From patchwork Thu May 15 21:19:50 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mario Limonciello X-Patchwork-Id: 890512 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 9E98E29DB69; Thu, 15 May 2025 21:20:24 +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=1747344024; cv=none; b=EfheTduqp+q5JYnMnWn5wFhJIET5b969pNjCk6zVkMAyVAfApdBCihaxGFFZKBizGkOHLdVvVTIWnpLkhEjISjjUsF/kTrypU48vmtGU5IccFxAQx7j7tRjwOVkJ7CPzHOUIvFKrfA0OVwfFogmregxwjVxQefOm9ktmmTyC2zA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747344024; c=relaxed/simple; bh=ccxi92/CdYcFz5SRXc75fcFWq7DUZRAtA96LadU0vMs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=my4P3RsIETlE7AO9sxP80OQOkhLWv/5gxSVO3VyWDjKgESVddb8LSbFGLAR+t+3dUXwbaYYCzOmQpVeiDEPUGuch2i++NrBlZWws2ZU//kceGyfqdZyG6r3oSOvlDIftz01sFMcQt9OBYGE1ZXVy8nJcg4AL957O+EZEPCaZwzw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=GOZTCYE1; 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="GOZTCYE1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C90BEC4CEE7; Thu, 15 May 2025 21:20:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1747344024; bh=ccxi92/CdYcFz5SRXc75fcFWq7DUZRAtA96LadU0vMs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GOZTCYE1AfYxSnTPuiMx3EDc6y/a2uA5klS8tlrZUT+kTUswdV2mpHwHq2PtgCZ2D beD2/4FeQp06ZQGtEqdbeuWVZ+ZMTrBW5jJiaMuEgixFX5CPKyBQt1anoB+RaBO7yN 0B39LvVbQ25TALtekJjBCIGICa8Q0xb9G801WX9SEWofhEgbPlPN2jMMfPrGl3U+Fz Xu3Y3HBREIsStb/Eu4Z1ZmQQdoneTyPpd3glVAQzHIYAP6Xe7hIWsqpUoe/Fb0Prfu JiJDWPTpLQvmVxenU7fFJqIE/z6JwYfdWzEkxLzURnyRL9Y75xkm2OCFrVUxCBVqlc RLRGWTk2EeeLg== From: Mario Limonciello To: =?utf-8?q?Ilpo_J=C3=A4rvinen?= Cc: Mario Limonciello , Perry Yuan , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)), "H . Peter Anvin" , Jonathan Corbet , Huang Rui , "Gautham R . Shenoy" , "Rafael J . Wysocki" , Viresh Kumar , platform-driver-x86@vger.kernel.org (open list:AMD HETERO CORE HARDWARE FEEDBACK DRIVER), linux-kernel@vger.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)), linux-doc@vger.kernel.org (open list:DOCUMENTATION), linux-pm@vger.kernel.org (open list:AMD PSTATE DRIVER) Subject: [PATCH v10 13/13] x86/itmt: Add debugfs file to show core priorities Date: Thu, 15 May 2025 16:19:50 -0500 Message-ID: <20250515211950.3102922-14-superm1@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250515211950.3102922-1-superm1@kernel.org> References: <20250515211950.3102922-1-superm1@kernel.org> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Mario Limonciello Multiple drivers can report priorities to ITMT. To aid in debugging any issues with the values reported by drivers introduce a debugfs file to read out the values. Signed-off-by: Mario Limonciello --- arch/x86/kernel/itmt.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/arch/x86/kernel/itmt.c b/arch/x86/kernel/itmt.c index 9cea1fc36c18f..243a769fdd97b 100644 --- a/arch/x86/kernel/itmt.c +++ b/arch/x86/kernel/itmt.c @@ -59,6 +59,18 @@ static ssize_t sched_itmt_enabled_write(struct file *filp, return result; } +static int sched_core_priority_show(struct seq_file *s, void *unused) +{ + int cpu; + + seq_puts(s, "CPU #\tPriority\n"); + for_each_possible_cpu(cpu) + seq_printf(s, "%d\t%d\n", cpu, arch_asym_cpu_priority(cpu)); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(sched_core_priority); + static const struct file_operations dfs_sched_itmt_fops = { .read = debugfs_read_file_bool, .write = sched_itmt_enabled_write, @@ -67,6 +79,7 @@ static const struct file_operations dfs_sched_itmt_fops = { }; static struct dentry *dfs_sched_itmt; +static struct dentry *dfs_sched_core_prio; /** * sched_set_itmt_support() - Indicate platform supports ITMT @@ -102,6 +115,14 @@ int sched_set_itmt_support(void) return -ENOMEM; } + dfs_sched_core_prio = debugfs_create_file("sched_core_priority", 0644, + arch_debugfs_dir, NULL, + &sched_core_priority_fops); + if (IS_ERR_OR_NULL(dfs_sched_core_prio)) { + dfs_sched_core_prio = NULL; + return -ENOMEM; + } + sched_itmt_capable = true; sysctl_sched_itmt_enabled = 1; @@ -133,6 +154,8 @@ void sched_clear_itmt_support(void) debugfs_remove(dfs_sched_itmt); dfs_sched_itmt = NULL; + debugfs_remove(dfs_sched_core_prio); + dfs_sched_core_prio = NULL; if (sysctl_sched_itmt_enabled) { /* disable sched_itmt if we are no longer ITMT capable */