diff options
Diffstat (limited to 'drivers/bus/fsl-mc/fsl-mc-allocator.c')
| -rw-r--r-- | drivers/bus/fsl-mc/fsl-mc-allocator.c | 669 |
1 files changed, 669 insertions, 0 deletions
diff --git a/drivers/bus/fsl-mc/fsl-mc-allocator.c b/drivers/bus/fsl-mc/fsl-mc-allocator.c new file mode 100644 index 000000000..2d7c764bb --- /dev/null +++ b/drivers/bus/fsl-mc/fsl-mc-allocator.c @@ -0,0 +1,669 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * fsl-mc object allocator driver + * + * Copyright (C) 2013-2016 Freescale Semiconductor, Inc. + * + */ + +#include <linux/module.h> +#include <linux/msi.h> +#include <linux/fsl/mc.h> + +#include "fsl-mc-private.h" + +static bool __must_check fsl_mc_is_allocatable(struct fsl_mc_device *mc_dev) +{ + return is_fsl_mc_bus_dpbp(mc_dev) || + is_fsl_mc_bus_dpmcp(mc_dev) || + is_fsl_mc_bus_dpcon(mc_dev); +} + +/** + * fsl_mc_resource_pool_add_device - add allocatable object to a resource + * pool of a given fsl-mc bus + * + * @mc_bus: pointer to the fsl-mc bus + * @pool_type: pool type + * @mc_dev: pointer to allocatable fsl-mc device + */ +static int __must_check fsl_mc_resource_pool_add_device(struct fsl_mc_bus + *mc_bus, + enum fsl_mc_pool_type + pool_type, + struct fsl_mc_device + *mc_dev) +{ + struct fsl_mc_resource_pool *res_pool; + struct fsl_mc_resource *resource; + struct fsl_mc_device *mc_bus_dev = &mc_bus->mc_dev; + int error = -EINVAL; + + if (pool_type < 0 || pool_type >= FSL_MC_NUM_POOL_TYPES) + goto out; + if (!fsl_mc_is_allocatable(mc_dev)) + goto out; + if (mc_dev->resource) + goto out; + + res_pool = &mc_bus->resource_pools[pool_type]; + if (res_pool->type != pool_type) + goto out; + if (res_pool->mc_bus != mc_bus) + goto out; + + mutex_lock(&res_pool->mutex); + + if (res_pool->max_count < 0) + goto out_unlock; + if (res_pool->free_count < 0 || + res_pool->free_count > res_pool->max_count) + goto out_unlock; + + resource = devm_kzalloc(&mc_bus_dev->dev, sizeof(*resource), + GFP_KERNEL); + if (!resource) { + error = -ENOMEM; + dev_err(&mc_bus_dev->dev, + "Failed to allocate memory for fsl_mc_resource\n"); + goto out_unlock; + } + + resource->type = pool_type; + resource->id = mc_dev->obj_desc.id; + resource->data = mc_dev; + resource->parent_pool = res_pool; + INIT_LIST_HEAD(&resource->node); + list_add_tail(&resource->node, &res_pool->free_list); + mc_dev->resource = resource; + res_pool->free_count++; + res_pool->max_count++; + error = 0; +out_unlock: + mutex_unlock(&res_pool->mutex); +out: + return error; +} + +/** + * fsl_mc_resource_pool_remove_device - remove an allocatable device from a + * resource pool + * + * @mc_dev: pointer to allocatable fsl-mc device + * + * It permanently removes an allocatable fsl-mc device from the resource + * pool. It's an error if the device is in use. + */ +static int __must_check fsl_mc_resource_pool_remove_device(struct fsl_mc_device + *mc_dev) +{ + struct fsl_mc_device *mc_bus_dev; + struct fsl_mc_bus *mc_bus; + struct fsl_mc_resource_pool *res_pool; + struct fsl_mc_resource *resource; + int error = -EINVAL; + + if (!fsl_mc_is_allocatable(mc_dev)) + goto out; + + resource = mc_dev->resource; + if (!resource || resource->data != mc_dev) + goto out; + + mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent); + mc_bus = to_fsl_mc_bus(mc_bus_dev); + res_pool = resource->parent_pool; + if (res_pool != &mc_bus->resource_pools[resource->type]) + goto out; + + mutex_lock(&res_pool->mutex); + + if (res_pool->max_count <= 0) + goto out_unlock; + if (res_pool->free_count <= 0 || + res_pool->free_count > res_pool->max_count) + goto out_unlock; + + /* + * If the device is currently allocated, its resource is not + * in the free list and thus, the device cannot be removed. + */ + if (list_empty(&resource->node)) { + error = -EBUSY; + dev_err(&mc_bus_dev->dev, + "Device %s cannot be removed from resource pool\n", + dev_name(&mc_dev->dev)); + goto out_unlock; + } + + list_del_init(&resource->node); + res_pool->free_count--; + res_pool->max_count--; + + devm_kfree(&mc_bus_dev->dev, resource); + mc_dev->resource = NULL; + error = 0; +out_unlock: + mutex_unlock(&res_pool->mutex); +out: + return error; +} + +static const char *const fsl_mc_pool_type_strings[] = { + [FSL_MC_POOL_DPMCP] = "dpmcp", + [FSL_MC_POOL_DPBP] = "dpbp", + [FSL_MC_POOL_DPCON] = "dpcon", + [FSL_MC_POOL_IRQ] = "irq", +}; + +static int __must_check object_type_to_pool_type(const char *object_type, + enum fsl_mc_pool_type + *pool_type) +{ + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(fsl_mc_pool_type_strings); i++) { + if (strcmp(object_type, fsl_mc_pool_type_strings[i]) == 0) { + *pool_type = i; + return 0; + } + } + + return -EINVAL; +} + +int __must_check fsl_mc_resource_allocate(struct fsl_mc_bus *mc_bus, + enum fsl_mc_pool_type pool_type, + struct fsl_mc_resource **new_resource) +{ + struct fsl_mc_resource_pool *res_pool; + struct fsl_mc_resource *resource; + struct fsl_mc_device *mc_bus_dev = &mc_bus->mc_dev; + int error = -EINVAL; + + BUILD_BUG_ON(ARRAY_SIZE(fsl_mc_pool_type_strings) != + FSL_MC_NUM_POOL_TYPES); + + *new_resource = NULL; + if (pool_type < 0 || pool_type >= FSL_MC_NUM_POOL_TYPES) + goto out; + + res_pool = &mc_bus->resource_pools[pool_type]; + if (res_pool->mc_bus != mc_bus) + goto out; + + mutex_lock(&res_pool->mutex); + resource = list_first_entry_or_null(&res_pool->free_list, + struct fsl_mc_resource, node); + + if (!resource) { + error = -ENXIO; + dev_err(&mc_bus_dev->dev, + "No more resources of type %s left\n", + fsl_mc_pool_type_strings[pool_type]); + goto out_unlock; + } + + if (resource->type != pool_type) + goto out_unlock; + if (resource->parent_pool != res_pool) + goto out_unlock; + if (res_pool->free_count <= 0 || + res_pool->free_count > res_pool->max_count) + goto out_unlock; + + list_del_init(&resource->node); + + res_pool->free_count--; + error = 0; +out_unlock: + mutex_unlock(&res_pool->mutex); + *new_resource = resource; +out: + return error; +} +EXPORT_SYMBOL_GPL(fsl_mc_resource_allocate); + +void fsl_mc_resource_free(struct fsl_mc_resource *resource) +{ + struct fsl_mc_resource_pool *res_pool; + + res_pool = resource->parent_pool; + if (resource->type != res_pool->type) + return; + + mutex_lock(&res_pool->mutex); + if (res_pool->free_count < 0 || + res_pool->free_count >= res_pool->max_count) + goto out_unlock; + + if (!list_empty(&resource->node)) + goto out_unlock; + + list_add_tail(&resource->node, &res_pool->free_list); + res_pool->free_count++; +out_unlock: + mutex_unlock(&res_pool->mutex); +} +EXPORT_SYMBOL_GPL(fsl_mc_resource_free); + +/** + * fsl_mc_object_allocate - Allocates an fsl-mc object of the given + * pool type from a given fsl-mc bus instance + * + * @mc_dev: fsl-mc device which is used in conjunction with the + * allocated object + * @pool_type: pool type + * @new_mc_dev: pointer to area where the pointer to the allocated device + * is to be returned + * + * Allocatable objects are always used in conjunction with some functional + * device. This function allocates an object of the specified type from + * the DPRC containing the functional device. + * + * NOTE: pool_type must be different from FSL_MC_POOL_MCP, since MC + * portals are allocated using fsl_mc_portal_allocate(), instead of + * this function. + */ +int __must_check fsl_mc_object_allocate(struct fsl_mc_device *mc_dev, + enum fsl_mc_pool_type pool_type, + struct fsl_mc_device **new_mc_adev) +{ + struct fsl_mc_device *mc_bus_dev; + struct fsl_mc_bus *mc_bus; + struct fsl_mc_device *mc_adev; + int error = -EINVAL; + struct fsl_mc_resource *resource = NULL; + + *new_mc_adev = NULL; + if (mc_dev->flags & FSL_MC_IS_DPRC) + goto error; + + if (!dev_is_fsl_mc(mc_dev->dev.parent)) + goto error; + + if (pool_type == FSL_MC_POOL_DPMCP) + goto error; + + mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent); + mc_bus = to_fsl_mc_bus(mc_bus_dev); + error = fsl_mc_resource_allocate(mc_bus, pool_type, &resource); + if (error < 0) + goto error; + + mc_adev = resource->data; + if (!mc_adev) { + error = -EINVAL; + goto error; + } + + mc_adev->consumer_link = device_link_add(&mc_dev->dev, + &mc_adev->dev, + DL_FLAG_AUTOREMOVE_CONSUMER); + if (!mc_adev->consumer_link) { + error = -EINVAL; + goto error; + } + + *new_mc_adev = mc_adev; + return 0; +error: + if (resource) + fsl_mc_resource_free(resource); + + return error; +} +EXPORT_SYMBOL_GPL(fsl_mc_object_allocate); + +/** + * fsl_mc_object_free - Returns an fsl-mc object to the resource + * pool where it came from. + * @mc_adev: Pointer to the fsl-mc device + */ +void fsl_mc_object_free(struct fsl_mc_device *mc_adev) +{ + struct fsl_mc_resource *resource; + + resource = mc_adev->resource; + if (resource->type == FSL_MC_POOL_DPMCP) + return; + if (resource->data != mc_adev) + return; + + fsl_mc_resource_free(resource); + + mc_adev->consumer_link = NULL; +} +EXPORT_SYMBOL_GPL(fsl_mc_object_free); + +/* + * A DPRC and the devices in the DPRC all share the same GIC-ITS device + * ID. A block of IRQs is pre-allocated and maintained in a pool + * from which devices can allocate them when needed. + */ + +/* + * Initialize the interrupt pool associated with an fsl-mc bus. + * It allocates a block of IRQs from the GIC-ITS. + */ +int fsl_mc_populate_irq_pool(struct fsl_mc_device *mc_bus_dev, + unsigned int irq_count) +{ + unsigned int i; + struct msi_desc *msi_desc; + struct fsl_mc_device_irq *irq_resources; + struct fsl_mc_device_irq *mc_dev_irq; + int error; + struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev); + struct fsl_mc_resource_pool *res_pool = + &mc_bus->resource_pools[FSL_MC_POOL_IRQ]; + + /* do nothing if the IRQ pool is already populated */ + if (mc_bus->irq_resources) + return 0; + + if (irq_count == 0 || + irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS) + return -EINVAL; + + error = fsl_mc_msi_domain_alloc_irqs(&mc_bus_dev->dev, irq_count); + if (error < 0) + return error; + + irq_resources = devm_kcalloc(&mc_bus_dev->dev, + irq_count, sizeof(*irq_resources), + GFP_KERNEL); + if (!irq_resources) { + error = -ENOMEM; + goto cleanup_msi_irqs; + } + + for (i = 0; i < irq_count; i++) { + mc_dev_irq = &irq_resources[i]; + + /* + * NOTE: This mc_dev_irq's MSI addr/value pair will be set + * by the fsl_mc_msi_write_msg() callback + */ + mc_dev_irq->resource.type = res_pool->type; + mc_dev_irq->resource.data = mc_dev_irq; + mc_dev_irq->resource.parent_pool = res_pool; + INIT_LIST_HEAD(&mc_dev_irq->resource.node); + list_add_tail(&mc_dev_irq->resource.node, &res_pool->free_list); + } + + for_each_msi_entry(msi_desc, &mc_bus_dev->dev) { + mc_dev_irq = &irq_resources[msi_desc->fsl_mc.msi_index]; + mc_dev_irq->msi_desc = msi_desc; + mc_dev_irq->resource.id = msi_desc->irq; + } + + res_pool->max_count = irq_count; + res_pool->free_count = irq_count; + mc_bus->irq_resources = irq_resources; + return 0; + +cleanup_msi_irqs: + fsl_mc_msi_domain_free_irqs(&mc_bus_dev->dev); + return error; +} +EXPORT_SYMBOL_GPL(fsl_mc_populate_irq_pool); + +/** + * Teardown the interrupt pool associated with an fsl-mc bus. + * It frees the IRQs that were allocated to the pool, back to the GIC-ITS. + */ +void fsl_mc_cleanup_irq_pool(struct fsl_mc_device *mc_bus_dev) +{ + struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev); + struct fsl_mc_resource_pool *res_pool = + &mc_bus->resource_pools[FSL_MC_POOL_IRQ]; + + if (!mc_bus->irq_resources) + return; + + if (res_pool->max_count == 0) + return; + + if (res_pool->free_count != res_pool->max_count) + return; + + INIT_LIST_HEAD(&res_pool->free_list); + res_pool->max_count = 0; + res_pool->free_count = 0; + mc_bus->irq_resources = NULL; + fsl_mc_msi_domain_free_irqs(&mc_bus_dev->dev); +} +EXPORT_SYMBOL_GPL(fsl_mc_cleanup_irq_pool); + +/** + * Allocate the IRQs required by a given fsl-mc device. + */ +int __must_check fsl_mc_allocate_irqs(struct fsl_mc_device *mc_dev) +{ + int i; + int irq_count; + int res_allocated_count = 0; + int error = -EINVAL; + struct fsl_mc_device_irq **irqs = NULL; + struct fsl_mc_bus *mc_bus; + struct fsl_mc_resource_pool *res_pool; + + if (mc_dev->irqs) + return -EINVAL; + + irq_count = mc_dev->obj_desc.irq_count; + if (irq_count == 0) + return -EINVAL; + + if (is_fsl_mc_bus_dprc(mc_dev)) + mc_bus = to_fsl_mc_bus(mc_dev); + else + mc_bus = to_fsl_mc_bus(to_fsl_mc_device(mc_dev->dev.parent)); + + if (!mc_bus->irq_resources) + return -EINVAL; + + res_pool = &mc_bus->resource_pools[FSL_MC_POOL_IRQ]; + if (res_pool->free_count < irq_count) { + dev_err(&mc_dev->dev, + "Not able to allocate %u irqs for device\n", irq_count); + return -ENOSPC; + } + + irqs = devm_kcalloc(&mc_dev->dev, irq_count, sizeof(irqs[0]), + GFP_KERNEL); + if (!irqs) + return -ENOMEM; + + for (i = 0; i < irq_count; i++) { + struct fsl_mc_resource *resource; + + error = fsl_mc_resource_allocate(mc_bus, FSL_MC_POOL_IRQ, + &resource); + if (error < 0) + goto error_resource_alloc; + + irqs[i] = to_fsl_mc_irq(resource); + res_allocated_count++; + + irqs[i]->mc_dev = mc_dev; + irqs[i]->dev_irq_index = i; + } + + mc_dev->irqs = irqs; + return 0; + +error_resource_alloc: + for (i = 0; i < res_allocated_count; i++) { + irqs[i]->mc_dev = NULL; + fsl_mc_resource_free(&irqs[i]->resource); + } + + return error; +} +EXPORT_SYMBOL_GPL(fsl_mc_allocate_irqs); + +/* + * Frees the IRQs that were allocated for an fsl-mc device. + */ +void fsl_mc_free_irqs(struct fsl_mc_device *mc_dev) +{ + int i; + int irq_count; + struct fsl_mc_bus *mc_bus; + struct fsl_mc_device_irq **irqs = mc_dev->irqs; + + if (!irqs) + return; + + irq_count = mc_dev->obj_desc.irq_count; + + if (is_fsl_mc_bus_dprc(mc_dev)) + mc_bus = to_fsl_mc_bus(mc_dev); + else + mc_bus = to_fsl_mc_bus(to_fsl_mc_device(mc_dev->dev.parent)); + + if (!mc_bus->irq_resources) + return; + + for (i = 0; i < irq_count; i++) { + irqs[i]->mc_dev = NULL; + fsl_mc_resource_free(&irqs[i]->resource); + } + + mc_dev->irqs = NULL; +} +EXPORT_SYMBOL_GPL(fsl_mc_free_irqs); + +void fsl_mc_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 fsl_mc_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; + + list_for_each_entry_safe(resource, next, &res_pool->free_list, node) { + free_count++; + devm_kfree(&mc_bus_dev->dev, resource); + } +} + +void fsl_mc_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++) + fsl_mc_cleanup_resource_pool(mc_bus_dev, pool_type); +} + +/** + * fsl_mc_allocator_probe - callback invoked when an allocatable device is + * being added to the system + */ +static int fsl_mc_allocator_probe(struct fsl_mc_device *mc_dev) +{ + enum fsl_mc_pool_type pool_type; + struct fsl_mc_device *mc_bus_dev; + struct fsl_mc_bus *mc_bus; + int error; + + if (!fsl_mc_is_allocatable(mc_dev)) + return -EINVAL; + + mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent); + if (!dev_is_fsl_mc(&mc_bus_dev->dev)) + return -EINVAL; + + mc_bus = to_fsl_mc_bus(mc_bus_dev); + error = object_type_to_pool_type(mc_dev->obj_desc.type, &pool_type); + if (error < 0) + return error; + + error = fsl_mc_resource_pool_add_device(mc_bus, pool_type, mc_dev); + if (error < 0) + return error; + + dev_dbg(&mc_dev->dev, + "Allocatable fsl-mc device bound to fsl_mc_allocator driver"); + return 0; +} + +/** + * fsl_mc_allocator_remove - callback invoked when an allocatable device is + * being removed from the system + */ +static int fsl_mc_allocator_remove(struct fsl_mc_device *mc_dev) +{ + int error; + + if (!fsl_mc_is_allocatable(mc_dev)) + return -EINVAL; + + if (mc_dev->resource) { + error = fsl_mc_resource_pool_remove_device(mc_dev); + if (error < 0) + return error; + } + + dev_dbg(&mc_dev->dev, + "Allocatable fsl-mc device unbound from fsl_mc_allocator driver"); + return 0; +} + +static const struct fsl_mc_device_id match_id_table[] = { + { + .vendor = FSL_MC_VENDOR_FREESCALE, + .obj_type = "dpbp", + }, + { + .vendor = FSL_MC_VENDOR_FREESCALE, + .obj_type = "dpmcp", + }, + { + .vendor = FSL_MC_VENDOR_FREESCALE, + .obj_type = "dpcon", + }, + {.vendor = 0x0}, +}; + +static struct fsl_mc_driver fsl_mc_allocator_driver = { + .driver = { + .name = "fsl_mc_allocator", + .pm = NULL, + }, + .match_id_table = match_id_table, + .probe = fsl_mc_allocator_probe, + .remove = fsl_mc_allocator_remove, +}; + +int __init fsl_mc_allocator_driver_init(void) +{ + return fsl_mc_driver_register(&fsl_mc_allocator_driver); +} + +void fsl_mc_allocator_driver_exit(void) +{ + fsl_mc_driver_unregister(&fsl_mc_allocator_driver); +} |