From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 AE22B7690B for ; Fri, 16 Feb 2024 11:28:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708082896; cv=none; b=ccGehVPuHBpBbIXzC/+b6fkNE00mQuXUbqSHqwL1Vs/ZF51wEjwk6uXCF9fSHBXVFhs92SxpIhlVgDJjQ4Q5hHTIhfIbFxeytBPPrEbyskLICiz8RefCHzd2igBhG4UfkyevQDdS09cF56JhvFXwkzvwZUJH5sgjrHWSGiHkZIc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708082896; c=relaxed/simple; bh=oXET3aKSI1V4rlsqHKZfh916aAs/mGOzF5YRdjv62+g=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=pRLk/+2KK2mk5f1/6gWQehW3k686KMij3/NcLuipdBn03DyXqowemi55filjSFT698QVCxZinFqOVq05ALBvXqTmA8sKwIzJvLAKk59b2He4yLdYxPiACOGfwAi8hh6xcm/5ah91Y4TGm0mj/KCVntZZuLAQvpGS0E6A2zdh9tQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EpK+aqx5; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="EpK+aqx5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9D131C433C7; Fri, 16 Feb 2024 11:28:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1708082896; bh=oXET3aKSI1V4rlsqHKZfh916aAs/mGOzF5YRdjv62+g=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=EpK+aqx53/vAA8CZ5UmPfM0Z+durlbBVOGFr1ph5cCcFydNq5QTkrY1zVt4Mq4Chn QYNbgkgxKdbRl/cosW8XwGi+6hvw6x61mW5HlZw00lJfVkRXaW+trYK49N0EPcHhN/ 4L9d9envi+nH5SAEm4w8+58AvS+eZ0vV9pvs1ODbhtOo0nD/06aoy98rsJNpXjvwlc VPlbBtgM7rxtXqykyi7msKiZWp0i96iACbHlnjEXtYYeqk5lv0Uu7WFJiWU/5yTXam td6MqK8IKkAJoKxPS1sdQ2xkBIL19gdvbc8k6F/6c6p/8TKoHH7hfjSvPD2IffzC/j D91yzyUJ/Wfeg== Date: Fri, 16 Feb 2024 16:58:08 +0530 From: Manivannan Sadhasivam To: Niklas Cassel Cc: Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Rob Herring , Bjorn Helgaas , Kunihiko Hayashi , Masami Hiramatsu , Manivannan Sadhasivam , Kishon Vijay Abraham I , Damien Le Moal , Frank Li , linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 2/2] PCI: endpoint: Drop only_64bit on reserved BARs Message-ID: <20240216112808.GE2559@thinkpad> References: <20240210012634.600301-1-cassel@kernel.org> <20240210012634.600301-3-cassel@kernel.org> 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=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20240210012634.600301-3-cassel@kernel.org> On Sat, Feb 10, 2024 at 02:26:26AM +0100, Niklas Cassel wrote: > The definition of a reserved BAR is that EPF drivers should not touch > them. > > The definition of only_64bit is that the EPF driver must configure this > BAR as 64-bit. (An EPF driver is not allowed to choose if this BAR should > be configured as 32-bit or 64-bit.) > > Thus, it does not make sense to put only_64bit of a BAR that EPF drivers > are not allow to touch. > > Drop the only_64bit property from hardware descriptions that are of type > reserved BAR. > > Signed-off-by: Niklas Cassel One nitpick below. With that addressed, Reviewed-by: Manivannan Sadhasivam > --- > drivers/pci/controller/dwc/pci-keystone.c | 2 +- > drivers/pci/controller/dwc/pcie-uniphier-ep.c | 2 +- > drivers/pci/endpoint/pci-epc-core.c | 7 ------- > include/linux/pci-epc.h | 4 ++++ > 4 files changed, 6 insertions(+), 9 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c > index b2b93b4fa82d..844de4418724 100644 > --- a/drivers/pci/controller/dwc/pci-keystone.c > +++ b/drivers/pci/controller/dwc/pci-keystone.c > @@ -924,7 +924,7 @@ static const struct pci_epc_features ks_pcie_am654_epc_features = { > .linkup_notifier = false, > .msi_capable = true, > .msix_capable = true, > - .bar[BAR_0] = { .type = BAR_RESERVED, .only_64bit = true, }, > + .bar[BAR_0] = { .type = BAR_RESERVED, }, > .bar[BAR_1] = { .type = BAR_RESERVED, }, > .bar[BAR_2] = { .type = BAR_FIXED, .fixed_size = SZ_1M, }, > .bar[BAR_3] = { .type = BAR_FIXED, .fixed_size = SZ_64K, }, > diff --git a/drivers/pci/controller/dwc/pcie-uniphier-ep.c b/drivers/pci/controller/dwc/pcie-uniphier-ep.c > index 265f65fc673f..639bc2e12476 100644 > --- a/drivers/pci/controller/dwc/pcie-uniphier-ep.c > +++ b/drivers/pci/controller/dwc/pcie-uniphier-ep.c > @@ -415,7 +415,7 @@ static const struct uniphier_pcie_ep_soc_data uniphier_pro5_data = { > .bar[BAR_1] = { .type = BAR_RESERVED, }, > .bar[BAR_2] = { .only_64bit = true, }, > .bar[BAR_3] = { .type = BAR_RESERVED, }, > - .bar[BAR_4] = { .type = BAR_RESERVED, .only_64bit = true, }, > + .bar[BAR_4] = { .type = BAR_RESERVED, }, > .bar[BAR_5] = { .type = BAR_RESERVED, }, > }, > }; > diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c > index 7fe8f4336765..da3fc0795b0b 100644 > --- a/drivers/pci/endpoint/pci-epc-core.c > +++ b/drivers/pci/endpoint/pci-epc-core.c > @@ -120,13 +120,6 @@ enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features > /* If the BAR is not reserved, return it. */ > if (epc_features->bar[i].type != BAR_RESERVED) > return i; > - > - /* > - * If the BAR is reserved, and marked as 64-bit only, then the > - * succeeding BAR is also reserved. > - */ > - if (epc_features->bar[i].only_64bit) > - i++; > } > > return NO_BAR; > diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h > index 4ccb4f4f3883..bb9c4dfcea93 100644 > --- a/include/linux/pci-epc.h > +++ b/include/linux/pci-epc.h > @@ -164,6 +164,10 @@ enum pci_epc_bar_type { > * should be configured as 32-bit or 64-bit, the EPF driver must > * configure this BAR as 64-bit. Additionally, the BAR succeeding > * this BAR must be set to type BAR_RESERVED. > + * > + * only_64bit should not be set on a BAR of type BAR_RESERVED. > + * (If BARx is a 64-bit BAR that an EPF driver is not allowed to > + * touch, then you must set both BARx and BARx+1 as BAR_RESERVED.) "then both BARx and BARx+1 must be set to type BAR_RESERVED." - Mani -- மணிவண்ணன் சதாசிவம் 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 E6AECC48260 for ; Fri, 16 Feb 2024 11:28:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; 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linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 2/2] PCI: endpoint: Drop only_64bit on reserved BARs Message-ID: <20240216112808.GE2559@thinkpad> References: <20240210012634.600301-1-cassel@kernel.org> <20240210012634.600301-3-cassel@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20240210012634.600301-3-cassel@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240216_032819_230874_33D362BA X-CRM114-Status: GOOD ( 26.23 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gU2F0LCBGZWIgMTAsIDIwMjQgYXQgMDI6MjY6MjZBTSArMDEwMCwgTmlrbGFzIENhc3NlbCB3 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