/*
 * QLogic Fibre Channel HBA Driver
 * Copyright (c)  2003-2014 QLogic Corporation
 *
 * See LICENSE.qla2xxx for copyright and licensing details.
 */
#include "qla_def.h"

#include <linux/debugfs.h>
#include <linux/seq_file.h>

static struct dentry *qla2x00_dfs_root;
static atomic_t qla2x00_dfs_root_count;

static int
qla2x00_dfs_tgt_sess_show(struct seq_file *s, void *unused)
{
	scsi_qla_host_t *vha = s->private;
	struct qla_hw_data *ha = vha->hw;
	unsigned long flags;
	struct fc_port *sess = NULL;
	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;

	seq_printf(s, "%s\n", vha->host_str);
	if (tgt) {
		seq_puts(s, "Port ID   Port Name                Handle\n");

		spin_lock_irqsave(&ha->tgt.sess_lock, flags);
		list_for_each_entry(sess, &vha->vp_fcports, list)
			seq_printf(s, "%02x:%02x:%02x  %8phC  %d\n",
			    sess->d_id.b.domain, sess->d_id.b.area,
			    sess->d_id.b.al_pa, sess->port_name,
			    sess->loop_id);
		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
	}

	return 0;
}

static int
qla2x00_dfs_tgt_sess_open(struct inode *inode, struct file *file)
{
	scsi_qla_host_t *vha = inode->i_private;

	return single_open(file, qla2x00_dfs_tgt_sess_show, vha);
}

static const struct file_operations dfs_tgt_sess_ops = {
	.open		= qla2x00_dfs_tgt_sess_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int
qla2x00_dfs_tgt_port_database_show(struct seq_file *s, void *unused)
{
	scsi_qla_host_t *vha = s->private;
	struct qla_hw_data *ha = vha->hw;
	struct gid_list_info *gid_list, *gid;
	dma_addr_t gid_list_dma;
	fc_port_t fc_port;
	int rc, i;
	uint16_t entries, loop_id;
	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;

	seq_printf(s, "%s\n", vha->host_str);
	if (tgt) {
		gid_list = dma_alloc_coherent(&ha->pdev->dev,
		    qla2x00_gid_list_size(ha),
		    &gid_list_dma, GFP_KERNEL);
		if (!gid_list) {
			ql_dbg(ql_dbg_user, vha, 0x7018,
			    "DMA allocation failed for %u\n",
			     qla2x00_gid_list_size(ha));
			return 0;
		}

		rc = qla24xx_gidlist_wait(vha, gid_list, gid_list_dma,
		    &entries);
		if (rc != QLA_SUCCESS)
			goto out_free_id_list;

		gid = gid_list;

		seq_puts(s, "Port Name	Port ID 	Loop ID\n");

		for (i = 0; i < entries; i++) {
			loop_id = le16_to_cpu(gid->loop_id);
			memset(&fc_port, 0, sizeof(fc_port_t));

			fc_port.loop_id = loop_id;

			rc = qla24xx_gpdb_wait(vha, &fc_port, 0);
			seq_printf(s, "%8phC  %02x%02x%02x  %d\n",
				fc_port.port_name, fc_port.d_id.b.domain,
				fc_port.d_id.b.area, fc_port.d_id.b.al_pa,
				fc_port.loop_id);
			gid = (void *)gid + ha->gid_list_info_size;
		}
out_free_id_list:
		dma_free_coherent(&ha->pdev->dev, qla2x00_gid_list_size(ha),
		    gid_list, gid_list_dma);
	}

	return 0;
}

static int
qla2x00_dfs_tgt_port_database_open(struct inode *inode, struct file *file)
{
	scsi_qla_host_t *vha = inode->i_private;

	return single_open(file, qla2x00_dfs_tgt_port_database_show, vha);
}

static const struct file_operations dfs_tgt_port_database_ops = {
	.open		= qla2x00_dfs_tgt_port_database_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int
qla_dfs_fw_resource_cnt_show(struct seq_file *s, void *unused)
{
	struct scsi_qla_host *vha = s->private;
	uint16_t mb[MAX_IOCB_MB_REG];
	int rc;

