| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Emmanuel Grumbach | 8208 | 92.56% | 9 | 30.00% |
| Avraham Stern | 623 | 7.03% | 14 | 46.67% |
| Johannes Berg | 35 | 0.39% | 5 | 16.67% |
| Colin Ian King | 1 | 0.01% | 1 | 3.33% |
| Tom Rix | 1 | 0.01% | 1 | 3.33% |
| Total | 8868 | 30 |
// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2021-2023 Intel Corporation */ #include <linux/etherdevice.h> #include <linux/netdevice.h> #include <linux/ieee80211.h> #include <linux/rtnetlink.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/mei_cl_bus.h> #include <linux/rcupdate.h> #include <linux/debugfs.h> #include <linux/skbuff.h> #include <linux/wait.h> #include <linux/slab.h> #include <linux/mm.h> #include <net/cfg80211.h> #include "internal.h" #include "iwl-mei.h" #include "trace.h" #include "trace-data.h" #include "sap.h" MODULE_DESCRIPTION("The Intel(R) wireless / CSME firmware interface"); MODULE_LICENSE("GPL"); #define MEI_WLAN_UUID UUID_LE(0x13280904, 0x7792, 0x4fcb, \ 0xa1, 0xaa, 0x5e, 0x70, 0xcb, 0xb1, 0xe8, 0x65) /* After CSME takes ownership, it won't release it for 60 seconds to avoid * frequent ownership transitions. */ #define MEI_OWNERSHIP_RETAKE_TIMEOUT_MS msecs_to_jiffies(60000) /* * Since iwlwifi calls iwlmei without any context, hold a pointer to the * mei_cl_device structure here. * Define a mutex that will synchronize all the flows between iwlwifi and * iwlmei. * Note that iwlmei can't have several instances, so it ok to have static * variables here. */ static struct mei_cl_device *iwl_mei_global_cldev; static DEFINE_MUTEX(iwl_mei_mutex); static unsigned long iwl_mei_status; enum iwl_mei_status_bits { IWL_MEI_STATUS_SAP_CONNECTED, }; bool iwl_mei_is_connected(void) { return test_bit(IWL_MEI_STATUS_SAP_CONNECTED, &iwl_mei_status); } EXPORT_SYMBOL_GPL(iwl_mei_is_connected); #define SAP_VERSION 3 #define SAP_CONTROL_BLOCK_ID 0x21504153 /* SAP! in ASCII */ struct iwl_sap_q_ctrl_blk { __le32 wr_ptr; __le32 rd_ptr; __le32 size; }; enum iwl_sap_q_idx { SAP_QUEUE_IDX_NOTIF = 0, SAP_QUEUE_IDX_DATA, SAP_QUEUE_IDX_MAX, }; struct iwl_sap_dir { __le32 reserved; struct iwl_sap_q_ctrl_blk q_ctrl_blk[SAP_QUEUE_IDX_MAX]; }; enum iwl_sap_dir_idx { SAP_DIRECTION_HOST_TO_ME = 0, SAP_DIRECTION_ME_TO_HOST, SAP_DIRECTION_MAX, }; struct iwl_sap_shared_mem_ctrl_blk { __le32 sap_id; __le32 size; struct iwl_sap_dir dir[SAP_DIRECTION_MAX]; }; /* * The shared area has the following layout: * * +-----------------------------------+ * |struct iwl_sap_shared_mem_ctrl_blk | * +-----------------------------------+ * |Host -> ME data queue | * +-----------------------------------+ * |Host -> ME notif queue | * +-----------------------------------+ * |ME -> Host data queue | * +-----------------------------------+ * |ME -> host notif queue | * +-----------------------------------+ * |SAP control block id (SAP!) | * +-----------------------------------+ */ #define SAP_H2M_DATA_Q_SZ 48256 #define SAP_M2H_DATA_Q_SZ 24128 #define SAP_H2M_NOTIF_Q_SZ 2240 #define SAP_M2H_NOTIF_Q_SZ 62720 #define _IWL_MEI_SAP_SHARED_MEM_SZ \ (sizeof(struct iwl_sap_shared_mem_ctrl_blk) + \ SAP_H2M_DATA_Q_SZ + SAP_H2M_NOTIF_Q_SZ + \ SAP_M2H_DATA_Q_SZ + SAP_M2H_NOTIF_Q_SZ + 4) #define IWL_MEI_SAP_SHARED_MEM_SZ \ (roundup(_IWL_MEI_SAP_SHARED_MEM_SZ, PAGE_SIZE)) struct iwl_mei_shared_mem_ptrs { struct iwl_sap_shared_mem_ctrl_blk *ctrl; void *q_head[SAP_DIRECTION_MAX][SAP_QUEUE_IDX_MAX]; size_t q_size[SAP_DIRECTION_MAX][SAP_QUEUE_IDX_MAX]; }; struct iwl_mei_filters { struct rcu_head rcu_head; struct iwl_sap_oob_filters filters; }; /** * struct iwl_mei - holds the private date for iwl_mei * * @get_nvm_wq: the wait queue for the get_nvm flow * @send_csa_msg_wk: used to defer the transmission of the CHECK_SHARED_AREA * message. Used so that we can send CHECK_SHARED_AREA from atomic * contexts. * @get_ownership_wq: the wait queue for the get_ownership_flow * @shared_mem: the memory that is shared between CSME and the host * @cldev: the pointer to the MEI client device * @nvm: the data returned by the CSME for the NVM * @filters: the filters sent by CSME * @got_ownership: true if we own the device * @amt_enabled: true if CSME has wireless enabled * @csa_throttled: when true, we can't send CHECK_SHARED_AREA over the MEI * bus, but rather need to wait until send_csa_msg_wk runs * @csme_taking_ownership: true when CSME is taking ownership. Used to remember * to send CSME_OWNERSHIP_CONFIRMED when the driver completes its down * flow. * @link_prot_state: true when we are in link protection PASSIVE * @device_down: true if the device is down. Used to remember to send * CSME_OWNERSHIP_CONFIRMED when the driver is already down. * @csa_throttle_end_wk: used when &csa_throttled is true * @pldr_wq: the wait queue for PLDR flow * @pldr_active: PLDR flow is in progress * @data_q_lock: protects the access to the data queues which are * accessed without the mutex. * @netdev_work: used to defer registering and unregistering of the netdev to * avoid taking the rtnl lock in the SAP messages handlers. * @ownership_dwork: used to re-ask for NIC ownership after ownership was taken * by CSME or when a previous ownership request failed. * @sap_seq_no: the sequence number for the SAP messages * @seq_no: the sequence number for the SAP messages * @dbgfs_dir: the debugfs dir entry */ struct iwl_mei { wait_queue_head_t get_nvm_wq; struct work_struct send_csa_msg_wk; wait_queue_head_t get_ownership_wq; struct iwl_mei_shared_mem_ptrs shared_mem; struct mei_cl_device *cldev; struct iwl_mei_nvm *nvm; struct iwl_mei_filters __rcu *filters; bool got_ownership; bool amt_enabled; bool csa_throttled; bool csme_taking_ownership; bool link_prot_state; bool device_down; struct delayed_work csa_throttle_end_wk; wait_queue_head_t pldr_wq; bool pldr_active; spinlock_t data_q_lock; struct work_struct netdev_work; struct delayed_work ownership_dwork; atomic_t sap_seq_no; atomic_t seq_no; struct dentry *dbgfs_dir; }; /** * struct iwl_mei_cache - cache for the parameters from iwlwifi * @ops: Callbacks to iwlwifi. * @netdev: The netdev that will be used to transmit / receive packets. * @conn_info: The connection info message triggered by iwlwifi's association. * @power_limit: pointer to an array of 10 elements (le16) represents the power * restrictions per chain. * @rf_kill: rf kill state. * @mcc: MCC info * @mac_address: interface MAC address. * @nvm_address: NVM MAC address. * @priv: A pointer to iwlwifi. * * This used to cache the configurations coming from iwlwifi's way. The data * is cached here so that we can buffer the configuration even if we don't have * a bind from the mei bus and hence, on iwl_mei structure. */ struct iwl_mei_cache { const struct iwl_mei_ops *ops; struct