19952f691SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
26579324aSTerje Bergstrom /*
36579324aSTerje Bergstrom * Tegra host1x Channel
46579324aSTerje Bergstrom *
56579324aSTerje Bergstrom * Copyright (c) 2010-2013, NVIDIA Corporation.
66579324aSTerje Bergstrom */
76579324aSTerje Bergstrom
86579324aSTerje Bergstrom #include <linux/slab.h>
96579324aSTerje Bergstrom #include <linux/module.h>
106579324aSTerje Bergstrom
116579324aSTerje Bergstrom #include "channel.h"
126579324aSTerje Bergstrom #include "dev.h"
136579324aSTerje Bergstrom #include "job.h"
146579324aSTerje Bergstrom
156579324aSTerje Bergstrom /* Constructor for the host1x device list */
host1x_channel_list_init(struct host1x_channel_list * chlist,unsigned int num_channels)168474b025SMikko Perttunen int host1x_channel_list_init(struct host1x_channel_list *chlist,
178474b025SMikko Perttunen unsigned int num_channels)
186579324aSTerje Bergstrom {
198474b025SMikko Perttunen chlist->channels = kcalloc(num_channels, sizeof(struct host1x_channel),
208474b025SMikko Perttunen GFP_KERNEL);
218474b025SMikko Perttunen if (!chlist->channels)
228474b025SMikko Perttunen return -ENOMEM;
236579324aSTerje Bergstrom
24*2e1bfb31SChristophe JAILLET chlist->allocated_channels = bitmap_zalloc(num_channels, GFP_KERNEL);
258474b025SMikko Perttunen if (!chlist->allocated_channels) {
268474b025SMikko Perttunen kfree(chlist->channels);
278474b025SMikko Perttunen return -ENOMEM;
286579324aSTerje Bergstrom }
296579324aSTerje Bergstrom
306579324aSTerje Bergstrom return 0;
316579324aSTerje Bergstrom }
326579324aSTerje Bergstrom
host1x_channel_list_free(struct host1x_channel_list * chlist)338474b025SMikko Perttunen void host1x_channel_list_free(struct host1x_channel_list *chlist)
348474b025SMikko Perttunen {
35*2e1bfb31SChristophe JAILLET bitmap_free(chlist->allocated_channels);
368474b025SMikko Perttunen kfree(chlist->channels);
378474b025SMikko Perttunen }
388474b025SMikko Perttunen
host1x_job_submit(struct host1x_job * job)396579324aSTerje Bergstrom int host1x_job_submit(struct host1x_job *job)
406579324aSTerje Bergstrom {
416579324aSTerje Bergstrom struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
426579324aSTerje Bergstrom
436579324aSTerje Bergstrom return host1x_hw_channel_submit(host, job);
446579324aSTerje Bergstrom }
45fae798a1SThierry Reding EXPORT_SYMBOL(host1x_job_submit);
466579324aSTerje Bergstrom
host1x_channel_get(struct host1x_channel * channel)476579324aSTerje Bergstrom struct host1x_channel *host1x_channel_get(struct host1x_channel *channel)
486579324aSTerje Bergstrom {
498474b025SMikko Perttunen kref_get(&channel->refcount);
506579324aSTerje Bergstrom
518474b025SMikko Perttunen return channel;
526579324aSTerje Bergstrom }
53fae798a1SThierry Reding EXPORT_SYMBOL(host1x_channel_get);
546579324aSTerje Bergstrom
558474b025SMikko Perttunen /**
568474b025SMikko Perttunen * host1x_channel_get_index() - Attempt to get channel reference by index
578474b025SMikko Perttunen * @host: Host1x device object
588474b025SMikko Perttunen * @index: Index of channel
598474b025SMikko Perttunen *
608474b025SMikko Perttunen * If channel number @index is currently allocated, increase its refcount
618474b025SMikko Perttunen * and return a pointer to it. Otherwise, return NULL.
