Auto-update from upstream

5 files changed, 1240 insertions, 0 deletions

diff --git a/arch/s390/hypfs/Makefile b/arch/s390/hypfs/Makefile
new file mode 100644
index 00000000000..f4b00cd81f7
--- /dev/null
+++ b/arch/s390/hypfs/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the linux hypfs filesystem routines.
+#
+
+obj-$(CONFIG_S390_HYPFS_FS) += s390_hypfs.o
+
+s390_hypfs-objs := inode.o hypfs_diag.o
diff --git a/arch/s390/hypfs/hypfs.h b/arch/s390/hypfs/hypfs.h
new file mode 100644
index 00000000000..ea5567be00f
--- /dev/null
+++ b/arch/s390/hypfs/hypfs.h
@@ -0,0 +1,30 @@
+/*
+ *  fs/hypfs/hypfs.h
+ *    Hypervisor filesystem for Linux on s390.
+ *
+ *    Copyright (C) IBM Corp. 2006
+ *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
+ */
+
+#ifndef _HYPFS_H_
+#define _HYPFS_H_
+
+#include <linux/fs.h>
+#include <linux/types.h>
+
+#define REG_FILE_MODE    0440
+#define UPDATE_FILE_MODE 0220
+#define DIR_MODE         0550
+
+extern struct dentry *hypfs_mkdir(struct super_block *sb, struct dentry *parent,
+				  const char *name);
+
+extern struct dentry *hypfs_create_u64(struct super_block *sb,
+				       struct dentry *dir, const char *name,
+				       __u64 value);
+
+extern struct dentry *hypfs_create_str(struct super_block *sb,
+				       struct dentry *dir, const char *name,
+				       char *string);
+
+#endif /* _HYPFS_H_ */
diff --git a/arch/s390/hypfs/hypfs_diag.c b/arch/s390/hypfs/hypfs_diag.c
new file mode 100644
index 00000000000..efa74af7f04
--- /dev/null
+++ b/arch/s390/hypfs/hypfs_diag.c
@@ -0,0 +1,696 @@
+/*
+ *  fs/hypfs/hypfs_diag.c
+ *    Hypervisor filesystem for Linux on s390. Diag 204 and 224
+ *    implementation.
+ *
+ *    Copyright (C) IBM Corp. 2006
+ *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/vmalloc.h>
+#include <asm/ebcdic.h>
+#include "hypfs.h"
+
+#define LPAR_NAME_LEN 8		/* lpar name len in diag 204 data */
+#define CPU_NAME_LEN 16		/* type name len of cpus in diag224 name table */
+#define TMP_SIZE 64		/* size of temporary buffers */
+
+/* diag 204 subcodes */
+enum diag204_sc {
+	SUBC_STIB4 = 4,
+	SUBC_RSI = 5,
+	SUBC_STIB6 = 6,
+	SUBC_STIB7 = 7
+};
+
+/* The two available diag 204 data formats */
+enum diag204_format {
+	INFO_SIMPLE = 0,
+	INFO_EXT = 0x00010000
+};
+
+/* bit is set in flags, when physical cpu info is included in diag 204 data */
+#define LPAR_PHYS_FLG  0x80
+
+static char *diag224_cpu_names;			/* diag 224 name table */
+static enum diag204_sc diag204_store_sc;	/* used subcode for store */
+static enum diag204_format diag204_info_type;	/* used diag 204 data format */
+
+static void *diag204_buf;		/* 4K aligned buffer for diag204 data */
+static void *diag204_buf_vmalloc;	/* vmalloc pointer for diag204 data */
+static int diag204_buf_pages;		/* number of pages for diag204 data */
+
+/*
+ * DIAG 204 data structures and member access functions.
+ *
+ * Since we have two different diag 204 data formats for old and new s390
+ * machines, we do not access the structs directly, but use getter functions for
+ * each struct member instead. This should make the code more readable.
