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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2013-06-06 11:44:28 +0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-06-26 23:10:10 +0400
commit64150adf89df2ed165d6760f414fa6df07d22628 (patch)
treefaacbf1ffd1daf2aa370d2b4880b8b093ac2966f /drivers/s390/cio/chsc_sch.c
parent80b054ba2ab1c46e6c34c6a54f542d8f7ad77fca (diff)
downloadlinux-64150adf89df2ed165d6760f414fa6df07d22628.tar.xz
s390/cio: Introduce generic synchronous CHSC IOCTL
This patch adds a new ioctl CHSC_START_SYNC that allows to execute any synchronous CHSC that is provided by user space. 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.c37
1 files changed, 35 insertions, 2 deletions
diff --git a/drivers/s390/cio/chsc_sch.c b/drivers/s390/cio/chsc_sch.c
index facdf809113f..190fc844d814 100644
--- a/drivers/s390/cio/chsc_sch.c
+++ b/drivers/s390/cio/chsc_sch.c
@@ -287,11 +287,11 @@ static int chsc_async(struct chsc_async_area *chsc_area,
return ret;
}
-static void chsc_log_command(struct chsc_async_area *chsc_area)
+static void chsc_log_command(void *chsc_area)
{
char dbf[10];
- sprintf(dbf, "CHSC:%x", chsc_area->header.code);
+ sprintf(dbf, "CHSC:%x", ((uint16_t *)chsc_area)[1]);
CHSC_LOG(0, dbf);
CHSC_LOG_HEX(0, chsc_area, 32);
}
@@ -362,6 +362,37 @@ out_free:
return ret;
}
+static int chsc_ioctl_start_sync(void __user *user_area)
+{
+ struct chsc_sync_area *chsc_area;
+ int ret, ccode;
+
+ chsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+ if (!chsc_area)
+ return -ENOMEM;
+ if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
+ ret = -EFAULT;
+ goto out_free;
+ }
+ if (chsc_area->header.code & 0x4000) {
+ ret = -EINVAL;
+ goto out_free;
+ }
+ chsc_log_command(chsc_area);
+ ccode = chsc(chsc_area);
+ if (ccode != 0) {
+ ret = -EIO;
+ goto out_free;
+ }
+ if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
+ ret = -EFAULT;
+ else
+ ret = 0;
+out_free:
+ free_page((unsigned long)chsc_area);
+ return ret;
+}
+
static int chsc_ioctl_info_channel_path(void __user *user_cd)
{
struct chsc_chp_cd *cd;
@@ -795,6 +826,8 @@ static long chsc_ioctl(struct file *filp, unsigned int cmd,
switch (cmd) {
case CHSC_START:
return chsc_ioctl_start(argp);
+ case CHSC_START_SYNC:
+ return chsc_ioctl_start_sync(argp);
case CHSC_INFO_CHANNEL_PATH:
return chsc_ioctl_info_channel_path(argp);
case CHSC_INFO_CU: