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[209.132.180.67]) by mx.google.com with ESMTP id u10-v6si19141555plq.1.2018.10.17.18.26.01; Wed, 17 Oct 2018 18:26:17 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727449AbeJRJYD (ORCPT + 99 others); Thu, 18 Oct 2018 05:24:03 -0400 Received: from mailgw02.mediatek.com ([1.203.163.81]:42897 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726673AbeJRJYC (ORCPT ); Thu, 18 Oct 2018 05:24:02 -0400 X-UUID: e53af6b4d2774edd9642ab5af7340b6c-20181018 X-UUID: e53af6b4d2774edd9642ab5af7340b6c-20181018 Received: from mtkcas35.mediatek.inc [(172.27.4.250)] by mailgw02.mediatek.com (envelope-from ) (mailgw01.mediatek.com ESMTP with TLS) with ESMTP id 883320070; Thu, 18 Oct 2018 09:25:14 +0800 Received: from MTKCAS36.mediatek.inc (172.27.4.186) by MTKMBS31DR.mediatek.inc (172.27.6.102) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Thu, 18 Oct 2018 09:25:13 +0800 Received: from [10.17.3.153] (10.17.3.153) by MTKCAS36.mediatek.inc (172.27.4.170) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Thu, 18 Oct 2018 09:25:12 +0800 Message-ID: <1539825912.11281.8.camel@mhfsdcap03> Subject: Re: [PATCH v9 2/9] PCI: Using PCI configuration space header type instead of class type to assign resource From: Honghui Zhang To: Bjorn Helgaas CC: Lorenzo Pieralisi , , , , , , , , , , , , , , , Date: Thu, 18 Oct 2018 09:25:12 +0800 In-Reply-To: <20181017132251.GG5906@bhelgaas-glaptop.roam.corp.google.com> References: <1539686690-24068-1-git-send-email-honghui.zhang@mediatek.com> <1539686690-24068-3-git-send-email-honghui.zhang@mediatek.com> <20181016145355.GB16390@e107981-ln.cambridge.arm.com> <20181017132251.GG5906@bhelgaas-glaptop.roam.corp.google.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3-0ubuntu6 Content-Transfer-Encoding: 7bit MIME-Version: 1.0 X-MTK: N Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2018-10-17 at 08:22 -0500, Bjorn Helgaas wrote: > On Tue, Oct 16, 2018 at 03:53:55PM +0100, Lorenzo Pieralisi wrote: > > On Tue, Oct 16, 2018 at 06:44:43PM +0800, honghui.zhang@mediatek.com wrote: > > > From: Honghui Zhang > > > > > > The PCI configuration space header type defines the layout of the rest > > > of the header (PCI r3.0 sec 6.1, PCIe r4.0 sec 7.5.1.1.9) while the > > > resource assignment is based on the configuration space layout instead > > > of its class type. Using configuration space header type instead of > > > class type for the resource assignment. > > > > > > Suggested-by: Bjorn Helgaas > > > Signed-off-by: Honghui Zhang > > > --- > > > drivers/pci/pci.c | 3 +-- > > > drivers/pci/probe.c | 3 --- > > > drivers/pci/setup-bus.c | 20 ++++++++++---------- > > > 3 files changed, 11 insertions(+), 15 deletions(-) > > > > > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > > > index 29ff961..7d379ca 100644 > > > --- a/drivers/pci/pci.c > > > +++ b/drivers/pci/pci.c > > > @@ -5908,8 +5908,7 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev) > > > * to enable the kernel to reassign new resource > > > * window later on. > > > */ > > > - if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && > > > - (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { > > > + if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { > > > for (i = PCI_BRIDGE_RESOURCES; i < PCI_NUM_RESOURCES; i++) { > > > r = &dev->resource[i]; > > > if (!