/*
 * Copyright © 2021 Raspberry Pi Ltd
 *
 * 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 (including the next
 * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.
 */

/**
 * Gallium query object support for performance counters
 *
 * This contains the performance V3D counters queries.
 */

#include "v3d_query.h"

#include "common/v3d_performance_counters.h"

struct v3d_query_perfcnt
{
        struct v3d_query base;

        unsigned num_queries;
        struct v3d_perfmon_state *perfmon;
};

static void
kperfmon_destroy(struct v3d_context *v3d, struct v3d_perfmon_state *perfmon)
{
        struct drm_v3d_perfmon_destroy destroyreq;

        destroyreq.id = perfmon->kperfmon_id;
        int ret = v3d_ioctl(v3d->fd, DRM_IOCTL_V3D_PERFMON_DESTROY, &destroyreq);
        if (ret != 0)
                fprintf(stderr, "failed to destroy perfmon %d: %s\n",
                        perfmon->kperfmon_id, strerror(errno));
}

int
v3dX(get_driver_query_group_info_perfcnt)(struct v3d_screen *screen, unsigned index,
                                          struct pipe_driver_query_group_info *info)
{
        struct v3d_device_info *devinfo = &screen->devinfo;

        if (!screen->has_perfmon)
                return 0;

        if (!info)
                return 1;

        if (index > 0)
                return 0;

        info->name = "V3D counters";
        info->max_active_queries = DRM_V3D_MAX_PERF_COUNTERS;
        info->num_queries = devinfo->max_perfcnt ? devinfo->max_perfcnt
                                                 : ARRAY_SIZE(v3d_performance_counters);

        return 1;
}

int
v3dX(get_driver_query_info_perfcnt)(struct v3d_screen *screen, unsigned index,
                                    struct pipe_driver_query_info *info)
{
        struct v3d_device_info *devinfo = &screen->devinfo;
        unsigned max_perfcnt = devinfo->max_perfcnt ? devinfo->max_perfcnt
                                                    : ARRAY_SIZE(v3d_performance_counters);

        if (!screen->has_perfmon)
                return 0;

        if (!info)
                return max_perfcnt;

        if (index >= max_perfcnt)
                return 0;

        if (screen->perfcnt_names[index]) {
                info->name = screen->perfcnt_names[index];
        } else if (devinfo->max_perfcnt) {
                struct drm_v3d_perfmon_get_counter counter = {
                        .counter = index,
                };
                int ret = v3d_ioctl(screen->fd, DRM_IOCTL_V3D_PERFMON_GET_COUNTER, &counter);
                if (ret != 0) {
                        fprintf(stderr, "Failed to get performance counter %d: %s\n",
                                index, strerror(errno));
                        return 0;
                }

                screen->perfcnt_names[index] = ralloc_strdup(screen->perfcnt_names,
                                                             (const char *) counter.name);
                info->name = screen->perfcnt_names[index];
        } else {
                info->name = v3d_performance_counters[index][V3D_PERFCNT_NAME];
        }

        info->group_id = 0;
        info->query_type = PIPE_QUERY_DRIVER_SPECIFIC + index;
        info->result_type = PIPE_DRIVER_QUERY_RESULT_TYPE_CUMULATIVE;
        info->type = PIPE_DRIVER_QUERY_TYPE_UINT64;
        info->flags = PIPE_DRIVER_QUERY_FLAG_BATCH;

        return 1;
}

static void
v3d_destroy_query_perfcnt(struct v3d_context *v3d, struct v3d_query *query)
{
        struct v3d_query_perfcnt *pquery = (struct v3d_query_perfcnt *)query;

        assert(pquery->perfmon);

        if (v3d->active_perfmon == pquery->perfmon) {
                fprintf(stderr, "Query is active; end query before destroying\n");
                return;
        }
        if (pquery->perfmon->kperfmon_id)
                kperfmon_destroy(v3d, pquery->perfmon);

        v3d_fence_unreference(&pquery->perfmon->last_job_fence);
        free(pquery->perfmon);
        free(query);
}

static bool
v3d_begin_query_perfcnt(struct v3d_context *v3d, struct v3d_query *query)
{
        struct v3d_query_perfcnt *pquery = (struct v3d_query_perfcnt *)query;
        struct drm_v3d_perfmon_create createreq = { 0 };
        int i, ret;

        /* Only one perfmon can be activated per context */
        if (v3d->active_perfmon) {
                fprintf(stderr,
                        "Another query is already active; "
                        "finish it before starting a new one\n");
                return false;
        }

        assert(pquery->perfmon);

