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Linux/arch/s390/hypfs/hypfs_diag0c.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Hypervisor filesystem for Linux on s390
  4  *
  5  * Diag 0C implementation
  6  *
  7  * Copyright IBM Corp. 2014
  8  */
  9 
 10 #include <linux/slab.h>
 11 #include <linux/cpu.h>
 12 #include <asm/diag.h>
 13 #include <asm/hypfs.h>
 14 #include "hypfs.h"
 15 
 16 #define DBFS_D0C_HDR_VERSION 0
 17 
 18 /*
 19  * Execute diagnose 0c in 31 bit mode
 20  */
 21 static void diag0c(struct hypfs_diag0c_entry *entry)
 22 {
 23         diag_stat_inc(DIAG_STAT_X00C);
 24         asm volatile (
 25                 "       sam31\n"
 26                 "       diag    %0,%0,0x0c\n"
 27                 "       sam64\n"
 28                 : /* no output register */
 29                 : "a" (entry)
 30                 : "memory");
 31 }
 32 
 33 /*
 34  * Get hypfs_diag0c_entry from CPU vector and store diag0c data
 35  */
 36 static void diag0c_fn(void *data)
 37 {
 38         diag0c(((void **) data)[smp_processor_id()]);
 39 }
 40 
 41 /*
 42  * Allocate buffer and store diag 0c data
 43  */
 44 static void *diag0c_store(unsigned int *count)
 45 {
 46         struct hypfs_diag0c_data *diag0c_data;
 47         unsigned int cpu_count, cpu, i;
 48         void **cpu_vec;
 49 
 50         get_online_cpus();
 51         cpu_count = num_online_cpus();
 52         cpu_vec = kmalloc_array(num_possible_cpus(), sizeof(*cpu_vec),
 53                                 GFP_KERNEL);
 54         if (!cpu_vec)
 55                 goto fail_put_online_cpus;
 56         /* Note: Diag 0c needs 8 byte alignment and real storage */
 57         diag0c_data = kzalloc(sizeof(struct hypfs_diag0c_hdr) +
 58                               cpu_count * sizeof(struct hypfs_diag0c_entry),
 59                               GFP_KERNEL | GFP_DMA);
 60         if (!diag0c_data)
 61                 goto fail_kfree_cpu_vec;
 62         i = 0;
 63         /* Fill CPU vector for each online CPU */
 64         for_each_online_cpu(cpu) {
 65                 diag0c_data->entry[i].cpu = cpu;
 66                 cpu_vec[cpu] = &diag0c_data->entry[i++];
 67         }
 68         /* Collect data all CPUs */
 69         on_each_cpu(diag0c_fn, cpu_vec, 1);
 70         *count = cpu_count;
 71         kfree(cpu_vec);
 72         put_online_cpus();
 73         return diag0c_data;
 74 
 75 fail_kfree_cpu_vec:
 76         kfree(cpu_vec);
 77 fail_put_online_cpus:
 78         put_online_cpus();
 79         return ERR_PTR(-ENOMEM);
 80 }
 81 
 82 /*
 83  * Hypfs DBFS callback: Free diag 0c data
 84  */
 85 static void dbfs_diag0c_free(const void *data)
 86 {
 87         kfree(data);
 88 }
 89 
 90 /*
 91  * Hypfs DBFS callback: Create diag 0c data
 92  */
 93 static int dbfs_diag0c_create(void **data, void **data_free_ptr, size_t *size)
 94 {
 95         struct hypfs_diag0c_data *diag0c_data;
 96         unsigned int count;
 97 
 98         diag0c_data = diag0c_store(&count);
 99         if (IS_ERR(diag0c_data))
100                 return PTR_ERR(diag0c_data);
101         memset(&diag0c_data->hdr, 0, sizeof(diag0c_data->hdr));
102         get_tod_clock_ext(diag0c_data->hdr.tod_ext);
103         diag0c_data->hdr.len = count * sizeof(struct hypfs_diag0c_entry);
104         diag0c_data->hdr.version = DBFS_D0C_HDR_VERSION;
105         diag0c_data->hdr.count = count;
106         *data = diag0c_data;
107         *data_free_ptr = diag0c_data;
108         *size = diag0c_data->hdr.len + sizeof(struct hypfs_diag0c_hdr);
109         return 0;
110 }
111 
112 /*
113  * Hypfs DBFS file structure
114  */
115 static struct hypfs_dbfs_file dbfs_file_0c = {
116         .name           = "diag_0c",
117         .data_create    = dbfs_diag0c_create,
118         .data_free      = dbfs_diag0c_free,
119 };
120 
121 /*
122  * Initialize diag 0c interface for z/VM
123  */
124 int __init hypfs_diag0c_init(void)
125 {
126         if (!MACHINE_IS_VM)
127                 return 0;
128         return hypfs_dbfs_create_file(&dbfs_file_0c);
129 }
130 
131 /*
132  * Shutdown diag 0c interface for z/VM
133  */
134 void hypfs_diag0c_exit(void)
135 {
136         if (!MACHINE_IS_VM)
137                 return;
138         hypfs_dbfs_remove_file(&dbfs_file_0c);
139 }
140 

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