drivers/scsi/pluto.c

   1 /* pluto.c: SparcSTORAGE Array SCSI host adapter driver.
   2  *
   3  * Copyright (C) 1997,1998,1999 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   4  *
   5  */
   6
   7 #include <linux/completion.h>
   8 #include <linux/kernel.h>
   9 #include <linux/delay.h>
  10 #include <linux/types.h>
  11 #include <linux/string.h>
  12 #include <linux/slab.h>
  13 #include <linux/blkdev.h>
  14 #include <linux/proc_fs.h>
  15 #include <linux/stat.h>
  16 #include <linux/init.h>
  17 #ifdef CONFIG_KMOD
  18 #include <linux/kmod.h>
  19 #endif
  20
  21 #include <asm/irq.h>
  22
  23 #include "scsi.h"
  24 #include <scsi/scsi_host.h>
  25 #include "../fc4/fcp_impl.h"
  26 #include "pluto.h"
  27
  28 #include <linux/module.h>
  29
  30 #define RQ_SCSI_BUSY            0xffff
  31 #define RQ_SCSI_DONE            0xfffe
  32
  33 /* #define PLUTO_DEBUG */
  34
  35 #define pluto_printk printk ("PLUTO %s: ", fc->name); printk
  36
  37 #ifdef PLUTO_DEBUG
  38 #define PLD(x)  pluto_printk x;
  39 #define PLND(x) printk ("PLUTO: "); printk x;
  40 #else
  41 #define PLD(x)
  42 #define PLND(x)
  43 #endif
  44
  45 static struct ctrl_inquiry {
  46         struct Scsi_Host host;
  47         struct pluto pluto;
  48         Scsi_Cmnd cmd;
  49         char inquiry[256];
  50         fc_channel *fc;
  51 } *fcs __initdata;
  52 static int fcscount __initdata = 0;
  53 static atomic_t fcss __initdata = ATOMIC_INIT(0);
  54 static DECLARE_COMPLETION(fc_detect_complete);
  55
  56 static int pluto_encode_addr(Scsi_Cmnd *SCpnt, u16 *addr, fc_channel *fc, fcp_cmnd *fcmd);
  57
  58 static void __init pluto_detect_done(Scsi_Cmnd *SCpnt)
  59 {
  60         /* Do nothing */
  61 }
  62
  63 static void __init pluto_detect_scsi_done(Scsi_Cmnd *SCpnt)
  64 {
  65         PLND(("Detect done %08lx\n", (long)SCpnt))
  66         if (atomic_dec_and_test (&fcss))
  67                 complete(&fc_detect_complete);
  68 }
  69
  70 int pluto_slave_configure(struct scsi_device *device)
  71 {
  72         int depth_to_use;
  73
  74         if (device->tagged_supported)
  75                 depth_to_use = /* 254 */ 8;
  76         else
  77                 depth_to_use = 2;
  78
  79         scsi_adjust_queue_depth(device,
  80                                 (device->tagged_supported ?
  81                                  MSG_SIMPLE_TAG : 0),
  82                                 depth_to_use);
  83
  84         return 0;
  85 }
  86
  87 /* Detect all SSAs attached to the machine.
  88    To be fast, do it on all online FC channels at the same time. */
  89 int __init pluto_detect(struct scsi_host_template *tpnt)
  90 {
  91         int i, retry, nplutos;
  92         fc_channel *fc;
  93         struct scsi_device dev;
  94
  95         tpnt->proc_name = "pluto";
  96         fcscount = 0;
  97         for_each_online_fc_channel(fc) {
  98                 if (!fc->posmap)
  99                         fcscount++;
 100         }
 101         PLND(("%d channels online\n", fcscount))
 102         if (!fcscount) {
 103 #if defined(MODULE) && defined(CONFIG_FC4_SOC_MODULE) && defined(CONFIG_KMOD)
 104                 request_module("soc");
 105
 106                 for_each_online_fc_channel(fc) {
 107                         if (!fc->posmap)
 108                                 fcscount++;
 109                 }
 110                 if (!fcscount)
 111 #endif
 112                         return 0;
 113         }
 114         fcs = kcalloc(fcscount, sizeof (struct ctrl_inquiry), GFP_DMA);
 115         if (!fcs) {
 116                 printk ("PLUTO: Not enough memory to probe\n");
 117                 return 0;
 118         }
 119
 120         memset (&dev, 0, sizeof(dev));
 121         atomic_set (&fcss, fcscount);
 122
 123         i = 0;
 124         for_each_online_fc_channel(fc) {
 125                 Scsi_Cmnd *SCpnt;
 126                 struct Scsi_Host *host;
 127                 struct pluto *pluto;
 128
 129                 if (i == fcscount) break;
 130                 if (fc->posmap) continue;
 131
 132                 PLD(("trying to find SSA\n"))
 133
 134                 /* If this is already registered to some other SCSI host, then it cannot be pluto */
 135                 if (fc->scsi_name[0]) continue;
 136                 memcpy (fc->scsi_name, "SSA", 4);
 137
 138                 fcs[i].fc = fc;
 139
 140                 fc->can_queue = PLUTO_CAN_QUEUE;
 141                 fc->rsp_size = 64;
 142                 fc->encode_addr = pluto_encode_addr;
