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/* Copyright (c) 2017 The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/kref.h>
#include "msm_gpu.h"
void msm_submitqueue_destroy(struct kref *kref)
{
struct msm_gpu_submitqueue *queue = container_of(kref,
struct msm_gpu_submitqueue, ref);
kfree(queue);
}
struct msm_gpu_submitqueue *msm_submitqueue_get(struct msm_file_private *ctx,
u32 id)
{
struct msm_gpu_submitqueue *entry;
if (!ctx)
return NULL;
read_lock(&ctx->queuelock);
list_for_each_entry(entry, &ctx->submitqueues, node) {
if (entry->id == id) {
kref_get(&entry->ref);
read_unlock(&ctx->queuelock);
return entry;
}
}
read_unlock(&ctx->queuelock);
return NULL;
}
void msm_submitqueue_close(struct msm_file_private *ctx)
{
struct msm_gpu_submitqueue *entry, *tmp;
if (!ctx)
return;
/*
* No lock needed in close and there won't
* be any more user ioctls coming our way
*/
list_for_each_entry_safe(entry, tmp, &ctx->submitqueues, node)
msm_submitqueue_put(entry);
}
int msm_submitqueue_create(struct drm_device *drm, struct msm_file_private *ctx,
u32 prio, u32 flags, u32 *id)
{
struct msm_drm_private *priv = drm->dev_private;
struct msm_gpu_submitqueue *queue;
if (!ctx)
return -ENODEV;
queue = kzalloc(sizeof(*queue), GFP_KERNEL);
if (!queue)
return -ENOMEM;
kref_init(&queue->ref);
queue->flags = flags;
if (priv->gpu) {
if (prio >= priv->gpu->nr_rings)
return -EINVAL;
queue->prio = prio;
}
write_lock(&ctx->queuelock);
queue->id = ctx->queueid++;
if (id)
*id = queue->id;
list_add_tail(&queue->node, &ctx->submitqueues);
write_unlock(&ctx->queuelock);
return 0;
}
int msm_submitqueue_init(struct drm_device *drm, struct msm_file_private *ctx)
{
struct msm_drm_private *priv = drm->dev_private;
int default_prio;
if (!ctx)
return 0;
/*
* Select priority 2 as the "default priority" unless nr_rings is less
* than 2 and then pick the lowest pirority
*/
default_prio = priv->gpu ?
clamp_t(uint32_t, 2, 0, priv->gpu->nr_rings - 1) : 0;
INIT_LIST_HEAD(&ctx->submitqueues);
rwlock_init(&ctx->queuelock);
return msm_submitqueue_create(drm, ctx, default_prio, 0, NULL);
}
int msm_submitqueue_remove(struct msm_file_private *ctx, u32 id)
{
struct msm_gpu_submitqueue *entry;
if (!ctx)
return 0;
/*
* id 0 is the "default" queue and can't be destroyed
* by the user
*/
if (!id)
return -ENOENT;
write_lock(&ctx->queuelock);
list_for_each_entry(entry, &ctx->submitqueues, node) {
if (entry->id == id) {
list_del(&entry->node);
write_unlock(&ctx->queuelock);
msm_submitqueue_put(entry);
return 0;
}
}
write_unlock(&ctx->queuelock);
return -ENOENT;
}
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