habanalabs: improve MMU cache invalidation code

A new sequence is introduced to invalidate the MMU cache in order to avoid
timeouts.

Signed-off-by: Omer Shpigelman <oshpigelman@habana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
index 4cb1f71..0933847 100644 (file)
--- a/drivers/misc/habanalabs/gaudi/gaudi.c
+++ b/drivers/misc/habanalabs/gaudi/gaudi.c
@@ -5982,16 +5982,18 @@ static void gaudi_mmu_invalidate_cache(struct hl_device *hdev, bool is_hard,
                timeout_usec = MMU_CONFIG_TIMEOUT_USEC;
 
        /* L0 & L1 invalidation */
-       WREG32(mmSTLB_INV_ALL_START, 1);
+       WREG32(mmSTLB_INV_PS, 2);
 
        rc = hl_poll_timeout(
                hdev,
-               mmSTLB_INV_ALL_START,
+               mmSTLB_INV_PS,
                status,
                !status,
                1000,
                timeout_usec);
 
+       WREG32(mmSTLB_INV_SET, 0);
+
        if (rc)
                dev_notice_ratelimited(hdev->dev,
                        "Timeout when waiting for MMU cache invalidation\n");