xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

drm/etnaviv: add 'sync point' support

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

36
drivers/gpu/drm/etnaviv/etnaviv_buffer.c
View File

@@ -250,6 +250,42 @@ void etnaviv_buffer_end(struct etnaviv_gpu *gpu)
}
}
/* Append a 'sync point' to the ring buffer. */
void etnaviv_sync_point_queue(struct etnaviv_gpu *gpu, unsigned int event)
{
struct etnaviv_cmdbuf *buffer = gpu->buffer;
unsigned int waitlink_offset = buffer->user_size - 16;
u32 dwords, target;
/*
* We need at most 3 dwords in the return target:
* 1 event + 1 end + 1 wait + 1 link.
*/
dwords = 4;
target = etnaviv_buffer_reserve(gpu, buffer, dwords);
/* Signal sync point event */
CMD_LOAD_STATE(buffer, VIVS_GL_EVENT, VIVS_GL_EVENT_EVENT_ID(event) |
VIVS_GL_EVENT_FROM_PE);
/* Stop the FE to 'pause' the GPU */
CMD_END(buffer);
/* Append waitlink */
CMD_WAIT(buffer);
CMD_LINK(buffer, 2, etnaviv_cmdbuf_get_va(buffer) +
buffer->user_size - 4);
/*
* Kick off the 'sync point' command by replacing the previous
* WAIT with a link to the address in the ring buffer.
*/
etnaviv_buffer_replace_wait(buffer, waitlink_offset,
VIV_FE_LINK_HEADER_OP_LINK |
VIV_FE_LINK_HEADER_PREFETCH(dwords),
target);
}
/* Append a command buffer to the ring buffer. */
void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, unsigned int event,
struct etnaviv_cmdbuf *cmdbuf)