+ */
+
+/* Time information block */
+
+struct info_blk_hdr {
+	__u8  npar;
+	__u8  flags;
+	__u16 tslice;
+	__u16 phys_cpus;
+	__u16 this_part;
+	__u64 curtod;
+} __attribute__ ((packed));
+
+struct x_info_blk_hdr {
+	__u8  npar;
+	__u8  flags;
+	__u16 tslice;
+	__u16 phys_cpus;
+	__u16 this_part;
+	__u64 curtod1;
+	__u64 curtod2;
+	char reserved[40];
+} __attribute__ ((packed));
+
+static inline int info_blk_hdr__size(enum diag204_format type)
+{
+	if (type == INFO_SIMPLE)
+		return sizeof(struct info_blk_hdr);
+	else /* INFO_EXT */
+		return sizeof(struct x_info_blk_hdr);
+}
+
+static inline __u8 info_blk_hdr__npar(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct info_blk_hdr *)hdr)->npar;
+	else /* INFO_EXT */
+		return ((struct x_info_blk_hdr *)hdr)->npar;
+}
+
+static inline __u8 info_blk_hdr__flags(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct info_blk_hdr *)hdr)->flags;
+	else /* INFO_EXT */
+		return ((struct x_info_blk_hdr *)hdr)->flags;
+}
+
+static inline __u16 info_blk_hdr__pcpus(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct info_blk_hdr *)hdr)->phys_cpus;
+	else /* INFO_EXT */
+		return ((struct x_info_blk_hdr *)hdr)->phys_cpus;
+}
+
+/* Partition header */
+
+struct part_hdr {
+	__u8 pn;
+	__u8 cpus;
+	char reserved[6];
+	char part_name[LPAR_NAME_LEN];
+} __attribute__ ((packed));
+
+struct x_part_hdr {
+	__u8  pn;
+	__u8  cpus;
+	__u8  rcpus;
+	__u8  pflag;
+	__u32 mlu;
+	char  part_name[LPAR_NAME_LEN];
+	char  lpc_name[8];
+	char  os_name[8];
+	__u64 online_cs;
+	__u64 online_es;
+	__u8  upid;
+	char  reserved1[3];
+	__u32 group_mlu;
+	char  group_name[8];
+	char  reserved2[32];
+} __attribute__ ((packed));
+
+static inline int part_hdr__size(enum diag204_format type)
+{
+	if (type == INFO_SIMPLE)
+		return sizeof(struct part_hdr);
+	else /* INFO_EXT */
+		return sizeof(struct x_part_hdr);
+}
+
+static inline __u8 part_hdr__rcpus(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct part_hdr *)hdr)->cpus;
+	else /* INFO_EXT */
+		return ((struct x_part_hdr *)hdr)->rcpus;
+}
+
+static inline void part_hdr__part_name(enum diag204_format type, void *hdr,
+				       char *name)
+{
+	if (type == INFO_SIMPLE)
+		memcpy(name, ((struct part_hdr *)hdr)->part_name,
+		       LPAR_NAME_LEN);
+	else /* INFO_EXT */
+		memcpy(name, ((struct x_part_hdr *)hdr)->part_name,
+		       LPAR_NAME_LEN);
+	EBCASC(name, LPAR_NAME_LEN);
+	name[LPAR_NAME_LEN] = 0;
+	strstrip(name);
+}
+
+struct cpu_info {
+	__u16 cpu_addr;
+	char  reserved1[2];
+	__u8  ctidx;
+	__u8  cflag;
+	__u16 weight;
+	__u64 acc_time;
+	__u64 lp_time;
+} __attribute__ ((packed));
+
+struct x_cpu_info {
+	__u16 cpu_addr;
+	char  reserved1[2];
+	__u8  ctidx;
+	__u8  cflag;
+	__u16 weight;
+	__u64 acc_time;
+	__u64 lp_time;
+	__u16 min_weight;
+	__u16 cur_weight;
+	__u16 max_weight;
+	char  reseved2[2];
+	__u64 online_time;
+	__u64 wait_time;
+	__u32 pma_weight;
+	__u32 polar_weight;
+	char  reserved3[40];
+} __attribute__ ((packed));
+
+/* CPU info block */
+
+static inline int cpu_info__size(enum diag204_format type)
+{
+	if (type == INFO_SIMPLE)
+		return sizeof(struct cpu_info);
+	else /* INFO_EXT */
+		return sizeof(struct x_cpu_info);
+}
+
+static inline __u8 cpu_info__ctidx(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct cpu_info *)hdr)->ctidx;
+	else /* INFO_EXT */
+		return ((struct x_cpu_info *)hdr)->ctidx;
+}
+
+static inline __u16 cpu_info__cpu_addr(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct cpu_info *)hdr)->cpu_addr;
+	else /* INFO_EXT */
+		return ((struct x_cpu_info *)hdr)->cpu_addr;
+}
+
+static inline __u64 cpu_info__acc_time(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct cpu_info *)hdr)->acc_time;
+	else /* INFO_EXT */
+		return ((struct x_cpu_info *)hdr)->acc_time;
+}
+
+static inline __u64 cpu_info__lp_time(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct cpu_info *)hdr)->lp_time;
+	else /* INFO_EXT */
+		return ((struct x_cpu_info *)hdr)->lp_time;
+}
+
+static inline __u64 cpu_info__online_time(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return 0;	/* online_time not available in simple info */
+	else /* INFO_EXT */
+		return ((struct x_cpu_info *)hdr)->online_time;
+}
+
+/* Physical header */
+
+struct phys_hdr {
+	char reserved1[1];
+	__u8 cpus;
+	char reserved2[6];
+	char mgm_name[8];
+} __attribute__ ((packed));
+
