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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97A37C433FE for ; Fri, 22 Oct 2021 17:29:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7F0AF60FF2 for ; Fri, 22 Oct 2021 17:29:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233406AbhJVRcK (ORCPT ); Fri, 22 Oct 2021 13:32:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39132 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231453AbhJVRcJ (ORCPT ); Fri, 22 Oct 2021 13:32:09 -0400 Received: from mail-pj1-x102f.google.com (mail-pj1-x102f.google.com [IPv6:2607:f8b0:4864:20::102f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 43319C061764; Fri, 22 Oct 2021 10:29:52 -0700 (PDT) Received: by mail-pj1-x102f.google.com with SMTP id u6-20020a17090a3fc600b001a00250584aso6280587pjm.4; Fri, 22 Oct 2021 10:29:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=9g3SS96B24RbA0UM0N0/J0717Xuebx832cXs0RhSY7g=; b=l/2NN9IRgQDaV1hDk4pHNDsUHOTFbp3o+nZCTFf6GnamLb9K/Sn36TQf8TlNmX1cFh 12Ubuvp4UHnBWV0HihqyjYnBjSou7UBSFem2RURf42hm7Ynk8nAXsXAK9nqxbUqacCRZ HV4IogaW0XmEdAFQv4dzTzJj7g6WVlCq2hWR5l+k/fy+qQwmNWHI7NIaq54m0nlkpAuD eUKbom5zYkxPnBIutfY4OwsAbxdfVuWv+M8+3AuoH6ukrrEqeMXBiMlfymTq2jKrsMLT aPEjAfdFpsgWwxM1JlB/7DDbuSOefAi4xCGX1l351+gyapj6V+T2f3YiA25bikwKEodS BEkw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=9g3SS96B24RbA0UM0N0/J0717Xuebx832cXs0RhSY7g=; b=su2XhJO1n4Nz0uNglJ62+MsqkrdvXcxCR/0Tm9Urqfzaz3T5Hx8pCSc1khGGy+Zo9M ZlmEBdd/fCCAY9lySEQ2L1HSguhdjC4ZSmwIqfxa+NIuSmOQuSsd2pT9wJ+ypvkcWy5S E0gURbVrlPqopnGHfJlMdk/4ptOGTKhBoqVZ4Y9O3ccdCB8itNcf5HFtObaqJXBI4w3v bsZMU3UQRuscXA3pWimoaHZJppvo+986vzasOb4ZfJHEH9rEjj714z28aJ0dDp04bOFW CQFLNW5wmeIqOAQBDZW3KrgPL0kUxirNk5cOcLkcaVaAf8FKy/Q7WvPpDcEJZq+yVccc 4taQ== X-Gm-Message-State: AOAM531zB1mm/b6DNfwI6R/O4KgulE6YJt//aFBnGyPti+YnuD/HrRO8 NYNj2He5heANo5HYPncFHsYyLVtPC54= X-Google-Smtp-Source: ABdhPJxezLurfmK5izcjd7eKKLaTo3YUGvjArBGaamxSn1mIbVxxT9SKHmOZQoQpE1e3adlA2481hw== X-Received: by 2002:a17:90a:e7ca:: with SMTP id kb10mr16062293pjb.139.1634923791080; Fri, 22 Oct 2021 10:29:51 -0700 (PDT) Received: from [10.67.48.245] ([192.19.223.252]) by smtp.googlemail.com with ESMTPSA id gk1sm11992725pjb.2.2021.10.22.10.29.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 22 Oct 2021 10:29:50 -0700 (PDT) Subject: Re: [PATCH v3 2/4] PCI: brcmstb: Add ACPI config space quirk To: =?UTF-8?Q?Pali_Roh=c3=a1r?= Cc: Jeremy Linton , Bjorn Helgaas , linux-pci@vger.kernel.org, lorenzo.pieralisi@arm.com, nsaenz@kernel.org, bhelgaas@google.com, rjw@rjwysocki.net, lenb@kernel.org, robh@kernel.org, kw@linux.com, bcm-kernel-feedback-list@broadcom.com, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20211005153209.GA1083986@bhelgaas> <20211005194301.enb5jddzdgczcolx@pali> <694bb355-3b5e-9801-3772-ff784b49a603@arm.com> <6be712f8-c794-aa55-8679-5ddb5a16bcef@gmail.com> <20211022171728.vlxb3sfebfpgijmp@pali> From: Florian Fainelli Message-ID: <3a956549-3304-5a4c-3058-eccfac44d31b@gmail.com> Date: Fri, 22 Oct 2021 10:29:48 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <20211022171728.vlxb3sfebfpgijmp@pali> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org On 10/22/21 10:17 AM, Pali Rohár wrote: > On Friday 22 October 2021 10:04:36 Florian Fainelli wrote: >> On 10/5/21 7:07 PM, Florian Fainelli wrote: >>> >>> >>> On 10/5/2021 3:25 PM, Jeremy Linton wrote: >>>> Hi, >>>> >>>> On 10/5/21 2:43 PM, Pali Rohár wrote: >>>>> Hello! >>>>> >>>>> On Tuesday 05 October 2021 10:57:18 Jeremy Linton wrote: >>>>>> Hi, >>>>>> >>>>>> On 10/5/21 10:32 AM, Bjorn Helgaas wrote: >>>>>>> On Thu, Aug 26, 2021 at 02:15:55AM -0500, Jeremy Linton wrote: >>>>>>>> Additionally, some basic bus/device filtering exist to avoid sending >>>>>>>> config transactions to invalid devices on the RP's primary or >>>>>>>> secondary bus. A basic link check is also made to assure that >>>>>>>> something is operational on the secondary side before probing the >>>>>>>> remainder of the config space. If either of these constraints are >>>>>>>> violated and a config operation is lost in the ether because an EP >>>>>>>> doesn't respond an unrecoverable SERROR is raised. >>>>>>> >>>>>>> It's not "lost"; I assume the root port raises an error because it >>>>>>> can't send a transaction over a link that is down. >>>>>> >>>>>> The problem is AFAIK because the root port doesn't do that. >>>>> >>>>> Interesting! Does it mean that PCIe Root Complex / Host Bridge (which I >>>>> guess contains also logic for Root Port) does not signal transaction >>>>> failure for config requests? Or it is just your opinion? Because I'm >>>>> dealing with similar issues and I'm trying to find a way how to detect >>>>> if some PCIe IP signal transaction error via AXI SLVERR response OR it >>>>> just does not send any response back. So if you know some way how to >>>>> check which one it is, I would like to know it too. >>>> >>>> This is my _opinion_ based on what I've heard of some other IP >>>> integration issues, and what i've seen poking at this one from the >>>> perspective of a SW guy rather than a HW guy. So, basically worthless. >>>> But, you should consider that most of these cores/interconnects aren't >>>> aware of PCIe completion semantics so its the root ports >>>> responsibility to say, gracefully translate a non-posted write that >>>> doesn't have a completion for the interconnects its attached to, >>>> rather than tripping something generic like a SLVERR. >>>> >>>> Anyway, for this I would poke around the pile of exception registers, >>>> with your specific processors manual handy because a lot of them are >>>> implementation defined. >>> >>> I should be able to get you an answer in the new few days whether >>> configuration space requests also generate an error towards the ARM CPU, >>> since memory space requests most definitively do. >> >> Did not get an answer from the design team, but going through our bug >> tracker, there were evidences of configuration space accesses also >> generating external aborts: >> >> [ 8.988237] Unhandled fault: synchronous external abort (0x96000210) at 0xffffff8009539004 >> [ 9.026698] PC is at pci_generic_config_read32+0x30/0xb0 > > So this is error caused by reading from config space. > > Can you check if also writing to config space can trigger some crash? If > yes, I would like to know if write would be also synchronous or rather > asynchronous abort. Yes it does and AFAICT it always shows up as a system error interrupt, here is an example: # setpci -d *:* latency_timer=40 [ 25.909644] SError Interrupt on CPU2, code 0xbf000002 -- SError [ 25.909647] CPU: 2 PID: 1676 Comm: setpci Not tainted 5.10.70-0.2pre-ge3872e15011b #2 [ 25.909649] Hardware name: BCM972165SV_V10 (DT) [ 25.909651] pstate: 60000005 (nZCv daif -PAN -UAO -TCO BTYPE=--) [ 25.909652] pc : pci_user_write_config_byte+0x6c/0x78 [ 25.909654] lr : pci_user_write_config_byte+0x68/0x78 [ 25.909655] sp : ffffffc015853c20 [ 25.909656] x29: ffffffc015853c20 x28: ffffff8003053000 [ 25.909661] x27: 0000000000000000 x26: 0000000000000000 [ 25.909664] x25: 0000000000000001 x24: ffffff8004a23780 [ 25.909668] x23: ffffff80049aa000 x22: ffffffc015853d68 [ 25.909671] x21: 0000000000000040 x20: 000000000000000d [ 25.909674] x19: 000000000000000e x18: 0000000000000000 [ 25.909677] x17: 0000000000000000 x16: 0000000000000000 [ 25.909680] x15: 0000000000000000 x14: 0000000000000000 [ 25.909684] x13: 0000000000000000 x12: 0000000000000000 [ 25.909687] x11: 0000000000000000 x10: 0000000000000000 [ 25.909690] x9 : ffffffc010483214 x8 : 0000000000000000 [ 25.909693] x7 : ffffff800498df00 x6 : ffffff80049a8380 [ 25.909696] x5 : ffffffc015510000 x4 : ffffff80049a9800 [ 25.909699] x3 : 0000000000000000 x2 : 000000000000000d [ 25.909702] x1 : 0000000000000000 x0 : 0000000000000000 [ 25.909706] Kernel panic - not syncing: Asynchronous SError Interrupt [ 25.909708] CPU: 2 PID: 1676 Comm: setpci Not tainted 5.10.70-0.2pre-ge3872e15011b #2 [ 25.909710] Hardware name: BCM972165SV_V10 (DT) [ 25.909711] Call trace: [ 25.909712] dump_backtrace+0x0/0x1d0 [ 25.909713] show_stack+0x1c/0x24 [ 25.909714] dump_stack+0xd0/0x12c [ 25.909716] panic+0x128/0x308 [ 25.909717] nmi_panic+0x50/0x70 [ 25.909718] arm64_serror_panic+0x74/0x80 [ 25.909720] do_serror+0x28/0x60 [ 25.909721] el1_error+0x8c/0x10c [ 25.909722] pci_user_write_config_byte+0x6c/0x78 [ 25.909724] pci_write_config+0x7c/0x1a0 [ 25.909725] sysfs_kf_bin_write+0x64/0x84 [ 25.909727] kernfs_fop_write_iter+0xbc/0x170 [ 25.909728] new_sync_write+0x80/0xcc [ 25.909729] vfs_write+0xec/0x110 [ 25.909730] ksys_pwrite64+0x50/0x8c [ 25.909732] __arm64_sys_pwrite64+0x20/0x28 [ 25.909733] el0_svc_common.constprop.4+0x100/0x184 [ 25.909735] do_el0_svc+0x38/0x78 [ 25.909736] el0_svc+0x1c/0x28 [ 25.909737] el0_sync_handler+0x64/0x12c [ 25.909738] el0_sync+0x148/0x180 [ 25.909775] brcm-pcie 8b20000.pcie: Error: CFG Acc, 32bit, Write, Bus=1, Dev=0, Fun=0, Reg=0xc, lanes=01000000 [ 26.136082] brcm-pcie 8b20000.pcie: Type: TO=0 Abt=0 UnsupReq=0 AccTO=0 AccDsbld=1 Acc64bit=0 [ 26.144709] SMP: stopping secondary CPUs [ 26.144711] Kernel Offset: disabled [ 26.144712] CPU features: 0x0040002,24002004 [ 26.144713] Memory Limit: none -- Florian 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 mail.kernel.org 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linux-pci@vger.kernel.org, lorenzo.pieralisi@arm.com, nsaenz@kernel.org, bhelgaas@google.com, rjw@rjwysocki.net, lenb@kernel.org, robh@kernel.org, kw@linux.com, bcm-kernel-feedback-list@broadcom.com, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20211005153209.GA1083986@bhelgaas> <20211005194301.enb5jddzdgczcolx@pali> <694bb355-3b5e-9801-3772-ff784b49a603@arm.com> <6be712f8-c794-aa55-8679-5ddb5a16bcef@gmail.com> <20211022171728.vlxb3sfebfpgijmp@pali> From: Florian Fainelli Message-ID: <3a956549-3304-5a4c-3058-eccfac44d31b@gmail.com> Date: Fri, 22 Oct 2021 10:29:48 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <20211022171728.vlxb3sfebfpgijmp@pali> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211022_102951_951361_EF16488C X-CRM114-Status: GOOD ( 25.11 ) 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: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gMTAvMjIvMjEgMTA6MTcgQU0sIFBhbGkgUm9ow6FyIHdyb3RlOgo+IE9uIEZyaWRheSAyMiBP Y3RvYmVyIDIwMjEgMTA6MDQ6MzYgRmxvcmlhbiBGYWluZWxsaSB3cm90ZToKPj4gT24gMTAvNS8y MSA3OjA3IFBNLCBGbG9yaWFuIEZhaW5lbGxpIHdyb3RlOgo+Pj4KPj4+Cj4+PiBPbiAxMC81LzIw MjEgMzoyNSBQTSwgSmVyZW15IExpbnRvbiB3cm90ZToKPj4+PiBIaSwKPj4+Pgo+Pj4+IE9uIDEw LzUvMjEgMjo0MyBQTSwgUGFsaSBSb2jDoXIgd3JvdGU6Cj4+Pj4+IEhlbGxvIQo+Pj4+Pgo+Pj4+ PiBPbiBUdWVzZGF5IDA1IE9jdG9iZXIgMjAyMSAxMDo1NzoxOCBKZXJlbXkgTGludG9uIHdyb3Rl Ogo+Pj4+Pj4gSGksCj4+Pj4+Pgo+Pj4+Pj4gT24gMTAvNS8yMSAxMDozMiBBTSwgQmpvcm4gSGVs 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