/*
 * © Copyright 2019 Collabora, Ltd.
 * Copyright 2019 Alyssa Rosenzweig
 *
 * 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.
 *
 */

#include <fcntl.h>
#include <xf86drm.h>

#include "drm-uapi/panfrost_drm.h"

#include "util/u_memory.h"
#include "util/os_time.h"
#include "os/os_mman.h"

#include "pan_screen.h"
#include "pan_resource.h"
#include "pan_context.h"
#include "pan_util.h"
#include "pandecode/decode.h"

void
panfrost_drm_mmap_bo(struct panfrost_screen *screen, struct panfrost_bo *bo)
{
        struct drm_panfrost_mmap_bo mmap_bo = { .handle = bo->gem_handle };
        int ret;

        if (bo->cpu)
                return;

        ret = drmIoctl(screen->fd, DRM_IOCTL_PANFROST_MMAP_BO, &mmap_bo);
        if (ret) {
                fprintf(stderr, "DRM_IOCTL_PANFROST_MMAP_BO failed: %d\n", ret);
                assert(0);
        }

        bo->cpu = os_mmap(NULL, bo->size, PROT_READ | PROT_WRITE, MAP_SHARED,
                          screen->fd, mmap_bo.offset);
        if (bo->cpu == MAP_FAILED) {
                fprintf(stderr, "mmap failed: %p\n", bo->cpu);
                assert(0);
        }

        /* Record the mmap if we're tracing */
        if (pan_debug & PAN_DBG_TRACE)
                pandecode_inject_mmap(bo->gpu, bo->cpu, bo->size, NULL);
}

static void
panfrost_drm_munmap_bo(struct panfrost_screen *screen, struct panfrost_bo *bo)
{
        if (!bo->cpu)
                return;

        if (os_munmap((void *) (uintptr_t)bo->cpu, bo->size)) {
                perror("munmap");
                abort();
        }

        bo->cpu = NULL;
}

struct panfrost_bo *
panfrost_drm_create_bo(struct panfrost_screen *screen, size_t size,
                       uint32_t flags)
{
        struct panfrost_bo *bo;

        /* Kernel will fail (confusingly) with EPERM otherwise */
        assert(size > 0);

        unsigned translated_flags = 0;

        /* TODO: translate flags to kernel flags, if the kernel supports */

        struct drm_panfrost_create_bo create_bo = {
                .size = size,
                .flags = translated_flags,
        };

        /* Before creating a BO, we first want to check the cache */

        bo = panfrost_bo_cache_fetch(screen, size, flags);

        if (bo == NULL) {
                /* Otherwise, the cache misses and we need to allocate a BO fresh from
                 * the kernel */

                int ret;

                ret = drmIoctl(screen->fd, DRM_IOCTL_PANFROST_CREATE_BO, &create_bo);
                if (ret) {
                        fprintf(stderr, "DRM_IOCTL_PANFROST_CREATE_BO failed: %d\n", ret);
                        assert(0);
                }

                /* We have a BO allocated from the kernel; fill in the userspace
                 * version */

                bo = rzalloc(screen, struct panfrost_bo);
                bo->size = create_bo.size;
                bo->gpu = create_bo.offset;
                bo->gem_handle = create_bo.handle;
        }

        /* Only mmap now if we know we need to. For CPU-invisible buffers, we
         * never map since we don't care about their contents; they're purely
         * for GPU-internal use. */

        if (!(flags & (PAN_ALLOCATE_INVISIBLE | PAN_ALLOCATE_DELAY_MMAP)))
                panfrost_drm_mmap_bo(screen, bo);

        pipe_reference_init(&bo->reference, 1);
        return bo;
}

void
panfrost_drm_release_bo(struct panfrost_screen *screen, struct panfrost_bo *bo, bool cacheable)
{
        struct drm_gem_close gem_close = { .handle = bo->gem_handle };
        int ret;

        if (!bo)
                return;

