From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1A97BC369D5 for ; Mon, 28 Apr 2025 13:05:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=W6Sf5HF6wK2zSXMRmSetEddD6WjqlO4aIF9w7KgOU+8=; b=nth0iGSXyk1DcpKAiUP75s49T+ QkBahYZEHuoaVbUi69hXUkJPpUEX5wlIWzaWWvbTG9qizYlOy/OQX/SM6lmPAK159YdFC1Ejp6E9Z 7vpHJzgwm8xVrmvmzKS7w+jEfSoXcMqCINz3tQk2/1/nhA8GURO9tWgXb166KCpHoGNImtyOQEI5M FXv3DxOd0Z86Ck5jpgm/kKRLnNCZ464dSZrsbzAP0/9GNQJfGfDSwRfyrxlWxJ0lhQg13qc8UtCaD uQtAzXlxUNRBugxqQMqYQbLQCMGMmGxC38PisI2zI+8KcYmvWpUHsEAOWhmpoFJwuh+ZliuVbw2LA XbENLE2g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1u9OAW-00000006KjZ-2SEL; Mon, 28 Apr 2025 13:05:08 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1u9Kif-00000005aus-1pgb for linux-nvme@lists.infradead.org; Mon, 28 Apr 2025 09:24:11 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 1E8FD438EC; Mon, 28 Apr 2025 09:24:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 32880C4CEF1; Mon, 28 Apr 2025 09:24:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1745832249; bh=UaKpIS/gS7437zv6/V/pxWOCRAoH+oFaLCUvPin30s0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=G/Ukn2zSIrjyDxxMBbuxC8G0NNgq427GlA1UdIt9h8WdAt09mSJLJAba2Uk1lLjdc hH7iI67XbyEfiLiAGReOTrPmgM+2w6SXxCJhYj0DC/2JppgeGqGcc8yp0T02GPKplm cxh7af7jGCCF9Z1YVpTA5n7AZuT01VsUpgTbUveUSNG0zsBx2D91spU8nHzbKdRJPk gcuUZzojGyQ2vTalz6AsYECS4vE2AKqovwQhgogBprkg3X9XO2QD386PwCYLTjClDm L2sa6AahrrOtplIHyeQQ0WtZk2mTFeZYNwAoQ0Zr4eUW7xrMGIsTElcXX97TUuMb9O RMHi0c0PYikjA== From: Leon Romanovsky To: Marek Szyprowski , Jens Axboe , Christoph Hellwig , Keith Busch Cc: Jake Edge , Jonathan Corbet , Jason Gunthorpe , Zhu Yanjun , Robin Murphy , Joerg Roedel , Will Deacon , Sagi Grimberg , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Andrew Morton , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, linux-nvme@lists.infradead.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, Niklas Schnelle , Chuck Lever , Luis Chamberlain , Matthew Wilcox , Dan Williams , Kanchan Joshi , Chaitanya Kulkarni , Leon Romanovsky Subject: [PATCH v10 21/24] nvme-pci: remove struct nvme_descriptor Date: Mon, 28 Apr 2025 12:22:27 +0300 Message-ID: X-Mailer: git-send-email 2.49.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250428_022409_521918_DB009DCC X-CRM114-Status: GOOD ( 22.34 ) X-Mailman-Approved-At: Mon, 28 Apr 2025 05:19:59 -0700 X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org From: Christoph Hellwig There is no real point in having a union of two pointer types here, just use a void pointer as we mix and match types between the arms of the union between the allocation and freeing side already. Also rename the nr_allocations field to nr_descriptors to better describe what it does. Signed-off-by: Christoph Hellwig Tested-by: Jens Axboe Signed-off-by: Leon Romanovsky --- drivers/nvme/host/pci.c | 57 +++++++++++++++++------------------------ 1 file changed, 24 insertions(+), 33 deletions(-) diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index b178d52eac1b..638e759b29ad 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -43,7 +43,7 @@ #define NVME_MAX_KB_SZ 8192 #define NVME_MAX_SEGS 128 #define NVME_MAX_META_SEGS 15 -#define NVME_MAX_NR_ALLOCATIONS 5 +#define NVME_MAX_NR_DESCRIPTORS 5 static int use_threaded_interrupts; module_param(use_threaded_interrupts, int, 0444); @@ -219,30 +219,22 @@ struct nvme_queue { struct completion delete_done; }; -union nvme_descriptor { - struct nvme_sgl_desc *sg_list; - __le64 *prp_list; -}; - /* * The nvme_iod describes the data in an I/O. - * - * The sg pointer contains the list of PRP/SGL chunk allocations in addition - * to the actual struct scatterlist. */ struct nvme_iod { struct nvme_request req; struct nvme_command cmd; bool aborted; - s8 nr_allocations; /* PRP list pool allocations. 