staging/bcm: add sparse annotations

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / lpfc / lpfc_debugfs.c

/*******************************************************************
 * This file is part of the Emulex Linux Device Driver for         *
 * Fibre Channel Host Bus Adapters.                                *
 * Copyright (C) 2007-2009 Emulex.  All rights reserved.           *
 * EMULEX and SLI are trademarks of Emulex.                        *
 * www.emulex.com                                                  *
 *                                                                 *
 * This program is free software; you can redistribute it and/or   *
 * modify it under the terms of version 2 of the GNU General       *
 * Public License as published by the Free Software Foundation.    *
 * This program is distributed in the hope that it will be useful. *
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
 * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
 * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
 * more details, a copy of which can be found in the file COPYING  *
 * included with this package.                                     *
 *******************************************************************/

#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/idr.h>
#include <linux/interrupt.h>
#include <linux/kthread.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/ctype.h>

#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport_fc.h>

#include "lpfc_hw4.h"
#include "lpfc_hw.h"
#include "lpfc_sli.h"
#include "lpfc_sli4.h"
#include "lpfc_nl.h"
#include "lpfc_disc.h"
#include "lpfc_scsi.h"
#include "lpfc.h"
#include "lpfc_logmsg.h"
#include "lpfc_crtn.h"
#include "lpfc_vport.h"
#include "lpfc_version.h"
#include "lpfc_compat.h"
#include "lpfc_debugfs.h"

#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
/*
 * debugfs interface
 *
 * To access this interface the user should:
 * # mount -t debugfs none /sys/kernel/debug
 *
 * The lpfc debugfs directory hierarchy is:
 * lpfc/lpfcX/vportY
 * where X is the lpfc hba unique_id
 * where Y is the vport VPI on that hba
 *
 * Debugging services available per vport:
 * discovery_trace
 * This is an ACSII readable file that contains a trace of the last
 * lpfc_debugfs_max_disc_trc events that happened on a specific vport.
 * See lpfc_debugfs.h for different categories of  discovery events.
 * To enable the discovery trace, the following module parameters must be set:
 * lpfc_debugfs_enable=1         Turns on lpfc debugfs filesystem support
 * lpfc_debugfs_max_disc_trc=X   Where X is the event trace depth for
 *                               EACH vport. X MUST also be a power of 2.
 * lpfc_debugfs_mask_disc_trc=Y  Where Y is an event mask as defined in
 *                               lpfc_debugfs.h .
 *
 * slow_ring_trace
 * This is an ACSII readable file that contains a trace of the last
 * lpfc_debugfs_max_slow_ring_trc events that happened on a specific HBA.
 * To enable the slow ring trace, the following module parameters must be set:
 * lpfc_debugfs_enable=1         Turns on lpfc debugfs filesystem support
 * lpfc_debugfs_max_slow_ring_trc=X   Where X is the event trace depth for
 *                               the HBA. X MUST also be a power of 2.
 */
static int lpfc_debugfs_enable = 1;
module_param(lpfc_debugfs_enable, int, 0);
MODULE_PARM_DESC(lpfc_debugfs_enable, "Enable debugfs services");

/* This MUST be a power of 2 */
static int lpfc_debugfs_max_disc_trc;
module_param(lpfc_debugfs_max_disc_trc, int, 0);
MODULE_PARM_DESC(lpfc_debugfs_max_disc_trc,
        "Set debugfs discovery trace depth");

/* This MUST be a power of 2 */
static int lpfc_debugfs_max_slow_ring_trc;
module_param(lpfc_debugfs_max_slow_ring_trc, int, 0);
MODULE_PARM_DESC(lpfc_debugfs_max_slow_ring_trc,
        "Set debugfs slow ring trace depth");

static int lpfc_debugfs_mask_disc_trc;
module_param(lpfc_debugfs_mask_disc_trc, int, 0);
MODULE_PARM_DESC(lpfc_debugfs_mask_disc_trc,
        "Set debugfs discovery trace mask");

#include <linux/debugfs.h>

/* size of output line, for discovery_trace and slow_ring_trace */
#define LPFC_DEBUG_TRC_ENTRY_SIZE 100

/* nodelist output buffer size */
#define LPFC_NODELIST_SIZE 8192
#define LPFC_NODELIST_ENTRY_SIZE 120

/* dumpHBASlim output buffer size */
#define LPFC_DUMPHBASLIM_SIZE 4096

/* dumpHostSlim output buffer size */
#define LPFC_DUMPHOSTSLIM_SIZE 4096

/* hbqinfo output buffer size */
#define LPFC_HBQINFO_SIZE 8192

struct lpfc_debug {
        char *buffer;
        int  len;
};

static atomic_t lpfc_debugfs_seq_trc_cnt = ATOMIC_INIT(0);
static unsigned long lpfc_debugfs_start_time = 0L;

/**
 * lpfc_debugfs_disc_trc_data - Dump discovery logging to a buffer
 * @vport: The vport to gather the log info from.
 * @buf: The buffer to dump log into.
 * @size: The maximum amount of data to process.
 *
 * Description:
 * This routine gathers the lpfc discovery debugfs data from the @vport and
 * dumps it to @buf up to @size number of bytes. It will start at the next entry
 * in the log and process the log until the end of the buffer. Then it will
 * gather from the beginning of the log and process until the current entry.
 *
 * Notes:
 * Discovery logging will be disabled while while this routine dumps the log.
 *
 * Return Value:
 * This routine returns the amount of bytes that were dumped into @buf and will
 * not exceed @size.
 **/
static int
lpfc_debugfs_disc_trc_data(struct lpfc_vport *vport, char *buf, int size)
{
        int i, index, len, enable;
        uint32_t ms;
        struct lpfc_debugfs_trc *dtp;
        char buffer[LPFC_DEBUG_TRC_ENTRY_SIZE];

        enable = lpfc_debugfs_enable;
        lpfc_debugfs_enable = 0;

        len = 0;
        index = (atomic_read(&vport->disc_trc_cnt) + 1) &
                (lpfc_debugfs_max_disc_trc - 1);
        for (i = index; i < lpfc_debugfs_max_disc_trc; i++) {
                dtp = vport->disc_trc + i;
                if (!dtp->fmt)
                        continue;
                ms = jiffies_to_msecs(dtp->jif - lpfc_debugfs_start_time);
                snprintf(buffer,
                        LPFC_DEBUG_TRC_ENTRY_SIZE, "%010d:%010d ms:%s\n",
                        dtp->seq_cnt, ms, dtp->fmt);
                len +=  snprintf(buf+len, size-len, buffer,
                        dtp->data1, dtp->data2, dtp->data3);
        }
        for (i = 0; i < index; i++) {
                dtp = vport->disc_trc + i;
                if (!dtp->fmt)
                        continue;
                ms = jiffies_to_msecs(dtp->jif - lpfc_debugfs_start_time);
                snprintf(buffer,
                        LPFC_DEBUG_TRC_ENTRY_SIZE, "%010d:%010d ms:%s\n",
                        dtp->seq_cnt, ms, dtp->fmt);
                len +=  snprintf(buf+len, size-len, buffer,
                        dtp->data1, dtp->data2, dtp->data3);
        }

