From patchwork Thu Jan 5 22:37:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhu Yanjun X-Patchwork-Id: 13089467 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2F58FC3DA7D for ; Thu, 5 Jan 2023 06:10:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229702AbjAEGKJ (ORCPT ); Thu, 5 Jan 2023 01:10:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43346 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229579AbjAEGKJ (ORCPT ); Thu, 5 Jan 2023 01:10:09 -0500 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7708A2033 for ; Wed, 4 Jan 2023 22:10:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1672899008; x=1704435008; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=qp9wu3lZ5VHt2N73ByVRc5rcdIJ3ZbWedXsieP6UPb0=; b=e+FLGIWJ/U/I3gkxkei04kvFajvMad52/ZkvmJUOx1jGcBAJUgo6PwRq igulMhBUnoxPrdTXk7tRPo8uCCpUWD1/WR4k98csYk7nmf0F1A9erNqZz HufnpiXI0DCYnmNx4nkg2XPGxkpgdL64dBNzMLiokJX1DwKWFNLwAd9xm m4MpK9PfX2qIE43UgyWUMeUz4mnGWtMI1zsd8twP6Id2viY/8KPS78lrX /MPRs2Sf/aVGR1OFrs4HhBbmk04a66vGxH+kHD4sUoDfVyFjfl30hSJUc eT6RUYaAPvfump2NaFbE3wCelN4RvWqfL22mbYapixf2SzcNEY6JmObZa g==; X-IronPort-AV: E=McAfee;i="6500,9779,10580"; a="301820041" X-IronPort-AV: E=Sophos;i="5.96,302,1665471600"; d="scan'208";a="301820041" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Jan 2023 22:10:08 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10580"; a="779467362" X-IronPort-AV: E=Sophos;i="5.96,302,1665471600"; d="scan'208";a="779467362" Received: from unknown (HELO intel-71.bj.intel.com) ([10.238.154.71]) by orsmga004.jf.intel.com with ESMTP; 04 Jan 2023 22:10:05 -0800 From: Zhu Yanjun To: mustafa.ismail@intel.com, shiraz.saleem@intel.com, jgg@ziepe.ca, leon@kernel.org, linux-rdma@vger.kernel.org Cc: Zhu Yanjun Subject: [PATCHv3 for-next 1/1] RDMA/irdma: Add support for dmabuf pin memory regions Date: Thu, 5 Jan 2023 17:37:10 -0500 Message-Id: <20230105223710.973148-1-yanjun.zhu@intel.com> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Zhu Yanjun This is a followup to the EFA dmabuf[1]. Irdma driver currently does not support on-demand-paging(ODP). So it uses habanalabs as the dmabuf exporter, and irdma as the importer to allow for peer2peer access through libibverbs. In this commit, the function ib_umem_dmabuf_get_pinned() is used. This function is introduced in EFA dmabuf[1] which allows the driver to get a dmabuf umem which is pinned and does not require move_notify callback implementation. The returned umem is pinned and DMA mapped like standard cpu umems, and is released through ib_umem_release(). [1]https://lore.kernel.org/lkml/20211007114018.GD2688930@ziepe.ca/t/ Signed-off-by: Zhu Yanjun --- V2->V3: Simplify the function by removing QP and CQ handling; V1->V2: Fix the build warning by adding a static; --- drivers/infiniband/hw/irdma/verbs.c | 97 +++++++++++++++++++++++++++++ 1 file changed, 97 insertions(+) diff --git a/drivers/infiniband/hw/irdma/verbs.c b/drivers/infiniband/hw/irdma/verbs.c index