lkml.org 
[lkml]   [2009]   [Jun]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[patch 37/38] pm: dcssblk power management callbacks.
From: Gerald Schaefer <gerald.schaefer@de.ibm.com>

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---
drivers/s390/block/dcssblk.c | 132 +++++++++++++++++++++++++++++++++++++------
1 file changed, 115 insertions(+), 17 deletions(-)
Index: linux-2.6/drivers/s390/block/dcssblk.c
===================================================================
--- linux-2.6.orig/drivers/s390/block/dcssblk.c
+++ linux-2.6/drivers/s390/block/dcssblk.c
@@ -14,10 +14,11 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
-#include <asm/extmem.h>
-#include <asm/io.h>
#include <linux/completion.h>
#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <asm/extmem.h>
+#include <asm/io.h>

#define DCSSBLK_NAME "dcssblk"
#define DCSSBLK_MINORS_PER_DISK 1
@@ -940,11 +941,94 @@ dcssblk_check_params(void)
}

/*
+ * Suspend / Resume
+ */
+static int dcssblk_freeze(struct device *dev)
+{
+ struct dcssblk_dev_info *dev_info;
+ int rc = 0;
+
+ list_for_each_entry(dev_info, &dcssblk_devices, lh) {
+ switch (dev_info->segment_type) {
+ case SEG_TYPE_SR:
+ case SEG_TYPE_ER:
+ case SEG_TYPE_SC:
+ if (!dev_info->is_shared)
+ rc = -EINVAL;
+ break;
+ default:
+ rc = -EINVAL;
+ break;
+ }
+ if (rc)
+ break;
+ }
+ if (rc)
+ pr_err("Suspend failed because device %s is writeable.\n",
+ dev_info->segment_name);
+ return rc;
+}
+
+static int dcssblk_restore(struct device *dev)
+{
+ struct dcssblk_dev_info *dev_info;
+ struct segment_info *entry;
+ unsigned long start, end;
+ int rc = 0;
+
+ list_for_each_entry(dev_info, &dcssblk_devices, lh) {
+ list_for_each_entry(entry, &dev_info->seg_list, lh) {
+ segment_unload(entry->segment_name);
+ rc = segment_load(entry->segment_name, SEGMENT_SHARED,
+ &start, &end);
+ if (rc < 0) {
+// TODO in_use check ?
+ segment_warning(rc, entry->segment_name);
+ goto out_panic;
+ }
+ if (start != entry->start || end != entry->end) {
+ pr_err("Mismatch of start / end address after "
+ "resuming device %s\n",
+ entry->segment_name);
+ goto out_panic;
+ }
+ }
+ }
+ return 0;
+out_panic:
+ panic("fatal dcssblk resume error\n");
+}
+
+static int dcssblk_thaw(struct device *dev)
+{
+ return 0;
+}
+
+static struct dev_pm_ops dcssblk_pm_ops = {
+ .freeze = dcssblk_freeze,
+ .thaw = dcssblk_thaw,
+ .restore = dcssblk_restore,
+};
+
+static struct platform_driver dcssblk_pdrv = {
+ .driver = {
+ .name = "dcssblk",
+ .owner = THIS_MODULE,
+ .pm = &dcssblk_pm_ops,
+ },
+};
+
+static struct platform_device *dcssblk_pdev;
+
+
+/*
* The init/exit functions.
*/
static void __exit
dcssblk_exit(void)
{
+ platform_device_unregister(dcssblk_pdev);
+ platform_driver_unregister(&dcssblk_pdrv);
root_device_unregister(dcssblk_root_dev);
unregister_blkdev(dcssblk_major, DCSSBLK_NAME);
}
@@ -954,30 +1038,44 @@ dcssblk_init(void)
{
int rc;

- dcssblk_root_dev = root_device_register("dcssblk");
- if (IS_ERR(dcssblk_root_dev))
- return PTR_ERR(dcssblk_root_dev);
- rc = device_create_file(dcssblk_root_dev, &dev_attr_add);
- if (rc) {
- root_device_unregister(dcssblk_root_dev);
+ rc = platform_driver_register(&dcssblk_pdrv);
+ if (rc)
return rc;
+
+ dcssblk_pdev = platform_device_register_simple("dcssblk", -1, NULL,
+ 0);
+ if (IS_ERR(dcssblk_pdev)) {
+ rc = PTR_ERR(dcssblk_pdev);
+ goto out_pdrv;
}
- rc = device_create_file(dcssblk_root_dev, &dev_attr_remove);
- if (rc) {
- root_device_unregister(dcssblk_root_dev);
- return rc;
+
+ dcssblk_root_dev = root_device_register("dcssblk");
+ if (IS_ERR(dcssblk_root_dev)) {
+ rc = PTR_ERR(dcssblk_root_dev);
+ goto out_pdev;
}
+ rc = device_create_file(dcssblk_root_dev, &dev_attr_add);
+ if (rc)
+ goto out_root;
+ rc = device_create_file(dcssblk_root_dev, &dev_attr_remove);
+ if (rc)
+ goto out_root;
rc = register_blkdev(0, DCSSBLK_NAME);
- if (rc < 0) {
- root_device_unregister(dcssblk_root_dev);
- return rc;
- }
+ if (rc < 0)
+ goto out_root;
dcssblk_major = rc;
init_rwsem(&dcssblk_devices_sem);

dcssblk_check_params();
-
return 0;
+
+out_root:
+ root_device_unregister(dcssblk_root_dev);
+out_pdev:
+ platform_device_unregister(dcssblk_pdev);
+out_pdrv:
+ platform_driver_unregister(&dcssblk_pdrv);
+ return rc;
}

module_init(dcssblk_init);
--
blue skies,
Martin.

"Reality continues to ruin my life." - Calvin.



\
 
 \ /
  Last update: 2009-06-04 19:03    [from the cache]
©2003-2011 Jasper Spaans