gpu: host1x: Refactor channel allocation code

This is largely a rewrite of the Host1x channel allocation code, bringing
several changes:

- The previous code could deadlock due to an interaction
  between the 'reflock' mutex and CDMA timeout handling.
  This gets rid of the mutex.
- Support for more than 32 channels, required for Tegra186
- General refactoring, including better encapsulation
  of channel ownership handling into channel.c

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

10 files changed, 135 insertions, 110 deletions

diff --git a/drivers/gpu/drm/tegra/gr2d.c b/drivers/gpu/drm/tegra/gr2d.c
index fbe0b8b25b42..6ea070da7718 100644
--- a/drivers/gpu/drm/tegra/gr2d.c
+++ b/drivers/gpu/drm/tegra/gr2d.c
@@ -38,7 +38,7 @@ static int gr2d_init(struct host1x_client *client)
 
         client->syncpts[0] = host1x_syncpt_request(client->dev, flags);
         if (!client->syncpts[0]) {
-                host1x_channel_free(gr2d->channel);
+                host1x_channel_put(gr2d->channel);
                 return -ENOMEM;
         }
 
@@ -57,7 +57,7 @@ static int gr2d_exit(struct host1x_client *client)
                 return err;
 
         host1x_syncpt_free(client->syncpts[0]);
-        host1x_channel_free(gr2d->channel);
+        host1x_channel_put(gr2d->channel);
 
         return 0;
 }
diff --git a/drivers/gpu/drm/tegra/gr3d.c b/drivers/gpu/drm/tegra/gr3d.c
index 13f0d1b7cd98..cee2ab645cde 100644
--- a/drivers/gpu/drm/tegra/gr3d.c
+++ b/drivers/gpu/drm/tegra/gr3d.c
@@ -48,7 +48,7 @@ static int gr3d_init(struct host1x_client *client)
 
         client->syncpts[0] = host1x_syncpt_request(client->dev, flags);
         if (!client->syncpts[0]) {
-                host1x_channel_free(gr3d->channel);
+                host1x_channel_put(gr3d->channel);
                 return -ENOMEM;
         }
 
@@ -67,7 +67,7 @@ static int gr3d_exit(struct host1x_client *client)
                 return err;
 
         host1x_syncpt_free(client->syncpts[0]);
-        host1x_channel_free(gr3d->channel);
+        host1x_channel_put(gr3d->channel);
 
         return 0;
 }
diff --git a/drivers/gpu/drm/tegra/vic.c b/drivers/gpu/drm/tegra/vic.c
index cd804e404a11..47cb1aaa58b1 100644
--- a/drivers/gpu/drm/tegra/vic.c
+++ b/drivers/gpu/drm/tegra/vic.c
@@ -182,7 +182,7 @@ static int vic_init(struct host1x_client *client)
 free_syncpt:
         host1x_syncpt_free(client->syncpts[0]);
 free_channel:
-        host1x_channel_free(vic->channel);
+        host1x_channel_put(vic->channel);
 detach_device:
         if (tegra->domain)
                 iommu_detach_device(tegra->domain, vic->dev);
@@ -203,7 +203,7 @@ static int vic_exit(struct host1x_client *client)
                 return err;
 
         host1x_syncpt_free(client->syncpts[0]);
-        host1x_channel_free(vic->channel);
+        host1x_channel_put(vic->channel);
 
         if (vic->domain) {
                 iommu_detach_device(vic->domain, vic->dev);
diff --git a/drivers/gpu/host1x/channel.c b/drivers/gpu/host1x/channel.c
index 8f437d924c10..db9b91d1384c 100644
--- a/drivers/gpu/host1x/channel.c
+++ b/drivers/gpu/host1x/channel.c
@@ -24,19 +24,33 @@
 #include "job.h"
 
 /* Constructor for the host1x device list */
-int host1x_channel_list_init(struct host1x *host)
+int host1x_channel_list_init(struct host1x_channel_list *chlist,
+                             unsigned int num_channels)
 {
-        INIT_LIST_HEAD(&host->chlist.list);
-        mutex_init(&host->chlist_mutex);
-
-        if (host->info->nb_channels > BITS_PER_LONG) {
-                WARN(1, "host1x hardware has more channels than supported by the driver\n");
-                return -ENOSYS;
+        chlist->channels = kcalloc(num_channels, sizeof(struct host1x_channel),
+                                   GFP_KERNEL);
+        if (!chlist->channels)
+                return -ENOMEM;
+
+        chlist->allocated_channels =
+                kcalloc(BITS_TO_LONGS(num_channels), sizeof(unsigned long),
+                        GFP_KERNEL);
+        if (!chlist->allocated_channels) {
+                kfree(chlist->channels);
+                return -ENOMEM;
         }
 
