From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f173.google.com (mail-pf1-f173.google.com [209.85.210.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DF4EB1D47A0 for ; Fri, 15 Nov 2024 16:36:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731688565; cv=none; b=UVPAWlq4paFqaew9Hcw8yC6sTM226krTfDddEJujB09KrATBvCmEJd/uKwUjm99rRpgz2uKACOnpUNg66m3gMKoF9O7TKs+8I6byakpsPOIMdsHXzzdpHPlx4ixv+Dy2FfFwLgPHmEcHYLu5Kxmxz8ufIhcwbCjitL/uUp0Iqjw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731688565; c=relaxed/simple; bh=F0dKwfWND9Cr158pJFNX+LI79Kd6IcQezYwh3JmGItg=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=QX4U11Ld78ym4YxoKirR/LJWAhV2cVP/j5+u0gk/6e8Ef+c7BjxqJVa3FIjlPsASmmVOrT7NW/F2N1ExtVFBMbx48WrXdhlcjUvjHPGKC785AAATjxwxJaNJol+Cgsg/QPkeZiT+sGjB1b3btNQjxg7XmQUjnDCM0Nv6AiX2uno= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=b2ZHp1oz; arc=none smtp.client-ip=209.85.210.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="b2ZHp1oz" Received: by mail-pf1-f173.google.com with SMTP id d2e1a72fcca58-72061bfec2dso1611449b3a.2 for ; Fri, 15 Nov 2024 08:36:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1731688563; x=1732293363; darn=lists.linux.dev; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to; bh=A1rLKs7XMafDwKPJur3KVVVuDZ+Nk4nB0R3fvhHVGOI=; b=b2ZHp1ozzlfex1k9GpXpCcfSpQ+6kVGW7DIYKtZCWCQNi+ZqVyzLRQ476jPC3nnuNf V+P7yWznJIpyxFVA13Hg6sWAUS4JiIfY4uv9zixX8D+K1GndyvqT0PMn7xKWamgXpR4U gATGTIJvB3WD/sJ9sNcQDZTbxac23NOy1/IZOZSI/uoZSpOWq0iUFoj4JiOO6+GKijxl u6tKAVhB6L9tDLuhKLL8tGNQzDe0vJp4PE2MpX3X8rQqmKFVktW6DzUYrwgyIBTdQh5Z ozjkzLeYzAhQ7nStgeroswj8CaPCB8rqVKXfDsGI2UZUX+ynaUBgQi76zrRqJVulzlup G0nw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731688563; x=1732293363; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=A1rLKs7XMafDwKPJur3KVVVuDZ+Nk4nB0R3fvhHVGOI=; b=Wq4HxONuYSc0Pw7uy+x48K7KT9cgcW+75Nye9dDwAwmw7MjOheHD4iRDWK+tivZtmt dWPog2CIURNaaQWX8ineL/zti5Wvn/YePhNtcpe5wNBs/UT7cPEZ7PYOxG+ctx0cUwfS xruN0BPR+zs0pX6Ihl4YMoOdTk5d/oBsHWcVtQ2kLJKFvWaohy87RcP7RzCMdxFzOZ8T xMT/sEr1Qx4xYL1aDz9D3CloCJ86OnF01QAZv3bIBvGrgOeINchcjkMvhgSQH636da7r VQ8aG80Wdzl0dQ94lhTFT+bu1qLol2v7Vp221NPv70fPblA8NQHIdy093Jje1K98mKKq CevQ== X-Forwarded-Encrypted: i=1; AJvYcCUSSwHN+YrB4keEEbSaaeGK7z7z5S/evTuQfI0eON73Vr/rjBpmwjQDGruGISjzdlsHu10=@lists.linux.dev X-Gm-Message-State: AOJu0YwBuOrsmSNnuYxy7SqYct8XOy2VpBbNlxXAUdDp46UzDlBdZbO7 miS8TqxZHw1krFg1M2zrifmDXALcNF4AOeK8/KG++ivehV+tzOxVl5mP+ybgRQ== X-Google-Smtp-Source: AGHT+IGFnW6rFMw+hHUnNFuHyJmsLi6k9X5/Gsoh1t7i3szUhNuaPDcIgnR8yPSEXL5+AmJiguW+3g== X-Received: by 2002:a05:6a00:b56:b0:71d:fb29:9f07 with SMTP id d2e1a72fcca58-72476bba9femr3943662b3a.15.1731688563135; Fri, 15 Nov 2024 08:36:03 -0800 (PST) Received: from thinkpad ([117.193.215.93]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-724771e8ad1sm1533972b3a.168.2024.11.15.08.35.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Nov 2024 08:36:02 -0800 (PST) Date: Fri, 15 Nov 2024 22:05:52 +0530 From: Manivannan Sadhasivam To: Frank Li Cc: Rob Herring , Saravana Kannan , Jingoo Han , Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Bjorn Helgaas , Richard Zhu , Lucas Stach , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, imx@lists.linux.dev Subject: Re: [PATCH v7 1/7] of: address: Add parent_bus_addr to struct of_pci_range Message-ID: <20241115163552.mk7msyu57oqqetaw@thinkpad> References: <20241029-pci_fixup_addr-v7-0-8310dc24fb7c@nxp.com> <20241029-pci_fixup_addr-v7-1-8310dc24fb7c@nxp.com> Precedence: bulk X-Mailing-List: imx@lists.linux.dev 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: <20241029-pci_fixup_addr-v7-1-8310dc24fb7c@nxp.com> On Tue, Oct 