From baf1ed24b27db475b38f534953885d0425e2232d Mon Sep 17 00:00:00 2001 From: Benjamin Gray Date: Wed, 9 Nov 2022 15:51:07 +1100 Subject: powerpc/mm: Remove empty hash__ functions The empty hash__* functions are unnecessary. The empty definitions were introduced when 64-bit Hash support was added, as the functions were still used in generic code. These empty definitions were prefixed with hash__ when Radix support was added, and new wrappers with the original names were added that selected the Radix or Hash version based on radix_enabled(). But the hash__ prefixed functions were not part of a public interface, so there is no need to include them for compatibility with anything. Generic code will use the non-prefixed wrappers, and Hash specific code will know that there is no point in calling them (or even worse, call them and expect them to do something). Signed-off-by: Benjamin Gray Reviewed-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20221109045112.187069-5-bgray@linux.ibm.com --- arch/powerpc/include/asm/book3s/64/tlbflush.h | 27 +++++++++------------------ 1 file changed, 9 insertions(+), 18 deletions(-) (limited to 'arch/powerpc/include/asm/book3s/64/tlbflush.h') diff --git a/arch/powerpc/include/asm/book3s/64/tlbflush.h b/arch/powerpc/include/asm/book3s/64/tlbflush.h index 67655cd60545..2254a40f0564 100644 --- a/arch/powerpc/include/asm/book3s/64/tlbflush.h +++ b/arch/powerpc/include/asm/book3s/64/tlbflush.h @@ -47,8 +47,7 @@ static inline void flush_pmd_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) { if (radix_enabled()) - return radix__flush_pmd_tlb_range(vma, start, end); - return hash__flush_tlb_range(vma, start, end); + radix__flush_pmd_tlb_range(vma, start, end); } #define __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE @@ -57,39 +56,34 @@ static inline void flush_hugetlb_tlb_range(struct vm_area_struct *vma, unsigned long end) { if (radix_enabled()) - return radix__flush_hugetlb_tlb_range(vma, start, end); - return hash__flush_tlb_range(vma, start, end); + radix__flush_hugetlb_tlb_range(vma, start, end); } static inline void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) { if (radix_enabled()) - return radix__flush_tlb_range(vma, start, end); - return hash__flush_tlb_range(vma, start, end); + radix__flush_tlb_range(vma, start, end); } static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end) { if (radix_enabled()) - return radix__flush_tlb_kernel_range(start, end); - return hash__flush_tlb_kernel_range(start, end); + radix__flush_tlb_kernel_range(start, end); } static inline void local_flush_tlb_mm(struct mm_struct *mm) { if (radix_enabled()) - return radix__local_flush_tlb_mm(mm); - return hash__local_flush_tlb_mm(mm); + radix__local_flush_tlb_mm(mm); } static inline void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr) { if (radix_enabled()) - return radix__local_flush_tlb_page(vma, vmaddr); - return hash__local_flush_tlb_page(vma, vmaddr); + radix__local_flush_tlb_page(vma, vmaddr); } static inline void local_flush_all_mm(struct mm_struct *mm) @@ -102,24 +96,21 @@ static inline void local_flush_all_mm(struct mm_struct *mm) static inline void tlb_flush(struct mmu_gather *tlb) { if (radix_enabled()) - return radix__tlb_flush(tlb); - return hash__tlb_flush(tlb); + radix__tlb_flush(tlb); } #ifdef CONFIG_SMP static inline void flush_tlb_mm(struct mm_struct *mm) { if (radix_enabled()) - return radix__flush_tlb_mm(mm); - return hash__flush_tlb_mm(mm); + radix__flush_tlb_mm(mm); } static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr) { if (radix_enabled()) - return radix__flush_tlb_page(vma, vmaddr); - return hash__flush_tlb_page(vma, vmaddr); + radix__flush_tlb_page(vma, vmaddr); } static inline void flush_all_mm(struct mm_struct *mm) -- cgit v1.2.3 From d34471c9bd5d47ab148dd68817631a4238f755c4 Mon Sep 17 00:00:00 2001 From: Benjamin Gray Date: Wed, 9 Nov 2022 15:51:09 +1100 