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Subject[PATCH v5 08/13] bus/fsl-mc: Export a cleanup function for DPRC
Date
Create and export a cleanup function for DPRC. The function
is used by the DPRC driver, but it will be used by the VFIO
driver as well.

Signed-off-by: Diana Craciun <diana.craciun@oss.nxp.com>
---
drivers/bus/fsl-mc/dprc-driver.c | 62 ++++++++++++++++++++++++--------
include/linux/fsl/mc.h | 2 ++
2 files changed, 49 insertions(+), 15 deletions(-)

diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
index dde8fe965e30..516119c8121a 100644
--- a/drivers/bus/fsl-mc/dprc-driver.c
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -728,33 +728,26 @@ static void dprc_teardown_irq(struct fsl_mc_device *mc_dev)
}

/**
- * dprc_remove - callback invoked when a DPRC is being unbound from this driver
+ * dprc_cleanup - function that cleanups a DPRC
*
* @mc_dev: Pointer to fsl-mc device representing the DPRC
*
- * It removes the DPRC's child objects from Linux (not from the MC) and
- * closes the DPRC device in the MC.
- * It tears down the interrupts that were configured for the DPRC device.
+ * It closes the DPRC device in the MC.
* It destroys the interrupt pool associated with this MC bus.
*/
-static int dprc_remove(struct fsl_mc_device *mc_dev)
+
+int dprc_cleanup(struct fsl_mc_device *mc_dev)
{
int error;
struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);

- if (!is_fsl_mc_bus_dprc(mc_dev))
- return -EINVAL;
- if (!mc_dev->mc_io)
- return -EINVAL;

- if (!mc_bus->irq_resources)
+ /* this function should be called only for DPRCs, it
+ * is an error to call it for regular objects
+ */
+ if (!is_fsl_mc_bus_dprc(mc_dev))
return -EINVAL;

- if (dev_get_msi_domain(&mc_dev->dev))
- dprc_teardown_irq(mc_dev);
-
- device_for_each_child(&mc_dev->dev, NULL, __fsl_mc_device_remove);
-
if (dev_get_msi_domain(&mc_dev->dev)) {
fsl_mc_cleanup_irq_pool(mc_bus);
dev_set_msi_domain(&mc_dev->dev, NULL);
@@ -762,6 +755,14 @@ static int dprc_remove(struct fsl_mc_device *mc_dev)

fsl_mc_cleanup_all_resource_pools(mc_dev);

+ /* if this step fails we cannot go further with cleanup as there is no way of
+ * communicating with the firmware
+ */
+ if (!mc_dev->mc_io) {
+ dev_err(&mc_dev->dev, "mc_io is NULL, tear down cannot be performed in firmware\n");
+ return -EINVAL;
+ }
+
error = dprc_close(mc_dev->mc_io, 0, mc_dev->mc_handle);
if (error < 0)
dev_err(&mc_dev->dev, "dprc_close() failed: %d\n", error);
@@ -771,6 +772,37 @@ static int dprc_remove(struct fsl_mc_device *mc_dev)
mc_dev->mc_io = NULL;
}

+ return 0;
+}
+EXPORT_SYMBOL_GPL(dprc_cleanup);
+
+/**
+ * dprc_remove - callback invoked when a DPRC is being unbound from this driver
+ *
+ * @mc_dev: Pointer to fsl-mc device representing the DPRC
+ *
+ * It removes the DPRC's child objects from Linux (not from the MC) and
+ * closes the DPRC device in the MC.
+ * It tears down the interrupts that were configured for the DPRC device.
+ * It destroys the interrupt pool associated with this MC bus.
+ */
+static int dprc_remove(struct fsl_mc_device *mc_dev)
+{
+ struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
+
+ if (!is_fsl_mc_bus_dprc(mc_dev))
+ return -EINVAL;
+
+ if (!mc_bus->irq_resources)
+ return -EINVAL;
+
+ if (dev_get_msi_domain(&mc_dev->dev))
+ dprc_teardown_irq(mc_dev);
+
+ device_for_each_child(&mc_dev->dev, NULL, __fsl_mc_device_remove);
+
+ dprc_cleanup(mc_dev);
+
dev_info(&mc_dev->dev, "DPRC device unbound from driver");
return 0;
}
diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h
index da11171bc38f..5519a510b8c9 100644
--- a/include/linux/fsl/mc.h
+++ b/include/linux/fsl/mc.h
@@ -538,6 +538,8 @@ void dprc_remove_devices(struct fsl_mc_device *mc_bus_dev,
struct fsl_mc_obj_desc *obj_desc_array,
int num_child_objects_in_mc);

+int dprc_cleanup(struct fsl_mc_device *mc_dev);
+
/*
* Data Path Buffer Pool (DPBP) API
* Contains initialization APIs and runtime control APIs for DPBP
--
2.17.1
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