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 7001B31ED7E; Wed, 19 Nov 2025 20:09:37 +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=1763582978; cv=none; b=oQLObUQ6lphzKaSSjGt/leihBSL74pktZ0AgO2Xff3cC93UJdcDDCico7DwQmEIO1eLJHqcEDuqTuRJvKhQT44KyA70NlS476/PJVuSiCm2w+QKuL6ZV7gfE4irAjZX7eC1SvuKpbBl1XU9nwgJFNq/ojx2NyrLrqhU4WklyMo4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763582978; c=relaxed/simple; bh=csXQ3jv13Hi+tC+RGEzfEY46Xaln+wONRM6RuW7E20A=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Wrn1kY/AFV3Jcv7qcYg3zamBaORr1PeIQpmEx7B0ObgTwcrUVxuzYCDx4OPHdNRc+jv/0K0kpDDmdhzzjX16IdhHCWYAVdx7wgOyBGzhQ6mQBzojUZ/Bdo9k51I4Ck2K8PCUpky9+f/dxdKLiSlAD4WbkbgxltsNoGo0ImBglpY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hTBWEzXT; 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="hTBWEzXT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5E56FC4CEF5; Wed, 19 Nov 2025 20:09:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763582976; bh=csXQ3jv13Hi+tC+RGEzfEY46Xaln+wONRM6RuW7E20A=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=hTBWEzXTmeFGO55QIT6oupbvwDwUpgggVtpGnikSt82tZ2nUOKHkuqA3ISmqF8QcX vYisBqwiuz0WEfjy6s/svnZWZTOzUOmXS5I53X6xI7LfO3Kd5OwCqa5lBFWPqDHE/3 cF/gdhvxAGXV04Xp4R5s4p8BFc0hkg6PrfY0NOqRrVOJ7jkPyorf0T4Bo36Ku4IxYD Q4zVn5oBCcEYEA/Wld0ndgUyD0t2MTMR+uHwpKH58o0qxCE2jxoA0aIjzZUpluHPa9 yU23imw726vr3wqMMhrFFNOH3BlGeY+jDGVij9zix9bukjQ3LzjPpdgd1wVSBSvZlO cdoSbAlY/iZ0A== Date: Wed, 19 Nov 2025 12:09:34 -0800 From: Drew Fustini To: Jonathan Cameron Cc: Ben Horgan , james.morse@arm.com, amitsinght@marvell.com, baisheng.gao@unisoc.com, baolin.wang@linux.alibaba.com, bobo.shaobowang@huawei.com, carl@os.amperecomputing.com, catalin.marinas@arm.com, dakr@kernel.org, dave.martin@arm.com, david@redhat.com, dfustini@baylibre.com, fenghuay@nvidia.com, gregkh@linuxfoundation.org, gshan@redhat.com, guohanjun@huawei.com, jeremy.linton@arm.com, kobak@nvidia.com, lcherian@marvell.com, lenb@kernel.org, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, lpieralisi@kernel.org, peternewman@google.com, quic_jiles@quicinc.com, rafael@kernel.org, robh@kernel.org, rohit.mathew@arm.com, scott@os.amperecomputing.com, sdonthineni@nvidia.com, sudeep.holla@arm.com, tan.shaopeng@fujitsu.com, will@kernel.org, xhao@linux.alibaba.com Subject: Re: [PATCH 00/33] arm_mpam: Add basic mpam driver Message-ID: References: <20251107123450.664001-1-ben.horgan@arm.com> <753f4d26-efa9-4ffd-a820-7c2a53c0bc5f@arm.com> <20251119100051.000018a0@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251119100051.000018a0@huawei.com> On Wed, Nov 19, 2025 at 10:00:51AM +0000, Jonathan Cameron wrote: > On Tue, 18 Nov 2025 14:55:07 -0800 > Drew Fustini wrote: > > > On Tue, Nov 18, 2025 at 02:11:31PM +0000, Ben Horgan wrote: > > > Hi Drew, > > > > > > On 11/16/25 17:16, Drew Fustini wrote: > > > > On Fri, Nov 07, 2025 at 12:34:17PM +0000, Ben Horgan wrote: > > > >> Hi all, > > > > [snip] > > > >> The rest of the driver can be found here: (no updated version - based on v3) > > > >> https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/snapshot/v6.18-rc1 > > > > > > > > Does anyone know of a hosting platform that offers ARM machines that > > > > have MPAM? > > > > > > As far as I know there aren't any. > > > > > > There is some MPAM support in the Orion Radxa board which is likely the > > > cheapest option. The MPAM acpi table isn't in the firmware though so > > > you'd need to load a custom table. James has this working. > > > > Thank you, I didn't realize that there was a dev board that supports > > MPAM. I didn't want to the expense or noise of a rackable server :) > > > > Drew > > > Hi Drew, > > Obvious not functional as such, but I did spin qemu emulation with a bunch > of introspection so you could see what was configured. Aim was to poke > corner cases more easily than with real hardware. Did it's job at the time > and shook out some bugs. > > I haven't rebased it recently though. > https://lore.kernel.org/qemu-devel/20230808115713.2613-1-Jonathan.Cameron@huawei.com/ > > https://gitlab.com/jic23/qemu/-/commits/mpam-2023-sept-01 > Has what looks to be a slightly more recent rebase. > > No monitor support though. > > I might bring this back to poke the rest of this series as it moves forwards > (or if anyone else wants to they are welcome to do so) > > FWIW we could in theory hook this up to the cache plugins to get some 'plausible' > numbers, but I never bothered as we have hardware (as seen by tested-by's on this > series). > > Jonathan Thanks for pointing out your series and the branch from James. Qemu is the cheapest way for me to try MPAM :) Drew