cciss.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 2,278 行 · 第 1/5 页

/*
 *    Disk Array driver for HP SA 5xxx and 6xxx Controllers
 *    Copyright 2000, 2002 Hewlett-Packard Development Company, L.P.
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *    NON INFRINGEMENT.  See the GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *    Questions/Comments/Bugfixes to [e-mail]
 *
 */

#include <linux/config.h>	/* CONFIG_PROC_FS */
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/major.h>
#include <linux/fs.h>
#include <linux/bio.h>
#include <linux/blkpg.h>
#include <linux/timer.h>
#include <linux/proc_fs.h>
#include <linux/init.h> 
#include <linux/hdreg.h>
#include <linux/spinlock.h>
#include <linux/compat.h>
#include <asm/uaccess.h>
#include <asm/io.h>

#include <linux/blkdev.h>
#include <linux/genhd.h>
#include <linux/completion.h>

#define CCISS_DRIVER_VERSION(maj,min,submin) ((maj<<16)|(min<<8)|(submin))
#define DRIVER_NAME "HP CISS Driver (v 2.6.2)"
#define DRIVER_VERSION CCISS_DRIVER_VERSION(2,6,2)

/* Embedded module documentation macros - see modules.h */
MODULE_AUTHOR("Hewlett-Packard Company");
MODULE_DESCRIPTION("Driver for HP Controller SA5xxx SA6xxx version 2.6.2");
MODULE_SUPPORTED_DEVICE("HP SA5i SA5i+ SA532 SA5300 SA5312 SA641 SA642 SA6400"
			" SA6i V100");
MODULE_LICENSE("GPL");

#include "cciss_cmd.h"
#include "cciss.h"
#include <linux/cciss_ioctl.h>

/* define the PCI info for the cards we can control */
const struct pci_device_id cciss_pci_device_id[] = {
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISS,
			0x0E11, 0x4070, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSB,
                        0x0E11, 0x4080, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSB,
                        0x0E11, 0x4082, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSB,
                        0x0E11, 0x4083, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC,
		0x0E11, 0x409A, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC,
		0x0E11, 0x409B, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC,
		0x0E11, 0x409C, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC,
		0x0E11, 0x409D, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC,
		0x0E11, 0x4091, 0, 0, 0},
	{ PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_CISSC,
		0x0E11, 0x409E, 0, 0, 0},
	{ PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_CISS,
		0x103C, 0x3211, 0, 0, 0},
	{0,}
};
MODULE_DEVICE_TABLE(pci, cciss_pci_device_id);

#define NR_PRODUCTS (sizeof(products)/sizeof(struct board_type))

/*  board_id = Subsystem Device ID & Vendor ID
 *  product = Marketing Name for the board
 *  access = Address of the struct of function pointers 
 */
static struct board_type products[] = {
	{ 0x40700E11, "Smart Array 5300", &SA5_access },
	{ 0x40800E11, "Smart Array 5i", &SA5B_access},
	{ 0x40820E11, "Smart Array 532", &SA5B_access},
	{ 0x40830E11, "Smart Array 5312", &SA5B_access},
	{ 0x409A0E11, "Smart Array 641", &SA5_access},
	{ 0x409B0E11, "Smart Array 642", &SA5_access},
	{ 0x409C0E11, "Smart Array 6400", &SA5_access},
	{ 0x409D0E11, "Smart Array 6400 EM", &SA5_access},
	{ 0x40910E11, "Smart Array 6i", &SA5_access},
	{ 0x409E0E11, "Smart Array 6422", &SA5_access},
	{ 0x3211103C, "Smart Array V100", &SA5_access},
};

/* How long to wait (in millesconds) for board to go into simple mode */
#define MAX_CONFIG_WAIT 30000 
#define MAX_IOCTL_CONFIG_WAIT 1000

/*define how many times we will try a command because of bus resets */
#define MAX_CMD_RETRIES 3

