patch-2.4.13 linux/drivers/i2o/i2o_scsi.c
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- Lines: 913
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
v2.4.12/linux/drivers/i2o/i2o_scsi.c
- Orig date:
Mon Aug 27 12:41:41 2001
diff -u --recursive --new-file v2.4.12/linux/drivers/i2o/i2o_scsi.c linux/drivers/i2o/i2o_scsi.c
@@ -1,912 +0,0 @@
-/*
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * Complications for I2O scsi
- *
- * o Each (bus,lun) is a logical device in I2O. We keep a map
- * table. We spoof failed selection for unmapped units
- * o Request sense buffers can come back for free.
- * o Scatter gather is a bit dynamic. We have to investigate at
- * setup time.
- * o Some of our resources are dynamically shared. The i2o core
- * needs a message reservation protocol to avoid swap v net
- * deadlocking. We need to back off queue requests.
- *
- * In general the firmware wants to help. Where its help isn't performance
- * useful we just ignore the aid. Its not worth the code in truth.
- *
- * Fixes:
- * Steve Ralston : Scatter gather now works
- *
- * To Do
- * 64bit cleanups
- * Fix the resource management problems.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/ioport.h>
-#include <linux/sched.h>
-#include <linux/interrupt.h>
-#include <linux/timer.h>
-#include <linux/delay.h>
-#include <linux/proc_fs.h>
-#include <asm/dma.h>
-#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/atomic.h>
-#include <linux/blk.h>
-#include <linux/version.h>
-#include <linux/i2o.h>
-#include "../scsi/scsi.h"
-#include "../scsi/hosts.h"
-#include "../scsi/sd.h"
-#include "i2o_scsi.h"
-
-#define VERSION_STRING "Version 0.0.1"
-
-#define dprintk(x)
-
-#define MAXHOSTS 32
-
-struct i2o_scsi_host
-{
- struct i2o_controller *controller;
- s16 task[16][8]; /* Allow 16 devices for now */
- unsigned long tagclock[16][8]; /* Tag clock for queueing */
- s16 bus_task; /* The adapter TID */
-};
-
-static int scsi_context;
-static int lun_done;
-static int i2o_scsi_hosts;
-
-static u32 *retry[32];
-static struct i2o_controller *retry_ctrl[32];
-static struct timer_list retry_timer;
-static int retry_ct = 0;
-
-static atomic_t queue_depth;
-
-/*
- * SG Chain buffer support...
- */
-
-#define SG_MAX_FRAGS 64
-
-/*
- * FIXME: we should allocate one of these per bus we find as we
- * locate them not in a lump at boot.
- */
-
-typedef struct _chain_buf
-{
- u32 sg_flags_cnt[SG_MAX_FRAGS];
- u32 sg_buf[SG_MAX_FRAGS];
-} chain_buf;
-
-#define SG_CHAIN_BUF_SZ sizeof(chain_buf)
-
-#define SG_MAX_BUFS (i2o_num_controllers * I2O_SCSI_CAN_QUEUE)
-#define SG_CHAIN_POOL_SZ (SG_MAX_BUFS * SG_CHAIN_BUF_SZ)
-
-static int max_sg_len = 0;
-static chain_buf *sg_chain_pool = NULL;
-static int sg_chain_tag = 0;
-static int sg_max_frags = SG_MAX_FRAGS;
-
-/*
- * Retry congested frames. This actually needs pushing down into
- * i2o core. We should only bother the OSM with this when we can't
- * queue and retry the frame. Or perhaps we should call the OSM
- * and its default handler should be this in the core, and this
- * call a 2nd "I give up" handler in the OSM ?
