From patchwork Mon Sep 25 06:14:47 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 9969255 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0C7856038E for ; Mon, 25 Sep 2017 06:15:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 13AAA28BB1 for ; Mon, 25 Sep 2017 06:15:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0860B28BB0; Mon, 25 Sep 2017 06:15:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9B47128BB1 for ; Mon, 25 Sep 2017 06:15:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932421AbdIYGPH (ORCPT ); Mon, 25 Sep 2017 02:15:07 -0400 Received: from esa5.hgst.iphmx.com ([216.71.153.144]:20333 "EHLO esa5.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932406AbdIYGPG (ORCPT ); Mon, 25 Sep 2017 02:15:06 -0400 X-IronPort-AV: E=Sophos;i="5.42,435,1500912000"; d="scan'208";a="53984155" Received: from sjappemgw11.hgst.com (HELO sjappemgw12.hgst.com) ([199.255.44.62]) by ob1.hgst.iphmx.com with ESMTP; 25 Sep 2017 14:15:06 +0800 Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by sjappemgw12.hgst.com with ESMTP; 24 Sep 2017 23:15:05 -0700 From: Damien Le Moal To: linux-scsi@vger.kernel.org, "Martin K . Petersen" , linux-block@vger.kernel.org, Jens Axboe Cc: Christoph Hellwig , Bart Van Assche Subject: [PATCH V5 07/14] scsi: sd_zbc: Initialize device request queue zoned data Date: Mon, 25 Sep 2017 15:14:47 +0900 Message-Id: <20170925061454.5533-8-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.13.5 In-Reply-To: <20170925061454.5533-1-damien.lemoal@wdc.com> References: <20170925061454.5533-1-damien.lemoal@wdc.com> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Initialize the seq_zone_bitmap and nr_zones fields of the disk request queue on disk revalidate. As the seq_zone_bitmap allocation is identical to the allocation of the zone write lock bitmap, introduce the helper sd_zbc_alloc_zone_bitmap(). Using this helper, wait for the disk capacity and number of zones to stabilize on the second revalidation pass to allocate and initialize the bitmaps. Signed-off-by: Damien Le Moal --- drivers/scsi/sd_zbc.c | 144 ++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 139 insertions(+), 5 deletions(-) diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c index 27793b9f54c0..cc64fada9cd9 100644 --- a/drivers/scsi/sd_zbc.c +++ b/drivers/scsi/sd_zbc.c @@ -586,8 +586,127 @@ static int sd_zbc_check_zone_size(struct scsi_disk *sdkp) return 0; } +/** + * sd_zbc_alloc_zone_bitmap - Allocate a zone bitmap (one bit per zone). + * @sdkp: The disk of the bitmap + */ +static inline unsigned long *sd_zbc_alloc_zone_bitmap(struct scsi_disk *sdkp) +{ + struct request_queue *q = sdkp->disk->queue; + + return kzalloc_node(BITS_TO_LONGS(sdkp->nr_zones) + * sizeof(unsigned long), + GFP_KERNEL, q->node); +} + +/** + * sd_zbc_get_seq_zones - Parse report zones reply to identify sequential zones + * @sdkp: disk used + * @buf: report reply buffer + * @seq_zone_bitamp: bitmap of sequential zones to set + * @zno: Zone number of the first zone in the report + * + * Parse reported zone descriptors to find sequiential zones. + * Since read-only and offline zones cannot be written, do not + * mark them as sequential in the bitmap. + * Return the LBA after the last zone