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[23.128.96.18]) by mx.google.com with ESMTP id a14si4173167edx.54.2021.02.18.11.56.05; Thu, 18 Feb 2021 11:56:28 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=sVKez0e4; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231444AbhBRTzA (ORCPT + 99 others); Thu, 18 Feb 2021 14:55:00 -0500 Received: from mail.kernel.org ([198.145.29.99]:57494 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232630AbhBRT2N (ORCPT ); Thu, 18 Feb 2021 14:28:13 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id CB90164DF0; Thu, 18 Feb 2021 19:27:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1613676452; bh=XfVjVZpWYLTAsNl6mOoxLz46fumb9V2SXnTYEAUS40Q=; h=Date:From:To:Cc:Subject:In-Reply-To:From; b=sVKez0e4ne1EbQ5M8GLkhuHBoD6+l+5DRo9A8zB/gcW1IlrLH5iyEgvIHhIIl9huB ExOx92OO8HSsasfnwOEEEDzNMjjOolPnP1657MjkPyP5HSN+qEhbz8mFyjX/rM+A1k UH8Ja/Srp15x3YE08Z2eIOtJgyd67POMHDxTzpypyq6RVVXANFbVJ5ZCX8JtbF65jD 5m0UKc7XaXHVYHJ6QFWAgwP5vPh0CwASyx95Ly5QzLfl4uYCrTStN6qC/2uJHGruhQ sQ+bPFsZA96pZP8I+Hzlyv2CO7yZ9lJsDgeg2jeIgdsgF15tlv23yUmIFa2cvYEG3/ WzfnwSuXQj9rw== Date: Thu, 18 Feb 2021 13:27:30 -0600 From: Bjorn Helgaas To: Gustavo Pimentel Cc: dmaengine@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Vinod Koul , Dan Williams , Bjorn Helgaas , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Lukas Wunner Subject: Re: [PATCH v7 04/15] PCI: Add pci_find_vsec_capability() to find a specific VSEC Message-ID: <20210218192730.GA996712@bjorn-Precision-5520> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Feb 18, 2021 at 08:03:58PM +0100, Gustavo Pimentel wrote: > Add pci_find_vsec_capability() to locate a Vendor-Specific Extended > Capability with the specified VSEC ID. > > The Vendor-Specific Extended Capability (VSEC) allows one or more > proprietary capabilities defined by the vendor which aren't standard > or shared between vendors. > > Signed-off-by: Gustavo Pimentel Beautiful, thanks! Acked-by: Bjorn Helgaas > --- > drivers/pci/pci.c | 30 ++++++++++++++++++++++++++++++ > include/linux/pci.h | 1 + > 2 files changed, 31 insertions(+) > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index b9fecc2..aef217c 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c > @@ -693,6 +693,36 @@ u8 pci_find_ht_capability(struct pci_dev *dev, int ht_cap) > EXPORT_SYMBOL_GPL(pci_find_ht_capability); > > /** > + * pci_find_vsec_capability - Find a vendor-specific extended capability > + * @dev: PCI device to query > + * @vendor: Vendor ID for which capability is defined > + * @cap: Vendor-specific capability ID > + * > + * If @dev has Vendor ID @vendor, search for a VSEC capability with > + * VSEC ID @cap. If found, return the capability offset in > + * config space; otherwise return 0. > + */ > +u16 pci_find_vsec_capability(struct pci_dev *dev, u16 vendor, int cap) > +{ > + u16 vsec = 0; > + u32 header; > + > + if (vendor != dev->vendor) > + return 0; > + > + while ((vsec = pci_find_next_ext_capability(dev, vsec, > + PCI_EXT_CAP_ID_VNDR))) { > + if (pci_read_config_dword(dev, vsec + PCI_VNDR_HEADER, > + &header) == PCIBIOS_SUCCESSFUL && > + PCI_VNDR_HEADER_ID(header) == cap) > + return vsec; > + } > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(pci_find_vsec_capability); > + > +/** > * pci_find_parent_resource - return resource region of parent bus of given > * region > * @dev: PCI device structure contains resources to be searched > diff --git a/include/linux/pci.h b/include/linux/pci.h > index b32126d..814f814 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -1077,6 +1077,7 @@ u8 pci_find_next_ht_capability(struct pci_dev *dev, u8 pos, int ht_cap); > u16 pci_find_ext_capability(struct pci_dev *dev, int cap); > u16 pci_find_next_ext_capability(struct pci_dev *dev, u16 pos, int cap); > struct pci_bus *pci_find_next_bus(const struct pci_bus *from); > +u16 pci_find_vsec_capability(struct pci_dev *dev, u16 vendor, int cap); If you do any updates for other reasons, slide this up one more line so we have: u16 pci_find_ext_capability(struct pci_dev *dev, int cap); u16 pci_find_next_ext_capability(struct pci_dev *dev, u16 pos, int cap); u16 pci_find_vsec_capability(struct pci_dev *dev, u16 vendor, int cap); struct pci_bus *pci_find_next_bus(const struct pci_bus *from); I don't know why pci_find_next_bus() got stuck with the capability things. It doesn't have anything to do with finding capabilities. It goes more with pci_get_device(), etc. But don't roll the series just for that. > u64 pci_get_dsn(struct pci_dev *dev); > > -- > 2.7.4 >