From patchwork Wed Apr 23 13:10:58 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Grant Likely X-Patchwork-Id: 341840 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from ozlabs.org (localhost [127.0.0.1]) by ozlabs.org (Postfix) with ESMTP id 30B1A1401FA for ; Wed, 23 Apr 2014 23:11:51 +1000 (EST) Received: from mail-ee0-f54.google.com (mail-ee0-f54.google.com [74.125.83.54]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 8843C140124 for ; Wed, 23 Apr 2014 23:11:15 +1000 (EST) Received: by mail-ee0-f54.google.com with SMTP id d49so776354eek.13 for ; Wed, 23 Apr 2014 06:11:10 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:sender:from:subject:to:cc:in-reply-to:references :date:message-id; bh=oRuEB1kNeYloaKzMPP50UFLJrgW7dsFlp8z24vmeP+c=; b=LKxHOYSLmHunP/FGgZhymyRnllPoFgwBEcp5qgLwq9VgELwL4DjZ25G5WjE3jPyCPG oKNfs5HX9I1Y7NlowNNhXvkKyITaeX2zdn25fK23NON7ltDlKt6rBaYJh4TUs211f/ic aiN2jgl9ovJmAsN1yfmY4tKfs3z9/zcuyBNa1gn3iXayhyOF3biFeQxWWVBJ5AU2uKp5 hxvj7oF1D1HYiyKEMwhCCofIlGLrDNeAXW/+YR4eyuqQ5D+RGkMWY41Sw3SbHjW97xth yFnhDtpKAri7KF+2gE4YQcH86z3JsQQFELRL19zMlf5bRFxfn8rqn6qooyk5baDUZ3Hq 2IFw== X-Gm-Message-State: ALoCoQlrBrI2nUAOJueOhV/HbaTXN4fJU0PIDTFlkzKY0lcHtsu7Jptvpf1JrKvwhJSkDNF4v9Ui X-Received: by 10.14.47.12 with SMTP id s12mr3282730eeb.116.1398258670482; Wed, 23 Apr 2014 06:11:10 -0700 (PDT) Received: from trevor.secretlab.ca (host31-50-108-136.range31-50.btcentralplus.com. [31.50.108.136]) by mx.google.com with ESMTPSA id y7sm6211796eev.5.2014.04.23.06.11.08 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 23 Apr 2014 06:11:09 -0700 (PDT) Received: by trevor.secretlab.ca (Postfix, from userid 1000) id D94B6C408D2; Wed, 23 Apr 2014 15:10:58 +0200 (CEST) From: Grant Likely Subject: Re: [PATCH 3/3] of: Handle memory@0 node on PPC32 only To: Mark Rutland In-Reply-To: <20140423104528.GD30036@e106331-lin.cambridge.arm.com> References: <1397756521-29387-1-git-send-email-leif.lindholm@linaro.org> <1397756521-29387-4-git-send-email-leif.lindholm@linaro.org> <20140418125924.GF5904@bivouac.eciton.net> <20140422133515.E7A0BC40754@trevor.secretlab.ca> <20140423104528.GD30036@e106331-lin.cambridge.arm.com> Date: Wed, 23 Apr 2014 14:10:58 +0100 Message-Id: <20140423131058.D94B6C408D2@trevor.secretlab.ca> Cc: "devicetree@vger.kernel.org" , "patches@linaro.org" , Lee Jones , "linux-kernel@vger.kernel.org" , Leif Lindholm , Geert Uytterhoeven , Rob Herring , "linuxppc-dev@lists.ozlabs.org" X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.16 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Wed, 23 Apr 2014 11:45:28 +0100, Mark Rutland wrote: > On Tue, Apr 22, 2014 at 02:35:15PM +0100, Grant Likely wrote: > > On Fri, 18 Apr 2014 13:59:24 +0100, Leif Lindholm wrote: > > > Hi Geert, > > > > > > On Fri, Apr 18, 2014 at 10:04:15AM +0200, Geert Uytterhoeven wrote: > > > > On Thu, Apr 17, 2014 at 7:42 PM, Leif Lindholm wrote: > > > > > In order to deal with an firmware bug on a specific ppc32 platform > > > > > (longtrail), early_init_dt_scan_memory() looks for a node called > > > > > memory@0 on all platforms. Restrict this quirk to ppc32 kernels only. > > > > > > > > This breaks backwards compatibilty with old DTSes (at least on ARM/MIPS, > > > > where you added the missing property in patches 1 and 2 of the series)? > > > > > > As Rob said in response to 0/3, the MIPSs would likely not be affected, > > > since they embed the DT. > > > > > > > For the Longtrail, I don't care much anymore, as mine died in 2004. > > > > AFAIK, there have never been many users anyway. > > > > > > There are still a few mentions of it under arch/powerpc/, so I wouldn't > > > want to be the one to kill it off... > > > > > > How about the below v2 3/3 to address the ARM platform? > > > > The problem with this approach is that selecting one board that needs it > > automatically makes it active for all boards. It would need to be > > something more like the following: > > > > diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c > > index 399e242e1a42..55d65b2b4c74 100644 > > --- a/drivers/of/fdt.c > > +++ b/drivers/of/fdt.c > > @@ -887,12 +887,10 @@ int __init early_init_dt_scan_memory(unsigned long node, const char *uname, > > > > /* We are scanning "memory" nodes only */ > > if (type == NULL) { > > - /* > > - * The longtrail doesn't have a device_type on the > > - * /memory node, so look for the node called /memory@0. > > - */ > > if (depth != 1 || strcmp(uname, "memory@0") != 0) > > return 0; > > + if (!of_flat_dt_match(dt_root, memory_quirk_list)) > > + return 0; > > } else if (strcmp(type, "memory") != 0) > > return 0; > > > > With a list of compatible properties for affected boards. > > That looks sane to me. > > Does anyone have a LongTrail DT to hand, and if so does the root have a > compatible string? From grepping through the kernel I could only find a > model string ("IBM,LongTrail"). Actually, on LongTrail this can be removed from the common code entirely. It has real open firmware and PowerPC already has the infrastructure for fixing up the device tree. Here's a draft patch that I've compile tested, but nothing else. g. diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c index 078145acf7fb..18b2c3fee98f 100644 --- a/arch/powerpc/kernel/prom_init.c +++ b/arch/powerpc/kernel/prom_init.c @@ -2587,9 +2587,18 @@ static void __init fixup_device_tree_chrp(void) phandle ph; u32 prop[6]; u32 rloc = 0x01006000; /* IO space; PCI device = 12 */ - char *name; + char *name, strprop[16]; int rc; + /* Deal with missing device_type in LongTrail memory node */ + name = "/memory@0"; + ph = call_prom("finddevice", 1, 1, ADDR(name)); + rc = prom_getprop(ph, "device_type", strprop, sizeof(strprop)); + if (rc == PROM_ERROR || strcmp(strprop, "memory") != 0) { + prom_printf("Fixing up missing device_type on /memory@0 node...\n"); + prom_setprop(ph, name, "device_type", "memory", sizeof("memory")); + } + name = "/pci@80000000/isa@c"; ph = call_prom("finddevice", 1, 1, ADDR(name)); if (!PHANDLE_VALID(ph)) { diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 7a2ef7bb8022..7cda0d279cbe 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -886,14 +886,7 @@ int __init early_init_dt_scan_memory(unsigned long node, const char *uname, unsigned long l; /* We are scanning "memory" nodes only */ - if (type == NULL) { - /* - * The longtrail doesn't have a device_type on the - * /memory node, so look for the node called /memory@0. - */ - if (depth != 1 || strcmp(uname, "memory@0") != 0) - return 0; - } else if (strcmp(type, "memory") != 0) + if (!type || strcmp(type, "memory") != 0) return 0; reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);