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Tue, 3 Nov 2020 10:33:33 +0000 (UTC) Message-Id: <20201103095857.375127260@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1604399612; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=JvR9SzXGixMUFPGu3hosRygFCRqGpEvX72/eKoksGms=; b=iCr3QNsuOQxUbcEWlj16M4LpPvo/Y62uSSvcnN+SAO80o4EphxWAK4hfttSL9gOFt6BaES 3gd/Ac+UtveRzMYmdP09SH56/GWn1i//q/WK/GmGvz0+JJjJsL9LQKMg/4U5XeM0UwBLqZ i+8Zp49HYIrlQG3K57otJmBdk39X9yS+dsPqNiRkB3rIYxUpjNv/cUSYSIbMyKdB7EY0rZ ph3bVNQrVGiMwRz6I9crBBsMFvYf7qh/jGpymJtYcPhkMGM5bS7pRLhokf2hu2Po56vCur TZ8sOccczZHm/872N+A7yAzzTuIb3tbrhfzZeuoD9s9c+TFaeiqMMzbSwKy9QQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1604399612; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=JvR9SzXGixMUFPGu3hosRygFCRqGpEvX72/eKoksGms=; b=fd5YAdk1NO85mRvSPB+n0kiHRJ8WGsJ4o9+MEF9URxrh98WvJpvYNTGTbIBoDqeTw83kAi VxNyrAlak1mehDCQ== Date: Tue, 03 Nov 2020 10:27:20 +0100 From: Thomas Gleixner To: LKML Cc: Linus Torvalds , Peter Zijlstra , Paul McKenney , Christoph Hellwig , Sebastian Andrzej Siewior , x86@kernel.org, Andrew Morton , linux-mm@kvack.org, Alexander Viro , Benjamin LaHaise , linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, Chris Mason , Josef Bacik , David Sterba , linux-btrfs@vger.kernel.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, Michal Simek , Thomas Bogendoerfer , linux-mips@vger.kernel.org, Nick Hu , Greentime Hu , Vincent Chen , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , linuxppc-dev@lists.ozlabs.org, "David S. Miller" , sparclinux@vger.kernel.org, Chris Zankel , Max Filippov , linux-xtensa@linux-xtensa.org, Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Christian Koenig , Huang Rui , David Airlie , Daniel Vetter , dri-devel@lists.freedesktop.org, VMware Graphics , Roland Scheidegger , Dave Airlie , Gerd Hoffmann , virtualization@lists.linux-foundation.org, spice-devel@lists.freedesktop.org, Ben Skeggs , nouveau@lists.freedesktop.org, Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , intel-gfx@lists.freedesktop.org Subject: [patch V3 08/37] x86/mm/highmem: Use generic kmap atomic implementation References: <20201103092712.714480842@linutronix.de> MIME-Version: 1.0 Content-transfer-encoding: 8-bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Convert X86 to the generic kmap atomic implementation and make the iomap_atomic() naming convention consistent while at it. Signed-off-by: Thomas Gleixner Cc: x86@kernel.org --- V3: Remove the kmap_types cruft --- arch/x86/Kconfig | 3 + arch/x86/include/asm/fixmap.h | 5 +- arch/x86/include/asm/highmem.h | 13 +++++-- arch/x86/include/asm/iomap.h | 18 +++++----- arch/x86/include/asm/kmap_types.h | 13 ------- arch/x86/include/asm/paravirt_types.h | 1 arch/x86/mm/highmem_32.c | 59 ---------------------------------- arch/x86/mm/init_32.c | 15 -------- arch/x86/mm/iomap_32.c | 59 ++-------------------------------- include/linux/highmem.h | 2 - include/linux/io-mapping.h | 2 - mm/highmem.c | 2 - 12 files changed, 31 insertions(+), 161 deletions(-) --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -14,10 +14,11 @@ config X86_32 select ARCH_WANT_IPC_PARSE_VERSION select CLKSRC_I8253 select CLONE_BACKWARDS + select GENERIC_VDSO_32 select HAVE_DEBUG_STACKOVERFLOW + select KMAP_LOCAL select MODULES_USE_ELF_REL select OLD_SIGACTION - select GENERIC_VDSO_32 config X86_64 def_bool y --- a/arch/x86/include/asm/fixmap.h +++ b/arch/x86/include/asm/fixmap.h @@ -31,7 +31,7 @@ #include #ifdef CONFIG_X86_32 #include -#include +#include #else #include #endif @@ -94,7 +94,7 @@ enum fixed_addresses { #endif #ifdef CONFIG_X86_32 FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ - FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, + FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1, #ifdef CONFIG_PCI_MMCONFIG