qla_os.c

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/*
 * QLogic Fibre Channel HBA Driver
 * Copyright (c)  2003-2005 QLogic Corporation
 *
 * See LICENSE.qla2xxx for copyright and licensing details.
 */
#include "qla_def.h"

#include <linux/moduleparam.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/kthread.h>

#include <scsi/scsi_tcq.h>
#include <scsi/scsicam.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>

/*
 * Driver version
 */
char qla2x00_version_str[40];

/*
 * SRB allocation cache
 */
static struct kmem_cache *srb_cachep;

/*
 * Ioctl related information.
 */
int num_hosts;
int ql2xlogintimeout = 20;
module_param(ql2xlogintimeout, int, S_IRUGO|S_IRUSR);
MODULE_PARM_DESC(ql2xlogintimeout,
		"Login timeout value in seconds.");

int qlport_down_retry;
module_param(qlport_down_retry, int, S_IRUGO|S_IRUSR);
MODULE_PARM_DESC(qlport_down_retry,
		"Maximum number of command retries to a port that returns "
		"a PORT-DOWN status.");

int ql2xplogiabsentdevice;
module_param(ql2xplogiabsentdevice, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(ql2xplogiabsentdevice,
		"Option to enable PLOGI to devices that are not present after "
		"a Fabric scan.  This is needed for several broken switches. "
		"Default is 0 - no PLOGI. 1 - perfom PLOGI.");

int ql2xloginretrycount = 0;
module_param(ql2xloginretrycount, int, S_IRUGO|S_IRUSR);
MODULE_PARM_DESC(ql2xloginretrycount,
		"Specify an alternate value for the NVRAM login retry count.");

int ql2xallocfwdump = 1;
module_param(ql2xallocfwdump, int, S_IRUGO|S_IRUSR);
MODULE_PARM_DESC(ql2xallocfwdump,
		"Option to enable allocation of memory for a firmware dump "
		"during HBA initialization.  Memory allocation requirements "
		"vary by ISP type.  Default is 1 - allocate memory.");

int ql2xextended_error_logging;
module_param(ql2xextended_error_logging, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(ql2xextended_error_logging,
		"Option to enable extended error logging, "
		"Default is 0 - no logging. 1 - log errors.");

static void qla2x00_free_device(scsi_qla_host_t *);

static void qla2x00_config_dma_addressing(scsi_qla_host_t *ha);

int ql2xfdmienable;
module_param(ql2xfdmienable, int, S_IRUGO|S_IRUSR);
MODULE_PARM_DESC(ql2xfdmienable,
		"Enables FDMI registratons "
		"Default is 0 - no FDMI. 1 - perfom FDMI.");

#define MAX_Q_DEPTH    32
static int ql2xmaxqdepth = MAX_Q_DEPTH;
module_param(ql2xmaxqdepth, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(ql2xmaxqdepth,
		"Maximum queue depth to report for target devices.");

int ql2xqfullrampup = 120;
module_param(ql2xqfullrampup, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(ql2xqfullrampup,
		"Number of seconds to wait to begin to ramp-up the queue "
		"depth for a device after a queue-full condition has been "
		"detected.  Default is 120 seconds.");

/*
 * SCSI host template entry points
 */
static int qla2xxx_slave_configure(struct scsi_device * device);
static int qla2xxx_slave_alloc(struct scsi_device *);
static int qla2xxx_scan_finished(struct Scsi_Host *, unsigned long time);
static void qla2xxx_scan_start(struct Scsi_Host *);
static void qla2xxx_slave_destroy(struct scsi_device *);
static int qla2x00_queuecommand(struct scsi_cmnd *cmd,
		void (*fn)(struct scsi_cmnd *));
static int qla24xx_queuecommand(struct scsi_cmnd *cmd,
		void (*fn)(struct scsi_cmnd *));
static int qla2xxx_eh_abort(struct scsi_cmnd *);
static int qla2xxx_eh_device_reset(struct scsi_cmnd *);
static int qla2xxx_eh_bus_reset(struct scsi_cmnd *);
static int qla2xxx_eh_host_reset(struct scsi_cmnd *);
static int qla2x00_loop_reset(scsi_qla_host_t *ha);
static int qla2x00_device_reset(scsi_qla_host_t *, fc_port_t *);

static int qla2x00_change_queue_depth(struct scsi_device *, int);
static int qla2x00_change_queue_type(struct scsi_device *, int);

struct scsi_host_template qla2x00_driver_template = {
	.module			= THIS_MODULE,
	.name			= QLA2XXX_DRIVER_NAME,
	.queuecommand		= qla2x00_queuecommand,

	.eh_abort_handler	= qla2xxx_eh_abort,
	.eh_device_reset_handler = qla2xxx_eh_device_reset,
	.eh_bus_reset_handler	= qla2xxx_eh_bus_reset,
	.eh_host_reset_handler	= qla2xxx_eh_host_reset,

	.slave_configure	= qla2xxx_slave_configure,

	.slave_alloc		= qla2xxx_slave_alloc,
	.slave_destroy		= qla2xxx_slave_destroy,
	.scan_finished		= qla2xxx_scan_finished,
	.scan_start		= qla2xxx_scan_start,
	.change_queue_depth	= qla2x00_change_queue_depth,
	.change_queue_type	= qla2x00_change_queue_type,
	.this_id		= -1,
	.cmd_per_lun		= 3,
	.use_clustering		= ENABLE_CLUSTERING,
	.use_sg_chaining	= ENABLE_SG_CHAINING,
	.sg_tablesize		= SG_ALL,

	/*
	 * The RISC allows for each command to transfer (2^32-1) bytes of data,
	 * which equates to 0x800000 sectors.
	 */
	.max_sectors		= 0xFFFF,
	.shost_attrs		= qla2x00_host_attrs,
};

struct scsi_host_template qla24xx_driver_template = {
	.module			= THIS_MODULE,
	.name			= QLA2XXX_DRIVER_NAME,
	.queuecommand		= qla24xx_queuecommand,

	.eh_abort_handler	= qla2xxx_eh_abort,
	.eh_device_reset_handler = qla2xxx_eh_device_reset,
	.eh_bus_reset_handler	= qla2xxx_eh_bus_reset,
	.eh_host_reset_handler	= qla2xxx_eh_host_reset,

	.slave_configure	= qla2xxx_slave_configure,

	.slave_alloc		= qla2xxx_slave_alloc,
	.slave_destroy		= qla2xxx_slave_destroy,
	.scan_finished		= qla2xxx_scan_finished,
	.scan_start		= qla2xxx_scan_start,
	.change_queue_depth	= qla2x00_change_queue_depth,
	.change_queue_type	= qla2x00_change_queue_type,
	.this_id		= -1,
	.cmd_per_lun		= 3,
	.use_clustering		= ENABLE_CLUSTERING,
	.use_sg_chaining	= ENABLE_SG_CHAINING,
	.sg_tablesize		= SG_ALL,

	.max_sectors		= 0xFFFF,
	.shost_attrs		= qla2x00_host_attrs,
};

static struct scsi_transport_template *qla2xxx_transport_template = NULL;
struct scsi_transport_template *qla2xxx_transport_vport_template = NULL;

/* TODO Convert to inlines
 *
 * Timer routines
 */

void qla2x00_timer(scsi_qla_host_t *);

__inline__ void qla2x00_start_timer(scsi_qla_host_t *,
    void *, unsigned long);
static __inline__ void qla2x00_restart_timer(scsi_qla_host_t *, unsigned long);
__inline__ void qla2x00_stop_timer(scsi_qla_host_t *);

__inline__ void
qla2x00_start_timer(scsi_qla_host_t *ha, void *func, unsigned long interval)
{
	init_timer(&ha->timer);
	ha->timer.expires = jiffies + interval * HZ;
	ha->timer.data = (unsigned long)ha;
	ha->timer.function = (void (*)(unsigned long))func;
	add_timer(&ha->timer);
	ha->timer_active = 1;
}

static inline void
qla2x00_restart_timer(scsi_qla_host_t *ha, unsigned long interval)
{
	mod_timer(&ha->timer, jiffies + interval * HZ);
}

__inline__ void
qla2x00_stop_timer(scsi_qla_host_t *ha)
{
	del_timer_sync(&ha->timer);
	ha->timer_active = 0;
}

static int qla2x00_do_dpc(void *data);

static void qla2x00_rst_aen(scsi_qla_host_t *);

uint8_t qla2x00_mem_alloc(scsi_qla_host_t *);
void qla2x00_mem_free(scsi_qla_host_t *ha);
static int qla2x00_allocate_sp_pool( scsi_qla_host_t *ha);
static void qla2x00_free_sp_pool(scsi_qla_host_t *ha);
static void qla2x00_sp_free_dma(scsi_qla_host_t *, srb_t *);
void qla2x00_sp_compl(scsi_qla_host_t *ha, srb_t *);

