cciss_scsi.c 48.3 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++;
580 581 582
			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... */
				if( ei->ScsiStatus)
                		{
#if 0
                    			printk(KERN_WARNING "cciss: cmd %p "
770 771
						"has SCSI Status = %x\n",
						c, ei->ScsiStatus);
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#endif
773
					cmd->result |= (ei->ScsiStatus << 1);
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                		}
				else {  /* scsi status is zero??? How??? */
					
	/* 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:
791
				dev_warn(&h->pdev->dev, "%p has"
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					" completed with data overrun "
793
					"reported\n", c);
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			break;
			case CMD_INVALID: {
796 797
				/* 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:
807 808
				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;
812 813
				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;
817 818
				dev_warn(&h->pdev->dev,
					"%p had connection lost\n", c);
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			break;
			case CMD_ABORTED:
				cmd->result = DID_ABORT << 16;
822
				dev_warn(&h->pdev->dev, "%p was aborted\n", c);
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			break;
			case CMD_ABORT_FAILED:
				cmd->result = DID_ERROR << 16;
826 827
				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;
831
				dev_warn(&h->pdev->dev, "%p aborted due to an "
832
					"unsolicited abort\n", c);
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			break;
			case CMD_TIMEOUT:
				cmd->result = DID_TIME_OUT << 16;
836
				dev_warn(&h->pdev->dev, "%p timedout\n", c);
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			break;
838 839 840 841 842
			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;
845 846
				dev_warn(&h->pdev->dev,
					"%p returned unknown status %x\n", c,
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						ei->CommandStatus); 
		}
	}
	cmd->scsi_done(cmd);
851
	scsi_cmd_free(h, c);
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}

static int
855
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;  
866
	sh->can_queue = cciss_tape_cmds;
867
	sh->sg_tablesize = h->maxsgentries;
868
	sh->max_cmd_len = MAX_COMMAND_SIZE;
869
	sh->max_sectors = h->cciss_max_sectors;
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	((struct cciss_scsi_adapter_data_t *) 
872 873 874
		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;
876
	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,
890
		CommandList_struct *c,
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		size_t buflen,
		int data_direction)
{
	u64bit addr64;

896 897
	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,
903
		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);
911
	c->SG[0].Addr.lower =
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	  (__u32) (addr64 & (__u64) 0x00000000FFFFFFFF);
913
	c->SG[0].Addr.upper =
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	  (__u32) ((addr64 >> 32) & (__u64) 0x00000000FFFFFFFF);
915 916 917
	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
921 922
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)
{
929
	DECLARE_COMPLETION_ONSTACK(wait);
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931 932 933 934 935
	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]); */

942 943 944 945 946 947 948
	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 */
951
	cciss_map_one(h->pdev, c, (unsigned char *) buf,
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			bufsize, DMA_FROM_DEVICE); 

954 955
	c->waiting = &wait;
	enqueue_cmd_and_start_io(h, c);
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	wait_for_completion(&wait);

	/* undo the dma mapping */
959
	cciss_unmap_one(h->pdev, c, bufsize, DMA_FROM_DEVICE);
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	return(0);
}

static void 
964
cciss_scsi_interpret_error(ctlr_info_t *h, CommandList_struct *c)
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{
	ErrorInfo_struct *ei;

