cciss_scsi.c 48.1 KB
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/*
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 *    Disk Array driver for HP Smart Array controllers, SCSI Tape module.
 *    (C) Copyright 2001, 2007 Hewlett-Packard Development Company, L.P.
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 *
 *    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
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 *    the Free Software Foundation; version 2 of the License.
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 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *    MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *    General Public License for more details.
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 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
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 *    Foundation, Inc., 59 Temple Place, Suite 300, Boston, MA
 *    02111-1307, USA.
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 *
 *    Questions/Comments/Bugfixes to iss_storagedev@hp.com
 *    
 *    Author: Stephen M. Cameron
 */
#ifdef CONFIG_CISS_SCSI_TAPE

/* Here we have code to present the driver as a scsi driver 
   as it is simultaneously presented as a block driver.  The 
   reason for doing this is to allow access to SCSI tape drives
   through the array controller.  Note in particular, neither 
   physical nor logical disks are presented through the scsi layer. */

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#include <linux/timer.h>
#include <linux/completion.h>
#include <linux/slab.h>
#include <linux/string.h>

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#include <linux/atomic.h>
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#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h> 

#include "cciss_scsi.h"

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#define CCISS_ABORT_MSG 0x00
#define CCISS_RESET_MSG 0x01

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static int fill_cmd(ctlr_info_t *h, CommandList_struct *c, __u8 cmd, void *buff,
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	size_t size,
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	__u8 page_code, unsigned char *scsi3addr,
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	int cmd_type);

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static CommandList_struct *cmd_alloc(ctlr_info_t *h);
static CommandList_struct *cmd_special_alloc(ctlr_info_t *h);
static void cmd_free(ctlr_info_t *h, CommandList_struct *c);
static void cmd_special_free(ctlr_info_t *h, CommandList_struct *c);
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static int cciss_scsi_proc_info(
		struct Scsi_Host *sh,
		char *buffer, /* data buffer */
		char **start, 	   /* where data in buffer starts */
		off_t offset,	   /* offset from start of imaginary file */
		int length, 	   /* length of data in buffer */
		int func);	   /* 0 == read, 1 == write */

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static int cciss_scsi_queue_command (struct Scsi_Host *h,
				     struct scsi_cmnd *cmd);
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static int cciss_eh_device_reset_handler(struct scsi_cmnd *);
static int cciss_eh_abort_handler(struct scsi_cmnd *);
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static struct cciss_scsi_hba_t ccissscsi[MAX_CTLR] = {
	{ .name = "cciss0", .ndevices = 0 },
	{ .name = "cciss1", .ndevices = 0 },
	{ .name = "cciss2", .ndevices = 0 },
	{ .name = "cciss3", .ndevices = 0 },
	{ .name = "cciss4", .ndevices = 0 },
	{ .name = "cciss5", .ndevices = 0 },
	{ .name = "cciss6", .ndevices = 0 },
	{ .name = "cciss7", .ndevices = 0 },
};

static struct scsi_host_template cciss_driver_template = {
	.module			= THIS_MODULE,
	.name			= "cciss",
	.proc_name		= "cciss",
	.proc_info		= cciss_scsi_proc_info,
	.queuecommand		= cciss_scsi_queue_command,
	.this_id		= 7,
	.cmd_per_lun		= 1,
	.use_clustering		= DISABLE_CLUSTERING,
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	/* Can't have eh_bus_reset_handler or eh_host_reset_handler for cciss */
	.eh_device_reset_handler= cciss_eh_device_reset_handler,
	.eh_abort_handler	= cciss_eh_abort_handler,
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};

#pragma pack(1)
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#define SCSI_PAD_32 8
#define SCSI_PAD_64 8
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struct cciss_scsi_cmd_stack_elem_t {
	CommandList_struct cmd;
	ErrorInfo_struct Err;
	__u32 busaddr;
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	int cmdindex;
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	u8 pad[IS_32_BIT * SCSI_PAD_32 + IS_64_BIT * SCSI_PAD_64];
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};

#pragma pack()

#pragma pack(1)
struct cciss_scsi_cmd_stack_t {
	struct cciss_scsi_cmd_stack_elem_t *pool;
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	struct cciss_scsi_cmd_stack_elem_t **elem;
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	dma_addr_t cmd_pool_handle;
	int top;
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	int nelems;
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};
#pragma pack()

struct cciss_scsi_adapter_data_t {
	struct Scsi_Host *scsi_host;
	struct cciss_scsi_cmd_stack_t cmd_stack;
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	SGDescriptor_struct **cmd_sg_list;
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	int registered;
	spinlock_t lock; // to protect ccissscsi[ctlr]; 
};

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#define CPQ_TAPE_LOCK(h, flags) spin_lock_irqsave( \
	&h->scsi_ctlr->lock, flags);
#define CPQ_TAPE_UNLOCK(h, flags) spin_unlock_irqrestore( \
	&h->scsi_ctlr->lock, flags);
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static CommandList_struct *
scsi_cmd_alloc(ctlr_info_t *h)
{
	/* assume only one process in here at a time, locking done by caller. */
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	/* use h->lock */
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	/* might be better to rewrite how we allocate scsi commands in a way that */
	/* needs no locking at all. */

	/* take the top memory chunk off the stack and return it, if any. */
	struct cciss_scsi_cmd_stack_elem_t *c;
	struct cciss_scsi_adapter_data_t *sa;
	struct cciss_scsi_cmd_stack_t *stk;
	u64bit temp64;

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	sa = h->scsi_ctlr;
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	stk = &sa->cmd_stack; 

	if (stk->top < 0) 
		return NULL;
	c = stk->elem[stk->top]; 	
	/* memset(c, 0, sizeof(*c)); */
	memset(&c->cmd, 0, sizeof(c->cmd));
	memset(&c->Err, 0, sizeof(c->Err));
	/* set physical addr of cmd and addr of scsi parameters */
	c->cmd.busaddr = c->busaddr; 
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	c->cmd.cmdindex = c->cmdindex;
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	/* (__u32) (stk->cmd_pool_handle + 
		(sizeof(struct cciss_scsi_cmd_stack_elem_t)*stk->top)); */

	temp64.val = (__u64) (c->busaddr + sizeof(CommandList_struct));
	/* (__u64) (stk->cmd_pool_handle + 
		(sizeof(struct cciss_scsi_cmd_stack_elem_t)*stk->top) +
		 sizeof(CommandList_struct)); */
	stk->top--;
	c->cmd.ErrDesc.Addr.lower = temp64.val32.lower;
	c->cmd.ErrDesc.Addr.upper = temp64.val32.upper;
	c->cmd.ErrDesc.Len = sizeof(ErrorInfo_struct);
	
	c->cmd.ctlr = h->ctlr;
	c->cmd.err_info = &c->Err;

	return (CommandList_struct *) c;
}

static void 
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scsi_cmd_free(ctlr_info_t *h, CommandList_struct *c)
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{
	/* assume only one process in here at a time, locking done by caller. */
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	/* use h->lock */
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	/* drop the free memory chunk on top of the stack. */

	struct cciss_scsi_adapter_data_t *sa;
	struct cciss_scsi_cmd_stack_t *stk;

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	sa = h->scsi_ctlr;
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	stk = &sa->cmd_stack; 
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	stk->top++;
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	if (stk->top >= stk->nelems) {
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		dev_err(&h->pdev->dev,
			"scsi_cmd_free called too many times.\n");
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		BUG();
	}
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	stk->elem[stk->top] = (struct cciss_scsi_cmd_stack_elem_t *) c;
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}

static int
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scsi_cmd_stack_setup(ctlr_info_t *h, struct cciss_scsi_adapter_data_t *sa)
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{
	int i;
	struct cciss_scsi_cmd_stack_t *stk;
	size_t size;

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	stk = &sa->cmd_stack;
	stk->nelems = cciss_tape_cmds + 2;
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	sa->cmd_sg_list = cciss_allocate_sg_chain_blocks(h,
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		h->chainsize, stk->nelems);
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	if (!sa->cmd_sg_list && h->chainsize > 0)
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		return -ENOMEM;

