accel/ivpu: Move recovery work to system_unbound_wq

[drm/drm-misc.git] / drivers / net / wireless / intel / iwlwifi / pcie / trans-gen2.c

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright (C) 2017 Intel Deutschland GmbH
 * Copyright (C) 2018-2024 Intel Corporation
 */
#include "iwl-trans.h"
#include "iwl-prph.h"
#include "iwl-context-info.h"
#include "iwl-context-info-gen3.h"
#include "internal.h"
#include "fw/dbg.h"

#define FW_RESET_TIMEOUT (HZ / 5)

/*
 * Start up NIC's basic functionality after it has been reset
 * (e.g. after platform boot, or shutdown via iwl_pcie_apm_stop())
 * NOTE:  This does not load uCode nor start the embedded processor
 */
int iwl_pcie_gen2_apm_init(struct iwl_trans *trans)
{
        int ret = 0;

        IWL_DEBUG_INFO(trans, "Init card's basic functions\n");

        /*
         * Use "set_bit" below rather than "write", to preserve any hardware
         * bits already set by default after reset.
         */

        /*
         * Disable L0s without affecting L1;
         * don't wait for ICH L0s (ICH bug W/A)
         */
        iwl_set_bit(trans, CSR_GIO_CHICKEN_BITS,
                    CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX);

        /* Set FH wait threshold to maximum (HW error during stress W/A) */
        iwl_set_bit(trans, CSR_DBG_HPET_MEM_REG, CSR_DBG_HPET_MEM_REG_VAL);

        /*
         * Enable HAP INTA (interrupt from management bus) to
         * wake device's PCI Express link L1a -> L0s
         */
        iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
                    CSR_HW_IF_CONFIG_REG_BIT_HAP_WAKE_L1A);

        iwl_pcie_apm_config(trans);

        ret = iwl_finish_nic_init(trans);
        if (ret)
                return ret;

        set_bit(STATUS_DEVICE_ENABLED, &trans->status);

        return 0;
}

static void iwl_pcie_gen2_apm_stop(struct iwl_trans *trans, bool op_mode_leave)
{
        IWL_DEBUG_INFO(trans, "Stop card, put in low power state\n");

        if (op_mode_leave) {
                if (!test_bit(STATUS_DEVICE_ENABLED, &trans->status))
                        iwl_pcie_gen2_apm_init(trans);

                /* inform ME that we are leaving */
                iwl_set_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG,
                            CSR_RESET_LINK_PWR_MGMT_DISABLED);
                iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
                            CSR_HW_IF_CONFIG_REG_PREPARE |
                            CSR_HW_IF_CONFIG_REG_ENABLE_PME);
                mdelay(1);
                iwl_clear_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG,
                              CSR_RESET_LINK_PWR_MGMT_DISABLED);
                mdelay(5);
        }

        clear_bit(STATUS_DEVICE_ENABLED, &trans->status);

        /* Stop device's DMA activity */
        iwl_pcie_apm_stop_master(trans);

        iwl_trans_sw_reset(trans, false);

        /*
         * Clear "initialization complete" bit to move adapter from
         * D0A* (powered-up Active) --> D0U* (Uninitialized) state.
         */
        if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_BZ)
                iwl_clear_bit(trans, CSR_GP_CNTRL,
                              CSR_GP_CNTRL_REG_FLAG_MAC_INIT);
        else
                iwl_clear_bit(trans, CSR_GP_CNTRL,
                              CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
}

static void iwl_trans_pcie_fw_reset_handshake(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        int ret;

        trans_pcie->fw_reset_state = FW_RESET_REQUESTED;

        if (trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_AX210)
                iwl_write_umac_prph(trans, UREG_NIC_SET_NMI_DRIVER,
                                    UREG_NIC_SET_NMI_DRIVER_RESET_HANDSHAKE);
        else if (trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_AX210)
                iwl_write_umac_prph(trans, UREG_DOORBELL_TO_ISR6,
                                    UREG_DOORBELL_TO_ISR6_RESET_HANDSHAKE);
        else
                iwl_write32(trans, CSR_DOORBELL_VECTOR,
                            UREG_DOORBELL_TO_ISR6_RESET_HANDSHAKE);

