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 A950C220693; Sun, 9 Feb 2025 20:50:52 +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=1739134252; cv=none; b=oC8vZ0yHuV9n7g0mbbQDidAtvnRQ0wxiSGoSNXU3qQrEzXc4QnjYAPR6kroA7SinHk1U7cxEOdlWpDLEMhS9np7cDjwOyINKFArNntgTMKaoiP7vcHZyi+fGco2GJwupYgIF4YP2f/JlyhgkFdrkZLJDKJVjbDAkqHCfaxKPbmQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739134252; c=relaxed/simple; bh=nYh6HS/8YhYPUbpFj0lcvwBp+jEeNeVWldCm/vWJV6w=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=gHkZdeaUwjvHJIjz5Iu19WqlXOTPzushgc2C+qlXyNQIGeqSRHdLsJkV7CxKwG32GJWwEBqlQloVmR1YrSM11zn3wcZEOF2yMKZwvrHOVUvYagHB/NYYVxB2C36t4uHHlHLGbxEOPBzDLwmhXdlf4EI8LbvnqnIX0zNQFTIWhaw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FRoXnfew; 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="FRoXnfew" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5816CC4CEDD; Sun, 9 Feb 2025 20:50:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1739134252; bh=nYh6HS/8YhYPUbpFj0lcvwBp+jEeNeVWldCm/vWJV6w=; h=Date:Subject:From:To:Cc:References:In-Reply-To:From; b=FRoXnfewBrxuCbbhALBsvsNs+tIGI2i7J1Yhkl23PaokLqsGphsoDBqlba8Dc21C9 8z+X9lYQr8N10vRumpkokgJaKIyyD4Y6dgG9PDoauwTe9EvTNynnTuhQZDOc/DdD0Q Xnisd7BQ2zmWehNaO+m7sLwGT60EQR/Rfej6w3NAmvDTd5TNKs7iryubycPlRLpKd8 PzfZZSIwftUllTLMsa0Z217TjJ5RgbkujfegcHLXKzAKKpNLdPniFnl8OHk98t+ezY OBE9iLm7eewcAJeVMC6RI+S1HCeqlmqBm7ztBZ4VecgFLEK8QmUI5Z/tau+pzi+7eT 7NpranzMzhUVg== Message-ID: Date: Sun, 9 Feb 2025 21:50:37 +0100 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 14/14] Documentation: KHO: Add memblock bindings From: Krzysztof Kozlowski To: Mike Rapoport Cc: linux-kernel@vger.kernel.org, Alexander Graf , Andrew Morton , Andy Lutomirski , Anthony Yznaga , Arnd Bergmann , Ashish Kalra , Benjamin Herrenschmidt , Borislav Petkov , Catalin Marinas , Dave Hansen , David Woodhouse , Eric Biederman , Ingo Molnar , James Gowans , Jonathan Corbet , Mark Rutland , Paolo Bonzini , Pasha Tatashin , "H. Peter Anvin" , Peter Zijlstra , Pratyush Yadav , Rob Herring , Rob Herring , Saravana Kannan , Stanislav Kinsburskii , Steven Rostedt , Thomas Gleixner , Tom Lendacky , Usama Arif , Will Deacon , devicetree@vger.kernel.org, kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org References: <20250206132754.2596694-1-rppt@kernel.org> <20250206132754.2596694-15-rppt@kernel.org> <45df0d7a-622a-4268-9683-c5c6067483c3@kernel.org> <18529b1f-dc79-4c85-a485-a0a2cdd48670@kernel.org> Content-Language: en-US Autocrypt: addr=krzk@kernel.org; keydata= xsFNBFVDQq4BEAC6KeLOfFsAvFMBsrCrJ2bCalhPv5+KQF2PS2+iwZI8BpRZoV+Bd5kWvN79 cFgcqTTuNHjAvxtUG8pQgGTHAObYs6xeYJtjUH0ZX6ndJ33FJYf5V3yXqqjcZ30FgHzJCFUu JMp7PSyMPzpUXfU12yfcRYVEMQrmplNZssmYhiTeVicuOOypWugZKVLGNm0IweVCaZ/DJDIH gNbpvVwjcKYrx85m9cBVEBUGaQP6AT7qlVCkrf50v8bofSIyVa2xmubbAwwFA1oxoOusjPIE J3iadrwpFvsZjF5uHAKS+7wHLoW9hVzOnLbX6ajk5Hf8Pb1m+VH/E8bPBNNYKkfTtypTDUCj NYcd27tjnXfG+SDs/EXNUAIRefCyvaRG7oRYF3Ec+2RgQDRnmmjCjoQNbFrJvJkFHlPeHaeS BosGY+XWKydnmsfY7SSnjAzLUGAFhLd/XDVpb1Een2XucPpKvt9ORF+48gy12FA5GduRLhQU vK4tU7ojoem/G23PcowM1CwPurC8sAVsQb9KmwTGh7rVz3ks3w/zfGBy3+WmLg++C2Wct6nM Pd8/6CBVjEWqD06/RjI2AnjIq5fSEH/BIfXXfC68nMp9BZoy3So4ZsbOlBmtAPvMYX6U8VwD TNeBxJu5Ex0Izf1NV9CzC3nNaFUYOY8KfN01X5SExAoVTr09ewARAQABzSVLcnp5c3p0b2Yg S296bG93c2tpIDxrcnprQGtlcm5lbC5vcmc+wsGVBBMBCgA/AhsDBgsJCAcDAgYVCAIJCgsE FgIDAQIeAQIXgBYhBJvQfg4MUfjVlne3VBuTQ307QWKbBQJgPO8PBQkUX63hAAoJEBuTQ307 QWKbBn8P+QFxwl7pDsAKR1InemMAmuykCHl+XgC0LDqrsWhAH5TYeTVXGSyDsuZjHvj+FRP+ gZaEIYSw2Yf0e91U9HXo3RYhEwSmxUQ4Fjhc9qAwGKVPQf6YuQ5yy6pzI8brcKmHHOGrB3tP /MODPt81M1zpograAC2WTDzkICfHKj8LpXp45PylD99J9q0Y+gb04CG5/wXs+1hJy/dz0tYy iua4nCuSRbxnSHKBS5vvjosWWjWQXsRKd+zzXp6kfRHHpzJkhRwF6ArXi4XnQ+REnoTfM5Fk VmVmSQ3yFKKePEzoIriT1b2sXO0g5QXOAvFqB65LZjXG9jGJoVG6ZJrUV1MVK8vamKoVbUEe 0NlLl/tX96HLowHHoKhxEsbFzGzKiFLh7hyboTpy2whdonkDxpnv/H8wE9M3VW/fPgnL2nPe xaBLqyHxy9hA9JrZvxg3IQ61x7rtBWBUQPmEaK0azW+l3ysiNpBhISkZrsW3ZUdknWu87nh6 eTB7mR7xBcVxnomxWwJI4B0wuMwCPdgbV6YDUKCuSgRMUEiVry10xd9KLypR9Vfyn1AhROrq AubRPVeJBf9zR5UW1trJNfwVt3XmbHX50HCcHdEdCKiT9O+FiEcahIaWh9lihvO0ci0TtVGZ MCEtaCE80Q3Ma9RdHYB3uVF930jwquplFLNF+IBCn5JRzsFNBFVDXDQBEADNkrQYSREUL4D3 Gws46JEoZ9HEQOKtkrwjrzlw/tCmqVzERRPvz2Xg8n7+HRCrgqnodIYoUh5WsU84N03KlLue MNsWLJBvBaubYN4JuJIdRr4dS4oyF1/fQAQPHh8Thpiz0SAZFx6iWKB7Qrz3OrGCjTPcW6ei OMheesVS5hxietSmlin+SilmIAPZHx7n242u6kdHOh+/SyLImKn/dh9RzatVpUKbv34eP1wA GldWsRxbf3WP9pFNObSzI/Bo3kA89Xx2rO2roC+Gq4LeHvo7ptzcLcrqaHUAcZ3CgFG88CnA 6z6lBZn0WyewEcPOPdcUB2Q7D/NiUY+HDiV99rAYPJztjeTrBSTnHeSBPb+qn5ZZGQwIdUW9 YegxWKvXXHTwB5eMzo/RB6vffwqcnHDoe0q7VgzRRZJwpi6aMIXLfeWZ5Wrwaw2zldFuO4Dt 91pFzBSOIpeMtfgb/Pfe/a1WJ/GgaIRIBE+NUqckM+3zJHGmVPqJP/h2Iwv6nw8U+7Yyl6gU BLHFTg2hYnLFJI4Xjg+AX1hHFVKmvl3VBHIsBv0oDcsQWXqY+NaFahT0lRPjYtrTa1v3tem/ JoFzZ4B0p27K+qQCF2R96hVvuEyjzBmdq2esyE6zIqftdo4MOJho8uctOiWbwNNq2U9pPWmu 4vXVFBYIGmpyNPYzRm0QPwARAQABwsF8BBgBCgAmAhsMFiEEm9B+DgxR+NWWd7dUG5NDfTtB YpsFAmA872oFCRRflLYACgkQG5NDfTtBYpvScw/9GrqBrVLuJoJ52qBBKUBDo4E+5fU1bjt0 Gv0nh/hNJuecuRY6aemU6HOPNc2t8QHMSvwbSF+Vp9ZkOvrM36yUOufctoqON+wXrliEY0J4 ksR89ZILRRAold9Mh0YDqEJc1HmuxYLJ7lnbLYH1oui8bLbMBM8S2Uo9RKqV2GROLi44enVt vdrDvo+CxKj2K+d4cleCNiz5qbTxPUW/cgkwG0lJc4I4sso7l4XMDKn95c7JtNsuzqKvhEVS oic5by3fbUnuI0cemeizF4QdtX2uQxrP7RwHFBd+YUia7zCcz0//rv6FZmAxWZGy5arNl6Vm lQqNo7/Poh8WWfRS+xegBxc6hBXahpyUKphAKYkah+m+I0QToCfnGKnPqyYIMDEHCS/RfqA5 t8F+O56+oyLBAeWX7XcmyM6TGeVfb+OZVMJnZzK0s2VYAuI0Rl87FBFYgULdgqKV7R7WHzwD