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[80.56.215.227]) by smtp.gmail.com with ESMTPSA id af79cd13be357-93f56d9af50sm195498585a.8.2026.10.21.01.39.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 21 Oct 2026 01:39:12 -0700 (PDT) Message-ID: <40118d49-2e79-45c7-8e50-58e05a44d24d@broadcom.com> Date: Wed, 21 Oct 2026 10:39:06 +0200 X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: intel-iommu: DMAR PTE Read fault crash-loops a PCIe wifi device, v7.3-rc7 -> v7.3 final regression, reproduces on one unit out of five tested To: Jason Perlow , Baolu Lu , Aditya Garg , dwmw2@infradead.org Cc: iommu@lists.linux.dev, Bjorn Helgaas , linux-pci@vger.kernel.org, linux-wireless@vger.kernel.org References: <2c840dcf-4292-4579-a62d-f9766b7cb780@linux.intel.com> <74570358-8085-4767-BF76-D865CA95853E@gmail.com> Content-Language: en-US From: Arend van Spriel In-Reply-To: <74570358-8085-4767-BF76-D865CA95853E@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e Please respond inline. No top posting. On 21/10/2026 09:33, Jason Perlow wrote: > Yes, done. rc7 with intel_iommu=on on the same MacBookPro16,1 shows > the same fault: 95 DMAR faults, each followed by brcmf_fw_crashed, in > one boot. So no rc7 -> final regression in the IOMMU code. > > It is a v7.2 -> v7.3-rc1 regression in brcmfmac, from f0ba5fd51ff2 > ("wifi: brcmfmac: Set DMA direction for msgbuf packet IDs"). RX > buffers are now mapped DMA_FROM_DEVICE (prot 0x6, no IOMMU_READ) and > the BCM4364 firmware reads them: > > 36.512689 map iova=0xffeff2c0 size=2048 prot=0x6 (brcmf_msgbuf_rxbuf_data_post) > 41.110125 DMAR: [DMA Read NO_PASID] Request device [0000:05:00.0] fault addr 0xffeff000 [fault reason 0x06] PTE Read access is not set > 41.139317 brcmf_fw_crashed: Firmware has halted or crashed > > The fault comes before the crash. Before that commit the direction > stayed 0 (DMA_BIDIRECTIONAL). > > Thanks for the pointer. The only DMA related commit that I could think of was indeed the DMA direction change. Hope restoring DMA_BIDIRECTIONAL fixes it. Regards, Arend