net_device __rcu *netdev; const struct iwl_sap_notif_connection_info *conn_info; const __le16 *power_limit; u32 rf_kill; u16 mcc; u8 mac_address[6]; u8 nvm_address[6]; void *priv; }; static struct iwl_mei_cache iwl_mei_cache = { .rf_kill = SAP_HW_RFKILL_DEASSERTED | SAP_SW_RFKILL_DEASSERTED }; static void iwl_mei_free_shared_mem(struct mei_cl_device *cldev) { struct iwl_mei *mei = mei_cldev_get_drvdata(cldev); if (mei_cldev_dma_unmap(cldev)) dev_err(&cldev->dev, "Couldn't unmap the shared mem properly\n"); memset(&mei->shared_mem, 0, sizeof(mei->shared_mem)); } #define HBM_DMA_BUF_ID_WLAN 1 static int iwl_mei_alloc_shared_mem(struct mei_cl_device *cldev) { struct iwl_mei *mei = mei_cldev_get_drvdata(cldev); struct iwl_mei_shared_mem_ptrs *mem = &mei->shared_mem; mem->ctrl = mei_cldev_dma_map(cldev, HBM_DMA_BUF_ID_WLAN, IWL_MEI_SAP_SHARED_MEM_SZ); if (IS_ERR(mem->ctrl)) { int ret = PTR_ERR(mem->ctrl); mem->ctrl = NULL; return ret; } memset(mem->ctrl, 0, IWL_MEI_SAP_SHARED_MEM_SZ); return 0; } static void iwl_mei_init_shared_mem(struct iwl_mei *mei) { struct iwl_mei_shared_mem_ptrs *mem = &mei->shared_mem; struct iwl_sap_dir *h2m; struct iwl_sap_dir *m2h; int dir, queue; u8 *q_head; mem->ctrl->sap_id = cpu_to_le32(SAP_CONTROL_BLOCK_ID); mem->ctrl->size = cpu_to_le32(sizeof(*mem->ctrl)); h2m = &mem->ctrl->dir[SAP_DIRECTION_HOST_TO_ME]; m2h = &mem->ctrl->dir[SAP_DIRECTION_ME_TO_HOST]; h2m->q_ctrl_blk[SAP_QUEUE_IDX_DATA].size = cpu_to_le32(SAP_H2M_DATA_Q_SZ); h2m->q_ctrl_blk[SAP_QUEUE_IDX_NOTIF].size = cpu_to_le32(SAP_H2M_NOTIF_Q_SZ); m2h->q_ctrl_blk[SAP_QUEUE_IDX_DATA].size = cpu_to_le32(SAP_M2H_DATA_Q_SZ); m2h->q_ctrl_blk[SAP_QUEUE_IDX_NOTIF].size = cpu_to_le32(SAP_M2H_NOTIF_Q_SZ); /* q_head points to the start of the first queue */ q_head = (void *)(mem->ctrl + 1); /* Initialize the queue heads */ for (dir = 0; dir < SAP_DIRECTION_MAX; dir++) { for (queue = 0; queue < SAP_QUEUE_IDX_MAX; queue++) { mem->q_head[dir][queue] = q_head; q_head += le32_to_cpu(mem->ctrl->dir[dir].q_ctrl_blk[queue].size); mem->q_size[dir][queue] = le32_to_cpu(mem->ctrl->dir[dir].q_ctrl_blk[queue].size); } } *(__le32 *)q_head = cpu_to_le32(SAP_CONTROL_BLOCK_ID); } static ssize_t iwl_mei_write_cyclic_buf(struct mei_cl_device *cldev, struct iwl_sap_q_ctrl_blk *notif_q, u8 *q_head, const struct iwl_sap_hdr *hdr, u32 q_sz) { u32 rd = le32_to_cpu(READ_ONCE(notif_q->rd_ptr)); u32 wr = le32_to_cpu(READ_ONCE(notif_q->wr_ptr)); size_t room_in_buf; size_t tx_sz = sizeof(*hdr) + le16_to_cpu(hdr->len); if (rd > q_sz || wr > q_sz) { dev_err(&cldev->dev, "Pointers are past the end of the buffer\n"); return -EINVAL; } room_in_buf = wr >= rd ? q_sz - wr + rd : rd - wr; /* we don't have enough room for the data to write */ if (room_in_buf < tx_sz) { dev_err(&cldev->dev, "Not enough room in the buffer\n"); return -ENOSPC; } if (wr + tx_sz <= q_sz) { memcpy(q_head + wr, hdr, tx_sz); } else { memcpy(q_head + wr, hdr, q_sz - wr); memcpy(q_head, (const u8 *)hdr + q_sz - wr, tx_sz - (q_sz - wr)); } WRITE_ONCE(notif_q->wr_ptr, cpu_to_le32((wr + tx_sz) % q_sz)); return 0; } static bool iwl_mei_host_to_me_data_pending(const struct iwl_mei *mei) { struct iwl_sap_q_ctrl_blk *notif_q; struct iwl_sap_dir *dir; dir = &mei->shared_mem.ctrl->dir[SAP_DIRECTION_HOST_TO_ME]; notif_q = &dir->q_ctrl_blk[SAP_QUEUE_IDX_DATA]; if (READ_ONCE(notif_q->wr_ptr) != READ_ONCE(notif_q->rd_ptr)) return true; notif_q = &dir->q_ctrl_blk[SAP_QUEUE_IDX_NOTIF]; return READ_ONCE(notif_q->wr_ptr) != READ_ONCE(notif_q->rd_ptr); } static int iwl_mei_send_check_shared_area(struct mei_cl_device *cldev) { struct iwl_mei *mei = mei_cldev_get_drvdata(cldev); struct iwl_sap_me_msg_start msg = { .hdr.type = cpu_to_le32(SAP_ME_MSG_CHECK_SHARED_AREA), .hdr.seq_num = cpu_to_le32(atomic_inc_return(&mei->seq_no)), }; int ret; lockdep_assert_held(&iwl_mei_mutex); if (mei->csa_throttled) return 0; trace_iwlmei_me_msg(&msg.hdr, true); ret = mei_cldev_send(cldev, (void *)&msg, sizeof(msg)); if (ret != sizeof(msg)) { dev_err(&cldev->dev, "failed to send the SAP_ME_MSG_CHECK_SHARED_AREA message %d\n", ret); return ret; } mei->csa_throttled = true; schedule_delayed_work(&mei->csa_throttle_end_wk, msecs_to_jiffies(100)); return 0; } static void iwl_mei_csa_throttle_end_wk(struct work_struct *wk) { struct iwl_mei *mei = container_of(wk, struct iwl_mei, csa_throttle_end_wk.work); mutex_lock(&iwl_mei_mutex); mei->csa_throttled = false; if (iwl_mei_host_to_me_data_pending(mei)) iwl_mei_send_check_shared_area(mei->cldev); mutex_unlock(&iwl_mei_mutex); } static int iwl_mei_send_sap_msg_payload(struct mei_cl_device *cldev, struct iwl_sap_hdr *hdr) { struct iwl_mei *mei = mei_cldev_get_drvdata(cldev); struct iwl_sap_q_ctrl_blk *notif_q; struct iwl_sap_dir *dir; void *q_head; u32 q_sz; int ret; lockdep_assert_held(&iwl_mei_mutex); if (!mei->shared_mem.ctrl) { dev_err(&cldev->dev, "No shared memory, can't send any SAP message\n"); return -EINVAL; } if (!iwl_mei_is_connected()) { dev_err(&cldev->dev, "Can't send a SAP message if we're not connected\n"); return -ENODEV; } hdr->seq_num = cpu_to_le32(atomic_inc_return(&mei->sap_seq_no)); dev_dbg(&cldev->dev, "Sending %d\n", hdr->type); dir = &mei->shared_mem.ctrl->dir[SAP_DIRECTION_HOST_TO_ME]; notif_q = &dir->q_ctrl_blk[SAP_QUEUE_IDX_NOTIF]; q_head = mei->shared_mem.q_head[SAP_DIRECTION_HOST_TO_ME][SAP_QUEUE_IDX_NOTIF]; q_sz = mei->shared_mem.q_size[SAP_DIRECTION_HOST_TO_ME][SAP_QUEUE_IDX_NOTIF]; ret = iwl_mei_write_cyclic_buf(q_head, notif_q, q_head, hdr, q_sz); if (ret < 0) return ret; trace_iwlmei_sap_cmd(hdr, true); return iwl_mei_send_check_shared_area(cldev); } void iwl_mei_add_data_to_ring(struct sk_buff *skb, bool cb_tx) { struct iwl_sap_q_ctrl_blk *notif_q; struct iwl_sap_dir *dir; struct iwl_mei *mei; size_t room_in_buf; size_t tx_sz; size_t hdr_sz; u32 q_sz; u32 rd; u32 wr; u8 *q_head; if (!iwl_mei_global_cldev) return; mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); /* * We access this path for Rx packets (the more common case) * and from Tx path when we send DHCP packets, the latter is * very unlikely. * Take the lock already here to make sure we see that remove() * might have cleared the IWL_MEI_STATUS_SAP_CONNECTED bit. */ spin_lock_bh(&mei->data_q_lock); if (!iwl_mei_is_connected()) { spin_unlock_bh(&mei->data_q_lock); return; } /* * We are in a RCU critical section and the remove from the CSME bus * which would free this memory waits for the readers to complete (this * is done in netdev_rx_handler_unregister). */ dir = &mei->shared_mem.ctrl->dir[SAP_DIRECTION_HOST_TO_ME]; notif_q = &dir->q_ctrl_blk[SAP_QUEUE_IDX_DATA]; q_head = mei->shared_mem.q_head[SAP_DIRECTION_HOST_TO_ME][SAP_QUEUE_IDX_DATA]; q_sz = mei->shared_mem.q_size[SAP_DIRECTION_HOST_TO_ME][SAP_QUEUE_IDX_DATA]; rd = le32_to_cpu(READ_ONCE(notif_q->rd_ptr)); wr = le32_to_cpu(READ_ONCE(notif_q->wr_ptr)); hdr_sz = cb_tx ? sizeof(struct iwl_sap_cb_data) : sizeof(struct iwl_sap_hdr); tx_sz = skb->len + hdr_sz; if (rd > q_sz || wr > q_sz) { dev_err(&mei->cldev->dev, "can't write the data: pointers are past the end of the buffer\n"); goto out; } room_in_buf = wr >= rd ? q_sz - wr + rd : rd - wr; /* we don't have enough room for the data to write */ if (room_in_buf < tx_sz) { dev_err(&mei->cldev->dev, "Not enough room in the buffer for this data\n"); goto out; } if (skb_headroom(skb) < hdr_sz) { dev_err(&mei->cldev->dev, "Not enough headroom in the skb to write the SAP header\n"); goto out; } if (cb_tx) { struct iwl_sap_cb_data *cb_hdr = skb_push(skb, sizeof(*cb_hdr)); memset(cb_hdr, 0, sizeof(*cb_hdr)); cb_hdr->hdr.type = cpu_to_le16(SAP_MSG_CB_DATA_PACKET); cb_hdr->hdr.len = cpu_to_le16(skb->len - sizeof(cb_hdr->hdr)); cb_hdr->hdr.seq_num = cpu_to_le32(atomic_inc_return(&mei->sap_seq_no)); cb_hdr->to_me_filt_status = cpu_to_le32(BIT(CB_TX_DHCP_FILT_IDX)); cb_hdr->data_len = cpu_to_le32(skb->len - sizeof(*cb_hdr)); trace_iwlmei_sap_data(skb, IWL_SAP_TX_DHCP); } else { struct iwl_sap_hdr *hdr = skb_push(skb, sizeof(*hdr)); hdr->type = cpu_to_le16(SAP_MSG_DATA_PACKET); hdr->len = cpu_to_le16(skb->len - sizeof(*hdr)); hdr->seq_num = cpu_to_le32(atomic_inc_return(&mei->sap_seq_no)); trace_iwlmei_sap_data(skb, IWL_SAP_TX_DATA_FROM_AIR); } if (wr + tx_sz <= q_sz) { skb_copy_bits(skb, 0, q_head + wr, tx_sz); } else { skb_copy_bits(skb, 0, q_head + wr, q_sz - wr); skb_copy_bits(skb, q_sz - wr, q_head, tx_sz - (q_sz - wr)); } WRITE_ONCE(notif_q->wr_ptr, cpu_to_le32((wr + tx_sz) % q_sz)); out: spin_unlock_bh(&mei->data_q_lock); } static int iwl_mei_send_sap_msg(struct mei_cl_device *cldev, u16 type) { struct iwl_sap_hdr msg = { .type = cpu_to_le16(type), }; return iwl_mei_send_sap_msg_payload(cldev, &msg); } static void iwl_mei_send_csa_msg_wk(struct work_struct *wk) { struct iwl_mei *mei = container_of(wk, struct iwl_mei, send_csa_msg_wk); if (!iwl_mei_is_connected()) return; mutex_lock(&iwl_mei_mutex); iwl_mei_send_check_shared_area(mei->cldev); mutex_unlock(&iwl_mei_mutex); } /* Called in a RCU read critical section from netif_receive_skb */ static rx_handler_result_t iwl_mei_rx_handler(struct sk_buff **pskb) { struct sk_buff *skb = *pskb; struct iwl_mei *mei = rcu_dereference(skb->dev->rx_handler_data); struct iwl_mei_filters *filters = rcu_dereference(mei->filters); bool rx_for_csme = false; rx_handler_result_t res; /* * remove() unregisters this handler and synchronize_net, so this * should never happen. */ if (!iwl_mei_is_connected()) { dev_err(&mei->cldev->dev, "Got an Rx packet, but we're not connected to SAP?\n"); return RX_HANDLER_PASS; } if (filters) res = iwl_mei_rx_filter(skb, &filters->filters, &rx_for_csme); else res = RX_HANDLER_PASS; /* * The data is already on the ring of the shared area, all we * need to do is to tell the CSME firmware to check what we have * there. */ if (rx_for_csme) schedule_work(&mei->send_csa_msg_wk); if (res != RX_HANDLER_PASS) { trace_iwlmei_sap_data(skb, IWL_SAP_RX_DATA_DROPPED_FROM_AIR); dev_kfree_skb(skb); } return res; } static void iwl_mei_netdev_work(struct work_struct *wk) { struct iwl_mei *mei = container_of(wk, struct iwl_mei, netdev_work); struct net_device *netdev; /* * First take rtnl and only then the mutex to avoid an ABBA * with iwl_mei_set_netdev() */ rtnl_lock(); mutex_lock(&iwl_mei_mutex); netdev = rcu_dereference_protected(iwl_mei_cache.netdev, lockdep_is_held(&iwl_mei_mutex)); if (netdev) { if (mei->amt_enabled) netdev_rx_handler_register(netdev, iwl_mei_rx_handler, mei); else netdev_rx_handler_unregister(netdev); } mutex_unlock(&iwl_mei_mutex); rtnl_unlock(); } static void iwl_mei_handle_rx_start_ok(struct mei_cl_device *cldev, const struct iwl_sap_me_msg_start_ok *rsp, ssize_t len) { if (len != sizeof(*rsp)) { dev_err(&cldev->dev, "got invalid SAP_ME_MSG_START_OK from CSME firmware\n"); dev_err(&cldev->dev, "size is incorrect: %zd instead of %zu\n", len, sizeof(*rsp)); return; } if (rsp->supported_version != SAP_VERSION) { dev_err(&cldev->dev, "didn't get the expected version: got %d\n", rsp->supported_version); return; } mutex_lock(&iwl_mei_mutex); set_bit(IWL_MEI_STATUS_SAP_CONNECTED, &iwl_mei_status); /* * We'll receive AMT_STATE SAP message in a bit and * that will continue the flow */ mutex_unlock(&iwl_mei_mutex); } static void iwl_mei_handle_csme_filters(struct mei_cl_device *cldev, const struct iwl_sap_csme_filters *filters) { struct iwl_mei *mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); struct iwl_mei_filters *new_filters; struct iwl_mei_filters *old_filters; old_filters = rcu_dereference_protected(mei->filters, lockdep_is_held(&iwl_mei_mutex)); new_filters = kzalloc(sizeof(*new_filters), GFP_KERNEL); if (!new_filters) return; /* Copy the OOB filters */ new_filters->filters = filters->filters; rcu_assign_pointer(mei->filters, new_filters); if (old_filters) kfree_rcu(old_filters, rcu_head); } static void iwl_mei_handle_conn_status(struct mei_cl_device *cldev, const struct iwl_sap_notif_conn_status *status) { struct iwl_mei *mei = mei_cldev_get_drvdata(cldev); struct iwl_mei_conn_info conn_info = { .lp_state = le32_to_cpu(status->link_prot_state), .ssid_len = le32_to_cpu(status->conn_info.ssid_len), .channel = status->conn_info.channel, .band = status->conn_info.band, .auth_mode = le32_to_cpu(status->conn_info.auth_mode), .pairwise_cipher = le32_to_cpu(status->conn_info.pairwise_cipher), }; if (!iwl_mei_cache.ops || conn_info.ssid_len > ARRAY_SIZE(conn_info.ssid)) return; memcpy(conn_info.ssid, status->conn_info.ssid, conn_info.ssid_len); ether_addr_copy(conn_info.bssid, status->conn_info.bssid); iwl_mei_cache.ops->me_conn_status(iwl_mei_cache.priv, &conn_info); mei->link_prot_state = status->link_prot_state; /* * Update the Rfkill state in case the host does not own the device: * if we are in Link Protection, ask to not touch the device, else, * unblock rfkill. * If the host owns the device, inform the user space whether it can * roam. */ if (mei->got_ownership) iwl_mei_cache.ops->roaming_forbidden(iwl_mei_cache.priv, status->link_prot_state); else iwl_mei_cache.ops->rfkill(iwl_mei_cache.priv, status->link_prot_state, false); } static void iwl_mei_set_init_conf(struct iwl_mei *mei) { struct iwl_sap_notif_host_link_up link_msg = { .hdr.type = cpu_to_le16(SAP_MSG_NOTIF_HOST_LINK_UP), .hdr.len = cpu_to_le16(sizeof(link_msg) - sizeof(link_msg.hdr)), }; struct iwl_sap_notif_country_code mcc_msg = { .hdr.type = cpu_to_le16(SAP_MSG_NOTIF_COUNTRY_CODE), .hdr.len = cpu_to_le16(sizeof(mcc_msg) - sizeof(mcc_msg.hdr)), .mcc = cpu_to_le16(iwl_mei_cache.mcc), }; struct iwl_sap_notif_sar_limits sar_msg = { .hdr.type = cpu_to_le16(SAP_MSG_NOTIF_SAR_LIMITS), .hdr.len = cpu_to_le16(sizeof(sar_msg) - sizeof(sar_msg.hdr)), }; struct iwl_sap_notif_host_nic_info nic_info_msg = { .hdr.type = cpu_to_le16(SAP_MSG_NOTIF_NIC_INFO), .hdr.len = cpu_to_le16(sizeof(nic_info_msg) - sizeof(nic_info_msg.hdr)), }; struct iwl_sap_msg_dw rfkill_msg = { .hdr.type = cpu_to_le16(SAP_MSG_NOTIF_RADIO_STATE), .hdr.len = cpu_to_le16(sizeof(rfkill_msg) - sizeof(rfkill_msg.hdr)), .val = cpu_to_le32(iwl_mei_cache.rf_kill), }; /* wifi driver has registered already */ if (iwl_mei_cache.ops) { iwl_mei_send_sap_msg(mei->cldev, SAP_MSG_NOTIF_WIFIDR_UP); iwl_mei_cache.ops->sap_connected(iwl_mei_cache.priv); } iwl_mei_send_sap_msg(mei->cldev, SAP_MSG_NOTIF_WHO_OWNS_NIC); if (iwl_mei_cache.conn_info) { link_msg.conn_info = *iwl_mei_cache.conn_info; iwl_mei_send_sap_msg_payload(mei->cldev, &link_msg.hdr); } iwl_mei_send_sap_msg_payload(mei->cldev, &mcc_msg.hdr); if (iwl_mei_cache.power_limit) { memcpy(sar_msg.sar_chain_info_table, iwl_mei_cache.power_limit, sizeof(sar_msg.sar_chain_info_table)); iwl_mei_send_sap_msg_payload(mei->cldev, &sar_msg.hdr); } if (is_valid_ether_addr(iwl_mei_cache.mac_address)) { ether_addr_copy(nic_info_msg.mac_address, iwl_mei_cache.mac_address); ether_addr_copy(nic_info_msg.nvm_address, iwl_mei_cache.nvm_address); iwl_mei_send_sap_msg_payload(mei->cldev, &nic_info_msg.hdr); } iwl_mei_send_sap_msg_payload(mei->cldev, &rfkill_msg.hdr); } static void iwl_mei_handle_amt_state(struct mei_cl_device *cldev, const struct iwl_sap_msg_dw *dw) { struct iwl_mei *mei = mei_cldev_get_drvdata(cldev); mutex_lock(&iwl_mei_mutex); if (mei->amt_enabled == !!le32_to_cpu(dw->val)) goto out; mei->amt_enabled = dw->val; if (mei->amt_enabled) iwl_mei_set_init_conf(mei); else if (iwl_mei_cache.ops) iwl_mei_cache.ops->rfkill(iwl_mei_cache.priv, false, false); schedule_work(&mei->netdev_work); out: mutex_unlock(&iwl_mei_mutex); } static void iwl_mei_handle_nic_owner(struct mei_cl_device *cldev, const struct iwl_sap_msg_dw *dw) { struct iwl_mei *mei = mei_cldev_get_drvdata(cldev); mei->got_ownership = dw->val != cpu_to_le32(SAP_NIC_OWNER_ME); } static void iwl_mei_handle_can_release_ownership(struct mei_cl_device *cldev, const void *payload) { /* We can get ownership and driver is registered, go ahead */ if (iwl_mei_cache.ops) iwl_mei_send_sap_msg(cldev, SAP_MSG_NOTIF_HOST_ASKS_FOR_NIC_OWNERSHIP); } static void iwl_mei_handle_csme_taking_ownership(struct mei_cl_device *cldev, const void *payload) { struct iwl_mei *mei = mei_cldev_get_drvdata(cldev); dev_info(&cldev->dev, "CSME takes ownership\n"); mei->got_ownership = false; if (iwl_mei_cache.ops && !mei->device_down) { /* * Remember to send CSME_OWNERSHIP_CONFIRMED when the wifi * driver is finished taking the device down. */ mei->csme_taking_ownership = true; iwl_mei_cache.ops->rfkill(iwl_mei_cache.priv, true, true); } else { iwl_mei_send_sap_msg(cldev, SAP_MSG_NOTIF_CSME_OWNERSHIP_CONFIRMED); schedule_delayed_work(&mei->ownership_dwork, MEI_OWNERSHIP_RETAKE_TIMEOUT_MS); } } static void iwl_mei_handle_nvm(struct mei_cl_device *cldev, const struct iwl_sap_nvm *sap_nvm) { struct iwl_mei *mei = mei_cldev_get_drvdata(cldev); const struct iwl_mei_nvm *mei_nvm = (const void *)sap_nvm; int i; kfree(mei->nvm); mei->nvm = kzalloc(sizeof(*mei_nvm), GFP_KERNEL); if (!mei->nvm) return; ether_addr_copy(mei->nvm->hw_addr, sap_nvm->hw_addr); mei->nvm->n_hw_addrs = sap_nvm->n_hw_addrs; mei->nvm->radio_cfg = le32_to_cpu(sap_nvm->radio_cfg); mei->nvm->caps = le32_to_cpu(sap_nvm->caps); mei->nvm->nvm_version = le32_to_cpu(sap_nvm->nvm_version); for (i = 0; i < ARRAY_SIZE(mei->nvm->channels); i++) mei->nvm->channels[i] = le32_to_cpu(sap_nvm->channels[i]); wake_up_all(&mei->get_nvm_wq); } static void iwl_mei_handle_rx_host_own_req(struct mei_cl_device *cldev, const struct iwl_sap_msg_dw *dw) { struct iwl_mei *mei = mei_cldev_get_drvdata(cldev); /* * This means that we can't use the wifi device right now, CSME is not * ready to let us use it. */ if (!dw->val) { dev_info(&cldev->dev, "Ownership req denied\n"); return; } mei->got_ownership = true; wake_up_all(&mei->get_ownership_wq); iwl_mei_send_sap_msg(cldev, SAP_MSG_NOTIF_HOST_OWNERSHIP_CONFIRMED); /* We can now start the connection, unblock rfkill */ if (iwl_mei_cache.ops) iwl_mei_cache.ops->rfkill(iwl_mei_cache.priv, false, false); } static void iwl_mei_handle_pldr_ack(struct mei_cl_device *cldev, const struct iwl_sap_pldr_ack_data *ack) { struct iwl_mei *mei = mei_cldev_get_drvdata(cldev); mei->pldr_active = le32_to_cpu(ack->status) == SAP_PLDR_STATUS_SUCCESS; wake_up_all(&mei->pldr_wq); } static void iwl_mei_handle_ping(struct mei_cl_device *cldev, const struct iwl_sap_hdr *hdr) { iwl_mei_send_sap_msg(cldev, SAP_MSG_NOTIF_PONG); } static void iwl_mei_handle_sap_msg(struct mei_cl_device *cldev, const struct iwl_sap_hdr *hdr) { u16 len = le16_to_cpu(hdr->len) + sizeof(*hdr); u16 type = le16_to_cpu(hdr->type); dev_dbg(&cldev->dev, "Got a new SAP message: type %d, len %d, seq %d\n", le16_to_cpu(hdr->type), len, le32_to_cpu(hdr->seq_num)); #define SAP_MSG_HANDLER(_cmd, _handler, _sz) \ case SAP_MSG_NOTIF_ ## _cmd: \ if (len < _sz) { \ dev_err(&cldev->dev, \ "Bad size for %d: %u < %u\n", \ le16_to_cpu(hdr->type), \ (unsigned int)len, \ (unsigned int)_sz); \ break; \ } \ mutex_lock(&iwl_mei_mutex); \ _handler(cldev, (const void *)hdr); \ mutex_unlock(&iwl_mei_mutex); \ break #define SAP_MSG_HANDLER_NO_LOCK(_cmd, _handler, _sz) \ case SAP_MSG_NOTIF_ ## _cmd: \ if (len < _sz) { \ dev_err(&cldev->dev, \ "Bad size for %d: %u < %u\n", \ le16_to_cpu(hdr->type), \ (unsigned int)len, \ (unsigned int)_sz); \ break; \ } \ _handler(cldev, (const void *)hdr); \ break #define SAP_MSG_HANDLER_NO_HANDLER(_cmd, _sz) \ case SAP_MSG_NOTIF_ ## _cmd: \ if (len < _sz) { \ dev_err(&cldev->dev, \ "Bad size for %d: %u < %u\n", \ le16_to_cpu(hdr->type), \ (unsigned int)len, \ (unsigned int)_sz); \ break; \ } \ break switch (type) { SAP_MSG_HANDLER(PING, iwl_mei_handle_ping, 0); SAP_MSG_HANDLER(CSME_FILTERS, iwl_mei_handle_csme_filters, sizeof(struct iwl_sap_csme_filters)); SAP_MSG_HANDLER(CSME_CONN_STATUS, iwl_mei_handle_conn_status, sizeof(struct iwl_sap_notif_conn_status)); SAP_MSG_HANDLER_NO_LOCK(AMT_STATE, iwl_mei_handle_amt_state, sizeof(struct iwl_sap_msg_dw)); SAP_MSG_HANDLER_NO_HANDLER(PONG, 0); SAP_MSG_HANDLER(NVM, iwl_mei_handle_nvm, sizeof(struct iwl_sap_nvm)); SAP_MSG_HANDLER(CSME_REPLY_TO_HOST_OWNERSHIP_REQ, iwl_mei_handle_rx_host_own_req, sizeof(struct iwl_sap_msg_dw)); SAP_MSG_HANDLER(NIC_OWNER, iwl_mei_handle_nic_owner, sizeof(struct