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	size = sizeof(struct cciss_scsi_cmd_stack_elem_t) * stk->nelems;
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	/* Check alignment, see cciss_cmd.h near CommandList_struct def. */
	BUILD_BUG_ON((sizeof(*stk->pool) % COMMANDLIST_ALIGNMENT) != 0);
	/* pci_alloc_consistent guarantees 32-bit DMA address will be used */
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	stk->pool = (struct cciss_scsi_cmd_stack_elem_t *)
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		pci_alloc_consistent(h->pdev, size, &stk->cmd_pool_handle);
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	if (stk->pool == NULL) {
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		cciss_free_sg_chain_blocks(sa->cmd_sg_list, stk->nelems);
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		sa->cmd_sg_list = NULL;
		return -ENOMEM;
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	}
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	stk->elem = kmalloc(sizeof(stk->elem[0]) * stk->nelems, GFP_KERNEL);
	if (!stk->elem) {
		pci_free_consistent(h->pdev, size, stk->pool,
		stk->cmd_pool_handle);
		return -1;
	}
	for (i = 0; i < stk->nelems; i++) {
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		stk->elem[i] = &stk->pool[i];
		stk->elem[i]->busaddr = (__u32) (stk->cmd_pool_handle + 
			(sizeof(struct cciss_scsi_cmd_stack_elem_t) * i));
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		stk->elem[i]->cmdindex = i;
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	}
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	stk->top = stk->nelems-1;
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	return 0;
}

static void
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scsi_cmd_stack_free(ctlr_info_t *h)
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{
	struct cciss_scsi_adapter_data_t *sa;
	struct cciss_scsi_cmd_stack_t *stk;
	size_t size;

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	sa = h->scsi_ctlr;
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	stk = &sa->cmd_stack; 
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	if (stk->top != stk->nelems-1) {
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		dev_warn(&h->pdev->dev,
			"bug: %d scsi commands are still outstanding.\n",
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			stk->nelems - stk->top);
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	}
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	size = sizeof(struct cciss_scsi_cmd_stack_elem_t) * stk->nelems;
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	pci_free_consistent(h->pdev, size, stk->pool, stk->cmd_pool_handle);
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	stk->pool = NULL;
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	cciss_free_sg_chain_blocks(sa->cmd_sg_list, stk->nelems);
	kfree(stk->elem);
	stk->elem = NULL;
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}

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#if 0
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static int xmargin=8;
static int amargin=60;

static void
print_bytes (unsigned char *c, int len, int hex, int ascii)
{

	int i;
	unsigned char *x;

	if (hex)
	{
		x = c;
		for (i=0;i<len;i++)
		{
			if ((i % xmargin) == 0 && i>0) printk("\n");
			if ((i % xmargin) == 0) printk("0x%04x:", i);
			printk(" %02x", *x);
			x++;
		}
		printk("\n");
	}
	if (ascii)
	{
		x = c;
		for (i=0;i<len;i++)
		{
			if ((i % amargin) == 0 && i>0) printk("\n");
			if ((i % amargin) == 0) printk("0x%04x:", i);
			if (*x > 26 && *x < 128) printk("%c", *x);
			else printk(".");
			x++;
		}
		printk("\n");
	}
}

static void
print_cmd(CommandList_struct *cp)
{
	printk("queue:%d\n", cp->Header.ReplyQueue);
	printk("sglist:%d\n", cp->Header.SGList);
	printk("sgtot:%d\n", cp->Header.SGTotal);
	printk("Tag:0x%08x/0x%08x\n", cp->Header.Tag.upper, 
			cp->Header.Tag.lower);
	printk("LUN:0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
		cp->Header.LUN.LunAddrBytes[0],
		cp->Header.LUN.LunAddrBytes[1],
		cp->Header.LUN.LunAddrBytes[2],
		cp->Header.LUN.LunAddrBytes[3],
		cp->Header.LUN.LunAddrBytes[4],
		cp->Header.LUN.LunAddrBytes[5],
		cp->Header.LUN.LunAddrBytes[6],
		cp->Header.LUN.LunAddrBytes[7]);
	printk("CDBLen:%d\n", cp->Request.CDBLen);
	printk("Type:%d\n",cp->Request.Type.Type);
	printk("Attr:%d\n",cp->Request.Type.Attribute);
	printk(" Dir:%d\n",cp->Request.Type.Direction);
	printk("Timeout:%d\n",cp->Request.Timeout);
	printk( "CDB: %02x %02x %02x %02x %02x %02x %02x %02x"
		" %02x %02x %02x %02x %02x %02x %02x %02x\n",
		cp->Request.CDB[0], cp->Request.CDB[1],
		cp->Request.CDB[2], cp->Request.CDB[3],
		cp->Request.CDB[4], cp->Request.CDB[5],
		cp->Request.CDB[6], cp->Request.CDB[7],
		cp->Request.CDB[8], cp->Request.CDB[9],
		cp->Request.CDB[10], cp->Request.CDB[11],
		cp->Request.CDB[12], cp->Request.CDB[13],
		cp->Request.CDB[14], cp->Request.CDB[15]),
	printk("edesc.Addr: 0x%08x/0%08x, Len  = %d\n", 
		cp->ErrDesc.Addr.upper, cp->ErrDesc.Addr.lower, 
			cp->ErrDesc.Len);
	printk("sgs..........Errorinfo:\n");
	printk("scsistatus:%d\n", cp->err_info->ScsiStatus);
	printk("senselen:%d\n", cp->err_info->SenseLen);
	printk("cmd status:%d\n", cp->err_info->CommandStatus);
	printk("resid cnt:%d\n", cp->err_info->ResidualCnt);
	printk("offense size:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_size);
	printk("offense byte:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_num);
	printk("offense value:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_value);
			
}

#endif

static int 
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find_bus_target_lun(ctlr_info_t *h, int *bus, int *target, int *lun)
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{
	/* finds an unused bus, target, lun for a new device */
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	/* assumes h->scsi_ctlr->lock is held */
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	int i, found=0;
	unsigned char target_taken[CCISS_MAX_SCSI_DEVS_PER_HBA];

	memset(&target_taken[0], 0, CCISS_MAX_SCSI_DEVS_PER_HBA);

	target_taken[SELF_SCSI_ID] = 1;	
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	for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++)
		target_taken[ccissscsi[h->ctlr].dev[i].target] = 1;
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	for (i = 0; i < CCISS_MAX_SCSI_DEVS_PER_HBA; i++) {
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		if (!target_taken[i]) {
			*bus = 0; *target=i; *lun = 0; found=1;
			break;
		}
	}
	return (!found);	
}
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struct scsi2map {
	char scsi3addr[8];
	int bus, target, lun;
};
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static int 
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cciss_scsi_add_entry(ctlr_info_t *h, int hostno,
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		struct cciss_scsi_dev_t *device,
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		struct scsi2map *added, int *nadded)
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{
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	/* assumes h->scsi_ctlr->lock is held */
	int n = ccissscsi[h->ctlr].ndevices;
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	struct cciss_scsi_dev_t *sd;
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	int i, bus, target, lun;
	unsigned char addr1[8], addr2[8];
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	if (n >= CCISS_MAX_SCSI_DEVS_PER_HBA) {
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		dev_warn(&h->pdev->dev, "Too many devices, "
			"some will be inaccessible.\n");
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		return -1;
	}
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	bus = target = -1;
	lun = 0;
	/* Is this device a non-zero lun of a multi-lun device */
	/* byte 4 of the 8-byte LUN addr will contain the logical unit no. */
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	if (device->scsi3addr[4] != 0) {
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		/* Search through our list and find the device which */
		/* has the same 8 byte LUN address, excepting byte 4. */
		/* Assign the same bus and target for this new LUN. */
		/* Use the logical unit number from the firmware. */
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		memcpy(addr1, device->scsi3addr, 8);
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		addr1[4] = 0;
		for (i = 0; i < n; i++) {
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			sd = &ccissscsi[h->ctlr].dev[i];
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			memcpy(addr2, sd->scsi3addr, 8);
			addr2[4] = 0;
			/* differ only in byte 4? */
			if (memcmp(addr1, addr2, 8) == 0) {
				bus = sd->bus;
				target = sd->target;
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				lun = device->scsi3addr[4];
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				break;
			}
		}
	}

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	sd = &ccissscsi[h->ctlr].dev[n];
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	if (lun == 0) {
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		if (find_bus_target_lun(h,
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			&sd->bus, &sd->target, &sd->lun) != 0)
			return -1;
	} else {
		sd->bus = bus;
		sd->target = target;
		sd->lun = lun;
	}
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	added[*nadded].bus = sd->bus;
	added[*nadded].target = sd->target;
	added[*nadded].lun = sd->lun;
	(*nadded)++;

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	memcpy(sd->scsi3addr, device->scsi3addr, 8);
	memcpy(sd->vendor, device->vendor, sizeof(sd->vendor));
	memcpy(sd->revision, device->revision, sizeof(sd->revision));
	memcpy(sd->device_id, device->device_id, sizeof(sd->device_id));
	sd->devtype = device->devtype;

