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drm/etnaviv: add 'sync point' support

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In order to support performance counters in a sane way we need to provide
a method to sync the GPU with the CPU. The GPU can process multpile command
buffers/events per irq. With the help of a 'sync point' we can trigger an event
and stop the GPU/FE immediately. When the CPU is done with is processing it
simply needs to restart the FE and the GPU will process the command stream.

Changes from v1 -> v2:
- process sync point with a work item to keep irq as fast as possible

Changes from v4 -> v5:
- renamed pmrs_* to sync_point_*
- call event_free(..) in sync_point_worker(..)

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 15:15:28 +02:00
committed by Lucas Stach
parent 249300c740
commit 357713ce9b
4 changed files with 69 additions and 0 deletions
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26
drivers/gpu/drm/etnaviv/etnaviv_gpu.c
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@@ -25,6 +25,7 @@
#include "etnaviv_gpu.h"
#include "etnaviv_gem.h"
#include "etnaviv_mmu.h"
#include "etnaviv_perfmon.h"
#include "common.xml.h"
#include "state.xml.h"
#include "state_hi.xml.h"
@@ -1364,6 +1365,7 @@ int etnaviv_gpu_submit(struct etnaviv_gpu *gpu,
}
gpu->event[event].fence = fence;
gpu->event[event].sync_point = NULL;
submit->fence = dma_fence_get(fence);
gpu->active_fence = submit->fence->seqno;
@@ -1409,6 +1411,24 @@ out_pm_put:
return ret;
}
static void etnaviv_process_sync_point(struct etnaviv_gpu *gpu,
struct etnaviv_event *event)
{
u32 addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
event->sync_point(gpu, event);
etnaviv_gpu_start_fe(gpu, addr + 2, 2);
}
static void sync_point_worker(struct work_struct *work)
{
struct etnaviv_gpu *gpu = container_of(work, struct etnaviv_gpu,
sync_point_work);
etnaviv_process_sync_point(gpu, &gpu->event[gpu->sync_point_event]);
event_free(gpu, gpu->sync_point_event);
}
/*
* Init/Cleanup:
*/
@@ -1455,6 +1475,11 @@ static irqreturn_t irq_handler(int irq, void *data)
dev_dbg(gpu->dev, "event %u\n", event);
if (gpu->event[event].sync_point) {
gpu->sync_point_event = event;
etnaviv_queue_work(gpu->drm, &gpu->sync_point_work);
}
fence = gpu->event[event].fence;
gpu->event[event].fence = NULL;
dma_fence_signal(fence);
@@ -1660,6 +1685,7 @@ static int etnaviv_gpu_bind(struct device *dev, struct device *master,
INIT_LIST_HEAD(&gpu->active_cmd_list);
INIT_WORK(&gpu->retire_work, retire_worker);
INIT_WORK(&gpu->sync_point_work, sync_point_worker);
INIT_WORK(&gpu->recover_work, recover_worker);
init_waitqueue_head(&gpu->fence_event);