628474b025SMikko Perttunen */
host1x_channel_get_index(struct host1x * host,unsigned int index)638474b025SMikko Perttunen struct host1x_channel *host1x_channel_get_index(struct host1x *host,
648474b025SMikko Perttunen unsigned int index)
656579324aSTerje Bergstrom {
668474b025SMikko Perttunen struct host1x_channel *ch = &host->channel_list.channels[index];
676579324aSTerje Bergstrom
688474b025SMikko Perttunen if (!kref_get_unless_zero(&ch->refcount))
698474b025SMikko Perttunen return NULL;
708474b025SMikko Perttunen
718474b025SMikko Perttunen return ch;
728474b025SMikko Perttunen }
738474b025SMikko Perttunen
host1x_channel_stop(struct host1x_channel * channel)749ca790f4SDmitry Osipenko void host1x_channel_stop(struct host1x_channel *channel)
759ca790f4SDmitry Osipenko {
769ca790f4SDmitry Osipenko struct host1x *host = dev_get_drvdata(channel->dev->parent);
779ca790f4SDmitry Osipenko
789ca790f4SDmitry Osipenko host1x_hw_cdma_stop(host, &channel->cdma);
799ca790f4SDmitry Osipenko }
809ca790f4SDmitry Osipenko EXPORT_SYMBOL(host1x_channel_stop);
819ca790f4SDmitry Osipenko
release_channel(struct kref * kref)828474b025SMikko Perttunen static void release_channel(struct kref *kref)
838474b025SMikko Perttunen {
848474b025SMikko Perttunen struct host1x_channel *channel =
858474b025SMikko Perttunen container_of(kref, struct host1x_channel, refcount);
866579324aSTerje Bergstrom struct host1x *host = dev_get_drvdata(channel->dev->parent);
878474b025SMikko Perttunen struct host1x_channel_list *chlist = &host->channel_list;
886579324aSTerje Bergstrom
896579324aSTerje Bergstrom host1x_hw_cdma_stop(host, &channel->cdma);
906579324aSTerje Bergstrom host1x_cdma_deinit(&channel->cdma);
918474b025SMikko Perttunen
928474b025SMikko Perttunen clear_bit(channel->id, chlist->allocated_channels);
936579324aSTerje Bergstrom }
946579324aSTerje Bergstrom
host1x_channel_put(struct host1x_channel * channel)958474b025SMikko Perttunen void host1x_channel_put(struct host1x_channel *channel)
968474b025SMikko Perttunen {
978474b025SMikko Perttunen kref_put(&channel->refcount, release_channel);
986579324aSTerje Bergstrom }
99fae798a1SThierry Reding EXPORT_SYMBOL(host1x_channel_put);
1006579324aSTerje Bergstrom
acquire_unused_channel(struct host1x * host)1018474b025SMikko Perttunen static struct host1x_channel *acquire_unused_channel(struct host1x *host)
1028474b025SMikko Perttunen {
1038474b025SMikko Perttunen struct host1x_channel_list *chlist = &host->channel_list;
1048474b025SMikko Perttunen unsigned int max_channels = host->info->nb_channels;
1058474b025SMikko Perttunen unsigned int index;
1068474b025SMikko Perttunen
1078474b025SMikko Perttunen index = find_first_zero_bit(chlist->allocated_channels, max_channels);
1088474b025SMikko Perttunen if (index >= max_channels) {
1098474b025SMikko Perttunen dev_err(host->dev, "failed to find free channel\n");
1108474b025SMikko Perttunen return NULL;
1118474b025SMikko Perttunen }
1128474b025SMikko Perttunen
1138474b025SMikko Perttunen chlist->channels[index].id = index;
1148474b025SMikko Perttunen
1158474b025SMikko Perttunen set_bit(index, chlist->allocated_channels);
1168474b025SMikko Perttunen
1178474b025SMikko Perttunen return &chlist->channels[index];
1188474b025SMikko Perttunen }
1198474b025SMikko Perttunen
1208474b025SMikko Perttunen /**
1218474b025SMikko Perttunen * host1x_channel_request() - Allocate a channel
122caccddcfSThierry Reding * @client: Host1x client this channel will be used to send commands to
1238474b025SMikko Perttunen *
124caccddcfSThierry Reding * Allocates a new host1x channel for @client. May return NULL if CDMA
1258474b025SMikko Perttunen * initialization fails.
1268474b025SMikko Perttunen */
host1x_channel_request(struct host1x_client * client)127caccddcfSThierry Reding struct host1x_channel *host1x_channel_request(struct host1x_client *client)
1286579324aSTerje Bergstrom {
129caccddcfSThierry Reding struct host1x *host = dev_get_drvdata(client->dev->parent);
1308474b025SMikko Perttunen struct host1x_channel_list *chlist = &host->channel_list;
1318474b025SMikko Perttunen struct host1x_channel *channel;
132e18e33afSThierry Reding int err;
1336579324aSTerje Bergstrom
1348474b025SMikko Perttunen channel = acquire_unused_channel(host);
1356579324aSTerje Bergstrom if (!channel)
1368474b025SMikko Perttunen return NULL;
1376579324aSTerje Bergstrom
1388474b025SMikko Perttunen kref_init(&channel->refcount);
1398474b025SMikko Perttunen mutex_init(&channel->submitlock);
140caccddcfSThierry Reding channel->client = client;
141caccddcfSThierry Reding channel->dev = client->dev;
1428474b025SMikko Perttunen
1438474b025SMikko Perttunen err = host1x_hw_channel_init(host, channel, channel->id);
1446579324aSTerje Bergstrom if (err < 0)
1456579324aSTerje Bergstrom goto fail;
1466579324aSTerje Bergstrom
1478474b025SMikko Perttunen err = host1x_cdma_init(&channel->cdma);
1488474b025SMikko Perttunen if (err < 0)
1498474b025SMikko Perttunen goto fail;
1506579324aSTerje Bergstrom
1516579324aSTerje Bergstrom return channel;
1526579324aSTerje Bergstrom
1536579324aSTerje Bergstrom fail:
1548474b025SMikko Perttunen clear_bit(channel->id, chlist->allocated_channels);
1558474b025SMikko Perttunen
156caccddcfSThierry Reding dev_err(client->dev, "failed to initialize channel\n");
1578474b025SMikko Perttunen
1586579324aSTerje Bergstrom return NULL;
1596579324aSTerje Bergstrom }
160fae798a1SThierry Reding EXPORT_SYMBOL(host1x_channel_request);
161