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bbfb54e7b3
This patch supports the DFL drivers be written in userspace. This is realized by exposing the userspace I/O device interfaces. The driver now only binds the ether group feature, which has no irq. So the irq support is not implemented yet. Reviewed-by: Tom Rix <trix@redhat.com> Signed-off-by: Xu Yilun <yilun.xu@intel.com> Link: https://lore.kernel.org/r/1615168776-8553-2-git-send-email-yilun.xu@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Generic DFL driver for Userspace I/O devicess
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*
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* Copyright (C) 2021 Intel Corporation, Inc.
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*/
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#include <linux/dfl.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/uio_driver.h>
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#define DRIVER_NAME "uio_dfl"
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static int uio_dfl_probe(struct dfl_device *ddev)
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{
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struct resource *r = &ddev->mmio_res;
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struct device *dev = &ddev->dev;
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struct uio_info *uioinfo;
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struct uio_mem *uiomem;
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int ret;
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uioinfo = devm_kzalloc(dev, sizeof(struct uio_info), GFP_KERNEL);
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if (!uioinfo)
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return -ENOMEM;
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uioinfo->name = DRIVER_NAME;
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uioinfo->version = "0";
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uiomem = &uioinfo->mem[0];
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uiomem->memtype = UIO_MEM_PHYS;
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uiomem->addr = r->start & PAGE_MASK;
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uiomem->offs = r->start & ~PAGE_MASK;
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uiomem->size = (uiomem->offs + resource_size(r)
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+ PAGE_SIZE - 1) & PAGE_MASK;
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uiomem->name = r->name;
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/* Irq is yet to be supported */
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uioinfo->irq = UIO_IRQ_NONE;
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ret = devm_uio_register_device(dev, uioinfo);
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if (ret)
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dev_err(dev, "unable to register uio device\n");
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return ret;
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}
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#define FME_FEATURE_ID_ETH_GROUP 0x10
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static const struct dfl_device_id uio_dfl_ids[] = {
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{ FME_ID, FME_FEATURE_ID_ETH_GROUP },
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{ }
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};
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MODULE_DEVICE_TABLE(dfl, uio_dfl_ids);
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static struct dfl_driver uio_dfl_driver = {
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.drv = {
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.name = DRIVER_NAME,
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},
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.id_table = uio_dfl_ids,
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.probe = uio_dfl_probe,
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};
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module_dfl_driver(uio_dfl_driver);
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MODULE_DESCRIPTION("Generic DFL driver for Userspace I/O devices");
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MODULE_AUTHOR("Intel Corporation");
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MODULE_LICENSE("GPL v2");
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