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=-15.3 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 3E483C11F68 for ; Fri, 2 Jul 2021 13:19:16 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BCC5061413 for ; Fri, 2 Jul 2021 13:19:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BCC5061413 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4GGbJf1sDJz3bbK for ; Fri, 2 Jul 2021 23:19:14 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=UpJXnxcF; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=198.145.29.99; helo=mail.kernel.org; envelope-from=will@kernel.org; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=UpJXnxcF; dkim-atps=neutral Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4GGbJ42bNtz2yNh for ; Fri, 2 Jul 2021 23:18:44 +1000 (AEST) Received: by mail.kernel.org (Postfix) with ESMTPSA id 4D3B36109D; Fri, 2 Jul 2021 13:18:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625231920; bh=GDNc99vWU2EKYVywroGm/MONGRMfJ1bw5GtcP1Kxyew=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=UpJXnxcF4r+u8N9In3Ngt/3KsBiIssEtR46hbKVGD4imJoDwZps2CiNu9/tX6XODL RkRPeCMJzkowmvGyx+vBIS2hY1z4ccknZBrbZdUt3JmjE2xh4ItTea2grkiScPUhIn HLmoRTEOJQbfW+p5GY0xQ0VKUewGU1RsIqEJOhMbpuv3pp74w18YlrSAOnrKBIP55s v+J/uIyo0HZY5XHsn1OOtuplTl/3fBAHP0aXr8wAQJjJJZ7gIcW+IXijJkOA5vhe1e A78+z8Z0KIiDl7b4jtkq2bGKSaVHIDksVIMFkEDwiE3IncWj68Vxm0ezE9lm9A76mg Qcdpn8Gt/MWYA== Date: Fri, 2 Jul 2021 14:18:29 +0100 From: Will Deacon To: Robin Murphy Subject: Re: [PATCH v15 12/12] of: Add plumbing for restricted DMA pool Message-ID: <20210702131829.GA11132@willie-the-truck> References: <20210624155526.2775863-1-tientzu@chromium.org> <20210624155526.2775863-13-tientzu@chromium.org> <20210702030807.GA2685166@roeck-us.net> <87ca3ada-22ed-f40c-0089-ca6fffc04f24@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87ca3ada-22ed-f40c-0089-ca6fffc04f24@arm.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: heikki.krogerus@linux.intel.com, linux-devicetree , peterz@infradead.org, linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, grant.likely@arm.com, paulus@samba.org, Frank Rowand , mingo@kernel.org, jxgao@google.com, sstabellini@kernel.org, Saravana Kannan , Joerg Roedel , "Rafael J . Wysocki" , Christoph Hellwig , Bartosz Golaszewski , bskeggs@redhat.com, xen-devel@lists.xenproject.org, Marek Szyprowski , Guenter Roeck , matthew.auld@intel.com, Nicolas Boichat , thomas.hellstrom@linux.intel.com, Konrad Rzeszutek Wilk , intel-gfx@lists.freedesktop.org, Dan Williams , Rob Herring , rodrigo.vivi@intel.com, bhelgaas@google.com, Claire Chang , boris.ostrovsky@oracle.com, Andy Shevchenko , jgross@suse.com, airlied@linux.ie, Thierry Reding , Greg KH , Randy Dunlap , quic_qiancai@quicinc.com, lkml , tfiga@chromium.org, "list@263.net:IOMMU DRIVERS" , Jim Quinlan , xypron.glpk@gmx.de, thomas.lendacky@amd.com, linuxppc-dev@lists.ozlabs.org, bauerman@linux.ibm.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Fri, Jul 02, 2021 at 12:39:41PM +0100, Robin Murphy wrote: > On 2021-07-02 04:08, Guenter Roeck wrote: > > On Thu, Jun 24, 2021 at 11:55:26PM +0800, Claire Chang wrote: > > > If a device is not behind an IOMMU, we look up the device node and set > > > up the restricted DMA when the restricted-dma-pool is presented. > > > > > > Signed-off-by: Claire Chang > > > Tested-by: Stefano Stabellini > > > Tested-by: Will Deacon > > > > With this patch in place, all sparc and sparc64 qemu emulations > > fail to boot. Symptom is that the root file system is not found. > > Reverting this patch fixes the problem. Bisect log is attached. > > Ah, OF_ADDRESS depends on !SPARC, so of_dma_configure_id() is presumably > returning an unexpected -ENODEV from the of_dma_set_restricted_buffer() > stub. That should probably be returning 0 instead, since either way it's not > an error condition for it to simply do nothing. Something like below? Will --->8 >From 4d9dcb9210c1f37435b6088284e04b6b36ee8c4d Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Fri, 2 Jul 2021 14:13:28 +0100 Subject: [PATCH] of: Return success from of_dma_set_restricted_buffer() when !OF_ADDRESS When CONFIG_OF_ADDRESS=n, of_dma_set_restricted_buffer() returns -ENODEV and breaks the boot for sparc[64] machines. Return 0 instead, since the function is essentially a glorified NOP in this configuration. Cc: Claire Chang Cc: Konrad Rzeszutek Wilk Reported-by: Guenter Roeck Suggested-by: Robin Murphy Link: https://lore.kernel.org/r/20210702030807.GA2685166@roeck-us.net Signed-off-by: Will Deacon --- drivers/of/of_private.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h index 8fde97565d11..34dd548c5eac 100644 --- a/drivers/of/of_private.h +++ b/drivers/of/of_private.h @@ -173,7 +173,8 @@ static inline int of_dma_get_range(struct device_node *np, static inline int of_dma_set_restricted_buffer(struct device *dev, struct device_node *np) { - return -ENODEV; + /* Do nothing, successfully. */ + return 0; } #endif -- 2.32.0.93.g670b81a890-goog