From nobody Thu Dec 18 18:03:44 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7CA44C5AD4C for ; Mon, 20 Nov 2023 13:21:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232732AbjKTNVi (ORCPT ); Mon, 20 Nov 2023 08:21:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34278 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232135AbjKTNVc (ORCPT ); Mon, 20 Nov 2023 08:21:32 -0500 Received: from mail-wm1-x334.google.com (mail-wm1-x334.google.com [IPv6:2a00:1450:4864:20::334]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9FD0E186 for ; Mon, 20 Nov 2023 05:21:28 -0800 (PST) Received: by mail-wm1-x334.google.com with SMTP id 5b1f17b1804b1-4083dbc43cfso13087535e9.3 for ; Mon, 20 Nov 2023 05:21:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20230601.gappssmtp.com; s=20230601; t=1700486487; x=1701091287; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=BazhM/BZ03YE7Yt2JlSm/CTHrHyW7p3eEne03QtvrUU=; b=FCkZcHWkdl8nq2B09XOxJcXpdDL6TFmvWFR1nSJsX21yxJ0cXjkI95uJi3aGBrD82S +9Cb+zLiY9uNnQWu3yhTm6AYQVgUmjAkkLGcFHifUFFCvyB2vVJHw+dwuL4h7m5CU//2 t0RTd2cyE1EALA1D1DUoLzmbo0prHRHkXwfAQUu7M2D14fXxhiBJSZRSBr/KPbuZF5JT tcAp3b9Oq6JdYtBs0VqjKFQyGlpRqt9Cbtt3KhYcjcNOtxxhPK9fYwdbf7Yqs8ilKsPQ CRzVYsbaGNNJyz534VkVojp1I9WBm+erO2tUglIAJV++D08ifyQ60oSvlMQfVfs1t+NY 0rhw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700486487; x=1701091287; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=BazhM/BZ03YE7Yt2JlSm/CTHrHyW7p3eEne03QtvrUU=; b=l+XUzH8SkSODrUkLHUCr+QM7AWm40nr1nWA6g6CHrFDJd3kHJK2HGxpGfxLxFRjlMb /k9Jol2tuocOQN/d+iq0twesRRXo7+Es5+Ub4pZtT1tv4klJ0VyR23pQyS+9grmjWwwL y+4Z92qBv/1LAyQS2Mc4OkXDZ0OddYnlCPoUUDqXbco5PKhSq3vwOkNKiMCXiqqu5epB 9plXdicsULLg/LAI+8hEla410sHYnLWkFeyhKzFMdtkHp0rD0n5XWHRYb8pFqX9Yoqrp lo7yHx/eqxlKRq1XVIJ1j1tbHjiODGzlvsuPWtOPX2wx1AGAlmgyOPeMuz6nr9plrqBi Vlpw== X-Gm-Message-State: AOJu0Yw8OYEEIQ22YOSnza5WP5tSe9M3ENElvNne94ulsZqUAsoyt9by rRq6Cfks/P0pJuF2/wN71K3wF0lcLEboUKk0/t8= X-Google-Smtp-Source: AGHT+IGqp3soO0FZm0RgdNiXSHhxG0m7AnvMFz2QFxG1h6Gyy6rPMhxdNSgWtKX3O7/jkcPNOBgI3A== X-Received: by 2002:a05:600c:4ecc:b0:406:5344:4212 with SMTP id g12-20020a05600c4ecc00b0040653444212mr5553894wmq.41.1700486487129; Mon, 20 Nov 2023 05:21:27 -0800 (PST) Received: from brgl-uxlite.home ([2a01:cb1d:334:ac00:c590:a7ce:883:eba3]) by smtp.gmail.com with ESMTPSA id k18-20020a05600c0b5200b004065e235417sm17329192wmr.21.2023.11.20.05.21.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Nov 2023 05:21:26 -0800 (PST) From: Bartosz Golaszewski To: Andy Gross , Bjorn Andersson , Konrad Dybcio , Elliot Berman , Krzysztof Kozlowski , Guru Das Srinagesh , Andrew Halaney , Maximilian Luz , Alex Elder , Srini Kandagatla Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel@quicinc.com, Bartosz Golaszewski Subject: [RESEND PATCH v5 03/12] firmware: qcom: scm: smc: switch to using the SCM allocator Date: Mon, 20 Nov 2023 14:21:09 +0100 Message-Id: <20231120132118.30473-4-brgl@bgdev.pl> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20231120132118.30473-1-brgl@bgdev.pl> References: <20231120132118.30473-1-brgl@bgdev.pl> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Bartosz Golaszewski We need to allocate, map and pass a buffer to the trustzone if we have more than 4 arguments for a given SCM calls. Let's use the new TrustZone allocator for that memory and shrink the code in process. As this code lives in a different compilation unit than the rest of the SCM code, we need to provide a helper in the form of qcom_scm_get_tzmem_pool() that allows the SMC low-level routines to access the SCM memory pool. Signed-off-by: Bartosz Golaszewski Reviewed-by: Andrew Halaney Tested-by: Andrew Halaney # sc8280xp-lenovo-thinkpad-= x13s --- drivers/firmware/qcom/qcom_scm-smc.c | 30 ++++++++-------------------- drivers/firmware/qcom/qcom_scm.c | 5 +++++ drivers/firmware/qcom/qcom_scm.h | 3 +++ 3 files changed, 16 insertions(+), 22 deletions(-) diff --git a/drivers/firmware/qcom/qcom_scm-smc.c b/drivers/firmware/qcom/q= com_scm-smc.c index 16cf88acfa8e..dca5f3f1883b 100644 --- a/drivers/firmware/qcom/qcom_scm-smc.c +++ b/drivers/firmware/qcom/qcom_scm-smc.c @@ -2,6 +2,7 @@ /* Copyright (c) 2015,2019 The Linux Foundation. All rights reserved. */ =20 +#include #include #include #include @@ -9,6 +10,7 @@ #include #include #include +#include #include #include =20 @@ -150,11 +152,10 @@ int __scm_smc_call(struct device *dev, const struct q= com_scm_desc *desc, enum qcom_scm_convention qcom_convention, struct qcom_scm_res *res, bool atomic) { + struct qcom_tzmem_pool *mempool =3D qcom_scm_get_tzmem_pool(); int arglen =3D desc->arginfo & 0xf; int i, ret; - dma_addr_t args_phys =3D 0; - void *args_virt =3D NULL; - size_t alloc_len; + void *args_virt __free(qcom_tzmem) =3D NULL; gfp_t flag =3D atomic ? GFP_ATOMIC : GFP_KERNEL; u32 smccc_call_type =3D atomic ? ARM_SMCCC_FAST_CALL : ARM_SMCCC_STD_CALL; u32 qcom_smccc_convention =3D (qcom_convention =3D=3D SMC_CONVENTION_ARM_= 32) ? @@ -172,9 +173,9 @@ int __scm_smc_call(struct device *dev, const struct qco= m_scm_desc *desc, smc.args[i + SCM_SMC_FIRST_REG_IDX] =3D desc->args[i]; =20 if (unlikely(arglen > SCM_SMC_N_REG_ARGS)) { - alloc_len =3D SCM_SMC_N_EXT_ARGS * sizeof(u64); - args_virt =3D kzalloc(PAGE_ALIGN(alloc_len), flag); - + args_virt =3D qcom_tzmem_alloc(mempool, + SCM_SMC_N_EXT_ARGS * sizeof(u64), + flag); if (!args_virt) return -ENOMEM; =20 @@ -192,25 +193,10 @@ int __scm_smc_call(struct device *dev, const struct q= com_scm_desc *desc, SCM_SMC_FIRST_EXT_IDX]); } =20 - args_phys =3D dma_map_single(dev, args_virt, alloc_len, - DMA_TO_DEVICE); - - if (dma_mapping_error(dev, args_phys)) { - kfree(args_virt); - return -ENOMEM; - } - - smc.args[SCM_SMC_LAST_REG_IDX] =3D args_phys; + smc.args[SCM_SMC_LAST_REG_IDX] =3D qcom_tzmem_to_phys(args_virt); } =20 - /* ret error check follows after args_virt cleanup*/ ret =3D __scm_smc_do(dev, &smc, &smc_res, atomic); - - if (args_virt) { - dma_unmap_single(dev, args_phys, alloc_len, DMA_TO_DEVICE); - kfree(args_virt); - } - if (ret) return ret; =20 diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_= scm.c index 0d4c028be0c1..71e98b666391 100644 --- a/drivers/firmware/qcom/qcom_scm.c +++ b/drivers/firmware/qcom/qcom_scm.c @@ -201,6 +201,11 @@ static void qcom_scm_bw_disable(void) enum qcom_scm_convention qcom_scm_convention =3D SMC_CONVENTION_UNKNOWN; static DEFINE_SPINLOCK(scm_query_lock); =20 +struct qcom_tzmem_pool *qcom_scm_get_tzmem_pool(void) +{ + return __scm->mempool; +} + static enum qcom_scm_convention __get_convention(void) { unsigned long flags; diff --git a/drivers/firmware/qcom/qcom_scm.h b/drivers/firmware/qcom/qcom_= scm.h index 4532907e8489..aa7d06939f8e 100644 --- a/drivers/firmware/qcom/qcom_scm.h +++ b/drivers/firmware/qcom/qcom_scm.h @@ -5,6 +5,7 @@ #define __QCOM_SCM_INT_H =20 struct device; +struct qcom_tzmem_pool; =20 enum qcom_scm_convention { SMC_CONVENTION_UNKNOWN, @@ -78,6 +79,8 @@ int scm_legacy_call_atomic(struct device *dev, const stru= ct qcom_scm_desc *desc, int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc, struct qcom_scm_res *res); =20 +struct qcom_tzmem_pool *qcom_scm_get_tzmem_pool(void); + #define QCOM_SCM_SVC_BOOT 0x01 #define QCOM_SCM_BOOT_SET_ADDR 0x01 #define QCOM_SCM_BOOT_TERMINATE_PC 0x02 --=20 2.40.1