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optee: add per cpu asynchronous notification 

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@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>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
[JW: fixing a spell error in @notif_pcpu_wq description]
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
This commit is contained in:
Etienne Carriere 2023-03-22 14:22:12 +01:00 committed by Jens Wiklander
parent 0d0eaa780b
commit b3b4ced12c
2 changed files with 142 additions and 4 deletions
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24
drivers/tee/optee/optee_private.h
View File

@ -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 asynchronous notification or NULL
* @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;
};
/**

122
drivers/tee/optee/smc_abi.c
View File

@ -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);
}
}