megaraid.c

linux 内核源代码

 * Free a SCB structure
 * Note: We assume the scsi commands associated with this scb is not free yet.
 */
static void
mega_free_scb(adapter_t *adapter, scb_t *scb)
{
	switch( scb->dma_type ) {

	case MEGA_DMA_TYPE_NONE:
		break;

	case MEGA_SGLIST:
		scsi_dma_unmap(scb->cmd);
		break;
	default:
		break;
	}

	/*
	 * Remove from the pending list
	 */
	list_del_init(&scb->list);

	/* Link the scb back into free list */
	scb->state = SCB_FREE;
	scb->cmd = NULL;

	list_add(&scb->list, &adapter->free_list);
}


static int
__mega_busywait_mbox (adapter_t *adapter)
{
	volatile mbox_t *mbox = adapter->mbox;
	long counter;

	for (counter = 0; counter < 10000; counter++) {
		if (!mbox->m_in.busy)
			return 0;
		udelay(100);
		cond_resched();
	}
	return -1;		/* give up after 1 second */
}

/*
 * Copies data to SGLIST
 * Note: For 64 bit cards, we need a minimum of one SG element for read/write
 */
static int
mega_build_sglist(adapter_t *adapter, scb_t *scb, u32 *buf, u32 *len)
{
	struct scatterlist *sg;
	Scsi_Cmnd	*cmd;
	int	sgcnt;
	int	idx;

	cmd = scb->cmd;

	/*
	 * Copy Scatter-Gather list info into controller structure.
	 *
	 * The number of sg elements returned must not exceed our limit
	 */
	sgcnt = scsi_dma_map(cmd);

	scb->dma_type = MEGA_SGLIST;

	BUG_ON(sgcnt > adapter->sglen || sgcnt < 0);

	*len = 0;

	if (scsi_sg_count(cmd) == 1 && !adapter->has_64bit_addr) {
		sg = scsi_sglist(cmd);
		scb->dma_h_bulkdata = sg_dma_address(sg);
		*buf = (u32)scb->dma_h_bulkdata;
		*len = sg_dma_len(sg);
		return 0;
	}

	scsi_for_each_sg(cmd, sg, sgcnt, idx) {
		if (adapter->has_64bit_addr) {
			scb->sgl64[idx].address = sg_dma_address(sg);
			*len += scb->sgl64[idx].length = sg_dma_len(sg);
		} else {
			scb->sgl[idx].address = sg_dma_address(sg);
			*len += scb->sgl[idx].length = sg_dma_len(sg);
		}
	}

	/* Reset pointer and length fields */
	*buf = scb->sgl_dma_addr;

	/* Return count of SG requests */
	return sgcnt;
}


/*
 * mega_8_to_40ld()
 *
 * takes all info in AdapterInquiry structure and puts it into ProductInfo and
 * Enquiry3 structures for later use
 */
static void
mega_8_to_40ld(mraid_inquiry *inquiry, mega_inquiry3 *enquiry3,
		mega_product_info *product_info)
{
	int i;

	product_info->max_commands = inquiry->adapter_info.max_commands;
	enquiry3->rebuild_rate = inquiry->adapter_info.rebuild_rate;
	product_info->nchannels = inquiry->adapter_info.nchannels;

	for (i = 0; i < 4; i++) {
		product_info->fw_version[i] =
			inquiry->adapter_info.fw_version[i];

		product_info->bios_version[i] =
			inquiry->adapter_info.bios_version[i];
	}
	enquiry3->cache_flush_interval =
		inquiry->adapter_info.cache_flush_interval;

	product_info->dram_size = inquiry->adapter_info.dram_size;

	enquiry3->num_ldrv = inquiry->logdrv_info.num_ldrv;

	for (i = 0; i < MAX_LOGICAL_DRIVES_8LD; i++) {
		enquiry3->ldrv_size[i] = inquiry->logdrv_info.ldrv_size[i];
		enquiry3->ldrv_prop[i] = inquiry->logdrv_info.ldrv_prop[i];
		enquiry3->ldrv_state[i] = inquiry->logdrv_info.ldrv_state[i];
	}

	for (i = 0; i < (MAX_PHYSICAL_DRIVES); i++)
		enquiry3->pdrv_state[i] = inquiry->pdrv_info.pdrv_state[i];
}

static inline void
mega_free_sgl(adapter_t *adapter)
{
	scb_t	*scb;
	int	i;

