lpfc_attr.c

linux-2.6.15.6

*/
LPFC_ATTR_R(lun_queue_depth, 30, 1, 128,
	    "Max number of FCP commands we can queue to a specific LUN");

/*
# Some disk devices have a "select ID" or "select Target" capability.
# From a protocol standpoint "select ID" usually means select the
# Fibre channel "ALPA".  In the FC-AL Profile there is an "informative
# annex" which contains a table that maps a "select ID" (a number
# between 0 and 7F) to an ALPA.  By default, for compatibility with
# older drivers, the lpfc driver scans this table from low ALPA to high
# ALPA.
#
# Turning on the scan-down variable (on  = 1, off = 0) will
# cause the lpfc driver to use an inverted table, effectively
# scanning ALPAs from high to low. Value range is [0,1]. Default value is 1.
#
# (Note: This "select ID" functionality is a LOOP ONLY characteristic
# and will not work across a fabric. Also this parameter will take
# effect only in the case when ALPA map is not available.)
*/
LPFC_ATTR_R(scan_down, 1, 0, 1,
	     "Start scanning for devices from highest ALPA to lowest");

/*
# lpfc_nodev_tmo: If set, it will hold all I/O errors on devices that disappear
# until the timer expires. Value range is [0,255]. Default value is 30.
# NOTE: this MUST be less then the SCSI Layer command timeout - 1.
*/
LPFC_ATTR_RW(nodev_tmo, 30, 0, 255,
	     "Seconds driver will hold I/O waiting for a device to come back");

/*
# lpfc_topology:  link topology for init link
#            0x0  = attempt loop mode then point-to-point
#            0x02 = attempt point-to-point mode only
#            0x04 = attempt loop mode only
#            0x06 = attempt point-to-point mode then loop
# Set point-to-point mode if you want to run as an N_Port.
# Set loop mode if you want to run as an NL_Port. Value range is [0,0x6].
# Default value is 0.
*/
LPFC_ATTR_R(topology, 0, 0, 6, "Select Fibre Channel topology");

/*
# lpfc_link_speed: Link speed selection for initializing the Fibre Channel
# connection.
#       0  = auto select (default)
#       1  = 1 Gigabaud
#       2  = 2 Gigabaud
#       4  = 4 Gigabaud
# Value range is [0,4]. Default value is 0.
*/
LPFC_ATTR_R(link_speed, 0, 0, 4, "Select link speed");

/*
# lpfc_fcp_class:  Determines FC class to use for the FCP protocol.
# Value range is [2,3]. Default value is 3.
*/
LPFC_ATTR_R(fcp_class, 3, 2, 3,
	     "Select Fibre Channel class of service for FCP sequences");

/*
# lpfc_use_adisc: Use ADISC for FCP rediscovery instead of PLOGI. Value range
# is [0,1]. Default value is 0.
*/
LPFC_ATTR_RW(use_adisc, 0, 0, 1,
	     "Use ADISC on rediscovery to authenticate FCP devices");

/*
# lpfc_ack0: Use ACK0, instead of ACK1 for class 2 acknowledgement. Value
# range is [0,1]. Default value is 0.
*/
LPFC_ATTR_R(ack0, 0, 0, 1, "Enable ACK0 support");

/*
# lpfc_cr_delay & lpfc_cr_count: Default values for I/O colaesing
# cr_delay (msec) or cr_count outstanding commands. cr_delay can take
# value [0,63]. cr_count can take value [0,255]. Default value of cr_delay
# is 0. Default value of cr_count is 1. The cr_count feature is disabled if
# cr_delay is set to 0.
*/
LPFC_ATTR(cr_delay, 0, 0, 63, "A count of milliseconds after which an"
		"interrupt response is generated");

LPFC_ATTR(cr_count, 1, 1, 255, "A count of I/O completions after which an"
		"interrupt response is generated");

/*
# lpfc_fdmi_on: controls FDMI support.
#       0 = no FDMI support
#       1 = support FDMI without attribute of hostname
#       2 = support FDMI with attribute of hostname
# Value range [0,2]. Default value is 0.
*/
LPFC_ATTR_RW(fdmi_on, 0, 0, 2, "Enable FDMI support");