+struct x_phys_hdr {
+	char reserved1[1];
+	__u8 cpus;
+	char reserved2[6];
+	char mgm_name[8];
+	char reserved3[80];
+} __attribute__ ((packed));
+
+static inline int phys_hdr__size(enum diag204_format type)
+{
+	if (type == INFO_SIMPLE)
+		return sizeof(struct phys_hdr);
+	else /* INFO_EXT */
+		return sizeof(struct x_phys_hdr);
+}
+
+static inline __u8 phys_hdr__cpus(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct phys_hdr *)hdr)->cpus;
+	else /* INFO_EXT */
+		return ((struct x_phys_hdr *)hdr)->cpus;
+}
+
+/* Physical CPU info block */
+
+struct phys_cpu {
+	__u16 cpu_addr;
+	char  reserved1[2];
+	__u8  ctidx;
+	char  reserved2[3];
+	__u64 mgm_time;
+	char  reserved3[8];
+} __attribute__ ((packed));
+
+struct x_phys_cpu {
+	__u16 cpu_addr;
+	char  reserved1[2];
+	__u8  ctidx;
+	char  reserved2[3];
+	__u64 mgm_time;
+	char  reserved3[80];
+} __attribute__ ((packed));
+
+static inline int phys_cpu__size(enum diag204_format type)
+{
+	if (type == INFO_SIMPLE)
+		return sizeof(struct phys_cpu);
+	else /* INFO_EXT */
+		return sizeof(struct x_phys_cpu);
+}
+
+static inline __u16 phys_cpu__cpu_addr(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct phys_cpu *)hdr)->cpu_addr;
+	else /* INFO_EXT */
+		return ((struct x_phys_cpu *)hdr)->cpu_addr;
+}
+
+static inline __u64 phys_cpu__mgm_time(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct phys_cpu *)hdr)->mgm_time;
+	else /* INFO_EXT */
+		return ((struct x_phys_cpu *)hdr)->mgm_time;
+}
+
+static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct phys_cpu *)hdr)->ctidx;
+	else /* INFO_EXT */
+		return ((struct x_phys_cpu *)hdr)->ctidx;
+}
+
+/* Diagnose 204 functions */
+
+static int diag204(unsigned long subcode, unsigned long size, void *addr)
+{
+	register unsigned long _subcode asm("0") = subcode;
+	register unsigned long _size asm("1") = size;
+
+	asm volatile ("   diag    %2,%0,0x204\n"
+		      "0: \n" ".section __ex_table,\"a\"\n"
+#ifndef __s390x__
+		      "    .align 4\n"
+		      "    .long  0b,0b\n"
+#else
+		      "    .align 8\n"
+		      "    .quad  0b,0b\n"
+#endif
+		      ".previous":"+d" (_subcode), "+d"(_size)
+		      :"d"(addr)
+		      :"memory");
+	if (_subcode)
+		return -1;
+	else
+		return _size;
+}
+
+/*
+ * For the old diag subcode 4 with simple data format we have to use real
+ * memory. If we use subcode 6 or 7 with extended data format, we can (and
+ * should) use vmalloc, since we need a lot of memory in that case. Currently
+ * up to 93 pages!
+ */
+
+static void diag204_free_buffer(void)
+{
+	if (!diag204_buf)
+		return;
+	if (diag204_buf_vmalloc) {
+		vfree(diag204_buf_vmalloc);
+		diag204_buf_vmalloc = NULL;
+	} else {
+		free_pages((unsigned long) diag204_buf, 0);
+	}
+	diag204_buf_pages = 0;
+	diag204_buf = NULL;
+}
+
+static void *diag204_alloc_vbuf(int pages)
+{
+	/* The buffer has to be page aligned! */
+	diag204_buf_vmalloc = vmalloc(PAGE_SIZE * (pages + 1));
+	if (!diag204_buf_vmalloc)
+		return ERR_PTR(-ENOMEM);
+	diag204_buf = (void*)((unsigned long)diag204_buf_vmalloc
+				& ~0xfffUL) + 0x1000;
+	diag204_buf_pages = pages;
+	return diag204_buf;
+}
+
+static void *diag204_alloc_rbuf(void)
+{
+	diag204_buf = (void*)__get_free_pages(GFP_KERNEL,0);
+	if (diag204_buf)
+		return ERR_PTR(-ENOMEM);
+	diag204_buf_pages = 1;
+	return diag204_buf;
+}
+
+static void *diag204_get_buffer(enum diag204_format fmt, int *pages)
+{
+	if (diag204_buf) {
+		*pages = diag204_buf_pages;
+		return diag204_buf;
+	}
+	if (fmt == INFO_SIMPLE) {
+		*pages = 1;
+		return diag204_alloc_rbuf();
+	} else {/* INFO_EXT */
+		*pages = diag204(SUBC_RSI | INFO_EXT, 0, 0);
+		if (*pages <= 0)
+			return ERR_PTR(-ENOSYS);
+		else
+			return diag204_alloc_vbuf(*pages);
+	}
+}
+
+/*
+ * diag204_probe() has to find out, which type of diagnose 204 implementation
+ * we have on our machine. Currently there are three possible scanarios:
+ *   - subcode 4   + simple data format (only one page)
+ *   - subcode 4-6 + extended data format
+ *   - subcode 4-7 + extended data format
+ *
+ * Subcode 5 is used to retrieve the size of the data, provided by subcodes
+ * 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition
+ * to subcode 6 it provides also information about secondary cpus.
+ * In order to get as much information as possible, we first try
+ * subcode 7, then 6 and if both fail, we use subcode 4.
