| Message ID | 1547123097-16431-4-git-send-email-sumit.garg@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v2,1/4] tee: add bus driver framework for TEE based devices | expand |
On Thu, 10 Jan 2019 at 19:53, Daniel Thompson <daniel.thompson@linaro.org> wrote: > > On Thu, Jan 10, 2019 at 05:54:56PM +0530, Sumit Garg wrote: > > This flag indicates that requests in this context should not wait for > > tee-supplicant daemon to be started if not present and just return > > with an error code. It is needed for requests which should be > > non-blocking in nature like ones arising from TEE based kernel drivers > > or any in kernel api that uses TEE internal client interface. > > This patch seems out of order in the patch set: Doesn't > optee_enumarate_devices() require this feature if it is to > work correctly with a TEE that does not implement the enumeate pTA. > > If so better to implement the feature first so that > optee_emumerate_devices() works correctly when it first appears. > Agree, will make this patch as #2 in next version. > > > > Signed-off-by: Sumit Garg <sumit.garg@linaro.org> > > --- > > drivers/tee/optee/supp.c | 10 +++++++++- > > drivers/tee/tee_core.c | 2 ++ > > include/linux/tee_drv.h | 6 ++++++ > > 3 files changed, 17 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/tee/optee/supp.c b/drivers/tee/optee/supp.c > > index 43626e1..92f56b8 100644 > > --- a/drivers/tee/optee/supp.c > > +++ b/drivers/tee/optee/supp.c > > @@ -88,10 +88,18 @@ u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params, > > { > > struct optee *optee = tee_get_drvdata(ctx->teedev); > > struct optee_supp *supp = &optee->supp; > > - struct optee_supp_req *req = kzalloc(sizeof(*req), GFP_KERNEL); > > + struct optee_supp_req *req; > > bool interruptable; > > u32 ret; > > > > + /* > > + * Return in case there is no supplicant available and > > + * non-blocking request. > > + */ > > + if (!supp->ctx && ctx->supp_nowait) > > + return TEEC_ERROR_COMMUNICATION; > > + > > + req = kzalloc(sizeof(*req), GFP_KERNEL); > > if (!req) > > return TEEC_ERROR_OUT_OF_MEMORY; > > > > diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c > > index 9ddb89e..5d6c317 100644 > > --- a/drivers/tee/tee_core.c > > +++ b/drivers/tee/tee_core.c > > @@ -105,6 +105,7 @@ static int tee_open(struct inode *inode, struct file *filp) > > if (IS_ERR(ctx)) > > return PTR_ERR(ctx); > > > > + ctx->supp_nowait = false; > > filp->private_data = ctx; > > return 0; > > } > > @@ -981,6 +982,7 @@ tee_client_open_context(struct tee_context *start, > > } while (IS_ERR(ctx) && PTR_ERR(ctx) != -ENOMEM); > > > > put_device(put_dev); > > + ctx->supp_nowait = true; > > Why automatically set supp_nowait inside open_context() ? > I think this is the default behaviour (non-blocking request) that any in kernel client would expect. Also this flag could be configured again before call to open_session() if any in kernel client requires different behaviour. -Sumit > > > return ctx; > > } > > EXPORT_SYMBOL_GPL(tee_client_open_context); > > diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h > > index ed16bf1..fe1a920 100644 > > --- a/include/linux/tee_drv.h > > +++ b/include/linux/tee_drv.h > > @@ -49,6 +49,11 @@ struct tee_shm_pool; > > * @releasing: flag that indicates if context is being released right now. > > * It is needed to break circular dependency on context during > > * shared memory release. > > + * @supp_nowait: flag that indicates that requests in this context should not > > + * wait for tee-supplicant daemon to be started if not present > > + * and just return with an error code. It is needed for requests > > + * that arises from TEE based kernel drivers that should be > > + * non-blocking in nature. > > */ > > struct tee_context { > > struct tee_device *teedev; > > @@ -56,6 +61,7 @@ struct tee_context { > > void *data; > > struct kref refcount; > > bool releasing; > > + bool supp_nowait; > > }; > > > > struct tee_param_memref { > > -- > > 2.7.4 > >
On Fri, Jan 11, 2019 at 01:00:49PM +0530, Sumit Garg wrote: > On Thu, 10 Jan 2019 at 19:53, Daniel Thompson > <daniel.thompson@linaro.org> wrote: > > > diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c > > > index 9ddb89e..5d6c317 100644 > > > --- a/drivers/tee/tee_core.c > > > +++ b/drivers/tee/tee_core.c > > > @@ -105,6 +105,7 @@ static int tee_open(struct inode *inode, struct file *filp) > > > if (IS_ERR(ctx)) > > > return PTR_ERR(ctx); > > > > > > + ctx->supp_nowait = false; > > > filp->private_data = ctx; > > > return 0; > > > } > > > @@ -981,6 +982,7 @@ tee_client_open_context(struct tee_context *start, > > > } while (IS_ERR(ctx) && PTR_ERR(ctx) != -ENOMEM); > > > > > > put_device(put_dev); > > > + ctx->supp_nowait = true; > > > > Why automatically set supp_nowait inside open_context() ? > > > > I think this is the default behaviour (non-blocking request) that any > in kernel client would expect. Also this flag could be configured > again before call to open_session() if any in kernel client requires > different behaviour. Makes sense. I think this is a deep enough behaviour to warrant proper commenting though. Daniel.
