linux-kernel - [PATCH 1/6] habanalabs: don't wait for ASIC CPU after reset

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Message-Id: <20200328085238.3428-1-oded.gabbay@gmail.com>
Date:   Sat, 28 Mar 2020 11:52:33 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     linux-kernel@...r.kernel.org, oshpigelman@...ana.ai,
        ttayar@...ana.ai
Cc:     gregkh@...uxfoundation.org
Subject: [PATCH 1/6] habanalabs: don't wait for ASIC CPU after reset

Upon reset of the ASIC, the driver would have waited for the CPU to come
out of reset before finishing the reset process. This was done for the
purpose of making the CPU available to answer FLR requests. However, when a
VM shuts down, the driver isn't removed so a reset never happens.
Therefore, remove this waiting period as we don't need it.

Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
---
 drivers/misc/habanalabs/goya/goya.c  | 24 ------------------------
 drivers/misc/habanalabs/goya/goyaP.h |  2 +-
 2 files changed, 1 insertion(+), 25 deletions(-)

diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
index 68f065607544..db125cf80850 100644
--- a/drivers/misc/habanalabs/goya/goya.c
+++ b/drivers/misc/habanalabs/goya/goya.c
@@ -2684,30 +2684,6 @@ static void goya_hw_fini(struct hl_device *hdev, bool hard_reset)
 					HW_CAP_MMU | HW_CAP_TPC_MBIST |
 					HW_CAP_GOLDEN | HW_CAP_TPC);
 	memset(goya->events_stat, 0, sizeof(goya->events_stat));
-
-	if (!hdev->pldm) {
-		int rc;
-		/* In case we are running inside VM and the VM is
-		 * shutting down, we need to make sure CPU boot-loader
-		 * is running before we can continue the VM shutdown.
-		 * That is because the VM will send an FLR signal that
-		 * we must answer
-		 */
-		dev_info(hdev->dev,
-			"Going to wait up to %ds for CPU boot loader\n",
-			GOYA_CPU_TIMEOUT_USEC / 1000 / 1000);
-
-		rc = hl_poll_timeout(
-			hdev,
-			mmPSOC_GLOBAL_CONF_WARM_REBOOT,
-			status,
-			(status == CPU_BOOT_STATUS_DRAM_RDY),
-			10000,
-			GOYA_CPU_TIMEOUT_USEC);
-		if (rc)
-			dev_err(hdev->dev,
-				"failed to wait for CPU boot loader\n");
-	}
 }
 
 int goya_suspend(struct hl_device *hdev)
diff --git a/drivers/misc/habanalabs/goya/goyaP.h b/drivers/misc/habanalabs/goya/goyaP.h
index c3230cb6e25c..1555d03e3cb2 100644
--- a/drivers/misc/habanalabs/goya/goyaP.h
+++ b/drivers/misc/habanalabs/goya/goyaP.h
@@ -45,7 +45,7 @@
 
 #define CORESIGHT_TIMEOUT_USEC		100000		/* 100 ms */
 
-#define GOYA_CPU_TIMEOUT_USEC		10000000	/* 10s */
+#define GOYA_CPU_TIMEOUT_USEC		15000000	/* 15s */
 
 #define TPC_ENABLED_MASK		0xFF
 
-- 
2.17.1