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/diag.h> 14 #include <asm/ebcdic.h> 15 #include <asm/timex.h> 16 #include "hypfs.h" 17 18 #define NAME_LEN 8 19 #define DBFS_D2FC_HDR_VERSION 0 20 21 static char local_guest[] = " "; 22 static char all_guests[] = "* "; 23 static char *guest_query; 24 25 struct diag2fc_data { 26 __u32 version; 27 __u32 flags; 28 __u64 used_cpu; 29 __u64 el_time; 30 __u64 mem_min_kb; 31 __u64 mem_max_kb; 32 __u64 mem_share_kb; 33 __u64 mem_used_kb; 34 __u32 pcpus; 35 __u32 lcpus; 36 __u32 vcpus; 37 __u32 ocpus; 38 __u32 cpu_max; 39 __u32 cpu_shares; 40 __u32 cpu_use_samp; 41 __u32 cpu_delay_samp; 42 __u32 page_wait_samp; 43 __u32 idle_samp; 44 __u32 other_samp; 45 __u32 total_samp; 46 char guest_name[NAME_LEN]; 47 }; 48 49 struct diag2fc_parm_list { 50 char userid[NAME_LEN]; 51 char aci_grp[NAME_LEN]; 52 __u64 addr; 53 __u32 size; 54 __u32 fmt; 55 }; 56 57 static int diag2fc(int size, char* query, void *addr) 58 { 59 unsigned long residual_cnt; 60 unsigned long rc; 61 struct diag2fc_parm_list parm_list; 62 63 memcpy(parm_list.userid, query, NAME_LEN); 64 ASCEBC(parm_list.userid, NAME_LEN); 65 parm_list.addr = (unsigned long) addr ; 66 parm_list.size = size; 67 parm_list.fmt = 0x02; 68 memset(parm_list.aci_grp, 0x40, NAME_LEN); 69 rc = -1; 70 71 diag_stat_inc(DIAG_STAT_X2FC); 72 asm volatile( 73 " diag %0,%1,0x2fc\n" 74 "0: nopr %%r7\n" 75 EX_TABLE(0b,0b) 76 : "=d" (residual_cnt), "+d" (rc) : "0" (&parm_list) : "memory"); 77 78 if ((rc != 0 ) && (rc != -2)) 79 return rc; 80 else 81 return -residual_cnt; 82 } 83 84 /* 85 * Allocate buffer for "query" and store diag 2fc at "offset" 86 */ 87 static void *diag2fc_store(char *query, unsigned int *count, int offset) 88 { 89 void *data; 90 int size; 91 92 do { 93 size = diag2fc(0, query, NULL); 94 if (size < 0) 95 return ERR_PTR(-EACCES); 96 data = vmalloc(size + offset); 97 if (!data) 98 return ERR_PTR(-ENOMEM); 99 if (diag2fc(size, query, data + offset) == 0) 100 break; 101 vfree(data); 102 } while (1); 103 *count = (size / sizeof(struct diag2fc_data)); 104 105 return data; 106 } 107 108 static void diag2fc_free(const void *data) 109 { 110 vfree(data); 111 } 112 113 #define ATTRIBUTE(dir, name, member) \ 114 do { \ 115 void *rc; \ 116 rc = hypfs_create_u64(dir, name, member); \ 117 if (IS_ERR(rc)) \ 118 return PTR_ERR(rc); \ 119 } while(0) 120 121 static int hypfs_vm_create_guest(struct dentry *systems_dir, 122 struct diag2fc_data *data) 123 { 124 char guest_name[NAME_LEN + 1] = {}; 125 struct dentry *guest_dir, *cpus_dir, *samples_dir, *mem_dir; 126 int dedicated_flag, capped_value; 127 128 capped_value = (data->flags & 0x00000006) >> 1; 129 dedicated_flag = (data->flags & 0x00000008) >> 3; 130 131 /* guest dir */ 132 memcpy(guest_name, data->guest_name, NAME_LEN); 133 EBCASC(guest_name, NAME_LEN); 134 strim(guest_name); 135 guest_dir = hypfs_mkdir(systems_dir, guest_name); 136 if (IS_ERR(guest_dir)) 137 return PTR_ERR(guest_dir); 138 ATTRIBUTE(guest_dir, "onlinetime_us", data->el_time); 139 140 /* logical cpu information */ 141 cpus_dir = hypfs_mkdir(guest_dir, "cpus"); 142 if (IS_ERR(cpus_dir)) 143 return PTR_ERR(cpus_dir); 144 ATTRIBUTE(cpus_dir, "cputime_us", data->used_cpu); 145 ATTRIBUTE(cpus_dir, "capped", capped_value); 146 ATTRIBUTE(cpus_dir, "dedicated", dedicated_flag); 147 ATTRIBUTE(cpus_dir, "count", data->vcpus); 148 /* 149 * Note: The "weight_min" attribute got the wrong name. 150 * The value represents the number of non-stopped (operating) 151 * CPUS. 152 */ 153 ATTRIBUTE(cpus_dir, "weight_min", data->ocpus); 154 ATTRIBUTE(cpus_dir, "weight_max", data->cpu_max); 155 ATTRIBUTE(cpus_dir, "weight_cur", data->cpu_shares); 