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616 lines
16 KiB
616 lines
16 KiB
// 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 <[email protected]> |
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*/ |
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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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|
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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)) |
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return PTR_ERR(rc); |
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rc = hypfs_create_u64(cpu_dir, "cputime", |
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cpu_info__lp_time(diag204_info_type, cpu_info)); |
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if (IS_ERR(rc)) |
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return PTR_ERR(rc); |
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if (diag204_info_type == DIAG204_INFO_EXT) { |
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rc = hypfs_create_u64(cpu_dir, "onlinetime", |
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cpu_info__online_time(diag204_info_type, |
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cpu_info)); |
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if (IS_ERR(rc)) |
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return PTR_ERR(rc); |
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} |
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diag224_idx2name(cpu_info__ctidx(diag204_info_type, cpu_info), buffer); |
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rc = hypfs_create_str(cpu_dir, "type", buffer); |
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return PTR_ERR_OR_ZERO(rc); |
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} |
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static void *hypfs_create_lpar_files(struct dentry *systems_dir, void *part_hdr) |
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{ |
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struct dentry *cpus_dir; |
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struct dentry *lpar_dir; |
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char lpar_name[DIAG204_LPAR_NAME_LEN + 1]; |
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void *cpu_info; |
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int i; |
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part_hdr__part_name(diag204_info_type, part_hdr, lpar_name); |
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lpar_name[DIAG204_LPAR_NAME_LEN] = 0; |
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lpar_dir = hypfs_mkdir(systems_dir, lpar_name); |
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if (IS_ERR(lpar_dir)) |
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return lpar_dir; |
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cpus_dir = hypfs_mkdir(lpar_dir, "cpus"); |
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if (IS_ERR(cpus_dir)) |
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return cpus_dir; |
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cpu_info = part_hdr + part_hdr__size(diag204_info_type); |
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for (i = 0; i < part_hdr__rcpus(diag204_info_type, part_hdr); i++) { |
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int rc; |
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rc = hypfs_create_cpu_files(cpus_dir, cpu_info); |
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if (rc) |
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return ERR_PTR(rc); |
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cpu_info += cpu_info__size(diag204_info_type); |
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} |
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return cpu_info; |
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} |
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static int hypfs_create_phys_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, "%i", phys_cpu__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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if (IS_ERR(cpu_dir)) |
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return PTR_ERR(cpu_dir); |
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rc = hypfs_create_u64(cpu_dir, "mgmtime", |
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phys_cpu__mgm_time(diag204_info_type, cpu_info)); |
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if (IS_ERR(rc)) |
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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; |
|
}
|
|
|