/*
 * Virtio GPU Device
 *
 * Copyright Red Hat, Inc. 2013-2014
 *
 * Authors:
 *     Dave Airlie <airlied@redhat.com>
 *     Gerd Hoffmann <kraxel@redhat.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 */

#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qemu/iov.h"
#include "trace.h"
#include "hw/virtio/virtio.h"
#include "hw/virtio/virtio-gpu.h"
#include "qapi/error.h"

#ifdef CONFIG_VIRGL

#include <virglrenderer.h>

static struct virgl_renderer_callbacks virtio_gpu_3d_cbs;

static void virgl_cmd_create_resource_2d(VirtIOGPU *g,
                                         struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_resource_create_2d c2d;
    struct virgl_renderer_resource_create_args args;

    VIRTIO_GPU_FILL_CMD(c2d);
    trace_virtio_gpu_cmd_res_create_2d(c2d.resource_id, c2d.format,
                                       c2d.width, c2d.height);

    args.handle = c2d.resource_id;
    args.target = 2;
    args.format = c2d.format;
    args.bind = (1 << 1);
    args.width = c2d.width;
    args.height = c2d.height;
    args.depth = 1;
    args.array_size = 1;
    args.last_level = 0;
    args.nr_samples = 0;
    args.flags = VIRTIO_GPU_RESOURCE_FLAG_Y_0_TOP;
    virgl_renderer_resource_create(&args, NULL, 0);
}

static void virgl_cmd_create_resource_3d(VirtIOGPU *g,
                                         struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_resource_create_3d c3d;
    struct virgl_renderer_resource_create_args args;

    VIRTIO_GPU_FILL_CMD(c3d);
    trace_virtio_gpu_cmd_res_create_3d(c3d.resource_id, c3d.format,
                                       c3d.width, c3d.height, c3d.depth);

    args.handle = c3d.resource_id;
    args.target = c3d.target;
    args.format = c3d.format;
    args.bind = c3d.bind;
    args.width = c3d.width;
    args.height = c3d.height;
    args.depth = c3d.depth;
    args.array_size = c3d.array_size;
    args.last_level = c3d.last_level;
    args.nr_samples = c3d.nr_samples;
    args.flags = c3d.flags;
    virgl_renderer_resource_create(&args, NULL, 0);
}

static void virgl_cmd_resource_unref(VirtIOGPU *g,
                                     struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_resource_unref unref;
    struct iovec *res_iovs = NULL;
    int num_iovs = 0;

    VIRTIO_GPU_FILL_CMD(unref);
    trace_virtio_gpu_cmd_res_unref(unref.resource_id);

    virgl_renderer_resource_detach_iov(unref.resource_id,
                                       &res_iovs,
                                       &num_iovs);
    if (res_iovs != NULL && num_iovs != 0) {
        virtio_gpu_cleanup_mapping_iov(res_iovs, num_iovs);
    }
    virgl_renderer_resource_unref(unref.resource_id);
}

static void virgl_cmd_context_create(VirtIOGPU *g,
                                     struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_ctx_create cc;

    VIRTIO_GPU_FILL_CMD(cc);
    trace_virtio_gpu_cmd_ctx_create(cc.hdr.ctx_id,
                                    cc.debug_name);

    virgl_renderer_context_create(cc.hdr.ctx_id, cc.nlen,
                                  cc.debug_name);
}

static void virgl_cmd_context_destroy(VirtIOGPU *g,
                                      struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_ctx_destroy cd;

    VIRTIO_GPU_FILL_CMD(cd);
    trace_virtio_gpu_cmd_ctx_destroy(cd.hdr.ctx_id);

    virgl_renderer_context_destroy(cd.hdr.ctx_id);
}

static void virtio_gpu_rect_update(VirtIOGPU *g, int idx, int x, int y,
                                int width, int height)
{
    if (!g->scanout[idx].con) {
        return;
    }

    dpy_gl_update(g->scanout[idx].con, x, y, width, height);
}

static void virgl_cmd_resource_flush(VirtIOGPU *g,
                                     struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_resource_flush rf;
    int i;

    VIRTIO_GPU_FILL_CMD(rf);
    trace_virtio_gpu_cmd_res_flush(rf.resource_id,
                                   rf.r.width, rf.r.height, rf.r.x, rf.r.y);

    for (i = 0; i < g->conf.max_outputs; i++) {
        if (g->scanout[i].resource_id != rf.resource_id) {
            continue;
        }
        virtio_gpu_rect_update(g, i, rf.r.x, rf.r.y, rf.r.width, rf.r.height);
    }
}

static void virgl_cmd_set_scanout(VirtIOGPU *g,
                                  struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_set_scanout ss;
    struct virgl_renderer_resource_info info;
    int ret;

    VIRTIO_GPU_FILL_CMD(ss);
    trace_virtio_gpu_cmd_set_scanout(ss.scanout_id, ss.resource_id,
                                     ss.r.width, ss.r.height, ss.r.x, ss.r.y);

    if (ss.scanout_id >= g->conf.max_outputs) {
        qemu_log_mask(LOG_GUEST_ERROR, "%s: illegal scanout id specified %d",
                      __func__, ss.scanout_id);
        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_SCANOUT_ID;
        return;
    }
    g->enable = 1;

    memset(&info, 0, sizeof(info));

    if (ss.resource_id && ss.r.width && ss.r.height) {
        ret = virgl_renderer_resource_get_info(ss.resource_id, &info);
        if (ret == -1) {
            qemu_log_mask(LOG_GUEST_ERROR,
                          "%s: illegal resource specified %d\n",
                          __func__, ss.resource_id);
            cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
            return;
        }
        qemu_console_resize(g->scanout[ss.scanout_id].con,
                            ss.r.width, ss.r.height);
        virgl_renderer_force_ctx_0();
        dpy_gl_scanout_texture(g->scanout[ss.scanout_id].con, info.tex_id,
                               info.flags & 1 /* FIXME: Y_0_TOP */,
                               info.width, info.height,
                               ss.r.x, ss.r.y, ss.r.width, ss.r.height);
    } else {
        if (ss.scanout_id != 0) {
            dpy_gfx_replace_surface(g->scanout[ss.scanout_id].con, NULL);
        }
        dpy_gl_scanout_disable(g->scanout[ss.scanout_id].con);
    }
    g->scanout[ss.scanout_id].resource_id = ss.resource_id;
}

static void virgl_cmd_submit_3d(VirtIOGPU *g,
                                struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_cmd_submit cs;
    void *buf;
    size_t s;

    VIRTIO_GPU_FILL_CMD(cs);
    trace_virtio_gpu_cmd_ctx_submit(cs.hdr.ctx_id, cs.size);

    buf = g_malloc(cs.size);
    s = iov_to_buf(cmd->elem.out_sg, cmd->elem.out_num,
                   sizeof(cs), buf, cs.size);
    if (s != cs.size) {
        qemu_log_mask(LOG_GUEST_ERROR, "%s: size mismatch (%zd/%d)",
                      __func__, s, cs.size);
        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
        goto out;
    }

    if (virtio_gpu_stats_enabled(g->conf)) {
        g->stats.req_3d++;
        g->stats.bytes_3d += cs.size;
    }

    virgl_renderer_submit_cmd(buf, cs.hdr.ctx_id, cs.size / 4);

out:
    g_free(buf);
}

static void virgl_cmd_transfer_to_host_2d(VirtIOGPU *g,
                                          struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_transfer_to_host_2d t2d;
    struct virtio_gpu_box box;

    VIRTIO_GPU_FILL_CMD(t2d);
    trace_virtio_gpu_cmd_res_xfer_toh_2d(t2d.resource_id);

    box.x = t2d.r.x;
    box.y = t2d.r.y;
    box.z = 0;
    box.w = t2d.r.width;
    box.h = t2d.r.height;
    box.d = 1;

    virgl_renderer_transfer_write_iov(t2d.resource_id,
                                      0,
                                      0,
                                      0,
                                      0,
                                      (struct virgl_box *)&box,
                                      t2d.offset, NULL, 0);
}

static void virgl_cmd_transfer_to_host_3d(VirtIOGPU *g,
                                          struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_transfer_host_3d t3d;

    VIRTIO_GPU_FILL_CMD(t3d);
    trace_virtio_gpu_cmd_res_xfer_toh_3d(t3d.resource_id);

    virgl_renderer_transfer_write_iov(t3d.resource_id,
                                      t3d.hdr.ctx_id,
                                      t3d.level,
                                      t3d.stride,
                                      t3d.layer_stride,
                                      (struct virgl_box *)&t3d.box,
                                      t3d.offset, NULL, 0);
}

static void
virgl_cmd_transfer_from_host_3d(VirtIOGPU *g,
                                struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_transfer_host_3d tf3d;