        /* Reset the counters by destroying the previously allocated perfmon */
        if (pquery->perfmon->kperfmon_id)
                kperfmon_destroy(v3d, pquery->perfmon);

        for (i = 0; i < pquery->num_queries; i++)
                createreq.counters[i] = pquery->perfmon->counters[i];

        createreq.ncounters = pquery->num_queries;
        ret = v3d_ioctl(v3d->fd, DRM_IOCTL_V3D_PERFMON_CREATE, &createreq);
        if (ret != 0)
                return false;

        pquery->perfmon->kperfmon_id = createreq.id;
        pquery->perfmon->job_submitted = false;
        v3d_fence_unreference(&pquery->perfmon->last_job_fence);

        /* Ensure all pending jobs are flushed before activating the
         * perfmon
         */
        v3d_flush((struct pipe_context *)v3d);
        v3d->active_perfmon = pquery->perfmon;

        return true;
}

static bool
v3d_end_query_perfcnt(struct v3d_context *v3d, struct v3d_query *query)
{
        struct v3d_query_perfcnt *pquery = (struct v3d_query_perfcnt *)query;

        assert(pquery->perfmon);

        if (v3d->active_perfmon != pquery->perfmon) {
                fprintf(stderr, "This query is not active\n");
                return false;
        }

        /* Ensure all pending jobs are flushed before deactivating the
         * perfmon
         */
        v3d_flush((struct pipe_context *)v3d);

        /* Get a copy of latest submitted job's fence to wait for its
         * completion
         */
        if (v3d->active_perfmon->job_submitted) {
                int fd = -1;
                drmSyncobjExportSyncFile(v3d->fd, v3d->out_sync, &fd);
                if (fd == -1) {
                        fprintf(stderr, "export failed\n");
                        v3d->active_perfmon->last_job_fence = NULL;
                } else {
                        v3d->active_perfmon->last_job_fence =
                                v3d_fence_create(v3d, fd);
                }
        }

        v3d->active_perfmon = NULL;

        return true;
}

static bool
v3d_get_query_result_perfcnt(struct v3d_context *v3d, struct v3d_query *query,
                             bool wait, union pipe_query_result *vresult)
{
        struct v3d_query_perfcnt *pquery = (struct v3d_query_perfcnt *)query;
        struct drm_v3d_perfmon_get_values req = { 0 };
        int i, ret;

        assert(pquery->perfmon);

        if (pquery->perfmon->job_submitted) {
                if (!v3d_fence_wait(v3d->screen,
                                    pquery->perfmon->last_job_fence,
                                    wait ? OS_TIMEOUT_INFINITE : 0))
                        return false;

                req.id = pquery->perfmon->kperfmon_id;
                req.values_ptr = (uintptr_t)pquery->perfmon->values;
                ret = v3d_ioctl(v3d->fd, DRM_IOCTL_V3D_PERFMON_GET_VALUES, &req);
                if (ret != 0) {
                        fprintf(stderr, "Can't request perfmon counters values\n");
                        return false;
                }
        }

        for (i = 0; i < pquery->num_queries; i++)
                vresult->batch[i].u64 = pquery->perfmon->values[i];

        return true;
}

static const struct v3d_query_funcs perfcnt_query_funcs = {
        .destroy_query = v3d_destroy_query_perfcnt,
        .begin_query = v3d_begin_query_perfcnt,
        .end_query = v3d_end_query_perfcnt,
        .get_query_result = v3d_get_query_result_perfcnt,
};

struct pipe_query *
v3dX(create_batch_query_perfcnt)(struct v3d_context *v3d, unsigned num_queries,
                                 unsigned *query_types)
{
        struct v3d_query_perfcnt *pquery = NULL;
        struct v3d_query *query;
        struct v3d_perfmon_state *perfmon = NULL;
        struct v3d_device_info *devinfo = &v3d->screen->devinfo;
        unsigned max_perfcnt = devinfo->max_perfcnt ? devinfo->max_perfcnt
                                                    : ARRAY_SIZE(v3d_performance_counters);
        int i;

        /* Validate queries */
        for (i = 0; i < num_queries; i++) {
                if (query_types[i] < PIPE_QUERY_DRIVER_SPECIFIC ||
                    query_types[i] >= PIPE_QUERY_DRIVER_SPECIFIC + max_perfcnt) {
                        fprintf(stderr, "Invalid query type\n");
                        return NULL;
                }
        }

        pquery = calloc(1, sizeof(*pquery));
        if (!pquery)
                return NULL;

        perfmon = calloc(1, sizeof(*perfmon));
        if (!perfmon) {
                free(pquery);
                return NULL;
        }

        for (i = 0; i < num_queries; i++)
                perfmon->counters[i] = query_types[i] - PIPE_QUERY_DRIVER_SPECIFIC;

        pquery->perfmon = perfmon;
        pquery->num_queries = num_queries;

        query = &pquery->base;
        query->funcs = &perfcnt_query_funcs;

        /* Note that struct pipe_query isn't actually defined anywhere. */
         return (struct pipe_query *)query;
}