968
	ei = c->err_info;
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	switch(ei->CommandStatus)
	{
		case CMD_TARGET_STATUS:
972 973 974 975 976
			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)
978 979
				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. */
985
			dev_info(&h->pdev->dev, "UNDERRUN\n");
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		break;
		case CMD_DATA_OVERRUN:
988
			dev_warn(&h->pdev->dev, "%p has"
L
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989
				" completed with data overrun "
990
				"reported\n", c);
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		break;
		case CMD_INVALID: {
			/* controller unfortunately reports SCSI passthru's */
			/* to non-existent targets as invalid commands. */
995 996
			dev_warn(&h->pdev->dev,
				"%p is reported invalid (probably means "
997 998 999
				"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:
1003
			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; */
1007
			dev_warn(&h->pdev->dev, "%p had hardware error\n", c);
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		break;
		case CMD_CONNECTION_LOST:
1010
			dev_warn(&h->pdev->dev, "%p had connection lost\n", c);
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		break;
		case CMD_ABORTED:
1013
			dev_warn(&h->pdev->dev, "%p was aborted\n", c);
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		break;
		case CMD_ABORT_FAILED:
1016 1017
			dev_warn(&h->pdev->dev,
				"%p reports abort failed\n", c);
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		break;
		case CMD_UNSOLICITED_ABORT:
1020
			dev_warn(&h->pdev->dev,
1021
				"%p aborted due to an unsolicited abort\n", c);
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		break;
		case CMD_TIMEOUT:
1024
			dev_warn(&h->pdev->dev, "%p timedout\n", c);
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1025
		break;
1026 1027 1028 1029
		case CMD_UNABORTABLE:
			dev_warn(&h->pdev->dev,
				"%p unabortable\n", c);
		break;
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		default:
1031 1032 1033
			dev_warn(&h->pdev->dev,
				"%p returned unknown status %x\n",
				c, ei->CommandStatus);
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	}
}

static int
1038
cciss_scsi_do_inquiry(ctlr_info_t *h, unsigned char *scsi3addr,
1039 1040
	unsigned char page, unsigned char *buf,
	unsigned char bufsize)
L
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{
	int rc;
1043
	CommandList_struct *c;
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1044 1045 1046 1047
	char cdb[6];
	ErrorInfo_struct *ei;
	unsigned long flags;

1048 1049 1050
	spin_lock_irqsave(&h->lock, flags);
	c = scsi_cmd_alloc(h);
	spin_unlock_irqrestore(&h->lock, flags);
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1051

1052
	if (c == NULL) {			/* trouble... */
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1053 1054 1055 1056
		printk("cmd_alloc returned NULL!\n");
		return -1;
	}

1057
	ei = c->err_info;
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1058 1059

	cdb[0] = CISS_INQUIRY;
1060 1061
	cdb[1] = (page != 0);
	cdb[2] = page;
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	cdb[3] = 0;
1063
	cdb[4] = bufsize;
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1064
	cdb[5] = 0;
1065
	rc = cciss_scsi_do_simple_cmd(h, c, scsi3addr, cdb,
1066
				6, buf, bufsize, XFER_READ);
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1067 1068 1069 1070 1071

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

	if (ei->CommandStatus != 0 && 
	    ei->CommandStatus != CMD_DATA_UNDERRUN) {
1072
		cciss_scsi_interpret_error(h, c);
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		rc = -1;
	}
1075 1076 1077
	spin_lock_irqsave(&h->lock, flags);
	scsi_cmd_free(h, c);
	spin_unlock_irqrestore(&h->lock, flags);
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	return rc;	
}

1081
/* Get the device id from inquiry page 0x83 */
1082
static int cciss_scsi_get_device_id(ctlr_info_t *h, unsigned char *scsi3addr,
1083 1084 1085 1086 1087 1088 1089 1090 1091 1092
	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;
1093
	rc = cciss_scsi_do_inquiry(h, scsi3addr, 0x83, buf, 64);
1094 1095 1096 1097 1098 1099
	if (rc == 0)
		memcpy(device_id, &buf[8], buflen);
	kfree(buf);
	return rc != 0;
}

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static int
1101
cciss_scsi_do_report_phys_luns(ctlr_info_t *h,
L
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		ReportLunData_struct *buf, int bufsize)
{
	int rc;
1105
	CommandList_struct *c;
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1106 1107 1108 1109 1110
	unsigned char cdb[12];
	unsigned char scsi3addr[8]; 
	ErrorInfo_struct *ei;
	unsigned long flags;

1111 1112 1113 1114
	spin_lock_irqsave(&h->lock, flags);
	c = scsi_cmd_alloc(h);
	spin_unlock_irqrestore(&h->lock, flags);
	if (c == NULL) {			/* trouble... */
L
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1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132
		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;