29, 2024 at 12:36:34PM -0400, Frank Li wrote: > Introduce field 'parent_bus_addr' in struct of_pci_range to retrieve parent > bus address information. > > Refer to the diagram below to understand that the bus fabric in some > systems (like i.MX8QXP) does not use a 1:1 address map between input and > output. > > Currently, many controller drivers use .cpu_addr_fixup() callback hardcodes > that translation in the code, e.g., "cpu_addr & CDNS_PLAT_CPU_TO_BUS_ADDR" > (drivers/pci/controller/cadence/pcie-cadence-plat.c), > "cpu_addr + BUS_IATU_OFFSET"(drivers/pci/controller/dwc/pcie-intel-gw.c), > etc, even though those translations *should* be described via DT. > > The .cpu_addr_fixup() can be eliminated if DT correct reflect hardware > behavior and driver use 'parent_bus_addr' in struct of_pci_range. > > ┌─────────┐ ┌────────────┐ > ┌─────┐ │ │ IA: 0x8ff8_0000 │ │ > │ CPU ├───►│ ┌────►├─────────────────┐ │ PCI │ > └─────┘ │ │ │ IA: 0x8ff0_0000 │ │ │ > CPU Addr │ │ ┌─►├─────────────┐ │ │ Controller │ > 0x7ff8_0000─┼───┘ │ │ │ │ │ │ > │ │ │ │ │ │ │ PCI Addr > 0x7ff0_0000─┼──────┘ │ │ └──► IOSpace ─┼────────────► > │ │ │ │ │ 0 > 0x7000_0000─┼────────►├─────────┐ │ │ │ > └─────────┘ │ └──────► CfgSpace ─┼────────────► > BUS Fabric │ │ │ 0 > │ │ │ > └──────────► MemSpace ─┼────────────► > IA: 0x8000_0000 │ │ 0x8000_0000 > └────────────┘ > > bus@5f000000 { > compatible = "simple-bus"; > #address-cells = <1>; > #size-cells = <1>; > ranges = <0x80000000 0x0 0x70000000 0x10000000>; > > pcie@5f010000 { > compatible = "fsl,imx8q-pcie"; > reg = <0x5f010000 0x10000>, <0x8ff00000 0x80000>; > reg-names = "dbi", "config"; > #address-cells = <3>; > #size-cells = <2>; > device_type = "pci"; > bus-range = <0x00 0xff>; > ranges = <0x81000000 0 0x00000000 0x8ff80000 0 0x00010000>, > <0x82000000 0 0x80000000 0x80000000 0 0x0ff00000>; > ... > }; > }; > > 'parent_bus_addr' in struct of_pci_range can indicate above diagram internal > address (IA) address information. > > Reviewed-by: Rob Herring (Arm) > Signed-off-by: Frank Li Acked-by: Manivannan Sadhasivam - Mani > --- > Change from v5 to v7 > -none > > Change from v4 to v5 > - remove confused <0x5f000000 0x0 0x5f000000 0x21000000> > - change address order to 7ff8_0000, 7ff0_0000, 7000_0000 > - In commit message use parent bus addres > > Change from v3 to v4 > - improve commit message by driver source code path. > > Change from v2 to v3 > - cpu_untranslate_addr -> parent_bus_addr > - Add Rob's review tag > I changed commit message base on Bjorn, if you have concern about review > added tag, let me know. > > Change from v1 to v2 > - add parent_bus_addr in struct of_pci_range, instead adding new API. > --- > drivers/of/address.c | 2 ++ > include/linux/of_address.h | 1 + > 2 files changed, 3 insertions(+) > > diff --git a/drivers/of/address.c b/drivers/of/address.c > index 286f0c161e332..1a0229ee4e0b2 100644 > --- a/drivers/of/address.c > +++ b/drivers/of/address.c > @@ -811,6 +811,8 @@ struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser, > else > range->cpu_addr = of_translate_address(parser->node, > parser->range + na); > + > + range->parent_bus_addr = of_read_number(parser->range + na, parser->pna); > range->size = of_read_number(parser->range + parser->pna + na, ns); > > parser->range += np; > diff --git a/include/linux/of_address.h b/include/linux/of_address.h > index 26a19daf0d092..13dd79186d02c 100644 > --- a/include/linux/of_address.h > +++ b/include/linux/of_address.h > @@ -26,6 +26,7 @@ struct of_pci_range { > u64 bus_addr; > }; > u64 cpu_addr; > + u64 parent_bus_addr; > u64 size; > u32 flags; > }; > > -- > 2.34.1 > -- மணிவண்ணன் சதாசிவம்