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Fix SR-IOV passthrough devices to allow ppt to attach

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A late change to the SR-IOV infrastructure broke passthrough of
VFs.  device_set_devclass() was being used to try to force the
ppt driver to attach to the device, but this didn't work because
the DF_FIXEDCLASS flag wasn't being set on the device, so the
ppt driver probe routine would not match when it returned
BUS_NOWILDCARD.  Fix this by adding a new device function that
both sets the devclass and sets the DF_FIXEDCLASS flag, and use
that to force the ppt driver to attach to VFs.

Differential Revision: https://reviews.freebsd.org/D2041
Reviewed by:	jhb
MFC after:	3 weeks
This commit is contained in:
Ryan Stone 2015-03-10 23:27:13 +00:00
parent 3cb3567d7e
commit 1c229658b9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=279868
3 changed files with 21 additions and 1 deletions
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2
sys/dev/pci/pci_iov.c
View File

@ -586,7 +586,7 @@ pci_iov_enumerate_vfs(struct pci_devinfo *dinfo, const nvlist_t *config,
* VFs.
*/
if (nvlist_get_bool(iov_config, "passthrough"))
device_set_devclass(vf, "ppt");
device_set_devclass_fixed(vf, "ppt");
vfinfo = device_get_ivars(vf);

19
sys/kern/subr_bus.c
View File

@ -2682,6 +2682,25 @@ device_set_devclass(device_t dev, const char *classname)
return (error);
}
/**
* @brief Set the devclass of a device and mark the devclass fixed.
* @see device_set_devclass()
*/
int
device_set_devclass_fixed(device_t dev, const char *classname)
{
int error;
if (classname == NULL)
return (EINVAL);
error = device_set_devclass(dev, classname);
if (error)
return (error);
dev->flags |= DF_FIXEDCLASS;
return (0);
}
/**
* @brief Set the driver of a device
*

1
sys/sys/bus.h
View File

@ -522,6 +522,7 @@ void device_quiet(device_t dev);
void device_set_desc(device_t dev, const char* desc);
void device_set_desc_copy(device_t dev, const char* desc);
int device_set_devclass(device_t dev, const char *classname);
int device_set_devclass_fixed(device_t dev, const char *classname);
int device_set_driver(device_t dev, driver_t *driver);
void device_set_flags(device_t dev, u_int32_t flags);
void device_set_softc(device_t dev, void *softc);