s390/sclp: Remove sclp base power management support

Power management support was removed for s390 with
commit 394216275c7d ("s390: remove broken hibernate / power management
support").

Remove leftover sclp base-related power management code. Note that we
keep the registration of the sclp platform driver since it is used to
externalize non-PM related attributes in sysfs.

Acked-by: Heiko Carstens <[e-mail]>
Signed-off-by: Peter Oberparleiter <[e-mail]>
Signed-off-by: Vasily Gorbik <[e-mail]>

drivers/s390/char/sclp.c

···
 #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/irq.h>
···
 static void *sclp_read_sccb;
 static struct init_sccb *sclp_init_sccb;
 
-/* Suspend request */
-static DECLARE_COMPLETION(sclp_request_queue_flushed);
-
 /* Number of console pages to allocate, used by sclp_con.c and sclp_vt220.c */
 int sclp_console_pages = SCLP_CONSOLE_PAGES;
 /* Flag to indicate if buffer pages are dropped on buffer full condition */
 int sclp_console_drop = 1;
 /* Number of times the console dropped buffer pages */
 unsigned long sclp_console_full;
-
-static void sclp_suspend_req_cb(struct sclp_req *req, void *data)
-{
-	complete(&sclp_request_queue_flushed);
-}
 
 static int __init sclp_setup_console_pages(char *str)
 {
···
 }
 
 __setup("sclp_con_drop=", sclp_setup_console_drop);
-
-static struct sclp_req sclp_suspend_req;
 
 /* Timer for request retries. */
 static struct timer_list sclp_request_timer;
···
 	sclp_mask_state_idle,
 	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
···
 	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_normal);
 			break;
 		}
-do_post:
 		/* Post-processing for aborted request */
 		list_del(&req->list);
 		if (req->callback) {
···
 
 static int __sclp_can_add_request(struct sclp_req *req)
 {
-	if (req == &sclp_suspend_req || req == &sclp_init_req)
+	if (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)
···
 	/* 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;
 }
···
 	/* Trigger initial state change callback */
 	reg->sclp_receive_mask = 0;
 	reg->sclp_send_mask = 0;
-	reg->pm_event_posted = 0;
 	list_add(&reg->list, &sclp_reg_list);
 	spin_unlock_irqrestore(&sclp_lock, flags);
 	rc = sclp_init_mask(1);
···
 	.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 ssize_t con_pages_show(struct device_driver *dev, char *buf)
 {
 	return sprintf(buf, "%i\n", sclp_console_pages);
···
 static struct platform_driver sclp_pdrv = {
 	.driver = {
 		.name	= "sclp",
-		.pm	= &sclp_pm_ops,
 		.groups = sclp_drv_attr_groups,
 	},
 };
-
-static struct platform_device *sclp_pdev;
 
 /* Initialize SCLP driver. Return zero if driver is operational, non-zero
  * otherwise. */
···
 	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;
···
 	if (rc)
 		return rc;
 
-	sclp_pdev = platform_device_register_simple("sclp", -1, NULL, 0);
-	rc = PTR_ERR_OR_ZERO(sclp_pdev);
-	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);

drivers/s390/char/sclp.h

···
 
 #define GDS_KEY_SELFDEFTEXTMSG	0x31
 
-enum sclp_pm_event {
-	SCLP_PM_EVENT_FREEZE,
-	SCLP_PM_EVENT_THAW,
-	SCLP_PM_EVENT_RESTORE,
-};
-
-#define SCLP_PANIC_PRIO		1
-#define SCLP_PANIC_PRIO_CLIENT	0
-
 typedef u64 sccb_mask_t;
 
 struct sccb_header {
···
 	void (*state_change_fn)(struct sclp_register *);
 	/* called for events in cp_receive_mask/sclp_receive_mask */
 	void (*receiver_fn)(struct evbuf_header *);
-	/* called for power management events */
-	void (*pm_event_fn)(struct sclp_register *, enum sclp_pm_event);
-	/* pm event posted flag */
-	int pm_event_posted;
 };
 
 /* externals from sclp.c */

drivers/s390/char/sclp_ftp.c

···
 	.receive_mask = EVTYP_DIAG_TEST_MASK, /* want rx events */
 	.receiver_fn = sclp_ftp_rxcb,	      /* async callback (rx) */
 	.state_change_fn = NULL,
-	.pm_event_fn = NULL,
 };
 
 /**