| /* |
| * Copyright (c) 2015-2019 The Linux Foundation. All rights reserved. |
| * |
| * Permission to use, copy, modify, and/or distribute this software for |
| * any purpose with or without fee is hereby granted, provided that the |
| * above copyright notice and this permission notice appear in all |
| * copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL |
| * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE |
| * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| * PERFORMANCE OF THIS SOFTWARE. |
| */ |
| |
| #include <linux/pci.h> |
| #include <linux/slab.h> |
| #include <linux/interrupt.h> |
| #include <linux/if_arp.h> |
| #include "qdf_lock.h" |
| #include "qdf_types.h" |
| #include "qdf_status.h" |
| #include "regtable.h" |
| #include "hif.h" |
| #include "hif_io32.h" |
| #include "ce_main.h" |
| #include "ce_api.h" |
| #include "ce_reg.h" |
| #include "ce_internal.h" |
| #include "ce_tasklet.h" |
| #include "pld_common.h" |
| #include "hif_debug.h" |
| #include "hif_napi.h" |
| |
| |
| /** |
| * struct tasklet_work |
| * |
| * @id: ce_id |
| * @work: work |
| */ |
| struct tasklet_work { |
| enum ce_id_type id; |
| void *data; |
| struct work_struct work; |
| }; |
| |
| |
| /** |
| * reschedule_ce_tasklet_work_handler() - reschedule work |
| * @work: struct work_struct |
| * |
| * Return: N/A |
| */ |
| static void reschedule_ce_tasklet_work_handler(struct work_struct *work) |
| { |
| struct tasklet_work *ce_work = container_of(work, struct tasklet_work, |
| work); |
| struct hif_softc *scn = ce_work->data; |
| struct HIF_CE_state *hif_ce_state; |
| |
| if (!scn) { |
| HIF_ERROR("%s: tasklet scn is null", __func__); |
| return; |
| } |
| |
| hif_ce_state = HIF_GET_CE_STATE(scn); |
| |
| if (scn->hif_init_done == false) { |
| HIF_ERROR("%s: wlan driver is unloaded", __func__); |
| return; |
| } |
| if (hif_ce_state->tasklets[ce_work->id].inited) |
| tasklet_schedule(&hif_ce_state->tasklets[ce_work->id].intr_tq); |
| } |
| |
| static struct tasklet_work tasklet_workers[CE_ID_MAX]; |
| static bool work_initialized; |
| |
| /** |
| * init_tasklet_work() - init_tasklet_work |
| * @work: struct work_struct |
| * @work_handler: work_handler |
| * |
| * Return: N/A |
| */ |
| static void init_tasklet_work(struct work_struct *work, |
| work_func_t work_handler) |
| { |
| INIT_WORK(work, work_handler); |
| } |
| |
| /** |
| * init_tasklet_workers() - init_tasklet_workers |
| * @scn: HIF Context |
| * |
| * Return: N/A |
| */ |
| void init_tasklet_workers(struct hif_opaque_softc *scn) |
| { |
| uint32_t id; |
| |
| for (id = 0; id < CE_ID_MAX; id++) { |
| tasklet_workers[id].id = id; |
| tasklet_workers[id].data = scn; |
| init_tasklet_work(&tasklet_workers[id].work, |
| reschedule_ce_tasklet_work_handler); |
| } |
| work_initialized = true; |
| } |
| |
| /** |
| * deinit_tasklet_workers() - deinit_tasklet_workers |
| * @scn: HIF Context |
| * |
| * Return: N/A |
| */ |
| void deinit_tasklet_workers(struct hif_opaque_softc *scn) |
| { |
