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Wed, 29 Oct 2025 13:12:29 -0700 (PDT) X-Received: by 2002:a05:620a:44c5:b0:8a3:c4fa:9b75 with SMTP id af79cd13be357-8a8e30e42afmr645981185a.16.1761768748624; Wed, 29 Oct 2025 13:12:28 -0700 (PDT) Received: from [10.67.48.245] ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id af79cd13be357-89f261747efsm1093976585a.55.2025.10.29.13.12.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 29 Oct 2025 13:12:27 -0700 (PDT) Message-ID: Date: Wed, 29 Oct 2025 13:12:25 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 2/2] PCI: brcmstb: Add panic/die handler to driver To: Jim Quinlan , linux-pci@vger.kernel.org, Nicolas Saenz Julienne , Bjorn Helgaas , Lorenzo Pieralisi , Cyril Brulebois , bcm-kernel-feedback-list@broadcom.com, jim2101024@gmail.com Cc: Lorenzo Pieralisi , =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= , Manivannan Sadhasivam , Rob Herring , "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" , "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" , open list References: <20251029193616.3670003-1-james.quinlan@broadcom.com> <20251029193616.3670003-3-james.quinlan@broadcom.com> Content-Language: en-US, fr-FR From: Florian Fainelli Autocrypt: addr=florian.fainelli@broadcom.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e On 10/29/25 12:36, Jim Quinlan wrote: > Whereas most PCIe HW returns 0xffffffff on illegal accesses and the like, > by default Broadcom's STB PCIe controller effects an abort. Some SoCs -- > 7216 and its descendants -- have new HW that identifies error details. > > This simple handler determines if the PCIe controller was the cause of the > abort and if so, prints out diagnostic info. Unfortunately, an abort still > occurs. > > Care is taken to read the error registers only when the PCIe bridge is > active and the PCIe registers are acceptable. Otherwise, a "die" event > caused by something other than the PCIe could cause an abort if the PCIe > "die" handler tried to access registers when the bridge is off. > > Example error output: > brcm-pcie 8b20000.pcie: Error: Mem Acc: 32bit, read, @0x38000000 > brcm-pcie 8b20000.pcie: Type: TO=0 Abt=0 UnspReq=1 AccDsble=0 BadAddr=0 > > Signed-off-by: Jim Quinlan Reviewed-by: Florian Fainelli -- Florian