/* Copyright (c) 2011-2016, 2018, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ipc_router_private.h" #include "ipc_router_security.h" enum { SMEM_LOG = 1U << 0, RTR_DBG = 1U << 1, }; static int msm_ipc_router_debug_mask; module_param_named(debug_mask, msm_ipc_router_debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP); #define MODULE_NAME "ipc_router" #define IPC_RTR_INFO_PAGES 6 #define IPC_RTR_INFO(log_ctx, x...) do { \ if (log_ctx) \ ipc_log_string(log_ctx, x); \ if (msm_ipc_router_debug_mask & RTR_DBG) \ pr_info("[IPCRTR] "x); \ } while (0) #define IPC_ROUTER_LOG_EVENT_TX 0x01 #define IPC_ROUTER_LOG_EVENT_RX 0x02 #define IPC_ROUTER_LOG_EVENT_TX_ERR 0x03 #define IPC_ROUTER_LOG_EVENT_RX_ERR 0x04 #define IPC_ROUTER_DUMMY_DEST_NODE 0xFFFFFFFF #define ipc_port_sk(port) ((struct sock *)(port)) static LIST_HEAD(control_ports); static DECLARE_RWSEM(control_ports_lock_lha5); #define LP_HASH_SIZE 32 static struct list_head local_ports[LP_HASH_SIZE]; static DECLARE_RWSEM(local_ports_lock_lhc2); /* Server info is organized as a hash table. The server's service ID is * used to index into the hash table. The instance ID of most of the servers * are 1 or 2. The service IDs are well distributed compared to the instance * IDs and hence choosing service ID to index into this hash table optimizes * the hash table operations like add, lookup, destroy. */ #define SRV_HASH_SIZE 32 static struct list_head server_list[SRV_HASH_SIZE]; static DECLARE_RWSEM(server_list_lock_lha2); struct msm_ipc_server { struct list_head list; struct kref ref; struct msm_ipc_port_name name; char pdev_name[32]; int next_pdev_id; int synced_sec_rule; struct list_head server_port_list; }; struct msm_ipc_server_port { struct list_head list; struct platform_device *pdev; struct msm_ipc_port_addr server_addr; struct msm_ipc_router_xprt_info *xprt_info; }; struct msm_ipc_resume_tx_port { struct list_head list; uint32_t port_id; uint32_t node_id; }; struct ipc_router_conn_info { struct list_head list; uint32_t port_id; }; enum { RESET = 0, VALID = 1, }; #define RP_HASH_SIZE 32 struct msm_ipc_router_remote_port { struct list_head list; struct kref ref; struct mutex rport_lock_lhb2; uint32_t node_id; uint32_t port_id; int status; uint32_t tx_quota_cnt; struct list_head resume_tx_port_list; struct list_head conn_info_list; void *sec_rule; struct msm_ipc_server *server; }; struct msm_ipc_router_xprt_info { struct list_head list; struct msm_ipc_router_xprt *xprt; uint32_t remote_node_id; uint32_t initialized; uint32_t hello_sent; struct list_head pkt_list; struct wakeup_source ws; struct mutex rx_lock_lhb2; struct mutex tx_lock_lhb2; uint32_t need_len; uint32_t abort_data_read; struct work_struct read_data; struct workqueue_struct *workqueue; void *log_ctx; struct kref ref; struct completion ref_complete; }; #define RT_HASH_SIZE 4 struct msm_ipc_routing_table_entry { struct list_head list; struct kref ref; uint32_t node_id; uint32_t neighbor_node_id; struct list_head remote_port_list[RP_HASH_SIZE]; struct msm_ipc_router_xprt_info *xprt_info; struct rw_semaphore lock_lha4; unsigned long num_tx_bytes; unsigned long num_rx_bytes; }; #define LOG_CTX_NAME_LEN 32 struct ipc_rtr_log_ctx { struct list_head list; char log_ctx_name[LOG_CTX_NAME_LEN]; void *log_ctx; }; static struct list_head routing_table[RT_HASH_SIZE]; static DECLARE_RWSEM(routing_table_lock_lha3); static int routing_table_inited; static void do_read_data(struct work_struct *work); static LIST_HEAD(xprt_info_list); static DECLARE_RWSEM(xprt_info_list_lock_lha5); static DEFINE_MUTEX(log_ctx_list_lock_lha0); static LIST_HEAD(log_ctx_list); static DEFINE_MUTEX(ipc_router_init_lock); static bool is_ipc_router_inited; static int ipc_router_core_init(void); #define IPC_ROUTER_INIT_TIMEOUT (10 * HZ) static uint32_t next_port_id; static DEFINE_MUTEX(next_port_id_lock_lhc1); static struct workqueue_struct *msm_ipc_router_workqueue; static void *local_log_ctx; static void *ipc_router_get_log_ctx(char *sub_name); static int process_resume_tx_msg(union rr_control_msg *msg, struct rr_packet *pkt); static void ipc_router_reset_conn(struct msm_ipc_router_remote_port *rport_ptr); static int ipc_router_get_xprt_info_ref( struct msm_ipc_router_xprt_info *xprt_info); static void ipc_router_put_xprt_info_ref( struct msm_ipc_router_xprt_info *xprt_info); static void ipc_router_release_xprt_info_ref(struct kref *ref); struct pil_vote_info { void *pil_handle; struct work_struct load_work; struct work_struct unload_work; }; #define PIL_SUBSYSTEM_NAME_LEN 32 static char default_peripheral[PIL_SUBSYSTEM_NAME_LEN]; enum { DOWN, UP, }; /** * is_sensor_port() - Check if the remote port is sensor service or not * @rport: Pointer to the remote port. * * Return: true if the remote port is sensor service else false. */ static int is_sensor_port(struct msm_ipc_router_remote_port *rport) { u32 svcid = 0; if (rport && rport->server) { svcid = rport->server->name.service; if (svcid == 400 || (svcid >= 256 && svcid <= 320)) return true; } return false; } static void init_routing_table(void) { int i; for (i = 0; i < RT_HASH_SIZE; i++) INIT_LIST_HEAD(&routing_table[i]); } /** * ipc_router_calc_checksum() - compute the checksum for extended HELLO message * @msg: Reference to the IPC Router HELLO message. * * Return: Computed checksum value, 0 if msg is NULL. */ static uint32_t ipc_router_calc_checksum(union rr_control_msg *msg) { uint32_t checksum = 0; int i, len; uint16_t upper_nb; uint16_t lower_nb; void *hello; if (!msg) return checksum; hello = msg; len = sizeof(*msg); for (i = 0; i < len/IPCR_WORD_SIZE; i++) { lower_nb = (*((uint32_t *)hello)) & IPC_ROUTER_CHECKSUM_MASK; upper_nb = ((*((uint32_t *)hello)) >> 16) & IPC_ROUTER_CHECKSUM_MASK; checksum = checksum + upper_nb + lower_nb; hello = ((uint32_t *)hello) + 1; } while (checksum > 0xFFFF) checksum = (checksum & IPC_ROUTER_CHECKSUM_MASK) + ((checksum >> 16) & IPC_ROUTER_CHECKSUM_MASK); checksum = ~checksum & IPC_ROUTER_CHECKSUM_MASK; return checksum; } /** * skb_copy_to_log_buf() - copies the required number bytes from the skb_queue * @skb_head: skb_queue head that contains the data. * @pl_len: length of payload need to be copied. * @hdr_offset: length of the header present in first skb * @log_buf: The output buffer which will contain the formatted log string * * This function copies the first specified number of bytes from the skb_queue * to a new buffer and formats them to a string for logging. */ static void skb_copy_to_log_buf(struct sk_buff_head *skb_head, unsigned int pl_len, unsigned int hdr_offset, unsigned char *log_buf) { struct sk_buff *temp_skb; unsigned int copied_len = 0, copy_len = 0; int remaining; if (!skb_head) { IPC_RTR_ERR("%s: NULL skb_head\n", __func__); return; } temp_skb = skb_peek(skb_head); if (unlikely(!temp_skb || !temp_skb->data)) { IPC_RTR_ERR("%s: No SKBs in skb_queue\n", __func__); return; } remaining = temp_skb->len - hdr_offset; skb_queue_walk(skb_head, temp_skb) { copy_len = remaining < pl_len ? remaining : pl_len; memcpy(log_buf + copied_len, temp_skb->data + hdr_offset, copy_len); copied_len += copy_len; hdr_offset = 0; if (copied_len == pl_len) break; remaining = pl_len - remaining; } return; } /** * ipc_router_log_msg() - log all data messages exchanged * @log_ctx: IPC Logging context specfic to each transport * @xchng_type: Identifies the data to be a receive or send. * @data: IPC Router data packet or control msg recieved or to be send. * @hdr: Reference to the router header * @port_ptr: Local IPC Router port. * @rport_ptr: Remote IPC Router port * * This function builds the log message that would be passed on to the IPC * logging framework. The data messages that would be passed corresponds to * the information that is exchanged between the IPC Router and it's clients. */ static void ipc_router_log_msg(void *log_ctx, uint32_t xchng_type, void *data, struct rr_header_v1 *hdr, struct msm_ipc_port *port_ptr, struct msm_ipc_router_remote_port *rport_ptr) { struct sk_buff_head *skb_head = NULL; union rr_control_msg *msg = NULL; struct rr_packet *pkt = NULL; uint64_t pl_buf = 0; struct sk_buff *skb; uint32_t buf_len = 8; uint32_t svcId = 0; uint32_t svcIns = 0; unsigned int hdr_offset = 0; uint32_t port_type = 0; if (!log_ctx || !hdr || !data) return; if (hdr->type == IPC_ROUTER_CTRL_CMD_DATA) { pkt = (struct rr_packet *)data; skb_head = pkt->pkt_fragment_q; skb = skb_peek(skb_head); if (!skb || !skb->data) { IPC_RTR_ERR("%s: No SKBs in skb_queue\n", __func__); return; } if (skb_queue_len(skb_head) == 1 && skb->len < 8) buf_len = skb->len; if (xchng_type == IPC_ROUTER_LOG_EVENT_TX && hdr->dst_node_id != IPC_ROUTER_NID_LOCAL) { if (hdr->version == IPC_ROUTER_V1) hdr_offset = sizeof(struct rr_header_v1); else if (hdr->version == IPC_ROUTER_V2) hdr_offset = sizeof(struct rr_header_v2); } skb_copy_to_log_buf(skb_head, buf_len, hdr_offset, (unsigned char *)&pl_buf); if (port_ptr && rport_ptr && (port_ptr->type == CLIENT_PORT) && (rport_ptr->server != NULL)) { svcId = rport_ptr->server->name.service; svcIns = rport_ptr->server->name.instance; port_type = CLIENT_PORT; } else if (port_ptr && (port_ptr->type == SERVER_PORT)) { svcId = port_ptr->port_name.service; svcIns = port_ptr->port_name.instance; port_type = SERVER_PORT; } IPC_RTR_INFO(log_ctx, "%s %s %s Len:0x%x T:0x%x CF:0x%x SVC:<0x%x:0x%x> SRC:<0x%x:0x%x> DST:<0x%x:0x%x> DATA: %08x %08x", (xchng_type == IPC_ROUTER_LOG_EVENT_RX ? "" : (xchng_type == IPC_ROUTER_LOG_EVENT_TX ? current->comm : "")), (port_type == CLIENT_PORT ? "CLI" : "SRV"), (xchng_type == IPC_ROUTER_LOG_EVENT_RX ? "RX" : (xchng_type == IPC_ROUTER_LOG_EVENT_TX ? "TX" : (xchng_type == IPC_ROUTER_LOG_EVENT_TX_ERR ? "TX_ERR" : (xchng_type == IPC_ROUTER_LOG_EVENT_RX_ERR ? "RX_ERR" : "UNKNOWN")))), hdr->size, hdr->type, hdr->control_flag, svcId, svcIns, hdr->src_node_id, hdr->src_port_id, hdr->dst_node_id, hdr->dst_port_id, (unsigned int)pl_buf, (unsigned int)(pl_buf>>32)); } else { msg = (union rr_control_msg *)data; if (msg->cmd == IPC_ROUTER_CTRL_CMD_NEW_SERVER || msg->cmd == IPC_ROUTER_CTRL_CMD_REMOVE_SERVER) IPC_RTR_INFO(log_ctx, "CTL MSG: %s cmd:0x%x SVC:<0x%x:0x%x> ADDR:<0x%x:0x%x>", (xchng_type == IPC_ROUTER_LOG_EVENT_RX ? "RX" : (xchng_type == IPC_ROUTER_LOG_EVENT_TX ? "TX" : (xchng_type == IPC_ROUTER_LOG_EVENT_TX_ERR ? "TX_ERR" : (xchng_type == IPC_ROUTER_LOG_EVENT_RX_ERR ? "RX_ERR" : "UNKNOWN")))), msg->cmd, msg->srv.service, msg->srv.instance, msg->srv.node_id, msg->srv.port_id); else if (msg->cmd == IPC_ROUTER_CTRL_CMD_REMOVE_CLIENT || msg->cmd == IPC_ROUTER_CTRL_CMD_RESUME_TX) IPC_RTR_INFO(log_ctx, "CTL MSG: %s cmd:0x%x ADDR: <0x%x:0x%x>", (xchng_type == IPC_ROUTER_LOG_EVENT_RX ? "RX" : (xchng_type == IPC_ROUTER_LOG_EVENT_TX ? "TX" : "ERR")), msg->cmd, msg->cli.node_id, msg->cli.port_id); else if (msg->cmd == IPC_ROUTER_CTRL_CMD_HELLO && hdr) IPC_RTR_INFO(log_ctx, "CTL MSG %s cmd:0x%x ADDR:0x%x", (xchng_type == IPC_ROUTER_LOG_EVENT_RX ? "RX" : (xchng_type == IPC_ROUTER_LOG_EVENT_TX ? "TX" : "ERR")), msg->cmd, hdr->src_node_id); else IPC_RTR_INFO(log_ctx, "%s UNKNOWN cmd:0x%x", (xchng_type == IPC_ROUTER_LOG_EVENT_RX ? "RX" : (xchng_type == IPC_ROUTER_LOG_EVENT_TX ? "TX" : "ERR")), msg->cmd); } } /* Must be called with routing_table_lock_lha3 locked. */ static struct msm_ipc_routing_table_entry *lookup_routing_table( uint32_t node_id) { uint32_t key = (node_id % RT_HASH_SIZE); struct msm_ipc_routing_table_entry *rt_entry; list_for_each_entry(rt_entry, &routing_table[key], list) { if (rt_entry->node_id == node_id) return rt_entry; } return NULL; } /** * create_routing_table_entry() - Lookup and create a routing table entry * @node_id: Node ID of the routing table entry to be created. * @xprt_info: XPRT through which the node ID is reachable. * * @return: a reference to the routing table entry on success, NULL on failure. */ static struct msm_ipc_routing_table_entry *create_routing_table_entry( uint32_t node_id, struct msm_ipc_router_xprt_info *xprt_info) { int i; struct msm_ipc_routing_table_entry *rt_entry; uint32_t key; down_write(&routing_table_lock_lha3); rt_entry = lookup_routing_table(node_id); if (rt_entry) goto out_create_rtentry1; rt_entry = kmalloc(sizeof(struct msm_ipc_routing_table_entry), GFP_KERNEL); if (!rt_entry) { IPC_RTR_ERR("%s: rt_entry allocation failed for %d\n", __func__, node_id); goto out_create_rtentry2; } for (i = 0; i < RP_HASH_SIZE; i++) INIT_LIST_HEAD(&rt_entry->remote_port_list[i]); init_rwsem(&rt_entry->lock_lha4); kref_init(&rt_entry->ref); rt_entry->node_id = node_id; rt_entry->xprt_info = xprt_info; if (xprt_info) rt_entry->neighbor_node_id = xprt_info->remote_node_id; key = (node_id % RT_HASH_SIZE); list_add_tail(&rt_entry->list, &routing_table[key]); out_create_rtentry1: kref_get(&rt_entry->ref); out_create_rtentry2: up_write(&routing_table_lock_lha3); return rt_entry; } /** * ipc_router_get_rtentry_ref() - Get a reference to the routing table entry * @node_id: Node ID of the routing table entry. * * @return: a reference to the routing table entry on success, NULL on failure. * * This function is used to obtain a reference to the rounting table entry * corresponding to a node id. */ static struct msm_ipc_routing_table_entry *ipc_router_get_rtentry_ref( uint32_t node_id) { struct msm_ipc_routing_table_entry *rt_entry; down_read(&routing_table_lock_lha3); rt_entry = lookup_routing_table(node_id); if (rt_entry) kref_get(&rt_entry->ref); up_read(&routing_table_lock_lha3); return rt_entry; } /** * ipc_router_release_rtentry() - Cleanup and release the routing table entry * @ref: Reference to the entry. * * This function is called when all references to the routing table entry are * released. */ void ipc_router_release_rtentry(struct kref *ref) { struct msm_ipc_routing_table_entry *rt_entry = container_of(ref, struct msm_ipc_routing_table_entry, ref); /* * All references to a routing entry will be put only under SSR. * As part of SSR, all the internals of the routing table entry * are cleaned. So just free the routing table entry. */ kfree(rt_entry); } struct rr_packet *rr_read(struct msm_ipc_router_xprt_info *xprt_info) { struct rr_packet *temp_pkt; if (!xprt_info) return NULL; mutex_lock(&xprt_info->rx_lock_lhb2); if (xprt_info->abort_data_read) { mutex_unlock(&xprt_info->rx_lock_lhb2); IPC_RTR_ERR("%s detected SSR & exiting now\n", xprt_info->xprt->name); return NULL; } if (list_empty(&xprt_info->pkt_list)) { mutex_unlock(&xprt_info->rx_lock_lhb2); return NULL; } temp_pkt = list_first_entry(&xprt_info->pkt_list, struct rr_packet, list); list_del(&temp_pkt->list); if (list_empty(&xprt_info->pkt_list)) __pm_relax(&xprt_info->ws); mutex_unlock(&xprt_info->rx_lock_lhb2); return temp_pkt; } struct rr_packet *clone_pkt(struct rr_packet *pkt) { struct rr_packet *cloned_pkt; struct sk_buff *temp_skb, *cloned_skb; struct sk_buff_head *pkt_fragment_q; cloned_pkt = kzalloc(sizeof(struct rr_packet), GFP_KERNEL); if (!cloned_pkt) { IPC_RTR_ERR("%s: failure\n", __func__); return NULL; } memcpy(&(cloned_pkt->hdr), &(pkt->hdr), sizeof(struct rr_header_v1)); if (pkt->opt_hdr.len > 0) { cloned_pkt->opt_hdr.data = kmalloc(pkt->opt_hdr.len, GFP_KERNEL); if (!cloned_pkt->opt_hdr.data) { IPC_RTR_ERR("%s: Memory allocation Failed\n", __func__); } else { cloned_pkt->opt_hdr.len = pkt->opt_hdr.len; memcpy(cloned_pkt->opt_hdr.data, pkt->opt_hdr.data, pkt->opt_hdr.len); } } pkt_fragment_q = kmalloc(sizeof(struct sk_buff_head), GFP_KERNEL); if (!pkt_fragment_q) { IPC_RTR_ERR("%s: pkt_frag_q alloc failure\n", __func__); kfree(cloned_pkt); return NULL; } skb_queue_head_init(pkt_fragment_q); kref_init(&cloned_pkt->ref); skb_queue_walk(pkt->pkt_fragment_q, temp_skb) { cloned_skb = skb_clone(temp_skb, GFP_KERNEL); if (!cloned_skb) goto fail_clone; skb_queue_tail(pkt_fragment_q, cloned_skb); } cloned_pkt->pkt_fragment_q = pkt_fragment_q; cloned_pkt->length = pkt->length; return cloned_pkt; fail_clone: while (!skb_queue_empty(pkt_fragment_q)) { temp_skb = skb_dequeue(pkt_fragment_q); kfree_skb(temp_skb); } kfree(pkt_fragment_q); if (cloned_pkt->opt_hdr.len > 0) kfree(cloned_pkt->opt_hdr.data); kfree(cloned_pkt); return NULL; } /** * create_pkt() - Create a Router packet * @data: SKB queue to be contained inside the packet. * * @return: pointer to packet on success, NULL on failure. */ struct rr_packet *create_pkt(struct sk_buff_head *data) { struct rr_packet *pkt; struct sk_buff *temp_skb; pkt = kzalloc(sizeof(struct rr_packet), GFP_KERNEL); if (!pkt) { IPC_RTR_ERR("%s: failure\n", __func__); return NULL; } if (data) { pkt->pkt_fragment_q = data; skb_queue_walk(pkt->pkt_fragment_q, temp_skb) pkt->length += temp_skb->len; } else { pkt->pkt_fragment_q = kmalloc(sizeof(struct sk_buff_head), GFP_KERNEL); if (!pkt->pkt_fragment_q) { IPC_RTR_ERR("%s: Couldn't alloc pkt_fragment_q\n", __func__); kfree(pkt); return NULL; } skb_queue_head_init(pkt->pkt_fragment_q); } kref_init(&pkt->ref); return pkt; } void release_pkt(struct rr_packet *pkt) { struct sk_buff *temp_skb; if (!pkt) return; if (!pkt->pkt_fragment_q) { kfree(pkt); return; } while (!skb_queue_empty(pkt->pkt_fragment_q)) { temp_skb = skb_dequeue(pkt->pkt_fragment_q); kfree_skb(temp_skb); } kfree(pkt->pkt_fragment_q); if (pkt->opt_hdr.len > 0) kfree(pkt->opt_hdr.data); kfree(pkt); return; } static struct sk_buff_head *msm_ipc_router_buf_to_skb(void *buf, unsigned int buf_len) { struct sk_buff_head *skb_head; struct sk_buff *skb; int first = 1, offset = 0; int skb_size, data_size; void *data; int last = 1; int align_size; skb_head = kmalloc(sizeof(struct sk_buff_head), GFP_KERNEL); if (!skb_head) { IPC_RTR_ERR("%s: Couldnot allocate skb_head\n", __func__); return NULL; } skb_queue_head_init(skb_head); data_size = buf_len; align_size = ALIGN_SIZE(data_size); while (offset != buf_len) { skb_size = data_size; if (first) skb_size += IPC_ROUTER_HDR_SIZE; if (last) skb_size += align_size; skb = alloc_skb(skb_size, GFP_KERNEL); if (!skb) { if (skb_size <= (PAGE_SIZE/2)) { IPC_RTR_ERR("%s: cannot allocate skb\n", __func__); goto buf_to_skb_error; } data_size = data_size / 2; last = 0; continue; } if (first) { skb_reserve(skb, IPC_ROUTER_HDR_SIZE); first = 0; } data = skb_put(skb, data_size); memcpy(skb->data, buf + offset, data_size); skb_queue_tail(skb_head, skb); offset += data_size; data_size = buf_len - offset; last = 1; } return skb_head; buf_to_skb_error: while (!skb_queue_empty(skb_head)) { skb = skb_dequeue(skb_head); kfree_skb(skb); } kfree(skb_head); return NULL; } static void *msm_ipc_router_skb_to_buf(struct sk_buff_head *skb_head, unsigned int len) { struct sk_buff *temp; unsigned int offset = 0, buf_len = 0, copy_len; void *buf; if (!skb_head) { IPC_RTR_ERR("%s: NULL skb_head\n", __func__); return NULL; } temp = skb_peek(skb_head); buf_len = len; buf = kmalloc(buf_len, GFP_KERNEL); if (!buf) { IPC_RTR_ERR("%s: cannot allocate buf\n", __func__); return NULL; } skb_queue_walk(skb_head, temp) { copy_len = buf_len < temp->len ? buf_len : temp->len; memcpy(buf + offset, temp->data, copy_len); offset += copy_len; buf_len -= copy_len; } return buf; } void msm_ipc_router_free_skb(struct sk_buff_head *skb_head) { struct sk_buff *temp_skb; if (!skb_head) return; while (!skb_queue_empty(skb_head)) { temp_skb = skb_dequeue(skb_head); kfree_skb(temp_skb); } kfree(skb_head); } /** * extract_optional_header() - Extract the optional header from skb * @pkt: Packet structure into which the header has to be extracted. * @opt_len: The optional header length in word size. * * @return: Length of optional header in bytes if success, zero otherwise. */ static int extract_optional_header(struct rr_packet *pkt, uint8_t opt_len) { size_t offset = 0, buf_len = 0, copy_len, opt_hdr_len; struct sk_buff *temp; struct sk_buff_head *skb_head; opt_hdr_len = opt_len * IPCR_WORD_SIZE; pkt->opt_hdr.data = kmalloc(opt_hdr_len, GFP_KERNEL); if (!pkt->opt_hdr.data) { IPC_RTR_ERR("%s: Memory allocation Failed\n", __func__); return 0; } skb_head = pkt->pkt_fragment_q; buf_len = opt_hdr_len; skb_queue_walk(skb_head, temp) { copy_len = buf_len < temp->len ? buf_len : temp->len; memcpy(pkt->opt_hdr.data + offset, temp->data, copy_len); offset += copy_len; buf_len -= copy_len; skb_pull(temp, copy_len); if (temp->len == 0) { skb_dequeue(skb_head); kfree_skb(temp); } } pkt->opt_hdr.len = opt_hdr_len; return opt_hdr_len; } /** * extract_header_v1() - Extract IPC Router header of version 1 * @pkt: Packet structure into which the header has to be extraced. * @skb: SKB from which the header has to be extracted. * * @return: 0 on success, standard Linux error codes on failure. */ static int extract_header_v1(struct rr_packet *pkt, struct sk_buff *skb) { if (!pkt || !skb) { IPC_RTR_ERR("%s: Invalid pkt or skb\n", __func__); return -EINVAL; } memcpy(&pkt->hdr, skb->data, sizeof(struct rr_header_v1)); skb_pull(skb, sizeof(struct rr_header_v1)); pkt->length -= sizeof(struct rr_header_v1); return 0; } /** * extract_header_v2() - Extract IPC Router header of version 2 * @pkt: Packet structure into which the header has to be extraced. * @skb: SKB from which the header has to be extracted. * * @return: 0 on success, standard Linux error codes on failure. */ static int extract_header_v2(struct rr_packet *pkt, struct sk_buff *skb) { struct rr_header_v2 *hdr; uint8_t opt_len; size_t opt_hdr_len; size_t total_hdr_size = sizeof(*hdr); if (!pkt || !skb) { IPC_RTR_ERR("%s: Invalid pkt or skb\n", __func__); return -EINVAL; } hdr = (struct rr_header_v2 *)skb->data; pkt->hdr.version = (uint32_t)hdr->version; pkt->hdr.type = (uint32_t)hdr->type; pkt->hdr.src_node_id = (uint32_t)hdr->src_node_id; pkt->hdr.src_port_id = (uint32_t)hdr->src_port_id; pkt->hdr.size = (uint32_t)hdr->size; pkt->hdr.control_flag = (uint32_t)hdr->control_flag; pkt->hdr.dst_node_id = (uint32_t)hdr->dst_node_id; pkt->hdr.dst_port_id = (uint32_t)hdr->dst_port_id; opt_len = hdr->opt_len; skb_pull(skb, total_hdr_size); if (opt_len > 0) { opt_hdr_len = extract_optional_header(pkt, opt_len); total_hdr_size += opt_hdr_len; } pkt->length -= total_hdr_size; return 0; } /** * extract_header() - Extract IPC Router header * @pkt: Packet from which the header has to be extraced. * * @return: 0 on success, standard Linux error codes on failure. * * This function will check if the header version is v1 or v2 and invoke * the corresponding helper function to extract the IPC Router header. */ static int extract_header(struct rr_packet *pkt) { struct sk_buff *temp_skb; int ret; if (!pkt) { IPC_RTR_ERR("%s: NULL PKT\n", __func__); return -EINVAL; } temp_skb = skb_peek(pkt->pkt_fragment_q); if (!temp_skb || !temp_skb->data) { IPC_RTR_ERR("%s: No SKBs in skb_queue\n", __func__); return -EINVAL; } if (temp_skb->data[0] == IPC_ROUTER_V1) { ret = extract_header_v1(pkt, temp_skb); } else if (temp_skb->data[0] == IPC_ROUTER_V2) { ret = extract_header_v2(pkt, temp_skb); } else { IPC_RTR_ERR("%s: Invalid Header version %02x\n", __func__, temp_skb->data[0]); print_hex_dump(KERN_ERR, "Header: ", DUMP_PREFIX_ADDRESS, 16, 1, temp_skb->data, pkt->length, true); return -EINVAL; } return ret; } /** * calc_tx_header_size() - Calculate header size to be reserved in SKB * @pkt: Packet in which the space for header has to be reserved. * @dst_xprt_info: XPRT through which the destination is reachable. * * @return: required header size on success, * starndard Linux error codes on failure. * * This function is used to calculate the header size that has to be reserved * in a transmit SKB. The header size is calculated based on the XPRT through * which the destination node is reachable. */ static int calc_tx_header_size(struct rr_packet *pkt, struct msm_ipc_router_xprt_info *dst_xprt_info) { int hdr_size = 0; int xprt_version = 0; struct msm_ipc_router_xprt_info *xprt_info = dst_xprt_info; if (!pkt) { IPC_RTR_ERR("%s: NULL PKT\n", __func__); return -EINVAL; } if (xprt_info) xprt_version = xprt_info->xprt->get_version(xprt_info->xprt); if (xprt_version == IPC_ROUTER_V1) { pkt->hdr.version = IPC_ROUTER_V1; hdr_size = sizeof(struct rr_header_v1); } else if (xprt_version == IPC_ROUTER_V2) { pkt->hdr.version = IPC_ROUTER_V2; hdr_size = sizeof(struct rr_header_v2) + pkt->opt_hdr.len; } else { IPC_RTR_ERR("%s: Invalid xprt_version %d\n", __func__, xprt_version); hdr_size = -EINVAL; } return hdr_size; } /** * calc_rx_header_size() - Calculate the RX header size * @xprt_info: XPRT info of the received message. * * @return: valid header size on success, INT_MAX on failure. */ static int calc_rx_header_size(struct msm_ipc_router_xprt_info *xprt_info) { int xprt_version = 0; int hdr_size = INT_MAX; if (xprt_info) xprt_version = xprt_info->xprt->get_version(xprt_info->xprt); if (xprt_version == IPC_ROUTER_V1) hdr_size = sizeof(struct rr_header_v1); else if (xprt_version == IPC_ROUTER_V2) hdr_size = sizeof(struct rr_header_v2); return hdr_size; } /** * prepend_header_v1() - Prepend IPC Router header of version 1 * @pkt: Packet structure which contains the header info to be prepended. * @hdr_size: Size of the header * * @return: 0 on success, standard Linux error codes on failure. */ static int prepend_header_v1(struct rr_packet *pkt, int hdr_size) { struct sk_buff *temp_skb; struct rr_header_v1 *hdr; if (!pkt || hdr_size <= 0) { IPC_RTR_ERR("%s: Invalid input parameters\n", __func__); return -EINVAL; } temp_skb = skb_peek(pkt->pkt_fragment_q); if (!temp_skb || !temp_skb->data) { IPC_RTR_ERR("%s: No SKBs in skb_queue\n", __func__); return -EINVAL; } if (skb_headroom(temp_skb) < hdr_size) { temp_skb = alloc_skb(hdr_size, GFP_KERNEL); if (!temp_skb) { IPC_RTR_ERR("%s: Could not allocate SKB of size %d\n", __func__, hdr_size); return -ENOMEM; } skb_reserve(temp_skb, hdr_size); } hdr = (struct rr_header_v1 *)skb_push(temp_skb, hdr_size); memcpy(hdr, &pkt->hdr, hdr_size); if (temp_skb != skb_peek(pkt->pkt_fragment_q)) skb_queue_head(pkt->pkt_fragment_q, temp_skb); pkt->length += hdr_size; return 0; } /** * prepend_header_v2() - Prepend IPC Router header of version 2 * @pkt: Packet structure which contains the header info to be prepended. * @hdr_size: Size of the header * * @return: 0 on success, standard Linux error codes on failure. */ static int prepend_header_v2(struct rr_packet *pkt, int hdr_size) { struct sk_buff *temp_skb; struct rr_header_v2 *hdr; if (!pkt || hdr_size <= 0) { IPC_RTR_ERR("%s: Invalid input parameters\n", __func__); return -EINVAL; } temp_skb = skb_peek(pkt->pkt_fragment_q); if (!temp_skb || !temp_skb->data) { IPC_RTR_ERR("%s: No SKBs in skb_queue\n", __func__); return -EINVAL; } if (skb_headroom(temp_skb) < hdr_size) { temp_skb = alloc_skb(hdr_size, GFP_KERNEL); if (!temp_skb) { IPC_RTR_ERR("%s: Could not allocate SKB of size %d\n", __func__, hdr_size); return -ENOMEM; } skb_reserve(temp_skb, hdr_size); } hdr = (struct rr_header_v2 *)skb_push(temp_skb, hdr_size); hdr->version = (uint8_t)pkt->hdr.version; hdr->type = (uint8_t)pkt->hdr.type; hdr->control_flag = (uint8_t)pkt->hdr.control_flag; hdr->size = (uint32_t)pkt->hdr.size; hdr->src_node_id = (uint16_t)pkt->hdr.src_node_id; hdr->src_port_id = (uint16_t)pkt->hdr.src_port_id; hdr->dst_node_id = (uint16_t)pkt->hdr.dst_node_id; hdr->dst_port_id = (uint16_t)pkt->hdr.dst_port_id; if (pkt->opt_hdr.len > 0) { hdr->opt_len = pkt->opt_hdr.len/IPCR_WORD_SIZE; memcpy(hdr + sizeof(*hdr), pkt->opt_hdr.data, pkt->opt_hdr.len); } else { hdr->opt_len = 0; } if (temp_skb != skb_peek(pkt->pkt_fragment_q)) skb_queue_head(pkt->pkt_fragment_q, temp_skb); pkt->length += hdr_size; return 0; } /** * prepend_header() - Prepend IPC Router header * @pkt: Packet structure which contains the header info to be prepended. * @xprt_info: XPRT through which the packet is transmitted. * * @return: 0 on success, standard Linux error codes on failure. * * This function prepends the header to the packet to be transmitted. The * IPC Router header version to be prepended depends on the XPRT through * which the destination is reachable. */ static int prepend_header(struct rr_packet *pkt, struct msm_ipc_router_xprt_info *xprt_info) { int hdr_size; struct sk_buff *temp_skb; if (!pkt) { IPC_RTR_ERR("%s: NULL PKT\n", __func__); return -EINVAL; } temp_skb = skb_peek(pkt->pkt_fragment_q); if (!temp_skb || !temp_skb->data) { IPC_RTR_ERR("%s: No SKBs in skb_queue\n", __func__); return -EINVAL; } hdr_size = calc_tx_header_size(pkt, xprt_info); if (hdr_size <= 0) return hdr_size; if (pkt->hdr.version == IPC_ROUTER_V1) return prepend_header_v1(pkt, hdr_size); else if (pkt->hdr.version == IPC_ROUTER_V2) return prepend_header_v2(pkt, hdr_size); else return -EINVAL; } /** * defragment_pkt() - Defragment and linearize the packet * @pkt: Packet to be linearized. * * @return: 0 on success, standard Linux error codes on failure. * * Some packets contain fragments of data over multiple SKBs. If an XPRT * does not supported fragmented writes, linearize multiple SKBs into one * single SKB. */ static int defragment_pkt(struct rr_packet *pkt) { struct sk_buff *dst_skb, *src_skb, *temp_skb; int offset = 0, buf_len = 0, copy_len; void *buf; int align_size; if (!pkt || pkt->length <= 0) { IPC_RTR_ERR("%s: Invalid PKT\n", __func__); return -EINVAL; } if (skb_queue_len(pkt->pkt_fragment_q) == 1) return 0; align_size = ALIGN_SIZE(pkt->length); dst_skb = alloc_skb(pkt->length + align_size, GFP_KERNEL); if (!dst_skb) { IPC_RTR_ERR("%s: could not allocate one skb of size %d\n", __func__, pkt->length); return -ENOMEM; } buf = skb_put(dst_skb, pkt->length); buf_len = pkt->length; skb_queue_walk(pkt->pkt_fragment_q, src_skb) { copy_len = buf_len < src_skb->len ? buf_len : src_skb->len; memcpy(buf + offset, src_skb->data, copy_len); offset += copy_len; buf_len -= copy_len; } while (!skb_queue_empty(pkt->pkt_fragment_q)) { temp_skb = skb_dequeue(pkt->pkt_fragment_q); kfree_skb(temp_skb); } skb_queue_tail(pkt->pkt_fragment_q, dst_skb); return 0; } static int post_pkt_to_port(struct msm_ipc_port *port_ptr, struct rr_packet *pkt, int clone) { struct rr_packet *temp_pkt = pkt; void (*notify)(unsigned event, void *oob_data, size_t oob_data_len, void *priv); void (*data_ready)(struct sock *sk) = NULL; struct sock *sk; uint32_t pkt_type; if (unlikely(!port_ptr || !pkt)) return -EINVAL; if (clone) { temp_pkt = clone_pkt(pkt); if (!temp_pkt) { IPC_RTR_ERR( "%s: Error cloning packet for port %08x:%08x\n", __func__, port_ptr->this_port.node_id, port_ptr->this_port.port_id); return -ENOMEM; } } mutex_lock(&port_ptr->port_rx_q_lock_lhc3); if (pkt->ws_need) __pm_stay_awake(port_ptr->port_rx_ws); list_add_tail(&temp_pkt->list, &port_ptr->port_rx_q); wake_up(&port_ptr->port_rx_wait_q); notify = port_ptr->notify; pkt_type = temp_pkt->hdr.type; sk = (struct sock *)port_ptr->endpoint; if (sk) { read_lock(&sk->sk_callback_lock); data_ready = sk->sk_data_ready; read_unlock(&sk->sk_callback_lock); } mutex_unlock(&port_ptr->port_rx_q_lock_lhc3); if (notify) notify(pkt_type, NULL, 0, port_ptr->priv); else if (sk && data_ready) data_ready(sk); return 0; } /** * ipc_router_peek_pkt_size() - Peek into the packet header to get potential packet size * @data: Starting address of the packet which points to router header. * * @returns: potential packet size on success, < 0 on error. * * This function is used by the underlying transport abstraction layer to * peek into the potential packet size of an incoming packet. This information * is used to perform link layer fragmentation and re-assembly */ int ipc_router_peek_pkt_size(char *data) { int size; if (!data) { pr_err("%s: NULL PKT\n", __func__); return -EINVAL; } if (data[0] == IPC_ROUTER_V1) size = ((struct rr_header_v1 *)data)->size + sizeof(struct rr_header_v1); else if (data[0] == IPC_ROUTER_V2) size = ((struct rr_header_v2 *)data)->size + ((struct rr_header_v2 *)data)->opt_len * IPCR_WORD_SIZE + sizeof(struct rr_header_v2); else return -EINVAL; size += ALIGN_SIZE(size); return size; } static int post_control_ports(struct rr_packet *pkt) { struct msm_ipc_port *port_ptr; if (!pkt) return -EINVAL; down_read(&control_ports_lock_lha5); list_for_each_entry(port_ptr, &control_ports, list) post_pkt_to_port(port_ptr, pkt, 1); up_read(&control_ports_lock_lha5); return 0; } static uint32_t allocate_port_id(void) { uint32_t port_id = 0, prev_port_id, key; struct msm_ipc_port *port_ptr; mutex_lock(&next_port_id_lock_lhc1); prev_port_id = next_port_id; down_read(&local_ports_lock_lhc2); do { next_port_id++; if ((next_port_id & IPC_ROUTER_ADDRESS) == IPC_ROUTER_ADDRESS) next_port_id = 1; key = (next_port_id & (LP_HASH_SIZE - 1)); if (list_empty(&local_ports[key])) { port_id = next_port_id; break; } list_for_each_entry(port_ptr, &local_ports[key], list) { if (port_ptr->this_port.port_id == next_port_id) { port_id = next_port_id; break; } } if (!port_id) { port_id = next_port_id; break; } port_id = 0; } while (next_port_id != prev_port_id); up_read(&local_ports_lock_lhc2); mutex_unlock(&next_port_id_lock_lhc1); return port_id; } void msm_ipc_router_add_local_port(struct msm_ipc_port *port_ptr) { uint32_t key; if (!port_ptr) return; key = (port_ptr->this_port.port_id & (LP_HASH_SIZE - 1)); down_write(&local_ports_lock_lhc2); list_add_tail(&port_ptr->list, &local_ports[key]); up_write(&local_ports_lock_lhc2); } /** * msm_ipc_router_create_raw_port() - Create an IPC Router port * @endpoint: User-space space socket information to be cached. * @notify: Function to notify incoming events on the port. * @event: Event ID to be handled. * @oob_data: Any out-of-band data associated with the event. * @oob_data_len: Size of the out-of-band data, if valid. * @priv: Private data registered during the port creation. * @priv: Private Data to be passed during the event notification. * * @return: Valid pointer to port on success, NULL on failure. * * This function is used to create an IPC Router port. The port is used for * communication locally or outside the subsystem. */ struct msm_ipc_port *msm_ipc_router_create_raw_port(void *endpoint, void (*notify)(unsigned event, void *oob_data, size_t oob_data_len, void *priv), void *priv) { struct msm_ipc_port *port_ptr; port_ptr = kzalloc(sizeof(struct msm_ipc_port), GFP_KERNEL); if (!port_ptr) return NULL; port_ptr->this_port.node_id = IPC_ROUTER_NID_LOCAL; port_ptr->this_port.port_id = allocate_port_id(); if (!port_ptr->this_port.port_id) { IPC_RTR_ERR("%s: All port ids are in use\n", __func__); kfree(port_ptr); return NULL; } mutex_init(&port_ptr->port_lock_lhc3); INIT_LIST_HEAD(&port_ptr->port_rx_q); mutex_init(&port_ptr->port_rx_q_lock_lhc3); init_waitqueue_head(&port_ptr->port_rx_wait_q); snprintf(port_ptr->rx_ws_name, MAX_WS_NAME_SZ, "ipc%08x_%s", port_ptr->this_port.port_id, current->comm); port_ptr->port_rx_ws = wakeup_source_register(port_ptr->rx_ws_name); if (!port_ptr->port_rx_ws) { kfree(port_ptr); return NULL; } init_waitqueue_head(&port_ptr->port_tx_wait_q); kref_init(&port_ptr->ref); port_ptr->endpoint = endpoint; port_ptr->notify = notify; port_ptr->priv = priv; msm_ipc_router_add_local_port(port_ptr); if (endpoint) sock_hold(ipc_port_sk(endpoint)); return port_ptr; } /** * ipc_router_get_port_ref() - Get a reference to the local port * @port_id: Port ID of the local port for which reference is get. * * @return: If port is found, a reference to the port is returned. * Else NULL is returned. */ static struct msm_ipc_port *ipc_router_get_port_ref(uint32_t port_id) { int key = (port_id & (LP_HASH_SIZE - 1)); struct msm_ipc_port *port_ptr; down_read(&local_ports_lock_lhc2); list_for_each_entry(port_ptr, &local_ports[key], list) { if (port_ptr->this_port.port_id == port_id) { kref_get(&port_ptr->ref); up_read(&local_ports_lock_lhc2); return port_ptr; } } up_read(&local_ports_lock_lhc2); return NULL; } /** * ipc_router_release_port() - Cleanup and release the port * @ref: Reference to the port. * * This function is called when all references to the port are released. */ void ipc_router_release_port(struct kref *ref) { struct rr_packet *pkt, *temp_pkt; struct msm_ipc_port *port_ptr = container_of(ref, struct msm_ipc_port, ref); mutex_lock(&port_ptr->port_rx_q_lock_lhc3); list_for_each_entry_safe(pkt, temp_pkt, &port_ptr->port_rx_q, list) { list_del(&pkt->list); release_pkt(pkt); } mutex_unlock(&port_ptr->port_rx_q_lock_lhc3); wakeup_source_unregister(port_ptr->port_rx_ws); if (port_ptr->endpoint) sock_put(ipc_port_sk(port_ptr->endpoint)); kfree(port_ptr); } /** * ipc_router_get_rport_ref()- Get reference to the remote port * @node_id: Node ID corresponding to the remote port. * @port_id: Port ID corresponding to the remote port. * * @return: a reference to the remote port on success, NULL on failure. */ static struct msm_ipc_router_remote_port *ipc_router_get_rport_ref( uint32_t node_id, uint32_t port_id) { struct msm_ipc_router_remote_port *rport_ptr; struct msm_ipc_routing_table_entry *rt_entry; int key = (port_id & (RP_HASH_SIZE - 1)); rt_entry = ipc_router_get_rtentry_ref(node_id); if (!rt_entry) { IPC_RTR_ERR("%s: Node is not up\n", __func__); return NULL; } down_read(&rt_entry->lock_lha4); list_for_each_entry(rport_ptr, &rt_entry->remote_port_list[key], list) { if (rport_ptr->port_id == port_id) { kref_get(&rport_ptr->ref); goto out_lookup_rmt_port1; } } rport_ptr = NULL; out_lookup_rmt_port1: up_read(&rt_entry->lock_lha4); kref_put(&rt_entry->ref, ipc_router_release_rtentry); return rport_ptr; } /** * ipc_router_create_rport() - Create a remote port * @node_id: Node ID corresponding to the remote port. * @port_id: Port ID corresponding to the remote port. * @xprt_info: XPRT through which the concerned node is reachable. * * @return: a reference to the remote port on success, NULL on failure. */ static struct msm_ipc_router_remote_port *ipc_router_create_rport( uint32_t node_id, uint32_t port_id, struct msm_ipc_router_xprt_info *xprt_info) { struct msm_ipc_router_remote_port *rport_ptr; struct msm_ipc_routing_table_entry *rt_entry; int key = (port_id & (RP_HASH_SIZE - 1)); rt_entry = create_routing_table_entry(node_id, xprt_info); if (!rt_entry) { IPC_RTR_ERR("%s: Node cannot be created\n", __func__); return NULL; } down_write(&rt_entry->lock_lha4); list_for_each_entry(rport_ptr, &rt_entry->remote_port_list[key], list) { if (rport_ptr->port_id == port_id) goto out_create_rmt_port1; } rport_ptr = kmalloc(sizeof(struct msm_ipc_router_remote_port), GFP_KERNEL); if (!rport_ptr) { IPC_RTR_ERR("%s: Remote port alloc failed\n", __func__); goto out_create_rmt_port2; } rport_ptr->port_id = port_id; rport_ptr->node_id = node_id; rport_ptr->status = VALID; rport_ptr->sec_rule = NULL; rport_ptr->server = NULL; rport_ptr->tx_quota_cnt = 0; kref_init(&rport_ptr->ref); mutex_init(&rport_ptr->rport_lock_lhb2); INIT_LIST_HEAD(&rport_ptr->resume_tx_port_list); INIT_LIST_HEAD(&rport_ptr->conn_info_list); list_add_tail(&rport_ptr->list, &rt_entry->remote_port_list[key]); out_create_rmt_port1: kref_get(&rport_ptr->ref); out_create_rmt_port2: up_write(&rt_entry->lock_lha4); kref_put(&rt_entry->ref, ipc_router_release_rtentry); return rport_ptr; } /** * msm_ipc_router_free_resume_tx_port() - Free the resume_tx ports * @rport_ptr: Pointer to the remote port. * * This function deletes all the resume_tx ports associated with a remote port * and frees the memory allocated to each resume_tx port. * * Must be called with rport_ptr->rport_lock_lhb2 locked. */ static void msm_ipc_router_free_resume_tx_port( struct msm_ipc_router_remote_port *rport_ptr) { struct msm_ipc_resume_tx_port *rtx_port, *tmp_rtx_port; list_for_each_entry_safe(rtx_port, tmp_rtx_port, &rport_ptr->resume_tx_port_list, list) { list_del(&rtx_port->list); kfree(rtx_port); } } /** * msm_ipc_router_lookup_resume_tx_port() - Lookup resume_tx port list * @rport_ptr: Remote port whose resume_tx port list needs to be looked. * @port_id: Port ID which needs to be looked from the list. * * return 1 if the port_id is found in the list, else 0. * * This function is used to lookup the existence of a local port in * remote port's resume_tx list. This function is used to ensure that * the same port is not added to the remote_port's resume_tx list repeatedly. * * Must be called with rport_ptr->rport_lock_lhb2 locked. */ static int msm_ipc_router_lookup_resume_tx_port( struct msm_ipc_router_remote_port *rport_ptr, uint32_t port_id) { struct msm_ipc_resume_tx_port *rtx_port; list_for_each_entry(rtx_port, &rport_ptr->resume_tx_port_list, list) { if (port_id == rtx_port->port_id) return 1; } return 0; } /** * ipc_router_dummy_write_space() - Dummy write space available callback * @sk: Socket pointer for which the callback is called. */ void ipc_router_dummy_write_space(struct sock *sk) { } /** * post_resume_tx() - Post the resume_tx event * @rport_ptr: Pointer to the remote port * @pkt : The data packet that is received on a resume_tx event * @msg: Out of band data to be passed to kernel drivers * * This function informs about the reception of the resume_tx message from a * remote port pointed by rport_ptr to all the local ports that are in the * resume_tx_ports_list of this remote port. On posting the information, this * function sequentially deletes each entry in the resume_tx_port_list of the * remote port. * * Must be called with rport_ptr->rport_lock_lhb2 locked. */ static void post_resume_tx(struct msm_ipc_router_remote_port *rport_ptr, struct rr_packet *pkt, union rr_control_msg *msg) { struct msm_ipc_resume_tx_port *rtx_port, *tmp_rtx_port; struct msm_ipc_port *local_port; struct sock *sk; void (*write_space)(struct sock *sk) = NULL; list_for_each_entry_safe(rtx_port, tmp_rtx_port, &rport_ptr->resume_tx_port_list, list) { local_port = ipc_router_get_port_ref(rtx_port->port_id); if (local_port && local_port->notify) { wake_up(&local_port->port_tx_wait_q); local_port->notify(IPC_ROUTER_CTRL_CMD_RESUME_TX, msg, sizeof(*msg), local_port->priv); } else if (local_port) { wake_up(&local_port->port_tx_wait_q); sk = ipc_port_sk(local_port->endpoint); if (sk) { read_lock(&sk->sk_callback_lock); write_space = sk->sk_write_space; read_unlock(&sk->sk_callback_lock); } if (write_space && write_space != ipc_router_dummy_write_space) write_space(sk); else post_pkt_to_port(local_port, pkt, 1); } else { IPC_RTR_ERR("%s: Local Port %d not Found", __func__, rtx_port->port_id); } if (local_port) kref_put(&local_port->ref, ipc_router_release_port); list_del(&rtx_port->list); kfree(rtx_port); } } /** * signal_rport_exit() - Signal the local ports of remote port exit * @rport_ptr: Remote port that is exiting. * * This function is used to signal the local ports that are waiting * to resume transmission to a remote port that is exiting. */ static void signal_rport_exit(struct msm_ipc_router_remote_port *rport_ptr) { struct msm_ipc_resume_tx_port *rtx_port, *tmp_rtx_port; struct msm_ipc_port *local_port; mutex_lock(&rport_ptr->rport_lock_lhb2); rport_ptr->status = RESET; list_for_each_entry_safe(rtx_port, tmp_rtx_port, &rport_ptr->resume_tx_port_list, list) { local_port = ipc_router_get_port_ref(rtx_port->port_id); if (local_port) { wake_up(&local_port->port_tx_wait_q); kref_put(&local_port->ref, ipc_router_release_port); } list_del(&rtx_port->list); kfree(rtx_port); } mutex_unlock(&rport_ptr->rport_lock_lhb2); } /** * ipc_router_release_rport() - Cleanup and release the remote port * @ref: Reference to the remote port. * * This function is called when all references to the remote port are released. */ static void ipc_router_release_rport(struct kref *ref) { struct msm_ipc_router_remote_port *rport_ptr = container_of(ref, struct msm_ipc_router_remote_port, ref); mutex_lock(&rport_ptr->rport_lock_lhb2); msm_ipc_router_free_resume_tx_port(rport_ptr); mutex_unlock(&rport_ptr->rport_lock_lhb2); kfree(rport_ptr); } /** * ipc_router_destroy_rport() - Destroy the remote port * @rport_ptr: Pointer to the remote port to be destroyed. */ static void ipc_router_destroy_rport( struct msm_ipc_router_remote_port *rport_ptr) { uint32_t node_id; struct msm_ipc_routing_table_entry *rt_entry; if (!rport_ptr) return; node_id = rport_ptr->node_id; rt_entry = ipc_router_get_rtentry_ref(node_id); if (!rt_entry) { IPC_RTR_ERR("%s: Node %d is not up\n", __func__, node_id); return; } down_write(&rt_entry->lock_lha4); list_del(&rport_ptr->list); up_write(&rt_entry->lock_lha4); signal_rport_exit(rport_ptr); kref_put(&rport_ptr->ref, ipc_router_release_rport); kref_put(&rt_entry->ref, ipc_router_release_rtentry); return; } /** * msm_ipc_router_lookup_server() - Lookup server information * @service: Service ID of the server info to be looked up. * @instance: Instance ID of the server info to be looked up. * @node_id: Node/Processor ID in which the server is hosted. * @port_id: Port ID within the node in which the server is hosted. * * @return: If found Pointer to server structure, else NULL. * * Note1: Lock the server_list_lock_lha2 before accessing this function. * Note2: If the are <0:0>, then the lookup is restricted * to . Used only when a client wants to send a * message to any QMI server. */ static struct msm_ipc_server *msm_ipc_router_lookup_server( uint32_t service, uint32_t instance, uint32_t node_id, uint32_t port_id) { struct msm_ipc_server *server; struct msm_ipc_server_port *server_port; int key = (service & (SRV_HASH_SIZE - 1)); list_for_each_entry(server, &server_list[key], list) { if ((server->name.service != service) || (server->name.instance != instance)) continue; if ((node_id == 0) && (port_id == 0)) return server; list_for_each_entry(server_port, &server->server_port_list, list) { if ((server_port->server_addr.node_id == node_id) && (server_port->server_addr.port_id == port_id)) return server; } } return NULL; } /** * ipc_router_get_server_ref() - Get reference to the server * @svc: Service ID for which the reference is required. * @ins: Instance ID for which the reference is required. * @node_id: Node/Processor ID in which the server is hosted. * @port_id: Port ID within the node in which the server is hosted. * * @return: If found return reference to server, else NULL. */ static struct msm_ipc_server *ipc_router_get_server_ref( uint32_t svc, uint32_t ins, uint32_t node_id, uint32_t port_id) { struct msm_ipc_server *server; down_read(&server_list_lock_lha2); server = msm_ipc_router_lookup_server(svc, ins, node_id, port_id); if (server) kref_get(&server->ref); up_read(&server_list_lock_lha2); return server; } /** * ipc_router_release_server() - Cleanup and release the server * @ref: Reference to the server. * * This function is called when all references to the server are released. */ static void ipc_router_release_server(struct kref *ref) { struct msm_ipc_server *server = container_of(ref, struct msm_ipc_server, ref); kfree(server); } /** * msm_ipc_router_create_server() - Add server info to hash table * @service: Service ID of the server info to be created. * @instance: Instance ID of the server info to be created. * @node_id: Node/Processor ID in which the server is hosted. * @port_id: Port ID within the node in which the server is hosted. * @xprt_info: XPRT through which the node hosting the server is reached. * * @return: Pointer to server structure on success, else NULL. * * This function adds the server info to the hash table. If the same * server(i.e. ) is hosted in different nodes, * they are maintained as list of "server_port" under "server" structure. */ static struct msm_ipc_server *msm_ipc_router_create_server( uint32_t service, uint32_t instance, uint32_t node_id, uint32_t port_id, struct msm_ipc_router_xprt_info *xprt_info) { struct msm_ipc_server *server = NULL; struct msm_ipc_server_port *server_port; struct platform_device *pdev; int key = (service & (SRV_HASH_SIZE - 1)); down_write(&server_list_lock_lha2); server = msm_ipc_router_lookup_server(service, instance, 0, 0); if (server) { list_for_each_entry(server_port, &server->server_port_list, list) { if ((server_port->server_addr.node_id == node_id) && (server_port->server_addr.port_id == port_id)) goto return_server; } goto create_srv_port; } server = kzalloc(sizeof(struct msm_ipc_server), GFP_KERNEL); if (!server) { up_write(&server_list_lock_lha2); IPC_RTR_ERR("%s: Server allocation failed\n", __func__); return NULL; } server->name.service = service; server->name.instance = instance; server->synced_sec_rule = 0; INIT_LIST_HEAD(&server->server_port_list); kref_init(&server->ref); list_add_tail(&server->list, &server_list[key]); scnprintf(server->pdev_name, sizeof(server->pdev_name), "SVC%08x:%08x", service, instance); server->next_pdev_id = 1; create_srv_port: server_port = kzalloc(sizeof(struct msm_ipc_server_port), GFP_KERNEL); pdev = platform_device_alloc(server->pdev_name, server->next_pdev_id); if (!server_port || !pdev) { kfree(server_port); if (pdev) platform_device_put(pdev); if (list_empty(&server->server_port_list)) { list_del(&server->list); kfree(server); } up_write(&server_list_lock_lha2); IPC_RTR_ERR("%s: Server Port allocation failed\n", __func__); return NULL; } server_port->pdev = pdev; server_port->server_addr.node_id = node_id; server_port->server_addr.port_id = port_id; server_port->xprt_info = xprt_info; list_add_tail(&server_port->list, &server->server_port_list); server->next_pdev_id++; platform_device_add(server_port->pdev); return_server: /* Add a reference so that the caller can put it back */ kref_get(&server->ref); up_write(&server_list_lock_lha2); return server; } /** * ipc_router_destroy_server_nolock() - Remove server info from hash table * @server: Server info to be removed. * @node_id: Node/Processor ID in which the server is hosted. * @port_id: Port ID within the node in which the server is hosted. * * This function removes the server_port identified using * from the server structure. If the server_port list under server structure * is empty after removal, then remove the server structure from the server * hash table. This function must be called with server_list_lock_lha2 locked. */ static void ipc_router_destroy_server_nolock(struct msm_ipc_server *server, uint32_t node_id, uint32_t port_id) { struct msm_ipc_server_port *server_port; bool server_port_found = false; if (!server) return; list_for_each_entry(server_port, &server->server_port_list, list) { if ((server_port->server_addr.node_id == node_id) && (server_port->server_addr.port_id == port_id)) { server_port_found = true; break; } } if (server_port_found && server_port) { platform_device_unregister(server_port->pdev); list_del(&server_port->list); kfree(server_port); } if (list_empty(&server->server_port_list)) { list_del(&server->list); kref_put(&server->ref, ipc_router_release_server); } return; } /** * ipc_router_destroy_server() - Remove server info from hash table * @server: Server info to be removed. * @node_id: Node/Processor ID in which the server is hosted. * @port_id: Port ID within the node in which the server is hosted. * * This function removes the server_port identified using * from the server structure. If the server_port list under server structure * is empty after removal, then remove the server structure from the server * hash table. */ static void ipc_router_destroy_server(struct msm_ipc_server *server, uint32_t node_id, uint32_t port_id) { down_write(&server_list_lock_lha2); ipc_router_destroy_server_nolock(server, node_id, port_id); up_write(&server_list_lock_lha2); return; } static int ipc_router_send_ctl_msg( struct msm_ipc_router_xprt_info *xprt_info, union rr_control_msg *msg, uint32_t dst_node_id) { struct rr_packet *pkt; struct sk_buff *ipc_rtr_pkt; struct rr_header_v1 *hdr; int pkt_size; void *data; int ret = -EINVAL; pkt = create_pkt(NULL); if (!pkt) { IPC_RTR_ERR("%s: pkt alloc failed\n", __func__); return -ENOMEM; } pkt_size = IPC_ROUTER_HDR_SIZE + sizeof(*msg); ipc_rtr_pkt = alloc_skb(pkt_size, GFP_KERNEL); if (!ipc_rtr_pkt) { IPC_RTR_ERR("%s: ipc_rtr_pkt alloc failed\n", __func__); release_pkt(pkt); return -ENOMEM; } skb_reserve(ipc_rtr_pkt, IPC_ROUTER_HDR_SIZE); data = skb_put(ipc_rtr_pkt, sizeof(*msg)); memcpy(data, msg, sizeof(*msg)); skb_queue_tail(pkt->pkt_fragment_q, ipc_rtr_pkt); pkt->length = sizeof(*msg); hdr = &(pkt->hdr); hdr->version = IPC_ROUTER_V1; hdr->type = msg->cmd; hdr->src_node_id = IPC_ROUTER_NID_LOCAL; hdr->src_port_id = IPC_ROUTER_ADDRESS; hdr->control_flag = 0; hdr->size = sizeof(*msg); if (hdr->type == IPC_ROUTER_CTRL_CMD_RESUME_TX || (!xprt_info && dst_node_id == IPC_ROUTER_NID_LOCAL)) hdr->dst_node_id = dst_node_id; else if (xprt_info) hdr->dst_node_id = xprt_info->remote_node_id; hdr->dst_port_id = IPC_ROUTER_ADDRESS; if (dst_node_id == IPC_ROUTER_NID_LOCAL && msg->cmd != IPC_ROUTER_CTRL_CMD_RESUME_TX) { ipc_router_log_msg(local_log_ctx, IPC_ROUTER_LOG_EVENT_TX, msg, hdr, NULL, NULL); ret = post_control_ports(pkt); } else if (dst_node_id == IPC_ROUTER_NID_LOCAL && msg->cmd == IPC_ROUTER_CTRL_CMD_RESUME_TX) { ipc_router_log_msg(local_log_ctx, IPC_ROUTER_LOG_EVENT_TX, msg, hdr, NULL, NULL); ret = process_resume_tx_msg(msg, pkt); } else if (xprt_info && (msg->cmd == IPC_ROUTER_CTRL_CMD_HELLO || xprt_info->initialized)) { mutex_lock(&xprt_info->tx_lock_lhb2); ipc_router_log_msg(xprt_info->log_ctx, IPC_ROUTER_LOG_EVENT_TX, msg, hdr, NULL, NULL); ret = prepend_header(pkt, xprt_info); if (ret < 0) { mutex_unlock(&xprt_info->tx_lock_lhb2); IPC_RTR_ERR("%s: Prepend Header failed\n", __func__); release_pkt(pkt); return ret; } ret = xprt_info->xprt->write(pkt, pkt->length, xprt_info->xprt); mutex_unlock(&xprt_info->tx_lock_lhb2); } release_pkt(pkt); return ret; } static int msm_ipc_router_send_server_list(uint32_t node_id, struct msm_ipc_router_xprt_info *xprt_info) { union rr_control_msg ctl; struct msm_ipc_server *server; struct msm_ipc_server_port *server_port; int i; if (!xprt_info || !xprt_info->initialized) { IPC_RTR_ERR("%s: Xprt info not initialized\n", __func__); return -EINVAL; } memset(&ctl, 0, sizeof(ctl)); ctl.cmd = IPC_ROUTER_CTRL_CMD_NEW_SERVER; for (i = 0; i < SRV_HASH_SIZE; i++) { list_for_each_entry(server, &server_list[i], list) { ctl.srv.service = server->name.service; ctl.srv.instance = server->name.instance; list_for_each_entry(server_port, &server->server_port_list, list) { if (server_port->server_addr.node_id != node_id) continue; ctl.srv.node_id = server_port->server_addr.node_id; ctl.srv.port_id = server_port->server_addr.port_id; ipc_router_send_ctl_msg(xprt_info, &ctl, IPC_ROUTER_DUMMY_DEST_NODE); } } } return 0; } static int broadcast_ctl_msg_locally(union rr_control_msg *msg) { return ipc_router_send_ctl_msg(NULL, msg, IPC_ROUTER_NID_LOCAL); } static int broadcast_ctl_msg(union rr_control_msg *ctl) { struct msm_ipc_router_xprt_info *xprt_info; down_read(&xprt_info_list_lock_lha5); list_for_each_entry(xprt_info, &xprt_info_list, list) { ipc_router_send_ctl_msg(xprt_info, ctl, IPC_ROUTER_DUMMY_DEST_NODE); } up_read(&xprt_info_list_lock_lha5); broadcast_ctl_msg_locally(ctl); return 0; } static int relay_ctl_msg(struct msm_ipc_router_xprt_info *xprt_info, union rr_control_msg *ctl) { struct msm_ipc_router_xprt_info *fwd_xprt_info; if (!xprt_info || !ctl) return -EINVAL; down_read(&xprt_info_list_lock_lha5); list_for_each_entry(fwd_xprt_info, &xprt_info_list, list) { if (xprt_info->xprt->link_id != fwd_xprt_info->xprt->link_id) ipc_router_send_ctl_msg(fwd_xprt_info, ctl, IPC_ROUTER_DUMMY_DEST_NODE); } up_read(&xprt_info_list_lock_lha5); return 0; } static int forward_msg(struct msm_ipc_router_xprt_info *xprt_info, struct rr_packet *pkt) { struct rr_header_v1 *hdr; struct msm_ipc_router_xprt_info *fwd_xprt_info; struct msm_ipc_routing_table_entry *rt_entry; int ret = 0; int fwd_xprt_option; if (!xprt_info || !pkt) return -EINVAL; hdr = &(pkt->hdr); rt_entry = ipc_router_get_rtentry_ref(hdr->dst_node_id); if (!(rt_entry) || !(rt_entry->xprt_info)) { IPC_RTR_ERR("%s: Routing table not initialized\n", __func__); ret = -ENODEV; goto fm_error1; } down_read(&rt_entry->lock_lha4); fwd_xprt_info = rt_entry->xprt_info; ret = ipc_router_get_xprt_info_ref(fwd_xprt_info); if (ret < 0) { IPC_RTR_ERR("%s: Abort invalid xprt\n", __func__); goto fm_error_xprt; } ret = prepend_header(pkt, fwd_xprt_info); if (ret < 0) { IPC_RTR_ERR("%s: Prepend Header failed\n", __func__); goto fm_error2; } fwd_xprt_option = fwd_xprt_info->xprt->get_option(fwd_xprt_info->xprt); if (!(fwd_xprt_option & FRAG_PKT_WRITE_ENABLE)) { ret = defragment_pkt(pkt); if (ret < 0) goto fm_error2; } mutex_lock(&fwd_xprt_info->tx_lock_lhb2); if (xprt_info->remote_node_id == fwd_xprt_info->remote_node_id) { IPC_RTR_ERR("%s: Discarding Command to route back\n", __func__); ret = -EINVAL; goto fm_error3; } if (xprt_info->xprt->link_id == fwd_xprt_info->xprt->link_id) { IPC_RTR_ERR("%s: DST in the same cluster\n", __func__); ret = 0; goto fm_error3; } fwd_xprt_info->xprt->write(pkt, pkt->length, fwd_xprt_info->xprt); IPC_RTR_INFO(fwd_xprt_info->log_ctx, "%s %s Len:0x%x T:0x%x CF:0x%x SRC:<0x%x:0x%x> DST:<0x%x:0x%x>\n", "FWD", "TX", hdr->size, hdr->type, hdr->control_flag, hdr->src_node_id, hdr->src_port_id, hdr->dst_node_id, hdr->dst_port_id); fm_error3: mutex_unlock(&fwd_xprt_info->tx_lock_lhb2); fm_error2: ipc_router_put_xprt_info_ref(fwd_xprt_info); fm_error_xprt: up_read(&rt_entry->lock_lha4); fm_error1: if (rt_entry) kref_put(&rt_entry->ref, ipc_router_release_rtentry); return ret; } static int msm_ipc_router_send_remove_client(struct comm_mode_info *mode_info, uint32_t node_id, uint32_t port_id) { union rr_control_msg msg; struct msm_ipc_router_xprt_info *tmp_xprt_info; int mode; void *xprt_info; int rc = 0; if (!mode_info) { IPC_RTR_ERR("%s: NULL mode_info\n", __func__); return -EINVAL; } mode = mode_info->mode; xprt_info = mode_info->xprt_info; memset(&msg, 0, sizeof(msg)); msg.cmd = IPC_ROUTER_CTRL_CMD_REMOVE_CLIENT; msg.cli.node_id = node_id; msg.cli.port_id = port_id; if ((mode == SINGLE_LINK_MODE) && xprt_info) { down_read(&xprt_info_list_lock_lha5); list_for_each_entry(tmp_xprt_info, &xprt_info_list, list) { if (tmp_xprt_info != xprt_info) continue; ipc_router_send_ctl_msg(tmp_xprt_info, &msg, IPC_ROUTER_DUMMY_DEST_NODE); break; } up_read(&xprt_info_list_lock_lha5); } else if ((mode == SINGLE_LINK_MODE) && !xprt_info) { broadcast_ctl_msg_locally(&msg); } else if (mode == MULTI_LINK_MODE) { broadcast_ctl_msg(&msg); } else if (mode != NULL_MODE) { IPC_RTR_ERR( "%s: Invalid mode(%d) + xprt_inf(%p) for %08x:%08x\n", __func__, mode, xprt_info, node_id, port_id); rc = -EINVAL; } return rc; } static void update_comm_mode_info(struct comm_mode_info *mode_info, struct msm_ipc_router_xprt_info *xprt_info) { if (!mode_info) { IPC_RTR_ERR("%s: NULL mode_info\n", __func__); return; } if (mode_info->mode == NULL_MODE) { mode_info->xprt_info = xprt_info; mode_info->mode = SINGLE_LINK_MODE; } else if (mode_info->mode == SINGLE_LINK_MODE && mode_info->xprt_info != xprt_info) { mode_info->mode = MULTI_LINK_MODE; } return; } /** * cleanup_rmt_server() - Cleanup server hosted in the remote port * @xprt_info: XPRT through which this cleanup event is handled. * @rport_ptr: Remote port that is being cleaned up. * @server: Server that is hosted in the remote port. */ static void cleanup_rmt_server(struct msm_ipc_router_xprt_info *xprt_info, struct msm_ipc_router_remote_port *rport_ptr, struct msm_ipc_server *server) { union rr_control_msg ctl; memset(&ctl, 0, sizeof(ctl)); ctl.cmd = IPC_ROUTER_CTRL_CMD_REMOVE_SERVER; ctl.srv.service = server->name.service; ctl.srv.instance = server->name.instance; ctl.srv.node_id = rport_ptr->node_id; ctl.srv.port_id = rport_ptr->port_id; if (xprt_info) relay_ctl_msg(xprt_info, &ctl); broadcast_ctl_msg_locally(&ctl); ipc_router_destroy_server_nolock(server, rport_ptr->node_id, rport_ptr->port_id); } static void cleanup_rmt_ports(struct msm_ipc_router_xprt_info *xprt_info, struct msm_ipc_routing_table_entry *rt_entry) { struct msm_ipc_router_remote_port *rport_ptr, *tmp_rport_ptr; struct msm_ipc_server *server; union rr_control_msg ctl; int j; memset(&ctl, 0, sizeof(ctl)); for (j = 0; j < RP_HASH_SIZE; j++) { list_for_each_entry_safe(rport_ptr, tmp_rport_ptr, &rt_entry->remote_port_list[j], list) { list_del(&rport_ptr->list); mutex_lock(&rport_ptr->rport_lock_lhb2); server = rport_ptr->server; rport_ptr->server = NULL; mutex_unlock(&rport_ptr->rport_lock_lhb2); ipc_router_reset_conn(rport_ptr); if (server) { cleanup_rmt_server(xprt_info, rport_ptr, server); server = NULL; } ctl.cmd = IPC_ROUTER_CTRL_CMD_REMOVE_CLIENT; ctl.cli.node_id = rport_ptr->node_id; ctl.cli.port_id = rport_ptr->port_id; kref_put(&rport_ptr->ref, ipc_router_release_rport); relay_ctl_msg(xprt_info, &ctl); broadcast_ctl_msg_locally(&ctl); } } } static void msm_ipc_cleanup_routing_table( struct msm_ipc_router_xprt_info *xprt_info) { int i; struct msm_ipc_routing_table_entry *rt_entry, *tmp_rt_entry; if (!xprt_info) { IPC_RTR_ERR("%s: Invalid xprt_info\n", __func__); return; } down_write(&server_list_lock_lha2); down_write(&routing_table_lock_lha3); for (i = 0; i < RT_HASH_SIZE; i++) { list_for_each_entry_safe(rt_entry, tmp_rt_entry, &routing_table[i], list) { down_write(&rt_entry->lock_lha4); if (rt_entry->xprt_info != xprt_info) { up_write(&rt_entry->lock_lha4); continue; } cleanup_rmt_ports(xprt_info, rt_entry); rt_entry->xprt_info = NULL; up_write(&rt_entry->lock_lha4); list_del(&rt_entry->list); kref_put(&rt_entry->ref, ipc_router_release_rtentry); } } up_write(&routing_table_lock_lha3); up_write(&server_list_lock_lha2); } /** * sync_sec_rule() - Synchrnoize the security rule into the server structure * @server: Server structure where the rule has to be synchronized. * @rule: Security tule to be synchronized. * * This function is used to update the server structure with the security * rule configured for the corresponding to that server. */ static void sync_sec_rule(struct msm_ipc_server *server, void *rule) { struct msm_ipc_server_port *server_port; struct msm_ipc_router_remote_port *rport_ptr = NULL; list_for_each_entry(server_port, &server->server_port_list, list) { rport_ptr = ipc_router_get_rport_ref( server_port->server_addr.node_id, server_port->server_addr.port_id); if (!rport_ptr) continue; rport_ptr->sec_rule = rule; kref_put(&rport_ptr->ref, ipc_router_release_rport); } server->synced_sec_rule = 1; } /** * msm_ipc_sync_sec_rule() - Sync the security rule to the service * @service: Service for which the rule has to be synchronized. * @instance: Instance for which the rule has to be synchronized. * @rule: Security rule to be synchronized. * * This function is used to syncrhonize the security rule with the server * hash table, if the user-space script configures the rule after the service * has come up. This function is used to synchronize the security rule to a * specific service and optionally a specific instance. */ void msm_ipc_sync_sec_rule(uint32_t service, uint32_t instance, void *rule) { int key = (service & (SRV_HASH_SIZE - 1)); struct msm_ipc_server *server; down_write(&server_list_lock_lha2); list_for_each_entry(server, &server_list[key], list) { if (server->name.service != service) continue; if (server->name.instance != instance && instance != ALL_INSTANCE) continue; /* If the rule applies to all instances and if the specific * instance of a service has a rule synchronized already, * do not apply the rule for that specific instance. */ if (instance == ALL_INSTANCE && server->synced_sec_rule) continue; sync_sec_rule(server, rule); } up_write(&server_list_lock_lha2); } /** * msm_ipc_sync_default_sec_rule() - Default security rule to all services * @rule: Security rule to be synchronized. * * This function is used to syncrhonize the security rule with the server * hash table, if the user-space script configures the rule after the service * has come up. This function is used to synchronize the security rule that * applies to all services, if the concerned service do not have any rule * defined. */ void msm_ipc_sync_default_sec_rule(void *rule) { int key; struct msm_ipc_server *server; down_write(&server_list_lock_lha2); for (key = 0; key < SRV_HASH_SIZE; key++) { list_for_each_entry(server, &server_list[key], list) { if (server->synced_sec_rule) continue; sync_sec_rule(server, rule); } } up_write(&server_list_lock_lha2); } /** * ipc_router_reset_conn() - Reset the connection to remote port * @rport_ptr: Pointer to the remote port to be disconnected. * * This function is used to reset all the local ports that are connected to * the remote port being passed. */ static void ipc_router_reset_conn(struct msm_ipc_router_remote_port *rport_ptr) { struct msm_ipc_port *port_ptr; struct ipc_router_conn_info *conn_info, *tmp_conn_info; mutex_lock(&rport_ptr->rport_lock_lhb2); list_for_each_entry_safe(conn_info, tmp_conn_info, &rport_ptr->conn_info_list, list) { port_ptr = ipc_router_get_port_ref(conn_info->port_id); if (port_ptr) { mutex_lock(&port_ptr->port_lock_lhc3); port_ptr->conn_status = CONNECTION_RESET; mutex_unlock(&port_ptr->port_lock_lhc3); wake_up(&port_ptr->port_rx_wait_q); kref_put(&port_ptr->ref, ipc_router_release_port); } list_del(&conn_info->list); kfree(conn_info); } mutex_unlock(&rport_ptr->rport_lock_lhb2); } /** * ipc_router_set_conn() - Set the connection by initializing dest address * @port_ptr: Local port in which the connection has to be set. * @addr: Destination address of the connection. * * @return: 0 on success, standard Linux error codes on failure. */ int ipc_router_set_conn(struct msm_ipc_port *port_ptr, struct msm_ipc_addr *addr) { struct msm_ipc_router_remote_port *rport_ptr; struct ipc_router_conn_info *conn_info; if (unlikely(!port_ptr || !addr)) return -EINVAL; if (addr->addrtype != MSM_IPC_ADDR_ID) { IPC_RTR_ERR("%s: Invalid Address type\n", __func__); return -EINVAL; } if (port_ptr->type == SERVER_PORT) { IPC_RTR_ERR("%s: Connection refused on a server port\n", __func__); return -ECONNREFUSED; } if (port_ptr->conn_status == CONNECTED) { IPC_RTR_ERR("%s: Port %08x already connected\n", __func__, port_ptr->this_port.port_id); return -EISCONN; } conn_info = kzalloc(sizeof(struct ipc_router_conn_info), GFP_KERNEL); if (!conn_info) { IPC_RTR_ERR("%s: Error allocating conn_info\n", __func__); return -ENOMEM; } INIT_LIST_HEAD(&conn_info->list); conn_info->port_id = port_ptr->this_port.port_id; rport_ptr = ipc_router_get_rport_ref(addr->addr.port_addr.node_id, addr->addr.port_addr.port_id); if (!rport_ptr) { IPC_RTR_ERR("%s: Invalid remote endpoint\n", __func__); kfree(conn_info); return -ENODEV; } mutex_lock(&rport_ptr->rport_lock_lhb2); list_add_tail(&conn_info->list, &rport_ptr->conn_info_list); mutex_unlock(&rport_ptr->rport_lock_lhb2); mutex_lock(&port_ptr->port_lock_lhc3); memcpy(&port_ptr->dest_addr, &addr->addr.port_addr, sizeof(struct msm_ipc_port_addr)); port_ptr->conn_status = CONNECTED; mutex_unlock(&port_ptr->port_lock_lhc3); kref_put(&rport_ptr->ref, ipc_router_release_rport); return 0; } /** * do_version_negotiation() - perform a version negotiation and set the version * @xprt_info: Pointer to the IPC Router transport info structure. * @msg: Pointer to the IPC Router HELLO message. * * This function performs the version negotiation by verifying the computed * checksum first. If the checksum matches with the magic number, it sets the * negotiated IPC Router version in transport. */ static void do_version_negotiation(struct msm_ipc_router_xprt_info *xprt_info, union rr_control_msg *msg) { uint32_t magic; unsigned version; if (!xprt_info) return; magic = ipc_router_calc_checksum(msg); if (magic == IPC_ROUTER_HELLO_MAGIC) { version = fls(msg->hello.versions & IPC_ROUTER_VER_BITMASK) - 1; /*Bit 0 & 31 are reserved for future usage*/ if ((version > 0) && (version != (sizeof(version) * BITS_PER_BYTE - 1)) && xprt_info->xprt->set_version) xprt_info->xprt->set_version(xprt_info->xprt, version); } } static int send_hello_msg(struct msm_ipc_router_xprt_info *xprt_info) { int rc = 0; union rr_control_msg ctl; if (xprt_info->hello_sent) return 0; xprt_info->hello_sent = 1; /* Send a HELLO message */ memset(&ctl, 0, sizeof(ctl)); ctl.hello.cmd = IPC_ROUTER_CTRL_CMD_HELLO; ctl.hello.checksum = IPC_ROUTER_HELLO_MAGIC; ctl.hello.versions = (uint32_t)IPC_ROUTER_VER_BITMASK; ctl.hello.checksum = ipc_router_calc_checksum(&ctl); rc = ipc_router_send_ctl_msg(xprt_info, &ctl, IPC_ROUTER_DUMMY_DEST_NODE); if (rc < 0) { xprt_info->hello_sent = 0; IPC_RTR_ERR("%s: Error sending HELLO message\n", __func__); return rc; } return rc; } static int process_hello_msg(struct msm_ipc_router_xprt_info *xprt_info, union rr_control_msg *msg, struct rr_header_v1 *hdr) { int i, rc = 0; struct msm_ipc_routing_table_entry *rt_entry; if (!hdr) return -EINVAL; xprt_info->remote_node_id = hdr->src_node_id; rt_entry = create_routing_table_entry(hdr->src_node_id, xprt_info); if (!rt_entry) { IPC_RTR_ERR("%s: rt_entry allocation failed\n", __func__); return -ENOMEM; } kref_put(&rt_entry->ref, ipc_router_release_rtentry); do_version_negotiation(xprt_info, msg); rc = send_hello_msg(xprt_info); if (rc < 0) return rc; xprt_info->initialized = 1; /* Send list of servers from the local node and from nodes * outside the mesh network in which this XPRT is part of. */ down_read(&server_list_lock_lha2); down_read(&routing_table_lock_lha3); for (i = 0; i < RT_HASH_SIZE; i++) { list_for_each_entry(rt_entry, &routing_table[i], list) { if ((rt_entry->node_id != IPC_ROUTER_NID_LOCAL) && (!rt_entry->xprt_info || (rt_entry->xprt_info->xprt->link_id == xprt_info->xprt->link_id))) continue; rc = msm_ipc_router_send_server_list(rt_entry->node_id, xprt_info); if (rc < 0) { up_read(&routing_table_lock_lha3); up_read(&server_list_lock_lha2); return rc; } } } up_read(&routing_table_lock_lha3); up_read(&server_list_lock_lha2); return rc; } static int process_resume_tx_msg(union rr_control_msg *msg, struct rr_packet *pkt) { struct msm_ipc_router_remote_port *rport_ptr; rport_ptr = ipc_router_get_rport_ref(msg->cli.node_id, msg->cli.port_id); if (!rport_ptr) { IPC_RTR_ERR("%s: Unable to resume client\n", __func__); return -ENODEV; } mutex_lock(&rport_ptr->rport_lock_lhb2); rport_ptr->tx_quota_cnt = 0; post_resume_tx(rport_ptr, pkt, msg); mutex_unlock(&rport_ptr->rport_lock_lhb2); kref_put(&rport_ptr->ref, ipc_router_release_rport); return 0; } static int process_new_server_msg(struct msm_ipc_router_xprt_info *xprt_info, union rr_control_msg *msg, struct rr_packet *pkt) { struct msm_ipc_routing_table_entry *rt_entry; struct msm_ipc_server *server; struct msm_ipc_router_remote_port *rport_ptr; if (msg->srv.instance == 0) { IPC_RTR_ERR("%s: Server %08x create rejected, version = 0\n", __func__, msg->srv.service); return -EINVAL; } rt_entry = ipc_router_get_rtentry_ref(msg->srv.node_id); if (!rt_entry) { rt_entry = create_routing_table_entry(msg->srv.node_id, xprt_info); if (!rt_entry) { IPC_RTR_ERR("%s: rt_entry allocation failed\n", __func__); return -ENOMEM; } } kref_put(&rt_entry->ref, ipc_router_release_rtentry); /* If the service already exists in the table, create_server returns * a reference to it. */ rport_ptr = ipc_router_create_rport(msg->srv.node_id, msg->srv.port_id, xprt_info); if (!rport_ptr) return -ENOMEM; server = msm_ipc_router_create_server( msg->srv.service, msg->srv.instance, msg->srv.node_id, msg->srv.port_id, xprt_info); if (!server) { IPC_RTR_ERR("%s: Server %08x:%08x Create failed\n", __func__, msg->srv.service, msg->srv.instance); kref_put(&rport_ptr->ref, ipc_router_release_rport); ipc_router_destroy_rport(rport_ptr); return -ENOMEM; } mutex_lock(&rport_ptr->rport_lock_lhb2); rport_ptr->server = server; mutex_unlock(&rport_ptr->rport_lock_lhb2); rport_ptr->sec_rule = msm_ipc_get_security_rule( msg->srv.service, msg->srv.instance); kref_put(&rport_ptr->ref, ipc_router_release_rport); kref_put(&server->ref, ipc_router_release_server); /* Relay the new server message to other subsystems that do not belong * to the cluster from which this message is received. Notify the * local clients waiting for this service. */ relay_ctl_msg(xprt_info, msg); post_control_ports(pkt); return 0; } static int process_rmv_server_msg(struct msm_ipc_router_xprt_info *xprt_info, union rr_control_msg *msg, struct rr_packet *pkt) { struct msm_ipc_server *server; struct msm_ipc_router_remote_port *rport_ptr; server = ipc_router_get_server_ref(msg->srv.service, msg->srv.instance, msg->srv.node_id, msg->srv.port_id); rport_ptr = ipc_router_get_rport_ref(msg->srv.node_id, msg->srv.port_id); if (rport_ptr) { mutex_lock(&rport_ptr->rport_lock_lhb2); if (rport_ptr->server == server) rport_ptr->server = NULL; mutex_unlock(&rport_ptr->rport_lock_lhb2); kref_put(&rport_ptr->ref, ipc_router_release_rport); } if (server) { kref_put(&server->ref, ipc_router_release_server); ipc_router_destroy_server(server, msg->srv.node_id, msg->srv.port_id); /* * Relay the new server message to other subsystems that do not * belong to the cluster from which this message is received. * Notify the local clients communicating with the service. */ relay_ctl_msg(xprt_info, msg); post_control_ports(pkt); } return 0; } static int process_rmv_client_msg(struct msm_ipc_router_xprt_info *xprt_info, union rr_control_msg *msg, struct rr_packet *pkt) { struct msm_ipc_router_remote_port *rport_ptr; struct msm_ipc_server *server; rport_ptr = ipc_router_get_rport_ref(msg->cli.node_id, msg->cli.port_id); if (rport_ptr) { mutex_lock(&rport_ptr->rport_lock_lhb2); server = rport_ptr->server; rport_ptr->server = NULL; mutex_unlock(&rport_ptr->rport_lock_lhb2); ipc_router_reset_conn(rport_ptr); down_write(&server_list_lock_lha2); if (server) cleanup_rmt_server(NULL, rport_ptr, server); up_write(&server_list_lock_lha2); kref_put(&rport_ptr->ref, ipc_router_release_rport); ipc_router_destroy_rport(rport_ptr); } relay_ctl_msg(xprt_info, msg); post_control_ports(pkt); return 0; } static int process_control_msg(struct msm_ipc_router_xprt_info *xprt_info, struct rr_packet *pkt) { union rr_control_msg *msg; int rc = 0; struct rr_header_v1 *hdr; if (pkt->length != sizeof(*msg)) { IPC_RTR_ERR("%s: r2r msg size %d != %zu\n", __func__, pkt->length, sizeof(*msg)); return -EINVAL; } hdr = &(pkt->hdr); msg = msm_ipc_router_skb_to_buf(pkt->pkt_fragment_q, sizeof(*msg)); if (!msg) { IPC_RTR_ERR("%s: Error extracting control msg\n", __func__); return -ENOMEM; } ipc_router_log_msg(xprt_info->log_ctx, IPC_ROUTER_LOG_EVENT_RX, msg, hdr, NULL, NULL); switch (msg->cmd) { case IPC_ROUTER_CTRL_CMD_HELLO: rc = process_hello_msg(xprt_info, msg, hdr); break; case IPC_ROUTER_CTRL_CMD_RESUME_TX: rc = process_resume_tx_msg(msg, pkt); break; case IPC_ROUTER_CTRL_CMD_NEW_SERVER: rc = process_new_server_msg(xprt_info, msg, pkt); break; case IPC_ROUTER_CTRL_CMD_REMOVE_SERVER: rc = process_rmv_server_msg(xprt_info, msg, pkt); break; case IPC_ROUTER_CTRL_CMD_REMOVE_CLIENT: rc = process_rmv_client_msg(xprt_info, msg, pkt); break; default: rc = -ENOSYS; } kfree(msg); return rc; } static void do_read_data(struct work_struct *work) { struct rr_header_v1 *hdr; struct rr_packet *pkt = NULL; struct msm_ipc_port *port_ptr; struct msm_ipc_router_remote_port *rport_ptr; struct msm_ipc_router_xprt_info *xprt_info = container_of(work, struct msm_ipc_router_xprt_info, read_data); while ((pkt = rr_read(xprt_info)) != NULL) { hdr = &(pkt->hdr); if ((hdr->dst_node_id != IPC_ROUTER_NID_LOCAL) && ((hdr->type == IPC_ROUTER_CTRL_CMD_RESUME_TX) || (hdr->type == IPC_ROUTER_CTRL_CMD_DATA))) { IPC_RTR_INFO(xprt_info->log_ctx, "%s %s Len:0x%x T:0x%x CF:0x%x SRC:<0x%x:0x%x> DST:<0x%x:0x%x>\n", "FWD", "RX", hdr->size, hdr->type, hdr->control_flag, hdr->src_node_id, hdr->src_port_id, hdr->dst_node_id, hdr->dst_port_id); forward_msg(xprt_info, pkt); goto read_next_pkt1; } if (hdr->type != IPC_ROUTER_CTRL_CMD_DATA) { process_control_msg(xprt_info, pkt); goto read_next_pkt1; } if (msm_ipc_router_debug_mask & SMEM_LOG) { smem_log_event((SMEM_LOG_PROC_ID_APPS | SMEM_LOG_IPC_ROUTER_EVENT_BASE | IPC_ROUTER_LOG_EVENT_RX), (hdr->src_node_id << 24) | (hdr->src_port_id & 0xffffff), (hdr->dst_node_id << 24) | (hdr->dst_port_id & 0xffffff), (hdr->type << 24) | (hdr->control_flag << 16) | (hdr->size & 0xffff)); } port_ptr = ipc_router_get_port_ref(hdr->dst_port_id); if (!port_ptr) { IPC_RTR_ERR("%s: No local port id %08x\n", __func__, hdr->dst_port_id); goto read_next_pkt1; } rport_ptr = ipc_router_get_rport_ref(hdr->src_node_id, hdr->src_port_id); if (!rport_ptr) { rport_ptr = ipc_router_create_rport(hdr->src_node_id, hdr->src_port_id, xprt_info); if (!rport_ptr) { IPC_RTR_ERR( "%s: Rmt Prt %08x:%08x create failed\n", __func__, hdr->src_node_id, hdr->src_port_id); goto read_next_pkt2; } } ipc_router_log_msg(xprt_info->log_ctx, IPC_ROUTER_LOG_EVENT_RX, pkt, hdr, port_ptr, rport_ptr); kref_put(&rport_ptr->ref, ipc_router_release_rport); post_pkt_to_port(port_ptr, pkt, 0); kref_put(&port_ptr->ref, ipc_router_release_port); continue; read_next_pkt2: kref_put(&port_ptr->ref, ipc_router_release_port); read_next_pkt1: release_pkt(pkt); } } int msm_ipc_router_register_server(struct msm_ipc_port *port_ptr, struct msm_ipc_addr *name) { struct msm_ipc_server *server; union rr_control_msg ctl; struct msm_ipc_router_remote_port *rport_ptr; if (!port_ptr || !name) return -EINVAL; if (port_ptr->type != CLIENT_PORT) return -EINVAL; if (name->addrtype != MSM_IPC_ADDR_NAME) return -EINVAL; rport_ptr = ipc_router_create_rport(IPC_ROUTER_NID_LOCAL, port_ptr->this_port.port_id, NULL); if (!rport_ptr) { IPC_RTR_ERR("%s: RPort %08x:%08x creation failed\n", __func__, IPC_ROUTER_NID_LOCAL, port_ptr->this_port.port_id); return -ENOMEM; } server = msm_ipc_router_create_server(name->addr.port_name.service, name->addr.port_name.instance, IPC_ROUTER_NID_LOCAL, port_ptr->this_port.port_id, NULL); if (!server) { IPC_RTR_ERR("%s: Server %08x:%08x Create failed\n", __func__, name->addr.port_name.service, name->addr.port_name.instance); kref_put(&rport_ptr->ref, ipc_router_release_rport); ipc_router_destroy_rport(rport_ptr); return -ENOMEM; } memset(&ctl, 0, sizeof(ctl)); ctl.cmd = IPC_ROUTER_CTRL_CMD_NEW_SERVER; ctl.srv.service = server->name.service; ctl.srv.instance = server->name.instance; ctl.srv.node_id = IPC_ROUTER_NID_LOCAL; ctl.srv.port_id = port_ptr->this_port.port_id; broadcast_ctl_msg(&ctl); mutex_lock(&port_ptr->port_lock_lhc3); port_ptr->type = SERVER_PORT; port_ptr->mode_info.mode = MULTI_LINK_MODE; port_ptr->port_name.service = server->name.service; port_ptr->port_name.instance = server->name.instance; port_ptr->rport_info = rport_ptr; mutex_unlock(&port_ptr->port_lock_lhc3); kref_put(&rport_ptr->ref, ipc_router_release_rport); kref_put(&server->ref, ipc_router_release_server); return 0; } int msm_ipc_router_unregister_server(struct msm_ipc_port *port_ptr) { struct msm_ipc_server *server; union rr_control_msg ctl; struct msm_ipc_router_remote_port *rport_ptr; if (!port_ptr) return -EINVAL; if (port_ptr->type != SERVER_PORT) { IPC_RTR_ERR("%s: Trying to unregister a non-server port\n", __func__); return -EINVAL; } if (port_ptr->this_port.node_id != IPC_ROUTER_NID_LOCAL) { IPC_RTR_ERR( "%s: Trying to unregister a remote server locally\n", __func__); return -EINVAL; } server = ipc_router_get_server_ref(port_ptr->port_name.service, port_ptr->port_name.instance, port_ptr->this_port.node_id, port_ptr->this_port.port_id); if (!server) { IPC_RTR_ERR("%s: Server lookup failed\n", __func__); return -ENODEV; } mutex_lock(&port_ptr->port_lock_lhc3); port_ptr->type = CLIENT_PORT; rport_ptr = (struct msm_ipc_router_remote_port *)port_ptr->rport_info; mutex_unlock(&port_ptr->port_lock_lhc3); if (rport_ptr) ipc_router_reset_conn(rport_ptr); memset(&ctl, 0, sizeof(ctl)); ctl.cmd = IPC_ROUTER_CTRL_CMD_REMOVE_SERVER; ctl.srv.service = server->name.service; ctl.srv.instance = server->name.instance; ctl.srv.node_id = IPC_ROUTER_NID_LOCAL; ctl.srv.port_id = port_ptr->this_port.port_id; kref_put(&server->ref, ipc_router_release_server); ipc_router_destroy_server(server, port_ptr->this_port.node_id, port_ptr->this_port.port_id); broadcast_ctl_msg(&ctl); mutex_lock(&port_ptr->port_lock_lhc3); port_ptr->type = CLIENT_PORT; mutex_unlock(&port_ptr->port_lock_lhc3); return 0; } static int loopback_data(struct msm_ipc_port *src, uint32_t port_id, struct rr_packet *pkt) { struct msm_ipc_port *port_ptr; struct sk_buff *temp_skb; int align_size; if (!pkt) { IPC_RTR_ERR("%s: Invalid pkt pointer\n", __func__); return -EINVAL; } temp_skb = skb_peek_tail(pkt->pkt_fragment_q); if (!temp_skb) { IPC_RTR_ERR("%s: Empty skb\n", __func__); return -EINVAL; } align_size = ALIGN_SIZE(pkt->length); skb_put(temp_skb, align_size); pkt->length += align_size; port_ptr = ipc_router_get_port_ref(port_id); if (!port_ptr) { IPC_RTR_ERR("%s: Local port %d not present\n", __func__, port_id); return -ENODEV; } post_pkt_to_port(port_ptr, pkt, 1); update_comm_mode_info(&src->mode_info, NULL); kref_put(&port_ptr->ref, ipc_router_release_port); return pkt->hdr.size; } static int ipc_router_tx_wait(struct msm_ipc_port *src, struct msm_ipc_router_remote_port *rport_ptr, uint32_t *set_confirm_rx, long timeout) { struct msm_ipc_resume_tx_port *resume_tx_port; int ret; if (unlikely(!src || !rport_ptr)) return -EINVAL; for (;;) { mutex_lock(&rport_ptr->rport_lock_lhb2); if (rport_ptr->status == RESET) { mutex_unlock(&rport_ptr->rport_lock_lhb2); IPC_RTR_ERR("%s: RPort %08x:%08x is in reset state\n", __func__, rport_ptr->node_id, rport_ptr->port_id); return -ENETRESET; } if (rport_ptr->tx_quota_cnt < IPC_ROUTER_HIGH_RX_QUOTA) break; if (msm_ipc_router_lookup_resume_tx_port( rport_ptr, src->this_port.port_id)) goto check_timeo; resume_tx_port = kzalloc(sizeof(struct msm_ipc_resume_tx_port), GFP_KERNEL); if (!resume_tx_port) { IPC_RTR_ERR("%s: Resume_Tx port allocation failed\n", __func__); mutex_unlock(&rport_ptr->rport_lock_lhb2); return -ENOMEM; } INIT_LIST_HEAD(&resume_tx_port->list); resume_tx_port->port_id = src->this_port.port_id; resume_tx_port->node_id = src->this_port.node_id; list_add_tail(&resume_tx_port->list, &rport_ptr->resume_tx_port_list); check_timeo: mutex_unlock(&rport_ptr->rport_lock_lhb2); if (!timeout) { return -EAGAIN; } else if (timeout < 0) { ret = wait_event_interruptible(src->port_tx_wait_q, (rport_ptr->tx_quota_cnt != IPC_ROUTER_HIGH_RX_QUOTA || rport_ptr->status == RESET)); if (ret) return ret; } else { ret = wait_event_interruptible_timeout( src->port_tx_wait_q, (rport_ptr->tx_quota_cnt != IPC_ROUTER_HIGH_RX_QUOTA || rport_ptr->status == RESET), msecs_to_jiffies(timeout)); if (ret < 0) { return ret; } else if (ret == 0) { IPC_RTR_ERR("%s: Resume_tx Timeout %08x:%08x\n", __func__, rport_ptr->node_id, rport_ptr->port_id); return -ETIMEDOUT; } } } rport_ptr->tx_quota_cnt++; if (rport_ptr->tx_quota_cnt == IPC_ROUTER_LOW_RX_QUOTA) *set_confirm_rx = 1; mutex_unlock(&rport_ptr->rport_lock_lhb2); return 0; } static int msm_ipc_router_write_pkt(struct msm_ipc_port *src, struct msm_ipc_router_remote_port *rport_ptr, struct rr_packet *pkt, long timeout) { struct rr_header_v1 *hdr; struct msm_ipc_router_xprt_info *xprt_info; struct msm_ipc_routing_table_entry *rt_entry; struct sk_buff *temp_skb; int xprt_option; int ret; int align_size; uint32_t set_confirm_rx = 0; if (!rport_ptr || !src || !pkt) return -EINVAL; hdr = &(pkt->hdr); hdr->version = IPC_ROUTER_V1; hdr->type = IPC_ROUTER_CTRL_CMD_DATA; hdr->src_node_id = src->this_port.node_id; hdr->src_port_id = src->this_port.port_id; hdr->size = pkt->length; hdr->control_flag = 0; hdr->dst_node_id = rport_ptr->node_id; hdr->dst_port_id = rport_ptr->port_id; ret = ipc_router_tx_wait(src, rport_ptr, &set_confirm_rx, timeout); if (ret < 0) return ret; if (set_confirm_rx) hdr->control_flag |= CONTROL_FLAG_CONFIRM_RX; if (hdr->dst_node_id == IPC_ROUTER_NID_LOCAL) { ipc_router_log_msg(local_log_ctx, IPC_ROUTER_LOG_EVENT_TX, pkt, hdr, src, rport_ptr); ret = loopback_data(src, hdr->dst_port_id, pkt); return ret; } rt_entry = ipc_router_get_rtentry_ref(hdr->dst_node_id); if (!rt_entry) { IPC_RTR_ERR("%s: Remote node %d not up\n", __func__, hdr->dst_node_id); return -ENODEV; } down_read(&rt_entry->lock_lha4); xprt_info = rt_entry->xprt_info; ret = ipc_router_get_xprt_info_ref(xprt_info); if (ret < 0) { IPC_RTR_ERR("%s: Abort invalid xprt\n", __func__); up_read(&rt_entry->lock_lha4); kref_put(&rt_entry->ref, ipc_router_release_rtentry); return ret; } ret = prepend_header(pkt, xprt_info); if (ret < 0) { IPC_RTR_ERR("%s: Prepend Header failed\n", __func__); goto out_write_pkt; } xprt_option = xprt_info->xprt->get_option(xprt_info->xprt); if (!(xprt_option & FRAG_PKT_WRITE_ENABLE)) { ret = defragment_pkt(pkt); if (ret < 0) goto out_write_pkt; } temp_skb = skb_peek_tail(pkt->pkt_fragment_q); if (!temp_skb) { IPC_RTR_ERR("%s: Abort invalid pkt\n", __func__); ret = -EINVAL; goto out_write_pkt; } align_size = ALIGN_SIZE(pkt->length); skb_put(temp_skb, align_size); pkt->length += align_size; mutex_lock(&xprt_info->tx_lock_lhb2); ret = xprt_info->xprt->write(pkt, pkt->length, xprt_info->xprt); mutex_unlock(&xprt_info->tx_lock_lhb2); out_write_pkt: up_read(&rt_entry->lock_lha4); kref_put(&rt_entry->ref, ipc_router_release_rtentry); if (ret < 0) { IPC_RTR_ERR("%s: Write on XPRT failed\n", __func__); ipc_router_log_msg(xprt_info->log_ctx, IPC_ROUTER_LOG_EVENT_TX_ERR, pkt, hdr, src, rport_ptr); ipc_router_put_xprt_info_ref(xprt_info); return ret; } update_comm_mode_info(&src->mode_info, xprt_info); ipc_router_log_msg(xprt_info->log_ctx, IPC_ROUTER_LOG_EVENT_TX, pkt, hdr, src, rport_ptr); if (msm_ipc_router_debug_mask & SMEM_LOG) { smem_log_event((SMEM_LOG_PROC_ID_APPS | SMEM_LOG_IPC_ROUTER_EVENT_BASE | IPC_ROUTER_LOG_EVENT_TX), (hdr->src_node_id << 24) | (hdr->src_port_id & 0xffffff), (hdr->dst_node_id << 24) | (hdr->dst_port_id & 0xffffff), (hdr->type << 24) | (hdr->control_flag << 16) | (hdr->size & 0xffff)); } ipc_router_put_xprt_info_ref(xprt_info); return hdr->size; } int msm_ipc_router_send_to(struct msm_ipc_port *src, struct sk_buff_head *data, struct msm_ipc_addr *dest, long timeout) { uint32_t dst_node_id = 0, dst_port_id = 0; struct msm_ipc_server *server; struct msm_ipc_server_port *server_port; struct msm_ipc_router_remote_port *rport_ptr = NULL; struct msm_ipc_router_remote_port *src_rport_ptr = NULL; struct rr_packet *pkt; int ret; if (!src || !data || !dest) { IPC_RTR_ERR("%s: Invalid Parameters\n", __func__); return -EINVAL; } /* Resolve Address*/ if (dest->addrtype == MSM_IPC_ADDR_ID) { dst_node_id = dest->addr.port_addr.node_id; dst_port_id = dest->addr.port_addr.port_id; } else if (dest->addrtype == MSM_IPC_ADDR_NAME) { server = ipc_router_get_server_ref( dest->addr.port_name.service, dest->addr.port_name.instance, 0, 0); if (!server) { IPC_RTR_ERR("%s: Destination not reachable\n", __func__); return -ENODEV; } server_port = list_first_entry(&server->server_port_list, struct msm_ipc_server_port, list); dst_node_id = server_port->server_addr.node_id; dst_port_id = server_port->server_addr.port_id; kref_put(&server->ref, ipc_router_release_server); } rport_ptr = ipc_router_get_rport_ref(dst_node_id, dst_port_id); if (!rport_ptr) { IPC_RTR_ERR("%s: Remote port not found\n", __func__); return -ENODEV; } if (src->check_send_permissions) { ret = src->check_send_permissions(rport_ptr->sec_rule); if (ret <= 0) { kref_put(&rport_ptr->ref, ipc_router_release_rport); IPC_RTR_ERR("%s: permission failure for %s\n", __func__, current->comm); return -EPERM; } } if (dst_node_id == IPC_ROUTER_NID_LOCAL && !src->rport_info) { src_rport_ptr = ipc_router_create_rport(IPC_ROUTER_NID_LOCAL, src->this_port.port_id, NULL); if (!src_rport_ptr) { kref_put(&rport_ptr->ref, ipc_router_release_rport); IPC_RTR_ERR("%s: RPort creation failed\n", __func__); return -ENOMEM; } mutex_lock(&src->port_lock_lhc3); src->rport_info = src_rport_ptr; mutex_unlock(&src->port_lock_lhc3); kref_put(&src_rport_ptr->ref, ipc_router_release_rport); } pkt = create_pkt(data); if (!pkt) { kref_put(&rport_ptr->ref, ipc_router_release_rport); IPC_RTR_ERR("%s: Pkt creation failed\n", __func__); return -ENOMEM; } ret = msm_ipc_router_write_pkt(src, rport_ptr, pkt, timeout); kref_put(&rport_ptr->ref, ipc_router_release_rport); if (ret < 0) pkt->pkt_fragment_q = NULL; release_pkt(pkt); return ret; } int msm_ipc_router_send_msg(struct msm_ipc_port *src, struct msm_ipc_addr *dest, void *data, unsigned int data_len) { struct sk_buff_head *out_skb_head; int ret; out_skb_head = msm_ipc_router_buf_to_skb(data, data_len); if (!out_skb_head) { IPC_RTR_ERR("%s: SKB conversion failed\n", __func__); return -EFAULT; } ret = msm_ipc_router_send_to(src, out_skb_head, dest, 0); if (ret < 0) { if (ret != -EAGAIN) IPC_RTR_ERR( "%s: msm_ipc_router_send_to failed - ret: %d\n", __func__, ret); msm_ipc_router_free_skb(out_skb_head); return ret; } return 0; } /** * msm_ipc_router_send_resume_tx() - Send Resume_Tx message * @data: Pointer to received data packet that has confirm_rx bit set * * @return: On success, number of bytes transferred is returned, else * standard linux error code is returned. * * This function sends the Resume_Tx event to the