- */
-
-static void i2o_retry_run(unsigned long f)
-{
- int i;
- unsigned long flags;
-
- save_flags(flags);
- cli();
-
- for(i=0;i<retry_ct;i++)
- i2o_post_message(retry_ctrl[i], virt_to_bus(retry[i]));
- retry_ct=0;
-
- restore_flags(flags);
-}
-
-static void flush_pending(void)
-{
- int i;
- unsigned long flags;
-
- save_flags(flags);
- cli();
-
- for(i=0;i<retry_ct;i++)
- {
- retry[i][0]&=~0xFFFFFF;
- retry[i][0]|=I2O_CMD_UTIL_NOP<<24;
- i2o_post_message(retry_ctrl[i],virt_to_bus(retry[i]));
- }
- retry_ct=0;
-
- restore_flags(flags);
-}
-
-static void i2o_scsi_reply(struct i2o_handler *h, struct i2o_controller *c, struct i2o_message *msg)
-{
- Scsi_Cmnd *current_command;
- u32 *m = (u32 *)msg;
- u8 as,ds,st;
-
- if(m[0] & (1<<13))
- {
- printk("IOP fail.\n");
- printk("From %d To %d Cmd %d.\n",
- (m[1]>>12)&0xFFF,
- m[1]&0xFFF,
- m[1]>>24);
- printk("Failure Code %d.\n", m[4]>>24);
- if(m[4]&(1<<16))
- printk("Format error.\n");
- if(m[4]&(1<<17))
- printk("Path error.\n");
- if(m[4]&(1<<18))
- printk("Path State.\n");
- if(m[4]&(1<<18))
- printk("Congestion.\n");
-
- m=(u32 *)bus_to_virt(m[7]);
- printk("Failing message is %p.\n", m);
-
- if((m[4]&(1<<18)) && retry_ct < 32)
- {
- retry_ctrl[retry_ct]=c;
- retry[retry_ct]=m;
- if(!retry_ct++)
- {
- retry_timer.expires=jiffies+1;
- add_timer(&retry_timer);
- }
- }
- else
- {
- /* Create a scsi error for this */
- current_command = (Scsi_Cmnd *)m[3];
- printk("Aborted %ld\n", current_command->serial_number);
-
- spin_lock_irq(&io_request_lock);
- current_command->result = DID_ERROR << 16;
- current_command->scsi_done(current_command);
- spin_unlock_irq(&io_request_lock);
-
- /* Now flush the message by making it a NOP */
- m[0]&=0x00FFFFFF;
- m[0]|=(I2O_CMD_UTIL_NOP)<<24;
- i2o_post_message(c,virt_to_bus(m));
- }
- return;
- }
-
-
- /*
- * Low byte is device status, next is adapter status,
- * (then one byte reserved), then request status.
- */
- ds=(u8)m[4];
- as=(u8)(m[4]>>8);
- st=(u8)(m[4]>>24);
-
- dprintk(("i2o got a scsi reply %08X: ", m[0]));
- dprintk(("m[2]=%08X: ", m[2]));
- dprintk(("m[4]=%08X\n", m[4]));
-
- if(m[2]&0x80000000)
- {
- if(m[2]&0x40000000)
- {
- dprintk(("Event.\n"));
- lun_done=1;
- return;
- }
- printk(KERN_ERR "i2o_scsi: bus reset reply.\n");
- return;
- }
-
- current_command = (Scsi_Cmnd *)m[3];
-
- /*
- * Is this a control request coming back - eg an abort ?
- */
-
- if(current_command==NULL)
- {
- if(st)
- dprintk(("SCSI abort: %08X", m[4]));
- dprintk(("SCSI abort completed.\n"));
- return;
- }
-
- dprintk(("Completed %ld\n", current_command->serial_number));
-
- atomic_dec(&queue_depth);
-
- if(st == 0x06)
- {
- if(m[5] < current_command->underflow)
- {
- int i;
- printk(KERN_ERR "SCSI: underflow 0x%08X 0x%08X\n",
- m[5], current_command->underflow);
- printk("Cmd: ");
- for(i=0;i<15;i++)
- printk("%02X ", current_command->cmnd[i]);
- printk(".\n");
- }
- else st=0;
- }
-
- if(st)
- {
- /* An error has occurred */
-
- dprintk((KERN_DEBUG "SCSI error %08X", m[4]));
-
- if (as == 0x0E)
- /* SCSI Reset */
- current_command->result = DID_RESET << 16;
- else if (as == 0x0F)
- current_command->result = DID_PARITY << 16;
- else
- current_command->result = DID_ERROR << 16;
- }
- else
- /*
- * It worked maybe ?
