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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7E2B3C98318 for ; Thu, 24 Sep 2026 15:28:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=BBPpQBHKrMOD/yPqfloATE7AC+AZPpDLsoNKc1UIZRc=; b=K6XldlOt/Z/5v1lKycC1p5Cpvy Aa/tC7ygejfI/5OoizrNXEjYYkeN9FV2YnJ31kGFalHS/0VV1c/Tr3NU9PiplBaaYJKaqMeGeUWeW sy6ILbLV03lKcWLQcC2OJRUXpKl7Fyu31+zelFKPYrOiF3fxQ/83U/j86XfBzdV3GpeQKOvFsL3Co OiVMHUFKk0GglymSqRW+m3IvZcCeyvfa23yEtA9CKM9Ws/x7TZa7TJECcE5mgmjrdQhEpWW/zUqCK 0ma6BcN2luUjK+o3Wz3ua/JEffLCyak99MMeAhXGX8xyeQozjbDvJi2xi0xnzmHulRRHpGP2stR/t DBcrTF5A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x9lNA-0000000BOn7-113U; Thu, 24 Sep 2026 15:28:32 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x9lN3-0000000BOhk-0joD for linux-arm-kernel@lists.infradead.org; Thu, 24 Sep 2026 15:28:26 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id CC2281BCB; Thu, 24 Sep 2026 08:28:20 -0700 (PDT) Received: from e142021.arm.com (unknown [10.57.8.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 68C353F86F; Thu, 24 Sep 2026 08:28:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1790263704; bh=lQbsP8ZSYvWNdPXsJJ7VCy9P00wz+YHxs5Fcq8+D5cQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=be9IttSswjCx8Pug0FCTESdp2JJ1tslvEH3ledEMydmp4SQBy5PwlyWOXH7leNjg9 kKsoRwtXk/cX2rV14K6aXObEkpcwB3JF14pA2sz+xEuNXqAuRruSS5+leqsC8OwYRI KCtBtrJpA3d2Kyjuat0zZZdwYeOvY9fFmDIHp5qI= From: Andre Przywara To: Lorenzo Pieralisi , Hanjun Guo , Sudeep Holla , Catalin Marinas , Will Deacon , "Rafael J . Wysocki" , Len Brown , James Morse , Ben Horgan , Reinette Chatre , Fenghua Yu Cc: Jonathan Cameron , Srivathsa L Rao , Ganapatrao Kulkarni , Trilok Soni , Srinivas Ramana , Niyas Sait , Lee Trager , Ritwick Sharma , Gavin Shan , linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v11 04/13] arm_mpam: propagate MSC access errors for msmon helpers Date: Thu, 24 Sep 2026 17:27:30 +0200 Message-ID: <20260924152739.2865510-5-andre.przywara@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260924152739.2865510-1-andre.przywara@arm.com> References: <20260924152739.2865510-1-andre.przywara@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260924_082825_340430_1B7B9D6A X-CRM114-Status: GOOD ( 12.18 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Allow the helper functions for msmon accesses to return an error, and propagate read and write errors from the lower level up. Signed-off-by: Andre Przywara Reviewed-by: Jonathan Cameron Reviewed-by: Ben Horgan Reviewed-by: Gavin Shan Tested-by: Gavin Shan # on NVIDIA Grace Hopper --- drivers/resctrl/mpam_devices.c | 72 ++++++++++++++++++++++------------ 1 file changed, 47 insertions(+), 25 deletions(-) diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c index f780bcc587c7a..bfad65596f172 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -1170,15 +1170,20 @@ static int mpam_msc_read_mbwu_l(struct mpam_msc *msc, u64 *res) return 0; } -static void mpam_msc_zero_mbwu_l(struct mpam_msc *msc) +static int mpam_msc_zero_mbwu_l(struct mpam_msc *msc) { + int ret; + mpam_mon_sel_lock_held(msc); WARN_ON_ONCE((MSMON_MBWU_L + sizeof(u64)) > msc->mapped_hwpage_sz); WARN_ON_ONCE(!cpumask_test_cpu(smp_processor_id(), &msc->accessibility)); - __mpam_write_reg(msc, MSMON_MBWU_L, 0); - __mpam_write_reg(msc, MSMON_MBWU_L + 4, 0); + ret = __mpam_write_reg(msc, MSMON_MBWU_L, 0); + if (ret) + return ret; + + return __mpam_write_reg(msc, MSMON_MBWU_L + 4, 0); } static void gen_msmon_ctl_flt_vals(struct mon_read *m, u32 *ctl_val, @@ -1221,24 +1226,28 @@ static void gen_msmon_ctl_flt_vals(struct mon_read *m, u32 *ctl_val, } } -static void read_msmon_ctl_flt_vals(struct mon_read *m, u32 *ctl_val, - u32 *flt_val) +static int read_msmon_ctl_flt_vals(struct mon_read *m, u32 *ctl_val, + u32 *flt_val) { struct mpam_msc *msc = m->ris->vmsc->msc; + int ret; switch (m->type) { case mpam_feat_msmon_csu: - mpam_read_monsel_reg(msc, CFG_CSU_CTL, ctl_val); - mpam_read_monsel_reg(msc, CFG_CSU_FLT, flt_val); - break; + ret = mpam_read_monsel_reg(msc, CFG_CSU_CTL, ctl_val); + if (ret) + return ret; + return mpam_read_monsel_reg(msc, CFG_CSU_FLT, flt_val); case mpam_feat_msmon_mbwu_31counter: case mpam_feat_msmon_mbwu_44counter: case mpam_feat_msmon_mbwu_63counter: - mpam_read_monsel_reg(msc, CFG_MBWU_CTL, ctl_val); - mpam_read_monsel_reg(msc, CFG_MBWU_FLT, flt_val); - break; + ret = mpam_read_monsel_reg(msc, CFG_MBWU_CTL, ctl_val); + if (ret) + return ret; + return mpam_read_monsel_reg(msc, CFG_MBWU_FLT, flt_val); default: pr_warn("Unexpected monitor type %d\n", m->type); + return -EINVAL; } } @@ -1251,10 +1260,11 @@ static inline void clean_msmon_ctl_val(u32 *cur_ctl) *cur_ctl &= ~MSMON_CFG_MBWU_CTL_OFLOW_STATUS_L; } -static void write_msmon_ctl_flt_vals(struct mon_read *m, u32 ctl_val, - u32 flt_val) +static int write_msmon_ctl_flt_vals(struct mon_read *m, u32 ctl_val, + u32 flt_val) { struct mpam_msc *msc = m->ris->vmsc->msc; + int ret; /* * Write the ctl_val with the enable bit cleared, reset the counter, @@ -1262,25 +1272,37 @@ static void write_msmon_ctl_flt_vals(struct mon_read *m, u32 ctl_val, */ switch (m->type) { case mpam_feat_msmon_csu: - mpam_write_monsel_reg(msc, CFG_CSU_FLT, flt_val); - mpam_write_monsel_reg(msc, CFG_CSU_CTL, ctl_val); - mpam_write_monsel_reg(msc, CSU, 0); - mpam_write_monsel_reg(msc, CFG_CSU_CTL, ctl_val | MSMON_CFG_x_CTL_EN); - break; + ret = mpam_write_monsel_reg(msc, CFG_CSU_FLT, flt_val); + if (ret) + return ret; + ret = mpam_write_monsel_reg(msc, CFG_CSU_CTL, ctl_val); + if (ret) + return ret; + ret = mpam_write_monsel_reg(msc, CSU, 0); + if (ret) + return ret; + return mpam_write_monsel_reg(msc, CFG_CSU_CTL, ctl_val | MSMON_CFG_x_CTL_EN); case mpam_feat_msmon_mbwu_31counter: case mpam_feat_msmon_mbwu_44counter: case mpam_feat_msmon_mbwu_63counter: - mpam_write_monsel_reg(msc, CFG_MBWU_FLT, flt_val); - mpam_write_monsel_reg(msc, CFG_MBWU_CTL, ctl_val); - mpam_write_monsel_reg(msc, CFG_MBWU_CTL, ctl_val | MSMON_CFG_x_CTL_EN); + ret = mpam_write_monsel_reg(msc, CFG_MBWU_FLT, flt_val); + if (ret) + return ret; + ret = mpam_write_monsel_reg(msc, CFG_MBWU_CTL, ctl_val); + if (ret) + return ret; + ret = mpam_write_monsel_reg(msc, CFG_MBWU_CTL, + ctl_val | MSMON_CFG_x_CTL_EN); + if (ret) + return ret; /* Counting monitors require NRDY to be reset by software */ if (m->type == mpam_feat_msmon_mbwu_31counter) - mpam_write_monsel_reg(msc, MBWU, 0); - else - mpam_msc_zero_mbwu_l(m->ris->vmsc->msc); - break; + return mpam_write_monsel_reg(msc, MBWU, 0); + + return mpam_msc_zero_mbwu_l(m->ris->vmsc->msc); default: pr_warn("Unexpected monitor type %d\n", m->type); + return -EINVAL; } } -- 2.43.0