FIX_PCIE_MCFG, #endif @@ -151,7 +151,6 @@ extern void reserve_top_address(unsigned extern int fixmaps_set; -extern pte_t *kmap_pte; extern pte_t *pkmap_page_table; void __native_set_fixmap(enum fixed_addresses idx, pte_t pte); --- a/arch/x86/include/asm/highmem.h +++ b/arch/x86/include/asm/highmem.h @@ -23,7 +23,6 @@ #include #include -#include #include #include #include @@ -58,11 +57,17 @@ extern unsigned long highstart_pfn, high #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) -void *kmap_atomic_pfn(unsigned long pfn); -void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot); - #define flush_cache_kmaps() do { } while (0) +#define arch_kmap_local_post_map(vaddr, pteval) \ + arch_flush_lazy_mmu_mode() + +#define arch_kmap_local_post_unmap(vaddr) \ + do { \ + flush_tlb_one_kernel((vaddr)); \ + arch_flush_lazy_mmu_mode(); \ + } while (0) + extern void add_highpages_with_active_regions(int nid, unsigned long start_pfn, unsigned long end_pfn); --- a/arch/x86/include/asm/iomap.h +++ b/arch/x86/include/asm/iomap.h @@ -9,19 +9,21 @@ #include #include #include +#include #include #include -void __iomem * -iomap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot); +void __iomem *iomap_atomic_pfn_prot(unsigned long pfn, pgprot_t prot); -void -iounmap_atomic(void __iomem *kvaddr); +static inline void iounmap_atomic(void __iomem *vaddr) +{ + kunmap_local_indexed((void __force *)vaddr); + pagefault_enable(); + preempt_enable(); +} -int -iomap_create_wc(resource_size_t base, unsigned long size, pgprot_t *prot); +int iomap_create_wc(resource_size_t base, unsigned long size, pgprot_t *prot); -void -iomap_free(resource_size_t base, unsigned long size); +void iomap_free(resource_size_t base, unsigned long size); #endif /* _ASM_X86_IOMAP_H */ --- a/arch/x86/include/asm/kmap_types.h +++ /dev/null @@ -1,13 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -#ifndef _ASM_X86_KMAP_TYPES_H -#define _ASM_X86_KMAP_TYPES_H - -#if defined(CONFIG_X86_32) && defined(CONFIG_DEBUG_HIGHMEM) -#define __WITH_KM_FENCE -#endif - -#include - -#undef __WITH_KM_FENCE - -#endif /* _ASM_X86_KMAP_TYPES_H */ --- a/arch/x86/include/asm/paravirt_types.h +++ b/arch/x86/include/asm/paravirt_types.h @@ -41,7 +41,6 @@ #ifndef __ASSEMBLY__ #include -#include #include #include --- a/arch/x86/mm/highmem_32.c +++ b/arch/x86/mm/highmem_32.c @@ -4,65 +4,6 @@ #include /* for totalram_pages */ #include -void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) -{ - unsigned long vaddr; - int idx, type; - - type = kmap_atomic_idx_push(); - idx = type + KM_TYPE_NR*smp_processor_id(); - vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); - BUG_ON(!pte_none(*(kmap_pte-idx))); - set_pte(kmap_pte-idx, mk_pte(page, prot)); - arch_flush_lazy_mmu_mode(); - - return (void *)vaddr; -} -EXPORT_SYMBOL(kmap_atomic_high_prot); - -/* - * This is the same as kmap_atomic() but can map memory that doesn't - * have a struct page associated with it. - */ -void *kmap_atomic_pfn(unsigned long pfn) -{ - return kmap_atomic_prot_pfn(pfn, kmap_prot); -} -EXPORT_SYMBOL_GPL(kmap_atomic_pfn); - -void kunmap_atomic_high(void *kvaddr) -{ - unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; - - if (vaddr >= __fix_to_virt(FIX_KMAP_END) && - vaddr <= __fix_to_virt(FIX_KMAP_BEGIN)) { - int idx, type; - - type = kmap_atomic_idx(); - idx = type + KM_TYPE_NR * smp_processor_id(); - -#ifdef CONFIG_DEBUG_HIGHMEM - WARN_ON_ONCE(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx)); -#endif - /* - * Force other mappings to Oops if they'll try to access this - * pte without first remap it. Keeping stale mappings around - * is a bad idea also, in case the page changes cacheability - * attributes or becomes a protected page in a hypervisor. - */ - kpte_clear_flush(kmap_pte-idx, vaddr); - kmap_atomic_idx_pop(); - arch_flush_lazy_mmu_mode(); - } -#ifdef