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 #ifdef CONFIG_KMOD
  17 #include <linux/kmod.h>
  18 #endif
  19
  20 #include <asm/irq.h>
  21
  22 #include "scsi.h"
  23 #include <scsi/scsi_host.h>
  24 #include "../fc4/fcp_impl.h"
  25 #include "pluto.h"
  26
  27 #include <linux/module.h>
  28
  29 #define RQ_SCSI_BUSY            0xffff
  30 #define RQ_SCSI_DONE            0xfffe
  31
  32 /* #define PLUTO_DEBUG */
  33
  34 #define pluto_printk printk ("PLUTO %s: ", fc->name); printk
  35
  36 #ifdef PLUTO_DEBUG
  37 #define PLD(x)  pluto_printk x;
  38 #define PLND(x) printk ("PLUTO: "); printk x;
  39 #else
  40 #define PLD(x)
  41 #define PLND(x)
  42 #endif
  43
  44 static struct ctrl_inquiry {
  45         struct Scsi_Host host;
  46         struct pluto pluto;
  47         Scsi_Cmnd cmd;
  48         char inquiry[256];
  49         fc_channel *fc;
  50 } *fcs __initdata;
  51 static int fcscount __initdata = 0;
  52 static atomic_t fcss __initdata = ATOMIC_INIT(0);
  53 DECLARE_MUTEX_LOCKED(fc_sem);
  54
  55 static int pluto_encode_addr(Scsi_Cmnd *SCpnt, u16 *addr, fc_channel *fc, fcp_cmnd *fcmd);
  56
  57 static void __init pluto_detect_timeout(unsigned long data)
  58 {
  59         PLND(("Timeout\n"))
  60         up(&fc_sem);
  61 }
  62
  63 static void __init pluto_detect_done(Scsi_Cmnd *SCpnt)
  64 {
  65         /* Do nothing */
  66 }
  67
  68 static void __init pluto_detect_scsi_done(Scsi_Cmnd *SCpnt)
  69 {
  70         SCpnt->request->rq_status = RQ_SCSI_DONE;
  71         PLND(("Detect done %08lx\n", (long)SCpnt))
  72         if (atomic_dec_and_test (&fcss))
  73                 up(&fc_sem);
  74 }
  75
  76 int pluto_slave_configure(struct scsi_device *device)
  77 {
  78         int depth_to_use;
  79
  80         if (device->tagged_supported)
  81                 depth_to_use = /* 254 */ 8;
  82         else
  83                 depth_to_use = 2;
  84
  85         scsi_adjust_queue_depth(device,
  86                                 (device->tagged_supported ?
  87                                  MSG_SIMPLE_TAG : 0),
  88                                 depth_to_use);
  89
  90         return 0;
  91 }
  92
  93 /* Detect all SSAs attached to the machine.
  94    To be fast, do it on all online FC channels at the same time. */
  95 int __init pluto_detect(struct scsi_host_template *tpnt)
  96 {
  97         int i, retry, nplutos;
  98         fc_channel *fc;
  99         struct scsi_device dev;
 100         DEFINE_TIMER(fc_timer, pluto_detect_timeout, 0, 0);
 101
 102         tpnt->proc_name = "pluto";
 103         fcscount = 0;
 104         for_each_online_fc_channel(fc) {
 105                 if (!fc->posmap)
 106                         fcscount++;
 107         }
 108         PLND(("%d channels online\n", fcscount))
 109         if (!fcscount) {
 110 #if defined(MODULE) && defined(CONFIG_FC4_SOC_MODULE) && defined(CONFIG_KMOD)
 111                 request_module("soc");
 112
 113                 for_each_online_fc_channel(fc) {
 114                         if (!fc->posmap)
 115                                 fcscount++;
 116                 }
 117                 if (!fcscount)
 118 #endif
 119                         return 0;
 120         }
 121         fcs = (struct ctrl_inquiry *) kmalloc (sizeof (struct ctrl_inquiry) * fcscount, GFP_DMA);
 122         if (!fcs) {
 123                 printk ("PLUTO: Not enough memory to probe\n");
 124                 return 0;
 125         }
 126
 127         memset (fcs, 0, sizeof (struct ctrl_inquiry) * fcscount);
 128         memset (&dev, 0, sizeof(dev));
 129         atomic_set (&fcss, fcscount);
 130
 131         i = 0;
 132         for_each_online_fc_channel(fc) {
 133                 Scsi_Cmnd *SCpnt;
 134                 struct Scsi_Host *host;
 135                 struct pluto *pluto;
 136
 137                 if (i == fcscount) break;
 138                 if (fc->posmap) continue;
 139
 140                 PLD(("trying to find SSA\n"))
 141
 142                 /* If this is already registered to some other SCSI host, then it cannot be pluto */
 143                 if (fc->scsi_name[0]) continue;
 144                 memcpy (fc->scsi_name, "SSA", 4);
 145
 146                 fcs[i].fc = fc;
 147
 148                 fc->can_queue = PLUTO_CAN_QUEUE;
 149                 fc->rsp_size = 64;
 150                 fc->encode_addr = pluto_encode_addr;
 151
 152                 fc->fcp_register(fc, TYPE_SCSI_FCP, 0);
 153
 154                 SCpnt = &(fcs[i].cmd);
