666 lines
17 KiB
C
666 lines
17 KiB
C
/*
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* fsl-mc object allocator driver
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*
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* Copyright (C) 2013-2016 Freescale Semiconductor, Inc.
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/module.h>
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#include <linux/msi.h>
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#include "../include/mc.h"
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#include "fsl-mc-private.h"
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static bool __must_check fsl_mc_is_allocatable(const char *obj_type)
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{
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return strcmp(obj_type, "dpbp") == 0 ||
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strcmp(obj_type, "dpmcp") == 0 ||
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strcmp(obj_type, "dpcon") == 0;
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}
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/**
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* fsl_mc_resource_pool_add_device - add allocatable object to a resource
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* pool of a given fsl-mc bus
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*
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* @mc_bus: pointer to the fsl-mc bus
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* @pool_type: pool type
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* @mc_dev: pointer to allocatable fsl-mc device
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*/
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static int __must_check fsl_mc_resource_pool_add_device(struct fsl_mc_bus
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*mc_bus,
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enum fsl_mc_pool_type
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pool_type,
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struct fsl_mc_device
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*mc_dev)
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{
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struct fsl_mc_resource_pool *res_pool;
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struct fsl_mc_resource *resource;
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struct fsl_mc_device *mc_bus_dev = &mc_bus->mc_dev;
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int error = -EINVAL;
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if (WARN_ON(pool_type < 0 || pool_type >= FSL_MC_NUM_POOL_TYPES))
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goto out;
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if (WARN_ON(!fsl_mc_is_allocatable(mc_dev->obj_desc.type)))
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goto out;
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if (WARN_ON(mc_dev->resource))
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goto out;
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res_pool = &mc_bus->resource_pools[pool_type];
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if (WARN_ON(res_pool->type != pool_type))
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goto out;
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if (WARN_ON(res_pool->mc_bus != mc_bus))
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goto out;
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mutex_lock(&res_pool->mutex);
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if (WARN_ON(res_pool->max_count < 0))
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goto out_unlock;
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if (WARN_ON(res_pool->free_count < 0 ||
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res_pool->free_count > res_pool->max_count))
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goto out_unlock;
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resource = devm_kzalloc(&mc_bus_dev->dev, sizeof(*resource),
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GFP_KERNEL);
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if (!resource) {
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error = -ENOMEM;
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dev_err(&mc_bus_dev->dev,
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"Failed to allocate memory for fsl_mc_resource\n");
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goto out_unlock;
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}
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resource->type = pool_type;
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resource->id = mc_dev->obj_desc.id;
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resource->data = mc_dev;
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resource->parent_pool = res_pool;
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INIT_LIST_HEAD(&resource->node);
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list_add_tail(&resource->node, &res_pool->free_list);
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mc_dev->resource = resource;
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res_pool->free_count++;
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res_pool->max_count++;
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error = 0;
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out_unlock:
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mutex_unlock(&res_pool->mutex);
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out:
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return error;
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}
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/**
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* fsl_mc_resource_pool_remove_device - remove an allocatable device from a
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* resource pool
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*
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* @mc_dev: pointer to allocatable fsl-mc device
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*
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* It permanently removes an allocatable fsl-mc device from the resource
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* pool. It's an error if the device is in use.
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*/
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static int __must_check fsl_mc_resource_pool_remove_device(struct fsl_mc_device
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*mc_dev)
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{
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struct fsl_mc_device *mc_bus_dev;
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struct fsl_mc_bus *mc_bus;
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struct fsl_mc_resource_pool *res_pool;
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struct fsl_mc_resource *resource;
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int error = -EINVAL;
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if (WARN_ON(!fsl_mc_is_allocatable(mc_dev->obj_desc.type)))
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goto out;
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resource = mc_dev->resource;
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if (WARN_ON(!resource || resource->data != mc_dev))
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goto out;
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mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
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mc_bus = to_fsl_mc_bus(mc_bus_dev);
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res_pool = resource->parent_pool;
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if (WARN_ON(res_pool != &mc_bus->resource_pools[resource->type]))
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goto out;
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mutex_lock(&res_pool->mutex);
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if (WARN_ON(res_pool->max_count <= 0))
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goto out_unlock;
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if (WARN_ON(res_pool->free_count <= 0 ||
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res_pool->free_count > res_pool->max_count))
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goto out_unlock;
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/*
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* If the device is currently allocated, its resource is not
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* in the free list and thus, the device cannot be removed.
