mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 11:55:12 +07:00
f136008f31
After fixaddr_init is separated from highmem, we could use tcm without highmem selected. (610 (abiv1) don't support highmem, but it could use tcm now.) Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
148 lines
2.9 KiB
C
148 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/module.h>
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#include <linux/highmem.h>
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#include <linux/smp.h>
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#include <linux/memblock.h>
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#include <asm/fixmap.h>
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#include <asm/tlbflush.h>
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#include <asm/cacheflush.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(struct page *page)
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{
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void *addr;
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might_sleep();
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if (!PageHighMem(page))
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return page_address(page);
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addr = kmap_high(page);
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flush_tlb_one((unsigned long)addr);
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return addr;
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}
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EXPORT_SYMBOL(kmap);
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void kunmap(struct page *page)
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{
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BUG_ON(in_interrupt());
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if (!PageHighMem(page))
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return;
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kunmap_high(page);
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}
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EXPORT_SYMBOL(kunmap);
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void *kmap_atomic(struct page *page)
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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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if (!PageHighMem(page))
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return page_address(page);
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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, PAGE_KERNEL));
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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);
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void __kunmap_atomic(void *kvaddr)
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{
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unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
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int idx;
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if (vaddr < FIXADDR_START)
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goto out;
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#ifdef CONFIG_DEBUG_HIGHMEM
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idx = KM_TYPE_NR*smp_processor_id() + kmap_atomic_idx();
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BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
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pte_clear(&init_mm, vaddr, kmap_pte - idx);
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flush_tlb_one(vaddr);
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#else
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(void) idx; /* to kill a warning */
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#endif
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kmap_atomic_idx_pop();
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out:
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pagefault_enable();
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preempt_enable();
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}
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EXPORT_SYMBOL(__kunmap_atomic);
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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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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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struct page *kmap_atomic_to_page(void *ptr)
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{
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unsigned long idx, vaddr = (unsigned long)ptr;
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pte_t *pte;
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if (vaddr < FIXADDR_START)
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return virt_to_page(ptr);
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idx = virt_to_fix(vaddr);
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pte = kmap_pte - (idx - FIX_KMAP_BEGIN);
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return pte_page(*pte);
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}
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static void __init kmap_pages_init(void)
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{
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unsigned long vaddr;
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pgd_t *pgd;
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pmd_t *pmd;
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pud_t *pud;
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pte_t *pte;
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vaddr = PKMAP_BASE;
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fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, swapper_pg_dir);
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pgd = swapper_pg_dir + __pgd_offset(vaddr);
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pud = (pud_t *)pgd;
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pmd = pmd_offset(pud, vaddr);
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pte = pte_offset_kernel(pmd, vaddr);
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pkmap_page_table = pte;
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}
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void __init kmap_init(void)
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{
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unsigned long vaddr;
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kmap_pages_init();
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vaddr = __fix_to_virt(FIX_KMAP_BEGIN);
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kmap_pte = pte_offset_kernel((pmd_t *)pgd_offset_k(vaddr), vaddr);
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}
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