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 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 DECLARE_MUTEX_LOCKED(fc_sem);
  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_timeout(unsigned long data)
  59 {
  60         PLND(("Timeout\n"))
  61         up(&fc_sem);
  62 }
  63
  64 static void __init pluto_detect_done(Scsi_Cmnd *SCpnt)
  65 {
  66         /* Do nothing */
  67 }
  68
  69 static void __init pluto_detect_scsi_done(Scsi_Cmnd *SCpnt)
  70 {
  71         SCpnt->request->rq_status = RQ_SCSI_DONE;
  72         PLND(("Detect done %08lx\n", (long)SCpnt))
  73         if (atomic_dec_and_test (&fcss))
  74                 up(&fc_sem);
  75 }
  76
  77 int pluto_slave_configure(struct scsi_device *device)
  78 {
  79         int depth_to_use;
  80
  81         if (device->tagged_supported)
  82                 depth_to_use = /* 254 */ 8;
  83         else
  84                 depth_to_use = 2;
  85
  86         scsi_adjust_queue_depth(device,
  87                                 (device->tagged_supported ?
  88                                  MSG_SIMPLE_TAG : 0),
  89                                 depth_to_use);
  90
  91         return 0;
  92 }
  93
  94 /* Detect all SSAs attached to the machine.
  95    To be fast, do it on all online FC channels at the same time. */
  96 int __init pluto_detect(struct scsi_host_template *tpnt)
  97 {
  98         int i, retry, nplutos;
  99         fc_channel *fc;
 100         struct scsi_device dev;
 101         DEFINE_TIMER(fc_timer, pluto_detect_timeout, 0, 0);
 102
 103         tpnt->proc_name = "pluto";
 104         fcscount = 0;
 105         for_each_online_fc_channel(fc) {
 106                 if (!fc->posmap)
 107                         fcscount++;
 108         }
 109         PLND(("%d channels online\n", fcscount))
 110         if (!fcscount) {
 111 #if defined(MODULE) && defined(CONFIG_FC4_SOC_MODULE) && defined(CONFIG_KMOD)
 112                 request_module("soc");
 113
 114                 for_each_online_fc_channel(fc) {
 115                         if (!fc->posmap)
 116                                 fcscount++;
 117                 }
 118                 if (!fcscount)
 119 #endif
 120                         return 0;
 121         }
 122         fcs = (struct ctrl_inquiry *) kmalloc (sizeof (struct ctrl_inquiry) * fcscount, GFP_DMA);
 123         if (!fcs) {
 124                 printk ("PLUTO: Not enough memory to probe\n");
 125                 return 0;
 126         }
 127
 128         memset (fcs, 0, sizeof (struct ctrl_inquiry) * fcscount);
 129         memset (&dev, 0, sizeof(dev));
 130         atomic_set (&fcss, fcscount);
 131
 132         i = 0;
 133         for_each_online_fc_channel(fc) {
 134                 Scsi_Cmnd *SCpnt;
 135                 struct Scsi_Host *host;
 136                 struct pluto *pluto;
 137
 138                 if (i == fcscount) break;
 139                 if (fc->posmap) continue;
 140
 141                 PLD(("trying to find SSA\n"))
 142
 143                 /* If this is already registered to some other SCSI host, then it cannot be pluto */
 144                 if (fc->scsi_name[0]) continue;
 145                 memcpy (fc->scsi_name, "SSA", 4);
 146
 147                 fcs[i].fc = fc;
 148
 149                 fc->can_queue = PLUTO_CAN_QUEUE;
 150                 fc->rsp_size = 64;
 151                 fc->encode_addr = pluto_encode_addr;
 152
 153                 fc->fcp_register(fc, TYPE_SCSI_FCP, 0);
 154
 155                 SCpnt = &(fcs[i].cmd);
 156                 host = &(fcs[i].host);
 157                 pluto = (struct pluto *)host->hostdata;
 158
 159                 pluto->fc = fc;
 160
 161                 SCpnt->cmnd[0] = INQUIRY;
 162                 SCpnt->cmnd[4] = 255;
 163
 164                 /* FC layer requires this, so that SCpnt->device->tagged_supported is initially 0 */
 165                 SCpnt->device = &dev;
 166                 dev.host = host;
 167
 168                 SCpnt->cmd_len = COMMAND_SIZE(INQUIRY);
 169
 170                 SCpnt->request->rq_status = RQ_SCSI_BUSY;
 171
 172                 SCpnt->done = pluto_detect_done;
 173                 SCpnt->bufflen = 256;
