Sometimes it is desirable to queue work up for later if the GT PM isn't
held and run that work on next GT PM unpark.
Implemented with a list in the GT of all pending work, workqueues in
the list, a callback to add a workqueue to the list, and finally a
wakeref post_get callback that iterates / drains the list + queues the
workqueues.
First user of this is deregistration of GuC contexts.
Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_gt.c | 3 ++
drivers/gpu/drm/i915/gt/intel_gt_pm.c | 8 +++++
.../gpu/drm/i915/gt/intel_gt_pm_unpark_work.c | 35 +++++++++++++++++++
.../gpu/drm/i915/gt/intel_gt_pm_unpark_work.h | 32 +++++++++++++++++
drivers/gpu/drm/i915/gt/intel_gt_types.h | 3 ++
drivers/gpu/drm/i915/gt/uc/intel_guc.h | 3 +-
.../gpu/drm/i915/gt/uc/intel_guc_submission.c | 14 +++++---
drivers/gpu/drm/i915/intel_wakeref.c | 5 +++
drivers/gpu/drm/i915/intel_wakeref.h | 1 +
9 files changed, 99 insertions(+), 5 deletions(-)
create mode 100644 drivers/gpu/drm/i915/gt/intel_gt_pm_unpark_work.c
create mode 100644 drivers/gpu/drm/i915/gt/intel_gt_pm_unpark_work.h
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index a64aa43f7cd9..405558c08d6c 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -29,6 +29,9 @@ void intel_gt_init_early(struct intel_gt *gt, struct drm_i915_private *i915)
spin_lock_init(>->irq_lock);
+ spin_lock_init(>->pm_unpark_work_lock);
+ INIT_LIST_HEAD(>->pm_unpark_work_list);
+
INIT_LIST_HEAD(>->closed_vma);
spin_lock_init(>->closed_lock);
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
index dea8e2479897..564c11a3748b 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
@@ -90,6 +90,13 @@ static int __gt_unpark(struct intel_wakeref *wf)
return 0;
}
+static void __gt_unpark_work_queue(struct intel_wakeref *wf)
+{
+ struct intel_gt *gt = container_of(wf, typeof(*gt), wakeref);
+
+ intel_gt_pm_unpark_work_queue(gt);
+}
+
static int __gt_park(struct intel_wakeref *wf)
{
struct intel_gt *gt = container_of(wf, typeof(*gt), wakeref);
@@ -118,6 +125,7 @@ static int __gt_park(struct intel_wakeref *wf)
static const struct intel_wakeref_ops wf_ops = {
.get = __gt_unpark,
+ .post_get = __gt_unpark_work_queue,
.put = __gt_park,
};
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm_unpark_work.c b/drivers/gpu/drm/i915/gt/intel_gt_pm_unpark_work.c
new file mode 100644
index 000000000000..23162dbd0c35
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm_unpark_work.c
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2021 Intel Corporation
+ */
+
+#include "i915_drv.h"
+#include "intel_runtime_pm.h"
+#include "intel_gt_pm.h"
+
+void intel_gt_pm_unpark_work_queue(struct intel_gt *gt)
+{
+ struct intel_gt_pm_unpark_work *work, *next;
+ unsigned long flags;
+
+ spin_lock_irqsave(>->pm_unpark_work_lock, flags);
+ list_for_each_entry_safe(work, next,
+ >->pm_unpark_work_list, link) {
+ list_del_init(&work->link);
+ queue_work(system_unbound_wq, &work->worker);
+ }
+ spin_unlock_irqrestore(>->pm_unpark_work_lock, flags);
+}
+
+void intel_gt_pm_unpark_work_add(struct intel_gt *gt,
+ struct intel_gt_pm_unpark_work *work)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(>->pm_unpark_work_lock, flags);
+ if (intel_gt_pm_is_awake(gt))
+ queue_work(system_unbound_wq, &work->worker);
+ else if (list_empty(&work->link))
+ list_add_tail(&work->link, >->pm_unpark_work_list);
+ spin_unlock_irqrestore(>->pm_unpark_work_lock, flags);
+}
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm_unpark_work.h b/drivers/gpu/drm/i915/gt/intel_gt_pm_unpark_work.h
new file mode 100644
index 000000000000..08e9011be023
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm_unpark_work.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2021 Intel Corporation
+ */
+
+#ifndef INTEL_GT_PM_UNPARK_WORK_H
+#define INTEL_GT_PM_UNPARK_WORK_H
+
+#include <linux/list.h>
+#include <linux/workqueue.h>
+
+struct intel_gt;
+
+struct intel_gt_pm_unpark_work {
+ struct list_head link;
+ struct work_struct worker;
+};
+
+void intel_gt_pm_unpark_work_queue(struct intel_gt *gt);
+