#define READ_AHEAD 	 1024
#define NR_CMDS		 384 /* #commands that can be outstanding */
#define MAX_CTLR 8

#define CCISS_DMA_MASK	0xFFFFFFFF	/* 32 bit DMA */

static ctlr_info_t *hba[MAX_CTLR];

static void do_cciss_request(request_queue_t *q);
static int cciss_open(struct inode *inode, struct file *filep);
static int cciss_release(struct inode *inode, struct file *filep);
static int cciss_ioctl(struct inode *inode, struct file *filep, 
		unsigned int cmd, unsigned long arg);

static int revalidate_allvol(ctlr_info_t *host);
static int cciss_revalidate(struct gendisk *disk);
static int deregister_disk(struct gendisk *disk);
static int register_new_disk(ctlr_info_t *h);

static void cciss_getgeometry(int cntl_num);

static void start_io( ctlr_info_t *h);
static int sendcmd( __u8 cmd, int ctlr, void *buff, size_t size,
	unsigned int use_unit_num, unsigned int log_unit, __u8 page_code,
	unsigned char *scsi3addr, int cmd_type);

#ifdef CONFIG_PROC_FS
static int cciss_proc_get_info(char *buffer, char **start, off_t offset, 
		int length, int *eof, void *data);
static void cciss_procinit(int i);
#else
static void cciss_procinit(int i) {}
#endif /* CONFIG_PROC_FS */

static struct block_device_operations cciss_fops  = {
	.owner		= THIS_MODULE,
	.open		= cciss_open, 
	.release       	= cciss_release,
        .ioctl		= cciss_ioctl,
	.revalidate_disk= cciss_revalidate,
};

/*
 * Enqueuing and dequeuing functions for cmdlists.
 */
static inline void addQ(CommandList_struct **Qptr, CommandList_struct *c)
{
        if (*Qptr == NULL) {
                *Qptr = c;
                c->next = c->prev = c;
        } else {
                c->prev = (*Qptr)->prev;
                c->next = (*Qptr);
                (*Qptr)->prev->next = c;
                (*Qptr)->prev = c;
        }
}

static inline CommandList_struct *removeQ(CommandList_struct **Qptr, 
						CommandList_struct *c)
{
        if (c && c->next != c) {
                if (*Qptr == c) *Qptr = c->next;
                c->prev->next = c->next;
                c->next->prev = c->prev;
        } else {
                *Qptr = NULL;
        }
        return c;
}
#ifdef CONFIG_PROC_FS

#include "cciss_scsi.c"		/* For SCSI tape support */

/*
 * Report information about this controller.
 */
#define ENG_GIG 1000000000
#define ENG_GIG_FACTOR (ENG_GIG/512)
#define RAID_UNKNOWN 6
static const char *raid_label[] = {"0","4","1(1+0)","5","5+1","ADG",
	                                   "UNKNOWN"};

static struct proc_dir_entry *proc_cciss;

static int cciss_proc_get_info(char *buffer, char **start, off_t offset, 
		int length, int *eof, void *data)
{
        off_t pos = 0;
        off_t len = 0;
        int size, i, ctlr;
        ctlr_info_t *h = (ctlr_info_t*)data;
        drive_info_struct *drv;
	unsigned long flags;
        sector_t vol_sz, vol_sz_frac;

        ctlr = h->ctlr;

	/* prevent displaying bogus info during configuration
	 * or deconfiguration of a logical volume
	 */
	spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
	if (h->busy_configuring) {
		spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
	return -EBUSY;
	}
	h->busy_configuring = 1;
	spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);

        size = sprintf(buffer, "%s: HP %s Controller\n"
		"Board ID: 0x%08lx\n"
		"Firmware Version: %c%c%c%c\n"
		"IRQ: %d\n"
		"Logical drives: %d\n"
		"Current Q depth: %d\n"
		"Current # commands on controller: %d\n"
		"Max Q depth since init: %d\n"
		"Max # commands on controller since init: %d\n"
		"Max SG entries since init: %d\n\n",
                h->devname,
                h->product_name,
                (unsigned long)h->board_id,
		h->firm_ver[0], h->firm_ver[1], h->firm_ver[2], h->firm_ver[3],
                (unsigned int)h->intr,
                h->num_luns, 
		h->Qdepth, h->commands_outstanding,
		h->maxQsinceinit, h->max_outstanding, h->maxSG);

