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b=Pqg3Y2VIehLMg9GFhwgbfIXr9OdAX6jixlEdCLuGYZdoO8kNTX5Pte0qXLqN+1Ftxu SS7DZB2fUQZQ3kHgY6OrUSMrdt83k6DHygrdeNhC4LtXxsVe9jrQ0XKtQrZwTso20PT1 kQuOQ81UhQU5nAQJQJEThQ3OfjUbhIqxGsCXVJCm4cl8GuZKFhdfU521PC8rt9GRhg+D ydOO6+p7ybQa459l4j/smP2ZCXJwLaJvCIVuU2SKl9LfeMXTgWLoVAbYx5sgySeakehf Ntc3omACbSfvKamrci09E8chbi+72B/D2B5pN7WuZ6i9bVy5ziAtI5FTSKQIJF7SNzyf Hf2Q== X-Gm-Message-State: APjAAAUonKaoWiEoW56Ll0GioLzWHD5sWsAfBuAeu6kDDY4KgBvDZ4FH uUzLtIujU71uiDBAAl+AUVClOyQMcEGu+Q== X-Google-Smtp-Source: APXvYqz+BDHbgD7qukH/vezP1VLN3whoqN72vAt1hbNGgTnhWIm/NyG0wpSVl/DBavTZdzdqMlZAuQ== X-Received: by 2002:a17:902:ea:: with SMTP id a97mr8485356pla.182.1565189845515; Wed, 07 Aug 2019 07:57:25 -0700 (PDT) Received: from santosiv.in.ibm.com.com ([183.82.17.96]) by smtp.gmail.com with ESMTPSA id l4sm93617475pff.50.2019.08.07.07.57.22 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Wed, 07 Aug 2019 07:57:24 -0700 (PDT) From: Santosh Sivaraj To: linuxppc-dev , Linux Kernel Subject: [PATCH v8 3/7] powerpc/mce: Fix MCE handling for huge pages Date: Wed, 7 Aug 2019 20:26:56 +0530 Message-Id: <20190807145700.25599-4-santosh@fossix.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190807145700.25599-1-santosh@fossix.org> References: <20190807145700.25599-1-santosh@fossix.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Aneesh Kumar K.V" , Mahesh Salgaonkar , Nicholas Piggin , Chandan Rajendra , Reza Arbab Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Balbir Singh The current code would fail on huge pages addresses, since the shift would be incorrect. Use the correct page shift value returned by __find_linux_pte() to get the correct physical address. The code is more generic and can handle both regular and compound pages. Fixes: ba41e1e1ccb9 ("powerpc/mce: Hookup derror (load/store) UE errors") Signed-off-by: Balbir Singh [arbab@linux.ibm.com: Fixup pseries_do_memory_failure()] Signed-off-by: Reza Arbab Co-developed-by: Santosh Sivaraj Signed-off-by: Santosh Sivaraj --- arch/powerpc/include/asm/mce.h | 2 +- arch/powerpc/kernel/mce_power.c | 50 ++++++++++++++-------------- arch/powerpc/platforms/pseries/ras.c | 9 ++--- 3 files changed, 29 insertions(+), 32 deletions(-) diff --git a/arch/powerpc/include/asm/mce.h b/arch/powerpc/include/asm/mce.h index a4c6a74ad2fb..f3a6036b6bc0 100644 --- a/arch/powerpc/include/asm/mce.h +++ b/arch/powerpc/include/asm/mce.h @@ -209,7 +209,7 @@ extern void release_mce_event(void); extern void machine_check_queue_event(void); extern void machine_check_print_event_info(struct machine_check_event *evt, bool user_mode, bool in_guest); -unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr); +unsigned long addr_to_phys(struct pt_regs *regs, unsigned long addr); #ifdef CONFIG_PPC_BOOK3S_64 void flush_and_reload_slb(void); #endif /* CONFIG_PPC_BOOK3S_64 */ diff --git a/arch/powerpc/kernel/mce_power.c b/arch/powerpc/kernel/mce_power.c index a814d2dfb5b0..bed38a8e2e50 100644 --- a/arch/powerpc/kernel/mce_power.c +++ b/arch/powerpc/kernel/mce_power.c @@ -20,13 +20,14 @@ #include /* - * Convert an address related to an mm to a PFN. NOTE: we are in real - * mode, we could potentially race with page table updates. + * Convert an address related to an mm to a physical address. + * NOTE: we are in real mode, we could potentially race with page table updates. */ -unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr) +unsigned long addr_to_phys(struct pt_regs *regs, unsigned long addr) { - pte_t *ptep; - unsigned long flags; + pte_t *ptep, pte; + unsigned int shift; + unsigned long flags, phys_addr; struct mm_struct *mm; if (user_mode(regs)) @@ -35,14 +36,21 @@ unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr) mm = &init_mm; local_irq_save(flags); - if (mm == current->mm) - ptep = find_current_mm_pte(mm->pgd, addr, NULL, NULL); - else - ptep = find_init_mm_pte(addr, NULL); + ptep = __find_linux_pte(mm->pgd, addr, NULL, &shift); local_irq_restore(flags); + if (!ptep || pte_special(*ptep)) return ULONG_MAX; - return pte_pfn(*ptep); + + pte = *ptep; + if (shift > PAGE_SHIFT) { + unsigned long rpnmask = (1ul << shift) - PAGE_SIZE; + + pte = __pte(pte_val(pte) | (addr & rpnmask)); + } + phys_addr = pte_pfn(pte) << PAGE_SHIFT; + + return phys_addr; } /* flush SLBs and reload */ @@ -354,18 +362,16 @@ static int mce_find_instr_ea_and_pfn(struct pt_regs *regs, uint64_t *addr, * faults */ int instr; - unsigned long pfn, instr_addr; + unsigned long instr_addr; struct instruction_op op; struct pt_regs tmp = *regs; - pfn = addr_to_pfn(regs, regs->nip); - if (pfn != ULONG_MAX) { - instr_addr = (pfn << PAGE_SHIFT) + (regs->nip & ~PAGE_MASK); + instr_addr = addr_to_phys(regs, regs->nip) + (regs->nip & ~PAGE_MASK); + if (instr_addr != ULONG_MAX) { instr = *(unsigned int *)(instr_addr); if (!analyse_instr(&op, &tmp, instr)) { - pfn = addr_to_pfn(regs, op.ea); *addr = op.ea; - *phys_addr = (pfn << PAGE_SHIFT); + *phys_addr = addr_to_phys(regs, op.ea); return 0; } /* @@ -440,15 +446,9 @@ static int mce_handle_ierror(struct pt_regs *regs, *addr = regs->nip; if (mce_err->sync_error && table[i].error_type == MCE_ERROR_TYPE_UE) { - unsigned long pfn; - - if (get_paca()->in_mce < MAX_MCE_DEPTH) { - pfn = addr_to_pfn(regs, regs->nip); - if (pfn != ULONG_MAX) { - *phys_addr = - (pfn << PAGE_SHIFT); - } - } + if (get_paca()->in_mce < MAX_MCE_DEPTH) + *phys_addr = addr_to_phys(regs, + regs->nip); } } return handled; diff --git a/arch/powerpc/platforms/pseries/ras.c b/arch/powerpc/platforms/pseries/ras.c index f16fdd0f71f7..5743f6353638 100644 --- a/arch/powerpc/platforms/pseries/ras.c +++ b/arch/powerpc/platforms/pseries/ras.c @@ -739,13 +739,10 @@ static void pseries_do_memory_failure(struct pt_regs *regs, if (mce_log->sub_err_type & UE_LOGICAL_ADDR_PROVIDED) { paddr = be64_to_cpu(mce_log->logical_address); } else if (mce_log->sub_err_type & UE_EFFECTIVE_ADDR_PROVIDED) { - unsigned long pfn; - - pfn = addr_to_pfn(regs, - be64_to_cpu(mce_log->effective_address)); - if (pfn == ULONG_MAX) + paddr = addr_to_phys(regs, + be64_to_cpu(mce_log->effective_address)); + if (paddr == ULONG_MAX) return; - paddr = pfn << PAGE_SHIFT; } else { return; } -- 2.20.1