From: "J. German Rivera" <german.riv...@freescale.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.riv...@freescale.com>
---
drivers/bus/fsl-mc/Makefile | 3 +-
drivers/bus/fsl-mc/fsl_mc_dprc.c | 422 ++++++++++++++++++++++++++++++++++++++
include/linux/fsl_mc_private.h | 4 +-
3 files changed, 427 insertions(+), 2 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 f5f9033..4991999 100644
--- a/drivers/bus/fsl-mc/Makefile
+++ b/drivers/bus/fsl-mc/Makefile
@@ -5,7 +5,8 @@
#
# 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_dprc.o
fsl_mc_bus_driver-objs := fsl_mc_bus.o \
mc_sys.o \
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..648d41f
--- /dev/null
+++ b/drivers/bus/fsl-mc/fsl_mc_dprc.c
@@ -0,0 +1,422 @@
+/*
+ * Freescale daata path resource container (DPRC) driver
+ *
+ * Copyright (C) 2014 Freescale Semiconductor, Inc.
+ * Author: German Rivera <german.riv...@freescale.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"
+
+/**
+ * dprc_remove_all_devices - Does a bus remove for all objects of a DPRC
+ *
+ * @container: pointer to the DPRC object
+ *
+ * Removes all devices on the bus that represents the DPRC object.
+ */
+static void dprc_remove_all_devices(struct fsl_mc_dprc *container)
+{
+ struct fsl_mc_device *mc_dev;
+ struct fsl_mc_device *next;
+
+ list_for_each_entry_safe(mc_dev, next, &container->child_list,
+ dev_node) {
+ WARN_ON(mc_dev->container != container);
+ fsl_mc_device_remove(mc_dev);
+ }
+}
+
+/**
+ * dprc_remove_devices - Removes devices for objects removed from a DPRC
+ *
+ * @container: pointer to the DPRC container 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 objects that have been dynamically
+ * removed in the physical DPRC.
+ */
+static void dprc_remove_devices(struct fsl_mc_dprc *container,
+ 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:
+ */
+ int i;
+ struct fsl_mc_device *child_obj;
+ struct fsl_mc_device *next;
+
+ list_for_each_entry_safe(child_obj, next,
+ &container->child_list, dev_node) {
+ for (i = 0; i < num_child_objects_in_mc; i++) {
+ if (strlen(obj_desc_array[i].type) != 0 &&
+ FSL_MC_DEVICE_MATCH(child_obj,
+ &obj_desc_array[i]))
+ break;
+ }
+
+ if (i == num_child_objects_in_mc)
+ fsl_mc_device_remove(child_obj);
+ }
+ } else {
+ /*
+ * There are no child objects for this DPRC in the MC.
+ * So, remove all the child objects from Linux:
+ */
+ dprc_remove_all_devices(container);
+ }
+}
+
+/**
+ * dprc_add_new_devices - Adds devices to the bus that represents a DPRC
+ *
+ * @container: pointer to the DPRC container object
+ * @obj_desc_array: array of device descriptors for child device currently
+ * present in the DPRC container 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 adding objects that have been newly discovered
+ * in the physical DPRC.
+ */
+static void dprc_add_new_devices(struct fsl_mc_dprc *container,
+ struct dprc_obj_desc *obj_desc_array,
+ int num_child_objects_in_mc)
+{
+ int error;
+ int i;
+ struct fsl_mc_device *mc_dev = container->mc_dev;
+ struct device *dev = &mc_dev->dev;
+
+ for (i = 0; i < num_child_objects_in_mc; i++) {
+ struct dprc_region_desc region_desc;
+ struct fsl_mc_device *child_obj;
+ 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_obj = fsl_mc_device_lookup(obj_desc, container);
+ if (child_obj != 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_dev->mc_io,
+ mc_dev->mc_handle,
+ obj_desc->type,
+ obj_desc->id,
+ 0, ®ion_desc);
+ if (error < 0) {
+ FSL_MC_ERROR(dev,
+ "dprc_get_obj_region() failed:
%d\n",
+ error);
+ continue;
+ }
+
+ if (region_desc.size != mc_dev->mc_io->portal_size) {
+ error = -EINVAL;
+ FSL_MC_ERROR(dev,
+ "Invalid MC portal size: %lu\n",
+ region_desc.size);
+ continue;
+ }
+
+ error = fsl_create_mc_io(region_desc.base_paddr,
+ region_desc.size, 0, &mc_io);
+ if (error < 0)
+ continue;
+ }
+
+ error = fsl_mc_device_add(obj_desc,
+ mc_io, dev, container, &child_obj);
+ if (error < 0) {
+ if (mc_io != NULL)
+ fsl_destroy_mc_io(mc_io);
+
+ continue;
+ }
+ }
+}
+
+/**
+ * dprc_scan_objects - Discover objects in a DPRC
+ *
+ * @container: pointer to the DPRC container to be scanned.
