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sna: Close each client op with an arbitrartion check 

Minimise preemption latency by frequently checking for pending preemption
events in between X11 client requests.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2019-11-02 19:19:20 +00:00
parent bff5eca49b
commit b5ac286c9b
3 changed files with 6 additions and 0 deletions
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2
src/sna/sna_accel.c
View File

@ -5302,6 +5302,8 @@ inline static void blt_done(struct sna *sna)
DBG(("%s: flushing BLT operation on empty ring\n",
__FUNCTION__));
_kgem_submit(&sna->kgem);
} else {
sna->kgem.batch[sna->kgem.nbatch++] = MI_ARB_CHECK;
}
}

1
src/sna/sna_reg.h
View File

@ -14,6 +14,7 @@
/* broadwater flush bits */
#define BRW_MI_GLOBAL_SNAPSHOT_RESET (1 << 3)
#define MI_ARB_CHECK (0x5 << 23)
#define MI_BATCH_BUFFER_END (0xA << 23)
/* Noop */

3
src/sna/sna_render.c
View File

@ -32,6 +32,7 @@
#include "sna.h"
#include "sna_render.h"
#include "sna_render_inline.h"
#include "sna_reg.h"
#include "fb/fbpict.h"
#define NO_REDIRECT 0
@ -2129,6 +2130,8 @@ sna_render_composite_redirect_done(struct sna *sna,
kgem_bo_destroy(&sna->kgem, op->dst.bo);
}
batch_emit(sna, MI_ARB_CHECK);
}
static bool