+        bitmap_zero(chlist->allocated_channels, num_channels);
+
         return 0;
 }
 
+void host1x_channel_list_free(struct host1x_channel_list *chlist)
+{
+        kfree(chlist->allocated_channels);
+        kfree(chlist->channels);
+}
+
 int host1x_job_submit(struct host1x_job *job)
 {
         struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
@@ -47,86 +61,107 @@ EXPORT_SYMBOL(host1x_job_submit);
 
 struct host1x_channel *host1x_channel_get(struct host1x_channel *channel)
 {
-        int err = 0;
+        kref_get(&channel->refcount);
 
-        mutex_lock(&channel->reflock);
+        return channel;
+}
+EXPORT_SYMBOL(host1x_channel_get);
 
-        if (channel->refcount == 0)
-                err = host1x_cdma_init(&channel->cdma);
+/**
+ * host1x_channel_get_index() - Attempt to get channel reference by index
+ * @host: Host1x device object
+ * @index: Index of channel
+ *
+ * If channel number @index is currently allocated, increase its refcount
+ * and return a pointer to it. Otherwise, return NULL.
+ */
+struct host1x_channel *host1x_channel_get_index(struct host1x *host,
+                                                unsigned int index)
+{
+        struct host1x_channel *ch = &host->channel_list.channels[index];
 
-        if (!err)
-                channel->refcount++;
+        if (!kref_get_unless_zero(&ch->refcount))
+                return NULL;
 
-        mutex_unlock(&channel->reflock);
+        return ch;
+}
+
+static void release_channel(struct kref *kref)
+{
+        struct host1x_channel *channel =
+                container_of(kref, struct host1x_channel, refcount);
+        struct host1x *host = dev_get_drvdata(channel->dev->parent);
+        struct host1x_channel_list *chlist = &host->channel_list;
+
+        host1x_hw_cdma_stop(host, &channel->cdma);
+        host1x_cdma_deinit(&channel->cdma);
 
-        return err ? NULL : channel;
+        clear_bit(channel->id, chlist->allocated_channels);
 }
-EXPORT_SYMBOL(host1x_channel_get);
 
 void host1x_channel_put(struct host1x_channel *channel)
 {
-        mutex_lock(&channel->reflock);
+        kref_put(&channel->refcount, release_channel);
+}
+EXPORT_SYMBOL(host1x_channel_put);
 
-        if (channel->refcount == 1) {
-                struct host1x *host = dev_get_drvdata(channel->dev->parent);
+static struct host1x_channel *acquire_unused_channel(struct host1x *host)
+{
+        struct host1x_channel_list *chlist = &host->channel_list;
+        unsigned int max_channels = host->info->nb_channels;
+        unsigned int index;
 
-                host1x_hw_cdma_stop(host, &channel->cdma);
-                host1x_cdma_deinit(&channel->cdma);
+        index = find_first_zero_bit(chlist->allocated_channels, max_channels);
+        if (index >= max_channels) {
+                dev_err(host->dev, "failed to find free channel\n");
+                return NULL;
         }
 
-        channel->refcount--;
+        chlist->channels[index].id = index;
 
-        mutex_unlock(&channel->reflock);
+        set_bit(index, chlist->allocated_channels);
+
+        return &chlist->channels[index];
 }
-EXPORT_SYMBOL(host1x_channel_put);
 
+/**
+ * host1x_channel_request() - Allocate a channel
+ * @device: Host1x unit this channel will be used to send commands to
+ *
+ * Allocates a new host1x channel for @device. If there are no free channels,
+ * this will sleep until one becomes available. May return NULL if CDMA
+ * initialization fails.
+ */
 struct host1x_channel *host1x_channel_request(struct device *dev)
 {
         struct host1x *host = dev_get_drvdata(dev->parent);
-        unsigned int max_channels = host->info->nb_channels;
-        struct host1x_channel *channel = NULL;
-        unsigned long index;
+        struct host1x_channel_list *chlist = &host->channel_list;
+        struct host1x_channel *channel;
         int err;
 
-        mutex_lock(&host->chlist_mutex);
+        channel = acquire_unused_channel(host);
+        if (!channel)
+                return NULL;
 
-        index = find_first_zero_bit(&host->allocated_channels, max_channels);
-        if (index >= max_channels)
-                goto fail;
+        kref_init(&channel->refcount);
+        mutex_init(&channel->submitlock);
+        channel->dev = dev;
 
-        channel = kzalloc(sizeof(*channel), GFP_KERNEL);
-        if (!channel)
+        err = host1x_hw_channel_init(host, channel, channel->id);
+        if (err < 0)
                 goto fail;
 
-        err = host1x_hw_channel_init(host, channel, index);
+        err = host1x_cdma_init(&channel->cdma);
         if (err < 0)
                 goto fail;
 