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*/
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if (list_empty(&resource->node)) {
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error = -EBUSY;
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dev_err(&mc_bus_dev->dev,
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"Device %s cannot be removed from resource pool\n",
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dev_name(&mc_dev->dev));
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goto out_unlock;
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}
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list_del_init(&resource->node);
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res_pool->free_count--;
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res_pool->max_count--;
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devm_kfree(&mc_bus_dev->dev, resource);
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mc_dev->resource = NULL;
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error = 0;
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out_unlock:
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mutex_unlock(&res_pool->mutex);
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out:
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return error;
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}
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static const char *const fsl_mc_pool_type_strings[] = {
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[FSL_MC_POOL_DPMCP] = "dpmcp",
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[FSL_MC_POOL_DPBP] = "dpbp",
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[FSL_MC_POOL_DPCON] = "dpcon",
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[FSL_MC_POOL_IRQ] = "irq",
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};
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static int __must_check object_type_to_pool_type(const char *object_type,
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enum fsl_mc_pool_type
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*pool_type)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(fsl_mc_pool_type_strings); i++) {
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if (strcmp(object_type, fsl_mc_pool_type_strings[i]) == 0) {
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*pool_type = i;
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return 0;
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}
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}
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return -EINVAL;
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}
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int __must_check fsl_mc_resource_allocate(struct fsl_mc_bus *mc_bus,
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enum fsl_mc_pool_type pool_type,
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struct fsl_mc_resource **new_resource)
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{
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struct fsl_mc_resource_pool *res_pool;
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struct fsl_mc_resource *resource;
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struct fsl_mc_device *mc_bus_dev = &mc_bus->mc_dev;
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int error = -EINVAL;
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BUILD_BUG_ON(ARRAY_SIZE(fsl_mc_pool_type_strings) !=
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FSL_MC_NUM_POOL_TYPES);
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*new_resource = NULL;
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if (WARN_ON(pool_type < 0 || pool_type >= FSL_MC_NUM_POOL_TYPES))
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goto out;
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res_pool = &mc_bus->resource_pools[pool_type];
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if (WARN_ON(res_pool->mc_bus != mc_bus))
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goto out;
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mutex_lock(&res_pool->mutex);
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resource = list_first_entry_or_null(&res_pool->free_list,
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struct fsl_mc_resource, node);
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if (!resource) {
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WARN_ON(res_pool->free_count != 0);
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error = -ENXIO;
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dev_err(&mc_bus_dev->dev,
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"No more resources of type %s left\n",
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fsl_mc_pool_type_strings[pool_type]);
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goto out_unlock;
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}
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if (WARN_ON(resource->type != pool_type))
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goto out_unlock;
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if (WARN_ON(resource->parent_pool != res_pool))
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goto out_unlock;
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if (WARN_ON(res_pool->free_count <= 0 ||
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res_pool->free_count > res_pool->max_count))
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goto out_unlock;
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list_del_init(&resource->node);
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res_pool->free_count--;
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error = 0;
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out_unlock:
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mutex_unlock(&res_pool->mutex);
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*new_resource = resource;
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out:
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return error;
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}
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EXPORT_SYMBOL_GPL(fsl_mc_resource_allocate);
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void fsl_mc_resource_free(struct fsl_mc_resource *resource)
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{
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struct fsl_mc_resource_pool *res_pool;
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res_pool = resource->parent_pool;
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if (WARN_ON(resource->type != res_pool->type))
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return;
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mutex_lock(&res_pool->mutex);
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if (WARN_ON(res_pool->free_count < 0 ||
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res_pool->free_count >= res_pool->max_count))
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goto out_unlock;
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if (WARN_ON(!list_empty(&resource->node)))
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goto out_unlock;
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list_add_tail(&resource->node, &res_pool->free_list);
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res_pool->free_count++;
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out_unlock:
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mutex_unlock(&res_pool->mutex);
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}
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EXPORT_SYMBOL_GPL(fsl_mc_resource_free);
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/**
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* fsl_mc_object_allocate - Allocates an fsl-mc object of the given
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* pool type from a given fsl-mc bus instance
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*
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* @mc_dev: fsl-mc device which is used in conjunction with the
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* allocated object
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* @pool_type: pool type
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* @new_mc_dev: pointer to area where the pointer to the allocated device
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* is to be returned
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*
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* Allocatable objects are always used in conjunction with some functional
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* device. This function allocates an object of the specified type from
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* the DPRC containing the functional device.
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*
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* NOTE: pool_type must be different from FSL_MC_POOL_MCP, since MC
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* portals are allocated using fsl_mc_portal_allocate(), instead of
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* this function.
