From nobody Sat Oct 4 00:21:27 2025 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.14]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BB15F3126B6; Fri, 22 Aug 2025 14:56:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.14 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755874588; cv=none; b=ufwjt/Xe1XMhr9jdF3l8vX49nhlDn8ojHKgTmbN9B98rYUhqCT05HsVVs5Gor1EKIdnmR4aS8DNR1OHGouYDe1q1QtATZZbU/XbYpu2MDr0d+XQ4DIVk0HyKKM7ULzditAwUv81DgOnI3xN+IGVpVVEA7TU0e6zjnsjxqDITuXo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755874588; c=relaxed/simple; bh=x5WvhX4O8xfwMKYkjxN13ooXO03C+az2T3Yal0pKgnU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=AEt7cnqStQY3ULmOAWQjoeldvT4gKoXbXdbfYvWcT7iugZVCxyhXc5BdCNQQ1TMsdiuyuj2IuZPTyBH+RAqoWm8SbhdIXSd4pnbM1VwFaLSVzzXwJRLQB7qQAdCsr2cRQt6KIvmmyGpnlthpbLUxiB+/cwRIJQKzeOa6qYUmmXs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=U6jabSQ/; arc=none smtp.client-ip=198.175.65.14 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="U6jabSQ/" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1755874587; x=1787410587; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=x5WvhX4O8xfwMKYkjxN13ooXO03C+az2T3Yal0pKgnU=; b=U6jabSQ/xIydUyZnlKHC5iKUIqDl1FRvpV7bkE8nW/B2ta2Zlolmzw7F kS+pv9V67Vu5fOZzHPbcjyZgVLnbC7XDlMtCbqPiVAw+LvM/ulsFsTk7A ukundmK1XZ0LAecegGcJyw0V5BJqbPIJAxatQfwBkYXwtcIYfFzRVcrR2 KzxDagZDWVQxjI4jeQ4Gs//NfYHHroS/1swrS9FGM1SU8kQ669ml4Gzax 0RDM/hO608xFPcwKaEURiEjVT8cNprOANWnhtfDCREsOse/h5qoZa8K0F QzK/J/khWaZWu63ba7oeZdaphdDtKehIHi5abOZUtwfacEtuhIMjwoQ3s g==; X-CSE-ConnectionGUID: cgFgg7F9QZmnQA/gumBr2w== X-CSE-MsgGUID: 2axb+LHZSqqg9Das9lvB4A== X-IronPort-AV: E=McAfee;i="6800,10657,11529"; a="62015713" X-IronPort-AV: E=Sophos;i="6.17,309,1747724400"; d="scan'208";a="62015713" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Aug 2025 07:56:26 -0700 X-CSE-ConnectionGUID: 0i+eI+8LQqmInl7HncQ8ZQ== X-CSE-MsgGUID: YUBpK2JcQ7ytQJraYVvkOw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.17,309,1747724400"; d="scan'208";a="173994430" Received: from ijarvine-mobl1.ger.corp.intel.com (HELO localhost) ([10.245.244.115]) by fmviesa004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Aug 2025 07:56:21 -0700 From: =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= To: Andreas Larsson , Bjorn Helgaas , "David S. Miller" , Geert Uytterhoeven , linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-pci@vger.kernel.org, sparclinux@vger.kernel.org, Thomas Bogendoerfer , =?UTF-8?q?Christian=20K=C3=B6nig?= , Yinghai Lu , Igor Mammedov , "Rafael J . Wysocki" , Jonathan Cameron , Lorenzo Pieralisi , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , linux-kernel@vger.kernel.org Cc: =?UTF-8?q?Micha=C5=82=20Winiarski?= , linuxppc-dev@lists.ozlabs.org, =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= Subject: [PATCH 01/24] m68k/PCI: Use pci_enable_resources() in pcibios_enable_device() Date: Fri, 22 Aug 2025 17:55:42 +0300 Message-Id: <20250822145605.18172-2-ilpo.jarvinen@linux.intel.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250822145605.18172-1-ilpo.jarvinen@linux.intel.com> References: <20250822145605.18172-1-ilpo.jarvinen@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable m68k has a resource enable (check) loop in its pcibios_enable_device() which for some reason differs from pci_enable_resources(). This could lead to inconsistencies in behavior, especially now as pci_enable_resources() and the bridge window resource flags behavior are going to be altered by upcoming changes. The check for !r->start && r->end is already covered by the more generic checks done in pci_enable_resources(). The entire pcibios_enable_device() suspiciously looks copy-paste from some other arch as also indicated by the preceding comment. However, it also enables PCI_COMMAND_IO | PCI_COMMAND_MEMORY always for bridges, it is not clear why that is being done as the commit e93a6bbeb5a5 ("m68k: common PCI support definitions and code") introducing this code states: "Nothing specific to any PCI implementation in any m68k class CPU hardware yet". Replace the resource enable loop with a call to pci_enable_resources() and adjust the Command Register afterwards as it's unclear if that is necessary or not so keep it for now. Signed-off-by: Ilpo J=C3=A4rvinen --- arch/m68k/kernel/pcibios.c | 39 +++++++++++--------------------------- 1 file changed, 11 insertions(+), 28 deletions(-) diff --git a/arch/m68k/kernel/pcibios.c b/arch/m68k/kernel/pcibios.c index 9504eb19d73a..e6ab3f9ff5d8 100644 --- a/arch/m68k/kernel/pcibios.c +++ b/arch/m68k/kernel/pcibios.c @@ -44,41 +44,24 @@ resource_size_t pcibios_align_resource(void *data, cons= t struct resource *res, */ int pcibios_enable_device(struct pci_dev *dev, int mask) { - struct resource *r; u16 cmd, newcmd; - int idx; + int ret; =20 - pci_read_config_word(dev, PCI_COMMAND, &cmd); - newcmd =3D cmd; - - for (idx =3D 0; idx < 6; idx++) { - /* Only set up the requested stuff */ - if (!(mask & (1 << idx))) - continue; - - r =3D dev->resource + idx; - if (!r->start && r->end) { - pr_err("PCI: Device %s not available because of resource collisions\n", - pci_name(dev)); - return -EINVAL; - } - if (r->flags & IORESOURCE_IO) - newcmd |=3D PCI_COMMAND_IO; - if (r->flags & IORESOURCE_MEM) - newcmd |=3D PCI_COMMAND_MEMORY; - } + ret =3D pci_enable_resources(dev, mask); + if (ret < 0) + return ret; =20 /* * Bridges (eg, cardbus bridges) need to be fully enabled */ - if ((dev->class >> 16) =3D=3D PCI_BASE_CLASS_BRIDGE) + if ((dev->class >> 16) =3D=3D PCI_BASE_CLASS_BRIDGE) { + pci_read_config_word(dev, PCI_COMMAND, &cmd); newcmd |=3D PCI_COMMAND_IO | PCI_COMMAND_MEMORY; - - - if (newcmd !=3D cmd) { - pr_info("PCI: enabling device %s (0x%04x -> 0x%04x)\n", - pci_name(dev), cmd, newcmd); - pci_write_config_word(dev, PCI_COMMAND, newcmd); + if (newcmd !=3D cmd) { + pr_info("PCI: enabling bridge %s (0x%04x -> 0x%04x)\n", + pci_name(dev), cmd, newcmd); + pci_write_config_word(dev, PCI_COMMAND, newcmd); + } } return 0; } --=20 2.39.5