From 763a0b4d81f60beb835dc3e8991aa9e1ed9f71b1 Mon Sep 17 00:00:00 2001
From: Ofir Bitton <obitton@habana.ai>
Date: Fri, 4 Sep 2020 21:33:53 +0300
Subject: habanalabs: Fix alignment issue in cpucp_info structure
Because the device CPU compiler aligns structures to 8 bytes,
struct cpucp_info has an alignment issue as some parts
in the structure are not aligned to 8 bytes.
It is preferred that we explicitly insert placeholders inside
the structure to avoid confusion
in order to validate this scenario, we printed both pointers:
__u8 cpucp_version[VERSION_MAX_LEN]; (0xffff899c67ed4cbc)
__le64 dram_size; (0xffff899c67ed4d40)
we see difference of 132 bytes although the first array
is only 128 bytes long, Meaning compiler added a 4 byte padding.
Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
---
drivers/misc/habanalabs/include/common/cpucp_if.h | 1 +
1 file changed, 1 insertion(+)
(limited to 'drivers/misc')
diff --git a/drivers/misc/habanalabs/include/common/cpucp_if.h b/drivers/misc/habanalabs/include/common/cpucp_if.h
index 1e8480e978e2..dcde440427b4 100644
--- a/drivers/misc/habanalabs/include/common/cpucp_if.h
+++ b/drivers/misc/habanalabs/include/common/cpucp_if.h
@@ -410,6 +410,7 @@ struct cpucp_info {
__u8 fuse_version[VERSION_MAX_LEN];
__u8 thermal_version[VERSION_MAX_LEN];
__u8 cpucp_version[VERSION_MAX_LEN];
+ __le32 reserved2;
__le64 dram_size;
char card_name[CARD_NAME_MAX_LEN];
};
--
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