From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 51EA4311C0C for ; Tue, 2 Dec 2025 12:21:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764678114; cv=none; b=KYMtvnswKL1/SI4ESLQDOKQSSME9VM4vkjH9tGpiv3IY35GKftpz1kuW1M0n2fjOiVFZnJjCCINgtaKa26YUQ328nAZLnKg/YMdOK4FV9wTm4K0Yke55ttzeNj5AgbaSgJD4phKP0UxubiMxLgcTC5ryJIJZJWSy/47JIK0RITk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764678114; c=relaxed/simple; bh=rljK0o3LVNSrCiOwh/95t+pSRgIw9p8+scXodj7lYiY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rk0B5tCO1jZ6VzetKmk1ZK+5r7W+U74JFlHK/1PdSIYbqJo2mlDhMMQHxNneUKxbb7eq49OM2mbE2Jr2fOj63kIc60DUq7YW6nCxylW65COfe8q2fG04RjXqzK5SqtlJrybiEo/yaGlKaAbBAZNo6FATkEV2Uh9bZE9c1+agogM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hYVniH7C; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hYVniH7C" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B915BC4CEF1; Tue, 2 Dec 2025 12:21:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1764678113; bh=rljK0o3LVNSrCiOwh/95t+pSRgIw9p8+scXodj7lYiY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hYVniH7Cn+5Oq2/GG35vq7ChiH3uX88TVeiTH4CEQ0sPjQz81Cyh1d90/UdM8vtPf iK6EQ/WuTyE23OmGMHyPy1BQfNfMEsEJHeGp9XLN2R16XCTt84HB8ZFb2M4FPPG/7S qq91f6szv5ssc8Huj5v4fwrzU9VSHAZbJDwYgEf4ubGC2IhzEl44sjztzT2NZkfFXU BzAzEHyK//TbqMyJvaOvSilAhBRO8YNab8Jxk21OPFKPBoBoMsPNsPhjCe6FrRm+LV Xh1DIjnCyUG+VqsJqyHKnCTbzXJ9ejLH3jK7Q+B7fmNTFHH3QycIyBOKd7U4Phr/iN ND4MyHZp6vFLg== From: Niklas Cassel To: Damien Le Moal Cc: linux-ide@vger.kernel.org, "Martin K. Petersen" , Niklas Cassel Subject: [PATCH v4 5/6] ata: libata: Add libata.force parameter max_sec Date: Tue, 2 Dec 2025 13:21:35 +0100 Message-ID: <20251202122129.421783-13-cassel@kernel.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251202122129.421783-8-cassel@kernel.org> References: <20251202122129.421783-8-cassel@kernel.org> Precedence: bulk X-Mailing-List: linux-ide@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2071; i=cassel@kernel.org; h=from:subject; bh=rljK0o3LVNSrCiOwh/95t+pSRgIw9p8+scXodj7lYiY=; b=owGbwMvMwCV2MsVw8cxjvkWMp9WSGDL1bp7bNvttb/qkf1kN+1dYCK5b+Nx1R8gh1b/T058cW P/Q0E3mXkcpC4MYF4OsmCKL7w+X/cXd7lOOK96xgZnDygQyhIGLUwAmMv04I8OyDcdnb79bwP6p 596S5KVXRdjy3d+v13ycJ63hclRqok4vI8Pk9Nu2z69YaHaafPPsZtXd05gcznbuwx7uFT0eIae KXjIDAA== X-Developer-Key: i=cassel@kernel.org; a=openpgp; fpr=5ADE635C0E631CBBD5BE065A352FE6582ED9B5DA Content-Transfer-Encoding: 8bit Add a new libata.force parameter called max_sec. The parameter can take an arbitrary value using the format: libata.force=max_sec= e.g. libata.force=max_sec=8191 or libata.force=max_sec=2048 This will allow the user to set an arbitrary maximum command size (dev->max_sectors) using libata.force. We cannot remove the existing libata.force parameters "max_sec_128" and "max_sec_1024", as these are a part of the exising user facing API. Signed-off-by: Niklas Cassel Reviewed-by: Martin K. Petersen Reviewed-by: Damien Le Moal --- Documentation/admin-guide/kernel-parameters.txt | 5 +++++ drivers/ata/libata-core.c | 1 + 2 files changed, 6 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 6c42061ca20e5..e47113cbd2fcc 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3294,6 +3294,11 @@ * [no]logdir: Enable or disable access to the general purpose log directory. + * max_sec=: Set the transfer size limit, in + number of 512-byte sectors, to the value specified in + . The value specified in has to be + a non-zero positive integer. + * max_sec_128: Set transfer size limit to 128 sectors. * max_sec_1024: Set or clear transfer size limit to diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 9a8da530e123a..2905aceba7038 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -6536,6 +6536,7 @@ static const struct ata_force_param force_tbl[] __initconst = { force_quirk_val(max_sec_128, ATA_QUIRK_MAX_SEC, 128), force_quirk_val(max_sec_1024, ATA_QUIRK_MAX_SEC, 1024), + force_quirk_on(max_sec=, ATA_QUIRK_MAX_SEC), force_quirk_on(max_sec_lba48, ATA_QUIRK_MAX_SEC_LBA48), force_quirk_onoff(lpm, ATA_QUIRK_NOLPM), -- 2.52.0