    VIRTIO_GPU_FILL_CMD(tf3d);
    trace_virtio_gpu_cmd_res_xfer_fromh_3d(tf3d.resource_id);

    virgl_renderer_transfer_read_iov(tf3d.resource_id,
                                     tf3d.hdr.ctx_id,
                                     tf3d.level,
                                     tf3d.stride,
                                     tf3d.layer_stride,
                                     (struct virgl_box *)&tf3d.box,
                                     tf3d.offset, NULL, 0);
}


static void virgl_resource_attach_backing(VirtIOGPU *g,
                                          struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_resource_attach_backing att_rb;
    struct iovec *res_iovs;
    int ret;

    VIRTIO_GPU_FILL_CMD(att_rb);
    trace_virtio_gpu_cmd_res_back_attach(att_rb.resource_id);

    ret = virtio_gpu_create_mapping_iov(&att_rb, cmd, NULL, &res_iovs);
    if (ret != 0) {
        cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
        return;
    }

    ret = virgl_renderer_resource_attach_iov(att_rb.resource_id,
                                             res_iovs, att_rb.nr_entries);

    if (ret != 0)
        virtio_gpu_cleanup_mapping_iov(res_iovs, att_rb.nr_entries);
}

static void virgl_resource_detach_backing(VirtIOGPU *g,
                                          struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_resource_detach_backing detach_rb;
    struct iovec *res_iovs = NULL;
    int num_iovs = 0;

    VIRTIO_GPU_FILL_CMD(detach_rb);
    trace_virtio_gpu_cmd_res_back_detach(detach_rb.resource_id);

    virgl_renderer_resource_detach_iov(detach_rb.resource_id,
                                       &res_iovs,
                                       &num_iovs);
    if (res_iovs == NULL || num_iovs == 0) {
        return;
    }
    virtio_gpu_cleanup_mapping_iov(res_iovs, num_iovs);
}


static void virgl_cmd_ctx_attach_resource(VirtIOGPU *g,
                                          struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_ctx_resource att_res;

    VIRTIO_GPU_FILL_CMD(att_res);
    trace_virtio_gpu_cmd_ctx_res_attach(att_res.hdr.ctx_id,
                                        att_res.resource_id);

    virgl_renderer_ctx_attach_resource(att_res.hdr.ctx_id, att_res.resource_id);
}

static void virgl_cmd_ctx_detach_resource(VirtIOGPU *g,
                                          struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_ctx_resource det_res;

    VIRTIO_GPU_FILL_CMD(det_res);
    trace_virtio_gpu_cmd_ctx_res_detach(det_res.hdr.ctx_id,
                                        det_res.resource_id);

    virgl_renderer_ctx_detach_resource(det_res.hdr.ctx_id, det_res.resource_id);
}

static void virgl_cmd_get_capset_info(VirtIOGPU *g,
                                      struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_get_capset_info info;
    struct virtio_gpu_resp_capset_info resp;

    VIRTIO_GPU_FILL_CMD(info);

    memset(&resp, 0, sizeof(resp));
    if (info.capset_index == 0) {
        resp.capset_id = VIRTIO_GPU_CAPSET_VIRGL;
        virgl_renderer_get_cap_set(resp.capset_id,
                                   &resp.capset_max_version,
                                   &resp.capset_max_size);
    } else {
        resp.capset_max_version = 0;
        resp.capset_max_size = 0;
    }
    resp.hdr.type = VIRTIO_GPU_RESP_OK_CAPSET_INFO;
    virtio_gpu_ctrl_response(g, cmd, &resp.hdr, sizeof(resp));
}

static void virgl_cmd_get_capset(VirtIOGPU *g,
                                 struct virtio_gpu_ctrl_command *cmd)
{
    struct virtio_gpu_get_capset gc;
    struct virtio_gpu_resp_capset *resp;
    uint32_t max_ver, max_size;
    VIRTIO_GPU_FILL_CMD(gc);

    virgl_renderer_get_cap_set(gc.capset_id, &max_ver,
                               &max_size);
    if (!max_size) {
        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
        return;
    }

    resp = g_malloc0(sizeof(*resp) + max_size);
    resp->hdr.type = VIRTIO_GPU_RESP_OK_CAPSET;
    virgl_renderer_fill_caps(gc.capset_id,
                             gc.capset_version,
                             (void *)resp->capset_data);
    virtio_gpu_ctrl_response(g, cmd, &resp->hdr, sizeof(*resp) + max_size);
    g_free(resp);
}

