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Message-ID: <b7527fc3-8750-69b8-40fa-214962ef50ed@intel.com>
Date: Tue, 8 Nov 2022 08:13:57 -0800
From: Dave Jiang <dave.jiang@...el.com>
To: Fenghua Yu <fenghua.yu@...el.com>, Vinod Koul <vkoul@...nel.org>
Cc: dmaengine@...r.kernel.org,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] dmaengine: idxd: Add descriptor definitions for 16
bytes of pattern in memory fill operation
On 11/7/2022 4:39 PM, Fenghua Yu wrote:
> 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>
> ---
> include/uapi/linux/idxd.h | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/include/uapi/linux/idxd.h b/include/uapi/linux/idxd.h
> index 095299c75828..04a2f6411820 100644
> --- a/include/uapi/linux/idxd.h
> +++ b/include/uapi/linux/idxd.h
> @@ -179,6 +179,7 @@ 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;
> @@ -243,6 +244,11 @@ struct dsa_hw_desc {
> uint16_t dest_app_tag_seed;
> };
>
> + /* Fill */
> + struct {
I don't think the anon struct is needed here. If there are others, that
can be added later with the next patch that needs it.
> + uint64_t pattern_upper;
> + };
> +
> uint8_t op_specific[24];
> };
> } __attribute__((packed));
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