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 EC765C43458 for ; Fri, 10 Jul 2026 14:45:56 +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=K3Tmq1m0/VpLbVxQwHnhSg1P4sueEusoJ24AznkMEN0=; b=j023YGOslYdpDwii/Jy0UfdJzg yysAOnnqoVKFwAreauVS17fPuiS4k66MIki0YkxGP4AupgAowzRnwclDHJ9itNW9a+yOZpzwejzpX EyWaJiVCV9KYlL59Af8w3B4x7LRGTNNNAoKUN1cLw4TPCLhf44K4WAO12SaeD7oHeVAC4p97je6So V6/7S7xMIr9T6eVoAQwBitwA2mrG0vq45FD5rKC4jXfOCt0GItJJ902hHasHP67skhJWE+uMQPWm+ 8D41Ym9KPiKRDh1clwmjejTvlSgNucnUOVXhiiqFY70rLYV0Ms9Kwr15RQT/TuIro6K7Qzhjyowbt GrlEJQEA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wiCU6-000000056iE-3PjM; Fri, 10 Jul 2026 14:45:46 +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 1wiCU4-000000056gy-1tEv for linux-arm-kernel@lists.infradead.org; Fri, 10 Jul 2026 14:45:45 +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 F41E41BC0; Fri, 10 Jul 2026 07:45:38 -0700 (PDT) Received: from e142021.munich.arm.com (e142021.arm.com [10.41.150.148]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 54FCE3F7B4; Fri, 10 Jul 2026 07:45:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1783694743; bh=6OlvW+eQ2GaznRaP8rXR5TDcvHWDz1dS7H74bnFx2nQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=p1EdBmwKIzR9Aqe49t7set5L0KE+U/nIc2FBlEzULKQLlFoAbWQcOCDALqhJtfZZY FtO/b8sGj45lK2kRifdhFifBwLG85Lc+d4BbVRz2eYAhHpapCKZ58Ij92laZxOzrfw 5sAsSqWEjHiyLUbYA2A5owhrUyIxSvcM8eByQn0k= 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 , linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 03/16] arm_mpam: propagate MSC read errors for hw_probe functions Date: Fri, 10 Jul 2026 16:45:07 +0200 Message-ID: <20260710144520.917375-4-andre.przywara@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260710144520.917375-1-andre.przywara@arm.com> References: <20260710144520.917375-1-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-20260710_074544_573303_F71C6456 X-CRM114-Status: GOOD ( 14.49 ) 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 functions probing for MSC hardware and features to return an error, and propagate read errors from the lower level up. Signed-off-by: Andre Przywara --- drivers/resctrl/mpam_devices.c | 70 ++++++++++++++++++++++++---------- 1 file changed, 50 insertions(+), 20 deletions(-) diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c index 8fd2c38c821c..b1bd047da203 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -785,7 +785,7 @@ static void mpam_enable_quirks(struct mpam_msc *msc) static bool mpam_ris_hw_probe_csu_nrdy(struct mpam_msc_ris *ris) { u32 now, mon_sel, ctl_val; - bool can_set, can_clear; + bool can_set, can_clear, ret = false; struct mpam_msc *msc = ris->vmsc->msc; if (WARN_ON_ONCE(!mpam_mon_sel_lock(msc))) @@ -804,20 +804,26 @@ static bool mpam_ris_hw_probe_csu_nrdy(struct mpam_msc_ris *ris) mpam_write_monsel_reg(msc, CFG_CSU_CTL, ctl_val); _mpam_write_monsel_reg(msc, MSMON_CSU, MSMON___NRDY); - _mpam_read_monsel_reg(msc, MSMON_CSU, &now); + if (_mpam_read_monsel_reg(msc, MSMON_CSU, &now)) + goto out_unlock; can_set = now & MSMON___NRDY; _mpam_write_monsel_reg(msc, MSMON_CSU, 0); /* Configuration change to try and coax hardware into setting nrdy */ mpam_write_monsel_reg(msc, CFG_CSU_FLT, 0x1); - _mpam_read_monsel_reg(msc, MSMON_CSU, &now); + if (_mpam_read_monsel_reg(msc, MSMON_CSU, &now)) + goto out_unlock; can_clear = !(now & MSMON___NRDY); + + ret = !can_set || !can_clear; + +out_unlock: mpam_mon_sel_unlock(msc); - return (!can_set || !can_clear); + return ret; } -static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) +static int mpam_ris_hw_probe(struct mpam_msc_ris *ris) { int err; struct mpam_msc *msc = ris->vmsc->msc; @@ -832,7 +838,9 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) if (FIELD_GET(MPAMF_IDR_HAS_CCAP_PART, ris->idr)) { u32 ccap_features; - mpam_read_partsel_reg(msc, CCAP_IDR, &ccap_features); + err = mpam_read_partsel_reg(msc, CCAP_IDR, &ccap_features); + if (err) + return err; props->cmax_wd = FIELD_GET(MPAMF_CCAP_IDR_CMAX_WD, ccap_features); if (props->cmax_wd && @@ -857,7 +865,9 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) if (FIELD_GET(MPAMF_IDR_HAS_CPOR_PART, ris->idr)) { u32 cpor_features; - mpam_read_partsel_reg(msc, CPOR_IDR, &cpor_features); + err = mpam_read_partsel_reg(msc, CPOR_IDR, &cpor_features); + if (err) + return err; props->cpbm_wd = FIELD_GET(MPAMF_CPOR_IDR_CPBM_WD, cpor_features); if (props->cpbm_wd) @@ -867,8 +877,9 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) /* Memory bandwidth partitioning */ if (FIELD_GET(MPAMF_IDR_HAS_MBW_PART, ris->idr)) { u32 mbw_features; - - mpam_read_partsel_reg(msc, MBW_IDR, &mbw_features); + err = mpam_read_partsel_reg(msc, MBW_IDR, &mbw_features); + if (err) + return err; /* portion bitmap resolution */ props->mbw_pbm_bits = FIELD_GET(MPAMF_MBW_IDR_BWPBM_WD, mbw_features); @@ -897,8 +908,9 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) /* Priority partitioning */ if (FIELD_GET(MPAMF_IDR_HAS_PRI_PART, ris->idr)) { u32 pri_features; - - mpam_read_partsel_reg(msc, PRI_IDR, &pri_features); + err = mpam_read_partsel_reg(msc, PRI_IDR, &pri_features); + if (err) + return err; props->intpri_wd = FIELD_GET(MPAMF_PRI_IDR_INTPRI_WD, pri_features); if (props->intpri_wd && FIELD_GET(MPAMF_PRI_IDR_HAS_INTPRI, pri_features)) { @@ -919,7 +931,9 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) if (FIELD_GET(MPAMF_IDR_HAS_MSMON, ris->idr)) { u32 msmon_features; - mpam_read_partsel_reg(msc, MSMON_IDR, &msmon_features); + err = mpam_read_partsel_reg(msc, MSMON_IDR, &msmon_features); + if (err) + return err; /* * If the firmware max-nrdy-us property is missing, the @@ -932,7 +946,9 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) if (FIELD_GET(MPAMF_MSMON_IDR_MSMON_CSU, msmon_features)) { u32 csumonidr; - mpam_read_partsel_reg(msc, CSUMON_IDR, &csumonidr); + err = mpam_read_partsel_reg(msc, CSUMON_IDR, &csumonidr); + if (err) + return err; props->num_csu_mon = FIELD_GET(MPAMF_CSUMON_IDR_NUM_MON, csumonidr); if (props->num_csu_mon) { @@ -958,7 +974,9 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) bool has_long; u32 mbwumon_idr; - mpam_read_partsel_reg(msc, MBWUMON_IDR, &mbwumon_idr); + err = mpam_read_partsel_reg(msc, MBWUMON_IDR, &mbwumon_idr); + if (err) + return err; props->num_mbwu_mon = FIELD_GET(MPAMF_MBWUMON_IDR_NUM_MON, mbwumon_idr); if (props->num_mbwu_mon) { @@ -991,16 +1009,22 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) u16 partid_max; u32 nrwidr; - mpam_read_partsel_reg(msc, PARTID_NRW_IDR, &nrwidr); + err = mpam_read_partsel_reg(msc, PARTID_NRW_IDR, &nrwidr); + if (err) + return err; + partid_max = FIELD_GET(MPAMF_PARTID_NRW_IDR_INTPARTID_MAX, nrwidr); mpam_set_feature(mpam_feat_partid_nrw, props); msc->partid_max = min(msc->partid_max, partid_max); } + + return 0; } static int mpam_msc_hw_probe(struct mpam_msc *msc) { + int ret; u64 idr; u16 partid_max; u8 ris_idx, pmg_max; @@ -1016,10 +1040,12 @@ static int mpam_msc_hw_probe(struct mpam_msc *msc) /* Grab an IDR value to find out how many RIS there are */ mutex_lock(&msc->part_sel_lock); - mpam_msc_read_idr(msc, &idr); - mpam_read_partsel_reg(msc, IIDR, &msc->iidr); - + ret = mpam_msc_read_idr(msc, &idr); + if (!ret) + ret = mpam_read_partsel_reg(msc, IIDR, &msc->iidr); mutex_unlock(&msc->part_sel_lock); + if (ret) + return ret; mpam_enable_quirks(msc); @@ -1032,8 +1058,10 @@ static int mpam_msc_hw_probe(struct mpam_msc *msc) for (ris_idx = 0; ris_idx <= msc->ris_max; ris_idx++) { mutex_lock(&msc->part_sel_lock); __mpam_part_sel(ris_idx, 0, msc); - mpam_msc_read_idr(msc, &idr); + ret = mpam_msc_read_idr(msc, &idr); mutex_unlock(&msc->part_sel_lock); + if (ret) + return ret; partid_max = FIELD_GET(MPAMF_IDR_PARTID_MAX, idr); pmg_max = FIELD_GET(MPAMF_IDR_PMG_MAX, idr); @@ -1050,8 +1078,10 @@ static int mpam_msc_hw_probe(struct mpam_msc *msc) mutex_lock(&msc->part_sel_lock); __mpam_part_sel(ris_idx, 0, msc); - mpam_ris_hw_probe(ris); + ret = mpam_ris_hw_probe(ris); mutex_unlock(&msc->part_sel_lock); + if (ret) + return ret; } /* Clear any stale errors */ -- 2.43.0