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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2010-05-17 10:00:20 +0200
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-05-17 10:00:17 +0200
commit57b28f66316d287b9dbf7b28358ca90257230769 (patch)
tree9486fff9e7c746721dbcbbbeb34ddd1307460e89 /arch/s390/hypfs
parentcc961d400e06e78c7aa39aeab1f001eb8f76ef90 (diff)
downloadlinux-linaro-android-57b28f66316d287b9dbf7b28358ca90257230769.tar.gz
[S390] s390_hypfs: Add new attributes
In order to access the data of the hypfs diagnose calls from user space also in binary form, this patch adds two new attributes in debugfs: * z/VM: s390_hypfs/d2fc_bin * LPAR: s390_hypfs/d204_bin Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/hypfs')
-rw-r--r--arch/s390/hypfs/hypfs.h4
-rw-r--r--arch/s390/hypfs/hypfs_diag.c123
-rw-r--r--arch/s390/hypfs/hypfs_vm.c87
-rw-r--r--arch/s390/hypfs/inode.c40
4 files changed, 224 insertions, 30 deletions
diff --git a/arch/s390/hypfs/hypfs.h b/arch/s390/hypfs/hypfs.h
index aea572009d6..fa487d4cc08 100644
--- a/arch/s390/hypfs/hypfs.h
+++ b/arch/s390/hypfs/hypfs.h
@@ -11,6 +11,7 @@
#include <linux/fs.h>
#include <linux/types.h>
+#include <linux/debugfs.h>
#define REG_FILE_MODE 0440
#define UPDATE_FILE_MODE 0220
@@ -34,6 +35,9 @@ extern int hypfs_diag_create_files(struct super_block *sb, struct dentry *root);
/* VM Hypervisor */
extern int hypfs_vm_init(void);
+extern void hypfs_vm_exit(void);
extern int hypfs_vm_create_files(struct super_block *sb, struct dentry *root);
+/* Directory for debugfs files */
+extern struct dentry *hypfs_dbfs_dir;
#endif /* _HYPFS_H_ */
diff --git a/arch/s390/hypfs/hypfs_diag.c b/arch/s390/hypfs/hypfs_diag.c
index 5b1acdba649..1211bb1d2f2 100644
--- a/arch/s390/hypfs/hypfs_diag.c
+++ b/arch/s390/hypfs/hypfs_diag.c
@@ -15,6 +15,7 @@
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/vmalloc.h>
+#include <linux/mm.h>
#include <asm/ebcdic.h>
#include "hypfs.h"
@@ -22,6 +23,8 @@
#define CPU_NAME_LEN 16 /* type name len of cpus in diag224 name table */
#define TMP_SIZE 64 /* size of temporary buffers */
+#define DBFS_D204_HDR_VERSION 0
+
/* diag 204 subcodes */
enum diag204_sc {
SUBC_STIB4 = 4,
@@ -47,6 +50,8 @@ 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 */
+static struct dentry *dbfs_d204_file;
+
/*
* DIAG 204 data structures and member access functions.
*
@@ -364,18 +369,21 @@ static void diag204_free_buffer(void)
} else {
free_pages((unsigned long) diag204_buf, 0);
}
- diag204_buf_pages = 0;
diag204_buf = NULL;
}
+static void *page_align_ptr(void *ptr)
+{
+ return (void *) PAGE_ALIGN((unsigned long) ptr);
+}
+
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 = page_align_ptr(diag204_buf_vmalloc);
diag204_buf_pages = pages;
return diag204_buf;
}
@@ -468,17 +476,26 @@ fail_alloc:
return rc;
}
+static int diag204_do_store(void *buf, int pages)
+{
+ int rc;
+
+ rc = diag204((unsigned long) diag204_store_sc |
+ (unsigned long) diag204_info_type, pages, buf);
+ return rc < 0 ? -ENOSYS : 0;
+}
+
static void *diag204_store(void)
{
void *buf;
- int pages;
+ int pages, rc;
buf = diag204_get_buffer(diag204_info_type, &pages);
if (IS_ERR(buf))
goto out;
- if (diag204((unsigned long)diag204_store_sc |
- (unsigned long)diag204_info_type, pages, buf) < 0)
- return ERR_PTR(-ENOSYS);
+ rc = diag204_do_store(buf, pages);
+ if (rc)
+ return ERR_PTR(rc);
out:
return buf;
}
@@ -526,6 +543,92 @@ static int diag224_idx2name(int index, char *name)
return 0;
}
+struct dbfs_d204_hdr {
+ u64 len; /* Length of d204 buffer without header */
+ u16 version; /* Version of header */
+ u8 sc; /* Used subcode */
+ char reserved[53];
+} __attribute__ ((packed));
+
+struct dbfs_d204 {
+ struct dbfs_d204_hdr hdr; /* 64 byte header */
+ char buf[]; /* d204 buffer */
+} __attribute__ ((packed));
+
