[S390] pm: dcssblk power management callbacks.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 115 insertions, 17 deletions

diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index b21caf177e37..016f9e9d2591 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/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);