From: Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx>
The workqueue is currently single threaded per port which for a small number of
SDMA engines is ok.
For hfi1, the there are up to 16 SDMA engines that can be fed descriptors in
parallel.
Use alloc_workqueue with a workqueue limit of the number of sdma engines and
with WQ_CPU_INTENSIVE and WQ_HIGHPRI specified.
Then change send to use the new scheduler which no longer needs to get the
s_lock
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx>
Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
---
Changes from v3:
Split patch out code refactoring and separate functionality
This patch was previously sent as #8/9 but 5/9 failed.
I'm resending 7,8, and 9 as they did not explicitly depend on 5 and 6.
drivers/staging/rdma/hfi1/chip.c | 1 +
drivers/staging/rdma/hfi1/init.c | 13 ++++++-------
drivers/staging/rdma/hfi1/iowait.h | 6 ++++--
drivers/staging/rdma/hfi1/qp.h | 35 +++++++++++++++++++++++++++++++++++
drivers/staging/rdma/hfi1/sdma.c | 8 +++++---
drivers/staging/rdma/hfi1/sdma.h | 8 +++++---
drivers/staging/rdma/hfi1/verbs.c | 20 ++++----------------
drivers/staging/rdma/hfi1/verbs.h | 1 -
8 files changed, 60 insertions(+), 32 deletions(-)
diff --git a/drivers/staging/rdma/hfi1/chip.c b/drivers/staging/rdma/hfi1/chip.c
index e48981994b10..b7c7d1cac4e1 100644
--- a/drivers/staging/rdma/hfi1/chip.c
+++ b/drivers/staging/rdma/hfi1/chip.c
@@ -9018,6 +9018,7 @@ static int request_msix_irqs(struct hfi1_devdata *dd)
if (handler == sdma_interrupt) {
dd_dev_info(dd, "sdma engine %d cpu %d\n",
sde->this_idx, sdma_cpu);
+ sde->cpu = sdma_cpu;
cpumask_set_cpu(sdma_cpu, dd->msix_entries[i].mask);
sdma_cpu = cpumask_next(sdma_cpu, def);
if (sdma_cpu >= nr_cpu_ids)
diff --git a/drivers/staging/rdma/hfi1/init.c b/drivers/staging/rdma/hfi1/init.c
index 47a1202fcbdf..69dfa3a65fc6 100644
--- a/drivers/staging/rdma/hfi1/init.c
+++ b/drivers/staging/rdma/hfi1/init.c
@@ -601,20 +601,19 @@ static int create_workqueues(struct hfi1_devdata *dd)
for (pidx = 0; pidx < dd->num_pports; ++pidx) {
ppd = dd->pport + pidx;
if (!ppd->hfi1_wq) {
- char wq_name[8]; /* 3 + 2 + 1 + 1 + 1 */
-
- snprintf(wq_name, sizeof(wq_name), "hfi%d_%d",
- dd->unit, pidx);
ppd->hfi1_wq =
- create_singlethread_workqueue(wq_name);
+ alloc_workqueue(
+ "hfi%d_%d",
+ WQ_SYSFS | WQ_HIGHPRI | WQ_CPU_INTENSIVE,
+ dd->num_sdma,
+ dd->unit, pidx);
if (!ppd->hfi1_wq)
goto wq_error;
}
}
return 0;
wq_error:
- pr_err("create_singlethread_workqueue failed for port %d\n",
- pidx + 1);
+ pr_err("alloc_workqueue failed for port %d\n", pidx + 1);
for (pidx = 0; pidx < dd->num_pports; ++pidx) {
ppd = dd->pport + pidx;
if (ppd->hfi1_wq) {
diff --git a/drivers/staging/rdma/hfi1/iowait.h b/drivers/staging/rdma/hfi1/iowait.h
index fa361b405851..e8ba5606d08d 100644
--- a/drivers/staging/rdma/hfi1/iowait.h
+++ b/drivers/staging/rdma/hfi1/iowait.h
@@ -150,12 +150,14 @@ static inline void iowait_init(
* iowait_schedule() - initialize wait structure
* @wait: wait struct to schedule
* @wq: workqueue for schedule
+ * @cpu: cpu
*/
static inline void iowait_schedule(
struct iowait *wait,
- struct workqueue_struct *wq)
+ struct workqueue_struct *wq,
+ int cpu)
{
- queue_work(wq, &wait->iowork);
+ queue_work_on(cpu, wq, &wait->iowork);
}
/**
diff --git a/drivers/staging/rdma/hfi1/qp.h b/drivers/staging/rdma/hfi1/qp.h
index bacfa9c5e8a8..e49cfa6e59e0 100644
--- a/drivers/staging/rdma/hfi1/qp.h
+++ b/drivers/staging/rdma/hfi1/qp.h
@@ -247,6 +247,41 @@ void qp_iter_print(struct seq_file *s, struct qp_iter *iter);
*/
void qp_comm_est(struct hfi1_qp *qp);
+/**
+ * _hfi1_schedule_send - schedule progress
+ * @qp: the QP
+ *
+ * This schedules qp progress w/o regard to the s_flags.
