diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/qla2xxx/qla_iocb.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
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!
Diffstat (limited to 'drivers/scsi/qla2xxx/qla_iocb.c')
-rw-r--r-- | drivers/scsi/qla2xxx/qla_iocb.c | 633 |
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 0000000..ec06607 --- /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. */ +} |