linux-kernel - [PATCH 3/4] habanalabs: read preboot status bits in an earlier stage

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Date:   Fri, 21 May 2021 20:06:52 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Koby Elbaz <kelbaz@...ana.ai>
Subject: [PATCH 3/4] habanalabs: read preboot status bits in an earlier stage

From: Koby Elbaz <kelbaz@...ana.ai>

On newer releases, host won't be able to trigger an interrupt directly
to the ASIC GIC controller.
To be able to decide whether GIC can/not be used, we must read device's
preboot status bits in a stage that precedes the possible first use of
GIC (when device is in dirty state).

Signed-off-by: Koby Elbaz <kelbaz@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/firmware_if.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/misc/habanalabs/common/firmware_if.c b/drivers/misc/habanalabs/common/firmware_if.c
index 17173020ff53..cdec7212f377 100644
--- a/drivers/misc/habanalabs/common/firmware_if.c
+++ b/drivers/misc/habanalabs/common/firmware_if.c
@@ -1159,8 +1159,6 @@ static int hl_fw_static_read_preboot_status(struct hl_device *hdev)
 	if (rc)
 		return rc;
 
-	hl_fw_preboot_update_state(hdev);
-
 	return 0;
 }
 
@@ -1189,6 +1187,8 @@ int hl_fw_read_preboot_status(struct hl_device *hdev, u32 cpu_boot_status_reg,
 	if (rc)
 		return rc;
 
+	hl_fw_preboot_update_state(hdev);
+
 	/* no need to read preboot status in dynamic load */
 	if (hdev->asic_prop.dynamic_fw_load)
 		return 0;
@@ -1864,9 +1864,6 @@ static int hl_fw_dynamic_load_image(struct hl_device *hdev,
 		hl_fw_boot_fit_update_state(hdev,
 				le32_to_cpu(dyn_regs->cpu_boot_dev_sts0),
 				le32_to_cpu(dyn_regs->cpu_boot_dev_sts1));
-	} else {
-		/* update state during preboot handshake */
-		hl_fw_preboot_update_state(hdev);
 	}
 
 	/* copy boot fit to space allocated by FW */
@@ -2097,9 +2094,6 @@ static int hl_fw_dynamic_init_cpu(struct hl_device *hdev,
 	}
 
 	if (!(hdev->fw_components & FW_TYPE_BOOT_CPU)) {
-		/* update the preboot state */
-		hl_fw_preboot_update_state(hdev);
-
 		rc = hl_fw_dynamic_request_descriptor(hdev, fw_loader, 0);
 		if (rc)
 			goto protocol_err;
-- 
2.25.1