[SCSI] Initial Commit of qla4xxx
open-iSCSI driver for Qlogic Corporation's iSCSI HBAs
Signed-off-by: Ravi Anand <ravi.anand@qlogic.com>
Signed-off-by: David Somayajulu <david.somayajulu@qlogic.com>
Signed-off-by: Doug Maxey <dwm@bubba.enoyolf.org>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/qla4xxx/ql4_iocb.c b/drivers/scsi/qla4xxx/ql4_iocb.c
new file mode 100644
index 0000000..c0a254b
--- /dev/null
+++ b/drivers/scsi/qla4xxx/ql4_iocb.c
@@ -0,0 +1,368 @@
+/*
+ * QLogic iSCSI HBA Driver
+ * Copyright (c) 2003-2006 QLogic Corporation
+ *
+ * See LICENSE.qla4xxx for copyright and licensing details.
+ */
+
+#include "ql4_def.h"
+
+#include <scsi/scsi_tcq.h>
+
+/**
+ * qla4xxx_get_req_pkt - returns a valid entry in request queue.
+ * @ha: Pointer to host adapter structure.
+ * @queue_entry: Pointer to pointer to queue entry structure
+ *
+ * This routine performs the following tasks:
+ * - returns the current request_in pointer (if queue not full)
+ * - advances the request_in pointer
+ * - checks for queue full
+ **/
+int qla4xxx_get_req_pkt(struct scsi_qla_host *ha,
+ struct queue_entry **queue_entry)
+{
+ uint16_t request_in;
+ uint8_t status = QLA_SUCCESS;
+
+ *queue_entry = ha->request_ptr;
+
+ /* get the latest request_in and request_out index */
+ request_in = ha->request_in;
+ ha->request_out = (uint16_t) le32_to_cpu(ha->shadow_regs->req_q_out);
+
+ /* Advance request queue pointer and check for queue full */
+ if (request_in == (REQUEST_QUEUE_DEPTH - 1)) {
+ request_in = 0;
+ ha->request_ptr = ha->request_ring;
+ } else {
+ request_in++;
+ ha->request_ptr++;
+ }
+
+ /* request queue is full, try again later */
+ if ((ha->iocb_cnt + 1) >= ha->iocb_hiwat) {
+ /* restore request pointer */
+ ha->request_ptr = *queue_entry;
+ status = QLA_ERROR;
+ } else {
+ ha->request_in = request_in;
+ memset(*queue_entry, 0, sizeof(**queue_entry));
+ }
+
+ return status;
+}
+
+/**
+ * qla4xxx_send_marker_iocb - issues marker iocb to HBA
+ * @ha: Pointer to host adapter structure.
+ * @ddb_entry: Pointer to device database entry
+ * @lun: SCSI LUN
+ * @marker_type: marker identifier
+ *
+ * This routine issues a marker IOCB.
+ **/
+int qla4xxx_send_marker_iocb(struct scsi_qla_host *ha,
+ struct ddb_entry *ddb_entry, int lun)
+{
+ struct marker_entry *marker_entry;
+ unsigned long flags = 0;
+ uint8_t status = QLA_SUCCESS;
+
+ /* Acquire hardware specific lock */
+ spin_lock_irqsave(&ha->hardware_lock, flags);
+
+ /* Get pointer to the queue entry for the marker */
+ if (qla4xxx_get_req_pkt(ha, (struct queue_entry **) &marker_entry) !=
+ QLA_SUCCESS) {
+ status = QLA_ERROR;
+ goto exit_send_marker;
+ }
+
+ /* Put the marker in the request queue */
+ marker_entry->hdr.entryType = ET_MARKER;
+ marker_entry->hdr.entryCount = 1;
+ marker_entry->target = cpu_to_le16(ddb_entry->fw_ddb_index);
+ marker_entry->modifier = cpu_to_le16(MM_LUN_RESET);
+ int_to_scsilun(lun, &marker_entry->lun);
+ wmb();
+
+ /* Tell ISP it's got a new I/O request */
+ writel(ha->request_in, &ha->reg->req_q_in);
+ readl(&ha->reg->req_q_in);
+
+exit_send_marker:
+ spin_unlock_irqrestore(&ha->hardware_lock, flags);
+ return status;
+}
+
+struct continuation_t1_entry* qla4xxx_alloc_cont_entry(
+ struct scsi_qla_host *ha)
+{
+ struct continuation_t1_entry *cont_entry;
+
+ cont_entry = (struct continuation_t1_entry *)ha->request_ptr;
+
+ /* Advance request queue pointer */
+ if (ha->request_in == (REQUEST_QUEUE_DEPTH - 1)) {
+ ha->request_in = 0;
+ ha->request_ptr = ha->request_ring;
+ } else {
+ ha->request_in++;
+ ha->request_ptr++;
+ }
+
+ /* Load packet defaults */
+ cont_entry->hdr.entryType = ET_CONTINUE;
+ cont_entry->hdr.entryCount = 1;
+ cont_entry->hdr.systemDefined = (uint8_t) cpu_to_le16(ha->request_in);
+
+ return cont_entry;
+}
+
+uint16_t qla4xxx_calc_request_entries(uint16_t dsds)
+{
+ uint16_t iocbs;
+
+ iocbs = 1;
+ if (dsds > COMMAND_SEG) {
+ iocbs += (dsds - COMMAND_SEG) / CONTINUE_SEG;
+ if ((dsds - COMMAND_SEG) % CONTINUE_SEG)
+ iocbs++;
+ }
+ return iocbs;
+}
+
+void qla4xxx_build_scsi_iocbs(struct srb *srb,
+ struct command_t3_entry *cmd_entry,
+ uint16_t tot_dsds)
+{
+ struct scsi_qla_host *ha;
+ uint16_t avail_dsds;
+ struct data_seg_a64 *cur_dsd;
+ struct scsi_cmnd *cmd;
+
+ cmd = srb->cmd;
+ ha = srb->ha;
+
+ if (cmd->request_bufflen == 0 || cmd->sc_data_direction == DMA_NONE) {
+ /* No data being transferred */
+ cmd_entry->ttlByteCnt = __constant_cpu_to_le32(0);
+ return;
+ }
+
+ avail_dsds = COMMAND_SEG;
+ cur_dsd = (struct data_seg_a64 *) & (cmd_entry->dataseg[0]);
+
+ /* Load data segments */
+ if (cmd->use_sg) {
+ struct scatterlist *cur_seg;
+ struct scatterlist *end_seg;
+
+ cur_seg = (struct scatterlist *)cmd->request_buffer;
+ end_seg = cur_seg + tot_dsds;
+ while (cur_seg < end_seg) {
+ dma_addr_t sle_dma;
+
+ /* Allocate additional continuation packets? */
+ if (avail_dsds == 0) {
+ struct continuation_t1_entry *cont_entry;
+
+ cont_entry = qla4xxx_alloc_cont_entry(ha);
+ cur_dsd =
+ (struct data_seg_a64 *)
+ &cont_entry->dataseg[0];
+ avail_dsds = CONTINUE_SEG;
+ }
+
+ sle_dma = sg_dma_address(cur_seg);
+ cur_dsd->base.addrLow = cpu_to_le32(LSDW(sle_dma));
+ cur_dsd->base.addrHigh = cpu_to_le32(MSDW(sle_dma));
+ cur_dsd->count = cpu_to_le32(sg_dma_len(cur_seg));
+ avail_dsds--;
+
+ cur_dsd++;
+ cur_seg++;
+ }
+ } else {
+ cur_dsd->base.addrLow = cpu_to_le32(LSDW(srb->dma_handle));
+ cur_dsd->base.addrHigh = cpu_to_le32(MSDW(srb->dma_handle));
+ cur_dsd->count = cpu_to_le32(cmd->request_bufflen);
+ }
+}
+
+/**
+ * qla4xxx_send_command_to_isp - issues command to HBA
+ * @ha: pointer to host adapter structure.
+ * @srb: pointer to SCSI Request Block to be sent to ISP
+ *
+ * This routine is called by qla4xxx_queuecommand to build an ISP
+ * command and pass it to the ISP for execution.
+ **/
+int qla4xxx_send_command_to_isp(struct scsi_qla_host *ha, struct srb * srb)
+{
+ struct scsi_cmnd *cmd = srb->cmd;
+ struct ddb_entry *ddb_entry;
+ struct command_t3_entry *cmd_entry;
+ struct scatterlist *sg = NULL;
+
+ uint16_t tot_dsds;
+ uint16_t req_cnt;
+
+ unsigned long flags;
+ uint16_t cnt;
+ uint32_t index;
+ char tag[2];
+
+ /* Get real lun and adapter */
+ ddb_entry = srb->ddb;
+
+ /* Send marker(s) if needed. */
+ if (ha->marker_needed == 1) {
+ if (qla4xxx_send_marker_iocb(ha, ddb_entry,
+ cmd->device->lun) != QLA_SUCCESS)
+ return QLA_ERROR;
+
+ ha->marker_needed = 0;
+ }
+ tot_dsds = 0;
+
+ /* Acquire hardware specific lock */
+ spin_lock_irqsave(&ha->hardware_lock, flags);
+
+ index = (uint32_t)cmd->request->tag;
+
+ /* Calculate the number of request entries needed. */
+ if (cmd->use_sg) {
+ sg = (struct scatterlist *)cmd->request_buffer;
+ tot_dsds = pci_map_sg(ha->pdev, sg, cmd->use_sg,
+ cmd->sc_data_direction);
+ if (tot_dsds == 0)
+ goto queuing_error;
+ } else if (cmd->request_bufflen) {
+ dma_addr_t req_dma;
+
+ req_dma = pci_map_single(ha->pdev, cmd->request_buffer,
+ cmd->request_bufflen,
+ cmd->sc_data_direction);
+ if (dma_mapping_error(req_dma))
+ goto queuing_error;
+
+ srb->dma_handle = req_dma;
+ tot_dsds = 1;
+ }
+ req_cnt = qla4xxx_calc_request_entries(tot_dsds);
+
+ if (ha->req_q_count < (req_cnt + 2)) {
+ cnt = (uint16_t) le32_to_cpu(ha->shadow_regs->req_q_out);
+ if (ha->request_in < cnt)
+ ha->req_q_count = cnt - ha->request_in;
+ else
+ ha->req_q_count = REQUEST_QUEUE_DEPTH -
+ (ha->request_in - cnt);
+ }
+
+ if (ha->req_q_count < (req_cnt + 2))
+ goto queuing_error;
+
+ /* total iocbs active */
+ if ((ha->iocb_cnt + req_cnt) >= REQUEST_QUEUE_DEPTH)
+ goto queuing_error;
+
+ /* Build command packet */
+ cmd_entry = (struct command_t3_entry *) ha->request_ptr;
+ memset(cmd_entry, 0, sizeof(struct command_t3_entry));
+ cmd_entry->hdr.entryType = ET_COMMAND;
+ cmd_entry->handle = cpu_to_le32(index);
+ cmd_entry->target = cpu_to_le16(ddb_entry->fw_ddb_index);
+ cmd_entry->connection_id = cpu_to_le16(ddb_entry->connection_id);
+
+ int_to_scsilun(cmd->device->lun, &cmd_entry->lun);
+ cmd_entry->cmdSeqNum = cpu_to_le32(ddb_entry->CmdSn);
+ cmd_entry->ttlByteCnt = cpu_to_le32(cmd->request_bufflen);
+ memcpy(cmd_entry->cdb, cmd->cmnd, cmd->cmd_len);
+ cmd_entry->dataSegCnt = cpu_to_le16(tot_dsds);
+ cmd_entry->hdr.entryCount = req_cnt;
+
+ /* Set data transfer direction control flags
+ * NOTE: Look at data_direction bits iff there is data to be
+ * transferred, as the data direction bit is sometimed filled
+ * in when there is no data to be transferred */
+ cmd_entry->control_flags = CF_NO_DATA;
+ if (cmd->request_bufflen) {
+ if (cmd->sc_data_direction == DMA_TO_DEVICE)
+ cmd_entry->control_flags = CF_WRITE;
+ else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
+ cmd_entry->control_flags = CF_READ;
+ }
+
+ /* Set tagged queueing control flags */
+ cmd_entry->control_flags |= CF_SIMPLE_TAG;
+ if (scsi_populate_tag_msg(cmd, tag))
+ switch (tag[0]) {
+ case MSG_HEAD_TAG:
+ cmd_entry->control_flags |= CF_HEAD_TAG;
+ break;
+ case MSG_ORDERED_TAG:
+ cmd_entry->control_flags |= CF_ORDERED_TAG;
+ break;
+ }
+
+
+ /* Advance request queue pointer */
+ ha->request_in++;
+ if (ha->request_in == REQUEST_QUEUE_DEPTH) {
+ ha->request_in = 0;
+ ha->request_ptr = ha->request_ring;
+ } else
+ ha->request_ptr++;
+
+
+ qla4xxx_build_scsi_iocbs(srb, cmd_entry, tot_dsds);
+ wmb();
+
+ /*
+ * Check to see if adapter is online before placing request on
+ * request queue. If a reset occurs and a request is in the queue,
+ * the firmware will still attempt to process the request, retrieving
+ * garbage for pointers.
+ */
+ if (!test_bit(AF_ONLINE, &ha->flags)) {
+ DEBUG2(printk("scsi%ld: %s: Adapter OFFLINE! "
+ "Do not issue command.\n",
+ ha->host_no, __func__));
+ goto queuing_error;
+ }
+
+ srb->cmd->host_scribble = (unsigned char *)srb;
+
+ /* update counters */
+ srb->state = SRB_ACTIVE_STATE;
+ srb->flags |= SRB_DMA_VALID;
+
+ /* Track IOCB used */
+ ha->iocb_cnt += req_cnt;
+ srb->iocb_cnt = req_cnt;
+ ha->req_q_count -= req_cnt;
+
+ /* Debug print statements */
+ writel(ha->request_in, &ha->reg->req_q_in);
+ readl(&ha->reg->req_q_in);
+ spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+ return QLA_SUCCESS;
+
+queuing_error:
+
+ if (cmd->use_sg && tot_dsds) {
+ sg = (struct scatterlist *) cmd->request_buffer;
+ pci_unmap_sg(ha->pdev, sg, cmd->use_sg,
+ cmd->sc_data_direction);
+ } else if (tot_dsds)
+ pci_unmap_single(ha->pdev, srb->dma_handle,
+ cmd->request_bufflen, cmd->sc_data_direction);
+ spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+ return QLA_ERROR;
+}
+
