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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
When calling debugfs functions, there is no need to ever check the return value. The function can work or not, but the code logic should never do something different based on this. Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: linux-s390@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
616 lines
16 KiB
C
616 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Hypervisor filesystem for Linux on s390. Diag 204 and 224
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* implementation.
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*
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* Copyright IBM Corp. 2006, 2008
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* Author(s): Michael Holzheu <holzheu@de.ibm.com>
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*/
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#define KMSG_COMPONENT "hypfs"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/types.h>
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#include <linux/errno.h>
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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/diag.h>
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#include <asm/ebcdic.h>
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#include "hypfs.h"
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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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static char *diag224_cpu_names; /* diag 224 name table */
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static enum diag204_sc diag204_store_sc; /* used subcode for store */
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static enum diag204_format diag204_info_type; /* used diag 204 data format */
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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 member access functions.
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*
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* Since we have two different diag 204 data formats for old and new s390
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* machines, we do not access the structs directly, but use getter functions for
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* each struct member instead. This should make the code more readable.
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*/
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/* Time information block */
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static inline int info_blk_hdr__size(enum diag204_format type)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return sizeof(struct diag204_info_blk_hdr);
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else /* DIAG204_INFO_EXT */
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return sizeof(struct diag204_x_info_blk_hdr);
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}
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static inline __u8 info_blk_hdr__npar(enum diag204_format type, void *hdr)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return ((struct diag204_info_blk_hdr *)hdr)->npar;
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else /* DIAG204_INFO_EXT */
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return ((struct diag204_x_info_blk_hdr *)hdr)->npar;
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}
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static inline __u8 info_blk_hdr__flags(enum diag204_format type, void *hdr)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return ((struct diag204_info_blk_hdr *)hdr)->flags;
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else /* DIAG204_INFO_EXT */
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return ((struct diag204_x_info_blk_hdr *)hdr)->flags;
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}
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static inline __u16 info_blk_hdr__pcpus(enum diag204_format type, void *hdr)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return ((struct diag204_info_blk_hdr *)hdr)->phys_cpus;
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else /* DIAG204_INFO_EXT */
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return ((struct diag204_x_info_blk_hdr *)hdr)->phys_cpus;
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}
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/* Partition header */
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static inline int part_hdr__size(enum diag204_format type)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return sizeof(struct diag204_part_hdr);
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else /* DIAG204_INFO_EXT */
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return sizeof(struct diag204_x_part_hdr);
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}
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static inline __u8 part_hdr__rcpus(enum diag204_format type, void *hdr)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return ((struct diag204_part_hdr *)hdr)->cpus;
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else /* DIAG204_INFO_EXT */
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return ((struct diag204_x_part_hdr *)hdr)->rcpus;
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}
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static inline void part_hdr__part_name(enum diag204_format type, void *hdr,
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char *name)
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{
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if (type == DIAG204_INFO_SIMPLE)
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memcpy(name, ((struct diag204_part_hdr *)hdr)->part_name,
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DIAG204_LPAR_NAME_LEN);
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else /* DIAG204_INFO_EXT */
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memcpy(name, ((struct diag204_x_part_hdr *)hdr)->part_name,
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DIAG204_LPAR_NAME_LEN);
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EBCASC(name, DIAG204_LPAR_NAME_LEN);
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name[DIAG204_LPAR_NAME_LEN] = 0;
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strim(name);
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}
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/* CPU info block */
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static inline int cpu_info__size(enum diag204_format type)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return sizeof(struct diag204_cpu_info);
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else /* DIAG204_INFO_EXT */
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return sizeof(struct diag204_x_cpu_info);
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}
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static inline __u8 cpu_info__ctidx(enum diag204_format type, void *hdr)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return ((struct diag204_cpu_info *)hdr)->ctidx;
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else /* DIAG204_INFO_EXT */
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return ((struct diag204_x_cpu_info *)hdr)->ctidx;
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}
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static inline __u16 cpu_info__cpu_addr(enum diag204_format type, void *hdr)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return ((struct diag204_cpu_info *)hdr)->cpu_addr;
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else /* DIAG204_INFO_EXT */
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return ((struct diag204_x_cpu_info *)hdr)->cpu_addr;
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}
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static inline __u64 cpu_info__acc_time(enum diag204_format type, void *hdr)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return ((struct diag204_cpu_info *)hdr)->acc_time;
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else /* DIAG204_INFO_EXT */
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return ((struct diag204_x_cpu_info *)hdr)->acc_time;
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}
