From 57b28f66316d287b9dbf7b28358ca90257230769 Mon Sep 17 00:00:00 2001 From: Michael Holzheu Date: Mon, 17 May 2010 10:00:20 +0200 Subject: [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 Signed-off-by: Martin Schwidefsky --- arch/s390/hypfs/hypfs_vm.c | 87 ++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 80 insertions(+), 7 deletions(-) (limited to 'arch/s390/hypfs/hypfs_vm.c') diff --git a/arch/s390/hypfs/hypfs_vm.c b/arch/s390/hypfs/hypfs_vm.c index f0b0d31f0b48..ee5ab1a578e7 100644 --- a/arch/s390/hypfs/hypfs_vm.c +++ b/arch/s390/hypfs/hypfs_vm.c @@ -10,14 +10,18 @@ #include #include #include +#include #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); +} -- cgit v1.2.3-59-g8ed1b