This aligns the gfx, compute, and dma IBs to 8 DW boundries. This aligns the the IB to the fetch size of the CP for optimal performance. Additionally, r6xx hardware requires at least 4 DW alignment to avoid a hw bug. This also aligns the DMA IBs to 8 DW which is required for the DMA engine. This alignment is already handled in the gallium driver, but that patch can be removed not that it's done in the winsys.
Signed-off-by: Alex Deucher <[email protected]> --- src/gallium/winsys/radeon/drm/radeon_drm_cs.c | 30 +++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/src/gallium/winsys/radeon/drm/radeon_drm_cs.c b/src/gallium/winsys/radeon/drm/radeon_drm_cs.c index 8c91906..e4128bc 100644 --- a/src/gallium/winsys/radeon/drm/radeon_drm_cs.c +++ b/src/gallium/winsys/radeon/drm/radeon_drm_cs.c @@ -470,6 +470,36 @@ static void radeon_drm_cs_flush(struct radeon_winsys_cs *rcs, unsigned flags, ui struct radeon_drm_cs *cs = radeon_drm_cs(rcs); struct radeon_cs_context *tmp; + switch (cs->base.ring_type) { + case RING_DMA: + /* pad DMA ring to 8 DWs */ + if (cs->ws->info.chip_class <= SI) { + while (rcs->cdw & 7) + OUT_CS(&cs->base, 0xf0000000); /* NOP packet */ + } else { + while (rcs->cdw & 7) + OUT_CS(&cs->base, 0x00000000); /* NOP packet */ + } + break; + case RING_GFX: + /* pad DMA ring to 8 DWs to meet CP fetch alignment requirements + * r6xx, requires at least 4 dw alignment to avoid a hw bug. + */ + if (flags & RADEON_FLUSH_COMPUTE) { + if (cs->ws->info.chip_class <= SI) { + while (rcs->cdw & 7) + OUT_CS(&cs->base, 0x80000000); /* type2 nop packet */ + } else { + while (rcs->cdw & 7) + OUT_CS(&cs->base, 0xffff1000); /* type3 nop packet */ + } + } else { + while (rcs->cdw & 7) + OUT_CS(&cs->base, 0x80000000); /* type2 nop packet */ + } + break; + } + if (rcs->cdw > RADEON_MAX_CMDBUF_DWORDS) { fprintf(stderr, "radeon: command stream overflowed\n"); } -- 1.8.3.1 _______________________________________________ mesa-dev mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/mesa-dev
