From 4c6d9acce1f4ca815881f0e3adca192795eca1c5 Mon Sep 17 00:00:00 2001 From: Ian Munsie Date: Wed, 8 Oct 2014 19:55:00 +1100 Subject: [PATCH] powerpc/mm: Add hooks for cxl This adds hooks into the core powerpc mm code for cxl. The core powerpc code sometimes uses local tlbie. Unfortunately this won't work with the current cxl driver as it relies on snooping tlbie broadcasts. The cxl hardware can have TLB entries invalidated via MMIO but this is not currently supported by the driver. In future we can make local tlbie smarter so that it invalidates cxl contexts via MMIO when it needs to but for now we have this workaround. This workaround checks for any active cxl contexts and if so, disables local tlbie. This also adds a hook for when SLBs are invalidated. This ensures any corresponding SLBs in cxl are also invalidated at the same time. This is required for segment demotion. Signed-off-by: Ian Munsie Signed-off-by: Michael Neuling Signed-off-by: Michael Ellerman --- arch/powerpc/mm/copro_fault.c | 2 ++ arch/powerpc/mm/hash_native_64.c | 6 +++++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/mm/copro_fault.c b/arch/powerpc/mm/copro_fault.c index f2aa5a8..0f9939e 100644 --- a/arch/powerpc/mm/copro_fault.c +++ b/arch/powerpc/mm/copro_fault.c @@ -26,6 +26,7 @@ #include #include #include +#include /* * This ought to be kept in sync with the powerpc specific do_page_fault @@ -143,5 +144,6 @@ void copro_flush_all_slbs(struct mm_struct *mm) #ifdef CONFIG_SPU_BASE spu_flush_all_slbs(mm); #endif + cxl_slbia(mm); } EXPORT_SYMBOL_GPL(copro_flush_all_slbs); diff --git a/arch/powerpc/mm/hash_native_64.c b/arch/powerpc/mm/hash_native_64.c index afc0a82..ae4962a 100644 --- a/arch/powerpc/mm/hash_native_64.c +++ b/arch/powerpc/mm/hash_native_64.c @@ -29,6 +29,8 @@ #include #include +#include + #ifdef DEBUG_LOW #define DBG_LOW(fmt...) udbg_printf(fmt) #else @@ -149,9 +151,11 @@ static inline void __tlbiel(unsigned long vpn, int psize, int apsize, int ssize) static inline void tlbie(unsigned long vpn, int psize, int apsize, int ssize, int local) { - unsigned int use_local = local && mmu_has_feature(MMU_FTR_TLBIEL); + unsigned int use_local; int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE); + use_local = local && mmu_has_feature(MMU_FTR_TLBIEL) && !cxl_ctx_in_use(); + if (use_local) use_local = mmu_psize_defs[psize].tlbiel; if (lock_tlbie && !use_local) -- 2.7.4