 143
 144                 fc->fcp_register(fc, TYPE_SCSI_FCP, 0);
 145
 146                 SCpnt = &(fcs[i].cmd);
 147                 host = &(fcs[i].host);
 148                 pluto = (struct pluto *)host->hostdata;
 149
 150                 pluto->fc = fc;
 151
 152                 SCpnt->cmnd[0] = INQUIRY;
 153                 SCpnt->cmnd[4] = 255;
 154
 155                 /* FC layer requires this, so that SCpnt->device->tagged_supported is initially 0 */
 156                 SCpnt->device = &dev;
 157                 dev.host = host;
 158
 159                 SCpnt->cmd_len = COMMAND_SIZE(INQUIRY);
 160
 161                 SCpnt->request->cmd_flags &= ~REQ_STARTED;
 162
 163                 SCpnt->request_bufflen = 256;
 164                 SCpnt->request_buffer = fcs[i].inquiry;
 165                 PLD(("set up %d %08lx\n", i, (long)SCpnt))
 166                 i++;
 167         }
 168
 169         for (retry = 0; retry < 5; retry++) {
 170                 for (i = 0; i < fcscount; i++) {
 171                         if (!fcs[i].fc) break;
 172                         if (!(fcs[i].cmd.request->cmd_flags & REQ_STARTED)) {
 173                                 fcs[i].cmd.request->cmd_flags |= REQ_STARTED;
 174                                 disable_irq(fcs[i].fc->irq);
 175                                 PLND(("queuecommand %d %d\n", retry, i))
 176                                 fcp_scsi_queuecommand (&(fcs[i].cmd),
 177                                         pluto_detect_scsi_done);
 178                                 enable_irq(fcs[i].fc->irq);
 179                         }
 180                 }
 181
 182                 wait_for_completion_timeout(&fc_detect_complete, 10 * HZ);
 183                 PLND(("Woken up\n"))
 184                 if (!atomic_read(&fcss))
 185                         break; /* All fc channels have answered us */
 186         }
 187
 188         PLND(("Finished search\n"))
 189         for (i = 0, nplutos = 0; i < fcscount; i++) {
 190                 Scsi_Cmnd *SCpnt;
 191
 192                 if (!(fc = fcs[i].fc)) break;
 193
 194                 SCpnt = &(fcs[i].cmd);
 195
 196                 /* Let FC mid-level free allocated resources */
 197                 pluto_detect_scsi_done(SCpnt);
 198
 199                 if (!SCpnt->result) {
 200                         struct pluto_inquiry *inq;
 201                         struct pluto *pluto;
 202                         struct Scsi_Host *host;
 203
 204                         inq = (struct pluto_inquiry *)fcs[i].inquiry;
 205
 206                         if ((inq->dtype & 0x1f) == TYPE_PROCESSOR &&
 207                             !strncmp (inq->vendor_id, "SUN", 3) &&
 208                             !strncmp (inq->product_id, "SSA", 3)) {
 209                                 char *p;
 210                                 long *ages;
 211
 212                                 ages = kcalloc((inq->channels + 1) * inq->targets, sizeof(long), GFP_KERNEL);
 213                                 if (!ages) continue;
 214
 215                                 host = scsi_register (tpnt, sizeof (struct pluto));
 216                                 if(!host)
 217                                 {
 218                                         kfree(ages);
 219                                         continue;
 220                                 }
 221
 222                                 if (!try_module_get(fc->module)) {
 223                                         kfree(ages);
 224                                         scsi_unregister(host);
 225                                         continue;
 226                                 }
 227
 228                                 nplutos++;
 229
 230                                 pluto = (struct pluto *)host->hostdata;
 231
 232                                 host->max_id = inq->targets;
 233                                 host->max_channel = inq->channels;
 234                                 host->irq = fc->irq;
 235
 236                                 fc->channels = inq->channels + 1;
 237                                 fc->targets = inq->targets;
 238                                 fc->ages = ages;
 239
 240                                 pluto->fc = fc;
 241                                 memcpy (pluto->rev_str, inq->revision, 4);
 242                                 pluto->rev_str[4] = 0;
 243                                 p = strchr (pluto->rev_str, ' ');