remote node that * sent the data with confirm_rx field set. In case of a multi-hop * scenario also, this function makes sure that the destination node_id * to which the resume_tx event should reach is right. */ static int msm_ipc_router_send_resume_tx(void *data) { union rr_control_msg msg; struct rr_header_v1 *hdr = (struct rr_header_v1 *)data; struct msm_ipc_routing_table_entry *rt_entry; int ret; memset(&msg, 0, sizeof(msg)); msg.cmd = IPC_ROUTER_CTRL_CMD_RESUME_TX; msg.cli.node_id = hdr->dst_node_id; msg.cli.port_id = hdr->dst_port_id; rt_entry = ipc_router_get_rtentry_ref(hdr->src_node_id); if (!rt_entry) { IPC_RTR_ERR("%s: %d Node is not present", __func__, hdr->src_node_id); return -ENODEV; } ret = ipc_router_get_xprt_info_ref(rt_entry->xprt_info); if (ret < 0) { IPC_RTR_ERR("%s: Abort invalid xprt\n", __func__); kref_put(&rt_entry->ref, ipc_router_release_rtentry); return ret; } ret = ipc_router_send_ctl_msg(rt_entry->xprt_info, &msg, hdr->src_node_id); ipc_router_put_xprt_info_ref(rt_entry->xprt_info); kref_put(&rt_entry->ref, ipc_router_release_rtentry); if (ret < 0) IPC_RTR_ERR( "%s: Send Resume_Tx Failed SRC_NODE: %d SRC_PORT: %d DEST_NODE: %d", __func__, hdr->dst_node_id, hdr->dst_port_id, hdr->src_node_id); return ret; } int msm_ipc_router_read(struct msm_ipc_port *port_ptr, struct rr_packet **read_pkt, size_t buf_len) { struct rr_packet *pkt; if (!port_ptr || !read_pkt) return -EINVAL; mutex_lock(&port_ptr->port_rx_q_lock_lhc3); if (list_empty(&port_ptr->port_rx_q)) { mutex_unlock(&port_ptr->port_rx_q_lock_lhc3); return -EAGAIN; } pkt = list_first_entry(&port_ptr->port_rx_q, struct rr_packet, list); if ((buf_len) && (pkt->hdr.size > buf_len)) { mutex_unlock(&port_ptr->port_rx_q_lock_lhc3); return -ETOOSMALL; } list_del(&pkt->list); if (list_empty(&port_ptr->port_rx_q)) __pm_relax(port_ptr->port_rx_ws); *read_pkt = pkt; mutex_unlock(&port_ptr->port_rx_q_lock_lhc3); if (pkt->hdr.control_flag & CONTROL_FLAG_CONFIRM_RX) msm_ipc_router_send_resume_tx(&pkt->hdr); return pkt->length; } /** * msm_ipc_router_rx_data_wait() - Wait for new message destined to a local port. * @port_ptr: Pointer to the local port * @timeout: < 0 timeout indicates infinite wait till a message arrives. * > 0 timeout indicates the wait time. * 0 indicates that we do not wait. * @return: 0 if there are pending messages to read, * standard Linux error code otherwise. * * Checks for the availability of messages that are destined to a local port. * If no messages are present then waits as per @timeout. */ int msm_ipc_router_rx_data_wait(struct msm_ipc_port *port_ptr, long timeout) { int ret = 0; mutex_lock(&port_ptr->port_rx_q_lock_lhc3); while (list_empty(&port_ptr->port_rx_q)) { mutex_unlock(&port_ptr->port_rx_q_lock_lhc3); if (timeout < 0) { ret = wait_event_interruptible( port_ptr->port_rx_wait_q, !list_empty(&port_ptr->port_rx_q)); if (ret) return ret; } else if (timeout > 0) { timeout = wait_event_interruptible_timeout( port_ptr->port_rx_wait_q, !list_empty(&port_ptr->port_rx_q), timeout); if (timeout < 0) return -EFAULT; } if (timeout == 0) return -ENOMSG; mutex_lock(&port_ptr->port_rx_q_lock_lhc3); } mutex_unlock(&port_ptr->port_rx_q_lock_lhc3); return ret; } /** * msm_ipc_router_recv_from() - Recieve messages destined to a local port. * @port_ptr: Pointer to the local port * @pkt : Pointer to the router-to-router packet * @src: Pointer to local port address * @timeout: < 0 timeout indicates infinite wait till a message arrives. * > 0 timeout indicates the wait time. * 0 indicates that we do not wait. * @return: = Number of bytes read(On successful read operation). * = -ENOMSG (If there are no pending messages and timeout is 0). * = -EINVAL (If either of the arguments, port_ptr or data is invalid) * = -EFAULT (If there are no pending messages when timeout is > 0 * and the wait_event_interruptible_timeout has returned value > 0) * = -ERESTARTSYS (If there are no pending messages when timeout * is < 0 and wait_event_interruptible was interrupted by a signal) * * This function reads the messages that are destined for a local port. It * is used by modules that exist with-in the kernel and use IPC Router for * transport. The function checks if there are any messages that are already * received. If yes, it reads them, else it waits as per the timeout value. * On a successful read, the return value of the function indicates the number * of bytes that are read. */ int msm_ipc_router_recv_from(struct msm_ipc_port *port_ptr, struct rr_packet **pkt, struct msm_ipc_addr *src, long timeout) { int ret, data_len, align_size; struct sk_buff *temp_skb; struct rr_header_v1 *hdr = NULL; if (!port_ptr || !pkt) { IPC_RTR_ERR("%s: Invalid pointers being passed\n", __func__); return -EINVAL; } *pkt = NULL; ret = msm_ipc_router_rx_data_wait(port_ptr, timeout); if (ret) return ret; ret = msm_ipc_router_read(port_ptr, pkt, 0); if (ret <= 0 || !(*pkt)) return ret; hdr = &((*pkt)->hdr); if (src) { src->addrtype = MSM_IPC_ADDR_ID; src->addr.port_addr.node_id = hdr->src_node_id; src->addr.port_addr.port_id = hdr->src_port_id; } data_len = hdr->size; align_size = ALIGN_SIZE(data_len); if (align_size) { temp_skb = skb_peek_tail((*pkt)->pkt_fragment_q); if (temp_skb) skb_trim(temp_skb, (temp_skb->len - align_size)); } return data_len; } int msm_ipc_router_read_msg(struct msm_ipc_port *port_ptr, struct msm_ipc_addr *src, unsigned char **data, unsigned int *len) { struct rr_packet *pkt; int ret; ret = msm_ipc_router_recv_from(port_ptr, &pkt, src, 0); if (ret < 0) { if (ret != -ENOMSG) IPC_RTR_ERR( "%s: msm_ipc_router_recv_from failed - ret: %d\n", __func__, ret); return ret; } *data = msm_ipc_router_skb_to_buf(pkt->pkt_fragment_q, ret); if (!(*data)) { IPC_RTR_ERR("%s: Buf conversion failed\n", __func__); release_pkt(pkt); return -ENOMEM; } *len = ret; release_pkt(pkt); return 0; } /** * msm_ipc_router_create_port() - Create a IPC Router port/endpoint * @notify: Callback function to notify any event on the port. * @event: Event ID to be handled. * @oob_data: Any out-of-band data associated with the event. * @oob_data_len: Size of the out-of-band data, if valid. * @priv: Private data registered during the port creation. * @priv: Private info to be passed while the notification is generated. * * @return: Pointer to the port on success, NULL on error. */ struct msm_ipc_port *msm_ipc_router_create_port( void (*notify)(unsigned event, void *oob_data, size_t oob_data_len, void *priv), void *priv) { struct msm_ipc_port *port_ptr; int ret; ret = ipc_router_core_init(); if (ret < 0) { IPC_RTR_ERR("%s: Error %d initializing IPC Router\n", __func__, ret); return NULL; } port_ptr = msm_ipc_router_create_raw_port(NULL, notify, priv); if (!port_ptr) IPC_RTR_ERR("%s: port_ptr alloc failed\n", __func__); return port_ptr; } int msm_ipc_router_close_port(struct msm_ipc_port *port_ptr) { union rr_control_msg msg; struct msm_ipc_server *server; struct msm_ipc_router_remote_port *rport_ptr; if (!port_ptr) return -EINVAL; if (port_ptr->type == SERVER_PORT || port_ptr->type == CLIENT_PORT) { down_write(&local_ports_lock_lhc2); list_del(&port_ptr->list); up_write(&local_ports_lock_lhc2); mutex_lock(&port_ptr->port_lock_lhc3); rport_ptr = (struct msm_ipc_router_remote_port *) port_ptr->rport_info; port_ptr->rport_info = NULL; mutex_unlock(&port_ptr->port_lock_lhc3); if (rport_ptr) { ipc_router_reset_conn(rport_ptr); ipc_router_destroy_rport(rport_ptr); } if (port_ptr->type == SERVER_PORT) { memset(&msg, 0, sizeof(msg)); msg.cmd = IPC_ROUTER_CTRL_CMD_REMOVE_SERVER; msg.srv.service = port_ptr->port_name.service; msg.srv.instance = port_ptr->port_name.instance; msg.srv.node_id = port_ptr->this_port.node_id; msg.srv.port_id = port_ptr->this_port.port_id; broadcast_ctl_msg(&msg); } /* Server port could have been a client port earlier. * Send REMOVE_CLIENT message in either case. */ msm_ipc_router_send_remove_client(&port_ptr->mode_info, port_ptr->this_port.node_id, port_ptr->this_port.port_id); } else if (port_ptr->type == CONTROL_PORT) { down_write(&control_ports_lock_lha5); list_del(&port_ptr->list); up_write(&control_ports_lock_lha5); } else if (port_ptr->type == IRSC_PORT) { down_write(&local_ports_lock_lhc2); list_del(&port_ptr->list); up_write(&local_ports_lock_lhc2); signal_irsc_completion(); } if (port_ptr->type == SERVER_PORT) { server = ipc_router_get_server_ref( port_ptr->port_name.service, port_ptr->port_name.instance, port_ptr->this_port.node_id, port_ptr->this_port.port_id); if (server) { kref_put(&server->ref, ipc_router_release_server); ipc_router_destroy_server(server, port_ptr->this_port.node_id, port_ptr->this_port.port_id); } } mutex_lock(&port_ptr->port_lock_lhc3); rport_ptr = (struct msm_ipc_router_remote_port *)port_ptr->rport_info; port_ptr->rport_info = NULL; mutex_unlock(&port_ptr->port_lock_lhc3); if (rport_ptr) ipc_router_destroy_rport(rport_ptr); kref_put(&port_ptr->ref, ipc_router_release_port); return 0; } int msm_ipc_router_get_curr_pkt_size(struct msm_ipc_port *port_ptr) { struct rr_packet *pkt; int rc = 0; if (!port_ptr) return -EINVAL; mutex_lock(&port_ptr->port_rx_q_lock_lhc3); if (!list_empty(&port_ptr->port_rx_q)) { pkt = list_first_entry(&port_ptr->port_rx_q, struct rr_packet, list); rc = pkt->hdr.size; } mutex_unlock(&port_ptr->port_rx_q_lock_lhc3); return rc; } int msm_ipc_router_bind_control_port(struct msm_ipc_port *port_ptr) { if (unlikely(!port_ptr || port_ptr->type != CLIENT_PORT)) return -EINVAL; down_write(&local_ports_lock_lhc2); list_del(&port_ptr->list); up_write(&local_ports_lock_lhc2); port_ptr->type = CONTROL_PORT; down_write(&control_ports_lock_lha5); list_add_tail(&port_ptr->list, &control_ports); up_write(&control_ports_lock_lha5); return 0; } int msm_ipc_router_lookup_server_name(struct msm_ipc_port_name *srv_name, struct msm_ipc_server_info *srv_info, int num_entries_in_array, uint32_t lookup_mask) { struct msm_ipc_server *server; struct msm_ipc_server_port *server_port; int key, i = 0; /*num_entries_found*/ if (!srv_name) { IPC_RTR_ERR("%s: Invalid srv_name\n", __func__); return -EINVAL; } if (num_entries_in_array && !srv_info) { IPC_RTR_ERR("%s: srv_info NULL\n", __func__); return -EINVAL; } down_read(&server_list_lock_lha2); key = (srv_name->service & (SRV_HASH_SIZE - 1)); list_for_each_entry(server, &server_list[key], list) { if ((server->name.service != srv_name->service) || ((server->name.instance & lookup_mask) != srv_name->instance)) continue; list_for_each_entry(server_port, &server->server_port_list, list) { if (i < num_entries_in_array) { srv_info[i].node_id = server_port->server_addr.node_id; srv_info[i].port_id = server_port->server_addr.port_id; srv_info[i].service = server->name.service; srv_info[i].instance = server->name.instance; } i++; } } up_read(&server_list_lock_lha2); return i; } int msm_ipc_router_close(void) { struct msm_ipc_router_xprt_info *xprt_info, *tmp_xprt_info; down_write(&xprt_info_list_lock_lha5); list_for_each_entry_safe(xprt_info, tmp_xprt_info, &xprt_info_list, list) { xprt_info->xprt->close(xprt_info->xprt); list_del(&xprt_info->list); kfree(xprt_info); } up_write(&xprt_info_list_lock_lha5); return 0; } /** * pil_vote_load_worker() - Process vote to load the modem * * @work: Work item to process * * This function is called to process votes to load the modem that have been * queued by msm_ipc_load_default_node(). */ static void pil_vote_load_worker(struct work_struct *work) { struct pil_vote_info *vote_info; vote_info = container_of(work, struct pil_vote_info, load_work); if (strlen(default_peripheral)) { vote_info->pil_handle = subsystem_get(default_peripheral); if (IS_ERR(vote_info->pil_handle)) { IPC_RTR_ERR("%s: Failed to load %s\n", __func__, default_peripheral); vote_info->pil_handle = NULL; } } else { vote_info->pil_handle = NULL; } } /** * pil_vote_unload_worker() - Process vote to unload the modem * * @work: Work item to process * * This function is called to process votes to unload the modem that have been * queued by msm_ipc_unload_default_node(). */ static void pil_vote_unload_worker(struct work_struct *work) { struct pil_vote_info *vote_info; vote_info = container_of(work, struct pil_vote_info, unload_work); if (vote_info->pil_handle) { subsystem_put(vote_info->pil_handle); vote_info->pil_handle = NULL; } kfree(vote_info); } /** * msm_ipc_load_default_node() - Queue a vote to load the modem. * * @return: PIL vote info structure on success, NULL on failure. * * This function places a work item that loads the modem on the * single-threaded workqueue used for processing PIL votes to load * or unload the modem. */ void *msm_ipc_load_default_node(void) { struct pil_vote_info *vote_info; vote_info = kmalloc(sizeof(*vote_info), GFP_KERNEL); if (!vote_info) return vote_info; INIT_WORK(&vote_info->load_work, pil_vote_load_worker); queue_work(msm_ipc_router_workqueue, &vote_info->load_work); return vote_info; } /** * msm_ipc_unload_default_node() - Queue a vote to unload the modem. * * @pil_vote: PIL vote info structure, containing the PIL handle * and work structure. * * This function places a work item that unloads the modem on the * single-threaded workqueue used for processing PIL votes to load * or unload the modem. */ void msm_ipc_unload_default_node(void *pil_vote) { struct pil_vote_info *vote_info; if (pil_vote) { vote_info = (struct pil_vote_info *)pil_vote; INIT_WORK(&vote_info->unload_work, pil_vote_unload_worker); queue_work(msm_ipc_router_workqueue, &vote_info->unload_work); } } #if defined(CONFIG_DEBUG_FS) static void dump_routing_table(struct seq_file *s) { int j; struct msm_ipc_routing_table_entry *rt_entry; seq_printf(s, "%-10s|%-20s|%-10s|\n", "Node Id", "XPRT Name", "Next Hop"); seq_puts(s, "----------------------------------------------\n"); for (j = 0; j < RT_HASH_SIZE; j++) { down_read(&routing_table_lock_lha3); list_for_each_entry(rt_entry, &routing_table[j], list) { down_read(&rt_entry->lock_lha4); seq_printf(s, "0x%08x|", rt_entry->node_id); if (rt_entry->node_id == IPC_ROUTER_NID_LOCAL) seq_printf(s, "%-20s|0x%08x|\n", "Loopback", rt_entry->node_id); else seq_printf(s, "%-20s|0x%08x|\n", rt_entry->xprt_info->xprt->name, rt_entry->node_id); up_read(&rt_entry->lock_lha4); } up_read(&routing_table_lock_lha3); } } static void dump_xprt_info(struct seq_file *s) { struct msm_ipc_router_xprt_info *xprt_info; seq_printf(s, "%-20s|%-10s|%-12s|%-15s|\n", "XPRT Name", "Link ID", "Initialized", "Remote Node Id"); seq_puts(s, "------------------------------------------------------------\n"); down_read(&xprt_info_list_lock_lha5); list_for_each_entry(xprt_info, &xprt_info_list, list) seq_printf(s, "%-20s|0x%08x|%-12s|0x%08x|\n", xprt_info->xprt->name, xprt_info->xprt->link_id, (xprt_info->initialized ? "Y" : "N"), xprt_info->remote_node_id); up_read(&xprt_info_list_lock_lha5); } static