From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 CC8A8484226; Thu, 23 Jul 2026 15:43:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784821383; cv=none; b=oqFget+Rp23AOcWFX5HoRrPVo4YAZEKhTLR8UmLQJeI6mOczoMeOF1/W5TxnpPZkwx9rasM12hbbEfOTDmGwESQUOHJWzlIqaaBqQo2tS7jYpXlwPEfuIynbCrTzTDLY+q9hMnIEMms5fjgtj1eiZdil7U/zIXzRtCLrwvlnpe8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784821383; c=relaxed/simple; bh=TbXFmKnPNo5liikiI4EUCChJabUDizkRWYhMw0C6YUk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=D/sW+ck+ekaVjT3z5N/EVEPfB9nZicHv8ZEX6QzAbNW3eK+msZMNb0jd4GZl9Ibw97rIJKvRMna+F6NtIL1vCdCafbotrdF2FKA2ld9qZhbShPq8G6IhNiNF5ZZecZWWhZWV7EIwjKVHDuW9eZW5tDyZJzJpZOJmsjKoTsfydNc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QbrEjISG; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="QbrEjISG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 09AB61F00A3A; Thu, 23 Jul 2026 15:43:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784821381; bh=K1AUQhkmXgUeaGNZXdQbMe6bRsXKyMwD1ceV8FwR7z0=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=QbrEjISGP0XyZIWNp9dnUd1EKp2YmUvdpYfZzQSoaKb0F8McodDFtTx07WvB6HF+h pkN8DOUzIXbk+6/dYDBnxRkEVbV4yao7e2BcHSNiaOJeT7EbkjRE9aM1b3Qkl46wvs aHR/cIJU+bHLB4icNmrzuvwatyCnfpJ04s8Bbd2Ze8sqRcYBS9p8N6Opi/Y3oaLSE6 uf4/nVeYCuhfKYDecpYgXYUKyR6+woiZPIYCcGqXWRRgBnCepc6fU+K1geUnFeHzgC DO9c7+ph6mahC/7dCnPehpQoMN0h7sDT/mY+qLJ+fzIpaHhR31vL/y3Qe0aQr96Cgb ijH83RQg8yNJw== Date: Thu, 23 Jul 2026 10:42:59 -0500 From: Bjorn Helgaas To: Vasant Hegde Cc: iommu@lists.linux.dev, joro@8bytes.org, linux-pci@vger.kernel.org, will@kernel.org, robin.murphy@arm.com, suravee.suthikulpanit@amd.com, bhelgaas@google.com, alexander.deucher@amd.com, mario.limonciello@amd.com, jgg@ziepe.ca Subject: Re: [PATCH 1/2] PCI: Mark Radeon Pro WX 4100 ATS as broken Message-ID: <20260723154259.GA836122@bhelgaas> References: <20260723061548.10187-1-vasant.hegde@amd.com> <20260723061548.10187-2-vasant.hegde@amd.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260723061548.10187-2-vasant.hegde@amd.com> On Thu, Jul 23, 2026 at 06:15:47AM +0000, Vasant Hegde wrote: > If ATS is enabled then IOMMU logs below error and GPU fails to > initialize. > > [ 103.687137] iommu ivhd0: AMD-Vi: Event logged [IOTLB_INV_TIMEOUT device=0000:c4:00.0 address=0x1080006060] Is this a published erratum? Is there enough benefit to using ATS to make it worthwhile? It would have to be a pretty substantial benefit to outweigh the end-user frustration of defects like this. If ATS isn't going to be validated by vendors, maybe we should disable it on all AMD/ATI devices? Or maybe only the GPUs? > Suggested-by: Alex Deucher > Cc: Bjorn Helgaas > Cc: linux-pci@vger.kernel.org > Signed-off-by: Vasant Hegde > --- > drivers/pci/quirks.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c > index b09f27f7846f..d55657347d88 100644 > --- a/drivers/pci/quirks.c > +++ b/drivers/pci/quirks.c > @@ -5686,6 +5686,8 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x7340, quirk_amd_harvest_no_ats); > DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x7341, quirk_amd_harvest_no_ats); > DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x7347, quirk_amd_harvest_no_ats); > DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x734f, quirk_amd_harvest_no_ats); > +/* Radeon Pro WX 4100 */ > +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x67e3, quirk_amd_harvest_no_ats); > /* AMD Raven platform iGPU */ > DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x15d8, quirk_amd_harvest_no_ats); > > -- > 2.31.1 >