uZwJCLykjad45hsWcOGk3OcaAGQS6NDlfhM6O9aYNwGL6tGt/6BkRikNOs7VDEa4/HlbaSJo 7FgndGw1kWmkeL6oQh7wBvYll2buKod4qYntmNKEicoHGU+x91Gcan8mCoqhJkbqrL7+nXG2 5Q/GS5M9RFWS+nYyJh+c3OcfKqVcZQNANItt7+ULzdNJuhvTRRdC3g9hmCEuNSr+CLMdnRBY fv0= In-Reply-To: <18529b1f-dc79-4c85-a485-a0a2cdd48670@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 09/02/2025 21:49, Krzysztof Kozlowski wrote: >>>> >>>> These are not devicetree binding for communicating data from firmware to >>>> the kernel. These bindings are specific to KHO which is perfectly >>>> reflected by the subject. >>> >>> No, it is not. None of the bindings use above subject prefix. >>> >>>> >>>> Just a brief reminder from v2 discussion: >>>> (https://lore.kernel.org/linux-mm/20231222193607.15474-1-graf@amazon.com/) >>>> >>>> "For quick reference: KHO is a new mechanism this patch set introduces >>>> which allows Linux to pass arbitrary memory and metadata between kernels >>>> on kexec. I'm reusing FDTs to implement the hand over protocol, as >>>> Linux-to-Linux boot communication holds very similar properties to >>>> firmware-to-Linux boot communication. So this binding is not about >>>> hardware; it's about preserving Linux subsystem state across kexec. >>> >>> does not matter. You added file to ABI documentation so you must follow >>> that ABI documentation rules. One rule is proper subject prefix. >> >> No, it does not. It's a different ABI. >> >> FDT is a _data structure_ that provides cross platform unified, versioned, >> introspectable data format. >> >> Documentation/devicetree/bindings standardizes it's use for describing >> hardware, but KHO uses FDT _data structure_ to describe state of the kernel >> components that will be reused by the kexec'ed kernel. >> >> KHO is a different namespace from Open Firmware Device Tree, with different >> requirements and different stakeholders. Putting descriptions of KHO data >> formats in Documentation/kho rather than in >> Documentation/devicetree/bindings was not done to evade review of Open >> Firmware Device Tree maintainers, but rather to emphasize that KHO FDT _is >> not_ Open Firmware Device Tree. > > > Ah, neat, that would almost solve the problem but you wrote: > > +$id: http://devicetree.org/schemas/memblock/reserve_mem.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > > so no, this does not work like that. You use devicetree here namespace > and ignore its rules. ... and that obviously is barely parseable, so maybe one more try: "You use here devicetree namespace but ignore its rules." > > You cannot pretend this is not devicetree if you put it into devicetree > schemas. Best regards, Krzysztof