+ *
+ * It is only used in the post send, which doesn't hold
+ * the s_lock.
+ */
+static inline void _hfi1_schedule_send(struct hfi1_qp *qp)
+{
+ struct hfi1_ibport *ibp =
+ to_iport(qp->ibqp.device, qp->port_num);
+ struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
+ struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
+
+ iowait_schedule(&qp->s_iowait, ppd->hfi1_wq,
+ qp->s_sde ?
+ qp->s_sde->cpu :
+ cpumask_first(cpumask_of_node(dd->assigned_node_id)));
+}
+
+/**
+ * hfi1_schedule_send - schedule progress
+ * @qp: the QP
+ *
+ * This schedules qp progress and caller should hold
+ * the s_lock.
+ */
+static inline void hfi1_schedule_send(struct hfi1_qp *qp)
+{
+ if (hfi1_send_ok(qp))
+ _hfi1_schedule_send(qp);
+}
+
void hfi1_migrate_qp(struct hfi1_qp *qp);
#endif /* _QP_H */
diff --git a/drivers/staging/rdma/hfi1/sdma.c b/drivers/staging/rdma/hfi1/sdma.c
index 2a1da2189900..ddef98d7e6ac 100644
--- a/drivers/staging/rdma/hfi1/sdma.c
+++ b/drivers/staging/rdma/hfi1/sdma.c
@@ -778,18 +778,19 @@ struct sdma_engine *sdma_select_engine_vl(
struct sdma_engine *rval;
if (WARN_ON(vl > 8))
- return NULL;
+ return &dd->per_sdma[0];
rcu_read_lock();
m = rcu_dereference(dd->sdma_map);
if (unlikely(!m)) {
rcu_read_unlock();
- return NULL;
+ return &dd->per_sdma[0];
}
e = m->map[vl & m->mask];
rval = e->sde[selector & e->mask];
rcu_read_unlock();
+ rval = !rval ? &dd->per_sdma[0] : rval;
trace_hfi1_sdma_engine_select(dd, selector, vl, rval->this_idx);
return rval;
}
@@ -1874,7 +1875,7 @@ static void dump_sdma_state(struct sdma_engine *sde)
}
#define SDE_FMT \
- "SDE %u STE %s C 0x%llx S 0x%016llx E 0x%llx T(HW) 0x%llx T(SW) 0x%x H(HW) 0x%llx H(SW) 0x%x H(D) 0x%llx DM 0x%llx GL 0x%llx R 0x%llx LIS 0x%llx AHGI 0x%llx TXT %u TXH %u DT %u DH %u FLNE %d DQF %u SLC 0x%llx\n"
+ "SDE %u CPU %d STE %s C 0x%llx S 0x%016llx E 0x%llx T(HW) 0x%llx T(SW) 0x%x H(HW) 0x%llx H(SW) 0x%x H(D) 0x%llx DM 0x%llx GL 0x%llx R 0x%llx LIS 0x%llx AHGI 0x%llx TXT %u TXH %u DT %u DH %u FLNE %d DQF %u SLC 0x%llx\n"
/**
* sdma_seqfile_dump_sde() - debugfs dump of sde
* @s: seq file
@@ -1894,6 +1895,7 @@ void sdma_seqfile_dump_sde(struct seq_file *s, struct sdma_engine *sde)
head = sde->descq_head & sde->sdma_mask;
tail = ACCESS_ONCE(sde->descq_tail) & sde->sdma_mask;
seq_printf(s, SDE_FMT, sde->this_idx,
+ sde->cpu,
sdma_state_name(sde->state.current_state),
(unsigned long long)read_sde_csr(sde, SD(CTRL)),
(unsigned long long)read_sde_csr(sde, SD(STATUS)),
diff --git a/drivers/staging/rdma/hfi1/sdma.h b/drivers/staging/rdma/hfi1/sdma.h
index cc22d2ee2054..85701eed1585 100644
--- a/drivers/staging/rdma/hfi1/sdma.h
