From patchwork Fri Feb 2 09:39:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 13542578 Received: from out30-110.freemail.mail.aliyun.com (out30-110.freemail.mail.aliyun.com [115.124.30.110]) (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 E71217F47A; Fri, 2 Feb 2024 09:40:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.110 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706866823; cv=none; b=n2mCb0TP9ixtl1uO/Tqh4flfW/cufGCU7bzZOImtET9bVe81vtf6IlozcmcaGmXD7SK0TTaACqH5YUhb6sU9d3SjsYw52J1vIoX5y2bB49L81iFMjGV2SO7/p81BIUwViDQSxfzBtjszq4p/MzbDFAPFgQj6laQEUEHq3ndcY3A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706866823; c=relaxed/simple; bh=yIXbIndQt6+2ebEHEiqbj+/NcuIz3+nVpOZjnSh8W7U=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=oVlXTox/4cOY9nVnup8bIzV9xeY9vKvQY5oDzjXwtL0pO/JwpMwe0g6TGeb7ZZDu1KkHNeY8g4hgkdbLwxKiBWirzVXGPVrh2BULua0ptPDCBLSzy/RSdMtEHRoQIJWzqB7T3kawcNoTwM+4GXd2d3Y3GraYqihyHMEFCfPdMVE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=OlfAY7dm; arc=none smtp.client-ip=115.124.30.110 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="OlfAY7dm" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1706866812; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=d8aeUi6E0rYsOpAp/7wCsETF1KZoFRrblHa5I1yDxyY=; b=OlfAY7dmIPPqQe0KrOjzfnnLapvf2j/ux7zpiJmoO5bDYcte+EuoGUY1DugaXkDFHQCP9hGSInVEZAbO6YuRu1YIexvjfWBdIv/DEp+v0NhenGSKJNBFWJZOWHjZ5jPTv1G0U2CzCNOgX0ezr4bseX6S12cj8+i1MYS9BOU8S0s= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R441e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045170;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=36;SR=0;TI=SMTPD_---0W.wbNFS_1706866810; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0W.wbNFS_1706866810) by smtp.aliyun-inc.com; Fri, 02 Feb 2024 17:40:11 +0800 From: Xuan Zhuo To: virtualization@lists.linux.dev Cc: Richard Weinberger , Anton Ivanov , Johannes Berg , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Hans de Goede , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Vadim Pasternak , Bjorn Andersson , Mathieu Poirier , Cornelia Huck , Halil Pasic , Eric Farman , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Benjamin Berg , linux-um@lists.infradead.org, netdev@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH vhost v1 11/19] virtio: find_vqs: add new parameter premapped Date: Fri, 2 Feb 2024 17:39:43 +0800 Message-Id: <20240202093951.120283-12-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240202093951.120283-1-xuanzhuo@linux.alibaba.com> References: <20240202093951.120283-1-xuanzhuo@linux.alibaba.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Git-Hash: 4c7bacd05cb8 If the premapped mode is enabled, the dma array(struct vring_desc_dma) of virtio core will not be allocated. That is judged when find_vqs() is called. To avoid allocating dma array in find_vqs() and releasing it immediately by virtqueue_set_dma_premapped(). This patch introduces a new parameter to find_vqs(). Then we can judge should we allocate the dma array(struct vring_desc_dma) or not inside find_vqs(). The driver must check the premapped mode of every vq after find_vqs(). Signed-off-by: Xuan Zhuo --- drivers/virtio/virtio_ring.c | 4 ++-- include/linux/virtio_config.h | 1 + 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index d09572dadd9e..5a9d8cb9ab0e 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -2145,7 +2145,7 @@ static struct virtqueue *vring_create_virtqueue_packed(struct virtio_device *vde vq->packed_ring = true; vq->dma_dev = dma_dev; vq->use_dma_api = vring_use_dma_api(vdev); - vq->premapped = false; + vq->premapped = vq->use_dma_api && cfg_vq_get(cfg, premapped); vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) && !cfg_vq_get(cfg, ctx); @@ -2687,7 +2687,7 @@ static struct virtqueue *__vring_new_virtqueue(struct virtio_device *vdev, #endif vq->dma_dev = tp_cfg->dma_dev; vq->use_dma_api = vring_use_dma_api(vdev); - vq->premapped = false; + vq->premapped = vq->use_dma_api && cfg_vq_get(cfg, premapped); vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) && !cfg_vq_get(cfg, ctx); diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index ffe18c3815fc..18919d1384bb 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -105,6 +105,7 @@ struct virtio_vq_config { vq_callback_t **callbacks; const char **names; const bool *ctx; + const bool *premapped; struct irq_affinity *desc; };