[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>
This commit is contained in:
Michael Holzheu
Martin Schwidefsky
parent
cc961d400e
commit
57b28f6631
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@ -11,6 +11,7 @@
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/debugfs.h>
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#define REG_FILE_MODE 0440
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#define UPDATE_FILE_MODE 0220
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@ -34,6 +35,9 @@ extern int hypfs_diag_create_files(struct super_block *sb, struct dentry *root);
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/* VM Hypervisor */
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extern int hypfs_vm_init(void);
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extern void hypfs_vm_exit(void);
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extern int hypfs_vm_create_files(struct super_block *sb, struct dentry *root);
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/* Directory for debugfs files */
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extern struct dentry *hypfs_dbfs_dir;
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#endif /* _HYPFS_H_ */
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@ -15,6 +15,7 @@
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include <asm/ebcdic.h>
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#include "hypfs.h"
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@ -22,6 +23,8 @@
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#define CPU_NAME_LEN 16 /* type name len of cpus in diag224 name table */
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#define TMP_SIZE 64 /* size of temporary buffers */
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#define DBFS_D204_HDR_VERSION 0
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/* diag 204 subcodes */
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enum diag204_sc {
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SUBC_STIB4 = 4,
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@ -47,6 +50,8 @@ static void *diag204_buf; /* 4K aligned buffer for diag204 data */
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static void *diag204_buf_vmalloc; /* vmalloc pointer for diag204 data */
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static int diag204_buf_pages; /* number of pages for diag204 data */
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static struct dentry *dbfs_d204_file;
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/*
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* DIAG 204 data structures and member access functions.
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*
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@ -364,18 +369,21 @@ static void diag204_free_buffer(void)
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} else {
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free_pages((unsigned long) diag204_buf, 0);
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}
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diag204_buf_pages = 0;
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diag204_buf = NULL;
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}
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static void *page_align_ptr(void *ptr)
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{
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return (void *) PAGE_ALIGN((unsigned long) ptr);
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}
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static void *diag204_alloc_vbuf(int pages)
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{
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/* The buffer has to be page aligned! */
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diag204_buf_vmalloc = vmalloc(PAGE_SIZE * (pages + 1));
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if (!diag204_buf_vmalloc)
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return ERR_PTR(-ENOMEM);
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diag204_buf = (void*)((unsigned long)diag204_buf_vmalloc
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& ~0xfffUL) + 0x1000;
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diag204_buf = page_align_ptr(diag204_buf_vmalloc);
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diag204_buf_pages = pages;
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return diag204_buf;
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}
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@ -468,17 +476,26 @@ fail_alloc:
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return rc;
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}
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static int diag204_do_store(void *buf, int pages)
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{
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int rc;
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rc = diag204((unsigned long) diag204_store_sc |
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(unsigned long) diag204_info_type, pages, buf);
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return rc < 0 ? -ENOSYS : 0;
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}
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static void *diag204_store(void)
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{
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void *buf;
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int pages;
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int pages, rc;
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buf = diag204_get_buffer(diag204_info_type, &pages);
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if (IS_ERR(buf))
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goto out;
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if (diag204((unsigned long)diag204_store_sc |
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(unsigned long)diag204_info_type, pages, buf) < 0)
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return ERR_PTR(-ENOSYS);
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rc = diag204_do_store(buf, pages);
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if (rc)
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return ERR_PTR(rc);
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out:
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return buf;
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}
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@ -526,6 +543,92 @@ static int diag224_idx2name(int index, char *name)
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return 0;
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}
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struct dbfs_d204_hdr {
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u64 len; /* Length of d204 buffer without header */
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u16 version; /* Version of header */
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u8 sc; /* Used subcode */
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char reserved[53];
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} __attribute__ ((packed));
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struct dbfs_d204 {
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struct dbfs_d204_hdr hdr; /* 64 byte header */
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char buf[]; /* d204 buffer */
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} __attribute__ ((packed));
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struct dbfs_d204_private {
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struct dbfs_d204 *d204; /* Aligned d204 data with header */
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void *base; /* Base pointer (needed for vfree) */
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};
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static int dbfs_d204_open(struct inode *inode, struct file *file)
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{
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struct dbfs_d204_private *data;
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struct dbfs_d204 *d204;
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int rc, buf_size;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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buf_size = PAGE_SIZE * (diag204_buf_pages + 1) + sizeof(d204->hdr);
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data->base = vmalloc(buf_size);
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if (!data->base) {
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rc = -ENOMEM;
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goto fail_kfree_data;
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}
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memset(data->base, 0, buf_size);
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d204 = page_align_ptr(data->base + sizeof(d204->hdr))
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- sizeof(d204->hdr);
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rc = diag204_do_store(&d204->buf, diag204_buf_pages);
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if (rc)
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goto fail_vfree_base;
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d204->hdr.version = DBFS_D204_HDR_VERSION;
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d204->hdr.len = PAGE_SIZE * diag204_buf_pages;
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d204->hdr.sc = diag204_store_sc;
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data->d204 = d204;
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file->private_data = data;
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return nonseekable_open(inode, file);