        lpfc_debugfs_enable = enable;
        return len;
}

/**
 * lpfc_debugfs_slow_ring_trc_data - Dump slow ring logging to a buffer
 * @phba: The HBA to gather the log info from.
 * @buf: The buffer to dump log into.
 * @size: The maximum amount of data to process.
 *
 * Description:
 * This routine gathers the lpfc slow ring debugfs data from the @phba and
 * dumps it to @buf up to @size number of bytes. It will start at the next entry
 * in the log and process the log until the end of the buffer. Then it will
 * gather from the beginning of the log and process until the current entry.
 *
 * Notes:
 * Slow ring logging will be disabled while while this routine dumps the log.
 *
 * Return Value:
 * This routine returns the amount of bytes that were dumped into @buf and will
 * not exceed @size.
 **/
static int
lpfc_debugfs_slow_ring_trc_data(struct lpfc_hba *phba, char *buf, int size)
{
        int i, index, len, enable;
        uint32_t ms;
        struct lpfc_debugfs_trc *dtp;
        char buffer[LPFC_DEBUG_TRC_ENTRY_SIZE];


        enable = lpfc_debugfs_enable;
        lpfc_debugfs_enable = 0;

        len = 0;
        index = (atomic_read(&phba->slow_ring_trc_cnt) + 1) &
                (lpfc_debugfs_max_slow_ring_trc - 1);
        for (i = index; i < lpfc_debugfs_max_slow_ring_trc; i++) {
                dtp = phba->slow_ring_trc + i;
                if (!dtp->fmt)
                        continue;
                ms = jiffies_to_msecs(dtp->jif - lpfc_debugfs_start_time);
                snprintf(buffer,
                        LPFC_DEBUG_TRC_ENTRY_SIZE, "%010d:%010d ms:%s\n",
                        dtp->seq_cnt, ms, dtp->fmt);
                len +=  snprintf(buf+len, size-len, buffer,
                        dtp->data1, dtp->data2, dtp->data3);
        }
        for (i = 0; i < index; i++) {
                dtp = phba->slow_ring_trc + i;
                if (!dtp->fmt)
                        continue;
                ms = jiffies_to_msecs(dtp->jif - lpfc_debugfs_start_time);
                snprintf(buffer,
                        LPFC_DEBUG_TRC_ENTRY_SIZE, "%010d:%010d ms:%s\n",
                        dtp->seq_cnt, ms, dtp->fmt);
                len +=  snprintf(buf+len, size-len, buffer,
                        dtp->data1, dtp->data2, dtp->data3);
        }

        lpfc_debugfs_enable = enable;
        return len;
}

static int lpfc_debugfs_last_hbq = -1;

/**
 * lpfc_debugfs_hbqinfo_data - Dump host buffer queue info to a buffer
 * @phba: The HBA to gather host buffer info from.
 * @buf: The buffer to dump log into.
 * @size: The maximum amount of data to process.
 *
 * Description:
 * This routine dumps the host buffer queue info from the @phba to @buf up to
 * @size number of bytes. A header that describes the current hbq state will be
 * dumped to @buf first and then info on each hbq entry will be dumped to @buf
 * until @size bytes have been dumped or all the hbq info has been dumped.
 *
 * Notes:
 * This routine will rotate through each configured HBQ each time called.
 *
 * Return Value:
 * This routine returns the amount of bytes that were dumped into @buf and will
 * not exceed @size.
 **/
static int
lpfc_debugfs_hbqinfo_data(struct lpfc_hba *phba, char *buf, int size)
{
        int len = 0;
        int cnt, i, j, found, posted, low;
        uint32_t phys, raw_index, getidx;
        struct lpfc_hbq_init *hip;
        struct hbq_s *hbqs;
        struct lpfc_hbq_entry *hbqe;
        struct lpfc_dmabuf *d_buf;
        struct hbq_dmabuf *hbq_buf;

        if (phba->sli_rev != 3)
                return 0;
        cnt = LPFC_HBQINFO_SIZE;
        spin_lock_irq(&phba->hbalock);

        /* toggle between multiple hbqs, if any */
        i = lpfc_sli_hbq_count();
        if (i > 1) {
                 lpfc_debugfs_last_hbq++;
                 if (lpfc_debugfs_last_hbq >= i)
                        lpfc_debugfs_last_hbq = 0;
        }
        else
                lpfc_debugfs_last_hbq = 0;

        i = lpfc_debugfs_last_hbq;

        len +=  snprintf(buf+len, size-len, "HBQ %d Info\n", i);

        hbqs =  &phba->hbqs[i];
        posted = 0;
        list_for_each_entry(d_buf, &hbqs->hbq_buffer_list, list)
                posted++;

        hip =  lpfc_hbq_defs[i];
        len +=  snprintf(buf+len, size-len,
                "idx:%d prof:%d rn:%d bufcnt:%d icnt:%d acnt:%d posted %d\n",
                hip->hbq_index, hip->profile, hip->rn,
                hip->buffer_count, hip->init_count, hip->add_count, posted);

        raw_index = phba->hbq_get[i];
        getidx = le32_to_cpu(raw_index);
        len +=  snprintf(buf+len, size-len,
                "entrys:%d bufcnt:%d Put:%d nPut:%d localGet:%d hbaGet:%d\n",
                hbqs->entry_count, hbqs->buffer_count, hbqs->hbqPutIdx,
                hbqs->next_hbqPutIdx, hbqs->local_hbqGetIdx, getidx);

        hbqe = (struct lpfc_hbq_entry *) phba->hbqs[i].hbq_virt;
        for (j=0; j<hbqs->entry_count; j++) {
                len +=  snprintf(buf+len, size-len,
                        "%03d: %08x %04x %05x ", j,
                        le32_to_cpu(hbqe->bde.addrLow),
                        le32_to_cpu(hbqe->bde.tus.w),
                        le32_to_cpu(hbqe->buffer_tag));
                i = 0;
                found = 0;

                /* First calculate if slot has an associated posted buffer */
                low = hbqs->hbqPutIdx - posted;
                if (low >= 0) {
                        if ((j >= hbqs->hbqPutIdx) || (j < low)) {
                                len +=  snprintf(buf+len, size-len, "Unused\n");
                                goto skipit;
                        }
                }
                else {
                        if ((j >= hbqs->hbqPutIdx) &&
                                (j < (hbqs->entry_count+low))) {
                                len +=  snprintf(buf+len, size-len, "Unused\n");
                                goto skipit;
                        }
                }

                /* Get the Buffer info for the posted buffer */
                list_for_each_entry(d_buf, &hbqs->hbq_buffer_list, list) {
                        hbq_buf = container_of(d_buf, struct hbq_dmabuf, dbuf);
                        phys = ((uint64_t)hbq_buf->dbuf.phys & 0xffffffff);
                        if (phys == le32_to_cpu(hbqe->bde.addrLow)) {
                                len +=  snprintf(buf+len, size-len,
                                        "Buf%d: %p %06x\n", i,
                                        hbq_buf->dbuf.virt, hbq_buf->tag);
                                found = 1;
                                break;
                        }
                        i++;
                }
                if (!found) {
                        len +=  snprintf(buf+len, size-len, "No DMAinfo?\n");
                }
skipit:
                hbqe++;
                if (len > LPFC_HBQINFO_SIZE - 54)
                        break;
        }
        spin_unlock_irq(&phba->hbalock);
        return len;
}

static int lpfc_debugfs_last_hba_slim_off;

/**
 * lpfc_debugfs_dumpHBASlim_data - Dump HBA SLIM info to a buffer
 * @phba: The HBA to gather SLIM info from.
 * @buf: The buffer to dump log into.
 * @size: The maximum amount of data to process.
 *
 * Description:
 * This routine dumps the current contents of HBA SLIM for the HBA associated
 * with @phba to @buf up to @size bytes of data. This is the raw HBA SLIM data.
 *
 * Notes:
 * This routine will only dump up to 1024 bytes of data each time called and
 * should be called multiple times to dump the entire HBA SLIM.
 *
 * Return Value:
 * This routine returns the amount of bytes that were dumped into @buf and will
 * not exceed @size.
 **/
static int
lpfc_debugfs_dumpHBASlim_data(struct lpfc_hba *phba, char *buf, int size)
{
        int len = 0;
        int i, off;
        uint32_t *ptr;
        char buffer[1024];

        off = 0;
        spin_lock_irq(&phba->hbalock);

        len +=  snprintf(buf+len, size-len, "HBA SLIM\n");
        lpfc_memcpy_from_slim(buffer,
                phba->MBslimaddr + lpfc_debugfs_last_hba_slim_off, 1024);

        ptr = (uint32_t *)&buffer[0];
        off = lpfc_debugfs_last_hba_slim_off;

        /* Set it up for the next time */
        lpfc_debugfs_last_hba_slim_off += 1024;
        if (lpfc_debugfs_last_hba_slim_off >= 4096)
                lpfc_debugfs_last_hba_slim_off = 0;

        i = 1024;
        while (i > 0) {
                len +=  snprintf(buf+len, size-len,
                "%08x: %08x %08x %08x %08x %08x %08x %08x %08x\n",
                off, *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4),
                *(ptr+5), *(ptr+6), *(ptr+7));
                ptr += 8;
                i -= (8 * sizeof(uint32_t));
                off += (8 * sizeof(uint32_t));
        }

        spin_unlock_irq(&phba->hbalock);
        return len;
}

/**
 * lpfc_debugfs_dumpHostSlim_data - Dump host SLIM info to a buffer
 * @phba: The HBA to gather Host SLIM info from.
 * @buf: The buffer to dump log into.
 * @size: The maximum amount of data to process.
 *
 * Description:
 * This routine dumps the current contents of host SLIM for the host associated
 * with @phba to @buf up to @size bytes of data. The dump will contain the
 * Mailbox, PCB, Rings, and Registers that are located in host memory.
 *
 * Return Value:
 * This routine returns the amount of bytes that were dumped into @buf and will
 * not exceed @size.
 **/
static int
lpfc_debugfs_dumpHostSlim_data(struct lpfc_hba *phba, char *buf, int size)
{
        int len = 0;
        int i, off;
        uint32_t word0, word1, word2, word3;
        uint32_t *ptr;
        struct lpfc_pgp *pgpp;
        struct lpfc_sli *psli = &phba->sli;
        struct lpfc_sli_ring *pring;

        off = 0;
        spin_lock_irq(&phba->hbalock);

        len +=  snprintf(buf+len, size-len, "SLIM Mailbox\n");
        ptr = (uint32_t *)phba->slim2p.virt;
        i = sizeof(MAILBOX_t);
        while (i > 0) {
                len +=  snprintf(buf+len, size-len,
                "%08x: %08x %08x %08x %08x %08x %08x %08x %08x\n",
                off, *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4),
                *(ptr+5), *(ptr+6), *(ptr+7));
                ptr += 8;
                i -= (8 * sizeof(uint32_t));
                off += (8 * sizeof(uint32_t));
        }

        len +=  snprintf(buf+len, size-len, "SLIM PCB\n");
        ptr = (uint32_t *)phba->pcb;
        i = sizeof(PCB_t);
        while (i > 0) {
                len +=  snprintf(buf+len, size-len,
                "%08x: %08x %08x %08x %08x %08x %08x %08x %08x\n",
                off, *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4),
                *(ptr+5), *(ptr+6), *(ptr+7));
                ptr += 8;
                i -= (8 * sizeof(uint32_t));
                off += (8 * sizeof(uint32_t));
        }

        for (i = 0; i < 4; i++) {
                pgpp = &phba->port_gp[i];
                pring = &psli->ring[i];
                len +=  snprintf(buf+len, size-len,
                                 "Ring %d: CMD GetInx:%d (Max:%d Next:%d "
                                 "Local:%d flg:x%x)  RSP PutInx:%d Max:%d\n",
                                 i, pgpp->cmdGetInx, pring->numCiocb,
                                 pring->next_cmdidx, pring->local_getidx,
                                 pring->flag, pgpp->rspPutInx, pring->numRiocb);
        }

        if (phba->sli_rev <= LPFC_SLI_REV3) {
                word0 = readl(phba->HAregaddr);
                word1 = readl(phba->CAregaddr);
                word2 = readl(phba->HSregaddr);
                word3 = readl(phba->HCregaddr);
                len +=  snprintf(buf+len, size-len, "HA:%08x CA:%08x HS:%08x "
                                 "HC:%08x\n", word0, word1, word2, word3);
        }
        spin_unlock_irq(&phba->hbalock);
        return len;
}

/**
 * lpfc_debugfs_nodelist_data - Dump target node list to a buffer
 * @vport: The vport to gather target node info from.
 * @buf: The buffer to dump log into.
 * @size: The maximum amount of data to process.
 *
 * Description:
 * This routine dumps the current target node list associated with @vport to
 * @buf up to @size bytes of data. Each node entry in the dump will contain a
 * node state, DID, WWPN, WWNN, RPI, flags, type, and other useful fields.
 *
 * Return Value:
 * This routine returns the amount of bytes that were dumped into @buf and will
 * not exceed @size.
 **/
static int
lpfc_debugfs_nodelist_data(struct lpfc_vport *vport, char *buf, int size)
{
        int len = 0;
        int cnt;
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_nodelist *ndlp;
        unsigned char *statep, *name;

        cnt = (LPFC_NODELIST_SIZE / LPFC_NODELIST_ENTRY_SIZE);

        spin_lock_irq(shost->host_lock);
        list_for_each_entry(ndlp, &vport->fc_nodes, nlp_listp) {
                if (!cnt) {
                        len +=  snprintf(buf+len, size-len,
                                "Missing Nodelist Entries\n");
                        break;
                }
                cnt--;
                switch (ndlp->nlp_state) {
                case NLP_STE_UNUSED_NODE:
                        statep = "UNUSED";
                        break;
                case NLP_STE_PLOGI_ISSUE:
                        statep = "PLOGI ";
                        break;
                case NLP_STE_ADISC_ISSUE:
                        statep = "ADISC ";
                        break;
                case NLP_STE_REG_LOGIN_ISSUE:
                        statep = "REGLOG";
                        break;
                case NLP_STE_PRLI_ISSUE:
                        statep = "PRLI  ";
                        break;
                case NLP_STE_UNMAPPED_NODE:
                        statep = "UNMAP ";
                        break;
                case NLP_STE_MAPPED_NODE:
                        statep = "MAPPED";
                        break;
                case NLP_STE_NPR_NODE:
                        statep = "NPR   ";
                        break;
                default:
                        statep = "UNKNOWN";
                }
                len +=  snprintf(buf+len, size-len, "%s DID:x%06x ",
                        statep, ndlp->nlp_DID);
                name = (unsigned char *)&ndlp->nlp_portname;
                len +=  snprintf(buf+len, size-len,
                        "WWPN %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x ",
                        *name, *(name+1), *(name+2), *(name+3),
                        *(name+4), *(name+5), *(name+6), *(name+7));
                name = (unsigned char *)&ndlp->nlp_nodename;
                len +=  snprintf(buf+len, size-len,
                        "WWNN %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x ",
                        *name, *(name+1), *(name+2), *(name+3),
                        *(name+4), *(name+5), *(name+6), *(name+7));
                len +=  snprintf(buf+len, size-len, "RPI:%03d flag:x%08x ",
                        ndlp->nlp_rpi, ndlp->nlp_flag);
                if (!ndlp->nlp_type)
                        len +=  snprintf(buf+len, size-len, "UNKNOWN_TYPE ");
                if (ndlp->nlp_type & NLP_FC_NODE)
                        len +=  snprintf(buf+len, size-len, "FC_NODE ");
                if (ndlp->nlp_type & NLP_FABRIC)
                        len +=  snprintf(buf+len, size-len, "FABRIC ");
                if (ndlp->nlp_type & NLP_FCP_TARGET)
                        len +=  snprintf(buf+len, size-len, "FCP_TGT sid:%d ",
                                ndlp->nlp_sid);
                if (ndlp->nlp_type & NLP_FCP_INITIATOR)
                        len +=  snprintf(buf+len, size-len, "FCP_INITIATOR ");
                len += snprintf(buf+len, size-len, "usgmap:%x ",
                        ndlp->nlp_usg_map);
                len += snprintf(buf+len, size-len, "refcnt:%x",
                        atomic_read(&ndlp->kref.refcount));
                len +=  snprintf(buf+len, size-len, "\n");
        }
        spin_unlock_irq(shost->host_lock);
        return len;
}
#endif

/**
 * lpfc_debugfs_disc_trc - Store discovery trace log
 * @vport: The vport to associate this trace string with for retrieval.
 * @mask: Log entry classification.
 * @fmt: Format string to be displayed when dumping the log.
 * @data1: 1st data parameter to be applied to @fmt.
 * @data2: 2nd data parameter to be applied to @fmt.
 * @data3: 3rd data parameter to be applied to @fmt.
 *
 * Description:
 * This routine is used by the driver code to add a debugfs log entry to the
 * discovery trace buffer associated with @vport. Only entries with a @mask that
 * match the current debugfs discovery mask will be saved. Entries that do not
 * match will be thrown away. @fmt, @data1, @data2, and @data3 are used like
 * printf when displaying the log.
 **/
inline void
lpfc_debugfs_disc_trc(struct lpfc_vport *vport, int mask, char *fmt,
        uint32_t data1, uint32_t data2, uint32_t data3)
{
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
        struct lpfc_debugfs_trc *dtp;
        int index;

        if (!(lpfc_debugfs_mask_disc_trc & mask))
                return;

        if (!lpfc_debugfs_enable || !lpfc_debugfs_max_disc_trc ||
                !vport || !vport->disc_trc)
                return;

        index = atomic_inc_return(&vport->disc_trc_cnt) &
                (lpfc_debugfs_max_disc_trc - 1);
        dtp = vport->disc_trc + index;
        dtp->fmt = fmt;
        dtp->data1 = data1;
        dtp->data2 = data2;
        dtp->data3 = data3;
        dtp->seq_cnt = atomic_inc_return(&lpfc_debugfs_seq_trc_cnt);
        dtp->jif = jiffies;
#endif
        return;
}

/**
 * lpfc_debugfs_slow_ring_trc - Store slow ring trace log
 * @phba: The phba to associate this trace string with for retrieval.
 * @fmt: Format string to be displayed when dumping the log.
 * @data1: 1st data parameter to be applied to @fmt.
 * @data2: 2nd data parameter to be applied to @fmt.
 * @data3: 3rd data parameter to be applied to @fmt.
 *
 * Description:
 * This routine is used by the driver code to add a debugfs log entry to the
 * discovery trace buffer associated with @vport. @fmt, @data1, @data2, and
 * @data3 are used like printf when displaying the log.
 **/
inline void
lpfc_debugfs_slow_ring_trc(struct lpfc_hba *phba, char *fmt,
        uint32_t data1, uint32_t data2, uint32_t data3)
{
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
        struct lpfc_debugfs_trc *dtp;
        int index;

        if (!lpfc_debugfs_enable || !lpfc_debugfs_max_slow_ring_trc ||
                !phba || !phba->slow_ring_trc)
                return;

        index = atomic_inc_return(&phba->slow_ring_trc_cnt) &
                (lpfc_debugfs_max_slow_ring_trc - 1);
        dtp = phba->slow_ring_trc + index;
        dtp->fmt = fmt;
        dtp->data1 = data1;
        dtp->data2 = data2;
        dtp->data3 = data3;
        dtp->seq_cnt = atomic_inc_return(&lpfc_debugfs_seq_trc_cnt);
        dtp->jif = jiffies;
#endif
        return;
}

#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
/**
 * lpfc_debugfs_disc_trc_open - Open the discovery trace log
 * @inode: The inode pointer that contains a vport pointer.
 * @file: The file pointer to attach the log output.
 *
 * Description:
 * This routine is the entry point for the debugfs open file operation. It gets
 * the vport from the i_private field in @inode, allocates the necessary buffer
 * for the log, fills the buffer from the in-memory log for this vport, and then
 * returns a pointer to that log in the private_data field in @file.
 *
 * Returns:
 * This function returns zero if successful. On error it will return an negative
 * error value.
 **/
static int
lpfc_debugfs_disc_trc_open(struct inode *inode, struct file *file)
{
        struct lpfc_vport *vport = inode->i_private;
        struct lpfc_debug *debug;
        int size;
        int rc = -ENOMEM;

        if (!lpfc_debugfs_max_disc_trc) {
                 rc = -ENOSPC;
                goto out;
        }

        debug = kmalloc(sizeof(*debug), GFP_KERNEL);
        if (!debug)
                goto out;

        /* Round to page boundary */
        size =  (lpfc_debugfs_max_disc_trc * LPFC_DEBUG_TRC_ENTRY_SIZE);
        size = PAGE_ALIGN(size);

        debug->buffer = kmalloc(size, GFP_KERNEL);
        if (!debug->buffer) {
                kfree(debug);
                goto out;
        }

        debug->len = lpfc_debugfs_disc_trc_data(vport, debug->buffer, size);
        file->private_data = debug;

        rc = 0;
out:
        return rc;
}

/**
 * lpfc_debugfs_slow_ring_trc_open - Open the Slow Ring trace log
 * @inode: The inode pointer that contains a vport pointer.
 * @file: The file pointer to attach the log output.
 *
 * Description:
 * This routine is the entry point for the debugfs open file operation. It gets
 * the vport from the i_private field in @inode, allocates the necessary buffer
 * for the log, fills the buffer from the in-memory log for this vport, and then
 * returns a pointer to that log in the private_data field in @file.
 *
 * Returns:
 * This function returns zero if successful. On error it will return an negative
 * error value.
 **/
static int
lpfc_debugfs_slow_ring_trc_open(struct inode *inode, struct file *file)
{
        struct lpfc_hba *phba = inode->i_private;
        struct lpfc_debug *debug;
        int size;
        int rc = -ENOMEM;

        if (!lpfc_debugfs_max_slow_ring_trc) {
                 rc = -ENOSPC;
                goto out;
        }

        debug = kmalloc(sizeof(*debug), GFP_KERNEL);
        if (!debug)
                goto out;

        /* Round to page boundary */
        size =  (lpfc_debugfs_max_slow_ring_trc * LPFC_DEBUG_TRC_ENTRY_SIZE);
        size = PAGE_ALIGN(size);

        debug->buffer = kmalloc(size, GFP_KERNEL);
        if (!debug->buffer) {
                kfree(debug);
                goto out;
        }

        debug->len = lpfc_debugfs_slow_ring_trc_data(phba, debug->buffer, size);
        file->private_data = debug;

        rc = 0;
out:
        return rc;
}

/**
 * lpfc_debugfs_hbqinfo_open - Open the hbqinfo debugfs buffer
 * @inode: The inode pointer that contains a vport pointer.
 * @file: The file pointer to attach the log output.
 *
 * Description:
 * This routine is the entry point for the debugfs open file operation. It gets
 * the vport from the i_private field in @inode, allocates the necessary buffer
 * for the log, fills the buffer from the in-memory log for this vport, and then
 * returns a pointer to that log in the private_data field in @file.
 *
 * Returns:
 * This function returns zero if successful. On error it will return an negative
 * error value.
 **/
static int
lpfc_debugfs_hbqinfo_open(struct inode *inode, struct file *file)
{
        struct lpfc_hba *phba = inode->i_private;
        struct lpfc_debug *debug;
        int rc = -ENOMEM;

        debug = kmalloc(sizeof(*debug), GFP_KERNEL);
        if (!debug)
                goto out;

        /* Round to page boundary */
        debug->buffer = kmalloc(LPFC_HBQINFO_SIZE, GFP_KERNEL);
        if (!debug->buffer) {
                kfree(debug);
                goto out;
        }

        debug->len = lpfc_debugfs_hbqinfo_data(phba, debug->buffer,
                LPFC_HBQINFO_SIZE);
        file->private_data = debug;

        rc = 0;
out:
        return rc;
}

/**
 * lpfc_debugfs_dumpHBASlim_open - Open the Dump HBA SLIM debugfs buffer
 * @inode: The inode pointer that contains a vport pointer.
 * @file: The file pointer to attach the log output.
 *
 * Description:
 * This routine is the entry point for the debugfs open file operation. It gets
 * the vport from the i_private field in @inode, allocates the necessary buffer
 * for the log, fills the buffer from the in-memory log for this vport, and then
 * returns a pointer to that log in the private_data field in @file.
 *
 * Returns:
 * This function returns zero if successful. On error it will return an negative
 * error value.
 **/
static int
lpfc_debugfs_dumpHBASlim_open(struct inode *inode, struct file *file)
{
        struct lpfc_hba *phba = inode->i_private;
        struct lpfc_debug *debug;
        int rc = -ENOMEM;

        debug = kmalloc(sizeof(*debug), GFP_KERNEL);
        if (!debug)
                goto out;

        /* Round to page boundary */
        debug->buffer = kmalloc(LPFC_DUMPHBASLIM_SIZE, GFP_KERNEL);
        if (!debug->buffer) {
                kfree(debug);
                goto out;
        }

        debug->len = lpfc_debugfs_dumpHBASlim_data(phba, debug->buffer,
                LPFC_DUMPHBASLIM_SIZE);
        file->private_data = debug;

        rc = 0;
out:
        return rc;
}

/**
 * lpfc_debugfs_dumpHostSlim_open - Open the Dump Host SLIM debugfs buffer
 * @inode: The inode pointer that contains a vport pointer.
 * @file: The file pointer to attach the log output.
 *
 * Description:
 * This routine is the entry point for the debugfs open file operation. It gets
 * the vport from the i_private field in @inode, allocates the necessary buffer
 * for the log, fills the buffer from the in-memory log for this vport, and then
 * returns a pointer to that log in the private_data field in @file.
 *
 * Returns:
 * This function returns zero if successful. On error it will return an negative
 * error value.
 **/
static int
lpfc_debugfs_dumpHostSlim_open(struct inode *inode, struct file *file)
{
        struct lpfc_hba *phba = inode->i_private;
        struct lpfc_debug *debug;
        int rc = -ENOMEM;

        debug = kmalloc(sizeof(*debug), GFP_KERNEL);
        if (!debug)
                goto out;

        /* Round to page boundary */
        debug->buffer = kmalloc(LPFC_DUMPHOSTSLIM_SIZE, GFP_KERNEL);
        if (!debug->buffer) {
                kfree(debug);
                goto out;
        }

        debug->len = lpfc_debugfs_dumpHostSlim_data(phba, debug->buffer,
                LPFC_DUMPHOSTSLIM_SIZE);
        file->private_data = debug;

        rc = 0;
out:
        return rc;
}

static int
lpfc_debugfs_dumpData_open(struct inode *inode, struct file *file)
{
        struct lpfc_debug *debug;
        int rc = -ENOMEM;

        if (!_dump_buf_data)
                return -EBUSY;

        debug = kmalloc(sizeof(*debug), GFP_KERNEL);
        if (!debug)
                goto out;

        /* Round to page boundry */
        printk(KERN_ERR "9059 BLKGRD:  %s: _dump_buf_data=0x%p\n",
                        __func__, _dump_buf_data);
        debug->buffer = _dump_buf_data;
        if (!debug->buffer) {
                kfree(debug);
                goto out;
        }

        debug->len = (1 << _dump_buf_data_order) << PAGE_SHIFT;
        file->private_data = debug;

        rc = 0;
out:
        return rc;
}

static int
lpfc_debugfs_dumpDif_open(struct inode *inode, struct file *file)
{
        struct lpfc_debug *debug;
        int rc = -ENOMEM;

        if (!_dump_buf_dif)
                return -EBUSY;

        debug = kmalloc(sizeof(*debug), GFP_KERNEL);
        if (!debug)
                goto out;

        /* Round to page boundry */
        printk(KERN_ERR "9060 BLKGRD: %s: _dump_buf_dif=0x%p file=%s\n",
                __func__, _dump_buf_dif, file->f_dentry->d_name.name);
        debug->buffer = _dump_buf_dif;
        if (!debug->buffer) {
                kfree(debug);
                goto out;
        }

        debug->len = (1 << _dump_buf_dif_order) << PAGE_SHIFT;
        file->private_data = debug;

        rc = 0;
out:
        return rc;
}

static ssize_t
lpfc_debugfs_dumpDataDif_write(struct file *file, const char __user *buf,
                  size_t nbytes, loff_t *ppos)
{
        /*
         * The Data/DIF buffers only save one failing IO
         * The write op is used as a reset mechanism after an IO has
         * already been saved to the next one can be saved
         */
        spin_lock(&_dump_buf_lock);

        memset((void *)_dump_buf_data, 0,
                        ((1 << PAGE_SHIFT) << _dump_buf_data_order));
        memset((void *)_dump_buf_dif, 0,
                        ((1 << PAGE_SHIFT) << _dump_buf_dif_order));

        _dump_buf_done = 0;

        spin_unlock(&_dump_buf_lock);

        return nbytes;
}



/**
 * lpfc_debugfs_nodelist_open - Open the nodelist debugfs file
 * @inode: The inode pointer that contains a vport pointer.
 * @file: The file pointer to attach the log output.
 *
 * Description:
 * This routine is the entry point for the debugfs open file operation. It gets
 * the vport from the i_private field in @inode, allocates the necessary buffer
 * for the log, fills the buffer from the in-memory log for this vport, and then
 * returns a pointer to that log in the private_data field in @file.
 *
 * Returns:
 * This function returns zero if successful. On error it will return an negative
 * error value.
 **/
static int
lpfc_debugfs_nodelist_open(struct inode *inode, struct file *file)
{
        struct lpfc_vport *vport = inode->i_private;
        struct lpfc_debug *debug;
        int rc = -ENOMEM;

        debug = kmalloc(sizeof(*debug), GFP_KERNEL);
        if (!debug)
                goto out;

        /* Round to page boundary */
        debug->buffer = kmalloc(LPFC_NODELIST_SIZE, GFP_KERNEL);
        if (!debug->buffer) {
                kfree(debug);
                goto out;
        }

        debug->len = lpfc_debugfs_nodelist_data(vport, debug->buffer,
                LPFC_NODELIST_SIZE);
        file->private_data = debug;

        rc = 0;
out:
        return rc;
}

/**
 * lpfc_debugfs_lseek - Seek through a debugfs file
 * @file: The file pointer to seek through.
 * @off: The offset to seek to or the amount to seek by.
 * @whence: Indicates how to seek.
 *
 * Description:
 * This routine is the entry point for the debugfs lseek file operation. The
 * @whence parameter indicates whether @off is the offset to directly seek to,
 * or if it is a value to seek forward or reverse by. This function figures out
 * what the new offset of the debugfs file will be and assigns that value to the
 * f_pos field of @file.
 *
 * Returns:
 * This function returns the new offset if successful and returns a negative
 * error if unable to process the seek.
 **/
static loff_t
lpfc_debugfs_lseek(struct file *file, loff_t off, int whence)
{
        struct lpfc_debug *debug;
        loff_t pos = -1;

        debug = file->private_data;

        switch (whence) {
        case 0:
                pos = off;
                break;
        case 1:
                pos = file->f_pos + off;
                break;
        case 2:
                pos = debug->len - off;
        }
        return (pos < 0 || pos > debug->len) ? -EINVAL : (file->f_pos = pos);
}

/**
 * lpfc_debugfs_read - Read a debugfs file
 * @file: The file pointer to read from.
 * @buf: The buffer to copy the data to.
 * @nbytes: The number of bytes to read.
 * @ppos: The position in the file to start reading from.
 *
 * Description:
 * This routine reads data from from the buffer indicated in the private_data
 * field of @file. It will start reading at @ppos and copy up to @nbytes of
 * data to @buf.
 *
 * Returns:
 * This function returns the amount of data that was read (this could be less
 * than @nbytes if the end of the file was reached) or a negative error value.
 **/
static ssize_t
lpfc_debugfs_read(struct file *file, char __user *buf,
                  size_t nbytes, loff_t *ppos)
{
        struct lpfc_debug *debug = file->private_data;
        return simple_read_from_buffer(buf, nbytes, ppos, debug->buffer,
                                       debug->len);
}

/**
 * lpfc_debugfs_release - Release the buffer used to store debugfs file data
 * @inode: The inode pointer that contains a vport pointer. (unused)
 * @file: The file pointer that contains the buffer to release.
 *
 * Description:
 * This routine frees the buffer that was allocated when the debugfs file was
 * opened.
 *
 * Returns:
 * This function returns zero.
 **/
static int
lpfc_debugfs_release(struct inode *inode, struct file *file)
{
        struct lpfc_debug *debug = file->private_data;

        kfree(debug->buffer);
        kfree(debug);

        return 0;
}

static int
lpfc_debugfs_dumpDataDif_release(struct inode *inode, struct file *file)
{
        struct lpfc_debug *debug = file->private_data;

        debug->buffer = NULL;
        kfree(debug);

        return 0;
}

#undef lpfc_debugfs_op_disc_trc
static const struct file_operations lpfc_debugfs_op_disc_trc = {
        .owner =        THIS_MODULE,
        .open =         lpfc_debugfs_disc_trc_open,
        .llseek =       lpfc_debugfs_lseek,
        .read =         lpfc_debugfs_read,
        .release =      lpfc_debugfs_release,
};

#undef lpfc_debugfs_op_nodelist
static const struct file_operations lpfc_debugfs_op_nodelist = {
        .owner =        THIS_MODULE,
        .open =         lpfc_debugfs_nodelist_open,
        .llseek =       lpfc_debugfs_lseek,
        .read =         lpfc_debugfs_read,
        .release =      lpfc_debugfs_release,
};

#undef lpfc_debugfs_op_hbqinfo
static const struct file_operations lpfc_debugfs_op_hbqinfo = {
        .owner =        THIS_MODULE,
        .open =         lpfc_debugfs_hbqinfo_open,
        .llseek =       lpfc_debugfs_lseek,
        .read =         lpfc_debugfs_read,
        .release =      lpfc_debugfs_release,
};

#undef lpfc_debugfs_op_dumpHBASlim
static const struct file_operations lpfc_debugfs_op_dumpHBASlim = {
        .owner =        THIS_MODULE,
        .open =         lpfc_debugfs_dumpHBASlim_open,
        .llseek =       lpfc_debugfs_lseek,
        .read =         lpfc_debugfs_read,
        .release =      lpfc_debugfs_release,
};

#undef lpfc_debugfs_op_dumpHostSlim
static const struct file_operations lpfc_debugfs_op_dumpHostSlim = {
        .owner =        THIS_MODULE,
        .open =         lpfc_debugfs_dumpHostSlim_open,
        .llseek =       lpfc_debugfs_lseek,
        .read =         lpfc_debugfs_read,
        .release =      lpfc_debugfs_release,
};

#undef lpfc_debugfs_op_dumpData
static const struct file_operations lpfc_debugfs_op_dumpData = {
        .owner =        THIS_MODULE,
        .open =         lpfc_debugfs_dumpData_open,
        .llseek =       lpfc_debugfs_lseek,
        .read =         lpfc_debugfs_read,
        .write =        lpfc_debugfs_dumpDataDif_write,
        .release =      lpfc_debugfs_dumpDataDif_release,
};

#undef lpfc_debugfs_op_dumpDif
static const struct file_operations lpfc_debugfs_op_dumpDif = {
        .owner =        THIS_MODULE,
        .open =         lpfc_debugfs_dumpDif_open,
        .llseek =       lpfc_debugfs_lseek,
        .read =         lpfc_debugfs_read,
        .write =        lpfc_debugfs_dumpDataDif_write,
        .release =      lpfc_debugfs_dumpDataDif_release,
};

#undef lpfc_debugfs_op_slow_ring_trc
static const struct file_operations lpfc_debugfs_op_slow_ring_trc = {
        .owner =        THIS_MODULE,
        .open =         lpfc_debugfs_slow_ring_trc_open,
        .llseek =       lpfc_debugfs_lseek,
        .read =         lpfc_debugfs_read,
        .release =      lpfc_debugfs_release,
};

static struct dentry *lpfc_debugfs_root = NULL;
static atomic_t lpfc_debugfs_hba_count;
#endif

/**
 * lpfc_debugfs_initialize - Initialize debugfs for a vport
 * @vport: The vport pointer to initialize.
 *
 * Description:
 * When Debugfs is configured this routine sets up the lpfc debugfs file system.
 * If not already created, this routine will create the lpfc directory, and
 * lpfcX directory (for this HBA), and vportX directory for this vport. It will
 * also create each file used to access lpfc specific debugfs information.
 **/
inline void
lpfc_debugfs_initialize(struct lpfc_vport *vport)
{
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
        struct lpfc_hba   *phba = vport->phba;
        char name[64];
        uint32_t num, i;

        if (!lpfc_debugfs_enable)
                return;

        /* Setup lpfc root directory */
        if (!lpfc_debugfs_root) {
                lpfc_debugfs_root = debugfs_create_dir("lpfc", NULL);
                atomic_set(&lpfc_debugfs_hba_count, 0);
                if (!lpfc_debugfs_root) {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
                                         "0408 Cannot create debugfs root\n");
                        goto debug_failed;
                }
        }
        if (!lpfc_debugfs_start_time)
                lpfc_debugfs_start_time = jiffies;

        /* Setup lpfcX directory for specific HBA */
        snprintf(name, sizeof(name), "lpfc%d", phba->brd_no);
        if (!phba->hba_debugfs_root) {
                phba->hba_debugfs_root =
                        debugfs_create_dir(name, lpfc_debugfs_root);
                if (!phba->hba_debugfs_root) {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
                                         "0412 Cannot create debugfs hba\n");
                        goto debug_failed;
                }
                atomic_inc(&lpfc_debugfs_hba_count);
                atomic_set(&phba->debugfs_vport_count, 0);

                /* Setup hbqinfo */
                snprintf(name, sizeof(name), "hbqinfo");
                phba->debug_hbqinfo =
                        debugfs_create_file(name, S_IFREG|S_IRUGO|S_IWUSR,
                                 phba->hba_debugfs_root,
                                 phba, &lpfc_debugfs_op_hbqinfo);
                if (!phba->debug_hbqinfo) {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
                                "0411 Cannot create debugfs hbqinfo\n");
                        goto debug_failed;
                }

                /* Setup dumpHBASlim */
                snprintf(name, sizeof(name), "dumpHBASlim");
                phba->debug_dumpHBASlim =
                        debugfs_create_file(name, S_IFREG|S_IRUGO|S_IWUSR,
                                 phba->hba_debugfs_root,
                                 phba, &lpfc_debugfs_op_dumpHBASlim);
                if (!phba->debug_dumpHBASlim) {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
                                "0413 Cannot create debugfs dumpHBASlim\n");
                        goto debug_failed;
                }

                /* Setup dumpHostSlim */
                snprintf(name, sizeof(name), "dumpHostSlim");
                phba->debug_dumpHostSlim =
                        debugfs_create_file(name, S_IFREG|S_IRUGO|S_IWUSR,
                                 phba->hba_debugfs_root,
                                 phba, &lpfc_debugfs_op_dumpHostSlim);
                if (!phba->debug_dumpHostSlim) {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
                                "0414 Cannot create debugfs dumpHostSlim\n");
                        goto debug_failed;
                }

                /* Setup dumpData */
                snprintf(name, sizeof(name), "dumpData");
                phba->debug_dumpData =
                        debugfs_create_file(name, S_IFREG|S_IRUGO|S_IWUSR,
                                 phba->hba_debugfs_root,
                                 phba, &lpfc_debugfs_op_dumpData);
                if (!phba->debug_dumpData) {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
                                "0800 Cannot create debugfs dumpData\n");
                        goto debug_failed;
                }

                /* Setup dumpDif */
                snprintf(name, sizeof(name), "dumpDif");
                phba->debug_dumpDif =
                        debugfs_create_file(name, S_IFREG|S_IRUGO|S_IWUSR,
                                 phba->hba_debugfs_root,
                                 phba, &lpfc_debugfs_op_dumpDif);
                if (!phba->debug_dumpDif) {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
                                "0801 Cannot create debugfs dumpDif\n");
                        goto debug_failed;
                }