iwl_sap_msg_dw)); SAP_MSG_HANDLER(CSME_CAN_RELEASE_OWNERSHIP, iwl_mei_handle_can_release_ownership, 0); SAP_MSG_HANDLER(CSME_TAKING_OWNERSHIP, iwl_mei_handle_csme_taking_ownership, 0); SAP_MSG_HANDLER(PLDR_ACK, iwl_mei_handle_pldr_ack, sizeof(struct iwl_sap_pldr_ack_data)); default: /* * This is not really an error, there are message that we decided * to ignore, yet, it is useful to be able to leave a note if debug * is enabled. */ dev_dbg(&cldev->dev, "Unsupported message: type %d, len %d\n", le16_to_cpu(hdr->type), len); } #undef SAP_MSG_HANDLER #undef SAP_MSG_HANDLER_NO_LOCK } static void iwl_mei_read_from_q(const u8 *q_head, u32 q_sz, u32 *_rd, u32 wr, void *_buf, u32 len) { u8 *buf = _buf; u32 rd = *_rd; if (rd + len <= q_sz) { memcpy(buf, q_head + rd, len); rd += len; } else { memcpy(buf, q_head + rd, q_sz - rd); memcpy(buf + q_sz - rd, q_head, len - (q_sz - rd)); rd = len - (q_sz - rd); } *_rd = rd; } #define QOS_HDR_IV_SNAP_LEN (sizeof(struct ieee80211_qos_hdr) + \ IEEE80211_TKIP_IV_LEN + \ sizeof(rfc1042_header) + ETH_TLEN) static void iwl_mei_handle_sap_data(struct mei_cl_device *cldev, const u8 *q_head, u32 q_sz, u32 rd, u32 wr, ssize_t valid_rx_sz, struct sk_buff_head *tx_skbs) { struct iwl_sap_hdr hdr; struct net_device *netdev = rcu_dereference_protected(iwl_mei_cache.netdev, lockdep_is_held(&iwl_mei_mutex)); if (!netdev) return; while (valid_rx_sz >= sizeof(hdr)) { struct ethhdr *ethhdr; unsigned char *data; struct sk_buff *skb; u16 len; iwl_mei_read_from_q(q_head, q_sz, &rd, wr, &hdr, sizeof(hdr)); valid_rx_sz -= sizeof(hdr); len = le16_to_cpu(hdr.len); if (valid_rx_sz < len) { dev_err(&cldev->dev, "Data queue is corrupted: valid data len %zd, len %d\n", valid_rx_sz, len); break; } if (len < sizeof(*ethhdr)) { dev_err(&cldev->dev, "Data len is smaller than an ethernet header? len = %d\n", len); } valid_rx_sz -= len; if (le16_to_cpu(hdr.type) != SAP_MSG_DATA_PACKET) { dev_err(&cldev->dev, "Unsupported Rx data: type %d, len %d\n", le16_to_cpu(hdr.type), len); continue; } /* We need enough room for the WiFi header + SNAP + IV */ skb = netdev_alloc_skb(netdev, len + QOS_HDR_IV_SNAP_LEN); if (!skb) continue; skb_reserve(skb, QOS_HDR_IV_SNAP_LEN); ethhdr = skb_push(skb, sizeof(*ethhdr)); iwl_mei_read_from_q(q_head, q_sz, &rd, wr, ethhdr, sizeof(*ethhdr)); len -= sizeof(*ethhdr); skb_reset_mac_header(skb); skb_reset_network_header(skb); skb->protocol = ethhdr->h_proto; data = skb_put(skb, len); iwl_mei_read_from_q(q_head, q_sz, &rd, wr, data, len); /* * Enqueue the skb here so that it can be sent later when we * do not hold the mutex. TX'ing a packet with a mutex held is * possible, but it wouldn't be nice to forbid the TX path to * call any of iwlmei's functions, since every API from iwlmei * needs the mutex. */ __skb_queue_tail(tx_skbs, skb); } } static void iwl_mei_handle_sap_rx_cmd(struct mei_cl_device *cldev, const u8 *q_head, u32 q_sz, u32 rd, u32 wr, ssize_t valid_rx_sz) { struct page *p = alloc_page(GFP_KERNEL); struct iwl_sap_hdr *hdr; if (!p) return; hdr = page_address(p); while (valid_rx_sz >= sizeof(*hdr)) { u16 len; iwl_mei_read_from_q(q_head, q_sz, &rd, wr, hdr, sizeof(*hdr)); valid_rx_sz -= sizeof(*hdr); len = le16_to_cpu(hdr->len); if (valid_rx_sz < len) break; iwl_mei_read_from_q(q_head, q_sz, &rd, wr, hdr + 1, len); trace_iwlmei_sap_cmd(hdr, false); iwl_mei_handle_sap_msg(cldev, hdr); valid_rx_sz -= len; } /* valid_rx_sz must be 0 now... */ if (valid_rx_sz) dev_err(&cldev->dev, "More data in the buffer although we read it all\n"); __free_page(p); } static void iwl_mei_handle_sap_rx(struct mei_cl_device *cldev, struct iwl_sap_q_ctrl_blk *notif_q, const u8 *q_head, struct sk_buff_head *skbs, u32 q_sz) { u32 rd = le32_to_cpu(READ_ONCE(notif_q->rd_ptr)); u32 wr = le32_to_cpu(READ_ONCE(notif_q->wr_ptr)); ssize_t valid_rx_sz; if (rd > q_sz || wr > q_sz) { dev_err(&cldev->dev, "Pointers are past the buffer limit\n"); return; } if (rd == wr) return; valid_rx_sz = wr > rd ? wr - rd : q_sz - rd + wr; if (skbs) iwl_mei_handle_sap_data(cldev, q_head, q_sz, rd, wr, valid_rx_sz, skbs); else iwl_mei_handle_sap_rx_cmd(cldev, q_head, q_sz, rd, wr, valid_rx_sz); /* Increment the read pointer to point to the write pointer */ WRITE_ONCE(notif_q->rd_ptr, cpu_to_le32(wr)); } static void iwl_mei_handle_check_shared_area(struct mei_cl_device *cldev) { struct iwl_mei *mei = mei_cldev_get_drvdata(cldev); struct iwl_sap_q_ctrl_blk *notif_q; struct sk_buff_head tx_skbs; struct iwl_sap_dir *dir; void *q_head; u32 q_sz; if (!mei->shared_mem.ctrl) return; dir = &mei->shared_mem.ctrl->dir[SAP_DIRECTION_ME_TO_HOST]; notif_q = &dir->q_ctrl_blk[SAP_QUEUE_IDX_NOTIF]; q_head = mei->shared_mem.q_head[SAP_DIRECTION_ME_TO_HOST][SAP_QUEUE_IDX_NOTIF]; q_sz = mei->shared_mem.q_size[SAP_DIRECTION_ME_TO_HOST][SAP_QUEUE_IDX_NOTIF]; /* * Do not hold the mutex here, but rather each and every message * handler takes it. * This allows message handlers to take it at a certain time. */ iwl_mei_handle_sap_rx(cldev, notif_q, q_head, NULL, q_sz); mutex_lock(&iwl_mei_mutex); dir = &mei->shared_mem.ctrl->dir[SAP_DIRECTION_ME_TO_HOST]; notif_q = &dir->q_ctrl_blk[SAP_QUEUE_IDX_DATA]; q_head = mei->shared_mem.q_head[SAP_DIRECTION_ME_TO_HOST][SAP_QUEUE_IDX_DATA]; q_sz = mei->shared_mem.q_size[SAP_DIRECTION_ME_TO_HOST][SAP_QUEUE_IDX_DATA]; __skb_queue_head_init(&tx_skbs); iwl_mei_handle_sap_rx(cldev, notif_q, q_head, &tx_skbs, q_sz); if (skb_queue_empty(&tx_skbs)) { mutex_unlock(&iwl_mei_mutex); return; } /* * Take the RCU read lock before we unlock the mutex to make sure that * even if the netdev is replaced by another non-NULL netdev right after * we unlock the mutex, the old netdev will still be valid when we * transmit the frames. We can't allow to replace the netdev here because * the skbs hold a pointer to the netdev. */ rcu_read_lock(); mutex_unlock(&iwl_mei_mutex); if (!rcu_access_pointer(iwl_mei_cache.netdev)) { dev_err(&cldev->dev, "Can't Tx without a netdev\n"); skb_queue_purge(&tx_skbs); goto out; } while (!skb_queue_empty(&tx_skbs)) { struct sk_buff *skb = __skb_dequeue(&tx_skbs); trace_iwlmei_sap_data(skb, IWL_SAP_RX_DATA_TO_AIR); dev_queue_xmit(skb); } out: rcu_read_unlock(); } static void iwl_mei_rx(struct mei_cl_device *cldev) { struct iwl_sap_me_msg_hdr *hdr; u8 msg[100]; ssize_t ret; ret = mei_cldev_recv(cldev, (u8 *)&msg, sizeof(msg)); if (ret < 0) { dev_err(&cldev->dev, "failed to receive data: %zd\n", ret); return; } if (ret == 0) { dev_err(&cldev->dev, "got an empty response\n"); return; } hdr = (void *)msg; trace_iwlmei_me_msg(hdr, false); switch (le32_to_cpu(hdr->type)) { case SAP_ME_MSG_START_OK: BUILD_BUG_ON(sizeof(struct iwl_sap_me_msg_start_ok) > sizeof(msg)); iwl_mei_handle_rx_start_ok(cldev, (void *)msg, ret); break; case