From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Jonas Bonn <jonas@southpole.se>, Sasha Levin <sashal@kernel.org>,
"Jason A. Donenfeld" <Jason@zx2c4.com>,
Arnd Bergmann <arnd@arndb.de>,
rdunlap@infradead.org, linux@dominikbrodowski.net,
openrisc@lists.librecores.org,
Thomas Gleixner <tglx@linutronix.de>,
Guenter Roeck <linux@roeck-us.net>
Subject: [PATCH AUTOSEL 4.14 22/29] openrisc: start CPU timer early in boot
Date: Mon, 30 May 2022 09:50:49 -0400 [thread overview]
Message-ID: <20220530135057.1937286-22-sashal@kernel.org> (raw)
In-Reply-To: <20220530135057.1937286-1-sashal@kernel.org>
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
[ Upstream commit 516dd4aacd67a0f27da94f3fe63fe0f4dbab6e2b ]
In order to measure the boot process, the timer should be switched on as
early in boot as possible. As well, the commit defines the get_cycles
macro, like the previous patches in this series, so that generic code is
aware that it's implemented by the platform, as is done on other archs.
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Acked-by: Stafford Horne <shorne@gmail.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/openrisc/include/asm/timex.h | 1 +
arch/openrisc/kernel/head.S | 9 +++++++++
2 files changed, 10 insertions(+)
diff --git a/arch/openrisc/include/asm/timex.h b/arch/openrisc/include/asm/timex.h
index 9935cad1b9b9..34d015bf0462 100644
--- a/arch/openrisc/include/asm/timex.h
+++ b/arch/openrisc/include/asm/timex.h
@@ -27,6 +27,7 @@ static inline cycles_t get_cycles(void)
{
return mfspr(SPR_TTCR);
}
+#define get_cycles get_cycles
/* This isn't really used any more */
#define CLOCK_TICK_RATE 1000
diff --git a/arch/openrisc/kernel/head.S b/arch/openrisc/kernel/head.S
index 4d878d13b860..3f1e9d168710 100644
--- a/arch/openrisc/kernel/head.S
+++ b/arch/openrisc/kernel/head.S
@@ -459,6 +459,15 @@ _start:
l.ori r3,r0,0x1
l.mtspr r0,r3,SPR_SR
+ /*
+ * Start the TTCR as early as possible, so that the RNG can make use of
+ * measurements of boot time from the earliest opportunity. Especially
+ * important is that the TTCR does not return zero by the time we reach
+ * rand_initialize().
+ */
+ l.movhi r3,hi(SPR_TTMR_CR)
+ l.mtspr r0,r3,SPR_TTMR
+
CLEAR_GPR(r1)
CLEAR_GPR(r2)
CLEAR_GPR(r3)
--
2.35.1
parent reply other threads:[~2022-05-30 13:51 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20220530135057.1937286-1-sashal@kernel.org>]
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