From patchwork Mon Aug 19 13:19:09 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13768348 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4278016D33E; Mon, 19 Aug 2024 13:20:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724073601; cv=none; b=IyZTBmO39wfSfmFpRltqY5al/UpnOHTZVViA0vD04ZbpQo2CSZDqeeCvY9nnWmrwuJyZN42sSWZXggVIk6wShe+gJcfPCPABDKBjqiTPt6ppDqqeqcNFbE3xdeGU/SJAxwQF7rSlHOoypJK/TPBweckmKSJJJU2Mo5vnOAvnyQw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724073601; c=relaxed/simple; bh=sGP6LPmkwqwf/MUAO6MKlNTjTOPIr6zL5P31Exl3W2Q=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Y3aomtChzczXkITDUgVG9LaDGu8fadPsGenC/X4qwBn0QO6gTWQhKFMfebfkwuyHzbankp/9WaQC5shJQgf2sgG+dgfPc7t4Y493loykxCQLg7FAYa4g7oA8qnim/Im6IPrPWj1sz7Oa81P2MXDXOF8q/W35EP9yvzTqqErrw2s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id BCDE9113E; Mon, 19 Aug 2024 06:20:25 -0700 (PDT) Received: from e122027.arm.com (unknown [10.57.85.21]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C20DC3F73B; Mon, 19 Aug 2024 06:19:55 -0700 (PDT) From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Steven Price , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Gavin Shan , Shanker Donthineni , Alper Gun , Jean-Philippe Brucker Subject: [PATCH v5 04/19] firmware/psci: Add psci_early_test_conduit() Date: Mon, 19 Aug 2024 14:19:09 +0100 Message-Id: <20240819131924.372366-5-steven.price@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240819131924.372366-1-steven.price@arm.com> References: <20240819131924.372366-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Jean-Philippe Brucker Add a function to test early if PSCI is present and what conduit it uses. Because the PSCI conduit corresponds to the SMCCC one, this will let the kernel know whether it can use SMC instructions to discuss with the Realm Management Monitor (RMM), early enough to enable RAM and serial access when running in a Realm. Signed-off-by: Jean-Philippe Brucker Signed-off-by: Steven Price Reviewed-by: Catalin Marinas --- v4: New patch --- drivers/firmware/psci/psci.c | 25 +++++++++++++++++++++++++ include/linux/psci.h | 5 +++++ 2 files changed, 30 insertions(+) diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c index 2328ca58bba6..2b308f97ef2c 100644 --- a/drivers/firmware/psci/psci.c +++ b/drivers/firmware/psci/psci.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -769,6 +770,30 @@ int __init psci_dt_init(void) return ret; } +/* + * Test early if PSCI is supported, and if its conduit matches @conduit + */ +bool __init psci_early_test_conduit(enum arm_smccc_conduit conduit) +{ + int len; + int psci_node; + const char *method; + unsigned long dt_root; + + /* DT hasn't been unflattened yet, we have to work with the flat blob */ + dt_root = of_get_flat_dt_root(); + psci_node = of_get_flat_dt_subnode_by_name(dt_root, "psci"); + if (psci_node <= 0) + return false; + + method = of_get_flat_dt_prop(psci_node, "method", &len); + if (!method) + return false; + + return (conduit == SMCCC_CONDUIT_SMC && strncmp(method, "smc", len) == 0) || + (conduit == SMCCC_CONDUIT_HVC && strncmp(method, "hvc", len) == 0); +} + #ifdef CONFIG_ACPI /* * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's diff --git a/include/linux/psci.h b/include/linux/psci.h index 4ca0060a3fc4..a1fc1703ba20 100644 --- a/include/linux/psci.h +++ b/include/linux/psci.h @@ -45,8 +45,13 @@ struct psci_0_1_function_ids get_psci_0_1_function_ids(void); #if defined(CONFIG_ARM_PSCI_FW) int __init psci_dt_init(void); +bool __init psci_early_test_conduit(enum arm_smccc_conduit conduit); #else static inline int psci_dt_init(void) { return 0; } +static inline bool psci_early_test_conduit(enum arm_smccc_conduit conduit) +{ + return false; +} #endif #if defined(CONFIG_ARM_PSCI_FW) && defined(CONFIG_ACPI)