Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

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 00000000000..ec066074c72
--- /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. */
+}