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	ccissscsi[h->ctlr].ndevices++;
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	/* initially, (before registering with scsi layer) we don't 
	   know our hostno and we don't want to print anything first 
	   time anyway (the scsi layer's inquiries will show that info) */
	if (hostno != -1)
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		dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d added.\n",
			scsi_device_type(sd->devtype), hostno,
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			sd->bus, sd->target, sd->lun);
	return 0;
}

static void
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cciss_scsi_remove_entry(ctlr_info_t *h, int hostno, int entry,
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	struct scsi2map *removed, int *nremoved)
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{
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	/* assumes h->ctlr]->scsi_ctlr->lock is held */
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	int i;
	struct cciss_scsi_dev_t sd;

	if (entry < 0 || entry >= CCISS_MAX_SCSI_DEVS_PER_HBA) return;
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	sd = ccissscsi[h->ctlr].dev[entry];
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	removed[*nremoved].bus    = sd.bus;
	removed[*nremoved].target = sd.target;
	removed[*nremoved].lun    = sd.lun;
	(*nremoved)++;
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	for (i = entry; i < ccissscsi[h->ctlr].ndevices-1; i++)
		ccissscsi[h->ctlr].dev[i] = ccissscsi[h->ctlr].dev[i+1];
	ccissscsi[h->ctlr].ndevices--;
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	dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d removed.\n",
		scsi_device_type(sd.devtype), hostno,
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			sd.bus, sd.target, sd.lun);
}


#define SCSI3ADDR_EQ(a,b) ( \
	(a)[7] == (b)[7] && \
	(a)[6] == (b)[6] && \
	(a)[5] == (b)[5] && \
	(a)[4] == (b)[4] && \
	(a)[3] == (b)[3] && \
	(a)[2] == (b)[2] && \
	(a)[1] == (b)[1] && \
	(a)[0] == (b)[0])

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static void fixup_botched_add(ctlr_info_t *h, char *scsi3addr)
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{
	/* called when scsi_add_device fails in order to re-adjust */
	/* ccissscsi[] to match the mid layer's view. */
	unsigned long flags;
	int i, j;
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	CPQ_TAPE_LOCK(h, flags);
	for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++) {
493
		if (memcmp(scsi3addr,
494 495 496 497 498
				ccissscsi[h->ctlr].dev[i].scsi3addr, 8) == 0) {
			for (j = i; j < ccissscsi[h->ctlr].ndevices-1; j++)
				ccissscsi[h->ctlr].dev[j] =
					ccissscsi[h->ctlr].dev[j+1];
			ccissscsi[h->ctlr].ndevices--;
499 500 501
			break;
		}
	}
502
	CPQ_TAPE_UNLOCK(h, flags);
503 504
}

505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520
static int device_is_the_same(struct cciss_scsi_dev_t *dev1,
	struct cciss_scsi_dev_t *dev2)
{
	return dev1->devtype == dev2->devtype &&
		memcmp(dev1->scsi3addr, dev2->scsi3addr,
			sizeof(dev1->scsi3addr)) == 0 &&
		memcmp(dev1->device_id, dev2->device_id,
			sizeof(dev1->device_id)) == 0 &&
		memcmp(dev1->vendor, dev2->vendor,
			sizeof(dev1->vendor)) == 0 &&
		memcmp(dev1->model, dev2->model,
			sizeof(dev1->model)) == 0 &&
		memcmp(dev1->revision, dev2->revision,
			sizeof(dev1->revision)) == 0;
}

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static int
522
adjust_cciss_scsi_table(ctlr_info_t *h, int hostno,
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	struct cciss_scsi_dev_t sd[], int nsds)
{
	/* sd contains scsi3 addresses and devtypes, but
	   bus target and lun are not filled in.  This funciton
	   takes what's in sd to be the current and adjusts
	   ccissscsi[] to be in line with what's in sd. */ 

	int i,j, found, changes=0;
	struct cciss_scsi_dev_t *csd;
	unsigned long flags;
533 534 535 536 537 538 539 540 541 542
	struct scsi2map *added, *removed;
	int nadded, nremoved;
	struct Scsi_Host *sh = NULL;

	added = kzalloc(sizeof(*added) * CCISS_MAX_SCSI_DEVS_PER_HBA,
			GFP_KERNEL);
	removed = kzalloc(sizeof(*removed) * CCISS_MAX_SCSI_DEVS_PER_HBA,
			GFP_KERNEL);

	if (!added || !removed) {
543 544
		dev_warn(&h->pdev->dev,
			"Out of memory in adjust_cciss_scsi_table\n");
545 546
		goto free_and_out;
	}
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548
	CPQ_TAPE_LOCK(h, flags);
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550
	if (hostno != -1)  /* if it's not the first time... */
551
		sh = h->scsi_ctlr->scsi_host;
552

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	/* find any devices in ccissscsi[] that are not in 
	   sd[] and remove them from ccissscsi[] */

	i = 0;
557 558
	nremoved = 0;
	nadded = 0;
559 560
	while (i < ccissscsi[h->ctlr].ndevices) {
		csd = &ccissscsi[h->ctlr].dev[i];
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		found=0;
		for (j=0;j<nsds;j++) {
			if (SCSI3ADDR_EQ(sd[j].scsi3addr,
				csd->scsi3addr)) {
565
				if (device_is_the_same(&sd[j], csd))
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					found=2;
				else
					found=1;
				break;
			}
		}

		if (found == 0) { /* device no longer present. */ 
			changes++;
575
			cciss_scsi_remove_entry(h, hostno, i,
576 577
				removed, &nremoved);
			/* remove ^^^, hence i not incremented */
578
		} else if (found == 1) { /* device is different in some way */
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			changes++;
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			dev_info(&h->pdev->dev,
				"device c%db%dt%dl%d has changed.\n",
				hostno, csd->bus, csd->target, csd->lun);
583
			cciss_scsi_remove_entry(h, hostno, i,
584 585
				removed, &nremoved);
			/* remove ^^^, hence i not incremented */
586
			if (cciss_scsi_add_entry(h, hostno, &sd[j],
587 588 589
				added, &nadded) != 0)
				/* we just removed one, so add can't fail. */
					BUG();
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			csd->devtype = sd[j].devtype;
591 592 593 594 595 596 597 598
			memcpy(csd->device_id, sd[j].device_id,
				sizeof(csd->device_id));
			memcpy(csd->vendor, sd[j].vendor,
				sizeof(csd->vendor));
			memcpy(csd->model, sd[j].model,
				sizeof(csd->model));
			memcpy(csd->revision, sd[j].revision,
				sizeof(csd->revision));
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		} else 		/* device is same as it ever was, */
			i++;	/* so just move along. */
	}

	/* Now, make sure every device listed in sd[] is also
 	   listed in ccissscsi[], adding them if they aren't found */

	for (i=0;i<nsds;i++) {
		found=0;
608 609
		for (j = 0; j < ccissscsi[h->ctlr].ndevices; j++) {
			csd = &ccissscsi[h->ctlr].dev[j];
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			if (SCSI3ADDR_EQ(sd[i].scsi3addr,
				csd->scsi3addr)) {
612
				if (device_is_the_same(&sd[i], csd))
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					found=2;	/* found device */
				else
					found=1; 	/* found a bug. */
				break;
			}
		}
		if (!found) {
			changes++;
621
			if (cciss_scsi_add_entry(h, hostno, &sd[i],
622
				added, &nadded) != 0)
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				break;
		} else if (found == 1) {
			/* should never happen... */
			changes++;
627 628
			dev_warn(&h->pdev->dev,
				"device unexpectedly changed\n");
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			/* but if it does happen, we just ignore that device */
		}
	}
632
	CPQ_TAPE_UNLOCK(h, flags);
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634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651
	/* Don't notify scsi mid layer of any changes the first time through */
	/* (or if there are no changes) scsi_scan_host will do it later the */
	/* first time through. */
	if (hostno == -1 || !changes)
		goto free_and_out;

	/* Notify scsi mid layer of any removed devices */
	for (i = 0; i < nremoved; i++) {
		struct scsi_device *sdev =
			scsi_device_lookup(sh, removed[i].bus,
				removed[i].target, removed[i].lun);
		if (sdev != NULL) {
			scsi_remove_device(sdev);
			scsi_device_put(sdev);
		} else {
			/* We don't expect to get here. */
			/* future cmds to this device will get selection */
			/* timeout as if the device was gone. */
652
			dev_warn(&h->pdev->dev, "didn't find "
653
				"c%db%dt%dl%d\n for removal.",
654
				hostno, removed[i].bus,
655 656 657 658 659 660 661 662 663 664 665
				removed[i].target, removed[i].lun);
		}
	}