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static inline __u64 cpu_info__lp_time(enum diag204_format type, void *hdr)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return ((struct diag204_cpu_info *)hdr)->lp_time;
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else /* DIAG204_INFO_EXT */
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return ((struct diag204_x_cpu_info *)hdr)->lp_time;
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}
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static inline __u64 cpu_info__online_time(enum diag204_format type, void *hdr)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return 0; /* online_time not available in simple info */
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else /* DIAG204_INFO_EXT */
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return ((struct diag204_x_cpu_info *)hdr)->online_time;
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}
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/* Physical header */
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static inline int phys_hdr__size(enum diag204_format type)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return sizeof(struct diag204_phys_hdr);
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else /* DIAG204_INFO_EXT */
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return sizeof(struct diag204_x_phys_hdr);
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}
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static inline __u8 phys_hdr__cpus(enum diag204_format type, void *hdr)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return ((struct diag204_phys_hdr *)hdr)->cpus;
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else /* DIAG204_INFO_EXT */
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return ((struct diag204_x_phys_hdr *)hdr)->cpus;
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}
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/* Physical CPU info block */
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static inline int phys_cpu__size(enum diag204_format type)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return sizeof(struct diag204_phys_cpu);
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else /* DIAG204_INFO_EXT */
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return sizeof(struct diag204_x_phys_cpu);
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}
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static inline __u16 phys_cpu__cpu_addr(enum diag204_format type, void *hdr)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return ((struct diag204_phys_cpu *)hdr)->cpu_addr;
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else /* DIAG204_INFO_EXT */
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return ((struct diag204_x_phys_cpu *)hdr)->cpu_addr;
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}
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static inline __u64 phys_cpu__mgm_time(enum diag204_format type, void *hdr)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return ((struct diag204_phys_cpu *)hdr)->mgm_time;
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else /* DIAG204_INFO_EXT */
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return ((struct diag204_x_phys_cpu *)hdr)->mgm_time;
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}
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static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr)
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{
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if (type == DIAG204_INFO_SIMPLE)
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return ((struct diag204_phys_cpu *)hdr)->ctidx;
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else /* DIAG204_INFO_EXT */
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return ((struct diag204_x_phys_cpu *)hdr)->ctidx;
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}
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/* Diagnose 204 functions */
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/*
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* For the old diag subcode 4 with simple data format we have to use real
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* memory. If we use subcode 6 or 7 with extended data format, we can (and
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* should) use vmalloc, since we need a lot of memory in that case. Currently
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* up to 93 pages!
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*/
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static void diag204_free_buffer(void)
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{
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if (!diag204_buf)
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return;
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if (diag204_buf_vmalloc) {
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vfree(diag204_buf_vmalloc);
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diag204_buf_vmalloc = NULL;
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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 = 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(array_size(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 = 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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static void *diag204_alloc_rbuf(void)
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{
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diag204_buf = (void*)__get_free_pages(GFP_KERNEL,0);
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if (!diag204_buf)
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return ERR_PTR(-ENOMEM);
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diag204_buf_pages = 1;
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return diag204_buf;
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}
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static void *diag204_get_buffer(enum diag204_format fmt, int *pages)
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{
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if (diag204_buf) {
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*pages = diag204_buf_pages;
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return diag204_buf;
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}
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if (fmt == DIAG204_INFO_SIMPLE) {
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*pages = 1;
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return diag204_alloc_rbuf();
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} else {/* DIAG204_INFO_EXT */
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*pages = diag204((unsigned long)DIAG204_SUBC_RSI |
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(unsigned long)DIAG204_INFO_EXT, 0, NULL);
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if (*pages <= 0)
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return ERR_PTR(-ENOSYS);
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else
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return diag204_alloc_vbuf(*pages);
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}
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}
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/*
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* diag204_probe() has to find out, which type of diagnose 204 implementation
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* we have on our machine. Currently there are three possible scanarios:
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* - subcode 4 + simple data format (only one page)
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* - subcode 4-6 + extended data format
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* - subcode 4-7 + extended data format
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*
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* Subcode 5 is used to retrieve the size of the data, provided by subcodes
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* 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition
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* to subcode 6 it provides also information about secondary cpus.
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* In order to get as much information as possible, we first try
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* subcode 7, then 6 and if both fail, we use subcode 4.
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*/
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static int diag204_probe(void)
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{
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void *buf;
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int pages, rc;
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buf = diag204_get_buffer(DIAG204_INFO_EXT, &pages);
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if (!IS_ERR(buf)) {
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if (diag204((unsigned long)DIAG204_SUBC_STIB7 |
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(unsigned long)DIAG204_INFO_EXT, pages, buf) >= 0) {
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diag204_store_sc = DIAG204_SUBC_STIB7;
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diag204_info_type = DIAG204_INFO_EXT;
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goto out;
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}
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if (diag204((unsigned long)DIAG204_SUBC_STIB6 |
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(unsigned long)DIAG204_INFO_EXT, pages, buf) >= 0) {
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diag204_store_sc = DIAG204_SUBC_STIB6;
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diag204_info_type = DIAG204_INFO_EXT;
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goto out;
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}
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diag204_free_buffer();
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}
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/* subcodes 6 and 7 failed, now try subcode 4 */
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buf = diag204_get_buffer(DIAG204_INFO_SIMPLE, &pages);
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if (IS_ERR(buf)) {
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rc = PTR_ERR(buf);
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goto fail_alloc;
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}
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if (diag204((unsigned long)DIAG204_SUBC_STIB4 |
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(unsigned long)DIAG204_INFO_SIMPLE, pages, buf) >= 0) {
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diag204_store_sc = DIAG204_SUBC_STIB4;
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diag204_info_type = DIAG204_INFO_SIMPLE;
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goto out;
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} else {
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rc = -ENOSYS;
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goto fail_store;
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}
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out:
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rc = 0;
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fail_store:
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diag204_free_buffer();
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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, 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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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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/* Diagnose 224 functions */
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static int diag224_get_name_table(void)
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{
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/* memory must be below 2GB */
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diag224_cpu_names = (char *) __get_free_page(GFP_KERNEL | GFP_DMA);
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if (!diag224_cpu_names)
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return -ENOMEM;
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if (diag224(diag224_cpu_names)) {
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free_page((unsigned long) diag224_cpu_names);
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return -EOPNOTSUPP;
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}
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EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16);
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return 0;
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}
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static void diag224_delete_name_table(void)
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{
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free_page((unsigned long) diag224_cpu_names);
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}
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static int diag224_idx2name(int index, char *name)
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{
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memcpy(name, diag224_cpu_names + ((index + 1) * DIAG204_CPU_NAME_LEN),
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DIAG204_CPU_NAME_LEN);
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name[DIAG204_CPU_NAME_LEN] = 0;
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strim(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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static int dbfs_d204_create(void **data, void **data_free_ptr, size_t *size)
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{
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struct dbfs_d204 *d204;
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int rc, buf_size;
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void *base;
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buf_size = PAGE_SIZE * (diag204_buf_pages + 1) + sizeof(d204->hdr);
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base = vzalloc(buf_size);
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if (!base)
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return -ENOMEM;
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d204 = page_align_ptr(base + sizeof(d204->hdr)) - 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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vfree(base);
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return rc;
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}