- */
- current_command->result = DID_OK << 16 | ds;
- spin_lock(&io_request_lock);
- current_command->scsi_done(current_command);
- spin_unlock(&io_request_lock);
- return;
-}
-
-struct i2o_handler i2o_scsi_handler=
-{
- i2o_scsi_reply,
- NULL,
- NULL,
- NULL,
- "I2O SCSI OSM",
- 0,
- I2O_CLASS_SCSI_PERIPHERAL
-};
-
-static int i2o_find_lun(struct i2o_controller *c, struct i2o_device *d, int *target, int *lun)
-{
- u8 reply[8];
-
- if(i2o_query_scalar(c, d->lct_data.tid, 0, 3, reply, 4)<0)
- return -1;
-
- *target=reply[0];
-
- if(i2o_query_scalar(c, d->lct_data.tid, 0, 4, reply, 8)<0)
- return -1;
-
- *lun=reply[1];
-
- dprintk(("SCSI (%d,%d)\n", *target, *lun));
- return 0;
-}
-
-void i2o_scsi_init(struct i2o_controller *c, struct i2o_device *d, struct Scsi_Host *shpnt)
-{
- struct i2o_device *unit;
- struct i2o_scsi_host *h =(struct i2o_scsi_host *)shpnt->hostdata;
- int lun;
- int target;
-
- h->controller=c;
- h->bus_task=d->lct_data.tid;
-
- for(target=0;target<16;target++)
- for(lun=0;lun<8;lun++)
- h->task[target][lun] = -1;
-
- for(unit=c->devices;unit!=NULL;unit=unit->next)
- {
- dprintk(("Class %03X, parent %d, want %d.\n",
- unit->lct_data.class_id, unit->lct_data.parent_tid, d->lct_data.tid));
-
- /* Only look at scsi and fc devices */
- if ( (unit->lct_data.class_id != I2O_CLASS_SCSI_PERIPHERAL)
- && (unit->lct_data.class_id != I2O_CLASS_FIBRE_CHANNEL_PERIPHERAL)
- )
- continue;
-
- /* On our bus ? */
- dprintk(("Found a disk (%d).\n", unit->lct_data.tid));
- if ((unit->lct_data.parent_tid == d->lct_data.tid)
- || (unit->lct_data.parent_tid == d->lct_data.parent_tid)
- )
- {
- u16 limit;
- dprintk(("Its ours.\n"));
- if(i2o_find_lun(c, unit, &target, &lun)==-1)
- {
- printk(KERN_ERR "i2o_scsi: Unable to get lun for tid %d.\n", unit->lct_data.tid);
- continue;
- }
- dprintk(("Found disk %d %d.\n", target, lun));
- h->task[target][lun]=unit->lct_data.tid;
- h->tagclock[target][lun]=jiffies;
-
- /* Get the max fragments/request */
- i2o_query_scalar(c, d->lct_data.tid, 0xF103, 3, &limit, 2);
-
- /* sanity */
- if ( limit == 0 )
- {
- printk(KERN_WARNING "i2o_scsi: Ignoring unreasonable SG limit of 0 from IOP!\n");
- limit = 1;
- }
-
- shpnt->sg_tablesize = limit;
-
- dprintk(("i2o_scsi: set scatter-gather to %d.\n",
- shpnt->sg_tablesize));
- }
- }
-}
-
-int i2o_scsi_detect(Scsi_Host_Template * tpnt)
-{
- unsigned long flags;
- struct Scsi_Host *shpnt = NULL;
- int i;
- int count;
-
- printk("i2o_scsi.c: %s\n", VERSION_STRING);
-
- if(i2o_install_handler(&i2o_scsi_handler)<0)
- {
- printk(KERN_ERR "i2o_scsi: Unable to install OSM handler.\n");
- return 0;
- }
- scsi_context = i2o_scsi_handler.context;
-
- if((sg_chain_pool = kmalloc(SG_CHAIN_POOL_SZ, GFP_KERNEL)) == NULL)
- {
- printk("i2o_scsi: Unable to alloc %d byte SG chain buffer pool.\n", SG_CHAIN_POOL_SZ);
- printk("i2o_scsi: SG chaining DISABLED!\n");
- sg_max_frags = 11;
- }
- else
- {
- printk(" chain_pool: %d bytes @ %p\n", SG_CHAIN_POOL_SZ, sg_chain_pool);
- printk(" (%d byte buffers X %d can_queue X %d i2o controllers)\n",
- SG_CHAIN_BUF_SZ, I2O_SCSI_CAN_QUEUE, i2o_num_controllers);
- sg_max_frags = SG_MAX_FRAGS; // 64
- }
-
- init_timer(&retry_timer);
- retry_timer.data = 0UL;
- retry_timer.function = i2o_retry_run;
-
-// printk("SCSI OSM at %d.\n", scsi_context);
-
- for (count = 0, i = 0; i < MAX_I2O_CONTROLLERS; i++)
- {
- struct i2o_controller *c=i2o_find_controller(i);
- struct i2o_device *d;
- /*
- * This controller doesn't exist.
- */
-
- if(c==NULL)
- continue;
-
- /*
- * Fixme - we need some altered device locking. This
- * is racing with device addition in theory. Easy to fix.
- */
-
- for(d=c->devices;d!=NULL;d=d->next)
- {
- /*
- * bus_adapter, SCSI (obsolete), or FibreChannel busses only
- */
- if( (d->lct_data.class_id!=I2O_CLASS_BUS_ADAPTER_PORT) // bus_adapter
-// && (d->lct_data.class_id!=I2O_CLASS_FIBRE_CHANNEL_PORT) // FC_PORT
- )
- continue;
-
- shpnt = scsi_register(tpnt, sizeof(struct i2o_scsi_host));
- if(shpnt==NULL)
- continue;
- save_flags(flags);
- cli();
- shpnt->unique_id = (u32)d;
- shpnt->io_port = 0;
- shpnt->n_io_port = 0;
- shpnt->irq = 0;
- shpnt->this_id = /* Good question */15;
- restore_flags(flags);
- i2o_scsi_init(c, d, shpnt);
- count++;
- }
- }
- i2o_scsi_hosts = count;
-
- if(count==0)
- {
- if(sg_chain_pool!=NULL)
- {
- kfree(sg_chain_pool);
- sg_chain_pool = NULL;
- }
- flush_pending();
- del_timer(&retry_timer);
- i2o_remove_handler(&i2o_scsi_handler);
- }
-
- return count;
-}
-
-int i2o_scsi_release(struct Scsi_Host *host)
-{
- if(--i2o_scsi_hosts==0)
- {
- if(sg_chain_pool!=NULL)
- {
- kfree(sg_chain_pool);
- sg_chain_pool = NULL;
- }
- flush_pending();
- del_timer(&retry_timer);
- i2o_remove_handler(&i2o_scsi_handler);
- }
- return 0;
-}
-
-
-const char *i2o_scsi_info(struct Scsi_Host *SChost)
-{
- struct i2o_scsi_host *hostdata;
-
- hostdata = (struct i2o_scsi_host *)SChost->hostdata;
-
- return(&hostdata->controller->name[0]);
-}
-
-
-/*
- * From the wd93 driver:
- * Returns true if there will be a DATA_OUT phase with this command,
- * false otherwise.
- * (Thanks to Joerg Dorchain for the research and suggestion.)
