[PATCH v5 0/6] drm/qxl: fix driver shutdown issues.

[PATCH v5 0/6] drm/qxl: fix driver shutdown issues.

[Gerd Hoffmann]

Almost there.  Still getting this on driver unbind:

   kobject: '(null)' ((____ptrval____)): is not initialized, yet kobject_put(=
) is being called
   [ ... ]
   Call Trace:
    ttm_device_fini+0x133/0x1b0 [ttm]
    qxl_ttm_fini+0x2f/0x40 [qxl]
    qxl_device_fini+0x88/0x120 [qxl]
    drm_minor_release+0x3d/0x60

but I don't think this is the qxl driver's fault.

v5:
 - add release_event wait queue.
 - also cleanup qxl_fence_wait().

Gerd Hoffmann (6):
  drm/qxl: use drmm_mode_config_init
  drm/qxl: unpin release objects
  drm/qxl: release shadow on shutdown
  drm/qxl: handle shadow in primary destroy
  drm/qxl: properly free qxl releases
  drm/qxl: simplify qxl_fence_wait

 drivers/gpu/drm/qxl/qxl_drv.h     |  2 ++
 drivers/gpu/drm/qxl/qxl_cmd.c     |  1 +
 drivers/gpu/drm/qxl/qxl_display.c | 11 ++++++--
 drivers/gpu/drm/qxl/qxl_irq.c     |  1 +
 drivers/gpu/drm/qxl/qxl_kms.c     | 22 +++++++++++++--
 drivers/gpu/drm/qxl/qxl_release.c | 45 +++++--------------------------
 6 files changed, 40 insertions(+), 42 deletions(-)

--=20
2.29.2


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[PATCH v5 1/6] drm/qxl: use drmm_mode_config_init

[Gerd Hoffmann]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/qxl/qxl_display.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index 012bce0cdb65..38d6b596094d 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -1195,7 +1195,9 @@ int qxl_modeset_init(struct qxl_device *qdev)
 	int i;
 	int ret;
 
-	drm_mode_config_init(&qdev->ddev);
+	ret = drmm_mode_config_init(&qdev->ddev);
+	if (ret)
+		return ret;
 
 	ret = qxl_create_monitors_object(qdev);
 	if (ret)
@@ -1228,5 +1230,4 @@ int qxl_modeset_init(struct qxl_device *qdev)
 void qxl_modeset_fini(struct qxl_device *qdev)
 {
 	qxl_destroy_monitors_object(qdev);
-	drm_mode_config_cleanup(&qdev->ddev);
 }
-- 
2.29.2

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[PATCH v5 2/6] drm/qxl: unpin release objects

[Gerd Hoffmann]

Balances the qxl_create_bo(..., pinned=true, ...);
call in qxl_release_bo_alloc().

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/qxl/qxl_release.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
index c52412724c26..28013fd1f8ea 100644
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -347,6 +347,7 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
 
 	mutex_lock(&qdev->release_mutex);
 	if (qdev->current_release_bo_offset[cur_idx] + 1 >= releases_per_bo[cur_idx]) {
+		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;
-- 
2.29.2

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Re: [PATCH v5 2/6] drm/qxl: unpin release objects

[Thomas Zimmermann]

[-- Attachment #1.1.1: Type: text/plain, Size: 1205 bytes --]



Am 03.02.21 um 14:16 schrieb Gerd Hoffmann:
> Balances the qxl_create_bo(..., pinned=true, ...);
> call in qxl_release_bo_alloc().
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>

> ---
>   drivers/gpu/drm/qxl/qxl_release.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
> index c52412724c26..28013fd1f8ea 100644
> --- a/drivers/gpu/drm/qxl/qxl_release.c
> +++ b/drivers/gpu/drm/qxl/qxl_release.c
> @@ -347,6 +347,7 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
>   
>   	mutex_lock(&qdev->release_mutex);
>   	if (qdev->current_release_bo_offset[cur_idx] + 1 >= releases_per_bo[cur_idx]) {
> +		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;
> 

-- 
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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[PATCH v5 3/6] drm/qxl: release shadow on shutdown

[Gerd Hoffmann]

In case we have a shadow surface on shutdown release
it so it doesn't leak.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/qxl/qxl_display.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index 38d6b596094d..60331e31861a 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -1229,5 +1229,9 @@ int qxl_modeset_init(struct qxl_device *qdev)
 
 void qxl_modeset_fini(struct qxl_device *qdev)
 {
+	if (qdev->dumb_shadow_bo) {
+		drm_gem_object_put(&qdev->dumb_shadow_bo->tbo.base);
+		qdev->dumb_shadow_bo = NULL;
+	}
 	qxl_destroy_monitors_object(qdev);
 }
-- 
2.29.2

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Re: [PATCH v5 3/6] drm/qxl: release shadow on shutdown

[Thomas Zimmermann]

[-- Attachment #1.1.1: Type: text/plain, Size: 1225 bytes --]

Hi

Am 03.02.21 um 14:16 schrieb Gerd Hoffmann:
> In case we have a shadow surface on shutdown release
> it so it doesn't leak.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>   drivers/gpu/drm/qxl/qxl_display.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
> index 38d6b596094d..60331e31861a 100644
> --- a/drivers/gpu/drm/qxl/qxl_display.c
> +++ b/drivers/gpu/drm/qxl/qxl_display.c
> @@ -1229,5 +1229,9 @@ int qxl_modeset_init(struct qxl_device *qdev)
>   
>   void qxl_modeset_fini(struct qxl_device *qdev)
>   {
> +	if (qdev->dumb_shadow_bo) {
> +		drm_gem_object_put(&qdev->dumb_shadow_bo->tbo.base);
> +		qdev->dumb_shadow_bo = NULL;
> +	}

In qxl_plane_prepare_fb(), qdev->dumb_shadow_bo is being created as 
pinned object. Wouldn't it have to be unpinned here and during the 
release in qxl_plane_prepare_fb()?

Best regards
Thomas

>   	qxl_destroy_monitors_object(qdev);
>   }
> 

-- 
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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[PATCH v5 4/6] drm/qxl: handle shadow in primary destroy

[Gerd Hoffmann]

qxl_primary_atomic_disable must check whenever the framebuffer bo has a
shadow surface and in case it has check the shadow primary status.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/qxl/qxl_display.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index 60331e31861a..f5ee8cd72b5b 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -562,6 +562,8 @@ static void qxl_primary_atomic_disable(struct drm_plane *plane,
 	if (old_state->fb) {
 		struct qxl_bo *bo = gem_to_qxl_bo(old_state->fb->obj[0]);
 
+		if (bo->shadow)
+			bo = bo->shadow;
 		if (bo->is_primary) {
 			qxl_io_destroy_primary(qdev);
 			bo->is_primary = false;
-- 
2.29.2

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Re: [PATCH v5 4/6] drm/qxl: handle shadow in primary destroy

[Thomas Zimmermann]

[-- Attachment #1.1.1: Type: text/plain, Size: 1168 bytes --]



Am 03.02.21 um 14:16 schrieb Gerd Hoffmann:
> qxl_primary_atomic_disable must check whenever the framebuffer bo has a
> shadow surface and in case it has check the shadow primary status.

I believe you :)

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>

> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>   drivers/gpu/drm/qxl/qxl_display.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
> index 60331e31861a..f5ee8cd72b5b 100644
> --- a/drivers/gpu/drm/qxl/qxl_display.c
> +++ b/drivers/gpu/drm/qxl/qxl_display.c
> @@ -562,6 +562,8 @@ static void qxl_primary_atomic_disable(struct drm_plane *plane,
>   	if (old_state->fb) {
>   		struct qxl_bo *bo = gem_to_qxl_bo(old_state->fb->obj[0]);
>   
> +		if (bo->shadow)
> +			bo = bo->shadow;
>   		if (bo->is_primary) {
>   			qxl_io_destroy_primary(qdev);
>   			bo->is_primary = false;
> 

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

[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@redhat.com>
---
 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]) {
-- 
2.29.2

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

[Thomas Zimmermann]

[-- Attachment #1.1.1: Type: text/plain, Size: 4332 bytes --]



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@redhat.com>

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>

> ---
>   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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[PATCH v5 6/6] drm/qxl: simplify qxl_fence_wait

[Gerd Hoffmann]

Now that we have the new release_event wait queue we can just
use that in qxl_fence_wait() and simplify the code alot.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/qxl/qxl_release.c | 42 +++----------------------------
 1 file changed, 4 insertions(+), 38 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
index 43a5436853b7..b6f4b8dcf228 100644
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -59,53 +59,19 @@ static long qxl_fence_wait(struct dma_fence *fence, bool intr,
 {
 	struct qxl_device *qdev;
 	struct qxl_release *release;
-	int count = 0, sc = 0;
-	bool have_drawable_releases;
 	unsigned long cur, end = jiffies + timeout;
 
 	qdev = container_of(fence->lock, struct qxl_device, release_lock);
 	release = container_of(fence, struct qxl_release, base);
-	have_drawable_releases = release->type == QXL_RELEASE_DRAWABLE;
-
-retry:
-	sc++;
 
 	if (dma_fence_is_signaled(fence))
 		goto signaled;
 
 	qxl_io_notify_oom(qdev);
-
-	for (count = 0; count < 11; count++) {
-		if (!qxl_queue_garbage_collect(qdev, true))
-			break;
-
-		if (dma_fence_is_signaled(fence))
-			goto signaled;
-	}
-
-	if (dma_fence_is_signaled(fence))
-		goto signaled;
-
-	if (have_drawable_releases || sc < 4) {
-		if (sc > 2)
-			/* back off */
-			usleep_range(500, 1000);
-
-		if (time_after(jiffies, end))
-			return 0;
-
-		if (have_drawable_releases && sc > 300) {
-			DMA_FENCE_WARN(fence, "failed to wait on release %llu "
-				       "after spincount %d\n",
-				       fence->context & ~0xf0000000, sc);
-			goto signaled;
-		}
-		goto retry;
-	}
-	/*
-	 * yeah, original sync_obj_wait gave up after 3 spins when
-	 * have_drawable_releases is not set.
-	 */
+	if (!wait_event_timeout(qdev->release_event,
+				dma_fence_is_signaled(fence),
+				timeout))
+		return 0;
 
 signaled:
 	cur = jiffies;
-- 
2.29.2

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Re: [PATCH v5 6/6] drm/qxl: simplify qxl_fence_wait

[Thomas Zimmermann]

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Am 03.02.21 um 14:16 schrieb Gerd Hoffmann:
> Now that we have the new release_event wait queue we can just
> use that in qxl_fence_wait() and simplify the code alot.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>

> ---
>   drivers/gpu/drm/qxl/qxl_release.c | 42 +++----------------------------
>   1 file changed, 4 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
> index 43a5436853b7..b6f4b8dcf228 100644
> --- a/drivers/gpu/drm/qxl/qxl_release.c
> +++ b/drivers/gpu/drm/qxl/qxl_release.c
> @@ -59,53 +59,19 @@ static long qxl_fence_wait(struct dma_fence *fence, bool intr,
>   {
>   	struct qxl_device *qdev;
>   	struct qxl_release *release;
> -	int count = 0, sc = 0;
> -	bool have_drawable_releases;
>   	unsigned long cur, end = jiffies + timeout;
>   
>   	qdev = container_of(fence->lock, struct qxl_device, release_lock);
>   	release = container_of(fence, struct qxl_release, base);
> -	have_drawable_releases = release->type == QXL_RELEASE_DRAWABLE;
> -
> -retry:
> -	sc++;
>   
>   	if (dma_fence_is_signaled(fence))
>   		goto signaled;
>   
>   	qxl_io_notify_oom(qdev);
> -
> -	for (count = 0; count < 11; count++) {
> -		if (!qxl_queue_garbage_collect(qdev, true))
> -			break;
> -
> -		if (dma_fence_is_signaled(fence))
> -			goto signaled;
> -	}
> -
> -	if (dma_fence_is_signaled(fence))
> -		goto signaled;
> -
> -	if (have_drawable_releases || sc < 4) {
> -		if (sc > 2)
> -			/* back off */
> -			usleep_range(500, 1000);
> -
> -		if (time_after(jiffies, end))
> -			return 0;
> -
> -		if (have_drawable_releases && sc > 300) {
> -			DMA_FENCE_WARN(fence, "failed to wait on release %llu "
> -				       "after spincount %d\n",
> -				       fence->context & ~0xf0000000, sc);
> -			goto signaled;
> -		}
> -		goto retry;
> -	}
> -	/*
> -	 * yeah, original sync_obj_wait gave up after 3 spins when
> -	 * have_drawable_releases is not set.
> -	 */
> +	if (!wait_event_timeout(qdev->release_event,
> +				dma_fence_is_signaled(fence),
> +				timeout))
> +		return 0;
>   
>   signaled:
>   	cur = jiffies;
> 

-- 
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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Re: [PATCH v5 6/6] drm/qxl: simplify qxl_fence_wait

[kernel test robot]

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Hi Gerd,

I love your patch! Perhaps something to improve:

[auto build test WARNING on drm-intel/for-linux-next]
[also build test WARNING on drm-tip/drm-tip drm-exynos/exynos-drm-next tegra-drm/drm/tegra/for-next linus/master v5.11-rc6 next-20210125]
[cannot apply to drm/drm-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Gerd-Hoffmann/drm-qxl-fix-driver-shutdown-issues/20210203-211739
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: i386-randconfig-a013-20210202 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/0b11c8d52de8c79900ab632aa3527f19c442efc6
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Gerd-Hoffmann/drm-qxl-fix-driver-shutdown-issues/20210203-211739
        git checkout 0b11c8d52de8c79900ab632aa3527f19c442efc6
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/qxl/qxl_release.c: In function 'qxl_fence_wait':
>> drivers/gpu/drm/qxl/qxl_release.c:61:22: warning: variable 'release' set but not used [-Wunused-but-set-variable]
      61 |  struct qxl_release *release;
         |                      ^~~~~~~


vim +/release +61 drivers/gpu/drm/qxl/qxl_release.c

2f453ed4038526 Maarten Lankhorst 2014-04-02  56  
f54d1867005c33 Chris Wilson      2016-10-25  57  static long qxl_fence_wait(struct dma_fence *fence, bool intr,
f54d1867005c33 Chris Wilson      2016-10-25  58  			   signed long timeout)
2f453ed4038526 Maarten Lankhorst 2014-04-02  59  {
2f453ed4038526 Maarten Lankhorst 2014-04-02  60  	struct qxl_device *qdev;
2f453ed4038526 Maarten Lankhorst 2014-04-02 @61  	struct qxl_release *release;
2f453ed4038526 Maarten Lankhorst 2014-04-02  62  	unsigned long cur, end = jiffies + timeout;
2f453ed4038526 Maarten Lankhorst 2014-04-02  63  
2f453ed4038526 Maarten Lankhorst 2014-04-02  64  	qdev = container_of(fence->lock, struct qxl_device, release_lock);
2f453ed4038526 Maarten Lankhorst 2014-04-02  65  	release = container_of(fence, struct qxl_release, base);
2f453ed4038526 Maarten Lankhorst 2014-04-02  66  
f54d1867005c33 Chris Wilson      2016-10-25  67  	if (dma_fence_is_signaled(fence))
2f453ed4038526 Maarten Lankhorst 2014-04-02  68  		goto signaled;
2f453ed4038526 Maarten Lankhorst 2014-04-02  69  
2f453ed4038526 Maarten Lankhorst 2014-04-02  70  	qxl_io_notify_oom(qdev);
0b11c8d52de8c7 Gerd Hoffmann     2021-02-03  71  	if (!wait_event_timeout(qdev->release_event,
0b11c8d52de8c7 Gerd Hoffmann     2021-02-03  72  				dma_fence_is_signaled(fence),
0b11c8d52de8c7 Gerd Hoffmann     2021-02-03  73  				timeout))
2f453ed4038526 Maarten Lankhorst 2014-04-02  74  		return 0;
2f453ed4038526 Maarten Lankhorst 2014-04-02  75  
2f453ed4038526 Maarten Lankhorst 2014-04-02  76  signaled:
2f453ed4038526 Maarten Lankhorst 2014-04-02  77  	cur = jiffies;
2f453ed4038526 Maarten Lankhorst 2014-04-02  78  	if (time_after(cur, end))
2f453ed4038526 Maarten Lankhorst 2014-04-02  79  		return 0;
2f453ed4038526 Maarten Lankhorst 2014-04-02  80  	return end - cur;
2f453ed4038526 Maarten Lankhorst 2014-04-02  81  }
2f453ed4038526 Maarten Lankhorst 2014-04-02  82  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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