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Message-ID: <1411166981-3610-4-git-send-email-German.Rivera@freescale.com>
Date: Fri, 19 Sep 2014 17:49:41 -0500
From: "J. German Rivera" <German.Rivera@...escale.com>
To: <gregkh@...uxfoundation.org>, <arnd@...db.de>,
<linux-kernel@...r.kernel.org>
CC: <stuart.yoder@...escale.com>, <Kim.Phillips@...escale.com>,
<scottwood@...escale.com>, <agraf@...e.de>,
<linuxppc-release@...ux.freescale.net>,
"J. German Rivera" <German.Rivera@...escale.com>
Subject: [PATCH 3/3 v2] drivers/bus: Device driver for FSL-MC DPRC devices
From: "J. German Rivera" <German.Rivera@...escale.com>
A DPRC (Data Path Resource Container) is an isolation device
that contains a set of DPAA networking devices to be
assigned to an isolation domain (e.g., a virtual machine).
Signed-off-by: J. German Rivera <German.Rivera@...escale.com>
Signed-off-by: Stuart Yoder <stuart.yoder@...escale.com>
---
Changes in v2:
- Addressed comments from Kim Phillips:
* Fix warning in drivers/bus/fsl-mc/fsl_mc_dprc.c:173
* Fixed linker errors when MC bus driver built as module
drivers/bus/fsl-mc/Makefile | 11 +-
drivers/bus/fsl-mc/fsl_mc_bus.c | 10 +
drivers/bus/fsl-mc/fsl_mc_dprc.c | 402 ++++++++++++++++++++++++++++++++++++++
include/linux/fsl_mc_private.h | 10 +
4 files changed, 428 insertions(+), 5 deletions(-)
create mode 100644 drivers/bus/fsl-mc/fsl_mc_dprc.c
diff --git a/drivers/bus/fsl-mc/Makefile b/drivers/bus/fsl-mc/Makefile
index 2981d70..8ee3284 100644
--- a/drivers/bus/fsl-mc/Makefile
+++ b/drivers/bus/fsl-mc/Makefile
@@ -5,10 +5,11 @@
#
# This file is released under the GPLv2
#
-obj-$(CONFIG_FSL_MC_BUS) += fsl_mc_bus_driver.o
+obj-$(CONFIG_FSL_MC_BUS) += fsl_mc_bus_driver.o \
-fsl_mc_bus_driver-objs := fsl_mc_bus.o \
- fsl_mc_sys.o \
- dprc.o \
- dpmng.o
+fsl_mc_bus_driver-objs := fsl_mc_bus.o \
+ fsl_mc_sys.o \
+ dprc.o \
+ dpmng.o \
+ fsl_mc_dprc.o
diff --git a/drivers/bus/fsl-mc/fsl_mc_bus.c b/drivers/bus/fsl-mc/fsl_mc_bus.c
index e3a994f..afe16cd 100644
--- a/drivers/bus/fsl-mc/fsl_mc_bus.c
+++ b/drivers/bus/fsl-mc/fsl_mc_bus.c
@@ -539,6 +539,7 @@ static int __init fsl_mc_bus_driver_init(void)
{
int error = -EINVAL;
bool bus_registered = false;
+ bool platform_driver_registered = false;
mc_dev_cache = kmem_cache_create("fsl_mc_device",
sizeof(struct fsl_mc_device), 0, 0,
@@ -564,8 +565,16 @@ static int __init fsl_mc_bus_driver_init(void)
goto error;
}
+ platform_driver_registered = true;
+ error = dprc_driver_init();
+ if (error < 0)
+ goto error;
+
return 0;
error:
+ if (platform_driver_registered)
+ platform_driver_unregister(&fsl_mc_bus_driver);
+
if (bus_registered)
bus_unregister(&fsl_mc_bus_type);
@@ -582,6 +591,7 @@ static void __exit fsl_mc_bus_driver_exit(void)
if (WARN_ON(mc_dev_cache == NULL))
return;
+ dprc_driver_exit();
platform_driver_unregister(&fsl_mc_bus_driver);
bus_unregister(&fsl_mc_bus_type);
kmem_cache_destroy(mc_dev_cache);
diff --git a/drivers/bus/fsl-mc/fsl_mc_dprc.c b/drivers/bus/fsl-mc/fsl_mc_dprc.c
new file mode 100644
index 0000000..bf96de0
--- /dev/null
+++ b/drivers/bus/fsl-mc/fsl_mc_dprc.c
@@ -0,0 +1,402 @@
+/*
+ * Freescale daata path resource container (DPRC) driver
+ *
+ * Copyright (C) 2014 Freescale Semiconductor, Inc.
