From: Greentime Hu <greentime@xxxxxxxxxxxxx> This patch contains cache and TLB maintenance functions. Signed-off-by: Vincent Chen <vincentc@xxxxxxxxxxxxx> Signed-off-by: Greentime Hu <greentime@xxxxxxxxxxxxx> --- arch/nds32/include/asm/cache.h | 25 ++ arch/nds32/include/asm/cache_info.h | 26 ++ arch/nds32/include/asm/cacheflush.h | 57 ++++ arch/nds32/include/asm/mmu_context.h | 81 +++++ arch/nds32/include/asm/proc-fns.h | 57 ++++ arch/nds32/include/asm/tlb.h | 41 +++ arch/nds32/include/asm/tlbflush.h | 60 ++++ arch/nds32/include/uapi/asm/cachectl.h | 19 ++ arch/nds32/kernel/cacheinfo.c | 62 ++++ arch/nds32/mm/cacheflush.c | 331 ++++++++++++++++++++ arch/nds32/mm/proc.c | 527 ++++++++++++++++++++++++++++++++ arch/nds32/mm/tlb.c | 63 ++++ 12 files changed, 1349 insertions(+) create mode 100644 arch/nds32/include/asm/cache.h create mode 100644 arch/nds32/include/asm/cache_info.h create mode 100644 arch/nds32/include/asm/cacheflush.h create mode 100644 arch/nds32/include/asm/mmu_context.h create mode 100644 arch/nds32/include/asm/proc-fns.h create mode 100644 arch/nds32/include/asm/tlb.h create mode 100644 arch/nds32/include/asm/tlbflush.h create mode 100644 arch/nds32/include/uapi/asm/cachectl.h create mode 100644 arch/nds32/kernel/cacheinfo.c create mode 100644 arch/nds32/mm/cacheflush.c create mode 100644 arch/nds32/mm/proc.c create mode 100644 arch/nds32/mm/tlb.c diff --git a/arch/nds32/include/asm/cache.h b/arch/nds32/include/asm/cache.h new file mode 100644 index 0000000..36ec549 --- /dev/null +++ b/arch/nds32/include/asm/cache.h @@ -0,0 +1,25 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __NDS32_CACHE_H__ +#define __NDS32_CACHE_H__ + +#define L1_CACHE_BYTES 32 +#define L1_CACHE_SHIFT 5 + +#define ARCH_DMA_MINALIGN L1_CACHE_BYTES + +#endif /* __NDS32_CACHE_H__ */ diff --git a/arch/nds32/include/asm/cache_info.h b/arch/nds32/include/asm/cache_info.h new file mode 100644 index 0000000..2b17b7d --- /dev/null +++ b/arch/nds32/include/asm/cache_info.h @@ -0,0 +1,26 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +struct cache_info { + unsigned char ways; + unsigned char line_size; + unsigned short sets; + unsigned short size; +#if defined(CONFIG_CPU_CACHE_ALIASING) + unsigned short aliasing_num; + unsigned int aliasing_mask; +#endif +}; diff --git a/arch/nds32/include/asm/cacheflush.h b/arch/nds32/include/asm/cacheflush.h new file mode 100644 index 0000000..5b95a6c --- /dev/null +++ b/arch/nds32/include/asm/cacheflush.h @@ -0,0 +1,57 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __NDS32_CACHEFLUSH_H__ +#define __NDS32_CACHEFLUSH_H__ + +#include <linux/mm.h> + +#define PG_dcache_dirty PG_arch_1 + +#ifdef CONFIG_CPU_CACHE_ALIASING +void flush_cache_mm(struct mm_struct *mm); +void flush_cache_dup_mm(struct mm_struct *mm); +void flush_cache_range(struct vm_area_struct *vma, + unsigned long start, unsigned long end); +void flush_cache_page(struct vm_area_struct *vma, + unsigned long addr, unsigned long pfn); +void flush_cache_kmaps(void); +void flush_cache_vmap(unsigned long start, unsigned long end); +void flush_cache_vunmap(unsigned long start, unsigned long end); + +#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1 +void flush_dcache_page(struct page *page); +void copy_to_user_page(struct vm_area_struct *vma, struct page *page, + unsigned long vaddr, void *dst, void *src, int len); +void copy_from_user_page(struct vm_area_struct *vma, struct page *page, + unsigned long vaddr, void *dst, void *src, int len); + +#define ARCH_HAS_FLUSH_ANON_PAGE +void flush_anon_page(struct vm_area_struct *vma, + struct page *page, unsigned long vaddr); + +#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE +void flush_kernel_dcache_page(struct page *page); +void flush_icache_range(unsigned long start, unsigned long end); +void flush_icache_page(struct vm_area_struct *vma, struct page *page); +#define flush_dcache_mmap_lock(mapping) spin_lock_irq(&(mapping)->tree_lock) +#define flush_dcache_mmap_unlock(mapping) spin_unlock_irq(&(mapping)->tree_lock) + +#else +#include <asm-generic/cacheflush.h> +#endif + +#endif /* __NDS32_CACHEFLUSH_H__ */ diff --git a/arch/nds32/include/asm/mmu_context.h b/arch/nds32/include/asm/mmu_context.h new file mode 100644 index 0000000..4a59b5d --- /dev/null +++ b/arch/nds32/include/asm/mmu_context.h @@ -0,0 +1,81 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __ASM_NDS32_MMU_CONTEXT_H +#define __ASM_NDS32_MMU_CONTEXT_H + +#include <linux/spinlock.h> +#include <asm/tlbflush.h> +#include <asm/proc-fns.h> +#include <asm-generic/mm_hooks.h> + +static inline int +init_new_context(struct task_struct *tsk, struct mm_struct *mm) +{ + mm->context.id = 0; + return 0; +} + +#define destroy_context(mm) do { } while(0) + +#define CID_BITS 9 +extern spinlock_t cid_lock; +extern unsigned int cpu_last_cid; + +static inline void __new_context(struct mm_struct *mm) +{ + unsigned int cid; + unsigned long flags; + + spin_lock_irqsave(&cid_lock, flags); + cid = cpu_last_cid; + cpu_last_cid += 1 << TLB_MISC_offCID; + if (cpu_last_cid == 0) + cpu_last_cid = 1 << TLB_MISC_offCID << CID_BITS; + + if ((cid & TLB_MISC_mskCID) == 0) + flush_tlb_all(); + spin_unlock_irqrestore(&cid_lock, flags); + + mm->context.id = cid; +} + +static inline void check_context(struct mm_struct *mm) +{ + if (unlikely + ((mm->context.id ^ cpu_last_cid) >> TLB_MISC_offCID >> CID_BITS)) + __new_context(mm); +} + +static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) +{ +} + +static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, + struct task_struct *tsk) +{ + unsigned int cpu = smp_processor_id(); + + if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next)) || prev != next) { + check_context(next); + cpu_switch_mm(next); + } +} + +#define deactivate_mm(tsk,mm) do { } while (0) +#define activate_mm(prev,next) switch_mm(prev, next, NULL) + +#endif diff --git a/arch/nds32/include/asm/proc-fns.h b/arch/nds32/include/asm/proc-fns.h new file mode 100644 index 0000000..b1a56d2 --- /dev/null +++ b/arch/nds32/include/asm/proc-fns.h @@ -0,0 +1,57 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __NDS32_PROCFNS_H__ +#define __NDS32_PROCFNS_H__ + +#ifdef __KERNEL__ +#include <asm/page.h> + +struct mm_struct; +struct vm_area_struct; +extern void cpu_proc_init(void); +extern void cpu_proc_fin(void); +extern void cpu_do_idle(void); +extern void cpu_reset(unsigned long reset); +extern void cpu_switch_mm(struct mm_struct *mm); + +extern void cpu_dcache_inval_all(void); +extern void cpu_dcache_wbinval_all(void); +extern void cpu_dcache_inval_page(unsigned long page); +extern void cpu_dcache_wb_page(unsigned long page); +extern void cpu_dcache_wbinval_page(unsigned long page); +extern void cpu_dcache_inval_range(unsigned long start, unsigned long end); +extern void cpu_dcache_wb_range(unsigned long start, unsigned long end); +extern void cpu_dcache_wbinval_range(unsigned long start, unsigned long end); + +extern void cpu_icache_inval_all(void); +extern void cpu_icache_inval_page(unsigned long page); +extern void cpu_icache_inval_range(unsigned long start, unsigned long end); + +extern void cpu_cache_wbinval_page(unsigned long page, int flushi); +extern void cpu_cache_wbinval_range(unsigned long start, + unsigned long end, int flushi); +extern void cpu_cache_wbinval_range_check(struct vm_area_struct *vma, + unsigned long start, + unsigned long end, bool flushi, + bool wbd); + +extern void cpu_dma_wb_range(unsigned long start, unsigned long end); +extern void cpu_dma_inval_range(unsigned long start, unsigned long end); +extern void cpu_dma_wbinval_range(unsigned long start, unsigned long end); + +#endif /* __KERNEL__ */ +#endif /* __NDS32_PROCFNS_H__ */ diff --git a/arch/nds32/include/asm/tlb.h b/arch/nds32/include/asm/tlb.h new file mode 100644 index 0000000..c599827 --- /dev/null +++ b/arch/nds32/include/asm/tlb.h @@ -0,0 +1,41 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __ASMNDS32_TLB_H +#define __ASMNDS32_TLB_H + +#define tlb_start_vma(tlb,vma) \ + do { \ + if (!tlb->fullmm) \ + flush_cache_range(vma, vma->vm_start, vma->vm_end); \ + } while (0) + +#define tlb_end_vma(tlb,vma) \ + do { \ + if(!tlb->fullmm) \ + flush_tlb_range(vma, vma->vm_start, vma->vm_end); \ + } while (0) + +#define __tlb_remove_tlb_entry(tlb, pte, addr) do { } while (0) + +#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm) + +#include <asm-generic/tlb.h> + +#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte) +#define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tln)->mm, pmd) + +#endif diff --git a/arch/nds32/include/asm/tlbflush.h b/arch/nds32/include/asm/tlbflush.h new file