From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755629AbdDJRK5 (ORCPT ); Mon, 10 Apr 2017 13:10:57 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:36186 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932177AbdDJQvf (ORCPT ); Mon, 10 Apr 2017 12:51:35 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Robert Richter , Tomasz Nowicki , Vadim Lomovtsev , Bjorn Helgaas Subject: [PATCH 4.10 007/110] PCI: thunder-pem: Add legacy firmware support for Cavium ThunderX host controller Date: Mon, 10 Apr 2017 18:41:58 +0200 Message-Id: <20170410164201.657177169@linuxfoundation.org> X-Mailer: git-send-email 2.12.2 In-Reply-To: <20170410164201.247583164@linuxfoundation.org> References: <20170410164201.247583164@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tomasz Nowicki commit 9abb27c7594a62bbf6385e20b7f5a90b4eceae2f upstream. During early days of PCI quirks support, ThunderX firmware did not provide PNP0c02 node with PCI configuration space and PEM-specific register ranges. This means that for legacy FW we are not reserving these resources and cannot gather PEM-specific resources for further PEM initialization. To support already deployed legacy FW, calculate PEM-specific ranges and provide resources reservation as fallback scenario into PEM driver when we could not gather PEM reg base from ACPI tables. Tested-by: Robert Richter Signed-off-by: Tomasz Nowicki Signed-off-by: Vadim Lomovtsev Signed-off-by: Bjorn Helgaas Acked-by: Robert Richter Signed-off-by: Greg Kroah-Hartman --- drivers/pci/host/pci-thunder-pem.c | 56 +++++++++++++++++++++++++++++++++++-- 1 file changed, 54 insertions(+), 2 deletions(-) --- a/drivers/pci/host/pci-thunder-pem.c +++ b/drivers/pci/host/pci-thunder-pem.c @@ -14,6 +14,7 @@ * Copyright (C) 2015 - 2016 Cavium, Inc. */ +#include #include #include #include @@ -319,6 +320,50 @@ static int thunder_pem_init(struct devic #if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS) +#define PEM_RES_BASE 0x87e0c0000000UL +#define PEM_NODE_MASK GENMASK(45, 44) +#define PEM_INDX_MASK GENMASK(26, 24) +#define PEM_MIN_DOM_IN_NODE 4 +#define PEM_MAX_DOM_IN_NODE 10 + +static void thunder_pem_reserve_range(struct device *dev, int seg, + struct resource *r) +{ + resource_size_t start = r->start, end = r->end; + struct resource *res; + const char *regionid; + + regionid = kasprintf(GFP_KERNEL, "PEM RC:%d", seg); + if (!regionid) + return; + + res = request_mem_region(start, end - start + 1, regionid); + if (res) + res->flags &= ~IORESOURCE_BUSY; + else + kfree(regionid); + + dev_info(dev, "%pR %s reserved\n", r, + res ? "has been" : "could not be"); +} + +static void thunder_pem_legacy_fw(struct acpi_pci_root *root, + struct resource *res_pem) +{ + int node = acpi_get_node(root->device->handle); + int index; + + if (node == NUMA_NO_NODE) + node = 0; + + index = root->segment - PEM_MIN_DOM_IN_NODE; + index -= node * PEM_MAX_DOM_IN_NODE; + res_pem->start = PEM_RES_BASE | FIELD_PREP(PEM_NODE_MASK, node) | + FIELD_PREP(PEM_INDX_MASK, index); + res_pem->end = res_pem->start + SZ_16M - 1; + res_pem->flags = IORESOURCE_MEM; +} + static int thunder_pem_acpi_init(struct pci_config_window *cfg) { struct device *dev = cfg->parent; @@ -332,9 +377,16 @@ static int thunder_pem_acpi_init(struct return -ENOMEM; ret = acpi_get_rc_resources(dev, "CAVA02B", root->segment, res_pem); + + /* + * If we fail to gather resources it means that we run with old + * FW where we need to calculate PEM-specific resources manually. + */ if (ret) { - dev_err(dev, "can't get rc base address\n"); - return ret; + thunder_pem_legacy_fw(root, res_pem); + /* Reserve PEM-specific resources and PCI configuration space */ + thunder_pem_reserve_range(dev, root->segment, res_pem); + thunder_pem_reserve_range(dev, root->segment, &cfg->res); } return thunder_pem_init(dev, cfg, res_pem);