	/* Notify scsi mid layer of any added devices */
	for (i = 0; i < nadded; i++) {
		int rc;
		rc = scsi_add_device(sh, added[i].bus,
			added[i].target, added[i].lun);
		if (rc == 0)
			continue;
666
		dev_warn(&h->pdev->dev, "scsi_add_device "
667
			"c%db%dt%dl%d failed, device not added.\n",
668
			hostno, added[i].bus, added[i].target, added[i].lun);
669 670
		/* now we have to remove it from ccissscsi, */
		/* since it didn't get added to scsi mid layer */
671
		fixup_botched_add(h, added[i].scsi3addr);
672
	}
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674 675 676
free_and_out:
	kfree(added);
	kfree(removed);
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	return 0;
}

static int
681
lookup_scsi3addr(ctlr_info_t *h, int bus, int target, int lun, char *scsi3addr)
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{
	int i;
	struct cciss_scsi_dev_t *sd;
	unsigned long flags;

687 688 689
	CPQ_TAPE_LOCK(h, flags);
	for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++) {
		sd = &ccissscsi[h->ctlr].dev[i];
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		if (sd->bus == bus &&
		    sd->target == target &&
		    sd->lun == lun) {
			memcpy(scsi3addr, &sd->scsi3addr[0], 8);
694
			CPQ_TAPE_UNLOCK(h, flags);
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			return 0;
		}
	}
698
	CPQ_TAPE_UNLOCK(h, flags);
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	return -1;
}

static void 
703
cciss_scsi_setup(ctlr_info_t *h)
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{
	struct cciss_scsi_adapter_data_t * shba;

707
	ccissscsi[h->ctlr].ndevices = 0;
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	shba = (struct cciss_scsi_adapter_data_t *)
		kmalloc(sizeof(*shba), GFP_KERNEL);	
	if (shba == NULL)
		return;
	shba->scsi_host = NULL;
	spin_lock_init(&shba->lock);
	shba->registered = 0;
715
	if (scsi_cmd_stack_setup(h, shba) != 0) {
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		kfree(shba);
		shba = NULL;
	}
719
	h->scsi_ctlr = shba;
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	return;
}

723 724
static void complete_scsi_command(CommandList_struct *c, int timeout,
	__u32 tag)
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{
	struct scsi_cmnd *cmd;
727
	ctlr_info_t *h;
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	ErrorInfo_struct *ei;

730
	ei = c->err_info;
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	/* First, see if it was a message rather than a command */
733 734
	if (c->Request.Type.Type == TYPE_MSG)  {
		c->cmd_type = CMD_MSG_DONE;
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		return;
	}

738 739
	cmd = (struct scsi_cmnd *) c->scsi_cmd;
	h = hba[c->ctlr];
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741
	scsi_dma_unmap(cmd);
742 743
	if (c->Header.SGTotal > h->max_cmd_sgentries)
		cciss_unmap_sg_chain_block(h, c);
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	cmd->result = (DID_OK << 16); 		/* host byte */
	cmd->result |= (COMMAND_COMPLETE << 8);	/* msg byte */
	/* cmd->result |= (GOOD < 1); */		/* status byte */

	cmd->result |= (ei->ScsiStatus);
	/* printk("Scsistatus is 0x%02x\n", ei->ScsiStatus);  */

	/* copy the sense data whether we need to or not. */

	memcpy(cmd->sense_buffer, ei->SenseInfo, 
		ei->SenseLen > SCSI_SENSE_BUFFERSIZE ?
			SCSI_SENSE_BUFFERSIZE : 
			ei->SenseLen);
758
	scsi_set_resid(cmd, ei->ResidualCnt);
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	if(ei->CommandStatus != 0) 
	{ /* an error has occurred */ 
		switch(ei->CommandStatus)
		{
			case CMD_TARGET_STATUS:
				/* Pass it up to the upper layers... */
766
				if (!ei->ScsiStatus) {
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	/* Ordinarily, this case should never happen, but there is a bug
	   in some released firmware revisions that allows it to happen
	   if, for example, a 4100 backplane loses power and the tape
	   drive is in it.  We assume that it's a fatal error of some
	   kind because we can't show that it wasn't. We will make it
	   look like selection timeout since that is the most common
	   reason for this to occur, and it's severe enough. */

					cmd->result = DID_NO_CONNECT << 16;
				}
			break;
			case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
			break;
			case CMD_DATA_OVERRUN:
782
				dev_warn(&h->pdev->dev, "%p has"
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					" completed with data overrun "
784
					"reported\n", c);
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			break;
			case CMD_INVALID: {
787 788
				/* print_bytes(c, sizeof(*c), 1, 0);
				print_cmd(c); */
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     /* We get CMD_INVALID if you address a non-existent tape drive instead
	of a selection timeout (no response).  You will see this if you yank 
	out a tape drive, then try to access it. This is kind of a shame
	because it means that any other CMD_INVALID (e.g. driver bug) will
	get interpreted as a missing target. */
				cmd->result = DID_NO_CONNECT << 16;
				}
			break;
			case CMD_PROTOCOL_ERR:
798
				cmd->result = DID_ERROR << 16;
799 800
				dev_warn(&h->pdev->dev,
					"%p has protocol error\n", c);
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                        break;
			case CMD_HARDWARE_ERR:
				cmd->result = DID_ERROR << 16;
804 805
				dev_warn(&h->pdev->dev,
					"%p had hardware error\n", c);
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                        break;
			case CMD_CONNECTION_LOST:
				cmd->result = DID_ERROR << 16;
809 810
				dev_warn(&h->pdev->dev,
					"%p had connection lost\n", c);
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			break;
			case CMD_ABORTED:
				cmd->result = DID_ABORT << 16;
814
				dev_warn(&h->pdev->dev, "%p was aborted\n", c);
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			break;
			case CMD_ABORT_FAILED:
				cmd->result = DID_ERROR << 16;
818 819
				dev_warn(&h->pdev->dev,
					"%p reports abort failed\n", c);
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			break;
			case CMD_UNSOLICITED_ABORT:
				cmd->result = DID_ABORT << 16;
823
				dev_warn(&h->pdev->dev, "%p aborted due to an "
824
					"unsolicited abort\n", c);
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			break;
			case CMD_TIMEOUT:
				cmd->result = DID_TIME_OUT << 16;
828
				dev_warn(&h->pdev->dev, "%p timedout\n", c);
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			break;
830 831 832 833 834
			case CMD_UNABORTABLE:
				cmd->result = DID_ERROR << 16;
				dev_warn(&h->pdev->dev, "c %p command "
					"unabortable\n", c);
			break;
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			default:
				cmd->result = DID_ERROR << 16;
837 838
				dev_warn(&h->pdev->dev,
					"%p returned unknown status %x\n", c,
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						ei->CommandStatus); 
		}
	}
	cmd->scsi_done(cmd);
843
	scsi_cmd_free(h, c);
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}

static int
847
cciss_scsi_detect(ctlr_info_t *h)
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{
	struct Scsi_Host *sh;
	int error;

	sh = scsi_host_alloc(&cciss_driver_template, sizeof(struct ctlr_info *));
	if (sh == NULL)
		goto fail;
	sh->io_port = 0;	// good enough?  FIXME, 
	sh->n_io_port = 0;	// I don't think we use these two...
	sh->this_id = SELF_SCSI_ID;  
858
	sh->can_queue = cciss_tape_cmds;
859
	sh->sg_tablesize = h->maxsgentries;
860
	sh->max_cmd_len = MAX_COMMAND_SIZE;
861
	sh->max_sectors = h->cciss_max_sectors;
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	((struct cciss_scsi_adapter_data_t *) 
864 865 866
		h->scsi_ctlr)->scsi_host = sh;
	sh->hostdata[0] = (unsigned long) h;
	sh->irq = h->intr[SIMPLE_MODE_INT];
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	sh->unique_id = sh->irq;
868
	error = scsi_add_host(sh, &h->pdev->dev);
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	if (error)
		goto fail_host_put;
	scsi_scan_host(sh);
	return 1;

 fail_host_put:
	scsi_host_put(sh);
 fail:
	return 0;
}

static void
cciss_unmap_one(struct pci_dev *pdev,
882
		CommandList_struct *c,
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		size_t buflen,
		int data_direction)
{
	u64bit addr64;

