diff options
Diffstat (limited to 'drivers/net/wwan')
21 files changed, 1357 insertions, 112 deletions
diff --git a/drivers/net/wwan/Kconfig b/drivers/net/wwan/Kconfig index 17543be14665..609fd4a2c865 100644 --- a/drivers/net/wwan/Kconfig +++ b/drivers/net/wwan/Kconfig @@ -16,6 +16,17 @@ config WWAN if WWAN +config WWAN_DEBUGFS + bool "WWAN devices debugfs interface" if EXPERT + depends on DEBUG_FS + default y + help + Enables debugfs infrastructure for the WWAN core and device drivers. + + If this option is selected, then you can find the debug interface + elements for each WWAN device in a directory that is corresponding to + the device name: debugfs/wwan/wwanX. + config WWAN_HWSIM tristate "Simulated WWAN device" help @@ -50,6 +61,19 @@ config MHI_WWAN_MBIM To compile this driver as a module, choose M here: the module will be called mhi_wwan_mbim. +config QCOM_BAM_DMUX + tristate "Qualcomm BAM-DMUX WWAN network driver" + depends on (DMA_ENGINE && PM && QCOM_SMEM_STATE) || COMPILE_TEST + help + The BAM Data Multiplexer provides access to the network data channels + of modems integrated into many older Qualcomm SoCs, e.g. Qualcomm + MSM8916 or MSM8974. The connection can be established via QMI/AT from + userspace with control ports available through the WWAN subsystem + (CONFIG_RPMSG_WWAN_CTRL) or QRTR network sockets (CONFIG_QRTR). + + To compile this driver as a module, choose M here: the module will be + called qcom_bam_dmux. + config RPMSG_WWAN_CTRL tristate "RPMSG WWAN control driver" depends on RPMSG @@ -72,6 +96,7 @@ config IOSM tristate "IOSM Driver for Intel M.2 WWAN Device" depends on INTEL_IOMMU select NET_DEVLINK + select RELAY if WWAN_DEBUGFS help This driver enables Intel M.2 WWAN Device communication. diff --git a/drivers/net/wwan/Makefile b/drivers/net/wwan/Makefile index fe51feedac21..e722650bebea 100644 --- a/drivers/net/wwan/Makefile +++ b/drivers/net/wwan/Makefile @@ -10,5 +10,6 @@ obj-$(CONFIG_WWAN_HWSIM) += wwan_hwsim.o obj-$(CONFIG_MHI_WWAN_CTRL) += mhi_wwan_ctrl.o obj-$(CONFIG_MHI_WWAN_MBIM) += mhi_wwan_mbim.o +obj-$(CONFIG_QCOM_BAM_DMUX) += qcom_bam_dmux.o obj-$(CONFIG_RPMSG_WWAN_CTRL) += rpmsg_wwan_ctrl.o obj-$(CONFIG_IOSM) += iosm/ diff --git a/drivers/net/wwan/iosm/Makefile b/drivers/net/wwan/iosm/Makefile index b838034bb120..fa8d6afd18e1 100644 --- a/drivers/net/wwan/iosm/Makefile +++ b/drivers/net/wwan/iosm/Makefile @@ -23,4 +23,8 @@ iosm-y = \ iosm_ipc_flash.o \ iosm_ipc_coredump.o +iosm-$(CONFIG_WWAN_DEBUGFS) += \ + iosm_ipc_debugfs.o \ + iosm_ipc_trace.o + obj-$(CONFIG_IOSM) := iosm.o diff --git a/drivers/net/wwan/iosm/iosm_ipc_debugfs.c b/drivers/net/wwan/iosm/iosm_ipc_debugfs.c new file mode 100644 index 000000000000..f2f57751a7d2 --- /dev/null +++ b/drivers/net/wwan/iosm/iosm_ipc_debugfs.c @@ -0,0 +1,29 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2020-2021 Intel Corporation. + */ + +#include <linux/debugfs.h> +#include <linux/wwan.h> + +#include "iosm_ipc_imem.h" +#include "iosm_ipc_trace.h" +#include "iosm_ipc_debugfs.h" + +void ipc_debugfs_init(struct iosm_imem *ipc_imem) +{ + struct dentry *debugfs_pdev = wwan_get_debugfs_dir(ipc_imem->dev); + + ipc_imem->debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, + debugfs_pdev); + + ipc_imem->trace = ipc_trace_init(ipc_imem); + if (!ipc_imem->trace) + dev_warn(ipc_imem->dev, "trace channel init failed"); +} + +void ipc_debugfs_deinit(struct iosm_imem *ipc_imem) +{ + ipc_trace_deinit(ipc_imem->trace); + debugfs_remove_recursive(ipc_imem->debugfs_dir); +} diff --git a/drivers/net/wwan/iosm/iosm_ipc_debugfs.h b/drivers/net/wwan/iosm/iosm_ipc_debugfs.h new file mode 100644 index 000000000000..8a84bfa2c14a --- /dev/null +++ b/drivers/net/wwan/iosm/iosm_ipc_debugfs.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0-only + * + * Copyright (C) 2020-2021 Intel Corporation. + */ + +#ifndef IOSM_IPC_DEBUGFS_H +#define IOSM_IPC_DEBUGFS_H + +#ifdef CONFIG_WWAN_DEBUGFS +void ipc_debugfs_init(struct iosm_imem *ipc_imem); +void ipc_debugfs_deinit(struct iosm_imem *ipc_imem); +#else +static inline void ipc_debugfs_init(struct iosm_imem *ipc_imem) {} +static inline void ipc_debugfs_deinit(struct iosm_imem *ipc_imem) {} +#endif + +#endif diff --git a/drivers/net/wwan/iosm/iosm_ipc_imem.c b/drivers/net/wwan/iosm/iosm_ipc_imem.c index cff3b43ca4d7..f9e8e0ee4de3 100644 --- a/drivers/net/wwan/iosm/iosm_ipc_imem.c +++ b/drivers/net/wwan/iosm/iosm_ipc_imem.c @@ -10,6 +10,8 @@ #include "iosm_ipc_flash.h" #include "iosm_ipc_imem.h" #include "iosm_ipc_port.h" +#include "iosm_ipc_trace.h" +#include "iosm_ipc_debugfs.h" /* Check the wwan ips if it is valid with Channel as input. */ static int ipc_imem_check_wwan_ips(struct ipc_mem_channel *chnl) @@ -132,7 +134,6 @@ static int ipc_imem_setup_cp_mux_cap_init(struct iosm_imem *ipc_imem, * for channel alloc function. */ cfg->instance_id = IPC_MEM_MUX_IP_CH_IF_ID; - cfg->nr_sessions = IPC_MEM_MUX_IP_SESSION_ENTRIES; return 0; } @@ -181,9 +182,9 @@ void ipc_imem_hrtimer_stop(struct hrtimer *hr_timer) bool ipc_imem_ul_write_td(struct iosm_imem *ipc_imem) { struct ipc_mem_channel *channel; + bool hpda_ctrl_pending = false; struct sk_buff_head *ul_list; bool hpda_pending = false; - bool forced_hpdu = false; struct ipc_pipe *pipe; int i; @@ -200,15 +201,19 @@ bool ipc_imem_ul_write_td(struct iosm_imem *ipc_imem) ul_list = &channel->ul_list; /* Fill the transfer descriptor with the uplink buffer info. */ - hpda_pending |= ipc_protocol_ul_td_send(ipc_imem->ipc_protocol, + if (!ipc_imem_check_wwan_ips(channel)) { + hpda_ctrl_pending |= + ipc_protocol_ul_td_send(ipc_imem->ipc_protocol, pipe, ul_list); - - /* forced HP update needed for non data channels */ - if (hpda_pending && !ipc_imem_check_wwan_ips(channel)) - forced_hpdu = true; + } else { + hpda_pending |= + ipc_protocol_ul_td_send(ipc_imem->ipc_protocol, + pipe, ul_list); + } } - if (forced_hpdu) { + /* forced HP update needed for non data channels */ + if (hpda_ctrl_pending) { hpda_pending = false; ipc_protocol_doorbell_trigger(ipc_imem->ipc_protocol, IPC_HP_UL_WRITE_TD); @@ -265,9 +270,14 @@ static void ipc_imem_dl_skb_process(struct iosm_imem *ipc_imem, switch (pipe->channel->ctype) { case IPC_CTYPE_CTRL: port_id = pipe->channel->channel_id; + ipc_pcie_addr_unmap(ipc_imem->pcie, IPC_CB(skb)->len, + IPC_CB(skb)->mapping, + IPC_CB(skb)->direction); if (port_id == IPC_MEM_CTRL_CHL_ID_7) ipc_imem_sys_devlink_notify_rx(ipc_imem->ipc_devlink, skb); + else if (ipc_is_trace_channel(ipc_imem, port_id)) + ipc_trace_port_rx(ipc_imem, skb); else wwan_port_rx(ipc_imem->ipc_port[port_id]->iosm_port, skb); @@ -527,6 +537,9 @@ static void ipc_imem_run_state_worker(struct work_struct *instance) return; } + if (test_and_clear_bit(IOSM_DEVLINK_INIT, &ipc_imem->flag)) + ipc_devlink_deinit(ipc_imem->ipc_devlink); + if (!ipc_imem_setup_cp_mux_cap_init(ipc_imem, &mux_cfg)) ipc_imem->mux = ipc_mux_init(&mux_cfg, ipc_imem); @@ -548,6 +561,8 @@ static void ipc_imem_run_state_worker(struct work_struct *instance) ctrl_chl_idx++; } + ipc_debugfs_init(ipc_imem); + ipc_task_queue_send_task(ipc_imem, ipc_imem_send_mdm_rdy_cb, 