From: Amitkumar Karwar Date: Tue, 26 Jul 2016 14:01:44 +0000 (+0530) Subject: mwifiex: add PCIe function level reset support X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4c5dae59d2e9386c706a2f3c7c2746ae277bf568;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git mwifiex: add PCIe function level reset support This patch implements pre and post FLR handlers to support PCIe FLR functionality. Software cleanup is performed in pre-FLR whereas firmware is downloaded and software is re-initialised in post-FLR handler. Following command triggers FLR. echo "1" > /sys/bus/pci/devices/$NUMBER/reset This feature can be used as a recovery mechanism when firmware gets hang. Signed-off-by: Amitkumar Karwar Signed-off-by: Kalle Valo --- diff --git a/drivers/net/wireless/marvell/mwifiex/main.c b/drivers/net/wireless/marvell/mwifiex/main.c index 029e5da1e6fd..9b2e98cfe090 100644 --- a/drivers/net/wireless/marvell/mwifiex/main.c +++ b/drivers/net/wireless/marvell/mwifiex/main.c @@ -493,9 +493,11 @@ static void mwifiex_free_adapter(struct mwifiex_adapter *adapter) */ static void mwifiex_terminate_workqueue(struct mwifiex_adapter *adapter) { - flush_workqueue(adapter->workqueue); - destroy_workqueue(adapter->workqueue); - adapter->workqueue = NULL; + if (adapter->workqueue) { + flush_workqueue(adapter->workqueue); + destroy_workqueue(adapter->workqueue); + adapter->workqueue = NULL; + } if (adapter->rx_workqueue) { flush_workqueue(adapter->rx_workqueue); @@ -574,10 +576,13 @@ static void mwifiex_fw_dpc(const struct firmware *firmware, void *context) } priv = adapter->priv[MWIFIEX_BSS_ROLE_STA]; - if (mwifiex_register_cfg80211(adapter)) { - mwifiex_dbg(adapter, ERROR, - "cannot register with cfg80211\n"); - goto err_init_fw; + + if (!adapter->wiphy) { + if (mwifiex_register_cfg80211(adapter)) { + mwifiex_dbg(adapter, ERROR, + "cannot register with cfg80211\n"); + goto err_init_fw; + } } if (mwifiex_init_channel_scan_gap(adapter)) { @@ -671,7 +676,8 @@ done: /* * This function initializes the hardware and gets firmware. */ -static int mwifiex_init_hw_fw(struct mwifiex_adapter *adapter) +static int mwifiex_init_hw_fw(struct mwifiex_adapter *adapter, + bool req_fw_nowait) { int ret; @@ -686,12 +692,25 @@ static int mwifiex_init_hw_fw(struct mwifiex_adapter *adapter) return -1; } } - ret = request_firmware_nowait(THIS_MODULE, 1, adapter->fw_name, - adapter->dev, GFP_KERNEL, adapter, - mwifiex_fw_dpc); - if (ret < 0) - mwifiex_dbg(adapter, ERROR, - "request_firmware_nowait error %d\n", ret); + + if (req_fw_nowait) { + ret = request_firmware_nowait(THIS_MODULE, 1, adapter->fw_name, + adapter->dev, GFP_KERNEL, adapter, + mwifiex_fw_dpc); + if (ret < 0) + mwifiex_dbg(adapter, ERROR, + "request_firmware_nowait error %d\n", ret); + } else { + ret = request_firmware(&adapter->firmware, + adapter->fw_name, + adapter->dev); + if (ret < 0) + mwifiex_dbg(adapter, ERROR, + "request_firmware error %d\n", ret); + else + mwifiex_fw_dpc(adapter->firmware, (void *)adapter); + } + return ret; } @@ -1340,6 +1359,199 @@ static void mwifiex_main_work_queue(struct work_struct *work) mwifiex_main_process(adapter); } +/* + * This