gpu: host1x: hw: intr_hw: Remove create_workqueue

System workqueues have been able to handle high level of concurrency
for a long time now and there's no reason to use dedicated workqueues
just to gain concurrency. Since the workqueue host->intr_wq is involved
in sync point interrupts, and sync point wait and is not being used on
a memory reclaim path, dedicated host->intr_wq has been replaced with the
use of system_wq.

Unlike a dedicated per-cpu workqueue created with create_workqueue(),
system_wq allows multiple work items to overlap executions even on
the same CPU; however, a per-cpu workqueue doesn't have any CPU
locality or global ordering guarantees unless the target CPU is
explicitly specified and thus the increase of local concurrency
shouldn't make any difference.

cancel_work_sync() has been used  in _host1x_free_syncpt_irq() to ensure
that no work is pending by the time exit path runs.

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

3 files changed, 6 insertions, 7 deletions

diff --git a/drivers/gpu/host1x/dev.h b/drivers/gpu/host1x/dev.h
index dace124994bb..136c3a9d4997 100644
--- a/drivers/gpu/host1x/dev.h
+++ b/drivers/gpu/host1x/dev.h
@@ -109,7 +109,6 @@ struct host1x {
         struct clk *clk;
 
         struct mutex intr_mutex;
-        struct workqueue_struct *intr_wq;
         int intr_syncpt_irq;
 
         const struct host1x_syncpt_ops *syncpt_op;
diff --git a/drivers/gpu/host1x/hw/intr_hw.c b/drivers/gpu/host1x/hw/intr_hw.c
index e1e31e9e67cd..10f81687b566 100644
--- a/drivers/gpu/host1x/hw/intr_hw.c
+++ b/drivers/gpu/host1x/hw/intr_hw.c
@@ -38,7 +38,7 @@ static void host1x_intr_syncpt_handle(struct host1x_syncpt *syncpt)
         host1x_sync_writel(host, BIT_MASK(id),
                 HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(BIT_WORD(id)));
 
-        queue_work(host->intr_wq, &syncpt->intr.work);
+        schedule_work(&syncpt->intr.work);
 }
 
 static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id)
@@ -127,8 +127,12 @@ static void _host1x_intr_disable_syncpt_intr(struct host1x *host, u32 id)
 
 static int _host1x_free_syncpt_irq(struct host1x *host)
 {
+        int i;
+
         devm_free_irq(host->dev, host->intr_syncpt_irq, host);
-        flush_workqueue(host->intr_wq);
+
+        for (i = 0; i < host->info->nb_pts; i++)
+                cancel_work_sync(&host->syncpt[i].intr.work);
         return 0;
 }
 
diff --git a/drivers/gpu/host1x/intr.c b/drivers/gpu/host1x/intr.c
index 2491bf82e30c..81de286a2f60 100644
--- a/drivers/gpu/host1x/intr.c
+++ b/drivers/gpu/host1x/intr.c
@@ -277,9 +277,6 @@ int host1x_intr_init(struct host1x *host, unsigned int irq_sync)
 
         mutex_init(&host->intr_mutex);
         host->intr_syncpt_irq = irq_sync;
-        host->intr_wq = create_workqueue("host_syncpt");
-        if (!host->intr_wq)
-                return -ENOMEM;
 
         for (id = 0; id < nb_pts; ++id) {
                 struct host1x_syncpt *syncpt = host->syncpt + id;
@@ -299,7 +296,6 @@ int host1x_intr_init(struct host1x *host, unsigned int irq_sync)
 void host1x_intr_deinit(struct host1x *host)
 {
         host1x_intr_stop(host);
-        destroy_workqueue(host->intr_wq);
 }
 
 void host1x_intr_start(struct host1x *host)