From patchwork Fri Oct 13 11:48:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 13420767 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 106A0CDB485 for ; Fri, 13 Oct 2023 11:49:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231441AbjJMLtD (ORCPT ); Fri, 13 Oct 2023 07:49:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35940 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231473AbjJMLtB (ORCPT ); Fri, 13 Oct 2023 07:49:01 -0400 Received: from mail-wm1-x335.google.com (mail-wm1-x335.google.com [IPv6:2a00:1450:4864:20::335]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F60CDD for ; Fri, 13 Oct 2023 04:48:58 -0700 (PDT) Received: by mail-wm1-x335.google.com with SMTP id 5b1f17b1804b1-406619b53caso21226095e9.1 for ; Fri, 13 Oct 2023 04:48:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20230601.gappssmtp.com; s=20230601; t=1697197737; x=1697802537; 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=1u5aSutwel/MgT4d0b/m8JPySgFiWzm1DTcixaYm8aY=; b=cOviUgp1w2HPQqipcSB3k2osTeIao3DjvOL5mLNwEcjP8+Y/mpQqAZ94sky3LxHQw5 qPrwYZo90vrTQG3ZBH2nNyLMnkz1MiL/Vl2kDBedj4T/CiEe8J1kqtTCN106MSdds+XY FVMhdzowlS5ADKCtkGTslFM6QP5N///bpZYQTof8dRjb24WQ2Vg6OrDpj5hw2jiC1yuq A+BnQ/URJ97SwoixrqhnWrLMnVBNopgIu35RC6RtiNu8Q81JREebKoZkqRwT7HNEDchs 1bEF525EhYnsdIk9vQNBUxgXkuOcQQTBaFR1/KguZQwrHC7hK7ny2NwcDU6+G9wTfFyq ARRA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697197737; x=1697802537; 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=1u5aSutwel/MgT4d0b/m8JPySgFiWzm1DTcixaYm8aY=; b=mENZJCuB5i4tnTfn71XBGMrdvzJT98YIac1CwSSDaTOZBwgx9/obrhXD0wDlu/AJTF 29exYdt8RYk+tklQ03HBsDGIXzJXIdGy9x33gSSOugN4fyyl0QxibwAtZZaW8FcNS9Mr GkRmjJsEfGF4D6ucLnY951VwKJ1jzwVMyhtBJvQrFlrJxfJH1xa8VMGl5v1v23L3dWQn YrakfIfTzue6O9UUmutQsdzU6177DszSx0ofc7/gPm7Mth1pieau78+B+dNCL5xn6ZLy ed+X492QKC7gKf6Xo8MMJNRxQo3QZX3JqQzPeQu5GLm0hC5mEdBVmaGgxUPl16dBnBIJ W1gg== X-Gm-Message-State: AOJu0Yz9Bgsy+bCCuqp+3LRMt+iWbH+LEjmy/VZjLiY+CadyMh1XwwjO IkhwRuBkui9iI4hoY6O8OBmkJg== X-Google-Smtp-Source: AGHT+IG12/TzzYUF8ES/v+IgawK0jbc6qqDbce54ePN0r0P+LdVtayWVK1bSZ4MjBeH6r/2uvFrF0w== X-Received: by 2002:a7b:c8c8:0:b0:402:cf9f:c02d with SMTP id f8-20020a7bc8c8000000b00402cf9fc02dmr22851158wml.8.1697197736665; Fri, 13 Oct 2023 04:48:56 -0700 (PDT) Received: from brgl-uxlite.home ([2a01:cb1d:334:ac00:4209:13a:988d:80be]) by smtp.gmail.com with ESMTPSA id j23-20020a05600c1c1700b00407754b998dsm974509wms.27.2023.10.13.04.48.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Oct 2023 04:48:56 -0700 (PDT) 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: [PATCH v4 04/15] firmware: qcom: add a dedicated TrustZone buffer allocator Date: Fri, 13 Oct 2023 13:48:32 +0200 Message-Id: <20231013114843.63205-5-brgl@bgdev.pl> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231013114843.63205-1-brgl@bgdev.pl> References: <20231013114843.63205-1-brgl@bgdev.pl> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Bartosz Golaszewski We have several SCM calls that require passing buffers to the TrustZone on top of the SMC core which allocates memory for calls that require more than 4 arguments. Currently every user does their own thing which leads to code duplication. Many users call dma_alloc_coherent() for every call which is terribly unperformant (speed- and size-wise). Provide a set of library functions for creating and managing pool of memory which is suitable for