[PATCH v6 1/2] dt-bindings: optee driver interrupt can be a per-cpu interrupt

[PATCH v6 1/2] dt-bindings: optee driver interrupt can be a per-cpu interrupt

[Etienne Carriere]

Explicit in optee firmware device tree bindings that the interrupt
used by optee driver for async notification can be a peripheral
interrupt or a per-cpu interrupt.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
---
No change since v5

No change since v4

Changes since v3:
- Patch added in this v4 to address review comments.
---
 .../devicetree/bindings/arm/firmware/linaro,optee-tz.yaml      | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
index d4dc0749f9fd..5d033570b57b 100644
--- a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
+++ b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
@@ -28,7 +28,8 @@ properties:
     maxItems: 1
     description: |
       This interrupt which is used to signal an event by the secure world
-      software is expected to be edge-triggered.
+      software is expected to be either a per-cpu interrupt or an
+      edge-triggered peripheral interrupt.
 
   method:
     enum: [smc, hvc]
-- 
2.25.1

[PATCH v6 1/2] dt-bindings: optee driver interrupt can be a per-cpu interrupt

[Etienne Carriere]

Explicit in optee firmware device tree bindings that the interrupt
used by optee driver for async notification can be a peripheral
interrupt or a per-cpu interrupt.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
---
No change since v5

No change since v4

Changes since v3:
- Patch added in this v4 to address review comments.
---
 .../devicetree/bindings/arm/firmware/linaro,optee-tz.yaml      | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
index d4dc0749f9fd..5d033570b57b 100644
--- a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
+++ b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
@@ -28,7 +28,8 @@ properties:
     maxItems: 1
     description: |
       This interrupt which is used to signal an event by the secure world
-      software is expected to be edge-triggered.
+      software is expected to be either a per-cpu interrupt or an
+      edge-triggered peripheral interrupt.
 
   method:
     enum: [smc, hvc]
-- 
2.25.1


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[PATCH v6 2/2] optee: add per cpu asynchronous notification

[Etienne Carriere]

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>
---
Changes since v5:
- Removed spurious __percpu attributes reported by kernel test robot
  (https://lore.kernel.org/lkml/202303190039.RsU7kCIu-lkp@intel.com/).

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
+ * @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

[PATCH v6 2/2] optee: add per cpu asynchronous notification

[Etienne Carriere]

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>
---
Changes since v5:
- Removed spurious __percpu attributes reported by kernel test robot
  (https://lore.kernel.org/lkml/202303190039.RsU7kCIu-lkp@intel.com/).

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
+ * @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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Re: [PATCH v6 1/2] dt-bindings: optee driver interrupt can be a per-cpu interrupt

[Sumit Garg]

On Wed, 22 Mar 2023 at 18:52, Etienne Carriere
<etienne.carriere@linaro.org> wrote:
>
> Explicit in optee firmware device tree bindings that the interrupt
> used by optee driver for async notification can be a peripheral
> interrupt or a per-cpu interrupt.
>
> Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
> ---
> No change since v5
>

Reviewed-by: Sumit Garg <sumit.garg@linaro.org>

-Sumit

> No change since v4
>
> Changes since v3:
> - Patch added in this v4 to address review comments.
> ---
>  .../devicetree/bindings/arm/firmware/linaro,optee-tz.yaml      | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
> index d4dc0749f9fd..5d033570b57b 100644
> --- a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
> +++ b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
> @@ -28,7 +28,8 @@ properties:
>      maxItems: 1
>      description: |
>        This interrupt which is used to signal an event by the secure world
> -      software is expected to be edge-triggered.
> +      software is expected to be either a per-cpu interrupt or an
> +      edge-triggered peripheral interrupt.
>
>    method:
>      enum: [smc, hvc]
> --
> 2.25.1
>

Re: [PATCH v6 1/2] dt-bindings: optee driver interrupt can be a per-cpu interrupt

[Sumit Garg]

On Wed, 22 Mar 2023 at 18:52, Etienne Carriere
<etienne.carriere@linaro.org> wrote:
>
> Explicit in optee firmware device tree bindings that the interrupt
> used by optee driver for async notification can be a peripheral
> interrupt or a per-cpu interrupt.
>
> Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
> ---
> No change since v5
>

Reviewed-by: Sumit Garg <sumit.garg@linaro.org>

-Sumit

> No change since v4
>
> Changes since v3:
> - Patch added in this v4 to address review comments.
> ---
>  .../devicetree/bindings/arm/firmware/linaro,optee-tz.yaml      | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
> index d4dc0749f9fd..5d033570b57b 100644
> --- a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
> +++ b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
> @@ -28,7 +28,8 @@ properties:
>      maxItems: 1
>      description: |
>        This interrupt which is used to signal an event by the secure world
> -      software is expected to be edge-triggered.
> +      software is expected to be either a per-cpu interrupt or an
> +      edge-triggered peripheral interrupt.
>
>    method:
>      enum: [smc, hvc]
> --
> 2.25.1
>

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linux-arm-kernel@lists.infradead.org
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Re: [PATCH v6 2/2] optee: add per cpu asynchronous notification

[Sumit Garg]

On Wed, 22 Mar 2023 at 18:52, Etienne Carriere
<etienne.carriere@linaro.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@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 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@linaro.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/

-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
>

Re: [PATCH v6 2/2] optee: add per cpu asynchronous notification

[Sumit Garg]

On Wed, 22 Mar 2023 at 18:52, Etienne Carriere
<etienne.carriere@linaro.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@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 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@linaro.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/

-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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Re: [PATCH v6 2/2] optee: add per cpu asynchronous notification

[Jens Wiklander]

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@linaro.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@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 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@linaro.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
> >

Re: [PATCH v6 2/2] optee: add per cpu asynchronous notification

[Jens Wiklander]

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@linaro.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@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 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@linaro.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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Re: [PATCH v6 1/2] dt-bindings: optee driver interrupt can be a per-cpu interrupt

[Jens Wiklander]

On Wed, Mar 22, 2023 at 08:26:22PM +0530, Sumit Garg wrote:
> On Wed, 22 Mar 2023 at 18:52, Etienne Carriere
> <etienne.carriere@linaro.org> wrote:
> >
> > Explicit in optee firmware device tree bindings that the interrupt
> > used by optee driver for async notification can be a peripheral
> > interrupt or a per-cpu interrupt.
> >
> > Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
> > ---
> > No change since v5
> >
> 
> Reviewed-by: Sumit Garg <sumit.garg@linaro.org>

I'm picking up this.

Thanks,
Jens

> 
> -Sumit
> 
> > No change since v4
> >
> > Changes since v3:
> > - Patch added in this v4 to address review comments.
> > ---
> >  .../devicetree/bindings/arm/firmware/linaro,optee-tz.yaml      | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
> > index d4dc0749f9fd..5d033570b57b 100644
> > --- a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
> > +++ b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
> > @@ -28,7 +28,8 @@ properties:
> >      maxItems: 1
> >      description: |
> >        This interrupt which is used to signal an event by the secure world
> > -      software is expected to be edge-triggered.
> > +      software is expected to be either a per-cpu interrupt or an
> > +      edge-triggered peripheral interrupt.
> >
> >    method:
> >      enum: [smc, hvc]
> > --
> > 2.25.1
> >

Re: [PATCH v6 1/2] dt-bindings: optee driver interrupt can be a per-cpu interrupt

[Jens Wiklander]

On Wed, Mar 22, 2023 at 08:26:22PM +0530, Sumit Garg wrote:
> On Wed, 22 Mar 2023 at 18:52, Etienne Carriere
> <etienne.carriere@linaro.org> wrote:
> >
> > Explicit in optee firmware device tree bindings that the interrupt
> > used by optee driver for async notification can be a peripheral
> > interrupt or a per-cpu interrupt.
> >
> > Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
> > ---
> > No change since v5
> >
> 
> Reviewed-by: Sumit Garg <sumit.garg@linaro.org>

I'm picking up this.

Thanks,
Jens

> 
> -Sumit
> 
> > No change since v4
> >
> > Changes since v3:
> > - Patch added in this v4 to address review comments.
> > ---
> >  .../devicetree/bindings/arm/firmware/linaro,optee-tz.yaml      | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
> > index d4dc0749f9fd..5d033570b57b 100644
> > --- a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
> > +++ b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
> > @@ -28,7 +28,8 @@ properties:
> >      maxItems: 1
> >      description: |
> >        This interrupt which is used to signal an event by the secure world
> > -      software is expected to be edge-triggered.
> > +      software is expected to be either a per-cpu interrupt or an
> > +      edge-triggered peripheral interrupt.
> >
> >    method:
> >      enum: [smc, hvc]
> > --
> > 2.25.1
> >

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