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mips/mm/highmem: Switch to generic kmap atomic
No reason having the same code in every architecture Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20201103095857.885321106@linutronix.de
This commit is contained in:
Thomas Gleixner
parent
7ac1b26b0a
commit
a4c33e83bc
@ -2719,6 +2719,7 @@ config WAR_MIPS34K_MISSED_ITLB
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config HIGHMEM
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bool "High Memory Support"
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depends on 32BIT && CPU_SUPPORTS_HIGHMEM && SYS_SUPPORTS_HIGHMEM && !CPU_MIPS32_3_5_EVA
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select KMAP_LOCAL
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config CPU_SUPPORTS_HIGHMEM
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bool
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@ -17,7 +17,7 @@
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#include <spaces.h>
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#ifdef CONFIG_HIGHMEM
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#include <linux/threads.h>
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#include <asm/kmap_types.h>
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#include <asm/kmap_size.h>
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#endif
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/*
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@ -52,7 +52,7 @@ enum fixed_addresses {
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#ifdef CONFIG_HIGHMEM
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/* reserved pte's for temporary kernel mappings */
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FIX_KMAP_BEGIN = FIX_CMAP_END + 1,
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FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
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FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1,
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#endif
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__end_of_fixed_addresses
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};
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@ -24,7 +24,7 @@
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#include <linux/interrupt.h>
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#include <linux/uaccess.h>
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#include <asm/cpu-features.h>
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#include <asm/kmap_types.h>
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#include <asm/kmap_size.h>
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/* declarations for highmem.c */
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extern unsigned long highstart_pfn, highend_pfn;
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@ -48,11 +48,11 @@ extern pte_t *pkmap_page_table;
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#define ARCH_HAS_KMAP_FLUSH_TLB
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extern void kmap_flush_tlb(unsigned long addr);
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extern void *kmap_atomic_pfn(unsigned long pfn);
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#define flush_cache_kmaps() BUG_ON(cpu_has_dc_aliases)
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extern void kmap_init(void);
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#define arch_kmap_local_post_map(vaddr, pteval) local_flush_tlb_one(vaddr)
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#define arch_kmap_local_post_unmap(vaddr) local_flush_tlb_one(vaddr)
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#endif /* __KERNEL__ */
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@ -1,13 +0,0 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_KMAP_TYPES_H
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#define _ASM_KMAP_TYPES_H
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#ifdef CONFIG_DEBUG_HIGHMEM
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#define __WITH_KM_FENCE
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#endif
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#include <asm-generic/kmap_types.h>
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#undef __WITH_KM_FENCE
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#endif
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@ -8,8 +8,6 @@
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#include <asm/fixmap.h>
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#include <asm/tlbflush.h>
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static pte_t *kmap_pte;
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unsigned long highstart_pfn, highend_pfn;
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void kmap_flush_tlb(unsigned long addr)
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@ -17,78 +15,3 @@ void kmap_flush_tlb(unsigned long addr)
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flush_tlb_one(addr);
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}
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EXPORT_SYMBOL(kmap_flush_tlb);
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void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
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{
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unsigned long vaddr;
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int idx, type;
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type = kmap_atomic_idx_push();
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idx = type + KM_TYPE_NR*smp_processor_id();
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vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
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#ifdef CONFIG_DEBUG_HIGHMEM
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BUG_ON(!pte_none(*(kmap_pte - idx)));
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#endif
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set_pte(kmap_pte-idx, mk_pte(page, prot));
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local_flush_tlb_one((unsigned long)vaddr);
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return (void*) vaddr;
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}
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EXPORT_SYMBOL(kmap_atomic_high_prot);
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void kunmap_atomic_high(void *kvaddr)
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{
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unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
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int type __maybe_unused;
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if (vaddr < FIXADDR_START)
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return;
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type = kmap_atomic_idx();
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#ifdef CONFIG_DEBUG_HIGHMEM
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{
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int idx = type + KM_TYPE_NR * smp_processor_id();
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BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
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/*
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* force other mappings to Oops if they'll try to access
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* this pte without first remap it
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*/
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pte_clear(&init_mm, vaddr, kmap_pte-idx);
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local_flush_tlb_one(vaddr);
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}
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#endif
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kmap_atomic_idx_pop();
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}
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EXPORT_SYMBOL(kunmap_atomic_high);
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/*
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* This is the same as kmap_atomic() but can map memory that doesn't
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* have a struct page associated with it.
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*/
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void *kmap_atomic_pfn(unsigned long pfn)
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{
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unsigned long vaddr;
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int idx, type;
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preempt_disable();
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pagefault_disable();
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type = kmap_atomic_idx_push();
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idx = type + KM_TYPE_NR*smp_processor_id();
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vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
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set_pte(kmap_pte-idx, pfn_pte(pfn, PAGE_KERNEL));
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flush_tlb_one(vaddr);
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return (void*) vaddr;
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}
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void __init kmap_init(void)
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{
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unsigned long kmap_vstart;
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/* cache the first kmap pte */
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kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
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kmap_pte = virt_to_kpte(kmap_vstart);
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}
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@ -36,7 +36,6 @@
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#include <asm/cachectl.h>
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#include <asm/cpu.h>
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#include <asm/dma.h>
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#include <asm/kmap_types.h>
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#include <asm/maar.h>
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#include <asm/mmu_context.h>
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#include <asm/sections.h>
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@ -402,9 +401,6 @@ void __init paging_init(void)
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pagetable_init();
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#ifdef CONFIG_HIGHMEM
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kmap_init();
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#endif
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#ifdef CONFIG_ZONE_DMA
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max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
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#endif
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