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[72.194.116.95]) by smtp.gmail.com with ESMTPSA id gj6-20020a17090b108600b0027ce34334f5sm6119653pjb.37.2023.10.23.18.13.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 23 Oct 2023 18:13:45 -0700 (PDT) Message-ID: Date: Mon, 23 Oct 2023 18:13:43 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] PCI: brcmstb: Avoid downstream access during link training To: =?UTF-8?Q?Pali_Roh=C3=A1r?= Cc: Lukas Wunner , Jim Quinlan , Nicolas Saenz Julienne , Lorenzo Pieralisi , Krzysztof Wilczynski , Rob Herring , Bjorn Helgaas , bcm-kernel-feedback-list@broadcom.com, linux-pci@vger.kernel.org, Philipp Rosenberger , Cyril Brulebois References: <385baf9dbfb6b65112803998dfc0cd6f84a5e6ba.1691296765.git.lukas@wunner.de> <20230806214338.7ylsi6aj6medp3us@pali> <39e96dd0-da7f-078e-d41d-fd437898744f@broadcom.com> <20230807071358.gaghhtoppj2w6ynx@pali> <20230807072848.6o5vevzwcba5xr6e@pali> From: Florian Fainelli Autocrypt: addr=florian.fainelli@broadcom.com; keydata= xsBNBFPAG8ABCAC3EO02urEwipgbUNJ1r6oI2Vr/+uE389lSEShN2PmL3MVnzhViSAtrYxeT M0Txqn1tOWoIc4QUl6Ggqf5KP6FoRkCrgMMTnUAINsINYXK+3OLe7HjP10h2jDRX4Ajs4Ghs JrZOBru6rH0YrgAhr6O5gG7NE1jhly+EsOa2MpwOiXO4DE/YKZGuVe6Bh87WqmILs9KvnNrQ PcycQnYKTVpqE95d4M824M5cuRB6D1GrYovCsjA9uxo22kPdOoQRAu5gBBn3AdtALFyQj9DQ KQuc39/i/Kt6XLZ/RsBc6qLs+p+JnEuPJngTSfWvzGjpx0nkwCMi4yBb+xk7Hki4kEslABEB AAHNMEZsb3JpYW4gRmFpbmVsbGkgPGZsb3JpYW4uZmFpbmVsbGlAYnJvYWRjb20uY29tPsLB IQQQAQgAyxcKAAG/SMv+fS3xUQWa0NryPuoRGjsA3SAUAAAAAAAWAAFrZXktdXNhZ2UtbWFz a0BwZ3AuY29tjDAUgAAAAAAgAAdwcmVmZXJyZWQtZW1haWwtZW5jb2RpbmdAcGdwLmNvbXBn cG1pbWUICwkIBwMCAQoFF4AAAAAZGGxkYXA6Ly9rZXlzLmJyb2FkY29tLmNvbQUbAwAAAAMW AgEFHgEAAAAEFQgJChYhBNXZKpfnkVze1+R8aIExtcQpvGagBQJk1oG9BQkj4mj6AAoJEIEx tcQpvGag13gH/2VKD6nojbJ9TBHLl+lFPIlOBZJ7UeNN8Cqhi9eOuH97r4Qw6pCnUOeoMlBH C6Dx8AcEU+OH4ToJ9LoaKIByWtK8nShayHqDc/vVoLasTwvivMAkdhhq6EpjG3WxDfOn8s5b Z/omGt/D/O8tg1gWqUziaBCX+JNvrV3aHVfbDKjk7KRfvhj74WMadtH1EOoVef0eB7Osb0GH 1nbrPZncuC4nqzuayPf0zbzDuV1HpCIiH692Rki4wo/72z7mMJPM9bNsUw1FTM4ALWlhdVgT gvolQPmfBPttY44KRBhR3Ipt8r/dMOlshaIW730PU9uoTkORrfGxreOUD3XT4g8omuvOwE0E U8AbwQEIAKxr71oqe+0+MYCc7WafWEcpQHFUwvYLcdBoOnmJPxDwDRpvU5LhqSPvk/yJdh9k 4xUDQu3rm1qIW2I9Puk5n/Jz/lZsqGw8T13DKyu8eMcvaA/irm9lX9El27DPHy/0qsxmxVmU pu9y9S+BmaMb2CM9IuyxMWEl9ruWFS2jAWh/R8CrdnL6+zLk60R7XGzmSJqF09vYNlJ6Bdbs MWDXkYWWP5Ub1ZJGNJQ4qT7g8IN0qXxzLQsmz6tbgLMEHYBGx80bBF8AkdThd6SLhreCN7Uh IR/5NXGqotAZao2xlDpJLuOMQtoH9WVNuuxQQZHVd8if+yp6yRJ5DAmIUt5CCPcAEQEAAcLB gQQYAQIBKwUCU8AbwgUbDAAAAMBdIAQZAQgABgUCU8AbwQAKCRCTYAaomC8PVQ0VCACWk3n+ obFABEp5Rg6Qvspi9kWXcwCcfZV41OIYWhXMoc57ssjCand5noZi8bKg0bxw4qsg+9cNgZ3P N/DFWcNKcAT3Z2/4fTnJqdJS//YcEhlr8uGs+ZWFcqAPbteFCM4dGDRruo69IrHfyyQGx16s CcFlrN8vD066RKevFepb/ml7eYEdN5SRALyEdQMKeCSf3mectdoECEqdF/MWpfWIYQ1hEfdm C2Kztm+h3Nkt9ZQLqc3wsPJZmbD9T0c9Rphfypgw/SfTf2/CHoYVkKqwUIzI59itl5Lze+R5 wDByhWHx2Ud2R7SudmT9XK1e0x7W7a5z11Q6vrzuED5nQvkhAAoJEIExtcQpvGagugcIAJd5 EYe6KM6Y6RvI6TvHp+QgbU5dxvjqSiSvam0Ms3QrLidCtantcGT2Wz/2PlbZqkoJxMQc40rb fXa4xQSvJYj0GWpadrDJUvUu3LEsunDCxdWrmbmwGRKqZraV2oG7YEddmDqOe0Xm/NxeSobc MIlnaE6V0U8f5zNHB7Y46yJjjYT/Ds1TJo3pvwevDWPvv6rdBeV07D9s43frUS6xYd1uFxHC 7dZYWJjZmyUf5evr1W1gCgwLXG0PEi9n3qmz1lelQ8lSocmvxBKtMbX/OKhAfuP/iIwnTsww 95A2SaPiQZA51NywV8OFgsN0ITl2PlZ4Tp9hHERDe6nQCsNI/Us= In-Reply-To: <20230807072848.6o5vevzwcba5xr6e@pali> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000001924d06086c0df1" Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org --00000000000001924d06086c0df1 Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 8/7/2023 12:28 AM, Pali Rohár wrote: > On Monday 07 August 2023 09:13:58 Pali Rohár wrote: >> On Sunday 06 August 2023 19:48:59 Florian Fainelli wrote: >>> On 8/6/2023 2:43 PM, Pali Rohár wrote: >>>> On Sunday 06 August 2023 06:44:50 Lukas Wunner wrote: >>>>> The Broadcom Set Top Box PCIe controller signals an Asynchronous SError >>>>> Interrupt >>>> >>>> This is little incorrect wording. PCIe controller cannot send Async >>>> SError, this is ARMv8 specific thing. In this case PCIe controller is >>>> connected to ARM core via AXI bus and on PCIe transaction timeout it >>>> sends AXI Slave Error, which then ARMv8 core reports to kernel as Async >>>> SError