                /* Setup slow ring trace */
                if (lpfc_debugfs_max_slow_ring_trc) {
                        num = lpfc_debugfs_max_slow_ring_trc - 1;
                        if (num & lpfc_debugfs_max_slow_ring_trc) {
                                /* Change to be a power of 2 */
                                num = lpfc_debugfs_max_slow_ring_trc;
                                i = 0;
                                while (num > 1) {
                                        num = num >> 1;
                                        i++;
                                }
                                lpfc_debugfs_max_slow_ring_trc = (1 << i);
                                printk(KERN_ERR
                                       "lpfc_debugfs_max_disc_trc changed to "
                                       "%d\n", lpfc_debugfs_max_disc_trc);
                        }
                }


                snprintf(name, sizeof(name), "slow_ring_trace");
                phba->debug_slow_ring_trc =
                        debugfs_create_file(name, S_IFREG|S_IRUGO|S_IWUSR,
                                 phba->hba_debugfs_root,
                                 phba, &lpfc_debugfs_op_slow_ring_trc);
                if (!phba->debug_slow_ring_trc) {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
                                         "0415 Cannot create debugfs "
                                         "slow_ring_trace\n");
                        goto debug_failed;
                }
                if (!phba->slow_ring_trc) {
                        phba->slow_ring_trc = kmalloc(
                                (sizeof(struct lpfc_debugfs_trc) *
                                lpfc_debugfs_max_slow_ring_trc),
                                GFP_KERNEL);
                        if (!phba->slow_ring_trc) {
                                lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
                                                 "0416 Cannot create debugfs "
                                                 "slow_ring buffer\n");
                                goto debug_failed;
                        }
                        atomic_set(&phba->slow_ring_trc_cnt, 0);
                        memset(phba->slow_ring_trc, 0,
                                (sizeof(struct lpfc_debugfs_trc) *
                                lpfc_debugfs_max_slow_ring_trc));
                }
        }

        snprintf(name, sizeof(name), "vport%d", vport->vpi);
        if (!vport->vport_debugfs_root) {
                vport->vport_debugfs_root =
                        debugfs_create_dir(name, phba->hba_debugfs_root);
                if (!vport->vport_debugfs_root) {
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
                                         "0417 Cant create debugfs\n");
                        goto debug_failed;
                }
                atomic_inc(&phba->debugfs_vport_count);
        }

        if (lpfc_debugfs_max_disc_trc) {
                num = lpfc_debugfs_max_disc_trc - 1;
                if (num & lpfc_debugfs_max_disc_trc) {
                        /* Change to be a power of 2 */
                        num = lpfc_debugfs_max_disc_trc;
                        i = 0;
                        while (num > 1) {
                                num = num >> 1;
                                i++;
                        }
                        lpfc_debugfs_max_disc_trc = (1 << i);
                        printk(KERN_ERR
                               "lpfc_debugfs_max_disc_trc changed to %d\n",
                               lpfc_debugfs_max_disc_trc);
                }
        }

        vport->disc_trc = kzalloc(
                (sizeof(struct lpfc_debugfs_trc) * lpfc_debugfs_max_disc_trc),
                GFP_KERNEL);

        if (!vport->disc_trc) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
                                 "0418 Cannot create debugfs disc trace "
                                 "buffer\n");
                goto debug_failed;
        }
        atomic_set(&vport->disc_trc_cnt, 0);

        snprintf(name, sizeof(name), "discovery_trace");
        vport->debug_disc_trc =
                debugfs_create_file(name, S_IFREG|S_IRUGO|S_IWUSR,
                                 vport->vport_debugfs_root,
                                 vport, &lpfc_debugfs_op_disc_trc);
        if (!vport->debug_disc_trc) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
                                 "0419 Cannot create debugfs "
                                 "discovery_trace\n");
                goto debug_failed;
        }
        snprintf(name, sizeof(name), "nodelist");
        vport->debug_nodelist =
                debugfs_create_file(name, S_IFREG|S_IRUGO|S_IWUSR,
                                 vport->vport_debugfs_root,
                                 vport, &lpfc_debugfs_op_nodelist);
        if (!vport->debug_nodelist) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
                                 "0409 Cant create debugfs nodelist\n");
                goto debug_failed;
        }
debug_failed:
        return;
#endif
}

/**
 * lpfc_debugfs_terminate -  Tear down debugfs infrastructure for this vport
 * @vport: The vport pointer to remove from debugfs.
 *
 * Description:
 * When Debugfs is configured this routine removes debugfs file system elements
 * that are specific to this vport. It also checks to see if there are any
 * users left for the debugfs directories associated with the HBA and driver. If
 * this is the last user of the HBA directory or driver directory then it will
 * remove those from the debugfs infrastructure as well.
 **/
inline void
lpfc_debugfs_terminate(struct lpfc_vport *vport)
{
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
        struct lpfc_hba   *phba = vport->phba;

        if (vport->disc_trc) {
                kfree(vport->disc_trc);
                vport->disc_trc = NULL;
        }
        if (vport->debug_disc_trc) {
                debugfs_remove(vport->debug_disc_trc); /* discovery_trace */
                vport->debug_disc_trc = NULL;
        }
        if (vport->debug_nodelist) {
                debugfs_remove(vport->debug_nodelist); /* nodelist */
                vport->debug_nodelist = NULL;
        }

        if (vport->vport_debugfs_root) {
                debugfs_remove(vport->vport_debugfs_root); /* vportX */
                vport->vport_debugfs_root = NULL;
                atomic_dec(&phba->debugfs_vport_count);
        }
        if (atomic_read(&phba->debugfs_vport_count) == 0) {

                if (phba->debug_hbqinfo) {
                        debugfs_remove(phba->debug_hbqinfo); /* hbqinfo */
                        phba->debug_hbqinfo = NULL;
                }
                if (phba->debug_dumpHBASlim) {
                        debugfs_remove(phba->debug_dumpHBASlim); /* HBASlim */
                        phba->debug_dumpHBASlim = NULL;
                }
                if (phba->debug_dumpHostSlim) {
                        debugfs_remove(phba->debug_dumpHostSlim); /* HostSlim */
                        phba->debug_dumpHostSlim = NULL;
                }
                if (phba->debug_dumpData) {
                        debugfs_remove(phba->debug_dumpData); /* dumpData */
                        phba->debug_dumpData = NULL;
                }

                if (phba->debug_dumpDif) {
                        debugfs_remove(phba->debug_dumpDif); /* dumpDif */
                        phba->debug_dumpDif = NULL;
                }

                if (phba->slow_ring_trc) {
                        kfree(phba->slow_ring_trc);
                        phba->slow_ring_trc = NULL;
                }
                if (phba->debug_slow_ring_trc) {
                        /* slow_ring_trace */
                        debugfs_remove(phba->debug_slow_ring_trc);
                        phba->debug_slow_ring_trc = NULL;
                }

                if (phba->hba_debugfs_root) {
                        debugfs_remove(phba->hba_debugfs_root); /* lpfcX */
                        phba->hba_debugfs_root = NULL;
                        atomic_dec(&lpfc_debugfs_hba_count);
                }

                if (atomic_read(&lpfc_debugfs_hba_count) == 0) {
                        debugfs_remove(lpfc_debugfs_root); /* lpfc */
                        lpfc_debugfs_root = NULL;
                }
        }
#endif
        return;
}