1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Hypervisor filesystem for Linux on s390. z/VM implementation. 4 * 5 * Copyright IBM Corp. 2006 6 * Author(s): Michael Holzheu <holzheu@de.ibm.com> 7 */ 8 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> 14 #include <asm/diag.h> 15 #include <asm/ebcdic.h> 16 #include <asm/timex.h> 17 #include "hypfs.h" 18 19 #define NAME_LEN 8 20 #define DBFS_D2FC_HDR_VERSION 0 21 22 static char local_guest[] = " "; 23 static char all_guests[] = "* "; 24 static char *all_groups = all_guests; 25 static char *guest_query; 26 27 struct diag2fc_data { 28 __u32 version; 29 __u32 flags; 30 __u64 used_cpu; 31 __u64 el_time; 32 __u64 mem_min_kb; 33 __u64 mem_max_kb; 34 __u64 mem_share_kb; 35 __u64 mem_used_kb; 36 __u32 pcpus; 37 __u32 lcpus; 38 __u32 vcpus; 39 __u32 ocpus; 40 __u32 cpu_max; 41 __u32 cpu_shares; 42 __u32 cpu_use_samp; 43 __u32 cpu_delay_samp; 44 __u32 page_wait_samp; 45 __u32 idle_samp; 46 __u32 other_samp; 47 __u32 total_samp; 48 char guest_name[NAME_LEN]; 49 }; 50 51 struct diag2fc_parm_list { 52 char userid[NAME_LEN]; 53 char aci_grp[NAME_LEN]; 54 __u64 addr; 55 __u32 size; 56 __u32 fmt; 57 }; 58 59 static int diag2fc(int size, char* query, void *addr) 60 { 61 unsigned long residual_cnt; 62 unsigned long rc; 63 struct diag2fc_parm_list parm_list; 64 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; 71 parm_list.fmt = 0x02; 72 rc = -1; 73 74 diag_stat_inc(DIAG_STAT_X2FC); 75 asm volatile( 76 " diag %0,%1,0x2fc\n" 77 "0: nopr %%r7\n" 78 EX_TABLE(0b,0b) 79 : "=d" (residual_cnt), "+d" (rc) : "0" (&parm_list) : "memory"); 80 81 if ((rc != 0 ) && (rc != -2)) 82 return rc; 83 else 84 return -residual_cnt; 85 } 86 87 /* 88 * Allocate buffer for "query" and store diag 2fc at "offset" 89 */ 90 static void *diag2fc_store(char *query, unsigned int *count, int offset) 91 { 92 void *data; 93 int size; 94 95 do { 96 size = diag2fc(0, query, NULL); 97 if (size < 0) 98 return ERR_PTR(-EACCES); 99 data = vmalloc(size + offset); 100 if (!data) 101 return ERR_PTR(-ENOMEM); 102 if (diag2fc(size, query, data + offset) == 0) 103 break; 104 vfree(data); 105 } while (1); 106 *count = (size / sizeof(struct diag2fc_data)); 107 108 return data; 109 } 110 111 static void diag2fc_free(const void *data) 112 { 113 vfree(data); 114 } 115 116 #define ATTRIBUTE(dir, name, member) \ 117 do { \ 118 void *rc; \ 119 rc = hypfs_create_u64(dir, name, member); \ 120 if (IS_ERR(rc)) \ 121 return PTR_ERR(rc); \ 122 } while(0) 123 124 static int hypfs_vm_create_guest(struct dentry *systems_dir, 125 struct diag2fc_data *data) 126 { 127 char guest_name[NAME_LEN + 1] = {}; 128 struct dentry *guest_dir, *cpus_dir, *samples_dir, *mem_dir; 129 int dedicated_flag, capped_value; 130 131 capped_value = (data->flags & 0x00000006) >> 1; 132 dedicated_flag = (data->flags & 0x00000008) >> 3; 133 134 /* guest dir */ 135 memcpy(guest_name, data->guest_name, NAME_LEN); 136 EBCASC(guest_name, NAME_LEN); 137 strim(guest_name); 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); 142 143 /* 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); 151 /* 152 * Note: The "weight_min" attribute got the wrong name. 153 * The value represents the number of non-stopped (operating) 154 * CPUS. 155 */ 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); 159 160 /* memory information */ 161 mem_dir = hypfs_mkdir(guest_dir, "mem"); 162 if (IS_ERR(mem_dir)) 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); 168 169 /* samples */ 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); 179 return 0; 180 } 181 182 int hypfs_vm_create_files(struct dentry *root) 183 { 184 struct dentry *dir, *file; 185 struct diag2fc_data *data; 186 unsigned int count = 0; 187 int rc, i; 188 189 data = diag2fc_store(guest_query, &count, 0); 190 if (IS_ERR(data)) 191 return PTR_ERR(data); 192 193 /* Hypervisor Info */ 194 dir = hypfs_mkdir(root, "hyp"); 195 if (IS_ERR(dir)) { 196 rc = PTR_ERR(dir); 197 goto failed; 198 } 199 file = hypfs_create_str(dir, "type", "z/VM Hypervisor"); 200 if (IS_ERR(file)) { 201 rc = PTR_ERR(file); 202 goto failed; 203 } 204 205 /* physical cpus */ 206 dir = hypfs_mkdir(root, "cpus"); 207 if (IS_ERR(dir)) { 208 rc = PTR_ERR(dir); 209 goto failed; 210 } 211 file = hypfs_create_u64(dir, "count", data->lcpus); 212 if (IS_ERR(file)) { 213 rc = PTR_ERR(file); 214 goto failed; 215 } 216 217 /* guests */ 218 dir = hypfs_mkdir(root, "systems"); 219 if (IS_ERR(dir)) { 220 rc = PTR_ERR(dir); 221 goto failed; 222 } 223 224 for (i = 0; i < count; i++) { 225 rc = hypfs_vm_create_guest(dir, &(data[i])); 226 if (rc) 227 goto failed; 228 } 229 diag2fc_free(data); 230 return 0; 231 232 failed: 233 diag2fc_free(data); 234 return rc; 235 } 236 237 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 */ 242 char reserved[30]; 243 } __attribute__ ((packed)); 244 245 struct dbfs_d2fc { 246 struct dbfs_d2fc_hdr hdr; /* 64 byte header */ 247 char buf[]; /* d2fc buffer */ 248 } __attribute__ ((packed)); 249 250 static int dbfs_diag2fc_create(void **data, void **data_free_ptr, size_t *size) 251 { 252 struct dbfs_d2fc *d2fc; 253 unsigned int count; 254 255 d2fc = diag2fc_store(guest_query, &count, sizeof(d2fc->hdr)); 256 if (IS_ERR(d2fc)) 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)); 263 *data = d2fc; 264 *data_free_ptr = d2fc; 265 *size = d2fc->hdr.len + sizeof(struct dbfs_d2fc_hdr); 266 return 0; 267 } 268 269 static struct hypfs_dbfs_file dbfs_file_2fc = { 270 .name = "diag_2fc", 271 .data_create = dbfs_diag2fc_create, 272 .data_free = diag2fc_free, 273 }; 274 275 int hypfs_vm_init(void) 276 { 277 if (!MACHINE_IS_VM) 278 return 0; 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; 283 else 284 return -EACCES; 285 hypfs_dbfs_create_file(&dbfs_file_2fc); 286 return 0; 287 } 288 289 void hypfs_vm_exit(void) 290 { 291 if (!MACHINE_IS_VM) 292 return; 293 hypfs_dbfs_remove_file(&dbfs_file_2fc); 294 } 295