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vfio/fsl-mc: Scan DPRC objects on vfio-fsl-mc driver bind

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The DPRC (Data Path Resource Container) device is a bus device and has
child devices attached to it. When the vfio-fsl-mc driver is probed
the DPRC is scanned and the child devices discovered and initialized.

Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
Signed-off-by: Diana Craciun <diana.craciun@oss.nxp.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Diana Craciun 2020-10-05 20:36:46 +03:00 committed by Alex Williamson
parent fb1ff4c194
commit 704f5082d8
2 changed files with 92 additions and 0 deletions
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91
drivers/vfio/fsl-mc/vfio_fsl_mc.c
View File

@ -15,6 +15,8 @@
#include "vfio_fsl_mc_private.h"
static struct fsl_mc_driver vfio_fsl_mc_driver;
static int vfio_fsl_mc_open(void *device_data)
{
if (!try_module_get(THIS_MODULE))
@ -84,6 +86,80 @@ static const struct vfio_device_ops vfio_fsl_mc_ops = {
.mmap = vfio_fsl_mc_mmap,
};
static int vfio_fsl_mc_bus_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct vfio_fsl_mc_device *vdev = container_of(nb,
struct vfio_fsl_mc_device, nb);
struct device *dev = data;
struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
struct fsl_mc_device *mc_cont = to_fsl_mc_device(mc_dev->dev.parent);
if (action == BUS_NOTIFY_ADD_DEVICE &&
vdev->mc_dev == mc_cont) {
mc_dev->driver_override = kasprintf(GFP_KERNEL, "%s",
vfio_fsl_mc_ops.name);
if (!mc_dev->driver_override)
dev_warn(dev, "VFIO_FSL_MC: Setting driver override for device in dprc %s failed\n",
dev_name(&mc_cont->dev));
else
dev_info(dev, "VFIO_FSL_MC: Setting driver override for device in dprc %s\n",
dev_name(&mc_cont->dev));
} else if (action == BUS_NOTIFY_BOUND_DRIVER &&
vdev->mc_dev == mc_cont) {
struct fsl_mc_driver *mc_drv = to_fsl_mc_driver(dev->driver);
if (mc_drv && mc_drv != &vfio_fsl_mc_driver)
dev_warn(dev, "VFIO_FSL_MC: Object %s bound to driver %s while DPRC bound to vfio-fsl-mc\n",
dev_name(dev), mc_drv->driver.name);
}
return 0;
}
static int vfio_fsl_mc_init_device(struct vfio_fsl_mc_device *vdev)
{
struct fsl_mc_device *mc_dev = vdev->mc_dev;
int ret;
/* Non-dprc devices share mc_io from parent */
if (!is_fsl_mc_bus_dprc(mc_dev)) {
struct fsl_mc_device *mc_cont = to_fsl_mc_device(mc_dev->dev.parent);
mc_dev->mc_io = mc_cont->mc_io;
return 0;
}
vdev->nb.notifier_call = vfio_fsl_mc_bus_notifier;
ret = bus_register_notifier(&fsl_mc_bus_type, &vdev->nb);
if (ret)
return ret;
/* open DPRC, allocate a MC portal */
ret = dprc_setup(mc_dev);
if (ret) {
dev_err(&mc_dev->dev, "VFIO_FSL_MC: Failed to setup DPRC (%d)\n", ret);
goto out_nc_unreg;
}
ret = dprc_scan_container(mc_dev, false);
if (ret) {
dev_err(&mc_dev->dev, "VFIO_FSL_MC: Container scanning failed (%d)\n", ret);
goto out_dprc_cleanup;
}
return 0;
out_dprc_cleanup:
dprc_remove_devices(mc_dev, NULL, 0);
dprc_cleanup(mc_dev);
out_nc_unreg:
bus_unregister_notifier(&fsl_mc_bus_type, &vdev->nb);
vdev->nb.notifier_call = NULL;
return ret;
}
static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev)
{
struct iommu_group *group;
@ -110,8 +186,15 @@ static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev)
dev_err(dev, "VFIO_FSL_MC: Failed to add to vfio group\n");
goto out_group_put;
}
ret = vfio_fsl_mc_init_device(vdev);
if (ret)
goto out_group_dev;
return 0;
out_group_dev:
vfio_del_group_dev(dev);
out_group_put:
vfio_iommu_group_put(group, dev);
return ret;
@ -126,6 +209,14 @@ static int vfio_fsl_mc_remove(struct fsl_mc_device *mc_dev)
if (!vdev)
return -EINVAL;
if (is_fsl_mc_bus_dprc(mc_dev)) {
dprc_remove_devices(mc_dev, NULL, 0);
dprc_cleanup(mc_dev);
}
if (vdev->nb.notifier_call)
bus_unregister_notifier(&fsl_mc_bus_type, &vdev->nb);
vfio_iommu_group_put(mc_dev->dev.iommu_group, dev);
return 0;

1
drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
View File

@ -9,6 +9,7 @@
struct vfio_fsl_mc_device {
struct fsl_mc_device *mc_dev;
struct notifier_block nb;
};
#endif /* VFIO_FSL_MC_PRIVATE_H */