From mboxrd@z Thu Jan 1 00:00:00 1970 From: Doug Berger Subject: [PATCH v2 1/8] arm64: mm: Allow installation of memory abort handlers Date: Tue, 28 Mar 2017 14:34:24 -0700 Message-ID: <20170328213431.10904-2-opendmb@gmail.com> References: <20170328213431.10904-1-opendmb@gmail.com> Return-path: In-Reply-To: <20170328213431.10904-1-opendmb@gmail.com> Sender: linux-kernel-owner@vger.kernel.org To: mark.rutland@arm.com Cc: robh+dt@kernel.org, catalin.marinas@arm.com, will.deacon@arm.com, computersforpeace@gmail.com, gregory.0xf0@gmail.com, f.fainelli@gmail.com, bcm-kernel-feedback-list@broadcom.com, opendmb@gmail.com, wangkefeng.wang@huawei.com, james.morse@arm.com, mingo@kernel.org, sandeepa.s.prabhu@gmail.com, shijie.huang@arm.com, linus.walleij@linaro.org, treding@nvidia.com, jonathanh@nvidia.com, olof@lixom.net, mirza.krak@gmail.com, suzuki.poulose@arm.com, bgolaszewski@baylibre.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org List-Id: devicetree@vger.kernel.org From: Florian Fainelli Similarly to what the ARM/Linux kernel provides, add a hook_fault_code() function which allows drivers or other parts of the kernel to install custom memory abort handlers. This is useful when a given SoC's busing does not propagate the exact faulting physical address, but there is a way to read it through e.g: a special arbiter driver. Signed-off-by: Florian Fainelli --- arch/arm64/include/asm/system_misc.h | 3 +++ arch/arm64/mm/fault.c | 15 ++++++++++++++- 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h index bc812435bc76..e05f5b8c7c1c 100644 --- a/arch/arm64/include/asm/system_misc.h +++ b/arch/arm64/include/asm/system_misc.h @@ -38,6 +38,9 @@ void arm64_notify_die(const char *str, struct pt_regs *regs, void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *), int sig, int code, const char *name); +void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int, + struct pt_regs *), + int sig, int code, const char *name); struct mm_struct; extern void show_pte(struct mm_struct *mm, unsigned long addr); diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 4bf899fb451b..cdf1260f1005 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -488,7 +488,7 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs) return 1; } -static const struct fault_info { +static struct fault_info { int (*fn)(unsigned long addr, unsigned int esr, struct pt_regs *regs); int sig; int code; @@ -560,6 +560,19 @@ static const struct fault_info { { do_bad, SIGBUS, 0, "unknown 63" }, }; +void __init hook_fault_code(int nr, + int (*fn)(unsigned long, unsigned int, struct pt_regs *), + int sig, int code, const char *name) +{ + BUG_ON(nr < 0 || nr >= ARRAY_SIZE(fault_info)); + + fault_info[nr].fn = fn; + fault_info[nr].sig = sig; + fault_info[nr].code = code; + fault_info[nr].name = name; +} + + static const char *fault_name(unsigned int esr) { const struct fault_info *inf = fault_info + (esr & 63); -- 2.12.0