| u32 id; |
| |
| for (id = 0; id < CE_ID_MAX; id++) |
| cancel_work_sync(&tasklet_workers[id].work); |
| |
| work_initialized = false; |
| } |
| |
| /** |
| * ce_schedule_tasklet() - schedule ce tasklet |
| * @tasklet_entry: struct ce_tasklet_entry |
| * |
| * Return: N/A |
| */ |
| static inline void ce_schedule_tasklet(struct ce_tasklet_entry *tasklet_entry) |
| { |
| tasklet_schedule(&tasklet_entry->intr_tq); |
| } |
| |
| /** |
| * ce_tasklet() - ce_tasklet |
| * @data: data |
| * |
| * Return: N/A |
| */ |
| static void ce_tasklet(unsigned long data) |
| { |
| struct ce_tasklet_entry *tasklet_entry = |
| (struct ce_tasklet_entry *)data; |
| struct HIF_CE_state *hif_ce_state = tasklet_entry->hif_ce_state; |
| struct hif_softc *scn = HIF_GET_SOFTC(hif_ce_state); |
| struct CE_state *CE_state = scn->ce_id_to_state[tasklet_entry->ce_id]; |
| |
| hif_record_ce_desc_event(scn, tasklet_entry->ce_id, |
| HIF_CE_TASKLET_ENTRY, NULL, NULL, 0, 0); |
| |
| if (qdf_atomic_read(&scn->link_suspended)) { |
| HIF_ERROR("%s: ce %d tasklet fired after link suspend.", |
| __func__, tasklet_entry->ce_id); |
| QDF_BUG(0); |
| } |
| |
| ce_per_engine_service(scn, tasklet_entry->ce_id); |
| |
| if (ce_check_rx_pending(CE_state) && tasklet_entry->inited) { |
| /* |
| * There are frames pending, schedule tasklet to process them. |
| * Enable the interrupt only when there is no pending frames in |
| * any of the Copy Engine pipes. |
| */ |
| hif_record_ce_desc_event(scn, tasklet_entry->ce_id, |
| HIF_CE_TASKLET_RESCHEDULE, NULL, NULL, 0, 0); |
| |
| ce_schedule_tasklet(tasklet_entry); |
| return; |
| } |
| |
| if (scn->target_status != TARGET_STATUS_RESET) |
| hif_irq_enable(scn, tasklet_entry->ce_id); |
| |
| hif_record_ce_desc_event(scn, tasklet_entry->ce_id, HIF_CE_TASKLET_EXIT, |
| NULL, NULL, 0, 0); |
| |
| qdf_atomic_dec(&scn->active_tasklet_cnt); |
| } |
| |
| /** |
| * ce_tasklet_init() - ce_tasklet_init |
| * @hif_ce_state: hif_ce_state |
| * @mask: mask |
| * |
| * Return: N/A |
| */ |
| void ce_tasklet_init(struct HIF_CE_state *hif_ce_state, uint32_t mask) |
| { |
| int i; |
| |
| for (i = 0; i < CE_COUNT_MAX; i++) { |
| if (mask & (1 << i)) { |
| hif_ce_state->tasklets[i].ce_id = i; |
| hif_ce_state->tasklets[i].inited = true; |
| hif_ce_state->tasklets[i].hif_ce_state = hif_ce_state; |
| tasklet_init(&hif_ce_state->tasklets[i].intr_tq, |
| ce_tasklet, |
| (unsigned long)&hif_ce_state->tasklets[i]); |
| } |
| } |
| } |
| /** |
| * ce_tasklet_kill() - ce_tasklet_kill |
| * @hif_ce_state: hif_ce_state |
| * |
| * Context: Non-Atomic context |
| * Return: N/A |
| */ |
| void ce_tasklet_kill(struct hif_softc *scn) |
| { |
| int i; |
| struct HIF_CE_state *hif_ce_state = HIF_GET_CE_STATE(scn); |
| |
| work_initialized = false; |
| |
| for (i = 0; i < CE_COUNT_MAX; i++) { |
| if (hif_ce_state->tasklets[i].inited) { |
| hif_ce_state->tasklets[i].inited = false; |
| /* |
| * Cancel the tasklet work before tasklet_disable |
| * to avoid race between tasklet_schedule and |