(r->flags & IORESOURCE_MEM)) > > > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c > > > index ec78400..29a35c1 100644 > > > --- a/drivers/pci/probe.c > > > +++ b/drivers/pci/probe.c > > > @@ -1695,9 +1695,6 @@ int pci_setup_device(struct pci_dev *dev) > > > break; > > > > > > case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ > > > - if (class != PCI_CLASS_BRIDGE_PCI) > > > - goto bad; > > > - > > > /* > > > * The PCI-to-PCI bridge spec requires that subtractive > > > * decoding (i.e. transparent) bridge must have programming > > > diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c > > > index 79b1824..69f90f4 100644 > > > --- a/drivers/pci/setup-bus.c > > > +++ b/drivers/pci/setup-bus.c > > > @@ -182,7 +182,7 @@ static void __dev_sort_resources(struct pci_dev *dev, > > > u16 class = dev->class >> 8; > > > > > > /* Don't touch classless devices or host bridges or ioapics. */ > > > - if (class == PCI_CLASS_NOT_DEFINED || class == PCI_CLASS_BRIDGE_HOST) > > > + if (class == PCI_CLASS_NOT_DEFINED) > > > > I think this check has been there since the first initial git commit, > > whether that's _really_ needed or not in the current kernel it is very > > hard to say. > > > > I am not that sure it is safe to remove it, especially given that we are at > > -rc8 and close to a release, it would be good if this patch could sit in > > next to give it some exposure to testing before merging it upstream. > I'm not sure why the first version has take care of PCI_CLASS_BRIDGE_HOST separately, I have no idea whether there's some host bridge device that has their resource fixed. I agree that this patch should be hold for the moment since I have it tested only in Mediatek's platform. Thanks > Yes, you're right; I think I think this is a little too risky at this > point. I'll pull this patch out and queue it up for the next cycle > (v4.21). Thanks, I will follow up this patch. > > For v4.20, I think you should resurrect the class code patch [1]. That > should be enough to make things work in v4.20, even without this hdr_type > patch. It will also improve the lspci output, because I think it uses the > class code to look up the generic description, e.g., in this output: > > 00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port (rev f1) > > I think the "PCI bridge" part is based on the class code. > > Bjorn > > [1] https://lore.kernel.org/linux-pci/1539590940-13355-3-git-send-email-honghui.zhang@mediatek.com > > > > return; > > > > > > /* Don't touch ioapic devices already enabled by firmware */ > > > @@ -1221,12 +1221,12 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) > > > if (!b) > > > continue; > > > > > > - switch (dev->class >> 8) { > > > - case PCI_CLASS_BRIDGE_CARDBUS: > > > + switch (dev->hdr_type) { > > > + case PCI_HEADER_TYPE_CARDBUS: > > > pci_bus_size_cardbus(b, realloc_head); > > > break; > > > > > > - case PCI_CLASS_BRIDGE_PCI: > > > + case PCI_HEADER_TYPE_BRIDGE: > > > default: > > > __pci_bus_size_bridges(b, realloc_head); > > > break; > > > @@ -1237,12 +1237,12 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) > > > if (pci_is_root_bus(bus)) > > > return; > > > > > > - switch (bus->self->class >> 8) { > > > - case PCI_CLASS_BRIDGE_CARDBUS: > > > + switch (bus->self->hdr_type) { > > > + case PCI_HEADER_TYPE_CARDBUS: > > > /* don't size cardbuses yet. */ > > > break; > > > > > > - case PCI_CLASS_BRIDGE_PCI: > > > + case PCI_HEADER_TYPE_BRIDGE: > > > pci_bridge_check_ranges(bus); > > > if (bus->self->is_hotplug_bridge) { > > > additional_io_size = pci_hotplug_io_size; > > > @@ -1391,13 +1391,13 @@ void __pci_bus_assign_resources(const struct pci_bus *bus, > > > > > > __pci_bus_assign_resources(b, realloc_head, fail_head); > > > > > > - switch (dev->class >> 8) { > > > - case PCI_CLASS_BRIDGE_PCI: > > > + switch (dev->hdr_type) { > > > + case PCI_HEADER_TYPE_BRIDGE: > > > if (!pci_is_enabled(dev)) > > > pci_setup_bridge(b); > > > break; > > > > > > - case PCI_CLASS_BRIDGE_CARDBUS: > > > + case PCI_HEADER_TYPE_CARDBUS: > > > pci_setup_cardbus(b); > > > break; > > > > > > -- > > > 2.6.4 > > > > > > > _______________________________________________ > > linux-arm-kernel mailing list > > linux-arm-kernel@lists.infradead.org > > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel