/*
* 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.
*
* For the avoidance of doubt the "preferred form" of this code is one which
* is in an open non patent encumbered format. Where cryptographic key signing
* forms part of the process of creating an executable the information
* including keys needed to generate an equivalently functional executable
* are deemed to be part of the source code.
*
* 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/additions:
* Steve Ralston:
* Scatter gather now works
* Markus Lidel <Markus.Lidel@shadowconnect.com>:
* Minor fixes for 2.6.
*
* 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/jiffies.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/prefetch.h>
#include <linux/pci.h>
#include <asm/dma.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/atomic.h>
#include <linux/blkdev.h>
#include <linux/i2o.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#define VERSION_STRING "Version 0.1.2"
//#define DRIVERDEBUG
#ifdef DRIVERDEBUG
#define dprintk(s, args...) printk(s, ## args)
#else
#define dprintk(s, args...)
#endif
#define I2O_SCSI_CAN_QUEUE 4
#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 spinlock_t retry_lock = SPIN_LOCK_UNLOCKED;
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;
/**
* i2o_retry_run - retry on timeout
* @f: unused
*
* 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;
spin_lock_irqsave(&retry_lock, flags);
for(i=0;i<retry_ct;i++)
i2o_post_message(retry_ctrl[i], virt_to_bus(retry[i]));
retry_ct=0;
spin_unlock_irqrestore(&retry_lock, flags);
}
/**
* flush_pending - empty the retry queue
*
* Turn each of the pending commands into a NOP and post it back
* to the controller to clear it.
*/
static void flush_pending(void)
{
int i;
unsigned long flags;
spin_lock_irqsave(&retry_lock, flags);
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;
spin_unlock_irqrestore(&retry_lock, flags);
}
/**
* i2o_scsi_reply - scsi message reply processor
* @h: our i2o handler
* @c: controller issuing the reply
* @msg: the message from the controller (mapped)
*
* Process reply messages (interrupts in normal scsi controller think).
* We can get a variety of messages to process. The normal path is
* scsi command completions. We must also deal with IOP failures,
* the reply to a bus reset and the reply to a LUN query.
*
* Locks: the queue lock is taken to call the completion handler
*/
static void i2o_scsi_reply(struct i2o_handler *h, struct i2o_controller *c, struct i2o_message *msg)
{
struct scsi_cmnd *current_command;
spinlock_t *lock;
u32 *m = (u32 *)msg;
u8 as,ds,st;
unsigned long flags;
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);
/* This isnt a fast path .. */
spin_lock_irqsave(&retry_lock, flags);
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);
}
spin_unlock_irqrestore(&retry_lock, flags);
}
else
{
spin_unlock_irqrestore(&retry_lock, flags);
/* Create a scsi error for this */
current_command = (struct scsi_cmnd *)i2o_context_list_get(m[3], c);
if(!current_command)
return;
lock = current_command->device->host->host_lock;
printk("Aborted %ld\n", current_command->serial_number);
spin_lock_irqsave(lock, flags);
current_command->result = DID_ERROR << 16;
current_command->scsi_done(current_command);
spin_unlock_irqrestore(lock, flags);
/* 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;
}
prefetchw(&queue_depth);
/*
* Low byte is device status, next is adapter status,
* (then one byte reserved), then request status.
*/
ds=(u8)le32_to_cpu(m[4]);
as=(u8)le32_to_cpu(m[4]>>8);
st=(u8)le32_to_cpu(m[4]>>24);
dprintk(KERN_INFO "i2o got a scsi reply %08X: ", m[0]);
dprintk(KERN_INFO "m[2]=%08X: ", m[2]);
dprintk(KERN_INFO "m[4]=%08X\n", m[4]);
if(m[2]&0x80000000)
{
if(m[2]&0x40000000)
{
dprintk(KERN_INFO "Event.\n");
lun_done=1;
return;
}
printk(KERN_INFO "i2o_scsi: bus reset completed.\n");
return;
}
current_command = (struct scsi_cmnd *)i2o_context_list_get(m[3], c);
/*
* Is this a control request coming back - eg an abort ?
