Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: Michael Ellerman mpe@ellerman.id.au Cc: Benjamin Herrenschmidt benh@kernel.crashing.org Cc: Paul Mackerras paulus@samba.org Cc: linuxppc-dev@lists.ozlabs.org --- Note: Completely untested --- 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 @@ -406,6 +406,7 @@ menu "Kernel options" config HIGHMEM bool "High memory support" depends on PPC32 + select KMAP_ATOMIC_GENERIC
source "kernel/Kconfig.hz"
--- a/arch/powerpc/include/asm/highmem.h +++ b/arch/powerpc/include/asm/highmem.h @@ -29,7 +29,6 @@ #include <asm/page.h> #include <asm/fixmap.h>
-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_temp_post_map(vaddr, pteval) \ + local_flush_tlb_page(NULL, vaddr) +#define arch_kmap_temp_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 mingo@redhat.com - * - * Reworked for PowerPC by various contributors. Moved from - * highmem.h by Benjamin Herrenschmidt (c) 2009 IBM Corp. - */ - -#include <linux/highmem.h> -#include <linux/module.h> - -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 @@ -60,11 +60,6 @@ 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) { @@ -233,8 +228,6 @@ 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",