linux-kernel - [PATCH v2 1/3] dmaengine: idxd: Add descriptor definitions for 16 bytes of pattern in memory fill operation

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Date:   Fri,  3 Mar 2023 13:34:11 -0800
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     "Vinod Koul" <vkoul@...nel.org>,
        "Dave Jiang" <dave.jiang@...el.com>
Cc:     dmaengine@...r.kernel.org,
        "linux-kernel" <linux-kernel@...r.kernel.org>,
        Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH v2 1/3] dmaengine: idxd: Add descriptor definitions for 16 bytes of pattern in memory fill operation

The memory fill operation (0x04) can fill in memory with either 8 bytes
or 16 bytes of pattern. To fill in memory with 16 bytes of pattern, the
first 8 bytes are provided in pattern lower in bytes 16-23 and the next
8 bytes are in pattern upper in bytes 40-47 in the descriptor. Currently
only 8 bytes of pattern is enabled.

Add descriptor definitions for pattern lower and pattern upper so that
user can use 16 bytes of pattern to fill memory.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
---
v2:
- Change anonymous struct to uint64_t for pattern_upper (Dave Jiang)

 include/uapi/linux/idxd.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/uapi/linux/idxd.h b/include/uapi/linux/idxd.h
index 1d553bedbdb5..c43d7df5fc15 100644
--- a/include/uapi/linux/idxd.h
+++ b/include/uapi/linux/idxd.h
@@ -180,6 +180,7 @@ struct dsa_hw_desc {
 		uint64_t	rdback_addr;
 		uint64_t	pattern;
 		uint64_t	desc_list_addr;
+		uint64_t	pattern_lower;
 	};
 	union {
 		uint64_t	dst_addr;
@@ -244,6 +245,9 @@ struct dsa_hw_desc {
 			uint16_t	dest_app_tag_seed;
 		};
 
+		/* Fill */
+		uint64_t	pattern_upper;
+
 		uint8_t		op_specific[24];
 	};
 } __attribute__((packed));
-- 
2.37.1