*/
atomic_dec(&queue_depth);
if(current_command==NULL)
{
if(st)
dprintk(KERN_WARNING "SCSI abort: %08X", m[4]);
dprintk(KERN_INFO "SCSI abort completed.\n");
return;
}
dprintk(KERN_INFO "Completed %ld\n", current_command->serial_number);
if(st == 0x06)
{
if(le32_to_cpu(m[5]) < current_command->underflow)
{
int i;
printk(KERN_ERR "SCSI: underflow 0x%08X 0x%08X\n",
le32_to_cpu(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_WARNING "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;
if (current_command->use_sg) {
pci_unmap_sg(c->pdev,
(struct scatterlist *)current_command->buffer,
current_command->use_sg,
current_command->sc_data_direction);
} else if (current_command->request_bufflen) {
pci_unmap_single(c->pdev,
(dma_addr_t)((long)current_command->SCp.ptr),
current_command->request_bufflen,
current_command->sc_data_direction);
}
lock = current_command->device->host->host_lock;
spin_lock_irqsave(lock, flags);
current_command->scsi_done(current_command);
spin_unlock_irqrestore(lock, flags);
return;
}
struct i2o_handler i2o_scsi_handler = {
.reply = i2o_scsi_reply,
.name = "I2O SCSI OSM",
.class = I2O_CLASS_SCSI_PERIPHERAL,
};
/**
* i2o_find_lun - report the lun of an i2o device
* @c: i2o controller owning the device
* @d: i2o disk device
* @target: filled in with target id
* @lun: filled in with target lun
*
* Query an I2O device to find out its SCSI lun and target numbering. We
* don't currently handle some of the fancy SCSI-3 stuff although our
* querying is sufficient to do so.
*/
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(KERN_INFO "SCSI (%d,%d)\n", *target, *lun);
return 0;
}
/**
* i2o_scsi_init - initialize an i2o device for scsi
* @c: i2o controller owning the device
* @d: scsi controller
* @shpnt: scsi device we wish it to become
*
* Enumerate the scsi peripheral/fibre channel peripheral class
* devices that are children of the controller. From that we build
* a translation map for the command queue code. Since I2O works on
* its own tid's we effectively have to think backwards to get what
* the midlayer wants
*/
static 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(KERN_INFO "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(KERN_INFO "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(KERN_INFO "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(KERN_INFO "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(KERN_INFO "i2o_scsi: set scatter-gather to %d.\n",
shpnt->sg_tablesize);
}
}
}
/**
* i2o_scsi_detect - probe for I2O scsi devices
* @tpnt: scsi layer template
*
* I2O is a little odd here. The I2O core already knows what the
* devices are. It also knows them by disk and tape as well as
* by controller. We register each I2O scsi class object as a
* scsi controller and then let the enumeration fake up the rest
*/
static int i2o_scsi_detect(struct scsi_host_template * tpnt)
{
struct Scsi_Host *shpnt = NULL;
int i;
int count;
printk(KERN_INFO "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(KERN_INFO "i2o_scsi: Unable to alloc %d byte SG chain buffer pool.\n", SG_CHAIN_POOL_SZ);
printk(KERN_INFO "i2o_scsi: SG chaining DISABLED!\n");
sg_max_frags = 11;
}
else
{
printk(KERN_INFO " chain_pool: %d bytes @ %p\n", SG_CHAIN_POOL_SZ, sg_chain_pool);
printk(KERN_INFO " (%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;
shpnt->unique_id = (u32)d;
shpnt->io_port = 0;
shpnt->n_io_port = 0;
shpnt->irq = 0;
shpnt->this_id = /* Good question */15;
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;
}
static 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);
}
scsi_unregister(host);
return 0;
}
static 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]);
}
/**
* i2o_scsi_queuecommand - queue a SCSI command
* @SCpnt: scsi command pointer
* @done: callback for completion
*
* Issue a scsi comamnd asynchronously. Return 0 on success or 1 if
* we hit an error (normally message queue congestion). The only
* minor complication here is that I2O deals with the device addressing
* so we have to map the bus/dev/lun back to an I2O handle as well
* as faking absent devices ourself.
