| Message ID | 20230124100215.1671472-1-etienne.carriere@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v3] optee: add per cpu asynchronous notification | expand |
Hi Etienne, On Tue, 24 Jan 2023 at 15:33, Etienne Carriere <etienne.carriere@linaro.org> wrote: > > Implements use of per-cpu irq for optee asynchronous notification. > > Existing optee async notif implementation allows OP-TE world to s/OP-TE/OP-TEE/ > raise an interrupt for which Linux optee driver will query pending > events bound to waiting tasks in Linux world or threaded bottom half > tasks to be invoked in TEE world. This change allows the signaling > interrupt to be a per-cpu interrupt as with Arm GIC PPIs. This description says what you have done but doesn't mention why? IOW, why do you need a per-cpu interrupt for async notifications? > > Cc: Jens Wiklander <jens.wiklander@linaro.org> > Cc: Sumit Garg <sumit.garg@linaro.org> > Cc: Marc Zyngier <maz@kernel.org> > > Co-developed-by: Alexandre Torgue <alexandre.torgue@foss.st.com> > Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com> > Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org> > --- > Changes since v2: > - Irq and per-cpu irq no more share the primary same handler function > but have a common irq_handler() helper function. > - Removed useless spinlocks. > - Wrapped lines > 80 char. > > Changes since v1: > - Fixed missing __percpu attribute reported by kernel test robot. > - Rephrased commit message and added Cc tags. > --- > drivers/tee/optee/optee_private.h | 22 +++++++ > drivers/tee/optee/smc_abi.c | 97 +++++++++++++++++++++++++++++-- > 2 files changed, 115 insertions(+), 4 deletions(-) > > diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h > index 04ae58892608..e5bd3548691f 100644 > --- a/drivers/tee/optee/optee_private.h > +++ b/drivers/tee/optee/optee_private.h > @@ -94,11 +94,33 @@ struct optee_supp { > struct completion reqs_c; > }; > > +/* > + * struct optee_pcpu - per cpu notif private struct passed to work functions > + * @optee optee device reference > + */ > +struct optee_pcpu { > + struct optee *optee; > +}; > + > +/* > + * struct optee_smc - optee smc communication struct > + * @invoke_fn handler function to invoke secure monitor > + * @memremaped_shm virtual address of memory in shared memory pool > + * @sec_caps: secure world capabilities defined by > + * OPTEE_SMC_SEC_CAP_* in optee_smc.h > + * @notif_irq interrupt used as async notification by OP-TEE or 0 > + * @optee_pcpu per_cpu optee instance for per cpu work or NULL > + * @notif_pcpu_wq workqueue for per cpu aynchronous notification or NULL > + * @notif_pcpu_work work for per cpu asynchronous notification > + */ > struct optee_smc { > optee_invoke_fn *invoke_fn; > void *memremaped_shm; > u32 sec_caps; > unsigned int notif_irq; > + struct optee_pcpu __percpu *optee_pcpu; > + struct workqueue_struct *notif_pcpu_wq; > + struct work_struct notif_pcpu_work; > }; > > /** > diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c > index a1c1fa1a9c28..eff35f66399e 100644 > --- a/drivers/tee/optee/smc_abi.c > +++ b/drivers/tee/optee/smc_abi.c > @@ -991,9 +991,8 @@ static u32 get_async_notif_value(optee_invoke_fn *invoke_fn, bool *value_valid, > return res.a1; > } > > -static irqreturn_t notif_irq_handler(int irq, void *dev_id) > +static irqreturn_t irq_handler(struct optee *optee) > { > - struct optee *optee = dev_id; > bool do_bottom_half = false; > bool value_valid; > bool value_pending; > @@ -1016,6 +1015,11 @@ static irqreturn_t notif_irq_handler(int irq, void *dev_id) > return IRQ_HANDLED; > } > > +static irqreturn_t notif_irq_handler(int irq, void *dev_id) > +{ > + return irq_handler((struct optee *)dev_id); > +} > + > static irqreturn_t notif_irq_thread_fn(int irq, void *dev_id) > { > struct optee *optee = dev_id; > @@ -1025,7 +1029,7 @@ static irqreturn_t notif_irq_thread_fn(int irq, void *dev_id) > return IRQ_HANDLED; > } > > -static int optee_smc_notif_init_irq(struct optee *optee, u_int irq) > +static int init_irq(struct optee *optee, u_int irq) > { > int rc; > > @@ -1040,12 +1044,97 @@ static int optee_smc_notif_init_irq(struct optee *optee, u_int irq) > return 0; > } > > +static irqreturn_t notif_pcpu_irq_handler(int irq, void *dev_id) > +{ > + struct optee_pcpu __percpu *pcpu = (struct optee_pcpu *)dev_id; > + struct optee *optee = pcpu->optee; > + > + if (irq_handler(optee) == IRQ_WAKE_THREAD) > + queue_work(optee->smc.notif_pcpu_wq, > + &optee->smc.notif_pcpu_work); > + > + return IRQ_HANDLED; > +} > + > +static void notif_pcpu_irq_work_fn(struct work_struct *work) > +{ > + struct optee_smc *optee_smc = container_of(work, struct optee_smc, > + notif_pcpu_work); > + struct optee *optee = container_of(optee_smc, struct optee, smc); > + > + optee_smc_do_bottom_half(optee->ctx); > +} > + > +static int init_pcpu_irq(struct optee *optee, u_int irq) > +{ > + struct optee_pcpu __percpu *optee_pcpu; > + int cpu; > + int rc; > + > + optee_pcpu = alloc_percpu(struct optee_pcpu); > + if (!optee_pcpu) > + return -ENOMEM; > + > + for_each_present_cpu(cpu) { > + struct optee_pcpu __percpu *p = per_cpu_ptr(optee_pcpu, cpu); > + > + p->optee = optee; > + } > + > + rc = request_percpu_irq(irq, notif_pcpu_irq_handler, > + "optee_pcpu_notification", optee_pcpu); > + if (rc) > + goto err_free_pcpu; > + > + enable_percpu_irq(irq, 0); > + > + INIT_WORK(&optee->smc.notif_pcpu_work, notif_pcpu_irq_work_fn); > + optee->smc.notif_pcpu_wq = create_workqueue("optee_pcpu_notification"); > + if (!optee->smc.notif_pcpu_wq) { > + rc = -EINVAL; > + goto err_free_pcpu_irq; > + } > + > + optee->smc.optee_pcpu = optee_pcpu; > + optee->smc.notif_irq = irq; > + > + return 0; > + > +err_free_pcpu_irq: > + disable_percpu_irq(irq); > + free_percpu_irq(irq, optee_pcpu); > +err_free_pcpu: > + free_percpu(optee_pcpu); > + > + return rc; > +} > + > +static int optee_smc_notif_init_irq(struct optee *optee, u_int irq) > +{ > + if (irq_is_percpu_devid(irq)) You need to update OP-TEE DT binding as well to say that the interrupt can be a PPI as well. -Sumit > + return init_pcpu_irq(optee, irq); > + else > + return init_irq(optee, irq); > +} > + > +static void uninit_pcpu_irq(struct optee *optee) > +{ > + disable_percpu_irq(optee->smc.notif_irq); > + > + free_percpu_irq(optee->smc.notif_irq, optee->smc.optee_pcpu); > + free_percpu(optee->smc.optee_pcpu); > +} > + > static void optee_smc_notif_uninit_irq(struct optee *optee) > { > if (optee->smc.sec_caps & OPTEE_SMC_SEC_CAP_ASYNC_NOTIF) { > optee_smc_stop_async_notif(optee->ctx); > if (optee->smc.notif_irq) { > - free_irq(optee->smc.notif_irq, optee); > + if (irq_is_percpu_devid(optee->smc.notif_irq)) > + uninit_pcpu_irq(optee); > + else > + free_irq(optee->smc.notif_irq, optee); > + > irq_dispose_mapping(optee->smc.notif_irq); > } > } > -- > 2.25.1 >
diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h index 04ae58892608..e5bd3548691f 100644 --- a/drivers/tee/optee/optee_private.h +++ b/drivers/tee/optee/optee_private.h @@ -94,11 +94,33 @@ struct optee_supp { struct completion reqs_c; }; +/* + * struct optee_pcpu - per cpu notif private struct passed to work functions + * @optee optee device reference + */ +struct optee_pcpu { + struct optee *optee; +}; + +/* + * struct optee_smc - optee smc communication struct + * @invoke_fn handler function to invoke secure monitor + * @memremaped_shm virtual address of memory in shared memory pool + * @sec_caps: secure world capabilities defined by + * OPTEE_SMC_SEC_CAP_* in optee_smc.h + * @notif_irq interrupt used as async notification by OP-TEE or 0 + * @optee_pcpu per_cpu optee instance for per cpu work or NULL + * @notif_pcpu_wq workqueue