Re: [PATCH v5 5/6] drm/qxl: properly free qxl releases

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Am 03.02.21 um 14:16 schrieb Gerd Hoffmann:
Reorganize qxl_device_fini() a bit.
Add missing unpin() calls.

Count releases.  Add wait queue for releases.  That way
qxl_device_fini() can easily wait until everything is
ready for proper shutdown.

Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>

Acked-by: Thomas Zimmermann <tzimmermann@xxxxxxx>

---
  drivers/gpu/drm/qxl/qxl_drv.h     |  2 ++
  drivers/gpu/drm/qxl/qxl_cmd.c     |  1 +
  drivers/gpu/drm/qxl/qxl_irq.c     |  1 +
  drivers/gpu/drm/qxl/qxl_kms.c     | 22 ++++++++++++++++++++--
  drivers/gpu/drm/qxl/qxl_release.c |  2 ++
  5 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_drv.h b/drivers/gpu/drm/qxl/qxl_drv.h
index 01354b43c413..6dd57cfb2e7c 100644
--- a/drivers/gpu/drm/qxl/qxl_drv.h
+++ b/drivers/gpu/drm/qxl/qxl_drv.h
@@ -214,6 +214,8 @@ struct qxl_device {
  	spinlock_t	release_lock;
  	struct idr	release_idr;
  	uint32_t	release_seqno;
+	atomic_t	release_count;
+	wait_queue_head_t release_event;
  	spinlock_t release_idr_lock;
  	struct mutex	async_io_mutex;
  	unsigned int last_sent_io_cmd;
diff --git a/drivers/gpu/drm/qxl/qxl_cmd.c b/drivers/gpu/drm/qxl/qxl_cmd.c
index 54e3c3a97440..7e22a81bfb36 100644
--- a/drivers/gpu/drm/qxl/qxl_cmd.c
+++ b/drivers/gpu/drm/qxl/qxl_cmd.c
@@ -254,6 +254,7 @@ int qxl_garbage_collect(struct qxl_device *qdev)
  		}
  	}
+ wake_up_all(&qdev->release_event);
  	DRM_DEBUG_DRIVER("%d\n", i);
return i;
diff --git a/drivers/gpu/drm/qxl/qxl_irq.c b/drivers/gpu/drm/qxl/qxl_irq.c
index ddf6588a2a38..d312322cacd1 100644
--- a/drivers/gpu/drm/qxl/qxl_irq.c
+++ b/drivers/gpu/drm/qxl/qxl_irq.c
@@ -87,6 +87,7 @@ int qxl_irq_init(struct qxl_device *qdev)
  	init_waitqueue_head(&qdev->display_event);
  	init_waitqueue_head(&qdev->cursor_event);
  	init_waitqueue_head(&qdev->io_cmd_event);
+	init_waitqueue_head(&qdev->release_event);
  	INIT_WORK(&qdev->client_monitors_config_work,
  		  qxl_client_monitors_config_work_func);
  	atomic_set(&qdev->irq_received, 0);
diff --git a/drivers/gpu/drm/qxl/qxl_kms.c b/drivers/gpu/drm/qxl/qxl_kms.c
index 4a60a52ab62e..616aea948863 100644
--- a/drivers/gpu/drm/qxl/qxl_kms.c
+++ b/drivers/gpu/drm/qxl/qxl_kms.c
@@ -286,8 +286,26 @@ int qxl_device_init(struct qxl_device *qdev,
void qxl_device_fini(struct qxl_device *qdev)
  {
-	qxl_bo_unref(&qdev->current_release_bo[0]);
-	qxl_bo_unref(&qdev->current_release_bo[1]);
+	int cur_idx;
+
+	for (cur_idx = 0; cur_idx < 3; cur_idx++) {
+		if (!qdev->current_release_bo[cur_idx])
+			continue;
+		qxl_bo_unpin(qdev->current_release_bo[cur_idx]);
+		qxl_bo_unref(&qdev->current_release_bo[cur_idx]);
+		qdev->current_release_bo_offset[cur_idx] = 0;
+		qdev->current_release_bo[cur_idx] = NULL;
+	}
+
+	/*
+	 * Ask host to release resources (+fill release ring),
+	 * then wait for the release actually happening.
+	 */
+	qxl_io_notify_oom(qdev);
+	wait_event_timeout(qdev->release_event,
+			   atomic_read(&qdev->release_count) == 0,
+			   HZ);
+
  	qxl_gem_fini(qdev);
  	qxl_bo_fini(qdev);
  	flush_work(&qdev->gc_work);
diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
index 28013fd1f8ea..43a5436853b7 100644
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -196,6 +196,7 @@ qxl_release_free(struct qxl_device *qdev,
  		qxl_release_free_list(release);
  		kfree(release);
  	}
+	atomic_dec(&qdev->release_count);
  }
static int qxl_release_bo_alloc(struct qxl_device *qdev,
@@ -344,6 +345,7 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
  			*rbo = NULL;
  		return idr_ret;
  	}
+	atomic_inc(&qdev->release_count);
mutex_lock(&qdev->release_mutex);
  	if (qdev->current_release_bo_offset[cur_idx] + 1 >= releases_per_bo[cur_idx]) {


--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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