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Subject[PATCH 1/3] habanalabs: enable all IRQs for user interrupt support
Date
From: Ofir Bitton <obitton@habana.ai>

In order to support user interrupts, driver must enable all MSI-X
interrupts for any case user will trigger them. We differentiate
between a valid user interrupt and a non valid one.

Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
---
drivers/misc/habanalabs/common/device.c | 20 +++++++++--
drivers/misc/habanalabs/common/habanalabs.h | 16 +++++++++
drivers/misc/habanalabs/common/irq.c | 40 +++++++++++++++++++++
3 files changed, 74 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c
index 6948a1c54083..06395c79f07d 100644
--- a/drivers/misc/habanalabs/common/device.c
+++ b/drivers/misc/habanalabs/common/device.c
@@ -1223,7 +1223,7 @@ int hl_device_reset(struct hl_device *hdev, bool hard_reset,
*/
int hl_device_init(struct hl_device *hdev, struct class *hclass)
{
- int i, rc, cq_cnt, cq_ready_cnt;
+ int i, rc, cq_cnt, user_interrupt_cnt, cq_ready_cnt;
char *name;
bool add_cdev_sysfs_on_err = false;

@@ -1312,6 +1312,19 @@ int hl_device_init(struct hl_device *hdev, struct class *hclass)
hdev->completion_queue[i].cq_idx = i;
}

+ user_interrupt_cnt = hdev->asic_prop.user_interrupt_count;
+
+ if (user_interrupt_cnt) {
+ hdev->user_interrupt = kcalloc(user_interrupt_cnt,
+ sizeof(*hdev->user_interrupt),
+ GFP_KERNEL);
+
+ if (!hdev->user_interrupt) {
+ rc = -ENOMEM;
+ goto cq_fini;
+ }
+ }
+
/*
* Initialize the event queue. Must be done before hw_init,
* because there the address of the event queue is being
@@ -1320,7 +1333,7 @@ int hl_device_init(struct hl_device *hdev, struct class *hclass)
rc = hl_eq_init(hdev, &hdev->event_queue);
if (rc) {
dev_err(hdev->dev, "failed to initialize event queue\n");
- goto cq_fini;
+ goto user_interrupts_fini;
}

/* MMU S/W must be initialized before kernel context is created */
@@ -1458,6 +1471,8 @@ int hl_device_init(struct hl_device *hdev, struct class *hclass)
hl_mmu_fini(hdev);
eq_fini:
hl_eq_fini(hdev, &hdev->event_queue);
+user_interrupts_fini:
+ kfree(hdev->user_interrupt);
cq_fini:
for (i = 0 ; i < cq_ready_cnt ; i++)
hl_cq_fini(hdev, &hdev->completion_queue[i]);
@@ -1595,6 +1610,7 @@ void hl_device_fini(struct hl_device *hdev)
for (i = 0 ; i < hdev->asic_prop.completion_queues_count ; i++)
hl_cq_fini(hdev, &hdev->completion_queue[i]);
kfree(hdev->completion_queue);
+ kfree(hdev->user_interrupt);

hl_hw_queues_destroy(hdev);

diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h
index 046bb44f70f9..bb6cb88d7257 100644
--- a/drivers/misc/habanalabs/common/habanalabs.h
+++ b/drivers/misc/habanalabs/common/habanalabs.h
@@ -412,6 +412,7 @@ struct hl_mmu_properties {
* @first_available_user_msix_interrupt: first available msix interrupt
* reserved for the user
* @first_available_cq: first available CQ for the user.
+ * @user_interrupt_count: number of user interrupts.
* @tpc_enabled_mask: which TPCs are enabled.
* @completion_queues_count: number of completion queues.
* @fw_security_disabled: true if security measures are disabled in firmware,
@@ -475,6 +476,7 @@ struct asic_fixed_properties {
u16 first_available_user_mon[HL_MAX_DCORES];
u16 first_available_user_msix_interrupt;
u16 first_available_cq[HL_MAX_DCORES];
+ u16 user_interrupt_count;
u8 tpc_enabled_mask;
u8 completion_queues_count;
u8 fw_security_disabled;
@@ -689,6 +691,16 @@ struct hl_cq {
atomic_t free_slots_cnt;
};

+/**
+ * struct hl_user_interrupt - holds user interrupt information
+ * @hdev: pointer to the device structure
+ * @interrupt_id: msix interrupt id
+ */
+struct hl_user_interrupt {
+ struct hl_device *hdev;
+ u32 interrupt_id;
+};
+
/**
* struct hl_eq - describes the event queue (single one per device)
* @hdev: pointer to the device structure
@@ -1821,6 +1833,7 @@ struct hl_mmu_funcs {
* @asic_name: ASIC specific name.
* @asic_type: ASIC specific type.
* @completion_queue: array of hl_cq.
+ * @user_interrupt: array of hl_user_interrupt.
* @cq_wq: work queues of completion queues for executing work in process
* context.
* @eq_wq: work queue of event queue for executing work in process context.
@@ -1937,6 +1950,7 @@ struct hl_device {
char status[HL_DEV_STS_MAX][HL_STR_MAX];
enum hl_asic_type asic_type;
struct hl_cq *completion_queue;
+ struct hl_user_interrupt *user_interrupt;
struct workqueue_struct **cq_wq;
struct workqueue_struct *eq_wq;
struct hl_ctx *kernel_ctx;
@@ -2158,6 +2172,8 @@ void hl_cq_reset(struct hl_device *hdev, struct hl_cq *q);
void hl_eq_reset(struct hl_device *hdev, struct hl_eq *q);
irqreturn_t hl_irq_handler_cq(int irq, void *arg);
irqreturn_t hl_irq_handler_eq(int irq, void *arg);
+irqreturn_t hl_irq_handler_user_cq(int irq, void *arg);
+irqreturn_t hl_irq_handler_default(int irq, void *arg);
u32 hl_cq_inc_ptr(u32 ptr);

int hl_asid_init(struct hl_device *hdev);
diff --git a/drivers/misc/habanalabs/common/irq.c b/drivers/misc/habanalabs/common/irq.c
index de53fb5f978a..e112da51b1c8 100644
--- a/drivers/misc/habanalabs/common/irq.c
+++ b/drivers/misc/habanalabs/common/irq.c
@@ -137,6 +137,46 @@ irqreturn_t hl_irq_handler_cq(int irq, void *arg)
return IRQ_HANDLED;
}

+/**
+ * hl_irq_handler_user_cq - irq handler for user completion queues
+ *
+ * @irq: irq number
+ * @arg: pointer to user interrupt structure
+ *
+ */
+irqreturn_t hl_irq_handler_user_cq(int irq, void *arg)
+{
+ struct hl_user_interrupt *user_cq = arg;
+ struct hl_device *hdev = user_cq->hdev;
+ u32 interrupt_id = user_cq->interrupt_id;
+
+ dev_info(hdev->dev,
+ "got user completion interrupt id %u",
+ interrupt_id);
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * hl_irq_handler_default - default irq handler
+ *
+ * @irq: irq number
+ * @arg: pointer to user interrupt structure
+ *
+ */
+irqreturn_t hl_irq_handler_default(int irq, void *arg)
+{
+ struct hl_user_interrupt *user_interrupt = arg;
+ struct hl_device *hdev = user_interrupt->hdev;
+ u32 interrupt_id = user_interrupt->interrupt_id;
+
+ dev_err(hdev->dev,
+ "got invalid user interrupt %u",
+ interrupt_id);
+
+ return IRQ_HANDLED;
+}
+
/**
* hl_irq_handler_eq - irq handler for event queue
*
--
2.25.1
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