+ *
+ * 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_dprc *container)
+{
+ int num_child_objects;
+ int dprc_get_obj_failures;
+ int error = -EINVAL;
+ struct dprc_obj_desc *child_obj_desc_array = NULL;
+ struct device *dev;
+ struct fsl_mc_device *container_dev;
+
+ if (WARN_ON(container->magic != FSL_MC_DPRC_MAGIC))
+ goto out;
+ container_dev = container->mc_dev;
+ if (WARN_ON(container_dev->magic != FSL_MC_DEVICE_MAGIC))
+ goto out;
+
+ dev = &container_dev->dev;
+ error = dprc_get_obj_count(container_dev->mc_io,
+ container_dev->mc_handle,
+ &num_child_objects);
+ if (error < 0) {
+ FSL_MC_ERROR(dev, "dprc_get_obj_count() failed: %d\n", error);
+ goto out;
+ }
+
+ if (num_child_objects != 0) {
+ int i;
+
+ child_obj_desc_array =
+ kmalloc_array(num_child_objects,
+ sizeof(*child_obj_desc_array), GFP_KERNEL);
+ if (child_obj_desc_array == NULL) {
+ error = -ENOMEM;
+ FSL_MC_ERROR(dev,
+ "No memory to allocate obj_desc array\n");
+ goto out;
+ }
+
+ /*
+ * Discover objects currently in the DPRC container in the MC:
+ */
+ 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(container_dev->mc_io,
+ container_dev->mc_handle,
+ i, obj_desc);
+ if (error < 0) {
+ FSL_MC_ERROR(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(dev, "Discovered object: type %s, id %d\n",
+ obj_desc->type, obj_desc->id);
+ }
+
+ if (dprc_get_obj_failures != 0) {
+ FSL_MC_ERROR(dev,
+ "%d out of %d devices could not be
retrieved\n",
+ dprc_get_obj_failures, num_child_objects);
+ }
+ }
+
+ dprc_remove_devices(container, child_obj_desc_array, num_child_objects);
+
+ dprc_add_new_devices(container, child_obj_desc_array,
+ num_child_objects);
+
+ error = 0;
+out:
+ if (child_obj_desc_array != NULL)
+ kfree(child_obj_desc_array);
+
+ return error;
+}
+EXPORT_SYMBOL_GPL(dprc_scan_objects);
+
+/**
+ * dprc_scan_container - Scans the DPRC and synchronizes Linux bus state
+ *
+ * @container: pointer to the DPRC to be scanned.
+ *
+ * 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_dprc *container)
+{
+ int error = -EINVAL;
+
+ if (WARN_ON(container->magic != FSL_MC_DPRC_MAGIC))
+ goto error;
+ if (WARN_ON(container->mc_dev->magic != FSL_MC_DEVICE_MAGIC))
+ goto error;
+
+ error = dprc_scan_objects(container);
+ 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 an DPRC object
+ *
+ * It creates the corresponding fsl_mc_dprc object and opens the DPRC object
+ * in the MC.
+ * It scans the DPRC to discover MC portals and MC objects contained in it.
