accel/habanalabs: add support for TPC assert

In order to allow TPC engines to raise an assert, we must expose
the relevant MSIX interrupt to the user so he will configure the engine
correctly. In addition, we implement the corresponding interrupt
handler that will notify the user upon such an event.

Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>

2 files changed, 24 insertions, 3 deletions

diff --git a/drivers/accel/habanalabs/gaudi2/gaudi2.c b/drivers/accel/habanalabs/gaudi2/gaudi2.c
index 7f23363ced9c..846fd65d9f19 100644
--- a/drivers/accel/habanalabs/gaudi2/gaudi2.c
+++ b/drivers/accel/habanalabs/gaudi2/gaudi2.c
@@ -2348,6 +2348,7 @@ static int gaudi2_set_fixed_properties(struct hl_device *hdev)
 					(num_sync_stream_queues * HL_RSVD_MONS);
 
 	prop->first_available_user_interrupt = GAUDI2_IRQ_NUM_USER_FIRST;
+	prop->tpc_interrupt_id = GAUDI2_IRQ_NUM_TPC_ASSERT;
 
 	prop->first_available_cq[0] = GAUDI2_RESERVED_CQ_NUMBER;
 
@@ -3235,6 +3236,9 @@ static void gaudi2_user_interrupt_setup(struct hl_device *hdev)
 	struct asic_fixed_properties *prop = &hdev->asic_prop;
 	int i, j, k;
 
+	/* Initialize TPC interrupt */
+	HL_USR_INTR_STRUCT_INIT(hdev->tpc_interrupt, hdev, 0, HL_USR_INTERRUPT_TPC);
+
 	/* Initialize common user CQ interrupt */
 	HL_USR_INTR_STRUCT_INIT(hdev->common_user_cq_interrupt, hdev,
 				HL_COMMON_USER_CQ_INTERRUPT_ID, HL_USR_INTERRUPT_CQ);
@@ -3892,6 +3896,8 @@ static const char *gaudi2_irq_name(u16 irq_number)
 		return "gaudi2 completion";
 	case GAUDI2_IRQ_NUM_DCORE0_DEC0_NRM ... GAUDI2_IRQ_NUM_SHARED_DEC1_ABNRM:
 		return gaudi2_vdec_irq_name[irq_number - GAUDI2_IRQ_NUM_DCORE0_DEC0_NRM];
+	case GAUDI2_IRQ_NUM_TPC_ASSERT:
+		return "gaudi2 tpc assert";
 	case GAUDI2_IRQ_NUM_USER_FIRST ... GAUDI2_IRQ_NUM_USER_LAST:
 		return "gaudi2 user completion";
 	default:
@@ -4004,6 +4010,15 @@ static int gaudi2_enable_msix(struct hl_device *hdev)
 		goto free_event_irq;
 	}
 
+	irq = pci_irq_vector(hdev->pdev, GAUDI2_IRQ_NUM_TPC_ASSERT);
+	rc = request_threaded_irq(irq, hl_irq_handler_user_interrupt,
+			hl_irq_user_interrupt_thread_handler, IRQF_ONESHOT,
+			gaudi2_irq_name(GAUDI2_IRQ_NUM_TPC_ASSERT), &hdev->tpc_interrupt);
+	if (rc) {
+		dev_err(hdev->dev, "Failed to request IRQ %d", irq);
+		goto free_dec_irq;
+	}
+
 	for (i = GAUDI2_IRQ_NUM_USER_FIRST, j = prop->user_dec_intr_count, user_irq_init_cnt = 0;
 			user_irq_init_cnt < prop->user_interrupt_count;
 			i++, j++, user_irq_init_cnt++) {
@@ -4031,9 +4046,8 @@ free_user_irq:
 		irq = pci_irq_vector(hdev->pdev, i);
 		free_irq(irq, &hdev->user_interrupt[j]);
 	}
-
-	gaudi2_dec_disable_msix(hdev, GAUDI2_IRQ_NUM_SHARED_DEC1_ABNRM + 1);
-
+free_dec_irq:
+	gaudi2_dec_disable_msix(hdev, GAUDI2_IRQ_NUM_DEC_LAST + 1);
 free_event_irq:
 	irq = pci_irq_vector(hdev->pdev, GAUDI2_IRQ_NUM_EVENT_QUEUE);
 	free_irq(irq, cq);
@@ -4065,6 +4079,8 @@ static void gaudi2_sync_irqs(struct hl_device *hdev)
 		synchronize_irq(irq);
 	}
 
+	synchronize_irq(pci_irq_vector(hdev->pdev, GAUDI2_IRQ_NUM_TPC_ASSERT));
+
 	for (i = GAUDI2_IRQ_NUM_USER_FIRST, j = 0 ; j < hdev->asic_prop.user_interrupt_count;
 										i++, j++) {
 		irq = pci_irq_vector(hdev->pdev, i);
@@ -4091,6 +4107,9 @@ static void gaudi2_disable_msix(struct hl_device *hdev)
 
 	gaudi2_dec_disable_msix(hdev, GAUDI2_IRQ_NUM_SHARED_DEC1_ABNRM + 1);
 
+	irq = pci_irq_vector(hdev->pdev, GAUDI2_IRQ_NUM_TPC_ASSERT);
+	free_irq(irq, &hdev->tpc_interrupt);
+
 	for (i = GAUDI2_IRQ_NUM_USER_FIRST, j = prop->user_dec_intr_count, k = 0;
 			k < hdev->asic_prop.user_interrupt_count ; i++, j++, k++) {
 
diff --git a/drivers/accel/habanalabs/gaudi2/gaudi2P.h b/drivers/accel/habanalabs/gaudi2/gaudi2P.h
index 2687404d9d21..f79958b24811 100644
--- a/drivers/accel/habanalabs/gaudi2/gaudi2P.h
+++ b/drivers/accel/habanalabs/gaudi2/gaudi2P.h
@@ -410,9 +410,11 @@ enum gaudi2_irq_num {
 	GAUDI2_IRQ_NUM_SHARED_DEC0_ABNRM,
 	GAUDI2_IRQ_NUM_SHARED_DEC1_NRM,
 	GAUDI2_IRQ_NUM_SHARED_DEC1_ABNRM,
+	GAUDI2_IRQ_NUM_DEC_LAST = GAUDI2_IRQ_NUM_SHARED_DEC1_ABNRM,
 	GAUDI2_IRQ_NUM_COMPLETION,
 	GAUDI2_IRQ_NUM_NIC_PORT_FIRST,
 	GAUDI2_IRQ_NUM_NIC_PORT_LAST = (GAUDI2_IRQ_NUM_NIC_PORT_FIRST + NIC_NUMBER_OF_PORTS - 1),
+	GAUDI2_IRQ_NUM_TPC_ASSERT,
 	GAUDI2_IRQ_NUM_RESERVED_FIRST,
 	GAUDI2_IRQ_NUM_RESERVED_LAST = (GAUDI2_MSIX_ENTRIES - GAUDI2_NUM_USER_INTERRUPTS - 1),
 	GAUDI2_IRQ_NUM_USER_FIRST,