linux-kernel - [PATCH 1/9] accel/habanalbs/gaudi2: reduce interrupt count to 128

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Date: Wed, 19 Jun 2024 09:34:17 +0300
From: Ofir Bitton <obitton@...ana.ai>
To: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/9] accel/habanalbs/gaudi2: reduce interrupt count to 128

Some systems allow a maximum number of 128 MSI-X interrupts.
Hence we reduce the interrupt count to 128 instead of 512.

Signed-off-by: Ofir Bitton <obitton@...ana.ai>
Reviewed-by: Ofir Bitton <obitton@...ana.ai>
---
 drivers/accel/habanalabs/gaudi2/gaudi2P.h        | 8 ++++----
 drivers/accel/habanalabs/include/gaudi2/gaudi2.h | 4 ++--
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/accel/habanalabs/gaudi2/gaudi2P.h b/drivers/accel/habanalabs/gaudi2/gaudi2P.h
index eee41387b269..05117272cac7 100644
--- a/drivers/accel/habanalabs/gaudi2/gaudi2P.h
+++ b/drivers/accel/habanalabs/gaudi2/gaudi2P.h
@@ -384,7 +384,7 @@ enum gaudi2_edma_id {
 /* User interrupt count is aligned with HW CQ count.
  * We have 64 CQ's per dcore, CQ0 in dcore 0 is reserved for legacy mode
  */
-#define GAUDI2_NUM_USER_INTERRUPTS 255
+#define GAUDI2_NUM_USER_INTERRUPTS 64
 #define GAUDI2_NUM_RESERVED_INTERRUPTS 1
 #define GAUDI2_TOTAL_USER_INTERRUPTS (GAUDI2_NUM_USER_INTERRUPTS + GAUDI2_NUM_RESERVED_INTERRUPTS)
 
@@ -416,11 +416,11 @@ enum gaudi2_irq_num {
 	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_EQ_ERROR,
+	GAUDI2_IRQ_NUM_USER_FIRST,
+	GAUDI2_IRQ_NUM_USER_LAST = (GAUDI2_IRQ_NUM_USER_FIRST + GAUDI2_NUM_USER_INTERRUPTS - 1),
 	GAUDI2_IRQ_NUM_RESERVED_FIRST,
-	GAUDI2_IRQ_NUM_RESERVED_LAST = (GAUDI2_MSIX_ENTRIES - GAUDI2_TOTAL_USER_INTERRUPTS - 1),
+	GAUDI2_IRQ_NUM_RESERVED_LAST = (GAUDI2_MSIX_ENTRIES - GAUDI2_NUM_RESERVED_INTERRUPTS - 1),
 	GAUDI2_IRQ_NUM_UNEXPECTED_ERROR = RESERVED_MSIX_UNEXPECTED_USER_ERROR_INTERRUPT,
-	GAUDI2_IRQ_NUM_USER_FIRST = GAUDI2_IRQ_NUM_UNEXPECTED_ERROR + 1,
-	GAUDI2_IRQ_NUM_USER_LAST = (GAUDI2_IRQ_NUM_USER_FIRST + GAUDI2_NUM_USER_INTERRUPTS - 1),
 	GAUDI2_IRQ_NUM_LAST = (GAUDI2_MSIX_ENTRIES - 1)
 };
 
diff --git a/drivers/accel/habanalabs/include/gaudi2/gaudi2.h b/drivers/accel/habanalabs/include/gaudi2/gaudi2.h
index 0231d6c55b4a..753d46a2836b 100644
--- a/drivers/accel/habanalabs/include/gaudi2/gaudi2.h
+++ b/drivers/accel/habanalabs/include/gaudi2/gaudi2.h
@@ -63,9 +63,9 @@
 #define RESERVED_VA_RANGE_FOR_ARC_ON_HOST_HPAGE_START	0xFFF0F80000000000ull
 #define RESERVED_VA_RANGE_FOR_ARC_ON_HOST_HPAGE_END	0xFFF0FFFFFFFFFFFFull
 
-#define RESERVED_MSIX_UNEXPECTED_USER_ERROR_INTERRUPT	256
+#define RESERVED_MSIX_UNEXPECTED_USER_ERROR_INTERRUPT	127
 
-#define GAUDI2_MSIX_ENTRIES	512
+#define GAUDI2_MSIX_ENTRIES	128
 
 #define QMAN_PQ_ENTRY_SIZE	16			/* Bytes */
 
-- 
2.34.1