From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750730AbXBKQpd (ORCPT ); Sun, 11 Feb 2007 11:45:33 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750728AbXBKQpd (ORCPT ); Sun, 11 Feb 2007 11:45:33 -0500 Received: from mtagate4.uk.ibm.com ([195.212.29.137]:42888 "EHLO mtagate4.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750726AbXBKQpc (ORCPT ); Sun, 11 Feb 2007 11:45:32 -0500 Subject: Re: [PATCH] iomap: make PCI iomap stuff excluded when PCI isn't configured From: Martin Schwidefsky Reply-To: schwidefsky@de.ibm.com To: Al Viro Cc: Linus Torvalds , Tejun Heo , Heiko Carstens , Andrew Morton , Jeff Garzik , linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org In-Reply-To: <20070210235553.GP10050@ftp.linux.org.uk> References: <20070210114314.GB12642@osiris.boeblingen.de.ibm.com> <45CE0434.30105@gmail.com> <20070210194630.GA13416@osiris.ibm.com> <45CE43B5.2020806@gmail.com> <20070210225033.GO10050@ftp.linux.org.uk> <20070210235553.GP10050@ftp.linux.org.uk> Content-Type: text/plain Organization: IBM Corporation Date: Sun, 11 Feb 2007 17:45:33 +0100 Message-Id: <1171212333.23147.10.camel@localhost> Mime-Version: 1.0 X-Mailer: Evolution 2.6.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 2007-02-10 at 23:55 +0000, Al Viro wrote: > FWIW, the current picture wrt io-related stuff looks so: > > s390: no ioport_map, no ioread*/iowrite*, no port IO except for (in|out)b(_p|) s390 does not even need (in|out)b(_p|). I wondered what else from io.h do we not need. The answer is: almost nothing. With the devres patch from Al and the dma-mapping patch from Heiko we can get rid of iomem and all associated definitions. -- blue skies, Martin. Martin Schwidefsky Linux for zSeries Development & Services IBM Deutschland Entwicklung GmbH "Reality continues to ruin my life." - Calvin. -- From: Martin Schwidefsky [S390] cleanup io.h Remove code to access I/O memory. There is no such thing on s390. Signed-off-by: Martin Schwidefsky --- arch/s390/Kconfig | 3 ++ arch/s390/mm/Makefile | 2 - arch/s390/mm/ioremap.c | 58 -------------------------------------------- include/asm-s390/io.h | 64 ------------------------------------------------- 4 files changed, 5 insertions(+), 122 deletions(-) diff -urpN linux-2.6/arch/s390/Kconfig linux-2.6-patched/arch/s390/Kconfig --- linux-2.6/arch/s390/Kconfig 2007-02-11 17:24:37.000000000 +0100 +++ linux-2.6-patched/arch/s390/Kconfig 2007-02-11 17:25:30.000000000 +0100 @@ -40,6 +40,9 @@ config GENERIC_TIME config NO_IOPORT def_bool y +config NO_IOMEM + def_bool y + mainmenu "Linux Kernel Configuration" config S390 diff -urpN linux-2.6/arch/s390/mm/ioremap.c linux-2.6-patched/arch/s390/mm/ioremap.c --- linux-2.6/arch/s390/mm/ioremap.c 2006-12-09 21:08:18.000000000 +0100 +++ linux-2.6-patched/arch/s390/mm/ioremap.c 1970-01-01 01:00:00.000000000 +0100 @@ -1,58 +0,0 @@ -/* - * arch/s390/mm/ioremap.c - * - * S390 version - * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation - * Author(s): Hartmut Penner (hp@de.ibm.com) - * - * Derived from "arch/i386/mm/extable.c" - * (C) Copyright 1995 1996 Linus Torvalds - * - * Re-map IO memory to kernel address space so that we can access it. - * This is needed for high PCI addresses that aren't mapped in the - * 640k-1MB IO memory area on PC's - */ - -#include -#include -#include -#include - -/* - * Generic mapping function (not visible outside): - */ - -/* - * Remap an arbitrary physical address space into the kernel virtual - * address space. Needed when the kernel wants to access high addresses - * directly. - */ -void * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags) -{ - void * addr; - struct vm_struct * area; - - if (phys_addr < virt_to_phys(high_memory)) - return phys_to_virt(phys_addr); - if (phys_addr & ~PAGE_MASK) - return NULL; - size = PAGE_ALIGN(size); - if (!size || size > phys_addr + size) - return NULL; - area = get_vm_area(size, VM_IOREMAP); - if (!area) - return NULL; - addr = area->addr; - if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size, - phys_addr, __pgprot(flags))) { - vfree(addr); - return NULL; - } - return addr; -} - -void iounmap(void *addr) -{ - if (addr > high_memory) - vfree(addr); -} diff -urpN linux-2.6/arch/s390/mm/Makefile linux-2.6-patched/arch/s390/mm/Makefile --- linux-2.6/arch/s390/mm/Makefile 2006-12-09 21:08:18.000000000 +0100 +++ linux-2.6-patched/arch/s390/mm/Makefile 2007-02-11 17:23:02.000000000 +0100 @@ -2,6 +2,6 @@ # Makefile for the linux s390-specific parts of the memory manager. # -obj-y := init.o fault.o ioremap.o extmem.o mmap.o vmem.o +obj-y := init.o fault.o extmem.o mmap.o vmem.o obj-$(CONFIG_CMM) += cmm.o diff -urpN linux-2.6/include/asm-s390/io.h linux-2.6-patched/include/asm-s390/io.h --- linux-2.6/include/asm-s390/io.h 2007-02-07 15:42:46.000000000 +0100 +++ linux-2.6-patched/include/asm-s390/io.h 2007-02-11 17:19:32.000000000 +0100 @@ -18,8 +18,6 @@ #define IO_SPACE_LIMIT 0xffffffff -#define __io_virt(x) ((void *)(PAGE_OFFSET | (unsigned long)(x))) - /* * Change virtual addresses to physical addresses and vv. * These are pretty trivial @@ -38,28 +36,9 @@ static inline unsigned long virt_to_phys static inline void * phys_to_virt(unsigned long address) { - return __io_virt(address); -} - -extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags); - -static inline void * ioremap (unsigned long offset, unsigned long size) -{ - return __ioremap(offset, size, 0); -} - -/* - * This one maps high address device memory and turns off caching for that area. - * it's useful if some control registers are in such an area and write combining - * or read caching is not desirable: - */ -static inline void * ioremap_nocache (unsigned long offset, unsigned long size) -{ - return __ioremap(offset, size, 0); + return (void *) address; } -extern void iounmap(void *addr); - /* * IO bus memory addresses are also 1:1 with the physical address */ @@ -67,47 +46,6 @@ extern void iounmap(void *addr); #define bus_to_virt phys_to_virt /* - * readX/writeX() are used to access memory mapped devices. On some - * architectures the memory mapped IO stuff needs to be accessed - * differently. - */ - -#define readb(addr) (*(volatile unsigned char *) __io_virt(addr)) -#define readw(addr) (*(volatile unsigned short *) __io_virt(addr)) -#define readl(addr) (*(volatile unsigned int *) __io_virt(addr)) -#define readq(addr) (*(volatile unsigned long long *) __io_virt(addr)) - -#define readb_relaxed(addr) readb(addr) -#define readw_relaxed(addr) readw(addr) -#define readl_relaxed(addr) readl(addr) -#define readq_relaxed(addr) readq(addr) -#define __raw_readb readb -#define __raw_readw readw -#define __raw_readl readl -#define __raw_readq readq - -#define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b)) -#define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b)) -#define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b)) -#define writeq(b,addr) (*(volatile unsigned long long *) __io_virt(addr) = (b)) -#define __raw_writeb writeb -#define __raw_writew writew -#define __raw_writel writel -#define __raw_writeq writeq - -#define memset_io(a,b,c) memset(__io_virt(a),(b),(c)) -#define memcpy_fromio(a,b,c) memcpy((a),__io_virt(b),(c)) -#define memcpy_toio(a,b,c) memcpy(__io_virt(a),(b),(c)) - -#define inb_p(addr) readb(addr) -#define inb(addr) readb(addr) - -#define outb(x,addr) ((void) writeb(x,addr)) -#define outb_p(x,addr) outb(x,addr) - -#define mmiowb() do { } while (0) - -/* * Convert a physical pointer to a virtual kernel pointer for /dev/mem * access */