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Message-ID: <20230330092210.GA990388@rayden>
Date: Thu, 30 Mar 2023 11:22:10 +0200
From: Jens Wiklander <jens.wiklander@...aro.org>
To: Sumit Garg <sumit.garg@...aro.org>
Cc: Etienne Carriere <etienne.carriere@...aro.org>,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
op-tee@...ts.trustedfirmware.org, Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Marc Zyngier <maz@...nel.org>,
Alexandre Torgue <alexandre.torgue@...s.st.com>
Subject: Re: [PATCH v6 2/2] optee: add per cpu asynchronous notification
On Wed, Mar 22, 2023 at 08:28:11PM +0530, Sumit Garg wrote:
> On Wed, 22 Mar 2023 at 18:52, Etienne Carriere
> <etienne.carriere@...aro.org> wrote:
> >
> > Implements use of per-cpu irq for optee asynchronous notification.
> >
> > Existing optee async notif implementation allows OP-TEE world to
> > raise an interrupt on which Linux optee driver will query some pending
> > events. This change allows the signaling interrupt to be a per-cpu
> > interrupt as with Arm GIC PPIs. Using a PPI instead of an SPI is useful
> > when no GIC lines are provisioned in the chip design and there are spare
> > PPI lines.
> >
> > Cc: Jens Wiklander <jens.wiklander@...aro.org>
> > Cc: Sumit Garg <sumit.garg@...aro.org>
> > Cc: Marc Zyngier <maz@...nel.org>
> >
> > Co-developed-by: Alexandre Torgue <alexandre.torgue@...s.st.com>
> > Signed-off-by: Alexandre Torgue <alexandre.torgue@...s.st.com>
> > Signed-off-by: Etienne Carriere <etienne.carriere@...aro.org>
> > ---
> > Changes since v5:
> > - Removed spurious __percpu attributes reported by kernel test robot
> > (https://lore.kernel.org/lkml/202303190039.RsU7kCIu-lkp@intel.com/).
> >
>
> Apart from nit below, feel free to add:
>
> Reviewed-by: Sumit Garg <sumit.garg@...aro.org>
>
> > Changes since v4:
> > - Used cpuhp_setup_state()/cpuhp_remove_state() to enable/disable the
> > per-cpu interrupt and let CPU hotplug also manage it.
> > - Added a call to destroy_workqueue() that was missing in uninit_pcpu_irq().
> > - Rephrased commit message.
> >
> > Changes since v3:
> > - Fixed typo in commit message.
> > - Added few words in commit message about why we do this change.
> > - Appended a 2nd commit to the series for request DT bindings update.
> >
> > 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 | 24 ++++++
> > drivers/tee/optee/smc_abi.c | 122 +++++++++++++++++++++++++++++-
> > 2 files changed, 142 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
> > index 04ae58892608..6129d43dd354 100644
> > --- a/drivers/tee/optee/optee_private.h
> > +++ b/drivers/tee/optee/optee_private.h
> > @@ -94,11 +94,35 @@ 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
>
> s/aynchronous/asynchronous/
I'm picking up this and I'll fix the spell error too.
Thanks,
Jens
>
> -Sumit
>
> > + * @notif_pcpu_work work for per cpu asynchronous notification
> > + * @notif_cpuhp_state CPU hotplug state assigned for pcpu interrupt management
> > + */
> > 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;
> > + unsigned int notif_cpuhp_state;
> > };
> >
> > /**
> > diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c
> > index a1c1fa1a9c28..de7ac9a46354 100644
> > --- a/drivers/tee/optee/smc_abi.c
> > +++ b/drivers/tee/optee/smc_abi.c
> > @@ -52,6 +52,23 @@
> > */
> > #define OPTEE_MIN_STATIC_POOL_ALIGN 9 /* 512 bytes aligned */
> >
> > +/* SMC ABI considers at most a single TEE firmware */
> > +static unsigned int pcpu_irq_num;
> > +
> > +static int optee_cpuhp_enable_pcpu_irq(unsigned int cpu)
> > +{
> > + enable_percpu_irq(pcpu_irq_num, IRQ_TYPE_NONE);
> > +
> > + return 0;
> > +}
> > +
> > +static int optee_cpuhp_disable_pcpu_irq(unsigned int cpu)
> > +{
> > + disable_percpu_irq(pcpu_irq_num);
> > +
> > + return 0;
> > +}
> > +
> > /*
> > * 1. Convert between struct tee_param and struct optee_msg_param
> > *
> > @@ -991,9 +1008,8 @@ 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 +1032,13 @@ 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)
> > +{
> > + struct optee *optee = dev_id;
> > +
> > + return irq_handler(optee);
> > +}
> > +
> > static irqreturn_t notif_irq_thread_fn(int irq, void *dev_id)
> > {
> > struct optee *optee = dev_id;
> > @@ -1025,7 +1048,7 @@ 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 +1063,103 @@ 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 *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, rc;
> > +
> > + optee_pcpu = alloc_percpu(struct optee_pcpu);
> > + if (!optee_pcpu)
> > + return -ENOMEM;
> > +
> > + for_each_present_cpu(cpu)
> > + per_cpu_ptr(optee_pcpu, cpu)->optee = optee;
> > +
> > + rc = request_percpu_irq(irq, notif_pcpu_irq_handler,
> > + "optee_pcpu_notification", optee_pcpu);
> > + if (rc)
> > + goto err_free_pcpu;
> > +
> > + 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;
> > +
> > + pcpu_irq_num = irq;
> > + rc = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "optee/pcpu-notif:starting",
> > + optee_cpuhp_enable_pcpu_irq,
> > + optee_cpuhp_disable_pcpu_irq);
> > + if (!rc)
> > + rc = -EINVAL;
> > + if (rc < 0)
> > + goto err_free_pcpu_irq;
> > +
> > + optee->smc.notif_cpuhp_state = rc;
> > +
> > + return 0;
> > +
> > +err_free_pcpu_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)
> > +{
> > + cpuhp_remove_state(optee->smc.notif_cpuhp_state);
> > +
> > + destroy_workqueue(optee->smc.notif_pcpu_wq);
> > +
> > + 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
> >
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