for per cpu aynchronous notification or NULL + * @notif_pcpu_work work for per cpu asynchronous notification + */ struct optee_smc { optee_invoke_fn *invoke_fn; void *memremaped_shm; u32 sec_caps; unsigned int notif_irq; + struct optee_pcpu __percpu *optee_pcpu; + struct workqueue_struct *notif_pcpu_wq; + struct work_struct notif_pcpu_work; }; /** diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c index a1c1fa1a9c28..eff35f66399e 100644 --- a/drivers/tee/optee/smc_abi.c +++ b/drivers/tee/optee/smc_abi.c @@ -991,9 +991,8 @@ static u32 get_async_notif_value(optee_invoke_fn *invoke_fn, bool *value_valid, return res.a1; } -static irqreturn_t notif_irq_handler(int irq, void *dev_id) +static irqreturn_t irq_handler(struct optee *optee) { - struct optee *optee = dev_id; bool do_bottom_half = false; bool value_valid; bool value_pending; @@ -1016,6 +1015,11 @@ static irqreturn_t notif_irq_handler(int irq, void *dev_id) return IRQ_HANDLED; } +static irqreturn_t notif_irq_handler(int irq, void *dev_id) +{ + return irq_handler((struct optee *)dev_id); +} + static irqreturn_t notif_irq_thread_fn(int irq, void *dev_id) { struct optee *optee = dev_id; @@ -1025,7 +1029,7 @@ static irqreturn_t notif_irq_thread_fn(int irq, void *dev_id) return IRQ_HANDLED; } -static int optee_smc_notif_init_irq(struct optee *optee, u_int irq) +static int init_irq(struct optee *optee, u_int irq) { int rc; @@ -1040,12 +1044,97 @@ static int optee_smc_notif_init_irq(struct optee *optee, u_int irq) return 0; } +static irqreturn_t notif_pcpu_irq_handler(int irq, void *dev_id) +{ + struct optee_pcpu __percpu *pcpu = (struct optee_pcpu *)dev_id; + struct optee *optee = pcpu->optee; + + if (irq_handler(optee) == IRQ_WAKE_THREAD) + queue_work(optee->smc.notif_pcpu_wq, + &optee->smc.notif_pcpu_work); + + return IRQ_HANDLED; +} + +static void notif_pcpu_irq_work_fn(struct work_struct *work) +{ + struct optee_smc *optee_smc = container_of(work, struct optee_smc, + notif_pcpu_work); + struct optee *optee = container_of(optee_smc, struct optee, smc); + + optee_smc_do_bottom_half(optee->ctx); +} + +static int init_pcpu_irq(struct optee *optee, u_int irq) +{ + struct optee_pcpu __percpu *optee_pcpu; + int cpu; + int rc; + + optee_pcpu = alloc_percpu(struct optee_pcpu); + if (!optee_pcpu) + return -ENOMEM; + + for_each_present_cpu(cpu) { + struct optee_pcpu __percpu *p = per_cpu_ptr(optee_pcpu, cpu); + + p->optee = optee; + } + + rc = request_percpu_irq(irq, notif_pcpu_irq_handler, + "optee_pcpu_notification", optee_pcpu); + if (rc) + goto err_free_pcpu; + + enable_percpu_irq(irq, 0); + + INIT_WORK(&optee->smc.notif_pcpu_work, notif_pcpu_irq_work_fn); + optee->smc.notif_pcpu_wq = create_workqueue("optee_pcpu_notification"); + if (!optee->smc.notif_pcpu_wq) { + rc = -EINVAL; + goto err_free_pcpu_irq; + } + + optee->smc.optee_pcpu = optee_pcpu; + optee->smc.notif_irq = irq; + + return 0; + +err_free_pcpu_irq: + disable_percpu_irq(irq); + free_percpu_irq(irq, optee_pcpu); +err_free_pcpu: + free_percpu(optee_pcpu); + + return rc; +} + +static int optee_smc_notif_init_irq(struct optee *optee, u_int irq) +{ + if (irq_is_percpu_devid(irq)) + return init_pcpu_irq(optee, irq); + else + return init_irq(optee, irq); +} + +static void uninit_pcpu_irq(struct optee *optee) +{ + disable_percpu_irq(optee->smc.notif_irq); + + free_percpu_irq(optee->smc.notif_irq, optee->smc.optee_pcpu); + free_percpu(optee->smc.optee_pcpu); +} + static void optee_smc_notif_uninit_irq(struct optee *optee) { if (optee->smc.sec_caps & OPTEE_SMC_SEC_CAP_ASYNC_NOTIF) { optee_smc_stop_async_notif(optee->ctx); if (optee->smc.notif_irq) { - free_irq(optee->smc.notif_irq, optee); + if (irq_is_percpu_devid(optee->smc.notif_irq)) + uninit_pcpu_irq(optee); + else + free_irq(optee->smc.notif_irq, optee); + irq_dispose_mapping(optee->smc.notif_irq); } }