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-rw-r--r--drivers/s390/block/dasd.c109
-rw-r--r--drivers/s390/block/dasd_devmap.c1
-rw-r--r--drivers/s390/block/dasd_eckd.c108
-rw-r--r--drivers/s390/block/dasd_fba.c6
-rw-r--r--drivers/s390/block/dasd_int.h13
-rw-r--r--drivers/s390/block/dcssblk.c132
-rw-r--r--drivers/s390/block/xpram.c129
7 files changed, 459 insertions, 39 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 442bb98a2821..e5b84db0aa03 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -5,8 +5,7 @@
* Carsten Otte <Cotte@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
- * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
- *
+ * Copyright IBM Corp. 1999, 2009
*/
#define KMSG_COMPONENT "dasd"
@@ -61,6 +60,7 @@ static int dasd_flush_block_queue(struct dasd_block *);
static void dasd_device_tasklet(struct dasd_device *);
static void dasd_block_tasklet(struct dasd_block *);
static void do_kick_device(struct work_struct *);
+static void do_restore_device(struct work_struct *);
static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
static void dasd_device_timeout(unsigned long);
static void dasd_block_timeout(unsigned long);
@@ -109,6 +109,7 @@ struct dasd_device *dasd_alloc_device(void)
device->timer.function = dasd_device_timeout;
device->timer.data = (unsigned long) device;
INIT_WORK(&device->kick_work, do_kick_device);
+ INIT_WORK(&device->restore_device, do_restore_device);
device->state = DASD_STATE_NEW;
device->target = DASD_STATE_NEW;
@@ -512,6 +513,25 @@ void dasd_kick_device(struct dasd_device *device)
}
/*
+ * dasd_restore_device will schedule a call do do_restore_device to the kernel
+ * event daemon.
+ */
+static void do_restore_device(struct work_struct *work)
+{
+ struct dasd_device *device = container_of(work, struct dasd_device,
+ restore_device);
+ device->cdev->drv->restore(device->cdev);
+ dasd_put_device(device);
+}
+
+void dasd_restore_device(struct dasd_device *device)
+{
+ dasd_get_device(device);
+ /* queue call to dasd_restore_device to the kernel event daemon. */
+ schedule_work(&device->restore_device);
+}
+
+/*
* Set the target state for a device and starts the state change.
*/
void dasd_set_target_state(struct dasd_device *device, int target)
@@ -908,6 +928,12 @@ int dasd_start_IO(struct dasd_ccw_req *cqr)
DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
"start_IO: -EIO device gone, retry");
break;
+ case -EINVAL:
+ /* most likely caused in power management context */
+ DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
+ "start_IO: -EINVAL device currently "
+ "not accessible");
+ break;
default:
/* internal error 11 - unknown rc */
snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
@@ -2400,6 +2426,12 @@ int dasd_generic_notify(struct ccw_device *cdev, int event)
case CIO_OPER:
/* FIXME: add a sanity check. */
device->stopped &= ~DASD_STOPPED_DC_WAIT;
+ if (device->stopped & DASD_UNRESUMED_PM) {
+ device->stopped &= ~DASD_UNRESUMED_PM;
+ dasd_restore_device(device);
+ ret = 1;
+ break;
+ }
dasd_schedule_device_bh(device);
if (device->block)
dasd_schedule_block_bh(device->block);
@@ -2410,6 +2442,79 @@ int dasd_generic_notify(struct ccw_device *cdev, int event)
return ret;
}
+int dasd_generic_pm_freeze(struct ccw_device *cdev)
+{
+ struct dasd_ccw_req *cqr, *n;
+ int rc;
+ struct list_head freeze_queue;
+ struct dasd_device *device = dasd_device_from_cdev(cdev);
+
+ if (IS_ERR(device))
+ return PTR_ERR(device);
