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/kernel.h>
   8 #include <linux/delay.h>
   9 #include <linux/types.h>
  10 #include <linux/string.h>
  11 #include <linux/slab.h>
  12 #include <linux/blkdev.h>
  13 #include <linux/proc_fs.h>
  14 #include <linux/stat.h>
  15 #include <linux/init.h>
  16 #include <linux/config.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 PLUTO_DEBUG */
  31
  32 #define pluto_printk printk ("PLUTO %s: ", fc->name); printk
  33
  34 #ifdef PLUTO_DEBUG
  35 #define PLD(x)  pluto_printk x;
  36 #define PLND(x) printk ("PLUTO: "); printk x;
  37 #else
  38 #define PLD(x)
  39 #define PLND(x)
  40 #endif
  41
  42 static struct ctrl_inquiry {
  43         struct Scsi_Host host;
  44         struct pluto pluto;
  45         Scsi_Cmnd cmd;
  46         char inquiry[256];
  47         fc_channel *fc;
  48 } *fcs __initdata = { 0 };
  49 static int fcscount __initdata = 0;
  50 static atomic_t fcss __initdata = ATOMIC_INIT(0);
  51 DECLARE_MUTEX_LOCKED(fc_sem);
  52
  53 static int pluto_encode_addr(Scsi_Cmnd *SCpnt, u16 *addr, fc_channel *fc, fcp_cmnd *fcmd);
  54
  55 static void __init pluto_detect_timeout(unsigned long data)
  56 {
  57         PLND(("Timeout\n"))
  58         up(&fc_sem);
  59 }
  60
  61 static void __init pluto_detect_done(Scsi_Cmnd *SCpnt)
  62 {
  63         /* Do nothing */
  64 }
  65
  66 static void __init pluto_detect_scsi_done(Scsi_Cmnd *SCpnt)
  67 {
  68         SCpnt->request->rq_status = RQ_SCSI_DONE;
  69         PLND(("Detect done %08lx\n", (long)SCpnt))
  70         if (atomic_dec_and_test (&fcss))
  71                 up(&fc_sem);
  72 }
  73
  74 int pluto_slave_configure(Scsi_Device *device)
  75 {
  76         int depth_to_use;
  77
  78         if (device->tagged_supported)
  79                 depth_to_use = /* 254 */ 8;
  80         else
  81                 depth_to_use = 2;
  82
  83         scsi_adjust_queue_depth(device,
  84                                 (device->tagged_supported ?
  85                                  MSG_SIMPLE_TAG : 0),
  86                                 depth_to_use);
  87
  88         return 0;
  89 }
  90
  91 /* Detect all SSAs attached to the machine.
  92    To be fast, do it on all online FC channels at the same time. */
  93 int __init pluto_detect(Scsi_Host_Template *tpnt)
  94 {
  95         int i, retry, nplutos;
  96         fc_channel *fc;
  97         Scsi_Device dev;
  98         struct timer_list fc_timer =
  99                 TIMER_INITIALIZER(pluto_detect_timeout, 0, 0);
 100
 101         tpnt->proc_name = "pluto";
 102         fcscount = 0;
 103         for_each_online_fc_channel(fc) {
 104                 if (!fc->posmap)
 105                         fcscount++;
 106         }
 107         PLND(("%d channels online\n", fcscount))
 108         if (!fcscount) {
 109 #if defined(MODULE) && defined(CONFIG_FC4_SOC_MODULE) && defined(CONFIG_KMOD)
 110                 request_module("soc");
 111
 112                 for_each_online_fc_channel(fc) {
 113                         if (!fc->posmap)
 114                                 fcscount++;
 115                 }
 116                 if (!fcscount)
 117 #endif
 118                         return 0;
 119         }
 120         fcs = (struct ctrl_inquiry *) kmalloc (sizeof (struct ctrl_inquiry) * fcscount, GFP_DMA);
 121         if (!fcs) {
 122                 printk ("PLUTO: Not enough memory to probe\n");
 123                 return 0;
 124         }
 125
 126         memset (fcs, 0, sizeof (struct ctrl_inquiry) * fcscount);
 127         memset (&dev, 0, sizeof(dev));
 128         atomic_set (&fcss, fcscount);
 129
 130         i = 0;
 131         for_each_online_fc_channel(fc) {
 132                 Scsi_Cmnd *SCpnt;
 133                 struct Scsi_Host *host;
 134                 struct pluto *pluto;
 135
 136                 if (i == fcscount) break;
 137                 if (fc->posmap) continue;
 138
 139                 PLD(("trying to find SSA\n"))
 140
 141                 /* If this is already registered to some other SCSI host, then it cannot be pluto */
 142                 if (fc->scsi_name[0]) continue;
 143                 memcpy (fc->scsi_name, "SSA", 4);
 144
 145                 fcs[i].fc = fc;
 146
 147                 fc->can_queue = PLUTO_CAN_QUEUE;
 148                 fc->rsp_size = 64;
 149                 fc->encode_addr = pluto_encode_addr;
 150
 151                 fc->fcp_register(fc, TYPE_SCSI_FCP, 0);
 152
 153                 SCpnt = &(fcs[i].cmd);
 154                 host = &(fcs[i].host);
