/**************************************************************************** * wireless/ieee802154_indalloc.c * * Copyright (C) 2017 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include "mac802154.h" /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #if !defined(CONFIG_IEEE802154_IND_PREALLOC) || CONFIG_IEEE802154_IND_PREALLOC < 0 # undef CONFIG_IEEE802154_IND_PREALLOC # define CONFIG_IEEE802154_IND_PREALLOC 20 #endif #if !defined(CONFIG_IEEE802154_IND_IRQRESERVE) || CONFIG_IEEE802154_IND_IRQRESERVE < 0 # undef CONFIG_IEEE802154_IND_IRQRESERVE # define CONFIG_IEEE802154_IND_IRQRESERVE 10 #endif #if CONFIG_IEEE802154_IND_IRQRESERVE > CONFIG_IEEE802154_IND_PREALLOC # undef CONFIG_IEEE802154_IND_IRQRESERVE # define CONFIG_IEEE802154_IND_IRQRESERVE CONFIG_IEEE802154_IND_PREALLOC #endif /* Memory Pools */ #define POOL_IND_GENERAL 0 #define POOL_IND_IRQ 1 #define POOL_IND_DYNAMIC 2 /**************************************************************************** * Private Data ****************************************************************************/ #if CONFIG_IEEE802154_IND_PREALLOC > 0 #if CONFIG_IEEE802154_IND_PREALLOC > CONFIG_IEEE802154_IND_IRQRESERVE /* The g_indfree is a list of meta-data structures that are available for * general use. The number of messages in this list is a system configuration * item. */ static struct ieee802154_data_ind_s *g_indfree; #endif #if CONFIG_IEEE802154_IND_IRQRESERVE > 0 /* The g_indfree_irq is a list of meta-data structures that are reserved for * use by only by interrupt handlers. */ static struct ieee802154_data_ind_s *g_indfree_irq; #endif /* Pool of pre-allocated meta-data stuctures */ static struct ieee802154_data_ind_s g_indpool[CONFIG_IEEE802154_IND_PREALLOC]; #endif /* CONFIG_IEEE802154_IND_PREALLOC > 0 */ /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: ieee802154_indpool_initialize * * Description: * This function initializes the meta-data allocator. This function must * be called early in the initialization sequence before any radios * begin operation. * * Inputs: * None * * Return Value: * None * ****************************************************************************/ void ieee802154_indpool_initialize(void) { #if CONFIG_IEEE802154_IND_PREALLOC > 0 FAR struct ieee802154_data_ind_s *pool = g_indpool; int remaining = CONFIG_IEEE802154_IND_PREALLOC; #if CONFIG_IEEE802154_IND_PREALLOC > CONFIG_IEEE802154_IND_IRQRESERVE /* Initialize g_indfree, thelist of meta-data structures that are available * for general use. */ g_indfree = NULL; while (remaining > CONFIG_IEEE802154_IND_IRQRESERVE) { FAR struct ieee802154_data_ind_s *ind = pool; /* Add the next meta data structure from the pool to the list of * general structures. */ ind->flink = g_indfree; g_indfree = ind; /* Set up for the next structure from the pool */ pool++; remaining--; } #endif #if CONFIG_IEEE802154_IND_IRQRESERVE > 0 /* Initialize g_indfree_irq is a list of meta-data structures reserved for * use by only by interrupt handlers. */ g_indfree_irq = NULL; while (remaining > 0) { FAR struct ieee802154_data_ind_s *ind = pool; /* Add the next meta data structure from the pool to the list of * general structures. */ ind->flink = g_indfree_irq; g_indfree_irq = ind; /* Set up for the next structure from the pool */ pool++; remaining--; } #endif #endif /* CONFIG_IEEE802154_IND_PREALLOC > 0 */ } /**************************************************************************** * Name: ieee802154_ind_allocate * * Description: * The ieee802154_ind_allocate function will get a free meta-data * structure for use by the IEEE 802.15.4 MAC. * * Interrupt handling logic will first attempt to allocate from the * g_indfree list. If that list is empty, it will attempt to allocate * from its reserve, g_indfree_irq. If that list is empty, then the * allocation fails (NULL is returned). * * Non-interrupt handler logic will attempt to allocate from g_indfree * list. If that the list is empty, then the meta-data structure will be * allocated from the dynamic memory pool. * * Inputs: * None * * Return Value: * A reference to the allocated msg structure. All user fields in this * structure have been zeroed. On a failure to allocate, NULL is * returned. * ****************************************************************************/ FAR struct ieee802154_data_ind_s *ieee802154_ind_allocate(void) { #if CONFIG_IEEE802154_IND_PREALLOC > 0 FAR struct ieee802154_data_ind_s *ind; irqstate_t flags; uint8_t pool; /* If we were called from an interrupt handler, then try to get the meta- * data structure from generally available list of messages. If this fails, * then try the list of messages reserved for interrupt handlers */ flags = enter_critical_section(); /* Always necessary in SMP mode */ if (up_interrupt_context()) { #if CONFIG_IEEE802154_IND_PREALLOC > CONFIG_IEEE802154_IND_IRQRESERVE /* Try the general free list */ if (g_indfree != NULL) { ind = g_indfree; g_indfree = ind->flink; leave_critical_section(flags); pool = POOL_IND_GENERAL; } else #endif #if CONFIG_IEEE802154_IND_IRQRESERVE > 0 /* Try the list list reserved for interrupt handlers */ if (g_indfree_irq != NULL) { ind = g_indfree_irq; g_indfree_irq = ind->flink; leave_critical_section(flags); pool = POOL_IND_IRQ; } else #endif { leave_critical_section(flags); return NULL; } } /* We were not called from an interrupt handler. */ else { #if CONFIG_IEEE802154_IND_PREALLOC > CONFIG_IEEE802154_IND_IRQRESERVE /* Try the general free list */ if (g_indfree != NULL) { ind = g_indfree; g_indfree = ind->flink; leave_critical_section(flags); pool = POOL_IND_GENERAL; } else #endif { /* If we cannot a meta-data structure from the free list, then we * will have to allocate one from the kernal memory pool. */ leave_critical_section(flags); ind = (FAR struct ieee802154_data_ind_s *) kmm_malloc((sizeof (struct ieee802154_data_ind_s))); /* Check if we allocated the meta-data structure */ if (ind != NULL) { /* Yes... remember that this meta-data structure was dynamically allocated */ pool = POOL_IND_DYNAMIC; } } } /* We have successfully allocated memory from some source. * Zero and tag the alloated meta-data structure. */ memset(ind, 0, sizeof(struct ieee802154_data_ind_s)); ind->pool = pool; return ind; #else return NULL; #endif } /**************************************************************************** * Name: ieee802154_ind_free * * Description: * The ieee802154_ind_free function will return a meta-data structure to * the free pool of messages if it was a pre-allocated meta-data * structure. If the meta-data structure was allocated dynamically it will * be deallocated. * * Inputs: * ind - meta-data structure to free * * Return Value: * None * ****************************************************************************/ void ieee802154_ind_free(FAR struct ieee802154_data_ind_s *ind) { #if CONFIG_IEEE802154_IND_PREALLOC > 0 irqstate_t flags; #if CONFIG_IEEE802154_IND_PREALLOC > CONFIG_IEEE802154_IND_IRQRESERVE /* If this is a generally available pre-allocated meta-data structure, * then just put it back in the free list. */ if (ind->pool == POOL_IND_GENERAL) { /* Make sure we avoid concurrent access to the free * list from interrupt handlers. */ flags = enter_critical_section(); ind->flink = g_indfree; g_indfree = ind; leave_critical_section(flags); } else #endif #if CONFIG_IEEE802154_IND_IRQRESERVE > 0 /* If this is a meta-data structure pre-allocated for interrupts, * then put it back in the correct free list. */ if (ind->pool == POOL_IND_IRQ) { /* Make sure we avoid concurrent access to the free * list from interrupt handlers. */ flags = enter_critical_section(); ind->flink = g_indfree_irq; g_indfree_irq = ind; leave_critical_section(flags); } else #endif { /* Otherwise, deallocate it. */ DEBUGASSERT(ind->pool == POOL_IND_DYNAMIC); sched_kfree(ind); } #endif }