From patchwork Thu Oct 24 17:12:14 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergei Miroshnichenko X-Patchwork-Id: 11210449 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 965B61575 for ; Thu, 24 Oct 2019 17:12:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7438921D7F for ; Thu, 24 Oct 2019 17:12:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=yadro.com header.i=@yadro.com header.b="JdjngX3l" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2436815AbfJXRMw (ORCPT ); Thu, 24 Oct 2019 13:12:52 -0400 Received: from mta-02.yadro.com ([89.207.88.252]:48798 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2436722AbfJXRMw (ORCPT ); Thu, 24 Oct 2019 13:12:52 -0400 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id C8F7E43B0D; Thu, 24 Oct 2019 17:12:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=yadro.com; h= content-type:content-type:content-transfer-encoding:mime-version :references:in-reply-to:x-mailer:message-id:date:date:subject :subject:from:from:received:received:received; s=mta-01; t= 1571937169; x=1573751570; bh=lTVQlF3kduJM6KsoDp7P/x9aP7WF3SRvN3M l+fzwz18=; b=JdjngX3l9+/wTkWjP6QCnvCRSDyNM79OXyCLy0n7MKH89dvGnuD DGdmaK1Qo7okFH3JnlLIjxkNu/teOiTPfyWQcqrnaFq5naZmBKN8sdTMlPpMDO+E sUe/xJWAVAgfM0dz5TUAl7g79KFPsm6YNY9UwKuA3WNFV+KZc06kbQSg= X-Virus-Scanned: amavisd-new at yadro.com Received: from mta-01.yadro.com ([127.0.0.1]) by localhost (mta-01.yadro.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 08x2dEaeuj55; Thu, 24 Oct 2019 20:12:49 +0300 (MSK) Received: from T-EXCH-02.corp.yadro.com (t-exch-02.corp.yadro.com [172.17.10.102]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mta-01.yadro.com (Postfix) with ESMTPS id 5485243C28; Thu, 24 Oct 2019 20:12:42 +0300 (MSK) Received: from NB-148.yadro.com (172.17.15.136) by T-EXCH-02.corp.yadro.com (172.17.10.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Thu, 24 Oct 2019 20:12:41 +0300 From: Sergey Miroshnichenko To: , CC: Bjorn Helgaas , , Sergey Miroshnichenko Subject: [PATCH v6 16/30] PCI: hotplug: movable BARs: Assign fixed and immovable BARs before others Date: Thu, 24 Oct 2019 20:12:14 +0300 Message-ID: <20191024171228.877974-17-s.miroshnichenko@yadro.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191024171228.877974-1-s.miroshnichenko@yadro.com> References: <20191024171228.877974-1-s.miroshnichenko@yadro.com> MIME-Version: 1.0 X-Originating-IP: [172.17.15.136] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-02.corp.yadro.com (172.17.10.102) Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Reassign resources during rescan in two steps: first the fixed/immovable BARs and bridge windows that have fixed areas, so the movable ones will not steal these reserved areas; then the rest - so the movable BARs will divide the rest of the space. With this change, pci_assign_resource() is now able to assign all types of BARs, so the pdev_assign_fixed_resources() became unused and thus removed. Signed-off-by: Sergey Miroshnichenko --- drivers/pci/pci.h | 2 ++ drivers/pci/setup-bus.c | 78 ++++++++++++++++++++++++----------------- drivers/pci/setup-res.c | 7 ++-- 3 files changed, 53 insertions(+), 34 deletions(-) diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 7cd108885598..9b5164d10499 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -289,6 +289,8 @@ void pci_bus_put(struct pci_bus *bus); bool pci_dev_bar_movable(struct pci_dev *dev, struct resource *res); +int assign_fixed_resource_on_bus(struct pci_bus *b, struct resource *r); + /* PCIe link information */ #define PCIE_SPEED2STR(speed) \ ((speed) == PCIE_SPEED_16_0GT ? "16 GT/s" : \ diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index c7365998fbd6..675a612236d7 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -38,6 +38,15 @@ struct pci_dev_resource { unsigned long flags; }; +enum assign_step { + assign_fixed_resources, + assign_float_resources, +}; + +static void _assign_requested_resources_sorted(struct list_head *head, + struct list_head *fail_head, + enum assign_step step); + static void free_list(struct list_head *head) { struct pci_dev_resource *dev_res, *tmp; @@ -278,19 +287,47 @@ static void reassign_resources_sorted(struct list_head *realloc_head, */ static void assign_requested_resources_sorted(struct list_head *head, struct list_head *fail_head) +{ + _assign_requested_resources_sorted(head, fail_head, assign_fixed_resources); + _assign_requested_resources_sorted(head, fail_head, assign_float_resources); +} + +static void _assign_requested_resources_sorted(struct list_head *head, + struct list_head *fail_head, + enum assign_step step) { struct resource *res; struct pci_dev_resource *dev_res; int idx; list_for_each_entry(dev_res, head, list) { + bool is_fixed = false; + if (!pci_dev_bars_enabled(dev_res->dev)) continue; res = dev_res->res; + if (!resource_size(res)) + continue; + idx = res - &dev_res->dev->resource[0]; - if (resource_size(res) && - pci_assign_resource(dev_res->dev, idx)) { + + if (idx < PCI_BRIDGE_RESOURCES) { + is_fixed = !pci_dev_bar_movable(dev_res->dev, res); + } else { + int b_res_idx = pci_get_bridge_resource_idx(res); + struct resource *fixed_res = + &dev_res->dev->subordinate->immovable_range[b_res_idx]; + + is_fixed = (fixed_res->start < fixed_res->end); + } + + if (assign_fixed_resources == step && !is_fixed) + continue; + else if (assign_float_resources == step && is_fixed) + continue; + + if (pci_assign_resource(dev_res->dev, idx)) { if (fail_head) { /* * If the failed resource is a ROM BAR and @@ -1335,7 +1372,7 @@ void pci_bus_size_bridges(struct pci_bus *bus) } EXPORT_SYMBOL(pci_bus_size_bridges); -static void assign_fixed_resource_on_bus(struct pci_bus *b, struct resource *r) +int assign_fixed_resource_on_bus(struct pci_bus *b, struct resource *r) { int i; struct resource *parent_r; @@ -1352,35 +1389,14 @@ static void assign_fixed_resource_on_bus(struct pci_bus *b, struct resource *r) !(r->flags & IORESOURCE_PREFETCH)) continue; - if (resource_contains(parent_r, r)) - request_resource(parent_r, r); - } -} - -/* - * Try to assign any resources marked as IORESOURCE_PCI_FIXED, as they are - * skipped by pbus_assign_resources_sorted(). - */ -static void pdev_assign_fixed_resources(struct pci_dev *dev) -{ - int i; - - for (i = 0; i < PCI_NUM_RESOURCES; i++) { - struct pci_bus *b; - struct resource *r = &dev->resource[i]; - - if (r->parent || !(r->flags & IORESOURCE_PCI_FIXED) || - !(r->flags & (IORESOURCE_IO | IORESOURCE_MEM))) - continue; - - b = dev->bus; - while (b && !r->parent) { - assign_fixed_resource_on_bus(b, r); - b = b->parent; - if (!r->parent && pci_can_move_bars) - break; + if (resource_contains(parent_r, r)) { + if (!request_resource(parent_r, r)) + return 0; } } + + dev_err(&b->dev, "failed to assign immovable %pR\n", r); + return -EBUSY; } void __pci_bus_assign_resources(const struct pci_bus *bus, @@ -1396,8 +1412,6 @@ void __pci_bus_assign_resources(const struct pci_bus *bus, if (!pci_dev_bars_enabled(dev)) continue; - pdev_assign_fixed_resources(dev); - b = dev->subordinate; if (!b) continue; diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index 1570bbd620cd..924ea8241061 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -351,8 +351,11 @@ int pci_assign_resource(struct pci_dev *dev, int resno) resource_size_t align, size; int ret; - if (res->flags & IORESOURCE_PCI_FIXED) - return 0; + if (resno < PCI_BRIDGE_RESOURCES && + !pci_dev_bar_movable(dev, res) && + res->start) { + return assign_fixed_resource_on_bus(dev->bus, res); + } res->flags |= IORESOURCE_UNSET; align = pci_resource_alignment(dev, res);