+ */
+
+static int diag204_probe(void)
+{
+	void *buf;
+	int pages, rc;
+
+	buf = diag204_get_buffer(INFO_EXT, &pages);
+	if (!IS_ERR(buf)) {
+		if (diag204(SUBC_STIB7 | INFO_EXT, pages, buf) >= 0) {
+			diag204_store_sc = SUBC_STIB7;
+			diag204_info_type = INFO_EXT;
+			goto out;
+		}
+		if (diag204(SUBC_STIB6 | INFO_EXT, pages, buf) >= 0) {
+			diag204_store_sc = SUBC_STIB7;
+			diag204_info_type = INFO_EXT;
+			goto out;
+		}
+		diag204_free_buffer();
+	}
+
+	/* subcodes 6 and 7 failed, now try subcode 4 */
+
+	buf = diag204_get_buffer(INFO_SIMPLE, &pages);
+	if (IS_ERR(buf)) {
+		rc = PTR_ERR(buf);
+		goto fail_alloc;
+	}
+	if (diag204(SUBC_STIB4 | INFO_SIMPLE, pages, buf) >= 0) {
+		diag204_store_sc = SUBC_STIB4;
+		diag204_info_type = INFO_SIMPLE;
+		goto out;
+	} else {
+		rc = -ENOSYS;
+		goto fail_store;
+	}
+out:
+	rc = 0;
+fail_store:
+	diag204_free_buffer();
+fail_alloc:
+	return rc;
+}
+
+static void *diag204_store(void)
+{
+	void *buf;
+	int pages;
+
+	buf = diag204_get_buffer(diag204_info_type, &pages);
+	if (IS_ERR(buf))
+		goto out;
+	if (diag204(diag204_store_sc | diag204_info_type, pages, buf) < 0)
+		return ERR_PTR(-ENOSYS);
+out:
+	return buf;
+}
+
+/* Diagnose 224 functions */
+
+static void diag224(void *ptr)
+{
+	asm volatile("   diag    %0,%1,0x224\n"
+		     : :"d" (0), "d"(ptr) : "memory");
+}
+
+static int diag224_get_name_table(void)
+{
+	/* memory must be below 2GB */
+	diag224_cpu_names = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
+	if (!diag224_cpu_names)
+		return -ENOMEM;
+	diag224(diag224_cpu_names);
+	EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16);
+	return 0;
+}
+
+static void diag224_delete_name_table(void)
+{
+	kfree(diag224_cpu_names);
+}
+
+static int diag224_idx2name(int index, char *name)
+{
+	memcpy(name, diag224_cpu_names + ((index + 1) * CPU_NAME_LEN),
+		CPU_NAME_LEN);
+	name[CPU_NAME_LEN] = 0;
+	strstrip(name);
+	return 0;
+}
+
+__init int hypfs_diag_init(void)
+{
+	int rc;
+
+	if (diag204_probe()) {
+		printk(KERN_ERR "hypfs: diag 204 not working.");
+		return -ENODATA;
+	}
+	rc = diag224_get_name_table();
+	if (rc) {
+		diag224_delete_name_table();
+		printk(KERN_ERR "hypfs: could not get name table.\n");
+	}
+	return rc;
+}
+
+__exit void hypfs_diag_exit(void)
+{
+	diag224_delete_name_table();
+	diag204_free_buffer();
+}
+
+/*
+ * Functions to create the directory structure
+ * *******************************************
+ */
+
+static int hypfs_create_cpu_files(struct super_block *sb,
+				  struct dentry *cpus_dir, void *cpu_info)
+{
+	struct dentry *cpu_dir;
+	char buffer[TMP_SIZE];
+	void *rc;
+
+	snprintf(buffer, TMP_SIZE, "%d", cpu_info__cpu_addr(diag204_info_type,
+							    cpu_info));
+	cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
+	rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
+			      cpu_info__acc_time(diag204_info_type, cpu_info) -
+			      cpu_info__lp_time(diag204_info_type, cpu_info));
+	if (IS_ERR(rc))
+		return PTR_ERR(rc);
+	rc = hypfs_create_u64(sb, cpu_dir, "cputime",
+			      cpu_info__lp_time(diag204_info_type, cpu_info));
+	if (IS_ERR(rc))
+		return PTR_ERR(rc);
+	if (diag204_info_type == INFO_EXT) {
+		rc = hypfs_create_u64(sb, cpu_dir, "onlinetime",
+				      cpu_info__online_time(diag204_info_type,
+							    cpu_info));
+		if (IS_ERR(rc))
+			return PTR_ERR(rc);
+	}
+	diag224_idx2name(cpu_info__ctidx(diag204_info_type, cpu_info), buffer);
+	rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
+	if (IS_ERR(rc))
+		return PTR_ERR(rc);
+	return 0;
+}
+
+static void *hypfs_create_lpar_files(struct super_block *sb,
+				     struct dentry *systems_dir, void *part_hdr)
+{
+	struct dentry *cpus_dir;
+	struct dentry *lpar_dir;
+	char lpar_name[LPAR_NAME_LEN + 1];
+	void *cpu_info;
+	int i;
+
+	part_hdr__part_name(diag204_info_type, part_hdr, lpar_name);
+	lpar_name[LPAR_NAME_LEN] = 0;
