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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>
This commit is contained in:
Michael Holzheu 2013-06-06 09:44:28 +02:00 committed by Martin Schwidefsky
parent 80b054ba2a
commit 64150adf89
3 changed files with 46 additions and 7 deletions
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11
arch/s390/include/uapi/asm/chsc.h
View File

@ -29,6 +29,16 @@ struct chsc_async_area {
__u8 data[CHSC_SIZE - sizeof(struct chsc_async_header)];
} __attribute__ ((packed));
struct chsc_header {
__u16 length;
__u16 code;
} __attribute__ ((packed));
struct chsc_sync_area {
struct chsc_header header;
__u8 data[CHSC_SIZE - sizeof(struct chsc_header)];
} __attribute__ ((packed));
struct chsc_response_struct {
__u16 length;
__u16 code;
@ -126,5 +136,6 @@ struct chsc_cpd_info {
#define CHSC_INFO_CCL _IOWR(CHSC_IOCTL_MAGIC, 0x86, struct chsc_comp_list)
#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)
#endif

5
drivers/s390/cio/chsc.h
View File

@ -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];

37
drivers/s390/cio/chsc_sch.c
View File

@ -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: