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linux/drivers/scsi/qla2xxx/qla_iocb.c

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/*
* QLogic Fibre Channel HBA Driver
* Copyright (c) 2003-2005 QLogic Corporation
*
* See LICENSE.qla2xxx for copyright and licensing 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);
static void qla2x00_isp_cmd(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 {
*cur_dsd++ = cpu_to_le32(sp->dma_handle);
*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 {
*cur_dsd++ = cpu_to_le32(LSD(sp->dma_handle));
*cur_dsd++ = cpu_to_le32(MSD(sp->dma_handle));
*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;
struct scsi_cmnd *cmd;
uint32_t *clr_ptr;
uint32_t index;
uint32_t handle;
cmd_entry_t *cmd_pkt;
struct scatterlist *sg;
uint16_t cnt;
uint16_t req_cnt;
uint16_t tot_dsds;
struct device_reg_2xxx __iomem *reg;
/* Setup device pointers. */
ret = 0;
ha = sp->ha;
reg = &ha->iobase->isp;
cmd = sp->cmd;
/* So we know we haven't pci_map'ed anything yet */
tot_dsds = 0;
/* 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;
/* Map the sg table so we have an accurate count of sg 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;
sp->dma_handle = req_dma;
tot_dsds = 1;
}
/* Calculate the number of request entries needed. */
req_cnt = ha->isp_ops.calc_req_entries(tot_dsds);
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;
/* 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 and LUN number*/
SET_TARGET_ID(ha, cmd_pkt->target, sp->fcport->loop_id);
cmd_pkt->lun = cpu_to_le16(sp->cmd->device->lun);
/* Update tagged queuing modifier */
cmd_pkt->control_flags = __constant_cpu_to_le16(CF_SIMPLE_TAG);
/* 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->isp_ops.build_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++;
sp->flags |= SRB_DMA_VALID;
/* 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. */
/* Manage unprocessed RIO/ZIO commands in response queue. */
if (ha->flags.process_response_queue &&
ha->response_ring_ptr->signature != RESPONSE_PROCESSED)
qla2x00_process_response_queue(ha);
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, sp->dma_handle,
cmd->request_bufflen, cmd->sc_data_direction);
}
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 *mrk;
struct mrk_entry_24xx *mrk24;
mrk24 = NULL;
mrk = (mrk_entry_t *)qla2x00_req_pkt(ha);
if (mrk == NULL) {
DEBUG2_3(printk("%s(%ld): failed to allocate Marker IOCB.\n",
__func__, ha->host_no));
return (QLA_FUNCTION_FAILED);
}
mrk->entry_type = MARKER_TYPE;
mrk->modifier = type;
if (type != MK_SYNC_ALL) {
if (IS_QLA24XX(ha) || IS_QLA54XX(ha)) {
mrk24 = (struct mrk_entry_24xx *) mrk;
mrk24->nport_handle = cpu_to_le16(loop_id);
mrk24->lun[1] = LSB(lun);
mrk24->lun[2] = MSB(lun);
host_to_fcp_swap(mrk24->lun, sizeof(mrk24->lun));
} else {
SET_TARGET_ID(ha, mrk->target, loop_id);
mrk->lun = cpu_to_le16(lun);
}
}
wmb();
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. */
if (IS_QLA24XX(ha) || IS_QLA54XX(ha))
cnt = (uint16_t)RD_REG_DWORD(
&reg->isp24.req_q_out);
else
cnt = qla2x00_debounce_register(
ISP_REQ_Q_OUT(ha, &reg->isp));
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.
*/
static 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. */
if (IS_QLA24XX(ha) || IS_QLA54XX(ha)) {
WRT_REG_DWORD(&reg->isp24.req_q_in, ha->req_ring_index);
RD_REG_DWORD_RELAXED(&reg->isp24.req_q_in);
} else {
WRT_REG_WORD(ISP_REQ_Q_IN(ha, &reg->isp), ha->req_ring_index);
RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, &reg->isp));
}
}
/**
* qla24xx_calc_iocbs() - 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.
*/
static inline uint16_t
qla24xx_calc_iocbs(uint16_t dsds)
{
uint16_t iocbs;
iocbs = 1;
if (dsds > 1) {
iocbs += (dsds - 1) / 5;
if ((dsds - 1) % 5)
iocbs++;
}
return iocbs;
}
/**
* qla24xx_build_scsi_iocbs() - Build IOCB command utilizing Command Type 7
* IOCB types.
*
* @sp: SRB command to process
* @cmd_pkt: Command type 3 IOCB
* @tot_dsds: Total number of segments to transfer
*/
static inline void
qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *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_TYPE_7);
/* 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;
/* Set transfer direction */
if (cmd->sc_data_direction == DMA_TO_DEVICE)
cmd_pkt->task_mgmt_flags =
__constant_cpu_to_le16(TMF_WRITE_DATA);
else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
cmd_pkt->task_mgmt_flags =
__constant_cpu_to_le16(TMF_READ_DATA);
/* One DSD is available in the Command Type 3 IOCB */
avail_dsds = 1;
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 {
*cur_dsd++ = cpu_to_le32(LSD(sp->dma_handle));
*cur_dsd++ = cpu_to_le32(MSD(sp->dma_handle));
*cur_dsd++ = cpu_to_le32(cmd->request_bufflen);
}
}
/**
* qla24xx_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
qla24xx_start_scsi(srb_t *sp)
{
int ret;
unsigned long flags;
scsi_qla_host_t *ha;
struct scsi_cmnd *cmd;
uint32_t *clr_ptr;
uint32_t index;
uint32_t handle;
struct cmd_type_7 *cmd_pkt;
struct scatterlist *sg;
uint16_t cnt;
uint16_t req_cnt;
uint16_t tot_dsds;
struct device_reg_24xx __iomem *reg;
/* Setup device pointers. */
ret = 0;
ha = sp->ha;
reg = &ha->iobase->isp24;
cmd = sp->cmd;
/* So we know we haven't pci_map'ed anything yet */
tot_dsds = 0;
/* 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;
/* Map the sg table so we have an accurate count of sg 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;
sp->dma_handle = req_dma;
tot_dsds = 1;
}
req_cnt = qla24xx_calc_iocbs(tot_dsds);
if (ha->req_q_cnt < (req_cnt + 2)) {
cnt = (uint16_t)RD_REG_DWORD_RELAXED(&reg->req_q_out);
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;
/* 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 = (struct cmd_type_7 *)ha->request_ring_ptr;
cmd_pkt->handle = handle;
/* Zero out remaining portion of packet. */
/* tagged queuing modifier -- default is TSK_SIMPLE (0). */
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 NPORT-ID and LUN number*/
cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
int_to_scsilun(sp->cmd->device->lun, &cmd_pkt->lun);
host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun));
/* Load SCSI command packet. */
memcpy(cmd_pkt->fcp_cdb, cmd->cmnd, cmd->cmd_len);
host_to_fcp_swap(cmd_pkt->fcp_cdb, sizeof(cmd_pkt->fcp_cdb));
cmd_pkt->byte_count = cpu_to_le32((uint32_t)cmd->request_bufflen);
/* Build IOCB segments */
qla24xx_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++;
sp->flags |= SRB_DMA_VALID;
/* Set chip new ring index. */
WRT_REG_DWORD(&reg->req_q_in, ha->req_ring_index);
RD_REG_DWORD_RELAXED(&reg->req_q_in); /* PCI Posting. */
/* Manage unprocessed RIO/ZIO commands in response queue. */
if (ha->flags.process_response_queue &&
ha->response_ring_ptr->signature != RESPONSE_PROCESSED)
qla24xx_process_response_queue(ha);
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, sp->dma_handle,
cmd->request_bufflen, cmd->sc_data_direction);
}
spin_unlock_irqrestore(&ha->hardware_lock, flags);
return QLA_FUNCTION_FAILED;
}
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