1133
	rc = cciss_scsi_do_simple_cmd(h, c, scsi3addr,
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1134 1135 1136 1137 1138 1139
				cdb, 12, 
				(unsigned char *) buf, 
				bufsize, XFER_READ);

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

1140
	ei = c->err_info;
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	if (ei->CommandStatus != 0 && 
	    ei->CommandStatus != CMD_DATA_UNDERRUN) {
1143
		cciss_scsi_interpret_error(h, c);
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1144 1145
		rc = -1;
	}
1146 1147 1148
	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
1153
cciss_update_non_disk_devices(ctlr_info_t *h, int hostno)
L
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1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180
{
	/* 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.  

	 */
1181 1182
#define OBDR_TAPE_INQ_SIZE 49
#define OBDR_TAPE_SIG "$DR-10"
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	ReportLunData_struct *ld_buff;
1184
	unsigned char *inq_buff;
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	unsigned char scsi3addr[8];
	__u32 num_luns=0;
	unsigned char *ch;
1188
	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;

1193
	ld_buff = kzalloc(reportlunsize, GFP_KERNEL);
1194
	inq_buff = kmalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL);
1195 1196 1197 1198 1199
	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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	}
1201
	this_device = &currentsd[CCISS_MAX_SCSI_DEVS_PER_HBA];
1202
	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 */	
1220
	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;
1223
		memset(inq_buff, 0, OBDR_TAPE_INQ_SIZE);
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		memcpy(&scsi3addr[0], &ld_buff->LUN[i][0], 8);

1226
		if (cciss_scsi_do_inquiry(h, scsi3addr, 0, inq_buff,
1227
			(unsigned char) OBDR_TAPE_INQ_SIZE) != 0)
L
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			/* Inquiry failed (msg printed already) */
1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
			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));
1244
		cciss_scsi_get_device_id(h, scsi3addr,
1245 1246 1247
			this_device->device_id, sizeof(this_device->device_id));

		switch (this_device->devtype)
L
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		{
1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266
		  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, "
1271
					"too many devices.\n", h->ctlr,
1272
					scsi_device_type(this_device->devtype));
L
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1273 1274
				break;
			}
1275
			currentsd[ncurrent] = *this_device;
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			ncurrent++;
			break;
		  default: 
			break;
		}
	}

1283
	adjust_cciss_scsi_table(h, hostno, currentsd, ncurrent);
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out:
	kfree(inq_buff);
	kfree(ld_buff);
1287
	kfree(currentsd);
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	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
1302
cciss_scsi_user_command(ctlr_info_t *h, int hostno, char *buffer, int length)
L
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{
	int arg_len;

	if ((arg_len = is_keyword(buffer, length, "rescan")) != 0)
1307
		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;
1324
	ctlr_info_t *h;
1325
	int i;
L
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1327 1328
	h = (ctlr_info_t *) sh->hostdata[0];
	if (h == NULL)  /* This really shouldn't ever happen. */
L
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1329 1330 1331
		return -EINVAL;

	if (func == 0) {	/* User is reading from /proc/scsi/ciss*?/?*  */
1332
		buflen = sprintf(buffer, "cciss%d: SCSI host: %d\n",
1333
				h->ctlr, sh->host_no);
1334 1335 1336 1337 1338 1339 1340 1341 1342

