2 * Hypervisor filesystem for Linux on s390
4 * Diag 0C implementation
6 * Copyright IBM Corp. 2014
9 #include <linux/slab.h>
10 #include <linux/cpu.h>
11 #include <asm/hypfs.h>
14 #define DBFS_D0C_HDR_VERSION 0
17 * Execute diagnose 0c in 31 bit mode
19 static void diag0c(struct hypfs_diag0c_entry *entry)
25 : /* no output register */
31 * Get hypfs_diag0c_entry from CPU vector and store diag0c data
33 static void diag0c_fn(void *data)
35 diag0c(((void **) data)[smp_processor_id()]);
39 * Allocate buffer and store diag 0c data
41 static void *diag0c_store(unsigned int *count)
43 struct hypfs_diag0c_data *diag0c_data;
44 unsigned int cpu_count, cpu, i;
48 cpu_count = num_online_cpus();
49 cpu_vec = kmalloc(sizeof(*cpu_vec) * num_possible_cpus(), GFP_KERNEL);
51 goto fail_put_online_cpus;
52 /* Note: Diag 0c needs 8 byte alignment and real storage */
53 diag0c_data = kzalloc(sizeof(struct hypfs_diag0c_hdr) +
54 cpu_count * sizeof(struct hypfs_diag0c_entry),
55 GFP_KERNEL | GFP_DMA);
57 goto fail_kfree_cpu_vec;
59 /* Fill CPU vector for each online CPU */
60 for_each_online_cpu(cpu) {
61 diag0c_data->entry[i].cpu = cpu;
62 cpu_vec[cpu] = &diag0c_data->entry[i++];
64 /* Collect data all CPUs */
65 on_each_cpu(diag0c_fn, cpu_vec, 1);
75 return ERR_PTR(-ENOMEM);
79 * Hypfs DBFS callback: Free diag 0c data
81 static void dbfs_diag0c_free(const void *data)
87 * Hypfs DBFS callback: Create diag 0c data
89 static int dbfs_diag0c_create(void **data, void **data_free_ptr, size_t *size)
91 struct hypfs_diag0c_data *diag0c_data;
94 diag0c_data = diag0c_store(&count);
95 if (IS_ERR(diag0c_data))
96 return PTR_ERR(diag0c_data);
97 memset(&diag0c_data->hdr, 0, sizeof(diag0c_data->hdr));
98 get_tod_clock_ext(diag0c_data->hdr.tod_ext);
99 diag0c_data->hdr.len = count * sizeof(struct hypfs_diag0c_entry);
100 diag0c_data->hdr.version = DBFS_D0C_HDR_VERSION;
101 diag0c_data->hdr.count = count;
103 *data_free_ptr = diag0c_data;
104 *size = diag0c_data->hdr.len + sizeof(struct hypfs_diag0c_hdr);
109 * Hypfs DBFS file structure
111 static struct hypfs_dbfs_file dbfs_file_0c = {
113 .data_create = dbfs_diag0c_create,
114 .data_free = dbfs_diag0c_free,
118 * Initialize diag 0c interface for z/VM
120 int __init hypfs_diag0c_init(void)
124 return hypfs_dbfs_create_file(&dbfs_file_0c);
128 * Shutdown diag 0c interface for z/VM
130 void hypfs_diag0c_exit(void)
134 hypfs_dbfs_remove_file(&dbfs_file_0c);