From patchwork Fri Jul 11 06:19:38 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiang Liu X-Patchwork-Id: 4530611 Return-Path: X-Original-To: patchwork-dmaengine@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id C6B819F4F5 for ; Fri, 11 Jul 2014 06:21:34 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8DED62015A for ; Fri, 11 Jul 2014 06:21:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3FB6F2016C for ; Fri, 11 Jul 2014 06:21:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752253AbaGKGU6 (ORCPT ); Fri, 11 Jul 2014 02:20:58 -0400 Received: from mga01.intel.com ([192.55.52.88]:63068 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752480AbaGKGRy (ORCPT ); Fri, 11 Jul 2014 02:17:54 -0400 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga101.fm.intel.com with ESMTP; 10 Jul 2014 23:17:48 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,642,1400050800"; d="scan'208";a="560333337" Received: from gerry-dev.bj.intel.com ([10.238.158.74]) by fmsmga001.fm.intel.com with ESMTP; 10 Jul 2014 23:17:44 -0700 From: Jiang Liu To: Joerg Roedel , David Woodhouse , Yinghai Lu , Bjorn Helgaas , Dan Williams , Vinod Koul , "Rafael J . Wysocki" Cc: Jiang Liu , Ashok Raj , Yijing Wang , Tony Luck , iommu@lists.linux-foundation.org, linux-pci@vger.kernel.org, linux-hotplug@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org Subject: [Patch Part3 V4 14/21] iommu/vt-d: Introduce helper function dmar_walk_resources() Date: Fri, 11 Jul 2014 14:19:38 +0800 Message-Id: <1405059585-10620-15-git-send-email-jiang.liu@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1405059585-10620-1-git-send-email-jiang.liu@linux.intel.com> References: <1405059585-10620-1-git-send-email-jiang.liu@linux.intel.com> Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Introduce helper function dmar_walk_resources to walk resource entries in DMAR table and ACPI buffer object returned by ACPI _DSM method for IOMMU hot-plug. Signed-off-by: Jiang Liu --- drivers/iommu/dmar.c | 208 +++++++++++++++++++++++-------------------- drivers/iommu/intel-iommu.c | 4 +- include/linux/dmar.h | 19 ++-- 3 files changed, 122 insertions(+), 109 deletions(-) diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index 4306885f48b1..4fdf238a2a28 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -44,6 +44,14 @@ #include "irq_remapping.h" +typedef int (*dmar_res_handler_t)(struct acpi_dmar_header *, void *); +struct dmar_res_callback { + dmar_res_handler_t cb[ACPI_DMAR_TYPE_RESERVED]; + void *arg[ACPI_DMAR_TYPE_RESERVED]; + bool ignore_unhandled; + bool print_entry; +}; + /* * Assumptions: * 1) The hotplug framework guarentees that DMAR unit will be hot-added @@ -333,7 +341,7 @@ static struct notifier_block dmar_pci_bus_nb = { * present in the platform */ static int __init -dmar_parse_one_drhd(struct acpi_dmar_header *header) +dmar_parse_one_drhd(struct acpi_dmar_header *header, void *arg) { struct acpi_dmar_hardware_unit *drhd; struct dmar_drhd_unit *dmaru; @@ -364,6 +372,10 @@ dmar_parse_one_drhd(struct acpi_dmar_header *header) return ret; } dmar_register_drhd_unit(dmaru); + + if (arg) + (*(int *)arg)++; + return 0; } @@ -376,7 +388,8 @@ static void dmar_free_drhd(struct dmar_drhd_unit *dmaru) kfree(dmaru); } -static int __init dmar_parse_one_andd(struct acpi_dmar_header *header) +static int __init dmar_parse_one_andd(struct acpi_dmar_header *header, + void *arg) { struct acpi_dmar_andd *andd = (void *)header; @@ -398,7 +411,7 @@ static int __init dmar_parse_one_andd(struct acpi_dmar_header *header) #ifdef CONFIG_ACPI_NUMA static int __init -dmar_parse_one_rhsa(struct acpi_dmar_header *header) +dmar_parse_one_rhsa(struct acpi_dmar_header *header, void *arg) { struct acpi_dmar_rhsa *rhsa; struct dmar_drhd_unit *drhd; @@ -425,6 +438,8 @@ dmar_parse_one_rhsa(struct acpi_dmar_header *header) return 0; } +#else +#define dmar_parse_one_rhsa dmar_res_noop #endif static void __init @@ -486,6 +501,52 @@ static int __init dmar_table_detect(void) return (ACPI_SUCCESS(status) ? 1 : 0); } +static int dmar_walk_resources(struct acpi_dmar_header *start, size_t len, + struct dmar_res_callback *cb) +{ + int ret = 0; + struct acpi_dmar_header *iter, *next; + struct acpi_dmar_header *end = ((void *)start) + len; + + for (iter = start; iter < end && ret == 0; iter = next) { + next = (void *)iter + iter->length; + if (iter->length == 0) { + /* Avoid looping forever on bad ACPI tables */ + pr_debug(FW_BUG "Invalid 0-length structure\n"); + break; + } else if (next > end) { + /* Avoid passing table end */ + pr_warn(FW_BUG "record passes table end\n"); + ret = -EINVAL; + break; + } + + if (cb->print_entry) + dmar_table_print_dmar_entry(iter); + + if (iter->type >= ACPI_DMAR_TYPE_RESERVED) { + /* continue for forward compatibility */ + pr_debug("Unknown DMAR structure type %d\n", + iter->type); + } else if (cb->cb[iter->type]) { + ret = cb->cb[iter->type](iter, cb->arg[iter->type]); + } else if (!cb->ignore_unhandled) { + pr_warn("No handler for DMAR structure type %d\n", + iter->type); + ret = -EINVAL; + } + } + + return ret; +} + +static inline int dmar_walk_dmar_table(struct acpi_table_dmar *dmar, + struct dmar_res_callback *cb) +{ + return dmar_walk_resources((struct acpi_dmar_header *)(dmar + 1), + dmar->header.length - sizeof(*dmar), cb); +} + /** * parse_dmar_table - parses the DMA reporting table */ @@ -493,9 +554,18 @@ static int __init parse_dmar_table(void) { struct acpi_table_dmar *dmar; - struct acpi_dmar_header *entry_header; int ret = 0; int drhd_count = 0; + struct dmar_res_callback cb = { + .print_entry = true, + .ignore_unhandled = true, + .arg[ACPI_DMAR_TYPE_HARDWARE_UNIT] = &drhd_count, + .cb[ACPI_DMAR_TYPE_HARDWARE_UNIT] = &dmar_parse_one_drhd, + .cb[ACPI_DMAR_TYPE_RESERVED_MEMORY] = &dmar_parse_one_rmrr, + .cb[ACPI_DMAR_TYPE_ATSR] = &dmar_parse_one_atsr, + .cb[ACPI_DMAR_HARDWARE_AFFINITY] = &dmar_parse_one_rhsa, + .cb[ACPI_DMAR_TYPE_ANDD] = &dmar_parse_one_andd, + }; /* * Do it again, earlier dmar_tbl mapping could be mapped with @@ -520,50 +590,10 @@ parse_dmar_table(void) pr_info("Host address width %d\n", dmar->width + 1); - entry_header = (struct acpi_dmar_header *)(dmar + 1); - while (((unsigned long)entry_header) < - (((unsigned long)dmar) + dmar_tbl->length)) { - /* Avoid looping forever on bad ACPI tables */ - if (entry_header->length == 0) { - pr_warn("Invalid 0-length structure\n"); - ret = -EINVAL; - break; - } - - dmar_table_print_dmar_entry(entry_header); - - switch (entry_header->type) { - case ACPI_DMAR_TYPE_HARDWARE_UNIT: - drhd_count++; - ret = dmar_parse_one_drhd(entry_header); - break; - case ACPI_DMAR_TYPE_RESERVED_MEMORY: - ret = dmar_parse_one_rmrr(entry_header); - break; - case ACPI_DMAR_TYPE_ATSR: - ret = dmar_parse_one_atsr(entry_header); - break; - case ACPI_DMAR_HARDWARE_AFFINITY: -#ifdef CONFIG_ACPI_NUMA - ret = dmar_parse_one_rhsa(entry_header); -#endif - break; - case ACPI_DMAR_TYPE_ANDD: - ret = dmar_parse_one_andd(entry_header); - break; - default: - pr_warn("Unknown DMAR structure type %d\n", - entry_header->type); - ret = 0; /* for forward compatibility */ - break; - } - if (ret) - break; - - entry_header = ((void *)entry_header + entry_header->length); - } - if (drhd_count == 0) + ret = dmar_walk_dmar_table(dmar, &cb); + if (ret == 0 && drhd_count == 0) pr_warn(FW_BUG "No DRHD structure found in DMAR table\n"); + return ret; } @@ -762,76 +792,60 @@ static void warn_invalid_dmar(u64 addr, const char *message) dmi_get_system_info(DMI_PRODUCT_VERSION)); } -static int __init check_zero_address(void) +static int __ref +dmar_validate_one_drhd(struct acpi_dmar_header *entry, void *arg) { - struct acpi_table_dmar *dmar; - struct acpi_dmar_header *entry_header; struct acpi_dmar_hardware_unit *drhd; + void __iomem *addr; + u64 cap, ecap; - dmar = (struct acpi_table_dmar *)dmar_tbl; - entry_header = (struct acpi_dmar_header *)(dmar + 1); - - while (((unsigned long)entry_header) < - (((unsigned long)dmar) + dmar_tbl->length)) { - /* Avoid looping forever on bad ACPI tables */ - if (entry_header->length == 0) { - pr_warn("Invalid 0-length structure\n"); - return 0; - } - - if (entry_header->type == ACPI_DMAR_TYPE_HARDWARE_UNIT) { - void __iomem *addr; - u64 