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scsi: qla2xxx: use shadow register for ISP27XX

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For ISP27XX, use shadow register to read FW provided REQQ's consumer
index.  The shadow register is dma'ed by firmware.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Quinn Tran 2017-06-13 20:47:23 -07:00 committed by Martin K. Petersen
parent 7c3f8fd10b
commit af7bb3826a
4 changed files with 5 additions and 1 deletions
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1
drivers/scsi/qla2xxx/qla_def.h
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@ -3266,6 +3266,7 @@ struct qla_qpair {
uint32_t fw_started:1;
uint32_t enable_class_2:1;
uint32_t enable_explicit_conf:1;
uint32_t use_shadow_reg:1;
uint16_t id; /* qp number used with FW */
uint16_t vp_idx; /* vport ID */

1
drivers/scsi/qla2xxx/qla_init.c
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@ -7614,6 +7614,7 @@ struct qla_qpair *qla2xxx_create_qpair(struct scsi_qla_host *vha, int qos,
qpair->vha = vha;
qpair->qp_lock_ptr = &qpair->qp_lock;
spin_lock_init(&qpair->qp_lock);
qpair->use_shadow_reg = IS_SHADOW_REG_CAPABLE(ha) ? 1 : 0;
/* Assign available que pair id */
mutex_lock(&ha->mq_lock);

1
drivers/scsi/qla2xxx/qla_os.c
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@ -384,6 +384,7 @@ static int qla2x00_alloc_queues(struct qla_hw_data *ha, struct req_que *req,
ha->base_qpair->rsp = rsp;
ha->base_qpair->vha = vha;
ha->base_qpair->qp_lock_ptr = &ha->hardware_lock;
ha->base_qpair->use_shadow_reg = IS_SHADOW_REG_CAPABLE(ha) ? 1 : 0;
/* init qpair to this cpu. Will adjust at run time. */
ha->base_qpair->msix = &ha->msix_entries[QLA_MSIX_RSP_Q];
INIT_LIST_HEAD(&ha->base_qpair->hints_list);

3
drivers/scsi/qla2xxx/qla_target.c
View File

@ -2288,7 +2288,8 @@ static int qlt_check_reserve_free_req(struct qla_qpair *qpair,
struct req_que *req = qpair->req;
if (req->cnt < (req_cnt + 2)) {
cnt = (uint16_t)RD_REG_DWORD(req->req_q_out);
cnt = (uint16_t)(qpair->use_shadow_reg ? *req->out_ptr :
RD_REG_DWORD_RELAXED(req->req_q_out));
if (req->ring_index < cnt)
req->cnt = cnt - req->ring_index;