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fail_vfree_base:
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vfree(data->base);
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fail_kfree_data:
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kfree(data);
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return rc;
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}
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static int dbfs_d204_release(struct inode *inode, struct file *file)
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{
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struct dbfs_d204_private *data = file->private_data;
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vfree(data->base);
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kfree(data);
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return 0;
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}
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static ssize_t dbfs_d204_read(struct file *file, char __user *buf,
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size_t size, loff_t *ppos)
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{
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struct dbfs_d204_private *data = file->private_data;
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return simple_read_from_buffer(buf, size, ppos, data->d204,
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data->d204->hdr.len +
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sizeof(data->d204->hdr));
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}
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static const struct file_operations dbfs_d204_ops = {
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.open = dbfs_d204_open,
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.read = dbfs_d204_read,
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.release = dbfs_d204_release,
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};
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static int hypfs_dbfs_init(void)
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{
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dbfs_d204_file = debugfs_create_file("diag_204", 0400, hypfs_dbfs_dir,
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NULL, &dbfs_d204_ops);
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if (IS_ERR(dbfs_d204_file))
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return PTR_ERR(dbfs_d204_file);
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return 0;
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}
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__init int hypfs_diag_init(void)
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{
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int rc;
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@ -540,11 +643,17 @@ __init int hypfs_diag_init(void)
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pr_err("The hardware system does not provide all "
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"functions required by hypfs\n");
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}
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if (diag204_info_type == INFO_EXT) {
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rc = hypfs_dbfs_init();
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if (rc)
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diag204_free_buffer();
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}
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return rc;
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}
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void hypfs_diag_exit(void)
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{
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debugfs_remove(dbfs_d204_file);
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diag224_delete_name_table();
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diag204_free_buffer();
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}
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@ -10,14 +10,18 @@
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#include <linux/string.h>
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#include <linux/vmalloc.h>
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#include <asm/ebcdic.h>
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#include <asm/timex.h>
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#include "hypfs.h"
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#define NAME_LEN 8
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#define DBFS_D2FC_HDR_VERSION 0
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static char local_guest[] = " ";
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static char all_guests[] = "* ";
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static char *guest_query;
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static struct dentry *dbfs_d2fc_file;
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struct diag2fc_data {
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__u32 version;
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__u32 flags;
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@ -76,23 +80,26 @@ static int diag2fc(int size, char* query, void *addr)
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return -residual_cnt;
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}
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static struct diag2fc_data *diag2fc_store(char *query, int *count)
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/*
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* Allocate buffer for "query" and store diag 2fc at "offset"
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*/
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static void *diag2fc_store(char *query, unsigned int *count, int offset)
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{
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void *data;
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int size;
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struct diag2fc_data *data;
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do {
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size = diag2fc(0, query, NULL);
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if (size < 0)
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return ERR_PTR(-EACCES);
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data = vmalloc(size);
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data = vmalloc(size + offset);
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if (!data)
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return ERR_PTR(-ENOMEM);
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if (diag2fc(size, query, data) == 0)
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if (diag2fc(size, query, data + offset) == 0)
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break;
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vfree(data);
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} while (1);
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*count = (size / sizeof(*data));
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*count = (size / sizeof(struct diag2fc_data));
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return data;
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}
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@ -168,9 +175,10 @@ int hypfs_vm_create_files(struct super_block *sb, struct dentry *root)
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{
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struct dentry *dir, *file;
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struct diag2fc_data *data;
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int rc, i, count = 0;
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unsigned int count = 0;
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int rc, i;
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data = diag2fc_store(guest_query, &count);
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data = diag2fc_store(guest_query, &count, 0);
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if (IS_ERR(data))
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return PTR_ERR(data);
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@ -218,8 +226,61 @@ failed:
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return rc;
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}
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struct dbfs_d2fc_hdr {
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u64 len; /* Length of d2fc buffer without header */
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u16 version; /* Version of header */
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char tod_ext[16]; /* TOD clock for d2fc */
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u64 count; /* Number of VM guests in d2fc buffer */
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char reserved[30];
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} __attribute__ ((packed));
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struct dbfs_d2fc {
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struct dbfs_d2fc_hdr hdr; /* 64 byte header */
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char buf[]; /* d2fc buffer */
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} __attribute__ ((packed));
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static int dbfs_d2fc_open(struct inode *inode, struct file *file)
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{
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struct dbfs_d2fc *data;
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unsigned int count;
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data = diag2fc_store(guest_query, &count, sizeof(data->hdr));
