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[98.128.140.123]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5e5bcd1595bsm65714a12.42.2025.03.05.05.06.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Mar 2025 05:06:57 -0800 (PST) From: Jens Wiklander To: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, op-tee@lists.trustedfirmware.org, linux-arm-kernel@lists.infradead.org Cc: Olivier Masse , Thierry Reding , Yong Wu , Sumit Semwal , Benjamin Gaignard , Brian Starkey , John Stultz , "T . J . Mercier" , =?UTF-8?q?Christian=20K=C3=B6nig?= , Sumit Garg , Matthias Brugger , AngeloGioacchino Del Regno , azarrabi@qti.qualcomm.com, Simona Vetter , Daniel Stone , Jens Wiklander Subject: [PATCH v6 07/10] tee: add tee_shm_alloc_cma_phys_mem() Date: Wed, 5 Mar 2025 14:04:13 +0100 Message-ID: <20250305130634.1850178-8-jens.wiklander@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250305130634.1850178-1-jens.wiklander@linaro.org> References: <20250305130634.1850178-1-jens.wiklander@linaro.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add tee_shm_alloc_cma_phys_mem() to allocate a physical memory using from the default CMA pool. The memory is represented by a tee_shm object using the new flag TEE_SHM_CMA_BUF to identify it as physical memory from CMA. Signed-off-by: Jens Wiklander --- drivers/tee/tee_shm.c | 55 ++++++++++++++++++++++++++++++++++++++-- include/linux/tee_core.h | 4 +++ 2 files changed, 57 insertions(+), 2 deletions(-) diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c index 8b79918468b5..8d8341f8ebd7 100644 --- a/drivers/tee/tee_shm.c +++ b/drivers/tee/tee_shm.c @@ -3,8 +3,11 @@ * Copyright (c) 2015-2017, 2019-2021 Linaro Limited */ #include +#include #include #include +#include +#include #include #include #include @@ -13,7 +16,6 @@ #include #include #include -#include #include "tee_private.h" =20 /* extra references appended to shm object for registered shared memory */ @@ -59,7 +61,14 @@ static void tee_shm_release(struct tee_device *teedev, s= truct tee_shm *shm) struct tee_shm *parent_shm =3D NULL; void *p =3D shm; =20 - if (shm->flags & TEE_SHM_DMA_BUF) { + if (shm->flags & TEE_SHM_CMA_BUF) { +#if !IS_MODULE(CONFIG_TEE) && IS_ENABLED(CONFIG_CMA) + struct page *page =3D phys_to_page(shm->paddr); + struct cma *cma =3D dev_get_cma_area(&shm->ctx->teedev->dev); + + cma_release(cma, page, shm->size / PAGE_SIZE); +#endif + } else if (shm->flags & TEE_SHM_DMA_BUF) { struct tee_shm_dmabuf_ref *ref; =20 ref =3D container_of(shm, struct tee_shm_dmabuf_ref, shm); @@ -341,6 +350,48 @@ struct tee_shm *tee_shm_alloc_priv_buf(struct tee_cont= ext *ctx, size_t size) } EXPORT_SYMBOL_GPL(tee_shm_alloc_priv_buf); =20 +struct tee_shm *tee_shm_alloc_cma_phys_mem(struct tee_context *ctx, + size_t page_count, size_t align) +{ +#if !IS_MODULE(CONFIG_TEE) && IS_ENABLED(CONFIG_CMA) + struct tee_device *teedev =3D ctx->teedev; + struct cma *cma =3D dev_get_cma_area(&teedev->dev); + struct tee_shm *shm; + struct page *page; + + if (!tee_device_get(teedev)) + return ERR_PTR(-EINVAL); + + page =3D cma_alloc(cma, page_count, align, true/*no_warn*/); + if (!page) + goto err_put_teedev; + + shm =3D kzalloc(sizeof(*shm), GFP_KERNEL); + if (!shm) + goto err_cma_crelease; + + refcount_set(&shm->refcount, 1); + shm->ctx =3D ctx; + shm->paddr =3D page_to_phys(page); + shm->size =3D page_count * PAGE_SIZE; + shm->flags =3D TEE_SHM_CMA_BUF; + + teedev_ctx_get(ctx); + + return shm; + +err_cma_crelease: + cma_release(cma, page, page_count); +err_put_teedev: + tee_device_put(teedev); + + return ERR_PTR(-ENOMEM); +#else + return ERR_PTR(-EINVAL); +#endif +} +EXPORT_SYMBOL_GPL(tee_shm_alloc_cma_phys_mem); + int tee_dyn_shm_alloc_helper(struct tee_shm *shm, size_t size, size_t alig= n, int (*shm_register)(struct tee_context *ctx, struct tee_shm *shm, diff --git a/include/linux/tee_core.h b/include/linux/tee_core.h index 6bd833b6d0e1..b6727d9a3556 100644 --- a/include/linux/tee_core.h +++ b/include/linux/tee_core.h @@ -29,6 +29,7 @@ #define TEE_SHM_POOL BIT(2) /* Memory allocated from pool */ #define TEE_SHM_PRIV BIT(3) /* Memory private to TEE driver */ #define TEE_SHM_DMA_BUF BIT(4) /* Memory with dma-buf handle */ +#define TEE_SHM_CMA_BUF BIT(5) /* CMA allocated memory */ =20 #define TEE_DEVICE_FLAG_REGISTERED 0x1 #define TEE_MAX_DEV_NAME_LEN 32 @@ -307,6 +308,9 @@ void *tee_get_drvdata(struct tee_device *teedev); */ struct tee_shm *tee_shm_alloc_priv_buf(struct tee_context *ctx, size_t siz= e); =20 +struct tee_shm *tee_shm_alloc_cma_phys_mem(struct tee_context *ctx, + size_t page_count, size_t align); + int tee_dyn_shm_alloc_helper(struct tee_shm *shm, size_t size, size_t alig= n, int (*shm_register)(struct tee_context *ctx, struct tee_shm *shm, --=20 2.43.0