From patchwork Thu Sep 22 13:37:55 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Rui X-Patchwork-Id: 12985123 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 420F6C6FA86 for ; Thu, 22 Sep 2022 13:35:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231580AbiIVNfY (ORCPT ); Thu, 22 Sep 2022 09:35:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34958 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231574AbiIVNfT (ORCPT ); Thu, 22 Sep 2022 09:35:19 -0400 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2E4DE87086; Thu, 22 Sep 2022 06:35:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1663853710; x=1695389710; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=izKx2i2YnCzZigJqPxNJZEiqz/oZMoOAlgtG1yN62lw=; b=PohLzI8KXtS8aX/xNh0RTpCAfdiQ4l5r3Q5tn5CLEfTLxLtigExxHJH7 OuiUnWIgerui+TVN0zKld8pEJ2xp7KAzGWdq9sV5ItnFWHHXDtkRtszdA ZZ8ux94UUwnlFwpMoGuw1r0axjXx78jB0YlZK0K4GzcC0PU4QefG0YXod nFT4VKvsQ62gA63D2wE2yfxVz9oh0OiQmElAqPrE9/kMj7Fpzw7JRUp8o Wfi8tRUZ88u/xeJL2igk4D9G2QRbFIg4GqptW3diou05pkXqByFz7FXaU UmGJ95wIi3Nx6eMw+vqnF3H+PA2ANfpJq7S5fS8326520xJNvEHYV9NSo g==; X-IronPort-AV: E=McAfee;i="6500,9779,10478"; a="297894128" X-IronPort-AV: E=Sophos;i="5.93,335,1654585200"; d="scan'208";a="297894128" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Sep 2022 06:35:09 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.93,335,1654585200"; d="scan'208";a="619793884" Received: from power-sh.sh.intel.com ([10.239.183.122]) by orsmga002.jf.intel.com with ESMTP; 22 Sep 2022 06:35:05 -0700 From: Zhang Rui To: linux-kernel@vger.kernel.org, x86@kernel.org, linux-hwmon@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, peterz@infradead.org, corbet@lwn.net, fenghua.yu@intel.com, jdelvare@suse.com, linux@roeck-us.net, len.brown@intel.com, rui.zhang@intel.com Subject: [PATCH V3 3/8] hwmon/coretemp: Handle large core ID value Date: Thu, 22 Sep 2022 21:37:55 +0800 Message-Id: <20220922133800.12918-4-rui.zhang@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220922133800.12918-1-rui.zhang@intel.com> References: <20220922133800.12918-1-rui.zhang@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org The coretemp driver supports up to a hard-coded limit of 128 cores. Today, the driver can not support a core with an ID above that limit. Yet, the encoding of core ID's is arbitrary (BIOS APIC-ID) and so they may be sparse and they may be large. Update the driver to map arbitrary core ID numbers into appropriate array indexes so that 128 cores can be supported, no matter the encoding of core ID's. Acked-by: Len Brown Signed-off-by: Zhang Rui Acked-by: Guenter Roeck --- drivers/hwmon/coretemp.c | 56 +++++++++++++++++++++++++++++----------- 1 file changed, 41 insertions(+), 15 deletions(-) diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c index bfdcfe8ccb34..291566aeb703 100644 --- a/drivers/hwmon/coretemp.c +++ b/drivers/hwmon/coretemp.c @@ -46,9 +46,6 @@ MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius"); #define TOTAL_ATTRS (MAX_CORE_ATTRS + 1) #define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO) -#define TO_CORE_ID(cpu) (cpu_data(cpu).cpu_core_id) -#define TO_ATTR_NO(cpu) (TO_CORE_ID(cpu) + BASE_SYSFS_ATTR_NO) - #ifdef CONFIG_SMP #define for_each_sibling(i, cpu) \ for_each_cpu(i, topology_sibling_cpumask(cpu)) @@ -91,6 +88,8 @@ struct temp_data { struct platform_data { struct device *hwmon_dev; u16 pkg_id; + u16 cpu_map[NUM_REAL_CORES]; + struct ida ida; struct cpumask cpumask; struct temp_data *core_data[MAX_CORE_DATA]; struct device_attribute name_attr; @@ -441,7 +440,7 @@ static struct temp_data *init_temp_data(unsigned int cpu, int pkg_flag) MSR_IA32_THERM_STATUS; tdata->is_pkg_data = pkg_flag; tdata->cpu = cpu; - tdata->cpu_core_id = TO_CORE_ID(cpu); + tdata->cpu_core_id = topology_core_id(cpu); tdata->attr_size = MAX_CORE_ATTRS; mutex_init(&tdata->update_lock); return tdata; @@ -454,7 +453,7 @@ static int create_core_data(struct platform_device *pdev, unsigned int cpu, struct platform_data *pdata = platform_get_drvdata(pdev); struct cpuinfo_x86 *c = &cpu_data(cpu); u32 eax, edx; - int err, attr_no; + int err, index, attr_no; /* * Find attr number for sysfs: @@ -462,14 +461,26 @@ static int create_core_data(struct platform_device *pdev, unsigned int cpu, * The attr number is always core id + 2 * The Pkgtemp will always show up as temp1_*, if available */ - attr_no = pkg_flag ? PKG_SYSFS_ATTR_NO : TO_ATTR_NO(cpu); + if (pkg_flag) { + attr_no = PKG_SYSFS_ATTR_NO; + } else { + index = ida_alloc(&pdata->ida, GFP_KERNEL); + if (index < 0) + return index; + pdata->cpu_map[index] = topology_core_id(cpu); + attr_no = index + BASE_SYSFS_ATTR_NO; + } - if (attr_no > MAX_CORE_DATA - 1) - return -ERANGE; + if (attr_no > MAX_CORE_DATA - 1) { + err = -ERANGE; + goto ida_free; + } tdata = init_temp_data(cpu, pkg_flag); - if (!tdata) - return -ENOMEM; + if (!tdata) { + err = -ENOMEM; + goto ida_free; + } /* Test if we can access the status register */ err = rdmsr_safe_on_cpu(cpu, tdata->status_reg, &eax, &edx); @@ -505,6 +516,9 @@ static int create_core_data(struct platform_device *pdev, unsigned int cpu, exit_free: pdata->core_data[attr_no] = NULL; kfree(tdata); +ida_free: + if (!pkg_flag) + ida_free(&pdata->ida, index); return err; } @@ -524,6 +538,9 @@ static void coretemp_remove_core(struct platform_data *pdata, int index) kfree(pdata->core_data[index]); pdata->core_data[index] = NULL; + + if (index >= BASE_SYSFS_ATTR_NO) + ida_free(&pdata->ida, index - BASE_SYSFS_ATTR_NO); } static int coretemp_probe(struct platform_device *pdev) @@ -537,6 +554,7 @@ static int coretemp_probe(struct platform_device *pdev) return -ENOMEM; pdata->pkg_id = pdev->id; + ida_init(&pdata->ida); platform_set_drvdata(pdev, pdata); pdata->hwmon_dev = devm_hwmon_device_register_with_groups(dev, DRVNAME, @@ -553,6 +571,7 @@ static int coretemp_remove(struct platform_device *pdev) if (pdata->core_data[i]) coretemp_remove_core(pdata, i); + ida_destroy(&pdata->ida); return 0; } @@ -647,7 +666,7 @@ static int coretemp_cpu_offline(unsigned int cpu) struct platform_device *pdev = coretemp_get_pdev(cpu); struct platform_data *pd; struct temp_data *tdata; - int index, target; + int i, index = -1, target; /* * Don't execute this on suspend as the device remove locks @@ -660,12 +679,19 @@ static int coretemp_cpu_offline(unsigned int cpu) if (!pdev) return 0; - /* The core id is too big, just return */ - index = TO_ATTR_NO(cpu); - if (index > MAX_CORE_DATA - 1) + pd = platform_get_drvdata(pdev); + + for (i = 0; i < NUM_REAL_CORES; i++) { + if (pd->cpu_map[i] == topology_core_id(cpu)) { + index = i + BASE_SYSFS_ATTR_NO; + break; + } + } + + /* Too many cores and this core is not populated, just return */ + if (index < 0) return 0; - pd = platform_get_drvdata(pdev); tdata = pd->core_data[index]; cpumask_clear_cpu(cpu, &pd->cpumask);