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IB/srp: stop sharing the host lock with SCSI 

We don't need protection against the SCSI stack, so use our own lock to
allow parallel progress on separate CPUs.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
[ broken out and small cleanups by David Dillow ]
Signed-off-by: David Dillow <dillowda@ornl.gov>
This commit is contained in:
Bart Van Assche 2010-11-26 15:08:38 -05:00 committed by David Dillow
parent 94a9174c63
commit e968467822
2 changed files with 25 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
drivers/infiniband/ulp/srp/ib_srp.c
View File

@ -447,12 +447,12 @@ static bool srp_change_state(struct srp_target_port *target,
{
bool changed = false;
spin_lock_irq(target->scsi_host->host_lock);
spin_lock_irq(&target->lock);
if (target->state == old) {
target->state = new;
changed = true;
}
spin_unlock_irq(target->scsi_host->host_lock);
spin_unlock_irq(&target->lock);
return changed;
}
@ -555,11 +555,11 @@ static void srp_remove_req(struct srp_target_port *target,
unsigned long flags;
srp_unmap_data(req->scmnd, target, req);
spin_lock_irqsave(target->scsi_host->host_lock, flags);
spin_lock_irqsave(&target->lock, flags);
target->req_lim += req_lim_delta;
req->scmnd = NULL;
list_add_tail(&req->list, &target->free_reqs);
spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
spin_unlock_irqrestore(&target->lock, flags);
}
static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
@ -634,13 +634,13 @@ err:
* Schedule our work inside the lock to avoid a race with
* the flush_scheduled_work() in srp_remove_one().
*/
spin_lock_irq(target->scsi_host->host_lock);
spin_lock_irq(&target->lock);
if (target->state == SRP_TARGET_CONNECTING) {
target->state = SRP_TARGET_DEAD;
INIT_WORK(&target->work, srp_remove_work);
schedule_work(&target->work);
}
spin_unlock_irq(target->scsi_host->host_lock);
spin_unlock_irq(&target->lock);
return ret;
}
@ -829,17 +829,16 @@ static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
{
unsigned long flags;
spin_lock_irqsave(target->scsi_host->host_lock, flags);
spin_lock_irqsave(&target->lock, flags);
list_add(&iu->list, &target->free_tx);
if (iu_type != SRP_IU_RSP)
++target->req_lim;
spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
spin_unlock_irqrestore(&target->lock, flags);
}
/*
* Must be called with target->scsi_host->host_lock held to protect
* req_lim and free_tx. If IU is not sent, it must be returned using
* srp_put_tx_iu().
* Must be called with target->lock held to protect req_lim and free_tx.
* If IU is not sent, it must be returned using srp_put_tx_iu().
*
* Note:
* An upper limit for the number of allocated information units for each
@ -920,9 +919,9 @@ static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
unsigned long flags;
if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
spin_lock_irqsave(target->scsi_host->host_lock, flags);
spin_lock_irqsave(&target->lock, flags);
target->req_lim += be32_to_cpu(rsp->req_lim_delta);
spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
spin_unlock_irqrestore(&target->lock, flags);
target->tsk_mgmt_status = -1;
if (be32_to_cpu(rsp->resp_data_len) >= 4)
@ -963,10 +962,10 @@ static int srp_response_common(struct srp_target_port *target, s32 req_delta,
struct srp_iu *iu;
int err;
spin_lock_irqsave(target->scsi_host->host_lock, flags);
spin_lock_irqsave(&target->lock, flags);
target->req_lim += req_delta;
iu = __srp_get_tx_iu(target, SRP_IU_RSP);
spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
spin_unlock_irqrestore(&target->lock, flags);
if (!iu) {
shost_printk(KERN_ERR, target->scsi_host, PFX
@ -1131,14 +1130,14 @@ static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
return 0;
}
spin_lock_irqsave(shost->host_lock, flags);
spin_lock_irqsave(&target->lock, flags);
iu = __srp_get_tx_iu(target, SRP_IU_CMD);
if (iu) {
req = list_first_entry(&target->free_reqs, struct srp_request,
list);
list_del(&req->list);
}
spin_unlock_irqrestore(shost->host_lock, flags);
spin_unlock_irqrestore(&target->lock, flags);
if (!iu)
goto err;
@ -1184,9 +1183,9 @@ err_unmap:
err_iu:
srp_put_tx_iu(target, iu, SRP_IU_CMD);
spin_lock_irqsave(shost->host_lock, flags);
spin_lock_irqsave(&target->lock, flags);
list_add(&req->list, &target->free_reqs);
spin_unlock_irqrestore(shost->host_lock, flags);
spin_unlock_irqrestore(&target->lock, flags);
err:
return SCSI_MLQUEUE_HOST_BUSY;
@ -1451,9 +1450,9 @@ static int srp_send_tsk_mgmt(struct srp_target_port *target,
init_completion(&target->tsk_mgmt_done);
spin_lock_irq(target->scsi_host->host_lock);
spin_lock_irq(&target->lock);
iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
spin_unlock_irq(target->scsi_host->host_lock);
spin_unlock_irq(&target->lock);
if (!iu)
return -1;
@ -1957,6 +1956,7 @@ static ssize_t srp_create_target(struct device *dev,
target->scsi_host = target_host;
target->srp_host = host;
spin_lock_init(&target->lock);
INIT_LIST_HEAD(&target->free_tx);
INIT_LIST_HEAD(&target->free_reqs);
for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
@ -2186,9 +2186,9 @@ static void srp_remove_one(struct ib_device *device)
*/
spin_lock(&host->target_lock);
list_for_each_entry(target, &host->target_list, list) {
spin_lock_irq(target->scsi_host->host_lock);
spin_lock_irq(&target->lock);
target->state = SRP_TARGET_REMOVED;
spin_unlock_irq(target->scsi_host->host_lock);
spin_unlock_irq(&target->lock);
}
spin_unlock(&host->target_lock);

2
drivers/infiniband/ulp/srp/ib_srp.h
View File

@ -144,6 +144,8 @@ struct srp_target_port {
struct srp_iu *rx_ring[SRP_RQ_SIZE];
spinlock_t lock;
struct list_head free_tx;
struct srp_iu *tx_ring[SRP_SQ_SIZE];