drivers/s390/char/sclp_sdias.c

   1 /*
   2  * Sclp "store data in absolut storage"
   3  *
   4  * Copyright IBM Corp. 2003,2007
   5  * Author(s): Michael Holzheu
   6  */
   7
   8 #include <linux/sched.h>
   9 #include <asm/sclp.h>
  10 #include <asm/debug.h>
  11 #include <asm/ipl.h>
  12 #include "sclp.h"
  13 #include "sclp_rw.h"
  14
  15 #define TRACE(x...) debug_sprintf_event(sdias_dbf, 1, x)
  16 #define ERROR_MSG(x...) printk ( KERN_ALERT "SDIAS: " x )
  17
  18 #define SDIAS_RETRIES 300
  19 #define SDIAS_SLEEP_TICKS 50
  20
  21 #define EQ_STORE_DATA   0x0
  22 #define EQ_SIZE         0x1
  23 #define DI_FCP_DUMP     0x0
  24 #define ASA_SIZE_32     0x0
  25 #define ASA_SIZE_64     0x1
  26 #define EVSTATE_ALL_STORED      0x0
  27 #define EVSTATE_NO_DATA         0x3
  28 #define EVSTATE_PART_STORED     0x10
  29
  30 static struct debug_info *sdias_dbf;
  31
  32 static struct sclp_register sclp_sdias_register = {
  33         .send_mask = EVTYP_SDIAS_MASK,
  34 };
  35
  36 struct sdias_evbuf {
  37         struct  evbuf_header hdr;
  38         u8      event_qual;
  39         u8      data_id;
  40         u64     reserved2;
  41         u32     event_id;
  42         u16     reserved3;
  43         u8      asa_size;
  44         u8      event_status;
  45         u32     reserved4;
  46         u32     blk_cnt;
  47         u64     asa;
  48         u32     reserved5;
  49         u32     fbn;
  50         u32     reserved6;
  51         u32     lbn;
  52         u16     reserved7;
  53         u16     dbs;
  54 } __attribute__((packed));
  55
  56 struct sdias_sccb {
  57         struct sccb_header  hdr;
  58         struct sdias_evbuf  evbuf;
  59 } __attribute__((packed));
  60
  61 static struct sdias_sccb sccb __attribute__((aligned(4096)));
  62
  63 static int sclp_req_done;
  64 static wait_queue_head_t sdias_wq;
  65 static DEFINE_MUTEX(sdias_mutex);
  66
  67 static void sdias_callback(struct sclp_req *request, void *data)
  68 {
  69         struct sdias_sccb *cbsccb;
  70
  71         cbsccb = (struct sdias_sccb *) request->sccb;
  72         sclp_req_done = 1;
  73         wake_up(&sdias_wq); /* Inform caller, that request is complete */
  74         TRACE("callback done\n");
  75 }
  76
  77 static int sdias_sclp_send(struct sclp_req *req)
  78 {
  79         int retries;
  80         int rc;
  81
  82         for (retries = SDIAS_RETRIES; retries; retries--) {
  83                 sclp_req_done = 0;
  84                 TRACE("add request\n");
  85                 rc = sclp_add_request(req);
  86                 if (rc) {
  87                         /* not initiated, wait some time and retry */
  88                         set_current_state(TASK_INTERRUPTIBLE);
  89                         TRACE("add request failed: rc = %i\n",rc);
  90                         schedule_timeout(SDIAS_SLEEP_TICKS);
  91                         continue;
  92                 }
  93                 /* initiated, wait for completion of service call */
  94                 wait_event(sdias_wq, (sclp_req_done == 1));
  95                 if (req->status == SCLP_REQ_FAILED) {
  96                         TRACE("sclp request failed\n");
  97                         rc = -EIO;
  98                         continue;
  99                 }
 100                 TRACE("request done\n");
 101                 break;
 102         }
 103         return rc;
 104 }
 105
 106 /*
 107  * Get number of blocks (4K) available in the HSA
 108  */
 109 int sclp_sdias_blk_count(void)
 110 {
 111         struct sclp_req request;
 112         int rc;
 113
 114         mutex_lock(&sdias_mutex);
 115
 116         memset(&sccb, 0, sizeof(sccb));
 117         memset(&request, 0, sizeof(request));
 118
 119         sccb.hdr.length = sizeof(sccb);
 120         sccb.evbuf.hdr.length = sizeof(struct sdias_evbuf);
 121         sccb.evbuf.hdr.type = EVTYP_SDIAS;
 122         sccb.evbuf.event_qual = EQ_SIZE;
 123         sccb.evbuf.data_id = DI_FCP_DUMP;
 124         sccb.evbuf.event_id = 4712;
 125         sccb.evbuf.dbs = 1;
 126
 127         request.sccb = &sccb;
 128         request.command = SCLP_CMDW_WRITE_EVENT_DATA;
 129         request.status = SCLP_REQ_FILLED;
 130         request.callback = sdias_callback;
 131
 132         rc = sdias_sclp_send(&request);
 133         if (rc) {
