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>
diff --git a/arch/s390/include/uapi/asm/chsc.h b/arch/s390/include/uapi/asm/chsc.h
index 6e5307f..65dc694 100644
--- a/arch/s390/include/uapi/asm/chsc.h
+++ b/arch/s390/include/uapi/asm/chsc.h
@@ -137,5 +137,7 @@
#define CHSC_INFO_CPD _IOWR(CHSC_IOCTL_MAGIC, 0x87, struct chsc_cpd_info)
#define CHSC_INFO_DCAL _IOWR(CHSC_IOCTL_MAGIC, 0x88, struct chsc_dcal)
#define CHSC_START_SYNC _IOWR(CHSC_IOCTL_MAGIC, 0x89, struct chsc_sync_area)
+#define CHSC_ON_CLOSE_SET _IOWR(CHSC_IOCTL_MAGIC, 0x8a, struct chsc_async_area)
+#define CHSC_ON_CLOSE_REMOVE _IO(CHSC_IOCTL_MAGIC, 0x8b)
#endif
diff --git a/drivers/s390/cio/chsc_sch.c b/drivers/s390/cio/chsc_sch.c
index 5fe9f8c..64cd600 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 @@
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 @@
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_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;
}