cap, ecap; - - drhd = (void *)entry_header; - if (!drhd->address) { - warn_invalid_dmar(0, ""); - goto failed; - } + drhd = (void *)entry; + if (!drhd->address) { + warn_invalid_dmar(0, ""); + return -EINVAL; + } - addr = early_ioremap(drhd->address, VTD_PAGE_SIZE); - if (!addr ) { - printk("IOMMU: can't validate: %llx\n", drhd->address); - goto failed; - } - cap = dmar_readq(addr + DMAR_CAP_REG); - ecap = dmar_readq(addr + DMAR_ECAP_REG); - early_iounmap(addr, VTD_PAGE_SIZE); - if (cap == (uint64_t)-1 && ecap == (uint64_t)-1) { - warn_invalid_dmar(drhd->address, - " returns all ones"); - goto failed; - } - } + addr = early_ioremap(drhd->address, VTD_PAGE_SIZE); + if (!addr) { + pr_warn("IOMMU: can't validate: %llx\n", drhd->address); + return -EINVAL; + } + cap = dmar_readq(addr + DMAR_CAP_REG); + ecap = dmar_readq(addr + DMAR_ECAP_REG); + early_iounmap(addr, VTD_PAGE_SIZE); - entry_header = ((void *)entry_header + entry_header->length); + if (cap == (uint64_t)-1 && ecap == (uint64_t)-1) { + warn_invalid_dmar(drhd->address, " returns all ones"); + return -EINVAL; } - return 1; -failed: return 0; } int __init detect_intel_iommu(void) { int ret; + struct dmar_res_callback validate_drhd_cb = { + .cb[ACPI_DMAR_TYPE_HARDWARE_UNIT] = &dmar_validate_one_drhd, + .ignore_unhandled = true, + }; down_write(&dmar_global_lock); ret = dmar_table_detect(); if (ret) - ret = check_zero_address(); - { - if (ret && !no_iommu && !iommu_detected && !dmar_disabled) { - iommu_detected = 1; - /* Make sure ACS will be enabled */ - pci_request_acs(); - } + ret = !dmar_walk_dmar_table((struct acpi_table_dmar *)dmar_tbl, + &validate_drhd_cb); + if (ret && !no_iommu && !iommu_detected && !dmar_disabled) { + iommu_detected = 1; + /* Make sure ACS will be enabled */ + pci_request_acs(); + } #ifdef CONFIG_X86 - if (ret) - x86_init.iommu.iommu_init = intel_iommu_init; + if (ret) + x86_init.iommu.iommu_init = intel_iommu_init; #endif - } + early_acpi_os_unmap_memory((void __iomem *)dmar_tbl, dmar_tbl_size); dmar_tbl = NULL; up_write(&dmar_global_lock); diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 58cc2b75d7ae..d0c37d59e6be 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -3658,7 +3658,7 @@ static inline void init_iommu_pm_ops(void) {} #endif /* CONFIG_PM */ -int __init dmar_parse_one_rmrr(struct acpi_dmar_header *header) +int __init dmar_parse_one_rmrr(struct acpi_dmar_header *header, void *arg) { struct acpi_dmar_reserved_memory *rmrr; struct dmar_rmrr_unit *rmrru; @@ -3684,7 +3684,7 @@ int __init dmar_parse_one_rmrr(struct acpi_dmar_header *header) return 0; } -int __init dmar_parse_one_atsr(struct acpi_dmar_header *hdr) +int __init dmar_parse_one_atsr(struct acpi_dmar_header *hdr, void *arg) { struct acpi_dmar_atsr *atsr; struct dmar_atsr_unit *atsru; diff --git a/include/linux/dmar.h b/include/linux/dmar.h index 1deece46a0ca..fac8ca34f9a8 100644 --- a/include/linux/dmar.h +++ b/include/linux/dmar.h @@ -115,22 +115,21 @@ extern int dmar_remove_dev_scope(struct dmar_pci_notify_info *info, extern int detect_intel_iommu(void); extern int enable_drhd_fault_handling(void); +static inline int dmar_res_noop(struct acpi_dmar_header *hdr, void *arg) +{ + return 0; +} + #ifdef CONFIG_INTEL_IOMMU extern int iommu_detected, no_iommu; extern int intel_iommu_init(void); -extern int dmar_parse_one_rmrr(struct acpi_dmar_header *header); -extern int dmar_parse_one_atsr(struct acpi_dmar_header *header); +extern int dmar_parse_one_rmrr(struct acpi_dmar_header *header, void *arg); +extern int dmar_parse_one_atsr(struct acpi_dmar_header *header, void *arg); extern int dmar_iommu_notify_scope_dev(struct dmar_pci_notify_info *info); #else /* !CONFIG_INTEL_IOMMU: */ static inline int intel_iommu_init(void) { return -ENODEV; } -static inline int dmar_parse_one_rmrr(struct acpi_dmar_header *header) -{ - return 0; -} -static inline int dmar_parse_one_atsr(struct acpi_dmar_header *header) -{ - return 0; -} +#define dmar_parse_one_rmrr dmar_res_noop +#define dmar_parse_one_atsr dmar_res_noop static inline int dmar_iommu_notify_scope_dev(struct dmar_pci_notify_info *info) { return 0;