 134                 ERROR_MSG("sclp_send failed for get_nr_blocks\n");
 135                 goto out;
 136         }
 137         if (sccb.hdr.response_code != 0x0020) {
 138                 TRACE("send failed: %x\n", sccb.hdr.response_code);
 139                 rc = -EIO;
 140                 goto out;
 141         }
 142
 143         switch (sccb.evbuf.event_status) {
 144                 case 0:
 145                         rc = sccb.evbuf.blk_cnt;
 146                         break;
 147                 default:
 148                         ERROR_MSG("SCLP error: %x\n", sccb.evbuf.event_status);
 149                         rc = -EIO;
 150                         goto out;
 151         }
 152         TRACE("%i blocks\n", rc);
 153 out:
 154         mutex_unlock(&sdias_mutex);
 155         return rc;
 156 }
 157
 158 /*
 159  * Copy from HSA to absolute storage (not reentrant):
 160  *
 161  * @dest     : Address of buffer where data should be copied
 162  * @start_blk: Start Block (beginning with 1)
 163  * @nr_blks  : Number of 4K blocks to copy
 164  *
 165  * Return Value: 0 : Requested 'number' of blocks of data copied
 166  *               <0: ERROR - negative event status
 167  */
 168 int sclp_sdias_copy(void *dest, int start_blk, int nr_blks)
 169 {
 170         struct sclp_req request;
 171         int rc;
 172
 173         mutex_lock(&sdias_mutex);
 174
 175         memset(&sccb, 0, sizeof(sccb));
 176         memset(&request, 0, sizeof(request));
 177
 178         sccb.hdr.length = sizeof(sccb);
 179         sccb.evbuf.hdr.length = sizeof(struct sdias_evbuf);
 180         sccb.evbuf.hdr.type = EVTYP_SDIAS;
 181         sccb.evbuf.hdr.flags = 0;
 182         sccb.evbuf.event_qual = EQ_STORE_DATA;
 183         sccb.evbuf.data_id = DI_FCP_DUMP;
 184         sccb.evbuf.event_id = 4712;
 185 #ifdef __s390x__
 186         sccb.evbuf.asa_size = ASA_SIZE_64;
 187 #else
 188         sccb.evbuf.asa_size = ASA_SIZE_32;
 189 #endif
 190         sccb.evbuf.event_status = 0;
 191         sccb.evbuf.blk_cnt = nr_blks;
 192         sccb.evbuf.asa = (unsigned long)dest;
 193         sccb.evbuf.fbn = start_blk;
 194         sccb.evbuf.lbn = 0;
 195         sccb.evbuf.dbs = 1;
 196
 197         request.sccb     = &sccb;
 198         request.command  = SCLP_CMDW_WRITE_EVENT_DATA;
 199         request.status   = SCLP_REQ_FILLED;
 200         request.callback = sdias_callback;
 201
 202         rc = sdias_sclp_send(&request);
 203         if (rc) {
 204                 ERROR_MSG("sclp_send failed: %x\n", rc);
 205                 goto out;
 206         }
 207         if (sccb.hdr.response_code != 0x0020) {
 208                 TRACE("copy failed: %x\n", sccb.hdr.response_code);
 209                 rc = -EIO;
 210                 goto out;
 211         }
 212
 213         switch (sccb.evbuf.event_status) {
 214                 case EVSTATE_ALL_STORED:
 215                         TRACE("all stored\n");
 216                 case EVSTATE_PART_STORED:
 217                         TRACE("part stored: %i\n", sccb.evbuf.blk_cnt);
 218                         break;
 219                 case EVSTATE_NO_DATA:
 220                         TRACE("no data\n");
 221                 default:
 222                         ERROR_MSG("Error from SCLP while copying hsa. "
 223                                   "Event status = %x\n",
 224                                 sccb.evbuf.event_status);
 225                         rc = -EIO;
 226         }
 227 out:
 228         mutex_unlock(&sdias_mutex);
 229         return rc;
 230 }
 231
 232 int __init sclp_sdias_init(void)
 233 {
 234         int rc;
 235
 236         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 237                 return 0;
 238         sdias_dbf = debug_register("dump_sdias", 4, 1, 4 * sizeof(long));
 239         debug_register_view(sdias_dbf, &debug_sprintf_view);
 240         debug_set_level(sdias_dbf, 6);
 241         rc = sclp_register(&sclp_sdias_register);
 242         if (rc) {
 243                 ERROR_MSG("sclp register failed\n");
 244                 return rc;
 245         }
 246         init_waitqueue_head(&sdias_wq);
 247         TRACE("init done\n");
 248         return 0;
 249 }
 250
 251 void __exit sclp_sdias_exit(void)
 252 {
 253         debug_unregister(sdias_dbf);
 254         sclp_unregister(&sclp_sdias_register);
 255 }