From nobody Mon Feb 9 17:35:10 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B7D5349219D; Wed, 21 Jan 2026 13:00:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769000405; cv=none; b=mJ7mNPvtR2KuJ4lWEdCKOm566euP9/SzC9eh3/yQ49kFrWyzA+Vrx+xliCQZqmhrNbjDjtIKHQz7n4FmqgUvSWzAjcPLGtYzkNPwzifk9sz4Lz1hJacm/sqqKJuO2C/DTVRqu4TTMzFnnA3leYXN3yDZlDGdhABKcA2P/z2SaJ4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769000405; c=relaxed/simple; bh=tkBWbuPcCcp/u7j2SLPWnxsR4yn6Id6uZvGXefafQVg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Y06dINdi0ZZvOGfsKjLCCphrqnZ6Ub1amL3OSbVjogyWrraW/nVk0xBigkKsEIbeh5GBovKAHnh0et2suzAY8moRYH+M4k5Med3Lu5qu4hB7F3jyvotMJ8IPifOU1/KUCe+P2VJ/ITOoE/5r4ieywhzuiI2fSrkK8BsbG0ntf0w= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XiD5Mw8d; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XiD5Mw8d" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EE989C116D0; Wed, 21 Jan 2026 13:00:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769000405; bh=tkBWbuPcCcp/u7j2SLPWnxsR4yn6Id6uZvGXefafQVg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XiD5Mw8d/xml0FH5gdmZRlHA4aqR6JveYCrrTDcuzyZ8kXqorfmqTk0E2cd2aFlBt IlyaERqz/4+Csnj0W4X3sPWUI0vbrjrgEL0V0anU1ZWHg3tzvQ51QR6kUlpeWNHigz /6RxVyfBlfEh48rUkNs9u4d+7M8ZsMYk4KBuyFSmmNeFgcNiBYRQFbz4vz8RuQrqKY auHzS5OkYP2LlC6XzGHo2c9H1BmRrxt6eMjDollxj61ne6mII8UwDp3yRoV+SqJ9s8 rxCQH4EJGsUoAN6qzjYdeDerw+95p8+z+ILF5ZfB9wY+I1YInEeUO4Awvob9xoaXY2 4zfXVFobpIydg== From: Leon Romanovsky To: Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= , Alex Deucher , David Airlie , Simona Vetter , Gerd Hoffmann , Dmitry Osipenko , Gurchetan Singh , Chia-I Wu , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Lucas De Marchi , =?utf-8?q?Thomas_Hellstr=C3=B6m?= , Rodrigo Vivi , Jason Gunthorpe , Leon Romanovsky , Kevin Tian , Joerg Roedel , Will Deacon , Robin Murphy , Felix Kuehling , Alex Williamson , Ankit Agrawal , Vivek Kasireddy Cc: linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, virtualization@lists.linux.dev, intel-xe@lists.freedesktop.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, kvm@vger.kernel.org Subject: [PATCH v4 7/8] vfio: Wait for dma-buf invalidation to complete Date: Wed, 21 Jan 2026 14:59:15 +0200 Message-ID: <20260121-dmabuf-revoke-v4-7-d311cbc8633d@nvidia.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260121-dmabuf-revoke-v4-0-d311cbc8633d@nvidia.com> References: <20260121-dmabuf-revoke-v4-0-d311cbc8633d@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" X-Mailer: b4 0.15-dev-a6db3 Content-Transfer-Encoding: quoted-printable From: Leon Romanovsky dma-buf invalidation is performed asynchronously by hardware, so VFIO must wait until all affected objects have been fully invalidated. Fixes: 5d74781ebc86 ("vfio/pci: Add dma-buf export support for MMIO regions= ") Signed-off-by: Leon Romanovsky --- drivers/vfio/pci/vfio_pci_dmabuf.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/vfio/pci/vfio_pci_dmabuf.c b/drivers/vfio/pci/vfio_pci= _dmabuf.c index 362e3d149817..5fceefc40e27 100644 --- a/drivers/vfio/pci/vfio_pci_dmabuf.c +++ b/drivers/vfio/pci/vfio_pci_dmabuf.c @@ -321,6 +321,9 @@ void vfio_pci_dma_buf_move(struct vfio_pci_core_device = *vdev, bool revoked) dma_resv_lock(priv->dmabuf->resv, NULL); priv->revoked =3D revoked; dma_buf_invalidate_mappings(priv->dmabuf); + dma_resv_wait_timeout(priv->dmabuf->resv, + DMA_RESV_USAGE_BOOKKEEP, false, + MAX_SCHEDULE_TIMEOUT); dma_resv_unlock(priv->dmabuf->resv); } fput(priv->dmabuf->file); @@ -342,6 +345,9 @@ void vfio_pci_dma_buf_cleanup(struct vfio_pci_core_devi= ce *vdev) priv->vdev =3D NULL; priv->revoked =3D true; dma_buf_invalidate_mappings(priv->dmabuf); + dma_resv_wait_timeout(priv->dmabuf->resv, + DMA_RESV_USAGE_BOOKKEEP, false, + MAX_SCHEDULE_TIMEOUT); dma_resv_unlock(priv->dmabuf->resv); vfio_device_put_registration(&vdev->vdev); fput(priv->dmabuf->file); --=20 2.52.0