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Message-Id: <20230317172859.989650-2-etienne.carriere@linaro.org>
Date: Fri, 17 Mar 2023 18:28:59 +0100
From: Etienne Carriere <etienne.carriere@...aro.org>
To: linux-kernel@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org,
Sumit Garg <sumit.garg@...aro.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Jens Wiklander <jens.wiklander@...aro.org>,
Etienne Carriere <etienne.carriere@...aro.org>,
Marc Zyngier <maz@...nel.org>,
Alexandre Torgue <alexandre.torgue@...s.st.com>
Subject: [PATCH v5 2/2] 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@...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 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 | 125 +++++++++++++++++++++++++++++-
2 files changed, 145 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
+ * @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..a2473fbe2461 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 +1063,106 @@ 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, 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;
+
+ 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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