Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C) ST-Ericsson AB 2010
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Author:	Sjur Brendeland
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/stddef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/rculist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <net/caif/cfpkt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <net/caif/cfmuxl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <net/caif/cfsrvl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <net/caif/cffrml.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #define container_obj(layr) container_of(layr, struct cfmuxl, layer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #define CAIF_CTRL_CHANNEL 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define UP_CACHE_SIZE 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #define DN_CACHE_SIZE 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) struct cfmuxl {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	struct cflayer layer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	struct list_head srvl_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	struct list_head frml_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	struct cflayer *up_cache[UP_CACHE_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	struct cflayer *dn_cache[DN_CACHE_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	 * Set when inserting or removing downwards layers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	spinlock_t transmit_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	 * Set when inserting or removing upwards layers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	spinlock_t receive_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) static int cfmuxl_receive(struct cflayer *layr, struct cfpkt *pkt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) static int cfmuxl_transmit(struct cflayer *layr, struct cfpkt *pkt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) static void cfmuxl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 			   int phyid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) static struct cflayer *get_up(struct cfmuxl *muxl, u16 id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) struct cflayer *cfmuxl_create(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	struct cfmuxl *this = kzalloc(sizeof(struct cfmuxl), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	if (!this)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	this->layer.receive = cfmuxl_receive;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	this->layer.transmit = cfmuxl_transmit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	this->layer.ctrlcmd = cfmuxl_ctrlcmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	INIT_LIST_HEAD(&this->srvl_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	INIT_LIST_HEAD(&this->frml_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	spin_lock_init(&this->transmit_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	spin_lock_init(&this->receive_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	snprintf(this->layer.name, CAIF_LAYER_NAME_SZ, "mux");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	return &this->layer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) int cfmuxl_set_dnlayer(struct cflayer *layr, struct cflayer *dn, u8 phyid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	struct cfmuxl *muxl = (struct cfmuxl *) layr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	spin_lock_bh(&muxl->transmit_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	list_add_rcu(&dn->node, &muxl->frml_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	spin_unlock_bh(&muxl->transmit_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) static struct cflayer *get_from_id(struct list_head *list, u16 id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	struct cflayer *lyr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	list_for_each_entry_rcu(lyr, list, node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		if (lyr->id == id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 			return lyr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) int cfmuxl_set_uplayer(struct cflayer *layr, struct cflayer *up, u8 linkid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	struct cfmuxl *muxl = container_obj(layr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	struct cflayer *old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	spin_lock_bh(&muxl->receive_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	/* Two entries with same id is wrong, so remove old layer from mux */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	old = get_from_id(&muxl->srvl_list, linkid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	if (old != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		list_del_rcu(&old->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	list_add_rcu(&up->node, &muxl->srvl_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	spin_unlock_bh(&muxl->receive_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) struct cflayer *cfmuxl_remove_dnlayer(struct cflayer *layr, u8 phyid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	struct cfmuxl *muxl = container_obj(layr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	struct cflayer *dn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	int idx = phyid % DN_CACHE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	spin_lock_bh(&muxl->transmit_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	RCU_INIT_POINTER(muxl->dn_cache[idx], NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	dn = get_from_id(&muxl->frml_list, phyid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	if (dn == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	list_del_rcu(&dn->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	caif_assert(dn != NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	spin_unlock_bh(&muxl->transmit_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	return dn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static struct cflayer *get_up(struct cfmuxl *muxl, u16 id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	struct cflayer *up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	int idx = id % UP_CACHE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	up = rcu_dereference(muxl->up_cache[idx]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	if (up == NULL || up->id != id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		spin_lock_bh(&muxl->receive_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		up = get_from_id(&muxl->srvl_list, id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		rcu_assign_pointer(muxl->up_cache[idx], up);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		spin_unlock_bh(&muxl->receive_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	return up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static struct cflayer *get_dn(struct cfmuxl *muxl, struct dev_info *dev_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	struct cflayer *dn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	int idx = dev_info->id % DN_CACHE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	dn = rcu_dereference(muxl->dn_cache[idx]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	if (dn == NULL || dn->id != dev_info->id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		spin_lock_bh(&muxl->transmit_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		dn = get_from_id(&muxl->frml_list, dev_info->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		rcu_assign_pointer(muxl->dn_cache[idx], dn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		spin_unlock_bh(&muxl->transmit_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	return dn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) struct cflayer *cfmuxl_remove_uplayer(struct cflayer *layr, u8 id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	struct cflayer *up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	struct cfmuxl *muxl = container_obj(layr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	int idx = id % UP_CACHE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	if (id == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		pr_warn("Trying to remove control layer\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	spin_lock_bh(&muxl->receive_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	up = get_from_id(&muxl->srvl_list, id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	if (up == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	RCU_INIT_POINTER(muxl->up_cache[idx], NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	list_del_rcu(&up->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	spin_unlock_bh(&muxl->receive_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	return up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static int cfmuxl_receive(struct cflayer *layr, struct cfpkt *pkt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	struct cfmuxl *muxl = container_obj(layr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	u8 id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	struct cflayer *up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	if (cfpkt_extr_head(pkt, &id, 1) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		pr_err("erroneous Caif Packet\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		cfpkt_destroy(pkt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		return -EPROTO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	up = get_up(muxl, id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	if (up == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		pr_debug("Received data on unknown link ID = %d (0x%x)"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 			" up == NULL", id, id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		cfpkt_destroy(pkt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		 * Don't return ERROR, since modem misbehaves and sends out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		 * flow on before linksetup response.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		return /* CFGLU_EPROT; */ 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	/* We can't hold rcu_lock during receive, so take a ref count instead */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	cfsrvl_get(up);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	ret = up->receive(up, pkt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	cfsrvl_put(up);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) static int cfmuxl_transmit(struct cflayer *layr, struct cfpkt *pkt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	struct cfmuxl *muxl = container_obj(layr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	u8 linkid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	struct cflayer *dn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	struct caif_payload_info *info = cfpkt_info(pkt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	BUG_ON(!info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	dn = get_dn(muxl, info->dev_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	if (dn == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		pr_debug("Send data on unknown phy ID = %d (0x%x)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 			info->dev_info->id, info->dev_info->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		cfpkt_destroy(pkt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		return -ENOTCONN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	info->hdr_len += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	linkid = info->channel_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	cfpkt_add_head(pkt, &linkid, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	/* We can't hold rcu_lock during receive, so take a ref count instead */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	cffrml_hold(dn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	err = dn->transmit(dn, pkt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	cffrml_put(dn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) static void cfmuxl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 			   int phyid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	struct cfmuxl *muxl = container_obj(layr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	struct cflayer *layer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	list_for_each_entry_rcu(layer, &muxl->srvl_list, node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		if (cfsrvl_phyid_match(layer, phyid) && layer->ctrlcmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 			if ((ctrl == _CAIF_CTRLCMD_PHYIF_DOWN_IND ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 				ctrl == CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 					layer->id != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 				cfmuxl_remove_uplayer(layr, layer->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			/* NOTE: ctrlcmd is not allowed to block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 			layer->ctrlcmd(layer, ctrl, phyid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }