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From: Gerd Hoffmann <kraxel@redhat.com>
To: dri-devel@lists.freedesktop.org
Cc: Gerd Hoffmann <kraxel@redhat.com>,
	Dave Airlie <airlied@redhat.com>, David Airlie <airlied@linux.ie>,
	Daniel Vetter <daniel@ffwll.ch>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	virtualization@lists.linux-foundation.org (open list:DRM DRIVER
	FOR QXL VIRTUAL GPU),
	spice-devel@lists.freedesktop.org (open list:DRM DRIVER FOR QXL
	VIRTUAL GPU), linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v2 04/11] drm/qxl: fix lockdep issue in qxl_alloc_release_reserved
Date: Wed, 17 Feb 2021 13:32:06 +0100	[thread overview]
Message-ID: <20210217123213.2199186-5-kraxel@redhat.com> (raw)
In-Reply-To: <20210217123213.2199186-1-kraxel@redhat.com>

Call qxl_bo_unpin (which does a reservation) without holding the
release_mutex lock.  Fixes lockdep (correctly) warning on a possible
deadlock.

Fixes: 65ffea3c6e73 ("drm/qxl: unpin release objects")
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/qxl/qxl_release.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
index 716d706ca7f0..f5845c96d414 100644
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -283,7 +283,7 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
 				       int type, struct qxl_release **release,
 				       struct qxl_bo **rbo)
 {
-	struct qxl_bo *bo;
+	struct qxl_bo *bo, *free_bo = NULL;
 	int idr_ret;
 	int ret = 0;
 	union qxl_release_info *info;
@@ -315,8 +315,7 @@ 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]);
+		free_bo = qdev->current_release_bo[cur_idx];
 		qdev->current_release_bo_offset[cur_idx] = 0;
 		qdev->current_release_bo[cur_idx] = NULL;
 	}
@@ -324,6 +323,10 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
 		ret = qxl_release_bo_alloc(qdev, &qdev->current_release_bo[cur_idx], priority);
 		if (ret) {
 			mutex_unlock(&qdev->release_mutex);
+			if (free_bo) {
+				qxl_bo_unpin(free_bo);
+				qxl_bo_unref(&free_bo);
+			}
 			qxl_release_free(qdev, *release);
 			return ret;
 		}
@@ -339,6 +342,10 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
 		*rbo = bo;
 
 	mutex_unlock(&qdev->release_mutex);
+	if (free_bo) {
+		qxl_bo_unpin(free_bo);
+		qxl_bo_unref(&free_bo);
+	}
 
 	ret = qxl_release_list_add(*release, bo);
 	qxl_bo_unref(&bo);
-- 
2.29.2


WARNING: multiple messages have this Message-ID (diff)
From: Gerd Hoffmann <kraxel@redhat.com>
To: dri-devel@lists.freedesktop.org
Cc: Thomas Zimmermann <tzimmermann@suse.de>,
	David Airlie <airlied@linux.ie>,
	open list <linux-kernel@vger.kernel.org>,
	"open list:DRM DRIVER FOR QXL VIRTUAL GPU"
	<virtualization@lists.linux-foundation.org>,
	Daniel Vetter <daniel@ffwll.ch>,
	"open list:DRM DRIVER FOR QXL VIRTUAL GPU"
	<spice-devel@lists.freedesktop.org>,
	Dave Airlie <airlied@redhat.com>
Subject: [PATCH v2 04/11] drm/qxl: fix lockdep issue in qxl_alloc_release_reserved
Date: Wed, 17 Feb 2021 13:32:06 +0100	[thread overview]
Message-ID: <20210217123213.2199186-5-kraxel@redhat.com> (raw)
In-Reply-To: <20210217123213.2199186-1-kraxel@redhat.com>

Call qxl_bo_unpin (which does a reservation) without holding the
release_mutex lock.  Fixes lockdep (correctly) warning on a possible
deadlock.

Fixes: 65ffea3c6e73 ("drm/qxl: unpin release objects")
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/qxl/qxl_release.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
index 716d706ca7f0..f5845c96d414 100644
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -283,7 +283,7 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
 				       int type, struct qxl_release **release,
 				       struct qxl_bo **rbo)
 {
-	struct qxl_bo *bo;
+	struct qxl_bo *bo, *free_bo = NULL;
 	int idr_ret;
 	int ret = 0;
 	union qxl_release_info *info;
@@ -315,8 +315,7 @@ 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]);
+		free_bo = qdev->current_release_bo[cur_idx];
 		qdev->current_release_bo_offset[cur_idx] = 0;
 		qdev->current_release_bo[cur_idx] = NULL;
 	}
@@ -324,6 +323,10 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
 		ret = qxl_release_bo_alloc(qdev, &qdev->current_release_bo[cur_idx], priority);
 		if (ret) {
 			mutex_unlock(&qdev->release_mutex);
+			if (free_bo) {
+				qxl_bo_unpin(free_bo);
+				qxl_bo_unref(&free_bo);
+			}
 			qxl_release_free(qdev, *release);
 			return ret;
 		}
@@ -339,6 +342,10 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
 		*rbo = bo;
 
 	mutex_unlock(&qdev->release_mutex);
+	if (free_bo) {
+		qxl_bo_unpin(free_bo);
+		qxl_bo_unref(&free_bo);
+	}
 
 	ret = qxl_release_list_add(*release, bo);
 	qxl_bo_unref(&bo);
-- 
2.29.2

_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization

WARNING: multiple messages have this Message-ID (diff)
From: Gerd Hoffmann <kraxel@redhat.com>
To: dri-devel@lists.freedesktop.org
Cc: Thomas Zimmermann <tzimmermann@suse.de>,
	David Airlie <airlied@linux.ie>,
	open list <linux-kernel@vger.kernel.org>,
	"open list:DRM DRIVER FOR QXL VIRTUAL GPU"
	<virtualization@lists.linux-foundation.org>,
	Gerd Hoffmann <kraxel@redhat.com>,
	"open list:DRM DRIVER FOR QXL VIRTUAL GPU"
	<spice-devel@lists.freedesktop.org>,
	Dave Airlie <airlied@redhat.com>
Subject: [PATCH v2 04/11] drm/qxl: fix lockdep issue in qxl_alloc_release_reserved
Date: Wed, 17 Feb 2021 13:32:06 +0100	[thread overview]
Message-ID: <20210217123213.2199186-5-kraxel@redhat.com> (raw)
In-Reply-To: <20210217123213.2199186-1-kraxel@redhat.com>

Call qxl_bo_unpin (which does a reservation) without holding the
release_mutex lock.  Fixes lockdep (correctly) warning on a possible
deadlock.

Fixes: 65ffea3c6e73 ("drm/qxl: unpin release objects")
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/qxl/qxl_release.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
index 716d706ca7f0..f5845c96d414 100644
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -283,7 +283,7 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
 				       int type, struct qxl_release **release,
 				       struct qxl_bo **rbo)
 {
-	struct qxl_bo *bo;
+	struct qxl_bo *bo, *free_bo = NULL;
 	int idr_ret;
 	int ret = 0;
 	union qxl_release_info *info;
@@ -315,8 +315,7 @@ 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]);
+		free_bo = qdev->current_release_bo[cur_idx];
 		qdev->current_release_bo_offset[cur_idx] = 0;
 		qdev->current_release_bo[cur_idx] = NULL;
 	}
@@ -324,6 +323,10 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
 		ret = qxl_release_bo_alloc(qdev, &qdev->current_release_bo[cur_idx], priority);
 		if (ret) {
 			mutex_unlock(&qdev->release_mutex);
+			if (free_bo) {
+				qxl_bo_unpin(free_bo);
+				qxl_bo_unref(&free_bo);
+			}
 			qxl_release_free(qdev, *release);
 			return ret;
 		}
@@ -339,6 +342,10 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
 		*rbo = bo;
 
