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[209.132.180.67]) by mx.google.com with ESMTP id a205si3022185oii.95.2020.01.30.08.10.35; Thu, 30 Jan 2020 08:10:47 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@c-s.fr header.s=mail header.b=TaPe4jMx; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727458AbgA3QI6 (ORCPT + 99 others); Thu, 30 Jan 2020 11:08:58 -0500 Received: from pegase1.c-s.fr ([93.17.236.30]:52403 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727158AbgA3QIj (ORCPT ); Thu, 30 Jan 2020 11:08:39 -0500 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 487ldb5PMtz9v6KR; Thu, 30 Jan 2020 17:08:35 +0100 (CET) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=TaPe4jMx; dkim-adsp=pass; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id 2bbPt_ggsw_8; Thu, 30 Jan 2020 17:08:35 +0100 (CET) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 487ldb467sz9v6KN; Thu, 30 Jan 2020 17:08:35 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1580400515; bh=qwSNhB4tU4M4uI9IK+orfdj2cZ8ce0om+Rd7SMZd1ko=; h=In-Reply-To:References:From:Subject:To:Cc:Date:From; b=TaPe4jMxy1mY/4eTCLn6tkFykxv0muTdrZ6+9QINa8ttASGNzdWCkYCopBqnqhP9A 1E4usAYq6G5AqJm//aiSoecsbsyiHBzCy2R/0ohEEGFSxpArg/VMSkkKOsMQWRC7Ud Nw8DD3NzZRwHkl5MOIRVroo2A/rAFQ1gx5CvRWXY= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 121708B87D; Thu, 30 Jan 2020 17:08:37 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id SEjAWF7z4BRe; Thu, 30 Jan 2020 17:08:36 +0100 (CET) Received: from po14934vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 77A258B877; Thu, 30 Jan 2020 17:08:36 +0100 (CET) Received: by po14934vm.idsi0.si.c-s.fr (Postfix, from userid 0) id 4334265283; Thu, 30 Jan 2020 16:08:36 +0000 (UTC) Message-Id: <5f97f7c921ffc2113ada0f32924e409bccc8277a.1580399657.git.christophe.leroy@c-s.fr> In-Reply-To: References: From: Christophe Leroy Subject: [PATCH v5 2/6] powerpc/vdso: Remove __kernel_datapage_offset and simplify __get_datapage() To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , nathanl@linux.ibm.com, arnd@arndb.de, tglx@linutronix.de, vincenzo.frascino@arm.com, luto@kernel.org Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, x86@kernel.org Date: Thu, 30 Jan 2020 16:08:36 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The VDSO datapage and the text pages are always located immediately next to each other, so it can be hardcoded without an indirection through __kernel_datapage_offset In order to ease things, move the data page in front like other arches, that way there is no need to know the size of the library to locate the data page. Before: clock-getres-realtime-coarse: vdso: 714 nsec/call clock-gettime-realtime-coarse: vdso: 792 nsec/call clock-gettime-realtime: vdso: 1243 nsec/call After: clock-getres-realtime-coarse: vdso: 699 nsec/call clock-gettime-realtime-coarse: vdso: 784 nsec/call clock-gettime-realtime: vdso: 1231 nsec/call In the mean time, allow users to pass a constant offset to get_datapage macro. That offset will be integrated to the calculation to directly get the address of the given object inside the VDSO datapage. This avoids having to perform a subsequent addition. Signed-off-by: Christophe Leroy --- arch/powerpc/include/asm/vdso_datapage.h | 11 ++--- arch/powerpc/kernel/vdso.c | 53 +++-------------------- arch/powerpc/kernel/vdso32/cacheflush.S | 2 +- arch/powerpc/kernel/vdso32/datapage.S | 7 +-- arch/powerpc/kernel/vdso32/gettimeofday.S | 8 ++-- arch/powerpc/kernel/vdso32/vdso32.lds.S | 7 +-- arch/powerpc/kernel/vdso64/cacheflush.S | 2 +- arch/powerpc/kernel/vdso64/datapage.S | 7 +-- arch/powerpc/kernel/vdso64/gettimeofday.S | 8 ++-- arch/powerpc/kernel/vdso64/vdso64.lds.S | 7 +-- 10 files changed, 31 insertions(+), 81 deletions(-) diff --git a/arch/powerpc/include/asm/vdso_datapage.h b/arch/powerpc/include/asm/vdso_datapage.h index b9ef6cf50ea5..a361f07bec49 100644 --- a/arch/powerpc/include/asm/vdso_datapage.h +++ b/arch/powerpc/include/asm/vdso_datapage.h @@ -116,12 +116,13 @@ extern struct vdso_data *vdso_data; #else /* __ASSEMBLY__ */ -.macro get_datapage ptr, tmp +.macro get_datapage ptr, offset=0 bcl 20, 31, .+4 - mflr \ptr - addi \ptr, \ptr, (__kernel_datapage_offset - (.-4))@l - lwz \tmp, 0(\ptr) - add \ptr, \tmp, \ptr +999: mflr \ptr +#if CONFIG_PPC_PAGE_SHIFT > 14 + addis \ptr, \ptr, (_vdso_datapage + \offset - 999b)@ha +#endif + addi \ptr, \ptr, (_vdso_datapage + \offset - 999b)@l .endm #endif /* __ASSEMBLY__ */ diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c index b9a108411c0d..ebbb13d92a12 100644 --- a/arch/powerpc/kernel/vdso.c +++ b/arch/powerpc/kernel/vdso.c @@ -190,7 +190,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) * install_special_mapping or the perf counter mmap tracking code * will fail to recognise it as a vDSO (since arch_vma_name fails). */ - current->mm->context.vdso_base = vdso_base; + current->mm->context.vdso_base = vdso_base + PAGE_SIZE; /* * our vma flags don't have VM_WRITE so by default, the process isn't @@ -487,42 +487,6 @@ static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32, vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32"); } -static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32, - struct lib64_elfinfo *v64) -{ -#ifdef CONFIG_VDSO32 - Elf32_Sym *sym32; -#endif -#ifdef CONFIG_PPC64 - Elf64_Sym *sym64; - - sym64 = find_symbol64(v64, "__kernel_datapage_offset"); - if (sym64 == NULL) { - printk(KERN_ERR "vDSO64: Can't find symbol " - "__kernel_datapage_offset !\n"); - return -1; - } - *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) = - (vdso64_pages << PAGE_SHIFT) - - (sym64->st_value - VDSO64_LBASE); -#endif /* CONFIG_PPC64 */ - -#ifdef CONFIG_VDSO32 - sym32 = find_symbol32(v32, "__kernel_datapage_offset"); - if (sym32 == NULL) { - printk(KERN_ERR "vDSO32: Can't find symbol " - "__kernel_datapage_offset !\n"); - return -1; - } - *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) = - (vdso32_pages << PAGE_SHIFT) - - (sym32->st_value - VDSO32_LBASE); -#endif - - return 0; -} - - static __init int vdso_fixup_features(struct lib32_elfinfo *v32, struct lib64_elfinfo *v64) { @@ -623,9 +587,6 @@ static __init int vdso_setup(void) if (vdso_do_find_sections(&v32, &v64)) return -1; - if (vdso_fixup_datapage(&v32, &v64)) - return -1; - if (vdso_fixup_features(&v32, &v64)) return -1; @@ -765,26 +726,26 @@ static int __init vdso_init(void) vdso32_pagelist = kcalloc(vdso32_pages + 2, sizeof(struct page *), GFP_KERNEL); BUG_ON(vdso32_pagelist == NULL); + vdso32_pagelist[0] = virt_to_page(vdso_data); for (i = 0; i < vdso32_pages; i++) { struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE); get_page(pg); - vdso32_pagelist[i] = pg; + vdso32_pagelist[i + 1] = pg; } - vdso32_pagelist[i++] = virt_to_page(vdso_data); - vdso32_pagelist[i] = NULL; + vdso32_pagelist[i + 1] = NULL; #endif #ifdef CONFIG_PPC64 vdso64_pagelist = kcalloc(vdso64_pages + 2, sizeof(struct page *), GFP_KERNEL); BUG_ON(vdso64_pagelist == NULL); + vdso64_pagelist[0] = virt_to_page(vdso_data); for (i = 0; i < vdso64_pages; i++) { struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE); get_page(pg); - vdso64_pagelist[i] = pg; + vdso64_pagelist[i + 1] = pg; } - vdso64_pagelist[i++] = virt_to_page(vdso_data); - vdso64_pagelist[i] = NULL; + vdso64_pagelist[i + 1] = NULL; #endif /* CONFIG_PPC64 */ get_page(virt_to_page(vdso_data)); diff --git a/arch/powerpc/kernel/vdso32/cacheflush.S b/arch/powerpc/kernel/vdso32/cacheflush.S index 3440ddf21c8b..017843bf5382 100644 --- a/arch/powerpc/kernel/vdso32/cacheflush.S +++ b/arch/powerpc/kernel/vdso32/cacheflush.S @@ -27,7 +27,7 @@ V_FUNCTION_BEGIN(__kernel_sync_dicache) #ifdef CONFIG_PPC64 mflr r12 .cfi_register lr,r12 - get_datapage r10, r0 + get_datapage r10 mtlr r12 #endif diff --git a/arch/powerpc/kernel/vdso32/datapage.S b/arch/powerpc/kernel/vdso32/datapage.S index 217bb630f8f9..0513a2eabec8 100644 --- a/arch/powerpc/kernel/vdso32/datapage.S +++ b/arch/powerpc/kernel/vdso32/datapage.S @@ -13,9 +13,6 @@ #include .text - .global __kernel_datapage_offset; -__kernel_datapage_offset: - .long 0 /* * void *__kernel_get_syscall_map(unsigned int *syscall_count) ; @@ -31,7 +28,7 @@ V_FUNCTION_BEGIN(__kernel_get_syscall_map) mflr r12 .cfi_register lr,r12 mr. r4,r3 - get_datapage r3, r0 + get_datapage r3 mtlr r12 addi r3,r3,CFG_SYSCALL_MAP32 beqlr @@ -52,7 +49,7 @@ V_FUNCTION_BEGIN(__kernel_get_tbfreq) .cfi_startproc mflr r12 .cfi_register lr,r12 - get_datapage r3, r0 + get_datapage r3 lwz r4,(CFG_TB_TICKS_PER_SEC + 4)(r3) lwz r3,CFG_TB_TICKS_PER_SEC(r3) mtlr r12 diff --git a/arch/powerpc/kernel/vdso32/gettimeofday.S b/arch/powerpc/kernel/vdso32/gettimeofday.S index a3951567118a..0bbdce0f2a9c 100644 --- a/arch/powerpc/kernel/vdso32/gettimeofday.S +++ b/arch/powerpc/kernel/vdso32/gettimeofday.S @@ -34,7 +34,7 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday) mr. r10,r3 /* r10 saves tv */ mr r11,r4 /* r11 saves tz */ - get_datapage r9, r0 + get_datapage r9 beq 3f LOAD_REG_IMMEDIATE(r7, 1000000) /* load up USEC_PER_SEC */ bl __do_get_tspec@local /* get sec/usec from tb & kernel */ @@ -79,7 +79,7 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime) mflr r12 /* r12 saves lr */ .cfi_register lr,r12 mr r11,r4 /* r11 saves tp */ - get_datapage r9, r0 + get_datapage r9 LOAD_REG_IMMEDIATE(r7, NSEC_PER_SEC) /* load up NSEC_PER_SEC */ beq cr5, .Lcoarse_clocks .Lprecise_clocks: @@ -206,7 +206,7 @@ V_FUNCTION_BEGIN(__kernel_clock_getres) mflr r12 .cfi_register lr,r12 - get_datapage r3, r0 + get_datapage r3 lwz r5, CLOCK_HRTIMER_RES(r3) mtlr r12 1: li r3,0 @@ -240,7 +240,7 @@ V_FUNCTION_BEGIN(__kernel_time) .cfi_register lr,r12 mr r11,r3 /* r11 holds t */ - get_datapage r9, r0 + get_datapage r9 lwz r3,STAMP_XTIME_SEC+LOPART(r9) diff --git a/arch/powerpc/kernel/vdso32/vdso32.lds.S b/arch/powerpc/kernel/vdso32/vdso32.lds.S index 5206c2eb2a1d..6cf729612268 100644 --- a/arch/powerpc/kernel/vdso32/vdso32.lds.S +++ b/arch/powerpc/kernel/vdso32/vdso32.lds.S @@ -4,6 +4,7 @@ * library */ #include +#include #ifdef __LITTLE_ENDIAN__ OUTPUT_FORMAT("elf32-powerpcle", "elf32-powerpcle", "elf32-powerpcle") @@ -15,6 +16,7 @@ ENTRY(_start) SECTIONS { + PROVIDE(_vdso_datapage = . - PAGE_SIZE); . = VDSO32_LBASE + SIZEOF_HEADERS; .hash : { *(.hash) } :text @@ -138,11 +140,6 @@ VERSION { VDSO_VERSION_STRING { global: - /* - * Has to be there for the kernel to find - */ - __kernel_datapage_offset; - __kernel_get_syscall_map; #ifndef CONFIG_PPC_BOOK3S_601 __kernel_gettimeofday; diff --git a/arch/powerpc/kernel/vdso64/cacheflush.S b/arch/powerpc/kernel/vdso64/cacheflush.S index cab14324242b..61985de5758f 100644 --- a/arch/powerpc/kernel/vdso64/cacheflush.S +++ b/arch/powerpc/kernel/vdso64/cacheflush.S @@ -25,7 +25,7 @@ V_FUNCTION_BEGIN(__kernel_sync_dicache) .cfi_startproc mflr r12 .cfi_register lr,r12 - get_datapage r10, r0 + get_datapage r10 mtlr r12 lwz r7,CFG_DCACHE_BLOCKSZ(r10) diff --git a/arch/powerpc/kernel/vdso64/datapage.S b/arch/powerpc/kernel/vdso64/datapage.S index 067247d3efb9..00760dc69d68 100644 --- a/arch/powerpc/kernel/vdso64/datapage.S +++ b/arch/powerpc/kernel/vdso64/datapage.S @@ -13,9 +13,6 @@ #include .text -.global __kernel_datapage_offset; -__kernel_datapage_offset: - .long 0 /* * void *__kernel_get_syscall_map(unsigned int *syscall_count) ; @@ -31,7 +28,7 @@ V_FUNCTION_BEGIN(__kernel_get_syscall_map) mflr r12 .cfi_register lr,r12 mr r4,r3 - get_datapage r3, r0 + get_datapage r3 mtlr r12 addi r3,r3,CFG_SYSCALL_MAP64 cmpldi cr0,r4,0 @@ -53,7 +50,7 @@ V_FUNCTION_BEGIN(__kernel_get_tbfreq) .cfi_startproc mflr r12 .cfi_register lr,r12 - get_datapage r3, r0 + get_datapage r3 ld r3,CFG_TB_TICKS_PER_SEC(r3) mtlr r12 crclr cr0*4+so diff --git a/arch/powerpc/kernel/vdso64/gettimeofday.S b/arch/powerpc/kernel/vdso64/gettimeofday.S index e54c4ce4d356..275f031d0bf1 100644 --- a/arch/powerpc/kernel/vdso64/gettimeofday.S +++ b/arch/powerpc/kernel/vdso64/gettimeofday.S @@ -26,7 +26,7 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday) mr r11,r3 /* r11 holds tv */ mr r10,r4 /* r10 holds tz */ - get_datapage r3, r0 + get_datapage r3 cmpldi r11,0 /* check if tv is NULL */ beq 2f lis r7,1000000@ha /* load up USEC_PER_SEC */ @@ -71,7 +71,7 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime) mflr r12 /* r12 saves lr */ .cfi_register lr,r12 mr r11,r4 /* r11 saves tp */ - get_datapage r3, r0 + get_datapage r3 lis r7,NSEC_PER_SEC@h /* want nanoseconds */ ori r7,r7,NSEC_PER_SEC@l beq cr5,70f @@ -188,7 +188,7 @@ V_FUNCTION_BEGIN(__kernel_clock_getres) mflr r12 .cfi_register lr,r12 - get_datapage r3, r0 + get_datapage r3 lwz r5, CLOCK_HRTIMER_RES(r3) mtlr r12 li r3,0 @@ -221,7 +221,7 @@ V_FUNCTION_BEGIN(__kernel_time) .cfi_register lr,r12 mr r11,r3 /* r11 holds t */ - get_datapage r3, r0 + get_datapage r3 ld r4,STAMP_XTIME_SEC(r3) diff --git a/arch/powerpc/kernel/vdso64/vdso64.lds.S b/arch/powerpc/kernel/vdso64/vdso64.lds.S index 256fb9720298..f58c7e2e9cbd 100644 --- a/arch/powerpc/kernel/vdso64/vdso64.lds.S +++ b/arch/powerpc/kernel/vdso64/vdso64.lds.S @@ -4,6 +4,7 @@ * library */ #include +#include #ifdef __LITTLE_ENDIAN__ OUTPUT_FORMAT("elf64-powerpcle", "elf64-powerpcle", "elf64-powerpcle") @@ -15,6 +16,7 @@ ENTRY(_start) SECTIONS { + PROVIDE(_vdso_datapage = . - PAGE_SIZE); . = VDSO64_LBASE + SIZEOF_HEADERS; .hash : { *(.hash) } :text @@ -138,11 +140,6 @@ VERSION { VDSO_VERSION_STRING { global: - /* - * Has to be there for the kernel to find - */ - __kernel_datapage_offset; - __kernel_get_syscall_map; __kernel_gettimeofday; __kernel_clock_gettime; -- 2.25.0