void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
                                      struct virtio_gpu_ctrl_command *cmd)
{
    VIRTIO_GPU_FILL_CMD(cmd->cmd_hdr);

    cmd->waiting = g->renderer_blocked;
    if (cmd->waiting) {
        return;
    }

    virgl_renderer_force_ctx_0();
    switch (cmd->cmd_hdr.type) {
    case VIRTIO_GPU_CMD_CTX_CREATE:
        virgl_cmd_context_create(g, cmd);
        break;
    case VIRTIO_GPU_CMD_CTX_DESTROY:
        virgl_cmd_context_destroy(g, cmd);
        break;
    case VIRTIO_GPU_CMD_RESOURCE_CREATE_2D:
        virgl_cmd_create_resource_2d(g, cmd);
        break;
    case VIRTIO_GPU_CMD_RESOURCE_CREATE_3D:
        virgl_cmd_create_resource_3d(g, cmd);
        break;
    case VIRTIO_GPU_CMD_SUBMIT_3D:
        virgl_cmd_submit_3d(g, cmd);
        break;
    case VIRTIO_GPU_CMD_TRANSFER_TO_HOST_2D:
        virgl_cmd_transfer_to_host_2d(g, cmd);
        break;
    case VIRTIO_GPU_CMD_TRANSFER_TO_HOST_3D:
        virgl_cmd_transfer_to_host_3d(g, cmd);
        break;
    case VIRTIO_GPU_CMD_TRANSFER_FROM_HOST_3D:
        virgl_cmd_transfer_from_host_3d(g, cmd);
        break;
    case VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING:
        virgl_resource_attach_backing(g, cmd);
        break;
    case VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING:
        virgl_resource_detach_backing(g, cmd);
        break;
    case VIRTIO_GPU_CMD_SET_SCANOUT:
        virgl_cmd_set_scanout(g, cmd);
        break;
    case VIRTIO_GPU_CMD_RESOURCE_FLUSH:
        virgl_cmd_resource_flush(g, cmd);
       break;
    case VIRTIO_GPU_CMD_RESOURCE_UNREF:
        virgl_cmd_resource_unref(g, cmd);
        break;
    case VIRTIO_GPU_CMD_CTX_ATTACH_RESOURCE:
        /* TODO add security */
        virgl_cmd_ctx_attach_resource(g, cmd);
        break;
    case VIRTIO_GPU_CMD_CTX_DETACH_RESOURCE:
        /* TODO add security */
        virgl_cmd_ctx_detach_resource(g, cmd);
        break;
    case VIRTIO_GPU_CMD_GET_CAPSET_INFO:
        virgl_cmd_get_capset_info(g, cmd);
        break;
    case VIRTIO_GPU_CMD_GET_CAPSET:
        virgl_cmd_get_capset(g, cmd);
        break;

    case VIRTIO_GPU_CMD_GET_DISPLAY_INFO:
        virtio_gpu_get_display_info(g, cmd);
        break;
    default:
        cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
        break;
    }

    if (cmd->finished) {
        return;
    }
    if (cmd->error) {
        fprintf(stderr, "%s: ctrl 0x%x, error 0x%x\n", __func__,
                cmd->cmd_hdr.type, cmd->error);
        virtio_gpu_ctrl_response_nodata(g, cmd, cmd->error);
        return;
    }
    if (!(cmd->cmd_hdr.flags & VIRTIO_GPU_FLAG_FENCE)) {
        virtio_gpu_ctrl_response_nodata(g, cmd, VIRTIO_GPU_RESP_OK_NODATA);
        return;
    }

    trace_virtio_gpu_fence_ctrl(cmd->cmd_hdr.fence_id, cmd->cmd_hdr.type);
    virgl_renderer_create_fence(cmd->cmd_hdr.fence_id, cmd->cmd_hdr.type);
}

static void virgl_write_fence(void *opaque, uint32_t fence)
{
    VirtIOGPU *g = opaque;
    struct virtio_gpu_ctrl_command *cmd, *tmp;