        /* wait 200ms */
        ret = wait_event_timeout(trans_pcie->fw_reset_waitq,
                                 trans_pcie->fw_reset_state != FW_RESET_REQUESTED,
                                 FW_RESET_TIMEOUT);
        if (!ret || trans_pcie->fw_reset_state == FW_RESET_ERROR) {
                u32 inta_hw = iwl_read32(trans, CSR_MSIX_HW_INT_CAUSES_AD);

                IWL_ERR(trans,
                        "timeout waiting for FW reset ACK (inta_hw=0x%x)\n",
                        inta_hw);

                if (!(inta_hw & MSIX_HW_INT_CAUSES_REG_RESET_DONE))
                        iwl_trans_fw_error(trans, true);
        }

        trans_pcie->fw_reset_state = FW_RESET_IDLE;
}

void _iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

        lockdep_assert_held(&trans_pcie->mutex);

        if (trans_pcie->is_down)
                return;

        if (trans->state >= IWL_TRANS_FW_STARTED)
                if (trans_pcie->fw_reset_handshake)
                        iwl_trans_pcie_fw_reset_handshake(trans);

        trans_pcie->is_down = true;

        /* tell the device to stop sending interrupts */
        iwl_disable_interrupts(trans);

        /* device going down, Stop using ICT table */
        iwl_pcie_disable_ict(trans);

        /*
         * If a HW restart happens during firmware loading,
         * then the firmware loading might call this function
         * and later it might be called again due to the
         * restart. So don't process again if the device is
         * already dead.
         */
        if (test_and_clear_bit(STATUS_DEVICE_ENABLED, &trans->status)) {
                IWL_DEBUG_INFO(trans,
                               "DEVICE_ENABLED bit was set and is now cleared\n");
                iwl_pcie_synchronize_irqs(trans);
                iwl_pcie_rx_napi_sync(trans);
                iwl_txq_gen2_tx_free(trans);
                iwl_pcie_rx_stop(trans);
        }

        iwl_pcie_ctxt_info_free_paging(trans);
        if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_AX210)
                iwl_pcie_ctxt_info_gen3_free(trans, false);
        else
                iwl_pcie_ctxt_info_free(trans);

        /* Stop the device, and put it in low power state */
        iwl_pcie_gen2_apm_stop(trans, false);

        /* re-take ownership to prevent other users from stealing the device */
        iwl_trans_sw_reset(trans, true);

        /*
         * Upon stop, the IVAR table gets erased, so msi-x won't
         * work. This causes a bug in RF-KILL flows, since the interrupt
         * that enables radio won't fire on the correct irq, and the
         * driver won't be able to handle the interrupt.
         * Configure the IVAR table again after reset.
         */
        iwl_pcie_conf_msix_hw(trans_pcie);

        /*
         * Upon stop, the APM issues an interrupt if HW RF kill is set.
         * This is a bug in certain verions of the hardware.
         * Certain devices also keep sending HW RF kill interrupt all
         * the time, unless the interrupt is ACKed even if the interrupt
         * should be masked. Re-ACK all the interrupts here.
         */
        iwl_disable_interrupts(trans);

        /* clear all status bits */
        clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
        clear_bit(STATUS_INT_ENABLED, &trans->status);
        clear_bit(STATUS_TPOWER_PMI, &trans->status);

        /*
         * Even if we stop the HW, we still want the RF kill
         * interrupt
         */
        iwl_enable_rfkill_int(trans);
}

void iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        bool was_in_rfkill;

        iwl_op_mode_time_point(trans->op_mode,
                               IWL_FW_INI_TIME_POINT_HOST_DEVICE_DISABLE,
                               NULL);

        mutex_lock(&trans_pcie->mutex);
        trans_pcie->opmode_down = true;
        was_in_rfkill = test_bit(STATUS_RFKILL_OPMODE, &trans->status);
        _iwl_trans_pcie_gen2_stop_device(trans);
        iwl_trans_pcie_handle_stop_rfkill(trans, was_in_rfkill);
        mutex_unlock(&trans_pcie->mutex);
}

static int iwl_pcie_gen2_nic_init(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        int queue_size = max_t(u32, IWL_CMD_QUEUE_SIZE,
                               trans->cfg->min_txq_size);
        int ret;

        /* TODO: most of the logic can be removed in A0 - but not in Z0 */
        spin_lock_bh(&trans_pcie->irq_lock);
        ret = iwl_pcie_gen2_apm_init(trans);
        spin_unlock_bh(&trans_pcie->irq_lock);
        if (ret)
                return ret;

        iwl_op_mode_nic_config(trans->op_mode);

        /* Allocate the RX queue, or reset if it is already allocated */
        if (iwl_pcie_gen2_rx_init(trans))
                return -ENOMEM;

        /* Allocate or reset and init all Tx and Command queues */
        if (iwl_txq_gen2_init(trans, trans_pcie->txqs.cmd.q_id, queue_size))
                return -ENOMEM;

        /* enable shadow regs in HW */
        iwl_set_bit(trans, CSR_MAC_SHADOW_REG_CTRL, 0x800FFFFF);
        IWL_DEBUG_INFO(trans, "Enabling shadow registers in device\n");

        return 0;
}

static void iwl_pcie_get_rf_name(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        char *buf = trans_pcie->rf_name;
        size_t buflen = sizeof(trans_pcie->rf_name);
        size_t pos;
        u32 version;

        if (buf[0])
                return;

        switch (CSR_HW_RFID_TYPE(trans->hw_rf_id)) {
        case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_JF):
                pos = scnprintf(buf, buflen, "JF");
                break;
        case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_GF):
                pos = scnprintf(buf, buflen, "GF");
                break;
        case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_GF4):
                pos = scnprintf(buf, buflen, "GF4");
                break;
        case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_HR):
                pos = scnprintf(buf, buflen, "HR");
                break;
        case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_HR1):
                pos = scnprintf(buf, buflen, "HR1");
                break;
        case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_HRCDB):
                pos = scnprintf(buf, buflen, "HRCDB");
                break;
        case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_MS):
                pos = scnprintf(buf, buflen, "MS");
                break;
        case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_FM):
                pos = scnprintf(buf, buflen, "FM");
                break;
        case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_WP):
                if (SILICON_Z_STEP ==
                    CSR_HW_RFID_STEP(trans->hw_rf_id))
                        pos = scnprintf(buf, buflen, "WHTC");
                else
                        pos = scnprintf(buf, buflen, "WH");
                break;
        default:
                return;
        }

        switch (CSR_HW_RFID_TYPE(trans->hw_rf_id)) {
        case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_HR):
        case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_HR1):
        case CSR_HW_RFID_TYPE(CSR_HW_RF_ID_TYPE_HRCDB):
                version = iwl_read_prph(trans, CNVI_MBOX_C);
                switch (version) {
                case 0x20000:
                        pos += scnprintf(buf + pos, buflen - pos, " B3");
                        break;
                case 0x120000:
                        pos += scnprintf(buf + pos, buflen - pos, " B5");
                        break;
                default:
                        pos += scnprintf(buf + pos, buflen - pos,
                                         " (0x%x)", version);
                        break;
                }
                break;
        default:
                break;
        }

        pos += scnprintf(buf + pos, buflen - pos, ", rfid=0x%x",
                         trans->hw_rf_id);

        IWL_INFO(trans, "Detected RF %s\n", buf);

        /*
         * also add a \n for debugfs - need to do it after printing
         * since our IWL_INFO machinery wants to see a static \n at
         * the end of the string
         */
        pos += scnprintf(buf + pos, buflen - pos, "\n");
}

void iwl_trans_pcie_gen2_fw_alive(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

        iwl_pcie_reset_ict(trans);

