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cc6711b0bf
Expose an 'override_only' helper macro (i.e.
PCI_DRIVER_OVERRIDE_DEVICE_VFIO) for VFIO PCI sub system and add the
required code to prefix its matching entries with "vfio_" in
modules.alias file.
It allows VFIO device drivers to include match entries in the
modules.alias file produced by kbuild that are not used for normal
driver autoprobing and module autoloading. Drivers using these match
entries can be connected to the PCI device manually, by userspace, using
the existing driver_override sysfs.
For example the resulting modules.alias may have:
alias pci:v000015B3d00001021sv*sd*bc*sc*i* mlx5_core
alias vfio_pci:v000015B3d00001021sv*sd*bc*sc*i* mlx5_vfio_pci
alias vfio_pci:v*d*sv*sd*bc*sc*i* vfio_pci
In this example mlx5_core and mlx5_vfio_pci match to the same PCI
device. The kernel will autoload and autobind to mlx5_core but the
kernel and udev mechanisms will ignore mlx5_vfio_pci.
When userspace wants to change a device to the VFIO subsystem it can
implement a generic algorithm:
1) Identify the sysfs path to the device:
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0
2) Get the modalias string from the kernel:
$ cat /sys/bus/pci/devices/0000:01:00.0/modalias
pci:v000015B3d00001021sv000015B3sd00000001bc02sc00i00
3) Prefix it with vfio_:
vfio_pci:v000015B3d00001021sv000015B3sd00000001bc02sc00i00
4) Search modules.alias for the above string and select the entry that
has the fewest *'s:
alias vfio_pci:v000015B3d00001021sv*sd*bc*sc*i* mlx5_vfio_pci
5) modprobe the matched module name:
$ modprobe mlx5_vfio_pci
6) cat the matched module name to driver_override:
echo mlx5_vfio_pci > /sys/bus/pci/devices/0000:01:00.0/driver_override
7) unbind device from original module
echo 0000:01:00.0 > /sys/bus/pci/devices/0000:01:00.0/driver/unbind
8) probe PCI drivers (or explicitly bind to mlx5_vfio_pci)
echo 0000:01:00.0 > /sys/bus/pci/drivers_probe
The algorithm is independent of bus type. In future the other buses with
VFIO device drivers, like platform and ACPI, can use this algorithm as
well.
This patch is the infrastructure to provide the information in the
modules.alias to userspace. Convert the only VFIO pci_driver which results
in one new line in the modules.alias:
alias vfio_pci:v*d*sv*sd*bc*sc*i* vfio_pci
Later series introduce additional HW specific VFIO PCI drivers, such as
mlx5_vfio_pci.
Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com> # for pci.h
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Link: https://lore.kernel.org/r/20210826103912.128972-11-yishaih@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
264 lines
7.3 KiB
C
264 lines
7.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kbuild.h>
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#include <linux/mod_devicetable.h>
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#define DEVID(devid) DEFINE(SIZE_##devid, sizeof(struct devid))
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#define DEVID_FIELD(devid, field) \
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DEFINE(OFF_##devid##_##field, offsetof(struct devid, field))
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int main(void)
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{
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DEVID(usb_device_id);
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DEVID_FIELD(usb_device_id, match_flags);
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DEVID_FIELD(usb_device_id, idVendor);
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DEVID_FIELD(usb_device_id, idProduct);
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DEVID_FIELD(usb_device_id, bcdDevice_lo);
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DEVID_FIELD(usb_device_id, bcdDevice_hi);
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DEVID_FIELD(usb_device_id, bDeviceClass);
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DEVID_FIELD(usb_device_id, bDeviceSubClass);
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DEVID_FIELD(usb_device_id, bDeviceProtocol);
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DEVID_FIELD(usb_device_id, bInterfaceClass);
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DEVID_FIELD(usb_device_id, bInterfaceSubClass);
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DEVID_FIELD(usb_device_id, bInterfaceProtocol);
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DEVID_FIELD(usb_device_id, bInterfaceNumber);
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DEVID(hid_device_id);
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DEVID_FIELD(hid_device_id, bus);
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DEVID_FIELD(hid_device_id, group);
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DEVID_FIELD(hid_device_id, vendor);
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DEVID_FIELD(hid_device_id, product);
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DEVID(ieee1394_device_id);
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DEVID_FIELD(ieee1394_device_id, match_flags);
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DEVID_FIELD(ieee1394_device_id, vendor_id);
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DEVID_FIELD(ieee1394_device_id, model_id);
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DEVID_FIELD(ieee1394_device_id, specifier_id);
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DEVID_FIELD(ieee1394_device_id, version);
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DEVID(pci_device_id);
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DEVID_FIELD(pci_device_id, vendor);
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DEVID_FIELD(pci_device_id, device);
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DEVID_FIELD(pci_device_id, subvendor);
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DEVID_FIELD(pci_device_id, subdevice);
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DEVID_FIELD(pci_device_id, class);
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DEVID_FIELD(pci_device_id, class_mask);
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DEVID_FIELD(pci_device_id, override_only);
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DEVID(ccw_device_id);
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DEVID_FIELD(ccw_device_id, match_flags);
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DEVID_FIELD(ccw_device_id, cu_type);
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DEVID_FIELD(ccw_device_id, cu_model);
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DEVID_FIELD(ccw_device_id, dev_type);
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DEVID_FIELD(ccw_device_id, dev_model);
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DEVID(ap_device_id);
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DEVID_FIELD(ap_device_id, dev_type);
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DEVID(css_device_id);