| * tasklet_kill. Here cancel_work_sync() won't |
| * return before reschedule_ce_tasklet_work_handler() |
| * completes. Even if tasklet_schedule() happens |
| * tasklet_disable() will take care of that. |
| */ |
| cancel_work_sync(&tasklet_workers[i].work); |
| tasklet_kill(&hif_ce_state->tasklets[i].intr_tq); |
| } |
| } |
| qdf_atomic_set(&scn->active_tasklet_cnt, 0); |
| } |
| |
| #define HIF_CE_DRAIN_WAIT_CNT 20 |
| /** |
| * hif_drain_tasklets(): wait until no tasklet is pending |
| * @scn: hif context |
| * |
| * Let running tasklets clear pending trafic. |
| * |
| * Return: 0 if no bottom half is in progress when it returns. |
| * -EFAULT if it times out. |
| */ |
| int hif_drain_tasklets(struct hif_softc *scn) |
| { |
| uint32_t ce_drain_wait_cnt = 0; |
| int32_t tasklet_cnt; |
| |
| while ((tasklet_cnt = qdf_atomic_read(&scn->active_tasklet_cnt))) { |
| if (++ce_drain_wait_cnt > HIF_CE_DRAIN_WAIT_CNT) { |
| HIF_ERROR("%s: CE still not done with access: %d", |
| __func__, tasklet_cnt); |
| |
| return -EFAULT; |
| } |
| HIF_INFO("%s: Waiting for CE to finish access", __func__); |
| msleep(10); |
| } |
| return 0; |
| } |
| |
| #ifdef WLAN_SUSPEND_RESUME_TEST |
| /** |
| * hif_interrupt_is_ut_resume(): Tests if an irq on the given copy engine should |
| * trigger a unit-test resume. |
| * @scn: The HIF context to operate on |
| * @ce_id: The copy engine Id from the originating interrupt |
| * |
| * Return: true if the raised irq should trigger a unit-test resume |
| */ |
| static bool hif_interrupt_is_ut_resume(struct hif_softc *scn, int ce_id) |
| { |
| int errno; |
| uint8_t wake_ce_id; |
| |
| if (!hif_is_ut_suspended(scn)) |
| return false; |
| |
| /* ensure passed ce_id matches wake ce_id */ |
| errno = hif_get_wake_ce_id(scn, &wake_ce_id); |
| if (errno) { |
| HIF_ERROR("%s: failed to get wake CE Id: %d", __func__, errno); |
| return false; |
| } |
| |
| return ce_id == wake_ce_id; |
| } |
| #else |
| static inline bool |
| hif_interrupt_is_ut_resume(struct hif_softc *scn, int ce_id) |
| { |
| return false; |
| } |
| #endif /* WLAN_SUSPEND_RESUME_TEST */ |
| |
| /** |
| * hif_snoc_interrupt_handler() - hif_snoc_interrupt_handler |
| * @irq: irq coming from kernel |
| * @context: context |
| * |
| * Return: N/A |
| */ |
| static irqreturn_t hif_snoc_interrupt_handler(int irq, void *context) |
| { |
| struct ce_tasklet_entry *tasklet_entry = context; |
| struct hif_softc *scn = HIF_GET_SOFTC(tasklet_entry->hif_ce_state); |
| |
| return ce_dispatch_interrupt(pld_get_ce_id(scn->qdf_dev->dev, irq), |
| tasklet_entry); |
| } |
| |
| /** |
| * hif_ce_increment_interrupt_count() - update ce stats |
| * @hif_ce_state: ce state |
| * @ce_id: ce id |
| * |
| * Return: none |
| */ |
| static inline void |
| hif_ce_increment_interrupt_count(struct HIF_CE_state *hif_ce_state, int ce_id) |
| { |
| int cpu_id = qdf_get_cpu(); |
| |
| hif_ce_state->stats.ce_per_cpu[ce_id][cpu_id]++; |
| } |
| |
| /** |
| * hif_display_ce_stats() - display ce stats |
