diff options
| author |   Michael Holzheu <holzheu@linux.vnet.ibm.com> | 2013-06-06 09:44:28 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-06-26 21:10:10 +0200 |
| commit | 64150adf89df2ed165d6760f414fa6df07d22628 (patch) | |
| tree | faacbf1ffd1daf2aa370d2b4880b8b093ac2966f /drivers/s390 | |
| parent | s390/pci: sysfs remove strlen (diff) | |
| download | linux-dev-64150adf89df2ed165d6760f414fa6df07d22628.tar.xz linux-dev-64150adf89df2ed165d6760f414fa6df07d22628.zip | |
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')
| -rw-r--r-- | drivers/s390/cio/chsc.h | 5 | ||||
| -rw-r--r-- | drivers/s390/cio/chsc_sch.c | 37 |
2 files changed, 35 insertions, 7 deletions
diff --git a/drivers/s390/cio/chsc.h b/drivers/s390/cio/chsc.h index e7ef2a683b8f..62d096f11e65 100644 --- a/drivers/s390/cio/chsc.h +++ b/drivers/s390/cio/chsc.h @@ -10,11 +10,6 @@ #define CHSC_SDA_OC_MSS 0x2 -struct chsc_header { - u16 length; - u16 code; -} __attribute__ ((packed)); - #define NR_MEASUREMENT_CHARS 5 struct cmg_chars { u32 values[NR_MEASUREMENT_CHARS]; 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: |