+ /* disallow new I/O */
+ device->stopped |= DASD_STOPPED_PM;
+ /* clear active requests */
+ INIT_LIST_HEAD(&freeze_queue);
+ spin_lock_irq(get_ccwdev_lock(cdev));
+ rc = 0;
+ list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
+ /* Check status and move request to flush_queue */
+ if (cqr->status == DASD_CQR_IN_IO) {
+ rc = device->discipline->term_IO(cqr);
+ if (rc) {
+ /* unable to terminate requeust */
+ dev_err(&device->cdev->dev,
+ "Unable to terminate request %p "
+ "on suspend\n", cqr);
+ spin_unlock_irq(get_ccwdev_lock(cdev));
+ dasd_put_device(device);
+ return rc;
+ }
+ }
+ list_move_tail(&cqr->devlist, &freeze_queue);
+ }
+
+ spin_unlock_irq(get_ccwdev_lock(cdev));
+
+ list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
+ wait_event(dasd_flush_wq,
+ (cqr->status != DASD_CQR_CLEAR_PENDING));
+ if (cqr->status == DASD_CQR_CLEARED)
+ cqr->status = DASD_CQR_QUEUED;
+ }
+ /* move freeze_queue to start of the ccw_queue */
+ spin_lock_irq(get_ccwdev_lock(cdev));
+ list_splice_tail(&freeze_queue, &device->ccw_queue);
+ spin_unlock_irq(get_ccwdev_lock(cdev));
+
+ if (device->discipline->freeze)
+ rc = device->discipline->freeze(device);
+
+ dasd_put_device(device);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
+
+int dasd_generic_restore_device(struct ccw_device *cdev)
+{
+ struct dasd_device *device = dasd_device_from_cdev(cdev);
+ int rc = 0;
+
+ if (IS_ERR(device))
+ return PTR_ERR(device);
+
+ dasd_schedule_device_bh(device);
+ if (device->block)
+ dasd_schedule_block_bh(device->block);
+
+ if (device->discipline->restore)
+ rc = device->discipline->restore(device);
+
+ dasd_put_device(device);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
+
static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
void *rdc_buffer,
int rdc_buffer_size,
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index e77666c8e6c0..4cac5b54f26a 100644
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -1098,6 +1098,7 @@ dasd_get_uid(struct ccw_device *cdev, struct dasd_uid *uid)
spin_unlock(&dasd_devmap_lock);
return 0;
}
+EXPORT_SYMBOL_GPL(dasd_get_uid);
/*
* Register the given device unique identifier into devmap struct.
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index cf0cfdba1244..1c28ec3e4ccb 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -5,10 +5,9 @@
* Carsten Otte <Cotte@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
- * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
+ * Copyright IBM Corp. 1999, 2009
* EMC Symmetrix ioctl Copyright EMC Corporation, 2008
* Author.........: Nigel Hislop <hislop_nigel@emc.com>
- *
*/
#define KMSG_COMPONENT "dasd"
@@ -104,17 +103,6 @@ dasd_eckd_set_online(struct ccw_device *cdev)
return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
}
-static struct ccw_driver dasd_eckd_driver = {
- .name = "dasd-eckd",
- .owner = THIS_MODULE,
- .ids = dasd_eckd_ids,
- .probe = dasd_eckd_probe,
- .remove = dasd_generic_remove,
- .set_offline = dasd_generic_set_offline,
- .set_online = dasd_eckd_set_online,
- .notify = dasd_generic_notify,
-};
-
static const int sizes_trk0[] = { 28, 148, 84 };
#define LABEL_SIZE 140
@@ -3236,6 +3224,98 @@ static void dasd_eckd_dump_sense(struct dasd_device *device,
dasd_eckd_dump_sense_ccw(device, req, irb);
}
+int dasd_eckd_pm_freeze(struct dasd_device *device)
+{
+ /*
+ * the device should be disconnected from our LCU structure
+ * on restore we will reconnect it and reread LCU specific
+ * information like PAV support that might have changed
+ */
+ dasd_alias_remove_device(device);
+ dasd_alias_disconnect_device_from_lcu(device);
+
+ return 0;
+}
+
+int dasd_eckd_restore_device(struct dasd_device *device)
+{
+ struct dasd_eckd_private *private;
+ int is_known, rc;
+ struct dasd_uid temp_uid;
+
+ /* allow new IO again */
+ device->stopped &= ~DASD_STOPPED_PM;
+
+ private = (struct dasd_eckd_private *) device->private;
+
+ /* Read Configuration Data */
+ rc = dasd_eckd_read_conf(device);
+ if (rc)
+ goto out_err;
+
+ /* Generate device unique id and register in devmap */
+ rc = dasd_eckd_generate_uid(device, &private->uid);
+ dasd_get_uid(device->cdev, &temp_uid);
+ if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
+ dev_err(&device->cdev->dev, "The UID of the DASD has changed\n");
+ if (rc)
+ goto out_err;
+ dasd_set_uid(device->cdev, &private->uid);
+
+ /* register lcu with alias handling, enable PAV if this is a new lcu */
+ is_known = dasd_alias_make_device_known_to_lcu(device);
+ if (is_known < 0)
+ return is_known;
+ if (!is_known) {
+ /* new lcu found */
+ rc = dasd_eckd_validate_server(device); /* will switch pav on */
+ if (rc)
+ goto out_err;
+ }
+
+ /* Read Feature Codes */
+ rc = dasd_eckd_read_features(device);
+ if (rc)
+ goto out_err;
+
+ /* Read Device Characteristics */
+ memset(&private->rdc_data, 0, sizeof(private->rdc_data));
+ rc = dasd_generic_read_dev_chars(device, "ECKD",
+ &private->rdc_data, 64);
+ if (rc) {
+ DBF_EVENT(DBF_WARNING,
+ "Read device characteristics failed, rc=%d for "
+ "device: %s", rc, dev_name(&device->cdev->dev));
+ goto out_err;
+ }
+
+ /* add device to alias management */
+ dasd_alias_add_device(device);
+
+ return 0;
+
+out_err:
+ /*
+ * if the resume failed for the DASD we put it in
+ * an UNRESUMED stop state
+ */
+ device->stopped |= DASD_UNRESUMED_PM;
+ return 0;
+}
+
+static struct ccw_driver dasd_eckd_driver = {
+ .name = "dasd-eckd",
+ .owner = THIS_MODULE,
+ .ids = dasd_eckd_ids,
+ .probe = dasd_eckd_probe,
+ .remove = dasd_generic_remove,
+ .set_offline = dasd_generic_set_offline,
+ .set_online = dasd_eckd_set_online,
+ .notify = dasd_generic_notify,
+ .freeze = dasd_generic_pm_freeze,
+ .thaw = dasd_generic_restore_device,
+ .restore = dasd_generic_restore_device,
+};
/*
* max_blocks is dependent on the amount of storage that is available
@@ -3274,6 +3354,8 @@ static struct dasd_discipline dasd_eckd_discipline = {
.dump_sense_dbf = dasd_eckd_dump_sense_dbf,
.fill_info = dasd_eckd_fill_info,
.ioctl = dasd_eckd_ioctl,
+ .freeze = dasd_eckd_pm_freeze,
+ .restore = dasd_eckd_restore_device,
};
static int __init
diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c
index 597c6ffdb9f2..e21ee735f926 100644
--- a/drivers/s390/block/dasd_fba.c
+++ b/drivers/s390/block/dasd_fba.c
@@ -2,8 +2,7 @@
* File...........: linux/drivers/s390/block/dasd_fba.c
* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
- * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
- *
+ * Copyright IBM Corp. 1999, 2009
*/
#define KMSG_COMPONENT "dasd"
@@ -75,6 +74,9 @@ static struct ccw_driver dasd_fba_driver = {
.set_offline = dasd_generic_set_offline,
.set_online = dasd_fba_set_online,
.notify = dasd_generic_notify,
+ .freeze = dasd_generic_pm_freeze,
+ .thaw = dasd_generic_restore_device,
+ .restore = dasd_generic_restore_device,
};
static void