Subject: powerpc/mm: Remove flush_all_mm, local_flush_all_mm These functions were introduced for "cxl: Enable global TLBIs for cxl contexts" [1], which ended up using them for Radix only. They were never implemented on Hash (and creating an implementation appears to be difficult), so nothing can actually rely on them. They behave differently to the existing surrounding functions too, in that they actually need to do something on Hash. The other functions are primarily for use in generic code that expects their definitions, but Hash updates the TLB during PTE updates. After replacing the only usage with the Radix specific version, there are no more users of these functions, and given they are not implemented anyway it is safe to delete them. [1]: https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20170903181513.29635-1-fbarrat@linux.vnet.ibm.com/ Signed-off-by: Benjamin Gray Reviewed-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20221109045112.187069-7-bgray@linux.ibm.com --- arch/powerpc/include/asm/book3s/64/tlbflush-hash.h | 22 ---------------------- arch/powerpc/include/asm/book3s/64/tlbflush.h | 15 --------------- 2 files changed, 37 deletions(-) (limited to 'arch/powerpc/include/asm/book3s/64/tlbflush.h') diff --git a/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h b/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h index a9ef40dc263e..146287d9580f 100644 --- a/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h +++ b/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h @@ -66,28 +66,6 @@ extern void flush_hash_hugepage(unsigned long vsid, unsigned long addr, pmd_t *pmdp, unsigned int psize, int ssize, unsigned long flags); -static inline void hash__local_flush_all_mm(struct mm_struct *mm) -{ - /* - * There's no Page Walk Cache for hash, so what is needed is - * the same as flush_tlb_mm(), which doesn't really make sense - * with hash. So the only thing we could do is flush the - * entire LPID! Punt for now, as it's not being used. - */ - WARN_ON_ONCE(1); -} - -static inline void hash__flush_all_mm(struct mm_struct *mm) -{ - /* - * There's no Page Walk Cache for hash, so what is needed is - * the same as flush_tlb_mm(), which doesn't really make sense - * with hash. So the only thing we could do is flush the - * entire LPID! Punt for now, as it's not being used. - */ - WARN_ON_ONCE(1); -} - struct mmu_gather; extern void hash__tlb_flush(struct mmu_gather *tlb); diff --git a/arch/powerpc/include/asm/book3s/64/tlbflush.h b/arch/powerpc/include/asm/book3s/64/tlbflush.h index 2254a40f0564..c56a0aee8124 100644 --- a/arch/powerpc/include/asm/book3s/64/tlbflush.h +++ b/arch/powerpc/include/asm/book3s/64/tlbflush.h @@ -86,13 +86,6 @@ static inline void local_flush_tlb_page(struct vm_area_struct *vma, radix__local_flush_tlb_page(vma, vmaddr); } -static inline void local_flush_all_mm(struct mm_struct *mm) -{ - if (radix_enabled()) - return radix__local_flush_all_mm(mm); - return hash__local_flush_all_mm(mm); -} - static inline void tlb_flush(struct mmu_gather *tlb) { if (radix_enabled()) @@ -112,17 +105,9 @@ static inline void flush_tlb_page(struct vm_area_struct *vma, if (radix_enabled()) radix__flush_tlb_page(vma, vmaddr); } - -static inline void flush_all_mm(struct mm_struct *mm) -{ - if (radix_enabled()) - return radix__flush_all_mm(mm); - return hash__flush_all_mm(mm); -} #else #define flush_tlb_mm(mm) local_flush_tlb_mm(mm) #define flush_tlb_page(vma, addr) local_flush_tlb_page(vma, addr) -#define flush_all_mm(mm) local_flush_all_mm(mm) #endif /* CONFIG_SMP */ #define flush_tlb_fix_spurious_fault flush_tlb_fix_spurious_fault -- cgit v1.2.3 From 274d842fa1efd9449e62222c8896e0be11621f1f Mon Sep 17 00:00:00 2001 From: Benjamin Gray Date: Wed, 9 Nov 2022 15:51:10 +1100 Subject: powerpc/tlb: Add local flush for page given mm_struct and psize Adds a local TLB flush operation that works given an mm_struct, VA to