 155                 pluto = (struct pluto *)host->hostdata;
 156
 157                 pluto->fc = fc;
 158
 159                 SCpnt->cmnd[0] = INQUIRY;
 160                 SCpnt->cmnd[4] = 255;
 161
 162                 /* FC layer requires this, so that SCpnt->device->tagged_supported is initially 0 */
 163                 SCpnt->device = &dev;
 164                 dev.host = host;
 165
 166                 SCpnt->cmd_len = COMMAND_SIZE(INQUIRY);
 167
 168                 SCpnt->request->rq_status = RQ_SCSI_BUSY;
 169
 170                 SCpnt->done = pluto_detect_done;
 171                 SCpnt->bufflen = 256;
 172                 SCpnt->buffer = fcs[i].inquiry;
 173                 SCpnt->request_bufflen = 256;
 174                 SCpnt->request_buffer = fcs[i].inquiry;
 175                 PLD(("set up %d %08lx\n", i, (long)SCpnt))
 176                 i++;
 177         }
 178
 179         for (retry = 0; retry < 5; retry++) {
 180                 for (i = 0; i < fcscount; i++) {
 181                         if (!fcs[i].fc) break;
 182                         if (fcs[i].cmd.request->rq_status != RQ_SCSI_DONE) {
 183                                 disable_irq(fcs[i].fc->irq);
 184                                 PLND(("queuecommand %d %d\n", retry, i))
 185                                 fcp_scsi_queuecommand (&(fcs[i].cmd),
 186                                         pluto_detect_scsi_done);
 187                                 enable_irq(fcs[i].fc->irq);
 188                         }
 189                 }
 190
 191                 fc_timer.expires = jiffies + 10 * HZ;
 192                 add_timer(&fc_timer);
 193
 194                 down(&fc_sem);
 195                 PLND(("Woken up\n"))
 196                 if (!atomic_read(&fcss))
 197                         break; /* All fc channels have answered us */
 198         }
 199         del_timer_sync(&fc_timer);
 200
 201         PLND(("Finished search\n"))
 202         for (i = 0, nplutos = 0; i < fcscount; i++) {
 203                 Scsi_Cmnd *SCpnt;
 204
 205                 if (!(fc = fcs[i].fc)) break;
 206
 207                 SCpnt = &(fcs[i].cmd);
 208
 209                 /* Let FC mid-level free allocated resources */
 210                 SCpnt->done (SCpnt);
 211
 212                 if (!SCpnt->result) {
 213                         struct pluto_inquiry *inq;
 214                         struct pluto *pluto;
 215                         struct Scsi_Host *host;
 216
 217                         inq = (struct pluto_inquiry *)fcs[i].inquiry;
 218
 219                         if ((inq->dtype & 0x1f) == TYPE_PROCESSOR &&
 220                             !strncmp (inq->vendor_id, "SUN", 3) &&
 221                             !strncmp (inq->product_id, "SSA", 3)) {
 222                                 char *p;
 223                                 long *ages;
 224
 225                                 ages = kmalloc (((inq->channels + 1) * inq->targets) * sizeof(long), GFP_KERNEL);
 226                                 if (!ages) continue;
 227
 228                                 host = scsi_register (tpnt, sizeof (struct pluto));
 229                                 if(!host)
 230                                 {
 231                                         kfree(ages);
 232                                         continue;
 233                                 }
 234
 235                                 if (!try_module_get(fc->module)) {
 236                                         kfree(ages);
 237                                         scsi_unregister(host);
 238                                         continue;
 239                                 }
 240
 241                                 nplutos++;
 242
 243                                 pluto = (struct pluto *)host->hostdata;
 244
 245                                 host->max_id = inq->targets;
 246                                 host->max_channel = inq->channels;
 247                                 host->irq = fc->irq;
 248
 249                                 fc->channels = inq->channels + 1;
 250                                 fc->targets = inq->targets;
 251                                 fc->ages = ages;
 252                                 memset (ages, 0, ((inq->channels + 1) * inq->targets) * sizeof(long));
 253
 254                                 pluto->fc = fc;
 255                                 memcpy (pluto->rev_str, inq->revision, 4);
 256                                 pluto->rev_str[4] = 0;
 257                                 p = strchr (pluto->rev_str, ' ');
 258                                 if (p) *p = 0;
 259                                 memcpy (pluto->fw_rev_str, inq->fw_revision, 4);
 260                                 pluto->fw_rev_str[4] = 0;
 261                                 p = strchr (pluto->fw_rev_str, ' ');
 262                                 if (p) *p = 0;
 263                                 memcpy (pluto->serial_str, inq->serial, 12);
 264                                 pluto->serial_str[12] = 0;
 265                                 p = strchr (pluto->serial_str, ' ');
 266                                 if (p) *p = 0;
 267
 268                                 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))
 269                         } else
 270                                 fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 271                 } else
 272                         fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 273         }
 274         kfree((char *)fcs);
 275         if (nplutos)
 276                 printk ("PLUTO: Total of %d SparcSTORAGE Arrays found\n", nplutos);
 277         return nplutos;
 278 }
 279
 280 int pluto_release(struct Scsi_Host *host)
 281 {
 282         struct pluto *pluto = (struct pluto *)host->hostdata;
 283         fc_channel *fc = pluto->fc;
 284
 285         module_put(fc->module);
 286
 287         fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 288         PLND((" releasing pluto.\n"));
 289         kfree (fc->ages);
 290         PLND(("released pluto!\n"));
 291         return 0;
 292 }
 293
 294 const char *pluto_info(struct Scsi_Host *host)
 295 {
 296         static char buf[128], *p;
 297         struct pluto *pluto = (struct pluto *) host->hostdata;
 298
 299         sprintf(buf, "SUN SparcSTORAGE Array %s fw %s serial %s %dx%d on %s",
 300                 pluto->rev_str, pluto->fw_rev_str, pluto->serial_str,
 301                 host->max_channel, host->max_id, pluto->fc->name);
 302 #ifdef __sparc__
 303         p = strchr(buf, 0);
 304         sprintf(p, " PROM node %x", pluto->fc->dev->prom_node);
 305 #endif
 306         return buf;
 307 }
 308
 309 /* SSA uses this FC4S addressing:
 310    switch (addr[0])
 311    {
 312    case 0: CONTROLLER - All of addr[1]..addr[3] has to be 0
 313    case 1: SINGLE DISK - addr[1] channel, addr[2] id, addr[3] 0
 314    case 2: DISK GROUP - ???
 315    }
 316
 317    So that SCSI mid-layer can access to these, we reserve
 318    channel 0 id 0 lun 0 for CONTROLLER
 319    and channels 1 .. max_channel are normal single disks.
 320  */
 321 static int pluto_encode_addr(Scsi_Cmnd *SCpnt, u16 *addr, fc_channel *fc, fcp_cmnd *fcmd)
 322 {
 323         PLND(("encode addr %d %d %d\n", SCpnt->device->channel, SCpnt->device->id, SCpnt->cmnd[1] & 0xe0))
 324         /* We don't support LUNs - neither does SSA :) */
 325         if (SCpnt->cmnd[1] & 0xe0)
 326                 return -EINVAL;
 327         if (!SCpnt->device->channel) {
 328                 if (SCpnt->device->id)
 329                         return -EINVAL;
 330                 memset (addr, 0, 4 * sizeof(u16));
 331         } else {
 332                 addr[0] = 1;
 333                 addr[1] = SCpnt->device->channel - 1;
 334                 addr[2] = SCpnt->device->id;
 335                 addr[3] = 0;
 336         }
 337         /* We're Point-to-Point, so target it to the default DID */
 338         fcmd->did = fc->did;
 339         PLND(("trying %04x%04x%04x%04x\n", addr[0], addr[1], addr[2], addr[3]))
 340         return 0;
 341 }
 342
 343 static Scsi_Host_Template driver_template = {
 344         .name                   = "Sparc Storage Array 100/200",
 345         .detect                 = pluto_detect,
 346         .release                = pluto_release,
 347         .info                   = pluto_info,
 348         .queuecommand           = fcp_scsi_queuecommand,
 349         .slave_configure        = pluto_slave_configure,
 350         .can_queue              = PLUTO_CAN_QUEUE,
 351         .this_id                = -1,
 352         .sg_tablesize           = 1,
 353         .cmd_per_lun            = 1,
 354         .use_clustering         = ENABLE_CLUSTERING,
 355         .eh_abort_handler       = fcp_scsi_abort,
 356         .eh_device_reset_handler = fcp_scsi_dev_reset,
 357         .eh_bus_reset_handler   = fcp_scsi_bus_reset,
 358         .eh_host_reset_handler  = fcp_scsi_host_reset,
 359 };
 360
 361 #include "scsi_module.c"
 362
 363 MODULE_LICENSE("GPL");
 364