*
* Locks: takes the controller lock on error path only
*/
static int i2o_scsi_queuecommand(struct scsi_cmnd *SCpnt,
void (*done) (struct scsi_cmnd *))
{
int i;
int tid;
struct i2o_controller *c;
struct 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;
unsigned long flags;
static int max_qd = 1;
/*
* Do the incoming paperwork
*/
host = SCpnt->device->host;
hostdata = (struct i2o_scsi_host *)host->hostdata;
c = hostdata->controller;
prefetch(c);
prefetchw(&queue_depth);
SCpnt->scsi_done = done;
if(SCpnt->device->id > 15)
{
printk(KERN_ERR "i2o_scsi: Wild target %d.\n", SCpnt->device->id);
return -1;
}
tid = hostdata->task[SCpnt->device->id][SCpnt->device->lun];
dprintk(KERN_INFO "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(KERN_INFO "Real scsi messages.\n");
/*
* Obtain an I2O message. If there are none free then
* throw it back to the scsi layer
*/
m = le32_to_cpu(I2O_POST_READ32(c));
if(m==0xFFFFFFFF)
return 1;
msg = (u32 *)(c->msg_virt + m);
/*
* Put together a scsi execscb message
*/
len = SCpnt->request_bufflen;
direction = 0x00000000; // SGL IN (osm<--iop)
if (SCpnt->sc_data_direction == DMA_NONE) {
scsidir = 0x00000000; // DATA NO XFER
} else if (SCpnt->sc_data_direction == DMA_TO_DEVICE) {
direction = 0x04000000; // SGL OUT (osm-->iop)
scsidir = 0x80000000; // DATA OUT (iop-->dev)
} else if(SCpnt->sc_data_direction == DMA_FROM_DEVICE) {
scsidir = 0x40000000; // DATA IN (iop<--dev)
} else {
/* Unknown - kill the command */
SCpnt->result = DID_NO_CONNECT << 16;
/* We must lock the request queue while completing */
spin_lock_irqsave(host->host_lock, flags);
done(SCpnt);
spin_unlock_irqrestore(host->host_lock, flags);
return 0;
}
i2o_raw_writel(I2O_CMD_SCSI_EXEC<<24|HOST_TID<<12|tid, &msg[1]);
i2o_raw_writel(scsi_context, &msg[2]); /* So the I2O layer passes to us */
i2o_raw_writel(i2o_context_list_add(SCpnt, c), &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->device->id][SCpnt->device->lun]) > (5*HZ))
{
tag=0x01800000; /* ORDERED! */
hostdata->tagclock[SCpnt->device->id][SCpnt->device->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 */
i2o_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 sg_count;
int chain = 0;
len = 0;
sg_count = pci_map_sg(c->pdev, sg, SCpnt->use_sg,
SCpnt->sc_data_direction);
/* FIXME: handle fail */
if(!sg_count)
BUG();
if((sg_max_frags > 11) && (SCpnt->use_sg > 11))
{
chain = 1;
/*
* Need to chain!
*/
i2o_raw_writel(direction|0xB0000000|(SCpnt->use_sg*2*4), mptr++);
i2o_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++=cpu_to_le32(direction|0x10000000|sg_dma_len(sg));
len+=sg_dma_len(sg);
*mptr++=cpu_to_le32(sg_dma_address(sg));
sg++;
}
mptr[-2]=cpu_to_le32(direction|0xD0000000|sg_dma_len(sg-1));
}
else
{
for(i = 0 ; i < SCpnt->use_sg; i++)
{
i2o_raw_writel(direction|0x10000000|sg_dma_len(sg), mptr++);
len+=sg->length;
i2o_raw_writel(sg_dma_address(sg), mptr++);
sg++;
}
/* Make this an end of list. Again evade the 920 bug and
unwanted PCI read traffic */
i2o_raw_writel(direction|0xD0000000|sg_dma_len(sg-1), &mptr[-2]);
}
if(!chain)
reqlen = mptr - msg;
i2o_raw_writel(len, lenptr);
if(len != SCpnt->underflow)
printk("Cmd len %08X Cmd underflow %08X\n",
len, SCpnt->underflow);
}
else
{
dprintk(KERN_INFO "non sg for %p, %d\n", SCpnt->request_buffer,
SCpnt->request_bufflen);
i2o_raw_writel(len = SCpnt->request_bufflen, lenptr);
if(len == 0)
{
reqlen = 9;
}
else
{
dma_addr_t dma_addr;
dma_addr = pci_map_single(c->pdev,
SCpnt->request_buffer,
SCpnt->request_bufflen,
SCpnt->sc_data_direction);
if(dma_addr == 0)
BUG(); /* How to handle ?? */
SCpnt->SCp.ptr = (char *)(unsigned long) dma_addr;
i2o_raw_writel(0xD0000000|direction|SCpnt->request_bufflen, mptr++);
i2o_raw_writel(dma_addr, mptr++);
}
}
/*
* Stick the headers on
*/
i2o_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(KERN_INFO "Issued %ld\n", current_command->serial_number);
return 0;
}
/**
* i2o_scsi_abort - abort a running command
* @SCpnt: command to abort
*
* Ask the I2O controller to abort a command. This is an asynchrnous
* process and our callback handler will see the command complete
* with an aborted message if it succeeds.