 244                                 if (p) *p = 0;
 245                                 memcpy (pluto->fw_rev_str, inq->fw_revision, 4);
 246                                 pluto->fw_rev_str[4] = 0;
 247                                 p = strchr (pluto->fw_rev_str, ' ');
 248                                 if (p) *p = 0;
 249                                 memcpy (pluto->serial_str, inq->serial, 12);
 250                                 pluto->serial_str[12] = 0;
 251                                 p = strchr (pluto->serial_str, ' ');
 252                                 if (p) *p = 0;
 253
 254                                 PLD(("Found SSA rev %s fw rev %s serial %s %dx%d\n", pluto->rev_str, pluto->fw_rev_str, pluto->serial_str, host->max_channel, host->max_id))
 255                         } else
 256                                 fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 257                 } else
 258                         fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 259         }
 260         kfree(fcs);
 261         if (nplutos)
 262                 printk ("PLUTO: Total of %d SparcSTORAGE Arrays found\n", nplutos);
 263         return nplutos;
 264 }
 265
 266 int pluto_release(struct Scsi_Host *host)
 267 {
 268         struct pluto *pluto = (struct pluto *)host->hostdata;
 269         fc_channel *fc = pluto->fc;
 270
 271         module_put(fc->module);
 272
 273         fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 274         PLND((" releasing pluto.\n"));
 275         kfree (fc->ages);
 276         PLND(("released pluto!\n"));
 277         return 0;
 278 }
 279
 280 const char *pluto_info(struct Scsi_Host *host)
 281 {
 282         static char buf[128], *p;
 283         struct pluto *pluto = (struct pluto *) host->hostdata;
 284
 285         sprintf(buf, "SUN SparcSTORAGE Array %s fw %s serial %s %dx%d on %s",
 286                 pluto->rev_str, pluto->fw_rev_str, pluto->serial_str,
 287                 host->max_channel, host->max_id, pluto->fc->name);
 288 #ifdef __sparc__
 289         p = strchr(buf, 0);
 290         sprintf(p, " PROM node %x", pluto->fc->dev->prom_node);
 291 #endif
 292         return buf;
 293 }
 294
 295 /* SSA uses this FC4S addressing:
 296    switch (addr[0])
 297    {
 298    case 0: CONTROLLER - All of addr[1]..addr[3] has to be 0
 299    case 1: SINGLE DISK - addr[1] channel, addr[2] id, addr[3] 0
 300    case 2: DISK GROUP - ???
 301    }
 302
 303    So that SCSI mid-layer can access to these, we reserve
 304    channel 0 id 0 lun 0 for CONTROLLER
 305    and channels 1 .. max_channel are normal single disks.
 306  */
 307 static int pluto_encode_addr(Scsi_Cmnd *SCpnt, u16 *addr, fc_channel *fc, fcp_cmnd *fcmd)
 308 {
 309         PLND(("encode addr %d %d %d\n", SCpnt->device->channel, SCpnt->device->id, SCpnt->cmnd[1] & 0xe0))
 310         /* We don't support LUNs - neither does SSA :) */
 311         if (SCpnt->cmnd[1] & 0xe0)
 312                 return -EINVAL;
 313         if (!SCpnt->device->channel) {
 314                 if (SCpnt->device->id)
 315                         return -EINVAL;
 316                 memset (addr, 0, 4 * sizeof(u16));
 317         } else {
 318                 addr[0] = 1;
 319                 addr[1] = SCpnt->device->channel - 1;
 320                 addr[2] = SCpnt->device->id;
 321                 addr[3] = 0;
 322         }
 323         /* We're Point-to-Point, so target it to the default DID */
 324         fcmd->did = fc->did;
 325         PLND(("trying %04x%04x%04x%04x\n", addr[0], addr[1], addr[2], addr[3]))
 326         return 0;
 327 }
 328
 329 static struct scsi_host_template driver_template = {
 330         .name                   = "Sparc Storage Array 100/200",
 331         .detect                 = pluto_detect,
 332         .release                = pluto_release,
 333         .info                   = pluto_info,
 334         .queuecommand           = fcp_scsi_queuecommand,
 335         .slave_configure        = pluto_slave_configure,
 336         .can_queue              = PLUTO_CAN_QUEUE,
 337         .this_id                = -1,
 338         .sg_tablesize           = 1,
 339         .cmd_per_lun            = 1,
 340         .use_clustering         = ENABLE_CLUSTERING,
 341         .eh_abort_handler       = fcp_scsi_abort,
 342         .eh_device_reset_handler = fcp_scsi_dev_reset,
 343         .eh_host_reset_handler  = fcp_scsi_host_reset,
 344 };
 345
 346 #include "scsi_module.c"
 347
 348 MODULE_LICENSE("GPL");
 349