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Linux/arch/s390/hypfs/hypfs_vm.c

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  1 /*
  2  *    Hypervisor filesystem for Linux on s390. z/VM implementation.
  3  *
  4  *    Copyright IBM Corp. 2006
  5  *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
  6  */
  7 
  8 #include <linux/types.h>
  9 #include <linux/errno.h>
 10 #include <linux/string.h>
 11 #include <linux/vmalloc.h>
 12 #include <asm/diag.h>
 13 #include <asm/ebcdic.h>
 14 #include <asm/timex.h>
 15 #include "hypfs.h"
 16 
 17 #define NAME_LEN 8
 18 #define DBFS_D2FC_HDR_VERSION 0
 19 
 20 static char local_guest[] = "        ";
 21 static char all_guests[] = "*       ";
 22 static char *guest_query;
 23 
 24 struct diag2fc_data {
 25         __u32 version;
 26         __u32 flags;
 27         __u64 used_cpu;
 28         __u64 el_time;
 29         __u64 mem_min_kb;
 30         __u64 mem_max_kb;
 31         __u64 mem_share_kb;
 32         __u64 mem_used_kb;
 33         __u32 pcpus;
 34         __u32 lcpus;
 35         __u32 vcpus;
 36         __u32 ocpus;
 37         __u32 cpu_max;
 38         __u32 cpu_shares;
 39         __u32 cpu_use_samp;
 40         __u32 cpu_delay_samp;
 41         __u32 page_wait_samp;
 42         __u32 idle_samp;
 43         __u32 other_samp;
 44         __u32 total_samp;
 45         char  guest_name[NAME_LEN];
 46 };
 47 
 48 struct diag2fc_parm_list {
 49         char userid[NAME_LEN];
 50         char aci_grp[NAME_LEN];
 51         __u64 addr;
 52         __u32 size;
 53         __u32 fmt;
 54 };
 55 
 56 static int diag2fc(int size, char* query, void *addr)
 57 {
 58         unsigned long residual_cnt;
 59         unsigned long rc;
 60         struct diag2fc_parm_list parm_list;
 61 
 62         memcpy(parm_list.userid, query, NAME_LEN);
 63         ASCEBC(parm_list.userid, NAME_LEN);
 64         parm_list.addr = (unsigned long) addr ;
 65         parm_list.size = size;
 66         parm_list.fmt = 0x02;
 67         memset(parm_list.aci_grp, 0x40, NAME_LEN);
 68         rc = -1;
 69 
 70         diag_stat_inc(DIAG_STAT_X2FC);
 71         asm volatile(
 72                 "       diag    %0,%1,0x2fc\n"
 73                 "0:\n"
 74                 EX_TABLE(0b,0b)
 75                 : "=d" (residual_cnt), "+d" (rc) : "" (&parm_list) : "memory");
 76 
 77         if ((rc != 0 ) && (rc != -2))
 78                 return rc;
 79         else
 80                 return -residual_cnt;
 81 }
 82 
 83 /*
 84  * Allocate buffer for "query" and store diag 2fc at "offset"
 85  */
 86 static void *diag2fc_store(char *query, unsigned int *count, int offset)
 87 {
 88         void *data;
 89         int size;
 90 
 91         do {
 92                 size = diag2fc(0, query, NULL);
 93                 if (size < 0)
 94                         return ERR_PTR(-EACCES);
 95                 data = vmalloc(size + offset);
 96                 if (!data)
 97                         return ERR_PTR(-ENOMEM);
 98                 if (diag2fc(size, query, data + offset) == 0)
 99                         break;
100                 vfree(data);
101         } while (1);
102         *count = (size / sizeof(struct diag2fc_data));
103 
104         return data;
105 }
106 
107 static void diag2fc_free(const void *data)
108 {
109         vfree(data);
110 }
111 
112 #define ATTRIBUTE(dir, name, member) \
113 do { \
114         void *rc; \
115         rc = hypfs_create_u64(dir, name, member); \
116         if (IS_ERR(rc)) \
117                 return PTR_ERR(rc); \
118 } while(0)
119 
120 static int hpyfs_vm_create_guest(struct dentry *systems_dir,
121                                  struct diag2fc_data *data)
122 {
123         char guest_name[NAME_LEN + 1] = {};
124         struct dentry *guest_dir, *cpus_dir, *samples_dir, *mem_dir;
125         int dedicated_flag, capped_value;
126 
127         capped_value = (data->flags & 0x00000006) >> 1;
128         dedicated_flag = (data->flags & 0x00000008) >> 3;
129 
130         /* guest dir */
131         memcpy(guest_name, data->guest_name, NAME_LEN);
132         EBCASC(guest_name, NAME_LEN);
133         strim(guest_name);
134         guest_dir = hypfs_mkdir(systems_dir, guest_name);
135         if (IS_ERR(guest_dir))
136                 return PTR_ERR(guest_dir);
137         ATTRIBUTE(guest_dir, "onlinetime_us", data->el_time);
138 
139         /* logical cpu information */
140         cpus_dir = hypfs_mkdir(guest_dir, "cpus");
141         if (IS_ERR(cpus_dir))
142                 return PTR_ERR(cpus_dir);
143         ATTRIBUTE(cpus_dir, "cputime_us", data->used_cpu);
144         ATTRIBUTE(cpus_dir, "capped", capped_value);
145         ATTRIBUTE(cpus_dir, "dedicated", dedicated_flag);
146         ATTRIBUTE(cpus_dir, "count", data->vcpus);
147         /*
148          * Note: The "weight_min" attribute got the wrong name.
149          * The value represents the number of non-stopped (operating)
150          * CPUS.