0, NULL, 0, false); @@ -1163,11 +1178,12 @@ void ipc_imem_cleanup(struct iosm_imem *ipc_imem) if (test_and_clear_bit(FULLY_FUNCTIONAL, &ipc_imem->flag)) { ipc_mux_deinit(ipc_imem->mux); + ipc_debugfs_deinit(ipc_imem); ipc_wwan_deinit(ipc_imem->wwan); ipc_port_deinit(ipc_imem->ipc_port); } - if (ipc_imem->ipc_devlink) + if (test_and_clear_bit(IOSM_DEVLINK_INIT, &ipc_imem->flag)) ipc_devlink_deinit(ipc_imem->ipc_devlink); ipc_imem_device_ipc_uninit(ipc_imem); @@ -1263,7 +1279,6 @@ struct iosm_imem *ipc_imem_init(struct iosm_pcie *pcie, unsigned int device_id, ipc_imem->pci_device_id = device_id; - ipc_imem->ev_cdev_write_pending = false; ipc_imem->cp_version = 0; ipc_imem->device_sleep = IPC_HOST_SLEEP_ENTER_SLEEP; @@ -1331,6 +1346,8 @@ struct iosm_imem *ipc_imem_init(struct iosm_pcie *pcie, unsigned int device_id, if (ipc_flash_link_establish(ipc_imem)) goto devlink_channel_fail; + + set_bit(IOSM_DEVLINK_INIT, &ipc_imem->flag); } return ipc_imem; devlink_channel_fail: diff --git a/drivers/net/wwan/iosm/iosm_ipc_imem.h b/drivers/net/wwan/iosm/iosm_ipc_imem.h index 6be6708b4eec..98554e9beb01 100644 --- a/drivers/net/wwan/iosm/iosm_ipc_imem.h +++ b/drivers/net/wwan/iosm/iosm_ipc_imem.h @@ -101,6 +101,7 @@ struct ipc_chnl_cfg; #define IOSM_CHIP_INFO_SIZE_MAX 100 #define FULLY_FUNCTIONAL 0 +#define IOSM_DEVLINK_INIT 1 /* List of the supported UL/DL pipes. */ enum ipc_mem_pipes { @@ -304,6 +305,7 @@ enum ipc_phase { * @sio: IPC SIO data structure pointer * @ipc_port: IPC PORT data structure pointer * @pcie: IPC PCIe + * @trace: IPC trace data structure pointer * @dev: Pointer to device structure * @ipc_requested_state: Expected IPC state on CP. * @channels: Channel list with UL/DL pipe pairs. @@ -335,11 +337,10 @@ enum ipc_phase { * process the irq actions. * @flag: Flag to monitor the state of driver * @td_update_timer_suspended: if true then td update timer suspend - * @ev_cdev_write_pending: 0 means inform the IPC tasklet to pass - * the accumulated uplink buffers to CP. * @ev_mux_net_transmit_pending:0 means inform the IPC tasklet to pass * @reset_det_n: Reset detect flag * @pcie_wake_n: Pcie wake flag + * @debugfs_dir: Debug FS directory for driver-specific entries */ struct iosm_imem { struct iosm_mmio *mmio; @@ -349,6 +350,9 @@ struct iosm_imem { struct iosm_mux *mux; struct iosm_cdev *ipc_port[IPC_MEM_MAX_CHANNELS]; struct iosm_pcie *pcie; +#ifdef CONFIG_WWAN_DEBUGFS + struct iosm_trace *trace; +#endif struct device *dev; enum ipc_mem_device_ipc_state ipc_requested_state; struct ipc_mem_channel channels[IPC_MEM_MAX_CHANNELS]; @@ -374,10 +378,12 @@ struct iosm_imem { u8 ev_irq_pending[IPC_IRQ_VECTORS]; unsigned long flag; u8 td_update_timer_suspended:1, - ev_cdev_write_pending:1, ev_mux_net_transmit_pending:1, reset_det_n:1, pcie_wake_n:1; +#ifdef CONFIG_WWAN_DEBUGFS + struct dentry *debugfs_dir; +#endif }; /** diff --git a/drivers/net/wwan/iosm/iosm_ipc_imem_ops.c b/drivers/net/wwan/iosm/iosm_ipc_imem_ops.c index 825e8e5ffb2a..57304a5adf68 100644 --- a/drivers/net/wwan/iosm/iosm_ipc_imem_ops.c +++ b/drivers/net/wwan/iosm/iosm_ipc_imem_ops.c @@ -41,7 +41,6 @@ void ipc_imem_sys_wwan_close(struct iosm_imem *ipc_imem, int if_id, static int ipc_imem_tq_cdev_write(struct iosm_imem *ipc_imem, int arg, void *msg, size_t size) { - ipc_imem->ev_cdev_write_pending = false; ipc_imem_ul_send(ipc_imem); return 0; @@ -50,11 +49,6 @@ static int ipc_imem_tq_cdev_write(struct iosm_imem *ipc_imem, int arg, /* Through tasklet to do sio write. */ static int ipc_imem_call_cdev_write(struct iosm_imem *ipc_imem) { - if (ipc_imem->ev_cdev_write_pending) - return -1; - - ipc_imem->ev_cdev_write_pending = true; - return ipc_task_queue_send_task(ipc_imem, ipc_imem_tq_cdev_write, 0, NULL, 0, false); } @@ -182,11 +176,14 @@ channel_unavailable: return false; } -/* Release a sio link to CP. */ -void ipc_imem_sys_cdev_close(struct iosm_cdev *ipc_cdev) +/** + * ipc_imem_sys_port_close - Release a sio link to CP. + * @ipc_imem: Imem instance. + * @channel: Channel instance. + */ +void ipc_imem_sys_port_close(struct iosm_imem *ipc_imem, + struct ipc_mem_channel *channel) { - struct iosm_imem *ipc_imem = ipc_cdev->ipc_imem; - struct ipc_mem_channel *channel = ipc_cdev->channel; enum ipc_phase curr_phase; int status = 0; u32 tail = 0; @@ -450,6 +447,7 @@ void ipc_imem_sys_devlink_close(struct iosm_devlink *ipc_devlink) /* Release the pipe resources */ ipc_imem_pipe_cleanup(ipc_imem, &channel->ul_pipe); ipc_imem_pipe_cleanup(ipc_imem, &channel->dl_pipe); + ipc_imem->nr_of_channels--; } void ipc_imem_sys_devlink_notify_rx(struct iosm_devlink *ipc_devlink, @@ -643,6 +641,6 @@ int ipc_imem_sys_devlink_read(struct iosm_devlink *devlink, u8 *data, memcpy(data, skb->data, skb->len); devlink_read_fail: - ipc_pcie_kfree_skb(devlink->pcie, skb); + dev_kfree_skb(skb); return rc; } diff --git a/drivers/net/wwan/iosm/iosm_ipc_imem_ops.h b/drivers/net/wwan/iosm/iosm_ipc_imem_ops.h index f0c88ac5643c..f8afb217d9e2 100644 --- a/drivers/net/wwan/iosm/iosm_ipc_imem_ops.h +++ b/drivers/net/wwan/iosm/iosm_ipc_imem_ops.h @@ -43,12 +43,8 @@ */ struct ipc_mem_channel *ipc_imem_sys_port_open(struct iosm_imem *ipc_imem, int chl_id, int hp_id); - -/** - * ipc_imem_sys_cdev_close - Release a sio link to CP. - * @ipc_cdev: iosm sio instance. - */ -void ipc_imem_sys_cdev_close(struct iosm_cdev *ipc_cdev); +void ipc_imem_sys_port_close(struct iosm_imem *ipc_imem, + struct ipc_mem_channel *channel); /** * ipc_imem_sys_cdev_write - Route the uplink buffer to CP. @@ -145,4 +141,5 @@ int ipc_imem_sys_devlink_read(struct iosm_devlink *ipc_devlink, u8 *data, */ int ipc_imem_sys_devlink_write(struct iosm_devlink *ipc_devlink, unsigned char *buf, int count); + #endif diff --git a/drivers/net/wwan/iosm/iosm_ipc_mmio.c b/drivers/net/wwan/iosm/iosm_ipc_mmio.c index 09f94c123531..f09e5e77a2a5 100644 --- a/drivers/net/wwan/iosm/iosm_ipc_mmio.c +++ b/drivers/net/wwan/iosm/iosm_ipc_mmio.c @@ -192,7 +192,7 @@ void ipc_mmio_config(struct iosm_mmio *ipc_mmio) iowrite64(0, ipc_mmio->base + ipc_mmio->offset.ap_win_end); iowrite64(ipc_mmio->context_info_addr, - ipc_mmio->base + ipc_mmio->offset.context_info); + ipc_mmio->base + ipc_mmio->offset.context_info); } void ipc_mmio_set_psi_addr_and_size(struct iosm_mmio *ipc_mmio, dma_addr_t addr, diff --git a/drivers/net/wwan/iosm/iosm_ipc_mux.c b/drivers/net/wwan/iosm/iosm_ipc_mux.c index c1c77ce699da..8e66ffe92055 100644 --- a/drivers/net/wwan/iosm/iosm_ipc_mux.c +++ b/drivers/net/wwan/iosm/iosm_ipc_mux.c @@ -97,7 +97,7 @@ static bool ipc_mux_session_open(struct iosm_mux *ipc_mux, /* Search for a free session interface id. */ if_id = le32_to_cpu(session_open->if_id); - if (if_id < 0 || if_id >= ipc_mux->nr_sessions) { + if (if_id < 0 || if_id >= IPC_MEM_MUX_IP_SESSION_ENTRIES) { dev_err(ipc_mux->dev, "invalid interface id=%d", if_id); return false; } @@ -129,6 +129,7 @@ static bool ipc_mux_session_open(struct iosm_mux *ipc_mux, /* Save and return the assigned if id. */ session_open->if_id = cpu_to_le32(if_id); + ipc_mux->nr_sessions++; return