/* -------------------------------------------------------------------------- */

static char *
qla2x00_pci_info_str(struct scsi_qla_host *ha, char *str)
{
	static char *pci_bus_modes[] = {
		"33", "66", "100", "133",
	};
	uint16_t pci_bus;

	strcpy(str, "PCI");
	pci_bus = (ha->pci_attr & (BIT_9 | BIT_10)) >> 9;
	if (pci_bus) {
		strcat(str, "-X (");
		strcat(str, pci_bus_modes[pci_bus]);
	} else {
		pci_bus = (ha->pci_attr & BIT_8) >> 8;
		strcat(str, " (");
		strcat(str, pci_bus_modes[pci_bus]);
	}
	strcat(str, " MHz)");

	return (str);
}

static char *
qla24xx_pci_info_str(struct scsi_qla_host *ha, char *str)
{
	static char *pci_bus_modes[] = { "33", "66", "100", "133", };
	uint32_t pci_bus;
	int pcie_reg;

	pcie_reg = pci_find_capability(ha->pdev, PCI_CAP_ID_EXP);
	if (pcie_reg) {
		char lwstr[6];
		uint16_t pcie_lstat, lspeed, lwidth;

		pcie_reg += 0x12;
		pci_read_config_word(ha->pdev, pcie_reg, &pcie_lstat);
		lspeed = pcie_lstat & (BIT_0 | BIT_1 | BIT_2 | BIT_3);
		lwidth = (pcie_lstat &
		    (BIT_4 | BIT_5 | BIT_6 | BIT_7 | BIT_8 | BIT_9)) >> 4;

		strcpy(str, "PCIe (");
		if (lspeed == 1)
			strcat(str, "2.5Gb/s ");
		else if (lspeed == 2)
			strcat(str, "5.0Gb/s ");
		else
			strcat(str, "<unknown> ");
		snprintf(lwstr, sizeof(lwstr), "x%d)", lwidth);
		strcat(str, lwstr);

		return str;
	}

	strcpy(str, "PCI");
	pci_bus = (ha->pci_attr & CSRX_PCIX_BUS_MODE_MASK) >> 8;
	if (pci_bus == 0 || pci_bus == 8) {
		strcat(str, " (");
		strcat(str, pci_bus_modes[pci_bus >> 3]);
	} else {
		strcat(str, "-X ");
		if (pci_bus & BIT_2)
			strcat(str, "Mode 2");
		else
			strcat(str, "Mode 1");
		strcat(str, " (");
		strcat(str, pci_bus_modes[pci_bus & ~BIT_2]);
	}
	strcat(str, " MHz)");

	return str;
}

static char *
qla2x00_fw_version_str(struct scsi_qla_host *ha, char *str)
{
	char un_str[10];

	sprintf(str, "%d.%02d.%02d ", ha->fw_major_version,
	    ha->fw_minor_version,
	    ha->fw_subminor_version);

	if (ha->fw_attributes & BIT_9) {
		strcat(str, "FLX");
		return (str);
	}

	switch (ha->fw_attributes & 0xFF) {
	case 0x7:
		strcat(str, "EF");
		break;
	case 0x17:
		strcat(str, "TP");
		break;
	case 0x37:
		strcat(str, "IP");
		break;
	case 0x77:
		strcat(str, "VI");
		break;
	default:
		sprintf(un_str, "(%x)", ha->fw_attributes);
		strcat(str, un_str);
		break;
	}
	if (ha->fw_attributes & 0x100)
		strcat(str, "X");

	return (str);
}

static char *
qla24xx_fw_version_str(struct scsi_qla_host *ha, char *str)
{
	sprintf(str, "%d.%02d.%02d ", ha->fw_major_version,
	    ha->fw_minor_version,
	    ha->fw_subminor_version);

	if (ha->fw_attributes & BIT_0)
		strcat(str, "[Class 2] ");
	if (ha->fw_attributes & BIT_1)
		strcat(str, "[IP] ");
	if (ha->fw_attributes & BIT_2)
		strcat(str, "[Multi-ID] ");
	if (ha->fw_attributes & BIT_3)
		strcat(str, "[SB-2] ");
	if (ha->fw_attributes & BIT_4)
		strcat(str, "[T10 CRC] ");
	if (ha->fw_attributes & BIT_5)
		strcat(str, "[VI] ");
	if (ha->fw_attributes & BIT_13)
		strcat(str, "[Experimental]");
	return str;
}

