From patchwork Thu Dec 12 18:51:24 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elliot Berman X-Patchwork-Id: 11289173 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 13659109A for ; Thu, 12 Dec 2019 18:51:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C85782464B for ; Thu, 12 Dec 2019 18:51:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="H/FVd886"; dkim=pass (1024-bit key) header.d=amazonses.com header.i=@amazonses.com header.b="Ib+gVQ9W" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730691AbfLLSvi (ORCPT ); Thu, 12 Dec 2019 13:51:38 -0500 Received: from a27-18.smtp-out.us-west-2.amazonses.com ([54.240.27.18]:39284 "EHLO a27-18.smtp-out.us-west-2.amazonses.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730688AbfLLSvZ (ORCPT ); Thu, 12 Dec 2019 13:51:25 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=zsmsymrwgfyinv5wlfyidntwsjeeldzt; d=codeaurora.org; t=1576176684; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; bh=MirJA0v7lGICf52JDfcFqU6v/FyaNOnqWSn0MPZGtMw=; b=H/FVd886NSDU5UHSaqCaOp/2zAUP2j9RHp1qkyS4pJPquUm6+dGaGOHMwbfhWIBg hYih8pOTimFtnNIFGcqgOYmX1jsO7S7Z/OiqnjwMTlpo0Syhwrz6d+ALSpgIhQ1wlMP NC9npeZqfMvtJOdaQXk1MVbxl4vEXzFCBznyIJ+c= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=gdwg2y3kokkkj5a55z2ilkup5wp5hhxx; d=amazonses.com; t=1576176684; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References:Feedback-ID; bh=MirJA0v7lGICf52JDfcFqU6v/FyaNOnqWSn0MPZGtMw=; b=Ib+gVQ9WKzQM4g5ScILFcmLluKYk3E72ND8JCkF3cWUDSW92rpqAm+BdE2WRZu4U cCV0B58DTFL0rRggV525hruyZK9RCYxenXU/Rc65fedoI+OCLKOKFrk0wyI06gfscFG nxSLvWoc/dbLiC64zs4696/0+IhxZ9VDrRx9bqQk= X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.0 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org DB9D2C447A2 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=eberman@codeaurora.org From: Elliot Berman To: bjorn.andersson@linaro.org, agross@kernel.org, swboyd@chromium.org Cc: Elliot Berman , saiprakash.ranjan@codeaurora.org, tsoni@codeaurora.org, sidgup@codeaurora.org, psodagud@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 17/17] firmware: qcom_scm: Dynamically support SMCCC and legacy conventions Date: Thu, 12 Dec 2019 18:51:24 +0000 Message-ID: <0101016efb738cea-f84e3fa3-3962-4389-9d6a-c1ae29cf4aa0-000000@us-west-2.amazonses.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1576176651-17089-1-git-send-email-eberman@codeaurora.org> References: <1576176651-17089-1-git-send-email-eberman@codeaurora.org> X-SES-Outgoing: 2019.12.12-54.240.27.18 Feedback-ID: 1.us-west-2.CZuq2qbDmUIuT3qdvXlRHZZCpfZqZ4GtG9v3VKgRyF0=:AmazonSES Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Dynamically support SMCCCC and legacy conventions by detecting which convention to use at runtime. qcom_scm_call_atomic and qcom_scm_call can then be moved in qcom_scm.c and use underlying convention backend as appropriate. Thus, rename qcom_scm-64,-32 to reflect that they are backends for -smc and -legacy, respectively. Also add support for making SCM calls earlier than when SCM driver probes to support use cases such as qcom_scm_set_cold_boot_addr. Support is added by lazily initializing the convention and guarding the query with a spin lock. The limitation of these early SCM calls is that they cannot use DMA, as in the case of >4 arguments for SMC convention and any non-atomic call for legacy convention. Signed-off-by: Elliot Berman --- drivers/firmware/Kconfig | 8 -- drivers/firmware/Makefile | 4 +- .../firmware/{qcom_scm-32.c => qcom_scm-legacy.c} | 31 +---- drivers/firmware/{qcom_scm-64.c => qcom_scm-smc.c} | 95 +------------- drivers/firmware/qcom_scm.c | 146 ++++++++++++++++++++- drivers/firmware/qcom_scm.h | 27 +++- 6 files changed, 176 insertions(+), 135 deletions(-) rename drivers/firmware/{qcom_scm-32.c => qcom_scm-legacy.c} (90%) rename drivers/firmware/{qcom_scm-64.c => qcom_scm-smc.c} (57%) diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig index e40a77b..ea869ad 100644 --- a/drivers/firmware/Kconfig +++ b/drivers/firmware/Kconfig @@ -239,14 +239,6 @@ config QCOM_SCM depends on ARM || ARM64 select RESET_CONTROLLER -config QCOM_SCM_32 - def_bool y - depends on QCOM_SCM && ARM - -config QCOM_SCM_64 - def_bool y - depends on QCOM_SCM && ARM64 - config QCOM_SCM_DOWNLOAD_MODE_DEFAULT bool "Qualcomm download mode enabled by default" depends on QCOM_SCM diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile index 747fb73..e9fb838 100644 --- a/drivers/firmware/Makefile +++ b/drivers/firmware/Makefile @@ -17,9 +17,7 @@ obj-$(CONFIG_ISCSI_IBFT) += iscsi_ibft.o obj-$(CONFIG_FIRMWARE_MEMMAP) += memmap.o obj-$(CONFIG_RASPBERRYPI_FIRMWARE) += raspberrypi.o obj-$(CONFIG_FW_CFG_SYSFS) += qemu_fw_cfg.o -obj-$(CONFIG_QCOM_SCM) += qcom_scm.o -obj-$(CONFIG_QCOM_SCM_64) += qcom_scm-64.o -obj-$(CONFIG_QCOM_SCM_32) += qcom_scm-32.o +obj-$(CONFIG_QCOM_SCM) += qcom_scm.o qcom_scm-smc.o qcom_scm-legacy.o obj-$(CONFIG_TI_SCI_PROTOCOL) += ti_sci.o obj-$(CONFIG_TRUSTED_FOUNDATIONS) += trusted_foundations.o obj-$(CONFIG_TURRIS_MOX_RWTM) += turris-mox-rwtm.o diff --git a/drivers/firmware/qcom_scm-32.c b/drivers/firmware/qcom_scm-legacy.c similarity index 90% rename from drivers/firmware/qcom_scm-32.c rename to drivers/firmware/qcom_scm-legacy.c index 08220e7..8532e7c 100644 --- a/drivers/firmware/qcom_scm-32.c +++ b/drivers/firmware/qcom_scm-legacy.c @@ -26,7 +26,6 @@ struct arm_smccc_args { unsigned long args[8]; }; -#define SCM_LEGACY_FNID(s, c) (((s) << 10) | ((c) & 0x3ff)) /** * struct scm_legacy_command - one SCM command buffer @@ -129,8 +128,8 @@ static void __scm_legacy_do(const struct arm_smccc_args *smc, * and response buffers is taken care of by qcom_scm_call; however, callers are * responsible for any other cached buffers passed over to the secure world. */ -int qcom_scm_call(struct device *dev, const struct qcom_scm_desc *desc, - struct qcom_scm_res *res) +int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc, + struct qcom_scm_res *res) { u8 arglen = desc->arginfo & 0xf; int ret = 0, context_id; @@ -218,9 +217,9 @@ int qcom_scm_call(struct device *dev, const struct qcom_scm_desc *desc, * This shall only be used with commands that are guaranteed to be * uninterruptable, atomic and SMP safe. */ -int qcom_scm_call_atomic(struct device *unused, - const struct qcom_scm_desc *desc, - struct qcom_scm_res *res) +int scm_legacy_call_atomic(struct device *unused, + const struct qcom_scm_desc *desc, + struct qcom_scm_res *res) { int context_id; struct arm_smccc_res smc_res; @@ -241,23 +240,3 @@ int qcom_scm_call_atomic(struct device *unused, return smc_res.a0; } - -int __qcom_scm_is_call_available(struct device *dev, u32 svc_id, u32 cmd_id) -{ - int ret; - struct qcom_scm_desc desc = { - .svc = QCOM_SCM_SVC_INFO, - .cmd = QCOM_SCM_INFO_IS_CALL_AVAIL, - .args[0] = SCM_LEGACY_FNID(svc_id, cmd_id), - .arginfo = QCOM_SCM_ARGS(1), - }; - struct qcom_scm_res res; - - ret = qcom_scm_call(dev, &desc, &res); - - return ret ? : res.result[0]; -} - -void __qcom_scm_init(void) -{ -} diff --git a/drivers/firmware/qcom_scm-64.c b/drivers/firmware/qcom_scm-smc.c similarity index 57% rename from drivers/firmware/qcom_scm-64.c rename to drivers/firmware/qcom_scm-smc.c index 4defc7c..497c13b 100644 --- a/drivers/firmware/qcom_scm-64.c +++ b/drivers/firmware/qcom_scm-smc.c @@ -14,8 +14,6 @@ #include "qcom_scm.h" -#define SCM_SMC_FNID(s, c) ((((s) & 0xFF) << 8) | ((c) & 0xFF)) - /** * struct arm_smccc_args * @args: The array of values used in registers in smc instruction @@ -24,7 +22,6 @@ struct arm_smccc_args { unsigned long args[8]; }; -static u64 qcom_smccc_convention = -1; static DEFINE_MUTEX(qcom_scm_lock); #define QCOM_SCM_EBUSY_WAIT_MS 30 @@ -80,8 +77,8 @@ static void __scm_smc_do(const struct arm_smccc_args *smc, } while (res->a0 == QCOM_SCM_V2_EBUSY); } -static int __scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc, - struct qcom_scm_res *res, bool atomic) +int scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc, + struct qcom_scm_res *res, bool atomic) { int arglen = desc->arginfo & 0xf; int i; @@ -90,6 +87,9 @@ static int __scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc, size_t alloc_len; gfp_t flag = atomic ? GFP_ATOMIC : GFP_KERNEL; u32 smccc_call_type = atomic ? ARM_SMCCC_FAST_CALL : ARM_SMCCC_STD_CALL; + u32 qcom_smccc_convention = + (qcom_scm_convention == SMC_CONVENTION_ARM_32) ? + ARM_SMCCC_SMC_32 : ARM_SMCCC_SMC_64; struct arm_smccc_res smc_res; struct arm_smccc_args smc = {0}; @@ -149,88 +149,3 @@ static int __scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc, return (long)smc_res.a0 ? qcom_scm_remap_error(smc_res.a0) : 0; } - -/** - * qcom_scm_call() - Invoke a syscall in the secure world - * @dev: device - * @svc_id: service identifier - * @cmd_id: command identifier - * @desc: Descriptor structure containing arguments and return values - * - * Sends a command to the SCM and waits for the command to finish processing. - * This should *only* be called in pre-emptible context. - */ -int qcom_scm_call(struct device *dev, const struct qcom_scm_desc *desc, - struct qcom_scm_res *res) -{ - might_sleep(); - return __scm_smc_call(dev, desc, res, false); -} - -/** - * qcom_scm_call_atomic() - atomic variation of qcom_scm_call() - * @dev: device - * @svc_id: service identifier - * @cmd_id: command identifier - * @desc: Descriptor structure containing arguments and return values - * @res: Structure containing results from SMC/HVC call - * - * Sends a command to the SCM and waits for the command to finish processing. - * This can be called in atomic context. - */ -int qcom_scm_call_atomic(struct device *dev, const struct qcom_scm_desc *desc, - struct qcom_scm_res *res) -{ - return __scm_smc_call(dev, desc, res, true); -} - -int __qcom_scm_is_call_available(struct device *dev, u32 svc_id, u32 cmd_id) -{ - int ret; - struct qcom_scm_desc desc = { - .svc = QCOM_SCM_SVC_INFO, - .cmd = QCOM_SCM_INFO_IS_CALL_AVAIL, - .owner = ARM_SMCCC_OWNER_SIP, - }; - struct qcom_scm_res res; - - desc.arginfo = QCOM_SCM_ARGS(1); - desc.args[0] = SCM_SMC_FNID(svc_id, cmd_id) | - (ARM_SMCCC_OWNER_SIP << ARM_SMCCC_OWNER_SHIFT); - - ret = qcom_scm_call(dev, &desc, &res); - - return ret ? : res.result[0]; -} - -void __qcom_scm_init(void) -{ - struct qcom_scm_desc desc = { - .svc = QCOM_SCM_SVC_INFO, - .cmd = QCOM_SCM_INFO_IS_CALL_AVAIL, - .args[0] = SCM_SMC_FNID(QCOM_SCM_SVC_INFO, - QCOM_SCM_INFO_IS_CALL_AVAIL) | - (ARM_SMCCC_OWNER_SIP << ARM_SMCCC_OWNER_SHIFT), - .arginfo = QCOM_SCM_ARGS(1), - .owner = ARM_SMCCC_OWNER_SIP, - }; - struct