 155                 host = &(fcs[i].host);
 156                 pluto = (struct pluto *)host->hostdata;
 157
 158                 pluto->fc = fc;
 159
 160                 SCpnt->cmnd[0] = INQUIRY;
 161                 SCpnt->cmnd[4] = 255;
 162
 163                 /* FC layer requires this, so that SCpnt->device->tagged_supported is initially 0 */
 164                 SCpnt->device = &dev;
 165                 dev.host = host;
 166
 167                 SCpnt->cmd_len = COMMAND_SIZE(INQUIRY);
 168
 169                 SCpnt->request->rq_status = RQ_SCSI_BUSY;
 170
 171                 SCpnt->done = pluto_detect_done;
 172                 SCpnt->bufflen = 256;
 173                 SCpnt->buffer = fcs[i].inquiry;
 174                 SCpnt->request_bufflen = 256;
 175                 SCpnt->request_buffer = fcs[i].inquiry;
 176                 PLD(("set up %d %08lx\n", i, (long)SCpnt))
 177                 i++;
 178         }
 179
 180         for (retry = 0; retry < 5; retry++) {
 181                 for (i = 0; i < fcscount; i++) {
 182                         if (!fcs[i].fc) break;
 183                         if (fcs[i].cmd.request->rq_status != RQ_SCSI_DONE) {
 184                                 disable_irq(fcs[i].fc->irq);
 185                                 PLND(("queuecommand %d %d\n", retry, i))
 186                                 fcp_scsi_queuecommand (&(fcs[i].cmd),
 187                                         pluto_detect_scsi_done);
 188                                 enable_irq(fcs[i].fc->irq);
 189                         }
 190                 }
 191
 192                 fc_timer.expires = jiffies + 10 * HZ;
 193                 add_timer(&fc_timer);
 194
 195                 down(&fc_sem);
 196                 PLND(("Woken up\n"))
 197                 if (!atomic_read(&fcss))
 198                         break; /* All fc channels have answered us */
 199         }
 200         del_timer_sync(&fc_timer);
 201
 202         PLND(("Finished search\n"))
 203         for (i = 0, nplutos = 0; i < fcscount; i++) {
 204                 Scsi_Cmnd *SCpnt;
 205
 206                 if (!(fc = fcs[i].fc)) break;
 207
 208                 SCpnt = &(fcs[i].cmd);
 209
 210                 /* Let FC mid-level free allocated resources */
 211                 SCpnt->done (SCpnt);
 212
 213                 if (!SCpnt->result) {
 214                         struct pluto_inquiry *inq;
 215                         struct pluto *pluto;
 216                         struct Scsi_Host *host;
 217
 218                         inq = (struct pluto_inquiry *)fcs[i].inquiry;
 219
 220                         if ((inq->dtype & 0x1f) == TYPE_PROCESSOR &&
 221                             !strncmp (inq->vendor_id, "SUN", 3) &&
 222                             !strncmp (inq->product_id, "SSA", 3)) {
 223                                 char *p;
 224                                 long *ages;
 225
 226                                 ages = kmalloc (((inq->channels + 1) * inq->targets) * sizeof(long), GFP_KERNEL);
 227                                 if (!ages) continue;
 228
 229                                 host = scsi_register (tpnt, sizeof (struct pluto));
 230                                 if(!host)
 231                                 {
 232                                         kfree(ages);
 233                                         continue;
 234                                 }
 235
 236                                 if (!try_module_get(fc->module)) {
 237                                         kfree(ages);
 238                                         scsi_unregister(host);
 239                                         continue;
 240                                 }
 241
 242                                 nplutos++;
 243
 244                                 pluto = (struct pluto *)host->hostdata;
 245
 246                                 host->max_id = inq->targets;
 247                                 host->max_channel = inq->channels;
 248                                 host->irq = fc->irq;
 249
 250                                 fc->channels = inq->channels + 1;
 251                                 fc->targets = inq->targets;
 252                                 fc->ages = ages;
 253                                 memset (ages, 0, ((inq->channels + 1) * inq->targets) * sizeof(long));
 254
 255                                 pluto->fc = fc;
 256                                 memcpy (pluto->rev_str, inq->revision, 4);
 257                                 pluto->rev_str[4] = 0;
 258                                 p = strchr (pluto->rev_str, ' ');
 259                                 if (p) *p = 0;
 260                                 memcpy (pluto->fw_rev_str, inq->fw_revision, 4);
 261                                 pluto->fw_rev_str[4] = 0;
 262                                 p = strchr (pluto->fw_rev_str, ' ');
 263                                 if (p) *p = 0;
 264                                 memcpy (pluto->serial_str, inq->serial, 12);
 265                                 pluto->serial_str[12] = 0;
 266                                 p = strchr (pluto->serial_str, ' ');
 267                                 if (p) *p = 0;
 268
 269                                 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))
 270                         } else
 271                                 fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 272                 } else
 273                         fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 274         }
 275         kfree((char *)fcs);
 276         if (nplutos)
 277                 printk ("PLUTO: Total of %d SparcSTORAGE Arrays found\n", nplutos);
 278         return nplutos;
 279 }
 280
 281 int pluto_release(struct Scsi_Host *host)
 282 {
 283         struct pluto *pluto = (struct pluto *)host->hostdata;
 284         fc_channel *fc = pluto->fc;
 285
 286         module_put(fc->module);
 287
 288         fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 289         PLND((" releasing pluto.\n"));
 290         kfree (fc->ages);
 291         PLND(("released pluto!\n"));
 292         return 0;
 293 }
 294
 295 const char *pluto_info(struct Scsi_Host *host)
 296 {
 297         static char buf[128], *p;
 298         struct pluto *pluto = (struct pluto *) host->hostdata;
 299
 300         sprintf(buf, "SUN SparcSTORAGE Array %s fw %s serial %s %dx%d on %s",
 301                 pluto->rev_str, pluto->fw_rev_str, pluto->serial_str,
 302                 host->max_channel, host->max_id, pluto->fc->name);
 303 #ifdef __sparc__
 304         p = strchr(buf, 0);
 305         sprintf(p, " PROM node %x", pluto->fc->dev->prom_node);
 306 #endif
 307         return buf;
 308 }
 309
 310 /* SSA uses this FC4S addressing:
 311    switch (addr[0])
 312    {
 313    case 0: CONTROLLER - All of addr[1]..addr[3] has to be 0
 314    case 1: SINGLE DISK - addr[1] channel, addr[2] id, addr[3] 0
 315    case 2: DISK GROUP - ???
 316    }
 317
 318    So that SCSI mid-layer can access to these, we reserve
 319    channel 0 id 0 lun 0 for CONTROLLER
 320    and channels 1 .. max_channel are normal single disks.
 321  */
 322 static int pluto_encode_addr(Scsi_Cmnd *SCpnt, u16 *addr, fc_channel *fc, fcp_cmnd *fcmd)
 323 {
 324         PLND(("encode addr %d %d %d\n", SCpnt->device->channel, SCpnt->device->id, SCpnt->cmnd[1] & 0xe0))
 325         /* We don't support LUNs - neither does SSA :) */
 326         if (SCpnt->cmnd[1] & 0xe0)
 327                 return -EINVAL;
 328         if (!SCpnt->device->channel) {
 329                 if (SCpnt->device->id)
 330                         return -EINVAL;
 331                 memset (addr, 0, 4 * sizeof(u16));
 332         } else {
 333                 addr[0] = 1;
 334                 addr[1] = SCpnt->device->channel - 1;
 335                 addr[2] = SCpnt->device->id;
 336                 addr[3] = 0;
 337         }
 338         /* We're Point-to-Point, so target it to the default DID */
 339         fcmd->did = fc->did;
 340         PLND(("trying %04x%04x%04x%04x\n", addr[0], addr[1], addr[2], addr[3]))
 341         return 0;
 342 }
 343
 344 static struct scsi_host_template driver_template = {
 345         .name                   = "Sparc Storage Array 100/200",
 346         .detect                 = pluto_detect,
 347         .release                = pluto_release,
 348         .info                   = pluto_info,
 349         .queuecommand           = fcp_scsi_queuecommand,
 350         .slave_configure        = pluto_slave_configure,
 351         .can_queue              = PLUTO_CAN_QUEUE,
 352         .this_id                = -1,
 353         .sg_tablesize           = 1,
 354         .cmd_per_lun            = 1,
 355         .use_clustering         = ENABLE_CLUSTERING,
 356         .eh_abort_handler       = fcp_scsi_abort,
 357         .eh_device_reset_handler = fcp_scsi_dev_reset,
 358         .eh_host_reset_handler  = fcp_scsi_host_reset,
 359 };
 360
 361 #include "scsi_module.c"
 362
 363 MODULE_LICENSE("GPL");
 364