+struct dbfs_d204_private {
+ struct dbfs_d204 *d204; /* Aligned d204 data with header */
+ void *base; /* Base pointer (needed for vfree) */
+};
+
+static int dbfs_d204_open(struct inode *inode, struct file *file)
+{
+ struct dbfs_d204_private *data;
+ struct dbfs_d204 *d204;
+ int rc, buf_size;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+ buf_size = PAGE_SIZE * (diag204_buf_pages + 1) + sizeof(d204->hdr);
+ data->base = vmalloc(buf_size);
+ if (!data->base) {
+ rc = -ENOMEM;
+ goto fail_kfree_data;
+ }
+ memset(data->base, 0, buf_size);
+ d204 = page_align_ptr(data->base + sizeof(d204->hdr))
+ - sizeof(d204->hdr);
+ rc = diag204_do_store(&d204->buf, diag204_buf_pages);
+ if (rc)
+ goto fail_vfree_base;
+ d204->hdr.version = DBFS_D204_HDR_VERSION;
+ d204->hdr.len = PAGE_SIZE * diag204_buf_pages;
+ d204->hdr.sc = diag204_store_sc;
+ data->d204 = d204;
+ file->private_data = data;
+ return nonseekable_open(inode, file);
+
+fail_vfree_base:
+ vfree(data->base);
+fail_kfree_data:
+ kfree(data);
+ return rc;
+}
+
+static int dbfs_d204_release(struct inode *inode, struct file *file)
+{
+ struct dbfs_d204_private *data = file->private_data;
+
+ vfree(data->base);
+ kfree(data);
+ return 0;
+}
+
+static ssize_t dbfs_d204_read(struct file *file, char __user *buf,
+ size_t size, loff_t *ppos)
+{
+ struct dbfs_d204_private *data = file->private_data;
+
+ return simple_read_from_buffer(buf, size, ppos, data->d204,
+ data->d204->hdr.len +
+ sizeof(data->d204->hdr));
+}
+
+static const struct file_operations dbfs_d204_ops = {
+ .open = dbfs_d204_open,
+ .read = dbfs_d204_read,
+ .release = dbfs_d204_release,
+};
+
+static int hypfs_dbfs_init(void)
+{
+ dbfs_d204_file = debugfs_create_file("diag_204", 0400, hypfs_dbfs_dir,
+ NULL, &dbfs_d204_ops);
+ if (IS_ERR(dbfs_d204_file))
+ return PTR_ERR(dbfs_d204_file);
+ return 0;
+}
+
__init int hypfs_diag_init(void)
{
int rc;
@@ -540,11 +643,17 @@ __init int hypfs_diag_init(void)
pr_err("The hardware system does not provide all "
"functions required by hypfs\n");
}
+ if (diag204_info_type == INFO_EXT) {
+ rc = hypfs_dbfs_init();
+ if (rc)
+ diag204_free_buffer();
+ }
return rc;
}
void hypfs_diag_exit(void)
{
+ debugfs_remove(dbfs_d204_file);
diag224_delete_name_table();
diag204_free_buffer();
}
diff --git a/arch/s390/hypfs/hypfs_vm.c b/arch/s390/hypfs/hypfs_vm.c
index f0b0d31f0b4..ee5ab1a578e 100644
--- a/arch/s390/hypfs/hypfs_vm.c
+++ b/arch/s390/hypfs/hypfs_vm.c
@@ -10,14 +10,18 @@
#include <linux/string.h>
#include <linux/vmalloc.h>
#include <asm/ebcdic.h>
+#include <asm/timex.h>
#include "hypfs.h"
#define NAME_LEN 8
+#define DBFS_D2FC_HDR_VERSION 0
static char local_guest[] = " ";
static char all_guests[] = "* ";
static char *guest_query;
+static struct dentry *dbfs_d2fc_file;
+
struct diag2fc_data {
__u32 version;
__u32 flags;
@@ -76,23 +80,26 @@ static int diag2fc(int size, char* query, void *addr)
return -residual_cnt;
}
-static struct diag2fc_data *diag2fc_store(char *query, int *count)
+/*
+ * Allocate buffer for "query" and store diag 2fc at "offset"
+ */
+static void *diag2fc_store(char *query, unsigned int *count, int offset)
{
+ void *data;
int size;
- struct diag2fc_data *data;
do {
size = diag2fc(0, query, NULL);
if (size < 0)
return ERR_PTR(-EACCES);
- data = vmalloc(size);
+ data = vmalloc(size + offset);
if (!data)
return ERR_PTR(-ENOMEM);
- if (diag2fc(size, query, data) == 0)
+ if (diag2fc(size, query, data + offset) == 0)
break;
vfree(data);
} while (1);
- *count = (size / sizeof(*data));
+ *count = (size / sizeof(struct diag2fc_data));
return data;
}
@@ -168,9 +175,10 @@ int hypfs_vm_create_files(struct super_block *sb, struct dentry *root)
{
struct dentry *dir, *file;
struct diag2fc_data *data;
- int rc, i, count = 0;
+ unsigned int count = 0;
+ int rc, i;
- data = diag2fc_store(guest_query, &count);
