f97decac5f
Add the infrastructure to support the idea of multiple ringbuffers. Assign each ringbuffer an id and use that as an index for the various ring specific operations. The biggest delta is to support legacy fences. Each fence gets its own sequence number but the legacy functions expect to use a unique integer. To handle this we return a unique identifier for each submission but map it to a specific ring/sequence under the covers. Newer users use a dma_fence pointer anyway so they don't care about the actual sequence ID or ring. The actual mechanics for multiple ringbuffers are very target specific so this code just allows for the possibility but still only defines one ringbuffer for each target family. Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org> Signed-off-by: Rob Clark <robdclark@gmail.com>
153 lines
3.1 KiB
C
153 lines
3.1 KiB
C
/* Copyright (c) 2017 The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/kref.h>
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#include "msm_gpu.h"
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void msm_submitqueue_destroy(struct kref *kref)
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{
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struct msm_gpu_submitqueue *queue = container_of(kref,
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struct msm_gpu_submitqueue, ref);
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kfree(queue);
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}
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struct msm_gpu_submitqueue *msm_submitqueue_get(struct msm_file_private *ctx,
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u32 id)
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{
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struct msm_gpu_submitqueue *entry;
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if (!ctx)
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return NULL;
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read_lock(&ctx->queuelock);
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list_for_each_entry(entry, &ctx->submitqueues, node) {
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if (entry->id == id) {
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kref_get(&entry->ref);
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read_unlock(&ctx->queuelock);
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return entry;
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}
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}
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read_unlock(&ctx->queuelock);
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return NULL;
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}
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void msm_submitqueue_close(struct msm_file_private *ctx)
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{
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struct msm_gpu_submitqueue *entry, *tmp;
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if (!ctx)
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return;
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/*
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* No lock needed in close and there won't
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* be any more user ioctls coming our way
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*/
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list_for_each_entry_safe(entry, tmp, &ctx->submitqueues, node)
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msm_submitqueue_put(entry);
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}
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int msm_submitqueue_create(struct drm_device *drm, struct msm_file_private *ctx,
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u32 prio, u32 flags, u32 *id)
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{
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struct msm_drm_private *priv = drm->dev_private;
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struct msm_gpu_submitqueue *queue;
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if (!ctx)
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return -ENODEV;
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queue = kzalloc(sizeof(*queue), GFP_KERNEL);
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if (!queue)
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return -ENOMEM;
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kref_init(&queue->ref);
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queue->flags = flags;
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if (priv->gpu) {
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if (prio >= priv->gpu->nr_rings)
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return -EINVAL;
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queue->prio = prio;
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}
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write_lock(&ctx->queuelock);
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queue->id = ctx->queueid++;
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if (id)
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*id = queue->id;
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list_add_tail(&queue->node, &ctx->submitqueues);
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write_unlock(&ctx->queuelock);
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return 0;
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}
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int msm_submitqueue_init(struct drm_device *drm, struct msm_file_private *ctx)
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{
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struct msm_drm_private *priv = drm->dev_private;
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int default_prio;
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if (!ctx)
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return 0;
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/*
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* Select priority 2 as the "default priority" unless nr_rings is less
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* than 2 and then pick the lowest pirority
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*/
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default_prio = priv->gpu ?
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clamp_t(uint32_t, 2, 0, priv->gpu->nr_rings - 1) : 0;
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INIT_LIST_HEAD(&ctx->submitqueues);
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rwlock_init(&ctx->queuelock);
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return msm_submitqueue_create(drm, ctx, default_prio, 0, NULL);
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}
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int msm_submitqueue_remove(struct msm_file_private *ctx, u32 id)
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{
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struct msm_gpu_submitqueue *entry;
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if (!ctx)
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return 0;
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/*
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* id 0 is the "default" queue and can't be destroyed
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* by the user
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*/
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if (!id)
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return -ENOENT;
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write_lock(&ctx->queuelock);
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list_for_each_entry(entry, &ctx->submitqueues, node) {
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if (entry->id == id) {
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list_del(&entry->node);
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write_unlock(&ctx->queuelock);
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msm_submitqueue_put(entry);
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return 0;
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}
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}
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write_unlock(&ctx->queuelock);
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return -ENOENT;
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}
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