From patchwork Sat Apr 18 01:35:19 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 6236121 Return-Path: X-Original-To: patchwork-linux-nvdimm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 31340BF4A6 for ; Sat, 18 Apr 2015 01:38:03 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1B1C120398 for ; Sat, 18 Apr 2015 01:38:02 +0000 (UTC) Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 199362039D for ; Sat, 18 Apr 2015 01:38:01 +0000 (UTC) Received: from ml01.vlan14.01.org (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 0A35D813A4; Fri, 17 Apr 2015 18:38:01 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by ml01.01.org (Postfix) with ESMTP id 43C8281388 for ; Fri, 17 Apr 2015 18:38:00 -0700 (PDT) Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga102.jf.intel.com with ESMTP; 17 Apr 2015 18:38:00 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.11,598,1422950400"; d="scan'208";a="711200137" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.23.232.36]) by fmsmga002.fm.intel.com with ESMTP; 17 Apr 2015 18:37:59 -0700 From: Dan Williams To: linux-nvdimm@lists.01.org Date: Fri, 17 Apr 2015 21:35:19 -0400 Message-ID: <20150418013519.25237.16129.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <20150418013256.25237.96403.stgit@dwillia2-desk3.amr.corp.intel.com> References: <20150418013256.25237.96403.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.17.1-8-g92dd MIME-Version: 1.0 Cc: Ingo Molnar , linux-kernel@vger.kernel.org, Andy Lutomirski , Jens Axboe , "H. Peter Anvin" , Christoph Hellwig Subject: [Linux-nvdimm] [PATCH 01/21] e820, efi: add ACPI 6.0 persistent memory types X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, T_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 ACPI 6.0 formalizes e820-type-7 and efi-type-14 as persistent memory. Mark it "reserved" and allow it to be claimed by a persistent memory device driver. This definition is in addition to the Linux kernel's existing type-12 definition that was recently added in support of shipping platforms with NVDIMM support that predate ACPI 6.0 (which now classifies type-12 as OEM reserved). We may choose to exploit this wealth of definitions for NVDIMMs to differentiate E820_PRAM (type-12) from E820_PMEM (type-7). One potential differentiation is that PMEM is not backed by struct page by default in contrast to PRAM. For now, they are effectively treated as aliases by the mm. Note, /proc/iomem can be consulted for differentiating legacy "Persistent RAM" E820_PRAM vs standard "Persistent I/O Memory" E820_PMEM. Cc: Andy Lutomirski Cc: Boaz Harrosh Cc: H. Peter Anvin Cc: Jens Axboe Cc: Ingo Molnar Cc: Christoph Hellwig Signed-off-by: Dan Williams Reviewed-by: Ross Zwisler --- arch/arm64/kernel/efi.c | 1 + arch/ia64/kernel/efi.c | 1 + arch/x86/boot/compressed/eboot.c | 4 ++++ arch/x86/include/uapi/asm/e820.h | 1 + arch/x86/kernel/e820.c | 25 +++++++++++++++++++------ arch/x86/platform/efi/efi.c | 3 +++ include/linux/efi.h | 3 ++- 7 files changed, 31 insertions(+), 7 deletions(-) diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c index ab21e0d58278..9d4aa18f2a82 100644 --- a/arch/arm64/kernel/efi.c +++ b/arch/arm64/kernel/efi.c @@ -158,6 +158,7 @@ static __init int is_reserve_region(efi_memory_desc_t *md) case EFI_BOOT_SERVICES_CODE: case EFI_BOOT_SERVICES_DATA: case EFI_CONVENTIONAL_MEMORY: + case EFI_PERSISTENT_MEMORY: return 0; default: break; diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c index c52d7540dc05..cd8b7485e396 100644 --- a/arch/ia64/kernel/efi.c +++ b/arch/ia64/kernel/efi.c @@ -1227,6 +1227,7 @@ efi_initialize_iomem_resources(struct resource *code_resource, case EFI_RUNTIME_SERVICES_CODE: case EFI_RUNTIME_SERVICES_DATA: case EFI_ACPI_RECLAIM_MEMORY: + case EFI_PERSISTENT_MEMORY: default: name = "reserved"; break; diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c index ef17683484e9..dde5bf7726f4 100644 --- a/arch/x86/boot/compressed/eboot.c +++ b/arch/x86/boot/compressed/eboot.c @@ -1222,6 +1222,10 @@ static efi_status_t setup_e820(struct boot_params *params, e820_type = E820_NVS; break; + case EFI_PERSISTENT_MEMORY: + e820_type = E820_PMEM; + break; + default: continue; } diff --git a/arch/x86/include/uapi/asm/e820.h b/arch/x86/include/uapi/asm/e820.h index 960a8a9dc4ab..0f457e6eab18 100644 --- a/arch/x86/include/uapi/asm/e820.h +++ b/arch/x86/include/uapi/asm/e820.h @@ -32,6 +32,7 @@ #define E820_ACPI 3 #define E820_NVS 4 #define E820_UNUSABLE 5 +#define E820_PMEM 7 /* * This is a non-standardized way to represent ADR or NVDIMM regions that diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index 11cc7d54ec3f..410af501a941 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -137,6 +137,8 @@ static void __init e820_print_type(u32 type) case E820_RESERVED_KERN: printk(KERN_CONT "usable"); break; + case E820_PMEM: + case E820_PRAM: case E820_RESERVED: printk(KERN_CONT "reserved"); break; @@ -149,9 +151,6 @@ static void __init e820_print_type(u32 type) case E820_UNUSABLE: printk(KERN_CONT "unusable"); break; - case E820_PRAM: - printk(KERN_CONT "persistent (type %u)", type); - break; default: printk(KERN_CONT "type %u", type); break; @@ -919,10 +918,26 @@ static inline const char *e820_type_to_string(int e820_type) case E820_NVS: return "ACPI Non-volatile Storage"; case E820_UNUSABLE: return "Unusable memory"; case E820_PRAM: return "Persistent RAM"; + case E820_PMEM: return "Persistent I/O Memory"; default: return "reserved"; } } +static bool do_mark_busy(u32 type, struct resource *res) +{ + if (res->start < (1ULL<<20)) + return true; + + switch (type) { + case E820_RESERVED: + case E820_PRAM: + case E820_PMEM: + return false; + default: + return true; + } +} + /* * Mark e820 reserved areas as busy for the resource manager. */ @@ -952,9 +967,7 @@ void __init e820_reserve_resources(void) * pci device BAR resource and insert them later in * pcibios_resource_survey() */ - if (((e820.map[i].type != E820_RESERVED) && - (e820.map[i].type != E820_PRAM)) || - res->start < (1ULL<<20)) { + if (do_mark_busy(e820.map[i].type, res)) { res->flags |= IORESOURCE_BUSY; insert_resource(&iomem_resource, res); } diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c index dbc8627a5cdf..a116e236ac3f 100644 --- a/arch/x86/platform/efi/efi.c +++ b/arch/x86/platform/efi/efi.c @@ -145,6 +145,9 @@ static void __init do_add_efi_memmap(void) case EFI_UNUSABLE_MEMORY: e820_type = E820_UNUSABLE; break; + case EFI_PERSISTENT_MEMORY: + e820_type = E820_PMEM; + break; default: /* * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE diff --git a/include/linux/efi.h b/include/linux/efi.h index cf7e431cbc73..28868504aa17 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -85,7 +85,8 @@ typedef struct { #define EFI_MEMORY_MAPPED_IO 11 #define EFI_MEMORY_MAPPED_IO_PORT_SPACE 12 #define EFI_PAL_CODE 13 -#define EFI_MAX_MEMORY_TYPE 14 +#define EFI_PERSISTENT_MEMORY 14 +#define EFI_MAX_MEMORY_TYPE 15 /* Attribute values: */ #define EFI_MEMORY_UC ((u64)0x0000000000000001ULL) /* uncached */