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index f97ceb795078..fd63b2f2bda9 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -4,8 +4,7 @@
* Horst Hummel <Horst.Hummel@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
- * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
- *
+ * Copyright IBM Corp. 1999, 2009
*/
#ifndef DASD_INT_H
@@ -295,6 +294,10 @@ struct dasd_discipline {
int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
+
+ /* suspend/resume functions */
+ int (*freeze) (struct dasd_device *);
+ int (*restore) (struct dasd_device *);
};
extern struct dasd_discipline *dasd_diag_discipline_pointer;
@@ -367,6 +370,7 @@ struct dasd_device {
atomic_t tasklet_scheduled;
struct tasklet_struct tasklet;
struct work_struct kick_work;
+ struct work_struct restore_device;
struct timer_list timer;
debug_info_t *debug_area;
@@ -410,6 +414,8 @@ struct dasd_block {
#define DASD_STOPPED_PENDING 4 /* long busy */
#define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */
#define DASD_STOPPED_SU 16 /* summary unit check handling */
+#define DASD_STOPPED_PM 32 /* pm state transition */
+#define DASD_UNRESUMED_PM 64 /* pm resume failed state */
/* per device flags */
#define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
@@ -556,6 +562,7 @@ void dasd_free_block(struct dasd_block *);
void dasd_enable_device(struct dasd_device *);
void dasd_set_target_state(struct dasd_device *, int);
void dasd_kick_device(struct dasd_device *);
+void dasd_restore_device(struct dasd_device *);
void dasd_add_request_head(struct dasd_ccw_req *);
void dasd_add_request_tail(struct dasd_ccw_req *);
@@ -578,6 +585,8 @@ int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
int dasd_generic_set_offline (struct ccw_device *cdev);
int dasd_generic_notify(struct ccw_device *, int);
void dasd_generic_handle_state_change(struct dasd_device *);
+int dasd_generic_pm_freeze(struct ccw_device *);
+int dasd_generic_restore_device(struct ccw_device *);
int dasd_generic_read_dev_chars(struct dasd_device *, char *, void *, int);
char *dasd_get_sense(struct irb *);
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);
diff --git a/drivers/s390/block/xpram.c b/drivers/s390/block/xpram.c
index 0ae0c83ef879..2e9e1ecd6d82 100644
--- a/drivers/s390/block/xpram.c
+++ b/drivers/s390/block/xpram.c
@@ -39,7 +39,10 @@
#include <linux/hdreg.h> /* HDIO_GETGEO */
#include <linux/sysdev.h>
#include <linux/bio.h>
+#include <linux/suspend.h>
+#include <linux/platform_device.h>
#include <asm/uaccess.h>
+#include <asm/checksum.h>
#define XPRAM_NAME "xpram"
#define XPRAM_DEVS 1 /* one partition */
@@ -48,6 +51,7 @@
typedef struct {
unsigned int size; /* size of xpram segment in pages */
unsigned int offset; /* start page of xpram segment */
+ unsigned int csum; /* partition checksum for suspend */
} xpram_device_t;
static xpram_device_t xpram_devices[XPRAM_MAX_DEVS];
@@ -138,7 +142,7 @@ static long xpram_page_out (unsigned long page_addr, unsigned int xpage_index)
/*
* Check if xpram is available.
*/
-static int __init xpram_present(void)
+static int xpram_present(void)
{
unsigned long mem_page;
int rc;
@@ -154,7 +158,7 @@ static int __init xpram_present(void)
/*
* Return index of the last available xpram page.
*/
-static unsigned long __init xpram_highest_page_index(void)
+static unsigned long xpram_highest_page_index(void)
{
unsigned int page_index, add_bit;
unsigned long mem_page;
@@ -383,6 +387,106 @@ out:
}
/*
+ * Save checksums for all partitions.
