linux-kernel - Re: [PATCH V2 1/4] drivers/fpga/amd: Add new driver amd versal-pci

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Message-ID: <Z5X/QeJ49s5Y3SuH@yilunxu-OptiPlex-7050>
Date: Sun, 26 Jan 2025 17:24:17 +0800
From: Xu Yilun <yilun.xu@...ux.intel.com>
To: Yidong Zhang <yidong.zhang@....com>
Cc: linux-kernel@...r.kernel.org, linux-fpga@...r.kernel.org,
	mdf@...nel.org, hao.wu@...el.com, yilun.xu@...el.com,
	lizhi.hou@....com, DMG Karthik <Karthik.DMG@....com>,
	Nishad Saraf <nishads@....com>,
	Prapul Krishnamurthy <prapulk@....com>,
	Hayden Laccabue <hayden.laccabue@....com>
Subject: Re: [PATCH V2 1/4] drivers/fpga/amd: Add new driver amd versal-pci

> +static int versal_pci_program_axlf(struct versal_pci_device *vdev, char *data, size_t size)
> +{
> +	const struct axlf *axlf = (struct axlf *)data;
> +	struct fpga_image_info *image_info;
> +	int ret;
> +
> +	image_info = fpga_image_info_alloc(&vdev->pdev->dev);
> +	if (!image_info)
> +		return -ENOMEM;
> +
> +	image_info->count = axlf->header.length;
> +	image_info->buf = (char *)axlf;
> +
> +	ret = fpga_mgr_load(vdev->fdev->mgr, image_info);

I see, but this is not working like this. fpga_mgr_load() is intended to be
called by fpga_region, any reprogramming API should come from fpga_region,
and fpga_region could provide uAPI for userspace reprogramming.

If your driver act both as a fpga_mgr backend and a fpga_mgr kAPI user,
then you don't have to bother using fpga framework at all.

Thanks,
Yilun

> +	if (ret) {
> +		vdev_err(vdev, "failed to load xclbin: %d", ret);
> +		goto exit;
> +	}
> +
> +	vdev_info(vdev, "Downloaded axlf %pUb of size %zu Bytes", &axlf->header.uuid, size);
> +	uuid_copy(&vdev->xclbin_uuid, &axlf->header.uuid);
> +
> +exit:
> +	fpga_image_info_free(image_info);
> +
> +	return ret;
> +}