function gets called during PCIe function level reset. Required + * code is extracted from mwifiex_remove_card() + */ +static int +mwifiex_shutdown_sw(struct mwifiex_adapter *adapter, struct semaphore *sem) +{ + struct mwifiex_private *priv; + int i; + + if (down_interruptible(sem)) + goto exit_sem_err; + + if (!adapter) + goto exit_remove; + + priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY); + mwifiex_deauthenticate(priv, NULL); + + /* We can no longer handle interrupts once we start doing the teardown + * below. + */ + if (adapter->if_ops.disable_int) + adapter->if_ops.disable_int(adapter); + + adapter->surprise_removed = true; + mwifiex_terminate_workqueue(adapter); + + /* Stop data */ + for (i = 0; i < adapter->priv_num; i++) { + priv = adapter->priv[i]; + if (priv && priv->netdev) { + mwifiex_stop_net_dev_queue(priv->netdev, adapter); + if (netif_carrier_ok(priv->netdev)) + netif_carrier_off(priv->netdev); + netif_device_detach(priv->netdev); + } + } + + mwifiex_dbg(adapter, CMD, "cmd: calling mwifiex_shutdown_drv...\n"); + adapter->init_wait_q_woken = false; + + if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS) + wait_event_interruptible(adapter->init_wait_q, + adapter->init_wait_q_woken); + if (adapter->if_ops.down_dev) + adapter->if_ops.down_dev(adapter); + + mwifiex_dbg(adapter, CMD, "cmd: mwifiex_shutdown_drv done\n"); + if (atomic_read(&adapter->rx_pending) || + atomic_read(&adapter->tx_pending) || + atomic_read(&adapter->cmd_pending)) { + mwifiex_dbg(adapter, ERROR, + "rx_pending=%d, tx_pending=%d,\t" + "cmd_pending=%d\n", + atomic_read(&adapter->rx_pending), + atomic_read(&adapter->tx_pending), + atomic_read(&adapter->cmd_pending)); + } + + for (i = 0; i < adapter->priv_num; i++) { + priv = adapter->priv[i]; + if (!priv) + continue; + rtnl_lock(); + if (priv->netdev && + priv->wdev.iftype != NL80211_IFTYPE_UNSPECIFIED) + mwifiex_del_virtual_intf(adapter->wiphy, &priv->wdev); + rtnl_unlock(); + } + +exit_remove: + up(sem); +exit_sem_err: + mwifiex_dbg(adapter, INFO, "%s, successful\n", __func__); + return 0; +} + +/* This function gets called during PCIe function level reset. Required + * code is extracted from mwifiex_add_card() + */ +static int +mwifiex_reinit_sw(struct mwifiex_adapter *adapter, struct semaphore *sem, + struct mwifiex_if_ops *if_ops, u8 iface_type) +{ + char fw_name[32]; + struct pcie_service_card *card = adapter->card; + + if (down_interruptible(sem)) + goto exit_sem_err; + + mwifiex_init_lock_list(adapter); + if (adapter->if_ops.up_dev) + adapter->if_ops.up_dev(adapter); + + adapter->iface_type = iface_type; + adapter->card_sem = sem; + + adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING; + adapter->surprise_removed = false; + init_waitqueue_head(&adapter->init_wait_q); + adapter->is_suspended = false; + adapter->hs_activated = false; + init_waitqueue_head(&adapter->hs_activate_wait_q); + init_waitqueue_head(&adapter->cmd_wait_q.wait); + adapter->cmd_wait_q.status = 0; + adapter->scan_wait_q_woken = false; + + if ((num_possible_cpus() > 1) || adapter->iface_type == MWIFIEX_USB) + adapter->rx_work_enabled = true; + + adapter->workqueue = + alloc_workqueue("MWIFIEX_WORK_QUEUE", + WQ_HIGHPRI | WQ_MEM_RECLAIM | WQ_UNBOUND, 1); + if (!adapter->workqueue) + goto err_kmalloc; + + INIT_WORK(&adapter->main_work, mwifiex_main_work_queue); + + if (adapter->rx_work_enabled) { + adapter->rx_workqueue = alloc_workqueue("MWIFIEX_RX_WORK_QUEUE", + WQ_HIGHPRI | + WQ_MEM_RECLAIM | + WQ_UNBOUND, 1); + if (!adapter->rx_workqueue) + goto err_kmalloc; + INIT_WORK(&adapter->rx_work, mwifiex_rx_work_queue); + } + + /* Register the device. Fill up the private data structure with + * relevant information from the card. Some code extracted from + * mwifiex_register_dev() + */ + mwifiex_dbg(adapter, INFO, "%s, mwifiex_init_hw_fw()...\n", __func__); + strcpy(fw_name, adapter->fw_name); + strcpy(adapter->fw_name, PCIE8997_DEFAULT_WIFIFW_NAME); + + adapter->tx_buf_size = card->pcie.tx_buf_size; + adapter->ext_scan = card->pcie.can_ext_scan; + if (mwifiex_init_hw_fw(adapter, false)) { + strcpy(adapter->fw_name, fw_name); + mwifiex_dbg(adapter, ERROR, + "%s: firmware init failed\n", __func__); + goto err_init_fw; + } + strcpy(adapter->fw_name, fw_name); + mwifiex_dbg(adapter, INFO, "%s, successful\n", __func__); + up(sem); + return 0; + +err_init_fw: + mwifiex_dbg(adapter, ERROR, "info: %s: unregister device\n", __func__); + if (adapter->if_ops.unregister_dev) + adapter->if_ops.unregister_dev(adapter); + if (adapter->hw_status == MWIFIEX_HW_STATUS_READY) { + mwifiex_dbg(adapter, ERROR, + "info: %s: shutdown mwifiex\n", __func__); + adapter->init_wait_q_woken = false; + + if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS) + wait_event_interruptible(adapter->init_wait_q, + adapter->init_wait_q_woken); + } + +err_kmalloc: + mwifiex_terminate_workqueue(adapter); + adapter->surprise_removed = true; + up(sem); +exit_sem_err: + mwifiex_dbg(adapter, INFO, "%s, error\n", __func__); + + return -1; +} + +/* This function processes pre and post PCIe function level resets. + * It performs software cleanup without touching PCIe specific code. + * Also, during initialization PCIe stuff is skipped. + */ +void mwifiex_do_flr(struct mwifiex_adapter *adapter, bool prepare) +{ + struct mwifiex_if_ops if_ops; + + if (!prepare) { + mwifiex_reinit_sw(adapter, adapter->card_sem, &if_ops, + adapter->iface_type); + } else { + memcpy(&if_ops, &adapter->if_ops, + sizeof(struct mwifiex_if_ops)); + mwifiex_shutdown_sw(adapter, adapter->card_sem); + } +} +EXPORT_SYMBOL_GPL(mwifiex_do_flr); + /* * This function adds the card. * @@ -1411,7 +1623,7 @@ mwifiex_add_card(void *card, struct semaphore *sem, goto err_registerdev; } - if (mwifiex_init_hw_fw(adapter)) { + if (mwifiex_init_hw_fw(adapter, true)) { pr_err("%s: firmware init failed\n", __func__); goto err_init_fw; } diff --git a/drivers/net/wireless/marvell/mwifiex/main.h b/drivers/net/wireless/marvell/mwifiex/main.h index 17221c4f681f..26df28f4bfb2 100644 --- a/drivers/net/wireless/marvell/mwifiex/main.h +++ b/drivers/net/wireless/marvell/mwifiex/main.h @@ -829,6 +829,8 @@ struct mwifiex_if_ops { void (*deaggr_pkt)(struct mwifiex_adapter *, struct sk_buff *); void (*multi_port_resync)(struct mwifiex_adapter *); bool (*is_port_ready)(struct mwifiex_private *); + void (*down_dev)(struct mwifiex_adapter *); + void (*up_dev)(struct mwifiex_adapter *); }; struct mwifiex_adapter { @@ -1629,4 +1631,5 @@ void mwifiex_debugfs_remove(void); void mwifiex_dev_debugfs_init(struct mwifiex_private *priv); void mwifiex_dev_debugfs_remove(struct mwifiex_private *priv); #endif +void mwifiex_do_flr(struct mwifiex_adapter *adapter, bool prepare); #endif /* !