+ * Author: German Rivera <German.Rivera@...escale.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/fsl_mc_private.h>
+#include <linux/fsl_mc_sys.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include "fsl_dprc_cmd.h"
+
+struct dprc_child_objs {
+ int child_count;
+ struct dprc_obj_desc *child_array;
+};
+
+static int __fsl_mc_device_remove_if_not_in_mc(struct device *dev, void *data)
+{
+ int i;
+ struct dprc_child_objs *objs;
+ struct fsl_mc_device *mc_dev;
+
+ WARN_ON(dev == NULL);
+ WARN_ON(data == NULL);
+ mc_dev = to_fsl_mc_device(dev);
+ objs = data;
+
+ for (i = 0; i < objs->child_count; i++) {
+ struct dprc_obj_desc *obj_desc = &objs->child_array[i];
+
+ if (strlen(obj_desc->type) != 0 &&
+ FSL_MC_DEVICE_MATCH(mc_dev, obj_desc))
+ break;
+ }
+
+ if (i == objs->child_count)
+ fsl_mc_device_remove(mc_dev);
+
+ return 0;
+}
+
+static int __fsl_mc_device_remove(struct device *dev, void *data)
+{
+ WARN_ON(dev == NULL);
+ WARN_ON(data != NULL);
+ fsl_mc_device_remove(to_fsl_mc_device(dev));
+ return 0;
+}
+
+/**
+ * dprc_remove_devices - Removes devices for objects removed from a DPRC
+ *
+ * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object
+ * @obj_desc_array: array of object descriptors for child objects currently
+ * present in the DPRC in the MC.
+ * @num_child_objects_in_mc: number of entries in obj_desc_array
+ *
+ * Synchronizes the state of the Linux bus driver with the actual state of
+ * the MC by removing devices that represent MC objects that have
+ * been dynamically removed in the physical DPRC.
+ */
+static void dprc_remove_devices(struct fsl_mc_device *mc_bus_dev,
+ struct dprc_obj_desc *obj_desc_array,
+ int num_child_objects_in_mc)
+{
+ if (num_child_objects_in_mc != 0) {
+ /*
+ * Remove child objects that are in the DPRC in Linux,
+ * but not in the MC:
+ */
+ struct dprc_child_objs objs;
+
+ objs.child_count = num_child_objects_in_mc;
+ objs.child_array = obj_desc_array;
+ device_for_each_child(&mc_bus_dev->dev, &objs,
+ __fsl_mc_device_remove_if_not_in_mc);
+ } else {
+ /*
+ * There are no child objects for this DPRC in the MC.
+ * So, remove all the child devices from Linux:
+ */
+ device_for_each_child(&mc_bus_dev->dev, NULL,
+ __fsl_mc_device_remove);
+ }
+}
+
+static int __fsl_mc_device_match(struct device *dev, void *data)
+{
+ struct dprc_obj_desc *obj_desc = data;
+ struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
+
+ return FSL_MC_DEVICE_MATCH(mc_dev, obj_desc);
+}
+
+static struct fsl_mc_device *fsl_mc_device_lookup(struct dprc_obj_desc
+ *obj_desc,
+ struct fsl_mc_device
+ *mc_bus_dev)
+{
+ struct device *dev;
+
+ dev = device_find_child(&mc_bus_dev->dev, obj_desc,
+ __fsl_mc_device_match);
+
+ return (dev != NULL) ? to_fsl_mc_device(dev) : NULL;
+}
+
+/**
+ * dprc_add_new_devices - Adds devices to the logical bus for a DPRC
+ *
+ * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object
+ * @obj_desc_array: array of device descriptors for child devices currently
+ * present in the physical DPRC.
+ * @num_child_objects_in_mc: number of entries in obj_desc_array
+ *
+ * Synchronizes the state of the Linux bus driver with the actual
+ * state of the MC by adding objects that have been newly discovered
+ * in the physical DPRC.
+ */
+static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev,
+ struct dprc_obj_desc *obj_desc_array,
+ int num_child_objects_in_mc)
+{
+ int error;
+ int i;
+
+ for (i = 0; i < num_child_objects_in_mc; i++) {
+ struct dprc_region_desc region_desc;
+ struct fsl_mc_device *child_dev;
+ struct fsl_mc_io *mc_io = NULL;
+ struct dprc_obj_desc *obj_desc = &obj_desc_array[i];
+
+ if (strlen(obj_desc->type) == 0)
+ continue;
+ /*
+ * Check if device is already known to Linux:
+ */
+ child_dev = fsl_mc_device_lookup(obj_desc, mc_bus_dev);
+ if (child_dev != NULL)
+ continue;
+
+ if (strcmp(obj_desc->type, "dprc") == 0) {
+ /*
+ * Get the MC portal physical address for the device
+ * (specified in the device's first MMIO region):
+ */
+ if (WARN_ON(obj_desc->region_count == 0))
+ continue;
+
+ error = dprc_get_obj_region(mc_bus_dev->mc_io,
+ mc_bus_dev->mc_handle,
+ obj_desc->type,
+ obj_desc->id,
+ 0, ®ion_desc);
+ if (error < 0) {
+ dev_err(&mc_bus_dev->dev,
+ "dprc_get_obj_region() failed: %d\n",
+ error);
+ continue;
+ }
+
+ if (region_desc.size !=
+ mc_bus_dev->mc_io->portal_size) {
+ error = -EINVAL;
+ dev_err(&mc_bus_dev->dev,
+ "Invalid MC portal size: %u\n",
+ region_desc.size);
+ continue;
+ }
+
+ error = fsl_create_mc_io(&mc_bus_dev->dev,
+ region_desc.base_paddr,
+ region_desc.size, 0, &mc_io);
+ if (error < 0)
+ continue;
+ }
+
+ error = fsl_mc_device_add(obj_desc, mc_io, &mc_bus_dev->dev,
+ &child_dev);
+ if (error < 0) {
+ if (mc_io != NULL)
+ fsl_destroy_mc_io(mc_io);
+
+ continue;
+ }
+ }
+}
+
+/**
+ * dprc_scan_objects - Discover objects in a DPRC
+ *
+ * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object
+ *
+ * Detects objects added and removed from a DPRC and synchronizes the
+ * state of the Linux bus driver, MC by adding and removing
+ * devices accordingly.
+ */
+int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev)
+{
+ int num_child_objects;
+ int dprc_get_obj_failures;
+ int error = -EINVAL;
+ struct dprc_obj_desc *child_obj_desc_array = NULL;
+
+ error = dprc_get_obj_count(mc_bus_dev->mc_io,
+ mc_bus_dev->mc_handle,
+ &num_child_objects);
+ if (error < 0) {
+ dev_err(&mc_bus_dev->dev, "dprc_get_obj_count() failed: %d\n",
+ error);
+ goto out;
+ }
+
+ if (num_child_objects != 0) {
+ int i;
+
+ child_obj_desc_array =
+ devm_kmalloc_array(&mc_bus_dev->dev, num_child_objects,
+ sizeof(*child_obj_desc_array),
+ GFP_KERNEL);
+ if (child_obj_desc_array == NULL) {
+ error = -ENOMEM;
+ dev_err(&mc_bus_dev->dev,
+ "No memory to allocate obj_desc array\n");
+ goto out;
+ }
+
+ /*
+ * Discover objects currently present in the physical DPRC:
+ */
+ dprc_get_obj_failures = 0;
+ for (i = 0; i < num_child_objects; i++) {
+ struct dprc_obj_desc *obj_desc =
+ &child_obj_desc_array[i];
+
+ error = dprc_get_obj(mc_bus_dev->mc_io,
+ mc_bus_dev->mc_handle,
+ i, obj_desc);
+ if (error < 0) {
+ dev_err(&mc_bus_dev->dev,
+ "dprc_get_obj(i=%d) failed: %d\n",
+ i, error);
+ /*
+ * Mark the obj entry as "invalid", by using the
+ * empty string as obj type:
+ */
+ obj_desc->type[0] = '\0';
+ obj_desc->id = error;
+ dprc_get_obj_failures++;
+ continue;
+ }
+
+ dev_info(&mc_bus_dev->dev,
+ "Discovered object: type %s, id %d\n",
+ obj_desc->type, obj_desc->id);
+ }
+
+ if (dprc_get_obj_failures != 0) {
+ dev_err(&mc_bus_dev->dev,
+ "%d out of %d devices could not be retrieved\n",
+ dprc_get_obj_failures, num_child_objects);
+ }
+ }
+
+ dprc_remove_devices(mc_bus_dev, child_obj_desc_array,
+ num_child_objects);
+
+ dprc_add_new_devices(mc_bus_dev, child_obj_desc_array,
+ num_child_objects);
+
+ error = 0;
+out:
+ if (child_obj_desc_array != NULL)
+ devm_kfree(&mc_bus_dev->dev, child_obj_desc_array);
+
+ return error;
+}
+EXPORT_SYMBOL_GPL(dprc_scan_objects);
+
+/**
+ * dprc_scan_container - Scans a physical DPRC and synchronizes Linux bus state
+ *
+ * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object
+ *
+ * Scans the physical DPRC and synchronizes the state of the Linux
+ * bus driver with the actual state of the MC by adding and removing
+ * devices as appropriate.
