Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759677AbbEEQJ0 (ORCPT ); Tue, 5 May 2015 12:09:26 -0400 Received: from mail-by2on0119.outbound.protection.outlook.com ([207.46.100.119]:37649 "EHLO na01-by2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2993330AbbEEPNO (ORCPT ); Tue, 5 May 2015 11:13:14 -0400 Authentication-Results: spf=temperror (sender IP is 165.204.84.221) smtp.mailfrom=amd.com; arm.com; dkim=none (message not signed) header.d=none; X-WSS-ID: 0NNVU9S-07-15I-02 X-M-MSG: From: Suravee Suthikulpanit To: , , , , , , CC: , , , , , , , , , , , , "Suravee Suthikulpanit" Subject: [V2 PATCH 2/5] arm64 : Introduce support for ACPI _CCA object Date: Tue, 5 May 2015 10:12:06 -0500 Message-ID: <1430838729-21572-3-git-send-email-Suravee.Suthikulpanit@amd.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1430838729-21572-1-git-send-email-Suravee.Suthikulpanit@amd.com> References: <1430838729-21572-1-git-send-email-Suravee.Suthikulpanit@amd.com> MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:165.204.84.221;CTRY:US;IPV:NLI;EFV:NLI;SFV:NSPM;SFS:(10019020)(6009001)(199003)(189002)(86362001)(575784001)(2950100001)(62966003)(77156002)(48376002)(92566002)(50466002)(19580395003)(19580405001)(50226001)(76176999)(47776003)(2201001)(50986999)(87936001)(77096005)(53416004)(15975445007)(36756003)(46102003)(106466001)(229853001);DIR:OUT;SFP:1102;SCL:1;SRVR:BLUPR02MB068;H:atltwp01.amd.com;FPR:;SPF:TempError;MLV:sfv;A:1;MX:1;LANG:en; X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:BLUPR02MB068; X-Microsoft-Antispam-PRVS: X-Exchange-Antispam-Report-Test: UriScan:; X-Exchange-Antispam-Report-CFA-Test: BCL:0;PCL:0;RULEID:(601004)(5005006)(3002001);SRVR:BLUPR02MB068;BCL:0;PCL:0;RULEID:;SRVR:BLUPR02MB068; X-Forefront-PRVS: 0567A15835 X-OriginatorOrg: amd4.onmicrosoft.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 May 2015 15:13:06.4260 (UTC) X-MS-Exchange-CrossTenant-Id: fde4dada-be84-483f-92cc-e026cbee8e96 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=fde4dada-be84-483f-92cc-e026cbee8e96;Ip=[165.204.84.221];Helo=[atltwp01.amd.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BLUPR02MB068 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5966 Lines: 201 >From http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf, section 6.2.17 _CCA states that ARM platforms require ACPI _CCA object to be specified for DMA-cabpable devices. This patch introduces ACPI_MUST_HAVE_CCA in arm64 Kconfig to specify such requirement. In this case of missing _CCA, arm64 would assign dummy_dma_ops to disable DMA capability of the device. Signed-off-by: Mark Salter Signed-off-by: Suravee Suthikulpanit --- arch/arm64/Kconfig | 2 + arch/arm64/include/asm/dma-mapping.h | 18 +++++- arch/arm64/mm/dma-mapping.c | 104 +++++++++++++++++++++++++++++++++++ 3 files changed, 122 insertions(+), 2 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 4269dba..4f4bbaaf 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1,7 +1,9 @@ config ARM64 def_bool y select ACPI_GENERIC_GSI if ACPI + select ACPI_MUST_HAVE_CCA if ACPI select ACPI_REDUCED_HARDWARE_ONLY if ACPI + select ACPI_SUPPORT_CCA_ZERO if ACPI select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE select ARCH_HAS_ELF_RANDOMIZE select ARCH_HAS_GCOV_PROFILE_ALL diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h index 9437e3d..f0d6d0b 100644 --- a/arch/arm64/include/asm/dma-mapping.h +++ b/arch/arm64/include/asm/dma-mapping.h @@ -18,6 +18,7 @@ #ifdef __KERNEL__ +#include #include #include @@ -28,13 +29,23 @@ #define DMA_ERROR_CODE (~(dma_addr_t)0) extern struct dma_map_ops *dma_ops; +extern struct dma_map_ops