From patchwork Fri Aug 6 07:42:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 12422849 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 14B5DC432BE for ; Fri, 6 Aug 2021 07:43:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E6B1861050 for ; Fri, 6 Aug 2021 07:43:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241166AbhHFHn0 (ORCPT ); Fri, 6 Aug 2021 03:43:26 -0400 Received: from esa3.hgst.iphmx.com ([216.71.153.141]:24093 "EHLO esa3.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240392AbhHFHnW (ORCPT ); Fri, 6 Aug 2021 03:43:22 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1628235786; x=1659771786; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=dxUqBpMfBGL8QgT/G4aYqB14OK8eppkoSmc37wpGAVA=; b=q1rvwL6GdGYrrEnysLazGCqKlEURyGYX2Lz77GQUNXB2P7L9+Do3QQEn lV888T2mjlYKgYuQz6uxCIK+NcmNhkak/AJGGO4WRVQ2tmwqwtNjhZ+Zl y87no/zTIZGd2ZRy8YTVlH3w+yyWKEa19asIsVTN8EkI91A7UNs8XwK4f 8hO1lch39EpPPvxnAQUcX2Ll2d3wOX0Uoc+NnMbQtM13K/fU2BfLt8P7U 9b0h0eRmOECVar+ZmzJ4DDaE2/3RqIwJBiaILq6MdHEdjeePlVQzoX7yj hR2nunI23FEMd16MgSJn8hPEzqTlO3P/sq+or3PXZrvR5bQyPsIe3RIQr Q==; X-IronPort-AV: E=Sophos;i="5.84,300,1620662400"; d="scan'208";a="181296862" Received: from h199-255-45-14.hgst.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 06 Aug 2021 15:43:06 +0800 IronPort-SDR: OVn+zhAm+ajheG8cfo9i5NIAn0xeJNOuV1Oz1xvNeyELG1BHz4Q4+b4J2mK2Ah6b1TBh2r3dRR 0cz1je3XWKi+YzCrMEH2gEGrjjfrjduzhlVKvCItHc4oPsWRVmW+icIqs4ISYRSu01zP0IewYp 1Q9DEdviSceZG9EXuPX5pS/kV5LrZT+Il24k2p0FFoUwITsxuDwTbfTVV/2YZYjqy7o+4Zeiyf 0K8MeXzo9zmCuqE23h6qV24ES18wF95OQ2nxTTMKTOs1nZGVrGaVMMrqP3dctr7twKiMJHp4C0 ccjMpsYC6PGvGFS8rkFtZTok Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep01.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Aug 2021 00:20:35 -0700 IronPort-SDR: dvH2ITMNED8Yc5D9k3khnKoOeYImeai83+ykB4R4PundXhR9Ir30Q70TaKH9VW1relrjf+MnHs askepwacX/RxcBKiKLP/wMxhFWnIunvTwZV6XajQkHIWOWoXv7pm5InqmmUMjZhbzGRo7Jmsk5 n6vFJNgXSlIYZnneO/zRDOwmZUY9SY4yBhk5fJk+FfipVboqtw1TaReNPRTa2KxPAJWnRNo4YB DtFpYBp0kIxSad/RgllC2bsjD9iG+4sD+JbOj7DXSALmJduFCurk33OQJ1y7tzSIpQQXGxPF2U 70c= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip02.wdc.com with ESMTP; 06 Aug 2021 00:43:05 -0700 From: Damien Le Moal To: Jens Axboe , linux-block@vger.kernel.org, linux-ide@vger.kernel.org, "Martin K . Petersen" , linux-scsi@vger.kernel.org Cc: Sathya Prakash , Sreekanth Reddy , Suganath Prabu Subramani Subject: [PATCH v2 8/9] libahci: Introduce ncq_prio_supported sysfs sttribute Date: Fri, 6 Aug 2021 16:42:51 +0900 Message-Id: <20210806074252.398482-9-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210806074252.398482-1-damien.lemoal@wdc.com> References: <20210806074252.398482-1-damien.lemoal@wdc.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Currently, the only way a user can determine if a SATA device supports NCQ priority is to try to enable the use of this feature using the ncq_prio_enable sysfs device attribute. If enabling the feature fails, it is because the device does not support NCQ priority. Otherwise, the feature is enabled and indicates that the device supports NCQ priority. Improve this odd interface by introducing the read-only ncq_prio_supported sysfs device attribute to indicate if a SATA device supports NCQ priority. The value of this attribute reflects if the device flag ATA_DFLAG_NCQ_PRIO is set or cleared. Signed-off-by: Damien Le Moal --- drivers/ata/libahci.c | 1 + drivers/ata/libata-sata.c | 24 ++++++++++++++++++++++++ include/linux/libata.h | 1 + 3 files changed, 26 insertions(+) diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index fec2e9754aed..5b3fa2cbe722 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -125,6 +125,7 @@ EXPORT_SYMBOL_GPL(ahci_shost_attrs); struct device_attribute *ahci_sdev_attrs[] = { &dev_attr_sw_activity, &dev_attr_unload_heads, + &dev_attr_ncq_prio_supported, &dev_attr_ncq_prio_enable, NULL }; diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c index dc397ebda089..5566fd4bb38f 100644 --- a/drivers/ata/libata-sata.c +++ b/drivers/ata/libata-sata.c @@ -834,6 +834,30 @@ DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR, ata_scsi_lpm_show, ata_scsi_lpm_store); EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy); +static ssize_t ata_ncq_prio_supported_show(struct device *device, + struct device_attribute *attr, + char *buf) +{ + struct scsi_device *sdev = to_scsi_device(device); + struct ata_port *ap = ata_shost_to_port(sdev->host); + struct ata_device *dev; + bool ncq_prio_supported; + int rc = 0; + + spin_lock_irq(ap->lock); + dev = ata_scsi_find_dev(ap, sdev); + if (!dev) + rc = -ENODEV; + else + ncq_prio_supported = dev->flags & ATA_DFLAG_NCQ_PRIO; + spin_unlock_irq(ap->lock); + + return rc ? rc : sysfs_emit(buf, "%u\n", ncq_prio_supported); +} + +DEVICE_ATTR(ncq_prio_supported, S_IRUGO, ata_ncq_prio_supported_show, NULL); +EXPORT_SYMBOL_GPL(dev_attr_ncq_prio_supported); + static ssize_t ata_ncq_prio_enable_show(struct device *device, struct device_attribute *attr, char *buf) diff --git a/include/linux/libata.h b/include/linux/libata.h index b23f28cfc8e0..a2d1bae7900b 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -539,6 +539,7 @@ typedef void (*ata_postreset_fn_t)(struct ata_link *link, unsigned int *classes) extern struct device_attribute dev_attr_unload_heads; #ifdef CONFIG_SATA_HOST extern struct device_attribute dev_attr_link_power_management_policy; +extern struct device_attribute dev_attr_ncq_prio_supported; extern struct device_attribute dev_attr_ncq_prio_enable; extern struct device_attribute dev_attr_em_message_type; extern struct device_attribute dev_attr_em_message;