From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=95.215.58.26 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792603684; b=j19W5TY657aHHOxOgYNaWYmaI/Mi/oWqifZRcOqDJSjsfSTFcv/mx7iPRUyu33DocPD2 8gs1nnGIzzDl2xreVJ6Yz5e2BwQ6LpdKrMeq9Zqco5m3KjM8v8xKSViZFa4saU+elQUba VSmpNcX3CMV0nJ5mw48/1OEHtUr61rDxp8DjbAzk31Z5hPWO3sOjAWBjy9I2Txq3CSjDp fDS7SU8GbBVXH/KzHA2/cGRf4RKv0gVwa2GksqjQIFqXru+OLn17vZeU6hjLnZtd7lHcT CePFpuWDlfOJZcj6XG0qPbDio26X5ZhMAS08CNu/KCQffAWZ8qo4vcidHWQtsR4gsuQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792603684; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:Message-ID:Date:MIME-Version:User-Agent: Subject:To:Cc:References:Content-Language:From:In-Reply-To: Content-Type:Content-Transfer-Encoding; bh=QyTwK1bJaEhML32mAdjqWfcv9dKI6fIKk2BTqmlpHy0=; b=XyGIu/9dTQgVJzn22O4OrF/dM1xmdZuU2N5XrD0KROKxvfLgddNV2fgg5HwZk+KEeV8x goAeDZF1CmToHYpJagIDscG3AKyRHvmfYlcGAenUNS9jrfpYaVqBYyjE4S/3T4r5GACwP Z/9TEIhdYrPhIGdO16n9izphlwiNaUo9aUCrFANTD5J7Y20WNxhsBv4i3Jk/qtGKh4oId ZFo8HpqkWps3/SLJIspC6cPWDtr/XG0vf7pbBMssAIGQT6vnTiKFw3x8L/ylqDtVbWkWP FXnNhXcZbDAX+IDKINGnlbDSooTTTE/XuZnX6IIOqqunayLO5Ieu1Wi4zs2H6bB/GtQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=m5ijV6sx; arc=none smtp.remote-ip=95.215.58.26 Received: from mta1.migadu.com (out-26.mta1.migadu.com [95.215.58.26]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5D366606A324 for ; Wed, 21 Oct 2026 17:28:02 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 5D366606A324 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=m5ijV6sx X-Envelope-To: linux-wireless@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=ciscCx144xO9gJ+sXlyrNhAmAkKLhcAfZhaVrPjiP4Q=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1792603681; v=1; x=1793208481; b=m5ijV6sxWwzADk3TdXJL6HkpQBxXOSz7tACjt212+ZMeh+CYUzKgwqnKyJXhtixFbrMnhwyO h//vxx3rvlx8pWRhVOBKm5sdhwLowEWxRAAS33jE7ILQDXXPIXUJwXklaqZcqgtq5cFXoNalbsW 5tlnBdUKuYLHO2Cs25AJs2Nk= X-Envelope-To: linux-wireless@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id dbad4ac4184ccfc0; Wed, 21 Oct 2026 17:28:01 +0000 X-Mizu-Trace-ID: dbad4ac4184ccfc0 X-Migadu-Flow: FLOW_OUT Message-ID: <428ba501-e6ce-4be1-b4cd-adaba4c0c12a@linux.dev> Date: Wed, 21 Oct 2026 22:57:54 +0530 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 , Arend van Spriel , Baolu Lu , dwmw2@infradead.org Cc: iommu@lists.linux.dev, Bjorn Helgaas , linux-pci@vger.kernel.org, linux-wireless@vger.kernel.org, johannes@sipsolutions.net References: <2c840dcf-4292-4579-a62d-f9766b7cb780@linux.intel.com> <74570358-8085-4767-BF76-D865CA95853E@gmail.com> <40118d49-2e79-45c7-8e50-58e05a44d24d@broadcom.com> <1a15f52cf68.2873.9b12b7fc0a3841636cfb5e919b41b954@broadcom.com> <20F90036-F53C-4490-B27A-DFD055DB22E8@gmail.com> Content-Language: en-US From: Aditya Garg In-Reply-To: <20F90036-F53C-4490-B27A-DFD055DB22E8@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/21/26 10:34 PM, Jason Perlow wrote: > > > >> >> I would prefer the above in proper patch, but it's up to Johannes. >> >> Regards, >> Arend >> >> >> > Patch below. > > -- >8 -- > Subject: [PATCH] wifi: brcmfmac: map msgbuf RX packet IDs bidirectional > > Commit f0ba5fd51ff2 ("wifi: brcmfmac: Set DMA direction for msgbuf > packet IDs") maps the RX packet ID buffers DMA_FROM_DEVICE. The > BCM4364 firmware also reads posted RX buffers, so with VT-d > translation enabled every such read faults ("PTE Read access is not > set") and the firmware crashes and resets in a loop. > > Map the RX pool DMA_BIDIRECTIONAL again, as before that commit. TX > keeps DMA_TO_DEVICE. > > Fixes: f0ba5fd51ff2 ("wifi: brcmfmac: Set DMA direction for msgbuf packet IDs") > Cc: stable@vger.kernel.org > Tested-by: Jason Perlow > Signed-off-by: Jason Perlow > --- > drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c > index 069ba70..ff47d48 100644 > --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c > +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c > @@ -1639,7 +1639,7 @@ int brcmf_proto_msgbuf_attach(struct brcmf_pub *drvr) > if (!msgbuf->tx_pktids) > goto fail; > msgbuf->rx_pktids = brcmf_msgbuf_init_pktids(NR_RX_PKTIDS, > - DMA_FROM_DEVICE); > + DMA_BIDIRECTIONAL); > if (!msgbuf->rx_pktids) > goto fail; > I've submitted this patch properly here: https://lore.kernel.org/linux-wireless/20261021172238.10004-1-aditya.garg@linux.dev/T/#u