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bh=KaNIP+gHbCxEiFjMUXsw2ll/YULzf8E240MXoq9IavQ=; b=02FwbJXl3OAIrXjRtBQ0DicQZ2DyF6HHvJuRKCFGyMrTUHOwJHXKipX4ubGORyuMMUanCP 7rAr7hNu3+xpCHBw== Date: Thu, 29 Oct 2020 23:18:07 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Andrew Morton , linux-mm@kvack.org, x86@kernel.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Guo Ren , 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 Subject: [patch V2 01/18] sched: Make migrate_disable/enable() independent of RT References: <20201029221806.189523375@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: Now that the scheduler can deal with migrate disable properly, there is no real compelling reason to make it only available for RT. There are quite some code pathes which needlessly disable preemption in order to prevent migration and some constructs like kmap_atomic() enforce it implicitly. Making it available independent of RT allows to provide a preemptible variant of kmap_atomic() and makes the code more consistent in general. FIXME: Rework the comment in preempt.h Signed-off-by: Thomas Gleixner Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Juri Lelli Cc: Vincent Guittot Cc: Dietmar Eggemann Cc: Steven Rostedt Cc: Ben Segall Cc: Mel Gorman Cc: Daniel Bristot de Oliveira --- include/linux/preempt.h | 38 +++----------------------------------- include/linux/sched.h | 2 +- kernel/sched/core.c | 12 ++---------- kernel/sched/sched.h | 2 +- lib/smp_processor_id.c | 2 +- 5 files changed, 8 insertions(+), 48 deletions(-) --- a/include/linux/preempt.h +++ b/include/linux/preempt.h @@ -322,7 +322,7 @@ static inline void preempt_notifier_init #endif -#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT) +#ifdef CONFIG_SMP /* * Migrate-Disable and why it is undesired. @@ -382,43 +382,11 @@ static inline void preempt_notifier_init extern void migrate_disable(void); extern void migrate_enable(void); -#elif defined(CONFIG_PREEMPT_RT) +#else static inline void migrate_disable(void) { } static inline void migrate_enable(void) { } -#else /* !CONFIG_PREEMPT_RT */ - -/** - * migrate_disable - Prevent migration of the current task - * - * Maps to preempt_disable() which also disables preemption. Use - * migrate_disable() to annotate that the intent is to prevent migration, - * but not necessarily preemption. - * - * Can be invoked nested like preempt_disable() and needs the corresponding - * number of migrate_enable() invocations. - */ -static __always_inline void migrate_disable(void) -{ - preempt_disable(); -} - -/** - * migrate_enable - Allow migration of the current task - * - * Counterpart to migrate_disable(). - * - * As migrate_disable() can be invoked nested, only the outermost invocation - * reenables migration. - * - * Currently mapped to preempt_enable(). - */ -static __always_inline void migrate_enable(void) -{ - preempt_enable(); -} - -#endif /* CONFIG_SMP && CONFIG_PREEMPT_RT */ +#endif /* CONFIG_SMP */ #endif /* __LINUX_PREEMPT_H */ --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -715,7 +715,7 @@ struct task_struct { const cpumask_t *cpus_ptr; cpumask_t cpus_mask; void *migration_pending; -#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT) +#ifdef CONFIG_SMP unsigned short migration_disabled; #endif unsigned short migration_flags; --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1696,8 +1696,6 @@ void check_preempt_curr(struct rq *rq, s #ifdef CONFIG_SMP -#ifdef CONFIG_PREEMPT_RT - static void __do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask, u32 flags); @@ -1772,8 +1770,6 @@ static inline bool rq_has_pinned_tasks(s return rq->nr_pinned; } -#endif - /* * Per-CPU kthreads are allowed to run on !active && online CPUs, see * __set_cpus_allowed_ptr() and select_fallback_rq(). @@ -2841,7 +2837,7 @@ void sched_set_stop_task(int cpu, struct } } -#else +#else /* CONFIG_SMP */ static inline int __set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask, @@ -2850,10 +2846,6 @@ static inline int __set_cpus_allowed_ptr return set_cpus_allowed_ptr(p, new_mask); } -#endif /* CONFIG_SMP */ - -#if !defined(CONFIG_SMP) || !defined(CONFIG_PREEMPT_RT) - static inline void migrate_disable_switch(struct rq *rq, struct task_struct *p) { } static inline bool rq_has_pinned_tasks(struct rq *rq) @@ -2861,7 +2853,7 @@ static inline bool rq_has_pinned_tasks(s return false; } -#endif +#endif /* !CONFIG_SMP */ static void ttwu_stat(struct task_struct *p, int cpu, int wake_flags) --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1056,7 +1056,7 @@ struct rq { struct cpuidle_state *idle_state; #endif -#if defined(CONFIG_PREEMPT_RT) && defined(CONFIG_SMP) +#if CONFIG_SMP unsigned int nr_pinned; #endif unsigned int push_busy; --- a/lib/smp_processor_id.c +++ b/lib/smp_processor_id.c @@ -26,7 +26,7 @@ unsigned int check_preemption_disabled(c if (current->nr_cpus_allowed == 1) goto out; -#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT) +#ifdef CONFIG_SMP if (current->migration_disabled) goto out; #endif From patchwork Thu Oct 29 22:18:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11867739 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7EDAD697 for ; 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bh=i3kbbtl9EePeHW2/ft3bZDh5NUwHcPcZYxbBfPjNZc8=; b=ikYVZ3/OGryHATIjRKeS4Pl9IRgd7+Kxln3CLC0H+27o+MISKcURCaVHypwpCJqENmDA3M iVSn7wd07o6DX9Bw== Date: Thu, 29 Oct 2020 23:18:08 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , Andrew Morton , linux-mm@kvack.org, Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , x86@kernel.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Guo Ren , 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 Subject: [patch V2 02/18] mm/highmem: Un-EXPORT __kmap_atomic_idx() References: <20201029221806.189523375@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: Nothing in modules can use that. Signed-off-by: Thomas Gleixner Reviewed-by: Christoph Hellwig Cc: Andrew Morton Cc: linux-mm@kvack.org --- mm/highmem.c | 2 -- 1 file changed, 2 deletions(-) --- a/mm/highmem.c +++ b/mm/highmem.c @@ -108,8 +108,6 @@ static inline wait_queue_head_t *get_pkm atomic_long_t _totalhigh_pages __read_mostly; EXPORT_SYMBOL(_totalhigh_pages); -EXPORT_PER_CPU_SYMBOL(__kmap_atomic_idx); - unsigned int nr_free_highpages (void) { struct zone *zone; From patchwork Thu Oct 29 22:18:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11867741 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 15F2C1130 for ; Thu, 29 Oct 2020 22:32:21 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 95EA2206DD for ; Thu, 29 Oct 2020 22:32:20 +0000 (UTC) Authentication-Results: mail.kernel.org; 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bh=0XIt0OG9v8n7AQWOk83zwx5cp0WK011IAZjG+scyfH4=; b=ZieSIkPqQ9T6Zn/Y+kRu7RVGaPV5thY3g3ejT/d6bLIns9xrZbjcZ7j4HxTIAoRF4tEwVz xc/ieNRL3cMbBFBA== Date: Thu, 29 Oct 2020 23:18:09 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , Andrew Morton , linux-mm@kvack.org, Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , x86@kernel.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Guo Ren , 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 Subject: [patch V2 03/18] highmem: Provide generic variant of kmap_atomic* References: <20201029221806.189523375@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: The kmap_atomic* interfaces in all architectures are pretty much the same except for post map operations (flush) and pre- and post unmap operations. Provide a generic variant for that. Signed-off-by: Thomas Gleixner Cc: Andrew Morton Cc: linux-mm@kvack.org --- V2: Address review comments from Christoph (style and EXPORT variant) --- include/linux/highmem.h | 79 ++++++++++++++++++++++++++------ mm/Kconfig | 3 + mm/highmem.c | 118 +++++++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 183 insertions(+), 17 deletions(-) --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -31,9 +31,16 @@ static inline void invalidate_kernel_vma #include +/* + * Outside of CONFIG_HIGHMEM to support X86 32bit iomap_atomic() cruft. + */ +#ifdef CONFIG_KMAP_LOCAL +void *__kmap_local_pfn_prot(unsigned long pfn, pgprot_t prot); +void *__kmap_local_page_prot(struct page *page, pgprot_t prot); +void kunmap_local_indexed(void *vaddr); +#endif + #ifdef CONFIG_HIGHMEM -extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); -extern void kunmap_atomic_high(void *kvaddr); #include #ifndef ARCH_HAS_KMAP_FLUSH_TLB @@ -81,6 +88,11 @@ static inline void kunmap(struct page *p * be used in IRQ contexts, so in some (very limited) cases we need * it. */ + +#ifndef CONFIG_KMAP_LOCAL +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); +void kunmap_atomic_high(void *kvaddr); + static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot) { preempt_disable(); @@ -89,7 +101,38 @@ static inline void *kmap_atomic_prot(str return page_address(page); return kmap_atomic_high_prot(page, prot); } -#define kmap_atomic(page) kmap_atomic_prot(page, kmap_prot) + +static inline void __kunmap_atomic(void *vaddr) +{ + kunmap_atomic_high(vaddr); +} +#else /* !CONFIG_KMAP_LOCAL */ + +static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot) +{ + preempt_disable(); + pagefault_disable(); + return __kmap_local_page_prot(page, prot); +} + +static inline void *kmap_atomic_pfn(unsigned long pfn) +{ + preempt_disable(); + pagefault_disable(); + return __kmap_local_pfn_prot(pfn, kmap_prot); +} + +static inline void __kunmap_atomic(void *addr) +{ + kunmap_local_indexed(addr); +} + +#endif /* CONFIG_KMAP_LOCAL */ + +static inline void *kmap_atomic(struct page *page) +{ + return kmap_atomic_prot(page, kmap_prot); +} /* declarations for linux/mm/highmem.c */ unsigned int nr_free_highpages(void); @@ -157,21 +200,28 @@ static inline void *kmap_atomic(struct p pagefault_disable(); return page_address(page); } -#define kmap_atomic_prot(page, prot) kmap_atomic(page) -static inline void kunmap_atomic_high(void *addr) +static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot) +{ + return kmap_atomic(page); +} + +static inline void *kmap_atomic_pfn(unsigned long pfn) +{ + return kmap_atomic(pfn_to_page(pfn)); +} + +static inline void __kunmap_atomic(void *addr) { /* * Mostly nothing to do in the CONFIG_HIGHMEM=n case as kunmap_atomic() - * handles re-enabling faults + preemption + * handles re-enabling faults and preemption */ #ifdef ARCH_HAS_FLUSH_ON_KUNMAP kunmap_flush_on_unmap(addr); #endif } -#define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn)) - #define kmap_flush_unused() do {} while(0) #endif /* CONFIG_HIGHMEM */ @@ -213,15 +263,14 @@ static inline void kmap_atomic_idx_pop(v * Prevent people trying to call kunmap_atomic() as if it were kunmap() * kunmap_atomic() should get the return value of kmap_atomic, not the page. */ -#define kunmap_atomic(addr) \ -do { \ - BUILD_BUG_ON(__same_type((addr), struct page *)); \ - kunmap_atomic_high(addr); \ - pagefault_enable(); \ - preempt_enable(); \ +#define kunmap_atomic(__addr) \ +do { \ + BUILD_BUG_ON(__same_type((__addr), struct page *)); \ + __kunmap_atomic(__addr); \ + pagefault_enable(); \ + preempt_enable(); \ } while (0) - /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ #ifndef clear_user_highpage static inline void clear_user_highpage(struct page *page, unsigned long vaddr) --- a/mm/Kconfig +++ b/mm/Kconfig @@ -872,4 +872,7 @@ config ARCH_HAS_HUGEPD config MAPPING_DIRTY_HELPERS bool +config KMAP_LOCAL + bool + endmenu --- a/mm/highmem.c +++ b/mm/highmem.c @@ -30,6 +30,7 @@ #include #include #include +#include #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32) DEFINE_PER_CPU(int, __kmap_atomic_idx); @@ -365,9 +366,122 @@ void kunmap_high(struct page *page) if (need_wakeup) wake_up(pkmap_map_wait); } - EXPORT_SYMBOL(kunmap_high); -#endif /* CONFIG_HIGHMEM */ +#endif /* CONFIG_HIGHMEM */ + +#ifdef CONFIG_KMAP_LOCAL +#ifndef arch_kmap_local_post_map +# define arch_kmap_local_post_map(vaddr, pteval) do { } while (0) +#endif + +#ifndef arch_kmap_local_pre_unmap +# define arch_kmap_local_pre_unmap(vaddr) do { } while (0) +#endif + +#ifndef arch_kmap_local_post_unmap +# define arch_kmap_local_post_unmap(vaddr) do { } while (0) +#endif + +#ifndef arch_kmap_local_map_idx +#define arch_kmap_local_map_idx(type, pfn) kmap_local_calc_idx(type) +#endif + +#ifndef arch_kmap_local_unmap_idx +#define arch_kmap_local_unmap_idx(type, vaddr) kmap_local_calc_idx(type) +#endif + +#ifndef arch_kmap_local_high_get +static inline void *arch_kmap_local_high_get(struct page *page) +{ + return NULL; +} +#endif + +/* Unmap a local mapping which was obtained by kmap_high_get() */ +static inline void kmap_high_unmap_local(unsigned long vaddr) +{ +#ifdef ARCH_NEEDS_KMAP_HIGH_GET + if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) + kunmap_high(pte_page(pkmap_page_table[PKMAP_NR(vaddr)])); +#endif +} + +static inline int kmap_local_calc_idx(int type) +{ + return type + KM_TYPE_NR * smp_processor_id(); +} + +static pte_t *__kmap_pte; + +static pte_t *kmap_get_pte(void) +{ + if (!__kmap_pte) + __kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); + return __kmap_pte; +} + +void *__kmap_local_pfn_prot(unsigned long pfn, pgprot_t prot) +{ + pte_t pteval, *kmap_pte = kmap_get_pte(); + unsigned long vaddr; + int idx; + + preempt_disable(); + idx = arch_kmap_local_map_idx(kmap_atomic_idx_push(), pfn); + vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); + BUG_ON(!pte_none(*(kmap_pte - idx))); + pteval = pfn_pte(pfn, prot); + set_pte_at(&init_mm, vaddr, kmap_pte - idx, pteval); + arch_kmap_local_post_map(vaddr, pteval); + preempt_enable(); + + return (void *)vaddr; +} +EXPORT_SYMBOL_GPL(__kmap_local_pfn_prot); + +void *__kmap_local_page_prot(struct page *page, pgprot_t prot) +{ + void *kmap; + + if (!PageHighMem(page)) + return page_address(page); + + /* Try kmap_high_get() if architecture has it enabled */ + kmap = arch_kmap_local_high_get(page); + if (kmap) + return kmap; + + return __kmap_local_pfn_prot(page_to_pfn(page), prot); +} +EXPORT_SYMBOL(__kmap_local_page_prot); + +void kunmap_local_indexed(void *vaddr) +{ + unsigned long addr = (unsigned long) vaddr & PAGE_MASK; + pte_t *kmap_pte = kmap_get_pte(); + int idx; + + if (addr < __fix_to_virt(FIX_KMAP_END) || + addr > __fix_to_virt(FIX_KMAP_BEGIN)) { + WARN_ON_ONCE(addr < PAGE_OFFSET); + + /* Handle mappings which were obtained by kmap_high_get() */ + kmap_high_unmap_local(addr); + return; + } + + preempt_disable(); + idx = arch_kmap_local_unmap_idx(kmap_atomic_idx(), addr); + WARN_ON_ONCE(addr != __fix_to_virt(FIX_KMAP_BEGIN + idx)); + + arch_kmap_local_pre_unmap(addr); + pte_clear(&init_mm, addr, kmap_pte - idx); + arch_kmap_local_post_unmap(addr); + kmap_atomic_idx_pop(); + preempt_enable(); +} +EXPORT_SYMBOL(kunmap_local_indexed); +#endif #if defined(HASHED_PAGE_VIRTUAL) From patchwork Thu Oct 29 22:18:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11867743 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7473F1130 for ; Thu, 29 Oct 2020 22:32:23 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 091F020838 for ; Thu, 29 Oct 2020 22:32:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="d5x1VtEr"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="B0bLlLwU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 091F020838 Authentication-Results: mail.kernel.org; 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bh=YUFkSS0SmKHrjVK9j7zp61zNdE1EMunOZsr2rqRATRM=; b=B0bLlLwUxJvxzt9I7LtpElLoJDN40JibSmVNy5zRJDRt4enTzB8YsoT8EKdo1hSNxxxW6c 0fXPrqIrLb/i8TAg== Date: Thu, 29 Oct 2020 23:18:10 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , x86@kernel.org, Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Andrew Morton , linux-mm@kvack.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Guo Ren , 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 Subject: [patch V2 04/18] x86/mm/highmem: Use generic kmap atomic implementation References: <20201029221806.189523375@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 --- arch/x86/Kconfig | 3 +- arch/x86/include/asm/fixmap.h | 1 arch/x86/include/asm/highmem.h | 12 ++++++-- arch/x86/include/asm/iomap.h | 18 ++++++------ arch/x86/mm/highmem_32.c | 59 ----------------------------------------- arch/x86/mm/init_32.c | 15 ---------- arch/x86/mm/iomap_32.c | 59 +++-------------------------------------- include/linux/io-mapping.h | 2 - 8 files changed, 27 insertions(+), 142 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 @@ -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 @@ -58,11 +58,17 @@ 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/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/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 From patchwork Thu Oct 29 22:18:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11867745 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7B662697 for ; 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bh=HnSZZISzS7YHLaWjNBqhnVwkOJGM4uyuebNYkt2dD2Y=; b=qUGB4G8IMxu0ZLQ5PIWAx7dEhQA3Wqk8RSi0QcDYGAfZeQ9hWjcWmOwz2v0X9xiOhpcQcf yyUJ7Fi+2PVluoCw== Date: Thu, 29 Oct 2020 23:18:11 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , Vineet Gupta , linux-snps-arc@lists.infradead.org, Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Andrew Morton , linux-mm@kvack.org, x86@kernel.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Guo Ren , 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 Subject: [patch V2 05/18] arc/mm/highmem: Use generic kmap atomic implementation References: <20201029221806.189523375@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: Adopt the map ordering to match the other architectures and the generic code. Signed-off-by: Thomas Gleixner Cc: Vineet Gupta Cc: linux-snps-arc@lists.infradead.org --- arch/arc/Kconfig | 1 arch/arc/include/asm/highmem.h | 8 ++++++- arch/arc/mm/highmem.c | 44 ----------------------------------------- 3 files changed, 9 insertions(+), 44 deletions(-) --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -507,6 +507,7 @@ config LINUX_RAM_BASE config HIGHMEM bool "High Memory Support" select ARCH_DISCONTIGMEM_ENABLE + select KMAP_LOCAL help With ARC 2G:2G address split, only upper 2G is directly addressable by kernel. Enable this to potentially allow access to rest of 2G and PAE --- a/arch/arc/include/asm/highmem.h +++ b/arch/arc/include/asm/highmem.h @@ -15,7 +15,10 @@ #define FIXMAP_BASE (PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE) #define FIXMAP_SIZE PGDIR_SIZE /* only 1 PGD worth */ #define KM_TYPE_NR ((FIXMAP_SIZE >> PAGE_SHIFT)/NR_CPUS) -#define FIXMAP_ADDR(nr) (FIXMAP_BASE + ((nr) << PAGE_SHIFT)) + +#define FIX_KMAP_BEGIN (0) +#define FIX_KMAP_END ((FIXMAP_SIZE >> PAGE_SHIFT) - 1) +#define FIXADDR_TOP (FIXMAP_BASE + FIXMAP_SIZE - PAGE_SIZE) /* start after fixmap area */ #define PKMAP_BASE (FIXMAP_BASE + FIXMAP_SIZE) @@ -29,6 +32,9 @@ extern void kmap_init(void); +#define arch_kmap_local_post_unmap(vaddr) \ + local_flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE) + static inline void flush_cache_kmaps(void) { flush_cache_all(); --- a/arch/arc/mm/highmem.c +++ b/arch/arc/mm/highmem.c @@ -47,48 +47,6 @@ */ extern pte_t * pkmap_page_table; -static pte_t * fixmap_page_table; - -void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) -{ - int idx, cpu_idx; - unsigned long vaddr; - - cpu_idx = kmap_atomic_idx_push(); - idx = cpu_idx + KM_TYPE_NR * smp_processor_id(); - vaddr = FIXMAP_ADDR(idx); - - set_pte_at(&init_mm, vaddr, fixmap_page_table + idx, - mk_pte(page, prot)); - - return (void *)vaddr; -} -EXPORT_SYMBOL(kmap_atomic_high_prot); - -void kunmap_atomic_high(void *kv) -{ - unsigned long kvaddr = (unsigned long)kv; - - if (kvaddr >= FIXMAP_BASE && kvaddr < (FIXMAP_BASE + FIXMAP_SIZE)) { - - /* - * Because preemption is disabled, this vaddr can be associated - * with the current allocated index. - * But in case of multiple live kmap_atomic(), it still relies on - * callers to unmap in right order. - */ - int cpu_idx = kmap_atomic_idx(); - int idx = cpu_idx + KM_TYPE_NR * smp_processor_id(); - - WARN_ON(kvaddr != FIXMAP_ADDR(idx)); - - pte_clear(&init_mm, kvaddr, fixmap_page_table + idx); - local_flush_tlb_kernel_range(kvaddr, kvaddr + PAGE_SIZE); - - kmap_atomic_idx_pop(); - } -} -EXPORT_SYMBOL(kunmap_atomic_high); static noinline pte_t * __init alloc_kmap_pgtable(unsigned long kvaddr) { @@ -113,5 +71,5 @@ void __init kmap_init(void) pkmap_page_table = alloc_kmap_pgtable(PKMAP_BASE); BUILD_BUG_ON(LAST_PKMAP > PTRS_PER_PTE); - fixmap_page_table = alloc_kmap_pgtable(FIXMAP_BASE); + alloc_kmap_pgtable(FIXMAP_BASE); } From patchwork Thu Oct 29 22:18:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11867747 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B6456697 for ; Thu, 29 Oct 2020 22:32:27 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 51BF621D7B for ; Thu, 29 Oct 2020 22:32:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="kOvuaaNw"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="Tr9cMrwm" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 51BF621D7B Authentication-Results: mail.kernel.org; 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bh=4pbqy1oxZ7hvzU+YxFccKSj2wRStaHISaAIgYIlWHiI=; b=Tr9cMrwmQY+N7XZ4sDkllnAvgljBj3LpnEhFBPG9eUzLPeNLXrgyj96daU3efsOYcRQd/H KIt/tm1Cm2vuIsCQ== Date: Thu, 29 Oct 2020 23:18:12 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Andrew Morton , linux-mm@kvack.org, x86@kernel.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Guo Ren , 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 Subject: [patch V2 06/18] ARM: highmem: Switch to generic kmap atomic References: <20201029221806.189523375@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: No reason having the same code in every architecture. Signed-off-by: Thomas Gleixner Cc: Russell King Cc: Arnd Bergmann Cc: linux-arm-kernel@lists.infradead.org diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index e00d94b16658..410235e350cc 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1499,6 +1499,7 @@ config HAVE_ARCH_PFN_VALID config HIGHMEM bool "High Memory Support" depends on MMU + select KMAP_LOCAL help The address space of ARM processors is only 4 Gigabytes large and it has to accommodate user address space, kernel address diff --git a/arch/arm/include/asm/highmem.h b/arch/arm/include/asm/highmem.h index 31811be38d78..99a99862c474 100644 --- a/arch/arm/include/asm/highmem.h +++ b/arch/arm/include/asm/highmem.h @@ -46,19 +46,32 @@ extern pte_t *pkmap_page_table; #ifdef ARCH_NEEDS_KMAP_HIGH_GET extern void *kmap_high_get(struct page *page); -#else + +static inline void *arch_kmap_local_high_get(struct page *page) +{ + if (IS_ENABLED(CONFIG_DEBUG_HIGHMEM) && !cache_is_vivt()) + return NULL; + return kmap_high_get(page); +} +#define arch_kmap_local_high_get arch_kmap_local_high_get + +#else /* ARCH_NEEDS_KMAP_HIGH_GET */ static inline void *kmap_high_get(struct page *page) { return NULL; } -#endif +#endif /* !ARCH_NEEDS_KMAP_HIGH_GET */ -/* - * The following functions are already defined by - * when CONFIG_HIGHMEM is not set. - */ -#ifdef CONFIG_HIGHMEM -extern void *kmap_atomic_pfn(unsigned long pfn); -#endif +#define arch_kmap_local_post_map(vaddr, pteval) \ + local_flush_tlb_kernel_page(vaddr) + +#define arch_kmap_local_pre_unmap(vaddr) \ +do { \ + if (cache_is_vivt()) \ + __cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE); \ +} while (0) + +#define arch_kmap_local_post_unmap(vaddr) \ + local_flush_tlb_kernel_page(vaddr) #endif diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile index 7cb1699fbfc4..c4ce477c5261 100644 --- a/arch/arm/mm/Makefile +++ b/arch/arm/mm/Makefile @@ -19,7 +19,6 @@ obj-$(CONFIG_MODULES) += proc-syms.o obj-$(CONFIG_DEBUG_VIRTUAL) += physaddr.o obj-$(CONFIG_ALIGNMENT_TRAP) += alignment.o -obj-$(CONFIG_HIGHMEM) += highmem.o obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o obj-$(CONFIG_ARM_PV_FIXUP) += pv-fixup-asm.o diff --git a/arch/arm/mm/highmem.c b/arch/arm/mm/highmem.c deleted file mode 100644 index 187fab227b50..000000000000 --- a/arch/arm/mm/highmem.c +++ /dev/null @@ -1,121 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * arch/arm/mm/highmem.c -- ARM highmem support - * - * Author: Nicolas Pitre - * Created: september 8, 2008 - * Copyright: Marvell Semiconductors Inc. - */ - -#include -#include -#include -#include -#include -#include -#include "mm.h" - -static inline void set_fixmap_pte(int idx, pte_t pte) -{ - unsigned long vaddr = __fix_to_virt(idx); - pte_t *ptep = virt_to_kpte(vaddr); - - set_pte_ext(ptep, pte, 0); - local_flush_tlb_kernel_page(vaddr); -} - -static inline pte_t get_fixmap_pte(unsigned long vaddr) -{ - pte_t *ptep = virt_to_kpte(vaddr); - - return *ptep; -} - -void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) -{ - unsigned int idx; - unsigned long vaddr; - void *kmap; - int type; - -#ifdef CONFIG_DEBUG_HIGHMEM - /* - * There is no cache coherency issue when non VIVT, so force the - * dedicated kmap usage for better debugging purposes in that case. - */ - if (!cache_is_vivt()) - kmap = NULL; - else -#endif - kmap = kmap_high_get(page); - if (kmap) - return kmap; - - type = kmap_atomic_idx_push(); - - idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id(); - vaddr = __fix_to_virt(idx); -#ifdef CONFIG_DEBUG_HIGHMEM - /* - * With debugging enabled, kunmap_atomic forces that entry to 0. - * Make sure it was indeed properly unmapped. - */ - BUG_ON(!pte_none(get_fixmap_pte(vaddr))); -#endif - /* - * When debugging is off, kunmap_atomic leaves the previous mapping - * in place, so the contained TLB flush ensures the TLB is updated - * with the new mapping. - */ - set_fixmap_pte(idx, mk_pte(page, prot)); - - return (void *)vaddr; -} -EXPORT_SYMBOL(kmap_atomic_high_prot); - -void kunmap_atomic_high(void *kvaddr) -{ - unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; - int idx, type; - - if (kvaddr >= (void *)FIXADDR_START) { - type = kmap_atomic_idx(); - idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id(); - - if (cache_is_vivt()) - __cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE); -#ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(vaddr != __fix_to_virt(idx)); - set_fixmap_pte(idx, __pte(0)); -#else - (void) idx; /* to kill a warning */ -#endif - kmap_atomic_idx_pop(); - } else if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) { - /* this address was obtained through kmap_high_get() */ - kunmap_high(pte_page(pkmap_page_table[PKMAP_NR(vaddr)])); - } -} -EXPORT_SYMBOL(kunmap_atomic_high); - -void *kmap_atomic_pfn(unsigned long pfn) -{ - unsigned long vaddr; - int idx, type; - struct page *page = pfn_to_page(pfn); - - preempt_disable(); - pagefault_disable(); - if (!PageHighMem(page)) - return page_address(page); - - type = kmap_atomic_idx_push(); - idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id(); - vaddr = __fix_to_virt(idx); -#ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(!pte_none(get_fixmap_pte(vaddr))); -#endif - set_fixmap_pte(idx, pfn_pte(pfn, kmap_prot)); - - return (void *)vaddr; -} From patchwork Thu Oct 29 22:18:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11867749 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E6AD21130 for ; Thu, 29 Oct 2020 22:32:29 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 92E2B20FC3 for ; Thu, 29 Oct 2020 22:32:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="PSYrK+qu"; 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bh=+xC87ERpPXGgavrN8jcZui16Ib//VJ4ULsWIMrAKkyk=; b=nwqkiNxkBvtPCgsAOkT1FX75guvPll1ni4sFisLZr1EA+lxBsQzL7jqFmAMBFTq9rE/ElC EmvA/M+1jBoKioCw== Date: Thu, 29 Oct 2020 23:18:13 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , Guo Ren , linux-csky@vger.kernel.org, Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Andrew Morton , linux-mm@kvack.org, x86@kernel.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.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 Subject: [patch V2 07/18] csky/mm/highmem: Switch to generic kmap atomic References: <20201029221806.189523375@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: No reason having the same code in every architecture. Signed-off-by: Thomas Gleixner Acked-by: Guo Ren Cc: linux-csky@vger.kernel.org --- arch/csky/Kconfig | 1 arch/csky/include/asm/highmem.h | 4 +- arch/csky/mm/highmem.c | 75 ---------------------------------------- 3 files changed, 5 insertions(+), 75 deletions(-) --- a/arch/csky/Kconfig +++ b/arch/csky/Kconfig @@ -286,6 +286,7 @@ config NR_CPUS config HIGHMEM bool "High Memory Support" depends on !CPU_CK610 + select KMAP_LOCAL default y config FORCE_MAX_ZONEORDER --- a/arch/csky/include/asm/highmem.h +++ b/arch/csky/include/asm/highmem.h @@ -32,10 +32,12 @@ extern pte_t *pkmap_page_table; #define ARCH_HAS_KMAP_FLUSH_TLB extern void kmap_flush_tlb(unsigned long addr); -extern void *kmap_atomic_pfn(unsigned long pfn); #define flush_cache_kmaps() do {} while (0) +#define arch_kmap_local_post_map(vaddr, pteval) kmap_flush_tlb(vaddr) +#define arch_kmap_local_post_unmap(vaddr) kmap_flush_tlb(vaddr) + extern void kmap_init(void); #endif /* __KERNEL__ */ --- a/arch/csky/mm/highmem.c +++ b/arch/csky/mm/highmem.c @@ -9,8 +9,6 @@ #include #include -static pte_t *kmap_pte; - unsigned long highstart_pfn, highend_pfn; void kmap_flush_tlb(unsigned long addr) @@ -19,67 +17,7 @@ void kmap_flush_tlb(unsigned long addr) } EXPORT_SYMBOL(kmap_flush_tlb); -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); -#ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(!pte_none(*(kmap_pte - idx))); -#endif - set_pte(kmap_pte-idx, mk_pte(page, prot)); - flush_tlb_one((unsigned long)vaddr); - - return (void *)vaddr; -} -EXPORT_SYMBOL(kmap_atomic_high_prot); - -void kunmap_atomic_high(void *kvaddr) -{ - unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; - int idx; - - if (vaddr < FIXADDR_START) - return; - -#ifdef CONFIG_DEBUG_HIGHMEM - idx = KM_TYPE_NR*smp_processor_id() + kmap_atomic_idx(); - - BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx)); - - pte_clear(&init_mm, vaddr, kmap_pte - idx); - flush_tlb_one(vaddr); -#else - (void) idx; /* to kill a warning */ -#endif - kmap_atomic_idx_pop(); -} -EXPORT_SYMBOL(kunmap_atomic_high); - -/* - * 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) -{ - unsigned long vaddr; - int idx, type; - - 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, PAGE_KERNEL)); - flush_tlb_one(vaddr); - - return (void *) vaddr; -} - -static void __init kmap_pages_init(void) +void __init kmap_init(void) { unsigned long vaddr; pgd_t *pgd; @@ -96,14 +34,3 @@ static void __init kmap_pages_init(void) pte = pte_offset_kernel(pmd, vaddr); pkmap_page_table = pte; } - -void __init kmap_init(void) -{ - unsigned long vaddr; - - kmap_pages_init(); - - vaddr = __fix_to_virt(FIX_KMAP_BEGIN); - - kmap_pte = pte_offset_kernel((pmd_t *)pgd_offset_k(vaddr), vaddr); -} From patchwork Thu Oct 29 22:18:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11867751 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E57F61130 for ; Thu, 29 Oct 2020 22:32:31 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9245D20782 for ; Thu, 29 Oct 2020 22:32:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="nR23F05V"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="X2nf2oZ5" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9245D20782 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linutronix.de Authentication-Results: mail.kernel.org; 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Miller" , sparclinux@vger.kernel.org, Chris Zankel , Max Filippov , linux-xtensa@linux-xtensa.org Subject: [patch V2 08/18] microblaze/mm/highmem: Switch to generic kmap atomic References: <20201029221806.189523375@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: No reason having the same code in every architecture. Signed-off-by: Thomas Gleixner Cc: Michal Simek diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig index d262ac0c8714..186a0526564c 100644 --- a/arch/microblaze/Kconfig +++ b/arch/microblaze/Kconfig @@ -170,6 +170,7 @@ config XILINX_UNCACHED_SHADOW config HIGHMEM bool "High memory support" depends on MMU + select KMAP_LOCAL help The address space of Microblaze processors is only 4 Gigabytes large and it has to accommodate user address space, kernel address diff --git a/arch/microblaze/include/asm/highmem.h b/arch/microblaze/include/asm/highmem.h index 284ca8fb54c1..4418633fb163 100644 --- a/arch/microblaze/include/asm/highmem.h +++ b/arch/microblaze/include/asm/highmem.h @@ -25,7 +25,6 @@ #include #include -extern pte_t *kmap_pte; extern pte_t *pkmap_page_table; /* @@ -52,6 +51,11 @@ extern pte_t *pkmap_page_table; #define flush_cache_kmaps() { flush_icache(); flush_dcache(); } +#define arch_kmap_local_post_map(vaddr, pteval) \ + local_flush_tlb_page(NULL, vaddr); +#define arch_kmap_local_post_unmap(vaddr) \ + local_flush_tlb_page(NULL, vaddr); + #endif /* __KERNEL__ */ #endif /* _ASM_HIGHMEM_H */ diff --git a/arch/microblaze/mm/Makefile b/arch/microblaze/mm/Makefile index 1b16875cea70..8ced71100047 100644 --- a/arch/microblaze/mm/Makefile +++ b/arch/microblaze/mm/Makefile @@ -6,4 +6,3 @@ obj-y := consistent.o init.o obj-$(CONFIG_MMU) += pgtable.o mmu_context.o fault.o -obj-$(CONFIG_HIGHMEM) += highmem.o diff --git a/arch/microblaze/mm/highmem.c b/arch/microblaze/mm/highmem.c deleted file mode 100644 index 92e0890416c9..000000000000 --- a/arch/microblaze/mm/highmem.c +++ /dev/null @@ -1,78 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * highmem.c: virtual kernel memory mappings for high memory - * - * PowerPC version, stolen from the i386 version. - * - * Used in CONFIG_HIGHMEM systems for memory pages which - * are not addressable by direct kernel virtual addresses. - * - * Copyright (C) 1999 Gerhard Wichert, Siemens AG - * Gerhard.Wichert@pdb.siemens.de - * - * - * Redesigned the x86 32-bit VM architecture to deal with - * up to 16 Terrabyte physical memory. With current x86 CPUs - * we now support up to 64 Gigabytes physical RAM. - * - * Copyright (C) 1999 Ingo Molnar - * - * Reworked for PowerPC by various contributors. Moved from - * highmem.h by Benjamin Herrenschmidt (c) 2009 IBM Corp. - */ - -#include -#include - -/* - * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap - * gives a more generic (and caching) interface. But kmap_atomic can - * be used in IRQ contexts, so in some (very limited) cases we need - * it. - */ -#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); -#ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(!pte_none(*(kmap_pte-idx))); -#endif - set_pte_at(&init_mm, vaddr, kmap_pte-idx, mk_pte(page, prot)); - local_flush_tlb_page(NULL, vaddr); - - return (void *) vaddr; -} -EXPORT_SYMBOL(kmap_atomic_high_prot); - -void kunmap_atomic_high(void *kvaddr) -{ - unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; - int type; - unsigned int idx; - - if (vaddr < __fix_to_virt(FIX_KMAP_END)) - return; - - type = kmap_atomic_idx(); - - idx = type + KM_TYPE_NR * smp_processor_id(); -#ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(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 - */ - pte_clear(&init_mm, vaddr, kmap_pte-idx); - local_flush_tlb_page(NULL, vaddr); - - kmap_atomic_idx_pop(); -} -EXPORT_SYMBOL(kunmap_atomic_high); diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c index 3344d4a1fe89..3f4e41787a4e 100644 --- a/arch/microblaze/mm/init.c +++ b/arch/microblaze/mm/init.c @@ -49,17 +49,11 @@ unsigned long lowmem_size; EXPORT_SYMBOL(min_low_pfn); EXPORT_SYMBOL(max_low_pfn); -#ifdef CONFIG_HIGHMEM -pte_t *kmap_pte; -EXPORT_SYMBOL(kmap_pte); - static void __init highmem_init(void) { pr_debug("%x\n", (u32)PKMAP_BASE); map_page(PKMAP_BASE, 0, 0); /* XXX gross */ pkmap_page_table = virt_to_kpte(PKMAP_BASE); - - kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); } static void highmem_setup(void) From patchwork Thu Oct 29 22:18:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11867753 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B99AA1130 for ; 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bh=/OuOJDBSTYr3oNHxI4QIi4hU4+npD6o6bAOehLTNx4c=; b=vZyLTjIzU9k7xQOCipR1bc80iEErl2mbhdt3YPd+39LdH4ejIB+ygJekHICapKhvJdHuoF jLF9JFQmlcL5JeBQ== Date: Thu, 29 Oct 2020 23:18:15 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , Thomas Bogendoerfer , linux-mips@vger.kernel.org, Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Andrew Morton , linux-mm@kvack.org, x86@kernel.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Guo Ren , linux-csky@vger.kernel.org, Michal Simek , 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 Subject: [patch V2 09/18] mips/mm/highmem: Switch to generic kmap atomic References: <20201029221806.189523375@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: No reason having the same code in every architecture Signed-off-by: Thomas Gleixner Cc: Thomas Bogendoerfer Cc: linux-mips@vger.kernel.org diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 8f328298f8cc..ed6b3de944a8 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -2654,6 +2654,7 @@ config MIPS_CRC_SUPPORT config HIGHMEM bool "High Memory Support" depends on 32BIT && CPU_SUPPORTS_HIGHMEM && SYS_SUPPORTS_HIGHMEM && !CPU_MIPS32_3_5_EVA + select KMAP_LOCAL config CPU_SUPPORTS_HIGHMEM bool diff --git a/arch/mips/include/asm/highmem.h b/arch/mips/include/asm/highmem.h index f1f788b57166..cb2e0fb8483b 100644 --- a/arch/mips/include/asm/highmem.h +++ b/arch/mips/include/asm/highmem.h @@ -48,11 +48,11 @@ extern pte_t *pkmap_page_table; #define ARCH_HAS_KMAP_FLUSH_TLB extern void kmap_flush_tlb(unsigned long addr); -extern void *kmap_atomic_pfn(unsigned long pfn); #define flush_cache_kmaps() BUG_ON(cpu_has_dc_aliases) -extern void kmap_init(void); +#define arch_kmap_local_post_map(vaddr, pteval) local_flush_tlb_one(vaddr) +#define arch_kmap_local_post_unmap(vaddr) local_flush_tlb_one(vaddr) #endif /* __KERNEL__ */ diff --git a/arch/mips/mm/highmem.c b/arch/mips/mm/highmem.c index 5fec7f45d79a..57e2f08f00d0 100644 --- a/arch/mips/mm/highmem.c +++ b/arch/mips/mm/highmem.c @@ -8,8 +8,6 @@ #include #include -static pte_t *kmap_pte; - unsigned long highstart_pfn, highend_pfn; void kmap_flush_tlb(unsigned long addr) @@ -17,78 +15,3 @@ void kmap_flush_tlb(unsigned long addr) flush_tlb_one(addr); } EXPORT_SYMBOL(kmap_flush_tlb); - -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); -#ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(!pte_none(*(kmap_pte - idx))); -#endif - set_pte(kmap_pte-idx, mk_pte(page, prot)); - local_flush_tlb_one((unsigned long)vaddr); - - return (void*) vaddr; -} -EXPORT_SYMBOL(kmap_atomic_high_prot); - -void kunmap_atomic_high(void *kvaddr) -{ - unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; - int type __maybe_unused; - - if (vaddr < FIXADDR_START) - return; - - type = kmap_atomic_idx(); -#ifdef CONFIG_DEBUG_HIGHMEM - { - int idx = type + KM_TYPE_NR * smp_processor_id(); - - BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx)); - - /* - * force other mappings to Oops if they'll try to access - * this pte without first remap it - */ - pte_clear(&init_mm, vaddr, kmap_pte-idx); - local_flush_tlb_one(vaddr); - } -#endif - kmap_atomic_idx_pop(); -} -EXPORT_SYMBOL(kunmap_atomic_high); - -/* - * 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) -{ - 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, PAGE_KERNEL)); - flush_tlb_one(vaddr); - - return (void*) vaddr; -} - -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); -} diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c index 6c7bbfe35ba3..e5de8e9c2ede 100644 --- a/arch/mips/mm/init.c +++ b/arch/mips/mm/init.c @@ -402,9 +402,6 @@ void __init paging_init(void) pagetable_init(); -#ifdef CONFIG_HIGHMEM - kmap_init(); -#endif #ifdef CONFIG_ZONE_DMA max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; #endif From patchwork Thu Oct 29 22:18:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11867755 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7652B1130 for ; 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bh=AGKKN/OWJOyV6ZqbGmatCEZjrbL+jRdwO702UQOKIeg=; b=O8AlmHMsCzo7Zmi8ixcO2Lt7JF2PPuvsIr9ufc4XJP7K1yuLIBe/yvZzKNne5DOwOi+Apc 2ellyC9nc5i560Cg== Date: Thu, 29 Oct 2020 23:18:16 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , Nick Hu , Greentime Hu , Vincent Chen , Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Andrew Morton , linux-mm@kvack.org, x86@kernel.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Guo Ren , linux-csky@vger.kernel.org, Michal Simek , Thomas Bogendoerfer , linux-mips@vger.kernel.org, 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 Subject: [patch V2 10/18] nds32/mm/highmem: Switch to generic kmap atomic References: <20201029221806.189523375@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: The mapping code is odd and looks broken. See FIXME in the comment. Signed-off-by: Thomas Gleixner Cc: Nick Hu Cc: Greentime Hu Cc: Vincent Chen diff --git a/arch/nds32/Kconfig.cpu b/arch/nds32/Kconfig.cpu index f88a12fdf0f3..c7add11ea36e 100644 --- a/arch/nds32/Kconfig.cpu +++ b/arch/nds32/Kconfig.cpu @@ -157,6 +157,7 @@ config HW_SUPPORT_UNALIGNMENT_ACCESS config HIGHMEM bool "High Memory Support" depends on MMU && !CPU_CACHE_ALIASING + select KMAP_LOCAL help The address space of Andes processors is only 4 Gigabytes large and it has to accommodate user address space, kernel address diff --git a/arch/nds32/include/asm/highmem.h b/arch/nds32/include/asm/highmem.h index fe986d0e6e3f..d844c282c090 100644 --- a/arch/nds32/include/asm/highmem.h +++ b/arch/nds32/include/asm/highmem.h @@ -45,11 +45,22 @@ extern pte_t *pkmap_page_table; extern void kmap_init(void); /* - * The following functions are already defined by - * when CONFIG_HIGHMEM is not set. + * FIXME: The below looks broken vs. a kmap_atomic() in task context which + * is interupted and another kmap_atomic() happens in interrupt context. + * But what do I know about nds32. -- tglx */ -#ifdef CONFIG_HIGHMEM -extern void *kmap_atomic_pfn(unsigned long pfn); -#endif +#define arch_kmap_local_post_map(vaddr, pteval) \ + do { \ + __nds32__tlbop_inv(vaddr); \ + __nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN); \ + __nds32__tlbop_rwr(pteval); \ + __nds32__isb(); \ + } while (0) + +#define arch_kmap_local_pre_unmap(vaddr, pte) \ + do { \ + __nds32__tlbop_inv(vaddr); \ + __nds32__isb(); \ + } while (0) #endif diff --git a/arch/nds32/mm/Makefile b/arch/nds32/mm/Makefile index 897ecaf5cf54..14fb2e8eb036 100644 --- a/arch/nds32/mm/Makefile +++ b/arch/nds32/mm/Makefile @@ -3,7 +3,6 @@ obj-y := extable.o tlb.o fault.o init.o mmap.o \ mm-nds32.o cacheflush.o proc.o obj-$(CONFIG_ALIGNMENT_TRAP) += alignment.o -obj-$(CONFIG_HIGHMEM) += highmem.o ifdef CONFIG_FUNCTION_TRACER CFLAGS_REMOVE_proc.o = $(CC_FLAGS_FTRACE) diff --git a/arch/nds32/mm/highmem.c b/arch/nds32/mm/highmem.c deleted file mode 100644 index 4284cd59e21a..000000000000 --- a/arch/nds32/mm/highmem.c +++ /dev/null @@ -1,48 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -// Copyright (C) 2005-2017 Andes Technology Corporation - -#include -#include -#include -#include -#include -#include -#include -#include - -void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) -{ - unsigned int idx; - unsigned long vaddr, pte; - int type; - pte_t *ptep; - - type = kmap_atomic_idx_push(); - - idx = type + KM_TYPE_NR * smp_processor_id(); - vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); - pte = (page_to_pfn(page) << PAGE_SHIFT) | prot; - ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr); - set_pte(ptep, pte); - - __nds32__tlbop_inv(vaddr); - __nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN); - __nds32__tlbop_rwr(pte); - __nds32__isb(); - return (void *)vaddr; -} -EXPORT_SYMBOL(kmap_atomic_high_prot); - -void kunmap_atomic_high(void *kvaddr) -{ - if (kvaddr >= (void *)FIXADDR_START) { - unsigned long vaddr = (unsigned long)kvaddr; - pte_t *ptep; - kmap_atomic_idx_pop(); - __nds32__tlbop_inv(vaddr); - __nds32__isb(); - ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr); - set_pte(ptep, 0); - } -} -EXPORT_SYMBOL(kunmap_atomic_high); From patchwork Thu Oct 29 22:18:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11867757 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6CFFC697 for ; 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bh=mKqToMCt4TK857L6pxHu/gEBeaTgg/I0tChqKCuxQX4=; b=HxpVD2rY7MqmhvHwPuXswIG/rzdtissHt/T3LPe1/rTXCiyfxOrWzI7fQMiVzATIzNobbU 5pcryDtXkN5Hm+Dg== Date: Thu, 29 Oct 2020 23:18:17 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , linuxppc-dev@lists.ozlabs.org, Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Andrew Morton , linux-mm@kvack.org, x86@kernel.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Guo Ren , linux-csky@vger.kernel.org, Michal Simek , Thomas Bogendoerfer , linux-mips@vger.kernel.org, Nick Hu , Greentime Hu , Vincent Chen , "David S. Miller" , sparclinux@vger.kernel.org, Chris Zankel , Max Filippov , linux-xtensa@linux-xtensa.org Subject: [patch V2 11/18] powerpc/mm/highmem: Switch to generic kmap atomic References: <20201029221806.189523375@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: No reason having the same code in every architecture Signed-off-by: Thomas Gleixner Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: linuxppc-dev@lists.ozlabs.org --- arch/powerpc/Kconfig | 1 arch/powerpc/include/asm/highmem.h | 6 ++- arch/powerpc/mm/Makefile | 1 arch/powerpc/mm/highmem.c | 67 ------------------------------------- arch/powerpc/mm/mem.c | 7 --- 5 files changed, 6 insertions(+), 76 deletions(-) --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -409,6 +409,7 @@ menu "Kernel options" config HIGHMEM bool "High memory support" depends on PPC32 + select KMAP_LOCAL source "kernel/Kconfig.hz" --- a/arch/powerpc/include/asm/highmem.h +++ b/arch/powerpc/include/asm/highmem.h @@ -29,7 +29,6 @@ #include #include -extern pte_t *kmap_pte; extern pte_t *pkmap_page_table; /* @@ -60,6 +59,11 @@ extern pte_t *pkmap_page_table; #define flush_cache_kmaps() flush_cache_all() +#define arch_kmap_local_post_map(vaddr, pteval) \ + local_flush_tlb_page(NULL, vaddr) +#define arch_kmap_local_post_unmap(vaddr) \ + local_flush_tlb_page(NULL, vaddr) + #endif /* __KERNEL__ */ #endif /* _ASM_HIGHMEM_H */ --- a/arch/powerpc/mm/Makefile +++ b/arch/powerpc/mm/Makefile @@ -16,7 +16,6 @@ obj-$(CONFIG_NEED_MULTIPLE_NODES) += num obj-$(CONFIG_PPC_MM_SLICES) += slice.o obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o obj-$(CONFIG_NOT_COHERENT_CACHE) += dma-noncoherent.o -obj-$(CONFIG_HIGHMEM) += highmem.o obj-$(CONFIG_PPC_COPRO_BASE) += copro_fault.o obj-$(CONFIG_PPC_PTDUMP) += ptdump/ obj-$(CONFIG_KASAN) += kasan/ --- a/arch/powerpc/mm/highmem.c +++ /dev/null @@ -1,67 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * highmem.c: virtual kernel memory mappings for high memory - * - * PowerPC version, stolen from the i386 version. - * - * Used in CONFIG_HIGHMEM systems for memory pages which - * are not addressable by direct kernel virtual addresses. - * - * Copyright (C) 1999 Gerhard Wichert, Siemens AG - * Gerhard.Wichert@pdb.siemens.de - * - * - * Redesigned the x86 32-bit VM architecture to deal with - * up to 16 Terrabyte physical memory. With current x86 CPUs - * we now support up to 64 Gigabytes physical RAM. - * - * Copyright (C) 1999 Ingo Molnar - * - * Reworked for PowerPC by various contributors. Moved from - * highmem.h by Benjamin Herrenschmidt (c) 2009 IBM Corp. - */ - -#include -#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); - WARN_ON(IS_ENABLED(CONFIG_DEBUG_HIGHMEM) && !pte_none(*(kmap_pte - idx))); - __set_pte_at(&init_mm, vaddr, kmap_pte-idx, mk_pte(page, prot), 1); - local_flush_tlb_page(NULL, vaddr); - - return (void*) vaddr; -} -EXPORT_SYMBOL(kmap_atomic_high_prot); - -void kunmap_atomic_high(void *kvaddr) -{ - unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; - - if (vaddr < __fix_to_virt(FIX_KMAP_END)) - return; - - if (IS_ENABLED(CONFIG_DEBUG_HIGHMEM)) { - int type = kmap_atomic_idx(); - unsigned int idx; - - idx = type + KM_TYPE_NR * smp_processor_id(); - WARN_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx)); - - /* - * force other mappings to Oops if they'll try to access - * this pte without first remap it - */ - pte_clear(&init_mm, vaddr, kmap_pte-idx); - local_flush_tlb_page(NULL, vaddr); - } - - kmap_atomic_idx_pop(); -} -EXPORT_SYMBOL(kunmap_atomic_high); --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -61,11 +61,6 @@ unsigned long long memory_limit; bool init_mem_is_free; -#ifdef CONFIG_HIGHMEM -pte_t *kmap_pte; -EXPORT_SYMBOL(kmap_pte); -#endif - pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size, pgprot_t vma_prot) { @@ -235,8 +230,6 @@ void __init paging_init(void) map_kernel_page(PKMAP_BASE, 0, __pgprot(0)); /* XXX gross */ pkmap_page_table = virt_to_kpte(PKMAP_BASE); - - kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); #endif /* CONFIG_HIGHMEM */ printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n", From patchwork Thu Oct 29 22:18:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11867761 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D63581130 for ; 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Thu, 29 Oct 2020 22:32:24 +0000 (UTC) Message-Id: <20201029222651.790791701@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1604010743; 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=PJTgDGv1EffJTXrMYc/qet2rozVCckqqTczUm2p7QkU=; b=nQdMp28ar6VGNzDIj4XPmLBII+OX/rmncA8I2i7PtrqfapOORBCV9cDTdIVadbSKJGDqIr 3E3lzQICDs7WN+H1oWFYNS+9+6TRhHFida5q8gelWGc0iMYnr48c/O2kfGmsj0Sp92JZ7w 52/UmXYMik/eqdW1/uix5+lp3FXkMc3nglBYa2pAxbbIsQCA3Kl02zEgYm2IEcXXa7mw8+ Dn6vxV17oY5iAQrzBf4r6rvNIY5i+5PhMcf7q6Tnox/iS45+G7+6p4yCfQkuHPYhzAazf0 qSo2vMx/UNfMEx7wLhScAihBeO4P65u6udnGXmTTNY4yaDtVyUN3Q2tLXVnsgA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1604010743; 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=PJTgDGv1EffJTXrMYc/qet2rozVCckqqTczUm2p7QkU=; b=kUqRTEbUyiLik2xVZgpWUuOyc5IpFxYB9mOTPPezew6l8ha+23s3Q3Ptzy1Z8AbgXIp6Id fnOSWlXpEN9DaEAg== Date: Thu, 29 Oct 2020 23:18:18 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , "David S. Miller" , sparclinux@vger.kernel.org, Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Andrew Morton , linux-mm@kvack.org, x86@kernel.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Guo Ren , 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, Chris Zankel , Max Filippov , linux-xtensa@linux-xtensa.org Subject: [patch V2 12/18] sparc/mm/highmem: Switch to generic kmap atomic References: <20201029221806.189523375@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: No reason having the same code in every architecture Signed-off-by: Thomas Gleixner Cc: "David S. Miller" Cc: sparclinux@vger.kernel.org --- arch/sparc/Kconfig | 1 arch/sparc/include/asm/highmem.h | 7 +- arch/sparc/mm/Makefile | 3 - arch/sparc/mm/highmem.c | 115 --------------------------------------- arch/sparc/mm/srmmu.c | 2 5 files changed, 6 insertions(+), 122 deletions(-) --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -139,6 +139,7 @@ config MMU config HIGHMEM bool default y if SPARC32 + select KMAP_LOCAL config ZONE_DMA bool --- a/arch/sparc/include/asm/highmem.h +++ b/arch/sparc/include/asm/highmem.h @@ -33,8 +33,6 @@ extern unsigned long highstart_pfn, high #define kmap_prot __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE) extern pte_t *pkmap_page_table; -void kmap_init(void) __init; - /* * Right now we initialize only a single pte table. It can be extended * easily, subsequent pte tables have to be allocated in one physical @@ -53,6 +51,11 @@ void kmap_init(void) __init; #define flush_cache_kmaps() flush_cache_all() +/* FIXME: Use __flush_tlb_one(vaddr) instead of flush_cache_all() -- Anton */ +#define arch_kmap_local_post_map(vaddr, pteval) flush_cache_all() +#define arch_kmap_local_post_unmap(vaddr) flush_cache_all() + + #endif /* __KERNEL__ */ #endif /* _ASM_HIGHMEM_H */ --- a/arch/sparc/mm/Makefile +++ b/arch/sparc/mm/Makefile @@ -15,6 +15,3 @@ obj-$(CONFIG_SPARC32) += leon_mm.o # Only used by sparc64 obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o - -# Only used by sparc32 -obj-$(CONFIG_HIGHMEM) += highmem.o --- a/arch/sparc/mm/highmem.c +++ /dev/null @@ -1,115 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * highmem.c: virtual kernel memory mappings for high memory - * - * Provides kernel-static versions of atomic kmap functions originally - * found as inlines in include/asm-sparc/highmem.h. These became - * needed as kmap_atomic() and kunmap_atomic() started getting - * called from within modules. - * -- Tomas Szepe , September 2002 - * - * But kmap_atomic() and kunmap_atomic() cannot be inlined in - * modules because they are loaded with btfixup-ped functions. - */ - -/* - * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap - * gives a more generic (and caching) interface. But kmap_atomic can - * be used in IRQ contexts, so in some (very limited) cases we need it. - * - * XXX This is an old text. Actually, it's good to use atomic kmaps, - * provided you remember that they are atomic and not try to sleep - * with a kmap taken, much like a spinlock. Non-atomic kmaps are - * shared by CPUs, and so precious, and establishing them requires IPI. - * Atomic kmaps are lightweight and we may have NCPUS more of them. - */ -#include -#include -#include - -#include -#include -#include - -static pte_t *kmap_pte; - -void __init kmap_init(void) -{ - unsigned long address = __fix_to_virt(FIX_KMAP_BEGIN); - - /* cache the first kmap pte */ - kmap_pte = virt_to_kpte(address); -} - -void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) -{ - unsigned long vaddr; - long idx, type; - - type = kmap_atomic_idx_push(); - idx = type + KM_TYPE_NR*smp_processor_id(); - vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); - -/* XXX Fix - Anton */ -#if 0 - __flush_cache_one(vaddr); -#else - flush_cache_all(); -#endif - -#ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(!pte_none(*(kmap_pte-idx))); -#endif - set_pte(kmap_pte-idx, mk_pte(page, prot)); -/* XXX Fix - Anton */ -#if 0 - __flush_tlb_one(vaddr); -#else - flush_tlb_all(); -#endif - - return (void*) vaddr; -} -EXPORT_SYMBOL(kmap_atomic_high_prot); - -void kunmap_atomic_high(void *kvaddr) -{ - unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; - int type; - - if (vaddr < FIXADDR_START) - return; - - type = kmap_atomic_idx(); - -#ifdef CONFIG_DEBUG_HIGHMEM - { - unsigned long idx; - - idx = type + KM_TYPE_NR * smp_processor_id(); - BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN+idx)); - - /* XXX Fix - Anton */ -#if 0 - __flush_cache_one(vaddr); -#else - flush_cache_all(); -#endif - - /* - * force other mappings to Oops if they'll try to access - * this pte without first remap it - */ - pte_clear(&init_mm, vaddr, kmap_pte-idx); - /* XXX Fix - Anton */ -#if 0 - __flush_tlb_one(vaddr); -#else - flush_tlb_all(); -#endif - } -#endif - - kmap_atomic_idx_pop(); -} -EXPORT_SYMBOL(kunmap_atomic_high); --- a/arch/sparc/mm/srmmu.c +++ b/arch/sparc/mm/srmmu.c @@ -971,8 +971,6 @@ void __init srmmu_paging_init(void) sparc_context_init(num_contexts); - kmap_init(); - { unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 }; From patchwork Thu Oct 29 22:18:19 2020 Content-Type: text/plain; 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bh=LufW3kO54Nr2100PGampKWimA5aEr8Imx1WFVO7xrw4=; b=J4VL1zNL7oBS8xSf4hW/0svoZPMGaKoJMwK2efYvA+sVXzcWMChJ2eGLsxyFbxD64uPr9d GMJEsGE96Dl8XECg== Date: Thu, 29 Oct 2020 23:18:19 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , 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 , Andrew Morton , linux-mm@kvack.org, x86@kernel.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Guo Ren , 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 Subject: [patch V2 13/18] xtensa/mm/highmem: Switch to generic kmap atomic References: <20201029221806.189523375@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: No reason having the same code in every architecture Signed-off-by: Thomas Gleixner Cc: Chris Zankel Cc: Max Filippov Cc: linux-xtensa@linux-xtensa.org --- arch/xtensa/Kconfig | 1 arch/xtensa/include/asm/highmem.h | 9 +++++++ arch/xtensa/mm/highmem.c | 44 +++----------------------------------- 3 files changed, 14 insertions(+), 40 deletions(-) --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -666,6 +666,7 @@ endchoice config HIGHMEM bool "High Memory Support" depends on MMU + select KMAP_LOCAL help Linux can use the full amount of RAM in the system by default. However, the default MMUv2 setup only maps the --- a/arch/xtensa/include/asm/highmem.h +++ b/arch/xtensa/include/asm/highmem.h @@ -68,6 +68,15 @@ static inline void flush_cache_kmaps(voi flush_cache_all(); } +enum fixed_addresses kmap_local_map_idx(int type, unsigned long pfn); +#define arch_kmap_local_map_idx kmap_local_map_idx + +enum fixed_addresses kmap_local_unmap_idx(int type, unsigned long addr); +#define arch_kmap_local_unmap_idx kmap_local_unmap_idx + +#define arch_kmap_local_post_unmap(vaddr) \ + local_flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE) + void kmap_init(void); #endif --- a/arch/xtensa/mm/highmem.c +++ b/arch/xtensa/mm/highmem.c @@ -12,8 +12,6 @@ #include #include -static pte_t *kmap_pte; - #if DCACHE_WAY_SIZE > PAGE_SIZE unsigned int last_pkmap_nr_arr[DCACHE_N_COLORS]; wait_queue_head_t pkmap_map_wait_arr[DCACHE_N_COLORS]; @@ -37,55 +35,21 @@ static inline enum fixed_addresses kmap_ color; } -void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) +enum fixed_addresses kmap_local_map_idx(int type, unsigned long pfn) { - enum fixed_addresses idx; - unsigned long vaddr; - - idx = kmap_idx(kmap_atomic_idx_push(), - DCACHE_ALIAS(page_to_phys(page))); - vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); -#ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(!pte_none(*(kmap_pte + idx))); -#endif - set_pte(kmap_pte + idx, mk_pte(page, prot)); - - return (void *)vaddr; + return kmap_idx(type, DCACHE_ALIAS(pfn << PAGE_SHIFT); } -EXPORT_SYMBOL(kmap_atomic_high_prot); -void kunmap_atomic_high(void *kvaddr) +enum fixed_addresses kmap_local_unmap_idx(int type, unsigned long addr) { - if (kvaddr >= (void *)FIXADDR_START && - kvaddr < (void *)FIXADDR_TOP) { - int idx = kmap_idx(kmap_atomic_idx(), - DCACHE_ALIAS((unsigned long)kvaddr)); - - /* - * 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. - */ - pte_clear(&init_mm, kvaddr, kmap_pte + idx); - local_flush_tlb_kernel_range((unsigned long)kvaddr, - (unsigned long)kvaddr + PAGE_SIZE); - - kmap_atomic_idx_pop(); - } + return kmap_idx(type, DCACHE_ALIAS(addr)); } -EXPORT_SYMBOL(kunmap_atomic_high); void __init kmap_init(void) { - unsigned long kmap_vstart; - /* Check if this memory layout is broken because PKMAP overlaps * page table. */ BUILD_BUG_ON(PKMAP_BASE < TLBTEMP_BASE_1 + TLBTEMP_SIZE); - /* cache the first kmap pte */ - kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); - kmap_pte = virt_to_kpte(kmap_vstart); kmap_waitqueues_init(); } From patchwork Thu Oct 29 22:18:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11867769 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 06F4714B7 for ; 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bh=pxWDXms+RLkdR685wH8ReSSfYlwhM44TN2eNrBZ0TPg=; b=o9n2jAfx/7g/livoK+SKJuw+8e87tZ3f+Wo2TY4l/RKb9olw+TceYAFR+B2166FCpRCMRt xhrVQDKRQGrW/sCQ== Date: Thu, 29 Oct 2020 23:18:20 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Andrew Morton , linux-mm@kvack.org, x86@kernel.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Guo Ren , 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 Subject: [patch V2 14/18] mm/highmem: Remove the old kmap_atomic cruft References: <20201029221806.189523375@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: All users gone. Signed-off-by: Thomas Gleixner --- include/linux/highmem.h | 61 ++---------------------------------------------- mm/highmem.c | 28 ++++++++++++++++++---- 2 files changed, 27 insertions(+), 62 deletions(-) --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -88,31 +88,16 @@ static inline void kunmap(struct page *p * be used in IRQ contexts, so in some (very limited) cases we need * it. */ - -#ifndef CONFIG_KMAP_LOCAL -void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); -void kunmap_atomic_high(void *kvaddr); - static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot) { preempt_disable(); pagefault_disable(); - if (!PageHighMem(page)) - return page_address(page); - return kmap_atomic_high_prot(page, prot); -} - -static inline void __kunmap_atomic(void *vaddr) -{ - kunmap_atomic_high(vaddr); + return __kmap_local_page_prot(page, prot); } -#else /* !CONFIG_KMAP_LOCAL */ -static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot) +static inline void *kmap_atomic(struct page *page) { - preempt_disable(); - pagefault_disable(); - return __kmap_local_page_prot(page, prot); + return kmap_atomic_prot(page, kmap_prot); } static inline void *kmap_atomic_pfn(unsigned long pfn) @@ -127,13 +112,6 @@ static inline void __kunmap_atomic(void kunmap_local_indexed(addr); } -#endif /* CONFIG_KMAP_LOCAL */ - -static inline void *kmap_atomic(struct page *page) -{ - return kmap_atomic_prot(page, kmap_prot); -} - /* declarations for linux/mm/highmem.c */ unsigned int nr_free_highpages(void); extern atomic_long_t _totalhigh_pages; @@ -226,39 +204,6 @@ static inline void __kunmap_atomic(void #endif /* CONFIG_HIGHMEM */ -#if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32) - -DECLARE_PER_CPU(int, __kmap_atomic_idx); - -static inline int kmap_atomic_idx_push(void) -{ - int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1; - -#ifdef CONFIG_DEBUG_HIGHMEM - WARN_ON_ONCE(in_irq() && !irqs_disabled()); - BUG_ON(idx >= KM_TYPE_NR); -#endif - return idx; -} - -static inline int kmap_atomic_idx(void) -{ - return __this_cpu_read(__kmap_atomic_idx) - 1; -} - -static inline void kmap_atomic_idx_pop(void) -{ -#ifdef CONFIG_DEBUG_HIGHMEM - int idx = __this_cpu_dec_return(__kmap_atomic_idx); - - BUG_ON(idx < 0); -#else - __this_cpu_dec(__kmap_atomic_idx); -#endif -} - -#endif - /* * Prevent people trying to call kunmap_atomic() as if it were kunmap() * kunmap_atomic() should get the return value of kmap_atomic, not the page. --- a/mm/highmem.c +++ b/mm/highmem.c @@ -32,10 +32,6 @@ #include #include -#if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32) -DEFINE_PER_CPU(int, __kmap_atomic_idx); -#endif - /* * Virtual_count is not a pure "count". * 0 means that it is not mapped, and has not been mapped @@ -370,6 +366,30 @@ EXPORT_SYMBOL(kunmap_high); #endif /* CONFIG_HIGHMEM */ #ifdef CONFIG_KMAP_LOCAL + +static DEFINE_PER_CPU(int, __kmap_atomic_idx); + +static inline int kmap_atomic_idx_push(void) +{ + int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1; + + WARN_ON_ONCE(in_irq() && !irqs_disabled()); + BUG_ON(idx >= KM_TYPE_NR); + return idx; +} + +static inline int kmap_atomic_idx(void) +{ + return __this_cpu_read(__kmap_atomic_idx) - 1; +} + +static inline void kmap_atomic_idx_pop(void) +{ + int idx = __this_cpu_dec_return(__kmap_atomic_idx); + + BUG_ON(idx < 0); +} + #ifndef arch_kmap_local_post_map # define arch_kmap_local_post_map(vaddr, pteval) do { } while (0) #endif From patchwork Thu Oct 29 22:18:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11867771 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 30697697 for ; Thu, 29 Oct 2020 22:32:46 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D629E2076B for ; Thu, 29 Oct 2020 22:32:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="OGd5ItDy"; 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Miller" , sparclinux@vger.kernel.org, Chris Zankel , Max Filippov , linux-xtensa@linux-xtensa.org Subject: [patch V2 15/18] io-mapping: Cleanup atomic iomap References: <20201029221806.189523375@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: Switch the atomic iomap implementation over to kmap_local and stick the preempt/pagefault mechanics into the generic code similar to the kmap_atomic variants. Rename the x86 map function in preparation for a non-atomic variant. Signed-off-by: Thomas Gleixner --- V2: New patch to make review easier --- arch/x86/include/asm/iomap.h | 9 +-------- arch/x86/mm/iomap_32.c | 6 ++---- include/linux/io-mapping.h | 8 ++++++-- 3 files changed, 9 insertions(+), 14 deletions(-) --- a/arch/x86/include/asm/iomap.h +++ b/arch/x86/include/asm/iomap.h @@ -13,14 +13,7 @@ #include #include -void __iomem *iomap_atomic_pfn_prot(unsigned long pfn, pgprot_t prot); - -static inline void iounmap_atomic(void __iomem *vaddr) -{ - kunmap_local_indexed((void __force *)vaddr); - pagefault_enable(); - preempt_enable(); -} +void __iomem *__iomap_local_pfn_prot(unsigned long pfn, pgprot_t prot); int iomap_create_wc(resource_size_t base, unsigned long size, pgprot_t *prot); --- a/arch/x86/mm/iomap_32.c +++ b/arch/x86/mm/iomap_32.c @@ -44,7 +44,7 @@ void iomap_free(resource_size_t base, un } EXPORT_SYMBOL_GPL(iomap_free); -void __iomem *iomap_atomic_pfn_prot(unsigned long pfn, pgprot_t prot) +void __iomem *__iomap_local_pfn_prot(unsigned long pfn, pgprot_t prot) { /* * For non-PAT systems, translate non-WB request to UC- just in @@ -60,8 +60,6 @@ void __iomem *iomap_atomic_pfn_prot(unsi /* Filter out unsupported __PAGE_KERNEL* bits: */ pgprot_val(prot) &= __default_kernel_pte_mask; - preempt_disable(); - pagefault_disable(); return (void __force __iomem *)__kmap_local_pfn_prot(pfn, prot); } -EXPORT_SYMBOL_GPL(iomap_atomic_pfn_prot); +EXPORT_SYMBOL_GPL(__iomap_local_pfn_prot); --- a/include/linux/io-mapping.h +++ b/include/linux/io-mapping.h @@ -69,13 +69,17 @@ io_mapping_map_atomic_wc(struct io_mappi BUG_ON(offset >= mapping->size); phys_addr = mapping->base + offset; - return iomap_atomic_pfn_prot(PHYS_PFN(phys_addr), mapping->prot); + preempt_disable(); + pagefault_disable(); + return __iomap_local_pfn_prot(PHYS_PFN(phys_addr), mapping->prot); } static inline void io_mapping_unmap_atomic(void __iomem *vaddr) { - iounmap_atomic(vaddr); + kunmap_local_indexed((void __force *)vaddr); + pagefault_enable(); + preempt_enable(); } static inline void __iomem * From patchwork Thu Oct 29 22:18:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11867773 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6219F697 for ; 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bh=sdXI7uto7JGSNPM0IVUoIg2pbKsluCZDYWtwfegzM8w=; b=2P8kK3cKzIGAVVEcZXJVGmyGsyPoNrPQWyv/xRi4meWRIELqGztBgTX8k0SbykrmKDkQmG lS1o8L5loEELkyBQ== Date: Thu, 29 Oct 2020 23:18:22 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Andrew Morton , linux-mm@kvack.org, x86@kernel.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Guo Ren , 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 Subject: [patch V2 16/18] sched: highmem: Store local kmaps in task struct References: <20201029221806.189523375@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: Instead of storing the map per CPU provide and use per task storage. That prepares for local kmaps which are preemptible. The context switch code is preparatory and not yet in use because kmap_atomic() runs with preemption disabled. Will be made usable in the next step. The context switch logic is safe even when an interrupt happens after clearing or before restoring the kmaps. The kmap index in task struct is not modified so any nesting kmap in an interrupt will use unused indices and on return the counter is the same as before. Also add an assert into the return to user space code. Going back to user space with an active kmap local is a nono. Signed-off-by: Thomas Gleixner --- include/linux/highmem.h | 10 +++++ include/linux/sched.h | 9 ++++ kernel/entry/common.c | 2 + kernel/fork.c | 1 kernel/sched/core.c | 18 +++++++++ mm/highmem.c | 96 +++++++++++++++++++++++++++++++++++++++++------- 6 files changed, 123 insertions(+), 13 deletions(-) --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -38,6 +38,16 @@ static inline void invalidate_kernel_vma void *__kmap_local_pfn_prot(unsigned long pfn, pgprot_t prot); void *__kmap_local_page_prot(struct page *page, pgprot_t prot); void kunmap_local_indexed(void *vaddr); +void kmap_local_fork(struct task_struct *tsk); +void __kmap_local_sched_out(void); +void __kmap_local_sched_in(void); +static inline void kmap_assert_nomap(void) +{ + DEBUG_LOCKS_WARN_ON(current->kmap_ctrl.idx); +} +#else +static inline void kmap_local_fork(struct task_struct *tsk) { } +static inline void kmap_assert_nomap(void) { } #endif #ifdef CONFIG_HIGHMEM --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -34,6 +34,7 @@ #include #include #include +#include /* task_struct member predeclarations (sorted alphabetically): */ struct audit_context; @@ -629,6 +630,13 @@ struct wake_q_node { struct wake_q_node *next; }; +struct kmap_ctrl { +#ifdef CONFIG_KMAP_LOCAL + int idx; + pte_t pteval[KM_TYPE_NR]; +#endif +}; + struct task_struct { #ifdef CONFIG_THREAD_INFO_IN_TASK /* @@ -1294,6 +1302,7 @@ struct task_struct { unsigned int sequential_io; unsigned int sequential_io_avg; #endif + struct kmap_ctrl kmap_ctrl; #ifdef CONFIG_DEBUG_ATOMIC_SLEEP unsigned long task_state_change; #endif --- a/kernel/entry/common.c +++ b/kernel/entry/common.c @@ -2,6 +2,7 @@ #include #include +#include #include #include @@ -194,6 +195,7 @@ static void exit_to_user_mode_prepare(st /* Ensure that the address limit is intact and no locks are held */ addr_limit_user_check(); + kmap_assert_nomap(); lockdep_assert_irqs_disabled(); lockdep_sys_exit(); } --- a/kernel/fork.c +++ b/kernel/fork.c @@ -930,6 +930,7 @@ static struct task_struct *dup_task_stru account_kernel_stack(tsk, 1); kcov_task_init(tsk); + kmap_local_fork(tsk); #ifdef CONFIG_FAULT_INJECTION tsk->fail_nth = 0; --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -4053,6 +4053,22 @@ static inline void finish_lock_switch(st # define finish_arch_post_lock_switch() do { } while (0) #endif +static inline void kmap_local_sched_out(void) +{ +#ifdef CONFIG_KMAP_LOCAL + if (unlikely(current->kmap_ctrl.idx)) + __kmap_local_sched_out(); +#endif +} + +static inline void kmap_local_sched_in(void) +{ +#ifdef CONFIG_KMAP_LOCAL + if (unlikely(current->kmap_ctrl.idx)) + __kmap_local_sched_in(); +#endif +} + /** * prepare_task_switch - prepare to switch tasks * @rq: the runqueue preparing to switch @@ -4075,6 +4091,7 @@ prepare_task_switch(struct rq *rq, struc perf_event_task_sched_out(prev, next); rseq_preempt(prev); fire_sched_out_preempt_notifiers(prev, next); + kmap_local_sched_out(); prepare_task(next); prepare_arch_switch(next); } @@ -4141,6 +4158,7 @@ static struct rq *finish_task_switch(str finish_lock_switch(rq); finish_arch_post_lock_switch(); kcov_finish_switch(current); + kmap_local_sched_in(); fire_sched_in_preempt_notifiers(current); /* --- a/mm/highmem.c +++ b/mm/highmem.c @@ -367,27 +367,24 @@ EXPORT_SYMBOL(kunmap_high); #ifdef CONFIG_KMAP_LOCAL -static DEFINE_PER_CPU(int, __kmap_atomic_idx); - -static inline int kmap_atomic_idx_push(void) +static inline int kmap_local_idx_push(void) { - int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1; + int idx = current->kmap_ctrl.idx++; WARN_ON_ONCE(in_irq() && !irqs_disabled()); BUG_ON(idx >= KM_TYPE_NR); return idx; } -static inline int kmap_atomic_idx(void) +static inline int kmap_local_idx(void) { - return __this_cpu_read(__kmap_atomic_idx) - 1; + return current->kmap_ctrl.idx - 1; } -static inline void kmap_atomic_idx_pop(void) +static inline void kmap_local_idx_pop(void) { - int idx = __this_cpu_dec_return(__kmap_atomic_idx); - - BUG_ON(idx < 0); + current->kmap_ctrl.idx--; + BUG_ON(current->kmap_ctrl.idx < 0); } #ifndef arch_kmap_local_post_map @@ -447,12 +444,13 @@ void *__kmap_local_pfn_prot(unsigned lon int idx; preempt_disable(); - idx = arch_kmap_local_map_idx(kmap_atomic_idx_push(), pfn); + idx = arch_kmap_local_map_idx(kmap_local_idx_push(), pfn); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); BUG_ON(!pte_none(*(kmap_pte - idx))); pteval = pfn_pte(pfn, prot); set_pte_at(&init_mm, vaddr, kmap_pte - idx, pteval); arch_kmap_local_post_map(vaddr, pteval); + current->kmap_ctrl.pteval[kmap_local_idx()] = pteval; preempt_enable(); return (void *)vaddr; @@ -491,16 +489,88 @@ void kunmap_local_indexed(void *vaddr) } preempt_disable(); - idx = arch_kmap_local_unmap_idx(kmap_atomic_idx(), addr); + idx = arch_kmap_local_unmap_idx(kmap_local_idx(), addr); WARN_ON_ONCE(addr != __fix_to_virt(FIX_KMAP_BEGIN + idx)); arch_kmap_local_pre_unmap(addr); pte_clear(&init_mm, addr, kmap_pte - idx); arch_kmap_local_post_unmap(addr); - kmap_atomic_idx_pop(); + current->kmap_ctrl.pteval[kmap_local_idx()] = __pte(0); + kmap_local_idx_pop(); preempt_enable(); } EXPORT_SYMBOL(kunmap_local_indexed); + +/* + * Invoked before switch_to(). This is safe even when during or after + * clearing the maps an interrupt which needs a kmap_local happens because + * the task::kmap_ctrl.idx is not modified by the unmapping code so a + * nested kmap_local will use the next unused index and restore the index + * on unmap. The already cleared kmaps of the outgoing task are irrelevant + * because the interrupt context does not know about them. The same applies + * when scheduling back in for an interrupt which happens before the + * restore is complete. + */ +void __kmap_local_sched_out(void) +{ + struct task_struct *tsk = current; + pte_t *kmap_pte = kmap_get_pte(); + int i; + + /* Clear kmaps */ + for (i = 0; i < tsk->kmap_ctrl.idx; i++) { + pte_t pteval = tsk->kmap_ctrl.pteval[i]; + unsigned long addr; + int idx; + + if (WARN_ON_ONCE(pte_none(pteval))) + continue; + + /* + * This is a horrible hack for XTENSA to calculate the + * coloured PTE index. Uses the PFN encoded into the pteval + * and the map index calculation because the actual mapped + * virtual address is not stored in task::kmap_ctrl. + * For any sane architecture this is optimized out. + */ + idx = arch_kmap_local_map_idx(i, pte_pfn(pteval)); + + addr = __fix_to_virt(FIX_KMAP_BEGIN + idx); + arch_kmap_local_pre_unmap(addr); + pte_clear(&init_mm, addr, kmap_pte - idx); + arch_kmap_local_post_unmap(addr); + } +} + +void __kmap_local_sched_in(void) +{ + struct task_struct *tsk = current; + pte_t *kmap_pte = kmap_get_pte(); + int i; + + /* Restore kmaps */ + for (i = 0; i < tsk->kmap_ctrl.idx; i++) { + pte_t pteval = tsk->kmap_ctrl.pteval[i]; + unsigned long addr; + int idx; + + if (WARN_ON_ONCE(pte_none(pteval))) + continue; + + /* See comment in __kmap_local_sched_out() */ + idx = arch_kmap_local_map_idx(i, pte_pfn(pteval)); + addr = __fix_to_virt(FIX_KMAP_BEGIN + idx); + set_pte_at(&init_mm, addr, kmap_pte - idx, pteval); + arch_kmap_local_post_map(addr, pteval); + } +} + +void kmap_local_fork(struct task_struct *tsk) +{ + if (WARN_ON_ONCE(tsk->kmap_ctrl.idx)) + memset(&tsk->kmap_ctrl, 0, sizeof(tsk->kmap_ctrl)); +} + #endif #if defined(HASHED_PAGE_VIRTUAL) From patchwork Thu Oct 29 22:18:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11867775 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D351D1130 for ; Thu, 29 Oct 2020 22:32:50 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 7014520791 for ; Thu, 29 Oct 2020 22:32:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="g9uiGxDo"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="luMtij7p" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7014520791 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linutronix.de Authentication-Results: mail.kernel.org; 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bh=qNblSYL+PvuzH63KJpcNLXY4ezwTF2j8DGcTkrl8CzE=; b=luMtij7pyzuhRYRe4DwSHukATlmykltgP/ZHYRb8RL2JeQG6QeudIS3wZ/jzIUh0L95Z5o c6mGwkQdF0Dg0tAA== Date: Thu, 29 Oct 2020 23:18:23 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Andrew Morton , linux-mm@kvack.org, x86@kernel.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Guo Ren , 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 Subject: [patch V2 17/18] mm/highmem: Provide kmap_local* References: <20201029221806.189523375@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: Now that the kmap atomic index is stored in task struct provide a preemptible variant. On context switch the maps of an outgoing task are removed and the map of the incoming task are restored. That's obviously slow, but highmem is slow anyway. The kmap_local.*() functions can be invoked from both preemptible and atomic context. kmap local sections disable migration to keep the resulting virtual mapping address correct, but disable neither pagefaults nor preemption. A wholesale conversion of kmap_atomic to be fully preemptible is not possible because some of the usage sites might rely on the preemption disable for serialization or on the implicit pagefault disable. Needs to be done on a case by case basis. Signed-off-by: Thomas Gleixner --- V2: Make it more consistent and add commentry --- include/linux/highmem.h | 115 +++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 100 insertions(+), 15 deletions(-) --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -86,17 +86,56 @@ static inline void kunmap(struct page *p } /* - * kmap_atomic/kunmap_atomic is significantly faster than kmap/kunmap because - * no global lock is needed and because the kmap code must perform a global TLB - * invalidation when the kmap pool wraps. - * - * However when holding an atomic kmap it is not legal to sleep, so atomic - * kmaps are appropriate for short, tight code paths only. - * - * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap - * gives a more generic (and caching) interface. But kmap_atomic can - * be used in IRQ contexts, so in some (very limited) cases we need - * it. + * For highmem systems it is required to temporarily map pages + * which reside in the portion of memory which is not covered + * by the permanent kernel mapping. + * + * This comes in three flavors: + * + * 1) kmap/kunmap: + * + * An interface to acquire longer term mappings with no restrictions + * on preemption and migration. This comes with an overhead as the + * mapping space is restricted and protected by a global lock. It + * also requires global TLB invalidation when the kmap pool wraps. + * + * kmap() might block when the mapping space is fully utilized until a + * slot becomes available. Only callable from preemptible thread + * context. + * + * 2) kmap_local.*()/kunmap_local.*() + * + * An interface to acquire short term mappings. Can be invoked from any + * context including interrupts. The mapping is per thread, CPU local + * and not globaly visible. It can only be used in the context which + * acquried the mapping. Nesting kmap_local.*() and kmap_atomic.*() + * mappings is allowed to a certain extent (up to KMAP_TYPE_NR). + * + * Nested kmap_local.*() and kunmap_local.*() invocations have to be + * strictly ordered because the map implementation is stack based. + * + * kmap_local.*() disables migration, but keeps preemption enabled. It's + * valid to take pagefaults in a kmap_local region unless the context in + * which the local kmap is acquired does not allow it for other reasons. + * + * If a task holding local kmaps is preempted, the maps are removed on + * context switch and restored when the task comes back on the CPU. As + * the maps are strictly CPU local it is guaranteed that the task stays + * on the CPU and the CPU cannot be unplugged until the local kmaps are + * released. + * + * 3) kmap_atomic.*()/kunmap_atomic.*() + * + * Based on the same mechanism as kmap local. Atomic kmap disables + * preemption and pagefaults. Only use if absolutely required, use + * the corresponding kmap_local variant if possible. + * + * Local and atomic kmaps are faster than kmap/kunmap, but impose + * restrictions. Only use them when required. + * + * For !HIGHMEM enabled systems the kmap flavours are not doing any mapping + * operation and kmap() won't sleep, but the kmap local and atomic variants + * still disable migration resp. pagefaults and preemption. */ static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot) { @@ -122,6 +161,28 @@ static inline void __kunmap_atomic(void kunmap_local_indexed(addr); } +static inline void *kmap_local_page_prot(struct page *page, pgprot_t prot) +{ + migrate_disable(); + return __kmap_local_page_prot(page, prot); +} + +static inline void *kmap_local_page(struct page *page) +{ + return kmap_local_page_prot(page, kmap_prot); +} + +static inline void *kmap_local_pfn(unsigned long pfn) +{ + migrate_disable(); + return __kmap_local_pfn_prot(pfn, kmap_prot); +} + +static inline void __kunmap_local(void *vaddr) +{ + kunmap_local_indexed(vaddr); +} + /* declarations for linux/mm/highmem.c */ unsigned int nr_free_highpages(void); extern atomic_long_t _totalhigh_pages; @@ -201,10 +262,27 @@ static inline void *kmap_atomic_pfn(unsi static inline void __kunmap_atomic(void *addr) { - /* - * Mostly nothing to do in the CONFIG_HIGHMEM=n case as kunmap_atomic() - * handles re-enabling faults and preemption - */ + __kunmap_local(addr); +} + +static inline void *kmap_local_page(struct page *page) +{ + migrate_disable(); + return page_address(page); +} + +static inline void *kmap_local_page_prot(struct page *page, pgprot_t prot) +{ + return kmap_local_page(page); +} + +static inline void *kmap_local_pfn(unsigned long pfn) +{ + return kmap_local_page(pfn_to_page(pfn)); +} + +static inline void __kunmap_local(void *addr) +{ #ifdef ARCH_HAS_FLUSH_ON_KUNMAP kunmap_flush_on_unmap(addr); #endif @@ -226,6 +304,13 @@ do { \ preempt_enable(); \ } while (0) +#define kunmap_local(__addr) \ +do { \ + BUILD_BUG_ON(__same_type((__addr), struct page *)); \ + __kunmap_local(__addr); \ + migrate_enable(); \ +} while (0) + /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ #ifndef clear_user_highpage static inline void clear_user_highpage(struct page *page, unsigned long vaddr) From patchwork Thu Oct 29 22:18:24 2020 Content-Type: text/plain; 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bh=bMLYR+ULvXX0256D4Df+wpxshaXLT7cqrLUawfmTX9Q=; b=STUDCvqBTgV5xXrnXgKMETTb5aOCokIJFCvgDEer9TTJtzFGrKJQw3D5iibPwOcWdvspr/ F17h1AXIu/YLuvCg== Date: Thu, 29 Oct 2020 23:18:24 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Andrew Morton , linux-mm@kvack.org, x86@kernel.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Guo Ren , 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 Subject: [patch V2 18/18] io-mapping: Provide iomap_local variant References: <20201029221806.189523375@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: Similar to kmap local provide a iomap local variant which only disables migration, but neither disables pagefaults nor preemption. Signed-off-by: Thomas Gleixner --- V2: Split out from the large combo patch and add the !IOMAP_ATOMIC variants --- include/linux/io-mapping.h | 34 ++++++++++++++++++++++++++++++++-- 1 file changed, 32 insertions(+), 2 deletions(-) --- a/include/linux/io-mapping.h +++ b/include/linux/io-mapping.h @@ -83,6 +83,23 @@ io_mapping_unmap_atomic(void __iomem *va } static inline void __iomem * +io_mapping_map_local_wc(struct io_mapping *mapping, unsigned long offset) +{ + resource_size_t phys_addr; + + BUG_ON(offset >= mapping->size); + phys_addr = mapping->base + offset; + migrate_disable(); + return __iomap_local_pfn_prot(PHYS_PFN(phys_addr), mapping->prot); +} + +static inline void io_mapping_unmap_local(void __iomem *vaddr) +{ + kunmap_local_indexed((void __force *)vaddr); + migrate_enable(); +} + +static inline void __iomem * io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset, unsigned long size) @@ -101,7 +118,7 @@ io_mapping_unmap(void __iomem *vaddr) iounmap(vaddr); } -#else +#else /* HAVE_ATOMIC_IOMAP */ #include @@ -166,7 +183,20 @@ io_mapping_unmap_atomic(void __iomem *va preempt_enable(); } -#endif /* HAVE_ATOMIC_IOMAP */ +static inline void __iomem * +io_mapping_map_local_wc(struct io_mapping *mapping, unsigned long offset) +{ + migrate_disable(); + return io_mapping_map_wc(mapping, offset, PAGE_SIZE); +} + +static inline void io_mapping_unmap_local(void __iomem *vaddr) +{ + io_mapping_unmap(vaddr); + migrate_enable(); +} + +#endif /* !HAVE_ATOMIC_IOMAP */ static inline struct io_mapping * io_mapping_create_wc(resource_size_t base,