true; } @@ -151,7 +152,7 @@ static void ipc_mux_session_close(struct iosm_mux *ipc_mux, /* Copy the session interface id. */ if_id = le32_to_cpu(msg->if_id); - if (if_id < 0 || if_id >= ipc_mux->nr_sessions) { + if (if_id < 0 || if_id >= IPC_MEM_MUX_IP_SESSION_ENTRIES) { dev_err(ipc_mux->dev, "invalid session id %d", if_id); return; } @@ -170,6 +171,7 @@ static void ipc_mux_session_close(struct iosm_mux *ipc_mux, ipc_mux->session[if_id].flow_ctl_mask = 0; ipc_mux_session_reset(ipc_mux, if_id); + ipc_mux->nr_sessions--; } static void ipc_mux_channel_close(struct iosm_mux *ipc_mux, @@ -178,7 +180,7 @@ static void ipc_mux_channel_close(struct iosm_mux *ipc_mux, int i; /* Free pending session UL packet. */ - for (i = 0; i < ipc_mux->nr_sessions; i++) + for (i = 0; i < IPC_MEM_MUX_IP_SESSION_ENTRIES; i++) if (ipc_mux->session[i].wwan) ipc_mux_session_reset(ipc_mux, i); @@ -244,6 +246,11 @@ static int ipc_mux_schedule(struct iosm_mux *ipc_mux, union mux_msg *msg) /* Release an IP session. */ ipc_mux->event = MUX_E_MUX_SESSION_CLOSE; ipc_mux_session_close(ipc_mux, &msg->session_close); + if (!ipc_mux->nr_sessions) { + ipc_mux->event = MUX_E_MUX_CHANNEL_CLOSE; + ipc_mux_channel_close(ipc_mux, + &msg->channel_close); + } ret = ipc_mux->channel_id; goto out; @@ -281,7 +288,6 @@ struct iosm_mux *ipc_mux_init(struct ipc_mux_config *mux_cfg, ipc_mux->protocol = mux_cfg->protocol; ipc_mux->ul_flow = mux_cfg->ul_flow; - ipc_mux->nr_sessions = mux_cfg->nr_sessions; ipc_mux->instance_id = mux_cfg->instance_id; ipc_mux->wwan_q_offset = 0; @@ -340,7 +346,7 @@ static void ipc_mux_restart_tx_for_all_sessions(struct iosm_mux *ipc_mux) struct mux_session *session; int idx; - for (idx = 0; idx < ipc_mux->nr_sessions; idx++) { + for (idx = 0; idx < IPC_MEM_MUX_IP_SESSION_ENTRIES; idx++) { session = &ipc_mux->session[idx]; if (!session->wwan) @@ -365,7 +371,7 @@ static void ipc_mux_stop_netif_for_all_sessions(struct iosm_mux *ipc_mux) struct mux_session *session; int idx; - for (idx = 0; idx < ipc_mux->nr_sessions; idx++) { + for (idx = 0; idx < IPC_MEM_MUX_IP_SESSION_ENTRIES; idx++) { session = &ipc_mux->session[idx]; if (!session->wwan) @@ -387,7 +393,7 @@ void ipc_mux_check_n_restart_tx(struct iosm_mux *ipc_mux) int ipc_mux_get_max_sessions(struct iosm_mux *ipc_mux) { - return ipc_mux ? ipc_mux->nr_sessions : -EFAULT; + return ipc_mux ? IPC_MEM_MUX_IP_SESSION_ENTRIES : -EFAULT; } enum ipc_mux_protocol ipc_mux_get_active_protocol(struct iosm_mux *ipc_mux) @@ -435,9 +441,11 @@ void ipc_mux_deinit(struct iosm_mux *ipc_mux) return; ipc_mux_stop_netif_for_all_sessions(ipc_mux); - channel_close = &mux_msg.channel_close; - channel_close->event = MUX_E_MUX_CHANNEL_CLOSE; - ipc_mux_schedule(ipc_mux, &mux_msg); + if (ipc_mux->state == MUX_S_ACTIVE) { + channel_close = &mux_msg.channel_close; + channel_close->event = MUX_E_MUX_CHANNEL_CLOSE; + ipc_mux_schedule(ipc_mux, &mux_msg); + } /* Empty the ADB free list. */ free_list = &ipc_mux->ul_adb.free_list; diff --git a/drivers/net/wwan/iosm/iosm_ipc_mux.h b/drivers/net/wwan/iosm/iosm_ipc_mux.h index ddd2cd0bd911..88debaa1ed31 100644 --- a/drivers/net/wwan/iosm/iosm_ipc_mux.h +++ b/drivers/net/wwan/iosm/iosm_ipc_mux.h @@ -278,7 +278,6 @@ struct iosm_mux { struct ipc_mux_config { enum ipc_mux_protocol protocol; enum ipc_mux_ul_flow ul_flow; - int nr_sessions; int instance_id; }; diff --git a/drivers/net/wwan/iosm/iosm_ipc_mux_codec.c b/drivers/net/wwan/iosm/iosm_ipc_mux_codec.c index bdb2d32cdb6d..40fb54a0513e 100644 --- a/drivers/net/wwan/iosm/iosm_ipc_mux_codec.c +++ b/drivers/net/wwan/iosm/iosm_ipc_mux_codec.c @@ -175,7 +175,7 @@ static int ipc_mux_dl_dlcmds_decode_process(struct iosm_mux *ipc_mux, switch (le32_to_cpu(cmdh->command_type)) { case MUX_LITE_CMD_FLOW_CTL: - if (cmdh->if_id >= ipc_mux->nr_sessions) { + if (cmdh->if_id >= IPC_MEM_MUX_IP_SESSION_ENTRIES) { dev_err(ipc_mux->dev, "if_id [%d] not valid", cmdh->if_id); return -EINVAL; /* No session interface id. */ @@ -307,13 +307,13 @@ static void ipc_mux_dl_fcth_decode(struct iosm_mux *ipc_mux, } if_id = fct->if_id; - if (if_id >= ipc_mux->nr_sessions) { + if (if_id >= IPC_MEM_MUX_IP_SESSION_ENTRIES) { dev_err(ipc_mux->dev, "not supported if_id: %d", if_id); return; } /* Is the session active ? */ - if_id = array_index_nospec(if_id, ipc_mux->nr_sessions); + if_id = array_index_nospec(if_id, IPC_MEM_MUX_IP_SESSION_ENTRIES); wwan = ipc_mux->session[if_id].wwan; if (!wwan) { dev_err(ipc_mux->dev, "session Net ID is NULL"); @@ -355,13 +355,13 @@ static void ipc_mux_dl_adgh_decode(struct iosm_mux *ipc_mux, } if_id = adgh->if_id; - if (if_id >= ipc_mux->nr_sessions) { + if (if_id >= IPC_MEM_MUX_IP_SESSION_ENTRIES) { dev_err(ipc_mux->dev, "invalid if_id while decoding %d", if_id); return; } /* Is the session active ? */ - if_id = array_index_nospec(if_id, ipc_mux->nr_sessions); + if_id = array_index_nospec(if_id, IPC_MEM_MUX_IP_SESSION_ENTRIES); wwan = ipc_mux->session[if_id].wwan; if (!wwan) { dev_err(ipc_mux->dev, "session Net ID is NULL"); @@ -538,7 +538,7 @@ static void ipc_mux_stop_tx_for_all_sessions(struct iosm_mux *ipc_mux) struct mux_session *session; int idx; - for (idx = 0; idx < ipc_mux->nr_sessions; idx++) { + for (idx = 0; idx < IPC_MEM_MUX_IP_SESSION_ENTRIES; idx++) { session = &ipc_mux->session[idx]; if (!session->wwan) @@ -563,7 +563,7 @@ static bool ipc_mux_lite_send_qlt(struct iosm_mux *ipc_mux) qlt_size = offsetof(struct ipc_mem_lite_gen_tbl, vfl) + MUX_QUEUE_LEVEL * sizeof(struct mux_lite_vfl); - for (i = 0; i < ipc_mux->nr_sessions; i++) { + for (i = 0; i < IPC_MEM_MUX_IP_SESSION_ENTRIES; i++) { session = &ipc_mux->session[i]; if (!session->wwan || session->flow_ctl_mask) @@ -777,13 +777,13 @@ bool ipc_mux_ul_data_encode(struct iosm_mux *ipc_mux) ipc_mux->adb_prep_ongoing = true; - for (i = 0; i < ipc_mux->nr_sessions; i++) { + for (i = 0; i < IPC_MEM_MUX_IP_SESSION_ENTRIES; i++) { session_id = ipc_mux->rr_next_session; session = &ipc_mux->session[session_id]; /* Go to next handle rr_next_session overflow */ ipc_mux->rr_next_session++; - if (ipc_mux->rr_next_session >= ipc_mux->nr_sessions) + if (ipc_mux->rr_next_session >= IPC_MEM_MUX_IP_SESSION_ENTRIES) ipc_mux->rr_next_session = 0; if (!session->wwan || session->flow_ctl_mask || diff --git a/drivers/net/wwan/iosm/iosm_ipc_pcie.c b/drivers/net/wwan/iosm/iosm_ipc_pcie.c index 2fe88b8be348..d73894e2a84e 100644 --- a/drivers/net/wwan/iosm/iosm_ipc_pcie.c +++ b/drivers/net/wwan/iosm/iosm_ipc_pcie.c @@ -363,67 +363,22 @@ static int __maybe_unused ipc_pcie_resume_s2idle(struct iosm_pcie *ipc_pcie) int __maybe_unused ipc_pcie_suspend(struct iosm_pcie *ipc_pcie) { - struct pci_dev *pdev; - int ret; - - pdev = ipc_pcie->pci; - - /* Execute D3 one time. */ - if (pdev->current_state != PCI_D0) { - dev_dbg(ipc_pcie->dev, "done for PM=%d", pdev->current_state); - return 0; - } - /* The HAL shall ask the shared memory layer whether D3 is allowed. */ ipc_imem_pm_suspend(ipc_pcie->imem); - /* Save the PCI configuration space of a device before suspending. */ - ret = pci_save_state(pdev); - - if (ret) { - dev_err(ipc_pcie->dev, "pci_save_state error=%d", ret); - return ret; - } - - /* Set the power state of a PCI device. - * Transition a device to a new power state, using the device's PCI PM - * registers. - */ - ret = pci_set_power_state(pdev, PCI_D3cold); - - if (ret) { - dev_err(ipc_pcie->dev, "pci_set_power_state error=%d", ret); - return ret; - } - dev_dbg(ipc_pcie->dev, "SUSPEND done"); - return ret; + return 0; } int __maybe_unused ipc_pcie_resume(struct iosm_pcie *ipc_pcie) { - int ret; - - /* Set the power state of a PCI device. - * Transition a device to a new power state, using the device's PCI PM - * registers. - */ - ret = pci_set_power_state(ipc_pcie->pci, PCI_D0); - - if (ret) { - dev_err(ipc_pcie->dev, "pci_set_power_state error=%d", ret); - return ret; - } - - pci_restore_state(ipc_pcie->pci); - /* The HAL shall inform the shared memory layer that the device is * active. */ ipc_imem_pm_resume(ipc_pcie->imem); dev_dbg(ipc_pcie->dev, "RESUME done"); - return ret; + return 0; } static int __maybe_unused ipc_pcie_suspend_cb(struct device *dev) diff --git a/drivers/net/wwan/iosm/iosm_ipc_port.c b/drivers/net/wwan/iosm/iosm_ipc_port.c index beb944847398..b6d81c627277 100644 --- a/drivers/net/wwan/iosm/iosm_ipc_port.c +++ b/drivers/net/wwan/iosm/iosm_ipc_port.c @@ -27,7 +27,7 @@ static void ipc_port_ctrl_stop(struct wwan_port *port) { struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port); - ipc_imem_sys_cdev_close(ipc_port); + ipc_imem_sys_port_close(ipc_port->ipc_imem, ipc_port->channel); } /* transfer control data to modem */ diff --git a/drivers/net/wwan/iosm/iosm_ipc_trace.c b/drivers/net/wwan/iosm/iosm_ipc_trace.c new file mode 100644 index 000000000000..eeecfa3d10c5 --- /dev/null +++ b/drivers/net/wwan/iosm/iosm_ipc_trace.c @@ -0,0 +1,182 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2020-2021 Intel Corporation. + */ + +#include <linux/wwan.h> +#include "iosm_ipc_trace.h" + +/* sub buffer size and number of sub buffer */ +#define IOSM_TRC_SUB_BUFF_SIZE 131072 +#define IOSM_TRC_N_SUB_BUFF 32 + +#define IOSM_TRC_FILE_PERM 0600 + +#define IOSM_TRC_DEBUGFS_TRACE "trace" +#define IOSM_TRC_DEBUGFS_TRACE_CTRL "trace_ctrl" + +/** + * ipc_trace_port_rx - Receive trace packet from cp and write to relay buffer + * @ipc_imem: Pointer to iosm_imem structure + * @skb: Pointer to struct sk_buff + */ +void ipc_trace_port_rx(struct iosm_imem *ipc_imem, struct sk_buff *skb) +{ + struct iosm_trace *ipc_trace = ipc_imem->trace; + + if (ipc_trace->ipc_rchan) + relay_write(ipc_trace->ipc_rchan, skb->data, skb->len); + + dev_kfree_skb(skb); +} + +/* Creates relay file in debugfs. */ +static struct dentry * +ipc_trace_create_buf_file_handler(const char *filename, + struct dentry *parent, + umode_t mode, + struct rchan_buf *buf, + int *is_global) +{ + *is_global = 1; + return debugfs_create_file(filename, mode, parent, buf, + &relay_file_operations); +} + +/* Removes relay file from debugfs. */ +static int ipc_trace_remove_buf_file_handler(struct dentry *dentry) +{ + debugfs_remove(dentry); + return 0; +} + +static int ipc_trace_subbuf_start_handler(struct rchan_buf *buf, void *subbuf, + void *prev_subbuf, + size_t prev_padding) +{ + if (relay_buf_full(buf)) { + pr_err_ratelimited("Relay_buf full dropping traces"); + return 0; + } + + return 1; +} + +/* Relay interface callbacks */ +static struct rchan_callbacks relay_callbacks = { + .subbuf_start = ipc_trace_subbuf_start_handler, + .create_buf_file = ipc_trace_create_buf_file_handler, + .remove_buf_file = ipc_trace_remove_buf_file_handler, +}; + +/* Copy the trace control mode to user buffer */ +static ssize_t ipc_trace_ctrl_file_read(struct file *filp, char __user *buffer, + size_t count, loff_t *ppos) +{ + struct iosm_trace *ipc_trace = filp->private_data; + char buf[16]; + int len; + + mutex_lock(&ipc_trace->trc_mutex); + len = snprintf(buf, sizeof(buf), "%d\n", ipc_trace->mode); + mutex_unlock(&ipc_trace->trc_mutex); + + return simple_read_from_buffer(buffer, count, ppos, buf, len); +} + +/* Open and close the trace channel depending on user input */ +static ssize_t ipc_trace_ctrl_file_write(struct file *filp, + const char __user *buffer, + size_t count, loff_t *ppos) +{ + struct iosm_trace *ipc_trace = filp->private_data; + unsigned long val; + int ret; + + ret = kstrtoul_from_user(buffer, count, 10, &val); + if (ret) + return ret; + + mutex_lock(&ipc_trace->trc_mutex); + if (val == TRACE_ENABLE && ipc_trace->mode != TRACE_ENABLE) { + ipc_trace->channel = ipc_imem_sys_port_open(ipc_trace->ipc_imem, + ipc_trace->chl_id, + IPC_HP_CDEV_OPEN); + if (!ipc_trace->channel) { + ret = -EIO; + goto unlock; + } + ipc_trace->mode = TRACE_ENABLE; + } else if (val == TRACE_DISABLE && ipc_trace->mode != TRACE_DISABLE) { + ipc_trace->mode = TRACE_DISABLE; + /* close trace channel */ + ipc_imem_sys_port_close(ipc_trace->ipc_imem, + ipc_trace->channel); + relay_flush(ipc_trace->ipc_rchan); + } + ret = count; +unlock: + mutex_unlock(&ipc_trace->trc_mutex); + return ret; +} + +static const struct file_operations ipc_trace_fops = { + .open = simple_open, + .write = ipc_trace_ctrl_file_write, + .read = ipc_trace_ctrl_file_read, +}; + +/** + * ipc_trace_init - Create trace interface & debugfs entries + * @ipc_imem: Pointer to iosm_imem structure + * + * Returns: Pointer to trace instance on success else NULL + */ +struct iosm_trace *ipc_trace_init(struct iosm_imem *ipc_imem) +{ + struct ipc_chnl_cfg chnl_cfg = { 0 }; + struct iosm_trace *ipc_trace; + + ipc_chnl_cfg_get(&chnl_cfg, IPC_MEM_CTRL_CHL_ID_3); + ipc_imem_channel_init(ipc_imem, IPC_CTYPE_CTRL, chnl_cfg, + IRQ_MOD_OFF); + + ipc_trace = kzalloc(sizeof(*ipc_trace), GFP_KERNEL); + if (!ipc_trace) + return NULL; + + ipc_trace->mode = TRACE_DISABLE; + ipc_trace->dev = ipc_imem->dev; + ipc_trace->ipc_imem = ipc_imem; + ipc_trace->chl_id = IPC_MEM_CTRL_CHL_ID_3; + + mutex_init(&ipc_trace->trc_mutex); + + ipc_trace->ctrl_file = debugfs_create_file(IOSM_TRC_DEBUGFS_TRACE_CTRL, + IOSM_TRC_FILE_PERM, + ipc_imem->debugfs_dir, + ipc_trace, &ipc_trace_fops); + + ipc_trace->ipc_rchan = relay_open(IOSM_TRC_DEBUGFS_TRACE, + ipc_imem->debugfs_dir, + IOSM_TRC_SUB_BUFF_SIZE, + IOSM_TRC_N_SUB_BUFF, + &relay_callbacks, NULL); + + return ipc_trace; +} + +/** + * ipc_trace_deinit - Closing relayfs, removing debugfs entries + * @ipc_trace: Pointer to the iosm_trace data struct + */ +void ipc_trace_deinit(struct iosm_trace *ipc_trace) +{ + if (!ipc_trace) + return; + + debugfs_remove(ipc_trace->ctrl_file); + relay_close(ipc_trace->ipc_rchan); + mutex_destroy(&ipc_trace->trc_mutex); + kfree(ipc_trace); +} diff --git a/drivers/net/wwan/iosm/iosm_ipc_trace.h b/drivers/net/wwan/iosm/iosm_ipc_trace.h new file mode 100644 index 000000000000..5ebe7790585c --- /dev/null +++ b/drivers/net/wwan/iosm/iosm_ipc_trace.h @@ -0,0 +1,74 @@ +/* SPDX-License-Identifier: GPL-2.0-only + * + * Copyright (C) 2020-2021 Intel Corporation. + */ + +#ifndef IOSM_IPC_TRACE_H +#define IOSM_IPC_TRACE_H + +#include <linux/debugfs.h> +#include <linux/relay.h> + +#include "iosm_ipc_chnl_cfg.h" +#include "iosm_ipc_imem_ops.h" + +/** + * enum trace_ctrl_mode - State of trace channel + * @TRACE_DISABLE: mode for disable trace + * @TRACE_ENABLE: mode for enable trace + */ +enum trace_ctrl_mode { + TRACE_DISABLE = 0, + TRACE_ENABLE, +}; + +/** + * struct iosm_trace - Struct for trace interface + * @ipc_rchan: Pointer to relay channel + * @ctrl_file: Pointer to trace control file + * @ipc_imem: Imem instance + * @dev: Pointer to device struct + * @channel: Channel instance + * @chl_id: Channel Indentifier + * @trc_mutex: Mutex used for read and write mode + * @mode: Mode for enable and disable trace + */ + +struct iosm_trace { + struct rchan *ipc_rchan; + struct dentry *ctrl_file; + struct iosm_imem *ipc_imem; + struct device *dev; + struct ipc_mem_channel *channel; + enum ipc_channel_id chl_id; + struct mutex trc_mutex; /* Mutex used for read and write mode */ + enum trace_ctrl_mode mode; +}; + +#ifdef CONFIG_WWAN_DEBUGFS + +static inline bool ipc_is_trace_channel(struct iosm_imem *ipc_mem, u16 chl_id) +{ + return ipc_mem->trace && ipc_mem->trace->chl_id == chl_id; +} + +struct iosm_trace *ipc_trace_init(struct iosm_imem *ipc_imem); +void ipc_trace_deinit(struct iosm_trace *ipc_trace); +void ipc_trace_port_rx(struct iosm_imem *ipc_imem, struct sk_buff *skb); + +#else + +static inline bool ipc_is_trace_channel(struct iosm_imem *ipc_mem, u16 chl_id) +{ + return false; +} + +static inline void ipc_trace_port_rx(struct iosm_imem *ipc_imem, + struct sk_buff *skb) +{ + dev_kfree_skb(skb); +} + +#endif + +#endif diff --git a/drivers/net/wwan/iosm/iosm_ipc_wwan.c b/drivers/net/wwan/iosm/iosm_ipc_wwan.c index b571d9cedba4..27151148c782 100644 --- a/drivers/net/wwan/iosm/iosm_ipc_wwan.c +++ b/drivers/net/wwan/iosm/iosm_ipc_wwan.c @@ -8,6 +8,7 @@ #include <linux/if_link.h> #include <linux/rtnetlink.h> #include <linux/wwan.h> +#include <net/pkt_sched.h> #include "iosm_ipc_chnl_cfg.h" #include "iosm_ipc_imem_ops.h" @@ -159,7 +160,7 @@ static void ipc_wwan_setup(struct net_device *iosm_dev) { iosm_dev->header_ops = NULL; iosm_dev->hard_header_len = 0; - iosm_dev->priv_flags |= IFF_NO_QUEUE; + iosm_dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; iosm_dev->type = ARPHRD_NONE; iosm_dev->mtu = ETH_DATA_LEN; diff --git a/drivers/net/wwan/iosm/iosm_ipc_wwan.h b/drivers/net/wwan/iosm/iosm_ipc_wwan.h index 4925f22dff0a..a23e926398ff 100644 --- a/drivers/net/wwan/iosm/iosm_ipc_wwan.h +++ b/drivers/net/wwan/iosm/iosm_ipc_wwan.h @@ -42,14 +42,4 @@ int ipc_wwan_receive(struct iosm_wwan *ipc_wwan, struct sk_buff *skb_arg, * */ void ipc_wwan_tx_flowctrl(struct iosm_wwan *ipc_wwan, int id, bool on); - -/** - * ipc_wwan_is_tx_stopped - Checks if Tx stopped for a Interface id. - * @ipc_wwan: Pointer to wwan instance - * @id: Ipc mux channel session id - * - * Return: true if stopped, false otherwise - */ -bool ipc_wwan_is_tx_stopped(struct iosm_wwan *ipc_wwan, int id); - #endif diff --git a/drivers/net/wwan/qcom_bam_dmux.c b/drivers/net/wwan/qcom_bam_dmux.c new file mode 100644 index 000000000000..5dfa2eba6014 --- /dev/null +++ b/drivers/net/wwan/qcom_bam_dmux.c @@ -0,0 +1,907 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Qualcomm BAM-DMUX WWAN network driver + * Copyright (c) 2020, Stephan Gerhold <stephan@gerhold.net> + */ + +#include <linux/atomic.h> +#include <linux/bitops.h> +#include <linux/completion.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/if_arp.h> +#include <linux/interrupt.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/netdevice.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/soc/qcom/smem_state.h> +#include <linux/spinlock.h> +#include <linux/wait.h> +#include <linux/workqueue.h> +#include <net/pkt_sched.h> + +#define BAM_DMUX_BUFFER_SIZE SZ_2K +#define BAM_DMUX_HDR_SIZE sizeof(struct bam_dmux_hdr) +#define BAM_DMUX_MAX_DATA_SIZE (BAM_DMUX_BUFFER_SIZE - BAM_DMUX_HDR_SIZE) +#define BAM_DMUX_NUM_SKB 32 + +#define BAM_DMUX_HDR_MAGIC 0x33fc + +#define BAM_DMUX_AUTOSUSPEND_DELAY 1000 +#define BAM_DMUX_REMOTE_TIMEOUT msecs_to_jiffies(2000) + +enum { + BAM_DMUX_CMD_DATA, + BAM_DMUX_CMD_OPEN, + BAM_DMUX_CMD_CLOSE, +}; + +enum { + BAM_DMUX_CH_DATA_0, + BAM_DMUX_CH_DATA_1, + BAM_DMUX_CH_DATA_2, + BAM_DMUX_CH_DATA_3, + BAM_DMUX_CH_DATA_4, + BAM_DMUX_CH_DATA_5, + BAM_DMUX_CH_DATA_6, + BAM_DMUX_CH_DATA_7, + BAM_DMUX_NUM_CH +}; + +struct bam_dmux_hdr { + u16 magic; + u8 signal; + u8 cmd; + u8 pad; + u8 ch; + u16 len; +}; + +struct bam_dmux_skb_dma { + struct bam_dmux *dmux; + struct sk_buff *skb; + dma_addr_t addr; +}; + +struct bam_dmux { + struct device *dev; + + int pc_irq; + bool pc_state, pc_ack_state; + struct qcom_smem_state *pc, *pc_ack; + u32 pc_mask, pc_ack_mask; + wait_queue_head_t pc_wait; + struct completion pc_ack_completion; + + struct dma_chan *rx, *tx; + struct bam_dmux_skb_dma rx_skbs[BAM_DMUX_NUM_SKB]; + struct bam_dmux_skb_dma tx_skbs[BAM_DMUX_NUM_SKB]; + spinlock_t tx_lock; /* Protect tx_skbs, tx_next_skb */ + unsigned int tx_next_skb; + atomic_long_t tx_deferred_skb; + struct work_struct tx_wakeup_work; + + DECLARE_BITMAP(remote_channels, BAM_DMUX_NUM_CH); + struct work_struct register_netdev_work; + struct net_device *netdevs[BAM_DMUX_NUM_CH]; +}; + +struct bam_dmux_netdev { + struct bam_dmux *dmux; + u8 ch; +}; + +static void bam_dmux_pc_vote(struct bam_dmux *dmux, bool enable) +{ + reinit_completion(&dmux->pc_ack_completion); + qcom_smem_state_update_bits(dmux->pc, dmux->pc_mask, + enable ? dmux->pc_mask : 0); +} + +static void bam_dmux_pc_ack(struct bam_dmux *dmux) +{ + qcom_smem_state_update_bits(dmux->pc_ack, dmux->pc_ack_mask, + dmux->pc_ack_state ? 0 : dmux->pc_ack_mask); + dmux->pc_ack_state = !dmux->pc_ack_state; +} + +static bool bam_dmux_skb_dma_map(struct bam_dmux_skb_dma *skb_dma, + enum dma_data_direction dir) +{ + struct device *dev = skb_dma->dmux->dev; + + skb_dma->addr = dma_map_single(dev, skb_dma->skb->data, skb_dma->skb->len, dir); + if (dma_mapping_error(dev, skb_dma->addr)) { + dev_err(dev, "Failed to DMA map buffer\n"); + skb_dma->addr = 0; + return false; + } + + return true; +} + +static void bam_dmux_skb_dma_unmap(struct bam_dmux_skb_dma *skb_dma, + enum dma_data_direction dir) +{ + dma_unmap_single(skb_dma->dmux->dev, skb_dma->addr, skb_dma->skb->len, dir); + skb_dma->addr = 0; +} + +static void bam_dmux_tx_wake_queues(struct bam_dmux *dmux) +{ + int i; + + dev_dbg(dmux->dev, "wake queues\n"); + + for (i = 0; i < BAM_DMUX_NUM_CH; ++i) { + struct net_device *netdev = dmux->netdevs[i]; + + if (netdev && netif_running(netdev)) + netif_wake_queue(netdev); + } +} + +static void bam_dmux_tx_stop_queues(struct bam_dmux *dmux) +{ + int i; + + dev_dbg(dmux->dev, "stop queues\n"); + + for (i = 0; i < BAM_DMUX_NUM_CH; ++i) { + struct net_device *netdev = dmux->netdevs[i]; + + if (netdev) + netif_stop_queue(netdev); + } +} + +static void bam_dmux_tx_done(struct bam_dmux_skb_dma *skb_dma) +{ + struct bam_dmux *dmux = skb_dma->dmux; + unsigned long flags; + + pm_runtime_mark_last_busy(dmux->dev); + pm_runtime_put_autosuspend(dmux->dev); + + if (skb_dma->addr) + bam_dmux_skb_dma_unmap(skb_dma, DMA_TO_DEVICE); + + spin_lock_irqsave(&dmux->tx_lock, flags); + skb_dma->skb = NULL; + if (skb_dma == &dmux->tx_skbs[dmux->tx_next_skb % BAM_DMUX_NUM_SKB]) + bam_dmux_tx_wake_queues(dmux); + spin_unlock_irqrestore(&dmux->tx_lock, flags); +} + +static void bam_dmux_tx_callback(void *data) +{ + struct bam_dmux_skb_dma *skb_dma = data; + struct sk_buff *skb = skb_dma->skb; + + bam_dmux_tx_done(skb_dma); + dev_consume_skb_any(skb); +} + +static bool bam_dmux_skb_dma_submit_tx(struct bam_dmux_skb_dma *skb_dma) +{ + struct bam_dmux *dmux = skb_dma->dmux; + struct dma_async_tx_descriptor *desc; + + desc = dmaengine_prep_slave_single(dmux->tx, skb_dma->addr, + skb_dma->skb->len, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT); + if (!desc) { + dev_err(dmux->dev, "Failed to prepare TX DMA buffer\n"); + return false; + } + + desc->callback = bam_dmux_tx_callback; + desc->callback_param = skb_dma; + desc->cookie = dmaengine_submit(desc); + return true; +} + +static struct bam_dmux_skb_dma * +bam_dmux_tx_queue(struct bam_dmux *dmux, struct sk_buff *skb) +{ + struct bam_dmux_skb_dma *skb_dma; + unsigned long flags; + + spin_lock_irqsave(&dmux->tx_lock, flags); + + skb_dma = &dmux->tx_skbs[dmux->tx_next_skb % BAM_DMUX_NUM_SKB]; + if (skb_dma->skb) { + bam_dmux_tx_stop_queues(dmux); + spin_unlock_irqrestore(&dmux->tx_lock, flags); + return NULL; + } + skb_dma->skb = skb; + + dmux->tx_next_skb++; + if (dmux->tx_skbs[dmux->tx_next_skb % BAM_DMUX_NUM_SKB].skb) + bam_dmux_tx_stop_queues(dmux); + + spin_unlock_irqrestore(&dmux->tx_lock, flags); + return skb_dma; +} + +static int bam_dmux_send_cmd(struct bam_dmux_netdev *bndev, u8 cmd) +{ + struct bam_dmux *dmux = bndev->dmux; + struct bam_dmux_skb_dma *skb_dma; + struct bam_dmux_hdr *hdr; + struct sk_buff *skb; + int ret; + + skb = alloc_skb(sizeof(*hdr), GFP_KERNEL); + if (!skb) + return -ENOMEM; + + hdr = skb_put_zero(skb, sizeof(*hdr)); + hdr->magic = BAM_DMUX_HDR_MAGIC; + hdr->cmd = cmd; + hdr->ch = bndev->ch; + + skb_dma = bam_dmux_tx_queue(dmux, skb); + if (!skb_dma) { + ret = -EAGAIN; + goto free_skb; + } + + ret = pm_runtime_get_sync(dmux->dev); + if (ret < 0) + goto tx_fail; + + if (!bam_dmux_skb_dma_map(skb_dma, DMA_TO_DEVICE)) { + ret = -ENOMEM; + goto tx_fail; + } + + if (!bam_dmux_skb_dma_submit_tx(skb_dma)) { + ret = -EIO; + goto tx_fail; + } + + dma_async_issue_pending(dmux->tx); + return 0; + +tx_fail: + bam_dmux_tx_done(skb_dma); +free_skb: + dev_kfree_skb(skb); + return ret; +} + +static int bam_dmux_netdev_open(struct net_device *netdev) +{ + struct bam_dmux_netdev *bndev = netdev_priv(netdev); + int ret; + + ret = bam_dmux_send_cmd(bndev, BAM_DMUX_CMD_OPEN); + if (ret) + return ret; + + netif_start_queue(netdev); + return 0; +} + +static int bam_dmux_netdev_stop(struct net_device *netdev) +{ + struct bam_dmux_netdev *bndev = netdev_priv(netdev); + + netif_stop_queue(netdev); + bam_dmux_send_cmd(bndev, BAM_DMUX_CMD_CLOSE); + return 0; +} + +static unsigned int needed_room(unsigned int avail, unsigned int needed) +{ + if (avail >= needed) + return 0; + return needed - avail; +} + +static int bam_dmux_tx_prepare_skb(struct bam_dmux_netdev *bndev, + struct sk_buff *skb) +{ + unsigned int head = needed_room(skb_headroom(skb), BAM_DMUX_HDR_SIZE); + unsigned int pad = sizeof(u32) - skb->len % sizeof(u32); + unsigned int tail = needed_room(skb_tailroom(skb), pad); + struct bam_dmux_hdr *hdr; + int ret; + + if (head || tail || skb_cloned(skb)) { + ret = pskb_expand_head(skb, head, tail, GFP_ATOMIC); + if (ret) + return ret; + } + + hdr = skb_push(skb, sizeof(*hdr)); + hdr->magic = BAM_DMUX_HDR_MAGIC; + hdr->signal = 0; + hdr->cmd = BAM_DMUX_CMD_DATA; + hdr->pad = pad; + hdr->ch = bndev->ch; + hdr->len = skb->len - sizeof(*hdr); + if (pad) + skb_put_zero(skb, pad); + + return 0; +} + +static netdev_tx_t bam_dmux_netdev_start_xmit(struct sk_buff *skb, + struct net_device *netdev) +{ + struct bam_dmux_netdev *bndev = netdev_priv(netdev); + struct bam_dmux *dmux = bndev->dmux; + struct bam_dmux_skb_dma *skb_dma; + int active, ret; + + skb_dma = bam_dmux_tx_queue(dmux, skb); + if (!skb_dma) + return NETDEV_TX_BUSY; + + active = pm_runtime_get(dmux->dev); + if (active < 0 && active != -EINPROGRESS) + goto drop; + + ret = bam_dmux_tx_prepare_skb(bndev, skb); + if (ret) + goto drop; + + if (!bam_dmux_skb_dma_map(skb_dma, DMA_TO_DEVICE)) + goto drop; + + if (active <= 0) { + /* Cannot sleep here so mark skb for wakeup handler and return */ + if (!atomic_long_fetch_or(BIT(skb_dma - dmux->tx_skbs), + &dmux->tx_deferred_skb)) + queue_pm_work(&dmux->tx_wakeup_work); + return NETDEV_TX_OK; + } + + if (!bam_dmux_skb_dma_submit_tx(skb_dma)) + goto drop; + + dma_async_issue_pending(dmux->tx); + return NETDEV_TX_OK; + +drop: + bam_dmux_tx_done(skb_dma); + dev_kfree_skb_any(skb); + return NETDEV_TX_OK; +} + +static void bam_dmux_tx_wakeup_work(struct work_struct *work) +{ + struct bam_dmux *dmux = container_of(work, struct bam_dmux, tx_wakeup_work); + unsigned long pending; + int ret, i; + + ret = pm_runtime_resume_and_get(dmux->dev); + if (ret < 0) { + dev_err(dmux->dev, "Failed to resume: %d\n", ret); + return; + } + + pending = atomic_long_xchg(&dmux->tx_deferred_skb, 0); + if (!pending) + goto out; + + dev_dbg(dmux->dev, "pending skbs after wakeup: %#lx\n", pending); + for_each_set_bit(i, &pending, BAM_DMUX_NUM_SKB) { + bam_dmux_skb_dma_submit_tx(&dmux->tx_skbs[i]); + } + dma_async_issue_pending(dmux->tx); + +out: + pm_runtime_mark_last_busy(dmux->dev); + pm_runtime_put_autosuspend(dmux->dev); +} + +static const struct net_device_ops bam_dmux_ops = { + .ndo_open = bam_dmux_netdev_open, + .ndo_stop = bam_dmux_netdev_stop, + .ndo_start_xmit = bam_dmux_netdev_start_xmit, +}; + +static const struct device_type wwan_type = { + .name = "wwan", +}; + +static void bam_dmux_netdev_setup(struct net_device *dev) +{ + dev->netdev_ops = &bam_dmux_ops; + + dev->type = ARPHRD_RAWIP; + SET_NETDEV_DEVTYPE(dev, &wwan_type); + dev->flags = IFF_POINTOPOINT | IFF_NOARP; + + dev->mtu = ETH_DATA_LEN; + dev->max_mtu = BAM_DMUX_MAX_DATA_SIZE; + dev->needed_headroom = sizeof(struct bam_dmux_hdr); + dev->needed_tailroom = sizeof(u32); /* word-aligned */ + dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; + + /* This perm addr will be used as interface identifier by IPv6 */ + dev->addr_assign_type = NET_ADDR_RANDOM; + eth_random_addr(dev->perm_addr); +} + +static void bam_dmux_register_netdev_work(struct work_struct *work) +{ + struct bam_dmux *dmux = container_of(work, struct bam_dmux, register_netdev_work); + struct bam_dmux_netdev *bndev; + struct net_device *netdev; + int ch, ret; + + for_each_set_bit(ch, dmux->remote_channels, BAM_DMUX_NUM_CH) { + if (dmux->netdevs[ch]) + continue; + + netdev = alloc_netdev(sizeof(*bndev), "wwan%d", NET_NAME_ENUM, + bam_dmux_netdev_setup); + if (!netdev) + return; + + SET_NETDEV_DEV(netdev, dmux->dev); + netdev->dev_port = ch; + + bndev = netdev_priv(netdev); + bndev->dmux = dmux; + bndev->ch = ch; + + ret = register_netdev(netdev); + if (ret) { + dev_err(dmux->dev, "Failed to register netdev for channel %u: %d\n", + ch, ret); + free_netdev(netdev); + return; + } + + dmux->netdevs[ch] = netdev; + } +} + +static void bam_dmux_rx_callback(void *data); + +static bool bam_dmux_skb_dma_submit_rx(struct bam_dmux_skb_dma *skb_dma) +{ + struct bam_dmux *dmux = skb_dma->dmux; + struct dma_async_tx_descriptor *desc; + + desc = dmaengine_prep_slave_single(dmux->rx, skb_dma->addr, + skb_dma->skb->len, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT); + if (!desc) { + dev_err(dmux->dev, "Failed to prepare RX DMA buffer\n"); + return false; + } + + desc->callback = bam_dmux_rx_callback; + desc->callback_param = skb_dma; + desc->cookie = dmaengine_submit(desc); + return true; +} + +static bool bam_dmux_skb_dma_queue_rx(struct bam_dmux_skb_dma *skb_dma, gfp_t gfp) +{ + if (!skb_dma->skb) { + skb_dma->skb = __netdev_alloc_skb(NULL, BAM_DMUX_BUFFER_SIZE, gfp); + if (!skb_dma->skb) + return false; + skb_put(skb_dma->skb, BAM_DMUX_BUFFER_SIZE); + } + + return bam_dmux_skb_dma_map(skb_dma, DMA_FROM_DEVICE) && + bam_dmux_skb_dma_submit_rx(skb_dma); +} + +static void bam_dmux_cmd_data(struct bam_dmux_skb_dma *skb_dma) +{ + struct bam_dmux *dmux = skb_dma->dmux; + struct sk_buff *skb = skb_dma->skb; + struct bam_dmux_hdr *hdr = (struct bam_dmux_hdr *)skb->data; + struct net_device *netdev = dmux->netdevs[hdr->ch]; + + if (!netdev || !netif_running(netdev)) { + dev_warn(dmux->dev, "Data for inactive channel %u\n", hdr->ch); + return; + } + + if (hdr->len > BAM_DMUX_MAX_DATA_SIZE) { + dev_err(dmux->dev, "Data larger than buffer? (%u > %u)\n", + hdr->len, (u16)BAM_DMUX_MAX_DATA_SIZE); + return; + } + + skb_dma->skb = NULL; /* Hand over to network stack */ + + skb_pull(skb, sizeof(*hdr)); + skb_trim(skb, hdr->len); + skb->dev = netdev; + + /* Only Raw-IP/QMAP is supported by this driver */ + switch (skb->data[0] & 0xf0) { + case 0x40: + skb->protocol = htons(ETH_P_IP); + break; + case 0x60: + skb->protocol = htons(ETH_P_IPV6); + break; + default: + skb->protocol = htons(ETH_P_MAP); + break; + } + + netif_receive_skb(skb); +} + +static void bam_dmux_cmd_open(struct bam_dmux *dmux, struct bam_dmux_hdr *hdr) +{ + struct net_device *netdev = dmux->netdevs[hdr->ch]; + + dev_dbg(dmux->dev, "open channel: %u\n", hdr->ch); + + if (__test_and_set_bit(hdr->ch, dmux->remote_channels)) { + dev_warn(dmux->dev, "Channel already open: %u\n", hdr->ch); + return; + } + + if (netdev) { + netif_device_attach(netdev); + } else { + /* Cannot sleep here, schedule work to register the netdev */ + schedule_work(&dmux->register_netdev_work); + } +} + +static void bam_dmux_cmd_close(struct bam_dmux *dmux, struct bam_dmux_hdr *hdr) +{ + struct net_device *netdev = dmux->netdevs[hdr->ch]; + + dev_dbg(dmux->dev, "close channel: %u\n", hdr->ch); + + if (!__test_and_clear_bit(hdr->ch, dmux->remote_channels)) { + dev_err(dmux->dev, "Channel not open: %u\n", hdr->ch); + return; + } + + if (netdev) + netif_device_detach(netdev); +} + +static void bam_dmux_rx_callback(void *data) +{ + struct bam_dmux_skb_dma *skb_dma = data; + struct bam_dmux *dmux = skb_dma->dmux; + struct sk_buff *skb = skb_dma->skb; + struct bam_dmux_hdr *hdr = (struct bam_dmux_hdr *)skb->data; + + bam_dmux_skb_dma_unmap(skb_dma, DMA_FROM_DEVICE); + + if (hdr->magic != BAM_DMUX_HDR_MAGIC) { + dev_err(dmux->dev, "Invalid magic in header: %#x\n", hdr->magic); + goto out; + } + + if (hdr->ch >= BAM_DMUX_NUM_CH) { + dev_dbg(dmux->dev, "Unsupported channel: %u\n", hdr->ch); + goto out; + } + + switch (hdr->cmd) { + case BAM_DMUX_CMD_DATA: + bam_dmux_cmd_data(skb_dma); + break; + case BAM_DMUX_CMD_OPEN: + bam_dmux_cmd_open(dmux, hdr); + break; + case BAM_DMUX_CMD_CLOSE: + bam_dmux_cmd_close(dmux, hdr); + break; + default: + dev_err(dmux->dev, "Unsupported command %u on channel %u\n", + hdr->cmd, hdr->ch); + break; + } + +out: + if (bam_dmux_skb_dma_queue_rx(skb_dma, GFP_ATOMIC)) + dma_async_issue_pending(dmux->rx); +} + +static bool bam_dmux_power_on(struct bam_dmux *dmux) +{ + struct device *dev = dmux->dev; + struct dma_slave_config dma_rx_conf = { + .direction = DMA_DEV_TO_MEM, + .src_maxburst = BAM_DMUX_BUFFER_SIZE, + }; + int i; + + dmux->rx = dma_request_chan(dev, "rx"); + if (IS_ERR(dmux->rx)) { + dev_err(dev, "Failed to request RX DMA channel: %pe\n", dmux->rx); + dmux->rx = NULL; + return false; + } + dmaengine_slave_config(dmux->rx, &dma_rx_conf); + + for (i = 0; i < BAM_DMUX_NUM_SKB; i++) { + if (!bam_dmux_skb_dma_queue_rx(&dmux->rx_skbs[i], GFP_KERNEL)) + return false; + } + dma_async_issue_pending(dmux->rx); + + return true; +} + +static void bam_dmux_free_skbs(struct bam_dmux_skb_dma skbs[], + enum dma_data_direction dir) +{ + int i; + + for (i = 0; i < BAM_DMUX_NUM_SKB; i++) { + struct bam_dmux_skb_dma *skb_dma = &skbs[i]; + + if (skb_dma->addr) + bam_dmux_skb_dma_unmap(skb_dma, dir); + if (skb_dma->skb) { + dev_kfree_skb(skb_dma->skb); + skb_dma->skb = NULL; + } + } +} + +static void bam_dmux_power_off(struct bam_dmux *dmux) +{ + if (dmux->tx) { + dmaengine_terminate_sync(dmux->tx); + dma_release_channel(dmux->tx); + dmux->tx = NULL; + } + + if (dmux->rx) { + dmaengine_terminate_sync(dmux->rx); + dma_release_channel(dmux->rx); + dmux->rx = NULL; + } + + bam_dmux_free_skbs(dmux->rx_skbs, DMA_FROM_DEVICE); +} + +static irqreturn_t bam_dmux_pc_irq(int irq, void *data) +{ + struct bam_dmux *dmux = data; + bool new_state = !dmux->pc_state; + + dev_dbg(dmux->dev, "pc: %u\n", new_state); + + if (new_state) { + if (bam_dmux_power_on(dmux)) + bam_dmux_pc_ack(dmux); + else + bam_dmux_power_off(dmux); + } else { + bam_dmux_power_off(dmux); + bam_dmux_pc_ack(dmux); + } + + dmux->pc_state = new_state; + wake_up_all(&dmux->pc_wait); + + return IRQ_HANDLED; +} + +static irqreturn_t bam_dmux_pc_ack_irq(int irq, void *data) +{ + struct bam_dmux *dmux = data; + + dev_dbg(dmux->dev, "pc ack\n"); + complete_all(&dmux->pc_ack_completion); + + return IRQ_HANDLED; +} + +static int bam_dmux_runtime_suspend(struct device *dev) +{ + struct bam_dmux *dmux = dev_get_drvdata(dev); + + dev_dbg(dev, "runtime suspend\n"); + bam_dmux_pc_vote(dmux, false); + + return 0; +} + +static int __maybe_unused bam_dmux_runtime_resume(struct device *dev) +{ + struct bam_dmux *dmux = dev_get_drvdata(dev); + + dev_dbg(dev, "runtime resume\n"); + + /* Wait until previous power down was acked */ + if (!wait_for_completion_timeout(&dmux->pc_ack_completion, + BAM_DMUX_REMOTE_TIMEOUT)) + return -ETIMEDOUT; + + /* Vote for power state */ + bam_dmux_pc_vote(dmux, true); + + /* Wait for ack */ + if (!wait_for_completion_timeout(&dmux->pc_ack_completion, + BAM_DMUX_REMOTE_TIMEOUT)) { + bam_dmux_pc_vote(dmux, false); + return -ETIMEDOUT; + } + + /* Wait until we're up */ + if (!wait_event_timeout(dmux->pc_wait, dmux->pc_state, + BAM_DMUX_REMOTE_TIMEOUT)) { + bam_dmux_pc_vote(dmux, false); + return -ETIMEDOUT; + } + + /* Ensure that we actually initialized successfully */ + if (!dmux->rx) { + bam_dmux_pc_vote(dmux, false); + return -ENXIO; + } + + /* Request TX channel if necessary */ + if (dmux->tx) + return 0; + + dmux->tx = dma_request_chan(dev, "tx"); + if (IS_ERR(dmux->rx)) { + dev_err(dev, "Failed to request TX DMA channel: %pe\n", dmux->tx); + dmux->tx = NULL; + bam_dmux_runtime_suspend(dev); + return -ENXIO; + } + + return 0; +} + +static int bam_dmux_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct bam_dmux *dmux; + int ret, pc_ack_irq, i; + unsigned int bit; + + dmux = devm_kzalloc(dev, sizeof(*dmux), GFP_KERNEL); + if (!dmux) + return -ENOMEM; + + dmux->dev = dev; + platform_set_drvdata(pdev, dmux); + + dmux->pc_irq = platform_get_irq_byname(pdev, "pc"); + if (dmux->pc_irq < 0) + return dmux->pc_irq; + + pc_ack_irq = platform_get_irq_byname(pdev, "pc-ack"); + if (pc_ack_irq < 0) + return pc_ack_irq; + + dmux->pc = devm_qcom_smem_state_get(dev, "pc", &bit); + if (IS_ERR(dmux->pc)) + return dev_err_probe(dev, PTR_ERR(dmux->pc), + "Failed to get pc state\n"); + dmux->pc_mask = BIT(bit); + + dmux->pc_ack = devm_qcom_smem_state_get(dev, "pc-ack", &bit); + if (IS_ERR(dmux->pc_ack)) + return dev_err_probe(dev, PTR_ERR(dmux->pc_ack), + "Failed to get pc-ack state\n"); + dmux->pc_ack_mask = BIT(bit); + + init_waitqueue_head(&dmux->pc_wait); + init_completion(&dmux->pc_ack_completion); + complete_all(&dmux->pc_ack_completion); + + spin_lock_init(&dmux->tx_lock); + INIT_WORK(&dmux->tx_wakeup_work, bam_dmux_tx_wakeup_work); + INIT_WORK(&dmux->register_netdev_work, bam_dmux_register_netdev_work); + + for (i = 0; i < BAM_DMUX_NUM_SKB; i++) { + dmux->rx_skbs[i].dmux = dmux; + dmux->tx_skbs[i].dmux = dmux; + } + + /* Runtime PM manages our own power vote. + * Note that the RX path may be active even if we are runtime suspended, + * since it is controlled by the remote side. + */ + pm_runtime_set_autosuspend_delay(dev, BAM_DMUX_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(dev); + pm_runtime_enable(dev); + + ret = devm_request_threaded_irq(dev, pc_ack_irq, NULL, bam_dmux_pc_ack_irq, + IRQF_ONESHOT, NULL, dmux); + if (ret) + return ret; + + ret = devm_request_threaded_irq(dev, dmux->pc_irq, NULL, bam_dmux_pc_irq, + IRQF_ONESHOT, NULL, dmux); + if (ret) + return ret; + + ret = irq_get_irqchip_state(dmux->pc_irq, IRQCHIP_STATE_LINE_LEVEL, + &dmux->pc_state); + if (ret) + return ret; + + /* Check if remote finished initialization before us */ + if (dmux->pc_state) { + if (bam_dmux_power_on(dmux)) + bam_dmux_pc_ack(dmux); + else + bam_dmux_power_off(dmux); + } + + return 0; +} + +static int bam_dmux_remove(struct platform_device *pdev) +{ + struct bam_dmux *dmux = platform_get_drvdata(pdev); + struct device *dev = dmux->dev; + LIST_HEAD(list); + int i; + + /* Unregister network interfaces */ + cancel_work_sync(&dmux->register_netdev_work); + rtnl_lock(); + for (i = 0; i < BAM_DMUX_NUM_CH; ++i) + if (dmux->netdevs[i]) + unregister_netdevice_queue(dmux->netdevs[i], &list); + unregister_netdevice_many(&list); + rtnl_unlock(); + cancel_work_sync(&dmux->tx_wakeup_work); + + /* Drop our own power vote */ + pm_runtime_disable(dev); + pm_runtime_dont_use_autosuspend(dev); + bam_dmux_runtime_suspend(dev); + pm_runtime_set_suspended(dev); + + /* Try to wait for remote side to drop power vote */ + if (!wait_event_timeout(dmux->pc_wait, !dmux->rx, BAM_DMUX_REMOTE_TIMEOUT)) + dev_err(dev, "Timed out waiting for remote side to suspend\n"); + + /* Make sure everything is cleaned up before we return */ + disable_irq(dmux->pc_irq); + bam_dmux_power_off(dmux); + bam_dmux_free_skbs(dmux->tx_skbs, DMA_TO_DEVICE); + + return 0; +} + +static const struct dev_pm_ops bam_dmux_pm_ops = { + SET_RUNTIME_PM_OPS(bam_dmux_runtime_suspend, bam_dmux_runtime_resume, NULL) +}; + +static const struct of_device_id bam_dmux_of_match[] = { + { .compatible = "qcom,bam-dmux" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, bam_dmux_of_match); + +static struct platform_driver bam_dmux_driver = { + .probe = bam_dmux_probe, + .remove = bam_dmux_remove, + .driver = { + .name = "bam-dmux", + .pm = &bam_dmux_pm_ops, + .of_match_table = bam_dmux_of_match, + }, +}; +module_platform_driver(bam_dmux_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Qualcomm BAM-DMUX WWAN Network Driver"); +MODULE_AUTHOR("Stephan Gerhold <stephan@gerhold.net>"); diff --git a/drivers/net/wwan/wwan_core.c b/drivers/net/wwan/wwan_core.c index d293ab688044..1508dc2a497b 100644 --- a/drivers/net/wwan/wwan_core.c +++ b/drivers/net/wwan/wwan_core.c @@ -3,6 +3,7 @@ #include <linux/err.h> #include <linux/errno.h> +#include <linux/debugfs.h> #include <linux/fs.h> #include <linux/init.h> #include <linux/idr.h> @@ -25,6 +26,7 @@ static DEFINE_IDA(minors); /* minors for WWAN port chardevs */ static DEFINE_IDA(wwan_dev_ids); /* for unique WWAN device IDs */ static struct class *wwan_class; static int wwan_major; +static struct dentry *wwan_debugfs_dir; #define to_wwan_dev(d) container_of(d, struct wwan_device, dev) #define to_wwan_port(d) container_of(d, struct wwan_port, dev) @@ -40,6 +42,7 @@ static int wwan_major; * @port_id: Current available port ID to pick. * @ops: wwan device ops * @ops_ctxt: context to pass to ops + * @debugfs_dir: WWAN device debugfs dir */ struct wwan_device { unsigned int id; @@ -47,6 +50,9 @@ struct wwan_device { atomic_t port_id; const struct wwan_ops *ops; void *ops_ctxt; +#ifdef CONFIG_WWAN_DEBUGFS + struct dentry *debugfs_dir; +#endif }; /** @@ -142,6 +148,20 @@ static struct wwan_device *wwan_dev_get_by_name(const char *name) return to_wwan_dev(dev); } +#ifdef CONFIG_WWAN_DEBUGFS +struct dentry *wwan_get_debugfs_dir(struct device *parent) +{ + struct wwan_device *wwandev; + + wwandev = wwan_dev_get_by_parent(parent); + if (IS_ERR(wwandev)) + return ERR_CAST(wwandev); + + return wwandev->debugfs_dir; +} +EXPORT_SYMBOL_GPL(wwan_get_debugfs_dir); +#endif + /* This function allocates and registers a new WWAN device OR if a WWAN device * already exist for the given parent, it gets a reference and return it. * This function is not exported (for now), it is called indirectly via @@ -189,6 +209,12 @@ static struct wwan_device *wwan_create_dev(struct device *parent) goto done_unlock; } +#ifdef CONFIG_WWAN_DEBUGFS + wwandev->debugfs_dir = + debugfs_create_dir(kobject_name(&wwandev->dev.kobj), + wwan_debugfs_dir); +#endif + done_unlock: mutex_unlock(&wwan_register_lock); @@ -218,10 +244,14 @@ static void wwan_remove_dev(struct wwan_device *wwandev) else ret = device_for_each_child(&wwandev->dev, NULL, is_wwan_child); - if (!ret) + if (!ret) { +#ifdef CONFIG_WWAN_DEBUGFS + debugfs_remove_recursive(wwandev->debugfs_dir); +#endif device_unregister(&wwandev->dev); - else + } else { put_device(&wwandev->dev); + } mutex_unlock(&wwan_register_lock); } @@ -1117,6 +1147,10 @@ static int __init wwan_init(void) goto destroy; } +#ifdef CONFIG_WWAN_DEBUGFS + wwan_debugfs_dir = debugfs_create_dir("wwan", NULL); +#endif + return 0; destroy: @@ -1128,6 +1162,7 @@ unregister: static void __exit wwan_exit(void) { + debugfs_remove_recursive(wwan_debugfs_dir); __unregister_chrdev(wwan_major, 0, WWAN_MAX_MINORS, "wwan_port"); rtnl_link_unregister(&wwan_rtnl_link_ops); class_destroy(wwan_class); |