interrupt. >>> >>> That is indeed a better way to explain the issue. FWIW, on BCM2711 the PCIe >>> core connects via SCB and then AXI towards the ARMv8 CPU, does not change a >>> thing about your paragraph. >> >> Ok, it is better describe the issue correctly. >> >>>> >>>> The proper fix is to configure PCIe controller to never send AXI Slave >>>> Error and neither AXI Decode Error (to prevent SErrors at all). For >>>> example Synopsys PCIe controllers have proprietary hidden configuration >>>> bits for enabling/disabling this AXI error reporting behavior. >>> >>> That does not exist with the version of the block present in BCM2711 >>> unfortunately. >> >> I was expecting such answer. I think that we have been discussing this >> issue privately more months ago. >> >>>> >>>> Or second option is to access affected memory from the ARMv8 core via >>>> synchronous operations and map memory as nGnRnE. Then ARMv8 core reports >>>> AXI Slave Error as Synchronous Abort Exception which you can catch, >>>> examine that was caused on PCIe memory region and fabricate all-ones >>>> response. But the second option is not available for some licensed ARMv8 >>>> Cortex cores (e.g. A53) as they do not implement nE (non Early Write >>>> Acknowledgement) memory mapping correctly. >>> >>> BCM2711 uses Cortex-A72 do these cores still not implement nE correctly? Do >>> you have a reference backing up that claim (not disputing it, just curious). >> >> I remember that I read this in Cortex-A53 documentation. Let me find it. >> >> It is here: >> ARM Cortex-A53 MPCore Processor Technical Reference Manual r0p3 - Support for v8 memory types: >> https://developer.arm.com/documentation/ddi0500/e/level-1-memory-system/support-for-v8-memory-types >> >> "nGnRnE - Treated the same as nGnRE inside a Cortex-A53 processor" >> >> So really, disabling Early-acknowledge has no effect on A53. >> >>>> >>>> The patch below does not fix the issue at all, instead it opens a new >>>> race condition that if link state is changed _after_ the check and >>>> _before_ accessing config space. >>> >>> Fair enough, but in the situation you describe there is not much that can be >>> done anyway so we might as well deal with a narrowed window? >> >> Unless there is hidden/proprietary/undocumented bits for PCIe controller >> to disable generating AXI errors, or ability to use only synchronous >> access to affected memory from ARM core (e.g. by nE) there is really not >> much what can be done here. I can just say that this is badly designed HW. >> >> One more thing, if I remember correctly, ARMv8 specifies that Syndrome >> register which delivers SError has some bits reserved for optional >> feature - target AXI slave id which sent AXI Error. A53 does not >> implement it and I highly doubt that other licensed ARM cores have them. >> But maybe you could check A72. But even with that I'm really not sure if >> it could be possible to catch SError, detect that it was sent by AXI >> slave corresponding to PCIe controller and ignore it. >> >>> Thanks for reviewing. >>> -- >>> Florian > > One more idea. Does platform have some DMA controller? If yes, maybe it > could be possible to completely avoid access to that affected memory > from ARM core and instead access its content via DMA controller? DMA > controller could be better and does not signal slave errors as SError to > ARM core. Looks like I never got back to you on that, yes 2711 has 15 programmable DMA controllers (drivers/dma/bcm2835-dma.c) which could be an option here, though since the PCIe bridge is supposed to be transparent, I am not sure how we could hook it in into memory cycles? Would not that require faulting (from a MMU perspective) on the PCIe outbound window to then go and kick off the DMA engine to transfer data around? -- Florian --00000000000001924d06086c0df1 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQeQYJKoZIhvcNAQcCoIIQajCCEGYCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3QMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS MyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA vbCmXCcsbZ/a0fRIQMBxp4gJnnyeneFYpEtNydrZZ+GeKSMdHiDgXD1UnRSIudKo+moQ6YlCOu4t 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