+ */
+int dprc_scan_container(struct fsl_mc_device *mc_bus_dev)
+{
+ int error = -EINVAL;
+
+ error = dprc_scan_objects(mc_bus_dev);
+ if (error < 0)
+ goto error;
+
+ return 0;
+error:
+ return error;
+}
+EXPORT_SYMBOL_GPL(dprc_scan_container);
+
+/**
+ * dprc_probe - callback invoked when a DPRC is being bound to this driver
+ *
+ * @mc_dev: Pointer to fsl-mc device representing a DPRC
+ *
+ * It opens the physical DPRC in the MC.
+ * It scans the DPRC to discover the MC objects contained in it.
+ */
+static int dprc_probe(struct fsl_mc_device *mc_dev)
+{
+ int error = -EINVAL;
+ bool dprc_opened = false;
+
+ if (WARN_ON(strcmp(mc_dev->obj_desc.type, "dprc") != 0))
+ goto error;
+
+ error = dprc_open(mc_dev->mc_io, mc_dev->obj_desc.id,
+ &mc_dev->mc_handle);
+ if (error < 0) {
+ dev_err(&mc_dev->dev, "dprc_open() failed: %d\n", error);
+ goto error;
+ }
+
+ dprc_opened = true;
+ error = dprc_scan_container(mc_dev);
+ if (error < 0)
+ goto error;
+
+ dev_info(&mc_dev->dev, "DPRC device bound to driver");
+ return 0;
+error:
+ if (dprc_opened)
+ (void)dprc_close(mc_dev->mc_io, mc_dev->mc_handle);
+
+ return error;
+}
+
+/**
+ * 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.
+ */
+static int dprc_remove(struct fsl_mc_device *mc_dev)
+{
+ int error = -EINVAL;
+
+ if (WARN_ON(strcmp(mc_dev->obj_desc.type, "dprc") != 0))
+ goto error;
+ if (WARN_ON(mc_dev->mc_io == NULL))
+ goto error;
+
+ device_for_each_child(&mc_dev->dev, NULL, __fsl_mc_device_remove);
+ error = dprc_close(mc_dev->mc_io, mc_dev->mc_handle);
+ if (error < 0)
+ dev_err(&mc_dev->dev, "dprc_close() failed: %d\n", error);
+
+ dev_info(&mc_dev->dev, "DPRC device unbound from driver");
+ return 0;
+error:
+ return error;
+}
+
+static const struct fsl_mc_device_match_id match_id_table[] = {
+ {
+ .vendor = FSL_MC_VENDOR_FREESCALE,
+ .obj_type = "dprc",
+ .ver_major = DPRC_VER_MAJOR,
+ .ver_minor = DPRC_VER_MINOR},
+ {.vendor = 0x0},
+};
+
+static struct fsl_mc_driver dprc_driver = {
+ .driver = {
+ .name = FSL_MC_DPRC_DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .pm = NULL,
+ },
+ .match_id_table = match_id_table,
+ .probe = dprc_probe,
+ .remove = dprc_remove,
+};
+
+int __init dprc_driver_init(void)
+{
+ return fsl_mc_driver_register(&dprc_driver);
+}
+
+void __exit dprc_driver_exit(void)
+{
+ fsl_mc_driver_unregister(&dprc_driver);
+}
diff --git a/include/linux/fsl_mc_private.h b/include/linux/fsl_mc_private.h
index 3ff3f2b..52721f7 100644
--- a/include/linux/fsl_mc_private.h
+++ b/include/linux/fsl_mc_private.h
@@ -15,6 +15,8 @@
#include <linux/mutex.h>
#include <linux/stringify.h>
+#define FSL_MC_DPRC_DRIVER_NAME "fsl_mc_dprc"
+
#define FSL_MC_DEVICE_MATCH(_mc_dev, _obj_desc) \
(strcmp((_mc_dev)->obj_desc.type, (_obj_desc)->type) == 0 && \
(_mc_dev)->obj_desc.id == (_obj_desc)->id)
@@ -30,4 +32,12 @@ int __must_check fsl_mc_device_add(struct dprc_obj_desc *obj_desc,
void fsl_mc_device_remove(struct fsl_mc_device *mc_dev);
+int __must_check dprc_scan_container(struct fsl_mc_device *mc_bus_dev);
+
+int __must_check dprc_scan_objects(struct fsl_mc_device *mc_bus_dev);
+
+int __init dprc_driver_init(void);
+
+void __exit dprc_driver_exit(void);
+
#endif /* _FSL_MC_PRIVATE_H_ */
--
1.7.9.7
--
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