- *
- */
-static int is_dir_out(Scsi_Cmnd *cmd)
-{
- switch (cmd->cmnd[0])
- {
- case WRITE_6: case WRITE_10: case WRITE_12:
- case WRITE_LONG: case WRITE_SAME: case WRITE_BUFFER:
- case WRITE_VERIFY: case WRITE_VERIFY_12:
- case COMPARE: case COPY: case COPY_VERIFY:
- case SEARCH_EQUAL: case SEARCH_HIGH: case SEARCH_LOW:
- case SEARCH_EQUAL_12: case SEARCH_HIGH_12: case SEARCH_LOW_12:
- case FORMAT_UNIT: case REASSIGN_BLOCKS: case RESERVE:
- case MODE_SELECT: case MODE_SELECT_10: case LOG_SELECT:
- case SEND_DIAGNOSTIC: case CHANGE_DEFINITION: case UPDATE_BLOCK:
- case SET_WINDOW: case MEDIUM_SCAN: case SEND_VOLUME_TAG:
- case 0xea:
- return 1;
- default:
- return 0;
- }
-}
-
-int i2o_scsi_queuecommand(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
-{
- int i;
- int tid;
- struct i2o_controller *c;
- Scsi_Cmnd *current_command;
- struct Scsi_Host *host;
- struct i2o_scsi_host *hostdata;
- u32 *msg, *mptr;
- u32 m;
- u32 *lenptr;
- int direction;
- int scsidir;
- u32 len;
- u32 reqlen;
- u32 tag;
-
- static int max_qd = 1;
-
- /*
- * Do the incoming paperwork
- */
-
- host = SCpnt->host;
- hostdata = (struct i2o_scsi_host *)host->hostdata;
- SCpnt->scsi_done = done;
-
- if(SCpnt->target > 15)
- {
- printk(KERN_ERR "i2o_scsi: Wild target %d.\n", SCpnt->target);
- return -1;
- }
-
- tid = hostdata->task[SCpnt->target][SCpnt->lun];
-
- dprintk(("qcmd: Tid = %d\n", tid));
-
- current_command = SCpnt; /* set current command */
- current_command->scsi_done = done; /* set ptr to done function */
-
- /* We don't have such a device. Pretend we did the command
- and that selection timed out */
-
- if(tid == -1)
- {
- SCpnt->result = DID_NO_CONNECT << 16;
- done(SCpnt);
- return 0;
- }
-
- dprintk(("Real scsi messages.\n"));
-
- c = hostdata->controller;
-
- /*
- * Obtain an I2O message. Right now we _have_ to obtain one
- * until the scsi layer stuff is cleaned up.
- */
-
- do
- {
- mb();
- m = I2O_POST_READ32(c);
- }
- while(m==0xFFFFFFFF);
- msg = (u32 *)(c->mem_offset + m);
-
- /*
- * Put together a scsi execscb message
- */
-
- len = SCpnt->request_bufflen;
- direction = 0x00000000; // SGL IN (osm<--iop)
-
- /*
- * The scsi layer should be handling this stuff
- */
-
- scsidir = 0x00000000; // DATA NO XFER
- if(len)
- {
- if(is_dir_out(SCpnt))
- {
- direction=0x04000000; // SGL OUT (osm-->iop)
- scsidir =0x80000000; // DATA OUT (iop-->dev)
- }
- else
- {
- scsidir =0x40000000; // DATA IN (iop<--dev)
- }
- }
-
- __raw_writel(I2O_CMD_SCSI_EXEC<<24|HOST_TID<<12|tid, &msg[1]);
- __raw_writel(scsi_context, &msg[2]); /* So the I2O layer passes to us */
- /* Sorry 64bit folks. FIXME */
- __raw_writel((u32)SCpnt, &msg[3]); /* We want the SCSI control block back */
-
- /* LSI_920_PCI_QUIRK
- *
- * Intermittant observations of msg frame word data corruption
- * observed on msg[4] after:
- * WRITE, READ-MODIFY-WRITE
- * operations. 19990606 -sralston
- *
- * (Hence we build this word via tag. Its good practice anyway
- * we don't want fetches over PCI needlessly)
- */
-
- tag=0;
-
- /*
- * Attach tags to the devices
- */
- if(SCpnt->device->tagged_supported)
- {
- /*
- * Some drives are too stupid to handle fairness issues
- * with tagged queueing. We throw in the odd ordered
- * tag to stop them starving themselves.
