342 lines
8.7 KiB
C
342 lines
8.7 KiB
C
/*
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* QLogic iSCSI HBA Driver
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* Copyright (c) 2003-2006 QLogic Corporation
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*
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* See LICENSE.qla4xxx for copyright and licensing details.
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*/
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#include "ql4_def.h"
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#include "ql4_glbl.h"
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#include "ql4_dbg.h"
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#include "ql4_inline.h"
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#include <scsi/scsi_tcq.h>
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/**
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* qla4xxx_get_req_pkt - returns a valid entry in request queue.
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* @ha: Pointer to host adapter structure.
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* @queue_entry: Pointer to pointer to queue entry structure
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*
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* This routine performs the following tasks:
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* - returns the current request_in pointer (if queue not full)
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* - advances the request_in pointer
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* - checks for queue full
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**/
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static int qla4xxx_get_req_pkt(struct scsi_qla_host *ha,
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struct queue_entry **queue_entry)
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{
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uint16_t request_in;
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uint8_t status = QLA_SUCCESS;
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*queue_entry = ha->request_ptr;
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/* get the latest request_in and request_out index */
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request_in = ha->request_in;
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ha->request_out = (uint16_t) le32_to_cpu(ha->shadow_regs->req_q_out);
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/* Advance request queue pointer and check for queue full */
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if (request_in == (REQUEST_QUEUE_DEPTH - 1)) {
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request_in = 0;
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ha->request_ptr = ha->request_ring;
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} else {
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request_in++;
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ha->request_ptr++;
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}
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/* request queue is full, try again later */
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if ((ha->iocb_cnt + 1) >= ha->iocb_hiwat) {
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/* restore request pointer */
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ha->request_ptr = *queue_entry;
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status = QLA_ERROR;
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} else {
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ha->request_in = request_in;
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memset(*queue_entry, 0, sizeof(**queue_entry));
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}
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return status;
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}
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/**
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* qla4xxx_send_marker_iocb - issues marker iocb to HBA
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* @ha: Pointer to host adapter structure.
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* @ddb_entry: Pointer to device database entry
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* @lun: SCSI LUN
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* @marker_type: marker identifier
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*
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* This routine issues a marker IOCB.
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**/
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int qla4xxx_send_marker_iocb(struct scsi_qla_host *ha,
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struct ddb_entry *ddb_entry, int lun, uint16_t mrkr_mod)
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{
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struct qla4_marker_entry *marker_entry;
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unsigned long flags = 0;
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uint8_t status = QLA_SUCCESS;
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/* Acquire hardware specific lock */
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spin_lock_irqsave(&ha->hardware_lock, flags);
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/* Get pointer to the queue entry for the marker */
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if (qla4xxx_get_req_pkt(ha, (struct queue_entry **) &marker_entry) !=
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QLA_SUCCESS) {
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status = QLA_ERROR;
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goto exit_send_marker;
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}
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/* Put the marker in the request queue */
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marker_entry->hdr.entryType = ET_MARKER;
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marker_entry->hdr.entryCount = 1;
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marker_entry->target = cpu_to_le16(ddb_entry->fw_ddb_index);
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marker_entry->modifier = cpu_to_le16(mrkr_mod);
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int_to_scsilun(lun, &marker_entry->lun);
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wmb();
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/* Tell ISP it's got a new I/O request */
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writel(ha->request_in, &ha->reg->req_q_in);
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readl(&ha->reg->req_q_in);
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exit_send_marker:
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spin_unlock_irqrestore(&ha->hardware_lock, flags);
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return status;
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}
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static struct continuation_t1_entry* qla4xxx_alloc_cont_entry(
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struct scsi_qla_host *ha)
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{
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struct continuation_t1_entry *cont_entry;
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cont_entry = (struct continuation_t1_entry *)ha->request_ptr;
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/* Advance request queue pointer */
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if (ha->request_in == (REQUEST_QUEUE_DEPTH - 1)) {
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ha->request_in = 0;
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ha->request_ptr = ha->request_ring;
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} else {
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ha->request_in++;
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ha->request_ptr++;
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}
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/* Load packet defaults */
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cont_entry->hdr.entryType = ET_CONTINUE;
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cont_entry->hdr.entryCount = 1;
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cont_entry->hdr.systemDefined = (uint8_t) cpu_to_le16(ha->request_in);
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return cont_entry;
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}
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static uint16_t qla4xxx_calc_request_entries(uint16_t dsds)
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{
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uint16_t iocbs;
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iocbs = 1;
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if (dsds > COMMAND_SEG) {
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iocbs += (dsds - COMMAND_SEG) / CONTINUE_SEG;
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if ((dsds - COMMAND_SEG) % CONTINUE_SEG)
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iocbs++;
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}
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return iocbs;
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}
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static void qla4xxx_build_scsi_iocbs(struct srb *srb,
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struct command_t3_entry *cmd_entry,
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uint16_t tot_dsds)
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{
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struct scsi_qla_host *ha;
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uint16_t avail_dsds;
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struct data_seg_a64 *cur_dsd;
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struct scsi_cmnd *cmd;
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struct scatterlist *sg;
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int i;
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cmd = srb->cmd;
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ha = srb->ha;
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if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
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/* No data being transferred */
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cmd_entry->ttlByteCnt = __constant_cpu_to_le32(0);
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return;
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}
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avail_dsds = COMMAND_SEG;
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cur_dsd = (struct data_seg_a64 *) & (cmd_entry->dataseg[0]);
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scsi_for_each_sg(cmd, sg, tot_dsds, i) {
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dma_addr_t sle_dma;
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/* Allocate additional continuation packets? */
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if (avail_dsds == 0) {
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struct continuation_t1_entry *cont_entry;
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cont_entry = qla4xxx_alloc_cont_entry(ha);
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cur_dsd =
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(struct data_seg_a64 *)
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&cont_entry->dataseg[0];
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avail_dsds = CONTINUE_SEG;
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}
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sle_dma = sg_dma_address(sg);
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cur_dsd->base.addrLow = cpu_to_le32(LSDW(sle_dma));
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cur_dsd->base.addrHigh = cpu_to_le32(MSDW(sle_dma));
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cur_dsd->count = cpu_to_le32(sg_dma_len(sg));
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avail_dsds--;
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cur_dsd++;
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}
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}
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/**
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* qla4xxx_send_command_to_isp - issues command to HBA
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* @ha: pointer to host adapter structure.
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* @srb: pointer to SCSI Request Block to be sent to ISP
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*
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* This routine is called by qla4xxx_queuecommand to build an ISP
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* command and pass it to the ISP for execution.
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**/
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int qla4xxx_send_command_to_isp(struct scsi_qla_host *ha, struct srb * srb)
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{
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struct scsi_cmnd *cmd = srb->cmd;
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struct ddb_entry *ddb_entry;
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struct command_t3_entry *cmd_entry;
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int nseg;
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uint16_t tot_dsds;
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uint16_t req_cnt;
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unsigned long flags;
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uint16_t cnt;
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uint32_t index;
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char tag[2];
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/* Get real lun and adapter */
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ddb_entry = srb->ddb;
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tot_dsds = 0;
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/* Acquire hardware specific lock */
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spin_lock_irqsave(&ha->hardware_lock, flags);
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index = (uint32_t)cmd->request->tag;
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/* Calculate the number of request entries needed. */
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nseg = scsi_dma_map(cmd);
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if (nseg < 0)
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goto queuing_error;
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tot_dsds = nseg;
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req_cnt = qla4xxx_calc_request_entries(tot_dsds);
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if (ha->req_q_count < (req_cnt + 2)) {
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cnt = (uint16_t) le32_to_cpu(ha->shadow_regs->req_q_out);
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if (ha->request_in < cnt)
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ha->req_q_count = cnt - ha->request_in;
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else
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ha->req_q_count = REQUEST_QUEUE_DEPTH -
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(ha->request_in - cnt);
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}
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if (ha->req_q_count < (req_cnt + 2))
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goto queuing_error;
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/* total iocbs active */
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if ((ha->iocb_cnt + req_cnt) >= REQUEST_QUEUE_DEPTH)
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goto queuing_error;
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/* Build command packet */
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cmd_entry = (struct command_t3_entry *) ha->request_ptr;
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memset(cmd_entry, 0, sizeof(struct command_t3_entry));
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cmd_entry->hdr.entryType = ET_COMMAND;
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cmd_entry->handle = cpu_to_le32(index);
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cmd_entry->target = cpu_to_le16(ddb_entry->fw_ddb_index);
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cmd_entry->connection_id = cpu_to_le16(ddb_entry->connection_id);
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int_to_scsilun(cmd->device->lun, &cmd_entry->lun);
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cmd_entry->cmdSeqNum = cpu_to_le32(ddb_entry->CmdSn);
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cmd_entry->ttlByteCnt = cpu_to_le32(scsi_bufflen(cmd));
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memcpy(cmd_entry->cdb, cmd->cmnd, cmd->cmd_len);
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cmd_entry->dataSegCnt = cpu_to_le16(tot_dsds);
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cmd_entry->hdr.entryCount = req_cnt;
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/* Set data transfer direction control flags
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* NOTE: Look at data_direction bits iff there is data to be
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* transferred, as the data direction bit is sometimed filled
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* in when there is no data to be transferred */
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cmd_entry->control_flags = CF_NO_DATA;
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if (scsi_bufflen(cmd)) {
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if (cmd->sc_data_direction == DMA_TO_DEVICE)
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cmd_entry->control_flags = CF_WRITE;
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else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
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cmd_entry->control_flags = CF_READ;
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ha->bytes_xfered += scsi_bufflen(cmd);
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if (ha->bytes_xfered & ~0xFFFFF){
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ha->total_mbytes_xferred += ha->bytes_xfered >> 20;
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ha->bytes_xfered &= 0xFFFFF;
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}
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}
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/* Set tagged queueing control flags */
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cmd_entry->control_flags |= CF_SIMPLE_TAG;
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if (scsi_populate_tag_msg(cmd, tag))
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switch (tag[0]) {
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case MSG_HEAD_TAG:
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cmd_entry->control_flags |= CF_HEAD_TAG;
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break;
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case MSG_ORDERED_TAG:
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cmd_entry->control_flags |= CF_ORDERED_TAG;
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break;
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}
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/* Advance request queue pointer */
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ha->request_in++;
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if (ha->request_in == REQUEST_QUEUE_DEPTH) {
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ha->request_in = 0;
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ha->request_ptr = ha->request_ring;
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} else
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ha->request_ptr++;
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qla4xxx_build_scsi_iocbs(srb, cmd_entry, tot_dsds);
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wmb();
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/*
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* Check to see if adapter is online before placing request on
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* request queue. If a reset occurs and a request is in the queue,
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* the firmware will still attempt to process the request, retrieving
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* garbage for pointers.
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*/
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if (!test_bit(AF_ONLINE, &ha->flags)) {
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DEBUG2(printk("scsi%ld: %s: Adapter OFFLINE! "
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"Do not issue command.\n",
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ha->host_no, __func__));
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goto queuing_error;
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}
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srb->cmd->host_scribble = (unsigned char *)srb;
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/* update counters */
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srb->state = SRB_ACTIVE_STATE;
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srb->flags |= SRB_DMA_VALID;
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/* Track IOCB used */
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ha->iocb_cnt += req_cnt;
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srb->iocb_cnt = req_cnt;
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ha->req_q_count -= req_cnt;
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/* Debug print statements */
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writel(ha->request_in, &ha->reg->req_q_in);
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readl(&ha->reg->req_q_in);
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spin_unlock_irqrestore(&ha->hardware_lock, flags);
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return QLA_SUCCESS;
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queuing_error:
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if (tot_dsds)
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scsi_dma_unmap(cmd);
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spin_unlock_irqrestore(&ha->hardware_lock, flags);
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return QLA_ERROR;
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}
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