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if (IS_ERR(data))
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return PTR_ERR(data);
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get_clock_ext(data->hdr.tod_ext);
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data->hdr.len = count * sizeof(struct diag2fc_data);
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data->hdr.version = DBFS_D2FC_HDR_VERSION;
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data->hdr.count = count;
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memset(&data->hdr.reserved, 0, sizeof(data->hdr.reserved));
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file->private_data = data;
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return nonseekable_open(inode, file);
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}
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static int dbfs_d2fc_release(struct inode *inode, struct file *file)
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{
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diag2fc_free(file->private_data);
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return 0;
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}
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static ssize_t dbfs_d2fc_read(struct file *file, char __user *buf,
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size_t size, loff_t *ppos)
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{
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struct dbfs_d2fc *data = file->private_data;
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return simple_read_from_buffer(buf, size, ppos, data, data->hdr.len +
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sizeof(struct dbfs_d2fc_hdr));
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}
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static const struct file_operations dbfs_d2fc_ops = {
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.open = dbfs_d2fc_open,
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.read = dbfs_d2fc_read,
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.release = dbfs_d2fc_release,
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};
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int hypfs_vm_init(void)
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{
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if (!MACHINE_IS_VM)
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return 0;
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if (diag2fc(0, all_guests, NULL) > 0)
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guest_query = all_guests;
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else if (diag2fc(0, local_guest, NULL) > 0)
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@ -227,5 +288,17 @@ int hypfs_vm_init(void)
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else
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return -EACCES;
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dbfs_d2fc_file = debugfs_create_file("diag_2fc", 0400, hypfs_dbfs_dir,
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NULL, &dbfs_d2fc_ops);
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if (IS_ERR(dbfs_d2fc_file))
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return PTR_ERR(dbfs_d2fc_file);
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return 0;
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}
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void hypfs_vm_exit(void)
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{
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if (!MACHINE_IS_VM)
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return;
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debugfs_remove(dbfs_d2fc_file);
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}
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@ -46,6 +46,8 @@ static const struct super_operations hypfs_s_ops;
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/* start of list of all dentries, which have to be deleted on update */
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static struct dentry *hypfs_last_dentry;
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struct dentry *hypfs_dbfs_dir;
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static void hypfs_update_update(struct super_block *sb)
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{
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struct hypfs_sb_info *sb_info = sb->s_fs_info;
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@ -468,20 +470,22 @@ static int __init hypfs_init(void)
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{
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int rc;
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if (MACHINE_IS_VM) {
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if (hypfs_vm_init())
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/* no diag 2fc, just exit */
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return -ENODATA;
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} else {
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if (hypfs_diag_init()) {
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rc = -ENODATA;
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goto fail_diag;
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}
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hypfs_dbfs_dir = debugfs_create_dir("s390_hypfs", NULL);
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if (IS_ERR(hypfs_dbfs_dir))
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return PTR_ERR(hypfs_dbfs_dir);
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if (hypfs_diag_init()) {
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rc = -ENODATA;
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goto fail_debugfs_remove;
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}
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if (hypfs_vm_init()) {
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rc = -ENODATA;
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goto fail_hypfs_diag_exit;
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}
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s390_kobj = kobject_create_and_add("s390", hypervisor_kobj);
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if (!s390_kobj) {
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rc = -ENOMEM;
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goto fail_sysfs;
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goto fail_hypfs_vm_exit;
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}
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rc = register_filesystem(&hypfs_type);
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if (rc)
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@ -490,18 +494,22 @@ static int __init hypfs_init(void)
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fail_filesystem:
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kobject_put(s390_kobj);
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fail_sysfs:
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if (!MACHINE_IS_VM)
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hypfs_diag_exit();
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fail_diag:
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fail_hypfs_vm_exit:
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hypfs_vm_exit();
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fail_hypfs_diag_exit:
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hypfs_diag_exit();
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fail_debugfs_remove:
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debugfs_remove(hypfs_dbfs_dir);
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pr_err("Initialization of hypfs failed with rc=%i\n", rc);
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return rc;
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}
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static void __exit hypfs_exit(void)
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{
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if (!MACHINE_IS_VM)
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hypfs_diag_exit();
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hypfs_diag_exit();
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hypfs_vm_exit();
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debugfs_remove(hypfs_dbfs_dir);
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unregister_filesystem(&hypfs_type);
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kobject_put(s390_kobj);
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}
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@ -61,11 +61,15 @@ static inline unsigned long long get_clock (void)
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return clk;
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}
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static inline void get_clock_ext(char *clk)
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{
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asm volatile("stcke %0" : "=Q" (*clk) : : "cc");
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}
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static inline unsigned long long get_clock_xt(void)
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{
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unsigned char clk[16];
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asm volatile("stcke %0" : "=Q" (clk) : : "cc");
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get_clock_ext(clk);
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return *((unsigned long long *)&clk[1]);
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}
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