156 157 /* memory information */ 158 mem_dir = hypfs_mkdir(guest_dir, "mem"); 159 if (IS_ERR(mem_dir)) 160 return PTR_ERR(mem_dir); 161 ATTRIBUTE(mem_dir, "min_KiB", data->mem_min_kb); 162 ATTRIBUTE(mem_dir, "max_KiB", data->mem_max_kb); 163 ATTRIBUTE(mem_dir, "used_KiB", data->mem_used_kb); 164 ATTRIBUTE(mem_dir, "share_KiB", data->mem_share_kb); 165 166 /* samples */ 167 samples_dir = hypfs_mkdir(guest_dir, "samples"); 168 if (IS_ERR(samples_dir)) 169 return PTR_ERR(samples_dir); 170 ATTRIBUTE(samples_dir, "cpu_using", data->cpu_use_samp); 171 ATTRIBUTE(samples_dir, "cpu_delay", data->cpu_delay_samp); 172 ATTRIBUTE(samples_dir, "mem_delay", data->page_wait_samp); 173 ATTRIBUTE(samples_dir, "idle", data->idle_samp); 174 ATTRIBUTE(samples_dir, "other", data->other_samp); 175 ATTRIBUTE(samples_dir, "total", data->total_samp); 176 return 0; 177 } 178 179 int hypfs_vm_create_files(struct dentry *root) 180 { 181 struct dentry *dir, *file; 182 struct diag2fc_data *data; 183 unsigned int count = 0; 184 int rc, i; 185 186 data = diag2fc_store(guest_query, &count, 0); 187 if (IS_ERR(data)) 188 return PTR_ERR(data); 189 190 /* Hpervisor Info */ 191 dir = hypfs_mkdir(root, "hyp"); 192 if (IS_ERR(dir)) { 193 rc = PTR_ERR(dir); 194 goto failed; 195 } 196 file = hypfs_create_str(dir, "type", "z/VM Hypervisor"); 197 if (IS_ERR(file)) { 198 rc = PTR_ERR(file); 199 goto failed; 200 } 201 202 /* physical cpus */ 203 dir = hypfs_mkdir(root, "cpus"); 204 if (IS_ERR(dir)) { 205 rc = PTR_ERR(dir); 206 goto failed; 207 } 208 file = hypfs_create_u64(dir, "count", data->lcpus); 209 if (IS_ERR(file)) { 210 rc = PTR_ERR(file); 211 goto failed; 212 } 213 214 /* guests */ 215 dir = hypfs_mkdir(root, "systems"); 216 if (IS_ERR(dir)) { 217 rc = PTR_ERR(dir); 218 goto failed; 219 } 220 221 for (i = 0; i < count; i++) { 222 rc = hypfs_vm_create_guest(dir, &(data[i])); 223 if (rc) 224 goto failed; 225 } 226 diag2fc_free(data); 227 return 0; 228 229 failed: 230 diag2fc_free(data); 231 return rc; 232 } 233 234 struct dbfs_d2fc_hdr { 235 u64 len; /* Length of d2fc buffer without header */ 236 u16 version; /* Version of header */ 237 union tod_clock tod_ext; /* TOD clock for d2fc */ 238 u64 count; /* Number of VM guests in d2fc buffer */ 239 char reserved[30]; 240 } __attribute__ ((packed)); 241 242 struct dbfs_d2fc { 243 struct dbfs_d2fc_hdr hdr; /* 64 byte header */ 244 char buf[]; /* d2fc buffer */ 245 } __attribute__ ((packed)); 246 247 static int dbfs_diag2fc_create(void **data, void **data_free_ptr, size_t *size) 248 { 249 struct dbfs_d2fc *d2fc; 250 unsigned int count; 251 252 d2fc = diag2fc_store(guest_query, &count, sizeof(d2fc->hdr)); 253 if (IS_ERR(d2fc)) 254 return PTR_ERR(d2fc); 255 store_tod_clock_ext(&d2fc->hdr.tod_ext); 256 d2fc->hdr.len = count * sizeof(struct diag2fc_data); 257 d2fc->hdr.version = DBFS_D2FC_HDR_VERSION; 258 d2fc->hdr.count = count; 259 memset(&d2fc->hdr.reserved, 0, sizeof(d2fc->hdr.reserved)); 260 *data = d2fc; 261 *data_free_ptr = d2fc; 262 *size = d2fc->hdr.len + sizeof(struct dbfs_d2fc_hdr); 263 return 0; 264 } 265 266 static struct hypfs_dbfs_file dbfs_file_2fc = { 267 .name = "diag_2fc", 268 .data_create = dbfs_diag2fc_create, 269 .data_free = diag2fc_free, 270 }; 271 272 int hypfs_vm_init(void) 273 { 274 if (!MACHINE_IS_VM) 275 return 0; 276 if (diag2fc(0, all_guests, NULL) > 0) 277 guest_query = all_guests; 278 else if (diag2fc(0, local_guest, NULL) > 0) 279 guest_query = local_guest; 280 else 281 return -EACCES; 282 hypfs_dbfs_create_file(&dbfs_file_2fc); 283 return 0; 284 } 285 286 void hypfs_vm_exit(void) 287 { 288 if (!MACHINE_IS_VM) 289 return; 290 hypfs_dbfs_remove_file(&dbfs_file_2fc); 291 } 292