		/* 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. */

1343 1344 1345
		for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++) {
			struct cciss_scsi_dev_t *sd =
				&ccissscsi[h->ctlr].dev[i];
1346 1347 1348 1349 1350 1351 1352 1353 1354
			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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		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*?/?*  ... */
1363
		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 
1369
   cciss command, c. */
L
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1371
static void cciss_scatter_gather(ctlr_info_t *h, CommandList_struct *c,
1372
	struct scsi_cmnd *cmd)
L
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1373
{
1374 1375
	unsigned int len;
	struct scatterlist *sg;
L
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1376
	__u64 addr64;
1377 1378 1379 1380 1381 1382 1383 1384
	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;
1385
	curr_sg = c->SG;
1386 1387 1388 1389 1390 1391 1392
	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;
1393
				curr_sg = sa->cmd_sg_list[c->cmdindex];
1394
			}
1395 1396
			addr64 = (__u64) sg_dma_address(sg);
			len  = sg_dma_len(sg);
1397 1398 1399 1400 1401 1402 1403
			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;
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		}
1405
		if (chained)
1406 1407
			cciss_map_sg_chain_block(h, c,
				sa->cmd_sg_list[c->cmdindex],
1408 1409
				(request_nsgs - (h->max_cmd_sgentries - 1)) *
					sizeof(SGDescriptor_struct));
1410
	}
1411 1412 1413
	/* track how many SG entries we are using */
	if (request_nsgs > h->maxSG)
		h->maxSG = request_nsgs;
1414
	c->Header.SGTotal = (u16) request_nsgs + chained;
1415
	if (request_nsgs > h->max_cmd_sgentries)
1416
		c->Header.SGList = h->max_cmd_sgentries;
1417
	else
1418
		c->Header.SGList = c->Header.SGTotal;
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	return;
}


static int
J
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1424
cciss_scsi_queue_command_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
L
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1425
{
1426 1427
	ctlr_info_t *h;
	int rc;
L
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1428
	unsigned char scsi3addr[8];
1429
	CommandList_struct *c;
L
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1430 1431 1432 1433
	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?)
1434
	h = (ctlr_info_t *) cmd->device->host->hostdata[0];
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1435

1436
	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. */

1451 1452 1453 1454
	spin_lock_irqsave(&h->lock, flags);
	c = scsi_cmd_alloc(h);
	spin_unlock_irqrestore(&h->lock, flags);
	if (c == NULL) {			/* trouble... */
1455
		dev_warn(&h->pdev->dev, "scsi_cmd_alloc returned NULL!\n");
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		/* 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 

1466 1467
	/* save c in case we have to abort it */
	cmd->host_scribble = (unsigned char *) c;
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1469 1470 1471 1472 1473
	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...

1477 1478 1479 1480 1481 1482 1483
	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)
	{
1486 1487 1488 1489 1490 1491 1492 1493 1494
	  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() )

1500
		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: 
1511
		dev_warn(&h->pdev->dev, "unknown data direction: %d\n",
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			cmd->sc_data_direction);
		BUG();
		break;
	}
1516 1517
	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)

1524
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. */

1532 1533
	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) {
1538
		spin_unlock_irqrestore(&h->lock, flags);
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		scsi_remove_host(sa->scsi_host);
		scsi_host_put(sa->scsi_host);
1541
		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;
1547 1548
	spin_unlock_irqrestore(&h->lock, flags);
	scsi_cmd_stack_free(h);
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	kfree(sa);
}

1552
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;

1558 1559
	spin_lock_irqsave(&h->lock, flags);
	sa = h->scsi_ctlr;
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	stk = &sa->cmd_stack; 

1562
	if (sa->registered) {
1563
		dev_info(&h->pdev->dev, "SCSI subsystem already engaged.\n");
1564
		spin_unlock_irqrestore(&h->lock, flags);
1565
		return -ENXIO;
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	}
1567
	sa->registered = 1;
1568 1569 1570
	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
1575
cciss_seq_tape_report(struct seq_file *seq, ctlr_info_t *h)
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{
	unsigned long flags;

1579
	CPQ_TAPE_LOCK(h, flags);
1580
	seq_printf(seq,
1581
		"Sequential access devices: %d\n\n",
1582 1583
			ccissscsi[h->ctlr].ndevices);
	CPQ_TAPE_UNLOCK(h, flags);
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}

1586 1587 1588 1589 1590 1591 1592 1593
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;