- */
- if((jiffies - hostdata->tagclock[SCpnt->target][SCpnt->lun]) > (5*HZ))
- {
- tag=0x01800000; /* ORDERED! */
- hostdata->tagclock[SCpnt->target][SCpnt->lun]=jiffies;
- }
- else
- {
- /* Hmmm... I always see value of 0 here,
- * of which {HEAD_OF, ORDERED, SIMPLE} are NOT! -sralston
- */
- if(SCpnt->tag == HEAD_OF_QUEUE_TAG)
- tag=0x01000000;
- else if(SCpnt->tag == ORDERED_QUEUE_TAG)
- tag=0x01800000;
- }
- }
-
- /* Direction, disconnect ok, tag, CDBLen */
- __raw_writel(scsidir|0x20000000|SCpnt->cmd_len|tag, &msg[4]);
-
- mptr=msg+5;
-
- /*
- * Write SCSI command into the message - always 16 byte block
- */
-
- memcpy_toio(mptr, SCpnt->cmnd, 16);
- mptr+=4;
- lenptr=mptr++; /* Remember me - fill in when we know */
-
- reqlen = 12; // SINGLE SGE
-
- /*
- * Now fill in the SGList and command
- *
- * FIXME: we need to set the sglist limits according to the
- * message size of the I2O controller. We might only have room
- * for 6 or so worst case
- */
-
- if(SCpnt->use_sg)
- {
- struct scatterlist *sg = (struct scatterlist *)SCpnt->request_buffer;
- int chain = 0;
-
- len = 0;
-
- if((sg_max_frags > 11) && (SCpnt->use_sg > 11))
- {
- chain = 1;
- /*
- * Need to chain!
- */
- __raw_writel(direction|0xB0000000|(SCpnt->use_sg*2*4), mptr++);
- __raw_writel(virt_to_bus(sg_chain_pool + sg_chain_tag), mptr);
- mptr = (u32*)(sg_chain_pool + sg_chain_tag);
- if (SCpnt->use_sg > max_sg_len)
- {
- max_sg_len = SCpnt->use_sg;
- printk("i2o_scsi: Chain SG! SCpnt=%p, SG_FragCnt=%d, SG_idx=%d\n",
- SCpnt, SCpnt->use_sg, sg_chain_tag);
- }
- if ( ++sg_chain_tag == SG_MAX_BUFS )
- sg_chain_tag = 0;
- for(i = 0 ; i < SCpnt->use_sg; i++)
- {
- *mptr++=direction|0x10000000|sg->length;
- len+=sg->length;
- *mptr++=virt_to_bus(sg->address);
- sg++;
- }
- mptr[-2]=direction|0xD0000000|(sg-1)->length;
- }
- else
- {
- for(i = 0 ; i < SCpnt->use_sg; i++)
- {
- __raw_writel(direction|0x10000000|sg->length, mptr++);
- len+=sg->length;
- __raw_writel(virt_to_bus(sg->address), mptr++);
- sg++;
- }
-
- /* Make this an end of list. Again evade the 920 bug and
- unwanted PCI read traffic */
-
- __raw_writel(direction|0xD0000000|(sg-1)->length, &mptr[-2]);
- }
-
- if(!chain)
- reqlen = mptr - msg;
-
- __raw_writel(len, lenptr);
-
- if(len != SCpnt->underflow)
- printk("Cmd len %08X Cmd underflow %08X\n",
- len, SCpnt->underflow);
- }
- else
- {
- dprintk(("non sg for %p, %d\n", SCpnt->request_buffer,
- SCpnt->request_bufflen));
- __raw_writel(len = SCpnt->request_bufflen, lenptr);
- if(len == 0)
- {
- reqlen = 9;
- }
- else
- {
- __raw_writel(0xD0000000|direction|SCpnt->request_bufflen, mptr++);
- __raw_writel(virt_to_bus(SCpnt->request_buffer), mptr++);
- }
- }
-
- /*
- * Stick the headers on
- */
-
- __raw_writel(reqlen<<16 | SGL_OFFSET_10, msg);
-
- /* Queue the message */
- i2o_post_message(c,m);
-
- atomic_inc(&queue_depth);
-
- if(atomic_read(&queue_depth)> max_qd)
- {
- max_qd=atomic_read(&queue_depth);
- printk("Queue depth now %d.\n", max_qd);
- }
-
- mb();
- dprintk(("Issued %ld\n", current_command->serial_number));
-
- return 0;
-}
-
-static void internal_done(Scsi_Cmnd * SCpnt)
-{
- SCpnt->SCp.Status++;
-}
-
-int i2o_scsi_command(Scsi_Cmnd * SCpnt)
-{
- i2o_scsi_queuecommand(SCpnt, internal_done);
- SCpnt->SCp.Status = 0;
- while (!SCpnt->SCp.Status)
- barrier();
- return SCpnt->result;
-}
-
-int i2o_scsi_abort(Scsi_Cmnd * SCpnt)
-{
- struct i2o_controller *c;
- struct Scsi_Host *host;
- struct i2o_scsi_host *hostdata;
- u32 *msg;
- u32 m;
- int tid;
-
- printk("i2o_scsi: Aborting command block.\n");
-
- host = SCpnt->host;
- hostdata = (struct i2o_scsi_host *)host->hostdata;
- tid = hostdata->task[SCpnt->target][SCpnt->lun];
- if(tid==-1)
- {
- printk(KERN_ERR "impossible command to abort.\n");
- return SCSI_ABORT_NOT_RUNNING;
- }
- c = hostdata->controller;
-
- /*
- * Obtain an I2O message. Right now we _have_ to obtain one
- * until the scsi layer stuff is cleaned up.
