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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 32208C433EF for ; Tue, 14 Sep 2021 21:36:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1B73061213 for ; Tue, 14 Sep 2021 21:36:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235074AbhINVhf (ORCPT ); Tue, 14 Sep 2021 17:37:35 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:2920 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S234925AbhINVhc (ORCPT ); Tue, 14 Sep 2021 17:37:32 -0400 Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.1.2/8.16.0.43) with SMTP id 18EKxjHS031888; Tue, 14 Sep 2021 17:35:47 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=5Gh8S5FvyeFMEokeXe/PXEHPNy8luH1zsbM4fj9ZU3A=; b=DnlGIc9ko8xL234QqmcMaiHWsFGp7wOFKc1m4X7ij7UwtVjze7yOWjc8e8u4x8IOyTJm qFE8sAyKVczuUhB6/K/t84Ocme0yaldllBygY2lB9RBm2ZNpyQoceV4L5QgyhnxHf1qR cS1THxxd+Z2y313FYRnbupYFZq2eAEfsxElsRpwhKylGS/lAG+fl7NIohii8KuL0f861 RgVZ80u/wCgU+yHAEqqSz8lbSxQw+7kKRb2ouD/tWc+pl8mnr+nwEq7o04CCcv15Ujy9 lgBoAkUKXGF6rU5+18JmUr9yOig1KijF9iKnfOuRdDymxmNBbq5tbv3LYbozYPOjjOlV yw== Received: from ppma01wdc.us.ibm.com (fd.55.37a9.ip4.static.sl-reverse.com [169.55.85.253]) by mx0b-001b2d01.pphosted.com with ESMTP id 3b31gqu8ym-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 14 Sep 2021 17:35:47 -0400 Received: from pps.filterd (ppma01wdc.us.ibm.com [127.0.0.1]) by ppma01wdc.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 18ELRrc7009216; Tue, 14 Sep 2021 21:35:46 GMT Received: from b03cxnp08025.gho.boulder.ibm.com (b03cxnp08025.gho.boulder.ibm.com [9.17.130.17]) by ppma01wdc.us.ibm.com with ESMTP id 3b0m39u5bd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 14 Sep 2021 21:35:46 +0000 Received: from b03ledav002.gho.boulder.ibm.com (b03ledav002.gho.boulder.ibm.com [9.17.130.233]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 18ELZjc053346582 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 14 Sep 2021 21:35:45 GMT Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 19D04136055; Tue, 14 Sep 2021 21:35:45 +0000 (GMT) Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A0629136066; Tue, 14 Sep 2021 21:35:44 +0000 (GMT) Received: from v0005c16.aus.stglabs.ibm.com (unknown [9.211.154.14]) by b03ledav002.gho.boulder.ibm.com (Postfix) with ESMTP; Tue, 14 Sep 2021 21:35:44 +0000 (GMT) From: Eddie James To: linux-fsi@lists.ozlabs.org Cc: linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org, joel@jms.id.au, linux@roeck-us.net, jdelvare@suse.com, alistair@popple.id.au, jk@ozlabs.org, eajames@linux.ibm.com Subject: [PATCH 1/3] fsi: occ: Use a large buffer for responses Date: Tue, 14 Sep 2021 16:35:41 -0500 Message-Id: <20210914213543.73351-2-eajames@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210914213543.73351-1-eajames@linux.ibm.com> References: <20210914213543.73351-1-eajames@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: hhDr9h_lhj4ZP24QFKNzkl7dr4RoXEj- X-Proofpoint-ORIG-GUID: hhDr9h_lhj4ZP24QFKNzkl7dr4RoXEj- X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.687,Hydra:6.0.235,FMLib:17.0.607.475 definitions=2020-10-13_15,2020-10-13_02,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 clxscore=1011 spamscore=0 bulkscore=0 impostorscore=0 malwarescore=0 suspectscore=0 mlxscore=0 lowpriorityscore=0 mlxlogscore=999 priorityscore=1501 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2109030001 definitions=main-2109140100 Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org Allocate a large buffer for each OCC to handle response data. This removes memory allocation during an operation, and also allows for the maximum amount of SBE FFDC. Signed-off-by: Eddie James --- drivers/fsi/fsi-occ.c | 109 ++++++++++++++++------------------------ include/linux/fsi-occ.h | 2 + 2 files changed, 45 insertions(+), 66 deletions(-) diff --git a/drivers/fsi/fsi-occ.c b/drivers/fsi/fsi-occ.c index b0c9322078a1..ace3ec7767e5 100644 --- a/drivers/fsi/fsi-occ.c +++ b/drivers/fsi/fsi-occ.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -42,13 +43,6 @@ #define OCC_P10_SRAM_MODE 0x58 /* Normal mode, OCB channel 2 */ -/* - * Assume we don't have much FFDC, if we do we'll overflow and - * fail the command. This needs to be big enough for simple - * commands as well. - */ -#define OCC_SBE_STATUS_WORDS 32 - #define OCC_TIMEOUT_MS 1000 #define OCC_CMD_IN_PRG_WAIT_MS 50 @@ -60,6 +54,7 @@ struct occ { char name[32]; int idx; u8 sequence_number; + void *buffer; enum versions version; struct miscdevice mdev; struct mutex occ_lock; @@ -250,8 +245,10 @@ static int occ_verify_checksum(struct occ *occ, struct occ_response *resp, static int occ_getsram(struct occ *occ, u32 offset, void *data, ssize_t len) { u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */ - size_t cmd_len, resp_len, resp_data_len; - __be32 *resp, cmd[6]; + size_t cmd_len, resp_data_len; + size_t resp_len = OCC_MAX_RESP_WORDS; + __be32 *resp = occ->buffer; + __be32 cmd[6]; int idx = 0, rc; /* @@ -278,19 +275,19 @@ static int occ_getsram(struct occ *occ, u32 offset, void *data, ssize_t len) cmd[1] = cpu_to_be32(SBEFIFO_CMD_GET_OCC_SRAM); cmd[4 + idx] = cpu_to_be32(data_len); - resp_len = (data_len >> 2) + OCC_SBE_STATUS_WORDS; - resp = kzalloc(resp_len << 2, GFP_KERNEL); - if (!resp) - return -ENOMEM; - rc = sbefifo_submit(occ->sbefifo, cmd, cmd_len, resp, &resp_len); if (rc) - goto free; + return rc; rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_GET_OCC_SRAM, resp, resp_len, &resp_len); - if (rc) - goto free; + if (rc > 0) { + dev_err(occ->dev, "SRAM read returned failure status: %08x\n", + rc); + return -EBADMSG; + } else if (rc) { + return rc; + } resp_data_len = be32_to_cpu(resp[resp_len - 1]); if (resp_data_len != data_len) { @@ -301,39 +298,21 @@ static int occ_getsram(struct occ *occ, u32 offset, void *data, ssize_t len) memcpy(data, resp, len); } -free: - /* Convert positive SBEI status */ - if (rc > 0) { - dev_err(occ->dev, "SRAM read returned failure status: %08x\n", - rc); - rc = -EBADMSG; - } - - kfree(resp); return rc; } static int occ_putsram(struct occ *occ, const void *data, ssize_t len, u8 seq_no, u16 checksum) { - size_t cmd_len, buf_len, resp_len, resp_data_len; u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */ - __be32 *buf; + size_t cmd_len, resp_data_len; + size_t resp_len = OCC_MAX_RESP_WORDS; + __be32 *buf = occ->buffer; u8 *byte_buf; int idx = 0, rc; cmd_len = (occ->version == occ_p10) ? 6 : 5; - - /* - * We use the same buffer for command and response, make - * sure it's big enough - */ - resp_len = OCC_SBE_STATUS_WORDS; cmd_len += data_len >> 2; - buf_len = max(cmd_len, resp_len); - buf = kzalloc(buf_len << 2, GFP_KERNEL); - if (!buf) - return -ENOMEM; /* * Magic sequence to do SBE putsram command. SBE will transfer @@ -384,12 +363,17 @@ static int occ_putsram(struct occ *occ, const void *data, ssize_t len, rc = sbefifo_submit(occ->sbefifo, buf, cmd_len, buf, &resp_len); if (rc) - goto free; + return rc; rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_PUT_OCC_SRAM, buf, resp_len, &resp_len); - if (rc) - goto free; + if (rc > 0) { + dev_err(occ->dev, "SRAM write returned failure status: %08x\n", + rc); + return -EBADMSG; + } else if (rc) { + return rc; + } if (resp_len != 1) { dev_err(occ->dev, "SRAM write response length invalid: %zd\n", @@ -405,27 +389,16 @@ static int occ_putsram(struct occ *occ, const void *data, ssize_t len, } } -free: - /* Convert positive SBEI status */ - if (rc > 0) { - dev_err(occ->dev, "SRAM write returned failure status: %08x\n", - rc); - rc = -EBADMSG; - } - - kfree(buf); return rc; } static int occ_trigger_attn(struct occ *occ) { - __be32 buf[OCC_SBE_STATUS_WORDS]; - size_t cmd_len, resp_len, resp_data_len; + __be32 *buf = occ->buffer; + size_t cmd_len, resp_data_len; + size_t resp_len = OCC_MAX_RESP_WORDS; int idx = 0, rc; - BUILD_BUG_ON(OCC_SBE_STATUS_WORDS < 8); - resp_len = OCC_SBE_STATUS_WORDS; - switch (occ->version) { default: case occ_p9: @@ -450,12 +423,17 @@ static int occ_trigger_attn(struct occ *occ) rc = sbefifo_submit(occ->sbefifo, buf, cmd_len, buf, &resp_len); if (rc) - goto error; + return rc; rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_PUT_OCC_SRAM, buf, resp_len, &resp_len); - if (rc) - goto error; + if (rc > 0) { + dev_err(occ->dev, "SRAM attn returned failure status: %08x\n", + rc); + return -EBADMSG; + } else if (rc) { + return rc; + } if (resp_len != 1) { dev_err(occ->dev, "SRAM attn response length invalid: %zd\n", @@ -471,14 +449,6 @@ static int occ_trigger_attn(struct occ *occ) } } - error: - /* Convert positive SBEI status */ - if (rc > 0) { - dev_err(occ->dev, "SRAM attn returned failure status: %08x\n", - rc); - rc = -EBADMSG; - } - return rc; } @@ -635,6 +605,10 @@ static int occ_probe(struct platform_device *pdev) if (!occ) return -ENOMEM; + occ->buffer = kvmalloc(OCC_MAX_RESP_WORDS * 4, GFP_KERNEL); + if (!occ->buffer) + return -ENOMEM; + occ->version = (enum versions)md; occ->dev = dev; occ->sbefifo = dev->parent; @@ -670,6 +644,7 @@ static int occ_probe(struct platform_device *pdev) if (rc) { dev_err(dev, "failed to register miscdevice: %d\n", rc); ida_simple_remove(&occ_ida, occ->idx); + kvfree(occ->buffer); return rc; } @@ -685,6 +660,8 @@ static int occ_remove(struct platform_device *pdev) { struct occ *occ = platform_get_drvdata(pdev); + kvfree(occ->buffer); + misc_deregister(&occ->mdev); device_for_each_child(&pdev->dev, NULL, occ_unregister_child); diff --git a/include/linux/fsi-occ.h b/include/linux/fsi-occ.h index d4cdc2aa6e33..7ee3dbd7f4b3 100644 --- a/include/linux/fsi-occ.h +++ b/include/linux/fsi-occ.h @@ -19,6 +19,8 @@ struct device; #define OCC_RESP_CRIT_OCB 0xE3 #define OCC_RESP_CRIT_HW 0xE4 +#define OCC_MAX_RESP_WORDS 2048 + int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, void *response, size_t *resp_len); -- 2.27.0