+ */
+static int dprc_probe(struct fsl_mc_device *mc_dev)
+{
+ int irq_count;
+ struct fsl_mc_io *mc_io;
+ struct fsl_mc_dprc *container = NULL;
+ int error = -EINVAL;
+ bool dprc_opened = false;
+
+ if (WARN_ON(mc_dev->magic != FSL_MC_DEVICE_MAGIC))
+ goto error;
+ if (WARN_ON(strcmp(mc_dev->obj_desc.type, "dprc") != 0))
+ goto error;
+
+ mc_io = mc_dev->mc_io;
+ if (WARN_ON(mc_io->magic != FSL_MC_IO_MAGIC))
+ goto error;
+
+ irq_count = mc_dev->obj_desc.irq_count;
+ if (WARN_ON(irq_count == 0))
+ goto error;
+
+ container = devm_kzalloc(&mc_dev->dev, sizeof(*container), GFP_KERNEL);
+ if (container == NULL) {
+ error = -ENOMEM;
+ FSL_MC_ERROR(&mc_dev->dev,
+ "Failed to allocate memory for dprc device\n");
+ goto error;
+ }
+
+ mc_dev->mc_dev_data = container;
+ container->magic = FSL_MC_DPRC_MAGIC;
+ container->mc_dev = mc_dev;
+ INIT_LIST_HEAD(&container->child_list);
+ mutex_init(&container->mutex);
+
+ error = dprc_open(mc_io, mc_dev->obj_desc.id, &mc_dev->mc_handle);
+ if (error < 0) {
+ FSL_MC_ERROR(&mc_dev->dev, "dprc_open() failed: %d\n", error);
+ goto error;
+ }
+
+ dprc_opened = true;
+ error = dprc_scan_container(container);
+ if (error < 0)
+ goto error;
+
+ dev_info(&mc_dev->dev, "DPRC device bound to driver");
+ return 0;
+error:
+ if (container != NULL) {
+ if (dprc_opened)
+ (void)dprc_close(mc_io, mc_dev->mc_handle);
+
+ container->magic = 0x0;
+ devm_kfree(&mc_dev->dev, container);
+ }
+
+ return error;
+}
+
+/**
+ * dprc_remove - callback invoked when a DPRC is being unbound from this driver
+ *
+ * @mc_dev: Pointer to fsl-mc device representing an DPRC object
+ *
+ * It removes the DPRC's child objects from Linux (not from the MC) and
+ * closes the DPRC device in the MC.
+ * It destroys the corresponding fsl_mc_dprc object.
+ */
+static int dprc_remove(struct fsl_mc_device *mc_dev)
+{
+ struct fsl_mc_dprc *container;
+ int error = -EINVAL;
+
+ if (WARN_ON(mc_dev->magic != FSL_MC_DEVICE_MAGIC))
+ goto error;
+ if (WARN_ON(strcmp(mc_dev->obj_desc.type, "dprc") != 0))
+ goto error;
+ if (WARN_ON(mc_dev->mc_io == NULL))
+ goto error;
+
+ container = mc_dev->mc_dev_data;
+ if (WARN_ON(container->magic != FSL_MC_DPRC_MAGIC))
+ goto error;
+ if (WARN_ON(fsl_mc_bus->magic != FSL_MC_BUS_MAGIC))
+ goto error;
+
+ dprc_remove_all_devices(container);
+ error = dprc_close(mc_dev->mc_io, mc_dev->mc_handle);
+ if (error < 0)
+ FSL_MC_ERROR(&mc_dev->dev, "dprc_close() failed: %d\n", error);
+
+ container->magic = 0x0;
+ devm_kfree(&mc_dev->dev, container);
+
+ 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,
+};
+
+module_fsl_mc_driver(dprc_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor Inc.");
+MODULE_DESCRIPTION("Freescale's DPRC container driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/fsl_mc_private.h b/include/linux/fsl_mc_private.h
index dabd030..4eacb2a 100644
--- a/include/linux/fsl_mc_private.h
+++ b/include/linux/fsl_mc_private.h
@@ -25,6 +25,8 @@
__func__, ##__VA_ARGS__); \
} while (0)
+#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)
@@ -78,7 +80,7 @@ struct fsl_mc_device *__must_check
fsl_mc_device_lookup(struct dprc_obj_desc
int __must_check dprc_scan_container(struct fsl_mc_dprc *container);
-int __must_check dprc_discover_container_objects(struct fsl_mc_dprc
*container);
+int __must_check dprc_discover_objects(struct fsl_mc_dprc *container);
extern struct fsl_mc_bus *fsl_mc_bus;
--
1.7.9.7
--
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