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*/
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int __must_check fsl_mc_object_allocate(struct fsl_mc_device *mc_dev,
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enum fsl_mc_pool_type pool_type,
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struct fsl_mc_device **new_mc_adev)
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{
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struct fsl_mc_device *mc_bus_dev;
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struct fsl_mc_bus *mc_bus;
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struct fsl_mc_device *mc_adev;
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int error = -EINVAL;
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struct fsl_mc_resource *resource = NULL;
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*new_mc_adev = NULL;
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if (WARN_ON(mc_dev->flags & FSL_MC_IS_DPRC))
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goto error;
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if (WARN_ON(!dev_is_fsl_mc(mc_dev->dev.parent)))
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goto error;
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if (WARN_ON(pool_type == FSL_MC_POOL_DPMCP))
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goto error;
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mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
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mc_bus = to_fsl_mc_bus(mc_bus_dev);
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error = fsl_mc_resource_allocate(mc_bus, pool_type, &resource);
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if (error < 0)
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goto error;
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mc_adev = resource->data;
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if (WARN_ON(!mc_adev))
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goto error;
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*new_mc_adev = mc_adev;
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return 0;
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error:
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if (resource)
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fsl_mc_resource_free(resource);
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return error;
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}
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EXPORT_SYMBOL_GPL(fsl_mc_object_allocate);
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/**
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* fsl_mc_object_free - Returns an fsl-mc object to the resource
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* pool where it came from.
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* @mc_adev: Pointer to the fsl-mc device
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*/
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void fsl_mc_object_free(struct fsl_mc_device *mc_adev)
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{
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struct fsl_mc_resource *resource;
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resource = mc_adev->resource;
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if (WARN_ON(resource->type == FSL_MC_POOL_DPMCP))
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return;
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if (WARN_ON(resource->data != mc_adev))
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return;
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fsl_mc_resource_free(resource);
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}
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EXPORT_SYMBOL_GPL(fsl_mc_object_free);
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/*
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* A DPRC and the devices in the DPRC all share the same GIC-ITS device
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* ID. A block of IRQs is pre-allocated and maintained in a pool
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* from which devices can allocate them when needed.
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*/
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/*
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* Initialize the interrupt pool associated with an fsl-mc bus.
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* It allocates a block of IRQs from the GIC-ITS.
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*/
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int fsl_mc_populate_irq_pool(struct fsl_mc_bus *mc_bus,
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unsigned int irq_count)
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{
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unsigned int i;
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struct msi_desc *msi_desc;
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struct fsl_mc_device_irq *irq_resources;
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struct fsl_mc_device_irq *mc_dev_irq;
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int error;
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struct fsl_mc_device *mc_bus_dev = &mc_bus->mc_dev;
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struct fsl_mc_resource_pool *res_pool =
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&mc_bus->resource_pools[FSL_MC_POOL_IRQ];
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if (WARN_ON(irq_count == 0 ||
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irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS))
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return -EINVAL;
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error = fsl_mc_msi_domain_alloc_irqs(&mc_bus_dev->dev, irq_count);
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if (error < 0)
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return error;
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irq_resources = devm_kzalloc(&mc_bus_dev->dev,
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sizeof(*irq_resources) * irq_count,
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GFP_KERNEL);
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if (!irq_resources) {
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error = -ENOMEM;
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goto cleanup_msi_irqs;
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}
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for (i = 0; i < irq_count; i++) {
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mc_dev_irq = &irq_resources[i];
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/*
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* NOTE: This mc_dev_irq's MSI addr/value pair will be set
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* by the fsl_mc_msi_write_msg() callback
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*/
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mc_dev_irq->resource.type = res_pool->type;
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mc_dev_irq->resource.data = mc_dev_irq;
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mc_dev_irq->resource.parent_pool = res_pool;
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INIT_LIST_HEAD(&mc_dev_irq->resource.node);
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list_add_tail(&mc_dev_irq->resource.node, &res_pool->free_list);
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}
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for_each_msi_entry(msi_desc, &mc_bus_dev->dev) {
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mc_dev_irq = &irq_resources[msi_desc->fsl_mc.msi_index];
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mc_dev_irq->msi_desc = msi_desc;
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mc_dev_irq->resource.id = msi_desc->irq;
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}
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res_pool->max_count = irq_count;
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res_pool->free_count = irq_count;
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mc_bus->irq_resources = irq_resources;
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return 0;
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cleanup_msi_irqs:
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fsl_mc_msi_domain_free_irqs(&mc_bus_dev->dev);
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return error;
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}
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EXPORT_SYMBOL_GPL(fsl_mc_populate_irq_pool);
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/**
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* Teardown the interrupt pool associated with an fsl-mc bus.