        /* make sure all queue are not stopped/used */
        memset(trans_pcie->txqs.queue_stopped, 0,
               sizeof(trans_pcie->txqs.queue_stopped));
        memset(trans_pcie->txqs.queue_used, 0,
               sizeof(trans_pcie->txqs.queue_used));

        /* now that we got alive we can free the fw image & the context info.
         * paging memory cannot be freed included since FW will still use it
         */
        if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_AX210)
                iwl_pcie_ctxt_info_gen3_free(trans, true);
        else
                iwl_pcie_ctxt_info_free(trans);

        /*
         * Re-enable all the interrupts, including the RF-Kill one, now that
         * the firmware is alive.
         */
        iwl_enable_interrupts(trans);
        mutex_lock(&trans_pcie->mutex);
        iwl_pcie_check_hw_rf_kill(trans);

        iwl_pcie_get_rf_name(trans);
        mutex_unlock(&trans_pcie->mutex);
}

static bool iwl_pcie_set_ltr(struct iwl_trans *trans)
{
        u32 ltr_val = CSR_LTR_LONG_VAL_AD_NO_SNOOP_REQ |
                      u32_encode_bits(CSR_LTR_LONG_VAL_AD_SCALE_USEC,
                                      CSR_LTR_LONG_VAL_AD_NO_SNOOP_SCALE) |
                      u32_encode_bits(250,
                                      CSR_LTR_LONG_VAL_AD_NO_SNOOP_VAL) |
                      CSR_LTR_LONG_VAL_AD_SNOOP_REQ |
                      u32_encode_bits(CSR_LTR_LONG_VAL_AD_SCALE_USEC,
                                      CSR_LTR_LONG_VAL_AD_SNOOP_SCALE) |
                      u32_encode_bits(250, CSR_LTR_LONG_VAL_AD_SNOOP_VAL);

        /*
         * To workaround hardware latency issues during the boot process,
         * initialize the LTR to ~250 usec (see ltr_val above).
         * The firmware initializes this again later (to a smaller value).
         */
        if ((trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_AX210 ||
             trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_22000) &&
            !trans->trans_cfg->integrated) {
                iwl_write32(trans, CSR_LTR_LONG_VAL_AD, ltr_val);
                return true;
        }

        if (trans->trans_cfg->integrated &&
            trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_22000) {
                iwl_write_prph(trans, HPM_MAC_LTR_CSR, HPM_MAC_LRT_ENABLE_ALL);
                iwl_write_prph(trans, HPM_UMAC_LTR, ltr_val);
                return true;
        }

        if (trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_AX210) {
                /* First clear the interrupt, just in case */
                iwl_write32(trans, CSR_MSIX_HW_INT_CAUSES_AD,
                            MSIX_HW_INT_CAUSES_REG_IML);
                /* In this case, unfortunately the same ROM bug exists in the
                 * device (not setting LTR correctly), but we don't have control
                 * over the settings from the host due to some hardware security
                 * features. The only workaround we've been able to come up with
                 * so far is to try to keep the CPU and device busy by polling
                 * it and the IML (image loader) completed interrupt.
                 */
                return false;
        }

        /* nothing needs to be done on other devices */
        return true;
}

static void iwl_pcie_spin_for_iml(struct iwl_trans *trans)
{
/* in practice, this seems to complete in around 20-30ms at most, wait 100 */
#define IML_WAIT_TIMEOUT        (HZ / 10)
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        unsigned long end_time = jiffies + IML_WAIT_TIMEOUT;
        u32 value, loops = 0;
        bool irq = false;

        if (WARN_ON(!trans_pcie->iml))
                return;

        value = iwl_read32(trans, CSR_LTR_LAST_MSG);
        IWL_DEBUG_INFO(trans, "Polling for IML load - CSR_LTR_LAST_MSG=0x%x\n",
                       value);

        while (time_before(jiffies, end_time)) {
                if (iwl_read32(trans, CSR_MSIX_HW_INT_CAUSES_AD) &
                                MSIX_HW_INT_CAUSES_REG_IML) {
                        irq = true;
                        break;
                }
                /* Keep the CPU and device busy. */
                value = iwl_read32(trans, CSR_LTR_LAST_MSG);
                loops++;
        }