static inline srb_t *
qla2x00_get_new_sp(scsi_qla_host_t *ha, fc_port_t *fcport,
    struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
{
	srb_t *sp;

	sp = mempool_alloc(ha->srb_mempool, GFP_ATOMIC);
	if (!sp)
		return sp;

	sp->ha = ha;
	sp->fcport = fcport;
	sp->cmd = cmd;
	sp->flags = 0;
	CMD_SP(cmd) = (void *)sp;
	cmd->scsi_done = done;

	return sp;
}

static int
qla2x00_queuecommand(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
{
	scsi_qla_host_t *ha = shost_priv(cmd->device->host);
	fc_port_t *fcport = (struct fc_port *) cmd->device->hostdata;
	struct fc_rport *rport = starget_to_rport(scsi_target(cmd->device));
	srb_t *sp;
	int rval;

	if (unlikely(pci_channel_offline(ha->pdev))) {
		cmd->result = DID_REQUEUE << 16;
		goto qc_fail_command;
	}

	rval = fc_remote_port_chkready(rport);
	if (rval) {
		cmd->result = rval;
		goto qc_fail_command;
	}

	/* Close window on fcport/rport state-transitioning. */
	if (!*(fc_port_t **)rport->dd_data) {
		cmd->result = DID_IMM_RETRY << 16;
		goto qc_fail_command;
	}

	if (atomic_read(&fcport->state) != FCS_ONLINE) {
		if (atomic_read(&fcport->state) == FCS_DEVICE_DEAD ||
		    atomic_read(&ha->loop_state) == LOOP_DEAD) {
			cmd->result = DID_NO_CONNECT << 16;
			goto qc_fail_command;
		}
		goto qc_host_busy;
	}

	spin_unlock_irq(ha->host->host_lock);

	sp = qla2x00_get_new_sp(ha, fcport, cmd, done);
	if (!sp)
		goto qc_host_busy_lock;

	rval = qla2x00_start_scsi(sp);
	if (rval != QLA_SUCCESS)
		goto qc_host_busy_free_sp;

	spin_lock_irq(ha->host->host_lock);

	return 0;

qc_host_busy_free_sp:
	qla2x00_sp_free_dma(ha, sp);
	mempool_free(sp, ha->srb_mempool);

qc_host_busy_lock:
	spin_lock_irq(ha->host->host_lock);

qc_host_busy:
	return SCSI_MLQUEUE_HOST_BUSY;

qc_fail_command:
	done(cmd);

	return 0;
}


static int
qla24xx_queuecommand(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
{
	scsi_qla_host_t *ha = shost_priv(cmd->device->host);
	fc_port_t *fcport = (struct fc_port *) cmd->device->hostdata;
	struct fc_rport *rport = starget_to_rport(scsi_target(cmd->device));
	srb_t *sp;
	int rval;
	scsi_qla_host_t *pha = to_qla_parent(ha);

	if (unlikely(pci_channel_offline(ha->pdev))) {
		cmd->result = DID_REQUEUE << 16;
		goto qc24_fail_command;
	}

	rval = fc_remote_port_chkready(rport);
	if (rval) {
		cmd->result = rval;
		goto qc24_fail_command;
	}

	/* Close window on fcport/rport state-transitioning. */
	if (!*(fc_port_t **)rport->dd_data) {
		cmd->result = DID_IMM_RETRY << 16;
		goto qc24_fail_command;
	}

	if (atomic_read(&fcport->state) != FCS_ONLINE) {
		if (atomic_read(&fcport->state) == FCS_DEVICE_DEAD ||
		    atomic_read(&pha->loop_state) == LOOP_DEAD) {
			cmd->result = DID_NO_CONNECT << 16;
			goto qc24_fail_command;
		}
		goto qc24_host_busy;
	}

	spin_unlock_irq(ha->host->host_lock);

	sp = qla2x00_get_new_sp(pha, fcport, cmd, done);
	if (!sp)
		goto qc24_host_busy_lock;

	rval = qla24xx_start_scsi(sp);
	if (rval != QLA_SUCCESS)
		goto qc24_host_busy_free_sp;

	spin_lock_irq(ha->host->host_lock);

	return 0;

qc24_host_busy_free_sp:
	qla2x00_sp_free_dma(pha, sp);
	mempool_free(sp, pha->srb_mempool);

qc24_host_busy_lock:
	spin_lock_irq(ha->host->host_lock);

qc24_host_busy:
	return SCSI_MLQUEUE_HOST_BUSY;