From patchwork Tue Sep 24 01:31:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 13810025 X-Patchwork-Delegate: kuba@kernel.org Received: from out30-132.freemail.mail.aliyun.com (out30-132.freemail.mail.aliyun.com [115.124.30.132]) (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 5C9C08F5C; Tue, 24 Sep 2024 01:32:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.132 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727141538; cv=none; b=VBwXrQMIlo+ndqrlL6XIK7Vjg+LhhGsfEbjFVfqmDTF3LXhjhZJDVL+yrxltM0Yb63zaUPhdPZW98K2js31piMgfsZOhlLM3DDInAXSHc813oa6VVw8MF8foHBGy64hhJ2iTFcsxQb3hYEobCBo5lfXCkrvshpuWihLyVlmboj4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727141538; c=relaxed/simple; bh=MwXZn/WFiz50PnqtFnCpfo0+is+wWuSY3GC8Omwq/Kc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=msNFuX25GE4v5g3hMJOLACD/oPcxX513lh94fGnCQh3+jc9XgWiV1ULtQPKse2j0EFhPJloPSId+RmJoOEg5UBi+kjLEJ0KtTLCXObM1mskXC7wLtmLqeFHjNSVmBYt+oMr4LXUQUQ5q13xqZGw4iaD48spOTxTgxz2Tpt8k4Z8= 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=lTa4jvSd; arc=none smtp.client-ip=115.124.30.132 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="lTa4jvSd" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1727141532; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=9XiPUXKZokOHr/utpsUR403q9gYW7iOtpGK/EALbzZ4=; b=lTa4jvSdTFJzmpW0mq6nu8h8KHYlvluSAKB5EXen70DowRjWyM1z9+LaoUJWrsm2EOkabbcflYHVtZYb+lKq3W9crBMSaymj1q0VlAl0MjJb7zAxKKGc+nA/DTLV8+cWBG21xS9H9QFqzYSd9PYVRo85AOuedjw/A6d5BcUQSuw= Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0WFdtE36_1727141530) by smtp.aliyun-inc.com; Tue, 24 Sep 2024 09:32:10 +0800 From: Xuan Zhuo To: netdev@vger.kernel.org Cc: "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?utf-8?q?Eugenio_P=C3=A9rez?= , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , virtualization@lists.linux.dev, bpf@vger.kernel.org Subject: [RFC net-next v1 06/12] virtio_ring: remove API virtqueue_set_dma_premapped Date: Tue, 24 Sep 2024 09:31:58 +0800 Message-Id: <20240924013204.13763-7-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240924013204.13763-1-xuanzhuo@linux.alibaba.com> References: <20240924013204.13763-1-xuanzhuo@linux.alibaba.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Git-Hash: 83bb687d4b73 X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC Now, this API is useless. remove it. Signed-off-by: Xuan Zhuo --- drivers/virtio/virtio_ring.c | 48 ------------------------------------ include/linux/virtio.h | 2 -- 2 files changed, 50 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index b570acb35d97..6edfcd4d1606 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -180,9 +180,6 @@ struct vring_virtqueue { /* Host publishes avail event idx */ bool event; - /* Do DMA mapping by driver */ - bool premapped; - /* Head of free buffer list. */ unsigned int free_head; /* Number we've added since last sync. */ @@ -2086,7 +2083,6 @@ static struct virtqueue *vring_create_virtqueue_packed( vq->packed_ring = true; vq->dma_dev = dma_dev; vq->use_dma_api = vring_use_dma_api(vdev); - vq->premapped = false; vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) && !context; @@ -2650,7 +2646,6 @@ static struct virtqueue *__vring_new_virtqueue(unsigned int index, #endif vq->dma_dev = dma_dev; vq->use_dma_api = vring_use_dma_api(vdev); - vq->premapped = false; vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) && !context; @@ -2777,49 +2772,6 @@ int virtqueue_resize(struct virtqueue *_vq, u32 num, } EXPORT_SYMBOL_GPL(virtqueue_resize); -/** - * virtqueue_set_dma_premapped - set the vring premapped mode - * @_vq: the struct virtqueue we're talking about. - * - * Enable the premapped mode of the vq. - * - * The vring in premapped mode does not do dma internally, so the driver must - * do dma mapping in advance. The driver must pass the dma_address through - * dma_address of scatterlist. When the driver got a used buffer from - * the vring, it has to unmap the dma address. - * - * This function must be called immediately after creating the vq, or after vq - * reset, and before adding any buffers to it. - * - * Caller must ensure we don't call this with other virtqueue operations - * at the same time (except where noted). - * - * Returns zero or a negative error. - * 0: success. - * -EINVAL: too late to enable premapped mode, the vq already contains buffers. - */ -int virtqueue_set_dma_premapped(struct virtqueue *_vq) -{ - struct vring_virtqueue *vq = to_vvq(_vq); - u32 num; - - START_USE(vq); - - num = vq->packed_ring ? vq->packed.vring.num : vq->split.vring.num; - - if (num != vq->vq.num_free) { - END_USE(vq); - return -EINVAL; - } - - vq->premapped = true; - - END_USE(vq); - - return 0; -} -EXPORT_SYMBOL_GPL(virtqueue_set_dma_premapped); - /** * virtqueue_reset - detach and recycle all unused buffers * @_vq: the struct virtqueue we're talking about. diff --git a/include/linux/virtio.h b/include/linux/virtio.h index 306137a15d07..238728ed62fa 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -82,8 +82,6 @@ bool virtqueue_enable_cb(struct virtqueue *vq); unsigned virtqueue_enable_cb_prepare(struct virtqueue *vq); -int virtqueue_set_dma_premapped(struct virtqueue *_vq); - bool virtqueue_poll(struct virtqueue *vq, unsigned); bool virtqueue_enable_cb_delayed(struct virtqueue *vq);