+++ b/drivers/staging/rdma/hfi1/sdma.h
@@ -410,8 +410,6 @@ struct sdma_engine {
u64 idle_mask;
u64 progress_mask;
/* private: */
- struct workqueue_struct *wq;
- /* private: */
volatile __le64 *head_dma; /* DMA'ed by chip */
/* private: */
dma_addr_t head_phys;
@@ -426,6 +424,8 @@ struct sdma_engine {
u32 sdma_mask;
/* private */
struct sdma_state state;
+ /* private */
+ int cpu;
/* private: */
u8 sdma_shift;
/* private: */
@@ -990,7 +990,9 @@ static inline void sdma_iowait_schedule(
struct sdma_engine *sde,
struct iowait *wait)
{
- iowait_schedule(wait, sde->wq);
+ struct hfi1_pportdata *ppd = sde->dd->pport;
+
+ iowait_schedule(wait, ppd->hfi1_wq, sde->cpu);
}
/* for use by interrupt handling */
diff --git a/drivers/staging/rdma/hfi1/verbs.c b/drivers/staging/rdma/hfi1/verbs.c
index b31588264ca0..9145681f08ea 100644
--- a/drivers/staging/rdma/hfi1/verbs.c
+++ b/drivers/staging/rdma/hfi1/verbs.c
@@ -162,6 +162,8 @@ static inline struct hfi1_ucontext *to_iucontext(struct ib_ucontext
return container_of(ibucontext, struct hfi1_ucontext, ibucontext);
}
+static inline void _hfi1_schedule_send(struct hfi1_qp *qp);
+
/*
* Translate ib_wr_opcode into ib_wc_opcode.
*/
@@ -497,9 +499,9 @@ static int post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
nreq++;
}
bail:
- if (nreq && !call_send)
- hfi1_schedule_send(qp);
spin_unlock_irqrestore(&qp->s_lock, flags);
+ if (nreq && !call_send)
+ _hfi1_schedule_send(qp);
if (nreq && call_send)
hfi1_do_send(&qp->s_iowait.iowork);
return err;
@@ -2125,20 +2127,6 @@ void hfi1_unregister_ib_device(struct hfi1_devdata *dd)
vfree(dev->lk_table.table);
}
-/*
- * This must be called with s_lock held.
- */
-void hfi1_schedule_send(struct hfi1_qp *qp)
-{
- if (hfi1_send_ok(qp)) {
- struct hfi1_ibport *ibp =
- to_iport(qp->ibqp.device, qp->port_num);
- struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
-
- iowait_schedule(&qp->s_iowait, ppd->hfi1_wq);
- }
-}
-
void hfi1_cnp_rcv(struct hfi1_packet *packet)
{
struct hfi1_ibport *ibp = &packet->rcd->ppd->ibport_data;
diff --git a/drivers/staging/rdma/hfi1/verbs.h b/drivers/staging/rdma/hfi1/verbs.h
index 9555aab51530..fb8ea5c892c6 100644
--- a/drivers/staging/rdma/hfi1/verbs.h
+++ b/drivers/staging/rdma/hfi1/verbs.h
@@ -841,7 +841,6 @@ static inline int hfi1_send_ok(struct hfi1_qp *qp)
/*
* This must be called with s_lock held.
*/
-void hfi1_schedule_send(struct hfi1_qp *qp);
void hfi1_bad_pqkey(struct hfi1_ibport *ibp, __be16 trap_num, u32 key, u32 sl,
u32 qp1, u32 qp2, __be16 lid1, __be16 lid2);
void hfi1_cap_mask_chg(struct hfi1_ibport *ibp);
--
1.8.2
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