From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7C905C433F5 for ; Tue, 4 Oct 2022 11:59:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=q9Q5YYFl47BA5Pw7MgYbStEqDiTaJxdKrN2FCG3Rg8U=; b=RW8oh0jxPYvGTI0gLi+Tgs8LOV LY9hzwcUW7CuKEv++F64j+V7IHD/PihZQPAPyWCptsN5gSvWPfhkaMaVd68iWnqlyEI9SuFD97bBB 0pmDQDKu3spbnCl+bQipcxta3qRhtA7G4RgIocc22cwNu4yzUYuPZktvkQJHy0Ue0mHguXZVD0vey kVKBBsC17PHDwQz6yZ8GBfa33n6lIML8kO+tUZZ6GmugqZuJaHc2DgBv/V9Z/nd62CNV4hfV4dF3l hRH+14wk7pyuNOAqR7phjDlR7norHG6/6M4Eoh6OP5px5Bx6HqtuyvurruZMqHgwxgmN56N3JUtso ONCth01g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1ofga2-009Z93-Bv; Tue, 04 Oct 2022 11:59:22 +0000 Received: from madras.collabora.co.uk ([2a00:1098:0:82:1000:25:2eeb:e5ab]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1ofgZs-009Z7b-5y; Tue, 04 Oct 2022 11:59:13 +0000 Received: from [192.168.1.100] (2-237-20-237.ip236.fastwebnet.it [2.237.20.237]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: kholk11) by madras.collabora.co.uk (Postfix) with ESMTPSA id 5F4906602295; Tue, 4 Oct 2022 12:59:06 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1664884747; bh=uWR6mifATwteDavwCYtlxjjRbJpEMopbvXmtwSS2OCQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=Kq2BHPr/TE+jy8XuU//QuqFoBiSGP8RiW/xByTgtQFcxLoi+FPmUajL9kfUuAl3+1 burnOiFauGGEpDWs8p3i3FP2mesx3VBbSJrwzAHQTrLMIQPTwud5Jmi2pvir1o1nQo 4H6MZWMqhbHPIStZ4KJCiaaaRdJgwbxGYFbSzd72KHjt461LyuqSXJRMRYk9/zg4Pu nI/sLAlB0ldcJ8BsLQ0fL3OsWtyggrsV8z5y1tzqvXlzXDfEMCEuhFZZ9tiv21CZib 1sPKezcJN9qvGO3ImopbxGg5BP+mHCARfzEjNuoQdlN8U8vx8g6agChV4A+o8fnewt f/pNZi2wasI1g== Message-ID: <7d37e6ae-0dca-e0ef-2841-298c1ba9784f@collabora.com> Date: Tue, 4 Oct 2022 13:59:04 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.0 Subject: Re: [PATCH v2 2/3] iommu/mediatek: add support for 6-bit encoded port IDs Content-Language: en-US To: Alexandre Mergnat , Rob Herring , Yong Wu , Matthias Brugger , Will Deacon , Joerg Roedel , Robin Murphy , Krzysztof Kozlowski Cc: linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Fabien Parent , Markus Schneider-Pargmann , Amjad Ouled-Ameur , devicetree@vger.kernel.org, iommu@lists.linux.dev References: <20221001-iommu-support-v2-0-dbfef2eeebc9@baylibre.com> <20221001-iommu-support-v2-2-dbfef2eeebc9@baylibre.com> From: AngeloGioacchino Del Regno In-Reply-To: <20221001-iommu-support-v2-2-dbfef2eeebc9@baylibre.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221004_045912_399858_4751FF94 X-CRM114-Status: GOOD ( 16.93 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org Il 04/10/22 12:01, Alexandre Mergnat ha scritto: > From: Fabien Parent > > Until now the port ID was always encoded as a 5-bit data. On MT8365, > the port ID is encoded as a 6-bit data. This requires to rework the > macros F_MMU_INT_ID_LARB_ID, and F_MMU_INT_ID_PORT_ID in order > to support 5-bit and 6-bit encoded port IDs. > > Signed-off-by: Fabien Parent > Signed-off-by: Markus Schneider-Pargmann > Signed-off-by: Alexandre Mergnat > --- > drivers/iommu/mtk_iommu.c | 24 ++++++++++++++++++++---- > 1 file changed, 20 insertions(+), 4 deletions(-) > > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c > index 5a4e00e4bbbc..a57ce509c8b5 100644 > --- a/drivers/iommu/mtk_iommu.c > +++ b/drivers/iommu/mtk_iommu.c > @@ -108,8 +108,10 @@ > #define F_MMU_INT_ID_SUB_COMM_ID(a) (((a) >> 7) & 0x3) > #define F_MMU_INT_ID_COMM_ID_EXT(a) (((a) >> 10) & 0x7) > #define F_MMU_INT_ID_SUB_COMM_ID_EXT(a) (((a) >> 7) & 0x7) > -#define F_MMU_INT_ID_LARB_ID(a) (((a) >> 7) & 0x7) > -#define F_MMU_INT_ID_PORT_ID(a) (((a) >> 2) & 0x1f) > +#define F_MMU_INT_ID_LARB_ID(a, int_id_port_width) \ > + ((a) >> (((int_id_port_width) + 2) & 0x7)) > +#define F_MMU_INT_ID_PORT_ID(a, int_id_port_width) \ > + (((a) >> 2) & GENMASK((int_id_port_width) - 1, 0)) I can't think about any cleaner way than this one, but that's decreasing human readability by "quite a bit". The only way you can keep it readable is by adding a comment before these macros that explains the sub-fields of FAULT_ID, located in the INT_ID register: please add that. Regards, Angelo