+void intel_gt_pm_unpark_work_add(struct intel_gt *gt,
+ struct intel_gt_pm_unpark_work *work);
+
+static inline void
+intel_gt_pm_unpark_work_init(struct intel_gt_pm_unpark_work *work,
+ work_func_t fn)
+{
+ INIT_LIST_HEAD(&work->link);
+ INIT_WORK(&work->worker, fn);
+}
+
+#endif /* INTEL_GT_PM_UNPARK_WORK_H */
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_types.h b/drivers/gpu/drm/i915/gt/intel_gt_types.h
index 97a5075288d2..8d8a946561fa 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h
@@ -91,6 +91,9 @@ struct intel_gt {
struct intel_wakeref wakeref;
atomic_t user_wakeref;
+ struct list_head pm_unpark_work_list;
+ spinlock_t pm_unpark_work_lock; /* protect list */
+
struct list_head closed_vma;
spinlock_t closed_lock; /* guards the list of closed_vma */
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index 72fdfa1f6ccd..aedd5a4281b8 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
@@ -18,6 +18,7 @@
#include "intel_uc_fw.h"
#include "i915_utils.h"
#include "i915_vma.h"
+#include "gt/intel_gt_pm_unpark_work.h"
struct __guc_ads_blob;
@@ -63,7 +64,7 @@ struct intel_guc {
spinlock_t destroy_lock; /* protects list / worker */
struct list_head destroyed_contexts;
- struct work_struct destroy_worker;
+ struct intel_gt_pm_unpark_work destroy_worker;
bool submission_supported;
bool submission_selected;
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index 262fa77b56e2..7fe4d1559a81 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1406,8 +1406,9 @@ int intel_guc_submission_init(struct intel_guc *guc)
ida_init(&guc->guc_ids);
spin_lock_init(&guc->destroy_lock);
+
INIT_LIST_HEAD(&guc->destroyed_contexts);
- INIT_WORK(&guc->destroy_worker, destroy_worker_func);
+ intel_gt_pm_unpark_work_init(&guc->destroy_worker, destroy_worker_func);
return 0;
}
@@ -2446,13 +2447,18 @@ static void deregister_destroyed_contexts(struct intel_guc *guc)
static void destroy_worker_func(struct work_struct *w)
{
+ struct intel_gt_pm_unpark_work *destroy_worker =
+ container_of(w, struct intel_gt_pm_unpark_work, worker);
struct intel_guc *guc =
- container_of(w, struct intel_guc, destroy_worker);
+ container_of(destroy_worker, struct intel_guc, destroy_worker);
struct intel_gt *gt = guc_to_gt(guc);
int tmp;
- with_intel_gt_pm(gt, tmp)
+ with_intel_gt_pm_if_awake(gt, tmp)
deregister_destroyed_contexts(guc);
+
+ if (!list_empty(&guc->destroyed_contexts))
+ intel_gt_pm_unpark_work_add(gt, destroy_worker);
}
static void guc_context_destroy(struct kref *kref)
@@ -2515,7 +2521,7 @@ static void guc_context_destroy(struct kref *kref)
* take the GT PM for the first time which isn't allowed from an atomic
* context.
*/
- queue_work(system_unbound_wq, &guc->destroy_worker);
+ intel_gt_pm_unpark_work_add(guc_to_gt(guc), &guc->destroy_worker);
}
static int guc_context_alloc(struct intel_context *ce)
diff --git a/drivers/gpu/drm/i915/intel_wakeref.c b/drivers/gpu/drm/i915/intel_wakeref.c
index dfd87d082218..282fc4f312e3 100644
--- a/drivers/gpu/drm/i915/intel_wakeref.c
+++ b/drivers/gpu/drm/i915/intel_wakeref.c
@@ -24,6 +24,8 @@ static void rpm_put(struct intel_wakeref *wf)
int __intel_wakeref_get_first(struct intel_wakeref *wf)
{
+ bool do_post = false;
+
/*
* Treat get/put as different subclasses, as we may need to run
* the put callback from under the shrinker and do not want to
@@ -44,8 +46,11 @@ int __intel_wakeref_get_first(struct intel_wakeref *wf)
}
smp_mb__before_atomic(); /* release wf->count */
+ do_post = true;
}
atomic_inc(&wf->count);
+ if (do_post && wf->ops->post_get)
+ wf->ops->post_get(wf);
mutex_unlock(&wf->mutex);
INTEL_WAKEREF_BUG_ON(atomic_read(&wf->count) <= 0);
diff --git a/drivers/gpu/drm/i915/intel_wakeref.h b/drivers/gpu/drm/i915/intel_wakeref.h
index 545c8f277c46..ef7e6a698e8a 100644
--- a/drivers/gpu/drm/i915/intel_wakeref.h
+++ b/drivers/gpu/drm/i915/intel_wakeref.h
@@ -30,6 +30,7 @@ typedef depot_stack_handle_t intel_wakeref_t;
struct intel_wakeref_ops {
int (*get)(struct intel_wakeref *wf);
+ void (*post_get)(struct intel_wakeref *wf);
int (*put)(struct intel_wakeref *wf);
};
--
2.28.0