+ data = diag2fc_store(guest_query, &count, 0);
if (IS_ERR(data))
return PTR_ERR(data);
@@ -218,8 +226,61 @@ failed:
return rc;
}
+struct dbfs_d2fc_hdr {
+ u64 len; /* Length of d2fc buffer without header */
+ u16 version; /* Version of header */
+ char tod_ext[16]; /* TOD clock for d2fc */
+ u64 count; /* Number of VM guests in d2fc buffer */
+ char reserved[30];
+} __attribute__ ((packed));
+
+struct dbfs_d2fc {
+ struct dbfs_d2fc_hdr hdr; /* 64 byte header */
+ char buf[]; /* d2fc buffer */
+} __attribute__ ((packed));
+
+static int dbfs_d2fc_open(struct inode *inode, struct file *file)
+{
+ struct dbfs_d2fc *data;
+ unsigned int count;
+
+ data = diag2fc_store(guest_query, &count, sizeof(data->hdr));
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+ get_clock_ext(data->hdr.tod_ext);
+ data->hdr.len = count * sizeof(struct diag2fc_data);
+ data->hdr.version = DBFS_D2FC_HDR_VERSION;
+ data->hdr.count = count;
+ memset(&data->hdr.reserved, 0, sizeof(data->hdr.reserved));
+ file->private_data = data;
+ return nonseekable_open(inode, file);
+}
+
+static int dbfs_d2fc_release(struct inode *inode, struct file *file)
+{
+ diag2fc_free(file->private_data);
+ return 0;
+}
+
+static ssize_t dbfs_d2fc_read(struct file *file, char __user *buf,
+ size_t size, loff_t *ppos)
+{
+ struct dbfs_d2fc *data = file->private_data;
+
+ return simple_read_from_buffer(buf, size, ppos, data, data->hdr.len +
+ sizeof(struct dbfs_d2fc_hdr));
+}
+
+static const struct file_operations dbfs_d2fc_ops = {
+ .open = dbfs_d2fc_open,
+ .read = dbfs_d2fc_read,
+ .release = dbfs_d2fc_release,
+};
+
int hypfs_vm_init(void)
{
+ if (!MACHINE_IS_VM)
+ return 0;
if (diag2fc(0, all_guests, NULL) > 0)
guest_query = all_guests;
else if (diag2fc(0, local_guest, NULL) > 0)
@@ -227,5 +288,17 @@ int hypfs_vm_init(void)
else
return -EACCES;
+ dbfs_d2fc_file = debugfs_create_file("diag_2fc", 0400, hypfs_dbfs_dir,
+ NULL, &dbfs_d2fc_ops);
+ if (IS_ERR(dbfs_d2fc_file))
+ return PTR_ERR(dbfs_d2fc_file);
+
return 0;
}
+
+void hypfs_vm_exit(void)
+{
+ if (!MACHINE_IS_VM)
+ return;
+ debugfs_remove(dbfs_d2fc_file);
+}
diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c
index 95c1aaac06c..6b120f07304 100644
--- a/arch/s390/hypfs/inode.c
+++ b/arch/s390/hypfs/inode.c
@@ -46,6 +46,8 @@ static const 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;
+struct dentry *hypfs_dbfs_dir;
+
static void hypfs_update_update(struct super_block *sb)
{
struct hypfs_sb_info *sb_info = sb->s_fs_info;
@@ -468,20 +470,22 @@ static int __init hypfs_init(void)
{
int rc;
- if (MACHINE_IS_VM) {
- if (hypfs_vm_init())
- /* no diag 2fc, just exit */
- return -ENODATA;
- } else {
- if (hypfs_diag_init()) {
- rc = -ENODATA;
- goto fail_diag;
- }
+ hypfs_dbfs_dir = debugfs_create_dir("s390_hypfs", NULL);
+ if (IS_ERR(hypfs_dbfs_dir))
+ return PTR_ERR(hypfs_dbfs_dir);
+
+ if (hypfs_diag_init()) {
+ rc = -ENODATA;
+ goto fail_debugfs_remove;
+ }
+ if (hypfs_vm_init()) {
+ rc = -ENODATA;
+ goto fail_hypfs_diag_exit;
}
s390_kobj = kobject_create_and_add("s390", hypervisor_kobj);
if (!s390_kobj) {
rc = -ENOMEM;
- goto fail_sysfs;
+ goto fail_hypfs_vm_exit;
}
rc = register_filesystem(&hypfs_type);
if (rc)
@@ -490,18 +494,22 @@ static int __init hypfs_init(void)
fail_filesystem:
kobject_put(s390_kobj);
-fail_sysfs:
- if (!MACHINE_IS_VM)
- hypfs_diag_exit();
-fail_diag:
+fail_hypfs_vm_exit:
+ hypfs_vm_exit();
+fail_hypfs_diag_exit:
+ hypfs_diag_exit();
+fail_debugfs_remove:
+ debugfs_remove(hypfs_dbfs_dir);
+
pr_err("Initialization of hypfs failed with rc=%i\n", rc);
return rc;
}
static void __exit hypfs_exit(void)
{
- if (!MACHINE_IS_VM)
- hypfs_diag_exit();
+ hypfs_diag_exit();
+ hypfs_vm_exit();
+ debugfs_remove(hypfs_dbfs_dir);
unregister_filesystem(&hypfs_type);
kobject_put(s390_kobj);
}