	for(i = 0; i < adapter->max_cmds; i++) {

		scb = &adapter->scb_list[i];

		if( scb->sgl64 ) {
			pci_free_consistent(adapter->dev,
				sizeof(mega_sgl64) * adapter->sglen,
				scb->sgl64,
				scb->sgl_dma_addr);

			scb->sgl64 = NULL;
		}

		if( scb->pthru ) {
			pci_free_consistent(adapter->dev, sizeof(mega_passthru),
				scb->pthru, scb->pthru_dma_addr);

			scb->pthru = NULL;
		}

		if( scb->epthru ) {
			pci_free_consistent(adapter->dev,
				sizeof(mega_ext_passthru),
				scb->epthru, scb->epthru_dma_addr);

			scb->epthru = NULL;
		}

	}
}


/*
 * Get information about the card/driver
 */
const char *
megaraid_info(struct Scsi_Host *host)
{
	static char buffer[512];
	adapter_t *adapter;

	adapter = (adapter_t *)host->hostdata;

	sprintf (buffer,
		 "LSI Logic MegaRAID %s %d commands %d targs %d chans %d luns",
		 adapter->fw_version, adapter->product_info.max_commands,
		 adapter->host->max_id, adapter->host->max_channel,
		 adapter->host->max_lun);
	return buffer;
}

/*
 * Abort a previous SCSI request. Only commands on the pending list can be
 * aborted. All the commands issued to the F/W must complete.
 */
static int
megaraid_abort(Scsi_Cmnd *cmd)
{
	adapter_t	*adapter;
	int		rval;

	adapter = (adapter_t *)cmd->device->host->hostdata;

	rval =  megaraid_abort_and_reset(adapter, cmd, SCB_ABORT);

	/*
	 * This is required here to complete any completed requests
	 * to be communicated over to the mid layer.
	 */
	mega_rundoneq(adapter);

	return rval;
}


static int
megaraid_reset(struct scsi_cmnd *cmd)
{
	adapter_t	*adapter;
	megacmd_t	mc;
	int		rval;

	adapter = (adapter_t *)cmd->device->host->hostdata;

#if MEGA_HAVE_CLUSTERING
	mc.cmd = MEGA_CLUSTER_CMD;
	mc.opcode = MEGA_RESET_RESERVATIONS;

	if( mega_internal_command(adapter, &mc, NULL) != 0 ) {
		printk(KERN_WARNING
				"megaraid: reservation reset failed.\n");
	}
	else {
		printk(KERN_INFO "megaraid: reservation reset.\n");
	}
#endif

	spin_lock_irq(&adapter->lock);

	rval =  megaraid_abort_and_reset(adapter, cmd, SCB_RESET);

	/*
	 * This is required here to complete any completed requests
	 * to be communicated over to the mid layer.
	 */
	mega_rundoneq(adapter);
	spin_unlock_irq(&adapter->lock);

	return rval;
}

/**
 * megaraid_abort_and_reset()
 * @adapter - megaraid soft state
 * @cmd - scsi command to be aborted or reset
 * @aor - abort or reset flag
 *
 * Try to locate the scsi command in the pending queue. If found and is not
 * issued to the controller, abort/reset it. Otherwise return failure
 */
static int
megaraid_abort_and_reset(adapter_t *adapter, Scsi_Cmnd *cmd, int aor)
{
	struct list_head	*pos, *next;
	scb_t			*scb;

	printk(KERN_WARNING "megaraid: %s-%lx cmd=%x <c=%d t=%d l=%d>\n",
	     (aor == SCB_ABORT)? "ABORTING":"RESET", cmd->serial_number,
	     cmd->cmnd[0], cmd->device->channel, 
	     cmd->device->id, cmd->device->lun);

	if(list_empty(&adapter->pending_list))
		return FALSE;

	list_for_each_safe(pos, next, &adapter->pending_list) {

		scb = list_entry(pos, scb_t, list);

		if (scb->cmd == cmd) { /* Found command */

			scb->state |= aor;