qcom_scm_res res; - int ret; - - qcom_smccc_convention = ARM_SMCCC_SMC_64; - // Device isn't required as there is only one argument - no device - // needed to dma_map_single to secure world - ret = qcom_scm_call_atomic(NULL, &desc, &res); - if (!ret && res.result[0] == 1) - goto out; - - qcom_smccc_convention = ARM_SMCCC_SMC_32; - ret = qcom_scm_call_atomic(NULL, &desc, &res); - if (!ret && res.result[0] == 1) - goto out; - - qcom_smccc_convention = -1; - BUG(); -out: - pr_info("QCOM SCM SMC Convention: %lld\n", qcom_smccc_convention); -} diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c index b29e6c1..77da9e6 100644 --- a/drivers/firmware/qcom_scm.c +++ b/drivers/firmware/qcom_scm.c @@ -72,6 +72,13 @@ static struct qcom_scm_wb_entry qcom_scm_wb[] = { { .flag = QCOM_SCM_FLAG_WARMBOOT_CPU3 }, }; +static const char *qcom_scm_convention_names[] = { + [SMC_CONVENTION_UNKNOWN] = "unknown", + [SMC_CONVENTION_ARM_32] = "smc arm 32", + [SMC_CONVENTION_ARM_64] = "smc arm 64", + [SMC_CONVENTION_LEGACY] = "smc legacy", +}; + static struct qcom_scm *__scm; static int qcom_scm_clk_enable(void) @@ -107,6 +114,143 @@ static void qcom_scm_clk_disable(void) clk_disable_unprepare(__scm->bus_clk); } +static int __qcom_scm_is_call_available(struct device *dev, u32 svc_id, + u32 cmd_id); + +enum qcom_scm_convention qcom_scm_convention; +static bool has_queried __read_mostly; +static DEFINE_SPINLOCK(query_lock); + +static void __query_convention(void) +{ + unsigned long flags; + struct qcom_scm_desc desc = { + .svc = QCOM_SCM_SVC_INFO, + .cmd = QCOM_SCM_INFO_IS_CALL_AVAIL, + .args[0] = SCM_SMC_FNID(QCOM_SCM_SVC_INFO, + QCOM_SCM_INFO_IS_CALL_AVAIL) | + (ARM_SMCCC_OWNER_SIP << ARM_SMCCC_OWNER_SHIFT), + .arginfo = QCOM_SCM_ARGS(1), + .owner = ARM_SMCCC_OWNER_SIP, + }; + struct qcom_scm_res res; + int ret; + + spin_lock_irqsave(&query_lock, flags); + if (has_queried) + goto out; + + qcom_scm_convention = SMC_CONVENTION_ARM_64; + // Device isn't required as there is only one argument - no device + // needed to dma_map_single to secure world + ret = scm_smc_call(NULL, &desc, &res, true); + if (!ret && res.result[0] == 1) + goto out; + + qcom_scm_convention = SMC_CONVENTION_ARM_32; + ret = scm_smc_call(NULL, &desc, &res, true); + if (!ret && res.result[0] == 1) + goto out; + + qcom_scm_convention = SMC_CONVENTION_LEGACY; +out: + has_queried = true; + spin_unlock_irqrestore(&query_lock, flags); + pr_info("qcom_scm: convention: %s\n", + qcom_scm_convention_names[qcom_scm_convention]); +} + +static inline enum qcom_scm_convention __get_convention(void) +{ + if (unlikely(!has_queried)) + __query_convention(); + return qcom_scm_convention; +} + +/** + * qcom_scm_call() - Invoke a syscall in the secure world + * @dev: device + * @svc_id: service identifier + * @cmd_id: command identifier + * @desc: Descriptor structure containing arguments and return values + * + * Sends a command to the SCM and waits for the command to finish processing. + * This should *only* be called in pre-emptible context. + */ +static int qcom_scm_call(struct device *dev, const struct qcom_scm_desc *desc, + struct qcom_scm_res *res) +{ + might_sleep(); + switch (__get_convention()) { + case SMC_CONVENTION_ARM_32: + case SMC_CONVENTION_ARM_64: + return scm_smc_call(dev, desc, res, false); + case SMC_CONVENTION_LEGACY: + return scm_legacy_call(dev, desc, res); + default: + pr_err("Unknown current SCM calling convention.