f6973ea55eda..7028b8af87b9 100644 --- a/drivers/infiniband/hw/irdma/verbs.c +++ b/drivers/infiniband/hw/irdma/verbs.c @@ -2912,6 +2912,102 @@ static struct ib_mr *irdma_reg_user_mr(struct ib_pd *pd, u64 start, u64 len, return ERR_PTR(err); } +static struct ib_mr *irdma_reg_user_mr_dmabuf(struct ib_pd *pd, u64 start, + u64 len, u64 virt, + int fd, int access, + struct ib_udata *udata) +{ + struct irdma_device *iwdev = to_iwdev(pd->device); + struct irdma_pble_alloc *palloc; + struct irdma_pbl *iwpbl; + struct irdma_mr *iwmr; + u32 stag = 0; + bool use_pbles = false; + int err = -EINVAL; + struct ib_umem_dmabuf *umem_dmabuf; + + if (len > iwdev->rf->sc_dev.hw_attrs.max_mr_size) + return ERR_PTR(-EINVAL); + + if (udata->inlen < IRDMA_MEM_REG_MIN_REQ_LEN) + return ERR_PTR(-EINVAL); + + umem_dmabuf = ib_umem_dmabuf_get_pinned(pd->device, start, len, fd, + access); + if (IS_ERR(umem_dmabuf)) { + err = PTR_ERR(umem_dmabuf); + ibdev_dbg(&iwdev->ibdev, "Failed to get dmabuf umem[%d]\n", err); + return ERR_PTR(err); + } + + iwmr = kzalloc(sizeof(*iwmr), GFP_KERNEL); + if (!iwmr) { + ib_umem_release(&umem_dmabuf->umem); + return ERR_PTR(-ENOMEM); + } + + iwpbl = &iwmr->iwpbl; + iwpbl->iwmr = iwmr; + iwmr->region = &umem_dmabuf->umem; + iwmr->ibmr.pd = pd; + iwmr->ibmr.device = pd->device; + iwmr->ibmr.iova = virt; + + iwmr->page_size = ib_umem_find_best_pgsz(iwmr->region, + iwdev->rf->sc_dev.hw_attrs.page_size_cap, + virt); + if (unlikely(!iwmr->page_size)) { + kfree(iwmr); + ib_umem_release(iwmr->region); + return ERR_PTR(-EOPNOTSUPP); + } + + iwmr->len = iwmr->region->length; + iwpbl->user_base = virt; + palloc = &iwpbl->pble_alloc; + iwmr->type = IRDMA_MEMREG_TYPE_MEM; + iwmr->page_cnt = ib_umem_num_dma_blocks(iwmr->region, iwmr->page_size); + + use_pbles = (iwmr->page_cnt != 1); + + err = irdma_setup_pbles(iwdev->rf, iwmr, use_pbles, false); + if (err) + goto error; + + if (use_pbles) { + err = irdma_check_mr_contiguous(palloc, iwmr->page_size); + if (err) { + irdma_free_pble(iwdev->rf->pble_rsrc, palloc); + iwpbl->pbl_allocated = false; + } + } + + stag = irdma_create_stag(iwdev); + if (!stag) { + err = -ENOMEM; + goto error; + } + + iwmr->stag = stag; + iwmr->ibmr.rkey = stag; + iwmr->ibmr.lkey = stag; + err = irdma_hwreg_mr(iwdev, iwmr, access); + if (err) { + irdma_free_stag(iwdev, stag); + goto error; + } + + return &iwmr->ibmr; + +error: + if (palloc->level != PBLE_LEVEL_0 && iwpbl->pbl_allocated) + irdma_free_pble(iwdev->rf->pble_rsrc, palloc); + kfree(iwmr); + ib_umem_release(&umem_dmabuf->umem); + + return ERR_PTR(err); +} + /** * irdma_reg_phys_mr - register kernel physical memory * @pd: ibpd pointer @@ -4418,6 +4514,7 @@ static const struct ib_device_ops irdma_dev_ops = { .query_port = irdma_query_port, .query_qp = irdma_query_qp, .reg_user_mr = irdma_reg_user_mr, + .reg_user_mr_dmabuf = irdma_reg_user_mr_dmabuf, .req_notify_cq = irdma_req_notify_cq, .resize_cq = irdma_resize_cq, INIT_RDMA_OBJ_SIZE(ib_pd, irdma_pd, ibpd),