			/*
			 * Check if this command has firmare owenership. If
			 * yes, we cannot reset this command. Whenever, f/w
			 * completes this command, we will return appropriate
			 * status from ISR.
			 */
			if( scb->state & SCB_ISSUED ) {

				printk(KERN_WARNING
					"megaraid: %s-%lx[%x], fw owner.\n",
					(aor==SCB_ABORT) ? "ABORTING":"RESET",
					cmd->serial_number, scb->idx);

				return FALSE;
			}
			else {

				/*
				 * Not yet issued! Remove from the pending
				 * list
				 */
				printk(KERN_WARNING
					"megaraid: %s-%lx[%x], driver owner.\n",
					(aor==SCB_ABORT) ? "ABORTING":"RESET",
					cmd->serial_number, scb->idx);

				mega_free_scb(adapter, scb);

				if( aor == SCB_ABORT ) {
					cmd->result = (DID_ABORT << 16);
				}
				else {
					cmd->result = (DID_RESET << 16);
				}

				list_add_tail(SCSI_LIST(cmd),
						&adapter->completed_list);

				return TRUE;
			}
		}
	}

	return FALSE;
}

static inline int
make_local_pdev(adapter_t *adapter, struct pci_dev **pdev)
{
	*pdev = alloc_pci_dev();

	if( *pdev == NULL ) return -1;

	memcpy(*pdev, adapter->dev, sizeof(struct pci_dev));

	if( pci_set_dma_mask(*pdev, DMA_32BIT_MASK) != 0 ) {
		kfree(*pdev);
		return -1;
	}

	return 0;
}

static inline void
free_local_pdev(struct pci_dev *pdev)
{
	kfree(pdev);
}

/**
 * mega_allocate_inquiry()
 * @dma_handle - handle returned for dma address
 * @pdev - handle to pci device
 *
 * allocates memory for inquiry structure
 */
static inline void *
mega_allocate_inquiry(dma_addr_t *dma_handle, struct pci_dev *pdev)
{
	return pci_alloc_consistent(pdev, sizeof(mega_inquiry3), dma_handle);
}


static inline void
mega_free_inquiry(void *inquiry, dma_addr_t dma_handle, struct pci_dev *pdev)
{
	pci_free_consistent(pdev, sizeof(mega_inquiry3), inquiry, dma_handle);
}


#ifdef CONFIG_PROC_FS
/* Following code handles /proc fs  */

#define CREATE_READ_PROC(string, func)	create_proc_read_entry(string,	\
					S_IRUSR | S_IFREG,		\
					controller_proc_dir_entry,	\
					func, adapter)

/**
 * mega_create_proc_entry()
 * @index - index in soft state array
 * @parent - parent node for this /proc entry
 *
 * Creates /proc entries for our controllers.
 */
static void
mega_create_proc_entry(int index, struct proc_dir_entry *parent)
{
	struct proc_dir_entry	*controller_proc_dir_entry = NULL;
	u8		string[64] = { 0 };
	adapter_t	*adapter = hba_soft_state[index];

	sprintf(string, "hba%d", adapter->host->host_no);

	controller_proc_dir_entry =
		adapter->controller_proc_dir_entry = proc_mkdir(string, parent);

	if(!controller_proc_dir_entry) {
		printk(KERN_WARNING "\nmegaraid: proc_mkdir failed\n");
		return;
	}
	adapter->proc_read = CREATE_READ_PROC("config", proc_read_config);
	adapter->proc_stat = CREATE_READ_PROC("stat", proc_read_stat);
	adapter->proc_mbox = CREATE_READ_PROC("mailbox", proc_read_mbox);
#if MEGA_HAVE_ENH_PROC
	adapter->proc_rr = CREATE_READ_PROC("rebuild-rate", proc_rebuild_rate);
	adapter->proc_battery = CREATE_READ_PROC("battery-status",
			proc_battery);

	/*
	 * Display each physical drive on its channel
	 */
	adapter->proc_pdrvstat[0] = CREATE_READ_PROC("diskdrives-ch0",
					proc_pdrv_ch0);
	adapter->proc_pdrvstat[1] = CREATE_READ_PROC("diskdrives-ch1",
					proc_pdrv_ch1);
	adapter->proc_pdrvstat[2] = CREATE_READ_PROC("diskdrives-ch2",
					proc_pdrv_ch2);
	adapter->proc_pdrvstat[3] = CREATE_READ_PROC("diskdrives-ch3",
					proc_pdrv_ch3);