sharing with the TrustZone, that is: page-aligned, contiguous and non-cachable as well as provides a way of mapping of kernel virtual addresses to physical space. Signed-off-by: Bartosz Golaszewski Reviewed-by: Andrew Halaney --- drivers/firmware/qcom/Kconfig | 19 ++ drivers/firmware/qcom/Makefile | 1 + drivers/firmware/qcom/qcom_tzmem.c | 302 +++++++++++++++++++++++ drivers/firmware/qcom/qcom_tzmem.h | 13 + include/linux/firmware/qcom/qcom_tzmem.h | 28 +++ 5 files changed, 363 insertions(+) create mode 100644 drivers/firmware/qcom/qcom_tzmem.c create mode 100644 drivers/firmware/qcom/qcom_tzmem.h create mode 100644 include/linux/firmware/qcom/qcom_tzmem.h diff --git a/drivers/firmware/qcom/Kconfig b/drivers/firmware/qcom/Kconfig index 3f05d9854ddf..b80269a28224 100644 --- a/drivers/firmware/qcom/Kconfig +++ b/drivers/firmware/qcom/Kconfig @@ -9,6 +9,25 @@ menu "Qualcomm firmware drivers" config QCOM_SCM tristate +config QCOM_TZMEM + tristate + +choice + prompt "TrustZone interface memory allocator mode" + default QCOM_TZMEM_MODE_DEFAULT + help + Selects the mode of the memory allocator providing memory buffers of + suitable format for sharing with the TrustZone. If in doubt, select + 'Default'. + +config QCOM_TZMEM_MODE_DEFAULT + bool "Default" + help + Use the default allocator mode. The memory is page-aligned, non-cachable + and contiguous. + +endchoice + config QCOM_SCM_DOWNLOAD_MODE_DEFAULT bool "Qualcomm download mode enabled by default" depends on QCOM_SCM diff --git a/drivers/firmware/qcom/Makefile b/drivers/firmware/qcom/Makefile index c9f12ee8224a..0be40a1abc13 100644 --- a/drivers/firmware/qcom/Makefile +++ b/drivers/firmware/qcom/Makefile @@ -5,5 +5,6 @@ obj-$(CONFIG_QCOM_SCM) += qcom-scm.o qcom-scm-objs += qcom_scm.o qcom_scm-smc.o qcom_scm-legacy.o +obj-$(CONFIG_QCOM_TZMEM) += qcom_tzmem.o obj-$(CONFIG_QCOM_QSEECOM) += qcom_qseecom.o obj-$(CONFIG_QCOM_QSEECOM_UEFISECAPP) += qcom_qseecom_uefisecapp.o diff --git a/drivers/firmware/qcom/qcom_tzmem.c b/drivers/firmware/qcom/qcom_tzmem.c new file mode 100644 index 000000000000..68ca59c5598e --- /dev/null +++ b/drivers/firmware/qcom/qcom_tzmem.c @@ -0,0 +1,302 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Memory allocator for buffers shared with the TrustZone. + * + * Copyright (C) 2023 Linaro Ltd. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "qcom_tzmem.h" + +struct qcom_tzmem_pool { + void *vbase; + phys_addr_t pbase; + size_t size; + struct gen_pool *pool; + void *priv; +}; + +struct qcom_tzmem_chunk { + phys_addr_t paddr; + size_t size; + struct qcom_tzmem_pool *owner; +}; + +static struct device *qcom_tzmem_dev; +static RADIX_TREE(qcom_tzmem_chunks, GFP_ATOMIC); +static DEFINE_SPINLOCK(qcom_tzmem_chunks_lock); + +#if IS_ENABLED(CONFIG_QCOM_TZMEM_MODE_DEFAULT) + +static int qcom_tzmem_init(void) +{ + return 0; +} + +static int qcom_tzmem_init_pool(struct qcom_tzmem_pool *pool) +{ + return 0; +} + +static void qcom_tzmem_cleanup_pool(struct qcom_tzmem_pool *pool) +{ + +} + +#endif /* CONFIG_QCOM_TZMEM_MODE_DEFAULT */ + +/** + * qcom_tzmem_pool_new() - Create a new TZ memory pool. + * @size: Size of the new pool in bytes. + * + * Create a new pool of memory suitable for sharing with the TrustZone. + * + * Must not be used in atomic context. + * + * Returns: + * New memory pool address or ERR_PTR() on error. + */ +struct qcom_tzmem_pool *qcom_tzmem_pool_new(size_t