/*
# Specifies the maximum number of ELS cmds we can have outstanding (for
# discovery). Value range is [1,64]. Default value = 32.
*/
LPFC_ATTR(discovery_threads, 32, 1, 64, "Maximum number of ELS commands"
		 "during discovery");

/*
# lpfc_max_luns: maximum number of LUNs per target driver will support
# Value range is [1,32768]. Default value is 256.
# NOTE: The SCSI layer will scan each target for this many luns
*/
LPFC_ATTR_R(max_luns, 256, 1, 32768,
	     "Maximum number of LUNs per target driver will support");

struct class_device_attribute *lpfc_host_attrs[] = {
	&class_device_attr_info,
	&class_device_attr_serialnum,
	&class_device_attr_modeldesc,
	&class_device_attr_modelname,
	&class_device_attr_programtype,
	&class_device_attr_portnum,
	&class_device_attr_fwrev,
	&class_device_attr_hdw,
	&class_device_attr_option_rom_version,
	&class_device_attr_state,
	&class_device_attr_num_discovered_ports,
	&class_device_attr_lpfc_drvr_version,
	&class_device_attr_lpfc_log_verbose,
	&class_device_attr_lpfc_lun_queue_depth,
	&class_device_attr_lpfc_nodev_tmo,
	&class_device_attr_lpfc_fcp_class,
	&class_device_attr_lpfc_use_adisc,
	&class_device_attr_lpfc_ack0,
	&class_device_attr_lpfc_topology,
	&class_device_attr_lpfc_scan_down,
	&class_device_attr_lpfc_link_speed,
	&class_device_attr_lpfc_fdmi_on,
	&class_device_attr_lpfc_max_luns,
	&class_device_attr_nport_evt_cnt,
	&class_device_attr_management_version,
	&class_device_attr_board_online,
	NULL,
};

static ssize_t
sysfs_ctlreg_write(struct kobject *kobj, char *buf, loff_t off, size_t count)
{
	size_t buf_off;
	struct Scsi_Host *host = class_to_shost(container_of(kobj,
					     struct class_device, kobj));
	struct lpfc_hba *phba = (struct lpfc_hba*)host->hostdata[0];

	if ((off + count) > FF_REG_AREA_SIZE)
		return -ERANGE;

	if (count == 0) return 0;

	if (off % 4 || count % 4 || (unsigned long)buf % 4)
		return -EINVAL;

	spin_lock_irq(phba->host->host_lock);

	if (!(phba->fc_flag & FC_OFFLINE_MODE)) {
		spin_unlock_irq(phba->host->host_lock);
		return -EPERM;
	}

	for (buf_off = 0; buf_off < count; buf_off += sizeof(uint32_t))
		writel(*((uint32_t *)(buf + buf_off)),
		       phba->ctrl_regs_memmap_p + off + buf_off);

	spin_unlock_irq(phba->host->host_lock);

	return count;
}

static ssize_t
sysfs_ctlreg_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
{
	size_t buf_off;
	uint32_t * tmp_ptr;
	struct Scsi_Host *host = class_to_shost(container_of(kobj,
					     struct class_device, kobj));
	struct lpfc_hba *phba = (struct lpfc_hba*)host->hostdata[0];

	if (off > FF_REG_AREA_SIZE)
		return -ERANGE;

	if ((off + count) > FF_REG_AREA_SIZE)
		count = FF_REG_AREA_SIZE - off;

	if (count == 0) return 0;

	if (off % 4 || count % 4 || (unsigned long)buf % 4)
		return -EINVAL;

	spin_lock_irq(phba->host->host_lock);

	for (buf_off = 0; buf_off < count; buf_off += sizeof(uint32_t)) {
		tmp_ptr = (uint32_t *)(buf + buf_off);
		*tmp_ptr = readl(phba->ctrl_regs_memmap_p + off + buf_off);
	}

	spin_unlock_irq(phba->host->host_lock);

