From patchwork Wed Mar 24 19:28:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bodo Stroesser X-Patchwork-Id: 409219 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D0A6EC433E9 for ; Wed, 24 Mar 2021 19:29:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BED2B61A21 for ; Wed, 24 Mar 2021 19:29:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237709AbhCXT3X (ORCPT ); Wed, 24 Mar 2021 15:29:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58930 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237755AbhCXT3C (ORCPT ); Wed, 24 Mar 2021 15:29:02 -0400 Received: from mail-ej1-x62d.google.com (mail-ej1-x62d.google.com [IPv6:2a00:1450:4864:20::62d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F3C55C061763; Wed, 24 Mar 2021 12:29:01 -0700 (PDT) Received: by mail-ej1-x62d.google.com with SMTP id k10so34814150ejg.0; Wed, 24 Mar 2021 12:29:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=dzcjbeFj+WpxxyXTlFQ0pILyU0z24ZRfU4LjJPFEC9Y=; b=aAfYYdY2MkfeQ5kX7eTV7I5HpN0Q3T6I/ENqrCmVXqxojtf7VSRhXcd9G5ltyzQPu3 qlmYOd6spBskWhqeH/IsEQz734PxsZGB6lm/cbTq6prarXxTORy5RmM2zGZ6VB04WL2M CsmyJ3eNis46Km80thkgQrvIARa02mi/vos6JxlFHPn1H+3FTc/ZmQm8548O2e8FSYLR 1czpJe3RD6R6UQELE5BAn07kgWtY9Jbl74hxqF8B8ZL/XALhn10v7eDXI0u6+FR2ju7p l9DVOY4ZKa4TKCDqriI8B9+nvU5K2BFus00A701ctX3qcJREQcTAMjCkBsF00OiL6yMD cobg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=dzcjbeFj+WpxxyXTlFQ0pILyU0z24ZRfU4LjJPFEC9Y=; b=YlNGH58X2V3MD02FbXqOV2FuRg9b6uF9qIU4JR7+ggonkiEp9s4PlNWES7X5qrLbVW C38jJKNc+bWfuqsOkNYDQPhdW3b9bTV0BmA/NOhI6m5phPGCBbwdf+3YftIG6AzNPf/6 DnWoCH1ZG0rzmtEFjSn4AqwA2ePkduEL4r9i6+uW3YoLRmE3Z7NDDLx3/V2gwl4TIQqw BUpY09Zhctw6ODzk+LKKV0VOhqN05BwQ2B/QVe9VAd6g6y3zL8ghvPmGcK5g0bMGZ2p3 aJf/0leIzISqre9NFQ+8VjAMbLS43yUuL3VQJFNcOXS854loF6KxKtIcJzAHz3a49NkC Q5UA== X-Gm-Message-State: AOAM5304awU2iHEFjupS9qJF77iecyMAjLHCiYprkO2q5wTR0bGJUW9H U+JRn0Nt3F0aVBMY83Uc4v8ZUlm+uWY= X-Google-Smtp-Source: ABdhPJzBcNBJ6sH5ucFxr5Jwq7lzVvoC4G6C6082pRuPGcCRWzE6davfPLT12nk4KgeZtBfgkwpbwQ== X-Received: by 2002:a17:906:ae88:: with SMTP id md8mr5312924ejb.264.1616614140694; Wed, 24 Mar 2021 12:29:00 -0700 (PDT) Received: from localhost (ipbcc11466.dynamic.kabel-deutschland.de. [188.193.20.102]) by smtp.gmail.com with ESMTPSA id mp12sm1316886ejc.1.2021.03.24.12.29.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 24 Mar 2021 12:29:00 -0700 (PDT) From: Bodo Stroesser To: linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, "Martin K. Petersen" Cc: Bodo Stroesser , Mike Christie Subject: [PATCH 1/6] scsi: target: tcmu: Adjust names of variables and definitions Date: Wed, 24 Mar 2021 20:28:37 +0100 Message-Id: <20210324192842.30446-2-bostroesser@gmail.com> X-Mailer: git-send-email 2.12.3 In-Reply-To: <20210324192842.30446-1-bostroesser@gmail.com> References: <20210324192842.30446-1-bostroesser@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Bodo Stroesser Some definitions and members of struct tcmu_dev had misleading names. Examples: - ring_size was used for the size of mailbox + cmd ring + data area - CMDR_SIZE was used for size of mailbox + cmd ring I added the new definition MB_CMDR_SIZE (mailbox + command ring), changed CMDR_SIZE to hold the size of the command ring only and replaced in struct tcmu_dev the member ring_size with mmap_pages, because the member is now used in tcmu_mmap() only, where we need page count, not size. I also added the new struct tcmu_dev member 'cmdr' which is used to replace some occurences of '(void *)mb + CMDR_OFF' with 'udev->cmdr' for better readability. Signed-off-by: Bodo Stroesser --- drivers/target/target_core_user.c | 39 ++++++++++++++++++++++----------------- 1 file changed, 22 insertions(+), 17 deletions(-) diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index bdfc057f000c..35975dd75dde 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -60,8 +60,11 @@ #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) -/* For cmd area, the size is fixed 8MB */ -#define CMDR_SIZE (8 * 1024 * 1024) +/* For mailbox plus cmd ring, the size is fixed 8MB */ +#define MB_CMDR_SIZE (8 * 1024 * 1024) +/* Offset of cmd ring is size of mailbox */ +#define CMDR_OFF sizeof(struct tcmu_mailbox) +#define CMDR_SIZE (MB_CMDR_SIZE - CMDR_OFF) /* * For data area, the block size is PAGE_SIZE and @@ -126,8 +129,10 @@ struct tcmu_dev { struct inode *inode; - struct tcmu_mailbox *mb_addr; uint64_t dev_size; + + struct tcmu_mailbox *mb_addr; + void *cmdr; u32 cmdr_size; u32 cmdr_last_cleaned; /* Offset of data area from start of mb */ @@ -135,7 +140,7 @@ struct tcmu_dev { size_t data_off; size_t data_size; uint32_t max_blocks; - size_t ring_size; + size_t mmap_pages; struct mutex cmdr_lock; struct list_head qfull_queue; @@ -166,8 +171,6 @@ struct tcmu_dev { #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) -#define CMDR_OFF sizeof(struct tcmu_mailbox) - struct tcmu_cmd { struct se_cmd *se_cmd; struct tcmu_dev *tcmu_dev; @@ -941,7 +944,7 @@ static uint32_t ring_insert_padding(struct tcmu_dev *udev, size_t cmd_size) if (head_to_end(cmd_head, udev->cmdr_size) < cmd_size) { size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); - hdr = (void *) mb + CMDR_OFF + cmd_head; + hdr = udev->cmdr + cmd_head; tcmu_hdr_set_op(&hdr->len_op, TCMU_OP_PAD); tcmu_hdr_set_len(&hdr->len_op, pad_size); hdr->cmd_id = 0; /* not used for PAD */ @@ -1065,7 +1068,7 @@ static int queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, sense_reason_t *scsi_err) cmd_head = ring_insert_padding(udev, command_size); - entry = (void *) mb + CMDR_OFF + cmd_head; + entry = udev->cmdr + cmd_head; memset(entry, 0, command_size); tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); @@ -1157,7 +1160,7 @@ queue_tmr_ring(struct tcmu_dev *udev, struct tcmu_tmr *tmr) cmd_head = ring_insert_padding(udev, cmd_size); - entry = (void *)mb + CMDR_OFF + cmd_head; + entry = udev->cmdr + cmd_head; memset(entry, 0, cmd_size); tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_TMR); tcmu_hdr_set_len(&entry->hdr.len_op, cmd_size); @@ -1412,7 +1415,7 @@ static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) while (udev->cmdr_last_cleaned != READ_ONCE(mb->cmd_tail)) { - struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; + struct tcmu_cmd_entry *entry = udev->cmdr + udev->cmdr_last_cleaned; /* * Flush max. up to end of cmd ring since current entry might @@ -1851,7 +1854,7 @@ static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) vma->vm_private_data = udev; /* Ensure the mmap is exactly the right size */ - if (vma_pages(vma) != (udev->ring_size >> PAGE_SHIFT)) + if (vma_pages(vma) != udev->mmap_pages) return -EINVAL; tcmu_vma_open(vma); @@ -2100,20 +2103,22 @@ static int tcmu_configure_device(struct se_device *dev) goto err_bitmap_alloc; } - udev->mb_addr = vzalloc(CMDR_SIZE); - if (!udev->mb_addr) { + mb = vzalloc(MB_CMDR_SIZE); + if (!mb) { ret = -ENOMEM; goto err_vzalloc; } /* mailbox fits in first part of CMDR space */ - udev->cmdr_size = CMDR_SIZE - CMDR_OFF; - udev->data_off = CMDR_SIZE; + udev->mb_addr = mb; + udev->cmdr = (void *)mb + CMDR_OFF; + udev->cmdr_size = CMDR_SIZE; + udev->data_off = MB_CMDR_SIZE; udev->data_size = udev->max_blocks * DATA_BLOCK_SIZE; + udev->mmap_pages = (udev->data_size + MB_CMDR_SIZE) >> PAGE_SHIFT; udev->dbi_thresh = 0; /* Default in Idle state */ /* Initialise the mailbox of the ring buffer */ - mb = udev->mb_addr; mb->version = TCMU_MAILBOX_VERSION; mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC | TCMU_MAILBOX_FLAG_CAP_READ_LEN | @@ -2129,7 +2134,7 @@ static int tcmu_configure_device(struct se_device *dev) info->mem[0].name = "tcm-user command & data buffer"; info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; - info->mem[0].size = udev->ring_size = udev->data_size + CMDR_SIZE; + info->mem[0].size = udev->data_size + MB_CMDR_SIZE; info->mem[0].memtype = UIO_MEM_NONE; info->irqcontrol = tcmu_irqcontrol;