- */
-
- do
- {
- mb();
- m = I2O_POST_READ32(c);
- }
- while(m==0xFFFFFFFF);
- msg = (u32 *)(c->mem_offset + m);
-
- __raw_writel(FIVE_WORD_MSG_SIZE, &msg[0]);
- __raw_writel(I2O_CMD_SCSI_ABORT<<24|HOST_TID<<12|tid, &msg[1]);
- __raw_writel(scsi_context, &msg[2]);
- __raw_writel(0, &msg[3]); /* Not needed for an abort */
- __raw_writel((u32)SCpnt, &msg[4]);
- wmb();
- i2o_post_message(c,m);
- wmb();
- return SCSI_ABORT_PENDING;
-}
-
-int i2o_scsi_reset(Scsi_Cmnd * SCpnt, unsigned int reset_flags)
-{
- int tid;
- struct i2o_controller *c;
- struct Scsi_Host *host;
- struct i2o_scsi_host *hostdata;
- u32 m;
- u32 *msg;
-
- /*
- * Find the TID for the bus
- */
-
- printk("i2o_scsi: Attempting to reset the bus.\n");
-
- host = SCpnt->host;
- hostdata = (struct i2o_scsi_host *)host->hostdata;
- tid = hostdata->bus_task;
- c = hostdata->controller;
-
- /*
- * Now send a SCSI reset request. Any remaining commands
- * will be aborted by the IOP. We need to catch the reply
- * possibly ?
- */
-
- m = I2O_POST_READ32(c);
-
- /*
- * No free messages, try again next time - no big deal
- */
-
- if(m == 0xFFFFFFFF)
- return SCSI_RESET_PUNT;
-
- msg = (u32 *)(c->mem_offset + m);
- __raw_writel(FOUR_WORD_MSG_SIZE|SGL_OFFSET_0, &msg[0]);
- __raw_writel(I2O_CMD_SCSI_BUSRESET<<24|HOST_TID<<12|tid, &msg[1]);
- __raw_writel(scsi_context|0x80000000, &msg[2]);
- /* We use the top bit to split controller and unit transactions */
- /* Now store unit,tid so we can tie the completion back to a specific device */
- __raw_writel(c->unit << 16 | tid, &msg[3]);
- wmb();
- i2o_post_message(c,m);
- return SCSI_RESET_PENDING;
-}
-
-/*
- * This is anyones guess quite frankly.
- */
-
-int i2o_scsi_bios_param(Disk * disk, kdev_t dev, int *ip)
-{
- int size;
-
- size = disk->capacity;
- ip[0] = 64; /* heads */
- ip[1] = 32; /* sectors */
- if ((ip[2] = size >> 11) > 1024) { /* cylinders, test for big disk */
- ip[0] = 255; /* heads */
- ip[1] = 63; /* sectors */
- ip[2] = size / (255 * 63); /* cylinders */
- }
- return 0;
-}
-
-MODULE_AUTHOR("Red Hat Software");
-
-static Scsi_Host_Template driver_template = I2OSCSI;
-
-#include "../scsi/scsi_module.c"
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)