	return count;
}

static struct bin_attribute sysfs_ctlreg_attr = {
	.attr = {
		.name = "ctlreg",
		.mode = S_IRUSR | S_IWUSR,
		.owner = THIS_MODULE,
	},
	.size = 256,
	.read = sysfs_ctlreg_read,
	.write = sysfs_ctlreg_write,
};


static void
sysfs_mbox_idle (struct lpfc_hba * phba)
{
	phba->sysfs_mbox.state = SMBOX_IDLE;
	phba->sysfs_mbox.offset = 0;

	if (phba->sysfs_mbox.mbox) {
		mempool_free(phba->sysfs_mbox.mbox,
			     phba->mbox_mem_pool);
		phba->sysfs_mbox.mbox = NULL;
	}
}

static ssize_t
sysfs_mbox_write(struct kobject *kobj, char *buf, loff_t off, size_t count)
{
	struct Scsi_Host * host =
		class_to_shost(container_of(kobj, struct class_device, kobj));
	struct lpfc_hba * phba = (struct lpfc_hba*)host->hostdata[0];
	struct lpfcMboxq * mbox = NULL;

	if ((count + off) > MAILBOX_CMD_SIZE)
		return -ERANGE;

	if (off % 4 ||  count % 4 || (unsigned long)buf % 4)
		return -EINVAL;

	if (count == 0)
		return 0;

	if (off == 0) {
		mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
		if (!mbox)
			return -ENOMEM;

	}

	spin_lock_irq(host->host_lock);

	if (off == 0) {
		if (phba->sysfs_mbox.mbox)
			mempool_free(mbox, phba->mbox_mem_pool);
		else
			phba->sysfs_mbox.mbox = mbox;
		phba->sysfs_mbox.state = SMBOX_WRITING;
	} else {
		if (phba->sysfs_mbox.state  != SMBOX_WRITING ||
		    phba->sysfs_mbox.offset != off           ||
		    phba->sysfs_mbox.mbox   == NULL ) {
			sysfs_mbox_idle(phba);
			spin_unlock_irq(host->host_lock);
			return -EINVAL;
		}
	}

	memcpy((uint8_t *) & phba->sysfs_mbox.mbox->mb + off,
	       buf, count);

	phba->sysfs_mbox.offset = off + count;

	spin_unlock_irq(host->host_lock);

	return count;
}

static ssize_t
sysfs_mbox_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
{
	struct Scsi_Host *host =
		class_to_shost(container_of(kobj, struct class_device,
					    kobj));
	struct lpfc_hba *phba = (struct lpfc_hba*)host->hostdata[0];
	int rc;

	if (off > sizeof(MAILBOX_t))
		return -ERANGE;

	if ((count + off) > sizeof(MAILBOX_t))
		count = sizeof(MAILBOX_t) - off;

	if (off % 4 ||  count % 4 || (unsigned long)buf % 4)
		return -EINVAL;

	if (off && count == 0)
		return 0;

	spin_lock_irq(phba->host->host_lock);

	if (off == 0 &&
	    phba->sysfs_mbox.state  == SMBOX_WRITING &&
	    phba->sysfs_mbox.offset >= 2 * sizeof(uint32_t)) {

