--- /dev/null
+/*
+ * Freescale data path resource container (DPRC) driver
+ *
+ * Copyright (C) 2014 Freescale Semiconductor, Inc.
+ * Author: German Rivera <German.Rivera@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 "../include/mc-private.h"
+#include "../include/mc-sys.h"
+#include <linux/module.h>
+#include <linux/slab.h>
+#include "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);
+ WARN_ON(!data);
+ 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);
+ WARN_ON(data);
+ 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 ? to_fsl_mc_device(dev) : NULL;
+}
+
+/**
+ * check_plugged_state_change - Check change in an MC object's plugged state
+ *
+ * @mc_dev: pointer to the fsl-mc device for a given MC object
+ * @obj_desc: pointer to the MC object's descriptor in the MC
+ *
+ * If the plugged state has changed from unplugged to plugged, the fsl-mc
+ * device is bound to the corresponding device driver.
+ * If the plugged state has changed from plugged to unplugged, the fsl-mc
+ * device is unbound from the corresponding device driver.
+ */
+static void check_plugged_state_change(struct fsl_mc_device *mc_dev,
+ struct dprc_obj_desc *obj_desc)
+{
+ int error;
+ uint32_t plugged_flag_at_mc =
+ (obj_desc->state & DPRC_OBJ_STATE_PLUGGED);
+
+ if (plugged_flag_at_mc !=
+ (mc_dev->obj_desc.state & DPRC_OBJ_STATE_PLUGGED)) {
+ if (plugged_flag_at_mc) {
+ mc_dev->obj_desc.state |= DPRC_OBJ_STATE_PLUGGED;
+ error = device_attach(&mc_dev->dev);
+ if (error < 0) {
+ dev_err(&mc_dev->dev,
+ "device_attach() failed: %d\n",
+ error);
+ }
+ } else {
+ mc_dev->obj_desc.state &= ~DPRC_OBJ_STATE_PLUGGED;
+ device_release_driver(&mc_dev->dev);
+ }
+ }
+}
+
+/**
+ * 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 fsl_mc_device *child_dev;
+ 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) {
+ check_plugged_state_change(child_dev, obj_desc);
+ continue;
+ }
+
+ error = fsl_mc_device_add(obj_desc, NULL, &mc_bus_dev->dev,
+ &child_dev);
+ if (error < 0)
+ continue;
+ }
+}
+
+static void dprc_init_all_resource_pools(struct fsl_mc_device *mc_bus_dev)
+{
+ int pool_type;
+ struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev);
+
+ for (pool_type = 0; pool_type < FSL_MC_NUM_POOL_TYPES; pool_type++) {
+ struct fsl_mc_resource_pool *res_pool =
+ &mc_bus->resource_pools[pool_type];
+
+ res_pool->type = pool_type;
+ res_pool->max_count = 0;
+ res_pool->free_count = 0;
+ res_pool->mc_bus = mc_bus;
+ INIT_LIST_HEAD(&res_pool->free_list);
+ mutex_init(&res_pool->mutex);
+ }
+}
+
+static void dprc_cleanup_resource_pool(struct fsl_mc_device *mc_bus_dev,
+ enum fsl_mc_pool_type pool_type)
+{
+ struct fsl_mc_resource *resource;
+ struct fsl_mc_resource *next;
+ struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev);
+ struct fsl_mc_resource_pool *res_pool =
+ &mc_bus->resource_pools[pool_type];
+ int free_count = 0;
+
+ WARN_ON(res_pool->type != pool_type);
+ WARN_ON(res_pool->free_count != res_pool->max_count);
+
+ list_for_each_entry_safe(resource, next, &res_pool->free_list, node) {
+ free_count++;
+ WARN_ON(resource->type != res_pool->type);
+ WARN_ON(resource->parent_pool != res_pool);
+ devm_kfree(&mc_bus_dev->dev, resource);
+ }
+
+ WARN_ON(free_count != res_pool->free_count);
+}
+
+static void dprc_cleanup_all_resource_pools(struct fsl_mc_device *mc_bus_dev)
+{
+ int pool_type;
+
+ for (pool_type = 0; pool_type < FSL_MC_NUM_POOL_TYPES; pool_type++)
+ dprc_cleanup_resource_pool(mc_bus_dev, pool_type);
+}
+
+/**
+ * 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.