_MWIFIEX_MAIN_H_ */ diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c index c1b3e8ef34ec..e4ef90e222d9 100644 --- a/drivers/net/wireless/marvell/mwifiex/pcie.c +++ b/drivers/net/wireless/marvell/mwifiex/pcie.c @@ -277,6 +277,52 @@ static const struct pci_device_id mwifiex_ids[] = { MODULE_DEVICE_TABLE(pci, mwifiex_ids); +static void mwifiex_pcie_reset_notify(struct pci_dev *pdev, bool prepare) +{ + struct mwifiex_adapter *adapter; + struct pcie_service_card *card; + + if (!pdev) { + pr_err("%s: PCIe device is not specified\n", __func__); + return; + } + + card = (struct pcie_service_card *)pci_get_drvdata(pdev); + if (!card || !card->adapter) { + pr_err("%s: Card or adapter structure is not valid (%ld)\n", + __func__, (long)card); + return; + } + + adapter = card->adapter; + mwifiex_dbg(adapter, INFO, + "%s: vendor=0x%4.04x device=0x%4.04x rev=%d %s\n", + __func__, pdev->vendor, pdev->device, + pdev->revision, + prepare ? "Pre-FLR" : "Post-FLR"); + + if (prepare) { + /* Kernel would be performing FLR after this notification. + * Cleanup all software without cleaning anything related to + * PCIe and HW. + */ + mwifiex_do_flr(adapter, prepare); + adapter->surprise_removed = true; + } else { + /* Kernel stores and restores PCIe function context before and + * after performing FLR respectively. Reconfigure the software + * and firmware including firmware redownload + */ + adapter->surprise_removed = false; + mwifiex_do_flr(adapter, prepare); + } + mwifiex_dbg(adapter, INFO, "%s, successful\n", __func__); +} + +static const struct pci_error_handlers mwifiex_pcie_err_handler[] = { + { .reset_notify = mwifiex_pcie_reset_notify, }, +}; + #ifdef CONFIG_PM_SLEEP /* Power Management Hooks */ static SIMPLE_DEV_PM_OPS(mwifiex_pcie_pm_ops, mwifiex_pcie_suspend, @@ -295,6 +341,7 @@ static struct pci_driver __refdata mwifiex_pcie = { }, #endif .shutdown = mwifiex_pcie_shutdown, + .err_handler = mwifiex_pcie_err_handler, }; /* @@ -2953,7 +3000,6 @@ static int mwifiex_register_dev(struct mwifiex_adapter *adapter) static void mwifiex_unregister_dev(struct mwifiex_adapter *adapter) { struct pcie_service_card *card = adapter->card; - const struct mwifiex_pcie_card_reg *reg; struct pci_dev *pdev; int i; @@ -2977,8 +3023,90 @@ static void mwifiex_unregister_dev(struct mwifiex_adapter *adapter) if (card->msi_enable) pci_disable_msi(pdev); } + } +} - reg = card->pcie.reg; +/* This function initializes the PCI-E host memory space, WCB rings, etc. + * + * The following initializations steps are followed - + * - Allocate TXBD ring buffers + * - Allocate RXBD ring buffers + * - Allocate event BD ring buffers + * - Allocate command response ring buffer + * - Allocate sleep cookie buffer + * Part of mwifiex_pcie_init(), not