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Subject[PATCH v5 02/10] vfio/fsl-mc: Scan DPRC objects on vfio-fsl-mc driver bind
Date
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>
---
drivers/vfio/fsl-mc/vfio_fsl_mc.c | 90 +++++++++++++++++++++++
drivers/vfio/fsl-mc/vfio_fsl_mc_private.h | 1 +
2 files changed, 91 insertions(+)

diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
index a7a483a1e90b..ba44d6d01cc9 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
@@ -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 +86,79 @@ 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_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 +185,15 @@ 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 +208,14 @@ 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;
diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
index e79cc116f6b8..37d61eaa58c8 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
@@ -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 */
--
2.17.1
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