        /* Rather than freeing the BO now, we'll cache the BO for later
         * allocations if we're allowed to */

        if (cacheable) {
                bool cached = panfrost_bo_cache_put(screen, bo);

                if (cached)
                        return;
        }

        /* Otherwise, if the BO wasn't cached, we'll legitimately free the BO */

        panfrost_drm_munmap_bo(screen, bo);

        ret = drmIoctl(screen->fd, DRM_IOCTL_GEM_CLOSE, &gem_close);
        if (ret) {
                fprintf(stderr, "DRM_IOCTL_GEM_CLOSE failed: %d\n", ret);
                assert(0);
        }

        ralloc_free(bo);
}

void
panfrost_drm_allocate_slab(struct panfrost_screen *screen,
                           struct panfrost_memory *mem,
                           size_t pages,
                           bool same_va,
                           int extra_flags,
                           int commit_count,
                           int extent)
{
        // TODO cache allocations
        // TODO properly handle errors
        // TODO take into account extra_flags
        mem->bo = panfrost_drm_create_bo(screen, pages * 4096, extra_flags);
        mem->stack_bottom = 0;
}

void
panfrost_drm_free_slab(struct panfrost_screen *screen, struct panfrost_memory *mem)
{
        panfrost_bo_unreference(&screen->base, mem->bo);
        mem->bo = NULL;
}

struct panfrost_bo *
panfrost_drm_import_bo(struct panfrost_screen *screen, int fd)
{
        struct panfrost_bo *bo = rzalloc(screen, struct panfrost_bo);
        struct drm_panfrost_get_bo_offset get_bo_offset = {0,};
        MAYBE_UNUSED int ret;
        unsigned gem_handle;

        ret = drmPrimeFDToHandle(screen->fd, fd, &gem_handle);
        assert(!ret);

        get_bo_offset.handle = gem_handle;
        ret = drmIoctl(screen->fd, DRM_IOCTL_PANFROST_GET_BO_OFFSET, &get_bo_offset);
        assert(!ret);

        bo->gem_handle = gem_handle;
        bo->gpu = (mali_ptr) get_bo_offset.offset;
        bo->size = lseek(fd, 0, SEEK_END);
        assert(bo->size > 0);
        pipe_reference_init(&bo->reference, 1);

        // TODO map and unmap on demand?
        panfrost_drm_mmap_bo(screen, bo);
        return bo;
}

int
panfrost_drm_export_bo(struct panfrost_screen *screen, const struct panfrost_bo *bo)
{
        struct drm_prime_handle args = {
                .handle = bo->gem_handle,
                .flags = DRM_CLOEXEC,
        };

        int ret = drmIoctl(screen->fd, DRM_IOCTL_PRIME_HANDLE_TO_FD, &args);
        if (ret == -1)
                return -1;

        return args.fd;
}

static int
panfrost_drm_submit_job(struct panfrost_context *ctx, u64 job_desc, int reqs)
{
        struct pipe_context *gallium = (struct pipe_context *) ctx;
        struct panfrost_screen *screen = pan_screen(gallium->screen);
        struct panfrost_job *job = panfrost_get_job_for_fbo(ctx);
        struct drm_panfrost_submit submit = {0,};
        int *bo_handles, ret;

        submit.in_syncs = (u64) (uintptr_t) &ctx->out_sync;
        submit.in_sync_count = 1;

        submit.out_sync = ctx->out_sync;

        submit.jc = job_desc;
        submit.requirements = reqs;

        bo_handles = calloc(job->bos->entries, sizeof(*bo_handles));
        assert(bo_handles);

        set_foreach(job->bos, entry) {
                struct panfrost_bo *bo = (struct panfrost_bo *)entry->key;
                assert(bo->gem_handle > 0);
                bo_handles[submit.bo_handle_count++] = bo->gem_handle;
        }

        submit.bo_handles = (u64) (uintptr_t) bo_handles;
        ret = drmIoctl(screen->fd, DRM_IOCTL_PANFROST_SUBMIT, &submit);
        free(bo_handles);
        if (ret) {
                fprintf(stderr, "Error submitting: %m\n");
                return errno;
        }

        /* Trace the job if we're doing that */
        if (pan_debug & PAN_DBG_TRACE) {
                /* Wait so we can get errors reported back */
                drmSyncobjWait(screen->fd, &ctx->out_sync, 1, INT64_MAX, 0, NULL);
                pandecode_jc(submit.jc, FALSE);
        }

        return 0;
}

int
panfrost_drm_submit_vs_fs_job(struct panfrost_context *ctx, bool has_draws, bool is_scanout)
{
        int ret = 0;

        struct panfrost_job *job = panfrost_get_job_for_fbo(ctx);