+	lpar_dir = hypfs_mkdir(sb, systems_dir, lpar_name);
+	if (IS_ERR(lpar_dir))
+		return lpar_dir;
+	cpus_dir = hypfs_mkdir(sb, lpar_dir, "cpus");
+	if (IS_ERR(cpus_dir))
+		return cpus_dir;
+	cpu_info = part_hdr + part_hdr__size(diag204_info_type);
+	for (i = 0; i < part_hdr__rcpus(diag204_info_type, part_hdr); i++) {
+		int rc;
+		rc = hypfs_create_cpu_files(sb, cpus_dir, cpu_info);
+		if (rc)
+			return ERR_PTR(rc);
+		cpu_info += cpu_info__size(diag204_info_type);
+	}
+	return cpu_info;
+}
+
+static int hypfs_create_phys_cpu_files(struct super_block *sb,
+				       struct dentry *cpus_dir, void *cpu_info)
+{
+	struct dentry *cpu_dir;
+	char buffer[TMP_SIZE];
+	void *rc;
+
+	snprintf(buffer, TMP_SIZE, "%i", phys_cpu__cpu_addr(diag204_info_type,
+							    cpu_info));
+	cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
+	if (IS_ERR(cpu_dir))
+		return PTR_ERR(cpu_dir);
+	rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
+			      phys_cpu__mgm_time(diag204_info_type, cpu_info));
+	if (IS_ERR(rc))
+		return PTR_ERR(rc);
+	diag224_idx2name(phys_cpu__ctidx(diag204_info_type, cpu_info), buffer);
+	rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
+	if (IS_ERR(rc))
+		return PTR_ERR(rc);
+	return 0;
+}
+
+static void *hypfs_create_phys_files(struct super_block *sb,
+				     struct dentry *parent_dir, void *phys_hdr)
+{
+	int i;
+	void *cpu_info;
+	struct dentry *cpus_dir;
+
+	cpus_dir = hypfs_mkdir(sb, parent_dir, "cpus");
+	if (IS_ERR(cpus_dir))
+		return cpus_dir;
+	cpu_info = phys_hdr + phys_hdr__size(diag204_info_type);
+	for (i = 0; i < phys_hdr__cpus(diag204_info_type, phys_hdr); i++) {
+		int rc;
+		rc = hypfs_create_phys_cpu_files(sb, cpus_dir, cpu_info);
+		if (rc)
+			return ERR_PTR(rc);
+		cpu_info += phys_cpu__size(diag204_info_type);
+	}
+	return cpu_info;
+}
+
+int hypfs_diag_create_files(struct super_block *sb, struct dentry *root)
+{
+	struct dentry *systems_dir, *hyp_dir;
+	void *time_hdr, *part_hdr;
+	int i, rc;
+	void *buffer, *ptr;
+
+	buffer = diag204_store();
+	if (IS_ERR(buffer))
+		return PTR_ERR(buffer);
+
+	systems_dir = hypfs_mkdir(sb, root, "systems");
+	if (IS_ERR(systems_dir)) {
+		rc = PTR_ERR(systems_dir);
+		goto err_out;
+	}
+	time_hdr = (struct x_info_blk_hdr *)buffer;
+	part_hdr = time_hdr + info_blk_hdr__size(diag204_info_type);
+	for (i = 0; i < info_blk_hdr__npar(diag204_info_type, time_hdr); i++) {
+		part_hdr = hypfs_create_lpar_files(sb, systems_dir, part_hdr);
+		if (IS_ERR(part_hdr)) {
+			rc = PTR_ERR(part_hdr);
+			goto err_out;
+		}
+	}
+	if (info_blk_hdr__flags(diag204_info_type, time_hdr) & LPAR_PHYS_FLG) {
+		ptr = hypfs_create_phys_files(sb, root, part_hdr);
+		if (IS_ERR(ptr)) {
+			rc = PTR_ERR(ptr);
+			goto err_out;
+		}
+	}
+	hyp_dir = hypfs_mkdir(sb, root, "hyp");
+	if (IS_ERR(hyp_dir)) {
+		rc = PTR_ERR(hyp_dir);
+		goto err_out;
+	}
+	ptr = hypfs_create_str(sb, hyp_dir, "type", "LPAR Hypervisor");
+	if (IS_ERR(ptr)) {
+		rc = PTR_ERR(ptr);
+		goto err_out;
+	}
+	rc = 0;
+
+err_out:
+	return rc;
+}
diff --git a/arch/s390/hypfs/hypfs_diag.h b/arch/s390/hypfs/hypfs_diag.h
new file mode 100644
index 00000000000..793dea6b9bb
--- /dev/null
+++ b/arch/s390/hypfs/hypfs_diag.h
@@ -0,0 +1,16 @@
+/*
+ *  fs/hypfs/hypfs_diag.h
+ *    Hypervisor filesystem for Linux on s390.
+ *
+ *    Copyright (C) IBM Corp. 2006
+ *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
+ */
+
+#ifndef _HYPFS_DIAG_H_
+#define _HYPFS_DIAG_H_
+
+extern int hypfs_diag_init(void);
+extern void hypfs_diag_exit(void);
+extern int hypfs_diag_create_files(struct super_block *sb, struct dentry *root);
+
+#endif /* _HYPFS_DIAG_H_ */
diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c
new file mode 100644
index 00000000000..18c091925ea
--- /dev/null
+++ b/arch/s390/hypfs/inode.c
@@ -0,0 +1,491 @@
+/*
+ *  fs/hypfs/inode.c
+ *    Hypervisor filesystem for Linux on s390.
