From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750997AbdAXR5G (ORCPT ); Tue, 24 Jan 2017 12:57:06 -0500 Received: from foss.arm.com ([217.140.101.70]:48238 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750779AbdAXR5D (ORCPT ); Tue, 24 Jan 2017 12:57:03 -0500 Message-ID: <58879514.1020501@arm.com> Date: Tue, 24 Jan 2017 17:55:32 +0000 From: James Morse User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.6.0 MIME-Version: 1.0 To: "Baicar, Tyler" CC: christoffer.dall@linaro.org, marc.zyngier@arm.com, pbonzini@redhat.com, rkrcmar@redhat.com, linux@armlinux.org.uk, catalin.marinas@arm.com, will.deacon@arm.com, rjw@rjwysocki.net, lenb@kernel.org, matt@codeblueprint.co.uk, robert.moore@intel.com, lv.zheng@intel.com, nkaje@codeaurora.org, zjzhang@codeaurora.org, mark.rutland@arm.com, akpm@linux-foundation.org, eun.taik.lee@samsung.com, sandeepa.s.prabhu@gmail.com, labbott@redhat.com, shijie.huang@arm.com, rruigrok@codeaurora.org, paul.gortmaker@windriver.com, tn@semihalf.com, fu.wei@linaro.org, rostedt@goodmis.org, bristot@redhat.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-efi@vger.kernel.org, devel@acpica.org, Suzuki.Poulose@arm.com, punit.agrawal@arm.com, astone@redhat.com, harba@codeaurora.org, hanjun.guo@linaro.org, john.garry@huawei.com, shiju.jose@huawei.com Subject: Re: [PATCH V7 05/10] acpi: apei: handle SEA notification type for ARMv8 References: <1484244924-24786-1-git-send-email-tbaicar@codeaurora.org> <1484244924-24786-6-git-send-email-tbaicar@codeaurora.org> <587F80A7.10008@arm.com> <3de443d7-2c68-f179-daae-bc8f851470b7@codeaurora.org> <5880FDFC.7060304@arm.com> <8b9d254a-5450-d841-baf7-5819a88043e4@codeaurora.org> In-Reply-To: <8b9d254a-5450-d841-baf7-5819a88043e4@codeaurora.org> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Tyler, On 20/01/17 20:58, Baicar, Tyler wrote: > On 1/19/2017 10:57 AM, James Morse wrote: >> On 18/01/17 23:51, Baicar, Tyler wrote: >>> On 1/18/2017 7:50 AM, James Morse wrote: >>>> On 12/01/17 18:15, Tyler Baicar wrote: >>>>> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c >> There are two other things that need changing to make the in_nmi() code path >> work on arm64. >> Always reserve the virtual-address-space forcing GHES_IOREMAP_PAGES to be 2 >> regardless of CONFIG_HAVE_ACPI_APEI_NMI. This is almost revert of >> 594c7255dce7a13cac50cf2470cc56e2c3b0494e (but that did a few other things too). > Looks simple enough, should I force it to 2 in all cases, or add a check for > CONFIG_HAVE_ACPI_APEI_SEA > similar to the check for CONFIG_HAVE_ACPI_APEI_NMI? Its just address space not actual memory it is reserving right? I think just reserve two pages all the time to save eye-sore #ifdefs! >> We also need to fix ghes_ioremap_pfn_nmi() to use arch_apei_get_mem_attribute() >> and not assume PAGE_KERNEL. > So just change the call to ioremap_page_range to: > > ioremap_page_range(vaddr, vaddr + PAGE_SIZE, pfn << PAGE_SHIFT, > arch_apei_get_mem_attribute()); (you need to give arch_apei_get_mem_attribute() the address...) copying whatever ghes_ioremap_pfn_irq() does a few lines down is probably best. Thanks, James