888 889
	addr64.val32.lower = c->SG[0].Addr.lower;
	addr64.val32.upper = c->SG[0].Addr.upper;
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	pci_unmap_single(pdev, (dma_addr_t) addr64.val, buflen, data_direction);
}

static void
cciss_map_one(struct pci_dev *pdev,
895
		CommandList_struct *c,
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		unsigned char *buf,
		size_t buflen,
		int data_direction)
{
	__u64 addr64;

	addr64 = (__u64) pci_map_single(pdev, buf, buflen, data_direction);
903
	c->SG[0].Addr.lower =
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	  (__u32) (addr64 & (__u64) 0x00000000FFFFFFFF);
905
	c->SG[0].Addr.upper =
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	  (__u32) ((addr64 >> 32) & (__u64) 0x00000000FFFFFFFF);
907 908 909
	c->SG[0].Len = buflen;
	c->Header.SGList = (__u8) 1;   /* no. SGs contig in this cmd */
	c->Header.SGTotal = (__u16) 1; /* total sgs in this cmd list */
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}

static int
913 914
cciss_scsi_do_simple_cmd(ctlr_info_t *h,
			CommandList_struct *c,
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			unsigned char *scsi3addr, 
			unsigned char *cdb,
			unsigned char cdblen,
			unsigned char *buf, int bufsize,
			int direction)
{
921
	DECLARE_COMPLETION_ONSTACK(wait);
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923 924 925 926 927
	c->cmd_type = CMD_IOCTL_PEND; /* treat this like an ioctl */
	c->scsi_cmd = NULL;
	c->Header.ReplyQueue = 0;  /* unused in simple mode */
	memcpy(&c->Header.LUN, scsi3addr, sizeof(c->Header.LUN));
	c->Header.Tag.lower = c->busaddr;  /* Use k. address of cmd as tag */
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	// Fill in the request block...

	/* printk("Using scsi3addr 0x%02x%0x2%0x2%0x2%0x2%0x2%0x2%0x2\n", 
		scsi3addr[0], scsi3addr[1], scsi3addr[2], scsi3addr[3],
		scsi3addr[4], scsi3addr[5], scsi3addr[6], scsi3addr[7]); */

934 935 936 937 938 939 940
	memset(c->Request.CDB, 0, sizeof(c->Request.CDB));
	memcpy(c->Request.CDB, cdb, cdblen);
	c->Request.Timeout = 0;
	c->Request.CDBLen = cdblen;
	c->Request.Type.Type = TYPE_CMD;
	c->Request.Type.Attribute = ATTR_SIMPLE;
	c->Request.Type.Direction = direction;
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	/* Fill in the SG list and do dma mapping */
943
	cciss_map_one(h->pdev, c, (unsigned char *) buf,
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			bufsize, DMA_FROM_DEVICE); 

946 947
	c->waiting = &wait;
	enqueue_cmd_and_start_io(h, c);
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	wait_for_completion(&wait);

	/* undo the dma mapping */
951
	cciss_unmap_one(h->pdev, c, bufsize, DMA_FROM_DEVICE);
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	return(0);
}

static void 
956
cciss_scsi_interpret_error(ctlr_info_t *h, CommandList_struct *c)
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{
	ErrorInfo_struct *ei;

960
	ei = c->err_info;
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	switch(ei->CommandStatus)
	{
		case CMD_TARGET_STATUS:
964 965 966 967 968
			dev_warn(&h->pdev->dev,
				"cmd %p has completed with errors\n", c);
			dev_warn(&h->pdev->dev,
				"cmd %p has SCSI Status = %x\n",
				c, ei->ScsiStatus);
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			if (ei->ScsiStatus == 0)
970 971
				dev_warn(&h->pdev->dev,
				"SCSI status is abnormally zero.  "
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				"(probably indicates selection timeout "
				"reported incorrectly due to a known "
				"firmware bug, circa July, 2001.)\n");
		break;
		case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
977
			dev_info(&h->pdev->dev, "UNDERRUN\n");
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		break;
		case CMD_DATA_OVERRUN:
980
			dev_warn(&h->pdev->dev, "%p has"
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				" completed with data overrun "
982
				"reported\n", c);
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		break;
		case CMD_INVALID: {
			/* controller unfortunately reports SCSI passthru's */
			/* to non-existent targets as invalid commands. */
987 988
			dev_warn(&h->pdev->dev,
				"%p is reported invalid (probably means "
989 990 991
				"target device no longer present)\n", c);
			/* print_bytes((unsigned char *) c, sizeof(*c), 1, 0);
			print_cmd(c);  */
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			}
		break;
		case CMD_PROTOCOL_ERR:
995
			dev_warn(&h->pdev->dev, "%p has protocol error\n", c);
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		break;
		case CMD_HARDWARE_ERR:
			/* cmd->result = DID_ERROR << 16; */
999
			dev_warn(&h->pdev->dev, "%p had hardware error\n", c);
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		break;
		case CMD_CONNECTION_LOST:
1002
			dev_warn(&h->pdev->dev, "%p had connection lost\n", c);
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		break;
		case CMD_ABORTED:
1005
			dev_warn(&h->pdev->dev, "%p was aborted\n", c);
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		break;
		case CMD_ABORT_FAILED:
1008 1009
			dev_warn(&h->pdev->dev,
				"%p reports abort failed\n", c);
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		break;
		case CMD_UNSOLICITED_ABORT:
1012
			dev_warn(&h->pdev->dev,
1013
				"%p aborted due to an unsolicited abort\n", c);
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		break;
		case CMD_TIMEOUT:
1016
			dev_warn(&h->pdev->dev, "%p timedout\n", c);
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		break;
1018 1019 1020 1021
		case CMD_UNABORTABLE:
			dev_warn(&h->pdev->dev,
				"%p unabortable\n", c);
		break;
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		default:
1023 1024 1025
			dev_warn(&h->pdev->dev,
				"%p returned unknown status %x\n",
				c, ei->CommandStatus);
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	}
}

static int
1030
cciss_scsi_do_inquiry(ctlr_info_t *h, unsigned char *scsi3addr,
1031 1032
	unsigned char page, unsigned char *buf,
	unsigned char bufsize)
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{
	int rc;
1035
	CommandList_struct *c;
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	char cdb[6];
	ErrorInfo_struct *ei;
	unsigned long flags;

1040 1041 1042
	spin_lock_irqsave(&h->lock, flags);
	c = scsi_cmd_alloc(h);
	spin_unlock_irqrestore(&h->lock, flags);
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1043

1044
	if (c == NULL) {			/* trouble... */
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		printk("cmd_alloc returned NULL!\n");
		return -1;
	}

1049
	ei = c->err_info;
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	cdb[0] = CISS_INQUIRY;
1052 1053
	cdb[1] = (page != 0);
	cdb[2] = page;
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	cdb[3] = 0;
1055
	cdb[4] = bufsize;
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	cdb[5] = 0;
1057
	rc = cciss_scsi_do_simple_cmd(h, c, scsi3addr, cdb,
1058
				6, buf, bufsize, XFER_READ);
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	if (rc != 0) return rc; /* something went wrong */

	if (ei->CommandStatus != 0 && 
	    ei->CommandStatus != CMD_DATA_UNDERRUN) {
1064
		cciss_scsi_interpret_error(h, c);
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		rc = -1;
	}
1067 1068 1069
	spin_lock_irqsave(&h->lock, flags);
	scsi_cmd_free(h, c);
	spin_unlock_irqrestore(&h->lock, flags);
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	return rc;	
}

1073
/* Get the device id from inquiry page 0x83 */
1074
static int cciss_scsi_get_device_id(ctlr_info_t *h, unsigned char *scsi3addr,
1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
	unsigned char *device_id, int buflen)
{
	int rc;
	unsigned char *buf;

	if (buflen > 16)
		buflen = 16;
	buf = kzalloc(64, GFP_KERNEL);
	if (!buf)
		return -1;
1085
	rc = cciss_scsi_do_inquiry(h, scsi3addr, 0x83, buf, 64);
1086 1087 1088 1089 1090 1091
	if (rc == 0)
		memcpy(device_id, &buf[8], buflen);
	kfree(buf);
	return rc != 0;
}

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static int
1093
cciss_scsi_do_report_phys_luns(ctlr_info_t *h,
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		ReportLunData_struct *buf, int bufsize)
{
	int rc;
1097
	CommandList_struct *c;
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	unsigned char cdb[12];
	unsigned char scsi3addr[8]; 
	ErrorInfo_struct *ei;
	unsigned long flags;