+ *
+ *    Copyright (C) IBM Corp. 2006
+ *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/vfs.h>
+#include <linux/pagemap.h>
+#include <linux/gfp.h>
+#include <linux/time.h>
+#include <linux/parser.h>
+#include <linux/sysfs.h>
+#include <linux/module.h>
+#include <asm/ebcdic.h>
+#include "hypfs.h"
+#include "hypfs_diag.h"
+
+#define HYPFS_MAGIC 0x687970	/* ASCII 'hyp' */
+#define TMP_SIZE 64		/* size of temporary buffers */
+
+static struct dentry *hypfs_create_update_file(struct super_block *sb,
+					       struct dentry *dir);
+
+struct hypfs_sb_info {
+	uid_t uid;			/* uid used for files and dirs */
+	gid_t gid;			/* gid used for files and dirs */
+	struct dentry *update_file;	/* file to trigger update */
+	time_t last_update;		/* last update time in secs since 1970 */
+	struct mutex lock;		/* lock to protect update process */
+};
+
+static struct file_operations hypfs_file_ops;
+static struct file_system_type hypfs_type;
+static struct super_operations hypfs_s_ops;
+
+/* start of list of all dentries, which have to be deleted on update */
+static struct dentry *hypfs_last_dentry;
+
+static void hypfs_update_update(struct super_block *sb)
+{
+	struct hypfs_sb_info *sb_info = sb->s_fs_info;
+	struct inode *inode = sb_info->update_file->d_inode;
+
+	sb_info->last_update = get_seconds();
+	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+}
+
+/* directory tree removal functions */
+
+static void hypfs_add_dentry(struct dentry *dentry)
+{
+	dentry->d_fsdata = hypfs_last_dentry;
+	hypfs_last_dentry = dentry;
+}
+
+static void hypfs_remove(struct dentry *dentry)
+{
+	struct dentry *parent;
+
+	parent = dentry->d_parent;
+	if (S_ISDIR(dentry->d_inode->i_mode))
+		simple_rmdir(parent->d_inode, dentry);
+	else
+		simple_unlink(parent->d_inode, dentry);
+	d_delete(dentry);
+	dput(dentry);
+}
+
+static void hypfs_delete_tree(struct dentry *root)
+{
+	while (hypfs_last_dentry) {
+		struct dentry *next_dentry;
+		next_dentry = hypfs_last_dentry->d_fsdata;
+		hypfs_remove(hypfs_last_dentry);
+		hypfs_last_dentry = next_dentry;
+	}
+}
+
+static struct inode *hypfs_make_inode(struct super_block *sb, int mode)
+{
+	struct inode *ret = new_inode(sb);
+
+	if (ret) {
+		struct hypfs_sb_info *hypfs_info = sb->s_fs_info;
+		ret->i_mode = mode;
+		ret->i_uid = hypfs_info->uid;
+		ret->i_gid = hypfs_info->gid;
+		ret->i_blksize = PAGE_CACHE_SIZE;
+		ret->i_blocks = 0;
+		ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
+		if (mode & S_IFDIR)
+			ret->i_nlink = 2;
+		else
+			ret->i_nlink = 1;
+	}
+	return ret;
+}
+
+static void hypfs_drop_inode(struct inode *inode)
+{
+	kfree(inode->u.generic_ip);
+	generic_delete_inode(inode);
+}
+
+static int hypfs_open(struct inode *inode, struct file *filp)
+{
+	char *data = filp->f_dentry->d_inode->u.generic_ip;
+	struct hypfs_sb_info *fs_info;
+
+	if (filp->f_mode & FMODE_WRITE) {
+		if (!(inode->i_mode & S_IWUGO))
+			return -EACCES;
+	}
+	if (filp->f_mode & FMODE_READ) {
+		if (!(inode->i_mode & S_IRUGO))
+			return -EACCES;
+	}
+
+	fs_info = inode->i_sb->s_fs_info;
+	if(data) {
+		mutex_lock(&fs_info->lock);
+		filp->private_data = kstrdup(data, GFP_KERNEL);
+		if (!filp->private_data) {
+			mutex_unlock(&fs_info->lock);
+			return -ENOMEM;
+		}
+		mutex_unlock(&fs_info->lock);
+	}
+	return 0;
+}
+
+static ssize_t hypfs_aio_read(struct kiocb *iocb, __user char *buf,
+			      size_t count, loff_t offset)
+{
+	char *data;
+	size_t len;
+	struct file *filp = iocb->ki_filp;
+
+	data = filp->private_data;
+	len = strlen(data);
+	if (offset > len) {
+		count = 0;
+		goto out;
+	}
+	if (count > len - offset)
+		count = len - offset;
+	if (copy_to_user(buf, data + offset, count)) {
+		count = -EFAULT;
+		goto out;
+	}
+	iocb->ki_pos += count;
+	file_accessed(filp);
+out:
+	return count;
+}
+static ssize_t hypfs_aio_write(struct kiocb *iocb, const char __user *buf,
+			       size_t count, loff_t pos)
+{
+	int rc;
+	struct super_block *sb;
+	struct hypfs_sb_info *fs_info;
+
+	sb = iocb->ki_filp->f_dentry->d_inode->i_sb;
+	fs_info = sb->s_fs_info;
+	/*
+	 * Currently we only allow one update per second for two reasons:
+	 * 1. diag 204 is VERY expensive
+	 * 2. If several processes do updates in parallel and then read the
+	 *    hypfs data, the likelihood of collisions is reduced, if we restrict
+	 *    the minimum update interval. A collision occurs, if during the
+	 *    data gathering of one process another process triggers an update
+	 *    If the first process wants to ensure consistent data, it has
+	 *    to restart data collection in this case.
