From patchwork Tue Aug 26 14:57:40 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thierry Reding X-Patchwork-Id: 383096 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 946FC140107 for ; Wed, 27 Aug 2014 00:59:30 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934403AbaHZO5z (ORCPT ); Tue, 26 Aug 2014 10:57:55 -0400 Received: from mail-wi0-f179.google.com ([209.85.212.179]:45052 "EHLO mail-wi0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755253AbaHZO5y (ORCPT ); Tue, 26 Aug 2014 10:57:54 -0400 Received: by mail-wi0-f179.google.com with SMTP id f8so4309101wiw.6 for ; Tue, 26 Aug 2014 07:57:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=grNEJsEp7mD5uZbDr4pwFGbqLN6icI1U/cgMBhCWrRY=; b=g2uQIokIkyrZj0OGpkhshCQA0VeNBcVwpR+NP7Ou1gl4Se7BJuxisNxMGWCIRYxOdT 9xn+21ROkAIgH0oFjCoVLSd37hFbgHNwQEIOdQt06+8tSskKIoTict46Wunew+xmOT2j 6IBFYVnMKDzioQv1eqkVYf+ntEZepv7RhNgrvry1xOEgU48w3/NarmpHQh2ArT2gKqOC Pft3JLb5NIW6sYKezrK1PSOIHpVqQZgImxTGy/owT41IMXuvNnR5fHayExiQNsiijl98 BEcNB3BR6qXxSTspL/9nrP0GF8i2EieLYYLUM7ifzn7RDUS/5JCx+997xV2WfyBkIHRw onEQ== X-Received: by 10.180.183.36 with SMTP id ej4mr22394121wic.77.1409065072488; Tue, 26 Aug 2014 07:57:52 -0700 (PDT) Received: from localhost (port-7111.pppoe.wtnet.de. [84.46.27.226]) by mx.google.com with ESMTPSA id ep3sm13032833wib.8.2014.08.26.07.57.51 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 26 Aug 2014 07:57:51 -0700 (PDT) From: Thierry Reding To: Bjorn Helgaas Cc: Stephen Warren , linux-pci@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/6] PCI: tegra: Implement a proper resource hierarchy Date: Tue, 26 Aug 2014 16:57:40 +0200 Message-Id: <1409065064-17617-3-git-send-email-thierry.reding@gmail.com> X-Mailer: git-send-email 2.0.4 In-Reply-To: <1409065064-17617-1-git-send-email-thierry.reding@gmail.com> References: <1409065064-17617-1-git-send-email-thierry.reding@gmail.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Thierry Reding Currently the resource hierarchy generated from the PCIe host bridge is completely flat: $ cat /proc/iomem 00000000-00000fff : /pcie-controller@00003000/pci@1,0 00003000-000037ff : pads 00003800-000039ff : afi 10000000-1fffffff : cs 28000000-28003fff : r8169 28004000-28004fff : r8169 ... The host bridge driver doesn't request all the resources that are used. Windows allocated to each of the root ports aren't tracked, so there is no way for resources allocated to individual devices to be matched up with the correct parent resource by the PCI core. This patch addresses this in two steps. It first takes the union of all regions associated with the PCIe host bridge (control registers, root port registers, configuration space, I/O and prefetchable as well as non-prefetchable memory regions) and uses it as the new root of the resource hierarchy. Subsequently, regions are allocated from within this new root resource so that the resource tree looks much more like what's expected: # cat /proc/iomem 00000000-3fffffff : /pcie-controller@00003000 00000000-00000fff : /pcie-controller@00003000/pci@1,0 00003000-000037ff : pads 00003800-000039ff : afi 10000000-1fffffff : cs 20000000-27ffffff : non-prefetchable 28000000-3fffffff : prefetchable 28000000-280fffff : PCI Bus 0000:01 28000000-28003fff : 0000:01:00.0 28000000-28003fff : r8169 28004000-28004fff : 0000:01:00.0 28004000-28004fff : r8169 ... Signed-off-by: Thierry Reding --- drivers/pci/host/pci-tegra.c | 32 +++++++++++++++++++++++++++++--- 1 file changed, 29 insertions(+), 3 deletions(-) diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c index 0fb0fdb223d5..83fa33e16650 100644 --- a/drivers/pci/host/pci-tegra.c +++ b/drivers/pci/host/pci-tegra.c @@ -253,6 +253,7 @@ struct tegra_pcie { struct list_head buses; struct resource *cs; + struct resource all; struct resource io; struct resource mem; struct resource prefetch; @@ -626,6 +627,15 @@ DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_relax_enable); static int tegra_pcie_setup(int nr, struct pci_sys_data *sys) { struct tegra_pcie *pcie = sys_to_pcie(sys); + int err; + + err = devm_request_resource(pcie->dev, &pcie->all, &pcie->mem); + if (err < 0) + return err; + + err = devm_request_resource(pcie->dev, &pcie->all, &pcie->prefetch); + if (err) + return err; pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset); pci_add_resource_offset(&sys->resources, &pcie->prefetch, @@ -1514,6 +1524,12 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie) struct resource res; int err; + memset(&pcie->all, 0, sizeof(pcie->all)); + pcie->all.flags = IORESOURCE_MEM; + pcie->all.name = np->full_name; + pcie->all.start = ~0; + pcie->all.end = 0; + if (of_pci_range_parser_init(&parser, np)) { dev_err(pcie->dev, "missing \"ranges\" property\n"); return -EINVAL; @@ -1525,21 +1541,31 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie) switch (res.flags & IORESOURCE_TYPE_BITS) { case IORESOURCE_IO: memcpy(&pcie->io, &res, sizeof(res)); - pcie->io.name = "I/O"; + pcie->io.name = np->full_name; break; case IORESOURCE_MEM: if (res.flags & IORESOURCE_PREFETCH) { memcpy(&pcie->prefetch, &res, sizeof(res)); - pcie->prefetch.name = "PREFETCH"; + pcie->prefetch.name = "prefetchable"; } else { memcpy(&pcie->mem, &res, sizeof(res)); - pcie->mem.name = "MEM"; + pcie->mem.name = "non-prefetchable"; } break; } + + if (res.start <= pcie->all.start) + pcie->all.start = res.start; + + if (res.end >= pcie->all.end) + pcie->all.end = res.end; } + err = devm_request_resource(pcie->dev, &iomem_resource, &pcie->all); + if (err < 0) + return err; + err = of_pci_parse_bus_range(np, &pcie->busn); if (err < 0) { dev_err(pcie->dev, "failed to parse ranges property: %d\n",