1103 1104 1105 1106
	spin_lock_irqsave(&h->lock, flags);
	c = scsi_cmd_alloc(h);
	spin_unlock_irqrestore(&h->lock, flags);
	if (c == NULL) {			/* trouble... */
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1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124
		printk("cmd_alloc returned NULL!\n");
		return -1;
	}

	memset(&scsi3addr[0], 0, 8); /* address the controller */
	cdb[0] = CISS_REPORT_PHYS;
	cdb[1] = 0;
	cdb[2] = 0;
	cdb[3] = 0;
	cdb[4] = 0;
	cdb[5] = 0;
	cdb[6] = (bufsize >> 24) & 0xFF;  //MSB
	cdb[7] = (bufsize >> 16) & 0xFF;
	cdb[8] = (bufsize >> 8) & 0xFF;
	cdb[9] = bufsize & 0xFF;
	cdb[10] = 0;
	cdb[11] = 0;

1125
	rc = cciss_scsi_do_simple_cmd(h, c, scsi3addr,
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				cdb, 12, 
				(unsigned char *) buf, 
				bufsize, XFER_READ);

	if (rc != 0) return rc; /* something went wrong */

1132
	ei = c->err_info;
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	if (ei->CommandStatus != 0 && 
	    ei->CommandStatus != CMD_DATA_UNDERRUN) {
1135
		cciss_scsi_interpret_error(h, c);
L
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		rc = -1;
	}
1138 1139 1140
	spin_lock_irqsave(&h->lock, flags);
	scsi_cmd_free(h, c);
	spin_unlock_irqrestore(&h->lock, flags);
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	return rc;	
}

static void
1145
cciss_update_non_disk_devices(ctlr_info_t *h, int hostno)
L
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1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
{
	/* the idea here is we could get notified from /proc
	   that some devices have changed, so we do a report 
	   physical luns cmd, and adjust our list of devices 
	   accordingly.  (We can't rely on the scsi-mid layer just
	   doing inquiries, because the "busses" that the scsi 
	   mid-layer probes are totally fabricated by this driver,
	   so new devices wouldn't show up.

	   the scsi3addr's of devices won't change so long as the 
	   adapter is not reset.  That means we can rescan and 
	   tell which devices we already know about, vs. new 
	   devices, vs.  disappearing devices.

	   Also, if you yank out a tape drive, then put in a disk
	   in it's place, (say, a configured volume from another 
	   array controller for instance)  _don't_ poke this driver 
           (so it thinks it's still a tape, but _do_ poke the scsi 
           mid layer, so it does an inquiry... the scsi mid layer 
           will see the physical disk.  This would be bad.  Need to
	   think about how to prevent that.  One idea would be to 
	   snoop all scsi responses and if an inquiry repsonse comes
	   back that reports a disk, chuck it an return selection
	   timeout instead and adjust our table...  Not sure i like
	   that though.  

	 */
1173 1174
#define OBDR_TAPE_INQ_SIZE 49
#define OBDR_TAPE_SIG "$DR-10"
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	ReportLunData_struct *ld_buff;
1176
	unsigned char *inq_buff;
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	unsigned char scsi3addr[8];
	__u32 num_luns=0;
	unsigned char *ch;
1180
	struct cciss_scsi_dev_t *currentsd, *this_device;
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	int ncurrent=0;
	int reportlunsize = sizeof(*ld_buff) + CISS_MAX_PHYS_LUN * 8;
	int i;

1185
	ld_buff = kzalloc(reportlunsize, GFP_KERNEL);
1186
	inq_buff = kmalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL);
1187 1188 1189 1190 1191
	currentsd = kzalloc(sizeof(*currentsd) *
			(CCISS_MAX_SCSI_DEVS_PER_HBA+1), GFP_KERNEL);
	if (ld_buff == NULL || inq_buff == NULL || currentsd == NULL) {
		printk(KERN_ERR "cciss: out of memory\n");
		goto out;
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	}
1193
	this_device = &currentsd[CCISS_MAX_SCSI_DEVS_PER_HBA];
1194
	if (cciss_scsi_do_report_phys_luns(h, ld_buff, reportlunsize) == 0) {
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		ch = &ld_buff->LUNListLength[0];
		num_luns = ((ch[0]<<24) | (ch[1]<<16) | (ch[2]<<8) | ch[3]) / 8;
		if (num_luns > CISS_MAX_PHYS_LUN) {
			printk(KERN_WARNING 
				"cciss: Maximum physical LUNs (%d) exceeded.  "
				"%d LUNs ignored.\n", CISS_MAX_PHYS_LUN, 
				num_luns - CISS_MAX_PHYS_LUN);
			num_luns = CISS_MAX_PHYS_LUN;
		}
	}
	else {
		printk(KERN_ERR  "cciss: Report physical LUNs failed.\n");
		goto out;
	}


	/* adjust our table of devices */	
1212
	for (i = 0; i < num_luns; i++) {
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		/* for each physical lun, do an inquiry */
		if (ld_buff->LUN[i][3] & 0xC0) continue;
1215
		memset(inq_buff, 0, OBDR_TAPE_INQ_SIZE);
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		memcpy(&scsi3addr[0], &ld_buff->LUN[i][0], 8);

1218
		if (cciss_scsi_do_inquiry(h, scsi3addr, 0, inq_buff,
1219
			(unsigned char) OBDR_TAPE_INQ_SIZE) != 0)
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			/* Inquiry failed (msg printed already) */
1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235
			continue; /* so we will skip this device. */

		this_device->devtype = (inq_buff[0] & 0x1f);
		this_device->bus = -1;
		this_device->target = -1;
		this_device->lun = -1;
		memcpy(this_device->scsi3addr, scsi3addr, 8);
		memcpy(this_device->vendor, &inq_buff[8],
			sizeof(this_device->vendor));
		memcpy(this_device->model, &inq_buff[16],
			sizeof(this_device->model));
		memcpy(this_device->revision, &inq_buff[32],
			sizeof(this_device->revision));
		memset(this_device->device_id, 0,
			sizeof(this_device->device_id));
1236
		cciss_scsi_get_device_id(h, scsi3addr,
1237 1238 1239
			this_device->device_id, sizeof(this_device->device_id));

		switch (this_device->devtype)
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		{
1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258
		  case 0x05: /* CD-ROM */ {

			/* We don't *really* support actual CD-ROM devices,
			 * just this "One Button Disaster Recovery" tape drive
			 * which temporarily pretends to be a CD-ROM drive.
			 * So we check that the device is really an OBDR tape
			 * device by checking for "$DR-10" in bytes 43-48 of
			 * the inquiry data.
			 */
				char obdr_sig[7];

				strncpy(obdr_sig, &inq_buff[43], 6);
				obdr_sig[6] = '\0';
				if (strncmp(obdr_sig, OBDR_TAPE_SIG, 6) != 0)
					/* Not OBDR device, ignore it. */
					break;
			}
			/* fall through . . . */
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		  case 0x01: /* sequential access, (tape) */
		  case 0x08: /* medium changer */
			if (ncurrent >= CCISS_MAX_SCSI_DEVS_PER_HBA) {
				printk(KERN_INFO "cciss%d: %s ignored, "
1263
					"too many devices.\n", h->ctlr,
1264
					scsi_device_type(this_device->devtype));
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1265 1266
				break;
			}
1267
			currentsd[ncurrent] = *this_device;
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			ncurrent++;
			break;
		  default: 
			break;
		}
	}

1275
	adjust_cciss_scsi_table(h, hostno, currentsd, ncurrent);
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out:
	kfree(inq_buff);
	kfree(ld_buff);
1279
	kfree(currentsd);
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1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293
	return;
}

static int
is_keyword(char *ptr, int len, char *verb)  // Thanks to ncr53c8xx.c
{
	int verb_len = strlen(verb);
	if (len >= verb_len && !memcmp(verb,ptr,verb_len))
		return verb_len;
	else
		return 0;
}

static int
1294
cciss_scsi_user_command(ctlr_info_t *h, int hostno, char *buffer, int length)
L
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1295 1296 1297 1298
{
	int arg_len;

	if ((arg_len = is_keyword(buffer, length, "rescan")) != 0)
1299
		cciss_update_non_disk_devices(h, hostno);
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	else
		return -EINVAL;
	return length;
}


static int
cciss_scsi_proc_info(struct Scsi_Host *sh,
		char *buffer, /* data buffer */
		char **start, 	   /* where data in buffer starts */
		off_t offset,	   /* offset from start of imaginary file */
		int length, 	   /* length of data in buffer */
		int func)	   /* 0 == read, 1 == write */
{

	int buflen, datalen;
1316
	ctlr_info_t *h;
1317
	int i;
L
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1318

1319 1320
	h = (ctlr_info_t *) sh->hostdata[0];
	if (h == NULL)  /* This really shouldn't ever happen. */
L
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1321 1322 1323
		return -EINVAL;

	if (func == 0) {	/* User is reading from /proc/scsi/ciss*?/?*  */
1324
		buflen = sprintf(buffer, "cciss%d: SCSI host: %d\n",
1325
				h->ctlr, sh->host_no);
1326 1327 1328 1329 1330 1331 1332 1333 1334

		/* this information is needed by apps to know which cciss
		   device corresponds to which scsi host number without
		   having to open a scsi target device node.  The device
		   information is not a duplicate of /proc/scsi/scsi because
		   the two may be out of sync due to scsi hotplug, rather
		   this info is for an app to be able to use to know how to
		   get them back in sync. */

1335 1336 1337
		for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++) {
			struct cciss_scsi_dev_t *sd =
				&ccissscsi[h->ctlr].dev[i];
1338 1339 1340 1341 1342 1343 1344 1345 1346
			buflen += sprintf(&buffer[buflen], "c%db%dt%dl%d %02d "
				"0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
				sh->host_no, sd->bus, sd->target, sd->lun,
				sd->devtype,
				sd->scsi3addr[0], sd->scsi3addr[1],
				sd->scsi3addr[2], sd->scsi3addr[3],
				sd->scsi3addr[4], sd->scsi3addr[5],
				sd->scsi3addr[6], sd->scsi3addr[7]);
		}
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1347 1348 1349 1350 1351 1352 1353 1354
		datalen = buflen - offset;
		if (datalen < 0) { 	/* they're reading past EOF. */
			datalen = 0;
			*start = buffer+buflen;	
		} else
			*start = buffer + offset;
		return(datalen);
	} else 	/* User is writing to /proc/scsi/cciss*?/?*  ... */
1355
		return cciss_scsi_user_command(h, sh->host_no,
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			buffer, length);	
} 

/* cciss_scatter_gather takes a struct scsi_cmnd, (cmd), and does the pci 
   dma mapping  and fills in the scatter gather entries of the 
1361
   cciss command, c. */
L
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1363
static void cciss_scatter_gather(ctlr_info_t *h, CommandList_struct *c,
1364
	struct scsi_cmnd *cmd)
L
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1365
{
1366 1367
	unsigned int len;
	struct scatterlist *sg;
L
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1368
	__u64 addr64;
1369 1370 1371 1372 1373 1374 1375 1376
	int request_nsgs, i, chained, sg_index;
	struct cciss_scsi_adapter_data_t *sa = h->scsi_ctlr;
	SGDescriptor_struct *curr_sg;

	BUG_ON(scsi_sg_count(cmd) > h->maxsgentries);

	chained = 0;
	sg_index = 0;
1377
	curr_sg = c->SG;
1378 1379 1380 1381 1382 1383 1384
	request_nsgs = scsi_dma_map(cmd);
	if (request_nsgs) {
		scsi_for_each_sg(cmd, sg, request_nsgs, i) {
			if (sg_index + 1 == h->max_cmd_sgentries &&
				!chained && request_nsgs - i > 1) {
				chained = 1;
				sg_index = 0;
1385
				curr_sg = sa->cmd_sg_list[c->cmdindex];
1386
			}
1387 1388
			addr64 = (__u64) sg_dma_address(sg);
			len  = sg_dma_len(sg);
1389 1390 1391 1392 1393 1394 1395
			curr_sg[sg_index].Addr.lower =
				(__u32) (addr64 & 0x0FFFFFFFFULL);
			curr_sg[sg_index].Addr.upper =
				(__u32) ((addr64 >> 32) & 0x0FFFFFFFFULL);
			curr_sg[sg_index].Len = len;
			curr_sg[sg_index].Ext = 0;
			++sg_index;
L
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1396
		}
1397
		if (chained)
1398 1399
			cciss_map_sg_chain_block(h, c,
				sa->cmd_sg_list[c->cmdindex],
1400 1401
				(request_nsgs - (h->max_cmd_sgentries - 1)) *
					sizeof(SGDescriptor_struct));
1402
	}
1403 1404 1405
	/* track how many SG entries we are using */
	if (request_nsgs > h->maxSG)
		h->maxSG = request_nsgs;
1406
	c->Header.SGTotal = (u16) request_nsgs + chained;
1407
	if (request_nsgs > h->max_cmd_sgentries)
1408
		c->Header.SGList = h->max_cmd_sgentries;
1409
	else
1410
		c->Header.SGList = c->Header.SGTotal;
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1411 1412 1413 1414 1415
	return;
}


static int
J
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1416
cciss_scsi_queue_command_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
L
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1417
{
1418 1419
	ctlr_info_t *h;
	int rc;
L
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1420
	unsigned char scsi3addr[8];
1421
	CommandList_struct *c;
L
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1422 1423 1424 1425
	unsigned long flags;

	// Get the ptr to our adapter structure (hba[i]) out of cmd->host.
	// We violate cmd->host privacy here.  (Is there another way?)
1426
	h = (ctlr_info_t *) cmd->device->host->hostdata[0];
L
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1427

1428
	rc = lookup_scsi3addr(h, cmd->device->channel, cmd->device->id,
L
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			cmd->device->lun, scsi3addr);
	if (rc != 0) {
		/* the scsi nexus does not match any that we presented... */
		/* pretend to mid layer that we got selection timeout */
		cmd->result = DID_NO_CONNECT << 16;
		done(cmd);
		/* we might want to think about registering controller itself
		   as a processor device on the bus so sg binds to it. */
		return 0;
	}

	/* Ok, we have a reasonable scsi nexus, so send the cmd down, and
           see what the device thinks of it. */

1443 1444 1445 1446
	spin_lock_irqsave(&h->lock, flags);
	c = scsi_cmd_alloc(h);
	spin_unlock_irqrestore(&h->lock, flags);
	if (c == NULL) {			/* trouble... */
1447
		dev_warn(&h->pdev->dev, "scsi_cmd_alloc returned NULL!\n");
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1448 1449 1450 1451 1452 1453 1454 1455 1456 1457
		/* FIXME: next 3 lines are -> BAD! <- */
		cmd->result = DID_NO_CONNECT << 16;
		done(cmd);
		return 0;
	}

	// Fill in the command list header

	cmd->scsi_done = done;    // save this for use by completion code 

1458 1459
	/* save c in case we have to abort it */
	cmd->host_scribble = (unsigned char *) c;
L
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1461 1462 1463 1464 1465
	c->cmd_type = CMD_SCSI;
	c->scsi_cmd = cmd;
	c->Header.ReplyQueue = 0;  /* unused in simple mode */
	memcpy(&c->Header.LUN.LunAddrBytes[0], &scsi3addr[0], 8);
	c->Header.Tag.lower = c->busaddr;  /* Use k. address of cmd as tag */
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	// Fill in the request block...

1469 1470 1471 1472 1473 1474 1475
	c->Request.Timeout = 0;
	memset(c->Request.CDB, 0, sizeof(c->Request.CDB));
	BUG_ON(cmd->cmd_len > sizeof(c->Request.CDB));
	c->Request.CDBLen = cmd->cmd_len;
	memcpy(c->Request.CDB, cmd->cmnd, cmd->cmd_len);
	c->Request.Type.Type = TYPE_CMD;
	c->Request.Type.Attribute = ATTR_SIMPLE;
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	switch(cmd->sc_data_direction)
	{
1478 1479 1480 1481 1482 1483 1484 1485 1486
	  case DMA_TO_DEVICE:
		c->Request.Type.Direction = XFER_WRITE;
		break;
	  case DMA_FROM_DEVICE:
		c->Request.Type.Direction = XFER_READ;
		break;
	  case DMA_NONE:
		c->Request.Type.Direction = XFER_NONE;
		break;
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	  case DMA_BIDIRECTIONAL:
		// This can happen if a buggy application does a scsi passthru
		// and sets both inlen and outlen to non-zero. ( see
		// ../scsi/scsi_ioctl.c:scsi_ioctl_send_command() )

1492
		c->Request.Type.Direction = XFER_RSVD;
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		// This is technically wrong, and cciss controllers should
		// reject it with CMD_INVALID, which is the most correct 
		// response, but non-fibre backends appear to let it 
		// slide by, and give the same results as if this field
		// were set correctly.  Either way is acceptable for
		// our purposes here.

		break;

	  default: 
1503
		dev_warn(&h->pdev->dev, "unknown data direction: %d\n",
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			cmd->sc_data_direction);
		BUG();
		break;
	}
1508 1509
	cciss_scatter_gather(h, c, cmd);
	enqueue_cmd_and_start_io(h, c);
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	/* the cmd'll come back via intr handler in complete_scsi_command()  */
	return 0;
}

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static DEF_SCSI_QCMD(cciss_scsi_queue_command)

1516
static void cciss_unregister_scsi(ctlr_info_t *h)
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{
	struct cciss_scsi_adapter_data_t *sa;
	struct cciss_scsi_cmd_stack_t *stk;
	unsigned long flags;

	/* we are being forcibly unloaded, and may not refuse. */

1524 1525
	spin_lock_irqsave(&h->lock, flags);
	sa = h->scsi_ctlr;
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	stk = &sa->cmd_stack; 

	/* if we weren't ever actually registered, don't unregister */ 
	if (sa->registered) {
1530
		spin_unlock_irqrestore(&h->lock, flags);
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		scsi_remove_host(sa->scsi_host);
		scsi_host_put(sa->scsi_host);
1533
		spin_lock_irqsave(&h->lock, flags);
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	}

	/* set scsi_host to NULL so our detect routine will 
	   find us on register */
	sa->scsi_host = NULL;
1539 1540
	spin_unlock_irqrestore(&h->lock, flags);
	scsi_cmd_stack_free(h);
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1541 1542 1543
	kfree(sa);
}

1544
static int cciss_engage_scsi(ctlr_info_t *h)
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{
	struct cciss_scsi_adapter_data_t *sa;
	struct cciss_scsi_cmd_stack_t *stk;
	unsigned long flags;

1550 1551
	spin_lock_irqsave(&h->lock, flags);
	sa = h->scsi_ctlr;
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1552 1553
	stk = &sa->cmd_stack; 

1554
	if (sa->registered) {
1555
		dev_info(&h->pdev->dev, "SCSI subsystem already engaged.\n");
1556
		spin_unlock_irqrestore(&h->lock, flags);
1557
		return -ENXIO;
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	}
1559
	sa->registered = 1;
1560 1561 1562
	spin_unlock_irqrestore(&h->lock, flags);
	cciss_update_non_disk_devices(h, -1);
	cciss_scsi_detect(h);
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	return 0;
}

static void
1567
cciss_seq_tape_report(struct seq_file *seq, ctlr_info_t *h)
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{
	unsigned long flags;

1571
	CPQ_TAPE_LOCK(h, flags);
1572
	seq_printf(seq,
1573
		"Sequential access devices: %d\n\n",
1574 1575
			ccissscsi[h->ctlr].ndevices);
	CPQ_TAPE_UNLOCK(h, flags);
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}

1578 1579 1580 1581 1582 1583 1584 1585
static int wait_for_device_to_become_ready(ctlr_info_t *h,
	unsigned char lunaddr[])
{
	int rc;
	int count = 0;
	int waittime = HZ;
	CommandList_struct *c;

1586
	c = cmd_alloc(h);
1587
	if (!c) {
1588 1589
		dev_warn(&h->pdev->dev, "out of memory in "
			"wait_for_device_to_become_ready.\n");
1590 1591 1592 1593 1594 1595 1596 1597 1598
		return IO_ERROR;
	}

	/* Send test unit ready until device ready, or give up. */
	while (count < 20) {

		/* Wait for a bit.  do this first, because if we send
		 * the TUR right away, the reset will just abort it.
		 */
1599
		schedule_timeout_uninterruptible(waittime);
1600 1601 1602 1603 1604 1605 1606
		count++;

		/* Increase wait time with each try, up to a point. */
		if (waittime < (HZ * 30))
			waittime = waittime * 2;

		/* Send the Test Unit Ready */
1607
		rc = fill_cmd(h, c, TEST_UNIT_READY, NULL, 0, 0,
1608
			lunaddr, TYPE_CMD);
1609 1610 1611 1612
		if (rc == 0)
			rc = sendcmd_withirq_core(h, c, 0);

		(void) process_sendcmd_error(h, c);
1613

1614 1615
		if (rc != 0)
			goto retry_tur;
1616

1617
		if (c->err_info->CommandStatus == CMD_SUCCESS)
1618 1619
			break;

1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632
		if (c->err_info->CommandStatus == CMD_TARGET_STATUS &&
			c->err_info->ScsiStatus == SAM_STAT_CHECK_CONDITION) {
			if (c->err_info->SenseInfo[2] == NO_SENSE)
				break;
			if (c->err_info->SenseInfo[2] == UNIT_ATTENTION) {
				unsigned char asc;
				asc = c->err_info->SenseInfo[12];
				check_for_unit_attention(h, c);
				if (asc == POWER_OR_RESET)
					break;
			}
		}
retry_tur:
1633
		dev_warn(&h->pdev->dev, "Waiting %d secs "
1634
			"for device to become ready.\n",
1635
			waittime / HZ);
1636 1637 1638 1639
		rc = 1; /* device not ready. */
	}

	if (rc)
1640
		dev_warn(&h->pdev->dev, "giving up on device.\n");
1641
	else
1642
		dev_warn(&h->pdev->dev, "device is ready.\n");
1643

1644
	cmd_free(h, c);
1645 1646
	return rc;
}
1647

1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662
/* Need at least one of these error handlers to keep ../scsi/hosts.c from 
 * complaining.  Doing a host- or bus-reset can't do anything good here. 
 * Despite what it might say in scsi_error.c, there may well be commands
 * on the controller, as the cciss driver registers twice, once as a block
 * device for the logical drives, and once as a scsi device, for any tape
 * drives.  So we know there are no commands out on the tape drives, but we
 * don't know there are no commands on the controller, and it is likely 
 * that there probably are, as the cciss block device is most commonly used
 * as a boot device (embedded controller on HP/Compaq systems.)
*/

static int cciss_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
{
	int rc;
	CommandList_struct *cmd_in_trouble;
1663
	unsigned char lunaddr[8];
1664
	ctlr_info_t *h;
1665 1666

	/* find the controller to which the command to be aborted was sent */
1667 1668
	h = (ctlr_info_t *) scsicmd->device->host->hostdata[0];
	if (h == NULL) /* paranoia */
1669
		return FAILED;
1670
	dev_warn(&h->pdev->dev, "resetting tape drive or medium changer.\n");
1671 1672
	/* find the command that's giving us trouble */
	cmd_in_trouble = (CommandList_struct *) scsicmd->host_scribble;
1673
	if (cmd_in_trouble == NULL) /* paranoia */
1674
		return FAILED;
1675
	memcpy(lunaddr, &cmd_in_trouble->Header.LUN.LunAddrBytes[0], 8);
1676
	/* send a reset to the SCSI LUN which the command was sent to */
1677
	rc = sendcmd_withirq(h, CCISS_RESET_MSG, NULL, 0, 0, lunaddr,
1678
		TYPE_MSG);
1679
	if (rc == 0 && wait_for_device_to_become_ready(h, lunaddr) == 0)
1680
		return SUCCESS;
1681
	dev_warn(&h->pdev->dev, "resetting device failed.\n");
1682 1683 1684 1685 1686 1687 1688
	return FAILED;
}

static int  cciss_eh_abort_handler(struct scsi_cmnd *scsicmd)
{
	int rc;
	CommandList_struct *cmd_to_abort;
1689
	unsigned char lunaddr[8];
1690
	ctlr_info_t *h;
1691 1692

	/* find the controller to which the command to be aborted was sent */
1693 1694
	h = (ctlr_info_t *) scsicmd->device->host->hostdata[0];
	if (h == NULL) /* paranoia */
1695
		return FAILED;
1696
	dev_warn(&h->pdev->dev, "aborting tardy SCSI cmd\n");
1697 1698 1699 1700 1701

	/* find the command to be aborted */
	cmd_to_abort = (CommandList_struct *) scsicmd->host_scribble;
	if (cmd_to_abort == NULL) /* paranoia */
		return FAILED;
1702
	memcpy(lunaddr, &cmd_to_abort->Header.LUN.LunAddrBytes[0], 8);
1703
	rc = sendcmd_withirq(h, CCISS_ABORT_MSG, &cmd_to_abort->Header.Tag,
1704
		0, 0, lunaddr, TYPE_MSG);
1705 1706 1707 1708 1709 1710
	if (rc == 0)
		return SUCCESS;
	return FAILED;

}

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#else /* no CONFIG_CISS_SCSI_TAPE */

/* If no tape support, then these become defined out of existence */

#define cciss_scsi_setup(cntl_num)
1716
#define cciss_engage_scsi(h)
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#endif /* CONFIG_CISS_SCSI_TAPE */