0 means small - pool in use */ + /* # of PRP/SGL descriptors: (0 for small pool) */ + s8 nr_descriptors; unsigned int dma_len; /* length of single DMA segment mapping */ dma_addr_t first_dma; dma_addr_t meta_dma; struct sg_table sgt; struct sg_table meta_sgt; - union nvme_descriptor meta_list; - union nvme_descriptor list[NVME_MAX_NR_ALLOCATIONS]; + void *meta_list; + void *descriptors[NVME_MAX_NR_DESCRIPTORS]; }; static inline unsigned int nvme_dbbuf_size(struct nvme_dev *dev) @@ -544,8 +536,8 @@ static void nvme_free_prps(struct nvme_dev *dev, struct request *req) dma_addr_t dma_addr = iod->first_dma; int i; - for (i = 0; i < iod->nr_allocations; i++) { - __le64 *prp_list = iod->list[i].prp_list; + for (i = 0; i < iod->nr_descriptors; i++) { + __le64 *prp_list = iod->descriptors[i]; dma_addr_t next_dma_addr = le64_to_cpu(prp_list[last_prp]); dma_pool_free(dev->prp_page_pool, prp_list, dma_addr); @@ -567,11 +559,11 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) dma_unmap_sgtable(dev->dev, &iod->sgt, rq_dma_dir(req), 0); - if (iod->nr_allocations == 0) - dma_pool_free(dev->prp_small_pool, iod->list[0].sg_list, + if (iod->nr_descriptors == 0) + dma_pool_free(dev->prp_small_pool, iod->descriptors[0], iod->first_dma); - else if (iod->nr_allocations == 1) - dma_pool_free(dev->prp_page_pool, iod->list[0].sg_list, + else if (iod->nr_descriptors == 1) + dma_pool_free(dev->prp_page_pool, iod->descriptors[0], iod->first_dma); else nvme_free_prps(dev, req); @@ -629,18 +621,18 @@ static blk_status_t nvme_pci_setup_prps(struct nvme_dev *dev, nprps = DIV_ROUND_UP(length, NVME_CTRL_PAGE_SIZE); if (nprps <= (256 / 8)) { pool = dev->prp_small_pool; - iod->nr_allocations = 0; + iod->nr_descriptors = 0; } else { pool = dev->prp_page_pool; - iod->nr_allocations = 1; + iod->nr_descriptors = 1; } prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); if (!prp_list) { - iod->nr_allocations = -1; + iod->nr_descriptors = -1; return BLK_STS_RESOURCE; } - iod->list[0].prp_list = prp_list; + iod->descriptors[0] = prp_list; iod->first_dma = prp_dma; i = 0; for (;;) { @@ -649,7 +641,7 @@ static blk_status_t nvme_pci_setup_prps(struct nvme_dev *dev, prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); if (!prp_list) goto free_prps; - iod->list[iod->nr_allocations++].prp_list = prp_list; + iod->descriptors[iod->nr_descriptors++] = prp_list; prp_list[0] = old_prp_list[i - 1]; old_prp_list[i - 1] = cpu_to_le64(prp_dma); i = 1; @@ -719,19 +711,19 @@ static blk_status_t nvme_pci_setup_sgls(struct nvme_dev *dev, if (entries <= (256 / sizeof(struct nvme_sgl_desc))) { pool = dev->prp_small_pool; - iod->nr_allocations = 0; + iod->nr_descriptors = 0; } else { pool = dev->prp_page_pool; - iod->nr_allocations = 1; + iod->nr_descriptors = 1; } sg_list = dma_pool_alloc(pool, GFP_ATOMIC, &sgl_dma); if (!sg_list) { - iod->nr_allocations = -1; + iod->nr_descriptors = -1; return BLK_STS_RESOURCE; } - iod->list[0].sg_list = sg_list; + iod->descriptors[0] = sg_list; iod->first_dma = sgl_dma; nvme_pci_sgl_set_seg(&cmd->dptr.sgl, sgl_dma, entries); @@ -870,7 +862,7 @@ static blk_status_t nvme_pci_setup_meta_sgls(struct nvme_dev *dev, goto out_unmap_sg; entries = iod->meta_sgt.nents; - iod->meta_list.sg_list = sg_list; + iod->meta_list = sg_list; iod->meta_dma = sgl_dma; cmnd->flags = NVME_CMD_SGL_METASEG; @@ -923,7 +915,7 @@ static blk_status_t nvme_prep_rq(struct nvme_dev *dev, struct request *req) blk_status_t ret; iod->aborted = false; - iod->nr_allocations = -1; + iod->nr_descriptors = -1; iod->sgt.nents = 0; iod->meta_sgt.nents = 0; @@ -1048,8 +1040,7 @@ static __always_inline void nvme_unmap_metadata(struct nvme_dev *dev, return; } - dma_pool_free(dev->prp_small_pool, iod->meta_list.sg_list, - iod->meta_dma); + dma_pool_free(dev->prp_small_pool, iod->meta_list, iod->meta_dma); dma_unmap_sgtable(dev->dev, &iod->meta_sgt, rq_dma_dir(req), 0); mempool_free(iod->meta_sgt.sgl, dev->iod_meta_mempool); } @@ -3801,7 +3792,7 @@ static int __init nvme_init(void) BUILD_BUG_ON(IRQ_AFFINITY_MAX_SETS < 2); BUILD_BUG_ON(NVME_MAX_SEGS > SGES_PER_PAGE); BUILD_BUG_ON(sizeof(struct scatterlist) * NVME_MAX_SEGS > PAGE_SIZE); - BUILD_BUG_ON(nvme_pci_npages_prp() > NVME_MAX_NR_ALLOCATIONS); + BUILD_BUG_ON(nvme_pci_npages_prp() > NVME_MAX_NR_DESCRIPTORS); return pci_register_driver(&nvme_driver); } -- 2.49.0