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([2a01:e0a:999:a3a0:2b3d:6c70:9dbf:5ede]) by smtp.gmail.com with ESMTPSA id x11-20020a5d650b000000b00318147fd2d3sm14926060wru.41.2023.09.26.08.03.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 Sep 2023 08:03:57 -0700 (PDT) From: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= To: Paul Walmsley , Palmer Dabbelt , Albert Ou Cc: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= , Atish Patra , Andrew Jones , Evan Green , =?UTF-8?q?Bj=C3=B6rn=20Topel?= , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Ron Minnich , Daniel Maslowski Subject: [PATCH 6/7] riscv: report misaligned accesses emulation to hwprobe Date: Tue, 26 Sep 2023 17:03:15 +0200 Message-Id: <20230926150316.1129648-7-cleger@rivosinc.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230926150316.1129648-1-cleger@rivosinc.com> References: <20230926150316.1129648-1-cleger@rivosinc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org hwprobe provides a way to report if misaligned access are emulated. In order to correctly populate that feature, we can check if it actually traps when doing a misaligned access. This can be checked using an exception table entry which will actually be used when a misaligned access is done from kernel mode. Signed-off-by: Clément Léger --- arch/riscv/include/asm/cpufeature.h | 6 +++ arch/riscv/kernel/cpufeature.c | 6 ++- arch/riscv/kernel/setup.c | 1 + arch/riscv/kernel/traps_misaligned.c | 63 +++++++++++++++++++++++++++- 4 files changed, 74 insertions(+), 2 deletions(-) diff --git a/arch/riscv/include/asm/cpufeature.h b/arch/riscv/include/asm/cpufeature.h index d0345bd659c9..c1f0ef02cd7d 100644 --- a/arch/riscv/include/asm/cpufeature.h +++ b/arch/riscv/include/asm/cpufeature.h @@ -8,6 +8,7 @@ #include #include +#include /* * These are probed via a device_initcall(), via either the SBI or directly @@ -32,4 +33,9 @@ extern struct riscv_isainfo hart_isa[NR_CPUS]; void check_unaligned_access(int cpu); +bool unaligned_ctl_available(void); + +bool check_unaligned_access_emulated(int cpu); +void unaligned_emulation_finish(void); + #endif diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index 1cfbba65d11a..fbbde800bc21 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -568,6 +568,9 @@ void check_unaligned_access(int cpu) void *src; long speed = RISCV_HWPROBE_MISALIGNED_SLOW; + if (check_unaligned_access_emulated(cpu)) + return; + page = alloc_pages(GFP_NOWAIT, get_order(MISALIGNED_BUFFER_SIZE)); if (!page) { pr_warn("Can't alloc pages to measure memcpy performance"); @@ -645,9 +648,10 @@ void check_unaligned_access(int cpu) __free_pages(page, get_order(MISALIGNED_BUFFER_SIZE)); } -static int check_unaligned_access_boot_cpu(void) +static int __init check_unaligned_access_boot_cpu(void) { check_unaligned_access(0); + unaligned_emulation_finish(); return 0; } diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c index e600aab116a4..3af6ad4df7cf 100644 --- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include #include diff --git a/arch/riscv/kernel/traps_misaligned.c b/arch/riscv/kernel/traps_misaligned.c index b5fb1ff078e3..fa81f6952fa4 100644 --- a/arch/riscv/kernel/traps_misaligned.c +++ b/arch/riscv/kernel/traps_misaligned.c @@ -9,11 +9,14 @@ #include #include #include +#include #include #include #include #include +#include +#include #define INSN_MATCH_LB 0x3 #define INSN_MASK_LB 0x707f @@ -396,8 +399,10 @@ union reg_data { u64 data_u64; }; +static bool unaligned_ctl __read_mostly; + /* sysctl hooks */ -int unaligned_enabled __read_mostly = 1; /* Enabled by default */ +int unaligned_enabled __read_mostly; int handle_misaligned_load(struct pt_regs *regs) { @@ -412,6 +417,9 @@ int handle_misaligned_load(struct pt_regs *regs) if (!unaligned_enabled) return -1; + if (user_mode(regs) && (current->thread.align_ctl & PR_UNALIGN_SIGBUS)) + return -1; + if (get_insn(regs, epc, &insn)) return -1; @@ -511,6 +519,9 @@ int handle_misaligned_store(struct pt_regs *regs) if (!unaligned_enabled) return -1; + if (user_mode(regs) && (current->thread.align_ctl & PR_UNALIGN_SIGBUS)) + return -1; + if (get_insn(regs, epc, &insn)) return -1; @@ -585,3 +596,53 @@ int handle_misaligned_store(struct pt_regs *regs) return 0; } + +bool check_unaligned_access_emulated(int cpu) +{ + unsigned long emulated = 1, tmp_var; + + /* Use a fixup to detect if misaligned access triggered an exception */ + __asm__ __volatile__ ( + "1:\n" + " "REG_L" %[tmp], 1(%[ptr])\n" + " li %[emulated], 0\n" + "2:\n" + _ASM_EXTABLE(1b, 2b) + : [emulated] "+r" (emulated), [tmp] "=r" (tmp_var) + : [ptr] "r" (&tmp_var) + : "memory"); + + if (!emulated) + return false; + + per_cpu(misaligned_access_speed, cpu) = + RISCV_HWPROBE_MISALIGNED_EMULATED; + + return true; +} + +void __init unaligned_emulation_finish(void) +{ + int cpu; + + /* + * We can only support PR_UNALIGN controls if all CPUs have misaligned + * accesses emulated since tasks requesting such control can run on any + * CPU. + */ + for_each_possible_cpu(cpu) { + if (per_cpu(misaligned_access_speed, cpu) != + RISCV_HWPROBE_MISALIGNED_EMULATED) { + goto out; + } + } + unaligned_ctl = true; + +out: + unaligned_enabled = 1; +} + +bool unaligned_ctl_available(void) +{ + return unaligned_ctl; +} -- 2.40.1