/*
 * Copyright 2017 Valve Corporation
 *
 * 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.
 *
 * Authors: Andres Rodriguez <andresx7@gmail.com>
 */

#include <linux/file.h>
#include <linux/pid.h>

#include <drm/amdgpu_drm.h>

#include "amdgpu.h"
#include "amdgpu_sched.h"
#include "amdgpu_vm.h"

static int amdgpu_sched_process_priority_override(struct amdgpu_device *adev,
                                                  int fd,
                                                  int32_t priority)
{
        CLASS(fd, f)(fd);
        struct amdgpu_fpriv *fpriv;
        struct amdgpu_ctx_mgr *mgr;
        struct amdgpu_ctx *ctx;
        uint32_t id;
        int r;

        if (fd_empty(f))
                return -EINVAL;

        r = amdgpu_file_to_fpriv(fd_file(f), &fpriv);
        if (r)
                return r;

        mgr = &fpriv->ctx_mgr;
        mutex_lock(&mgr->lock);
        idr_for_each_entry(&mgr->ctx_handles, ctx, id)
                amdgpu_ctx_priority_override(ctx, priority);
        mutex_unlock(&mgr->lock);

        return 0;
}

static int amdgpu_sched_context_priority_override(struct amdgpu_device *adev,
                                                  int fd,
                                                  unsigned ctx_id,
                                                  int32_t priority)
{
        CLASS(fd, f)(fd);
        struct amdgpu_fpriv *fpriv;
        struct amdgpu_ctx *ctx;
        int r;

        if (fd_empty(f))
                return -EINVAL;

        r = amdgpu_file_to_fpriv(fd_file(f), &fpriv);
        if (r)
                return r;

        ctx = amdgpu_ctx_get(fpriv, ctx_id);

        if (!ctx)
                return -EINVAL;

        amdgpu_ctx_priority_override(ctx, priority);
        amdgpu_ctx_put(ctx);
        return 0;
}

int amdgpu_sched_ioctl(struct drm_device *dev, void *data,
                       struct drm_file *filp)
{
        union drm_amdgpu_sched *args = data;
        struct amdgpu_device *adev = drm_to_adev(dev);
        int r;

        /* First check the op, then the op's argument.
         */
        switch (args->in.op) {
        case AMDGPU_SCHED_OP_PROCESS_PRIORITY_OVERRIDE:
        case AMDGPU_SCHED_OP_CONTEXT_PRIORITY_OVERRIDE:
                break;
        default:
                DRM_ERROR("Invalid sched op specified: %d\n", args->in.op);
                return -EINVAL;
        }

        if (!amdgpu_ctx_priority_is_valid(args->in.priority)) {
                WARN(1, "Invalid context priority %d\n", args->in.priority);
                return -EINVAL;
        }

        switch (args->in.op) {
        case AMDGPU_SCHED_OP_PROCESS_PRIORITY_OVERRIDE:
                r = amdgpu_sched_process_priority_override(adev,
                                                           args->in.fd,
                                                           args->in.priority);
                break;
        case AMDGPU_SCHED_OP_CONTEXT_PRIORITY_OVERRIDE:
                r = amdgpu_sched_context_priority_override(adev,
                                                           args->in.fd,
                                                           args->in.ctx_id,
                                                           args->in.priority);
                break;
        default:
                /* Impossible.
                 */
                r = -EINVAL;
                break;
        }

        return r;
}