s390/pci: add ioctl interface for CLP

Provide a user space interface to issue call logical-processor instructions.
Only selected CLP commands are allowed, enough to get the full overview of
the installed PCI functions.

Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

3 files changed, 58 insertions, 27 deletions

diff --git a/arch/s390/include/asm/clp.h b/arch/s390/include/asm/clp.h
index a0e71a5..5687d62 100644
--- a/arch/s390/include/asm/clp.h
+++ b/arch/s390/include/asm/clp.h
@@ -4,14 +4,23 @@
 /* CLP common request & response block size */
 #define CLP_BLK_SIZE			PAGE_SIZE
 
+#define CLP_LPS_BASE	0
+#define CLP_LPS_PCI	2
+
 struct clp_req_hdr {
 	u16 len;
 	u16 cmd;
+	u32 fmt		: 4;
+	u32 reserved1	: 28;
+	u64 reserved2;
 } __packed;
 
 struct clp_rsp_hdr {
 	u16 len;
 	u16 rsp;
+	u32 fmt		: 4;
+	u32 reserved1	: 28;
+	u64 reserved2;
 } __packed;
 
 /* CLP Response Codes */
@@ -25,4 +34,22 @@ struct clp_rsp_hdr {
 #define CLP_RC_NODATA			0x0080	/* No data available */
 #define CLP_RC_FC_UNKNOWN		0x0100	/* Function code not recognized */
 
+/* Store logical-processor characteristics request */
+struct clp_req_slpc {
+	struct clp_req_hdr hdr;
+} __packed;
+
+struct clp_rsp_slpc {
+	struct clp_rsp_hdr hdr;
+	u32 reserved2[4];
+	u32 lpif[8];
+	u32 reserved3[8];
+	u32 lpic[8];
+} __packed;
+
+struct clp_req_rsp_slpc {
+	struct clp_req_slpc request;
+	struct clp_rsp_slpc response;
+} __packed;
+
 #endif
diff --git a/arch/s390/include/asm/pci_clp.h b/arch/s390/include/asm/pci_clp.h
index dd78f92..e75c64cb 100644
--- a/arch/s390/include/asm/pci_clp.h
+++ b/arch/s390/include/asm/pci_clp.h
@@ -49,9 +49,6 @@ struct clp_fh_list_entry {
 /* List PCI functions request */
 struct clp_req_list_pci {
 	struct clp_req_hdr hdr;
-	u32 fmt			:  4;	/* cmd request block format */
-	u32			: 28;
-	u64 reserved1;
 	u64 resume_token;
 	u64 reserved2;
 } __packed;
@@ -59,9 +56,6 @@ struct clp_req_list_pci {
 /* List PCI functions response */
 struct clp_rsp_list_pci {
 	struct clp_rsp_hdr hdr;
-	u32 fmt			:  4;	/* cmd request block format */
-	u32			: 28;
-	u64 reserved1;
 	u64 resume_token;
 	u32 reserved2;
 	u16 max_fn;
@@ -73,9 +67,6 @@ struct clp_rsp_list_pci {
 /* Query PCI function request */
 struct clp_req_query_pci {
 	struct clp_req_hdr hdr;
-	u32 fmt			:  4;	/* cmd request block format */
-	u32			: 28;
-	u64 reserved1;
 	u32 fh;				/* function handle */
 	u32 reserved2;
 	u64 reserved3;
@@ -84,9 +75,6 @@ struct clp_req_query_pci {
 /* Query PCI function response */
 struct clp_rsp_query_pci {
 	struct clp_rsp_hdr hdr;
-	u32 fmt			:  4;	/* cmd request block format */
-	u32			: 28;
-	u64			: 64;
 	u16 vfn;			/* virtual fn number */
 	u16			:  7;
 	u16 util_str_avail	:  1;	/* utility string available? */
@@ -108,21 +96,15 @@ struct clp_rsp_query_pci {
 /* Query PCI function group request */
 struct clp_req_query_pci_grp {
 	struct clp_req_hdr hdr;
-	u32 fmt			:  4;	/* cmd request block format */
-	u32			: 28;
-	u64 reserved1;
-	u32			: 24;
+	u32 reserved2		: 24;
 	u32 pfgid		:  8;	/* function group id */
-	u32 reserved2;
-	u64 reserved3;
+	u32 reserved3;
+	u64 reserved4;
 } __packed;
 
 /* Query PCI function group response */
 struct clp_rsp_query_pci_grp {
 	struct clp_rsp_hdr hdr;
-	u32 fmt			:  4;	/* cmd request block format */
-	u32			: 28;
-	u64 reserved1;
 	u16			:  4;
 	u16 noi			: 12;	/* number of interrupts */
 	u8 version;
@@ -141,9 +123,6 @@ struct clp_rsp_query_pci_grp {
 /* Set PCI function request */
 struct clp_req_set_pci {
 	struct clp_req_hdr hdr;
-	u32 fmt			:  4;	/* cmd request block format */
-	u32			: 28;
-	u64 reserved1;
 	u32 fh;				/* function handle */
 	u16 reserved2;
 	u8 oc;				/* operation controls */
@@ -154,9 +133,6 @@ struct clp_req_set_pci {
 /* Set PCI function response */
 struct clp_rsp_set_pci {
 	struct clp_rsp_hdr hdr;
-	u32 fmt			:  4;	/* cmd request block format */
-	u32			: 28;
-	u64 reserved1;
 	u32 fh;				/* function handle */
 	u32 reserved3;
 	u64 reserved4;
diff --git a/arch/s390/include/uapi/asm/clp.h b/arch/s390/include/uapi/asm/clp.h
new file mode 100644
index 0000000..ab72d9d
--- /dev/null
+++ b/arch/s390/include/uapi/asm/clp.h
@@ -0,0 +1,28 @@
+/*
+ * ioctl interface for /dev/clp
+ *
+ * Copyright IBM Corp. 2016
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#ifndef _ASM_CLP_H
+#define _ASM_CLP_H
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+struct clp_req {
+	unsigned int c : 1;
+	unsigned int r : 1;
+	unsigned int lps : 6;
+	unsigned int cmd : 8;
+	unsigned int : 16;
+	unsigned int reserved;
+	__u64 data_p;
+};
+
+#define CLP_IOCTL_MAGIC 'c'
+
+#define CLP_SYNC _IOWR(CLP_IOCTL_MAGIC, 0xC1, struct clp_req)
+
+#endif