From patchwork Mon Jul 10 16:47:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Naresh Solanki X-Patchwork-Id: 701305 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A9D5AEB64DA for ; Mon, 10 Jul 2023 16:47:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230375AbjGJQrQ (ORCPT ); Mon, 10 Jul 2023 12:47:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47160 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230227AbjGJQrQ (ORCPT ); Mon, 10 Jul 2023 12:47:16 -0400 Received: from mail-wm1-x334.google.com (mail-wm1-x334.google.com [IPv6:2a00:1450:4864:20::334]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 00B1312B for ; Mon, 10 Jul 2023 09:47:13 -0700 (PDT) Received: by mail-wm1-x334.google.com with SMTP id 5b1f17b1804b1-3fbf7fbe722so54859785e9.3 for ; Mon, 10 Jul 2023 09:47:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=9elements.com; s=google; t=1689007632; x=1691599632; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=v/t6qi+ZyC/g4PTUhHmZaN3Bd0vINMuJ9GK/6w6tG3Y=; b=V1OY1iakMDqwmTsPidEnik2bW4XQPEfQTlKGXnR6DntnWGM9nQ6OTH48seUGb92Z+U ijjbTIy/sx9vD90XypKgtbEF6jZaw+kcCltr/KrQzGnNrY5mf11v+YaLXgYJW21crfh5 LYRraPw94Ds60uV2jNH49ETwBrWE/f7bMy/ce326mc4LWHBQY3Jp0MXJyWVZSVk0wdyL noxFjfWKjKC1Mm4AMB2+g8cfadTsT09TgcBWslOQFz1Hv0oFF0k1oTaILGyWnN/YJRdI LkKF8/bZlQwa96jxM2Z5GbEohPyqpEMd2rptUrvgzrO73X4WR7pJCTjFnZZXANlDU6yT LFyg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689007632; x=1691599632; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=v/t6qi+ZyC/g4PTUhHmZaN3Bd0vINMuJ9GK/6w6tG3Y=; b=aLQtKXiKL85BUIkkkBz2w+byOQ9BMqThOaxx8BawGH7Q9apLjDOepESsf8t302sXVX AecFI8R6zhVvjHdn7BkIjYnCSbj78K4NU24n9YAh0Ih8beJqJfVJ6e9PCIiypdUszIWL 2a1pxqyRyHQtV+vqttVN+csRPifZuUEn1Cdkg7PgpfeYN6guGRzvzO53cf5YBQQ3G4yL TjbG3Azub6njN8nZh3QmQ0NgXt9Bb3nsshNaGbA3/mBUE07/CTx+UrpTOKLMBULqh1l9 PV00cAvH1HmPGGC7xLTCqfwDif+mm1eQmt026PclsWlP1d7bXP2vY177ELBcUXNe6FVl T+5g== X-Gm-Message-State: ABy/qLbAxujYVTqMFm4RA0G1RB2pKwrVezwy7J85XTn4vOC1l6X/WcZ2 nv4IhiiCMWeZheNof28qUW0YLbs33DZ421gBbh/odA== X-Google-Smtp-Source: APBJJlE7AnlZK1RZo5W0XD+eszpl4R8XQAZAgpYb4pdp/gmgV/vbap7e6x7nIqCaMoyNeSDIomMr/w== X-Received: by 2002:a7b:ce18:0:b0:3fb:b280:f548 with SMTP id m24-20020a7bce18000000b003fbb280f548mr16210018wmc.0.1689007631860; Mon, 10 Jul 2023 09:47:11 -0700 (PDT) Received: from stroh80.sec.9e.network (ip-078-094-000-051.um19.pools.vodafone-ip.de. [78.94.0.51]) by smtp.gmail.com with ESMTPSA id n2-20020a05600c294200b003fbe791a0e8sm394704wmd.0.2023.07.10.09.47.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Jul 2023 09:47:11 -0700 (PDT) From: Naresh Solanki X-Google-Original-From: Naresh Solanki To: devicetree@vger.kernel.org, Guenter Roeck , Jean Delvare , Iwona Winiarska Cc: linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, Patrick Rudolph Subject: [PATCH 1/2] hwmon: (dimmtemp) Support more than 32 DIMMs Date: Mon, 10 Jul 2023 18:47:03 +0200 Message-ID: <20230710164705.3985996-1-Naresh.Solanki@9elements.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Patrick Rudolph This patch introduces support for handling more than 32 DIMMs by utilizing bitmap operations. The changes ensure that the driver can handle a higher number of DIMMs efficiently. Signed-off-by: Patrick Rudolph --- drivers/hwmon/peci/dimmtemp.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-) base-commit: 4dbbaf8fbdbd13adc80731b2452257857e4c2d8b diff --git a/drivers/hwmon/peci/dimmtemp.c b/drivers/hwmon/peci/dimmtemp.c index ed968401f93c..ce89da3937a0 100644 --- a/drivers/hwmon/peci/dimmtemp.c +++ b/drivers/hwmon/peci/dimmtemp.c @@ -219,19 +219,21 @@ static int check_populated_dimms(struct peci_dimmtemp *priv) { int chan_rank_max = priv->gen_info->chan_rank_max; int dimm_idx_max = priv->gen_info->dimm_idx_max; - u32 chan_rank_empty = 0; - u32 dimm_mask = 0; - int chan_rank, dimm_idx, ret; + DECLARE_BITMAP(dimm_mask, DIMM_NUMS_MAX); + DECLARE_BITMAP(chan_rank_empty, CHAN_RANK_MAX); + + int chan_rank, dimm_idx, ret, i; u32 pcs; - BUILD_BUG_ON(BITS_PER_TYPE(chan_rank_empty) < CHAN_RANK_MAX); - BUILD_BUG_ON(BITS_PER_TYPE(dimm_mask) < DIMM_NUMS_MAX); if (chan_rank_max * dimm_idx_max > DIMM_NUMS_MAX) { WARN_ONCE(1, "Unsupported number of DIMMs - chan_rank_max: %d, dimm_idx_max: %d", chan_rank_max, dimm_idx_max); return -EINVAL; } + bitmap_zero(dimm_mask, DIMM_NUMS_MAX); + bitmap_zero(chan_rank_empty, CHAN_RANK_MAX); + for (chan_rank = 0; chan_rank < chan_rank_max; chan_rank++) { ret = peci_pcs_read(priv->peci_dev, PECI_PCS_DDR_DIMM_TEMP, chan_rank, &pcs); if (ret) { @@ -242,7 +244,7 @@ static int check_populated_dimms(struct peci_dimmtemp *priv) * detection to be performed at a later point in time. */ if (ret == -EINVAL) { - chan_rank_empty |= BIT(chan_rank); + bitmap_set(chan_rank_empty, chan_rank, 1); continue; } @@ -251,7 +253,7 @@ static int check_populated_dimms(struct peci_dimmtemp *priv) for (dimm_idx = 0; dimm_idx < dimm_idx_max; dimm_idx++) if (__dimm_temp(pcs, dimm_idx)) - dimm_mask |= BIT(chan_rank * dimm_idx_max + dimm_idx); + bitmap_set(dimm_mask, chan_rank * dimm_idx_max + dimm_idx, 1); } /* @@ -260,7 +262,7 @@ static int check_populated_dimms(struct peci_dimmtemp *priv) * host platform boot. Retrying a couple of times lets us make sure * that the state is persistent. */ - if (chan_rank_empty == GENMASK(chan_rank_max - 1, 0)) { + if (bitmap_full(chan_rank_empty, chan_rank_max)) { if (priv->no_dimm_retry_count < NO_DIMM_RETRY_COUNT_MAX) { priv->no_dimm_retry_count++; @@ -274,14 +276,16 @@ static int check_populated_dimms(struct peci_dimmtemp *priv) * It's possible that memory training is not done yet. In this case we * defer the detection to be performed at a later point in time. */ - if (!dimm_mask) { + if (bitmap_empty(dimm_mask, DIMM_NUMS_MAX)) { priv->no_dimm_retry_count = 0; return -EAGAIN; } - dev_dbg(priv->dev, "Scanned populated DIMMs: %#x\n", dimm_mask); + for_each_set_bit(i, dimm_mask, DIMM_NUMS_MAX) { + dev_dbg(priv->dev, "Found DIMM%#x\n", i); + } - bitmap_from_arr32(priv->dimm_mask, &dimm_mask, DIMM_NUMS_MAX); + bitmap_copy(priv->dimm_mask, dimm_mask, DIMM_NUMS_MAX); return 0; }