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[73.69.118.222]) by smtp.gmail.com with ESMTPSA id x5sm27493714qtc.43.2018.11.19.13.44.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 19 Nov 2018 13:44:46 -0800 (PST) From: Pavel Tatashin To: catalin.marinas@arm.com, will.deacon@arm.com, akpm@linux-foundation.org, rppt@linux.vnet.ibm.com, mhocko@suse.com, ard.biesheuvel@linaro.org, andrew.murray@arm.com, james.morse@arm.com, marc.zyngier@arm.com, sboyd@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, pasha.tatashin@soleen.com Subject: [PATCH v1 1/1] arm64: Early boot time stamps Date: Mon, 19 Nov 2018 16:44:43 -0500 Message-Id: <20181119214443.25175-2-pasha.tatashin@soleen.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181119214443.25175-1-pasha.tatashin@soleen.com> References: <20181119214443.25175-1-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Allow printk time stamps/sched_clock() to be available from the early boot. Signed-off-by: Pavel Tatashin --- arch/arm64/kernel/setup.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index f4fc1e0544b7..4df41a66b403 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -40,6 +40,7 @@ #include #include #include +#include #include #include @@ -279,8 +280,26 @@ arch_initcall(reserve_memblock_reserved_regions); u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID }; +/* + * Get time stamps available early in boot, useful to identify boot time issues + * from the early boot. + */ +static __init void sched_clock_early_init(void) +{ + u64 freq = arch_timer_get_cntfrq(); + u64 (*read_time)(void) = arch_counter_get_cntvct; + + /* Early clock is available only on platforms with known freqs */ + if (!freq) + return; + + sched_clock_register(read_time, BITS_PER_LONG, freq); +} + void __init setup_arch(char **cmdline_p) { + sched_clock_early_init(); + init_mm.start_code = (unsigned long) _text; init_mm.end_code = (unsigned long) _etext; init_mm.end_data = (unsigned long) _edata; -- 2.19.1