+	 */
+	mutex_lock(&fs_info->lock);
+	if (fs_info->last_update == get_seconds()) {
+		rc = -EBUSY;
+		goto out;
+	}
+	hypfs_delete_tree(sb->s_root);
+	rc = hypfs_diag_create_files(sb, sb->s_root);
+	if (rc) {
+		printk(KERN_ERR "hypfs: Update failed\n");
+		hypfs_delete_tree(sb->s_root);
+		goto out;
+	}
+	hypfs_update_update(sb);
+	rc = count;
+out:
+	mutex_unlock(&fs_info->lock);
+	return rc;
+}
+
+static int hypfs_release(struct inode *inode, struct file *filp)
+{
+	kfree(filp->private_data);
+	return 0;
+}
+
+enum { opt_uid, opt_gid, opt_err };
+
+static match_table_t hypfs_tokens = {
+	{opt_uid, "uid=%u"},
+	{opt_gid, "gid=%u"},
+	{opt_err, NULL}
+};
+
+static int hypfs_parse_options(char *options, struct super_block *sb)
+{
+	char *str;
+	substring_t args[MAX_OPT_ARGS];
+
+	if (!options)
+		return 0;
+	while ((str = strsep(&options, ",")) != NULL) {
+		int token, option;
+		struct hypfs_sb_info *hypfs_info = sb->s_fs_info;
+
+		if (!*str)
+			continue;
+		token = match_token(str, hypfs_tokens, args);
+		switch (token) {
+		case opt_uid:
+			if (match_int(&args[0], &option))
+				return -EINVAL;
+			hypfs_info->uid = option;
+			break;
+		case opt_gid:
+			if (match_int(&args[0], &option))
+				return -EINVAL;
+			hypfs_info->gid = option;
+			break;
+		case opt_err:
+		default:
+			printk(KERN_ERR "hypfs: Unrecognized mount option "
+			       "\"%s\" or missing value\n", str);
+			return -EINVAL;
+		}
+	}
+	return 0;
+}
+
+static int hypfs_fill_super(struct super_block *sb, void *data, int silent)
+{
+	struct inode *root_inode;
+	struct dentry *root_dentry;
+	int rc = 0;
+	struct hypfs_sb_info *sbi;
+
+	sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL);
+	if (!sbi)
+		return -ENOMEM;
+	mutex_init(&sbi->lock);
+	sbi->uid = current->uid;
+	sbi->gid = current->gid;
+	sb->s_fs_info = sbi;
+	sb->s_blocksize = PAGE_CACHE_SIZE;
+	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+	sb->s_magic = HYPFS_MAGIC;
+	sb->s_op = &hypfs_s_ops;
+	if (hypfs_parse_options(data, sb)) {
+		rc = -EINVAL;
+		goto err_alloc;
+	}
+	root_inode = hypfs_make_inode(sb, S_IFDIR | 0755);
+	if (!root_inode) {
+		rc = -ENOMEM;
+		goto err_alloc;
+	}
+	root_inode->i_op = &simple_dir_inode_operations;
+	root_inode->i_fop = &simple_dir_operations;
+	root_dentry = d_alloc_root(root_inode);
+	if (!root_dentry) {
+		iput(root_inode);
+		rc = -ENOMEM;
+		goto err_alloc;
+	}
+	rc = hypfs_diag_create_files(sb, root_dentry);
+	if (rc)
+		goto err_tree;
+	sbi->update_file = hypfs_create_update_file(sb, root_dentry);
+	if (IS_ERR(sbi->update_file)) {
+		rc = PTR_ERR(sbi->update_file);
+		goto err_tree;
+	}
+	hypfs_update_update(sb);
+	sb->s_root = root_dentry;
+	return 0;
+
+err_tree:
+	hypfs_delete_tree(root_dentry);
+	d_genocide(root_dentry);
+	dput(root_dentry);
+err_alloc:
+	kfree(sbi);
+	return rc;
+}
+
+static int hypfs_get_super(struct file_system_type *fst, int flags,
+			const char *devname, void *data, struct vfsmount *mnt)
+{
+	return get_sb_single(fst, flags, data, hypfs_fill_super, mnt);
+}
+
+static void hypfs_kill_super(struct super_block *sb)
+{
+	struct hypfs_sb_info *sb_info = sb->s_fs_info;
+
+	hypfs_delete_tree(sb->s_root);
+	hypfs_remove(sb_info->update_file);
+	kfree(sb->s_fs_info);
+	sb->s_fs_info = NULL;
+	kill_litter_super(sb);
+}
+
+static struct dentry *hypfs_create_file(struct super_block *sb,
+					struct dentry *parent, const char *name,
+					char *data, mode_t mode)
+{
+	struct dentry *dentry;
+	struct inode *inode;
+	struct qstr qname;
+
+	qname.name = name;
+	qname.len = strlen(name);
+	qname.hash = full_name_hash(name, qname.len);
+	dentry = lookup_one_len(name, parent, strlen(name));
+	if (IS_ERR(dentry))
+		return ERR_PTR(-ENOMEM);