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DEVID_FIELD(css_device_id, type);
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DEVID(serio_device_id);
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DEVID_FIELD(serio_device_id, type);
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DEVID_FIELD(serio_device_id, proto);
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DEVID_FIELD(serio_device_id, id);
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DEVID_FIELD(serio_device_id, extra);
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DEVID(acpi_device_id);
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DEVID_FIELD(acpi_device_id, id);
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DEVID_FIELD(acpi_device_id, cls);
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DEVID_FIELD(acpi_device_id, cls_msk);
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DEVID(pnp_device_id);
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DEVID_FIELD(pnp_device_id, id);
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DEVID(pnp_card_device_id);
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DEVID_FIELD(pnp_card_device_id, devs);
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DEVID(pcmcia_device_id);
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DEVID_FIELD(pcmcia_device_id, match_flags);
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DEVID_FIELD(pcmcia_device_id, manf_id);
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DEVID_FIELD(pcmcia_device_id, card_id);
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DEVID_FIELD(pcmcia_device_id, func_id);
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DEVID_FIELD(pcmcia_device_id, function);
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DEVID_FIELD(pcmcia_device_id, device_no);
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DEVID_FIELD(pcmcia_device_id, prod_id_hash);
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DEVID(of_device_id);
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DEVID_FIELD(of_device_id, name);
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DEVID_FIELD(of_device_id, type);
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DEVID_FIELD(of_device_id, compatible);
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DEVID(vio_device_id);
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DEVID_FIELD(vio_device_id, type);
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DEVID_FIELD(vio_device_id, compat);
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DEVID(input_device_id);
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DEVID_FIELD(input_device_id, flags);
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DEVID_FIELD(input_device_id, bustype);
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DEVID_FIELD(input_device_id, vendor);
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DEVID_FIELD(input_device_id, product);
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DEVID_FIELD(input_device_id, version);
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DEVID_FIELD(input_device_id, evbit);
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DEVID_FIELD(input_device_id, keybit);
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DEVID_FIELD(input_device_id, relbit);
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DEVID_FIELD(input_device_id, absbit);
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DEVID_FIELD(input_device_id, mscbit);
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DEVID_FIELD(input_device_id, ledbit);
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DEVID_FIELD(input_device_id, sndbit);
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DEVID_FIELD(input_device_id, ffbit);
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DEVID_FIELD(input_device_id, swbit);
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DEVID(eisa_device_id);
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DEVID_FIELD(eisa_device_id, sig);
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DEVID(parisc_device_id);
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DEVID_FIELD(parisc_device_id, hw_type);
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DEVID_FIELD(parisc_device_id, hversion);
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DEVID_FIELD(parisc_device_id, hversion_rev);
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DEVID_FIELD(parisc_device_id, sversion);
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DEVID(sdio_device_id);
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DEVID_FIELD(sdio_device_id, class);
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DEVID_FIELD(sdio_device_id, vendor);
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DEVID_FIELD(sdio_device_id, device);
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DEVID(ssb_device_id);
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DEVID_FIELD(ssb_device_id, vendor);
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DEVID_FIELD(ssb_device_id, coreid);
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DEVID_FIELD(ssb_device_id, revision);
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DEVID(bcma_device_id);
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DEVID_FIELD(bcma_device_id, manuf);
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DEVID_FIELD(bcma_device_id, id);
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DEVID_FIELD(bcma_device_id, rev);
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DEVID_FIELD(bcma_device_id, class);
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DEVID(virtio_device_id);
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DEVID_FIELD(virtio_device_id, device);
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DEVID_FIELD(virtio_device_id, vendor);
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DEVID(hv_vmbus_device_id);
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DEVID_FIELD(hv_vmbus_device_id, guid);
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DEVID(rpmsg_device_id);
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DEVID_FIELD(rpmsg_device_id, name);
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DEVID(i2c_device_id);
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DEVID_FIELD(i2c_device_id, name);
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DEVID(i3c_device_id);
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DEVID_FIELD(i3c_device_id, match_flags);
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DEVID_FIELD(i3c_device_id, dcr);
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DEVID_FIELD(i3c_device_id, manuf_id);
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DEVID_FIELD(i3c_device_id, part_id);
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DEVID_FIELD(i3c_device_id, extra_info);
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DEVID(spi_device_id);
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DEVID_FIELD(spi_device_id, name);