SAP_ME_MSG_CHECK_SHARED_AREA: iwl_mei_handle_check_shared_area(cldev); break; default: dev_err(&cldev->dev, "got a RX notification: %d\n", le32_to_cpu(hdr->type)); break; } } static int iwl_mei_send_start(struct mei_cl_device *cldev) { struct iwl_mei *mei = mei_cldev_get_drvdata(cldev); struct iwl_sap_me_msg_start msg = { .hdr.type = cpu_to_le32(SAP_ME_MSG_START), .hdr.seq_num = cpu_to_le32(atomic_inc_return(&mei->seq_no)), .hdr.len = cpu_to_le32(sizeof(msg)), .supported_versions[0] = SAP_VERSION, .init_data_seq_num = cpu_to_le16(0x100), .init_notif_seq_num = cpu_to_le16(0x800), }; int ret; trace_iwlmei_me_msg(&msg.hdr, true); ret = mei_cldev_send(cldev, (void *)&msg, sizeof(msg)); if (ret != sizeof(msg)) { dev_err(&cldev->dev, "failed to send the SAP_ME_MSG_START message %d\n", ret); return ret; } return 0; } static int iwl_mei_enable(struct mei_cl_device *cldev) { int ret; ret = mei_cldev_enable(cldev); if (ret < 0) { dev_err(&cldev->dev, "failed to enable the device: %d\n", ret); return ret; } ret = mei_cldev_register_rx_cb(cldev, iwl_mei_rx); if (ret) { dev_err(&cldev->dev, "failed to register to the rx cb: %d\n", ret); mei_cldev_disable(cldev); return ret; } return 0; } struct iwl_mei_nvm *iwl_mei_get_nvm(void) { struct iwl_mei_nvm *nvm = NULL; struct iwl_mei *mei; int ret; mutex_lock(&iwl_mei_mutex); if (!iwl_mei_is_connected()) goto out; mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); if (!mei) goto out; ret = iwl_mei_send_sap_msg(iwl_mei_global_cldev, SAP_MSG_NOTIF_GET_NVM); if (ret) goto out; mutex_unlock(&iwl_mei_mutex); ret = wait_event_timeout(mei->get_nvm_wq, mei->nvm, 2 * HZ); if (!ret) return NULL; mutex_lock(&iwl_mei_mutex); if (!iwl_mei_is_connected()) goto out; mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); if (!mei) goto out; if (mei->nvm) nvm = kmemdup(mei->nvm, sizeof(*mei->nvm), GFP_KERNEL); out: mutex_unlock(&iwl_mei_mutex); return nvm; } EXPORT_SYMBOL_GPL(iwl_mei_get_nvm); #define IWL_MEI_PLDR_NUM_RETRIES 3 int iwl_mei_pldr_req(void) { struct iwl_mei *mei; int ret; struct iwl_sap_pldr_data msg = { .hdr.type = cpu_to_le16(SAP_MSG_NOTIF_PLDR), .hdr.len = cpu_to_le16(sizeof(msg) - sizeof(msg.hdr)), }; int i; mutex_lock(&iwl_mei_mutex); /* In case we didn't have a bind */ if (!iwl_mei_is_connected()) { ret = 0; goto out; } mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); if (!mei) { ret = -ENODEV; goto out; } if (!mei->amt_enabled) { ret = 0; goto out; } for (i = 0; i < IWL_MEI_PLDR_NUM_RETRIES; i++) { ret = iwl_mei_send_sap_msg_payload(mei->cldev, &msg.hdr); mutex_unlock(&iwl_mei_mutex); if (ret) return ret; ret = wait_event_timeout(mei->pldr_wq, mei->pldr_active, HZ / 2); if (ret) break; /* Take the mutex for the next iteration */ mutex_lock(&iwl_mei_mutex); } if (ret) return 0; ret = -ETIMEDOUT; out: mutex_unlock(&iwl_mei_mutex); return ret; } EXPORT_SYMBOL_GPL(iwl_mei_pldr_req); int iwl_mei_get_ownership(void) { struct iwl_mei *mei; int ret; mutex_lock(&iwl_mei_mutex); /* In case we didn't have a bind */ if (!iwl_mei_is_connected()) { ret = 0; goto out; } mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); if (!mei) { ret = -ENODEV; goto out; } if (!mei->amt_enabled) { ret = 0; goto out; } if (mei->got_ownership) { ret = 0; goto out; } ret = iwl_mei_send_sap_msg(mei->cldev, SAP_MSG_NOTIF_HOST_ASKS_FOR_NIC_OWNERSHIP); if (ret) goto out; mutex_unlock(&iwl_mei_mutex); ret = wait_event_timeout(mei->get_ownership_wq, mei->got_ownership, HZ / 2); if (!ret) { schedule_delayed_work(&mei->ownership_dwork, MEI_OWNERSHIP_RETAKE_TIMEOUT_MS); return -ETIMEDOUT; } return 0; out: mutex_unlock(&iwl_mei_mutex); return ret; } EXPORT_SYMBOL_GPL(iwl_mei_get_ownership); void iwl_mei_alive_notif(bool success) { struct iwl_mei *mei; struct iwl_sap_pldr_end_data msg = { .hdr.type = cpu_to_le16(SAP_MSG_NOTIF_PLDR_END), .hdr.len = cpu_to_le16(sizeof(msg) - sizeof(msg.hdr)), .status = success ? cpu_to_le32(SAP_PLDR_STATUS_SUCCESS) : cpu_to_le32(SAP_PLDR_STATUS_FAILURE), }; mutex_lock(&iwl_mei_mutex); if (!iwl_mei_is_connected()) goto out; mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); if (!mei || !mei->pldr_active) goto out; mei->pldr_active = false; iwl_mei_send_sap_msg_payload(mei->cldev, &msg.hdr); out: mutex_unlock(&iwl_mei_mutex); } EXPORT_SYMBOL_GPL(iwl_mei_alive_notif); void iwl_mei_host_associated(const struct iwl_mei_conn_info *conn_info, const struct iwl_mei_colloc_info *colloc_info) { struct iwl_sap_notif_host_link_up msg = { .hdr.type = cpu_to_le16(SAP_MSG_NOTIF_HOST_LINK_UP), .hdr.len = cpu_to_le16(sizeof(msg) - sizeof(msg.hdr)), .conn_info = { .ssid_len = cpu_to_le32(conn_info->ssid_len), .channel = conn_info->channel, .band = conn_info->band, .pairwise_cipher = cpu_to_le32(conn_info->pairwise_cipher), .auth_mode = cpu_to_le32(conn_info->auth_mode), }, }; struct iwl_mei *mei; if (conn_info->ssid_len > ARRAY_SIZE(msg.conn_info.ssid)) return; memcpy(msg.conn_info.ssid, conn_info->ssid, conn_info->ssid_len); memcpy(msg.conn_info.bssid, conn_info->bssid, ETH_ALEN); if (colloc_info) { msg.colloc_channel = colloc_info->channel; msg.colloc_band = colloc_info->channel <= 14 ? 0 : 1; memcpy(msg.colloc_bssid, colloc_info->bssid, ETH_ALEN); } mutex_lock(&iwl_mei_mutex); if (!iwl_mei_is_connected()) goto out; mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); if (!mei || !mei->amt_enabled) goto out; iwl_mei_send_sap_msg_payload(mei->cldev, &msg.hdr); out: kfree(iwl_mei_cache.conn_info); iwl_mei_cache.conn_info = kmemdup(&msg.conn_info, sizeof(msg.conn_info), GFP_KERNEL); mutex_unlock(&iwl_mei_mutex); } EXPORT_SYMBOL_GPL(iwl_mei_host_associated); void iwl_mei_host_disassociated(void) { struct iwl_mei *mei; struct iwl_sap_notif_host_link_down msg = { .hdr.type = cpu_to_le16(SAP_MSG_NOTIF_HOST_LINK_DOWN), .hdr.len = cpu_to_le16(sizeof(msg) - sizeof(msg.hdr)), .type = HOST_LINK_DOWN_TYPE_TEMPORARY, }; mutex_lock(&iwl_mei_mutex); if (!iwl_mei_is_connected()) goto out; mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); if (!mei || !mei->amt_enabled) goto out; iwl_mei_send_sap_msg_payload(mei->cldev, &msg.hdr); out: kfree(iwl_mei_cache.conn_info); iwl_mei_cache.conn_info = NULL; mutex_unlock(&iwl_mei_mutex); } EXPORT_SYMBOL_GPL(iwl_mei_host_disassociated); void iwl_mei_set_rfkill_state(bool hw_rfkill, bool sw_rfkill) { struct iwl_mei *mei; u32 rfkill_state = 0; struct iwl_sap_msg_dw msg = { .hdr.type = cpu_to_le16(SAP_MSG_NOTIF_RADIO_STATE), .hdr.len = cpu_to_le16(sizeof(msg) - sizeof(msg.hdr)), }; if (!sw_rfkill) rfkill_state |= SAP_SW_RFKILL_DEASSERTED; if (!hw_rfkill) rfkill_state |= SAP_HW_RFKILL_DEASSERTED; mutex_lock(&iwl_mei_mutex); if (!iwl_mei_is_connected()) goto out; msg.val = cpu_to_le32(rfkill_state); mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); if (!mei || !mei->amt_enabled) goto out; iwl_mei_send_sap_msg_payload(mei->cldev, &msg.hdr); out: iwl_mei_cache.rf_kill = rfkill_state; mutex_unlock(&iwl_mei_mutex); } EXPORT_SYMBOL_GPL(iwl_mei_set_rfkill_state); void iwl_mei_set_nic_info(const u8 *mac_address, const u8 *nvm_address) { struct iwl_mei *mei; struct iwl_sap_notif_host_nic_info msg = { .hdr.type = cpu_to_le16(SAP_MSG_NOTIF_NIC_INFO), .hdr.len = cpu_to_le16(sizeof(msg) - sizeof(msg.hdr)), }; mutex_lock(&iwl_mei_mutex); if (!iwl_mei_is_connected()) goto out; ether_addr_copy(msg.mac_address, mac_address); ether_addr_copy(msg.nvm_address, nvm_address); mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); if (!mei || !mei->amt_enabled) goto out; iwl_mei_send_sap_msg_payload(mei->cldev, &msg.hdr); out: ether_addr_copy(iwl_mei_cache.mac_address, mac_address); ether_addr_copy(iwl_mei_cache.nvm_address, nvm_address); mutex_unlock(&iwl_mei_mutex); } EXPORT_SYMBOL_GPL(iwl_mei_set_nic_info); void iwl_mei_set_country_code(u16 mcc) { struct iwl_mei *mei; struct iwl_sap_notif_country_code msg = { .hdr.type = cpu_to_le16(SAP_MSG_NOTIF_COUNTRY_CODE), .hdr.len = cpu_to_le16(sizeof(msg) - sizeof(msg.hdr)), .mcc = cpu_to_le16(mcc), }; mutex_lock(&iwl_mei_mutex); if (!iwl_mei_is_connected()) goto out; mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); if (!mei || !mei->amt_enabled) goto out; iwl_mei_send_sap_msg_payload(mei->cldev, &msg.hdr); out: iwl_mei_cache.mcc = mcc; mutex_unlock(&iwl_mei_mutex); } EXPORT_SYMBOL_GPL(iwl_mei_set_country_code); void iwl_mei_set_power_limit(const __le16 *power_limit) { struct iwl_mei *mei; struct iwl_sap_notif_sar_limits msg = { .hdr.type = cpu_to_le16(SAP_MSG_NOTIF_SAR_LIMITS), .hdr.len = cpu_to_le16(sizeof(msg) - sizeof(msg.hdr)), }; mutex_lock(&iwl_mei_mutex); if (!iwl_mei_is_connected()) goto out; mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); if (!mei || !mei->amt_enabled) goto out; memcpy(msg.sar_chain_info_table, power_limit, sizeof(msg.sar_chain_info_table)); iwl_mei_send_sap_msg_payload(mei->cldev, &msg.hdr); out: kfree(iwl_mei_cache.power_limit); iwl_mei_cache.power_limit = kmemdup(power_limit, sizeof(msg.sar_chain_info_table), GFP_KERNEL); mutex_unlock(&iwl_mei_mutex); } EXPORT_SYMBOL_GPL(iwl_mei_set_power_limit); void iwl_mei_set_netdev(struct net_device *netdev) { struct iwl_mei *mei; mutex_lock(&iwl_mei_mutex); if (!iwl_mei_is_connected()) { rcu_assign_pointer(iwl_mei_cache.netdev, netdev); goto out; } mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); if (!mei) goto out; if (!netdev) { struct net_device *dev = rcu_dereference_protected(iwl_mei_cache.netdev, lockdep_is_held(&iwl_mei_mutex)); if (!dev) goto out; netdev_rx_handler_unregister(dev); } rcu_assign_pointer(iwl_mei_cache.netdev, netdev); if (netdev && mei->amt_enabled) netdev_rx_handler_register(netdev, iwl_mei_rx_handler, mei); out: mutex_unlock(&iwl_mei_mutex); } EXPORT_SYMBOL_GPL(iwl_mei_set_netdev); void iwl_mei_device_state(bool up) { struct iwl_mei *mei; mutex_lock(&iwl_mei_mutex); if (!iwl_mei_is_connected()) goto out; mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); if (!mei) goto out; mei->device_down = !up; if (up || !mei->csme_taking_ownership) goto out; iwl_mei_send_sap_msg(mei->cldev, SAP_MSG_NOTIF_CSME_OWNERSHIP_CONFIRMED); mei->csme_taking_ownership = false; schedule_delayed_work(&mei->ownership_dwork, MEI_OWNERSHIP_RETAKE_TIMEOUT_MS); out: mutex_unlock(&iwl_mei_mutex); } EXPORT_SYMBOL_GPL(iwl_mei_device_state); int iwl_mei_register(void *priv, const struct iwl_mei_ops *ops) { int ret; /* * We must have a non-NULL priv pointer to not crash when there are * multiple WiFi devices. */ if (!priv) return -EINVAL; mutex_lock(&iwl_mei_mutex); /* do not allow registration if someone else already registered */ if (iwl_mei_cache.priv || iwl_mei_cache.ops) { ret = -EBUSY; goto out; } iwl_mei_cache.priv = priv; iwl_mei_cache.ops = ops; if (iwl_mei_global_cldev) { struct iwl_mei *mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); /* we have already a SAP connection */ if (iwl_mei_is_connected()) { if (mei->amt_enabled) iwl_mei_send_sap_msg(mei->cldev, SAP_MSG_NOTIF_WIFIDR_UP); ops->rfkill(priv, mei->link_prot_state, false); } } ret = 0; out: mutex_unlock(&iwl_mei_mutex); return ret; } EXPORT_SYMBOL_GPL(iwl_mei_register); void iwl_mei_start_unregister(void) { mutex_lock(&iwl_mei_mutex); /* At this point, the wifi driver should have removed the netdev */ if (rcu_access_pointer(iwl_mei_cache.netdev)) pr_err("Still had a netdev pointer set upon unregister\n"); kfree(iwl_mei_cache.conn_info); iwl_mei_cache.conn_info = NULL; kfree(iwl_mei_cache.power_limit); iwl_mei_cache.power_limit = NULL; iwl_mei_cache.ops = NULL; /* leave iwl_mei_cache.priv non-NULL to prevent any new registration */ mutex_unlock(&iwl_mei_mutex); } EXPORT_SYMBOL_GPL(iwl_mei_start_unregister); void iwl_mei_unregister_complete(void) { mutex_lock(&iwl_mei_mutex); iwl_mei_cache.priv = NULL; if (iwl_mei_global_cldev) { struct iwl_mei *mei = mei_cldev_get_drvdata(iwl_mei_global_cldev); if (mei->amt_enabled) iwl_mei_send_sap_msg(mei->cldev, SAP_MSG_NOTIF_WIFIDR_DOWN); mei->got_ownership = false; } mutex_unlock(&iwl_mei_mutex); } EXPORT_SYMBOL_GPL(iwl_mei_unregister_complete); #if IS_ENABLED(CONFIG_DEBUG_FS) static ssize_t iwl_mei_dbgfs_send_start_message_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { int ret; mutex_lock(&iwl_mei_mutex); if (!iwl_mei_global_cldev) { ret = -ENODEV; goto out; } ret = iwl_mei_send_start(iwl_mei_global_cldev); out: mutex_unlock(&iwl_mei_mutex); return ret ?: count; } static const struct file_operations iwl_mei_dbgfs_send_start_message_ops = { .write = iwl_mei_dbgfs_send_start_message_write, .open = simple_open, .llseek = default_llseek, }; static ssize_t iwl_mei_dbgfs_req_ownership_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { iwl_mei_get_ownership(); return count; } static const struct file_operations iwl_mei_dbgfs_req_ownership_ops = { .write = iwl_mei_dbgfs_req_ownership_write, .open = simple_open, .llseek = default_llseek, }; static void iwl_mei_dbgfs_register(struct iwl_mei *mei) { mei->dbgfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); if (!mei->dbgfs_dir) return; debugfs_create_ulong("status", S_IRUSR, mei->dbgfs_dir, &iwl_mei_status); debugfs_create_file("send_start_message", S_IWUSR, mei->dbgfs_dir, mei, &iwl_mei_dbgfs_send_start_message_ops); debugfs_create_file("req_ownership", S_IWUSR, mei->dbgfs_dir, mei, &iwl_mei_dbgfs_req_ownership_ops); } static void iwl_mei_dbgfs_unregister(struct iwl_mei *mei) { debugfs_remove_recursive(mei->dbgfs_dir); mei->dbgfs_dir = NULL; } #else static void iwl_mei_dbgfs_register(struct iwl_mei *mei) {} static