 	mutex_unlock(&qdev->release_mutex);
+	if (free_bo) {
+		qxl_bo_unpin(free_bo);
+		qxl_bo_unref(&free_bo);
+	}
 
 	ret = qxl_release_list_add(*release, bo);
 	qxl_bo_unref(&bo);
-- 
2.29.2

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

  parent reply	other threads:[~2021-02-17 12:34 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-17 12:32 [PATCH v2 00/11] drm/qxl: a collection of fixes Gerd Hoffmann
2021-02-17 12:32 ` [PATCH v2 01/11] drm/qxl: properly handle device init failures Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 12:32 ` [PATCH v2 02/11] drm/qxl: more fence wait rework Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 19:21   ` Thomas Zimmermann
2021-02-17 19:21     ` Thomas Zimmermann
2021-02-17 19:21     ` Thomas Zimmermann
2021-02-17 12:32 ` [PATCH v2 03/11] drm/qxl: use ttm bo priorities Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 19:22   ` Thomas Zimmermann
2021-02-17 19:22     ` Thomas Zimmermann
2021-02-17 19:22     ` Thomas Zimmermann
2021-02-17 12:32 ` Gerd Hoffmann [this message]
2021-02-17 12:32   ` [PATCH v2 04/11] drm/qxl: fix lockdep issue in qxl_alloc_release_reserved Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 19:23   ` Thomas Zimmermann
2021-02-17 19:23     ` Thomas Zimmermann
2021-02-17 19:23     ` Thomas Zimmermann
2021-02-17 12:32 ` [PATCH v2 05/11] drm/qxl: rename qxl_bo_kmap -> qxl_bo_vmap_locked Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 19:24   ` Thomas Zimmermann
2021-02-17 19:24     ` Thomas Zimmermann
2021-02-17 19:24     ` Thomas Zimmermann
2021-02-17 12:32 ` [PATCH v2 06/11] drm/qxl: add qxl_bo_vmap/qxl_bo_vunmap Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 19:24   ` Thomas Zimmermann
2021-02-17 19:24     ` Thomas Zimmermann
2021-02-17 19:24     ` Thomas Zimmermann
2021-02-17 12:32 ` [PATCH v2 07/11] drm/qxl: fix prime vmap Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 12:32 ` [PATCH v2 08/11] drm/qxl: fix monitors object vmap Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-18 14:42   ` Thomas Zimmermann
2021-02-18 14:42     ` Thomas Zimmermann
2021-02-18 14:42     ` Thomas Zimmermann
2021-02-17 12:32 ` [PATCH v2 09/11] drm/qxl: move shadow handling to new qxl_prepare_shadow() Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 12:32 ` [PATCH v2 10/11] drm/qxl: rework cursor plane Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-18  8:02   ` Thomas Zimmermann
2021-02-18  8:02     ` Thomas Zimmermann
2021-02-18  8:02     ` Thomas Zimmermann
2021-02-18 11:50     ` Gerd Hoffmann
2021-02-18 11:50       ` Gerd Hoffmann
2021-02-18 11:50       ` Gerd Hoffmann
2021-02-18 13:33       ` Thomas Zimmermann
2021-02-18 13:33         ` Thomas Zimmermann
2021-02-18 13:33         ` Thomas Zimmermann
2021-02-18 14:23         ` Gerd Hoffmann
2021-02-18 14:23           ` Gerd Hoffmann
2021-02-18 14:23           ` Gerd Hoffmann
2021-02-17 12:32 ` [PATCH v2 11/11] drm/qxl: add lock asserts to qxl_bo_vmap_locked + qxl_bo_vunmap_locked Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann
2021-02-17 12:32   ` Gerd Hoffmann

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