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 X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DB149C43219 for ; Thu, 9 Sep 2021 12:39:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C76086120F for ; Thu, 9 Sep 2021 12:39:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1354687AbhIIMjP (ORCPT ); Thu, 9 Sep 2021 08:39:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:38686 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353660AbhIIM3P (ORCPT ); Thu, 9 Sep 2021 08:29:15 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 963866127C; Thu, 9 Sep 2021 11:52:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1631188345; bh=jaWhB30kYM7WYMY8wYo7ZrTkUv2CIFZbGtHtR7noM1s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vIKmPekPdITbT6IetQW5k0arIyNbak4gAsmxwkcfX6gOsHkJo/4ZUOMr4o/utLFQr HICBUJNVPgyB/7bhE+CI/PwjvaZN7rFeYobJnId0GCbzrsbXZHiiL7kgjkLat3dVHE fXgku3ZcITa7WJLAXlSLk8Y6goafpJq36Q8m+PTY4D1S2M+gARs5OxbBlMH1A0zez7 RxhJchuAPpJwckwCvpwmXBGQCusnkx7P8G4mTOaVmDdzW7nnoSeLogHlt61e1OucJO QtZT5vXt8boutwaG7J05DbNFE0PVHOij8lAFBvjSSHdJDS4x4TgVDjDIpAoukOxub3 vpMGBPEJQIgvA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Niklas Schnelle , Heiko Carstens , Sasha Levin , linux-s390@vger.kernel.org Subject: [PATCH AUTOSEL 5.10 052/176] s390: make PCI mio support a machine flag Date: Thu, 9 Sep 2021 07:49:14 -0400 Message-Id: <20210909115118.146181-52-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210909115118.146181-1-sashal@kernel.org> References: <20210909115118.146181-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Niklas Schnelle [ Upstream commit 3322ba0d7bea1e24ae464418626f6a15b69533ab ] Kernel support for the newer PCI mio instructions can be toggled off with the pci=nomio command line option which needs to integrate with common code PCI option parsing. However this option then toggles static branches which can't be toggled yet in an early_param() call. Thus commit 9964f396f1d0 ("s390: fix setting of mio addressing control") moved toggling the static branches to the PCI init routine. With this setup however we can't check for mio support outside the PCI code during early boot, i.e. before switching the static branches, which we need to be able to export this as an ELF HWCAP. Improve on this by turning mio availability into a machine flag that gets initially set based on CONFIG_PCI and the facility bit and gets toggled off if pci=nomio is found during PCI option parsing allowing simple access to this machine flag after early init. Reviewed-by: Heiko Carstens Signed-off-by: Niklas Schnelle Signed-off-by: Heiko Carstens Signed-off-by: Sasha Levin --- arch/s390/include/asm/setup.h | 2 ++ arch/s390/kernel/early.c | 4 ++++ arch/s390/pci/pci.c | 5 ++--- 3 files changed, 8 insertions(+), 3 deletions(-) diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h index bdb242a1544e..75a2ecec2ab8 100644 --- a/arch/s390/include/asm/setup.h +++ b/arch/s390/include/asm/setup.h @@ -38,6 +38,7 @@ #define MACHINE_FLAG_NX BIT(15) #define MACHINE_FLAG_GS BIT(16) #define MACHINE_FLAG_SCC BIT(17) +#define MACHINE_FLAG_PCI_MIO BIT(18) #define LPP_MAGIC BIT(31) #define LPP_PID_MASK _AC(0xffffffff, UL) @@ -113,6 +114,7 @@ extern unsigned long mio_wb_bit_mask; #define MACHINE_HAS_NX (S390_lowcore.machine_flags & MACHINE_FLAG_NX) #define MACHINE_HAS_GS (S390_lowcore.machine_flags & MACHINE_FLAG_GS) #define MACHINE_HAS_SCC (S390_lowcore.machine_flags & MACHINE_FLAG_SCC) +#define MACHINE_HAS_PCI_MIO (S390_lowcore.machine_flags & MACHINE_FLAG_PCI_MIO) /* * Console mode. Override with conmode= diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index 705844f73934..985e1e755333 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -238,6 +238,10 @@ static __init void detect_machine_facilities(void) clock_comparator_max = -1ULL >> 1; __ctl_set_bit(0, 53); } + if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) { + S390_lowcore.machine_flags |= MACHINE_FLAG_PCI_MIO; + /* the control bit is set during PCI initialization */ + } } static inline void save_vector_registers(void) diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c index ca1a105e3b5d..807589077739 100644 --- a/arch/s390/pci/pci.c +++ b/arch/s390/pci/pci.c @@ -865,7 +865,6 @@ static void zpci_mem_exit(void) } static unsigned int s390_pci_probe __initdata = 1; -static unsigned int s390_pci_no_mio __initdata; unsigned int s390_pci_force_floating __initdata; static unsigned int s390_pci_initialized; @@ -876,7 +875,7 @@ char * __init pcibios_setup(char *str) return NULL; } if (!strcmp(str, "nomio")) { - s390_pci_no_mio = 1; + S390_lowcore.machine_flags &= ~MACHINE_FLAG_PCI_MIO; return NULL; } if (!strcmp(str, "force_floating")) { @@ -905,7 +904,7 @@ static int __init pci_base_init(void) if (!test_facility(69) || !test_facility(71)) return 0; - if (test_facility(153) && !s390_pci_no_mio) { + if (MACHINE_HAS_PCI_MIO) { static_branch_enable(&have_mio); ctl_set_bit(2, 5); } -- 2.30.2