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| author |  Dave Jiang <dave.jiang@intel.com>
| 2021-07-15 11:44:47 -0700 |
|---|---|---|
| committer |  Vinod Koul <vkoul@kernel.org>
| 2021-07-21 10:09:16 +0530 |
| commit | 6e7f3ee97bbe2c7d7a53b7dbd7a08a579e03c8c9 (patch) | |
| tree | c9e9476cf28d5b54ee9ab97a7dbd1e2a40fd1fbf /drivers/dma/idxd/device.c | |
| parent | dmaengine: dsa: move dsa_bus_type out of idxd driver to standalone (diff) | |
| download | linux-6e7f3ee97bbe2c7d7a53b7dbd7a08a579e03c8c9.tar.gz linux-6e7f3ee97bbe2c7d7a53b7dbd7a08a579e03c8c9.tar.bz2 linux-6e7f3ee97bbe2c7d7a53b7dbd7a08a579e03c8c9.zip | |
dmaengine: idxd: move dsa_drv support to compatible mode
The original architecture of /sys/bus/dsa invented a scheme whereby
a single entry in the list of bus drivers, /sys/bus/drivers/dsa,
handled all device types and internally routed them to different
different drivers. Those internal drivers were invisible to
userspace.
With the idxd driver transitioned to a proper bus device-driver model,
the legacy behavior needs to be preserved due to it being exposed to
user space via sysfs. Create a compat driver to provide the legacy
behavior for /sys/bus/dsa/drivers/dsa. This should satisfy user
tool accel-config v3.2 or ealier where this behavior is expected.
If the distro has a newer accel-config then the legacy mode does
not need to be enabled.
When the compat driver binds the device (i.e. dsa0) to the dsa driver,
it will be bound to the new idxd_drv. The wq device (i.e. wq0.0) will
be bound to either the dmaengine_drv or the user_drv. The dsa_drv
becomes a routing mechansim for the new drivers. It will not support
additional external drivers that are implemented later.
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/162637468705.744545.4399080971745974435.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/idxd/device.c')
| -rw-r--r-- | drivers/dma/idxd/device.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c index 9bbc28d9a9eb..99350ac9a292 100644 --- a/drivers/dma/idxd/device.c +++ b/drivers/dma/idxd/device.c @@ -1318,3 +1318,4 @@ struct idxd_device_driver idxd_drv = { .remove = idxd_device_drv_remove, .name = "idxd", }; +EXPORT_SYMBOL_GPL(idxd_drv); |