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[98.128.140.123]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-aba53376abbsm861900766b.93.2025.02.17.01.35.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Feb 2025 01:35:48 -0800 (PST) Date: Mon, 17 Feb 2025 10:35:46 +0100 From: Jens Wiklander To: Amirreza Zarrabi Cc: Sumit Garg , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bartosz Golaszewski , Srinivas Kandagatla , linux-arm-msm@vger.kernel.org, op-tee@lists.trustedfirmware.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-doc@vger.kernel.org Subject: Re: [PATCH v2 2/8] tee: add close_context to TEE driver operation Message-ID: <20250217093546.GA2637163@rayden> References: <20250202-qcom-tee-using-tee-ss-without-mem-obj-v2-0-297eacd0d34f@quicinc.com> <20250202-qcom-tee-using-tee-ss-without-mem-obj-v2-2-297eacd0d34f@quicinc.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20250202-qcom-tee-using-tee-ss-without-mem-obj-v2-2-297eacd0d34f@quicinc.com> Hi, On Sun, Feb 02, 2025 at 06:43:30PM -0800, Amirreza Zarrabi wrote: > The tee_context can be used to manage TEE user resources, including > those allocated by the driver for the TEE on behalf of the user. > The release() callback is invoked only when all resources, such as > tee_shm, are released and there are no references to the tee_context. > > When a user closes the device file, the driver should notify the > TEE to release any resources it may hold and drop the context > references. To achieve this, a close_context() callback is > introduced to initiate resource release in the TEE driver when > the device file is closed. > > Relocate teedev_ctx_get, teedev_ctx_put, tee_device_get, and > tee_device_get functions to tee_drv.h to make them accessible > outside the TEE subsystem. > > Signed-off-by: Amirreza Zarrabi > --- > drivers/tee/tee_core.c | 7 +++++++ > drivers/tee/tee_private.h | 6 ------ > include/linux/tee_core.h | 11 +++++++++-- > include/linux/tee_drv.h | 6 ++++++ > 4 files changed, 22 insertions(+), 8 deletions(-) > > diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c > index 24edce4cdbaa..721522fe5c63 100644 > --- a/drivers/tee/tee_core.c > +++ b/drivers/tee/tee_core.c > @@ -79,6 +79,7 @@ void teedev_ctx_get(struct tee_context *ctx) > > kref_get(&ctx->refcount); > } > +EXPORT_SYMBOL_GPL(teedev_ctx_get); > > static void teedev_ctx_release(struct kref *ref) > { > @@ -96,11 +97,15 @@ void teedev_ctx_put(struct tee_context *ctx) > > kref_put(&ctx->refcount, teedev_ctx_release); > } > +EXPORT_SYMBOL_GPL(teedev_ctx_put); > > void teedev_close_context(struct tee_context *ctx) > { > struct tee_device *teedev = ctx->teedev; > > + if (teedev->desc->ops->close_context) > + teedev->desc->ops->close_context(ctx); > + > teedev_ctx_put(ctx); > tee_device_put(teedev); > } > @@ -1037,6 +1042,7 @@ void tee_device_put(struct tee_device *teedev) > } > mutex_unlock(&teedev->mutex); > } > +EXPORT_SYMBOL_GPL(tee_device_put); > > bool tee_device_get(struct tee_device *teedev) > { > @@ -1049,6 +1055,7 @@ bool tee_device_get(struct tee_device *teedev) > mutex_unlock(&teedev->mutex); > return true; > } > +EXPORT_SYMBOL_GPL(tee_device_get); > > /** > * tee_device_unregister() - Removes a TEE device > diff --git a/drivers/tee/tee_private.h b/drivers/tee/tee_private.h > index 9bc50605227c..d3f40a03de36 100644 > --- a/drivers/tee/tee_private.h > +++ b/drivers/tee/tee_private.h > @@ -14,12 +14,6 @@ > > int tee_shm_get_fd(struct tee_shm *shm); > > -bool tee_device_get(struct tee_device *teedev); > -void tee_device_put(struct tee_device *teedev); > - > -void teedev_ctx_get(struct tee_context *ctx); > -void teedev_ctx_put(struct tee_context *ctx); > - > struct tee_shm *tee_shm_alloc_user_buf(struct tee_context *ctx, size_t size); > struct tee_shm *tee_shm_register_user_buf(struct tee_context *ctx, > unsigned long addr, size_t length); > diff --git a/include/linux/tee_core.h b/include/linux/tee_core.h > index a38494d6b5f4..8a4c9e30b652 100644 > --- a/include/linux/tee_core.h > +++ b/include/linux/tee_core.h > @@ -65,8 +65,9 @@ struct tee_device { > /** > * struct tee_driver_ops - driver operations vtable > * @get_version: returns version of driver > - * @open: called when the device file is opened > - * @release: release this open file > + * @open: called for a context when the device file is opened > + * @close_context: called when the device file is closed > + * @release: called to release the context > * @open_session: open a new session > * @close_session: close a session > * @system_session: declare session as a system session > @@ -76,11 +77,17 @@ struct tee_device { > * @supp_send: called for supplicant to send a response > * @shm_register: register shared memory buffer in TEE > * @shm_unregister: unregister shared memory buffer in TEE > + * > + * The context given to @open might last longer than the device file if it is > + * tied to other resources in the TEE driver. @close_context is called when the > + * client closes the device file, even if there are existing references to the > + * context. The TEE driver can use @close_context to start cleaning up. > */ > struct tee_driver_ops { > void (*get_version)(struct tee_device *teedev, > struct tee_ioctl_version_data *vers); > int (*open)(struct tee_context *ctx); > + void (*close_context)(struct tee_context *ctx); > void (*release)(struct tee_context *ctx); > int (*open_session)(struct tee_context *ctx, > struct tee_ioctl_open_session_arg *arg, > diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h > index a54c203000ed..d5f0c70ac95c 100644 > --- a/include/linux/tee_drv.h > +++ b/include/linux/tee_drv.h > @@ -96,6 +96,12 @@ struct tee_param { > } u; > }; > > +bool tee_device_get(struct tee_device *teedev); > +void tee_device_put(struct tee_device *teedev); > + > +void teedev_ctx_get(struct tee_context *ctx); > +void teedev_ctx_put(struct tee_context *ctx); > + Now that these functions are available to all the backend drivers, please add some documentation for them so it more clear how they are supposed to be used. Thanks, Jens > /** > * tee_shm_alloc_kernel_buf() - Allocate kernel shared memory for a > * particular TEE client driver > > -- > 2.34.1 >