1 // SPDX-License-Identifier: GPL-2.0
3 * Hypervisor filesystem for Linux on s390. z/VM implementation.
5 * Copyright IBM Corp. 2006
6 * Author(s): Michael Holzheu <holzheu@de.ibm.com>
9 #include <linux/types.h>
10 #include <linux/errno.h>
11 #include <linux/string.h>
12 #include <linux/vmalloc.h>
13 #include <asm/extable.h>
15 #include <asm/ebcdic.h>
16 #include <asm/timex.h>
20 #define DBFS_D2FC_HDR_VERSION 0
22 static char local_guest[] = " ";
23 static char all_guests[] = "* ";
24 static char *all_groups = all_guests;
25 static char *guest_query;
48 char guest_name[NAME_LEN];
51 struct diag2fc_parm_list {
52 char userid[NAME_LEN];
53 char aci_grp[NAME_LEN];
59 static int diag2fc(int size, char* query, void *addr)
61 unsigned long residual_cnt;
63 struct diag2fc_parm_list parm_list;
65 memcpy(parm_list.userid, query, NAME_LEN);
66 ASCEBC(parm_list.userid, NAME_LEN);
67 memcpy(parm_list.aci_grp, all_groups, NAME_LEN);
68 ASCEBC(parm_list.aci_grp, NAME_LEN);
69 parm_list.addr = (unsigned long)addr;
70 parm_list.size = size;
74 diag_stat_inc(DIAG_STAT_X2FC);
79 : "=d" (residual_cnt), "+d" (rc) : "0" (&parm_list) : "memory");
81 if ((rc != 0 ) && (rc != -2))
88 * Allocate buffer for "query" and store diag 2fc at "offset"
90 static void *diag2fc_store(char *query, unsigned int *count, int offset)
96 size = diag2fc(0, query, NULL);
98 return ERR_PTR(-EACCES);
99 data = vmalloc(size + offset);
101 return ERR_PTR(-ENOMEM);
102 if (diag2fc(size, query, data + offset) == 0)
106 *count = (size / sizeof(struct diag2fc_data));
111 static void diag2fc_free(const void *data)
116 #define ATTRIBUTE(dir, name, member) \
119 rc = hypfs_create_u64(dir, name, member); \
121 return PTR_ERR(rc); \
124 static int hypfs_vm_create_guest(struct dentry *systems_dir,
125 struct diag2fc_data *data)
127 char guest_name[NAME_LEN + 1] = {};
128 struct dentry *guest_dir, *cpus_dir, *samples_dir, *mem_dir;
129 int dedicated_flag, capped_value;
131 capped_value = (data->flags & 0x00000006) >> 1;
132 dedicated_flag = (data->flags & 0x00000008) >> 3;
135 memcpy(guest_name, data->guest_name, NAME_LEN);
136 EBCASC(guest_name, NAME_LEN);
138 guest_dir = hypfs_mkdir(systems_dir, guest_name);
139 if (IS_ERR(guest_dir))
140 return PTR_ERR(guest_dir);
141 ATTRIBUTE(guest_dir, "onlinetime_us", data->el_time);
143 /* logical cpu information */
144 cpus_dir = hypfs_mkdir(guest_dir, "cpus");
145 if (IS_ERR(cpus_dir))
146 return PTR_ERR(cpus_dir);
147 ATTRIBUTE(cpus_dir, "cputime_us", data->used_cpu);
148 ATTRIBUTE(cpus_dir, "capped", capped_value);
149 ATTRIBUTE(cpus_dir, "dedicated", dedicated_flag);
150 ATTRIBUTE(cpus_dir, "count", data->vcpus);
152 * Note: The "weight_min" attribute got the wrong name.
153 * The value represents the number of non-stopped (operating)
156 ATTRIBUTE(cpus_dir, "weight_min", data->ocpus);
157 ATTRIBUTE(cpus_dir, "weight_max", data->cpu_max);
158 ATTRIBUTE(cpus_dir, "weight_cur", data->cpu_shares);
160 /* memory information */
161 mem_dir = hypfs_mkdir(guest_dir, "mem");
163 return PTR_ERR(mem_dir);
164 ATTRIBUTE(mem_dir, "min_KiB", data->mem_min_kb);
165 ATTRIBUTE(mem_dir, "max_KiB", data->mem_max_kb);
166 ATTRIBUTE(mem_dir, "used_KiB", data->mem_used_kb);
167 ATTRIBUTE(mem_dir, "share_KiB", data->mem_share_kb);
170 samples_dir = hypfs_mkdir(guest_dir, "samples");
171 if (IS_ERR(samples_dir))
172 return PTR_ERR(samples_dir);
173 ATTRIBUTE(samples_dir, "cpu_using", data->cpu_use_samp);
174 ATTRIBUTE(samples_dir, "cpu_delay", data->cpu_delay_samp);
175 ATTRIBUTE(samples_dir, "mem_delay", data->page_wait_samp);
176 ATTRIBUTE(samples_dir, "idle", data->idle_samp);
177 ATTRIBUTE(samples_dir, "other", data->other_samp);
178 ATTRIBUTE(samples_dir, "total", data->total_samp);
182 int hypfs_vm_create_files(struct dentry *root)
184 struct dentry *dir, *file;
185 struct diag2fc_data *data;
186 unsigned int count = 0;
189 data = diag2fc_store(guest_query, &count, 0);
191 return PTR_ERR(data);
193 /* Hypervisor Info */
194 dir = hypfs_mkdir(root, "hyp");
199 file = hypfs_create_str(dir, "type", "z/VM Hypervisor");
206 dir = hypfs_mkdir(root, "cpus");
211 file = hypfs_create_u64(dir, "count", data->lcpus);
218 dir = hypfs_mkdir(root, "systems");
224 for (i = 0; i < count; i++) {
225 rc = hypfs_vm_create_guest(dir, &(data[i]));
237 struct dbfs_d2fc_hdr {
238 u64 len; /* Length of d2fc buffer without header */
239 u16 version; /* Version of header */
240 union tod_clock tod_ext; /* TOD clock for d2fc */
241 u64 count; /* Number of VM guests in d2fc buffer */
243 } __attribute__ ((packed));
246 struct dbfs_d2fc_hdr hdr; /* 64 byte header */
247 char buf[]; /* d2fc buffer */
248 } __attribute__ ((packed));
250 static int dbfs_diag2fc_create(void **data, void **data_free_ptr, size_t *size)
252 struct dbfs_d2fc *d2fc;
255 d2fc = diag2fc_store(guest_query, &count, sizeof(d2fc->hdr));
257 return PTR_ERR(d2fc);
258 store_tod_clock_ext(&d2fc->hdr.tod_ext);
259 d2fc->hdr.len = count * sizeof(struct diag2fc_data);
260 d2fc->hdr.version = DBFS_D2FC_HDR_VERSION;
261 d2fc->hdr.count = count;
262 memset(&d2fc->hdr.reserved, 0, sizeof(d2fc->hdr.reserved));
264 *data_free_ptr = d2fc;
265 *size = d2fc->hdr.len + sizeof(struct dbfs_d2fc_hdr);
269 static struct hypfs_dbfs_file dbfs_file_2fc = {
271 .data_create = dbfs_diag2fc_create,
272 .data_free = diag2fc_free,
275 int hypfs_vm_init(void)
279 if (diag2fc(0, all_guests, NULL) > 0)
280 guest_query = all_guests;
281 else if (diag2fc(0, local_guest, NULL) > 0)
282 guest_query = local_guest;
285 hypfs_dbfs_create_file(&dbfs_file_2fc);
289 void hypfs_vm_exit(void)
293 hypfs_dbfs_remove_file(&dbfs_file_2fc);