From a7f7457593a00644c10a7fa00db1cd1c32a1bcb2 Mon Sep 17 00:00:00 2001 From: Damjan Marion Date: Tue, 23 May 2017 18:32:21 +0200 Subject: vlib: use driver_override in sysfs for binding pci devs to vfio/uio drivers Change-Id: I262e455792fd95d286ee3ebc0049e2352ae5899f Signed-off-by: Damjan Marion --- src/vlib/pci/linux_pci.c | 42 ++++++++++++++++++++++++++++++------------ 1 file changed, 30 insertions(+), 12 deletions(-) (limited to 'src/vlib/pci') diff --git a/src/vlib/pci/linux_pci.c b/src/vlib/pci/linux_pci.c index d43361aa48c..623737d5355 100644 --- a/src/vlib/pci/linux_pci.c +++ b/src/vlib/pci/linux_pci.c @@ -95,24 +95,22 @@ clib_error_t * vlib_pci_bind_to_uio (vlib_pci_device_t * d, char *uio_driver_name) { clib_error_t *error = 0; - u8 *s = 0; + u8 *s = 0, *driver_name = 0; DIR *dir = 0; struct dirent *e; - int fd; + int fd, clear_driver_override = 0; u8 *dev_dir_name = format (0, "/sys/bus/pci/devices/%U", format_vlib_pci_addr, &d->bus_address); - /* if uio sub-directory exists, we are fine, device is - already bound to UIO driver */ - s = format (s, "%v/uio%c", dev_dir_name, 0); - if (access ((char *) s, F_OK) == 0) - goto done; + s = format (s, "%v/driver%c", dev_dir_name, 0); + driver_name = vlib_sysfs_link_to_name ((char *) s); vec_reset_length (s); - s = format (s, "%v/iommu_group%c", dev_dir_name, 0); - if (access ((char *) s, F_OK) == 0) + if (driver_name && + ((strcmp ("vfio-pci", (char *) driver_name) == 0) || + (strcmp ("uio_pci_generic", (char *) driver_name) == 0) || + (strcmp ("igb_uio", (char *) driver_name) == 0))) goto done; - vec_reset_length (s); /* walk trough all linux interfaces and if interface belonging to this device is founf check if interface is admin up */ @@ -187,17 +185,37 @@ vlib_pci_bind_to_uio (vlib_pci_device_t * d, char *uio_driver_name) vlib_sysfs_write ((char *) s, "%U", format_vlib_pci_addr, &d->bus_address); vec_reset_length (s); - s = format (s, "/sys/bus/pci/drivers/%s/new_id%c", uio_driver_name, 0); - vlib_sysfs_write ((char *) s, "0x%04x 0x%04x", d->vendor_id, d->device_id); + s = format (s, "%v/driver_override%c", dev_dir_name, 0); + if (access ((char *) s, F_OK) == 0) + { + vlib_sysfs_write ((char *) s, "%s", uio_driver_name); + clear_driver_override = 1; + } + else + { + vec_reset_length (s); + s = format (s, "/sys/bus/pci/drivers/%s/new_id%c", uio_driver_name, 0); + vlib_sysfs_write ((char *) s, "0x%04x 0x%04x", d->vendor_id, + d->device_id); + } vec_reset_length (s); s = format (s, "/sys/bus/pci/drivers/%s/bind%c", uio_driver_name, 0); vlib_sysfs_write ((char *) s, "%U", format_vlib_pci_addr, &d->bus_address); + vec_reset_length (s); + + if (clear_driver_override) + { + s = format (s, "%v/driver_override%c", dev_dir_name, 0); + vlib_sysfs_write ((char *) s, "%c", 0); + vec_reset_length (s); + } done: closedir (dir); vec_free (s); vec_free (dev_dir_name); + vec_free (driver_name); return error; } -- cgit 1.2.3-korg