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/malloc.h>
  12 #include <linux/blk.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 "hosts.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 struct proc_dir_entry proc_scsi_pluto = {
  43         PROC_SCSI_PLUTO, 5, "pluto",
  44         S_IFDIR | S_IRUGO | S_IXUGO, 2
  45 };
  46
  47 static struct ctrl_inquiry {
  48         struct Scsi_Host host;
  49         struct pluto pluto;
  50         Scsi_Cmnd cmd;
  51         char inquiry[256];
  52         fc_channel *fc;
  53 } *fcs __initdata = { 0 };
  54 static int fcscount __initdata = 0;
  55 static atomic_t fcss __initdata = ATOMIC_INIT(0);
  56 static struct timer_list fc_timer __initdata = { 0 };
  57 DECLARE_MUTEX_LOCKED(fc_sem);
  58
  59 static int pluto_encode_addr(Scsi_Cmnd *SCpnt, u16 *addr, fc_channel *fc, fcp_cmnd *fcmd);
  60
  61 static void __init pluto_detect_timeout(unsigned long data)
  62 {
  63         PLND(("Timeout\n"))
  64         up(&fc_sem);
  65 }
  66
  67 static void __init pluto_detect_done(Scsi_Cmnd *SCpnt)
  68 {
  69         /* Do nothing */
  70 }
  71
  72 static void __init pluto_detect_scsi_done(Scsi_Cmnd *SCpnt)
  73 {
  74         SCpnt->request.rq_status = RQ_SCSI_DONE;
  75         PLND(("Detect done %08lx\n", (long)SCpnt))
  76         if (atomic_dec_and_test (&fcss))
  77                 up(&fc_sem);
  78 }
  79
  80 static void pluto_select_queue_depths(struct Scsi_Host *host, Scsi_Device *devlist)
  81 {
  82         Scsi_Device *device;
  83
  84         for (device = devlist; device; device = device->next) {
  85                 if (device->host != host) continue;
  86                 if (device->tagged_supported)
  87                         device->queue_depth = /* 254 */ 8;
  88                 else
  89                         device->queue_depth = 2;
  90         }
  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(Scsi_Host_Template *tpnt)
  96 {
  97         int i, retry, nplutos;
  98         fc_channel *fc;
  99         Scsi_Device dev;
 100
 101         tpnt->proc_dir = &proc_scsi_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 *) scsi_init_malloc (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         fc_timer.function = pluto_detect_timeout;
 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->host = host;
 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
 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(&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) panic ("Cannot register PLUTO host\n");
 231
 232                                 nplutos++;
 233
 234                                 if (fc->module) __MOD_INC_USE_COUNT(fc->module);
 235
 236                                 pluto = (struct pluto *)host->hostdata;
 237
 238                                 host->max_id = inq->targets;
 239                                 host->max_channel = inq->channels;
 240                                 host->irq = fc->irq;
 241
 242 #ifdef __sparc_v9__
 243                                 host->unchecked_isa_dma = 1;
 244 #endif
 245
 246                                 host->select_queue_depths = pluto_select_queue_depths;
 247
 248                                 fc->channels = inq->channels + 1;
 249                                 fc->targets = inq->targets;
 250                                 fc->ages = ages;
 251                                 memset (ages, 0, ((inq->channels + 1) * inq->targets) * sizeof(long));
 252
 253                                 pluto->fc = fc;
 254                                 memcpy (pluto->rev_str, inq->revision, 4);
 255                                 pluto->rev_str[4] = 0;
 256                                 p = strchr (pluto->rev_str, ' ');
 257                                 if (p) *p = 0;
 258                                 memcpy (pluto->fw_rev_str, inq->fw_revision, 4);
 259                                 pluto->fw_rev_str[4] = 0;
 260                                 p = strchr (pluto->fw_rev_str, ' ');
 261                                 if (p) *p = 0;
 262                                 memcpy (pluto->serial_str, inq->serial, 12);
 263                                 pluto->serial_str[12] = 0;
 264                                 p = strchr (pluto->serial_str, ' ');
 265                                 if (p) *p = 0;
 266
 267                                 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))
 268                         } else
 269                                 fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 270                 } else
 271                         fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 272         }
 273         scsi_init_free((char *)fcs, sizeof (struct ctrl_inquiry) * fcscount);
 274         if (nplutos)
 275                 printk ("PLUTO: Total of %d SparcSTORAGE Arrays found\n", nplutos);
 276         return nplutos;
 277 }
 278
 279 int pluto_release(struct Scsi_Host *host)
 280 {
 281         struct pluto *pluto = (struct pluto *)host->hostdata;
 282         fc_channel *fc = pluto->fc;
 283
 284         if (fc->module) __MOD_DEC_USE_COUNT(fc->module);
 285
 286         fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 287         PLND((" releasing pluto.\n"));
 288         kfree (fc->ages);
 289         PLND(("released pluto!\n"));
 290         return 0;
 291 }
 292
 293 const char *pluto_info(struct Scsi_Host *host)
 294 {
 295         static char buf[80];
 296         struct pluto *pluto = (struct pluto *) host->hostdata;
 297
 298         sprintf(buf, "SUN SparcSTORAGE Array %s fw %s serial %s %dx%d on %s",
 299                 pluto->rev_str, pluto->fw_rev_str, pluto->serial_str,
 300                 host->max_channel, host->max_id, pluto->fc->name);
 301         return buf;
 302 }
 303
 304 /* SSA uses this FC4S addressing:
 305    switch (addr[0])
 306    {
 307    case 0: CONTROLLER - All of addr[1]..addr[3] has to be 0
 308    case 1: SINGLE DISK - addr[1] channel, addr[2] id, addr[3] 0
 309    case 2: DISK GROUP - ???
 310    }
 311
 312    So that SCSI mid-layer can access to these, we reserve
 313    channel 0 id 0 lun 0 for CONTROLLER
 314    and channels 1 .. max_channel are normal single disks.
 315  */
 316 static int pluto_encode_addr(Scsi_Cmnd *SCpnt, u16 *addr, fc_channel *fc, fcp_cmnd *fcmd)
 317 {
 318         PLND(("encode addr %d %d %d\n", SCpnt->channel, SCpnt->target, SCpnt->cmnd[1] & 0xe0))
 319         /* We don't support LUNs - neither does SSA :) */
 320         if (SCpnt->cmnd[1] & 0xe0) return -EINVAL;
 321         if (!SCpnt->channel) {
 322                 if (SCpnt->target) return -EINVAL;
 323                 memset (addr, 0, 4 * sizeof(u16));
 324         } else {
 325                 addr[0] = 1;
 326                 addr[1] = SCpnt->channel - 1;
 327                 addr[2] = SCpnt->target;
 328                 addr[3] = 0;
 329         }
 330         /* We're Point-to-Point, so target it to the default DID */
 331         fcmd->did = fc->did;
 332         PLND(("trying %04x%04x%04x%04x\n", addr[0], addr[1], addr[2], addr[3]))
 333         return 0;
 334 }
 335
 336 #ifdef MODULE
 337
 338 Scsi_Host_Template driver_template = PLUTO;
 339
 340 #include "scsi_module.c"
 341
 342 EXPORT_NO_SYMBOLS;
 343 #endif /* MODULE */