+ * Two types of devices can be found in a DPRC: allocatable objects (e.g.,
+ * dpbp, dpmcp) and non-allocatable devices (e.g., dprc, dpni).
+ * All allocatable devices needed to be probed before all non-allocatable
+ * devices, to ensure that device drivers for non-allocatable
+ * devices can allocate any type of allocatable devices.
+ * That is, we need to ensure that the corresponding resource pools are
+ * populated before they can get allocation requests from probe callbacks
+ * of the device drivers for the non-allocatable devices.
+ */
+int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev)
+{
+ int num_child_objects;
+ int dprc_get_obj_failures;
+ int error;
+ 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);
+ return error;
+ }
+
+ 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)
+ return -ENOMEM;
+
+ /*
+ * 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_dbg(&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);
+
+ if (child_obj_desc_array)
+ devm_kfree(&mc_bus_dev->dev, child_obj_desc_array);
+
+ return 0;
+}
+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;
+ struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev);
+
+ dprc_init_all_resource_pools(mc_bus_dev);
+
+ /*
+ * Discover objects in the DPRC:
+ */
+ mutex_lock(&mc_bus->scan_mutex);
+ error = dprc_scan_objects(mc_bus_dev);
+ mutex_unlock(&mc_bus->scan_mutex);
+ if (error < 0)
+ goto error;
+
+ return 0;
+error:
+ dprc_cleanup_all_resource_pools(mc_bus_dev);
+ 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.
+ * It creates the interrupt pool for the MC bus associated with the DPRC.
+ * It configures the interrupts for the DPRC device itself.
+ */
+static int dprc_probe(struct fsl_mc_device *mc_dev)
+{
+ int error;
+ size_t region_size;
+ struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
+
+ if (WARN_ON(strcmp(mc_dev->obj_desc.type, "dprc") != 0))
+ return -EINVAL;
+
+ if (!mc_dev->mc_io) {
+ /*
+ * This is a child DPRC:
+ */
+ if (WARN_ON(mc_dev->obj_desc.region_count == 0))
+ return -EINVAL;
+
+ region_size = mc_dev->regions[0].end -
+ mc_dev->regions[0].start + 1;
+
+ error = fsl_create_mc_io(&mc_dev->dev,
+ mc_dev->regions[0].start,
+ region_size,
+ NULL, 0, &mc_dev->mc_io);
+ if (error < 0)
+ return 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_cleanup_mc_io;
+ }
+
+ mutex_init(&mc_bus->scan_mutex);
+
+ /*
+ * Discover MC objects in DPRC object:
+ */
+ error = dprc_scan_container(mc_dev);
+ if (error < 0)
+ goto error_cleanup_open;
+
+ dev_info(&mc_dev->dev, "DPRC device bound to driver");
+ return 0;
+
+error_cleanup_open:
+ (void)dprc_close(mc_dev->mc_io, mc_dev->mc_handle);
+
+error_cleanup_mc_io:
+ fsl_destroy_mc_io(mc_dev->mc_io);
+ 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.
+ * 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)
+{
+ int error;
+
+ if (WARN_ON(strcmp(mc_dev->obj_desc.type, "dprc") != 0))
+ return -EINVAL;
+ if (WARN_ON(!mc_dev->mc_io))
+ return -EINVAL;
+
+ device_for_each_child(&mc_dev->dev, NULL, __fsl_mc_device_remove);
+ dprc_cleanup_all_resource_pools(mc_dev);
+ 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;
+}
+
+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);
+}
Code Review / kvmfornfv.git / blobdiff