mode 100644 index 0000000..680aeb3 --- /dev/null +++ b/arch/nds32/include/asm/tlbflush.h @@ -0,0 +1,60 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef _ASMNDS32_TLBFLUSH_H +#define _ASMNDS32_TLBFLUSH_H + +#include <linux/spinlock.h> +#include <linux/mm.h> +#include <nds32_intrinsic.h> + +static inline void local_flush_tlb_all(void) +{ + __nds32__tlbop_flua(); + __nds32__isb(); +} + +static inline void local_flush_tlb_mm(struct mm_struct *mm) +{ + __nds32__tlbop_flua(); + __nds32__isb(); +} + +static inline void local_flush_tlb_kernel_range(unsigned long start, + unsigned long end) +{ + while (start < end) { + __nds32__tlbop_inv(start); + __nds32__isb(); + start += PAGE_SIZE; + } +} + +void local_flush_tlb_range(struct vm_area_struct *vma, + unsigned long start, unsigned long end); +void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long addr); + +#define flush_tlb_all local_flush_tlb_all +#define flush_tlb_mm local_flush_tlb_mm +#define flush_tlb_range local_flush_tlb_range +#define flush_tlb_page local_flush_tlb_page +#define flush_tlb_kernel_range local_flush_tlb_kernel_range + +void update_mmu_cache(struct vm_area_struct *vma, + unsigned long address, pte_t * pte); +void tlb_migrate_finish(struct mm_struct *mm); + +#endif diff --git a/arch/nds32/include/uapi/asm/cachectl.h b/arch/nds32/include/uapi/asm/cachectl.h new file mode 100644 index 0000000..a56a37d --- /dev/null +++ b/arch/nds32/include/uapi/asm/cachectl.h @@ -0,0 +1,19 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1994, 1995, 1996 by Ralf Baechle + * Copyright (C) 2005-2017 Andes Technology Corporation + */ +#ifndef _ASM_CACHECTL +#define _ASM_CACHECTL + +/* + * Options for cacheflush system call + */ +#define ICACHE 0 /* flush instruction cache */ +#define DCACHE 1 /* writeback and flush data cache */ +#define BCACHE 2 /* flush instruction cache + writeback and flush data cache */ + +#endif /* _ASM_CACHECTL */ diff --git a/arch/nds32/kernel/cacheinfo.c b/arch/nds32/kernel/cacheinfo.c new file mode 100644 index 0000000..edc0fda --- /dev/null +++ b/arch/nds32/kernel/cacheinfo.c @@ -0,0 +1,62 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/bitops.h> +#include <linux/cacheinfo.h> +#include <linux/cpu.h> + +static void ci_leaf_init(struct cacheinfo *this_leaf, + enum cache_type type, unsigned int level) +{ + char cache_type = (type & CACHE_TYPE_INST ? ICACHE : DCACHE); + + this_leaf->level = level; + this_leaf->type = type; + this_leaf->coherency_line_size = CACHE_LINE_SIZE(cache_type); + this_leaf->number_of_sets = CACHE_SET(cache_type);; + this_leaf->ways_of_associativity = CACHE_WAY(cache_type); + this_leaf->size = this_leaf->number_of_sets * + this_leaf->coherency_line_size * this_leaf->ways_of_associativity; +#if defined(CONFIG_CPU_DCACHE_WRITETHROUGH) + this_leaf->attributes = CACHE_WRITE_THROUGH; +#else + this_leaf->attributes = CACHE_WRITE_BACK; +#endif +} + +int init_cache_level(unsigned int cpu) +{ + struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); + + /* Only 1 level and I/D cache seperate. */ + this_cpu_ci->num_levels = 1; + this_cpu_ci->num_leaves = 2; + return 0; +} + +int populate_cache_leaves(unsigned int cpu) +{ + unsigned int level, idx; + struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); + struct cacheinfo *this_leaf = this_cpu_ci->info_list; + + for (idx = 0, level = 1; level <= this_cpu_ci->num_levels && + idx < this_cpu_ci->num_leaves; idx++, level++) { + ci_leaf_init(this_leaf++, CACHE_TYPE_DATA, level); + ci_leaf_init(this_leaf++, CACHE_TYPE_INST, level); + } + return 0; +} diff --git a/arch/nds32/mm/cacheflush.c b/arch/nds32/mm/cacheflush.c new file mode 100644 index 0000000..69a85f7 --- /dev/null +++ b/arch/nds32/mm/cacheflush.c @@ -0,0 +1,331 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/mm.h> +#include <linux/sched.h> +#include <linux/fs.h> +#include <linux/pagemap.h> +#include <linux/module.h> +#include <asm/cacheflush.h> +#include <asm/proc-fns.h> +#include <asm/shmparam.h> +#include <asm/cache_info.h> + +extern struct cache_info L1_cache_info[2]; + +#ifndef CONFIG_CPU_CACHE_ALIASING +void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, + pte_t * pte) +{ + struct page *page; + unsigned long pfn = pte_pfn(*pte); + + if (!pfn_valid(pfn)) + return; + + if (vma->vm_mm == current->active_mm) { + + __nds32__mtsr_dsb(addr, NDS32_SR_TLB_VPN); + __nds32__tlbop_rwr(*pte); + __nds32__isb(); + } + page = pfn_to_page(pfn); + + if ((test_and_clear_bit(PG_dcache_dirty, &page->flags)) || + (vma->vm_flags & VM_EXEC)) { + + if (!PageHighMem(page)) { + cpu_cache_wbinval_page((unsigned long) + page_address(page), + vma->vm_flags & VM_EXEC); + } else { + unsigned long kaddr = (unsigned long)kmap_atomic(page); + cpu_cache_wbinval_page(kaddr, vma->vm_flags & VM_EXEC); + kunmap_atomic((void *)kaddr); + } + } +} +#else +extern pte_t va_present(struct mm_struct *mm, unsigned long addr); + +static inline unsigned long aliasing(unsigned long addr, unsigned long page) +{ + return ((addr & PAGE_MASK) ^ page) & (SHMLBA - 1); +} + +static inline unsigned long kremap0(unsigned long uaddr, unsigned long pa) +{ + unsigned long kaddr, pte; + +#define BASE_ADDR0 0xffffc000 + kaddr = BASE_ADDR0 | (uaddr & L1_cache_info[DCACHE].aliasing_mask); + pte = (pa | PAGE_KERNEL); + __nds32__mtsr_dsb(kaddr, NDS32_SR_TLB_VPN); + __nds32__tlbop_rwlk(pte); + __nds32__isb(); + return kaddr; +} + +static inline void kunmap01(unsigned long kaddr) +{ + __nds32__tlbop_unlk(kaddr); + __nds32__tlbop_inv(kaddr); + __nds32__isb(); +} + +static inline unsigned long kremap1(unsigned long uaddr, unsigned long pa) +{ + unsigned long kaddr, pte; + +#define BASE_ADDR1 0xffff8000 + kaddr = BASE_ADDR1 | (uaddr & L1_cache_info[DCACHE].aliasing_mask); + pte = (pa | PAGE_KERNEL); + __nds32__mtsr_dsb(kaddr, NDS32_SR_TLB_VPN); + __nds32__tlbop_rwlk(pte); + __nds32__isb(); + return kaddr; +} + +void flush_cache_mm(struct mm_struct *mm) +{ + unsigned long flags; + + local_irq_save(flags); + cpu_dcache_wbinval_all(); + cpu_icache_inval_all(); + local_irq_restore(flags); +} + +void flush_cache_dup_mm(struct mm_struct *mm) +{ +} + +void flush_cache_range(struct vm_area_struct *vma, + unsigned long start, unsigned long end) +{ + unsigned long flags; + + if ((end - start) > 8 * PAGE_SIZE) { + cpu_dcache_wbinval_all(); + if (vma->vm_flags & VM_EXEC) + cpu_icache_inval_all(); + return; + } + local_irq_save(flags); + while (start < end) { + if (va_present(vma->vm_mm, start)) + cpu_cache_wbinval_page(start, vma->vm_flags & VM_EXEC); + start += PAGE_SIZE; + } + local_irq_restore(flags); + return; +} + +void flush_cache_page(struct vm_area_struct *vma, + unsigned long addr, unsigned long pfn) +{ + unsigned long vto, flags; + + local_irq_save(flags); + vto = kremap0(addr, pfn << PAGE_SHIFT); + cpu_cache_wbinval_page(vto, vma->vm_flags & VM_EXEC); + kunmap01(vto); + local_irq_restore(flags); +} + +void flush_cache_vmap(unsigned long start, unsigned long end) +{ + cpu_dcache_wbinval_all(); + cpu_icache_inval_all(); +} + +void flush_cache_vunmap(unsigned long start, unsigned long end) +{ + cpu_dcache_wbinval_all(); + cpu_icache_inval_all(); +} + +void copy_user_highpage(struct page *to, struct page *from, + unsigned long vaddr, struct vm_area_struct *vma) +{ + unsigned long vto, vfrom, flags, kto, kfrom, pfrom, pto; + kto = ((unsigned long)page_address(to) & PAGE_MASK); + kfrom = ((unsigned long)page_address(from) & PAGE_MASK); + pto = page_to_phys(to); + pfrom = page_to_phys(from); + + if (aliasing(vaddr, (unsigned long)kfrom)) + cpu_dcache_wb_page((unsigned long)kfrom); + if (aliasing(vaddr, (unsigned long)kto)) + cpu_dcache_inval_page((unsigned long)kto); + local_irq_save(flags); + vto = kremap0(vaddr, pto); + vfrom = kremap1(vaddr, pfrom); + copy_page((void *)vto, (void *)vfrom); + kunmap01(vfrom); + kunmap01(vto); + local_irq_restore(flags); +} + +EXPORT_SYMBOL(copy_user_highpage); + +void clear_user_highpage(struct page *page, unsigned long vaddr) +{ + unsigned long vto, flags, kto; + + kto = ((unsigned long)page_address(page) & PAGE_MASK); + + local_irq_save(flags); + if (aliasing(kto, vaddr) && kto != 0) { + cpu_dcache_inval_page(kto); + cpu_icache_inval_page(kto); + } + vto = kremap0(vaddr, page_to_phys(page)); + clear_page((void *)vto); + kunmap01(vto); + local_irq_restore(flags); +} + +EXPORT_SYMBOL(clear_user_highpage); + +void flush_dcache_page(struct page *page) +{ + struct address_space *mapping; + + mapping = page_mapping(page); + if (mapping && !mapping_mapped(mapping)) + set_bit(PG_dcache_dirty, &page->flags); + else { + int i, pc; + unsigned long vto, kaddr, flags; + kaddr = (unsigned long)page_address(page); + cpu_dcache_wbinval_page(kaddr); + pc = CACHE_SET(DCACHE) * CACHE_LINE_SIZE(DCACHE) / PAGE_SIZE; + local_irq_save(flags); + for (i = 0; i < pc; i++) { + vto = + kremap0(kaddr + i * PAGE_SIZE, page_to_phys(page)); + cpu_dcache_wbinval_page(vto); + kunmap01(vto); + } + local_irq_restore(flags); + } +} + +void copy_to_user_page(struct vm_area_struct *vma, struct page *page, + unsigned long vaddr, void *dst, void *src, int len) +{ + unsigned long line_size, start, end, vto, flags; + + local_irq_save(flags); + vto = kremap0(vaddr, page_to_phys(page)); + dst = (void *)(vto | (vaddr & (PAGE_SIZE - 1))); + memcpy(dst, src, len); + if (vma->vm_flags & VM_EXEC) { + line_size = L1_cache_info[DCACHE].line_size; + start = (unsigned long)dst & ~(line_size - 1); + end = + ((unsigned long)dst + len + line_size - 1) & ~(line_size - + 1); + cpu_cache_wbinval_range(start, end, 1); + } + kunmap01(vto); + local_irq_restore(flags); +} + +void copy_from_user_page(struct vm_area_struct *vma, struct page *page, + unsigned long vaddr, void *dst, void *src, int len) +{ + unsigned long vto, flags; + + local_irq_save(flags); + vto = kremap0(vaddr, page_to_phys(page)); + src = (void *)(vto | (vaddr & (PAGE_SIZE - 1))); + memcpy(dst, src, len); + kunmap01(vto); + local_irq_restore(flags); +} + +void flush_anon_page(struct vm_area_struct *vma, + struct page *page, unsigned long vaddr) +{ + unsigned long flags; + if (!PageAnon(page)) + return; + + if (vma->vm_mm != current->active_mm) + return; + + local_irq_save(flags); + if (vma->vm_flags & VM_EXEC) + cpu_icache_inval_page(vaddr & PAGE_MASK); + cpu_dcache_wbinval_page((unsigned long)page_address(page)); + local_irq_restore(flags); +} + +void flush_kernel_dcache_page(struct page *page) +{ + unsigned long flags; + local_irq_save(flags); + cpu_dcache_wbinval_page((unsigned long)page_address(page)); + local_irq_restore(flags); +} + +void flush_icache_range(unsigned long start, unsigned long end) +{ + unsigned long line_size, flags; + line_size = L1_cache_info[DCACHE].line_size; + start = start & ~(line_size - 1); + end = (end + line_size - 1) & ~(line_size - 1); + local_irq_save(flags); + cpu_cache_wbinval_range(start, end, 1); + local_irq_restore(flags); +} + +void flush_icache_page(struct vm_area_struct *vma, struct page *page) +{ + unsigned long flags; + local_irq_save(flags); + cpu_cache_wbinval_page((unsigned long)page_address(page), + vma->vm_flags & VM_EXEC); + local_irq_restore(flags); +} + +void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, + pte_t * pte) +{ + struct page *page; + unsigned long flags; + unsigned long pfn = pte_pfn(*pte); + + if (!pfn_valid(pfn)) + return; + + if (vma->vm_mm == current->active_mm) { + __nds32__mtsr_dsb(addr, NDS32_SR_TLB_VPN); + __nds32__tlbop_rwr(*pte); + __nds32__isb(); + } + + page = pfn_to_page(pfn); + if (test_and_clear_bit(PG_dcache_dirty, &page->flags) || + (vma->vm_flags & VM_EXEC)) { + local_irq_save(flags); + cpu_dcache_wbinval_page((unsigned long)page_address(page)); + local_irq_restore(flags); + } +} +#endif diff --git a/arch/nds32/mm/proc.c b/arch/nds32/mm/proc.c new file mode 100644 index 0000000..b78c25a --- /dev/null +++ b/arch/nds32/mm/proc.c @@ -0,0 +1,527 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <asm/nds32.h> +#include <asm/pgtable.h> +#include <asm/tlbflush.h> +#include <asm/cacheflush.h> +#include <asm/l2_cache.h> +#include <nds32_intrinsic.h> + +#include <asm/cache_info.h> +extern struct cache_info L1_cache_info[2]; + +int va_kernel_present(unsigned long addr) +{ + pmd_t *pmd; + pte_t *ptep, pte; + + pmd = pmd_offset(pgd_offset_k(addr), addr); + if (!pmd_none(*pmd)) { + ptep = pte_offset_map(pmd, addr); + pte = *ptep; + if (pte_present(pte)) + return pte; + } + return 0; +} + +pte_t va_present(struct mm_struct * mm, unsigned long addr) +{ + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + pte_t *ptep, pte; + + pgd = pgd_offset(mm, addr); + if (!pgd_none(*pgd)) { + pud = pud_offset(pgd, addr); + if (!pud_none(*pud)) { + pmd = pmd_offset(pud, addr); + if (!pmd_none(*pmd)) { + ptep = pte_offset_map(pmd, addr); + pte = *ptep; + if (pte_present(pte)) + return pte; + } + } + } + return 0; + +} + +int va_readable(struct pt_regs *regs, unsigned long addr) +{ + struct mm_struct *mm = current->mm; + pte_t pte; + int ret = 0; + + if (user_mode(regs)) { + /* user mode */ + pte = va_present(mm, addr); + if (!pte && pte_read(pte)) + ret = 1; + } else { + /* superuser mode is always readable, so we can only + * check it is present or not*/ + return (! !va_kernel_present(addr)); + } + return ret; +} + +int va_writable(struct pt_regs *regs, unsigned long addr) +{ + struct mm_struct *mm = current->mm; + pte_t pte; + int ret = 0; + + if (user_mode(regs)) { + /* user mode */ + pte = va_present(mm, addr); + if (!pte && pte_write(pte)) + ret = 1; + } else { + /* superuser mode */ + pte = va_kernel_present(addr); + if (!pte && pte_kernel_write(pte)) + ret = 1; + } + return ret; +} + +/* + * All + */ +void cpu_icache_inval_all(void) +{ + unsigned long end, line_size; + + line_size = L1_cache_info[ICACHE].line_size; + end = + line_size * L1_cache_info[ICACHE].ways * L1_cache_info[ICACHE].sets; + + do { + end -= line_size; + __asm__ volatile ("\n\tcctl %0, L1I_IX_INVAL"::"r" (end)); + end -= line_size; + __asm__ volatile ("\n\tcctl %0, L1I_IX_INVAL"::"r" (end)); + end -= line_size; + __asm__ volatile ("\n\tcctl %0, L1I_IX_INVAL"::"r" (end)); + end -= line_size; + __asm__ volatile ("\n\tcctl %0, L1I_IX_INVAL"::"r" (end)); + } while (end > 0); +} + +void cpu_dcache_inval_all(void) +{ + __nds32__cctl_l1d_invalall(); + __nds32__msync_all(); +} + +void cpu_dcache_wb_all(void) +{ +#ifdef CONFIG_CACHE_L2 + if (atl2c_base) + __nds32__cctl_l1d_wball_alvl(); + else + __nds32__cctl_l1d_wball_one_lvl(); +#else + __nds32__cctl_l1d_wball_one_lvl(); +#endif + __nds32__msync_all(); +} + +void cpu_dcache_wbinval_all(void) +{ +#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH + unsigned long flags; + local_irq_save(flags); +#endif + cpu_dcache_wb_all(); + cpu_dcache_inval_all(); +#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH + local_irq_restore(flags); +#endif +} + +/* + * Page + */ +void cpu_icache_inval_page(unsigned long start) +{ + unsigned long line_size, end; + + line_size = L1_cache_info[ICACHE].line_size; + end = start + PAGE_SIZE; + + do { + end -= line_size; + __asm__ volatile ("\n\tcctl %0, L1I_VA_INVAL"::"r" (end)); + end -= line_size; + __asm__ volatile ("\n\tcctl %0, L1I_VA_INVAL"::"r" (end)); + end -= line_size; + __asm__ volatile ("\n\tcctl %0, L1I_VA_INVAL"::"r" (end)); + end -= line_size; + __asm__ volatile ("\n\tcctl %0, L1I_VA_INVAL"::"r" (end)); + } while (end != start); +} + +void cpu_dcache_inval_page(unsigned long start) +{ + unsigned long line_size, end; + + line_size = L1_cache_info[DCACHE].line_size; + end = start + PAGE_SIZE; + + do { + end -= line_size; + __asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (end)); + end -= line_size; + __asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (end)); + end -= line_size; + __asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (end)); + end -= line_size; + __asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (end)); + } while (end != start); + __nds32__msync_all(); +} + +void cpu_dcache_wb_page(unsigned long start) +{ +#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH + unsigned long line_size, end; + + line_size = L1_cache_info[DCACHE].line_size; + end = start + PAGE_SIZE; + + do { + end -= line_size; + __asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (end)); + end -= line_size; + __asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (end)); + end -= line_size; + __asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (end)); + end -= line_size; + __asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (end)); + } while (end != start); + __nds32__msync_all(); +#endif +} + +void cpu_dcache_wbinval_page(unsigned long start) +{ + unsigned long line_size, end; + + line_size = L1_cache_info[DCACHE].line_size; + end = start + PAGE_SIZE; + + do { + end -= line_size; +#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH + __asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (end)); +#endif + __asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (end)); + end -= line_size; +#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH + __asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (end)); +#endif + __asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (end)); + end -= line_size; +#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH + __asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (end)); +#endif + __asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (end)); + end -= line_size; +#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH + __asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (end)); +#endif + __asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (end)); + } while (end != start); + __nds32__msync_all(); +} + +void cpu_cache_wbinval_page(unsigned long page, int flushi) +{ + cpu_dcache_wbinval_page(page); + if (flushi) + cpu_icache_inval_page(page); +} + +/* + * Range + */ +void cpu_icache_inval_range(unsigned long start, unsigned long end) +{ + unsigned long line_size; + + line_size = L1_cache_info[ICACHE].line_size; + + while (end > start) { + __asm__ volatile ("\n\tcctl %0, L1I_VA_INVAL"::"r" (start)); + start += line_size; + } +} + +void cpu_dcache_inval_range(unsigned long start, unsigned long end) +{ + unsigned long line_size; + + line_size = L1_cache_info[DCACHE].line_size; + + while (end > start) { + __asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (start)); + start += line_size; + } + __nds32__msync_all(); +} + +void cpu_dcache_wb_range(unsigned long start, unsigned long end) +{ +#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH + unsigned long line_size; + + line_size = L1_cache_info[DCACHE].line_size; + + while (end > start) { + __asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (start)); + start += line_size; + } + __nds32__msync_all(); +#endif +} + +void cpu_dcache_wbinval_range(unsigned long start, unsigned long end) +{ + unsigned long line_size; + + line_size = L1_cache_info[DCACHE].line_size; + + while (end > start) { +#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH + __asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (start)); +#endif + __asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (start)); + start += line_size; + } + __nds32__msync_all(); +} + +void cpu_cache_wbinval_range(unsigned long start, unsigned long end, int flushi) +{ + unsigned long line_size, align_start, align_end; + + line_size = L1_cache_info[DCACHE].line_size; + align_start = start & ~(line_size - 1); + align_end = (end + line_size - 1) & ~(line_size - 1); + cpu_dcache_wbinval_range(align_start, align_end); + + if (flushi) { + line_size = L1_cache_info[ICACHE].line_size; + align_start = start & ~(line_size - 1); + align_end = (end + line_size - 1) & ~(line_size - 1); + cpu_icache_inval_range(align_start, align_end); + } +} + +void cpu_cache_wbinval_range_check(struct vm_area_struct *vma, + unsigned long start, unsigned long end, + bool flushi, bool wbd) +{ + unsigned long line_size, t_start, t_end; + + if (!flushi && !wbd) + return; + line_size = L1_cache_info[DCACHE].line_size; + start = start & ~(line_size - 1); + end = (end + line_size - 1) & ~(line_size - 1); + + if ((end - start) > (8 * PAGE_SIZE)) { + if (wbd) + cpu_dcache_wbinval_all(); + if (flushi) + cpu_icache_inval_all(); + __nds32__msync_all(); + return; + } + + t_start = (start + PAGE_SIZE) & PAGE_MASK; + t_end = ((end - 1) & PAGE_MASK); + + if ((start & PAGE_MASK) == t_end) { + if (va_present(vma->vm_mm, start)) { + if (wbd) + cpu_dcache_wbinval_range(start, end); + if (flushi) + cpu_icache_inval_range(start, end); + } + __nds32__msync_all(); + return; + } + + if (va_present(vma->vm_mm, start)) { + if (wbd) + cpu_dcache_wbinval_range(start, t_start); + if (flushi) + cpu_icache_inval_range(start, t_start); + } + + if (va_present(vma->vm_mm, end - 1)) { + if (wbd) + cpu_dcache_wbinval_range(t_end, end); + if (flushi) + cpu_icache_inval_range(t_end, end); + } + + while (t_start < t_end) { + if (va_present(vma->vm_mm, t_start)) { + if (wbd) + cpu_dcache_wbinval_page(t_start); + if (flushi) + cpu_icache_inval_page(t_start); + } + t_start += PAGE_SIZE; + } + __nds32__msync_all(); +} +static inline void cpu_l2cache_op(unsigned long start, unsigned long end, unsigned long op) +{ +#ifdef CONFIG_CACHE_L2 + if (atl2c_base) { + unsigned long p_start = __pa(start); + unsigned long p_end = __pa(end); + unsigned long cmd; + unsigned long line_size; + /* TODO Can Use PAGE Mode to optimize if range large than PAGE_SIZE */ + line_size = L2_CACHE_LINE_SIZE(); + p_start = p_start & (~(line_size - 1)); + p_end = (p_end + line_size - 1) & (~(line_size - 1)); + cmd = + (p_start & ~(line_size - 