	rc = qla24xx_res_count_wait(vha, mb, SIZEOF_IOCB_MB_REG);
	if (rc != QLA_SUCCESS) {
		seq_printf(s, "Mailbox Command failed %d, mb %#x", rc, mb[0]);
	} else {
		seq_puts(s, "FW Resource count\n\n");
		seq_printf(s, "Original TGT exchg count[%d]\n", mb[1]);
		seq_printf(s, "current TGT exchg count[%d]\n", mb[2]);
		seq_printf(s, "original Initiator Exchange count[%d]\n", mb[3]);
		seq_printf(s, "Current Initiator Exchange count[%d]\n", mb[6]);
		seq_printf(s, "Original IOCB count[%d]\n", mb[7]);
		seq_printf(s, "Current IOCB count[%d]\n", mb[10]);
		seq_printf(s, "MAX VP count[%d]\n", mb[11]);
		seq_printf(s, "MAX FCF count[%d]\n", mb[12]);
		seq_printf(s, "Current free pageable XCB buffer cnt[%d]\n",
		    mb[20]);
		seq_printf(s, "Original Initiator fast XCB buffer cnt[%d]\n",
		    mb[21]);
		seq_printf(s, "Current free Initiator fast XCB buffer cnt[%d]\n",
		    mb[22]);
		seq_printf(s, "Original Target fast XCB buffer cnt[%d]\n",
		    mb[23]);

	}

	return 0;
}

static int
qla_dfs_fw_resource_cnt_open(struct inode *inode, struct file *file)
{
	struct scsi_qla_host *vha = inode->i_private;

	return single_open(file, qla_dfs_fw_resource_cnt_show, vha);
}

static const struct file_operations dfs_fw_resource_cnt_ops = {
	.open           = qla_dfs_fw_resource_cnt_open,
	.read           = seq_read,
	.llseek         = seq_lseek,
	.release        = single_release,
};

static int
qla_dfs_tgt_counters_show(struct seq_file *s, void *unused)
{
	struct scsi_qla_host *vha = s->private;
	struct qla_qpair *qpair = vha->hw->base_qpair;
	uint64_t qla_core_sbt_cmd, core_qla_que_buf, qla_core_ret_ctio,
		core_qla_snd_status, qla_core_ret_sta_ctio, core_qla_free_cmd,
		num_q_full_sent, num_alloc_iocb_failed, num_term_xchg_sent;
	u16 i;

	qla_core_sbt_cmd = qpair->tgt_counters.qla_core_sbt_cmd;
	core_qla_que_buf = qpair->tgt_counters.core_qla_que_buf;
	qla_core_ret_ctio = qpair->tgt_counters.qla_core_ret_ctio;
	core_qla_snd_status = qpair->tgt_counters.core_qla_snd_status;
	qla_core_ret_sta_ctio = qpair->tgt_counters.qla_core_ret_sta_ctio;
	core_qla_free_cmd = qpair->tgt_counters.core_qla_free_cmd;
	num_q_full_sent = qpair->tgt_counters.num_q_full_sent;
	num_alloc_iocb_failed = qpair->tgt_counters.num_alloc_iocb_failed;
	num_term_xchg_sent = qpair->tgt_counters.num_term_xchg_sent;

	for (i = 0; i < vha->hw->max_qpairs; i++) {
		qpair = vha->hw->queue_pair_map[i];
		if (!qpair)
			continue;
		qla_core_sbt_cmd += qpair->tgt_counters.qla_core_sbt_cmd;
		core_qla_que_buf += qpair->tgt_counters.core_qla_que_buf;
		qla_core_ret_ctio += qpair->tgt_counters.qla_core_ret_ctio;
		core_qla_snd_status += qpair->tgt_counters.core_qla_snd_status;
		qla_core_ret_sta_ctio +=
		    qpair->tgt_counters.qla_core_ret_sta_ctio;
		core_qla_free_cmd += qpair->tgt_counters.core_qla_free_cmd;
		num_q_full_sent += qpair->tgt_counters.num_q_full_sent;
		num_alloc_iocb_failed +=
		    qpair->tgt_counters.num_alloc_iocb_failed;
		num_term_xchg_sent += qpair->tgt_counters.num_term_xchg_sent;
	}

	seq_puts(s, "Target Counters\n");
	seq_printf(s, "qla_core_sbt_cmd = %lld\n",
		qla_core_sbt_cmd);
	seq_printf(s, "qla_core_ret_sta_ctio = %lld\n",
		qla_core_ret_sta_ctio);
	seq_printf(s, "qla_core_ret_ctio = %lld\n",
		qla_core_ret_ctio);
	seq_printf(s, "core_qla_que_buf = %lld\n",
		core_qla_que_buf);
	seq_printf(s, "core_qla_snd_status = %lld\n",
		core_qla_snd_status);
	seq_printf(s, "core_qla_free_cmd = %lld\n",
		core_qla_free_cmd);
	seq_printf(s, "num alloc iocb failed = %lld\n",
		num_alloc_iocb_failed);
	seq_printf(s, "num term exchange sent = %lld\n",
		num_term_xchg_sent);
	seq_printf(s, "num Q full sent = %lld\n",
		num_q_full_sent);

	/* DIF stats */
	seq_printf(s, "DIF Inp Bytes = %lld\n",
		vha->qla_stats.qla_dif_stats.dif_input_bytes);
	seq_printf(s, "DIF Outp Bytes = %lld\n",
		vha->qla_stats.qla_dif_stats.dif_output_bytes);
	seq_printf(s, "DIF Inp Req = %lld\n",
		vha->qla_stats.qla_dif_stats.dif_input_requests);
	seq_printf(s, "DIF Outp Req = %lld\n",
		vha->qla_stats.qla_dif_stats.dif_output_requests);
	seq_printf(s, "DIF Guard err = %d\n",
		vha->qla_stats.qla_dif_stats.dif_guard_err);
	seq_printf(s, "DIF Ref tag err = %d\n",
		vha->qla_stats.qla_dif_stats.dif_ref_tag_err);
	seq_printf(s, "DIF App tag err = %d\n",
		vha->qla_stats.qla_dif_stats.dif_app_tag_err);
	return 0;
}

static int
qla_dfs_tgt_counters_open(struct inode *inode, struct file *file)
{
	struct scsi_qla_host *vha = inode->i_private;

	return single_open(file, qla_dfs_tgt_counters_show, vha);
}

static const struct file_operations dfs_tgt_counters_ops = {
	.open           = qla_dfs_tgt_counters_open,
	.read           = seq_read,
	.llseek         = seq_lseek,
	.release        = single_release,
};

static int
qla2x00_dfs_fce_show(struct seq_file *s, void *unused)
{
	scsi_qla_host_t *vha = s->private;
	uint32_t cnt;
	uint32_t *fce;
	uint64_t fce_start;
	struct qla_hw_data *ha = vha->hw;

	mutex_lock(&ha->fce_mutex);

	seq_puts(s, "FCE Trace Buffer\n");
	seq_printf(s, "In Pointer = %llx\n\n", (unsigned long long)ha->fce_wr);
	seq_printf(s, "Base = %llx\n\n", (unsigned long long) ha->fce_dma);
	seq_puts(s, "FCE Enable Registers\n");
	seq_printf(s, "%08x %08x %08x %08x %08x %08x\n",
	    ha->fce_mb[0], ha->fce_mb[2], ha->fce_mb[3], ha->fce_mb[4],
	    ha->fce_mb[5], ha->fce_mb[6]);

	fce = (uint32_t *) ha->fce;
	fce_start = (unsigned long long) ha->fce_dma;
	for (cnt = 0; cnt < fce_calc_size(ha->fce_bufs) / 4; cnt++) {
		if (cnt % 8 == 0)
			seq_printf(s, "\n%llx: ",
			    (unsigned long long)((cnt * 4) + fce_start));
		else
			seq_putc(s, ' ');
		seq_printf(s, "%08x", *fce++);
	}

	seq_puts(s, "\nEnd\n");

	mutex_unlock(&ha->fce_mutex);

	return 0;
}

static int
qla2x00_dfs_fce_open(struct inode *inode, struct file *file)
{
	scsi_qla_host_t *vha = inode->i_private;
	struct qla_hw_data *ha = vha->hw;
	int rval;

	if (!ha->flags.fce_enabled)
		goto out;

	mutex_lock(&ha->fce_mutex);

	/* Pause tracing to flush FCE buffers. */
	rval = qla2x00_disable_fce_trace(vha, &ha->fce_wr, &ha->fce_rd);
	if (rval)
		ql_dbg(ql_dbg_user, vha, 0x705c,
		    "DebugFS: Unable to disable FCE (%d).\n", rval);

	ha->flags.fce_enabled = 0;

	mutex_unlock(&ha->fce_mutex);
out:
	return single_open(file, qla2x00_dfs_fce_show, vha);
}

static int
qla2x00_dfs_fce_release(struct inode *inode, struct file *file)
{
	scsi_qla_host_t *vha = inode->i_private;
	struct qla_hw_data *ha = vha->hw;
	int rval;

	if (ha->flags.fce_enabled)
		goto out;

	mutex_lock(&ha->fce_mutex);

	/* Re-enable FCE tracing. */
	ha->flags.fce_enabled = 1;
	memset(ha->fce, 0, fce_calc_size(ha->fce_bufs));
	rval = qla2x00_enable_fce_trace(vha, ha->fce_dma, ha->fce_bufs,
	    ha->fce_mb, &ha->fce_bufs);
	if (rval) {
		ql_dbg(ql_dbg_user, vha, 0x700d,
		    "DebugFS: Unable to reinitialize FCE (%d).\n", rval);
		ha->flags.fce_enabled = 0;
	}

	mutex_unlock(&ha->fce_mutex);
out:
	return single_release(inode, file);
}

static const struct file_operations dfs_fce_ops = {
	.open		= qla2x00_dfs_fce_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= qla2x00_dfs_fce_release,
};

static int
qla_dfs_naqp_show(struct seq_file *s, void *unused)
{
	struct scsi_qla_host *vha = s->private;
	struct qla_hw_data *ha = vha->hw;

	seq_printf(s, "%d\n", ha->tgt.num_act_qpairs);
	return 0;
}

static int
qla_dfs_naqp_open(struct inode *inode, struct file *file)
{
	struct scsi_qla_host *vha = inode->i_private;

	return single_open(file, qla_dfs_naqp_show, vha);
}

static ssize_t
qla_dfs_naqp_write(struct file *file, const char __user *buffer,
    size_t count, loff_t *pos)
{
	struct seq_file *s = file->private_data;
	struct scsi_qla_host *vha = s->private;
	struct qla_hw_data *ha = vha->hw;
	char *buf;
	int rc = 0;
	unsigned long num_act_qp;

	if (!(IS_QLA27XX(ha) || IS_QLA83XX(ha) || IS_QLA28XX(ha))) {
		pr_err("host%ld: this adapter does not support Multi Q.",
		    vha->host_no);
		return -EINVAL;
	}

	if (!vha->flags.qpairs_available) {
		pr_err("host%ld: Driver is not setup with Multi Q.",
		    vha->host_no);
		return -EINVAL;
	}
	buf = memdup_user_nul(buffer, count);
	if (IS_ERR(buf)) {
		pr_err("host%ld: fail to copy user buffer.",
		    vha->host_no);
		return PTR_ERR(buf);
	}

	num_act_qp = simple_strtoul(buf, NULL, 0);

	if (num_act_qp >= vha->hw->max_qpairs) {
		pr_err("User set invalid number of qpairs %lu. Max = %d",
		    num_act_qp, vha->hw->max_qpairs);
		rc = -EINVAL;
		goto out_free;
	}

	if (num_act_qp != ha->tgt.num_act_qpairs) {
		ha->tgt.num_act_qpairs = num_act_qp;
		qlt_clr_qp_table(vha);
	}
	rc = count;
out_free:
	kfree(buf);
	return rc;
}