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DEVID(dmi_system_id);
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DEVID_FIELD(dmi_system_id, matches);
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DEVID(platform_device_id);
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DEVID_FIELD(platform_device_id, name);
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DEVID(mdio_device_id);
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DEVID_FIELD(mdio_device_id, phy_id);
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DEVID_FIELD(mdio_device_id, phy_id_mask);
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DEVID(zorro_device_id);
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DEVID_FIELD(zorro_device_id, id);
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DEVID(isapnp_device_id);
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DEVID_FIELD(isapnp_device_id, vendor);
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DEVID_FIELD(isapnp_device_id, function);
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DEVID(ipack_device_id);
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DEVID_FIELD(ipack_device_id, format);
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DEVID_FIELD(ipack_device_id, vendor);
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DEVID_FIELD(ipack_device_id, device);
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DEVID(amba_id);
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DEVID_FIELD(amba_id, id);
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DEVID_FIELD(amba_id, mask);
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DEVID(mips_cdmm_device_id);
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DEVID_FIELD(mips_cdmm_device_id, type);
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DEVID(x86_cpu_id);
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DEVID_FIELD(x86_cpu_id, feature);
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DEVID_FIELD(x86_cpu_id, family);
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DEVID_FIELD(x86_cpu_id, model);
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DEVID_FIELD(x86_cpu_id, vendor);
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DEVID(cpu_feature);
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DEVID_FIELD(cpu_feature, feature);
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DEVID(mei_cl_device_id);
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DEVID_FIELD(mei_cl_device_id, name);
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DEVID_FIELD(mei_cl_device_id, uuid);
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DEVID_FIELD(mei_cl_device_id, version);
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DEVID(rio_device_id);
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DEVID_FIELD(rio_device_id, did);
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DEVID_FIELD(rio_device_id, vid);
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DEVID_FIELD(rio_device_id, asm_did);
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DEVID_FIELD(rio_device_id, asm_vid);
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DEVID(ulpi_device_id);
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DEVID_FIELD(ulpi_device_id, vendor);
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DEVID_FIELD(ulpi_device_id, product);
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DEVID(hda_device_id);
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DEVID_FIELD(hda_device_id, vendor_id);
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DEVID_FIELD(hda_device_id, rev_id);
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DEVID_FIELD(hda_device_id, api_version);
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DEVID(sdw_device_id);
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DEVID_FIELD(sdw_device_id, mfg_id);
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DEVID_FIELD(sdw_device_id, part_id);
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DEVID_FIELD(sdw_device_id, sdw_version);
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DEVID_FIELD(sdw_device_id, class_id);
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DEVID(fsl_mc_device_id);
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DEVID_FIELD(fsl_mc_device_id, vendor);
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DEVID_FIELD(fsl_mc_device_id, obj_type);
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DEVID(tb_service_id);
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DEVID_FIELD(tb_service_id, match_flags);
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DEVID_FIELD(tb_service_id, protocol_key);
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DEVID_FIELD(tb_service_id, protocol_id);
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DEVID_FIELD(tb_service_id, protocol_version);
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DEVID_FIELD(tb_service_id, protocol_revision);
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DEVID(typec_device_id);
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DEVID_FIELD(typec_device_id, svid);
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DEVID_FIELD(typec_device_id, mode);
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DEVID(tee_client_device_id);
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DEVID_FIELD(tee_client_device_id, uuid);
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DEVID(wmi_device_id);
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DEVID_FIELD(wmi_device_id, guid_string);
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DEVID(mhi_device_id);
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DEVID_FIELD(mhi_device_id, chan);
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DEVID(auxiliary_device_id);
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DEVID_FIELD(auxiliary_device_id, name);
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DEVID(ssam_device_id);
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DEVID_FIELD(ssam_device_id, match_flags);
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DEVID_FIELD(ssam_device_id, domain);
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DEVID_FIELD(ssam_device_id, category);
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DEVID_FIELD(ssam_device_id, target);
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DEVID_FIELD(ssam_device_id, instance);
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DEVID_FIELD(ssam_device_id, function);
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DEVID(dfl_device_id);
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DEVID_FIELD(dfl_device_id, type);
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DEVID_FIELD(dfl_device_id, feature_id);
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return 0;
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}
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