\n"); + return -EINVAL; + } +} + +/** + * qcom_scm_call_atomic() - atomic variation of qcom_scm_call() + * @dev: device + * @svc_id: service identifier + * @cmd_id: command identifier + * @desc: Descriptor structure containing arguments and return values + * @res: Structure containing results from SMC/HVC call + * + * Sends a command to the SCM and waits for the command to finish processing. + * This can be called in atomic context. + */ +static int qcom_scm_call_atomic(struct device *dev, + const struct qcom_scm_desc *desc, + struct qcom_scm_res *res) +{ + switch (__get_convention()) { + case SMC_CONVENTION_ARM_32: + case SMC_CONVENTION_ARM_64: + return scm_smc_call(dev, desc, res, true); + case SMC_CONVENTION_LEGACY: + return scm_legacy_call_atomic(dev, desc, res); + default: + pr_err("Unknown current SCM calling convention.\n"); + return -EINVAL; + } +} + +static int __qcom_scm_is_call_available(struct device *dev, u32 svc_id, + u32 cmd_id) +{ + int ret; + struct qcom_scm_desc desc = { + .svc = QCOM_SCM_SVC_INFO, + .cmd = QCOM_SCM_INFO_IS_CALL_AVAIL, + .owner = ARM_SMCCC_OWNER_SIP, + }; + struct qcom_scm_res res; + + desc.arginfo = QCOM_SCM_ARGS(1); + switch (__get_convention()) { + case SMC_CONVENTION_ARM_32: + case SMC_CONVENTION_ARM_64: + desc.args[0] = SCM_SMC_FNID(svc_id, cmd_id) | + (ARM_SMCCC_OWNER_SIP << ARM_SMCCC_OWNER_SHIFT); + break; + case SMC_CONVENTION_LEGACY: + desc.args[0] = SCM_LEGACY_FNID(svc_id, cmd_id); + break; + default: + pr_err("Unknown SMC convention being used\n"); + return -EINVAL; + } + + ret = qcom_scm_call(dev, &desc, &res); + + return ret ? : res.result[0]; +} + /** * qcom_scm_set_warm_boot_addr() - Set the warm boot address for cpus * @entry: Entry point function for the cpus @@ -969,7 +1113,7 @@ static int qcom_scm_probe(struct platform_device *pdev) __scm = scm; __scm->dev = &pdev->dev; - __qcom_scm_init(); + __query_convention(); /* * If requested enable "download mode", from this point on warmboot diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h index 9b7b357..d9ed670 100644 --- a/drivers/firmware/qcom_scm.h +++ b/drivers/firmware/qcom_scm.h @@ -3,6 +3,16 @@ */ #ifndef __QCOM_SCM_INT_H #define __QCOM_SCM_INT_H + +enum qcom_scm_convention { + SMC_CONVENTION_UNKNOWN, + SMC_CONVENTION_LEGACY, + SMC_CONVENTION_ARM_32, + SMC_CONVENTION_ARM_64, +}; + +extern enum qcom_scm_convention qcom_scm_convention; + #define MAX_QCOM_SCM_ARGS 10 #define MAX_QCOM_SCM_RETS 3 @@ -50,11 +60,16 @@ struct qcom_scm_res { u64 result[MAX_QCOM_SCM_RETS]; }; -extern int qcom_scm_call(struct device *dev, const struct qcom_scm_desc *desc, - struct qcom_scm_res *res); -extern int qcom_scm_call_atomic(struct device *dev, - const struct qcom_scm_desc *desc, - struct qcom_scm_res *res); +#define SCM_SMC_FNID(s, c) ((((s) & 0xFF) << 8) | ((c) & 0xFF)) +extern int scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc, + struct qcom_scm_res *res, bool atomic); + +#define SCM_LEGACY_FNID(s, c) (((s) << 10) | ((c) & 0x3ff)) +extern int scm_legacy_call_atomic(struct device *dev, + const struct qcom_scm_desc *desc, + struct qcom_scm_res *res); +extern int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc, + struct qcom_scm_res *res); #define QCOM_SCM_SVC_BOOT 0x01 #define QCOM_SCM_BOOT_SET_ADDR 0x01 @@ -77,8 +92,6 @@ extern int qcom_scm_call_atomic(struct device *dev, #define QCOM_SCM_SVC_INFO 0x06 #define QCOM_SCM_INFO_IS_CALL_AVAIL 0x01 -extern int __qcom_scm_is_call_available(struct device *dev, u32 svc_id, - u32 cmd_id); #define QCOM_SCM_SVC_MP 0x0c #define QCOM_SCM_MP_RESTORE_SEC_CFG 0x02