reported. + */ +static sector_t sd_zbc_get_seq_zones(struct scsi_disk *sdkp, unsigned char *buf, + unsigned int buflen, + unsigned long *seq_zone_bitmap, + unsigned int *zno) +{ + sector_t last_lba = sdkp->capacity; + unsigned int buf_len, list_length; + unsigned int n = *zno; + unsigned char *rec; + u8 type, cond; + + list_length = get_unaligned_be32(&buf[0]) + 64; + buf_len = min(list_length, buflen); + rec = buf + 64; + + while (rec < buf + buf_len) { + type = rec[0] & 0x0f; + cond = (rec[1] >> 4) & 0xf; + if (type != ZBC_ZONE_TYPE_CONV && + cond != ZBC_ZONE_COND_READONLY && + cond != ZBC_ZONE_COND_OFFLINE) + set_bit(n, seq_zone_bitmap); + last_lba = get_unaligned_be64(&rec[8]) + + get_unaligned_be64(&rec[16]); + rec += 64; + n++; + } + + *zno = n; + + return last_lba; +} + +/** + * sd_zbc_setup_seq_zone_bitmap - Initialize the disk seq zone bitmap. + * @sdkp: target disk + * + * Allocate a zone bitmap and initialize it by identifying sequential zones. + */ +static int sd_zbc_setup_seq_zone_bitmap(struct scsi_disk *sdkp) +{ + struct request_queue *q = sdkp->disk->queue; + unsigned long *seq_zone_bitmap; + sector_t lba = 0; + unsigned char *buf; + unsigned int n = 0; + int ret = -ENOMEM; + + seq_zone_bitmap = sd_zbc_alloc_zone_bitmap(sdkp); + if (!seq_zone_bitmap) + return -ENOMEM; + + buf = kmalloc(SD_ZBC_BUF_SIZE, GFP_KERNEL); + if (!buf) + goto out; + + while (lba < sdkp->capacity) { + ret = sd_zbc_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, lba); + if (ret) + goto out; + lba = sd_zbc_get_seq_zones(sdkp, buf, SD_ZBC_BUF_SIZE, + seq_zone_bitmap, &n); + } + + if (n != sdkp->nr_zones) { + /* Something went wrong */ + ret = -EIO; + } + +out: + kfree(buf); + if (ret) { + kfree(seq_zone_bitmap); + return ret; + } + + q->seq_zone_bitmap = seq_zone_bitmap; + + return 0; +} + +static void sd_zbc_cleanup(struct scsi_disk *sdkp) +{ + struct request_queue *q = sdkp->disk->queue; + + kfree(q->seq_zone_bitmap); + q->seq_zone_bitmap = NULL; + + kfree(sdkp->zones_wlock); + sdkp->zones_wlock = NULL; +} + static int sd_zbc_setup(struct scsi_disk *sdkp) { + struct request_queue *q = sdkp->disk->queue; + int ret; /* READ16/WRITE16 is mandatory for ZBC disks */ sdkp->device->use_16_for_rw = 1; @@ -599,14 +718,29 @@ static int sd_zbc_setup(struct scsi_disk *sdkp) sdkp->nr_zones = round_up(sdkp->capacity, sdkp->zone_blocks) >> sdkp->zone_shift; + /* + * Wait for the disk capacity to stabilize before + * initializing zone related information. + */ + if (sdkp->first_scan) + return 0; + if (!sdkp->zones_wlock) { - sdkp->zones_wlock = kcalloc(BITS_TO_LONGS(sdkp->nr_zones), - sizeof(unsigned long), - GFP_KERNEL); + sdkp->zones_wlock = sd_zbc_alloc_zone_bitmap(sdkp); if (!sdkp->zones_wlock) return -ENOMEM; } + if (!q->seq_zone_bitmap) { + ret = sd_zbc_setup_seq_zone_bitmap(sdkp); + if (ret) { + sd_zbc_cleanup(sdkp); + return ret; + } + } + + q->nr_zones = sdkp->nr_zones; + return 0; } @@ -661,14 +795,14 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf) err: sdkp->capacity = 0; + sd_zbc_cleanup(sdkp); return ret; } void sd_zbc_remove(struct scsi_disk *sdkp) { - kfree(sdkp->zones_wlock); - sdkp->zones_wlock = NULL; + sd_zbc_cleanup(sdkp); } void sd_zbc_print_zones(struct scsi_disk *sdkp)