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Sat, 11 Nov 2023 04:16:33 -0700 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by mtkmbs10n2.mediatek.inc (172.21.101.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Sat, 11 Nov 2023 19:16:29 +0800 Received: from mhfsdcap04.gcn.mediatek.inc (10.17.3.154) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Sat, 11 Nov 2023 19:16:28 +0800 From: Yong Wu To: Rob Herring , Sumit Semwal , , Matthias Brugger CC: Krzysztof Kozlowski , Conor Dooley , Benjamin Gaignard , Brian Starkey , John Stultz , , AngeloGioacchino Del Regno , Yong Wu , , , , , , , , , , Vijayanand Jitta , Joakim Bech , Jeffrey Kardatzke , Nicolas Dufresne , Subject: [PATCH v2 1/8] dma-buf: heaps: Initialize a secure heap Date: Sat, 11 Nov 2023 19:15:52 +0800 Message-ID: <20231111111559.8218-2-yong.wu@mediatek.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231111111559.8218-1-yong.wu@mediatek.com> References: <20231111111559.8218-1-yong.wu@mediatek.com> MIME-Version: 1.0 X-TM-AS-Product-Ver: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-AS-Result: No-10--0.102500-8.000000 X-TMASE-MatchedRID: R/IVBg3SNBztAxjyNphE0lz+axQLnAVB5Y0kb0hqatw1LB46LFAAkpkC erFMaabiXQS0szagh4NSeVWfRpnv1OG0fWP55EEGma6DzXaohvPJ5SXtoJPLyCfO9H6Y/dy+Ogm GgL3Bwl0o7OCuyuJ1PmqR4nX2iz2+28kC8Kr7Asnil2r2x2PwtYfsPVs/8Vw6wDR44lliPu14ou ZEjkeLRr1/tzoqsVtZ7u6XJjV0Px9vrBnHW6XSnLrbxxduc6FPfrTt+hmA5bLczkKO5k4APoHP3 u3XDM5D4vM1YF6AJbbCCfuIMF6xLd934/rDAK3zlGdyD+QE2h9stf3gH1DFfDLh2YhC+ssg+n7K vjpDA2q2eoE4McoveEfJyHP7nZLkRo7PQ4TnmqaIqXjHhHSOrf0wV9qYAdsBye5hsD33dxxtUY6 LqdlQnFr3vnlc+D6eVZObrZkNVZRlRd/nfa56MaSPBBRGVW4o X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--0.102500-8.000000 X-TMASE-Version: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-SNTS-SMTP: B1A63D69B5B3FF16385E0990BF5DBBB8142FEFB549F5713A3389450CC12E462B2000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231111_031639_717106_447CAA49 X-CRM114-Status: GOOD ( 18.87 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Initialize a secure heap. Currently just add a null heap, Prepare for the later patches. Signed-off-by: Yong Wu --- drivers/dma-buf/heaps/Kconfig | 7 +++ drivers/dma-buf/heaps/Makefile | 1 + drivers/dma-buf/heaps/secure_heap.c | 98 +++++++++++++++++++++++++++++ 3 files changed, 106 insertions(+) create mode 100644 drivers/dma-buf/heaps/secure_heap.c diff --git a/drivers/dma-buf/heaps/Kconfig b/drivers/dma-buf/heaps/Kconfig index a5eef06c4226..e358bf711145 100644 --- a/drivers/dma-buf/heaps/Kconfig +++ b/drivers/dma-buf/heaps/Kconfig @@ -12,3 +12,10 @@ config DMABUF_HEAPS_CMA Choose this option to enable dma-buf CMA heap. This heap is backed by the Contiguous Memory Allocator (CMA). If your system has these regions, you should say Y here. + +config DMABUF_HEAPS_SECURE + bool "DMA-BUF Secure Heap" + depends on DMABUF_HEAPS && TEE + help + Choose this option to enable dma-buf secure heap. This heap is backed by + TEE client interfaces or CMA. If in doubt, say N. diff --git a/drivers/dma-buf/heaps/Makefile b/drivers/dma-buf/heaps/Makefile index 974467791032..b1ad9d1f2fbe 100644 --- a/drivers/dma-buf/heaps/Makefile +++ b/drivers/dma-buf/heaps/Makefile @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_DMABUF_HEAPS_SECURE) += secure_heap.o obj-$(CONFIG_DMABUF_HEAPS_SYSTEM) += system_heap.o obj-$(CONFIG_DMABUF_HEAPS_CMA) += cma_heap.o diff --git a/drivers/dma-buf/heaps/secure_heap.c b/drivers/dma-buf/heaps/secure_heap.c new file mode 100644 index 000000000000..a634051a0a67 --- /dev/null +++ b/drivers/dma-buf/heaps/secure_heap.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * DMABUF secure heap exporter + * + * Copyright (C) 2023 MediaTek Inc. + */ + +#include +#include +#include +#include +#include + +enum secure_memory_type { + /* + * MediaTek static chunk memory carved out for TrustZone. The memory + * management is inside the TEE. + */ + SECURE_MEMORY_TYPE_MTK_CM_TZ = 1, +}; + +struct secure_buffer { + struct dma_heap *heap; + size_t size; +}; + +struct secure_heap { + const char *name; + const enum secure_memory_type mem_type; +}; + +static struct dma_buf * +secure_heap_allocate(struct dma_heap *heap, unsigned long size, + unsigned long fd_flags, unsigned long heap_flags) +{ + struct secure_buffer *sec_buf; + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + struct dma_buf *dmabuf; + int ret; + + sec_buf = kzalloc(sizeof(*sec_buf), GFP_KERNEL); + if (!sec_buf) + return ERR_PTR(-ENOMEM); + + sec_buf->size = ALIGN(size, PAGE_SIZE); + sec_buf->heap = heap; + + exp_info.exp_name = dma_heap_get_name(heap); + exp_info.size = sec_buf->size; + exp_info.flags = fd_flags; + exp_info.priv = sec_buf; + + dmabuf = dma_buf_export(&exp_info); + if (IS_ERR(dmabuf)) { + ret = PTR_ERR(dmabuf); + goto err_free_buf; + } + + return dmabuf; + +err_free_buf: + kfree(sec_buf); + return ERR_PTR(ret); +} + +static const struct dma_heap_ops sec_heap_ops = { + .allocate = secure_heap_allocate, +}; + +static struct secure_heap secure_heaps[] = { + { + .name = "secure_mtk_cm", + .mem_type = SECURE_MEMORY_TYPE_MTK_CM_TZ, + }, +}; + +static int secure_heap_init(void) +{ + struct secure_heap *sec_heap = secure_heaps; + struct dma_heap_export_info exp_info; + struct dma_heap *heap; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(secure_heaps); i++, sec_heap++) { + exp_info.name = sec_heap->name; + exp_info.ops = &sec_heap_ops; + exp_info.priv = (void *)sec_heap; + + heap = dma_heap_add(&exp_info); + if (IS_ERR(heap)) + return PTR_ERR(heap); + } + return 0; +} + +module_init(secure_heap_init); +MODULE_DESCRIPTION("Secure Heap Driver"); +MODULE_LICENSE("GPL");