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 17AA7CA5FD4 for ; Fri, 2 Oct 2026 17:40:13 +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=8OL5DGdAs1Ke1xYHYGgjRzxbCwv3AJAqnhCVyHXFumc=; b=3kXQHd4mFnBqSbiQdFnGMCWPuF MXN2ZAiVzgR9JeuWPrcJUWi/pYqeDSJT5hWWWY00/2HPzXRYibAaPF2rkIOfgFmx0pBhsjGWGhg9f dB6qrhck8OIhHZLcWm7bn6NSfNq9n+/lUgV7NX9HuY68sp4IUWbIIZpVodNEp3RTudXGmgiw2V8IY iVsafiE/xc9XB7nuB2QOwW54E8a6ae+Q77AqD94EGnXvvKfLHFP6ov4YNQomL/UaPlS6KeRNeGuxy hTkPTi61SZhileTBlYZf5TT8DqFtMEClAMdn5ubusB+g06dEj/Y22Z3uCQ9Tq+zOiK7DWkS976htR +aKYIENw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xChEs-0000000CBFR-37wE; Fri, 02 Oct 2026 17:40:06 +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 1xChEq-0000000CBDJ-0nYe for linux-arm-kernel@lists.infradead.org; Fri, 02 Oct 2026 17:40:05 +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 AED80169C; Fri, 2 Oct 2026 10:39:59 -0700 (PDT) Received: from eglon.cambridge.arm.com (eglon.cambridge.arm.com [10.2.212.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 0F6933F85F; Fri, 2 Oct 2026 10:40:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1790962803; bh=EUu2gZsSkEPrYy1r3ulTWkIvXCtJuUzIRzKsZX65mqE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Qkg+crjmn0QXhIW0gN7Cp748KV1vyZpeCLX8Rv61rxBWDdk0aStbLkx+fZyqScW3r 6vdTzk+77fmRn7T7lZ+qXlPJXKLme+AXB9Nd0bCduBsoIF+CbJJVeXCdbGPVVTcyg/ VCOdrZFhzc5Z3G2VO+vr7PjdNc/oDZsb8ZiBOGZI= From: James Morse To: linux-arm-kernel@lists.infradead.org Cc: Catalin Marinas , Will Deacon , Ben Horgan , Andre Przywara , Fuad Tabba , Gavin Shan , James Morse Subject: [PATCH 02/27] arm_mpam: Restore the error interrupt enable from mpam_cpu_online() Date: Fri, 2 Oct 2026 18:39:15 +0100 Message-ID: <20261002173941.292319-3-james.morse@arm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261002173941.292319-1-james.morse@arm.com> References: <20261002173941.292319-1-james.morse@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-20261002_104004_299936_8105A793 X-CRM114-Status: GOOD ( 12.22 ) 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 From: Ben Horgan When all the associated CPUs to an MSC are offline, possibly caused by PSCI_CPU_OFF, the power supply to the MSC can be cut off and all the registers lose their value, including MPAMF_ECR.INTEN. Afterwards, we need to explicitly set MPAMF_ECR.INTEN when the first associated CPU becomes online and the power supply to the MSC is recovered. Restore MPAMF_ECR.INTEN in mpam_cpu_online() when the first associated CPU of the MSC becomes online. Fixes: 49aa621c4dca ("arm_mpam: Register and enable IRQs") Signed-off-by: Ben Horgan Tested-by: Gavin Shan Reviewed-by: Gavin Shan Reviewed-by: James Morse [morse: rephrased commit message] Signed-off-by: James Morse --- drivers/resctrl/mpam_devices.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c index 580d7ed38569..32bde94dfbc3 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -1856,8 +1856,14 @@ static int mpam_cpu_online(unsigned int cpu) if (msc->reenable_error_ppi) _enable_percpu_irq(&msc->reenable_error_ppi); - if (atomic_fetch_inc(&msc->online_refs) == 0) + if (atomic_fetch_inc(&msc->online_refs) == 0) { + mutex_lock(&msc->error_irq_lock); + if (msc->error_irq_hw_enabled) + mpam_touch_msc(msc, mpam_enable_msc_ecr, msc); + mutex_unlock(&msc->error_irq_lock); + mpam_reprogram_msc(msc); + } } if (mpam_resctrl_enabled) -- 2.53.0