*
* Locks: no locks are held or needed
*/
static int i2o_scsi_abort(struct scsi_cmnd * SCpnt)
{
struct i2o_controller *c;
struct Scsi_Host *host;
struct i2o_scsi_host *hostdata;
u32 msg[5];
int tid;
int status = FAILED;
printk(KERN_WARNING "i2o_scsi: Aborting command block.\n");
host = SCpnt->device->host;
hostdata = (struct i2o_scsi_host *)host->hostdata;
tid = hostdata->task[SCpnt->device->id][SCpnt->device->lun];
if(tid==-1)
{
printk(KERN_ERR "i2o_scsi: Impossible command to abort!\n");
return status;
}
c = hostdata->controller;
spin_unlock_irq(host->host_lock);
msg[0] = FIVE_WORD_MSG_SIZE;
msg[1] = I2O_CMD_SCSI_ABORT<<24|HOST_TID<<12|tid;
msg[2] = scsi_context;
msg[3] = 0;
msg[4] = i2o_context_list_remove(SCpnt, c);
if(i2o_post_wait(c, msg, sizeof(msg), 240))
status = SUCCESS;
spin_lock_irq(host->host_lock);
return status;
}
/**
* i2o_scsi_bus_reset - Issue a SCSI reset
* @SCpnt: the command that caused the reset
*
* Perform a SCSI bus reset operation. In I2O this is just a message
* we pass. I2O can do clever multi-initiator and shared reset stuff
* but we don't support this.
*
* Locks: called with no lock held, requires no locks.
*/
static int i2o_scsi_bus_reset(struct scsi_cmnd * SCpnt)
{
int tid;
struct i2o_controller *c;
struct Scsi_Host *host;
struct i2o_scsi_host *hostdata;
u32 m;
void *msg;
unsigned long timeout;
/*
* Find the TID for the bus
*/
host = SCpnt->device->host;
spin_unlock_irq(host->host_lock);
printk(KERN_WARNING "i2o_scsi: Attempting to reset the bus.\n");
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 ?
*/
timeout = jiffies+2*HZ;
do
{
m = le32_to_cpu(I2O_POST_READ32(c));
if(m != 0xFFFFFFFF)
break;
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(1);
mb();
}
while(time_before(jiffies, timeout));
msg = c->msg_virt + m;
i2o_raw_writel(FOUR_WORD_MSG_SIZE|SGL_OFFSET_0, msg);
i2o_raw_writel(I2O_CMD_SCSI_BUSRESET<<24|HOST_TID<<12|tid, msg+4);
i2o_raw_writel(scsi_context|0x80000000, msg+8);
/* 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+12);
wmb();
/* We want the command to complete after we return */
spin_lock_irq(host->host_lock);
i2o_post_message(c,m);
/* Should we wait for the reset to complete ? */
return SUCCESS;
}
/**
* i2o_scsi_bios_param - Invent disk geometry
* @sdev: scsi device
* @dev: block layer device
* @capacity: size in sectors
* @ip: geometry array
*
* This is anyones guess quite frankly. We use the same rules everyone
* else appears to and hope. It seems to work.
*/
static int i2o_scsi_bios_param(struct scsi_device * sdev,
struct block_device *dev, sector_t capacity, int *ip)
{
int size;
size = 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");
MODULE_LICENSE("GPL");
static struct scsi_host_template driver_template = {
.proc_name = "i2o_scsi",
.name = "I2O SCSI Layer",
.detect = i2o_scsi_detect,
.release = i2o_scsi_release,
.info = i2o_scsi_info,
.queuecommand = i2o_scsi_queuecommand,
.eh_abort_handler = i2o_scsi_abort,
.eh_bus_reset_handler = i2o_scsi_bus_reset,
.bios_param = i2o_scsi_bios_param,
.can_queue = I2O_SCSI_CAN_QUEUE,
.this_id = 15,
.sg_tablesize = 8,
.cmd_per_lun = 6,
.use_clustering = ENABLE_CLUSTERING,
};
#include "../../scsi/scsi_module.c"
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