		switch (phba->sysfs_mbox.mbox->mb.mbxCommand) {
			/* Offline only */
		case MBX_WRITE_NV:
		case MBX_INIT_LINK:
		case MBX_DOWN_LINK:
		case MBX_CONFIG_LINK:
		case MBX_CONFIG_RING:
		case MBX_RESET_RING:
		case MBX_UNREG_LOGIN:
		case MBX_CLEAR_LA:
		case MBX_DUMP_CONTEXT:
		case MBX_RUN_DIAGS:
		case MBX_RESTART:
		case MBX_FLASH_WR_ULA:
		case MBX_SET_MASK:
		case MBX_SET_SLIM:
		case MBX_SET_DEBUG:
			if (!(phba->fc_flag & FC_OFFLINE_MODE)) {
				printk(KERN_WARNING "mbox_read:Command 0x%x "
				       "is illegal in on-line state\n",
				       phba->sysfs_mbox.mbox->mb.mbxCommand);
				sysfs_mbox_idle(phba);
				spin_unlock_irq(phba->host->host_lock);
				return -EPERM;
			}
		case MBX_LOAD_SM:
		case MBX_READ_NV:
		case MBX_READ_CONFIG:
		case MBX_READ_RCONFIG:
		case MBX_READ_STATUS:
		case MBX_READ_XRI:
		case MBX_READ_REV:
		case MBX_READ_LNK_STAT:
		case MBX_DUMP_MEMORY:
		case MBX_DOWN_LOAD:
		case MBX_UPDATE_CFG:
		case MBX_LOAD_AREA:
		case MBX_LOAD_EXP_ROM:
			break;
		case MBX_READ_SPARM64:
		case MBX_READ_LA:
		case MBX_READ_LA64:
		case MBX_REG_LOGIN:
		case MBX_REG_LOGIN64:
		case MBX_CONFIG_PORT:
		case MBX_RUN_BIU_DIAG:
			printk(KERN_WARNING "mbox_read: Illegal Command 0x%x\n",
			       phba->sysfs_mbox.mbox->mb.mbxCommand);
			sysfs_mbox_idle(phba);
			spin_unlock_irq(phba->host->host_lock);
			return -EPERM;
		default:
			printk(KERN_WARNING "mbox_read: Unknown Command 0x%x\n",
			       phba->sysfs_mbox.mbox->mb.mbxCommand);
			sysfs_mbox_idle(phba);
			spin_unlock_irq(phba->host->host_lock);
			return -EPERM;
		}

		if ((phba->fc_flag & FC_OFFLINE_MODE) ||
		    (!(phba->sli.sli_flag & LPFC_SLI2_ACTIVE))){

			spin_unlock_irq(phba->host->host_lock);
			rc = lpfc_sli_issue_mbox (phba,
						  phba->sysfs_mbox.mbox,
						  MBX_POLL);
			spin_lock_irq(phba->host->host_lock);

		} else {
			spin_unlock_irq(phba->host->host_lock);
			rc = lpfc_sli_issue_mbox_wait (phba,
						       phba->sysfs_mbox.mbox,
						       phba->fc_ratov * 2);
			spin_lock_irq(phba->host->host_lock);
		}

		if (rc != MBX_SUCCESS) {
			sysfs_mbox_idle(phba);
			spin_unlock_irq(host->host_lock);
			return -ENODEV;
		}
		phba->sysfs_mbox.state = SMBOX_READING;
	}
	else if (phba->sysfs_mbox.offset != off ||
		 phba->sysfs_mbox.state  != SMBOX_READING) {
		printk(KERN_WARNING  "mbox_read: Bad State\n");
		sysfs_mbox_idle(phba);
		spin_unlock_irq(host->host_lock);
		return -EINVAL;
	}

	memcpy(buf, (uint8_t *) & phba->sysfs_mbox.mbox->mb + off, count);

	phba->sysfs_mbox.offset = off + count;

	if (phba->sysfs_mbox.offset == sizeof(MAILBOX_t))
		sysfs_mbox_idle(phba);

	spin_unlock_irq(phba->host->host_lock);

	return count;
}

static struct bin_attribute sysfs_mbox_attr = {
	.attr = {
		.name = "mbox",
		.mode = S_IRUSR | S_IWUSR,
		.owner = THIS_MODULE,
	},
	.size = sizeof(MAILBOX_t),
	.read = sysfs_mbox_read,
	.write = sysfs_mbox_write,
};

int
lpfc_alloc_sysfs_attr(struct lpfc_hba *phba)
{
	struct Scsi_Host *host = phba->host;
	int error;

	error = sysfs_create_bin_file(&host->shost_classdev.kobj,
							&sysfs_ctlreg_attr);
	if (error)
		goto out;

	error = sysfs_create_bin_file(&host->shost_classdev.kobj,
							&sysfs_mbox_attr);
	if (error)
		goto out_remove_ctlreg_attr;

	return 0;
out_remove_ctlreg_attr:
	sysfs_remove_bin_file(&host->shost_classdev.kobj, &sysfs_ctlreg_attr);