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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-742a970954asm18037286b3a.46.2025.05.26.23.57.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 May 2025 23:57:27 -0700 (PDT) From: Amirreza Zarrabi Date: Mon, 26 May 2025 23:56:53 -0700 Subject: [PATCH v5 08/12] firmware: qcom: tzmem: export shm_bridge create/delete Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250526-qcom-tee-using-tee-ss-without-mem-obj-v5-8-024e3221b0b9@oss.qualcomm.com> References: <20250526-qcom-tee-using-tee-ss-without-mem-obj-v5-0-024e3221b0b9@oss.qualcomm.com> In-Reply-To: <20250526-qcom-tee-using-tee-ss-without-mem-obj-v5-0-024e3221b0b9@oss.qualcomm.com> To: Jens Wiklander , Sumit Garg , Bjorn Andersson , Konrad Dybcio , Bartosz Golaszewski , Apurupa Pattapu , Kees Cook , "Gustavo A. R. Silva" , Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= Cc: Harshal Dev , linux-arm-msm@vger.kernel.org, op-tee@lists.trustedfirmware.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-doc@vger.kernel.org, Amirreza Zarrabi , Neil Armstrong X-Mailer: b4 0.13.0 X-Proofpoint-GUID: X2EV2N-QH6hytuL6oTQsBaCSVEjyLZMv X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNTI3MDA1NCBTYWx0ZWRfX2gaSwBT7LUNS oGfRBTOcq60VC5txJ8qYpE1qj36lNBhP5kcOn+Tsq8twxcl8oY60OO8RlstE7pKuM7rjoeHeP2V ZHbKmcbxY1w7bItd0bM3zSgCHvis+tlzVoAF+bs0GZhCBb3wCtL3W5dGos+lUboCPHyYNccAFab sTByRUzGuU6eA4JlV8t3qPv8NIiv1/rVUY/FAQa9drMPUfpThSPIKr5Y9v/bCFYElxAWO7QXqnT H526bA8NAGZWMusDV7JhEdVtV5IpwPN28mWpJndlfaNvZ0/9FbJxIaOcNN2BwagoW+aajuAxaG2 FOzJpvFCH+0h8iuaJ2qRJi8958lV/ICpc9VpHNlPmydMQ3S0dIpgkKDcFrG1bISwXoipN118rMR 7viPAENtWUfXjja8B7q7IJC+TYI+pbp6GVID01co/g57uHMJ8JlDASsbSMa8m1UX8VG1XAg8 X-Proofpoint-ORIG-GUID: X2EV2N-QH6hytuL6oTQsBaCSVEjyLZMv X-Authority-Analysis: v=2.4 cv=Mq5S63ae c=1 sm=1 tr=0 ts=68356259 cx=c_pps a=Qgeoaf8Lrialg5Z894R3/Q==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=IkcTkHD0fZMA:10 a=dt9VzEwgFbYA:10 a=KKAkSRfTAAAA:8 a=EUspDBNiAAAA:8 a=F9FMNDSCD7THEPBdllMA:9 a=QEXdDO2ut3YA:10 a=x9snwWr2DeNwDh03kgHS:22 a=cvBusfyB2V15izCimMoJ:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-05-27_03,2025-05-26_02,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 phishscore=0 suspectscore=0 mlxscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 adultscore=0 mlxlogscore=999 bulkscore=0 impostorscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505160000 definitions=main-2505270054 Anyone with access to contiguous physical memory should be able to share memory with QTEE using shm_bridge. Tested-by: Neil Armstrong Signed-off-by: Amirreza Zarrabi --- drivers/firmware/qcom/qcom_tzmem.c | 57 +++++++++++++++++++++++++------- include/linux/firmware/qcom/qcom_tzmem.h | 15 +++++++++ 2 files changed, 60 insertions(+), 12 deletions(-) diff --git a/drivers/firmware/qcom/qcom_tzmem.c b/drivers/firmware/qcom/qcom_tzmem.c index 4fe333fd2f07..e9e4f06924ae 100644 --- a/drivers/firmware/qcom/qcom_tzmem.c +++ b/drivers/firmware/qcom/qcom_tzmem.c @@ -108,25 +108,61 @@ static int qcom_tzmem_init(void) return 0; } -static int qcom_tzmem_init_area(struct qcom_tzmem_area *area) +/** + * qcom_tzmem_shm_bridge_create() - Create a SHM bridge. + * @paddr: Physical address of the memory to share. + * @size: Size of the memory to share. + * @handle: Handle to the SHM bridge. + * + * On platforms that support SHM bridge, this function creates a SHM bridge + * for the given memory region with QTEE. The handle returned by this function + * must be passed to qcom_tzmem_shm_bridge_delete() to free the SHM bridge. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +int qcom_tzmem_shm_bridge_create(phys_addr_t paddr, size_t size, u64 *handle) { u64 pfn_and_ns_perm, ipfn_and_s_perm, size_and_flags; - int ret; if (!qcom_tzmem_using_shm_bridge) return 0; - pfn_and_ns_perm = (u64)area->paddr | QCOM_SCM_PERM_RW; - ipfn_and_s_perm = (u64)area->paddr | QCOM_SCM_PERM_RW; - size_and_flags = area->size | (1 << QCOM_SHM_BRIDGE_NUM_VM_SHIFT); + pfn_and_ns_perm = paddr | QCOM_SCM_PERM_RW; + ipfn_and_s_perm = paddr | QCOM_SCM_PERM_RW; + size_and_flags = size | (1 << QCOM_SHM_BRIDGE_NUM_VM_SHIFT); + if (qcom_scm_shm_bridge_create(pfn_and_ns_perm, ipfn_and_s_perm, + size_and_flags, QCOM_SCM_VMID_HLOS, + handle)) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL_GPL(qcom_tzmem_shm_bridge_create); + +/** + * qcom_tzmem_shm_bridge_delete() - Delete a SHM bridge. + * @handle: Handle to the SHM bridge. + * + * On platforms that support SHM bridge, this function deletes the SHM bridge + * for the given memory region. The handle must be the same as the one + * returned by qcom_tzmem_shm_bridge_create(). + */ +void qcom_tzmem_shm_bridge_delete(u64 handle) +{ + if (qcom_tzmem_using_shm_bridge) + qcom_scm_shm_bridge_delete(handle); +} +EXPORT_SYMBOL_GPL(qcom_tzmem_shm_bridge_delete); + +static int qcom_tzmem_init_area(struct qcom_tzmem_area *area) +{ + int ret; u64 *handle __free(kfree) = kzalloc(sizeof(*handle), GFP_KERNEL); if (!handle) return -ENOMEM; - ret = qcom_scm_shm_bridge_create(pfn_and_ns_perm, ipfn_and_s_perm, - size_and_flags, QCOM_SCM_VMID_HLOS, - handle); + ret = qcom_tzmem_shm_bridge_create(area->paddr, area->size, handle); if (ret) return ret; @@ -139,10 +175,7 @@ static void qcom_tzmem_cleanup_area(struct qcom_tzmem_area *area) { u64 *handle = area->priv; - if (!qcom_tzmem_using_shm_bridge) - return; - - qcom_scm_shm_bridge_delete(*handle); + qcom_tzmem_shm_bridge_delete(*handle); kfree(handle); } diff --git a/include/linux/firmware/qcom/qcom_tzmem.h b/include/linux/firmware/qcom/qcom_tzmem.h index b83b63a0c049..48ac0e5454c7 100644 --- a/include/linux/firmware/qcom/qcom_tzmem.h +++ b/include/linux/firmware/qcom/qcom_tzmem.h @@ -53,4 +53,19 @@ DEFINE_FREE(qcom_tzmem, void *, if (_T) qcom_tzmem_free(_T)) phys_addr_t qcom_tzmem_to_phys(void *ptr); +#if IS_ENABLED(CONFIG_QCOM_TZMEM_MODE_SHMBRIDGE) +int qcom_tzmem_shm_bridge_create(phys_addr_t paddr, size_t size, u64 *handle); +void qcom_tzmem_shm_bridge_delete(u64 handle); +#else +static inline int qcom_tzmem_shm_bridge_create(phys_addr_t paddr, + size_t size, u64 *handle) +{ + return 0; +} + +static inline void qcom_tzmem_shm_bridge_delete(u64 handle) +{ +} +#endif + #endif /* __QCOM_TZMEM */ -- 2.34.1