 174                 SCpnt->buffer = fcs[i].inquiry;
 175                 SCpnt->request_bufflen = 256;
 176                 SCpnt->request_buffer = fcs[i].inquiry;
 177                 PLD(("set up %d %08lx\n", i, (long)SCpnt))
 178                 i++;
 179         }
 180
 181         for (retry = 0; retry < 5; retry++) {
 182                 for (i = 0; i < fcscount; i++) {
 183                         if (!fcs[i].fc) break;
 184                         if (fcs[i].cmd.request->rq_status != RQ_SCSI_DONE) {
 185                                 disable_irq(fcs[i].fc->irq);
 186                                 PLND(("queuecommand %d %d\n", retry, i))
 187                                 fcp_scsi_queuecommand (&(fcs[i].cmd),
 188                                         pluto_detect_scsi_done);
 189                                 enable_irq(fcs[i].fc->irq);
 190                         }
 191                 }
 192
 193                 fc_timer.expires = jiffies + 10 * HZ;
 194                 add_timer(&fc_timer);
 195
 196                 down(&fc_sem);
 197                 PLND(("Woken up\n"))
 198                 if (!atomic_read(&fcss))
 199                         break; /* All fc channels have answered us */
 200         }
 201         del_timer_sync(&fc_timer);
 202
 203         PLND(("Finished search\n"))
 204         for (i = 0, nplutos = 0; i < fcscount; i++) {
 205                 Scsi_Cmnd *SCpnt;
 206
 207                 if (!(fc = fcs[i].fc)) break;
 208
 209                 SCpnt = &(fcs[i].cmd);
 210
 211                 /* Let FC mid-level free allocated resources */
 212                 SCpnt->done (SCpnt);
 213
 214                 if (!SCpnt->result) {
 215                         struct pluto_inquiry *inq;
 216                         struct pluto *pluto;
 217                         struct Scsi_Host *host;
 218
 219                         inq = (struct pluto_inquiry *)fcs[i].inquiry;
 220
 221                         if ((inq->dtype & 0x1f) == TYPE_PROCESSOR &&
 222                             !strncmp (inq->vendor_id, "SUN", 3) &&
 223                             !strncmp (inq->product_id, "SSA", 3)) {
 224                                 char *p;
 225                                 long *ages;
 226
 227                                 ages = kmalloc (((inq->channels + 1) * inq->targets) * sizeof(long), GFP_KERNEL);
 228                                 if (!ages) continue;
 229
 230                                 host = scsi_register (tpnt, sizeof (struct pluto));
 231                                 if(!host)
 232                                 {
 233                                         kfree(ages);
 234                                         continue;
 235                                 }
 236
 237                                 if (!try_module_get(fc->module)) {
 238                                         kfree(ages);
 239                                         scsi_unregister(host);
 240                                         continue;
 241                                 }
 242
 243                                 nplutos++;
 244
 245                                 pluto = (struct pluto *)host->hostdata;
 246
 247                                 host->max_id = inq->targets;
 248                                 host->max_channel = inq->channels;
 249                                 host->irq = fc->irq;
 250
 251                                 fc->channels = inq->channels + 1;
 252                                 fc->targets = inq->targets;
 253                                 fc->ages = ages;
 254                                 memset (ages, 0, ((inq->channels + 1) * inq->targets) * sizeof(long));
 255
 256                                 pluto->fc = fc;
 257                                 memcpy (pluto->rev_str, inq->revision, 4);
 258                                 pluto->rev_str[4] = 0;
 259                                 p = strchr (pluto->rev_str, ' ');
 260                                 if (p) *p = 0;
 261                                 memcpy (pluto->fw_rev_str, inq->fw_revision, 4);
 262                                 pluto->fw_rev_str[4] = 0;
 263                                 p = strchr (pluto->fw_rev_str, ' ');
