ spin_lock_irqsave(&sclp_lock, flags);
+ sclp_suspend_state = sclp_suspend_state_running;
+ spin_unlock_irqrestore(&sclp_lock, flags);
+
+ sclp_pm_event(event, 0);
+ return 0;
+}
+
+static int sclp_thaw(struct device *dev)
+{
+ return sclp_undo_suspend(SCLP_PM_EVENT_THAW);
+}
+
+static int sclp_restore(struct device *dev)
+{
+ return sclp_undo_suspend(SCLP_PM_EVENT_RESTORE);
+}
+
+static const struct dev_pm_ops sclp_pm_ops = {
+ .freeze = sclp_freeze,
+ .thaw = sclp_thaw,
+ .restore = sclp_restore,
+};
+
+static struct platform_driver sclp_pdrv = {
+ .driver = {
+ .name = "sclp",
+ .owner = THIS_MODULE,
+ .pm = &sclp_pm_ops,
+ },
+};
+
+static struct platform_device *sclp_pdev;
+
/* Initialize SCLP driver. Return zero if driver is operational, non-zero
* otherwise. */
static int
sclp_init(void)
{
unsigned long flags;
- int rc;
+ int rc = 0;
- if (!MACHINE_HAS_SCLP)
- return -ENODEV;
spin_lock_irqsave(&sclp_lock, flags);
/* Check for previous or running initialization */
- if (sclp_init_state != sclp_init_state_uninitialized) {
- spin_unlock_irqrestore(&sclp_lock, flags);
- return 0;
- }
+ if (sclp_init_state != sclp_init_state_uninitialized)
+ goto fail_unlock;
sclp_init_state = sclp_init_state_initializing;
/* Set up variables */
INIT_LIST_HEAD(&sclp_req_queue);
spin_unlock_irqrestore(&sclp_lock, flags);
rc = sclp_check_interface();
spin_lock_irqsave(&sclp_lock, flags);
- if (rc) {
- sclp_init_state = sclp_init_state_uninitialized;
- spin_unlock_irqrestore(&sclp_lock, flags);
- return rc;
- }
+ if (rc)
+ goto fail_init_state_uninitialized;
/* Register reboot handler */
rc = register_reboot_notifier(&sclp_reboot_notifier);
- if (rc) {
- sclp_init_state = sclp_init_state_uninitialized;
- spin_unlock_irqrestore(&sclp_lock, flags);
- return rc;
- }
+ if (rc)
+ goto fail_init_state_uninitialized;
/* Register interrupt handler */
rc = register_early_external_interrupt(0x2401, sclp_interrupt_handler,
&ext_int_info_hwc);
- if (rc) {
- unregister_reboot_notifier(&sclp_reboot_notifier);
- sclp_init_state = sclp_init_state_uninitialized;
- spin_unlock_irqrestore(&sclp_lock, flags);
- return rc;
- }
+ if (rc)
+ goto fail_unregister_reboot_notifier;
sclp_init_state = sclp_init_state_initialized;
spin_unlock_irqrestore(&sclp_lock, flags);
/* Enable service-signal external interruption - needs to happen with
ctl_set_bit(0, 9);
sclp_init_mask(1);
return 0;
+
+fail_unregister_reboot_notifier:
+ unregister_reboot_notifier(&sclp_reboot_notifier);
+fail_init_state_uninitialized:
+ sclp_init_state = sclp_init_state_uninitialized;
+fail_unlock:
+ spin_unlock_irqrestore(&sclp_lock, flags);
+ return rc;
+}
+
+/*
+ * SCLP panic notifier: If we are suspended, we thaw SCLP in order to be able
+ * to print the panic message.
+ */
+static int sclp_panic_notify(struct notifier_block *self,
+ unsigned long event, void *data)
+{
+ if (sclp_suspend_state == sclp_suspend_state_suspended)
+ sclp_undo_suspend(SCLP_PM_EVENT_THAW);
+ return NOTIFY_OK;
}
+
+static struct notifier_block sclp_on_panic_nb = {
+ .notifier_call = sclp_panic_notify,
+ .priority = SCLP_PANIC_PRIO,
+};
+
+static __init int sclp_initcall(void)
+{
+ int rc;
+
+ rc = platform_driver_register(&sclp_pdrv);
+ if (rc)
+ return rc;
+ sclp_pdev = platform_device_register_simple("sclp", -1, NULL, 0);
+ rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0;
+ if (rc)
+ goto fail_platform_driver_unregister;
+ rc = atomic_notifier_chain_register(&panic_notifier_list,
+ &sclp_on_panic_nb);
+ if (rc)
+ goto fail_platform_device_unregister;
+
+ return sclp_init();
+
+fail_platform_device_unregister:
+ platform_device_unregister(sclp_pdev);
+fail_platform_driver_unregister:
+ platform_driver_unregister(&sclp_pdrv);
+ return rc;
+}
+
+arch_initcall(sclp_initcall);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff