From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 4E3E94C9B; Sat, 27 Jul 2024 08:56:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722070589; cv=none; b=P1t52BBROql032o4ac6NoiDA+calAYyjuDzxQm+VMNE377g1+HG/mBDMO9sgOcTfj+lERzLe71QQ2Df1R3UcJQE+iQE0gxPN+YJV2uoOhbo+fhuc+zhd/D/nd/xHHInTv1RBZ8Ks8W2vQmQo9VXtfkKn/sUXfCZL6gTT/OBYLGI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722070589; c=relaxed/simple; bh=YZX+eUFnTZVDI0mLazr1SxOOdIekJM920sukaMYLSKk=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=L5JsB2kcn3f8cYXza0nvhsvhGzUuGPfxSSiQG/gao9eSdjV8fx8y081JKAsVfMg/abXCnOqGjy4wg399FmROneHzXgAv/LNIKBVuH/hlcRwJQOY0POQgQAPazF2eqR8X5q3mmbmMWWzUF/LmSVP+vQlgNSlFOBaj8UCh9IqiqZw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LJsNctuj; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LJsNctuj" 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 Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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