    QTAILQ_FOREACH_SAFE(cmd, &g->fenceq, next, tmp) {
        /*
	 * the guest can end up emitting fences out of order
	 * so we should check all fenced cmds not just the first one.
	 */
        if (cmd->cmd_hdr.fence_id > fence) {
            continue;
        }
        trace_virtio_gpu_fence_resp(cmd->cmd_hdr.fence_id);
        virtio_gpu_ctrl_response_nodata(g, cmd, VIRTIO_GPU_RESP_OK_NODATA);
        QTAILQ_REMOVE(&g->fenceq, cmd, next);
        g_free(cmd);
        g->inflight--;
        if (virtio_gpu_stats_enabled(g->conf)) {
            fprintf(stderr, "inflight: %3d (-)\r", g->inflight);
        }
    }
}

static virgl_renderer_gl_context
virgl_create_context(void *opaque, int scanout_idx,
                     struct virgl_renderer_gl_ctx_param *params)
{
    VirtIOGPU *g = opaque;
    QEMUGLContext ctx;
    QEMUGLParams qparams;

    qparams.major_ver = params->major_ver;
    qparams.minor_ver = params->minor_ver;

    ctx = dpy_gl_ctx_create(g->scanout[scanout_idx].con, &qparams);
    return (virgl_renderer_gl_context)ctx;
}

static void virgl_destroy_context(void *opaque, virgl_renderer_gl_context ctx)
{
    VirtIOGPU *g = opaque;
    QEMUGLContext qctx = (QEMUGLContext)ctx;

    dpy_gl_ctx_destroy(g->scanout[0].con, qctx);
}

static int virgl_make_context_current(void *opaque, int scanout_idx,
                                      virgl_renderer_gl_context ctx)
{
    VirtIOGPU *g = opaque;
    QEMUGLContext qctx = (QEMUGLContext)ctx;

    return dpy_gl_ctx_make_current(g->scanout[scanout_idx].con, qctx);
}

static struct virgl_renderer_callbacks virtio_gpu_3d_cbs = {
    .version             = 1,
    .write_fence         = virgl_write_fence,
    .create_gl_context   = virgl_create_context,
    .destroy_gl_context  = virgl_destroy_context,
    .make_current        = virgl_make_context_current,
};

static void virtio_gpu_print_stats(void *opaque)
{
    VirtIOGPU *g = opaque;

    if (g->stats.requests) {
        fprintf(stderr, "stats: vq req %4d, %3d -- 3D %4d (%5d)\n",
                g->stats.requests,
                g->stats.max_inflight,
                g->stats.req_3d,
                g->stats.bytes_3d);
        g->stats.requests     = 0;
        g->stats.max_inflight = 0;
        g->stats.req_3d       = 0;
        g->stats.bytes_3d     = 0;
    } else {
        fprintf(stderr, "stats: idle\r");
    }
    timer_mod(g->print_stats, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 1000);
}

static void virtio_gpu_fence_poll(void *opaque)
{
    VirtIOGPU *g = opaque;

    virgl_renderer_poll();
    virtio_gpu_process_cmdq(g);
    if (!QTAILQ_EMPTY(&g->cmdq) || !QTAILQ_EMPTY(&g->fenceq)) {
        timer_mod(g->fence_poll, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 10);
    }
}

void virtio_gpu_virgl_fence_poll(VirtIOGPU *g)
{
    virtio_gpu_fence_poll(g);
}

void virtio_gpu_virgl_reset(VirtIOGPU *g)
{
    int i;

    /* virgl_renderer_reset() ??? */
    for (i = 0; i < g->conf.max_outputs; i++) {
        if (i != 0) {
            dpy_gfx_replace_surface(g->scanout[i].con, NULL);
        }
        dpy_gl_scanout_disable(g->scanout[i].con);
    }
}

void virtio_gpu_gl_block(void *opaque, bool block)
{
    VirtIOGPU *g = opaque;

    if (block) {
        g->renderer_blocked++;
    } else {
        g->renderer_blocked--;
    }
    assert(g->renderer_blocked >= 0);

    if (g->renderer_blocked == 0) {
        virtio_gpu_process_cmdq(g);
    }
}

int virtio_gpu_virgl_init(VirtIOGPU *g)
{
    int ret;

    ret = virgl_renderer_init(g, 0, &virtio_gpu_3d_cbs);
    if (ret != 0) {
        return ret;
    }

    g->fence_poll = timer_new_ms(QEMU_CLOCK_VIRTUAL,
                                 virtio_gpu_fence_poll, g);

    if (virtio_gpu_stats_enabled(g->conf)) {
        g->print_stats = timer_new_ms(QEMU_CLOCK_VIRTUAL,
                                      virtio_gpu_print_stats, g);
        timer_mod(g->print_stats, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 1000);
    }
    return 0;
}

#endif /* CONFIG_VIRGL */