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* It frees the IRQs that were allocated to the pool, back to the GIC-ITS.
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*/
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void fsl_mc_cleanup_irq_pool(struct fsl_mc_bus *mc_bus)
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{
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struct fsl_mc_device *mc_bus_dev = &mc_bus->mc_dev;
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struct fsl_mc_resource_pool *res_pool =
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&mc_bus->resource_pools[FSL_MC_POOL_IRQ];
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if (WARN_ON(!mc_bus->irq_resources))
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return;
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if (WARN_ON(res_pool->max_count == 0))
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return;
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if (WARN_ON(res_pool->free_count != res_pool->max_count))
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return;
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INIT_LIST_HEAD(&res_pool->free_list);
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res_pool->max_count = 0;
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res_pool->free_count = 0;
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mc_bus->irq_resources = NULL;
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fsl_mc_msi_domain_free_irqs(&mc_bus_dev->dev);
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}
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EXPORT_SYMBOL_GPL(fsl_mc_cleanup_irq_pool);
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/**
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* Allocate the IRQs required by a given fsl-mc device.
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*/
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int __must_check fsl_mc_allocate_irqs(struct fsl_mc_device *mc_dev)
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{
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int i;
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int irq_count;
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int res_allocated_count = 0;
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int error = -EINVAL;
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struct fsl_mc_device_irq **irqs = NULL;
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struct fsl_mc_bus *mc_bus;
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struct fsl_mc_resource_pool *res_pool;
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if (WARN_ON(mc_dev->irqs))
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return -EINVAL;
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irq_count = mc_dev->obj_desc.irq_count;
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if (WARN_ON(irq_count == 0))
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return -EINVAL;
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if (strcmp(mc_dev->obj_desc.type, "dprc") == 0)
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mc_bus = to_fsl_mc_bus(mc_dev);
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else
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mc_bus = to_fsl_mc_bus(to_fsl_mc_device(mc_dev->dev.parent));
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if (WARN_ON(!mc_bus->irq_resources))
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return -EINVAL;
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res_pool = &mc_bus->resource_pools[FSL_MC_POOL_IRQ];
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if (res_pool->free_count < irq_count) {
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dev_err(&mc_dev->dev,
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"Not able to allocate %u irqs for device\n", irq_count);
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return -ENOSPC;
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}
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irqs = devm_kzalloc(&mc_dev->dev, irq_count * sizeof(irqs[0]),
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GFP_KERNEL);
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if (!irqs)
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return -ENOMEM;
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for (i = 0; i < irq_count; i++) {
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struct fsl_mc_resource *resource;
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error = fsl_mc_resource_allocate(mc_bus, FSL_MC_POOL_IRQ,
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&resource);
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if (error < 0)
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goto error_resource_alloc;
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irqs[i] = to_fsl_mc_irq(resource);
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res_allocated_count++;
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WARN_ON(irqs[i]->mc_dev);
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irqs[i]->mc_dev = mc_dev;
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irqs[i]->dev_irq_index = i;
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}
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mc_dev->irqs = irqs;
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return 0;
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error_resource_alloc:
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for (i = 0; i < res_allocated_count; i++) {
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irqs[i]->mc_dev = NULL;
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fsl_mc_resource_free(&irqs[i]->resource);
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}
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return error;
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}
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EXPORT_SYMBOL_GPL(fsl_mc_allocate_irqs);
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/*
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* Frees the IRQs that were allocated for an fsl-mc device.