CONFIG_DEBUG_HIGHMEM - else { - BUG_ON(vaddr < PAGE_OFFSET); - BUG_ON(vaddr >= (unsigned long)high_memory); - } -#endif -} -EXPORT_SYMBOL(kunmap_atomic_high); - void __init set_highmem_pages_init(void) { struct zone *zone; --- a/arch/x86/mm/init_32.c +++ b/arch/x86/mm/init_32.c @@ -394,19 +394,6 @@ kernel_physical_mapping_init(unsigned lo return last_map_addr; } -pte_t *kmap_pte; - -static void __init kmap_init(void) -{ - unsigned long kmap_vstart; - - /* - * Cache the first kmap pte: - */ - kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); - kmap_pte = virt_to_kpte(kmap_vstart); -} - #ifdef CONFIG_HIGHMEM static void __init permanent_kmaps_init(pgd_t *pgd_base) { @@ -712,8 +699,6 @@ void __init paging_init(void) __flush_tlb_all(); - kmap_init(); - /* * NOTE: at this point the bootmem allocator is fully available. */ --- a/arch/x86/mm/iomap_32.c +++ b/arch/x86/mm/iomap_32.c @@ -44,28 +44,7 @@ void iomap_free(resource_size_t base, un } EXPORT_SYMBOL_GPL(iomap_free); -void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot) -{ - unsigned long vaddr; - int idx, type; - - preempt_disable(); - pagefault_disable(); - - type = kmap_atomic_idx_push(); - idx = type + KM_TYPE_NR * smp_processor_id(); - vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); - set_pte(kmap_pte - idx, pfn_pte(pfn, prot)); - arch_flush_lazy_mmu_mode(); - - return (void *)vaddr; -} - -/* - * Map 'pfn' using protections 'prot' - */ -void __iomem * -iomap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot) +void __iomem *iomap_atomic_pfn_prot(unsigned long pfn, pgprot_t prot) { /* * For non-PAT systems, translate non-WB request to UC- just in @@ -81,36 +60,8 @@ iomap_atomic_prot_pfn(unsigned long pfn, /* Filter out unsupported __PAGE_KERNEL* bits: */ pgprot_val(prot) &= __default_kernel_pte_mask; - return (void __force __iomem *) kmap_atomic_prot_pfn(pfn, prot); -} -EXPORT_SYMBOL_GPL(iomap_atomic_prot_pfn); - -void -iounmap_atomic(void __iomem *kvaddr) -{ - unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; - - if (vaddr >= __fix_to_virt(FIX_KMAP_END) && - vaddr <= __fix_to_virt(FIX_KMAP_BEGIN)) { - int idx, type; - - type = kmap_atomic_idx(); - idx = type + KM_TYPE_NR * smp_processor_id(); - -#ifdef CONFIG_DEBUG_HIGHMEM - WARN_ON_ONCE(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx)); -#endif - /* - * Force other mappings to Oops if they'll try to access this - * pte without first remap it. Keeping stale mappings around - * is a bad idea also, in case the page changes cacheability - * attributes or becomes a protected page in a hypervisor. - */ - kpte_clear_flush(kmap_pte-idx, vaddr); - kmap_atomic_idx_pop(); - } - - pagefault_enable(); - preempt_enable(); + preempt_disable(); + pagefault_disable(); + return (void __force __iomem *)__kmap_local_pfn_prot(pfn, prot); } -EXPORT_SYMBOL_GPL(iounmap_atomic); +EXPORT_SYMBOL_GPL(iomap_atomic_pfn_prot); --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -217,7 +217,7 @@ static inline void __kunmap_atomic(void #endif /* CONFIG_HIGHMEM */ #if !defined(CONFIG_KMAP_LOCAL) -#if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32) +#if defined(CONFIG_HIGHMEM) DECLARE_PER_CPU(int, __kmap_atomic_idx); --- a/include/linux/io-mapping.h +++ b/include/linux/io-mapping.h @@ -69,7 +69,7 @@ io_mapping_map_atomic_wc(struct io_mappi BUG_ON(offset >= mapping->size); phys_addr = mapping->base + offset; - return iomap_atomic_prot_pfn(PHYS_PFN(phys_addr), mapping->prot); + return iomap_atomic_pfn_prot(PHYS_PFN(phys_addr), mapping->prot); } static inline void --- a/mm/highmem.c +++ b/mm/highmem.c @@ -32,7 +32,7 @@ #include #ifndef CONFIG_KMAP_LOCAL -#if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32) +#ifdef CONFIG_HIGHMEM DEFINE_PER_CPU(int, __kmap_atomic_idx); #endif #endif