/*
 * Copyright 2014 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#include "amdgpu.h"
#include "nbio/nbio_6_1_offset.h"
#include "nbio/nbio_6_1_sh_mask.h"
#include "gc/gc_9_0_offset.h"
#include "gc/gc_9_0_sh_mask.h"
#include "mp/mp_9_0_offset.h"
#include "soc15.h"
#include "vega10_ih.h"
#include "soc15_common.h"
#include "mxgpu_ai.h"

#include "amdgpu_reset.h"

static void xgpu_ai_mailbox_send_ack(struct amdgpu_device *adev)
{
        WREG8(AI_MAIBOX_CONTROL_RCV_OFFSET_BYTE, 2);
}

static void xgpu_ai_mailbox_set_valid(struct amdgpu_device *adev, bool val)
{
        WREG8(AI_MAIBOX_CONTROL_TRN_OFFSET_BYTE, val ? 1 : 0);
}

/*
 * this peek_msg could *only* be called in IRQ routine becuase in IRQ routine
 * RCV_MSG_VALID filed of BIF_BX_PF0_MAILBOX_CONTROL must already be set to 1
 * by host.
 *
 * if called no in IRQ routine, this peek_msg cannot guaranteed to return the
 * correct value since it doesn't return the RCV_DW0 under the case that
 * RCV_MSG_VALID is set by host.
 */
static enum idh_event xgpu_ai_mailbox_peek_msg(struct amdgpu_device *adev)
{
        return RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
                                mmBIF_BX_PF0_MAILBOX_MSGBUF_RCV_DW0));
}


static int xgpu_ai_mailbox_rcv_msg(struct amdgpu_device *adev,
                                   enum idh_event event)
{
        u32 reg;

        reg = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
                                             mmBIF_BX_PF0_MAILBOX_MSGBUF_RCV_DW0));
        if (reg != event)
                return -ENOENT;

        xgpu_ai_mailbox_send_ack(adev);

        return 0;
}

static uint8_t xgpu_ai_peek_ack(struct amdgpu_device *adev) {
        return RREG8(AI_MAIBOX_CONTROL_TRN_OFFSET_BYTE) & 2;
}

static int xgpu_ai_poll_ack(struct amdgpu_device *adev)
{
        int timeout  = AI_MAILBOX_POLL_ACK_TIMEDOUT;
        u8 reg;

        do {
                reg = RREG8(AI_MAIBOX_CONTROL_TRN_OFFSET_BYTE);
                if (reg & 2)
                        return 0;

                mdelay(5);
                timeout -= 5;
        } while (timeout > 1);

        dev_err(adev->dev, "Doesn't get TRN_MSG_ACK from pf in %d msec\n", AI_MAILBOX_POLL_ACK_TIMEDOUT);

        return -ETIME;
}

static int xgpu_ai_poll_msg(struct amdgpu_device *adev, enum idh_event event)
{
        int r, timeout = AI_MAILBOX_POLL_MSG_TIMEDOUT;

        do {
                r = xgpu_ai_mailbox_rcv_msg(adev, event);
                if (!r)
                        return 0;

                msleep(10);
                timeout -= 10;
        } while (timeout > 1);

        dev_err(adev->dev, "Doesn't get msg:%d from pf, error=%d\n", event, r);

        return -ETIME;
}

static void xgpu_ai_mailbox_trans_msg (struct amdgpu_device *adev,
              enum idh_request req, u32 data1, u32 data2, u32 data3) {
        u32 reg;
        int r;
        uint8_t trn;

        /* IMPORTANT:
         * clear TRN_MSG_VALID valid to clear host's RCV_MSG_ACK
         * and with host's RCV_MSG_ACK cleared hw automatically clear host's RCV_MSG_ACK
         * which lead to VF's TRN_MSG_ACK cleared, otherwise below xgpu_ai_poll_ack()
         * will return immediatly
         */
        do {
                xgpu_ai_mailbox_set_valid(adev, false);
                trn = xgpu_ai_peek_ack(adev);
                if (trn) {
                        dev_err_ratelimited(adev->dev, "trn=%x ACK should not assert! wait again !\n", trn);
                        msleep(1);
                }
        } while(trn);

        reg = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
                                             mmBIF_BX_PF0_MAILBOX_MSGBUF_TRN_DW0));
        reg = REG_SET_FIELD(reg, BIF_BX_PF0_MAILBOX_MSGBUF_TRN_DW0,
                            MSGBUF_DATA, req);
        WREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_MSGBUF_TRN_DW0),
                      reg);
        WREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_MSGBUF_TRN_DW1),
                                data1);
        WREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_MSGBUF_TRN_DW2),
                                data2);
        WREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_MSGBUF_TRN_DW3),
                                data3);

        xgpu_ai_mailbox_set_valid(adev, true);

