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156 lines
3.8 KiB
156 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Tegra host1x Channel |
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* |
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* Copyright (c) 2010-2013, NVIDIA Corporation. |
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*/ |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include "channel.h" |
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#include "dev.h" |
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#include "job.h" |
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/* Constructor for the host1x device list */ |
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int host1x_channel_list_init(struct host1x_channel_list *chlist, |
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unsigned int num_channels) |
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{ |
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chlist->channels = kcalloc(num_channels, sizeof(struct host1x_channel), |
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GFP_KERNEL); |
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if (!chlist->channels) |
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return -ENOMEM; |
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chlist->allocated_channels = |
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kcalloc(BITS_TO_LONGS(num_channels), sizeof(unsigned long), |
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GFP_KERNEL); |
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if (!chlist->allocated_channels) { |
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kfree(chlist->channels); |
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return -ENOMEM; |
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} |
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bitmap_zero(chlist->allocated_channels, num_channels); |
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return 0; |
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} |
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void host1x_channel_list_free(struct host1x_channel_list *chlist) |
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{ |
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kfree(chlist->allocated_channels); |
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kfree(chlist->channels); |
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} |
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int host1x_job_submit(struct host1x_job *job) |
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{ |
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struct host1x *host = dev_get_drvdata(job->channel->dev->parent); |
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return host1x_hw_channel_submit(host, job); |
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} |
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EXPORT_SYMBOL(host1x_job_submit); |
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struct host1x_channel *host1x_channel_get(struct host1x_channel *channel) |
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{ |
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kref_get(&channel->refcount); |
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return channel; |
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} |
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EXPORT_SYMBOL(host1x_channel_get); |
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/** |
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* host1x_channel_get_index() - Attempt to get channel reference by index |
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* @host: Host1x device object |
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* @index: Index of channel |
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* |
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* If channel number @index is currently allocated, increase its refcount |
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* and return a pointer to it. Otherwise, return NULL. |
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*/ |
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struct host1x_channel *host1x_channel_get_index(struct host1x *host, |
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unsigned int index) |
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{ |
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struct host1x_channel *ch = &host->channel_list.channels[index]; |
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if (!kref_get_unless_zero(&ch->refcount)) |
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return NULL; |
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return ch; |
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} |
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static void release_channel(struct kref *kref) |
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{ |
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struct host1x_channel *channel = |
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container_of(kref, struct host1x_channel, refcount); |
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struct host1x *host = dev_get_drvdata(channel->dev->parent); |
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struct host1x_channel_list *chlist = &host->channel_list; |
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host1x_hw_cdma_stop(host, &channel->cdma); |
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host1x_cdma_deinit(&channel->cdma); |
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clear_bit(channel->id, chlist->allocated_channels); |
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} |
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void host1x_channel_put(struct host1x_channel *channel) |
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{ |
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kref_put(&channel->refcount, release_channel); |
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} |
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EXPORT_SYMBOL(host1x_channel_put); |
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static struct host1x_channel *acquire_unused_channel(struct host1x *host) |
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{ |
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struct host1x_channel_list *chlist = &host->channel_list; |
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unsigned int max_channels = host->info->nb_channels; |
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unsigned int index; |
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index = find_first_zero_bit(chlist->allocated_channels, max_channels); |
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if (index >= max_channels) { |
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dev_err(host->dev, "failed to find free channel\n"); |
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return NULL; |
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} |
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chlist->channels[index].id = index; |
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set_bit(index, chlist->allocated_channels); |
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return &chlist->channels[index]; |
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} |
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/** |
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* host1x_channel_request() - Allocate a channel |
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* @client: Host1x client this channel will be used to send commands to |
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* |
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* Allocates a new host1x channel for @client. May return NULL if CDMA |
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* initialization fails. |
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*/ |
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struct host1x_channel *host1x_channel_request(struct host1x_client *client) |
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{ |
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struct host1x *host = dev_get_drvdata(client->dev->parent); |
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struct host1x_channel_list *chlist = &host->channel_list; |
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struct host1x_channel *channel; |
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int err; |
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channel = acquire_unused_channel(host); |
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if (!channel) |
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return NULL; |
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kref_init(&channel->refcount); |
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mutex_init(&channel->submitlock); |
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channel->client = client; |
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channel->dev = client->dev; |
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err = host1x_hw_channel_init(host, channel, channel->id); |
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if (err < 0) |
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goto fail; |
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err = host1x_cdma_init(&channel->cdma); |
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if (err < 0) |
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goto fail; |
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return channel; |
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fail: |
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clear_bit(channel->id, chlist->allocated_channels); |
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dev_err(client->dev, "failed to initialize channel\n"); |
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return NULL; |
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} |
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EXPORT_SYMBOL(host1x_channel_request);
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