From: [email protected]
On zSeries machines there exists an interface which allows the operating
system to retrieve LPAR hypervisor accounting data. For example, it is
possible to get usage data for physical and virtual cpus. In order to
provide this information to user space programs, I implemented a new
virtual Linux file system named 'hypfs' using the Linux 2.6 libfs
framework. The name 'hypfs' stands for 'Hypervisor Filesystem'. All the
accounting information is put into different virtual files which can be
accessed from user space. All data is represented as ASCII strings.
When the file system is mounted the accounting information is retrieved
and a file system tree is created with the attribute files containing
the cpu information. The content of the files remains unchanged until a
new update is made. An update can be triggered from user space through
writing 'something' into a special purpose update file.
Regarding the mount point I am not sure what to use. Currently I would
suggest /sys/hypervisor. Any better ideas for the mount point?
Currently this is a zSeries specific solution but if other
virtualization platforms like e.g. Xen are interested in exporting
hypervisor data to user space, we can think of a more generic approach.
We create the following directory structure:
<mount-point>/
update
cpus/
<cpu-id>
type
mgmtime
<cpu-id>
...
hyp/
type
systems/
<lpar-name>
cpus/
<cpu-id>
type
mgmtime
cputime
onlinetime
<cpu-id>
...
<lpar-name>
cpus/
...
- update: Time of last update in seconds since 1970.
- cpus/: Directory for all physical cpus
- cpus/<cpu-id>/: Directory for one physical cpu. <cpu-id> is a logical
(decimal) cpu number
- cpus/<cpu-id>/type: Type name of physical zSeries cpu.
- cpus/<cpu-id>/mgmtime: Physical-LPAR-management time in microseconds.
- hyp/: Directory for hypervisor information
- hyp/type: Type of hypervisor (currently only 'LPAR Hypervisor')
- systems/: Directory for all LPARs
- systems/<lpar-name>/: Directory for one LPAR.
- systems/<lpar-name>/cpus/<cpu-id>/: Directory for the virtual cpus for
one LPAR. <cpu-id> is a logical (decimal) cpu number.
- systems/<lpar-name>/cpus/<cpu-id>/type: Type name of the
logical zSeries cpu.
- systems/<lpar-name>/cpus/<cpu-id>/mgmtime: LPAR-management time.
Accumulated number of microseconds during which a physical
CPU was assigned to the logical cpu and the cpu time was
consumed by the hypervisor and was not provided to
the LPAR (LPAR overhead).
- systems/<lpar-name>/cpus/<cpu-id>/cputime:
Accumulated number of microseconds during which a physical CPU
was assigned to the logical cpu and the cpu time was consumed
by the LPAR.
- systems/<lpar-name>/cpus/<cpu-id>/onlinetime: Accumulated number of
microseconds during which the logical CPU has been online.
The update process is triggered when writing 'something' into the
'update' file at the top level hypfs directory. You can do this e.g.
with 'echo 1 > update'. During the update the whole directory structure
is deleted and built up again. The update file contains the time of the
last update in seconds since 1970.
Acked-by: Martin Schwidefsky <[email protected]>
Signed-off-by: Michael Holzheu <[email protected]>
---
fs/Kconfig | 11
fs/Makefile | 1
fs/hypfs/Makefile | 7
fs/hypfs/hypfs.h | 43 +++
fs/hypfs/hypfs_diag.c | 628 ++++++++++++++++++++++++++++++++++++++++++++++++++
fs/hypfs/hypfs_diag.h | 16 +
fs/hypfs/inode.c | 469 +++++++++++++++++++++++++++++++++++++
7 files changed, 1175 insertions(+)
diff -urpN linux-2.6.16/fs/Kconfig linux-2.6.16-hypfs/fs/Kconfig
--- linux-2.6.16/fs/Kconfig 2006-03-20 06:53:29.000000000 +0100
+++ linux-2.6.16-hypfs/fs/Kconfig 2006-04-21 12:56:58.000000000 +0200
@@ -802,6 +802,17 @@ config PROC_VMCORE
help
Exports the dump image of crashed kernel in ELF format.
+config HYPFS_FS
+ bool "zseries hypervisor file system support"
+ depends on S390
+ default y
+ help
+ This is a virtual file system intended to provide accounting
+ information in a zSeries hypervisor environment.
+
+ If you don't know whether you need it, then you don't need it:
+ answer N.
+
config SYSFS
bool "sysfs file system support" if EMBEDDED
default y
diff -urpN linux-2.6.16/fs/Makefile linux-2.6.16-hypfs/fs/Makefile
--- linux-2.6.16/fs/Makefile 2006-03-20 06:53:29.000000000 +0100
+++ linux-2.6.16-hypfs/fs/Makefile 2006-04-21 12:56:58.000000000 +0200
@@ -54,6 +54,7 @@ obj-$(CONFIG_REISERFS_FS) += reiserfs/
obj-$(CONFIG_EXT3_FS) += ext3/ # Before ext2 so root fs can be ext3
obj-$(CONFIG_JBD) += jbd/
obj-$(CONFIG_EXT2_FS) += ext2/
+obj-$(CONFIG_HYPFS_FS) += hypfs/
obj-$(CONFIG_CRAMFS) += cramfs/
obj-$(CONFIG_RAMFS) += ramfs/
obj-$(CONFIG_HUGETLBFS) += hugetlbfs/
diff -urpN linux-2.6.16/fs/hypfs/Makefile linux-2.6.16-hypfs/fs/hypfs/Makefile
--- linux-2.6.16/fs/hypfs/Makefile 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.16-hypfs/fs/hypfs/Makefile 2006-04-21 12:56:58.000000000 +0200
@@ -0,0 +1,7 @@
+#
+# Makefile for the linux hypfs filesystem routines.
+#
+
+obj-$(CONFIG_HYPFS_FS) += hypfs.o
+
+hypfs-objs := inode.o hypfs_diag.o
diff -urpN linux-2.6.16/fs/hypfs/hypfs.h linux-2.6.16-hypfs/fs/hypfs/hypfs.h
--- linux-2.6.16/fs/hypfs/hypfs.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.16-hypfs/fs/hypfs/hypfs.h 2006-04-21 12:56:58.000000000 +0200
@@ -0,0 +1,43 @@
+/*
+ * fs/hypfs/hypfs.h
+ * Hypervisor filesystem for Linux on zSeries.
+ *
+ * Copyright (C) IBM Corp. 2006
+ * Author(s): Michael Holzheu <[email protected]>
+ */
+
+#ifndef _HYPFS_H_
+#define _HYPFS_H_
+
+#include <linux/fs.h>
+#include <linux/types.h>
+
+#define REG_FILE_MODE 0440
+#define UPDATE_FILE_MODE 0660
+#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);
+
+static void inline remove_trailing_blanks(char *string)
+{
+ char *ptr;
+ for (ptr = string + strlen(string) - 1; ptr > string; ptr--) {
+ if (*ptr == ' ')
+ *ptr = 0;
+ else
+ break;
+ }
+}
+
+extern struct super_block *hypfs_sblk;
+
+#endif /* _HYPFS_H_ */
diff -urpN linux-2.6.16/fs/hypfs/hypfs_diag.c linux-2.6.16-hypfs/fs/hypfs/hypfs_diag.c
--- linux-2.6.16/fs/hypfs/hypfs_diag.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.16-hypfs/fs/hypfs/hypfs_diag.c 2006-04-21 12:56:58.000000000 +0200
@@ -0,0 +1,628 @@
+/*
+ * fs/hypfs/hypfs_diag.c
+ * Hypervisor filesystem for Linux on zSeries. Diag 204 and 224
+ * implementation.
+ *
+ * Copyright (C) IBM Corp. 2006
+ * Author(s): Michael Holzheu <[email protected]>
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <asm/ebcdic.h>
+#include "hypfs.h"
+
+#define LPAR_NAME_LEN 8 /* lpar name len in diag 204 data */
+#define TMP_SIZE 1024 /* size of temorary buffers */
+
+/* diag 204 subcodes */
+typedef enum {
+ SUBC_STIB4 = 4,
+ SUBC_RSI = 5,
+ SUBC_STIB6 = 6,
+ SUBC_STIB7 = 7
+} diag204_subc_t;
+
+/* The two available diag 204 data formats */
+typedef enum {
+ INFO_SIMPLE = 0,
+ INFO_EXT = 0x00010000
+} diag204_info_t;
+
+/* 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 diag204_subc_t diag204_store_sc; /* used subcode for store */
+static diag204_info_t diag204_info_type; /* used diag 204 data format */
+
+/*
+ * DIAG 204 data structures and member access functions.