static const struct file_operations dfs_naqp_ops = {
	.open		= qla_dfs_naqp_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= qla_dfs_naqp_write,
};


int
qla2x00_dfs_setup(scsi_qla_host_t *vha)
{
	struct qla_hw_data *ha = vha->hw;

	if (!IS_QLA25XX(ha) && !IS_QLA81XX(ha) && !IS_QLA83XX(ha) &&
	    !IS_QLA27XX(ha) && !IS_QLA28XX(ha))
		goto out;
	if (!ha->fce)
		goto out;

	if (qla2x00_dfs_root)
		goto create_dir;

	atomic_set(&qla2x00_dfs_root_count, 0);
	qla2x00_dfs_root = debugfs_create_dir(QLA2XXX_DRIVER_NAME, NULL);

create_dir:
	if (ha->dfs_dir)
		goto create_nodes;

	mutex_init(&ha->fce_mutex);
	ha->dfs_dir = debugfs_create_dir(vha->host_str, qla2x00_dfs_root);

	atomic_inc(&qla2x00_dfs_root_count);

create_nodes:
	ha->dfs_fw_resource_cnt = debugfs_create_file("fw_resource_count",
	    S_IRUSR, ha->dfs_dir, vha, &dfs_fw_resource_cnt_ops);

	ha->dfs_tgt_counters = debugfs_create_file("tgt_counters", S_IRUSR,
	    ha->dfs_dir, vha, &dfs_tgt_counters_ops);

	ha->tgt.dfs_tgt_port_database = debugfs_create_file("tgt_port_database",
	    S_IRUSR,  ha->dfs_dir, vha, &dfs_tgt_port_database_ops);

	ha->dfs_fce = debugfs_create_file("fce", S_IRUSR, ha->dfs_dir, vha,
	    &dfs_fce_ops);

	ha->tgt.dfs_tgt_sess = debugfs_create_file("tgt_sess",
		S_IRUSR, ha->dfs_dir, vha, &dfs_tgt_sess_ops);

	if (IS_QLA27XX(ha) || IS_QLA83XX(ha) || IS_QLA28XX(ha))
		ha->tgt.dfs_naqp = debugfs_create_file("naqp",
		    0400, ha->dfs_dir, vha, &dfs_naqp_ops);
out:
	return 0;
}

int
qla2x00_dfs_remove(scsi_qla_host_t *vha)
{
	struct qla_hw_data *ha = vha->hw;

	if (ha->tgt.dfs_naqp) {
		debugfs_remove(ha->tgt.dfs_naqp);
		ha->tgt.dfs_naqp = NULL;
	}

	if (ha->tgt.dfs_tgt_sess) {
		debugfs_remove(ha->tgt.dfs_tgt_sess);
		ha->tgt.dfs_tgt_sess = NULL;
	}

	if (ha->tgt.dfs_tgt_port_database) {
		debugfs_remove(ha->tgt.dfs_tgt_port_database);
		ha->tgt.dfs_tgt_port_database = NULL;
	}

	if (ha->dfs_fw_resource_cnt) {
		debugfs_remove(ha->dfs_fw_resource_cnt);
		ha->dfs_fw_resource_cnt = NULL;
	}

	if (ha->dfs_tgt_counters) {
		debugfs_remove(ha->dfs_tgt_counters);
		ha->dfs_tgt_counters = NULL;
	}

	if (ha->dfs_fce) {
		debugfs_remove(ha->dfs_fce);
		ha->dfs_fce = NULL;
	}

	if (ha->dfs_dir) {
		debugfs_remove(ha->dfs_dir);
		ha->dfs_dir = NULL;
		atomic_dec(&qla2x00_dfs_root_count);
	}

	if (atomic_read(&qla2x00_dfs_root_count) == 0 &&
	    qla2x00_dfs_root) {
		debugfs_remove(qla2x00_dfs_root);
		qla2x00_dfs_root = NULL;
	}

	return 0;
}