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drm/etnaviv: make it possible to allocate multiple events 

This makes it possible to allocate multiple events under the event
spinlock. This change is needed to support 'sync'-points.

Changes v2 -> v3:
- wait for the completion of all events
- use 10sec timeout regardless of the number of events
- removed validation if there are enough free events
- fixed return value evaluation of event_alloc(..) in etnaviv_gpu_submit(..)

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
This commit is contained in:
Christian Gmeiner 2017-09-24 15:15:20 +02:00 committed by Lucas Stach
parent 355502e03a
commit 95a428c172
1 changed files with 31 additions and 16 deletions
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47
drivers/gpu/drm/etnaviv/etnaviv_gpu.c
View File

@ -1142,28 +1142,44 @@ int etnaviv_gpu_fence_sync_obj(struct etnaviv_gem_object *etnaviv_obj,
* event management:
*/
static unsigned int event_alloc(struct etnaviv_gpu *gpu)
static int event_alloc(struct etnaviv_gpu *gpu, unsigned nr_events,
unsigned int *events)
{
unsigned long ret, flags;
unsigned int event;
unsigned long flags, timeout = msecs_to_jiffies(10 * 10000);
unsigned i, acquired = 0;
ret = wait_for_completion_timeout(&gpu->event_free,
msecs_to_jiffies(10 * 10000));
if (!ret)
dev_err(gpu->dev, "wait_for_completion_timeout failed");
for (i = 0; i < nr_events; i++) {
unsigned long ret;
ret = wait_for_completion_timeout(&gpu->event_free, timeout);
if (!ret) {
dev_err(gpu->dev, "wait_for_completion_timeout failed");
goto out;
}
acquired++;
timeout = ret;
}
spin_lock_irqsave(&gpu->event_spinlock, flags);
/* find first free event */
event = find_first_zero_bit(gpu->event_bitmap, ETNA_NR_EVENTS);
if (event < ETNA_NR_EVENTS)
for (i = 0; i < nr_events; i++) {
int event = find_first_zero_bit(gpu->event_bitmap, ETNA_NR_EVENTS);
events[i] = event;
set_bit(event, gpu->event_bitmap);
else
event = ~0U;
}
spin_unlock_irqrestore(&gpu->event_spinlock, flags);
return event;
return 0;
out:
for (i = 0; i < acquired; i++)
complete(&gpu->event_free);
return -EBUSY;
}
static void event_free(struct etnaviv_gpu *gpu, unsigned int event)
@ -1332,10 +1348,9 @@ int etnaviv_gpu_submit(struct etnaviv_gpu *gpu,
*
*/
event = event_alloc(gpu);
if (unlikely(event == ~0U)) {
ret = event_alloc(gpu, 1, &event);
if (ret) {
DRM_ERROR("no free event\n");
ret = -EBUSY;
goto out_pm_put;
}