void iwl_mei_dbgfs_unregister(struct iwl_mei *mei) {} #endif /* CONFIG_DEBUG_FS */ static void iwl_mei_ownership_dwork(struct work_struct *wk) { iwl_mei_get_ownership(); } #define ALLOC_SHARED_MEM_RETRY_MAX_NUM 3 /* * iwl_mei_probe - the probe function called by the mei bus enumeration * * This allocates the data needed by iwlmei and sets a pointer to this data * into the mei_cl_device's drvdata. * It starts the SAP protocol by sending the SAP_ME_MSG_START without * waiting for the answer. The answer will be caught later by the Rx callback. */ static int iwl_mei_probe(struct mei_cl_device *cldev, const struct mei_cl_device_id *id) { int alloc_retry = ALLOC_SHARED_MEM_RETRY_MAX_NUM; struct iwl_mei *mei; int ret; mei = devm_kzalloc(&cldev->dev, sizeof(*mei), GFP_KERNEL); if (!mei) return -ENOMEM; init_waitqueue_head(&mei->get_nvm_wq); INIT_WORK(&mei->send_csa_msg_wk, iwl_mei_send_csa_msg_wk); INIT_DELAYED_WORK(&mei->csa_throttle_end_wk, iwl_mei_csa_throttle_end_wk); init_waitqueue_head(&mei->get_ownership_wq); init_waitqueue_head(&mei->pldr_wq); spin_lock_init(&mei->data_q_lock); INIT_WORK(&mei->netdev_work, iwl_mei_netdev_work); INIT_DELAYED_WORK(&mei->ownership_dwork, iwl_mei_ownership_dwork); mei_cldev_set_drvdata(cldev, mei); mei->cldev = cldev; mei->device_down = true; do { ret = iwl_mei_alloc_shared_mem(cldev); if (!ret) break; /* * The CSME firmware needs to boot the internal WLAN client. * This can take time in certain configurations (usually * upon resume and when the whole CSME firmware is shut down * during suspend). * * Wait a bit before retrying and hope we'll succeed next time. */ dev_dbg(&cldev->dev, "Couldn't allocate the shared memory: %d, attempt %d / %d\n", ret, alloc_retry, ALLOC_SHARED_MEM_RETRY_MAX_NUM); msleep(100); alloc_retry--; } while (alloc_retry); if (ret) { dev_err(&cldev->dev, "Couldn't allocate the shared memory: %d\n", ret); goto free; } iwl_mei_init_shared_mem(mei); ret = iwl_mei_enable(cldev); if (ret) goto free_shared_mem; iwl_mei_dbgfs_register(mei); /* * We now have a Rx function in place, start the SAP protocol * we expect to get the SAP_ME_MSG_START_OK response later on. */ mutex_lock(&iwl_mei_mutex); ret = iwl_mei_send_start(cldev); mutex_unlock(&iwl_mei_mutex); if (ret) goto debugfs_unregister; /* must be last */ iwl_mei_global_cldev = cldev; return 0; debugfs_unregister: iwl_mei_dbgfs_unregister(mei); mei_cldev_disable(cldev); free_shared_mem: iwl_mei_free_shared_mem(cldev); free: mei_cldev_set_drvdata(cldev, NULL); devm_kfree(&cldev->dev, mei); return ret; } #define SEND_SAP_MAX_WAIT_ITERATION 10 #define IWLMEI_DEVICE_DOWN_WAIT_ITERATION 50 static void iwl_mei_remove(struct mei_cl_device *cldev) { struct iwl_mei *mei = mei_cldev_get_drvdata(cldev); int i; /* * We are being removed while the bus is active, it means we are * going to suspend/ shutdown, so the NIC will disappear. */ if (mei_cldev_enabled(cldev) && iwl_mei_cache.ops) { unsigned int iter = IWLMEI_DEVICE_DOWN_WAIT_ITERATION; bool down = false; /* * In case of suspend, wait for the mac to stop and don't remove * the interface. This will allow the interface to come back * on resume. */ while (!down && iter--) { mdelay(1); mutex_lock(&iwl_mei_mutex); down = mei->device_down; mutex_unlock(&iwl_mei_mutex); } if (!down) iwl_mei_cache.ops->nic_stolen(iwl_mei_cache.priv); } if (rcu_access_pointer(iwl_mei_cache.netdev)) { struct net_device *dev; /* * First take rtnl and only then the mutex to avoid an ABBA * with iwl_mei_set_netdev() */ rtnl_lock(); mutex_lock(&iwl_mei_mutex); /* * If we are suspending and the wifi driver hasn't removed it's netdev * yet, do it now. In any case, don't change the cache.netdev pointer. */ dev = rcu_dereference_protected(iwl_mei_cache.netdev, lockdep_is_held(&iwl_mei_mutex)); netdev_rx_handler_unregister(dev); mutex_unlock(&iwl_mei_mutex); rtnl_unlock(); } mutex_lock(&iwl_mei_mutex); /* Tell CSME that we are going down so that it won't access the * memory anymore, make sure this message goes through immediately. */ mei->csa_throttled = false; iwl_mei_send_sap_msg(mei->cldev, SAP_MSG_NOTIF_HOST_GOES_DOWN); for (i = 0; i < SEND_SAP_MAX_WAIT_ITERATION; i++) { if (!iwl_mei_host_to_me_data_pending(mei)) break; msleep(20); } /* If we couldn't make sure that CSME saw the HOST_GOES_DOWN * message, it means that it will probably keep reading memory * that we are going to unmap and free, expect IOMMU error * messages. */ if (i == SEND_SAP_MAX_WAIT_ITERATION) dev_err(&mei->cldev->dev, "Couldn't get ACK from CSME on HOST_GOES_DOWN message\n"); mutex_unlock(&iwl_mei_mutex); /* * This looks strange, but this lock is taken here to make sure that * iwl_mei_add_data_to_ring called from the Tx path sees that we * clear the IWL_MEI_STATUS_SAP_CONNECTED bit. * Rx isn't a problem because the rx_handler can't be called after * having been unregistered. */ spin_lock_bh(&mei->data_q_lock); clear_bit(IWL_MEI_STATUS_SAP_CONNECTED, &iwl_mei_status); spin_unlock_bh(&mei->data_q_lock); if (iwl_mei_cache.ops) iwl_mei_cache.ops->rfkill(iwl_mei_cache.priv, false, false); /* * mei_cldev_disable will return only after all the MEI Rx is done. * It must be called when iwl_mei_mutex is *not* held, since it waits * for our Rx handler to complete. * After it returns, no new Rx will start. */ mei_cldev_disable(cldev); /* * Since the netdev was already removed and the netdev's removal * includes a call to synchronize_net() so that we know there won't be * any new Rx that will trigger the following workers. */ cancel_work_sync(&mei->send_csa_msg_wk); cancel_delayed_work_sync(&mei->csa_throttle_end_wk); cancel_work_sync(&mei->netdev_work); cancel_delayed_work_sync(&mei->ownership_dwork); /* * If someone waits for the ownership, let him know that we are going * down and that we are not connected anymore. He'll be able to take * the device. */ wake_up_all(&mei->get_ownership_wq); wake_up_all(&mei->pldr_wq); mutex_lock(&iwl_mei_mutex); iwl_mei_global_cldev = NULL; wake_up_all(&mei->get_nvm_wq); iwl_mei_free_shared_mem(cldev); iwl_mei_dbgfs_unregister(mei); mei_cldev_set_drvdata(cldev, NULL); kfree(mei->nvm); kfree(rcu_access_pointer(mei->filters)); devm_kfree(&cldev->dev, mei); mutex_unlock(&iwl_mei_mutex); } static const struct mei_cl_device_id iwl_mei_tbl[] = { { .name = KBUILD_MODNAME, .uuid = MEI_WLAN_UUID, .version = MEI_CL_VERSION_ANY, }, /* required last entry */ { } }; /* * Do not export the device table because this module is loaded by * iwlwifi's dependency. */ static struct mei_cl_driver iwl_mei_cl_driver = { .id_table = iwl_mei_tbl, .name = KBUILD_MODNAME, .probe = iwl_mei_probe, .remove = iwl_mei_remove, }; module_mei_cl_driver(iwl_mei_cl_driver);
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