        /* start to poll ack */
        r = xgpu_ai_poll_ack(adev);
        if (r)
                dev_err(adev->dev, "Doesn't get ack from pf, continue\n");

        xgpu_ai_mailbox_set_valid(adev, false);
}

static int xgpu_ai_send_access_requests(struct amdgpu_device *adev,
                                        enum idh_request req)
{
        int r;

        xgpu_ai_mailbox_trans_msg(adev, req, 0, 0, 0);

        /* start to check msg if request is idh_req_gpu_init_access */
        if (req == IDH_REQ_GPU_INIT_ACCESS ||
                req == IDH_REQ_GPU_FINI_ACCESS ||
                req == IDH_REQ_GPU_RESET_ACCESS) {
                r = xgpu_ai_poll_msg(adev, IDH_READY_TO_ACCESS_GPU);
                if (r) {
                        dev_err(adev->dev, "Doesn't get READY_TO_ACCESS_GPU from pf, give up\n");
                        return r;
                }
                /* Retrieve checksum from mailbox2 */
                if (req == IDH_REQ_GPU_INIT_ACCESS || req == IDH_REQ_GPU_RESET_ACCESS) {
                        adev->virt.fw_reserve.checksum_key =
                                RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
                                        mmBIF_BX_PF0_MAILBOX_MSGBUF_RCV_DW2));
                }
        } else if (req == IDH_REQ_GPU_INIT_DATA){
                /* Dummy REQ_GPU_INIT_DATA handling */
                r = xgpu_ai_poll_msg(adev, IDH_REQ_GPU_INIT_DATA_READY);
                /* version set to 0 since dummy */
                adev->virt.req_init_data_ver = 0;       
        }

        return 0;
}

static int xgpu_ai_request_reset(struct amdgpu_device *adev)
{
        int ret, i = 0;

        while (i < AI_MAILBOX_POLL_MSG_REP_MAX) {
                ret = xgpu_ai_send_access_requests(adev, IDH_REQ_GPU_RESET_ACCESS);
                if (!ret)
                        break;
                i++;
        }

        return ret;
}

static int xgpu_ai_request_full_gpu_access(struct amdgpu_device *adev,
                                           bool init)
{
        enum idh_request req;

        req = init ? IDH_REQ_GPU_INIT_ACCESS : IDH_REQ_GPU_FINI_ACCESS;
        return xgpu_ai_send_access_requests(adev, req);
}

static int xgpu_ai_release_full_gpu_access(struct amdgpu_device *adev,
                                           bool init)
{
        enum idh_request req;
        int r = 0;

        req = init ? IDH_REL_GPU_INIT_ACCESS : IDH_REL_GPU_FINI_ACCESS;
        r = xgpu_ai_send_access_requests(adev, req);

        return r;
}

static int xgpu_ai_mailbox_ack_irq(struct amdgpu_device *adev,
                                        struct amdgpu_irq_src *source,
                                        struct amdgpu_iv_entry *entry)
{
        dev_dbg(adev->dev, "get ack intr and do nothing.\n");
        return 0;
}

static int xgpu_ai_set_mailbox_ack_irq(struct amdgpu_device *adev,
                                        struct amdgpu_irq_src *source,
                                        unsigned type,
                                        enum amdgpu_interrupt_state state)
{
        u32 tmp = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_INT_CNTL));

        tmp = REG_SET_FIELD(tmp, BIF_BX_PF0_MAILBOX_INT_CNTL, ACK_INT_EN,
                                (state == AMDGPU_IRQ_STATE_ENABLE) ? 1 : 0);
        WREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_INT_CNTL), tmp);

        return 0;
}

static void xgpu_ai_ready_to_reset(struct amdgpu_device *adev)
{
        xgpu_ai_mailbox_trans_msg(adev, IDH_READY_TO_RESET, 0, 0, 0);
}

static int xgpu_ai_wait_reset(struct amdgpu_device *adev)
{
        int timeout = AI_MAILBOX_POLL_FLR_TIMEDOUT;
        do {
                if (xgpu_ai_mailbox_peek_msg(adev) == IDH_FLR_NOTIFICATION_CMPL) {
                        dev_dbg(adev->dev, "Got AI IDH_FLR_NOTIFICATION_CMPL after %d ms\n", AI_MAILBOX_POLL_FLR_TIMEDOUT - timeout);
                        return 0;
                }
                msleep(10);
                timeout -= 10;
        } while (timeout > 1);

        dev_dbg(adev->dev, "waiting AI IDH_FLR_NOTIFICATION_CMPL timeout\n");
        return -ETIME;
}

static void xgpu_ai_mailbox_flr_work(struct work_struct *work)
{
        struct amdgpu_virt *virt = container_of(work, struct amdgpu_virt, flr_work);
        struct amdgpu_device *adev = container_of(virt, struct amdgpu_device, virt);
        struct amdgpu_reset_context reset_context = { 0 };

        amdgpu_virt_fini_data_exchange(adev);

        /* Trigger recovery for world switch failure if no TDR */
        if (amdgpu_device_should_recover_gpu(adev)
                && (!amdgpu_device_has_job_running(adev) ||
                        adev->sdma_timeout == MAX_SCHEDULE_TIMEOUT)) {

                reset_context.method = AMD_RESET_METHOD_NONE;
                reset_context.reset_req_dev = adev;
                clear_bit(AMDGPU_NEED_FULL_RESET, &reset_context.flags);
                set_bit(AMDGPU_HOST_FLR, &reset_context.flags);

                amdgpu_device_gpu_recover(adev, NULL, &reset_context);
        }
}

static void xgpu_ai_mailbox_req_bad_pages_work(struct work_struct *work)
{
        struct amdgpu_virt *virt = container_of(work, struct amdgpu_virt, req_bad_pages_work);
        struct amdgpu_device *adev = container_of(virt, struct amdgpu_device, virt);

        if (down_read_trylock(&adev->reset_domain->sem)) {
                amdgpu_virt_fini_data_exchange(adev);
                amdgpu_virt_request_bad_pages(adev);
                up_read(&adev->reset_domain->sem);
        }
}

/**
 * xgpu_ai_mailbox_handle_bad_pages_work - Reinitialize the data exchange region to get fresh bad page information
 * @work: pointer to the work_struct
 *
 * This work handler is triggered when bad pages are ready, and it reinitializes
 * the data exchange region to retrieve updated bad page information from the host.
 */
static void xgpu_ai_mailbox_handle_bad_pages_work(struct work_struct *work)
{
        struct amdgpu_virt *virt = container_of(work, struct amdgpu_virt, handle_bad_pages_work);
        struct amdgpu_device *adev = container_of(virt, struct amdgpu_device, virt);

        if (down_read_trylock(&adev->reset_domain->sem)) {
                amdgpu_virt_fini_data_exchange(adev);
                amdgpu_virt_init_data_exchange(adev);
                up_read(&adev->reset_domain->sem);
        }
}

static int xgpu_ai_set_mailbox_rcv_irq(struct amdgpu_device *adev,
                                       struct amdgpu_irq_src *src,
                                       unsigned type,
                                       enum amdgpu_interrupt_state state)
{
        u32 tmp = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_INT_CNTL));

        tmp = REG_SET_FIELD(tmp, BIF_BX_PF0_MAILBOX_INT_CNTL, VALID_INT_EN,
                            (state == AMDGPU_IRQ_STATE_ENABLE) ? 1 : 0);
        WREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_INT_CNTL), tmp);

        return 0;
}

static int xgpu_ai_mailbox_rcv_irq(struct amdgpu_device *adev,
                                   struct amdgpu_irq_src *source,
                                   struct amdgpu_iv_entry *entry)
{
        enum idh_event event = xgpu_ai_mailbox_peek_msg(adev);
        struct amdgpu_ras *ras = amdgpu_ras_get_context(adev);

        switch (event) {
        case IDH_RAS_BAD_PAGES_READY:
                xgpu_ai_mailbox_send_ack(adev);
                if (amdgpu_sriov_runtime(adev))
                        schedule_work(&adev->virt.handle_bad_pages_work);
                break;
        case IDH_RAS_BAD_PAGES_NOTIFICATION:
                xgpu_ai_mailbox_send_ack(adev);
                if (amdgpu_sriov_runtime(adev))
                        schedule_work(&adev->virt.req_bad_pages_work);
                break;
        case IDH_UNRECOV_ERR_NOTIFICATION:
                xgpu_ai_mailbox_send_ack(adev);
                ras->is_rma = true;
                dev_err(adev->dev, "VF is in an unrecoverable state. Runtime Services are halted.\n");
                if (amdgpu_sriov_runtime(adev))
                        WARN_ONCE(!amdgpu_reset_domain_schedule(adev->reset_domain,
                                        &adev->virt.flr_work),
                                        "Failed to queue work! at %s",
                                        __func__);
                break;
        case IDH_FLR_NOTIFICATION:
                if (amdgpu_sriov_runtime(adev))
                        WARN_ONCE(!amdgpu_reset_domain_schedule(adev->reset_domain,
                                                &adev->virt.flr_work),
                                        "Failed to queue work! at %s",
                                        __func__);
                break;
        case IDH_QUERY_ALIVE:
                xgpu_ai_mailbox_send_ack(adev);
                break;
        /* READY_TO_ACCESS_GPU is fetched by kernel polling, IRQ can ignore
         * it byfar since that polling thread will handle it,
         * other msg like flr complete is not handled here.
         */
        case IDH_CLR_MSG_BUF:
        case IDH_FLR_NOTIFICATION_CMPL:
        case IDH_READY_TO_ACCESS_GPU:
        default:
                break;
        }