flush, and page size representation. Most implementations mirror the surrounding code. The book3s/32/tlbflush.h implementation is left as a BUILD_BUG because it is more complicated and not required for anything as yet. This removes the need to create a vm_area_struct, which the temporary patching mm work does not need. Signed-off-by: Benjamin Gray Reviewed-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20221109045112.187069-8-bgray@linux.ibm.com --- arch/powerpc/include/asm/book3s/32/tlbflush.h | 9 +++++++++ arch/powerpc/include/asm/book3s/64/tlbflush.h | 7 +++++++ arch/powerpc/include/asm/nohash/tlbflush.h | 7 +++++++ arch/powerpc/mm/nohash/tlb.c | 8 ++++++++ 4 files changed, 31 insertions(+) (limited to 'arch/powerpc/include/asm/book3s/64/tlbflush.h') diff --git a/arch/powerpc/include/asm/book3s/32/tlbflush.h b/arch/powerpc/include/asm/book3s/32/tlbflush.h index ba1743c52b56..4be572908124 100644 --- a/arch/powerpc/include/asm/book3s/32/tlbflush.h +++ b/arch/powerpc/include/asm/book3s/32/tlbflush.h @@ -2,6 +2,8 @@ #ifndef _ASM_POWERPC_BOOK3S_32_TLBFLUSH_H #define _ASM_POWERPC_BOOK3S_32_TLBFLUSH_H +#include + #define MMU_NO_CONTEXT (0) /* * TLB flushing for "classic" hash-MMU 32-bit CPUs, 6xx, 7xx, 7xxx @@ -74,6 +76,13 @@ static inline void local_flush_tlb_page(struct vm_area_struct *vma, { flush_tlb_page(vma, vmaddr); } + +static inline void local_flush_tlb_page_psize(struct mm_struct *mm, + unsigned long vmaddr, int psize) +{ + BUILD_BUG(); +} + static inline void local_flush_tlb_mm(struct mm_struct *mm) { flush_tlb_mm(mm); diff --git a/arch/powerpc/include/asm/book3s/64/tlbflush.h b/arch/powerpc/include/asm/book3s/64/tlbflush.h index c56a0aee8124..dd39313242b4 100644 --- a/arch/powerpc/include/asm/book3s/64/tlbflush.h +++ b/arch/powerpc/include/asm/book3s/64/tlbflush.h @@ -86,6 +86,13 @@ static inline void local_flush_tlb_page(struct vm_area_struct *vma, radix__local_flush_tlb_page(vma, vmaddr); } +static inline void local_flush_tlb_page_psize(struct mm_struct *mm, + unsigned long vmaddr, int psize) +{ + if (radix_enabled()) + radix__local_flush_tlb_page_psize(mm, vmaddr, psize); +} + static inline void tlb_flush(struct mmu_gather *tlb) { if (radix_enabled()) diff --git a/arch/powerpc/include/asm/nohash/tlbflush.h b/arch/powerpc/include/asm/nohash/tlbflush.h index bdaf34ad41ea..9a2cf83ea4f1 100644 --- a/arch/powerpc/include/asm/nohash/tlbflush.h +++ b/arch/powerpc/include/asm/nohash/tlbflush.h @@ -45,6 +45,12 @@ static inline void local_flush_tlb_page(struct vm_area_struct *vma, unsigned lon asm volatile ("tlbie %0; sync" : : "r" (vmaddr) : "memory"); } +static inline void local_flush_tlb_page_psize(struct mm_struct *mm, + unsigned long vmaddr, int psize) +{ + asm volatile ("tlbie %0; sync" : : "r" (vmaddr) : "memory"); +} + static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end) { start &= PAGE_MASK; @@ -58,6 +64,7 @@ static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end extern void flush_tlb_kernel_range(unsigned long start, unsigned long end); extern void local_flush_tlb_mm(struct mm_struct *mm); extern void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr); +void local_flush_tlb_page_psize(struct mm_struct *mm, unsigned long vmaddr, int psize); extern void __local_flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr, int tsize, int ind); diff --git a/arch/powerpc/mm/nohash/tlb.c b/arch/powerpc/mm/nohash/tlb.c index 2c15c86c7015..a903b308acc5 100644 --- a/arch/powerpc/mm/nohash/tlb.c +++ b/arch/powerpc/mm/nohash/tlb.c @@ -184,6 +184,14 @@ void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr) mmu_get_tsize(mmu_virtual_psize), 0); } EXPORT_SYMBOL(local_flush_tlb_page); + +void local_flush_tlb_page_psize(struct mm_struct *mm, + unsigned long vmaddr, int psize) +{ + __local_flush_tlb_page(mm, vmaddr, mmu_get_tsize(psize), 0); +} +EXPORT_SYMBOL(local_flush_tlb_page_psize); + #endif /* -- cgit v1.2.3