	/*
	 * Display a set of up to 10 logical drive through each of following
	 * /proc entries
	 */
	adapter->proc_rdrvstat[0] = CREATE_READ_PROC("raiddrives-0-9",
					proc_rdrv_10);
	adapter->proc_rdrvstat[1] = CREATE_READ_PROC("raiddrives-10-19",
					proc_rdrv_20);
	adapter->proc_rdrvstat[2] = CREATE_READ_PROC("raiddrives-20-29",
					proc_rdrv_30);
	adapter->proc_rdrvstat[3] = CREATE_READ_PROC("raiddrives-30-39",
					proc_rdrv_40);
#endif
}


/**
 * proc_read_config()
 * @page - buffer to write the data in
 * @start - where the actual data has been written in page
 * @offset - same meaning as the read system call
 * @count - same meaning as the read system call
 * @eof - set if no more data needs to be returned
 * @data - pointer to our soft state
 *
 * Display configuration information about the controller.
 */
static int
proc_read_config(char *page, char **start, off_t offset, int count, int *eof,
		void *data)
{

	adapter_t *adapter = (adapter_t *)data;
	int len = 0;

	len += sprintf(page+len, "%s", MEGARAID_VERSION);

	if(adapter->product_info.product_name[0])
		len += sprintf(page+len, "%s\n",
				adapter->product_info.product_name);

	len += sprintf(page+len, "Controller Type: ");

	if( adapter->flag & BOARD_MEMMAP ) {
		len += sprintf(page+len,
			"438/466/467/471/493/518/520/531/532\n");
	}
	else {
		len += sprintf(page+len,
			"418/428/434\n");
	}

	if(adapter->flag & BOARD_40LD) {
		len += sprintf(page+len,
				"Controller Supports 40 Logical Drives\n");
	}

	if(adapter->flag & BOARD_64BIT) {
		len += sprintf(page+len,
		"Controller capable of 64-bit memory addressing\n");
	}
	if( adapter->has_64bit_addr ) {
		len += sprintf(page+len,
			"Controller using 64-bit memory addressing\n");
	}
	else {
		len += sprintf(page+len,
			"Controller is not using 64-bit memory addressing\n");
	}

	len += sprintf(page+len, "Base = %08lx, Irq = %d, ", adapter->base,
			adapter->host->irq);

	len += sprintf(page+len, "Logical Drives = %d, Channels = %d\n",
			adapter->numldrv, adapter->product_info.nchannels);

	len += sprintf(page+len, "Version =%s:%s, DRAM = %dMb\n",
			adapter->fw_version, adapter->bios_version,
			adapter->product_info.dram_size);

	len += sprintf(page+len,
		"Controller Queue Depth = %d, Driver Queue Depth = %d\n",
		adapter->product_info.max_commands, adapter->max_cmds);

	len += sprintf(page+len, "support_ext_cdb    = %d\n",
			adapter->support_ext_cdb);
	len += sprintf(page+len, "support_random_del = %d\n",
			adapter->support_random_del);
	len += sprintf(page+len, "boot_ldrv_enabled  = %d\n",
			adapter->boot_ldrv_enabled);
	len += sprintf(page+len, "boot_ldrv          = %d\n",
			adapter->boot_ldrv);
	len += sprintf(page+len, "boot_pdrv_enabled  = %d\n",
			adapter->boot_pdrv_enabled);
	len += sprintf(page+len, "boot_pdrv_ch       = %d\n",
			adapter->boot_pdrv_ch);
	len += sprintf(page+len, "boot_pdrv_tgt      = %d\n",
			adapter->boot_pdrv_tgt);
	len += sprintf(page+len, "quiescent          = %d\n",
			atomic_read(&adapter->quiescent));
	len += sprintf(page+len, "has_cluster        = %d\n",
			adapter->has_cluster);

	len += sprintf(page+len, "\nModule Parameters:\n");
	len += sprintf(page+len, "max_cmd_per_lun    = %d\n",
			max_cmd_per_lun);
	len += sprintf(page+len, "max_sectors_per_io = %d\n",
			max_sectors_per_io);

	*eof = 1;

	return len;
}



/**
 * proc_read_stat()
 * @page - buffer to write the data in
 * @start - where the actual data has been written in page
 * @offset - same meaning as the read system call
 * @count - same meaning as the read system call
 * @eof - set if no more data needs to be returned
 * @data - pointer to our soft state
 *
 * Diaplay statistical information about the I/O activity.
 */
static int
proc_read_stat(char *page, char **start, off_t offset, int count, int *eof,
		void *data)
{
	adapter_t	*adapter;