+	inode = hypfs_make_inode(sb, mode);
+	if (!inode) {
+		dput(dentry);
+		return ERR_PTR(-ENOMEM);
+	}
+	if (mode & S_IFREG) {
+		inode->i_fop = &hypfs_file_ops;
+		if (data)
+			inode->i_size = strlen(data);
+		else
+			inode->i_size = 0;
+	} else if (mode & S_IFDIR) {
+		inode->i_op = &simple_dir_inode_operations;
+		inode->i_fop = &simple_dir_operations;
+		parent->d_inode->i_nlink++;
+	} else
+		BUG();
+	inode->u.generic_ip = data;
+	d_instantiate(dentry, inode);
+	dget(dentry);
+	return dentry;
+}
+
+struct dentry *hypfs_mkdir(struct super_block *sb, struct dentry *parent,
+			   const char *name)
+{
+	struct dentry *dentry;
+
+	dentry = hypfs_create_file(sb, parent, name, NULL, S_IFDIR | DIR_MODE);
+	if (IS_ERR(dentry))
+		return dentry;
+	hypfs_add_dentry(dentry);
+	parent->d_inode->i_nlink++;
+	return dentry;
+}
+
+static struct dentry *hypfs_create_update_file(struct super_block *sb,
+					       struct dentry *dir)
+{
+	struct dentry *dentry;
+
+	dentry = hypfs_create_file(sb, dir, "update", NULL,
+				   S_IFREG | UPDATE_FILE_MODE);
+	/*
+	 * We do not put the update file on the 'delete' list with
+	 * hypfs_add_dentry(), since it should not be removed when the tree
+	 * is updated.
+	 */
+	return dentry;
+}
+
+struct dentry *hypfs_create_u64(struct super_block *sb, struct dentry *dir,
+				const char *name, __u64 value)
+{
+	char *buffer;
+	char tmp[TMP_SIZE];
+	struct dentry *dentry;
+
+	snprintf(tmp, TMP_SIZE, "%lld\n", (unsigned long long int)value);
+	buffer = kstrdup(tmp, GFP_KERNEL);
+	if (!buffer)
+		return ERR_PTR(-ENOMEM);
+	dentry =
+	    hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE);
+	if (IS_ERR(dentry)) {
+		kfree(buffer);
+		return ERR_PTR(-ENOMEM);
+	}
+	hypfs_add_dentry(dentry);
+	return dentry;
+}
+
+struct dentry *hypfs_create_str(struct super_block *sb, struct dentry *dir,
+				const char *name, char *string)
+{
+	char *buffer;
+	struct dentry *dentry;
+
+	buffer = kmalloc(strlen(string) + 2, GFP_KERNEL);
+	if (!buffer)
+		return ERR_PTR(-ENOMEM);
+	sprintf(buffer, "%s\n", string);
+	dentry =
+	    hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE);
+	if (IS_ERR(dentry)) {
+		kfree(buffer);
+		return ERR_PTR(-ENOMEM);
+	}
+	hypfs_add_dentry(dentry);
+	return dentry;
+}
+
+static struct file_operations hypfs_file_ops = {
+	.open		= hypfs_open,
+	.release	= hypfs_release,
+	.read		= do_sync_read,
+	.write		= do_sync_write,
+	.aio_read	= hypfs_aio_read,
+	.aio_write	= hypfs_aio_write,
+};
+
+static struct file_system_type hypfs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "s390_hypfs",
+	.get_sb		= hypfs_get_super,
+	.kill_sb	= hypfs_kill_super
+};
+
+static struct super_operations hypfs_s_ops = {
+	.statfs		= simple_statfs,
+	.drop_inode	= hypfs_drop_inode,
+};
+
+static decl_subsys(s390, NULL, NULL);
+
+static int __init hypfs_init(void)
+{
+	int rc;
+
+	if (MACHINE_IS_VM)
+		return -ENODATA;
+	if (hypfs_diag_init()) {
+		rc = -ENODATA;
+		goto fail_diag;
+	}
+	kset_set_kset_s(&s390_subsys, hypervisor_subsys);
+	rc = subsystem_register(&s390_subsys);
+	if (rc)
+		goto fail_sysfs;
+	rc = register_filesystem(&hypfs_type);
+	if (rc)
+		goto fail_filesystem;
+	return 0;
+
+fail_filesystem:
+	subsystem_unregister(&s390_subsys);
+fail_sysfs:
+	hypfs_diag_exit();
+fail_diag:
+	printk(KERN_ERR "hypfs: Initialization failed with rc = %i.\n", rc);
+	return rc;
+}
+
+static void __exit hypfs_exit(void)
+{
+	hypfs_diag_exit();
+	unregister_filesystem(&hypfs_type);
+	subsystem_unregister(&s390_subsys);
+}
+
+module_init(hypfs_init)
+module_exit(hypfs_exit)
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Michael Holzheu <holzheu@de.ibm.com>");
+MODULE_DESCRIPTION("s390 Hypervisor Filesystem");