From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from fhigh-b8-smtp.messagingengine.com (fhigh-b8-smtp.messagingengine.com [202.12.124.159]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 82F6D4A2A40 for ; Sat, 10 Oct 2026 14:28:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.12.124.159 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791642545; cv=none; b=Z+l4d+2/nk2pl2KiAsK2lesDodQtpoj5rsbCMWZTiV3jxBsPhfFIf5YB57WpN8ozYP4HNrR1WtbZDFnUSNY57+H9zB72w2VlELdufObd6Wr9iDOeXyAoWH/2/V9XSh7zUuc4Dn7TSe0HNKm5MYRlPJR1FCnonbs2p5lLprQOxZg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791642545; c=relaxed/simple; bh=9yZoRXmQQtglkDC69zeTXeUUkPPxdHTFbXEWw2qChQk=; h=MIME-Version:Date:From:To:Cc:Message-Id:In-Reply-To:References: Subject:Content-Type; b=GWIuE7crfPiOdzT2yBRGlayLCMzfrDLJZHNPrzdz2IIWXwAp2LqHLGDIua2AgndsK3suuhyjIdR+1tYQVkm1OZkyKYOxVtDB3RI4K6T4WWsoVVvfQpiTI/hbPL3vCGslE2TbwlDHwp2TdpaBFlflZofYx//aVZ29RIlaA15qGfQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arndb.de; spf=pass smtp.mailfrom=arndb.de; dkim=pass (2048-bit key) header.d=arndb.de header.i=@arndb.de header.b=jFWomILQ; dkim=pass (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b=sPU0NwE1; arc=none smtp.client-ip=202.12.124.159 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arndb.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arndb.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=arndb.de header.i=@arndb.de header.b="jFWomILQ"; dkim=pass (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b="sPU0NwE1" Received: from ams-compute-02.internal (ams-compute-02.internal [10.64.2.62]) by mailfhigh.stl.internal (Postfix) with ESMTP id 9BEA37A0090 for ; Sat, 10 Oct 2026 10:28:58 -0400 (EDT) Received: from ams-imap-03 ([10.64.2.23]) by ams-compute-02.internal (MEProxy); Sat, 10 Oct 2026 10:28:58 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arndb.de; h=cc :cc:content-transfer-encoding:content-type:content-type:date :date:from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:subject:subject:to:to; s=fm1; t=1791642533; x=1791728933; bh=9v+bgPkySBzc0aLhhX4V+5q7OxZcccocW4BaJrDdLNA=; b= jFWomILQ5a23kATKxV5opHvM6kxextElXZNIoC5bV5Kd9IuRR/QlKjpx0lZ+Dzmq sCB+9MDrSkClNP2VC5yF1n8F9TSfBkLlys7Wu8bDS71XK648H5QuH/+Pxnz+SYVU DZ1dEdS4+I7AagBW24ENQ0T1AnkyKVXm+aqvitC8m1KVNbpTZXgXNzTc7zHrfhQp W1I6v0HDPp8V58qJBef2shx9cQvbo0RC6hEMtPLz5pJGSzgVY8hnmEHMuG9TAfYD xrdhYw9t6gELVazbbwdvOnPcf/xKiMyvnUpEU86nD4CmTLwN163L5kZOZ3y3jjbp fwPxFcLthyJlq8TspW5Nhw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type:content-type:date:date:feedback-id:feedback-id :from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:subject:subject:to:to:x-me-proxy :x-me-sender:x-me-sender:x-sasl-enc; s=fm2; t=1791642533; x= 1791728933; bh=9v+bgPkySBzc0aLhhX4V+5q7OxZcccocW4BaJrDdLNA=; b=s PU0NwE17zIyVoH4vRdF06XvdJJ9o4RoMUHru7INjE0f87mtHAeO/MBk2c0XvNZWh R2Hn3pzkxaNMUHcBrPbq7+JU/9IBTKkwB9VyJZ2SScLzQxMmKG/oRwBcPQn9SHtC fuOUr0vKI5MH2/oXdGEgARDat+FefA9aYWO05ZnEdr5HDv2bpngpsbBtVlBLggRs 8MlmeMlcor70aes4jtGOkhILxg5wSG52Pdw+ko3nOAxHH14lxWv0VMYJaRx9bNAb 9IW4jlbCn+8R/Hv75Bme8ht9T9VT6YCEIgLZl7Z2nC7wkMEuMQLBbrcr5Ti3fd8i lVzrLz6GYNGWQS8dSTuFQ== X-DKIM2-Info: draft=ietf-dkim-dkim2-spec-06; repo=github.com/dkim2wg/interop; date=2026-10-04; sw=lmtpprox; action=sign d=arndb.de a=rsa-sha256; DKIM2-Signature: i=1; m=1; t=1791642533; d=arndb.de; mf=PGFybmRAYXJuZGIuZGU+; rt=PGxpbnV4LWtlcm5lbEB2Z2VyLmtlcm5lbC5vcmc+; s=fm1:rsa-sha256:XYNY23RjHw1rLdBpSMh+Su0iltSOkJ2XE0wn/dRXzYaMZ5A R+5sg+pxSNUMeaiM2ixHKiXzpAst7MluaId9+jAHmM+TIDByRG62oOOI+TrfSs0A L7e4Hf2dh+j34hqz5nZNrUyI4ZsVaOJ7y9Wn3wquKVce/Q+30xnCckpqCRgW9641 lnmr8lyZZes9hWW8k7HE1jetMDdiP1TyRrRpOBZt8yzvW+k0ctyW0zYqYriNho0w 2zaOwW9a7aonLCAmJIVcfPE0JJltZkvkIVB9CMrPRFD/gIdZXMTIUbLxJdd7ZLlI t2K9Eh2rkxjPPWo5fcoxE082QHMa0pHDUTKftAQ==; X-DKIM2-Info: draft=ietf-dkim-dkim2-spec-06; repo=github.com/dkim2wg/interop; date=2026-10-04; sw=lmtpprox; action=mi-m=1; hc=12; hn=cc,content-transfer-encoding,content-type,date,feedback-id, from,in-reply-to,message-id,mime-version,references,subject,to; Message-Instance: m=1; h=sha256:aV/xq7C55QCQ+urKH1wwNiqvUZ1gUoGK8FiRVFhcd4E=:9yZoRXmQQtglkDC69zeTXeUUkPPxdHTFbXEWw2qChQk=; X-ME-Sender: X-ME-Proxy-Cause: dmFkZTFLAfDTpiHknNrFYZyTXrnw2i7hwBBvDA63p8pgRb0WqT4uwmaQRp4EGcR7ukfzJZ f5CIWh9gOF/Amyiux4ODBvMo61U3Jc3UVC5GH6RgDDma1/7U3/zzszVYlVvovFRGCIWGfw eR0FSHRyq4KfzGqSx38fm4/+TW33xsPGI0rRkMb8YT6JNiQiB0og8o6tMyILtVOpdB9RB0 zL63lotg/Pa36txTSqrKwJsHfmQOBBnEV+R4n5wWq6ZzX4w2ZfLeDfVp9XMY/u31sGf8Gs Whd8/WU38AX11634PqkCCV1/inETB5YkcD7XCwm1ixzjvsWeZGHscx93x8ujbNSijxNinv u75MzmtoXKTjx0uYl2UonLYOjm9KuibX5/QW+3j1SPnStE6injzas1NPUy5IjKbmSuJQFA tp0f+a353JAcAO1vvtgeNXIZgxzNy0oFndBlHzwws0BdrSJUtVsMAo+PDsMaa6+6ixeUnS KP+USiRioKp1FxX+T30cSsenqYrbTyrooIyngSwlyzxVoP2KQGwhfqmOnaAbsaahHBbZ3l 5/Fqrxg5RMkmgsFuUSN1yduGzA7KAlLpo3lQb0Y/onn2Gf4Vd2KNcGNdlJ3IcpAti2qnzN 9PlzKsKehkw9K2vPJ2iJrAV/ELh0VNLY+3xIpl7IBCMt6kDO44LlSaAc2biA X-ME-Proxy: Feedback-ID: i56a14606:Fastmail Received: by mailuser.ams.internal (Postfix, from userid 501) id 4017232A008E; Sat, 10 Oct 2026 10:28:50 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: A-dXEK1mihoo Date: Sat, 10 Oct 2026 16:28:29 +0200 From: "Arnd Bergmann" To: "Navid Ghahremani" , linux-arm-kernel@lists.infradead.org Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, "Russell King" , =?UTF-8?Q?Stefan_D=C3=B6singer?= , "Rob Herring" , "Krzysztof Kozlowski" Message-Id: <5e78f63b-9479-49d9-8474-fa408135f325@app.fastmail.com> In-Reply-To: <20261010130024.177503-3-ghahramani.navid@gmail.com> References: <20261010130024.177503-1-ghahramani.navid@gmail.com> <20261010130024.177503-3-ghahramani.navid@gmail.com> Subject: Re: [PATCH 02/24] ARM: l2c: Serialize device reads with cache maintenance when requested Content-Type: text/plain Content-Transfer-Encoding: 7bit On Sat, Oct 10, 2026, at 14:59, Navid Ghahremani wrote: > Provide the optional lock used by the tested ZX279128S workaround. Lock- > off experiments hung the board; the proposed API remains subject to > maintainer review. > > Assisted-by: LLM > Signed-off-by: Navid Ghahremani Hi Navid, This seems like a very invasive change and at the same time does not look generic enough as it requires changes to each driver behind the PCIe bus. Please describe how you ended up with this version, did you copy the from the vendor BSP (where?) or did you arrive here by trial-and-error? This looks related to the CONFIG_OUTER_CACHE_SYNC workaround, though I can't tell whether that means it should be connected to that, or if the actual symptom you see may be caused by that workaround. Do you have any more information here? Does the problem appear both with arm,outer-sync-disable enabled and disabled? Arnd