From 3af9ca89d4398239a71471cffb488e3104990e23 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Tue, 3 Nov 2020 10:27:23 +0100 Subject: [PATCH 034/323] csky/mm/highmem: Switch to generic kmap atomic Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz No reason having the same code in every architecture. Signed-off-by: Thomas Gleixner Cc: linux-csky@vger.kernel.org Signed-off-by: Sebastian Andrzej Siewior --- arch/csky/Kconfig | 1 + arch/csky/include/asm/fixmap.h | 4 +- arch/csky/include/asm/highmem.h | 6 ++- arch/csky/mm/highmem.c | 75 +-------------------------------- 4 files changed, 8 insertions(+), 78 deletions(-) diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig index 7bf0a617e94c..c9f2533cc53d 100644 --- 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 diff --git a/arch/csky/include/asm/fixmap.h b/arch/csky/include/asm/fixmap.h index 81f9477d5330..4b589cc20900 100644 --- a/arch/csky/include/asm/fixmap.h +++ b/arch/csky/include/asm/fixmap.h @@ -8,7 +8,7 @@ #include #ifdef CONFIG_HIGHMEM #include -#include +#include #endif enum fixed_addresses { @@ -17,7 +17,7 @@ enum fixed_addresses { #endif #ifdef CONFIG_HIGHMEM FIX_KMAP_BEGIN, - FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1, + FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1, #endif __end_of_fixed_addresses }; diff --git a/arch/csky/include/asm/highmem.h b/arch/csky/include/asm/highmem.h index 14645e3d5cd5..1f4ed3f4c0d9 100644 --- a/arch/csky/include/asm/highmem.h +++ b/arch/csky/include/asm/highmem.h @@ -9,7 +9,7 @@ #include #include #include -#include +#include #include /* undef for production */ @@ -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__ */ diff --git a/arch/csky/mm/highmem.c b/arch/csky/mm/highmem.c index 89c10800a002..4161df3c6c15 100644 --- 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); -} -- 2.43.0