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*/
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void fsl_mc_free_irqs(struct fsl_mc_device *mc_dev)
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{
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int i;
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int irq_count;
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struct fsl_mc_bus *mc_bus;
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struct fsl_mc_device_irq **irqs = mc_dev->irqs;
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if (WARN_ON(!irqs))
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return;
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irq_count = mc_dev->obj_desc.irq_count;
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if (strcmp(mc_dev->obj_desc.type, "dprc") == 0)
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mc_bus = to_fsl_mc_bus(mc_dev);
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else
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mc_bus = to_fsl_mc_bus(to_fsl_mc_device(mc_dev->dev.parent));
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if (WARN_ON(!mc_bus->irq_resources))
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return;
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for (i = 0; i < irq_count; i++) {
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WARN_ON(!irqs[i]->mc_dev);
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irqs[i]->mc_dev = NULL;
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fsl_mc_resource_free(&irqs[i]->resource);
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}
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mc_dev->irqs = NULL;
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}
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EXPORT_SYMBOL_GPL(fsl_mc_free_irqs);
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void fsl_mc_init_all_resource_pools(struct fsl_mc_device *mc_bus_dev)
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{
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int pool_type;
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struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev);
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for (pool_type = 0; pool_type < FSL_MC_NUM_POOL_TYPES; pool_type++) {
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struct fsl_mc_resource_pool *res_pool =
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&mc_bus->resource_pools[pool_type];
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res_pool->type = pool_type;
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res_pool->max_count = 0;
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res_pool->free_count = 0;
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res_pool->mc_bus = mc_bus;
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INIT_LIST_HEAD(&res_pool->free_list);
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mutex_init(&res_pool->mutex);
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}
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}
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static void fsl_mc_cleanup_resource_pool(struct fsl_mc_device *mc_bus_dev,
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enum fsl_mc_pool_type pool_type)
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{
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struct fsl_mc_resource *resource;
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struct fsl_mc_resource *next;
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struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev);
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struct fsl_mc_resource_pool *res_pool =
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&mc_bus->resource_pools[pool_type];
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int free_count = 0;
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WARN_ON(res_pool->type != pool_type);
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WARN_ON(res_pool->free_count != res_pool->max_count);
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list_for_each_entry_safe(resource, next, &res_pool->free_list, node) {
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free_count++;
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WARN_ON(resource->type != res_pool->type);
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WARN_ON(resource->parent_pool != res_pool);
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devm_kfree(&mc_bus_dev->dev, resource);
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}
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WARN_ON(free_count != res_pool->free_count);
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}
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void fsl_mc_cleanup_all_resource_pools(struct fsl_mc_device *mc_bus_dev)
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{
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int pool_type;
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for (pool_type = 0; pool_type < FSL_MC_NUM_POOL_TYPES; pool_type++)
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fsl_mc_cleanup_resource_pool(mc_bus_dev, pool_type);
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}
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/**
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* fsl_mc_allocator_probe - callback invoked when an allocatable device is
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* being added to the system
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*/
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static int fsl_mc_allocator_probe(struct fsl_mc_device *mc_dev)
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{
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enum fsl_mc_pool_type pool_type;
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struct fsl_mc_device *mc_bus_dev;
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struct fsl_mc_bus *mc_bus;
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int error;
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if (WARN_ON(!fsl_mc_is_allocatable(mc_dev->obj_desc.type)))
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return -EINVAL;
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mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
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if (WARN_ON(!dev_is_fsl_mc(&mc_bus_dev->dev)))
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return -EINVAL;
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mc_bus = to_fsl_mc_bus(mc_bus_dev);
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error = object_type_to_pool_type(mc_dev->obj_desc.type, &pool_type);
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if (error < 0)
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return error;
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error = fsl_mc_resource_pool_add_device(mc_bus, pool_type, mc_dev);
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if (error < 0)
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return error;
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dev_dbg(&mc_dev->dev,
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"Allocatable fsl-mc device bound to fsl_mc_allocator driver");
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return 0;
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}
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/**
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* fsl_mc_allocator_remove - callback invoked when an allocatable device is
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* being removed from the system
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*/
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static int fsl_mc_allocator_remove(struct fsl_mc_device *mc_dev)
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{
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int error;
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if (WARN_ON(!fsl_mc_is_allocatable(mc_dev->obj_desc.type)))
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return -EINVAL;
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if (mc_dev->resource) {
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error = fsl_mc_resource_pool_remove_device(mc_dev);
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if (error < 0)
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return error;
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}
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dev_dbg(&mc_dev->dev,
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"Allocatable fsl-mc device unbound from fsl_mc_allocator driver");
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return 0;
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}
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static const struct fsl_mc_device_id match_id_table[] = {
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{
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.vendor = FSL_MC_VENDOR_FREESCALE,
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.obj_type = "dpbp",
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},
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{
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.vendor = FSL_MC_VENDOR_FREESCALE,
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.obj_type = "dpmcp",
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},
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{
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.vendor = FSL_MC_VENDOR_FREESCALE,
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.obj_type = "dpcon",
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},
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{.vendor = 0x0},
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};
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static struct fsl_mc_driver fsl_mc_allocator_driver = {
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.driver = {
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.name = "fsl_mc_allocator",
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.pm = NULL,
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},
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.match_id_table = match_id_table,
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.probe = fsl_mc_allocator_probe,
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.remove = fsl_mc_allocator_remove,
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};
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int __init fsl_mc_allocator_driver_init(void)
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{
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return fsl_mc_driver_register(&fsl_mc_allocator_driver);
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}
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void fsl_mc_allocator_driver_exit(void)
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{
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fsl_mc_driver_unregister(&fsl_mc_allocator_driver);
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}
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