From patchwork Tue Jan 30 11:42:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 13537395 Received: from out30-130.freemail.mail.aliyun.com (out30-130.freemail.mail.aliyun.com [115.124.30.130]) (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 0EDBC67E8D; Tue, 30 Jan 2024 11:42:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.130 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706614974; cv=none; b=NilF4segIKstwsH+Ed7rROyx+sYtGoCwfLSuZMdN4OaFtbEeyldpxqwdlp2R71b1R9uz9DhcjSD4c03RiSRuIUjl/BZT2Vbslzl1lkcpCNMqC6lPHVKWeE/fDmuxv4tH5b87ht3ZpB7w0AFIj9A2RGQoev/uyic3TKNnVlCFCQ0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706614974; c=relaxed/simple; bh=oC0A2iqTgzltxNX7HZCNhxU/K71nLhzjfobA+3jDzcI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=mgLfMI27fkv7/LpXxEwNc1km7kAHBZDzTlhlR70CFT3ywnWPbbHzudrPNThypOa0who6ygOVd/TbPlky2QWZAAqq1W3PyK4Ronj8ip03umkdn6I5/DzdMa0ylQ+0p+NIbw1Xja/ascuNGt+fj1JOonQHusxcdtwYmUfb732BS8s= 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=c/NwOmRY; arc=none smtp.client-ip=115.124.30.130 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="c/NwOmRY" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1706614964; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=Dgn6m2tLOO6WFRL4YWGeqj72OqIhjZpHBxeWCefu0YE=; b=c/NwOmRYcGH7zZNPG26b2iPGT+oo9sDt7Wn2ZGnjK6cvIMUI9CF4kZu4LIP2bNVrCYzUv9s2DGv3QAVYTpyUa8ppiiT5Ihm2BGIxrjfwvkP5Zu/yUAHHoqzZIkN2YHq/RyrIKUrHbLgTUio1ro/dxNTcQss2jS2IQC2k+cFzzo0= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R171e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045168;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=37;SR=0;TI=SMTPD_---0W.g78-7_1706614961; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0W.g78-7_1706614961) by smtp.aliyun-inc.com; Tue, 30 Jan 2024 19:42:42 +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 , Yang Li , 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 10/17] virtio: find_vqs: add new parameter premapped Date: Tue, 30 Jan 2024 19:42:17 +0800 Message-Id: <20240130114224.86536-11-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240130114224.86536-1-xuanzhuo@linux.alibaba.com> References: <20240130114224.86536-1-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: 239d1d475be4 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 769ec6360d7f..e5e9672b4ab2 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 e2c72e125dae..f462c3f1691c 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 *const *names; const bool *ctx; + const bool *premapped; struct irq_affinity *desc; };