From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752006AbcAZU5m (ORCPT ); Tue, 26 Jan 2016 15:57:42 -0500 Received: from mail.skyhub.de ([78.46.96.112]:41545 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751693AbcAZU5i (ORCPT ); Tue, 26 Jan 2016 15:57:38 -0500 From: Borislav Petkov To: Ingo Molnar Cc: LKML , Andrew Morton , Dan Williams , Hanjun Guo , Jakub Sitnicki , Jiang Liu , Linus Torvalds , linux-arch@vger.kernel.org, linux-mm , "Rafael J. Wysocki" Subject: [PATCH 01/17] resource: Add System RAM resource type Date: Tue, 26 Jan 2016 21:57:17 +0100 Message-Id: <1453841853-11383-2-git-send-email-bp@alien8.de> X-Mailer: git-send-email 2.3.5 In-Reply-To: <1453841853-11383-1-git-send-email-bp@alien8.de> References: <1453841853-11383-1-git-send-email-bp@alien8.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Toshi Kani The IORESOURCE_MEM I/O resource type is used for all types of memory-mapped ranges, ex. System RAM, System ROM, Video RAM, Persistent Memory, PCI Bus, PCI MMCONFIG, ACPI Tables, IOAPIC, reserved, and so on. This requires walk_system_ram_range(), walk_system_ram_res(), and region_intersects() to use strcmp() against string "System RAM" to search for System RAM ranges in the iomem table, which is inefficient. __ioremap_caller() and reserve_memtype() on x86, for instance, call walk_system_ram_range() for every request to check if a given range is in System RAM ranges. However, adding a new I/O resource type for System RAM is not a viable option, see [1]. There are approx. 3800 references to IORESOURCE_MEM in the kernel/drivers, which makes it very difficult to distinguish their usages between new type and IORESOURCE_MEM. The I/O resource types are also used by the PNP subsystem. Therefore, introduce an extended I/O resource type, IORESOURCE_SYSTEM_RAM, which consists of IORESOURCE_MEM and a new modifier flag IORESOURCE_SYSRAM, see [2]. To keep the code 'if (resource_type(r) == IORESOURCE_MEM)' still working for System RAM, resource_ext_type() is added for extracting extended type bits. Signed-off-by: Toshi Kani Cc: Andrew Morton Cc: Dan Williams Cc: Hanjun Guo Cc: Jakub Sitnicki Cc: Jiang Liu Cc: Linus Torvalds Cc: linux-arch@vger.kernel.org Cc: linux-mm Cc: "Rafael J. Wysocki" Link: http://lkml.kernel.org/r/1452020081-26534-1-git-send-email-toshi.kani@hpe.com Link[1]: http://lkml.kernel.org/r/1449168859.9855.54.camel@hpe.com Link[2]: http://lkml.kernel.org/r/CA+55aFy4WQrWexC4u2LxX9Mw2NVoznw7p3Yh=iF4Xtf7zKWnRw@mail.gmail.com Signed-off-by: Borislav Petkov --- include/linux/ioport.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 24bea087e7af..4b65d944717f 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -49,12 +49,19 @@ struct resource { #define IORESOURCE_WINDOW 0x00200000 /* forwarded by bridge */ #define IORESOURCE_MUXED 0x00400000 /* Resource is software muxed */ +#define IORESOURCE_EXT_TYPE_BITS 0x01000000 /* Resource extended types */ +#define IORESOURCE_SYSRAM 0x01000000 /* System RAM (modifier) */ + #define IORESOURCE_EXCLUSIVE 0x08000000 /* Userland may not map this resource */ + #define IORESOURCE_DISABLED 0x10000000 #define IORESOURCE_UNSET 0x20000000 /* No address assigned yet */ #define IORESOURCE_AUTO 0x40000000 #define IORESOURCE_BUSY 0x80000000 /* Driver has marked this resource busy */ +/* I/O resource extended types */ +#define IORESOURCE_SYSTEM_RAM (IORESOURCE_MEM|IORESOURCE_SYSRAM) + /* PnP IRQ specific bits (IORESOURCE_BITS) */ #define IORESOURCE_IRQ_HIGHEDGE (1<<0) #define IORESOURCE_IRQ_LOWEDGE (1<<1) @@ -170,6 +177,10 @@ static inline unsigned long resource_type(const struct resource *res) { return res->flags & IORESOURCE_TYPE_BITS; } +static inline unsigned long resource_ext_type(const struct resource *res) +{ + return res->flags & IORESOURCE_EXT_TYPE_BITS; +} /* True iff r1 completely contains r2 */ static inline bool resource_contains(struct resource *r1, struct resource *r2) { -- 2.3.5