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 8812BC531F8 for ; Thu, 23 Jul 2026 15:55:32 +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=MhsjYymLULojgcy8xBqilkMzn8zcdVhJ8q6FrYOZJjc=; b=nlbwVhySSfJ/KvOY0L5uaAHKeD AM4CdWvLyQU4RoZzuoIu3ea2TARUc55BZbdOQ8RX9EymbmlNGj0gtjvcBJkj6+pug+mzRMct8fBmh Cgh/zBPPshQz9e77zrk6ElycR4OzE1N1bki5FngpaDPu1vUWU/5S5dPId0bcHLV8d0pqMcQb4oK37 0DZ/f5ZFFmnZ4YsX3JKAZWlL1uQV0uTOXlQl+rQR+mPiLNduxQrWCz+SPLfRnnQWzfzDFZeDZag8d LVhh6nMTkQLwAPCdAN7m16QXrkqc/H9fTMTwu24gelL+pAA2ob8qehtGD6Gw3rGCrg8/WyzHsMnB7 DBR7W7GA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wmvlS-0000000EeOU-2va6; Thu, 23 Jul 2026 15:55:14 +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 1wmvlN-0000000EeN4-2QGR for linux-arm-kernel@lists.infradead.org; Thu, 23 Jul 2026 15:55:10 +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 B8E88176A; Thu, 23 Jul 2026 08:55:03 -0700 (PDT) Received: from e142021.fritz.box (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 7A0EF3F66F; Thu, 23 Jul 2026 08:55:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1784822107; bh=s63AvJmH/yDk+84LzQBoFp+Px3O8XOz1/Jdu0R3WFpw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oMgftY9wNxOOZAd+wlaOWj5JV6E5aUNpBnzPtDfM25o1wHUnAbrURdlc9neNasWWT 1ooxui0Y2I6PvZXku/3HIB1NxpRD1zc379AkydCnkG0YXVpeiNP/EXPwPpgYMViFeo cjBP+Xu8fM4JX+zLBdGxHxIWjYZEOGlTSyDzMIZw= 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 , linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 02/10] arm_mpam: propagate MSC access errors for hw_probe functions Date: Thu, 23 Jul 2026 17:54:46 +0200 Message-ID: <20260723155454.1760823-3-andre.przywara@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260723155454.1760823-1-andre.przywara@arm.com> References: <20260723155454.1760823-1-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-20260723_085509_719028_2AD23344 X-CRM114-Status: GOOD ( 18.62 ) 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 and write errors from the lower level up. This uses some "scoped cleanup" functions like scoped_guard() and ACQUIRE() to avoid the complexity of error handling when a lock has been taken. Since the mon_sel_lock is a bit special (even more so in an upcoming patch), we define a new GUARD type for it. Signed-off-by: Andre Przywara --- drivers/resctrl/mpam_devices.c | 127 +++++++++++++++++++++----------- drivers/resctrl/mpam_internal.h | 8 ++ 2 files changed, 91 insertions(+), 44 deletions(-) diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c index 912c21ce7f9f..ecd45a585942 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -794,38 +794,46 @@ static bool mpam_ris_hw_probe_csu_nrdy(struct mpam_msc_ris *ris) bool can_set, can_clear; struct mpam_msc *msc = ris->vmsc->msc; - if (WARN_ON_ONCE(!mpam_mon_sel_lock(msc))) + ACQUIRE(mon_sel_lock, guard)(msc); + if (ACQUIRE_ERR(mon_sel_lock, &guard)) return false; mon_sel = FIELD_PREP(MSMON_CFG_MON_SEL_MON_SEL, 0) | FIELD_PREP(MSMON_CFG_MON_SEL_RIS, ris->ris_idx); - mpam_write_monsel_reg(msc, CFG_MON_SEL, mon_sel); + if (mpam_write_monsel_reg(msc, CFG_MON_SEL, mon_sel)) + return false; /* Hardware might ignore nrdy if it's not enabled */ ctl_val = MSMON_CFG_CSU_CTL_TYPE_CSU; ctl_val |= MSMON_CFG_x_CTL_MATCH_PARTID; ctl_val |= MSMON_CFG_x_CTL_MATCH_PMG; ctl_val |= MSMON_CFG_x_CTL_EN; - mpam_write_monsel_reg(msc, CFG_CSU_FLT, 0); - mpam_write_monsel_reg(msc, CFG_CSU_CTL, ctl_val); + if (mpam_write_monsel_reg(msc, CFG_CSU_FLT, 0)) + return false; + if (mpam_write_monsel_reg(msc, CFG_CSU_CTL, ctl_val)) + return false; - _mpam_write_monsel_reg(msc, MSMON_CSU, MSMON___NRDY); - _mpam_read_monsel_reg(msc, MSMON_CSU, &now); + if (_mpam_write_monsel_reg(msc, MSMON_CSU, MSMON___NRDY)) + return false; + if (_mpam_read_monsel_reg(msc, MSMON_CSU, &now)) + return false; can_set = now & MSMON___NRDY; - _mpam_write_monsel_reg(msc, MSMON_CSU, 0); + if (_mpam_write_monsel_reg(msc, MSMON_CSU, 0)) + return false; /* 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_write_monsel_reg(msc, CFG_CSU_FLT, 0x1)) + return false; + if (_mpam_read_monsel_reg(msc, MSMON_CSU, &now)) + return false; can_clear = !(now & MSMON___NRDY); - mpam_mon_sel_unlock(msc); return (!can_set || !can_clear); } -static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) +static int mpam_ris_hw_probe(struct mpam_msc_ris *ris) { - int err; + int fw_has_nrdy_err, err; struct mpam_msc *msc = ris->vmsc->msc; struct device *dev = &msc->pdev->dev; struct mpam_props *props = &ris->props; @@ -838,7 +846,9 @@ 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 && @@ -863,7 +873,9 @@ 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) @@ -873,8 +885,9 @@ 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); @@ -903,8 +916,9 @@ 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)) { @@ -925,20 +939,24 @@ 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 * CSU counters can't be used. Should we wait forever? */ - err = device_property_read_u32(&msc->pdev->dev, - "arm,not-ready-us", - &msc->nrdy_usec); + fw_has_nrdy_err = device_property_read_u32(&msc->pdev->dev, + "arm,not-ready-us", + &msc->nrdy_usec); 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) { @@ -956,7 +974,7 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) * Accept the missing firmware property if NRDY appears * un-implemented. */ - if (err && hw_managed) + if (fw_has_nrdy_err && hw_managed) dev_err_once(dev, "Counters are not usable because not-ready timeout was not provided by firmware."); } } @@ -964,7 +982,9 @@ 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) { @@ -997,16 +1017,22 @@ 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; @@ -1021,11 +1047,14 @@ 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); - - mutex_unlock(&msc->part_sel_lock); + scoped_guard(mutex, &msc->part_sel_lock) { + ret = mpam_msc_read_idr(msc, &idr); + if (ret) + return ret; + ret = mpam_read_partsel_reg(msc, IIDR, &msc->iidr); + if (ret) + return ret; + } mpam_enable_quirks(msc); @@ -1036,10 +1065,15 @@ static int mpam_msc_hw_probe(struct mpam_msc *msc) msc->pmg_max = FIELD_GET(MPAMF_IDR_PMG_MAX, idr); 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); - mutex_unlock(&msc->part_sel_lock); + scoped_guard(mutex, &msc->part_sel_lock) { + ret = __mpam_part_sel(ris_idx, 0, msc); + if (ret) + return ret; + + ret = mpam_msc_read_idr(msc, &idr); + if (ret) + return ret; + } partid_max = FIELD_GET(MPAMF_IDR_PARTID_MAX, idr); pmg_max = FIELD_GET(MPAMF_IDR_PMG_MAX, idr); @@ -1047,17 +1081,22 @@ static int mpam_msc_hw_probe(struct mpam_msc *msc) msc->pmg_max = min(msc->pmg_max, pmg_max); msc->has_extd_esr = FIELD_GET(MPAMF_IDR_HAS_EXTD_ESR, idr); - mutex_lock(&mpam_list_lock); - ris = mpam_get_or_create_ris(msc, ris_idx); - mutex_unlock(&mpam_list_lock); - if (IS_ERR(ris)) - return PTR_ERR(ris); + scoped_guard(mutex, &mpam_list_lock) { + ris = mpam_get_or_create_ris(msc, ris_idx); + if (IS_ERR(ris)) + return PTR_ERR(ris); + } ris->idr = idr; - mutex_lock(&msc->part_sel_lock); - __mpam_part_sel(ris_idx, 0, msc); - mpam_ris_hw_probe(ris); - mutex_unlock(&msc->part_sel_lock); + scoped_guard(mutex, &msc->part_sel_lock) { + ret = __mpam_part_sel(ris_idx, 0, msc); + if (ret) + return ret; + + ret = mpam_ris_hw_probe(ris); + if (ret) + return ret; + } } /* Clear any stale errors */ diff --git a/drivers/resctrl/mpam_internal.h b/drivers/resctrl/mpam_internal.h index 04d1a59f02af..0c3f6a040b20 100644 --- a/drivers/resctrl/mpam_internal.h +++ b/drivers/resctrl/mpam_internal.h @@ -162,6 +162,14 @@ static inline void mpam_mon_sel_lock_init(struct mpam_msc *msc) raw_spin_lock_init(&msc->_mon_sel_lock); } +DEFINE_GUARD(mon_sel, + struct mpam_msc *, + mpam_mon_sel_lock(_T), + mpam_mon_sel_unlock(_T)); +DEFINE_GUARD_COND(mon_sel, _lock, + mpam_mon_sel_lock(_T), + _RET); + /* Bits for mpam features bitmaps */ enum mpam_device_features { mpam_feat_cpor_part, -- 2.43.0