        return 0;
}

static const struct amdgpu_irq_src_funcs xgpu_ai_mailbox_ack_irq_funcs = {
        .set = xgpu_ai_set_mailbox_ack_irq,
        .process = xgpu_ai_mailbox_ack_irq,
};

static const struct amdgpu_irq_src_funcs xgpu_ai_mailbox_rcv_irq_funcs = {
        .set = xgpu_ai_set_mailbox_rcv_irq,
        .process = xgpu_ai_mailbox_rcv_irq,
};

void xgpu_ai_mailbox_set_irq_funcs(struct amdgpu_device *adev)
{
        adev->virt.ack_irq.num_types = 1;
        adev->virt.ack_irq.funcs = &xgpu_ai_mailbox_ack_irq_funcs;
        adev->virt.rcv_irq.num_types = 1;
        adev->virt.rcv_irq.funcs = &xgpu_ai_mailbox_rcv_irq_funcs;
}

int xgpu_ai_mailbox_add_irq_id(struct amdgpu_device *adev)
{
        int r;

        r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_BIF, 135, &adev->virt.rcv_irq);
        if (r)
                return r;

        r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_BIF, 138, &adev->virt.ack_irq);
        if (r) {
                amdgpu_irq_put(adev, &adev->virt.rcv_irq, 0);
                return r;
        }

        return 0;
}

int xgpu_ai_mailbox_get_irq(struct amdgpu_device *adev)
{
        int r;

        r = amdgpu_irq_get(adev, &adev->virt.rcv_irq, 0);
        if (r)
                return r;
        r = amdgpu_irq_get(adev, &adev->virt.ack_irq, 0);
        if (r) {
                amdgpu_irq_put(adev, &adev->virt.rcv_irq, 0);
                return r;
        }

        INIT_WORK(&adev->virt.flr_work, xgpu_ai_mailbox_flr_work);
        INIT_WORK(&adev->virt.req_bad_pages_work, xgpu_ai_mailbox_req_bad_pages_work);
        INIT_WORK(&adev->virt.handle_bad_pages_work, xgpu_ai_mailbox_handle_bad_pages_work);

        return 0;
}

void xgpu_ai_mailbox_put_irq(struct amdgpu_device *adev)
{
        amdgpu_irq_put(adev, &adev->virt.ack_irq, 0);
        amdgpu_irq_put(adev, &adev->virt.rcv_irq, 0);
}

static int xgpu_ai_request_init_data(struct amdgpu_device *adev)
{
        return xgpu_ai_send_access_requests(adev, IDH_REQ_GPU_INIT_DATA);
}

static void xgpu_ai_ras_poison_handler(struct amdgpu_device *adev,
                                        enum amdgpu_ras_block block)
{
        xgpu_ai_send_access_requests(adev, IDH_RAS_POISON);
}

static bool xgpu_ai_rcvd_ras_intr(struct amdgpu_device *adev)
{
        enum idh_event msg = xgpu_ai_mailbox_peek_msg(adev);

        return (msg == IDH_RAS_ERROR_DETECTED || msg == 0xFFFFFFFF);
}

const struct amdgpu_virt_ops xgpu_ai_virt_ops = {
        .req_full_gpu   = xgpu_ai_request_full_gpu_access,
        .rel_full_gpu   = xgpu_ai_release_full_gpu_access,
        .reset_gpu = xgpu_ai_request_reset,
        .ready_to_reset = xgpu_ai_ready_to_reset,
        .wait_reset = xgpu_ai_wait_reset,
        .trans_msg = xgpu_ai_mailbox_trans_msg,
        .req_init_data  = xgpu_ai_request_init_data,
        .ras_poison_handler = xgpu_ai_ras_poison_handler,
        .rcvd_ras_intr = xgpu_ai_rcvd_ras_intr,
};