On Fri, 11 Jan 2019 at 15:24, Daniel Thompson <daniel.thompson@linaro.org> wrote: > > On Fri, Jan 11, 2019 at 01:00:49PM +0530, Sumit Garg wrote: > > On Thu, 10 Jan 2019 at 19:53, Daniel Thompson > > <daniel.thompson@linaro.org> wrote: > > > > diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c > > > > index 9ddb89e..5d6c317 100644 > > > > --- a/drivers/tee/tee_core.c > > > > +++ b/drivers/tee/tee_core.c > > > > @@ -105,6 +105,7 @@ static int tee_open(struct inode *inode, struct file *filp) > > > > if (IS_ERR(ctx)) > > > > return PTR_ERR(ctx); > > > > > > > > + ctx->supp_nowait = false; > > > > filp->private_data = ctx; > > > > return 0; > > > > } > > > > @@ -981,6 +982,7 @@ tee_client_open_context(struct tee_context *start, > > > > } while (IS_ERR(ctx) && PTR_ERR(ctx) != -ENOMEM); > > > > > > > > put_device(put_dev); > > > > + ctx->supp_nowait = true; > > > > > > Why automatically set supp_nowait inside open_context() ? > > > > > > > I think this is the default behaviour (non-blocking request) that any > > in kernel client would expect. Also this flag could be configured > > again before call to open_session() if any in kernel client requires > > different behaviour. > > Makes sense. I think this is a deep enough behaviour to warrant proper > commenting though. > Sure, will add comments. -Sumit > > Daniel.
diff --git a/drivers/tee/optee/supp.c b/drivers/tee/optee/supp.c index 43626e1..92f56b8 100644 --- a/drivers/tee/optee/supp.c +++ b/drivers/tee/optee/supp.c @@ -88,10 +88,18 @@ u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params, { struct optee *optee = tee_get_drvdata(ctx->teedev); struct optee_supp *supp = &optee->supp; - struct optee_supp_req *req = kzalloc(sizeof(*req), GFP_KERNEL); + struct optee_supp_req *req; bool interruptable; u32 ret; + /* + * Return in case there is no supplicant available and + * non-blocking request. + */ + if (!supp->ctx && ctx->supp_nowait) + return TEEC_ERROR_COMMUNICATION; + + req = kzalloc(sizeof(*req), GFP_KERNEL); if (!req) return TEEC_ERROR_OUT_OF_MEMORY; diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c index 9ddb89e..5d6c317 100644 --- a/drivers/tee/tee_core.c +++ b/drivers/tee/tee_core.c @@ -105,6 +105,7 @@ static int tee_open(struct inode *inode, struct file *filp) if (IS_ERR(ctx)) return PTR_ERR(ctx); + ctx->supp_nowait = false; filp->private_data = ctx; return 0; } @@ -981,6 +982,7 @@ tee_client_open_context(struct tee_context *start, } while (IS_ERR(ctx) && PTR_ERR(ctx) != -ENOMEM); put_device(put_dev); + ctx->supp_nowait = true; return ctx; } EXPORT_SYMBOL_GPL(tee_client_open_context); diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h index ed16bf1..fe1a920 100644 --- a/include/linux/tee_drv.h +++ b/include/linux/tee_drv.h @@ -49,6 +49,11 @@ struct tee_shm_pool; * @releasing: flag that indicates if context is being released right now. * It is needed to break circular dependency on context during * shared memory release. + * @supp_nowait: flag that indicates that requests in this context should not + * wait for tee-supplicant daemon to be started if not present + * and just return with an error code. It is needed for requests + * that arises from TEE based kernel drivers that should be + * non-blocking in nature. */ struct tee_context { struct tee_device *teedev; @@ -56,6 +61,7 @@ struct tee_context { void *data; struct kref refcount; bool releasing; + bool supp_nowait; }; struct tee_param_memref {
This flag indicates that requests in this context should not wait for tee-supplicant daemon to be started if not present and just return with an error code. It is needed for requests which should be non-blocking in nature like ones arising from TEE based kernel drivers or any in kernel api that uses TEE internal client interface. Signed-off-by: Sumit Garg <sumit.garg@linaro.org> --- drivers/tee/optee/supp.c | 10 +++++++++- drivers/tee/tee_core.c | 2 ++ include/linux/tee_drv.h | 6 ++++++ 3 files changed, 17 insertions(+), 1 deletion(-) -- 2.7.4