[S390] cio: Add chsc subchannel driver.

This patch adds a driver for subchannels of type chsc.

A device /dev/chsc is created which may be used to issue ioctls to:
- obtain information about the machine's I/O configuration
- dynamically change the machine's I/O configuration via
  asynchronous chsc commands

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

1 files changed, 127 insertions, 0 deletions

diff --git a/include/asm-s390/chsc.h b/include/asm-s390/chsc.h
new file mode 100644
index 000000000000..d38d0cf62d4b
--- /dev/null
+++ b/include/asm-s390/chsc.h
@@ -0,0 +1,127 @@
+/*
+ * ioctl interface for /dev/chsc
+ *
+ * Copyright 2008 IBM Corp.
+ * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
+ */
+
+#ifndef _ASM_CHSC_H
+#define _ASM_CHSC_H
+
+#include <asm/chpid.h>
+#include <asm/schid.h>
+
+struct chsc_async_header {
+        __u16 length;
+        __u16 code;
+        __u32 cmd_dependend;
+        __u32 key : 4;
+        __u32 : 28;
+        struct subchannel_id sid;
+} __attribute__ ((packed));
+
+struct chsc_async_area {
+        struct chsc_async_header header;
+        __u8 data[PAGE_SIZE - 16 /* size of chsc_async_header */];
+} __attribute__ ((packed));
+
+
+struct chsc_response_struct {
+        __u16 length;
+        __u16 code;
+        __u32 parms;
+        __u8 data[PAGE_SIZE - 8];
+} __attribute__ ((packed));
+
+struct chsc_chp_cd {
+        struct chp_id chpid;
+        int m;
+        int fmt;
+        struct chsc_response_struct cpcb;
+};
+
+struct chsc_cu_cd {
+        __u16 cun;
+        __u8 cssid;
+        int m;
+        int fmt;
+        struct chsc_response_struct cucb;
+};
+
+struct chsc_sch_cud {
+        struct subchannel_id schid;
+        int fmt;
+        struct chsc_response_struct scub;
+};
+
+struct conf_id {
+        int m;
+        __u8 cssid;
+        __u8 ssid;
+};
+
+struct chsc_conf_info {
+        struct conf_id id;
+        int fmt;
+        struct chsc_response_struct scid;
+};
+
+struct ccl_parm_chpid {
+        int m;
+        struct chp_id chp;
+};
+
+struct ccl_parm_cssids {
+        __u8 f_cssid;
+        __u8 l_cssid;
+};
+
+struct chsc_comp_list {
+        struct {
+                enum {
+                        CCL_CU_ON_CHP = 1,
+                        CCL_CHP_TYPE_CAP = 2,
+                        CCL_CSS_IMG = 4,
+                        CCL_CSS_IMG_CONF_CHAR = 5,
+                        CCL_IOP_CHP = 6,
+                } ctype;
+                int fmt;
+                struct ccl_parm_chpid chpid;
+                struct ccl_parm_cssids cssids;
+        } req;
+        struct chsc_response_struct sccl;
+};
+
+struct chsc_dcal {
+        struct {
+                enum {
+                        DCAL_CSS_IID_PN = 4,
+                } atype;
+                __u32 list_parm[2];
+                int fmt;
+        } req;
+        struct chsc_response_struct sdcal;
+};
+
+struct chsc_cpd_info {
+        struct chp_id chpid;
+        int m;
+        int fmt;
+        int rfmt;
+        int c;
+        struct chsc_response_struct chpdb;
+};
+
+#define CHSC_IOCTL_MAGIC 'c'
+
+#define CHSC_START _IOWR(CHSC_IOCTL_MAGIC, 0x81, struct chsc_async_area)
+#define CHSC_INFO_CHANNEL_PATH _IOWR(CHSC_IOCTL_MAGIC, 0x82, \
+                                    struct chsc_chp_cd)
+#define CHSC_INFO_CU _IOWR(CHSC_IOCTL_MAGIC, 0x83, struct chsc_cu_cd)
+#define CHSC_INFO_SCH_CU _IOWR(CHSC_IOCTL_MAGIC, 0x84, struct chsc_sch_cud)
+#define CHSC_INFO_CI _IOWR(CHSC_IOCTL_MAGIC, 0x85, struct chsc_conf_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)
+
+#endif