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