        pos += size; len += size;
	cciss_proc_tape_report(ctlr, buffer, &pos, &len);
	for(i=0; i<=h->highest_lun; i++) {

                drv = &h->drv[i];
		if (drv->block_size == 0)
			continue;

		vol_sz = drv->nr_blocks;
		vol_sz_frac = sector_div(vol_sz, ENG_GIG_FACTOR);
		vol_sz_frac *= 100;
		sector_div(vol_sz_frac, ENG_GIG_FACTOR);

		if (drv->raid_level > 5)
			drv->raid_level = RAID_UNKNOWN;
		size = sprintf(buffer+len, "cciss/c%dd%d:"
				"\t%4u.%02uGB\tRAID %s\n",
				ctlr, i, (int)vol_sz, (int)vol_sz_frac,
				raid_label[drv->raid_level]);
                pos += size; len += size;
        }

        *eof = 1;
        *start = buffer+offset;
        len -= offset;
        if (len>length)
                len = length;
	h->busy_configuring = 0;
        return len;
}

static int 
cciss_proc_write(struct file *file, const char __user *buffer, 
			unsigned long count, void *data)
{
	unsigned char cmd[80];
	int len;
#ifdef CONFIG_CISS_SCSI_TAPE
	ctlr_info_t *h = (ctlr_info_t *) data;
	int rc;
#endif

	if (count > sizeof(cmd)-1) return -EINVAL;
	if (copy_from_user(cmd, buffer, count)) return -EFAULT;
	cmd[count] = '\0';
	len = strlen(cmd);	// above 3 lines ensure safety
	if (cmd[len-1] == '\n') 
		cmd[--len] = '\0';
#	ifdef CONFIG_CISS_SCSI_TAPE
		if (strcmp("engage scsi", cmd)==0) {
			rc = cciss_engage_scsi(h->ctlr);
			if (rc != 0) return -rc;
			return count;
		}
		/* might be nice to have "disengage" too, but it's not 
		   safely possible. (only 1 module use count, lock issues.) */
#	endif
	return -EINVAL;
}

/*
 * Get us a file in /proc/cciss that says something about each controller.
 * Create /proc/cciss if it doesn't exist yet.
 */
static void __devinit cciss_procinit(int i)
{
	struct proc_dir_entry *pde;

        if (proc_cciss == NULL) {
                proc_cciss = proc_mkdir("cciss", proc_root_driver);
                if (!proc_cciss) 
			return;
        }

	pde = create_proc_read_entry(hba[i]->devname, 
		S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH, 
		proc_cciss, cciss_proc_get_info, hba[i]);
	pde->write_proc = cciss_proc_write;
}
#endif /* CONFIG_PROC_FS */

/* 
 * For operations that cannot sleep, a command block is allocated at init, 
 * and managed by cmd_alloc() and cmd_free() using a simple bitmap to track
 * which ones are free or in use.  For operations that can wait for kmalloc 
 * to possible sleep, this routine can be called with get_from_pool set to 0. 
 * cmd_free() MUST be called with a got_from_pool set to 0 if cmd_alloc was. 
 */ 
static CommandList_struct * cmd_alloc(ctlr_info_t *h, int get_from_pool)
{
	CommandList_struct *c;
	int i; 
	u64bit temp64;
	dma_addr_t cmd_dma_handle, err_dma_handle;

	if (!get_from_pool)
	{
		c = (CommandList_struct *) pci_alloc_consistent(
			h->pdev, sizeof(CommandList_struct), &cmd_dma_handle); 
        	if(c==NULL)
                 	return NULL;
		memset(c, 0, sizeof(CommandList_struct));

		c->err_info = (ErrorInfo_struct *)pci_alloc_consistent(
					h->pdev, sizeof(ErrorInfo_struct), 
					&err_dma_handle);
	
		if (c->err_info == NULL)
		{
			pci_free_consistent(h->pdev, 
				sizeof(CommandList_struct), c, cmd_dma_handle);
			return NULL;
		}
		memset(c->err_info, 0, sizeof(ErrorInfo_struct));
	} else /* get it out of the controllers pool */ 
	{
	     	do {
                	i = find_first_zero_bit(h->cmd_pool_bits, NR_CMDS);
                        if (i == NR_CMDS)
                                return NULL;
                } while(test_and_set_bit(i & (BITS_PER_LONG - 1), h->cmd_pool_bits+(i/BITS_PER_LONG)) != 0);
#ifdef CCISS_DEBUG
		printk(KERN_DEBUG "cciss: using command buffer %d\n", i);
#endif
                c = h->cmd_pool + i;
		memset(c, 0, sizeof(CommandList_struct));
		cmd_dma_handle = h->cmd_pool_dhandle 
					+ i*sizeof(CommandList_struct);
		c->err_info = h->errinfo_pool + i;
		memset(c->err_info, 0, sizeof(ErrorInfo_struct));
		err_dma_handle = h->errinfo_pool_dhandle 
					+ i*sizeof(ErrorInfo_struct);
                h->nr_allocs++;
        }

	c->busaddr = (__u32) cmd_dma_handle;
	temp64.val = (__u64) err_dma_handle;	
	c->ErrDesc.Addr.lower = temp64.val32.lower;
	c->ErrDesc.Addr.upper = temp64.val32.upper;
	c->ErrDesc.Len = sizeof(ErrorInfo_struct);
	
	c->ctlr = h->ctlr;
        return c;


}

/* 
 * Frees a command block that was previously allocated with cmd_alloc(). 
 */
static void cmd_free(ctlr_info_t *h, CommandList_struct *c, int got_from_pool)
{
	int i;
	u64bit temp64;

	if( !got_from_pool)
	{ 
		temp64.val32.lower = c->ErrDesc.Addr.lower;
		temp64.val32.upper = c->ErrDesc.Addr.upper;
		pci_free_consistent(h->pdev, sizeof(ErrorInfo_struct), 
			c->err_info, (dma_addr_t) temp64.val);
		pci_free_consistent(h->pdev, sizeof(CommandList_struct), 
			c, (dma_addr_t) c->busaddr);
	} else 
	{
		i = c - h->cmd_pool;
		clear_bit(i&(BITS_PER_LONG-1), h->cmd_pool_bits+(i/BITS_PER_LONG));
                h->nr_frees++;
        }
}

static inline ctlr_info_t *get_host(struct gendisk *disk)
{
	return disk->queue->queuedata; 
}

static inline drive_info_struct *get_drv(struct gendisk *disk)
{
	return disk->private_data;
}

/*
 * Open.  Make sure the device is really there.
 */
static int cciss_open(struct inode *inode, struct file *filep)
{
	ctlr_info_t *host = get_host(inode->i_bdev->bd_disk);
	drive_info_struct *drv = get_drv(inode->i_bdev->bd_disk);

#ifdef CCISS_DEBUG
	printk(KERN_DEBUG "cciss_open %s\n", inode->i_bdev->bd_disk->disk_name);
#endif /* CCISS_DEBUG */ 

	/*
	 * Root is allowed to open raw volume zero even if it's not configured
	 * so array config can still work.  I don't think I really like this,
	 * but I'm already using way to many device nodes to claim another one
	 * for "raw controller".
	 */
	if (drv->nr_blocks == 0) {
		if (iminor(inode) != 0)
			return -ENXIO;
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
	}
	drv->usage_count++;
	host->usage_count++;
	return 0;
}
/*
 * Close.  Sync first.