void dump_servers(struct seq_file *s) { int j; struct msm_ipc_server *server; struct msm_ipc_server_port *server_port; seq_printf(s, "%-11s|%-11s|%-11s|%-11s|\n", "Service", "Instance", "Node_id", "Port_id"); seq_puts(s, "------------------------------------------------------------\n"); down_read(&server_list_lock_lha2); for (j = 0; j < SRV_HASH_SIZE; j++) { list_for_each_entry(server, &server_list[j], list) { list_for_each_entry(server_port, &server->server_port_list, list) seq_printf(s, "0x%08x |0x%08x |0x%08x |0x%08x |\n", server->name.service, server->name.instance, server_port->server_addr.node_id, server_port->server_addr.port_id); } } up_read(&server_list_lock_lha2); } static void dump_remote_ports(struct seq_file *s) { int j, k; struct msm_ipc_router_remote_port *rport_ptr; struct msm_ipc_routing_table_entry *rt_entry; seq_printf(s, "%-11s|%-11s|%-10s|\n", "Node_id", "Port_id", "Quota_cnt"); seq_puts(s, "------------------------------------------------------------\n"); for (j = 0; j < RT_HASH_SIZE; j++) { down_read(&routing_table_lock_lha3); list_for_each_entry(rt_entry, &routing_table[j], list) { down_read(&rt_entry->lock_lha4); for (k = 0; k < RP_HASH_SIZE; k++) { list_for_each_entry(rport_ptr, &rt_entry->remote_port_list[k], list) seq_printf(s, "0x%08x |0x%08x |0x%08x|\n", rport_ptr->node_id, rport_ptr->port_id, rport_ptr->tx_quota_cnt); } up_read(&rt_entry->lock_lha4); } up_read(&routing_table_lock_lha3); } } static void dump_control_ports(struct seq_file *s) { struct msm_ipc_port *port_ptr; seq_printf(s, "%-11s|%-11s|\n", "Node_id", "Port_id"); seq_puts(s, "------------------------------------------------------------\n"); down_read(&control_ports_lock_lha5); list_for_each_entry(port_ptr, &control_ports, list) seq_printf(s, "0x%08x |0x%08x |\n", port_ptr->this_port.node_id, port_ptr->this_port.port_id); up_read(&control_ports_lock_lha5); } static void dump_local_ports(struct seq_file *s) { int j; struct msm_ipc_port *port_ptr; seq_printf(s, "%-11s|%-11s|\n", "Node_id", "Port_id"); seq_puts(s, "------------------------------------------------------------\n"); down_read(&local_ports_lock_lhc2); for (j = 0; j < LP_HASH_SIZE; j++) { list_for_each_entry(port_ptr, &local_ports[j], list) { mutex_lock(&port_ptr->port_lock_lhc3); seq_printf(s, "0x%08x |0x%08x |\n", port_ptr->this_port.node_id, port_ptr->this_port.port_id); mutex_unlock(&port_ptr->port_lock_lhc3); } } up_read(&local_ports_lock_lhc2); } static int debugfs_show(struct seq_file *s, void *data) { void (*show)(struct seq_file *) = s->private; show(s); return 0; } static int debug_open(struct inode *inode, struct file *file) { return single_open(file, debugfs_show, inode->i_private); } static const struct file_operations debug_ops = { .open = debug_open, .release = single_release, .read = seq_read, .llseek = seq_lseek, }; static void debug_create(const char *name, struct dentry *dent, void (*show)(struct seq_file *)) { debugfs_create_file(name, 0444, dent, show, &debug_ops); } static void debugfs_init(void) { struct dentry *dent; dent = debugfs_create_dir("msm_ipc_router", 0); if (IS_ERR(dent)) return; debug_create("dump_local_ports", dent, dump_local_ports); debug_create("dump_remote_ports", dent, dump_remote_ports); debug_create("dump_control_ports", dent, dump_control_ports); debug_create("dump_servers", dent, dump_servers); debug_create("dump_xprt_info", dent, dump_xprt_info); debug_create("dump_routing_table", dent, dump_routing_table); } #else static void debugfs_init(void) {} #endif /** * ipc_router_create_log_ctx() - Create and add the log context based on transport * @name: subsystem name * * Return: a reference to the log context created * * This function creates ipc log context based on transport and adds it to a * global list. This log context can be reused from the list in case of a * subsystem restart. */ static void *ipc_router_create_log_ctx(char *name) { struct ipc_rtr_log_ctx *sub_log_ctx; sub_log_ctx = kmalloc(sizeof(struct ipc_rtr_log_ctx), GFP_KERNEL); if (!sub_log_ctx) return NULL; sub_log_ctx->log_ctx = ipc_log_context_create( IPC_RTR_INFO_PAGES, name, 0); if (!sub_log_ctx->log_ctx) { IPC_RTR_ERR("%s: Unable to create IPC logging for [%s]", __func__, name); kfree(sub_log_ctx); return NULL; } strlcpy(sub_log_ctx->log_ctx_name, name, LOG_CTX_NAME_LEN); INIT_LIST_HEAD(&sub_log_ctx->list); list_add_tail(&sub_log_ctx->list, &log_ctx_list); return sub_log_ctx->log_ctx; } static void ipc_router_log_ctx_init(void) { mutex_lock(&log_ctx_list_lock_lha0); local_log_ctx = ipc_router_create_log_ctx("local_IPCRTR"); mutex_unlock(&log_ctx_list_lock_lha0); } /** * ipc_router_get_log_ctx() - Retrieves the ipc log context based on subsystem name. * @sub_name: subsystem name * * Return: a reference to the log context */ static void *ipc_router_get_log_ctx(char *sub_name) { void *log_ctx = NULL; struct ipc_rtr_log_ctx *temp_log_ctx; mutex_lock(&log_ctx_list_lock_lha0); list_for_each_entry(temp_log_ctx, &log_ctx_list, list) if (!strcmp(temp_log_ctx->log_ctx_name, sub_name)) { log_ctx = temp_log_ctx->log_ctx; mutex_unlock(&log_ctx_list_lock_lha0); return log_ctx; } log_ctx = ipc_router_create_log_ctx(sub_name); mutex_unlock(&log_ctx_list_lock_lha0); return log_ctx; } /** * ipc_router_get_xprt_info_ref() - Get a reference to the xprt_info structure * @xprt_info: pointer to the xprt_info. * * @return: Zero on success, -ENODEV on failure. * * This function is used to obtain a reference to the xprt_info structure * corresponding to the requested @xprt_info pointer. */ static int ipc_router_get_xprt_info_ref( struct msm_ipc_router_xprt_info *xprt_info) { int ret = -ENODEV; struct msm_ipc_router_xprt_info *tmp_xprt_info; if (!xprt_info) return 0; down_read(&xprt_info_list_lock_lha5); list_for_each_entry(tmp_xprt_info, &xprt_info_list, list) { if (tmp_xprt_info == xprt_info) { kref_get(&xprt_info->ref); ret = 0; break; } } up_read(&xprt_info_list_lock_lha5); return ret; } /** * ipc_router_put_xprt_info_ref() - Put a reference to the xprt_info structure * @xprt_info: pointer to the xprt_info. * * This function is used to put the reference to the xprt_info structure * corresponding to the requested @xprt_info pointer. */ static void ipc_router_put_xprt_info_ref( struct msm_ipc_router_xprt_info *xprt_info) { if (xprt_info) kref_put(&xprt_info->ref, ipc_router_release_xprt_info_ref); } /** * ipc_router_release_xprt_info_ref() - release the xprt_info last reference * @ref: Reference to the xprt_info structure. * * This function is called when all references to the xprt_info structure * are released. */ static void ipc_router_release_xprt_info_ref(struct kref *ref) { struct msm_ipc_router_xprt_info *xprt_info = container_of(ref, struct msm_ipc_router_xprt_info, ref); complete_all(&xprt_info->ref_complete); } static int msm_ipc_router_add_xprt(struct msm_ipc_router_xprt *xprt) { struct msm_ipc_router_xprt_info *xprt_info; xprt_info = kmalloc(sizeof(struct msm_ipc_router_xprt_info), GFP_KERNEL); if (!xprt_info) return -ENOMEM; xprt_info->xprt = xprt; xprt_info->initialized = 0; xprt_info->hello_sent = 0; xprt_info->remote_node_id = -1; INIT_LIST_HEAD(&xprt_info->pkt_list); mutex_init(&xprt_info->rx_lock_lhb2); mutex_init(&xprt_info->tx_lock_lhb2); wakeup_source_init(&xprt_info->ws, xprt->name); xprt_info->need_len = 0; xprt_info->abort_data_read = 0; INIT_WORK(&xprt_info->read_data, do_read_data); INIT_LIST_HEAD(&xprt_info->list); kref_init(&xprt_info->ref); init_completion(&xprt_info->ref_complete); xprt_info->workqueue = create_singlethread_workqueue(xprt->name); if (!xprt_info->workqueue) { kfree(xprt_info); return -ENOMEM; } xprt_info->log_ctx = ipc_router_get_log_ctx(xprt->name); if (!strcmp(xprt->name, "msm_ipc_router_loopback_xprt")) { xprt_info->remote_node_id = IPC_ROUTER_NID_LOCAL; xprt_info->initialized = 1; } IPC_RTR_INFO(xprt_info->log_ctx, "Adding xprt: [%s]\n", xprt->name); down_write(&xprt_info_list_lock_lha5); list_add_tail(&xprt_info->list, &xprt_info_list); up_write(&xprt_info_list_lock_lha5); down_write(&routing_table_lock_lha3); if (!routing_table_inited) { init_routing_table(); routing_table_inited = 1; } up_write(&routing_table_lock_lha3); xprt->priv = xprt_info; send_hello_msg(xprt_info); return 0; } static void msm_ipc_router_remove_xprt(struct msm_ipc_router_xprt *xprt) { struct msm_ipc_router_xprt_info *xprt_info; struct rr_packet *temp_pkt, *pkt; if (xprt && xprt->priv) { xprt_info = xprt->priv; IPC_RTR_INFO(xprt_info->log_ctx, "Removing xprt: [%s]\n", xprt->name); mutex_lock(&xprt_info->rx_lock_lhb2); xprt_info->abort_data_read = 1; mutex_unlock(&xprt_info->rx_lock_lhb2); flush_workqueue(xprt_info->workqueue); destroy_workqueue(xprt_info->workqueue); mutex_lock(&xprt_info->rx_lock_lhb2); list_for_each_entry_safe(pkt, temp_pkt, &xprt_info->pkt_list, list) { list_del(&pkt->list); release_pkt(pkt); } mutex_unlock(&xprt_info->rx_lock_lhb2); down_write(&xprt_info_list_lock_lha5); list_del(&xprt_info->list); up_write(&xprt_info_list_lock_lha5); msm_ipc_cleanup_routing_table(xprt_info); wakeup_source_trash(&xprt_info->ws); ipc_router_put_xprt_info_ref(xprt_info); wait_for_completion(&xprt_info->ref_complete); xprt->priv = 0; kfree(xprt_info); } } struct msm_ipc_router_xprt_work { struct msm_ipc_router_xprt *xprt; struct work_struct work; }; static void xprt_open_worker(struct work_struct *work) { struct msm_ipc_router_xprt_work *xprt_work = container_of(work, struct msm_ipc_router_xprt_work, work); msm_ipc_router_add_xprt(xprt_work->xprt); kfree(xprt_work); } static void xprt_close_worker(struct work_struct *work) { struct msm_ipc_router_xprt_work *xprt_work = container_of(work, struct msm_ipc_router_xprt_work, work); msm_ipc_router_remove_xprt(xprt_work->xprt); xprt_work->xprt->sft_close_done(xprt_work->xprt); kfree(xprt_work); } void msm_ipc_router_xprt_notify(struct msm_ipc_router_xprt *xprt, unsigned event, void *data) { struct msm_ipc_router_xprt_info *xprt_info = xprt->priv; struct msm_ipc_router_xprt_work *xprt_work; struct msm_ipc_router_remote_port *rport_ptr = NULL; struct rr_packet *pkt; int ret; ret = ipc_router_core_init(); if (ret < 0) { IPC_RTR_ERR("%s: Error %d initializing IPC Router\n", __func__, ret); return; } switch (event) { case IPC_ROUTER_XPRT_EVENT_OPEN: xprt_work = kmalloc(sizeof(struct msm_ipc_router_xprt_work), GFP_ATOMIC); if (xprt_work) { xprt_work->xprt = xprt; INIT_WORK(&xprt_work->work, xprt_open_worker); queue_work(msm_ipc_router_workqueue, &xprt_work->work); } else { IPC_RTR_ERR( "%s: malloc failure - Couldn't notify OPEN event", __func__); } break; case IPC_ROUTER_XPRT_EVENT_CLOSE: xprt_work = kmalloc(sizeof(struct msm_ipc_router_xprt_work), GFP_ATOMIC); if (xprt_work) { xprt_work->xprt = xprt; INIT_WORK(&xprt_work->work, xprt_close_worker); queue_work(msm_ipc_router_workqueue, &xprt_work->work); } else { IPC_RTR_ERR( "%s: malloc failure - Couldn't notify CLOSE event", __func__); } break; } if (!data) return; while (!xprt_info) { msleep(100); xprt_info = xprt->priv; } pkt = clone_pkt((struct rr_packet *)data); if (!pkt) return; if (pkt->length < calc_rx_header_size(xprt_info) || pkt->length > MAX_IPC_PKT_SIZE) { IPC_RTR_ERR("%s: Invalid pkt length %d\n", __func__, pkt->length); release_pkt(pkt); return; } ret = extract_header(pkt); if (ret < 0) { release_pkt(pkt); return; } pkt->ws_need = true; if (pkt->hdr.type == IPC_ROUTER_CTRL_CMD_DATA) rport_ptr = ipc_router_get_rport_ref(pkt->hdr.src_node_id, pkt->hdr.src_port_id); mutex_lock(&xprt_info->rx_lock_lhb2); list_add_tail(&pkt->list, &xprt_info->pkt_list); /* check every pkt is from SENSOR services or not*/ if (is_sensor_port(rport_ptr)) pkt->ws_need = false; else __pm_stay_awake(&xprt_info->ws); mutex_unlock(&xprt_info->rx_lock_lhb2); queue_work(xprt_info->workqueue, &xprt_info->read_data); } /** * parse_devicetree() - parse device tree binding * * @node: pointer to device tree node * * @return: 0 on success, -ENODEV on failure. */ static int parse_devicetree(struct device_node *node) { char *key; const char *peripheral = NULL; key = "qcom,default-peripheral"; peripheral = of_get_property(node, key, NULL); if (peripheral) strlcpy(default_peripheral, peripheral, PIL_SUBSYSTEM_NAME_LEN); return 0; } /** * ipc_router_probe() - Probe the IPC Router * * @pdev: Platform device corresponding to IPC Router. * * @return: 0 on success, standard Linux error codes on error. * * This function is called when the underlying device tree driver registers * a platform device, mapped to IPC Router. */ static int ipc_router_probe(struct platform_device *pdev) { int ret = 0; if (pdev && pdev->dev.of_node) { ret = parse_devicetree(pdev->dev.of_node); if (ret) IPC_RTR_ERR("%s: Failed to parse device tree\n", __func__); } return ret; } static struct of_device_id ipc_router_match_table[] = { { .compatible = "qcom,ipc_router" }, {}, }; static struct platform_driver ipc_router_driver = { .probe = ipc_router_probe, .driver = { .name = MODULE_NAME, .owner = THIS_MODULE, .of_match_table = ipc_router_match_table, }, }; /** * ipc_router_core_init() - Initialize all IPC Router core data structures * * Return: 0 on Success or Standard error code otherwise. * * This function only initializes all the core data structures to the IPC Router * module. The remaining initialization is done inside msm_ipc_router_init(). */ static int ipc_router_core_init(void) { int i; int ret; struct msm_ipc_routing_table_entry *rt_entry; mutex_lock(&ipc_router_init_lock); if (likely(is_ipc_router_inited)) { mutex_unlock(&ipc_router_init_lock); return 0; } debugfs_init(); for (i = 0; i < SRV_HASH_SIZE; i++) INIT_LIST_HEAD(&server_list[i]); for (i = 0; i < LP_HASH_SIZE; i++) INIT_LIST_HEAD(&local_ports[i]); down_write(&routing_table_lock_lha3); if (!routing_table_inited) { init_routing_table(); routing_table_inited = 1; } up_write(&routing_table_lock_lha3); rt_entry = create_routing_table_entry(IPC_ROUTER_NID_LOCAL, NULL); kref_put(&rt_entry->ref, ipc_router_release_rtentry); msm_ipc_router_workqueue = create_singlethread_workqueue("msm_ipc_router"); if (!msm_ipc_router_workqueue) { mutex_unlock(&ipc_router_init_lock); return -ENOMEM; } ret = msm_ipc_router_security_init(); if (ret < 0) IPC_RTR_ERR("%s: Security Init failed\n", __func__); else is_ipc_router_inited = true; mutex_unlock(&ipc_router_init_lock); return ret; } static int msm_ipc_router_init(void) { int ret; ret = ipc_router_core_init(); if (ret < 0) return ret; ret = platform_driver_register(&ipc_router_driver); if (ret) IPC_RTR_ERR( "%s: ipc_router_driver register failed %d\n", __func__, ret); ret = msm_ipc_router_init_sockets(); if (ret < 0) IPC_RTR_ERR("%s: Init sockets failed\n", __func__); ipc_router_log_ctx_init(); return ret; } module_init(msm_ipc_router_init); MODULE_DESCRIPTION("MSM IPC Router"); MODULE_LICENSE("GPL v2");