size) +{ + struct qcom_tzmem_pool *pool; + int ret = -ENOMEM; + + if (!size) + return ERR_PTR(-EINVAL); + + size = PAGE_ALIGN(size); + + pool = kzalloc(sizeof(*pool), GFP_KERNEL); + if (!pool) + return ERR_PTR(-ENOMEM); + + pool->size = size; + + pool->vbase = dma_alloc_coherent(qcom_tzmem_dev, size, &pool->pbase, + GFP_KERNEL); + if (!pool->vbase) + goto err_kfree_pool; + + pool->pool = gen_pool_create(PAGE_SHIFT, -1); + if (!pool) + goto err_dma_free; + + gen_pool_set_algo(pool->pool, gen_pool_best_fit, NULL); + + ret = gen_pool_add_virt(pool->pool, (unsigned long)pool->vbase, + pool->pbase, size, -1); + if (ret) + goto err_destroy_genpool; + + ret = qcom_tzmem_init_pool(pool); + if (ret) + goto err_destroy_genpool; + + return pool; + +err_destroy_genpool: + gen_pool_destroy(pool->pool); +err_dma_free: + dma_free_coherent(qcom_tzmem_dev, size, pool->vbase, pool->pbase); +err_kfree_pool: + kfree(pool); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(qcom_tzmem_pool_new); + +/** + * qcom_tzmem_pool_free() - Destroy a TZ memory pool and free all resources. + * @pool: Memory pool to free. + * + * Must not be called if any of the allocated chunks has not been freed. + * Must not be used in atomic context. + */ +void qcom_tzmem_pool_free(struct qcom_tzmem_pool *pool) +{ + struct qcom_tzmem_chunk *chunk; + struct radix_tree_iter iter; + bool non_empty = false; + void __rcu **slot; + + if (!pool) + return; + + qcom_tzmem_cleanup_pool(pool); + + scoped_guard(spinlock_irqsave, &qcom_tzmem_chunks_lock) { + radix_tree_for_each_slot(slot, &qcom_tzmem_chunks, &iter, 0) { + chunk = radix_tree_deref_slot_protected(slot, + &qcom_tzmem_chunks_lock); + + if (chunk->owner == pool) + non_empty = true; + } + } + + WARN(non_empty, "Freeing TZ memory pool with memory still allocated"); + + gen_pool_destroy(pool->pool); + dma_free_coherent(qcom_tzmem_dev, pool->size, pool->vbase, pool->pbase); + kfree(pool); +} +EXPORT_SYMBOL_GPL(qcom_tzmem_pool_free); + +static void devm_qcom_tzmem_pool_free(void *data) +{ + struct qcom_tzmem_pool *pool = data; + + qcom_tzmem_pool_free(pool); +} + +/** + * devm_qcom_tzmem_pool_new() - Managed variant of qcom_tzmem_pool_new(). + * @dev: Device managing this resource. + * @size: Size of the pool in bytes. + * + * Must not be used in atomic context. + * + * Returns: + * Address of the managed pool or ERR_PTR() on failure. + */ +struct qcom_tzmem_pool * +devm_qcom_tzmem_pool_new(struct device *dev, size_t size) +{ + struct qcom_tzmem_pool *pool; + int ret; + + pool = qcom_tzmem_pool_new(size); + if (IS_ERR(pool)) + return pool; + + ret = devm_add_action_or_reset(dev, devm_qcom_tzmem_pool_free, pool); + if (ret) + return ERR_PTR(ret); + + return pool; +} + +/** + * qcom_tzmem_alloc() - Allocate a memory chunk suitable for sharing with TZ. + * @pool: TZ memory pool from which to allocate memory. + * @size: Number of bytes to allocate. + * @gfp: GFP flags. + * + * Can be used in any context. + * + * Returns: + * Address of the allocated buffer or NULL if no more memory can be allocated. + * The buffer must be released using qcom_tzmem_free(). + */ +void *qcom_tzmem_alloc(struct qcom_tzmem_pool *pool, size_t size, gfp_t gfp) +{ + struct qcom_tzmem_chunk *chunk; + unsigned long vaddr; + int ret; + + if (!size) + return NULL; + + size = PAGE_ALIGN(size); + + chunk = kzalloc(sizeof(*chunk), gfp); + if (!chunk) + return NULL; + + vaddr = gen_pool_alloc(pool->pool, size); + if (!vaddr) { + kfree(chunk); + return NULL; + } + + chunk->paddr = gen_pool_virt_to_phys(pool->pool, vaddr); + chunk->size = size; + chunk->owner = pool; + + scoped_guard(spinlock_irqsave, &qcom_tzmem_chunks_lock) { + ret = radix_tree_insert(&qcom_tzmem_chunks, vaddr, chunk); + if (ret) { + gen_pool_free(pool->pool, vaddr, size); + kfree(chunk); + return NULL; + } + } + + return (void *)vaddr; +} +EXPORT_SYMBOL_GPL(qcom_tzmem_alloc); + +/** + * qcom_tzmem_free() - Release a buffer allocated from a TZ memory pool. + * @vaddr: Virtual address of the buffer. + * + * Can be used in any context. + */ +void qcom_tzmem_free(void *vaddr) +{ + struct qcom_tzmem_chunk *chunk; + + scoped_guard(spinlock_irqsave, &qcom_tzmem_chunks_lock) + chunk = radix_tree_delete_item(&qcom_tzmem_chunks, + (unsigned long)vaddr, NULL); + + if (!chunk) { + WARN(1, "Virtual address %p not owned by TZ memory allocator", + vaddr); + return; + } + + gen_pool_free(chunk->owner->pool, (unsigned long)vaddr, chunk->size); + kfree(chunk); +} +EXPORT_SYMBOL_GPL(qcom_tzmem_free); + +/** + * qcom_tzmem_to_phys() - Map the virtual address of a TZ buffer to physical. + * @vaddr: Virtual address of the buffer allocated from a TZ memory pool. + * + * Can be used in any context. The address must have been returned by a call + * to qcom_tzmem_alloc(). + * + * Returns: + * Physical address of the buffer. + */ +phys_addr_t qcom_tzmem_to_phys(void *vaddr) +{ + struct qcom_tzmem_chunk *chunk; + + guard(spinlock_irqsave)(&qcom_tzmem_chunks_lock); + + chunk = radix_tree_lookup(&qcom_tzmem_chunks, (unsigned long)vaddr); + if (!chunk) + return 0; + + return chunk->paddr; +} +EXPORT_SYMBOL_GPL(qcom_tzmem_to_phys); + +int qcom_tzmem_enable(struct device *dev) +{ + if (qcom_tzmem_dev) + return -EBUSY; + + qcom_tzmem_dev = dev; + + return qcom_tzmem_init(); +} +EXPORT_SYMBOL_GPL(qcom_tzmem_enable); + +MODULE_DESCRIPTION("TrustZone memory allocator for Qualcomm firmware drivers"); +MODULE_AUTHOR("Bartosz Golaszewski "); +MODULE_LICENSE("GPL"); diff --git a/drivers/firmware/qcom/qcom_tzmem.h b/drivers/firmware/qcom/qcom_tzmem.h new file mode 100644 index 000000000000..f82f5dc5b7b1 --- /dev/null +++ b/drivers/firmware/qcom/qcom_tzmem.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2023 Linaro Ltd. + */ + +#ifndef __QCOM_TZMEM_PRIV_H +#define __QCOM_TZMEM_PRIV_H + +struct device; + +int qcom_tzmem_enable(struct device *dev); + +#endif /* __QCOM_TZMEM_PRIV_H */ diff --git a/include/linux/firmware/qcom/qcom_tzmem.h b/include/linux/firmware/qcom/qcom_tzmem.h new file mode 100644 index 000000000000..8e7fddab8cb4 --- /dev/null +++ b/include/linux/firmware/qcom/qcom_tzmem.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2023 Linaro Ltd. + */ + +#ifndef __QCOM_TZMEM_H +#define __QCOM_TZMEM_H + +#include +#include +#include + +struct device; +struct qcom_tzmem_pool; + +struct qcom_tzmem_pool *qcom_tzmem_pool_new(size_t size); +void qcom_tzmem_pool_free(struct qcom_tzmem_pool *pool); +struct qcom_tzmem_pool * +devm_qcom_tzmem_pool_new(struct device *dev, size_t size); + +void *qcom_tzmem_alloc(struct qcom_tzmem_pool *pool, size_t size, gfp_t gfp); +void qcom_tzmem_free(void *ptr); + +DEFINE_FREE(qcom_tzmem, void *, if (_T) qcom_tzmem_free(_T)); + +phys_addr_t qcom_tzmem_to_phys(void *ptr); + +#endif /* __QCOM_TZMEM */