-        /* Link device to host1x_channel */
-        channel->dev = dev;
-
-        /* Add to channel list */
-        list_add_tail(&channel->list, &host->chlist.list);
-
-        host->allocated_channels |= BIT(index);
-
-        mutex_unlock(&host->chlist_mutex);
         return channel;
 
 fail:
-        dev_err(dev, "failed to init channel\n");
-        kfree(channel);
-        mutex_unlock(&host->chlist_mutex);
-        return NULL;
-}
-EXPORT_SYMBOL(host1x_channel_request);
+        clear_bit(channel->id, chlist->allocated_channels);
 
-void host1x_channel_free(struct host1x_channel *channel)
-{
-        struct host1x *host = dev_get_drvdata(channel->dev->parent);
+        dev_err(dev, "failed to initialize channel\n");
 
-        host->allocated_channels &= ~BIT(channel->id);
-        list_del(&channel->list);
-        kfree(channel);
+        return NULL;
 }
-EXPORT_SYMBOL(host1x_channel_free);
+EXPORT_SYMBOL(host1x_channel_request);
diff --git a/drivers/gpu/host1x/channel.h b/drivers/gpu/host1x/channel.h
index df767cf90d51..7068e42d42df 100644
--- a/drivers/gpu/host1x/channel.h
+++ b/drivers/gpu/host1x/channel.h
@@ -20,17 +20,21 @@
 #define __HOST1X_CHANNEL_H
 
 #include <linux/io.h>
+#include <linux/kref.h>
 
 #include "cdma.h"
 
 struct host1x;
+struct host1x_channel;
 
-struct host1x_channel {
-        struct list_head list;
+struct host1x_channel_list {
+        struct host1x_channel *channels;
+        unsigned long *allocated_channels;
+};
 
-        unsigned int refcount;
+struct host1x_channel {
+        struct kref refcount;
         unsigned int id;
-        struct mutex reflock;
         struct mutex submitlock;
         void __iomem *regs;
         struct device *dev;
@@ -38,9 +42,10 @@ struct host1x_channel {
 };
 
 /* channel list operations */
-int host1x_channel_list_init(struct host1x *host);
-
-#define host1x_for_each_channel(host, channel)                          \
-        list_for_each_entry(channel, &host->chlist.list, list)
+int host1x_channel_list_init(struct host1x_channel_list *chlist,
+                             unsigned int num_channels);
+void host1x_channel_list_free(struct host1x_channel_list *chlist);
+struct host1x_channel *host1x_channel_get_index(struct host1x *host,
+                                                unsigned int index);
 
 #endif
diff --git a/drivers/gpu/host1x/debug.c b/drivers/gpu/host1x/debug.c
index d9330fcc62ad..2aae0e63214c 100644
--- a/drivers/gpu/host1x/debug.c
+++ b/drivers/gpu/host1x/debug.c
@@ -43,24 +43,19 @@ void host1x_debug_output(struct output *o, const char *fmt, ...)
         o->fn(o->ctx, o->buf, len);
 }
 
-static int show_channels(struct host1x_channel *ch, void *data, bool show_fifo)
+static int show_channel(struct host1x_channel *ch, void *data, bool show_fifo)
 {
         struct host1x *m = dev_get_drvdata(ch->dev->parent);
         struct output *o = data;
 
-        mutex_lock(&ch->reflock);
+        mutex_lock(&ch->cdma.lock);
 
-        if (ch->refcount) {
-                mutex_lock(&ch->cdma.lock);
+        if (show_fifo)
+                host1x_hw_show_channel_fifo(m, ch, o);
 
-                if (show_fifo)
-                        host1x_hw_show_channel_fifo(m, ch, o);
+        host1x_hw_show_channel_cdma(m, ch, o);
 
-                host1x_hw_show_channel_cdma(m, ch, o);
-                mutex_unlock(&ch->cdma.lock);
-        }
-
-        mutex_unlock(&ch->reflock);
+        mutex_unlock(&ch->cdma.lock);
 
         return 0;
 }
@@ -94,28 +89,22 @@ static void show_syncpts(struct host1x *m, struct output *o)
         host1x_debug_output(o, "\n");
 }
 
-static void show_all(struct host1x *m, struct output *o)
+static void show_all(struct host1x *m, struct output *o, bool show_fifo)
 {
-        struct host1x_channel *ch;
+        int i;
 
         host1x_hw_show_mlocks(m, o);
         show_syncpts(m, o);
         host1x_debug_output(o, "---- channels ----\n");
 
-        host1x_for_each_channel(m, ch)
-                show_channels(ch, o, true);
-}
-
-static void show_all_no_fifo(struct host1x *host1x, struct output *o)
-{
-        struct host1x_channel *ch;
-
-        host1x_hw_show_mlocks(host1x, o);
-        show_syncpts(host1x, o);
-        host1x_debug_output(o, "---- channels ----\n");
+        for (i = 0; i < m->info->nb_channels; ++i) {
+                struct host1x_channel *ch = host1x_channel_get_index(m, i);
 
-        host1x_for_each_channel(host1x, ch)
-                show_channels(ch, o, false);
+                if (ch) {
+                        show_channel(ch, o, show_fifo);
+                        host1x_channel_put(ch);
+                }
+        }
 }
 
 static int host1x_debug_show_all(struct seq_file *s, void *unused)
@@ -125,7 +114,7 @@ static int host1x_debug_show_all(struct seq_file *s, void *unused)
                 .ctx = s
         };
 
-        show_all(s->private, &o);
+        show_all(s->private, &o, true);
 
         return 0;
 }
@@ -137,7 +126,7 @@ static int host1x_debug_show(struct seq_file *s, void *unused)
                 .ctx = s
         };
 
-        show_all_no_fifo(s->private, &o);
+        show_all(s->private, &o, false);
 
         return 0;
 }
@@ -216,7 +205,7 @@ void host1x_debug_dump(struct host1x *host1x)
                 .fn = write_to_printk
         };
 
-        show_all(host1x, &o);
+        show_all(host1x, &o, true);
 }
 
 void host1x_debug_dump_syncpts(struct host1x *host1x)
diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
index f05ebb14fa63..5c1c711a21af 100644
--- a/drivers/gpu/host1x/dev.c
+++ b/drivers/gpu/host1x/dev.c
@@ -198,7 +198,8 @@ static int host1x_probe(struct platform_device *pdev)
                 host->iova_end = geometry->aperture_end;
         }
 
-        err = host1x_channel_list_init(host);
+        err = host1x_channel_list_init(&host->channel_list,
+                                       host->info->nb_channels);
         if (err) {
                 dev_err(&pdev->dev, "failed to initialize channel list\n");
                 goto fail_detach_device;
@@ -207,7 +208,7 @@ static int host1x_probe(struct platform_device *pdev)
         err = clk_prepare_enable(host->clk);
         if (err < 0) {
                 dev_err(&pdev->dev, "failed to enable clock\n");
-                goto fail_detach_device;
+                goto fail_free_channels;
         }
 
         err = reset_control_deassert(host->rst);
@@ -244,6 +245,8 @@ fail_reset_assert:
         reset_control_assert(host->rst);
 fail_unprepare_disable:
         clk_disable_unprepare(host->clk);
+fail_free_channels:
+        host1x_channel_list_free(&host->channel_list);
 fail_detach_device:
         if (host->domain) {
                 put_iova_domain(&host->iova);
diff --git a/drivers/gpu/host1x/dev.h b/drivers/gpu/host1x/dev.h
index 229d08b6a45e..ffdbc15b749b 100644
--- a/drivers/gpu/host1x/dev.h
+++ b/drivers/gpu/host1x/dev.h
@@ -129,10 +129,8 @@ struct host1x {
         struct host1x_syncpt *nop_sp;
 
         struct mutex syncpt_mutex;
-        struct mutex chlist_mutex;
-        struct host1x_channel chlist;
-        unsigned long allocated_channels;
-        unsigned int num_allocated_channels;
+
+        struct host1x_channel_list channel_list;
 
         struct dentry *debugfs;
 
diff --git a/drivers/gpu/host1x/hw/channel_hw.c b/drivers/gpu/host1x/hw/channel_hw.c
index 5e8df78b7acd..8447a56c41ca 100644
--- a/drivers/gpu/host1x/hw/channel_hw.c
+++ b/drivers/gpu/host1x/hw/channel_hw.c
@@ -181,10 +181,6 @@ error:
 static int host1x_channel_init(struct host1x_channel *ch, struct host1x *dev,
                                unsigned int index)
 {
-        ch->id = index;
-        mutex_init(&ch->reflock);
-        mutex_init(&ch->submitlock);
-
         ch->regs = dev->regs + index * HOST1X_CHANNEL_SIZE;
         return 0;
 }
diff --git a/include/linux/host1x.h b/include/linux/host1x.h
index 476da0e06bb2..630b1a98ab58 100644
--- a/include/linux/host1x.h
+++ b/include/linux/host1x.h
@@ -172,7 +172,6 @@ struct host1x_channel;
 struct host1x_job;
 
 struct host1x_channel *host1x_channel_request(struct device *dev);
-void host1x_channel_free(struct host1x_channel *channel);
 struct host1x_channel *host1x_channel_get(struct host1x_channel *channel);
 void host1x_channel_put(struct host1x_channel *channel);
 int host1x_job_submit(struct host1x_job *job);