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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2010-05-17 12:00:20 +0400
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-05-17 12:00:17 +0400
commit57b28f66316d287b9dbf7b28358ca90257230769 (patch)
tree9486fff9e7c746721dbcbbbeb34ddd1307460e89 /arch/s390/hypfs/hypfs_diag.c
parentcc961d400e06e78c7aa39aeab1f001eb8f76ef90 (diff)
downloadlinux-57b28f66316d287b9dbf7b28358ca90257230769.tar.xz
[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/hypfs_diag.c')
-rw-r--r--arch/s390/hypfs/hypfs_diag.c123
1 files changed, 116 insertions, 7 deletions
diff --git a/arch/s390/hypfs/hypfs_diag.c b/arch/s390/hypfs/hypfs_diag.c
index 5b1acdba6495..1211bb1d2f24 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();
}