+ *
+ * Since we have two different diag 204 data formats for old and new zSeries
+ * 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(diag204_info_t 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(diag204_info_t 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(diag204_info_t 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__phys_cpus(diag204_info_t 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(diag204_info_t type)
+{
+ if (type == INFO_SIMPLE)
+ return sizeof(struct part_hdr);
+ else /* INFO_EXT */
+ return sizeof(struct x_part_hdr);
+}
+
+static inline __u8 part_hdr__cpus(diag204_info_t type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct part_hdr *)hdr)->cpus;
+ else /* INFO_EXT */
+ return ((struct x_part_hdr *)hdr)->cpus;
+}
+
+static inline void part_hdr__part_name(diag204_info_t 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;
+ remove_trailing_blanks(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(diag204_info_t 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(diag204_info_t 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(diag204_info_t 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(diag204_info_t 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(diag204_info_t 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(diag204_info_t 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(diag204_info_t 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(diag204_info_t 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(diag204_info_t 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(diag204_info_t 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(diag204_info_t 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(diag204_info_t 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 inline 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;
+}
+
+/*
+ * 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.
+ */
+
+/* XXX What get we back from subcode 5? Length for subcode 6 or subcode 7 ? */
+/* XXX Use GFP_DMA für diag204 ? */
+
+static int diag204_probe(void)
+{
+ void *buf;
+ int pages, rc;
+
+ pages = diag204(SUBC_RSI | INFO_EXT, 0, 0);
+ if (pages > 0) {
+ if (!(buf = kmalloc(pages * PAGE_SIZE, GFP_KERNEL))) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+ 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;
+ }
+ kfree(buf);
+ }
+ if (!(buf = kmalloc(PAGE_SIZE, GFP_KERNEL))) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+ 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 err_out;
+ }
+ out:
+ kfree(buf);
+ return 0;
+ err_out:
+ kfree(buf);
+ return rc;
+}
+
+static void *diag204_store(void)
+{
+ void *buf;
+ int pages;
+
+ if (diag204_store_sc == SUBC_STIB4)
+ pages = 1;
+ else
+ pages = diag204(SUBC_RSI | diag204_info_type, 0, 0);
+
+ if (pages < 0)
+ return ERR_PTR(-ENOSYS);
+
+ if (!(buf = kmalloc(pages * PAGE_SIZE, GFP_KERNEL)))
+ return ERR_PTR(-ENOMEM);
+
+ if (diag204(diag204_store_sc | diag204_info_type, pages, buf) < 0) {
+ kfree(buf);
+ return ERR_PTR(-ENOSYS);
+ }
+ return buf;
+}
+
+/* Diagnose 224 functions */
+
+static inline void diag224(void *ptr)
+{
+ asm volatile(" diag %0,%1,0x224\n"
+ : :"d" (0), "d"(ptr) : "memory");
+}
+
+static inline 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 inline 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) * 16), 16);
+ name[16] = 0;
+ remove_trailing_blanks(name);
+ return 0;
+}
+
+int 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;
+}
+
+void diag_exit(void)
+{
+ diag224_delete_name_table();
+}
+
+/*
+ * 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__cpus(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 diag_create_files(struct super_block *sb, struct dentry *root)
+{
+ struct dentry *systems_dir, *hyp_dir;
+ void *time_hdr, *part_hdr;
+ int i;
+ void *buffer, *rc;
+
+ buffer = diag204_store();
+ if (IS_ERR(buffer))
+ return PTR_ERR(buffer);
+
+ systems_dir = hypfs_mkdir(sb, root, "systems");
+ if (IS_ERR(systems_dir))
+ return PTR_ERR(systems_dir);
+ 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))
+ return PTR_ERR(part_hdr);
+ }
+ if (info_blk_hdr__flags(diag204_info_type, time_hdr) & LPAR_PHYS_FLG) {
+ void *rc;
+ rc = hypfs_create_phys_files(sb, root, part_hdr);
+ if (IS_ERR(rc))
+ return PTR_ERR(rc);
+ }
+ hyp_dir = hypfs_mkdir(sb, root, "hyp");
+ if (IS_ERR(hyp_dir))
+ return PTR_ERR(hyp_dir);
+ rc = hypfs_create_str(sb, hyp_dir, "type", "LPAR Hypervisor");
+ if (IS_ERR(rc))
+ return PTR_ERR(rc);
+ kfree(buffer);
+ return 0;
+}
diff -urpN linux-2.6.16/fs/hypfs/hypfs_diag.h linux-2.6.16-hypfs/fs/hypfs/hypfs_diag.h
--- linux-2.6.16/fs/hypfs/hypfs_diag.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.16-hypfs/fs/hypfs/hypfs_diag.h 2006-04-21 12:56:58.000000000 +0200
@@ -0,0 +1,16 @@
+/*
+ * fs/hypfs/hypfs_diag.h
+ * Hypervisor filesystem for Linux on zSeries.
+ *
+ * Copyright (C) IBM Corp. 2006
+ * Author(s): Michael Holzheu <[email protected]>
+ */
+
+#ifndef _HYPFS_DIAG_H_
+#define _HYPFS_DIAG_H_
+
+extern int diag_init(void);
+extern void diag_exit(void);
+extern int diag_create_files(struct super_block *sb, struct dentry *root);
+
+#endif /* _HYPFS_DIAG_H_ */
diff -urpN linux-2.6.16/fs/hypfs/inode.c linux-2.6.16-hypfs/fs/hypfs/inode.c
--- linux-2.6.16/fs/hypfs/inode.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.16-hypfs/fs/hypfs/inode.c 2006-04-21 12:56:58.000000000 +0200
@@ -0,0 +1,469 @@
+/*
+ * fs/hypfs/inode.c
+ * Hypervisor filesystem for Linux on zSeries.
+ *
+ * Copyright (C) IBM Corp. 2006
+ * Author(s): Michael Holzheu <[email protected]>
+ */
+
+#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 1024 /* size of temorary buffers */
+#define UPDATE_DATA_SIZE 32 /* size of update file inode buffer */
+
+static struct dentry *hypfs_create_update_file(struct super_block *sb,
+ struct dentry *dir);
+
+struct hypfs_sb_info {
+ int uid; /* uid used for files and dirs */
+ int gid; /* gid used for files and dirs */
+};
+
+struct super_block *hypfs_sblk;
+static struct dentry *update_file_dentry;
+static struct file_operations hypfs_file_ops;
+static struct file_system_type hypfs_type;
+static struct super_operations hypfs_s_ops;
+static time_t last_update_time = 0; /* update time in seconds since 1970 */
+static DECLARE_MUTEX(hypfs_lock); // XXX DEFINE_MUTEX in 2.6.16 !
+
+/* start of list of all dentries, which have to be deleted on update */
+static struct dentry *hypfs_last_dentry;
+
+static void hypfs_update_update(void)
+{
+ last_update_time = get_seconds();
+ snprintf((char *)update_file_dentry->d_inode->u.generic_ip,
+ UPDATE_DATA_SIZE, "%ld\n", last_update_time);
+ update_file_dentry->d_inode->i_size =
+ strlen((char *)update_file_dentry->d_inode->u.generic_ip);
+ update_file_dentry->d_inode->i_atime =
+ update_file_dentry->d_inode->i_mtime =
+ update_file_dentry->d_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_delete_tree(struct dentry *root)
+{
+ while (hypfs_last_dentry) {
+ struct dentry *parent, *next_dentry;
+
+ parent = hypfs_last_dentry->d_parent;
+ if (S_ISDIR(hypfs_last_dentry->d_inode->i_mode))
+ simple_rmdir(parent->d_inode, hypfs_last_dentry);
+ else
+ simple_unlink(parent->d_inode, hypfs_last_dentry);
+ d_delete(hypfs_last_dentry);
+ next_dentry = hypfs_last_dentry->d_fsdata;
+ dput(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) {
+ ret->i_mode = mode;
+ ret->i_uid = ((struct hypfs_sb_info *)sb->s_fs_info)->uid;
+ ret->i_gid = ((struct hypfs_sb_info *)sb->s_fs_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((void *)inode->u.generic_ip);
+ generic_delete_inode(inode);
+}
+
+static int hypfs_open(struct inode *inode, struct file *filp)
+{
+ char *data = (char *)filp->f_dentry->d_inode->u.generic_ip;
+
+ if ((filp->f_mode & FMODE_WRITE) &&
+ (filp->f_dentry != update_file_dentry))
+ return -EPERM;
+ down(&hypfs_lock);
+ filp->private_data = kmalloc(strlen(data) + 1, GFP_KERNEL);
+ if (!filp->private_data) {
+ up(&hypfs_lock);
+ return -ENOMEM;
+ }
+ strcpy(filp->private_data, data);
+ up(&hypfs_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 = (char *)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;
+
+ down(&hypfs_lock);
+ if (last_update_time == get_seconds()) {
+ rc = -EBUSY;
+ goto out;
+ }
+ hypfs_delete_tree(hypfs_sblk->s_root);
+ rc = diag_create_files(hypfs_sblk, hypfs_sblk->s_root);
+ if (rc) {
+ printk(KERN_ERR "hypfs: Update failed\n");
+ hypfs_delete_tree(hypfs_sblk->s_root);
+ goto out;
+ }
+ hypfs_update_update();
+ rc = count;
+ out:
+ up(&hypfs_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)
+{
+ char *str;
+ substring_t args[MAX_OPT_ARGS];
+
+ if (!options)
+ return 0;
+ while ((str = strsep(&options, ",")) != NULL) {
+ int token, option;
+ if (!*str)
+ continue;
+ token = match_token(str, hypfs_tokens, args);
+ switch (token) {
+ case opt_uid:
+ if (match_int(&args[0], &option))
+ return -EINVAL;
+ ((struct hypfs_sb_info *)hypfs_sblk->s_fs_info)->uid
+ = option;
+ break;
+ case opt_gid:
+ if (match_int(&args[0], &option))
+ return -EINVAL;
+ ((struct hypfs_sb_info *)hypfs_sblk->s_fs_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;
+ int rc = 0;
+ struct hypfs_sb_info *sbi;
+
+ sbi = kmalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL);
+ if (!sbi)
+ return -ENOMEM;
+ 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)) {
+ 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;
+ sb->s_root = d_alloc_root(root_inode);
+ if (!sb->s_root) {
+ rc = -ENOMEM;
+ goto err_inode;
+ }
+ hypfs_sblk = sb;
+ rc = diag_create_files(hypfs_sblk, hypfs_sblk->s_root);
+ if (rc)
+ goto err_tree;
+ update_file_dentry = hypfs_create_update_file(hypfs_sblk,
+ hypfs_sblk->s_root);
+ if (IS_ERR(update_file_dentry)) {
+ rc = PTR_ERR(update_file_dentry);
+ goto err_tree;
+ }
+ hypfs_update_update();
+ return 0;
+
+ err_tree:
+ hypfs_delete_tree(hypfs_sblk->s_root);
+ dput(hypfs_sblk->s_root);
+ err_inode:
+ hypfs_drop_inode(root_inode);
+ err_alloc:
+ kfree(sbi);
+ return rc;
+}
+static void hypfs_kill_super(struct super_block *sb)
+{
+ kfree(sb->s_fs_info);
+ kill_litter_super(sb);
+}
+
+static struct super_block *hypfs_get_super(struct file_system_type *fst,
+ int flags, const char *devname,
+ void *data)
+{
+ return get_sb_single(fst, flags, data, hypfs_fill_super);
+}
+
+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;
+ inode->i_size = strlen(data);
+ } 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);
+ 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)
+{
+ char *buffer;
+ struct dentry *dentry;
+
+ buffer = kmalloc(UPDATE_DATA_SIZE, GFP_KERNEL);
+ if (!buffer)
+ return ERR_PTR(-ENOMEM);
+ snprintf(buffer, UPDATE_DATA_SIZE, "%d\n", 0);
+ dentry = hypfs_create_file(sb, dir, "update", buffer,
+ S_IFREG | UPDATE_FILE_MODE);
+ if (!dentry) {
+ kfree(buffer);
+ return ERR_PTR(-ENOMEM);
+ }
+ /*
+ * 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 = kmalloc(strlen(tmp) + 1, GFP_KERNEL);
+ if (!buffer)
+ return ERR_PTR(-ENOMEM);
+ strcpy(buffer, tmp);
+ dentry =
+ hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE);
+ if (!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 (!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 = "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,
+};
+
+/*
+ * init and exit
+ * *************
+ */
+
+static decl_subsys(hypervisor, NULL, NULL);
+
+static int __init hypfs_init(void)
+{
+ int rc;
+
+ if (MACHINE_IS_VM) {
+ return -ENODATA;
+ }
+ if (diag_init()) {
+ printk(KERN_ERR "hypfs: diag init failed.\n");
+ return -ENODATA;
+ }
+ rc = subsystem_register(&hypervisor_subsys);
+ if (rc) {
+ diag_exit();
+ return rc;
+ }
+ rc = register_filesystem(&hypfs_type);
+ if (rc) {
+ subsystem_unregister(&hypervisor_subsys);
+ diag_exit();
+ return rc;
+ }
+ return 0;
+}
+
+static void __exit hypfs_exit(void)
+{
+ diag_exit();
+ unregister_filesystem(&hypfs_type);
+ subsystem_unregister(&hypervisor_subsys);
+}
+
+module_init(hypfs_init)
+module_exit(hypfs_exit)
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Michael Holzheu <[email protected]>");
+MODULE_DESCRIPTION("zSeries Hypervisor Filesystem");
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