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From: "Suzuki K. Poulose" <suzuki.poulose@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: marc.zyngier@arm.com, will.deacon@arm.com, mark.rutland@arm.com,
	catalin.marinas@arm.com, steve.capper@linaro.org,
	linux-kernel@vger.kernel.org, andre.przywara@arm.com,
	dave.martin@arm.com, Vladimir.Murzin@arm.com,
	james.morse@arm.com, ard.biesheuvel@linaro.org,
	edward.nevill@linaro.org, aph@redhat.com,
	"Suzuki K. Poulose" <suzuki.poulose@arm.com>
Subject: [PATCH v2 09/22] arm64: Read system wide CPUID value
Date: Mon,  5 Oct 2015 18:01:58 +0100	[thread overview]
Message-ID: <1444064531-25607-10-git-send-email-suzuki.poulose@arm.com> (raw)
In-Reply-To: <1444064531-25607-1-git-send-email-suzuki.poulose@arm.com>

Add an API for reading the safe CPUID value across the
system from the new infrastructure.

Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
---
 arch/arm64/include/asm/cpufeature.h |    2 ++
 arch/arm64/kernel/cpufeature.c      |    9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index 7ed92f2..2e17f9b 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -145,6 +145,8 @@ void check_local_cpu_features(void);
 bool cpu_supports_mixed_endian_el0(void);
 bool system_supports_mixed_endian_el0(void);
 
+u64 read_system_reg(u32 id);
+
 #endif /* __ASSEMBLY__ */
 
 #endif
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index b5dd450..a4eff72 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -594,6 +594,15 @@ void update_cpu_features(int cpu,
 	update_mixed_endian_el0_support(info);
 }
 
+u64 read_system_reg(u32 id)
+{
+	struct arm64_ftr_reg *regp = get_arm64_sys_reg(id);
+
+	/* We shouldn't get a request for an unsupported register */
+	BUG_ON(!regp);
+	return regp->sys_val;
+}
+
 static bool
 feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry)
 {
-- 
1.7.9.5


  parent reply	other threads:[~2015-10-05 17:06 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-05 17:01 [PATCH v2 00/22] arm64: Consolidate CPU feature handling Suzuki K. Poulose
2015-10-05 17:01 ` [PATCH v2 01/22] arm64: Make the CPU information more clear Suzuki K. Poulose
2015-10-05 17:01 ` [PATCH v2 02/22] arm64: Delay ELF HWCAP initialisation until all CPUs are up Suzuki K. Poulose
2015-10-05 17:01 ` [PATCH v2 03/22] arm64: Move cpu feature detection code Suzuki K. Poulose
2015-10-05 17:01 ` [PATCH v2 04/22] arm64: Move mixed endian support detection Suzuki K. Poulose
2015-10-05 17:01 ` [PATCH v2 05/22] arm64: Move /proc/cpuinfo handling code Suzuki K. Poulose
2015-10-05 17:01 ` [PATCH v2 06/22] arm64: sys_reg: Define System register encoding Suzuki K. Poulose
2015-10-07 16:36   ` Catalin Marinas
2015-10-07 17:03     ` Suzuki K. Poulose
2015-10-08 14:43       ` Catalin Marinas
2015-10-08 16:13         ` Suzuki K. Poulose
2015-10-05 17:01 ` [PATCH v2 07/22] arm64: Keep track of CPU feature registers Suzuki K. Poulose
2015-10-07 17:16   ` Catalin Marinas
2015-10-08  9:55     ` Suzuki K. Poulose
2015-10-08 15:03       ` Catalin Marinas
2015-10-09 13:00         ` Suzuki K. Poulose
2015-10-12 17:01         ` Suzuki K. Poulose
2015-10-12 17:21           ` Mark Rutland
2015-10-13  9:40             ` Catalin Marinas
2015-10-09 10:56       ` Suzuki K. Poulose
2015-10-09 14:16         ` Catalin Marinas
2015-10-05 17:01 ` [PATCH v2 08/22] arm64: Consolidate CPU Sanity check to CPU Feature infrastructure Suzuki K. Poulose
2015-10-05 17:01 ` Suzuki K. Poulose [this message]
2015-10-05 17:01 ` [PATCH v2 10/22] arm64: Cleanup mixed endian support detection Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 11/22] arm64: Populate cpuinfo after notify_cpu_starting Suzuki K. Poulose
2015-10-08 10:15   ` Catalin Marinas
2015-10-08 10:46     ` Suzuki K. Poulose
2015-10-09 15:01       ` Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 12/22] arm64: Delay cpu feature checks Suzuki K. Poulose
2015-10-06  4:41   ` kbuild test robot
2015-10-06 11:09     ` Suzuki K. Poulose
2015-10-08 11:08   ` Catalin Marinas
2015-10-13 10:12     ` Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 13/22] arm64: Make use of system wide capability checks Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 14/22] arm64: Cleanup HWCAP handling Suzuki K. Poulose
2015-10-08 11:10   ` Catalin Marinas
2015-10-08 11:17     ` Russell King - ARM Linux
2015-10-08 13:00       ` Catalin Marinas
2015-10-08 14:54         ` Edward Nevill
2015-10-05 17:02 ` [PATCH v2 15/22] arm64: Move FP/ASIMD hwcap handling to common code Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 16/22] arm64/debug: Make use of the system wide safe value Suzuki K. Poulose
2015-10-08 11:11   ` Catalin Marinas
2015-10-08 11:56     ` Suzuki K. Poulose
2015-10-08 15:08       ` Catalin Marinas
2015-10-08 15:57         ` Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 17/22] arm64/kvm: Make use of the system wide safe values Suzuki K. Poulose
2015-10-10 15:17   ` Christoffer Dall
2015-10-05 17:02 ` [PATCH v2 18/22] arm64: Add helper to decode register from instruction Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 19/22] arm64: cpufeature: Track the user visible fields Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 20/22] arm64: Expose feature registers by emulating MRS Suzuki K. Poulose
2015-10-05 17:02 ` [PATCH v2 21/22] arm64: cpuinfo: Expose MIDR_EL1 and REVIDR_EL1 to sysfs Suzuki K. Poulose
2015-10-06  9:09   ` Russell King - ARM Linux
2015-10-06 10:18     ` Steve Capper
2015-10-06 10:25       ` Mark Rutland
2015-10-06 10:29         ` Steve Capper
2015-10-06 19:16       ` Russell King - ARM Linux
2015-10-05 17:02 ` [PATCH v2 22/22] arm64: feature registers: Documentation Suzuki K. Poulose

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