151          */
152         ATTRIBUTE(cpus_dir, "weight_min", data->ocpus);
153         ATTRIBUTE(cpus_dir, "weight_max", data->cpu_max);
154         ATTRIBUTE(cpus_dir, "weight_cur", data->cpu_shares);
155 
156         /* memory information */
157         mem_dir = hypfs_mkdir(guest_dir, "mem");
158         if (IS_ERR(mem_dir))
159                 return PTR_ERR(mem_dir);
160         ATTRIBUTE(mem_dir, "min_KiB", data->mem_min_kb);
161         ATTRIBUTE(mem_dir, "max_KiB", data->mem_max_kb);
162         ATTRIBUTE(mem_dir, "used_KiB", data->mem_used_kb);
163         ATTRIBUTE(mem_dir, "share_KiB", data->mem_share_kb);
164 
165         /* samples */
166         samples_dir = hypfs_mkdir(guest_dir, "samples");
167         if (IS_ERR(samples_dir))
168                 return PTR_ERR(samples_dir);
169         ATTRIBUTE(samples_dir, "cpu_using", data->cpu_use_samp);
170         ATTRIBUTE(samples_dir, "cpu_delay", data->cpu_delay_samp);
171         ATTRIBUTE(samples_dir, "mem_delay", data->page_wait_samp);
172         ATTRIBUTE(samples_dir, "idle", data->idle_samp);
173         ATTRIBUTE(samples_dir, "other", data->other_samp);
174         ATTRIBUTE(samples_dir, "total", data->total_samp);
175         return 0;
176 }
177 
178 int hypfs_vm_create_files(struct dentry *root)
179 {
180         struct dentry *dir, *file;
181         struct diag2fc_data *data;
182         unsigned int count = 0;
183         int rc, i;
184 
185         data = diag2fc_store(guest_query, &count, 0);
186         if (IS_ERR(data))
187                 return PTR_ERR(data);
188 
189         /* Hpervisor Info */
190         dir = hypfs_mkdir(root, "hyp");
191         if (IS_ERR(dir)) {
192                 rc = PTR_ERR(dir);
193                 goto failed;
194         }
195         file = hypfs_create_str(dir, "type", "z/VM Hypervisor");
196         if (IS_ERR(file)) {
197                 rc = PTR_ERR(file);
198                 goto failed;
199         }
200 
201         /* physical cpus */
202         dir = hypfs_mkdir(root, "cpus");
203         if (IS_ERR(dir)) {
204                 rc = PTR_ERR(dir);
205                 goto failed;
206         }
207         file = hypfs_create_u64(dir, "count", data->lcpus);
208         if (IS_ERR(file)) {
209                 rc = PTR_ERR(file);
210                 goto failed;
211         }
212 
213         /* guests */
214         dir = hypfs_mkdir(root, "systems");
215         if (IS_ERR(dir)) {
216                 rc = PTR_ERR(dir);
217                 goto failed;
218         }
219 
220         for (i = 0; i < count; i++) {
221                 rc = hpyfs_vm_create_guest(dir, &(data[i]));
222                 if (rc)
223                         goto failed;
224         }
225         diag2fc_free(data);
226         return 0;
227 
228 failed:
229         diag2fc_free(data);
230         return rc;
231 }
232 
233 struct dbfs_d2fc_hdr {
234         u64     len;            /* Length of d2fc buffer without header */
235         u16     version;        /* Version of header */
236         char    tod_ext[STORE_CLOCK_EXT_SIZE]; /* TOD clock for d2fc */
237         u64     count;          /* Number of VM guests in d2fc buffer */
238         char    reserved[30];
239 } __attribute__ ((packed));
240 
241 struct dbfs_d2fc {
242         struct dbfs_d2fc_hdr    hdr;    /* 64 byte header */
243         char                    buf[];  /* d2fc buffer */
244 } __attribute__ ((packed));
245 
246 static int dbfs_diag2fc_create(void **data, void **data_free_ptr, size_t *size)
247 {
248         struct dbfs_d2fc *d2fc;
249         unsigned int count;
250 
251         d2fc = diag2fc_store(guest_query, &count, sizeof(d2fc->hdr));
252         if (IS_ERR(d2fc))
253                 return PTR_ERR(d2fc);
254         get_tod_clock_ext(d2fc->hdr.tod_ext);
255         d2fc->hdr.len = count * sizeof(struct diag2fc_data);
256         d2fc->hdr.version = DBFS_D2FC_HDR_VERSION;
257         d2fc->hdr.count = count;
258         memset(&d2fc->hdr.reserved, 0, sizeof(d2fc->hdr.reserved));
259         *data = d2fc;
260         *data_free_ptr = d2fc;
261         *size = d2fc->hdr.len + sizeof(struct dbfs_d2fc_hdr);
262         return 0;
263 }
264 
265 static struct hypfs_dbfs_file dbfs_file_2fc = {
266         .name           = "diag_2fc",
267         .data_create    = dbfs_diag2fc_create,
268         .data_free      = diag2fc_free,
269 };
270 
271 int hypfs_vm_init(void)
272 {
273         if (!MACHINE_IS_VM)
274                 return 0;
275         if (diag2fc(0, all_guests, NULL) > 0)
276                 guest_query = all_guests;
277         else if (diag2fc(0, local_guest, NULL) > 0)
278                 guest_query = local_guest;
279         else
280                 return -EACCES;
281         return hypfs_dbfs_create_file(&dbfs_file_2fc);
282 }
283 
284 void hypfs_vm_exit(void)
285 {
286         if (!MACHINE_IS_VM)
287                 return;
288         hypfs_dbfs_remove_file(&dbfs_file_2fc);
289 }
290 

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