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 3BFB7C3DA4A for ; Sat, 27 Jul 2024 08:57:06 +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: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=0MuhUckk0VXzhJfGW9UUy0U7v0eOoUyA6jdkdiPNwt4=; b=x6z/OddfWJiOJTjQ1TBVViCqsb azaqEXIJpsVLUWHMCnAxUkipuwZhW/kinj8u7+rkbJpXGQ21rIv3xKgp7KQTmqfEdnKMwDb86sfS7 pP01a9h6WmEZ4nZueRNNUXZDTOyClFtyydNjeCx02l6jlg+WpJqJdtcH99y63gV3yUwbpfYuVNef2 54ElC4XLyGcscBN7c9PteDISouJTTqWeRommJxFPEUWqVHiAc+EpF20QbLkP/9riD/VwrGJONw+yM WNdUuV/4ULXNcoD4o0Jm5B+6G9VmjOEAqvZtrY82gUf1RrKYmm04L/Pora3ZSJnlGPyahLPVhV15U Rqzx9I8Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sXdEV-00000006LrO-1L34; Sat, 27 Jul 2024 08:56:55 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sXdE5-00000006LmF-3ekE for linux-arm-kernel@lists.infradead.org; Sat, 27 Jul 2024 08:56:31 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 3D3D160DE7; Sat, 27 Jul 2024 08:56:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9DE82C32781; Sat, 27 Jul 2024 08:56:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1722070588; bh=YZX+eUFnTZVDI0mLazr1SxOOdIekJM920sukaMYLSKk=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=LJsNctujo4L47X4fMtysW/DacxQRGQCz0q3+ggHSUDOWFvnQwtHKZmK14FG3H+Ouk vpXRjjnZhqeBzSfVb+rVtEyT0S2l0FoGnTQGR2mASBYWjPh71CYIv7ew/KwFxy340I jcqSgak7IMzqQ5+AzhUv6+wiXGhoKOhgT6DUa572g0JWWp0cadDcrScnhSaTF/J0Zk 8OcoH6GFlzMGcEHbyu7BUOVm99d6cLA/hgW0PI3xmqefoidMxIaHtmzq52ERLCyWWa Vc87xR5SxZxQAwdKexUeJJkEKQiyT91imewHnfbTvdQvDk60kwSk7/4PolccmPgK8z y7LD3vZ5VIGtA== Message-ID: <7418bfcd-c572-4574-accc-7f2ae117529f@kernel.org> Date: Sat, 27 Jul 2024 10:56:18 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 6/7] Drivers: hv: vmbus: Get the IRQ number from DT To: Roman Kisel , arnd@arndb.de, bhelgaas@google.com, bp@alien8.de, catalin.marinas@arm.com, dave.hansen@linux.intel.com, decui@microsoft.com, haiyangz@microsoft.com, hpa@zytor.com, kw@linux.com, kys@microsoft.com, lenb@kernel.org, lpieralisi@kernel.org, mingo@redhat.com, rafael@kernel.org, robh@kernel.org, tglx@linutronix.de, wei.liu@kernel.org, will@kernel.org, linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, x86@kernel.org Cc: apais@microsoft.com, benhill@microsoft.com, ssengar@microsoft.com, sunilmut@microsoft.com, vdso@hexbites.dev References: <20240726225910.1912537-1-romank@linux.microsoft.com> <20240726225910.1912537-7-romank@linux.microsoft.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240727_015630_030570_E0AF1CAF X-CRM114-Status: GOOD ( 10.14 ) 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 On 27/07/2024 00:59, Roman Kisel wrote: > @@ -2338,6 +2372,21 @@ static int vmbus_device_add(struct platform_device *pdev) > cur_res = &res->sibling; > } > > + /* > + * Hyper-V always assumes DMA cache coherency, and the DMA subsystem > + * might default to 'not coherent' on some architectures. > + * Avoid high-cost cache coherency maintenance done by the CPU. > + */ > +#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \ > + defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \ > + defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) > + > + if (!of_property_read_bool(np, "dma-coherent")) > + pr_warn("Assuming cache coherent DMA transactions, no 'dma-coherent' node supplied\n"); Why do you need this property at all, if it is allways dma-coherent? Are you supporting dma-noncoherent somewhere? Best regards, Krzysztof