        IWL_DEBUG_INFO(trans,
                       "Polled for IML load: irq=%d, loops=%d, CSR_LTR_LAST_MSG=0x%x\n",
                       irq, loops, value);

        /* We don't fail here even if we timed out - maybe we get lucky and the
         * interrupt comes in later (and we get alive from firmware) and then
         * we're all happy - but if not we'll fail on alive timeout or get some
         * other error out.
         */
}

int iwl_trans_pcie_gen2_start_fw(struct iwl_trans *trans,
                                 const struct fw_img *fw, bool run_in_rfkill)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        bool hw_rfkill, keep_ram_busy;
        int ret;

        /* This may fail if AMT took ownership of the device */
        if (iwl_pcie_prepare_card_hw(trans)) {
                IWL_WARN(trans, "Exit HW not ready\n");
                return -EIO;
        }

        iwl_enable_rfkill_int(trans);

        iwl_write32(trans, CSR_INT, 0xFFFFFFFF);

        /*
         * We enabled the RF-Kill interrupt and the handler may very
         * well be running. Disable the interrupts to make sure no other
         * interrupt can be fired.
         */
        iwl_disable_interrupts(trans);

        /* Make sure it finished running */
        iwl_pcie_synchronize_irqs(trans);

        mutex_lock(&trans_pcie->mutex);

        /* If platform's RF_KILL switch is NOT set to KILL */
        hw_rfkill = iwl_pcie_check_hw_rf_kill(trans);
        if (hw_rfkill && !run_in_rfkill) {
                ret = -ERFKILL;
                goto out;
        }

        /* Someone called stop_device, don't try to start_fw */
        if (trans_pcie->is_down) {
                IWL_WARN(trans,
                         "Can't start_fw since the HW hasn't been started\n");
                ret = -EIO;
                goto out;
        }

        /* make sure rfkill handshake bits are cleared */
        iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
        iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR,
                    CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);

        /* clear (again), then enable host interrupts */
        iwl_write32(trans, CSR_INT, 0xFFFFFFFF);

        ret = iwl_pcie_gen2_nic_init(trans);
        if (ret) {
                IWL_ERR(trans, "Unable to init nic\n");
                goto out;
        }

        if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_AX210)
                ret = iwl_pcie_ctxt_info_gen3_init(trans, fw);
        else
                ret = iwl_pcie_ctxt_info_init(trans, fw);
        if (ret)
                goto out;

        keep_ram_busy = !iwl_pcie_set_ltr(trans);

        if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_BZ) {
                IWL_DEBUG_POWER(trans, "function scratch register value is 0x%08x\n",
                                iwl_read32(trans, CSR_FUNC_SCRATCH));
                iwl_write32(trans, CSR_FUNC_SCRATCH, CSR_FUNC_SCRATCH_INIT_VALUE);
                iwl_set_bit(trans, CSR_GP_CNTRL,
                            CSR_GP_CNTRL_REG_FLAG_ROM_START);
        } else if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_AX210) {
                iwl_write_umac_prph(trans, UREG_CPU_INIT_RUN, 1);
        } else {
                iwl_write_prph(trans, UREG_CPU_INIT_RUN, 1);
        }

        if (keep_ram_busy)
                iwl_pcie_spin_for_iml(trans);

        /* re-check RF-Kill state since we may have missed the interrupt */
        hw_rfkill = iwl_pcie_check_hw_rf_kill(trans);
        if (hw_rfkill && !run_in_rfkill)
                ret = -ERFKILL;

out:
        mutex_unlock(&trans_pcie->mutex);
        return ret;
}