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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2017 The Linux Foundation. All rights reserved.
*/
#include <linux/kref.h>
#include <linux/uaccess.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);
idr_destroy(&queue->fence_idr);
drm_sched_entity_destroy(&queue->entity);
msm_file_private_put(queue->ctx);
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) {
list_del(&entry->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;
struct msm_ringbuffer *ring;
struct drm_gpu_scheduler *sched;
enum drm_sched_priority sched_prio;
unsigned ring_nr;
int ret;
if (!ctx)
return -ENODEV;
if (!priv->gpu)
return -ENODEV;
ret = msm_gpu_convert_priority(priv->gpu, prio, &ring_nr, &sched_prio);
if (ret)
return ret;
queue = kzalloc(sizeof(*queue), GFP_KERNEL);
if (!queue)
return -ENOMEM;
kref_init(&queue->ref);
queue->flags = flags;
queue->ring_nr = ring_nr;
ring = priv->gpu->rb[ring_nr];
sched = &ring->sched;
ret = drm_sched_entity_init(&queue->entity,
sched_prio, &sched, 1, NULL);
if (ret) {
kfree(queue);
return ret;
}
write_lock(&ctx->queuelock);
queue->ctx = msm_file_private_get(ctx);
queue->id = ctx->queueid++;
if (id)
*id = queue->id;
idr_init(&queue->fence_idr);
mutex_init(&queue->lock);
list_add_tail(&queue->node, &ctx->submitqueues);
write_unlock(&ctx->queuelock);
return 0;
}
/*
* Create the default submit-queue (id==0), used for backwards compatibility
* for userspace that pre-dates the introduction of submitqueues.
*/
int msm_submitqueue_init(struct drm_device *drm, struct msm_file_private *ctx)
{
struct msm_drm_private *priv = drm->dev_private;
int default_prio, max_priority;
if (!priv->gpu)
return -ENODEV;
max_priority = (priv->gpu->nr_rings * NR_SCHED_PRIORITIES) - 1;
/*
* Pick a medium priority level as default. Lower numeric value is
* higher priority, so round-up to pick a priority that is not higher
* than the middle priority level.
*/
default_prio = DIV_ROUND_UP(max_priority, 2);
INIT_LIST_HEAD(&ctx->submitqueues);
rwlock_init(&ctx->queuelock);
return msm_submitqueue_create(drm, ctx, default_prio, 0, NULL);
}
static int msm_submitqueue_query_faults(struct msm_gpu_submitqueue *queue,
struct drm_msm_submitqueue_query *args)
{
size_t size = min_t(size_t, args->len, sizeof(queue->faults));
int ret;
/* If a zero length was passed in, return the data size we expect */
if (!args->len) {
args->len = sizeof(queue->faults);
return 0;
}
/* Set the length to the actual size of the data */
args->len = size;
ret = copy_to_user(u64_to_user_ptr(args->data), &queue->faults, size);
return ret ? -EFAULT : 0;
}
int msm_submitqueue_query(struct drm_device *drm, struct msm_file_private *ctx,
struct drm_msm_submitqueue_query *args)
{
struct msm_gpu_submitqueue *queue;
int ret = -EINVAL;
if (args->pad)
return -EINVAL;
queue = msm_submitqueue_get(ctx, args->id);
if (!queue)
return -ENOENT;
if (args->param == MSM_SUBMITQUEUE_PARAM_FAULTS)
ret = msm_submitqueue_query_faults(queue, args);
msm_submitqueue_put(queue);
return ret;
}
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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