+ */
+static int xpram_save_checksums(void)
+{
+ unsigned long mem_page;
+ int rc, i;
+
+ rc = 0;
+ mem_page = (unsigned long) __get_free_page(GFP_KERNEL);
+ if (!mem_page)
+ return -ENOMEM;
+ for (i = 0; i < xpram_devs; i++) {
+ rc = xpram_page_in(mem_page, xpram_devices[i].offset);
+ if (rc)
+ goto fail;
+ xpram_devices[i].csum = csum_partial((const void *) mem_page,
+ PAGE_SIZE, 0);
+ }
+fail:
+ free_page(mem_page);
+ return rc ? -ENXIO : 0;
+}
+
+/*
+ * Verify checksums for all partitions.
+ */
+static int xpram_validate_checksums(void)
+{
+ unsigned long mem_page;
+ unsigned int csum;
+ int rc, i;
+
+ rc = 0;
+ mem_page = (unsigned long) __get_free_page(GFP_KERNEL);
+ if (!mem_page)
+ return -ENOMEM;
+ for (i = 0; i < xpram_devs; i++) {
+ rc = xpram_page_in(mem_page, xpram_devices[i].offset);
+ if (rc)
+ goto fail;
+ csum = csum_partial((const void *) mem_page, PAGE_SIZE, 0);
+ if (xpram_devices[i].csum != csum) {
+ rc = -EINVAL;
+ goto fail;
+ }
+ }
+fail:
+ free_page(mem_page);
+ return rc ? -ENXIO : 0;
+}
+
+/*
+ * Resume failed: Print error message and call panic.
+ */
+static void xpram_resume_error(const char *message)
+{
+ pr_err("Resume error: %s\n", message);
+ panic("xpram resume error\n");
+}
+
+/*
+ * Check if xpram setup changed between suspend and resume.
+ */
+static int xpram_restore(struct device *dev)
+{
+ if (!xpram_pages)
+ return 0;
+ if (xpram_present() != 0)
+ xpram_resume_error("xpram disappeared");
+ if (xpram_pages != xpram_highest_page_index() + 1)
+ xpram_resume_error("Size of xpram changed");
+ if (xpram_validate_checksums())
+ xpram_resume_error("Data of xpram changed");
+ return 0;
+}
+
+/*
+ * Save necessary state in suspend.
+ */
+static int xpram_freeze(struct device *dev)
+{
+ return xpram_save_checksums();
+}
+
+static struct dev_pm_ops xpram_pm_ops = {
+ .freeze = xpram_freeze,
+ .restore = xpram_restore,
+};
+
+static struct platform_driver xpram_pdrv = {
+ .driver = {
+ .name = XPRAM_NAME,
+ .owner = THIS_MODULE,
+ .pm = &xpram_pm_ops,
+ },
+};
+
+static struct platform_device *xpram_pdev;
+
+/*
* Finally, the init/exit functions.
*/
static void __exit xpram_exit(void)
@@ -394,6 +498,8 @@ static void __exit xpram_exit(void)
put_disk(xpram_disks[i]);
}
unregister_blkdev(XPRAM_MAJOR, XPRAM_NAME);
+ platform_device_unregister(xpram_pdev);
+ platform_driver_unregister(&xpram_pdrv);
}
static int __init xpram_init(void)
@@ -411,7 +517,24 @@ static int __init xpram_init(void)
rc = xpram_setup_sizes(xpram_pages);
if (rc)
return rc;
- return xpram_setup_blkdev();
+ rc = platform_driver_register(&xpram_pdrv);
+ if (rc)
+ return rc;
+ xpram_pdev = platform_device_register_simple(XPRAM_NAME, -1, NULL, 0);
+ if (IS_ERR(xpram_pdev)) {
+ rc = PTR_ERR(xpram_pdev);
+ goto fail_platform_driver_unregister;
+ }
+ rc = xpram_setup_blkdev();
+ if (rc)
+ goto fail_platform_device_unregister;
+ return 0;
+
+fail_platform_device_unregister:
+ platform_device_unregister(xpram_pdev);
+fail_platform_driver_unregister:
+ platform_driver_unregister(&xpram_pdrv);
+ return rc;
}
module_init(xpram_init);
generated by cgit (git 2.34.1) at 2025-05-09 09:14:46 +0000