dummy_dma_ops; static inline struct dma_map_ops *__generic_dma_ops(struct device *dev) { - if (unlikely(!dev) || !dev->archdata.dma_ops) + if (unlikely(!dev)) return dma_ops; - else + else if (dev->archdata.dma_ops) return dev->archdata.dma_ops; + else if (acpi_disabled) + return dma_ops; + + /* + * When ACPI is enabled, if arch_set_dma_ops is not called, + * we will disable device DMA capability by setting it + * to dummy_dma_ops. + */ + return &dummy_dma_ops; } static inline struct dma_map_ops *get_dma_ops(struct device *dev) @@ -48,6 +59,9 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev) static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, struct iommu_ops *iommu, bool coherent) { + if (!acpi_disabled && !dev->archdata.dma_ops) + dev->archdata.dma_ops = dma_ops; + dev->archdata.dma_coherent = coherent; } #define arch_setup_dma_ops arch_setup_dma_ops diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c index ef7d112..31d2b52 100644 --- a/arch/arm64/mm/dma-mapping.c +++ b/arch/arm64/mm/dma-mapping.c @@ -415,6 +415,110 @@ out: return -ENOMEM; } +/******************************************** + * The following APIs are for dummy DMA ops * + ********************************************/ + +static void *__dummy_alloc(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t flags, + struct dma_attrs *attrs) +{ + return NULL; +} + +static void __dummy_free(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle, + struct dma_attrs *attrs) +{ +} + +static int __dummy_mmap(struct device *dev, + struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, size_t size, + struct dma_attrs *attrs) +{ + return -ENXIO; +} + +static dma_addr_t __dummy_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + return DMA_ERROR_CODE; +} + +static void __dummy_unmap_page(struct device *dev, dma_addr_t dev_addr, + size_t size, enum dma_data_direction dir, + struct dma_attrs *attrs) +{ +} + +static int __dummy_map_sg(struct device *dev, struct scatterlist *sgl, + int nelems, enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + return 0; +} + +static void __dummy_unmap_sg(struct device *dev, + struct scatterlist *sgl, int nelems, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ +} + +static void __dummy_sync_single_for_cpu(struct device *dev, + dma_addr_t dev_addr, size_t size, + enum dma_data_direction dir) +{ +} + +static void __dummy_sync_single_for_device(struct device *dev, + dma_addr_t dev_addr, size_t size, + enum dma_data_direction dir) +{ +} + +static void __dummy_sync_sg_for_cpu(struct device *dev, + struct scatterlist *sgl, int nelems, + enum dma_data_direction dir) +{ +} + +static void __dummy_sync_sg_for_device(struct device *dev, + struct scatterlist *sgl, int nelems, + enum dma_data_direction dir) +{ +} + +static int __dummy_mapping_error(struct device *hwdev, dma_addr_t dma_addr) +{ + return 1; +} + +static int __dummy_dma_supported(struct device *hwdev, u64 mask) +{ + return 0; +} + +struct dma_map_ops dummy_dma_ops = { + .alloc = __dummy_alloc, + .free = __dummy_free, + .mmap = __dummy_mmap, + .map_page = __dummy_map_page, + .unmap_page = __dummy_unmap_page, + .map_sg = __dummy_map_sg, + .unmap_sg = __dummy_unmap_sg, + .sync_single_for_cpu = __dummy_sync_single_for_cpu, + .sync_single_for_device = __dummy_sync_single_for_device, + .sync_sg_for_cpu = __dummy_sync_sg_for_cpu, + .sync_sg_for_device = __dummy_sync_sg_for_device, + .mapping_error = __dummy_mapping_error, + .dma_supported = __dummy_dma_supported, +}; +EXPORT_SYMBOL(dummy_dma_ops); + static int __init arm64_dma_init(void) { int ret; -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/