linux-kernel - [PATCH 08/16] habanalabs/gaudi: restore user registers when context opens

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Message-Id: <20210818133922.63637-8-ogabbay@kernel.org>
Date:   Wed, 18 Aug 2021 16:39:14 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Subject: [PATCH 08/16] habanalabs/gaudi: restore user registers when context opens

Because we don't have multiple contexts in GAUDI, and to minimize
calls to is_idle function (which uses many register reads), move
the call to clear the user registers to the opening of the single
user context.

Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/gaudi/gaudi.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
index 3fbcdb013a7e..e9a8ed96fe65 100644
--- a/drivers/misc/habanalabs/gaudi/gaudi.c
+++ b/drivers/misc/habanalabs/gaudi/gaudi.c
@@ -6088,7 +6088,7 @@ static int gaudi_restore_user_registers(struct hl_device *hdev)
 
 static int gaudi_context_switch(struct hl_device *hdev, u32 asid)
 {
-	return gaudi_restore_user_registers(hdev);
+	return 0;
 }
 
 static int gaudi_mmu_clear_pgt_range(struct hl_device *hdev)
@@ -8658,10 +8658,20 @@ static void gaudi_internal_cb_pool_fini(struct hl_device *hdev,
 
 static int gaudi_ctx_init(struct hl_ctx *ctx)
 {
+	int rc;
+
 	if (ctx->asid == HL_KERNEL_ASID_ID)
 		return 0;
 
-	return gaudi_internal_cb_pool_init(ctx->hdev, ctx);
+	rc = gaudi_internal_cb_pool_init(ctx->hdev, ctx);
+	if (rc)
+		return rc;
+
+	rc = gaudi_restore_user_registers(ctx->hdev);
+	if (rc)
+		gaudi_internal_cb_pool_fini(ctx->hdev, ctx);
+
+	return rc;
 }
 
 static void gaudi_ctx_fini(struct hl_ctx *ctx)
-- 
2.17.1