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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;
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*data_free_ptr = base;
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*size = d204->hdr.len + sizeof(struct dbfs_d204_hdr);
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return 0;
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}
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static struct hypfs_dbfs_file dbfs_file_d204 = {
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.name = "diag_204",
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.data_create = dbfs_d204_create,
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.data_free = vfree,
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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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if (diag204_probe()) {
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pr_err("The hardware system does not support hypfs\n");
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return -ENODATA;
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}
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if (diag204_info_type == DIAG204_INFO_EXT)
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hypfs_dbfs_create_file(&dbfs_file_d204);
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if (MACHINE_IS_LPAR) {
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rc = diag224_get_name_table();
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if (rc) {
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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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debugfs_remove(dbfs_d204_file);
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return rc;
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}
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}
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return 0;
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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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hypfs_dbfs_remove_file(&dbfs_file_d204);
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}
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/*
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* Functions to create the directory structure
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* *******************************************
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*/
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static int hypfs_create_cpu_files(struct dentry *cpus_dir, void *cpu_info)
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{
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struct dentry *cpu_dir;
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char buffer[TMP_SIZE];
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void *rc;
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snprintf(buffer, TMP_SIZE, "%d", cpu_info__cpu_addr(diag204_info_type,
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cpu_info));
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cpu_dir = hypfs_mkdir(cpus_dir, buffer);
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rc = hypfs_create_u64(cpu_dir, "mgmtime",
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cpu_info__acc_time(diag204_info_type, cpu_info) -
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cpu_info__lp_time(diag204_info_type, cpu_info));
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|
if (IS_ERR(rc))
|
|
return PTR_ERR(rc);
|
|
rc = hypfs_create_u64(cpu_dir, "cputime",
|
|
cpu_info__lp_time(diag204_info_type, cpu_info));
|
|
if (IS_ERR(rc))
|
|
return PTR_ERR(rc);
|
|
if (diag204_info_type == DIAG204_INFO_EXT) {
|
|
rc = hypfs_create_u64(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(cpu_dir, "type", buffer);
|
|
return PTR_ERR_OR_ZERO(rc);
|
|
}
|
|
|
|
static void *hypfs_create_lpar_files(struct dentry *systems_dir, void *part_hdr)
|
|
{
|
|
struct dentry *cpus_dir;
|
|
struct dentry *lpar_dir;
|
|
char lpar_name[DIAG204_LPAR_NAME_LEN + 1];
|
|
void *cpu_info;
|
|
int i;
|
|
|
|
part_hdr__part_name(diag204_info_type, part_hdr, lpar_name);
|
|
lpar_name[DIAG204_LPAR_NAME_LEN] = 0;
|
|
lpar_dir = hypfs_mkdir(systems_dir, lpar_name);
|
|
if (IS_ERR(lpar_dir))
|
|
return lpar_dir;
|
|
cpus_dir = hypfs_mkdir(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__rcpus(diag204_info_type, part_hdr); i++) {
|
|
int rc;
|
|
rc = hypfs_create_cpu_files(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 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(cpus_dir, buffer);
|
|
if (IS_ERR(cpu_dir))
|
|
return PTR_ERR(cpu_dir);
|
|
rc = hypfs_create_u64(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(cpu_dir, "type", buffer);
|
|
return PTR_ERR_OR_ZERO(rc);
|
|
}
|
|
|
|
static void *hypfs_create_phys_files(struct dentry *parent_dir, void *phys_hdr)
|
|
{
|
|
int i;
|
|
void *cpu_info;
|
|
struct dentry *cpus_dir;
|
|
|
|
cpus_dir = hypfs_mkdir(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(cpus_dir, cpu_info);
|
|
if (rc)
|
|
return ERR_PTR(rc);
|
|
cpu_info += phys_cpu__size(diag204_info_type);
|
|
}
|
|
return cpu_info;
|
|
}
|
|
|
|
int hypfs_diag_create_files(struct dentry *root)
|
|
{
|
|
struct dentry *systems_dir, *hyp_dir;
|
|
void *time_hdr, *part_hdr;
|
|
int i, rc;
|
|
void *buffer, *ptr;
|
|
|
|
buffer = diag204_store();
|
|
if (IS_ERR(buffer))
|
|
return PTR_ERR(buffer);
|
|
|
|
systems_dir = hypfs_mkdir(root, "systems");
|
|
if (IS_ERR(systems_dir)) {
|
|
rc = PTR_ERR(systems_dir);
|
|
goto err_out;
|
|
}
|
|
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(systems_dir, part_hdr);
|
|
if (IS_ERR(part_hdr)) {
|
|
rc = PTR_ERR(part_hdr);
|
|
goto err_out;
|
|
}
|
|
}
|
|
if (info_blk_hdr__flags(diag204_info_type, time_hdr) &
|
|
DIAG204_LPAR_PHYS_FLG) {
|
|
ptr = hypfs_create_phys_files(root, part_hdr);
|
|
if (IS_ERR(ptr)) {
|
|
rc = PTR_ERR(ptr);
|
|
goto err_out;
|
|
}
|
|
}
|
|
hyp_dir = hypfs_mkdir(root, "hyp");
|
|
if (IS_ERR(hyp_dir)) {
|
|
rc = PTR_ERR(hyp_dir);
|
|
goto err_out;
|
|
}
|
|
ptr = hypfs_create_str(hyp_dir, "type", "LPAR Hypervisor");
|
|
if (IS_ERR(ptr)) {
|
|
rc = PTR_ERR(ptr);
|
|
goto err_out;
|
|
}
|
|
rc = 0;
|
|
|
|
err_out:
|
|
return rc;
|
|
}
|