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path: root/drivers/scsi/qla2xxx/qla_iocb.c
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Diffstat (limited to 'drivers/scsi/qla2xxx/qla_iocb.c')
-rw-r--r--drivers/scsi/qla2xxx/qla_iocb.c633
1 files changed, 633 insertions, 0 deletions
diff --git a/drivers/scsi/qla2xxx/qla_iocb.c b/drivers/scsi/qla2xxx/qla_iocb.c
new file mode 100644
index 000000000000..ec066074c722
--- /dev/null
+++ b/drivers/scsi/qla2xxx/qla_iocb.c
@@ -0,0 +1,633 @@
+/******************************************************************************
+ * QLOGIC LINUX SOFTWARE
+ *
+ * QLogic ISP2x00 device driver for Linux 2.6.x
+ * Copyright (C) 2003-2004 QLogic Corporation
+ * (www.qlogic.com)
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ ******************************************************************************/
+
+#include "qla_def.h"
+
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+
+#include <scsi/scsi_tcq.h>
+
+static inline uint16_t qla2x00_get_cmd_direction(struct scsi_cmnd *cmd);
+static inline cont_entry_t *qla2x00_prep_cont_type0_iocb(scsi_qla_host_t *);
+static inline cont_a64_entry_t *qla2x00_prep_cont_type1_iocb(scsi_qla_host_t *);
+static request_t *qla2x00_req_pkt(scsi_qla_host_t *ha);
+
+/**
+ * qla2x00_get_cmd_direction() - Determine control_flag data direction.
+ * @cmd: SCSI command
+ *
+ * Returns the proper CF_* direction based on CDB.
+ */
+static inline uint16_t
+qla2x00_get_cmd_direction(struct scsi_cmnd *cmd)
+{
+ uint16_t cflags;
+
+ cflags = 0;
+
+ /* Set transfer direction */
+ if (cmd->sc_data_direction == DMA_TO_DEVICE)
+ cflags = CF_WRITE;
+ else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
+ cflags = CF_READ;
+ return (cflags);
+}
+
+/**
+ * qla2x00_calc_iocbs_32() - Determine number of Command Type 2 and
+ * Continuation Type 0 IOCBs to allocate.
+ *
+ * @dsds: number of data segment decriptors needed
+ *
+ * Returns the number of IOCB entries needed to store @dsds.
+ */
+uint16_t
+qla2x00_calc_iocbs_32(uint16_t dsds)
+{
+ uint16_t iocbs;
+
+ iocbs = 1;
+ if (dsds > 3) {
+ iocbs += (dsds - 3) / 7;
+ if ((dsds - 3) % 7)
+ iocbs++;
+ }
+ return (iocbs);
+}
+
+/**
+ * qla2x00_calc_iocbs_64() - Determine number of Command Type 3 and
+ * Continuation Type 1 IOCBs to allocate.
+ *
+ * @dsds: number of data segment decriptors needed
+ *
+ * Returns the number of IOCB entries needed to store @dsds.
+ */
+uint16_t
+qla2x00_calc_iocbs_64(uint16_t dsds)
+{
+ uint16_t iocbs;
+
+ iocbs = 1;
+ if (dsds > 2) {
+ iocbs += (dsds - 2) / 5;
+ if ((dsds - 2) % 5)
+ iocbs++;
+ }
+ return (iocbs);
+}
+
+/**
+ * qla2x00_prep_cont_type0_iocb() - Initialize a Continuation Type 0 IOCB.
+ * @ha: HA context
+ *
+ * Returns a pointer to the Continuation Type 0 IOCB packet.
+ */
+static inline cont_entry_t *
+qla2x00_prep_cont_type0_iocb(scsi_qla_host_t *ha)
+{
+ cont_entry_t *cont_pkt;
+
+ /* Adjust ring index. */
+ ha->req_ring_index++;
+ if (ha->req_ring_index == ha->request_q_length) {
+ ha->req_ring_index = 0;
+ ha->request_ring_ptr = ha->request_ring;
+ } else {
+ ha->request_ring_ptr++;
+ }
+
+ cont_pkt = (cont_entry_t *)ha->request_ring_ptr;
+
+ /* Load packet defaults. */
+ *((uint32_t *)(&cont_pkt->entry_type)) =
+ __constant_cpu_to_le32(CONTINUE_TYPE);
+
+ return (cont_pkt);
+}
+
+/**
+ * qla2x00_prep_cont_type1_iocb() - Initialize a Continuation Type 1 IOCB.
+ * @ha: HA context
+ *
+ * Returns a pointer to the continuation type 1 IOCB packet.
+ */
+static inline cont_a64_entry_t *
+qla2x00_prep_cont_type1_iocb(scsi_qla_host_t *ha)
+{
+ cont_a64_entry_t *cont_pkt;
+
+ /* Adjust ring index. */
+ ha->req_ring_index++;
+ if (ha->req_ring_index == ha->request_q_length) {
+ ha->req_ring_index = 0;
+ ha->request_ring_ptr = ha->request_ring;
+ } else {
+ ha->request_ring_ptr++;
+ }
+
+ cont_pkt = (cont_a64_entry_t *)ha->request_ring_ptr;
+
+ /* Load packet defaults. */
+ *((uint32_t *)(&cont_pkt->entry_type)) =
+ __constant_cpu_to_le32(CONTINUE_A64_TYPE);
+
+ return (cont_pkt);
+}
+
+/**
+ * qla2x00_build_scsi_iocbs_32() - Build IOCB command utilizing 32bit
+ * capable IOCB types.
+ *
+ * @sp: SRB command to process
+ * @cmd_pkt: Command type 2 IOCB
+ * @tot_dsds: Total number of segments to transfer
+ */
+void qla2x00_build_scsi_iocbs_32(srb_t *sp, cmd_entry_t *cmd_pkt,
+ uint16_t tot_dsds)
+{
+ uint16_t avail_dsds;
+ uint32_t *cur_dsd;
+ scsi_qla_host_t *ha;
+ struct scsi_cmnd *cmd;
+
+ cmd = sp->cmd;
+
+ /* Update entry type to indicate Command Type 2 IOCB */
+ *((uint32_t *)(&cmd_pkt->entry_type)) =
+ __constant_cpu_to_le32(COMMAND_TYPE);
+
+ /* No data transfer */
+ if (cmd->request_bufflen == 0 || cmd->sc_data_direction == DMA_NONE) {
+ cmd_pkt->byte_count = __constant_cpu_to_le32(0);
+ return;
+ }
+
+ ha = sp->ha;
+
+ cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(cmd));
+
+ /* Three DSDs are available in the Command Type 2 IOCB */
+ avail_dsds = 3;
+ cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
+
+ /* Load data segments */
+ if (cmd->use_sg != 0) {
+ 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) {
+ cont_entry_t *cont_pkt;
+
+ /* Allocate additional continuation packets? */
+ if (avail_dsds == 0) {
+ /*
+ * Seven DSDs are available in the Continuation
+ * Type 0 IOCB.
+ */
+ cont_pkt = qla2x00_prep_cont_type0_iocb(ha);
+ cur_dsd = (uint32_t *)&cont_pkt->dseg_0_address;
+ avail_dsds = 7;
+ }
+
+ *cur_dsd++ = cpu_to_le32(sg_dma_address(cur_seg));
+ *cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
+ avail_dsds--;
+
+ cur_seg++;
+ }
+ } else {
+ dma_addr_t req_dma;
+ struct page *page;
+ unsigned long offset;
+
+ page = virt_to_page(cmd->request_buffer);
+ offset = ((unsigned long)cmd->request_buffer & ~PAGE_MASK);
+ req_dma = pci_map_page(ha->pdev, page, offset,
+ cmd->request_bufflen, cmd->sc_data_direction);
+
+ sp->dma_handle = req_dma;
+
+ *cur_dsd++ = cpu_to_le32(req_dma);
+ *cur_dsd++ = cpu_to_le32(cmd->request_bufflen);
+ }
+}
+
+/**
+ * qla2x00_build_scsi_iocbs_64() - Build IOCB command utilizing 64bit
+ * capable IOCB types.
+ *
+ * @sp: SRB command to process
+ * @cmd_pkt: Command type 3 IOCB
+ * @tot_dsds: Total number of segments to transfer
+ */
+void qla2x00_build_scsi_iocbs_64(srb_t *sp, cmd_entry_t *cmd_pkt,
+ uint16_t tot_dsds)
+{
+ uint16_t avail_dsds;
+ uint32_t *cur_dsd;
+ scsi_qla_host_t *ha;
+ struct scsi_cmnd *cmd;
+
+ cmd = sp->cmd;
+
+ /* Update entry type to indicate Command Type 3 IOCB */
+ *((uint32_t *)(&cmd_pkt->entry_type)) =
+ __constant_cpu_to_le32(COMMAND_A64_TYPE);
+
+ /* No data transfer */
+ if (cmd->request_bufflen == 0 || cmd->sc_data_direction == DMA_NONE) {
+ cmd_pkt->byte_count = __constant_cpu_to_le32(0);
+ return;
+ }
+
+ ha = sp->ha;
+
+ cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(cmd));
+
+ /* Two DSDs are available in the Command Type 3 IOCB */
+ avail_dsds = 2;
+ cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
+
+ /* Load data segments */
+ if (cmd->use_sg != 0) {
+ 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;
+ cont_a64_entry_t *cont_pkt;
+
+ /* Allocate additional continuation packets? */
+ if (avail_dsds == 0) {
+ /*
+ * Five DSDs are available in the Continuation
+ * Type 1 IOCB.
+ */
+ cont_pkt = qla2x00_prep_cont_type1_iocb(ha);
+ cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
+ avail_dsds = 5;
+ }
+
+ sle_dma = sg_dma_address(cur_seg);
+ *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
+ *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
+ *cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
+ avail_dsds--;
+
+ cur_seg++;
+ }
+ } else {
+ dma_addr_t req_dma;
+ struct page *page;
+ unsigned long offset;
+
+ page = virt_to_page(cmd->request_buffer);
+ offset = ((unsigned long)cmd->request_buffer & ~PAGE_MASK);
+ req_dma = pci_map_page(ha->pdev, page, offset,
+ cmd->request_bufflen, cmd->sc_data_direction);
+
+ sp->dma_handle = req_dma;
+
+ *cur_dsd++ = cpu_to_le32(LSD(req_dma));
+ *cur_dsd++ = cpu_to_le32(MSD(req_dma));
+ *cur_dsd++ = cpu_to_le32(cmd->request_bufflen);
+ }
+}
+
+/**
+ * qla2x00_start_scsi() - Send a SCSI command to the ISP
+ * @sp: command to send to the ISP
+ *
+ * Returns non-zero if a failure occured, else zero.
+ */
+int
+qla2x00_start_scsi(srb_t *sp)
+{
+ int ret;
+ unsigned long flags;
+ scsi_qla_host_t *ha;
+ fc_lun_t *fclun;
+ struct scsi_cmnd *cmd;
+ uint32_t *clr_ptr;
+ uint32_t index;
+ uint32_t handle;
+ cmd_entry_t *cmd_pkt;
+ uint32_t timeout;
+ struct scatterlist *sg;
+ uint16_t cnt;
+ uint16_t req_cnt;
+ uint16_t tot_dsds;
+ device_reg_t __iomem *reg;
+ char tag[2];
+
+ /* Setup device pointers. */
+ ret = 0;
+ fclun = sp->lun_queue->fclun;
+ ha = fclun->fcport->ha;
+ reg = ha->iobase;
+ cmd = sp->cmd;
+
+ /* Send marker if required */
+ if (ha->marker_needed != 0) {
+ if (qla2x00_marker(ha, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS) {
+ return (QLA_FUNCTION_FAILED);
+ }
+ ha->marker_needed = 0;
+ }
+
+ /* Acquire ring specific lock */
+ spin_lock_irqsave(&ha->hardware_lock, flags);
+
+ /* Check for room in outstanding command list. */
+ handle = ha->current_outstanding_cmd;
+ for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
+ handle++;
+ if (handle == MAX_OUTSTANDING_COMMANDS)
+ handle = 1;
+ if (ha->outstanding_cmds[handle] == 0)
+ break;
+ }
+ if (index == MAX_OUTSTANDING_COMMANDS)
+ goto queuing_error;
+
+ /* Calculate the number of request entries needed. */
+ req_cnt = (ha->calc_request_entries)(cmd->request->nr_hw_segments);
+ if (ha->req_q_cnt < (req_cnt + 2)) {
+ cnt = RD_REG_WORD_RELAXED(ISP_REQ_Q_OUT(ha, reg));
+ if (ha->req_ring_index < cnt)
+ ha->req_q_cnt = cnt - ha->req_ring_index;
+ else
+ ha->req_q_cnt = ha->request_q_length -
+ (ha->req_ring_index - cnt);
+ }
+ if (ha->req_q_cnt < (req_cnt + 2))
+ goto queuing_error;
+
+ /* Finally, we have enough space, now perform mappings. */
+ tot_dsds = 0;
+ 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) {
+ tot_dsds++;
+ }
+ req_cnt = (ha->calc_request_entries)(tot_dsds);
+
+ /* Build command packet */
+ ha->current_outstanding_cmd = handle;
+ ha->outstanding_cmds[handle] = sp;
+ sp->ha = ha;
+ sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
+ ha->req_q_cnt -= req_cnt;
+
+ cmd_pkt = (cmd_entry_t *)ha->request_ring_ptr;
+ cmd_pkt->handle = handle;
+ /* Zero out remaining portion of packet. */
+ clr_ptr = (uint32_t *)cmd_pkt + 2;
+ memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
+ cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
+
+ /* Set target ID */
+ SET_TARGET_ID(ha, cmd_pkt->target, fclun->fcport->loop_id);
+
+ /* Set LUN number*/
+ cmd_pkt->lun = cpu_to_le16(fclun->lun);
+
+ /* Update tagged queuing modifier */
+ cmd_pkt->control_flags = __constant_cpu_to_le16(CF_SIMPLE_TAG);
+ if (scsi_populate_tag_msg(cmd, tag)) {
+ switch (tag[0]) {
+ case MSG_HEAD_TAG:
+ cmd_pkt->control_flags =
+ __constant_cpu_to_le16(CF_HEAD_TAG);
+ break;
+ case MSG_ORDERED_TAG:
+ cmd_pkt->control_flags =
+ __constant_cpu_to_le16(CF_ORDERED_TAG);
+ break;
+ }
+ }
+
+ /*
+ * Allocate at least 5 (+ QLA_CMD_TIMER_DELTA) seconds for RISC timeout.
+ */
+ timeout = (uint32_t)(cmd->timeout_per_command / HZ);
+ if (timeout > 65535)
+ cmd_pkt->timeout = __constant_cpu_to_le16(0);
+ else if (timeout > 25)
+ cmd_pkt->timeout = cpu_to_le16((uint16_t)timeout -
+ (5 + QLA_CMD_TIMER_DELTA));
+ else
+ cmd_pkt->timeout = cpu_to_le16((uint16_t)timeout);
+
+ /* Load SCSI command packet. */
+ memcpy(cmd_pkt->scsi_cdb, cmd->cmnd, cmd->cmd_len);
+ cmd_pkt->byte_count = cpu_to_le32((uint32_t)cmd->request_bufflen);
+
+ /* Build IOCB segments */
+ (ha->build_scsi_iocbs)(sp, cmd_pkt, tot_dsds);
+
+ /* Set total data segment count. */
+ cmd_pkt->entry_count = (uint8_t)req_cnt;
+ wmb();
+
+ /* Adjust ring index. */
+ ha->req_ring_index++;
+ if (ha->req_ring_index == ha->request_q_length) {
+ ha->req_ring_index = 0;
+ ha->request_ring_ptr = ha->request_ring;
+ } else
+ ha->request_ring_ptr++;
+
+ ha->actthreads++;
+ ha->total_ios++;
+ sp->lun_queue->out_cnt++;
+ sp->flags |= SRB_DMA_VALID;
+ sp->state = SRB_ACTIVE_STATE;
+ sp->u_start = jiffies;
+
+ /* Set chip new ring index. */
+ WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), ha->req_ring_index);
+ RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg)); /* PCI Posting. */
+
+ spin_unlock_irqrestore(&ha->hardware_lock, flags);
+ return (QLA_SUCCESS);
+
+queuing_error:
+ spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+ return (QLA_FUNCTION_FAILED);
+}
+
+/**
+ * qla2x00_marker() - Send a marker IOCB to the firmware.
+ * @ha: HA context
+ * @loop_id: loop ID
+ * @lun: LUN
+ * @type: marker modifier
+ *
+ * Can be called from both normal and interrupt context.
+ *
+ * Returns non-zero if a failure occured, else zero.
+ */
+int
+__qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun,
+ uint8_t type)
+{
+ mrk_entry_t *pkt;
+
+ pkt = (mrk_entry_t *)qla2x00_req_pkt(ha);
+ if (pkt == NULL) {
+ DEBUG2_3(printk("%s(): **** FAILED ****\n", __func__));
+
+ return (QLA_FUNCTION_FAILED);
+ }
+
+ pkt->entry_type = MARKER_TYPE;
+ pkt->modifier = type;
+
+ if (type != MK_SYNC_ALL) {
+ pkt->lun = cpu_to_le16(lun);
+ SET_TARGET_ID(ha, pkt->target, loop_id);
+ }
+ wmb();
+
+ /* Issue command to ISP */
+ qla2x00_isp_cmd(ha);
+
+ return (QLA_SUCCESS);
+}
+
+int
+qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun,
+ uint8_t type)
+{
+ int ret;
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(&ha->hardware_lock, flags);
+ ret = __qla2x00_marker(ha, loop_id, lun, type);
+ spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+ return (ret);
+}
+
+/**
+ * qla2x00_req_pkt() - Retrieve a request packet from the request ring.
+ * @ha: HA context
+ *
+ * Note: The caller must hold the hardware lock before calling this routine.
+ *
+ * Returns NULL if function failed, else, a pointer to the request packet.
+ */
+static request_t *
+qla2x00_req_pkt(scsi_qla_host_t *ha)
+{
+ device_reg_t __iomem *reg = ha->iobase;
+ request_t *pkt = NULL;
+ uint16_t cnt;
+ uint32_t *dword_ptr;
+ uint32_t timer;
+ uint16_t req_cnt = 1;
+
+ /* Wait 1 second for slot. */
+ for (timer = HZ; timer; timer--) {
+ if ((req_cnt + 2) >= ha->req_q_cnt) {
+ /* Calculate number of free request entries. */
+ cnt = qla2x00_debounce_register(ISP_REQ_Q_OUT(ha, reg));
+ if (ha->req_ring_index < cnt)
+ ha->req_q_cnt = cnt - ha->req_ring_index;
+ else
+ ha->req_q_cnt = ha->request_q_length -
+ (ha->req_ring_index - cnt);
+ }
+ /* If room for request in request ring. */
+ if ((req_cnt + 2) < ha->req_q_cnt) {
+ ha->req_q_cnt--;
+ pkt = ha->request_ring_ptr;
+
+ /* Zero out packet. */
+ dword_ptr = (uint32_t *)pkt;
+ for (cnt = 0; cnt < REQUEST_ENTRY_SIZE / 4; cnt++)
+ *dword_ptr++ = 0;
+
+ /* Set system defined field. */
+ pkt->sys_define = (uint8_t)ha->req_ring_index;
+
+ /* Set entry count. */
+ pkt->entry_count = 1;
+
+ break;
+ }
+
+ /* Release ring specific lock */
+ spin_unlock(&ha->hardware_lock);
+
+ udelay(2); /* 2 us */
+
+ /* Check for pending interrupts. */
+ /* During init we issue marker directly */
+ if (!ha->marker_needed)
+ qla2x00_poll(ha);
+
+ spin_lock_irq(&ha->hardware_lock);
+ }
+ if (!pkt) {
+ DEBUG2_3(printk("%s(): **** FAILED ****\n", __func__));
+ }
+
+ return (pkt);
+}
+
+/**
+ * qla2x00_isp_cmd() - Modify the request ring pointer.
+ * @ha: HA context
+ *
+ * Note: The caller must hold the hardware lock before calling this routine.
+ */
+void
+qla2x00_isp_cmd(scsi_qla_host_t *ha)
+{
+ device_reg_t __iomem *reg = ha->iobase;
+
+ DEBUG5(printk("%s(): IOCB data:\n", __func__));
+ DEBUG5(qla2x00_dump_buffer(
+ (uint8_t *)ha->request_ring_ptr, REQUEST_ENTRY_SIZE));
+
+ /* Adjust ring index. */
+ ha->req_ring_index++;
+ if (ha->req_ring_index == ha->request_q_length) {
+ ha->req_ring_index = 0;
+ ha->request_ring_ptr = ha->request_ring;
+ } else
+ ha->request_ring_ptr++;
+
+ /* Set chip new ring index. */
+ WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), ha->req_ring_index);
+ RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg)); /* PCI Posting. */
+}
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-24 22:22:00 +0300