        /* TODO: Add here the transient pools */
        panfrost_job_add_bo(job, ctx->shaders.bo);
        panfrost_job_add_bo(job, ctx->scratchpad.bo);
        panfrost_job_add_bo(job, ctx->tiler_heap.bo);
        panfrost_job_add_bo(job, ctx->tiler_polygon_list.bo);

        if (job->first_job.gpu) {
                ret = panfrost_drm_submit_job(ctx, job->first_job.gpu, 0);
                assert(!ret);
        }

        if (job->first_tiler.gpu || job->clear) {
                ret = panfrost_drm_submit_job(ctx, panfrost_fragment_job(ctx, has_draws), PANFROST_JD_REQ_FS);
                assert(!ret);
        }

        return ret;
}

static struct panfrost_fence *
panfrost_fence_create(struct panfrost_context *ctx)
{
        struct pipe_context *gallium = (struct pipe_context *) ctx;
        struct panfrost_screen *screen = pan_screen(gallium->screen);
        struct panfrost_fence *f = calloc(1, sizeof(*f));
        if (!f)
                return NULL;

        /* Snapshot the last Panfrost's rendering's out fence.  We'd rather have
         * another syncobj instead of a sync file, but this is all we get.
         * (HandleToFD/FDToHandle just gives you another syncobj ID for the
         * same syncobj).
         */
        drmSyncobjExportSyncFile(screen->fd, ctx->out_sync, &f->fd);
        if (f->fd == -1) {
                fprintf(stderr, "export failed\n");
                free(f);
                return NULL;
        }

        pipe_reference_init(&f->reference, 1);

        return f;
}

void
panfrost_drm_force_flush_fragment(struct panfrost_context *ctx,
                                  struct pipe_fence_handle **fence)
{
        struct pipe_context *gallium = (struct pipe_context *) ctx;
        struct panfrost_screen *screen = pan_screen(gallium->screen);

        if (!screen->last_fragment_flushed) {
                drmSyncobjWait(screen->fd, &ctx->out_sync, 1, INT64_MAX, 0, NULL);
                screen->last_fragment_flushed = true;

                /* The job finished up, so we're safe to clean it up now */
                panfrost_free_job(ctx, screen->last_job);
        }

        if (fence) {
                struct panfrost_fence *f = panfrost_fence_create(ctx);
                gallium->screen->fence_reference(gallium->screen, fence, NULL);
                *fence = (struct pipe_fence_handle *)f;
        }
}

unsigned
panfrost_drm_query_gpu_version(struct panfrost_screen *screen)
{
        struct drm_panfrost_get_param get_param = {0,};
        MAYBE_UNUSED int ret;

        get_param.param = DRM_PANFROST_PARAM_GPU_PROD_ID;
        ret = drmIoctl(screen->fd, DRM_IOCTL_PANFROST_GET_PARAM, &get_param);
        assert(!ret);

        return get_param.value;
}

int
panfrost_drm_init_context(struct panfrost_context *ctx)
{
        struct pipe_context *gallium = (struct pipe_context *) ctx;
        struct panfrost_screen *screen = pan_screen(gallium->screen);

        return drmSyncobjCreate(screen->fd, DRM_SYNCOBJ_CREATE_SIGNALED,
                                &ctx->out_sync);
}

void
panfrost_drm_fence_reference(struct pipe_screen *screen,
                             struct pipe_fence_handle **ptr,
                             struct pipe_fence_handle *fence)
{
        struct panfrost_fence **p = (struct panfrost_fence **)ptr;
        struct panfrost_fence *f = (struct panfrost_fence *)fence;
        struct panfrost_fence *old = *p;

        if (pipe_reference(&(*p)->reference, &f->reference)) {
                close(old->fd);
                free(old);
        }
        *p = f;
}

boolean
panfrost_drm_fence_finish(struct pipe_screen *pscreen,
                          struct pipe_context *ctx,
                          struct pipe_fence_handle *fence,
                          uint64_t timeout)
{
        struct panfrost_screen *screen = pan_screen(pscreen);
        struct panfrost_fence *f = (struct panfrost_fence *)fence;
        int ret;

        unsigned syncobj;
        ret = drmSyncobjCreate(screen->fd, 0, &syncobj);
        if (ret) {
                fprintf(stderr, "Failed to create syncobj to wait on: %m\n");
                return false;
        }

        drmSyncobjImportSyncFile(screen->fd, syncobj, f->fd);
        if (ret) {
                fprintf(stderr, "Failed to import fence to syncobj: %m\n");
                return false;
        }

        uint64_t abs_timeout = os_time_get_absolute_timeout(timeout);
        if (abs_timeout == OS_TIMEOUT_INFINITE)
                abs_timeout = INT64_MAX;

        ret = drmSyncobjWait(screen->fd, &syncobj, 1, abs_timeout, 0, NULL);

        drmSyncobjDestroy(screen->fd, syncobj);

        return ret >= 0;
}