 264                                 if (p) *p = 0;
 265                                 memcpy (pluto->serial_str, inq->serial, 12);
 266                                 pluto->serial_str[12] = 0;
 267                                 p = strchr (pluto->serial_str, ' ');
 268                                 if (p) *p = 0;
 269
 270                                 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))
 271                         } else
 272                                 fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 273                 } else
 274                         fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 275         }
 276         kfree((char *)fcs);
 277         if (nplutos)
 278                 printk ("PLUTO: Total of %d SparcSTORAGE Arrays found\n", nplutos);
 279         return nplutos;
 280 }
 281
 282 int pluto_release(struct Scsi_Host *host)
 283 {
 284         struct pluto *pluto = (struct pluto *)host->hostdata;
 285         fc_channel *fc = pluto->fc;
 286
 287         module_put(fc->module);
 288
 289         fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 290         PLND((" releasing pluto.\n"));
 291         kfree (fc->ages);
 292         PLND(("released pluto!\n"));
 293         return 0;
 294 }
 295
 296 const char *pluto_info(struct Scsi_Host *host)
 297 {
 298         static char buf[128], *p;
 299         struct pluto *pluto = (struct pluto *) host->hostdata;
 300
 301         sprintf(buf, "SUN SparcSTORAGE Array %s fw %s serial %s %dx%d on %s",
 302                 pluto->rev_str, pluto->fw_rev_str, pluto->serial_str,
 303                 host->max_channel, host->max_id, pluto->fc->name);
 304 #ifdef __sparc__
 305         p = strchr(buf, 0);
 306         sprintf(p, " PROM node %x", pluto->fc->dev->prom_node);
 307 #endif
 308         return buf;
 309 }
 310
 311 /* SSA uses this FC4S addressing:
 312    switch (addr[0])
 313    {
 314    case 0: CONTROLLER - All of addr[1]..addr[3] has to be 0
 315    case 1: SINGLE DISK - addr[1] channel, addr[2] id, addr[3] 0
 316    case 2: DISK GROUP - ???
 317    }
 318
 319    So that SCSI mid-layer can access to these, we reserve
 320    channel 0 id 0 lun 0 for CONTROLLER
 321    and channels 1 .. max_channel are normal single disks.
 322  */
 323 static int pluto_encode_addr(Scsi_Cmnd *SCpnt, u16 *addr, fc_channel *fc, fcp_cmnd *fcmd)
 324 {
 325         PLND(("encode addr %d %d %d\n", SCpnt->device->channel, SCpnt->device->id, SCpnt->cmnd[1] & 0xe0))
 326         /* We don't support LUNs - neither does SSA :) */
 327         if (SCpnt->cmnd[1] & 0xe0)
 328                 return -EINVAL;
 329         if (!SCpnt->device->channel) {
 330                 if (SCpnt->device->id)
 331                         return -EINVAL;
 332                 memset (addr, 0, 4 * sizeof(u16));
 333         } else {
 334                 addr[0] = 1;
 335                 addr[1] = SCpnt->device->channel - 1;
 336                 addr[2] = SCpnt->device->id;
 337                 addr[3] = 0;
 338         }
 339         /* We're Point-to-Point, so target it to the default DID */
 340         fcmd->did = fc->did;
 341         PLND(("trying %04x%04x%04x%04x\n", addr[0], addr[1], addr[2], addr[3]))
 342         return 0;
 343 }
 344
 345 static struct scsi_host_template driver_template = {
 346         .name                   = "Sparc Storage Array 100/200",
 347         .detect                 = pluto_detect,
 348         .release                = pluto_release,
 349         .info                   = pluto_info,
 350         .queuecommand           = fcp_scsi_queuecommand,
 351         .slave_configure        = pluto_slave_configure,
 352         .can_queue              = PLUTO_CAN_QUEUE,
 353         .this_id                = -1,
 354         .sg_tablesize           = 1,
 355         .cmd_per_lun            = 1,
 356         .use_clustering         = ENABLE_CLUSTERING,
 357         .eh_abort_handler       = fcp_scsi_abort,
 358         .eh_device_reset_handler = fcp_scsi_dev_reset,
 359         .eh_host_reset_handler  = fcp_scsi_host_reset,
 360 };
 361
 362 #include "scsi_module.c"
 363
 364 MODULE_LICENSE("GPL");
 365