reset the PCIE registers + */ +static void mwifiex_pcie_up_dev(struct mwifiex_adapter *adapter) +{ + struct pcie_service_card *card = adapter->card; + int ret; + struct pci_dev *pdev = card->dev; + const struct mwifiex_pcie_card_reg *reg = card->pcie.reg; + + card->cmdrsp_buf = NULL; + ret = mwifiex_pcie_create_txbd_ring(adapter); + if (ret) { + mwifiex_dbg(adapter, ERROR, "Failed to create txbd ring\n"); + goto err_cre_txbd; + } + + ret = mwifiex_pcie_create_rxbd_ring(adapter); + if (ret) { + mwifiex_dbg(adapter, ERROR, "Failed to create rxbd ring\n"); + goto err_cre_rxbd; + } + + ret = mwifiex_pcie_create_evtbd_ring(adapter); + if (ret) { + mwifiex_dbg(adapter, ERROR, "Failed to create evtbd ring\n"); + goto err_cre_evtbd; + } + + ret = mwifiex_pcie_alloc_cmdrsp_buf(adapter); + if (ret) { + mwifiex_dbg(adapter, ERROR, "Failed to allocate cmdbuf buffer\n"); + goto err_alloc_cmdbuf; + } + + if (reg->sleep_cookie) { + ret = mwifiex_pcie_alloc_sleep_cookie_buf(adapter); + if (ret) { + mwifiex_dbg(adapter, ERROR, "Failed to allocate sleep_cookie buffer\n"); + goto err_alloc_cookie; + } + } else { + card->sleep_cookie_vbase = NULL; + } + return; + +err_alloc_cookie: + mwifiex_pcie_delete_cmdrsp_buf(adapter); +err_alloc_cmdbuf: + mwifiex_pcie_delete_evtbd_ring(adapter); +err_cre_evtbd: + mwifiex_pcie_delete_rxbd_ring(adapter); +err_cre_rxbd: + mwifiex_pcie_delete_txbd_ring(adapter); +err_cre_txbd: + pci_iounmap(pdev, card->pci_mmap1); +} + +/* This function cleans up the PCI-E host memory space. + * Some code is extracted from mwifiex_unregister_dev() + * + */ +static void mwifiex_pcie_down_dev(struct mwifiex_adapter *adapter) +{ + struct pcie_service_card *card = adapter->card; + const struct mwifiex_pcie_card_reg *reg = card->pcie.reg; + + if (mwifiex_write_reg(adapter, reg->drv_rdy, 0x00000000)) + mwifiex_dbg(adapter, ERROR, "Failed to write driver not-ready signature\n"); + + adapter->seq_num = 0; + adapter->tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_4K; + + if (card) { if (reg->sleep_cookie) mwifiex_pcie_delete_sleep_cookie_buf(adapter); @@ -2988,6 +3116,8 @@ static void mwifiex_unregister_dev(struct mwifiex_adapter *adapter) mwifiex_pcie_delete_txbd_ring(adapter); card->cmdrsp_buf = NULL; } + + return; } static struct mwifiex_if_ops pcie_ops = { @@ -3014,6 +3144,8 @@ static struct mwifiex_if_ops pcie_ops = { .clean_pcie_ring = mwifiex_clean_pcie_ring_buf, .reg_dump = mwifiex_pcie_reg_dump, .device_dump = mwifiex_pcie_device_dump, + .down_dev = mwifiex_pcie_down_dev, + .up_dev = mwifiex_pcie_up_dev, }; /* diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.h b/drivers/net/wireless/marvell/mwifiex/pcie.h index f05061cea5cd..f6992f0dbf17 100644 --- a/drivers/net/wireless/marvell/mwifiex/pcie.h +++ b/drivers/net/wireless/marvell/mwifiex/pcie.h @@ -37,6 +37,7 @@ #define PCIEUART8997_FW_NAME_V2 "mrvl/pcieuart8997_combo_v2.bin" #define PCIEUSB8997_FW_NAME_Z "mrvl/pcieusb8997_combo.bin" #define PCIEUSB8997_FW_NAME_V2 "mrvl/pcieusb8997_combo_v2.bin" +#define PCIE8997_DEFAULT_WIFIFW_NAME "mrvl/pcie8997_wlan.bin" #define PCIE_VENDOR_ID_MARVELL (0x11ab) #define PCIE_VENDOR_ID_V2_MARVELL (0x1b4b)