On Mon, Jan 25, 2021 at 11:00:38AM -0800, Tom Rix wrote: > > On 1/25/21 12:49 AM, Xu Yilun wrote: > > 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. > > > > Signed-off-by: Xu Yilun <yilun.xu@xxxxxxxxx> > > --- > > v9: switch to add a uio driver in drivers/uio > > --- > > drivers/uio/Kconfig | 13 ++++++++++ > > drivers/uio/Makefile | 1 + > > drivers/uio/uio_dfl.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++ > > You should add this to the MAINTAINERS file. This is covered by MAINTAINERS under drivers/uio. > > > 3 files changed, 80 insertions(+) > > create mode 100644 drivers/uio/uio_dfl.c > > > > diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig > > index 202ee81..44778f8 100644 > > --- a/drivers/uio/Kconfig > > +++ b/drivers/uio/Kconfig > > @@ -165,4 +165,17 @@ config UIO_HV_GENERIC > > to network and storage devices from userspace. > > > > If you compile this as a module, it will be called uio_hv_generic. > > + > > +config UIO_DFL > > + tristate "Generic driver for DFL bus" > > The term 'DFL' will be unknown to folks in drivers/uio > > I think it would be better if DFL was always prefixed 'FPGA DFL' > > > + depends on FPGA_DFL > > + help > > + Generic DFL (Device Feature List) driver for Userspace I/O devices. > > + It is useful to provide direct access to DFL devices from userspace. > > + A sample userspace application using this driver is available for > > + download in a git repository: > > + > > + git clone https://github.com/OPAE/opae-sdk.git > > + > > + If you compile this as a module, it will be called uio_dfl. I'm not sure KConfig is the right place for this. > > opae-sdk is pretty large and uncovered in the Documentation/fpga/dfl.rst. > > Where in opae-sdk is this example ? > > If you can point me at the example, I will turn it into a selftest. > > Tom > > > endif > > diff --git a/drivers/uio/Makefile b/drivers/uio/Makefile > > index c285dd2..f2f416a1 100644 > > --- a/drivers/uio/Makefile > > +++ b/drivers/uio/Makefile > > @@ -11,3 +11,4 @@ obj-$(CONFIG_UIO_PRUSS) += uio_pruss.o > > obj-$(CONFIG_UIO_MF624) += uio_mf624.o > > obj-$(CONFIG_UIO_FSL_ELBC_GPCM) += uio_fsl_elbc_gpcm.o > > obj-$(CONFIG_UIO_HV_GENERIC) += uio_hv_generic.o > > +obj-$(CONFIG_UIO_DFL) += uio_dfl.o > > diff --git a/drivers/uio/uio_dfl.c b/drivers/uio/uio_dfl.c > > new file mode 100644 > > index 0000000..89c0fc7 > > --- /dev/null > > +++ b/drivers/uio/uio_dfl.c > > @@ -0,0 +1,66 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * Generic DFL driver for Userspace I/O devicess > > + * > > + * Copyright (C) 2021 Intel Corporation, Inc. > > + */ > > +#include <linux/dfl.h> > > +#include <linux/errno.h> > > +#include <linux/module.h> > > +#include <linux/uio_driver.h> > > + > > +#define DRIVER_NAME "uio_dfl" > > + > > +static int uio_dfl_probe(struct dfl_device *ddev) > > +{ > > + struct resource *r = &ddev->mmio_res; > > + struct device *dev = &ddev->dev; > > + struct uio_info *uioinfo; > > + struct uio_mem *uiomem; > > + int ret; > > + > > + uioinfo = devm_kzalloc(dev, sizeof(struct uio_info), GFP_KERNEL); > > + if (!uioinfo) > > + return -ENOMEM; > > + > > + uioinfo->name = DRIVER_NAME; > > + uioinfo->version = "0"; > > + > > + uiomem = &uioinfo->mem[0]; > > + uiomem->memtype = UIO_MEM_PHYS; > > + uiomem->addr = r->start & PAGE_MASK; > > + uiomem->offs = r->start & ~PAGE_MASK; > > + uiomem->size = (uiomem->offs + resource_size(r) > > + + PAGE_SIZE - 1) & PAGE_MASK; > > + uiomem->name = r->name; > > + > > + /* Irq is yet to be supported */ > > + uioinfo->irq = UIO_IRQ_NONE; > > + > > + ret = devm_uio_register_device(dev, uioinfo); > > + if (ret) > > + dev_err(dev, "unable to register uio device\n"); > > + > > + return ret; > > +} > > + > > +#define FME_FEATURE_ID_ETH_GROUP 0x10 > > + > > +static const struct dfl_device_id uio_dfl_ids[] = { > > + { FME_ID, FME_FEATURE_ID_ETH_GROUP }, > > + { } > > +}; > > +MODULE_DEVICE_TABLE(dfl, uio_dfl_ids); > > + > > +static struct dfl_driver uio_dfl_driver = { > > + .drv = { > > + .name = DRIVER_NAME, > > + }, > > + .id_table = uio_dfl_ids, > > + .probe = uio_dfl_probe, > > +}; > > +module_dfl_driver(uio_dfl_driver); > > + > > +MODULE_DESCRIPTION("Generic DFL driver for Userspace I/O devices"); > > +MODULE_AUTHOR("Intel Corporation"); > > +MODULE_LICENSE("GPL v2"); >