1)) | op | + CCTL_SINGLE_CMD; + do { + L2_CMD_RDY(); + L2C_W_REG(L2_CCTL_CMD_OFF, cmd); + cmd += line_size; + p_start += line_size; + } while (p_end > p_start); + cmd = CCTL_CMD_L2_SYNC; + L2_CMD_RDY(); + L2C_W_REG(L2_CCTL_CMD_OFF, cmd); + L2_CMD_RDY(); + } +#endif +} +/* + * DMA + */ +void cpu_dma_wb_range(unsigned long start, unsigned long end) +{ + unsigned long line_size; + unsigned long flags; + line_size = L1_cache_info[DCACHE].line_size; + start = start & (~(line_size - 1)); + end = (end + line_size - 1) & (~(line_size - 1)); + if (unlikely(start == end)) + return; + + local_irq_save(flags); + cpu_dcache_wb_range(start, end); + cpu_l2cache_op(start, end, CCTL_CMD_L2_PA_WB); + __nds32__msync_all(); + local_irq_restore(flags); +} + +void cpu_dma_inval_range(unsigned long start, unsigned long end) +{ + unsigned long line_size; + unsigned long old_start = start; + unsigned long old_end = end; + unsigned long flags; + line_size = L1_cache_info[DCACHE].line_size; + start = start & (~(line_size - 1)); + end = (end + line_size - 1) & (~(line_size - 1)); + if (unlikely(start == end)) + return; + local_irq_save(flags); + if (start != old_start) { + cpu_dcache_wbinval_range(start, start + line_size); + cpu_l2cache_op(start, start + line_size, CCTL_CMD_L2_PA_WBINVAL); + } + if (end != old_end) { + cpu_dcache_wbinval_range(end - line_size, end); + cpu_l2cache_op(end - line_size, end, CCTL_CMD_L2_PA_WBINVAL); + } + cpu_dcache_inval_range(start, end); + cpu_l2cache_op(start, end, CCTL_CMD_L2_PA_INVAL); + __nds32__msync_all(); + local_irq_restore(flags); + +} + +void cpu_dma_wbinval_range(unsigned long start, unsigned long end) +{ + unsigned long line_size; + unsigned long flags; + line_size = L1_cache_info[DCACHE].line_size; + start = start & (~(line_size - 1)); + end = (end + line_size - 1) & (~(line_size - 1)); + if (unlikely(start == end)) + return; + + local_irq_save(flags); + cpu_dcache_wbinval_range(start, end); + cpu_l2cache_op(start, end, CCTL_CMD_L2_PA_WBINVAL); + __nds32__msync_all(); + local_irq_restore(flags); +} + +void cpu_proc_init(void) +{ +} + +void cpu_proc_fin(void) +{ +} + +void cpu_do_idle(void) +{ + __nds32__standby_no_wake_grant(); +} + +void cpu_reset(unsigned long reset) +{ + u32 tmp; + GIE_DISABLE(); + tmp = __nds32__mfsr(NDS32_SR_CACHE_CTL); + tmp &= ~(CACHE_CTL_mskIC_EN | CACHE_CTL_mskDC_EN); + __nds32__mtsr_isb(tmp, NDS32_SR_CACHE_CTL); + cpu_dcache_wbinval_all(); + cpu_icache_inval_all(); + + __asm__ __volatile__("jr.toff %0\n\t"::"r"(reset)); +} + +void cpu_switch_mm(struct mm_struct *mm) +{ + unsigned long cid; + cid = __nds32__mfsr(NDS32_SR_TLB_MISC); + cid = (cid & ~TLB_MISC_mskCID) | mm->context.id; + __nds32__mtsr_dsb(cid, NDS32_SR_TLB_MISC); + __nds32__mtsr_isb(__pa(mm->pgd), NDS32_SR_L1_PPTB); +} diff --git a/arch/nds32/mm/tlb.c b/arch/nds32/mm/tlb.c new file mode 100644 index 0000000..b397b9f --- /dev/null +++ b/arch/nds32/mm/tlb.c @@ -0,0 +1,63 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/spinlock_types.h> +#include <linux/mm.h> +#include <linux/sched.h> +#include <asm/nds32.h> +#include <nds32_intrinsic.h> + +unsigned int cpu_last_cid = { TLB_MISC_mskCID + (2 << TLB_MISC_offCID) }; + +DEFINE_SPINLOCK(cid_lock); + +void local_flush_tlb_range(struct vm_area_struct *vma, + unsigned long start, unsigned long end) +{ + unsigned long flags, ocid, ncid; + + if ((end - start) > 0x400000) { + __nds32__tlbop_flua(); + __nds32__isb(); + return; + } + + spin_lock_irqsave(&cid_lock, flags); + ocid = __nds32__mfsr(NDS32_SR_TLB_MISC); + ncid = (ocid & ~TLB_MISC_mskCID) | vma->vm_mm->context.id; + __nds32__mtsr_dsb(ncid, NDS32_SR_TLB_MISC); + while (start < end) { + __nds32__tlbop_inv(start); + __nds32__isb(); + start += PAGE_SIZE; + } + __nds32__mtsr_dsb(ocid, NDS32_SR_TLB_MISC); + spin_unlock_irqrestore(&cid_lock, flags); +} + +void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long addr) +{ + unsigned long flags, ocid, ncid; + + spin_lock_irqsave(&cid_lock, flags); + ocid = __nds32__mfsr(NDS32_SR_TLB_MISC); + ncid = (ocid & ~TLB_MISC_mskCID) | vma->vm_mm->context.id; + __nds32__mtsr_dsb(ncid, NDS32_SR_TLB_MISC); + __nds32__tlbop_inv(addr); + __nds32__isb(); + __nds32__mtsr_dsb(ocid, NDS32_SR_TLB_MISC); + spin_unlock_irqrestore(&cid_lock, flags); +} -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
