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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2013-06-06 11:50:21 +0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-06-26 23:10:12 +0400
commite9a8f32a98a6099b009ea7da4f299bb5427db126 (patch)
tree0fc44d45b835859404ace9043c11696f64fea67a /drivers/s390/cio/chsc_sch.c
parent7a9cc6e18b8fe751a41349b188dd468a8317192a (diff)
downloadlinux-e9a8f32a98a6099b009ea7da4f299bb5427db126.tar.xz
s390/cio: Introduce on-close CHSC IOCTLs
Introduce two new ioctls CHSC_ON_CLOSE_SET and CHSC_ON_CLOSE_REMOVE that allow to add and remove one CHSC that is unconditionally executed when the CHSC device node is closed. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/chsc_sch.c')
-rw-r--r--drivers/s390/cio/chsc_sch.c94
1 files changed, 94 insertions, 0 deletions
diff --git a/drivers/s390/cio/chsc_sch.c b/drivers/s390/cio/chsc_sch.c
index 5fe9f8c4b4fb..64cd60063ffc 100644
--- a/drivers/s390/cio/chsc_sch.c
+++ b/drivers/s390/cio/chsc_sch.c
@@ -29,6 +29,10 @@
static debug_info_t *chsc_debug_msg_id;
static debug_info_t *chsc_debug_log_id;
+static struct chsc_request *on_close_request;
+static struct chsc_async_area *on_close_chsc_area;
+static DEFINE_MUTEX(on_close_mutex);
+
#define CHSC_MSG(imp, args...) do { \
debug_sprintf_event(chsc_debug_msg_id, imp , ##args); \
} while (0)
@@ -362,6 +366,68 @@ out_free:
return ret;
}
+static int chsc_ioctl_on_close_set(void __user *user_area)
+{
+ char dbf[13];
+ int ret;
+
+ mutex_lock(&on_close_mutex);
+ if (on_close_chsc_area) {
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+ on_close_request = kzalloc(sizeof(*on_close_request), GFP_KERNEL);
+ if (!on_close_request) {
+ ret = -ENOMEM;
+ goto out_unlock;
+ }
+ on_close_chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
+ if (!on_close_chsc_area) {
+ ret = -ENOMEM;
+ goto out_free_request;
+ }
+ if (copy_from_user(on_close_chsc_area, user_area, PAGE_SIZE)) {
+ ret = -EFAULT;
+ goto out_free_chsc;
+ }
+ ret = 0;
+ goto out_unlock;
+
+out_free_chsc:
+ free_page((unsigned long)on_close_chsc_area);
+ on_close_chsc_area = NULL;
+out_free_request:
+ kfree(on_close_request);
+ on_close_request = NULL;
+out_unlock:
+ mutex_unlock(&on_close_mutex);
+ sprintf(dbf, "ocsret:%d", ret);
+ CHSC_LOG(0, dbf);
+ return ret;
+}
+
+static int chsc_ioctl_on_close_remove(void)
+{
+ char dbf[13];
+ int ret;
+
+ mutex_lock(&on_close_mutex);
+ if (!on_close_chsc_area) {
+ ret = -ENOENT;
+ goto out_unlock;
+ }
+ free_page((unsigned long)on_close_chsc_area);
+ on_close_chsc_area = NULL;
+ kfree(on_close_request);
+ on_close_request = NULL;
+ ret = 0;
+out_unlock:
+ mutex_unlock(&on_close_mutex);
+ sprintf(dbf, "ocrret:%d", ret);
+ CHSC_LOG(0, dbf);
+ return ret;
+}
+
static int chsc_ioctl_start_sync(void __user *user_area)
{
struct chsc_sync_area *chsc_area;
@@ -842,6 +908,10 @@ static long chsc_ioctl(struct file *filp, unsigned int cmd,
return chsc_ioctl_chpd(argp);
case CHSC_INFO_DCAL:
return chsc_ioctl_dcal(argp);
+ case CHSC_ON_CLOSE_SET:
+ return chsc_ioctl_on_close_set(argp);
+ case CHSC_ON_CLOSE_REMOVE:
+ return chsc_ioctl_on_close_remove();
default: /* unknown ioctl number */
return -ENOIOCTLCMD;
}
@@ -860,6 +930,30 @@ static int chsc_open(struct inode *inode, struct file *file)
static int chsc_release(struct inode *inode, struct file *filp)
{
+ char dbf[13];
+ int ret;
+
+ mutex_lock(&on_close_mutex);
+ if (!on_close_chsc_area)
+ goto out_unlock;
+ init_completion(&on_close_request->completion);
+ CHSC_LOG(0, "on_close");
+ chsc_log_command(on_close_chsc_area);
+ spin_lock_irq(&chsc_lock);
+ ret = chsc_async(on_close_chsc_area, on_close_request);
+ spin_unlock_irq(&chsc_lock);
+ if (ret == -EINPROGRESS) {
+ wait_for_completion(&on_close_request->completion);
+ ret = chsc_examine_irb(on_close_request);
+ }
+ sprintf(dbf, "relret:%d", ret);
+ CHSC_LOG(0, dbf);
+ free_page((unsigned long)on_close_chsc_area);
+ on_close_chsc_area = NULL;
+ kfree(on_close_request);
+ on_close_request = NULL;
+out_unlock:
+ mutex_unlock(&on_close_mutex);
atomic_inc(&chsc_ready_for_use);
return 0;
}