1594
	c = cmd_alloc(h);
1595
	if (!c) {
1596 1597
		dev_warn(&h->pdev->dev, "out of memory in "
			"wait_for_device_to_become_ready.\n");
1598 1599 1600 1601 1602 1603 1604 1605 1606
		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.
		 */
1607
		schedule_timeout_uninterruptible(waittime);
1608 1609 1610 1611 1612 1613 1614
		count++;

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

		/* Send the Test Unit Ready */
1615
		rc = fill_cmd(h, c, TEST_UNIT_READY, NULL, 0, 0,
1616
			lunaddr, TYPE_CMD);
1617 1618 1619 1620
		if (rc == 0)
			rc = sendcmd_withirq_core(h, c, 0);

		(void) process_sendcmd_error(h, c);
1621

1622 1623
		if (rc != 0)
			goto retry_tur;
1624

1625
		if (c->err_info->CommandStatus == CMD_SUCCESS)
1626 1627
			break;

1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640
		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:
1641
		dev_warn(&h->pdev->dev, "Waiting %d secs "
1642
			"for device to become ready.\n",
1643
			waittime / HZ);
1644 1645 1646 1647
		rc = 1; /* device not ready. */
	}

	if (rc)
1648
		dev_warn(&h->pdev->dev, "giving up on device.\n");
1649
	else
1650
		dev_warn(&h->pdev->dev, "device is ready.\n");
1651

1652
	cmd_free(h, c);
1653 1654
	return rc;
}
1655

1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670
/* 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;
1671
	unsigned char lunaddr[8];
1672
	ctlr_info_t *h;
1673 1674

	/* find the controller to which the command to be aborted was sent */
1675 1676
	h = (ctlr_info_t *) scsicmd->device->host->hostdata[0];
	if (h == NULL) /* paranoia */
1677
		return FAILED;
1678
	dev_warn(&h->pdev->dev, "resetting tape drive or medium changer.\n");
1679 1680
	/* find the command that's giving us trouble */
	cmd_in_trouble = (CommandList_struct *) scsicmd->host_scribble;
1681
	if (cmd_in_trouble == NULL) /* paranoia */
1682
		return FAILED;
1683
	memcpy(lunaddr, &cmd_in_trouble->Header.LUN.LunAddrBytes[0], 8);
1684
	/* send a reset to the SCSI LUN which the command was sent to */
1685
	rc = sendcmd_withirq(h, CCISS_RESET_MSG, NULL, 0, 0, lunaddr,
1686
		TYPE_MSG);
1687
	if (rc == 0 && wait_for_device_to_become_ready(h, lunaddr) == 0)
1688
		return SUCCESS;
1689
	dev_warn(&h->pdev->dev, "resetting device failed.\n");
1690 1691 1692 1693 1694 1695 1696
	return FAILED;
}

static int  cciss_eh_abort_handler(struct scsi_cmnd *scsicmd)
{
	int rc;
	CommandList_struct *cmd_to_abort;
1697
	unsigned char lunaddr[8];
1698
	ctlr_info_t *h;
1699 1700

	/* find the controller to which the command to be aborted was sent */
1701 1702
	h = (ctlr_info_t *) scsicmd->device->host->hostdata[0];
	if (h == NULL) /* paranoia */
1703
		return FAILED;
1704
	dev_warn(&h->pdev->dev, "aborting tardy SCSI cmd\n");
1705 1706 1707 1708 1709

	/* find the command to be aborted */
	cmd_to_abort = (CommandList_struct *) scsicmd->host_scribble;
	if (cmd_to_abort == NULL) /* paranoia */
		return FAILED;
1710
	memcpy(lunaddr, &cmd_to_abort->Header.LUN.LunAddrBytes[0], 8);
1711
	rc = sendcmd_withirq(h, CCISS_ABORT_MSG, &cmd_to_abort->Header.Tag,
1712
		0, 0, lunaddr, TYPE_MSG);
1713 1714 1715 1716 1717 1718
	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)
1724
#define cciss_engage_scsi(h)
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#endif /* CONFIG_CISS_SCSI_TAPE */