| * @hif_ce_state: ce state |
| * |
| * Return: none |
| */ |
| void hif_display_ce_stats(struct HIF_CE_state *hif_ce_state) |
| { |
| #define STR_SIZE 128 |
| uint8_t i, j, pos; |
| char str_buffer[STR_SIZE]; |
| int size, ret; |
| |
| qdf_debug("CE interrupt statistics:"); |
| for (i = 0; i < CE_COUNT_MAX; i++) { |
| size = STR_SIZE; |
| pos = 0; |
| for (j = 0; j < QDF_MAX_AVAILABLE_CPU; j++) { |
| ret = snprintf(str_buffer + pos, size, "[%d]:%d ", |
| j, hif_ce_state->stats.ce_per_cpu[i][j]); |
| if (ret <= 0 || ret >= size) |
| break; |
| size -= ret; |
| pos += ret; |
| } |
| qdf_debug("CE id[%2d] - %s", i, str_buffer); |
| } |
| #undef STR_SIZE |
| } |
| |
| /** |
| * hif_clear_ce_stats() - clear ce stats |
| * @hif_ce_state: ce state |
| * |
| * Return: none |
| */ |
| void hif_clear_ce_stats(struct HIF_CE_state *hif_ce_state) |
| { |
| qdf_mem_zero(&hif_ce_state->stats, sizeof(struct ce_stats)); |
| } |
| |
| /** |
| * hif_tasklet_schedule() - schedule tasklet |
| * @hif_ctx: hif context |
| * @tasklet_entry: ce tasklet entry |
| * |
| * Return: false if tasklet already scheduled, otherwise true |
| */ |
| static inline bool hif_tasklet_schedule(struct hif_opaque_softc *hif_ctx, |
| struct ce_tasklet_entry *tasklet_entry) |
| { |
| struct hif_softc *scn = HIF_GET_SOFTC(hif_ctx); |
| |
| if (test_bit(TASKLET_STATE_SCHED, &tasklet_entry->intr_tq.state)) { |
| HIF_DBG("tasklet scheduled, return"); |
| qdf_atomic_dec(&scn->active_tasklet_cnt); |
| return false; |
| } |
| |
| tasklet_schedule(&tasklet_entry->intr_tq); |
| return true; |
| } |
| |
| /** |
| * ce_dispatch_interrupt() - dispatch an interrupt to a processing context |
| * @ce_id: ce_id |
| * @tasklet_entry: context |
| * |
| * Return: N/A |
| */ |
| irqreturn_t ce_dispatch_interrupt(int ce_id, |
| struct ce_tasklet_entry *tasklet_entry) |
| { |
| struct HIF_CE_state *hif_ce_state = tasklet_entry->hif_ce_state; |
| struct hif_softc *scn = HIF_GET_SOFTC(hif_ce_state); |
| struct hif_opaque_softc *hif_hdl = GET_HIF_OPAQUE_HDL(scn); |
| |
| if (tasklet_entry->ce_id != ce_id) { |
| HIF_ERROR("%s: ce_id (expect %d, received %d) does not match", |
| __func__, tasklet_entry->ce_id, ce_id); |
| return IRQ_NONE; |
| } |
| if (unlikely(ce_id >= CE_COUNT_MAX)) { |
| HIF_ERROR("%s: ce_id=%d > CE_COUNT_MAX=%d", |
| __func__, tasklet_entry->ce_id, CE_COUNT_MAX); |
| return IRQ_NONE; |
| } |
| |
| hif_irq_disable(scn, ce_id); |
| |
| if (!TARGET_REGISTER_ACCESS_ALLOWED(scn)) |
| return IRQ_HANDLED; |
| |
| hif_record_ce_desc_event(scn, ce_id, HIF_IRQ_EVENT, |
| NULL, NULL, 0, 0); |
| hif_ce_increment_interrupt_count(hif_ce_state, ce_id); |
| |
| if (unlikely(hif_interrupt_is_ut_resume(scn, ce_id))) { |
| hif_ut_fw_resume(scn); |
| hif_irq_enable(scn, ce_id); |
| return IRQ_HANDLED; |
| } |
| |
| qdf_atomic_inc(&scn->active_tasklet_cnt); |
| |
| if (hif_napi_enabled(hif_hdl, ce_id)) |
| hif_napi_schedule(hif_hdl, ce_id); |
| else |
| hif_tasklet_schedule(hif_hdl, tasklet_entry); |
| |
| return IRQ_HANDLED; |
| } |
| |
| /** |
| * const char *ce_name |
| * |
| * @ce_name: ce_name |
| */ |
| const char *ce_name[] = { |
| "WLAN_CE_0", |
| "WLAN_CE_1", |
| "WLAN_CE_2", |
| "WLAN_CE_3", |
| "WLAN_CE_4", |
| "WLAN_CE_5", |
| "WLAN_CE_6", |
| "WLAN_CE_7", |
| "WLAN_CE_8", |
| "WLAN_CE_9", |
| "WLAN_CE_10", |
| "WLAN_CE_11", |
| }; |
| /** |
| * ce_unregister_irq() - ce_unregister_irq |
| * @hif_ce_state: hif_ce_state copy engine device handle |
| * @mask: which coppy engines to unregister for. |
| * |
| * Unregisters copy engine irqs matching mask. If a 1 is set at bit x, |
| * unregister for copy engine x. |
| * |
| * Return: QDF_STATUS |
| */ |
| QDF_STATUS ce_unregister_irq(struct HIF_CE_state *hif_ce_state, uint32_t mask) |
| { |
| int id; |
| int ce_count; |
| int ret; |
| struct hif_softc *scn; |
| |
| if (!hif_ce_state) { |
| HIF_WARN("%s: hif_ce_state = NULL", __func__); |
| return QDF_STATUS_SUCCESS; |
| } |
| |
| scn = HIF_GET_SOFTC(hif_ce_state); |
| ce_count = scn->ce_count; |
| /* we are removing interrupts, so better stop NAPI */ |
| ret = hif_napi_event(GET_HIF_OPAQUE_HDL(scn), |
| NAPI_EVT_INT_STATE, (void *)0); |
| if (ret != 0) |
| HIF_ERROR("%s: napi_event INT_STATE returned %d", |
| __func__, ret); |
| /* this is not fatal, continue */ |
| |
| /* filter mask to free only for ce's with irq registered */ |
| mask &= hif_ce_state->ce_register_irq_done; |
| for (id = 0; id < ce_count; id++) { |
| if ((mask & (1 << id)) && hif_ce_state->tasklets[id].inited) { |
| ret = pld_ce_free_irq(scn->qdf_dev->dev, id, |
| &hif_ce_state->tasklets[id]); |
| if (ret < 0) |
| HIF_ERROR( |
| "%s: pld_unregister_irq error - ce_id = %d, ret = %d", |
| __func__, id, ret); |
| } |
| ce_disable_polling(scn->ce_id_to_state[id]); |
| } |
| hif_ce_state->ce_register_irq_done &= ~mask; |
| |
| return QDF_STATUS_SUCCESS; |
| } |
| /** |
| * ce_register_irq() - ce_register_irq |
| * @hif_ce_state: hif_ce_state |
| * @mask: which coppy engines to unregister for. |
| * |
| * Registers copy engine irqs matching mask. If a 1 is set at bit x, |
| * Register for copy engine x. |
| * |
| * Return: QDF_STATUS |
| */ |
| QDF_STATUS ce_register_irq(struct HIF_CE_state *hif_ce_state, uint32_t mask) |
| { |
| int id; |
| int ce_count; |
| int ret; |
| unsigned long irqflags = IRQF_TRIGGER_RISING; |
| uint32_t done_mask = 0; |
| struct hif_softc *scn = HIF_GET_SOFTC(hif_ce_state); |
| |
| ce_count = scn->ce_count; |
| |
| for (id = 0; id < ce_count; id++) { |
| if ((mask & (1 << id)) && hif_ce_state->tasklets[id].inited) { |
| ret = pld_ce_request_irq(scn->qdf_dev->dev, id, |
| hif_snoc_interrupt_handler, |
| irqflags, ce_name[id], |
| &hif_ce_state->tasklets[id]); |
| if (ret) { |
| HIF_ERROR( |
| "%s: cannot register CE %d irq handler, ret = %d", |
| __func__, id, ret); |
| ce_unregister_irq(hif_ce_state, done_mask); |
| return QDF_STATUS_E_FAULT; |
| } |
| done_mask |= 1 << id; |
| } |
| } |
| hif_ce_state->ce_register_irq_done |= done_mask; |
| |
| return QDF_STATUS_SUCCESS; |
| } |